WO2009107413A1 - 無線通信方法、基地局装置および無線通信システム - Google Patents
無線通信方法、基地局装置および無線通信システム Download PDFInfo
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- WO2009107413A1 WO2009107413A1 PCT/JP2009/050364 JP2009050364W WO2009107413A1 WO 2009107413 A1 WO2009107413 A1 WO 2009107413A1 JP 2009050364 W JP2009050364 W JP 2009050364W WO 2009107413 A1 WO2009107413 A1 WO 2009107413A1
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- 238000004891 communication Methods 0.000 title claims description 65
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- 238000011144 upstream manufacturing Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 16
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- 238000004088 simulation Methods 0.000 description 7
- 125000004122 cyclic group Chemical group 0.000 description 5
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
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- 108700026140 MAC combination Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/02—Hybrid access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the present invention relates to a radio communication method, a base station apparatus, and a radio communication system that enable dynamic band allocation.
- the network in such a situation is composed of base stations connected to a fixed network and a large number of wireless terminals scattered in a wide area, and the wireless terminals are directly accommodated in the base stations.
- the wireless terminal in such a network is a battery-powered terminal having a low power consumption and a low function having only minimum functions such as data measurement and transmission of the measured data.
- Such traffic from a wireless terminal to a base station is characterized by (1) a small amount of data and (2) a relatively long transmission interval.
- a dynamic slot assignment (DSA) method which is one of centralized control methods with high resource utilization efficiency, is used.
- DSA dynamic slot assignment
- TDMA-TDD Time Division Multiple Access-Time Division Duplex
- a base station dynamically allocates slots (bandwidths) according to a request from a wireless terminal.
- FIG. 21 shows an example of the MAC frame configuration.
- the MAC frame is divided into an uplink and a downlink, the downlink is composed of a broadcast section and a demand assignment section, and the uplink is composed of a demand assignment section and a random access section.
- each section includes Bch (Broadcast control channel: broadcast control channel), Fch (Frame control channel: frame control channel), RFch (Random access Feedback channel: Random access feedback channel) ), Cch (Control Channel: control channel), Dch (Data Channel: data channel), and Rch (Random Access Channel: random access channel) channels are used.
- Bch Broadcast control channel: broadcast control channel
- Fch Frae control channel: frame control channel
- RFch Random access Feedback channel: Random access feedback channel
- Cch Control Channel: control channel
- Dch Data Channel: data channel
- Rch Random Access Channel
- Bch is used to notify base station attribute information (base station ID, frame number, etc.) to the wireless terminal.
- the Fch is used to notify band assignment information (a wireless terminal that has performed allocation, an allocation start position, an allocated channel type, an allocated bandwidth amount, etc.) in a demand assignment section in which bandwidth allocation is performed in units of wireless terminals.
- RFch is used to notify random access information (random access result of previous frame, start position of random access in this frame, number of slots, etc.).
- the Cch is used to transmit and receive control information for each wireless terminal such as a bandwidth request (Resource Request, RREQ) and ARQ (Automatic Repeat Request, automatic retransmission request).
- Dch is used for transmitting and receiving user data.
- Rch is a channel for random access, and is used for a wireless terminal to transmit a bandwidth request (RREQ).
- the dynamic slot allocation method includes an access method that uses random access for a wireless terminal to make a bandwidth request to a base station. Since this method can flexibly and efficiently accommodate non-periodic data generated in bursts, it is widely applied as a dynamic slot allocation method that satisfies the above requirements.
- FIG. 22 shows an example of an access sequence using this method.
- the base station transmits Bch, Fch, and RFch in order from the beginning of the MAC frame. By receiving the RFch, the wireless terminal under the base station can know the Rch start position and the number of slots in the frame.
- the wireless terminal When the wireless terminal has data to be transmitted, the wireless terminal transmits the bandwidth request information (RREQ) for requesting the bandwidth for data transmission to the base station using the Rch, and thus the wireless terminal is based on an exponential backoff algorithm.
- RREQ bandwidth request information
- a back-off time that is a transmission standby time is autonomously determined in order to avoid a collision with another wireless terminal.
- the wireless terminal transmits the RREQ using the corresponding Rch (MAC Frame 1 in FIG. 22).
- MAC Frame 1 MAC Frame 1 in FIG. 22
- retransmission is performed.
- the base station successfully receives the RREQ
- the base station notifies the RF channel of the next frame (MAC Frame 2 in FIG. 22) of the successful reception of the RREQ, and allocates a Dch corresponding to the bandwidth request value from the RREQ.
- an ARQ Cch is assigned to transmit arrival confirmation for data to the wireless terminal.
- Non-patent document 1 is known as such a prior art.
- the traffic requiring low delay time transmission is defined as a priority class
- the IBW (Initial Back Off Window) size which is an access parameter in the random access area, is set to a value smaller than that of the non-priority class, so
- AWA 5GHz Band Advanced Wireless Access
- the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a bandwidth request message used for a predetermined event such as an event for which immediacy is required, to a base station device by a wireless terminal device.
- An object of the present invention is to provide a radio communication method, a base station apparatus, and a radio communication system that can transmit with a low delay time.
- a plurality of wireless terminal devices are connected to a base station device through a common wireless line, and the base station device is a section to which a bandwidth has been allocated in an uplink communication band within a wireless frame. Is assigned as a demand assignment section, and the remaining section is managed as a random access section, and a requested uplink communication band is allocated to the bandwidth request information from the wireless terminal apparatus, and the wireless terminal apparatus generates data to be transmitted.
- the bandwidth request information is transmitted to a random slot in the random access section, and when the transmission is successful, the data is transmitted using the bandwidth allocated from the base station device.
- the frame further includes a shared slot for transmitting notification information of occurrence of a predetermined event, and the wireless terminal device is configured to transmit the shared slot.
- the event generation transmission step of transmitting information notifying that the predetermined event has occurred in the wireless terminal device to the base station device, and the base station device transmitted in the event generation transmission step.
- Random slot assignment for determining the number of random slots to be assigned as random slots for transmitting the bandwidth request information based on the predetermined event, out of random slots in the random access section, based on occurrence of a predetermined event Step, information on the allocated random slot, the allocation information transmission step that the base station apparatus transmits to the wireless terminal device, and the information on the allocated random slot transmitted by the allocation information transmission step,
- the wireless terminal device may include the random slot allocation. Using the random slots assigned in the step, and a bandwidth request step of transmitting the bandwidth request information to the base station apparatus.
- the base station apparatus when the base station apparatus is notified in the random slot allocation step that a predetermined event has occurred in the event generation and transmission step, the base station apparatus The number of random slots to be allocated may be changed.
- the base station device has information notifying that the predetermined event transmitted from the wireless terminal device in the event generation transmission step has occurred in the random slot allocation step.
- the number of random slots assigned as random slots to the wireless terminal device may be changed based on whether or not it is retransmitted.
- the shared slot has a first shared slot and a second shared slot
- the wireless terminal device performs the predetermined event in the event generation and transmission step. If the information notifying that the event has occurred is not retransmission to the base station device, the information is transmitted using the first shared slot, and the information notifying that the predetermined event has occurred is the base station device. In the case of re-sending, the second slot may be used for transmission.
- the base station apparatus of the present invention connects a plurality of wireless terminal apparatuses through a common wireless line, and among the uplink communication bands in the radio frame, the allocated band section is a demand assignment section, and the remaining sections are random
- a base station device that manages as an access section and allocates a requested uplink communication band to the bandwidth request information from the wireless terminal device, wherein the wireless frame further transmits occurrence notification information of a predetermined event
- a base station receiving unit for receiving information transmitted from the wireless terminal device using the shared slot and notifying that the predetermined event has occurred, and receiving the base station Based on the occurrence of the predetermined event received by the unit, the predetermined event among the random slots in the random access section.
- a base station transmission / reception management unit that determines the number of random slots to be allocated as random slots for transmitting the bandwidth request information based on the base station device, and the base station device transmits information on the allocated random slots to the wireless terminal device A base station transmitter.
- the base station transmission / reception management unit allocates to the radio terminal apparatus when the base station reception unit receives from the radio terminal apparatus that a predetermined event has occurred.
- the number of random slots may be changed.
- the base station transmission / reception management unit is retransmitted with the information transmitted from the wireless terminal apparatus and informing that the predetermined event received by the base station reception unit has occurred.
- the number of random slots assigned as random slots to the wireless terminal device may be changed based on whether or not the number is random.
- a plurality of wireless terminal devices are connected to a base station device via a common wireless channel, and the base station device is a section to which a bandwidth has been allocated in an uplink communication band within a wireless frame. Is assigned as a demand assignment section, and the remaining section is managed as a random access section, and a requested uplink communication band is allocated to the bandwidth request information from the wireless terminal apparatus, and the wireless terminal apparatus generates data to be transmitted.
- the bandwidth request information is transmitted to a random slot in the random access section, and when the transmission is successful, the wireless communication system transmits the data using a bandwidth allocated from the base station device.
- the frame further includes a shared slot for transmitting the occurrence notification information of a predetermined event, the wireless terminal device An event occurrence notification unit for transmitting information indicating that the predetermined event has occurred in the wireless terminal device to the base station device, and random slot allocation information transmitted from the base station device. And a bandwidth request unit that transmits the bandwidth request information to the base station device using a random slot, and the base station device is transmitted from the wireless terminal device using the shared slot.
- a base station receiving unit that receives information notifying that the predetermined event has occurred in the wireless terminal device, and based on the occurrence of the predetermined event received by the base station receiving unit, Assigned as a random slot for transmitting the bandwidth request information based on the predetermined event among the random slots
- a base station transceiver management unit to determine the number of random slots, the information of the allocated random slot, and the base station transmitting unit which the base station apparatus transmits to the wireless terminal device.
- the base station transmission / reception management unit allocates a predetermined event to the wireless terminal device when the base station receiving unit receives from the wireless terminal device that a predetermined event has occurred.
- the number of random slots may be changed.
- the base station transmission / reception management unit is retransmitted with the information transmitted from the wireless terminal device and notified by the base station reception unit that the predetermined event has occurred.
- the number of random slots assigned as random slots to the wireless terminal device may be changed based on whether or not the number is random.
- the shared slot has a first shared slot and a second shared slot
- the event occurrence notifying unit notifies that the predetermined event has occurred.
- the information is not a retransmission to the base station apparatus
- the information is transmitted using the first shared slot
- the information notifying that the predetermined event has occurred is a retransmission to the base station apparatus May be transmitted using the second slot.
- a bandwidth request message used for a predetermined event such as an event that requires immediacy can be transmitted from the wireless terminal device to the base station device with a low delay time.
- 1 is a schematic block diagram showing a wireless communication system according to a first embodiment of the present invention. It is a functional block diagram which shows the structure of the base station 1 of the 1st Embodiment of this invention. It is a functional block diagram which shows the structure of the radio
- FIG. 1 is a schematic block diagram showing a wireless communication system according to the first embodiment of the present invention.
- the wireless communication system includes a base station 1 and wireless terminals 2-1 to 2-N (hereinafter referred to as a wireless terminal 2 when representatively described as a wireless terminal).
- the base station is also referred to as a base station device.
- a wireless terminal is also referred to as a wireless terminal device.
- the base station 1 is connected to the wired network 4.
- a server 3 is connected to the wired network 4.
- the base station 1 can communicate with the server 3 via the wired network 4.
- FIG. 2 is a functional block diagram showing the configuration of the base station 1 according to the first embodiment of this invention.
- the base station 1 includes a base station transmission / reception unit 11, a base station frame generation / decomposition unit 12, a base station transmission / reception management unit 13, a base station shared slot management unit 14, a base station transmission / reception control unit 15, and a bandwidth management unit. 16.
- the base station transmission / reception unit 11 transmits / receives data to / from a terminal transmission / reception unit 21 of the wireless terminal 2 described later.
- the base station frame generation / decomposition unit 12 performs decoding using the encryption key. In addition, it checks whether the received data is correct by using CRC (Cyclic Redundancy Check) for the received frame (PDU: Protocol Data Unit).
- the base station transmission / reception management unit 13 manages data transmission / reception in the base station.
- the base station shared slot management unit 14 manages PDUs of shared slots, which will be described later.
- the base station transmission / reception control unit 15 calculates data transmission / reception timing.
- the bandwidth management unit 16 manages a wireless bandwidth used for communication. In FIG. 2, solid arrows indicate the flow of data, and broken arrows indicate the flow of control signals.
- FIG. 3 is a functional block diagram showing the configuration of the wireless terminal 2 according to the first embodiment of this invention.
- the wireless terminal 2 includes a terminal transmission / reception unit 21, a terminal frame generation / decomposition unit 22, a terminal transmission / reception management unit 23, a terminal shared slot management unit 24, and a terminal transmission / reception control unit 25.
- the terminal transmission / reception unit 21 transmits / receives data to / from the base station transmission / reception unit 11 of the base station 1.
- the terminal transmission / reception management unit 23 manages data transmission / reception in the wireless terminal 2.
- the terminal shared slot management unit 24 specifies a shared slot position that can be used for transmission from the shared slot information.
- the terminal transmission / reception management unit 25 calculates the transmission timing from the shared slot position specified by the terminal shared slot management unit 24.
- the frame generation / decomposition unit 22 generates a frame (PDU) from the data to be transmitted.
- solid arrows indicate the flow of data
- broken arrows indicate the flow of control signals.
- FIG. 4 is a configuration diagram showing a MAC frame configuration including a shared slot in the first embodiment of the present invention.
- the MAC frame is divided into an uplink and a downlink, the downlink is composed of a broadcast section and a demand assignment section, and the uplink is composed of a demand assignment section, a random access section, and a shared section. Yes.
- the shared slot included in the shared section is a slot used by the base station 1 to detect that traffic belonging to the priority class has occurred. The detection method will be described later.
- the number of shared slots included in the shared section is one or more for one priority class. In this embodiment, the number of priority classes is 1, and the number of shared slots is 1.
- the random access section is classified into Rch belonging to the priority class and Rch belonging to the non-priority class.
- the priority class is a class to which an Rch used for an event that always requires transmission with a low delay time (an event that requires immediacy) belongs.
- the non-priority class is a class to which Rch other than the Rch belonging to the priority class belongs.
- the ratio of Rch belonging to the priority class and Rch belonging to the non-priority class in the random access section changes dynamically according to the traffic of events belonging to the priority class (events requiring immediacy). Let This dynamic changing method will be described later.
- an event that requires immediacy is, for example, an event for which the wireless terminal 2 must immediately transmit information about the event to the base station 1 collecting the event information.
- an event in which an abnormality occurs in an object that the wireless terminal 2 is monitoring or observing and the wireless terminal 2 must immediately transmit an abnormal state to the base station 1 requires immediacy.
- each section includes Bch (Broadcast control channel: broadcast control channel), Fch (Frame control channel: frame control channel), RFch (Random access Feedback channel: Random access feedback channel) ), Cch (Control Channel: control channel), Dch (Data Channel: data channel), and Rch (Random Access Channel: random access channel) channels are used.
- Bch Broadcast control channel: broadcast control channel
- Fch Frae control channel: frame control channel
- RFch Random access Feedback channel: Random access feedback channel
- Cch Control Channel: control channel
- Dch Data Channel: data channel
- Rch Random Access Channel
- the shared section is arranged behind the random access section, but it is not specified at this position.
- one shared slot is arranged for one priority class, but a plurality of shared slots may be arranged for one priority class.
- the shared slots may be distributed and arranged in the MAC frame. In addition, it is assumed that the shared slot arrangement information is reported from the base station 1.
- FIG. 5A is a diagram showing information elements and contents transmitted in the shared slot of this embodiment.
- the content of the information element “Data (data)” is “the same bit sequence for each event”
- the content of the information element “FCS (Frame Check Sequence, frame check sequence)” is “ CRC (Cyclic Redundancy Check) is used.
- FCS is generated based on Data.
- a PDU is composed of two information elements, Data and FCS, and Data is data that can be identified for each event.
- FCS is also common for each event. That is, the PDU is common for each event.
- the PDU after encryption becomes the same, so the PDU can be encrypted and used.
- the PDU is not specified in this configuration.
- FIG. 5B is a diagram showing information elements and contents transmitted in the shared slot.
- the content of the information element “Data (data)” is “the same bit sequence for each event”
- the content of the information element “FCS (Frame Check Sequence, frame check sequence)” is “ CRC (Cyclic Redundancy Check) is used, and FCS is generated based on Data.
- the content of the information element “Terminal Data” is “a bit sequence different for each terminal”, and the content of the information element “Terminal FCS (Frame Check Sequence, frame check sequence)” is “CRC (Cyclic Redundancy Check, Cyclic Redundancy Check)”.
- CRC Cyclic Redundancy Check
- the terminal FCS is generated based on the terminal Data.
- the base station 1 that has received “terminal Data” via the shared slot can know from which wireless terminal 2 the frame has been sent.
- the base station 1 that has received the frame can confirm whether or not the “terminal Data” is broken during transmission by checking the “terminal Data” with the CRC.
- “terminal Data” is broken during transmission, it can be seen that there is a possibility that the wireless terminal 2 other than the wireless terminal 2 that transmitted the frame that has reached the base station 1 has transmitted the frame to the same shared slot.
- the wireless terminal 2 transmits a PDU to the shared slot corresponding to the event to be transmitted.
- Information on the shared slot in the MAC frame (shared slot information) is reported to the wireless terminal 2 by the base station 1 using RFch.
- the wireless terminal 2 acquires the shared slot information notified by the base station 1, identifies the shared slot corresponding to the event to be transmitted, and determines that an event requiring immediacy has occurred using the identified shared slot. Notify station 1.
- FIG. 6 is a diagram showing the event type and slot information of the shared slot information in the first embodiment of the present invention.
- the slot information whose event type is “event 1” is “slot information 1 (start position)”
- the slot information whose event type is “event N” is “slot information N (start position)”. ) ”.
- the event type and slot information are paired so that the shared slot corresponding to the event can be specified.
- the slot information is information that can specify the transmission position such as the start position of the slot. If a plurality of shared slots are arranged for an event that requires one immediacy, the slot information describes the slot information of each shared slot. Further, the format of the shared slot information is not specified in this configuration.
- FIG. 7 shows the flow of transmission processing in the wireless terminal 2 when the wireless terminal 2 notifies the base station 1 that an event requiring immediateness (hereinafter referred to as an immediate event) has occurred. It is a flowchart.
- the terminal transmission / reception management unit 23 acquires shared slot information based on the data received by the terminal transmission / reception unit 11 from the base station 1 (step S101). Subsequently, the terminal transmission / reception management unit 23 notifies the terminal shared slot management unit 24 of the shared slot information.
- the terminal shared slot management unit 24 identifies the shared slot start position corresponding to the immediate event (hereinafter referred to as the shared slot start position) from the shared slot information, and the terminal transmission / reception management unit 23 identifies the shared slot start position and the type of immediate event. (Step S102).
- the terminal transmission / reception management unit 23 notifies the terminal transmission / reception control unit 25 of the shared slot start position.
- the terminal transmission / reception control unit 25 calculates the transmission timing of data for notifying that an immediate event has occurred from the shared slot start position.
- the terminal transmission / reception management unit 23 notifies the terminal frame generation / decomposition unit 22 of the type of immediate event.
- the terminal frame generation / decomposition unit 22 generates a PDU from the type of immediate event and notifies the terminal transmission / reception unit 21 (step S103).
- the terminal transmission / reception unit 21 transmits the PDU to the base station 1 at a timing instructed by the terminal transmission / reception control unit 25 (step S104) and ends the process.
- FIG. 8 is a flowchart showing the flow of reception processing at the base station 1 when the wireless terminal 2 notifies the base station 1 that an immediate event has occurred.
- the base station transmission / reception unit 11 receives data of the shared slot based on an instruction from the base station transmission / reception control unit 15 (step S201).
- the base station frame generation / decomposition unit 12 uses the encryption key to decrypt it.
- a CRC check is performed on the data in the received PDU (step S202). If the CRC check is correct, the process proceeds to step S204; otherwise, the process proceeds to step S208 (step S203).
- step S204 the base station frame generation / decomposition unit 12 notifies the base station shared slot management unit 14 of the data in the PDU via the base station transmission / reception management unit 13.
- the base station shared slot management unit 14 collates whether or not the notified data is the same as the data of the immediate event corresponding to the received shared slot (step S204). If the notified data and the data of the immediate event corresponding to the received shared slot are the same, the process proceeds to step S206, and if not, the process proceeds to step S208 (step S205).
- step S206 the shared slot management unit 24 determines that an immediate event corresponding to the shared slot that has received the PDU has been notified, and then the shared slot management unit 24 supports the shared slot that has received the PDU.
- the base station transmission / reception management unit 23 is notified of information notified that an immediate event has occurred (step S206).
- a CRC check is performed on the received terminal information using the terminal FCS. If the CRC check is correct, it can be seen that there is one wireless terminal 2 that has transmitted data to the shared slot. If the CRC check is not correct, it can be seen that there are a plurality of wireless terminals 2 that have transmitted data to the shared slot.
- step S207 the base station transmission / reception management unit 23 activates control corresponding to the notified immediate event (step S207) and ends the process.
- Control corresponding to an immediate event is processing in steps S901 to S903 described later in the present embodiment.
- step S208 the base station shared slot management unit 24 determines that an immediate event corresponding to the shared slot that received the PDU has not been notified (step S208), and ends the process.
- the base station 1 dynamically changes the ratio of Rch belonging to the priority class and non-priority class in the random access section.
- FIG. 9 is a flowchart showing a procedure in which the base station 1 dynamically changes the ratio of Rch belonging to the priority class and non-priority class in the random access section in the first embodiment of the present invention.
- Step S901 When the shared slot is accessed, the base station transmission / reception management unit 23 of the base station 1 determines that there is an access of a priority class corresponding to the accessed shared slot. Thereafter, the process proceeds to step S902.
- Step S902 The base station transmission / reception management unit 23 determines the number of preferential RAs in the random access area in the next frame based on the traffic (access) situation and preferential RA (random access) control information determined in step S901. Thereafter, the process proceeds to step S903.
- a method for determining the number of priority RAs will be described in a first specific example and a second specific example described later.
- Step S903 The base station transmission / reception management unit 23 instructs the access method for the wireless terminal 2 that has made an access belonging to the priority class, based on the priority RA number determined in step S902. Thereafter, the process ends.
- the base station 1 notifies the priority RA number determined in step S902 and the access method determined in step S903 as priority RA control information to all the wireless terminals 2 connected to the base station 1. For example, the base station 1 notifies the priority RA control information by broadcast to all the wireless terminals 2 connected to the base station 1 using RFch.
- FIG. 10 is a diagram showing priority RA control information in the first embodiment of the present invention.
- the priority RA control information includes a priority class, the number of RAs, and an access instruction as attributes.
- N priority classes from No. 1 to N are set.
- Each class includes an RA number that is the number of slots allocated to the priority class in the RA, and an access instruction.
- the access instruction is indicated by two values. When the value of the access instruction is “0”, it indicates that a method of transmitting the RREQ using one frame is indicated. When the value of the access instruction is “1” , Indicating a method of transmitting an RREQ using a plurality of frames. In the illustrated example, the number of RAs in the priority class 1 is “2”, and the access instruction is “0”. Other rows are as illustrated.
- the order of description of the priority classes included in the priority RA control information may be the same as the order of arrangement in the actual RA area.
- the wireless terminal 2 receives the RFch, acquires the start position of the RA area and the total number of RAs from the RFch, and further, all of the existing RA areas in front of the class to which the own wireless terminal 2 belongs from the priority RA control information.
- this class information it is possible to specify the start slot (position) of the RA area of the class to which the own wireless terminal 2 belongs.
- the radio terminal 2 belonging to class 2 has 8 slots (the 10th slot from the 3rd slot) to the class 2 of the 3rd slot. It can be seen that this is the RA area of the terminal 2.
- the position and the number of slots can be obtained by adding the information of all priority classes.
- the base station 1 can dynamically change the ratio of the Rch belonging to the priority class and the Rch belonging to the non-priority class in the random access section.
- Step S1101 When the priority class traffic (communication) occurs, the wireless terminal 2 notifies the base station 1 of the occurrence of the traffic of the priority class using the shared slot (the processing of Step S101 to Step S104). Thereafter, the process proceeds to step S1102. Specifically, the wireless terminal 2 acquires shared slot information in the RFch, acquires the position and number of the shared slot, and notifies the occurrence of traffic according to a format defined for the shared slot.
- Step S1102 Based on the information included in the RFch, the wireless terminal 2 acquires the priority RA control information defined for the priority RA to which the own wireless terminal 2 belongs in a frame used for the next transmission. Further, the wireless terminal 2 performs access control according to the access instruction included in the priority RA control information. Thereafter, the process proceeds to step S1103.
- Step S1103 The wireless terminal 2 transmits the RREQ to the corresponding priority RA according to the access control performed in Step S1102. Thereafter, the process ends.
- the wireless terminal 2 transmits an RREQ. Note that the transmission timing of the RREQ transmitted by the wireless terminal 2 at this time will be described with reference to FIG.
- FIG. 12 is a sequence diagram showing RREQ transmission timing in the first embodiment of the present invention.
- a notification is transmitted to the shared slot.
- the wireless terminal 2 acquires shared slot information from the RFch and transmits a notification to the shared slot of the frame #N.
- the base station 1 determines the number of priority RAs and the access method for frame # (N + 1), which is the next frame after frame #N, based on the notification result included in the shared slot of frame #N. In addition, the base station 1 broadcasts to the wireless terminal 2 priority RA control information including the determined priority RA number and access method on the RFch of frame # (N + 1).
- the wireless terminal 2 acquires the priority RA control information included in the RFch of the frame # (N + 1), performs access control of the frame # (N + 1) based on the acquired priority RA control information, and performs the access control of the frame # (N + 1).
- RREQ is transmitted to the priority RA.
- the base station 1 receives a notification that an immediate event has occurred from the wireless terminal 2, and moves the allocation of Rch included in the RA section based on the received notification.
- Rch can be assigned to an immediate event by changing the change to the target.
- the radio terminal 2 can transmit RREQ to the base station 1 using the assigned Rch.
- the wireless terminal 2 transmits a bandwidth request message (RREQ) that is a message for requesting a bandwidth to be used for a predetermined event such as an event that requires immediacy to the base station 1 with a low delay time. Can do.
- RREQ bandwidth request message
- first specific example and the second specific example are based on the RREQ transmission timing (RREQ transmission sequence) described with reference to FIG.
- the format of the shared slot differs between the first specific example and the second specific example.
- the priority terminal access control is the same in the first specific example and the second specific example.
- the processing flow of the wireless terminal 2 described with reference to FIG. 11 is the same in the first specific example and the second specific example.
- FIG. 13 is a flowchart showing a procedure for determining the number of priority RAs in the base station 1 in this specific example.
- the number of shared slots for the priority class is 1.
- the received frame for receiving the shared slot is assumed to be #N.
- Step S1301 The base station transmission / reception management unit 23 determines whether or not there is an access to the shared slot. If it is determined that the shared slot has been accessed, the process proceeds to step S1302, and otherwise, the process proceeds to step S1307. The determination is performed based on the method shown in steps S201 to S208.
- Step S1302 The base station transmission / reception management unit 23 refers to the priority RA number of the priority class in the previous frame # (N-1), and determines whether or not the priority RA number is zero. If it is determined that the value is 0, the process proceeds to step S1303. Otherwise, the process proceeds to step S1304.
- Step S1303 The base station transmission / reception management unit 23 sets the priority RA number of the priority class in the frame # (N + 1) next to the frame #N to an initial value (specified value). Thereafter, the process ends.
- Step S1304 Since the base station transmission / reception management unit 23 has the allocation of the priority RA number in frame # (N ⁇ 1), the priority RA number in frame # (N + 1) is the priority in frame # (N ⁇ 1). An increase process is performed on the number of RAs to calculate the number of priority RAs in frame # (N + 1). Thereafter, the process proceeds to step S1305.
- the priority RA number of frame # (N + 1) is the priority RA number of frame # (N ⁇ 1) + ⁇ (specified value).
- Step S1305) The base station transmission / reception management unit 23 compares the priority RA number of frame # (N + 1) calculated in step S1304 with the maximum allocation number (specified value) that can be allocated to the priority class in one frame. To do. If it is determined that the number of priority RAs is less than the maximum allocation number, the process ends, otherwise the process proceeds to step S1306.
- Step S1306 The base station transmission / reception management unit 23 changes the priority RA number of frame # (N + 1) to the maximum allocation number that can be allocated to the priority class in one frame. Thereafter, the process ends.
- Step S1307 The base station transmission / reception management unit 23 sets the priority RA number of the priority class in frame # (N + 1) to zero. That is, the RA area is not secured. Thereafter, the process ends.
- the base station 1 can determine the number of priority RAs. When there are a plurality of shared slots for the priority class, the base station 1 executes the processes of steps S1301 to S1307 after all the shared slot reception processes for the priority class. At this time, regarding the presence / absence of access determined in step S1301, it is determined that there is access when there is access in at least one of the plurality of shared slots.
- the base station transmission / reception management unit 23 selects the access method of the wireless terminal 2 of the priority class in # (N + 1) in frame #N.
- Step S1401 The base station transmission / reception management unit 23 determines whether or not the number of priority RAs and the maximum allocation number that can be allocated to the priority class in one frame are the same. If it is determined that they are the same, the process proceeds to step S1402, and otherwise, the process proceeds to step S1403.
- Step S1402 Since the number of preferential RA has reached the maximum allocation number, the base station transmission / reception management unit 23 instructs the wireless terminal 2 to access using a plurality of frames. Therefore, the base station transmission / reception management unit 23 sets the access instruction to “1”. Thereafter, the process proceeds to step S1404. Note that two types of access instructions, one for odd frames and one for even frames, are prepared for each priority class, and the one corresponding to the frame number of frame # (N + 1) is applied.
- Step S1403 Since the priority RA number has not reached the maximum allocation number, the base station transmission / reception management unit 23 instructs the wireless terminal 2 to access using one frame (frame # (N + 1)). Therefore, the base station transmission / reception management unit 23 sets the access instruction to “0”. Thereafter, the process proceeds to step S1404.
- Step S1404 The base station transmission / reception management unit 23 creates priority RA control information, and broadcasts the priority RA control information created in the RFch of frame # (N + 1) to the radio terminal 2. Thereafter, the process ends.
- the base station 1 can transmit the priority RA control information to the wireless terminal 2.
- the wireless terminal 2 in the first specific example transmits an RREQ to the base station 1 when priority class traffic occurs or when retransmission occurs.
- the configuration of the frame transmitted in the shared slot is the same as the configuration of the frame shown in FIG. 5A.
- Step S1501 The wireless terminal 2 acquires shared slot information (number and position of shared slots) for the priority class from the RFch of frame #N. Thereafter, the process proceeds to step S1502.
- Step S1502 The wireless terminal 2 transmits a notification in accordance with the format defined in the shared slot indicated by the shared slot information acquired in Step S1501. Thereafter, the process proceeds to step S1503.
- Step S1503 The wireless terminal 2 receives the priority RA control information from the RFch of frame # (N + 1), and obtains an access instruction for the priority class and the number of priority RAs. Thereafter, the process proceeds to step S1504.
- Step S1504 When the access instruction is “0”, the wireless terminal 2 is an instruction to transmit an RREQ using this frame. Therefore, the priority RA number is set to the IBW (Initial Back Off Window) size and the priority RA number is set. The back off number is determined so that the back off number is uniform. In addition, when the access instruction is “1”, the wireless terminal 2 is an instruction to transmit an RREQ using a plurality of frames after the next frame, so the IBW size is increased and the IBW size is updated. To do. If the access instruction is “1” and Back off is activated, a notification is transmitted to the shared slot in order to notify the base station that there is traffic to the priority RA. Thereafter, the process proceeds to step S1505.
- IBW Initial Back Off Window
- any increase control such as exponent increase, power increase, logarithmic increase, and linear increase can be applied.
- the initial value of the IBW size is the number of priority RAs (maximum allocation number) at the time of the access instruction “1”
- the back-off window size is IBW ⁇ 2.
- Step S1505 The wireless terminal 2 determines whether or not the Back off number determined in Step S1506 is larger than the priority RA number of frame # (N + 1). If it is determined that the value is larger, the process proceeds to step S1506. Otherwise, the process proceeds to step S1507.
- Step S1506 The wireless terminal 2 transmits an RREQ using the priority RA of frame # (N + 1). Thereafter, the process ends.
- Step S1507 The wireless terminal 2 transmits an RREQ using the priority RA after frame # (N + 2). Thereafter, the process ends.
- the wireless terminal 2 receives the RFch of the next frame after transmitting the RREQ after transmitting the RREQ using the priority RA, and determines whether the transmission is successful based on the information included in the received RFch. To do. If it is determined that the transmission has succeeded, the wireless terminal 2 waits for Dch assignment for data transmission. On the other hand, when determining that it has failed, the wireless terminal 2 re-executes the RREQ, and thus executes the processing of steps S1501 to S1507 again.
- the base station 1 receives a notification that an immediate event has occurred from the wireless terminal 2, and dynamically changes the allocation of the Rch included in the RA section based on the received notification.
- Rch can be assigned to an immediate event.
- the wireless terminal 2 can transmit RREQ to the base station 1 using the assigned Rch.
- the wireless terminal 2 transmits a bandwidth request message (RREQ) that is a message for requesting a bandwidth to be used for a predetermined event such as an event that requires immediacy to the base station 1 with a low delay time. Can do.
- RREQ bandwidth request message
- FIG. 16 is a flowchart showing a procedure for determining the number of preferential RAs in the base station 1 in this specific example.
- the access results for the shared slot are shown as “No access to the shared slot”, “Access from one wireless terminal to the shared slot”, “Access from two or more wireless terminals to the shared slot”
- the process is changed according to the three types of access “Yes”.
- the number of shared slots for the priority class is 1.
- the received frame for receiving the shared slot is assumed to be #N.
- the configuration of the frame transmitted in the shared slot is the same as the configuration of the frame shown in FIG. 5B.
- Step S1601 The base station transmission / reception management unit 23 determines whether or not there is an access to the shared slot. When there is an access to the shared slot, it is determined how many wireless terminals 2 have accessed. If it is determined that there is no access to the shared slot, the process proceeds to step S1602. If it is determined that one wireless terminal 2 has accessed the shared slot, the process advances to step S1603. If it is determined that two or more wireless terminals 2 have accessed the shared slot, the process advances to step S1604. The determination is performed based on the method described in steps S201 to S208.
- Step S1602 The base station transmission / reception management unit 23 sets the priority RA number of the priority class in the frame # (N + 1) next to the frame #N to 0. Thereafter, the process ends.
- Step S1603 The base station transmission / reception management unit 23 sets the priority RA number of the priority class in frame # (N + 1) to 1. Thereafter, the process ends.
- Step S1604 The base station transmission / reception management unit 23 refers to the priority RA number of the priority class in the immediately preceding frame # (N-1) and determines whether or not the priority RA number is zero. If it is determined that the value is 0, the process proceeds to step S1605; otherwise, the process proceeds to step S1606.
- Step S1605 The base station transmission / reception management unit 23 sets the priority RA number of the priority class in the frame # (N + 1) next to the frame #N to an initial value (specified value). Thereafter, the process ends.
- Step S 1606 Since the base station transmission / reception management unit 23 has assigned a priority RA number in frame # (N ⁇ 1), the priority RA number in frame # (N + 1) is given priority in frame # (N ⁇ 1). An increase process is performed on the number of RAs to calculate the number of priority RAs in frame # (N + 1). Thereafter, the process proceeds to step S1607.
- the priority RA number of frame # (N + 1) is the priority RA number of frame # (N ⁇ 1) + ⁇ (specified value).
- Step S1607 The base station transmission / reception management unit 23 compares the priority RA number of frame # (N + 1) calculated in step S1606 with the maximum allocation number (specified value) that can be allocated to the priority class in one frame. To do. If it is determined that the number of priority RAs is less than the maximum allocation number, the process ends, otherwise the process proceeds to step S1608.
- Step S1608 The base station transmission / reception management unit 23 changes the priority RA number of frame # (N + 1) to the maximum allocation number that can be allocated to the priority class in one frame. Thereafter, the process ends.
- the procedure for determining the access method for the wireless terminal 2 in the base station 1 and the procedure for transmitting the RREQ to the base station 1 by the wireless terminal 2 are the same as those in the first specific example.
- the base station 1 receives a notification that an immediate event has occurred from the wireless terminal 2, and dynamically changes the allocation of the Rch included in the RA section based on the received notification.
- Rch can be assigned to an immediate event.
- the number of priority RAs can be determined according to Further, the radio terminal 2 can transmit RREQ to the base station 1 using the assigned Rch.
- the wireless terminal device transmits a bandwidth request message (RREQ), which is a message for requesting a bandwidth to be used for a predetermined event such as an event that requires immediacy, to the base station device with a low delay time.
- RREQ bandwidth request message
- the base station 1 executes the processes of steps S1601 to S1608 after all the shared slot reception processes for the priority class.
- the notification number determination process when it is determined that access is made from two or more wireless terminals 2 in at least one shared slot, the branch to “there is access from two or more wireless terminals to the shared slot” Proceed to step S1604.
- the number of accesses can be specified in other cases, the number of priority RAs is ensured by the specified number of accesses.
- the priority RA area is controlled for each priority class, even when there are a plurality of priority classes, it is possible to control each priority class independently.
- the wireless terminal 2 since the wireless terminal 2 first transmits a notification to the shared slot and accesses the priority RA in the next frame, at the time of retransmission, access to the priority RA is every other frame. . Therefore, by enabling access to the priority RA every frame, the following method can be used to reduce the access time to the priority RA. Specifically, the wireless terminal 2 transmits a notification to the shared slot in two consecutive frames (frames #N and # (N + 1)) at the start of transmission. The wireless terminal 2 transmits RREQ in the priority RA of frame # (N + 1).
- FIG. 17 is a simulation result showing a relationship between traffic and priority class transmission delay time when the wireless communication system according to the first embodiment of the present invention is used.
- the horizontal axis indicates traffic
- the vertical axis indicates transmission delay time (seconds) of the priority class wireless terminal 2.
- a graph g21 shows characteristics when the priority traffic is 0.01 when the wireless communication system according to the first embodiment of the present invention is used.
- the graph g22 shows the characteristics when the priority traffic is 0.05 when the wireless communication system according to the first embodiment of the present invention is used.
- the graph g11 shows the characteristics when the priority traffic is 0.01 when the wireless communication system according to the conventional technique is used.
- the graph g12 shows the characteristics when the priority traffic is 0.05 when the wireless communication system according to the prior art is used.
- the delay time of the priority class radio terminal 2 was evaluated in the case where there were two types of radio terminals 2 of the priority class and the non-priority class.
- the delay time is the time from when data is generated at the wireless terminal 2 until the data is received at the base station 1.
- the traffic is normalized by the transmission capacity (9600 bps), and the non-priority class wireless terminal 2 is compared to the traffic model having two kinds of priority class wireless terminals 2 of 0.01 and 0.05.
- the traffic is fluctuating.
- the generation of data in the wireless terminal 2 follows a Poisson distribution (average 360 seconds), and the data length is 320 bits.
- the IBW is set to 8 for the priority class wireless terminal and to 32 for the non-priority class wireless terminal.
- the transmission rate is 9600 bps, and the length of one frame is 1 second.
- the wireless communication system according to the second embodiment includes a base station 1 and a wireless terminal 2 as in the first embodiment. Description of the second embodiment that is the same as the first embodiment will be omitted.
- FIG. 18 is a configuration diagram showing a MAC frame configuration including a shared access slot in the second embodiment of the present invention.
- the configuration of the MAC frame according to the second embodiment (FIG. 18) is substantially the same as the configuration of the MAC frame according to the first embodiment (FIG. 4).
- the MAC frame has one shared slot
- the MAC frame has two shared slots (the first shared slot CS1, the second shared slot). In that it has a common slot CS2).
- the present invention is not limited to this, and the MAC frame has three or more shared slots. Also good.
- the terminal transmission / reception management unit 23 acquires the shared slot information based on the data that the terminal transmission / reception unit 21 receives from the base station 1. Subsequently, the terminal transmission / reception management unit 23 notifies the terminal shared slot management unit 24 of the shared slot information. Based on the shared slot information, the terminal shared slot management unit 24 specifies the start positions of two shared slots (shared slots CS1 and CS2 in FIG. 18) corresponding to the immediate event, and notifies the terminal transmission / reception management unit 23 of them. .
- the terminal transmission / reception management unit 23 notifies the terminal transmission / reception control unit 25 of the start positions of the two shared slots.
- the terminal transmission / reception control unit 25 calculates the transmission timing of data for notifying that an immediate event has occurred from the start position of the shared slot corresponding to the transmission history.
- the shared slot CS1 see FIG. 18
- the retransmission shared slot CS2 see FIG. 18 is used.
- the notification of the immediate event is newly notified from the wireless terminal 2 based on whether the notification of the immediate event from the wireless terminal 2 is transmitted using the shared slot CS1 or the shared slot CS2. It is possible to identify whether the notification has been sent or not. That is, the base station 1 can identify the transmission history of the wireless terminal 2.
- the shared slot CS1 is used for new notification
- the next slot, the shared slot CS2 is used for retransmission.
- the shared slot CS2 may be used for new notification
- the shared slot CS1 may be used for retransmission.
- the terminal transmission / reception management unit 23 notifies the terminal frame generation / decomposition unit 22 of the type of immediate event.
- the terminal frame generation / decomposition unit 22 generates a PDU from the type of immediate event and notifies the terminal transmission / reception unit 21 of the PDU. Subsequently, the terminal transmission / reception unit 21 transmits the PDU to the base station 1 at a timing indicated by the terminal transmission / reception control unit 25 and ends the process.
- reception processes for the two shared slots CS1 and CS2 are performed.
- the base station 1 performs the processing of FIG. 8 described in the first embodiment for the new notification shared slot CS1.
- “determination as event notification” is performed in step S206 of FIG. 8, but in the second embodiment, “determination is made as new notification of event” in step S206 of FIG.
- the base station 1 performs the processing of FIG. 8 described in the first embodiment for the retransmission shared slot CS2.
- “determination as event notification” is performed in step S206 of FIG. 8, but in the second embodiment, “determination is determined as event retransmission notification” in step S206 of FIG.
- FIG. 19 is a flowchart showing a procedure for determining the number of preferential RAs in the base station 1 in the second embodiment of the present invention.
- the base station 1 determines the number of preferential RAs for the next frame # N + 1 when the shared slot is received in frame #N.
- the priority number assigned to the frame # N + 1 is the priority assigned to the frame # N-1.
- the number is increased from the number of RA (step S1205).
- the base station 1 determines whether or not the number of priority RAs of frame # N + 1 is smaller than the maximum allocation number (step S1206).
- the maximum number of allocations is the maximum number of RAs that can be allocated to frame # N + 1. If the priority RA number is smaller than the maximum allocation number in step S1206, the process of the flowchart in FIG. On the other hand, if the number of priority RAs is greater than or equal to the maximum allocation number in step S1206, the base station 1 allocates a priority RA number equal to the maximum allocation number to frame # N + 1 (step S1207).
- step S1202 if the base station 1 does not detect a retransmission notification in step S1201 and does not detect a new notification (step S1202), the number of priority RAs assigned to frame # N + 1 is set to 0 (step S1203). ). That is, the base station 1 does not assign a priority RA to frame # N + 1.
- step S1204 when a new notification is detected in step S1202, the base station 1 assigns a priority RA number equal to a predetermined initial value to frame # N + 1 (step S1204).
- step S1204 of FIG. 19 demonstrated the case where the base station 1 allocated the priority RA number equal to a predetermined initial value to frame # N + 1, it is not limited to such a process.
- the base station 1 may determine whether or not the priority RA has been allocated in the frame # N ⁇ 1 received from the wireless terminal 2 last time. If the priority RA is assigned in frame # N-1, the number of RAs equal to the number of RAs assigned to frame # N-1 may be assigned to frame # N + 1. Further, when the priority RA is not assigned in frame # N ⁇ 1, the base station 1 may assign a priority RA number equal to a predetermined initial value to frame # N + 1.
- FIG. 20 is a simulation result showing the relationship between the traffic of the non-priority class wireless terminal 2 and the delay time of the priority class wireless terminal 2 when the second embodiment of the present invention is used.
- the horizontal axis indicates the traffic of the non-priority class wireless terminal 2
- the vertical axis indicates the delay time (seconds) of the priority class wireless terminal 2.
- a graph g31 shows characteristics when the wireless communication system according to the second embodiment of the present invention is used.
- a graph g41 shows characteristics when a wireless communication system according to the prior art is used.
- the delay time of the priority class wireless terminal 2 is evaluated in the case where there are two types of the priority class wireless terminal 2 and the non-priority class wireless terminal 2.
- the delay time is the time from when data is generated at the wireless terminal 2 until the data is received at the base station 1.
- the delay time of the priority class wireless terminal 2 is defined as 10 seconds. Further, regarding the wireless terminal 2 of the non-priority class, it is assumed that there is no regulation of the delay time.
- the traffic is fixed (0.2) in the priority class wireless terminal 2, and the traffic of the non-priority class wireless terminal 2 is varied.
- data generation follows a Poisson distribution (average: 333.3 seconds), and the data length is 320 bits.
- the traffic is normalized with a transmission capacity of 9600 bits.
- the IBW is set to 8 for the wireless terminal 2 of the priority class and 1024 for the wireless terminal 2 of the non-priority class.
- the transmission rate is 9600 bps and the length of one frame is 1 second.
- the delay time of the priority class wireless terminal increases due to an increase in traffic of the non-priority class wireless terminal, and the transmission quality of the priority class wireless terminal Can not be guaranteed.
- the delay time of the priority class radio terminal 2 is constant regardless of the traffic of the radio terminal 2 of the non-priority class, and the radio of the priority class The transmission quality of the terminal 2 can be guaranteed.
- the present invention relates to a wireless communication method, a base station device, and a wireless communication method in which a wireless terminal device transmits a bandwidth request message used for a predetermined event such as an event that requires immediacy to a base station device with low delay time It can be applied to communication systems.
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Abstract
Description
本願は、2008年2月27日に、日本に出願された特願2008-046016号に基づき優先権を主張し、その内容をここに援用する。
5GHz帯アドバンスドワイヤレスアクセス(AWA)システムの開発 -MAC/DCL機能- 2000年 電子情報通信学会ソサイエティ大会 B-5-39 pp.327
図1は、本発明の第1の実施形態に係る無線通信システムを示した概略ブロック図である。無線通信システムは、基地局1と、無線端末2-1~2-N(以下、無線端末を代表して記載する場合、無線端末2のように記載する)とを備えている。なお、基地局のことを、基地局装置とも称する。また、無線端末のことを、無線端末装置とも称する。また、基地局1は有線ネットワーク4に接続している。また、有線ネットワーク4にはサーバ3が接続している。また、基地局1は有線ネットワーク4を介してサーバ3と通信を行うことができる。
第一の具体例での優先RA数の決定方法について図13を参照して説明する。図13は本具体例における基地局1での優先RA数の決定手順について示したフローチャートである。なお、本具体例では、優先クラスに対する共用スロット数が1の場合である。また、共用スロットを受信する受信フレームを#Nとする。
(ステップS1507)無線端末2は、フレーム#(N+2)以降の優先RAを使用してRREQを送信する。その後、処理を終了する。
第二の具体例での優先RA数の決定方法について図16を参照して説明する。図16は本具体例における基地局1での優先RA数の決定手順について示したフローチャートである。なお、本具体例では、共用スロットに対するアクセス結果を、「共用スロットにアクセス無し」、「共用スロットに一台の無線端末からのアクセスあり」、「共用スロットに二台以上の無線端末からのアクセスあり」の3種類のアクセスに応じて処理を変更する。
また、本具体例では、優先クラスに対する共用スロット数が1の場合である。また、共用スロットを受信する受信フレームを#Nとする。また、本具体例において、共用スロットで送信するフレームの構成は、図5Bに示したフレームの構成と同様である。
具体的には、無線端末2は、送信開始時に、2フレーム連続(フレーム#Nと#(N+1))で共用スロットヘ通知を送信することとする。無線端末2は、フレーム#(N+1)の優先RAにおいてRREQを送信する。もし、優先RAへのアクセスに失敗した場合(フレーム#(N+2)で検出)でも、前のフレーム#(N+1)で共用スロットヘの通知を送信しているため、フレーム#(N十2)において優先RAの割り当てが存在し、当該優先RAへのRREQの再送が可能である。但し、フレーム#(N+2)においては、優先RAへのアクセスが失敗しているので、RREQの再送用に本フレームの共用スロットヘの通知を送信することになる。
また、グラフg11は、従来技術による無線通信システムを用いた場合において、優先トラヒックが0.01の場合の特性を示している。また、グラフg12は、従来技術による無線通信システムを用いた場合において、優先トラヒックが0.05の場合の特性を示している。
ここで、トラヒックは、伝送容量(9600bps)で正規化されており、0.01と0.05の2種類の優先クラスの無線端末2を有するトラヒックモデルに対して、非優先クラスの無線端末2のトラヒックを変動させている。なお、無線端末2でのデータの発生は、ポアソン分布(平均360秒)に従い、データ長は320bitsである。
従来技術による無線通信システムでは、IBWを、優先クラスの無線端末で8とし、非優先クラスの無線端末で32としている。また、他のパラメータとして、伝送速度を9600bpsとし、1フレーム長を1秒としている。
これに対して、本発明の第1の実施形態による無線通信システムでは、図17のグラフg21及びg22に示すように、トラヒックの変動に依らず、常に一定の遅延時間(4秒以下)を維持しており、低遅延時間での伝送を実現することができる。
次に、本発明の第2の実施形態による無線通信システムついて説明する。第2の実施形態による無線通信システムは、第1の実施形態と同様に、基地局1と無線端末2を備えている。第2の実施形態が、第1の実施形態と同様である点に関しては、その説明を省略する。
送受信を行うMACフレームと同期済みの無線端末2において、端末送受信管理部23は、端末送受信部21が基地局1から受信したデータに基づいて共用スロット情報を取得する。続いて、端末送受信管理部23は、共用スロット情報を端末共用スロット管理部24に通知する。端末共用スロット管理部24は、共用スロット情報に基づいて、即時イベントに対応した2つの共用スロット(図18の共用スロットCS1、CS2)の開始位置をそれぞれ特定し、端末送受信管理部23に通知する。
図18において、新規通知用として共用スロットCS1を用いる場合、再送用として次のスロットである共用スロットCS2を用いる。なお、新規通知用として共用スロットCS2を用い、再送用として共用スロットCS1を用いるようにしても良い。
基地局1は、新規通知用の共用スロットCS1に対しては、第1の実施形態で説明した図8の処理を行う。ただし、第1の実施形態では、図8のステップS206で「イベント通知と判定」していたが、第2の実施形態では、図8のステップS206で「イベントの新規通知と判定」する。
また、第1の実施形態では、図8のステップS208で「イベント未通知と判定」していたが、第2の実施形態では、図8のステップS208で「イベントの新規通知なしと判定」する。
また、第1の実施形態では、図8のステップS208で「イベント未通知と判定」していたが、第2の実施形態では、図8のステップS208で「イベントの再送通知なしと判定」する。
始めに、基地局1は、受信処理において、新規通知の有無に関わらず、再送通知を検出した場合(ステップS1201)、フレーム#N+1に割り当てる優先RA数を、フレーム#N-1に割り当てた優先RA数よりも増加させる(ステップS1205)。
ステップS1206において、優先RA数が、最大割当数よりも小さい場合には、図19のフローチャートの処理を終了する。一方、ステップS1206において、優先RA数が、最大割当数以上である場合には、基地局1は、フレーム#N+1に最大割当数に等しい優先RA数を割り当てる(ステップS1207)。
一方、ステップS1202で新規通知を検出した場合、基地局1は、フレーム#N+1に、予め定められた初期値に等しい優先RA数を割り当てる(ステップS1204)。
例えば、基地局1が無線端末2から前回受信したフレーム#N-1で、優先RAを割り当てていたか否かを基地局1が判定するようにしても良い。そして、フレーム#N-1で優先RAを割り当てていた場合には、フレーム#N-1に割り当てていたRA数に等しいRA数を、フレーム#N+1に割り当てるようにしても良い。また、フレーム#N-1で優先RAを割り当てていなかった場合には、基地局1は、フレーム#N+1に、予め定められた初期値に等しい優先RA数を割り当てるようにしても良い。
また、グラフg41は、従来技術による無線通信システムを用いた場合の特性を示している。
このシミュレーションでは、優先クラスの無線端末2の遅延時間を10秒と規定している。また、非優先クラスの無線端末2に関しては、遅延時間の規定はないものとしている。
なお、このトラヒックモデルにおいて、データ発生はポアソン分布(平均:333.3秒)に従い、データ長は320bitsである。そして、トラヒックは、伝送容量が9600bitsで正規化されている。
従来技術による無線通信システムでは、IBWを、優先クラスの無線端末2で8とし、非優先クラスの無線端末2で1024としている。他のパラメータとして、伝送速度を9600bpsとし、1フレーム長を1秒としている。
これに対して、本発明の第2の実施形態による無線通信システムでは、非優先クラスの無線端末2のトラヒックに依らず、優先クラスの無線端末2の遅延時間は一定であり、優先クラスの無線端末2の伝送品質を保証することができる。
Claims (11)
- 複数の無線端末装置が共通の無線回線により基地局装置と接続され、前記基地局装置は、無線フレーム内の上り通信用帯域のうち帯域割り当て済みの区間をデマンドアサイン区間、残りの区間をランダムアクセス区間として管理し、前記無線端末装置からの帯域要求情報に対して要求分の上り通信用帯域を割り当て、前記無線端末装置は、送信するデータが発生した場合、前記帯域要求情報を前記ランダムアクセス区間内のランダムスロットに送信し、送信に成功した場合には前記基地局装置から割り当てられた帯域を用いて前記データを送信する無線通信方法において、
前記無線フレームはさらに所定のイベントの発生通知情報を送信するための共用スロットを備え、
前記無線端末装置が前記共用スロットを使用し、前記無線端末装置で前記所定のイベントが発生したことを知らせる情報を前記基地局装置に送信するイベント発生送信ステップと、
前記基地局装置が、前記イベント発生送信ステップで送信された前記所定のイベントの発生に基づいて、前記ランダムアクセス区間内のランダムスロットのうち、前記所定のイベントに基づいた前記帯域要求情報を送信するためのランダムスロットとして割り当てるランダムスロットの数を決定するランダムスロット割当ステップと、
前記割り当てたランダムスロットの情報を、前記基地局装置が前記無線端末装置に送信する割当情報送信ステップと、
前記割当情報送信ステップにより送信された前記割り当てたランダムスロットの情報に基づいて、前記無線端末装置は、前記ランダムスロット割当ステップで割り当てられた前記ランダムスロットを使用し、前記基地局装置に対して前記帯域要求情報を送信する帯域要求ステップと、
を備える無線通信方法。 - 前記基地局装置は、前記ランダムスロット割当ステップにおいて、
前記イベント発生送信ステップで所定のイベントが発生したことを通知された場合には、前記無線端末装置に割り当てるランダムスロットの数を変化させる請求項1に記載の無線通信方法。 - 前記基地局装置は、前記ランダムスロット割当ステップにおいて、
前記イベント発生送信ステップで前記無線端末装置から送信された前記所定のイベントが発生したことを知らせる情報が、再送されたものであるか否かに基づいて、前記無線端末装置にランダムスロットとして割り当てるランダムスロットの数を変化させる請求項1に記載の無線通信方法。 - 前記共用スロットは、第1の共用スロットと第2の共用スロットを有しており、
前記無線端末装置は、前記イベント発生送信ステップにおいて、
前記所定のイベントが発生したことを知らせる情報が、前記基地局装置への再送ではない場合には前記第1の共用スロットを用いて送信し、
前記所定のイベントが発生したことを知らせる情報が、前記基地局装置への再送である場合には前記第2のスロットを用いて送信する請求項3に記載の無線通信方法。 - 複数の無線端末装置を共通の無線回線により接続し、無線フレーム内の上り通信用帯域のうち帯域割り当て済みの区間をデマンドアサイン区間、残りの区間をランダムアクセス区間として管理し、前記無線端末装置からの帯域要求情報に対して要求分の上り通信用帯域を割り当てる基地局装置であって、
前記無線フレームはさらに所定のイベントの発生通知情報を送信するための共用スロットを備え、
前記無線端末装置から前記共用スロットを使用して送信され、前記無線端末装置で前記所定のイベントが発生したことを知らせる情報を受信する基地局受信部と、
前記基地局受信部が受信した前記所定のイベントの発生に基づいて、前記ランダムアクセス区間内のランダムスロットのうち、前記所定のイベントに基づいた前記帯域要求情報を送信するためのランダムスロットとして割り当てるランダムスロットの数を決定する基地局送受信管理部と、
前記割り当てたランダムスロットの情報を、前記基地局装置が前記無線端末装置に送信する基地局送信部と、
を備える基地局装置。 - 前記基地局送受信管理部は、
所定のイベントが発生したことを前記無線端末装置から前記基地局受信部が受信した場合には、前記無線端末装置に割り当てるランダムスロットの数を変化させる請求項5に記載の基地局装置。 - 前記基地局送受信管理部は、
前記無線端末装置から送信され、前記基地局受信部が受信した前記所定のイベントが発生したことを知らせる情報が、再送されたものであるか否かに基づいて、前記無線端末装置にランダムスロットとして割り当てるランダムスロットの数を変化させる請求項5に記載の基地局装置。 - 複数の無線端末装置が共通の無線回線により基地局装置と接続され、前記基地局装置は、無線フレーム内の上り通信用帯域のうち帯域割り当て済みの区間をデマンドアサイン区間、残りの区間をランダムアクセス区間として管理し、前記無線端末装置からの帯域要求情報に対して要求分の上り通信用帯域を割り当て、前記無線端末装置は、送信するデータが発生した場合、前記帯域要求情報を前記ランダムアクセス区間内のランダムスロットに送信し、送信に成功した場合には前記基地局装置から割り当てられた帯域を用いて前記データを送信する無線通信システムにおいて、
前記無線フレームはさらに所定のイベントの発生通知情報を送信するための共用スロットを備え、
前記無線端末装置は、
前記共用スロットを使用し、前記無線端末装置で前記所定のイベントが発生したことを知らせる情報を前記基地局装置に送信するイベント発生通知部と、
前記基地局装置から送信されるランダムスロットの割り当て情報に基づいて、ランダムスロットを使用し、前記基地局装置に対して前記帯域要求情報を送信する帯域要求部とを備え、
前記基地局装置は、
前記無線端末装置から前記共用スロットを使用して送信され、前記無線端末装置で前記所定のイベントが発生したことを知らせる情報を受信する基地局受信部と、
前記基地局受信部が受信した前記所定のイベントの発生に基づいて、前記ランダムアクセス区間内のランダムスロットのうち、前記所定のイベントに基づいた前記帯域要求情報を送信するためのランダムスロットとして割り当てるランダムスロットの数を決定する基地局送受信管理部と、
前記割り当てたランダムスロットの情報を、前記基地局装置が前記無線端末装置に送信する基地局送信部と、
を備える無線通信システム。 - 前記基地局送受信管理部は、
所定のイベントが発生したことを前記無線端末装置から前記基地局受信部が受信した場合には、前記無線端末装置に割り当てるランダムスロットの数を変化させる請求項8に記載の無線通信システム。 - 前記基地局送受信管理部は、
前記無線端末装置から送信され、前記基地局受信部が受信した前記所定のイベントが発生したことを知らせる情報が、再送されたものであるか否かに基づいて、前記無線端末装置にランダムスロットとして割り当てるランダムスロットの数を変化させる請求項8に記載の無線通信システム。 - 前記共用スロットは、第1の共用スロットと第2の共用スロットを有しており、
前記イベント発生通知部は、
前記所定のイベントが発生したことを知らせる情報が、前記基地局装置への再送ではない場合には前記第1の共用スロットを用いて送信し、
前記所定のイベントが発生したことを知らせる情報が、前記基地局装置への再送である場合には前記第2のスロットを用いて送信する請求項10に記載の無線通信システム。
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