A communication method and apparatus

Abstract

Embodiments of the present application provide a communication method and apparatus, which relate to fields such as V2X, intelligent connected vehicles, intelligent driving, and assisted driving, and can solve the technical problem that the current SL lacks the indication of the SL TCI identifier. There are two schemes for the indication of the SL TCI identifier: The first scheme is explicit indication. The first terminal device can send first indication information to the second terminal device, and the first indication information is used to indicate the SL TCI identifier of the first reference signal. The second terminal device can determine the SL TCI identifier of the first reference signal according to the above first indication information. The second scheme is implicit indication. The first terminal device can generate a first signal according to the SL TCI identifier of the first signal and send the first signal to the second terminal device. After that, the second terminal device can determine the SL TCI identifier of the first signal according to the first signal.

Description

[0001] This application is a divisional application. The application number of the original application is 202010462497.4, and the filing date of the original application is May 27, 2020. The entire content of the original application is incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0003] With the further development of multiple input multiple output (MIMO) technology, technologies such as multiple transmission and reception point (Multi-TRP), multiple panel (Multi-panel), and multiple beam (Multi-beam) have been proposed in the Uu interface of the new radio (NR).

[0004] When using the above MIMO technologies, the receiving end needs to be able to distinguish signals sent by different TRPs, panels, or beams. Therefore, two important concepts are used in NR, one is quasi co-located (QCL), and the other is transmission configuration indication (TCI). TCI is used in NR to indicate the QCL relationship between two reference signals (RS).

[0005] In the NR system, in addition to the Uu interface, there is also a PC5 interface, which is a communication interface between terminal devices. The transmission link in the PC5 interface is defined as a sidelink (SL). However, there is currently a lack of an indication method for SL TCI identification, which hinders the use of MIMO technologies such as multi-panel and multi-beam in the PC5 interface. Summary of the Invention

[0006] Embodiments of this application provide a communication method and apparatus to implement the indication of SL TCI identification.

[0007] In a first aspect, a communication method is provided. The execution entity of this method is a first terminal device, which can be a terminal device or a component configured in a terminal device (such as a chip, a circuit, or others). The method includes: The first terminal device sends first indication information to a second terminal device, where the first indication information is used to indicate a first sidelink transmission configuration indication (SLTCI) identifier of a first reference signal, and the first SLTCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first reference signal; The first terminal device sends the first reference signal to the second terminal device on the first channel.

[0008] Through the above SLTCI indication method, the defect that the current sidelink (SL) lacks an SLTCI identifier indication method can be remedied. Further, based on the above-provided simplified definition of the SLTCI identifier, compared with the Uu air interface, the signaling overhead of TCI indication can be reduced, and the technical problem that the TCI indication method in the Uu air interface is too complex due to too many QCL types is solved.

[0009] In a possible design, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the second-level sidelink control information.

[0010] In a possible design, the method further includes: The first terminal device determines N SL-TCI SLTCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SLTCI identifier belongs to the N SL-TCI SLTCI identifiers; The first terminal device sends first configuration information to the second terminal device, and the first configuration information is used to configure the N SL-TCI SLTCI identifiers for the second terminal device.

[0011] Through the above method, the first terminal device can determine N SL-TCI SLTCI identifiers according to factors such as the panel, transmission beam, or the number of antennas, and then the first terminal device configures the N SL-TCI SLTCI identifiers for the second terminal device. The first terminal device can configure different SLTCI identifiers for the terminal device according to its own conditions, with high adaptability and flexibility.

[0012] In a possible design, the determining of the N SL-TCI SLTCI identifiers includes:

[0013] Determining the N SL-TCISL TCI identities.

[0014] In a possible design, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0015] In a possible design, the method further includes: The first terminal device determines N SL-TCI SL TCI identities according to the configuration information of the transmission resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identity belongs to the N SL-TCI SL TCI identities.

[0016] Through the above method, the first terminal device and the second terminal device can each determine N SL-TCI SL TCI identities according to the configuration information of the transmission resource, without the need for additional signaling configuration, reducing signaling overhead.

[0017] In a second aspect, a communication method is provided. The execution subject of this method is a second terminal device, which can be a terminal device or a component configured in a terminal device (such as a chip, a circuit, or others). The method includes: The second terminal device receives first indication information from the first terminal device, where the first indication information is used to indicate a first sidelink transmission configuration indication (SL TCI) identity of a first reference signal, and the first SL TCI identity is used to indicate the channel characteristics of a first channel for transmitting the first reference signal; The second terminal device receives the first reference signal from the first terminal device on the first channel.

[0018] In a possible design, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in sidelink control information of the second level.

[0019] In a possible design, the method further includes: The second terminal device receives first configuration information from the first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identities for the second terminal device, and the first SL TCI identity belongs to the N SL-TCI SL TCI identities; The second terminal device determines the N SL-TCI SL TCI identities according to the first configuration information.

[0020] In a possible design, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0021] In a possible design, the method further includes: a second terminal device determines N SL-TCI SL TCI identifiers according to the configuration information of the receiving resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0022] In a third aspect, a communication method is provided. The execution entity of this method is a first terminal device, including: the first terminal device determines a first sidelink transmission configuration indication (SL TCI) identifier of a first signal, where the first SL TCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first signal; the first terminal device determines the first signal according to the first SL TCI identifier; the first terminal device sends the first signal to a second terminal device on the first channel.

[0023] Through the above indication method of the SL TCI identifier, not only the technical deficiency of the lack of the SL TCI identifier in the sidelink is made up, but also the signaling overhead of the TCI indication is reduced compared with the Uu air interface. Further, in this embodiment, since the first terminal device does not need to send the indication information of the SL TCI identifier, the second terminal device can determine the SL TCI identifier, and further the signaling overhead of the TCI indication can be reduced.

[0024] In a possible design, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal, and the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal is determined according to the first SL TCI identifier.

[0025] In a possible design, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0026]

[0027] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, represents an integer value obtained according to the sidelink synchronization signal block index, represents the sidelink synchronization signal identifier, n SL-TCI represents the first SL TCI identifier, and n SL-TCI is a natural number;

[0028] The above-mentioned is obtained according to the sidelink synchronization signal block index Satisfy: The i S-SSB represents the sidelink synchronization signal block index, the U is an integer greater than or equal to 0, and the mod represents the modulo operation.

[0029] In a possible design, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0030]

[0031] Among them, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the M is a positive integer, and the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0032] In a possible design, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel, and the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel is determined according to the first SLTCI identifier.

[0033] In a possible design, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0034]

[0035] Among them, the c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, the M is a positive integer, and the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0036] In a possible design, the method further includes: the first terminal device determines N SL -TCI SL TCI identifiers, the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers; the first terminal device sends first configuration information to the second terminal device, and the first configuration information is used to configure the N SL-TCI SL TCI identifiers for the second terminal device.

[0037] Through the above method, the first terminal device can determine N according to the number of panels, transmission beams, or antennas, etc. SL-TCI SL TCI identities, and then the first terminal device configures the N SL-TCI SL TCI identities for the second terminal device. The first terminal device can configure different SL TCI identities for the terminal device according to its own conditions, with high adaptability and flexibility.

[0038] In a possible design, the determination of the N SL-TCI SL TCI identities includes: the first terminal device determines the N SL-TCI SL TCI identities according to the number of panels, transmission beams, or antennas of the first terminal device.

[0039] In a possible design, the first configuration information is carried in a radio resource control message on the PC5 interface, or the first configuration information is carried in a media access control control element on the PC5 interface.

[0040] In a possible design, the method further includes: the first terminal device determines N SL-TCI SLTCI identities according to the configuration information of the transmission resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identity belongs to the N SL-TCI SLTCI identities.

[0041] Through the above method, the first terminal device and the second terminal device can each determine N SL-TCI SLTCI identities according to the configuration information of the transmission resource. There is no need to configure through additional signaling, reducing signaling overhead.

[0042] In a fourth aspect, a communication method is provided. The execution subject of this communication method is a second terminal device, including: the second terminal device receives a first signal from the first terminal device on a first channel; the second terminal device determines a first sidelink transmission configuration indication (SLTCI) identity according to the first signal, where the first SL TCI identity is used to indicate the channel characteristics of the first channel for transmitting the first signal.

[0043] In a possible design, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal. The determination of the first SL TCI identity according to the first signal includes:

[0044] Determining the first SLTCI identity according to the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal.

[0045] In a possible design, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0046]

[0047] wherein, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the represents an integer value obtained according to the sidelink synchronization signal block index, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SLTCI identifier, the n SL-TCI is a natural number;

[0048] The obtaining of the according to the sidelink synchronization signal block index satisfies: The i S-SSB represents the sidelink synchronization signal block index, the U is an integer greater than or equal to 0, and the mod represents the modulo operation.

[0049] In a possible design, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0050]

[0051] wherein, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the M is a positive integer, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, the n SL-TCI is a natural number.

[0052] In a possible design, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel, and determining the first SL TCI identifier according to the first signal includes:

[0053] Determining the first SL TCI identifier according to the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel.

[0054] In a possible design, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0055]

[0056] wherein, the c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, the M is a positive integer, the Indicates a sidelink synchronization signal identifier, where the n SL-TCI Indicates the first SL TCI identifier, where the n SL-TCI is a natural number.

[0057] In a possible design, the method further includes: The second terminal device receives first configuration information from the first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identifiers for the second terminal device, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0058] In a possible design, the first configuration information is carried in a radio resource control message on the PC5 interface, or the first configuration information is carried in a media access control control element on the PC5 interface.

[0059] In a possible design, the method further includes: The second terminal device determines N SL-TCI SLTCI identifiers according to the configuration of the receiving resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0060] In a fifth aspect, a device is provided, and the beneficial effects can be seen in the description of the first aspect. The communication device has the function of implementing the actions in the method embodiment of the first aspect above. The function can be implemented by executing corresponding hardware or software. The hardware or software includes one or more units corresponding to the above functions.

[0061] In a sixth aspect, a device is provided, and the beneficial effects can be seen in the description of the second aspect. The communication device has the function of implementing the actions in the method embodiment of the second aspect above. The function can be implemented by executing corresponding hardware or software. The hardware or software includes one or more units corresponding to the above functions.

[0062] In a seventh aspect, a device is provided, and the beneficial effects can be seen in the description of the third aspect. The communication device has the function of implementing the actions in the method embodiment of the first aspect above. The function can be implemented by executing corresponding hardware or software. The hardware or software includes one or more units corresponding to the above functions.

[0063] In an eighth aspect, a device is provided, and the beneficial effects can be seen in the description of the fourth aspect. The communication device has the function of implementing the actions in the method embodiment of the second aspect above. The function can be implemented by executing corresponding hardware or software. The hardware or software includes one or more units corresponding to the above functions.

[0064] In a ninth aspect, a device is provided. The device can be the terminal device in the above method embodiments, or a chip disposed in the terminal device. The device includes a communication interface and a processor. Optionally, a memory is further included. The memory is used to store computer programs or instructions. The processor is coupled to the memory and the communication interface. When the processor executes the computer programs or instructions, the communication device is enabled to execute the methods performed by the first terminal device or the second terminal device in the above aspects.

[0065] In a tenth aspect, a computer program product is provided. The computer program product includes computer program code. When the computer program code runs, the methods performed by the first terminal device or the second terminal device in the above aspects are executed.

[0066] In an eleventh aspect, the present application provides a chip system. The chip system includes a processor for implementing the functions of the first terminal device or the second terminal device in the methods of the above aspects. In a possible design, the chip system further includes a memory for storing program instructions and / or data. The chip system can be composed of chips or can include chips and other discrete devices.

[0067] In a twelfth aspect, the present application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program runs, the methods performed by the first terminal device or the second terminal device in the above aspects are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a schematic diagram of the basic architecture of the Multi-TRP technology provided by the embodiments of the present application;

[0069] Figure 2 It is a schematic diagram of a multi-panel provided by the embodiments of the present application;

[0070] Figure 3 It is a schematic diagram of the multi-beam technology provided by the embodiments of the present application;

[0071] Figure 4 It is a schematic diagram of the QCL relationship provided by the embodiments of the present application;

[0072] Figure 5 It is a schematic diagram of the network architecture provided by the embodiments of the present application;

[0073] Figure 6 It is a schematic diagram of the application scenario provided by the embodiments of the present application;

[0074] Figure 7 It is a schematic diagram of the flowchart of the communication method provided by the embodiments of the present application;

[0075] Figure 8 It is a schematic flowchart of the communication method provided by the embodiment of the present application;

[0076] Figure 9 It is a schematic flowchart of the communication method provided by the embodiment of the present application;

[0077] Figure 10 It is a schematic flowchart of the panel selection provided by the embodiment of the present application;

[0078] Figure 11 It is a schematic flowchart of the panel selection provided by the embodiment of the present application;

[0079] Figure 12 It is a schematic flowchart of the communication method provided by the embodiment of the present application;

[0080] Figure 13 It is a schematic flowchart of the panel selection provided by the embodiment of the present application;

[0081] Figure 14 It is a schematic structural diagram of the device provided by the embodiment of the present application;

[0082] Figure 15 It is a schematic structural diagram of the device provided by the embodiment of the present application. Detailed implementation manners

[0083] Some communication terms or terminologies used in the embodiments of the present application are explained below, and these communication terms or terminologies also form part of the invention content of the present application.

[0084] I. Terminal device

[0085] A terminal device, which can be simply referred to as a terminal, is a device with wireless transceiver functions. The terminal device can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, satellites, etc.). The terminal device can be a mobile phone, a pad, a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, and can also include user equipment (UE), etc. The terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication functions, a computing device or other processing devices connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in the future fifth generation (5G) network or a terminal device in the future evolved public land mobile network (PLMN), etc. The terminal device is sometimes also referred to as a terminal, an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a mobile platform, a remote station, a remote terminal device, a mobile device, a UE terminal device, a terminal device, a wireless communication device, a UE agent or a UE device, etc. The terminal device can also be fixed or mobile. The embodiments of the present application do not limit this.

[0086] In the embodiments of the present application, the device for implementing the functions of the terminal may be the terminal; or it may be a device capable of supporting the terminal to implement the functions, such as a chip system, and this device may be installed in the terminal. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided in the embodiments of the present application, taking the device for implementing the functions of the terminal as the terminal, and taking the terminal as the UE as an example, the technical solutions provided in the embodiments of the present application are described.

[0087] II. Sidelink (SL)

[0088] The sidelink may also be referred to as a side link or a lateral link, etc. The communication interface of the sidelink may be referred to as the PC5 interface. The sidelink is used for communication between terminal devices and may include a Physical Sidelink Shared Channel (PSSCH) and a Physical Sidelink Control Channel (PSCCH). Among them, the PSSCH may be used to carry sidelink data (SL data), and the PSCCH may be used to carry sidelink control information (SCI), and the SCI may also be referred to as a sidelink scheduling assignment (SL SA). The SL SA is information related to data scheduling. For example, the SL SA includes information such as resource allocation and / or modulation and coding scheme (MCS) of the PSSCH. Optionally, the sidelink communication may further include: a Physical Sidelink Feedback Channel (PSFCH). The Physical Sidelink Feedback Channel may also be simply referred to as the sidelink feedback channel. Among them, the sidelink feedback channel may be used to transmit sidelink feedback control information (SFCI), and the sidelink feedback control information may include at least one of information such as channel state information (CSI) and hybrid automatic repeat request (HARQ) information. Among them, the HARQ information may include acknowledgement (ACK) or negative acknowledgement (NACK), etc.

[0089] III. Uu air interface

[0090] The Uu air interface can be understood as the interface between a general terminal device and a network device (universal UE to network interface), and the Uu air interface is used for communication between the terminal device and the network device. The transmission of the Uu air interface can include uplink transmission and downlink transmission.

[0091] Among them, uplink transmission refers to the terminal device sending information to the network device, and the information transmitted uplink can be referred to as uplink information or uplink signal. The uplink information or uplink signal can include one or more of an uplink data signal, an uplink control signal, and a sounding reference signal (SRS). The channel used to transmit the uplink information or uplink signal is called the uplink channel, and the uplink channel can include one or more of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH). The PUSCH is used to carry uplink data, and the uplink data can also be referred to as uplink data information. The PU CCH is used to carry the uplink control information (UCI) fed back by the terminal device. By way of example, the UCI can include one or more of the channel state information (CSI), ACK, and NACK fed back by the terminal device.

[0092] Downlink transmission refers to the network device sending information to the terminal device, and the information transmitted downlink can be downlink information or downlink signal. The downlink information or downlink signal can include one or more of a downlink data signal, a downlink control signal, a channel state information reference signal (CSI-RS), and a phase tracking reference signal (PTRS). The channel used to transmit the downlink information or downlink signal is called the downlink channel, and the downlink channel can include one or more of a physical downlink shared channel (PDSCH) and a physical downlink control channel (PDCCH). The PDCCH is used to carry downlink control information (DCI), and the PDSCH is used to carry downlink data, and the downlink data can also be referred to as downlink data information.

[0093] IV. SL CSI-RS Pattern

[0094] The SL CSI-RS pattern in the embodiments of the present application may be similar to the CSI-RS resources in the Uu air interface. One SL CSI-RS pattern corresponds to one SL CSI-RS configuration, and the configuration parameters may be the number of ports, frequency-domain position, time-domain position, etc., without limitation.

[0095] In the embodiments of the present application, one or more SL CSI-RS patterns may be configured for the first terminal device and the second terminal device. The patterns corresponding to the SL CSI-RS transmitted by different panels, transmission beams, or antennas may be the same or different.

[0096] V. Beam

[0097] The manifestation of the beam in the protocol may be a spatial domain filter, or a spatial filter or a spatial parameter, etc. The beam for transmitting signals may be called a transmission beam (Tx beam), or may be called a spatial domain transmission filter, or may be called a spatial transmission parameter, etc. The beam for receiving signals may be called a reception beam (Rx beam), or may be called a spatial domain receive filter, or may be called a spatial RX parameter, etc.

[0098] The transmission beam may refer to the distribution of signal strength formed in different directions in space after the signal is transmitted by the antenna, and the reception beam may refer to the distribution of signal strength of the wireless signal received by the antenna in different directions in space.

[0099] In addition, the beam may be a wide beam, a narrow beam, or other types of beams, etc. The technology for forming the beam may be beamforming technology or other technologies, without limitation. For example, the beamforming technology may specifically be digital beamforming technology, analog beamforming technology, or hybrid digital / analog beamforming technology, etc.

[0100] Optionally, multiple beams with the same or similar communication characteristics can be regarded as one beam. One beam can include one or more antenna ports for transmitting data channels, control channels, sounding signals, etc. One or more antenna ports forming one beam can also be regarded as an antenna port set.

[0101] Generally, a beam corresponds to a resource. For example, when performing beam measurement, the transmitting end can measure different beams through different resources, and the receiving end can feedback the measured resource quality, so that the transmitting end can determine the quality of the corresponding beam. In the embodiments of the present application, unless otherwise specified, a beam refers to the transmitting beam of the transmitting end. In beam measurement, each beam corresponds to a resource, so the beam corresponding to the resource can be uniquely identified by the index of the resource.

[0102] In the description of the present application, unless otherwise specified, " / " means that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B; "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. Also, in the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit to be different.

[0103] In addition, the network architecture and service scenarios described in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0104] In the past few decades, wireless communication systems have undergone a technological evolution from the first-generation analog communication to the fifth-generation new radio (NR). With this evolution, the resources used by wireless communication systems have gradually developed from two dimensions, namely the time domain and the frequency domain, to three dimensions, namely the time domain, the frequency domain, and the spatial domain. The use of spatial domain resources stems from the development of multiple input multiple output (MIMO) systems. In a MIMO system, the transmitting end can use multiple antennas to send data, and the receiving end can also use multiple antennas to receive data, thereby enabling the parallel transmission of multiple spatial data streams between the transmitting end and the receiving end. On the one hand, this improves the communication speed, and on the other hand, it enhances the communication reliability. With the further evolution of MIMO technology, technologies such as multiple transmission and reception point (Multi-TRP), multiple panel (Multi-panel), and multiple beam (Multi-beam) have been proposed in the Uu air interface of NR and are considered important technological development directions.

[0105] The basic architecture of the Multi-TRP technology is as Figure 1 shown. Multiple transmission and reception points (TRPs) can simultaneously transmit data to a terminal device (e.g., UE), thereby improving the communication rate and reliability. A possible implementation of a TRP is a 5G base station.

[0106] The multi-panel technology allows multiple panels to exist on the terminal device side and the network device side, with one or more antennas installed on each panel. On the network device side, using multiple panels can avoid the overhead and power consumption issues when deploying a large-scale MIMO system. On the terminal device side, since the panel generally has directivity, using multiple panels can cover more spatial directions, thereby improving the communication reliability. As Figure 2 shown, the left side is a top view of four panels, and the right side is a plan view of a single panel. See Figure 2 the right side shown. Four dual-polarized antennas can be installed on a single panel, and the horizontal distance between every two dual-polarized antennas is 0.5λ, where λ represents the wavelength of the signal. When the terminal device uses four panels, it can send data in different directions and also receive data from different directions.

[0107] Multi-beam technology is generally applied to high frequency bands above 20 GHz. Through beamforming technology, network devices and terminal devices can form beams in one or more spatial directions, improving the communication rate and reliability through transmission and reception in specific directions. As Figure 3 shown, the network device can transmit data to the terminal device using transmission beams in different directions, and the terminal device can also receive data using reception beams in different directions.

[0108] When using the above MIMO technology, the receiving end needs to be able to distinguish signals transmitted by different TRPs, panels, or beams. Therefore, two important concepts are used in NR, one is quasi co-located (QCL), and the other is transmission configuration indication (TCI).

[0109] Before giving the definition of QCL, it is necessary to first explain the antenna port. The antenna port is a logical concept widely used in the 3rd generation partnership project (3GPP), and its definition is as follows: The channel characteristics experienced by the signal on a certain antenna port can be deduced from the channel characteristics experienced by another signal transmitted from the same antenna port. It should be noted that the antenna port is different from the physical antenna actually used. Multiple physical antennas can correspond to the same antenna port, and one physical antenna can also correspond to multiple antenna ports.

[0110] Based on the antenna port, the definition of QCL is as follows: If the channel characteristics experienced by the signal on a certain antenna port can be deduced from the channel characteristics experienced by the signal on another antenna port, then the two antenna ports are considered to be QCL. At the same time, the reference signals (RS) transmitted on these two antenna ports also have a QCL relationship. For example, if antenna port 1 and antenna port 2 are QCL, antenna port 1 is used to transmit the first RS, and antenna port 2 is used to transmit the second RS, then it can be considered that the first RS and the second RS also have a QCL relationship.

[0111] TCI is used in NR to indicate the QCL relationship between two RSs. Suppose the two RSs are the first RS and the second RS respectively. The network device can configure the TCI state for the first RS through radio resource control (RRC) signaling. As Figure 4As shown, the terminal device can determine a second RS that has a QCL relationship with a first RS in a certain QCL type through the TCI state. Then, the terminal device can deduce the channel characteristics of the first RS through the channel characteristics of the second RS, so as to better receive the first RS. Optionally, the second RS can be a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB), etc.

[0112] In the NR system, in addition to the Uu air interface, there is also a PC5 interface, and the PC5 interface is a communication interface between terminal devices. The transmission link in the PC5 interface is a sidelink. However, currently, there is a lack of a configuration and indication method for the SL TCI identifier in the standard, which hinders the use of MIMO technologies such as multi-panel and multi-beam in the PC5 interface.

[0113] In the following description, taking the network device as the gNB and the terminal device as the UE as an example, the configuration and indication method of TCI in the Uu air interface, and the problems existing in directly applying the TCI configuration and indication method in the Uu air interface to the PC5 interface are described in detail.

[0114] In the Uu air interface, the gNB can configure multiple TCI states for the UE through RRC signaling, and then indicate the TCI state of a certain RS through a media access control (MAC) control element (CE) or downlink control information (DCI).

[0115] In the Uu air interface, the information element (IE) of the TCI state configured through RRC signaling may include at least one of the following information elements:

[0116] 1. TCI state identifier (tci-StateId): Gives the identifier (ID) of the TCI state;

[0117] 2. QCL of type 1 (qcl-Type1): Gives a QCL relationship and the corresponding RS. qcl-Type1 continues to point to the QCL-Info information element, and the specific parameters of this QCL type are given by this QCL-Info information element.

[0118] 3. qcl-Type2: Another QCL relationship and its corresponding RS are given. qcl-Type2 continues to point to the QCL-Info cell, and the specific parameters of this QCL type are given by this QCL-Info cell.

[0119] The QCL-Info cell further includes the following two mandatory cells, which are explained as follows:

[0120] 1. referenceSignal: The RS corresponding to the QCL relationship is given, which can be a CSI-RS resource with a certain ID, or an SSB with a certain index. It should be noted that the CSI-RS can be represented as a CSI-RS resource, and one CSI-RS resource corresponds to a configuration of CSI-RS. The configuration parameters of CSI-RS can include parameters such as resource ID and resource mapping. The resource mapping parameters can further include parameters such as the number of ports, frequency-domain position, and time-domain position.

[0121] 2. qcl-Type: The QCL type corresponding to the QCL relationship is given, which may be any one of {typeA, typeB, typeC, typeD}.

[0122] Among them, a single QCL type corresponds to a combination of one or more channel characteristics. The possible channel characteristics include Doppler frequency shift, Doppler spread, average delay, delay spread, and spatial reception parameters, etc. The combination of channel characteristics corresponding to each QCL type is briefly described as follows: typeA: {Doppler frequency shift, Doppler spread, average delay, delay spread}; typeB: {Doppler frequency shift, Doppler spread}; typeC: {Doppler frequency shift, average delay}; typeD: {spatial reception parameters}.

[0123] When two antenna ports have a QCL relationship with a certain QCL type, the channel characteristics experienced by the signals on the two antenna ports are considered to be the same in the channel characteristics corresponding to this QCL type. Taking typeD as an example, this QCL type only corresponds to the spatial reception parameter. Therefore, when two antenna ports have a QCL relationship with typeD, the channels experienced by the signals on the two antenna ports are considered to have the same spatial reception parameter.

[0124] As can be seen from the above, in the Uu air interface, up to 4 types of QCL are considered. This is to enable the UE to determine the QCL types of the RSs of multiple transmitting devices in scenarios such as handover between gNBs and multi-TRP. However, for sidelink (SL) scenarios such as vehicle-to-everything (V2X) communication and device-to-device (D2D) communication, the scenario of multiple transmitting UE can be simply decomposed into multiple unicast links each containing only a single transmitting UE and a single receiving UE. Each unicast link is distinguished by the IDs of the transmitting UE and the receiving UE. Therefore, in the SL scenario, only the QCL relationship between the RSs in each unicast link needs to be concerned about. For this reason, the TCI definition needs to be simplified in the PC5 interface to reduce the signaling overhead for the configuration and indication of TCI states.

[0125] Based on the above, the embodiments of this application redefine the SL TCI identifier, and define the SL TCI identifier as the identifier (ID) of the channel characteristics experienced by the signal on a certain antenna port on the SL. The UE can consider that the channel characteristics experienced by the signals with the same SL TCI identifier are the same. Optionally, the channel characteristics may refer to spatial reception parameters, or rather, the SL TCI identifier only considers the QCL type D (type D) in the Uu air interface. For example, if the SL TCI identifier of the physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) is 0, and the SL TCI identifier of the sidelink channel state information reference signal (SL CSI-RS) is also 0, then the UE can consider that the spatial reception parameters experienced by the PSSCH DMRS and the SL CSI-RS are the same. The same spatial reception parameters can be considered that the PSSCH DMRS and the SL CSI-RS are transmitted through the same panel or beam. It should be noted that the name of the SL TCI identifier can also be replaced with QCL identifier (QCL ID) or QCL number (QCL index), etc., without limitation.

[0126] In the embodiments of this application, by simplifying the definition of the SL TCI identifier, compared with the Uu air interface, the signaling overhead required for the configuration and indication of TCI is reduced, and the technical problem of the overly complex configuration and indication method caused by too many QCL types in the Uu air interface is solved.

[0127] Optionally, the value range of any SL TCI identifier in the embodiments of this application can be an integer value in, where is a positive integer greater than or equal to 1, and is used to represent the maximum number of SL TCI identifiers. Optionally, It can be one of {8, 16, 32, 64, 128}. It should be noted that the TCI in the Uu air interface is manifested as a TCI state, and the TCI state gives the identifier of the TCI state and the RS and QCL types corresponding to the QCL relationship. In the embodiments of the present application, the TCI in the PC5 interface is manifested as a TCI identifier, and the QCL relationship is not given, thus simplifying the design and saving signaling overhead.

[0128] In addition, the signaling for configuring and indicating the TCI state for implementing RS in the Uu air interface includes signaling such as RRC, MAC CE, and DCI. This is too complex for the configuration and indication of TCI in the SL scenario. Additionally, there is no RRC signaling in the PC5 interface, only PC5-RRC signaling, and there is no similar signaling element for configuring the TCI state in the PC5-RRC signaling in SL as in the Uu air interface. The MAC CE in the PC5 interface also does not have a similar MAC CE for activating multiple TCI states in the Uu air interface. Therefore, in the PC5 interface, the configuration and indication of TCI cannot be achieved by the method of the Uu air interface.

[0129] Based on the above, the embodiments of the present application provide a communication method and apparatus, which can solve the technical problem that the current SL lacks the configuration and indication of the SL TCI identifier. The indication of the SL TCI identifier includes two schemes: The first scheme is explicit indication. The first terminal device can send first indication information to the second terminal device, and the first indication information is used to indicate the SL TCI identifier of the first reference signal. The second terminal device can determine the SL TCI identifier of the first reference signal according to the above first indication information. The second scheme is implicit indication. The first terminal device can generate a first signal according to the SL TCI identifier of the first signal and send the first signal to the second terminal device. After that, the second terminal device can determine the SL TCI identifier of the first signal according to the first signal. The configuration of the SL TCI identifier includes two schemes: The first scheme is that the first terminal device determines multiple SL TCI identifiers according to the number of panels, transmission beams, or antennas; then, the first terminal device can send the configuration information of the above multiple SL TCI identifiers to the second terminal device. The second scheme is that multiple SL TCI identifiers are pre-configured in the resource pool, and the first terminal device and the second terminal device respectively determine multiple SL TCI identifiers according to the configuration information of the corresponding resource pool.

[0130] The communication method and apparatus provided by the embodiments of the present application can be applied in a network architecture. Such as Figure 5As shown, a network architecture is provided, including a first terminal device 501 and a second terminal device 502. The first terminal device 501 and the second terminal device 502 can perform sidelink communication through a sidelink to transmit sidelink information. The transmitted sidelink information may include data and scheduling assignment (SA), etc. Optionally, the sidelink information may further include channel state information (CSI) and hybrid automatic repeat request (HARQ) information, etc. The HARQ information may specifically be acknowledgement (ACK) or negative acknowledgement (NACK), etc.

[0131] Optionally, in Figure 5 the network architecture shown, a network device 503 may further be included. The network device 503 may be an access network device. The terminal device 501 and / or the terminal device 502 can communicate with the network device 503 through the Uu air interface. The communication of the Uu air interface includes uplink transmission and downlink transmission. Uplink transmission refers to the terminal device 501 and / or the terminal device 502 sending an uplink signal or uplink information to the network device 503. Downlink transmission refers to the network device 503 sending a downlink signal or downlink information to the terminal device 501 and / or the terminal device 502.

[0132] The communication method and device provided by the embodiments of this application can be applied to the SL scenario, and the SL scenario may include vehicle to everything (V2X) or device-to-device (D2D), etc. scenarios. As Figure 6 shown, taking the vehicle-to-vehicle (V2V) communication scenario as an example, the transmitting UE and the receiving UE can be respectively described as the first terminal device and the second terminal device, Figure 6 and the transmitting UE and the receiving UE in Figure 6 are both vehicle UEs. The transmitting UE and the receiving UE in the actual application scenario can be terminal devices in any form. The above scenario further includes a transmitting beam. The transmitting beam refers to a directional radiation pattern formed by the transmitting UE making the transmitted signal through technologies such as multi-panel or multi-beam, and is represented by a water droplet shape in

[0133] As Figure 7As shown in the figure, a communication method is provided. This communication method can correspond to the above-mentioned first explicit indication scheme, and the execution entities of this method are the first terminal device and the second terminal device. It can be understood that the first terminal device and the second terminal device can be terminal devices, or components located in terminal devices (such as chips, circuits, or others, etc.). The process includes:

[0134] S701: The first terminal device sends the first indication information to the second terminal device. Correspondingly, the second terminal device receives the first indication information from the first terminal device.

[0135] S702: The first terminal device sends the first RS to the second terminal device on the first channel. Correspondingly, the second terminal device receives the first RS from the first terminal device on the first channel. Among them, the first indication information is used to indicate the first SL TCI identifier of the first RS, and the first SL TCI identifier is used to indicate the channel characteristics of the first channel for transmitting the first RS, or the first SL TCI identifier is used to indicate the channel characteristics experienced by the first RS. It can be understood that since the first terminal device uses different panels, transmission beams, or antennas to send the first RS, the channel characteristics experienced by the first RS are not the same. Therefore, the SL TCI identifier can be used to identify different panels, transmission beams, or antennas, etc. In a possible implementation manner, after receiving the first indication information, the second terminal device can determine the SL TCI identifier of the first RS according to the first indication information. Further, the second terminal device can determine the panel, transmission beam, or antenna, etc. of the first terminal device for sending the first RS according to the SL TCI identifier of the first RS. It should be noted that the first terminal device can execute the above S701 and the above S702 simultaneously, that is, the first terminal device can send the first indication information and the first RS to the second terminal device simultaneously. Or, the first terminal device can send the first indication information and the first RS in sequence. For example, the first terminal device can first send the first indication information and then send the first RS, or first send the first RS and then send the first indication information, etc., which is not limited.

[0136] Optionally, the first reference signal may include PSSCH DMRS, or physical sidelink control channel (PSCCH) DMRS, or SL CSI-RS, and the first indication information in the above S701 may be carried in the second-level SCI (2 nd stage SCI).

[0137] It should be understood that the SCI in the sidelink may include the first-level SCI (1 stThe first-level SCI and the second-level SCI. Among them, the first-level SCI is carried in the PSCCH, and its main function is to schedule the corresponding PSSCH and the second-level SCI; the second-level SCI is carried in the PSSCH, and its main function is to demodulate and decode the corresponding PSSCH and / or control the HARQ and CSI processes.

[0138] For the indication method of the SL TCI identification of PSSCH DMRS and / or PSCCH DMRS, in a possible implementation, the first terminal device may send first indication information to the second terminal device, and the first indication information may be used to indicate the SL TCI identification of PSSCH DMRS and / or PSCCH DMRS. The first indication information may be carried in the M bits of the second-level SCI, where M is a positive integer. The second terminal device may determine the SL TCI identification of PSSCH DMRS and / or PSCCH DMRS according to the first indication information. Optionally, the M may be a positive integer defined by the standard. For example, M may be one of {1, 2, 3, 4, 5, 6}. Or, the M may be a positive integer obtained according to the number N of the configured SL TCI identifications SL-TCI obtained. For example, M may satisfy:

[0139] For the indication method of the SL TCI identification of SL CSI-RS, in a possible implementation, the first terminal device may configure an SL CSI-RS pattern, and the first terminal device may send first indication information to the second terminal device, and the first indication information is used to indicate the SL TCI identification of the SL CSI-RS. The first indication information may be carried in the M bits of the second-level SCI, where M is a positive integer. The receiving UE may determine the SL TCI identification of the SL CSI-RS according to the first indication information. Similarly, the M may be a positive integer defined by the standard. For example, M may be one of {1, 2, 3, 4, 5, 6}. Or, the M may be a positive integer obtained according to the number N of the configured SL TCI identifications SL-TCI obtained. For example, the M satisfies: Optionally, only when the first terminal device triggers channel measurement through the second-level SCI, the first terminal device carries the indication information of the above SL TCI identification in the second-level SCI, otherwise the indication information of the above SL TCI identification is no longer carried in the second-level SCI.

[0140] In the embodiments of the present application, by using the above-provided method for indicating the SL TCI identifier, the defect that the current SL lacks a method for indicating the SL TCI identifier can be remedied. Further, based on the above-provided definition of the simplified SL TCI identifier, compared with the Uu air interface, the signaling overhead of TCI indication can be reduced, and the technical problem that the TCI indication method in the Uu air interface is too complex due to too many QCL types is solved.

[0141] As Figure 8 shown, a communication method is provided. This communication method can correspond to the above-mentioned second implicit indication scheme, and the execution entities of this method are a first terminal device and a second terminal device. It can be understood that the first terminal device and the second terminal device can be terminal devices, or components located in the terminal device (such as chips, circuits, or others, etc.). The process includes:

[0142] S801: The first terminal device determines a first SL TCI identifier of a first signal, where the first SL TCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first signal, or the first SL TCI identifier is an identifier of the channel characteristics experienced by the channel for transmitting the first signal.

[0143] S802: The first terminal device determines the first signal according to the first SL TCI identifier.

[0144] S803: The first terminal device sends the first signal to the second terminal device on the first channel. Correspondingly, the second terminal device receives the first signal from the first terminal device on the first channel.

[0145] S804: The second terminal device determines the first SL TCI identifier according to the first signal. Optionally, since the first signal is transmitted using different panels, beams, or antennas, the channel characteristics experienced by the first signal are not the same. Therefore, the SL TCI identifier can be used to identify different panels, beams, or antennas. In a possible implementation manner, after determining the SL TCI identifier of the first signal, the second terminal device can further determine the panel, beam, or antenna, etc. that transmits the first signal according to the SL TCI identifier of the first signal.

[0146] In a possible implementation, the first signal may be a sidelink synchronization signal block (S-SSB), and the S-SSB includes physical sidelink broadcast channel (PSBCH) DMRS. The initialization parameters of the sequence of the PSBCH DMRS are generated according to the first SL TCI identification. A specific implementation of the above S802 may be: the first terminal device generates the initialization parameters of the sequence of the PSBCH DMRS according to the first SL TCI identification; the first terminal device generates the PSBCH DMRS sequence according to the initialization parameters of the sequence of the PSBCH DMRS. A specific implementation of the above S804 may be: the second terminal device determines the initialization parameters of the PSBCH DMRS sequence according to the received PSBCH DMRS; the second terminal device determines the first SL TCI identification according to the initialization parameters of the PSBCH DMRS sequence.

[0147] Optionally, the initialization parameters of the sequence of the PSBCH DMRS may satisfy:

[0148]

[0149] The c init represents the initialization parameters of the sequence of the PSBCH DMRS, and the represents an integer value obtained according to the S-SSB index (i S-SSB ), the represents the sidelink synchronization signal identification (SLSSID), and the n SL-TCI represents the first SL TCI identification, and n SL-TCI is an integer satisfying 0 ≤ n SL-TCI ≤ N S L-TCI -1. Further, optionally, the process of obtaining the integer value i S-SSB according to the S-SSB index i S-SSB satisfies: i S-SSB = i S-SSB mod 2 U , where the mod represents the modulo operation, and U is an integer greater than or equal to 0. For example, U is one of {1, 2, 3, 4}, and preferably U = 3.

[0150] Alternatively, the initialization parameters of the sequence of the PSBCH DMRS may satisfy:

[0151]

[0152] Among them, c init represents the initialization parameter of the sequence of the PSBCH DMRS, represents the SL SSID, n SL-TCI represents the first SL TCI identifier, n SL-TCI is an integer satisfying 0 ≤ n SL-TCI ≤ N SL-TCI −1, and M is a positive integer. The M can be a positive integer defined by the standard. For example, M is one of {1, 2, 3, 4, 5, 6}. Or, the M is a positive integer obtained according to the number N SL-TCI of the configured SL TCI identifiers. For example,

[0153] In another possible implementation, the first signal can be the S-SSB, and the S-SSB can also include the PSBCH. The initialization parameter of the scrambling sequence of the PSBCH is determined according to the first SL TCI identifier. A specific implementation of the above S802 can be: The first terminal device determines the scrambling sequence according to the initialization parameter of the scrambling sequence of the encoded bits in the PSBCH; and uses the scrambling sequence to scramble the PSBCH. A specific implementation of the above S804 can be: The second terminal device descrambles the PSBCH to determine the scrambling sequence of the encoded bits of the PSBCH; the second terminal device determines the initialization parameter of the scrambling sequence in the PSBCH according to the scrambling sequence of the encoded bits of the PSBCH; further, according to the initialization parameter of the scrambling sequence, the first SL TCI identifier is determined.

[0154] Optionally, the initialization parameter of the scrambling sequence of the PSBCH satisfies:

[0155]

[0156] Among them, the c init represents the initialization parameter of the scrambling sequence of the PSBCH, and the represents the SL SSID, and the n SL-TCI represents the first SL TCI identifier, n SL-TCI is an integer satisfying 0 ≤ n SL-TCI ≤ N SL-TCI −1, and M is a positive integer. The M can be a positive integer defined by the standard. For example, M is one of {1, 2, 3, 4, 5, 6}. Or, the M is a positive integer obtained according to the number N SL-TCI of the configured SL TCI identifiers. For example,

[0157] In the embodiments of the present application, through the above-mentioned indication method of the SLTCI identifier, not only the technical deficiency of the lack of the SL TCI identifier in the SL is made up, but also the signaling overhead of the TCI indication is reduced compared with the Uu air interface. Further, in this embodiment, since the first terminal device does not need to send the indication information of the SLTCI identifier, the second terminal device can determine the SL TCI identifier, and further the signaling overhead of the TCI indication can be reduced.

[0158] The embodiments of the present application also provide a communication method, and by using this communication method, the SLTCI identifier can be configured for the first terminal device and / or the second terminal device.

[0159] In a possible implementation manner, the first terminal device can determine N SL-TCI SL-TCI identifiers, and send first configuration information to the second terminal device, where the first configuration information is used to configure N SL-TCI SL-TCI identifiers for the second terminal device. Optionally, the first configuration information can be carried in the PC5-RRC signaling, or in the MAC CE of the PC5 interface. N SL-TCI is a positive integer greater than or equal to 1 and less than or equal to , and the N SL-TCI SL-TCI identifiers represent the number of SL TCI identifiers that can be used for the first terminal device to send each RS.

[0160] Optionally, N SL-TCI can be obtained according to the number of panels that are activated or all of the first terminal device. For example, if the first terminal device has 4 panels, then the first terminal device configures N SL-TCI = 4 SL-TCI identifiers. Further, when there is only one antenna on each panel, the number of panels is equivalent to the number of antennas at this time. Or, N SL-TCI can be determined according to the number of transmission beams supported by the first terminal device. For example, if the first terminal device supports 32 transmission beams, then the first terminal device can configure N SL-TCI = 32 SL-TCI identifiers.

[0161] In another possible implementation manner, N SL-TCI SL-TCI identifiers can be configured in a resource pool, where N SL-TCI is a positive integer greater than or equal to 1 and less than or equal to , and N SL-TCIThe number of SL-TCI identifiers indicates the number of SL TCI identifiers that can be used by any transmitting device in the resource pool to transmit each RS. The resource pool is a set of time-frequency resources available for SL transmission, and its specific form can be a set corresponding to multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple consecutive physical resource blocks (PRBs) in the frequency domain. A single PRB includes 12 sub-carriers in the frequency domain. The resource pool can be specifically a transmission resource pool or a reception resource pool. Correspondingly, the first terminal device can determine N SL-TCI SL-TCI identifiers according to the configuration information of the transmission resource pool. The second terminal device can determine N SL-TCI SL-TCI identifiers according to the configuration information of the reception resource pool.

[0162] In the embodiments of the present application, through the above-mentioned SL TCI identifier configuration method, the technical deficiency of the lack of SL TCI identifiers in SL is made up for. And based on the proposed simplified definition of SL TCI identifiers, compared with the Uu air interface, the signaling overhead of TCI configuration can be reduced, and the technical problem of the overly complex TCI configuration method due to too many QCL types in the Uu air interface is solved.

[0163] It should be noted that the above-mentioned SL TCI identifier configuration method and the above-mentioned SL TCI identifier indication method can be used in combination or separately, without limitation.

[0164] As Figure 9 shown, a communication method is provided. This communication method can be an example of the combined use of the above-mentioned SL TCI identifier configuration method and the SL TCI identifier indication method. In this process, the first terminal device is used as the transmitting UE and the second terminal device is used as the receiving UE for illustration. This process includes:

[0165] S901: The transmitting UE determines the configuration of the SL TCI identifier, and the receiving UE determines the configuration of the SL TCI identifier.

[0166] In a possible implementation, the transmitting UE configures N SL-TCI SL-TCI identifiers and sends configuration information to the receiving UE. The configuration information is used to configure N SL-TCI SL-TCI identifiers. The configuration information is carried in the PC5-RRC signaling or the MAC CE. N SL-TCI is a positive integer less than or equal to . Or, configure N in the resource pool (resource pool)SL-TCI SL-TCI identities. The transmitting UE determines N SL-TCI SL-TCI identities according to the configuration information of the resource pool. The receiving UE determines N SL-TCI SL-TCI identities.

[0167] In the embodiments of the present application, the transmitting UE may use an explicit indication method or an implicit indication method to indicate the SL TCI identity of the first RS. If the transmitting UE uses the explicit indication method to indicate the SL TCI identity of the first RS. Then, optionally, Figure 9 In the process shown, it may include: S902: The transmitting UE sends first indication information to the receiving UE, where the first indication information is used to indicate the SL TCI identity of the first RS, and the first RS is any RS sent by the transmitting UE.

[0168] When the first RS is PSSCH DMRS, and / or, PSSCH DMRS, the indication method of the SL TCI identity may be as follows: The transmitting UE sends first indication information to the receiving UE, where the first indication information is used to indicate the SL TCI identity of PSSCH DMRS, and / or, PSCCH DMRS. The first indication information may be carried in the M bit of the second-level SCI, and M is a positive integer. The receiving UE can determine the SL TCI identity of PSSCH DMRS, and / or, PSCCH DMRS through the first indication information. Regarding M, reference can be made to the description in the above Figure 7 process, and details will not be described here.

[0169] When the first RS is SLCSI-RS, the indication method of the SL TCI identity may be as follows: The transmitting UE configures the SLCSI-RS pattern, and the transmitting UE sends first indication information to the receiving UE, where the indication information is used to indicate the SL TCI identity of the first SLCSI-RS. The first indication information is carried in the M bit of the second-level SCI, and M is a positive integer. The receiving UE determines the SL TCI identity of SL CSI-RS through the first indication information.

[0170] When the first RS is S-SSB, the SL TCI identity may adopt an implicit indication method. The transmitting UE may carry the SL TCI identity of the above S-SSB in the initialization parameter c init of the PSBCH DMRS sequence, or carry it in the initialization parameter c init of the scrambling sequence of the encoded bits in PSBCH. For the specific carrying method, reference can be made to the description in the above Figure 8 shown process, and details will not be described here.

[0171] S903: The transmitting UE sends the first RS to the receiving UE.

[0172] It should be noted that the transmitting UE can execute step S902 and step S903 simultaneously, that is, the transmitting UE can simultaneously send the first RS to the receiving UE and the first indication information of the SL TCI identifier of the first RS. Alternatively, the transmitting UE can execute step S902 and step S903 in sequence. For example, the transmitting UE can first execute step S902 and then execute step S903, or the transmitting UE can first execute step S903 and then execute step S902, etc., which is not limited.

[0173] S904: The receiving UE determines the SL TCI identifier of the first RS according to the first indication information from the transmitting UE.

[0174] In the Uu air interface, the TCI framework in the Uu air interface is constructed through the definition of TCI state and QCL, and the configuration and indication methods of the TCI state in the Uu air interface are given through RRC signaling, MAC CE, and DCI. The TCI framework in the Uu air interface is too flexible for the PC5 interface, its configuration and indication methods are complex, the RRC signaling and MAC CE used do not exist in the PC5 interface, and the signaling overhead is large. In the embodiments of the present application, a new SL TCI identifier is defined for the PC5 interface, and a reasonable configuration and indication method is used to complete the configuration and indication of the SL TCI identifier through the high-layer signaling and physical layer control information in the PC5 interface, reducing the signaling overhead.

[0175] Based on the above configuration and indication method of the SL TCI identifier, the embodiments of the present application provide a method for panel selection, beam selection, or antenna selection, which can solve the technical problem of the lack of methods for panel selection, beam selection, or antenna selection in SL. Taking the first terminal device as the transmitting UE and the second terminal device as the receiving UE as an example for description.

[0176] The principle of this method is: Since the channel characteristics experienced by the RSs transmitted by different panels, beams, or antennas are different. Therefore, when the SL TCI identifier is used to identify different channel characteristics, the SL TCI identifier can also identify different panels, beams, or antennas. The receiving UE can measure the reference signals transmitted by different panels, beams, or antennas, and feedback the measurement results and the corresponding SL TCI identifiers. The transmitting UE selects the panel, beam, or antenna according to the measurement results. For example, the transmitting UE can select the antenna, beam, or panel corresponding to the SL TCI identifier corresponding to the best measurement result.

[0177] In the embodiments of the present application, the transmitting UE may be configured with K candidate panels or candidate beams, where K is a positive integer. Optionally, when there is only one antenna on each panel, the K candidate panels are equivalent to K candidate antennas. In the following embodiments, the process of the embodiments of the present application is described by taking the panel selection with the panel as the candidate object as an example. It can be understood that the actual candidate object may be a beam, an antenna, etc. in addition to the panel. As Figure 10 shown, the process includes:

[0178] Optionally, S1000: The transmitting UE determines the RS for panel selection.

[0179] In a possible implementation, the transmitting UE may determine that the RS for panel selection is the SL CSI-RS. Optionally, the transmitting UE may configure an SL CSI-RS pattern; the transmitting UE may send indication information to the receiving UE, and the indication information is used to configure an SL CSI-RS pattern. Alternatively, the transmitting UE may determine that the RS for panel selection is the S-SSB.

[0180] It should be noted that the above step S1000 is an optional step, that is, the transmitting UE may not need to determine the RS for panel selection. In this case, the RS for panel selection may be defined by the standard, or configured by the resource pool, or pre-configured by the transmitting UE, etc., which is not limited.

[0181] S1001: The transmitting UE sends the RS for panel selection to the receiving UE.

[0182] In a possible implementation, the RS for panel selection may be the SL CSI-RS. The transmitting UE may send the SL CSI-RS and the first indication information to the receiving UE, and the first indication information is used to indicate the SL TCI identifier of the SL CSI-RS. For example, the transmitting UE uses the kth panel to send the first indication information and the SL CSI-RS to the receiving UE in the nth time slot among N time slots; where N slot is a positive integer, n is an integer satisfying 0≤n≤N slot -1, k is an integer satisfying 0≤k≤K-1, and the first indication information is used to indicate the SL TCI identifier n slot of the SL CSI-RS sent in the nth time slot, and n SL-TCI is an integer satisfying 0≤n SL-TCI ≤N SL-TCI ≤N SL-TCI -1, and N SL-TCI is a positive integer greater than or equal to K. The receiving UE is in N slotIn a time slot, the receiving UE receives first indication information from the transmitting UE and SL CSI-RS. And the receiving UE determines the SL TCI identifier of the above SL CSI-RS through the first indication information.

[0183] Exemplarily, as Figure 11 shown, the transmitting UE has K = 2 candidate panels, and the SL TCI identifiers n SL-TCI corresponding to the two candidate panels are 0 and 1 respectively. The transmitting UE can use N slot = 4 time slots to transmit SL CSI-RS respectively. For example, the transmitting UE can use panel 0 to transmit SL CSI-RS with an SL TCI identifier of 0 in the 0th time slot and the 1st time slot, and the transmitting UE uses panel 1 to transmit SL CSI-RS with an SL TCI identifier of 1 in the 2nd time slot and the 3rd time slot.

[0184] Another possible implementation is that the RS for panel selection can be S-SSB. The transmitting UE can send S-SSB to the receiving UE, and the first indication information of the SL TCI identifier can be carried in the S-SSB. For example, in the nth time slot among N slot time slots, the transmitting UE can use the kth panel to send S-SSB to the receiving UE, and the S-SSB includes the first indication information; where N slot is a positive integer, n is an integer satisfying 0 ≤ n ≤ N slot - 1, k is an integer satisfying 0 ≤ k ≤ K - 1, and the first indication information is used to indicate the SL TCI identifier of the S-SSB sent in the nth time slot, that is, n SL-TCI , n SL-TCI is an integer satisfying 0 ≤ n SL-TCI ≤ N SL-TCI - 1, N SL-TCI is a positive integer greater than or equal to K. The receiving UE receives the S-SSB including the first indication information from the transmitting UE in N slot time slots. The receiving UE determines the SL TCI identifier of the S-SSB through the first indication information.

[0185] It should be noted that the "time slot" in the embodiments of the present application is a time unit used to transmit downlink information, uplink information, or SL information. Optionally, a time slot may include 14 or 12 OFDM symbols. In the NR system, for different subcarrier spacings (SCS), the number of time slots included in a frame is also different. Assume a frame length of 10 ms. If the normal cyclic prefix (NCP) is used, then: when the SCS is 15 kHz, there are 10 time slots in a 10-ms frame, and a single time slot corresponds to 1 ms; when the SCS is 30 kHz, there are 20 time slots in a 10-ms frame, and a single time slot corresponds to 0.5 ms; when the SCS is 60 kHz, there are 40 time slots in a 10-ms frame, and a single time slot corresponds to 0.25 ms; when the SCS is 120 kHz, there are 80 time slots in a 10-ms frame, and a single time slot corresponds to 0.125 ms. Or, if the extended cyclic prefix (ECP) is used, only the configuration with an SCS of 60 kHz is supported, where there are 40 time slots in a 10-ms frame, and a single time slot corresponds to 0.25 ms.

[0186] S1002: The receiving UE measures the RS for panel selection and sends second indication information to the sending UE according to the measurement result. Optionally, the second indication information may be carried in one or more MAC CEs.

[0187] S1003: The sending UE performs panel selection according to the second indication information.

[0188] In a possible implementation, after the receiving UE receives the RSs sent through different panels, it can measure the RSs respectively to obtain measurement results. The receiving UE can send the above second indication information to the sending UE, where the second indication information is used to indicate different measurement results and the SL TCI identifier corresponding to each measurement result. After receiving different measurement results, the sending UE selects the measurement results that meet the conditions, and uses the panel corresponding to the SL TCI identifier of the measurement result that meets the conditions as the selected panel. Optionally, subsequently, the sending UE can use the selected panel to perform data transmission with the receiving UE. Or, the receiving UE can directly select the measurement results that meet the conditions according to the measurement results of different RSs. Then, in the second indication information sent by the receiving UE to the sending UE, only the SL TCI identifier corresponding to the measurement result that meets the conditions is carried. The receiving UE can use the panel corresponding to the SL TCI identifier carried in the second indication information as the selected panel.

[0189] Still using the aboveFigure 11 For example, the transmitting UE has two panels, namely panel 0 and panel 1. The transmitting UE uses panel 0 to send SL CSI-RS in the 0th time slot, and the SL TCI identifier corresponding to panel 0 is 0. The transmitter uses panel 1 to send SL CSI-RS in the 1st time slot, and the SL TCI identifier corresponding to panel 1 is 1. The receiving UE can measure the SL CSI-RS sent in the 0th time slot to obtain the channel measurement result 0. Similarly, the receiving UE can also measure the SL CSI-RS sent in the 1st time slot to obtain the channel measurement result 1. The receiving UE can feedback the channel measurement results of the above two SL CSI-RS to the transmitting UE respectively, as well as the SL TCI identifier corresponding to each channel measurement result. Then, in S1003, the receiving UE can perform panel selection according to the channel measurement result of the CSI-RS. For example, if the channel measurement result corresponding to the CSI-RS sent by panel 0 is better, the subsequent transmitting UE can select panel 0 to communicate with the receiving UE. Or, the above process of panel selection can occur on the receiving UE side. The receiving UE can directly select the panel according to the measurement result of the RS. Subsequently, in the second indication information of the above S1002, only the SL TCI identifier of the selected panel needs to be carried.

[0190] It should be noted that after selecting an RS, the transmitting UE needs to send it multiple times on different panels, and for each transmission, the receiving UE needs to feedback a measurement result. Therefore, in the Figure 10 process shown above, S1001 and S1002 are executed cyclically. For example, the RS determined by the transmitting UE for panel selection is SL CSI-RS. The transmitting UE has two panels. Then the transmitting UE needs to send SL CSI-RS on the two panels respectively. And for each CSI-RS, the receiving UE needs to feedback a measurement result. For example, in a possible implementation manner, the execution order of the above process can be: the transmitting UE uses panel 0 to send SL CSI-RS0 to the receiving UE, and the receiving UE feedbacks the measurement result of CSI-RS0. The transmitting UE uses panel 1 to send SL CSI-RS1 to the receiving UE, and the receiving UE feedbacks the measurement result of CSI-RS1. Or, the transmitting UE uses panel 0 and 1 to send CSI-RS0 and CSI-RS1 to the receiving UE respectively. Then, the receiving UE feedbacks the measurement results of CSI-RS0 and CSI-RS1 respectively, without limitation.

[0191] Since in the Uu air interface, the TCI framework in the Uu air interface is constructed through the definition of TCI states and QCL, and panel selection or beam selection is implemented through this TCI framework. However, the TCI framework of the Uu air interface cannot be applied to SL due to large signaling overhead and the non-existence of the required signaling on the PC5 interface. In the above embodiments, based on the proposed configuration and indication method of the SL TCI identifier, the selection of panels, beams, or antennas in SL is realized.

[0192] As Figure 12 shown, a method for indicating the SL TCI identifier is provided. In the following embodiments, the first terminal device is used as the transmitting UE and the second terminal device is used as the receiving UE as an example for description. The principle of this method is as follows: Multiple SL CSI-RS patterns are pre-configured for the transmitting UE and the receiving UE. Since the patterns of SL CSI-RS transmitted by different panels, beams, or antennas can be different. Therefore, there may be a corresponding relationship between the SL CSI-RS pattern and the SL TCI identifier. Between the two, it can be a one-to-one relationship, that is, one SL CSI-RS pattern corresponds to one SL TCI identifier. Or, between the two, it can be a many-to-one relationship, that is, multiple SL CSI-RS patterns correspond to one SL TCI identifier. Refer to Figure 12 , this method includes:

[0193] S1200: The transmitting UE configures the correspondence between N CSI-RS SL CSI-RS patterns and N SL-TCI SL TCI identifiers. Wherein, N CSI-RS is a positive integer greater than or equal to 2, and N SL-TCI is a positive integer less than or equal to N CSI-RS .

[0194] S1201: The transmitting UE sends the first indication information to the receiving UE, and the first indication information is used to indicate the correspondence between the N CSI-RS SL CSI-RS patterns and the N SL-TCI SL TCI identifiers. Correspondingly, the receiving UE receives the first indication information from the transmitting UE. Optionally, the first indication information can be carried in the PC5-RRC signaling. Optionally, the N CSI-RS SL CSI-RS patterns are configured for panel selection or beam selection.

[0195] S1202: The receiving UE determines the correspondence between the N CSI-RS SL CSI-RS patterns and N SL -TCI SL TCI identifiers according to the first indication information.

[0196] After S1202, the transmitting UE can directly send the first SL CSI-RS to the terminal device. After the receiving UE receives the first SL CSI-RS, it can determine the SL TCI identifier corresponding to the pattern of the first SL CSI-RS according to the above-configured N CSI-RS SL CSI-RS patterns and the correspondence of the N SL-TCI SLTCI identifiers.

[0197] Through the above method, a method for indicating the SL TCI identifier of multiple SL CSI-RS patterns is proposed. The transmitting UE can pre-configure the correspondence between the SL CSI-RS pattern and the SL TCI identifier to the receiving UE, and the transmitting UE no longer needs to additionally indicate the SL TCI identifier of each SL CSI-RS pattern subsequently, reducing the signaling overhead.

[0198] Based on the above method for indicating the SL TCI identifier, a method for panel selection, beam selection, or antenna selection is provided. In the following embodiments, the first terminal device is used as the transmitting UE and the second terminal device is used as the receiving UE as an example for description.

[0199] Similarly, in this example, the transmitting UE can have K candidate panels or candidate beams, where K is a positive integer. Optionally, when there is only one antenna on each panel, the above candidate panels are equivalent to candidate antennas. In the embodiments of the present application, the panel selection with the panel as the candidate object is taken as an example for illustration. It can be understood that the actual candidate object can also be a beam or an antenna, etc. As Figure 13 shown, the process includes:

[0200] S1301: The transmitting UE configures the correspondence between N CSI-RS SLCSI-RS patterns and N SL-TCI SL TCI identifiers, and the transmitting UE sends the first indication information to the receiving UE, and the first indication information is used to indicate the correspondence between the N CSI-RS SL CSI-RS patterns and N SL-TCI SL TCI identifiers.

[0201] S1302: The transmitting UE triggers panel selection.

[0202] In a possible implementation manner, the transmitting UE can send the second indication information to the receiving UE, and the second indication information is used to indicate that the transmitting UE has triggered panel selection, and the second indication information is carried in the M'-th bit of the second-level SCI, where M' is a positive integer. Optionally, M' = 1.

[0203] S1303: The transmitting UE sends the NCSI-RS The SL CSI-RS identification corresponding to one SL CSI-RS pattern.

[0204] A possible implementation. The transmitting UE uses k slot panels to simultaneously transmit the SL CSI-RS corresponding to g n SL CSI-RS patterns in the n-th time slot among N time slots; where N n is a positive integer, n is an integer satisfying 0 ≤ n ≤ N slot - 1, k slot is a positive integer less than or equal to K, and k n satisfies n g n is a positive integer less than or equal to N CSI-RS and g n satisfies The receiving UE receives the SL CSI-RS corresponding to the N slot SL CSI-RS patterns from the transmitting UE in N time slots. The receiving UE determines the SL TCI identification of each SL CSI-RS according to the N CSI-RS SL CSI-RS patterns. CSI-RS S1304: The receiving UE measures the received CSI-RS to obtain a measurement result, and sends third indication information to the transmitting UE according to the measurement result. The third indication information is used to indicate the SL TCI identification of the CSI-RS corresponding to the channel measurement result. Correspondingly, the transmitting UE receives the third indication information from the receiving UE. Optionally, the third indication information can be carried in one or more MAC CEs.

[0205]

[0206] S1305: The transmitting UE performs panel selection according to the third indication information.

[0207] Figure 10 In the embodiments of the present application, the RSs transmitted by the transmitting UE on different panels, antennas or beams are measured and fed back by the receiving UE, and the transmitting UE performs panel selection according to the fed-back measurement results, solving the technical problem that there is a lack of panel, antenna or beam selection methods in SL. Further, compared with the process shown above, the current solution can complete panel, antenna or beam selection using fewer time slots, improving the selection efficiency. And it does not use the second-level SCI to indicate the SL TCI identification, saving signaling overhead.

[0208] Figures 1 to 13 The above has described in detail the method provided by the embodiments of the present application. The following will be combined with Figure 14 and Figure 15 ​​​Describe in detail the apparatus provided by the embodiments of the present application. It should be understood that the description of the apparatus embodiments corresponds to the description of the method embodiments. Therefore, the content not described in detail can be referred to the description in the above method embodiments.

[0209] Figure 14 FIG. 1400 is a schematic block diagram of an apparatus 1400 provided by an embodiment of the present application, which is used to implement the functions for the first terminal device or the second terminal device in the above method. The apparatus may be a software unit or a chip system. The system may be composed of chips or may include chips and other discrete devices. The apparatus includes a communication unit 1401, and may further include a processing unit 1402. The communication unit 1401 can communicate with the outside. The processing unit 1402 is used for processing. The communication unit 1401 may also be referred to as a communication interface, a transceiver unit, an input / output interface, etc.

[0210] In one example, the apparatus 1400 may implement the steps executed by the first terminal device corresponding to Figure 7 the process shown in FIG. The apparatus 1400 may be a terminal device or a chip or circuit configured in the terminal device. The communication unit 1401 may execute the transceiver operations of the first terminal device in the above method embodiments, and the processing unit 1402 may execute the processing-related operations of the first terminal device in the above method embodiments.

[0211] For example, the processing unit 1402 is used to generate a first indication information and a first reference signal; the communication unit 1401 is used to send the first indication information to the second terminal device, and the first indication information is used to indicate the first sidelink transmission configuration indication (SLTCI) identifier of the first reference signal, and the first SLTCI identifier is used to indicate the channel characteristics of the first channel for transmitting the first reference signal; the communication unit 1401 is further used to send the first reference signal to the second terminal device on the first channel.

[0212] Optionally, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the second-level sidelink control information.

[0213] Optionally, the processing unit 1402 is further used to determine N SL-TCI SLTCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SLTCI identifier belongs to the N SL-TCI SLTCI identifiers; the communication unit 1401 is used to send first configuration information to the second terminal device, and the first configuration information is used to configure the N SL-TCI SLTCI identifiers for the second terminal device.

[0214] Optionally, when determining N SL-TCI SL TCI identities, the processing unit 1402 is specifically configured to: determine the N SL-TCI SL TCI identities according to the panel, transmission beam or number of antennas of the first terminal device.

[0215] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0216] Optionally, the processing unit 1402 is further configured to: determine N SL-TCI SL TCI identities according to the configuration information of the transmission resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identity belongs to the N SL-TCI SL TCI identities.

[0217] In one example, the device 1400 may implement the steps performed by the second terminal device in the corresponding Figure 7 shown process. The device 1400 may be a terminal device, or a chip or circuit configured in the terminal device, etc. The communication unit 1401 may perform the transceiver operations of the second terminal device in the above method embodiments, and the processing unit 1402 may perform the processing-related operations of the second terminal device in the above method embodiments.

[0218] For example, the communication unit 1401 is configured to receive first indication information from the first terminal device, where the first indication information is used to indicate a first sidelink transmission configuration indication (SL TCI) identity of a first reference signal, and the first SL TCI identity is used to indicate the channel characteristics of a first channel for transmitting the first reference signal; the communication unit 1401 is further configured to receive the first reference signal from the first terminal device on the first channel. The processing unit 1402 is configured to process the first indication information and the first reference signal.

[0219] Optionally, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

[0220] Optionally, the communication unit 1401 is further configured to receive first configuration information from the first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identities for the second terminal device, and the first SL TCI identity belongs to the N SL-TCIan SLTCI identifier; a processing unit 1402, configured to determine the N SL-TCI SLTCI identifiers.

[0221] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0222] Optionally, the processing unit 1402 is further configured to determine N SL-TCI SLTCI identifiers according to the configuration information of the receiving resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SLTCI identifier belongs to the N SL-TCI SLTCI identifiers.

[0223] In one example, the apparatus 1400 may implement the steps performed by the first terminal device corresponding to Figure 8 the process shown. The apparatus 1400 may be a terminal device, or a chip or circuit configured in the terminal device, etc. The communication unit 1401 may perform the transceiver operations of the first terminal device in the foregoing method embodiments, and the processing unit 1402 may perform the processing-related operations of the first terminal device in the foregoing method embodiments.

[0224] For example, the processing unit 1402 is configured to determine a first sidelink transmission configuration indication (SLTCI) identifier of a first signal, where the first SLTCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first signal; the processing unit 1402 is further configured to determine the first signal according to the first SLTCI identifier; and the communication unit 1401 is configured to send the first signal to a second terminal device on the first channel.

[0225] Optionally, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal, and an initialization parameter of a sequence of the physical sidelink broadcast channel demodulation reference signal is determined according to the first SLTCI identifier.

[0226] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0227]

[0228] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the represents an integer value obtained according to the sidelink synchronization signal block index, the represents the sidelink synchronization signal identifier, and nSL-TCI represents the first SLTCI identifier, where n SL-TCI is a natural number;

[0229] obtaining the above according to the sidelink synchronization signal block index satisfies: where i S-SSB represents the sidelink synchronization signal block index, U is an integer greater than or equal to 0, and mod represents the modulo operation.

[0230] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0231]

[0232] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, M is a positive integer, and represents the sidelink synchronization signal identifier, where n SL-TCI represents the first SL TCI identifier, where n SL-TCI is a natural number.

[0233] Optionally, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel, and the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel is determined according to the first SL TCI identifier.

[0234] Optionally, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0235]

[0236] where c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, M is a positive integer, and represents the sidelink synchronization signal identifier, where n SL-TCI represents the first SL TCI identifier, where n SL-TCI is a natural number.

[0237] Optionally, the processing unit 1402 is further configured to determine N SL-TCI SL TCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers; the communication unit 1401 is further configured to send first configuration information to the second terminal device, and the first configuration information is used to configure the N SL-TCI SLTCI identifiers for the second terminal device.

[0238] Optionally, when determining the N SL-TCI SL TCI identities, the processing unit 1402 is specifically configured to: determine the N SL-TCI SL TCI identities according to the panel, transmission beam or number of antennas of the first terminal device.

[0239] Optionally, the first configuration information is carried in a radio resource control message on the PC5 interface, or the first configuration information is carried in a media access control control element on the PC5 interface.

[0240] Optionally, the processing unit 1402 is further configured to: determine N SL-TCI SL TCI identities according to the configuration information of the transmission resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identity belongs to the N SL-TCI SL TCI identities.

[0241] In one example, the device 1400 may implement the steps performed by the second terminal device in the corresponding Figure 8 shown process. The device 1400 may be a terminal device, or a chip or circuit configured in the terminal device, etc. The communication unit 1401 may perform the transceiver operations of the second terminal device in the above method embodiments, and the processing unit 1402 may perform the processing-related operations of the second terminal device in the above method embodiments.

[0242] For example, the communication unit 1401 is configured to receive a first signal from a first terminal device on a first channel; the processing unit 1402 is configured to determine a first sidelink transmission configuration indication (SL TCI) identity according to the first signal, where the first SL TCI identity is used to indicate the channel characteristics of the first channel for transmitting the first signal.

[0243] Optionally, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal. When determining the first SL TCI identity according to the first signal, the processing unit 1402 is specifically configured to: determine the first SL TCI identity according to the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal.

[0244] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0245]

[0246] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, and the represents an integer value obtained according to the sidelink synchronization signal block index, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, the n SL-TCI is a natural number;

[0247] The obtaining of the sidelink synchronization signal block index to obtain the satisfies: The i S-SSB represents the sidelink synchronization signal block index, the U is an integer greater than or equal to 0, and the mod represents the modulo operation.

[0248] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0249]

[0250] wherein, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the M is a positive integer, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, the n SL-TCI is a natural number.

[0251] Optionally, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel, and when the processing unit 1402 determines the first SL TCI identifier according to the first signal, it is specifically configured to: determine the first SL TCI identifier according to the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel.

[0252] Optionally, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0253]

[0254] wherein, the c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, the M is a positive integer, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, the n SL-TCI is a natural number.

[0255] Optionally, the communication unit 1401 is further configured to: receive first configuration information from a first terminal device, and the first configuration information is used to configure N for a second terminal device SL-TCIa first SL TCI identifier, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0256] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0257] Optionally, the processing unit 1402 is further configured to: determine N SL-TCI SL TCI identifiers according to the configuration of the receiving resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0258] In the embodiments of the present application, the division of units is illustrative, merely a logical function division. In actual implementation, there may be other division methods. In addition, in each embodiment of the present application, each functional unit may be integrated in a processor, may also exist physically alone, or two or more units may be integrated in one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0259] It can be understood that the functions of the communication unit in the above embodiments may be implemented by a transceiver, and the functions of the processing unit may be implemented by a processor. The transceiver may include a transmitter and / or a receiver, etc., which are respectively used to implement the functions of the sending unit and / or the receiving unit. The following combination Figure 15 is illustrated by examples.

[0260] Figure 15 The communication device 1500 shown in the figure includes at least one processor 1501. The communication device 1500 may further include at least one memory 1502 for storing program instructions and / or data. The memory 1502 and the processor 1501 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 1501 and the memory 1502 may cooperate, and the processor 1501 may execute the program instructions stored in the memory 1502, and at least one of the at least one memory 1502 may be included in the processor 1501.

[0261] The apparatus 1500 may further include a communication interface 1503 for communicating with other devices via a transmission medium, so that the communication apparatus 1500 can communicate with other devices. In the embodiments of the present application, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces. In the embodiments of the present application, when the communication interface is a transceiver, the transceiver may include an independent receiver, an independent transmitter; or a transceiver integrating transceiver functions, or an interface circuit.

[0262] It should be understood that the connection medium between the above-mentioned processor 1501, memory 1502, and communication interface 1503 is not limited in the embodiments of the present application. In the embodiments of the present application Figure 15 it is shown that the memory 1502, the processor 1501, and the communication interface 1503 are connected through a communication bus 1504, and the bus is Figure 15 shown by a thick line in, and the connection manners between other components are only illustrative and not intended to be limiting. The bus may include an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 15 only a thick line is shown in, but it does not mean that there is only one bus or one type of bus, etc.

[0263] In one example, the apparatus 1500 is used to implement the steps performed by the first terminal device in the above Figure 7 shown process. The communication interface 1503 is used to perform the transceiver-related operations of the first terminal device in the above embodiments, and the processor 1501 is used to perform the processing-related operations of the first terminal device in the above method embodiments.

[0264] For example, the processor 1501 is used to generate first indication information and a first reference signal; the communication interface 1503 is used to send the first indication information to a second terminal device, and the first indication information is used to indicate a first sidelink transmission configuration indication (SLTCI) identifier of the first reference signal, and the first SLTCI identifier is used to indicate the channel characteristics of the first channel for transmitting the first reference signal; the communication interface 1503 is further used to send the first reference signal to the second terminal device on the first channel.

[0265] Optionally, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

[0266] Optionally, the processor 1501 is further used to determine N SL-TCI SLTCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SLTCI identifier belongs to the N SL-TCIan SL TCI identifier; a communication interface 1503, configured to send first configuration information to the second terminal device, where the first configuration information is used to configure the N SL-TCI SL TCI identifiers for the second terminal device.

[0267] Optionally, when determining the N SL-TCI SL TCI identifiers, the processor 1501 is specifically configured to: determine the N SL-TCI SL TCI identifiers according to the panel, transmission beam or number of antennas of the first terminal device.

[0268] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0269] Optionally, the processor 1501 is further configured to: determine N SL-TCI SL TCI identifiers according to the configuration information of the transmission resource pool, where the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0270] For example, the communication interface 1503 is configured to receive first indication information from the first terminal device, where the first indication information is used to indicate a first sidelink transmission configuration indication (SL TCI) identifier of a first reference signal, and the first SL TCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first reference signal; the communication interface 1503 is further configured to receive the first reference signal from the first terminal device on the first channel. The processor 1501 is configured to process the first indication information and the first reference signal.

[0271] Optionally, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in sidelink control information of a second level.

[0272] Optionally, the communication interface 1503 is further configured to receive first configuration information from the first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identifiers for the second terminal device, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers; the processor 1501 is configured to determine the N SL-TCI SL TCI identifiers according to the first configuration information.

[0273] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0274] Optionally, the processor 1501 is further configured to determine N SL-TCI SL TCI identifiers according to the configuration information of the received resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0275] In one example, the apparatus 1500 is configured to implement the steps performed by the second terminal device in the above Figure 7 shown process. The communication interface 1503 is configured to perform the transceiver-related operations of the second terminal device in the foregoing embodiments, and the processor 1501 is configured to perform the processing-related operations of the second terminal device in the foregoing method embodiments.

[0276] For example, the communication interface 1503 is configured to receive first indication information from the first terminal device, where the first indication information is used to indicate a first sidelink transmission configuration indication (SL TCI) identifier of a first reference signal, and the first SL TCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first reference signal; the communication interface 1503 is further configured to receive the first reference signal from the first terminal device on the first channel. The processor 1501 is configured to process the first indication information and the first reference signal.

[0277] Optionally, the first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the second-level sidelink control information.

[0278] Optionally, the communication interface 1503 is further configured to receive first configuration information from the first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identifiers for the second terminal device, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers; the processor 1501 is configured to determine the N SL-TCI SL TCI identifiers according to the first configuration information.

[0279] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0280] Optionally, the processor 1501 is further configured to determine N SL-TCI SL TCI identifiers according to the configuration information of the received resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0281] In one example, the apparatus 1500 is configured to implement the steps performed by the first terminal device in the above Figure 8 shown process. The communication interface 1503 is configured to perform the transceiver-related operations of the first terminal device in the foregoing embodiments, and the processor 1501 is configured to perform the processing-related operations of the first terminal device in the foregoing method embodiments.

[0282] For example, the processor 1501 is configured to determine a first sidelink transmission configuration indication (SL TCI) identifier of a first signal, where the first SL TCI identifier is used to indicate the channel characteristics of a first channel for transmitting the first signal; the processor 1501 is further configured to determine the first signal according to the first SL TCI identifier; and the communication interface 1503 is configured to send the first signal to a second terminal device on the first channel.

[0283] Optionally, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal, and an initialization parameter of a sequence of the physical sidelink broadcast channel demodulation reference signal is determined according to the first SL TCI identifier.

[0284] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0285]

[0286] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, represents an integer value obtained according to the sidelink synchronization signal block index, represents the sidelink synchronization signal identifier, n SL-TCI represents the first SL TCI identifier, and n SL-TCI is a natural number;

[0287] The obtaining of the according to the sidelink synchronization signal block index satisfies: where i S-SSB represents the sidelink synchronization signal block index, U is an integer greater than or equal to 0, and mod represents the modulo operation.

[0288] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0289]

[0290] wherein, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, M is a positive integer, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0291] Optionally, the first signal is a sidelink synchronization signal block, the sidelink synchronization signal block includes a physical sidelink broadcast channel, and the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel is determined according to the first SL TCI identifier.

[0292] Optionally, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0293]

[0294] wherein, the c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, M is a positive integer, the represents the sidelink synchronization signal identifier, the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0295] Optionally, the processor 1501 is further configured to determine N SL-TCI SL TCI identifiers, N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers; the communication interface 1503 is further configured to send first configuration information to the second terminal device, and the first configuration information is used to configure the N SL-TCI SLTCI identifiers for the second terminal device.

[0296] Optionally, when the processor 1501 determines the N SL-TCI SL TCI identifiers, it is specifically configured to: determine the N SL-TCI SL TCI identifiers according to the panel, transmission beam or number of antennas of the first terminal device.

[0297] Optionally, the first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

[0298] Optionally, the processor 1501 is further configured to: determine N SL-TCI SL TCI identifiers according to the configuration information of the transmission resource pool, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0299] In one example, the device 1500 is used to implement the steps performed by the second terminal device in the above Figure 8 shown process. The communication interface 1503 is used to perform the transceiver-related operations of the second terminal device in the foregoing embodiments, and the processor 1501 is used to perform the processing-related operations of the second terminal device in the foregoing method embodiments.

[0300] For example, the communication interface 1503 is used to receive a first signal from a first terminal device on a first channel; the processor 1501 is used to determine a first sidelink transmission configuration indication (SL TCI) identifier according to the first signal, and the first SL TCI identifier is used to indicate the channel characteristics of the first channel for transmitting the first signal.

[0301] Optionally, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel demodulation reference signal. When determining the first SL TCI identifier according to the first signal, the processor 1501 is specifically configured to: determine the first SL TCI identifier according to the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal.

[0302] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0303]

[0304] where c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, the represents an integer value obtained according to the sidelink synchronization signal block index, the represents the sidelink synchronization signal identifier, n SL-TCI represents the first SL TCI identifier, and n SL-TCI is a natural number;

[0305] The obtaining the according to the sidelink synchronization signal block index satisfies: The i S-SSB represents the sidelink synchronization signal block index, U is an integer greater than or equal to 0, and mod represents the modulo operation.

[0306] Optionally, the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal satisfies:

[0307]

[0308] wherein, the c init represents the initialization parameter of the sequence of the physical sidelink broadcast channel demodulation reference signal, M is a positive integer, and the represents the sidelink synchronization signal identifier, and the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0309] Optionally, the first signal is a sidelink synchronization signal block, and the sidelink synchronization signal block includes a physical sidelink broadcast channel. When the processor 1501 determines the first SL TCI identifier according to the first signal, it is specifically configured to: determine the first SL TCI identifier according to the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel.

[0310] Optionally, the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel satisfies:

[0311]

[0312] wherein, the c init represents the initialization parameter of the scrambling sequence of the physical sidelink broadcast channel, M is a positive integer, and the represents the sidelink synchronization signal identifier, and the n SL-TCI represents the first SL TCI identifier, and the n SL-TCI is a natural number.

[0313] Optionally, the communication interface 1503 is further configured to: receive first configuration information from a first terminal device, where the first configuration information is used to configure N SL-TCI SL TCI identifiers for a second terminal device, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0314] Optionally, the first configuration information is carried in a radio resource control message on the PC5 interface, or the first configuration information is carried in a media access control control element on the PC5 interface.

[0315] Optionally, the processor 1501 is further configured to: determine N according to the configuration of the receive resource poolSL-TCI an SL TCI identifier, and the N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

[0316] Furthermore, an embodiment of the present application also provides a device for performing the method in the above method embodiment. A computer-readable storage medium includes a program, and when the program is executed by a processor, the method in the above method embodiment is executed. A computer program product includes computer program code, and when the computer program code is run, it causes a computer to execute the method in the above method embodiment. A chip includes: a processor, the processor is coupled to a memory, and the memory is used to store a program or instructions, and when the program or instructions are executed by the processor, it causes the device to execute the method in the above method embodiment.

[0317] In an embodiment of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0318] In an embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or may also be a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and / or data.

[0319] In the method provided by the embodiments of the present application, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a digital video disc (DVD)), or a semiconductor medium (such as an SSD), etc.

[0320] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A communication method, characterized in that, Comprising: Determine N SL-TCI SLTCI identifiers, where the N SL-TCI is a positive integer greater than or equal to 1; Send first configuration information to a second terminal device, where the first configuration information is used to configure the N SL-TCI SL TCI identifiers for the second terminal device; Send first indication information, where the first indication information is used to indicate the channel characteristics of a first channel for transmitting a first reference signal, and the channel characteristics of the first channel for transmitting the first reference signal belong to the channel characteristics indicated by the N SL-TCI SL TCI identities; Transmitting the first reference signal to the second terminal device on the first channel.

2. The method according to claim 1, characterized in that, The first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

3. The method according to claim 1, characterized in that, The determination of N SL-TCI SL TCI identifications, including: Determine the N SL-TCI SL TCI identifiers according to the number of panels, transmit beams, or antennas of the first terminal device.

4. The method according to claim 1 or 3, characterized in that, The first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

5. The method according to claim 1 or 2, characterized in that, The method further comprises: Determine N according to the configuration information of the transmission resource pool SL-TCI SL TCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

6. A communication method, characterized in that, Comprising: Receive first configuration information from a first terminal device, where the first configuration information is used to configure N SL-TCI SLTCI identifiers for a second terminal device; Determine the N SL-TCI SL TCI identifiers according to the first configuration information; Receive first indication information, where the first indication information is used to indicate the channel characteristics of a first channel for transmitting a first reference signal, and the channel characteristics of the first channel for transmitting the first reference signal belong to the channel characteristics indicated by the N SL-TCI SL TCI identities; Receiving a first reference signal from the first terminal device on the first channel.

7. The method according to claim 6, characterized in that, The first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

8. The method according to claim 6, characterized in that, The first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

9. The method according to claim 6 or 8, characterized in that, The method further comprises: Determine N according to the configuration information of the receiving resource pool SL-TCI SL TCI identifiers, where N SL-TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

10. A terminal device, characterized in that, Comprising: Processing unit, upon determining N SL-TCI SL TCI identifiers, where the N SL-TCI is a positive integer greater than or equal to 1; A communication unit that sends first configuration information to a second terminal device, where the first configuration information is used to configure the N SL-TCI SL TCI identifiers for the second terminal device; The processing unit is further configured to generate first indication information and a first reference signal; Among them, the first indication information is used to transmit the channel characteristics of the first channel for the first reference signal, and the channel characteristics of the first channel for transmitting the first reference signal belong to the channel characteristics indicated by the N SL-TCI SL TCI identifications; The communication unit is further configured to send the first indication information and transmit the first reference signal to the second terminal device on the first channel.

11. The device according to claim 10, characterized in that, The first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

12. The device according to claim 10, characterized in that, The processing unit, when determining N SL-TCI SL TCI identifiers, is specifically configured to: Determine the N SL-TCI SL TCI identifiers according to the number of panels, transmission beams, or antennas of the first terminal device.

13. The device according to claim 10 or 12, characterized in that, The first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

14. The device according to claim 10 or 11, characterized in that, The processing unit is further configured to determine N SL-TCI SL TCI identifiers according to the configuration information of the sending resource pool, where N SL -TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

15. A terminal device, characterized in that, Comprising: A communication unit, configured to receive first configuration information from a first terminal device, where the first configuration information is used to configure N SL-TCI SLTCI identifiers for a second terminal device; A processing unit, configured to determine the N SL-TCI SL TCI identifiers according to the first configuration information; The communication unit is further configured to receive first indication information for indicating a channel characteristic of a first channel for transmitting a first reference signal, where the channel characteristic of the first channel for transmitting the first reference signal belongs to the channel characteristics indicated by the N SL -TCI SL TCI identifications; The communication unit is further configured to receive a first reference signal from the first terminal device on the first channel; The processing unit is further configured to process the first indication information and the first reference signal.

16. The device according to claim 15, characterized in that, The first reference signal includes a physical sidelink shared channel demodulation reference signal, or a physical sidelink control channel demodulation reference signal, or a sidelink channel state information reference signal, and the first indication information is carried in the sidelink control information of the second level.

17. The device according to claim 15, characterized in that, The first configuration information is carried in a radio resource control message of the PC5 interface, or the first configuration information is carried in a media access control control element of the PC5 interface.

18. The device according to claim 15 or 17, characterized in that, The processing unit is further configured to determine N SL-TCI SL TCI identifiers according to the configuration information of the receiving resource pool, where N SL -TCI is a positive integer greater than or equal to 1, and the first SL TCI identifier belongs to the N SL-TCI SL TCI identifiers.

19. A terminal device, characterized in that, Comprising a processor, the processor is coupled to at least one memory, and the processor is configured to read a computer program stored in the at least one memory to execute the method according to any one of claims 1 to 5, or execute the method according to any one of claims 6 to 9.

20. A chip, characterized in that, Comprising a processor and a communication interface, the processor is configured to read instructions to execute the method according to any one of claims 1 to 5, or execute the method according to any one of claims 6 to 9.

21. A computer-readable storage medium, characterized in that, Comprising a program, when the program is run by a processor, the method according to any one of claims 1 to 5 is executed, or the method according to any one of claims 6 to 9 is executed.

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