WO2013141344A1 - Wireless terminal device, wireless base station device, communication control device, management device, communication control method, and communication control program - Google Patents

Wireless terminal device, wireless base station device, communication control device, management device, communication control method, and communication control program Download PDF

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Publication number
WO2013141344A1
WO2013141344A1 PCT/JP2013/058237 JP2013058237W WO2013141344A1 WO 2013141344 A1 WO2013141344 A1 WO 2013141344A1 JP 2013058237 W JP2013058237 W JP 2013058237W WO 2013141344 A1 WO2013141344 A1 WO 2013141344A1
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WIPO (PCT)
Prior art keywords
base station
wireless terminal
terminal device
radio
wireless
Prior art date
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PCT/JP2013/058237
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French (fr)
Japanese (ja)
Inventor
剛史 山本
Original Assignee
住友電気工業株式会社
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Publication date
Priority claimed from JP2012068396A external-priority patent/JP2013201586A/en
Priority claimed from JP2012068395A external-priority patent/JP2013201585A/en
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Publication of WO2013141344A1 publication Critical patent/WO2013141344A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837Determination of triggering parameters for hand-off
    • H04W36/008375Determination of triggering parameters for hand-off based on historical data

Definitions

  • the present invention relates to a radio terminal apparatus, a radio base station apparatus, a communication control apparatus, a management apparatus, a communication control method, and a communication control program, and in particular, can communicate with a plurality of radio base station apparatuses when the radio terminal apparatus performs a moving operation.
  • the present invention relates to a wireless terminal device, a wireless base station device, a communication control device, a management device, a communication control method, and a communication control program in a simple communication system.
  • a communication service is provided by a radio base station apparatus (hereinafter also referred to as a macro base station) that forms an area in which a cell having a radius of several hundred meters to several tens of kilometers, that is, a radio terminal apparatus can communicate. It was.
  • a radio base station apparatus hereinafter also referred to as a macro base station
  • Femto base stations and pico base stations have been developed as a kind of small base stations. Since the femto cell formed by the femto base station has a small radius of around 10 meters, the femto base station is outside the range of the macro cell formed by the macro base station and it is difficult to install the macro base station. It can also be used in places such as underground malls.
  • femto base stations since many femto base stations are installed in a specific area, it is difficult to connect the femto base stations directly to the core network. For this reason, it is conceivable that a large number of femto base stations installed in a specific area are once connected to a gateway device such as a HeNB-GW, and the femto base station and the core network are connected via the HeNB-GW.
  • a gateway device such as a HeNB-GW
  • the pico base station is developed based on a macro base station, and forms, for example, a pico cell having a radius of 100 to 200 meters.
  • Heterogeneous Network which is a communication system in which femto base stations, pico base stations, and macro base stations are mixed, a plurality of femto cells or pico cells are formed in a macro cell, for example. For this reason, the handover operation of the wireless terminal device is likely to occur, and the situation of performing the handover operation is complicated, so that an inappropriate handover operation such as the timing of the handover operation being too early or too late may occur.
  • 3GPP Three Generation Partnership Project
  • Non-Patent Document 1 When an inappropriate handover operation as described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system. A technique for suppressing such an inappropriate handover operation and constructing a good communication system is desired.
  • the objective is a radio base station apparatus which can aim at stabilization of communication by controlling the movement operation of a radio
  • a wireless base station device, a communication control device, a management device, a communication control method, and a communication control program are provided.
  • a radio terminal apparatus is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a mobile operation, A counting unit for counting the number of executions of the moving operation of the device, and a movement state estimating unit for estimating the moving state of the wireless terminal device based on the number of executions counted by the counting unit. And the counting unit performs the counting in accordance with a counting standard acquired from the radio base station apparatus.
  • counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
  • the moving operation is, for example, a handover operation or a cell reselection operation.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • the counting unit weights the performed movement operation of its own wireless terminal device according to the counting standard, and performs the counting using the weighted value.
  • a radio terminal apparatus is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, A counting unit for counting the number of executions of the moving operation of the device, and a movement state estimating unit for estimating the moving state of the wireless terminal device based on the number of executions counted by the counting unit.
  • the counting unit weights the performed movement operation of its own wireless terminal device according to a predetermined count standard, and performs the counting using the weighted value.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • the counting unit performs the moving operation that satisfies the predetermined condition as a target of the counting.
  • the counting unit acquires a count reference included in a handover command received from a handover source radio base station apparatus in a handover operation of the own radio terminal apparatus.
  • the radio terminal when the number of radio terminal apparatuses located in the cell formed by the radio base station apparatus is particularly small, the radio terminal is more likely to transmit than the count reference is repeatedly transmitted by broadcast information. The count reference can be notified to the apparatus efficiently.
  • the wireless terminal device further includes the wireless terminal device involved in the determination of execution of the moving operation of the wireless terminal device based on the movement state estimated by the movement state estimation unit.
  • a setting unit for performing setting is provided.
  • the wireless terminal device further includes a notification unit for notifying the wireless base station device of the movement state estimated by the movement state estimation unit.
  • the movement operation of the radio terminal apparatus is performed at an appropriate timing by using the movement state notified by the radio terminal apparatus. Generation of a moving operation can be suppressed.
  • the setting unit performs setting related to the operation of the own wireless terminal device related to execution determination of the handover operation of the own wireless terminal device based on the movement state.
  • the timing of the handover operation can be optimized and the occurrence of an inappropriate handover operation can be suppressed.
  • the counting unit determines whether or not the predetermined condition is satisfied based on information acquired from the radio base station apparatus.
  • wireless terminal apparatus can reflect the said movement operation
  • the wireless terminal device further moves the source or destination of the moving operation based on transmission power of a radio signal transmitted from the source or destination wireless base station device in the moving operation.
  • a base station type determining unit for determining a type of the radio base station apparatus, wherein the counting unit determines whether the moving operation is to be counted based on a determination result of the base station type determining unit; Judging.
  • the counting unit has a predetermined residence time from the time when the wireless terminal device moves to the wireless base station device to the time when the moving operation to another wireless base station device is performed. If it is less than the threshold value, the moving operation is excluded from the count target.
  • the counting unit excludes the moving operation from the object of counting when a moving operation from another wireless base station device to the small base station is performed.
  • the counting unit excludes the moving operation from the object of counting when the moving operation of the own wireless terminal device from the small base station to another wireless base station device is performed.
  • the appropriate movement operation is selected as the count target, and the own movement state is appropriately estimated. be able to.
  • the counting unit performs a movement operation from the macro base station of the own radio terminal device to another radio base station device or a movement operation from another radio base station device to the macro base station.
  • the moving operation is the target of the counting.
  • a radio terminal apparatus is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, A counting unit for counting the number of executions of the handover operation of the device, a movement state estimation unit for estimating the movement state of its own wireless terminal device based on the number of executions counted by the counting unit, Based on the movement state estimated by the movement state estimation unit, a setting unit for setting a value of TTT (Time to Trigger), and a reception power of a radio signal transmitted from the radio base station device are measured.
  • TTT Time to Trigger
  • a measurement report indicating the measurement result is transmitted to the wireless communication destination.
  • a received power report unit for transmission to Chikyoku device the counting unit performs the count according to the count criteria acquired from the radio base station apparatus.
  • counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
  • a radio terminal apparatus is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, A counting unit for counting the number of executions of the handover operation of the device, a movement state estimation unit for estimating the movement state of its own wireless terminal device based on the number of executions counted by the counting unit, Based on the movement state estimated by the movement state estimation unit, a setting unit for setting a value of TTT and a reception power of a radio signal transmitted from the radio base station device are measured, and a measurement result is the above When a predetermined condition is continuously satisfied for the time indicated by TTT, a measurement report indicating the measurement result is transmitted to the radio base station apparatus of the communication connection destination And a order received power reporting section, the counting unit, the handover operation of the own wireless terminal device executes weighted according to a predetermined count basis, it performs the counting using a weighted value.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
  • a communication control apparatus is capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, and executing the moving operation according to a count criterion.
  • a count reference creation unit for creating the count reference For a wireless terminal device that counts the number of times, a count reference creation unit for creating the count reference, and a count reference notification unit for notifying other devices of the count reference created by the count reference creation unit Prepare.
  • the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
  • the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. Can be planned.
  • the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
  • the count reference creation unit weights each of the radio base station devices, and the count reference notification unit notifies the weighting result of the count reference creation unit as the count reference.
  • the count reference notification unit notifies the radio base station apparatus of the weighting result by the count reference creation unit.
  • the communication control device A weighting result according to the density of the number of installed base station apparatuses can be transmitted to the radio base station apparatus and the other radio base station apparatuses.
  • the radio base station apparatus can cause the radio terminal apparatus to appropriately estimate the movement state based on the weighting result, so that the movement operation of the radio terminal apparatus can be optimized over a wide area. Can do.
  • a radio base station apparatus includes the communication control apparatus according to (17).
  • each radio base station apparatus can create a count reference and notify the count reference in the wireless communication system, so the processing load of the count reference creating process and the count reference notification is distributed. Can be made.
  • a management apparatus manages the radio base station apparatus and includes the communication control apparatus according to (17).
  • the creation of the count reference and the notification of the count reference in the wireless communication system can be performed collectively in the management apparatus, so that the creation process of the count reference and the notification of the count reference can be performed more efficiently. Can be done.
  • a communication control method is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a mobile operation, Including the step of counting the number of executions of the moving operation and the step of estimating the movement state of the own wireless terminal device based on the counted number of executions, and in the step of counting, from the radio base station device The count is performed in accordance with the acquired count standard.
  • counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • a communication control method is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a moving operation.
  • the moving operation of the terminal device is weighted according to a predetermined count standard, and the count is performed using the weighted value.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • a communication control method is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, and the radio control apparatus of the present invention
  • a step of counting the number of executions of the handover operation a step of estimating a movement state of the wireless terminal device based on the counted number of executions, and setting a TTT value based on the estimated movement state Measuring a reception power of a radio signal transmitted from the radio base station apparatus, and communicating a measurement report indicating the measurement result when the measurement result satisfies a predetermined condition continuously for a time indicated by the TTT.
  • the radio base station apparatus transmitting to the connection-destination radio base station apparatus, and in the counting step, the radio base station apparatus It performs the count according al acquired count criteria.
  • counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
  • a communication control method is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation.
  • a step of counting the number of executions of the handover operation a step of estimating a movement state of the wireless terminal device based on the counted number of executions, and setting a TTT value based on the estimated movement state Measuring a reception power of a radio signal transmitted from the radio base station apparatus, and communicating a measurement report indicating the measurement result when the measurement result satisfies a predetermined condition continuously for a time indicated by the TTT.
  • the handover operation of a terminal apparatus is weighted according to a predetermined count basis, performs the counting using a weighted value.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
  • a communication control method is a communication control method in a communication control apparatus, which is capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, and is a counting reference.
  • the step of creating the count reference and the step of notifying the other device of the created count reference are included.
  • the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
  • the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. You can plan.
  • the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
  • a communication control program is a communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation.
  • the counting is performed according to the counting standard acquired from the radio base station apparatus.
  • counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • a communication control program is a communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation.
  • the above-mentioned movement operation of the own wireless terminal device is weighted according to a predetermined count standard, and the above-mentioned counting is performed using the weighted value.
  • the wireless terminal device can appropriately estimate its own movement state.
  • the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation
  • a communication control program is a communication control program used in the communication control apparatus, and can communicate with a plurality of radio base station apparatuses by performing a moving operation on the computer.
  • a program for executing a step of creating the count reference and a step of notifying another device of the created count reference for a wireless terminal device that counts the number of executions of the moving operation according to the count reference is there.
  • the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
  • the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. You can plan.
  • the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
  • communication can be stabilized by appropriately controlling the movement operation of the wireless terminal device.
  • FIG. 10 is a diagram illustrating an event A3 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention.
  • event A4 in which a radio
  • FIG. 10 is a diagram illustrating an event A5 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a diagram for explaining another example of parameters for controlling the timing of the handover operation in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when a wireless terminal device in an idle state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention.
  • 6 is a flowchart defining an operation procedure when a wireless terminal apparatus in a connection established state performs timing adjustment of a handover operation in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when an idle wireless terminal apparatus performs timing adjustment of a cell reselection operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 5 is a flowchart defining an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when a radio base station apparatus notifies a count reference to a radio terminal apparatus in the radio communication system according to the embodiment of the present invention.
  • FIG. 11 is a flowchart defining another example of an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of a count reference in the radio communication system according to the embodiment of the present invention.
  • FIG. 11 is a flowchart defining another example of an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of a count reference in the radio communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation
  • FIG. 10 is a sequence diagram illustrating an example of a movement state update operation performed by the wireless terminal device after completion of the cell reselection operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a sequence diagram showing an example of a movement state update operation performed by the wireless terminal device after completion of the handover operation in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when a wireless terminal device performs a movement state detection process and a setting process according to the movement state in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when a wireless terminal device performs a movement state detection process and a notification process to the wireless base station apparatus of the movement state in the wireless communication system according to the embodiment of the present invention.
  • 5 is a flowchart defining an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • the radio base station apparatus notifies the radio terminal apparatus of information about the cell and the neighboring cell that it forms, that is, the frequency of the radio signal and the ID (identification) of the neighboring cell.
  • the wireless terminal device detects and measures neighboring cells based on information notified from the wireless base station device.
  • the wireless terminal device starts moving to the neighboring cell based on the measurement result.
  • “movement” of the wireless terminal device means cell reselection in addition to handover.
  • Handover means that the communication connection destination of a wireless terminal device in a state where communication connection with a certain radio base station device is established (hereinafter referred to as connection establishment state) is switched to another radio base station device.
  • 3GPP TS 36 .304 applies.
  • the handover operation is performed by the radio base station apparatus that is the communication connection destination of the radio terminal apparatus.
  • cell reselection is performed under the initiative of the radio terminal device, and is usually executed without a specific instruction from the radio base station device to the radio terminal device.
  • the “idle state” of a wireless terminal device is a state in which a certain wireless base station device has selected a wireless terminal device as a communication partner and is not communicating with the wireless base station device.
  • the “state in which communication is not performed” is a state in which an operation for transmitting some information to the radio base station apparatus is not performed.
  • the destination of the wireless terminal device is determined by the wireless base station device or the higher-level device in the core network. For example, when the wireless terminal device is not communicating with the wireless base station device, the wireless terminal device determines the destination of the wireless terminal device.
  • the wireless terminal device is located in a cell means that the wireless terminal device selects a wireless base station device forming the cell as a communication destination and can communicate with the wireless base station device. This means that communication is in progress.
  • it means a state in which a higher-level device of the radio base station apparatus registers that the radio terminal apparatus has moved to a new cell, that is, the radio base station apparatus.
  • “located” includes a state in which a higher-level device has registered the update of the tracking area to which the wireless terminal device belongs.
  • the wireless terminal device executes a tracking area update process.
  • a femto base station is a customer premises apparatus that connects a wireless terminal device connected via a wireless interface to a mobile communication carrier network using an IP backhaul.
  • the femto base station in the closed access mode provides a service only to the related CSG (Closed Subscriber Group) members.
  • the hybrid mode femto base station also provides services to the associated CSG members and CSG non-members.
  • the femto base station in the open access mode operates as a normal base station.
  • Such a 3GPP definition may also be applied to the wireless communication system according to the embodiment of the present invention.
  • the macro base station and the pico base station are radio base station devices that are under the control of the operator and that can communicate with the radio base station device that has contracted with the operator. Further, it is considered that the macro base station and the pico base station are basically not turned off.
  • the femto base station is a radio base station apparatus that is mainly installed in an individual or corporate building and may move or be turned off depending on user circumstances.
  • the femto base station operates in an access mode of open / hybrid / closed.
  • the closed access mode only registered members (terminals) can be connected.
  • the service is provided only to registered members.
  • the hybrid mode the service is provided to both registered members and unregistered members, that is, non-members.
  • the open access mode the same operation as that of the macro base station and the pico base station is performed.
  • FIG. 1 is a diagram showing a configuration of a radio communication system according to an embodiment of the present invention.
  • a radio communication system 401 is a mobile communication system that complies with LTE (Long Term Evolution) standardized by 3GPP, for example, and includes radio base station devices 101A, 101B, and 101C. In FIG. 1, three radio base station apparatuses are representatively shown, but a larger number of radio base station apparatuses may be provided.
  • the wireless communication system 401 further includes an S-GW (Serving Gateway) 161, an MME (Mobility Management Entity) 162, and a P-GW (Packet Data Network Gateway) 163 provided in the core network 301.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • P-GW Packet Data Network Gateway
  • the wireless terminal device 202 establishes a communication connection with a server in the IP network 302 via the wireless base station device 101A, the wireless base station device 101B or the wireless base station device 101C, the S-GW 161, and the P-GW 163, For example, communication data including an IP (Internet Protocol) packet is transmitted and received.
  • IP Internet Protocol
  • the wireless base station devices 101A, 101B, and 101C communicate with the wireless terminal device 202 by transmitting and receiving wireless signals to and from the wireless terminal device 202.
  • the S-GW 161 is connected between the radio base station apparatuses 101A, 101B, and 101C and the IP network 302.
  • the S-GW 161 transmits communication data received from the wireless terminal device 202 via the wireless base station devices 101A, 101B, and 101C to the IP network 302 via the P-GW 163, and from the server in the IP network 302 via the P-GW 163.
  • the communication data received in (1) is transmitted to the wireless terminal device 202 via the wireless base station devices 101A, 101B, 101C.
  • the MME 162 manages the radio base station apparatuses 101A, 101B, 101C, the radio terminal apparatus 202, and the like in the radio communication system 401.
  • the MME 162 transmits and receives control messages to and from the radio base station apparatuses 101A, 101B, and 101C.
  • the radio base station apparatuses 101A, 101B, and 101C transmit and receive communication data to and from the IP network 302 via the S-GW 161 and the P-GW 163.
  • the radio base station apparatuses 101A, 101B, 101C and the S-GW 161 exchange various data with each other via the S1-U interface by transmitting and receiving communication data according to the S1-U interface which is a logical interface.
  • the radio base station apparatuses 101A, 101B, 101C and the MME 162 transmit and receive communication data according to the S1-MME interface, which is a logical interface, to each other via the S1-MME interface, as indicated by dotted lines. Communicate.
  • the MME 162 and the S-GW 161 exchange various data with each other via the S11 interface by transmitting and receiving communication data according to the S11 interface which is a logical interface.
  • the S-GW 161 and the P-GW 163 exchange various data with each other via the S5 interface by transmitting and receiving communication data according to the S5 interface which is a logical interface.
  • FIG. 2 is a diagram illustrating an example of a situation where a mobile operation is performed in the wireless communication system according to the embodiment of the present invention.
  • radio base station apparatuses 101A, 101B, and 101C are, for example, femto base stations, pico base stations, or macro base stations.
  • the wireless base station device 101A can communicate with the wireless terminal device 202 by forming a cell CA and transmitting / receiving a wireless signal to / from the wireless terminal device 202 existing in the cell CA.
  • the radio base station apparatus 101B can communicate with the radio terminal apparatus 202 by forming a cell CB and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CB.
  • the radio base station apparatus 101C can communicate with the radio terminal apparatus 202 by forming a cell CC and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CC.
  • the direction from the wireless terminal device 202 to the core network 301 is referred to as an uplink direction
  • the direction from the core network 301 to the wireless terminal device 202 is referred to as a downlink direction.
  • the radio base station apparatus and the radio terminal apparatus in the radio communication system read and execute a program including each step of the following sequences from a memory (not shown).
  • This program can be installed externally.
  • the installed program is distributed in a state stored in a recording medium, for example.
  • the source radio base station apparatus of the radio terminal apparatus 202 is also referred to as a serving base station
  • the destination radio base station apparatus is also referred to as a target base station.
  • the radio base station apparatus 101A is a serving base station
  • the radio base station apparatus 101B is a target base station
  • power measurement processing is used for determining whether to perform cell reselection.
  • this power measurement processing corresponds to RRC (Radio Resource Control) of the layer 3 stack.
  • the measurement period of the serving cell for cell reselection is described as follows. That is, the radio terminal apparatus 202 measures the RSRP (Reference Signal Received Power) level of the serving cell at least every DRX (Discontinuous Reception) cycle, and determines the S value (Cell Selection Criterion S) defined in TS36.304 and the RSRP level. And compare.
  • RSRP Reference Signal Received Power
  • the wireless terminal device 202 filters the measurement result of the serving cell by at least two measurements. This filtering is considered averaging.
  • At least two measurements out of the set of measurements to be filtered must be performed with an interval of at least a half of the DRX cycle. This is considered to mean that the measurement interval must be 1 ⁇ 2 or more of the DRX cycle.
  • the radio terminal device 202 is designated by the serving base station unless its measurement function is restricted by some restrictions. Start measuring all neighboring cells. That is, if a certain period of time elapses, the wireless terminal device 202 starts measuring neighboring cells even if the S value does not satisfy the condition.
  • RSRQ Reference Signal Signal Quality
  • FIG. 3 is a diagram showing an exemplary sequence of cell reselection operation in the wireless communication system according to the embodiment of the present invention.
  • the wireless terminal device 202 is located in the cell CA and moves to the overlapping area of the cell CA and the cell CB after selecting the wireless base station device 101A as a communication partner.
  • the wireless terminal device 202 is located in the cell CA and moves to the overlapping area of the cell CA and the cell CB after selecting the wireless base station device 101A as a communication partner.
  • wireless terminal apparatus 202 determines to newly select wireless base station apparatus 101A as a communication partner, it receives broadcast information transmitted from wireless base station apparatus 101A (step S1), the content of the received notification information is stored (step S2).
  • This broadcast information includes neighboring cell information and information for performing cell reselection.
  • the wireless terminal device 202 executes an attach process (Attach Procedure) that is a terminal registration process (step S3).
  • the wireless terminal device 202 starts measuring the received power of the wireless signal transmitted from the wireless base station device 101A that is a serving base station. That is, the wireless terminal device 202 measures the reception power of the serving cell. For example, the wireless terminal device 202 measures received power using a pilot signal included in the wireless signal. This measurement cycle is, for example, 0.16 seconds (step S4).
  • the wireless terminal device 202 calculates an S value, which is an evaluation value of the serving cell, and performs S value determination (step S5).
  • the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the neighboring base station indicated by the broadcast information at the frequency indicated by the broadcast information.
  • the peripheral base station indicates a radio base station apparatus 101 other than the serving base station. That is, the radio
  • the wireless terminal device 202 calculates an S value, which is an evaluation value of a neighboring cell, and performs an S value determination (step S7).
  • the wireless terminal apparatus 202 When the S value of the neighboring cell satisfies the predetermined condition (YES in step S7), the wireless terminal apparatus 202 ranks the serving cell and the neighboring cell in the order of, for example, good reception power quality using the measurement result of the serving cell and the neighboring cell. (Step S8).
  • the wireless terminal device 202 performs cell reselection to the highest cell. That is, radio terminal apparatus 202 determines to newly select a radio base station apparatus corresponding to the highest neighboring cell, for example, radio base station apparatus 101B, as a communication partner. And the radio
  • the wireless terminal device 202 executes an attach process that is a terminal registration process (step S12).
  • FIG. 4 is a diagram showing an exemplary sequence of a handover operation in the radio communication system according to the embodiment of the present invention.
  • radio terminal apparatus 202 moves from the state where it is located in cell CA and communicating with radio base station apparatus 101A to the overlapping area of cell CA and cell CB. To do.
  • a wireless base station device communicating with the wireless terminal device 202 or a handover source wireless base station device is also referred to as a serving base station
  • a handover destination wireless base station device is also referred to as a target base station.
  • the radio base station apparatus 101A is a serving base station
  • the radio base station apparatus 101B is a target base station
  • radio base station apparatus 101A obtains a frequency to be measured by radio terminal apparatus 202 in communication with itself and another radio base station apparatus that transmits a radio signal of the frequency. Set (step S31).
  • the wireless base station device 101A sends a measurement start request (Measurement Configuration) for causing the wireless terminal device 202 to measure the reception level of the wireless signal transmitted from the other wireless base station device that has been set.
  • This measurement start request includes neighboring cell information, that is, the cell ID of the radio base station apparatus to be measured. Further, the measurement start request includes the transmission frequency of each radio base station apparatus (step S32).
  • the wireless terminal device 202 receives the measurement start request from the wireless base station device 101A and starts the power measurement process (Measurement), that is, the wireless indicated by the measurement start request at the frequency indicated by the received measurement start request.
  • the received power of the radio signal transmitted from the base station apparatus is measured (step S33).
  • the wireless terminal device 202 transmits a measurement result notification (Measurement Report) indicating the measurement result of the received power to the wireless base station device 101A.
  • a measurement result notification (Measurement Report) indicating the measurement result of the received power
  • the wireless terminal device 202 periodically measures the received power, when the communication state with the wireless base station device 101A deteriorates, and with other wireless base station devices other than the wireless base station device 101A When the state becomes better, a measurement result notification is transmitted to the radio base station apparatus 101A (step S34).
  • the radio base station apparatus 101A acquires measurement information indicating the measurement result for each cell ID based on the measurement result notification received from the radio terminal apparatus 202, and stores it in a storage unit (not shown) (step S35).
  • the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. For example, the radio base station apparatus 101B is determined as a handover destination with reference to the information (step S36).
  • the radio base station device 101A transmits a handover request indicating the radio base station device 101B to the higher-level device (step S37).
  • the host device receives the handover request from the radio base station device 101A and transmits the handover request to the radio base station device 101B (step S38).
  • the radio base station apparatus 101B receives the handover request from the upper apparatus and transmits a handover response to the handover request to the upper apparatus (step S39).
  • the higher-level device receives a handover response from the radio base station device 101B and transmits a handover instruction to the radio base station device 101A (step S40).
  • the radio base station apparatus 101A receives a handover instruction from the host apparatus and transmits an RRC (Radio Resource Control) connection reconfiguration instruction (RRC Connection Reconfiguration) to the wireless terminal apparatus 202 (step S41).
  • RRC Radio Resource Control
  • the radio base station device 101A transmits a status notification indicating its own communication status to the higher-level device (step S42).
  • the higher-level device receives the status notification from the radio base station device 101A and transmits a status notification indicating the communication content with the radio terminal device 202 to the radio base station device 101B (step S43).
  • the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRCRRConnection Reconfiguration Complete) to the wireless base station device 101B ( Step S44).
  • RRCRRConnection Reconfiguration Complete RRC connection reconfiguration completion notification
  • the radio base station device 101B receives the RRC connection reconfiguration completion notification from the radio terminal device 202 and transmits a handover completion notification to the higher-level device (step S45).
  • the host device receives a handover completion notification from the radio base station device 101B and transmits a terminal information release instruction to the radio base station device 101A (step S46).
  • the wireless base station device 101A receives the terminal information release instruction from the higher-level device, releases information related to the wireless terminal device 202, and transmits a terminal information release completion notification to the higher-level device (step S47).
  • FIG. 5 is a diagram illustrating an example of a situation where an inappropriate handover operation (Too Late HO) occurs in the wireless communication system according to the embodiment of the present invention.
  • FIG. 6 is a diagram showing an example of an inappropriate handover operation (Too Late HO) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
  • “Too Late HO” refers to the following cases, for example. That is, before handover starts or during handover processing, a radio link disconnection (RLF: Radio Link Failure) occurs in the handover source radio base station apparatus, and a radio base station other than the handover source radio base station apparatus. This is a case where connection re-establishment of the wireless terminal device 202 to the device has occurred.
  • RLF Radio Link Failure
  • the detection method of “Too Late HO” is as follows, for example. That is, when the radio terminal device 202 reestablishes the radio link to the radio base station device 101B after causing the RLF for the radio base station device 101A, the radio base station device 101B notifies the radio base station device 101A of the RLF. Send. Thereby, the radio base station apparatus 101A detects “Too Late HO”.
  • the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A.
  • the wireless terminal device 202 measures the received power of the wireless signal transmitted from each wireless base station device, and wirelessly transmits a measurement result notification indicating the measured result of the received power. It transmits to base station apparatus 101A (step S51).
  • the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over.
  • the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S52).
  • the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an inter-base station interface (step S53).
  • the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S54).
  • the radio terminal apparatus 202 is out of service area of the cell CA, and Move to within the cell CB (step S55).
  • step S56 Due to the movement of the wireless terminal device 202, the RRC connection reconfiguration instruction (step S56) for instructing the handover transmitted from the wireless base station device 101A does not reach the wireless terminal device 202, and RLF is generated (step S56). S57).
  • the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101B.
  • a connection re-establishment request (RRC Connection Reestablishment Request) is transmitted (step S58).
  • the radio base station apparatus 101B receives the RRC connection re-establishment request from the radio terminal apparatus 202 and transmits an RRC connection re-establishment response to the radio terminal apparatus 202 (step S59). Thereby, an RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B.
  • the wireless terminal device 202 transmits an RRC connection re-establishment completion notification (RRC Connection Reestablishment Complete) to the wireless base station device 101B (step S60).
  • RRC Connection Reestablishment Complete RRC Connection Reestablishment Complete
  • This RRC connection re-establishment completion notification includes a parameter “rlf-InfoAvailable”, for example.
  • the wireless terminal device 202 sets this parameter and transmits an RRC connection re-establishment completion notification.
  • the radio base station apparatus 101B recognizes that an RLF has occurred in the radio terminal apparatus 202.
  • the radio base station apparatus 101B transmits a terminal information request (UE Information Request) to the radio terminal device 202 in order to acquire detailed information of the RLF (step S61).
  • UE Information Request terminal information request
  • the wireless terminal device 202 receives a terminal information request from the wireless base station device 101B, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101B (step S62).
  • the RLF report includes the PCI (Physical Cell ID) of the radio base station device in which the RLF has occurred, the PCI and ECGI (E- UTRAN Cell Global Identifier) of the radio base station device in which the RRC connection has been reestablished, and the own radio terminal device 202.
  • C-RNTI Cell Radio Network Temporary Identifier
  • the PCI of the RLF occurrence is the ID of the radio base station apparatus 101A
  • the PCI and ECGI of the RRC connection re-establishment occurrence are the ID of the radio base station apparatus 101B
  • the C-RNTI is assigned by the radio base station apparatus 101A ID.
  • the radio base station apparatus 101B recognizes that RLF has occurred in the radio base station apparatus 101A by referring to the PCI of the RLF report received from the radio terminal apparatus 202.
  • the radio base station apparatus 101B then transmits an RLF notification (RLF-INDICATION) including the contents of the RLF report to the radio base station apparatus 101A via the X2 interface in order to notify that it is “Too Late HO” ( Step S63).
  • the radio base station apparatus 101A recognizes that “Too Late HO” has occurred to the cell CB by referring to the PCI, ECGI, and C-RNTI of the RLF notification received from the radio base station apparatus 101B. (Step S64).
  • the radio base station apparatus 101A executes a handover operation optimization process so as to suppress the occurrence of “Too Late HO” in the cell CB (step S65).
  • FIG. 7 and 8 are diagrams illustrating an example of a situation in which an inappropriate handover operation (Too Early HO) occurs in the wireless communication system according to the embodiment of the present invention.
  • cell CB formed by radio base station apparatus 101B includes cell CB1 including the installation area of radio base station apparatus 101B, and radio base station apparatus 101B formed in cell CA.
  • the cell CB2 does not include an installation area.
  • FIG. 9 is a diagram showing an example of an inappropriate handover operation (Too Early HO) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
  • “Too Early HO” refers to the following cases, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and the wireless terminal device 202 is reconnected to the handover source wireless base station device. This is the case when establishment occurs.
  • the detection method of “Too Early HO” is as follows, for example. That is, when the handover destination radio base station apparatus 101B receives the RLF report from the handover source radio base station apparatus 101A, the handover to the radio terminal apparatus 202 itself is performed within a predetermined time from the reception timing. When the terminal information release instruction due to the completion of is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “Too Early HO”.
  • the radio base station apparatus 101B uses a timer to measure the predetermined time. As a result, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to the “Too Early HO” of the radio base station apparatus 101A. Can be determined.
  • radio terminal apparatus 202 moves into cell CB2 from a state where it is located in cell CA and is communicating with radio base station apparatus 101A (step S70). .
  • the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured received power to the radio base station. Transmit to the station apparatus 101A (Source eNB, Serving eNB) (step S71).
  • the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over.
  • the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S72).
  • the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an interface between base stations (step S73).
  • the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S74).
  • the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S75).
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101B. (Step S76).
  • the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202 and transmits a terminal information release instruction to the radio base station apparatus 101A (step S77).
  • the radio base station apparatus 101B starts a timer in order to measure the stay time in the cell CB of the radio terminal apparatus 202 (step S78).
  • the radio base station apparatus 101A receives a terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) on the radio terminal apparatus 202 (step S79).
  • step S80 the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless terminal device 202B is completed (step S80).
  • the radio terminal apparatus 202 moves outside the cell CB and within the cell CA (step S81).
  • step S83 since the wireless terminal device 202 cannot communicate with the wireless base station device 101B, RLF occurs (step S83).
  • the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101A.
  • a connection re-establishment request (RRC Connection Reestablishment Request) is transmitted (step S84).
  • the radio base station apparatus 101A since the radio base station apparatus 101A has released and does not hold the information (UE Context) regarding the radio terminal apparatus 202, the radio base station apparatus 101A can accept the RRC connection re-establishment request from the radio terminal apparatus 202. If it is not possible (step S85), an RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S86).
  • the radio terminal apparatus 202 when receiving the RRC connection re-establishment rejection from the radio base station apparatus 101A, the radio terminal apparatus 202 starts a normal connection procedure with the radio base station apparatus 101A (step S87).
  • the wireless terminal device 202 transmits an RRC connection request (RRC Connection Request) to the wireless base station device 101A (step S88).
  • the wireless base station device 101A receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S89).
  • RRC connection information RRC Connection Setup
  • the radio terminal apparatus 202 receives the RRC connection information from the radio base station apparatus 101A and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S90).
  • the radio base station apparatus 101A receives the RRC connection completion notification from the radio terminal apparatus 202, and transmits security information (Security Mode Command) to the radio terminal apparatus 202 (step S91).
  • the wireless terminal device 202 receives security information from the wireless base station device 101A, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101A (step S92).
  • the radio base station device 101A transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S93).
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101A. (Step S94).
  • the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”.
  • the wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification.
  • the radio base station apparatus 101A recognizes that an RLF has occurred in the radio terminal apparatus 202.
  • the wireless base station device 101A transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S95).
  • UE Information Request terminal information request
  • the wireless terminal device 202 receives a terminal information request from the wireless base station device 101A, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101A (step S96).
  • the RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202.
  • the PCI of the RLF occurrence is the ID of the radio base station apparatus 101B
  • the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101A
  • the C-RNTI is assigned by the radio base station apparatus 101B ID.
  • the radio base station apparatus 101A recognizes that RLF has occurred in the radio base station apparatus 101B by referring to the PCI of the RLF report received from the radio terminal apparatus 202, and performs “Too Late HO” to the cell CA. "Is generated (step S97).
  • the radio base station apparatus 101A transmits an RLF notification (RLFRINDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface. (Step S98).
  • the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined not to be “Too Late HO” to the cell CA but to “Too Early HO” to the cell CB.
  • the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101A and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CA It is determined that it is “Too Late HO”.
  • the radio base station apparatus 101B determines that it is “Too Early HO” to the cell CB (step S99), it transmits a handover report to the radio base station apparatus 101A (step S100).
  • This handover report includes, for example, a parameter “Handover Report Type”.
  • the radio base station apparatus 101B notifies the radio base station apparatus 101A of “Too Early HO” by setting this parameter to a predetermined value.
  • the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “Too Early HO” has occurred to the cell CB (step S101), and “Too Early HO”.
  • the optimization process of the handover operation is executed so as to suppress the occurrence of (step S102).
  • FIG. 10 is a diagram illustrating an example of a situation in which an inappropriate handover operation (HO to Wron Cell) occurs in the wireless communication system according to the embodiment of the present invention.
  • FIG. 11 is a diagram showing an example of an improper handover operation (HO to Wron Cell) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
  • HO to Wong Cell refers to the following cases, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and wireless communication is performed with respect to wireless base station devices other than the handover source and handover destination wireless base station devices. This is a case where the connection re-establishment of the terminal device 202 occurs.
  • the detection method of “HO to Wong Cell” is as follows. That is, when the radio base station apparatus 101B that is the handover destination receives the RLF report from the radio base station apparatus 101C other than the radio base station apparatus 101A that is the handover source, the radio terminal is traced back from the reception timing within a predetermined time. When the terminal information release instruction due to the completion of the handover of the apparatus 202 to itself is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “HO to Wong Cell”.
  • the radio base station apparatus 101B uses a timer to measure the predetermined time. Thereby, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to the “HO to Wong Cell” of the radio base station apparatus 101A. Can be determined.
  • the wireless terminal device 202 when the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A, the wireless terminal device 202 moves to the overlapping area of the virtual cell CBV and the cell CA ( Assume step S110).
  • the virtual cell CBV is a virtual cell expanded from the cell CB in accordance with the offset OST that is a parameter in order to promote handover from the radio base station apparatus 101A to the radio base station apparatus 101B.
  • the offset OST is a parameter held by the radio base station apparatus 101A.
  • radio terminal apparatus 202 measures the received power of a radio signal transmitted from a radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured received power to radio base station. Transmit to the station apparatus 101A (step S111).
  • the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over.
  • the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S112).
  • the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an interface between base stations (step S113).
  • the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S114).
  • the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S115).
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101B. (Step S116).
  • the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A (step S117).
  • the radio base station apparatus 101B starts a timer in order to measure the staying time in the cell CB of the radio terminal apparatus 202 (step S118).
  • the radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (step S119).
  • step S120 the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless terminal device 202B is completed (step S120).
  • the radio terminal apparatus 202 moves outside the cell CB and within the virtual cell CBV and cell CC (step S121).
  • the radio terminal apparatus 202 has a large interference of radio signals transmitted from the radio base station apparatus 101C (Other eNB), and cannot communicate with the radio base station apparatus 101B, so that RLF occurs (step S123). .
  • the radio terminal apparatus 202 searches for nearby radio base station apparatuses by measuring the reception power of radio signals or the like. In this case, since the reception power of the radio signal from the radio base station apparatus 101C is maximized, the radio terminal apparatus 202 reestablishes an RRC connection reestablishment request (RRCRRConnection) in order to reconnect to the searched radio base station apparatus 101C. Reestablishment (Request) is transmitted to the radio base station apparatus 101C (step S124).
  • RRCRRConnection RRC connection reestablishment request
  • the wireless base station device 101C since the wireless base station device 101C does not hold information (UE Context) regarding the wireless terminal device 202, the wireless base station device 101C cannot accept the RRC connection re-establishment request from the wireless terminal device 202 (step S125). ), RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S126).
  • UE Context information regarding the wireless terminal device 202
  • the radio terminal apparatus 202 receives an RRC connection re-establishment rejection from the radio base station apparatus 101C, and starts a normal connection procedure with the radio base station apparatus 101C (step S127).
  • the wireless terminal device 202 transmits an RRC connection request (RRC Connection Request) to the wireless base station device 101C (step S128).
  • the wireless base station device 101C receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S129).
  • RRC connection information RRC Connection Setup
  • the wireless terminal device 202 receives RRC connection information from the wireless base station device 101C, and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S130).
  • the wireless base station device 101C receives the RRC connection completion notification from the wireless terminal device 202, and transmits security information (Security Mode Command) to the wireless terminal device 202 (step S131).
  • the wireless terminal device 202 receives the security information from the wireless base station device 101C, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101C (step S132).
  • the wireless base station device 101C transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the wireless terminal device 202 (step S133).
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101C. (Step S134).
  • the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”.
  • the wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification. Thereby, the radio base station apparatus 101C recognizes that an RLF has occurred in the radio terminal apparatus 202.
  • the wireless base station device 101C transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S135).
  • UE Information Request terminal information request
  • the wireless terminal device 202 receives a terminal information request from the wireless base station device 101C, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101C (step S136).
  • the RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202.
  • the PCI of the RLF occurrence is the ID of the radio base station apparatus 101B
  • the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101C
  • the C-RNTI is assigned by the radio base station apparatus 101B ID.
  • the wireless base station device 101C recognizes that RLF has occurred in the wireless base station device 101B by referring to the PCI of the RLF report received from the wireless terminal device 202, and performs “Too Late HO” to the cell CC. "Is generated (step S137).
  • the radio base station apparatus 101B transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface. (Step S138).
  • the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” to the cell CC, and further, the RLF notification is received from the radio base station device 101C other than the radio base station device 101A. It is determined that it is not “Too Early HO” but “HO to Wron Cell” to the cell CB.
  • the radio base station apparatus 101B When the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101C and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CC It is determined that it is “Too Late HO”.
  • the radio base station apparatus 101B determines that it is “HO to Wong Cell” to the cell CB (step S139), it transmits a handover report to the radio base station apparatus 101A (step S140).
  • This handover report includes, for example, a parameter “Handover Report Type”.
  • the radio base station apparatus 101B notifies the radio base station apparatus 101A of “HO to Wong Cell” by setting this parameter to a predetermined value.
  • the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “HO to Wong Cell” has occurred to the cell CB (step S141), and performs “HO to Wong”.
  • the optimization process of the handover operation is executed so that the occurrence of “Cell” is suppressed (step S142).
  • FIG. 12 is a diagram illustrating a reception quality simulation result of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
  • FIG. 12 shows the RSSI (Received Signal Strength Strength Indication) of the wireless terminal device 202 for 100 seconds until the wireless terminal device 202 passes near the pico base station at a speed of 30 km per hour and passes near the macro base station.
  • RSSI Receiveived Signal Strength Strength Indication
  • graphs G1 and G3 indicate RSSIs of radio signals transmitted from the macro base station
  • graphs G2 and G4 indicate RSSIs of radio signals transmitted from the pico base station.
  • the graphs G1 and G2 take into account the temporal change in the received power of the radio signal in the radio terminal device 202 caused by shadowing, that is, the relative position change between the radio terminal device 202 and other objects. Simulation results, and graphs G3 and G4 are simulation results that do not consider shadowing.
  • the ideal position for handover of the wireless terminal device 202 from the pico base station to the macro base station is the vicinity of the intersection of the graph, that is, the position where the movement time is about 17 seconds.
  • the radio signal from each radio base station apparatus is intricate in the travel time of 15 to 20 seconds, for example, “Too Early HO” or “Ping Pong HO” is likely to occur. Also, near the timing when the movement time is 20 seconds, the reception power of the radio signal from the pico base station suddenly decreases, the reception power of the radio signal from the macro base station suddenly increases, and SINR (Signal to Interference -plus-Noise (Ratio) is abruptly deteriorated, and “Too Late HO” is likely to occur.
  • SINR Signal to Interference -plus-Noise
  • Y MRO (X)
  • Y is, for example, the occurrence frequency of “Too Late HO”, “Too Early HO” “Occurrence frequency”, “HO to Wong Cell” occurrence frequency, “Ping Pong HO” unnecessary handover occurrence frequency, etc.
  • the radio terminal device 202 connects to the radio base station device This is the frequency of occurrence of handover immediately after being performed.
  • X is a parameter for power measurement processing (Measurement), and hysteresis HS: 0 dB to +15 dB, TTT (Time to) Trigger): 0 ms to 5120 ms, or offset OST (Cell Individual Offset): ⁇ 24 dB to +24 dB It is.
  • X is a parameter for cell reselection processing.
  • the hysteresis HS and TTT can be set for each event described later
  • the offset OST can be set for each serving cell formed by the serving base station and each neighboring cell
  • the gap MG and the filtering coefficient ⁇ described later can be set for each serving cell. It can be set.
  • the wireless base station device determines handover when receiving a measurement result notification (Measurement Report). That is, the transmission timing of the measurement result notification corresponds to the handover timing.
  • FIG. 13 is a diagram showing an event A1 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention.
  • the horizontal axis is time
  • the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202
  • the SVC is the reception power or SINR of the serving cell, that is, the reception power of the radio signal transmitted by the serving base station or SINR.
  • hysteresis HS is set in a positive or negative direction with respect to threshold value Th.
  • the wireless terminal device 202 transitions to the report on state (timing T1).
  • the wireless terminal device 202 transmits a measurement result notification (timing T2).
  • the wireless terminal device 202 transmits a measurement result notification (timing T3).
  • timing T4 the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T4).
  • the wireless terminal device 202 performs a power measurement process periodically, for example, regardless of the transition between the report-on state and the report-off state, and transmits the latest measurement result as a measurement result notification. Further, for example, radio terminal apparatus 202 performs transition between the report-on state and the report-off state independently for each of received power and SINR. That is, the wireless terminal device 202 transmits a measurement result notification if a condition is satisfied for one of the received power and SINR.
  • FIG. 14 is a diagram showing an event A2 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
  • hysteresis HS is set in a positive or negative direction with respect to threshold value Th.
  • the wireless terminal device 202 transitions to the report on state (timing T11).
  • the wireless terminal device 202 transmits a measurement result notification when TTT elapses from timing T11 in a state where the condition that the received power or SINR is smaller than (Th + HS) is satisfied (timing T12).
  • the wireless terminal device 202 transmits a measurement result notification (timing T13).
  • the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T14).
  • FIG. 15 is a diagram showing an event A3 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention.
  • the horizontal axis is time
  • the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202
  • the SVC is the reception power or SINR of the serving cell
  • the NBC is the reception power or SINR of the neighboring cell. This is the reception power or SINR of a radio signal transmitted by a neighboring base station.
  • offset OST1 is set in the positive direction with respect to the reception power or SINR of the serving cell, and hysteresis HS is set in the positive and negative directions. Also, the offset OST2 is set in the positive direction with respect to the reception power or SINR of the neighboring cells.
  • the wireless terminal device 202 transitions to the report-on state when ⁇ (reception power or SINR of neighboring cells) + OST2 ⁇ becomes larger than ⁇ (reception power or SINR of the serving cell) + OST1 + HS ⁇ (timing T21).
  • the wireless terminal device 202 performs the processing from the timing T21 to the TTT in a state where ⁇ (neighboring cell received power or SINR) + OST2 ⁇ is larger than ⁇ (serving cell received power or SINR) + OST1-HS ⁇ .
  • a measurement result notification is transmitted (timing T22).
  • the wireless terminal device 202 transmits a measurement result notification (timing T23).
  • the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T24).
  • FIG. 16 is a diagram showing an event A4 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
  • the offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cells, and the hysteresis HS is set in the positive and negative direction with respect to the threshold Th.
  • Wireless terminal apparatus 202 transitions to a report-on state when ⁇ (reception power or SINR of neighboring cells) + OST ⁇ is greater than (Th + HS) (timing T31).
  • wireless terminal apparatus 202 transmits a measurement result notification when TTT elapses from timing T31 while the condition that ⁇ (reception power or SINR of the neighboring cell) + OST ⁇ is larger than (Th ⁇ HS) is satisfied. (Timing T32).
  • the wireless terminal device 202 transmits a measurement result notification (timing T33).
  • the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T34).
  • FIG. 17 is a diagram showing an event A5 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
  • the offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cell, and the hysteresis HS1 is set in the positive and negative direction with respect to the threshold Th1.
  • Hysteresis HS2 is set in the positive and negative directions with respect to Th2.
  • the wireless terminal device 202 transitions to the report on state. (Timing T41).
  • Radio terminal 202 satisfies the condition that the reception power or SINR of the serving cell is smaller than (Th1 + HS1) and ⁇ (reception power or SINR of the neighboring cell) + OST ⁇ is larger than (Th2-HS2).
  • TTT elapses from timing T41 in a state where it is in a state, a measurement result notification is transmitted (timing T42).
  • the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T43).
  • the timing of the handover operation of the wireless terminal device 202 can be controlled by adjusting the parameters described in the events A1 to A5, that is, the hysteresis HS, TTT, and the offset OST.
  • FIG. 18 is a diagram showing timing control of the handover operation by adjusting the hysteresis HS in the wireless communication system according to the embodiment of the present invention.
  • FIG. 18 shows the case of event A3.
  • hysteresis HS when hysteresis HS is set to zero, a transition is made to the report on state at timing T51, a measurement result notification is transmitted at timing T53, and a transition to the report off state is made at timing T55.
  • the state transits to the report-on state at timing T52 after timing T51, the measurement result notification is transmitted at timing T54 after timing T53, and timing T55. At a later timing T56, the state transits to the report off state.
  • the transmission timing of the measurement result notification that is, the timing of the handover operation can be delayed.
  • FIG. 19 is a diagram showing handover operation timing control by adjusting TTT in the wireless communication system according to the embodiment of the present invention.
  • FIG. 19 shows the case of event A3.
  • the transmission timing of the measurement result notification that is, the timing of the handover operation can be delayed.
  • FIG. 20 is a diagram showing timing control of the handover operation by adjusting the offset OST in the wireless communication system according to the embodiment of the present invention.
  • FIG. 20 shows the case of event A3.
  • the state transits to the report on state at timing T72 after timing T71, the measurement result notification is transmitted at timing T74 after timing T73, and timing T76. Transition to the report-off state at an earlier timing T75.
  • the transmission timing of the measurement result notification that is, the timing of the handover operation can be delayed.
  • the timing of the handover operation is delayed by increasing the hysteresis HS, increasing the TTT, or decreasing the offset OST. That is, since the time for which the wireless terminal device 202 is connected to the serving base station becomes longer, the occurrence frequency of “Too Early HO”, “HO to Wong Cell” and “Ping Pong HO” is reduced, and “Too Late HO” The frequency of occurrence will increase.
  • the handover timing can be adjusted by adjusting any of the parameters, but these effects differ depending on the topography including interference, the moving speed of the wireless terminal device, and the like.
  • Adjusting the hysteresis HS and the offset OST corresponds to adjusting the position where the handover is performed by virtually increasing or decreasing the cell. For example, by increasing the hysteresis HS of the serving cell, the received power of the radio signal is increased and the handover to another cell is difficult to be performed. Also, by setting the offset OST of the neighboring cell to a negative value, the received power of the radio signal from the neighboring cell appears to be small, and handover to another cell is difficult to be performed.
  • the hysteresis HS and the offset OST are parameters that are not easily influenced by the moving speed of the wireless terminal device.
  • FIG. 21 is a diagram showing an example of received power of a radio signal at each position in the radio communication system according to the embodiment of the present invention.
  • the timing of the handover operation by adjusting the hysteresis HS at the positions P1, P3, and P5 where the received power reaches the maximum value. Further, it is preferable to adjust the timing of the handover operation by adjusting the offset OST at the positions P2, P4, and P6 at which the received power becomes the minimum value.
  • TTT is a parameter that can delay the timing of the handover operation in the time domain.
  • the timing of the handover operation does not depend on the radio wave environment and the landform, but the position where the handover is performed varies greatly depending on the moving speed of the wireless terminal device 202. For example, if the TTT is set too large, a wireless terminal device that moves at high speed is likely to fail in handover because the surrounding radio wave environment changes greatly.
  • FIG. 22 is a diagram for explaining another example of parameters for controlling the timing of the handover operation in the wireless communication system according to the embodiment of the present invention.
  • radio terminal apparatus 202 measures the received power of a radio signal transmitted from the radio base station apparatus, for example, at time intervals of gap MG.
  • the gap MG When the gap MG is increased, the received power of the past is used for the handover determination, so the timing of the handover operation is delayed. On the other hand, when the gap MG is made smaller, the more recent received power is used for the handover decision, so the timing of the handover operation is advanced.
  • the gap MG By reducing the gap MG, it is possible to perform an appropriate handover based on more recent received power. On the other hand, by increasing the gap MG, the processing load on the wireless terminal device 202 can be reduced.
  • the wireless terminal device 202 transmits a measurement result notification indicating the received power MR (t) to the wireless base station device.
  • the filtering coefficient ⁇ When the filtering coefficient ⁇ is increased, the past received power is reflected in the measurement result notification, so the timing of the handover operation is delayed. On the other hand, when the filtering coefficient ⁇ is reduced, the more recent received power is reflected in the measurement result notification, so that the timing of the handover operation is advanced.
  • an offset OST is set for each neighboring cell, and the event At least one of A1 to A5 is set, and hysteresis HS and TTT corresponding to the set event are set.
  • the gap MG and the filtering coefficient ⁇ are set for each serving cell.
  • FIG. 23 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention.
  • the radio terminal apparatus 202 After performing a handover operation to the radio base station apparatus 101, the radio terminal apparatus 202, based on the mobility state parameters (MobilityStateParameters) included in the RRC connection reconfiguration instruction received from the radio base station apparatus 101 in the handover operation, It is possible to perform an estimation process of its own movement state.
  • MobilityStateParameters mobility state parameters
  • the wireless terminal device 202 changes its movement state to a normal movement state (Normal-mobility State), a high-speed movement state (High-mobility State), or a medium-speed movement state.
  • a normal movement state Normal-mobility State
  • High-mobility State High-mobility State
  • a medium-speed movement state Set to (Medium-mobility State).
  • wireless terminal apparatus 202 uses a timer to measure a period for counting the number of times of execution of a handover operation.
  • the wireless terminal device 202 sets the measurement time of the timer to t-Evaluation in the movement state parameter, and starts the timer (step S202).
  • the wireless terminal device 202 counts the number of executions of the handover operation from when the timer is started until the timer expires (step S204).
  • radio terminal apparatus 202 sets its own movement state to the high-speed movement state (step S208).
  • the self movement state is set to the medium speed movement state (step S212).
  • the radio terminal apparatus 202 checks whether the timer has expired (step S214).
  • wireless terminal apparatus 202 continues to count the number of times the handover operation is executed. (Step S204).
  • wireless terminal apparatus 202 changes its own movement state to the normal movement state. Setting is made (step S216).
  • the wireless terminal device 202 estimates its movement state based on the number of handover operations executed within a predetermined time indicated by t-Evaluation in the connection established state.
  • FIG. 24 is a flowchart defining an operation procedure when the idle wireless terminal apparatus performs the movement state detection process in the wireless communication system according to the embodiment of the present invention.
  • the radio terminal apparatus 202 can perform its own movement state estimation process based on the movement state parameter included in the RRC connection reconfiguration instruction received from the wireless base station apparatus 101, for example.
  • the wireless terminal device 202 changes its movement state to a normal movement state (Normal-mobility State), a high-speed movement state (High-mobility State), or a medium-speed movement state.
  • a normal movement state Normal-mobility State
  • High-mobility State High-mobility State
  • a medium-speed movement state Set to (Medium-mobility State).
  • the wireless terminal device 202 uses a timer to measure a period for counting the number of execution times of the cell reselection operation.
  • the wireless terminal device 202 sets the measurement time of the timer to t-Evaluation in the movement state parameter, and starts the timer (step S242).
  • the wireless terminal device 202 counts the number of execution times of the cell reselection operation from when the timer is started until the timer expires (step S244).
  • radio terminal apparatus 202 sets its own movement state to the high-speed movement state. (Step S248).
  • the self movement state is set to the medium speed movement state (step S252).
  • the wireless terminal device 202 checks whether the timer has expired (step S254).
  • wireless terminal apparatus 202 continues to execute the number of cell reselection operations. Count (step S244).
  • wireless terminal apparatus 202 changes its own movement state to the normal movement state. Setting is made (step S256).
  • the wireless terminal device 202 estimates its own movement state in the idle state, for example, based on the number of executions of the cell reselection operation within a predetermined time indicated by t-Evaluation.
  • FIG. 25 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state adjusts timing of a handover operation in the wireless communication system according to the embodiment of the present invention.
  • the wireless terminal device 202 can adjust the timing of the handover operation based on the estimated own movement state.
  • the operation illustrated in FIG. 25 is started when the wireless terminal device 202 transitions to the report on state in the event A3 in a state where the event A3 is set in the wireless terminal device 202 by the wireless base station device 101, for example.
  • step S282 when the mobile terminal device 202 is in a high-speed mobile state (YES in step S282), the wireless terminal device 202 multiplies the TTT held by itself by sf-High, which is a scale factor (step S284).
  • the wireless terminal device 202 when the wireless terminal device 202 is not in the high-speed movement state (NO in step S282) and is in the medium-speed movement state (YES in step S286), the wireless terminal device 202 is a scaling factor in the TTT held by itself. Multiply -Medium (step S288).
  • step S290 when the mobile terminal 202 is not in the medium speed mobile state (NO in step S286), the wireless terminal device 202 does nothing with respect to the TTT held by the wireless terminal device 202 (step S290).
  • the wireless terminal device 202 adjusts the timing of the handover operation by adjusting the TTT.
  • the reception power of the radio signal transmitted from the radio base station apparatus 101B is greater than the reception power of the radio signal transmitted from the radio base station apparatus 101A that is the serving base station.
  • a measurement result notification indicating the measured received power is transmitted to the serving base station.
  • step S284 the wireless terminal device 202 multiplies the TTT held by itself by sf-High, which is a scale factor.
  • sf-High has a value of 0.25, 0.50, 0.75, or 1.00, and is notified from the radio base station apparatus 101 in advance.
  • TTT multiplied by sf-High set to a value of 0.25, 0.50, or 0.75 is smaller than TTT before multiplication.
  • step S288 the wireless terminal device 202 multiplies the TTT held by itself by sf-Medium, which is a scale factor.
  • sf-Medium takes a value of 0.25, 0.50, 0.75, or 1.00, and is notified from the radio base station apparatus 101 in advance.
  • TTT multiplied by sf-Medium set to a value of 0.25, 0.50, or 0.75 is smaller than TTT before multiplication.
  • the TTT in the high speed movement state or the medium speed movement state is the TTT in the normal movement state. Smaller than For this reason, when the wireless terminal device 202 is in the high speed movement state or the medium speed movement state, the wireless terminal device 202 transmits the measurement result notification to the serving base station at an earlier timing than in the normal movement state.
  • the serving base station determines whether or not to perform a handover based on the measurement result notification received from the wireless terminal device 202
  • the wireless terminal device 202 reduces the TTT based on the estimated movement state of itself.
  • the timing of the handover operation can be advanced.
  • FIG. 26 is a flowchart defining an operation procedure when the idle radio terminal apparatus performs timing adjustment of the cell reselection operation in the radio communication system according to the embodiment of the present invention.
  • the wireless terminal device 202 can adjust the timing of the cell reselection operation based on its own movement state estimated in the idle state.
  • the radio terminal apparatus 202 compares the received power of the radio signal transmitted from the serving base station with the received power of the radio signal transmitted from the other radio base station apparatus 101. Qhyst notified from the radio base station apparatus 101 is added to the received power of the radio signal transmitted from the radio base station 101.
  • the radio terminal device 202 determines that the received power of the radio signal transmitted from the serving base station is larger than the actual value, so cell reselection to another radio base station device 101 is performed. Is less likely to occur.
  • the wireless terminal device 202 determines that the received power of the wireless signal transmitted from the serving base station is smaller than the actual power, so that the cell re-transmission to other wireless base station devices 101 is performed. Selection is likely to occur.
  • the wireless terminal device 202 can adjust the timing of the cell reselection operation by changing the value of Qhyst.
  • the movement state of the wireless terminal device 202 transitions to any of a high-speed movement state, a medium-speed movement state, and a normal movement state.
  • wireless terminal apparatus 202 sets sf-High, which is a scale factor included in parameter q-HystSF, to self Is added to Qhyst held by (step S324).
  • wireless terminal apparatus 202 is a scale factor included in parameter q-HystSF when its own movement state is not a high-speed movement state (NO in step S322) and is a medium-speed movement state (YES in step S326).
  • sf-Medium is added to Qhyst held by itself (step S328).
  • the wireless terminal device 202 does nothing with respect to the Qhyst held by the wireless terminal device 202 (step S330).
  • the wireless terminal device 202 adjusts the timing of the cell reselection operation by adjusting Qhyst.
  • step S324 the wireless terminal device 202 adds sf-High, which is a scale factor, to Qhyst notified from the wireless base station device 101.
  • sf-High takes a value of ⁇ 6 dB, ⁇ 4 dB, ⁇ 2 dB, or 0 dB, and is notified from the radio base station apparatus 101 in advance.
  • Qhyst obtained by adding sf-High set to a value of ⁇ 6 dB, ⁇ 4 dB, or ⁇ 2 dB is smaller than Qhyst before addition.
  • step S328 the wireless terminal device 202 adds sf-Medium, which is a scale factor, to Qhyst notified from the wireless base station device 101.
  • sf-Medium takes a value of ⁇ 6 dB, ⁇ 4 dB, ⁇ 2 dB, or 0 dB, and is notified from the radio base station apparatus 101 in advance.
  • Qhyst obtained by adding sf-Medium set to a value of ⁇ 6 dB, ⁇ 4 dB, or ⁇ 2 dB is smaller than Qhyst before addition.
  • FIG. 27 is a diagram showing a comparison of the number of executions of the movement operation based on the movement path of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
  • radio base station apparatuses 101A and 101B are, for example, macro base stations, and form macro cells MCA and MCB, respectively.
  • Radio base station apparatuses 101D, 101E, and 101F are pico base stations, for example, and form pico cells PCD, PCE, and PCF, respectively.
  • the pico cells PCD and PCE are included in the macro cell MCA, and the pico cell PCF is included in the macro cell MCB.
  • the wireless terminal device 202A moves from the point S via the route P to the point E, and the wireless terminal device 202B moves from the point S via the route Q to the point E. That is, the wireless terminal device 202B moves in a heterogeneous network in which macro cells and pico cells are mixed.
  • the wireless terminal device 202A When the wireless terminal device 202A departs from the point S within the macro cell MCA formed by the wireless base station device 101A, which is a macro base station, before entering the point E, the wireless terminal device 202A enters the macro cell MCB (step S352).
  • the wireless terminal device 202A performs a first handover operation in the area AP1, for example, and changes the connection destination from the wireless base station device 101A to the wireless base station device 101B (step S354).
  • the wireless terminal device 202A leaves the area of the macro cell MCA and arrives at the point E (step S356).
  • the wireless terminal device 202A performs a handover operation only once from the point S until it arrives at the point E.
  • the wireless terminal device 202B departs from a point S that is within the macro cell MCA formed by the wireless base station device 101A that is a macro base station, first, the wireless terminal device 202D that is formed by the wireless base station device 101D that is a pico base station. (Step S358). At this time, for example, a handover operation is performed in the area AQ1, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101A to the wireless base station device 101D.
  • step S360 the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101D to the wireless base station device. It is changed to 101A (step S360).
  • the wireless terminal device 202B enters the area of the picocell PCE formed by the wireless base station device 101E that is a pico base station (step S362).
  • the third handover operation is executed in the area AQ3, and the connection destination of the radio terminal apparatus 202B is changed from the radio base station apparatus 101A to the radio base station apparatus 101E.
  • step S364 the fourth handover operation is performed in the area AQ4, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101E to the wireless base station device. 101A is changed (step S364).
  • the wireless terminal device 202B enters the area of the macro cell MCB (step S366).
  • the fifth handover operation is performed in the area AQ5, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101A to the wireless base station device 101B (step S368).
  • the wireless terminal device 202B leaves the macro cell MCA and enters the pico cell PCF formed by the wireless base station device 101F, which is a pico base station (step S370).
  • the sixth handover operation is executed in the area AQ6, and the connection destination of the radio terminal apparatus 202B is changed from the radio base station apparatus 101B to the radio base station apparatus 101F.
  • step S372 the seventh handover operation is performed in the area AQ7, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101F to the wireless base station device. 101B is changed (step S372).
  • the wireless terminal device 202A arrives at a point E existing within the macro cell MCB (step S374).
  • the wireless terminal device 202A and the wireless terminal device 202B move at the same speed. Accordingly, the time required for the wireless terminal device 202A to move from the point S via the route P to the point E, and the time required for the wireless terminal device 202B to move from the point S via the route Q to the point E. Time is equal.
  • the wireless terminal device 202A performs the handover operation only once at the time, whereas the wireless terminal device 202B performs the handover operation seven times at the time. Accordingly, the wireless terminal device 202A sets the own movement state to the normal movement state in step S216 shown in FIG.
  • radio terminal apparatus 202B has a high number of times of execution of the handover operation, so in step S206 shown in FIG. 23, for example, the number of times of execution of the handover operation is n-CellChangeHigh or more at a time corresponding to t-Evaluation.
  • step S208 shown in FIG. 23 the self movement state is set to the high speed movement state.
  • the wireless terminal device 202A does not change the TTT in step S290 shown in FIG. 25, but the wireless terminal device 202B erroneously estimates that its own moving state is a moving state faster than the actual state.
  • TTT is shortened by multiplying TTT by sf-High. For this reason, the timing of the handover operation of the wireless terminal device 202B is advanced, and the timing of the handover operation in the wireless terminal device 202B becomes inappropriate.
  • the wireless terminal device 202B is likely to cause an inappropriate handover operation such as “Too Early HO”, “HO to Wong Cell”, and “Ping Pong HO”.
  • the handover operation in which the wireless terminal device 202 moves in the connection established state is assumed.
  • the cell reselection operation in which the wireless terminal device 202 moves while changing the selection destination cell in the idle state can be similarly discussed by replacing the handover operation with the cell reselection operation.
  • the wireless terminal device 202A that has arrived at the point E from the point S via the route P in the idle state has only performed the cell reselection operation once, for example, the wireless terminal device 202A itself in step S256 shown in FIG. Set the movement state of to normal movement.
  • step S246 it is determined that the number of executions of the selection operation is equal to or greater than n-CellChangeHigh in a time corresponding to t-Evaluation, and the own movement state is set to a high-speed movement state in step S248 shown in FIG.
  • the wireless terminal device 202A does not change Qhyst in step S330 shown in FIG. 26, but the wireless terminal device 202B erroneously estimates that its own moving state is a moving state faster than the actual state.
  • step S324 shown in FIG. 26 Qhyst is reduced by adding sf-High having a negative value to Qhyst. For this reason, the wireless terminal device 202B may be out of service by performing a cell reselection operation at an early timing.
  • the wireless terminal device 202B since the wireless terminal device 202B is located in the cell, it is necessary to re-execute processing such as searching for the frequency of the wireless signal from the wireless base station device 101, and the power consumption of the wireless terminal device 202B is reduced.
  • Non-Patent Document 1 when performing the estimation process of the movement state of the wireless terminal device 202 according to the technique described in Non-Patent Document 1, a handover operation or a cell reselection operation per predetermined time without considering the cell form and the cell size The movement state of the wireless terminal device 202 is estimated based only on the number of executions of.
  • the radio terminal apparatus 202 and the radio base station apparatus 101 solve the above problem by correctly estimating the movement state even in the heterogeneous network with the following configuration and operation.
  • FIG. 28 is a diagram illustrating the configuration of the wireless terminal device according to the embodiment of the present invention.
  • wireless terminal apparatus 202 includes antenna 81, circulator 82, wireless receiver 83, wireless transmitter 84, signal processor 85, controller 88, and input / output unit 89.
  • the signal processing unit 85 includes a reception signal processing unit 86 and a transmission signal processing unit 87.
  • the signal processing unit 85, the control unit 88, and the input / output unit 89 are realized by a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.
  • CPU Central Processing Unit
  • DSP Digital Signal Processor
  • the circulator 82 outputs a radio signal received from the antenna 81 from the radio base station apparatus 101 that is a macro base station, a pico base station, or a femto base station to the radio reception unit 83 and received from the radio transmission unit 84 A radio signal is output to the antenna 81.
  • the radio reception unit 83 frequency-converts the radio signal received from the circulator 82 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to the reception signal processing unit 86.
  • IF Intermediate Frequency
  • the received signal processing unit 86 performs signal processing such as FFT (Fast Fourier Transform) in the OFDM (Orthogonal Frequency Division Multiplex) method on the digital signal received from the wireless receiving unit 83, and one of the digital signals after the signal processing is performed. Part or all of the data is converted into a predetermined frame format and output to the control unit 88.
  • FFT Fast Fourier Transform
  • OFDM Orthogonal Frequency Division Multiplex
  • the transmission signal processing unit 87 performs signal processing such as spreading processing in the CDMA (Code Division Multiple Access) system for communication data obtained by converting the communication data received from the control unit 88 into a predetermined frame format or communication data generated by itself.
  • the digital signal after the signal processing is output to the wireless transmission unit 84.
  • the wireless transmission unit 84 converts the digital signal received from the transmission signal processing unit 87 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs it to the circulator 82.
  • the control unit 88 converts the digital signal stored in the frame format received from the reception signal processing unit 86 into, for example, audio data and video data, and if necessary, converts it into an analog signal, and then converts it into a speaker, a microphone, a display, and The data is output to the input / output unit 89 configured by a key input device.
  • control unit 88 receives from the input / output unit 89, for example, a control signal for controlling the wireless terminal device 202 received in the voice data and the key input device. Then, the control unit 88 processes a part of the received audio data and control signal as necessary, and converts the processed audio data and control signal into a predetermined frame format for transmission to another wireless terminal device 202. To do.
  • control unit 88 exchanges various information with each unit in the wireless terminal device 202.
  • FIG. 29 is a diagram illustrating a configuration of a control unit in the wireless terminal device according to the embodiment of the present invention.
  • control unit 88 includes setting unit 11, moving state estimation unit 12, count unit 13, timer 14, base station type determination unit 15, and received power measurement unit (received power report unit). ) 16 and a notification unit (reception power report unit) 17.
  • the timer 14 sets and starts the measurement time, the timer 14 continues to operate until the set measurement time elapses. By checking the operating state of the timer 14, it is possible to know whether or not the measurement time has elapsed since the timer 14 was started.
  • the counting unit 13 counts the number of executions of the moving operation of its own wireless terminal device 202. Specifically, for example, when the wireless terminal device 202 is in a connection established state, the counting unit 13 counts the number of times the RRC connection reconfiguration instruction is received from the wireless base station device 101 that is the communication connection destination according to the count criterion. To do. Details of the count reference will be described later.
  • the counting unit 13 counts the number of times that the attach process, which is a terminal registration process, is executed according to the count standard.
  • the counting unit 13 acquires a count reference from the radio base station apparatus 101, for example.
  • the count reference is included in an RRC connection reconfiguration instruction including broadcast information or mobility control information (MobilityControlInfo) transmitted by the radio base station apparatus 101, for example.
  • the RRC connection reconfiguration instruction including mobility control information is also referred to as a handover command.
  • the counting unit 13 acquires a count reference from the broadcast information received from the radio base station apparatus 101 or the handover command. Further, the count reference may be held in advance by the wireless terminal device 202, for example.
  • the counting unit 13 excludes the movement operation that satisfies the predetermined condition from the count target.
  • the count unit 13 determines whether or not the predetermined condition is satisfied based on information acquired from the radio base station apparatus 101.
  • the count unit 13 receives, for example, broadcast information from the radio base station apparatus 101, and based on the received broadcast information, the source or destination radio base station apparatus is a pico base station, a femto base station, or the like. Determine if it is a small base station.
  • the counting unit 13 is based on information included in the received broadcast information and in which information on a small base station is described, for example, a small cell list, neighboring cell information, or SIB9 (SystemInformationBlockType9). Alternatively, it is determined whether the destination radio base station apparatus is a small base station.
  • the count unit 13 confirms the flag. It may be determined whether the radio base station apparatus 101 is a small base station.
  • the counting unit 13 determines that the predetermined condition is satisfied when the source or destination radio base station apparatus 101 after completion of the movement operation is a small base station.
  • the counting unit 13 has a predetermined residence time from when the wireless terminal device 202 moves to the wireless base station device 101 until the moving operation to another wireless base station device 101 is performed. If it is less than the threshold value, it is determined that the predetermined condition is satisfied, and the moving operation is excluded from the count target.
  • the count unit 13 sets a measurement time corresponding to the predetermined threshold value in the timer after the movement operation is completed. Then, the count unit 13 confirms whether or not the timer 14 has expired when the next movement operation occurs.
  • the counting unit 13 corresponds to the stay time corresponding to the predetermined threshold. It is determined that the value is less than the value to be counted, and the moving operation is excluded from the count target.
  • the counting unit 13 determines that the predetermined condition is satisfied when a moving operation from another wireless base station device 101 to the small base station is performed, and the moving operation is performed. Are excluded from the count.
  • the counting unit 13 determines that the predetermined condition is satisfied when the mobile terminal device 202 moves from a small base station to another wireless base station device 101, and the mobile operation is performed. Are excluded from the count.
  • the counting unit 13 performs a movement operation from the macro base station of its own radio terminal apparatus 202 to another radio base station apparatus 101 or from another radio base station apparatus 101 to the macro base station. Therefore, it is determined that the predetermined condition is not satisfied, and the moving operation is counted.
  • the base station type determination unit 15 moves the source or destination radio base station apparatus 101 in the movement operation. The type of is determined.
  • the base station type determination unit 15 acquires the reference signal power (referenceSignalPower) of PDSCH (Physical Downlink Shared Shared CHannel) -Config in RRC information (Radio Resource Control Information Information Elements) included in the broadcast information.
  • referenceSignalPower the reference signal power of PDSCH (Physical Downlink Shared Shared CHannel) -Config in RRC information (Radio Resource Control Information Information Elements) included in the broadcast information.
  • the size of a macro cell formed by a macro base station is several hundred meters to several tens of kilometers, and the size of a cell formed by a small base station such as a pico base station or a femto base station is 10 to 200 m. This is because the transmission power of the radio signal transmitted from the macro base station and the transmission power of the radio signal transmitted from the small base station are greatly different.
  • the base station type determination unit 15 can determine the type of the radio base station apparatus 101 based on the acquired reference signal power.
  • the base station type determination unit 15 notifies the counting unit 13 of the determined type of the radio base station apparatus 101.
  • Specific types are, for example, small base stations and macro base stations.
  • the count part 13 judges whether the said predetermined conditions are satisfy
  • the count unit 13 acquires the type of the wireless base station device 101 that is the movement source or the movement destination from the base station type determination unit 15 after the movement operation is completed.
  • the counting unit 13 determines that the predetermined condition is satisfied, and excludes the moving operation from the count target.
  • the movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions of the movement operation counted by the counting unit 13.
  • the movement state estimation unit 12 sets the t-Evaluation of the movement state parameter included in the RRC connection reconfiguration instruction received in the handover operation to the measurement time of the timer 14 and starts the timer 14. At this time, the movement state estimation unit 12 resets the number of executions of the movement operation measured by the counting unit 13 to zero.
  • the movement state estimation unit 12 monitors the number of executions of the movement operation measured by the count unit 13 until the timer 14 expires after the timer 14 is started.
  • the movement state estimation unit 12 sets the movement state of its own wireless terminal device 202 to, for example, one of a high-speed movement state, a medium-speed movement state, and a normal movement state based on the number of executions.
  • the movement state estimation unit 12 transmits the set movement state of the wireless terminal device 202 to the wireless base station device 101 via the notification unit 17.
  • the setting unit 11 Based on the movement state estimated by the movement state estimation unit 12, the setting unit 11 affects the setting of the wireless terminal device 202 related to the execution determination of the movement operation of the wireless terminal device 202, that is, the execution determination.
  • the wireless terminal device 202 is set up.
  • the setting unit 11 performs the following processing when the wireless terminal device 202 is in an idle state. That is, the setting unit 11 changes the scale factor to be added to Qhyst that affects the execution determination of the cell reselection operation to another radio base station apparatus 101, for example, according to the movement state of its own radio terminal apparatus 202. .
  • the setting unit 11 determines whether to execute the handover operation of the wireless terminal device 202 based on the moving state estimated by the moving state estimating unit 12.
  • the setting related to the operation of the own wireless terminal device 202 concerned that is, the setting related to the operation of the own wireless terminal device 202 that affects the execution determination is performed.
  • the setting unit 11 changes the scale factor multiplied by the TTT that affects the timing of the handover operation, for example, according to the movement state of the own wireless terminal device 202.
  • the setting unit 11 sets the value of TTT by, for example, multiplying the TTT held by its own wireless terminal device 202 by the changed scale factor, and outputs the set TTT to the received power measuring unit 16.
  • the reception power measurement unit 16 when the reception power measurement unit 16 receives a measurement start request from a serving base station that is a radio base station device 101 that is in a connection established state with its own wireless terminal device 202, the reception power measurement unit 16 obtains neighboring cell information included in the received measurement start request. refer.
  • the received power measurement unit 16 specifies the transmission frequency of the radio base station apparatus 101 to be measured including the serving base station based on the neighboring cell information, and transmits from the radio base station apparatus 101 to be the measurement target.
  • the reception power of the radio signal having the transmission frequency is measured.
  • the received power measurement unit 16 performs the following processing.
  • the received power measuring unit 16 The wireless terminal device 202 is shifted to the report on state.
  • the received power measuring unit 16 sets the TTT received from the setting unit 11 as the measurement time of the timer 14 and starts the timer 14. Then, the received power measuring unit 16 monitors the received power of radio signals transmitted by the other radio base station apparatus 101 and the serving base station.
  • the reception power measuring unit 16 may set the offset OST1 and the hysteresis HS in the reception power of the radio signal transmitted by the serving base station.
  • the received power measuring unit 16 may set the offset OST2 in the received power of the radio signal transmitted by the other radio base station apparatus 101.
  • the reception power measuring unit 16 starts the timer 14 when the reception power of the radio signal transmitted by the other radio base station apparatus 101 is greater than the reception power of the radio signal transmitted by the serving base station, for example. If the timer 14 continues until the timer 14 expires, the following processing is performed.
  • the reception power measurement unit 16 outputs a measurement result notification, that is, a measurement report indicating the reception power of the radio signal transmitted from the radio base station apparatus 101 to be measured to the notification unit 17.
  • the notification unit 17 When the notification unit 17 receives the measurement report from the reception power measurement unit 16, the notification unit 17 transmits the received measurement report to the serving base station via the transmission signal processing unit 87. At this time, the notification unit 17 may include the movement state of the own wireless terminal device 202 received from the movement state estimation unit 12 in the measurement report.
  • the measurement report is used in the serving base station to determine whether or not to perform handover of the wireless terminal device 202 that has transmitted the measurement report.
  • FIG. 30 is a diagram illustrating the configuration of the radio base station apparatus according to the embodiment of the present invention.
  • radio base station apparatus (communication control apparatus) 101 includes an antenna 91, a circulator 92, a radio reception unit 93, a radio transmission unit 94, a signal processing unit 95, and a control unit 98.
  • the signal processing unit 95 includes a reception signal processing unit 96 and a transmission signal processing unit 97.
  • the signal processing unit 95 and the control unit 98 are realized by a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).
  • CPU Central Processing Unit
  • DSP Digital Signal Processor
  • the circulator 92 outputs the radio signal from the radio terminal device 202 received by the antenna 91 to the radio reception unit 93 and outputs the radio signal received from the radio transmission unit 94 to the antenna 91.
  • the radio reception unit 93 converts the frequency of the radio signal received from the circulator 92 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency converted signal into a digital signal, and outputs the digital signal to the reception signal processing unit 96.
  • IF Intermediate Frequency
  • the reception signal processing unit 96 performs signal processing such as despreading in a CDMA (Code Division Multiple Access) system on the digital signal received from the wireless reception unit 93, and performs part or all of the digital signal after the signal processing.
  • the data is converted into a predetermined frame format and transmitted to the core network 301 side.
  • the transmission signal processing unit 97 performs IFFT (Inverse Fast Fourier Transform) in an OFDM (Orthogonal Frequency Division Multiplex) method for communication data obtained by converting communication data received from the core network 301 side into a predetermined frame format or communication data generated by itself. ) And the like, and the digital signal after this signal processing is output to the wireless transmission unit 94.
  • IFFT Inverse Fast Fourier Transform
  • OFDM Orthogonal Frequency Division Multiplex
  • the wireless transmission unit 94 converts the digital signal received from the transmission signal processing unit 97 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs the converted signal to the circulator 92.
  • the control unit 98 exchanges various types of information with each unit in the radio base station apparatus 101, the other radio base station apparatus 101, and the core network 301.
  • FIG. 31 is a diagram showing a configuration of a control unit in the radio base station apparatus according to the embodiment of the present invention.
  • control unit 98 includes base station detection unit (count reference creation unit) 21, count method list creation unit (count reference creation unit) 22, and count method list notification unit (count reference notification unit). 23.
  • FIG. 32 is a diagram showing an example of a count method list in the wireless communication system according to the embodiment of the present invention.
  • FIG. 33 is a diagram showing another example of the count method list in the wireless communication system according to the embodiment of the present invention.
  • the base station detection unit 21 detects the establishment of a communication connection with the peripheral base station via the X2 interface, for example, when the peripheral base station in a dormant state is started, the base station detection unit 21 counts the ID of the peripheral base station. Output to the creation unit 22.
  • the count method list creating unit 22 When the count method list creating unit 22 receives the detected ID of the radio base station apparatus 101 from the base station detecting unit 21, the count method list creating unit 22 updates the count method list indicating the count reference based on the received ID.
  • the count reference is specifically “count object” or “weighting coefficient” included in the count method list.
  • the count method list 41 shown in FIG. 32A shows, for example, the correspondence between “ID” of the radio base station apparatus 101 and “count target”.
  • Counter target indicates a criterion as to whether or not the movement operation to the radio base station apparatus 101 indicated by the ID should be counted as the number of executions of the movement operation.
  • the radio base station apparatus 101 with “ID” 1, 3, 10 and 25 shown in (A) of FIG. 32 has a corresponding “count object” and is moved to the radio base station apparatus 101.
  • the operation indicates a movement operation that is to be counted for the number of executions of the movement operation.
  • the movement operation to the radio base station apparatus 101 is This indicates that the movement operation should not be counted for the number of executions of the movement operation.
  • count target indicates a count reference as to whether or not the number of executions of the movement operation should be counted.
  • the counting method list 42 shown in FIG. 33A shows, for example, a correspondence relationship between “ID” of the radio base station apparatus 101 and “weighting coefficient”.
  • the “weighting coefficient” specifically indicates a coefficient given to each radio base station apparatus 101 according to the type of the radio base station apparatus 101. For example, when the wireless terminal device 202 performs a moving operation to the wireless base station device 101, by multiplying the count value when the wireless terminal device 202 counts the number of execution times of the moving operation by the coefficient, The moving operation is weighted.
  • the radio base station apparatus 101 having “ID” of 1, 3, 10 and 25 has all corresponding “weighting coefficients” of 1.0.
  • the count value to be counted as the number of execution times of the movement operation is 1.
  • the radio base station apparatus 101 with “ID” of 32 and 79 has all corresponding “weighting coefficients” of 0.5.
  • the count value to be counted as the number of executions of the movement operation is 0.5.
  • the value indicated by the “weighting coefficient” indicates the count reference of the count value to be counted as the number of times of movement operation.
  • counting method list creation unit 22 when counting method list creation unit 22 receives the detected ID of radio base station apparatus 101 from base station detection unit 21, based on the ID, count method list creation unit 22 performs radio base station apparatus 101. Specify the type of.
  • the count method list creation unit 22 adds “true” as a count target to the count method list 41 together with the ID, and the identified type is a small base station. If there is, “false” is added to the count method list 41 along with the ID as a count target.
  • the count method list creation unit 22 adds “1.0” as a weighting coefficient to the count method list 42 together with the ID, and the identified type is a small base. In the case of a station, “0.5” may be added to the counting method list 41 together with the ID as a weighting coefficient.
  • the counting method list creating unit 22 outputs the counting method list 41 or 42 updated by adding the counting target or the weighting coefficient to the counting method list notifying unit 23.
  • the count method list creation unit 22 may create a new count method list when the count method list 41 or 42 to be updated is not held.
  • the count method list creating unit 22 may output the acquired count method list 41 or 42 to the count method list notifying unit 23. Good.
  • the count method list creation unit 22 counts the count method list 43 indicating the correspondence between the type of the radio base station apparatus 101 and the count target of the radio base station apparatus 101, for example, as illustrated in FIG. May be created.
  • count method list creating unit 22 for example, as shown in FIG. 33B, a count method list 44 showing the correspondence between the type of the radio base station apparatus 101 and the weighting coefficient of the radio base station apparatus 101. May be created.
  • the counting method list creation unit 22 outputs the created counting method list 43 or 44 to the counting method list notification unit 23.
  • the count method list notifying unit 23 When the count method list notifying unit 23 receives the count method list 41, 42, 43, or 44 from the count method list creating unit 22, the count method list notifying unit 23 sends part or all of the received count method list 41, 42, 43, or 44 to another Transmit to the radio base station apparatus 101 or the radio terminal apparatus 202.
  • the counting method list notifying unit 23 is located in a cell formed by its own radio base station apparatus 101 when, for example, its own radio base station apparatus 101 is a macro base station or a management base station described later.
  • the count method list 41, 42, 43, or 44 is transmitted to the small base station and the radio base station apparatus 101 that forms a cell adjacent to the cell formed by the own radio base station apparatus 101.
  • the count method list notifying unit 23 includes, for example, the count method list 41, 42, 43, or 44 in the broadcast information transmitted by the own radio base station apparatus 101, thereby forming a cell formed by the own radio base station apparatus 101.
  • the count method list 41, 42, 43, or 44 is transmitted via the transmission signal processing unit 97 to the wireless terminal device 202 located in
  • the count method list notifying unit 23 includes information included in the count method list 41 or 42 in, for example, neighboring cell information. Specifically, the count method list notifying unit 23 specifies the count target or the value of the weighting coefficient corresponding to the cell ID included in the neighboring cell information in the count method list 41 or 42.
  • the count method list notifying unit 23 includes the specified count target or the value of the weighting coefficient in the neighboring cell information in association with the cell ID.
  • the counting method list notifying unit 23 includes, for example, the neighboring cell information in the broadcast information transmitted by the own radio base station apparatus 101, thereby allowing the radio terminal located in the cell formed by the own radio base station apparatus 101 Information included in the count method list 41 or 42 is transmitted to the device 202 via the transmission signal processing unit 97.
  • the counting method list notifying unit 23 performs the following processing when the radio base station apparatus 101 hands over the radio terminal apparatus 202 that is in a connection established state with the radio base station apparatus 101.
  • the count method list notifying unit 23 refers to the count method list 41 or 42 to determine the count target or the weighting coefficient value corresponding to the ID of the radio base station device 101 that is the handover destination of the radio terminal device 202. Identify.
  • the count method list notifying unit 23 includes the specified count object or the value of the weighting factor in the RRC connection reconfiguration instruction that is a handover command transmitted to the wireless terminal device 202 via the transmission signal processing unit 97, for example.
  • the wireless terminal device 202 can count the number of executions of the moving operation based on the count target or the value of the weighting coefficient included in the received RRC connection reconfiguration instruction. .
  • the counting method list notifying unit 23 transmits the correspondence between the ID of the radio base station apparatus 101 and the type of the radio base station apparatus 101 shown in (C) of FIG. It may be included in the broadcast information to be transmitted to the wireless terminal device 202.
  • the wireless terminal device 202 counts by referring to the counting method list 43 shown in FIG. 32B received from the wireless base station device 101 and the correspondence between the ID and type shown in FIG. Based on the object, it is possible to count the number of executions of the movement operation.
  • the wireless terminal device 202 shows the correspondence between the counting method list 44 shown in FIG. 33B and the ID and type shown in FIG. 32C received from one or a plurality of wireless base station devices 101. By referring, it is possible to count the number of executions of the movement operation based on the weighting coefficient.
  • FIG. 34 is a diagram illustrating an example of a movement route of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
  • radio base station apparatuses 101A and 101B are macro base stations, for example, and form macro cells MCA and MCB, respectively.
  • Radio base station apparatuses 101D and 101E are pico base stations, for example.
  • the radio base station apparatus 101D is in an active state, and forms a picocell PCD by transmitting a radio signal.
  • the pico cell PCD is included in the macro cell MCA.
  • the radio base station apparatus 101E is in a dormant state and does not transmit a radio signal. Further, when the radio base station apparatus 101E transitions to an active state, for example, a picocell PCE is formed.
  • the pico cell PCE is included in the macro cell MCA and does not overlap the pico cell PCD.
  • the neighboring cell of the pico cell PCD is only the macro cell MCA.
  • the information regarding inappropriate handover that can be obtained by the radio base station apparatus 101D is only information regarding inappropriate handover related to the pico cell PCD and the macro cell MCA.
  • the neighboring cell of the pico cell PCE is only the macro cell MCA.
  • the information regarding inappropriate handover that can be obtained by the radio base station apparatus 101E is only information regarding inappropriate handover related to the pico cell PCE and the macro cell MCA.
  • the neighboring cells of the macro cell MCA are the pico cell PCD, the pico cell PCE, and the macro cell MCB.
  • the information on the improper handover that can be obtained by the radio base station apparatus 101A includes improper handover related to the picocell PCD and the macrocell MCA, improper handover related to the picocell PCE and the macrocell MCA, And information regarding inappropriate handover related to the macro cell MCB and the macro cell MCA.
  • the radio base station apparatus 101A which is a macro base station, manages at least a small base station located in a cell formed by itself. Management in this case means setting a count reference for each radio base station apparatus 101 and notifying the small base station of a count method list including the set count reference.
  • the radio base station apparatus 101 that manages the other radio base station apparatus 101 is referred to as a management base station.
  • the other radio base station apparatus 101 managed by the radio base station apparatus 101 is referred to as a managed base station.
  • the radio base station apparatus 101 may determine whether it should be a management base station or a managed base station using the following criteria. That is, the radio base station apparatus 101 determines whether it is a managed base station or a managed base station based on the density of the number of installed radio base station apparatuses 101 in the cell formed by itself.
  • the radio base station apparatus 101 estimates the size of the cell formed by itself based on its own transmission power, and also includes the radio base station included in the cell based on the number of neighboring base stations. The number of devices 101 is estimated.
  • the radio base station apparatus 101 can estimate the density of the number of installed radio base station apparatuses 101 in the cell formed by itself.
  • the radio base station apparatus 101 determines that it should operate as a management base station, for example, when the density of the number of installed radio base station apparatuses 101 in a cell formed by itself is larger than a predetermined threshold value. For example, when the density of the number of installed wireless base station devices 101 in a cell formed by the wireless base station device 101 is smaller than a predetermined threshold value, the wireless base station device 101 determines that it should operate as a managed base station.
  • the wireless base station device 101A is a management base station, and the wireless base station device 101D and the wireless base station device 101E are managed base stations of the wireless base station device 101A.
  • the radio base station apparatus 101B is one of the peripheral base stations of the radio base station apparatus 101A.
  • FIG. 35 is a diagram showing an example of a sequence of count method list update processing and count reference notification processing to the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
  • wireless terminal apparatus 202A is in a connection established state with wireless base station apparatus 101D at point S in picocell PCD, for example.
  • the operations of the wireless terminal device 202A, the wireless base station device 101A, the wireless base station device 101D, the wireless base station device 101E, and the wireless base station device 101B will be described with reference to FIGS. 34 and 35 as appropriate.
  • the radio base station apparatus 101E transitions from a dormant state to an active state and starts transmitting a radio signal (step S752).
  • Radio base station apparatus 101E forms a picocell PCE as shown in FIG. 34 by transmitting a radio signal.
  • the radio base station apparatus 101E establishes a communication connection via the X2 interface, for example, with the radio base station apparatus 101A forming the macro cell MCA adjacent to the pico cell PCE formed by itself (step S754).
  • the wireless base station device 101A which is a management base station, detects establishment of a communication connection with the wireless base station device 101E via the X2 interface
  • the wireless base station device 101A performs the following processing. That is, the radio base station apparatus 101A recognizes that the radio base station apparatus 101E, which is a managed base station that has been in the dormant state, has transitioned to the active state, and corresponds to the ID of the radio base station apparatus 101E and the ID, for example.
  • the count method list is updated (step S756). Details of the updating process of the count method list by the management base station will be described later.
  • the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101E that is a managed base station (step S758).
  • the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101D that is a managed base station (step S760).
  • the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101B (step S762).
  • the radio base station apparatus 101D transmits a count reference to the radio terminal apparatus 202A located in the picocell PCD formed by itself (step S764). Details of count-based transmission processing by the unmanaged base station will be described later.
  • the wireless terminal device 202A receives the count reference from the wireless base station device 101D in a connection established state with itself, and then moves from the point S located in the pico cell PCD to the point M located in the macro cell MCA. Start (step S766).
  • a handover operation is performed in the area AD1, and the connection destination of the wireless terminal device 202A is changed from the wireless base station device 101D to the wireless base station device 101A (step S768).
  • the wireless terminal device 202A counts the number of executions of the movement operation based on the count reference received from the wireless base station device 101D (step S770).
  • the wireless terminal device 202A when the wireless terminal device 202A arrives at the point M located in the macro cell MCA, the wireless terminal device 202A starts moving toward the point E located in the pico cell PCE (step S772). Further, the radio terminal apparatus 202A may receive the count reference from the radio base station apparatus 101A in the macro cell MCA.
  • a handover operation is performed in the area AE1, and the connection destination of the wireless terminal device 202A is changed from the wireless base station device 101A to the wireless base station device 101E (step S774).
  • the wireless terminal device 202A counts the number of executions of the moving operation based on the count reference received from the wireless base station device 101D or the wireless base station device 101A (step S776).
  • the wireless terminal device 202A arrives at a point E located in the picocell PCE.
  • the count method list update process and the count reference notification process to the wireless terminal device are completed.
  • FIG. 36 is a flowchart defining an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention.
  • radio base station apparatus 101A which is the management base station that performs the updating process of the count method list, shown in FIG. 35, and corresponds to the operations from step S754 to S762 in FIG.
  • radio base station apparatus 101A communicates with radio base station apparatus 101 via the X2 interface, which is generated, for example, when radio base station apparatus 101 transitions from a dormant state to an active state. Connection establishment is monitored (step S802).
  • step S802 when the wireless base station device 101A detects establishment of a communication connection with the wireless base station device 101 via the X2 interface (YES in step S802), whether the wireless base station device 101 is a small base station or not. It is determined whether or not (step S804).
  • the radio base station apparatus 101A determines that the radio base station apparatus 101 is not a small base station (NO in step S804), for example, as illustrated in FIG. 1.0, which is a weighting coefficient indicating the ID and the count reference corresponding to the ID, is added to the count method list 42 (step S806).
  • the radio base station apparatus 101A determines that the radio base station apparatus 101 is a small base station (YES in step S804), for example, as shown in FIG. 0.5, which is a weighting coefficient indicating the ID and the count reference corresponding to the ID, is added to the count method list 42 (step S808).
  • the wireless base station device 101A transmits the count method list to peripheral base stations located in the vicinity of the base station including the managed base station, for example, by referring to the peripheral cell information (step S810).
  • step S806 the radio base station apparatus 101A does not select the weighting coefficient corresponding to the ID of the radio base station apparatus 101, but the count target corresponding to the ID, for example, as illustrated in FIG. “True” shown may be added to the counting method list 41.
  • step S808 the radio base station apparatus 101A determines not the weighting coefficient corresponding to the ID of the radio base station apparatus 101, but the count target corresponding to the ID, for example, as illustrated in FIG. “False” shown may be added to the counting method list 41.
  • the wireless base station device 101A which is a management base station, deletes information about the other wireless base station device 101 from the count method list when, for example, the other wireless base station device 101 transitions from the active state to the dormant state. By doing so, the count method list may be updated. Details of the process will be described below.
  • FIG. 37 is a flowchart defining another example of the operation procedure when the radio base station apparatus performs the count method list update process in the radio communication system according to the embodiment of the present invention.
  • radio base station apparatus 101A establishes communication connection with radio base station apparatus 101 via the X2 interface, for example, when radio base station apparatus 101 transitions from an active state to a dormant state.
  • the disconnection is monitored (step S832).
  • the wireless base station device 101A detects disconnection of the communication connection with the wireless base station device 101 via the X2 interface (YES in step S832), the wireless base station device 101A specifies the ID of the wireless base station device 101 (step S832). S834).
  • the radio base station apparatus 101A refers to the counting method list 42 shown in FIG. 33A, identifies, for example, the item corresponding to the ID, and deletes the identified item from the counting method list 42 ( Step S836).
  • the wireless base station device 101A transmits the count method list to peripheral base stations located in the vicinity of the base station including the managed base station, for example, by referring to the peripheral cell information (step S838).
  • the radio base station apparatus 101A is not the item corresponding to the ID of the radio base station apparatus 101 in the count method list 42, but the ID in the count method list 41 illustrated in FIG. The item corresponding to may be deleted from the counting method list 41.
  • FIG. 38 is a flowchart defining an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
  • the following is a detailed operation when the radio base station apparatus 101D, which is the managed base station shown in FIG. 35, notifies the radio terminal apparatus 202A of the count reference, and corresponds to the operations in steps S760 and S764 in FIG. .
  • radio base station apparatus 101D receives count method list 41, 42, 43, or 44 from radio base station apparatus 101A that is a management base station, for example, and receives count method list 41, 42 , 43 or 44 are held (step S852).
  • the radio base station apparatus 101D transmits, for example, broadcast information including the count method list 41, 42, 43, or 44 held therein to the radio terminal apparatus 202 located in the cell formed by itself.
  • the count method list 41, 42, 43 or 44 is transmitted (step S854).
  • the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
  • step S854 the radio base station apparatus 101D transmits broadcast information including the count method list 41, 42, 43, or 44. Since the broadcast information is transmitted by broadcast, all the wireless terminal devices 202 located in the cell formed by the wireless base station device 101D can receive the count method list.
  • the wireless base station device 101D uses the counting reference included in the counting method list 41, 42, 43, or 44 as the wireless terminal device. 202 can be notified efficiently.
  • the radio base station device 101A which is a managed base station, transmits notifying information including the count method list 41, 42, 43, or 44 to the radio terminal device 202, not the radio base station device 101D that is a managed base station. May be.
  • FIG. 39 is a flowchart defining another example of the operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
  • the following is a detailed operation when the radio base station apparatus 101D, which is the managed base station shown in FIG. 35, notifies the radio terminal apparatus 202A of the count reference, and corresponds to the operations in steps S760 and S764 in FIG. .
  • radio base station apparatus 101D receives count method list 41, 42, 43, or 44 from radio base station apparatus 101A that is a management base station, for example, and receives count method list 41, 42 received. , 43 or 44 are held (step S872).
  • the radio base station apparatus 101D refers to the neighboring cell information and acquires a cell ID included in the neighboring cell information (step S874).
  • the radio base station apparatus 101D refers to the held count method list 41, 42, 43, or 44, and specifies the count reference corresponding to the acquired cell ID (step S876).
  • the radio base station apparatus 101D includes the specified count reference in the neighboring cell information in association with the cell ID (step S878).
  • the wireless base station device 101D transmits the neighboring cell information to the wireless terminal device 202 located in the cell formed by the wireless base station device 101D, for example, by transmitting broadcast information including the neighboring cell information (step S880). ).
  • the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
  • step S880 the radio base station apparatus 101D transmits broadcast information including neighboring cell information including the count reference. Since the broadcast information is transmitted by broadcast, all the wireless terminal devices 202 existing in the cell formed by the wireless base station device 101D can receive the neighboring cell information.
  • the radio base station apparatus 101D efficiently notifies the radio terminal apparatus 202 of the count reference included in the neighboring cell information when the number of radio terminal apparatuses 202 located in the cell formed by the radio base station apparatus 101D is large. can do.
  • the radio base station apparatus 101A which is a managed base station, for example, the radio base station apparatus 101A, which is a managed base station, counts the radio terminal apparatus 202 by including neighboring cell information including a count reference in the broadcast information. A reference may be sent.
  • FIG. 40 is a flowchart defining another example of the operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
  • radio base station apparatus 101D receives count method list 41, 42, 43 or 44 from radio base station apparatus 101A which is a management base station, for example, and receives count method list 41, 42 received. , 43 or 44 are held (step S902).
  • the radio base station apparatus 101D receives from the radio terminal apparatus 202 a measurement result notification indicating the measurement result of the received power measured by the radio terminal apparatus 202 in a connection established state with itself (step S904).
  • the wireless base station device 101D determines whether or not the wireless terminal device 202A should be handed over (step S906).
  • the radio base station apparatus 101D determines that the radio terminal apparatus 202A should not be handed over (NO in step S906), the radio base station apparatus 101D continues to receive a measurement result notification from the radio terminal apparatus 202 (step S904).
  • the radio base station apparatus 101D determines that the handover of the radio terminal apparatus 202A should be performed (YES in step S906), for example, the radio base station apparatus 101A is determined as a handover destination with reference to neighboring cell information, The following processing is performed.
  • the radio base station apparatus 101D refers to the count method list 41, 42, 43, or 44 that is held, and specifies the count reference corresponding to the ID of the handover destination radio base station apparatus 101A (step S908).
  • the radio base station apparatus 101D transmits a handover request indicating the radio base station apparatus 101A to the radio base station apparatus 101A via the X2 interface which is an inter-base station interface (step S910).
  • the radio base station apparatus 101D stands by until a handover response, which is a response to the handover request, is received from the radio base station apparatus 101A (NO in step S912).
  • the radio base station apparatus 101D receives a handover response from the radio base station apparatus 101A (YES in step S912), the radio base station apparatus 101D sends an RRC connection reconfiguration instruction that is a handover command including the specified count reference to the radio terminal apparatus 202A. (Step S914).
  • the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
  • the radio base station apparatus 101D transmits broadcast information including the count method list 41, 42, 43 or 44, or neighboring cell information
  • the amount of broadcast information to be transmitted becomes large.
  • the burden of the broadcast information transmission process in the radio base station apparatus 101D and the broadcast information reception process in the radio terminal apparatus 202 located in the cell formed by the radio base station apparatus 101D becomes heavy. This is not preferable when the number of wireless terminal devices 202 located in the area is small.
  • step S914 the radio base station apparatus 101D transmits a handover command including a count reference to the radio terminal apparatus 202 that is a handover target.
  • the radio base station apparatus 101D sets the count reference for the radio terminal apparatus 202 when the number of radio terminal apparatuses 202 existing in the cell formed by the radio base station apparatus D is small, that is, when the number of occurrences of the handover operation is small. Notification can be made efficiently.
  • FIG. 41 is a sequence diagram showing an example of a moving state update operation performed by the wireless terminal device after completion of the cell reselection operation in the wireless communication system according to the embodiment of the present invention.
  • the wireless terminal device 202 is located in the cell CA, moves to the overlapping area of the cell CA and the cell CB after selecting the wireless base station device 101A as a communication partner.
  • the radio terminal apparatus 202 determines to newly select the radio base station apparatus 101A as a communication partner, the radio terminal apparatus 202 receives broadcast information transmitted from the radio base station apparatus 101A (step S401). ), The content of the received notification information is stored (step S402).
  • This broadcast information includes neighboring cell information and information for performing cell reselection.
  • step S403 to S412 are the same as the operations (steps S3 to S12) in the sequence diagram shown in FIG. 3, detailed description thereof will not be repeated here.
  • wireless terminal apparatus 202 updates its movement state according to the following operation procedure based on SIB (System Information Block) included in the broadcast information received from wireless base station apparatus 101A or wireless base station apparatus 101B. (Step S413).
  • SIB System Information Block
  • the wireless terminal device 202 updates the movement state after completion of the cell reselection operation.
  • FIG. 42 is a sequence diagram illustrating an example of a movement state update operation performed by the wireless terminal device after completion of the handover operation in the wireless communication system according to the embodiment of the present invention.
  • wireless terminal apparatus 202 moves from the state where it is located in cell CA and communicating with wireless base station apparatus 101A to the overlapping area of cell CA and cell CB.
  • the wireless terminal device 202 acquires broadcast information from the wireless base station device 101A.
  • radio base station apparatus 101A determines a frequency to be measured by radio terminal apparatus 202 that is communicating with itself, and another radio base station apparatus that transmits a radio signal of the frequency. It sets (step S431).
  • the wireless base station device 101A transmits to the wireless terminal device 202 a measurement start request for causing the wireless terminal device 202 to measure the reception level of the wireless signal transmitted from the other wireless base station device that has been set.
  • This measurement start request includes neighboring cell information, that is, the cell ID of the radio base station apparatus to be measured. Further, the measurement start request includes the transmission frequency of each radio base station device (step S432).
  • step S433 to S447 are the same as the operations (steps S33 to S47) in the sequence diagram shown in FIG. 4, detailed description thereof will not be repeated here.
  • the wireless terminal device 202 acquires broadcast information from the wireless base station device 101B (step S448).
  • the radio terminal apparatus 202 updates its movement state according to the following operation procedure (step S449).
  • the wireless terminal device 202 updates the movement state after the handover operation is completed.
  • the wireless terminal device 202 performs the movement state update operation in step S413 shown in FIG. 41 and step S449 shown in FIG. That is, the wireless terminal device 202 performs the movement state update operation after the movement operation is completed.
  • FIG. 43 is a flowchart defining an operation procedure when the wireless terminal device performs a movement state detection process and a setting process according to the movement state in the wireless communication system according to the embodiment of the present invention.
  • radio terminal apparatus 202 is in a state in which a mobile operation such as a handover operation or a cell reselection operation is completed, and serving base station 101 that is a radio base station apparatus 101 that is a communication connection destination after the mobile operation. Assume that the event A3 is set by the station (step S472).
  • the wireless terminal device 202 counts a count value CNT indicating the number of times of execution of the moving operation according to the count standard (step S474).
  • the wireless terminal device 202 estimates its movement state based on the count value CNT (step S476).
  • the wireless terminal device 202 adjusts the value of TTT by multiplying, for example, the TTT held by itself by a scale factor corresponding to the estimated movement state of itself (step S478).
  • the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the radio base station apparatus 101 including the serving base station based on the neighboring cell information (step S480).
  • the radio terminal apparatus 202 (step S1). The following processing is performed.
  • the wireless terminal device 202 transitions to the report-on state, and starts a timer whose measurement time is set to TTT (step S484).
  • the radio terminal apparatus 202 continuously measures the received power of the radio signal transmitted from the radio base station apparatus 101 (step S480).
  • wireless terminal apparatus 202 monitors the received power until the time corresponding to TTT elapses (NO in step S488) when the received power T1 is greater than received power S1 (YES in step S486), and corresponds to TTT.
  • the elapsed time has elapsed (YES in step S488), the following processing is performed.
  • the wireless terminal device 202 transmits a measurement report, which is a measurement result notification indicating the received power of the wireless signal transmitted from the wireless base station device 101, to the serving base station (step S490).
  • radio terminal apparatus 202 transitions to a report off state and is transmitted from radio base station apparatus 101.
  • the reception power of the radio signal is continuously measured (step S480).
  • the wireless terminal device 202 sets the TTT based on its own movement state estimated after completion of the movement operation.
  • the wireless terminal apparatus 202 may use the count reference acquired from the wireless base station apparatus 101 in step S474, or may use a predetermined count reference held by itself. Details of the count process of the number of executions of the movement operation in step S474 will be described later.
  • step S476 the wireless terminal device 202 evaluates the number of executions of the moving operation in a time corresponding to, for example, t-Evaluation, and changes its own moving state to the normal moving state or the medium speed moving state according to the evaluation result. Or set to high-speed movement.
  • the wireless terminal apparatus 202 sets the TTT value in step S478. However, the wireless terminal apparatus 202 becomes a determination criterion when performing a cell reselection operation in an idle state, for example, according to the set movement state. You may perform the change process of the constant added to Qhyst which affects reception power.
  • the wireless terminal device 202 can adjust the likelihood of the cell reselection operation depending on the movement state of itself.
  • step S4708 the wireless terminal device 202 changes the following settings according to its movement state, thereby causing the timing of the handover operation in the connection establishment state or the occurrence of cell reselection in the idle state. The ease may be adjusted.
  • the wireless terminal device 202 estimates the moving state of the wireless terminal device 202 step by step, but may estimate the moving speed itself. For example, a frequency shift due to the Doppler effect generated when the moving wireless terminal device 202 receives a wireless signal transmitted by the wireless base station device 101, or a combination of GPS (Global Positioning System) and map information, etc. By using, the moving speed of the wireless terminal device 202 can be estimated.
  • GPS Global Positioning System
  • the wireless terminal device 202 may include the movement state estimated by itself in the measurement report that is the measurement result notification transmitted to the serving base station.
  • the serving base station can acquire a power change amount, which will be described later, based on the movement state received from the wireless terminal device 202.
  • FIG. 44 is a flowchart that defines an operation procedure when the wireless terminal device performs a movement state detection process and a notification process to the wireless base station apparatus of the movement state in the wireless communication system according to the embodiment of the present invention. is there.
  • radio terminal apparatus 202 is in a state where a movement operation such as a handover operation or a cell reselection operation is completed (step S492).
  • steps S494 to S496 are the same as those in the flowchart shown in FIG. 43 (steps S474 to S476), detailed description will not be repeated here.
  • the wireless terminal device 202 notifies the wireless base station device 101 of the estimated movement state of itself (step S498).
  • the wireless terminal device 202 notifies the wireless base station device 101 of its own movement state estimated after the completion of the movement operation.
  • the wireless terminal device 202 may use the count reference acquired from the wireless base station device 101 in step S494, or may use a predetermined count reference held by itself. Details of the count process of the number of executions of the movement operation in step S494 will be described later.
  • step S498 the wireless terminal apparatus 202 notifies the serving base station of the movement state by including the estimated movement state of the self in the measurement result notification transmitted to the serving base station in the connection established state with itself, for example. .
  • the serving base station estimates the moving speed of the wireless terminal device 202 by receiving the moving state from the wireless terminal device 202. Thereby, the serving base station changes the received power of the radio signal in the radio terminal device 202 located in the cell formed by its own radio base station device with respect to the position change of the radio terminal device 202 based on the moving speed.
  • the degree (hereinafter, also referred to as power change amount) can be acquired.
  • the serving base station performs control so that the timing of the handover operation is advanced when the power change amount of the wireless terminal device 202 is large, and the timing of the handover operation is delayed when the power change amount of the wireless terminal device 202 is small. Control to be.
  • the serving base station can optimize the timing of the handover operation, the occurrence of an inappropriate handover operation can be suppressed.
  • the wireless terminal apparatus 202 counts the number of executions of the movement operation according to the count standard. The count process performed by the wireless terminal device 202 will be described below.
  • FIG. 45 is a flowchart defining an operation procedure when the wireless terminal device counts the number of executions of the moving operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 broadcasts from the movement-source radio base station apparatus 101 or the movement-destination radio base station apparatus 101 after the movement operation such as the handover operation or the cell reselection operation is completed. Information is acquired (step S514).
  • the wireless terminal device 202 determines that the movement-source wireless base station device 101 is a small base station based on the broadcast information, for example (YES in step S516), the wireless terminal device 202 counts the moving operation according to the count criterion. The count value CNT indicating the number of executions of the movement operation is not incremented (step S518).
  • the wireless terminal device 202 determines that the source wireless base station device 101 is not a small base station based on the broadcast information (NO in step S516), the wireless terminal device 202 performs the following processing.
  • the radio terminal apparatus 202 determines that the movement-destination radio base station apparatus 101 is a small base station based on the broadcast information (YES in step S520), the radio terminal apparatus 202 counts the movement operation according to the count criterion. The count value CNT is not incremented (step S518).
  • the wireless terminal device 202 determines that the movement-destination wireless base station device 101 is not a small base station based on the notification information (NO in step S520), the wireless terminal device 202 counts the movement operation according to the counting criterion. Then, the count value CNT is incremented (step S522).
  • the wireless terminal device 202 determines whether or not the moving operation is to be counted as the number of executions of the moving operation based on the notification information and the count reference.
  • step S514 the wireless terminal device 202 determines whether the source or destination wireless base station device is a small base station based on the notification information acquired after the completion of the moving operation. The above determination may be made using information already acquired before the moving operation.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. In this case, the wireless terminal device 202 adds 1.0 to the count value CNT in step S522, and adds 0.5 to the count value CNT in step S518.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • the wireless terminal device 202 may determine whether the source or destination wireless base station device is a small base station from the following information.
  • the wireless terminal device 202 acquires from the broadcast information, for example, a small cell list in which a cell ID of a small base station is described.
  • the wireless terminal device 202 can determine whether or not the source or destination wireless base station device is a small base station based on the acquired small cell list.
  • the wireless terminal device 202 acquires, for example, the neighboring cell information in which the cell ID of the small base station is described from the broadcast information.
  • the wireless terminal device 202 can determine whether or not the source or destination wireless base station device is a small base station based on the acquired neighboring cell information.
  • the information amount of the small cell list or neighboring cell information including the cell ID of the small base station becomes large.
  • the small cell list including the cell ID of the small base station or the neighboring cell information in the broadcast information is not preferable because the burden of the transmission processing and reception processing of the broadcast information increases.
  • a 1-bit flag indicating whether or not the radio base station apparatus 101 is a small base station may be included.
  • the wireless terminal device 202 can determine whether or not the serving base station is a small base station by referring to the 1-bit flag of the broadcast information acquired from the serving base station.
  • the radio terminal device 202 determines whether the target base station is a small base station by referring to the 1-bit flag of the broadcast information acquired from the serving base station after the moving operation. It can be determined whether the station is a small base station.
  • SIB9 SystemInformationBlockType9 including hnb-Name (home eNB Name), which is a small base station name, from broadcast information by referring to scheduling information in SIB1 (SystemInformationBlockType1), Processing may be performed.
  • SIB9 SystemInformationBlockType9
  • hnb-Name home eNB Name
  • SIB1 SystemInformationBlockType1
  • the wireless terminal device 202 compares the hnb-Name acquired from the SIB 9 with the name of the source or destination wireless base station device 101, so that the source or destination wireless base station device 101 is small. It can be determined whether it is a base station.
  • step S516 or S520 when the wireless terminal device 202 determines that the source or destination wireless base station device 101 is a small base station after completion of the moving operation (YES in step S516 or step S516).
  • step S520 YES
  • the movement operation is excluded from the count target according to the count criterion (Step S518).
  • the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
  • the wireless terminal device 202 determines whether or not the moving operation is to be counted for the number of executions of the moving operation based on the staying time in the cell located after the moving operation and the count reference. May be.
  • FIG. 46 is a flowchart that defines another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 sets a measurement time to a predetermined threshold value and starts a timer. It waits until the occurrence of a movement operation such as a handover operation or a cell reselection operation (NO in step S552).
  • step S552 when a moving operation occurs (YES in step S552), the wireless terminal device 202 checks whether the timer has expired (step S554).
  • step S554 when the timer has not expired, that is, when the time corresponding to the predetermined threshold has not elapsed since the timer was started (NO in step S554), the wireless terminal device 202 The moving operation is not counted and the count value CNT is not incremented (step S556).
  • the wireless terminal device 202 performs the moving operation according to the count criterion.
  • the count value CNT is incremented as a count target (step S558).
  • the wireless terminal device 202 sets the measurement time to a predetermined threshold value and resets the timer (step S560).
  • the wireless terminal device 202 determines whether or not the moving operation is to be counted based on the staying time and the count reference in the cell that is in the area after the moving operation is completed.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting criterion in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S558, and adds 0.5 to the count value CNT in step S556.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • step S552 when a mobile operation occurs (YES in step S552), the wireless terminal device 202 stays in a cell that has been in the area before the mobile operation based on whether or not the timer has expired in step S554. It is determined whether the time is longer or shorter than the time corresponding to the predetermined threshold value.
  • the time required for the wireless terminal device 202 to cross the cell is formed by the macro base station. Compared to the time required to cross a large cell.
  • the wireless terminal device 202 forms a cell located before the moving operation by the small base station. It is determined that there is a high possibility that the cell has been deleted.
  • the wireless terminal device 202 determines that the source wireless base station device 101 is likely to be a small base station, the wireless terminal device 202 does not count the moving operation in step S556. Can be prevented from being erroneously estimated to be a faster moving state than actual.
  • the wireless terminal device 202 counts the moving operation based on the type of the wireless base station device 101 that forms a cell that is in the area after the moving operation and the count reference. You may judge whether it makes object.
  • FIG. 47 is a flowchart defining another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • the following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG.
  • the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 is a small base station in which radio base station apparatus 101 that forms a cell that is in the area after the move operation after the move operation such as the handover operation or the cell reselection operation is completed. If there is (YES in step S594), the following processing is performed. That is, the wireless terminal device 202 does not count the movement operation according to the count criterion, and does not increment the count value CNT indicating the number of executions of the movement operation (step S596).
  • the wireless terminal device 202 counts the moving operation according to the count criterion. CNT is incremented (step S598).
  • the wireless terminal device 202 sets the moving operation as a target for counting the number of executions of the moving operation based on the type and the counting reference of the wireless base station device 101 that forms a cell that is located after the moving operation is completed. Determine whether to do.
  • step S594 when the radio terminal apparatus 202 determines that the radio base station apparatus 101 that forms a cell that is in the service area after completion of the movement operation is a small base station (YES in step S594), the radio terminal apparatus 202 performs the movement according to the count criterion. The operation is excluded from the count target (step S596).
  • the wireless terminal device 202 incorrectly estimates that its own moving state is a faster moving state than the actual moving state by not counting the moving operation to the cell formed by the small base station. Can be prevented.
  • the type of the movement-destination radio base station apparatus 101 may be acquired from the movement-source or movement-destination radio base station apparatus 101, or may be acquired from a radio base station apparatus other than the radio base station apparatus 101. May be. Further, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement destination in advance.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S598, and adds 0.5 to the count value CNT in step S596.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • the wireless terminal device 202 determines that the movement operation is performed based on the type and count reference of the wireless base station device 101 that forms a cell that was located before the movement operation after the movement operation is completed. It may be determined whether to count.
  • FIG. 48 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 forms a small base station after a mobile operation such as a handover operation or a cell reselection operation is completed. (YES in step S634), the following processing is performed. That is, the wireless terminal device 202 does not count the movement operation according to the count criterion and does not increment the count value CNT indicating the number of executions of the movement operation (step S636).
  • the wireless terminal device 202 counts the moving operation according to the count criterion.
  • the value CNT is incremented (step S638).
  • the wireless terminal device 202 determines whether or not the moving operation is to be counted for the number of executions of the moving operation on the basis of the type of the wireless base station device 101 that is the moving source and the count reference.
  • step S634 after the movement operation is completed, when the movement-source wireless base station device 101 is a small base station (YES in step S634), the wireless terminal device 202 does not count the movement operation (step S634). Step S636).
  • the wireless terminal device 202 incorrectly estimates that its own moving state is a faster moving state than the actual moving state by not counting the moving operation from the cell formed by the small base station. Can be prevented.
  • the type of the source radio base station apparatus 101 may be acquired from the source or destination radio base station apparatus 101, or may be acquired from another radio base station apparatus other than the radio base station apparatus 101. May be. Also, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement source in advance.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S638, and adds 0.5 to the count value CNT in step S636.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • the wireless terminal device 202 determines whether or not the wireless base station device 101 that forms a cell that is in the area before or after the moving operation is a macro base station after the moving operation is completed, and the count reference It may be determined whether or not the movement operation is to be counted as the number of executions of the movement operation.
  • FIG. 49 is a flowchart defining another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 is configured such that radio base station apparatus 101 that forms a cell in which the mobile terminal is located before the mobile operation after a mobile operation such as a handover operation or a cell reselection operation is completed. (YES in step S674), the following processing is performed. That is, the wireless terminal device 202 counts the movement operation according to the count criterion, and increments the count value CNT indicating the number of executions of the movement operation (step S676).
  • the radio terminal apparatus 202 performs the following processing.
  • the wireless terminal device 202 counts the moving operation according to the count criterion.
  • the value CNT is incremented (step S676).
  • the wireless terminal device 202 does not count the moving operation according to the count criterion.
  • the value CNT is not incremented (step S680).
  • the wireless terminal device 202 performs the moving operation based on whether or not the wireless base station device 101 that forms a cell that is located before or after the moving operation is a macro base station and the count reference. Whether or not to count the number of executions of the movement operation.
  • step S680 the wireless terminal device 202 does not count the movement operation other than the movement operation from the cell formed by the macro base station or the movement operation to the cell formed by the macro base station.
  • the wireless terminal device 202 does not count movement operations from a cell formed by a small base station to a cell formed by another small base station.
  • the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
  • the type of the movement-source or movement-destination radio base station apparatus 101 may be acquired from the movement-source or movement-destination radio base station apparatus 101, or another radio base station apparatus other than the radio base station apparatus 101 May be obtained from Further, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement source or the movement destination in advance.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S676, and adds 0.5 to the count value CNT in step S680.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • the wireless terminal device 202 after the completion of the moving operation, based on the transmission power of the wireless signal transmitted by the wireless base station device 101 that forms the cell that is in the area before or after the moving operation and the count criterion, It may be determined whether or not the movement operation is to be counted.
  • FIG. 50 is a flowchart that defines another example of an operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
  • radio terminal apparatus 202 broadcasts from the movement-source radio base station apparatus 101 or the movement-destination radio base station apparatus 101 after the movement operation such as the handover operation or the cell reselection operation is completed. Information is acquired (step S714).
  • the radio terminal device 202 acquires the transmission power of the radio signal transmitted from the source radio base station device 101 based on the broadcast information, for example.
  • the wireless terminal device 202 identifies the type of the wireless base station device 101 that is the movement source based on the transmission power (step S716).
  • the wireless terminal apparatus 202 determines that the type of the specified wireless base station apparatus 101 as the movement source is a small base station (YES in step S718), the wireless terminal apparatus 202 does not count the movement operation according to the count criterion.
  • the count value CNT indicating the number of executions of the movement operation is not incremented (step S720).
  • the wireless terminal device 202 determines that the identified type of the wireless base station device 101 of the movement source is not a small base station (NO in step S718), the wireless terminal device 202 performs the following processing.
  • the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted from the movement-destination radio base station apparatus 101 based on the notification information, for example.
  • the wireless terminal device 202 identifies the type of the movement-destination wireless base station device 101 based on the transmission power (step S722).
  • the wireless terminal apparatus 202 determines that the type of the specified destination wireless base station apparatus 101 is a small base station (YES in step S724), the wireless terminal apparatus 202 does not count the moving operation according to the count criterion.
  • the count value CNT is not incremented (step S720).
  • the wireless terminal device 202 determines that the type of the specified wireless base station device 101 as the movement destination is not a small base station (NO in step S724), the wireless terminal device 202 counts the movement operation according to the count criterion. CNT is incremented (step S726).
  • the wireless terminal device 202 is based on the transmission power and count reference of the wireless signal transmitted by the wireless base station device 101 that forms a cell before or after the moving operation after the moving operation is completed. Thus, it is determined whether or not the movement operation is to be counted.
  • step S716 the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted from the source radio base station apparatus 101 based on the broadcast information, for example.
  • the wireless terminal device 202 can determine whether or not the source wireless base station device 101 is a small base station based on the acquired transmission power of the wireless signal.
  • step S722 the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted by the movement-destination radio base station apparatus 101 based on the broadcast information, for example.
  • the wireless terminal device 202 can determine whether or not the destination wireless base station device 101 is a small base station based on the acquired transmission power of the wireless signal.
  • step S718 or S724 when the wireless terminal device 202 determines that the specified wireless base station device 101 that is the moving source or the moving destination is a small base station after the moving operation is completed (YES in step S718). Alternatively, YES in step S724), the moving operation is not counted according to the count standard (step S720).
  • the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
  • the wireless terminal device 202 determines whether or not the source or destination wireless base station device is a small base station based on the notification information acquired after the completion of the moving operation. The above determination may be made using information already acquired before the moving operation.
  • the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S726, and adds 0.5 to the count value CNT in step S720.
  • the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
  • the wireless terminal device 202 for example, based on the transmission power of the wireless signal transmitted by the wireless base station device 101, the received power of the measured wireless signal, and the stay time in the cell formed by the wireless base station device 101, It may be determined whether or not the movement operation to the cell and the movement operation from the cell are to be counted.
  • the wireless terminal device 202 monitors a power ratio that is a ratio of the received power to the transmitted power during the stay time, and based on the monitored power ratio, the wireless terminal device 202 moves near the center of the cell. Judge whether it passed.
  • the wireless terminal device 202 when the stay time is short and the wireless terminal device 202 passes near the center of the cell, the wireless terminal device 202 considers that it has moved the cell at high speed, and moves the moving operation to and from the cell. It is determined that the operation should be counted.
  • the wireless terminal device 202 when the stay time is short and the wireless terminal device 202 does not pass near the center of the cell, the wireless terminal device 202 considers that it has moved the end of the cell at a low speed, and moves to the cell and the cell. It is determined that the movement operation from is not to be counted.
  • the radio terminal device 202 determines that the cell based on the transmission power of the radio signal transmitted by the radio base station device 101, the reception power of the radio signal, and the stay time in the cell formed by the radio base station device 101. It is possible to appropriately determine whether or not the movement operation to and from the cell should be counted.
  • the wireless terminal device 202 transmits the stay time from one movement operation to the next movement operation, the type of the movement-source or movement-destination radio base station apparatus 101, and the movement-source or movement-destination radio base station apparatus 101. Whether or not the movement operation is to be counted may be determined based on a part or all combination with the transmission power of the radio signal to be transmitted.
  • the wireless terminal device 202 performs the number of executions of the moving operation based on the “count target” in the counting method list 41 of the wireless base station device 101 that forms a cell that is in the area after the moving operation after the moving operation is completed. In addition, it may be determined whether to count the movement operation.
  • FIG. 51 is a flowchart that defines another example of an operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions is counted based on the counting method list 41 shown in FIG.
  • the wireless terminal device 202 refers to the counting method list 41 after completing a moving operation such as a handover operation or a cell reselection operation, and forms a cell that is in the area after the moving operation.
  • the count target corresponding to the ID of the station apparatus 101 is acquired (step S924).
  • the wireless terminal device 202 sets the movement operation as a count target and increments a count value CNT indicating the number of executions of the movement operation (step S926). S930).
  • step S926 when the count target is “false” (NO in step S926), the wireless terminal device 202 does not count the movement operation and does not increment the count value CNT (step S928).
  • step S926 the wireless terminal device 202 determines whether the moving operation is to be counted based on the “count target” in the counting method list 41 acquired from the radio base station device 101. to decide.
  • the wireless terminal device 202 can count the number of executions of the movement operation based on the count target which is the count reference designated by the wireless base station device 101.
  • the wireless terminal device 202 counts the number of executions of the mobile operation based on the count reference created by the management base station that manages a plurality of small base stations installed in a wide area, for example.
  • the moving state can be estimated appropriately.
  • the wireless terminal device 202 may acquire the count reference from the count method list 41 included in the broadcast information, may be acquired from neighboring cell information included in the broadcast information, or may be acquired from a handover command. May be.
  • the wireless terminal device 202 executes the moving operation based on the “weighting coefficient” in the counting method list 42 of the wireless base station device 101 that forms a cell that is in the area after the moving operation after the moving operation is completed. The number of times may be counted.
  • FIG. 52 is a flowchart that defines another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
  • step S474 shown in FIG. 43 and step S494 shown in FIG. the wireless terminal device 202 assumes a situation in which the number of executions is counted based on the counting method list 42 shown in FIG.
  • radio terminal apparatus 202 refers to count method list 42 after a mobile operation such as a handover operation or a cell reselection operation is completed, and forms a cell that is in the area after the mobile operation.
  • a weighting coefficient corresponding to the ID of the station apparatus 101 is acquired (step S944).
  • the wireless terminal device 202 adds the weighting coefficient to the count value CNT indicating the number of executions of the movement operation (step S946).
  • step S946 the wireless terminal device 202 adds the “weighting coefficient” in the count method list acquired from the wireless base station device 101 to the number of executions of the movement operation.
  • the radio terminal apparatus 202 can count the number of times of the movement operation based on the weighting coefficient which is the count standard designated by the radio base station apparatus 101.
  • the wireless terminal device 202 counts the number of executions of the moving operation based on a count reference created by the management base station that manages the wide-area wireless base station device 101 including, for example, a plurality of macro base stations. Thus, it is possible to appropriately estimate its own movement state.
  • the radio terminal apparatus 202 may acquire the count reference from the count method list 42 included in the broadcast information, may be acquired from neighboring cell information included in the broadcast information, or may be acquired from a handover command. May be.
  • Non-Patent Document 1 By the way, when an inappropriate movement operation described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system.
  • the counting unit 13 counts the number of times that the wireless terminal device 202 executes the moving operation.
  • the movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. Then, the count unit 13 performs counting according to the count standard acquired from the radio base station apparatus 101.
  • the wireless terminal device 202 can perform counting according to the count reference acquired from the wireless base station device 101 that grasps a wide communication environment compared to the wireless terminal device 202. Can be estimated appropriately.
  • the wireless terminal device 202 can appropriately estimate its own moving state.
  • wireless terminal apparatus 202 can adjust the timing of a movement operation
  • the counting unit 13 weights the performed movement operation of the wireless terminal device 202 according to the counting standard, and performs the counting using the weighted value.
  • the counting unit 13 counts the number of times that the wireless terminal device 202 executes the moving operation.
  • the movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. Then, the count unit 13 weights the executed movement operation of the wireless terminal device 202 according to a predetermined count standard, and performs a count using the weighted value.
  • the wireless terminal device 202 can appropriately estimate its own moving state.
  • wireless terminal apparatus 202 can adjust the timing of a movement operation
  • the counting unit 13 moves the predetermined condition when the executed movement operation of the wireless terminal device 202 satisfies the predetermined condition according to the count criterion. Exclude actions from counting.
  • the radio terminal apparatus acquires the count reference included in the handover command received from the handover source radio base station apparatus 101 in the handover operation of its own radio terminal apparatus 202.
  • the radio base station apparatus 101 that is the handover source, when the number of radio terminal apparatuses 202 existing in the cell formed by the radio base station apparatus 101 is particularly small, it is more than the count reference that is repeatedly transmitted by the broadcast information. The count reference can be notified to the wireless terminal device 202 efficiently.
  • setting unit 11 is self-related to the execution determination of the movement operation of own wireless terminal device 202 based on the movement state estimated by movement state estimation unit 12.
  • the wireless terminal device 202 is set.
  • the notification unit 17 notifies the radio base station apparatus 101 of the movement state estimated by the movement state estimation unit 12.
  • the wireless base station apparatus 101 performs the handover operation of the wireless terminal apparatus 202 at an appropriate timing by using the movement state notified by the wireless terminal apparatus 202.
  • the occurrence of an inappropriate handover operation in 202 can be suppressed.
  • the setting unit 11 relates to the operation of the wireless terminal device 202 related to the determination of the handover operation of the wireless terminal device 202 based on the movement state. Set up.
  • the count unit 13 determines whether or not the predetermined condition is satisfied based on the information acquired from the wireless base station device 101.
  • wireless terminal apparatus 202 can reflect the said movement operation
  • the base station type determination unit 15 is based on the transmission power of the radio signal transmitted from the source or destination radio base station apparatus 101 in the movement operation.
  • the type of the wireless base station apparatus 101 that is the movement source or the movement destination in the movement operation is determined.
  • the count unit 13 determines whether or not the moving operation is to be counted.
  • the type of the radio base station apparatus 101 is appropriately determined, and an appropriate moving operation is selected as the target of the count. Can do.
  • the counting unit 13 moves to the wireless base station device 101 after the wireless terminal device 202 moves to the wireless base station device 101.
  • the moving operation is excluded from the count target.
  • the counting unit 13 performs the above operation when a movement operation from the other wireless base station device 101 to the small base station is performed. Exclude moving movements from counting.
  • the counting unit 13 performs the above operation when the mobile terminal device 202 moves from the small base station to another wireless base station device 101. Exclude moving movements from counting.
  • the counting unit 13 moves the own wireless terminal device 202 from the macro base station to another wireless base station device 101 or another wireless base station device 101.
  • the moving operation from the base station to the macro base station is performed, the moving operation is counted.
  • the counting unit 13 counts the number of times that the wireless terminal device 202 executes the handover operation.
  • the movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13.
  • the setting unit 11 sets the TTT value based on the movement state estimated by the movement state estimation unit 12.
  • the reception power measurement unit 16 measures the reception power of the radio signal transmitted from the radio base station apparatus 101. When the measurement result continuously satisfies a predetermined condition indicated by TTT, a measurement report indicating the measurement result is displayed. The data is transmitted to the communication base station 101 via the notification unit 17. Then, the count unit 13 performs counting according to the count standard acquired from the radio base station apparatus 101.
  • the wireless terminal device 202 can perform counting according to the count reference acquired from the wireless base station device 101 that grasps a wide communication environment compared to the wireless terminal device 202. Can be estimated appropriately.
  • the wireless terminal device 202 can appropriately estimate its own moving state.
  • the wireless terminal device 202 appropriately adjusts the TTT based on the appropriately estimated own movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal device 202 defined by 3GPP. As a result, the timing of the handover operation can be adjusted appropriately.
  • the counting unit 13 counts the number of times that the wireless terminal device 202 executes the handover operation.
  • the movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13.
  • the setting unit 11 sets the TTT value based on the movement state estimated by the movement state estimation unit 12.
  • the reception power measurement unit 16 measures the reception power of the radio signal transmitted from the radio base station apparatus 101. When the measurement result continuously satisfies a predetermined condition indicated by TTT, a measurement report indicating the measurement result is displayed. The data is transmitted to the communication base station 101 via the notification unit 17. Then, the count unit 13 weights the executed handover operation of the wireless terminal device 202 according to a predetermined count standard, and counts using the weighted value.
  • the wireless terminal device 202 can appropriately estimate its own moving state.
  • the wireless terminal device 202 appropriately adjusts the TTT based on the appropriately estimated own movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal device 202 defined by 3GPP. As a result, the timing of the handover operation can be adjusted appropriately.
  • count method list creation unit 22 can communicate with a plurality of radio base station apparatuses 101 by performing a move operation, and perform the move operation according to the count criterion.
  • a count reference is created for the wireless terminal device 202 that counts the number of executions. Then, the count method list notifying unit 23 notifies the other radio base station device 101 or the radio terminal device 202 of the count reference created by the count method list creating unit 22.
  • the movement state of the wireless terminal device 202 in the communication system is changed based on the count reference. Can be estimated appropriately.
  • the wireless terminal device 202 can appropriately adjust the timing of the movement operation, for example, based on its own movement state, so that the occurrence of an inappropriate movement operation is suppressed and the communication in the communication system is stabilized. Can be achieved.
  • an appropriate count reference should be created in consideration of the occurrence of the inappropriate movement operation. Can do.
  • the counting method list creation unit 22 weights each radio base station apparatus 101. Then, the counting method list notifying unit 23 notifies the weighting result by the counting method list creating unit 22 as a count reference.
  • count method list notifying section 23 notifies each radio base station apparatus 101 of the weighting result by count method list creating section 22.
  • the radio base station apparatus 101 A weighting result according to the density of the number of installed station apparatuses 101 can be transmitted to the other radio base station apparatus 101.
  • the radio base station apparatus 101 can appropriately cause the radio terminal apparatus 202 to estimate the movement state based on the weighting result, so that the movement operation of the radio terminal apparatus 202 is optimized over a wide area.
  • radio base station apparatus 101 operates as a communication control apparatus. That is, the radio base station apparatus 101 creates count method lists 41, 42, 43, and 44 including a count reference, and the created count method lists 41, 42, 43, and 44 are used as another radio base station apparatus 101 or a radio terminal.
  • the communication control apparatus may be a management apparatus for managing one or a plurality of radio base station apparatuses 101.
  • a management apparatus for managing the radio base station apparatus 101 such as an OAM (Operation, Administration, Administration and Maintenance) server that is communicatively connected to the MME 162 or the core network 301, count method lists 41 and 42 including a count reference. , 43, 44 may be created, and the created count method list 41, 42, 43, 44 may be transmitted to another radio base station apparatus 101.
  • OAM Operaation, Administration, Administration and Maintenance
  • the base station detection unit detects the establishment of the communication connection with the peripheral base station via the X2 interface, for example, when the peripheral base station in a dormant state is started. Are output to the counting method list creation unit.
  • the count method list creating unit When the count method list creating unit receives the detected ID of the radio base station apparatus 101 from the base station detecting unit, the count method list creating unit updates the count method list 41 or 42 indicating the count reference, for example, based on the received ID. Then, the count method list creation unit outputs, for example, the updated count method list 41 or 42 to the count method list notifying unit.
  • the count method list notifying unit When the count method list notifying unit receives, for example, the count method list 41 or 42 from the count method list creating unit, the count method list notifying unit transmits a part or all of the received count method list 41 or 42 to another radio base station apparatus 101.
  • each radio base station is changed by changing the transmission power of the radio signal transmitted by each radio base station apparatus 101.
  • the size of the cell formed by the station apparatus 101 is changed, or when a building is newly constructed in the cell, the area covered by each radio base station apparatus 101 changes.
  • the radio base station apparatus 101 may change.
  • the managed base station managed by a certain management base station may be managed by another management base station, so the management base station may not be able to create an appropriate count method list. The problem of end up occurs.
  • the management apparatus manages the wide-area radio base station apparatus 101 including a plurality of macro base stations, it can flexibly cope with a change in the cover area of each radio base station apparatus 101.
  • the counting method list can be appropriately created.
  • the wireless terminal device 202 which concerns on embodiment of this invention performed the update process of the movement state after completion of movement operation
  • the radio terminal apparatus 202 saves the broadcast information of each radio base station apparatus 101, and saves whether or not the moving operation is to be counted for the number of executions of the moving operation after the moving operation is completed a predetermined number of times. After the determination is made based on each notification information, the movement state update process may be performed.
  • wireless terminal apparatus 202 which concerns on embodiment of this invention measured the staying time in the cell which is located in the said radio
  • the radio base station apparatus 101 may measure the staying time of the radio terminal apparatus 202 residing in a cell formed by itself.
  • the wireless terminal device 202 does not need to count the number of handovers in a connection establishment state and the number of cell reselections in an idle state independently when performing a moving operation. For example, when performing a moving operation while alternately repeating a connection establishment state and an idle state, the wireless terminal device 202 estimates its own movement state based on a value obtained by combining the number of handovers and the number of cell reselections. Good.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Provided are a wireless terminal device, a wireless base station device, a communication control device, a management device, a communication control method and a communication control program which are capable of improving communication stability by appropriately controlling a movement operation of the wireless terminal device. The wireless terminal device (202) communicates with a plurality of wireless base station devices (101) by performing a movement operation, and is provided with: a counting unit (13) for counting the number of times that the wireless terminal device (202) executes the movement operation; and a movement-state estimation unit (12) for estimating the state of movement of the wireless terminal device (202) on the basis of said number of executions. Furthermore, the counting unit (13) counts according to a counting standard obtained from a wireless base station device (101).

Description

無線端末装置、無線基地局装置、通信制御装置、管理装置、通信制御方法および通信制御プログラムWireless terminal device, wireless base station device, communication control device, management device, communication control method, and communication control program
 本発明は、無線端末装置、無線基地局装置、通信制御装置、管理装置、通信制御方法および通信制御プログラムに関し、特に、無線端末装置が移動動作を行なうことにより複数の無線基地局装置と通信可能な通信システムにおける無線端末装置、無線基地局装置、通信制御装置、管理装置、通信制御方法および通信制御プログラムに関する。 The present invention relates to a radio terminal apparatus, a radio base station apparatus, a communication control apparatus, a management apparatus, a communication control method, and a communication control program, and in particular, can communicate with a plurality of radio base station apparatuses when the radio terminal apparatus performs a moving operation. The present invention relates to a wireless terminal device, a wireless base station device, a communication control device, a management device, a communication control method, and a communication control program in a simple communication system.
 従来、移動通信システムでは、半径数百メートルから数十キロメートルのセルすなわち無線端末装置が通信可能なエリアを形成する無線基地局装置(以下、マクロ基地局とも称する。)による通信サービスが提供されてきた。 Conventionally, in a mobile communication system, a communication service is provided by a radio base station apparatus (hereinafter also referred to as a macro base station) that forms an area in which a cell having a radius of several hundred meters to several tens of kilometers, that is, a radio terminal apparatus can communicate. It was.
 近年、移動通信サービスの加入者数の劇的な増加およびデータ通信による通信トラヒック量の増大から、より半径の小さいセルを形成することによって加入者および通信トラヒックを分散し、また、一定レベルの通信速度をユーザへ安定して提供することが望まれている。また、ビルの超高層化に伴う不感地対策のため、企業フロア内および一般家庭内への無線基地局装置の設置も望まれている。 In recent years, due to a dramatic increase in the number of subscribers of mobile communication services and an increase in the amount of communication traffic due to data communication, subscribers and communication traffic are distributed by forming smaller radius cells, and a certain level of communication It is desirable to provide speed to users in a stable manner. In addition, in order to deal with dead zones associated with the increase in the number of buildings, it is desired to install radio base station devices on the corporate floor and in ordinary households.
 これらの要望と併せて、無線基地局装置で使用される種々のデバイスの処理能力が飛躍的に向上したことによって無線基地局装置の小型化が進み、このような小型化された小型基地局が注目を集めている。 Together with these demands, the processing capability of various devices used in the radio base station apparatus has been dramatically improved, and the miniaturization of the radio base station apparatus has progressed. It attracts attention.
 この小型基地局の一種としてフェムト基地局およびピコ基地局が開発されている。フェムト基地局が形成するフェムトセル(Femto Cell)の半径は10メートル前後と小さいため、フェムト基地局は、マクロ基地局が形成するマクロセル(Macro Cell)の圏外となりマクロ基地局の設置が困難な屋内および地下街等の場所で使用されることが考えられる。 Femto base stations and pico base stations have been developed as a kind of small base stations. Since the femto cell formed by the femto base station has a small radius of around 10 meters, the femto base station is outside the range of the macro cell formed by the macro base station and it is difficult to install the macro base station. It can also be used in places such as underground malls.
 また、フェムト基地局は特定のエリアに多数設置されることから、フェムト基地局を直接コアネットワークに接続することは難しい。このため、特定のエリアに設置された多数のフェムト基地局を一旦、HeNB-GW等のゲートウェイ装置に接続し、フェムト基地局とコアネットワークとをHeNB-GW経由で接続することが考えられる。 Also, since many femto base stations are installed in a specific area, it is difficult to connect the femto base stations directly to the core network. For this reason, it is conceivable that a large number of femto base stations installed in a specific area are once connected to a gateway device such as a HeNB-GW, and the femto base station and the core network are connected via the HeNB-GW.
 また、ピコ基地局は、マクロ基地局をベースに開発され、たとえば半径100メートルから200メートルのピコセル(Pico Cell)を形成する。 Also, the pico base station is developed based on a macro base station, and forms, for example, a pico cell having a radius of 100 to 200 meters.
 このようなフェムト基地局、ピコ基地局およびマクロ基地局が混在する通信システムであるヘテロジーニアスネットワーク(Heterogeneous Network)では、たとえばマクロセル内に複数のフェムトセルまたはピコセルが形成される。このため、無線端末装置のハンドオーバ動作が起こりやすくなり、また、ハンドオーバ動作を行なう状況も複雑になることから、ハンドオーバ動作のタイミングが早すぎたり、あるいは遅すぎたりするなど、不適切なハンドオーバ動作が行なわれる場合がある(たとえば、3GPP(Third Generation Partnership Project) TR 36.902 V9.3.1 2011.3(非特許文献1)参照)。 In such a heterogeneous network (Heterogeneous Network), which is a communication system in which femto base stations, pico base stations, and macro base stations are mixed, a plurality of femto cells or pico cells are formed in a macro cell, for example. For this reason, the handover operation of the wireless terminal device is likely to occur, and the situation of performing the handover operation is complicated, so that an inappropriate handover operation such as the timing of the handover operation being too early or too late may occur. (See, for example, 3GPP (Third Generation Partnership Project) TR 36.902 V 9.3.1 2011 (Non-patent Document 1)).
 非特許文献1に記載されるような不適切なハンドオーバ動作が行なわれると、通信システムにおいて、通信断および通信トラフィックの増大等、種々の問題が生じる。このような不適切なハンドオーバ動作を抑制し、良好な通信システムを構築する技術が望まれる。 When an inappropriate handover operation as described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system. A technique for suppressing such an inappropriate handover operation and constructing a good communication system is desired.
 この発明は、上述の課題を解決するためになされたもので、その目的は、無線端末装置の移動動作を適切に制御することにより、通信の安定化を図ることが可能な無線基地局装置、無線基地局装置、通信制御装置、管理装置、通信制御方法および通信制御プログラムを提供することである。 This invention was made in order to solve the above-mentioned subject, The objective is a radio base station apparatus which can aim at stabilization of communication by controlling the movement operation of a radio | wireless terminal apparatus appropriately, A wireless base station device, a communication control device, a management device, a communication control method, and a communication control program are provided.
 (1)上記課題を解決するために、この発明のある局面に係わる無線端末装置は、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、自己の無線端末装置の上記移動動作の実行回数をカウントするためのカウント部と、上記カウント部によってカウントされた上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部とを備え、上記カウント部は、上記無線基地局装置から取得したカウント基準に従って上記カウントを行う。 (1) In order to solve the above problems, a radio terminal apparatus according to an aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a mobile operation, A counting unit for counting the number of executions of the moving operation of the device, and a movement state estimating unit for estimating the moving state of the wireless terminal device based on the number of executions counted by the counting unit. And the counting unit performs the counting in accordance with a counting standard acquired from the radio base station apparatus.
 このような構成により、無線端末装置と比べて広範囲の通信環境を把握する無線基地局装置から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置は、自己の移動状態を適切に推定することができる。ここで、移動動作は、たとえばハンドオーバ動作またはセル再選択動作である。 With such a configuration, counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do. Here, the moving operation is, for example, a handover operation or a cell reselection operation.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (2)好ましくは、上記カウント部は、実行された自己の無線端末装置の上記移動動作を上記カウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (2) Preferably, the counting unit weights the performed movement operation of its own wireless terminal device according to the counting standard, and performs the counting using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いて、移動動作の実行回数を適切にカウントすることができる。 With such a configuration, it is possible to appropriately count the number of executions of the moving operation using a value weighted according to the type of the moving operation.
 (3)上記課題を解決するために、この発明のある局面に係わる無線端末装置は、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、自己の無線端末装置の上記移動動作の実行回数をカウントするためのカウント部と、上記カウント部によってカウントされた上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部とを備え、上記カウント部は、実行された自己の無線端末装置の上記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (3) In order to solve the above problem, a radio terminal apparatus according to an aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, A counting unit for counting the number of executions of the moving operation of the device, and a movement state estimating unit for estimating the moving state of the wireless terminal device based on the number of executions counted by the counting unit. The counting unit weights the performed movement operation of its own wireless terminal device according to a predetermined count standard, and performs the counting using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (4)好ましくは、上記カウント部は、実行された自己の無線端末装置の上記移動動作が、上記カウント基準に従う所定条件を満たす場合には、上記所定条件を満たす上記移動動作を上記カウントの対象から除外する。 (4) Preferably, when the moving operation of the wireless terminal device that has been executed satisfies a predetermined condition in accordance with the counting criterion, the counting unit performs the moving operation that satisfies the predetermined condition as a target of the counting. Exclude from
 このような構成により、カウント基準に従って上記カウントの対象として適切な移動動作を選択することができるので、移動動作の実行回数を適切にカウントすることができる。 With such a configuration, it is possible to select an appropriate moving operation as the target of counting according to the count standard, and therefore it is possible to appropriately count the number of executions of the moving operation.
 (5)好ましくは、上記カウント部は、自己の無線端末装置のハンドオーバ動作におけるハンドオーバ元の無線基地局装置から受信したハンドオーバコマンドに含まれるカウント基準を取得する。 (5) Preferably, the counting unit acquires a count reference included in a handover command received from a handover source radio base station apparatus in a handover operation of the own radio terminal apparatus.
 このような構成により、移動動作の実行回数をカウントするために必要な情報を、無線端末装置の移動動作を管理する無線基地局装置から取得することができる。 With such a configuration, it is possible to acquire information necessary for counting the number of executions of the movement operation from the radio base station apparatus that manages the movement operation of the radio terminal apparatus.
 また、ハンドオーバ元の無線基地局装置においては、当該無線基地局装置が形成するセルに在圏する無線端末装置の台数が特に少ない場合、報知情報によりカウント基準を繰り返して送信するよりも、無線端末装置に対してカウント基準を効率よく通知することができる。 Further, in the handover source radio base station apparatus, when the number of radio terminal apparatuses located in the cell formed by the radio base station apparatus is particularly small, the radio terminal is more likely to transmit than the count reference is repeatedly transmitted by broadcast information. The count reference can be notified to the apparatus efficiently.
 (6)好ましくは、上記無線端末装置は、さらに、上記移動状態推定部によって推定された上記移動状態に基づいて、自己の無線端末装置の上記移動動作の実行判断に関わる自己の無線端末装置の設定を行うための設定部を備える。 (6) Preferably, the wireless terminal device further includes the wireless terminal device involved in the determination of execution of the moving operation of the wireless terminal device based on the movement state estimated by the movement state estimation unit. A setting unit for performing setting is provided.
 このような構成により、自己の移動状態に基づいて、たとえば移動動作のタイミング等のパラメータの設定を適切に行うことができる。 With such a configuration, it is possible to appropriately set parameters such as the timing of the moving operation, for example, based on the own moving state.
 (7)好ましくは、上記無線端末装置は、さらに、上記移動状態推定部によって推定された上記移動状態を、上記無線基地局装置へ通知するための通知部を備える。 (7) Preferably, the wireless terminal device further includes a notification unit for notifying the wireless base station device of the movement state estimated by the movement state estimation unit.
 このような構成により、当該無線基地局装置において、無線端末装置により通知された移動状態を用いることにより、適切なタイミングで当該無線端末装置の移動動作が行われるので、当該無線端末装置における不適切な移動動作の発生を抑制することができる。 With such a configuration, in the radio base station apparatus, the movement operation of the radio terminal apparatus is performed at an appropriate timing by using the movement state notified by the radio terminal apparatus. Generation of a moving operation can be suppressed.
 (8)より好ましくは、上記設定部は、上記移動状態に基づいて、自己の無線端末装置のハンドオーバ動作の実行判断に関わる自己の無線端末装置の動作に関する設定を行う。 (8) More preferably, the setting unit performs setting related to the operation of the own wireless terminal device related to execution determination of the handover operation of the own wireless terminal device based on the movement state.
 このような構成により、ハンドオーバ動作の実行判断に関わる動作を行うタイミング等を調整することができる。無線端末装置の移動状態に基づいて上記タイミングの調整を適切に行うことにより、ハンドオーバ動作のタイミングが適正化され、不適切なハンドオーバ動作の発生を抑制することができる。 With such a configuration, it is possible to adjust the timing for performing an operation related to the execution determination of the handover operation. By appropriately adjusting the timing based on the movement state of the wireless terminal device, the timing of the handover operation can be optimized and the occurrence of an inappropriate handover operation can be suppressed.
 (9)より好ましくは、上記カウント部は、上記無線基地局装置から取得した情報に基づいて、上記所定条件を満たすか否かを判断する。 (9) More preferably, the counting unit determines whether or not the predetermined condition is satisfied based on information acquired from the radio base station apparatus.
 このような構成により、たとえば無線基地局装置における無線信号の送信電力の設定変更により通信システムの構成が変更される場合においても、当該変更を無線端末装置において速やかに反映させることができるので、通信システムの変更に対する柔軟性を高めることができる。 With such a configuration, for example, even when the configuration of the communication system is changed by changing the setting of the transmission power of the radio signal in the radio base station device, the change can be quickly reflected in the radio terminal device. Flexibility for system changes can be increased.
 また、周辺の無線基地局装置の情報を予め取得することにより、移動動作の開始に先立って当該移動動作をカウントの対象とするか否かを判断することができる。これにより、無線端末装置は、当該移動動作を自己の移動状態の推定に速やかに反映させることができる。 In addition, by acquiring information of surrounding radio base station devices in advance, it is possible to determine whether or not the moving operation is to be counted prior to the start of the moving operation. Thereby, the radio | wireless terminal apparatus can reflect the said movement operation | movement rapidly in estimation of an own movement state.
 (10)好ましくは、上記無線端末装置は、さらに、移動動作における移動元または移動先の無線基地局装置から送信される無線信号の送信電力に基づいて、上記移動動作における移動元または移動先の無線基地局装置の種別を判定するための基地局種別判定部を備え、上記カウント部は、上記基地局種別判定部の判定結果に基づいて、上記移動動作を上記カウントの対象とするか否かを判断する。 (10) Preferably, the wireless terminal device further moves the source or destination of the moving operation based on transmission power of a radio signal transmitted from the source or destination wireless base station device in the moving operation. A base station type determining unit for determining a type of the radio base station apparatus, wherein the counting unit determines whether the moving operation is to be counted based on a determination result of the base station type determining unit; Judging.
 このような構成により、無線基地局装置が送信する無線信号の送信電力に基づいて、当該無線基地局装置の種別を適切に判別し、上記カウントの対象として適切な移動動作を選択することができる。 With such a configuration, it is possible to appropriately determine the type of the radio base station apparatus based on the transmission power of the radio signal transmitted by the radio base station apparatus, and to select an appropriate moving operation as the target of the counting. .
 (11)好ましくは、上記カウント部は、自己の無線端末装置の無線基地局装置への移動動作が行われてから他の無線基地局装置への移動動作が行われるまでの滞在時間が所定のしきい値未満の場合に、上記移動動作を上記カウントの対象から除外する。 (11) Preferably, the counting unit has a predetermined residence time from the time when the wireless terminal device moves to the wireless base station device to the time when the moving operation to another wireless base station device is performed. If it is less than the threshold value, the moving operation is excluded from the count target.
 このように、移動動作の完了後に在圏するセルにおける滞在時間を選択基準にする構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 As described above, with the configuration in which the stay time in the cell that is in the area after completion of the moving operation is used as a selection criterion, it is possible to select an appropriate moving operation as a target of the counting and appropriately estimate its own moving state.
 (12)好ましくは、上記カウント部は、自己の無線端末装置の他の無線基地局装置から小型基地局への移動動作が行われた場合に、上記移動動作を上記カウントの対象から除外する。 (12) Preferably, the counting unit excludes the moving operation from the object of counting when a moving operation from another wireless base station device to the small base station is performed.
 このように、他の無線基地局装置から小型基地局への移動動作をカウントの対象から除外する構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 As described above, by selecting a movement operation from another radio base station device to a small base station from the count target, an appropriate movement operation is selected as the count target, and its own movement state is appropriately estimated. be able to.
 (13)好ましくは、上記カウント部は、自己の無線端末装置の小型基地局から他の無線基地局装置への移動動作が行われた場合に、上記移動動作を上記カウントの対象から除外する。 (13) Preferably, the counting unit excludes the moving operation from the object of counting when the moving operation of the own wireless terminal device from the small base station to another wireless base station device is performed.
 このように、小型基地局から他の無線基地局装置への移動動作をカウントの対象から除外する構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 As described above, by selecting the movement operation from the small base station to another radio base station apparatus from the count target, the appropriate movement operation is selected as the count target, and the own movement state is appropriately estimated. be able to.
 (14)好ましくは、上記カウント部は、自己の無線端末装置のマクロ基地局から他の無線基地局装置への移動動作または他の無線基地局装置からマクロ基地局への移動動作が行われた場合に、上記移動動作を上記カウントの対象とする。 (14) Preferably, the counting unit performs a movement operation from the macro base station of the own radio terminal device to another radio base station device or a movement operation from another radio base station device to the macro base station. In this case, the moving operation is the target of the counting.
 このように、サイズが大きいマクロセルを移動元または移動先とする移動動作をカウント対象とする構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 In this way, with the configuration in which the movement operation with the macro cell having a large size as the movement source or the movement destination is counted, it is possible to select an appropriate movement operation as the target of the counting and appropriately estimate its own movement state. it can.
 (15)上記課題を解決するために、この発明のある局面に係わる無線端末装置は、ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、自己の無線端末装置の上記ハンドオーバ動作の実行回数をカウントするためのカウント部と、上記カウント部によってカウントされた上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部と、上記移動状態推定部によって推定された上記移動状態に基づいて、TTT(Time to Trigger)の値を設定するための設定部と、上記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が上記TTTで示される時間継続して所定条件を満たす場合に、上記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するための受信電力報告部とを備え、上記カウント部は、上記無線基地局装置から取得したカウント基準に従って上記カウントを行う。 (15) In order to solve the above problem, a radio terminal apparatus according to an aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, A counting unit for counting the number of executions of the handover operation of the device, a movement state estimation unit for estimating the movement state of its own wireless terminal device based on the number of executions counted by the counting unit, Based on the movement state estimated by the movement state estimation unit, a setting unit for setting a value of TTT (Time to Trigger), and a reception power of a radio signal transmitted from the radio base station device are measured. When the measurement result continues for the time indicated by the TTT and satisfies a predetermined condition, a measurement report indicating the measurement result is transmitted to the wireless communication destination. And a received power report unit for transmission to Chikyoku device, the counting unit performs the count according to the count criteria acquired from the radio base station apparatus.
 このような構成により、無線端末装置と比べて広範囲の通信環境を把握する無線基地局装置から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置は、自己の移動状態を適切に推定することができる。 With such a configuration, counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、3GPPで規定された無線端末装置によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 Then, the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 (16)上記課題を解決するために、この発明のある局面に係わる無線端末装置は、ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、自己の無線端末装置の上記ハンドオーバ動作の実行回数をカウントするためのカウント部と、上記カウント部によってカウントされた上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部と、上記移動状態推定部によって推定された上記移動状態に基づいて、TTTの値を設定するための設定部と、上記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が上記TTTで示される時間継続して所定条件を満たす場合に、上記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するための受信電力報告部とを備え、上記カウント部は、実行された自己の無線端末装置の上記ハンドオーバ動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (16) In order to solve the above problem, a radio terminal apparatus according to an aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, A counting unit for counting the number of executions of the handover operation of the device, a movement state estimation unit for estimating the movement state of its own wireless terminal device based on the number of executions counted by the counting unit, Based on the movement state estimated by the movement state estimation unit, a setting unit for setting a value of TTT and a reception power of a radio signal transmitted from the radio base station device are measured, and a measurement result is the above When a predetermined condition is continuously satisfied for the time indicated by TTT, a measurement report indicating the measurement result is transmitted to the radio base station apparatus of the communication connection destination And a order received power reporting section, the counting unit, the handover operation of the own wireless terminal device executes weighted according to a predetermined count basis, it performs the counting using a weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、3GPPで規定された無線端末装置によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 Then, the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 (17)上記課題を解決するために、この発明のある局面に係わる通信制御装置は、移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って上記移動動作の実行回数をカウントする無線端末装置について、上記カウント基準を作成するためのカウント基準作成部と、上記カウント基準作成部によって作成された上記カウント基準を他の装置に通知するためのカウント基準通知部とを備える。 (17) In order to solve the above-described problem, a communication control apparatus according to an aspect of the present invention is capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, and executing the moving operation according to a count criterion. For a wireless terminal device that counts the number of times, a count reference creation unit for creating the count reference, and a count reference notification unit for notifying other devices of the count reference created by the count reference creation unit Prepare.
 このように、たとえば無線端末装置または無線基地局装置へ当該カウント基準を通知することにより、当該カウント基準に基づいて、通信システムにおける無線端末装置の移動状態を、無線端末装置において適切に推定することができる。 As described above, for example, by notifying the wireless terminal device or the wireless base station device of the count reference, the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
 これにより、無線端末装置は、自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができるので、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 As a result, the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. Can be planned.
 また、たとえば、通信制御装置が、不適切な移動動作を含む複数の移動動作を管理する場合、不適切な移動動作の発生状況を考慮した上で、適切なカウント基準を作成することができる。 Also, for example, when the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
 (18)好ましくは、上記カウント基準作成部は、各上記無線基地局装置を重み付けし、上記カウント基準通知部は、上記カウント基準作成部による重み付け結果を上記カウント基準として通知する。 (18) Preferably, the count reference creation unit weights each of the radio base station devices, and the count reference notification unit notifies the weighting result of the count reference creation unit as the count reference.
 このような構成により、無線基地局装置毎に、移動動作のカウント基準を細かく重み付けすることができるので、通信システムにおける無線端末装置の移動状態を、当該カウント基準に基づいて適切に推定することができる。 With such a configuration, it is possible to finely weight the movement operation count reference for each radio base station apparatus, so that it is possible to appropriately estimate the movement state of the radio terminal apparatus in the communication system based on the count reference. it can.
 (19)より好ましくは、上記カウント基準通知部は、上記カウント基準作成部による重み付け結果を上記各無線基地局装置に通知する。 (19) More preferably, the count reference notification unit notifies the radio base station apparatus of the weighting result by the count reference creation unit.
 このような構成により、たとえば通信制御装置により管理される無線基地局装置が、自己により形成されるセル内に位置する他の無線基地局装置を管理する場合、通信制御装置は、当該他の無線基地局装置の設置数の密度に応じた重み付け結果を、当該無線基地局装置および当該他の無線基地局装置へ送信することができる。 With such a configuration, for example, when a radio base station device managed by a communication control device manages another radio base station device located in a cell formed by itself, the communication control device A weighting result according to the density of the number of installed base station apparatuses can be transmitted to the radio base station apparatus and the other radio base station apparatuses.
 これにより、当該無線基地局装置は、当該重み付け結果に基づいて、無線端末装置に対して移動状態を適切に推定させることができるので、広範なエリアにわたって無線端末装置の移動動作を最適化することができる。 As a result, the radio base station apparatus can cause the radio terminal apparatus to appropriately estimate the movement state based on the weighting result, so that the movement operation of the radio terminal apparatus can be optimized over a wide area. Can do.
 (20)上記課題を解決するために、この発明のある局面に係わる無線基地局装置は、上記(17)の通信制御装置を備える。 (20) In order to solve the above-described problem, a radio base station apparatus according to an aspect of the present invention includes the communication control apparatus according to (17).
 このような構成により、無線通信システムにおけるカウント基準の作成および当該カウント基準の通知を各無線基地局装置で行なうことができるため、当該カウント基準の作成処理および当該カウント基準の通知の処理負荷を分散させることができる。 With such a configuration, each radio base station apparatus can create a count reference and notify the count reference in the wireless communication system, so the processing load of the count reference creating process and the count reference notification is distributed. Can be made.
 (21)上記課題を解決するために、この発明のある局面に係わる管理装置は、上記無線基地局装置を管理し、上記(17)の通信制御装置を備える。 (21) In order to solve the above-described problem, a management apparatus according to an aspect of the present invention manages the radio base station apparatus and includes the communication control apparatus according to (17).
 このような構成により、無線通信システムにおけるカウント基準の作成および当該カウント基準の通知を管理装置において一括して行なうことができるため、当該カウント基準の作成処理および当該カウント基準の通知を、より効率的に行なうことができる。 With such a configuration, the creation of the count reference and the notification of the count reference in the wireless communication system can be performed collectively in the management apparatus, so that the creation process of the count reference and the notification of the count reference can be performed more efficiently. Can be done.
 (22)また、この発明のある局面に係わる通信制御方法は、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、自己の無線端末装置の上記移動動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを含み、上記カウントするステップにおいては、上記無線基地局装置から取得したカウント基準に従って上記カウントを行う。 (22) A communication control method according to an aspect of the present invention is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a mobile operation, Including the step of counting the number of executions of the moving operation and the step of estimating the movement state of the own wireless terminal device based on the counted number of executions, and in the step of counting, from the radio base station device The count is performed in accordance with the acquired count standard.
 このような構成により、無線端末装置と比べて広範囲の通信環境を把握する無線基地局装置から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置は、自己の移動状態を適切に推定することができる。 With such a configuration, counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (23)また、この発明のある局面に係わる通信制御方法は、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、自己の無線端末装置の上記移動動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを含み、上記カウントするステップにおいては、実行された自己の無線端末装置の上記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (23) Further, a communication control method according to an aspect of the present invention is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a moving operation. A step of counting the number of executions of the moving operation, and a step of estimating a movement state of the own wireless terminal device based on the counted number of executions. In the step of counting, The moving operation of the terminal device is weighted according to a predetermined count standard, and the count is performed using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (24)また、この発明の別の局面に係わる通信制御方法は、ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、自己の無線端末装置の上記ハンドオーバ動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップと、推定した上記移動状態に基づいて、TTTの値を設定するステップと、上記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が上記TTTで示される時間継続して所定条件を満たす場合に、上記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するステップとを含み、上記カウントするステップにおいては、上記無線基地局装置から取得したカウント基準に従って上記カウントを行う。 (24) A communication control method according to another aspect of the present invention is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, and the radio control apparatus of the present invention A step of counting the number of executions of the handover operation, a step of estimating a movement state of the wireless terminal device based on the counted number of executions, and setting a TTT value based on the estimated movement state Measuring a reception power of a radio signal transmitted from the radio base station apparatus, and communicating a measurement report indicating the measurement result when the measurement result satisfies a predetermined condition continuously for a time indicated by the TTT. And transmitting to the connection-destination radio base station apparatus, and in the counting step, the radio base station apparatus It performs the count according al acquired count criteria.
 このような構成により、無線端末装置と比べて広範囲の通信環境を把握する無線基地局装置から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置は、自己の移動状態を適切に推定することができる。 With such a configuration, counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、3GPPで規定された無線端末装置によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 Then, the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 (25)また、この発明の別の局面に係わる通信制御方法は、ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、自己の無線端末装置の上記ハンドオーバ動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップと、推定した上記移動状態に基づいて、TTTの値を設定するステップと、上記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が上記TTTで示される時間継続して所定条件を満たす場合に、上記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するステップとを含み、上記カウントするステップにおいては、実行された自己の無線端末装置の上記ハンドオーバ動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (25) A communication control method according to another aspect of the present invention is a communication control method in a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation. A step of counting the number of executions of the handover operation, a step of estimating a movement state of the wireless terminal device based on the counted number of executions, and setting a TTT value based on the estimated movement state Measuring a reception power of a radio signal transmitted from the radio base station apparatus, and communicating a measurement report indicating the measurement result when the measurement result satisfies a predetermined condition continuously for a time indicated by the TTT. Transmitting to the radio base station apparatus of the connection destination, and in the counting step, The handover operation of a terminal apparatus is weighted according to a predetermined count basis, performs the counting using a weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、3GPPで規定された無線端末装置によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 Then, the wireless terminal apparatus appropriately adjusts the TTT based on its own estimated movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal apparatus defined by 3GPP. Thus, it is possible to appropriately adjust the timing of the handover operation.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 (26)また、この発明の別の局面に係わる通信制御方法は、通信制御装置における通信制御方法であって、移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って上記移動動作の実行回数をカウントする無線端末装置について、上記カウント基準を作成するステップと、作成した上記カウント基準を他の装置に通知するステップとを含む。 (26) Further, a communication control method according to another aspect of the present invention is a communication control method in a communication control apparatus, which is capable of communicating with a plurality of radio base station apparatuses by performing a moving operation, and is a counting reference. For the wireless terminal device that counts the number of executions of the moving operation according to the steps, the step of creating the count reference and the step of notifying the other device of the created count reference are included.
 このように、たとえば無線端末装置または無線基地局装置へ当該カウント基準を通知することにより、当該カウント基準に基づいて、通信システムにおける無線端末装置の移動状態を、無線端末装置において適切に推定することができる。 As described above, for example, by notifying the wireless terminal device or the wireless base station device of the count reference, the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
 これにより、無線端末装置は、自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができるので、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 As a result, the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. You can plan.
 また、たとえば、通信制御装置が、不適切な移動動作を含む複数の移動動作を管理する場合、不適切な移動動作の発生状況を考慮した上で、適切なカウント基準を作成することができる。 Also, for example, when the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
 (27)また、この発明のある局面に係わる通信制御プログラムは、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置において用いられる通信制御プログラムであって、コンピュータに、自己の無線端末装置の上記移動動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを実行させるためのプログラムであり、上記カウントするステップにおいては、上記無線基地局装置から取得したカウント基準に従って上記カウントを行う。 (27) A communication control program according to an aspect of the present invention is a communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation. A program for executing the step of counting the number of executions of the moving operation of the wireless terminal device and the step of estimating the movement state of the wireless terminal device based on the counted number of executions. In the step of performing, the counting is performed according to the counting standard acquired from the radio base station apparatus.
 このような構成により、無線端末装置と比べて広範囲の通信環境を把握する無線基地局装置から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置は、自己の移動状態を適切に推定することができる。 With such a configuration, counting can be performed according to the count standard acquired from the radio base station apparatus that grasps a wide range of communication environment compared to the radio terminal apparatus, and thus the radio terminal apparatus appropriately estimates its movement state. can do.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (28)また、この発明のある局面に係わる通信制御プログラムは、移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置において用いられる通信制御プログラムであって、コンピュータに、自己の無線端末装置の上記移動動作の実行回数をカウントするステップと、カウントした上記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを実行させるためのプログラムであり、上記カウントするステップにおいては、実行された自己の無線端末装置の上記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて上記カウントを行う。 (28) A communication control program according to an aspect of the present invention is a communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation. A program for executing the step of counting the number of executions of the moving operation of the wireless terminal device and the step of estimating the movement state of the wireless terminal device based on the counted number of executions. In the step of performing, the above-mentioned movement operation of the own wireless terminal device is weighted according to a predetermined count standard, and the above-mentioned counting is performed using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device moves in the heterogeneous network, the wireless terminal device can appropriately estimate its own movement state.
 そして、無線端末装置は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the wireless terminal device can appropriately adjust the timing of the movement operation, for example, based on the appropriately estimated own movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 (29)また、この発明の別の局面に係わる通信制御プログラムは、通信制御装置において用いられる通信制御プログラムであって、コンピュータに、移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って上記移動動作の実行回数をカウントする無線端末装置について、上記カウント基準を作成するステップと、作成した上記カウント基準を他の装置に通知するステップとを実行させるためのプログラムである。 (29) A communication control program according to another aspect of the present invention is a communication control program used in the communication control apparatus, and can communicate with a plurality of radio base station apparatuses by performing a moving operation on the computer. A program for executing a step of creating the count reference and a step of notifying another device of the created count reference for a wireless terminal device that counts the number of executions of the moving operation according to the count reference is there.
 このように、たとえば無線端末装置または無線基地局装置へ当該カウント基準を通知することにより、当該カウント基準に基づいて、通信システムにおける無線端末装置の移動状態を、無線端末装置において適切に推定することができる。 As described above, for example, by notifying the wireless terminal device or the wireless base station device of the count reference, the wireless terminal device appropriately estimates the movement state of the wireless terminal device in the communication system based on the count reference. Can do.
 これにより、無線端末装置は、自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができるので、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 As a result, the wireless terminal device can appropriately adjust the timing of the moving operation, for example, based on its own moving state, so that the occurrence of an inappropriate moving operation is suppressed and the communication in the communication system is stabilized. You can plan.
 また、たとえば、通信制御装置が、不適切な移動動作を含む複数の移動動作を管理する場合、不適切な移動動作の発生状況を考慮した上で、適切なカウント基準を作成することができる。 Also, for example, when the communication control apparatus manages a plurality of movement operations including an inappropriate movement operation, it is possible to create an appropriate count reference in consideration of the occurrence state of the inappropriate movement operation.
 本発明によれば、無線端末装置の移動動作を適切に制御することにより、通信の安定化を図ることができる。 According to the present invention, communication can be stabilized by appropriately controlling the movement operation of the wireless terminal device.
本発明の実施の形態に係る無線通信システムの構成を示す図である。It is a figure which shows the structure of the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて移動動作が行われる状況の一例を示す図である。It is a figure which shows an example of the condition where movement operation | movement is performed in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおけるセル再選択動作のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of the cell reselection operation | movement in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおけるハンドオーバ動作のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of the hand-over operation | movement in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(Too Late HO)が生じた状況の一例を示す図である。It is a figure which shows an example of the condition where improper hand-over operation (Too Late HO) occurred in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(Too Late HO)およびその検出処理のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of an improper handover operation (Too Late HO) and its detection process in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(Too Early HO)が生じた状況の一例を示す図である。It is a figure which shows an example of the condition where the inappropriate hand-over operation (Too Early HO) occurred in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(Too Early HO)が生じた状況の一例を示す図である。It is a figure which shows an example of the condition where the inappropriate hand-over operation (Too Early HO) occurred in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(Too Early HO)およびその検出処理のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of the improper handover operation (Too Early HO) and its detection process in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(HO to Wrong Cell)が生じた状況の一例を示す図である。It is a figure which shows an example of the condition where improper handover operation (HO to Wong Cell) occurred in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(HO to Wrong Cell)およびその検出処理のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of the improper handover operation (HO to Wong Cell) and its detection process in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、無線端末装置の受信品質のシミュレーション結果を示す図である。It is a figure which shows the simulation result of the reception quality of the radio | wireless terminal apparatus in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA1を示す図である。In the radio | wireless communications system which concerns on embodiment of this invention, it is a figure which shows event A1 in which a radio | wireless terminal apparatus transmits a notification of a measurement result. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA2を示す図である。In the radio | wireless communications system which concerns on embodiment of this invention, it is a figure which shows event A2 in which a radio | wireless terminal apparatus transmits a notification of a measurement result. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA3を示す図である。FIG. 10 is a diagram illustrating an event A3 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA4を示す図である。In the radio | wireless communications system which concerns on embodiment of this invention, it is a figure which shows event A4 in which a radio | wireless terminal apparatus transmits a notification of a measurement result. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA5を示す図である。FIG. 10 is a diagram illustrating an event A5 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、ヒステリシスHSの調整によるハンドオーバ動作のタイミング制御を示す図である。It is a figure which shows the timing control of the hand-over operation by adjustment of hysteresis HS in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、TTTの調整によるハンドオーバ動作のタイミング制御を示す図である。It is a figure which shows the timing control of the hand-over operation by adjustment of TTT in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、オフセットOSTの調整によるハンドオーバ動作のタイミング制御を示す図である。It is a figure which shows the timing control of the hand-over operation by adjustment of offset OST in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、各位置の無線信号の受信電力の一例を示す図である。It is a figure which shows an example of the reception power of the radio signal of each position in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、ハンドオーバ動作のタイミングを制御するためのパラメータの他の例を説明するための図である。FIG. 10 is a diagram for explaining another example of parameters for controlling the timing of the handover operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、接続確立状態の無線端末装置が移動状態の検出処理を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、アイドル状態の無線端末装置が移動状態の検出処理を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when a wireless terminal device in an idle state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、接続確立状態の無線端末装置がハンドオーバ動作のタイミング調整を行う際の動作手順を定めたフローチャートである。6 is a flowchart defining an operation procedure when a wireless terminal apparatus in a connection established state performs timing adjustment of a handover operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、アイドル状態の無線端末装置がセル再選択動作のタイミング調整を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when an idle wireless terminal apparatus performs timing adjustment of a cell reselection operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおける、無線端末装置の移動経路に基づく移動動作の実行回数の比較を示す図である。It is a figure which shows the comparison of the execution frequency of the movement operation | movement based on the movement path | route of a radio | wireless terminal apparatus in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線端末装置の構成を示す図である。It is a figure which shows the structure of the radio | wireless terminal apparatus which concerns on embodiment of this invention. 本発明の実施の形態に係る無線端末装置における制御部の構成を示す図である。It is a figure which shows the structure of the control part in the radio | wireless terminal apparatus which concerns on embodiment of this invention. 本発明の実施の形態に係る無線基地局装置の構成を示す図である。It is a figure which shows the structure of the radio base station apparatus which concerns on embodiment of this invention. 本発明の実施の形態に係る無線基地局装置における制御部の構成を示す図である。It is a figure which shows the structure of the control part in the radio base station apparatus which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの一例を示す図である。It is a figure which shows an example of the count method list | wrist in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの他の一例を示す図である。It is a figure which shows another example of the count method list | wrist in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、無線端末装置の移動経路の一例を示す図である。It is a figure which shows an example of the movement path | route of a radio | wireless terminal apparatus in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの更新処理および無線端末装置へのカウント基準の通知処理のシーケンスの一例を示す図である。It is a figure which shows an example of the sequence of the update process of a count method list | wrist, and the notification process of the count reference | standard to a radio | wireless terminal apparatus in the radio | wireless communications system which concerns on embodiment of this invention. 本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置がカウント方法リストの更新処理を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置がカウント方法リストの更新処理を行う際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when a radio base station apparatus notifies a count reference to a radio terminal apparatus in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順の他の例を定めたフローチャートである。FIG. 11 is a flowchart defining another example of an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of a count reference in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順の他の例を定めたフローチャートである。FIG. 11 is a flowchart defining another example of an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of a count reference in the radio communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置がセル再選択動作の完了後に行う移動状態の更新動作の一例を示すシーケンス図である。FIG. 10 is a sequence diagram illustrating an example of a movement state update operation performed by the wireless terminal device after completion of the cell reselection operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置がハンドオーバ動作の完了後に行う移動状態の更新動作の一例を示すシーケンス図である。FIG. 10 is a sequence diagram showing an example of a movement state update operation performed by the wireless terminal device after completion of the handover operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動状態の検出処理および当該移動状態に応じた設定処理を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when a wireless terminal device performs a movement state detection process and a setting process according to the movement state in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動状態の検出処理および当該移動状態の無線基地局装置への通知処理を行う際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when a wireless terminal device performs a movement state detection process and a notification process to the wireless base station apparatus of the movement state in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順を定めたフローチャートである。5 is a flowchart defining an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention. 本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。FIG. 10 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
 以下、本発明の実施の形態について図面を用いて説明する。なお、図中同一または相当部分には同一符号を付してその説明は繰り返さない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
 無線基地局装置は、自らの形成するセルおよび周辺セルについての情報、すなわち無線信号の周波数および周辺セルのID(identification)等を無線端末装置に通知する。無線端末装置は、無線基地局装置から通知された情報に基づいて、周辺セルの検出および測定を行なう。無線端末装置は、この測定結果に基づいて、周辺セルへの移動を開始する。ここで、無線端末装置の「移動」とは、ハンドオーバを意味することに加えて、セル再選択(Cell Reselection)を意味する。 The radio base station apparatus notifies the radio terminal apparatus of information about the cell and the neighboring cell that it forms, that is, the frequency of the radio signal and the ID (identification) of the neighboring cell. The wireless terminal device detects and measures neighboring cells based on information notified from the wireless base station device. The wireless terminal device starts moving to the neighboring cell based on the measurement result. Here, “movement” of the wireless terminal device means cell reselection in addition to handover.
 ハンドオーバとは、ある無線基地局装置との通信接続が確立した状態(以下、接続確立状態と称する)にある無線端末装置の通信接続先が他の無線基地局装置へ切り替えられることを意味する。 Handover means that the communication connection destination of a wireless terminal device in a state where communication connection with a certain radio base station device is established (hereinafter referred to as connection establishment state) is switched to another radio base station device.
 セル再選択とは、アイドル状態の無線端末装置が今後通信を開始する、すなわち通話またはデータ通信を開始する際にどのセルを介して通信を行なうかを選択することを意味すし、たとえば3GPP TS 36.304に記載の内容が当てはまる。 The cell reselection means that the idle wireless terminal device starts communication in the future, that is, selects which cell is used for communication when starting a call or data communication. For example, 3GPP TS 36 .304 applies.
 ハンドオーバ動作は、無線端末装置の通信接続先の無線基地局装置主導で行なわれる。一方、セル再選択は、無線端末装置主導で行なわれ、通常、無線基地局装置が無線端末装置に対して特に指示を与えることなく実行される。 The handover operation is performed by the radio base station apparatus that is the communication connection destination of the radio terminal apparatus. On the other hand, cell reselection is performed under the initiative of the radio terminal device, and is usually executed without a specific instruction from the radio base station device to the radio terminal device.
 無線端末装置の「アイドル状態」とは、ある無線基地局装置を無線端末装置が通信相手として選択しており、かつ当該無線基地局装置と通信を行っていない状態である。また、「通信を行っていない状態」とは、当該無線基地局装置へ何らかの情報を送信する動作を行っていない状態である。 The “idle state” of a wireless terminal device is a state in which a certain wireless base station device has selected a wireless terminal device as a communication partner and is not communicating with the wireless base station device. In addition, the “state in which communication is not performed” is a state in which an operation for transmitting some information to the radio base station apparatus is not performed.
 たとえば、無線端末装置が無線基地局装置と通信しているときには、無線端末装置の移動先は無線基地局装置またはコアネットワークにおける上位装置が決定する。また、たとえば、無線端末装置が無線基地局装置と通信していないときには、無線端末装置の移動先は無線端末装置が決定する。 For example, when the wireless terminal device is communicating with the wireless base station device, the destination of the wireless terminal device is determined by the wireless base station device or the higher-level device in the core network. For example, when the wireless terminal device is not communicating with the wireless base station device, the wireless terminal device determines the destination of the wireless terminal device.
 また、無線端末装置がセルに在圏している、とは、無線端末装置が、当該セルを形成する無線基地局装置を通信先として選択し、かつ当該無線基地局装置と通信可能な状態または通信中である状態を意味する。 The wireless terminal device is located in a cell means that the wireless terminal device selects a wireless base station device forming the cell as a communication destination and can communicate with the wireless base station device. This means that communication is in progress.
 具体的には、たとえば、無線端末装置が新たなセルすなわち無線基地局装置へ移動したことを当該無線基地局装置の上位装置が登録した状態を意味する。 Specifically, for example, it means a state in which a higher-level device of the radio base station apparatus registers that the radio terminal apparatus has moved to a new cell, that is, the radio base station apparatus.
 また、「在圏」は、無線端末装置の属するトラッキングエリアの更新を上位装置が登録した状態を含むものとする。 In addition, “located” includes a state in which a higher-level device has registered the update of the tracking area to which the wireless terminal device belongs.
 すなわち、無線端末装置は、新たなセルへ移動した場合、この移動によって自己の存在するトラッキングエリアすなわちページング処理の対象エリアが変わった場合には、トラッキングエリア更新処理を実行する。 That is, when the wireless terminal device moves to a new cell, if the tracking area in which the wireless terminal device exists, that is, the paging process target area is changed, the wireless terminal device executes a tracking area update process.
 フェムトセルおよびアクセスモードは、3GPP SPEC TS22.220において以下のように説明されている。すなわち、フェムト基地局は、無線インタフェースを介して接続されている無線端末装置を、IPバックホール(backhaul)を用いて、移動通信事業者網に接続する顧客構内装置である。 The femtocell and access mode are described in 3GPP SPEC TS22.220 as follows. That is, a femto base station is a customer premises apparatus that connects a wireless terminal device connected via a wireless interface to a mobile communication carrier network using an IP backhaul.
 また、フェムトセルのアクセスモードにおいて、クローズドアクセスモードのフェムト基地局は、関連するCSG(Closed Subscriber Group)メンバーにのみサービスを提供する。また、ハイブリッドモードのフェムト基地局は、関連するCSGメンバーおよびCSGノンメンバーにサービスを提供する。また、オープンアクセスモードのフェムト基地局は、通常の基地局として動作する。 Also, in the access mode of the femtocell, the femto base station in the closed access mode provides a service only to the related CSG (Closed Subscriber Group) members. The hybrid mode femto base station also provides services to the associated CSG members and CSG non-members. The femto base station in the open access mode operates as a normal base station.
 本発明の実施の形態に係る無線通信システムにおいても、このような3GPPの定義を適用してもよい。 Such a 3GPP definition may also be applied to the wireless communication system according to the embodiment of the present invention.
 また、上記定義と合わせて、あるいは別個に、以下のような定義を適用することも可能である。 Also, the following definitions can be applied together with the above definitions or separately.
 マクロ基地局およびピコ基地局は、事業者の管理下にあり、事業者と契約している無線基地局装置が通信可能な無線基地局装置である。また、マクロ基地局およびピコ基地局は、基本的に電源がオフになることはないと考えられる。 The macro base station and the pico base station are radio base station devices that are under the control of the operator and that can communicate with the radio base station device that has contracted with the operator. Further, it is considered that the macro base station and the pico base station are basically not turned off.
 また、フェムト基地局は、主に個人または法人の建物内に設置され、ユーザの事情により移動するまたは電源がオフとなる可能性がある無線基地局装置である。 Also, the femto base station is a radio base station apparatus that is mainly installed in an individual or corporate building and may move or be turned off depending on user circumstances.
 また、フェムト基地局は、オープン/ハイブリッド/クローズドのいずれかのアクセスモードで動作する。フェムト基地局は、クローズドアクセスモードで動作する場合には、登録済みのメンバー(端末)のみ接続可能となる。また、クローズドアクセスモードで動作する場合には、登録済みのメンバーにのみサービスを提供する。また、ハイブリッドモードで動作する場合には、登録済みのメンバー、および未登録のメンバーすなわちノンメンバーの両方にサービスを提供する。また、オープンアクセスモードで動作する場合には、マクロ基地局およびピコ基地局と同じ動作をする。 In addition, the femto base station operates in an access mode of open / hybrid / closed. When the femto base station operates in the closed access mode, only registered members (terminals) can be connected. When operating in the closed access mode, the service is provided only to registered members. When operating in the hybrid mode, the service is provided to both registered members and unregistered members, that is, non-members. When operating in the open access mode, the same operation as that of the macro base station and the pico base station is performed.
 [構成および基本動作]
 図1は、本発明の実施の形態に係る無線通信システムの構成を示す図である。
[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a radio communication system according to an embodiment of the present invention.
 図1を参照して、無線通信システム401は、たとえば3GPPで規格化されたLTE(Long Term Evolution)に従う移動体通信システムであり、無線基地局装置101A,101B,101Cを備える。図1では、3つの無線基地局装置を代表的に示しているが、さらに多数の無線基地局装置が設けられてもよい。無線通信システム401は、さらに、コアネットワーク301に設けられたS-GW(Serving Gateway)161と、MME(Mobility Management Entity)162と、P-GW(Packet Data Network Gateway)163とを含む。 Referring to FIG. 1, a radio communication system 401 is a mobile communication system that complies with LTE (Long Term Evolution) standardized by 3GPP, for example, and includes radio base station devices 101A, 101B, and 101C. In FIG. 1, three radio base station apparatuses are representatively shown, but a larger number of radio base station apparatuses may be provided. The wireless communication system 401 further includes an S-GW (Serving Gateway) 161, an MME (Mobility Management Entity) 162, and a P-GW (Packet Data Network Gateway) 163 provided in the core network 301.
 無線端末装置202は、無線基地局装置101A、無線基地局装置101Bまたは無線基地局装置101Cと、S-GW161と、P-GW163とを介してIP網302におけるサーバ等と通信コネクションを確立し、たとえばIP(Internet Protocol)パケットを含む通信データを送受信する。 The wireless terminal device 202 establishes a communication connection with a server in the IP network 302 via the wireless base station device 101A, the wireless base station device 101B or the wireless base station device 101C, the S-GW 161, and the P-GW 163, For example, communication data including an IP (Internet Protocol) packet is transmitted and received.
 より詳細には、無線基地局装置101A,101B,101Cは、無線信号を無線端末装置202と送受信することにより、無線端末装置202との通信を行なう。 More specifically, the wireless base station devices 101A, 101B, and 101C communicate with the wireless terminal device 202 by transmitting and receiving wireless signals to and from the wireless terminal device 202.
 S-GW161は、無線基地局装置101A,101B,101CとIP網302との間に接続されている。S-GW161は、無線基地局装置101A,101B,101C経由で無線端末装置202から受信した通信データをP-GW163経由でIP網302へ送信するとともに、IP網302におけるサーバ等からP-GW163経由で受信した通信データを無線基地局装置101A,101B,101C経由で無線端末装置202へ送信する。 The S-GW 161 is connected between the radio base station apparatuses 101A, 101B, and 101C and the IP network 302. The S-GW 161 transmits communication data received from the wireless terminal device 202 via the wireless base station devices 101A, 101B, and 101C to the IP network 302 via the P-GW 163, and from the server in the IP network 302 via the P-GW 163. The communication data received in (1) is transmitted to the wireless terminal device 202 via the wireless base station devices 101A, 101B, 101C.
 MME162は、無線通信システム401における無線基地局装置101A,101B,101C、および無線端末装置202等を管理する。MME162は、無線基地局装置101A,101B,101Cとの間で制御メッセージを送受信する。 The MME 162 manages the radio base station apparatuses 101A, 101B, 101C, the radio terminal apparatus 202, and the like in the radio communication system 401. The MME 162 transmits and receives control messages to and from the radio base station apparatuses 101A, 101B, and 101C.
 無線基地局装置101A,101B,101Cは、S-GW161およびP-GW163を介してIP網302との間で通信データを送受信する。 The radio base station apparatuses 101A, 101B, and 101C transmit and receive communication data to and from the IP network 302 via the S-GW 161 and the P-GW 163.
 無線基地局装置101A,101B,101CおよびS-GW161は、論理的なインタフェースであるS1-Uインタフェースに従う通信データを互いに送受信することにより、S1-Uインタフェース経由で種々の情報を互いにやりとりする。 The radio base station apparatuses 101A, 101B, 101C and the S-GW 161 exchange various data with each other via the S1-U interface by transmitting and receiving communication data according to the S1-U interface which is a logical interface.
 無線基地局装置101A,101B,101CおよびMME162は、点線で示すように、論理的なインタフェースであるS1-MMEインタフェースに従う通信データを互いに送受信することにより、S1-MMEインタフェース経由で種々の情報を互いにやりとりする。 The radio base station apparatuses 101A, 101B, 101C and the MME 162 transmit and receive communication data according to the S1-MME interface, which is a logical interface, to each other via the S1-MME interface, as indicated by dotted lines. Communicate.
 MME162およびS-GW161は、論理的なインタフェースであるS11インタフェースに従う通信データを互いに送受信することにより、S11インタフェース経由で種々の情報を互いにやりとりする。 The MME 162 and the S-GW 161 exchange various data with each other via the S11 interface by transmitting and receiving communication data according to the S11 interface which is a logical interface.
 S-GW161およびP-GW163は、論理的なインタフェースであるS5インタフェースに従う通信データを互いに送受信することにより、S5インタフェース経由で種々の情報を互いにやりとりする。 The S-GW 161 and the P-GW 163 exchange various data with each other via the S5 interface by transmitting and receiving communication data according to the S5 interface which is a logical interface.
 図2は、本発明の実施の形態に係る無線通信システムにおいて移動動作が行なわれる状況の一例を示す図である。 FIG. 2 is a diagram illustrating an example of a situation where a mobile operation is performed in the wireless communication system according to the embodiment of the present invention.
 図2を参照して、無線基地局装置101A,101B,101Cは、たとえばフェムト基地局、ピコ基地局またはマクロ基地局である。 Referring to FIG. 2, radio base station apparatuses 101A, 101B, and 101C are, for example, femto base stations, pico base stations, or macro base stations.
 無線基地局装置101Aは、セルCAを形成し、セルCA内に存在する無線端末装置202と無線信号を送受信することにより、当該無線端末装置202と通信することが可能である。無線基地局装置101Bは、セルCBを形成し、セルCB内に存在する無線端末装置202と無線信号を送受信することにより、当該無線端末装置202と通信することが可能である。無線基地局装置101Cは、セルCCを形成し、セルCC内に存在する無線端末装置202と無線信号を送受信することにより、当該無線端末装置202と通信することが可能である。 The wireless base station device 101A can communicate with the wireless terminal device 202 by forming a cell CA and transmitting / receiving a wireless signal to / from the wireless terminal device 202 existing in the cell CA. The radio base station apparatus 101B can communicate with the radio terminal apparatus 202 by forming a cell CB and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CB. The radio base station apparatus 101C can communicate with the radio terminal apparatus 202 by forming a cell CC and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CC.
 ここで、無線端末装置202からコアネットワーク301への方向を上り方向と称し、コアネットワーク301から無線端末装置202への方向を下り方向と称する。 Here, the direction from the wireless terminal device 202 to the core network 301 is referred to as an uplink direction, and the direction from the core network 301 to the wireless terminal device 202 is referred to as a downlink direction.
 [セル再選択動作の一例]
 本発明の実施の形態に係る無線通信システムにおける無線基地局装置および無線端末装置は、以下の各シーケンスの各ステップを含むプログラムを図示しないメモリから読み出して実行する。このプログラムは、外部からインストールすることができる。このインストールされるプログラムは、たとえば記録媒体に格納された状態で流通する。
[Example of cell reselection operation]
The radio base station apparatus and the radio terminal apparatus in the radio communication system according to the embodiment of the present invention read and execute a program including each step of the following sequences from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.
 以下、無線端末装置202の移動元の無線基地局装置をサービング基地局とも称し、移動先の無線基地局装置をターゲット基地局とも称する。また、以下では、無線基地局装置101Aがサービング基地局であり、無線基地局装置101Bがターゲット基地局である場合について説明する。 Hereinafter, the source radio base station apparatus of the radio terminal apparatus 202 is also referred to as a serving base station, and the destination radio base station apparatus is also referred to as a target base station. In the following, a case where the radio base station apparatus 101A is a serving base station and the radio base station apparatus 101B is a target base station will be described.
 本発明の実施の形態に係る無線基地局装置では、セル再選択の実行判断に電力測定処理(Measurement)を利用する。この電力測定処理は、たとえば3GPPでは、レイヤ3スタックのRRC(Radio Resource Control)に対応する。 In the radio base station apparatus according to the embodiment of the present invention, power measurement processing (Measurement) is used for determining whether to perform cell reselection. For example, in 3GPP, this power measurement processing corresponds to RRC (Radio Resource Control) of the layer 3 stack.
 ここで、3GPP TS36.133 4.2.2.1章では、セル再選択のためのサービングセルの測定周期について、以下のように記載されている。すなわち、無線端末装置202は、少なくともDRX(Discontinuous Reception)サイクルごとに、サービングセルのRSRP(Reference Signal Received Power)レベルを測定し、TS36.304で定義されるS値(Cell Selection Criterion S)とRSRPレベルとを比較する。 Here, in 3GPP TS36.133 4.2.2.1, the measurement period of the serving cell for cell reselection is described as follows. That is, the radio terminal apparatus 202 measures the RSRP (Reference Signal Received Power) level of the serving cell at least every DRX (Discontinuous Reception) cycle, and determines the S value (Cell Selection Criterion S) defined in TS36.304 and the RSRP level. And compare.
 無線端末装置202は、サービングセルの測定結果を、少なくとも2回の測定でフィルタリングする。このフィルタリングは、平均化であると考えられる。 The wireless terminal device 202 filters the measurement result of the serving cell by at least two measurements. This filtering is considered averaging.
 フィルタリング対象となる上記測定の組のうち、少なくとも2回の測定は、少なくともDRXサイクルの1/2の間隔を空けて実行しなければならない。これは、測定間隔をDRXサイクルの1/2以上にしなければならないことを意味する、と考えられる。 少 な く と も At least two measurements out of the set of measurements to be filtered must be performed with an interval of at least a half of the DRX cycle. This is considered to mean that the measurement interval must be ½ or more of the DRX cycle.
 ここで、3GPP TS36.133 4.2.2.1章の表4.2.2.1-1では、DRXサイクル長[秒]とDRXサイクル数Nservとの対応関係が示されている。具体的には、DRXサイクル長が0.32秒、0.64秒、1.28秒および2.56秒のとき、DRXサイクル数Nservがそれぞれ4,4,2,2である。 Here, in Table 4.2.2.1-1 of 3GPP TS36.133, Chapter 4.2.1.2.1, the correspondence between DRX cycle length [seconds] and the number of DRX cycles Nserv is shown. Specifically, when the DRX cycle length is 0.32 seconds, 0.64 seconds, 1.28 seconds, and 2.56 seconds, the DRX cycle number Nserv is 4, 4, 2, and 2, respectively.
 無線端末装置202は、Nserv回の連続したDRXサイクルにおいて、サービングセルがS値を満たしていない場合には、自己の測定(Measurement)機能が何らかの規制により制限されていない限り、サービング基地局から指定されたすべての周辺セルの測定を開始する。すなわち、無線端末装置202は、一定期間経過すれば、S値が条件を満たしていなくても周辺セルの測定を開始する。 If the serving cell does not satisfy the S value in Nserv consecutive DRX cycles, the radio terminal device 202 is designated by the serving base station unless its measurement function is restricted by some restrictions. Start measuring all neighboring cells. That is, if a certain period of time elapses, the wireless terminal device 202 starts measuring neighboring cells even if the S value does not satisfy the condition.
 このような3GPP TS36.133の記載から、サービングセルの測定周期として最短でも0.16秒(160ms)が必要となり、上記のようなS値の判定には少なくとも2回の測定が必要となる。このため、周辺セルの測定開始判断には、実質0.32秒(320ms)以上の間隔が必要になる。 From the description of 3GPP TS36.133, at least 0.16 seconds (160 ms) is required as the measurement period of the serving cell, and determination of the S value as described above requires at least two measurements. For this reason, an interval of substantially 0.32 seconds (320 ms) or more is necessary for determining the measurement start of the neighboring cells.
 また、S値が条件を満たしていない状態で周辺セルの測定を開始する場合、周辺セルの測定開始判断には0.32秒×4回=1.28秒の間隔が必要になる。 In addition, when measurement of a neighboring cell is started in a state where the S value does not satisfy the condition, an interval of 0.32 seconds × 4 times = 1.28 seconds is necessary for judgment of measurement of neighboring cells.
 3GPP TS36.133 4.2.2.1章では、RSRPについてのみ記載されているが、RSRQ(Reference Signal Receive Quality)についてもRRCに従って測定されることから、RSRPと同様であると考えられる。 In 3GPP TS36.133 4.2.2.1, only RSRP is described, but RSRQ (Reference Signal Signal Quality) is also measured according to RRC, and is considered to be the same as RSRP.
 図3は、本発明の実施の形態に係る無線通信システムにおけるセル再選択動作のシーケンスの一例を示す図である。 FIG. 3 is a diagram showing an exemplary sequence of cell reselection operation in the wireless communication system according to the embodiment of the present invention.
 ここでは、図2に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aを通信相手として選択してから、セルCAおよびセルCBの重複領域へ移動した場合を想定する。 Here, as shown in FIG. 2, the case where the wireless terminal device 202 is located in the cell CA and moves to the overlapping area of the cell CA and the cell CB after selecting the wireless base station device 101A as a communication partner. Suppose.
 再び図3を参照して、まず、無線端末装置202は、無線基地局装置101Aを新たに通信相手として選択することを決定すると、無線基地局装置101Aから送信される報知情報を受信し(ステップS1)、受信した報知情報の内容を保存する(ステップS2)。この報知情報に、周辺セル情報、およびセル再選択を行なうための情報が含まれる。 Referring to FIG. 3 again, first, when wireless terminal apparatus 202 determines to newly select wireless base station apparatus 101A as a communication partner, it receives broadcast information transmitted from wireless base station apparatus 101A (step S1), the content of the received notification information is stored (step S2). This broadcast information includes neighboring cell information and information for performing cell reselection.
 次に、無線端末装置202は、コアネットワーク301におけるMME162等に対して新たなセルCAへ移動したことを通知するため、端末登録処理であるアタッチ処理(Attach Procedure)を実行する(ステップS3)。 Next, in order to notify the MME 162 or the like in the core network 301 that the wireless terminal device 202 has moved to a new cell CA, the wireless terminal device 202 executes an attach process (Attach Procedure) that is a terminal registration process (step S3).
 次に、無線端末装置202は、サービング基地局である無線基地局装置101Aから送信される無線信号の受信電力の測定を開始する。すなわち、無線端末装置202は、サービングセルの受信電力の測定を行なう。たとえば、無線端末装置202は、当該無線信号に含まれるパイロット信号を用いて受信電力を測定する。この測定周期は、たとえば0.16秒である(ステップS4)。 Next, the wireless terminal device 202 starts measuring the received power of the wireless signal transmitted from the wireless base station device 101A that is a serving base station. That is, the wireless terminal device 202 measures the reception power of the serving cell. For example, the wireless terminal device 202 measures received power using a pilot signal included in the wireless signal. This measurement cycle is, for example, 0.16 seconds (step S4).
 次に、無線端末装置202は、サービングセルの評価値であるS値を算出し、S値判定を行なう(ステップS5)。 Next, the wireless terminal device 202 calculates an S value, which is an evaluation value of the serving cell, and performs S value determination (step S5).
 無線端末装置202は、サービングセルのS値が所定条件を満たす場合には(ステップS5でYES)、報知情報の示す周波数において、報知情報の示す周辺基地局から送信される無線信号の受信電力の測定を開始する。ここで、周辺基地局は、サービング基地局以外の他の無線基地局装置101を示す。すなわち、無線端末装置202は、サービングセルに加えて、周辺セルの受信電力の測定を行なう。たとえば、無線端末装置202は、当該無線信号に含まれるパイロット信号を用いて受信電力を測定する(ステップS6)。 When the S value of the serving cell satisfies the predetermined condition (YES in step S5), the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the neighboring base station indicated by the broadcast information at the frequency indicated by the broadcast information. To start. Here, the peripheral base station indicates a radio base station apparatus 101 other than the serving base station. That is, the radio | wireless terminal apparatus 202 measures the reception power of a periphery cell in addition to a serving cell. For example, the wireless terminal device 202 measures received power using a pilot signal included in the wireless signal (step S6).
 次に、無線端末装置202は、周辺セルの評価値であるS値を算出し、S値判定を行なう(ステップS7)。 Next, the wireless terminal device 202 calculates an S value, which is an evaluation value of a neighboring cell, and performs an S value determination (step S7).
 無線端末装置202は、周辺セルのS値が所定条件を満たす場合には(ステップS7でYES)、サービングセルおよび周辺セルの測定結果を用いて、サービングセルおよび周辺セルをたとえば受信電力品質の良い順に順位付けする(ステップS8)。 When the S value of the neighboring cell satisfies the predetermined condition (YES in step S7), the wireless terminal apparatus 202 ranks the serving cell and the neighboring cell in the order of, for example, good reception power quality using the measurement result of the serving cell and the neighboring cell. (Step S8).
 次に、無線端末装置202は、順位付けの結果、最上位のセルがサービングセルでは無かった場合には(ステップS9でYES)、当該最上位セルへのセル再選択を行なう。すなわち、無線端末装置202は、最上位の周辺セルに対応する無線基地局装置、たとえば無線基地局装置101Bを新たに通信相手として選択することを決定する。そして、無線端末装置202は、無線基地局装置101Bからの報知情報を受信し(ステップS10)、受信した報知情報の内容を保存する(ステップS11)。 Next, as a result of the ranking, if the highest cell is not the serving cell (YES in step S9), the wireless terminal device 202 performs cell reselection to the highest cell. That is, radio terminal apparatus 202 determines to newly select a radio base station apparatus corresponding to the highest neighboring cell, for example, radio base station apparatus 101B, as a communication partner. And the radio | wireless terminal apparatus 202 receives the alerting | reporting information from the wireless base station apparatus 101B (step S10), and preserve | saves the content of the received alerting | reporting information (step S11).
 次に、無線端末装置202は、コアネットワーク301におけるMME162等に対して新たなセルCBへ移動したことを通知するため、端末登録処理であるアタッチ処理を実行する(ステップS12)。 Next, in order to notify the MME 162 and the like in the core network 301 that the wireless terminal device 202 has moved to a new cell CB, the wireless terminal device 202 executes an attach process that is a terminal registration process (step S12).
 [ハンドオーバ動作の一例]
 図4は、本発明の実施の形態に係る無線通信システムにおけるハンドオーバ動作のシーケンスの一例を示す図である。
[Example of handover operation]
FIG. 4 is a diagram showing an exemplary sequence of a handover operation in the radio communication system according to the embodiment of the present invention.
 ここでは、図2に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aと通信中である状態から、セルCAおよびセルCBの重複領域へ移動した場合を想定する。 Here, as shown in FIG. 2, it is assumed that radio terminal apparatus 202 moves from the state where it is located in cell CA and communicating with radio base station apparatus 101A to the overlapping area of cell CA and cell CB. To do.
 以下、無線端末装置202と通信中の無線基地局装置またはハンドオーバ元の無線基地局装置をサービング基地局とも称し、ハンドオーバ先の無線基地局装置をターゲット基地局とも称する。また、以下では、無線基地局装置101Aがサービング基地局であり、無線基地局装置101Bがターゲット基地局である場合について説明する。 Hereinafter, a wireless base station device communicating with the wireless terminal device 202 or a handover source wireless base station device is also referred to as a serving base station, and a handover destination wireless base station device is also referred to as a target base station. In the following, a case where the radio base station apparatus 101A is a serving base station and the radio base station apparatus 101B is a target base station will be described.
 再び図4を参照して、まず、無線基地局装置101Aは、自己と通信中の無線端末装置202の測定対象となる周波数と、当該周波数の無線信号を送信する他の無線基地局装置とを設定する(ステップS31)。 Referring to FIG. 4 again, first, radio base station apparatus 101A obtains a frequency to be measured by radio terminal apparatus 202 in communication with itself and another radio base station apparatus that transmits a radio signal of the frequency. Set (step S31).
 次に、無線基地局装置101Aは、設定した他の無線基地局装置から送信される無線信号の受信レベルを無線端末装置202に測定させるための測定開始要求(Measurement Configuration)を無線端末装置202へ送信する。この測定開始要求には、周辺セル情報、すなわち測定対象となる無線基地局装置のセルIDが含まれる。また、この測定開始要求には、各無線基地局装置の送信周波数が含まれる(ステップS32)。 Next, the wireless base station device 101A sends a measurement start request (Measurement Configuration) for causing the wireless terminal device 202 to measure the reception level of the wireless signal transmitted from the other wireless base station device that has been set. Send. This measurement start request includes neighboring cell information, that is, the cell ID of the radio base station apparatus to be measured. Further, the measurement start request includes the transmission frequency of each radio base station apparatus (step S32).
 次に、無線端末装置202は、無線基地局装置101Aから測定開始要求を受信して、電力測定処理(Measurement)を開始する、すなわち受信した測定開始要求の示す周波数において、測定開始要求の示す無線基地局装置から送信される無線信号の受信電力を測定する(ステップS33)。 Next, the wireless terminal device 202 receives the measurement start request from the wireless base station device 101A and starts the power measurement process (Measurement), that is, the wireless indicated by the measurement start request at the frequency indicated by the received measurement start request. The received power of the radio signal transmitted from the base station apparatus is measured (step S33).
 次に、無線端末装置202は、この受信電力の測定結果を示す測定結果通知(Measurement Report)を無線基地局装置101Aへ送信する。たとえば、無線端末装置202は、受信電力の測定を定期的に行ない、無線基地局装置101Aとの通信状態が悪くなった場合、および無線基地局装置101A以外の他の無線基地局装置との通信状態が良くなった場合に、測定結果通知を無線基地局装置101Aへ送信する(ステップS34)。 Next, the wireless terminal device 202 transmits a measurement result notification (Measurement Report) indicating the measurement result of the received power to the wireless base station device 101A. For example, the wireless terminal device 202 periodically measures the received power, when the communication state with the wireless base station device 101A deteriorates, and with other wireless base station devices other than the wireless base station device 101A When the state becomes better, a measurement result notification is transmitted to the radio base station apparatus 101A (step S34).
 次に、無線基地局装置101Aは、無線端末装置202から受信した測定結果通知に基づいて、セルIDごとの測定結果を示す測定情報を取得し、図示しない記憶部に保存する(ステップS35)。 Next, the radio base station apparatus 101A acquires measurement information indicating the measurement result for each cell ID based on the measurement result notification received from the radio terminal apparatus 202, and stores it in a storage unit (not shown) (step S35).
 次に、無線基地局装置101Aは、無線端末装置202から受信した測定結果通知に基づいて、当該無線端末装置202がハンドオーバすべきか否かを判断し、ハンドオーバすべきであると判断すると、周辺セル情報を参照してたとえば無線基地局装置101Bをハンドオーバ先として決定する(ステップS36)。 Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. For example, the radio base station apparatus 101B is determined as a handover destination with reference to the information (step S36).
 次に、無線基地局装置101Aは、無線基地局装置101Bを示すハンドオーバ要求を上位装置へ送信する(ステップS37)。 Next, the radio base station device 101A transmits a handover request indicating the radio base station device 101B to the higher-level device (step S37).
 次に、上位装置は、無線基地局装置101Aからハンドオーバ要求を受信して、無線基地局装置101Bへ当該ハンドオーバ要求を送信する(ステップS38)。 Next, the host device receives the handover request from the radio base station device 101A and transmits the handover request to the radio base station device 101B (step S38).
 次に、無線基地局装置101Bは、上位装置からハンドオーバ要求を受信して、上位装置へ当該ハンドオーバ要求に対するハンドオーバ応答を送信する(ステップS39)。 Next, the radio base station apparatus 101B receives the handover request from the upper apparatus and transmits a handover response to the handover request to the upper apparatus (step S39).
 次に、上位装置は、無線基地局装置101Bからハンドオーバ応答を受信して、無線基地局装置101Aへハンドオーバ指示を送信する(ステップS40)。 Next, the higher-level device receives a handover response from the radio base station device 101B and transmits a handover instruction to the radio base station device 101A (step S40).
 次に、無線基地局装置101Aは、上位装置からハンドオーバ指示を受信して、無線端末装置202へRRC(Radio Resource Control)コネクション再構成指示(RRC Connection Reconfiguration)を送信する(ステップS41)。 Next, the radio base station apparatus 101A receives a handover instruction from the host apparatus and transmits an RRC (Radio Resource Control) connection reconfiguration instruction (RRC Connection Reconfiguration) to the wireless terminal apparatus 202 (step S41).
 次に、無線基地局装置101Aは、上位装置へ自己の通信状態等を示す状態通知を送信する(ステップS42)。 Next, the radio base station device 101A transmits a status notification indicating its own communication status to the higher-level device (step S42).
 次に、上位装置は、無線基地局装置101Aから状態通知を受信して、無線基地局装置101Bへ無線端末装置202との通信内容等を示す状態通知を送信する(ステップS43)。 Next, the higher-level device receives the status notification from the radio base station device 101A and transmits a status notification indicating the communication content with the radio terminal device 202 to the radio base station device 101B (step S43).
 また、無線端末装置202および無線基地局装置101B間でRRCコネクションが確立されると、無線端末装置202は、無線基地局装置101BへRRCコネクション再構成完了通知(RRC Connection Reconfiguration Complete)を送信する(ステップS44)。 When the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRCRRConnection Reconfiguration Complete) to the wireless base station device 101B ( Step S44).
 次に、無線基地局装置101Bは、無線端末装置202からRRCコネクション再構成完了通知を受信して、上位装置へハンドオーバ完了通知を送信する(ステップS45)。 Next, the radio base station device 101B receives the RRC connection reconfiguration completion notification from the radio terminal device 202 and transmits a handover completion notification to the higher-level device (step S45).
 次に、上位装置は、無線基地局装置101Bからハンドオーバ完了通知を受信して、端末情報解放指示を無線基地局装置101Aへ送信する(ステップS46)。 Next, the host device receives a handover completion notification from the radio base station device 101B and transmits a terminal information release instruction to the radio base station device 101A (step S46).
 次に、無線基地局装置101Aは、上位装置から端末情報解放指示を受信して、無線端末装置202に関する情報を解放し、上位装置へ端末情報解放完了通知を送信する(ステップS47)。 Next, the wireless base station device 101A receives the terminal information release instruction from the higher-level device, releases information related to the wireless terminal device 202, and transmits a terminal information release completion notification to the higher-level device (step S47).
 [不適切なハンドオーバ動作の例]
 図5は、本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(Too Late HO)が生じた状況の一例を示す図である。
[Example of inappropriate handover operation]
FIG. 5 is a diagram illustrating an example of a situation where an inappropriate handover operation (Too Late HO) occurs in the wireless communication system according to the embodiment of the present invention.
 図6は、本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(Too Late HO)およびその検出処理のシーケンスの一例を示す図である。 FIG. 6 is a diagram showing an example of an inappropriate handover operation (Too Late HO) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
 ”Too Late HO”は、たとえば以下のような場合をいう。すなわち、ハンドオーバが始まる前、あるいはハンドオーバ処理の最中に、ハンドオーバ元の無線基地局装置について無線リンク断(RLF:Radio Link Failure)が発生し、かつハンドオーバ元の無線基地局装置以外の無線基地局装置に対する無線端末装置202の接続再確立が生じた場合である。 “Too Late HO” refers to the following cases, for example. That is, before handover starts or during handover processing, a radio link disconnection (RLF: Radio Link Failure) occurs in the handover source radio base station apparatus, and a radio base station other than the handover source radio base station apparatus. This is a case where connection re-establishment of the wireless terminal device 202 to the device has occurred.
 ”Too Late HO”の検出方法は、たとえば以下のようになる。すなわち、無線端末装置202が無線基地局装置101AについてRLFを起こした後に無線基地局装置101Bに対して無線リンクを再確立した場合、無線基地局装置101Bが無線基地局装置101Aに対してRLF通知を送信する。これにより、無線基地局装置101Aは”Too Late HO”を検出する。 The detection method of “Too Late HO” is as follows, for example. That is, when the radio terminal device 202 reestablishes the radio link to the radio base station device 101B after causing the RLF for the radio base station device 101A, the radio base station device 101B notifies the radio base station device 101A of the RLF. Send. Thereby, the radio base station apparatus 101A detects “Too Late HO”.
 ここでは、図5に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aと通信中である場合を想定する。 Here, as shown in FIG. 5, it is assumed that the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A.
 図5および図6を参照して、まず、無線端末装置202は、各無線基地局装置から送信される無線信号の受信電力を測定し、測定した受信電力の測定結果を示す測定結果通知を無線基地局装置101Aへ送信する(ステップS51)。 With reference to FIG. 5 and FIG. 6, first, the wireless terminal device 202 measures the received power of the wireless signal transmitted from each wireless base station device, and wirelessly transmits a measurement result notification indicating the measured result of the received power. It transmits to base station apparatus 101A (step S51).
 次に、無線基地局装置101Aは、無線端末装置202から受信した測定結果通知に基づいて、当該無線端末装置202のハンドオーバを行なうべきか否かを判断する。無線基地局装置101Aは、当該無線端末装置202のハンドオーバを行なうべきであると判断すると、周辺セル情報を参照してたとえば無線基地局装置101Bをハンドオーバ先として決定する(ステップS52)。 Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When it is determined that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S52).
 次に、無線基地局装置101Aは、無線基地局装置101Bを示すハンドオーバ要求を、基地局間インタフェースであるX2インタフェース経由で無線基地局装置101Bへ送信する(ステップS53)。 Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an inter-base station interface (step S53).
 次に、無線基地局装置101Bは、無線基地局装置101Aからハンドオーバ要求を受信して、無線基地局装置101Aへ当該ハンドオーバ要求に対するハンドオーバ応答をX2インタフェース経由で送信する(ステップS54)。 Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S54).
 ここで、ネットワーク側のハンドオーバの準備中、すなわち無線基地局装置101Aおよび101Bが上記のようなハンドオーバのためのメッセージの送受信を行っている間に、無線端末装置202が、セルCAの圏外、かつセルCBの圏内に移動する(ステップS55)。 Here, while preparing for handover on the network side, that is, while the radio base station apparatuses 101A and 101B are transmitting and receiving a message for handover as described above, the radio terminal apparatus 202 is out of service area of the cell CA, and Move to within the cell CB (step S55).
 この無線端末装置202の移動により、無線基地局装置101Aから送信されるハンドオーバを指示するためのRRCコネクション再構成指示(ステップS56)が無線端末装置202に届かなくなり、RLFが発生してしまう(ステップS57)。 Due to the movement of the wireless terminal device 202, the RRC connection reconfiguration instruction (step S56) for instructing the handover transmitted from the wireless base station device 101A does not reach the wireless terminal device 202, and RLF is generated (step S56). S57).
 次に、無線端末装置202は、RLF発生を検出すると、無線信号の受信電力の測定等によって周辺の無線基地局装置の探索を行ない、探索した無線基地局装置101Bに再接続するために、RRCコネクション再確立要求(RRC Connection Reestablishment Request)を送信する(ステップS58)。 Next, when the radio terminal apparatus 202 detects the occurrence of RLF, the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101B. A connection re-establishment request (RRC Connection Reestablishment Request) is transmitted (step S58).
 次に、無線基地局装置101Bは、無線端末装置202からRRCコネクション再確立要求を受信して、RRCコネクション再確立応答を無線端末装置202へ送信する(ステップS59)。これにより、無線端末装置202および無線基地局装置101B間でRRCコネクションが確立される。 Next, the radio base station apparatus 101B receives the RRC connection re-establishment request from the radio terminal apparatus 202 and transmits an RRC connection re-establishment response to the radio terminal apparatus 202 (step S59). Thereby, an RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B.
 次に、無線端末装置202は、無線基地局装置101BへRRCコネクション再確立完了通知(RRC Connection Reestablishment Complete)を送信する(ステップS60)。 Next, the wireless terminal device 202 transmits an RRC connection re-establishment completion notification (RRC Connection Reestablishment Complete) to the wireless base station device 101B (step S60).
 このRRCコネクション再確立完了通知は、たとえば”rlf-InfoAvailable”というパラメータを含む。無線端末装置202は、このパラメータを設定してRRCコネクション再確立完了通知を送信する。これにより、無線基地局装置101Bは、当該無線端末装置202についてRLFの発生があったことを認識する。無線基地局装置101Bは、RLFの詳細な情報を取得するため、端末情報要求(UE Information Request)を無線端末装置202へ送信する(ステップS61)。 This RRC connection re-establishment completion notification includes a parameter “rlf-InfoAvailable”, for example. The wireless terminal device 202 sets this parameter and transmits an RRC connection re-establishment completion notification. Thereby, the radio base station apparatus 101B recognizes that an RLF has occurred in the radio terminal apparatus 202. The radio base station apparatus 101B transmits a terminal information request (UE Information Request) to the radio terminal device 202 in order to acquire detailed information of the RLF (step S61).
 次に、無線端末装置202は、無線基地局装置101Bから端末情報要求を受信して、RLFレポートを含む端末情報応答(UE Information Response)を無線基地局装置101Bへ送信する(ステップS62)。RLFレポートは、RLFの発生した無線基地局装置のPCI(Physical Cell ID)、RRCコネクション再確立の発生した無線基地局装置のPCIおよびECGI(E- UTRAN Cell Global Identifier)ならびに自己の無線端末装置202のC-RNTI(Cell Radio Network Temporary Identifier)等を含む。ここでは、RLF発生のPCIは無線基地局装置101AのIDであり、RRCコネクション再確立発生のPCIおよびECGIは無線基地局装置101BのIDであり、C-RNTIは無線基地局装置101Aが付与したIDである。 Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101B, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101B (step S62). The RLF report includes the PCI (Physical Cell ID) of the radio base station device in which the RLF has occurred, the PCI and ECGI (E- UTRAN Cell Global Identifier) of the radio base station device in which the RRC connection has been reestablished, and the own radio terminal device 202. C-RNTI (Cell Radio Network Temporary Identifier) and the like. Here, the PCI of the RLF occurrence is the ID of the radio base station apparatus 101A, the PCI and ECGI of the RRC connection re-establishment occurrence are the ID of the radio base station apparatus 101B, and the C-RNTI is assigned by the radio base station apparatus 101A ID.
 次に、無線基地局装置101Bは、無線端末装置202から受信したRLFレポートのPCIを参照することにより、無線基地局装置101AにおいてRLFが発生したことを認識する。そして、無線基地局装置101Bは、”Too Late HO”であることを通知するために、当該RLFレポートの内容を含むRLF通知(RLF INDICATION)をX2インタフェース経由で無線基地局装置101Aへ送信する(ステップS63)。 Next, the radio base station apparatus 101B recognizes that RLF has occurred in the radio base station apparatus 101A by referring to the PCI of the RLF report received from the radio terminal apparatus 202. The radio base station apparatus 101B then transmits an RLF notification (RLF-INDICATION) including the contents of the RLF report to the radio base station apparatus 101A via the X2 interface in order to notify that it is “Too Late HO” ( Step S63).
 次に、無線基地局装置101Aは、無線基地局装置101Bから受信したRLF通知のPCI、ECGIおよびC-RNTIを参照することにより、セルCBへの”Too Late HO”が発生したことを認識する(ステップS64)。 Next, the radio base station apparatus 101A recognizes that “Too Late HO” has occurred to the cell CB by referring to the PCI, ECGI, and C-RNTI of the RLF notification received from the radio base station apparatus 101B. (Step S64).
 次に、無線基地局装置101Aは、セルCBへの”Too Late HO”の発生が抑制されるように、ハンドオーバ動作の最適化処理を実行する(ステップS65)。 Next, the radio base station apparatus 101A executes a handover operation optimization process so as to suppress the occurrence of “Too Late HO” in the cell CB (step S65).
 図7および図8は、本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(Too Early HO)が生じた状況の一例を示す図である。 7 and 8 are diagrams illustrating an example of a situation in which an inappropriate handover operation (Too Early HO) occurs in the wireless communication system according to the embodiment of the present invention.
 図7および図8を参照して、無線基地局装置101Bの形成するセルCBは、無線基地局装置101Bの設置エリアを含むセルCB1と、セルCA内に形成された、無線基地局装置101Bの設置エリアを含まないセルCB2とで構成される。 7 and 8, cell CB formed by radio base station apparatus 101B includes cell CB1 including the installation area of radio base station apparatus 101B, and radio base station apparatus 101B formed in cell CA. The cell CB2 does not include an installation area.
 図9は、本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(Too Early HO)およびその検出処理のシーケンスの一例を示す図である。 FIG. 9 is a diagram showing an example of an inappropriate handover operation (Too Early HO) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
 ”Too Early HO”は、たとえば以下のような場合をいう。すなわち、無線端末装置202がハンドオーバ先の無線基地局装置に対する接続を成功した後、RLFが短時間で発生し、かつ、ハンドオーバ元の無線基地局装置に対して、当該無線端末装置202の接続再確立が生じた場合である。 “Too Early HO” refers to the following cases, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and the wireless terminal device 202 is reconnected to the handover source wireless base station device. This is the case when establishment occurs.
 ”Too Early HO”の検出方法は、たとえば以下のようになる。すなわち、ハンドオーバ先の無線基地局装置101Bは、RLFレポートをハンドオーバ元の無線基地局装置101Aから受信した場合において、当該受信タイミングからさかのぼって所定時間内に、当該無線端末装置202の自己へのハンドオーバの完了による端末情報開放指示を無線基地局装置101Aへ送信していたときに、”Too Early HO”である旨を無線基地局装置101Aに通知する。 The detection method of “Too Early HO” is as follows, for example. That is, when the handover destination radio base station apparatus 101B receives the RLF report from the handover source radio base station apparatus 101A, the handover to the radio terminal apparatus 202 itself is performed within a predetermined time from the reception timing. When the terminal information release instruction due to the completion of is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “Too Early HO”.
 ここで、無線基地局装置101Bは、上記所定時間を計測するために、タイマを用いる。これにより、無線基地局装置101Bは、RLFレポートを受信した場合において、自己の”Too Late HO”によってRLFが発生したのか、無線基地局装置101Aの”Too Early HO”によってRLFが発生したのかを判別することができる。 Here, the radio base station apparatus 101B uses a timer to measure the predetermined time. As a result, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to the “Too Early HO” of the radio base station apparatus 101A. Can be determined.
 ここでは、図7に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aと通信中である状態から、セルCB2内へ移動した場合(ステップS70)を想定する。 Here, as shown in FIG. 7, a case is assumed in which radio terminal apparatus 202 moves into cell CB2 from a state where it is located in cell CA and is communicating with radio base station apparatus 101A (step S70). .
 図7~図9を参照して、まず、無線端末装置202は、無線基地局装置から送信される無線信号の受信電力を測定し、測定した受信電力の測定結果を示す測定結果通知を無線基地局装置101A(Source eNB, Serving eNB)へ送信する(ステップS71)。 7 to 9, first, the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured received power to the radio base station. Transmit to the station apparatus 101A (Source eNB, Serving eNB) (step S71).
 次に、無線基地局装置101Aは、無線端末装置202から受信した測定結果通知に基づいて、当該無線端末装置202のハンドオーバを行なうべきか否かを判断する。無線基地局装置101Aは、当該無線端末装置202のハンドオーバを行なうべきであると判断すると、周辺セル情報を参照してたとえば無線基地局装置101Bをハンドオーバ先として決定する(ステップS72)。 Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When determining that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S72).
 次に、無線基地局装置101Aは、無線基地局装置101Bを示すハンドオーバ要求を、基地局間インタフェースであるX2インタフェース経由で無線基地局装置101Bへ送信する(ステップS73)。 Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an interface between base stations (step S73).
 次に、無線基地局装置101Bは、無線基地局装置101Aからハンドオーバ要求を受信して、無線基地局装置101Aへ当該ハンドオーバ要求に対するハンドオーバ応答をX2インタフェース経由で送信する(ステップS74)。 Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S74).
 次に、無線基地局装置101Aは、無線基地局装置101Bからハンドオーバ応答を受信して、無線端末装置202へRRCコネクション再構成指示(RRC Connection Reconfiguration)を送信する(ステップS75)。 Next, the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S75).
 次に、無線端末装置202および無線基地局装置101B間でRRCコネクションが確立されると、無線端末装置202は、RRCコネクション再構成完了通知(RRC Connection Reconfiguration Complete)を無線基地局装置101Bへ送信する(ステップS76)。 Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101B. (Step S76).
 次に、無線基地局装置101Bは、無線端末装置202からRRCコネクション再構成完了通知を受信して、端末情報解放指示を無線基地局装置101Aへ送信する(ステップS77)。 Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202 and transmits a terminal information release instruction to the radio base station apparatus 101A (step S77).
 また、無線基地局装置101Bは、無線端末装置202のセルCBにおける滞在時間を計測するために、タイマをスタートさせる(ステップS78)。 Also, the radio base station apparatus 101B starts a timer in order to measure the stay time in the cell CB of the radio terminal apparatus 202 (step S78).
 次に、無線基地局装置101Aは、無線基地局装置101Bから端末情報解放指示を受信して、無線端末装置202に関する情報(UE Context)を解放する(ステップS79)。 Next, the radio base station apparatus 101A receives a terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) on the radio terminal apparatus 202 (step S79).
 以上により、無線端末装置202の無線基地局装置101Aから無線端末装置202Bへのハンドオーバが完了する(ステップS80)。 Thus, the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless terminal device 202B is completed (step S80).
 ここで、無線端末装置202が、測定結果通知(Measurement Report)を無線基地局装置101Bへ送信する前に、セルCBの圏外かつセルCAの圏内に移動する(ステップS81)。 Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101B, the radio terminal apparatus 202 moves outside the cell CB and within the cell CA (step S81).
 そうすると、無線端末装置202は、無線基地局装置101Bと通信できなくなることから、RLFが発生してしまう(ステップS83)。 Then, since the wireless terminal device 202 cannot communicate with the wireless base station device 101B, RLF occurs (step S83).
 次に、無線端末装置202は、RLF発生を検出すると、無線信号の受信電力の測定等によって周辺の無線基地局装置の探索を行ない、探索した無線基地局装置101Aに再接続するために、RRCコネクション再確立要求(RRC Connection Reestablishment Request)を送信する(ステップS84)。 Next, when the radio terminal apparatus 202 detects the occurrence of RLF, the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101A. A connection re-establishment request (RRC Connection Reestablishment Request) is transmitted (step S84).
 次に、無線基地局装置101Aは、当該無線端末装置202に関する情報(UE Context)を解放済みであり、保持していないことから、当該無線端末装置202からのRRCコネクション再確立要求を受け入れることができず(ステップS85)、RRCコネクション再確立拒絶を当該無線端末装置202へ送信する(ステップS86)。 Next, since the radio base station apparatus 101A has released and does not hold the information (UE Context) regarding the radio terminal apparatus 202, the radio base station apparatus 101A can accept the RRC connection re-establishment request from the radio terminal apparatus 202. If it is not possible (step S85), an RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S86).
 次に、無線端末装置202は、RRCコネクション再確立拒絶を無線基地局装置101Aから受信すると、無線基地局装置101Aと通常の接続手順をスタートさせる(ステップS87)。 Next, when receiving the RRC connection re-establishment rejection from the radio base station apparatus 101A, the radio terminal apparatus 202 starts a normal connection procedure with the radio base station apparatus 101A (step S87).
 すなわち、まず、無線端末装置202は、RRCコネクション要求(RRC Connection Request)を無線基地局装置101Aへ送信する(ステップS88)。 That is, first, the wireless terminal device 202 transmits an RRC connection request (RRC Connection Request) to the wireless base station device 101A (step S88).
 次に、無線基地局装置101Aは、無線端末装置202からRRCコネクション要求を受信して、RRCコネクション情報(RRC Connection Setup)を無線端末装置202へ送信する(ステップS89)。 Next, the wireless base station device 101A receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S89).
 次に、無線端末装置202は、無線基地局装置101AからRRCコネクション情報を受信して、RRCコネクション完了通知(RRC Connection Setup Complete)を送信する(ステップS90)。 Next, the radio terminal apparatus 202 receives the RRC connection information from the radio base station apparatus 101A and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S90).
 次に、無線基地局装置101Aは、無線端末装置202からRRCコネクション完了通知を受信して、セキュリティ情報(Security Mode Command)を無線端末装置202へ送信する(ステップS91)。 Next, the radio base station apparatus 101A receives the RRC connection completion notification from the radio terminal apparatus 202, and transmits security information (Security Mode Command) to the radio terminal apparatus 202 (step S91).
 次に、無線端末装置202は、無線基地局装置101Aからセキュリティ情報を受信して、セキュリティ完了通知(Security Mode Complete)を無線基地局装置101Aへ送信する(ステップS92)。 Next, the wireless terminal device 202 receives security information from the wireless base station device 101A, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101A (step S92).
 次に、無線基地局装置101Aは、無線端末装置202へRRCコネクション再構成指示(RRC Connection Reconfiguration)を送信する(ステップS93)。 Next, the radio base station device 101A transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S93).
 次に、無線端末装置202および無線基地局装置101A間でRRCコネクションが確立されると、無線端末装置202は、無線基地局装置101AへRRCコネクション再構成完了通知(RRC Connection Reconfiguration Complete)を送信する(ステップS94)。 Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101A, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101A. (Step S94).
 ここで、RRCコネクション完了通知およびRRCコネクション再構成完了通知は、たとえば”rlf-InfoAvailable”というパラメータを含む。無線端末装置202は、このパラメータを設定してRRCコネクション完了通知およびRRCコネクション再構成完了通知を送信する。これにより、無線基地局装置101Aは、当該無線端末装置202についてRLFの発生があったことを認識する。無線基地局装置101Aは、RLFの詳細な情報を取得するため、端末情報要求(UE Information Request)を無線端末装置202へ送信する(ステップS95)。 Here, the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”. The wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification. As a result, the radio base station apparatus 101A recognizes that an RLF has occurred in the radio terminal apparatus 202. The wireless base station device 101A transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S95).
 次に、無線端末装置202は、無線基地局装置101Aから端末情報要求を受信して、RLFレポートを含む端末情報応答(UE Information Response)を無線基地局装置101Aへ送信する(ステップS96)。RLFレポートは、RLFの発生した無線基地局装置のPCI、RRCコネクション再確立の発生した無線基地局装置のPCIおよびECGIならびに自己の無線端末装置202のC-RNTIを含む。ここでは、RLF発生のPCIは無線基地局装置101BのIDであり、RRCコネクション再確立発生のPCIおよびECGIは無線基地局装置101AのIDであり、C-RNTIは無線基地局装置101Bが付与したIDである。 Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101A, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101A (step S96). The RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF occurrence is the ID of the radio base station apparatus 101B, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101A, and the C-RNTI is assigned by the radio base station apparatus 101B ID.
 次に、無線基地局装置101Aは、無線端末装置202から受信したRLFレポートのPCIを参照することにより、無線基地局装置101BにおいてRLFが発生しことを認識し、セルCAへの”Too Late HO”が発生したと判断する(ステップS97)。 Next, the radio base station apparatus 101A recognizes that RLF has occurred in the radio base station apparatus 101B by referring to the PCI of the RLF report received from the radio terminal apparatus 202, and performs “Too Late HO” to the cell CA. "Is generated (step S97).
 次に、無線基地局装置101Aは、”Too Late HO”であることを通知するために、当該RLFレポートの内容を含むRLF通知(RLF INDICATION)をX2インタフェース経由で無線基地局装置101Bへ送信する(ステップS98)。 Next, in order to notify that it is “Too Late HO”, the radio base station apparatus 101A transmits an RLF notification (RLFRINDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface. (Step S98).
 次に、無線基地局装置101Bは、無線基地局装置101AからRLF通知を受信すると、スタートさせておいたタイマを確認し、タイマが動作している場合、すなわちタイマをスタートさせてから所定時間経過していない場合には、セルCAへの”Too Late HO”ではなく、セルCBへの”Too Early HO”であると判断する。なお、無線基地局装置101Bは、無線基地局装置101AからRLF通知を受信したときにタイマが動作していない場合、すなわちタイマをスタートさせてから上記所定時間経過している場合には、セルCAへの”Too Late HO”であると判断する。 Next, when the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101A, the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined not to be “Too Late HO” to the cell CA but to “Too Early HO” to the cell CB. When the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101A and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CA It is determined that it is “Too Late HO”.
 無線基地局装置101Bは、セルCBへの”Too Early HO”であると判断すると(ステップS99)、ハンドオーバレポートを無線基地局装置101Aへ送信する(ステップS100)。このハンドオーバレポートは、たとえば”Handover Report Type”というパラメータを含む。無線基地局装置101Bは、このパラメータを所定値に設定することにより、”Too Early HO”を無線基地局装置101Aに通知する。 When the radio base station apparatus 101B determines that it is “Too Early HO” to the cell CB (step S99), it transmits a handover report to the radio base station apparatus 101A (step S100). This handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101B notifies the radio base station apparatus 101A of “Too Early HO” by setting this parameter to a predetermined value.
 次に、無線基地局装置101Aは、無線基地局装置101Bから当該ハンドオーバレポートを受信して、セルCBへの”Too Early HO”が発生したことを認識し(ステップS101)、”Too Early HO”の発生が抑制されるように、ハンドオーバ動作の最適化処理を実行する(ステップS102)。 Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “Too Early HO” has occurred to the cell CB (step S101), and “Too Early HO”. The optimization process of the handover operation is executed so as to suppress the occurrence of (step S102).
 図10は、本発明の実施の形態に係る無線通信システムにおいて、不適切なハンドオーバ動作(HO to Wrong Cell)が生じた状況の一例を示す図である。
 図11は、本発明の実施の形態に係る無線通信システムにおける、不適切なハンドオーバ動作(HO to Wrong Cell)およびその検出処理のシーケンスの一例を示す図である。
FIG. 10 is a diagram illustrating an example of a situation in which an inappropriate handover operation (HO to Wron Cell) occurs in the wireless communication system according to the embodiment of the present invention.
FIG. 11 is a diagram showing an example of an improper handover operation (HO to Wron Cell) and its detection processing sequence in the wireless communication system according to the embodiment of the present invention.
 ”HO to Wrong Cell”は、たとえば以下のような場合をいう。すなわち、無線端末装置202がハンドオーバ先の無線基地局装置との接続に成功した後、短時間でRLFが発生し、かつハンドオーバ元およびハンドオーバ先の無線基地局装置以外の無線基地局装置に対する、無線端末装置202の接続再確立が生じた場合である。 “HO to Wong Cell” refers to the following cases, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and wireless communication is performed with respect to wireless base station devices other than the handover source and handover destination wireless base station devices. This is a case where the connection re-establishment of the terminal device 202 occurs.
 ”HO to Wrong Cell”の検出方法は、たとえば以下のようになる。すなわち、ハンドオーバ先の無線基地局装置101Bは、RLFレポートをハンドオーバ元の無線基地局装置101A以外の無線基地局装置101Cから受信した場合において、当該受信タイミングからさかのぼって所定時間内に、当該無線端末装置202の自己へのハンドオーバの完了による端末情報開放指示を無線基地局装置101Aへ送信していたときに、”HO to Wrong Cell”である旨を無線基地局装置101Aに通知する。 For example, the detection method of “HO to Wong Cell” is as follows. That is, when the radio base station apparatus 101B that is the handover destination receives the RLF report from the radio base station apparatus 101C other than the radio base station apparatus 101A that is the handover source, the radio terminal is traced back from the reception timing within a predetermined time. When the terminal information release instruction due to the completion of the handover of the apparatus 202 to itself is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “HO to Wong Cell”.
 ここで、無線基地局装置101Bは、上記所定時間を計測するために、タイマを用いる。これにより、無線基地局装置101Bは、RLFレポートを受信した場合において、自己の”Too Late HO”によってRLFが発生したのか、無線基地局装置101Aの”HO to Wrong Cell”によってRLFが発生したのかを判別することができる。 Here, the radio base station apparatus 101B uses a timer to measure the predetermined time. Thereby, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to the “HO to Wong Cell” of the radio base station apparatus 101A. Can be determined.
 ここでは、図10に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aと通信中である状態から、仮想セルCBVおよびセルCAの重複領域へ移動した場合(ステップS110)を想定する。仮想セルCBVは、無線基地局装置101Aから無線基地局装置101Bへのハンドオーバを促進するために、パラメータであるオフセットOSTに従ってセルCBから拡大された仮想的なセルである。この場合、オフセットOSTは、無線基地局装置101Aの保持するパラメータである。 Here, as shown in FIG. 10, when the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A, the wireless terminal device 202 moves to the overlapping area of the virtual cell CBV and the cell CA ( Assume step S110). The virtual cell CBV is a virtual cell expanded from the cell CB in accordance with the offset OST that is a parameter in order to promote handover from the radio base station apparatus 101A to the radio base station apparatus 101B. In this case, the offset OST is a parameter held by the radio base station apparatus 101A.
 図10および図11を参照して、まず、無線端末装置202は、無線基地局装置から送信される無線信号の受信電力を測定し、測定した受信電力の測定結果を示す測定結果通知を無線基地局装置101Aへ送信する(ステップS111)。 Referring to FIGS. 10 and 11, first, radio terminal apparatus 202 measures the received power of a radio signal transmitted from a radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured received power to radio base station. Transmit to the station apparatus 101A (step S111).
 次に、無線基地局装置101Aは、無線端末装置202から受信した測定結果通知に基づいて、当該無線端末装置202のハンドオーバを行なうべきか否かを判断する。無線基地局装置101Aは、当該無線端末装置202のハンドオーバを行なうべきであると判断すると、周辺セル情報を参照してたとえば無線基地局装置101Bをハンドオーバ先として決定する(ステップS112)。 Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When it is determined that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S112).
 次に、無線基地局装置101Aは、無線基地局装置101Bを示すハンドオーバ要求を、基地局間インタフェースであるX2インタフェース経由で無線基地局装置101Bへ送信する(ステップS113)。 Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an interface between base stations (step S113).
 次に、無線基地局装置101Bは、無線基地局装置101Aからハンドオーバ要求を受信して、無線基地局装置101Aへ当該ハンドオーバ要求に対するハンドオーバ応答をX2インタフェース経由で送信する(ステップS114)。 Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S114).
 次に、無線基地局装置101Aは、無線基地局装置101Bからハンドオーバ応答を受信して、無線端末装置202へRRCコネクション再構成指示(RRC Connection Reconfiguration)を送信する(ステップS115)。 Next, the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal device 202 (step S115).
 次に、無線端末装置202および無線基地局装置101B間でRRCコネクションが確立されると、無線端末装置202は、RRCコネクション再構成完了通知(RRC Connection Reconfiguration Complete)を無線基地局装置101Bへ送信する(ステップS116)。 Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101B. (Step S116).
 次に、無線基地局装置101Bは、無線端末装置202からRRCコネクション再構成完了通知を受信して、端末情報解放指示を無線基地局装置101Aへ送信する(ステップS117)。 Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A (step S117).
 また、無線基地局装置101Bは、無線端末装置202のセルCBにおける滞在時間を計測するために、タイマをスタートさせる(ステップS118)。 Further, the radio base station apparatus 101B starts a timer in order to measure the staying time in the cell CB of the radio terminal apparatus 202 (step S118).
 次に、無線基地局装置101Aは、無線基地局装置101Bから端末情報解放指示を受信して、無線端末装置202に関する情報(UE Context)を解放する(ステップS119)。 Next, the radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (step S119).
 以上により、無線端末装置202の無線基地局装置101Aから無線端末装置202Bへのハンドオーバが完了する(ステップS120)。 As described above, the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless terminal device 202B is completed (step S120).
 ここで、無線端末装置202が、測定結果通知(Measurement Report)を無線基地局装置101Bへ送信する前に、セルCBの圏外、かつ仮想セルCBVおよびセルCCの圏内に移動する(ステップS121)。 Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101B, the radio terminal apparatus 202 moves outside the cell CB and within the virtual cell CBV and cell CC (step S121).
 そうすると、無線端末装置202は、無線基地局装置101C(Other eNB)から送信される無線信号の干渉が大きく、無線基地局装置101Bと通信できなくなることから、RLFが発生してしまう(ステップS123)。 Then, the radio terminal apparatus 202 has a large interference of radio signals transmitted from the radio base station apparatus 101C (Other eNB), and cannot communicate with the radio base station apparatus 101B, so that RLF occurs (step S123). .
 次に、無線端末装置202は、RLF発生を検出すると、無線信号の受信電力の測定等によって周辺の無線基地局装置の探索を行なう。この場合、無線基地局装置101Cからの無線信号の受信電力が最大となることから、無線端末装置202は、探索した無線基地局装置101Cに再接続するために、RRCコネクション再確立要求(RRC Connection Reestablishment Request)を無線基地局装置101Cへ送信する(ステップS124)。 Next, when the radio terminal apparatus 202 detects the occurrence of RLF, the radio terminal apparatus 202 searches for nearby radio base station apparatuses by measuring the reception power of radio signals or the like. In this case, since the reception power of the radio signal from the radio base station apparatus 101C is maximized, the radio terminal apparatus 202 reestablishes an RRC connection reestablishment request (RRCRRConnection) in order to reconnect to the searched radio base station apparatus 101C. Reestablishment (Request) is transmitted to the radio base station apparatus 101C (step S124).
 次に、無線基地局装置101Cは、当該無線端末装置202に関する情報(UE Context)を保持していないことから、当該無線端末装置202からのRRCコネクション再確立要求を受け入れることができず(ステップS125)、RRCコネクション再確立拒絶を当該無線端末装置202へ送信する(ステップS126)。 Next, since the wireless base station device 101C does not hold information (UE Context) regarding the wireless terminal device 202, the wireless base station device 101C cannot accept the RRC connection re-establishment request from the wireless terminal device 202 (step S125). ), RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S126).
 次に、無線端末装置202は、RRCコネクション再確立拒絶を無線基地局装置101Cから受信して、無線基地局装置101Cと通常の接続手順をスタートさせる(ステップS127)。 Next, the radio terminal apparatus 202 receives an RRC connection re-establishment rejection from the radio base station apparatus 101C, and starts a normal connection procedure with the radio base station apparatus 101C (step S127).
 すなわち、まず、無線端末装置202は、RRCコネクション要求(RRC Connection Request)を無線基地局装置101Cへ送信する(ステップS128)。 That is, first, the wireless terminal device 202 transmits an RRC connection request (RRC Connection Request) to the wireless base station device 101C (step S128).
 次に、無線基地局装置101Cは、無線端末装置202からRRCコネクション要求を受信して、RRCコネクション情報(RRC Connection Setup)を無線端末装置202へ送信する(ステップS129)。 Next, the wireless base station device 101C receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S129).
 次に、無線端末装置202は、無線基地局装置101CからRRCコネクション情報を受信して、RRCコネクション完了通知(RRC Connection Setup Complete)を送信する(ステップS130)。 Next, the wireless terminal device 202 receives RRC connection information from the wireless base station device 101C, and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S130).
 次に、無線基地局装置101Cは、無線端末装置202からRRCコネクション完了通知を受信して、セキュリティ情報(Security Mode Command)を無線端末装置202へ送信する(ステップS131)。 Next, the wireless base station device 101C receives the RRC connection completion notification from the wireless terminal device 202, and transmits security information (Security Mode Command) to the wireless terminal device 202 (step S131).
 次に、無線端末装置202は、無線基地局装置101Cからセキュリティ情報を受信して、セキュリティ完了通知(Security Mode Complete)を無線基地局装置101Cへ送信する(ステップS132)。 Next, the wireless terminal device 202 receives the security information from the wireless base station device 101C, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101C (step S132).
 次に、無線基地局装置101Cは、無線端末装置202へRRCコネクション再構成指示(RRC Connection Reconfiguration)を送信する(ステップS133)。 Next, the wireless base station device 101C transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the wireless terminal device 202 (step S133).
 次に、無線端末装置202および無線基地局装置101C間でRRCコネクションが確立されると、無線端末装置202は、無線基地局装置101CへRRCコネクション再構成完了通知(RRC Connection Reconfiguration Complete)を送信する(ステップS134)。 Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101C. (Step S134).
 ここで、RRCコネクション完了通知およびRRCコネクション再構成完了通知は、たとえば”rlf-InfoAvailable”というパラメータを含む。無線端末装置202は、このパラメータを設定してRRCコネクション完了通知およびRRCコネクション再構成完了通知を送信する。これにより、無線基地局装置101Cは、当該無線端末装置202についてRLFの発生があったことを認識する。無線基地局装置101Cは、RLFの詳細な情報を取得するため、端末情報要求(UE Information Request)を無線端末装置202へ送信する(ステップS135)。 Here, the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”. The wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification. Thereby, the radio base station apparatus 101C recognizes that an RLF has occurred in the radio terminal apparatus 202. The wireless base station device 101C transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S135).
 次に、無線端末装置202は、無線基地局装置101Cから端末情報要求を受信して、RLFレポートを含む端末情報応答(UE Information Response)を無線基地局装置101Cへ送信する(ステップS136)。RLFレポートは、RLFの発生した無線基地局装置のPCI、RRCコネクション再確立の発生した無線基地局装置のPCIおよびECGIならびに自己の無線端末装置202のC-RNTIを含む。ここでは、RLF発生のPCIは無線基地局装置101BのIDであり、RRCコネクション再確立発生のPCIおよびECGIは無線基地局装置101CのIDであり、C-RNTIは無線基地局装置101Bが付与したIDである。 Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101C, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101C (step S136). The RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF occurrence is the ID of the radio base station apparatus 101B, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101C, and the C-RNTI is assigned by the radio base station apparatus 101B ID.
 次に、無線基地局装置101Cは、無線端末装置202から受信したRLFレポートのPCIを参照することにより、無線基地局装置101BにおいてRLFが発生しことを認識し、セルCCへの”Too Late HO”が発生したと判断する(ステップS137)。 Next, the wireless base station device 101C recognizes that RLF has occurred in the wireless base station device 101B by referring to the PCI of the RLF report received from the wireless terminal device 202, and performs “Too Late HO” to the cell CC. "Is generated (step S137).
 次に、無線基地局装置101Cは、”Too Late HO”であることを通知するために、当該RLFレポートの内容を含むRLF通知(RLF INDICATION)をX2インタフェース経由で無線基地局装置101Bへ送信する(ステップS138)。 Next, in order to notify that the radio base station apparatus 101C is “Too Late HO”, the radio base station apparatus 101B transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface. (Step S138).
 次に、無線基地局装置101Bは、無線基地局装置101CからRLF通知を受信すると、スタートさせておいたタイマを確認し、タイマが動作している場合、すなわちタイマをスタートさせてから所定時間経過していない場合には、セルCCへの”Too Late HO”ではないと判断し、さらに、無線基地局装置101A以外の無線基地局装置101CからRLF通知を受信したことから、セルCBへの”Too Early HO”ではなく、セルCBへの”HO to Wrong Cell”であると判断する。なお、無線基地局装置101Bは、無線基地局装置101CからRLF通知を受信したときにタイマが動作していない場合、すなわちタイマをスタートさせてから上記所定時間経過している場合には、セルCCへの”Too Late HO”であると判断する。 Next, when the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101C, the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” to the cell CC, and further, the RLF notification is received from the radio base station device 101C other than the radio base station device 101A. It is determined that it is not “Too Early HO” but “HO to Wron Cell” to the cell CB. When the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101C and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CC It is determined that it is “Too Late HO”.
 無線基地局装置101Bは、セルCBへの”HO to Wrong Cell”であると判断すると(ステップS139)、ハンドオーバレポートを無線基地局装置101Aへ送信する(ステップS140)。このハンドオーバレポートは、たとえば”Handover Report Type”というパラメータを含む。無線基地局装置101Bは、このパラメータを所定値に設定することにより、”HO to Wrong Cell”を無線基地局装置101Aに通知する。 If the radio base station apparatus 101B determines that it is “HO to Wong Cell” to the cell CB (step S139), it transmits a handover report to the radio base station apparatus 101A (step S140). This handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101B notifies the radio base station apparatus 101A of “HO to Wong Cell” by setting this parameter to a predetermined value.
 次に、無線基地局装置101Aは、無線基地局装置101Bから当該ハンドオーバレポートを受信して、セルCBへの”HO to Wrong Cell”が発生したことを認識し(ステップS141)、”HO to Wrong Cell”の発生が抑制されるように、ハンドオーバ動作の最適化処理を実行する(ステップS142)。 Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “HO to Wong Cell” has occurred to the cell CB (step S141), and performs “HO to Wong”. The optimization process of the handover operation is executed so that the occurrence of “Cell” is suppressed (step S142).
 以上のような”Too Late HO”、”Too Early HO”および”HO to Wrong Cell”の他に、不適切なハンドオーバ動作として”Ping Pong HO”がある。 In addition to “Too Late HO”, “Too Early HO”, and “HO to Wong Cell” as described above, there is “Ping Pong HO” as an inappropriate handover operation.
 これは、ある無線端末装置について、2つの無線基地局装置が互いに他の無線基地局装置へのハンドオーバを判断する場合である。この”Ping Pong HO”が発生すると、無線端末装置および無線基地局装置間の接続が切断されることはないが、当該無線端末装置についてはハンドオーバ動作のための処理が繰り返され、通話およびデータ通信を行なうことができなくなり、また、上位ネットワーク側の負荷が増大してしまう。 This is a case where two radio base station apparatuses determine a handover to another radio base station apparatus for a certain radio terminal apparatus. When this “Ping Pong HO” occurs, the connection between the wireless terminal device and the wireless base station device will not be cut off, but the processing for the handover operation is repeated for the wireless terminal device, and communication and data communication are performed. Cannot be performed, and the load on the upper network side increases.
 [ハンドオーバ動作の制御パラメータ]
 図12は、本発明の実施の形態に係る無線通信システムにおける、無線端末装置の受信品質のシミュレーション結果を示す図である。
[Control parameters for handover operation]
FIG. 12 is a diagram illustrating a reception quality simulation result of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
 図12は、無線端末装置202が、時速30kmでピコ基地局付近を通過し、マクロ基地局付近を通過するまでの100秒間における無線端末装置202のRSSI(Received Signal Strength Indication)を示している。 FIG. 12 shows the RSSI (Received Signal Strength Strength Indication) of the wireless terminal device 202 for 100 seconds until the wireless terminal device 202 passes near the pico base station at a speed of 30 km per hour and passes near the macro base station.
 図12において、グラフG1およびG3は、マクロ基地局から送信される無線信号のRSSIを示し、グラフG2およびG4は、ピコ基地局から送信される無線信号のRSSIを示している。また、グラフG1およびG2は、シャドウィング、すなわち無線端末装置202および他の物体間の相対的な位置変化に起因する、当該無線端末装置202における無線信号の受信電力の時間的な変化を考慮したシミュレーション結果であり、グラフG3およびG4は、シャドウィングを考慮しないシミュレーション結果である。 12, graphs G1 and G3 indicate RSSIs of radio signals transmitted from the macro base station, and graphs G2 and G4 indicate RSSIs of radio signals transmitted from the pico base station. The graphs G1 and G2 take into account the temporal change in the received power of the radio signal in the radio terminal device 202 caused by shadowing, that is, the relative position change between the radio terminal device 202 and other objects. Simulation results, and graphs G3 and G4 are simulation results that do not consider shadowing.
 図12を参照して、無線端末装置202のピコ基地局からマクロ基地局へのハンドオーバの理想位置は、グラフの交点付近すなわち移動時間が約17秒となる位置である。しかしながら、実際には、無線端末装置202の未来の通信環境を無線通信システムにおいて把握することは困難であるため、各種測定結果等に基づいてハンドオーバ動作のタイミングを調整することにより、ハンドオーバ動作の最適化を図ることが重要である。 Referring to FIG. 12, the ideal position for handover of the wireless terminal device 202 from the pico base station to the macro base station is the vicinity of the intersection of the graph, that is, the position where the movement time is about 17 seconds. However, in practice, it is difficult to grasp the future communication environment of the wireless terminal device 202 in the wireless communication system. Therefore, it is possible to optimize the handover operation by adjusting the timing of the handover operation based on various measurement results. It is important to make it easier.
 また、移動時間が15秒から20秒の期間では、各無線基地局装置からの無線信号の強弱が入り組んでいるため、たとえば”Too Early HO”または”Ping Pong HO”が発生しやすくなる。また、移動時間が20秒となるタイミング付近では、ピコ基地局からの無線信号の受信電力が急に小さくなり、マクロ基地局からの無線信号の受信電力が急に大きくなり、SINR(Signal to Interference-plus-Noise Ratio)が急激に悪化するため、”Too Late HO”が発生しやすくなる。 In addition, since the radio signal from each radio base station apparatus is intricate in the travel time of 15 to 20 seconds, for example, “Too Early HO” or “Ping Pong HO” is likely to occur. Also, near the timing when the movement time is 20 seconds, the reception power of the radio signal from the pico base station suddenly decreases, the reception power of the radio signal from the macro base station suddenly increases, and SINR (Signal to Interference -plus-Noise (Ratio) is abruptly deteriorated, and “Too Late HO” is likely to occur.
 ここで、3GPPで規定されたハンドオーバの最適化を図るMRO(Mobility Robustness Optimization)の評価関数をY=MRO(X)とすると、Yは、たとえば”Too Late HO”の発生頻度、”Too Early HO”の発生頻度、”HO to Wrong Cell”の発生頻度、”Ping Pong HO”等の不必要なハンドオーバの発生頻度、またはRRCコネクション情報を送信した直後すなわち無線端末装置202が無線基地局装置に接続された直後のハンドオーバの発生頻度である。 Here, assuming that the evaluation function of MRO (Mobility Robustness Optimization) that optimizes handover specified in 3GPP is Y = MRO (X), Y is, for example, the occurrence frequency of “Too Late HO”, “Too Early HO” “Occurrence frequency”, “HO to Wong Cell” occurrence frequency, “Ping Pong HO” unnecessary handover occurrence frequency, etc. Immediately after transmitting the RRC connection information, that is, the radio terminal device 202 connects to the radio base station device This is the frequency of occurrence of handover immediately after being performed.
 また、たとえば、Xは、電力測定処理(Measurement)用のパラメータであり、ヒステリシスHS:0dB~+15dB、TTT(Time to Trigger):0ms~5120ms、またはオフセットOST(Cell Individual Offset):-24dB~+24dBである。あるいは、Xは、セル再選択処理用のパラメータである。 Further, for example, X is a parameter for power measurement processing (Measurement), and hysteresis HS: 0 dB to +15 dB, TTT (Time to) Trigger): 0 ms to 5120 ms, or offset OST (Cell Individual Offset): −24 dB to +24 dB It is. Alternatively, X is a parameter for cell reselection processing.
 たとえば、ヒステリシスHSおよびTTTは後述するイベントごとに設定可能であり、オフセットOSTはサービング基地局の形成するサービングセル、および周辺セルごとに設定可能であり、後述するギャップMGおよびフィルタリング係数αはサービングセルごとに設定可能である。 For example, the hysteresis HS and TTT can be set for each event described later, the offset OST can be set for each serving cell formed by the serving base station and each neighboring cell, and the gap MG and the filtering coefficient α described later can be set for each serving cell. It can be set.
 ここでは、無線基地局装置は、無線端末装置202の上り送信負荷を軽減するために、測定結果通知(Measurement Report)を受信するとハンドオーバの判断を行なうものとする。すなわち、測定結果通知の送信タイミングとハンドオーバのタイミングとが対応するものとする。 Here, it is assumed that, in order to reduce the uplink transmission load of the wireless terminal device 202, the wireless base station device determines handover when receiving a measurement result notification (Measurement Report). That is, the transmission timing of the measurement result notification corresponds to the handover timing.
 以下、測定結果通知を送信する各種イベントと電力測定処理のパラメータとの関係について説明する。 Hereinafter, the relationship between various events for transmitting the measurement result notification and the parameters of the power measurement process will be described.
 図13は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA1を示す図である。図13において、横軸は時間であり、縦軸は無線端末装置202における無線信号の受信電力またはSINRであり、SVCはサービングセルの受信電力またはSINRすなわちサービング基地局が送信する無線信号の受信電力またはSINRである。 FIG. 13 is a diagram showing an event A1 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. In FIG. 13, the horizontal axis is time, the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202, and the SVC is the reception power or SINR of the serving cell, that is, the reception power of the radio signal transmitted by the serving base station or SINR.
 図13を参照して、イベントA1では、閾値Thに対して正負の方向にヒステリシスHSが設定される。 Referring to FIG. 13, at event A1, hysteresis HS is set in a positive or negative direction with respect to threshold value Th.
 無線端末装置202は、サービングセルの受信電力またはSINRが(Th+HS)よりも大きくなると、レポートオン状態へ遷移する(タイミングT1)。 When the received power or SINR of the serving cell becomes larger than (Th + HS), the wireless terminal device 202 transitions to the report on state (timing T1).
 そして、無線端末装置202は、受信電力またはSINRが(Th-HS)よりも大きい、という条件が満たされた状態でタイミングT1からTTT経過すると、測定結果通知を送信する(タイミングT2)。 Then, when TTT elapses from timing T1 in a state where the condition that the received power or SINR is greater than (Th-HS) is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T2).
 次に、無線端末装置202は、当該条件が満たされた状態でタイミングT2からTTT経過すると、測定結果通知を送信する(タイミングT3)。 Next, when TTT elapses from timing T2 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T3).
 次に、無線端末装置202は、タイミングT3からTTT経過するまでに当該条件が満たされなくなると、測定結果通知を送信せず、レポートオフ状態へ遷移する(タイミングT4)。 Next, when the condition is not satisfied before TTT elapses from timing T3, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T4).
 ここで、無線端末装置202は、レポートオン状態およびレポートオフ状態間の遷移とは無関係に、たとえば周期的に電力測定処理を行なっており、直近の測定結果を測定結果通知として送信する。また、たとえば、無線端末装置202は、受信電力およびSINRの各々について独立にレポートオン状態およびレポートオフ状態間の遷移を行なう。すなわち、無線端末装置202は、受信電力およびSINRの一方について条件を満たせば、測定結果通知を送信する。 Here, the wireless terminal device 202 performs a power measurement process periodically, for example, regardless of the transition between the report-on state and the report-off state, and transmits the latest measurement result as a measurement result notification. Further, for example, radio terminal apparatus 202 performs transition between the report-on state and the report-off state independently for each of received power and SINR. That is, the wireless terminal device 202 transmits a measurement result notification if a condition is satisfied for one of the received power and SINR.
 図14は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA2を示す図である。図の見方は図13と同様である。 FIG. 14 is a diagram showing an event A2 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
 図14を参照して、イベントA2では、閾値Thに対して正負の方向にヒステリシスHSが設定される。 Referring to FIG. 14, at event A2, hysteresis HS is set in a positive or negative direction with respect to threshold value Th.
 無線端末装置202は、サービングセルの受信電力またはSINRが(Th-HS)よりも小さくなると、レポートオン状態へ遷移する(タイミングT11)。 When the received power or SINR of the serving cell becomes smaller than (Th-HS), the wireless terminal device 202 transitions to the report on state (timing T11).
 そして、無線端末装置202は、受信電力またはSINRが(Th+HS)よりも小さい、という条件が満たされた状態でタイミングT11からTTT経過すると、測定結果通知を送信する(タイミングT12)。 The wireless terminal device 202 transmits a measurement result notification when TTT elapses from timing T11 in a state where the condition that the received power or SINR is smaller than (Th + HS) is satisfied (timing T12).
 次に、無線端末装置202は、当該条件が満たされた状態でタイミングT12からTTT経過すると、測定結果通知を送信する(タイミングT13)。 Next, when TTT has elapsed from timing T12 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T13).
 次に、無線端末装置202は、タイミングT13からTTT経過するまでに当該条件が満たされなくなると、測定結果通知を送信せず、レポートオフ状態へ遷移する(タイミングT14)。 Next, when the condition is not satisfied before TTT elapses from timing T13, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T14).
 図15は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA3を示す図である。図15において、横軸は時間であり、縦軸は無線端末装置202における無線信号の受信電力またはSINRであり、SVCはサービングセルの受信電力またはSINRであり、NBCは周辺セルの受信電力またはSINRすなわち周辺基地局が送信する無線信号の受信電力またはSINRである。 FIG. 15 is a diagram showing an event A3 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. In FIG. 15, the horizontal axis is time, the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202, the SVC is the reception power or SINR of the serving cell, and the NBC is the reception power or SINR of the neighboring cell. This is the reception power or SINR of a radio signal transmitted by a neighboring base station.
 図15を参照して、イベントA3では、サービングセルの受信電力またはSINRに対してオフセットOST1が正方向に設定されており、さらに、正負の方向にヒステリシスHSが設定される。また、周辺セルの受信電力またはSINRに対してオフセットOST2が正方向に設定される。 Referring to FIG. 15, at event A3, offset OST1 is set in the positive direction with respect to the reception power or SINR of the serving cell, and hysteresis HS is set in the positive and negative directions. Also, the offset OST2 is set in the positive direction with respect to the reception power or SINR of the neighboring cells.
 無線端末装置202は、{(周辺セルの受信電力またはSINR)+OST2}が{(サービングセルの受信電力またはSINR)+OST1+HS}よりも大きくなると、レポートオン状態へ遷移する(タイミングT21)。 The wireless terminal device 202 transitions to the report-on state when {(reception power or SINR of neighboring cells) + OST2} becomes larger than {(reception power or SINR of the serving cell) + OST1 + HS} (timing T21).
 そして、無線端末装置202は、{(周辺セルの受信電力またはSINR)+OST2}が{(サービングセルの受信電力またはSINR)+OST1-HS}よりも大きい、という条件が満たされた状態でタイミングT21からTTT経過すると、測定結果通知を送信する(タイミングT22)。 Then, the wireless terminal device 202 performs the processing from the timing T21 to the TTT in a state where {(neighboring cell received power or SINR) + OST2} is larger than {(serving cell received power or SINR) + OST1-HS}. When the time has elapsed, a measurement result notification is transmitted (timing T22).
 次に、無線端末装置202は、当該条件が満たされた状態でタイミングT22からTTT経過すると、測定結果通知を送信する(タイミングT23)。 Next, when TTT has elapsed from timing T22 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T23).
 次に、無線端末装置202は、タイミングT23からTTT経過するまでに当該条件が満たされなくなると、測定結果通知を送信せず、レポートオフ状態へ遷移する(タイミングT24)。 Next, when the condition is not satisfied before TTT elapses from timing T23, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T24).
 図16は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA4を示す図である。図の見方は図15と同様である。 FIG. 16 is a diagram showing an event A4 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
 図16を参照して、イベントA4では、周辺セルの受信電力またはSINRに対してオフセットOSTが正方向に設定されており、閾値Thに対して正負の方向にヒステリシスHSが設定される。 Referring to FIG. 16, in event A4, the offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cells, and the hysteresis HS is set in the positive and negative direction with respect to the threshold Th.
 無線端末装置202は、{(周辺セルの受信電力またはSINR)+OST}が(Th+HS)よりも大きくなると、レポートオン状態へ遷移する(タイミングT31)。 Wireless terminal apparatus 202 transitions to a report-on state when {(reception power or SINR of neighboring cells) + OST} is greater than (Th + HS) (timing T31).
 そして、無線端末装置202は、{(周辺セルの受信電力またはSINR)+OST}が(Th-HS)よりも大きい、という条件が満たされた状態でタイミングT31からTTT経過すると、測定結果通知を送信する(タイミングT32)。 Then, wireless terminal apparatus 202 transmits a measurement result notification when TTT elapses from timing T31 while the condition that {(reception power or SINR of the neighboring cell) + OST} is larger than (Th−HS) is satisfied. (Timing T32).
 次に、無線端末装置202は、当該条件が満たされた状態でタイミングT32からTTT経過すると、測定結果通知を送信する(タイミングT33)。 Next, when TTT has elapsed from timing T32 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T33).
 次に、無線端末装置202は、タイミングT33からTTT経過するまでに当該条件が満たされなくなると、測定結果通知を送信せず、レポートオフ状態へ遷移する(タイミングT34)。 Next, when the condition is not satisfied before TTT elapses from timing T33, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T34).
 図17は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が測定結果通知を送信するイベントA5を示す図である。図の見方は図15と同様である。 FIG. 17 is a diagram showing an event A5 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the embodiment of the present invention. The way of viewing the figure is the same as in FIG.
 図17を参照して、イベントA5では、周辺セルの受信電力またはSINRに対してオフセットOSTが正方向に設定されており、閾値Th1に対して正負の方向にヒステリシスHS1が設定されており、閾値Th2に対して正負の方向にヒステリシスHS2が設定される。 Referring to FIG. 17, at event A5, the offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cell, and the hysteresis HS1 is set in the positive and negative direction with respect to the threshold Th1. Hysteresis HS2 is set in the positive and negative directions with respect to Th2.
 無線端末装置202は、サービングセルの受信電力またはSINRが(Th1-HS1)よりも小さくなり、かつ{(周辺セルの受信電力またはSINR)+OST}が(Th2+HS2)よりも大きくなると、レポートオン状態へ遷移する(タイミングT41)。 When the received power or SINR of the serving cell becomes smaller than (Th1-HS1) and {(reception power or SINR of neighboring cells) + OST} becomes larger than (Th2 + HS2), the wireless terminal device 202 transitions to the report on state. (Timing T41).
 そして、無線端末装置202は、サービングセルの受信電力またはSINRが(Th1+HS1)よりも小さく、かつ{(周辺セルの受信電力またはSINR)+OST}が(Th2-HS2)よりも大きい、という条件が満たされた状態でタイミングT41からTTT経過すると、測定結果通知を送信する(タイミングT42)。 Radio terminal 202 satisfies the condition that the reception power or SINR of the serving cell is smaller than (Th1 + HS1) and {(reception power or SINR of the neighboring cell) + OST} is larger than (Th2-HS2). When TTT elapses from timing T41 in a state where it is in a state, a measurement result notification is transmitted (timing T42).
 次に、無線端末装置202は、タイミングT42からTTT経過するまでに当該条件が満たされなくなると、測定結果通知を送信せず、レポートオフ状態へ遷移する(タイミングT43)。 Next, when the condition is not satisfied before TTT elapses from timing T42, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T43).
 以上のように、イベントA1~A5で説明したパラメータ、すなわちヒステリシスHS、TTTおよびオフセットOSTを調整すれば、無線端末装置202のハンドオーバ動作のタイミングを制御することが可能である。 As described above, the timing of the handover operation of the wireless terminal device 202 can be controlled by adjusting the parameters described in the events A1 to A5, that is, the hysteresis HS, TTT, and the offset OST.
 図18は、本発明の実施の形態に係る無線通信システムにおいて、ヒステリシスHSの調整によるハンドオーバ動作のタイミング制御を示す図である。図18は、イベントA3の場合を示す。 FIG. 18 is a diagram showing timing control of the handover operation by adjusting the hysteresis HS in the wireless communication system according to the embodiment of the present invention. FIG. 18 shows the case of event A3.
 図18を参照して、ヒステリシスHSをゼロに設定した場合には、タイミングT51においてレポ-トオン状態へ遷移し、タイミングT53において測定結果通知が送信され、タイミングT55においてレポートオフ状態へ遷移する。 Referring to FIG. 18, when hysteresis HS is set to zero, a transition is made to the report on state at timing T51, a measurement result notification is transmitted at timing T53, and a transition to the report off state is made at timing T55.
 これに対して、ヒステリシスHSをゼロより大きく設定した場合には、タイミングT51より後のタイミングT52においてレポ-トオン状態へ遷移し、タイミングT53より後のタイミングT54において測定結果通知が送信され、タイミングT55より後のタイミングT56においてレポートオフ状態へ遷移する。 On the other hand, when the hysteresis HS is set larger than zero, the state transits to the report-on state at timing T52 after timing T51, the measurement result notification is transmitted at timing T54 after timing T53, and timing T55. At a later timing T56, the state transits to the report off state.
 すなわち、ヒステリシスHSを大きくすると、測定結果通知の送信タイミングすなわちハンドオーバ動作のタイミングを遅くすることができる。 That is, when the hysteresis HS is increased, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed.
 図19は、本発明の実施の形態に係る無線通信システムにおいて、TTTの調整によるハンドオーバ動作のタイミング制御を示す図である。図19は、イベントA3の場合を示す。 FIG. 19 is a diagram showing handover operation timing control by adjusting TTT in the wireless communication system according to the embodiment of the present invention. FIG. 19 shows the case of event A3.
 図19を参照して、TTTを小さく設定した場合には、タイミングT62において測定結果通知が送信される。 Referring to FIG. 19, when TTT is set small, a measurement result notification is transmitted at timing T62.
 これに対して、TTTを大きく設定した場合には、タイミングT61より後のタイミングT63において測定結果通知が送信される。 On the other hand, when TTT is set large, a measurement result notification is transmitted at timing T63 after timing T61.
 すなわち、TTTを大きくすると、測定結果通知の送信タイミングすなわちハンドオーバ動作のタイミングを遅くすることができる。 That is, when the TTT is increased, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed.
 図20は、本発明の実施の形態に係る無線通信システムにおいて、オフセットOSTの調整によるハンドオーバ動作のタイミング制御を示す図である。図20は、イベントA3の場合を示す。 FIG. 20 is a diagram showing timing control of the handover operation by adjusting the offset OST in the wireless communication system according to the embodiment of the present invention. FIG. 20 shows the case of event A3.
 図20を参照して、オフセットOSTをゼロに設定した場合には、タイミングT71においてレポ-トオン状態へ遷移し、タイミングT73において測定結果通知が送信され、タイミングT76においてレポートオフ状態へ遷移する。 Referring to FIG. 20, when offset OST is set to zero, a transition is made to the report on state at timing T71, a measurement result notification is transmitted at timing T73, and a transition to the report off state is made at timing T76.
 これに対して、オフセットOSTをゼロより小さく設定した場合には、タイミングT71より後のタイミングT72においてレポ-トオン状態へ遷移し、タイミングT73より後のタイミングT74において測定結果通知が送信され、タイミングT76より前のタイミングT75においてレポートオフ状態へ遷移する。 On the other hand, when the offset OST is set to be smaller than zero, the state transits to the report on state at timing T72 after timing T71, the measurement result notification is transmitted at timing T74 after timing T73, and timing T76. Transition to the report-off state at an earlier timing T75.
 すなわち、オフセットOSTを小さくすると、測定結果通知の送信タイミングすなわちハンドオーバ動作のタイミングを遅くすることができる。 That is, if the offset OST is reduced, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed.
 以上のように、ヒステリシスHSを大きくするか、TTTを大きくするか、あるいはオフセットOSTを小さくすることにより、ハンドオーバ動作のタイミングが遅くなる。すなわち、無線端末装置202がサービング基地局に接続される時間が長くなることから、”Too Early HO”、”HO to Wrong Cell”および”Ping Pong HO”の発生頻度が減り、”Too Late HO”の発生頻度が増えることになる。 As described above, the timing of the handover operation is delayed by increasing the hysteresis HS, increasing the TTT, or decreasing the offset OST. That is, since the time for which the wireless terminal device 202 is connected to the serving base station becomes longer, the occurrence frequency of “Too Early HO”, “HO to Wong Cell” and “Ping Pong HO” is reduced, and “Too Late HO” The frequency of occurrence will increase.
 ここで、ヒステリシスHS、TTTおよびオフセットOSTを調整する効果の違いについて考察する。 Here, the difference in the effect of adjusting the hysteresis HS, TTT and offset OST will be considered.
 いずれのパラメータを調整しても、ハンドオーバのタイミングを調整することができるが、これらの効果は、干渉を含む地形、および無線端末装置の移動速度等によって異なる。 The handover timing can be adjusted by adjusting any of the parameters, but these effects differ depending on the topography including interference, the moving speed of the wireless terminal device, and the like.
 ヒステリシスHSおよびオフセットOSTを調整することは、セルを仮想的に大きくしたり小さくしたりして、ハンドオーバの行なわれる位置を調整することに相当する。たとえば、サービングセルのヒステリシスHSを大きくすることにより、無線信号の受信電力を大きく見せて、他セルへのハンドオーバが行なわれにくくする。また、周辺セルのオフセットOSTを負の値に設定することにより、周辺セルからの無線信号の受信電力を小さく見せて、他セルへのハンドオーバが行なわれにくくする。 Adjusting the hysteresis HS and the offset OST corresponds to adjusting the position where the handover is performed by virtually increasing or decreasing the cell. For example, by increasing the hysteresis HS of the serving cell, the received power of the radio signal is increased and the handover to another cell is difficult to be performed. Also, by setting the offset OST of the neighboring cell to a negative value, the received power of the radio signal from the neighboring cell appears to be small, and handover to another cell is difficult to be performed.
 また、ヒステリシスHSおよびオフセットOSTは、無線端末装置の移動速度による影響を受けにくいパラメータである。 Further, the hysteresis HS and the offset OST are parameters that are not easily influenced by the moving speed of the wireless terminal device.
 図21は、本発明の実施の形態に係る無線通信システムにおける、各位置の無線信号の受信電力の一例を示す図である。 FIG. 21 is a diagram showing an example of received power of a radio signal at each position in the radio communication system according to the embodiment of the present invention.
 図21を参照して、受信電力が極大値となる位置P1,P3,P5では、ヒステリシスHSを調整することにより、ハンドオーバ動作のタイミングを調整することが好ましい。また、受信電力が極小値となる位置P2,P4,P6では、オフセットOSTを調整することにより、ハンドオーバ動作のタイミングを調整することが好ましい。 Referring to FIG. 21, it is preferable to adjust the timing of the handover operation by adjusting the hysteresis HS at the positions P1, P3, and P5 where the received power reaches the maximum value. Further, it is preferable to adjust the timing of the handover operation by adjusting the offset OST at the positions P2, P4, and P6 at which the received power becomes the minimum value.
 一方、TTTは、ハンドオーバ動作のタイミングを時間領域で遅らせることが可能なパラメータである。TTTを調整する場合には、ハンドオーバ動作のタイミングが電波環境および地形に依存しない代わりに、ハンドオーバの行なわれる位置が無線端末装置202の移動速度によって大きく変わることになる。たとえば、TTTを大きく設定しすぎると、高速で移動する無線端末装置では、周囲の電波環境の変化が大きいため、ハンドオーバの失敗が生じやすくなる。 On the other hand, TTT is a parameter that can delay the timing of the handover operation in the time domain. When adjusting the TTT, the timing of the handover operation does not depend on the radio wave environment and the landform, but the position where the handover is performed varies greatly depending on the moving speed of the wireless terminal device 202. For example, if the TTT is set too large, a wireless terminal device that moves at high speed is likely to fail in handover because the surrounding radio wave environment changes greatly.
 図22は、本発明の実施の形態に係る無線通信システムにおいて、ハンドオーバ動作のタイミングを制御するためのパラメータの他の例を説明するための図である。 FIG. 22 is a diagram for explaining another example of parameters for controlling the timing of the handover operation in the wireless communication system according to the embodiment of the present invention.
 図22を参照して、無線端末装置202は、たとえばギャップMGの時間間隔で、無線基地局装置から送信される無線信号の受信電力を測定する。 Referring to FIG. 22, radio terminal apparatus 202 measures the received power of a radio signal transmitted from the radio base station apparatus, for example, at time intervals of gap MG.
 ギャップMGを大きくする場合には、より過去の受信電力がハンドオーバの判断に用いられることになるため、ハンドオーバ動作のタイミングが遅くなる。一方、ギャップMGを小さくする場合には、より最近の受信電力がハンドオーバの判断に用いられることになるため、ハンドオーバ動作のタイミングが早くなる。 When the gap MG is increased, the received power of the past is used for the handover determination, so the timing of the handover operation is delayed. On the other hand, when the gap MG is made smaller, the more recent received power is used for the handover decision, so the timing of the handover operation is advanced.
 ギャップMGを小さくすることにより、より最近の受信電力に基づいた適切なハンドオーバを行なうことが可能となる。一方、ギャップMGを大きくすることにより、無線端末装置202の処理負荷を低減することができる。 By reducing the gap MG, it is possible to perform an appropriate handover based on more recent received power. On the other hand, by increasing the gap MG, the processing load on the wireless terminal device 202 can be reduced.
 また、無線端末装置202は、たとえば、時刻(t-1)において測定した受信電力M(t-1)、時刻(t-1)より後の時刻tにおいて測定した受信電力M(t)およびフィルタリング係数αから、以下の式で表される受信電力MR(t)を算出する。
MR(t)=α×M(t-1)+(1-α)×M(t)
Also, the wireless terminal device 202 receives, for example, the received power M (t−1) measured at time (t−1), the received power M (t) measured at time t after time (t−1), and filtering. From the coefficient α, the received power MR (t) represented by the following equation is calculated.
MR (t) = α × M (t−1) + (1−α) × M (t)
 無線端末装置202は、受信電力MR(t)を示す測定結果通知を無線基地局装置へ送信する。 The wireless terminal device 202 transmits a measurement result notification indicating the received power MR (t) to the wireless base station device.
 フィルタリング係数αを大きくする場合には、より過去の受信電力が測定結果通知に反映されることになるため、ハンドオーバ動作のタイミングが遅くなる。一方、フィルタリング係数αを小さくする場合には、より最近の受信電力が測定結果通知に反映されることになるため、ハンドオーバ動作のタイミングが早くなる。 When the filtering coefficient α is increased, the past received power is reflected in the measurement result notification, so the timing of the handover operation is delayed. On the other hand, when the filtering coefficient α is reduced, the more recent received power is reflected in the measurement result notification, so that the timing of the handover operation is advanced.
 ここで、無線基地局装置から無線端末装置202へ送信される測定開始要求(Measurement Configuration)およびRRCコネクション再構成指示(RRC Connection Reconfiguration)には、たとえば、周辺セルごとにオフセットOSTが設定され、イベントA1~A5のうちの少なくとも1つが設定され、設定イベントに対応するヒステリシスHSおよびTTTが設定される。また、測定開始要求には、サービングセルごとにギャップMGおよびフィルタリング係数αが設定される。 Here, in the measurement start request (Measurement Configuration) and the RRC connection reconfiguration instruction (RRC Connection Reconfiguration) transmitted from the radio base station apparatus to the radio terminal apparatus 202, for example, an offset OST is set for each neighboring cell, and the event At least one of A1 to A5 is set, and hysteresis HS and TTT corresponding to the set event are set. In the measurement start request, the gap MG and the filtering coefficient α are set for each serving cell.
 [接続確立状態における無線端末装置の移動状態の検出処理]
 図23は、本発明の実施の形態に係る無線通信システムにおいて、接続確立状態の無線端末装置が移動状態の検出処理を行う際の動作手順を定めたフローチャートである。
[Detection process of moving state of wireless terminal device in connection established state]
FIG. 23 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state performs a movement state detection process in the wireless communication system according to the embodiment of the present invention.
 無線端末装置202は、たとえば無線基地局装置101へのハンドオーバ動作を行った後、ハンドオーバ動作において無線基地局装置101から受信したRRCコネクション再構成指示に含まれる移動状態パラメータ(MobilityStateParameters)に基づいて、自己の移動状態の推定処理を行うことが可能である。 For example, after performing a handover operation to the radio base station apparatus 101, the radio terminal apparatus 202, based on the mobility state parameters (MobilityStateParameters) included in the RRC connection reconfiguration instruction received from the radio base station apparatus 101 in the handover operation, It is possible to perform an estimation process of its own movement state.
 そして、無線端末装置202は、自己の移動状態の推定処理の結果に基づいて、自己の移動状態を通常移動状態(Normal-mobility State)、高速移動状態(High-mobility State)または中速移動状態(Medium-mobility State)に設定する。 Then, based on the result of the estimation process of its own movement state, the wireless terminal device 202 changes its movement state to a normal movement state (Normal-mobility State), a high-speed movement state (High-mobility State), or a medium-speed movement state. Set to (Medium-mobility State).
 図23を参照して、まず、無線端末装置202は、ハンドオーバ動作の実行回数をカウントする期間を計測するためにタイマを用いる。無線端末装置202は、タイマの計測時間を移動状態パラメータにおけるt-Evaluationに設定し、当該タイマを始動させる(ステップS202)。 Referring to FIG. 23, first, wireless terminal apparatus 202 uses a timer to measure a period for counting the number of times of execution of a handover operation. The wireless terminal device 202 sets the measurement time of the timer to t-Evaluation in the movement state parameter, and starts the timer (step S202).
 次に、無線端末装置202は、タイマを始動させてからタイマが満了するまでの間、ハンドオーバ動作の実行回数をカウントする(ステップS204)。 Next, the wireless terminal device 202 counts the number of executions of the handover operation from when the timer is started until the timer expires (step S204).
 次に、無線端末装置202は、カウントしたハンドオーバ動作の実行回数が移動状態パラメータに含まれるn-CellChangeHigh以上となる場合(ステップS206でYES)、自己の移動状態を高速移動状態に設定する(ステップS208)。 Next, when the counted number of executions of the handover operation is equal to or greater than n-CellChangeHigh included in the movement state parameter (YES in step S206), radio terminal apparatus 202 sets its own movement state to the high-speed movement state (step S208).
 一方、無線端末装置202は、カウントしたハンドオーバ動作の実行回数が上記n-CellChangeHigh未満であり(ステップS206でNO)、かつ移動状態パラメータに含まれるn-CellChangeMedium以上となる場合(ステップS210でYES)、自己の移動状態を中速移動状態に設定する(ステップS212)。 On the other hand, when the number of executions of the counted handover operation is less than the n-CellChangeHigh (NO in step S206) and the radio terminal device 202 is equal to or more than n-CellChangeMedium included in the movement state parameter (YES in step S210). The self movement state is set to the medium speed movement state (step S212).
 一方、無線端末装置202は、カウントしたハンドオーバ動作の実行回数が上記n-CellChangeMedium未満となる場合(ステップS210でNO)、タイマが満了しているか否かを確認する(ステップS214)。 On the other hand, when the counted number of executions of the handover operation is less than the n-CellChangeMedium (NO in step S210), the radio terminal apparatus 202 checks whether the timer has expired (step S214).
 無線端末装置202は、タイマが満了していない場合、すなわちタイマを始動させてからt-Evaluationに相当する時間が経過していない場合(ステップS214でNO)、引き続きハンドオーバ動作の実行回数をカウントする(ステップS204)。 If the timer has not expired, that is, if the time corresponding to t-Evaluation has not elapsed since the timer was started (NO in step S214), wireless terminal apparatus 202 continues to count the number of times the handover operation is executed. (Step S204).
 一方、無線端末装置202は、タイマが満了していた場合、すなわちタイマを始動させてからt-Evaluationに相当する時間が経過した場合(ステップS214でYES)、自己の移動状態を通常移動状態に設定する(ステップS216)。 On the other hand, when the timer has expired, that is, when the time corresponding to t-Evaluation has elapsed since the timer was started (YES in step S214), wireless terminal apparatus 202 changes its own movement state to the normal movement state. Setting is made (step S216).
 以上の動作により、無線端末装置202が、接続確立状態において、たとえばt-Evaluationにより示される所定時間内におけるハンドオーバ動作の実行回数に基づいて、自己の移動状態を推定する。 With the above operation, the wireless terminal device 202 estimates its movement state based on the number of handover operations executed within a predetermined time indicated by t-Evaluation in the connection established state.
 [アイドル状態における無線端末装置の移動状態の検出処理]
 図24は、本発明の実施の形態に係る無線通信システムにおいて、アイドル状態の無線端末装置が移動状態の検出処理を行う際の動作手順を定めたフローチャートである。
[Detection processing of moving state of wireless terminal device in idle state]
FIG. 24 is a flowchart defining an operation procedure when the idle wireless terminal apparatus performs the movement state detection process in the wireless communication system according to the embodiment of the present invention.
 無線端末装置202は、たとえば無線基地局装置101から受信したRRCコネクション再構成指示に含まれる移動状態パラメータに基づいて、自己の移動状態の推定処理を行うことが可能である。 The radio terminal apparatus 202 can perform its own movement state estimation process based on the movement state parameter included in the RRC connection reconfiguration instruction received from the wireless base station apparatus 101, for example.
 そして、無線端末装置202は、自己の移動状態の推定処理の結果に基づいて、自己の移動状態を通常移動状態(Normal-mobility State)、高速移動状態(High-mobility State)または中速移動状態(Medium-mobility State)に設定する。 Then, based on the result of the estimation process of its own movement state, the wireless terminal device 202 changes its movement state to a normal movement state (Normal-mobility State), a high-speed movement state (High-mobility State), or a medium-speed movement state. Set to (Medium-mobility State).
 図24を参照して、まず、無線端末装置202は、セル再選択動作の実行回数をカウントする期間を測定するためにタイマを用いる。無線端末装置202は、タイマの計測時間を移動状態パラメータにおけるt-Evaluationに設定し、当該タイマを始動させる(ステップS242)。 Referring to FIG. 24, first, the wireless terminal device 202 uses a timer to measure a period for counting the number of execution times of the cell reselection operation. The wireless terminal device 202 sets the measurement time of the timer to t-Evaluation in the movement state parameter, and starts the timer (step S242).
 次に、無線端末装置202は、タイマを始動させてからタイマが満了するまでの間、セル再選択動作の実行回数をカウントする(ステップS244)。 Next, the wireless terminal device 202 counts the number of execution times of the cell reselection operation from when the timer is started until the timer expires (step S244).
 次に、無線端末装置202は、カウントしたセル再選択動作の実行回数が移動状態パラメータに含まれるn-CellChangeHigh以上となる場合(ステップS246でYES)、自己の移動状態を高速移動状態に設定する(ステップS248)。 Next, when the execution count of the counted cell reselection operation is equal to or greater than n-CellChangeHigh included in the movement state parameter (YES in step S246), radio terminal apparatus 202 sets its own movement state to the high-speed movement state. (Step S248).
 一方、無線端末装置202は、カウントしたセル再選択動作の実行回数が上記n-CellChangeHigh未満であり(ステップS246でNO)、かつ移動状態パラメータに含まれるn-CellChangeMedium以上となる場合(ステップS250でYES)、自己の移動状態を中速移動状態に設定する(ステップS252)。 On the other hand, when the number of executions of the counted cell reselection operation is less than the n-CellChangeHigh (NO in step S246) and the radio terminal device 202 is equal to or greater than n-CellChangeMedium included in the movement state parameter (in step S250). YES), the self movement state is set to the medium speed movement state (step S252).
 一方、無線端末装置202は、カウントしたセル再選択動作の実行回数が上記n-CellChangeMedium未満となる場合(ステップS250でNO)、タイマが満了しているか否かを確認する(ステップS254)。 On the other hand, if the counted number of execution times of the cell reselection operation is less than the n-CellChangeMedium (NO in step S250), the wireless terminal device 202 checks whether the timer has expired (step S254).
 無線端末装置202は、タイマが満了していない場合、すなわちタイマを始動させてからt-Evaluationに相当する時間が経過していない場合(ステップS254でNO)、引き続きセル再選択動作の実行回数をカウントする(ステップS244)。 If the timer has not expired, that is, if the time corresponding to t-Evaluation has not elapsed since the timer was started (NO in step S254), wireless terminal apparatus 202 continues to execute the number of cell reselection operations. Count (step S244).
 一方、無線端末装置202は、タイマが満了していた場合、すなわちタイマを始動させてからt-Evaluationに相当する時間が経過した場合(ステップS254でYES)、自己の移動状態を通常移動状態に設定する(ステップS256)。 On the other hand, when the timer has expired, that is, when the time corresponding to t-Evaluation has elapsed since the timer was started (YES in step S254), wireless terminal apparatus 202 changes its own movement state to the normal movement state. Setting is made (step S256).
 以上の動作により、無線端末装置202は、アイドル状態において、たとえばt-Evaluationにより示される所定時間内におけるセル再選択動作の実行回数に基づいて、自己の移動状態を推定する。 With the above operation, the wireless terminal device 202 estimates its own movement state in the idle state, for example, based on the number of executions of the cell reselection operation within a predetermined time indicated by t-Evaluation.
 [検出した移動状態に応じたハンドオーバ動作のタイミング調整]
 図25は、本発明の実施の形態に係る無線通信システムにおいて、接続確立状態の無線端末装置がハンドオーバ動作のタイミング調整を行う際の動作手順を定めたフローチャートである。
[Timing adjustment of handover operation according to detected movement state]
FIG. 25 is a flowchart defining an operation procedure when a wireless terminal device in a connection establishment state adjusts timing of a handover operation in the wireless communication system according to the embodiment of the present invention.
 無線端末装置202は、接続確立状態において、推定した自己の移動状態に基づいて、ハンドオーバ動作のタイミング調整を行うことが可能である。 In the connection established state, the wireless terminal device 202 can adjust the timing of the handover operation based on the estimated own movement state.
 図25に示す動作は、たとえば無線基地局装置101によって無線端末装置202にイベントA3が設定された状態において、当該無線端末装置202がイベントA3におけるレポートオン状態へ遷移したときに起動される。 The operation illustrated in FIG. 25 is started when the wireless terminal device 202 transitions to the report on state in the event A3 in a state where the event A3 is set in the wireless terminal device 202 by the wireless base station device 101, for example.
 図25を参照して、まず、無線端末装置202は、自己の移動状態が高速移動状態である場合(ステップS282でYES)、自己が保持するTTTにスケール因子であるsf-Highを乗ずる(ステップS284)。 Referring to FIG. 25, first, when the mobile terminal device 202 is in a high-speed mobile state (YES in step S282), the wireless terminal device 202 multiplies the TTT held by itself by sf-High, which is a scale factor (step S284).
 一方、無線端末装置202は、自己の移動状態が高速移動状態でなく(ステップS282でNO)、中速移動状態である場合(ステップS286でYES)、自己が保持するTTTにスケール因子であるsf-Mediumを乗ずる(ステップS288)。 On the other hand, when the wireless terminal device 202 is not in the high-speed movement state (NO in step S282) and is in the medium-speed movement state (YES in step S286), the wireless terminal device 202 is a scaling factor in the TTT held by itself. Multiply -Medium (step S288).
 また、無線端末装置202は、自己の移動状態が中速移動状態でない場合(ステップS286でNO)、自己が保持するTTTに対して何もしない(ステップS290)。 Further, when the mobile terminal 202 is not in the medium speed mobile state (NO in step S286), the wireless terminal device 202 does nothing with respect to the TTT held by the wireless terminal device 202 (step S290).
 以上の動作により、無線端末装置202は、TTTの調整によるハンドオーバ動作のタイミング調整を行う。 Through the above operation, the wireless terminal device 202 adjusts the timing of the handover operation by adjusting the TTT.
 無線端末装置202は、レポートオン状態へ遷移した後、たとえば無線基地局装置101Bから送信される無線信号の受信電力がサービング基地局である無線基地局装置101Aから送信される無線信号の受信電力より大きい状態がTTTに相当する時間継続すると、測定した受信電力を示す測定結果通知をサービング基地局へ送信する。 After the radio terminal apparatus 202 transitions to the report-on state, for example, the reception power of the radio signal transmitted from the radio base station apparatus 101B is greater than the reception power of the radio signal transmitted from the radio base station apparatus 101A that is the serving base station. When the large state continues for a time corresponding to TTT, a measurement result notification indicating the measured received power is transmitted to the serving base station.
 また、無線端末装置202は、上記ステップS284において、自己が保持するTTTにスケール因子であるsf-Highを乗ずる。sf-Highは、たとえば0.25、0.50、0.75または1.00の値をとり、無線基地局装置101から予め通知されている。たとえば、0.25、0.50または0.75の値に設定されたsf-Highを乗じたTTTは、乗じる前のTTTより小さくなる。 Also, in step S284, the wireless terminal device 202 multiplies the TTT held by itself by sf-High, which is a scale factor. For example, sf-High has a value of 0.25, 0.50, 0.75, or 1.00, and is notified from the radio base station apparatus 101 in advance. For example, TTT multiplied by sf-High set to a value of 0.25, 0.50, or 0.75 is smaller than TTT before multiplication.
 また、無線端末装置202は、上記ステップS288において、自己が保持するTTTにスケール因子であるsf-Mediumを乗ずる。sf-Mediumは、たとえば0.25、0.50、0.75または1.00の値をとり、無線基地局装置101から予め通知されている。たとえば、0.25、0.50または0.75の値に設定されたsf-Mediumを乗じたTTTは、乗じる前のTTTより小さくなる。 In step S288, the wireless terminal device 202 multiplies the TTT held by itself by sf-Medium, which is a scale factor. For example, sf-Medium takes a value of 0.25, 0.50, 0.75, or 1.00, and is notified from the radio base station apparatus 101 in advance. For example, TTT multiplied by sf-Medium set to a value of 0.25, 0.50, or 0.75 is smaller than TTT before multiplication.
 従って、たとえば高速移動状態において0.25がTTTに乗じられ、また、中速移動状態において0.50がTTTに乗じられると、高速移動状態または中速移動状態におけるTTTは、通常移動状態におけるTTTと比べて小さくなる。このため、無線端末装置202は、高速移動状態または中速移動状態にある場合、通常移動状態にある場合と比べてより早いタイミングで測定結果通知をサービング基地局へ送信する。 Thus, for example, if TTT is multiplied by 0.25 in the high speed movement state and 0.50 is multiplied by TTT in the medium speed movement state, the TTT in the high speed movement state or the medium speed movement state is the TTT in the normal movement state. Smaller than For this reason, when the wireless terminal device 202 is in the high speed movement state or the medium speed movement state, the wireless terminal device 202 transmits the measurement result notification to the serving base station at an earlier timing than in the normal movement state.
 サービング基地局は、無線端末装置202から受信した測定結果通知に基づいて、ハンドオーバすべきか否かを判断するので、無線端末装置202は、推定した自己の移動状態に基づいてTTTを小さくすることにより、ハンドオーバ動作のタイミングを早めることが可能となる。 Since the serving base station determines whether or not to perform a handover based on the measurement result notification received from the wireless terminal device 202, the wireless terminal device 202 reduces the TTT based on the estimated movement state of itself. The timing of the handover operation can be advanced.
 [検出した移動状態に応じたセル再選択動作のタイミング調整]
 図26は、本発明の実施の形態に係る無線通信システムにおいて、アイドル状態の無線端末装置がセル再選択動作のタイミング調整を行う際の動作手順を定めたフローチャートである。
 無線端末装置202は、アイドル状態において推定した自己の移動状態に基づいて、セル再選択動作のタイミング調整を行うことが可能である。
[Timing adjustment of cell reselection operation according to detected movement status]
FIG. 26 is a flowchart defining an operation procedure when the idle radio terminal apparatus performs timing adjustment of the cell reselection operation in the radio communication system according to the embodiment of the present invention.
The wireless terminal device 202 can adjust the timing of the cell reselection operation based on its own movement state estimated in the idle state.
 より詳細には、無線端末装置202は、サービング基地局から送信される無線信号の受信電力、および他の無線基地局装置101から送信される無線信号の受信電力を比較する際に、サービング基地局から送信される無線信号の受信電力に、無線基地局装置101から通知されたQhystを加える。 More specifically, the radio terminal apparatus 202 compares the received power of the radio signal transmitted from the serving base station with the received power of the radio signal transmitted from the other radio base station apparatus 101. Qhyst notified from the radio base station apparatus 101 is added to the received power of the radio signal transmitted from the radio base station 101.
 このQhystの値が正の値である場合、無線端末装置202は、サービング基地局から送信される無線信号の受信電力を実際より大きく判断するので、他の無線基地局装置101へのセル再選択が起こりにくくなる。 When the value of Qhyst is a positive value, the radio terminal device 202 determines that the received power of the radio signal transmitted from the serving base station is larger than the actual value, so cell reselection to another radio base station device 101 is performed. Is less likely to occur.
 一方、Qhystの値が負の値である場合、無線端末装置202は、サービング基地局から送信される無線信号の受信電力を実際より小さく判断するので、他の無線基地局装置101へのセル再選択が起こりやすくなる。 On the other hand, when the value of Qhyst is a negative value, the wireless terminal device 202 determines that the received power of the wireless signal transmitted from the serving base station is smaller than the actual power, so that the cell re-transmission to other wireless base station devices 101 is performed. Selection is likely to occur.
 無線端末装置202は、このQhystの値を変化させることにより、セル再選択動作のタイミングを調整することが可能である。 The wireless terminal device 202 can adjust the timing of the cell reselection operation by changing the value of Qhyst.
 図26に示す動作は、たとえば無線端末装置202の移動状態が高速移動状態、中速移動状態、または通常移動状態のいずれかの状態へ遷移したときに起動される。 26 is activated when, for example, the movement state of the wireless terminal device 202 transitions to any of a high-speed movement state, a medium-speed movement state, and a normal movement state.
 図26を参照して、まず、無線端末装置202は、自己の移動状態が高速移動状態である場合(ステップS322でYES)、パラメータq-HystSFに含まれるスケール因子であるsf-Highを、自己が保持するQhystに加算する(ステップS324)。 Referring to FIG. 26, first, when the mobile terminal device 202 is in the high-speed mobile state (YES in step S322), wireless terminal apparatus 202 sets sf-High, which is a scale factor included in parameter q-HystSF, to self Is added to Qhyst held by (step S324).
 一方、無線端末装置202は、自己の移動状態が高速移動状態でなく(ステップS322でNO)、中速移動状態である場合(ステップS326でYES)、パラメータq-HystSFに含まれるスケール因子であるsf-Mediumを、自己が保持するQhystに加算する(ステップS328)。 On the other hand, wireless terminal apparatus 202 is a scale factor included in parameter q-HystSF when its own movement state is not a high-speed movement state (NO in step S322) and is a medium-speed movement state (YES in step S326). sf-Medium is added to Qhyst held by itself (step S328).
 また、無線端末装置202は、自己の移動状態が中速移動状態でない場合(ステップS326でNO)、自己が保持するQhystに対して何もしない(ステップS330)。 Further, when the mobile terminal 202 is not in the medium speed mobile state (NO in step S326), the wireless terminal device 202 does nothing with respect to the Qhyst held by the wireless terminal device 202 (step S330).
 以上の動作により、無線端末装置202は、Qhystの調整によるセル再選択動作のタイミング調整を行う。 With the above operation, the wireless terminal device 202 adjusts the timing of the cell reselection operation by adjusting Qhyst.
 無線端末装置202は、上記ステップS324において、無線基地局装置101から通知されたQhystにスケール因子であるsf-Highを加算する。sf-Highは、たとえば-6dB、-4dB、-2dBまたは0dBの値をとり、無線基地局装置101から予め通知されている。たとえば、-6dB、-4dBまたは-2dBの値に設定されたsf-Highを加算したQhystは、加える前のQhystより小さくなる。 In step S324, the wireless terminal device 202 adds sf-High, which is a scale factor, to Qhyst notified from the wireless base station device 101. For example, sf-High takes a value of −6 dB, −4 dB, −2 dB, or 0 dB, and is notified from the radio base station apparatus 101 in advance. For example, Qhyst obtained by adding sf-High set to a value of −6 dB, −4 dB, or −2 dB is smaller than Qhyst before addition.
また、無線端末装置202は、上記ステップS328において、無線基地局装置101から通知されたQhystにスケール因子であるsf-Mediumを加算する。sf-Mediumは、たとえば-6dB、-4dB、-2dBまたは0dBの値をとり、無線基地局装置101から予め通知されている。たとえば、-6dB、-4dBまたは-2dBの値に設定されたsf-Mediumを加算したQhystは、加える前のQhystより小さくなる。 In step S328, the wireless terminal device 202 adds sf-Medium, which is a scale factor, to Qhyst notified from the wireless base station device 101. For example, sf-Medium takes a value of −6 dB, −4 dB, −2 dB, or 0 dB, and is notified from the radio base station apparatus 101 in advance. For example, Qhyst obtained by adding sf-Medium set to a value of −6 dB, −4 dB, or −2 dB is smaller than Qhyst before addition.
 従って、たとえば高速移動状態において-6dBがQhystに加算され、また、中速移動状態において-4dBがQhystに加算されると、高速移動状態または中速移動状態におけるQhystは、通常移動状態におけるQhystと比べて小さくなる。このため、無線端末装置202は、高速移動状態または中速移動状態にある場合、通常移動状態にある場合と比べてより早いタイミングで他の無線基地局装置101へのセル再選択動作を開始することが可能となる。 Therefore, for example, when −6 dB is added to Qhyst in the high speed movement state and −4 dB is added to Qhyst in the medium speed movement state, Qhyst in the high speed movement state or the medium speed movement state becomes Qhyst in the normal movement state. Smaller than that. For this reason, when the radio terminal apparatus 202 is in the high-speed movement state or the medium-speed movement state, the cell reselection operation to the other radio base station apparatus 101 is started at an earlier timing than in the normal movement state. It becomes possible.
 [ヘテロジーニアスネットワークにおいて移動状態を検出する際に発生する問題点]
 図27は、本発明の実施の形態に係る無線通信システムにおける、無線端末装置の移動経路に基づく移動動作の実行回数の比較を示す図である。
[Problems that occur when moving state is detected in heterogeneous networks]
FIG. 27 is a diagram showing a comparison of the number of executions of the movement operation based on the movement path of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
 図27を参照して、無線基地局装置101A,101Bは、たとえばマクロ基地局であり、それぞれマクロセルMCA,MCBを形成する。また、無線基地局装置101D,101E,101Fは、たとえばピコ基地局であり、それぞれピコセルPCD,PCE,PCFを形成する。 Referring to FIG. 27, radio base station apparatuses 101A and 101B are, for example, macro base stations, and form macro cells MCA and MCB, respectively. Radio base station apparatuses 101D, 101E, and 101F are pico base stations, for example, and form pico cells PCD, PCE, and PCF, respectively.
 ピコセルPCD,PCEは、マクロセルMCAに含まれており、また、ピコセルPCFは、マクロセルMCBに含まれる。 The pico cells PCD and PCE are included in the macro cell MCA, and the pico cell PCF is included in the macro cell MCB.
 たとえば無線端末装置202Aが、地点Sから経路Pを経由して地点Eへ移動し、また、無線端末装置202Bが、地点Sから経路Qを経由して地点Eへ移動する場合を想定する。すなわち、無線端末装置202Bは、マクロセルおよびピコセルが混在するヘテロジーニアスネットワークにおいて移動する。 For example, it is assumed that the wireless terminal device 202A moves from the point S via the route P to the point E, and the wireless terminal device 202B moves from the point S via the route Q to the point E. That is, the wireless terminal device 202B moves in a heterogeneous network in which macro cells and pico cells are mixed.
 なお、経路Pおよび経路Qの曲線の長さは等しいとし、無線端末装置202Aおよび無線端末装置202Bは、同じ速度で移動するとする。 Note that it is assumed that the lengths of the curves of the route P and the route Q are equal, and the wireless terminal device 202A and the wireless terminal device 202B move at the same speed.
 無線端末装置202Aは、マクロ基地局である無線基地局装置101Aが形成するマクロセルMCAの圏内である地点Sを出発すると、地点Eに到着する前に、マクロセルMCBの圏内へ入る(ステップS352)。 When the wireless terminal device 202A departs from the point S within the macro cell MCA formed by the wireless base station device 101A, which is a macro base station, before entering the point E, the wireless terminal device 202A enters the macro cell MCB (step S352).
 次に、無線端末装置202Aは、たとえば領域AP1において1回目のハンドオーバ動作を行い、無線基地局装置101Aから無線基地局装置101Bへ接続先を変更する(ステップS354)。 Next, the wireless terminal device 202A performs a first handover operation in the area AP1, for example, and changes the connection destination from the wireless base station device 101A to the wireless base station device 101B (step S354).
 次に、無線端末装置202Aは、ハンドオーバ動作の完了後、マクロセルMCAの圏内を脱し、地点Eへ到着する(ステップS356)。 Next, after completing the handover operation, the wireless terminal device 202A leaves the area of the macro cell MCA and arrives at the point E (step S356).
 すなわち、無線端末装置202Aは、地点Sを出発してから地点Eに到着するまでに、1回だけハンドオーバ動作を行う。 That is, the wireless terminal device 202A performs a handover operation only once from the point S until it arrives at the point E.
 一方、無線端末装置202Bは、マクロ基地局である無線基地局装置101Aが形成するマクロセルMCAの圏内である地点Sを出発すると、まず、ピコ基地局である無線基地局装置101Dが形成するピコセルPCDの圏内へ進入する(ステップS358)。この際、たとえば領域AQ1においてハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Aから無線基地局装置101Dへ変更される。 On the other hand, when the wireless terminal device 202B departs from a point S that is within the macro cell MCA formed by the wireless base station device 101A that is a macro base station, first, the wireless terminal device 202D that is formed by the wireless base station device 101D that is a pico base station. (Step S358). At this time, for example, a handover operation is performed in the area AQ1, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101A to the wireless base station device 101D.
 次に、無線端末装置202BがピコセルPCDの圏内を脱するまでに、たとえば領域AQ2において2回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Dから無線基地局装置101Aへ変更される(ステップS360)。 Next, before the wireless terminal device 202B moves out of the pico cell PCD, for example, the second handover operation is performed in the area AQ2, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101D to the wireless base station device. It is changed to 101A (step S360).
 次に、無線端末装置202Bは、ピコ基地局である無線基地局装置101Eが形成するピコセルPCEの圏内へ進入する(ステップS362)。この際、たとえば領域AQ3において3回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Aから無線基地局装置101Eへ変更される。 Next, the wireless terminal device 202B enters the area of the picocell PCE formed by the wireless base station device 101E that is a pico base station (step S362). At this time, for example, the third handover operation is executed in the area AQ3, and the connection destination of the radio terminal apparatus 202B is changed from the radio base station apparatus 101A to the radio base station apparatus 101E.
 次に、無線端末装置202BがピコセルPCEの圏内を脱するまでに、たとえば領域AQ4において4回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Eから無線基地局装置101Aへ変更される(ステップS364)。 Next, before the wireless terminal device 202B moves out of the pico cell PCE, for example, the fourth handover operation is performed in the area AQ4, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101E to the wireless base station device. 101A is changed (step S364).
 次に、無線端末装置202Bは、マクロセルMCBの圏内へ進入する(ステップS366)。 Next, the wireless terminal device 202B enters the area of the macro cell MCB (step S366).
 次に、たとえば領域AQ5において5回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Aから無線基地局装置101Bへ変更される(ステップS368)。 Next, for example, the fifth handover operation is performed in the area AQ5, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101A to the wireless base station device 101B (step S368).
 次に、無線端末装置202Bは、5回目のハンドオーバ動作の完了後、マクロセルMCAの圏内を脱し、ピコ基地局である無線基地局装置101Fが形成するピコセルPCFの圏内へ進入する(ステップS370)。この際、たとえば領域AQ6において6回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Bから無線基地局装置101Fへ変更される。 Next, after completing the fifth handover operation, the wireless terminal device 202B leaves the macro cell MCA and enters the pico cell PCF formed by the wireless base station device 101F, which is a pico base station (step S370). At this time, for example, the sixth handover operation is executed in the area AQ6, and the connection destination of the radio terminal apparatus 202B is changed from the radio base station apparatus 101B to the radio base station apparatus 101F.
 次に、無線端末装置202BがピコセルPCFの圏内を脱するまでに、たとえば領域AQ7において7回目のハンドオーバ動作が実行され、無線端末装置202Bの接続先は、無線基地局装置101Fから無線基地局装置101Bへ変更される(ステップS372)。 Next, until the wireless terminal device 202B moves out of the picocell PCF, for example, the seventh handover operation is performed in the area AQ7, and the connection destination of the wireless terminal device 202B is changed from the wireless base station device 101F to the wireless base station device. 101B is changed (step S372).
 次に、無線端末装置202Aは、7回目のハンドオーバ動作の完了後、マクロセルMCBの圏内に存在する地点Eへ到着する(ステップS374)。 Next, after the completion of the seventh handover operation, the wireless terminal device 202A arrives at a point E existing within the macro cell MCB (step S374).
 ここで、経路Pおよび経路Qの曲線の長さは等しく、かつ無線端末装置202Aおよび無線端末装置202Bは、同じ速度で移動することを想定している。従って、無線端末装置202Aが地点Sから経路Pを経由して地点Eまで移動するために必要な時間、および無線端末装置202Bが地点Sから経路Qを経由して地点Eまで移動するために必要な時間は等しい。 Here, it is assumed that the lengths of the curves of the route P and the route Q are equal, and the wireless terminal device 202A and the wireless terminal device 202B move at the same speed. Accordingly, the time required for the wireless terminal device 202A to move from the point S via the route P to the point E, and the time required for the wireless terminal device 202B to move from the point S via the route Q to the point E. Time is equal.
 無線端末装置202Aは、当該時間において1回だけハンドオーバ動作を行うのに対して、無線端末装置202Bは、当該時間において7回ハンドオーバ動作を行う。従って、無線端末装置202Aは、ハンドオーバ動作の実行回数が1回だけと少ないので、たとえば図23に示すステップS216において自己の移動状態を通常移動状態に設定する。 The wireless terminal device 202A performs the handover operation only once at the time, whereas the wireless terminal device 202B performs the handover operation seven times at the time. Accordingly, the wireless terminal device 202A sets the own movement state to the normal movement state in step S216 shown in FIG.
 一方、無線端末装置202Bは、ハンドオーバ動作の実行回数が7回と多いので、図23に示すステップS206において、たとえばハンドオーバ動作の実行回数がt-Evaluationに相当する時間においてn-CellChangeHigh以上であると判断し、図23に示すステップS208において自己の移動状態を高速移動状態に設定する。 On the other hand, radio terminal apparatus 202B has a high number of times of execution of the handover operation, so in step S206 shown in FIG. 23, for example, the number of times of execution of the handover operation is n-CellChangeHigh or more at a time corresponding to t-Evaluation. In step S208 shown in FIG. 23, the self movement state is set to the high speed movement state.
 これにより、たとえば、無線端末装置202Aは、図25に示すステップS290においてTTTを変更しないが、無線端末装置202Bは、自己の移動状態が実際より速い移動状態であると誤って推定してしまい、図25に示すステップS284においてTTTに対してsf-Highを乗ずることによりTTTを短くする。このため、無線端末装置202Bのハンドオーバ動作のタイミングが早まり、無線端末装置202Bにおけるハンドオーバ動作のタイミングが適切でなくなってしまう。 Thereby, for example, the wireless terminal device 202A does not change the TTT in step S290 shown in FIG. 25, but the wireless terminal device 202B erroneously estimates that its own moving state is a moving state faster than the actual state. In step S284 shown in FIG. 25, TTT is shortened by multiplying TTT by sf-High. For this reason, the timing of the handover operation of the wireless terminal device 202B is advanced, and the timing of the handover operation in the wireless terminal device 202B becomes inappropriate.
 この結果、無線端末装置202Bは、たとえば”Too Early HO”、”HO to Wrong Cell”および”Ping Pong HO”等の不適切なハンドオーバ動作を引き起こしやすくなってしまう。 As a result, the wireless terminal device 202B is likely to cause an inappropriate handover operation such as “Too Early HO”, “HO to Wong Cell”, and “Ping Pong HO”.
 なお、上記の例では、無線端末装置202が接続確立状態のまま移動するハンドオーバ動作について想定したが、無線端末装置202がアイドル状態のまま選択先のセルを変更しながら移動するセル再選択動作についても、ハンドオーバ動作をセル再選択動作に置き換えることにより、同様に議論できる。 In the above example, the handover operation in which the wireless terminal device 202 moves in the connection established state is assumed. However, the cell reselection operation in which the wireless terminal device 202 moves while changing the selection destination cell in the idle state. Can be similarly discussed by replacing the handover operation with the cell reselection operation.
 この場合、アイドル状態において地点Sから経路Pを経由して地点Eへ到着した無線端末装置202Aは、セル再選択動作の実行回数が1回だけであるので、たとえば図24に示すステップS256において自己の移動状態を通常移動状態に設定する。 In this case, since the wireless terminal device 202A that has arrived at the point E from the point S via the route P in the idle state has only performed the cell reselection operation once, for example, the wireless terminal device 202A itself in step S256 shown in FIG. Set the movement state of to normal movement.
 一方、アイドル状態において地点Sから経路Qを経由して地点Eへ到着した無線端末装置202Bは、セル再選択動作の実行回数が7回と多いので、図24に示すステップS246において、たとえばセル再選択動作の実行回数がt-Evaluationに相当する時間においてn-CellChangeHigh以上であると判断し、図24に示すステップS248において自己の移動状態を高速移動状態に設定する。 On the other hand, since the wireless terminal device 202B that has arrived at the point E via the route Q from the point S in the idle state has a high cell reselection operation execution count of seven, in step S246 shown in FIG. It is determined that the number of executions of the selection operation is equal to or greater than n-CellChangeHigh in a time corresponding to t-Evaluation, and the own movement state is set to a high-speed movement state in step S248 shown in FIG.
 これにより、たとえば、無線端末装置202Aは、図26に示すステップS330においてQhystを変更しないが、無線端末装置202Bは、自己の移動状態が実際より速い移動状態であると誤って推定してしまい、図26に示すステップS324においてQhystに対して負の値を有するsf-Highを加算することによりQhystを小さくする。このため、無線端末装置202Bは、早すぎるタイミングでセル再選択動作を行うことにより、圏外状態になってしまう場合がある。 Thereby, for example, the wireless terminal device 202A does not change Qhyst in step S330 shown in FIG. 26, but the wireless terminal device 202B erroneously estimates that its own moving state is a moving state faster than the actual state. In step S324 shown in FIG. 26, Qhyst is reduced by adding sf-High having a negative value to Qhyst. For this reason, the wireless terminal device 202B may be out of service by performing a cell reselection operation at an early timing.
 この場合、無線端末装置202Bは、セルに在圏するために、無線基地局装置101からの無線信号の周波数を検索する等の処理を実行し直す必要があり、無線端末装置202Bの消費電力の増大およびユーザの使用感の悪化等、種々の問題が生じる。 In this case, since the wireless terminal device 202B is located in the cell, it is necessary to re-execute processing such as searching for the frequency of the wireless signal from the wireless base station device 101, and the power consumption of the wireless terminal device 202B is reduced. Various problems arise, such as an increase and deterioration of a user's feeling of use.
 従って、無線端末装置202の移動状態を正しく推定できないと、不適切なハンドオーバ動作およびセル再選択動作、すなわち不適切な移動動作が発生しやすくなるので、無線端末装置202の移動状態を正しく推定することは重要である。 Therefore, if the movement state of the wireless terminal device 202 cannot be correctly estimated, an inappropriate handover operation and cell reselection operation, that is, an inappropriate movement operation is likely to occur. Therefore, the movement state of the wireless terminal device 202 is correctly estimated. That is important.
 しかしながら、非特許文献1に記載の技術に従って無線端末装置202の移動状態の推定処理を行う場合、セルの形態およびセルのサイズを考慮せずに、所定時間当たりのハンドオーバ動作またはセルの再選択動作の実行回数のみに基づいて無線端末装置202の移動状態を推定する。 However, when performing the estimation process of the movement state of the wireless terminal device 202 according to the technique described in Non-Patent Document 1, a handover operation or a cell reselection operation per predetermined time without considering the cell form and the cell size The movement state of the wireless terminal device 202 is estimated based only on the number of executions of.
 このため、無線端末装置202Aおよび無線端末装置202Bが同じ速度で移動しているにも関わらず、上記のように移動状態の推定結果が異なってしまうという問題が発生する。 For this reason, although the wireless terminal device 202A and the wireless terminal device 202B are moving at the same speed, there arises a problem that the estimation result of the moving state is different as described above.
 本発明の実施の形態に係る無線端末装置202および無線基地局装置101では、以下の構成および動作によりヘテロジーニアスネットワークにおいても移動状態を正しく推定することにより、上記問題を解決する。 The radio terminal apparatus 202 and the radio base station apparatus 101 according to the embodiment of the present invention solve the above problem by correctly estimating the movement state even in the heterogeneous network with the following configuration and operation.
 [無線端末装置の構成]
 図28は、本発明の実施の形態に係る無線端末装置の構成を示す図である。
 図28を参照して、無線端末装置202は、アンテナ81と、サーキュレータ82と、無線受信部83と、無線送信部84と、信号処理部85と、制御部88と、入出力部89とを備える。信号処理部85は、受信信号処理部86と、送信信号処理部87とを含む。信号処理部85、制御部88、および入出力部89は、CPU(Central Processing Unit)またはDSP(Digital Signal Processor)等によって実現される。
[Configuration of wireless terminal device]
FIG. 28 is a diagram illustrating the configuration of the wireless terminal device according to the embodiment of the present invention.
Referring to FIG. 28, wireless terminal apparatus 202 includes antenna 81, circulator 82, wireless receiver 83, wireless transmitter 84, signal processor 85, controller 88, and input / output unit 89. Prepare. The signal processing unit 85 includes a reception signal processing unit 86 and a transmission signal processing unit 87. The signal processing unit 85, the control unit 88, and the input / output unit 89 are realized by a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.
 サーキュレータ82は、アンテナ81において受信されたマクロ基地局、ピコ基地局またはフェムト基地局である無線基地局装置101からの無線信号を無線受信部83へ出力し、また、無線送信部84から受けた無線信号をアンテナ81へ出力する。 The circulator 82 outputs a radio signal received from the antenna 81 from the radio base station apparatus 101 that is a macro base station, a pico base station, or a femto base station to the radio reception unit 83 and received from the radio transmission unit 84 A radio signal is output to the antenna 81.
 無線受信部83は、サーキュレータ82から受けた無線信号をベースバンド信号またはIF(Intermediate Frequency)信号に周波数変換し、この周波数変換した信号をデジタル信号に変換して受信信号処理部86へ出力する。 The radio reception unit 83 frequency-converts the radio signal received from the circulator 82 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to the reception signal processing unit 86.
 受信信号処理部86は、無線受信部83から受けたデジタル信号に対してOFDM(Orthogonal Frequency Division Multiplex)方式におけるFFT(Fast Fourier Transform)等の信号処理を行ない、この信号処理後のデジタル信号の一部または全部を所定のフレームフォーマットに変換し、制御部88へ出力する。 The received signal processing unit 86 performs signal processing such as FFT (Fast Fourier Transform) in the OFDM (Orthogonal Frequency Division Multiplex) method on the digital signal received from the wireless receiving unit 83, and one of the digital signals after the signal processing is performed. Part or all of the data is converted into a predetermined frame format and output to the control unit 88.
 送信信号処理部87は、制御部88から受けた通信データを所定のフレームフォーマットに変換した通信データ、または自ら生成した通信データに対してCDMA(Code Division Multiple Access)方式における拡散処理等の信号処理を行ない、この信号処理後のデジタル信号を無線送信部84へ出力する。 The transmission signal processing unit 87 performs signal processing such as spreading processing in the CDMA (Code Division Multiple Access) system for communication data obtained by converting the communication data received from the control unit 88 into a predetermined frame format or communication data generated by itself. The digital signal after the signal processing is output to the wireless transmission unit 84.
 無線送信部84は、送信信号処理部87から受けたデジタル信号をアナログ信号に変換し、変換したアナログ信号を無線信号に周波数変換してサーキュレータ82へ出力する。 The wireless transmission unit 84 converts the digital signal received from the transmission signal processing unit 87 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs it to the circulator 82.
 制御部88は、受信信号処理部86から受けたフレームフォーマットに格納されたデジタル信号を、たとえば音声データおよび映像データに変換し、必要であるならアナログ信号に変換したのち、スピーカ、マイク、ディスプレイおよびキー入力装置により構成される入出力部89へ出力する。 The control unit 88 converts the digital signal stored in the frame format received from the reception signal processing unit 86 into, for example, audio data and video data, and if necessary, converts it into an analog signal, and then converts it into a speaker, a microphone, a display, and The data is output to the input / output unit 89 configured by a key input device.
 また、制御部88は、たとえば音声データおよびキー入力装置において受け付けた無線端末装置202を制御するための制御信号等を入出力部89から受ける。そして、制御部88は、必要に応じて受けた音声データおよび制御信号の一部を処理し、処理した音声データおよび制御信号を他の無線端末装置202へ送信するために所定のフレームフォーマットに変換する。 Further, the control unit 88 receives from the input / output unit 89, for example, a control signal for controlling the wireless terminal device 202 received in the voice data and the key input device. Then, the control unit 88 processes a part of the received audio data and control signal as necessary, and converts the processed audio data and control signal into a predetermined frame format for transmission to another wireless terminal device 202. To do.
 また、制御部88は、無線端末装置202における各ユニットとの間で各種情報をやり取りする。 Also, the control unit 88 exchanges various information with each unit in the wireless terminal device 202.
 図29は、本発明の実施の形態に係る無線端末装置における制御部の構成を示す図である。
 図29を参照して、制御部88は、設定部11と、移動状態推定部12と、カウント部13と、タイマ14と、基地局種別判定部15と、受信電力測定部(受信電力報告部)16と、通知部(受信電力報告部)17とを含む。
FIG. 29 is a diagram illustrating a configuration of a control unit in the wireless terminal device according to the embodiment of the present invention.
Referring to FIG. 29, control unit 88 includes setting unit 11, moving state estimation unit 12, count unit 13, timer 14, base station type determination unit 15, and received power measurement unit (received power report unit). ) 16 and a notification unit (reception power report unit) 17.
 タイマ14は、計測時間を設定して始動させると、設定した計測時間が経過するまで継続して作動する。タイマ14の作動状態を確認することにより、当該タイマ14を始動してから計測時間が経過したかどうかを知ることができる。 When the timer 14 sets and starts the measurement time, the timer 14 continues to operate until the set measurement time elapses. By checking the operating state of the timer 14, it is possible to know whether or not the measurement time has elapsed since the timer 14 was started.
 カウント部13は、自己の無線端末装置202の移動動作の実行回数をカウントする。具体的には、カウント部13は、たとえば自己の無線端末装置202が接続確立状態にある場合、通信接続先の無線基地局装置101からRRCコネクション再構成指示を受信する回数を、カウント基準に従ってカウントする。カウント基準の詳細については後述する。 The counting unit 13 counts the number of executions of the moving operation of its own wireless terminal device 202. Specifically, for example, when the wireless terminal device 202 is in a connection established state, the counting unit 13 counts the number of times the RRC connection reconfiguration instruction is received from the wireless base station device 101 that is the communication connection destination according to the count criterion. To do. Details of the count reference will be described later.
 また、カウント部13は、たとえば自己の無線端末装置202がアイドル状態にある場合、端末登録処理であるアタッチ処理を実行する回数を、カウント基準に従ってカウントする。 In addition, for example, when the wireless terminal device 202 is in an idle state, the counting unit 13 counts the number of times that the attach process, which is a terminal registration process, is executed according to the count standard.
 カウント部13は、たとえば無線基地局装置101からカウント基準を取得する。具体的には、カウント基準は、たとえば無線基地局装置101により送信される報知情報または移動制御情報(MobilityControlInfo)を含むRRCコネクション再構成指示に含められる。ここで、移動制御情報を含むRRCコネクション再構成指示は、ハンドオーバコマンドとも称される。 The counting unit 13 acquires a count reference from the radio base station apparatus 101, for example. Specifically, the count reference is included in an RRC connection reconfiguration instruction including broadcast information or mobility control information (MobilityControlInfo) transmitted by the radio base station apparatus 101, for example. Here, the RRC connection reconfiguration instruction including mobility control information is also referred to as a handover command.
 カウント部13は、無線基地局装置101から受信した当該報知情報または当該ハンドオーバコマンドからカウント基準を取得する。また、カウント基準は、たとえば無線端末装置202により予め保持されていてもよい。 The counting unit 13 acquires a count reference from the broadcast information received from the radio base station apparatus 101 or the handover command. Further, the count reference may be held in advance by the wireless terminal device 202, for example.
 また、カウント部13は、実行された自己の無線端末装置202の移動動作が所定条件を満たす場合には、上記所定条件を満たす移動動作をカウントの対象から除外する。 In addition, when the movement operation of the wireless terminal device 202 that has been executed satisfies a predetermined condition, the counting unit 13 excludes the movement operation that satisfies the predetermined condition from the count target.
 たとえば、カウント部13は、無線基地局装置101から取得した情報に基づいて、上記所定条件を満たすか否かを判断する。 For example, the count unit 13 determines whether or not the predetermined condition is satisfied based on information acquired from the radio base station apparatus 101.
 具体的には、カウント部13は、たとえば報知情報を無線基地局装置101から受信し、受信した報知情報に基づいて、移動元または移動先の無線基地局装置がピコ基地局またはフェムト基地局等の小型基地局であるかどうかを判断する。 Specifically, the count unit 13 receives, for example, broadcast information from the radio base station apparatus 101, and based on the received broadcast information, the source or destination radio base station apparatus is a pico base station, a femto base station, or the like. Determine if it is a small base station.
 より詳細には、カウント部13は、受信した報知情報に含まれかつ小型基地局の情報が記載されている情報、たとえばスモールセルリスト、周辺セル情報、またはSIB9(SystemInformationBlockType9)に基づいて、移動元または移動先の無線基地局装置が小型基地局であるかどうかを判断する。 More specifically, the counting unit 13 is based on information included in the received broadcast information and in which information on a small base station is described, for example, a small cell list, neighboring cell information, or SIB9 (SystemInformationBlockType9). Alternatively, it is determined whether the destination radio base station apparatus is a small base station.
 また、カウント部13は、受信した報知情報を送信した無線基地局装置101が小型基地局であるかどうかを示す1ビットのフラグが当該報知情報において含まれる場合、上記フラグを確認することにより当該無線基地局装置101が小型基地局であるかどうかを判断してもよい。 Further, when the broadcast information includes a 1-bit flag indicating whether or not the radio base station apparatus 101 that has transmitted the received broadcast information is a small base station, the count unit 13 confirms the flag. It may be determined whether the radio base station apparatus 101 is a small base station.
 カウント部13は、移動動作完了後の、移動元または移動先の無線基地局装置101が小型基地局である場合、上記所定条件を満たすと判断する。 The counting unit 13 determines that the predetermined condition is satisfied when the source or destination radio base station apparatus 101 after completion of the movement operation is a small base station.
 また、たとえば、カウント部13は、自己の無線端末装置202の無線基地局装置101への移動動作が行われてから他の無線基地局装置101への移動動作が行われるまでの滞在時間が所定のしきい値未満の場合に、上記所定条件を満たすと判断し、上記移動動作をカウントの対象から除外する。 Further, for example, the counting unit 13 has a predetermined residence time from when the wireless terminal device 202 moves to the wireless base station device 101 until the moving operation to another wireless base station device 101 is performed. If it is less than the threshold value, it is determined that the predetermined condition is satisfied, and the moving operation is excluded from the count target.
 具体的には、カウント部13は、移動動作の完了後、上記所定のしきい値に相当する計測時間をタイマにセットする。そして、カウント部13は、次の移動動作が発生するとタイマ14が満了したか否かを確認する。 Specifically, the count unit 13 sets a measurement time corresponding to the predetermined threshold value in the timer after the movement operation is completed. Then, the count unit 13 confirms whether or not the timer 14 has expired when the next movement operation occurs.
 カウント部13は、タイマ14が満了していない場合、すなわちタイマ14を始動させてから上記所定のしきい値に相当する時間が経過していない場合、滞在時間が上記所定のしきい値に相当する値未満であると判断し、上記移動動作をカウントの対象から除外する。 When the timer 14 has not expired, that is, when the time corresponding to the predetermined threshold has not elapsed since the timer 14 was started, the counting unit 13 corresponds to the stay time corresponding to the predetermined threshold. It is determined that the value is less than the value to be counted, and the moving operation is excluded from the count target.
 また、たとえば、カウント部13は、自己の無線端末装置202の他の無線基地局装置101から小型基地局への移動動作が行われた場合に、上記所定条件を満たすと判断し、上記移動動作をカウントの対象から除外する。 In addition, for example, the counting unit 13 determines that the predetermined condition is satisfied when a moving operation from another wireless base station device 101 to the small base station is performed, and the moving operation is performed. Are excluded from the count.
 また、たとえば、カウント部13は、自己の無線端末装置202の小型基地局から他の無線基地局装置101への移動動作が行われた場合に、上記所定条件を満たすと判断し、上記移動動作をカウントの対象から除外する。 Also, for example, the counting unit 13 determines that the predetermined condition is satisfied when the mobile terminal device 202 moves from a small base station to another wireless base station device 101, and the mobile operation is performed. Are excluded from the count.
 また、たとえば、カウント部13は、自己の無線端末装置202のマクロ基地局から他の無線基地局装置101、または他の無線基地局装置101からマクロ基地局への移動動作が行われた場合に、上記所定条件を満たさないと判断し、上記移動動作をカウントの対象とする。 In addition, for example, the counting unit 13 performs a movement operation from the macro base station of its own radio terminal apparatus 202 to another radio base station apparatus 101 or from another radio base station apparatus 101 to the macro base station. Therefore, it is determined that the predetermined condition is not satisfied, and the moving operation is counted.
 基地局種別判定部15は、移動動作における移動元または移動先の無線基地局装置101から送信される無線信号の送信電力に基づいて、上記移動動作における移動元または移動先の無線基地局装置101の種別を判定する。 Based on the transmission power of the radio signal transmitted from the source or destination radio base station apparatus 101 in the movement operation, the base station type determination unit 15 moves the source or destination radio base station apparatus 101 in the movement operation. The type of is determined.
 具体的には、基地局種別判定部15は、報知情報に含まれるRRC情報(Radio Resource Control Information Elements)におけるPDSCH(Physical Downlink Shared CHannel)-Configの参照信号電力(referenceSignalPower)を取得する。 Specifically, the base station type determination unit 15 acquires the reference signal power (referenceSignalPower) of PDSCH (Physical Downlink Shared Shared CHannel) -Config in RRC information (Radio Resource Control Information Information Elements) included in the broadcast information.
 たとえば、マクロ基地局が形成するマクロセルの大きさは半径数百メートルから数十キロメートルであり、ピコ基地局またはフェムト基地局等の小型基地局が形成するセルの大きさは10~200mである。これは、マクロ基地局が送信する無線信号の送信電力、および小型基地局が送信する無線信号の送信電力の大きさが大きく異なるためである。 For example, the size of a macro cell formed by a macro base station is several hundred meters to several tens of kilometers, and the size of a cell formed by a small base station such as a pico base station or a femto base station is 10 to 200 m. This is because the transmission power of the radio signal transmitted from the macro base station and the transmission power of the radio signal transmitted from the small base station are greatly different.
 従って、基地局種別判定部15は、取得した参照信号電力に基づいて、無線基地局装置101の種別を判定することができる。基地局種別判定部15は、判定した無線基地局装置101の種別をカウント部13へ通知する。具体的な種別は、たとえば小型基地局およびマクロ基地局である。 Therefore, the base station type determination unit 15 can determine the type of the radio base station apparatus 101 based on the acquired reference signal power. The base station type determination unit 15 notifies the counting unit 13 of the determined type of the radio base station apparatus 101. Specific types are, for example, small base stations and macro base stations.
 そして、カウント部13は、たとえば基地局種別判定部15の判定結果に基づいて、上記所定条件を満たすか否かを判断する。 And the count part 13 judges whether the said predetermined conditions are satisfy | filled based on the determination result of the base station classification determination part 15, for example.
 具体的には、カウント部13は、移動動作の完了後において、基地局種別判定部15から移動元または移動先の無線基地局装置101の種別を取得する。そして、カウント部13は、取得した種別がたとえば小型基地局である場合、上記所定条件を満たすと判断し、上記移動動作をカウントの対象から除外する。 Specifically, the count unit 13 acquires the type of the wireless base station device 101 that is the movement source or the movement destination from the base station type determination unit 15 after the movement operation is completed. When the acquired type is, for example, a small base station, the counting unit 13 determines that the predetermined condition is satisfied, and excludes the moving operation from the count target.
 移動状態推定部12は、カウント部13によってカウントされた移動動作の実行回数に基づいて、自己の無線端末装置202の移動状態を推定する。 The movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions of the movement operation counted by the counting unit 13.
 具体的には、移動状態推定部12は、たとえばハンドオーバ動作において受信したRRCコネクション再構成指示に含まれる移動状態パラメータのt-Evaluationをタイマ14の計測時間に設定し、当該タイマ14を始動させる。この際、移動状態推定部12は、カウント部13により計測される移動動作の実行回数をゼロにリセットする。 Specifically, for example, the movement state estimation unit 12 sets the t-Evaluation of the movement state parameter included in the RRC connection reconfiguration instruction received in the handover operation to the measurement time of the timer 14 and starts the timer 14. At this time, the movement state estimation unit 12 resets the number of executions of the movement operation measured by the counting unit 13 to zero.
 そして、移動状態推定部12は、タイマ14を始動させてからタイマ14が満了するまで、カウント部13により計測される移動動作の実行回数を監視する。 Then, the movement state estimation unit 12 monitors the number of executions of the movement operation measured by the count unit 13 until the timer 14 expires after the timer 14 is started.
 移動状態推定部12は、上記実行回数に基づいて、自己の無線端末装置202の移動状態をたとえば高速移動状態、中速移動状態または通常移動状態のいずれかに設定する。 The movement state estimation unit 12 sets the movement state of its own wireless terminal device 202 to, for example, one of a high-speed movement state, a medium-speed movement state, and a normal movement state based on the number of executions.
 また、移動状態推定部12は、設定した自己の無線端末装置202の移動状態を、通知部17経由で無線基地局装置101へ送信する。 Also, the movement state estimation unit 12 transmits the set movement state of the wireless terminal device 202 to the wireless base station device 101 via the notification unit 17.
 設定部11は、移動状態推定部12によって推定された移動状態に基づいて、自己の無線端末装置202の移動動作の実行判断に関わる自己の無線端末装置202の設定、すなわち当該実行判断に影響する自己の無線端末装置202の設定を行う。 Based on the movement state estimated by the movement state estimation unit 12, the setting unit 11 affects the setting of the wireless terminal device 202 related to the execution determination of the movement operation of the wireless terminal device 202, that is, the execution determination. The wireless terminal device 202 is set up.
 具体的には、設定部11は、自己の無線端末装置202がアイドル状態にある場合、以下の処理を行う。すなわち、設定部11は、自己の無線端末装置202の移動状態に応じて、たとえば他の無線基地局装置101へのセル再選択動作の実行判断に影響を与えるQhystに加算するスケール因子を変更する。 Specifically, the setting unit 11 performs the following processing when the wireless terminal device 202 is in an idle state. That is, the setting unit 11 changes the scale factor to be added to Qhyst that affects the execution determination of the cell reselection operation to another radio base station apparatus 101, for example, according to the movement state of its own radio terminal apparatus 202. .
 また、設定部11は、たとえば自己の無線端末装置202が接続確立状態にある場合、移動状態推定部12によって推定された移動状態に基づいて、自己の無線端末装置202のハンドオーバ動作の実行判断に関わる自己の無線端末装置202の動作に関する設定、すなわち当該実行判断に影響する自己の無線端末装置202の動作に関する設定を行う。 For example, when the wireless terminal device 202 is in a connection established state, the setting unit 11 determines whether to execute the handover operation of the wireless terminal device 202 based on the moving state estimated by the moving state estimating unit 12. The setting related to the operation of the own wireless terminal device 202 concerned, that is, the setting related to the operation of the own wireless terminal device 202 that affects the execution determination is performed.
 すなわち、設定部11は、自己の無線端末装置202の移動状態に応じて、たとえばハンドオーバ動作のタイミングに影響を与えるTTTに乗ずるスケール因子を変更する。 That is, the setting unit 11 changes the scale factor multiplied by the TTT that affects the timing of the handover operation, for example, according to the movement state of the own wireless terminal device 202.
 そして、設定部11は、たとえば自己の無線端末装置202が保持するTTTに対して変更したスケール因子を乗ずることによりTTTの値を設定し、設定したTTTを受信電力測定部16へ出力する。 Then, the setting unit 11 sets the value of TTT by, for example, multiplying the TTT held by its own wireless terminal device 202 by the changed scale factor, and outputs the set TTT to the received power measuring unit 16.
 受信電力測定部16は、たとえば自己の無線端末装置202と接続確立状態にある無線基地局装置101であるサービング基地局から測定開始要求を受信すると、受信した測定開始要求に含まれる周辺セル情報を参照する。 For example, when the reception power measurement unit 16 receives a measurement start request from a serving base station that is a radio base station device 101 that is in a connection established state with its own wireless terminal device 202, the reception power measurement unit 16 obtains neighboring cell information included in the received measurement start request. refer.
 次に、受信電力測定部16は、周辺セル情報に基づいて、サービング基地局を含む測定対象となる無線基地局装置101の送信周波数を特定し、当該測定対象となる無線基地局装置101から送信される、当該送信周波数の無線信号の受信電力を測定する。 Next, the received power measurement unit 16 specifies the transmission frequency of the radio base station apparatus 101 to be measured including the serving base station based on the neighboring cell information, and transmits from the radio base station apparatus 101 to be the measurement target. The reception power of the radio signal having the transmission frequency is measured.
 そして、受信電力測定部16は、たとえば自己の無線端末装置202において、イベントA3がサービング基地局により設定されている場合、以下の処理を行う。 And, for example, when the event A3 is set by the serving base station in its own wireless terminal device 202, the received power measurement unit 16 performs the following processing.
 すなわち、受信電力測定部16は、サービング基地局以外の他の無線基地局装置101により送信される無線信号の受信電力が、サービング基地局により送信される無線信号の受信電力より大きくなると、自己の無線端末装置202をレポートオン状態へ遷移させる。 That is, when the received power of the radio signal transmitted by the radio base station apparatus 101 other than the serving base station becomes larger than the received power of the radio signal transmitted by the serving base station, the received power measuring unit 16 The wireless terminal device 202 is shifted to the report on state.
 この際、受信電力測定部16は、設定部11から受けたTTTをタイマ14の計測時間に設定し、当該タイマ14を始動させる。そして、受信電力測定部16は、上記他の無線基地局装置101およびサービング基地局により送信される無線信号の受信電力を監視する。 At this time, the received power measuring unit 16 sets the TTT received from the setting unit 11 as the measurement time of the timer 14 and starts the timer 14. Then, the received power measuring unit 16 monitors the received power of radio signals transmitted by the other radio base station apparatus 101 and the serving base station.
 たとえば、受信電力測定部16は、サービング基地局により送信される無線信号の受信電力において、オフセットOST1およびヒステリシスHSを設定してもよい。また、受信電力測定部16は、上記他の無線基地局装置101により送信される無線信号の受信電力において、オフセットOST2を設定してもよい。 For example, the reception power measuring unit 16 may set the offset OST1 and the hysteresis HS in the reception power of the radio signal transmitted by the serving base station. The received power measuring unit 16 may set the offset OST2 in the received power of the radio signal transmitted by the other radio base station apparatus 101.
 受信電力測定部16は、たとえば上記他の無線基地局装置101により送信される無線信号の受信電力が、サービング基地局により送信される無線信号の受信電力より大きい状態が、タイマ14を始動させてからタイマ14が満了するまで継続すると、以下の処理を行う。 The reception power measuring unit 16 starts the timer 14 when the reception power of the radio signal transmitted by the other radio base station apparatus 101 is greater than the reception power of the radio signal transmitted by the serving base station, for example. If the timer 14 continues until the timer 14 expires, the following processing is performed.
 すなわち、受信電力測定部16は、上記測定対象となる無線基地局装置101から送信される無線信号の受信電力を示す測定結果通知すなわちメジャメントレポートを通知部17へ出力する。 That is, the reception power measurement unit 16 outputs a measurement result notification, that is, a measurement report indicating the reception power of the radio signal transmitted from the radio base station apparatus 101 to be measured to the notification unit 17.
 通知部17は、受信電力測定部16からメジャメントレポートを受けると、受けたメジャメントレポートを送信信号処理部87経由でサービング基地局へ送信する。この際、通知部17は、当該メジャメントレポートに、移動状態推定部12から受けた自己の無線端末装置202の移動状態を含めてもよい。 When the notification unit 17 receives the measurement report from the reception power measurement unit 16, the notification unit 17 transmits the received measurement report to the serving base station via the transmission signal processing unit 87. At this time, the notification unit 17 may include the movement state of the own wireless terminal device 202 received from the movement state estimation unit 12 in the measurement report.
 メジャメントレポートは、サービング基地局において、メジャメントレポートを送信してきた無線端末装置202のハンドオーバを行うべきか否かについての判断に用いられる。 The measurement report is used in the serving base station to determine whether or not to perform handover of the wireless terminal device 202 that has transmitted the measurement report.
 [無線基地局装置の構成]
 図30は、本発明の実施の形態に係る無線基地局装置の構成を示す図である。
 図30を参照して、無線基地局装置(通信制御装置)101は、アンテナ91と、サーキュレータ92と、無線受信部93と、無線送信部94と、信号処理部95と、制御部98とを備える。信号処理部95は、受信信号処理部96と、送信信号処理部97とを含む。信号処理部95および制御部98は、CPU(Central Processing Unit)またはDSP(Digital Signal Processor)等によって実現される。
[Configuration of radio base station apparatus]
FIG. 30 is a diagram illustrating the configuration of the radio base station apparatus according to the embodiment of the present invention.
Referring to FIG. 30, radio base station apparatus (communication control apparatus) 101 includes an antenna 91, a circulator 92, a radio reception unit 93, a radio transmission unit 94, a signal processing unit 95, and a control unit 98. Prepare. The signal processing unit 95 includes a reception signal processing unit 96 and a transmission signal processing unit 97. The signal processing unit 95 and the control unit 98 are realized by a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).
 サーキュレータ92は、アンテナ91において受信された無線端末装置202からの無線信号を無線受信部93へ出力し、また、無線送信部94から受けた無線信号をアンテナ91へ出力する。 The circulator 92 outputs the radio signal from the radio terminal device 202 received by the antenna 91 to the radio reception unit 93 and outputs the radio signal received from the radio transmission unit 94 to the antenna 91.
 無線受信部93は、サーキュレータ92から受けた無線信号をベースバンド信号またはIF(Intermediate Frequency)信号に周波数変換し、この周波数変換した信号をデジタル信号に変換して受信信号処理部96へ出力する。 The radio reception unit 93 converts the frequency of the radio signal received from the circulator 92 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency converted signal into a digital signal, and outputs the digital signal to the reception signal processing unit 96.
 受信信号処理部96は、無線受信部93から受けたデジタル信号に対してCDMA(Code Division Multiple Access)方式における逆拡散等の信号処理を行ない、この信号処理後のデジタル信号の一部または全部を所定のフレームフォーマットに変換してコアネットワーク301側へ送信する。 The reception signal processing unit 96 performs signal processing such as despreading in a CDMA (Code Division Multiple Access) system on the digital signal received from the wireless reception unit 93, and performs part or all of the digital signal after the signal processing. The data is converted into a predetermined frame format and transmitted to the core network 301 side.
 送信信号処理部97は、コアネットワーク301側から受信した通信データを所定のフレームフォーマットに変換した通信データまたは自ら生成した通信データに対してOFDM(Orthogonal Frequency Division Multiplex)方式におけるIFFT(Inverse Fast Fourier Transform)等の信号処理を行ない、この信号処理後のデジタル信号を無線送信部94へ出力する。 The transmission signal processing unit 97 performs IFFT (Inverse Fast Fourier Transform) in an OFDM (Orthogonal Frequency Division Multiplex) method for communication data obtained by converting communication data received from the core network 301 side into a predetermined frame format or communication data generated by itself. ) And the like, and the digital signal after this signal processing is output to the wireless transmission unit 94.
 無線送信部94は、送信信号処理部97から受けたデジタル信号をアナログ信号に変換し、変換したアナログ信号を無線信号に周波数変換してサーキュレータ92へ出力する。 The wireless transmission unit 94 converts the digital signal received from the transmission signal processing unit 97 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs the converted signal to the circulator 92.
 制御部98は、無線基地局装置101における各ユニット、他の無線基地局装置101、およびコアネットワーク301との間で各種情報をやり取りする。 The control unit 98 exchanges various types of information with each unit in the radio base station apparatus 101, the other radio base station apparatus 101, and the core network 301.
 図31は、本発明の実施の形態に係る無線基地局装置における制御部の構成を示す図である。
 図31を参照して、制御部98は、基地局検出部(カウント基準作成部)21と、カウント方法リスト作成部(カウント基準作成部)22と、カウント方法リスト通知部(カウント基準通知部)23とを含む。
FIG. 31 is a diagram showing a configuration of a control unit in the radio base station apparatus according to the embodiment of the present invention.
Referring to FIG. 31, control unit 98 includes base station detection unit (count reference creation unit) 21, count method list creation unit (count reference creation unit) 22, and count method list notification unit (count reference notification unit). 23.
 図32は、本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの一例を示す図である。
 図33は、本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの他の一例を示す図である。
FIG. 32 is a diagram showing an example of a count method list in the wireless communication system according to the embodiment of the present invention.
FIG. 33 is a diagram showing another example of the count method list in the wireless communication system according to the embodiment of the present invention.
 基地局検出部21は、たとえば休止状態にある周辺基地局が始動することにより、X2インタフェースを介した当該周辺基地局との通信接続の確立を検出すると、当該周辺基地局のIDをカウント方法リスト作成部22へ出力する。 When the base station detection unit 21 detects the establishment of a communication connection with the peripheral base station via the X2 interface, for example, when the peripheral base station in a dormant state is started, the base station detection unit 21 counts the ID of the peripheral base station. Output to the creation unit 22.
 カウント方法リスト作成部22は、検出された無線基地局装置101のIDを基地局検出部21から受けると、受けたIDに基づいて、カウント基準を示すカウント方法リストを更新する。カウント基準は、具体的にはカウント方法リストに含まれる「カウント対象」または「重み付け係数」である。 When the count method list creating unit 22 receives the detected ID of the radio base station apparatus 101 from the base station detecting unit 21, the count method list creating unit 22 updates the count method list indicating the count reference based on the received ID. The count reference is specifically “count object” or “weighting coefficient” included in the count method list.
 図32を参照して、図32の(A)に示すカウント方法リスト41は、たとえば、無線基地局装置101の「ID」と、「カウント対象」との対応関係を示す。 32, the count method list 41 shown in FIG. 32A shows, for example, the correspondence between “ID” of the radio base station apparatus 101 and “count target”.
 「カウント対象」は、IDにより示される無線基地局装置101への移動動作を、移動動作の実行回数のカウント対象とすべきか否かについての基準を示す。 “Count target” indicates a criterion as to whether or not the movement operation to the radio base station apparatus 101 indicated by the ID should be counted as the number of executions of the movement operation.
 たとえば、図32の(A)に示す「ID」が1、3、10および25の無線基地局装置101は、対応する「カウント対象」が真であるので、当該無線基地局装置101への移動動作は、移動動作の実行回数のカウント対象とすべき移動動作であることを示す。 For example, the radio base station apparatus 101 with “ID” 1, 3, 10 and 25 shown in (A) of FIG. 32 has a corresponding “count object” and is moved to the radio base station apparatus 101. The operation indicates a movement operation that is to be counted for the number of executions of the movement operation.
 また、たとえば、図32の(A)に示す「ID」が32および79の無線基地局装置101は、対応する「カウント対象」が偽であるので、当該無線基地局装置101への移動動作は、移動動作の実行回数のカウント対象とすべきでない移動動作であることを示す。 Also, for example, since the corresponding “count object” is “false” for the radio base station apparatus 101 with “ID” 32 and 79 shown in FIG. 32A, the movement operation to the radio base station apparatus 101 is This indicates that the movement operation should not be counted for the number of executions of the movement operation.
 すなわち、「カウント対象」が示す真および偽は、移動動作の実行回数のカウント対象とすべきか否かについてのカウント基準を示す。 That is, “true” and “false” indicated by “count target” indicate a count reference as to whether or not the number of executions of the movement operation should be counted.
 図33を参照して、図33の(A)に示すカウント方法リスト42は、たとえば、無線基地局装置101の「ID」と、「重み付け係数」との対応関係を示す。 Referring to FIG. 33, the counting method list 42 shown in FIG. 33A shows, for example, a correspondence relationship between “ID” of the radio base station apparatus 101 and “weighting coefficient”.
 「重み付け係数」は、具体的には、無線基地局装置101毎に、当該無線基地局装置101の種別に応じて付与される係数を示す。たとえば、無線端末装置202が無線基地局装置101への移動動作を行う場合に、当該無線端末装置202が当該移動動作の実行回数をカウントする際のカウント値に対して当該係数を乗ずることにより、当該移動動作を重み付けする。 The “weighting coefficient” specifically indicates a coefficient given to each radio base station apparatus 101 according to the type of the radio base station apparatus 101. For example, when the wireless terminal device 202 performs a moving operation to the wireless base station device 101, by multiplying the count value when the wireless terminal device 202 counts the number of execution times of the moving operation by the coefficient, The moving operation is weighted.
 たとえば、図33の(A)に示すように「ID」が1、3、10および25の無線基地局装置101は、対応する「重み付け係数」が全て1.0であるので、当該無線基地局装置101への移動動作が実行されると、当該移動動作の実行回数としてカウントすべきカウント値は1となる。 For example, as shown in (A) of FIG. 33, the radio base station apparatus 101 having “ID” of 1, 3, 10 and 25 has all corresponding “weighting coefficients” of 1.0. When the movement operation to the apparatus 101 is executed, the count value to be counted as the number of execution times of the movement operation is 1.
 また、たとえば、図33の(A)に示すように「ID」が32および79の無線基地局装置101は、対応する「重み付け係数」が全て0.5であるので、当該無線基地局装置101への移動動作が実行されると、当該移動動作の実行回数としてカウントすべきカウント値は0.5となる。 Further, for example, as shown in (A) of FIG. 33, the radio base station apparatus 101 with “ID” of 32 and 79 has all corresponding “weighting coefficients” of 0.5. When the movement operation is performed, the count value to be counted as the number of executions of the movement operation is 0.5.
 すなわち、「重み付け係数」が示す値は、移動動作の実行回数としてカウントすべきカウント値のカウント基準を示す。 That is, the value indicated by the “weighting coefficient” indicates the count reference of the count value to be counted as the number of times of movement operation.
 再び図31を参照して、たとえば、カウント方法リスト作成部22は、検出された無線基地局装置101のIDを基地局検出部21から受けると、当該IDに基づいて、当該無線基地局装置101の種別を特定する。 Referring to FIG. 31 again, for example, when counting method list creation unit 22 receives the detected ID of radio base station apparatus 101 from base station detection unit 21, based on the ID, count method list creation unit 22 performs radio base station apparatus 101. Specify the type of.
 そして、カウント方法リスト作成部22は、たとえば特定した種別がマクロ基地局である場合、カウント対象として「真」を当該IDと共にカウント方法リスト41へ追加し、また、特定した種別が小型基地局である場合、カウント対象として「偽」を当該IDと共にカウント方法リスト41へ追加する。 Then, for example, when the identified type is a macro base station, the count method list creation unit 22 adds “true” as a count target to the count method list 41 together with the ID, and the identified type is a small base station. If there is, “false” is added to the count method list 41 along with the ID as a count target.
 また、カウント方法リスト作成部22は、たとえば特定した種別がマクロ基地局である場合、重み付け係数として「1.0」を当該IDと共にカウント方法リスト42へ追加し、また、特定した種別が小型基地局である場合、重み付け係数として「0.5」を当該IDと共にカウント方法リスト41へ追加してもよい。 For example, when the identified type is a macro base station, the count method list creation unit 22 adds “1.0” as a weighting coefficient to the count method list 42 together with the ID, and the identified type is a small base. In the case of a station, “0.5” may be added to the counting method list 41 together with the ID as a weighting coefficient.
 カウント方法リスト作成部22は、カウント対象または重み付け係数を追加することにより更新したカウント方法リスト41または42を、カウント方法リスト通知部23へ出力する。 The counting method list creating unit 22 outputs the counting method list 41 or 42 updated by adding the counting target or the weighting coefficient to the counting method list notifying unit 23.
 なお、カウント方法リスト作成部22は、更新すべきカウント方法リスト41または42を保持していない場合、カウント方法リストを新たに作成してもよい。また、カウント方法リスト作成部22は、たとえば他の無線基地局装置101からカウント方法リスト41または42を取得できる場合、取得したカウント方法リスト41または42をカウント方法リスト通知部23へ出力してもよい。 Note that the count method list creation unit 22 may create a new count method list when the count method list 41 or 42 to be updated is not held. In addition, for example, when the count method list 41 or 42 can be acquired from another radio base station apparatus 101, the count method list creating unit 22 may output the acquired count method list 41 or 42 to the count method list notifying unit 23. Good.
 また、カウント方法リスト作成部22は、たとえば図32の(B)に示すような、無線基地局装置101の種別と、当該無線基地局装置101のカウント対象との対応関係を示すカウント方法リスト43を作成してもよい。 In addition, the count method list creation unit 22 counts the count method list 43 indicating the correspondence between the type of the radio base station apparatus 101 and the count target of the radio base station apparatus 101, for example, as illustrated in FIG. May be created.
 また、カウント方法リスト作成部22は、たとえば図33の(B)に示すような、無線基地局装置101の種別と、当該無線基地局装置101の重み付け係数との対応関係を示すカウント方法リスト44を作成してもよい。 Further, the count method list creating unit 22, for example, as shown in FIG. 33B, a count method list 44 showing the correspondence between the type of the radio base station apparatus 101 and the weighting coefficient of the radio base station apparatus 101. May be created.
 そして、カウント方法リスト作成部22は、作成したカウント方法リスト43または44を、カウント方法リスト通知部23へ出力する。 Then, the counting method list creation unit 22 outputs the created counting method list 43 or 44 to the counting method list notification unit 23.
 カウント方法リスト通知部23は、カウント方法リスト作成部22からカウント方法リスト41、42、43または44を受けると、受けたカウント方法リスト41、42、43または44の一部または全部を、他の無線基地局装置101または無線端末装置202へ送信する。 When the count method list notifying unit 23 receives the count method list 41, 42, 43, or 44 from the count method list creating unit 22, the count method list notifying unit 23 sends part or all of the received count method list 41, 42, 43, or 44 to another Transmit to the radio base station apparatus 101 or the radio terminal apparatus 202.
 より詳細には、カウント方法リスト通知部23は、たとえば自己の無線基地局装置101がマクロ基地局または後述する管理基地局である場合、自己の無線基地局装置101が形成するセル内に位置する小型基地局、および自己の無線基地局装置101が形成するセルに隣接するセルを形成する無線基地局装置101へ、カウント方法リスト41、42、43または44を送信する。 More specifically, the counting method list notifying unit 23 is located in a cell formed by its own radio base station apparatus 101 when, for example, its own radio base station apparatus 101 is a macro base station or a management base station described later. The count method list 41, 42, 43, or 44 is transmitted to the small base station and the radio base station apparatus 101 that forms a cell adjacent to the cell formed by the own radio base station apparatus 101.
 また、カウント方法リスト通知部23は、たとえば自己の無線基地局装置101が送信する報知情報にカウント方法リスト41、42、43または44を含めることにより、自己の無線基地局装置101が形成するセルに在圏する無線端末装置202へカウント方法リスト41、42、43または44を送信信号処理部97経由で送信する。 In addition, the count method list notifying unit 23 includes, for example, the count method list 41, 42, 43, or 44 in the broadcast information transmitted by the own radio base station apparatus 101, thereby forming a cell formed by the own radio base station apparatus 101. The count method list 41, 42, 43, or 44 is transmitted via the transmission signal processing unit 97 to the wireless terminal device 202 located in
 また、カウント方法リスト通知部23は、カウント方法リスト41または42に含まれる情報を、たとえば周辺セル情報に含める。具体的には、カウント方法リスト通知部23は、カウント方法リスト41または42において、周辺セル情報に含まれるセルIDに対応するカウント対象または重み付け係数の値を特定する。 Further, the count method list notifying unit 23 includes information included in the count method list 41 or 42 in, for example, neighboring cell information. Specifically, the count method list notifying unit 23 specifies the count target or the value of the weighting coefficient corresponding to the cell ID included in the neighboring cell information in the count method list 41 or 42.
 次に、カウント方法リスト通知部23は、特定したカウント対象または重み付け係数の値を、当該セルIDに対応付けて当該周辺セル情報に含める。 Next, the count method list notifying unit 23 includes the specified count target or the value of the weighting coefficient in the neighboring cell information in association with the cell ID.
 そして、カウント方法リスト通知部23は、たとえば自己の無線基地局装置101が送信する報知情報に当該周辺セル情報を含めることにより、自己の無線基地局装置101が形成するセルに在圏する無線端末装置202へ、カウント方法リスト41または42に含まれる情報を送信信号処理部97経由で送信する。 Then, the counting method list notifying unit 23 includes, for example, the neighboring cell information in the broadcast information transmitted by the own radio base station apparatus 101, thereby allowing the radio terminal located in the cell formed by the own radio base station apparatus 101 Information included in the count method list 41 or 42 is transmitted to the device 202 via the transmission signal processing unit 97.
 また、カウント方法リスト通知部23は、自己の無線基地局装置101が当該無線基地局装置101と接続確立状態にある無線端末装置202をハンドオーバさせる際に、以下の処理を行う。 Also, the counting method list notifying unit 23 performs the following processing when the radio base station apparatus 101 hands over the radio terminal apparatus 202 that is in a connection established state with the radio base station apparatus 101.
 すなわち、カウント方法リスト通知部23は、カウント方法リスト41または42を参照することにより、当該無線端末装置202のハンドオーバ先となる無線基地局装置101のIDに対応するカウント対象または重み付け係数の値を特定する。 That is, the count method list notifying unit 23 refers to the count method list 41 or 42 to determine the count target or the weighting coefficient value corresponding to the ID of the radio base station device 101 that is the handover destination of the radio terminal device 202. Identify.
 そして、カウント方法リスト通知部23は、たとえば当該無線端末装置202へ送信信号処理部97経由で送信するハンドオーバコマンドであるRRCコネクション再構成指示に、特定したカウント対象または重み付け係数の値を含める。 Then, the count method list notifying unit 23 includes the specified count object or the value of the weighting factor in the RRC connection reconfiguration instruction that is a handover command transmitted to the wireless terminal device 202 via the transmission signal processing unit 97, for example.
 当該無線端末装置202は、当該RRCコネクション再構成指示を受信すると、受信したRRCコネクション再構成指示に含まれるカウント対象または重み付け係数の値に基づいて、当該移動動作の実行回数をカウントすることができる。 When the wireless terminal device 202 receives the RRC connection reconfiguration instruction, the wireless terminal device 202 can count the number of executions of the moving operation based on the count target or the value of the weighting coefficient included in the received RRC connection reconfiguration instruction. .
 また、カウント方法リスト通知部23は、たとえば図32の(C)に示す、無線基地局装置101のIDおよび当該無線基地局装置101の種別の対応関係を、自己の無線基地局装置101が送信する報知情報に含めて無線端末装置202へ送信してもよい。 In addition, the counting method list notifying unit 23 transmits the correspondence between the ID of the radio base station apparatus 101 and the type of the radio base station apparatus 101 shown in (C) of FIG. It may be included in the broadcast information to be transmitted to the wireless terminal device 202.
 無線端末装置202は、無線基地局装置101から受信した、図32の(B)に示すカウント方法リスト43および図32の(C)に示すIDと種別との対応関係を参照することにより、カウント対象に基づいて、移動動作の実行回数をカウントすることが可能となる。 The wireless terminal device 202 counts by referring to the counting method list 43 shown in FIG. 32B received from the wireless base station device 101 and the correspondence between the ID and type shown in FIG. Based on the object, it is possible to count the number of executions of the movement operation.
 また、無線端末装置202は、1または複数の無線基地局装置101から受信した、図33の(B)に示すカウント方法リスト44および図32の(C)に示すIDと種別との対応関係を参照することにより、重み付け係数に基づいて、移動動作の実行回数をカウントすることが可能となる。 Also, the wireless terminal device 202 shows the correspondence between the counting method list 44 shown in FIG. 33B and the ID and type shown in FIG. 32C received from one or a plurality of wireless base station devices 101. By referring, it is possible to count the number of executions of the movement operation based on the weighting coefficient.
 [カウント方法リストの更新処理およびカウント基準の通知処理]
 図34は、本発明の実施の形態に係る無線通信システムにおける、無線端末装置の移動経路の一例を示す図である。
[Counting method list update processing and count reference notification processing]
FIG. 34 is a diagram illustrating an example of a movement route of the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
 図34を参照して、無線基地局装置101A,101Bは、たとえばマクロ基地局であり、それぞれマクロセルMCA,MCBを形成する。また、無線基地局装置101D,101Eは、たとえばピコ基地局である。 Referring to FIG. 34, radio base station apparatuses 101A and 101B are macro base stations, for example, and form macro cells MCA and MCB, respectively. Radio base station apparatuses 101D and 101E are pico base stations, for example.
 ここでは、無線基地局装置101Dは、活性状態にあり、無線信号を送信することによりピコセルPCDを形成する。ピコセルPCDは、マクロセルMCAに含まれる。 Here, the radio base station apparatus 101D is in an active state, and forms a picocell PCD by transmitting a radio signal. The pico cell PCD is included in the macro cell MCA.
 一方、無線基地局装置101Eは、休止状態にあり、無線信号を送信しない。また、無線基地局装置101Eが、たとえば活性状態に遷移した場合には、ピコセルPCEを形成する。ピコセルPCEは、マクロセルMCAに含まれ、かつピコセルPCDとは重ならない。 On the other hand, the radio base station apparatus 101E is in a dormant state and does not transmit a radio signal. Further, when the radio base station apparatus 101E transitions to an active state, for example, a picocell PCE is formed. The pico cell PCE is included in the macro cell MCA and does not overlap the pico cell PCD.
 ピコセルPCDの隣接セルは、マクロセルMCAのみとなる。このため、無線基地局装置101Dが得ることが可能な、不適切なハンドオーバについての情報は、ピコセルPCDおよびマクロセルMCAに関連した不適切なハンドオーバに関する情報のみである。 The neighboring cell of the pico cell PCD is only the macro cell MCA. For this reason, the information regarding inappropriate handover that can be obtained by the radio base station apparatus 101D is only information regarding inappropriate handover related to the pico cell PCD and the macro cell MCA.
 同様に、ピコセルPCEの隣接セルは、マクロセルMCAのみとなる。このため、無線基地局装置101Eが得ることが可能な、不適切なハンドオーバについての情報は、ピコセルPCEおよびマクロセルMCAに関連した不適切なハンドオーバに関する情報のみである。 Similarly, the neighboring cell of the pico cell PCE is only the macro cell MCA. For this reason, the information regarding inappropriate handover that can be obtained by the radio base station apparatus 101E is only information regarding inappropriate handover related to the pico cell PCE and the macro cell MCA.
 一方、マクロセルMCAの隣接セルは、ピコセルPCD、ピコセルPCEおよびマクロセルMCBである。このため、無線基地局装置101Aが得ることが可能な、不適切なハンドオーバについての情報は、ピコセルPCDおよびマクロセルMCAに関連した不適切なハンドオーバ、ピコセルPCEおよびマクロセルMCAに関連した不適切なハンドオーバ、およびマクロセルMCBおよびマクロセルMCAに関連した不適切なハンドオーバに関する情報である。 On the other hand, the neighboring cells of the macro cell MCA are the pico cell PCD, the pico cell PCE, and the macro cell MCB. For this reason, the information on the improper handover that can be obtained by the radio base station apparatus 101A includes improper handover related to the picocell PCD and the macrocell MCA, improper handover related to the picocell PCE and the macrocell MCA, And information regarding inappropriate handover related to the macro cell MCB and the macro cell MCA.
 従って、マクロ基地局である無線基地局装置101Aが、少なくとも自己が形成するセル内に位置する小型基地局について管理することが好ましい。この場合における管理とは、無線基地局装置101毎にカウント基準を設定し、設定したカウント基準を含めたカウント方法リストを当該小型基地局へ通知することを意味する。 Therefore, it is preferable that the radio base station apparatus 101A, which is a macro base station, manages at least a small base station located in a cell formed by itself. Management in this case means setting a count reference for each radio base station apparatus 101 and notifying the small base station of a count method list including the set count reference.
 以下、他の無線基地局装置101を管理する無線基地局装置101を管理基地局と称する。また、当該無線基地局装置101によって管理される当該他の無線基地局装置101を被管理基地局と称する。 Hereinafter, the radio base station apparatus 101 that manages the other radio base station apparatus 101 is referred to as a management base station. The other radio base station apparatus 101 managed by the radio base station apparatus 101 is referred to as a managed base station.
 また、無線基地局装置101は、以下の基準を用いて、自己が管理基地局または被管理基地局であるべきかについて判断してもよい。すなわち、無線基地局装置101は、自己が形成するセルにおける無線基地局装置101の設置数の密度に基づいて、自己が管理基地局または被管理基地局のどちらであるかについて判断する。 Also, the radio base station apparatus 101 may determine whether it should be a management base station or a managed base station using the following criteria. That is, the radio base station apparatus 101 determines whether it is a managed base station or a managed base station based on the density of the number of installed radio base station apparatuses 101 in the cell formed by itself.
 具体的には、無線基地局装置101は、自己の送信電力に基づいて、自己が形成するセルの大きさを見積もり、また、周辺基地局の数に基づいて、当該セルに含まれる無線基地局装置101の数を見積もる。 Specifically, the radio base station apparatus 101 estimates the size of the cell formed by itself based on its own transmission power, and also includes the radio base station included in the cell based on the number of neighboring base stations. The number of devices 101 is estimated.
 これにより、無線基地局装置101は、自己が形成するセルにおける無線基地局装置101の設置数の密度を見積もることができる。 Thereby, the radio base station apparatus 101 can estimate the density of the number of installed radio base station apparatuses 101 in the cell formed by itself.
 無線基地局装置101は、たとえば自己が形成するセルにおける無線基地局装置101の設置数の密度が所定のしきい値より大きい場合、管理基地局として動作すべきと判断する。また、無線基地局装置101は、たとえば自己が形成するセルにおける無線基地局装置101の設置数の密度が所定のしきい値より小さい場合、被管理基地局として動作すべきと判断する。 The radio base station apparatus 101 determines that it should operate as a management base station, for example, when the density of the number of installed radio base station apparatuses 101 in a cell formed by itself is larger than a predetermined threshold value. For example, when the density of the number of installed wireless base station devices 101 in a cell formed by the wireless base station device 101 is smaller than a predetermined threshold value, the wireless base station device 101 determines that it should operate as a managed base station.
 たとえば、図34に示す無線通信システムにおいては、無線基地局装置101Aが管理基地局となり、無線基地局装置101Dおよび無線基地局装置101Eが無線基地局装置101Aの被管理基地局となる。また、無線基地局装置101Bは、無線基地局装置101Aの周辺基地局の一つである。 For example, in the wireless communication system shown in FIG. 34, the wireless base station device 101A is a management base station, and the wireless base station device 101D and the wireless base station device 101E are managed base stations of the wireless base station device 101A. The radio base station apparatus 101B is one of the peripheral base stations of the radio base station apparatus 101A.
 図35は、本発明の実施の形態に係る無線通信システムにおける、カウント方法リストの更新処理および無線端末装置へのカウント基準の通知処理のシーケンスの一例を示す図である。 FIG. 35 is a diagram showing an example of a sequence of count method list update processing and count reference notification processing to the wireless terminal device in the wireless communication system according to the embodiment of the present invention.
 ここでは、図34に示すように、無線端末装置202Aが、たとえばピコセルPCD内における地点Sにおいて、無線基地局装置101Dと接続確立状態にある状況を想定する。 Here, as shown in FIG. 34, a situation is assumed in which wireless terminal apparatus 202A is in a connection established state with wireless base station apparatus 101D at point S in picocell PCD, for example.
 以下、図34および図35を適宜参照しながら、無線端末装置202A、無線基地局装置101A、無線基地局装置101D、無線基地局装置101E、および無線基地局装置101Bの動作を説明する。 Hereinafter, the operations of the wireless terminal device 202A, the wireless base station device 101A, the wireless base station device 101D, the wireless base station device 101E, and the wireless base station device 101B will be described with reference to FIGS. 34 and 35 as appropriate.
 まず、無線基地局装置101Eは、たとえば休止状態から活性状態へ遷移し、無線信号の送信を開始する(ステップS752)。無線基地局装置101Eは、無線信号を送信することにより、図34に示すようにピコセルPCEを形成する。 First, for example, the radio base station apparatus 101E transitions from a dormant state to an active state and starts transmitting a radio signal (step S752). Radio base station apparatus 101E forms a picocell PCE as shown in FIG. 34 by transmitting a radio signal.
 次に、無線基地局装置101Eは、たとえば自己が形成するピコセルPCEに隣接するマクロセルMCAを形成する無線基地局装置101Aと、X2インタフェースを介した通信接続を確立する(ステップS754)。 Next, the radio base station apparatus 101E establishes a communication connection via the X2 interface, for example, with the radio base station apparatus 101A forming the macro cell MCA adjacent to the pico cell PCE formed by itself (step S754).
 次に、管理基地局である無線基地局装置101Aは、X2インタフェースを介した無線基地局装置101Eとの通信接続の確立を検出すると、以下の処理を行う。すなわち、無線基地局装置101Aは、休止状態であった被管理基地局である無線基地局装置101Eが活性状態へ遷移したことを認識し、たとえば無線基地局装置101EのIDおよび当該IDに対応するカウント基準をカウント方法リストに追加することにより、当該カウント方法リストを更新する(ステップS756)。管理基地局によるカウント方法リストの更新処理の詳細については後述する。 Next, when the wireless base station device 101A, which is a management base station, detects establishment of a communication connection with the wireless base station device 101E via the X2 interface, the wireless base station device 101A performs the following processing. That is, the radio base station apparatus 101A recognizes that the radio base station apparatus 101E, which is a managed base station that has been in the dormant state, has transitioned to the active state, and corresponds to the ID of the radio base station apparatus 101E and the ID, for example. By adding the count reference to the count method list, the count method list is updated (step S756). Details of the updating process of the count method list by the management base station will be described later.
 次に、無線基地局装置101Aは、更新したカウント方法リストを被管理基地局である無線基地局装置101Eへ送信する(ステップS758)。 Next, the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101E that is a managed base station (step S758).
 また、無線基地局装置101Aは、更新したカウント方法リストを被管理基地局である無線基地局装置101Dへ送信する(ステップS760)。 Also, the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101D that is a managed base station (step S760).
 また、無線基地局装置101Aは、更新したカウント方法リストを無線基地局装置101Bへ送信する(ステップS762)。 Also, the radio base station apparatus 101A transmits the updated count method list to the radio base station apparatus 101B (step S762).
 次に、無線基地局装置101Dは、無線基地局装置101Aから受けたカウント方法リストに基づいて、自己が形成するピコセルPCD内に在圏する無線端末装置202Aへカウント基準を送信する(ステップS764)。非管理基地局によるカウント基準の送信処理の詳細については後述する。 Next, based on the count method list received from the radio base station apparatus 101A, the radio base station apparatus 101D transmits a count reference to the radio terminal apparatus 202A located in the picocell PCD formed by itself (step S764). . Details of count-based transmission processing by the unmanaged base station will be described later.
 次に、無線端末装置202Aは、自己と接続確立状態の無線基地局装置101Dからカウント基準を受信した後、ピコセルPCD内に位置する地点SからマクロセルMCA内に位置する地点Mへ向けて移動を開始する(ステップS766)。 Next, the wireless terminal device 202A receives the count reference from the wireless base station device 101D in a connection established state with itself, and then moves from the point S located in the pico cell PCD to the point M located in the macro cell MCA. Start (step S766).
 次に、たとえば領域AD1においてハンドオーバ動作が実行され、無線端末装置202Aの接続先は、無線基地局装置101Dから無線基地局装置101Aへ変更される(ステップS768)。 Next, for example, a handover operation is performed in the area AD1, and the connection destination of the wireless terminal device 202A is changed from the wireless base station device 101D to the wireless base station device 101A (step S768).
 次に、無線端末装置202Aは、無線基地局装置101Dから受信したカウント基準に基づいて、移動動作の実行回数をカウントする(ステップS770)。 Next, the wireless terminal device 202A counts the number of executions of the movement operation based on the count reference received from the wireless base station device 101D (step S770).
 次に、無線端末装置202Aは、マクロセルMCA内に位置する地点Mへ到着すると、ピコセルPCE内に位置する地点Eへ向けて移動を開始する(ステップS772)。また、無線端末装置202Aは、マクロセルMCA内において、カウント基準を無線基地局装置101Aから受信してもよい。 Next, when the wireless terminal device 202A arrives at the point M located in the macro cell MCA, the wireless terminal device 202A starts moving toward the point E located in the pico cell PCE (step S772). Further, the radio terminal apparatus 202A may receive the count reference from the radio base station apparatus 101A in the macro cell MCA.
 次に、たとえば領域AE1においてハンドオーバ動作が実行され、無線端末装置202Aの接続先は、無線基地局装置101Aから無線基地局装置101Eへ変更される(ステップS774)。 Next, for example, a handover operation is performed in the area AE1, and the connection destination of the wireless terminal device 202A is changed from the wireless base station device 101A to the wireless base station device 101E (step S774).
 次に、無線端末装置202Aは、無線基地局装置101Dまたは無線基地局装置101Aから受信したカウント基準に基づいて、移動動作の実行回数をカウントする(ステップS776)。 Next, the wireless terminal device 202A counts the number of executions of the moving operation based on the count reference received from the wireless base station device 101D or the wireless base station device 101A (step S776).
 次に、無線端末装置202Aは、ピコセルPCE内に位置する地点Eへ到着する。以上の動作により、カウント方法リストの更新処理および無線端末装置へのカウント基準の通知処理が完了する。 Next, the wireless terminal device 202A arrives at a point E located in the picocell PCE. With the above operation, the count method list update process and the count reference notification process to the wireless terminal device are completed.
 図36は、本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置がカウント方法リストの更新処理を行う際の動作手順を定めたフローチャートである。 FIG. 36 is a flowchart defining an operation procedure when the radio base station apparatus performs a count method list update process in the radio communication system according to the embodiment of the present invention.
 以下は、図35に示す、カウント方法リストの更新処理を行う管理基地局である無線基地局装置101Aの詳細な動作であり、図35におけるステップS754からS762までの動作に対応する。 The following is a detailed operation of the radio base station apparatus 101A, which is the management base station that performs the updating process of the count method list, shown in FIG. 35, and corresponds to the operations from step S754 to S762 in FIG.
 図36を参照して、まず、無線基地局装置101Aは、たとえば無線基地局装置101が休止状態から活性状態へ遷移することにより発生する、当該無線基地局装置101とのX2インタフェースを介した通信接続の確立を監視する(ステップS802)。 Referring to FIG. 36, first, radio base station apparatus 101A communicates with radio base station apparatus 101 via the X2 interface, which is generated, for example, when radio base station apparatus 101 transitions from a dormant state to an active state. Connection establishment is monitored (step S802).
 次に、無線基地局装置101Aは、当該無線基地局装置101とのX2インタフェースを介した通信接続の確立を検出すると(ステップS802でYES)、当該無線基地局装置101が小型基地局であるか否かを判断する(ステップS804)。 Next, when the wireless base station device 101A detects establishment of a communication connection with the wireless base station device 101 via the X2 interface (YES in step S802), whether the wireless base station device 101 is a small base station or not. It is determined whether or not (step S804).
 次に、無線基地局装置101Aは、当該無線基地局装置101が小型基地局でないと判断すると(ステップS804でNO)、たとえば図33の(A)に示すように、当該無線基地局装置101のIDおよび当該IDに対応するカウント基準を示す重み付け係数である1.0を、カウント方法リスト42に追加する(ステップS806)。 Next, when the radio base station apparatus 101A determines that the radio base station apparatus 101 is not a small base station (NO in step S804), for example, as illustrated in FIG. 1.0, which is a weighting coefficient indicating the ID and the count reference corresponding to the ID, is added to the count method list 42 (step S806).
 一方、無線基地局装置101Aは、当該無線基地局装置101が小型基地局であると判断すると(ステップS804でYES)、たとえば図33の(A)に示すように、当該無線基地局装置101のIDおよび当該IDに対応するカウント基準を示す重み付け係数である0.5を、カウント方法リスト42に追加する(ステップS808)。 On the other hand, if the radio base station apparatus 101A determines that the radio base station apparatus 101 is a small base station (YES in step S804), for example, as shown in FIG. 0.5, which is a weighting coefficient indicating the ID and the count reference corresponding to the ID, is added to the count method list 42 (step S808).
 次に、無線基地局装置101Aは、たとえば周辺セル情報を参照することにより、被管理基地局を含む自己の周辺に位置する周辺基地局へ、当該カウント方法リストを送信する(ステップS810)。 Next, the wireless base station device 101A transmits the count method list to peripheral base stations located in the vicinity of the base station including the managed base station, for example, by referring to the peripheral cell information (step S810).
 なお、無線基地局装置101Aは、上記ステップS806において、当該無線基地局装置101のIDに対応する重み付け係数でなく、たとえば図32の(A)に示すように、当該IDに対応するカウント対象を示す「真」を、カウント方法リスト41に追加してもよい。 Note that, in step S806, the radio base station apparatus 101A does not select the weighting coefficient corresponding to the ID of the radio base station apparatus 101, but the count target corresponding to the ID, for example, as illustrated in FIG. “True” shown may be added to the counting method list 41.
 また、無線基地局装置101Aは、上記ステップS808において、当該無線基地局装置101のIDに対応する重み付け係数でなく、たとえば図32の(A)に示すように、当該IDに対応するカウント対象を示す「偽」を、カウント方法リスト41に追加してもよい。 In addition, in step S808, the radio base station apparatus 101A determines not the weighting coefficient corresponding to the ID of the radio base station apparatus 101, but the count target corresponding to the ID, for example, as illustrated in FIG. “False” shown may be added to the counting method list 41.
 また、管理基地局である無線基地局装置101Aは、たとえば他の無線基地局装置101が活性状態から休止状態へ遷移する際に、当該他の無線基地局装置101に関する情報をカウント方法リストから削除することにより、カウント方法リストの更新処理を行ってもよい。以下に、当該処理の詳細を示す。 Also, the wireless base station device 101A, which is a management base station, deletes information about the other wireless base station device 101 from the count method list when, for example, the other wireless base station device 101 transitions from the active state to the dormant state. By doing so, the count method list may be updated. Details of the process will be described below.
 図37は、本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置がカウント方法リストの更新処理を行う際の動作手順の他の例を定めたフローチャートである。 FIG. 37 is a flowchart defining another example of the operation procedure when the radio base station apparatus performs the count method list update process in the radio communication system according to the embodiment of the present invention.
 図37を参照して、まず、無線基地局装置101Aは、たとえば無線基地局装置101が活性状態から休止状態へ遷移することによる、当該無線基地局装置101とのX2インタフェースを介した通信接続の切断を監視する(ステップS832)。 Referring to FIG. 37, first, radio base station apparatus 101A establishes communication connection with radio base station apparatus 101 via the X2 interface, for example, when radio base station apparatus 101 transitions from an active state to a dormant state. The disconnection is monitored (step S832).
 次に、無線基地局装置101Aは、当該無線基地局装置101とのX2インタフェースを介した通信接続の切断を検出すると(ステップS832でYES)、当該無線基地局装置101のIDを特定する(ステップS834)。 Next, when the wireless base station device 101A detects disconnection of the communication connection with the wireless base station device 101 via the X2 interface (YES in step S832), the wireless base station device 101A specifies the ID of the wireless base station device 101 (step S832). S834).
 次に、無線基地局装置101Aは、たとえば図33の(A)に示すカウント方法リスト42を参照し、たとえば当該IDに対応する項目を特定し、特定した項目をカウント方法リスト42から削除する(ステップS836)。 Next, for example, the radio base station apparatus 101A refers to the counting method list 42 shown in FIG. 33A, identifies, for example, the item corresponding to the ID, and deletes the identified item from the counting method list 42 ( Step S836).
 次に、無線基地局装置101Aは、たとえば周辺セル情報を参照することにより、被管理基地局を含む自己の周辺に位置する周辺基地局へ、当該カウント方法リストを送信する(ステップS838)。 Next, the wireless base station device 101A transmits the count method list to peripheral base stations located in the vicinity of the base station including the managed base station, for example, by referring to the peripheral cell information (step S838).
 なお、無線基地局装置101Aは、上記ステップS836において、カウント方法リスト42における当該無線基地局装置101のIDに対応する項目でなく、たとえば図32の(A)に示すカウント方法リスト41における当該IDに対応する項目を、カウント方法リスト41から削除してもよい。 Note that, in step S836, the radio base station apparatus 101A is not the item corresponding to the ID of the radio base station apparatus 101 in the count method list 42, but the ID in the count method list 41 illustrated in FIG. The item corresponding to may be deleted from the counting method list 41.
 図38は、本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順を定めたフローチャートである。 FIG. 38 is a flowchart defining an operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
 以下は、図35に示す被管理基地局である無線基地局装置101Dが、無線端末装置202Aへカウント基準を通知する際の詳細な動作であり、図35におけるステップS760およびS764の動作に対応する。 The following is a detailed operation when the radio base station apparatus 101D, which is the managed base station shown in FIG. 35, notifies the radio terminal apparatus 202A of the count reference, and corresponds to the operations in steps S760 and S764 in FIG. .
 図38を参照して、まず、無線基地局装置101Dは、たとえば管理基地局である無線基地局装置101Aからカウント方法リスト41、42、43または44を受信し、受信したカウント方法リスト41、42、43または44を保持する(ステップS852)。 Referring to FIG. 38, first, radio base station apparatus 101D receives count method list 41, 42, 43, or 44 from radio base station apparatus 101A that is a management base station, for example, and receives count method list 41, 42 , 43 or 44 are held (step S852).
 次に、無線基地局装置101Dは、たとえば保持しているカウント方法リスト41、42、43または44を含めた報知情報を送信することにより、自己が形成するセルに在圏する無線端末装置202へ当該カウント方法リスト41、42、43または44を送信する(ステップS854)。 Next, the radio base station apparatus 101D transmits, for example, broadcast information including the count method list 41, 42, 43, or 44 held therein to the radio terminal apparatus 202 located in the cell formed by itself. The count method list 41, 42, 43 or 44 is transmitted (step S854).
 以上の動作により、無線端末装置202は、無線基地局装置101からカウント基準を取得することができる。 Through the above operation, the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
 無線基地局装置101Dは、上記ステップS854において、カウント方法リスト41、42、43または44を含めた報知情報を送信する。報知情報は、ブロードキャストで送信されるので、無線基地局装置101Dが形成するセルに在圏する全ての無線端末装置202は、当該カウント方法リストを受信することができる。 In step S854, the radio base station apparatus 101D transmits broadcast information including the count method list 41, 42, 43, or 44. Since the broadcast information is transmitted by broadcast, all the wireless terminal devices 202 located in the cell formed by the wireless base station device 101D can receive the count method list.
 これにより、無線基地局装置101Dは、自己が形成するセルに在圏する無線端末装置202の台数が多い場合、カウント方法リスト41、42、43または44に含まれるカウント基準を、当該無線端末装置202に対して効率よく通知することができる。 As a result, when the number of wireless terminal devices 202 existing in the cell formed by the wireless base station device 101D is large, the wireless base station device 101D uses the counting reference included in the counting method list 41, 42, 43, or 44 as the wireless terminal device. 202 can be notified efficiently.
 なお、被管理基地局である無線基地局装置101Dでなく、たとえば管理基地局である無線基地局装置101Aが、カウント方法リスト41、42、43または44を含む報知情報を無線端末装置202へ送信してもよい。 Note that, for example, the radio base station device 101A, which is a managed base station, transmits notifying information including the count method list 41, 42, 43, or 44 to the radio terminal device 202, not the radio base station device 101D that is a managed base station. May be.
 図39は、本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順の他の例を定めたフローチャートである。 FIG. 39 is a flowchart defining another example of the operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
 以下は、図35に示す被管理基地局である無線基地局装置101Dが、無線端末装置202Aへカウント基準を通知する際の詳細な動作であり、図35におけるステップS760およびS764の動作に対応する。 The following is a detailed operation when the radio base station apparatus 101D, which is the managed base station shown in FIG. 35, notifies the radio terminal apparatus 202A of the count reference, and corresponds to the operations in steps S760 and S764 in FIG. .
 図39を参照して、まず、無線基地局装置101Dは、たとえば管理基地局である無線基地局装置101Aからカウント方法リスト41、42、43または44を受信し、受信したカウント方法リスト41、42、43または44を保持する(ステップS872)。 Referring to FIG. 39, first, radio base station apparatus 101D receives count method list 41, 42, 43, or 44 from radio base station apparatus 101A that is a management base station, for example, and receives count method list 41, 42 received. , 43 or 44 are held (step S872).
 次に、無線基地局装置101Dは、周辺セル情報を参照し、当該周辺セル情報に含まれるセルIDを取得する(ステップS874)。 Next, the radio base station apparatus 101D refers to the neighboring cell information and acquires a cell ID included in the neighboring cell information (step S874).
 次に、無線基地局装置101Dは、保持しているカウント方法リスト41、42、43または44を参照し、取得したセルIDに対応するカウント基準を特定する(ステップS876)。 Next, the radio base station apparatus 101D refers to the held count method list 41, 42, 43, or 44, and specifies the count reference corresponding to the acquired cell ID (step S876).
 次に、無線基地局装置101Dは、特定したカウント基準を、当該セルIDに対応付けて当該周辺セル情報に含める(ステップS878)。 Next, the radio base station apparatus 101D includes the specified count reference in the neighboring cell information in association with the cell ID (step S878).
 次に、無線基地局装置101Dは、たとえば当該周辺セル情報を含めた報知情報を送信することにより、自己が形成するセルに在圏する無線端末装置202へ当該周辺セル情報を送信する(ステップS880)。 Next, the wireless base station device 101D transmits the neighboring cell information to the wireless terminal device 202 located in the cell formed by the wireless base station device 101D, for example, by transmitting broadcast information including the neighboring cell information (step S880). ).
 以上の動作により、無線端末装置202は、無線基地局装置101からカウント基準を取得することができる。 Through the above operation, the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
 無線基地局装置101Dは、上記ステップS880において、カウント基準を含む周辺セル情報を含めた報知情報を送信する。報知情報は、ブロードキャストで送信されるので、無線基地局装置101Dが形成するセルに在圏する全ての無線端末装置202は、当該周辺セル情報を受信することができる。 In step S880, the radio base station apparatus 101D transmits broadcast information including neighboring cell information including the count reference. Since the broadcast information is transmitted by broadcast, all the wireless terminal devices 202 existing in the cell formed by the wireless base station device 101D can receive the neighboring cell information.
 これにより、無線基地局装置101Dは、自己が形成するセルに在圏する無線端末装置202の台数が多い場合、周辺セル情報に含まれるカウント基準を、当該無線端末装置202に対して効率よく通知することができる。 Thereby, the radio base station apparatus 101D efficiently notifies the radio terminal apparatus 202 of the count reference included in the neighboring cell information when the number of radio terminal apparatuses 202 located in the cell formed by the radio base station apparatus 101D is large. can do.
 なお、被管理基地局である無線基地局装置101Dでなく、たとえば管理基地局である無線基地局装置101Aが、カウント基準を含む周辺セル情報を報知情報に含めることにより、無線端末装置202へカウント基準を送信してもよい。 In addition, the radio base station apparatus 101A, which is a managed base station, for example, the radio base station apparatus 101A, which is a managed base station, counts the radio terminal apparatus 202 by including neighboring cell information including a count reference in the broadcast information. A reference may be sent.
 図40は、本発明の実施の形態に係る無線通信システムにおいて、無線基地局装置が無線端末装置へカウント基準を通知する際の動作手順の他の例を定めたフローチャートである。 FIG. 40 is a flowchart defining another example of the operation procedure when the radio base station apparatus notifies the radio terminal apparatus of the count reference in the radio communication system according to the embodiment of the present invention.
 以下は、図35に示す無線基地局装置101Dが、無線端末装置202Aへカウント基準を通知する際の詳細な動作であり、図35におけるステップS760およびS768の動作に対応する。 The following is the detailed operation when the radio base station apparatus 101D shown in FIG. 35 notifies the radio terminal apparatus 202A of the count reference, and corresponds to the operations in steps S760 and S768 in FIG.
 図40を参照して、まず、無線基地局装置101Dは、たとえば管理基地局である無線基地局装置101Aからカウント方法リスト41、42、43または44を受信し、受信したカウント方法リスト41、42、43または44を保持する(ステップS902)。 Referring to FIG. 40, first, radio base station apparatus 101D receives count method list 41, 42, 43 or 44 from radio base station apparatus 101A which is a management base station, for example, and receives count method list 41, 42 received. , 43 or 44 are held (step S902).
 次に、無線基地局装置101Dは、自己と接続確立状態にある無線端末装置202が測定した受信電力の測定結果を示す測定結果通知を、当該無線端末装置202から受信する(ステップS904)。 Next, the radio base station apparatus 101D receives from the radio terminal apparatus 202 a measurement result notification indicating the measurement result of the received power measured by the radio terminal apparatus 202 in a connection established state with itself (step S904).
 次に、無線基地局装置101Dは、無線端末装置202Aから受信した測定結果通知に基づいて、当該無線端末装置202Aのハンドオーバを行なうべきか否かを判断する(ステップS906)。 Next, based on the measurement result notification received from the wireless terminal device 202A, the wireless base station device 101D determines whether or not the wireless terminal device 202A should be handed over (step S906).
 次に、無線基地局装置101Dは、無線端末装置202Aのハンドオーバを行なうべきでないと判断すると(ステップS906でNO)、無線端末装置202から引き続き測定結果通知を受信する(ステップS904)。 Next, when the radio base station apparatus 101D determines that the radio terminal apparatus 202A should not be handed over (NO in step S906), the radio base station apparatus 101D continues to receive a measurement result notification from the radio terminal apparatus 202 (step S904).
 一方、無線基地局装置101Dは、無線端末装置202Aのハンドオーバを行なうべきであると判断すると(ステップS906でYES)、周辺セル情報を参照してたとえば無線基地局装置101Aをハンドオーバ先として決定し、以下の処理を行う。 On the other hand, if the radio base station apparatus 101D determines that the handover of the radio terminal apparatus 202A should be performed (YES in step S906), for example, the radio base station apparatus 101A is determined as a handover destination with reference to neighboring cell information, The following processing is performed.
 すなわち、無線基地局装置101Dは、保持しているカウント方法リスト41、42、43または44を参照し、ハンドオーバ先の無線基地局装置101AのIDに対応するカウント基準を特定する(ステップS908)。 That is, the radio base station apparatus 101D refers to the count method list 41, 42, 43, or 44 that is held, and specifies the count reference corresponding to the ID of the handover destination radio base station apparatus 101A (step S908).
 次に、無線基地局装置101Dは、無線基地局装置101Aを示すハンドオーバ要求を、基地局間インタフェースであるX2インタフェース経由で無線基地局装置101Aへ送信する(ステップS910)。 Next, the radio base station apparatus 101D transmits a handover request indicating the radio base station apparatus 101A to the radio base station apparatus 101A via the X2 interface which is an inter-base station interface (step S910).
 次に、無線基地局装置101Dは、当該ハンドオーバ要求の応答であるハンドオーバ応答を、無線基地局装置101Aから受信するまで待機する(ステップS912でNO)。 Next, the radio base station apparatus 101D stands by until a handover response, which is a response to the handover request, is received from the radio base station apparatus 101A (NO in step S912).
 次に、無線基地局装置101Dは、無線基地局装置101Aからハンドオーバ応答を受信すると(ステップS912でYES)、特定したカウント基準を含めたハンドオーバコマンドであるRRCコネクション再構成指示を、無線端末装置202Aへ送信する(ステップS914)。 Next, when the radio base station apparatus 101D receives a handover response from the radio base station apparatus 101A (YES in step S912), the radio base station apparatus 101D sends an RRC connection reconfiguration instruction that is a handover command including the specified count reference to the radio terminal apparatus 202A. (Step S914).
 以上の動作により、無線端末装置202は、無線基地局装置101からカウント基準を取得することができる。 Through the above operation, the wireless terminal device 202 can acquire the count reference from the wireless base station device 101.
 無線基地局装置101Dがカウント方法リスト41、42、43または44、または周辺セル情報等を含む報知情報を送信する場合、送信する報知情報の情報量が大きくなってしまう。このため、無線基地局装置101Dにおける報知情報の送信処理、および無線基地局装置101Dが形成するセルに在圏する無線端末装置202における報知情報の受信処理の負担が重くなってしまうので、当該セルに在圏する無線端末装置202の台数が少ない場合において好ましくない。 When the radio base station apparatus 101D transmits broadcast information including the count method list 41, 42, 43 or 44, or neighboring cell information, the amount of broadcast information to be transmitted becomes large. For this reason, the burden of the broadcast information transmission process in the radio base station apparatus 101D and the broadcast information reception process in the radio terminal apparatus 202 located in the cell formed by the radio base station apparatus 101D becomes heavy. This is not preferable when the number of wireless terminal devices 202 located in the area is small.
 一方、無線基地局装置101Dは、上記ステップS914において、カウント基準を含むハンドオーバコマンドを、ハンドオーバの対象となる無線端末装置202へ送信する。 On the other hand, in step S914, the radio base station apparatus 101D transmits a handover command including a count reference to the radio terminal apparatus 202 that is a handover target.
 これにより、無線基地局装置101Dは、自己が形成するセルに在圏する無線端末装置202の台数が少ない場合、すなわちハンドオーバ動作の発生回数が少ない場合に、無線端末装置202に対してカウント基準を効率よく通知することができる。 Thereby, the radio base station apparatus 101D sets the count reference for the radio terminal apparatus 202 when the number of radio terminal apparatuses 202 existing in the cell formed by the radio base station apparatus D is small, that is, when the number of occurrences of the handover operation is small. Notification can be made efficiently.
 [移動動作の完了後に行う移動状態の更新動作]
 図41は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置がセル再選択動作の完了後に行う移動状態の更新動作の一例を示すシーケンス図である。
[Move state update operation performed after move operation]
FIG. 41 is a sequence diagram showing an example of a moving state update operation performed by the wireless terminal device after completion of the cell reselection operation in the wireless communication system according to the embodiment of the present invention.
 図2に示すように、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aを通信相手として選択してから、セルCAおよびセルCBの重複領域へ移動した場合を想定する。 As shown in FIG. 2, it is assumed that the wireless terminal device 202 is located in the cell CA, moves to the overlapping area of the cell CA and the cell CB after selecting the wireless base station device 101A as a communication partner.
 図41に示すように、まず、無線端末装置202は、無線基地局装置101Aを新たに通信相手として選択することを決定すると、無線基地局装置101Aから送信される報知情報を受信し(ステップS401)、受信した報知情報の内容を保存する(ステップS402)。この報知情報に、周辺セル情報、およびセル再選択を行なうための情報が含まれる。 As shown in FIG. 41, first, when the radio terminal apparatus 202 determines to newly select the radio base station apparatus 101A as a communication partner, the radio terminal apparatus 202 receives broadcast information transmitted from the radio base station apparatus 101A (step S401). ), The content of the received notification information is stored (step S402). This broadcast information includes neighboring cell information and information for performing cell reselection.
 以降の動作(ステップS403~S412)は、図3に示すシーケンス図における動作(ステップS3~S12)と同様であるため、ここでは詳細な説明は繰り返さない。 Since the subsequent operations (steps S403 to S412) are the same as the operations (steps S3 to S12) in the sequence diagram shown in FIG. 3, detailed description thereof will not be repeated here.
 次に、無線端末装置202は、無線基地局装置101Aまたは無線基地局装置101Bから受信した報知情報に含まれるSIB(System Information Block)に基づいて、以下に示す動作手順に従って自己の移動状態を更新する(ステップS413)。 Next, wireless terminal apparatus 202 updates its movement state according to the following operation procedure based on SIB (System Information Block) included in the broadcast information received from wireless base station apparatus 101A or wireless base station apparatus 101B. (Step S413).
 以上の動作により、無線端末装置202は、セル再選択動作の完了後に移動状態を更新する。 By the above operation, the wireless terminal device 202 updates the movement state after completion of the cell reselection operation.
 また、無線端末装置202は、ハンドオーバ動作の完了後においても、同様に移動状態の更新動作を行う。
 図42は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置がハンドオーバ動作の完了後に行う移動状態の更新動作の一例を示すシーケンス図である。
In addition, the wireless terminal device 202 performs the movement state update operation in the same manner even after the handover operation is completed.
FIG. 42 is a sequence diagram illustrating an example of a movement state update operation performed by the wireless terminal device after completion of the handover operation in the wireless communication system according to the embodiment of the present invention.
 図2を参照して、無線端末装置202が、セルCA内に位置し、無線基地局装置101Aと通信中である状態から、セルCAおよびセルCBの重複領域へ移動した場合を想定する。また、無線端末装置202は、無線基地局装置101Aから報知情報を取得している。 Referring to FIG. 2, it is assumed that wireless terminal apparatus 202 moves from the state where it is located in cell CA and communicating with wireless base station apparatus 101A to the overlapping area of cell CA and cell CB. In addition, the wireless terminal device 202 acquires broadcast information from the wireless base station device 101A.
 再び図42を参照して、まず、無線基地局装置101Aは、自己と通信中の無線端末装置202の測定対象となる周波数と、当該周波数の無線信号を送信する他の無線基地局装置とを設定する(ステップS431)。 Referring to FIG. 42 again, first, radio base station apparatus 101A determines a frequency to be measured by radio terminal apparatus 202 that is communicating with itself, and another radio base station apparatus that transmits a radio signal of the frequency. It sets (step S431).
 次に、無線基地局装置101Aは、設定した他の無線基地局装置から送信される無線信号の受信レベルを無線端末装置202に測定させるための測定開始要求を無線端末装置202へ送信する。この測定開始要求には、周辺セル情報、すなわち測定対象となる無線基地局装置のセルIDが含まれる。また、この測定開始要求には、各無線基地局装置の送信周波数が含まれる(ステップS432)。 Next, the wireless base station device 101A transmits to the wireless terminal device 202 a measurement start request for causing the wireless terminal device 202 to measure the reception level of the wireless signal transmitted from the other wireless base station device that has been set. This measurement start request includes neighboring cell information, that is, the cell ID of the radio base station apparatus to be measured. Further, the measurement start request includes the transmission frequency of each radio base station device (step S432).
 以降の動作(ステップS433~S447)は、図4に示すシーケンス図における動作(ステップS33~S47)と同様であるため、ここでは詳細な説明は繰り返さない。 Since the subsequent operations (steps S433 to S447) are the same as the operations (steps S33 to S47) in the sequence diagram shown in FIG. 4, detailed description thereof will not be repeated here.
 次に、無線端末装置202は、無線基地局装置101Bから報知情報を取得する(ステップS448)。 Next, the wireless terminal device 202 acquires broadcast information from the wireless base station device 101B (step S448).
 次に、無線端末装置202は、無線基地局装置101Aまたは無線基地局装置101Bから受信した報知情報に含まれるSIBに基づいて、以下に示す動作手順に従って自己の移動状態を更新する(ステップS449)。 Next, based on the SIB included in the broadcast information received from the radio base station apparatus 101A or the radio base station apparatus 101B, the radio terminal apparatus 202 updates its movement state according to the following operation procedure (step S449). .
 以上の動作により、無線端末装置202は、ハンドオーバ動作の完了後に移動状態を更新する。 With the above operation, the wireless terminal device 202 updates the movement state after the handover operation is completed.
 無線端末装置202は、図41に示すステップS413および図42に示すステップS449において移動状態の更新動作を行う。すなわち、無線端末装置202は、移動動作の完了後において、移動状態の更新動作を行う。 The wireless terminal device 202 performs the movement state update operation in step S413 shown in FIG. 41 and step S449 shown in FIG. That is, the wireless terminal device 202 performs the movement state update operation after the movement operation is completed.
 [推定した移動状態に基づく無線端末装置の設定動作]
 図43は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動状態の検出処理および当該移動状態に応じた設定処理を行う際の動作手順を定めたフローチャートである。
[Setting operation of wireless terminal device based on estimated movement state]
FIG. 43 is a flowchart defining an operation procedure when the wireless terminal device performs a movement state detection process and a setting process according to the movement state in the wireless communication system according to the embodiment of the present invention.
 図43を参照して、無線端末装置202は、たとえばハンドオーバ動作またはセル再選択動作等の移動動作が完了した状態にあり、当該移動動作後の通信接続先の無線基地局装置101であるサービング基地局により、イベントA3が設定されている場合を想定する(ステップS472)。 Referring to FIG. 43, radio terminal apparatus 202 is in a state in which a mobile operation such as a handover operation or a cell reselection operation is completed, and serving base station 101 that is a radio base station apparatus 101 that is a communication connection destination after the mobile operation. Assume that the event A3 is set by the station (step S472).
 次に、無線端末装置202は、カウント基準に従って、当該移動動作の実行回数を示すカウント値CNTをカウントする(ステップS474)。 Next, the wireless terminal device 202 counts a count value CNT indicating the number of times of execution of the moving operation according to the count standard (step S474).
 次に、無線端末装置202は、カウント値CNTに基づいて、自己の移動状態を推定する(ステップS476)。 Next, the wireless terminal device 202 estimates its movement state based on the count value CNT (step S476).
 次に、無線端末装置202は、たとえば自己が保持するTTTに対して、推定した自己の移動状態に応じたスケール因子を乗ずることにより、TTTの値を調整する(ステップS478)。 Next, the wireless terminal device 202 adjusts the value of TTT by multiplying, for example, the TTT held by itself by a scale factor corresponding to the estimated movement state of itself (step S478).
 次に、無線端末装置202は、周辺セル情報に基づいて、サービング基地局を含む無線基地局装置101から送信される無線信号の受信電力を測定する(ステップS480)。 Next, the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the radio base station apparatus 101 including the serving base station based on the neighboring cell information (step S480).
 次に、無線端末装置202は、サービング基地局以外の他の無線基地局装置101により送信される無線信号の受信電力T1がサービング基地局により送信される無線信号の受信電力S1より大きくなると(ステップS482でYES)、以下の処理を行う。 Next, when the radio signal reception power T1 transmitted by the radio base station apparatus 101 other than the serving base station becomes larger than the radio signal reception power S1 transmitted by the serving base station, the radio terminal apparatus 202 (step S1). The following processing is performed.
 すなわち、無線端末装置202は、レポートオン状態へ遷移し、計測時間をTTTに設定したタイマを始動させる(ステップS484)。 That is, the wireless terminal device 202 transitions to the report-on state, and starts a timer whose measurement time is set to TTT (step S484).
 一方、無線端末装置202は、受信電力T1が受信電力S1より小さい場合(ステップS482でNO)、無線基地局装置101から送信される無線信号の受信電力を継続して測定する(ステップS480)。 On the other hand, when the received power T1 is smaller than the received power S1 (NO in step S482), the radio terminal apparatus 202 continuously measures the received power of the radio signal transmitted from the radio base station apparatus 101 (step S480).
 次に、無線端末装置202は、受信電力T1が受信電力S1より大きい状態(ステップS486でYES)が、TTTに相当する時間経過するまで(ステップS488でNO)受信電力を監視し、TTTに相当する時間経過すると(ステップS488でYES)、以下の処理を行う。 Next, wireless terminal apparatus 202 monitors the received power until the time corresponding to TTT elapses (NO in step S488) when the received power T1 is greater than received power S1 (YES in step S486), and corresponds to TTT. When the elapsed time has elapsed (YES in step S488), the following processing is performed.
 すなわち、無線端末装置202は、無線基地局装置101から送信される無線信号の受信電力を示す測定結果通知であるメジャメントレポートをサービング基地局へ送信する(ステップS490)。 That is, the wireless terminal device 202 transmits a measurement report, which is a measurement result notification indicating the received power of the wireless signal transmitted from the wireless base station device 101, to the serving base station (step S490).
 一方、無線端末装置202は、受信電力T1が受信電力S1より大きい状態がTTTに相当する時間継続しない場合(ステップS486でNO)、レポートオフ状態へ遷移し、無線基地局装置101から送信される無線信号の受信電力を継続して測定する(ステップS480)。 On the other hand, when the state in which received power T1 is greater than received power S1 does not continue for a time corresponding to TTT (NO in step S486), radio terminal apparatus 202 transitions to a report off state and is transmitted from radio base station apparatus 101. The reception power of the radio signal is continuously measured (step S480).
 以上の動作により、無線端末装置202は、移動動作の完了後に推定した自己の移動状態に基づいて、TTTの設定を行う。 With the above operation, the wireless terminal device 202 sets the TTT based on its own movement state estimated after completion of the movement operation.
 無線端末装置202は、上記ステップS474において、無線基地局装置101から取得したカウント基準を用いてもよいし、自己が保持する所定のカウント基準を用いてもよい。また、上記ステップS474における、移動動作の実行回数のカウント処理の詳細については後述する。 The wireless terminal apparatus 202 may use the count reference acquired from the wireless base station apparatus 101 in step S474, or may use a predetermined count reference held by itself. Details of the count process of the number of executions of the movement operation in step S474 will be described later.
 また、無線端末装置202は、上記ステップS476において、たとえばt-Evaluationに相当する時間における移動動作の実行回数を評価し、評価した結果に応じて自己の移動状態を通常移動状態、中速移動状態または高速移動状態に設定する。 In step S476, the wireless terminal device 202 evaluates the number of executions of the moving operation in a time corresponding to, for example, t-Evaluation, and changes its own moving state to the normal moving state or the medium speed moving state according to the evaluation result. Or set to high-speed movement.
 また、無線端末装置202は、上記ステップS478において、TTTの値の設定を行ったが、設定した自己の移動状態に応じて、たとえばアイドル状態におけるセル再選択動作を行う際において、判断基準となる受信電力に影響を与えるQhystに加算する定数の変更処理を行ってもよい。 In addition, the wireless terminal apparatus 202 sets the TTT value in step S478. However, the wireless terminal apparatus 202 becomes a determination criterion when performing a cell reselection operation in an idle state, for example, according to the set movement state. You may perform the change process of the constant added to Qhyst which affects reception power.
 これにより、無線端末装置202は、自己の移動状態に応じて、セル再選択動作の起こりやすさの調整を行うことができる。 Thereby, the wireless terminal device 202 can adjust the likelihood of the cell reselection operation depending on the movement state of itself.
 なお、無線端末装置202は、上記ステップS478において、自己の移動状態に応じて以下のような設定の変更を行うことにより、接続確立状態におけるハンドオーバ動作のタイミング、またはアイドル状態におけるセル再選択の起こりやすさの調整を行ってもよい。 In step S478, the wireless terminal device 202 changes the following settings according to its movement state, thereby causing the timing of the handover operation in the connection establishment state or the occurrence of cell reselection in the idle state. The ease may be adjusted.
 すなわち、無線端末装置202に設定される、たとえばTTT、ヒステリシスHS、オフセットOST、ギャップMGおよびフィルタリング係数αといったパラメータについて、各設定値の変更、各パラメータに乗ずる係数の変更、または各パラメータの組み合わせの変更等が行われてもよい。また、無線端末装置202に設定されるイベントの変更が行われてもよい。上記変更は、無線基地局装置101により行われてもよいし、当該無線端末装置202により行われてもよい。 That is, for parameters such as TTT, hysteresis HS, offset OST, gap MG, and filtering coefficient α set in the wireless terminal device 202, change of each set value, change of coefficient multiplied by each parameter, or combination of parameters Changes and the like may be made. In addition, an event set in the wireless terminal device 202 may be changed. The change may be performed by the radio base station apparatus 101 or the radio terminal apparatus 202.
 また、無線端末装置202は、上記ステップS476において、自己の移動状態を段階的に示す値により推定したが、自己の移動速度自体を推定してもよい。たとえば、移動している無線端末装置202が無線基地局装置101により送信される無線信号を受信する際に発生するドップラー効果による周波数のシフト、またはGPS(Global Positioning System)と地図情報との組み合わせ等を用いることにより、無線端末装置202の移動速度を推定することができる。 In addition, in step S476, the wireless terminal device 202 estimates the moving state of the wireless terminal device 202 step by step, but may estimate the moving speed itself. For example, a frequency shift due to the Doppler effect generated when the moving wireless terminal device 202 receives a wireless signal transmitted by the wireless base station device 101, or a combination of GPS (Global Positioning System) and map information, etc. By using, the moving speed of the wireless terminal device 202 can be estimated.
 また、無線端末装置202は、上記ステップS490において、サービング基地局へ送信する測定結果通知であるメジャメントレポートに、自己が推定した移動状態を含めてもよい。 In addition, in step S490, the wireless terminal device 202 may include the movement state estimated by itself in the measurement report that is the measurement result notification transmitted to the serving base station.
 これにより、サービング基地局は、当該無線端末装置202から受信した移動状態に基づいて、後述する電力変化量を取得することができる。 Thereby, the serving base station can acquire a power change amount, which will be described later, based on the movement state received from the wireless terminal device 202.
 [推定した移動状態の無線基地局装置への通知動作]
 図44は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動状態の検出処理および当該移動状態の無線基地局装置への通知処理を行う際の動作手順を定めたフローチャートである。
[Notification operation to wireless base station apparatus of estimated movement state]
FIG. 44 is a flowchart that defines an operation procedure when the wireless terminal device performs a movement state detection process and a notification process to the wireless base station apparatus of the movement state in the wireless communication system according to the embodiment of the present invention. is there.
 図44を参照して、無線端末装置202が、たとえばハンドオーバ動作またはセル再選択動作等の移動動作が完了した状態にある場合を想定する(ステップS492)。 Referring to FIG. 44, it is assumed that radio terminal apparatus 202 is in a state where a movement operation such as a handover operation or a cell reselection operation is completed (step S492).
 ステップS494~S496の動作は、図43に示すフローチャートにおける動作(ステップS474~S476)と同様であるため、ここでは詳細な説明は繰り返さない。 Since operations in steps S494 to S496 are the same as those in the flowchart shown in FIG. 43 (steps S474 to S476), detailed description will not be repeated here.
 次に、無線端末装置202は、推定した自己の移動状態を、無線基地局装置101へ通知する(ステップS498)。 Next, the wireless terminal device 202 notifies the wireless base station device 101 of the estimated movement state of itself (step S498).
 以上の動作により、無線端末装置202は、移動動作の完了後に推定した自己の移動状態を、無線基地局装置101へ通知する。 Through the above operation, the wireless terminal device 202 notifies the wireless base station device 101 of its own movement state estimated after the completion of the movement operation.
 無線端末装置202は、上記ステップS494において、無線基地局装置101から取得したカウント基準を用いてもよいし、自己が保持する所定のカウント基準を用いてもよい。また、上記ステップS494における、移動動作の実行回数のカウント処理の詳細については後述する。 The wireless terminal device 202 may use the count reference acquired from the wireless base station device 101 in step S494, or may use a predetermined count reference held by itself. Details of the count process of the number of executions of the movement operation in step S494 will be described later.
 無線端末装置202は、上記ステップS498において、たとえば自己と接続確立状態のサービング基地局へ送信する測定結果通知に、推定した自己の移動状態を含めることにより、当該移動状態をサービング基地局へ通知する。 In step S498, the wireless terminal apparatus 202 notifies the serving base station of the movement state by including the estimated movement state of the self in the measurement result notification transmitted to the serving base station in the connection established state with itself, for example. .
 サービング基地局は、当該無線端末装置202から移動状態を受信することにより、当該無線端末装置202の移動速度を推定する。これにより、サービング基地局は、当該移動速度に基づいて、自己の無線基地局装置の形成するセルに在圏する無線端末装置202における無線信号の受信電力の、無線端末装置202の位置変化に対する変化度合い(以下、電力変化量とも称する。)を取得することができる。 The serving base station estimates the moving speed of the wireless terminal device 202 by receiving the moving state from the wireless terminal device 202. Thereby, the serving base station changes the received power of the radio signal in the radio terminal device 202 located in the cell formed by its own radio base station device with respect to the position change of the radio terminal device 202 based on the moving speed. The degree (hereinafter, also referred to as power change amount) can be acquired.
 サービング基地局は、無線端末装置202の電力変化量が大きい場合には、ハンドオーバ動作のタイミングが早まるように制御し、無線端末装置202の電力変化量が小さい場合には、ハンドオーバ動作のタイミングが遅くなるように制御する。 The serving base station performs control so that the timing of the handover operation is advanced when the power change amount of the wireless terminal device 202 is large, and the timing of the handover operation is delayed when the power change amount of the wireless terminal device 202 is small. Control to be.
 これにより、サービング基地局は、ハンドオーバ動作のタイミングを適正化することができるので、不適切なハンドオーバ動作の発生を抑制することができる。 Thereby, since the serving base station can optimize the timing of the handover operation, the occurrence of an inappropriate handover operation can be suppressed.
 [移動動作の実行回数のカウント処理]
 無線端末装置202が、ヘテロジーニアスネットワークにおける自己の移動状態を適切に判断するためには、セルの形態およびセルのサイズを考慮した上で、所定時間当たりの移動動作の実行回数をカウントする必要がある。
[Counting the number of executions of moving operations]
In order for the wireless terminal device 202 to appropriately determine its own movement state in the heterogeneous network, it is necessary to count the number of executions of the movement operation per predetermined time in consideration of the cell form and the cell size. is there.
 このため、無線端末装置202は、カウント基準に従って、移動動作の実行回数をカウントする。無線端末装置202が行う上記カウント処理について、以下に説明する。 For this reason, the wireless terminal apparatus 202 counts the number of executions of the movement operation according to the count standard. The count process performed by the wireless terminal device 202 will be described below.
 [無線基地局装置から取得する情報に基づく場合]
 図45は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順を定めたフローチャートである。
[When based on information acquired from a wireless base station]
FIG. 45 is a flowchart defining an operation procedure when the wireless terminal device counts the number of executions of the moving operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図45を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、移動元の無線基地局装置101、または移動先の無線基地局装置101から報知情報を取得する(ステップS514)。 Referring to FIG. 45, radio terminal apparatus 202 broadcasts from the movement-source radio base station apparatus 101 or the movement-destination radio base station apparatus 101 after the movement operation such as the handover operation or the cell reselection operation is completed. Information is acquired (step S514).
 次に、無線端末装置202は、たとえば当該報知情報に基づいて、移動元の無線基地局装置101が小型基地局であると判断する場合(ステップS516でYES)、カウント基準に従って当該移動動作をカウントの対象とせず、移動動作の実行回数を示すカウント値CNTをインクリメントしない(ステップS518)。 Next, when the wireless terminal device 202 determines that the movement-source wireless base station device 101 is a small base station based on the broadcast information, for example (YES in step S516), the wireless terminal device 202 counts the moving operation according to the count criterion. The count value CNT indicating the number of executions of the movement operation is not incremented (step S518).
 一方、無線端末装置202は、当該報知情報に基づいて、移動元の無線基地局装置101が小型基地局でないと判断した場合(ステップS516でNO)、以下の処理を行う。 On the other hand, when the wireless terminal device 202 determines that the source wireless base station device 101 is not a small base station based on the broadcast information (NO in step S516), the wireless terminal device 202 performs the following processing.
 すなわち、無線端末装置202は、当該報知情報に基づいて、移動先の無線基地局装置101が小型基地局であると判断する場合(ステップS520でYES)、カウント基準に従って当該移動動作をカウントの対象とせず、カウント値CNTをインクリメントしない(ステップS518)。 That is, when the radio terminal apparatus 202 determines that the movement-destination radio base station apparatus 101 is a small base station based on the broadcast information (YES in step S520), the radio terminal apparatus 202 counts the movement operation according to the count criterion. The count value CNT is not incremented (step S518).
 一方、無線端末装置202は、当該報知情報に基づいて、移動先の無線基地局装置101が小型基地局でないと判断した場合(ステップS520でNO)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS522)。 On the other hand, if the wireless terminal device 202 determines that the movement-destination wireless base station device 101 is not a small base station based on the notification information (NO in step S520), the wireless terminal device 202 counts the movement operation according to the counting criterion. Then, the count value CNT is incremented (step S522).
 以上の動作により、無線端末装置202は、報知情報およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断する。 With the above operation, the wireless terminal device 202 determines whether or not the moving operation is to be counted as the number of executions of the moving operation based on the notification information and the count reference.
 なお、無線端末装置202は、上記ステップS514において、移動動作の完了後に取得した報知情報に基づいて、移動元または移動先の無線基地局装置が小型基地局であるかどうかの判断を行ったが、上記移動動作前に既に取得していた情報を用いて上記判断を行ってもよい。 In step S514, the wireless terminal device 202 determines whether the source or destination wireless base station device is a small base station based on the notification information acquired after the completion of the moving operation. The above determination may be made using information already acquired before the moving operation.
 また、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この場合、当該無線端末装置202は、上記ステップS522において、カウント値CNTに1.0を加算し、また、上記ステップS518において、カウント値CNTに0.5を加算する。 Further, the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. In this case, the wireless terminal device 202 adds 1.0 to the count value CNT in step S522, and adds 0.5 to the count value CNT in step S518.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 また、無線端末装置202は、上記ステップS516およびS520において、以下の情報により、移動元または移動先の無線基地局装置が小型基地局であるかどうかを判断してもよい。 Also, in steps S516 and S520, the wireless terminal device 202 may determine whether the source or destination wireless base station device is a small base station from the following information.
 すなわち、無線端末装置202は、たとえば小型基地局のセルIDが記載されているスモールセルリストを報知情報から取得する。 That is, the wireless terminal device 202 acquires from the broadcast information, for example, a small cell list in which a cell ID of a small base station is described.
 これにより、無線端末装置202は、取得したスモールセルリストに基づいて、移動元または移動先の無線基地局装置が小型基地局であるかどうかを判断することができる。 Thereby, the wireless terminal device 202 can determine whether or not the source or destination wireless base station device is a small base station based on the acquired small cell list.
 また、無線端末装置202は、たとえば小型基地局のセルIDが記載されている周辺セル情報を報知情報から取得する。 Further, the wireless terminal device 202 acquires, for example, the neighboring cell information in which the cell ID of the small base station is described from the broadcast information.
 これにより、無線端末装置202は、取得した周辺セル情報に基づいて、移動元または移動先の無線基地局装置が小型基地局であるかどうかを判断することができる。 Thereby, the wireless terminal device 202 can determine whether or not the source or destination wireless base station device is a small base station based on the acquired neighboring cell information.
 しかしながら、スモールセルリストまたは周辺セル情報に含めるべき小型基地局のセルIDは数十個に及ぶので、小型基地局のセルIDを含むスモールセルリストまたは周辺セル情報の情報量が大きくなってしまう。 However, since there are several tens of cell IDs of small base stations to be included in the small cell list or neighboring cell information, the information amount of the small cell list or neighboring cell information including the cell ID of the small base station becomes large.
 このため、小型基地局のセルIDを含むスモールセルリストまたは周辺セル情報を報知情報に含めると、報知情報の送信処理および受信処理の負担が重くなるので好ましくない。このため、無線基地局装置101が送信する報知情報において、たとえば当該無線基地局装置101が小型基地局であるかどうかを示す1ビットのフラグを含めてもよい。 For this reason, including the small cell list including the cell ID of the small base station or the neighboring cell information in the broadcast information is not preferable because the burden of the transmission processing and reception processing of the broadcast information increases. For this reason, in the broadcast information transmitted by the radio base station apparatus 101, for example, a 1-bit flag indicating whether or not the radio base station apparatus 101 is a small base station may be included.
 このように、無線端末装置202は、サービング基地局から取得した報知情報の上記1ビットのフラグを参照することにより、サービング基地局が小型基地局であるかどうかを判断することができる。 Thus, the wireless terminal device 202 can determine whether or not the serving base station is a small base station by referring to the 1-bit flag of the broadcast information acquired from the serving base station.
 また、無線端末装置202は、ターゲット基地局が小型基地局であるか否かについては、移動動作後のサービング基地局から取得した報知情報の上記1ビットのフラグを参照することにより、上記ターゲット基地局が小型基地局であるかどうかを判断することができる。 In addition, the radio terminal device 202 determines whether the target base station is a small base station by referring to the 1-bit flag of the broadcast information acquired from the serving base station after the moving operation. It can be determined whether the station is a small base station.
 これにより、無線通信システムにおいて、報知情報を送受信する際の処理負担の増加を抑えることができる。 Thereby, it is possible to suppress an increase in processing burden when transmitting / receiving broadcast information in a wireless communication system.
 また、無線端末装置202は、SIB1(SystemInformationBlockType1)における、スケジューリング情報を参照し、小型基地局名であるhnb-Name(home eNB Name)を含むSIB9(SystemInformationBlockType9)を報知情報から取得できる場合、以下の処理を行ってもよい。 In addition, when the wireless terminal device 202 can acquire SIB9 (SystemInformationBlockType9) including hnb-Name (home eNB Name), which is a small base station name, from broadcast information by referring to scheduling information in SIB1 (SystemInformationBlockType1), Processing may be performed.
 すなわち、無線端末装置202は、SIB9から取得したhnb-Nameと、移動元または移動先の無線基地局装置101の名前とを照合することにより、移動元または移動先の無線基地局装置101が小型基地局であるかどうかを判断することができる。 That is, the wireless terminal device 202 compares the hnb-Name acquired from the SIB 9 with the name of the source or destination wireless base station device 101, so that the source or destination wireless base station device 101 is small. It can be determined whether it is a base station.
 また、上記ステップS516またはS520において、無線端末装置202は、移動動作の完了後において、移動元または移動先の無線基地局装置101が小型基地局であると判断する場合(ステップS516でYESまたはステップS520でYES)、カウント基準に従って当該移動動作をカウントの対象から除外する(ステップS518)。 In step S516 or S520, when the wireless terminal device 202 determines that the source or destination wireless base station device 101 is a small base station after completion of the moving operation (YES in step S516 or step S516). In S520, YES), the movement operation is excluded from the count target according to the count criterion (Step S518).
 これにより、無線端末装置202は、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 Thereby, the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
 [セルに在圏する滞在時間に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作後に在圏するセルにおける滞在時間およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。
[Based on the time spent in the cell]
Further, after completion of the moving operation, the wireless terminal device 202 determines whether or not the moving operation is to be counted for the number of executions of the moving operation based on the staying time in the cell located after the moving operation and the count reference. May be.
 図46は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 46 is a flowchart that defines another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図46を参照して、まず、無線端末装置202は、たとえばハンドオーバ動作またはセル再選択動作等の移動動作が完了した際に、計測時間を所定のしきい値に設定してタイマを始動し、ハンドオーバ動作またはセル再選択動作等の移動動作の発生まで待機する(ステップS552でNO)。 Referring to FIG. 46, first, when a mobile operation such as a handover operation or a cell reselection operation is completed, for example, radio terminal apparatus 202 sets a measurement time to a predetermined threshold value and starts a timer. It waits until the occurrence of a movement operation such as a handover operation or a cell reselection operation (NO in step S552).
 次に、無線端末装置202は、移動動作が発生した場合(ステップS552でYES)、タイマが満了しているかどうかを確認する(ステップS554)。 Next, when a moving operation occurs (YES in step S552), the wireless terminal device 202 checks whether the timer has expired (step S554).
 次に、無線端末装置202は、タイマが満了していない場合、すなわちタイマを始動してから所定のしきい値に相当する時間が経過していない場合(ステップS554でNO)、カウント基準に従って当該移動動作をカウントの対象とせず、カウント値CNTをインクリメントしない(ステップS556)。 Next, when the timer has not expired, that is, when the time corresponding to the predetermined threshold has not elapsed since the timer was started (NO in step S554), the wireless terminal device 202 The moving operation is not counted and the count value CNT is not incremented (step S556).
 一方、無線端末装置202は、タイマが満了している場合、すなわちタイマを始動してから所定のしきい値に相当する時間が経過した場合(ステップS554でYES)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS558)。 On the other hand, when the timer has expired, that is, when a time corresponding to a predetermined threshold has elapsed since the timer was started (YES in step S554), the wireless terminal device 202 performs the moving operation according to the count criterion. The count value CNT is incremented as a count target (step S558).
 次に、無線端末装置202は、計測時間を所定のしきい値に設定してタイマをリセットする(ステップS560)。 Next, the wireless terminal device 202 sets the measurement time to a predetermined threshold value and resets the timer (step S560).
 以上の動作により、無線端末装置202は、移動動作の完了後に在圏するセルにおける滞在時間およびカウント基準に基づいて、当該移動動作をカウントの対象とするか否かについて判断する。 With the above operation, the wireless terminal device 202 determines whether or not the moving operation is to be counted based on the staying time and the count reference in the cell that is in the area after the moving operation is completed.
 なお、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この際、当該無線端末装置202は、上記ステップS558において、カウント値CNTに1.0を加算し、また、上記ステップS556において、カウント値CNTに0.5を加算する。 Note that the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting criterion in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S558, and adds 0.5 to the count value CNT in step S556.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 また、無線端末装置202は、移動動作が発生した際に(ステップS552でYES)、上記ステップS554においてタイマが満了しているか否かに基づいて、当該移動動作より前に在圏したセルの滞在時間が、所定のしきい値に相当する時間より長いか短いかについて判断する。 Also, when a mobile operation occurs (YES in step S552), the wireless terminal device 202 stays in a cell that has been in the area before the mobile operation based on whether or not the timer has expired in step S554. It is determined whether the time is longer or shorter than the time corresponding to the predetermined threshold value.
 また、小型基地局が形成するセルの大きさは、マクロ基地局が形成するセルの大きさより小さいので、たとえば無線端末装置202が当該セルを横断するために必要な時間は、マクロ基地局が形成する大きなセルを横断するために必要な時間と比べて短くなる。 In addition, since the size of the cell formed by the small base station is smaller than the size of the cell formed by the macro base station, for example, the time required for the wireless terminal device 202 to cross the cell is formed by the macro base station. Compared to the time required to cross a large cell.
 これにより、無線端末装置202は、上記ステップS552において移動動作が発生した際にタイマが満了していない場合(ステップS554でNO)、当該移動動作より前に在圏したセルが小型基地局により形成されたセルである可能性が高いと判断する。 As a result, if the timer has not expired when the moving operation occurs in step S552 (NO in step S554), the wireless terminal device 202 forms a cell located before the moving operation by the small base station. It is determined that there is a high possibility that the cell has been deleted.
 また、無線端末装置202は、移動元の無線基地局装置101が小型基地局である可能性が高いと判断した場合、上記ステップS556において当該移動動作をカウントの対象としないので、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 If the wireless terminal device 202 determines that the source wireless base station device 101 is likely to be a small base station, the wireless terminal device 202 does not count the moving operation in step S556. Can be prevented from being erroneously estimated to be a faster moving state than actual.
 [移動先の無線基地局装置の種別に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作後に在圏するセルを形成する無線基地局装置101の種別およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。
[When based on the type of destination base station]
In addition, after completion of the moving operation, the wireless terminal device 202 counts the moving operation based on the type of the wireless base station device 101 that forms a cell that is in the area after the moving operation and the count reference. You may judge whether it makes object.
 図47は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 47 is a flowchart defining another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図47を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、移動動作後に在圏するセルを形成する無線基地局装置101が小型基地局である場合(ステップS594でYES)、以下の処理を行う。すなわち、無線端末装置202は、カウント基準に従って当該移動動作をカウントの対象とせず、移動動作の実行回数を示すカウント値CNTをインクリメントしない(ステップS596)。 Referring to FIG. 47, radio terminal apparatus 202 is a small base station in which radio base station apparatus 101 that forms a cell that is in the area after the move operation after the move operation such as the handover operation or the cell reselection operation is completed. If there is (YES in step S594), the following processing is performed. That is, the wireless terminal device 202 does not count the movement operation according to the count criterion, and does not increment the count value CNT indicating the number of executions of the movement operation (step S596).
 一方、無線端末装置202は、移動動作後に在圏するセルを形成する無線基地局装置101が小型基地局でない場合(ステップS594でNO)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS598)。 On the other hand, if the wireless base station device 101 that forms a cell that is in the area after the moving operation is not a small base station (NO in step S594), the wireless terminal device 202 counts the moving operation according to the count criterion. CNT is incremented (step S598).
 以上の動作により、無線端末装置202は、移動動作の完了後に在圏するセルを形成する無線基地局装置101の種別およびカウント基準に基づいて、上記移動動作を移動動作の実行回数のカウント対象とするかどうかを判断する。 With the above operation, the wireless terminal device 202 sets the moving operation as a target for counting the number of executions of the moving operation based on the type and the counting reference of the wireless base station device 101 that forms a cell that is located after the moving operation is completed. Determine whether to do.
 上記ステップS594において、無線端末装置202は、移動動作の完了後に在圏するセルを形成する無線基地局装置101が小型基地局であると判断する場合(ステップS594でYES)、カウント基準に従って上記移動動作をカウントの対象から除外する(ステップS596)。 In step S594, when the radio terminal apparatus 202 determines that the radio base station apparatus 101 that forms a cell that is in the service area after completion of the movement operation is a small base station (YES in step S594), the radio terminal apparatus 202 performs the movement according to the count criterion. The operation is excluded from the count target (step S596).
 これにより、無線端末装置202は、小型基地局が形成するセルへの移動動作をカウントの対象としないことにより、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 As a result, the wireless terminal device 202 incorrectly estimates that its own moving state is a faster moving state than the actual moving state by not counting the moving operation to the cell formed by the small base station. Can be prevented.
 なお、移動先の無線基地局装置101の種別は、移動元または移動先の無線基地局装置101から取得してもよいし、上記無線基地局装置101以外の他の無線基地局装置から取得してもよい。また、無線端末装置202が、予め移動先の無線基地局装置101の種別を保持しておいてもよい。 The type of the movement-destination radio base station apparatus 101 may be acquired from the movement-source or movement-destination radio base station apparatus 101, or may be acquired from a radio base station apparatus other than the radio base station apparatus 101. May be. Further, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement destination in advance.
 また、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この際、当該無線端末装置202は、上記ステップS598において、カウント値CNTに1.0を加算し、また、上記ステップS596において、カウント値CNTに0.5を加算する。 Further, the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S598, and adds 0.5 to the count value CNT in step S596.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 [移動元の無線基地局装置の種別に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作前に在圏したセルを形成する無線基地局装置101の種別およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。
[Based on the type of source wireless base station]
In addition, the wireless terminal device 202 determines that the movement operation is performed based on the type and count reference of the wireless base station device 101 that forms a cell that was located before the movement operation after the movement operation is completed. It may be determined whether to count.
 図48は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 48 is a flowchart defining another example of an operation procedure when the wireless terminal device counts the number of times of movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図48を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、移動動作前に在圏したセルを形成する無線基地局装置101が小型基地局である場合(ステップS634でYES)、以下の処理を行う。すなわち、無線端末装置202は、カウント基準に従って当該移動動作をカウントの対象とせず、移動動作の実行回数を示すカウント値CNTをインクリメントしない(ステップS636)。 Referring to FIG. 48, radio terminal apparatus 202 forms a small base station after a mobile operation such as a handover operation or a cell reselection operation is completed. (YES in step S634), the following processing is performed. That is, the wireless terminal device 202 does not count the movement operation according to the count criterion and does not increment the count value CNT indicating the number of executions of the movement operation (step S636).
 一方、無線端末装置202は、移動動作前に在圏したセルを形成する無線基地局装置101が小型基地局でない場合(ステップS634でNO)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS638)。 On the other hand, when the radio base station apparatus 101 that forms the cell that was in the area before the moving operation is not a small base station (NO in step S634), the wireless terminal device 202 counts the moving operation according to the count criterion. The value CNT is incremented (step S638).
 以上の動作により、無線端末装置202は、移動元の無線基地局装置101の種別およびカウント基準に基づいて、上記移動動作を移動動作の実行回数のカウント対象とするかどうかを判断する。 By the above operation, the wireless terminal device 202 determines whether or not the moving operation is to be counted for the number of executions of the moving operation on the basis of the type of the wireless base station device 101 that is the moving source and the count reference.
 上記ステップS634において、無線端末装置202は、移動動作の完了後において、移動元の無線基地局装置101が小型基地局である場合(ステップS634でYES)、上記移動動作をカウントの対象としない(ステップS636)。 In step S634, after the movement operation is completed, when the movement-source wireless base station device 101 is a small base station (YES in step S634), the wireless terminal device 202 does not count the movement operation (step S634). Step S636).
 これにより、無線端末装置202は、小型基地局が形成するセルからの移動動作をカウントの対象としないことにより、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 As a result, the wireless terminal device 202 incorrectly estimates that its own moving state is a faster moving state than the actual moving state by not counting the moving operation from the cell formed by the small base station. Can be prevented.
 なお、移動元の無線基地局装置101の種別は、移動元または移動先の無線基地局装置101から取得してもよいし、上記無線基地局装置101以外の他の無線基地局装置から取得してもよい。また、無線端末装置202が、予め移動元の無線基地局装置101の種別を保持しておいてもよい。 The type of the source radio base station apparatus 101 may be acquired from the source or destination radio base station apparatus 101, or may be acquired from another radio base station apparatus other than the radio base station apparatus 101. May be. Also, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement source in advance.
 また、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この際、当該無線端末装置202は、上記ステップS638において、カウント値CNTに1.0を加算し、また、上記ステップS636において、カウント値CNTに0.5を加算する。 Further, the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S638, and adds 0.5 to the count value CNT in step S636.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 [マクロ基地局に関連した移動動作に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作前または移動動作後に在圏するセルを形成する無線基地局装置101がマクロ基地局であるかどうかと、カウント基準とに基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。
[When based on the movement related to the macro base station]
In addition, the wireless terminal device 202 determines whether or not the wireless base station device 101 that forms a cell that is in the area before or after the moving operation is a macro base station after the moving operation is completed, and the count reference It may be determined whether or not the movement operation is to be counted as the number of executions of the movement operation.
 図49は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 49 is a flowchart defining another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図49を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、移動動作前に在圏したセルを形成する無線基地局装置101がマクロ基地局である場合(ステップS674でYES)、以下の処理を行う。すなわち、無線端末装置202は、カウント基準に従って当該移動動作をカウントの対象とし、移動動作の実行回数を示すカウント値CNTをインクリメントする(ステップS676)。 Referring to FIG. 49, radio terminal apparatus 202 is configured such that radio base station apparatus 101 that forms a cell in which the mobile terminal is located before the mobile operation after a mobile operation such as a handover operation or a cell reselection operation is completed. (YES in step S674), the following processing is performed. That is, the wireless terminal device 202 counts the movement operation according to the count criterion, and increments the count value CNT indicating the number of executions of the movement operation (step S676).
 一方、無線端末装置202は、移動動作前に在圏したセルを形成する無線基地局装置101がマクロ基地局でない場合(ステップS674でNO)、以下の処理を行う。 On the other hand, when the radio base station apparatus 101 that forms the cell that was located before the moving operation is not a macro base station (NO in step S674), the radio terminal apparatus 202 performs the following processing.
 すなわち、無線端末装置202は、移動動作後に在圏するセルを形成する無線基地局装置101がマクロ基地局である場合(ステップS678でYES)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS676)。 That is, when the wireless base station device 101 that forms a cell that is in the area after the moving operation is a macro base station (YES in step S678), the wireless terminal device 202 counts the moving operation according to the count criterion. The value CNT is incremented (step S676).
 一方、無線端末装置202は、移動動作後に在圏するセルを形成する無線基地局装置101がマクロ基地局でない場合(ステップS678でNO)、カウント基準に従って当該移動動作をカウントの対象とせず、カウント値CNTをインクリメントしない(ステップS680)。 On the other hand, when the wireless base station device 101 that forms a cell that is in the area after the moving operation is not a macro base station (NO in step S678), the wireless terminal device 202 does not count the moving operation according to the count criterion. The value CNT is not incremented (step S680).
 以上の動作により、無線端末装置202は、移動動作前または移動動作後に在圏するセルを形成する無線基地局装置101がマクロ基地局であるかどうかと、カウント基準とに基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断する。 With the above operation, the wireless terminal device 202 performs the moving operation based on whether or not the wireless base station device 101 that forms a cell that is located before or after the moving operation is a macro base station and the count reference. Whether or not to count the number of executions of the movement operation.
 無線端末装置202は、上記ステップS680において、マクロ基地局が形成するセルからの移動動作、またはマクロ基地局が形成するセルへの移動動作以外の移動動作を、カウントの対象としない。 In step S680, the wireless terminal device 202 does not count the movement operation other than the movement operation from the cell formed by the macro base station or the movement operation to the cell formed by the macro base station.
 具体的には、無線端末装置202は、たとえば小型基地局が形成するセルから他の小型基地局が形成するセルへの移動動作を、カウントの対象としない。 Specifically, for example, the wireless terminal device 202 does not count movement operations from a cell formed by a small base station to a cell formed by another small base station.
 これにより、無線端末装置202は、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 Thereby, the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
 なお、移動元または移動先の無線基地局装置101の種別は、移動元または移動先の無線基地局装置101から取得してもよいし、上記無線基地局装置101以外の他の無線基地局装置から取得してもよい。また、無線端末装置202が、予め移動元または移動先の無線基地局装置101の種別を保持していてもよい。 The type of the movement-source or movement-destination radio base station apparatus 101 may be acquired from the movement-source or movement-destination radio base station apparatus 101, or another radio base station apparatus other than the radio base station apparatus 101 May be obtained from Further, the wireless terminal device 202 may hold the type of the wireless base station device 101 that is the movement source or the movement destination in advance.
 また、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この際、当該無線端末装置202は、上記ステップS676において、カウント値CNTに1.0を加算し、また、上記ステップS680において、カウント値CNTに0.5を加算する。 Further, the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S676, and adds 0.5 to the count value CNT in step S680.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 [無線基地局装置の送信電力に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作前または移動動作後に在圏するセルを形成する無線基地局装置101が送信する無線信号の送信電力およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。
[Based on the transmission power of the radio base station device]
Further, the wireless terminal device 202, after the completion of the moving operation, based on the transmission power of the wireless signal transmitted by the wireless base station device 101 that forms the cell that is in the area before or after the moving operation and the count criterion, It may be determined whether or not the movement operation is to be counted.
 図50は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 50 is a flowchart that defines another example of an operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(B)に示すカウント方法リスト43に基づいて、移動動作の実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions of the movement operation is counted based on the counting method list 43 shown in FIG.
 図50を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、移動元の無線基地局装置101、または移動先の無線基地局装置101から報知情報を取得する(ステップS714)。 Referring to FIG. 50, radio terminal apparatus 202 broadcasts from the movement-source radio base station apparatus 101 or the movement-destination radio base station apparatus 101 after the movement operation such as the handover operation or the cell reselection operation is completed. Information is acquired (step S714).
 次に、無線端末装置202は、たとえば当該報知情報に基づいて、移動元の無線基地局装置101が送信する無線信号の送信電力を取得する。次に、無線端末装置202は、上記送信電力に基づいて、移動元の無線基地局装置101の種別を特定する(ステップS716)。 Next, the radio terminal device 202 acquires the transmission power of the radio signal transmitted from the source radio base station device 101 based on the broadcast information, for example. Next, the wireless terminal device 202 identifies the type of the wireless base station device 101 that is the movement source based on the transmission power (step S716).
 次に、無線端末装置202は、特定した移動元の無線基地局装置101の種別が小型基地局であると判断する場合(ステップS718でYES)、カウント基準に従って当該移動動作をカウントの対象とせず、移動動作の実行回数を示すカウント値CNTをインクリメントしない(ステップS720)。 Next, when the wireless terminal apparatus 202 determines that the type of the specified wireless base station apparatus 101 as the movement source is a small base station (YES in step S718), the wireless terminal apparatus 202 does not count the movement operation according to the count criterion. The count value CNT indicating the number of executions of the movement operation is not incremented (step S720).
 一方、無線端末装置202は、特定した移動元の無線基地局装置101の種別が小型基地局でないと判断した場合(ステップS718でNO)、以下の処理を行う。 On the other hand, when the wireless terminal device 202 determines that the identified type of the wireless base station device 101 of the movement source is not a small base station (NO in step S718), the wireless terminal device 202 performs the following processing.
 すなわち、無線端末装置202は、たとえば当該報知情報に基づいて、移動先の無線基地局装置101が送信する無線信号の送信電力を取得する。次に、無線端末装置202は、上記送信電力に基づいて、移動先の無線基地局装置101の種別を特定する(ステップS722)。 That is, the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted from the movement-destination radio base station apparatus 101 based on the notification information, for example. Next, the wireless terminal device 202 identifies the type of the movement-destination wireless base station device 101 based on the transmission power (step S722).
 次に、無線端末装置202は、特定した移動先の無線基地局装置101の種別が小型基地局であると判断する場合(ステップS724でYES)、カウント基準に従って当該移動動作をカウントの対象とせず、カウント値CNTをインクリメントしない(ステップS720)。 Next, when the wireless terminal apparatus 202 determines that the type of the specified destination wireless base station apparatus 101 is a small base station (YES in step S724), the wireless terminal apparatus 202 does not count the moving operation according to the count criterion. The count value CNT is not incremented (step S720).
 一方、無線端末装置202は、特定した移動先の無線基地局装置101の種別が小型基地局でないと判断した場合(ステップS724でNO)、カウント基準に従って当該移動動作をカウントの対象とし、カウント値CNTをインクリメントする(ステップS726)。 On the other hand, if the wireless terminal device 202 determines that the type of the specified wireless base station device 101 as the movement destination is not a small base station (NO in step S724), the wireless terminal device 202 counts the movement operation according to the count criterion. CNT is incremented (step S726).
 以上の動作により、無線端末装置202は、移動動作の完了後において、移動動作前または移動動作後に在圏するセルを形成する無線基地局装置101が送信する無線信号の送信電力およびカウント基準に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするかどうかを判断する。 With the above operation, the wireless terminal device 202 is based on the transmission power and count reference of the wireless signal transmitted by the wireless base station device 101 that forms a cell before or after the moving operation after the moving operation is completed. Thus, it is determined whether or not the movement operation is to be counted.
 上記ステップS716において、無線端末装置202は、たとえば報知情報に基づいて、移動元の無線基地局装置101が送信する無線信号の送信電力を取得する。 In step S716, the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted from the source radio base station apparatus 101 based on the broadcast information, for example.
 これにより、無線端末装置202は、取得した無線信号の送信電力に基づいて、移動元の無線基地局装置101が小型基地局であるかどうかを判断することができる。 Thereby, the wireless terminal device 202 can determine whether or not the source wireless base station device 101 is a small base station based on the acquired transmission power of the wireless signal.
 また、上記ステップS722において、無線端末装置202は、たとえば報知情報に基づいて、移動先の無線基地局装置101が送信する無線信号の送信電力を取得する。 In step S722, the radio terminal apparatus 202 acquires the transmission power of the radio signal transmitted by the movement-destination radio base station apparatus 101 based on the broadcast information, for example.
 これにより、無線端末装置202は、取得した無線信号の送信電力に基づいて、移動先の無線基地局装置101が小型基地局であるかどうかを判断することができる。 Thereby, the wireless terminal device 202 can determine whether or not the destination wireless base station device 101 is a small base station based on the acquired transmission power of the wireless signal.
 また、上記ステップS718またはS724において、無線端末装置202は、移動動作の完了後において、特定した移動元または移動先の無線基地局装置101が小型基地局であると判断する場合(ステップS718でYESまたはステップS724でYES)、カウント基準に従って当該移動動作をカウントの対象としない(ステップS720)。 In step S718 or S724, when the wireless terminal device 202 determines that the specified wireless base station device 101 that is the moving source or the moving destination is a small base station after the moving operation is completed (YES in step S718). Alternatively, YES in step S724), the moving operation is not counted according to the count standard (step S720).
 これにより、無線端末装置202は、自己の移動状態が実際より速い移動状態であると誤って推定してしまうことを防ぐことができる。 Thereby, the wireless terminal device 202 can prevent the mobile terminal device from erroneously estimating that the mobile terminal device is moving faster than it actually is.
 なお、無線端末装置202は、上記ステップS714において、移動動作の完了後に取得した報知情報に基づいて、移動元または移動先の無線基地局装置が小型基地局であるかどうかの判断を行ったが、上記移動動作前に既に取得していた情報を用いて上記判断を行ってもよい。 Note that, in step S714, the wireless terminal device 202 determines whether or not the source or destination wireless base station device is a small base station based on the notification information acquired after the completion of the moving operation. The above determination may be made using information already acquired before the moving operation.
 また、無線端末装置202は、たとえば図33の(B)に示すカウント方法リスト44におけるカウント基準である重み付け係数に基づいて、実行回数をカウントしてもよい。この際、当該無線端末装置202は、上記ステップS726において、カウント値CNTに1.0を加算し、また、上記ステップS720において、カウント値CNTに0.5を加算する。 Further, the wireless terminal device 202 may count the number of executions based on, for example, a weighting coefficient that is a counting reference in the counting method list 44 illustrated in FIG. At this time, the wireless terminal device 202 adds 1.0 to the count value CNT in step S726, and adds 0.5 to the count value CNT in step S720.
 これにより、当該無線端末装置202は、基地局の種別に応じて重み付けされた値をカウントすることができるので、自己の移動動作の実行回数を適切にカウントすることができる。 Thereby, since the wireless terminal device 202 can count the weighted value according to the type of the base station, it can appropriately count the number of times the mobile terminal performs its own mobile operation.
 また、無線端末装置202は、たとえば無線基地局装置101が送信する無線信号の送信電力、測定した上記無線信号の受信電力、および上記無線基地局装置101が形成するセルにおける滞在時間に基づいて、当該セルへの移動動作および当該セルからの移動動作を移動動作の実行回数のカウント対象とするかどうかを判断してもよい。 Further, the wireless terminal device 202, for example, based on the transmission power of the wireless signal transmitted by the wireless base station device 101, the received power of the measured wireless signal, and the stay time in the cell formed by the wireless base station device 101, It may be determined whether or not the movement operation to the cell and the movement operation from the cell are to be counted.
 具体的には、無線端末装置202は、上記滞在時間の間、上記送信電力に対する上記受信電力の比である電力比を監視し、監視した電力比に基づいて、自己が当該セルの中央近くを通過したかどうかについて判断する。 Specifically, the wireless terminal device 202 monitors a power ratio that is a ratio of the received power to the transmitted power during the stay time, and based on the monitored power ratio, the wireless terminal device 202 moves near the center of the cell. Judge whether it passed.
 無線端末装置202は、たとえば上記滞在時間が短く、かつセルの中央近くを通過する場合、自己が上記セルを高速で移動したと考え、上記セルへの移動動作および上記セルからの移動動作を移動動作の実行回数のカウント対象とすべきと判断する。 For example, when the stay time is short and the wireless terminal device 202 passes near the center of the cell, the wireless terminal device 202 considers that it has moved the cell at high speed, and moves the moving operation to and from the cell. It is determined that the operation should be counted.
 また、無線端末装置202は、たとえば上記滞在時間が短く、かつ上記セルの中央近くを通過しない場合、自己が上記セルの端部を低速で移動したと考え、上記セルへの移動動作および上記セルからの移動動作を移動動作の実行回数のカウント対象とすべきでないと判断する。 Further, for example, when the stay time is short and the wireless terminal device 202 does not pass near the center of the cell, the wireless terminal device 202 considers that it has moved the end of the cell at a low speed, and moves to the cell and the cell. It is determined that the movement operation from is not to be counted.
 これにより、無線端末装置202は、無線基地局装置101が送信する無線信号の送信電力、上記無線信号の受信電力、および上記無線基地局装置101が形成するセルにおける滞在時間に基づいて、当該セルへの移動動作および当該セルからの移動動作を移動動作の実行回数のカウント対象とすべきかどうかを適切に判断することができる。 As a result, the radio terminal device 202 determines that the cell based on the transmission power of the radio signal transmitted by the radio base station device 101, the reception power of the radio signal, and the stay time in the cell formed by the radio base station device 101. It is possible to appropriately determine whether or not the movement operation to and from the cell should be counted.
 また、無線端末装置202は、ある移動動作から次の移動動作までの滞在時間と、移動元または移動先の無線基地局装置101の種別と、移動元または移動先の無線基地局装置101から送信される無線信号の送信電力との一部、または全部の組み合わせに基づいて、移動動作をカウントの対象とするか否かについての判断を行ってもよい。 Also, the wireless terminal device 202 transmits the stay time from one movement operation to the next movement operation, the type of the movement-source or movement-destination radio base station apparatus 101, and the movement-source or movement-destination radio base station apparatus 101. Whether or not the movement operation is to be counted may be determined based on a part or all combination with the transmission power of the radio signal to be transmitted.
 [カウント方法リストにおけるカウント対象に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作後に在圏するセルを形成する無線基地局装置101の、カウント方法リスト41における「カウント対象」に基づいて、移動動作の実行回数に、当該移動動作をカウントするかどうかを判断してもよい。
[Based on the counting target in the counting method list]
Further, the wireless terminal device 202 performs the number of executions of the moving operation based on the “count target” in the counting method list 41 of the wireless base station device 101 that forms a cell that is in the area after the moving operation after the moving operation is completed. In addition, it may be determined whether to count the movement operation.
 図51は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 51 is a flowchart that defines another example of an operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図32の(A)に示すカウント方法リスト41に基づいて、実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions is counted based on the counting method list 41 shown in FIG.
 図51を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、カウント方法リスト41を参照し、移動動作後に在圏するセルを形成する無線基地局装置101のIDに対応するカウント対象を取得する(ステップS924)。 Referring to FIG. 51, the wireless terminal device 202 refers to the counting method list 41 after completing a moving operation such as a handover operation or a cell reselection operation, and forms a cell that is in the area after the moving operation. The count target corresponding to the ID of the station apparatus 101 is acquired (step S924).
 次に、無線端末装置202は、当該カウント対象が「真」である場合(ステップS926でYES)、当該移動動作をカウントの対象とし、移動動作の実行回数を示すカウント値CNTをインクリメントする(ステップS930)。 Next, when the count target is “true” (YES in step S926), the wireless terminal device 202 sets the movement operation as a count target and increments a count value CNT indicating the number of executions of the movement operation (step S926). S930).
 一方、無線端末装置202は、当該カウント対象が「偽」である場合(ステップS926でNO)、当該移動動作をカウントの対象とせず、カウント値CNTをインクリメントしない(ステップS928)。 On the other hand, when the count target is “false” (NO in step S926), the wireless terminal device 202 does not count the movement operation and does not increment the count value CNT (step S928).
 無線端末装置202は、上記ステップS926において、無線基地局装置101から取得したカウント方法リスト41における「カウント対象」に基づいて、当該移動動作を移動動作の実行回数のカウント対象とするか否かについて判断する。 In step S926, the wireless terminal device 202 determines whether the moving operation is to be counted based on the “count target” in the counting method list 41 acquired from the radio base station device 101. to decide.
 これにより、無線端末装置202は、無線基地局装置101が指定したカウント基準であるカウント対象に基づいて、移動動作の実行回数をカウントすることができる。 Thereby, the wireless terminal device 202 can count the number of executions of the movement operation based on the count target which is the count reference designated by the wireless base station device 101.
 また、無線端末装置202は、たとえば広範なエリアに設置された複数の小型基地局を管理する管理基地局により作成されたカウント基準に基づいて、移動動作の実行回数をカウントすることにより、自己の移動状態を適切に推定することができる。 In addition, the wireless terminal device 202 counts the number of executions of the mobile operation based on the count reference created by the management base station that manages a plurality of small base stations installed in a wide area, for example. The moving state can be estimated appropriately.
 なお、無線端末装置202は、カウント基準を、報知情報に含まれるカウント方法リスト41から取得してもよいし、報知情報に含まれる周辺セル情報から取得してもよいし、ハンドオーバコマンドから取得してもよい。 Note that the wireless terminal device 202 may acquire the count reference from the count method list 41 included in the broadcast information, may be acquired from neighboring cell information included in the broadcast information, or may be acquired from a handover command. May be.
 [カウント方法リストにおける重み付け係数に基づく場合]
 また、無線端末装置202は、移動動作の完了後において、移動動作後に在圏するセルを形成する無線基地局装置101の、カウント方法リスト42における「重み付け係数」に基づいて、当該移動動作の実行回数をカウントしてもよい。
[Based on the weighting factor in the count method list]
In addition, the wireless terminal device 202 executes the moving operation based on the “weighting coefficient” in the counting method list 42 of the wireless base station device 101 that forms a cell that is in the area after the moving operation after the moving operation is completed. The number of times may be counted.
 図52は、本発明の実施の形態に係る無線通信システムにおいて、無線端末装置が移動動作の実行回数をカウントする際の動作手順の他の例を定めたフローチャートである。 FIG. 52 is a flowchart that defines another example of the operation procedure when the wireless terminal device counts the number of executions of the movement operation in the wireless communication system according to the embodiment of the present invention.
 以下は、図43に示すステップS474および図44に示すステップS494に示す、カウント基準に従って移動動作の実行回数をカウントする無線端末装置202の詳細な動作である。当該無線端末装置202は、たとえば図33の(A)に示すカウント方法リスト42に基づいて、実行回数をカウントする状況を想定する。 The following is a detailed operation of the wireless terminal device 202 that counts the number of executions of the moving operation according to the counting standard, as shown in step S474 shown in FIG. 43 and step S494 shown in FIG. For example, the wireless terminal device 202 assumes a situation in which the number of executions is counted based on the counting method list 42 shown in FIG.
 図52を参照して、無線端末装置202は、ハンドオーバ動作またはセル再選択動作等の移動動作が完了した後において、カウント方法リスト42を参照し、移動動作後に在圏するセルを形成する無線基地局装置101のIDに対応する重み付け係数を取得する(ステップS944)。 Referring to FIG. 52, radio terminal apparatus 202 refers to count method list 42 after a mobile operation such as a handover operation or a cell reselection operation is completed, and forms a cell that is in the area after the mobile operation. A weighting coefficient corresponding to the ID of the station apparatus 101 is acquired (step S944).
 次に、無線端末装置202は、移動動作の実行回数を示すカウント値CNTに、当該重み付け係数を加算する(ステップS946)。 Next, the wireless terminal device 202 adds the weighting coefficient to the count value CNT indicating the number of executions of the movement operation (step S946).
 上記ステップS946において、無線端末装置202は、無線基地局装置101から取得したカウント方法リストにおける「重み付け係数」を、移動動作の実行回数に加算する。 In step S946, the wireless terminal device 202 adds the “weighting coefficient” in the count method list acquired from the wireless base station device 101 to the number of executions of the movement operation.
 これにより、無線端末装置202は、無線基地局装置101が指定したカウント基準である重み付け係数に基づいて、移動動作の実行回数をカウントすることができる。 Thereby, the radio terminal apparatus 202 can count the number of times of the movement operation based on the weighting coefficient which is the count standard designated by the radio base station apparatus 101.
 また、無線端末装置202は、たとえば複数のマクロ基地局を含むような広域の無線基地局装置101を管理する管理基地局により作成されたカウント基準に基づいて、移動動作の実行回数をカウントすることにより、自己の移動状態を適切に推定することができる。 In addition, the wireless terminal device 202 counts the number of executions of the moving operation based on a count reference created by the management base station that manages the wide-area wireless base station device 101 including, for example, a plurality of macro base stations. Thus, it is possible to appropriately estimate its own movement state.
 なお、無線端末装置202は、カウント基準を、報知情報に含まれるカウント方法リスト42から取得してもよいし、報知情報に含まれる周辺セル情報から取得してもよいし、ハンドオーバコマンドから取得してもよい。 Note that the radio terminal apparatus 202 may acquire the count reference from the count method list 42 included in the broadcast information, may be acquired from neighboring cell information included in the broadcast information, or may be acquired from a handover command. May be.
 ところで、非特許文献1に記載されるような不適切な移動動作が行なわれると、通信システムにおいて、通信断および通信トラフィックの増大等、種々の問題が生じる。 By the way, when an inappropriate movement operation described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system.
 これに対して、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202の移動動作の実行回数をカウントする。移動状態推定部12は、カウント部13によってカウントされた実行回数に基づいて、自己の無線端末装置202の移動状態を推定する。そして、カウント部13は、無線基地局装置101から取得したカウント基準に従ってカウントを行う。 On the other hand, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 counts the number of times that the wireless terminal device 202 executes the moving operation. The movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. Then, the count unit 13 performs counting according to the count standard acquired from the radio base station apparatus 101.
 このような構成により、無線端末装置202と比べて広範囲の通信環境を把握する無線基地局装置101から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置202は、自己の移動状態を適切に推定することができる。 With such a configuration, the wireless terminal device 202 can perform counting according to the count reference acquired from the wireless base station device 101 that grasps a wide communication environment compared to the wireless terminal device 202. Can be estimated appropriately.
 これにより、無線端末装置202は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device 202 moves in the heterogeneous network, the wireless terminal device 202 can appropriately estimate its own moving state.
 そして、無線端末装置202は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the radio | wireless terminal apparatus 202 can adjust the timing of a movement operation | movement appropriately, for example based on the own estimated movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、実行された自己の無線端末装置202の移動動作をカウント基準に従って重み付けし、重み付けした値を用いてカウントを行う。 Also, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 weights the performed movement operation of the wireless terminal device 202 according to the counting standard, and performs the counting using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、移動動作の実行回数を適切にカウントすることができる。 With such a configuration, it is possible to count using a value that is weighted according to the type of movement operation, so it is possible to appropriately count the number of executions of the movement operation.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202の移動動作の実行回数をカウントする。移動状態推定部12は、カウント部13によってカウントされた実行回数に基づいて、自己の無線端末装置202の移動状態を推定する。そして、カウント部13は、実行された自己の無線端末装置202の移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いてカウントを行う。 In addition, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 counts the number of times that the wireless terminal device 202 executes the moving operation. The movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. Then, the count unit 13 weights the executed movement operation of the wireless terminal device 202 according to a predetermined count standard, and performs a count using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置202は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device 202 moves in the heterogeneous network, the wireless terminal device 202 can appropriately estimate its own moving state.
 そして、無線端末装置202は、適切に推定した自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができる。これにより、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 And the radio | wireless terminal apparatus 202 can adjust the timing of a movement operation | movement appropriately, for example based on the own estimated movement state. Thereby, generation | occurrence | production of an improper movement operation | movement is suppressed and the communication in a communication system can be stabilized.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、実行された自己の無線端末装置202の移動動作が、カウント基準に従う所定条件を満たす場合には、所定条件を満たす移動動作をカウントの対象から除外する。 Moreover, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 moves the predetermined condition when the executed movement operation of the wireless terminal device 202 satisfies the predetermined condition according to the count criterion. Exclude actions from counting.
 このような構成により、カウント基準に従って上記カウントの対象として適切な移動動作を選択することができるので、移動動作の実行回数を適切にカウントすることができる。 With such a configuration, it is possible to select an appropriate moving operation as the target of counting according to the count standard, and therefore it is possible to appropriately count the number of executions of the moving operation.
 また、本発明の実施の形態に係る無線端末装置では、自己の無線端末装置202のハンドオーバ動作におけるハンドオーバ元の無線基地局装置101から受信したハンドオーバコマンドに含まれるカウント基準を取得する。 Also, the radio terminal apparatus according to the embodiment of the present invention acquires the count reference included in the handover command received from the handover source radio base station apparatus 101 in the handover operation of its own radio terminal apparatus 202.
 このような構成により、移動動作の実行回数をカウントするために必要な情報を、無線端末装置202の移動動作を管理する無線基地局装置101から取得することができる。 With this configuration, information necessary for counting the number of executions of the movement operation can be acquired from the radio base station apparatus 101 that manages the movement operation of the radio terminal apparatus 202.
 また、ハンドオーバ元の無線基地局装置101においては、当該無線基地局装置101が形成するセルに在圏する無線端末装置202の台数が特に少ない場合、報知情報によりカウント基準を繰り返して送信するよりも、無線端末装置202に対してカウント基準を効率よく通知することができる。 Further, in the radio base station apparatus 101 that is the handover source, when the number of radio terminal apparatuses 202 existing in the cell formed by the radio base station apparatus 101 is particularly small, it is more than the count reference that is repeatedly transmitted by the broadcast information. The count reference can be notified to the wireless terminal device 202 efficiently.
 また、本発明の実施の形態に係る無線端末装置では、設定部11は、移動状態推定部12によって推定された移動状態に基づいて、自己の無線端末装置202の移動動作の実行判断に関わる自己の無線端末装置202の設定を行う。 Further, in the wireless terminal device according to the embodiment of the present invention, setting unit 11 is self-related to the execution determination of the movement operation of own wireless terminal device 202 based on the movement state estimated by movement state estimation unit 12. The wireless terminal device 202 is set.
 このような構成により、自己の移動状態に基づいて、たとえば移動動作のタイミング等のパラメータの設定を適切に行うことができる。 With such a configuration, it is possible to appropriately set parameters such as the timing of the moving operation, for example, based on the own moving state.
 また、本発明の実施の形態に係る無線端末装置では、通知部17は、移動状態推定部12によって推定された移動状態を、無線基地局装置101へ通知する。 Moreover, in the radio terminal apparatus according to the embodiment of the present invention, the notification unit 17 notifies the radio base station apparatus 101 of the movement state estimated by the movement state estimation unit 12.
 このような構成により、当該無線基地局装置101において、無線端末装置202により通知された移動状態を用いることにより、適切なタイミングで当該無線端末装置202のハンドオーバ動作が行われるので、当該無線端末装置202における不適切なハンドオーバ動作の発生を抑制することができる。 With such a configuration, the wireless base station apparatus 101 performs the handover operation of the wireless terminal apparatus 202 at an appropriate timing by using the movement state notified by the wireless terminal apparatus 202. The occurrence of an inappropriate handover operation in 202 can be suppressed.
 また、本発明の実施の形態に係る無線端末装置では、設定部11は、上記移動状態に基づいて、自己の無線端末装置202のハンドオーバ動作の実行判断に関わる自己の無線端末装置202の動作に関する設定を行う。 Also, in the wireless terminal device according to the embodiment of the present invention, the setting unit 11 relates to the operation of the wireless terminal device 202 related to the determination of the handover operation of the wireless terminal device 202 based on the movement state. Set up.
 このような構成により、ハンドオーバ動作の実行判断に関わる動作を行うタイミングを調整することができる。無線端末装置202の移動状態に基づいて上記タイミングの調整を適切に行うことにより、ハンドオーバ動作のタイミングが適正化され、不適切なハンドオーバ動作の発生を抑制することができる。 With such a configuration, it is possible to adjust the timing for performing the operation related to the execution determination of the handover operation. By appropriately adjusting the timing based on the movement state of the wireless terminal device 202, the timing of the handover operation is optimized, and the occurrence of an inappropriate handover operation can be suppressed.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、無線基地局装置101から取得した情報に基づいて、上記所定条件を満たすか否かを判断する。 Moreover, in the wireless terminal device according to the embodiment of the present invention, the count unit 13 determines whether or not the predetermined condition is satisfied based on the information acquired from the wireless base station device 101.
 このような構成により、たとえば無線基地局装置101における無線信号の送信電力の設定変更により通信システムの構成が変更される場合においても、当該変更を無線端末装置202において速やかに反映させることができるので、通信システムの変更に対する柔軟性を高めることができる。 With such a configuration, for example, even when the configuration of the communication system is changed by changing the setting of the transmission power of the radio signal in the radio base station device 101, the change can be quickly reflected in the radio terminal device 202. , Flexibility for changing the communication system can be increased.
 また、周辺の無線基地局装置101の情報を予め取得することにより、移動動作の開始に先立って当該移動動作をカウントの対象とするか否かを判断することができる。これにより、無線端末装置202は、当該移動動作を自己の移動状態の推定に速やかに反映させることができる。 Further, by acquiring information of the surrounding radio base station apparatus 101 in advance, it is possible to determine whether or not the moving operation is to be counted prior to the start of the moving operation. Thereby, the radio | wireless terminal apparatus 202 can reflect the said movement operation | movement rapidly in estimation of an own movement state.
 また、本発明の実施の形態に係る無線端末装置では、基地局種別判定部15は、移動動作における移動元または移動先の無線基地局装置101から送信される無線信号の送信電力に基づいて、上記移動動作における移動元または移動先の無線基地局装置101の種別を判定する。そして、カウント部13は、基地局種別判定部15の判定結果に基づいて、上記移動動作をカウントの対象とするか否かを判断する。 Moreover, in the radio terminal apparatus according to the embodiment of the present invention, the base station type determination unit 15 is based on the transmission power of the radio signal transmitted from the source or destination radio base station apparatus 101 in the movement operation. The type of the wireless base station apparatus 101 that is the movement source or the movement destination in the movement operation is determined. Then, based on the determination result of the base station type determination unit 15, the count unit 13 determines whether or not the moving operation is to be counted.
 このような構成により、無線基地局装置101が送信する無線信号の送信電力に基づいて、当該無線基地局装置101の種別を適切に判別し、上記カウントの対象として適切な移動動作を選択することができる。 With such a configuration, based on the transmission power of the radio signal transmitted by the radio base station apparatus 101, the type of the radio base station apparatus 101 is appropriately determined, and an appropriate moving operation is selected as the target of the count. Can do.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202の無線基地局装置101への移動動作が行われてから他の無線基地局装置101への移動動作が行われるまでの滞在時間が所定のしきい値未満の場合に、上記移動動作をカウントの対象から除外する。 Further, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 moves to the wireless base station device 101 after the wireless terminal device 202 moves to the wireless base station device 101. When the stay time until the moving operation is performed is less than a predetermined threshold, the moving operation is excluded from the count target.
 このように、移動動作の完了後に在圏するセルにおける滞在時間を選択基準にする構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 As described above, with the configuration in which the stay time in the cell that is in the area after completion of the moving operation is used as a selection criterion, it is possible to select an appropriate moving operation as a target of the counting and appropriately estimate its own moving state.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202の他の無線基地局装置101から小型基地局への移動動作が行われた場合に、上記移動動作をカウントの対象から除外する。 Further, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 performs the above operation when a movement operation from the other wireless base station device 101 to the small base station is performed. Exclude moving movements from counting.
 このように、他の無線基地局装置101から小型基地局への移動動作をカウントの対象から除外する構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 As described above, by selecting the movement operation from the other radio base station apparatus 101 to the small base station from the count target, an appropriate movement operation is selected as the count target, and the own movement state is appropriately estimated. can do.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202の小型基地局から他の無線基地局装置101への移動動作が行われた場合に、上記移動動作をカウントの対象から除外する。 Further, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 performs the above operation when the mobile terminal device 202 moves from the small base station to another wireless base station device 101. Exclude moving movements from counting.
 このように、小型基地局から他の無線基地局装置101への移動動作をカウントの対象から除外する構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 In this way, with the configuration in which the movement operation from the small base station to another radio base station apparatus 101 is excluded from the object of counting, an appropriate movement operation is selected as the object of counting and the own movement state is estimated appropriately. can do.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202のマクロ基地局から他の無線基地局装置101への移動動作または他の無線基地局装置101からマクロ基地局への移動動作が行われた場合に、上記移動動作をカウントの対象とする。 Further, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 moves the own wireless terminal device 202 from the macro base station to another wireless base station device 101 or another wireless base station device 101. When the moving operation from the base station to the macro base station is performed, the moving operation is counted.
 このように、サイズが大きいマクロセルを移動元または移動先とする移動動作をカウント対象とする構成により、上記カウントの対象として適切な移動動作を選択し、自己の移動状態を適切に推定することができる。 In this way, with the configuration in which the movement operation with the macro cell having a large size as the movement source or the movement destination is counted, it is possible to select an appropriate movement operation as the target of the counting and appropriately estimate its own movement state. it can.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202のハンドオーバ動作の実行回数をカウントする。移動状態推定部12は、カウント部13によってカウントされた実行回数に基づいて、自己の無線端末装置202の移動状態を推定する。設定部11は、移動状態推定部12によって推定された移動状態に基づいて、TTTの値を設定する。受信電力測定部16は、無線基地局装置101から送信される無線信号の受信電力を測定し、測定結果がTTTで示される時間継続して所定条件を満たす場合に、測定結果を示すメジャメントレポートを通信接続先の無線基地局装置101へ、通知部17経由で送信する。そして、カウント部13は、無線基地局装置101から取得したカウント基準に従ってカウントを行う。 In addition, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 counts the number of times that the wireless terminal device 202 executes the handover operation. The movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. The setting unit 11 sets the TTT value based on the movement state estimated by the movement state estimation unit 12. The reception power measurement unit 16 measures the reception power of the radio signal transmitted from the radio base station apparatus 101. When the measurement result continuously satisfies a predetermined condition indicated by TTT, a measurement report indicating the measurement result is displayed. The data is transmitted to the communication base station 101 via the notification unit 17. Then, the count unit 13 performs counting according to the count standard acquired from the radio base station apparatus 101.
 このような構成により、無線端末装置202と比べて広範囲の通信環境を把握する無線基地局装置101から取得したカウント基準に従ってカウントを行うことができるので、無線端末装置202は、自己の移動状態を適切に推定することができる。 With such a configuration, the wireless terminal device 202 can perform counting according to the count reference acquired from the wireless base station device 101 that grasps a wide communication environment compared to the wireless terminal device 202. Can be estimated appropriately.
 これにより、無線端末装置202は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device 202 moves in the heterogeneous network, the wireless terminal device 202 can appropriately estimate its own moving state.
 そして、無線端末装置202は、3GPPで規定された無線端末装置202によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 The wireless terminal device 202 appropriately adjusts the TTT based on the appropriately estimated own movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal device 202 defined by 3GPP. As a result, the timing of the handover operation can be adjusted appropriately.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 また、本発明の実施の形態に係る無線端末装置では、カウント部13は、自己の無線端末装置202のハンドオーバ動作の実行回数をカウントする。移動状態推定部12は、カウント部13によってカウントされた実行回数に基づいて、自己の無線端末装置202の移動状態を推定する。設定部11は、移動状態推定部12によって推定された移動状態に基づいて、TTTの値を設定する。受信電力測定部16は、無線基地局装置101から送信される無線信号の受信電力を測定し、測定結果がTTTで示される時間継続して所定条件を満たす場合に、測定結果を示すメジャメントレポートを通信接続先の無線基地局装置101へ、通知部17経由で送信する。そして、カウント部13は、実行された自己の無線端末装置202のハンドオーバ動作を所定のカウント基準に従って重み付けし、重み付けした値を用いてカウントを行う。 In addition, in the wireless terminal device according to the embodiment of the present invention, the counting unit 13 counts the number of times that the wireless terminal device 202 executes the handover operation. The movement state estimation unit 12 estimates the movement state of its own wireless terminal device 202 based on the number of executions counted by the counting unit 13. The setting unit 11 sets the TTT value based on the movement state estimated by the movement state estimation unit 12. The reception power measurement unit 16 measures the reception power of the radio signal transmitted from the radio base station apparatus 101. When the measurement result continuously satisfies a predetermined condition indicated by TTT, a measurement report indicating the measurement result is displayed. The data is transmitted to the communication base station 101 via the notification unit 17. Then, the count unit 13 weights the executed handover operation of the wireless terminal device 202 according to a predetermined count standard, and counts using the weighted value.
 このような構成により、移動動作の種別に応じて重み付けした値を用いてカウントすることができるので、自己の移動状態を適切に推定することができる。 With such a configuration, it is possible to count using a value weighted according to the type of movement operation, so it is possible to appropriately estimate its own movement state.
 これにより、無線端末装置202は、ヘテロジーニアスネットワークにおいて移動する場合においても、自己の移動状態を適切に推定することができる。 Thereby, even when the wireless terminal device 202 moves in the heterogeneous network, the wireless terminal device 202 can appropriately estimate its own moving state.
 そして、無線端末装置202は、3GPPで規定された無線端末装置202によるハンドオーバ動作のタイミング調整の機能を実現するために、適切に推定した自己の移動状態に基づいて、TTTの調整を適切に行うことにより、ハンドオーバ動作のタイミングを適切に調整することが可能となる。 The wireless terminal device 202 appropriately adjusts the TTT based on the appropriately estimated own movement state in order to realize the function of adjusting the timing of the handover operation by the wireless terminal device 202 defined by 3GPP. As a result, the timing of the handover operation can be adjusted appropriately.
 これにより、不適切なハンドオーバ動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 This can suppress the occurrence of an inappropriate handover operation and stabilize communication in the communication system.
 また、本発明の実施の形態に係る無線基地局装置では、カウント方法リスト作成部22は、移動動作を行なうことにより複数の無線基地局装置101と通信可能であり、かつカウント基準に従って移動動作の実行回数をカウントする無線端末装置202について、カウント基準を作成する。そして、カウント方法リスト通知部23は、カウント方法リスト作成部22によって作成されたカウント基準を、他の無線基地局装置101または無線端末装置202に通知する。 In addition, in the radio base station apparatus according to the embodiment of the present invention, count method list creation unit 22 can communicate with a plurality of radio base station apparatuses 101 by performing a move operation, and perform the move operation according to the count criterion. A count reference is created for the wireless terminal device 202 that counts the number of executions. Then, the count method list notifying unit 23 notifies the other radio base station device 101 or the radio terminal device 202 of the count reference created by the count method list creating unit 22.
 このように、たとえば無線端末装置202または他の無線基地局装置101へ当該カウント基準を通知することにより、当該カウント基準に基づいて、通信システムにおける無線端末装置202の移動状態を、無線端末装置202において適切に推定することができる。 In this way, for example, by notifying the wireless terminal device 202 or another wireless base station device 101 of the count reference, the movement state of the wireless terminal device 202 in the communication system is changed based on the count reference. Can be estimated appropriately.
 これにより、無線端末装置202は、自己の移動状態に基づいて、たとえば移動動作のタイミングを適切に調整することができるので、不適切な移動動作の発生が抑制され、通信システムにおける通信の安定化を図ることができる。 Thereby, the wireless terminal device 202 can appropriately adjust the timing of the movement operation, for example, based on its own movement state, so that the occurrence of an inappropriate movement operation is suppressed and the communication in the communication system is stabilized. Can be achieved.
 また、たとえば、ある無線基地局装置101が、不適切な移動動作を含む複数の移動動作を管理する場合、不適切な移動動作の発生状況を考慮した上で、適切なカウント基準を作成することができる。 Also, for example, when a certain radio base station apparatus 101 manages a plurality of movement operations including an inappropriate movement operation, an appropriate count reference should be created in consideration of the occurrence of the inappropriate movement operation. Can do.
 また、本発明の実施の形態に係る無線基地局装置では、カウント方法リスト作成部22は、各無線基地局装置101を重み付けする。そして、カウント方法リスト通知部23は、カウント方法リスト作成部22による重み付け結果をカウント基準として通知する。 Moreover, in the radio base station apparatus according to the embodiment of the present invention, the counting method list creation unit 22 weights each radio base station apparatus 101. Then, the counting method list notifying unit 23 notifies the weighting result by the counting method list creating unit 22 as a count reference.
 このような構成により、無線基地局装置101毎に、移動動作のカウント基準を細かく重み付けすることができるので、通信システムにおける無線端末装置202の移動状態を、当該カウント基準に基づいて適切に推定することができる。 With such a configuration, it is possible to finely weight the movement operation count reference for each radio base station apparatus 101. Therefore, the movement state of the radio terminal apparatus 202 in the communication system is appropriately estimated based on the count reference. be able to.
 また、本発明の実施の形態に係る無線基地局装置では、カウント方法リスト通知部23は、カウント方法リスト作成部22による重み付け結果を各無線基地局装置101に通知する。 Also, in the radio base station apparatus according to the embodiment of the present invention, count method list notifying section 23 notifies each radio base station apparatus 101 of the weighting result by count method list creating section 22.
 このような構成により、たとえばある無線基地局装置101が、自己により形成されるセル内に位置する他の無線基地局装置101を管理する場合、当該無線基地局装置101は、当該他の無線基地局装置101の設置数の密度に応じた重み付け結果を、当該他の無線基地局装置101へ送信することができる。 With such a configuration, for example, when a certain radio base station apparatus 101 manages another radio base station apparatus 101 located in a cell formed by itself, the radio base station apparatus 101 A weighting result according to the density of the number of installed station apparatuses 101 can be transmitted to the other radio base station apparatus 101.
 これにより、当該無線基地局装置101は、当該重み付け結果に基づいて、無線端末装置202に対して移動状態を適切に推定させることができるので、広範なエリアにわたって無線端末装置202の移動動作を最適化することができる。 Thereby, the radio base station apparatus 101 can appropriately cause the radio terminal apparatus 202 to estimate the movement state based on the weighting result, so that the movement operation of the radio terminal apparatus 202 is optimized over a wide area. Can be
 なお、本発明の実施の形態に係る無線通信システムでは、無線基地局装置101が通信制御装置として動作する。すなわち、無線基地局装置101が、カウント基準を含むカウント方法リスト41,42,43,44を作成し、作成したカウント方法リスト41,42,43,44を他の無線基地局装置101または無線端末装置202へ送信する構成であるとしたが、これに限定するものではない。通信制御装置は、1または複数の無線基地局装置101を管理するための管理装置であってもよい。具体的には、MME162またはコアネットワーク301と通信接続するOAM(Operation, Administration, and Maintenance)サーバ等、無線基地局装置101を管理するための管理装置が、カウント基準を含むカウント方法リスト41,42,43,44を作成し、作成したカウント方法リスト41,42,43,44を他の無線基地局装置101へ送信する構成であってもよい。 In the radio communication system according to the embodiment of the present invention, radio base station apparatus 101 operates as a communication control apparatus. That is, the radio base station apparatus 101 creates count method lists 41, 42, 43, and 44 including a count reference, and the created count method lists 41, 42, 43, and 44 are used as another radio base station apparatus 101 or a radio terminal. Although the configuration is such that the data is transmitted to the apparatus 202, the present invention is not limited to this. The communication control apparatus may be a management apparatus for managing one or a plurality of radio base station apparatuses 101. Specifically, a management apparatus for managing the radio base station apparatus 101, such as an OAM (Operation, Administration, Administration and Maintenance) server that is communicatively connected to the MME 162 or the core network 301, count method lists 41 and 42 including a count reference. , 43, 44 may be created, and the created count method list 41, 42, 43, 44 may be transmitted to another radio base station apparatus 101.
 この場合、管理装置において、基地局検出部は、たとえば休止状態にある周辺基地局が始動することにより、X2インタフェースを介した当該周辺基地局との通信接続の確立を検出すると、当該周辺基地局のIDをカウント方法リスト作成部へ出力する。 In this case, in the management device, the base station detection unit detects the establishment of the communication connection with the peripheral base station via the X2 interface, for example, when the peripheral base station in a dormant state is started. Are output to the counting method list creation unit.
 カウント方法リスト作成部は、検出された無線基地局装置101のIDを基地局検出部から受けると、受けたIDに基づいて、たとえばカウント基準を示すカウント方法リスト41または42を更新する。そして、カウント方法リスト作成部は、たとえば更新したカウント方法リスト41または42を、カウント方法リスト通知部へ出力する。 When the count method list creating unit receives the detected ID of the radio base station apparatus 101 from the base station detecting unit, the count method list creating unit updates the count method list 41 or 42 indicating the count reference, for example, based on the received ID. Then, the count method list creation unit outputs, for example, the updated count method list 41 or 42 to the count method list notifying unit.
 カウント方法リスト通知部は、カウント方法リスト作成部からたとえばカウント方法リスト41または42を受けると、受けたカウント方法リスト41または42の一部または全部を他の無線基地局装置101へ送信する。 When the count method list notifying unit receives, for example, the count method list 41 or 42 from the count method list creating unit, the count method list notifying unit transmits a part or all of the received count method list 41 or 42 to another radio base station apparatus 101.
 このような構成により、無線通信システム401において、各無線基地局装置101がカバーする領域が変わってしまう場合においても、柔軟に対応することができる。 With such a configuration, even when the area covered by each radio base station apparatus 101 changes in the radio communication system 401, it is possible to flexibly cope with it.
 具体的には、たとえば、無線通信システム401において、無線基地局装置101が新たに追加された場合、各無線基地局装置101が送信する無線信号の送信電力が変更されることにより当該各無線基地局装置101が形成するセルの大きさが変更された場合、または当該セル内において建物が新たに建設された場合において、各無線基地局装置101がカバーする領域が変わってしまう。 Specifically, for example, when the radio base station apparatus 101 is newly added in the radio communication system 401, each radio base station is changed by changing the transmission power of the radio signal transmitted by each radio base station apparatus 101. When the size of the cell formed by the station apparatus 101 is changed, or when a building is newly constructed in the cell, the area covered by each radio base station apparatus 101 changes.
 このため、たとえば、あるマクロ基地局が形成するマクロセル内に位置していた小型基地局が、他のマクロ基地局が形成するマクロセル内に位置するようになったりすることにより、無線基地局装置101が形成するセルの隣接セルが変わってしまったりする。 For this reason, for example, when a small base station located in a macro cell formed by a certain macro base station comes to be located in a macro cell formed by another macro base station, the radio base station apparatus 101 The cell adjacent to the cell formed by may change.
 このような場合、ある管理基地局が管理する被管理基地局が、他の管理基地局により管理されるようになったりするため、管理基地局は、適切なカウント方法リストを作成できなかったりしてしまうという問題が発生する。 In such a case, the managed base station managed by a certain management base station may be managed by another management base station, so the management base station may not be able to create an appropriate count method list. The problem of end up occurs.
 管理装置が、複数のマクロ基地局を含むような広域の無線基地局装置101を管理することにより、各無線基地局装置101のカバーエリアが変更された場合においても柔軟に対応することができるので、カウント方法リストを適切に作成することができる。 Since the management apparatus manages the wide-area radio base station apparatus 101 including a plurality of macro base stations, it can flexibly cope with a change in the cover area of each radio base station apparatus 101. The counting method list can be appropriately created.
 なお、本発明の実施の形態に係る無線端末装置202は、移動動作の完了後に移動状態の更新処理を行ったが、これに限定するものではない。たとえば、無線端末装置202は、各無線基地局装置101の報知情報を保存しておき、所定回数移動動作が完了した後に、上記移動動作を移動動作の実行回数のカウント対象とするかどうかを保存した各報知情報に基づいて判断した後、移動状態の更新処理を行ってもよい。 In addition, although the wireless terminal device 202 which concerns on embodiment of this invention performed the update process of the movement state after completion of movement operation | movement, it is not limited to this. For example, the radio terminal apparatus 202 saves the broadcast information of each radio base station apparatus 101, and saves whether or not the moving operation is to be counted for the number of executions of the moving operation after the moving operation is completed a predetermined number of times. After the determination is made based on each notification information, the movement state update process may be performed.
 また、本発明の実施の形態に係る無線端末装置202は、在圏するセルにおける滞在時間を当該無線端末装置202が計測したが、これに限定するものではない。たとえば、無線基地局装置101が、自己が形成するセルに在圏する無線端末装置202の滞在時間を計測してもよい。 Moreover, although the radio | wireless terminal apparatus 202 which concerns on embodiment of this invention measured the staying time in the cell which is located in the said radio | wireless terminal apparatus 202, it is not limited to this. For example, the radio base station apparatus 101 may measure the staying time of the radio terminal apparatus 202 residing in a cell formed by itself.
 また、本発明の実施の形態に係る無線端末装置202は、移動動作を行う際に、接続確立状態のハンドオーバ回数とアイドル状態のセル再選択回数を独立にカウントする必要はない。たとえば、無線端末装置202は、接続確立状態およびアイドル状態を交互に繰り返しながら移動動作を行う際には、ハンドオーバ回数およびセル再選択回数を合わせた値に基づいて自己の移動状態を推定してもよい。 In addition, the wireless terminal device 202 according to the embodiment of the present invention does not need to count the number of handovers in a connection establishment state and the number of cell reselections in an idle state independently when performing a moving operation. For example, when performing a moving operation while alternately repeating a connection establishment state and an idle state, the wireless terminal device 202 estimates its own movement state based on a value obtained by combining the number of handovers and the number of cell reselections. Good.
 上記実施の形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記説明ではなく特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the above embodiment is illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
 11 設定部
 12 移動状態推定部
 13 カウント部
 14 タイマ
 15 基地局種別判定部
 16 受信電力測定部(受信電力報告部)
 17 通知部(受信電力報告部)
 21 基地局検出部(カウント基準作成部)
 22 カウント方法リスト作成部(カウント基準作成部)
 23 カウント方法リスト通知部(カウント基準通知部)
 81 アンテナ
 82 サーキュレータ
 83 無線受信部
 84 無線送信部
 85 信号処理部
 86 受信信号処理部
 87 送信信号処理部
 88 制御部
 89 入出力部
 91 アンテナ
 92 サーキュレータ
 93 無線受信部
 94 無線送信部
 95 信号処理部
 96 受信信号処理部
 97 送信信号処理部
 98 制御部
 101 無線基地局装置(通信制御装置)
 161 S-GW
 162 MME
 163 P-GW
 202 無線端末装置
 301 コアネットワーク
 302 IP網
DESCRIPTION OF SYMBOLS 11 Setting part 12 Movement state estimation part 13 Count part 14 Timer 15 Base station classification determination part 16 Received power measuring part (Received power report part)
17 Notification section (Received power report section)
21 Base station detection unit (count reference creation unit)
22 Count method list creation section (count reference creation section)
23 Count method list notification section (count reference notification section)
DESCRIPTION OF SYMBOLS 81 Antenna 82 Circulator 83 Wireless receiving part 84 Wireless transmission part 85 Signal processing part 86 Reception signal processing part 87 Transmission signal processing part 88 Control part 89 Input / output part 91 Antenna 92 Circulator 93 Wireless reception part 94 Wireless transmission part 95 Signal processing part 96 Reception signal processing unit 97 Transmission signal processing unit 98 Control unit 101 Radio base station apparatus (communication control apparatus)
161 S-GW
162 MME
163 P-GW
202 wireless terminal device 301 core network 302 IP network

Claims (29)

  1.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、
     自己の無線端末装置の前記移動動作の実行回数をカウントするためのカウント部と、
     前記カウント部によってカウントされた前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部とを備え、
     前記カウント部は、前記無線基地局装置から取得したカウント基準に従って前記カウントを行う、無線端末装置。
    A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    A counting unit for counting the number of times the mobile terminal performs the moving operation;
    A movement state estimation unit for estimating a movement state of the wireless terminal device based on the number of executions counted by the counting unit;
    The said counting part is a radio | wireless terminal apparatus which performs the said count according to the count reference | standard acquired from the said radio base station apparatus.
  2.  前記カウント部は、実行された自己の無線端末装置の前記移動動作を前記カウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、請求項1に記載の無線端末装置。 The wireless terminal device according to claim 1, wherein the counting unit weights the movement operation of the executed wireless terminal device according to the count reference, and performs the counting using a weighted value.
  3.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、
     自己の無線端末装置の前記移動動作の実行回数をカウントするためのカウント部と、
     前記カウント部によってカウントされた前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部とを備え、
     前記カウント部は、実行された自己の無線端末装置の前記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、無線端末装置。
    A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    A counting unit for counting the number of times the mobile terminal performs the moving operation;
    A movement state estimation unit for estimating a movement state of the wireless terminal device based on the number of executions counted by the counting unit;
    The said counting part is a radio | wireless terminal apparatus which weights the said movement operation | movement of the own radio | wireless terminal apparatus performed according to the predetermined | prescribed count reference | standard, and performs the said count using the weighted value.
  4.  前記カウント部は、実行された自己の無線端末装置の前記移動動作が、前記カウント基準に従う所定条件を満たす場合には、前記所定条件を満たす前記移動動作を前記カウントの対象から除外する、請求項1から請求項3のいずれか1項に記載の無線端末装置。 The counting unit excludes the moving operation satisfying the predetermined condition from the target of counting when the moving operation of the executed wireless terminal device satisfies a predetermined condition according to the count criterion. The radio | wireless terminal apparatus of any one of Claims 1-3.
  5.  前記カウント部は、自己の無線端末装置のハンドオーバ動作におけるハンドオーバ元の無線基地局装置から受信したハンドオーバコマンドに含まれるカウント基準を取得する、請求項1または請求項2に記載の無線端末装置。 The radio terminal apparatus according to claim 1 or 2, wherein the count unit acquires a count reference included in a handover command received from a handover source radio base station apparatus in a handover operation of the own radio terminal apparatus.
  6.  前記無線端末装置は、さらに、
     前記移動状態推定部によって推定された前記移動状態に基づいて、自己の無線端末装置の前記移動動作の実行判断に関わる自己の無線端末装置の設定を行うための設定部を備える、請求項1から請求項5のいずれか1項に記載の無線端末装置。
    The wireless terminal device further includes:
    The apparatus includes a setting unit configured to perform setting of the wireless terminal device related to execution determination of the moving operation of the wireless terminal device based on the movement state estimated by the moving state estimation unit. The wireless terminal device according to claim 5.
  7.  前記無線端末装置は、さらに、
     前記移動状態推定部によって推定された前記移動状態を、前記無線基地局装置へ通知するための通知部を備える、請求項1から請求項6のいずれか1項に記載の無線端末装置。
    The wireless terminal device further includes:
    The radio | wireless terminal apparatus of any one of Claims 1-6 provided with the notification part for notifying the said movement state estimated by the said movement state estimation part to the said radio base station apparatus.
  8.  前記設定部は、前記移動状態に基づいて、自己の無線端末装置のハンドオーバ動作の実行判断に関わる自己の無線端末装置の動作に関する設定を行う、請求項6に記載の無線端末装置。 The wireless terminal apparatus according to claim 6, wherein the setting unit performs setting related to an operation of the wireless terminal apparatus related to execution determination of a handover operation of the wireless terminal apparatus based on the movement state.
  9.  前記カウント部は、前記無線基地局装置から取得した情報に基づいて、前記所定条件を満たすか否かを判断する、請求項4に記載の無線端末装置。 The radio terminal apparatus according to claim 4, wherein the count unit determines whether or not the predetermined condition is satisfied based on information acquired from the radio base station apparatus.
  10.  前記無線端末装置は、さらに、
     移動動作における移動元または移動先の無線基地局装置から送信される無線信号の送信電力に基づいて、前記移動動作における移動元または移動先の無線基地局装置の種別を判定するための基地局種別判定部を備え、
     前記カウント部は、前記基地局種別判定部の判定結果に基づいて、前記移動動作を前記カウントの対象とするか否かを判断する、請求項1から請求項9のいずれか1項に記載の無線端末装置。
    The wireless terminal device further includes:
    Base station type for determining the type of the source or destination radio base station apparatus in the moving operation based on the transmission power of the radio signal transmitted from the source or destination radio base station apparatus in the moving operation It has a judgment part,
    The counting unit according to any one of claims 1 to 9, wherein the counting unit determines whether or not the movement operation is to be counted based on a determination result of the base station type determining unit. Wireless terminal device.
  11.  前記カウント部は、自己の無線端末装置の無線基地局装置への移動動作が行われてから他の無線基地局装置への移動動作が行われるまでの滞在時間が所定のしきい値未満の場合に、前記移動動作を前記カウントの対象から除外する、請求項1から請求項10のいずれか1項に記載の無線端末装置。 The counting unit is configured so that a stay time from when the movement operation of the wireless terminal device to the wireless base station device is performed until the movement operation to another wireless base station device is performed is less than a predetermined threshold value The radio terminal apparatus according to claim 1, wherein the moving operation is excluded from the count target.
  12.  前記カウント部は、自己の無線端末装置の他の無線基地局装置から小型基地局への移動動作が行われた場合に、前記移動動作を前記カウントの対象から除外する、請求項1から請求項11のいずれか1項に記載の無線端末装置。 The said counting part excludes the said movement operation | movement from the object of the said count, when the movement operation | movement from the other radio base station apparatus of a self radio | wireless terminal apparatus to a small base station is performed. 11. The wireless terminal device according to any one of 11.
  13.  前記カウント部は、自己の無線端末装置の小型基地局から他の無線基地局装置への移動動作が行われた場合に、前記移動動作を前記カウントの対象から除外する、請求項1から請求項12のいずれか1項に記載の無線端末装置。 The said counting part excludes the said movement operation | movement from the object of the said count, when the movement operation | movement from the small base station of another radio | wireless terminal apparatus to another wireless base station apparatus is performed. The wireless terminal device according to any one of 12.
  14.  前記カウント部は、自己の無線端末装置のマクロ基地局から他の無線基地局装置への移動動作または他の無線基地局装置からマクロ基地局への移動動作が行われた場合に、前記移動動作を前記カウントの対象とする、請求項1から請求項13のいずれか1項に記載の無線端末装置。 The counting unit performs the moving operation when a moving operation of the wireless terminal device of the wireless terminal device from the macro base station to another wireless base station device or a moving operation from another wireless base station device to the macro base station is performed. The wireless terminal device according to any one of claims 1 to 13, wherein the target of counting is.
  15.  ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、
     自己の無線端末装置の前記ハンドオーバ動作の実行回数をカウントするためのカウント部と、
     前記カウント部によってカウントされた前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部と、
     前記移動状態推定部によって推定された前記移動状態に基づいて、TTT(Time to Trigger)の値を設定するための設定部と、
     前記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が前記TTTで示される時間継続して所定条件を満たす場合に、前記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するための受信電力報告部とを備え、
     前記カウント部は、前記無線基地局装置から取得したカウント基準に従って前記カウントを行う、無線端末装置。
    A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
    A counting unit for counting the number of times the handover operation of the wireless terminal device is executed;
    Based on the number of executions counted by the counting unit, a movement state estimation unit for estimating the movement state of its own wireless terminal device,
    A setting unit for setting a value of TTT (Time to Trigger) based on the movement state estimated by the movement state estimation unit;
    When the reception power of the radio signal transmitted from the radio base station apparatus is measured, and the measurement result continues for the time indicated by the TTT and the predetermined condition is satisfied, a measurement report indicating the measurement result is transmitted to the communication destination radio A reception power report unit for transmitting to the base station device,
    The said counting part is a radio | wireless terminal apparatus which performs the said count according to the count reference | standard acquired from the said radio base station apparatus.
  16.  ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置であって、
     自己の無線端末装置の前記ハンドオーバ動作の実行回数をカウントするためのカウント部と、
     前記カウント部によってカウントされた前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するための移動状態推定部と、
     前記移動状態推定部によって推定された前記移動状態に基づいて、TTTの値を設定するための設定部と、
     前記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が前記TTTで示される時間継続して所定条件を満たす場合に、前記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するための受信電力報告部とを備え、
     前記カウント部は、実行された自己の無線端末装置の前記ハンドオーバ動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、無線端末装置。
    A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
    A counting unit for counting the number of times the handover operation of the wireless terminal device is executed;
    Based on the number of executions counted by the counting unit, a movement state estimation unit for estimating the movement state of its own wireless terminal device,
    A setting unit for setting a value of TTT based on the movement state estimated by the movement state estimation unit;
    When the reception power of the radio signal transmitted from the radio base station apparatus is measured, and the measurement result continues for the time indicated by the TTT and the predetermined condition is satisfied, a measurement report indicating the measurement result is transmitted to the communication destination radio A reception power report unit for transmitting to the base station device,
    The said counting part is a radio | wireless terminal apparatus which weights the said handover operation | movement of the own radio | wireless terminal apparatus performed according to the predetermined | prescribed count reference | standard, and performs the said count using the weighted value.
  17.  移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って前記移動動作の実行回数をカウントする無線端末装置について、前記カウント基準を作成するためのカウント基準作成部と、
     前記カウント基準作成部によって作成された前記カウント基準を他の装置に通知するためのカウント基準通知部とを備える、通信制御装置。
    For a wireless terminal device that can communicate with a plurality of wireless base station devices by performing a moving operation, and counts the number of executions of the moving operation according to a counting reference, a count reference creating unit for creating the counting reference;
    A communication control device comprising: a count reference notification unit for notifying another device of the count reference created by the count reference creation unit.
  18.  前記カウント基準作成部は、各前記無線基地局装置を重み付けし、
     前記カウント基準通知部は、前記カウント基準作成部による重み付け結果を前記カウント基準として通知する、請求項17に記載の通信制御装置。
    The count reference creation unit weights each of the radio base station devices,
    The communication control device according to claim 17, wherein the count reference notification unit notifies a weighting result by the count reference creation unit as the count reference.
  19.  前記カウント基準通知部は、前記カウント基準作成部による重み付け結果を前記各無線基地局装置に通知する、請求項18に記載の通信制御装置。 The communication control device according to claim 18, wherein the count reference notification unit notifies each radio base station device of a weighting result by the count reference creation unit.
  20.  請求項17に記載の通信制御装置を備える無線基地局装置。 A radio base station apparatus comprising the communication control apparatus according to claim 17.
  21.  前記無線基地局装置を管理し、請求項17に記載の通信制御装置を備える管理装置。 A management apparatus that manages the radio base station apparatus and includes the communication control apparatus according to claim 17.
  22.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、
     自己の無線端末装置の前記移動動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを含み、
     前記カウントするステップにおいては、前記無線基地局装置から取得したカウント基準に従って前記カウントを行う、通信制御方法。
    A communication control method in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    Counting the number of executions of the moving operation of its own wireless terminal device;
    Based on the counted number of executions, and estimating the movement state of its own wireless terminal device,
    The communication control method, wherein in the counting step, the counting is performed according to a count standard acquired from the radio base station apparatus.
  23.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、
     自己の無線端末装置の前記移動動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを含み、
     前記カウントするステップにおいては、実行された自己の無線端末装置の前記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、通信制御方法。
    A communication control method in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    Counting the number of executions of the moving operation of its own wireless terminal device;
    Based on the counted number of executions, and estimating the movement state of its own wireless terminal device,
    The communication control method, wherein in the counting step, the performed movement operation of the own wireless terminal device is weighted according to a predetermined count standard, and the counting is performed using a weighted value.
  24.  ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、
     自己の無線端末装置の前記ハンドオーバ動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップと、
     推定した前記移動状態に基づいて、TTTの値を設定するステップと、
     前記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が前記TTTで示される時間継続して所定条件を満たす場合に、前記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するステップとを含み、
     前記カウントするステップにおいては、前記無線基地局装置から取得したカウント基準に従って前記カウントを行う、通信制御方法。
    A communication control method in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
    Counting the number of times the handover operation of the wireless terminal device is executed;
    Based on the counted number of executions, estimating the movement state of its own wireless terminal device;
    Setting a value of TTT based on the estimated movement state;
    When the reception power of the radio signal transmitted from the radio base station apparatus is measured, and the measurement result continues for the time indicated by the TTT and the predetermined condition is satisfied, a measurement report indicating the measurement result is transmitted to the communication destination radio Transmitting to the base station device,
    In the counting step, a communication control method for performing the counting in accordance with a counting standard acquired from the radio base station apparatus.
  25.  ハンドオーバ動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置における通信制御方法であって、
     自己の無線端末装置の前記ハンドオーバ動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップと、
     推定した前記移動状態に基づいて、TTTの値を設定するステップと、
     前記無線基地局装置から送信される無線信号の受信電力を測定し、測定結果が前記TTTで示される時間継続して所定条件を満たす場合に、前記測定結果を示すメジャメントレポートを通信接続先の無線基地局装置へ送信するステップとを含み、
     前記カウントするステップにおいては、実行された自己の無線端末装置の前記ハンドオーバ動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、通信制御方法。
    A communication control method in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
    Counting the number of times the handover operation of the wireless terminal device is executed;
    Based on the counted number of executions, estimating the movement state of its own wireless terminal device;
    Setting a value of TTT based on the estimated movement state;
    When the reception power of the radio signal transmitted from the radio base station apparatus is measured, and the measurement result continues for the time indicated by the TTT and the predetermined condition is satisfied, a measurement report indicating the measurement result is transmitted to the communication destination radio Transmitting to the base station device,
    The communication control method, wherein in the counting step, the executed handover operation of the own wireless terminal device is weighted according to a predetermined count standard, and the counting is performed using a weighted value.
  26.  通信制御装置における通信制御方法であって、
     移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って前記移動動作の実行回数をカウントする無線端末装置について、前記カウント基準を作成するステップと、
     作成した前記カウント基準を他の装置に通知するステップとを含む、通信制御方法。
    A communication control method in a communication control device,
    For the wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation and counting the number of executions of the moving operation according to the counting criterion, creating the count reference;
    And notifying other devices of the created count reference.
  27.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置において用いられる通信制御プログラムであって、コンピュータに、
     自己の無線端末装置の前記移動動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを実行させるためのプログラムであり、
     前記カウントするステップにおいては、前記無線基地局装置から取得したカウント基準に従って前記カウントを行う、通信制御プログラム。
    A communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    Counting the number of executions of the moving operation of its own wireless terminal device;
    A program for executing a step of estimating a movement state of the wireless terminal device based on the counted number of executions,
    In the counting step, a communication control program for performing the counting in accordance with a counting standard acquired from the radio base station apparatus.
  28.  移動動作を行なうことにより複数の無線基地局装置と通信可能な無線端末装置において用いられる通信制御プログラムであって、コンピュータに、
     自己の無線端末装置の前記移動動作の実行回数をカウントするステップと、
     カウントした前記実行回数に基づいて、自己の無線端末装置の移動状態を推定するステップとを実行させるためのプログラムであり、
     前記カウントするステップにおいては、実行された自己の無線端末装置の前記移動動作を所定のカウント基準に従って重み付けし、重み付けした値を用いて前記カウントを行う、通信制御プログラム。
    A communication control program used in a wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation,
    Counting the number of executions of the moving operation of its own wireless terminal device;
    A program for executing a step of estimating a movement state of the wireless terminal device based on the counted number of executions,
    In the counting step, a communication control program that weights the movement operation of the executed wireless terminal device according to a predetermined count standard and performs the counting using a weighted value.
  29.  通信制御装置において用いられる通信制御プログラムであって、コンピュータに、
     移動動作を行なうことにより複数の無線基地局装置と通信可能であり、かつカウント基準に従って前記移動動作の実行回数をカウントする無線端末装置について、前記カウント基準を作成するステップと、
     作成した前記カウント基準を他の装置に通知するステップとを実行させるための、通信制御プログラム。
    A communication control program used in a communication control apparatus,
    For the wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a moving operation and counting the number of executions of the moving operation according to the counting criterion, creating the count reference;
    A communication control program for executing a step of notifying another device of the created count reference.
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