WO2024171453A1 - 端末及び無線通信方法 - Google Patents

端末及び無線通信方法 Download PDF

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Publication number
WO2024171453A1
WO2024171453A1 PCT/JP2023/005805 JP2023005805W WO2024171453A1 WO 2024171453 A1 WO2024171453 A1 WO 2024171453A1 JP 2023005805 W JP2023005805 W JP 2023005805W WO 2024171453 A1 WO2024171453 A1 WO 2024171453A1
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Prior art keywords
terminal
psfch
sidelink
resource
channel
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English (en)
French (fr)
Japanese (ja)
Inventor
翔平 吉岡
太一 七條
聡 永田
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to PCT/JP2023/005805 priority Critical patent/WO2024171453A1/ja
Priority to JP2025500602A priority patent/JPWO2024171453A1/ja
Publication of WO2024171453A1 publication Critical patent/WO2024171453A1/ja
Anticipated expiration legal-status Critical
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    • 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

  • This disclosure relates to a terminal and a wireless communication method that support communication on a sidelink channel.
  • Non-Patent Document 1 For LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced) and NR (New Radio) (also known as 5G)), D2D (Device to Device) technology is being considered, which allows terminals to communicate directly with each other without going through a base station (e.g., Non-Patent Document 1).
  • LTE-A Long Term Evolution Advanced
  • NR New Radio
  • 5G New Radio
  • D2D reduces traffic between terminals and base stations, and enables communication between terminals even if the base station becomes unable to communicate due to a disaster or other reason.
  • 3GPP registered trademark
  • 3rd Generation Partnership Project refers to D2D as "sidelink,” but in this specification, the more general term D2D is used. However, in the explanation of the embodiments described later, sidelink will also be used as necessary.
  • D2D communication is broadly divided into D2D discovery (also called D2D discovery) for discovering other terminals with which it can communicate, and D2D communication (also called D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between terminals.
  • D2D discovery also called D2D discovery
  • D2D communication also called D2D direct communication, D2D communication, direct communication between terminals, etc.
  • D2D signals transmitted and received in D2D will be referred to as D2D signals.
  • Various use cases for services related to V2X (Vehicle to Everything) in NR are being considered (for example, Non-Patent Document 2).
  • Non-Patent Document 3 the use of higher frequency bands than in previous releases is being considered.
  • applicable numerology including subcarrier spacing and channel bandwidth in the frequency band from 52.6 GHz to 71 GHz, physical layer design, and anticipated interference in actual wireless communications are being considered.
  • 3GPP TS 38.211 V17.3.0 (2022-09) 3GPP TR 22.886 V16.2.0 (2018-12) 3GPP TS 38.306 V17.2.0 (2022-09) 3GPP TS 37.213 V17.3.0 (2022-09)
  • PSFCH Physical Sidelink Feedback Channel
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • the present disclosure has been made to solve the above-mentioned problems, and aims to provide a terminal and a wireless communication method that can appropriately transmit a sidelink channel (PSCCH/PSSCH/PSFCH) in cases where two or more PSFCH occasions are available for a certain PSCCH/PSSCH.
  • PSCCH/PSSCH/PSFCH sidelink channel
  • One aspect of the disclosure is a terminal that includes a communication unit that executes communication on a sidelink channel and a control unit that controls the communication on the sidelink channel, and the control unit controls the transmission of the sidelink channel in a specific manner when two or more transmission opportunities are available as transmission opportunities on a sidelink feedback channel that transmits feedback.
  • One aspect of the disclosure is a wireless communication method comprising step A of performing communication on a sidelink channel and step B of controlling the communication on the sidelink channel, the step A including a step of controlling the transmission of the sidelink channel in a specific manner when two or more transmission opportunities are available as transmission opportunities on a sidelink feedback channel for transmitting feedback.
  • FIG. 1 is a diagram for explaining V2X.
  • FIG. 1 is a sequence diagram showing an example of V2X operation (1).
  • FIG. 1 is a sequence diagram showing an example of V2X operation (2).
  • FIG. 1 is a sequence diagram showing an example of V2X operation (3).
  • FIG. 11 is a sequence diagram showing an example of V2X operation (4).
  • FIG. 11 is a diagram illustrating an example of a sensing operation.
  • 11 is a flowchart illustrating an example of a preemption operation.
  • FIG. 13 illustrates an example of a preemption operation.
  • FIG. 13 is a diagram illustrating an example of a partial sensing operation.
  • FIG. 13 is a diagram for explaining an example of periodic partial sensing.
  • FIG. 13 is a diagram for explaining an example of continuous partial sensing.
  • FIG. 4 is a diagram illustrating an example of a frequency range in an embodiment.
  • FIG. 1 is a diagram for explaining an example of LBT (1).
  • FIG. 13 is a diagram for explaining an example (2) of LBT.
  • FIG. 13 is a diagram for explaining an example (3) of LBT.
  • FIG. 13 is a diagram for explaining parameters for each channel access priority class p.
  • FIG. 11 is a diagram for explaining an operation example 1.
  • FIG. 11 is a diagram for explaining an operation example 2.
  • FIG. 11 is a diagram for explaining an operation example 2.
  • FIG. 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment.
  • FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to an embodiment.
  • 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 in an embodiment.
  • FIG. 2 is a diagram showing an example of the configuration of a vehicle 2001 in an embodiment.
  • LTE Long Term Evolution
  • NR Universal Terrestrial Radio Access
  • LAN Local Area Network
  • the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (e.g., Flexible Duplex, etc.).
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • another method e.g., Flexible Duplex, etc.
  • "configuring" wireless parameters, etc. may mean that predetermined values are pre-configured, or that wireless parameters notified from the base station 10 or the terminal 20 are configured.
  • FIG. 1 is a diagram to explain V2X.
  • 3GPP is considering the realization of V2X (Vehicle to Everything) or eV2X (enhanced V2X) by expanding D2D functions, and is currently working on specifications.
  • V2X is part of ITS (Intelligent Transport Systems) and is a general term for V2V (Vehicle to Vehicle), which refers to a form of communication between vehicles, V2I (Vehicle to Infrastructure), which refers to a form of communication between vehicles and roadside units (RSUs) installed on the side of the road, V2N (Vehicle to Network), which refers to a form of communication between vehicles and ITS servers, and V2P (Vehicle to Pedestrian), which refers to a form of communication between vehicles and mobile terminals carried by pedestrians.
  • V2V Vehicle to Vehicle
  • V2I Vehicle to Infrastructure
  • RSUs roadside units
  • V2N Vehicle to Network
  • V2P
  • V2X using LTE or NR cellular and device-to-device communications is also called cellular V2X.
  • cellular V2X For NR V2X, studies are underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.
  • LTE or NR V2X will be conducted beyond 3GPP specifications. For example, it is expected that studies will be conducted on ensuring interoperability, reducing costs by implementing higher layers, methods for using or switching between multiple RATs (Radio Access Technologies), compliance with regulations in each country, and methods for acquiring, distributing, managing databases, and using data on LTE or NR V2X platforms.
  • RATs Radio Access Technologies
  • the communication device is mainly assumed to be mounted on a vehicle, but the embodiments are 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 with scheduling capability, etc.
  • SL Sidelink
  • UL Uplink
  • DL Downlink
  • SL may also be called something else.
  • any of Cyclic-Prefix OFDM CP-OFDM
  • DFT-S-OFDM Discrete Fourier Transform-Spread-OFDM
  • OFDM without transform precoding
  • OFDM with transform precoding OFDM with transform precoding
  • Mode 3 and Mode 4 are specified for SL resource allocation to terminal 20.
  • transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from base station 10 to terminal 20.
  • DCI Downlink Control Information
  • Mode 3 also allows SPS (Semi Persistent Scheduling).
  • terminal 20 autonomously selects transmission resources from a resource pool.
  • the slot in the embodiments may be interpreted as a symbol, minislot, subframe, radio frame, or TTI (Transmission Time Interval).
  • a slot is an example of a unit of time, and may be replaced with a term indicating a different unit of time.
  • a cell in the embodiments may be interpreted as a cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.
  • the terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication.
  • the terminal 20 may be a terminal carried by a user, such as a smartphone, or may be an IoT (Internet of Things) device, such as a smart meter.
  • IoT Internet of Things
  • HARQ Hybrid automatic repeat request
  • SFCI Segmentlink Feedback Control Information
  • PSFCH Physical Sidelink Feedback Channel
  • the PSFCH is used to transmit the HARQ-ACK on the sidelink, but this is just one example.
  • the PSCCH may be used to transmit the HARQ-ACK on the sidelink
  • the PSSCH may be used to transmit the HARQ-ACK on the sidelink
  • another channel may be used to transmit the HARQ-ACK on the sidelink.
  • HARQ-ACK information reported by terminal 20 in HARQ
  • This HARQ-ACK may also be referred to as HARQ-ACK information.
  • a codebook applied to HARQ-ACK information reported from terminal 20 to base station 10 or the like is referred to as a HARQ-ACK codebook.
  • the HARQ-ACK codebook specifies the bit string of the HARQ-ACK information. Note that in addition to ACK, NACK is also transmitted using "HARQ-ACK".
  • FIG. 2 is a sequence diagram showing an operation example (1) of V2X.
  • the wireless communication system according to the embodiment may have terminal 20A and terminal 20B. Note that, although there are many user devices in reality, FIG. 2 shows terminal 20A and terminal 20B as an example.
  • terminal 20 when there is no particular distinction between terminals 20A, 20B, etc., they will be simply referred to as "terminal 20" or "user device.”
  • terminal 20 or “user device.”
  • FIG. 2 as an example, a case is shown in which terminals 20A and 20B are both within the coverage of a cell, but the operation in the embodiment can also be applied to a case in which terminal 20B is outside the coverage.
  • the terminal 20 is, for example, a device mounted on 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 smartphone).
  • the terminal 20 may also be an RSU.
  • the RSU may be a UE type RSU having the function of a UE, or a gNB type RSU having the function of a base station device.
  • the terminal 20 does not have to be a device in a single housing.
  • the device including the various sensors may be the terminal 20.
  • terminal 20 scrambles and modulates the codeword of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, it maps the precoded complex-valued symbols to resource elements to generate a transmission signal (e.g., a complex-valued time-domain SC-FDMA signal), which is then transmitted from each antenna port.
  • a transmission signal e.g., a complex-valued time-domain SC-FDMA signal
  • the base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the terminal 20 in this embodiment (e.g., resource pool setting, resource allocation, etc.).
  • the base station 10 may also be an RSU (gNB type RSU).
  • the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or another signal waveform.
  • S-SSB may include Sidelink Primary Synchronization Signal (S-PSS), Sidelink Secondary Synchronization Signal (S-SSS), and Physical Sidelink Broadcast Channel (PSBCH).
  • S-PSS Sidelink Primary Synchronization Signal
  • S-SSS Sidelink Secondary Synchronization Signal
  • PSBCH Physical Sidelink Broadcast Channel
  • the terminal 20 transmits an S-SSB to another terminal 20 based on a signal received from the base station device 10, a GNSS (Global Navigation Satellite System) signal, or a signal received from another terminal 20. If the terminal 20 cannot transmit an S-SSB based on any signal from the base station device 10, the GNSS, or another terminal 20, the terminal 20 may transmit an autonomously determined S-SSB to the other terminal 20.
  • the resources available for the S-SSB may be periodic slots and may be referred to as S-SSB opportunities.
  • the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined period.
  • the resource selection window may be set in the terminal 20 by the base station 10.
  • the predetermined period of the resource selection window may be determined by the implementation conditions of the terminal, such as the processing time or the maximum allowable packet delay time, or may be determined in advance by the specifications, or the predetermined period may be called an interval in the time domain.
  • terminal 20A transmits SCI (Sidelink Control Information) via PSCCH and/or PSSCH using the resources autonomously selected in step S101, and transmits SL data via PSSCH.
  • SCI Servicelink Control Information
  • terminal 20A may transmit PSCCH using time resources that are the same as at least a portion of the time resources of PSSCH, and frequency resources that are adjacent or not adjacent to the frequency resources of PSSCH.
  • Terminal 20B receives the SCI (PSCCH and/or PSSCH) and SL data (PSSCH) transmitted from terminal 20A.
  • the received SCI may include information on the PSFCH resource for terminal 20B to transmit a HARQ-ACK in response to reception of the data.
  • Terminal 20A may transmit information on autonomously selected resources by including it in the SCI. Note that the resources available for the PSFCH may be periodic slots and the last symbols in the slot (excluding the final symbol), and may be called PSFCH opportunities.
  • step S104 terminal 20B uses the PSFCH resources determined from the received SCI to transmit a HARQ-ACK for the received data to terminal 20A.
  • step S105 if the HARQ-ACK received in step S104 indicates a request for retransmission, i.e., if it is a NACK (negative acknowledgement), the terminal 20A retransmits the PSCCH and PSSCH to the terminal 20B.
  • the terminal 20A may retransmit the PSCCH and PSSCH using autonomously selected resources.
  • steps S104 and S105 do not need to be performed.
  • FIG. 3 is a sequence diagram showing an example of V2X operation (2). Blind retransmission without HARQ control may be performed to improve the transmission success rate or reach.
  • step S201 the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined period.
  • the resource selection window may be set in the terminal 20 by the base station 10.
  • the terminal 20A transmits SCI via PSCCH and/or PSSCH using the resources autonomously selected in step S201, and transmits SL data via PSSCH.
  • the terminal 20A may transmit PSCCH using frequency resources adjacent to the frequency resources of the PSSCH, with time resources that are the same as at least a portion of the time resources of the PSSCH.
  • step S204 terminal 20A retransmits the SCI via PSCCH and/or PSSCH and the SL data via PSSCH to terminal 20B using the resources autonomously selected in step S201.
  • the retransmission in step S204 may be performed multiple times.
  • step S204 does not need to be performed.
  • FIG. 4 is a sequence diagram showing an example of V2X operation (3).
  • the base station 10 may perform sidelink scheduling. 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 involving HARQ feedback is applied, the base station 10 may transmit information indicating the PSFCH resources to the terminal 20.
  • step S301 the base station 10 performs SL scheduling by sending DCI (Downlink Control Information) to the terminal 20A via the PDCCH.
  • DCI Downlink Control Information
  • the DCI for SL scheduling is referred to as SL scheduling DCI.
  • step S301 it is assumed that the base station 10 also transmits DCI for DL scheduling (which may also be called DL allocation) to the terminal 20A via the PDCCH.
  • DCI for DL scheduling is called DL scheduling DCI.
  • the terminal 20A that receives the DL scheduling DCI receives DL data via the PDSCH using the resources specified in the DL scheduling DCI.
  • the terminal 20A transmits SCI (Sidelink Control Information) via PSCCH and/or PSSCH using resources specified in the SL scheduling DCI, and transmits SL data via PSSCH.
  • SCI Servicelink Control Information
  • PSSCH Physical Broadcast Control Information
  • the terminal 20A may transmit PSCCH using frequency resources adjacent to the frequency resources of the PSSCH with time resources that are the same as at least a portion of the time resources of the PSSCH.
  • Terminal 20B receives the SCI (PSCCH and/or PSSCH) and SL data (PSSCH) transmitted from terminal 20A.
  • the SCI received via the PSCCH and/or PSSCH includes information on the PSFCH resource for terminal 20B to transmit a HARQ-ACK in response to the reception of the data.
  • the resource information 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 resource information from the DL scheduling DCI or SL scheduling DCI and includes it in the SCI.
  • the resource information may not be included in the DCI transmitted from the base station 10, and the terminal 20A may autonomously include the resource information in the SCI and transmit it.
  • step S304 terminal 20B uses the PSFCH resources determined from the received SCI to transmit a HARQ-ACK for the received data to terminal 20A.
  • the terminal 20A transmits a HARQ-ACK, for example, at a timing (for example, slot-by-slot timing) specified by the DL scheduling DCI (or SL scheduling DCI) using PUCCH (Physical uplink control channel) resources specified by the DL scheduling DCI (or SL scheduling DCI), and the base station 10 receives the HARQ-ACK.
  • the codebook for the HARQ-ACK may include a HARQ-ACK generated based on the HARQ-ACK received from the terminal 20B or a PSFCH that was not received, and a HARQ-ACK for DL data. However, if no DL data is assigned, for example, a HARQ-ACK for DL data is not included. In NR Rel. 16, the codebook for the HARQ-ACK does not include a HARQ-ACK for DL data.
  • step S304 and/or step S305 may not be performed.
  • FIG. 5 is a sequence diagram showing an example of V2X operation (4).
  • the PSFCH format can be, for example, the same format as PUCCH (Physical Uplink Control Channel) format 0. 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 differences in sequence and/or cyclic shift.
  • the PSFCH format is not limited to this.
  • the PSFCH resource may be placed in the last symbol or the last multiple symbols of the slot.
  • a period N is set or predefined for the PSFCH resource. The period N may be set or predefined on a slot-by-slot basis.
  • the vertical axis corresponds to the frequency domain
  • the horizontal axis corresponds to the time domain.
  • the PSCCH may be placed in one symbol at the beginning of the slot, or in multiple symbols from the beginning, or in multiple symbols from a symbol other than the beginning.
  • the PSFCH may be placed in one symbol at the end of the slot, or in multiple symbols at the end of the slot. Note that the above-mentioned "beginning of the slot” and "end of the slot” may omit consideration of symbols for AGC (Automatic Gain Control) and symbols for transmission/reception switching.
  • AGC Automatic Gain Control
  • the "beginning of the slot” and “end of the slot” may mean the first and last symbols, respectively, of the 12 symbols excluding the first and last symbols.
  • the "beginning of the slot” and “end of the slot” may mean the first and last symbols, respectively, of the 12 symbols excluding the first and last symbols.
  • three subchannels are set in the resource pool, and two PSFCHs are placed three slots after the slot in which the PSSCH is placed.
  • the arrow from the PSSCH to the PSFCH shows an example of a PSFCH associated with the PSSCH.
  • step S401 terminal 20A, which is the transmitting terminal 20, performs groupcast to terminals 20B, 20C, and 20D, which are receiving terminals 20, via SL-SCH (Sidelink Shared Channel).
  • terminal 20B uses PSFCH#B
  • terminal 20C uses PSFCH#C
  • terminal 20D uses PSFCH#D to transmit the HARQ response to terminal 20A.
  • the transmitting terminal 20 may know the number of receiving terminals 20 in the groupcast.
  • groupcast option 1 only NACK is sent as a HARQ response, and ACK is not sent.
  • Figure 6 shows an example of sensing operation in NR.
  • the terminal 20 selects a resource and transmits.
  • the terminal 20 performs sensing in a sensing window in a resource pool.
  • the terminal 20 receives a resource reservation field or a resource assignment field included in an SCI transmitted from another terminal 20, and identifies available resource candidates in a resource selection window in the resource pool based on the field.
  • the terminal 20 then randomly selects a resource from the available resource candidates.
  • the resource pool may be set to have a period.
  • the period may be a period of 10240 milliseconds.
  • Fig. 6 shows an example in which slot t 0 SL to slot t Tmax-1 SL are set as a resource pool.
  • the resource pool in each period may have an area set by, for example, a bitmap.
  • a transmission trigger in the terminal 20 occurs in slot n, and the priority of the transmission is pTX .
  • the terminal 20 can detect, for example, that another terminal 20 is transmitting with priority pRX in a sensing window from slot nT0 to the slot immediately before slot nTproc,0 .
  • RSRP Reference Signal Received Power
  • the resource in the resource selection window corresponding to the SCI is excluded.
  • the resource in the resource selection window corresponding to the SCI is not excluded.
  • the threshold may be, for example, a threshold ThpTX, pRX that is set or defined for each resource in the sensing window based on the priority pTX and the priority pRX .
  • resources in the resource selection window that are candidates for resource reservation information corresponding to resources in the sensing window that were not monitored for transmission are excluded.
  • the threshold Th pTX,pRX set for each resource in the sensing window may be increased by 3 dB and resource identification may be performed again. That is, by increasing the threshold Th pTX,pRX and performing resource identification again, the number of resources that are not excluded because the RSRP is less than the threshold may be increased so that the set of resource candidates S A becomes 20% or more of the resource selection window.
  • the operation of increasing the threshold Th pTX,pRX set for each resource in the sensing window by 3 dB and performing resource identification again may be repeated.
  • the lower layer of the terminal 20 may report S A to the upper layer.
  • the upper layer of the terminal 20 may perform random selection on S A to determine a resource to be used.
  • the terminal 20 may perform sidelink transmission using the determined resource.
  • the upper layer may be a MAC layer
  • the lower layer may be a PHY layer or a physical layer.
  • the receiving terminal 20 may detect data transmission from another terminal 20 based on the results of sensing or partial sensing, and receive data from the other terminal 20.
  • FIG. 7 is a flowchart showing an example of preemption in NR.
  • FIG. 8 is a diagram showing an example of preemption in NR.
  • step S501 the terminal 20 performs sensing in a sensing window. When the terminal 20 performs a power saving operation, the sensing may be performed in a predefined limited period.
  • the terminal 20 identifies each resource in the resource selection window based on the sensing result to determine a set S A of resource candidates, and selects resources to be used for transmission (S502).
  • the terminal 20 selects a resource set (r_0, r_1, ...) for determining preemption from the set S A of resource candidates (S503).
  • the resource set may be notified to the PHY layer from the upper layer as a resource for determining whether or not preemption has been performed.
  • step S504 the terminal 20 re-identifies each resource in the resource selection window based on the sensing result at the timing T(r_0) -T3 shown in FIG. 8 to determine a set S A of resource candidates, and further determines preemption for the resource set (r_0, r_1, ...) based on the priority.
  • r_1 shown in FIG. 8 is not included in S A because the SCI transmitted from the other terminal 20 has been detected by re-sensing.
  • the terminal 20 determines that the resource r_1 has been preempted. Note that the lower the value indicating the priority, the higher the priority. That is, when the value prio_RX indicating the priority of the SCI transmitted from another terminal 20 is higher than the value prio_TX indicating the priority of the transport block transmitted from the terminal itself, the terminal 20 does not exclude the resource r_1 from SA .
  • preemption is valid only for a specific priority (for example, sl-PreemptionEnable is any of pl1, pl2, ..., pl8)
  • this priority is set as prio_pre.
  • the terminal 20 determines that the resource r_1 has been preempted.
  • step S505 if 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 performing re-evaluation instead of checking preemption, after determining the set S A of resource candidates in step S504, if a resource in the resource set (r_0, r_1, ...) is not included in S A , the resource is not used and a resource re-selection is performed in the upper layer.
  • FIG. 9 is a diagram showing an example of partial sensing operation in LTE.
  • the terminal 20 selects resources and transmits as shown in FIG. 9.
  • the terminal 20 performs partial sensing on a part of the sensing window in the resource pool, i.e., the sensing target.
  • the terminal 20 receives a resource reservation field included in the SCI transmitted from another terminal 20, and identifies available resource candidates in the resource selection window in the resource pool based on the field. The terminal 20 then randomly selects a resource from the available resource candidates.
  • Fig. 9 shows an example in which subframe t0SL to subframe tTmax-1SL are set as a resource pool.
  • the target area of the resource pool may be set by, for example, a bitmap .
  • a transmission trigger in terminal 20 is assumed to occur in subframe n.
  • Y subframes from subframe ty1SL to subframe tyYSL among subframes n+T1 to n + T2 may be set as a resource selection window.
  • the terminal 20 can detect, for example, that another terminal 20 is transmitting in one or more sensing targets from subframe t y1-k ⁇ Pstep SL to subframe t yY-k ⁇ Pstep SL , which is a Y subframe length.
  • k may be determined by, for example, a 10-bit bitmap.
  • FIG. 9 shows an example in which the third and sixth bits of the bitmap are set to "1" indicating that partial sensing is performed. That is, in FIG. 9, subframes t y1-6 ⁇ Pstep SL to subframe t yY-6 ⁇ Pstep SL and subframes t y1-3 ⁇ Pstep SL to subframe t yY-3 ⁇ Pstep SL are set as sensing targets.
  • the k-th bit of the bitmap may correspond to a sensing window from subframe t y1-k ⁇ Pstep SL to subframe t yY-k ⁇ Pstep SL .
  • y i corresponds to an index (1...Y) in the Y subframe.
  • k is set by a 10-bit bitmap or is predefined, and P step may be 100 ms.
  • P step may be (U/(D+S+U))*100 ms.
  • 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 threshold may be, for example, a threshold Th pTX,pRX that is set or defined for each resource in the sensing target based on the transmitting side priority p TX and the receiving side priority p RX .
  • the terminal 20 identifies resources occupied by other UEs, and the resources excluding the identified resources become available resource candidates. Note that the Y subframe does not have to be consecutive. If a set of available resource candidates is S A , when S A is less than 20% of the resources in the resource selection window, the threshold Th pTX,pRX set for each sensing target resource may be increased by 3 dB and resource identification may be performed again.
  • the threshold Th pTX,pRX may be increased and resource identification may be performed again to increase the number of resources that are not excluded because their RSRP is below the threshold. Furthermore, the RSSI of each resource in S A may be measured and the resource with the smallest 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 becomes equal to or greater than 20% of the resource selection window.
  • the lower layer of the terminal 20 may report S B to the upper layer.
  • the upper layer of the terminal 20 may perform random selection on S B to determine the resource to be used.
  • the terminal 20 may perform sidelink transmission using the determined resource. After securing the resource once, the terminal 20 may use the resource periodically without performing sensing for a predetermined number of times (e.g., C resel times).
  • a terminal 20 to which partial sensing is applied performs reception and sensing only in specific slots within the sensing window. That is, the terminal 20 may perform resource identification by sensing only limited resources compared to full sensing, and perform partial sensing to select resources from the identified resource set. The terminal 20 may also perform random selection to select resources from the identified resource set by setting the resources in the resource selection window as the identified resource set without excluding resources from the resources in the resource selection window.
  • the method of performing random selection at the time of resource selection and using sensing information during reevaluation or preemption checks may be treated as partial sensing or as random selection.
  • sensing operations may be 1) and 2) shown below. Note that sensing and monitoring may be interchangeable, and the sensing operations may include at least one of measuring the received RSRP, obtaining reservation resource information, and obtaining priority information.
  • Periodic-based partial sensing In a mechanism in which sensing is performed only on some slots, this is an operation of determining sensing slots based on a reservation periodicity.
  • the reservation periodicity is a value associated with a resource reservation period field. The period may be replaced with periodicity.
  • SL-DRX discontinuous reception
  • reception operations are only performed during a specified time period.
  • partial sensing is supported as one of the power saving functions.
  • the terminal 20 may execute the periodic partial sensing described above.
  • the terminal 20 may receive information from the base station 10 for configuring a resource pool in which partial sensing is configured and periodic reservation is enabled.
  • FIG 10 is a diagram for explaining an example of periodic partial sensing. As shown in FIG 10, Y candidate slots for resource selection are selected from a resource selection window [n+ T1 , n+ T2 ].
  • Sensing may be performed by treating t y SL as one slot included in the Y candidate slots and treating t yk ⁇ Preserve SL as a target slot for periodic partial sensing.
  • P reserve may correspond to all values included in a set or predefined set sl-ResouceReservePeriodList.
  • values of P reserve limited to a subset of sl-ResouceReservePeriodList may be set or predefined.
  • P reserve and sl-ResouceReservePeriodList may be set for each transmission resource pool of resource allocation mode 2.
  • a period included in sl-ResouceReservePeriodList other than the limited subset may be monitored.
  • the terminal 20 may additionally monitor an opportunity corresponding to P_RSVP_Tx.
  • the terminal 20 may monitor the most recent sensing opportunity in a certain reservation period before slot n of the resource selection trigger or before the first slot of Y candidate slots that are subject to processing time limitations.
  • the terminal 20 may also additionally monitor periodic sensing opportunities corresponding to a set of one or more k values.
  • the k value may be set to a value corresponding to the most recent sensing opportunity in a certain reservation period before slot n of the resource selection trigger or before the first slot of Y candidate slots that are subject to processing time limitations, and a value corresponding to the sensing opportunity immediately prior to the most recent sensing opportunity in the certain reservation period.
  • partial sensing is supported as one of the power saving functions.
  • the terminal 20 may execute the above-mentioned continuous partial sensing.
  • the terminal 20 may receive information from the base station 10 for configuring a resource pool in which partial sensing is configured and non-periodic reservations are enabled.
  • Fig. 11 is a diagram for explaining an example of continuous partial sensing.
  • terminal 20 selects Y candidate slots for resource selection from the resource selection window [n+ T1 , n+ T2 ].
  • the beginning of the Y candidate slots is represented as slot t y1 , the next slot as t y2 , ..., and the end of the Y candidate slots as slot t yY .
  • Terminal 20 performs sensing in the interval [n+ TA , n+ TB ], and executes resource selection in n+ TB or after n+ TB (n+ TC ).
  • the above-mentioned periodic partial sensing may be additionally executed.
  • TA and TB in the interval [n+ TA , n+ TB ] may be any value.
  • n may be replaced with the index of any slot among Y candidate slots.
  • the interval [a, b] is the interval from slot a to slot b, including slot a and slot b.
  • the interval (a, b) is the interval from slot a to slot b, not including slot a and slot b.
  • the candidate resources to be selected are referred to as Y candidate slots, but all slots in the interval [n+T 1 , n+T 2 ] may be candidate slots, or only some of the slots may be candidate slots.
  • inter-terminal coordination has been specified as a method for improving reliability and delay performance.
  • the inter-terminal coordination method 1 and inter-terminal coordination method 2 shown below have been specified.
  • the terminal 20 that transmits coordination information will be referred to as UE-A
  • the terminal 20 that receives the coordination information will be referred to as UE-B.
  • Inter-device cooperation method 1 For the transmission of UE-B, a preferred resource set and/or a non-preferred resource set are transmitted from UE-A to UE-B.
  • inter-UE coordination method 1 is also referred to as IUC scheme 1 (Inter-UE coordination scheme 1).
  • Inter-device cooperation method 2 The UE-A transmits to the UE-B information indicating that a collision with another transmission or reception is expected and/or a collision has been detected in a resource indicated by the SCI received from the UE-B.
  • the information may be transmitted via a PSFCH.
  • the inter-UE coordination method 2 is also referred to as an IUC scheme 2 (Inter-UE coordination scheme 2).
  • 3GPP Release 16 or Release 17 sidelink is specified for 1) and 2) below.
  • ITS Intelligent Transport Systems
  • FR1 Frequency range 1
  • FR2 Frequency range 2
  • unlicensed bands such as the 5 GHz-7 GHz band and the 60 GHz band.
  • Figure 12 shows an example of frequency bands used in wireless communication systems. In the NR specifications of 3GPP Release 15 and Release 16, it is being considered to operate in frequency bands of 52.6 GHz and above. As shown in Figure 12, FR (Frequency range) 1, which is currently specified for operation, is the frequency band from 410 MHz to 7.125 GHz, SCS (Sub carrier spacing) is 15, 30 or 60 kHz, and the bandwidth is from 5 MHz to 100 MHz.
  • FR Frequency range 1
  • SCS Sub carrier spacing
  • FR2-1 is the frequency band from 24.25 GHz to 52.6 GHz, with SCS using 60, 120 or 240 kHz, and bandwidth from 50 MHz to 400 MHz.
  • FR2-2 may be envisioned from 52.6 GHz to 71 GHz. It may also be envisioned to support frequency bands above 71 GHz.
  • Cyclic Prefix-Orthogonal Frequency Division Multiplexing CP-OFDM
  • DFT-S-OFDM Discrete Fourier Transform-Spread
  • SCS Sub-Carrier Spacing
  • examples of unlicensed bands in the 5GHz-7GHz band include 5.15GHz to 5.35GHz, 5.47GHz to 5.725GHz, and 5.925GHz and above.
  • examples of unlicensed bands in the 60 GHz band include 59 GHz to 66 GHz, 57 GHz to 64 GHz or 66 GHz, and 59.4 GHz to 62.9 GHz.
  • LBT Listen before talk
  • the base station 10 or terminal 20 performs power detection for a specified period immediately before transmitting, and if the power exceeds a certain value, i.e. if it detects transmission from another device, it stops transmission (this may be called LBT failure).
  • a maximum channel occupancy time MCOT is specified. MCOT is the maximum time period during which continued transmission is permitted when transmission begins after LBT, and is, for example, 4 ms in Japan.
  • the Occupied channel bandwidth (OCB) requirement states that when a transmission uses a certain carrier bandwidth, it must use at least X% of that bandwidth. For example, in Europe, it is required to use 80% to 100% of the nominal channel bandwidth (NCB). The OCB requirement is intended to ensure that power detection for channel access is performed correctly.
  • maximum transmission power and maximum power spectral density in order to avoid excessive interference, it is stipulated that transmissions must be performed at or below a certain transmission power. For example, in Europe, the maximum transmission power is 23 dBm in the 5150 MHz-5350 MHz band. Also, in Europe, the maximum power spectral density is 10 dBm/MHz in the 5150 MHz-5350 MHz band.
  • LBT is performed when accessing a channel.
  • the base station 10 or terminal 20 performs power detection for a specified period immediately before transmitting, and if the power exceeds a certain value, i.e. if a transmission from another device is detected, the transmission is halted.
  • a certain value i.e. if a transmission from another device is detected.
  • the transmission is halted.
  • the maximum transmission power and maximum power spectral density it is specified that transmission is performed at or below a specified transmission power. It is also specified that the terminal has the capability to satisfy the OCB requirements.
  • the following four types of channel access procedures are defined based on the difference in the time behavior of LBT (the period during which sensing is performed). Note that this sensing is a different operation from the sidelink sensing described above, and is described as LBT sensing to distinguish it.
  • Type 1 Performs variable time LBT sensing before transmission. Also known as Category 4 LBT.
  • Type 2A Performs 25 ⁇ s of LBT sensing before transmission. Also known as Category 2 LBT.
  • Type 2B Performs 16 ⁇ s LBT sensing before transmission. Also known as Category 2 LBT.
  • Type 2C Start transmitting without LBT. Same as licensed band transmission.
  • Figure 13 is a diagram for explaining an example of LBT (1).
  • Figure 13 is an example of a type 1 channel access procedure.
  • Type 1 is further classified into four classes indicating channel access priority classes (CAPC) based on differences in LBT sensing length.
  • LBT sensing is performed in the following two periods:
  • the first period is a prioritization period or a defer duration, and has a length of 16+9 ⁇ m p [ ⁇ s], where m p is a fixed value defined for each channel access priority class.
  • the second period is a backoff procedure, and has a length of 9 x N [ ⁇ s].
  • the value of N is randomly determined from a certain range (see CWS Adjustment Procedure in Non-Patent Document 4).
  • N is the initial value of the backoff counter, and the value of the backoff counter is decreased by 1 each time the power of a signal from another device is not detected within 9 [ ⁇ s].
  • the 9 ⁇ s LBT sensing period may be referred to as the LBT sensing slot period.
  • m p 3 and the hold period is 43 ⁇ s.
  • the backoff counter is fixed while the channel is busy.
  • the contention window size (CWS) is expanded from 3 to 13 in the NR-U gNB.
  • Figure 14 is a diagram for explaining an example of LBT (2).
  • Figure 14 is an example of a channel access procedure of Type 2A or Type 2B without random backoff.
  • a power detection gap of 25 ⁇ s or more is set before transmission for Type 2A, and a power detection gap of 16 ⁇ s is set for Type 2B.
  • FIG. 15 is a diagram for explaining an example of LBT (3).
  • FIG. 15 is an example of a type 2C channel access procedure. As shown in FIG. 15, no power detection is performed before transmission, and transmission is performed immediately after a gap not exceeding 16 ⁇ s. The transmission period may be up to 584 ⁇ s.
  • the initial value N of the back-off counter is set to a random number in the interval from 0 to CW p , whose value range is determined based on the channel access priority class p.
  • Figure 16 shows an example of m p , the minimum value CW p ,min of CW p , and the maximum value CW p, max of CW p, which are specified for each channel access priority class p in the UL.
  • m p , CW p,min and CW p,max are determined by the channel access priority class p.
  • the LBT period calculated from Table 1 is a minimum of 34 ⁇ s and a maximum of 88 ⁇ s.
  • the LBT period calculated from Table 1 is a minimum of 34 ⁇ s and a maximum of 160 ⁇ s.
  • the LBT period calculated from Table 1 is a minimum of 43 ⁇ s and a maximum of 9286 ⁇ s.
  • the LBT period calculated from Table 1 is a minimum of 79 ⁇ s and a maximum of 9286 ⁇ s.
  • Table 1 is used for UL.
  • the LBT type and channel access priority class may be determined based on notification from the base station 10, the channel type, etc.
  • the 25 ⁇ s or 16 ⁇ s gap may be set by the base station 10 scheduling, taking into account the TA (Timing Advance) and CP extension.
  • the LBT applied to channel access is performed for each predetermined bandwidth (e.g., 20 MHz). This may be called an LBT channel, an RB set, or an LBT band, but is not limited to these. If no power is detected in the LBT channel that contains the respective transmission, the transmission can be performed. On the other hand, each CC in Uu may be defined with a bandwidth wider than the LBT channel. In other words, wideband operation is supported. Note that Uu is the radio interface between the Universal Terrestrial Radio Access Network (UTRAN) and the User Equipment (UE).
  • UTRAN Universal Terrestrial Radio Access Network
  • UE User Equipment
  • the terminal 20 may perform the following operations.
  • the terminal 20 executes communication on the sidelink channel (PSCCH/PSSCH/PSFCH) and controls communication on the sidelink channel (PSCCH/PSSCH/PSFCH).
  • the terminal 20 controls the transmission of the sidelink channel in a specific manner when two or more transmission opportunities (PSFCH occasions) are available as transmission opportunities for the sidelink feedback channel (PSFCH) for transmitting feedback.
  • the feedback may include a HARQ response, as shown in FIG. 5 above.
  • the feedback may include information corresponding to IUC scheme 2 above.
  • PSFCH may be used as a term to refer to the feedback.
  • the identification method may be different for a PSFCH (e.g., a first PSFCH) for transmitting a HARQ response and a PSFCH (e.g., a second PSFCH) for transmitting information corresponding to IUC scheme 2.
  • a PSFCH e.g., a first PSFCH
  • a PSFCH e.g., a second PSFCH
  • the terminal 20 determines at least one resource of the sidelink control channel (PSCCH) and the sidelink shared channel (PSSCH) based on two or more transmission opportunities (PSFCH occasions) as a method of identification.
  • PSCCH sidelink control channel
  • PSSCH sidelink shared channel
  • PSFCH occasions transmission opportunities
  • the terminal 20 transmitting the PSCCH/PSSCH determines to use the PSCCH/PSSCH resources from the last PSFCH occasion onwards, among two or more PSFCH occasions, for retransmission.
  • the PSCCH/PSSCH resources may be the resources T after PSFCH occasion #2.
  • T may be defined in ⁇ s, or in symbol, sub-slot or slot.
  • T may be predefined in the wireless communication system, or may be set by an RRC parameter.
  • the PSFCH may be assumed to be a PSFCH (first PSFCH) for transmitting a HARQ response.
  • the terminal 20 that transmits the PSCCH/PSSCH may be interpreted as the terminal 20 that receives the first PSFCH.
  • the terminal 20 transmitting the PSCCH/PSSCH determines to use the PSCCH/PSSCH resources from a specific PSFCH occasion onwards, among two or more PSFCH occasions, for retransmission.
  • the PSCCH/PSSCH resources may be resources T elapsed from PSFCH occasion #2.
  • the PSCCH/PSSCH resources may be resources T elapsed from PSFCH occasion #1.
  • T may be defined in ⁇ s, or may be defined in symbol, sub-slot or slot. T may be predefined in the wireless communication system, or may be set by an RRC parameter.
  • the specific PSFCH occasion may be predefined in the wireless communication system or may be configured by an RRC parameter.
  • the PSFCH may be assumed to be a PSFCH (first PSFCH) for transmitting a HARQ response.
  • the terminal 20 that transmits the PSCCH/PSSCH may be interpreted as the terminal 20 that receives the first PSFCH.
  • the terminal 20 transmitting the PSCCH/PSSCH may not retransmit the PSCCH/PSSCH if it receives a positive HARQ response (ACK) in a PSFCH occasion T' earlier than the PSCCH/PSSCH resource for retransmission.
  • the conditions may be different. For example, in groupcast option 1 (NACK-only feedback), "if a positive HARQ response (ACK) is received” may be replaced with "if no negative HARQ response (NACK) is detected", and in groupcast option 2 (ACK/NACK feedback), "if a positive HARQ response (ACK) is received” may be replaced with "if a positive HARQ response (ACK) is received from all terminals 20 receiving the groupcast”.
  • T' may be defined in ⁇ s, or may be defined in symbol, sub-slot, or slot. T' may be predefined in the wireless communication system, or may be set by an RRC parameter.
  • the PSFCH may be assumed to be a PSFCH (first PSFCH) for transmitting a HARQ response.
  • the terminal 20 that transmits the PSCCH/PSSCH may be interpreted as the terminal 20 that receives the first PSFCH.
  • a terminal 20 transmitting a PSCCH/PSSCH receives a conflict indication in a PSFCH occasion T' earlier than the reserved PSCCH/PSSCH resource
  • the terminal 20 may perform reselection of the PSCCH/PSSCH resource without using the reserved PSCCH/PSSCH resource.
  • T' may be defined in ⁇ s, or in symbol, sub-slot or slot.
  • T' may be predefined in the wireless communication system, or may be set by an RRC parameter.
  • the PSFCH may be assumed to be a PSFCH (second PSFCH) for transmitting information corresponding to IUC scheme 2.
  • the terminal 20 that transmits the PSCCH/PSSCH may be interpreted as the terminal 20 that receives the second PSFCH.
  • the conflict indication may be information indicating that a collision with another transmission or reception is expected and/or a resource in which a collision has been detected in a resource indicated by an SCI (PSCCH/PSSCH) transmitted from a terminal 20 transmitting a PSCCH/PSSCH.
  • PSCCH/PSSCH SCI
  • the PSCCH/PSSCH resources are determined based on two or more PSFCH occasions, making it possible to clarify the timeline between the PSSCH/PSFCH and the PSFCH, and thus suppressing unnecessary transmission/retransmission of the PSCCH/PSSCH.
  • the terminal 20 transmits a sidelink feedback channel (PSFCH) at a specific occasion selected from two or more transmission occasions (PSFCH occasions) as a method of identification.
  • PSFCH sidelink feedback channel
  • the options shown below are possible as options for the operation example 2. Note that different options may be applied depending on the cast type and the feedback method. For example, a common option may be applied between unicast, groupcast option 1 (NACK-only feedback), and groupcast option 2 (ACK/NACK feedback), or different options may be applied.
  • the terminal 20 transmitting the PSFCH may select the earliest PSFCH occasion in time as the specific occasion. If the terminal 20 transmitting the PSFCH is able to transmit the PSFCH, it may not need to transmit the PSFCH in the subsequent PSFCH occasion (may cancel it). If the terminal 20 transmitting the PSFCH is unable to transmit the PSFCH, it may reselect the earliest PSFCH occasion in time as the specific occasion. The terminal 20 transmitting the PSFCH may repeat this operation for all PSFCH occasions.
  • the cause of the inability to transmit the PSFCH may include or be limited to LBT failure.
  • the cause of the inability to transmit the PSFCH may also include other causes (e.g., prioritization, half-duplex, etc.).
  • the terminal 20 transmitting the PSFCH may select all PSFCH occasions as specific occasions. That is, the terminal 20 transmitting the PSFCH may transmit the PSFCH in all of two or more PSFCH occasions. In such a case, it may not be necessary to take into consideration whether the PSFCH was able to be transmitted.
  • the terminal 20 transmitting the PSFCH may not transmit (may cancel) the PSFCH in the #nth PSFCH occasion if it receives the retransmitted PSCCH/PSSCH by a timing T'' before the #nth PSFCH occasion.
  • T'' may be defined in ⁇ s, or in symbol, sub-slot or slot.
  • T'' may be predefined in the wireless communication system, or may be set by an RRC parameter.
  • the PSFCH may be assumed to be a PSFCH (first PSFCH) for transmitting a HARQ response.
  • a terminal 20 transmitting a PSFCH may be interpreted as a terminal 20 receiving a PSCCH/PSSCH.
  • the terminal 20 transmitting the PSFCH does not have to transmit the PSFCH in the #nth PSFCH occasion even if it cannot transmit the PSFCH in a PSFCH occasion prior to the #nth PSFCH occasion.
  • the terminal 20 transmitting the PSFCH may transmit the PSFCH in response to the retransmitted PSCCH/PSSCH.
  • the terminal 20 controls the transmission of the sidelink channel in a specific manner when two or more transmission opportunities (PSFCH occasions) are available as transmission opportunities for the sidelink feedback channel (PSFCH) for transmitting feedback.
  • PSFCH occasions two or more transmission opportunities
  • PSFCH sidelink feedback channel
  • a conventional SL channel and SL signal configuration is used, but is not limited to this.
  • the above disclosure may also be applied when an interlaced channel is applied as a configuration to satisfy the OCB requirements.
  • UE capabilities related to the applicability and operation of the above disclosure may be defined and may or may not be reported to the base station 10 and/or terminal 20.
  • the UE's SL transmission may be PSCCH, PSSCH, PSFCH, S-SSB, or SL-PRS, and different channels or signals may be applied to each operation of the embodiment.
  • At least one of the UE's SL transmissions may be a UL transmission.
  • the embodiments may be applied to resource selection, resource reselection, reevaluation, and preemption checks.
  • V2X terminals may also be applied to terminals that perform D2D communication.
  • the base station 10 and the terminal 20 include functions for implementing the above-mentioned embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions in the embodiments.
  • Fig. 20 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 20, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140.
  • the functional configuration shown in Fig. 20 is merely an example. As long as the operation according to the embodiment can be executed, the names of the functional divisions and functional units may be any names.
  • the transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly.
  • the receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals.
  • the transmitter 110 also 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 in a storage device the setting information that is set in advance and various setting information to be transmitted to the terminal 20, and reads it from the storage device as necessary.
  • the content of the setting information is, for example, information related to the setting of D2D communication.
  • control unit 140 performs processing related to settings for the terminal 20 to perform D2D communication. Furthermore, the control unit 140 transmits scheduling for D2D communication and DL communication to the terminal 20 via the transmission unit 110. Furthermore, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the reception unit 120. Functional units in the control unit 140 related to signal transmission may be included in the transmission unit 110, and functional units in the control unit 140 related to signal reception may be included in the reception unit 120.
  • Fig. 21 is a diagram showing an example of the functional configuration of the terminal 20.
  • the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240.
  • the functional configuration shown in Fig. 21 is merely an example. As long as the operation according to the embodiment can be executed, the names of the functional divisions and functional units may be any names.
  • the transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly.
  • the receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals.
  • the receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals or reference signals transmitted from the base station 10.
  • the transmitter 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20 as D2D communication, and the receiver 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from other terminals 20.
  • the setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in a storage device, and reads it out from the storage device as necessary.
  • the setting unit 230 also stores setting information that is set in advance.
  • the content of the setting information is, for example, information related to the setting of D2D communication, etc.
  • the control unit 240 controls the D2D communication that establishes an RRC connection with another terminal 20.
  • the control unit 240 also performs processing related to power saving operation.
  • the control unit 240 also performs processing related to HARQ of D2D communication and DL communication.
  • the control unit 240 also transmits information related to HARQ responses of D2D communication and DL communication to another terminal 20 scheduled by the base station 10 to the base station 10.
  • the control unit 240 may also schedule D2D communication for the other terminal 20.
  • the control unit 240 may also autonomously select resources to be used for D2D communication from a resource selection window based on the result of sidelink sensing, or may perform reevaluation or preemption.
  • the control unit 240 also performs processing related to power saving in transmission and reception of D2D communication.
  • the control unit 240 also performs processing related to inter-terminal coordination in D2D communication.
  • the control unit 240 also performs processing related to LBT in D2D communication.
  • the functional units in the control unit 240 related to signal transmission may be included in the transmitting unit 210, and the functional units in the control unit 240 related to signal reception may be included in the receiving unit 220.
  • each functional block may be realized using one device that is physically or logically combined, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices.
  • the functional block may be realized by combining the one device or the multiple devices with software.
  • Functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
  • a functional block (component) that performs the transmission function is called a transmitting unit or transmitter.
  • the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • FIG. 22 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 in one embodiment of the present disclosure.
  • the above-mentioned base station 10 and terminal 20 may be 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, etc.
  • the term "apparatus” may be interpreted as a circuit, device, unit, etc.
  • the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.
  • the functions of the base station 10 and the terminal 20 are realized by loading specific software (programs) onto hardware such as the processor 1001 and the storage device 1002, causing the processor 1001 to perform calculations, control communications by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
  • the processor 1001 for example, runs an operating system to control the entire computer.
  • the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
  • CPU central processing unit
  • control unit 140, control unit 240, etc. may be realized by the processor 1001.
  • the processor 1001 reads out a program (program code), software module, 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 the program.
  • the program is a program that causes a computer to execute at least a part of the operations described in the above embodiment.
  • the control unit 140 of the base station 10 shown in FIG. 20 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001.
  • the control unit 240 of the terminal 20 shown in FIG. 21 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from a network via a telecommunication line.
  • the storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc.
  • the storage device 1002 may also be called a register, a cache, a main memory, etc.
  • the storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to one embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc.
  • the above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the auxiliary 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 referred to as, for example, a network device, a network controller, a network card, or a communication module.
  • the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission path interface, etc. may be realized by the communication device 1004.
  • the transmitting/receiving section may be implemented as a transmitting section or a receiving section that are physically or logically separated.
  • the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
  • the output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one structure (e.g., 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 each device.
  • the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), etc., and some or all of the functional blocks may be realized by the hardware.
  • the processor 1001 may be implemented using at least one of these pieces of hardware.
  • FIG. 23 shows an example of the configuration of a vehicle 2001.
  • the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013.
  • Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.
  • the drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.
  • the steering unit 2003 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.
  • the electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001.
  • the electronic control unit 2010 may also be called an ECU (Electronic Control Unit).
  • Signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels acquired by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, an accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, a brake pedal depression amount signal acquired by a brake pedal sensor 2026, a shift lever operation signal acquired by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028.
  • the information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices.
  • the information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.
  • the information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
  • input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
  • output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
  • the driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices.
  • the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.
  • the communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port.
  • the communication module 2013 transmits and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.
  • the communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
  • the communication module 2013 may be located either inside or outside the electronic control unit 2010.
  • the external device may be, for example, a base station, a mobile station, etc.
  • the communication module 2013 may transmit at least one of the signals from the various sensors 2021-2028 described above input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication.
  • the electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input.
  • the PUSCH transmitted by the communication module 2013 may include information based on the above input.
  • the communication module 2013 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device, and displays it on the information service unit 2012 provided in the vehicle 2001.
  • the information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013).
  • the communication module 2013 also stores various information received from an external device in a memory 2032 that can be used by the microprocessor 2031.
  • the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.
  • the operations of multiple functional units may be physically performed by one part, or the operations of one functional unit may be physically performed by multiple parts.
  • the order of processing procedures described in the embodiments 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, but such devices may be realized by hardware, software, or a combination thereof.
  • the software operated by the processor possessed by the base station 10 according to the embodiment and the software operated by the processor possessed by the terminal 20 according to the embodiment may each be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server or any other suitable storage medium.
  • the notification of information is not limited to the aspects/embodiments described in the present disclosure and may be performed using other methods.
  • the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these.
  • RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
  • Each aspect/embodiment described in this disclosure may be implemented in any mobile communication system including, but not limited to, LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or decimal number)), FRA (Future Ra).
  • the present invention may apply to at least one of systems that utilize IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), or other appropriate systems, and next generation systems that are extended, modified, created, or defined based on these.
  • the present invention may also apply to a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-
  • certain operations that are described as being performed by the base station 10 may in some cases be performed by its upper node.
  • a network consisting of one or more network nodes having a base station 10 it is clear that various operations performed for communication with a terminal 20 may be performed by the base station 10 and at least one of the other network nodes other than the base station 10 (such as, but not limited to, an MME or an S-GW).
  • the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).
  • the information or signals described in this disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). They may be input and output via multiple network nodes.
  • the input and output information may be stored in a specific location (e.g., memory) or may be managed using a management table.
  • the input and output information may be overwritten, updated, or added to.
  • the output information may be deleted.
  • the input information may be sent to another device.
  • the determination in this disclosure may be based on a value represented by one bit (0 or 1), a Boolean (true or false) value, or a comparison of numerical values (e.g., a comparison with a predetermined value).
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • software, instructions, information, etc. may be transmitted and received over a transmission medium.
  • a transmission medium such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave)
  • wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
  • wireless technologies such as infrared, microwave
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
  • the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
  • the channel and the symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.
  • system and “network” are used interchangeably.
  • a radio resource may be indicated by an index.
  • the names used for the parameters described above are not intended to be limiting in any way. Furthermore, the formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure.
  • the various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.
  • Base station BS
  • wireless base station base station
  • base station fixed station
  • NodeB eNodeB
  • gNodeB gNodeB
  • access point e.g., "transmission point”
  • gNodeB gNodeB
  • base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.
  • a base station can accommodate one or more (e.g., three) cells.
  • the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)).
  • RRH Remote Radio Head
  • the term "cell” or “sector” refers to part or the entire coverage area of a base station and/or a base station subsystem that provides communication services in this coverage.
  • a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.
  • MS Mobile Station
  • UE User Equipment
  • a mobile station may also be referred to 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 terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc.
  • At least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
  • the moving object is a movable object, and the moving speed is arbitrary. It also includes the case where the moving object is stopped.
  • the moving object includes, but is not limited to, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, an excavator, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcar, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a drone (registered trademark), a multicopter, a quadcopter, a balloon, and objects mounted thereon.
  • the moving object may also be a moving object that travels autonomously based on an operation command.
  • At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations.
  • at least one of the base station and the 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.
  • each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
  • the terminal 20 may be configured to have the functions of the base station 10 described above.
  • terms such as "uplink” and "downlink” may be read as terms corresponding to communication between terminals (for example, "side”).
  • the uplink channel, the downlink channel, etc. may be read as a side channel.
  • the user terminal in this disclosure may be interpreted as a base station.
  • the base station may be configured to have the functions of the user terminal described above.
  • determining and “determining” may encompass a wide variety of actions. “Determining” and “determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), and considering ascertaining to be a “judging” or “determining.” Also, “determining” and “determining” may include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and considering ascertaining to be a “judging” or “determining.” Additionally, “judgment” and “decision” can include considering resolving, selecting, choosing, establishing, comparing, etc., to have been “judged” or “decided.” In other words, “judgment” and “decision” can include considering some action to have been “judged” or “decided.” Additionally, “judgment (decision)” can be interpreted
  • connection refers to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
  • the coupling or connection between elements may be physical, logical, or a combination thereof.
  • “connected” may be read as "access.”
  • two elements may be considered to be “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.
  • the reference signal may also be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.
  • the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to an element using a designation such as "first,” “second,” etc., 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, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
  • a radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.
  • Numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • the numerology may indicate, for example, at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, a particular filtering operation performed by the transceiver in the frequency domain, a particular windowing operation performed by the transceiver in the time domain, etc.
  • SCS Subcarrier Spacing
  • TTI Transmission Time Interval
  • radio frame structure a particular filtering operation performed by the transceiver in the frequency domain, a particular windowing operation performed by the transceiver in the time domain, etc.
  • a slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.).
  • a slot may be a time unit based on numerology.
  • a slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot.
  • a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A.
  • a PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.
  • Radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Radio frame, subframe, slot, minislot, and symbol may each be referred to by a different name that corresponds to the radio frame, subframe, slot, minislot, and symbol.
  • one subframe may be called a Transmission Time Interval (TTI)
  • TTI Transmission Time Interval
  • multiple consecutive subframes may be called a TTI
  • one slot or one minislot may be called a TTI.
  • at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms.
  • the unit expressing the TTI may be called a slot, minislot, etc., instead of a subframe.
  • TTI refers to, for example, the smallest time unit for scheduling in wireless communication.
  • a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units.
  • wireless resources such as frequency bandwidth and transmission power that can be used by each terminal 20
  • TTI is not limited to this.
  • the TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc.
  • the time interval e.g., the number of symbols
  • the time interval in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.
  • one slot or one minislot when called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling.
  • the number of slots (minislots) that constitute the minimum time unit of scheduling may be controlled.
  • a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
  • TTI shorter than a normal TTI may be referred to as a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
  • a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms
  • a short TTI e.g., a shortened TTI, etc.
  • a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
  • the number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12.
  • the number of subcarriers included in an RB may be determined based on the numerology.
  • the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length.
  • One TTI, one subframe, etc. may each be composed of one or more resource blocks.
  • one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.
  • PRB physical resource block
  • SCG sub-carrier group
  • REG resource element group
  • PRB pair an RB pair, etc.
  • a resource block may be composed of one or more resource elements (RE).
  • RE resource elements
  • one RE may be a radio resource area of one subcarrier and one symbol.
  • a Bandwidth Part which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RBs relative to a common reference point of the carriers.
  • 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 set for a terminal 20 within one carrier.
  • At least one of the configured BWPs may be active, and the terminal 20 may not be expected to transmit or receive a specific signal/channel outside the active BWP.
  • BWP bit stream
  • radio frames, subframes, slots, minislots, and symbols are merely examples.
  • the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.
  • a and B are different may mean “A and B are different from each other.”
  • the term may also mean “A and B are each different from C.”
  • Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
  • notification of specific information is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).
  • the first feature is a terminal that includes a communication unit that executes communication on a sidelink channel and a control unit that controls the communication on the sidelink channel, and the control unit controls the transmission of the sidelink channel in a specific manner when two or more transmission opportunities are available as transmission opportunities on a sidelink feedback channel that transmits feedback.
  • the second feature is that in the first feature, the sidelink channel includes at least one of a sidelink control channel and a sidelink shared channel in addition to the sidelink feedback channel, and the control unit determines resources of at least one of the sidelink control channel and the sidelink shared channel based on the two or more transmission opportunities as the identification method.
  • the third feature is the terminal according to the first or second feature, in which the control unit transmits the sidelink feedback channel at a specific opportunity selected from the two or more transmission opportunities as the identification method.
  • the fourth feature is a wireless communication method comprising step A of performing communication on a sidelink channel and step B of controlling the communication on the sidelink channel, and step A includes a step of controlling the transmission of the sidelink channel in a specific manner when two or more transmission opportunities are available as transmission opportunities on a sidelink feedback channel for transmitting feedback.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOSE LEON CALVO, ERICSSON: "PHY channel design framework for SL-U", 3GPP DRAFT; R1-2212223; TYPE DISCUSSION; NR_SL_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052222786 *
SEUNGMIN LEE, LG ELECTRONICS: "Discussion on physical channel design framework for sidelink on unlicensed spectrum", 3GPP DRAFT; R1-2211264; TYPE DISCUSSION; NR_SL_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052221828 *

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