Abstract: Embodiments of the present invention disclose a communication method, apparatus, and system. The method includes: A first terminal device sends a wake-up signal to a second terminal device by using a first frequency domain resource, where the wake-up signal is used to activate a second frequency domain resource, the first frequency domain resource is used by two or more terminal devices to transmit wake-up signals, and the first frequency domain resource does not overlap the second frequency domain resource; and the first terminal device sends sidelink SL data to the second terminal device by using the second frequency domain resource. Embodiments of the present invention can reduce power consumption of the terminal devices in sidelink communication.

Abstract: This application provides a method for configuring a sidelink resource and a communication apparatus. A transmit end user may indicate, by using SCI based on a preempted COT, that last several symbols in a slot are blank symbols, and a receive end may perform LBT in the COT based on a reserved blank, to implement COT sharing. In addition, after the COT is preempted, the transmit end user may flexibly configure periodicity information of a PSFCH resource, and send the periodicity information of the PSFCH resource to a receive end user. With reference to frame structure information, a position of a PSFCH slot in a slot in a corresponding direction can be calculated by users of the transmit end and the receive end by using a modulo operation, to feed back HARQ information in a corresponding slot in which the PSFCH exists.

Abstract: In accordance with an embodiment, a method includes: determining, by a first terminal device, a first communication resource in an unlicensed spectrum, wherein the first communication resource is used to send a sidelink synchronization signal block (S-SSB), and the S-SSB is used for synchronization between a second terminal device and the first terminal device; and sending, by the first terminal device, the S-SSB to the second terminal device on the first communication resource.

Abstract: A communication method, a terminal apparatus, and a system. A first terminal apparatus and a second terminal apparatus determine, based on first configuration information, a plurality of candidate resources in a slot, and perform sidelink communication based on the candidate resources. A first symbol in any candidate resource in one slot is used to send first information. In response to a channel access moment of the first terminal apparatus being after a start moment of a first symbol in one candidate resource in a first slot, the first terminal apparatus further sends the first information based on the first symbol in another candidate resource after the channel access moment, without waiting for a next slot after the first slot. In this way, a sidelink communication delay is reduced.

Abstract: This application provides a wireless communication method and apparatus. The method includes: determining N first symbols in a first slot, where N is a positive real number greater than 1 and less than M, M is a quantity of symbols included in the first slot, M is a positive integer, a frequency domain resource corresponding to the first slot is an unlicensed spectrum, and the first symbols are unoccupied symbols in the first slot; and sending a first signal to a terminal device on the N first symbols. The first signal includes at least one of the following: a symbol copied from a second slot, a to-be-sent first transport block, or a cyclic prefix extension. The second slot is a next slot of the first slot. According to the disclosure, a channel resource in an unlicensed spectrum can be effectively occupied, thereby reducing waste of channel resources.

Abstract: A system and method includes: sending a channel state information-reference signal CSI-RS to a second terminal device, where a frequency-domain bandwidth of the CSI-RS is the same as a frequency-domain bandwidth of a resource pool, the resource pool is a time-frequency resource set included in a sidelink SL bandwidth part BWP, the resource pool includes one or more consecutive sub-channels in frequency domain, one sub-channel in the resource pool includes one or more consecutive physical resource blocks PRBs, and the resource pool is determined based on a periodic bitmap in time domain. According to the method and apparatus in the embodiments of this application, a first terminal device can obtain channel state information CSI of each sub-channel in the resource pool, and allocate a resource based on the CSI of each sub-channel in the resource pool, improving a communication capacity in an SL scenario.

Abstract: A communication method and an apparatus relate to fields such as V2X, intelligent connected vehicles, intelligent driving, and assisted driving, to resolve a technical problem that a current SL lacks an indication of an SL TCI identifier. The SL TCI identifier is able to be implemented in at least two ways. An explicit indication is able to be used. A first terminal apparatus sends first indication information to a second terminal apparatus. The second terminal apparatus determines the SL TCI identifier of the first reference signal based on the first indication information. Alternatively, a first terminal apparatus generates a first signal based on an SL TCI identifier of the first signal, and sends the first signal to a second terminal apparatus. Then, the second terminal apparatus determines the SL TCI identifier of the first signal based on the first signal.

Abstract: A configuration information indication method and apparatus, applicable to systems such as a vehicle to everything V2X communication system and a vehicle-to-vehicle V2V communication system, to resolve a problem that SL transmission causes interference to DL transmission due to relatively poor indication accuracy of UL transmission time in the conventional technology. The method includes: receiving an uplink-downlink time division duplex TDD configuration from a network device; determining, based on first periodicity information included in the uplink-downlink TDD configuration, a first subcarrier spacing SCS corresponding to the first periodicity information, where the first SCS is used to indicate a sidelink SL reference SCS; and sending indication information to a second terminal device based on the uplink-downlink TDD configuration and the first SCS, where the indication information is used to indicate uplink UL transmission time corresponding to the first periodicity information.

Abstract: Embodiments of this application provide a resource indication information transmission method, a device, and a system, which are applicable to fields such as internet of vehicles, intelligent connected vehicle, assisted driving, and intelligent driving. In an example method, a first terminal device determines X sets of candidate single-time-unit resources based on a number of sub-channels to be used by a second terminal device for physical sidelink shared channel (PSSCH) and/or physical sidelink control channel (PSCCH) transmission, and indicates, to the second terminal device, K candidate single-time-unit resources whose time domain locations are in a first time window in the X sets of candidate single-time-unit resources. The second terminal device determines a first time-frequency resource based on the K candidate single-time-unit resources. The first time window is a time window included in a selection window corresponding to at least one of the X sets of candidate single-time-unit resources.

Abstract: This application provides a configuration information indication method and an apparatus, which are applicable to fields such as vehicle to everything V2X, intelligent connected vehicles, assisted driving, and intelligent driving, to resolve an existing-technology problem that SL transmission causes interference to DL transmission, and effectively reduce signaling overheads. This method is applied to a first terminal device, and includes: receiving an uplink-downlink time division multiplex TDD configuration sent by a network device; and sending indication information to a second terminal device based on the uplink-downlink TDD configuration, where the indication information is carried on a physical sidelink broadcast channel PSBCH of a sidelink synchronization signal block S-SSB, and the indication information is used to indicate periodicity information included in the uplink-downlink TDD configuration.

Abstract: Example beam training methods and apparatus are described. In one example method, a first terminal apparatus sends a first message to a second terminal apparatus, where the first message includes a request for a first list, the first list includes an identifier of at least one sidelink synchronization signal, and the at least one sidelink synchronization signal is a sidelink synchronization signal that is not used by the second terminal apparatus within a preset time range and/or that is not used by another terminal apparatus within an area in which the second terminal apparatus is located. The first terminal apparatus receives a second message from the second terminal apparatus, where the second message includes the first list. A first sidelink synchronization signal is determined based on the identifier of the at least one sidelink synchronization signal in the first list. The first sidelink synchronization signal is used for beam training.

Abstract: The method includes: receiving, by a second electronic device, K panel specific reference signals from a first electronic device by using N panels, wherein the panel specific reference signal is related to an identifier of a panel that is of the first electronic device and that sends the panel specific reference signal, and N and K are each an integer greater than or equal to 2; and measuring, by the second electronic device, signal quality of the K panel specific reference signals.

Abstract: A first terminal apparatus sends K2 first reference signals to a second terminal apparatus in K1 directions. The first terminal apparatus determines that beams in the K1 directions all fail for N1 consecutive times. The first terminal apparatus sends P2 second reference signals to the second terminal apparatus in P1 directions. The first terminal apparatus determines, based on measurement results that are of the P2 second reference signals and that are from the second terminal apparatus, whether P1 beams corresponding to the P1 directions are available.

Abstract: This application provide a method, includes: receiving first information, where the first information is included in sidelink control information (SCI); obtaining a cyclic redundancy check, CRC, code based on the first information; and obtaining the reference signal sequence of the channel state information reference signal, CSI-RS, based on a scrambling identity, where the scrambling identity is L least significant bits of the CRC code or L most significant bits of the CRC code and L is a positive integer.

Abstract: This application provides a channel measurement method and an apparatus, which may be used in a field such as vehicle-to-everything V2X, smart internet of vehicles, autonomous driving, or an unmanned driving. In a sidelink channel report procedure, a transmit end apparatus for sidelink communication indicates one or more candidate time intervals to a receive end apparatus. The receive end apparatus may attempt to obtain an available PSSCH for sending a channel measurement report on one or more time domain resources corresponding to the one or more candidate time intervals.