Lateral communication method and terminal equipment

Abstract

Provided are a method and a terminal device for sidewalk communication, the method comprising: a first terminal device determining a first channel state information reference signal (CSI-RS) resource in a first time unit, the first time unit satisfying one of the following: the first time unit comprises a plurality of continuous time slots; the first time unit comprises a time slot, and the first CSI-RS resource is a transmission resource reserved by a terminal device for sending the CSI-RS, so that the transmission efficiency of the CSI-RS is improved.

Description

Method and terminal equipment for sideline communication Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method and terminal device for sideline communication. Background Art

[0002] In conventional communication systems, a time slot can only contain one channel state information reference signal (CSI-RS) resource. When a terminal transmitting a CSI-RS needs to transmit multiple CSI-RSs, multiple CSI-RSs can only be transmitted separately across multiple time slots, resulting in low CSI-RS transmission efficiency.

[0003] Summary of the Invention

[0004] The present application provides a method and terminal device for sideline communication. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for sideline communication is provided, including: a first terminal device determines a first channel state information reference signal CSI-RS resource in a first time unit, wherein the first time unit satisfies one of the following: the first time unit includes a plurality of consecutive time slots; the first time unit includes one time slot, and the first CSI-RS resource is a transmission resource reserved for the terminal device for sending the CSI-RS.

[0006] According to a second aspect, a terminal device is provided, which is a first terminal device, and includes: a processing unit for determining a first channel state information reference signal CSI-RS resource in a first time unit, wherein the first time unit satisfies one of the following: the first time unit includes a plurality of consecutive time slots; the first time unit includes one time slot, and the first CSI-RS resource is a transmission resource reserved for the terminal device for sending the CSI-RS.

[0007] In a third aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0008] In a fourth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0009] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device or a network device) to execute some or all of the steps in the methods of the above aspects.

[0010] In a sixth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0011] In the seventh aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0012] In an embodiment of the present application, a plurality of consecutive time slots may be referred to as a first time unit. Accordingly, the first terminal device may determine a first CSI-RS resource in the first time unit. Compared with a scheme in which the terminal device determines the CSI-RS resource in a single time slot, the number of resources that can be used to transmit the CSI-RS included in the first time unit may be larger, which helps to improve the transmission efficiency of the CSI-RS. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0014] FIG2 is an example diagram of a side communication scenario within network coverage.

[0015] FIG3 is an example diagram of a side communication scenario with partial network coverage.

[0016] FIG4 is an example diagram of a side communication scenario outside network coverage.

[0017] FIG5 is a diagram showing an example of a side communication scenario based on a central control node.

[0018] FIG6 is an example diagram of a sideline communication method based on broadcasting.

[0019] FIG7 is an example diagram of a unicast-based sideline communication method.

[0020] FIG8 is an example diagram of a side communication method based on multicast.

[0021] FIG. 9A is a diagram illustrating an example of a time slot structure used by a sideline communication system.

[0022] FIG. 9B is another diagram illustrating an example of a time slot structure used by the sideline communication system.

[0023] FIG10 is a schematic diagram showing time-frequency resources occupied by SL CSI-RS.

[0024] FIG11 is a schematic diagram of a beam-based communication scenario.

[0025] FIG12 is a schematic diagram of another beam-based communication scenario.

[0026] FIG13 is a schematic diagram of a TCI status indication method available for a downlink data channel.

[0027] 14A to 14C are schematic diagrams of a resource selection window and a resource listening window.

[0028] FIG15 is a schematic diagram of CSI-RS resources included in a time slot in an embodiment of the present application.

[0029] FIG16 is a schematic flowchart of a method for sideline communication according to an embodiment of the present application.

[0030] 17A to 17E are schematic diagrams of a first time unit in an embodiment of the present application.

[0031] Figure 18 is a schematic diagram of a terminal device according to an embodiment of the present application.

[0032] FIG19 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] Communication system architecture

[0034] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0035] FIG1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For a network device 110, the one or more terminal devices 120 may all be located within the network coverage of the network device 110, or all be located outside the network coverage of the network device 110, or some may be located within the coverage of the network device 110 and others outside the network coverage of the network device 110. This is not limited in the embodiments of the present application.

[0036] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0037] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0038] The terminal device in the embodiment of the present application may 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 device, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may 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 a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. For example, a terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cell phone and a car can communicate with each other using sidelink signals. A cell phone and a smart home device can also communicate without relaying the communication signal through a base station. Alternatively, the terminal device can be used to act as a base station.

[0039] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard 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 may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned device or apparatus. A base station may also be a mobile switching center and a device that performs base station functions in device-to-device D2D, V2X, or machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by network devices.

[0040] 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 based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0041] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0042] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0043] Sideline communication under different network coverage conditions

[0044] Sidelink communication refers to a communication technology based on a sidelink. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In traditional cellular systems, communication data is received or sent between terminal devices and network devices, while sidelink communication supports direct communication and data transmission between terminal devices. Compared with traditional cellular communication, direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission latency. For example, the vehicle networking system adopts sidelink communication technology.

[0045] In side communication, according to the network coverage of the terminal device, the side communication can be divided into side communication within the network coverage, side communication with partial network coverage, and side communication outside the network coverage.

[0046] Figure 2 illustrates an example scenario for sidelink communication within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage of network device 110. Therefore, both terminal devices 120a can receive configuration signaling from network device 110 (configuration signaling in this application can also be replaced by configuration information) and determine the sidelink configuration based on the configuration signaling from network device 110. After both terminal devices 120a have configured their sidelinks, sidelink communication can proceed on the sidelink.

[0047] Figure 3 is an example diagram of a sidelink communication scenario with partial network coverage. In the scenario shown in Figure 3, terminal device 120a performs sidelink communication with terminal device 120b. Terminal device 120a is located within the coverage range of network device 110, so terminal device 120a can receive the configuration signaling of network device 110 and determine the sidelink configuration based on the configuration signaling of network device 110. Terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of network device 110. In this case, terminal device 120b can determine the sidelink configuration based on pre-configuration information and / or information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a within the network coverage. After both terminal device 120a and terminal device 120b perform sidelink configuration, sidelink communication can be performed on the sidelink.

[0048] Figure 4 illustrates an example scenario for sidelink communication outside of network coverage. In the scenario shown in Figure 4, both terminal devices 120b are outside of network coverage. In this scenario, both terminal devices 120b can determine the sidelink configuration based on pre-configured information. After both terminal devices 120b have configured their sidelinks, sidelink communication can proceed over the sidelink.

[0049] Sideline communication based on central control node

[0050] Figure 5 is an example diagram of a sideline communication scenario based on a central control node. In this sideline communication scenario, multiple terminal devices can form a communication group, and the communication group has a central control node. The central control node can be a terminal device in the communication group (such as terminal device 1 in Figure 5), and the terminal device can also be called a cluster head (CH) terminal device. The central control node can be responsible for completing one or more of the following functions: establishing a communication group, joining and leaving group members of the communication group, coordinating resources within the communication group, allocating sideline transmission resources to other terminal devices, receiving sideline feedback information from other terminal devices, and coordinating resources with other communication groups.

[0051] Sideline communication mode

[0052] Some standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two sideline communication modes: a first mode and a second mode.

[0053] In the first mode, the resources of the terminal device (the resources mentioned in this application may also be referred to as transmission resources, such as time-frequency resources) are allocated by the network device. The terminal device can send data on the side link according to the resources allocated by the network device. The network device can allocate resources for a single transmission to the terminal device, or it can allocate resources for semi-static transmission to the terminal device. This first mode can be applied to scenarios covered by a network device, such as the scenario shown in Figure 2 above. In the scenario shown in Figure 2, the terminal device 120a is within the network coverage of the network device 110, so the network device 110 can allocate resources used in the side transmission process to the terminal device 120a.

[0054] In the second mode, the terminal device can autonomously select one or more resources from a resource pool (RP). The terminal device can then perform side transmission based on the selected resources. For example, in the scenario shown in FIG4 , the terminal device 120b is located outside the cell coverage area. Therefore, the terminal device 120b can autonomously select resources from a pre-configured resource pool for side transmission. Alternatively, in the scenario shown in FIG2 , the terminal device 120a can also autonomously select one or more resources from a resource pool configured by the network device 110 for side transmission.

[0055] Data transmission method of side communication

[0056] Some sidewalk communication systems (such as long-term evolution vehicle to everything (LTE-V2X)) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device around terminal device 1, for example, terminal devices 2 to terminal devices 6 in Figure 6.

[0057] In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and / or multicast-based data transmission (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) hopes to support autonomous driving. Autonomous driving places higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and multicast transmission.

[0058] For unicast transmission, there is typically only one receiving terminal. For example, in Figure 7, unicast transmission occurs between terminal devices 1 and 2. Terminal device 1 can be the sender and terminal device 2 can be the receiver, or vice versa.

[0059] For multicast transmission, the receiving terminal can be a terminal device within a communication group, or a terminal device within a certain transmission distance. For example, in Figure 8, terminal devices 1, 2, 3, and 4 form a communication group. If terminal device 1 sends data, all other terminal devices in the group (terminal devices 2 through 4) can be receiving terminals.

[0060] Time slot structure for sideline communication

[0061] A communication system may define a frame, subframe, or time slot structure for sidelink communication. Some sidelink communication systems define multiple time slot structures. For example, the NR-based sidelink communication system (NR SL) defines two time slot structures. One of the two time slot structures does not include a physical sidelink feedback channel (PSFCH), see Figure 9A ; the other of the two time slot structures includes a PSFCH, see Figure 9B .

[0062] The PSCCH in the NR SL can start at the second sidelink symbol of the timeslot in the time domain, and the PSCCH can occupy 2 or 3 symbols in the time domain (the symbols mentioned here can all refer to orthogonal frequency division multiplexing (OFDM) symbols). The PSCCH can occupy multiple physical resource blocks (PRBs) in the frequency domain. For example, the number of PRBs occupied by the PSCCH can be selected from the following values: {10, 12 15, 20, 25}.

[0063] To reduce the complexity of blind detection of PSCCH by terminal devices, typically, only one number of symbols and PRBs is configured for PSCCH within a resource pool. Furthermore, since NR SL uses sub-channels as the minimum granularity for PSSCH resource allocation, the number of PRBs occupied by PSCCH must be less than or equal to the number of PRBs contained in a sub-channel within the resource pool.

[0064] Referring to Figure 9A, for a time slot structure that does not include PSFCH, the PSSCH in the NR SL can use the second side symbol of the time slot as the starting position in the time domain. The last side symbol in the time slot is used as a guard period (GP), and the remaining symbols can be mapped to PSSCH, where the guard interval can also be called a guard symbol. The first side symbol in the time slot can be a repetition of the second side symbol. Generally speaking, the terminal device at the receiving end will use the first side symbol as a symbol for automatic gain control (AGC). Therefore, the data on the first side symbol is usually not used for data demodulation. PSSCH can occupy K subchannels in the frequency domain, and each subchannel can include M consecutive PRBs (the values ​​of K and M can be predefined by protocol, or preconfigured, or configured by network equipment, or depend on the implementation of the terminal device).

[0065] FIG9 B shows a time slot structure including PSFCH, and FIG9 B schematically illustrates the positions of the symbols occupied by PSFCH, PSCCH, and PSSCH in a time slot. The main difference between this time slot structure and FIG9 A is that the penultimate symbol and the penultimate symbol in the time slot are used to transmit PSFCH. In addition, a symbol before the symbol used to transmit PSFCH is also used as a GP (or guard symbol). As can be seen from the time slot structure shown in FIG9 B, in a time slot, the last symbol is used as a GP, the penultimate symbol is used for PSFCH transmission, the data on the penultimate symbol is the same as the data of the penultimate symbol used for PSFCH transmission, that is, the penultimate symbol serves as the symbol for AGC, and the penultimate symbol has the same function as the last symbol and is also used as a GP. In addition, the first symbol in the time slot is used as AGC, the data on this symbol is the same as the data on the second symbol in the time slot, PSCCH occupies 3 symbols, and the remaining symbols can be used for PSSCH transmission.

[0066] Channel State Information Reference Signal

[0067] To better support unicast communications, the NR SL system supports CSI-RS (also known as "sidelink channel state information reference signal (SL CSI-RS)"). The NR SL system stipulates that SL CSI-RS will only be sent when the following three conditions are met.

[0068] Condition 1: The terminal device needs to send the PSSCH corresponding to the SL CSI-RS, that is, the terminal device cannot only send the SL CSI-RS.

[0069] Condition 2: Sidelink channel state information (CSI) reporting is activated through high-layer signaling.

[0070] Condition 3: When high-layer signaling activates sidelink CSI reporting, the corresponding bit in the second-order sidelink control information (SCI) (also known as "second-order SCI") sent by the terminal device triggers sidelink CSI reporting.

[0071] The maximum number of ports supported by SL CSI-RS is 2. When there are two ports, SL CSI-RSs from different ports are multiplexed using code division on two adjacent resource elements (REs) in the same sidelink symbol. The number of SL CSI-RSs per port within a PRB is 1, that is, the density is 1. Therefore, within a PRB, an SL CSI-RS can appear on at most one sidelink symbol, and the specific location of this sidelink symbol is determined by the terminal device transmitting the SL CSI-RS.

[0072] Generally, in order to avoid affecting the resource mapping of PSCCH and second-order SCI, SL CSI-RS cannot be located in the same sidebar symbol as PSCCH and second-order SCI.

[0073] In addition, since the channel estimation accuracy of the sidelink symbol where the PSSCH demodulation reference signal (DMRS) is located is higher and the SL CSI-RS of the two ports will need to occupy two consecutive REs in the frequency domain, the SL CSI-RS and the PSSCH DMRS cannot be sent in the same sidelink symbol.

[0074] In some cases, the position of the side symbol occupied by the SL CSI-RS can be indicated by the sl-CSI-RS-FirstSymbol parameter in the PC5 radio resource control (RRC). In addition, the position of the first resource element (RE) occupied by the SL CSI-RS in a PRB is indicated by the "sl-CSI-RS-FreqAllocation" parameter in the PC5RRC. If the SL CSI-RS corresponds to one port, the parameter is a bitmap with a length of 12, corresponding to 12 REs in one PRB. If the SL CSI-RS corresponds to two ports, the parameter is a bitmap with a length of 6. In this case, the 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 above bitmap.

[0075] The frequency domain position occupied by the SL CSI-RS is also determined by the terminal device that sends the SL CSI-RS, and it should be noted that the determined frequency domain position of the SL CSI-RS cannot conflict with the frequency domain position occupied by the PT-RS.

[0076] Figure 10 shows a schematic diagram of the time-frequency resources occupied by the SL CSI-RS. Assume in Figure 10 that the number of ports corresponding to the SL CSI-RS is 2, sl-CSI-RS-FirstSymbol indicates that the SL CSI-RS occupies side symbol position 8, and sl-CSI-RS-FreqAllocation indicates that the position of the first RE occupied by the SL CSI-RS within a PRB is [b5, b4, b3, b2, b1, b0] = [0, 0, 0, 1, 0, 0].

[0077] Multi-beam system

[0078] Communication systems (e.g., NR) are designed to provide wide-bandwidth communications in high-frequency bands (e.g., bands above 6 GHz). As the operating frequency increases, path loss during transmission increases, impacting the coverage capabilities of high-frequency systems. Therefore, to effectively ensure high-frequency coverage, an effective technical solution is to use massive multiple-in-multiple-out (MIMO) antenna arrays to form shaped beams with greater gain, overcome propagation loss, and ensure the coverage of the communication system.

[0079] Currently, the most common large-scale antenna array is the millimeter-wave antenna array. Since the wavelength emitted by the millimeter-wave antenna array is shorter, the spacing between antenna elements of the antenna array can be shorter and the aperture of the antenna array can be smaller, so that more physical antenna elements can be integrated into a two-dimensional antenna array of limited size.

[0080] In addition, due to the limited size of the millimeter-wave antenna array, digital beamforming cannot be used due to factors such as hardware complexity, cost overhead, and power consumption. Instead, analog beamforming is usually used. While enhancing network coverage, it can also reduce the complexity of device implementation.

[0081] To facilitate understanding of the multi-beam system, the following text introduces the communication process based on beam communication by taking the scenario of communication between a network device and a terminal as an example with reference to Figures 11 and 12.

[0082] Referring to FIG. 11 , in conventional communication systems (e.g., 2G, 3G, or 4G systems), a relatively wide beam 1010 is typically used to cover an entire cell (or "sector"). Thus, at each instant in time, terminals within the cell (e.g., terminal devices 1-5) can communicate with network devices via this relatively wide beam, for example, to obtain transmission resources allocated by the network devices.

[0083] Referring to Figure 12, in newer communication systems (e.g., 5G systems or NR systems), a multi-beam system 1110 can be used to cover the entire cell. That is, each beam in the multi-beam system (e.g., beams 1111 to 1114) covers a smaller range in the cell, and beam sweeping is used to achieve the effect of multiple beams covering the entire cell.

[0084] During beam scanning, different beams are used at different times to cover different areas in the cell. For example, at time 1, the communication system can use beam 1111 to cover the area where terminal device 1 is located. At time 2, the communication system can use beam 1112 to cover the area where terminal device 2 is located. At time 3, the communication system can use beam 1113 to cover the areas where terminal devices 3 and 4 are located. At time 4, the communication system can use beam 1114 to cover the area where terminal 5 is located.

[0085] Multi-beam systems use narrower beams, allowing for more concentrated transmission energy and thus greater coverage. However, precisely because the beams are narrow, each beam can only cover a portion of a cell. Therefore, multi-beam systems can be understood as "trading time for space."

[0086] Analog beamforming can be used not only in network equipment but also in terminal devices. Furthermore, analog beamforming can be used not only for signal transmission (called transmit beamforming) but also for signal reception (called receive beamforming).

[0087] Currently, different beams are identified by different signals associated with (or carried within) the beams. For example, different beams transmit different synchronization signals and PBCH blocks (SSBs), and terminal devices can distinguish different beams based on the different SSBs. Another example is that different beams transmit different CSI-RSs, and terminal devices can identify different beams based on the CSI-RS signals and / or CSI-RS resources.

[0088] In a multi-beam system, PDCCH and PDSCH can be transmitted through different downlink transmit beams.

[0089] For some communication systems (such as those with carrier frequencies below 6 GHz), terminal devices generally do not use analog beamforming. In such systems, terminal devices can use omnidirectional (or nearly omnidirectional) antennas to receive signals transmitted by different downlink transmit beams from network devices.

[0090] For some communication systems (such as millimeter wave systems), terminal devices may use analog beams. In such communication systems, terminal devices can use downlink receive beams to receive signals sent by corresponding downlink transmit beams. In this case, beam indication information can be used to assist the terminal device in determining one or more of the following: information about the network device's transmit beam and information about the terminal device's corresponding receive beam.

[0091] In some communication systems (such as NR-related protocols), beam indication information does not directly indicate the beam itself, but rather indicates it through quasi co-location (QCL) between signals. On the terminal side, determining the corresponding channel / signal for reception is also based on the QCL assumption.

[0092] Downlink QCL indication / assumption

[0093] When receiving signals, terminal devices can improve reception performance by utilizing the characteristics of the transmission environment corresponding to data transmission to improve the reception algorithm. For example, terminal devices can optimize the design and parameters of the channel estimator using the statistical characteristics of the channel. In some communication systems (such as NR systems), the characteristics of the transmission environment corresponding to data transmission can be represented by QCL information (QCL-Info).

[0094] When downlink data transmission is performed using different transmission and receiving points (TRPs) / panels / beams, the characteristics of the transmission environment corresponding to the data transmission may also change. Therefore, in some communication systems (such as NR systems), when a downlink control channel or downlink data channel needs to be transmitted, the network equipment can indicate the corresponding QCL information to the terminal device through the transmission configuration indicator (TCI) status.

[0095] A TCI state may include the following configuration information: TCI state identity (ID), QCL information 1, and QCL information 2 (optional). The TCI state ID may be used to identify a TCI state.

[0096] The QCL information may include the following information: QCL type configuration and QCL reference signal configuration. The QCL type configuration may be one of QCL-Type A, QCL-Type B, QCL-Type C, or QCL-Type D. The QCL reference signal configuration may include the cell identifier (cell ID) where the reference signal resides, the bandwidth part (BWP), and the reference signal identifier (e.g., CSI-RS resource identifier or SSB index).

[0097] If QCL information 1 and QCL information 2 are configured at the same time, the QCL type of at least one of the QCL information 1 and QCL information 2 must be one of QCL-TypeA, QCL-TypeB, and QCL-TypeC, and the QCL type of the other QCL information must be QCL-Type D.

[0098] The definitions of different QCL type configurations are as follows.

[0099] QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread}

[0100] QCL Type B (QCL-TypeB): {Doppler shift, Doppler spread}

[0101] QCL Type C (QCL-TypeC): {Doppler shift, average delay}

[0102] QCL Type D (QCL-TypeD): {spatial reception parameters}.

[0103] In the NR system, the network device can indicate the corresponding TCI state for the downlink signal or downlink channel. If the network device configures the QCL reference signal of the target downlink channel or target downlink signal as SSB or CSI-RS through the TCI state, and the QCL type is configured as QCL-TypeA, QCL-TypeB or QCL-TypeC, the terminal device can assume that the large-scale parameters of the target downlink signal and the SSB or CSI-RS are the same. As for the specific content of the large-scale parameters, it can be determined based on the QCL type configuration.

[0104] Similarly, if the network device configures the QCL reference signal of the target downlink channel or downlink signal to SSB or CSI-RS through the TCI state, and the QCL type is configured as QCL-TypeD, the terminal device can use the same receiving beam as that for receiving the SSB or CSI-RS (i.e., the same spatial receiving parameters (spatial Rx parameter)) to receive the target downlink signal. Generally speaking, on the network device side, the target downlink channel (or target downlink signal) and the SSB or CSI-RS to which it refers are sent by the same TRP / panel / beam. If the TRP / panel / beam used to transmit two downlink signals (or downlink channels) is different, different TCI states are usually configured for the two downlink signals (or downlink channels).

[0105] For a downlink control channel, the TCI state of the CORESET corresponding to the downlink control channel may be indicated by RRC signaling or RRC signaling combined with media access control (MAC) signaling.

[0106] For the downlink data channel (i.e., PDSCH), see Figure 13. The TCI state set available for the downlink data channel can be indicated by RRC signaling, and some of the TCI states can be activated by MAC layer signaling. Finally, one or two TCI states are indicated from the activated TCI states through the TCI state indication field in the DCI for the downlink data channel scheduled by the DCI.

[0107] To improve the transmission rate of the sidewalk system, it is possible to consider adopting a beam-based transmission method in the sidewalk system. For example, the sidewalk system can be expanded to the millimeter wave frequency band and then analog beamforming can be used for sidewalk transmission to enhance the transmission rate and network coverage of the sidewalk system.

[0108] In some scenarios (for example, NR downlink communication system), the DCI carries TCI status indication information, which is used to indicate the beam information used for the PDSCH scheduled by the DCI, or for the terminal to determine the receiving beam used to receive the PDSCH scheduled by the DCI. The time interval between the DCI and the PDSCH needs to be greater than the first threshold, mainly because the terminal receives the DCI and obtains the indication information to determine the receiving beam, and uses the receiving beam to receive the PDSCH, which requires corresponding processing time. Therefore, the first threshold value is associated with the processing time of the terminal. In some implementations, the value of the first threshold value can be, for example, the duration corresponding to 7, 14, or 28 time domain symbols.

[0109] If the sideline system adopts a beam-based transmission method, the terminal that sends CSI-RS can perform sideline transmission based on the transmission beam; and / or, the terminal that receives CSI-RS can perform sideline reception based on the reception beam. In some cases, the above-mentioned transmission beam can also be called a spatial domain transmission filter, a transmitting end spatial transmission filter, a spatial transmission filter for transmission, or other names, and accordingly, the above-mentioned reception beam can also be called a spatial domain reception filter, a receiving end spatial transmission filter, a spatial transmission filter for reception, or other names. In other cases, the above-mentioned transmission beam can also be called a spatial domain transmission parameter, and accordingly, the above-mentioned reception beam can also be called a spatial domain reception parameter. For ease of understanding, the embodiments of the present application are mainly introduced with the transmission beam / reception beam as an example. The transmission beam and the spatial transmission filter or the spatial transmission parameter can be used interchangeably, and the reception beam and the spatial reception filter or the spatial reception parameter can be used interchangeably.

[0110] Resource pre-emption mechanism and resource re-evaluation mechanism

[0111] Some communication protocols (for example, LTE SL) stipulate that after a terminal device selects a transmission resource, it will send data on this resource. However, it is possible that two terminals may select the same transmission resource, which may cause a resource conflict and reduce system performance. To solve this problem, NR SL introduces a resource preemption mechanism and a resource reassessment mechanism. This allows a terminal to determine whether there is a resource conflict with other terminals before using the selected resource. If there is no conflict, the terminal can continue to use the selected transmission resource. If there is a resource conflict, it needs to avoid the resource conflict according to the corresponding mechanism and reselect the resource.

[0112] Currently, NR SL supports a resource reassessment mechanism. After a terminal completes resource selection, resources that have been selected but not indicated by sending sideline control information may still be reserved by other terminals with bursty non-periodic services, resulting in resource collisions. To address this issue, a resource reassessment mechanism is proposed. This mechanism requires the terminal to continue listening to sideline control information after completing resource selection and reassess selected but unindicated resources at least once. In addition, a resource preemption mechanism is proposed for resources that have already been selected and indicated by sending sideline control information.

[0113] The resource re-evaluation mechanism is described below in conjunction with Figures 14A and 14B. As shown in Figure 14A, the terminal selects resources in time slot n and determines the candidate resource set S in the selection window based on the listening result. A , the terminal is at S A Resources w, x, and y are selected in time slot m. Resource w is located in time slot m. For a resource, if the SCI does not indicate that the resource is reserved, a re-evaluation test is required before using the resource. In this example, w is the first resource selected by the terminal and is not indicated by the SCI to be reserved. Therefore, the terminal needs to perform a re-evaluation test before using resource w for data transmission. Therefore, the UE performs a resource listening in time slot m-T3, that is, determines the resource selection window and the listening window, and excludes the resources in the resource selection window to obtain the candidate resource set S′ A , as shown in Figure 14B.

[0114] If resource w is not in the candidate resource set S′ A In the example, it indicates that resource w conflicts with resources reserved by other users and is removed from the candidate resource set S′. A Therefore, the terminal needs to be excluded from the candidate resource set S′ AA new resource is selected to replace the originally selected resource w. This process is called re-evaluation. It should be understood that when re-evaluation is performed in time slot m-T3, since the pre-selected resources x and y are not reserved by the SCI indication, re-evaluation can also be performed on resources x and y simultaneously. The detection process is the same as that for resource w.

[0115] Currently, NR SL supports the Pre-emption mechanism, which is a resource preemption mechanism. A After completing resource selection, the terminal still continues to monitor the side control information. If the time-frequency resources that have been selected and indicated by sending the side control information meet the following three conditions, resource reselection is triggered.

[0116] Condition 1: The reserved resources in the detected sidelink control information overlap with the resources selected and indicated by the terminal. Resource overlap includes full overlap and partial overlap.

[0117] Condition 2: The RSRP of the PSCCH corresponding to the sidelink control information detected by the terminal or the RSRP of the PSSCH scheduled by the PSCCH is greater than the SL RSRP threshold.

[0118] Condition 3: The priority carried in the detected sidelink control information is higher than the priority of the data to be sent by the terminal.

[0119] The resource preemption mechanism is described below in conjunction with Figures 14A and 14C. Referring to Figure 14A, the terminal selects resources in time slot n and determines the candidate resource set S in the selection window based on the listening result. A , the terminal is at S A Resources w, x, and y are selected. Resource w is in time slot m and resource x is in time slot k. Referring to Figure 14C, the SCI sent by the terminal in resource w has indicated that resource x is reserved. Therefore, the terminal needs to perform a pre-emption check before using resource x. The terminal performs a resource listening in time slot k-T3 and determines the candidate resource set S′ A If resource x is not in the candidate resource set S′ A In the process, it is further determined whether the resource x is not in the candidate resource set S′ due to the indication of the high-priority side control information. A If the above conditions 1 to 3 are met, the terminal performs resource reselection and selects the candidate resource set S′. A Reselect the resource to replace the originally selected resource x.

[0120] Currently, in known communication systems (e.g., NR SL), as shown in Figure 10, only one CSI-RS resource can be included in a time slot. When the terminal sending CSI-RS needs to send multiple CSI-RSs, multiple CSI-RSs can only be transmitted separately through multiple time slots, resulting in low CSI-RS transmission efficiency.

[0121] For example, during beam selection, a terminal transmitting CSI-RS needs to use multiple CSI-RS resources to transmit CSI-RS corresponding to different beams in the multiple beams, so that a terminal receiving CSI-RS can select a target beam from the corresponding multiple beams based on the multiple CSI-RS. At this point, if the CSI-RS transmission mechanism shown in Figure 10 is still used, the terminal transmitting CSI-RS can only transmit the CSI-RS corresponding to the multiple beams separately in multiple time slots, resulting in a higher latency in the beam selection process and lower CSI-RS transmission efficiency.

[0122] Therefore, in response to the above problems, an embodiment of the present application provides a CSI-RS transmission method, in which a time slot can include multiple resources that can be used for CSI-RS transmission (referred to as "CSI-RS resources" for short). In this way, the terminal sending CSI-RS can send multiple CSI-RSs in one time slot, which helps to improve the transmission efficiency of CSI-RS.

[0123] In some implementations, each CSI-RS resource may occupy K time-domain symbols, where K is a positive integer greater than or equal to 1. For example, K=1 or K=2.

[0124] For ease of understanding, the CSI-RS transmission mechanism of an embodiment of the present application is described below in conjunction with Figure 15. Figure 15 is a schematic diagram of the CSI-RS resources included in a time slot in an embodiment of the present application. As shown in Figure 15, a time slot may include 4 resources that can be used to transmit CSI-RS, and each resource that can be used to transmit CSI-RS may include a time domain symbol. Accordingly, the time domain symbols occupied by the 4 resources that can be used to transmit CSI-RS include time domain symbols 9 to time domain symbols 12. At this time, the terminal sending CSI-RS can send 4 CSI-RS in 4 CSI-RS resources.

[0125] In some scenarios, the terminal sending CSI-RS will carry the indication information of the CSI-RS resource in the first-order SCI or the second-order SCI, which is used to indicate the CSI-RS resource of the CSI-RS transmitted simultaneously with the SCI, so that the terminal receiving the CSI-RS can measure and report. Taking the SCI carried on the first-order SCI as an example, the terminal receiving the CSI-RS needs to perform corresponding processing within a period of time after receiving the SCI and before receiving the CSI-RS corresponding to the SCI. For example, the terminal receiving the CSI-RS needs to decode the first-order SCI within this period of time to obtain the indication information of the CSI-RS resource, determine the corresponding receiving beam according to the indication information of the CSI-RS resource, and switch to the receiving beam for subsequent reception of the CSI-RS. In other words, there needs to be a period of time between the resource for transmitting the SCI and the CSI-RS resource.

[0126] In some implementations, the interval between the resources for transmitting SCI and the CSI-RS resources can be determined by a first threshold value. That is to say, the time interval between the resources for transmitting SCI and the CSI-RS resources needs to be greater than or equal to the first threshold value. Continuing to refer to Figure 15, taking the duration corresponding to 7 time domain symbols as an example, if the SCI is carried by PSCCH, the end position of the last time domain symbol of PSCCH is the end position of time domain symbol 3. At this time, the symbols that are greater than or equal to 7 time domain symbols away from time domain symbol 3 are time domain symbols 11 to time domain symbol 13, of which time domain symbol 13 is used as a protection symbol and can be ignored. Then, only the CSI-RS that occupies time domain symbol 11 and time domain symbol 12 for transmission can be successfully received by the receiving end. For the CSI-RS that occupies time domain symbol 9 and time domain symbol 10 for transmission, since its time domain position and the time domain position of PSCCH are less than the first threshold, the receiving end may not have time to receive the CSI-RS, and it is impossible to perform beam training and beam selection based on the CSI-RS.

[0127] Based on the above introduction, it can be seen that even if it is stipulated that multiple CSI-RS resources can be included in a time slot, due to the limitation between the time domain position of the CSI-RS resource indication information and the time domain position of the CSI-RS resource (that is, the time domain position of the CSI-RS resource indication information and the time domain position of the CSI-RS resource is greater than or equal to the first threshold value), the number of resources that can be used to transmit CSI-RS in a time slot is very limited, which limits the efficiency of transmitting CSI-RS. Therefore, to address this problem, the embodiment of the present application also provides a sideline communication method, which is introduced below in conjunction with Example 1.

[0128] Example 1

[0129] In an embodiment of the present application, a plurality of consecutive time slots may be referred to as a first time unit. Accordingly, the first terminal device may determine the first CSI-RS resource in the first time unit (see step S1610 in FIG16 ). Compared with a scheme in which the terminal device determines the CSI-RS resource in a single time slot, the number of CSI-RS resources that can be used for transmission in the first time unit may be larger, which helps to improve the transmission efficiency of the CSI-RS.

[0130] The above-mentioned first terminal device can be a terminal that sends CSI-RS or a terminal that receives CSI-RS, and this embodiment of the present application does not limit this.

[0131] The first time unit may include multiple consecutive time slots. The first time unit may also be understood as a time slot structure based on multiple time slots. In some implementations, the first time unit may be referred to as an aggregate slot, slot aggregation, super slot, slot group, or multiple slot or multi-slot.

[0132] In some implementations, the multiple time slots included in the first time unit may be multiple consecutive physical time slots. In other implementations, the multiple time slots included in the first time unit may be multiple consecutive time slots available for sideline transmission. In other implementations, the multiple time slots included in the first time unit may be multiple consecutive time slots in a resource pool.

[0133] The first CSI-RS resource may be a resource in the first time unit that can be used to transmit a CSI-RS. In the embodiment of the present application, the number of CSI-RS resources included in the first time unit may be one or more. As described above, a CSI-RS resource may include one or more time-domain symbols.

[0134] For ease of understanding, the following describes the first time unit in the embodiment of the present application using a time slot in the first time unit (hereinafter referred to as the "first time slot") as an example. In the embodiment of the present application, the first time slot may include resources that can be used to transmit a CSI-RS (e.g., a first CSI-RS resource), or in other words, the first time slot can be used to transmit a CSI-RS.

[0135] In some implementations, the first time slot may be used only for CSI-RS transmission. "Used only for CSI-RS transmission" may be understood as one or more of the following: Time domain symbols other than AGC symbols in the first time slot may be used for CSI-RS transmission. Symbols other than guard symbols in the first time slot may be used for CSI-RS transmission. Symbols other than AGC and guard symbols in the first time slot may be used for CSI-RS transmission. Symbols from the second time domain symbol available for sideline transmission to the symbol immediately preceding the guard symbol in the first time slot may be used for CSI-RS transmission.

[0136] As shown in FIG17A , the first time unit may include two time slots: time slot n to time slot n+1. Time slot n+1 may be used as an example of a first time slot. In time slot n+1, the second time domain symbol available for sidelink transmission is time domain symbol 1, and the guard symbol is time domain symbol 13. Accordingly, in time slot n+1, the time domain symbol from time domain symbol 1 to the time domain symbol preceding the guard symbol (i.e., time domain symbol 12) may be used to transmit the CSI-RS.

[0137] In some implementations, the first time slot may not be used to transmit the PSCCH. In other words, the resources in the first time slot that can be used to transmit the PSCCH can be used to transmit the CSI-RS. In other words, the first time slot does not include resources for transmitting the PSCCH.

[0138] In an embodiment of the present application, all resources that can be used to transmit PSCCH in the first time slot can be used to transmit CSI-RS. Of course, in an embodiment of the present application, part of the resources that can be used to transmit PSCCH in the first time slot can be used to transmit CSI-RS.

[0139] Continuing with FIG. 17A , time slot n+1 may be used as an example of a first time slot, and time domain symbols that may be used to transmit the PSCCH in time slot n+1 may include time domain symbols 1 to 3. In time slot n+1, the symbols from the second time domain symbol to the symbol before the guard symbol may be used to transmit the CSI-RS, that is, time domain symbols 1 to 3 in time slot n+1 may be used to transmit the CSI-RS.

[0140] In some implementations, the first time slot may not be used to transmit the second-order SCI. In other words, the resources in the first time slot that can be used to transmit the second-order SCI can be used to transmit the CSI-RS. In other words, the first time slot does not include resources for transmitting the second-order SCI.

[0141] In an embodiment of the present application, all resources that can be used to transmit the second-order SCI in the first time slot can be used to transmit CSI-RS. Of course, in an embodiment of the present application, part of the resources that can be used to transmit the second-order SCI in the first time slot can be used to transmit CSI-RS.

[0142] Continuing with FIG. 17A , time slot n+1 may be used as an example of a first time slot, and time domain symbols that may be used to transmit the second-order SCI in time slot n+1 may include time domain symbols 1 to 4. In time slot n+1, the symbols from the second time domain symbol to the symbol before the guard symbol may be used to transmit the CSI-RS. In other words, all time domain symbols that may be used to transmit the second-order SCI in time slot n+1 may be used to transmit the CSI-RS.

[0143] As shown in FIG17B , the first time unit may include two time slots: time slot n to time slot n+1. Time slot n+1 may be used as an example of a first time slot. The time domain symbols that may be used to transmit the second-order SCI in time slot n+1 may include time domain symbols 1 to 4, and the time domain symbols that may be used to transmit the PSCCH in time slot n+1 may include time domain symbols 1 to 3. In time slot n+1, the symbol from the next symbol after the last time domain symbol included in the PSCCH transmission resource (i.e., time domain symbol 4) to the symbol before the guard symbol may be used to transmit the CSI-RS. That is, time domain symbol 4 that may be used to transmit the second-order SCI in time slot n+1 may be used to transmit the CSI-RS, that is, part of the time domain symbols that may be used to transmit the second-order SCI in time slot n+1 may be used to transmit the CSI-RS.

[0144] In some implementations, the first time slot may not be used to transmit the PSSCH. In other words, the resources in the first time slot that can be used to transmit the PSSCH can be used to transmit the CSI-RS.

[0145] Continuing with FIG. 17A , time slot n+1 may be used as an example of a first time slot, and time domain symbols that may be used to transmit the PSSCH in time slot n+1 may include time domain symbols 1 to 12. In time slot n+1, the time domain symbols from the second time domain symbol (i.e., time domain symbol 1) to the symbol before the guard symbol may be used to transmit the CSI-RS. In other words, the time domain symbols that may be used to transmit the PSSCH in time slot n+1 may be used to transmit the CSI-RS.

[0146] The above describes the role of the time domain symbols in the first time slot in the embodiment of the present application. The following describes the time domain location of the resources that can be used to transmit CSI-RS in the first time slot in the embodiment of the present application in combination with Examples 1 to 4. For ease of description, the resources that can be used to transmit CSI-RS in the first time slot are referred to as "first time domain resources" below. In some implementations, some or all of the first CSI-RS resources described above belong to the first time domain resources, or in other words, some or all of the first CSI-RS resources are located in the first time domain resources.

[0147] Example 1: The first time domain resource is determined based on the time domain resource available for transmitting the PSCCH in the first time slot.

[0148] In some implementations, the starting position of the first time domain resource may be determined based on the time domain resources available for transmitting the PSCCH in the first time slot. For example, the starting position of the first time domain resource may be determined based on the starting position of the time domain resources available for transmitting the PSCCH in the first time slot. For another example, the starting position of the first time domain resource may be the starting position of the time domain resources available for transmitting the PSCCH in the first time slot, or in other words, the first time domain resource begins from the starting position corresponding to the time domain resources available for transmitting the PSCCH.

[0149] Of course, in the embodiment of the present application, the starting position of the first time domain resource can be determined based on the ending position of the time domain resource that can be used to transmit the PSCCH in the first time slot. For example, the starting position of the first time domain resource can be the starting position of the symbol next to the ending position of the time domain resource that can be used to transmit the PSCCH in the first time slot, or in other words, the first time domain resource starts from the starting position corresponding to the symbol next to the ending position of the time domain resource that can be used to transmit the PSCCH.

[0150] Continuing with FIG17A , time slot n+1 may be used as an example of a first time slot, and time domain symbols available for PSCCH transmission in time slot n+1 may include time domain symbols 1 to 3. In time slot n+1, the first time domain resources include time domain symbols 1 to 12, i.e., the first time domain resources start from the starting position of time domain symbol 1, or in other words, the first time domain resources start from the starting position corresponding to the time domain resources available for PSCCH transmission.

[0151] It should be noted that, in the embodiment of the present application, if the time domain resources available for transmitting the PSCCH are used to transmit the CSI-RS, the first time slot may not be used to transmit the PSCCH. Conversely, if the time domain resources available for transmitting the PSCCH are not used to transmit the CSI-RS, the first time slot may be used to transmit the PSCCH. Of course, the first time slot may not be used to transmit the PSCCH.

[0152] In some other implementations, the first time domain resource is determined based on the first time domain symbol after the time domain resource that can be used to transmit the PSCCH. For example, the starting position of the first time domain resource is determined based on the first time domain symbol after the time domain resource that can be used to transmit the PSCCH. For another example, the starting position of the first time domain resource can be determined based on the starting position of the first time domain symbol after the time domain resource that can be used to transmit the PSCCH. For another example, the starting position of the first time domain resource can be the starting position of the first time domain symbol after the time domain resource that can be used to transmit the PSCCH.

[0153] Continuing with FIG. 17B , time slot n+1 can be used as an example of a first time slot. Time domain symbols that can be used to transmit the PSCCH in time slot n+1 can include time domain symbols 1 to 3, and time domain symbol 4 is the first time domain symbol after time domain symbol 3. In time slot n+1, the first time domain resources include time domain symbols 4 to 12, and the starting position of the first time domain resources can be the starting position of time domain symbol 4, that is, the starting position of the first time domain symbol after the time domain resources that can be used to transmit the PSCCH.

[0154] It should be noted that, in the embodiment of the present application, the time domain resources that can be used to transmit the PSCCH in the first time slot can be used to transmit the PSCCH or may not be used to transmit the PSCCH.

[0155] Of course, in the embodiments of the present application, the specific manner of determining the starting position of the first time domain resource based on the time domain resources available for PSCCH transmission is not limited. For example, the ending position of the first time domain resource can be determined based on the ending position of the time domain resources available for PSCCH transmission in the first time slot. For another example, the ending position of the first time domain resource can be determined based on a certain position of the time domain resources available for PSCCH transmission in the first time slot and an offset value, wherein the offset value can be an integer greater than or equal to 0, and the offset value can be expressed as the number of time domain symbols.

[0156] In addition, in an embodiment of the present application, the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot, and may also include that the starting position of the first time domain resource can be determined based on the starting position (or ending position) of the time domain resource that can be used to transmit the PSCCH in the first time slot and an offset value, or the ending position of the first time domain resource can be determined based on the starting position or ending position of the time domain resource that can be used to transmit the PSCCH in the first time slot and an offset value, wherein the offset value can be an integer greater than or equal to 0, and the offset value can be expressed as the number of time domain symbols. Of course, in an embodiment of the present application, any position of the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot, and the embodiment of the present application is not limited to this.

[0157] Example 2: The first time domain resource is determined based on the time domain resource available for transmitting the second-order SCI in the first time slot.

[0158] In some implementations, the starting position of the first time domain resource is determined based on the time domain resources available for transmitting the second-order SCI in the first time slot. For example, the starting position of the first time domain resource is determined based on the first time domain symbol following the time domain resources available for transmitting the second-order SCI. For another example, the starting position of the first time domain resource can be determined based on the starting position of the first time domain symbol following the time domain resources available for transmitting the second-order SCI. For another example, the starting position of the first time domain resource can be the starting position of the first time domain symbol following the time domain resources available for transmitting the second-order SCI.

[0159] As shown in FIG17D , the first time unit may include two time slots: time slot n through time slot n+1. Time slot n+1 may be used as an example of a first time slot. The time domain symbols that may be used to transmit the second-order SCI in time slot n+1 may include time domain symbols 1 through 4. Accordingly, the first time domain symbol after time domain symbol 4 is time domain symbol 5. In time slot n+1, the first time domain resources include time domain symbols 5 through 12, meaning that the starting position of the first time domain resources may be the starting position of time domain symbol 5, i.e., the starting position of the first time domain symbol after the time domain resources that may be used to transmit the second-order SCI.

[0160] Of course, in the embodiment of the present application, the starting position of the first time domain resource can be determined based on the first time domain symbol of the time domain resource that can be used to transmit the second-order SCI. For another example, the starting position of the first time domain resource can be determined based on the starting position of the first time domain symbol of the time domain resource that can be used to transmit the second-order SCI. For another example, the starting position of the first time domain resource can be the starting position of the first time domain symbol of the time domain resource that can be used to transmit the second-order SCI.

[0161] It should be noted that, in the embodiment of the present application, the time domain resources in the first time slot that can be used to transmit the second-order SCI can be used to transmit the second-order SCI, and may also not be used to transmit the second-order SCI.

[0162] In some other implementations, the starting position of the first time domain resource may be determined based on the ending position of the time domain resource available for transmitting the second-order SCI in the first time slot. For another example, the starting position of the first time domain resource may be determined based on the ending position of the time domain resource available for transmitting the second-order SCI in the first time slot and an offset value, where the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols.

[0163] In the embodiment of the present application, the specific method for determining the time domain resources that can be used to transmit the second-order SCI is not limited. In some implementations, the starting position of the first time domain resource can be determined based on the starting position of the time domain resource that can be used to transmit the second-order SCI. For example, the starting position of the first time domain resource can be the starting position of the time domain resource that can be used to transmit the second-order SCI, or in other words, the first time domain resource starts from the starting position corresponding to the time domain resource that can be used to transmit the second-order SCI. For another example, the starting position of the first time domain resource can be determined based on the starting position of the time domain resource that can be used to transmit the second-order SCI in the first time slot and an offset value, wherein the offset value can be an integer greater than or equal to 0, and the offset value can be expressed as the number of time domain symbols.

[0164] In some other implementations, the end position of the first time domain resource is determined based on the start position of the time domain resource available for transmitting the second-order SCI in the first time slot. For example, the end position of the first time domain resource can be determined based on the start position of the time domain resource available for transmitting the second-order SCI in the first time slot and an offset value.

[0165] In some other implementations, the end position of the first time domain resource may be determined based on the end position of the time domain resource available for transmitting the second-order SCI in the first time slot. For example, the end position of the first time domain resource may be determined based on the end position of the time domain resource available for transmitting the second-order SCI in the first time slot and an offset value, where the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols. Of course, in the embodiments of the present application, any position of the first time domain resource is determined based on the time domain resource available for transmitting the second-order SCI in the first time slot.

[0166] It should be noted that, in the embodiment of the present application, if the time domain resources that can be used to transmit the second-order SCI are used to transmit the CSI-RS, the first time slot may not be used to transmit the second-order SCI. Conversely, if the time domain resources that can be used to transmit the second-order SCI are not used to transmit the CSI-RS, the first time slot may be used to transmit the second-order SCI. Of course, the first time slot may also not be used to transmit the second-order SCI.

[0167] Example 3: The first time domain resource is determined based on the second time domain symbol in the first time slot.

[0168] In some implementations, the first time domain resource is determined based on the second time domain symbol in the first time slot, and the time domain position of the first time domain resource can be determined based on the time domain position of the second time domain symbol in the first time slot. The time domain position of the first time domain resource can include the starting time domain position of the first time domain resource, or the ending time domain position of the first time domain resource, or any time domain position of the first time domain resource. The time domain position of the second time domain symbol can include the starting time domain position of the second time domain symbol, or the ending time domain position of the second time domain symbol, or any time domain position of the second time domain symbol.

[0169] In some implementations, the starting position of the first time domain resource is determined based on the second time domain symbol in the first time slot. For example, the starting position of the first time domain resource can be determined based on the starting position of the second time domain symbol in the first time slot. For another example, the starting position of the first time domain resource can be the starting position of the second time domain symbol in the first time slot, or in other words, the first time domain resource begins at the starting position corresponding to the second time domain symbol.

[0170] Continuing with FIG17A , time slot n+1 can be used as an example of a first time slot, and the second time domain symbol available for sidelink transmission in time slot n+1 is time domain symbol 1. In time slot n+1, the first time domain resource includes time domain symbol 1 to time domain symbol 12, i.e., the starting position of the first time domain resource is the starting position of time domain symbol 1, or in other words, the first time domain resource starts from the starting position corresponding to the second time domain symbol.

[0171] It should be noted that, in the embodiment of the present application, assuming that the index of the time domain symbol in the first time slot is sequentially numbered starting from 0, the second time domain symbol may be the time domain symbol with an index of 1 in the first time slot. Assuming that the index of the time domain symbol in the first time slot is sequentially numbered starting from 1, the second time domain symbol may be the time domain symbol with an index of 2 in the first time slot.

[0172] In addition, in the embodiments of the present application, the specific method for determining the starting position of the first time domain resource based on the second time domain symbol in the first time slot is not limited. For example, the starting position of the first time domain resource can be determined based on the ending position of the second time domain symbol in the first time slot. For another example, the starting position of the first time domain resource can be determined based on a certain position of the second time domain symbol in the first time slot and an offset value.

[0173] It should be noted that, in the embodiment of the present application, the first time domain resource is determined based on the second time domain symbol in the first time slot, which may include determining the end position of the first time domain resource based on the second time domain symbol in the first time slot. For example, the end position of the first time domain resource is determined based on the second time domain symbol in the first time slot and an offset value, wherein the offset value can be an integer greater than or equal to 0, and the offset value can be expressed as the number of time domain symbols. Of course, in the embodiment of the present application, any position of the first time domain resource is determined based on the second time domain symbol in the first time slot. This embodiment of the present application is not limited to this.

[0174] Example 4: The first time domain resource is determined based on the second time domain symbol available for sidelink transmission in the first time slot.

[0175] The second time domain symbol available for sideline transmission in the first time slot may be the second time domain symbol in the first time slot. For example, assuming that the indexes of the time domain symbols in the first time slot are sequentially numbered starting from 0, and the time domain symbols available for sideline transmission in the first time slot include multiple consecutive time domain symbols starting with time domain symbol 0, then the second time domain symbol available for sideline transmission in the first time slot may be time domain symbol 1 in the first time slot.

[0176] For another example, assuming that the indexes of the time domain symbols in the first time slot are numbered sequentially starting from 0, and the time domain symbols that can be used for side transmission in the first time slot include multiple consecutive time domain symbols starting with time domain symbol 1, then the second time domain symbol that can be used for side transmission in the first time slot can be time domain symbol 2 in the first time slot.

[0177] In some implementations, the first time domain resource is determined based on the second time domain symbol available for sideline transmission in the first time slot, and the time domain position of the first time domain resource can be determined based on the time domain position of the second time domain symbol available for sideline transmission in the first time slot. The time domain position of the first time domain resource can include the starting time domain position of the first time domain resource, or the ending time domain position of the first time domain resource, or any time domain position of the first time domain resource. The time domain position of the second time domain symbol available for sideline transmission can include the starting time domain position of the second time domain symbol available for sideline transmission, or the ending time domain position of the second time domain symbol available for sideline transmission, or any time domain position of the second time domain symbol available for sideline transmission.

[0178] In some implementations, the starting position of the first time domain resource is determined based on the second time domain symbol available for sideline transmission in the first time slot. For example, the starting position of the first time domain resource can be determined based on the starting position of the second time domain symbol available for sideline transmission in the first time slot. For another example, the starting position of the first time domain resource can be the starting position of the second time domain symbol available for sideline transmission in the first time slot, or in other words, the first time domain resource begins at the starting position corresponding to the second time domain symbol available for sideline transmission in the first time slot.

[0179] Continuing to refer to Figure 17A, time slot n+1 can be used as an example of the first time slot. The time domain symbols that can be used for side transmission in time slot n+1 include multiple consecutive time domain symbols with time domain symbol 0 as the starting time domain symbol. Accordingly, the second time domain symbol that can be used for side transmission in time slot n+1 is time domain symbol 1, then the starting position of the first time domain resource in time slot n+1 can be time domain symbol 1, or in other words, the first time domain resource starts from the starting position corresponding to time domain symbol 1 in time slot n+1.

[0180] It should be noted that, in the embodiment of the present application, assuming that the index of the time domain symbol in the first time slot is numbered from 0, the second time domain symbol may be the time domain symbol with an index of 1 in the first time slot. Assuming that the index of the time domain symbol in the first time slot is numbered from 1, the second time domain symbol may be the time domain symbol with an index of 2 in the first time slot.

[0181] In addition, in the embodiments of the present application, the specific manner of determining the starting position of the first time domain resource based on the second time domain symbol available for sideline transmission in the first time slot is not limited. For example, the starting position of the first time domain resource can be determined based on the ending position of the second time domain symbol available for sideline transmission in the first time slot. For another example, the starting position of the first time domain resource can be determined based on a certain position of the second time domain symbol available for sideline transmission in the first time slot and an offset value, where the offset value can be an integer greater than or equal to 0, and the offset value can be expressed as the number of time domain symbols.

[0182] It should be noted that, in the embodiment of the present application, the first time domain resource is determined based on the second time domain symbol available for sideline transmission in the first time slot, and the end position of the first time domain resource may be determined based on the second time domain symbol available for sideline transmission in the first time slot. For example, the end position of the first time domain resource is determined based on the second time domain symbol available for sideline transmission in the first time slot and an offset value, where the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols. Of course, in the embodiment of the present application, any position of the first time domain resource may be determined based on the second time domain symbol available for sideline transmission in the first time slot, and the embodiment of the present application is not limited to this.

[0183] Example 5: The first time domain resource is determined based on the protection symbol in the first time slot.

[0184] In some implementations, the end position of the first time domain resource is determined based on a guard symbol in the first time slot. For example, the end position of the first time domain resource can be determined based on a start position of a guard symbol in the first time slot. For another example, the end position of the first time domain resource can be adjacent to the start position of the guard symbol.

[0185] Continuing with FIG17A , time slot n+1 can be used as an example of a first time slot, and the guard symbol in time slot n+1 is time domain symbol 13. In time slot n+1, the end position of the first time domain resource is the end position of time domain symbol 12, that is, the end position of the first time domain resource is adjacent to the start position of the guard symbol.

[0186] In some other implementations, the end position of the first time domain resource may be determined based on the end position of the time domain symbol preceding the guard symbol in the first time slot. For example, the end position of the first time domain resource may be the end position of the time domain symbol preceding the guard symbol in the first time slot.

[0187] Continuing with FIG17A , time slot n+1 can be used as an example of a first time slot. The guard symbol in time slot n+1 is time domain symbol 13, and the time domain symbol preceding the guard symbol is time domain symbol 12. In time slot n+1, the end position of the first time domain resource is the end position of time domain symbol 12, that is, the end position of the first time domain resource is the end position of the time domain symbol preceding the guard symbol.

[0188] It should be noted that, in the embodiment of the present application, the first time domain resource is determined based on the guard symbol in the first time slot, which may include determining the starting position of the first time domain resource based on the guard symbol in the first time slot. For example, the starting position of the first time domain resource is determined based on the guard symbol in the first time slot and an offset value, wherein the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols. Of course, in the embodiment of the present application, any position of the first time domain resource is determined based on the guard symbol in the first time slot.

[0189] As described above, the first time unit may include multiple time slots. Accordingly, the first time slot may be a time slot other than the first time slot in the first time unit. Of course, in the embodiment of the present application, the first time slot may also be the first time slot in the first time unit.

[0190] If the first time unit includes multiple time slots, the examples of the first time slots described above can be combined with each other. The following description continues with reference to Figures 17A to 17D , taking the example of a first time unit including two consecutive time slots: time slot n and time slot n+1. It should be noted that for ease of understanding, the following lists only exemplary possible combinations, and the combinations in the embodiments of the present application are not limited to these.

[0191] As shown in Figure 17A, the first time domain symbol in time slot n and time slot n+1 is used for AGC, and the last time domain symbol is used for GP. Time slot n is used to transmit the PSCCH and second-order SCI, where the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol. The first PSSCH DMRS is located in the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting the PSCCH in time slot n are time domain symbols 1 to 3. The resources available for transmitting CSI-RS in time slot n+1 include time domain symbols 1 to 12. Time slot n+1 is not used for transmitting the PSCCH and second-order SCI.

[0192] As shown in Figure 17B, the first time domain symbol in time slot n and time slot n+1 is used for AGC, and the last time domain symbol is used for GP. Time slot n is used to transmit PSCCH and second-order SCI, where the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol. The first PSSCH DMRS is located in the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in time slot n are time domain symbols 1 to 3. Time domain symbols 1 to 3 in time slot n+1 are used for transmitting PSCCH, and time slot n+1 is not used for second-order SCI. In addition, time domain symbols 4 to 12 are resources that can be used to transmit CSI-RS.

[0193] As shown in Figure 17C, the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used as AGC, and the last time domain symbol is used as GP. Time slot n is used to transmit PSCCH and second-order SCI, wherein the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol, the first PSSCH DMRS is located in the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in time slot n are time domain symbol 1 to time domain symbol 3. Time domain symbols 1 to time domain symbol 3 in time slot n+1 are used to transmit PSCCH, and time slot n+1 is not used for second-order SCI. The resources that can be used to transmit CSI-RS in the first time unit include time domain symbol 12 in time slot n and time domain symbols 4 to time domain symbol 12 in time slot n+1.

[0194] As shown in Figure 17D, the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used as AGC, and the last time domain symbol is used as GP. Time slot n and time slot n+1 are used to transmit PSCCH and second-order SCI, wherein the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol in the two time slots, the first PSSCH DMRS is located in the second time domain symbol in the two time slots, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. In the two time slots, the time domain symbols for transmitting PSCCH are time domain symbol 1 to time domain symbol 3. In the first time unit, the resources that can be used to transmit CSI-RS include time domain symbol 12 in time slot n and time domain symbols 4 to time domain symbol 12 in time slot n+1.

[0195] As mentioned above, the last time domain symbol in a time slot is a protection symbol (also called a GP symbol), which is usually used by the terminal device for transceiver conversion or transceiver conversion, that is, when the terminal device sends and receives respectively in multiple adjacent time slots, transceiver conversion or transceiver conversion is required. In an embodiment of the present application, based on a multi-slot transmission scheme, the terminal sending CSI-RS continuously sends in multiple consecutive time slots (i.e., the first time unit), and the receiving end continuously receives in the multiple time slots. The terminal device does not need to perform transceiver conversion in multiple consecutive time slots. Therefore, in order to improve the transmission efficiency of CSI-RS, the protection symbol of the previous time slot in the adjacent time slots in the multiple time slots can be used to transmit CSI-RS.

[0196] In some embodiments, the guard symbol corresponds to the last time domain symbol available for sideline transmission in the previous time slot. That is, if the previous time slot includes resources for transmitting PSFCH, then the guard symbol preceding the resources for transmitting PSFCH is not used for transmitting CSI-RS.

[0197] For ease of understanding, the following describes the first time unit of another embodiment of the present application in conjunction with Figure 17E. As shown in Figure 17E, the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used as AGC. Time slot n and time slot n+1 are both used to transmit PSCCH and second-order SCI, wherein the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol in the two time slots, the first PSSCH DMRS is located in the second time domain symbol in the two time slots, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in the two time slots are time domain symbol 1 to time domain symbol 3.

[0198] In the first time unit, the resources available for CSI-RS transmission include time-domain symbols 12 to 13 in time slot n and time-domain symbols 4 to 12 in time slot n+1. In other words, time-domain symbol 13 in time slot n, which was originally used as a guard symbol, can be used to transmit CSI-RS.

[0199] In some scenarios, before sending the CSI-RS, the terminal transmitting the CSI-RS also needs to send indication information of the CSI-RS resource (also called "first indication information") so that the terminal receiving the CSI-RS can determine the CSI-RS to be subsequently received. Therefore, in some implementations, the above method further includes: the first terminal device receiving or sending the first indication information, where the first indication information is used to indicate the first CSI-RS resource.

[0200] It should be noted that if the first terminal device is a terminal that sends CSI-RS, the first terminal device may also be a terminal that sends the first indication information. If the first terminal device is a terminal that receives CSI-RS, the first terminal device may also be a terminal that receives the first indication information.

[0201] In some implementations, the resources for transmitting the first indication information may be located in the first time unit. For example, the time slot in which the resources for transmitting the first indication information are located may be the same as the time slot in which the resources that can be used to transmit the CSI-RS are located in the first time unit. For another example, the time slot in which the resources for transmitting the first indication information are located may be earlier than the time slot in which the resources that can be used to transmit the CSI-RS are located in the first time unit. Of course, in an embodiment of the present application, the first indication information may also be located in a time domain resource before the first time unit, for example, the time unit in which the first indication information is located is a time unit before the first time unit.

[0202] In some implementations, the first indication information is used to indicate one or more of the following: the time domain position of the first CSI-RS resource in the first time unit; the number of CSI-RS resources included in the first time unit; the number of time domain symbols included in the first CSI-RS resource; and CSI-RS resource information corresponding to the first CSI-RS resource.

[0203] Taking the example of the first indication information being used to indicate the time domain position of the first CSI-RS resource in the first time unit, in some implementations, the first CSI-RS resource may be the first CSI-RS resource in the first time unit, or in other words, the first CSI-RS resource may be the earliest CSI-RS resource in the first time unit. Of course, in the embodiment of the present application, the first CSI-RS resource may also be the latest CSI-RS resource in the first time unit.

[0204] In an embodiment of the present application, the first indication information may directly indicate the time domain position of the first CSI-RS resource. For example, the first indication information may include the index of the time slot where the first CSI-RS resource is located, and / or the index of the starting time domain symbol of the first CSI-RS resource in the time slot. For another example, the first indication information may include the index of the time slot where the first CSI-RS resource is located, and / or the index of the ending time domain symbol of the first CSI-RS resource in the time slot. Of course, in an embodiment of the present application, the first indication information may indirectly indicate the time domain position of the first CSI-RS resource. For example, the time domain position of the first CSI-RS resource may be indicated by indicating the first time domain position and an offset value, wherein the offset value may be an offset value between the first time domain position and the first CSI-RS resource, wherein the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols.

[0205] In some implementations, the first time domain position may include one of the following: the starting position of the time domain resources used to transmit PSCCH in the first time unit, the ending position of the time domain resources used to transmit PSCCH in the first time unit, the starting position of the time domain resources used to transmit the second-order SCI in the first time unit, the ending position of the time domain resources used to transmit the second-order SCI in the first time unit, the starting position of the first time domain symbol available for side transmission in the first time unit, the ending position of the first time domain symbol available for side transmission in the first time unit, the starting position of the first time domain symbol in the first time unit, the ending position of the first time domain symbol in the first time unit, the starting position of the first PSSCH DMRS symbol in the first time unit, and the ending position of the first PSSCH DMRS symbol in the first time unit.

[0206] In the embodiment of the present application, the specific form of the time domain position of the first CSI-RS resource is not limited. For example, the time domain position of the first CSI-RS resource may be the starting position of the first CSI-RS resource. For another example, the time domain position of the first CSI-RS resource may be the ending position of the first CSI-RS resource.

[0207] Taking the first indication information as an example of indicating the number of CSI-RS resources included in the first time unit, in some implementations, the first indication information may directly indicate the number of CSI-RS resources in the first time unit. For example, the first indication information may directly indicate that the number of CSI-RS resources included in the first time unit is N, where N is a positive integer greater than or equal to 1. In other implementations, the first indication information may indirectly indicate the number of CSI-RS resources in the first time unit. For example, the first indication information may include the total number of time domain symbols for transmitting CSI-RS in the first time unit, and the number of time domain symbols occupied by one CSI-RS resource. Accordingly, the receiving end may determine the number of CSI-RS resources included in the first time unit by dividing the total number of time domain symbols for transmitting CSI-RS in the first time unit by the number of time domain symbols included in one CSI-RS resource.

[0208] Take the example of the first indication information being used to indicate the number of time domain symbols included in the first CSI-RS resource, or in other words, the first indication information is used to indicate the number of time domain symbols included in one CSI-RS resource in the first time unit.

[0209] In some implementations, the first indication information may directly indicate the number of time domain symbols included in a CSI-RS resource. For example, the first indication information may directly indicate that the number of time domain symbols included in a CSI-RS resource is P. In other implementations, the first indication information may indirectly indicate the number of time domain symbols included in a CSI-RS resource. For example, the first indication information may include the total number of time domain symbols for transmitting CSI-RS in the first time unit and the number of CSI-RS resources included in the first time unit. Accordingly, the receiving end may determine the number of time domain symbols included in a CSI-RS resource by dividing the total number of time domain symbols for transmitting CSI-RS in the first time unit by the number of CSI-RS resources included in the first time unit. For another example, the number of CSI-RS resources in the first time unit may be associated with a spatial domain transmit filter and / or a spatial domain receive filter. For another example, the first indication information may indicate that the CSI-RS resource in the first time unit is used to determine the spatial domain transmit filter (or transmit beam) or to determine the spatial domain receive filter (or receive beam). If used to determine the spatial domain transmit filter, the number of time domain symbols included in one CSI-RS resource is 2; if used to determine the spatial domain receive filter, the number of time domain symbols included in one CSI-RS resource is 1.

[0210] Taking the first indication information as an example, which is used to indicate the CSI-RS resource information corresponding to the first CSI-RS resource, the CSI-RS resource information may include index information of the CSI-RS resource.

[0211] In some implementations, the first indication information may directly indicate the first CSI-RS resource information, for example, the first indication information may directly indicate the index information of the first CSI-RS resource. In other implementations, the first indication information may indirectly indicate the resource information of the first CSI-RS resource. For example, the first indication information may carry a first offset value, and accordingly, the receiving end may determine the index of the first CSI-RS resource based on the first offset value and a reference index. The reference index may be pre-configured, configured by a network device, or pre-defined by a protocol.

[0212] In some scenarios, the first time unit may include multiple CSI-RS resources. Accordingly, the first indication information may be used to indicate CSI-RS resource information corresponding to the multiple CSI-RS resources.

[0213] In some implementations, the first indication information may directly indicate the CSI-RS resource information corresponding to multiple CSI-RS resources. Taking the example that the CSI-RS resource information includes the index information of the CSI-RS resource, the first indication information may directly carry the index information of each CSI-RS resource in the multiple CSI-RS resources. In other implementations, the first indication information may indirectly indicate the CSI-RS resource information corresponding to multiple CSI-RS resources. Taking the example that the CSI-RS resource information includes the index information of the CSI-RS resource, the first indication information may carry the index information of the target CSI-RS resource in the multiple CSI-RS resources. Accordingly, the receiving end may determine the index information of other CSI-RS resources in the multiple CSI-RS resources based on the index information of the target CSI-RS resource.

[0214] In the embodiments of the present application, the target CSI-RS resource is not limited. For example, the target CSI-RS resource may be the first CSI-RS resource in the first time unit. For another example, the target CSI-RS resource may be the last CSI-RS resource in the first time unit. For another example, the target CSI-RS resource may be a CSI-RS resource in the first time unit.

[0215] In some implementations, the first indication information may be carried in one or more of the following information: SCI, media access control element (MAC CE), and PC5-RRC signaling.

[0216] Taking the first indication information carried in the SCI as an example, the SCI may be the SCI transmitted in the first time unit. For example, the first indication information may be carried in the first-order SCI in the first time unit. For another example, the first indication information may be carried in the second-order SCI in the first time unit.

[0217] Taking the first indication information carried in a MAC CE as an example, the MAC CE may be a MAC CE transmitted in a first time unit.

[0218] Of course, in the embodiments of the present application, the first indication information can be determined based on one or more of protocol predefined information, preconfigured information, and network configuration information. For example, the first indication information can be protocol predefined information, or for another example, the first indication information can be preconfigured information. For another example, the first indication information can be network configuration information.

[0219] It should be noted that in the embodiments of the present application, the various implementations of the first indication information described above may be used in combination with each other or independently of each other. If multiple implementations of the first indication information are used in combination, the first indication information in the multiple implementations may be a single piece of information or multiple different pieces of information, and the embodiments of the present application do not limit this.

[0220] In addition, if multiple implementation methods of the first indication information are used in combination, the information indicated by the first indication information can be carried through the same signaling, or can be carried through different signaling, which is not limited in this embodiment of the present application.

[0221] In some scenarios, after receiving the first indication information, the terminal device needs to process the first indication information or perform operations such as beam switching. Therefore, a time interval needs to be reserved between the time domain resource of the first indication information and the resource for transmitting CSI-RS (e.g., the first CSI-RS resource) to allow the receiving end to perform the corresponding operation.

[0222] That is to say, in some implementations, the time interval between the time domain resources of the first indication information and the first CSI-RS resources is greater than or equal to the first threshold, or in other words, the time interval between the time domain resources of the first indication information and the first CSI-RS resources is greater than or equal to the duration corresponding to the first threshold.

[0223] In some implementations, the time interval may include the time interval between the end position of the time domain resource of the first indication information and the start position of the first CSI-RS resource. Of course, in the embodiment of the present application, the time interval may include the time interval between the start position of the time domain resource of the first indication information and the start position of the first CSI-RS resource. The embodiment of the present application is not limited to this.

[0224] In the embodiments of the present application, the form of the first threshold is not limited. For example, the first threshold can be a period of time. In another example, the first threshold can be a duration corresponding to Q time domain resources, where Q is a positive integer greater than or equal to 1, and the time domain resources can be, for example, time domain symbols.

[0225] In some implementations, the first threshold is determined based on one or more of: pre-configuration information; pre-defined information; configuration information of the network device; parameter timeDurationForQCL; parameter sl-timeDurationForQCL; terminal capability of the terminal device receiving CSI-RS; indication information sent by the terminal device receiving CSI-RS, and indication information sent by the terminal device sending CSI-RS.

[0226] Taking the example of determining the first threshold based on pre-configuration information, where the pre-configuration information may include, for example, sideline BWP configuration information and / or resource pool configuration information, the first threshold may be determined based on the sideline BWP configuration information and / or resource pool configuration information. For example, the sideline BWP configuration information and / or resource pool configuration information may include first indication information, and the first indication information is used to indicate the first threshold.

[0227] Taking the example of determining the first threshold based on the configuration information of the network device, where the configuration information of the network device may include, for example, sideline BWP configuration information and / or resource pool configuration information, the first threshold may be determined based on the sideline BWP configuration information and / or resource pool configuration information. For example, the sideline BWP configuration information and / or resource pool configuration information may include first indication information, and the first indication information is used to indicate the first threshold.

[0228] Taking the first threshold as determined based on predefined information as an example, the predefined information may be implemented by pre-storing a corresponding code, table, or other information indicating the first threshold in the first terminal device, and this application does not limit the specific implementation method. For example, the predefined information may refer to information defined in a protocol.

[0229] Take the example of the first threshold being determined based on the terminal capability of the terminal device receiving the CSI-RS, or in other words, the first threshold is related to the terminal capability of the terminal device receiving the CSI-RS. For example, the higher the terminal capability of the terminal device receiving the CSI-RS, the less time is required for the terminal device receiving the CSI-RS to process the first indication information, or to perform operations such as beam switching, and accordingly, the shorter the duration corresponding to the first threshold can be. On the contrary, the lower the terminal capability of the terminal device receiving the CSI-RS, the more time is required for the terminal device receiving the CSI-RS to process the first indication information, or to perform operations such as beam switching, and accordingly, the longer the duration corresponding to the first threshold can be.

[0230] Taking the first threshold determined based on the indication information sent by the terminal device receiving the CSI-RS as an example, in some implementations, the terminal device receiving the CSI-RS can send indication information to the terminal device sending the CSI-RS to indicate the expected second threshold value. Accordingly, the terminal device sending the CSI-RS can determine the first threshold based on the expected second threshold.

[0231] In an embodiment of the present application, the second threshold may be related to the terminal capability of the terminal device receiving the CSI-RS. For example, the higher the terminal capability of the terminal device receiving the CSI-RS, the less time the terminal device receiving the CSI-RS requires to process the first indication information or perform operations such as beam switching, and accordingly, the shorter the duration corresponding to the second threshold may be. Conversely, the lower the terminal capability of the terminal device receiving the CSI-RS, the more time the terminal device receiving the CSI-RS requires to process the first indication information or perform operations such as beam switching, and accordingly, the longer the duration corresponding to the second threshold may be.

[0232] Taking the first threshold determined based on the indication information sent by the terminal device sending the CSI-RS as an example, in some implementations, the first threshold can be carried by one or more of the following information: SCI, MAC CE and PC5-RRC.

[0233] Taking the first threshold carried by the SCI as an example, the SCI may be the SCI transmitted in the first time unit. For example, the first threshold may be carried in the first-order SCI in the first time unit. For another example, the first threshold may be carried in the second-order SCI in the first time unit.

[0234] Taking the first threshold carried by a MAC CE as an example, the MAC CE may be a MAC CE transmitted in a first time unit.

[0235] It should be noted that, in an embodiment of the present application, if the first threshold is determined based on the indication information sent by the terminal device sending the CSI-RS, the indication information indicating the first threshold may be the same as the first indication information described above. Of course, in an embodiment of the present application, the indication information indicating the first threshold may be different from the first indication information described above.

[0236] In addition, it should be noted that in the embodiment of the present application, the first threshold is determined based on the above-mentioned one or more information. It can be understood that the above-mentioned one or more information can directly indicate the first threshold, or the parameters carried by the above-mentioned one or more information can determine (for example, calculate) the first threshold.

[0237] For ease of understanding, the following takes the first threshold of 7 time domain symbols as an example, and continues to introduce the first indication information in an embodiment of the present application and the position of the resources that can be used to transmit CSI-RS in the first time unit in combination with Figures 17A to 17E.

[0238] Continuing with FIG. 17A , the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used for AGC, and the last time domain symbol is used for GP. Time slot n is used to transmit the PSCCH and second-order SCI, where the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol. The first PSSCH DMRS is located in the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting the PSCCH in time slot n are time domain symbol 1 to time domain symbol 3. Time slot n+1 is not used to transmit the PSCCH and second-order SCI.

[0239] If the first indication information is carried in the second-order SCI in time slot n, the last time domain symbol of the second-order SCI is time domain symbol 4, and the first threshold is 7 time domain symbols, then the resources available for transmitting the CSI-RS in the first time unit are time domain symbols 1 to 12 in time slot n+1. The interval between time domain symbol 1 in time slot n+1 and the last time domain symbol of the second-order SCI is 10 time domain symbols, which meets the requirement of the first threshold.

[0240] Continuing with FIG. 17B , the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used as AGC, and the last time domain symbol is used as GP. Time slot n is used to transmit PSCCH and second-order SCI, wherein the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol, the first PSSCH DMRS is located at the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in time slot n are time domain symbol 1 to time domain symbol 4. Time slot n+1 is used to transmit PSCCH, and the time domain symbols for transmitting PSCCH are time domain symbol 1 to time domain symbol 3. Time slot n+1 is not used to transmit second-order SCI.

[0241] If the first indication information is carried in the first-order SCI in time slot n, the last time domain symbol for transmitting the first-order SCI may be the last time domain symbol for transmitting the PSCCH, that is, time domain symbol 3, and the first threshold is 7 time domain symbols. Accordingly, the resources available for transmitting the CSI-RS in the first time unit are time domain symbols 4 to 12 in time slot n+1. The interval between time domain symbol 4 in time slot n+1 and the last time domain symbol for transmitting the PSCCH is 14 time domain symbols, which meets the requirement of the first threshold.

[0242] Continuing with FIG. 17C , the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used as AGC, and the last time domain symbol is used as GP. Time slot n is used to transmit PSCCH and second-order SCI, wherein the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol, the first PSSCH DMRS is located at the second time domain symbol in time slot n, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in time slot n are time domain symbol 1 to time domain symbol 4. Time slot n+1 is used to transmit PSCCH, and the time domain symbols for transmitting PSCCH are time domain symbol 1 to time domain symbol 3. Time slot n+1 is not used to transmit second-order SCI.

[0243] If the first indication information is carried in the second-order SCI in time slot n, the last time domain symbol of the second-order SCI is time domain symbol 4, and the first threshold is 7 time domain symbols, then the resources available for transmitting the CSI-RS in the first time unit include time domain symbol 12 in time slot n, and time domain symbols 4 to 12 in time slot n+1. In other words, the resources available for transmitting the CSI-RS in time slot n+1 extend from the next time domain symbol of the resources transmitting the PSCCH to the time domain symbol before the GP. The interval between time domain symbol 12 in time slot n and the last time domain symbol of the second-order SCI is 7 time domain symbols, which meets the requirement of the first threshold.

[0244] Continuing with FIG. 17D , the first time unit includes time slot n and time slot n+1. The first time domain symbol in time slot n and time slot n+1 is used for AGC, and the last time domain symbol is used for GP. Time slot n and time slot n+1 are both used to transmit PSCCH and second-order SCI, where the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol of the two time slots. The first PSSCH DMRS is located in the second time domain symbol of the two time slots, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting PSCCH in time slot n and time slot n+1 are time domain symbols 1 to 3.

[0245] If the first indication information is carried in the second-order SCI in time slot n, the last time domain symbol of the second-order SCI is time domain symbol 4, and the first threshold is 7 time domain symbols, then the resources available for transmitting the CSI-RS in the first time unit include time domain symbol 12 in time slot n, and time domain symbols 5 to 12 in time slot n+1. In other words, the resources available for transmitting the CSI-RS in time slot n+1 extend from the time domain symbol following the resource for transmitting the second-order SCI to the time domain symbol preceding the GP. The interval between time domain symbol 12 in time slot n and the last time domain symbol of the second-order SCI is 7 time domain symbols, which meets the requirement of the first threshold.

[0246] Continuing with FIG. 17E , the first time unit includes time slot n and time slot n+1. Both time slot n and time slot n+1 are used to transmit the PSCCH and second-order SCI, where the second-order SCI is mapped starting from the first PSSCH DMRS time domain symbol of the two time slots. The first PSSCH DMRS is located in the second time domain symbol of the two time slots, and the last time domain symbol corresponding to the second-order SCI is time domain symbol 4. The time domain symbols for transmitting the PSCCH in time slot n and time slot n+1 are time domain symbols 1 to 3. The first time domain symbol in time slot n and time slot n+1 is used for AGC. The last time domain symbol in time slot n+1 is used for GP.

[0247] If the first indication information is carried in the second-order SCI in time slot n, the last time domain symbol of the second-order SCI is time domain symbol 4, and the first threshold is 7 time domain symbols, then the resources available for CSI-RS transmission in the first time unit include time domain symbols 12 to 13 in time slot n, and time domain symbols 5 to 12 in time slot n+1. In other words, the time domain symbols available for GP in time slot n are used as resources available for CSI-RS transmission. Accordingly, the resources available for CSI-RS transmission in time slot n+1 extend from the time domain symbol next to the resources for transmitting the second-order SCI to the time domain symbol before the GP. The interval between time domain symbol 12 in time slot n and the last time domain symbol of the second-order SCI is 7 time domain symbols, which meets the requirements of the first threshold.

[0248] In some scenarios, the above-mentioned first CSI-RS resource can be a transmission resource reserved for a terminal device for sending CSI-RS. That is to say, the terminal device for sending CSI-RS can reserve resources that can be used to transmit CSI-RS in the first time unit by means of resource reservation, or the terminal device for sending CSI-RS can reserve the first time unit including CSI-RS transmission resources by means of resource reservation. As described above, the first time unit may include multiple consecutive time slots. Of course, in an embodiment of the present application, the first time unit may also include one time slot. The following is an introduction in combination with Example 2, taking the example of the first time unit including one time slot.

[0249] Example 2

[0250] In the embodiment of the present application, the first time unit may include a time slot (hereinafter referred to as the "second time slot"). Accordingly, the first CSI-RS resource may be located in the second time slot. The first CSI-RS resource may refer to the introduction of the first CSI-RS resource in Example 1. Furthermore, the structure of the second time slot may refer to the introduction of the first time slot above. For the sake of brevity, this will not be repeated below.

[0251] It should be noted that, in the embodiment of the present application, the second time slot may include one or more CSI-RS resources. If the second time slot includes multiple CSI-RS resources, the first CSI-RS resource may be a CSI-RS resource in the second time slot. For example, the first CSI-RS resource may be the first CSI-RS resource in the second time slot. For example, the first CSI-RS resource may be the last CSI-RS resource in the second time slot, which is not limited in the embodiment of the present application. Of course, if the second time slot includes only one CSI-RS resource, then the CSI-RS resource is the first CSI-RS resource.

[0252] In some scenarios, a terminal device transmitting a CSI-RS may reserve a first CSI-RS resource by transmitting first indication information. In some implementations, the first indication information may be transmitted in a third time slot that is earlier than the second time slot in the time domain. Of course, in embodiments of the present application, the first indication information may also be in the second time slot.

[0253] Typically, after receiving the first indication information, the terminal device receiving the CSI-RS needs to process the first indication information or perform operations such as beam switching. Therefore, a time interval needs to be reserved between the time domain resources of the first indication information and the resources of the first CSI-RS so that the terminal device receiving the CSI-RS can perform the corresponding operation. In some implementations, if the first indication information is transmitted by the third time slot, the time interval between the second time slot and the third time slot is greater than or equal to the first threshold, or in other words, the time interval between the second time slot and the third time slot is greater than or equal to the duration corresponding to the first threshold.

[0254] In some implementations, the time interval between the second time slot and the third time slot may be determined based on the time interval between the starting time domain position of the second time slot and the first moment. For example, the time interval between the second time slot and the third time slot may be equal to the time interval between the starting time domain position of the second time slot and the first moment. For another example, the time interval between the second time slot and the third time slot may be calculated based on the time interval between the starting time domain position of the second time slot and the first moment.

[0255] Of course, in the embodiment of the present application, the time interval between the second time slot and the third time slot can be determined based on the time interval between the first CSI-RS resource in the second time slot and the first moment. In some implementations, the time interval between the first CSI-RS resource and the first moment can be the time interval between the starting position of the first CSI-RS resource and the first moment. In other implementations, the time interval between the first CSI-RS resource and the first moment can be the time interval between the ending position of the first CSI-RS resource and the first moment. Of course, in the embodiment of the present application, the time interval between the first CSI-RS resource and the first moment can be the time interval between any position of the first CSI-RS resource and the first moment.

[0256] In some implementations, the above-mentioned first moment includes one of the following: the starting moment of the third time slot; the ending moment of the third time slot; the starting moment of the time domain resources of the first indication information transmitted in the third time slot; the ending moment of the time domain resources of the first indication information transmitted in the third time slot; the starting moment of the next time domain symbol of the time domain resources of the first indication information transmitted in the third time slot; the starting moment of the time domain resources of the PSCCH in the third time slot; the ending moment of the time domain resources of the PSCCH in the third time slot; the starting moment of the second-order SCI in the third time slot; the ending moment of the second-order SCI in the third time slot.

[0257] Taking the first moment including the start moment of the third time slot as an example, in some implementations, the start moment of the third time slot can be understood as the start position of the third time slot, or the start position of the first time domain symbol in the third time slot.

[0258] Taking the first moment including the end moment of the third time slot as an example, in some implementations, the end moment of the third time slot can be understood as the end position of the third time slot, or the end position of the last time domain symbol in the third time slot.

[0259] Taking the starting moment of the time domain resources of the first indication information transmitted in the third time slot as an example, in some implementations, the starting moment of the time domain resources of the first indication information transmitted can be understood as the starting position of the time domain resources of the first indication information transmitted, or, in other words, the starting position of the first time domain symbol in the time domain resources of the first indication information transmitted.

[0260] Taking the end moment of the time domain resources of the first indication information transmitted in the third time slot as an example, in some implementations, the end moment of the time domain resources of the first indication information transmitted can be understood as the end position of the time domain resources of the first indication information transmitted, or, in other words, the end position of the last time domain symbol in the time domain resources of the first indication information transmitted.

[0261] Taking the starting moment of the time domain resources of PSCCH in the third time slot as an example, in some implementations, the starting moment of the time domain resources of PSCCH can be understood as the starting position of the time domain resources of PSCCH, or the starting position of the first time domain symbol in the time domain resources of PSCCH.

[0262] Taking the end moment of the time domain resources of PSCCH in the third time slot included in the first moment as an example, in some implementations, the end moment of the time domain resources of PSCCH can be understood as the end position of the time domain resources of PSCCH, or the end position of the last time domain symbol in the time domain resources of PSCCH.

[0263] Taking the first moment including the starting moment of the second-order SCI in the third time slot as an example, in some implementations, the starting moment of the time domain resources of the second-order SCI can be understood as the starting position of the time domain resources of the second-order SCI, or the starting position of the first time domain symbol in the time domain resources of the second-order SCI.

[0264] Taking the end moment of the time domain resources of the second-order SCI in the third time slot as an example, in some implementations, the end moment of the time domain resources of the second-order SCI can be understood as the end position of the time domain resources of the second-order SCI, or the end position of the last time domain symbol in the time domain resources of the second-order SCI.

[0265] It should be noted that the above introduces the meaning of the first threshold in the embodiments of the present application. For the implementation method of the first threshold and / or the configuration method of the first threshold, please refer to the introduction of the first threshold in Example 1. For the sake of brevity, it will not be repeated here.

[0266] The above describes the transmission method of the first indication information, and the following describes the meaning of the first indication information in the embodiment of the present application.

[0267] In some implementations, the first indication information is used to indicate one or more of the following: the time domain position of the first CSI-RS resource in the second time slot; the number of CSI-RS resources included in the second time slot; the number of time domain symbols included in the first CSI-RS resource; and CSI-RS resource information corresponding to the first CSI-RS resource.

[0268] Taking the first indication information as an example of indicating the time domain position of the first CSI-RS resource in the second time slot, the first CSI-RS resource may be the first CSI-RS resource in the second time slot, or in other words, the first CSI-RS resource may be the earliest CSI-RS resource in the second time slot. Of course, in the embodiment of the present application, the first CSI-RS resource may also be the latest CSI-RS resource in the second time slot.

[0269] In some implementations, the first indication information may directly indicate the time domain position of the first CSI-RS resource. For example, the first indication information may include the index of the second time slot and the index of the starting time domain symbol of the first CSI-RS resource. For another example, the first indication information may include the index of the second time slot and the index of the ending time domain symbol of the first CSI-RS resource. Of course, in an embodiment of the present application, the first indication information may indirectly indicate the time domain position of the first CSI-RS resource. For example, the first indication information may indicate the time domain position of the first CSI-RS resource by indicating the first time domain position and the offset value. The offset value may be an offset value between the first time domain position and the first CSI-RS resource, wherein the offset value may be an integer greater than or equal to 0, and the offset value may be expressed as the number of time domain symbols.

[0270] In some implementations, the first time domain position may include one of the following: the starting position of the time domain resources used to transmit PSCCH in the second time slot or the third time slot, the ending position of the time domain resources used to transmit PSCCH in the second time slot or the third time slot, the starting position of the time domain resources used to transmit second-order SCI in the second time slot or the third time slot, the ending position of the time domain resources used to transmit second-order SCI in the second time slot or the third time slot, the starting position of the first time domain symbol available for side transmission in the second time slot or the third time slot, the ending position of the first time domain symbol available for side transmission in the second time slot or the third time slot, the starting position of the first time domain symbol in the second time slot or the third time slot, the ending position of the first time domain symbol in the second time slot or the third time slot, the starting position of the first PSSCH DMRS symbol in the second time slot or the third time slot, and the ending position of the first PSSCH DMRS symbol in the second time slot or the third time slot.

[0271] In the embodiment of the present application, the specific form of the time domain position of the first CSI-RS resource is not limited. In some implementations, the time domain position of the first CSI-RS resource may be the starting position of the first CSI-RS resource. For example, the starting position of the first CSI-RS resource may be determined based on the starting position of the time slot where the first CSI-RS resource is located, and / or the starting position of the starting time domain symbol of the first CSI-RS resource in the time slot. In other implementations, the time domain position of the first CSI-RS resource may be the ending position of the first CSI-RS resource. For example, the ending position of the first CSI-RS resource may be determined based on the ending position of the time slot where the first CSI-RS resource is located, and / or the ending position of the last time domain symbol of the first CSI-RS resource in the time slot.

[0272] Taking the first indication information as an example of indicating the number of CSI-RS resources included in the second time slot, in some implementations, the first indication information may directly indicate the number of CSI-RS resources in the second time slot. For example, the first indication information may directly indicate that the number of CSI-RS resources included in the second time slot is N, where N is a positive integer greater than or equal to 1. In other implementations, the first indication information may indirectly indicate the number of CSI-RS resources in the second time slot. For example, the first indication information may include the total number of time domain symbols for transmitting CSI-RS in the second time slot and the number of time domain symbols occupied by one CSI-RS resource. Accordingly, the terminal receiving the CSI-RS may determine the number of CSI-RS resources included in the second time slot by dividing the total number of time domain symbols for transmitting CSI-RS in the second time slot by the number of time domain symbols included in one CSI-RS resource. For another example, the number of CSI-RS resources in the second time slot may be associated with a spatial domain transmit filter and / or a spatial domain receive filter. For another example, the first indication information may indicate that the CSI-RS resource in the second time slot is used to determine the spatial domain transmit filter (or transmit beam) or to determine the spatial domain receive filter (or receive beam). If used to determine the spatial domain transmit filter, the number of time domain symbols included in one CSI-RS resource in the second time slot is 2. If used to determine the spatial domain receive filter, the number of time domain symbols included in one CSI-RS resource in the second time slot is 1.

[0273] Take the example of the first indication information being used to indicate the number of time domain symbols included in the first CSI-RS resource, or in other words, the first indication information is used to indicate the number of time domain symbols included in a CSI-RS resource in the second time slot.

[0274] In some implementations, the first indication information may directly indicate the number of time domain symbols included in a CSI-RS resource. For example, the first indication information may directly indicate that the number of time domain symbols included in a CSI-RS resource is P. In other implementations, the first indication information may indirectly indicate the number of time domain symbols included in a CSI-RS resource. For example, the first indication information may include the total number of time domain symbols for transmitting CSI-RS in the second time slot and the number of CSI-RS resources included in the second time slot. Accordingly, the terminal receiving the CSI-RS may determine the number of time domain symbols included in a CSI-RS resource by dividing the total number of time domain symbols for transmitting CSI-RS in the second time slot by the number of CSI-RS resources included in the second time slot.

[0275] Taking the first indication information as an example, which is used to indicate the CSI-RS resource information corresponding to the first CSI-RS resource, the CSI-RS resource information may include index information of the CSI-RS resource.

[0276] In some implementations, the first indication information may directly indicate the first CSI-RS resource information. Taking the example that the first CSI-RS resource information includes the index information of the first CSI-RS resource, the first indication information may directly indicate the index information of the first CSI-RS resource. In other implementations, the first indication information may indirectly indicate the resource information of the first CSI-RS resource. Taking the example that the first CSI-RS resource information includes the index information of the first CSI-RS resource, the first indication information may carry a first offset value. Accordingly, the terminal receiving the CSI-RS may determine the index of the first CSI-RS resource based on the first offset value and the reference index. The reference index may be pre-configured, configured by a network device, or pre-defined by a protocol.

[0277] In some scenarios, the second time slot may include multiple CSI-RS resources. Accordingly, the first indication information may be used to indicate CSI-RS resource information corresponding to the multiple CSI-RS resources.

[0278] In some implementations, the first indication information may directly indicate the CSI-RS resource information corresponding to multiple CSI-RS resources. For example, the first indication information may directly indicate the index information of each CSI-RS resource in the multiple CSI-RS resources. In other implementations, the first indication information may indirectly indicate the CSI-RS resource information corresponding to the multiple CSI-RS resources. For example, the first indication information may carry the index information of the target CSI-RS resource in the multiple CSI-RS resources. Accordingly, the terminal receiving the CSI-RS may determine the index information of other CSI-RS resources in the multiple CSI-RS resources based on the index information of the target CSI-RS resource.

[0279] In the embodiments of the present application, the target CSI-RS resource is not limited. For example, the target CSI-RS resource may be the first CSI-RS resource in the second time slot. For another example, the target CSI-RS resource may be the last CSI-RS resource in the second time slot. For another example, the target CSI-RS resource may be a CSI-RS resource in the second time slot.

[0280] In some implementations, the first indication information may be carried in one or more of the following information: SCI, MAC CE, and PC5-RRC signaling.

[0281] Taking the first indication information carried in the SCI as an example, the SCI may be the SCI transmitted in the third time slot. For example, the first indication information may be carried in the first-order SCI in the third time slot. For another example, the first indication information may be carried in the second-order SCI in the third time slot.

[0282] Taking the first indication information carried in a MAC CE as an example, the MAC CE may be a MAC CE transmitted in the third time slot.

[0283] Of course, in the embodiments of the present application, the first indication information can be determined based on one or more of protocol predefined information, preconfigured information, and network configuration information. For example, the first indication information can be protocol predefined information, or for another example, the first indication information can be preconfigured information. For another example, the first indication information can be network configuration information.

[0284] It should be noted that in the embodiments of the present application, the various implementations of the first indication information described above may be used in combination with each other or independently of each other. If multiple implementations of the first indication information are used in combination, the first indication information in the multiple implementations may be a single piece of information or multiple different pieces of information, and the embodiments of the present application do not limit this.

[0285] In addition, if multiple implementation methods of the first indication information are used in combination, the information indicated by the first indication information can be carried through the same signaling, or can be carried through different signaling, which is not limited in this embodiment of the present application.

[0286] The resource preemption mechanism is supported in known communication protocols. That is to say, if the terminal device transmits PSCCH / PSSCH in the first time slot, the SCI carried by the PSCCH can usually reserve 1 or 2 transmission resources, which are usually used for the retransmission of the PSSCH. However, if the transmission resources reserved by the SCI conflict with the transmission resources reserved by other terminals, and the priority value of the terminal device is higher than the priority values ​​of other terminals (that is, the priority of the terminal device is lower than the priority of other terminals), the transmission resources reserved by the terminal device will be preempted (pre-empted). At this time, the terminal device needs to reselect resources to replace the preempted resources.

[0287] Based on the above resource preemption mechanism, assuming that the transmission resources in the second time slot reserved by the terminal device sending CSI-RS are used to transmit CSI-RS, then the transmission resources reserved by the terminal device sending CSI-RS may be preempted by other terminals. At this time, the terminal device sending CSI-RS needs to reselect resources. However, the time domain position of the newly selected transmission resource is unknown to the terminal device receiving CSI-RS. At this time, the terminal device receiving CSI-RS cannot receive CSI-RS, which will cause CSI-RS transmission failure, and thus cannot perform beam training or beam selection based on CSI-RS.

[0288] Therefore, to address the above issues, an embodiment of the present application further provides a solution for sideline communication. In one implementation, the sideline resource preemption enable parameter (denoted by "sl-PreemptionEnable") is set to the highest priority, or in other words, the priority value of sl-PreemptionEnable is set to the minimum value.

[0289] For example, the value of sl-PreemptionEnable can be set to the value corresponding to the highest priority, or in other words, sl-PreemptionEnable can be set to the minimum priority value. In this case, the priority of other terminal devices will not be higher than the priority corresponding to sl-PreemptionEnable, which means that other terminal devices cannot preempt the first CSI-RS resource.

[0290] In another implementation, the sidelink priority of the first CSI-RS resource is the highest priority, or in other words, the sidelink priority level of the first CSI-RS resource is the minimum value. In this case, the priority of other terminal devices will not be higher than the priority corresponding to the first CSI-RS resource, that is, other terminal devices cannot preempt the first CSI-RS resource.

[0291] In another implementation, the sideline priority of the sideline transmission including the first CSI-RS resource is the highest priority, or in other words, the sideline priority level of the sideline transmission including the first CSI-RS resource is the minimum value. In this case, the priority of other terminal devices will not be higher than the priority corresponding to the first CSI-RS resource, that is, other terminal devices cannot preempt the first CSI-RS resource.

[0292] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 17 . The device embodiment of the present application is described in detail below in conjunction with Figures 18 and 19 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0293] FIG18 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 1800 shown in FIG18 may be the first terminal device described above. The terminal device 1800 may include a processing unit 1810.

[0294] Processing unit 1810 is used to determine a first channel state information reference signal CSI-RS resource in a first time unit, wherein the first time unit satisfies one of the following: the first time unit includes multiple consecutive time slots; the first time unit includes one time slot, and the first CSI-RS resource is a transmission resource reserved for a terminal device for sending CSI-RS.

[0295] In one possible implementation, the first time unit includes a first time slot that can be used to transmit CSI-RS, the first time slot includes the first CSI-RS resource, and the first time slot satisfies one or more of the following: the first time slot is only used to transmit the CSI-RS; the first time slot is not used to transmit the physical sidelink control channel PSCCH; the first time slot is not used to transmit the second-order sidelink control information SCI; the first time slot is not used to transmit the physical sidelink shared channel PSSCH.

[0296] In one possible implementation, the first time unit includes a first time slot that can be used to transmit CSI-RS, the first time slot includes the first CSI-RS resource, and the first time domain resource in the first time slot that can be used to transmit the CSI-RS satisfies one or more of the following: the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit PSCCH in the first time slot; the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit second-order SCI in the first time slot; the starting position of the first time domain resource is determined based on the second time domain symbol that can be used for side transmission in the first time slot; the starting position of the first time domain resource is determined based on the second time domain symbol in the first time slot; and the ending position of the first time domain resource is determined based on the protection symbol in the first time slot.

[0297] In one possible implementation, if the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit PSCCH in the first time slot, the first time domain resource starts from the starting position corresponding to the time domain resource that can be used to transmit PSCCH; or the starting position of the first time domain resource is determined based on the first time domain symbol after the time domain resource that can be used to transmit PSCCH.

[0298] In one possible implementation, if the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the second-order SCI in the first time slot, the starting position of the first time domain resource is determined according to the first time domain symbol after the time domain resource that can be used to transmit the second-order SCI.

[0299] In a possible implementation, the first time unit includes multiple time slots, and the first time slot is a time slot other than the first time slot among the multiple time slots; or, the first time unit is the first time slot.

[0300] In a possible implementation, the first time unit includes multiple time slots, and a protection symbol of a previous time slot in adjacent time slots among the multiple time slots is used to transmit a CSI-RS.

[0301] In a possible implementation, the terminal device further includes: a communication unit, configured to receive or send first indication information, where the first indication information is used to indicate the first CSI-RS resource.

[0302] In one possible implementation, the first indication information is used to indicate one or more of the following: the time domain position of the first CSI-RS resource in the first time unit; the number of CSI-RS resources included in the first time unit; the number of time domain symbols included in the first CSI-RS resource; and CSI-RS resource information corresponding to the first CSI-RS resource.

[0303] In a possible implementation manner, the first indication information is carried in one or more of the following information: SCI, media access control element MAC CE, and PC5-radio resource control PC5-RRC signaling.

[0304] In one possible implementation, the first time unit includes multiple time slots, and the first indication information is transmitted by the first time unit; or, the first time unit includes one time slot, the first time unit is the second time slot, and the first indication information is transmitted by a third time slot whose time domain position is earlier than the second time slot.

[0305] In a possible implementation manner, the time interval between the time domain resource of the first indication information and the first CSI-RS resource is greater than or equal to a first threshold.

[0306] In a possible implementation, if the first indication information is transmitted by the third time slot, the time interval between the second time slot and the third time slot is greater than or equal to a first threshold.

[0307] In one possible implementation, the time interval between the second time slot and the third time slot is determined based on the time interval between the starting time domain position of the second time slot and a first moment, and the first moment includes one of the following: the starting moment of the third time slot; the ending moment of the third time slot; the starting moment of the time domain resources of the first indication information transmitted in the third time slot; the ending moment of the time domain resources of the first indication information transmitted in the third time slot; the starting moment of the time domain resources of the PSCCH in the third time slot; the ending moment of the time domain resources of the PSCCH in the third time slot; the starting moment of the second-order SCI in the third time slot; and the ending moment of the second-order SCI in the third time slot.

[0308] In one possible implementation, the first threshold is determined based on one or more of the following: pre-configuration information; pre-defined information; network device configuration information; parameter timeDurationForQCL; parameter sl-timeDurationForQCL; terminal capability of the terminal device receiving CSI-RS; and indication information sent by the terminal device receiving CSI-RS.

[0309] In a possible implementation manner, the first threshold is carried by one or more of the following information: SCI, MAC CE, and PC5-RRC.

[0310] In a possible implementation manner, the sidelink resource preemption enabling parameter corresponding to the first CSI-RS resource has the highest priority; and / or the sidelink priority of the first CSI-RS resource has the highest priority.

[0311] In a possible implementation, the plurality of consecutive time slots include one or more of the following: a plurality of consecutive physical time slots; a plurality of consecutive time slots that can be used for sidelink transmission; and a plurality of consecutive time slots in a resource pool.

[0312] In an optional embodiment, the processing unit 1810 may be a processor 1910. The terminal device 1800 may further include a transceiver 1930 and a memory 1920, as specifically shown in FIG19 .

[0313] Figure 19 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 19 indicate that the unit or module is optional. Device 1900 may be used to implement the method described in the above method embodiment. Device 1900 may be a chip, a terminal device, or a network device.

[0314] The device 1900 may include one or more processors 1910. The processor 1910 may support the device 1900 to implement the method described in the above method embodiment. The processor 1910 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 another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0315] The apparatus 1900 may further include one or more memories 1920. The memories 1920 store programs that can be executed by the processor 1910, causing the processor 1910 to perform the methods described in the above method embodiments. The memories 1920 may be independent of the processor 1910 or integrated into the processor 1910.

[0316] The apparatus 1900 may further include a transceiver 1930. The processor 1910 may communicate with other devices or chips via the transceiver 1930. For example, the processor 1910 may transmit and receive data with other devices or chips via the transceiver 1930.

[0317] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0318] The present 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 the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0319] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0320] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0321] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0322] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0323] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0324] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0325] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0326] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0327] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0328] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean 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 the present application.

[0329] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0330] The units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0331] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0332] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. 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 computer-readable storage medium. 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 a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0333] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for sideline communication, characterized in that: include: The first terminal device determines a first channel state information reference signal CSI-RS resource in a first time unit, where the first time unit satisfies one of the following: The first time unit includes a plurality of consecutive time slots; The first time unit includes a time slot, and the first CSI-RS resource is a transmission resource reserved for a terminal device for sending a CSI-RS.

2. The method according to claim 1, characterized in that The first time unit includes a first time slot that can be used to transmit a CSI-RS, the first time slot includes the first CSI-RS resource, and the first time slot satisfies one or more of the following: The first time slot is only used for transmitting the CSI-RS; The first time slot is not used for transmitting a physical side control channel PSCCH; The first time slot is not used for transmitting second-order side control information SCI; The first time slot is not used for transmitting a physical sidelink shared channel PSSCH.

3. The method according to claim 1 or 2, characterized in that The first time unit includes a first time slot that can be used to transmit a CSI-RS, the first time slot includes the first CSI-RS resource, and a first time domain resource in the first time slot that can be used to transmit the CSI-RS satisfies one or more of the following: The starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot; The starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the second-order SCI in the first time slot; The starting position of the first time domain resource is determined based on a second time domain symbol that can be used for sideline transmission in the first time slot; The starting position of the first time domain resource is determined based on the second time domain symbol in the first time slot; and The end position of the first time domain resource is determined based on a guard symbol in the first time slot.

4. The method according to claim 3, characterized in that If the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot, The first time domain resource starts from a starting position corresponding to the time domain resource that can be used to transmit the PSCCH; or The starting position of the first time domain resource is determined according to the first time domain symbol after the time domain resource that can be used to transmit the PSCCH.

5. The method according to claim 3, characterized in that If the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the second-order SCI in the first time slot, The starting position of the first time domain resource is determined according to the first time domain symbol after the time domain resource that can be used to transmit the second-order SCI.

6. The method according to any one of claims 2 to 5, characterized in that: The first time unit includes a plurality of time slots, and the first time slot is a time slot other than the first time slot among the plurality of time slots; or, The first time unit is the first time slot.

7. The method according to any one of claims 1 to 6, characterized in that The first time unit includes a plurality of time slots, and a guard symbol of a previous time slot in adjacent time slots among the plurality of time slots is used to transmit a CSI-RS.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: The first terminal device receives or sends first indication information, where the first indication information is used to indicate the first CSI-RS resource.

9. The method according to claim 8, characterized in that The first indication information is used to indicate one or more of the following: A time domain position of the first CSI-RS resource in the first time unit; the number of CSI-RS resources included in the first time unit; the number of time domain symbols included in the first CSI-RS resource; CSI-RS resource information corresponding to the first CSI-RS resource.

10. The method according to claim 8 or 9, characterized in that The first indication information is carried by one or more of the following information: SCI, media access control element MAC CE and PC5-radio resource control PC5-RRC signaling.

11. The method according to any one of claims 8 to 10, characterized in that: The first time unit includes a plurality of time slots, and the first indication information is transmitted by the first time unit; or, The first time unit includes a time slot, the first time unit is a second time slot, and the first indication information is transmitted by a third time slot whose time domain position is earlier than the second time slot.

12. The method according to claim 11, characterized in that The time interval between the time domain resource of the first indication information and the first CSI-RS resource is greater than or equal to a first threshold.

13. The method according to claim 11, characterized in that If the first indication information is transmitted by the third time slot, the time interval between the second time slot and the third time slot is greater than or equal to a first threshold.

14. The method according to claim 13, characterized in that The time interval between the second time slot and the third time slot is determined based on the time interval between the start time domain position of the second time slot and a first moment, where the first moment includes one of the following: The starting time of the third time slot; The end time of the third time slot; a starting time of a time domain resource of the first indication information transmitted in the third time slot; an end time of the time domain resource of the first indication information transmitted in the third time slot; The starting time of the time domain resources of the PSCCH in the third time slot; The end time of the time domain resources of the PSCCH in the third time slot; The starting time of the second-order SCI in the third time slot; The end time of the second-order SCI in the third time slot.

15. The method according to any one of claims 12 to 14, characterized in that The first threshold is determined based on one or more of the following: Pre-configuration information; Predefined information; Network device configuration information; Parameter timeDurationForQCL; Parameter sl-timeDurationForQCL; Terminal capabilities of terminal devices receiving the CSI-RS; and Indication information sent by the terminal device receiving CSI-RS.

16. The method according to any one of claims 12 to 15, characterized in that The first threshold is carried by one or more of the following information: SCI, MAC CE and PC5-RRC.

17. The method according to any one of claims 1 to 16, characterized in that The sidelink resource preemption enabling parameter corresponding to the first CSI-RS resource has the highest priority; and / or The sideline priority of the first CSI-RS resource is the highest priority.

18. The method according to any one of claims 1 to 17, characterized in that The plurality of consecutive time slots include one or more of the following: Multiple consecutive physical time slots; A plurality of consecutive time slots available for sideline transmission; Multiple consecutive time slots in a resource pool.

19. A terminal device, characterized in that: The terminal device is a first terminal device, comprising: A processing unit, configured to determine a first channel state information reference signal CSI-RS resource in a first time unit, wherein the first time unit satisfies one of the following: The first time unit includes a plurality of consecutive time slots; The first time unit includes a time slot, and the first CSI-RS resource is a transmission resource reserved for a terminal device for sending a CSI-RS.

20. The terminal device according to claim 19, characterized in that: The first time unit includes a first time slot that can be used to transmit a CSI-RS, the first time slot includes the first CSI-RS resource, and the first time slot satisfies one or more of the following: The first time slot is only used for transmitting the CSI-RS; The first time slot is not used for transmitting a physical side control channel PSCCH; The first time slot is not used for transmitting second-order side control information SCI; The first time slot is not used for transmitting a physical sidelink shared channel PSSCH.

21. The terminal device according to claim 19 or 20, characterized in that: The first time unit includes a first time slot that can be used to transmit a CSI-RS, the first time slot includes the first CSI-RS resource, and a first time domain resource in the first time slot that can be used to transmit the CSI-RS satisfies one or more of the following: The starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot; The starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the second-order SCI in the first time slot; The starting position of the first time domain resource is determined based on a second time domain symbol that can be used for sideline transmission in the first time slot; The starting position of the first time domain resource is determined based on the second time domain symbol in the first time slot; and The end position of the first time domain resource is determined based on a guard symbol in the first time slot.

22. The terminal device according to claim 21, characterized in that: If the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the PSCCH in the first time slot, The first time domain resource starts from a starting position corresponding to the time domain resource that can be used to transmit the PSCCH; or The starting position of the first time domain resource is determined according to the first time domain symbol after the time domain resource that can be used to transmit the PSCCH.

23. The terminal device according to claim 21, characterized in that: If the starting position of the first time domain resource is determined based on the time domain resource that can be used to transmit the second-order SCI in the first time slot, The starting position of the first time domain resource is determined according to the first time domain symbol after the time domain resource that can be used to transmit the second-order SCI.

24. The terminal device according to any one of claims 20 to 23, characterized in that: The first time unit includes a plurality of time slots, and the first time slot is a time slot other than the first time slot among the plurality of time slots; or, The first time unit is the first time slot.

25. The terminal device according to any one of claims 19 to 24, characterized in that: The first time unit includes a plurality of time slots, and a guard symbol of a previous time slot in adjacent time slots among the plurality of time slots is used to transmit a CSI-RS.

26. The terminal device according to any one of claims 19 to 25, characterized in that: The terminal device further includes: A communication unit is used to receive or send first indication information, where the first indication information is used to indicate the first CSI-RS resource.

27. The terminal device according to claim 26, characterized in that: The first indication information is used to indicate one or more of the following: A time domain position of the first CSI-RS resource in the first time unit; the number of CSI-RS resources included in the first time unit; the number of time domain symbols included in the first CSI-RS resource; CSI-RS resource information corresponding to the first CSI-RS resource.

28. The terminal device according to claim 26 or 27, characterized in that: The first indication information is carried by one or more of the following information: SCI, media access control element MAC CE and PC5-radio resource control PC5-RRC signaling.

29. The terminal device according to any one of claims 26 to 28, characterized in that: The first time unit includes a plurality of time slots, and the first indication information is transmitted by the first time unit; or, The first time unit includes a time slot, the first time unit is a second time slot, and the first indication information is transmitted by a third time slot whose time domain position is earlier than the second time slot.

30. The terminal device according to claim 29, characterized in that: The time interval between the time domain resource of the first indication information and the first CSI-RS resource is greater than or equal to a first threshold.

31. The terminal device according to claim 29, characterized in that: If the first indication information is transmitted by the third time slot, the time interval between the second time slot and the third time slot is greater than or equal to a first threshold.

32. The terminal device according to claim 31, characterized in that: The time interval between the second time slot and the third time slot is determined based on the time interval between the start time domain position of the second time slot and a first moment, where the first moment includes one of the following: The starting time of the third time slot; The end time of the third time slot; a starting time of a time domain resource of the first indication information transmitted in the third time slot; an end time of the time domain resource of the first indication information transmitted in the third time slot; The starting time of the time domain resources of the PSCCH in the third time slot; The end time of the time domain resources of the PSCCH in the third time slot; The starting time of the second-order SCI in the third time slot; The end time of the second-order SCI in the third time slot.

33. The terminal device according to any one of claims 30 to 32, characterized in that: The first threshold is determined based on one or more of the following: Pre-configuration information; Predefined information; Network device configuration information; Parameter timeDurationForQCL; Parameter sl-timeDurationForQCL; Terminal capabilities of terminal devices receiving the CSI-RS; and Indication information sent by the terminal device receiving CSI-RS.

34. The terminal device according to any one of claims 30 to 33, characterized in that: The first threshold is carried by one or more of the following information: SCI, MAC CE and PC5-RRC.

35. The terminal device according to any one of claims 19 to 34, characterized in that: The sidelink resource preemption enabling parameter corresponding to the first CSI-RS resource has the highest priority; and / or The sideline priority of the first CSI-RS resource is the highest priority.

36. The terminal device according to any one of claims 19 to 35, characterized in that: The plurality of consecutive time slots include one or more of the following: Multiple consecutive physical time slots; A plurality of consecutive time slots available for sideline transmission; Multiple consecutive time slots in a resource pool.

37. A terminal device, characterized in that: The terminal comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals, so that the terminal executes the method as described in any one of claims 1 to 18.

38. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 18.

39. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes the method according to any one of claims 1 to 18.

40. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 18.

41. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 18.

42. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 18.

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