WO2021149121A1 - 無線通信装置、無線通信システム及び無線通信方法 - Google Patents

無線通信装置、無線通信システム及び無線通信方法 Download PDF

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Publication number
WO2021149121A1
WO2021149121A1 PCT/JP2020/001786 JP2020001786W WO2021149121A1 WO 2021149121 A1 WO2021149121 A1 WO 2021149121A1 JP 2020001786 W JP2020001786 W JP 2020001786W WO 2021149121 A1 WO2021149121 A1 WO 2021149121A1
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Prior art keywords
wireless communication
data
communication device
zone
unit
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PCT/JP2020/001786
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English (en)
French (fr)
Japanese (ja)
Inventor
ジヤンミン ウー
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to JP2021572141A priority Critical patent/JP7347545B2/ja
Priority to PCT/JP2020/001786 priority patent/WO2021149121A1/ja
Priority to CN202080093211.8A priority patent/CN114982322A/zh
Publication of WO2021149121A1 publication Critical patent/WO2021149121A1/ja
Priority to US17/861,600 priority patent/US12047176B2/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to a wireless communication device, a wireless communication system, and a wireless communication method.
  • the traffic of mobile terminals occupies most of the network resources.
  • the traffic used by mobile terminals tends to increase in the future.
  • Non-Patent Documents 13 to 39 technical studies are underway by the 3GPP working group (for example, TSG-RAN WG1, TSG-RAN WG2, etc.), and the first edition of the standard document was issued in December 2017. (Non-Patent Documents 13 to 39).
  • 5G is often classified into eMBB (Enhanced Mobile Broad Band), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication). It is supposed to support the use case of.
  • eMBB Enhanced Mobile Broad Band
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communication
  • NR-V2X New Radio Vehicle to Everything
  • V2V Vehicle to Vehicle
  • V2P Vehicle to Pedestrian
  • V2I Vehicle to Infrastructure
  • V2N Vehicle to Network
  • a control channel (PSCCH: Physical Sidelink Control Channel) and a data channel (PSSCH: Physical Sidelink Shared CHannle) are TDM (Time Division Multiplexing) or FDM (Frequency Division Multiplexing).
  • PSCCH resource is mapped to, for example, SCI (Sidelink Control Information) including information on the modulation method and coding rate of the corresponding PSCCH data.
  • SCI Segment Control Information
  • FDM Frequency Division Multiplexing
  • 3GPP TS 22.186 V16.2.0 (2019-06) 3GPP TS 36.211 V16.0.0 (2019-12) 3GPP TS 36.212 V16.0.0 (2019-12) 3GPP TS 36.213 V16.0.0 (2019-12) 3GPP TS 36.300 V16.0.0 (2019-12) 3GPP TS 36.321 V15.8.0 (2019-12) 3GPP TS 36.322 V15.3.0 (2019-09) 3GPP TS 36.323 V15.5.0 (2019-12) 3GPP TS 36.331 V15.8.0 (2019-12) 3GPP TS 36.413 V16.0.0 (2019-12) 3GPP TS 36.423 V16.0.0 (2019-12) 3GPP TS 36.425 V15.0.0 (2018-06) 3GPP TS 37.340 V16.0.0 (2019-12) 3GPP TS 38.201 V16.0.0 (2019-12) 3GPP TS 38.202 V16.0.0 (2019-12) 3GPP TS 38.211 V16
  • V2X it is considered that a group cast of forming a group of wireless communication devices and transmitting data to each wireless communication device in the group is frequently executed. That is, for example, wireless communication devices owned by automobiles and pedestrians located within a predetermined range form a group, and the traveling direction and behavior of each automobile are shared within the group by group casting. In addition, road infrastructure, automobiles and wireless communication devices owned by pedestrians form a group, and warnings and instructions are notified from the road infrastructure to automobiles and pedestrians in the group by group cast.
  • data may not be transmitted / received correctly between wireless communication devices that are far apart from each other due to propagation loss or the like. That is, depending on the wireless line quality, the group cast data may not be received by some wireless communication devices in the group. Therefore, it is conceivable that the wireless communication device that has received the data transfers the data to another wireless communication device in the group and relays the data.
  • the disclosed technology has been made in view of such a point, and an object thereof is to provide a wireless communication device, a wireless communication system, and a wireless communication method capable of appropriately and efficiently relaying data.
  • the wireless communication device disclosed in the present application is, in one embodiment, a reception control unit that receives a signal transmitted to a plurality of wireless communication devices including its own device and acquires data included in the received signal, and another wireless communication.
  • the device detects a retransmission request that is a retransmission request transmitted by the device using a channel corresponding to the position of the other wireless communication device and requests the retransmission of the data, and the other is based on the channel in which the retransmission request is detected.
  • a detection unit that identifies the position of the wireless communication device, a determination unit that determines whether to relay data to the other wireless communication device according to the distance to the position specified by the detection unit, and the determination. It has a transmission unit that transmits the data acquired by the reception control unit to the other wireless communication device when it is determined by the unit to relay the data.
  • the wireless communication device According to one aspect of the wireless communication device, the wireless communication system, and the wireless communication method disclosed in the present application, there is an effect that data can be relayed appropriately and efficiently.
  • FIG. 1 is a diagram showing a specific example of the wireless communication system according to the first embodiment.
  • FIG. 2 is a diagram showing a specific example of zone division.
  • FIG. 3 is a block diagram showing the configuration of the terminal device according to the first embodiment.
  • FIG. 4 is a sequence diagram showing a wireless communication method according to the first embodiment.
  • FIG. 5 is a diagram showing an example of a group cast.
  • FIG. 6 is a diagram showing an example of feedback.
  • FIG. 7 is a diagram showing an example of data relay.
  • FIG. 8 is a flow chart showing the operation of the terminal device according to the first embodiment.
  • FIG. 9 is a diagram showing a specific example of the relative zone setting according to the second embodiment.
  • FIG. 10 is a diagram showing a specific example of the relay zone table.
  • FIG. 1 is a diagram showing a specific example of the wireless communication system according to the first embodiment.
  • the wireless communication system has terminal devices UEs # 1 to # 7 mounted on a plurality of automobiles.
  • the terminal devices UEs # 1 to # 7 belong to the same group and can wirelessly communicate with each other. That is, for example, when the terminal device # UE3 group casts the data, the data is received by the terminal devices UE # 1, UE # 2, and UEs # 4 to # 7.
  • the terminal device # UE3 transmits control information such as SCI (Sidelink Control Information) through a control channel such as PSCCH (Physical Sidelink Control CHannel), and PSCH (Physical Sidelink Shared CHannel) used for data transmission. ) And other data channel information is notified within the group.
  • the terminal devices UE # 1, UE # 2, and UEs # 4 to # 7 other than the terminal device UE # 3 identify the data channel including the data by receiving and decoding the control information of the control channel. Then, when the terminal device UE # 3 transmits data through the data channel, the terminal devices UE # 1, UE # 2, and UE # 4 to # 7 receive and decode the data in the data channel.
  • the terminal device UE # 7 may fail to decode the data channel even though it succeeds in decoding the control channel and identifies the data channel from the control information.
  • the terminal device UE # 7 which has failed to decode the data channel, transmits a NAK requesting data retransmission. Specifically, the terminal device UE # 7 transmits NAK through a feedback channel such as PSFCH (Physical Sidelink Feedback CHannel). That is, when the control channel such as PSCCH is correctly received but the data channel such as PSCH is not correctly received, the terminal device UE # 7 feeds back NAK. On the other hand, the terminal devices UEs # 1, # 2, and # 4 to # 6 that have correctly received both the control channel and the data channel do not give any feedback.
  • the radio resource used as the feedback channel is defined according to the position of each terminal device UE # 1 to # 7.
  • the place where the wireless communication system shown in FIG. 1 is constructed is divided into zones according to geographical coordinates, for example, as shown in FIG. That is, for example, on a road on which a wireless communication system is constructed, 32 rectangular zones F0 to F31 having a predetermined size are repeatedly arranged. Since the size and position coordinates of these zones are known, the terminal devices UEs # 1 to # 7 are located in which zone the own device is located, for example, by specifying the position coordinates of the own device by GPS (Global Positioning System). It is possible to determine whether to do it.
  • the radio resource used as the feedback channel is defined in association with the zone in which the terminal devices UEs # 1 to # 7 are located.
  • the terminal device UE # 7 transmits the NAK using the feedback channel corresponding to the zone in which the own device is located.
  • the correspondence relationship between the zone and the radio resource used as the feedback channel may be predetermined or may be specified by the control information of the control channel.
  • the terminal devices UEs # 1, # 2, # 4 to # 6 that succeeded in decoding the data channel monitor the feedback channel, and when it detects that NAK has been transmitted from any of the terminal devices, NAK is transmitted. Identify the zone where the original terminal is located. That is, here, the zone in which the terminal device UE # 7 is located is specified from the radio resource of the feedback channel in which NAK is detected. Then, the terminal devices UEs # 1, # 2, # 4 to # 6 that have detected the NAK have the distance between the terminal device UE # 3 and the terminal device UE # 7 that have transmitted the data, and the own device and the terminal device UE #. The difference from the distance between 7 is calculated, and the calculated distance difference is compared with a predetermined threshold value.
  • the predetermined threshold value may be determined in advance in the wireless communication system, or may be specified by the control information of the control channel.
  • the terminal device UEs # 1, # 2, # 4 to # 6 use the received data obtained by decoding the data channel as the retransmission data, and the terminal device UE # Send to 7.
  • the terminal devices # 1, # 2, and # 4 to # 6 that transmit the retransmission data transmit the retransmission data using the same radio resource.
  • the radio resource used for transmitting the retransmission data may be predetermined or may be specified by the control information of the control channel.
  • the terminal devices UEs # 1, # 2, # 4 to # 6 that receive the NAK and the distance difference satisfies a predetermined condition relay the data received from the terminal device UE # 3 and transmit the NAK.
  • the terminal device UE # 7 combines, for example, chase combining the initial transmission data received from the terminal device UE # 3 and the retransmission data received from the terminal devices UEs # 1, # 2, # 4 to # 6. Improve the data decoding result by soft-combining.
  • FIG. 3 is a block diagram showing the configuration of the terminal device 100 having the same configuration as the terminal devices UEs # 1 to # 7.
  • the terminal device 100 includes a wireless communication unit 110, a processor 120, and a memory 130.
  • the wireless communication unit 110 transmits and receives signals to and from other wireless communication devices. Specifically, the wireless communication unit 110 performs a predetermined wireless transmission process on the transmission signal, and wirelessly transmits the transmission signal to another wireless communication device such as a terminal device or a base station device via an antenna. Further, the wireless communication unit 110 wirelessly receives a signal via the antenna and performs a predetermined wireless reception process on the received signal.
  • the processor 120 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), and the like, and controls the entire terminal device 100 in an integrated manner.
  • the processor 120 includes a control information generation unit 121, a transmission data generation unit 122, a transmission control unit 123, a reception control unit 124, a NAK generation unit 125, a reception data buffer unit 126, a NAK detection unit 127, and a distance difference determination. It has a unit 128 and a retransmission data acquisition unit 129.
  • the control information generation unit 121 generates control information such as SCI.
  • the control information generated by the control information generation unit 121 includes position information of the terminal device 100, data coding rate and modulation method information, information for specifying the radio resource of the data channel used for data transmission, and data retransmission. Information that identifies the radio resource used in the above may be included.
  • the position information of the terminal device 100 may be the identification information of the zone in which the terminal device 100 is located, or may be, for example, the position coordinates of the terminal device 100 positioned by GPS.
  • the transmission data generation unit 122 generates transmission data to be group cast to wireless communication devices in the group.
  • the transmission data generated by the transmission data generation unit 122 is the first transmission data to be transmitted for the first time.
  • the transmission control unit 123 encodes and modulates the control information and transmission data, maps them to radio resources, and generates a transmission signal. That is, the transmission control unit 123 maps the control information to the control channel, maps the transmission data to the data channel, and generates a transmission signal. Further, when the NAK is generated by the NAK generation unit 125, the transmission control unit 123 maps the NAK to the feedback channel corresponding to the zone in which the terminal device 100 is located and causes the wireless communication unit 110 to transmit the NAK. Further, when the retransmission data is acquired by the retransmission data acquisition unit 129, the transmission control unit 123 maps the retransmission data to the wireless resource for retransmission and causes the wireless communication unit 110 to transmit the retransmission data.
  • the reception control unit 124 acquires a reception signal from the wireless communication unit 110 and executes reception processing for the reception signal. Specifically, the reception control unit 124 executes demodulation and decoding of the control channel to acquire control information, and demodulates and decodes the data channel according to the control information. If the decoding fails as a result of decoding the data channel, the reception control unit 124 notifies the NAK generation unit 125 to that effect. On the other hand, when the data channel is successfully decoded, the reception control unit 124 outputs the received data obtained by the decoding to the reception data buffer unit 126. Further, when the data channel is successfully decoded, the reception control unit 124 executes demodulation and decoding of the feedback channel corresponding to the time slot of the data channel and corresponding to each zone.
  • the NAK generation unit 125 generates a NAK requesting data retransmission when the reception control unit 124 notifies that the data decoding has failed. Then, the NAK generation unit 125 outputs the generated NAK to the transmission control unit 123.
  • the reception data buffer unit 126 temporarily holds the reception data obtained by decoding by the reception control unit 124. At this time, the reception data buffer unit 126 temporarily holds the reception data obtained by decoding the data channel and the control information obtained by decoding the control channel.
  • the NAK detection unit 127 monitors the feedback channel decoded by the reception control unit 124, and detects the NAK from the decoding result of the feedback channel for each zone. That is, the NAK detection unit 127 detects the NAK from the feedback channel corresponding to the zone in which the other wireless communication device whose data decoding has failed is located. At this time, the NAK detection unit 127 identifies the zone in which the wireless communication device that is the source of the NAK is located. Specifically, the NAK detection unit 127 identifies the zone in which the source of the NAK is located by determining which zone the radio resource in which the NAK is detected is used as the feedback channel.
  • the distance difference determination unit 128 calculates the distance between the wireless communication device of the data transmission source and the zone in which the terminal device of the NAK transmission source is located. That is, the position information of the terminal device of the data transmission source is notified by the control information from the data transmission source, and the zone in which the NAK transmission source is located is specified by the NAK detection unit 127. Therefore, the distance difference determination unit 128 Calculates the distance between the source of the data and the zone in which the source of the NAK is located. Further, the distance difference determination unit 128 calculates the distance between the own device (terminal device 100) and the zone in which the terminal device of the NAK transmission source is located.
  • the distance between the data source or own device (terminal device 100) and the zone is the distance from the data source or own device (terminal device 100) to a predetermined point in the zone. ..
  • the position coordinates of the center point of the zone may be used for calculating the distance
  • the position coordinates of the apex of the zone farthest or closest to the data source or the own device (terminal device 100) may be used for calculating the distance. It may be used.
  • the distance difference determination unit 128 calculates the calculated distance difference, and determines whether or not to relay the data to the terminal device of the NAK transmission source by comparing the calculated distance difference with the predetermined threshold value. Specifically, the distance difference determination unit 128 subtracts the distance between the own device and the zone of the NAK source from the distance between the wireless communication device of the data source and the zone of the NAK source. When the distance difference is equal to or greater than a predetermined threshold, it is determined that the data is relayed. On the other hand, the distance difference determination unit 128 determines that the data is not relayed when the calculated distance difference is less than a predetermined threshold value.
  • the retransmission data acquisition unit 129 acquires the retransmission data from the reception data buffer unit 126. Specifically, the retransmission data acquisition unit 129 acquires the reception data and control information held in the reception data buffer unit 126 as retransmission data. Then, the retransmission data acquisition unit 129 outputs the acquired retransmission data to the transmission control unit 123. If the control information acquired from the received data buffer unit 126 includes an index indicating the initial transmission and retransmission of data, the retransmission data acquisition unit 129 changes this index to one indicating retransmission. , Received data and control information are used as retransmission data.
  • the radio resource for retransmission used for transmitting the retransmission data may be predetermined or may be specified by the control information.
  • the memory 130 includes, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory), and stores information used for processing by the processor 120.
  • a RAM Random Access Memory
  • ROM Read Only Memory
  • UE # 3 group casts control information according to the control channel (step S101). That is, the control information generated by the control information generation unit 121 of UE # 3 is transmitted to UEs # 1, # 2, and # 4 to # 7.
  • the control information includes the position information of UE # 3 and the information for identifying the radio resource of the data channel used for transmitting the data.
  • UEs # 1, # 2, and # 4 to # 7 perform reception processing on the data channel according to the control information.
  • UE # 3 group casts the transmitted data by the data channel (step S102). That is, the transmission data generated by the transmission data generation unit 122 of UE # 3 is transmitted to UEs # 1, # 2, and # 4 to # 7.
  • the control channel is transmitted with higher reliability than the data channel, the control information is correctly decoded by UEs # 1, # 2, # 4 to # 7 in the group.
  • the transmission data is correctly decoded by UEs # 1, # 2, and # 4 to # 6 in the group, but is not correctly decoded by UE # 7. That is, for example, as shown in FIG. 5, since UE # 7 is located relatively far from UE # 3 and the wireless environment is poor, the transmission data transmitted from UE # 3 fails to be received by UE # 7. And.
  • UE # 3 is located in the zone F10, and the other UEs # 1, # 2, and # 4 to # 7 are also located in the zone shown in FIG. UE # 3 notifies its own position information by the control information, and this position information may be the identification information of the zone F10, or may be the position coordinates of UE # 3 positioned by GPS, for example. good.
  • UEs # 1, # 2, and # 4 to # 7 can grasp the position of UE # 3 which is the source of data.
  • step S101 the transmission of control information (step S101) and the transmission of transmission data (step S102) are shown separately, but the control information and transmission data are simultaneously transmitted using different radio resources. You may.
  • UE # 7 which failed to receive the data, transmits a NAK requesting data retransmission via the feedback channel (step S103).
  • UE # 7 identifies the zone in which it is located, for example, by positioning with GPS, and transmits NAK using the feedback channel corresponding to the zone. That is, the radio resource used as the feedback channel is different for each zone, and UE # 7 transmits NAK using the radio resource corresponding to the zone in which it is located.
  • UEs # 1, # 2, and # 4 to # 6 that have succeeded in receiving data monitor the feedback channels corresponding to each zone without transmitting an ACK indicating that the data has been successfully received. .. That is, UEs # 1, # 2, and # 4 to # 6 execute reception processing for the feedback channel for each zone without executing transmission processing using the feedback channel. Therefore, UEs # 1, # 2, and # 4 to # 6 receive the NAK in the feedback channel corresponding to the zone in which the UE # 7 is located. That is, for example, as shown in FIG. 6, the NAK detection unit 127 of UEs # 1, # 2, and # 4 to # 6 detects the NAK from the feedback channel corresponding to the zone F14 in which the UE # 7 is located. In addition, the NAK detection unit 127 of UE # 3, which is the data transmission source, also detects the NAK.
  • each UE # 1 to # 7 has half-duplex communication. Even when performing the above, UEs # 1 to # 6 can perform reception processing on the feedback channel and monitor the presence or absence of NAK.
  • the distance difference determination unit 128 of No. 6 executes the determination of the distance difference (step S104). Specifically, the distance between UE # 3 which is the source of data and UE # 7 which is the source of NAK is located in the zone F14 (hereinafter referred to as “transmission / reception distance”), and UE # 1 is calculated. , # 2, # 4 to # 6 and the distance between the zone F14 where the UE # 7 is located (hereinafter referred to as "relay candidate distance”) is calculated. Then, it is determined that the data is relayed in UEs # 1, # 2, and # 4 to # 6 in which the distance difference obtained by subtracting the relay candidate distance from the transmission / reception distance is equal to or greater than a predetermined threshold value.
  • the predetermined threshold value to be compared with the distance difference is a real number.
  • UEs # 1, # 2, and # 4 to # 6 whose relay candidate distance is smaller than the transmission / reception distance relay the data. That is, when the predetermined threshold value is a positive real number, the terminal device that relays the data can be limited to the terminal device that is closer to the zone F14 than the data transmission source UE # 3. Further, when the predetermined threshold value is a negative real number, UEs # 1, # 2, and # 4 to # 6 having a relay candidate distance larger than the transmission / reception distance also relay the data. That is, when the predetermined threshold value is a negative real number, there is a possibility that the terminal device farther from the zone F14 than the data transmission source UE # 3 relays the data.
  • the distance difference determination units 128 of UEs # 1, # 2, and # 4 to # 6 determine that the data is not relayed.
  • the distance difference determination unit 128 of UEs # 4 to # 6 determines that the data is relayed. That is, UEs # 1 and # 2 located farther from zone F14 than UE # 3 do not relay data, and UEs # 4 to # 6 located closer to zone F14 than UE # 3 relay data. Will be done.
  • UEs # 4 to # 6 transmit the data received from UE # 3 and decoded to UE # 7 (step S106). That is, the data and control information held in the reception data buffer units 126 of UEs # 4 to # 6 are used as retransmission data, and the retransmission data is transmitted to UE # 7, which is the transmission source of NAK. Specifically, for example, as shown in FIG. 7, UEs # 4 to # 6 simultaneously transmit retransmission data to UE # 7 using the radio resources for retransmission notified by the control information.
  • NAK detection unit 127 of UE # 3 since the NAK detection unit 127 of UE # 3 also detects NAK from UE # 7, UE # 3, which is the data transmission source, retransmits the data requested to be retransmitted using the same radio resource for retransmission. It may be done (step S105).
  • UE # 7 can further improve the decoding accuracy by softly synthesizing the initial transmission data and the retransmission data for which decoding has failed.
  • the UE # 7 transmits the retransmission data.
  • Data from UE # 3 will be relayed by a terminal device that is relatively close to the zone F14 where it is located. Therefore, the terminal device in the wireless environment capable of relaying the data to the UE # 7 can adaptively relay the data from the UE # 3, and the data can be relayed appropriately and efficiently.
  • the terminal devices that relay data are limited by the condition of the distance difference, it is possible to prevent the number of terminal devices that relay data from becoming excessive, and increase interference and increase in-band radiation due to transmission of retransmission data. Can be suppressed. Further, it is possible to prevent the number of terminal devices for relaying data from becoming excessive based on the positional relationship of the terminal devices.
  • the control channel is demodulated and decoded by the reception control unit 124 to acquire the control information (step S201).
  • the control information includes location information of the wireless communication device that is the source of the signal, information that identifies wireless resources used as various channels, and the like. Therefore, the received data is acquired by demodulating and decoding the data channel by the reception control unit 124 (step S202).
  • the reception control unit 124 determines whether or not the data channel decoding is successful (step S203), and if the decoding fails (step S203No), the NAK generation unit 125 generates NAK (step S203).
  • the NAK is transmitted via the transmission control unit 123 and the wireless communication unit 110 using the feedback channel corresponding to the zone in which the terminal device 100 is located (step S211).
  • step S203 if the data channel is successfully decoded (step S203Yes), the received data is held by the received data buffer unit 126 (step S204). At this time, the control information corresponding to the received data is also held by the received data buffer unit 126. After that, the feedback channel for each zone is monitored by the NAK detection unit 127 (step S205), and if NAK is not detected from the feedback channel corresponding to any zone (step S205No), the received data is processed without being relayed. Is finished.
  • the zone in which the wireless communication device of the source of NAK is located is specified. That is, the NAK detection unit 127 determines which zone the radio resource in which the NAK is detected is the feedback channel, and identifies the zone in which the source of the NAK is located. Then, the distance difference determination unit 128 determines the distance between transmission and reception between the data transmission source and the zone where the NAK transmission source is located, and the relay candidate distance between the terminal device 100 and the zone where the NAK transmission source is located. The distance difference from and is calculated (step S206).
  • the distance difference determination unit 128 compares the distance difference obtained by subtracting the relay candidate distance from the transmission / reception distance with the predetermined threshold value (step S207), and if the distance difference is less than the predetermined threshold value (step S207 No.). ), The process ends without the received data being relayed.
  • the retransmission data acquisition unit 129 acquires the reception data and the control information from the reception data buffer unit 126 as retransmission data (step S208), and the retransmission data is the retransmission data. It is transmitted via the transmission control unit 123 and the wireless communication unit 110 (step S209). That is, when NAK is detected by the NAK detection unit 127 and the distance from the terminal device 100 to the NAK transmission source satisfies the condition, the reception data held in the reception data buffer unit 126 is relayed.
  • the terminal device whose distance difference satisfies a predetermined condition relays the received data, so that the source of NAK that fails to decode the data receives the retransmission data and receives the data. Decoding accuracy can be improved. Further, since the terminal device relatively close to the source of NAK transmits the retransmission data, the data can be relayed efficiently, and the increase of interference and the increase of in-band radiation due to the retransmission data can be suppressed. ..
  • the terminal device that fails to decode the group cast data transmits NAK using the feedback channel corresponding to the zone in which the own device is located. Then, when the terminal device that succeeds in decoding the data detects NAK in the feedback channel for each zone, the distance difference between the distance from the data source to the NAK source and the distance from the own device to the NAK source. When the predetermined condition is satisfied, the decoded received data is transmitted as retransmission data. Therefore, the terminal device satisfying the condition of the distance from the NAK source within the range in which the NAK can be received from the NAK source relays the received data. As a result, an appropriate number of terminal devices in a wireless environment capable of relaying data can adaptively relay data, and data can be relayed appropriately and efficiently.
  • the feature of the second embodiment is that a relative zone is set with reference to the data source, and the feedback channel is selected and the distance is calculated using the set relative zone.
  • a relative zone is set with reference to the terminal device. That is, when the control information including the position information of the data transmission source is transmitted, the terminal device that receives the control information sets a relative zone as shown in FIG. 9, for example, based on the position information of the data transmission source. do.
  • each terminal device can set the relative zones F1 to F24 from the notified position information.
  • the position information of the data transmission source may be the position coordinates determined by GPS, or may be the zone identification information according to the geographical coordinates used in the first embodiment.
  • the transmission control unit 123 uses its own device (terminal device 100) from the position of the data transmission source and the position of the own device (terminal device 100). ) Is located in the relative zone, NAK is mapped to the feedback channel corresponding to this relative zone, and the wireless communication unit 110 transmits the data.
  • the correspondence between the relative zone and the radio resource used as the feedback channel may be predetermined or may be specified by the control information of the control channel.
  • the NAK detection unit 127 monitors the feedback channel decoded by the reception control unit 124, and detects the NAK from the decoding result of the feedback channel for each relative zone. Then, the NAK detection unit 127 identifies the relative zone in which the wireless communication device that is the source of the NAK is located. Specifically, the NAK detection unit 127 identifies the relative zone in which the source of the NAK is located by determining which relative zone the radio resource in which the NAK is detected is used as the feedback channel. do.
  • the distance difference determination unit 128 calculates the distance between the data source and the relative zone where the NAK source is located. Further, the distance difference determination unit 128 calculates the distance between the own device (terminal device 100) and the relative zone in which the terminal device of the NAK transmission source is located. The distance between the data source or own device (terminal device 100) and the relative zone is the distance from the data source or own device (terminal device 100) to a predetermined point in the relative zone. Is. For example, the position coordinates of the center point of the relative zone may be used to calculate the distance, and the position coordinates of the apex of the relative zone farthest or closest to the data source or the own device (terminal device 100) are the distance. It may be used for calculation.
  • the distance difference determination unit 128 calculates the calculated distance difference, and determines whether or not to relay the data to the terminal device of the NAK transmission source by comparing the calculated distance difference with the predetermined threshold value. Specifically, the distance difference determination unit 128 determines the distance between the own device and the relative zone of the NAK source from the distance between the wireless communication device of the data source and the relative zone of the NAK source. When the distance difference obtained by subtracting is equal to or greater than a predetermined threshold value, it is determined that the data is relayed. On the other hand, the distance difference determination unit 128 determines that the data is not relayed when the calculated distance difference is less than a predetermined threshold value.
  • one unit of zone is repeatedly arranged with a plurality of (for example, 32) zones as a unit. .. Therefore, there are a plurality of zones having the same identification information, and the distance between the terminal devices may not be calculated correctly.
  • a relative zone is arranged based on the data source, a feedback channel for NAK transmission is selected using the relative zone, and a distance difference is used using the relative zone. Executes the judgment of. Therefore, it is possible to accurately calculate the distance between the terminal devices and improve the accuracy of the determination regarding the distance difference.
  • the distance from the data source to the relative zone where the NAK source is located and the relative zone where the NAK source is located from the terminal device that may relay the data is calculated to determine the presence or absence of data relay.
  • the relative zone in which the terminal device that relays the data is located is determined in advance according to the relative zone in which the NAK source is located. You can stay. That is, since the distance from the data source to each relative zone is always the same, for each relative zone in which the terminal device (hereinafter referred to as “target UE”) to which the data is retransmitted is located, with respect to the target UE.
  • a relative zone in which a terminal device for relaying data (hereinafter referred to as “relay UE”) is located may be defined.
  • each terminal device may hold a relay zone table showing the correspondence between the relative zone where the target UE is located and the relative zone where the relay UE is located. Then, the terminal device identifies the relative zone in which the target UE is located from the feedback channel in which NAK is detected, and determines whether or not the own device is located in the relative zone of the relay UE by referring to the relay zone table. do. The terminal device relays data to the target UE when its own device is located in the relative zone of the relay UE.
  • the relative zone in which the distance to the relative zone where the target UE is located is closer than the data source is defined as the zone of the relay UE. ..
  • the terminal devices located in the relative zones F2, F8, and F10 that are closer to the relative zone F1 than the data source becomes the relay UE.
  • the terminal devices located in the relative zones F1, F7, F8, F9, F10, F22, and F23 closer to the relative zone F24 than the data source are relayed. Become a UE.
  • the case of a wireless communication system in which a plurality of terminal devices are not connected to the network has been described.
  • the plurality of terminal devices are connected to the network, for example, wireless communication with the base station device.
  • the same relay method as in each of the above embodiments can be applied to the wireless communication system. That is, for example, when a base station device group casts data to a plurality of terminal devices belonging to a group, the terminal device that fails to decode the data transmits NAK using a feedback channel according to the position of the own device. A terminal device that succeeds in decoding the data and satisfies the conditions may relay the data. In this way, even when the wireless communication system is connected to the network, the terminal device that has detected the NAK can autonomously act as a relay station and relay data without designating a relay station from the network.
  • Wireless communication unit 120 Processor 121 Control information generation unit 122 Transmission data generation unit 123 Transmission control unit 124 Reception control unit 125 NAK generation unit 126 Reception data buffer unit 127 NAK detection unit 128 Distance difference judgment unit 129 Retransmission data acquisition unit 130 Memory

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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CN202080093211.8A CN114982322A (zh) 2020-01-20 2020-01-20 无线通信装置、无线通信系统以及无线通信方法
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