Lateral communication method and device, equipment and storage medium

Abstract

The invention discloses a sidewalk communication method and device, equipment and a storage medium, and relates to the technical field of communication. The method comprises: a second terminal sending CSI-RS resource indication information to a first terminal (1310); and the first terminal sending first indication information to the second terminal, the first indication information being carried by a first channel or a first signaling, the first indication information or the first channel or the first signaling being used by the second terminal to determine whether the first terminal successfully receives CSI-RS resource indication information (1320). For a scene in which an airspace transmission filter (or wave beam) is adopted for transmission in a sidewalk communication system, the method ensures that the second terminal (receiving end) can know whether the reported CSI-RS resource indication information is successfully received by the first terminal (sending end); and thus, the first terminal can be ensured to subsequently perform transmission by adopting the sending beam determined according to the CSI-RS resource indication information, and the communication reliability is improved.

Description

Sideline communication method, device, equipment and storage medium Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a sideline communication method, apparatus, device, and storage medium. Background Art

[0002] In a sidelink (SL) communication system, when data is transmitted between terminal devices using beams, the currently selected beam may fail to meet communication requirements due to factors such as device movement or obstruction of the communication link. This is known as beam failure. When a beam failure occurs, the receiver reports a beam failure indication to the transmitter, along with information about the newly selected beam. This newly selected beam information is referred to as the CSI-RS (Channel State Information-Reference Signal) resource indication.

[0003] After the receiving end reports the CSI-RS resource indication information to the transmitting end, how the receiving end knows whether the transmitting end has successfully received the CSI-RS resource indication information still needs further research and discussion.

[0004] Summary of the Invention

[0005] The present invention provides a sideline communication method, apparatus, device, and storage medium. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a sideline communication method is provided, the method comprising:

[0007] The first terminal receives CSI-RS resource indication information sent by the second terminal;

[0008] The first terminal sends first indication information to the second terminal, where the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0009] According to one aspect of an embodiment of the present application, a sideline communication method is provided, the method comprising:

[0010] The second terminal sends CSI-RS resource indication information to the first terminal;

[0011] The second terminal receives first indication information sent by the first terminal, where the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0012] According to one aspect of an embodiment of the present application, a sideline communication device is provided, the device comprising:

[0013] A receiving module, configured to receive CSI-RS resource indication information sent by a second terminal;

[0014] A sending module is used to send first indication information to the second terminal, where the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0015] According to one aspect of an embodiment of the present application, a sideline communication device is provided, the device comprising:

[0016] A sending module, configured to send CSI-RS resource indication information to the first terminal;

[0017] A receiving module is used to receive first indication information sent by the first terminal, the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0018] According to one aspect of an embodiment of the present application, a terminal device is provided, comprising a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the above-mentioned sideline communication method.

[0019] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to be executed by a processor to implement the above-mentioned sideline communication method.

[0020] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions, and when the chip is running, is used to implement the above-mentioned side communication method.

[0021] According to one aspect of an embodiment of the present application, a computer program product is provided, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned side communication method.

[0022] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0023] For the scenario where a spatial transmission filter (or beam) is used for transmission in a side communication system, after the second terminal reports the CSI-RS resource indication information to the first terminal, the first indication information is sent to the second terminal through the first terminal, and the first indication information is carried through the first channel or the first signaling. The second terminal can determine whether the first terminal has successfully received the above-mentioned CSI-RS resource indication information based on the first indication information or the first channel or the first signaling, thereby ensuring that the second terminal (receiving end) can know whether the CSI-RS resource indication information it reported is successfully received by the first terminal (transmitting end), and further ensure that the first terminal can subsequently use the transmission beam determined according to the CSI-RS resource indication information for transmission, thereby improving the reliability of communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0025] FIG2 is a schematic diagram of network coverage inner line communication provided by one embodiment of the present application;

[0026] FIG3 is a schematic diagram of partial network coverage sideline communication provided by an embodiment of the present application;

[0027] FIG4 is a schematic diagram of network coverage outer line communication provided by an embodiment of the present application;

[0028] FIG5 is a schematic diagram of sideline communication with a central control node provided by one embodiment of the present application;

[0029] FIG6 is a schematic diagram of unicast transmission provided by an embodiment of the present application;

[0030] FIG7 is a schematic diagram of multicast transmission provided by an embodiment of the present application;

[0031] FIG8 is a schematic diagram of broadcast transmission provided by an embodiment of the present application;

[0032] FIG9 is a schematic diagram of a time slot structure in NR-V2X provided by an embodiment of the present application;

[0033] FIG10 is a schematic diagram of the time-frequency position of the SL CSI-RS provided by one embodiment of the present application;

[0034] FIG11 is a schematic diagram of a system that does not use analog beams and uses analog beams according to an embodiment of the present application;

[0035] FIG12 is a flowchart of a method for configuring the TCI state of a PDSCH provided by one embodiment of the present application;

[0036] FIG13 is a flow chart of a side communication method provided by one embodiment of the present application;

[0037] FIG14 is a schematic diagram of optimal beam selection provided by one embodiment of the present application;

[0038] FIG15 is a block diagram of a side communication device provided by one embodiment of the present application;

[0039] FIG16 is a block diagram of a side communication device provided by another embodiment of the present application;

[0040] FIG17 is a schematic structural diagram of a terminal device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0042] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0043] Please refer to Figure 1, which shows a schematic diagram of a network architecture provided by an embodiment of the present application. The network architecture may include: a core network 11, an access network 12, and a terminal device 13.

[0044] The core network 11 includes several core network devices. The functions of the core network devices are mainly to provide user connections, user management, and service carrying, and to provide an interface to the external network as a bearer network. For example, the core network of a 5G (5th Generation) NR (New Radio) system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity.

[0045] The access network 12 includes several access network devices 14. The access network in the 5G NR system can be called NG-RAN (New Generation-Radio Access Network). The access network device 14 is a device deployed in the access network 12 to provide wireless communication functions for the terminal device 13. The access network device 14 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, they are called gNodeB or gNB. With the evolution of communication technology, the name of "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 13 are collectively referred to as access network devices.

[0046] The number of terminal devices 13 is usually multiple, and one or more terminal devices 13 can be distributed in the cell managed by each access network device 14. The terminal device 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile stations (MS), etc. For the convenience of description, the devices mentioned above are collectively referred to as terminal devices. The access network device 14 and the core network device communicate with each other through some air technology, such as the NG interface in the 5G NR system. The access network device 14 and the terminal device 13 communicate with each other through some air technology, such as the Uu interface. In this application, "terminal device" and "terminal" and "UE" are usually used interchangeably, but those skilled in the art can understand that they usually express the same meaning.

[0047] Terminal devices 13 and terminal devices 13 (for example, vehicle-mounted devices and other devices (such as other vehicle-mounted devices, mobile phones, RSU (Road Side Unit), etc.)) can communicate with each other through a direct communication interface (such as a PC5 interface). Accordingly, the communication link established based on the direct communication interface can be called a direct link or SL. SL transmission is the direct communication and data transmission between terminal devices through a side link. Unlike traditional cellular systems in which communication data is received or sent through access network equipment, SL transmission has the characteristics of short delay and low overhead, and is suitable for communication between two terminal devices that are geographically close (such as vehicle-mounted devices and other peripheral devices that are geographically close). It should be noted that in Figure 1, only vehicle-to-vehicle communication in the V2X (vehicle to everything) scenario is used as an example. SL technology can be applied to scenarios where direct communication is carried out between various terminal devices. In other words, the terminal device in this application refers to any device that communicates using SL technology.

[0048] The "5G NR system" in the embodiments of this application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of this application can be applied to the 5G NR system and can also be applied to subsequent evolution systems of the 5G NR system.

[0049] Before introducing the technical solutions of this application, we first introduce and explain some of the background technologies involved in this application. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0050] 1. Sideline communication in different network coverage environments

[0051] In sideline communication, according to the network coverage of the communicating terminal equipment, it can be divided into sideline communication within the network coverage, sideline communication with partial network coverage, and sideline communication outside the network coverage.

[0052] For sideline communications within network coverage, as shown in Figure 2, all terminal devices performing sideline communications are within the coverage of the same access network device (such as a base station). Therefore, the above-mentioned terminal devices can all perform sideline communications based on the same sideline configuration by receiving configuration signaling from the access network device.

[0053] For sidelink communications with partial network coverage, as shown in Figure 3, some terminal devices performing sidelink communications are located within the coverage of the access network device (such as a base station). These terminal devices can receive the configuration signaling of the access network device and perform sidelink communications according to the configuration of the access network device. However, terminal devices located outside the network coverage cannot receive the configuration signaling of the access network device. In this case, the terminal devices outside the network coverage will determine the sidelink configuration based on the pre-configuration information and the information carried in the PSBCH (Physical Sidelink Broadcast Channel) sent by the terminal devices within the network coverage, and perform sidelink communications.

[0054] For sideline communications outside the network coverage, as shown in FIG4 , all terminal devices performing sideline communications are located outside the network coverage, and all terminal devices determine the sideline configuration according to pre-configured information to perform sideline communications.

[0055] For sideline communication with a central control node, as shown in Figure 5, multiple terminal devices (such as UE1, UE2, UE3) constitute a communication group, which has a central control node (such as UE1), also known as CH UE (Cluster Header UE). The central control node (such as UE1) has at least one of the following functions: responsible for establishing the communication group; joining / leaving group members; coordinating resources, allocating sideline transmission resources to other terminals, receiving sideline feedback information from other terminals; coordinating resources with other communication groups, etc.

[0056] 2. D2D / V2X

[0057] Unlike traditional cellular systems, where communication data is received or sent via access network devices (such as base stations), device-to-device communication (D2D) is a sidelink transmission technology based on Direct-to-Device (D2D), resulting in higher spectrum efficiency and lower transmission latency. The Internet of Vehicles (IoV) system utilizes direct device-to-device communication. The 3rd Generation Partnership Project (3GPP) defines two transmission modes: Mode 1 and Mode 2.

[0058] Mode 1: The access network allocates transmission resources to the terminal device. The terminal device transmits communication data on the sidelink based on the allocated transmission resources. The access network can allocate transmission resources for either single transmissions or semi-static transmissions. As shown in Figure 2, the terminal device is within the network coverage area and the access network allocates transmission resources for sidelink transmissions.

[0059] Second mode: The terminal device independently selects transmission resources from the resource pool to transmit communication data. Specifically, the terminal device can select transmission resources from the resource pool by listening or by random selection. As shown in Figure 4, if the terminal device is outside the network coverage area, the terminal device independently selects transmission resources from the pre-configured resource pool for sideways transmission; or as shown in Figure 2, if the terminal device is within the network coverage area, the terminal device independently selects transmission resources from the network-configured resource pool for sideways transmission.

[0060] The above-mentioned first mode is called mode 3 in the side communication system based on LTE and is called mode 1 in the side communication system based on NR; the above-mentioned second mode is called mode 4 in the side communication system based on LTE and is called mode 2 in the side communication system based on NR.

[0061] 3. NR-based sidelink communication system (NR Sidelink, NR SL)

[0062] In NR SL, terminal devices need to support autonomous driving functions, which puts higher requirements on data interaction between terminal devices, such as higher throughput, lower latency, higher reliability, larger coverage, and more flexible resource allocation.

[0063] NR SL supports unicast, multicast and broadcast transmission modes. For unicast transmission, there is only one terminal device at the receiving end. As shown in Figure 6, unicast transmission is performed between UE1 and UE2. For multicast transmission, the receiving end is all terminal devices in a communication group, or all terminal devices within a certain transmission distance. As shown in Figure 7, UE1, UE2, UE3 and UE4 constitute a communication group, in which UE1 sends data, and the other terminal devices UE2, UE3 and UE4 in the communication group are all receiving terminal devices. For broadcast transmission, the receiving end is any terminal device around the sending terminal device. As shown in Figure 8, UE1 is the sending terminal device, and the other terminal devices UE2-UE6 around it are all receiving terminal devices.

[0064] 4.NR SL system frame structure

[0065] The time slot structure in NR SL is shown in Figure 9. Sub-figure (a) of Figure 9 shows the time slot structure when the PSFCH (Physical Sidelink Feedback Channel) channel is not included in the time slot; sub-figure (b) of Figure 9 shows the time slot structure when the PSFCH channel is included.

[0066] The PSCCH (Pysical Sidelink Control Channel) in NR SL starts from the second sidelink symbol of the timeslot in the time domain, occupies 2 or 3 OFDM (Orthogonal Frequency Division Multiplexing) symbols, and can occupy {10, 12, 15, 20, 25} PRBs (Physical Resource Blocks) in the frequency domain. To reduce the complexity of UE blind detection of PSCCH, only one number of PSCCH symbols and PRBs is allowed to be configured in a resource pool. In addition, because the subchannel is the minimum granularity for PSSCH resource allocation in NR SL, the number of PRBs occupied by PSCCH must be less than or equal to the number of PRBs contained in a subchannel in the resource pool to avoid additional restrictions on PSSCH resource selection or allocation. The PSSCH also starts from the second sidelink symbol of the timeslot in the time domain. The last time domain symbol in the timeslot is the GP (Guard Period) symbol, and the remaining symbols are mapped to PSSCH. The first sidelink symbol in a timeslot is a repetition of the second sidelink symbol. The receiving terminal typically uses the first sidelink symbol as an AGC (Automatic Gain Control) symbol; the data on this symbol is not typically used for data demodulation. The PSSCH occupies K subchannels in the frequency domain, each consisting of N consecutive PRBs, as shown in subfigure (a) of Figure 9.

[0067] When a time slot contains a PSFCH channel, the second to last and third to last symbols in the time slot are used for PSFCH channel transmission, and a time domain symbol before the PSFCH channel is used as a GP symbol, as shown in sub-figure (b) of FIG9 .

[0068] 5. Side CSI-RS

[0069] To better support unicast communication, NR SL supports SL CSI-RS. SL CSI-RS is sent only when the following three conditions are met:

[0070] (1) The terminal device sends the corresponding PSSCH, that is, the terminal device cannot only send SL CSI-RS;

[0071] (2) Sidelink CSI reporting is activated by higher-layer signaling;

[0072] (3) When sidelink CSI reporting is activated by high-layer signaling, the corresponding bit in the second-order SCI sent by the terminal device triggers the sidelink CSI reporting.

[0073] The maximum number of ports supported by SL CSI-RS is 2. When there are two ports, the SL CSI-RSs of different ports are multiplexed by code division on two adjacent REs (Resource Element) of the same OFDM symbol. The number of SL CSI-RSs for each port in a PRB is 1, that is, the density is 1. Therefore, within a PRB, SL CSI-RS will appear in at most one OFDM symbol. The specific location of this OFDM symbol is determined by the transmitting terminal. To avoid affecting the resource mapping of PSCCH and second-order SCI, SL CSI-RS cannot be located in the same OFDM symbol as PSCCH and second-order SCI. Since the channel estimation accuracy of the OFDM symbol where the PSSCH DMRS (Demodulation Reference Signal) is located is higher, and the SL CSI-RSs of the two ports will occupy two consecutive REs in the frequency domain, SL CSI-RS cannot be sent in the same OFDM symbol as the PSSCH DMRS. The position of the OFDM symbol where the SL CSI-RS is located is indicated by the sl-CSI-RS-FirstSymbol parameter in PC5 (ProSe Communication 5, the fifth neighbor communication interface) RRC (Radio Resource Control).

[0074] The position of the first RE occupied by the SL CSI-RS in a PRB is indicated by the sl-CSI-RS-FreqAllocation parameter in PC5RRC. If the SL CSI-RS is a single port, the parameter is a bitmap of length 12, corresponding to 12 REs in a PRB. If the SL CSI-RS is a dual port, the parameter is a bitmap of length 6. In this case, the SL CSI-RS occupies two REs, 2f(1) and 2f(1)+1, where f(1) represents the index of the bit with a value of 1 in the bitmap. The frequency domain position of the SL CSI-RS is also determined by the transmitting terminal, but the determined frequency domain position of the SL CSI-RS cannot conflict with the PT-RS (Phase Track Reference Signal). FIG10 shows a schematic diagram of the time-frequency position of the SL CSI-RS. In the diagram, the number of SL CSI-RS ports is 2, the sl-CSI-RS-FirstSymbol is 8, and the sl-CSI-RS-FreqAllocation is [b5, b4, b3, b2, b1, b0] = [0, 0, 0, 1, 0, 0].

[0075] 6. Multi-beam system

[0076] NR / 5G system design goals include wide-bandwidth communications in high-frequency bands (e.g., bands above 6 GHz). As the operating frequency increases, path loss increases during transmission, impacting the coverage capabilities of high-frequency systems. To effectively ensure high-band NR system coverage, an effective technical solution is to use massive antenna arrays (Massive MIMO) to form shaped beams with greater gain, overcome propagation loss, and ensure system coverage.

[0077] Millimeter-wave antenna arrays, due to their shorter wavelengths, smaller antenna array spacing, and smaller apertures, allow more physical antenna arrays to be integrated into a two-dimensional antenna array of limited size. At the same time, due to the limited size of millimeter-wave antenna arrays, digital beamforming cannot be used due to factors such as hardware complexity, cost, and power consumption. Instead, analog beamforming is typically used, which enhances network coverage while reducing device implementation complexity.

[0078] In typical existing 2G / 3G / 4G systems, a cell (sector) uses a wide beam to cover the entire cell. Therefore, at every moment, UEs within the cell's coverage area have the opportunity to obtain transmission resources allocated by the system.

[0079] The NR / 5G Multi-beam system uses different beams to cover the entire cell. That is, each beam covers a smaller area, and the effect of multiple beams covering the entire cell is achieved through time sweeping.

[0080] Figure 11 shows schematic diagrams of systems without and with beamforming. The left sub-figure (a) shows the traditional LTE and NR systems without beamforming, and the right sub-figure (b) shows the NR system with beamforming.

[0081] In the left sub-figure (a), the LTE / NR network side uses a wide beam to cover the entire cell, and terminal devices 1-5 can receive network signals at any time.

[0082] In contrast, in the right sub-figure (b), the network side uses narrower beams (such as beams 1-4 in the figure), and uses different beams at different times to cover different areas in the cell. For example, at time 1, the NR network side uses beam 1 to cover the area where terminal device 1 is located; at time 2, the NR network side uses beam 2 to cover the area where terminal device 2 is located; at time 3, the NR network side uses beam 3 to cover the area where terminal devices 3 and 4 are located; and at time 4, the NR network side uses beam 4 to cover the area where terminal device 5 is located.

[0083] In the right sub-figure (b), because the network uses narrower beams, the transmission energy can be more concentrated, thus covering a longer distance. At the same time, because the beams are narrow, each beam can only cover a part of the cell, so analog beamforming is "trading time for space."

[0084] 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).

[0085] Currently, different beams are identified by the different signals carried on them.

[0086] Different SSBs (Synchronization Signal Blocks) are transmitted on different beams, and terminal devices can distinguish different beams through different SSBs.

[0087] Different CSI-RS signals are transmitted on different beams, and the terminal device identifies different beams through the CSI-RS signals / CSI-RS resources.

[0088] Therefore, the following discussions are all based on visible signals (which actually correspond to one or some physical beams, but may not be explicitly stated in the standard).

[0089] In a multi-beam system, PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel) can be transmitted through different downlink transmit beams.

[0090] For systems below 6G, there is generally no analog beam on the UE side, so an omnidirectional antenna (or a nearly omnidirectional antenna) is used to receive signals sent by different downlink transmission beams of the base station.

[0091] In millimeter wave systems, the UE may have analog beams, requiring the corresponding downlink receive beam to receive the signal from the corresponding downlink transmit beam. In this case, beam indication information is required to assist the UE in determining the network's transmit beam information or the UE's corresponding receive beam information.

[0092] In the NR protocol, beam indication information does not directly indicate the beam itself, but rather indicates it through the QCL (Quasi Co-Location) between signals ('QCL-Type D' type). On the UE side, determining the corresponding channel / signal to receive is also based on the QCL assumption.

[0093] 7. Downlink QCL Indication / Assumption

[0094] To improve reception performance, terminal devices can leverage the characteristics of the transmission environment to improve their reception algorithms. For example, channel statistics can be used to optimize the design and parameters of the channel estimator. In NR systems, these characteristics of data transmission are represented by the QCL state (QCL-Info).

[0095] If the downlink transmission comes from different TRPs (Transmit Receive Points) / panels (antenna panels) / beams, the characteristics of the transmission environment corresponding to the data transmission may also change. Therefore, in the NR system, when the network side transmits the downlink control channel or data channel, it will indicate the corresponding QCL status information to the terminal device through the TCI (Transmission Configuration Indicator) status.

[0096] A TCI state can contain the following configurations:

[0097] TCI status ID, used to identify a TCI status;

[0098] QCL information 1;

[0099] QCL information 2 (optional).

[0100] Among them, a QCL information contains the following information:

[0101] QCL type configuration, which can be one of QCL type A, QCL type B, QCL type C, or QCL type D;

[0102] QCL reference signal configuration, including the cell ID where the reference signal is located, the BWP (Bandwidth Part) ID, and the reference signal identifier (which can be the CSI-RS resource ID or SSB index);

[0103] Among them, if QCL information 1 and QCL information 2 are both configured, the QCL type of at least one QCL information must be one of TypeA, TypeB, and TypeC, and the QCL type of the other QCL information (if configured) must be QCL type D.

[0104] The definitions of different QCL type configurations are as follows:

[0105] ·'QCL-TypeA':{Doppler shift,Doppler spread,average delay,delay spread};

[0106] ·'QCL-TypeB':{Doppler shift,Doppler spread};

[0107] ·'QCL-TypeC':{Doppler shift,average delay};

[0108] ·'QCL-TypeD':{Spatial Rx parameter}.

[0109] In the NR system, the network side can indicate the corresponding TCI status for the downlink signal or downlink channel.

[0110] If the network side configures the QCL reference signal of the target downlink channel or target downlink signal as a reference SSB or reference CSI-RS resource through the TCI state, and the QCL type is configured as typeA, typeB or typeC, the terminal device can assume that the large-scale parameters of the target downlink signal and the reference SSB or reference CSI-RS resource are the same, and the large-scale parameters are determined by the QCL type configuration.

[0111] Similarly, if the network side configures the QCL reference signal of the target downlink channel or downlink signal as a reference SSB or reference CSI-RS resource through the TCI state, and the QCL type is configured as TypeD, the terminal device can use the same receiving beam (i.e., Spatial Rx parameter) as that for receiving the reference SSB or reference CSI-RS resource to receive the target downlink signal. Usually, the target downlink channel (or downlink signal) and its reference SSB or reference CSI-RS resource are sent by the same TRP or the same panel or the same beam on the network side. If the transmission TRP or transmission panel or transmission beam of two downlink signals or downlink channels is different, different TCI states are usually configured.

[0112] For the downlink control channel, the TCI status of the corresponding CORESET (Control Resource Set) may be indicated by RRC signaling or RRC signaling + MAC (Media Access Control) signaling.

[0113] For the downlink data channel, as shown in Figure 12, the available TCI state set is indicated by RRC signaling, and some of the TCI states are activated by MAC signaling. Finally, the TCI state indication field in the DCI (Downlink Control Information) indicates one or two TCI states from the activated TCI states for the PDSCH scheduled by the DCI. The case of two TCI states is mainly for the scenario similar to multiple TRPs discussed later.

[0114] In order to improve the transmission rate of the sideline communication system, the use of millimeter wave frequency bands in the sideline transmission system is considered. In the sideline millimeter wave transmission system, a beam-based transmission method is usually adopted. The transmitter uses a transmit beam to send data, and the receiver uses a receive beam to receive. However, due to reasons such as the movement of the terminal device or the presence of objects blocking the communication link, it is possible that the currently selected beam cannot meet the communication requirements, that is, beam failure occurs. When beam failure occurs, the receiver reports beam failure indication information and newly selected beam information, that is, CSI-RS resource indication information, to the transmitter. The receiver needs to know whether the transmitter has successfully received the CSI-RS resource indication information. Only when the transmitter successfully receives the CSI-RS resource indication information can it use its corresponding transmit beam for subsequent data transmission.

[0115] The method provided in this application is not limited to the scenario of beam failure, but is also applicable to other scenarios where the receiving end reports CSI-RS resource indication information to the transmitting end.

[0116] It should be noted that in this application, the "beam" mentioned is also called the "spatial domain transmission filter", and the two express the same meaning. Correspondingly, the "receive beam" is also called the "spatial domain receive filter", "receiving end spatial domain filter", "spatial domain transmission filter for receiving" or other names, and the "transmit beam" is also called the "spatial domain transmit filter", "transmitting end spatial domain filter", "spatial domain transmission filter for sending" or other names, which are not limited in this application.

[0117] In addition, in this application, a "time unit" can be a time slot, a subframe, or other time units, and this application does not limit this. For the "time unit" mentioned elsewhere in this article, please refer to this explanation and will not be repeated.

[0118] In addition, in this application, "a certain information is carried in a certain signaling" can be understood as "the signaling carries the information." For example, "the first indication information mentioned below is carried by the first signaling" can be understood as "the first indication information is carried in the first signaling."

[0119] Please refer to Figure 13, which shows a flow chart of a sideline communication method provided by an embodiment of the present application. The method can be applied to the network architecture shown in Figure 1. The method may include at least one of the following steps 1310 to 1320:

[0120] Step 1310: The second terminal sends CSI-RS resource indication information to the first terminal.

[0121] Correspondingly, the first terminal receives the CSI-RS resource indication information sent by the second terminal.

[0122] Step 1320: The first terminal sends first indication information to the second terminal. The first indication information is carried via a first channel or a first signaling. The first indication information, the first channel, or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0123] Correspondingly, the second terminal receives the first indication information sent by the first terminal.

[0124] In some embodiments, the CSI-RS resource indication information is used to indicate the CSI-RS resource. Upon successfully receiving the CSI-RS resource indication information, the first terminal may determine a spatial domain transmit filter associated with the CSI-RS resource (referred to as a "first spatial domain transmit filter" in this embodiment of the present application) based on the CSI-RS resource indicated by the CSI-RS resource indication information, and subsequently use the determined spatial domain transmit filter (i.e., the first spatial domain transmit filter) to transmit to the second terminal.

[0125] Exemplarily, when the first terminal and the second terminal use a beam for data transmission, and the second terminal detects that a beam failure occurs, it sends beam failure indication information to the first terminal. The first terminal obtains the beam failure indication information reported by the second terminal and can execute or trigger a new beam selection process. The second terminal reports CSI-RS resource indication information to the first terminal. The transmission beam associated with the CSI-RS resource indicated by the CSI-RS resource indication information is the preferred transmission beam, and the first terminal uses the newly selected transmission beam for data transmission. In another possible implementation method, when the second terminal reports the beam failure indication information, it also reports the CSI-RS resource indication information to indicate the newly selected transmission beam. The first terminal can directly use the transmission beam for data transmission. In the above two methods, it should be ensured that the first terminal can obtain the reported CSI-RS resource indication information, so that it can use the CSI-RS resource indication information to determine the newly selected transmission beam for subsequent data transmission. Of course, the method provided in the present application is not limited to the scenario of beam failure, but is also applicable to other scenarios where the receiving end reports CSI-RS resource indication information to the transmitting end.

[0126] In some embodiments, the first terminal uses a first spatial domain transmission filter to send a first channel or a first signaling, and the first spatial domain transmission filter is a spatial domain transmission filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information. In some embodiments, the first spatial domain transmission filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship. That is, the QCL-TypeD introduced above. Alternatively, the first spatial domain transmission filter is the same as the spatial domain transmission filter used when the first terminal sends the CSI-RS resource indicated by the CSI-RS resource indication information, or is in a type D quasi-co-site relationship. That is, the QCL-TypeD introduced above.

[0127] In some embodiments, the second terminal receives the first channel or the first signaling using a first spatial domain reception filter, and the first spatial domain reception filter is a spatial domain reception filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information. In some embodiments, the first spatial domain reception filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship. That is, the QCL-TypeD introduced above. Alternatively, the first spatial domain reception filter is the same as the spatial domain reception filter used by the second terminal to receive the CSI-RS resource indicated by the CSI-RS resource indication information, or is in a type D quasi-co-site relationship. That is, the QCL-TypeD introduced above.

[0128] Exemplarily, when the first terminal successfully receives the CSI-RS resource indication information, it can determine the spatial domain transmission filter associated with the CSI-RS resource (i.e., the first spatial domain transmission filter) based on the CSI-RS resource indicated by the CSI-RS resource indication information, and then use the first spatial domain transmission filter to send the first channel or the first signaling to the second terminal; wherein the first channel or the first signaling can carry the first indication information. The second terminal can use the spatial domain reception filter associated with the CSI-RS resource (i.e., the first spatial domain reception filter) to receive the first channel or the first signaling. Furthermore, the second terminal can determine whether the first terminal has successfully received the CSI-RS resource indication information based on the first indication information or the first channel or the first signaling.

[0129] Exemplarily, when the first terminal successfully receives the CSI-RS resource indication information, it can determine the transmit beam associated with the CSI-RS resource (referred to as the first transmit beam) based on the CSI-RS resource indicated by the CSI-RS resource indication information, and then use the first transmit beam to send the first channel or the first signaling to the second terminal; wherein the first channel or the first signaling can carry the first indication information. The second terminal can use the receive beam associated with the CSI-RS resource (referred to as the first receive beam) to receive the first channel or the first signaling. Furthermore, the second terminal can determine whether the first terminal has successfully received the CSI-RS resource indication information based on the first indication information or the first channel or the first signaling.

[0130] In some embodiments, the first terminal determines the first spatial domain transmit filter based on the CSI-RS resource indication information. Exemplarily, the first terminal determines the spatial domain transmit filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information as the first spatial domain transmit filter.

[0131] In some embodiments, the process of the first terminal determining the first spatial domain transmission filter can be as follows: the first terminal uses different spatial domain transmission filters to send CSI-RS in turn, and the second terminal uses the same spatial domain reception filter to respectively receive multiple CSI-RS sent by the first terminal, and measures the detected CSI-RS, selects the CSI-RS with the best measurement result, and reports its corresponding resource information (such as CSI-RS resource index) to the first terminal. The spatial domain transmission filter corresponding to the CSI-RS resource is the optimal spatial domain transmission filter for the second terminal, that is, the above-mentioned first spatial domain transmission filter, and the spatial domain reception filter used by the second terminal is the optimal spatial domain reception filter corresponding to the first spatial domain transmission filter, that is, the above-mentioned first spatial domain reception filter. When the first terminal uses the first spatial domain transmission filter to send data, the second terminal should use the first spatial domain reception filter to receive data.

[0132] For example, as shown in Figure 14, the first terminal uses different transmission beams to send 4 CSI-RSs in time slot a, time slot b, time slot c and time slot d respectively, and the second terminal uses the same receiving beam 1 to receive the 4 CSI-RSs. If the second terminal detects that the measurement result of CSI-RS#2 is the largest, the resource index information of CSI-RS#2 is reported to the first terminal. Then, the transmission beam C corresponding to the CSI-RS#2 is the optimal transmission beam, that is, the above-mentioned first transmission beam, and the receiving beam 1 corresponding to the CSI-RS#2 is the optimal receiving beam, that is, the above-mentioned first receiving beam.

[0133] In addition, the above measurement results may be parameters used to characterize signal quality, such as RSSI (Received Signal Strength Indicator), RSRP (Reference Signal Receiving Power), RSRQ (Reference Signal Receiving Quality), and SINR (Signal to Interference plus Noise Ratio), which are not limited in this application.

[0134] In some embodiments, the first channel or the first signaling includes a first PSFCH. The first PSFCH can be understood as a PSFCH that carries the above-mentioned first indication information. The second terminal sends CSI-RS resource indication information to the first terminal and activates side feedback. The first terminal can send a first PSFCH to the second terminal, and the first PSFCH carries the first indication information. Optionally, the first terminal uses a first spatial domain transmit filter to send the above-mentioned first PSFCH. Accordingly, the second terminal uses a first spatial domain receive filter to receive the above-mentioned first PSFCH.

[0135] In some embodiments, sideways feedback may be activated as follows.

[0136] Exemplarily, when CSI-RS resource indication information is carried by a first SCI, the first SCI indicates activation of sideline feedback. The first SCI can be understood as an SCI that carries CSI-RS resource indication information. For example, the "HARQ feedback enabled / disabled indicator" information field in the first SCI indicates activation of sideline feedback. If the value of this information field is 1, it indicates activation of sideline feedback.

[0137] Exemplarily, when CSI-RS resource indication information is carried by a first MAC CE, a second SCI transmitted simultaneously with the first MAC CE indicates activation of sidelink feedback. The first MAC CE can be understood as a MAC CE that carries CSI-RS resource indication information. The second SCI refers to the SCI transmitted simultaneously with the first MAC CE. For example, the "HARQ feedback enabled / disabled indicator" information field in the second SCI transmitted simultaneously with the first MAC CE indicates activation of sidelink feedback. If the value of this information field is 1, it indicates activation of sidelink feedback.

[0138] In some embodiments, the time unit in which the first PSFCH is located is determined based on the time unit in which the CSI-RS resource indication information is located. For example, the CSI-RS resource indication information may be carried by the first SCI or the first MAC CE described above, and the time unit in which the first PSFCH is located may be determined based on the time unit in which the first SCI or the first MAC CE is located.

[0139] In some embodiments, the time unit where the first PSFCH is located is the first available time unit after time unit n+k; or, the time unit where the first PSFCH is located is the first available time unit no earlier than time unit n+k; wherein, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including the PSFCH resource, and n and k are both positive integers.

[0140] Exemplarily, CSI-RS resource indication information is carried by a first SCI or a first MAC CE, and the first SCI or the first MAC CE is located in time slot n. The time interval between a PSFCH and its associated PSSCH is determined to be k time slots based on configuration information. Then, the time slot of the first PSFCH is located in the first available time slot after time slot n+k, or the time slot of the first PSFCH is located in the first available time slot not earlier than time slot n+k; wherein, the available time slot can be represented as a time slot located in a resource pool and including PSFCH resources. When a first terminal receives CSI-RS resource indication information reported by a second terminal through a first SCI or a first MAC CE in time slot n, and sidelink feedback is activated, the first terminal transmits the first PSFCH using a first spatial domain transmit filter in the first PSFCH time slot including PSFCH transmission resources after time slot n+k, and the second terminal receives the first PSFCH using a first spatial domain receive filter.

[0141] In some embodiments, the first channel or the first signaling includes a third SCI or a first PSSCH.

[0142] The third SCI can be understood as an SCI that carries the first indication information. The second terminal sends CSI-RS resource indication information to the first terminal, and the first terminal can send a third SCI to the second terminal, where the third SCI carries the first indication information. Optionally, the first terminal uses the first spatial domain transmit filter to send the third SCI. Correspondingly, the second terminal uses the first spatial domain receive filter to receive the third SCI.

[0143] Optionally, source identification (Source ID) information in the third SCI is determined according to the layer 2 ID of the first terminal, and destination identification (Destination ID) information in the third SCI is determined according to the layer 2 ID of the second terminal.

[0144] The first PSSCH can be understood as the PSSCH that carries the first indication information. The second terminal sends CSI-RS resource indication information to the first terminal, and the first terminal can send a first PSSCH to the second terminal, where the first PSSCH carries the first indication information. Optionally, the first terminal uses a first spatial domain transmit filter to send the first PSSCH. Correspondingly, the second terminal uses a first spatial domain receive filter to receive the first PSSCH.

[0145] Optionally, when the first channel or the first signaling is a first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH. The second MAC CE can be understood as a MAC CE that carries the first indication information. The second terminal sends CSI-RS resource indication information to the first terminal, and the first terminal can send a first PSSCH to the second terminal, the first PSSCH carrying the second MAC CE, and the second MAC CE carrying the first indication information.

[0146] In some embodiments, the signaling or channel carrying CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, or a second PSFCH. The first SCI can be understood as an SCI carrying CSI-RS resource indication information. The first MAC CE can be understood as a MAC CE carrying CSI-RS resource indication information. The second PSFCH can be understood as a PSFCH carrying CSI-RS resource indication information.

[0147] Exemplarily, the first terminal receives CSI-RS resource indication information reported by the second terminal, and the CSI-RS resource indication information is carried by the first SCI, the first MAC CE, or the second PSFCH. The first terminal uses the first spatial domain transmit filter associated with the CSI-RS resource to send the third SCI or the first PSSCH. Correspondingly, the second terminal uses the first spatial domain receive filter associated with the CSI-RS resource to receive the third SCI or the first PSSCH. The third SCI or the first PSSCH carries the first indication information.

[0148] In some embodiments, the time unit in which the third SCI or the first PSSCH is located is determined based on the time unit in which the CSI-RS resource indication information is located. For example, the CSI-RS resource indication information may be carried by the first SCI, the first MAC CE, or the second PSFCH described above, and the time unit in which the third SCI or the first PSSCH is located may be determined based on the time unit in which the first SCI, the first MAC CE, or the second PSFCH is located.

[0149] In some embodiments, the first terminal determines the side transmission resources for transmitting the third SCI or the first PSSCH within a first time range. The above-mentioned first time range may also be referred to as a selection window or a resource selection window. Optionally, the starting position of the first time range is determined according to the time unit where the CSI-RS resource indication information is located, and the end position of the first time range or the duration of the first time range is determined according to any one of the following: protocol predefined information, pre-configuration information, network configuration information, PC5-RRC signaling, indication information of the first terminal, indication information of the second terminal. Optionally, when the first terminal selects transmission resources in the resource pool by itself to transmit communication data (that is, the second mode introduced above), the first terminal determines the side transmission resources for transmitting the third SCI or the first PSSCH within the first time range.

[0150] For example, if the time slot where the first SCI, the first MAC CE or the second PSFCH is located is n, the starting position of the first time range is time slot n+T1, where T1 is an integer greater than or equal to 0. In some embodiments, T1=1, 4, 6, 11 or 21 time slots, and the value of T1 is determined according to pre-configuration information, network configuration information, PC5-RRC signaling, indication information of the first terminal or indication information of the second terminal; the value of T1 is related to the side subcarrier spacing; in some embodiments, the value of T1 is determined according to and The sum is determined; for example, in, The value of is determined according to Table 1. The value of is determined according to Table 2; the parameter μ SL Determined according to the subcarrier spacing, as shown in Table 3.

[0151] Table 1

[0152] Table 2

[0153] Table 3

[0154] For example, the second terminal sends a second indication message to the first terminal, and the second indication message is used to indicate a latency boundary, and the duration corresponding to the first time range can be determined according to the latency boundary; or, the end position of the first time range can be determined according to the starting position of the first time range and the latency boundary; the first terminal determines the timer duration according to the duration corresponding to the latency boundary, and before the timer times out or expires, the first terminal sends the first indication message to the second terminal; the sideline transmission resource selected by the first terminal for transmitting the third SCI or the first PSSCH is located before the timer expires. The second terminal receives the third SCI or the first PSSCH using the first spatial domain receiving filter, and accordingly, the first terminal sends the third SCI or the first PSSCH using the first spatial domain sending filter. The time when the first terminal starts or restarts the timer is determined according to the time when the CSI-RS resource indication information reported by the second terminal is received.

[0155] In some embodiments, the value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal did not successfully receive the CSI-RS resource indication information. The first value and the second value are two different values, thereby achieving a distinction between successful reception and unsuccessful reception. Exemplarily, the first value is 1 and the second value is 0.

[0156] Accordingly, when the second terminal successfully receives the first indication information and the first indication information is the first value, the second terminal determines that the first terminal has successfully received the CSI-RS resource indication information; or, when the second terminal successfully receives the first indication information and the first indication information is the second value, the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information.

[0157] In some embodiments, when the second terminal successfully receives the first channel or the first signaling, the second terminal determines that the first terminal successfully receives the CSI-RS resource indication information; or, when the second terminal does not receive the first channel or the first signaling, the second terminal determines that the first terminal does not successfully receive the CSI-RS resource indication information.

[0158] In some embodiments, if the second terminal does not receive the first channel or the first signaling, the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information; if the second terminal successfully receives the first channel or the first signaling, the second terminal determines whether the first terminal has successfully received the CSI-RS resource indication information based on the value of the first indication information carried in the first channel or the first signaling. If the first indication information is a first value, the second terminal determines that the first terminal has successfully received the CSI-RS resource indication information; if the first indication information is a second value, the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information.

[0159] In some embodiments, when the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information, the second terminal may resend the CSI-RS resource indication information to the first terminal.

[0160] Exemplarily, the first channel is the first PSFCH, and the second terminal can determine whether the first terminal has successfully received the CSI-RS resource information only based on whether the first PSFCH is detected, without having to determine whether the first terminal has successfully received the CSI-RS resource information based on the first indication information carried in the first PSFCH. In this case, the value of the first indication information carried in the first PSFCH can be a first value (such as 1) or a second value (such as 0). For example, the second terminal carries CSI-RS resource information through the first SCI. When the second terminal sends the first SCI, it will also send the second PSSCH at the same time; only when the first terminal successfully detects the first SCI can it send the first PSFCH, and at this time the first terminal has successfully received the CSI-RS resource indication information; therefore, the second terminal can determine whether the first terminal has successfully received the CSI-RS resource information based on whether the first PSFCH sent by the first terminal is detected; at this time, the first indication information carried in the first PSFCH can be HARQ (Hybrid Automatic Repeat reQuest) feedback information for the second PSSCH, which can be ACK (Acknowledgement, positive confirmation, that is, the above-mentioned first value) or NACK (Negative Acknowledgement, negative confirmation, that is, the above-mentioned second value).

[0161] Exemplarily, the first channel is the first PSFCH, and the second terminal can determine whether the first terminal has successfully received the CSI-RS resource information only based on whether the first PSFCH is detected, without having to determine whether the first terminal has successfully received the CSI-RS resource information based on the first indication information carried in the first PSFCH. At this time, the value of the first indication information carried in the first PSFCH may only include the first value (such as 1), or the value of the first indication information carried in the first PSFCH may only include the second value (such as 0). For example, the second terminal carries the CSI-RS resource information through the first MAC CE, and the second terminal indicates the activation of side feedback when sending the first MAC CE. The first terminal will only send the first PSFCH if it successfully detects the first MAC CE, and the value of the first indication information carried by the PSFCH is ACK, that is, the above-mentioned first value, otherwise the first terminal does not send PSFCH; therefore, the second terminal can determine whether the first terminal has successfully received the CSI-RS resource information based on whether the first PSFCH sent by the first terminal is detected.

[0162] Exemplarily, the first channel is the first PSFCH, and the value of the first indication information carried in the first PSFCH can be a first value (such as 1) or a second value (such as 0). Only when the second terminal successfully detects the first PSFCH and determines whether the first terminal has successfully received the CSI-RS resource information based on the value of the first indication information. For example, the second terminal carries the CSI-RS resource information through the first MAC CE. When the second terminal sends the first MAC CE, the side feedback is activated by the SCI indication sent simultaneously with the first MAC CE. The first terminal successfully detects the SCI and can determine that it needs to send the first PSFCH to the second terminal. If the first terminal successfully detects the first MAC CE, it sends ACK (i.e., the above-mentioned first value) through the first PSFCH; if the first terminal fails to successfully detect the first MAC CE, it sends NACK (i.e., the above-mentioned second value) through the first PSFCH. Therefore, the second terminal can determine whether the first terminal has successfully received the CSI-RS resource information based on whether the value of the first indication information carried in the first PSFCH sent by the first terminal is the first value or the second value.

[0163] Exemplarily, the SCI associated with the first PSSCH carries first indication information for indicating whether the first terminal has received the CSI-RS resource indication information. For example, the SCI associated with the first PSSCH may be the third SCI described above, and the first indication information is carried by the SCI associated with the first PSSCH. When the second terminal successfully detects the SCI associated with the first PSSCH, it can be determined whether the first terminal has received the CSI-RS resource indication information based on the first indication information. For example, when the first indication information is a first value, it is determined that the first terminal has received the CSI-RS resource indication information, or when the first indication information is a second value, it is determined that the first terminal has not received the CSI-RS resource indication information; otherwise, when the second terminal does not detect the SCI associated with the first PSSCH, it is deemed that the first terminal has not received the CSI-RS resource indication information. For example, the first value is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, for example, the first value is the identifier corresponding to the CSI-RS resource indicated by the CSI-RS resource indication information; or, the first value is a first transmission configuration indication state identifier (TCI state ID), and the reference signal identifier associated with the first transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, for example, the reference signal identifier associated with the first transmission configuration indication state identifier is the identifier corresponding to the CSI-RS resource indicated by the CSI-RS resource indication information.

[0164] Exemplarily, the SCI associated with the first PSSCH does not carry the first indication information for indicating whether the first terminal has received the CSI-RS resource indication information. When the second terminal successfully detects the SCI associated with the first PSSCH, it can be considered that the first terminal has received the CSI-RS resource indication information; otherwise, when the second terminal does not detect the SCI associated with the first PSSCH, it can be considered that the first terminal has not received the CSI-RS resource indication information.

[0165] In some embodiments, the first indication information indicates a first identifier, and the first identifier is used to indicate that the first terminal has successfully received the CSI-RS resource indication information. In some embodiments, the first identifier is determined based on the CSI-RS resource indicated by the CSI-RS resource indication information. For example, the first identifier is an identifier corresponding to the CSI-RS resource indicated by the CSI-RS resource indication information. In some embodiments, the first identifier is a second transmission configuration indication state identifier (TCI state ID). The reference signal identifier associated with the second transmission configuration indication state identifier is determined based on the CSI-RS resource indicated by the CSI-RS resource indication information. For example, the reference signal identifier associated with the second transmission configuration indication state identifier is an identifier corresponding to the CSI-RS resource indicated by the CSI-RS resource indication information.

[0166] Exemplarily, the MAC CE carried by the first PSSCH carries first indication information for indicating that the first terminal has received the CSI-RS resource indication information. For example, the MAC CE carried by the first PSSCH may be the second MAC CE described above, which carries the first indication information. Only when the second terminal successfully detects the first PSSCH, that is, the first PSSCH decoding is successful, can it be learned from the MAC CE carried by the first PSSCH that the first terminal has received the CSI-RS resource indication information; otherwise, when the second terminal does not detect the first PSSCH, or the first PSSCH decoding fails, it is considered that the first terminal has not received the CSI-RS resource indication information.

[0167] Exemplarily, the MAC CE carried by the first PSSCH does not carry the first indication information for indicating that the first terminal has received the CSI-RS resource indication information. When the second terminal successfully detects the first PSSCH, that is, the first PSSCH is successfully decoded, it can be considered that the first terminal has received the CSI-RS resource indication information; otherwise, when the second terminal does not detect the first PSSCH or the first PSSCH decoding fails, it is considered that the first terminal has not received the CSI-RS resource indication information.

[0168] In some embodiments, the second terminal sends beam failure indication information to the first terminal, where the beam failure indication information is used to indicate beam failure. Correspondingly, the first terminal receives the beam failure indication information sent by the second terminal.

[0169] In some embodiments, the second terminal transmits the beam failure indication information and the CSI-RS resource indication information in the same time unit. Correspondingly, the first terminal receives the beam failure indication information and the CSI-RS resource indication information in the same time unit. For example, the second terminal transmits the beam failure indication information and the CSI-RS resource indication information in the same time slot, and the first terminal receives the beam failure indication information and the CSI-RS resource indication information in the same time slot.

[0170] In some embodiments, the beam failure indication information and the CSI-RS resource indication information are carried in the same signaling. For example, the beam failure indication information and the CSI-RS resource indication information are carried in the same SCI (such as the first SCI described above). For another example, the beam failure indication information and the CSI-RS resource indication information are carried in the same MAC CE (such as the first MAC CE described above). For another example, the beam failure indication information and the CSI-RS resource indication information are carried in the same MAC CE (such as the first MAC CE described above), and in addition, the beam failure indication information is also carried in the SCI.

[0171] In some embodiments, the beam failure indication information and the CSI-RS resource indication information are carried in different signaling. For example, the beam failure indication information is carried by the SCI, and the CSI-RS resource indication information is carried by the MAC CE. For another example, the beam failure indication information and the CSI-RS resource indication information are carried by different SCIs or different MAC CEs.

[0172] The SCI mentioned in the embodiments of the present application may be a first-order SCI (carried by PSCCH) or a second-order SCI (carried by PSSCH).

[0173] The technical solution provided by the embodiment of the present application is for the scenario where a spatial transmission filter (or beam) is used for transmission in a side communication system. After the second terminal reports the CSI-RS resource indication information to the first terminal, the first indication information is sent to the second terminal through the first terminal, and the first indication information is carried through the first channel or the first signaling. The second terminal can determine whether the first terminal has successfully received the above-mentioned CSI-RS resource indication information based on the first indication information or the first channel or the first signaling, thereby ensuring that the second terminal (receiving end) can know whether the CSI-RS resource indication information it reported is successfully received by the first terminal (transmitting end), and further ensuring that the first terminal can subsequently use the transmission beam determined according to the CSI-RS resource indication information for transmission, thereby improving the reliability of communication.

[0174] In addition, in the above method embodiments, the steps performed by the first terminal can be independently implemented as a sideline communication method on the first terminal side; the steps performed by the second terminal can be independently implemented as a sideline communication method on the second terminal side. Any terminal device in the communication system can act as a transmitter to perform the steps performed by the first terminal, or as a receiver to perform the steps performed by the second terminal, or as both a transmitter and a receiver, and this application does not limit this.

[0175] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0176] Please refer to Figure 15, which shows a block diagram of a sideline communication device provided by one embodiment of the present application. This device has the function of implementing the above-mentioned sideline communication method on the first terminal side. This function can be implemented by hardware or by hardware executing corresponding software. This device can be the first terminal described above, or it can be provided in the first terminal. As shown in Figure 15, the device 1500 may include: a receiving module 1510 and a sending module 1520.

[0177] The receiving module 1510 is configured to receive CSI-RS resource indication information sent by the second terminal.

[0178] The sending module 1520 is used to send first indication information to the second terminal, where the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0179] In some embodiments, the first terminal transmits the first channel or the first signaling using a first spatial domain transmit filter, where the first spatial domain transmit filter is a spatial domain transmit filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

[0180] In some embodiments, the first spatial domain transmit filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi co-location relationship.

[0181] In some embodiments, as shown in FIG15 , the apparatus 1500 further includes a processing module 1530 configured to determine the first spatial domain transmit filter according to the CSI-RS resource indication information.

[0182] In some embodiments, the first channel or first signaling comprises a first PSFCH.

[0183] In some embodiments, when the CSI-RS resource indication information is carried by a first SCI, the first SCI indicates activation of side feedback; or, when the CSI-RS resource indication information is carried by a first MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates side feedback.

[0184] In some embodiments, the time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

[0185] In some embodiments, the time unit where the first PSFCH is located is the first available time unit after time unit n+k; or, the time unit where the first PSFCH is located is the first available time unit not earlier than time unit n+k; wherein, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including the PSFCH resource, and n and k are both positive integers.

[0186] In some embodiments, the first channel or the first signaling includes a third SCI or a first PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

[0187] In some embodiments, the signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, or a second PSFCH.

[0188] In some embodiments, the time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

[0189] In some embodiments, as shown in Figure 15, the device 1500 also includes a processing module 1530, which is used to determine the side transmission resources used to transmit the third SCI or the first PSSCH within a first time range; wherein the starting position of the first time range is determined according to the time unit where the CSI-RS resource indication information is located, and the end position of the first time range or the duration of the first time range is determined according to any one of the following: protocol predefined information, pre-configuration information, network configuration information, PC5-RRC signaling, indication information of the first terminal, and indication information of the second terminal.

[0190] In some embodiments, the value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal did not successfully receive the CSI-RS resource indication information.

[0191] In some embodiments, the first indication information indicates a first identifier; wherein the first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

[0192] In some embodiments, the receiving module 1510 is further configured to receive beam failure indication information sent by the second terminal.

[0193] In some embodiments, the first terminal receives the beam failure indication information and the CSI-RS resource indication information in the same time unit.

[0194] In some embodiments, the beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, the beam failure indication information and the CSI-RS resource indication information are carried in different signaling.

[0195] Please refer to Figure 16, which shows a block diagram of a sideline communication device provided in another embodiment of the present application. This device has the function of implementing the above-mentioned sideline communication method on the second terminal side. This function can be implemented in hardware or by hardware executing corresponding software. This device can be the second terminal described above, or it can be provided in the second terminal. As shown in Figure 16, the device 1600 may include a sending module 1610 and a receiving module 1620.

[0196] The sending module 1610 is configured to send CSI-RS resource indication information to the first terminal.

[0197] The receiving module 1620 is used to receive the first indication information sent by the first terminal, and the first indication information is carried through the first channel or the first signaling. The first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0198] In some embodiments, the second terminal receives the first channel or the first signaling using a first spatial domain reception filter, where the first spatial domain reception filter is a spatial domain reception filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

[0199] In some embodiments, the first terminal uses a first spatial domain transmission filter to send the first channel or first signaling, and the first spatial domain transmission filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship.

[0200] In some embodiments, the first channel or first signaling comprises a first PSFCH.

[0201] In some embodiments, when the CSI-RS resource indication information is carried by a first SCI, the first SCI indicates activation of side feedback; or, when the CSI-RS resource indication information is carried by a first MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates side feedback.

[0202] In some embodiments, the time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

[0203] In some embodiments, the time unit where the first PSFCH is located is the first available time unit after time unit n+k; or, the time unit where the first PSFCH is located is no earlier than the first available time unit after time unit n+k; wherein, time unit n is the time unit where the CSI-RS resource indication information is located, and the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including the PSFCH resource, and n and k are both positive integers.

[0204] In some embodiments, the first channel or the first signaling includes a third SCI or a first PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

[0205] In some embodiments, the signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, or a second PSFCH.

[0206] In some embodiments, the time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

[0207] In some embodiments, the value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal did not successfully receive the CSI-RS resource indication information.

[0208] In some embodiments, as shown in Figure 16, the device 1600 also includes a processing module 1630, which is used to: when the second terminal successfully receives the first indication information and the first indication information is the first value, determine that the first terminal has successfully received the CSI-RS resource indication information; or, when the second terminal successfully receives the first indication information and the first indication information is the second value, determine that the first terminal has not successfully received the CSI-RS resource indication information.

[0209] In some embodiments, the first indication information indicates a first identifier; wherein the first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

[0210] In some embodiments, as shown in Figure 16, the device 1600 also includes a processing module 1630, which is used to: determine that the first terminal has successfully received the CSI-RS resource indication information when the second terminal successfully receives the first channel or the first signaling; or determine that the first terminal has not successfully received the CSI-RS resource indication information when the second terminal has not received the first channel or the first signaling.

[0211] In some embodiments, the sending module 1610 is further configured to send beam failure indication information to the first terminal.

[0212] In some embodiments, the second terminal sends the beam failure indication information and the CSI-RS resource indication information in the same time unit.

[0213] In some embodiments, the beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, the beam failure indication information and the CSI-RS resource indication information are carried in different signaling.

[0214] It should be noted that, when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0215] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here. For details not described in detail in the embodiment of the device, reference can be made to the above method embodiment.

[0216] Please refer to FIG17 , which shows a schematic diagram of the structure of a terminal device provided by an embodiment of the present application. The terminal device 1700 may include: a processor 1701 , a transceiver 1702 , and a memory 1703 .

[0217] The processor 1701 includes one or more processing cores. The processor 1701 executes various functional applications and information processing by running software programs and modules.

[0218] The transceiver 1702 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0219] The memory 1703 may be connected to the processor 1701 and the transceiver 1702 .

[0220] The memory 1703 may be used to store a computer program executed by the processor, and the processor 1701 is used to execute the computer program to implement each step in the above method embodiment.

[0221] In an exemplary embodiment, when the terminal device is a first terminal, the transceiver 1702 is configured to receive CSI-RS resource indication information sent by a second terminal;

[0222] Transceiver 1702 is also used to send first indication information to the second terminal, and the first indication information is carried through a first channel or a first signaling. The first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0223] In another exemplary embodiment, when the terminal device is a second terminal, the transceiver 1702 is configured to send CSI-RS resource indication information to the first terminal;

[0224] Transceiver 1702 is also used to receive first indication information sent by the first terminal, and the first indication information is carried through a first channel or a first signaling. The first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

[0225] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0226] In addition, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0227] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is used to be executed by a processor to implement the above-mentioned side communication method on the first terminal side, or to implement the above-mentioned side communication method on the second terminal side. Optionally, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives) or optical disks, etc. Among them, the random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0228] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the above-mentioned side communication method on the first terminal side, or to implement the above-mentioned side communication method on the second terminal side.

[0229] An embodiment of the present application also provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned side communication method on the first terminal side, or to implement the above-mentioned side communication method on the second terminal side.

[0230] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0231] In the description of 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 being indicated, configuration and being configured, etc.

[0232] In some embodiments of the present application, "predefined" 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., including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0233] In some embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, a NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0234] In this document, "plurality" refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0235] The term “greater than or equal to” mentioned herein may mean greater than or equal to, or greater than, and the term “less than or equal to” may mean less than or equal to, or less than.

[0236] In addition, the step numbers described in this document only illustrate a possible execution order between the steps. In some other embodiments, the above steps may not be executed in the order of the numbers, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in the opposite order of the diagram. The embodiments of the present application are not limited to this.

[0237] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0238] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A side communication method, characterized in that: The method comprises: The first terminal receives the channel state information reference signal CSI-RS resource indication information sent by the second terminal; The first terminal sends first indication information to the second terminal, the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

2. The method according to claim 1, characterized in that The first terminal sends the first channel or the first signaling using a first spatial domain transmission filter, where the first spatial domain transmission filter is a spatial domain transmission filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

3. The method according to claim 2, characterized in that The first spatial domain transmit filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship.

4. The method according to claim 2 or 3, characterized in that: The method further comprises: The first terminal determines the first spatial domain transmit filter according to the CSI-RS resource indication information.

5. The method according to any one of claims 1 to 4, characterized in that: The first channel or the first signaling includes a first physical sideline feedback channel PSFCH.

6. The method according to claim 5, characterized in that In a case where the CSI-RS resource indication information is carried by first sidelink control information SCI, the first SCI indicates activation of sidelink feedback; or, In a case where the CSI-RS resource indication information is carried by a first media access layer control unit MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates sideline feedback.

7. The method according to claim 5 or 6, characterized in that: The time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

8. The method according to claim 7, characterized in that The time unit where the first PSFCH is located is the first available time unit after the time unit n+k; or, The time unit where the first PSFCH is located is located in the first available time unit that is not earlier than the time unit n+k; Among them, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including PSFCH resources, and n and k are both positive integers.

9. The method according to any one of claims 1 to 4, characterized in that: The first channel or the first signaling includes a third SCI or a first physical sidelink shared channel PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

10. The method according to claim 9, characterized in that The signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, and a second PSFCH.

11. The method according to claim 9 or 10, characterized in that: The time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

12. The method according to claim 11, characterized in that The method further comprises: The first terminal determines, within a first time range, a sideline transmission resource for transmitting the third SCI or the first PSSCH; Among them, the starting position of the first time range is determined according to the time unit where the CSI-RS resource indication information is located, and the end position of the first time range or the duration of the first time range is determined according to any one of the following: protocol predefined information, pre-configuration information, network configuration information, neighbor communication interface 5-radio resource control PC5-RRC signaling, indication information of the first terminal, and indication information of the second terminal.

13. The method according to any one of claims 1 to 12, characterized in that: The value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal has successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal has not successfully received the CSI-RS resource indication information.

14. The method according to any one of claims 1 to 12, characterized in that: The first indication information indicates a first identifier; The first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

15. The method according to any one of claims 1 to 14, characterized in that The method further comprises: The first terminal receives beam failure indication information sent by the second terminal.

16. The method according to claim 15, characterized in that The first terminal receives the beam failure indication information and the CSI-RS resource indication information in the same time unit.

17. The method according to claim 15 or 16, characterized in that The beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, The beam failure indication information and the CSI-RS resource indication information are carried in different signalings.

18. A side communication method, characterized in that: The method comprises: The second terminal sends channel state information reference signal CSI-RS resource indication information to the first terminal; The second terminal receives first indication information sent by the first terminal, the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

19. The method according to claim 18, characterized in that The second terminal receives the first channel or the first signaling using a first spatial domain reception filter, where the first spatial domain reception filter is a spatial domain reception filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

20. The method according to claim 19, characterized in that The first terminal uses a first spatial domain sending filter to send the first channel or the first signaling, and the first spatial domain sending filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship.

21. The method according to any one of claims 18 to 20, characterized in that The first channel or the first signaling includes a first physical sideline feedback channel PSFCH.

22. The method according to claim 21, characterized in that In a case where the CSI-RS resource indication information is carried by first sidelink control information SCI, the first SCI indicates activation of sidelink feedback; or, In a case where the CSI-RS resource indication information is carried by a first media access layer control unit MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates sideline feedback.

23. The method according to claim 21 or 22, characterized in that The time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

24. The method according to claim 23, characterized in that The time unit where the first PSFCH is located is the first available time unit after the time unit n+k; or, The time unit where the first PSFCH is located is no earlier than the first available time unit after the time unit n+k; Among them, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including PSFCH resources, and n and k are both positive integers.

25. The method according to any one of claims 18 to 20, characterized in that The first channel or the first signaling includes a third SCI or a first physical sidelink shared channel PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

26. The method according to claim 25, characterized in that The signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, and a second PSFCH.

27. The method according to claim 25 or 26, characterized in that The time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

28. The method according to any one of claims 18 to 27, characterized in that The value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal has successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal has not successfully received the CSI-RS resource indication information.

29. The method according to claim 28, characterized in that The method further comprises: When the second terminal successfully receives the first indication information and the first indication information is the first value, the second terminal determines that the first terminal successfully receives the CSI-RS resource indication information; or, When the second terminal successfully receives the first indication information and the first indication information is the second value, the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information.

30. The method according to any one of claims 18 to 27, characterized in that The first indication information indicates a first identifier; The first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

31. The method according to any one of claims 18 to 30, characterized in that The method further comprises: In the case where the second terminal successfully receives the first channel or the first signaling, the second terminal determines that the first terminal successfully receives the CSI-RS resource indication information; or, In a case where the second terminal does not receive the first channel or the first signaling, the second terminal determines that the first terminal has not successfully received the CSI-RS resource indication information.

32. The method according to any one of claims 18 to 31, characterized in that The method further comprises: The second terminal sends beam failure indication information to the first terminal.

33. The method according to claim 32, characterized in that The second terminal sends the beam failure indication information and the CSI-RS resource indication information in the same time unit.

34. The method according to claim 32 or 33, characterized in that The beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, The beam failure indication information and the CSI-RS resource indication information are carried in different signalings.

35. A side communication device, characterized in that: The device comprises: A receiving module, configured to receive channel state information reference signal CSI-RS resource indication information sent by a second terminal; A sending module is used to send first indication information to the second terminal, the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

36. The device according to claim 35, characterized in that The first terminal sends the first channel or the first signaling using a first spatial domain transmission filter, where the first spatial domain transmission filter is a spatial domain transmission filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

37. The device according to claim 36, characterized in that The first spatial domain transmit filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship.

38. The device according to claim 36 or 37, characterized in that The device also includes: A processing module is used to determine the first spatial domain sending filter according to the CSI-RS resource indication information.

39. The device according to any one of claims 35 to 38, characterized in that The first channel or the first signaling includes a first physical sideline feedback channel PSFCH.

40. The device according to claim 39, characterized in that In a case where the CSI-RS resource indication information is carried by first sidelink control information SCI, the first SCI indicates activation of sidelink feedback; or, In a case where the CSI-RS resource indication information is carried by a first media access layer control unit MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates sideline feedback.

41. The device according to claim 39 or 40, characterized in that The time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

42. The device according to claim 41, characterized in that The time unit where the first PSFCH is located is the first available time unit after the time unit n+k; or, The time unit where the first PSFCH is located is located in the first available time unit that is not earlier than the time unit n+k; Among them, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including PSFCH resources, and n and k are both positive integers.

43. The device according to any one of claims 35 to 38, characterized in that The first channel or the first signaling includes a third SCI or a first physical sidelink shared channel PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

44. The device according to claim 43, characterized in that The signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, and a second PSFCH.

45. The device according to claim 43 or 44, characterized in that The time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

46. ​​The device according to claim 45, characterized in that The device also includes: A processing module, configured to determine a sideline transmission resource for transmitting the third SCI or the first PSSCH within a first time range; Among them, the starting position of the first time range is determined according to the time unit where the CSI-RS resource indication information is located, and the end position of the first time range or the duration of the first time range is determined according to any one of the following: protocol predefined information, pre-configuration information, network configuration information, neighbor communication interface 5-radio resource control PC5-RRC signaling, indication information of the first terminal, and indication information of the second terminal.

47. The device according to any one of claims 35 to 46, characterized in that The value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal has successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal has not successfully received the CSI-RS resource indication information.

48. The device according to any one of claims 35 to 46, characterized in that The first indication information indicates a first identifier; The first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

49. The device according to any one of claims 35 to 48, characterized in that The receiving module is also used to receive beam failure indication information sent by the second terminal.

50. The device according to claim 49, characterized in that The first terminal receives the beam failure indication information and the CSI-RS resource indication information in the same time unit.

51. The device according to claim 49 or 50, characterized in that The beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, The beam failure indication information and the CSI-RS resource indication information are carried in different signalings.

52. A side communication device, characterized in that: The device comprises: A sending module, configured to send a channel state information reference signal CSI-RS resource indication information to the first terminal; A receiving module is used to receive first indication information sent by the first terminal, the first indication information is carried through a first channel or a first signaling, and the first indication information or the first channel or the first signaling is used by the second terminal to determine whether the first terminal has successfully received the CSI-RS resource indication information.

53. The device according to claim 52, characterized in that The second terminal receives the first channel or the first signaling using a first spatial domain reception filter, where the first spatial domain reception filter is a spatial domain reception filter associated with the CSI-RS resource indicated by the CSI-RS resource indication information.

54. The device according to claim 53, characterized in that The first terminal uses a first spatial domain sending filter to send the first channel or the first signaling, and the first spatial domain sending filter and the CSI-RS resource indicated by the CSI-RS resource indication information are in a type D quasi-co-site relationship.

55. The device according to any one of claims 52 to 54, characterized in that The first channel or the first signaling includes a first physical sideline feedback channel PSFCH.

56. The device according to claim 55, characterized in that In a case where the CSI-RS resource indication information is carried by first sidelink control information SCI, the first SCI indicates activation of sidelink feedback; or, In a case where the CSI-RS resource indication information is carried by a first media access layer control unit MAC CE, a second SCI indication transmitted simultaneously with the first MAC CE activates sideline feedback.

57. The device according to claim 55 or 56, characterized in that The time unit where the first PSFCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

58. The device according to claim 57, characterized in that The time unit where the first PSFCH is located is the first available time unit after the time unit n+k; or, The time unit where the first PSFCH is located is no earlier than the first available time unit after the time unit n+k; Among them, time unit n is the time unit where the CSI-RS resource indication information is located, the time interval between the first PSFCH and the time unit where the CSI-RS resource indication information is located is k time units, and the available time unit refers to the time unit located in the resource pool and including PSFCH resources, and n and k are both positive integers.

59. The device according to any one of claims 52 to 54, characterized in that The first channel or the first signaling includes a third SCI or a first physical sidelink shared channel PSSCH; wherein, when the first channel or the first signaling is the first PSSCH, the first indication information is carried by a second MAC CE, and the second MAC CE is carried in the first PSSCH.

60. The device according to claim 59, characterized in that The signaling or channel carrying the CSI-RS resource indication information is any one of the following: a first SCI, a first MAC CE, and a second PSFCH.

61. The device according to claim 59 or 60, characterized in that The time unit where the third SCI or the first PSSCH is located is determined according to the time unit where the CSI-RS resource indication information is located.

62. The device according to any one of claims 52 to 61, characterized in that The value of the first indication information includes a first value and a second value, wherein the first value is used to indicate that the first terminal has successfully received the CSI-RS resource indication information, and the second value is used to indicate that the first terminal has not successfully received the CSI-RS resource indication information.

63. The device according to claim 62, characterized in that The device also includes a processing module, configured to: When the second terminal successfully receives the first indication information and the first indication information is the first value, determining that the first terminal successfully receives the CSI-RS resource indication information; or, When the second terminal successfully receives the first indication information and the first indication information is the second value, it is determined that the first terminal has not successfully received the CSI-RS resource indication information.

64. The device according to any one of claims 52 to 61, characterized in that The first indication information indicates a first identifier; The first identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information, or the first identifier is a transmission configuration indication state identifier, and the reference signal identifier associated with the transmission configuration indication state identifier is determined according to the CSI-RS resource indicated by the CSI-RS resource indication information.

65. The device according to any one of claims 52 to 64, characterized in that The device also includes a processing module, configured to: In a case where the second terminal successfully receives the first channel or the first signaling, determining that the first terminal successfully receives the CSI-RS resource indication information; or, In a case where the second terminal does not receive the first channel or the first signaling, it is determined that the first terminal has not successfully received the CSI-RS resource indication information.

66. The device according to any one of claims 52 to 65, characterized in that The sending module is also used to send beam failure indication information to the first terminal.

67. The device according to claim 66, characterized in that The second terminal sends the beam failure indication information and the CSI-RS resource indication information in the same time unit.

68. The device according to claim 66 or 67, characterized in that The beam failure indication information and the CSI-RS resource indication information are carried in the same signaling; or, The beam failure indication information and the CSI-RS resource indication information are carried in different signalings.

69. A terminal device, characterized in that: The terminal device includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the method according to any one of claims 1 to 17, or implements the method according to any one of claims 18 to 34.

70. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 17, or to implement the method according to any one of claims 18 to 34.

71. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the method according to any one of claims 1 to 17, or to implement the method according to any one of claims 18 to 34.

72. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. The processor reads and executes the computer instructions from the computer-readable storage medium to implement the method according to any one of claims 1 to 17, or to implement the method according to any one of claims 18 to 34.

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