WO2019187163A1 - Communication control device, wireless device, and wireless communication system - Google Patents

Communication control device, wireless device, and wireless communication system Download PDF

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Publication number
WO2019187163A1
WO2019187163A1 PCT/JP2018/014011 JP2018014011W WO2019187163A1 WO 2019187163 A1 WO2019187163 A1 WO 2019187163A1 JP 2018014011 W JP2018014011 W JP 2018014011W WO 2019187163 A1 WO2019187163 A1 WO 2019187163A1
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WO
WIPO (PCT)
Prior art keywords
communication
base station
unit
communication control
terminal device
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PCT/JP2018/014011
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French (fr)
Japanese (ja)
Inventor
喬裕 向田
彰 島元
大出　高義
Original Assignee
富士通株式会社
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Priority to PCT/JP2018/014011 priority Critical patent/WO2019187163A1/en
Publication of WO2019187163A1 publication Critical patent/WO2019187163A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a communication control device, a wireless device, and a wireless communication system.
  • 5G is classified into eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications). Support for many use cases is envisioned.
  • eMBB Enhanced Mobile BroadBand
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communications
  • HetNet Heterogenious Network
  • CA Carrier Aggregation
  • DC Dual Connectivity
  • base stations such as macro cells and small cells may become congested.
  • the DC is rejected even if the base station requests DC from the adjacent base station. Therefore, the base station requests DC from a plurality of neighboring base stations in order to find a neighboring base station that accepts the DC. As a result, it takes time until the DC is established, and it is difficult to increase the transmission speed.
  • the disclosed technology has been made in view of the above, and an object thereof is to provide a communication control device, a wireless device, and a wireless communication system that can establish DC more quickly.
  • the communication control device disclosed in the present application includes, in one aspect, a wireless communication control unit, a transmission unit, a reception unit, and a selection unit.
  • the wireless communication control unit controls communication with the terminal device using the first radio frequency, or controls communication with the terminal device via the connected wireless device.
  • a transmission part transmits the signal which requests
  • the receiving unit receives a signal including control information from another communication control device.
  • the selection unit selects one communication control device that communicates with the terminal device using the second radio frequency from another communication control device.
  • the transmission unit transmits a control signal including information related to communication with the terminal device using the second radio frequency to one communication control device.
  • the communication control device the wireless device, and the wireless communication system disclosed in the present application, it is possible to establish DC more quickly.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system according to the first embodiment.
  • FIG. 2 is a block diagram illustrating an example of a base station that functions as a master base station in the first embodiment.
  • FIG. 3 is a diagram illustrating an example of base station information according to the first embodiment.
  • FIG. 4 is a block diagram illustrating an example of a base station that functions as a secondary base station in the first embodiment.
  • FIG. 5 is a block diagram illustrating an example of a terminal device.
  • FIG. 6 is a diagram illustrating an example of data included in an MR (Measurement Report).
  • FIG. 7 is a diagram illustrating an example of processing of the wireless communication system according to the first embodiment.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system according to the first embodiment.
  • FIG. 2 is a block diagram illustrating an example of a base station that functions as a master base station in the first embodiment.
  • FIG. 3 is a diagram illustrating an example
  • FIG. 8 is a block diagram illustrating an example of a base station that functions as a master base station in the second embodiment.
  • FIG. 9 is a block diagram illustrating an example of a base station that functions as a secondary base station in the second embodiment.
  • FIG. 10 is a diagram illustrating an example of processing of the wireless communication system according to the second embodiment.
  • FIG. 11 is a block diagram illustrating an example of a base station that functions as a master base station in the third embodiment.
  • FIG. 12 is a diagram illustrating an example of processing of the wireless communication system according to the third embodiment.
  • FIG. 13 is a diagram illustrating an example of a wireless communication system according to the fourth embodiment.
  • FIG. 14 is a block diagram illustrating an example of a base station that functions as a master base station in the fourth embodiment.
  • FIG. 14 is a block diagram illustrating an example of a base station that functions as a master base station in the fourth embodiment.
  • FIG. 15 is a diagram illustrating an example of base station information according to the fourth embodiment.
  • FIG. 16 is a block diagram illustrating an example of a base station that functions as a secondary base station in the fourth embodiment.
  • FIG. 17 is a diagram illustrating an example of data included in the resource information in the fourth embodiment.
  • FIG. 18 is a diagram illustrating an example of processing of the wireless communication system according to the fourth embodiment.
  • FIG. 19 is a diagram illustrating an example of a wireless communication system according to the fifth embodiment.
  • FIG. 20 is a block diagram illustrating an example of a CU-CP according to the fifth embodiment.
  • FIG. 21 is a diagram illustrating an example of base station information according to the fifth embodiment.
  • FIG. 22 is a diagram illustrating an example of data included in resource information in the fifth embodiment.
  • FIG. 23 is a block diagram illustrating an example of a CU-UP according to the fifth embodiment.
  • FIG. 24 is a diagram illustrating an example of processing of the wireless communication system according to the fifth embodiment.
  • FIG. 25 is a block diagram illustrating an example of a CU-CP according to the sixth embodiment.
  • FIG. 26 is a diagram illustrating an example of processing of the wireless communication system according to the sixth embodiment.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system 10 according to the first embodiment.
  • the wireless communication system 10 includes a plurality of base stations 20 (20-1, 20-2,...) And a terminal device 30.
  • the base station 20-1 forms a cell 200-1
  • the base station 20-2 forms a cell 200-2.
  • a plurality of base stations 20-1, 20-2,... .. Are collectively referred to as the cell 200 without being distinguished from each other.
  • Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11.
  • Each base station 20 is an example of a communication control device.
  • the terminal device 30 can perform wireless communication by DC (Dual Connectivity) between the two base stations 20.
  • DC refers to wireless communication performed using the first radio frequency with one of the two base stations 20 and the first radio frequency with the other base station 20. This is wireless communication in which wireless communication performed using different wireless frequencies is performed simultaneously.
  • one of the two base stations 20 that performs DC with the terminal device 30 is described as a base station 20m that functions as a main base station in DC, and the other is a base station 20s that functions as a secondary base station in DC. It describes.
  • FIG. 2 is a block diagram illustrating an example of the base station 20m that functions as a master base station in the first embodiment.
  • the base station 20 m includes a communication unit 210, a control unit 211, a memory 212, a radio unit 213, and an antenna 214.
  • the base station 20m has a control device such as a BBU (Base Band Unit) and a radio device such as an RRH (Remote Radio Head), and the communication unit 210, the control unit 211, and the memory 212 are provided in the BBU.
  • the radio unit 213 may be provided in the RRH.
  • the communication unit 210 is realized by, for example, a NIC (Network Interface Card) or the like, and transmits and receives signals to and from the core network 11.
  • the communication unit 210 is an example of a transmission unit, a reception unit, and a transmission / reception unit.
  • base station information 2120 is stored in the memory 212.
  • various programs executed by the control unit 211 are stored in the memory 212.
  • the control unit 211 includes a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), for example, and implements each function of the control unit 211 by executing a program read from the memory 212.
  • the radio unit 213 transmits a radio signal via the antenna 214 to form the cell 200 in a range where the radio signal reaches. Further, the radio unit 213 performs, for example, physical layer processing on the signal output from the control unit 211 and the signal received via the antenna 214. For example, the wireless unit 213 converts the signal output from the control unit 211 from a digital signal to an analog signal. The radio unit 213 performs processing such as up-conversion, amplification, and filtering on the converted signal, and radiates the processed signal to the space via the antenna 214. The radio unit 213 performs processing such as filtering, amplification, and down-conversion on the signal received via the antenna 214. The wireless unit 213 converts the processed signal from an analog signal to a digital signal and outputs the converted signal to the control unit 211.
  • a program or data is stored in a portable recording medium such as a memory card inserted into the base station 20m, and the base station 20m appropriately acquires and executes the program or data from such a portable recording medium. It may be. Further, the base station 20m appropriately acquires and executes the program etc. from another computer or server device storing the program, data, etc. via a wireless communication line, public line, Internet, LAN, WAN, etc. It may be.
  • base station information 2120 as shown in FIG. 3 is stored.
  • FIG. 3 is a diagram illustrating an example of the base station information 2120.
  • a base station ID and access information are stored in association with a cell ID for identifying each cell 200.
  • the base station ID is information for identifying each base station 20.
  • the access information is information for accessing the base station 20 identified by the corresponding base station ID, such as address information.
  • the base station information 2120 is stored in the memory 212 in advance by an administrator of the base station 20 or the like.
  • the control unit 211 executes a program read from the memory 212, thereby executing a DC execution determination unit 2110, a request unit 2111, a collection unit 2112, a DC availability determination unit 2113, a selection unit 2114, a DC processing unit 2115, and wireless communication control. Each function of the unit 2116 is realized.
  • the DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC.
  • the DC execution determination unit 2110 determines whether or not to perform communication with the terminal device 30 by DC based on, for example, the state of the resource of the base station 20m.
  • the resource state includes, for example, the free capacity of the buffer and the capacity of the interface with the core network 11.
  • the resource state may include the traffic volume of communication performed with the terminal device 30, the usage rate of the processor, the usage rate of the memory 212, or the like.
  • the DC execution determination unit 2110 creates an MR request for requesting MR (Measurement Report) to the terminal device 30 when it is determined that communication with the terminal device 30 is executed by DC. Then, the DC execution determining unit 2110 transmits the created MR request to the terminal device 30 via the wireless unit 213.
  • the terminal device 30 that has received the MR request measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. And the terminal device 30 transmits MR containing the quality information which shows the quality of the signal for every surrounding cell 200 to the base station 20m.
  • the request unit 2111 When the request unit 2111 receives an MR from the terminal device 30 via the radio unit 213, the request unit 2111 requests resource information including information indicating the state of the resource based on the quality information for each cell 200 included in the MR. One or more other base stations 20 to which the request is transmitted are specified. Then, the request unit 2111 transmits a resource information request to the other identified base station 20 via the communication unit 210 and the core network 11.
  • the resource information request is transmitted by multicast, for example.
  • the request unit 2111 identifies, for example, another base station 20 that manages each of the cells 200 as the base station 20 that is the transmission destination of the resource information request for a predetermined number of cells 200 in order of good signal quality.
  • the request unit 2111 specifies another base station 20 that manages each cell 200 as the base station 20 that is the transmission destination of the resource information request. Also good.
  • the other base station 20 that has received the resource information request from the request unit 2111 collects information indicating the state of the resource of the own device, and sends the resource information including the collected information to the base station 20m via the core network 11.
  • the resource information is the state of the resource that the base station 20 has, and is, for example, the free capacity of the buffer and the capacity of the interface with the core network 11.
  • the resource information may include a processor usage rate or a memory usage rate.
  • the resource information may be radio resource information.
  • the collection unit 2112 collects resource information transmitted from other base stations 20 via the communication unit 210 and the core network 11.
  • the DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
  • the selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each of the other base stations 20 before DC is requested of the other base station 20. Based on the DC information of each of the other base stations 20 output from the DC availability determination unit 2113, the selection unit 2114 includes the other base stations 20 corresponding to the DC information indicating that DC is possible. The other base station 20 that requests DC is selected. For example, the selection unit 2114 requests other base stations 20 that manage the cell 200 with good signal quality from other base stations 20 corresponding to DC information indicating that DC is possible. The base station 20 is preferentially selected. Then, the selection unit 2114 outputs information on the selected other base station 20 to the DC processing unit 2115.
  • the DC processing unit 2115 transmits a DC request, which is a control signal for requesting DC, to the other base station 20 selected by the selection unit 2114 via the communication unit 210 and the core network 11. Then, the DC processing unit 2115 performs wireless communication with the terminal device 30 through DC in cooperation with the other base station 20 selected by the selection unit 2114.
  • the DC processing unit 2115 is an example of a control unit.
  • the wireless communication control unit 2116 controls a protocol for wireless communication with the terminal device 30 via the wireless unit 213.
  • the radio communication control unit 2116 executes, for example, RRC layer, PDCP layer, RLC layer, and MAC layer processing.
  • RRC is an abbreviation for Radio Resource Control
  • PDCP is an abbreviation for Packet Data Convergence Protocol
  • RLC is an abbreviation for Radio Link Control
  • MAC is an abbreviation for Media Access Control.
  • FIG. 4 is a block diagram illustrating an example of a base station 20s that functions as a secondary base station in the first embodiment.
  • the base station 20 s includes a communication unit 210, a control unit 211, a memory 212, a radio unit 213, and an antenna 214.
  • blocks with the same reference numerals as those in FIG. 2 are the same as the blocks described in FIG.
  • the DC processing unit 2115 performs wireless communication with the terminal device 30 by DC in cooperation with the base station 20m.
  • the resource management unit 2117 manages the state of resources in the base station 20s.
  • the resource management unit 2117 receives a resource information request from the base station 20 m via the core network 11 and the communication unit 210, the resource management unit 2117 transmits the resource information of the base station 20 s to the base station via the communication unit 210 and the core network 11. Send to 20m.
  • the base station 20m that functions as a master base station and the base station 20s that functions as a secondary base station are described as separate devices, but the base station 20m and the base station 20s are the same.
  • the base station 20 may be configured. The same applies to the second and subsequent embodiments.
  • FIG. 5 is a block diagram illustrating an example of the terminal device 30.
  • the terminal device 30 includes an antenna 31, a radio unit 32, a control unit 33, and a memory 34.
  • the radio unit 32 executes, for example, physical layer processing on the signal received from the base station 20 via the antenna 31 and the signal output from the control unit 33. For example, the radio unit 32 performs processing such as filtering, amplification, and down-conversion on a signal received from the base station 20 via the antenna 31.
  • the wireless unit 32 converts the processed signal from an analog signal to a digital signal and outputs the converted signal to the control unit 33.
  • the radio unit 32 converts the signal output from the control unit 33 from a digital signal to an analog signal. Then, the radio unit 32 performs processes such as up-conversion, amplification, and filtering on the converted signal, and transmits the processed transmission signal to the base station 20 via the antenna 31.
  • control unit 33 In the memory 34, various programs and data executed by the control unit 33 are stored.
  • the control unit 33 has a processor such as a CPU or a DSP, for example, and implements each function of the control unit 33 by executing a program read from the memory 34.
  • a program, data, or the like is stored in a portable recording medium such as a memory card inserted into the terminal device 30, and the terminal device 30 appropriately acquires the program, data, etc. from such a portable recording medium and executes it. It may be.
  • the terminal device 30 appropriately acquires and executes the program or the like from another computer or server device that stores the program or data through a wireless communication line, a public line, the Internet, a LAN, a WAN, or the like. It may be.
  • the control unit 33 implements the functions of the measurement unit 330, the MR processing unit 331, the DC processing unit 332, and the wireless communication control unit 333 by executing the program read from the memory 34.
  • the measuring unit 330 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200.
  • the MR processing unit 331 When the MR processing unit 331 receives an MR request from the base station 20 via the wireless unit 32, the MR processing unit 331 acquires quality information indicating the signal quality for each cell 200 from the measurement unit 330. Then, the MR processing unit 331 creates an MR including quality information for each cell 200 and transmits the created MR to the base station 20 via the radio unit 32.
  • FIG. 6 is a diagram illustrating an example of data included in the MR 40.
  • the quality information of the signal transmitted from the base station 20 in each cell 200 is associated with a cell ID that identifies the cell 200.
  • the signal quality information is, for example, RSRP (Reference Signal Received Power), RSSI (Received Signal Strength Indicator), or RSRQ (Reference Signal Received Quality).
  • the signal quality information is an example of radio channel quality.
  • the DC processing unit 332 performs wireless communication by DC between the base station 20m and the base station 20s.
  • the wireless communication control unit 333 controls a protocol for wireless communication with the base station 20 via the wireless unit 32.
  • the radio communication control unit 333 performs processing of the RRC layer, the PDCP layer, the RLC layer, and the MAC layer.
  • FIG. 7 is a diagram illustrating an example of processing of the wireless communication system 10 according to the first embodiment.
  • a radio communication system 10 including one terminal device 30, one base station 20m functioning as a master base station, and n base stations 20s functioning as secondary base station candidates is assumed. Has been.
  • the base station 20m functioning as a master base station determines whether or not to communicate with the terminal device 30 by DC based on the resource status of the base station 20m, and the DC communicates with the terminal device 30. It is determined to execute communication (S100). Then, the base station 20m transmits an MR request to the terminal device 30 using a radio signal (S101).
  • the terminal device 30 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. And the terminal device 30 produces MR containing the quality information which shows the quality of the signal for every surrounding cell 200, and transmits produced MR to the base station 20m (S102).
  • the base station 20m When the base station 20m receives the MR from the terminal device 30, the base station 20m specifies one or more base stations 20s as the transmission destination of the resource information request based on the quality information for each cell 200 included in the MR (S103). Then, the base station 20m transmits a resource information request to the identified base station 20s via the core network 11 (S104).
  • the resource information request is transmitted by multicast, for example.
  • each base station 20s When each base station 20s receives a resource information request from the base station 20m via the core network 11, the base station 20s transmits the resource information of the base station 20s to the base station 20m via the core network 11 (S105-1 to S105-1). 105-n).
  • the base station 20m collects resource information transmitted from the base station 20s via the core network 11. Then, the base station 20m determines whether DC is possible for each base station 20s based on the collected resource information (S106).
  • the base station 20m selects a base station 20s that is a transmission destination of a DC request, which is a control signal for requesting DC, from the base stations 20s capable of DC (S107).
  • the base station 20m selects, for example, the base station 20s that manages the cell 200 having the best signal quality as the base station 20s that requests DC from among the base stations 20s that can perform DC.
  • the base station 20s-1 is the base station 20s having the best signal quality among the base stations 20s capable of DC.
  • the base station 20m transmits the DC request to the base station 20s (for example, the base station 20s-1) selected in step S107 via the core network 11 (S108).
  • the base station 20s-1 that has received the DC request transmits an ACK (ACKnowledgement) indicating acceptance of the DC request to the base station 20m via the core network 11.
  • the base station 20m and the base station 20s-1 cooperate to execute wireless communication with the terminal device 30 by DC.
  • the base station 20m of this embodiment includes the selection unit 2114 and the DC processing unit 2115.
  • the selection unit 2114 obtains DC information indicating whether or not DC is possible for each of the plurality of base stations 20s before requesting the DC to the base station 20s. Then, the selection unit 2114 selects the base station 20s that requests DC from the base stations 20s corresponding to DC information indicating that DC is possible.
  • the DC processing unit 2115 transmits a control signal requesting DC to the base station 20s selected by the selection unit 2114.
  • the base station 20m transmits a DC request to the base station 20s regardless of whether or not DC is possible, the DC request may be rejected depending on the resource state of the base station 20s. is there.
  • the base station 20m transmits the DC request to the other base station 20s in order to find the base station 20s that accepts the DC. If the rejection of the DC request is repeated, it takes time until the DC is established, and it is difficult to increase the transmission speed of wireless communication with the terminal device 30.
  • the base station 20 of the present embodiment identifies the other base stations 20 capable of DC for each of the other base stations 20. Then, the base station 20 selects another base station 20 that requests DC from among the other base stations 20 capable of DC. Thereby, the base station 20 of a present Example can raise possibility that a DC request
  • the selection unit 2114 receives the data transmitted by the DC among the other base stations 20 corresponding to the DC information indicating that the DC is possible.
  • the other base station 20 that manages a cell with a good signal quality measured by the device 30 is preferentially selected as another base station 20 that requests DC.
  • the base station 20 of a present Example can provide the radio
  • the base station 20 in the first embodiment includes the collection unit 2112 and the DC availability determination unit 2113.
  • the collection unit 2112 collects resource information indicating the state of the resources of the other base stations 20 from each of the other base stations 20.
  • the DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information, and outputs DC information indicating the determination result to the selection unit 2114. Thereby, the selection unit 2114 can acquire DC information indicating whether or not DC is possible for each of the plurality of base stations 20s.
  • the base station 20 in the first embodiment described above includes a request unit 2111.
  • the request unit 2111 requests resource information from other base stations 20 that manage each cell 200 for a predetermined number of cells 200 in order of good signal quality measured by the terminal device 30.
  • the base station 20 of the present embodiment can provide more stable wireless communication by DC in cooperation with other base stations 20, and can suppress communication traffic due to transmission of resource information. .
  • the request unit 2111 transmits, for example, a cell 200 whose signal quality measured by the terminal device 30 is better than a predetermined quality to other base stations 20 that manage each cell 200. Resource information may be requested.
  • the base station 20 of the present embodiment can provide more stable wireless communication by DC in cooperation with other base stations 20, and can suppress communication traffic due to transmission of resource information. .
  • Example 1 the base station 20m that functions as a master base station determines whether or not DC is possible for each base station 20s based on the resource information collected from the base station 20s that functions as a candidate for a secondary base station.
  • each base station 20s determines whether or not DC is possible, and the base station 20m selects the base station 20s that requests DC based on the determination result by each base station 20s.
  • the configuration of the wireless communication system 10 is the same as that of the wireless communication system 10 according to the first embodiment described with reference to FIG.
  • FIG. 8 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the second embodiment. Except for the points described below, in FIG. 8, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG.
  • the control unit 211 of the base station 20m in the second embodiment executes a program read from the memory 212, thereby executing a DC execution determination unit 2110, a request unit 2111, a selection unit 2114, a DC processing unit 2115, and a wireless communication control unit. Each function of 2116 is realized.
  • the request unit 2111 When the request unit 2111 receives an MR from the terminal device 30 via the radio unit 213, the request unit 2111 requests another base station that determines whether or not DC is possible based on the quality information for each cell 200 included in the MR. One or more 20 are specified.
  • the request unit 2111 transmits a DC determination request for requesting determination of whether or not DC is possible, to the identified base station 20 via the communication unit 210 and the core network 11.
  • the DC determination request includes information related to communication traffic shared with the base station 20m by DC.
  • the DC determination request is transmitted by multicast, for example.
  • the selection unit 2114 acquires DC information indicating whether or not DC is possible from each of the other base stations 20.
  • the DC information is acquired from each other base station 20 before DC is requested to the other base station 20.
  • the selection unit 2114 requests DC from the other base stations 20 corresponding to the DC information indicating that DC is possible based on the acquired DC information of each other base station 20. Another base station 20 is selected.
  • FIG. 9 is a block diagram illustrating an example of a base station 20s that functions as a secondary base station in the second embodiment. Except for the points described below, in FIG. 9, blocks denoted by the same reference numerals as those in FIG. 4 have the same or similar functions as the blocks in FIG.
  • the control unit 211 of the base station 20 s in the second embodiment executes each program of the DC availability determination unit 2113, the DC processing unit 2115, the wireless communication control unit 2116, and the resource management unit 2117 by executing the program read from the memory 212. Realize the function.
  • the DC availability determination unit 2113 determines whether or not DC is possible based on the state of the resource in the own device. Then, the DC availability determination unit 2113 transmits DC information indicating the determination result to the base station 20m via the communication unit 210 and the core network 11.
  • the DC information may include information indicating availability of each resource in addition to information indicating whether or not DC is possible.
  • the base station 20m that has received the DC information can preferentially select the base station 20 with sufficient resources among other base stations 20 capable of DC.
  • FIG. 10 is a diagram illustrating an example of processing of the wireless communication system 10 according to the second embodiment. Except for the points described below, in FIG. 10, the processes denoted by the same reference numerals as those in FIG. 7 are the same as the processes described in FIG.
  • the base station 20m When the MR is received from the terminal device 30, the base station 20m specifies one or more base stations 20s that are transmission destinations of the DC determination request based on the quality information for each cell 200 included in the MR (S110). Then, the base station 20m transmits a DC determination request to the identified base station 20s via the core network 11 (S111).
  • the DC determination request is transmitted by multicast, for example.
  • Each base station 20s that has received the DC determination request determines whether or not DC is possible based on the state of the resource in the own device (S112-1 to 112-n). Then, each base station 20s transmits DC information indicating the determination result to the base station 20m via the core network 11 (S113-1 to 113-n). And the process after step S107 is performed.
  • the request unit 2111 transmits a DC determination request for requesting determination of whether or not DC is possible to each of the other base stations 20. Then, the selection unit 2114 acquires DC information from the other base station 20. Thereby, the process of determining whether or not DC is possible can be distributed to each of the other base stations 20.
  • the DC determination request may include information regarding communication traffic assigned to another base station 20 in the DC.
  • requirement can perform the determination whether DC is possible more accurately.
  • the base station 20m functioning as a master base station collects resource information from other base stations 20, and requests DC based on the collected resource information.
  • Other base stations 20 to be determined have been determined.
  • each base station 20 collects resource information from other base stations 20 before the execution of DC is decided, and is collected when the execution of DC is decided. Based on the resource information, another base station 20 that requests DC is determined.
  • the configuration of the wireless communication system 10 is the same as that of the wireless communication system 10 according to the first embodiment described with reference to FIG.
  • FIG. 11 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the third embodiment. Except for the points described below, in FIG. 11, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG.
  • base station information 2120 and resource information 2121 are stored.
  • Resource information 2121 stores resource information collected from other base stations 20 in association with cell IDs.
  • the control unit 211 executes each of the DC execution determination unit 2110, the collection unit 2112, the DC availability determination unit 2113, the selection unit 2114, the DC processing unit 2115, and the wireless communication control unit 2116 by executing the program read from the memory 212. Realize the function.
  • the collection unit 2112 receives the resource information transmitted from the other base station 20 via the communication unit 210 and the core network 11 before the DC execution determination unit 2110 determines to perform communication with the terminal device 30 by DC. To collect. Then, the collection unit 2112 stores the collected resource information in the resource information 2121 in the memory 212.
  • the DC availability determination unit 2113 refers to the resource information of the other base station 20 stored in the resource information 2121 when the DC execution determination unit 2110 determines that communication with the terminal device 30 is to be executed by DC. Then, the DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information stored in the resource information 2121. When the DC execution determination unit 2110 determines that the DC execution determination unit 2110 performs communication with the terminal device 30 by DC, for example, the DC availability determination unit 2113 uses the latest resource information of each other base station 20 stored in the resource information 2121, for example. Based on this, it is determined whether or not DC is possible. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
  • Base station 20s The configuration of the base station 20s in the present embodiment is the same as that in FIG. Therefore, the following description will be given with reference to FIG. Except for the points described below, the blocks described using FIG. 4 are the same as those of the base station 20s according to the first embodiment, and thus detailed description thereof is omitted.
  • the resource management unit 2117 transmits resource information to the base station 20m via the communication unit 210 and the core network 11 at every predetermined timing.
  • the predetermined timing is, for example, a timing at which each other base station 20 changes the resource state of the other base station 20 by a predetermined amount or more. Thereby, the communication traffic in the collection of resource information can be reduced.
  • the predetermined timing may be a periodic timing.
  • FIG. 12 is a diagram illustrating an example of processing of the wireless communication system 10 according to the third embodiment. Except for the points described below, in FIG. 12, the processes denoted by the same reference numerals as those in FIG. 7 are the same as the processes described in FIG.
  • each base station 20s When each base station 20s detects that the state of the resource has changed by a predetermined amount or more (S120-1 to 120-n), the base station 20s transmits the resource information to the base station 20m via the core network 11 (S121- 1-120-n).
  • the base station 20m determines to execute communication with the terminal device 30 by DC (S100)
  • the base station 20m transmits an MR request to the terminal device 30 by a radio signal (S101).
  • the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200, and transmits the MR including the quality information for each surrounding cell 200 to the base station 20m (S102).
  • the base station 20m determines whether or not DC is possible for each base station 20s based on the latest resource information collected from each base station 20s (S106). And the process after step S107 is performed.
  • the process of step S106 may be performed before the process of step S101, and may be performed in parallel with the process of step S101.
  • the DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC.
  • the collection unit 2112 collects the resource information of the other base stations 20 from each of the other base stations 20 before the DC execution determination unit 2110 determines that communication with the terminal device 30 is to be performed by DC.
  • the DC availability determination unit 2113 is based on the latest resource information of each other base station 20 collected by the collection unit 2112. Then, it is determined whether or not DC is possible. Thereby, the DC availability determination unit 2113 can determine whether or not DC is possible for each of the other base stations 20 more quickly.
  • the collection unit 2112 collects resource information in each of the other base stations 20 when the resource state of the other base station 20 changes by a predetermined amount or more. Thereby, the communication traffic in the collection of resource information can be reduced.
  • each base station 20 is realized by a plurality of devices including at least one CU (Central Unit) and one DU (Distributed Unit). Is different.
  • CU Central Unit
  • DU Distributed Unit
  • FIG. 13 is a diagram illustrating an example of the wireless communication system 10 according to the fourth embodiment.
  • the wireless communication system 10 includes a plurality of base stations 20 and a terminal device 30. Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11.
  • the base station 20-1 has a CU 22-1 and a plurality of DUs 23-1 to 23-3
  • the base station 20-2 has a CU 22-2 and a plurality of DUs 23-4 to 23-6.
  • the plurality of DUs 23-1 to 23-3 form a cell 200-1
  • the plurality of DUs 23-4 to 23-5 form a cell 200-2
  • the DU 23-6 includes a cell 200-1. -3.
  • each of the plurality of DUs 23-1 to 23-6 is collectively referred to as DU23 without being distinguished.
  • Each CU 22 is an example of a communication control device
  • each DU 23 is an example of a wireless device.
  • the wireless communication system 10 includes two base stations 20, but the wireless communication system 10 may include three or more base stations 20.
  • one base station 20 includes one CU 22 and three DUs 23, but the number of CUs 22 and DUs 23 included in one base station 20 is not limited to this.
  • Each CU 22 is realized by a control device such as BBU, and each 23 is realized by a radio device such as RRH.
  • FIG. 14 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the fourth embodiment.
  • the CU 22 of the base station 20 m includes a communication unit 220, a control unit 221, a memory 222, and a communication unit 223. Except for the points described below, in FIG. 14, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG.
  • FIG. 15 is a diagram illustrating an example of the base station information 2120 according to the fourth embodiment.
  • CU_ID is information for identifying the CU 22 that manages the DU 23 that manages the cell 200 having the associated cell ID.
  • the access information is information for accessing the CU 22 identified by the corresponding CU_ID, such as address information.
  • the DU_ID is information for identifying the DU 23 that manages the cell 200 having the associated cell ID.
  • the base station information 2120 is stored in the memory 222 in advance by an administrator of the base station 20 or the like.
  • the memory 222 stores various programs executed by the control unit 221.
  • the control unit 221 executes a program read from the memory 222, thereby executing a DC execution determination unit 2110, a request unit 2111, a collection unit 2112, a DC availability determination unit 2113, a selection unit 2114, a DC processing unit 2115, and a wireless communication control. Each function of the unit 2116 is realized.
  • the DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC.
  • the DC execution determination unit 2110 determines whether or not to perform communication with the terminal device 30 by DC based on, for example, the resource statuses of the CU 22 and the respective DUs 23 included in the base station 20.
  • the collection unit 2112 collects resource information including information indicating the state of the resources of the CU 22 and the DU 23 for each cell ID from each of the other base stations 20.
  • the DC availability determination unit 2113 determines whether DC is possible for each combination of the CU 22 and the DU 23 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
  • the selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each combination of the CU 22 and the DU 23 of the other base station 20 before the DC is requested to the other base station 20. Based on the DC information output from the DC availability determination unit 2113, the selection unit 2114 selects the CU 22 that requests DC from the combination of the CU 22 and DU 23 corresponding to the DC information indicating that DC is possible. A combination of DUs 23 is selected. For example, the selection unit 2114 preferentially selects a combination including the DU 23 that manages the cell 200 with good signal quality from among the combinations of the CU 22 and the DU 23 corresponding to DC information indicating that DC is possible. . Then, the selection unit 2114 outputs information on the selected combination to the DC processing unit 2115.
  • the DC processing unit 2115 transmits a DC request, which is a control signal for requesting DC, to the CU 22 included in the combination selected by the selection unit 2114 via the communication unit 210 and the core network 11.
  • the DC request includes information regarding the combination of the CU 22 and the DU 23 that requests DC.
  • the wireless communication control unit 2116 executes processing of a higher layer protocol among the wireless control protocols.
  • the radio communication control unit 2116 executes, for example, processing of an upper layer (RRC layer, PDCP layer, RLC layer, and MAC layer) in LLS (Low Layer Split).
  • the wireless communication control unit 2116 may execute part of the physical layer processing.
  • the wireless communication control unit 2116 may execute processing of higher layers (RRC layer and PDCP layer) in HLS (High Layer Split), for example.
  • the communication unit 223 transmits and receives signals by optical communication between the CU 22 and each DU 23 according to a communication standard such as CPRI (Common Public Radio Interface).
  • CPRI Common Public Radio Interface
  • Each DU 23 includes a communication unit 230, a radio unit 231, a control unit 232, a memory 233, and an antenna 234.
  • the communication unit 230 transmits and receives signals by optical communication between the DU 23 and the CU 22 according to a communication standard such as CPRI.
  • control unit 232 In the memory 233, for example, various programs executed by the control unit 232 are stored.
  • the control unit 232 includes a processor such as a CPU or a DSP, for example, and implements each function of the control unit 232 by executing a program read from the memory 233.
  • the radio unit 231 transmits the radio signal via the antenna 234, thereby forming the cell 200 in a range where the radio signal reaches.
  • the radio unit 231 executes a lower layer protocol process of the radio control protocol on the signal output from the CU 22 via the communication unit 230 and the signal received via the antenna 234.
  • the wireless unit 231 executes, for example, processing of a lower layer (physical layer) in LLS. Note that the wireless unit 231 may execute part of the physical layer processing. Further, the radio unit 231 may execute processing of lower layers (RLC layer, MAC layer, and physical layer) in HLS, for example.
  • the wireless unit 231 is an example of a transmission unit, a reception unit, and a transmission / reception unit.
  • the radio unit 231 of the DU 23 can perform DC based on the DC information acquired for each of the plurality of other base stations 20 before DC is requested to the other base station 20.
  • the other base station 20 requesting the DC is selected from the other base stations 20 corresponding to the DC information indicating the DC, and the DC is requested among the communication traffic with the terminal device 30 performed by the DC.
  • Data based on the remaining communication traffic excluding communication traffic of other base stations is transmitted to and received from the terminal device 30 by wireless communication.
  • FIG. 16 is a block diagram illustrating an example of a base station 20s functioning as a secondary base station in the fourth embodiment. Except for the points described below, in FIG. 16, blocks denoted by the same reference numerals as those in FIG. 4 or FIG. 14 have the same or similar functions as the blocks in FIG.
  • the control unit 221 of the base station 20 s according to the fourth embodiment implements the functions of the DC processing unit 2115, the wireless communication control unit 2116, and the resource management unit 2117 by executing the program read from the memory 222.
  • the resource management unit 2117 When the resource management unit 2117 receives a resource information request from the base station 20m via the core network 11 and the communication unit 210, the resource management unit 2117 transmits the resource information request to each DU 23 in the base station 20s via the communication unit 223. . Then, the resource management unit 2117 acquires resource information from each DU 23 via the communication unit 223. Then, the resource management unit 2117 transmits resource information indicating the resource status of the CU 22 and each DU 23 in the base station 20 s to the base station 20 m via the communication unit 210 and the core network 11.
  • FIG. 17 is a diagram illustrating an example of data included in the resource information 50 in the fourth embodiment.
  • CU_ID CU resource information
  • DU_ID DU resource information
  • the CU resource information is resource information of the CU 22 corresponding to the CU_ID.
  • the DU resource information is resource information of the DU 23 corresponding to the DU_ID.
  • Each DU 23 is the same as the DU 23 described in FIG. 14 except for the points described below, and thus detailed description thereof is omitted.
  • the control unit 232 receives a resource information request from the CU 22 via the communication unit 230, the control unit 232 transmits resource information indicating the state of the resource in the DU 23 to the CU 22 via the communication unit 230. Further, when receiving a DC request from the CU 22, the control unit 232 returns an ACK to the CU 22 if the DC is possible, and returns a NACK (Negative ACKnowledgement) to the CU 22 if the DC is difficult.
  • NACK Negative ACKnowledgement
  • FIG. 18 is a diagram illustrating an example of processing of the wireless communication system 10 according to the fourth embodiment.
  • a radio communication system 10 including one terminal device 30, one base station 20m that functions as a master base station, and one base station 20s that functions as a candidate for a secondary base station is assumed.
  • the radio communication system 10 may include a plurality of base stations 20s.
  • the terminal device 30 is located in the cell 200 formed by the DU 23-1 in the base station 20m.
  • the CU 22-1 of the base station 20m functioning as the master base station performs communication with the terminal device 30 by DC based on the resource state of the CU 22-1 and each DU 23 in the base station 20m. Determine whether or not. Then, the CU 22-1 determines to perform communication with the terminal device 30 by DC (S200). Then, the CU 22-1 transmits the MR request to the DU 23 (DU 23-1 in the example of FIG. 18) that communicates with the terminal device 30 by DC (S201). The DU 23-1 transmits the MR request transmitted from the CU 22-1 to the terminal device 30 by a radio signal (S202).
  • the terminal device 30 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. Then, the terminal device 30 creates an MR including quality information indicating the quality of the signal for each surrounding cell 200, and transmits the created MR to the DU 23-1 (S203).
  • the DU 23-1 transfers the received MR to the CU 22-1 (S204). Based on the quality information for each cell 200 included in the MR transferred from the DU 23-1, the CU 22-1 specifies one or more base stations 20s that are the transmission destinations of the resource information request (S205). Then, the CU 22-1 transmits a resource information request to the CU 22-2 of the specified base station 20s via the core network 11 (S206). When a plurality of base stations 20s as transmission destinations of resource information requests are specified, the resource information requests are transmitted to the CU 22-2 of each base station 20s by, for example, multicast.
  • each base station 20s When receiving the resource information request from the base station 20m via the core network 11, the CU 22-2 of each base station 20s transmits the resource information request to each DU 23 in the base station 20s (S207-1 to S207). -3).
  • each DU 23 transmits resource information indicating the state of the resource in the DU 23 to the CU 22-2 (S208-1 to S208-3).
  • the CU 22-2 transmits resource information indicating the state of the resources of the CU 22-2 and each DU 23 in the base station 20s to the base station 20m via the core network 11 (S209).
  • the CU 22-1 of the base station 20m determines whether or not DC is possible for each combination of the CU 22 and the DU 23 based on the resource information received from the base station 20s (S210). Then, the CU 22-1 selects the combination of the CU 22 and the DU 23 that requests DC from the combination of the CU 22 and the DU 23 that can be DC (S211). The CU 22-1 selects, for example, a combination including the DU 23 that manages the cell 200 having the best quality of the signal received by the terminal device 30 among the combinations of the CU 22 and the DU 23 of the base station 20s capable of DC. . In the example of FIG. 18, the DU 23-4 is the DU 23 that manages the cell 200 with the best quality of the signal received by the terminal device 30.
  • the CU 22-1 transmits a DC request, which is a control signal for requesting DC, to the CU 22 (CU 22-2 in the example of FIG. 18) included in the combination selected in step S211 via the core network 11. (S212).
  • the CU 22-2 that has received the DC request transfers the DC request to the DU 23-4 (S213).
  • the DU 23-4 transmits an ACK indicating acceptance of the DC request to the CU 22-2 (S214).
  • the CU 22-2 transmits ACK indicating acceptance of the DC request to the CU 22-1 via the core network 11 (S215).
  • the base station 20m and the base station 20s-1 cooperate to execute wireless communication with the terminal device 30 by DC.
  • the base station 20 of this embodiment includes the CU 22 and a plurality of DUs 23.
  • the CU 22 that requests DC to the CU 22 of another base station 20 can perform DC for each combination of the CU 22 and DU 23 in each other base station 20 before requesting DC to the other base station 20.
  • DC information indicating whether or not is collected.
  • the CU 22 that requests DC to the CU 22 of another base station 20 specifies the combination of the CU 22 and DU 23 that requests DC based on the collected DC information, and sends the DC to the CU 22 included in the specified combination.
  • the base station 20 of a present Example can raise possibility that a DC request
  • the CU processes both control plane data and user plane data.
  • CU-CP Central Unit-C-Plane
  • CU-UP Central Unit-U-Plane
  • FIG. 19 is a diagram illustrating an example of the wireless communication system 10 according to the fifth embodiment.
  • the wireless communication system 10 includes a plurality of base stations 20 and a terminal device 30. Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11.
  • the base station 20-1 has a CU-CP 24, a plurality of CU-UPs 25-1 to 25-2, and a plurality of DUs 23-1 to 6.
  • the CU-UP 25-1 is connected to DUs 23-1 to 23-3
  • the CU-UP 25-2 is connected to DUs 23-4 to 23-6.
  • the plurality of DUs 23-1 to 23-3 form the cell 200-1
  • the plurality of DUs 23-4 to 23-5 form the cell 200-2
  • the DU 23-6 A cell 200-3 is formed.
  • CU-UP25 a plurality of CU-UPs 25-1 to 25-2 are collectively referred to as CU-UP25 without being distinguished, and a plurality of DUs 23-1 to 23-6 are not distinguished from each other.
  • DU23 it is described as DU23.
  • the CU-CP 24 is an example of a communication control device, and each DU 23 is an example of a wireless device.
  • one CU-CP 24, two CU-UPs 25, and six DUs 23 are provided in each base station 20, but the CU-CP 24, CU-UP 25, and DU 23
  • the number is not limited to this.
  • the CU-CP 24 and each CU-UP 25 are realized by a control device such as BBU, for example, and each DU 23 is realized by a radio device such as RRH, for example.
  • the CU-CP 24 or each CU-UP 25 may be included in a radio apparatus such as an RRH.
  • the CU-CP 24 and each CU-UP 25 may be realized in separate control devices.
  • FIG. 20 is a block diagram illustrating an example of the CU-CP 24 according to the fifth embodiment.
  • the CU-CP 24 includes a communication unit 240, a control unit 241, a memory 242, and a communication unit 243, for example, as shown in FIG. Except for the points described below, in FIG. 20, blocks denoted by the same reference numerals as those in FIG. 2 or FIG. 11 have the same or similar functions as the blocks in FIG.
  • FIG. 21 is a diagram illustrating an example of the base station information 2120 according to the fifth embodiment.
  • CU-CP_ID is information for identifying the CU-CP 24 that manages the CU-UP 25 that transmits and receives user data via the DU 23 that manages the cell 200 corresponding to the cell ID.
  • the access information is information for accessing the CU-CP 24 identified by the corresponding CU-CP_ID, such as address information.
  • the base station information 2120 is stored in the memory 242 in advance by an administrator of the base station 20 or the like. In the memory 242, various programs executed by the control unit 241 are stored.
  • the control unit 241 executes each program of the DC execution determination unit 2110, the collection unit 2112, the DC availability determination unit 2113, the selection unit 2114, the DC processing unit 2115, and the wireless communication control unit 2116 by executing the program read from the memory 242. Realize the function.
  • the collection unit 2112 collects resource information including information indicating the state of the resources of the CU-UP 25 and the DU 23 for each cell ID from each CU-UP 25. Then, the collection unit 2112 stores the collected resource information in the resource information 2121 in the memory 242.
  • FIG. 22 is a diagram illustrating an example of data included in the resource information 51 in the fifth embodiment.
  • the memory 212 collects resource information 51 as shown in FIG. 22 from each CU-UP 25, for example.
  • the resource information 51 stores CU-UP_ID, CU-UP resource information, DU_ID, and DU resource information in association with the cell ID.
  • the CU-UP_ID is information for identifying the CU-UP 25 that transmits and receives user data via the DU 23 that manages the cell 200 corresponding to the cell ID.
  • the CU-UP resource information is resource information of the CU-UP 25 corresponding to the CU-UP_ID.
  • the DU resource information is resource information of the DU 23 corresponding to the DU_ID.
  • the DC execution determination unit 2110 refers to the resource information 2121 in the memory 242, and determines whether or not to perform communication with the terminal device 30 by DC based on the resource statuses of the CU-UP 25 and the DU 23, respectively. judge.
  • the DC availability determination unit 2113 determines whether DC is possible for each combination of the CU-UP 25 and the DU 23 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
  • the selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each combination of the CU-UP 25 and the DU 23 before DC is requested to the DU 23. Based on the DC information output from the DC availability determination unit 2113, the selection unit 2114 selects the CU that requests DC from the combination of the CU-UP 25 and the DU 23 corresponding to the DC information indicating that DC is possible. -Select the combination of UP25 and DU23. For example, among the combinations of CU-UP 25 and DU 23 corresponding to DC information indicating that DC is possible, the selection unit 2114 preferentially selects a combination including the DU 23 that manages the cell 200 with good signal quality. select. Then, the selection unit 2114 outputs information related to the selected combination of the CU-UP 25 and the DU 23 to the DC processing unit 2115.
  • the DC processing unit 2115 transmits a control signal for requesting DC to the CU-UP 25 included in the combination selected by the selection unit 2114.
  • the control signal for requesting DC includes information on the combination of CU-UP 25 and DU 23 for requesting DC.
  • the radio communication control unit 2116 executes processing of the upper layer protocol in the control plane among the radio control protocols.
  • the radio communication control unit 2116 executes, for example, processing of an upper layer (RRC layer, PDCP-C layer, RLC-C layer, and MAC-C layer) of a control plane in LLS.
  • the wireless communication control unit 2116 may execute part of the physical layer processing.
  • the radio communication control unit 2116 may execute processing of higher layers (RRC-C layer and PDCP-C layer) in HLS, for example.
  • the communication unit 243 performs transmission and reception of signals by optical communication with each CU-UP 25 according to a communication standard such as CPRI.
  • FIG. 23 is a block diagram illustrating an example of the CU-UP 25 according to the fifth embodiment.
  • the CU-UP 25 includes a communication unit 250, a control unit 251, a memory 252, and a communication unit 253, for example, as shown in FIG. Except for the points described below, in FIG. 23, blocks denoted by the same reference numerals as those in FIG. 4 have the same or similar functions as the blocks in FIG.
  • the communication unit 250 is an example of a transmission unit, a reception unit, and a transmission / reception unit.
  • control unit 251 In the memory 252, various programs executed by the control unit 251 are stored.
  • the control unit 251 implements the functions of the DC processing unit 2115, the resource management unit 2117, and the wireless communication control unit 2118 by executing the program read from the memory 252.
  • the resource management unit 2117 manages the resource status of each subordinate DU 23. Further, the resource management unit 2117 transmits the resource information to the CU-CP 24 via the communication unit 250 at every predetermined timing.
  • the predetermined timing is, for example, a timing at which the resource state has changed by a predetermined amount or more in the CU-UP 25 or each DU 23. As a result, communication traffic for collecting resource information can be reduced between the CU-CP 24 and each CU-UP 25.
  • the predetermined timing may be a periodic timing.
  • the wireless communication control unit 2118 executes processing of the upper layer protocol in the user plane among the wireless control protocols.
  • the radio communication control unit 2118 executes, for example, processing of upper layers (PDCP-U layer, RLC-U layer, and MAC-U layer) of the user plane in LLS.
  • the wireless communication control unit 2116 may execute part of the physical layer processing.
  • the radio communication control unit 2116 may execute processing of an upper layer (PDCP-U layer) in HLS, for example.
  • the communication unit 253 transmits and receives signals by optical communication between the CU-UP 25 and each DU 23 in accordance with a communication standard such as CPRI.
  • Each DU 23 is the same as the DU 23 described in FIG. 14 except for the points described below, and thus detailed description thereof is omitted.
  • the control unit 232 of each DU 23 receives a resource information request from the CU-UP 25 via the communication unit 230, resource information indicating the state of the resource in the DU 23 is transmitted to the CU-UP 25 via the communication unit 230. Send. Also, when receiving a DC request from the CU-UP 25, the control unit 232 returns ACK to the CU-UP 25 if DC is possible, and returns NACK to the CU-UP 25 if DC is difficult.
  • FIG. 24 is a diagram illustrating an example of processing of the wireless communication system 10 according to the fifth embodiment.
  • each DU 23 transmits resource information to the CU-UP 25 (S300, S301).
  • Each CU-UP 25 transmits the resource information received from the DU 23 to the CU-CP 24 including information indicating the resource state of the CU-UP 25 (S302, S303).
  • the CU-CP 24 stores the resource information transmitted from each CU-UP 25.
  • the resource information transmitted in steps S300 to S303 is determined based on whether or not communication with the terminal device 30 is executed by DC and whether or not DC can be executed for each combination of the CU-UP 25 and the DU 23. Used for both.
  • the CU-CP 24 determines whether or not to communicate with the terminal device 30 by DC based on the resource information transmitted from each CU-UP 25.
  • the CU-CP 24 decides to execute communication with the terminal device 30 by DC (S304)
  • the CU-CP 24-1 communicates with the DU 23-1 that communicates with the terminal device 30 by DC. (S305).
  • the CU-UP 25-1 transfers the MR request transmitted from the CU-CP 24 to the DU 23-1 (S306).
  • the DU 23-1 transmits the MR request transmitted from the CU-UP 25-1 to the terminal device 30 using a radio signal (S307).
  • the terminal device 30 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. Then, the terminal device 30 creates an MR including quality information indicating the quality of the signal for each surrounding cell 200, and transmits the created MR to the DU 23-1 (S308).
  • the DU 23-1 transfers the MR received from the terminal device 30 to the CU-UP 25-1 (S309).
  • the CU-UP 25-1 transfers the MR received from the DU 23-1 to the CU-CP 24 (S310).
  • the CU-CP 24 determines whether or not DC is possible for each combination of CU-UP 25 and DU 23 based on the latest resource information collected from each CU-UP 25 (S311). Then, the CU-CP 24 selects a combination of the CU-UP 25 and the DU 23 that is a transmission destination of the DC request from among the combinations of the CU-UP 25 and the DU 23 that can perform DC (S312). For example, the CU-CP 24 preferentially selects a combination including the DU 23 that manages the cell 200 having the best quality of the signal received by the terminal device 30 among the combinations of the CU-UP 25 and the DU 23 in which DC is possible. To do. In the example of FIG. 24, the DU 23-4 is the DU 23 that manages the cell 200 having the best signal quality received by the terminal device 30.
  • the CU-CP 24 sends a DC request including information on the combination of the CU 22 and the DU 23 that requests DC to the CU-UP 25 (CU-UP 25-2 in the example of FIG. 24) included in the combination selected in step S312. (S313).
  • the CU-UP 25-2 receives the DC request and transmits the DC request to the DU 23 (DU 23-4 in the example of FIG. 24) corresponding to the combination included in the DC request (S314).
  • the DU 23-4 transmits an ACK to the CU-UP 25-2 when accepting the DC request (S315).
  • CU-UP 25-2 transmits ACK to CU-CP 24 (S316).
  • the CU-UP 25-1 and DU 23-1, and the CU-UP 25-2 and DU 23-4 cooperate to execute wireless communication with the terminal device 30 through DC.
  • the base station 20 of this embodiment includes the CU-CP 24, the plurality of CU-UPs 25, and the plurality of DUs 23.
  • the CU-CP 24 collects DC information indicating whether or not DC is possible for each combination of the CU-UP 25 and the DU 23 before requesting the DC to the DU 23.
  • the CU-CP 24 specifies a combination of the CU-UP 25 and the DU 23 that requests DC based on the collected DC information, and requests the DC from the CU-UP 25 included in the specified combination.
  • the base station 20 of a present Example can raise possibility that a DC request
  • the CU-CP 24 uses the resource information transmitted at a predetermined timing from each CU-UP 25 to determine whether or not to perform communication with the terminal device 30 by DC, and Both the determination as to whether or not the DC can be executed is performed.
  • the CU-CP 24 uses the first resource information transmitted from each CU-UP 25 at a predetermined timing to determine whether or not to execute communication with the terminal device 30 by DC. Judgment is made. Further, the second resource information used for determining whether or not DC can be executed is collected after it is determined that communication with the terminal device 30 is executed by the DC.
  • the first resource information information on the buffer capacity and the capacity of each interface is collected as the first resource information, and in addition to the first resource information, the processor and memory usage rates are collected as the second resource information.
  • the data amount of 1st resource information can be made smaller than the data amount of 2nd resource information.
  • the second resource information is collected from the other base station 20 specified based on the MR received from the terminal device 30. As a result, it is possible to reduce communication traffic in the collection of resource information among the CU-CP 24, each CU-UP 25, and each DU 23.
  • FIG. 25 is a block diagram illustrating an example of the CU-CP 24 according to the sixth embodiment. Except for the points described below, in FIG. 25, blocks denoted by the same reference numerals as those in FIG. 20 have the same or similar functions as the blocks in FIG.
  • the collection unit 2112 stores the first resource information and the second resource information transmitted from each CU-UP 25 in the resource information 2121 in the memory 242.
  • the DC execution determination unit 2110 refers to the first resource information included in the resource information 2121 in the memory 242, and based on the resource statuses of the CU-UP 25 and the respective DUs 23, the DC execution determination unit 2110 communicates with the terminal device 30 by the DC. It is determined whether to execute communication. If the resource information 2121 includes the second resource information, the DC execution determination unit 2110 may determine whether to perform communication with the terminal device 30 by using the DC.
  • the request unit 2111 When receiving the MR from the terminal device 30, the request unit 2111 has one CU-UP 25 as a transmission destination of the resource information request for requesting the second resource information based on the quality information for each cell 200 included in the MR. The above is specified. Then, the request unit 2111 transmits a resource information request to the identified CU-UP 25 via the communication unit 243.
  • the resource information request includes information on the DU 23.
  • the resource information request is transmitted by multicast, for example.
  • the request unit 2111 specifies, for example, a CU-UP 25 that communicates with the DU 23 that manages each cell 200 as the CU-UP 25 that is the transmission destination of the resource information for a predetermined number of cells 200 in order of good signal quality. .
  • the request unit 2111 sets the CU-UP 25 that communicates with the DU 23 that manages each cell 200 as the CU-UP 25 that is the transmission destination of the resource information request. You may specify.
  • the DC availability determination unit 2113 refers to the resource information 2121 in the memory 242 and determines whether DC is possible for each combination of the CU-UP 25 and the DU 23. Whether or not DC is possible is determined based on the second resource information. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
  • Each CU-UP 25 is the same as the CU-UP 25 described with reference to FIG. 23 except for the points described below, and a detailed description thereof will be omitted.
  • the resource management unit 2117 transmits the first resource information to the CU-CP 24 via the communication unit 250 at every predetermined timing.
  • the resource management unit 2117 receives a resource information request from the CU-CP 24 via the communication unit 250, the resource management unit 2117 transmits the second resource information to the CU-CP 24 via the communication unit 250.
  • FIG. 26 is a diagram illustrating an example of processing of the wireless communication system 10 according to the sixth embodiment. Except for the points described below, in FIG. 26, the processes denoted by the same reference numerals as those in FIG. 24 are the same as the processes described in FIG.
  • each DU 23 detects that the state of the resource corresponding to the item included in the first resource information has changed by a predetermined amount or more, it transmits the first resource information to the CU-UP 25 (S300, S301). ).
  • Each CU-UP 25 transmits the first resource information received from the DU 23 to the CU-CP 24 including information indicating the state of the resource of the CU-UP 25 corresponding to the item included in the first resource information ( S302, S303).
  • the CU-CP 24 stores the resource information transmitted from each CU-UP 25.
  • the CU-CP 24 determines whether or not to communicate with the terminal device 30 by DC based on the resource information transmitted from each CU-UP 25.
  • the CU-CP 24 decides to execute communication with the terminal device 30 by DC (S304)
  • the CU-CP 24-1 communicates with the DU 23-1 that communicates with the terminal device 30 by DC. (S305).
  • the CU-CP 24 When receiving the MR from the CU-UP 25-1, the CU-CP 24 specifies one or more CU-UPs 25 to which the resource information request is transmitted based on the quality information for each cell 200 included in the MR (S320). . Then, the CU-CP 24 transmits a resource information request to the specified CU-UP 25 (S321).
  • the resource information request is transmitted by multicast, for example.
  • each CU-UP 25 collects the second resource information from the DU 23 included in the resource information request (S322, S324). Then, each CU-UP 25 transmits the second resource information received from the DU 23 to the CU-CP 24 including information indicating the resource status of the CU-UP 25 corresponding to the item included in the second resource information. (S303, S305). The CU-CP 24 stores the second resource information transmitted from each CU-UP 25. And the radio
  • Example 6 has been described above. As described above, in this embodiment, it is determined whether or not communication with the terminal device 30 is executed by the DC using the first resource information transmitted from each CU-UP 25 at a predetermined timing. Is called. Further, the second resource information used for determining whether or not DC can be executed is collected after it is determined that communication with the terminal device 30 is executed by the DC. The data amount of the first resource information can be made smaller than the data amount of the second resource information. Thereby, it is possible to reduce communication traffic in the collection of resource information among the CU-CP 24, each CU-UP 25, and each DU 23.
  • the base station 20m determines whether or not DC is possible in the other base station 20s, but the disclosed technique is not limited thereto.
  • another base station 20s may determine whether or not DC is possible.
  • resource information is collected from another base station 20 after the execution of DC is determined, but the disclosed technique is not limited to this.
  • resource information may be collected from another base station 20 before the execution of DC is determined as in the third embodiment, for example.
  • the CU-CP 24 communicates with the CU-UP 25 via the CU-UP 25.
  • the disclosed technology is not limited to this, and the CU-CP 24 and each DU 23 are F1. You may communicate via the -C interface.
  • the CU-CP 24 determines whether or not DC is possible in each combination of the CU-UP 25 and the DU 23, but the disclosed technology is not limited thereto.
  • the CU-CP 24 may transmit a DC determination request to each CU-UP 25, and each CU-UP 25 may determine whether or not DC is possible for each combination of the CU-UP 25 and the DU 23.
  • each block in the base station 20 may be realized by an independent computer, or may be realized by one computer having one or more memories and processors.
  • each processing block of the base station 20 is classified by function according to main processing contents in order to facilitate understanding of each device in the embodiment. For this reason, the disclosed technique is not limited by the processing block classification method and its name.
  • each processing block of the base station 20 can be subdivided into a larger number of processing blocks according to the processing content, or a plurality of processing blocks can be integrated into one processing block.
  • part or all of the processing executed by each processing block may be realized as software processing, or may be realized by dedicated hardware such as ASIC (Application Specific Integrated Circuit).

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Abstract

This communication control device (20) includes a wireless communication control unit (2116), a communication unit (210), and a selection unit (2114). The wireless communication control unit controls a communication with a terminal device that uses a first wireless frequency, or controls a communication with the terminal device through a connected wireless device. The communication unit transmits, to other communication control devices, a signal for requesting control information relating to whether a communication is possible with the terminal device by using a second wireless frequency that is different from the first wireless frequency. In addition, the communication unit receives signals including the control information from the other communication control devices. The selection unit selects, from among the other communication control devices, one communication control device that uses the second wireless frequency and performs the communication with the terminal device. In addition, the communication unit transmits, to the one communication control device, a control signal including information relating to the communication with the terminal device that uses the second wireless frequency.

Description

通信制御装置、無線装置、および無線通信システムCOMMUNICATION CONTROL DEVICE, RADIO DEVICE, AND RADIO COMMUNICATION SYSTEM
　本発明は、通信制御装置、無線装置、および無線通信システムに関する。 The present invention relates to a communication control device, a wireless device, and a wireless communication system.
　現在のネットワークは、モバイル端末（スマートフォンやフィーチャーホン）のトラフィックがネットワークのリソースの大半を占めている。また、モバイル端末が使うトラフィックは、今後も拡大していく傾向にある。 In the current network, traffic from mobile terminals (smartphones and feature phones) occupies most of the network resources. In addition, the traffic used by mobile terminals tends to continue to expand.
　一方で、ＩｏＴ（Internet　of　a　things）サービス（例えば、交通システム、スマートメータ、装置等の監視システム）の展開にあわせて、多様な要求条件を持つサービスに対応することが求められている。そのため、第５世代移動体通信（５Ｇまたは、ＮＲ（New　Radio））の通信規格では、４Ｇ（第４世代移動体通信）の標準技術（例えば、非特許文献１～１１）に加えて、さらなる高データレート化、大容量化、低遅延化を実現する技術が求められている。なお、第５世代通信規格については、３ＧＰＰの作業部会（例えば、TSG-RAN　WG1、TSG-RAN　WG2等）で技術検討が進められている。（例えば、非特許文献１２～３９） On the other hand, in response to the development of IoT (Internet of a things) services (for example, monitoring systems for traffic systems, smart meters, devices, etc.), it is required to support services with various requirements. Therefore, in addition to the standard technology of 4G (4th generation mobile communication) (for example, Non-Patent Documents 1 to 11), the communication standard of 5th generation mobile communication (5G or NR (New Radio)) further There is a need for a technology that achieves a high data rate, large capacity, and low delay. Regarding the 5th generation communication standard, technical studies are underway by 3GPP working groups (for example, TSG-RAN WG1, TSG-RAN WG2, etc.). (For example, non-patent documents 12 to 39)
　上記で述べたように、多種多様なサービスに対応するために、５Ｇでは、ｅＭＢＢ（Enhanced　Mobile　BroadBand）、Ｍａｓｓｉｖｅ　ＭＴＣ（Machine　Type　Communications)、およびＵＲＬＬＣ（Ultra－Reliable　and　Low　Latency　Communication）に分類される多くのユースケースのサポートが想定されている。 As described above, in order to support a wide variety of services, 5G is classified into eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications). Support for many use cases is envisioned.
　また、近年のトラフィックの増大に伴う無線ネットワークの容量拡大の解決手段の一つとして、マクロセルの無線トラフィックを比較的送信電力の小さいスモールセルへとオフロードする、ＨｅｔＮｅｔ（Heterogenious　Network）の検討が行われてきた。ＨｅｔＮｅｔにＣＡ（Carrier　Aggregation）やＤＣ（Dual　Connectivity）の技術を適用することで、通信の安定性だけでなく、スモールセルによる容量の拡大を実現することが可能である。ＤＣは、隣接基地局に通信トラフィックをオフロードする技術である。 In addition, as one of the solutions for increasing the capacity of wireless networks due to the recent increase in traffic, HetNet (Heterogenious Network) is being studied to offload macrocell wireless traffic to small cells with relatively low transmission power. I have been. By applying CA (Carrier Aggregation) and DC (Dual Connectivity) technologies to HetNet, it is possible to realize not only the stability of communication but also the capacity expansion by small cells. DC is a technique for offloading communication traffic to adjacent base stations.
　ところで、通信トラフィックが増大すると、マクロセルやスモールセル等の基地局が輻輳状態となることがある。例えば、隣接基地局が輻輳状態である場合には、基地局がその隣接基地局にＤＣを要求しても、ＤＣが拒否されることになる。そのため、基地局は、ＤＣを受け入れる隣接基地局を見つけるために、複数の隣接基地局にＤＣを要求することになる。その結果、ＤＣが確立されるまでに時間がかかり、伝送速度を上げることが難しい。 By the way, if communication traffic increases, base stations such as macro cells and small cells may become congested. For example, when an adjacent base station is in a congested state, the DC is rejected even if the base station requests DC from the adjacent base station. Therefore, the base station requests DC from a plurality of neighboring base stations in order to find a neighboring base station that accepts the DC. As a result, it takes time until the DC is established, and it is difficult to increase the transmission speed.
　また、近年の無線通信システムでは、ピコセル等の高密度なセル配置が採用されている。さらに、５Ｇでは、ミリ波等のように従来よりもカバー範囲の狭い無線装置の使用も検討されており、基地局の高密度化はさらに進むと想定される。そのため、ＤＣの依頼先の候補となる隣接基地局の数も増加することになり、ＤＣを受け入れるマクロセルが見つかるまでに要する時間が増加する傾向にある。 In recent wireless communication systems, a high-density cell arrangement such as a pico cell is adopted. Furthermore, in 5G, use of a wireless device having a narrower cover range than in the past, such as millimeter waves, is being studied, and it is assumed that the density of base stations will further increase. For this reason, the number of neighboring base stations that are candidates for DC requests also increases, and the time required to find a macro cell that accepts a DC tends to increase.
　開示の技術は、上記に鑑みてなされたものであって、ＤＣをより迅速に確立することができる通信制御装置、無線装置、および無線通信システムを提供することを目的とする。 The disclosed technology has been made in view of the above, and an object thereof is to provide a communication control device, a wireless device, and a wireless communication system that can establish DC more quickly.
　本願が開示する通信制御装置は、１つの態様において、無線通信制御部と、送信部と、受信部と、選択部とを有する。無線通信制御部は、第１の無線周波数を用いた端末装置との通信を制御する、または、接続する無線装置を介して端末装置との通信を制御する。送信部は、他の通信制御装置に対して、第１の無線周波数と異なる第２の無線周波数を用いて端末装置との通信可否に関する制御情報を要求する信号を送信する。受信部は、他の通信制御装置から制御情報を含む信号を受信する。選択部は、他の通信制御装置から第２の無線周波数を用いて端末装置と通信を行う一の通信制御装置を選択する。また、送信部は、一の通信制御装置に第２の無線周波数を用いた端末装置と通信に関する情報を含む制御信号を送信する。 The communication control device disclosed in the present application includes, in one aspect, a wireless communication control unit, a transmission unit, a reception unit, and a selection unit. The wireless communication control unit controls communication with the terminal device using the first radio frequency, or controls communication with the terminal device via the connected wireless device. A transmission part transmits the signal which requests | requires the control information regarding the communication availability with a terminal device using the 2nd radio frequency different from a 1st radio frequency with respect to another communication control apparatus. The receiving unit receives a signal including control information from another communication control device. The selection unit selects one communication control device that communicates with the terminal device using the second radio frequency from another communication control device. In addition, the transmission unit transmits a control signal including information related to communication with the terminal device using the second radio frequency to one communication control device.
　本願が開示する通信制御装置、無線装置、および無線通信システムの１つの態様によれば、ＤＣをより迅速に確立することができるという効果を奏する。 According to one aspect of the communication control device, the wireless device, and the wireless communication system disclosed in the present application, it is possible to establish DC more quickly.
図１は、実施例１における無線通信システムの一例を示す図である。FIG. 1 is a diagram illustrating an example of a wireless communication system according to the first embodiment. 図２は、実施例１においてマスタ基地局として機能する基地局の一例を示すブロック図である。FIG. 2 is a block diagram illustrating an example of a base station that functions as a master base station in the first embodiment. 図３は、実施例１における基地局情報の一例を示す図である。FIG. 3 is a diagram illustrating an example of base station information according to the first embodiment. 図４は、実施例１においてセカンダリ基地局として機能する基地局の一例を示すブロック図である。FIG. 4 is a block diagram illustrating an example of a base station that functions as a secondary base station in the first embodiment. 図５は、端末装置の一例を示すブロック図である。FIG. 5 is a block diagram illustrating an example of a terminal device. 図６は、ＭＲ（Measurement　Report）に含まれるデータの一例を示す図である。FIG. 6 is a diagram illustrating an example of data included in an MR (Measurement Report). 図７は、実施例１における無線通信システムの処理の一例を示す図である。FIG. 7 is a diagram illustrating an example of processing of the wireless communication system according to the first embodiment. 図８は、実施例２においてマスタ基地局として機能する基地局の一例を示すブロック図である。FIG. 8 is a block diagram illustrating an example of a base station that functions as a master base station in the second embodiment. 図９は、実施例２においてセカンダリ基地局として機能する基地局の一例を示すブロック図である。FIG. 9 is a block diagram illustrating an example of a base station that functions as a secondary base station in the second embodiment. 図１０は、実施例２における無線通信システムの処理の一例を示す図である。FIG. 10 is a diagram illustrating an example of processing of the wireless communication system according to the second embodiment. 図１１は、実施例３においてマスタ基地局として機能する基地局の一例を示すブロック図である。FIG. 11 is a block diagram illustrating an example of a base station that functions as a master base station in the third embodiment. 図１２は、実施例３における無線通信システムの処理の一例を示す図である。FIG. 12 is a diagram illustrating an example of processing of the wireless communication system according to the third embodiment. 図１３は、実施例４における無線通信システムの一例を示す図である。FIG. 13 is a diagram illustrating an example of a wireless communication system according to the fourth embodiment. 図１４は、実施例４においてマスタ基地局として機能する基地局の一例を示すブロック図である。FIG. 14 is a block diagram illustrating an example of a base station that functions as a master base station in the fourth embodiment. 図１５は、実施例４における基地局情報の一例を示す図である。FIG. 15 is a diagram illustrating an example of base station information according to the fourth embodiment. 図１６は、実施例４においてセカンダリ基地局として機能する基地局の一例を示すブロック図である。FIG. 16 is a block diagram illustrating an example of a base station that functions as a secondary base station in the fourth embodiment. 図１７は、実施例４においてリソース情報に含まれるデータの一例を示す図である。FIG. 17 is a diagram illustrating an example of data included in the resource information in the fourth embodiment. 図１８は、実施例４における無線通信システムの処理の一例を示す図である。FIG. 18 is a diagram illustrating an example of processing of the wireless communication system according to the fourth embodiment. 図１９は、実施例５における無線通信システムの一例を示す図である。FIG. 19 is a diagram illustrating an example of a wireless communication system according to the fifth embodiment. 図２０は、実施例５におけるＣＵ－ＣＰの一例を示すブロック図である。FIG. 20 is a block diagram illustrating an example of a CU-CP according to the fifth embodiment. 図２１は、実施例５における基地局情報の一例を示す図である。FIG. 21 is a diagram illustrating an example of base station information according to the fifth embodiment. 図２２は、実施例５においてリソース情報に含まれるデータの一例を示す図である。FIG. 22 is a diagram illustrating an example of data included in resource information in the fifth embodiment. 図２３は、実施例５におけるＣＵ－ＵＰの一例を示すブロック図である。FIG. 23 is a block diagram illustrating an example of a CU-UP according to the fifth embodiment. 図２４は、実施例５における無線通信システムの処理の一例を示す図である。FIG. 24 is a diagram illustrating an example of processing of the wireless communication system according to the fifth embodiment. 図２５は、実施例６におけるＣＵ－ＣＰの一例を示すブロック図である。FIG. 25 is a block diagram illustrating an example of a CU-CP according to the sixth embodiment. 図２６は、実施例６における無線通信システムの処理の一例を示す図である。FIG. 26 is a diagram illustrating an example of processing of the wireless communication system according to the sixth embodiment.
　以下、本願が開示する通信制御装置、無線装置、および無線通信システムの実施例について、図面を参照しながら詳細に説明する。なお、以下の実施例により開示の技術が限定されるものではない。また、各実施例は、処理内容を矛盾させない範囲で適宜組み合わせることが可能である。 Hereinafter, embodiments of a communication control device, a wireless device, and a wireless communication system disclosed in the present application will be described in detail with reference to the drawings. The disclosed technology is not limited by the following embodiments. In addition, the embodiments can be appropriately combined within a range in which processing contents are not contradictory.
［無線通信システム１０］
　図１は、実施例１における無線通信システム１０の一例を示す図である。無線通信システム１０は、複数の基地局２０（２０－１、２０－２、・・・）と、端末装置３０とを備える。図１の例では、基地局２０－１は、セル２００－１を形成し、基地局２０－２は、セル２００－２を形成している。なお、以下では、複数の基地局２０－１、２０－２、・・・のそれぞれを区別することなく総称する場合に基地局２０と記載し、複数のセル２００－１、２００－２、・・・のそれぞれを区別することなく総称する場合にセル２００と記載する。それぞれの基地局２０は、コアネットワーク１１に接続されており、端末装置３０の無線接続を制御し、端末装置３０とコアネットワーク１１との間の通信を中継する。それぞれの基地局２０は、通信制御装置の一例である。 [Wireless communication system 10]
FIG. 1 is a diagram illustrating an example of a wireless communication system 10 according to the first embodiment. The wireless communication system 10 includes a plurality of base stations 20 (20-1, 20-2,...) And a terminal device 30. In the example of FIG. 1, the base station 20-1 forms a cell 200-1, and the base station 20-2 forms a cell 200-2. In the following description, a plurality of base stations 20-1, 20-2,... .. Are collectively referred to as the cell 200 without being distinguished from each other. Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11. Each base station 20 is an example of a communication control device.
　端末装置３０は、２つの基地局２０との間でＤＣ（Dual　Connectivity）による無線通信を行うことができる。ＤＣとは、２つの基地局２０のうちの一方の基地局２０との間で第１の無線周波数を用いて行う無線通信と、他方の基地局２０との間で第１の無線周波数とは異なる無線周波数を用いて行う無線通信とを同時に行う無線通信である。以下では、端末装置３０との間でＤＣを行う２つの基地局２０うち、一方をＤＣにおけるメイン基地局として機能する基地局２０ｍと記載し、他方をＤＣにおけるセカンダリ基地局として機能する基地局２０ｓと記載する。 The terminal device 30 can perform wireless communication by DC (Dual Connectivity) between the two base stations 20. DC refers to wireless communication performed using the first radio frequency with one of the two base stations 20 and the first radio frequency with the other base station 20. This is wireless communication in which wireless communication performed using different wireless frequencies is performed simultaneously. Hereinafter, one of the two base stations 20 that performs DC with the terminal device 30 is described as a base station 20m that functions as a main base station in DC, and the other is a base station 20s that functions as a secondary base station in DC. It describes.
［基地局２０ｍ］
　図２は、実施例１においてマスタ基地局として機能する基地局２０ｍの一例を示すブロック図である。基地局２０ｍは、例えば図２に示されるように、通信部２１０、制御部２１１、メモリ２１２、無線部２１３、およびアンテナ２１４を備える。なお、基地局２０ｍは、ＢＢＵ（Base　Band　Unit）等の制御装置、および、ＲＲＨ（Remote　Radio　Head）等の無線装置を有し、通信部２１０、制御部２１１、およびメモリ２１２は、ＢＢＵに設けられ、無線部２１３は、ＲＲＨに設けられてもよい。 [Base station 20m]
FIG. 2 is a block diagram illustrating an example of the base station 20m that functions as a master base station in the first embodiment. For example, as illustrated in FIG. 2, the base station 20 m includes a communication unit 210, a control unit 211, a memory 212, a radio unit 213, and an antenna 214. The base station 20m has a control device such as a BBU (Base Band Unit) and a radio device such as an RRH (Remote Radio Head), and the communication unit 210, the control unit 211, and the memory 212 are provided in the BBU. The radio unit 213 may be provided in the RRH.
　通信部２１０は、例えばＮＩＣ（Network　Interface　Card）等により実現され、コアネットワーク１１との間で信号の送受信を行う。通信部２１０は、送信部、受信部、および送受信部の一例である。メモリ２１２内には、例えば基地局情報２１２０が格納される。また、メモリ２１２内には、制御部２１１によって実行される各種プログラム等が格納される。制御部２１１は、例えばＣＰＵ（Central　Processing　Unit）またはＤＳＰ（Digital　Signal　Processor）等のプロセッサを有し、メモリ２１２から読み出したプログラムを実行することにより制御部２１１が有する各機能を実現する。 The communication unit 210 is realized by, for example, a NIC (Network Interface Card) or the like, and transmits and receives signals to and from the core network 11. The communication unit 210 is an example of a transmission unit, a reception unit, and a transmission / reception unit. In the memory 212, for example, base station information 2120 is stored. In the memory 212, various programs executed by the control unit 211 are stored. The control unit 211 includes a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), for example, and implements each function of the control unit 211 by executing a program read from the memory 212.
　無線部２１３は、アンテナ２１４を介して無線信号を送信することにより、無線信号が到達する範囲にセル２００を形成する。また、無線部２１３は、制御部２１１から出力された信号、および、アンテナ２１４を介して受信された信号に対して、例えば物理レイヤの処理を実行する。例えば、無線部２１３は、制御部２１１から出力された信号をデジタル信号からアナログ信号に変換する。そして、無線部２１３は、変換後の信号に対してアップコンバート、増幅、およびフィルタリング等の処理を施し、処理後の信号を、アンテナ２１４を介して空間に放射する。また、無線部２１３は、アンテナ２１４を介して受信された信号に対してフィルタリング、増幅、およびダウンコンバート等の処理を施す。そして、無線部２１３は、処理後の信号をアナログ信号からデジタル信号に変換して制御部２１１へ出力する。 The radio unit 213 transmits a radio signal via the antenna 214 to form the cell 200 in a range where the radio signal reaches. Further, the radio unit 213 performs, for example, physical layer processing on the signal output from the control unit 211 and the signal received via the antenna 214. For example, the wireless unit 213 converts the signal output from the control unit 211 from a digital signal to an analog signal. The radio unit 213 performs processing such as up-conversion, amplification, and filtering on the converted signal, and radiates the processed signal to the space via the antenna 214. The radio unit 213 performs processing such as filtering, amplification, and down-conversion on the signal received via the antenna 214. The wireless unit 213 converts the processed signal from an analog signal to a digital signal and outputs the converted signal to the control unit 211.
　なお、メモリ２１２内のプログラムやデータ等は、必ずしも全てが最初からメモリ２１２内に記憶されていなくてもよい。例えば、基地局２０ｍに挿入されるメモリカードなどの可搬型記録媒体にプログラムやデータ等が記憶され、基地局２０ｍがこのような可搬型記録媒体からプログラムやデータ等を適宜取得して実行するようにしてもよい。また、プログラムやデータ等を記憶させた他のコンピュータまたはサーバ装置などから、無線通信回線、公衆回線、インターネット、ＬＡＮ、ＷＡＮなどを介して、基地局２０ｍがプログラム等を適宜取得して実行するようにしてもよい。 Note that not all the programs and data in the memory 212 are necessarily stored in the memory 212 from the beginning. For example, a program or data is stored in a portable recording medium such as a memory card inserted into the base station 20m, and the base station 20m appropriately acquires and executes the program or data from such a portable recording medium. It may be. Further, the base station 20m appropriately acquires and executes the program etc. from another computer or server device storing the program, data, etc. via a wireless communication line, public line, Internet, LAN, WAN, etc. It may be.
　メモリ２１２には、例えば図３に示すような基地局情報２１２０が格納される。図３は、基地局情報２１２０の一例を示す図である。基地局情報２１２０には、例えば、それぞれのセル２００を識別するセルＩＤに対応付けて、基地局ＩＤおよびアクセス情報が格納される。基地局ＩＤは、それぞれの基地局２０を識別する情報である。アクセス情報は、対応する基地局ＩＤで識別される基地局２０にアクセスするための情報であり、例えばアドレス情報等である。基地局情報２１２０は、基地局２０の管理者等により、予めメモリ２１２内に格納される。 In the memory 212, for example, base station information 2120 as shown in FIG. 3 is stored. FIG. 3 is a diagram illustrating an example of the base station information 2120. In the base station information 2120, for example, a base station ID and access information are stored in association with a cell ID for identifying each cell 200. The base station ID is information for identifying each base station 20. The access information is information for accessing the base station 20 identified by the corresponding base station ID, such as address information. The base station information 2120 is stored in the memory 212 in advance by an administrator of the base station 20 or the like.
　制御部２１１は、メモリ２１２から読み出したプログラムを実行することにより、ＤＣ実行判定部２１１０、要求部２１１１、収集部２１１２、ＤＣ可否判定部２１１３、選択部２１１４、ＤＣ処理部２１１５、および無線通信制御部２１１６の各機能を実現する。 The control unit 211 executes a program read from the memory 212, thereby executing a DC execution determination unit 2110, a request unit 2111, a collection unit 2112, a DC availability determination unit 2113, a selection unit 2114, a DC processing unit 2115, and wireless communication control. Each function of the unit 2116 is realized.
　ＤＣ実行判定部２１１０は、ＤＣにより端末装置３０との通信を実行するか否かを判定する。ＤＣ実行判定部２１１０は、例えば基地局２０ｍが有するリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。リソースの状態とは、例えば、バッファの空き容量、および、コアネットワーク１１との間のインターフェイスの容量等である。また、リソースの状態には、この他に、端末装置３０との間で行われる通信のトラフィック量、プロセッサの使用率、またはメモリ２１２の使用率等が含まれていてもよい。 The DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC. The DC execution determination unit 2110 determines whether or not to perform communication with the terminal device 30 by DC based on, for example, the state of the resource of the base station 20m. The resource state includes, for example, the free capacity of the buffer and the capacity of the interface with the core network 11. In addition, the resource state may include the traffic volume of communication performed with the terminal device 30, the usage rate of the processor, the usage rate of the memory 212, or the like.
　ＤＣ実行判定部２１１０は、ＤＣにより端末装置３０との通信を実行すると判定した場合、端末装置３０にＭＲ（Measurement　Report）を要求するＭＲ要求を作成する。そして、ＤＣ実行判定部２１１０は、作成されたＭＲ要求を、無線部２１３を介して端末装置３０へ送信する。ＭＲ要求を受信した端末装置３０は、周囲のセル２００において基地局２０から送信された信号の品質を測定する。そして、端末装置３０は、周囲のセル２００毎の信号の品質を示す品質情報を含むＭＲを基地局２０ｍへ送信する。 The DC execution determination unit 2110 creates an MR request for requesting MR (Measurement Report) to the terminal device 30 when it is determined that communication with the terminal device 30 is executed by DC. Then, the DC execution determining unit 2110 transmits the created MR request to the terminal device 30 via the wireless unit 213. The terminal device 30 that has received the MR request measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. And the terminal device 30 transmits MR containing the quality information which shows the quality of the signal for every surrounding cell 200 to the base station 20m.
　要求部２１１１は、無線部２１３を介して端末装置３０からＭＲを受信した場合、ＭＲに含まれるセル２００毎の品質情報に基づいて、リソースの状態を示す情報を含むリソース情報を要求するリソース情報要求の送信先の他の基地局２０を１つ以上特定する。そして、要求部２１１１は、特定された他の基地局２０に、通信部２１０およびコアネットワーク１１を介してリソース情報要求を送信する。リソース情報要求は、例えばマルチキャストで送信される。 When the request unit 2111 receives an MR from the terminal device 30 via the radio unit 213, the request unit 2111 requests resource information including information indicating the state of the resource based on the quality information for each cell 200 included in the MR. One or more other base stations 20 to which the request is transmitted are specified. Then, the request unit 2111 transmits a resource information request to the other identified base station 20 via the communication unit 210 and the core network 11. The resource information request is transmitted by multicast, for example.
　要求部２１１１は、例えば、信号の品質が良い順に所定数のセル２００について、それぞれのセル２００を管理する他の基地局２０を、リソース情報要求の送信先の基地局２０として特定する。また、要求部２１１１は、例えば、信号の品質が所定の品質より良いセル２００について、それぞれのセル２００を管理する他の基地局２０を、リソース情報要求の送信先の基地局２０として特定してもよい。 The request unit 2111 identifies, for example, another base station 20 that manages each of the cells 200 as the base station 20 that is the transmission destination of the resource information request for a predetermined number of cells 200 in order of good signal quality. In addition, for example, for the cell 200 in which the signal quality is better than the predetermined quality, the request unit 2111 specifies another base station 20 that manages each cell 200 as the base station 20 that is the transmission destination of the resource information request. Also good.
　要求部２１１１からリソース情報要求を受信した他の基地局２０は、自装置のリソースの状態を示す情報を収集し、収集された情報を含むリソース情報を、コアネットワーク１１を介して基地局２０ｍへ送信する。リソース情報とは、基地局２０が有するリソースの状態であり、例えば、バッファの空き容量、および、コアネットワーク１１との間のインターフェイスの容量等である。また、リソース情報には、この他に、プロセッサの使用率、または、メモリの使用率等が含まれていてもよい。また、リソース情報は、無線リソースの情報であってもよい。 The other base station 20 that has received the resource information request from the request unit 2111 collects information indicating the state of the resource of the own device, and sends the resource information including the collected information to the base station 20m via the core network 11. Send. The resource information is the state of the resource that the base station 20 has, and is, for example, the free capacity of the buffer and the capacity of the interface with the core network 11. In addition, the resource information may include a processor usage rate or a memory usage rate. Further, the resource information may be radio resource information.
　収集部２１１２は、通信部２１０およびコアネットワーク１１を介して、他の基地局２０から送信されたリソース情報を収集する。 The collection unit 2112 collects resource information transmitted from other base stations 20 via the communication unit 210 and the core network 11.
　ＤＣ可否判定部２１１３は、収集部２１１２によって収集されたリソース情報に基づいて、それぞれの他の基地局２０について、ＤＣが可能か否かを判定する。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、選択部２１１４へ出力する。 The DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
　選択部２１１４は、他の基地局２０にＤＣが依頼される前に、それぞれの他の基地局２０について、ＤＣ可否判定部２１１３からＤＣ情報を取得する。そして、選択部２１１４は、ＤＣ可否判定部２１１３から出力されたそれぞれの他の基地局２０のＤＣ情報に基づいて、ＤＣが可能であることを示すＤＣ情報に対応する他の基地局２０の中から、ＤＣを依頼する他の基地局２０を選択する。選択部２１１４は、例えば、ＤＣが可能であることを示すＤＣ情報に対応する他の基地局２０の中から、信号の品質が良いセル２００を管理する基地局２０を、ＤＣを依頼する他の基地局２０として優先的に選択する。そして、選択部２１１４は、選択された他の基地局２０の情報をＤＣ処理部２１１５へ出力する。 The selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each of the other base stations 20 before DC is requested of the other base station 20. Based on the DC information of each of the other base stations 20 output from the DC availability determination unit 2113, the selection unit 2114 includes the other base stations 20 corresponding to the DC information indicating that DC is possible. The other base station 20 that requests DC is selected. For example, the selection unit 2114 requests other base stations 20 that manage the cell 200 with good signal quality from other base stations 20 corresponding to DC information indicating that DC is possible. The base station 20 is preferentially selected. Then, the selection unit 2114 outputs information on the selected other base station 20 to the DC processing unit 2115.
　ＤＣ処理部２１１５は、ＤＣを依頼する制御信号であるＤＣ要求を、通信部２１０およびコアネットワーク１１を介して、選択部２１１４によって選択された他の基地局２０へ送信する。そして、ＤＣ処理部２１１５は、選択部２１１４によって選択された他の基地局２０と連携してＤＣにより端末装置３０と無線通信を行う。ＤＣ処理部２１１５は、制御部の一例である。 The DC processing unit 2115 transmits a DC request, which is a control signal for requesting DC, to the other base station 20 selected by the selection unit 2114 via the communication unit 210 and the core network 11. Then, the DC processing unit 2115 performs wireless communication with the terminal device 30 through DC in cooperation with the other base station 20 selected by the selection unit 2114. The DC processing unit 2115 is an example of a control unit.
　無線通信制御部２１１６は、無線部２１３を介して、端末装置３０との間で、無線通信におけるプロトコルを制御する。無線通信制御部２１１６は、例えば、ＲＲＣレイヤ、ＰＤＣＰレイヤ、ＲＬＣレイヤ、およびＭＡＣレイヤの処理を実行する。ＲＲＣは、Radio　Resource　Controlの略であり、ＰＤＣＰは、Packet　Data　Convergence　Protocolの略であり、ＲＬＣは、Radio　Link　Controlの略であり、ＭＡＣは、Media　Access　Controlの略である。 The wireless communication control unit 2116 controls a protocol for wireless communication with the terminal device 30 via the wireless unit 213. The radio communication control unit 2116 executes, for example, RRC layer, PDCP layer, RLC layer, and MAC layer processing. RRC is an abbreviation for Radio Resource Control, PDCP is an abbreviation for Packet Data Convergence Protocol, RLC is an abbreviation for Radio Link Control, and MAC is an abbreviation for Media Access Control.
［基地局２０ｓ］
　図４は、実施例１においてセカンダリ基地局として機能する基地局２０ｓの一例を示すブロック図である。基地局２０ｓは、例えば図４に示されるように、通信部２１０、制御部２１１、メモリ２１２、無線部２１３、およびアンテナ２１４を備える。なお、図４において、図２と同じ符号が付されたブロックは、以下に説明する点を除き、図２において説明されたブロックと同様であるため、説明を省略する。 [Base station 20s]
FIG. 4 is a block diagram illustrating an example of a base station 20s that functions as a secondary base station in the first embodiment. For example, as illustrated in FIG. 4, the base station 20 s includes a communication unit 210, a control unit 211, a memory 212, a radio unit 213, and an antenna 214. In FIG. 4, blocks with the same reference numerals as those in FIG. 2 are the same as the blocks described in FIG.
　ＤＣ処理部２１１５は、基地局２０ｍと連携してＤＣにより端末装置３０と無線通信を行う。リソース管理部２１１７は、基地局２０ｓ内のリソースの状態を管理する。また、リソース管理部２１１７は、コアネットワーク１１および通信部２１０を介して基地局２０ｍからリソース情報要求を受信した場合、基地局２０ｓのリソース情報を、通信部２１０およびコアネットワーク１１を介して基地局２０ｍへ送信する。 The DC processing unit 2115 performs wireless communication with the terminal device 30 by DC in cooperation with the base station 20m. The resource management unit 2117 manages the state of resources in the base station 20s. When the resource management unit 2117 receives a resource information request from the base station 20 m via the core network 11 and the communication unit 210, the resource management unit 2117 transmits the resource information of the base station 20 s to the base station via the communication unit 210 and the core network 11. Send to 20m.
　なお、本実施例では、マスタ基地局として機能する基地局２０ｍと、セカンダリ基地局として機能する基地局２０ｓとが別々の装置として記載されているが、基地局２０ｍと基地局２０ｓとは同一の基地局２０として構成されてもよい。実施例２以降においても同様である。 In this embodiment, the base station 20m that functions as a master base station and the base station 20s that functions as a secondary base station are described as separate devices, but the base station 20m and the base station 20s are the same. The base station 20 may be configured. The same applies to the second and subsequent embodiments.
［端末装置３０］
　図５は、端末装置３０の一例を示すブロック図である。端末装置３０は、例えば図５に示されるように、アンテナ３１、無線部３２、制御部３３、およびメモリ３４を備える。 [Terminal device 30]
FIG. 5 is a block diagram illustrating an example of the terminal device 30. For example, as illustrated in FIG. 5, the terminal device 30 includes an antenna 31, a radio unit 32, a control unit 33, and a memory 34.
　無線部３２は、アンテナ３１を介して基地局２０から受信された信号、および、制御部３３から出力された信号に対して、例えば物理レイヤの処理を実行する。例えば、無線部３２は、アンテナ３１を介して基地局２０から受信された信号に対してフィルタリング、増幅、およびダウンコンバート等の処理を施す。そして、無線部３２は、処理後の信号をアナログ信号からデジタル信号に変換して制御部３３へ出力する。また、無線部３２は、制御部３３から出力された信号をデジタル信号からアナログ信号に変換する。そして、無線部３２は、変換後の信号に対してアップコンバート、増幅、およびフィルタリング等の処理を施し、処理後の送信信号を、アンテナ３１を介して基地局２０へ送信する。 The radio unit 32 executes, for example, physical layer processing on the signal received from the base station 20 via the antenna 31 and the signal output from the control unit 33. For example, the radio unit 32 performs processing such as filtering, amplification, and down-conversion on a signal received from the base station 20 via the antenna 31. The wireless unit 32 converts the processed signal from an analog signal to a digital signal and outputs the converted signal to the control unit 33. The radio unit 32 converts the signal output from the control unit 33 from a digital signal to an analog signal. Then, the radio unit 32 performs processes such as up-conversion, amplification, and filtering on the converted signal, and transmits the processed transmission signal to the base station 20 via the antenna 31.
　メモリ３４内には、制御部３３によって実行される各種プログラムやデータ等が格納される。制御部３３は、例えばＣＰＵまたはＤＳＰ等のプロセッサを有し、メモリ３４から読み出したプログラムを実行することにより制御部３３が有する各機能を実現する。 In the memory 34, various programs and data executed by the control unit 33 are stored. The control unit 33 has a processor such as a CPU or a DSP, for example, and implements each function of the control unit 33 by executing a program read from the memory 34.
　なお、メモリ３４内のプログラムやデータ等は、必ずしも全てが最初からメモリ３４内に記憶されていなくてもよい。例えば、端末装置３０に挿入されるメモリカードなどの可搬型記録媒体にプログラムやデータ等が記憶され、端末装置３０がこのような可搬型記録媒体からプログラムやデータ等を適宜取得して実行するようにしてもよい。また、プログラムやデータ等を記憶させた他のコンピュータまたはサーバ装置などから、無線通信回線、公衆回線、インターネット、ＬＡＮ、ＷＡＮなどを介して、端末装置３０がプログラム等を適宜取得して実行するようにしてもよい。 Note that not all programs, data, and the like in the memory 34 need be stored in the memory 34 from the beginning. For example, a program, data, or the like is stored in a portable recording medium such as a memory card inserted into the terminal device 30, and the terminal device 30 appropriately acquires the program, data, etc. from such a portable recording medium and executes it. It may be. In addition, the terminal device 30 appropriately acquires and executes the program or the like from another computer or server device that stores the program or data through a wireless communication line, a public line, the Internet, a LAN, a WAN, or the like. It may be.
　制御部３３は、メモリ３４から読み出したプログラムを実行することにより、測定部３３０、ＭＲ処理部３３１、ＤＣ処理部３３２、および無線通信制御部３３３の各機能を実現する。 The control unit 33 implements the functions of the measurement unit 330, the MR processing unit 331, the DC processing unit 332, and the wireless communication control unit 333 by executing the program read from the memory 34.
　測定部３３０は、周囲のセル２００において基地局２０から送信された信号の品質を測定する。 The measuring unit 330 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200.
　ＭＲ処理部３３１は、無線部３２を介して基地局２０からＭＲ要求を受信した場合に、測定部３３０からセル２００毎に信号の品質を示す品質情報を取得する。そして、ＭＲ処理部３３１は、セル２００毎の品質情報を含むＭＲを作成し、作成されたＭＲを、無線部３２を介して基地局２０へ送信する。 When the MR processing unit 331 receives an MR request from the base station 20 via the wireless unit 32, the MR processing unit 331 acquires quality information indicating the signal quality for each cell 200 from the measurement unit 330. Then, the MR processing unit 331 creates an MR including quality information for each cell 200 and transmits the created MR to the base station 20 via the radio unit 32.
　図６は、ＭＲ４０に含まれるデータの一例を示す図である。ＭＲ４０では、例えば図６に示されるように、それぞれのセル２００において基地局２０から送信された信号の品質情報が、セル２００を識別するセルＩＤに対応付けられている。信号の品質情報は、例えば、ＲＳＲＰ（Reference　Signal　Received　Power）、ＲＳＳＩ（Received　Signal　Strength　Indicator）、またはＲＳＲＱ（Reference　Signal　Received　Quality）等である。信号の品質情報は、無線回線品質の一例である。 FIG. 6 is a diagram illustrating an example of data included in the MR 40. In the MR 40, for example, as illustrated in FIG. 6, the quality information of the signal transmitted from the base station 20 in each cell 200 is associated with a cell ID that identifies the cell 200. The signal quality information is, for example, RSRP (Reference Signal Received Power), RSSI (Received Signal Strength Indicator), or RSRQ (Reference Signal Received Quality). The signal quality information is an example of radio channel quality.
　ＤＣ処理部３３２は、基地局２０ｍおよび基地局２０ｓとの間でＤＣにより無線通信を行う。無線通信制御部３３３は、無線部３２を介して、基地局２０との間で、無線通信におけるプロトコルを制御する。無線通信制御部３３３は、例えば、ＲＲＣレイヤ、ＰＤＣＰレイヤ、ＲＬＣレイヤ、およびＭＡＣレイヤの処理を実行する。 The DC processing unit 332 performs wireless communication by DC between the base station 20m and the base station 20s. The wireless communication control unit 333 controls a protocol for wireless communication with the base station 20 via the wireless unit 32. For example, the radio communication control unit 333 performs processing of the RRC layer, the PDCP layer, the RLC layer, and the MAC layer.
［無線通信システム１０の処理］
　図７は、実施例１における無線通信システム１０の処理の一例を示す図である。図７の例では、１台の端末装置３０と、マスタ基地局として機能する１台の基地局２０ｍと、セカンダリ基地局の候補として機能するｎ台の基地局２０ｓを含む無線通信システム１０が想定されている。 [Processing of Radio Communication System 10]
FIG. 7 is a diagram illustrating an example of processing of the wireless communication system 10 according to the first embodiment. In the example of FIG. 7, a radio communication system 10 including one terminal device 30, one base station 20m functioning as a master base station, and n base stations 20s functioning as secondary base station candidates is assumed. Has been.
　まず、マスタ基地局として機能する基地局２０ｍは、基地局２０ｍのリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定し、ＤＣにより端末装置３０との通信を実行することを決定する（Ｓ１００）。そして、基地局２０ｍは、無線信号により、ＭＲ要求を端末装置３０へ送信する（Ｓ１０１）。 First, the base station 20m functioning as a master base station determines whether or not to communicate with the terminal device 30 by DC based on the resource status of the base station 20m, and the DC communicates with the terminal device 30. It is determined to execute communication (S100). Then, the base station 20m transmits an MR request to the terminal device 30 using a radio signal (S101).
　端末装置３０は、ＭＲ要求を受信した場合、周囲のセル２００において基地局２０から送信された信号の品質を測定する。そして、端末装置３０は、周囲のセル２００毎の信号の品質を示す品質情報を含むＭＲを作成し、作成したＭＲを基地局２０ｍへ送信する（Ｓ１０２）。 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. And the terminal device 30 produces MR containing the quality information which shows the quality of the signal for every surrounding cell 200, and transmits produced MR to the base station 20m (S102).
　基地局２０ｍは、端末装置３０からＭＲを受信した場合、ＭＲに含まれるセル２００毎の品質情報に基づいて、リソース情報要求の送信先の基地局２０ｓを１つ以上特定する（Ｓ１０３）。そして、基地局２０ｍは、特定された基地局２０ｓにコアネットワーク１１を介してリソース情報要求を送信する（Ｓ１０４）。リソース情報要求は、例えばマルチキャストで送信される。 When the base station 20m receives the MR from the terminal device 30, the base station 20m specifies one or more base stations 20s as the transmission destination of the resource information request based on the quality information for each cell 200 included in the MR (S103). Then, the base station 20m transmits a resource information request to the identified base station 20s via the core network 11 (S104). The resource information request is transmitted by multicast, for example.
　それぞれの基地局２０ｓは、コアネットワーク１１を介して基地局２０ｍからリソース情報要求を受信した場合、基地局２０ｓのリソース情報を、コアネットワーク１１を介して基地局２０ｍへ送信する（Ｓ１０５－１～１０５－ｎ）。 When each base station 20s receives a resource information request from the base station 20m via the core network 11, the base station 20s transmits the resource information of the base station 20s to the base station 20m via the core network 11 (S105-1 to S105-1). 105-n).
　基地局２０ｍは、コアネットワーク１１を介して、基地局２０ｓから送信されたリソース情報を収集する。そして、基地局２０ｍは、収集されたリソース情報に基づいて、それぞれの基地局２０ｓについて、ＤＣが可能か否かを判定する（Ｓ１０６）。 The base station 20m collects resource information transmitted from the base station 20s via the core network 11. Then, the base station 20m determines whether DC is possible for each base station 20s based on the collected resource information (S106).
　そして、基地局２０ｍは、ＤＣが可能である基地局２０ｓの中から、ＤＣを依頼するための制御信号であるＤＣ要求の送信先となる基地局２０ｓを選択する（Ｓ１０７）。基地局２０ｍは、例えば、ＤＣが可能である基地局２０ｓの中から、信号の品質が最も良いセル２００を管理する基地局２０ｓを、ＤＣを依頼する基地局２０ｓとして選択する。図７の例では、基地局２０ｓ－１が、ＤＣが可能である基地局２０ｓの中で、信号の品質が最も良い基地局２０ｓである。 Then, the base station 20m selects a base station 20s that is a transmission destination of a DC request, which is a control signal for requesting DC, from the base stations 20s capable of DC (S107). The base station 20m selects, for example, the base station 20s that manages the cell 200 having the best signal quality as the base station 20s that requests DC from among the base stations 20s that can perform DC. In the example of FIG. 7, the base station 20s-1 is the base station 20s having the best signal quality among the base stations 20s capable of DC.
　そして、基地局２０ｍは、ＤＣ要求を、ステップＳ１０７において選択された基地局２０ｓ（例えば、基地局２０ｓ－１）へコアネットワーク１１を介して送信する（Ｓ１０８）。ＤＣ要求を受信した基地局２０ｓ－１は、ＤＣ要求を受け入れることを示すＡＣＫ（ACKnowledgement）を、コアネットワーク１１を介して基地局２０ｍへ送信する。そして、基地局２０ｍと基地局２０ｓ－１とは、連携してＤＣにより端末装置３０との無線通信を実行する。 Then, the base station 20m transmits the DC request to the base station 20s (for example, the base station 20s-1) selected in step S107 via the core network 11 (S108). The base station 20s-1 that has received the DC request transmits an ACK (ACKnowledgement) indicating acceptance of the DC request to the base station 20m via the core network 11. Then, the base station 20m and the base station 20s-1 cooperate to execute wireless communication with the terminal device 30 by DC.
［実施例１の効果］
　以上、実施例１について説明した。上記したように、本実施例の基地局２０ｍは、選択部２１１４と、ＤＣ処理部２１１５とを有する。選択部２１１４は、基地局２０ｓにＤＣを依頼する前に、ＤＣが可能か否かを示すＤＣ情報を複数の基地局２０ｓのそれぞれについて取得する。そして、選択部２１１４は、ＤＣが可能であることを示すＤＣ情報に対応する基地局２０ｓの中から、ＤＣを依頼する基地局２０ｓを選択する。ＤＣ処理部２１１５は、選択部２１１４によって選択された基地局２０ｓにＤＣを依頼する制御信号を送信する。 [Effect of Example 1]
In the above, Example 1 was demonstrated. As described above, the base station 20m of this embodiment includes the selection unit 2114 and the DC processing unit 2115. The selection unit 2114 obtains DC information indicating whether or not DC is possible for each of the plurality of base stations 20s before requesting the DC to the base station 20s. Then, the selection unit 2114 selects the base station 20s that requests DC from the base stations 20s corresponding to DC information indicating that DC is possible. The DC processing unit 2115 transmits a control signal requesting DC to the base station 20s selected by the selection unit 2114.
　ここで、基地局２０ｍが、ＤＣが可能であるか否かに関わらず、基地局２０ｓへＤＣ要求を送信するとすれば、基地局２０ｓのリソースの状態によっては、ＤＣ要求が拒否される場合がある。ＤＣ要求が拒否された場合、基地局２０ｍは、ＤＣを受け入れる基地局２０ｓを見つけるために、他の基地局２０ｓにＤＣ要求を送信する。そして、ＤＣ要求の拒否が繰り返されると、ＤＣが確立されるまでに時間がかかり、端末装置３０との間の無線通信の伝送速度を上げることが難しい。 Here, if the base station 20m transmits a DC request to the base station 20s regardless of whether or not DC is possible, the DC request may be rejected depending on the resource state of the base station 20s. is there. When the DC request is rejected, the base station 20m transmits the DC request to the other base station 20s in order to find the base station 20s that accepts the DC. If the rejection of the DC request is repeated, it takes time until the DC is established, and it is difficult to increase the transmission speed of wireless communication with the terminal device 30.
　これに対し、本実施例の基地局２０は、他の基地局２０にＤＣ要求を送信する前に、それぞれの他の基地局２０について、ＤＣが可能である他の基地局２０を特定する。そして、基地局２０は、ＤＣが可能である他の基地局２０の中から、ＤＣを依頼する他の基地局２０を選択する。これにより、本実施例の基地局２０は、ＤＣ要求が受け入れられる可能性を高めることができ、ＤＣをより迅速に確立することができる。 On the other hand, before transmitting the DC request to the other base stations 20, the base station 20 of the present embodiment identifies the other base stations 20 capable of DC for each of the other base stations 20. Then, the base station 20 selects another base station 20 that requests DC from among the other base stations 20 capable of DC. Thereby, the base station 20 of a present Example can raise possibility that a DC request | requirement will be accepted, and can establish DC more rapidly.
　また、上記した実施例１の基地局２０において、選択部２１１４は、ＤＣが可能であることを示すＤＣ情報に対応する他の基地局２０の中で、ＤＣによって送信されるデータを受信する端末装置３０において測定された信号の品質が良いセルを管理する他の基地局２０を、ＤＣを依頼する他の基地局２０として優先的に選択する。これにより、本実施例の基地局２０は、他の基地局２０と連携してＤＣによる無線通信を、より安定して提供することができる。 In the base station 20 of the first embodiment described above, the selection unit 2114 receives the data transmitted by the DC among the other base stations 20 corresponding to the DC information indicating that the DC is possible. The other base station 20 that manages a cell with a good signal quality measured by the device 30 is preferentially selected as another base station 20 that requests DC. Thereby, the base station 20 of a present Example can provide the radio | wireless communication by DC more stably in cooperation with the other base station 20. FIG.
　また、上記した実施例１における基地局２０は、収集部２１１２およびＤＣ可否判定部２１１３を有する。収集部２１１２は、他の基地局２０のリソースの状態を示すリソース情報を、それぞれの他の基地局２０から収集する。ＤＣ可否判定部２１１３は、リソース情報に基づいて、それぞれの他の基地局２０について、ＤＣが可能か否かを判定し、判定結果を示すＤＣ情報を選択部２１１４へ出力する。これにより、選択部２１１４は、ＤＣが可能か否かを示すＤＣ情報を複数の基地局２０ｓのそれぞれについて取得することができる。 In addition, the base station 20 in the first embodiment includes the collection unit 2112 and the DC availability determination unit 2113. The collection unit 2112 collects resource information indicating the state of the resources of the other base stations 20 from each of the other base stations 20. The DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information, and outputs DC information indicating the determination result to the selection unit 2114. Thereby, the selection unit 2114 can acquire DC information indicating whether or not DC is possible for each of the plurality of base stations 20s.
　また、上記した実施例１における基地局２０は、要求部２１１１を備える。要求部２１１１は、例えば、端末装置３０において測定された信号の品質が良い順に所定数のセル２００について、それぞれのセル２００を管理する他の基地局２０に、リソース情報を要求する。これにより、本実施例の基地局２０は、他の基地局２０と連携してＤＣによる無線通信をより安定して提供することができると共に、リソース情報の伝送による通信トラフィックを抑制することができる。 In addition, the base station 20 in the first embodiment described above includes a request unit 2111. For example, the request unit 2111 requests resource information from other base stations 20 that manage each cell 200 for a predetermined number of cells 200 in order of good signal quality measured by the terminal device 30. Thereby, the base station 20 of the present embodiment can provide more stable wireless communication by DC in cooperation with other base stations 20, and can suppress communication traffic due to transmission of resource information. .
　また、上記した実施例１において、要求部２１１１は、例えば、端末装置３０において測定された信号の品質が所定の品質より良いセル２００について、それぞれのセル２００を管理する他の基地局２０に、リソース情報を要求してもよい。これにより、本実施例の基地局２０は、他の基地局２０と連携してＤＣによる無線通信をより安定して提供することができると共に、リソース情報の伝送による通信トラフィックを抑制することができる。 In the first embodiment described above, the request unit 2111 transmits, for example, a cell 200 whose signal quality measured by the terminal device 30 is better than a predetermined quality to other base stations 20 that manage each cell 200. Resource information may be requested. Thereby, the base station 20 of the present embodiment can provide more stable wireless communication by DC in cooperation with other base stations 20, and can suppress communication traffic due to transmission of resource information. .
　実施例１では、マスタ基地局として機能する基地局２０ｍが、セカンダリ基地局の候補として機能する基地局２０ｓから収集されたリソース情報に基づいて、それぞれの基地局２０ｓについてＤＣの可否を判定した。これに対し、本実施例２では、それぞれの基地局２０ｓがＤＣの可否を判定し、基地局２０ｍは、それぞれの基地局２０ｓによる判定結果に基づいて、ＤＣを依頼する基地局２０ｓを選択する点が、実施例１とは異なる。なお、無線通信システム１０の構成は、図１を用いて説明した実施例１の無線通信システム１０と同様であるため、詳細な説明を省略する。 In Example 1, the base station 20m that functions as a master base station determines whether or not DC is possible for each base station 20s based on the resource information collected from the base station 20s that functions as a candidate for a secondary base station. On the other hand, in the second embodiment, each base station 20s determines whether or not DC is possible, and the base station 20m selects the base station 20s that requests DC based on the determination result by each base station 20s. This is different from the first embodiment. The configuration of the wireless communication system 10 is the same as that of the wireless communication system 10 according to the first embodiment described with reference to FIG.
［基地局２０ｍ］
　図８は、実施例２においてマスタ基地局として機能する基地局２０ｍの一例を示すブロック図である。なお、以下に説明する点を除き、図８において、図２と同じ符号が付されたブロックは、図２におけるブロックと同一または同様の機能を有するため説明を省略する。本実施例２における基地局２０ｍの制御部２１１は、メモリ２１２から読み出したプログラムを実行することにより、ＤＣ実行判定部２１１０、要求部２１１１、選択部２１１４、ＤＣ処理部２１１５、および無線通信制御部２１１６の各機能を実現する。 [Base station 20m]
FIG. 8 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the second embodiment. Except for the points described below, in FIG. 8, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG. The control unit 211 of the base station 20m in the second embodiment executes a program read from the memory 212, thereby executing a DC execution determination unit 2110, a request unit 2111, a selection unit 2114, a DC processing unit 2115, and a wireless communication control unit. Each function of 2116 is realized.
　要求部２１１１は、無線部２１３を介して端末装置３０からＭＲを受信した場合、ＭＲに含まれるセル２００毎の品質情報に基づいて、ＤＣが可能か否かの判定を要求する他の基地局２０を１つ以上特定する。 When the request unit 2111 receives an MR from the terminal device 30 via the radio unit 213, the request unit 2111 requests another base station that determines whether or not DC is possible based on the quality information for each cell 200 included in the MR. One or more 20 are specified.
　そして、要求部２１１１は、特定された基地局２０に、通信部２１０およびコアネットワーク１１を介して、ＤＣが可能か否かの判定を要求するＤＣ判定要求を送信する。ＤＣ判定要求には、ＤＣにより基地局２０ｍと分け合う通信トラフィックに関する情報等が含まれる。ＤＣ判定要求は、例えばマルチキャストで送信される。 Then, the request unit 2111 transmits a DC determination request for requesting determination of whether or not DC is possible, to the identified base station 20 via the communication unit 210 and the core network 11. The DC determination request includes information related to communication traffic shared with the base station 20m by DC. The DC determination request is transmitted by multicast, for example.
　選択部２１１４は、それぞれの他の基地局２０から、ＤＣが可能であるか否かを示すＤＣ情報を取得する。ＤＣ情報は、他の基地局２０にＤＣが依頼される前に、それぞれの他の基地局２０から取得される。そして、選択部２１１４は、取得されたそれぞれの他の基地局２０のＤＣ情報に基づいて、ＤＣが可能であることを示すＤＣ情報に対応する他の基地局２０の中から、ＤＣを依頼する他の基地局２０を選択する。 The selection unit 2114 acquires DC information indicating whether or not DC is possible from each of the other base stations 20. The DC information is acquired from each other base station 20 before DC is requested to the other base station 20. Then, the selection unit 2114 requests DC from the other base stations 20 corresponding to the DC information indicating that DC is possible based on the acquired DC information of each other base station 20. Another base station 20 is selected.
［基地局２０ｓ］
　図９は、実施例２においてセカンダリ基地局として機能する基地局２０ｓの一例を示すブロック図である。なお、以下に説明する点を除き、図９において、図４と同じ符号が付されたブロックは、図４におけるブロックと同一または同様の機能を有するため説明を省略する。本実施例２における基地局２０ｓの制御部２１１は、メモリ２１２から読み出したプログラムを実行することにより、ＤＣ可否判定部２１１３、ＤＣ処理部２１１５、無線通信制御部２１１６、およびリソース管理部２１１７の各機能を実現する。 [Base station 20s]
FIG. 9 is a block diagram illustrating an example of a base station 20s that functions as a secondary base station in the second embodiment. Except for the points described below, in FIG. 9, blocks denoted by the same reference numerals as those in FIG. 4 have the same or similar functions as the blocks in FIG. The control unit 211 of the base station 20 s in the second embodiment executes each program of the DC availability determination unit 2113, the DC processing unit 2115, the wireless communication control unit 2116, and the resource management unit 2117 by executing the program read from the memory 212. Realize the function.
　ＤＣ可否判定部２１１３は、基地局２０ｍからＤＣ判定要求を受信した場合、自装置内のリソースの状態に基づいて、ＤＣが可能か否かを判定する。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、通信部２１０およびコアネットワーク１１を介して基地局２０ｍへ送信する。ＤＣ情報には、ＤＣが可能か否かを示す情報の他に、各リソースの空き状況を示す情報が含まれていてもよい。これにより、ＤＣ情報を受け取った基地局２０ｍは、ＤＣが可能な他の基地局２０の中で、リソースに余裕がある基地局２０を優先的に選択することができる。 When receiving a DC determination request from the base station 20m, the DC availability determination unit 2113 determines whether or not DC is possible based on the state of the resource in the own device. Then, the DC availability determination unit 2113 transmits DC information indicating the determination result to the base station 20m via the communication unit 210 and the core network 11. The DC information may include information indicating availability of each resource in addition to information indicating whether or not DC is possible. As a result, the base station 20m that has received the DC information can preferentially select the base station 20 with sufficient resources among other base stations 20 capable of DC.
［無線通信システム１０の処理］
　図１０は、実施例２における無線通信システム１０の処理の一例を示す図である。なお、以下に説明する点を除き、図１０において、図７と同じ符号が付された処理は、図７において説明された処理と同様であるため説明を省略する。 [Processing of Radio Communication System 10]
FIG. 10 is a diagram illustrating an example of processing of the wireless communication system 10 according to the second embodiment. Except for the points described below, in FIG. 10, the processes denoted by the same reference numerals as those in FIG. 7 are the same as the processes described in FIG.
　端末装置３０からＭＲを受信した場合、基地局２０ｍは、ＭＲに含まれるセル２００毎の品質情報に基づいて、ＤＣ判定要求の送信先の基地局２０ｓを１つ以上特定する（Ｓ１１０）。そして、基地局２０ｍは、特定された基地局２０ｓにコアネットワーク１１を介してＤＣ判定要求を送信する（Ｓ１１１）。ＤＣ判定要求は、例えばマルチキャストで送信される。 When the MR is received from the terminal device 30, the base station 20m specifies one or more base stations 20s that are transmission destinations of the DC determination request based on the quality information for each cell 200 included in the MR (S110). Then, the base station 20m transmits a DC determination request to the identified base station 20s via the core network 11 (S111). The DC determination request is transmitted by multicast, for example.
　ＤＣ判定要求を受信したそれぞれの基地局２０ｓは、自装置内のリソースの状態に基づいて、ＤＣが可能か否かを判定する（Ｓ１１２－１～１１２－ｎ）。そして、それぞれの基地局２０ｓは、判定結果を示すＤＣ情報を、コアネットワーク１１を介して基地局２０ｍへ送信する（Ｓ１１３－１～１１３－ｎ）。そして、ステップＳ１０７以降の処理が実行される。 Each base station 20s that has received the DC determination request determines whether or not DC is possible based on the state of the resource in the own device (S112-1 to 112-n). Then, each base station 20s transmits DC information indicating the determination result to the base station 20m via the core network 11 (S113-1 to 113-n). And the process after step S107 is performed.
［実施例２の効果］
　以上、実施例２について説明した。上記したように、本実施例では、要求部２１１１が、ＤＣが可能か否かの判定を要求するＤＣ判定要求を、それぞれの他の基地局２０へ送信する。そして、選択部２１１４は、他の基地局２０からＤＣ情報を取得する。これにより、ＤＣが可能か否かの判定を行う処理をそれぞれの他の基地局２０に分散させることができる。 [Effect of Example 2]
The example 2 has been described above. As described above, in the present embodiment, the request unit 2111 transmits a DC determination request for requesting determination of whether or not DC is possible to each of the other base stations 20. Then, the selection unit 2114 acquires DC information from the other base station 20. Thereby, the process of determining whether or not DC is possible can be distributed to each of the other base stations 20.
　また、実施例２において、ＤＣ判定要求には、ＤＣにおいて他の基地局２０に割り当てられる通信トラフィックに関する情報が含まれていてもよい。これにより、ＤＣ判定要求を受信した他の基地局２０は、ＤＣが可能か否かの判定をより精度よく実行することができる。 Further, in the second embodiment, the DC determination request may include information regarding communication traffic assigned to another base station 20 in the DC. Thereby, the other base station 20 which received DC determination request | requirement can perform the determination whether DC is possible more accurately.
　実施例１では、ＤＣの実行が決定された場合に、マスタ基地局として機能する基地局２０ｍが、他の基地局２０からリソース情報を収集し、収集されたリソース情報に基づいて、ＤＣを依頼する他の基地局２０を決定した。これに対し、本実施例３では、ＤＣの実行が決定される前に、それぞれの基地局２０が他の基地局２０からリソース情報を収集し、ＤＣの実行が決定された場合に、収集されたリソース情報に基づいて、ＤＣを依頼する他の基地局２０が決定される。なお、無線通信システム１０の構成は、図１を用いて説明した実施例１の無線通信システム１０と同様であるため、詳細な説明を省略する。 In the first embodiment, when execution of DC is determined, the base station 20m functioning as a master base station collects resource information from other base stations 20, and requests DC based on the collected resource information. Other base stations 20 to be determined have been determined. On the other hand, in the third embodiment, each base station 20 collects resource information from other base stations 20 before the execution of DC is decided, and is collected when the execution of DC is decided. Based on the resource information, another base station 20 that requests DC is determined. The configuration of the wireless communication system 10 is the same as that of the wireless communication system 10 according to the first embodiment described with reference to FIG.
［基地局２０ｍ］
　図１１は、実施例３においてマスタ基地局として機能する基地局２０ｍの一例を示すブロック図である。なお、以下に説明する点を除き、図１１において、図２と同じ符号が付されたブロックは、図２におけるブロックと同一または同様の機能を有するため説明を省略する。 [Base station 20m]
FIG. 11 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the third embodiment. Except for the points described below, in FIG. 11, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG.
　本実施例３における基地局２０ｍのメモリ２１２には、基地局情報２１２０およびリソース情報２１２１が格納される。リソース情報２１２１には、他の基地局２０から収集されたリソース情報がセルＩＤに対応付けて格納される。 In the memory 212 of the base station 20m in the third embodiment, base station information 2120 and resource information 2121 are stored. Resource information 2121 stores resource information collected from other base stations 20 in association with cell IDs.
　制御部２１１は、メモリ２１２から読み出したプログラムを実行することにより、ＤＣ実行判定部２１１０、収集部２１１２、ＤＣ可否判定部２１１３、選択部２１１４、ＤＣ処理部２１１５、および無線通信制御部２１１６の各機能を実現する。 The control unit 211 executes each of the DC execution determination unit 2110, the collection unit 2112, the DC availability determination unit 2113, the selection unit 2114, the DC processing unit 2115, and the wireless communication control unit 2116 by executing the program read from the memory 212. Realize the function.
　収集部２１１２は、ＤＣ実行判定部２１１０によってＤＣにより端末装置３０との通信を実行すると判定される前に、通信部２１０およびコアネットワーク１１を介して、他の基地局２０から送信されたリソース情報を収集する。そして、収集部２１１２は、収集されたリソース情報をメモリ２１２内のリソース情報２１２１に格納する。 The collection unit 2112 receives the resource information transmitted from the other base station 20 via the communication unit 210 and the core network 11 before the DC execution determination unit 2110 determines to perform communication with the terminal device 30 by DC. To collect. Then, the collection unit 2112 stores the collected resource information in the resource information 2121 in the memory 212.
　ＤＣ可否判定部２１１３は、ＤＣ実行判定部２１１０によってＤＣにより端末装置３０との通信を実行すると判定された場合、リソース情報２１２１に格納された他の基地局２０のリソース情報を参照する。そして、ＤＣ可否判定部２１１３は、リソース情報２１２１に格納されたリソース情報に基づいて、それぞれの他の基地局２０について、ＤＣが可能か否かを判定する。ＤＣ可否判定部２１１３は、ＤＣ実行判定部２１１０によってＤＣにより端末装置３０との通信を実行すると判定された場合、例えばリソース情報２１２１に格納されたそれぞれの他の基地局２０の最新のリソース情報に基づいて、ＤＣが可能か否かを判定する。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、選択部２１１４へ出力する。 The DC availability determination unit 2113 refers to the resource information of the other base station 20 stored in the resource information 2121 when the DC execution determination unit 2110 determines that communication with the terminal device 30 is to be executed by DC. Then, the DC availability determination unit 2113 determines whether or not DC is possible for each of the other base stations 20 based on the resource information stored in the resource information 2121. When the DC execution determination unit 2110 determines that the DC execution determination unit 2110 performs communication with the terminal device 30 by DC, for example, the DC availability determination unit 2113 uses the latest resource information of each other base station 20 stored in the resource information 2121, for example. Based on this, it is determined whether or not DC is possible. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
［基地局２０ｓ］
　本実施例における基地局２０ｓの構成は、図４と同様である。そのため、以下では、図４を参照して説明を行う。なお、以下に説明する点を除き、図４を用いて説明したブロックについては、実施例１の基地局２０ｓと同様であるため、詳細な説明を省略する。 [Base station 20s]
The configuration of the base station 20s in the present embodiment is the same as that in FIG. Therefore, the following description will be given with reference to FIG. Except for the points described below, the blocks described using FIG. 4 are the same as those of the base station 20s according to the first embodiment, and thus detailed description thereof is omitted.
　リソース管理部２１１７は、所定のタイミング毎に、通信部２１０およびコアネットワーク１１を介して、リソース情報を基地局２０ｍへ送信する。所定のタイミングとは、例えば、それぞれの他の基地局２０において、他の基地局２０のリソースの状態が所定量以上変化したタイミングでる。これにより、リソース情報の収集における通信トラフィックを削減することができる。なお、所定のタイミングとは、定期的なタイミングであってもよい。 The resource management unit 2117 transmits resource information to the base station 20m via the communication unit 210 and the core network 11 at every predetermined timing. The predetermined timing is, for example, a timing at which each other base station 20 changes the resource state of the other base station 20 by a predetermined amount or more. Thereby, the communication traffic in the collection of resource information can be reduced. The predetermined timing may be a periodic timing.
［無線通信システム１０の処理］
　図１２は、実施例３における無線通信システム１０の処理の一例を示す図である。なお、以下に説明する点を除き、図１２において、図７と同じ符号が付された処理は、図７において説明された処理と同様であるため説明を省略する。 [Processing of Radio Communication System 10]
FIG. 12 is a diagram illustrating an example of processing of the wireless communication system 10 according to the third embodiment. Except for the points described below, in FIG. 12, the processes denoted by the same reference numerals as those in FIG. 7 are the same as the processes described in FIG.
　それぞれの基地局２０ｓは、リソースの状態が所定量以上変化したことを検出した場合（Ｓ１２０－１～１２０－ｎ）、リソース情報を、コアネットワーク１１を介して基地局２０ｍへ送信する（Ｓ１２１－１～１２０－ｎ）。 When each base station 20s detects that the state of the resource has changed by a predetermined amount or more (S120-1 to 120-n), the base station 20s transmits the resource information to the base station 20m via the core network 11 (S121- 1-120-n).
　基地局２０ｍは、ＤＣにより端末装置３０との通信を実行する決定した場合（Ｓ１００）、無線信号により、ＭＲ要求を端末装置３０へ送信する（Ｓ１０１）。端末装置３０は、周囲のセル２００において基地局２０から送信された信号の品質を測定し、周囲のセル２００毎の品質情報を含むＭＲを基地局２０ｍへ送信する（Ｓ１０２）。 When the base station 20m determines to execute communication with the terminal device 30 by DC (S100), the base station 20m transmits an MR request to the terminal device 30 by a radio signal (S101). The terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200, and transmits the MR including the quality information for each surrounding cell 200 to the base station 20m (S102).
　次に、基地局２０ｍは、それぞれの基地局２０ｓから収集された最新のリソース情報に基づいて、それぞれの基地局２０ｓについて、ＤＣが可能か否かを判定する（Ｓ１０６）。そして、ステップＳ１０７以降の処理が実行される。なお、ステップＳ１０６の処理は、ステップＳ１０１の処理より前に実行されてもよく、ステップＳ１０１の処理と並行して実行されてもよい。 Next, the base station 20m determines whether or not DC is possible for each base station 20s based on the latest resource information collected from each base station 20s (S106). And the process after step S107 is performed. In addition, the process of step S106 may be performed before the process of step S101, and may be performed in parallel with the process of step S101.
［実施例３の効果］
　以上、実施例３について説明した。上記したように、本実施例において、ＤＣ実行判定部２１１０は、ＤＣにより端末装置３０との通信を実行するか否かを判定する。収集部２１１２は、ＤＣ実行判定部２１１０によってＤＣにより端末装置３０との通信を実行すると判定される前に、他の基地局２０のリソース情報を、それぞれの他の基地局２０から収集する。ＤＣ可否判定部２１１３は、ＤＣ実行判定部２１１０によってＤＣにより端末装置３０との通信を実行すると判定された場合、収集部２１１２によって収集されたそれぞれの他の基地局２０の最新のリソース情報に基づいて、ＤＣが可能か否かを判定する。これにより、ＤＣ可否判定部２１１３は、それぞれの他の基地局２０について、より迅速にＤＣが可能か否かを判定することができる。 [Effect of Example 3]
The example 3 has been described above. As described above, in this embodiment, the DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC. The collection unit 2112 collects the resource information of the other base stations 20 from each of the other base stations 20 before the DC execution determination unit 2110 determines that communication with the terminal device 30 is to be performed by DC. When the DC execution determination unit 2110 determines that the DC execution determination unit 2110 performs communication with the terminal device 30 by DC, the DC availability determination unit 2113 is based on the latest resource information of each other base station 20 collected by the collection unit 2112. Then, it is determined whether or not DC is possible. Thereby, the DC availability determination unit 2113 can determine whether or not DC is possible for each of the other base stations 20 more quickly.
　また、上記した実施例３において、収集部２１１２は、それぞれの他の基地局２０において、他の基地局２０のリソースの状態が所定量以上変化した場合に、リソース情報を収集する。これにより、リソース情報の収集における通信トラフィックを削減することができる。 In the above-described third embodiment, the collection unit 2112 collects resource information in each of the other base stations 20 when the resource state of the other base station 20 changes by a predetermined amount or more. Thereby, the communication traffic in the collection of resource information can be reduced.
　上記した実施例１～３では、基地局２０が１台の装置により実現された。これに対し、本実施例では、それぞれの基地局２０が、少なくとも１台のＣＵ（Central　Unit）および１台のＤＵ（Distributed　Unit）を含む複数の装置により実現される点が実施例１～３とは異なる。 In the above-described Examples 1 to 3, the base station 20 is realized by a single device. In contrast, in this embodiment, each base station 20 is realized by a plurality of devices including at least one CU (Central Unit) and one DU (Distributed Unit). Is different.
［無線通信システム１０］
　図１３は、実施例４における無線通信システム１０の一例を示す図である。無線通信システム１０は、複数の基地局２０と、端末装置３０とを備える。それぞれの基地局２０は、コアネットワーク１１に接続されており、端末装置３０の無線接続を制御し、端末装置３０とコアネットワーク１１との間の通信を中継する。 [Wireless communication system 10]
FIG. 13 is a diagram illustrating an example of the wireless communication system 10 according to the fourth embodiment. The wireless communication system 10 includes a plurality of base stations 20 and a terminal device 30. Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11.
　基地局２０－１は、ＣＵ２２－１および複数のＤＵ２３－１～２３－３を有し、基地局２０－２は、ＣＵ２２－２および複数のＤＵ２３－４～２３－６を有する。本実施例において、複数のＤＵ２３－１～２３－３は、セル２００－１を形成し、複数のＤＵ２３－４～２３－５は、セル２００－２を形成し、ＤＵ２３－６は、セル２００－３を形成する。なお、以下では、複数のＤＵ２３－１～２３－６のそれぞれを区別することなく総称する場合にＤＵ２３と記載する。それぞれのＣＵ２２は、通信制御装置の一例であり、それぞれのＤＵ２３は、無線装置の一例である。 The base station 20-1 has a CU 22-1 and a plurality of DUs 23-1 to 23-3, and the base station 20-2 has a CU 22-2 and a plurality of DUs 23-4 to 23-6. In this embodiment, the plurality of DUs 23-1 to 23-3 form a cell 200-1, the plurality of DUs 23-4 to 23-5 form a cell 200-2, and the DU 23-6 includes a cell 200-1. -3. Hereinafter, each of the plurality of DUs 23-1 to 23-6 is collectively referred to as DU23 without being distinguished. Each CU 22 is an example of a communication control device, and each DU 23 is an example of a wireless device.
　また、図１３の例では、無線通信システム１０が２つの基地局２０を有するが、無線通信システム１０は、３つ以上の基地局２０を有していてもよい。また、図１３の例では、１つの基地局２０に１つのＣＵ２２と、３つのＤＵ２３とが含まれるが、１つの基地局２０に含まれるＣＵ２２およびＤＵ２３の数はこれに限られない。それぞれのＣＵ２２は、例えばＢＢＵ等の制御装置により実現され、それぞれの２３は、例えばＲＲＨ等の無線装置により実現される。 In the example of FIG. 13, the wireless communication system 10 includes two base stations 20, but the wireless communication system 10 may include three or more base stations 20. In the example of FIG. 13, one base station 20 includes one CU 22 and three DUs 23, but the number of CUs 22 and DUs 23 included in one base station 20 is not limited to this. Each CU 22 is realized by a control device such as BBU, and each 23 is realized by a radio device such as RRH.
［基地局２０ｍ］
　図１４は、実施例４においてマスタ基地局として機能する基地局２０ｍの一例を示すブロック図である。基地局２０ｍのＣＵ２２は、例えば図１４に示されるように、通信部２２０、制御部２２１、メモリ２２２、および通信部２２３を有する。なお、以下に説明する点を除き、図１４において、図２と同じ符号が付されたブロックは、図２におけるブロックと同一または同様の機能を有するため説明を省略する。 [Base station 20m]
FIG. 14 is a block diagram illustrating an example of a base station 20m that functions as a master base station in the fourth embodiment. For example, as illustrated in FIG. 14, the CU 22 of the base station 20 m includes a communication unit 220, a control unit 221, a memory 222, and a communication unit 223. Except for the points described below, in FIG. 14, blocks denoted by the same reference numerals as those in FIG. 2 have the same or similar functions as the blocks in FIG.
　メモリ２２２内には、例えば図１５に示されるような基地局情報２１２０が格納される。図１５は、実施例４における基地局情報２１２０の一例を示す図である。本実施例における基地局情報２１２０には、セルＩＤに対応付けて、ＣＵ＿ＩＤ、アクセス情報、およびＤＵ＿ＩＤが格納される。ＣＵ＿ＩＤは、対応付けられたセルＩＤのセル２００を管理するＤＵ２３を管理するＣＵ２２を識別する情報である。アクセス情報は、対応するＣＵ＿ＩＤで識別されるＣＵ２２にアクセスするための情報であり、例えばアドレス情報等である。ＤＵ＿ＩＤは、対応付けられたセルＩＤのセル２００を管理するＤＵ２３を識別する情報である。なお、１つのセル２００が複数のＤＵ２３によって形成される場合、１つのセルＩＤに対して、ＤＵ＿ＩＤが複数対応付けられる。基地局情報２１２０は、基地局２０の管理者等により、予めメモリ２２２内に格納される。また、メモリ２２２内には、制御部２２１によって実行される各種プログラム等が格納される。 In the memory 222, for example, base station information 2120 as shown in FIG. 15 is stored. FIG. 15 is a diagram illustrating an example of the base station information 2120 according to the fourth embodiment. In the base station information 2120 in this embodiment, CU_ID, access information, and DU_ID are stored in association with the cell ID. The CU_ID is information for identifying the CU 22 that manages the DU 23 that manages the cell 200 having the associated cell ID. The access information is information for accessing the CU 22 identified by the corresponding CU_ID, such as address information. The DU_ID is information for identifying the DU 23 that manages the cell 200 having the associated cell ID. When one cell 200 is formed by a plurality of DUs 23, a plurality of DU_IDs are associated with one cell ID. The base station information 2120 is stored in the memory 222 in advance by an administrator of the base station 20 or the like. The memory 222 stores various programs executed by the control unit 221.
　制御部２２１は、メモリ２２２から読み出したプログラムを実行することにより、ＤＣ実行判定部２１１０、要求部２１１１、収集部２１１２、ＤＣ可否判定部２１１３、選択部２１１４、ＤＣ処理部２１１５、および無線通信制御部２１１６の各機能を実現する。 The control unit 221 executes a program read from the memory 222, thereby executing a DC execution determination unit 2110, a request unit 2111, a collection unit 2112, a DC availability determination unit 2113, a selection unit 2114, a DC processing unit 2115, and a wireless communication control. Each function of the unit 2116 is realized.
　ＤＣ実行判定部２１１０は、ＤＣにより端末装置３０との通信を実行するか否かを判定する。ＤＣ実行判定部２１１０は、例えば基地局２０が有するＣＵ２２およびそれぞれのＤＵ２３のリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。 The DC execution determination unit 2110 determines whether or not communication with the terminal device 30 is executed by DC. The DC execution determination unit 2110 determines whether or not to perform communication with the terminal device 30 by DC based on, for example, the resource statuses of the CU 22 and the respective DUs 23 included in the base station 20.
　収集部２１１２は、それぞれの他の基地局２０から、セルＩＤ毎にＣＵ２２およびＤＵ２３のリソースの状態を示す情報を含むリソース情報を収集する。 The collection unit 2112 collects resource information including information indicating the state of the resources of the CU 22 and the DU 23 for each cell ID from each of the other base stations 20.
　ＤＣ可否判定部２１１３は、収集部２１１２によって収集されたリソース情報に基づいて、ＣＵ２２およびＤＵ２３の組み合わせ毎に、ＤＣが可能か否かを判定する。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、選択部２１１４へ出力する。 The DC availability determination unit 2113 determines whether DC is possible for each combination of the CU 22 and the DU 23 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
　選択部２１１４は、他の基地局２０にＤＣが依頼される前に、他の基地局２０のＣＵ２２およびＤＵ２３の組み合わせ毎に、ＤＣ可否判定部２１１３からＤＣ情報を取得する。そして、選択部２１１４は、ＤＣ可否判定部２１１３から出力されたＤＣ情報に基づいて、ＤＣが可能であることを示すＤＣ情報に対応するＣＵ２２およびＤＵ２３の組み合わせの中から、ＤＣを依頼するＣＵ２２およびＤＵ２３の組み合わせを選択する。選択部２１１４は、例えば、ＤＣが可能であることを示すＤＣ情報に対応するＣＵ２２およびＤＵ２３の組み合わせの中で、信号の品質が良いセル２００を管理するＤＵ２３を含む組み合わせを、優先的に選択する。そして、選択部２１１４は、選択された組み合わせに関する情報をＤＣ処理部２１１５へ出力する。 The selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each combination of the CU 22 and the DU 23 of the other base station 20 before the DC is requested to the other base station 20. Based on the DC information output from the DC availability determination unit 2113, the selection unit 2114 selects the CU 22 that requests DC from the combination of the CU 22 and DU 23 corresponding to the DC information indicating that DC is possible. A combination of DUs 23 is selected. For example, the selection unit 2114 preferentially selects a combination including the DU 23 that manages the cell 200 with good signal quality from among the combinations of the CU 22 and the DU 23 corresponding to DC information indicating that DC is possible. . Then, the selection unit 2114 outputs information on the selected combination to the DC processing unit 2115.
　ＤＣ処理部２１１５は、ＤＣを依頼する制御信号であるＤＣ要求を、通信部２１０およびコアネットワーク１１を介して、選択部２１１４によって選択された組み合わせに含まれるＣＵ２２へ送信する。ＤＣ要求には、ＤＣを依頼するＣＵ２２およびＤＵ２３の組み合わせに関する情報が含まれる。 The DC processing unit 2115 transmits a DC request, which is a control signal for requesting DC, to the CU 22 included in the combination selected by the selection unit 2114 via the communication unit 210 and the core network 11. The DC request includes information regarding the combination of the CU 22 and the DU 23 that requests DC.
　無線通信制御部２１１６は、無線制御プロトコルのうち、上位レイヤのプロトコルの処理を実行する。本実施例において、無線通信制御部２１１６は、例えば、ＬＬＳ（Low　Layer　Split）における上位レイヤ（ＲＲＣレイヤ、ＰＤＣＰレイヤ、ＲＬＣレイヤ、およびＭＡＣレイヤ）の処理を実行する。なお、無線通信制御部２１１６は、物理レイヤの処理の一部を実行してもよい。また、無線通信制御部２１１６は、例えば、ＨＬＳ（High　Layer　Split）における上位レイヤ（ＲＲＣレイヤおよびＰＤＣＰレイヤ）の処理を実行してもよい。 The wireless communication control unit 2116 executes processing of a higher layer protocol among the wireless control protocols. In the present embodiment, the radio communication control unit 2116 executes, for example, processing of an upper layer (RRC layer, PDCP layer, RLC layer, and MAC layer) in LLS (Low Layer Split). Note that the wireless communication control unit 2116 may execute part of the physical layer processing. Further, the wireless communication control unit 2116 may execute processing of higher layers (RRC layer and PDCP layer) in HLS (High Layer Split), for example.
　通信部２２３は、例えばＣＰＲＩ（Common　Public　Radio　Interface）等の通信規格に従って、ＣＵ２２とそれぞれのＤＵ２３との間で、光通信により信号の送信および受信を行う。 The communication unit 223 transmits and receives signals by optical communication between the CU 22 and each DU 23 according to a communication standard such as CPRI (Common Public Radio Interface).
　それぞれのＤＵ２３は、通信部２３０、無線部２３１、制御部２３２、メモリ２３３、およびアンテナ２３４を有する。通信部２３０は、例えばＣＰＲＩ等の通信規格に従って、ＤＵ２３とＣＵ２２との間で、光通信により信号の送信および受信を行う。 Each DU 23 includes a communication unit 230, a radio unit 231, a control unit 232, a memory 233, and an antenna 234. The communication unit 230 transmits and receives signals by optical communication between the DU 23 and the CU 22 according to a communication standard such as CPRI.
　メモリ２３３内には、例えば制御部２３２によって実行される各種プログラム等が格納される。制御部２３２は、例えばＣＰＵまたはＤＳＰ等のプロセッサを有し、メモリ２３３から読み出したプログラムを実行することにより制御部２３２が有する各機能を実現する。 In the memory 233, for example, various programs executed by the control unit 232 are stored. The control unit 232 includes a processor such as a CPU or a DSP, for example, and implements each function of the control unit 232 by executing a program read from the memory 233.
　無線部２３１は、アンテナ２３４を介して無線信号を送信することにより、無線信号が到達する範囲にセル２００を形成する。また、無線部２３１は、通信部２３０を介してＣＵ２２から出力された信号、および、アンテナ２３４を介して受信された信号に対して、無線制御プロトコルのうち、下位レイヤのプロトコルの処理を実行する。本実施例において、無線部２３１は、例えば、ＬＬＳにおける下位レイヤ（物理レイヤ）の処理を実行する。なお、無線部２３１は、物理レイヤの処理の一部を実行してもよい。また、無線部２３１は、例えば、ＨＬＳにおける下位レイヤ（ＲＬＣレイヤ、ＭＡＣレイヤ、および物理レイヤ）の処理を実行してもよい。無線部２３１は、送信部、受信部、および送受信部の一例である。 The radio unit 231 transmits the radio signal via the antenna 234, thereby forming the cell 200 in a range where the radio signal reaches. In addition, the radio unit 231 executes a lower layer protocol process of the radio control protocol on the signal output from the CU 22 via the communication unit 230 and the signal received via the antenna 234. . In the present embodiment, the wireless unit 231 executes, for example, processing of a lower layer (physical layer) in LLS. Note that the wireless unit 231 may execute part of the physical layer processing. Further, the radio unit 231 may execute processing of lower layers (RLC layer, MAC layer, and physical layer) in HLS, for example. The wireless unit 231 is an example of a transmission unit, a reception unit, and a transmission / reception unit.
　このように、ＤＵ２３の無線部２３１は、他の基地局２０にＤＣが依頼される前に、複数の他の基地局２０のそれぞれについて取得されたＤＣ情報に基づいて、ＤＣが可能であることを示すＤＣ情報に対応する他の基地局２０の中から、ＤＣを依頼する他の基地局２０が選択され、ＤＣにより行われる端末装置３０との間の通信トラフィックのうち、ＤＣが依頼された他の基地局の通信トラフィックを除いた残りの通信トラフィックに基づくデータを無線通信により端末装置３０との間で送信および受信する。 As described above, the radio unit 231 of the DU 23 can perform DC based on the DC information acquired for each of the plurality of other base stations 20 before DC is requested to the other base station 20. The other base station 20 requesting the DC is selected from the other base stations 20 corresponding to the DC information indicating the DC, and the DC is requested among the communication traffic with the terminal device 30 performed by the DC. Data based on the remaining communication traffic excluding communication traffic of other base stations is transmitted to and received from the terminal device 30 by wireless communication.
［基地局２０ｓ］
　図１６は、実施例４においてセカンダリ基地局として機能する基地局２０ｓの一例を示すブロック図である。なお、以下に説明する点を除き、図１６において、図４または図１４と同じ符号が付されたブロックは、図４または図１４におけるブロックと同一または同様の機能を有するため説明を省略する。本実施例４における基地局２０ｓの制御部２２１は、メモリ２２２から読み出したプログラムを実行することにより、ＤＣ処理部２１１５、無線通信制御部２１１６、およびリソース管理部２１１７の各機能を実現する。 [Base station 20s]
FIG. 16 is a block diagram illustrating an example of a base station 20s functioning as a secondary base station in the fourth embodiment. Except for the points described below, in FIG. 16, blocks denoted by the same reference numerals as those in FIG. 4 or FIG. 14 have the same or similar functions as the blocks in FIG. The control unit 221 of the base station 20 s according to the fourth embodiment implements the functions of the DC processing unit 2115, the wireless communication control unit 2116, and the resource management unit 2117 by executing the program read from the memory 222.
　リソース管理部２１１７は、コアネットワーク１１および通信部２１０を介して基地局２０ｍからリソース情報要求を受信した場合、通信部２２３を介して、基地局２０ｓ内のそれぞれのＤＵ２３にリソース情報要求を送信する。そして、リソース管理部２１１７は、通信部２２３を介してそれぞれのＤＵ２３からリソース情報を取得する。そして、リソース管理部２１１７は、基地局２０ｓ内のＣＵ２２およびそれぞれのＤＵ２３のリソースの状態を示すリソース情報を、通信部２１０およびコアネットワーク１１を介して基地局２０ｍへ送信する。 When the resource management unit 2117 receives a resource information request from the base station 20m via the core network 11 and the communication unit 210, the resource management unit 2117 transmits the resource information request to each DU 23 in the base station 20s via the communication unit 223. . Then, the resource management unit 2117 acquires resource information from each DU 23 via the communication unit 223. Then, the resource management unit 2117 transmits resource information indicating the resource status of the CU 22 and each DU 23 in the base station 20 s to the base station 20 m via the communication unit 210 and the core network 11.
　図１７は、実施例４においてリソース情報５０に含まれるデータの一例を示す図である。それぞれの基地局２０ｓから基地局２０ｍへ送信されるリソース情報５０には、例えば図１７に示されるように、セルＩＤに対応付けて、ＣＵ＿ＩＤ、ＣＵリソース情報、ＤＵ＿ＩＤ、およびＤＵリソース情報が格納される。ＣＵリソース情報は、ＣＵ＿ＩＤに対応するＣＵ２２のリソース情報である。ＤＵリソース情報は、ＤＵ＿ＩＤに対応するＤＵ２３のリソース情報である。なお、１つのセル２００が複数のＤＵ２３によって形成される場合、１つのセルＩＤに対して、ＤＵ＿ＩＤおよびＤＵリソース情報のペアが複数対応付けられる。 FIG. 17 is a diagram illustrating an example of data included in the resource information 50 in the fourth embodiment. In the resource information 50 transmitted from each base station 20s to the base station 20m, for example, as shown in FIG. 17, CU_ID, CU resource information, DU_ID, and DU resource information are stored in association with the cell ID. The The CU resource information is resource information of the CU 22 corresponding to the CU_ID. The DU resource information is resource information of the DU 23 corresponding to the DU_ID. When one cell 200 is formed by a plurality of DUs 23, a plurality of pairs of DU_ID and DU resource information are associated with one cell ID.
　それぞれのＤＵ２３は、以下に説明する点を除き、図１４において説明されたＤＵ２３と同様であるため、詳細な説明を省略する。制御部２３２は、通信部２３０を介して、ＣＵ２２からリソース情報要求を受信した場合、ＤＵ２３内のリソースの状態を示すリソース情報を、通信部２３０を介してＣＵ２２へ送信する。また、制御部２３２は、ＣＵ２２からＤＣ要求を受信した場合、ＤＣが可能であればＡＣＫをＣＵ２２へ返し、ＤＣが困難であればＮＡＣＫ（Negative　ACKnowledgement）をＣＵ２２へ返す。 Each DU 23 is the same as the DU 23 described in FIG. 14 except for the points described below, and thus detailed description thereof is omitted. When the control unit 232 receives a resource information request from the CU 22 via the communication unit 230, the control unit 232 transmits resource information indicating the state of the resource in the DU 23 to the CU 22 via the communication unit 230. Further, when receiving a DC request from the CU 22, the control unit 232 returns an ACK to the CU 22 if the DC is possible, and returns a NACK (Negative ACKnowledgement) to the CU 22 if the DC is difficult.
［無線通信システム１０の処理］
　図１８は、実施例４における無線通信システム１０の処理の一例を示す図である。図１８の例では、１つの端末装置３０と、マスタ基地局として機能する１つの基地局２０ｍと、セカンダリ基地局の候補として機能する１つの基地局２０ｓを含む無線通信システム１０が想定されている。しかし、無線通信システム１０は、複数の基地局２０ｓを有していてもよい。また、図１８の例では、基地局２０ｍ内のＤＵ２３－１によって形成されたセル２００内に端末装置３０が位置している。 [Processing of Radio Communication System 10]
FIG. 18 is a diagram illustrating an example of processing of the wireless communication system 10 according to the fourth embodiment. In the example of FIG. 18, a radio communication system 10 including one terminal device 30, one base station 20m that functions as a master base station, and one base station 20s that functions as a candidate for a secondary base station is assumed. . However, the radio communication system 10 may include a plurality of base stations 20s. In the example of FIG. 18, the terminal device 30 is located in the cell 200 formed by the DU 23-1 in the base station 20m.
　まず、マスタ基地局として機能する基地局２０ｍのＣＵ２２－１は、基地局２０ｍ内のＣＵ２２－１およびそれぞれのＤＵ２３のリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。そして、ＣＵ２２－１は、ＤＣにより端末装置３０との通信を実行することを決定する（Ｓ２００）。そして、ＣＵ２２－１は、ＭＲ要求を、ＤＣにより端末装置３０と通信を行うＤＵ２３（図１８の例ではＤＵ２３－１）へ送信する（Ｓ２０１）。ＤＵ２３－１は、ＣＵ２２－１から送信されたＭＲ要求を、無線信号により端末装置３０へ送信する（Ｓ２０２）。 First, whether the CU 22-1 of the base station 20m functioning as the master base station performs communication with the terminal device 30 by DC based on the resource state of the CU 22-1 and each DU 23 in the base station 20m. Determine whether or not. Then, the CU 22-1 determines to perform communication with the terminal device 30 by DC (S200). Then, the CU 22-1 transmits the MR request to the DU 23 (DU 23-1 in the example of FIG. 18) that communicates with the terminal device 30 by DC (S201). The DU 23-1 transmits the MR request transmitted from the CU 22-1 to the terminal device 30 by a radio signal (S202).
　端末装置３０は、ＭＲ要求を受信した場合、周囲のセル２００において基地局２０から送信された信号の品質を測定する。そして、端末装置３０は、周囲のセル２００毎の信号の品質を示す品質情報を含むＭＲを作成し、作成したＭＲをＤＵ２３－１へ送信する（Ｓ２０３）。 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. Then, the terminal device 30 creates an MR including quality information indicating the quality of the signal for each surrounding cell 200, and transmits the created MR to the DU 23-1 (S203).
　ＤＵ２３－１は、端末装置３０からＭＲを受信した場合、受信したＭＲをＣＵ２２－１へ転送する（Ｓ２０４）。ＣＵ２２－１は、ＤＵ２３－１から転送されたＭＲに含まれるセル２００毎の品質情報に基づいて、リソース情報要求の送信先の基地局２０ｓを１つ以上特定する（Ｓ２０５）。そして、ＣＵ２２－１は、特定された基地局２０ｓのＣＵ２２－２にコアネットワーク１１を介してリソース情報要求を送信する（Ｓ２０６）。リソース情報要求の送信先の基地局２０ｓが複数特定された場合には、リソース情報要求は、例えばマルチキャストで、それぞれの基地局２０ｓのＣＵ２２－２へ送信される。 When receiving the MR from the terminal device 30, the DU 23-1 transfers the received MR to the CU 22-1 (S204). Based on the quality information for each cell 200 included in the MR transferred from the DU 23-1, the CU 22-1 specifies one or more base stations 20s that are the transmission destinations of the resource information request (S205). Then, the CU 22-1 transmits a resource information request to the CU 22-2 of the specified base station 20s via the core network 11 (S206). When a plurality of base stations 20s as transmission destinations of resource information requests are specified, the resource information requests are transmitted to the CU 22-2 of each base station 20s by, for example, multicast.
　それぞれの基地局２０ｓのＣＵ２２－２は、コアネットワーク１１を介して基地局２０ｍからリソース情報要求を受信した場合、基地局２０ｓ内のそれぞれのＤＵ２３にリソース情報要求を送信する（Ｓ２０７－１～Ｓ２０７－３）。それぞれのＤＵ２３は、ＣＵ２２－２からリソース情報要求を受信した場合、ＤＵ２３内のリソースの状態を示すリソース情報を、ＣＵ２２－２へ送信する（Ｓ２０８－１～Ｓ２０８－３）。ＣＵ２２－２は、基地局２０ｓ内のＣＵ２２－２およびそれぞれのＤＵ２３のリソースの状態を示すリソース情報を、コアネットワーク１１を介して基地局２０ｍへ送信する（Ｓ２０９）。 When receiving the resource information request from the base station 20m via the core network 11, the CU 22-2 of each base station 20s transmits the resource information request to each DU 23 in the base station 20s (S207-1 to S207). -3). When receiving each resource information request from the CU 22-2, each DU 23 transmits resource information indicating the state of the resource in the DU 23 to the CU 22-2 (S208-1 to S208-3). The CU 22-2 transmits resource information indicating the state of the resources of the CU 22-2 and each DU 23 in the base station 20s to the base station 20m via the core network 11 (S209).
　次に、基地局２０ｍのＣＵ２２－１は、基地局２０ｓから受信したリソース情報に基づいて、ＣＵ２２およびＤＵ２３の組み合わせのそれぞれについて、ＤＣが可能か否かを判定する（Ｓ２１０）。そして、ＣＵ２２－１は、ＤＣが可能であるＣＵ２２およびＤＵ２３の組み合わせの中から、ＤＣを依頼するＣＵ２２およびＤＵ２３の組み合わせを選択する（Ｓ２１１）。ＣＵ２２－１は、例えば、ＤＣが可能である基地局２０ｓのＣＵ２２およびＤＵ２３の組み合わせの中で、端末装置３０によって受信される信号の品質が最も良いセル２００を管理するＤＵ２３を含む組み合わせを選択する。図１８の例では、ＤＵ２３－４が、端末装置３０によって受信される信号の品質が最も良いセル２００を管理するＤＵ２３である。 Next, the CU 22-1 of the base station 20m determines whether or not DC is possible for each combination of the CU 22 and the DU 23 based on the resource information received from the base station 20s (S210). Then, the CU 22-1 selects the combination of the CU 22 and the DU 23 that requests DC from the combination of the CU 22 and the DU 23 that can be DC (S211). The CU 22-1 selects, for example, a combination including the DU 23 that manages the cell 200 having the best quality of the signal received by the terminal device 30 among the combinations of the CU 22 and the DU 23 of the base station 20s capable of DC. . In the example of FIG. 18, the DU 23-4 is the DU 23 that manages the cell 200 with the best quality of the signal received by the terminal device 30.
　そして、ＣＵ２２－１は、ＤＣを依頼する制御信号であるＤＣ要求を、コアネットワーク１１を介して、ステップＳ２１１において選択された組合せに含まれるＣＵ２２（図１８の例ではＣＵ２２－２）へ送信する（Ｓ２１２）。ＤＣ要求を受信したＣＵ２２－２は、ＤＣ要求をＤＵ２３－４へ転送する（Ｓ２１３）。ＤＵ２３－４は、ＤＣ要求を受け入れることを示すＡＣＫを、ＣＵ２２－２へ送信する（Ｓ２１４）。ＣＵ２２－２は、ＤＣ要求を受け入れることを示すＡＣＫを、コアネットワーク１１を介してＣＵ２２－１へ送信する（Ｓ２１５）。そして、基地局２０ｍと基地局２０ｓ－１とは、連携してＤＣにより端末装置３０との無線通信を実行する。 Then, the CU 22-1 transmits a DC request, which is a control signal for requesting DC, to the CU 22 (CU 22-2 in the example of FIG. 18) included in the combination selected in step S211 via the core network 11. (S212). The CU 22-2 that has received the DC request transfers the DC request to the DU 23-4 (S213). The DU 23-4 transmits an ACK indicating acceptance of the DC request to the CU 22-2 (S214). The CU 22-2 transmits ACK indicating acceptance of the DC request to the CU 22-1 via the core network 11 (S215). Then, the base station 20m and the base station 20s-1 cooperate to execute wireless communication with the terminal device 30 by DC.
［実施例４の効果］
　以上、実施例４について説明した。上記したように、本実施例の基地局２０は、ＣＵ２２および複数のＤＵ２３を有する。他の基地局２０のＣＵ２２にＤＣを依頼するＣＵ２２は、他の基地局２０にＤＣを依頼する前に、それぞれの他の基地局２０内のＣＵ２２およびＤＵ２３の組み合わせ毎に、ＤＣが可能であるか否かを示すＤＣ情報を収集する。そして、他の基地局２０のＣＵ２２にＤＣを依頼するＣＵ２２は、収集されたＤＣ情報に基づいて、ＤＣを依頼するＣＵ２２およびＤＵ２３の組み合わせを特定し、特定された組み合わせに含まれるＣＵ２２へＤＣを依頼する。これにより、本実施例の基地局２０は、ＤＣ要求が受け入れられる可能性を高めることができ、ＤＣをより迅速に確立することができる。 [Effect of Example 4]
In the above, Example 4 was demonstrated. As described above, the base station 20 of this embodiment includes the CU 22 and a plurality of DUs 23. The CU 22 that requests DC to the CU 22 of another base station 20 can perform DC for each combination of the CU 22 and DU 23 in each other base station 20 before requesting DC to the other base station 20. DC information indicating whether or not is collected. Then, the CU 22 that requests DC to the CU 22 of another base station 20 specifies the combination of the CU 22 and DU 23 that requests DC based on the collected DC information, and sends the DC to the CU 22 included in the specified combination. Ask. Thereby, the base station 20 of a present Example can raise possibility that a DC request | requirement will be accepted, and can establish DC more rapidly.
　上記した実施例４では、ＣＵが制御プレーンのデータおよびユーザープレーンのデータの両方を処理する。これに対し、本実施例５では、ＣＵ－ＣＰ（Central　Unit-C-Plane）が主に制御プレーンのデータを処理し、ＣＵ－ＵＰ（Central　Unit-U-Plane）が主にユーザープレーンのデータを処理する点が実施例４とは異なる。 In the fourth embodiment, the CU processes both control plane data and user plane data. In contrast, in the fifth embodiment, CU-CP (Central Unit-C-Plane) mainly processes control plane data, and CU-UP (Central Unit-U-Plane) mainly processes user plane data. Is different from the fourth embodiment.
［無線通信システム１０］
　図１９は、実施例５における無線通信システム１０の一例を示す図である。無線通信システム１０は、複数の基地局２０と、端末装置３０とを備える。それぞれの基地局２０は、コアネットワーク１１に接続されており、端末装置３０の無線接続を制御し、端末装置３０とコアネットワーク１１との間の通信を中継する。 [Wireless communication system 10]
FIG. 19 is a diagram illustrating an example of the wireless communication system 10 according to the fifth embodiment. The wireless communication system 10 includes a plurality of base stations 20 and a terminal device 30. Each base station 20 is connected to the core network 11, controls the wireless connection of the terminal device 30, and relays communication between the terminal device 30 and the core network 11.
　基地局２０－１は、ＣＵ－ＣＰ２４、複数のＣＵ－ＵＰ２５－１～２５－２、および複数のＤＵ２３－１～６を有する。本実施例において、ＣＵ－ＵＰ２５－１は、ＤＵ２３－１～２３－３が接続され、ＣＵ－ＵＰ２５－２には、ＤＵ２３－４～２３－６が接続されている。また、本実施例において、複数のＤＵ２３－１～２３－３は、セル２００－１を形成し、複数のＤＵ２３－４～２３－５は、セル２００－２を形成し、ＤＵ２３－６は、セル２００－３を形成する。なお、以下では、複数のＣＵ－ＵＰ２５－１～２５－２のそれぞれを区別することなく総称する場合にＣＵ－ＵＰ２５と記載し、複数のＤＵ２３－１～２３－６のそれぞれを区別することなく総称する場合にＤＵ２３と記載する。ＣＵ－ＣＰ２４は、通信制御装置の一例であり、それぞれのＤＵ２３は、無線装置の一例である。 The base station 20-1 has a CU-CP 24, a plurality of CU-UPs 25-1 to 25-2, and a plurality of DUs 23-1 to 6. In this embodiment, the CU-UP 25-1 is connected to DUs 23-1 to 23-3, and the CU-UP 25-2 is connected to DUs 23-4 to 23-6. In this embodiment, the plurality of DUs 23-1 to 23-3 form the cell 200-1, the plurality of DUs 23-4 to 23-5 form the cell 200-2, and the DU 23-6 A cell 200-3 is formed. In the following, a plurality of CU-UPs 25-1 to 25-2 are collectively referred to as CU-UP25 without being distinguished, and a plurality of DUs 23-1 to 23-6 are not distinguished from each other. When referring generically, it is described as DU23. The CU-CP 24 is an example of a communication control device, and each DU 23 is an example of a wireless device.
　また、図１８の例では、それぞれの基地局２０内には、１つのＣＵ－ＣＰ２４と、２つのＣＵ－ＵＰ２５と、６つのＤＵ２３が設けられるが、ＣＵ－ＣＰ２４、ＣＵ－ＵＰ２５、およびＤＵ２３の数はこれに限られない。ＣＵ－ＣＰ２４およびそれぞれのＣＵ－ＵＰ２５は、例えばＢＢＵ等の制御装置により実現され、それぞれのＤＵ２３は、例えばＲＲＨ等の無線装置により実現される。なお、ＣＵ－ＣＰ２４またはそれぞれのＣＵ－ＵＰ２５は、例えばＲＲＨ等の無線装置に含まれていてもよい。また、ＣＵ－ＣＰ２４およびそれぞれのＣＵ－ＵＰ２５は、別個の制御装置に実現されてもよい。 In the example of FIG. 18, one CU-CP 24, two CU-UPs 25, and six DUs 23 are provided in each base station 20, but the CU-CP 24, CU-UP 25, and DU 23 The number is not limited to this. The CU-CP 24 and each CU-UP 25 are realized by a control device such as BBU, for example, and each DU 23 is realized by a radio device such as RRH, for example. Note that the CU-CP 24 or each CU-UP 25 may be included in a radio apparatus such as an RRH. Further, the CU-CP 24 and each CU-UP 25 may be realized in separate control devices.
［ＣＵ－ＣＰ２４］
　図２０は、実施例５におけるＣＵ－ＣＰ２４の一例を示すブロック図である。ＣＵ－ＣＰ２４は、例えば図２０に示されるように、通信部２４０、制御部２４１、メモリ２４２、および通信部２４３を有する。なお、以下に説明する点を除き、図２０において、図２または図１１と同じ符号が付されたブロックは、図２または図１１におけるブロックと同一または同様の機能を有するため説明を省略する。 [CU-CP24]
FIG. 20 is a block diagram illustrating an example of the CU-CP 24 according to the fifth embodiment. The CU-CP 24 includes a communication unit 240, a control unit 241, a memory 242, and a communication unit 243, for example, as shown in FIG. Except for the points described below, in FIG. 20, blocks denoted by the same reference numerals as those in FIG. 2 or FIG. 11 have the same or similar functions as the blocks in FIG.
　メモリ２４２内には、例えば図２１に示されるような基地局情報２１２０が格納される。図２１は、実施例５における基地局情報２１２０の一例を示す図である。本実施例における基地局情報２１２０には、セルＩＤに対応付けて、ＣＵ－ＣＰ＿ＩＤ、アクセス情報、およびＤＵ＿ＩＤが格納される。ＣＵ－ＣＰ＿ＩＤは、セルＩＤに対応するセル２００を管理するＤＵ２３を介してユーザデータを送受信するＣＵ－ＵＰ２５を管理するＣＵ－ＣＰ２４を識別する情報である。アクセス情報は、対応するＣＵ－ＣＰ＿ＩＤで識別されるＣＵ－ＣＰ２４にアクセスするための情報であり、例えばアドレス情報等である。なお、１つのセル２００が複数のＤＵ２３によって形成される場合、１つのセルＩＤに対して、ＤＵ＿ＩＤが複数対応付けられる。基地局情報２１２０は、基地局２０の管理者等により、予めメモリ２４２内に格納される。また、メモリ２４２内には、制御部２４１によって実行される各種プログラム等が格納される。 In the memory 242, base station information 2120 as shown in FIG. 21, for example, is stored. FIG. 21 is a diagram illustrating an example of the base station information 2120 according to the fifth embodiment. In the base station information 2120 in this embodiment, CU-CP_ID, access information, and DU_ID are stored in association with the cell ID. The CU-CP_ID is information for identifying the CU-CP 24 that manages the CU-UP 25 that transmits and receives user data via the DU 23 that manages the cell 200 corresponding to the cell ID. The access information is information for accessing the CU-CP 24 identified by the corresponding CU-CP_ID, such as address information. When one cell 200 is formed by a plurality of DUs 23, a plurality of DU_IDs are associated with one cell ID. The base station information 2120 is stored in the memory 242 in advance by an administrator of the base station 20 or the like. In the memory 242, various programs executed by the control unit 241 are stored.
　制御部２４１は、メモリ２４２から読み出したプログラムを実行することにより、ＤＣ実行判定部２１１０、収集部２１１２、ＤＣ可否判定部２１１３、選択部２１１４、ＤＣ処理部２１１５、および無線通信制御部２１１６の各機能を実現する。 The control unit 241 executes each program of the DC execution determination unit 2110, the collection unit 2112, the DC availability determination unit 2113, the selection unit 2114, the DC processing unit 2115, and the wireless communication control unit 2116 by executing the program read from the memory 242. Realize the function.
　収集部２１１２は、それぞれのＣＵ－ＵＰ２５から、セルＩＤ毎にＣＵ－ＵＰ２５およびＤＵ２３のリソースの状態を示す情報を含むリソース情報を収集する。そして、収集部２１１２は、収集されたリソース情報をメモリ２４２内のリソース情報２１２１に格納する。 The collection unit 2112 collects resource information including information indicating the state of the resources of the CU-UP 25 and the DU 23 for each cell ID from each CU-UP 25. Then, the collection unit 2112 stores the collected resource information in the resource information 2121 in the memory 242.
　図２２は、実施例５においてリソース情報５１に含まれるデータの一例を示す図である。メモリ２１２は、例えば図２２に示すようなリソース情報５１をそれぞれのＣＵ－ＵＰ２５から収集する。リソース情報５１には、セルＩＤに対応付けて、ＣＵ－ＵＰ＿ＩＤ、ＣＵ－ＵＰリソース情報、ＤＵ＿ＩＤ、およびＤＵリソース情報が格納される。ＣＵ－ＵＰ＿ＩＤは、セルＩＤに対応するセル２００を管理するＤＵ２３を介してユーザデータを送受信するＣＵ－ＵＰ２５を識別する情報である。ＣＵ－ＵＰリソース情報は、ＣＵ－ＵＰ＿ＩＤに対応するＣＵ－ＵＰ２５のリソース情報である。ＤＵリソース情報は、ＤＵ＿ＩＤに対応するＤＵ２３のリソース情報である。なお、１つのセル２００が複数のＤＵ２３によって形成される場合、１つのセルＩＤに対して、ＤＵ＿ＩＤおよびＤＵリソース情報のペアが複数対応付けられる。 FIG. 22 is a diagram illustrating an example of data included in the resource information 51 in the fifth embodiment. The memory 212 collects resource information 51 as shown in FIG. 22 from each CU-UP 25, for example. The resource information 51 stores CU-UP_ID, CU-UP resource information, DU_ID, and DU resource information in association with the cell ID. The CU-UP_ID is information for identifying the CU-UP 25 that transmits and receives user data via the DU 23 that manages the cell 200 corresponding to the cell ID. The CU-UP resource information is resource information of the CU-UP 25 corresponding to the CU-UP_ID. The DU resource information is resource information of the DU 23 corresponding to the DU_ID. When one cell 200 is formed by a plurality of DUs 23, a plurality of pairs of DU_ID and DU resource information are associated with one cell ID.
　ＤＣ実行判定部２１１０は、メモリ２４２内のリソース情報２１２１を参照し、それぞれＣＵ－ＵＰ２５およびそれぞれのＤＵ２３のリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。 The DC execution determination unit 2110 refers to the resource information 2121 in the memory 242, and determines whether or not to perform communication with the terminal device 30 by DC based on the resource statuses of the CU-UP 25 and the DU 23, respectively. judge.
　ＤＣ可否判定部２１１３は、収集部２１１２によって収集されたリソース情報に基づいて、ＣＵ－ＵＰ２５およびＤＵ２３の組み合わせ毎に、ＤＣが可能か否かを判定する。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、選択部２１１４へ出力する。 The DC availability determination unit 2113 determines whether DC is possible for each combination of the CU-UP 25 and the DU 23 based on the resource information collected by the collection unit 2112. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
　選択部２１１４は、ＤＵ２３にＤＣが依頼される前に、ＣＵ－ＵＰ２５およびＤＵ２３の組み合わせ毎に、ＤＣ可否判定部２１１３からＤＣ情報を取得する。そして、選択部２１１４は、ＤＣ可否判定部２１１３から出力されたＤＣ情報に基づき、ＤＣが可能であることを示すＤＣ情報に対応するＣＵ－ＵＰ２５およびＤＵ２３の組み合わせの中から、ＤＣを依頼するＣＵ－ＵＰ２５およびＤＵ２３の組み合わせを選択する。選択部２１１４は、例えば、ＤＣが可能であることを示すＤＣ情報に対応するＣＵ－ＵＰ２５およびＤＵ２３の組み合わせの中で、信号の品質が良いセル２００を管理するＤＵ２３を含む組み合わせを、優先的に選択する。そして、選択部２１１４は、選択されたＣＵ－ＵＰ２５およびＤＵ２３の組み合わせに関する情報をＤＣ処理部２１１５へ出力する。 The selection unit 2114 acquires DC information from the DC availability determination unit 2113 for each combination of the CU-UP 25 and the DU 23 before DC is requested to the DU 23. Based on the DC information output from the DC availability determination unit 2113, the selection unit 2114 selects the CU that requests DC from the combination of the CU-UP 25 and the DU 23 corresponding to the DC information indicating that DC is possible. -Select the combination of UP25 and DU23. For example, among the combinations of CU-UP 25 and DU 23 corresponding to DC information indicating that DC is possible, the selection unit 2114 preferentially selects a combination including the DU 23 that manages the cell 200 with good signal quality. select. Then, the selection unit 2114 outputs information related to the selected combination of the CU-UP 25 and the DU 23 to the DC processing unit 2115.
　ＤＣ処理部２１１５は、ＤＣを依頼する制御信号を、選択部２１１４によって選択された組み合わせに含まれるＣＵ－ＵＰ２５へ送信する。ＤＣを依頼する制御信号には、ＤＣを依頼するＣＵ－ＵＰ２５およびＤＵ２３の組み合わせに関する情報が含まれる。 The DC processing unit 2115 transmits a control signal for requesting DC to the CU-UP 25 included in the combination selected by the selection unit 2114. The control signal for requesting DC includes information on the combination of CU-UP 25 and DU 23 for requesting DC.
　無線通信制御部２１１６は、無線制御プロトコルのうち、制御プレーンにおける上位レイヤのプロトコルの処理を実行する。本実施例において、無線通信制御部２１１６は、例えば、ＬＬＳにおける制御プレーンの上位レイヤ（ＲＲＣレイヤ、ＰＤＣＰ－Ｃレイヤ、ＲＬＣ－Ｃレイヤ、およびＭＡＣ－Ｃレイヤ）の処理を実行する。なお、無線通信制御部２１１６は、物理レイヤの処理の一部を実行してもよい。また、無線通信制御部２１１６は、例えば、ＨＬＳにおける上位レイヤ（ＲＲＣ－ＣレイヤおよびＰＤＣＰ－Ｃレイヤ）の処理を実行してもよい。 The radio communication control unit 2116 executes processing of the upper layer protocol in the control plane among the radio control protocols. In the present embodiment, the radio communication control unit 2116 executes, for example, processing of an upper layer (RRC layer, PDCP-C layer, RLC-C layer, and MAC-C layer) of a control plane in LLS. Note that the wireless communication control unit 2116 may execute part of the physical layer processing. Further, the radio communication control unit 2116 may execute processing of higher layers (RRC-C layer and PDCP-C layer) in HLS, for example.
　通信部２４３は、例えばＣＰＲＩ等の通信規格に従って、それぞれのＣＵ－ＵＰ２５との間で、光通信により信号の送信および受信を行う。 The communication unit 243 performs transmission and reception of signals by optical communication with each CU-UP 25 according to a communication standard such as CPRI.
［ＣＵ－ＵＰ２５］
　図２３は、実施例５におけるＣＵ－ＵＰ２５の一例を示すブロック図である。ＣＵ－ＵＰ２５は、例えば図２３に示されるように、通信部２５０、制御部２５１、メモリ２５２、および通信部２５３を有する。なお、以下に説明する点を除き、図２３において、図４と同じ符号が付されたブロックは、図４におけるブロックと同一または同様の機能を有するため説明を省略する。通信部２５０は、送信部、受信部、および送受信部の一例である。 [CU-UP25]
FIG. 23 is a block diagram illustrating an example of the CU-UP 25 according to the fifth embodiment. The CU-UP 25 includes a communication unit 250, a control unit 251, a memory 252, and a communication unit 253, for example, as shown in FIG. Except for the points described below, in FIG. 23, blocks denoted by the same reference numerals as those in FIG. 4 have the same or similar functions as the blocks in FIG. The communication unit 250 is an example of a transmission unit, a reception unit, and a transmission / reception unit.
　メモリ２５２内には、制御部２５１によって実行される各種プログラム等が格納される。制御部２５１は、メモリ２５２から読み出したプログラムを実行することにより、ＤＣ処理部２１１５、リソース管理部２１１７、および無線通信制御部２１１８の各機能を実現する。 In the memory 252, various programs executed by the control unit 251 are stored. The control unit 251 implements the functions of the DC processing unit 2115, the resource management unit 2117, and the wireless communication control unit 2118 by executing the program read from the memory 252.
　リソース管理部２１１７は、配下のそれぞれのＤＵ２３のリソースの状態を管理している。また、リソース管理部２１１７は、所定のタイミング毎に、通信部２５０を介して、リソース情報をＣＵ－ＣＰ２４へ送信する。所定のタイミングとは、例えば、ＣＵ－ＵＰ２５またはそれぞれのＤＵ２３において、リソースの状態が所定量以上変化したタイミングでる。これにより、ＣＵ－ＣＰ２４とそれぞれのＣＵ－ＵＰ２５との間において、リソース情報の収集における通信トラフィックを削減することができる。なお、所定のタイミングとは、定期的なタイミングであってもよい。 The resource management unit 2117 manages the resource status of each subordinate DU 23. Further, the resource management unit 2117 transmits the resource information to the CU-CP 24 via the communication unit 250 at every predetermined timing. The predetermined timing is, for example, a timing at which the resource state has changed by a predetermined amount or more in the CU-UP 25 or each DU 23. As a result, communication traffic for collecting resource information can be reduced between the CU-CP 24 and each CU-UP 25. The predetermined timing may be a periodic timing.
　無線通信制御部２１１８は、無線制御プロトコルのうち、ユーザープレーンにおける上位レイヤのプロトコルの処理を実行する。本実施例において、無線通信制御部２１１８は、例えば、ＬＬＳにおけるユーザープレーンの上位レイヤ（ＰＤＣＰ－Ｕレイヤ、ＲＬＣ－Ｕレイヤ、およびＭＡＣ－Ｕレイヤ）の処理を実行する。なお、無線通信制御部２１１６は、物理レイヤの処理の一部を実行してもよい。また、無線通信制御部２１１６は、例えば、ＨＬＳにおける上位レイヤ（ＰＤＣＰ－Ｕレイヤ）の処理を実行してもよい。 The wireless communication control unit 2118 executes processing of the upper layer protocol in the user plane among the wireless control protocols. In the present embodiment, the radio communication control unit 2118 executes, for example, processing of upper layers (PDCP-U layer, RLC-U layer, and MAC-U layer) of the user plane in LLS. Note that the wireless communication control unit 2116 may execute part of the physical layer processing. Further, the radio communication control unit 2116 may execute processing of an upper layer (PDCP-U layer) in HLS, for example.
　通信部２５３は、例えばＣＰＲＩ等の通信規格に従って、ＣＵ－ＵＰ２５とそれぞれのＤＵ２３との間で、光通信により信号の送信および受信を行う。 The communication unit 253 transmits and receives signals by optical communication between the CU-UP 25 and each DU 23 in accordance with a communication standard such as CPRI.
　それぞれのＤＵ２３は、以下に説明する点を除き、図１４において説明されたＤＵ２３と同様であるため、詳細な説明を省略する。それぞれのＤＵ２３の制御部２３２は、通信部２３０を介して、ＣＵ－ＵＰ２５からリソース情報要求を受信した場合、ＤＵ２３内のリソースの状態を示すリソース情報を、通信部２３０を介してＣＵ－ＵＰ２５へ送信する。また、制御部２３２は、ＣＵ－ＵＰ２５からＤＣ要求を受信した場合、ＤＣが可能であればＡＣＫをＣＵ－ＵＰ２５へ返し、ＤＣが困難であればＮＡＣＫをＣＵ－ＵＰ２５へ返す。 Each DU 23 is the same as the DU 23 described in FIG. 14 except for the points described below, and thus detailed description thereof is omitted. When the control unit 232 of each DU 23 receives a resource information request from the CU-UP 25 via the communication unit 230, resource information indicating the state of the resource in the DU 23 is transmitted to the CU-UP 25 via the communication unit 230. Send. Also, when receiving a DC request from the CU-UP 25, the control unit 232 returns ACK to the CU-UP 25 if DC is possible, and returns NACK to the CU-UP 25 if DC is difficult.
［無線通信システム１０の処理］
　図２４は、実施例５における無線通信システム１０の処理の一例を示す図である。 [Processing of Radio Communication System 10]
FIG. 24 is a diagram illustrating an example of processing of the wireless communication system 10 according to the fifth embodiment.
　まず、それぞれのＤＵ２３は、リソースの状態が所定量以上変化したことを検出した場合、リソース情報をＣＵ－ＵＰ２５へ送信する（Ｓ３００、Ｓ３０１）。それぞれのＣＵ－ＵＰ２５は、ＤＵ２３から受信したリソース情報に、ＣＵ－ＵＰ２５のリソースの状態を示す情報を含めてＣＵ－ＣＰ２４へ送信する（Ｓ３０２、Ｓ３０３）。ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から送信されたリソース情報を保存する。ステップＳ３００～Ｓ３０３において送信されるリソース情報は、ＤＣにより端末装置３０との通信を実行するか否かの判定、および、ＣＵ－ＵＰ２５およびＤＵ２３の組み合わせ毎にＤＣの実行が可能か否かの判定の両方に用いられる。 First, when each DU 23 detects that the state of the resource has changed by a predetermined amount or more, each DU 23 transmits resource information to the CU-UP 25 (S300, S301). Each CU-UP 25 transmits the resource information received from the DU 23 to the CU-CP 24 including information indicating the resource state of the CU-UP 25 (S302, S303). The CU-CP 24 stores the resource information transmitted from each CU-UP 25. The resource information transmitted in steps S300 to S303 is determined based on whether or not communication with the terminal device 30 is executed by DC and whether or not DC can be executed for each combination of the CU-UP 25 and the DU 23. Used for both.
　ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から送信されたリソース情報に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。そして、ＣＵ－ＣＰ２４は、ＤＣにより端末装置３０との通信を実行する決定した場合（Ｓ３０４）、ＭＲ要求を、ＤＣにより端末装置３０と通信を行うＤＵ２３－１と通信を行うＣＵ－ＵＰ２５－１へ送信する（Ｓ３０５）。ＣＵ－ＵＰ２５－１は、ＣＵ－ＣＰ２４から送信されたＭＲ要求を、ＤＵ２３－１へ転送する（Ｓ３０６）。ＤＵ２３－１は、ＣＵ－ＵＰ２５－１から送信されたＭＲ要求を、無線信号により端末装置３０へ送信する（Ｓ３０７）。 The CU-CP 24 determines whether or not to communicate with the terminal device 30 by DC based on the resource information transmitted from each CU-UP 25. When the CU-CP 24 decides to execute communication with the terminal device 30 by DC (S304), the CU-CP 24-1 communicates with the DU 23-1 that communicates with the terminal device 30 by DC. (S305). The CU-UP 25-1 transfers the MR request transmitted from the CU-CP 24 to the DU 23-1 (S306). The DU 23-1 transmits the MR request transmitted from the CU-UP 25-1 to the terminal device 30 using a radio signal (S307).
　端末装置３０は、ＭＲ要求を受信した場合、周囲のセル２００において基地局２０から送信された信号の品質を測定する。そして、端末装置３０は、周囲のセル２００毎の信号の品質を示す品質情報を含むＭＲを作成し、作成したＭＲをＤＵ２３－１へ送信する（Ｓ３０８）。ＤＵ２３－１は、端末装置３０から受信したＭＲをＣＵ－ＵＰ２５－１へ転送する（Ｓ３０９）。ＣＵ－ＵＰ２５－１は、ＤＵ２３－１から受信したＭＲをＣＵ－ＣＰ２４へ転送する（Ｓ３１０）。 When the terminal device 30 receives the MR request, the terminal device 30 measures the quality of the signal transmitted from the base station 20 in the surrounding cell 200. Then, the terminal device 30 creates an MR including quality information indicating the quality of the signal for each surrounding cell 200, and transmits the created MR to the DU 23-1 (S308). The DU 23-1 transfers the MR received from the terminal device 30 to the CU-UP 25-1 (S309). The CU-UP 25-1 transfers the MR received from the DU 23-1 to the CU-CP 24 (S310).
　ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から収集された最新のリソース情報に基づいて、ＣＵ－ＵＰ２５およびＤＵ２３の組み合わせのそれぞれについて、ＤＣが可能か否かを判定する（Ｓ３１１）。そして、ＣＵ－ＣＰ２４は、ＤＣが可能であるＣＵ－ＵＰ２５およびＤＵ２３の組み合わせの中から、ＤＣ要求の送信先となるＣＵ－ＵＰ２５およびＤＵ２３の組み合わせを選択する（Ｓ３１２）。ＣＵ－ＣＰ２４は、例えば、ＤＣが可能であるＣＵ－ＵＰ２５およびＤＵ２３の組み合わせの中で、端末装置３０によって受信される信号の品質が最も良いセル２００を管理するＤＵ２３を含む組み合わせを優先的に選択する。図２４の例では、ＤＵ２３－４が、端末装置３０によって受信される信号の品質が最も良いセル２００を管理するＤＵ２３である。 CU-CP 24 determines whether or not DC is possible for each combination of CU-UP 25 and DU 23 based on the latest resource information collected from each CU-UP 25 (S311). Then, the CU-CP 24 selects a combination of the CU-UP 25 and the DU 23 that is a transmission destination of the DC request from among the combinations of the CU-UP 25 and the DU 23 that can perform DC (S312). For example, the CU-CP 24 preferentially selects a combination including the DU 23 that manages the cell 200 having the best quality of the signal received by the terminal device 30 among the combinations of the CU-UP 25 and the DU 23 in which DC is possible. To do. In the example of FIG. 24, the DU 23-4 is the DU 23 that manages the cell 200 having the best signal quality received by the terminal device 30.
　そして、ＣＵ－ＣＰ２４は、ＤＣを依頼するＣＵ２２およびＤＵ２３の組み合わせに関する情報が含まれるＤＣ要求を、ステップＳ３１２において選択された組み合わせに含まれるＣＵ－ＵＰ２５（図２４の例ではＣＵ－ＵＰ２５－２）へ送信する（Ｓ３１３）。ＤＣ要求を受信したＣＵ－ＵＰ２５－２は、ＤＣ要求を受け入れる場合、ＤＣ要求を、ＤＣ要求に含まれる組み合わせに対応するＤＵ２３（図２４の例ではＤＵ２３－４）へ送信する（Ｓ３１４）。ＤＣ要求を受信したＤＵ２３－４は、ＤＣ要求を受け入れる場合、ＡＣＫをＣＵ－ＵＰ２５－２へ送信する（Ｓ３１５）。ＤＵ２３－４からＡＣＫを受信した場合、ＣＵ－ＵＰ２５－２は、ＡＣＫをＣＵ－ＣＰ２４へ送信する（Ｓ３１６）。そして、ＣＵ－ＵＰ２５－１およびＤＵ２３－１と、ＣＵ－ＵＰ２５－２およびＤＵ２３－４とは、連携してＤＣにより端末装置３０との無線通信を実行する。 Then, the CU-CP 24 sends a DC request including information on the combination of the CU 22 and the DU 23 that requests DC to the CU-UP 25 (CU-UP 25-2 in the example of FIG. 24) included in the combination selected in step S312. (S313). Upon receiving the DC request, the CU-UP 25-2 receives the DC request and transmits the DC request to the DU 23 (DU 23-4 in the example of FIG. 24) corresponding to the combination included in the DC request (S314). Upon receiving the DC request, the DU 23-4 transmits an ACK to the CU-UP 25-2 when accepting the DC request (S315). When ACK is received from DU 23-4, CU-UP 25-2 transmits ACK to CU-CP 24 (S316). The CU-UP 25-1 and DU 23-1, and the CU-UP 25-2 and DU 23-4 cooperate to execute wireless communication with the terminal device 30 through DC.
［実施例５の効果］
　以上、実施例５について説明した。上記したように、本実施例の基地局２０は、ＣＵ－ＣＰ２４、複数のＣＵ－ＵＰ２５、および複数のＤＵ２３を有する。ＤＵ２３の間でＤＣを行う場合、ＣＵ－ＣＰ２４は、ＤＵ２３にＤＣを依頼する前に、それぞれのＣＵ－ＵＰ２５およびＤＵ２３の組み合わせ毎に、ＤＣが可能であるか否かを示すＤＣ情報を収集する。そして、ＣＵ－ＣＰ２４は、収集されたＤＣ情報に基づいて、ＤＣを依頼するＣＵ－ＵＰ２５およびＤＵ２３の組み合わせを特定し、特定された組み合わせに含まれるＣＵ－ＵＰ２５へＤＣを依頼する。これにより、本実施例の基地局２０は、ＤＣ要求が受け入れられる可能性を高めることができ、ＤＣをより迅速に確立することができる。 [Effect of Example 5]
The fifth embodiment has been described above. As described above, the base station 20 of this embodiment includes the CU-CP 24, the plurality of CU-UPs 25, and the plurality of DUs 23. When performing DC between the DUs 23, the CU-CP 24 collects DC information indicating whether or not DC is possible for each combination of the CU-UP 25 and the DU 23 before requesting the DC to the DU 23. . Then, the CU-CP 24 specifies a combination of the CU-UP 25 and the DU 23 that requests DC based on the collected DC information, and requests the DC from the CU-UP 25 included in the specified combination. Thereby, the base station 20 of a present Example can raise possibility that a DC request | requirement will be accepted, and can establish DC more rapidly.
　上記した実施例５では、ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から所定のタイミングで送信されたリソース情報を用いて、ＤＣにより端末装置３０との通信を実行するか否かの判定、および、ＤＣの実行が可能か否かの判定の両方を行う。これに対し、本実施例６では、ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から所定のタイミングで送信された第１のリソース情報を用いて、ＤＣにより端末装置３０との通信を実行するか否かの判定を行う。また、ＤＣの実行が可能か否かの判定に用いられる第２のリソース情報は、ＤＣにより端末装置３０との通信を実行すると判定された後に収集される。 In the fifth embodiment described above, the CU-CP 24 uses the resource information transmitted at a predetermined timing from each CU-UP 25 to determine whether or not to perform communication with the terminal device 30 by DC, and Both the determination as to whether or not the DC can be executed is performed. On the other hand, in the sixth embodiment, the CU-CP 24 uses the first resource information transmitted from each CU-UP 25 at a predetermined timing to determine whether or not to execute communication with the terminal device 30 by DC. Judgment is made. Further, the second resource information used for determining whether or not DC can be executed is collected after it is determined that communication with the terminal device 30 is executed by the DC.
　例えば、バッファ容量および各インターフェイスの容量に関する情報等を第１のリソース情報として収集し、第１のリソース情報に加えて、プロセッサやメモリの使用率等を第２のリソース情報として収集する。これにより、第１のリソース情報のデータ量を、第２のリソース情報のデータ量より少なくすることができる。また、第２のリソース情報は、端末装置３０から受信されたＭＲに基づいて特定された他の基地局２０から収集される。これにより、ＣＵ－ＣＰ２４、それぞれのＣＵ－ＵＰ２５、およびそれぞれのＤＵ２３の間で、リソース情報の収集における通信トラフィックを削減することが可能となる。 For example, information on the buffer capacity and the capacity of each interface is collected as the first resource information, and in addition to the first resource information, the processor and memory usage rates are collected as the second resource information. Thereby, the data amount of 1st resource information can be made smaller than the data amount of 2nd resource information. Further, the second resource information is collected from the other base station 20 specified based on the MR received from the terminal device 30. As a result, it is possible to reduce communication traffic in the collection of resource information among the CU-CP 24, each CU-UP 25, and each DU 23.
［ＣＵ－ＣＰ２４］
　図２５は、実施例６におけるＣＵ－ＣＰ２４の一例を示すブロック図である。なお、以下に説明する点を除き、図２５において、図２０と同じ符号が付されたブロックは、図２０におけるブロックと同一または同様の機能を有するため説明を省略する。 [CU-CP24]
FIG. 25 is a block diagram illustrating an example of the CU-CP 24 according to the sixth embodiment. Except for the points described below, in FIG. 25, blocks denoted by the same reference numerals as those in FIG. 20 have the same or similar functions as the blocks in FIG.
　収集部２１１２は、それぞれのＣＵ－ＵＰ２５から送信された第１のリソース情報および第２のリソース情報を、メモリ２４２内のリソース情報２１２１に格納する。 The collection unit 2112 stores the first resource information and the second resource information transmitted from each CU-UP 25 in the resource information 2121 in the memory 242.
　ＤＣ実行判定部２１１０は、メモリ２４２内のリソース情報２１２１に含まれる第１のリソース情報を参照し、それぞれＣＵ－ＵＰ２５およびそれぞれのＤＵ２３のリソースの状態等に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。ＤＣ実行判定部２１１０は、リソース情報２１２１に第２のリソース情報が含まれていれば、それを用いてＤＣにより端末装置３０との通信を実行するか否かを判定してもよい。 The DC execution determination unit 2110 refers to the first resource information included in the resource information 2121 in the memory 242, and based on the resource statuses of the CU-UP 25 and the respective DUs 23, the DC execution determination unit 2110 communicates with the terminal device 30 by the DC. It is determined whether to execute communication. If the resource information 2121 includes the second resource information, the DC execution determination unit 2110 may determine whether to perform communication with the terminal device 30 by using the DC.
　要求部２１１１は、端末装置３０からＭＲを受信した場合、ＭＲに含まれるセル２００毎の品質情報に基づいて、第２のリソース情報を要求するリソース情報要求の送信先のＣＵ－ＵＰ２５を１つ以上特定する。そして、要求部２１１１は、特定されたＣＵ－ＵＰ２５に、通信部２４３を介してリソース情報要求を送信する。リソース情報要求には、ＤＵ２３の情報が含まれる。リソース情報要求は、例えばマルチキャストで送信される。 When receiving the MR from the terminal device 30, the request unit 2111 has one CU-UP 25 as a transmission destination of the resource information request for requesting the second resource information based on the quality information for each cell 200 included in the MR. The above is specified. Then, the request unit 2111 transmits a resource information request to the identified CU-UP 25 via the communication unit 243. The resource information request includes information on the DU 23. The resource information request is transmitted by multicast, for example.
　要求部２１１１は、例えば、信号の品質が良い順に所定数のセル２００について、それぞれのセル２００を管理するＤＵ２３と通信を行うＣＵ－ＵＰ２５を、リソース情報要求の送信先のＣＵ－ＵＰ２５として特定する。また、要求部２１１１は、例えば、信号の品質が所定の品質より良いセル２００について、それぞれのセル２００を管理するＤＵ２３と通信を行うＣＵ－ＵＰ２５を、リソース情報要求の送信先のＣＵ－ＵＰ２５として特定してもよい。 The request unit 2111 specifies, for example, a CU-UP 25 that communicates with the DU 23 that manages each cell 200 as the CU-UP 25 that is the transmission destination of the resource information for a predetermined number of cells 200 in order of good signal quality. . In addition, for example, for the cell 200 having better signal quality than the predetermined quality, the request unit 2111 sets the CU-UP 25 that communicates with the DU 23 that manages each cell 200 as the CU-UP 25 that is the transmission destination of the resource information request. You may specify.
　ＤＣ可否判定部２１１３は、メモリ２４２内のリソース情報２１２１を参照し、ＣＵ－ＵＰ２５およびＤＵ２３の組合せ毎に、ＤＣが可能か否かを判定する。ＤＣが可能か否かを判定は、第２のリソース情報に基づいて行われる。そして、ＤＣ可否判定部２１１３は、判定結果を示すＤＣ情報を、選択部２１１４へ出力する。 The DC availability determination unit 2113 refers to the resource information 2121 in the memory 242 and determines whether DC is possible for each combination of the CU-UP 25 and the DU 23. Whether or not DC is possible is determined based on the second resource information. Then, the DC availability determination unit 2113 outputs DC information indicating the determination result to the selection unit 2114.
［ＣＵ－ＵＰ２５］
　それぞれのＣＵ－ＵＰ２５は、以下に説明する点を除き、図２３において説明されたＣＵ－ＵＰ２５と同様であるため、詳細な説明を省略する。リソース管理部２１１７は、所定のタイミング毎に、通信部２５０を介して、第１のリソース情報をＣＵ－ＣＰ２４へ送信する。また、リソース管理部２１１７は、通信部２５０を介してＣＵ－ＣＰ２４からリソース情報要求を受信した場合、第２のリソース情報を、通信部２５０を介してＣＵ－ＣＰ２４へ送信する。 [CU-UP25]
Each CU-UP 25 is the same as the CU-UP 25 described with reference to FIG. 23 except for the points described below, and a detailed description thereof will be omitted. The resource management unit 2117 transmits the first resource information to the CU-CP 24 via the communication unit 250 at every predetermined timing. When the resource management unit 2117 receives a resource information request from the CU-CP 24 via the communication unit 250, the resource management unit 2117 transmits the second resource information to the CU-CP 24 via the communication unit 250.
［無線通信システム１０の処理］
　図２６は、実施例６における無線通信システム１０の処理の一例を示す図である。なお、以下に説明する点を除き、図２６において、図２４と同じ符号が付された処理は、図２４において説明された処理と同様であるため説明を省略する。 [Processing of Radio Communication System 10]
FIG. 26 is a diagram illustrating an example of processing of the wireless communication system 10 according to the sixth embodiment. Except for the points described below, in FIG. 26, the processes denoted by the same reference numerals as those in FIG. 24 are the same as the processes described in FIG.
　まず、それぞれのＤＵ２３は、第１のリソース情報に含まれる項目に該当するリソースの状態が所定量以上変化したことを検出した場合、第１のリソース情報をＣＵ－ＵＰ２５へ送信する（Ｓ３００、Ｓ３０１）。それぞれのＣＵ－ＵＰ２５は、ＤＵ２３から受信した第１のリソース情報に、第１のリソース情報に含まれる項目に該当するＣＵ－ＵＰ２５のリソースの状態を示す情報を含めてＣＵ－ＣＰ２４へ送信する（Ｓ３０２、Ｓ３０３）。ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から送信されたリソース情報を保存する。 First, when each DU 23 detects that the state of the resource corresponding to the item included in the first resource information has changed by a predetermined amount or more, it transmits the first resource information to the CU-UP 25 (S300, S301). ). Each CU-UP 25 transmits the first resource information received from the DU 23 to the CU-CP 24 including information indicating the state of the resource of the CU-UP 25 corresponding to the item included in the first resource information ( S302, S303). The CU-CP 24 stores the resource information transmitted from each CU-UP 25.
　ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から送信されたリソース情報に基づいて、ＤＣにより端末装置３０との通信を実行するか否かを判定する。そして、ＣＵ－ＣＰ２４は、ＤＣにより端末装置３０との通信を実行する決定した場合（Ｓ３０４）、ＭＲ要求を、ＤＣにより端末装置３０と通信を行うＤＵ２３－１と通信を行うＣＵ－ＵＰ２５－１へ送信する（Ｓ３０５）。 The CU-CP 24 determines whether or not to communicate with the terminal device 30 by DC based on the resource information transmitted from each CU-UP 25. When the CU-CP 24 decides to execute communication with the terminal device 30 by DC (S304), the CU-CP 24-1 communicates with the DU 23-1 that communicates with the terminal device 30 by DC. (S305).
　ＣＵ－ＵＰ２５－１からＭＲを受信した場合、ＣＵ－ＣＰ２４は、ＭＲに含まれるセル２００毎の品質情報に基づいて、リソース情報要求の送信先のＣＵ－ＵＰ２５を１つ以上特定する（Ｓ３２０）。そして、ＣＵ－ＣＰ２４は、特定されたＣＵ－ＵＰ２５にリソース情報要求を送信する（Ｓ３２１）。リソース情報要求は、例えばマルチキャストで送信される。 When receiving the MR from the CU-UP 25-1, the CU-CP 24 specifies one or more CU-UPs 25 to which the resource information request is transmitted based on the quality information for each cell 200 included in the MR (S320). . Then, the CU-CP 24 transmits a resource information request to the specified CU-UP 25 (S321). The resource information request is transmitted by multicast, for example.
　それぞれのＣＵ－ＵＰ２５は、ＣＵ－ＣＰ２４からリソース情報要求を受信した場合、リソース情報要求に含まれるＤＵ２３から第２のリソース情報を収集する（Ｓ３２２、Ｓ３２４）。そして、それぞれのＣＵ－ＵＰ２５は、ＤＵ２３から受信した第２のリソース情報に、第２のリソース情報に含まれる項目に該当するＣＵ－ＵＰ２５のリソースの状態を示す情報を含めてＣＵ－ＣＰ２４へ送信する（Ｓ３０３、Ｓ３０５）。ＣＵ－ＣＰ２４は、それぞれのＣＵ－ＵＰ２５から送信された第２のリソース情報を保存する。そして、無線通信システム１０は、ステップＳ３１１以降の処理を実行する。 When each CU-UP 25 receives the resource information request from the CU-CP 24, each CU-UP 25 collects the second resource information from the DU 23 included in the resource information request (S322, S324). Then, each CU-UP 25 transmits the second resource information received from the DU 23 to the CU-CP 24 including information indicating the resource status of the CU-UP 25 corresponding to the item included in the second resource information. (S303, S305). The CU-CP 24 stores the second resource information transmitted from each CU-UP 25. And the radio | wireless communications system 10 performs the process after step S311.
［実施例６の効果］
　以上、実施例６について説明した。上記したように、本実施例では、それぞれのＣＵ－ＵＰ２５から所定のタイミングで送信された第１のリソース情報を用いて、ＤＣにより端末装置３０との通信を実行するか否かの判定が行われる。また、ＤＣの実行が可能か否かの判定に用いられる第２のリソース情報は、ＤＣにより端末装置３０との通信を実行すると判定された後に収集される。そして、第１のリソース情報のデータ量は、第２のリソース情報のデータ量より少なくすることができる。これにより、ＣＵ－ＣＰ２４、それぞれのＣＵ－ＵＰ２５、およびそれぞれのＤＵ２３の間での、リソース情報の収集における通信トラフィックを削減することが可能となる。 [Effect of Example 6]
The example 6 has been described above. As described above, in this embodiment, it is determined whether or not communication with the terminal device 30 is executed by the DC using the first resource information transmitted from each CU-UP 25 at a predetermined timing. Is called. Further, the second resource information used for determining whether or not DC can be executed is collected after it is determined that communication with the terminal device 30 is executed by the DC. The data amount of the first resource information can be made smaller than the data amount of the second resource information. Thereby, it is possible to reduce communication traffic in the collection of resource information among the CU-CP 24, each CU-UP 25, and each DU 23.
［その他］
　なお、開示の技術は、上記した実施例に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。 [Others]
The disclosed technology is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist.
　例えば、上記した実施例４では、基地局２０ｍが他の基地局２０ｓにおけるＤＣの可否を判定したが、開示の技術はこれに限られない。例えば、実施例４においても、例えば実施例２のように他の基地局２０ｓがＤＣの可否を判定してもよい。 For example, in the above-described fourth embodiment, the base station 20m determines whether or not DC is possible in the other base station 20s, but the disclosed technique is not limited thereto. For example, also in the fourth embodiment, for example, as in the second embodiment, another base station 20s may determine whether or not DC is possible.
　また、上記した実施例４では、ＤＣの実行が決定された後に、他の基地局２０からリソース情報が収集されたが、開示の技術はこれに限られない。例えば、実施例４においても、例えば実施例３のように、ＤＣの実行が決定される前に、他の基地局２０からリソース情報が収集されてもよい。 Further, in the above-described fourth embodiment, resource information is collected from another base station 20 after the execution of DC is determined, but the disclosed technique is not limited to this. For example, also in the fourth embodiment, resource information may be collected from another base station 20 before the execution of DC is determined as in the third embodiment, for example.
　また、上記した実施例５および６では、ＣＵ－ＣＰ２４がＣＵ－ＵＰ２５を介してＣＵ－ＵＰ２５と通信を行うが、開示の技術はこれに限られず、ＣＵ－ＣＰ２４とそれぞれのＤＵ２３とは、Ｆ１－Ｃインターフェイスを介して通信を行ってもよい。 In the fifth and sixth embodiments described above, the CU-CP 24 communicates with the CU-UP 25 via the CU-UP 25. However, the disclosed technology is not limited to this, and the CU-CP 24 and each DU 23 are F1. You may communicate via the -C interface.
　また、上記した実施例５および６では、１つの基地局２０内のＤＵ２３間でのＤＣの実行を例に説明したが、開示の技術はこれに限られない。例えば、異なる基地局２０内に設けられたＤＵ２３間で、ＤＣが実行される場合においても、実施例５または６に開示された技術を適用することができる。 In the fifth and sixth embodiments described above, the execution of DC between the DUs 23 in one base station 20 has been described as an example, but the disclosed technology is not limited to this. For example, even when DC is performed between DUs 23 provided in different base stations 20, the technique disclosed in the fifth or sixth embodiment can be applied.
　また、上記した実施例５および６では、ＣＵ－ＣＰ２４がＤＣを実行するか否かを判定するが、開示の技術はこれに限られず、それぞれのＣＵ－ＵＰ２５が、ＤＣを実行するか否かを判定してもよい。 In the fifth and sixth embodiments described above, it is determined whether or not the CU-CP 24 executes DC. However, the disclosed technique is not limited to this, and whether or not each CU-UP 25 executes DC. May be determined.
　また、上記した実施例５および６では、ＣＵ－ＣＰ２４がＣＵ－ＵＰ２５およびＤＵ２３の組み合わせのそれぞれにおけるＤＣの可否を判定したが、開示の技術はこれに限られない。例えば、ＣＵ－ＣＰ２４は、ＤＣ判定要求をそれぞれのＣＵ－ＵＰ２５へ送信し、それぞれのＣＵ－ＵＰ２５が、ＣＵ－ＵＰ２５およびＤＵ２３のそれぞれの組み合わせについてのＤＣの可否を判定してもよい。 In Embodiments 5 and 6 described above, the CU-CP 24 determines whether or not DC is possible in each combination of the CU-UP 25 and the DU 23, but the disclosed technology is not limited thereto. For example, the CU-CP 24 may transmit a DC determination request to each CU-UP 25, and each CU-UP 25 may determine whether or not DC is possible for each combination of the CU-UP 25 and the DU 23.
　また、上記した各実施例において、基地局２０内の各ブロックは、独立した計算機により実現されてもよく、１つ以上のメモリおよびプロセッサを有する１つの計算機によって実現されてもよい。 In each embodiment described above, each block in the base station 20 may be realized by an independent computer, or may be realized by one computer having one or more memories and processors.
　また、上記した各実施例において、基地局２０が有するそれぞれの処理ブロックは、実施例におけるそれぞれの装置の理解を容易にするために、主な処理内容に応じて機能別に区分したものである。そのため、処理ブロックの区分方法やその名称によって、開示の技術が制限されることはない。また、基地局２０がそれぞれ有する各処理ブロックは、処理内容に応じてさらに多くの処理ブロックに細分化することもできるし、複数の処理ブロックを１つの処理ブロックに統合することもできる。また、それぞれの処理ブロックによって実行される処理の一部または全部は、ソフトウェアによる処理として実現されてもよく、ＡＳＩＣ（Application　Specific　Integrated　Circuit）等の専用のハードウェアにより実現されてもよい。 In each of the above-described embodiments, each processing block of the base station 20 is classified by function according to main processing contents in order to facilitate understanding of each device in the embodiment. For this reason, the disclosed technique is not limited by the processing block classification method and its name. In addition, each processing block of the base station 20 can be subdivided into a larger number of processing blocks according to the processing content, or a plurality of processing blocks can be integrated into one processing block. In addition, part or all of the processing executed by each processing block may be realized as software processing, or may be realized by dedicated hardware such as ASIC (Application Specific Integrated Circuit).
１０　無線通信システム
１１　コアネットワーク
２０　基地局
２００　セル
２１０　通信部
２１１　制御部
２１１０　ＤＣ実行判定部
２１１１　要求部
２１１２　収集部
２１１３　ＤＣ可否判定部
２１１４　選択部
２１１５　ＤＣ処理部
２１１６　無線通信制御部
２１１７　リソース管理部
２１１８　無線通信制御部
２１２　メモリ
２１２０　基地局情報
２１２１　リソース情報
２１３　無線部
２１４　アンテナ
２２　ＣＵ
２２０　通信部
２２１　制御部
２２２　メモリ
２２３　通信部
２３　ＤＵ
２３０　通信部
２３１　無線部
２３２　制御部
２３３　メモリ
２３４　アンテナ
２４　ＣＵ－ＣＰ
２４０　通信部
２４１　制御部
２４２　メモリ
２４３　通信部
２５　ＣＵ－ＵＰ
２５０　通信部
２５１　制御部
２５２　メモリ
２５３　通信部
３０　端末装置
３１　アンテナ
３２　無線部
３３　制御部
３３０　測定部
３３１　ＭＲ処理部
３３２　ＤＣ処理部
３３３　無線通信制御部
３４　メモリ
４０　ＭＲ
５０　リソース情報
５１　リソース情報 10 wireless communication system 11 core network 20 base station 200 cell 210 communication unit 211 control unit 2110 DC execution determination unit 2111 request unit 2112 collection unit 2113 DC availability determination unit 2114 selection unit 2115 DC processing unit 2116 radio communication control unit 2117 resource management unit 2118 Radio communication control unit 212 Memory 2120 Base station information 2121 Resource information 213 Radio unit 214 Antenna 22 CU
220 Communication Unit 221 Control Unit 222 Memory 223 Communication Unit 23 DU
230 Communication Unit 231 Radio Unit 232 Control Unit 233 Memory 234 Antenna 24 CU-CP
240 communication unit 241 control unit 242 memory 243 communication unit 25 CU-UP
250 communication unit 251 control unit 252 memory 253 communication unit 30 terminal device 31 antenna 32 radio unit 33 control unit 330 measurement unit 331 MR processing unit 332 DC processing unit 333 radio communication control unit 34 memory 40 MR
50 Resource information 51 Resource information

Claims (11)

  1. 　無線通信の接続を制御することが可能な通信制御装置において、
    　第１の無線周波数を用いた端末装置との通信を制御する、または、接続する無線装置を介して端末装置との通信を制御する無線通信制御部と、
    　他の通信制御装置に対して、前記第１の無線周波数と異なる第２の無線周波数を用いて前記端末装置との通信可否に関する制御情報を要求する信号を送信する送信部と、
    　前記他の通信制御装置から前記制御情報を含む信号を受信する受信部と、
    　前記他の通信制御装置から前記第２の無線周波数を用いて前記端末装置と通信を行う一の通信制御装置を選択する選択部と
    　を有し、
    　前記送信部は、
    　前記一の通信制御装置に前記第２の無線周波数を用いた前記端末装置と通信に関する情報を含む制御信号を送信することを特徴とする通信制御装置。     In a communication control apparatus capable of controlling connection of wireless communication,
    A wireless communication control unit for controlling communication with the terminal device using the first radio frequency, or for controlling communication with the terminal device via the connected wireless device;
    A transmission unit that transmits a signal requesting control information regarding whether communication with the terminal device is possible using a second radio frequency different from the first radio frequency to another communication control device;
    A receiving unit for receiving a signal including the control information from the other communication control device;
    A selection unit that selects one communication control device that communicates with the terminal device using the second radio frequency from the other communication control device;
    The transmitter is
    A communication control apparatus, wherein a control signal including information related to communication with the terminal apparatus using the second radio frequency is transmitted to the one communication control apparatus.
  2. 　前記選択部は、
    　前記端末装置との無線回線品質が所要の無線回線品質を満たす前記一の通信制御装置を選択することを特徴とする請求項１に記載の通信制御装置。     The selection unit includes:
    The communication control device according to claim 1, wherein the one communication control device that satisfies a required radio channel quality is selected as a radio channel quality with the terminal device.
  3. 　前記送信部は、
    　前記一の通信制御装置が使用する無線リソースに関するリソース情報を要求する信号を送信し、
    　前記受信部は、
    　前記他の通信制御装置から前記リソース情報を受信し、
    　前記通信制御装置は、
    　前記第２の無線周波数および前記リソース情報を用いた前記端末装置との通信を制御する制御部を有することを特徴とする請求項１に記載の通信制御装置。     The transmitter is
    Transmitting a signal for requesting resource information related to radio resources used by the one communication control device;
    The receiver is
    Receiving the resource information from the other communication control device;
    The communication control device includes:
    The communication control apparatus according to claim 1, further comprising a control unit that controls communication with the terminal apparatus using the second radio frequency and the resource information.
  4. 　前記送信部は、
    　前記端末装置において測定された信号の品質が良い順に所定数のセルについて、それぞれの前記セルを管理する前記他の通信制御装置に、前記無線リソースに関するリソース情報を要求する信号を送信することを特徴とする請求項３に記載の通信制御装置。     The transmitter is
    A signal requesting resource information regarding the radio resource is transmitted to the other communication control device that manages each of the predetermined number of cells in order of good signal quality measured in the terminal device. The communication control device according to claim 3.
  5. 　前記送信部は、
    　前記端末装置において測定された信号の品質が所定の品質より良いセルについて、それぞれの前記セルを管理する前記他の通信制御装置に、前記無線リソースに関するリソース情報を要求する信号を送信することを特徴とする請求項３に記載の通信制御装置。     The transmitter is
    A signal requesting resource information regarding the radio resource is transmitted to the other communication control device that manages each of the cells for which the quality of the signal measured in the terminal device is better than a predetermined quality. The communication control device according to claim 3.
  6. 　前記第２の無線周波数により前記端末装置との通信を実行するか否かを判定する判定部を有し、
    　前記受信部は、
    　前記判定部によって前記第２の無線周波数により前記端末装置との通信を実行すると判定される前に、前記無線リソースに関するリソース情報を前記他の通信制御装置から受信し、
    　前記選択部は、
    　前記判定部が前記第２の無線周波数により前記端末装置との通信を実行すると判定した場合、前記受信部によって受信された前記他の通信制御装置の最新の前記リソース情報に応じて、前記一の通信制御装置を選択することを特徴とする請求項３に記載の通信制御装置。     A determination unit that determines whether to perform communication with the terminal device using the second radio frequency;
    The receiver is
    Before it is determined by the determination unit to execute communication with the terminal device at the second radio frequency, resource information related to the radio resource is received from the other communication control device,
    The selection unit includes:
    When the determination unit determines to execute communication with the terminal device using the second radio frequency, the one of the other communication control devices received by the reception unit according to the latest resource information. The communication control apparatus according to claim 3, wherein a communication control apparatus is selected.
  7. 　前記受信部は、
    　前記他の通信制御装置において、前記リソース情報で示される無線リソースが所定量以上変化した場合に、前記リソース情報を受信することを特徴とする請求項６に記載の通信制御装置。     The receiver is
    The communication control apparatus according to claim 6, wherein the other communication control apparatus receives the resource information when a radio resource indicated by the resource information changes by a predetermined amount or more.
  8. 　前記送信部は、
    　前記第２の無線周波数による通信が可能か否かの判定を要求する判定要求を送信し、
    　前記選択部は、
    　前記他の通信制御装置から取得した、前記第２の無線周波数による通信が可能か否かの判定結果に基づいて、前記一の通信制御装置を選択することを特徴とする請求項１に記載の通信制御装置。     The transmitter is
    Transmitting a determination request for requesting determination as to whether communication by the second radio frequency is possible;
    The selection unit includes:
    The said one communication control apparatus is selected based on the determination result of whether the communication by the said 2nd radio frequency acquired from the said other communication control apparatus is possible. Communication control device.
  9. 　前記判定要求には、
    　前記第２の無線周波数による通信において前記他の通信制御装置に割り当てられる通信トラフィックに関する情報が含まれることを特徴とする請求項８に記載の通信制御装置。     In the determination request,
    9. The communication control apparatus according to claim 8, further comprising information related to communication traffic allocated to the other communication control apparatus in communication using the second radio frequency.
  10. 　通信制御装置に接続し、第１の無線周波数を用いて端末装置と通信を行う無線装置において、
    　他の通信制御装置の中から、第２の無線周波数を用いて通信する一の通信制御装置が選択され、前記端末装置との間の通信トラフィックのうち、前記第２の無線周波数で用いる前記一の通信制御装置の通信トラフィックを除いた残りの通信トラフィックに応じてデータを無線通信により前記端末装置との間で送受信する無線部を有することを特徴とする無線装置。     In a wireless device that connects to a communication control device and communicates with a terminal device using a first wireless frequency,
    One communication control device that communicates using the second radio frequency is selected from the other communication control devices, and the one that is used at the second radio frequency among the communication traffic with the terminal device. A wireless device comprising: a wireless unit that transmits and receives data to and from the terminal device by wireless communication according to the remaining communication traffic excluding communication traffic of the communication control device.
  11. 　複数の基地局と、
    　端末装置と
    　を備え、
    　前記基地局は、
    　第１の無線周波数を用いた端末装置との通信を制御する、または、接続する無線装置を介して端末装置との通信を制御する無線通信制御部と、
    　他の基地局に対して、前記第１の無線周波数と異なる第２の無線周波数を用いて前記端末装置との通信可否に関する制御情報を要求する信号を送信する送信部と、
    　前記他の基地局から前記制御情報を含む信号を受信する受信部と、
    　前記他の基地局から前記第２の無線周波数を用いて前記端末装置と通信を行う一の基地局を選択する選択部と
    　を有し、
    　前記送信部は、
    　前記一の基地局に前記第２の無線周波数を用いた前記端末装置と通信に関する情報を含む制御信号を送信することを特徴とする無線通信システム。     Multiple base stations,
    A terminal device, and
    The base station
    A wireless communication control unit for controlling communication with the terminal device using the first radio frequency, or for controlling communication with the terminal device via the connected wireless device;
    A transmitting unit that transmits a signal requesting control information regarding whether communication with the terminal device is possible using a second radio frequency different from the first radio frequency to another base station;
    A receiving unit for receiving a signal including the control information from the other base station;
    A selection unit that selects one base station that communicates with the terminal device using the second radio frequency from the other base station;
    The transmitter is
    A radio communication system, wherein a control signal including information related to communication with the terminal device using the second radio frequency is transmitted to the one base station.
PCT/JP2018/014011 2018-03-30 2018-03-30 Communication control device, wireless device, and wireless communication system WO2019187163A1 (en)

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