Communication method and terminal

Abstract

A communication method and a terminal are provided. The method comprises: a first terminal generating indication information; and the first terminal sending the indication information to a second terminal. The first terminal sends the indication information to the second terminal, so that the second terminal determines a receiving beam matched with a sending beam selected by the first terminal based on the indication information, thereby avoiding the second terminal being unable to select a receiving beam corresponding to the sending beam due to the second terminal being unable to learn the sending beam selected by the first terminal in a conventional sidelink communication scenario, and improving the quality of the sidelink communication.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a communication method and terminal. Background Technology

[0002] To improve the communication quality of the sidelink, a multi-beam system is considered for sidelink transmission. The transmitting terminal (also known as the first terminal) and the receiving terminal (also known as the second terminal) can select the transmit and receive beams for subsequent sidelink transmission through beam selection and beam measurement processes. However, when the first terminal selects the transmit beam based on the beam measurement results fed back by the second terminal, the second terminal, unable to know the first terminal's selection result, will be unable to select a suitable receive beam to receive the sidelink data, leading to a decrease in the communication quality of the sidelink. Summary of the Invention

[0003] This application provides a communication method and terminal to improve the communication quality of the side link.

[0004] In a first aspect, a communication method is provided, comprising: a first terminal generating indication information; the first terminal sending the indication information to a second terminal, wherein the indication information is used to indicate a first transmission configuration indicating a TCI state, or, the indication information is used to indicate that the second terminal uses a first spatial domain receiving filter to receive sideline data, the first spatial domain receiving filter being a target spatial domain receiving filter used by the second terminal to receive a first sideline reference signal, or the indication information is used to indicate that the first terminal uses a first spatial domain transmitting filter to transmit sideline data, the first spatial domain transmitting filter being a target spatial domain transmitting filter used by the first terminal to transmit the first sideline reference signal, or the indication information is used to indicate that the second terminal uses first spatial domain receiving parameters to receive sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate that the first terminal uses first spatial domain transmitting parameters to transmit sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to transmit the first sideline reference signal.

[0005] In a second aspect, a communication method is provided, comprising: a second terminal receiving indication information sent by a first terminal; the second terminal receiving sideline data sent by the first terminal based on the indication information, wherein the indication information is used to indicate a first transmission configuration indicating a TCI state, or, the indication information is used to indicate that the second terminal uses a first spatial domain receiving filter to receive the sideline data, the first spatial domain receiving filter being a target spatial domain receiving filter used by the second terminal to receive a first sideline reference signal, or the indication information is used to indicate that the first terminal uses a first spatial domain transmitting filter to transmit the sideline data, the first spatial domain transmitting filter being a target spatial domain transmitting filter used by the first terminal to transmit the first sideline reference signal, or the indication information is used to indicate that the second terminal uses first spatial domain receiving parameters to receive the sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate that the first terminal uses first spatial domain transmitting parameters to transmit the sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to transmit the first sideline reference signal.

[0006] Thirdly, a first terminal is provided, comprising: a generation unit for generating indication information; and a transmission unit for transmitting the indication information to a second terminal, wherein the indication information is used to indicate a first transmission configuration indicating a TCI state, or the indication information is used to indicate that the second terminal uses a first spatial domain receiving filter to receive sideline data, the first spatial domain receiving filter being a target spatial domain receiving filter used by the second terminal to receive a first sideline reference signal, or the indication information is used to indicate that the first terminal uses a first spatial domain transmitting filter to transmit sideline data, the first spatial domain transmitting filter being a target spatial domain transmitting filter used by the first terminal to transmit the first sideline reference signal, or the indication information is used to indicate that the second terminal uses first spatial domain receiving parameters to receive sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate that the first terminal uses first spatial domain transmitting parameters to transmit sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to transmit the first sideline reference signal.

[0007] Fourthly, a second terminal is provided, comprising: a receiving unit for receiving indication information sent by a first terminal; and a sending unit for receiving sideline data sent by the first terminal based on the indication information, wherein the indication information is used to indicate a first transmission configuration indicating a TCI state, or the indication information is used to indicate that the second terminal uses a first spatial domain receiving filter to receive the sideline data, the first spatial domain receiving filter being a target spatial domain receiving filter used by the second terminal to receive a first sideline reference signal, or the indication information is used to indicate that the first terminal uses a first spatial domain transmitting filter to send the sideline data, the first spatial domain transmitting filter being a target spatial domain transmitting filter used by the first terminal to send the first sideline reference signal, or the indication information is used to indicate that the second terminal uses first spatial domain receiving parameters to receive the sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate that the first terminal uses first spatial domain transmitting parameters to send the sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to send the first sideline reference signal.

[0008] Fifthly, a terminal is provided, including a memory and a processor, the memory for storing a program, and the processor for calling the program in the memory to perform the method as described in the first or second aspect.

[0009] A sixth aspect provides an apparatus including a processor for calling a program from memory to perform the method described in the first or second aspect.

[0010] A seventh aspect provides a chip including a processor for calling a program from memory, causing a device having the chip mounted to perform the method described in the first or second aspect.

[0011] Eighthly, a computer-readable storage medium is provided having a program stored thereon that causes a computer to perform the method described in the first or second aspect.

[0012] Ninth aspect, a computer program product is provided, including a program that causes a computer to perform the method described in the first or second aspect.

[0013] In a tenth aspect, a computer program is provided that causes a computer to perform the method described in the first or second aspect.

[0014] The first terminal sends an instruction to the second terminal, enabling the second terminal to determine a receiving beam that matches the transmitting beam selected by the first terminal. This avoids the situation in traditional sidelink communication scenarios where the second terminal cannot know the transmitting beam selected by the first terminal and therefore cannot select a receiving beam corresponding to the transmitting beam, thus improving the communication quality of the sidelink. Attached Figure Description

[0015] Figure 1 This is the wireless communication system 100 used in the embodiments of this application.

[0016] Figure 2 The frame structure of a system frame in NR-V2X that does not carry a PSFCH is shown.

[0017] Figure 3 The frame structure of a system frame carrying a PSFCH in NR-V2X is shown.

[0018] Figure 4 A schematic diagram of the time-frequency resources occupied by SL CSI-RS is shown.

[0019] Figure 5 This illustrates the beam communication process in a scenario where network devices communicate with terminals.

[0020] Figure 6 This illustrates the beam communication process in a scenario where network devices communicate with terminals.

[0021] Figure 7 The beam communication process is illustrated in a side link communication scenario.

[0022] Figure 8 This is a flowchart of a communication method according to an embodiment of this application.

[0023] Figure 9 A schematic diagram showing the format of configuration information 1 according to an embodiment of this application is illustrated.

[0024] Figure 10 A schematic diagram showing the format of configuration information 1 according to another embodiment of this application is illustrated.

[0025] Figure 11 A schematic diagram showing the format of configuration information 1 according to another embodiment of this application is illustrated.

[0026] Figure 12 A schematic diagram showing the format of configuration information 1 according to another embodiment of this application is illustrated.

[0027] Figure 13 The temporal location of the transmission indication information in an embodiment of this application is shown.

[0028] Figure 14This is a schematic diagram of the format of configuration information 2 in an embodiment of this application.

[0029] Figure 15 This is a schematic diagram of the format of configuration information 2 according to another embodiment of this application.

[0030] Figure 16 This is a schematic diagram of the first terminal according to an embodiment of this application.

[0031] Figure 17 This is a schematic diagram of the second terminal according to an embodiment of this application.

[0032] Figure 18 This is a schematic structural diagram of a communication device according to an embodiment of this application. Detailed Implementation

[0033] The technical solution of this application will now be described with reference to the accompanying drawings. For ease of understanding, the following description will first refer to the accompanying drawings. Figures 1 to 7 This application introduces the terminology and communication process involved.

[0034] Figure 1 This is the wireless communication system 100 to which the embodiments of this application apply. The wireless communication system 100 may include a network device 110 and terminals 121-129. The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminals located within that coverage area.

[0035] In some implementations, terminals can communicate with each other via a sidelink (SL). Sidelink communication is also known as proximity services (ProSe) communication, one-way communication, sidelink communication, or device-to-device (D2D) communication.

[0036] Alternatively, terminals transmit sidelink data to each other via sidelinks. This sidelink data can include data and / or control signaling. In some implementations, the sidelink data can be, for example, a physical sidelink control channel (PSCCH), a physical sidelink control channel (PSSCH), a PSCCH demodulation reference signal (DMRS), a PSSCHDMRS, a physical sidelink feedback channel (PSFCH), etc.

[0037] The following text combines Figure 1This section introduces several common sidelink communication scenarios. Sidelink communication can be categorized into four scenarios based on whether the terminals in the sidelink are within the network device's coverage area. Scenario 1: Terminals conduct sidelink communication within the network device's coverage area. Scenario 2: Some terminals conduct sidelink communication within the network device's coverage area. Scenario 3: Terminals conduct sidelink communication outside the network device's coverage area.

[0038] like Figure 1 As shown, in scenario 1, terminals 121 and 122 can communicate via a side link, and all terminals 121 and 122 are within the coverage area of ​​network device 110, or in other words, all terminals 121 and 122 are within the coverage area of ​​the same network device 110. In this scenario, network device 110 can send configuration signaling to terminals 121 and 122, and correspondingly, terminals 121 and 122 communicate via the side link based on the configuration signaling.

[0039] like Figure 1 As shown, in scenario 2, terminals 123 and 124 can communicate via the sidelink, with terminal 123 within the coverage area of ​​network device 110 and terminal 124 outside the coverage area of ​​network device 110. In this scenario, terminal 123 receives configuration information from network device 110 and communicates via the sidelink based on the configuration signaling. However, for terminal 124, since it is outside the coverage area of ​​network device 110, it cannot receive the configuration information from network device 110. In this case, terminal 124 can obtain the sidelink communication configuration based on the pre-configuration configuration information and / or the configuration information sent by terminal 123 within the coverage area, so as to communicate with terminal 123 via the sidelink based on the obtained configuration.

[0040] In some cases, terminal 123 can send the above configuration information to terminal 124 via the physical sidelink broadcast channel (PSBCH) to configure terminal 124 to communicate via the sidelink.

[0041] like Figure 1 As shown, in scenario 3, terminals 125-129 are all outside the coverage area of ​​network device 110 and cannot communicate with network device 110. In this case, all terminals can configure sidelink communication based on pre-configuration information.

[0042] In some cases, terminals 127-129 located outside the coverage area of ​​network equipment can form a communication group, and terminals 127-129 within the communication group can communicate with each other. In addition, terminal 127 within the communication group can act as a central control node, also known as the cluster header (CH), and correspondingly, other terminals within the communication group can be called "group members".

[0043] Terminal 127, acting as a CH, may have one or more of the following functions: establishing communication groups; allowing members to join or leave the group; coordinating resources, allocating side-transmission resources to group members, and receiving side-transmission feedback information from group members; and coordinating resources with other communication groups.

[0044] It should be noted that, Figure 1 An exemplary embodiment shows a network device and multiple terminal devices. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

[0045] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0046] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, and satellite communication systems, etc.

[0047] The terminal in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication equipment, user agent, or user device. The terminal equipment in this application embodiment can be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as handheld devices with wireless connectivity, vehicle-mounted devices, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the UE can act as a base station. For example, the UE can act as a scheduling entity, providing sideline data between UEs in V2X or D2D, etc. For example, cellular phones and cars communicate with each other using sideline data. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0048] The network device in this application embodiment can be a device used to communicate with a terminal device. This network device can also be called an access network device or a wireless access network device, such as a base station. In this application embodiment, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master MeNB, auxiliary SeNB, multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. Base stations can also be mobile switching centers, devices that perform base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or device forms used in the network equipment.

[0049] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0050] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0051] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located.

[0052] It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0053] Sidelink resource allocation method

[0054] Currently, in some communication systems (e.g., NR), two resource configuration methods for sidelink resources are defined: Mode 1 and Mode 2.

[0055] Mode 1: Network devices schedule side-link resources for terminal devices.

[0056] Currently, Mode 1 can be divided into two methods: dynamic resource allocation and sidelink configured grant (SLCG). Under dynamic resource allocation, network devices can allocate sidelink transmission resources to terminals by sending downlink control information (DCI). Under the sidelink configured grant method, once a terminal is allocated sidelink resources, it can use those resources to transmit data without needing to request new sidelink resources from the network device. Therefore, using the configured grant resource allocation method can reduce sidelink transmission latency.

[0057] The aforementioned configuration authorization is further subdivided into two types. In Type 1, sidelink resource configuration is entirely based on radio resource control (RRC) signaling. In Type 2, sidelink resource configuration in the communication system can be configured jointly by RRC signaling and Layer 1 (L1) signaling, where L1 signaling is used to indicate the activation and deactivation of RRC configuration.

[0058] In some implementations, the network device can schedule sidelink resources for a single transmission for the terminal. In other implementations, the network device can also configure semi-static sidelink resources for the terminal.

[0059] For example, see Figure 1 Terminal devices 121 to 123 are located within the coverage area of ​​network device 110, and network device 110 can allocate sidelink resources to terminal devices 121 to 123.

[0060] In Mode 2, the terminal autonomously selects sidelink resources from the resource pool.

[0061] In this mode, the terminal performs a resource probing process and / or a resource selection process. During resource probing, the terminal can assess the occupancy of sidelink resources by demodulating sidelink control information (SCI). The terminal can also assess the occupancy of sidelink resources by measuring the received power of the sidelink.

[0062] For example, see Figure 1 Terminal devices 124-129 are located outside the coverage area of ​​network device 110. Terminal devices 124-129 can autonomously select sidelink resources through the above-mentioned mode 2.

[0063] Side link transmission method

[0064] With the development of autonomous driving technology, it is possible to integrate autonomous driving technology with communication systems, or in other words, to achieve data interaction between in-vehicle devices through communication systems. Therefore, higher demands are placed on communication systems. For example, they need to support higher throughput, lower latency, higher reliability, wider coverage, and more flexible resource allocation. In LTE-V2X, sidelink communication between terminals only supports broadcast. With technological advancements, NR-V2X has introduced unicast and multicast transmission methods.

[0065] In unicast transmission, there is typically only one terminal receiving the data. (See also...) Figure 1 Terminal 121 and terminal 122 can communicate via unicast transmission. When terminal 121 sends side data through the side link, terminal 122 receives the side data as the sole receiving device.

[0066] For multicast transmission, the terminals receiving horizontal data can be all terminals within a communication group, or all terminals within a certain transmission distance. For example, see... Figure 1For a communication group including terminals 127-129, when terminal 127 sends sideline data via multicast, the other terminals 128-129 in the communication group are all receiving terminals that receive the sideline data. For example, see... Figure 1 Assuming that the terminals within the preset range include terminals 127 to 129, when terminal 127 sends side data in a multicast manner, the other terminals 128 to 129 within the preset range are all receiving terminals that receive the side data.

[0067] In broadcast transmission, the receiving terminal can be any terminal surrounding the sending terminal. For example, see... Figure 1 Assuming terminal 125 acts as the transmitter and broadcasts side data, then terminals 121-124 and 126-129 located around terminal 125 can all act as receivers of this side data.

[0068] System Frame Structure

[0069] The following text combines Figures 2 to 3 This paper describes the frame structure of the side-link system frames applicable to the embodiments of this application. Figure 2 The frame structure of a system frame in NR-V2X that does not carry a PSFCH is shown. Figure 3 The frame structure of a system frame carrying a PSFCH in NR-V2X is shown.

[0070] See Figure 2 In the time domain, the sideline symbols occupied by the PSCCH begin from the second sideline symbol of the system frame (e.g., an orthogonal frequency division multiplexing (OFDM) symbol), occupying 2 or 3 sideline symbols. In the frequency domain, the PSCCH can occupy {10, 12, 15, 20, 25} physical resource blocks (PRBs). Typically, to reduce the complexity of blind detection of the PSCCH by terminal equipment, only one type of PSCCH symbol count and PRB count is allowed within a resource pool. Furthermore, since the sub-channel is the smallest granularity for PSSCH resource allocation specified in NR-V2X, the number of PRBs occupied by the PSCCH must be less than or equal to the number of PRBs contained in a sub-channel within the resource pool, to avoid imposing additional restrictions on PSSCH resource selection or allocation.

[0071] See also Figure 2In the time domain, the PSSCH also starts from the second sideline symbol of the system frame and ends at the second-to-last sideline symbol of the system frame. In the frequency domain, the PSSCH occupies K sub-channels of the system frame, and each sub-channel includes N consecutive PRBs, where K and N are positive integers.

[0072] Typically, the last symbol of a system frame is the guard period (GP) symbol. Additionally, the first sideline symbol of a system frame is a repetition of the second sideline symbol. When a terminal receives this system frame, it can usually use the first sideline symbol as an automatic gain control (AGC) symbol. The data on the AGC symbol is generally not used for data demodulation.

[0073] See Figure 3 When a system frame carries a PSFCH channel, the penultimate and third-to-last sideline symbols in that system frame are used for PSFCH transmission. Additionally, the sideline symbol preceding the PSFCH sideline symbol in the system frame is used as the GP.

[0074] Lateral CSI-RS

[0075] To better support unicast communication, NR-V2X supports the SL channel state information reference signal (CSI-RS). NR-V2X specifies that the SL CSI-RS will only be transmitted when the following three conditions are met.

[0076] Condition 1: The terminal device needs to send the PSSCH corresponding to the SL CSI-RS. In other words, the terminal device cannot just send the SL CSI-RS.

[0077] Condition 2: Sideline CSI reporting was activated via high-level signaling.

[0078] Condition 3: When sideline CSI reporting is activated by higher-layer signaling, the corresponding bit in the second-order SCI sent by the terminal device triggers sideline CSI reporting.

[0079] The maximum number of ports supported by SL CSI-RS is 2. When there are two ports, SL CSI-RS from different ports are multiplexed using code division on two adjacent REs of the same sideline symbol. Within a PRB, the number of SL CSI-RS per port is 1, i.e., the density is 1. Therefore, within a PRB, SL CSI-RS will appear on at most one sideline symbol, and the specific location of this sideline symbol is determined by the terminal equipment sending the SL CSI-RS.

[0080] Typically, to avoid affecting the resource mapping of PSCCH and second-order SCI, SL CSI-RS cannot be located on the same side row symbol as PSCCH and second-order SCI.

[0081] In addition, since the channel estimation accuracy of the sideline symbol where the PSSCH DMRS is located is high, and the SLCSI-RS of the two ports will occupy two consecutive resource elements (REs) in the frequency domain, the SL CSI-RS cannot be transmitted through the same sideline symbol as the PSSCH DMRS.

[0082] In some cases, the position of the side row symbol occupied by SL CSI-RS can be indicated by the sl-CSI-RS-FirstSymbol parameter in PC5RRC. Furthermore, the position of the first RE occupied by SL CSI-RS within a PRB is indicated by the "sl-CSI-RS-FreqAllocation" parameter in PC5RRC. If SL CSI-RS corresponds to one port, this parameter is a 12-bit bitmap corresponding to 12 REs within a PRB. If SL CSI-RS corresponds to two ports, this parameter is a 6-bit bitmap, in which case SL CSI-RS occupies two REs, 2f(1) and 2f(1)+1, where f(1) represents the identifier of the bit with a value of 1 in the aforementioned bitmap.

[0083] The frequency domain location occupied by SL CSI-RS is also determined by the terminal equipment that sends SL CSI-RS, and it is important to note that the determined frequency domain location of SL CSI-RS must not conflict with the frequency domain location occupied by PT-RS.

[0084] Figure 4 A schematic diagram showing the time-frequency resources occupied by SL CSI-RS is shown. See also Figure 4 Assuming the number of ports corresponding to SL CSI-RS is 2, sl-CSI-RS-FirstSymbol indicates the position 8 of the side row symbol occupied by SL CSI-RS, and sl-CSI-RS-FreqAllocation indicates the position of the first RE occupied by SL CSI-RS within a PRB as [b5,b4,b3,b2,b1,b0] = [0,0,0,1,0,0].

[0085] Multibeam system in NR system

[0086] Communication systems (e.g., NR) are designed with the goal of high-frequency bands (e.g., above 6 GHz) and high bandwidth communication. As the operating frequency increases, path loss during transmission increases, affecting the coverage capability of the high-frequency system. Therefore, to effectively guarantee high-frequency coverage, an effective technical solution is to use massive MIMO (Massive Multiple-in Multiple-out) antenna arrays to form shaped beams with higher gain, overcoming propagation loss and ensuring the coverage of the communication system.

[0087] Currently, the most common large-scale antenna arrays are millimeter-wave antenna arrays. Because millimeter-wave antenna arrays emit shorter wavelengths, the spacing between antenna elements can be shorter, and the aperture of the antenna elements can be smaller, so that more physical antenna elements can be integrated into a two-dimensional antenna array of finite size.

[0088] In addition, due to the limited size of millimeter-wave antenna arrays, digital beamforming cannot be used due to factors such as hardware complexity, cost, and power consumption. Instead, analog beamforming is usually used, which can enhance network coverage while reducing the implementation complexity of the equipment.

[0089] To facilitate understanding of multibeam systems, the following section will combine... Figures 5 to 6 Taking the scenario of communication between network devices and terminals as an example, this paper introduces the communication process based on beam communication.

[0090] See Figure 5 In traditional communication systems (e.g., 4G communication systems), a relatively wide beam 510 is typically used to cover the entire cell (or "sector"). This allows terminals within the cell (e.g., terminals 511-515) to communicate with network equipment at any given time, for example, to obtain transmission resources allocated by the network equipment.

[0091] See Figure 6 In newer communication systems (e.g., NR), a multi-beam system 610 can be used to cover the entire cell. That is, each beam in the multi-beam system (e.g., beams 611 to 614) covers a smaller area in the cell, and the effect of multiple beams covering the entire cell is achieved by beam sweeping.

[0092] During beam scanning, different beams are used at different times to cover different areas within the cell. For example, at time 1, the communication system can cover the area where terminal 1 is located using beam 611. At time 2, the communication system can cover the area where terminal 2 is located using beam 612. At time 3, the communication system can cover the areas where terminals 3 and 4 are located using beam 613. At time 4, the communication system can cover the area where terminal 5 is located using beam 614.

[0093] For multi-beam systems, the use of narrower beams allows for more concentrated energy transmission, thus enabling coverage over greater distances. However, precisely because the beams are narrower, each beam can only cover a portion of the cell; therefore, multi-beam systems can be understood as "trading time for space."

[0094] Typically, the beam used by the transmitting end to send signals is called the "transmit beam," and the beam used by the receiving end to receive signals is called the "receive beam."

[0095] In some cases, the aforementioned transmitting beam can also be referred to as a spatial domain transmission filter, and correspondingly, the aforementioned receiving beam can also be referred to as a spatial domain reception filter. In other cases, the aforementioned transmitting beam can also be referred to as a spatial domain transmission parameter, and correspondingly, the aforementioned receiving beam can also be referred to as a spatial domain reception parameter. For ease of understanding, the embodiments of this application mainly use beams as an example for description.

[0096] In network device-terminal communication scenarios, if both the network device and the terminal support multi-beam transmission, they need to select appropriate transmit and receive beams through processes such as beam selection and beam measurement before communicating. For example, during transmit beam selection, the network device can use different transmit beams to transmit multiple reference signals in turn, each with different resources. Correspondingly, the terminal also uses multiple receive beams to receive these reference signals and measures them to obtain measurement results. Then, the terminal selects a subset of the detected reference signals and feeds back the resource identifiers and corresponding measurement results of these subsets to the network device, enabling the network device to select a suitable transmit beam for subsequent communication with the terminal.

[0097] Typically, after a network device selects a suitable transmit beam, the terminal needs to select a receive beam that matches that transmit beam to communicate with the network device. Currently, communication protocols specify that the transmit beam selected by the network device can be indicated through the quasi-co-coated (QCL) information in the transmission configuration indicator (TCI) state.

[0098] QCL in NR system

[0099] Typically, antenna ports are used to characterize the state of a wireless channel. Signals on different antenna ports naturally experience different channel states. However, even so, the channels on different antenna ports may still share certain common properties, which can be called large-scale channel properties. Based on this, we introduce the concept of Quasi-Co-location (QCL): if the large-scale channel properties of the channel traversed by a symbol on one antenna port can be inferred from the channel traversed by a symbol on another antenna port, then the two antenna ports are said to be quasi-co-located.

[0100] For example, two different signals may be transmitted from two very close antenna ports. Due to fading, they may experience different side-channel states, but the large-scale parameters of the two channels may be the same. In this case, although the two signals correspond to different antenna ports, they are quasi-co-located.

[0101] The aforementioned large-scale channel properties include: Doppler shift, Doppler spread, average delay, delay spread, and spatial RX parameter.

[0102] Among them, the spatial reception parameters correspond to a series of spatial reception attributes and are mainly used in frequency bands above 6 GHz. This is because NR frequency bands above 6 GHz use hybrid analog-digital beamforming, and the direction and width of the analog beam affect the large-scale characteristics of the channel. Therefore, this parameter is introduced to characterize the impact of the beam on channel characteristics. If the spatial reception parameters of two reference signals are quasi-co-located, then the network device transmits them through the same transmit beam, meaning that the terminal can receive both reference signals using the same receive beam.

[0103] TCI status in NR system

[0104] To improve the receiving performance of a terminal, the terminal can leverage the characteristics of the transmission environment to refine its receiving algorithm. For example, the statistical characteristics of the channel can be used to optimize the design and parameters of the channel estimator. Typically, these characteristics of signal transmission can be represented by QCL information (QCL-Info) in the TCI state.

[0105] In NR systems, if the transmission beam of the transmitted signal is different, the characteristics of the transmission environment corresponding to the signal transmission may also change. Therefore, before transmitting the signal, the network device will indicate the corresponding QCL status information to the terminal through the TCI status.

[0106] Typically, the TCI status can include a TCI status identifier (ID) and / or QCL information. The TCI status identifier identifies the TCI status. The QCL information can include QCL type configuration and QCL reference signal configuration.

[0107] The QCL type configuration mentioned above can include QCL type A, QCL type B, QCL type C, or QCL type D. The definitions of the different QCL type configurations are as follows.

[0108] QCL Type A: {Doppler offset, Doppler spread, average delay, delay spread}

[0109] QCL-TypeB: {Doppler offset, Doppler extension}

[0110] QCL Type C: {Doppler offset, average delay}

[0111] QCL Type D (QCL-TypeD): {Spatial Receive Parameters}.

[0112] The QCL reference signal configuration mentioned above may include the identifier of the bandwidth part (BWP) where the reference signal is located and the identifier of the reference signal. The identifier of the reference signal may be the synchronization signal and physical broadcast channel block (SSB) index and / or the resource identifier of CSI-RS.

[0113] Currently, the communication protocol specifies that the pseudocode for the above TCI state can be as follows.

[0114]

[0115] As described above, in an NR system, network devices can instruct terminals to transmit beams by indicating the TCI state. If the network device configures the identifier of the reference signal quasi-co-located with the signal to be transmitted to be 1 through the TCI state, and the QCL type is type A, type B, or type C, then the terminal can assume that the signal to be transmitted and the reference signal with the identifier 1 have the same large-scale channel parameters, and the large-scale channel parameters can be determined by the QCL type in the TCI state.

[0116] If the network device configures the reference signal quasi-co-located with the signal to be transmitted to be identified as 1 through the TCI state configuration, and the QCL type is QCL type D, then the receiving beam used by the terminal to receive the signal to be transmitted is the same as the receiving beam used to receive the reference signal identified as 1.

[0117] Multibeam systems in side-link communication scenarios

[0118] Based on the advantages of multi-beam systems described above, we hope to introduce multi-beam systems into sidelink communication scenarios as well. That is, the aforementioned multi-beam systems can also be applied to the transmitting and / or receiving terminals in sidelink communication. The beam selection process in sidelink communication scenarios will be described below.

[0119] If the terminal acting as the transmitter (also known as the first terminal) and / or the terminal acting as the receiver (also known as the second terminal) in sidelink communication can support multi-beam transmission, then before the first terminal transmits sidelink data, both the first and second terminals need to select appropriate transmit and receive beams through processes such as beam selection and beam measurement. For ease of understanding, the following will first combine... Figure 7 This paper introduces the beam selection process in a scenario where the first terminal supports multi-beam transmission and the second terminal uses the same beam transmission.

[0120] See Figure 7 Assume the first terminal supports four transmit beams 0-3. During beam selection, the first terminal uses different transmit beams 0-3 to transmit multiple side-path reference signals in turn, with different identifiers (e.g., resource identifiers) for each signal. Correspondingly, the second terminal uses the same receive beam to receive the multiple side-path reference signals transmitted via transmit beams 0-3 and measures the detected signals to obtain measurement results. Then, the second terminal selects N side-path reference signals from the detected signals and feeds back the identifiers of these N signals and their corresponding measurement results to the first terminal, allowing the first terminal to select a suitable transmit beam for subsequent transmission of side-path data. For example, the first terminal selects the beam corresponding to the side-path reference signal with the optimal measurement result as the transmit beam.

[0121] In some scenarios, the second terminal can also support multi-beam transmission. For example, suppose the second terminal supports four receiving beams (0-3). In this case, the second terminal also needs to use each receiving beam in turn to receive the lateral reference signals transmitted by the first terminal. Assume the first terminal supports four transmitting beams (0-3), and the second terminal supports four receiving beams (0-3). During the transmitting beam selection process, the first terminal uses different transmitting beams (0-3) to transmit multiple lateral reference signals in turn, and these signals have different identifiers. Correspondingly, the second terminal uses receiving beams (0-3) to receive the multiple lateral reference signals transmitted through transmitting beams (0-3) respectively, and measures the detected lateral reference signals to obtain measurement results. In one possible implementation, the second terminal can first use receive beam 0 to receive multiple side reference signals transmitted by transmit beams 0 to 3. Then, the second terminal can use receive beam 1 to receive multiple side reference signals transmitted by transmit beams 0 to 3. Then, the second terminal can use receive beam 2 to receive multiple side reference signals transmitted by transmit beams 0 to 3. Finally, the second terminal can use receive beam 3 to receive multiple side reference signals transmitted by transmit beams 0 to 3.

[0122] After obtaining the measurement results, the second terminal can select N side-path reference signals from the detected signals based on the measurement results. It then feeds back the identifiers of these N side-path reference signals and their corresponding measurement results to the first terminal, allowing the first terminal to select a suitable transmission beam as the transmission beam for subsequent side-path data transmission. For example, the first terminal can select the beam corresponding to the side-path reference signal with the optimal measurement result as the transmission beam.

[0123] As described above, the identifiers of the side reference signals transmitted by different beams are different. Therefore, for the second terminal that supports 4 receiving beams and the first terminal that supports 4 transmitting beams, it is necessary to transmit side reference signals with 16 different identifiers in order to complete the alternating pairing of all transmitting and receiving beams.

[0124] It should be understood that the above-described process for determining the transmit beam and receive beam is merely an exemplary illustration, and the embodiments in this application do not limit the method for determining the transmit beam and receive beam.

[0125] The aforementioned lateral reference signal can be a reference signal used for beam selection and beam measurement. The aforementioned lateral reference signal can be one or more of CSI-RS, PSCCH DMRS, PSSCH DMRS, and phase tracking reference signal (PT-RS).

[0126] However, after the first terminal selects a suitable transmit beam as the transmit beam for subsequent transmission of side data based on the measurement results, if the second terminal cannot know the selection result of the first terminal, it cannot select a receive beam that matches the aforementioned transmit beam as the receive beam for subsequent transmission of data, resulting in a reduction in the communication quality of the side link.

[0127] Therefore, this application provides a communication method to indicate the receiving beam used when receiving sidelink data to the second terminal by sending indication information to the second terminal, so as to improve the communication quality of the sidelink between the first terminal and the second terminal.

[0128] The following will combine Figure 8 The flowchart of the communication method according to the embodiments of this application is described. Figure 8 The communication method shown includes steps S810 and S820.

[0129] In step S810, the first terminal generates indication information.

[0130] In step S820, the first terminal sends instruction information to the second terminal.

[0131] The description of the function of the above-mentioned instruction information may differ in different situations. The following section introduces the function of the above-mentioned instruction information from six aspects.

[0132] I. The above indication information is used to indicate the first TCI state.

[0133] The first TCI state is used to indicate the receive beam used by the second terminal for receiving cross-line data. Alternatively, the first TCI state is used to indicate the transmit beam used by the first terminal for transmitting cross-line data, and accordingly, the second terminal can determine the receive beam for receiving cross-line data based on the transmit beam.

[0134] The transmit beam and / or receive beam indicated by the first TCI state can be selected through the beam selection process described above. Of course, the transmit beam and / or receive beam can also be selected using other beam selection methods, and this application embodiment does not limit this.

[0135] The transmit beam indicated by the first TCI state can be either the optimal transmit beam selected through the beam selection process, or a relatively optimal transmit beam selected through the same process. A relatively optimal transmit beam can be understood as one whose measurement result of the side-following reference signal transmitted through that transmit beam is higher than a preset threshold. The preset threshold could be, for example, a preset received power or a preset signal energy. An optimal transmit beam can be understood as one whose measurement result of the side-following reference signal transmitted through that transmit beam is better than the measurement result of the side-following reference signal transmitted through other beams during the beam selection process.

[0136] The receiving beam indicated by the first TCI state can be either the optimal receiving beam selected through the beam selection process, or a relatively optimal receiving beam selected through the same process. A relatively optimal receiving beam can be understood as one whose measurement result of the side-following reference signal received through that beam is higher than a preset threshold. The preset threshold could be, for example, a preset received power or a preset signal energy. An optimal receiving beam can be understood as one whose measurement result of the side-following reference signal transmitted through that beam is better than the measurement result of the side-following reference signal received through other beams during the beam selection process.

[0137] In some cases, the aforementioned transmit beam can be replaced by a spatial transmit filter, and the aforementioned receive beam can be replaced by a spatial receive filter. That is, the aforementioned first TCI state is used to indicate the spatial receive filter used by the second terminal for receiving line data. Alternatively, the first TCI state is used to indicate the spatial transmit filter used by the first terminal for transmitting line data, and correspondingly, the second terminal can determine the spatial receive filter for receiving line data based on the spatial transmit filter.

[0138] In other cases, the aforementioned transmit beam can be replaced by spatial transmit parameters, and the aforementioned receive beam can be replaced by spatial receive parameters. That is, the aforementioned first TCI state is used to indicate the spatial receive parameters used by the second terminal for receiving cross-line data. Alternatively, the first TCI state is used to indicate the spatial transmit parameters used by the first terminal for transmitting cross-line data, and correspondingly, the second terminal can determine the spatial receive parameters for receiving cross-line data based on the spatial transmit parameters.

[0139] The aforementioned first TCI state may include the identifier of the sideline reference signal and / or QCL information (QCL-Info). The QCL information may be the QCL type (qcl-Type). The QCL type includes QCL type A, QCL type B, QCL type C, and QCL type D. When the QCL type is QCL type D, the first TCI state can be used to indicate the receive beam used by the second terminal to receive sideline data, or in other words, the first TCI state can be used to indicate the transmit beam used by the first terminal to transmit sideline data.

[0140] The identifier for the sideline reference signal can be either the resource identifier (SL-RS-ResourceId) or the index of the sideline reference signal. In this case, the first TCI state indicates that the transmission beam of the sideline reference signal included in the first TCI state is the same as the transmission beam used for subsequent transmission of sideline data. Alternatively, the first TCI state indicates that the reception beam of the sideline reference signal included in the first TCI state is the same as the reception beam for subsequent sideline data. Or, the first TCI state instructs the second terminal to receive the sideline data transmitted by the first terminal using the same reception beam as the sideline reference signal included in the first TCI state.

[0141] In addition, the lateral reference signal included in the first TCI state mentioned above can be the lateral reference signal introduced in the multi-beam system in the lateral link scenario described above. For the sake of brevity, it will not be repeated here.

[0142] Of course, in some implementations, the first TCI state may also include a TCI state identifier (TCI-StateId), which is used to identify the TCI state.

[0143] In some other implementations, when the terminal can communicate on multiple sideline BWPs, the TCI states configured on different sideline BWPs may also be different. Therefore, the first TCI state can also indicate the BWP associated with the first TCI state. For example, the first TCI state can include the identifier (bwp-Id) of the BWP, and the identifier of the BWP can be used to indicate the sideline BWP associated with the first TCI state.

[0144] In some other implementations, when the terminal can communicate on multiple sidecarriers, the TCI states configured on different sidecarriers may also be different. Therefore, the first TCI state can also indicate the sidecarrier associated with the first TCI state, for example, including the identifier (carrier-ID) of the sidecarrier, and the sidecarrier corresponding to the first TCI state is indicated by the identifier of the sidecarrier.

[0145] In some implementations, the pseudocode corresponding to the first TCI state mentioned above can be as follows.

[0146]

[0147] In some implementations, the pseudocode corresponding to the above QCL information (QCL-Info) can be as follows.

[0148]

[0149] II. The above-mentioned instruction information is used to instruct the second terminal to use the first spatial domain receiving filter to receive sideline data. The first spatial domain receiving filter is the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal.

[0150] The aforementioned first side-link reference signal can be the side-link reference signal introduced in the previous section on multi-beam systems in side-link communication scenarios. For the sake of brevity, it will not be repeated here.

[0151] The aforementioned target spatial domain receiving filter (also known as the "target receiving beam") can be selected through the receiving beam selection process described above. For example, based on the receiving beam selection process described above, the aforementioned target spatial domain receiving filter can be selected by the second terminal from multiple spatial domain receiving filters supported by the second terminal based on the measurement results. Of course, the aforementioned target spatial domain receiving filter can also be selected in other ways, and this application embodiment does not limit this.

[0152] The aforementioned target spatial receiving filter can be either the optimal spatial receiving filter or a relatively optimal spatial receiving filter. A relatively optimal spatial receiving filter can be understood as one whose measurement result of the side-following reference signal received through this filter is higher than a preset threshold. The preset threshold could be, for example, a preset received power or a preset signal energy. An optimal spatial receiving filter can be understood as one whose measurement result of the side-following reference signal received through this filter is better than the measurement results of the side-following reference signal received by other spatial receiving filters supported by the second terminal.

[0153] For example, see Figure 7 Assuming the second terminal provides feedback on the resources and corresponding measurement results for the aforementioned N side-link reference signals, and the first terminal determines that the measurement result of resource 1 of the side-link reference signal is optimal based on the measurement results, then the aforementioned target spatial domain receiving filter can be the spatial domain receiving filter used by the second terminal to receive the side-link reference signal corresponding to resource 1 of the side-link reference signal.

[0154] For example, see also Figure 7Suppose the second terminal provides feedback on the resources and corresponding measurement results for the aforementioned N side-link reference signals. Based on the measurement results, the first terminal determines that the measurement results for resources 2 and 3 of the side-link reference signals are superior. However, the measurement results for resources 2 and 3 are inferior to those for resource 1. For some reason, the first terminal does not use the spatial transmission filter corresponding to resource 1 of the side-link reference signals. Consequently, the second terminal cannot use the spatial reception filter corresponding to resource 1 of the side-link reference signals. In this case, the first terminal can arbitrarily select a spatial transmission filter from the spatial transmission filters corresponding to resources 2 and 3 of the side-link reference signals. Suppose the first terminal selects the spatial transmission filter corresponding to resource 2 of the side-link reference signals and instructs the second terminal of the selection result via the TCI status. Accordingly, the second terminal uses the spatial reception filter corresponding to resource 2 of the side-link reference signals to receive the side-link data based on this TCI status. That is to say, the spatial reception filter corresponding to resource 2 of the side-link reference signals is the aforementioned target spatial reception filter.

[0155] It should be noted that some of the reasons mentioned above may include changes in the transmission conditions of the sideline data, causing the spatial transmission filter corresponding to resource 1 of the sideline reference signal to become unavailable. Alternatively, some of the reasons mentioned above may also include the first terminal being able to simultaneously transmit sideline data to the second terminal and other terminals through other spatial transmission filters, resulting in the first terminal not using the spatial transmission filter corresponding to resource 1 of the sideline reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include sideline reference signal resource 1 and sideline reference signal resource 2, and the sideline reference signal resources fed back by the third terminal to the first terminal include sideline reference signal resource 2 and sideline reference signal resource 3. Furthermore, the first terminal needs to simultaneously transmit sideline data (e.g., sideline feedback information) to the second terminal and the third terminal in a certain time slot. In this case, in order to simultaneously transmit sideline data to the second terminal and the third terminal, the first terminal can select the spatial transmission filter corresponding to reference signal resource 2 for transmission.

[0156] Third, the above-mentioned instruction information is used to instruct the first terminal to use the first spatial domain transmission filter to transmit sideline data. The first spatial domain transmission filter is the target spatial domain transmission filter used by the first terminal to transmit the first sideline reference signal.

[0157] The aforementioned first side-link reference signal can be the side-link reference signal introduced in the previous section on multi-beam systems in side-link communication scenarios. For the sake of brevity, it will not be repeated here.

[0158] The aforementioned target spatial domain transmission filter (also known as the "target transmission beam") can be selected through the beam selection process described above. For example, based on the transmission beam selection process described above, the aforementioned target spatial domain transmission filter can also be selected by the first terminal based on the measurement results fed back by the second terminal. Of course, the aforementioned target spatial domain transmission filter can also be selected using other methods, and this application embodiment does not limit this.

[0159] The aforementioned target airspace transmission filter can be either the optimal airspace transmission filter or a relatively optimal airspace transmission filter. A relatively optimal airspace transmission filter can be understood as one whose measurement result of the side-flying reference signal transmitted through this airspace transmission filter is higher than a preset threshold. The preset threshold could be, for example, a preset transmission power or a preset signal energy. An optimal airspace transmission filter can be understood as one whose measurement result of the side-flying reference signal transmitted through this airspace transmission filter is better than the measurement result of the side-flying reference signal transmitted through other airspace transmission filters supported by the first terminal.

[0160] For example, see Figure 7 Assuming the second terminal provides feedback on the measurement results of the resources of the above N side reference signals, and the first terminal determines that the measurement result of resource 1 of the side reference signal is optimal based on the measurement results, then the above target spatial transmission filter can be the spatial transmission filter used by the side reference signal corresponding to resource 1 of the side reference signal transmitted by the second terminal.

[0161] For example, see also Figure 7 Suppose the second terminal provides the measurement results for the resources of the aforementioned N side-link reference signals. Based on the measurement results, the first terminal determines that the measurement results of resources 2 and 3 of the side-link reference signals are better. However, the measurement results of resources 2 and 3 of the side-link reference signals are worse than the measurement results of resources 1 of the side-link reference signals. But for some reason, the first terminal does not use the spatial transmission filter corresponding to resource 1 of the side-link reference signals. In this case, the first terminal can arbitrarily select one spatial transmission filter from the spatial transmission filters corresponding to resources 2 and 3 of the side-link reference signals as the aforementioned target spatial transmission filter.

[0162] It should be noted that some of the reasons mentioned above may include changes in the transmission conditions of the sideline data, causing the spatial transmission filter corresponding to resource 1 of the sideline reference signal to become unavailable. Alternatively, some of the reasons mentioned above may also include the first terminal being able to simultaneously transmit sideline data to the second terminal and other terminals through other spatial transmission filters, resulting in the first terminal not using the spatial transmission filter corresponding to resource 1 of the sideline reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include sideline reference signal resource 1 and sideline reference signal resource 2, and the sideline reference signal resources fed back by the third terminal to the first terminal include sideline reference signal resource 2 and sideline reference signal resource 3. Furthermore, the first terminal needs to simultaneously transmit sideline data (e.g., sideline feedback information) to the second terminal and the third terminal in a certain time slot. In this case, in order to simultaneously transmit sideline data to the second terminal and the third terminal, the first terminal can select the spatial transmission filter corresponding to reference signal resource 2 for transmission.

[0163] Fourth, the above-mentioned instruction information is used to instruct the second terminal to receive sideline data using the first spatial domain receiving parameters. The first spatial domain receiving parameters are the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal.

[0164] The aforementioned first side-link reference signal can be the side-link reference signal introduced in the previous section on multi-beam systems in side-link communication scenarios. For the sake of brevity, it will not be repeated here.

[0165] The aforementioned target spatial domain receiving parameters (also referred to as "target receiving beams") can be selected through the beam selection process described above. For example, based on the receiving beam selection process described above, the aforementioned target spatial domain receiving parameters can be selected by the second terminal from multiple spatial domain receiving parameters based on measurement results. Of course, the aforementioned target spatial domain receiving parameters can also be selected in other ways, and this application embodiment does not limit this.

[0166] The aforementioned target airspace reception parameters can be either the optimal airspace reception parameters or the relatively optimal airspace reception parameters. The relatively optimal airspace reception parameters can be understood as those whose measurement results of the lateral reference signal received through these parameters are higher than a preset threshold. The preset threshold could be, for example, a preset received power or a preset signal energy. The optimal airspace reception parameters can be understood as those whose measurement results of the lateral reference signal received through these parameters are better than the measurement results of the lateral reference signal received through other airspace reception parameters supported by the second terminal.

[0167] For example, see Figure 7Assuming the second terminal provides the measurement results for the resources of the aforementioned N lateral reference signals, and the first terminal determines that the measurement result of resource 1 of the lateral reference signal is optimal based on the measurement results, then the aforementioned target spatial reception parameters can be the spatial reception parameters used by the second terminal to receive the lateral reference signal corresponding to resource 1 of the lateral reference signal.

[0168] For example, see also Figure 7 Suppose the second terminal provides measurement results for the resources of the aforementioned N side-link reference signals. Based on these results, the first terminal determines that the measurement results for resources 2 and 3 of the side-link reference signals are superior. However, the measurement results for resources 2 and 3 are inferior to those for resource 1. For some reason, the first terminal does not use the spatial transmission parameters corresponding to resource 1 of the side-link reference signals. Consequently, the second terminal cannot use the spatial reception parameters corresponding to resource 1 either. In this case, the first terminal can arbitrarily select a spatial transmission parameter from the spatial transmission parameters corresponding to resources 2 and 3 of the side-link reference signals. Suppose the first terminal selects the spatial transmission parameter corresponding to resource 2 of the side-link reference signals and instructs the second terminal of the selection result via the TCI state. Accordingly, the second terminal uses the spatial reception parameters corresponding to resource 2 of the side-link reference signals to receive side-link data based on this TCI state. That is, the spatial reception parameters corresponding to resource 2 of the side-link reference signals are the aforementioned target spatial reception parameters.

[0169] It should be noted that some of the reasons mentioned above may include changes in the transmission conditions of the sideline data, causing the spatial reception parameters corresponding to resource 1 of the sideline reference signal to become unavailable. Alternatively, some of the reasons mentioned above may also include the first terminal simultaneously transmitting sideline data to the second terminal and other terminals through other spatial transmission filters, resulting in the first terminal not using the spatial transmission parameters corresponding to resource 1 of the sideline reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include sideline reference signal resource 1 and sideline reference signal resource 2, and the sideline reference signal resources fed back by the third terminal to the first terminal include sideline reference signal resource 2 and sideline reference signal resource 3. Furthermore, the first terminal needs to simultaneously transmit sideline data to the second terminal and the third terminal in a certain time slot (e.g., sideline feedback information). In this case, in order to simultaneously transmit sideline data to the second terminal and the third terminal, the first terminal can select the spatial transmission parameters corresponding to reference signal resource 2 for transmission.

[0170] Fifth, the above-mentioned instruction information is used to instruct the first terminal to send sideline data using the first airspace transmission parameters, and the first airspace transmission parameters are the same as the target airspace transmission parameters used by the first terminal to send the first sideline reference signal.

[0171] The aforementioned first side-link reference signal can be the side-link reference signal introduced in the previous section on multi-beam systems in side-link communication scenarios. For the sake of brevity, it will not be repeated here.

[0172] The aforementioned target airspace transmission parameters (also referred to as "target transmission beams") can be selected through the beam selection process described above. For example, based on the beam selection process described above, the aforementioned target airspace transmission parameters can be selected by the second terminal from multiple airspace transmission parameters based on measurement results. As another example, based on the beam selection process described above, the aforementioned target airspace transmission parameters can also be selected by the first terminal based on measurement results fed back by the second terminal. Of course, the aforementioned target airspace transmission parameters can also be selected using other methods, and this application embodiment does not limit this.

[0173] The aforementioned target airspace transmission parameters can be either the optimal airspace transmission parameters or the relatively optimal airspace transmission parameters. The relatively optimal airspace transmission parameters can be understood as the measurement results of the lateral reference signal transmitted using these parameters exceeding a preset threshold. The preset threshold could be, for example, a preset transmission power or a preset signal energy. The optimal airspace transmission parameters can be understood as the measurement results of the lateral reference signal transmitted using these parameters being superior to the measurement results of lateral reference signals transmitted using other airspace transmission parameters supported by the first terminal.

[0174] For example, see Figure 7 Assuming the second terminal provides the measurement results for the resources of the aforementioned N lateral reference signals, and the first terminal determines that the measurement result of resource 1 of the lateral reference signal is optimal based on the measurement results, then the aforementioned target spatial transmission parameters can be the spatial transmission parameters used by the lateral reference signal corresponding to resource 1 of the lateral reference signal transmitted by the second terminal.

[0175] For example, see also Figure 7 Suppose the second terminal provides the measurement results for the resources of the aforementioned N lateral reference signals. Based on the measurement results, the first terminal determines that the measurement results of resources 2 and 3 of the lateral reference signals are better. However, the measurement results of resources 2 and 3 of the lateral reference signals are worse than the measurement results of resources 1 of the lateral reference signals. But for some reason, the first terminal does not use the spatial transmission parameters corresponding to resources 1 of the lateral reference signals. In this case, the first terminal can arbitrarily select one spatial transmission parameter from the spatial transmission parameters corresponding to resources 2 and 3 of the lateral reference signals as the aforementioned target spatial transmission parameter.

[0176] It should be noted that some of the above reasons may include changes in the transmission conditions of the sideline data, causing the spatial transmission parameters corresponding to resource 1 of the sideline reference signal to become unavailable. Alternatively, some of the above reasons may also include the first terminal being able to simultaneously transmit sideline data to the second terminal and other terminals using other spatial transmission parameters, resulting in the first terminal not using the spatial transmission parameters corresponding to resource 1 of the sideline reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include sideline reference signal resource 1 and sideline reference signal resource 2, and the sideline reference signal resources fed back by the third terminal to the first terminal include sideline reference signal resource 2 and sideline reference signal resource 3. Furthermore, the first terminal needs to simultaneously transmit sideline data (e.g., sideline feedback information) to the second terminal and the third terminal in a certain time slot. In this case, in order to simultaneously transmit sideline data to the second terminal and the third terminal, the first terminal can select the spatial transmission parameters corresponding to reference signal resource 2 for transmission.

[0177] VI. Indication information is used to indicate the identification of lateral reference signals.

[0178] Based on the above description, during beam selection and beam measurement, the first terminal transmits side-path reference signals with different identifiers for each transmit beam. Therefore, the first terminal can indicate the receive beam to the second terminal by including the identifier of the side-path reference signal in the indication information. Correspondingly, after receiving the identifier of the side-path reference signal, the second terminal can use the receive beam that receives that side-path reference signal to receive the side-path data transmitted by the first terminal. The identifier of the side-path reference signal may include a resource identifier or an index of the side-path reference signal.

[0179] It should be noted that in other cases, the indication information may also carry QCL type information, such as QCL type D, so as to instruct the second terminal to receive sideline data using the same receiving beam (or spatial receiving parameters, or spatial receiving filter) as the receiving sideline reference signal. Of course, if the second terminal is configured to know the QCL type information corresponding to the indication information through pre-configuration or pre-definition, the indication information may not need to carry QCL type information.

[0180] In this embodiment, the first terminal sends an indication message to the second terminal so that the second terminal can determine the receiving beam that matches the transmitting beam selected by the first terminal based on the indication message. This avoids the situation in traditional side-link communication scenarios where the second terminal cannot know the transmitting beam selected by the first terminal and therefore cannot select the receiving beam corresponding to the transmitting beam, which is beneficial to improving the communication quality of the side-link.

[0181] In some implementations, the aforementioned indication information can be carried in SCI, MAC CE, or PC5-Radio Resource Control (PC5-RRC) signaling.

[0182] If the first terminal only configures one TCI state for the second terminal each time, the receive beam indicated by that TCI state may no longer be applicable when the signal transmission conditions change, or when the channel quality changes. In this case, the first and second terminals need to go through another round of beam selection and beam measurement to select a suitable transmit beam and / or receive beam for sidelink communication. As a result, the sidelink data cannot be transmitted immediately, leading to a large transmission delay.

[0183] Therefore, to avoid the aforementioned problems, in this embodiment, the first terminal can configure TCI state set 1 through configuration information, and then indicate the first TCI state in TCI state set 1 through indication information. TCI state set 1 includes multiple TCI states. Thus, if it is necessary to adjust the current receiving beam (e.g., the receiving beam indicated by the first TCI state), the first terminal can directly instruct the second terminal to select a receiving beam indicated by another TCI state in TCI state set 1 to replace the receiving beam indicated by the first TCI state, thereby avoiding re-execution of the beam selection and beam measurement process and reducing the transmission delay of sideline data.

[0184] In some implementations, the aforementioned TCI state set 1 includes multiple TCI states. In some implementations, the aforementioned TCI state set 1 may include identifiers of multiple TCI states, indication information of reference signals associated with each of the multiple TCI states, and QCL type information. In other implementations, the aforementioned TCI state set 1 may include resource identifiers of reference signals associated with each of the multiple TCI states, and QCL type information. In other implementations, the aforementioned TCI state set 1 may include identifiers of multiple TCI states and identifiers of reference signals associated with each of the multiple TCI states. In other implementations, the aforementioned TCI state set 1 may include resource identifiers of reference signals associated with each of the multiple TCI states. The contents of TCI state set 1 will be described below with reference to Tables 1 to 4. For simplicity, further details will not be provided here.

[0185] In some implementations, the first terminal can configure the TCI state set 1 by sending configuration information 1 to the second terminal, and indicate to the second terminal which TCI state in the TCI state set 1 to use.

[0186] That is, before step S820 above, the first terminal can send configuration information 1 to the second terminal. Accordingly, the above indication information is used to instruct the second terminal to use the first TCI state in the first TCI set. Or, in other words, the above indication information is used to instruct the activation of the first TCI state in the first TCI set.

[0187] In this case, the aforementioned indication information can be the index of the first TCI state in TCI state set 1. Alternatively, the indication information can be the identifier of the first TCI state; this embodiment of the application does not limit this.

[0188] In some implementations, the configuration information 1 mentioned above is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE. Alternatively, the configuration information 1 mentioned above is carried in MAC CE, and the indication information is carried in SCI.

[0189] Typically, to facilitate the second terminal's parsing of configuration information 1, the total number M of TCI states in TCI state set 1 can be carried in configuration information 1. Of course, it is also possible not to carry the total number of TCI states in TCI state set 1 in configuration information 1, and this application embodiment does not limit this.

[0190] In some implementations, the maximum value of the total number M (or the corresponding number of bits) can be determined by the total number of resources of the sideline reference signal used during beam selection and beam measurement. For example, if the first terminal supports B transmit beams and the second terminal supports A receive beams, then the total number of resources of the sideline reference signal is A*B, that is, M = A*B.

[0191] In addition, in scenarios where the terminal supports multiple carriers, the TCI states configured on different carriers may be different. Therefore, configuration information 1 also includes the identifier of the sidecar carrier associated with TCI state set 1 to indicate the carrier corresponding to the first TCI state.

[0192] Similarly, when a terminal can communicate on multiple sideline BWPs, the TCI states configured on different sideline BWPs may also be different. Therefore, configuration information 1 may also include the identifier of the BWP associated with TCI state set 1 to indicate the sideline BWP corresponding to the first TCI state.

[0193] The following text combines Figures 9 to 12 This section describes the format of configuration information 1 and the contents of TCI status set 1. It should be noted that... Figures 9 to 12 In this text, "R" represents a placeholder, and "OCT" represents a byte.

[0194] Figure 9A schematic diagram of the format of configuration information 1 according to an embodiment of this application is shown. Assume that during beam selection and beam measurement, the first terminal uses the resources of 16 side-line reference signals. Therefore, the resource identifier of the side-line reference signals can be indicated in configuration information 1 using 4 bits. Since TCI state set 1 supports a total of 4 QCL types, 2 bits are reserved in configuration information 1 to indicate the QCL type included in each TCI state in the first TCI state.

[0195] Configuration information 1 may include the total number M of TCI states in TCI state set 1, the identifier of each TCI state in TCI state set 1, the identifier of the side-following reference signal included in each TCI state in TCI state set 1, and the QCL type included in each TCI state in TCI state set 1. Specifically, the identifier of each TCI state in TCI state set 1 includes: the identifier of the first TCI state, the identifier of the second TCI state, the identifier of the third TCI state, and the identifier of the fourth TCI state. The identifier of the side-following reference signal included in each TCI state in TCI state set 1 includes: the identifier of the first reference signal included in the first TCI state, the identifier of the second reference signal included in the second TCI state, the identifier of the third reference signal included in the third TCI state, and the identifier of the fourth reference signal included in the fourth TCI state.

[0196] Typically, to save on the overhead of transmitting configuration information 1, the association between the identifier of each TCI state in TCI state set 1 and the identifier of the side-line reference signal can be predefined or preconfigured in the second terminal. The following will use... Figure 10 Let's take an example to illustrate.

[0197] Figure 10 A schematic diagram of the format of configuration information 1 according to another embodiment of this application is shown. Assume that the identifiers of the four TCI states contained in TCI state set 1 are sequentially numbered starting from index 0, i.e., the identifiers of the four TCI states are identifier 0, identifier 1, identifier 2, and identifier 3. During beam selection and beam measurement, the first terminal uses the resources of 16 side-line reference signals. Therefore, the resource identifier of the side-line reference signals can be indicated in configuration information 1 using 4 bits. Furthermore, TCI state set 1 supports a total of four QCL types, so 2 bits can be reserved in configuration information 1 to indicate the QCL type contained in each TCI state within the first TCI state.

[0198] To reduce the overhead of transmitting configuration information 1, the identifiers of the sideline reference signals associated with the TCI states in the TCI state set can be sequentially indexed, starting from identifier 0. That is, TCI state identifier 0 is associated with the identifier of the first sideline reference signal, TCI state identifier 1 is associated with the identifier of the second sideline reference signal, TCI state identifier 2 is associated with the identifier of the third sideline reference signal, and TCI state identifier 3 is associated with the identifier of the fourth sideline reference signal.

[0199] At this time, configuration information 1 may include the total number M of TCI states contained in TCI state set 1, the identifier of the side reference signal contained in each TCI state in TCI state set 1, and the QCL type contained in each TCI state in TCI state set 1. The identifier of the side reference signal contained in each TCI state in TCI state set 1 includes: the identifier of the first reference signal contained in the first TCI state, the identifier of the second reference signal contained in the second TCI state, the identifier of the third reference signal contained in the third TCI state, and the identifier of the fourth reference signal contained in the fourth TCI state.

[0200] It should be noted that the association between the TCI status identifier and the side reference signal identifier can also be configured in a pre-configured or pre-defined manner, and this application embodiment does not limit this.

[0201] As mentioned above, if the QCLs contained in the various TCI states configured through configuration information 1 are the same, for example, all are QCL-TypeD, in order to save the overhead generated by transmitting configuration information 1, the QCL type can be configured in a predefined or pre-configured manner at the second terminal, without having to configure it again through configuration information 1, thus reducing the overhead generated by transmitting configuration information 1. The following will use... Figure 11 Let's take an example to illustrate.

[0202] Figure 11 A schematic diagram of the format of configuration information 1 according to another embodiment of this application is shown. It is assumed that during beam selection and beam measurement, the first terminal uses the resources of 16 side-line reference signals. Therefore, the resource identifier of the side-line reference signals can be indicated in configuration information 1 using 4 bits.

[0203] To reduce the overhead of transmitting configuration information 1, the QCL type of each TCI state in the TCI state set 1 can be pre-configured as Quasi-co-address type D in the second terminal.

[0204] At this time, configuration information 1 may include the total number M of TCI states included in TCI state set 1, and the identifier of the lateral reference signal included in each TCI state in TCI state set 1. The identifier of the lateral reference signal included in each TCI state in TCI state set 1 includes: the identifier of the first reference signal included in the first TCI state, the identifier of the second reference signal included in the second TCI state, the identifier of the third reference signal included in the third TCI state, and the identifier of the fourth reference signal included in the fourth TCI state.

[0205] Of course, to further reduce the overhead generated by transmitting configuration information 1, the QCL type included in each TCI state in TCI state set 1 can be predefined or pre-stored at the second terminal, and the identifiers of the sideline reference signals associated with them can be sequentially indexed starting from identifier 0 according to the identifier order of the TCI states in the TCI state set. The following text uses... Figure 12 Let's take an example to illustrate.

[0206] Figure 12 A schematic diagram of the format of configuration information 1 according to another embodiment of this application is shown. Assume that during beam selection and beam measurement, the first terminal uses the resources of 16 side-line reference signals. Therefore, the resource identifier of the side-line reference signals can be indicated in configuration information 1 using 4 bits. Since TCI state set 1 supports a total of 4 QCL types, 2 bits are reserved in configuration information 1 to indicate the QCL type included in each TCI state in the first TCI state.

[0207] To reduce the overhead of transmitting configuration information 1, the QCL type of each TCI state in the TCI state set 1 can be pre-configured as Quasi-co-address type D in the second terminal. Furthermore, following the identifier order of the TCI states in the TCI state set, the identifiers of the associated sideline reference signals are sequentially indexed starting from identifier 0. That is, identifier 0 of TCI state is associated with the identifier of the first sideline reference signal, identifier 1 of TCI state is associated with the identifier of the second sideline reference signal, identifier 2 of TCI state is associated with the identifier of the third sideline reference signal, and identifier 3 of TCI state is associated with the identifier of the fourth sideline reference signal.

[0208] At this time, configuration information 1 may include the total number M of TCI states contained in TCI state set 1, and the identifier of the side reference signal. The identifier of the side reference signal includes the identifier of the first reference signal, the identifier of the second reference signal, the identifier of the third reference signal, and the identifier of the fourth reference signal.

[0209] As mentioned above, after receiving the indication information, the second terminal can determine the receiving beam used for receiving the side-link data. If the time domain resources occupied by the indication information are not configured, the second terminal may not have enough time to process the indication information (e.g., demodulate) before receiving the side-link data, resulting in a decrease in the quality of side-link communication. For example, see... Figure 9 In a side-pass transmission system, since the PSCCH (carrying the first-order SCI) and PSSCH (carrying the second-order SCI) are transmitted in the same time slot, if the above indication information is carried in the first-order SCI associated with the PSSCH, the second terminal needs time to process the data after receiving the PSCCH. This may result in the second terminal being unable to parse the indication information from the first-order SCI in a timely manner in order to determine the receiving beam used to receive the PSSCH associated with the first-order SCI.

[0210] Therefore, to avoid the aforementioned problems, a third time interval can be configured between the transmission time of the indication information and the transmission time of the sideline data. This third time interval is used to represent the processing time, which is the time required for the second terminal to obtain the QCL information from the received SCI (or MAC CE) and apply it to the subsequent reception of sideline data. In some cases, the third time interval can be represented by the number of sideline symbols. In other cases, the third time interval can be represented by the number of time slots. For example, the aforementioned third time interval can be one time slot (14 symbols), or the aforementioned third time interval can also be defined as two time slots (28 symbols). The embodiments of this application do not limit the quantization method of the third time interval, and the third time interval can also be quantized using other time-domain units.

[0211] The aforementioned third time interval can be defined for the terminal in a predefined manner, or it can be configured for the terminal in a preconfigured manner. For example, the aforementioned third time interval can be defined by the parameter "timeDurationForQCL", see [link to documentation]. Figure 13 .

[0212] It should be understood that the aforementioned third time interval can be interpreted as the time interval between the transmission time of the indication information and the transmission time of the side data, or the time interval between the reception time of the indication information and the reception time of the side data, or the time interval between the transmission time of the indication information and the reception time of the side data, or the time interval between the reception time of the indication information and the transmission time of the side data. This application does not limit this interpretation.

[0213] As described above, after receiving configuration information 1 to configure TCI state set 1, the second terminal also needs to receive indication information to determine the first TCI state. If the time interval between the transmission of configuration information 1 and the transmission of indication information is too short, the second terminal may not have had time to process configuration information 1 to obtain TCI state set 1 before receiving the indication information, causing the processing of configuration information 1 to fail and making it impossible to obtain TCI state set 1.

[0214] Therefore, to avoid the above problems, the first time interval between the transmission time of the indication information and the transmission time of configuration information 1 can be configured to be greater than or equal to a first threshold. Alternatively, the time domain resources occupied by the indication information are no earlier than a first time domain resource, where the first time domain resource is determined based on the time domain resources occupied by configuration information 1 and the first time interval.

[0215] The first time interval between the transmission time of the aforementioned indication information and the transmission time of configuration information 1 can be understood as the time interval between the sending time of the indication information and the sending time of configuration information 1, or the time interval between the receiving time of the indication information and the receiving time of configuration information 1, or the time interval between the sending time of the indication information and the receiving time of configuration information 1, or the time interval between the receiving time of the indication information and the sending time of configuration information 1. This application embodiment does not limit this.

[0216] It should be understood that the aforementioned first threshold or first time interval can be configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by a first terminal, or indicated by a second terminal.

[0217] As described above, after the first terminal configures the TCI state set for the second terminal, it also needs to send indication information to the second terminal to indicate which TCI state in the TCI state set the second terminal should use. In this case, if the TCI state set configured by the first terminal for the second terminal contains a large number of TCI states, then more bits will be reserved in the indication information, leading to increased overhead in transmitting the indication information. For example, if the above TCI state set includes 4 TCI states, then 2 bits need to be reserved in the indication information to indicate the TCI state used by the second terminal. If the above TCI state set includes 16 TCI states, then 4 bits need to be reserved in the indication information to indicate the TCI state used by the second terminal.

[0218] Therefore, to avoid the aforementioned problems, after the first terminal configures TCI state set 1 for the second terminal, it can be further configured to activate only a subset of TCI state set 1, namely TCI state set 2. In this way, the first terminal can indicate the TCI state (first TCI state) used by the second terminal from TCI state set 2 using indication information. Because TCI state set 2 is a subset of TCI state set 1, the possibility of the indication information instructing the second terminal to use a TCI state is reduced, which helps to reduce the number of reserved bits in the indication information and reduce the overhead of transmitting the indication information.

[0219] It should be noted that, in the embodiments of this application, the scheme for configuring TCI state set 1 for the second terminal can refer to the scheme for configuring TCI state set 1 above. For the sake of brevity, it will not be repeated below. The following mainly introduces how to configure TCI state set 2 (i.e. subset) for the second terminal.

[0220] In some implementations, the first terminal can configure the aforementioned TCI state set 2 for the second terminal by sending configuration information 2. In some implementations, the configuration information 2 may include TCI state identification information, which indicates the identifier of the active TCI state in TCI state set 1. In other implementations, the configuration information 2 may also include a bitmap, the length of which can be determined based on the total number of TCI states in TCI state set 1. If a bit in the bitmap takes a first value, it indicates that the TCI state corresponding to the bit belongs to TCI state set 2. If a bit in the bitmap takes a second value, it indicates that the TCI state corresponding to the bit does not belong to TCI state set 2, where the first value and the second value are different.

[0221] The length of the bitmap described above is determined based on the total number of TCI states in TCI state set 1. This can include situations where the length of the bitmap is the same as the total number of TCI states in TCI state set 1, or in other words, the number of bits in the bitmap is equal to the total number of TCI states in TCI state set 1. In this case, each bit in the bitmap corresponds to one TCI state in TCI state set 1. Alternatively, the number of bits in the bitmap can also be an integer multiple of the total number of TCI states in TCI state set 1, for example, twice the total number of TCI states. In this case, every two bits in the bitmap correspond to one TCI state in TCI state set 1. This application does not limit this specific case.

[0222] Typically, to facilitate the second terminal's parsing of configuration information 2, the total number P of TCI states in TCI state set 2 can be carried in configuration information 2. Of course, it is also possible not to carry the total number P of TCI states in TCI state set 2 in configuration information 2, and this application embodiment does not limit this.

[0223] The following will combine Figures 14 to 15 The contents of configuration information 2 will be described separately. It should be noted that... Figures 14 to 15 In this text, "R" represents a placeholder, and "OCT" represents a byte.

[0224] Figure 14 This is a schematic diagram illustrating the format of configuration information 2 in an embodiment of this application. Assume that TCI state set 1 includes 16 TCI states. Therefore, the identifier of the TCI state can be indicated using 4 bits in configuration information 2. Furthermore, configuration information 2 is used to activate 4 TCI states in TCI state set 1 to form TCI state set 2.

[0225] In this case, configuration information 2 can carry the total number of TCI state set 2, as well as the identifiers of the four TCI states in TCI state set 2. Among them, the identifiers of the TCI states carried by configuration information 2 include: the identifier of the first TCI state, the identifier of the second TCI state, the identifier of the third TCI state, and the identifier of the fourth TCI state.

[0226] Figure 15 This is a schematic diagram illustrating the format of configuration information 2 according to another embodiment of this application. Assume that TCI state set 1 includes 16 TCI states. Therefore, configuration information 2 can use a bitmap containing 16 bits (T0 to T15) to indicate whether a TCI state belongs to TCI state set 2. Furthermore, configuration information 2 needs to activate 4 of these TCI states to form TCI state set 2.

[0227] The relationship between the bits in the bit diagram and the identifiers of the TCI states in TCI state set 1 is as follows: the identifier of the TCI state corresponding to bit T0 is 0, the identifier of the TCI state corresponding to bit T1 is 1, the identifier of the TCI state corresponding to bit T2 is 2, the identifier of the TCI state corresponding to bit T3 is 3, the identifier of the TCI state corresponding to bit T4 is 4, the identifier of the TCI state corresponding to bit T5 is 5, the identifier of the TCI state corresponding to bit T6 is 6, the identifier of the TCI state corresponding to bit T7 is 7, the identifier of the TCI state corresponding to bit T8 is 8, the identifier of the TCI state corresponding to bit T9 is 9, the identifier of the TCI state corresponding to bit T10 is 10, the identifier of the TCI state corresponding to bit T11 is 11, the identifier of the TCI state corresponding to bit T12 is 12, the identifier of the TCI state corresponding to bit T13 is 13, the identifier of the TCI state corresponding to bit T14 is 14, and the identifier of the TCI state corresponding to bit T15 is 15.

[0228] In this scenario, when configuration information 2 requires the activation of TCI states identified as 0 to 3, it is only necessary to set bits T0 to T3 in the bit diagram to the first value (e.g., 1) to indicate that TCI states identified as 0 to 3 belong to TCI state set 2. The remaining bits T4 to T15 are set to the second value (e.g., 0) to indicate that TCI states identified as 4 to 15 do not belong to TCI state set 2.

[0229] It should be noted that the above only lists the correspondence between the TCI state identifier and the bit position as an example. The TCI state identifier and the bit position can also correspond in other ways, and this application embodiment does not limit this.

[0230] In some implementations, if the above configuration information 1 is carried in PC5-RRC signaling, configuration information 2 can be carried in MAC CE, and indication information can be carried in SCI.

[0231] In some other implementations, if the above configuration information 1 is carried in PC5-RRC signaling, configuration information 2 can be carried in the first MAC CE, and indication information can be carried in the second MAC CE.

[0232] In some other implementations, if the above configuration information 1 is carried in PC5-RRC signaling, configuration information 2 can be carried in the first SCI, and indication information can be carried in the second SCI.

[0233] As described above, after receiving configuration information 1 to configure TCI state set 1, the second terminal also needs to receive configuration information 2 to determine TCI state set 2. If the time interval between the transmission of configuration information 1 and the transmission of configuration information 2 is too short, the second terminal may not have had time to process configuration information 1 to obtain TCI state set 1 before receiving configuration information 2, causing the processing of configuration information 1 to fail and making it impossible to obtain TCI state set 1.

[0234] Therefore, to avoid the above problems, a second time interval between the transmission time of configuration information 2 and the transmission time of configuration information 1 can be set to be greater than or equal to a second threshold. Alternatively, the time domain resources occupied by configuration information 2 should not be earlier than the second time domain resources, where the second time domain resources are determined based on the time domain resources occupied by configuration information 1 and the second time interval.

[0235] The second time interval between the transmission time of configuration information 2 and the transmission time of configuration information 1 can be understood as the time interval between the sending time of configuration information 2 and the sending time of configuration information 1, or the time interval between the receiving time of configuration information 2 and the receiving time of configuration information 1, or the time interval between the sending time of configuration information 2 and the receiving time of configuration information 1, or the time interval between the receiving time of configuration information 2 and the sending time of configuration information 1. This application embodiment does not limit this.

[0236] It should be understood that the aforementioned second threshold or second time interval can be configured in one or more of the following ways: pre-configured, predefined, network configured, indicated by the first terminal, or indicated by the second terminal.

[0237] In this embodiment, the second terminal receives the indication information to determine the first TCI state only after receiving the configuration information 2 and configuring the TCI state set 2. If the time interval between the transmission of the indication information and the transmission time of the configuration information 2 is too short, the second terminal may not have had time to process the configuration information 2 to obtain the TCI state set 2 before receiving the indication information, causing the processing of the configuration information 2 to fail and the TCI state set 2 to be unobtainable.

[0238] Therefore, to avoid the above problems, the fourth time interval between the transmission time of configuration information 2 and the transmission time of indication information can be configured to be greater than or equal to the third threshold. Alternatively, the time domain resources occupied by the indication information are no earlier than the third time domain resources, where the third time domain resources are determined based on the time domain resources occupied by configuration information 2 and the fourth time interval, where the fourth time interval is the time interval between the transmission time of configuration information 2 and the transmission time of indication configuration information.

[0239] The aforementioned fourth time interval can be understood as the time interval between the sending time of configuration information 2 and the sending time of indication information, or the time interval between the receiving time of configuration information 2 and the receiving time of indication information, or the time interval between the sending time of configuration information 2 and the receiving time of indication information, or the time interval between the receiving time of configuration information 2 and the sending time of indication information. This application embodiment does not limit this.

[0240] It should be understood that the aforementioned third threshold or fourth time interval can be configured in one or more of the following ways: pre-configured, predefined, network configured, indicated by the first terminal, or indicated by the second terminal.

[0241] As described above, the first terminal can configure TCI state set 1 for the second terminal by sending configuration information 1, and / or configure TCI state set 2 for the second terminal by sending configuration information 2. However, in some cases, the first terminal may not be able to know whether the second terminal has received the corresponding configuration information. Therefore, side feedback can be activated, allowing the second terminal to send feedback of the reception result to the first terminal, so that the first terminal can determine whether the second terminal has received the corresponding configuration information. For example, when the above configuration information 1 and configuration information 2 are transmitted via MAC CE, side feedback can be activated on the second terminal.

[0242] In other cases, when the first terminal sends indication information to the second terminal device, the first terminal may not be able to know whether the second terminal has received it. Therefore, the second terminal device can be activated to provide side feedback, allowing the second terminal to send back the reception result to the first terminal so that the first terminal can determine whether the second terminal has received the indication information. For example, when the aforementioned indication information is transmitted via SCI or MAC CE, the second terminal can be activated to provide side feedback.

[0243] The transmission resources occupied by the second terminal for side-line feedback can be found in [reference]. Figure 4 The description, for example, is carried in PSFCH. Of course, it can also be redefined, and the embodiments of this application do not limit it.

[0244] It should be understood that in the embodiments described above that configure TCI state set 1 and TCI state set 2, "configuration information 1" can also be referred to as "second configuration information," "configuration information 2" can also be referred to as "first configuration information," "TCI state set 1" can also be referred to as "second TCI state set," and "TCI state set 2" can also be referred to as "first TCI state set." In embodiments that only configure TCI state set 1, "configuration information 1" can also be referred to as "first configuration information," and "TCI state set 1" can also be referred to as "first TCI state set."

[0245] The above text combined Figures 1 to 15 The method embodiments of this application are described in detail below, in conjunction with... Figures 16 to 18 The present application provides a detailed description of the apparatus embodiments. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be found in the foregoing method embodiments.

[0246] Figure 16 This is a schematic diagram of the first terminal according to an embodiment of this application. Figure 16 The first terminal 1600 shown includes a generation unit 1610 and a transmission unit 1620.

[0247] Generation unit 1610 is used to generate instruction information;

[0248] The sending unit 1620 is used to send the indication information to the second terminal.

[0249] Wherein, the indication information is used to indicate the first transmission configuration indicating TCI status, or, the indication information is used to indicate the second terminal to use a first spatial domain receiving filter to receive sideline data, the first spatial domain receiving filter being the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate the first terminal to use a first spatial domain transmitting filter to transmit sideline data, the first spatial domain transmitting filter being the target spatial domain transmitting filter used by the first terminal to transmit the first sideline reference signal, or the indication information is used to indicate the second terminal to use first spatial domain receiving parameters to receive sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate the first terminal to use first spatial domain transmitting parameters to transmit sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to transmit the first sideline reference signal.

[0250] Optionally, the reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is quasi-co-address type D.

[0251] Optionally, the indication information is carried in the Sidelink Control Information (SCI), the Media Access Control and Control Unit (MAC CE), or the PC5-Radio Resource Control (PC5-RRC) signaling.

[0252] Optionally, the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state in the first TCI state set.

[0253] Optionally, the indication information is the identifier of the first TCI state in the first TCI state set.

[0254] Optionally, the sending unit 1620 is further configured to send first configuration information to the second terminal, the first configuration information being used to configure the first TCI state set.

[0255] Optionally, the first configuration information includes the total number of TCI states in the first TCI state set.

[0256] Optionally, the first configuration information may further include the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

[0257] Optionally, the TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

[0258] Optionally, the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than the first time domain resources, wherein the first time domain resources are determined based on the time domain resources occupied by the first configuration information and the first time interval.

[0259] Optionally, the first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

[0260] Optionally, the first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE, or the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

[0261] Optionally, the sending unit 1620 is further configured to send second configuration information to the second terminal, the second configuration information being used to configure a second TCI state set, wherein the first TCI state set is a subset of the second TCI state set.

[0262] Optionally, the first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

[0263] Optionally, a first value for a bit in the bitmap indicates that the TCI state corresponding to the bit belongs to the first TCI state set; a second value for a bit in the bitmap indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value and the second value are different.

[0264] Optionally, the second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or, the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval.

[0265] Optionally, the second threshold or the second time interval may be configured in one or more of the following ways: pre-configured, pre-defined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

[0266] Optionally, the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MACCE, and the indication information is carried in SCI.

[0267] Figure 17 This is a schematic diagram of the second terminal according to an embodiment of this application. Figure 17 The second terminal 1700 shown includes a receiving unit 1710 and a transmitting unit 1720.

[0268] The receiving unit 1710 is used to receive indication information sent by the first terminal;

[0269] The sending unit 1720 is used to receive side data sent by the first terminal based on the indication information.

[0270] Wherein, the indication information is used to indicate the first transmission configuration indicating TCI status, or, the indication information is used to indicate the second terminal to use a first spatial domain receiving filter to receive the sideline data, the first spatial domain receiving filter being the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate the first terminal to use a first spatial domain transmitting filter to transmit the sideline data, the first spatial domain transmitting filter being the target spatial domain transmitting filter used by the first terminal to transmit the first sideline reference signal, or the indication information is used to indicate the second terminal to use first spatial domain receiving parameters to receive the sideline data, the first spatial domain receiving parameters being the same as the target spatial domain receiving parameters used by the second terminal to receive the first sideline reference signal, or the indication information is used to indicate the first terminal to use first spatial domain transmitting parameters to transmit the sideline data, the first spatial domain transmitting parameters being the same as the target spatial domain transmitting parameters used by the first terminal to transmit the first sideline reference signal.

[0271] Optionally, the reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is quasi-co-address type D.

[0272] Optionally, the indication information is carried in the Sidelink Control Information (SCI), the Media Access Control and Control Unit (MAC CE), or the PC5-Radio Resource Control (PC5-RRC) signaling.

[0273] Optionally, the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state in the first TCI state set.

[0274] Optionally, the indication information is the identifier of the first TCI state in the first TCI state set.

[0275] Optionally, the receiving unit 1710 is further configured to receive first configuration information sent by the first terminal, the first configuration information being used to configure the first TCI state set.

[0276] Optionally, the first configuration information includes the total number of TCI states in the first TCI state set.

[0277] Optionally, the first configuration information may further include the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

[0278] Optionally, the TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

[0279] Optionally, the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than the first time domain resources, wherein the first time domain resources are determined based on the time domain resources occupied by the first configuration information and the first time interval.

[0280] Optionally, the first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

[0281] Optionally, the first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE, or the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

[0282] Optionally, the receiving unit 1710 is further configured to receive second configuration information sent by the first terminal, the second configuration information being used to configure a second TCI state set, wherein the first TCI state set is a subset of the second TCI state set.

[0283] Optionally, the first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

[0284] Optionally, a first value for a bit in the bitmap indicates that the TCI state corresponding to the bit belongs to the first TCI state set; a second value for a bit in the bitmap indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value and the second value are different.

[0285] Optionally, the second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or, the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval.

[0286] Optionally, the second threshold or the second time interval may be configured in one or more of the following ways: pre-configured, pre-defined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

[0287] Optionally, the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MACCE, and the indication information is carried in SCI.

[0288] Figure 18 This is a schematic structural diagram of a communication device according to an embodiment of this application. Figure 18 The dashed lines indicate that the unit or module is optional. The device 1800 can be used to implement the methods described in the above method embodiments. The device 1800 can be a chip, a terminal device, or a network device.

[0289] Apparatus 1800 may include one or more processors 1810. The processor 1810 may support apparatus 1800 in implementing the methods described in the preceding method embodiments. The processor 1810 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0290] The apparatus 1800 may further include one or more memories 1820. The memories 1820 store a program that can be executed by the processor 1810, causing the processor 1810 to perform the methods described in the preceding method embodiments. The memories 1820 may be independent of the processor 1810 or integrated within the processor 1810.

[0291] The device 1800 may also include a transceiver 1830. The processor 1810 can communicate with other devices or chips via the transceiver 1830. For example, the processor 1810 can send and receive data with other devices or chips via the transceiver 1830.

[0292] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0293] This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0294] This application also provides a computer program. This computer program can be applied to the terminal or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0295] In this application, the terms "system" and "network" are used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0296] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0297] In the embodiments of this application, the term "correspondence" may indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0298] In the embodiments of this application, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0299] In the embodiments of this application, the term "protocol" may refer to standard protocols in the field of communications, such as LTE protocols, NR protocols, and related protocols applied in future communication systems. This application does not limit the scope of these protocols.

[0300] In the embodiments of this application, determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0301] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0302] In the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0303] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0304] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0305] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0306] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially 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, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. 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 via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0307] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, include: The first terminal sends second configuration information to the second terminal, the second configuration information being used to configure a second TCI state set; The first terminal sends first configuration information to the second terminal. The first configuration information is used to configure a first TCI state set, wherein the first TCI state set is a subset of the second TCI state set, and a second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval. The first terminal generates indication information, which is generated based on the measurement results fed back by the second terminal; The first terminal sends the indication information to the second terminal, wherein the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than a first time domain resource, wherein the first time domain resource is determined based on the time domain resources occupied by the first configuration information and the first time interval. The indication information is used to indicate a first transmission configuration indication TCI state, wherein the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state in the first TCI state set, or The indication information is used to instruct the second terminal to use a first spatial domain receiving filter to receive sideline data. The first spatial domain receiving filter is the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal. The indication information is used to instruct the first terminal to transmit sideline data using a first spatial domain transmission filter. The first spatial domain transmission filter is the target spatial domain transmission filter used by the first terminal to transmit the first sideline reference signal. The indication information is used to instruct the second terminal to receive sideline data using first spatial domain reception parameters. The first spatial domain reception parameters are the same as the target spatial domain reception parameters used by the second terminal to receive the first sideline reference signal. The indication information is used to instruct the first terminal to send side data using the first spatial domain transmission parameters, wherein the first spatial domain transmission parameters are the same as the target spatial domain transmission parameters used by the first terminal to send the first side reference signal. There is a third time interval between the transmission time of the indication information and the transmission time of the side data.

2. The method as described in claim 1, characterized in that, The reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is QCL type D.

3. The method as described in claim 1, characterized in that, The indication information is carried in the Sideline Control Information (SCI), Media Access Control Unit (MAC CE), or PC5-Radio Resource Control (PC5-RRC) signaling.

4. The method as described in claim 1, characterized in that, The indication information is the identifier of the first TCI state in the first TCI state set.

5. The method as described in claim 1, characterized in that, The first configuration information includes the total number of TCI states in the first TCI state set.

6. The method as described in claim 1, characterized in that, The first configuration information also includes the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

7. The method as described in claim 1, characterized in that, The TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

8. The method as described in claim 1, characterized in that, The first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

9. The method as described in claim 1, characterized in that, The first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE, or The first configuration information is carried in MAC CE, and the indication information is carried in SCI.

10. The method as described in claim 1, characterized in that, The first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

11. The method as described in claim 10, characterized in that, The first value of a bit in the bit diagram indicates that the TCI state corresponding to the bit belongs to the first TCI state set. The second value of a bit in the bit diagram indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value is different from the second value.

12. The method as described in claim 1, characterized in that, The second threshold or the second time interval is configured in one or more of the following ways: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

13. The method as described in claim 1, characterized in that, The second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

14. A communication method, characterized in that, include: The second terminal receives second configuration information sent by the first terminal, the second configuration information being used to configure a second TCI state set; The second terminal receives first configuration information sent by the first terminal. The first configuration information is used to configure a first TCI state set, wherein the first TCI state set is a subset of the second TCI state set, and a second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval. The second terminal receives indication information sent by the first terminal, the indication information being generated based on the measurement results fed back by the second terminal; The second terminal receives side data sent by the first terminal based on the indication information, wherein the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than the first time domain resources, wherein the first time domain resources are determined based on the time domain resources occupied by the first configuration information and the first time interval. The indication information is used to indicate a first transmission configuration indication TCI state, wherein the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state in the first TCI state set, or The indication information is used to instruct the second terminal to receive the sideline data using a first spatial domain receiving filter, wherein the first spatial domain receiving filter is the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal, or The indication information is used to instruct the first terminal to transmit the sideline data using a first spatial domain transmission filter, wherein the first spatial domain transmission filter is the target spatial domain transmission filter used by the first terminal to transmit the first sideline reference signal, or The indication information is used to instruct the second terminal to receive the sideline data using first spatial domain reception parameters, wherein the first spatial domain reception parameters are the same as the target spatial domain reception parameters used by the second terminal to receive the first sideline reference signal, or The indication information is used to instruct the first terminal to send the side data using the first spatial domain transmission parameters, wherein the first spatial domain transmission parameters are the same as the target spatial domain transmission parameters used by the first terminal to send the first side reference signal. There is a third time interval between the transmission time of the indication information and the transmission time of the side data.

15. The method as described in claim 14, characterized in that, The reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is QCL type D.

16. The method as described in claim 14, characterized in that, The indication information is carried in the Sideline Control Information (SCI), Media Access Control Unit (MAC CE), or PC5-Radio Resource Control (PC5-RRC) signaling.

17. The method as described in claim 14, characterized in that, The indication information is the identifier of the first TCI state in the first TCI state set.

18. The method as described in claim 14, characterized in that, The first configuration information includes the total number of TCI states in the first TCI state set.

19. The method as described in claim 14, characterized in that, The first configuration information also includes the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

20. The method as described in claim 14, characterized in that, The TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

21. The method as described in claim 14, characterized in that, The first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

22. The method as described in claim 14, characterized in that, The first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MACCE (Media Access Control Unit), or... The first configuration information is carried in MAC CE, and the indication information is carried in SCI.

23. The method as described in claim 14, characterized in that, The first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

24. The method as described in claim 23, characterized in that, The first value of a bit in the bit diagram indicates that the TCI state corresponding to the bit belongs to the first TCI state set. The second value of a bit in the bit diagram indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value is different from the second value.

25. The method as described in claim 14, characterized in that, The second threshold or the second time interval is configured in one or more of the following ways: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

26. The method as described in claim 14, characterized in that, The second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

27. A first terminal, characterized in that, include: The sending unit is used to send second configuration information to the second terminal, wherein the second configuration information is used to configure a second TCI state set; The sending unit is configured to send first configuration information to the second terminal. The first configuration information is used to configure a first TCI state set, wherein the first TCI state set is a subset of the second TCI state set, and a second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval. A generation unit is used to generate indication information, which is generated based on the measurement results fed back by the second terminal; The sending unit is configured to send the indication information to the second terminal, wherein the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than a first time domain resource, wherein the first time domain resource is determined based on the time domain resources occupied by the first configuration information and the first time interval. The indication information is used to indicate a first transmission configuration indicating a TCI state, wherein the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state from the first TCI state set, or... The indication information is used to instruct the second terminal to use a first spatial domain receiving filter to receive sideline data. The first spatial domain receiving filter is the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal. The indication information is used to instruct the first terminal to transmit sideline data using a first spatial domain transmission filter. The first spatial domain transmission filter is the target spatial domain transmission filter used by the first terminal to transmit the first sideline reference signal. The indication information is used to instruct the second terminal to receive sideline data using first spatial domain reception parameters. The first spatial domain reception parameters are the same as the target spatial domain reception parameters used by the second terminal to receive the first sideline reference signal. The indication information is used to instruct the first terminal to send side data using the first spatial domain transmission parameters, wherein the first spatial domain transmission parameters are the same as the target spatial domain transmission parameters used by the first terminal to send the first side reference signal. There is a third time interval between the transmission time of the indication information and the transmission time of the side data.

28. The first terminal as described in claim 27, characterized in that, The reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is QCL type D.

29. The first terminal as described in claim 27, characterized in that, The indication information is carried in the Sideline Control Information (SCI), Media Access Control Unit (MAC CE), or PC5-Radio Resource Control (PC5-RRC) signaling.

30. The first terminal as described in claim 27, characterized in that, The indication information is the identifier of the first TCI state in the first TCI state set.

31. The first terminal as described in claim 27, characterized in that, The first configuration information includes the total number of TCI states in the first TCI state set.

32. The first terminal as described in claim 27, characterized in that, The first configuration information also includes the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

33. The first terminal as described in claim 27, characterized in that, The TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

34. The first terminal as described in claim 27, characterized in that, The first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

35. The first terminal as described in claim 27, characterized in that, The first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE, or The first configuration information is carried in MAC CE, and the indication information is carried in SCI.

36. The first terminal as described in claim 27, characterized in that, The first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

37. The first terminal as described in claim 36, characterized in that, The first value of a bit in the bit diagram indicates that the TCI state corresponding to the bit belongs to the first TCI state set. The second value of a bit in the bit diagram indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value is different from the second value.

38. The first terminal as described in claim 27, characterized in that, The second threshold or the second time interval is configured in one or more of the following ways: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

39. The first terminal as described in claim 27, characterized in that, The second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

40. A second terminal, characterized in that, include: A receiving unit is configured to receive second configuration information sent by a first terminal, wherein the second configuration information is used to configure a second TCI state set. The receiving unit is configured to receive first configuration information sent by the first terminal, the first configuration information being used to configure a first TCI state set, wherein the first TCI state set is a subset of the second TCI state set, and a second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or the time domain resources of the first configuration information are not earlier than the second time domain resources, wherein the second time domain resources are determined based on the time domain resources of the second configuration information and the second time interval; The receiving unit is used to receive indication information sent by the first terminal, the indication information being generated based on the measurement results fed back by the second terminal; The receiving unit is configured to receive side data sent by the first terminal based on the indication information, wherein the first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or, the time domain resources occupied by the indication information are not earlier than a first time domain resource, wherein the first time domain resource is determined based on the time domain resources occupied by the first configuration information and the first time interval. The indication information is used to indicate a first transmission configuration indication TCI state, wherein the first TCI state belongs to a first TCI state set, and the indication information indicates that the second terminal uses the first TCI state in the first TCI state set, or The indication information is used to instruct the second terminal to receive the sideline data using a first spatial domain receiving filter, wherein the first spatial domain receiving filter is the target spatial domain receiving filter used by the second terminal to receive the first sideline reference signal, or The indication information is used to instruct the first terminal to transmit the sideline data using a first spatial domain transmission filter, wherein the first spatial domain transmission filter is the target spatial domain transmission filter used by the first terminal to transmit the first sideline reference signal, or The indication information is used to instruct the second terminal to receive the sideline data using first spatial domain reception parameters, wherein the first spatial domain reception parameters are the same as the target spatial domain reception parameters used by the second terminal to receive the first sideline reference signal, or The indication information is used to instruct the first terminal to send the side data using the first spatial domain transmission parameters, wherein the first spatial domain transmission parameters are the same as the target spatial domain transmission parameters used by the first terminal to send the first side reference signal. There is a third time interval between the transmission time of the indication information and the transmission time of the side data.

41. The second terminal as described in claim 40, characterized in that, The reference signal included in the first TCI state is the first side-row reference signal, and / or the quasi-co-address QCL type included in the first TCI state is QCL type D.

42. The second terminal as described in claim 40, characterized in that, The indication information is carried in the Sideline Control Information (SCI), Media Access Control Unit (MAC CE), or PC5-Radio Resource Control (PC5-RRC) signaling.

43. The second terminal as described in claim 40, characterized in that, The indication information is the identifier of the first TCI state in the first TCI state set.

44. The second terminal as described in claim 40, characterized in that, The first configuration information includes the total number of TCI states in the first TCI state set.

45. The second terminal as described in claim 40, characterized in that, The first configuration information also includes the identifier of the sidecar associated with the first TCI state set, and / or the identifier of the sideband portion (BWP) associated with the first TCI state set.

46. ​​The second terminal as described in claim 40, characterized in that, The TCI states in the first TCI state set include at least one of the following: an identifier of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

47. The second terminal as described in claim 40, characterized in that, The first threshold or the first time interval is configured in one or more of the following ways: pre-configured, pre-defined, network configured, indicated by the first terminal, or indicated by the second terminal.

48. The second terminal as described in claim 40, characterized in that, The first configuration information is carried in PC5-RRC signaling, and the indication information is carried in SCI or MAC CE, or The first configuration information is carried in MAC CE, and the indication information is carried in SCI.

49. The second terminal as described in claim 40, characterized in that, The first configuration information includes a bitmap, the length of which is determined based on the total number of TCI states in the second TCI state set.

50. The second terminal as described in claim 49, characterized in that, The first value of a bit in the bit diagram indicates that the TCI state corresponding to the bit belongs to the first TCI state set. The second value of a bit in the bit diagram indicates that the TCI state corresponding to the bit does not belong to the first TCI state set, and the first value is different from the second value.

51. The second terminal as described in claim 40, characterized in that, The second threshold or the second time interval is configured in one or more of the following ways: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

52. The second terminal as described in claim 40, characterized in that, The second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

53. A terminal, characterized in that, It includes a memory and a processor, the memory being used to store a program, and the processor being used to invoke the program in the memory to perform the method as described in any one of claims 1-26.

54. An apparatus, characterized in that, Includes a processor for calling a program from memory to perform the method as described in any one of claims 1-26.

55. A chip, characterized in that, Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1-26.

56. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-26.

57. A computer program product, characterized in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-26.

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