WO2022219728A1 - Terminal et procédé de communication - Google Patents

Terminal et procédé de communication Download PDF

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Publication number
WO2022219728A1
WO2022219728A1 PCT/JP2021/015363 JP2021015363W WO2022219728A1 WO 2022219728 A1 WO2022219728 A1 WO 2022219728A1 JP 2021015363 W JP2021015363 W JP 2021015363W WO 2022219728 A1 WO2022219728 A1 WO 2022219728A1
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Prior art keywords
terminal
resource
communication
transmission
resources
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PCT/JP2021/015363
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English (en)
Japanese (ja)
Inventor
翔平 吉岡
尚哉 芝池
聡 永田
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株式会社Ｎｔｔドコモ
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Priority to PCT/JP2021/015363 priority Critical patent/WO2022219728A1/fr
Publication of WO2022219728A1 publication Critical patent/WO2022219728A1/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

Definitions

  • the present invention relates to a terminal and communication method in a wireless communication system.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • NR New Radio
  • 5G New Radio
  • terminals communicate directly without a base station D2D (Device to Device) technology is being studied (for example, Non-Patent Document 1).
  • D2D reduces traffic between terminals and base stations, and enables communication between terminals even when base stations are unable to communicate due to disasters, etc.
  • 3GPP 3rd Generation Partnership Project
  • D2D reduces traffic between terminals and base stations, and enables communication between terminals even when base stations are unable to communicate due to disasters, etc.
  • 3GPP refers to D2D as a "sidelink,” but the more general term D2D is used herein.
  • side links are also used as necessary in the description of the embodiments to be described later.
  • D2D communication includes D2D discovery (also referred to as D2D discovery) for discovering other terminals that can communicate, and D2D communication (D2D direct communication, D2D communication, direct communication between terminals) for direct communication between terminals. It is also called communication, etc.).
  • D2D discovery also referred to as D2D discovery
  • D2D communication D2D direct communication, D2D communication, direct communication between terminals
  • D2D signal A signal transmitted and received in D2D is called a D2D signal.
  • Various use cases of services related to V2X (Vehicle to Everything) in NR are being considered (for example, Non-Patent Document 2).
  • eURLC enhanced Ultra Reliable Low Latency Communication
  • resource allocation mode 2 in which the terminal autonomously selects resources, the terminal 20A shares information indicating the resource set with the terminal 20B, and the terminal 20B uses the information in resource selection for transmission.
  • the reliability of communication is improved and the delay is reduced.
  • resource allocation mode 2 when the transmitting terminal performs sensing, for example, if there is another terminal in the line of sight from the transmitting terminal, the quality of the resource in the receiving terminal is may be significantly different from the quality based on the sensing results.
  • the present invention has been made in view of the above points, and aims to improve the reliability of communication during autonomous resource selection in direct communication between terminals.
  • a receiving unit that receives a signal from another terminal in a resource in a resource pool, a control unit that detects at least one of decoding failure and resource collision in the resource, and the control unit decodes in the resource a transmitting unit configured to transmit a signal related to at least one of decoding failure and resource collision to the other terminal when at least one of decoding failure and resource collision is detected, wherein the signal related to at least one of decoding failure and resource collision is provided with a terminal that includes HARQ (Hybrid automatic repeat request) feedback.
  • HARQ Hybrid automatic repeat request
  • FIG. 2 is a diagram for explaining an example (1) of a V2X transmission mode
  • FIG. 3 is a diagram for explaining an example (2) of a V2X transmission mode
  • FIG. 10 is a diagram for explaining an example (3) of a V2X transmission mode
  • FIG. 11 is a diagram for explaining an example (4) of a V2X transmission mode
  • FIG. 11 is a diagram for explaining an example (5) of a V2X transmission mode
  • FIG. 2 is a diagram for explaining an example (1) of a V2X communication type
  • FIG. 3 is a diagram for explaining an example (2) of a V2X communication type
  • FIG. 10 is a diagram for explaining an example (3) of a V2X communication type
  • FIG. 4 is a sequence diagram showing an operation example (1) of V2X;
  • FIG. 11 is a sequence diagram showing an operation example (2) of V2X;
  • FIG. 11 is a sequence diagram showing an operation example (3) of V2X;
  • FIG. 11 is a sequence diagram showing an operation example (4) of V2X;
  • FIG. 10 is a diagram showing an example of sensing operation; 4 is a flowchart for explaining an example of preemption operation;
  • FIG. 4 is a diagram showing an example of preemption operation;
  • FIG. 10 is a diagram showing an example of partial sensing operation;
  • FIG. 4 is a diagram for explaining an example (1) of communication status;
  • FIG. 10 is a diagram for explaining an example (2) of communication status;
  • FIG. 11 is a diagram for explaining an example (3) of communication status;
  • FIG. 11 is a diagram for explaining an example (4) of communication status;
  • FIG. 11 is a diagram for explaining an example (5) of communication status;
  • FIG. 4 is a sequence diagram for explaining an example of inter-UE cooperation according to the embodiment of the present invention; It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention.
  • 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention;
  • FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention;
  • LTE Long Term Evolution
  • LTE-Advanced and LTE-Advanced and later systems eg: NR
  • wireless LAN Local Area Network
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex etc.) method may be used.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • "configuring" wireless parameters and the like may mean that predetermined values are preset (Pre-configure), and the base station 10 or A wireless parameter notified from the terminal 20 may be set.
  • FIG. 1 is a diagram for explaining V2X.
  • V2X Vehicle to Everything
  • eV2X enhanced V2X
  • V2X is a part of ITS (Intelligent Transport Systems), V2V (Vehicle to Vehicle), which means a form of communication between vehicles, roadside V2I (Vehicle to Infrastructure), which means a form of communication between a vehicle (RSU: Road-Side Unit), V2N (Vehicle to Network), which means a form of communication between a vehicle and an ITS server, and , is a generic term for V2P (Vehicle to Pedestrian), which means a form of communication between a vehicle and a mobile terminal carried by a pedestrian.
  • ITS Intelligent Transport Systems
  • V2V Vehicle to Vehicle
  • roadside V2I Vehicle to Infrastructure
  • V2N Vehicle to Network
  • V2P Vehicle to Pedestrian
  • V2X using LTE or NR cellular communication is also called cellular V2X.
  • NR's V2X studies are underway to realize large capacity, low delay, high reliability, and QoS (Quality of Service) control.
  • LTE or NR V2X will be considered in the future, not limited to 3GPP specifications. For example, ensuring interoperability, reducing costs by implementing upper layers, using multiple RATs (Radio Access Technology) together or switching methods, complying with regulations in each country, acquiring and distributing LTE or NR V2X platform data, database management, and It is assumed that usage methods will be considered.
  • RATs Radio Access Technology
  • the communication device is mounted on a vehicle, but the embodiment of the present invention is not limited to this form.
  • the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, the communication device may be a base station, an RSU, a relay station (relay node), A terminal or the like having scheduling capability may be used.
  • SL Sidelink
  • UL Uplink
  • DL Downlink
  • SL may be another name.
  • Time domain resource allocation 2) Frequency domain resource allocation 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmission power control
  • SL or UL OFDM Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic-Prefix OFDM
  • DFT-S-OFDM Discrete Fourier Transform-Spread-OFDM
  • OFDM without Transform precoding or Transform precoding
  • Mode 3 and Mode 4 are defined for SL resource allocation to terminals 20 .
  • transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20 .
  • Mode 3 also allows SPS (Semi Persistent Scheduling).
  • SPS Semi Persistent Scheduling
  • the terminal 20 autonomously selects transmission resources from the resource pool.
  • a slot in the embodiment of the present invention may be read as a symbol, a mini-slot, a subframe, a radio frame, or a TTI (Transmission Time Interval).
  • the cell in the embodiment of the present invention may be read as cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), and the like.
  • the terminal 20 is not limited to a V2X terminal, and may be any type of terminal that performs D2D communication.
  • the terminal 20 may be a terminal owned by a user such as a smart phone, or may be an IoT (Internet of Things) device such as a smart meter.
  • IoT Internet of Things
  • FIG. 2 is a diagram for explaining an example (1) of the V2X transmission mode.
  • the base station 10 transmits sidelink scheduling to the terminal 20A.
  • terminal 20A transmits PSCCH (Physical Sidelink Control Channel) and PSSCH (Physical Sidelink Shared Channel) to terminal 20B based on the received scheduling (step 2).
  • the transmission mode of sidelink communication shown in FIG. 2 may be called sidelink transmission mode 3 in LTE.
  • sidelink transmission mode 3 in LTE Uu-based sidelink scheduling is performed.
  • Uu is a radio interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment).
  • the transmission mode of sidelink communication shown in FIG. 2 may be called sidelink transmission mode 1 in NR.
  • FIG. 3 is a diagram for explaining an example (2) of the V2X transmission mode.
  • the terminal 20A uses the autonomously selected resource to transmit PSCCH and PSSCH to the terminal 20B.
  • the transmission mode of sidelink communication shown in FIG. 3 may be called sidelink transmission mode 4 in LTE.
  • sidelink transmission mode 4 in LTE the UE itself performs resource selection.
  • FIG. 4 is a diagram for explaining an example (3) of the V2X transmission mode.
  • the terminal 20A uses the autonomously selected resource to transmit PSCCH and PSSCH to the terminal 20B.
  • terminal 20B uses the autonomously selected resource to transmit PSCCH and PSSCH to terminal 20A (step 1).
  • the transmission mode of sidelink communication shown in FIG. 4 may be referred to as sidelink transmission mode 2a in NR.
  • the terminal 20 In sidelink transmission mode 2 in NR, the terminal 20 itself performs resource selection.
  • FIG. 5 is a diagram for explaining an example (4) of the V2X transmission mode.
  • the sidelink resource pattern is transmitted from the base station 10 to the terminal 20A via RRC (Radio Resource Control) settings, or is set in advance.
  • terminal 20A transmits PSSCH to terminal 20B based on the resource pattern (step 1).
  • the transmission mode of sidelink communication shown in FIG. 5 may be referred to as sidelink transmission mode 2c in NR.
  • FIG. 6 is a diagram for explaining an example (5) of the V2X transmission mode.
  • the terminal 20A transmits sidelink scheduling to the terminal 20B via the PSCCH.
  • terminal 20B transmits PSSCH to terminal 20A based on the received scheduling (step 2).
  • the transmission mode of sidelink communication shown in FIG. 6 may be referred to as sidelink transmission mode 2d in NR.
  • FIG. 7 is a diagram for explaining an example (1) of the V2X communication type.
  • the sidelink communication type shown in FIG. 7 is unicast.
  • Terminal 20A transmits PSCCH and PSSCH to terminal 20 .
  • terminal 20A unicasts to terminal 20B and unicasts to terminal 20C.
  • FIG. 8 is a diagram for explaining an example (2) of the V2X communication type.
  • the sidelink communication type shown in FIG. 8 is groupcast.
  • Terminal 20A transmits PSCCH and PSSCH to the group to which one or more terminals 20 belong.
  • the group includes terminal 20B and terminal 20C, and terminal 20A performs a groupcast to the group.
  • FIG. 9 is a diagram for explaining an example (3) of the V2X communication type.
  • the sidelink communication type shown in FIG. 9 is broadcast.
  • Terminal 20A transmits PSCCH and PSSCH to one or more terminals 20 .
  • terminal 20A broadcasts to terminals 20B, 20C and 20D.
  • the terminal 20A shown in FIGS. 7 to 9 may be called a header-UE.
  • HARQ Hybrid automatic repeat request
  • SFCI Segmentlink Feedback Control Information
  • PSFCH Physical Sidelink Feedback Channel
  • the PSFCH is used for HARQ-ACK transmission on the sidelink, but this is just an example.
  • it may be to perform HARQ-ACK transmission on the sidelink using PSCCH, it may be to perform HARQ-ACK transmission on the sidelink using PSSCH, other channels It may be used to transmit HARQ-ACK on the sidelink.
  • HARQ-ACK all information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK.
  • This HARQ-ACK may be referred to as HARQ-ACK information.
  • a codebook applied to HARQ-ACK information reported from the terminal 20 to the base station 10 or the like is called a HARQ-ACK codebook.
  • the HARQ-ACK codebook defines bit sequences of HARQ-ACK information.
  • NACK is also transmitted by "HARQ-ACK".
  • FIG. 10 is a sequence diagram showing an operation example (1) of V2X.
  • the radio communication system according to the embodiment of the present invention may have terminal 20A and terminal 20B. Although there are actually many user devices, FIG. 10 shows the terminal 20A and the terminal 20B as an example.
  • terminal 20 when the terminals 20A, 20B, etc. are not particularly distinguished, they are simply referred to as "terminal 20" or "user device".
  • FIG. 10 shows a case where both terminal 20A and terminal 20B are within the coverage of the cell as an example, the operation in the embodiment of the present invention can also be applied when terminal 20B is out of the coverage.
  • the terminal 20 is, for example, a device mounted in a vehicle such as an automobile, and has a cellular communication function as a UE in LTE or NR and a side link function.
  • the terminal 20 may be a general mobile terminal (such as a smart phone).
  • the terminal 20 may be an RSU.
  • the RSU may be a UE type RSU having UE functionality, or a gNB type RSU having base station apparatus functionality.
  • the terminal 20 does not have to be a device in one housing.
  • the device including the various sensors may be the terminal 20 .
  • the processing content of the sidelink transmission data of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR.
  • the terminal 20 scrambles a codeword of transmission data, modulates it to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, the precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (eg complex-valued time-domain SC-FDMA signal) and transmit from each antenna port.
  • a transmission signal eg complex-valued time-domain SC-FDMA signal
  • the base station 10 has a function of cellular communication as a base station in LTE or NR, and a function (eg, resource pool setting, resource allocation, etc.) for enabling communication of the terminal 20 in the present embodiment. have.
  • the base station 10 may be an RSU (gNB type RSU).
  • the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveforms. may be
  • step S101 the terminal 20A autonomously selects resources to be used for PSCCH and PSSCH from a resource selection window having a predetermined period.
  • a resource selection window may be set from the base station 10 to the terminal 20 .
  • the period may be defined by the implementation conditions of the terminal such as the processing time or the maximum allowable packet delay time, or the period may be defined in advance by the specifications,
  • a predetermined period may be called an interval on the time domain.
  • the terminal 20A uses the resource autonomously selected in step S101 to transmit SCI (Sidelink Control Information) via PSCCH and/or PSSCH, and SL data via PSSCH.
  • SCI Servicelink Control Information
  • the terminal 20A may transmit the PSCCH using a frequency resource that is the same as at least part of the time resource of the PSSCH and that is adjacent to the frequency resource of the PSSCH.
  • the terminal 20B receives the SCI (PSCCH and/or PSSCH) and SL data (PSSCH) transmitted from the terminal 20A.
  • the received SCI may include PSFCH resource information for terminal 20B to transmit HARQ-ACK in response to reception of the data.
  • the terminal 20A may include the information of the autonomously selected resource in the SCI and transmit it.
  • step S104 the terminal 20B uses the PSFCH resource determined from the received SCI to transmit HARQ-ACK for the received data to the terminal 20A.
  • step S105 the terminal 20A retransmits the PSCCH and PSSCH to the terminal 20B when the HARQ-ACK received in step S104 indicates a request for retransmission, that is, when it is a NACK (negative acknowledgment).
  • the terminal 20A may retransmit the PSCCH and PSSCH using the autonomously selected resource.
  • steps S104 and S105 may not be performed when HARQ control accompanied by HARQ feedback is not performed.
  • FIG. 11 is a sequence diagram showing an operation example (2) of V2X. Blind retransmissions without HARQ control may be performed to improve transmission success rate or reach.
  • step S201 the terminal 20A autonomously selects resources to be used for PSCCH and PSSCH from a resource selection window having a predetermined period.
  • a resource selection window may be set from the base station 10 to the terminal 20 .
  • the terminal 20A uses the resources autonomously selected in step S201 to transmit SCI using the PSCCH and/or PSSCH, and transmit SL data using the PSSCH.
  • the terminal 20A may transmit the PSCCH using a frequency resource that is the same as at least part of the time resource of the PSSCH and that is adjacent to the frequency resource of the PSSCH.
  • step S204 the terminal 20A uses the resources autonomously selected in step S201 to retransmit the PSCCH and/or SCI by PSSCH and SL data by PSSCH to the terminal 20B.
  • the retransmission in step S204 may be performed multiple times.
  • step S204 may not be executed if blind retransmission is not executed.
  • FIG. 12 is a sequence diagram showing an operation example (3) of V2X.
  • the base station 10 may schedule sidelinks. That is, the base station 10 may determine the sidelink resources to be used by the terminal 20 and transmit information indicating the resources to the terminal 20 . Furthermore, when HARQ control with HARQ feedback is applied, base station 10 may transmit information indicating PSFCH resources to terminal 20 .
  • step S301 the base station 10 performs SL scheduling by sending DCI (Downlink Control Information) to the terminal 20A using the PDCCH.
  • DCI Downlink Control Information
  • SL scheduling DCI for convenience.
  • step S301 it is assumed that the base station 10 also transmits DCI for DL scheduling (which may be called DL allocation) to the terminal 20A using PDCCH.
  • DCI for DL scheduling is referred to as DL scheduling DCI for convenience.
  • the terminal 20A that has received the DL scheduling DCI receives DL data on the PDSCH using the resources specified by the DL scheduling DCI.
  • the terminal 20A uses the resources specified by the SL scheduling DCI to transmit SCI (Sidelink Control Information) using PSCCH and/or PSSCH, and transmit SL data using PSSCH.
  • SCI Segment Control Information
  • PSSCH Physical Broadcast Channel
  • the terminal 20A may transmit the PSCCH using the same time resources as at least part of the time resources of the PSSCH and using frequency resources adjacent to the frequency resources of the PSSCH.
  • the terminal 20B receives the SCI (PSCCH and/or PSSCH) and SL data (PSSCH) transmitted from the terminal 20A.
  • the SCI received by the PSCCH and/or PSSCH includes information on PSFCH resources for the terminal 20B to transmit HARQ-ACK in response to reception of the data.
  • Information on the resource is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the information on the resource from the DL scheduling DCI or SL scheduling DCI and transmits the SCI.
  • the DCI transmitted from the base station 10 may not contain the information on the resource, and the terminal 20A may autonomously include the information on the resource in the SCI and transmit it.
  • step S304 the terminal 20B uses the PSFCH resource determined from the received SCI to transmit HARQ-ACK for the received data to the terminal 20A.
  • the terminal 20A for example, at the timing (for example, slot unit timing) specified by the DL scheduling DCI (or SL scheduling DCI), the PUCCH specified by the DL scheduling DCI (or the SL scheduling DCI) ( Physical uplink control channel) resource is used to transmit HARQ-ACK, and the base station 10 receives the HARQ-ACK.
  • the HARQ-ACK codebook may include HARQ-ACKs generated based on HARQ-ACKs received from terminal 20B or PSFCHs not received, and HARQ-ACKs for DL data. However, HARQ-ACK for DL data is not included, such as when there is no DL data allocation. NR Rel. In 16, the HARQ-ACK codebook does not include HARQ-ACK for DL data.
  • step S304 and/or step S305 may not be performed.
  • FIG. 13 is a sequence diagram showing an operation example (4) of V2X.
  • the HARQ response is transmitted on the PSFCH.
  • the format of PSFCH a format similar to PUCCH (Physical Uplink Control Channel) format 0, for example, can be used. That is, the PSFCH format may be a sequence-based format in which the PRB (Physical Resource Block) size is 1, and ACK and NACK are identified by sequence and/or cyclic shift differences.
  • the PSFCH format is not limited to this.
  • the PSFCH resource may be placed in the last symbol or multiple last symbols of the slot.
  • the period N is set or defined in advance for the PSFCH resource. The period N may be set or predefined in slot units.
  • the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain.
  • the PSCCH may be arranged in one symbol at the beginning of the slot, may be arranged in a plurality of symbols from the beginning, or may be arranged in a plurality of symbols from symbols other than the beginning.
  • the PSFCH may be arranged in one symbol at the end of the slot, or may be arranged in multiple symbols at the end of the slot. It should be noted that the above-mentioned "slot head” and "slot end” may omit consideration of symbols for AGC (Automatic Gain Control) and symbols for transmission/reception switching.
  • AGC Automatic Gain Control
  • slot end refers to the symbols at the beginning and end of the 12 symbols excluding the symbols at the beginning and end, respectively.
  • FIG. 13 three subchannels are set in the resource pool, and two PSFCHs are arranged three slots after the slot in which the PSSCH is arranged. Arrows from PSSCH to PSFCH show examples of PSFCH associated with the PSSCH.
  • step S401 the terminal 20A, which is the transmitting terminal 20, performs a group cast to the terminals 20B, 20C, and 20D, which are the receiving terminals 20, via SL-SCH.
  • step S402 terminal 20B uses PSFCH#B, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D to transmit a HARQ response to terminal 20A.
  • terminal 20B uses PSFCH#B
  • terminal 20C uses PSFCH#C
  • terminal 20D uses PSFCH#D to transmit a HARQ response to terminal 20A.
  • the transmitting terminal 20 may be aware of the number of receiving terminals 20 in the group cast. Note that in groupcast option 1, only NACK is transmitted as the HARQ response, and ACK is not transmitted.
  • FIG. 14 is a diagram showing an example of sensing operation in NR.
  • the terminal 20 selects resources and performs transmission. As shown in FIG. 14, the terminal 20 performs sensing in sensing windows within the resource pool. By sensing, the terminal 20 receives a resource reservation field or a resource assignment field included in the SCI transmitted from another terminal 20, based on the field, resource selection in the resource pool Identify available resource candidates within a window (resource selection window). Subsequently, the terminal 20 randomly selects resources from available resource candidates.
  • resource pool configuration may have a periodicity.
  • the period may be a period of 10240 milliseconds.
  • FIG. 14 is an example in which slots from slot t 0 SL to slot t Tmax-1 SL are set as a resource pool.
  • the resource pool within each period may be defined by, for example, a bitmap.
  • the transmission trigger in terminal 20 occurs at slot n, and the priority of the transmission is p TX .
  • the terminal 20 can detect, for example, that another terminal 20 is transmitting with priority p RX in the sensing window from slot nT 0 to the slot immediately preceding slot nT proc,0 . . If SCI is detected within the sensing window and RSRP (Reference Signal Received Power) exceeds a threshold, resources within the resource selection window corresponding to the SCI are excluded. Also, if an SCI is detected within the sensing window and the RSRP is less than the threshold, the resource within the resource selection window corresponding to the SCI is not excluded.
  • the thresholds may be, for example, thresholds Th pTX, pRX that are set or defined for each resource within the sensing window based on the priority pTX and the priority pRX .
  • resources within the resource selection window that are candidates for resource reservation information corresponding to resources within the sensing window that were not monitored, eg, for transmission, are excluded, such as slot t m SL shown in FIG.
  • S A be a set of available resource candidates, and if S A is less than 20% of the resource selection window, the thresholds Th pTX and pRX set for each resource in the sensing window are increased by 3 dB, and the resource selection is performed again. Identification may be performed. That is, by increasing the thresholds Th pTX and pRX and executing resource identification again, the resources that are not excluded because the RSRP is less than the threshold are increased, and the set S A of resource candidates reaches 20% or more of the resource selection window. You can make it If S A is less than 20% of the resource selection window, the operation of increasing the thresholds Th pTX, pRX set for each resource in the sensing window by 3 dB and performing resource identification again may be repeated.
  • the lower layers of terminal 20 may report the SA to higher layers. Higher layers of terminal 20 may perform a random selection on SA to determine which resource to use. The terminal 20 may perform sidelink transmission using the determined resource.
  • the transmitting terminal 20 detects data transmission from another terminal 20 based on the result of sensing or partial sensing, and 20 may receive data.
  • FIG. 15 is a flow chart showing an example of preemption in NR.
  • FIG. 16 is a diagram showing an example of preemption in NR.
  • the terminal 20 performs sensing in the sensing window. When the terminal 20 performs power saving operation, sensing may be performed in a predetermined limited period. Subsequently, the terminal 20 identifies each resource within the resource selection window based on the sensing result, determines a resource candidate set SA , and selects resources to be used for transmission (S502). Subsequently, the terminal 20 selects a resource set (r_0, r_1, . . . ) for judging preemption from the resource candidate set SA (S503). The resource set may be notified from the upper layer to the PHY layer as a resource for determining whether or not it has been preempted.
  • step S504 the terminal 20 re-identifies each resource within the resource selection window based on the sensing result at the timing of T ( r_0)-T3 shown in FIG. 16 to determine the set S A of resource candidates. , and determine preemption for resource sets (r_0, r_1, . . . ) based on priority. For example, in r_1 shown in FIG. 16, the SCI transmitted from the other terminal 20 is detected by re-sensing and is not included in SA . When preemption is enabled, if the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is lower than the value prio_TX indicating the priority of the transport block transmitted from the terminal 20, the terminal 20 uses the resource r_1.
  • preemption has occurred. Note that the lower the priority value, the higher the priority. That is, when the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is higher than the value prio_TX indicating the priority of the transport block transmitted from the terminal 20, the terminal 20 does not exclude resource r_1 from SA. . Or, if preemption is valid only for a specific priority (for example, sl-PreemptionEnable is any of pl1, pl2, ..., pl8), let this priority be prio_pre.
  • Terminal 20 determines that resource r_1 is preempted.
  • step S505 when preemption is determined in step S504, the terminal 20 notifies the upper layer of preemption, reselects resources in the upper layer, and ends the preemption check.
  • step S504 when re-evaluation is performed instead of checking preemption, in step S504, after determining the set S A of resource candidates, the resource set (r_0, r_1, . . . ) is set to S A. If the resource is not included, the resource is not used and the upper layer reselects the resource.
  • FIG. 17 is a diagram showing an example of partial sensing operation in LTE.
  • the terminal 20 selects resources and performs transmission as shown in FIG.
  • the terminal 20 performs partial sensing on a part of the sensing window in the resource pool, that is, the sensing targets.
  • a terminal 20 receives resource reservation fields included in SCIs transmitted from other terminals 20, and based on the field, identifies available resource candidates within a resource selection window within a resource pool. . Subsequently, the terminal 20 randomly selects resources from available resource candidates.
  • FIG. 17 is an example in which subframe t 0 SL to subframe t Tmax ⁇ 1 SL are set as a resource pool.
  • a resource pool may have a target area set by, for example, a bitmap.
  • the transmission trigger in terminal 20 occurs in subframe n.
  • Y subframes from subframe t y1 SL to subframe t yY SL in subframe n+T 1 to subframe n+T 2 may be set as the resource selection window.
  • Terminal 20 is transmitting in one or a plurality of sensing targets from subframe t y1 ⁇ k ⁇ Pstep SL having a length of Y subframes to subframe t yY ⁇ k ⁇ Pstep SL .
  • k may be determined by a 10-bit bitmap, for example.
  • FIG. 17 shows an example in which the 3rd and 6th bits of the bitmap are set to "1" indicating that partial sensing is to be performed. That is, in FIG. 17, from subframe t y1 ⁇ 6 ⁇ Pstep SL to subframe t yY ⁇ 6 ⁇ Pstep SL and from subframe t y1 ⁇ 3 ⁇ Pstep SL to subframe t yY ⁇ 3 ⁇ Pstep SL .
  • the kth bit of the bitmap may correspond to the sensing window from subframe t y1 ⁇ k ⁇ Pstep SL to subframe t yY ⁇ k ⁇ Pstep SL .
  • y i corresponds to the index (1...Y) within the Y subframe.
  • k may be set by a 10-bit bitmap or defined in advance, and P step may be 100 ms.
  • P step may be (U/(D+S+U))*100ms.
  • U corresponds to the number of UL subframes
  • D corresponds to the number of DL subframes
  • S corresponds to the number of special subframes.
  • the thresholds may be, for example, thresholds Th pTX, pRX that are set or defined for each resource in the sensing target based on the transmitter priority p TX and the receiver priority p RX .
  • terminal 20 identifies resources occupied by other UEs in the resource selection window set in Y subframes in interval [n+T 1 , n+T 2 ], and selects resources excluding those resources. are available resource candidates. Note that the Y subframes do not have to be continuous.
  • S A be a set of available resource candidates, and if S A is less than 20% of the resources in the resource selection window, the thresholds Th pTX, pRX set for each resource of the sensing target are increased by 3 dB and again Resource identification may be performed.
  • the resources that are not excluded because the RSRP is less than the thresholds may be increased. Further, the RSSI of each resource in S A may be measured and the resource with the lowest RSSI may be added to the set S B . The operation of adding the resource with the smallest RSSI included in S A to S B may be repeated until the set S B of resource candidates is equal to or greater than 20% of the resource selection window.
  • the lower layers of terminal 20 may report the SB to higher layers. Higher layers in terminal 20 may perform a random selection on S B to determine which resource to use. The terminal 20 may perform sidelink transmission using the determined resource. Note that the terminal 20 may periodically use the resource without performing sensing for a predetermined number of times (for example, C resel times) after securing the resource once.
  • a predetermined number of times for example, C resel times
  • random resource selection and fractional sensing for sidelinks in LTE Release-14 may be applied to resource allocation mode 2 for NR Release-16 sidelinks for power saving.
  • a terminal 20 to which partial sensing is applied performs reception and sensing only in a specific slot within the sensing window.
  • eURLLC enhanced Ultra Reliable Low Latency Communication
  • terminal 20A may share information indicating resource sets with terminal 20B, and terminal 20B may consider this information in resource selection for transmission.
  • the terminal 20 may perform full sensing as shown in FIG. 14 as a resource allocation method in the sidelink. Also, the terminal 20 may perform partial sensing in which resource identification is performed by sensing only limited resources compared to full sensing, and resource selection is performed from the identified resource set. In addition, the terminal 20 sets the resource within the resource selection window as the identified resource set without excluding the resource from the resources within the resource selection window, and performs random selection for selecting the resource from the identified resource set. You may
  • a method of performing random selection at the time of resource selection and using sensing information at the time of re-evaluation or preemption check may be treated as partial sensing or random selection.
  • Periodic-based partial sensing An operation of determining a sensing slot based on a reservation periodicity in a scheme in which sensing is performed only in some slots. Note that the reservation period is a value associated with the resource reservation period field.
  • the operation may be defined by assuming three types of terminals 20.
  • One is type A, where type A terminals 20 do not have the ability to receive any sidelink signals and channels.
  • receiving PSFCH and S-SSB may be an exception.
  • the other is type B, where type B terminals 20 do not have the ability to receive any sidelink signals and channels except PSFCH and S-SSB reception.
  • the other is type D, where type D terminals 20 have the ability to receive all sidelink signals and channels defined in Release 16. However, it does not preclude receiving some sidelink signals and channels.
  • UE types other than the above types A, B, and D may be assumed, and UE types and UE capabilities may or may not be associated.
  • SL-DRX discontinuous reception
  • the receiving operation is performed only during a predetermined time period.
  • resource reservation information of other terminals 20 is received by sensing, and terminal 20 selects resources to be used for transmission based on the resource reservation information.
  • resource collision may occur.
  • FIG. 18 is a diagram showing an example (1) of communication status.
  • a terminal 20B when a terminal 20B tries to transmit to a terminal 20A, a terminal 20C that cannot be detected by the terminal 20B exists in a position that interferes with the receiving terminal 20A. There is for example, if terminal 20C transmits in time/frequency resources reserved by terminal 20B, resource overlap occurs when terminal 20A receives.
  • Half-duplex communication is also one of the subjects to consider. If the side link is half-duplex communication, for example, if both terminals 20 simultaneously transmit reservation signals, there is a possibility that reserved resources will collide.
  • FIG. 19 is a diagram showing an example (2) of communication status.
  • terminal 20B which is detected at low power in transmitting terminal 20C, causes large interference to receiving terminal 20A. It may be present at the given position.
  • FIG. 20 is a diagram showing an example (3) of communication status.
  • transmission resources and transmission resource collisions in the time domain may overlap at the terminal 20A. Drops or power reductions occur when multiple transmissions overlap.
  • PSFCH and PSFCH overlap shown in FIG. 20 or the PSFCH and UL channel overlap, or the like occurs.
  • FIG. 21 is a diagram for explaining example (4) of the communication status. As an example of collision between transmission resources and reception resources in the time domain, as shown in FIG. may overlap.
  • FIG. 22 is a diagram for explaining example (5) of the communication status. As an example of collision between transmission resources and reception resources in the time domain, as shown in FIG. may overlap at the terminal 20A.
  • Inter-terminal cooperation is being considered as a method to improve reliability and delay performance.
  • Type A, Type B and Type C shown below are being considered. Note that the names and classifications are not limited to these.
  • the terminal 20A may notify the terminal 20B of the resource set preferred for transmission of the terminal 20B.
  • the notification may be based on sensing results in the terminal 20A.
  • the terminal 20A may notify the terminal 20B of resource sets that are not preferred for the transmission of the terminal 20B.
  • the notification may be based on sensing results at the terminal 20A, or may be based on expected or potential resource collisions.
  • the terminal 20A may notify the terminal 20B of the resource set in which the resource collision was detected. For example, the notification may be based on previously detected resource conflicts.
  • the following methods 1) to 6) may be determined.
  • the terminal 20A detects a resource collision in the past transmission of the terminal 20B, the terminal 20A transmits a predetermined notification to the terminal 20B by a predetermined method, and the terminal 20B performs a predetermined operation based on the notification.
  • the terminal 20 may perform a different operation than when no resource collision is detected.
  • the terminal 20 may perform HARQ feedback on data transmitted by broadcast.
  • the terminal 20 may perform HARQ feedback for transmissions for which the cast type could not be detected.
  • FIG. 23 is a sequence diagram for explaining an example of inter-UE cooperation according to the embodiment of the present invention.
  • the terminal 20A detects a collision in the past transmissions of the terminal 20B.
  • terminal 20A transmits a predetermined notification to terminal 20B by a predetermined method.
  • the terminal 20B executes a predetermined operation based on the predetermined notification.
  • the terminal 20 can appropriately perform retransmission after resource collision occurs. That is, reliability can be improved.
  • the HARQ-ACK or HARQ feedback in the embodiments of the present invention may be replaced by predetermined notification or transmission of predetermined notification, respectively.
  • a terminal 20A, a terminal 20B, and a terminal 20C are present, and the terminal 20B and the terminal 20C transmit the PSSCH to the terminal 20A or another terminal 20.
  • FIG. 1 A terminal 20A, a terminal 20B, and a terminal 20C are present, and the terminal 20B and the terminal 20C transmit the PSSCH to the terminal 20A or another terminal 20.
  • FIG. 1 A terminal 20A, a terminal 20B, and a terminal 20C are present, and the terminal 20B and the terminal 20C transmit the PSSCH to the terminal 20A or another terminal 20.
  • the terminal 20A receives predetermined information from the terminal 20B.
  • the predetermined information may be information related to RRC connection.
  • the PC5-RRC connection is established in advance between the terminal 20A and the terminal 20B, and the operation according to the present embodiment is applicable, that is, when the corresponding UE capability is supported. good too.
  • the applicability of the operation according to the present embodiment is notified by a signal related to the resource reservation (for example, 1st stage SCI in PSCCH, 2nd stage SCI in PSSCH).
  • terminal 20A determines that resource collision is detected only when predetermined information is received from terminal 20B, so that information transmitted from terminal 20A to terminal 20B is not wasted at terminal 20B. can be used without
  • terminal 20A when terminal 20A detects a resource collision for data transmitted from terminal 20B with group cast option 1, terminal 20A may perform a different operation than when no resource collision is detected.
  • the terminal 20A may transmit NACK to the terminal 20B using the corresponding resource.
  • a resource different from the PSFCH resource in the case of no resource collision that is, the PSFCH resource defined in Release 16
  • the terminal 20A may transmit NACK using the different resource.
  • the PSFCH resource in the case of no resource collision and the time resource of the different resource may be the same. That is, the time resources of the different resources may be determined based on the higher layer parameter sl-MinTimeGapPSFCH. Also, for example, a frequency resource set different from the frequency resource set given by the higher layer parameter sl-PSFCH-RBSet-r16 may be used for the different resource.
  • the different resource determination method may be the same as the PSFCH resource determination method defined in Release 16. That is, each PSSCH resource may be associated with the different frequency resource sets, and for a given PSSCH reception, the corresponding different resources may be determined based on the UE-ID and cast type.
  • different resource determination methods may be used for the different resources.
  • the association between the PSSCH resource and the PSFCH resource may be the same, and the parameter M_ID used for resource determination may be set to a value other than 0 (eg, 1).
  • a NACK may be transmitted using the same resources as the PSFCH resources in the case of no resource collision.
  • terminal 20A uses the different resource to send NACK-only feedback to terminal 20B. good too. That is, the terminal 20A transmits a NACK to the terminal 20B only when reception or decoding of data transmitted by the groupcast option 1 fails, and when the data reception or decoding succeeds, the terminal 20A responds to the corresponding HARQ- ACK need not be sent.
  • the PSFCH resource in the case of no resource collision and the time resource of the different resource may be the same. That is, the time resources of the different resources may be determined based on the higher layer parameter sl-MinTimeGapPSFCH. Also, for example, a frequency resource set different from the frequency resource set given by the higher layer parameter sl-PSFCH-RBSet-r16 may be used for the different resource.
  • the different resource determination method may be the same as the PSFCH resource determination method defined in Release 16. That is, each PSSCH resource may be associated with the different frequency resource sets, and for a given PSSCH reception, the corresponding different resources may be determined based on the UE-ID and cast type.
  • different resource determination methods may be used for the different resources.
  • the association between the PSSCH resource and the PSFCH resource may be the same, and the parameter M_ID used for resource determination may be set to a value other than 0 (eg, 1).
  • a NACK may be transmitted using the same resources as the PSFCH resources in the case of no resource collision.
  • the terminal 20B that has received the above NACK may retransmit the transport block.
  • the terminal 20A may perform HARQ feedback on the data transmitted from the terminal 20B by broadcast.
  • M_ID may be determined in a predetermined manner by the same determination method as unicast or groupcast.
  • M_ID may be determined based on the UE-ID of the own device.
  • M_ID may be a common ID (for example, 0) between terminals 20 .
  • a resource different from the PSFCH resource for unicast or group cast (that is, the PSFCH resource defined in Release 16) is defined, and the terminal 20A uses the different resource for data transmitted by broadcast. may send a HARQ-ACK.
  • the PSFCH resource in the case of no resource collision and the time resource of the different resource may be the same. That is, the time resources of the different resources may be determined based on the higher layer parameter sl-MinTimeGapPSFCH. Also, for example, a frequency resource set different from the frequency resource set given by the higher layer parameter sl-PSFCH-RBSet-r16 may be used for the different resource. Also, for example, in a frequency resource set different from the frequency resource set given by the higher layer parameter sl-PSFCH-RBSet-r16, at this time, in the different frequency resource set, the different resource determination method is defined in Release 16. It may be the same as the determination method of the PSFCH resource provided. That is, each PSSCH resource may be associated with the different frequency resource sets, and for a given PSSCH reception, the corresponding different resources may be determined based on the UE-ID and cast type.
  • the terminal 20A may perform ACK/NACK feedback. Also, when transmitting HARQ-ACK for data transmitted by broadcast, the terminal 20A may feed back only NACK. When transmitting HARQ-ACK for data transmitted by broadcast, the terminal 20A may perform HARQ feedback when no resource collision is detected.
  • the terminal 20A may transmit HARQ-ACK in response to data transmitted by broadcast. Also, the terminal 20A may transmit HARQ-ACK for data transmitted by broadcasting only when the power of the signal received by the terminal 20A from the terminal 20B exceeds a predetermined value.
  • the terminal 20B that has received the above NACK may retransmit the transport block.
  • the HARQ feedback from the terminal 20A allows the terminal 20B to recognize that retransmission is necessary, even if it is a broadcast, improving reliability.
  • the terminal 20A may perform HARQ feedback for the transmission of the terminal 20B for which the cast type could not be detected.
  • the transmission in which the cast type could not be detected may be transmission in which reception and decoding of the 1st stage SCI are successful, but reception and decoding of the 2nd stage SCI are unsuccessful.
  • HARQ feedback for transmissions for which the cast type could not be detected may be performed similarly to HARQ feedback for broadcasts described above.
  • the terminal 20B that has received the above HARQ feedback may retransmit the transport block.
  • the terminal 20B can recognize that retransmission is necessary. can.
  • the above embodiments are not limited to V2X terminals, and may be applied to terminals that perform D2D communication.
  • the operations according to the above embodiment may be executed only in a specific resource pool. For example, it may be executed only in resource pools that terminals 20 of release 17 or later can use.
  • the terminal 20 can detect that the past transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to resource collision.
  • the other terminal 20 can appropriately control the transmission operation based on the notified resource collision information.
  • the base stations 10 and terminals 20 contain the functionality to implement the embodiments described above. However, each of the base station 10 and terminal 20 may have only part of the functions in the embodiment.
  • FIG. 24 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 24, the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140.
  • the functional configuration shown in FIG. 24 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals.
  • the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DL reference signals, etc. to the terminal 20 .
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads them from the storage device as necessary.
  • the content of the setting information is, for example, information related to setting of D2D communication.
  • the control unit 140 performs processing related to setting for the terminal 20 to perform D2D communication, as described in the embodiment. Also, the control unit 140 transmits scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110 . Also, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the receiving unit 120 .
  • a functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 .
  • FIG. 25 is a diagram showing an example of the functional configuration of the terminal 20.
  • the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240.
  • the functional configuration shown in FIG. 25 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal.
  • the receiving unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, reference signals, etc. transmitted from the base station 10 .
  • the transmission unit 210 as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) etc.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in the storage device, and reads them from the storage device as necessary.
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, information related to setting of D2D communication.
  • the control unit 240 controls D2D communication that establishes an RRC connection with another terminal 20, as described in the embodiment. In addition, the control unit 240 performs processing related to power saving operation. In addition, the control unit 240 performs processing related to HARQ for D2D communication and DL communication. Also, the control unit 240 transmits to the base station 10 information related to HARQ responses of D2D communication and DL communication scheduled from the base station 10 to other terminals 20 . The control unit 240 may also schedule D2D communication for other terminals 20 . In addition, the control unit 240 may autonomously select resources to be used for D2D communication from a resource selection window based on sensing results, or may perform re-evaluation or preemption.
  • control unit 240 performs processing related to power saving in transmission and reception of D2D communication. In addition, the control unit 240 performs processing related to inter-terminal cooperation in D2D communication.
  • a functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210 , and a functional unit related to signal reception in control unit 240 may be included in receiving unit 220 .
  • each functional block may be realized using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separated devices (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
  • a functional block may be implemented by combining software in the one device or the plurality of devices.
  • Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
  • a functional block (component) that performs transmission is called a transmitting unit or transmitter.
  • the implementation method is not particularly limited.
  • the base station 10, the terminal 20, etc. may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • FIG. 26 is a diagram illustrating an example of a hardware configuration of base station 10 and terminal 20 according to an embodiment of the present disclosure.
  • the base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.
  • the term "apparatus” can be read as a circuit, device, unit, or the like.
  • the hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
  • Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .
  • the processor 1001 for example, operates an operating system and controls the entire computer.
  • the processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
  • CPU central processing unit
  • the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .
  • the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them.
  • programs program codes
  • software modules software modules
  • data etc.
  • the program a program that causes a computer to execute at least part of the operations described in the above embodiments is used.
  • control unit 140 of base station 10 shown in FIG. 24 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 .
  • the control unit 240 of the terminal 20 shown in FIG. 25 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001.
  • FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.
  • the storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured.
  • the storage device 1002 may also be called a register, cache, main memory (main storage device), or the like.
  • the storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
  • the storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .
  • the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • the transceiver may be physically or logically separate implementations for the transmitter and receiver.
  • the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
  • the output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
  • the base station 10 and the terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware.
  • processor 1001 may be implemented using at least one of these pieces of hardware.
  • a receiving unit that receives a signal from another terminal in a resource in a resource pool, and a control unit that detects at least one of decoding failure and resource collision in the resource and a transmission unit that transmits a signal related to at least one of decoding failure and resource collision to the other terminal when the control unit detects at least one of decoding failure and resource collision in the resource, and the decoding Signaling of failures and/or resource collisions is provided to the terminal including Hybrid automatic repeat request (HARQ) feedback.
  • HARQ Hybrid automatic repeat request
  • the terminal 20 can detect that the past transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to resource collision.
  • the other terminal 20 can appropriately control the transmission operation based on the notified resource collision information. That is, in direct communication between terminals, the reliability of communication at the time of autonomous resource selection can be improved.
  • the transmission of the other terminal in the resource may be groupcast.
  • the terminal 20 can detect that past groupcast transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to the resource collision.
  • the transmitting unit transmits a signal related to at least one of the decoding failure and resource collision including a negative response to another terminal. You may send.
  • the terminal 20 can detect that past transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to the resource collision.
  • the transmission of the other terminal in the resource may be broadcast.
  • the terminal 20 can detect that the past broadcast transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to the resource collision.
  • the transmitting unit may transmit a signal related to at least one of the decoding failure and resource collision to the other terminal.
  • the terminal 20 can detect that past transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to the resource collision.
  • a reception procedure for receiving a signal from another terminal in a resource in a resource pool a control procedure for detecting at least one of decoding failure and resource collision in the resource, and and a transmission procedure for transmitting a signal related to at least one of decoding failure and resource collision to the other terminal when at least one of decoding failure and resource collision is detected, and at least one of said decoding failure and resource collision.
  • Signaling is provided in communication methods including HARQ (Hybrid automatic repeat request) feedback.
  • the terminal 20 can detect that the past transmissions of other terminals 20 have collided, and notify the other terminals 20 of information related to resource collision.
  • the other terminal 20 can appropriately control the transmission operation based on the notified resource collision information. That is, in direct communication between terminals, the reliability of communication at the time of autonomous resource selection can be improved.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof.
  • the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.
  • notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
  • notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system) system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).
  • a specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases.
  • various operations performed for communication with terminal 20 may be performed by base station 10 and other network nodes other than base station 10 (eg, but not limited to MME or S-GW).
  • base station 10 e.g, but not limited to MME or S-GW
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
  • Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.
  • the determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
  • the channel and/or symbols may be signaling.
  • a signal may also be a message.
  • a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
  • radio resources may be indexed.
  • base station BS
  • radio base station base station
  • base station fixed station
  • NodeB nodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • a base station can accommodate one or more (eg, three) cells.
  • the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH:
  • RRH indoor small base station
  • the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage.
  • MS Mobile Station
  • UE User Equipment
  • a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
  • the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
  • at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
  • at least one of the base station and mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read as a user terminal.
  • communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.)
  • the terminal 20 may have the functions of the base station 10 described above.
  • words such as "up” and “down” may be replaced with words corresponding to inter-terminal communication (for example, "side”).
  • uplink channels, downlink channels, etc. may be read as side channels.
  • user terminals in the present disclosure may be read as base stations.
  • the base station may have the functions that the above-described user terminal has.
  • determining and “determining” used in this disclosure may encompass a wide variety of actions.
  • “Judgement” and “determination” are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as “judged” or “determined”, and the like.
  • "judgment” and “determination” are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment” or “decision” has been made.
  • judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
  • judgment and “decision” may include considering that some action is “judgment” and “decision”.
  • judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
  • connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
  • two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.
  • RS Reference Signal
  • any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.
  • a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.
  • a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • SCS subcarrier spacing
  • TTI transmission time interval
  • transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • a slot may consist of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
  • a slot may be a unit of time based on numerology.
  • a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
  • PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A.
  • PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
  • Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
  • one subframe may be called a Transmission Time Interval (TTI)
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • one slot or one minislot may be called a TTI.
  • TTI Transmission Time Interval
  • at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum scheduling time unit in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis.
  • radio resources frequency bandwidth, transmission power, etc. that can be used by each terminal 20
  • TTI is not limited to this.
  • a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
  • one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
  • a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
  • the short TTI e.g., shortened TTI, etc.
  • a TTI having the above TTI length may be read instead.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
  • the number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example.
  • the number of subcarriers included in an RB may be determined based on numerology.
  • the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
  • One TTI, one subframe, etc. may each consist of one or more resource blocks.
  • One or more RBs are physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. may be called.
  • PRBs physical resource blocks
  • SCGs sub-carrier groups
  • REGs resource element groups
  • PRB pairs RB pairs, etc. may be called.
  • a resource block may be composed of one or more resource elements (RE: Resource Element).
  • RE Resource Element
  • 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • a bandwidth part (which may also be called a bandwidth part) may represent a subset of contiguous common resource blocks (RBs) for a certain numerology on a certain carrier.
  • the common RB may be identified by an RB index based on the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or more BWPs may be configured for terminal 20 within one carrier.
  • At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a given signal/channel outside the active BWP.
  • “cell”, “carrier”, etc. in the present disclosure may be read as "BWP”.
  • radio frames, subframes, slots, minislots and symbols described above are only examples.
  • the number of subframes contained in a radio frame the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.
  • CP cyclic prefix
  • a and B are different may mean “A and B are different from each other.”
  • the term may also mean that "A and B are different from C”.
  • Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
  • notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
  • base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

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

Abstract

La présente invention concerne un terminal comprenant un récepteur qui reçoit un signal d'un autre terminal en utilisant une ressource dans un groupe de ressources, un dispositif de commande qui détecte un échec de décodage et/ou une collision de ressources dans la ressource, et un émetteur qui transmet un signal associé à l'échec de décodage et/ou à la collision de ressource à l'autre terminal lorsque le dispositif de commande détecte l'échec de décodage et/ou la collision de ressource dans la ressource, le signal relatif à l'échec de décodage et/ou à la collision de ressource comprenant un retour de demande de répétition automatique hybride (HARQ).
PCT/JP2021/015363 2021-04-13 2021-04-13 Terminal et procédé de communication WO2022219728A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2021/015363 WO2022219728A1 (fr) 2021-04-13 2021-04-13 Terminal et procédé de communication

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Application Number Priority Date Filing Date Title
PCT/JP2021/015363 WO2022219728A1 (fr) 2021-04-13 2021-04-13 Terminal et procédé de communication

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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
LG ELECTRONICS: "Discussion on inter-UE coordination for Mode 2 enhancements", 3GPP DRAFT; R1-2103379, vol. RAN WG1, 7 April 2021 (2021-04-07), pages 1 - 24, XP052178122 *
PANASONIC: "Inter-UE coordination for Mode 2 enhancements", 3GPP DRAFT; R1-2103605, vol. RAN WG1, 6 April 2021 (2021-04-06), pages 1 - 8, XP051993444 *
QUALCOMM INCORPORATED: "Reliability and Latency Enhancements for Mode 2", 3GPP DRAFT; R1-2103185, vol. RAN WG1, 7 April 2021 (2021-04-07), pages 1 - 17, XP052177984 *

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