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WO2020144813A1 - Dispositif de communication et système de communication sans fil - Google Patents

Dispositif de communication et système de communication sans fil Download PDF

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Publication number
WO2020144813A1
WO2020144813A1 PCT/JP2019/000527 JP2019000527W WO2020144813A1 WO 2020144813 A1 WO2020144813 A1 WO 2020144813A1 JP 2019000527 W JP2019000527 W JP 2019000527W WO 2020144813 A1 WO2020144813 A1 WO 2020144813A1
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WO
WIPO (PCT)
Prior art keywords
resource
data signal
signal
released
scheduler
Prior art date
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Ceased
Application number
PCT/JP2019/000527
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English (en)
Japanese (ja)
Inventor
紅陽 陳
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 PCT/JP2019/000527 priority Critical patent/WO2020144813A1/fr
Publication of WO2020144813A1 publication Critical patent/WO2020144813A1/fr
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    • 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
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a communication device and a wireless communication system.
  • the traffic of mobile terminals (smartphones and feature phones) accounts for most of the network resources. Also, the traffic used by mobile terminals tends to continue to grow.
  • eMBB Enhanced Mobile BroadBand
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communication
  • V2X Vehicle to Everything
  • V2X refers to V2V (Vehicle to Vehicle) that indicates inter-vehicle communication
  • V2P Vehicle to Pedestrian
  • road infrastructure such as a car and a sign that use side link channels.
  • V2I Vehicle to Infrastructure
  • V2N Vehicle to Network
  • V2X in order to improve the reliability of communication, it is considered to transmit the transmission data multiple times. For example, a mode in which the allocation pattern of the resources used by each terminal device for the initial transmission and the retransmission of the data is notified in advance from the base station device, and each terminal device performs the initial transmission and the retransmission of the data according to the allocation pattern. Have been discussed.
  • 3GPP TS 22.186 V16.0.0 (2018-09) 3GPP TS 36.211 V15.2.0 (2018-06) 3GPP TS 36.212 V15.2.1 (2018-07) 3GPP TS 36.213 V15.2.0 (2018-06) 3GPP TS 36.300 V15.2.0 (2018-06) 3GPP TS 36.321 V15.2.0 (2018-07) 3GPP TS 36.322 V15.1.0 (2018-07) 3GPP TS 36.323 V15.0.0 (2018-07) 3GPP TS 36.331 V15.2.2 (2018-06) 3GPP TS 36.413 V15.2.0 (2018-06) 3GPP TS 36.423 V15.2.0 (2018-06) 3GPP TS 36.425 V15.0.0 (2018-06) 3GPP TS 37.340 V15.2.0 (2018-06) 3GPP TS 38.201 V15.0.0 (2017-12) 3GPP TS 38.202 V15.2.0 (2018-06)
  • the disclosed technology has been made in view of the above points, and an object thereof is to provide a communication device and a wireless communication system capable of improving resource utilization efficiency.
  • a communication device disclosed by the present application, a scheduler that determines a resource for transmitting and retransmitting a data signal, a transmitting unit that transmits a data signal using the resource determined by the scheduler, A receiver for receiving a feedback signal indicating whether or not the data signal transmitted by the transmitter can be decoded, and the scheduler indicates that the feedback signal received by the receiver indicates that the data signal has been decoded.
  • the resource for retransmitting the data signal is released.
  • the communication device and the wireless communication system disclosed in the present application it is possible to improve the resource utilization efficiency.
  • FIG. 1 is a block diagram showing the configuration of the terminal device according to the first embodiment.
  • FIG. 2 is a flowchart showing the first operation of the terminal device according to the first embodiment.
  • FIG. 3 is a flowchart showing the second operation of the terminal device according to the first embodiment.
  • FIG. 4 is a diagram showing a specific example of resource use according to the first embodiment.
  • FIG. 5 is a block diagram showing the configuration of the terminal device according to the second embodiment.
  • FIG. 6 is a flowchart showing the operation of the second terminal device according to the second embodiment.
  • FIG. 7 is a diagram showing a specific example of resource use according to the second embodiment.
  • FIG. 8 is a diagram showing a specific example of resource use according to the third embodiment.
  • the wireless communication system has a plurality of terminal devices provided in, for example, automobiles, pedestrians, road infrastructures, and the like. These terminal devices can wirelessly communicate with each other, and can wirelessly communicate with the base station device within the radio wave reachable range from the base station device of the cellular system constructed by the communication carrier, for example.
  • FIG. 1 is a block diagram showing the configuration of the terminal device 100 according to the first embodiment.
  • the terminal device 100 illustrated in FIG. 1 includes a processor 110, a memory 120, a wireless transmission unit 130, and a wireless reception unit 140.
  • a processing unit related to wireless communication between terminal devices is illustrated, and a processing unit related to wireless communication with a base station device is omitted.
  • the processor 110 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), and the like, and integrally controls the entire terminal device 100.
  • the processor 110 includes a V2X scheduler 111, a data signal generation unit 112, an SCI (Sidelink Control Information) generation unit 113, a resource release signal generation unit 114, a control signal generation unit 115, a control signal decoding unit 116, and a data signal.
  • a decoding unit 117, a feedback (FB: Feed Back) signal detection unit 118, and a resource release signal detection unit 119 are included.
  • the V2X scheduler 111 executes V2X communication scheduling. Specifically, the V2X scheduler 111 determines the resource used for data transmission, and notifies the data signal generation unit 112 and the SCI generation unit 113 of the determined resource. At this time, the V2X scheduler 111 not only determines the resource for the initial transmission but also the resource for the retransmission for the transmission of one data. When deciding the resource, the V2X scheduler 111 selects the resource estimated not to be used by another terminal device, for example, from the result of sensing all the frequency bands available for data transmission in a predetermined sensing period. Alternatively, a resource designated in advance may be selected during wireless communication with the base station device.
  • the V2X scheduler 111 cancels this data retransmission and releases the resources reserved for the data retransmission. Then, the V2X scheduler 111 notifies the resource release signal generation unit 114 that the resource has been released.
  • the V2X scheduler 111 releases the data to be transmitted. Decide to use the specified resource. Then, the V2X scheduler 111 notifies the data signal generation unit 112 and the SCI generation unit 113 that the released resource will be used.
  • the data signal generation unit 112 generates a data signal including transmission data, and uses the resource determined by the V2X scheduler 111 to transmit the data signal via the wireless transmission unit 130. Specifically, the data signal generation unit 112 retransmits the same data signal using the resource for retransmission even after the initial transmission of the data signal. However, the data signal generation unit 112 does not retransmit the data signal when the retransmission is canceled.
  • the SCI generation unit 113 generates an SCI including control information regarding the resource determined by the V2X scheduler 111. Specifically, the SCI generation unit 113 is used for the maximum number of retransmissions of the data signal, the current number of transmissions of the data signal, the resources to be used for returning the FB signal such as ACK or NACK, and the data signal. SCI including information such as resources to be generated is generated.
  • the information indicating the current number of transmissions of the data signal is, for example, RV (Redundancy Version). If RV is 0, it indicates that the data signal is to be transmitted for the first time, and if RV is 1, it indicates that the data signal is to be retransmitted for the first time.
  • RV Redundancy Version
  • the resource release signal generation unit 114 generates a resource release signal indicating that the resource reserved for the retransmission of the data signal is released when the V2X scheduler 111 cancels the retransmission of the data signal. ..
  • the resource release signal generation unit 114 indicates, for example, that a resource reserved for retransmission of a data signal is used as “0” and that this resource is released as “1”, which is a 1-bit resource. Generate an open signal. That is, the resource release signal generation unit 114 generates a resource release signal indicating whether or not the resource for retransmission is used. However, the resource release signal generation unit 114 may generate the resource release signal only when the resource for retransmission is released.
  • the control signal generation unit 115 generates a control signal including the SCI and the resource release signal, and transmits the control signal via the wireless transmission unit 130 using the resource determined by the V2X scheduler 111.
  • the data signal generation unit 112 and the control signal generation unit 115 transmit the control signal at the beginning of the slot, for example, and transmit the corresponding data signal subsequent to the control signal.
  • the control signal decoding unit 116 receives the control signal via the wireless reception unit 140, and demodulates and decodes the control signal. That is, the control signal decoding unit 116 demodulates and decodes the control signal arranged at the beginning of the slot, for example.
  • the control signal decoded by the control signal decoding unit 116 includes the SCI and the resource release signal. Further, the control signal decoding unit 116 demodulates and decodes the FB signal such as ACK or NACK arranged at the end of the slot.
  • the FB signal is a signal indicating whether the data transmitted by the terminal device 100 has been correctly decoded on the receiving side, and the resource used for returning the FB signal is designated by the control signal transmitted by the control signal generation unit 115. Has been done.
  • the control signal decoding unit 116 When the control signal decoding unit 116 detects that the resource is released as a result of decoding the resource release signal, the control signal decoding unit 116 indicates the current number of times of transmission of the data signal such as RV, which is information included in the SCI. Decrypt the information. After that, the control signal decoding unit 116 can omit SCI decoding from the current number of transmissions to the maximum number of data signal retransmissions. This is because when the resource is released, the retransmission of the data signal is canceled and the SCI corresponding to the data signal is not transmitted.
  • the information about the maximum number of retransmissions of the data signal may be included in the SCI at the time of the first transmission of the data signal, and the SCI at the time of retransmission includes information indicating the current number of transmissions of the data signal. If so, the omission of the above SCI decoding can be realized. That is, it is possible to reduce the size of the SCI. Further, when the control signal decoding unit 116 detects that the resource is used, the control signal decoding unit 116 decodes the SCI as usual and specifies the resource used for transmitting the data signal.
  • the data signal decoding unit 117 receives the data signal via the wireless reception unit 140, and demodulates and decodes the data signal according to the SCI decoded by the control signal decoding unit 116. That is, the data signal decoding unit 117 specifies the resource of the data signal based on the SCI, and demodulates and decodes the data signal received in this resource. Although omitted in FIG. 1, when the decoding of the data signal is successful, the data signal decoding unit 117 transmits an ACK indicating that the data signal is correctly decoded as an FB signal from the wireless transmission unit 130. Further, when the decoding of the data signal fails, the data signal decoding unit 117 may transmit NACK indicating that the data signal was not correctly decoded from the wireless transmission unit 130 as an FB signal.
  • the FB signal detection unit 118 detects an FB signal such as ACK or NACK from the control signal decoded by the control signal decoding unit 116. Then, when the FB signal detection unit 118 detects an ACK indicating that the data signal is correctly decoded on the receiving side, it notifies the V2X scheduler 111 of that fact. Upon receiving this notification, the V2X scheduler 111 cancels the subsequent retransmission of the data signal.
  • an FB signal such as ACK or NACK from the control signal decoded by the control signal decoding unit 116.
  • the resource release signal detection unit 119 detects the resource release signal from the control signal decoded by the control signal decoding unit 116. That is, the resource release signal detection unit 119 detects the resource release signal transmitted from this terminal device when another terminal device cancels the retransmission of the data signal. When the resource release signal detection unit 119 detects the resource release signal, the resource release signal detection unit 119 notifies the V2X scheduler 111 that resources reserved by other terminal devices have been released.
  • the memory 120 includes, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory), and stores information used by the processor 110 to execute processing.
  • a RAM Random Access Memory
  • ROM Read Only Memory
  • the wireless transmission unit 130 performs wireless transmission processing such as D/A (Digital/Analog) conversion and up-conversion on the data signal and the control signal generated by the processor 110, and wirelessly transmits the signals through the antenna.
  • wireless transmission processing such as D/A (Digital/Analog) conversion and up-conversion on the data signal and the control signal generated by the processor 110, and wirelessly transmits the signals through the antenna.
  • the wireless reception unit 140 performs wireless reception processing such as down conversion and A/D (Analog/Digital) conversion on the reception signal wirelessly received via the antenna, and outputs it to the processor 110.
  • the received signal includes a data signal and a control signal.
  • FIG. 2 is a flowchart showing a first operation of terminal device 100 transmitting a data signal.
  • the terminal device 100 releases the resource reserved for the retransmission when the retransmission of the data signal becomes unnecessary.
  • the V2X scheduler 111 determines the resource used for transmitting the data.
  • the resource may be determined, for example, by selecting a resource estimated not to be used by another terminal device from the sensing result in a predetermined sensing period, or may be designated in advance during wireless communication with the base station device. The selected resource may be selected. Further, in determining resources, not only resources for initial transmission of data but also resources for retransmission are determined and secured.
  • the SCI including the information on this resource is generated by the SCI generation unit 113.
  • the control signal generation unit 115 generates a control signal including the SCI, and transmits the control signal in a predetermined resource such as the beginning of the slot (step S101).
  • the control signal includes information such as the maximum number of retransmissions of the data signal, the current number of transmissions of the data signal, resources to be used for returning the FB signal and resources used for transmitting the data signal.
  • the data signal generation unit 112 generates a data signal including transmission data, and the data signal is first transmitted in the resource following the resource of the control signal (step S102).
  • the SCI included in the control signal is decoded, and the data signal is decoded based on the SCI.
  • the FB signal indicating whether the decoding of the data signal has succeeded is transmitted from the terminal device on the receiving side. At this time, the FB signal is transmitted using the resource designated by the SCI.
  • the FB signal transmitted from the terminal device on the receiving side is received by the control signal decoding unit 116 via the wireless reception unit 140. Then, the FB signal is demodulated and decoded by the control signal decoding unit 116, and then detected by the FB signal detection unit 118 (step S103). Further, the FB signal detection unit 118 determines whether or not the detected FB signal is an ACK indicating that the decoding of the data signal has succeeded (step S104).
  • the V2X scheduler 111 cancels the retransmission of the data signal because it is not necessary to retransmit the data signal (step S105). Then, the resource release signal indicating that the resource reserved for the retransmission of the data signal is released is generated by the resource release signal generation unit 114, and the control signal including the resource release signal is transmitted by the control signal generation unit 115. (Step S106).
  • the control signal including the resource release signal is transmitted in a predetermined resource such as the head of the slot, like the control signal including the SCI.
  • another terminal device that receives the resource release signal can transmit the data signal using the released resource. In other words, since the data signal is not retransmitted unnecessarily, useless consumption of resources can be avoided and the utilization efficiency of resources can be improved.
  • step S104 if the result of determination in step S104 is that the FB signal is NACK (No in step S104), since it is necessary to retransmit the data signal, the V2X scheduler 111 decides to continue the retransmission of the data signal. To be done. Then, the control signal including the SCI is transmitted from the control signal generation unit 115 using the resources reserved for the retransmission of the data signal (step S107), and the already transmitted data signal is transmitted from the data signal generation unit 112. It is retransmitted (step S108). Thus, when the ACK for the data signal is not received, the data signal is retransmitted using the resources reserved for retransmission until the number of retransmissions reaches a predetermined maximum number of retransmissions. To be done.
  • FIG. 3 is a flowchart showing a second operation of the terminal device 100 transmitting a data signal.
  • the terminal device 100 detects the resource release signal, the terminal device 100 transmits the data signal using the released resource.
  • the terminal device 100 receives a control signal arranged in a predetermined resource such as the head of a slot, and monitors whether or not a data signal addressed to itself is transmitted. That is, the control signal decoding unit 116 receives the control signal via the wireless reception unit 140 (step S201), and the control signal is demodulated and decoded. If the decoded control signal includes the SCI related to the data signal addressed to the own device, the data signal decoding unit 117 demodulates and decodes the data signal addressed to the own device according to the SCI.
  • the resource release signal detection unit 119 monitors whether or not the resource release signal is detected from the control signal (step S202). As a result, when the resource release signal is not detected (No in step S202), it is understood that there is no resource to be released and another terminal device continues to retransmit the data signal.
  • the V2X scheduler 111 is notified that the resource secured by the other terminal device is released. Then, when there is data to be transmitted, the V2X scheduler 111 decides to use the released resource. Specifically, it is well known that the released resource is used, and the SCI including the information about the resource used for transmitting the data signal is generated by the SCI generating unit 113, and the control signal including the SCI is generated by the control signal. It is transmitted by the unit 115 (step S203).
  • This SCI may be transmitted, for example, using the resource in the middle of the slot in which the resource at the beginning was used for transmitting the resource release signal. That is, the SCI may be transmitted by using the resource at the head of the minislot other than the head minislot among the plurality of minislots forming the slot.
  • the resource used for transmitting such SCI may be designated by the resource release signal.
  • a unique backoff time is set in advance for each terminal, and each terminal starts backoff from the beginning of the minislot.
  • the SCI may be transmitted after waiting for a time.
  • each terminal device senses whether another terminal device has started transmission. Then, the terminal device starts the transmission of the SCI when the transmission by the other terminal device is not started even after the backoff time set in the own device has elapsed.
  • the data signal generation unit 112 generates a data signal including transmission data, and the data signal is transmitted in the resource following the SCI resource (step S204). Accordingly, when another terminal device releases the resource reserved for the retransmission of the data signal, the terminal device 100 can use the released resource to transmit the data signal. In other words, the resource released by canceling the retransmission of the data signal can be effectively used, and the resource utilization efficiency can be improved.
  • each terminal device uses the resources of subchannels #1 and #2 to transmit control signals and data signals.
  • the control signal includes information related to the resource of the data signal, and information indicating that the data signal in slot #0 has been transmitted for the first time and that the maximum number of retransmissions of this data signal is three times. Is included.
  • the control signal for slot #0 includes SCI.
  • the control signal includes information designating a resource to be used for returning the FB signal to the data signal. That is, for example, the control signal of the sub-channel #1 includes information indicating at which frequency and time of the resource allocated to the SFCI the FB signal for the data signal of the sub-channel #1 should be returned.
  • the data signal corresponding to the SCI included in the control signal is transmitted on each of subchannels #1 and #2.
  • the FB signal for this data signal is transmitted using the resources allocated to the SFCI. That is, ACK is transmitted when the decoding of the data signal is successful in the receiving side terminal device, and NACK is transmitted when the decoding of the data signal fails.
  • each terminal device transmits a control signal according to the FB signal in slot #0.
  • the description will be continued assuming that both terminal devices using the sub-channels #1 and #2 received NACK in slot #0 or did not receive the FB signal.
  • each terminal device uses the control signal including SCI as the control signal for slot #1 as in slot #0. To send.
  • This SCI includes information indicating that the data signal in slot #1 is a retransmission of the data signal in slot #0.
  • the data signal initially transmitted in slot #0 is retransmitted in subchannels #1 and #2.
  • the FB signal for the data signal is transmitted using the resource assigned to the SFCI, as in slot #0.
  • each terminal device transmits a control signal according to the FB signal in slot #1.
  • the terminal device that uses subchannel #1 receives ACK in slot #1
  • the terminal device that uses subchannel #2 receives NACK in slot #1 or does not receive an FB signal.
  • the terminal device using subchannel #2 retransmits the data signal transmitted in slot #0, as in slot #1.
  • the terminal device using the sub-channel #1 cancels the retransmission of this data signal because the data signal transmitted in the slots #0 and #1 was correctly decoded by the terminal device on the receiving side.
  • the terminal device transmits a control signal 151 including a resource release signal as a control signal for slot #2.
  • the control signal 151 includes information indicating that the resources of the subchannel #1 after the slot #2 are released, and the control signal 152 is placed at the head of the minislots forming the slot #2. Is included.
  • the terminal device in the wireless communication system monitors the control signal of each slot in order to detect the data signal addressed to itself. Therefore, it is well known that the control signal 151 including the resource release signal is received by all the terminal devices in the vicinity, and the resources of the subchannel #1 and the slots after the slot #2 are released. Then, the terminal device that uses the released resource is known to transmit the control signal 152 including the SCI at the head of the minislot to use the released resource. Then, the data signal 153 is transmitted following the control signal 152. As described above, in slot #2 of subchannel #1, the retransmission of the data signal is canceled and the resource is released, and another terminal device transmits the data signal using the released resource.
  • slot #3 the resource of subchannel #1 is released similarly to slot #2, so that the terminal device that has transmitted control signal 152 and data signal 153 continues to transmit control signal 154 and data signal 155.
  • subchannel #1 resources after slot #2 are released, so that another terminal device can transmit a data signal and effective use of resources can be achieved.
  • the transmitting side terminal device cancels the retransmission of the data signal and transmits the resource release signal. To do. Then, the other terminal device grasps the resource released by the resource release signal and uses the released resource for transmitting the data signal. Therefore, the resource released by canceling the retransmission of the data signal can be effectively used, and the resource utilization efficiency can be improved.
  • the SCI and the resource release signal are generated separately in the first embodiment, they may be generated as one control signal such as generating the SCI including the resource release signal. Needless to say.
  • FIG. 5 is a block diagram showing the configuration of the terminal device 100 according to the second embodiment. 5, parts that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted.
  • the resource release signal generation unit 114 and the resource release signal detection unit 119 of the terminal device 100 shown in FIG. 1 are deleted, and the V2X scheduler 111, the control signal decoding unit 116, and the FB signal detection unit 118 are added. Instead, it has a V2X scheduler 203, a control signal decoding unit 201, and an FB signal relating unit 202.
  • the control signal decoding unit 201 receives the control signal via the wireless reception unit 140, and demodulates and decodes the control signal. That is, the control signal decoding unit 201 demodulates and decodes the control signal arranged at the beginning of the slot, for example.
  • the control signal decoded by the control signal decoding unit 201 includes SCI. Further, the control signal decoding unit 201 demodulates and decodes the FB signal such as ACK or NACK arranged at the end of the slot.
  • the control signal decoding unit 201 demodulates and decodes not only the FB signal for the data signal transmitted from the terminal device 100 but also the FB signal for the data signal transmitted from another terminal device.
  • the FB signal monitoring unit 202 monitors an FB signal such as ACK or NACK decoded by the control signal decoding unit 201. Then, when the FB signal monitoring unit 202 detects an ACK related to the data signal transmitted from the terminal device 100, the FB signal monitoring unit 202 notifies the V2X scheduler 203 of that fact. Also, when the FB signal monitoring unit 202 detects an ACK related to a data signal transmitted from another terminal device, the FB signal monitoring unit 202 also notifies the V2X scheduler 203 of that fact.
  • the V2X scheduler 203 executes V2X communication scheduling. Specifically, the V2X scheduler 203 determines the resource used for transmitting the data signal, and notifies the determined resource to the data signal generation unit 112 and the SCI generation unit 113. At this time, the V2X scheduler 203 determines not only the resource for initial transmission but also the resource for retransmission for transmission of one data signal. In determining the resource, the V2X scheduler 203 selects a resource that is estimated not to be used by another terminal device, for example, from the result of sensing all frequency bands available for data signal transmission in a predetermined sensing period. Alternatively, a resource designated in advance may be selected during wireless communication with the base station device.
  • the V2X scheduler 203 cancels this data retransmission and reserves the resource reserved for the data retransmission. Open up.
  • the V2X scheduler 203 determines that the resource reserved for the retransmission of this data signal is released. To do. Then, if there is data to be transmitted, the V2X scheduler 203 determines to use the released resource for transmitting the data signal, and to use the released resource, the data signal generation unit 112 and the SCI generation. Notify the unit 113.
  • FIG. 6 is a flowchart showing a second operation of transmitting a data signal using the released resource.
  • the same parts as those in FIG. 6 are identical parts as those in FIG.
  • the terminal device 100 receives a control signal arranged in a predetermined resource such as the head of a slot, and monitors whether or not a data signal addressed to itself is transmitted. That is, the control signal decoding unit 201 receives the control signal via the wireless reception unit 140 (step S301), and the control signal is demodulated and decoded. If the decoded control signal includes the SCI related to the data signal addressed to the own device, the data signal decoding unit 117 demodulates and decodes the data signal addressed to the own device according to the SCI.
  • the FB signal monitoring unit 202 monitors whether or not an ACK for a data signal transmitted from another terminal device is detected (step S302). That is, not only the FB signal for the data signal transmitted from the terminal device 100 but also the FB signal for the data signal transmitted from the other terminal device is monitored, and the data signal transmitted from the other terminal device is correctly received at the receiving side. It is determined whether or not it has been decrypted. As a result, when ACK is not detected (No in step S302), it is understood that there is no resource to be released and another terminal device continues to retransmit the data signal.
  • step S302 when the ACK for the data signal transmitted from the other terminal device is detected (Yes in step S302), it is determined that the resource reserved for the retransmission of the data signal by the other terminal device is released. It Then, the V2X scheduler 203 is notified that the resource is released, and if there is data to be transmitted, the V2X scheduler 203 decides to use the released resource. As a result, the control signal generating unit 115 transmits the control signal including the SCI using the released resource (step S203), and the data signal generating unit 112 transmits the data signal (step S204). Thereby, when another terminal device releases the resource reserved for the retransmission of the data signal, the terminal device 100 can transmit the data signal using the released resource. In other words, the resources released by canceling the retransmission of the data signal can be effectively used, and the resource utilization efficiency can be improved.
  • the first transmission and the retransmission of the data signal are executed in both subchannels #1 and #2 as in the first embodiment.
  • the ACK is transmitted using the resource of the SFCI 211 of slot #1.
  • the ACK is received by all the terminal devices in the vicinity, and it is understood that the resources of slot #2 and later of subchannel #1 are released. That is, the terminal device in the vicinity not only decodes the FB signal addressed to the own device but also decodes the FB signal addressed to another device and recognizes that the resource is released.
  • the terminal device that uses the released resource transmits the control signal 152 including the SCI at the head of the minislot to use the released resource. Then, the data signal 153 is transmitted following the control signal 152. As described above, in slot #2 of subchannel #1, the retransmission of the data signal is canceled and the resource is released, and another terminal device transmits the data signal using the released resource. In this way, the resource of the released slot #2 can be used for another terminal device. Further, the other terminal device can also communicate using the resources of slot #3 and later.
  • each terminal device when the data signal is correctly decoded at the receiving side terminal device, each terminal device detects the ACK transmitted from the receiving side terminal device, and the data signal It is determined that the resources reserved for the retransmission of are released. Then, each terminal device uses it for transmitting the resource data signal determined to be released. Therefore, the resource released by canceling the retransmission of the data signal can be effectively used, and the resource utilization efficiency can be improved. Further, the terminal device on the transmission side does not need to transmit the resource release signal, and an additional signal such as the resource release signal can be unnecessary.
  • the resource release and reuse described in the first and second embodiments can be applied even when the resource allocation pattern is designated by the base station device, for example.
  • a pattern of resources used for initial transmission and retransmission of a data signal for each terminal device is determined as shown in FIG. 8 and is notified from the base station device to each terminal device.
  • resources of times t0 to t4 and frequencies f0 to f3 are allocated to ten terminal devices of UEs #1 to #10, respectively.
  • the resources (t0,f0) and (t1,f2) are allocated to the terminal device UE#1, and the resources (t0,f1) and (t2,f3) are allocated to the terminal device UE#2. ing.
  • Such a resource allocation pattern is previously notified from the base station apparatus to each terminal apparatus. Then, each terminal device uses the resources allocated to itself for the initial transmission and retransmission of the data signal.
  • the terminal device UE#3 uses the resource (t0, f2) allocated for the initial transmission,
  • the resource release signal is transmitted as in the first embodiment.
  • the resource release signal is received by another terminal device, and it is understood that the (t3, f0) resource 301 allocated for retransmission by the terminal device UE#3 is released. Therefore, another terminal device can use this resource 301 to transmit a data signal.
  • each terminal device when each ACK is transmitted/received for the data signal transmitted for the first time, each terminal device is Similar to 2, it can be understood that the resource for retransmission is released. Then, the terminal device, which recognizes that the resource is released, can use the released resource to transmit the data signal.
  • the terminal device UE#10 to which the resource adjacent to the resource 301 is assigned may use the resource 301.
  • the terminal device UE#10 may use the resource 301 to transmit the same data signal as the data signal to be transmitted using the (t3, f1) resource previously assigned to the own device. By doing so, redundancy can be secured and highly reliable communication can be executed.
  • the resource to which the representative terminal device is released is There is a method of allocating to that terminal device.
  • the resource release signal may be transmitted only to the representative terminal device.
  • a terminal device to which a resource of the same time as the resource to be released is allocated uses the released resource according to the priority order.
  • the terminal devices UE#6, #8, and #10 to which resources of the same time as the resource 301 are allocated, may use the resource 301 according to a predetermined priority order.
  • the terminal devices UE#6, #8, and #10 perform sensing for a short time in the order according to their respective priorities, and after confirming that the higher-level terminal device does not use the resource 301, You may use 301.
  • the base station apparatus determines the resource allocation pattern as described above but also when the base station apparatus individually allocates resources to the terminal apparatus, the resource allocation described in the first and second embodiments is not performed. It is possible to apply open and reuse. That is, when the base station device determines the resources for the initial transmission and the retransmission by each terminal device in advance, the base station device performs the retransmission according to the FB signal from the terminal device after the initial transmission. Resources may be released. Then, the base station device may allocate the released resource to another terminal device.

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

Abstract

Un dispositif de communication (100) comprend : un ordonnanceur (111, 203) qui détermine une ressource pour émettre et retransmettre un signal de données; une unité de transmission (112, 130) qui transmet le signal de données en utilisant la ressource déterminée par l'ordonnanceur (111, 203); et une unité de réception (116, 140, 201) qui reçoit un signal de rétroaction indiquant si le signal de données transmis par l'unité de transmission (112, 130) peut être décodé. Lorsque le signal de rétroaction reçu par l'unité de réception (116, 140, 201) indique que le signal de données a été décodé, l'ordonnanceur (111, 203) libère la ressource pour retransmettre le signal de données.
PCT/JP2019/000527 2019-01-10 2019-01-10 Dispositif de communication et système de communication sans fil Ceased WO2020144813A1 (fr)

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WO2022076719A1 (fr) * 2020-10-09 2022-04-14 Qualcomm Incorporated Techniques d'annulation de ressources de liaison latérale utilisant l'attribution de ressources de domaine temporel
WO2022076728A1 (fr) * 2020-10-09 2022-04-14 Qualcomm Incorporated Techniques d'indication d'une configuration au moyen d'une indication d'attribution de ressources

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022076719A1 (fr) * 2020-10-09 2022-04-14 Qualcomm Incorporated Techniques d'annulation de ressources de liaison latérale utilisant l'attribution de ressources de domaine temporel
US20220116927A1 (en) * 2020-10-09 2022-04-14 Qualcomm Incorporated Techniques for sidelink resource cancellation using time domain resource allocation
WO2022076728A1 (fr) * 2020-10-09 2022-04-14 Qualcomm Incorporated Techniques d'indication d'une configuration au moyen d'une indication d'attribution de ressources
CN116326089A (zh) * 2020-10-09 2023-06-23 高通股份有限公司 用于使用时域资源分配进行侧链路资源取消的技术
CN116349348A (zh) * 2020-10-09 2023-06-27 高通股份有限公司 使用资源分配指示来指示配置的技术
US12069661B2 (en) * 2020-10-09 2024-08-20 Qualcomm Incorporated Techniques for sidelink resource cancellation using time domain resource allocation
US12256385B2 (en) 2020-10-09 2025-03-18 Qualcomm Incorporated Techniques for indicating a configuration using a resource allocation indication

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