CN117480834A

CN117480834A - Communication method and terminal

Info

Publication number: CN117480834A
Application number: CN202180099336.6A
Authority: CN
Inventors: 赵振山; 史志华; 丁伊
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2024-01-30
Also published as: WO2023028969A1

Abstract

A communication method and a terminal are provided. The method comprises the following steps: the first terminal generates indication information; the first terminal sends indication information to the second terminal. The first terminal sends the indication information to the second terminal, so that the second terminal determines the receiving beam matched with the sending beam selected by the first terminal based on the indication information, and the situation that the second terminal cannot select the receiving beam corresponding to the sending beam because the second terminal cannot know the sending beam selected by the first terminal in the traditional side-link communication scene is avoided, and the quality of side-link communication is improved.

Description

Communication method and terminal

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and a terminal.

Background

In order to improve the communication quality of the side-link, it is considered to introduce a multi-beam system in the side-link transmission. A transmitting terminal (also called a first terminal) and a receiving terminal (also called a second terminal) can select a transmitting beam and a receiving beam used for subsequent sidelink transmission through beam selection, beam measurement and other processes. However, when the first terminal selects the transmission beam based on the beam measurement result fed back by the second terminal, the second terminal cannot select an appropriate reception beam to receive the sidelink data due to the fact that the selection result of the first terminal cannot be known, which results in a decrease in the communication quality of the sidelink.

Disclosure of Invention

The application provides a communication method and a terminal for improving the communication quality of a side uplink.

In a first aspect, a communication method is provided, including: the first terminal generates indication information; the first terminal sends the indication information to the second terminal, where the indication information is used to indicate a first transmission configuration to indicate a TCI state, or the indication information is used to indicate that the second terminal uses a first airspace receiving filter to receive the sidestream data, the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first airspace reference signal, or the indication information is used to indicate the first terminal to send the sidestream data using a first airspace transmitting filter, the first airspace transmitting filter is a target airspace transmitting filter used by the first terminal to send a first airspace reference signal, or the indication information is used to indicate the second terminal to receive the sidestream data using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first airspace reference signal, or the indication information is used to indicate the first terminal to send the sidestream data using a first airspace transmitting parameter, and the first airspace transmitting parameter is the same as a target airspace receiving parameter used by the first terminal to send the first airspace reference signal.

In a second aspect, a communication method is provided, including: the second terminal receives the indication information sent by the first terminal; the second terminal receives the side-row data sent by the first terminal based on the indication information, wherein the indication information is used for indicating a first transmission configuration indication TCI state, or the indication information is used for indicating the second terminal to receive the side-row data by using a first airspace receiving filter, the first airspace receiving filter is used for the second terminal to receive a target airspace receiving filter used by a first side-row reference signal, or the indication information is used for indicating the first terminal to send the side-row data by using a first airspace sending filter, the first airspace sending filter is used for indicating the first terminal to send a target airspace sending filter used by a first airspace reference signal, or the indication information is used for indicating the second terminal to receive the side-row data by using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first airspace reference signal, or the indication information is used for indicating the first terminal to send the side-row data by using a first airspace sending parameter, and the first airspace sending parameter is the same as the first airspace receiving parameter used by the second terminal to send the first airspace reference signal.

In a third aspect, there is provided a first terminal comprising: a generation unit configured to generate instruction information; the sending unit is configured to send the indication information to the second terminal, where the indication information is used to indicate a first transmission configuration indication TCI state, or the indication information is used to indicate that the second terminal receives side-line data using a first airspace receiving filter, where the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first side-line reference signal, or the indication information is used to indicate that the first terminal uses a first airspace sending filter to send side-line data, and the first airspace sending filter is a target airspace sending filter used by the first terminal to send a first side-line reference signal, or the indication information is used to indicate that the second terminal uses a first airspace receiving parameter to receive side-line data, where the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first side-line reference signal, or the indication information is used to indicate that the first terminal uses a first airspace sending parameter to send side-line data, and the first airspace sending parameter is the same as a target airspace receiving parameter used by the first terminal to send the first side-line reference signal.

In a fourth aspect, there is provided a second terminal comprising: the receiving unit is used for receiving the indication information sent by the first terminal; and a transmitting unit, configured to receive the side-row data sent by the first terminal based on the indication information, where the indication information is used to indicate a first transmission configuration indication TCI state, or the indication information is used to indicate that the second terminal receives the side-row data using a first spatial reception filter, the first spatial reception filter is a target spatial reception filter used by the second terminal to receive a first side-row reference signal, or the indication information is used to indicate that the first terminal uses a first spatial transmission filter to send the side-row data, the first spatial transmission filter is a target spatial transmission filter used by the first terminal to send a first side-row reference signal, or the indication information is used to indicate that the second terminal uses a first spatial reception parameter to receive the side-row data, and the first spatial reception parameter is the same as a target spatial reception parameter used by the second terminal to receive the first side-row reference signal, or the indication information is used to indicate that the first terminal uses a first spatial transmission parameter to send the side-row data, and the first spatial transmission parameter is the same as the first spatial reception parameter used by the first terminal.

In a fifth aspect, there is provided a terminal comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method of the first or second aspect.

In a sixth aspect, there is provided an apparatus comprising a processor for invoking a program from memory to perform the method of the first or second aspect.

In a seventh aspect, there is provided a chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of the first or second aspect.

In an eighth aspect, there is provided a computer-readable storage medium having stored thereon a program that causes a computer to execute the method of the first or second aspect.

In a ninth aspect, there is provided a computer program product comprising a program for causing a computer to perform the method of the first or second aspect.

In a tenth aspect, there is provided a computer program for causing a computer to perform the method of the first or second aspect.

The first terminal sends the indication information to the second terminal, so that the second terminal determines the receiving beam matched with the sending beam selected by the first terminal based on the indication information, and the situation that the second terminal cannot select the receiving beam corresponding to the sending beam because the second terminal cannot know the sending beam selected by the first terminal in the traditional side-link communication scene is avoided, and the improvement of the communication quality of the side-link is facilitated.

Drawings

Fig. 1 is a wireless communication system 100 to which embodiments of the present application apply.

Fig. 2 shows the frame structure of a system frame in NR-V2X that does not carry a PSFCH.

Fig. 3 shows the frame structure of a system frame carrying a PSFCH in NR-V2X.

Fig. 4 shows a schematic diagram of time-frequency resources occupied by SL CSI-RS.

Fig. 5 shows a communication procedure based on beam communication in a scenario in which a network device communicates with a terminal.

Fig. 6 shows a communication procedure based on beam communication in a scenario in which a network device communicates with a terminal.

Fig. 7 shows a communication procedure based on beam communication in a scenario of side-link communication.

Fig. 8 is a flow chart of a communication method of an embodiment of the present application.

Fig. 9 shows a schematic diagram of the format of configuration information 1 of the embodiment of the present application.

Fig. 10 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application.

Fig. 11 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application.

Fig. 12 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application.

Fig. 13 shows a time domain position of transmission indication information in the embodiment of the present application.

Fig. 14 is a schematic diagram of a format of configuration information 2 of the embodiment of the present application.

Fig. 15 is a schematic diagram of a format of configuration information 2 according to another embodiment of the present application.

Fig. 16 is a schematic diagram of a first terminal according to an embodiment of the present application.

Fig. 17 is a schematic diagram of a second terminal according to an embodiment of the present application.

Fig. 18 is a schematic structural diagram of a communication apparatus of an embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings. For ease of understanding, the terms and communication procedures involved in the present application are described below in connection with fig. 1-7.

Fig. 1 is a wireless communication system 100 to which embodiments of the present application are applicable. The wireless communication system 100 may include a network device 110 and terminals 121-129. Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminals located within the coverage area.

In some implementations, communication may be performed from terminal to terminal via a Sidelink (SL). The side-link communication may also be referred to as proximity services (proximity services, proSe) communication, single-sided communication, side-chain communication, device-to-device (D2D) communication.

Or, the sidestream data is transmitted between the terminals through the sidestream link. Wherein the sidestream data may include data and/or control signaling. In some implementations, the sidelink data may be, for example, a physical sidelink control channel (physical sidelink control channel, PSCCH), a physical sidelink shared channel (physical sidelink control channel, PSSCH), a PSCCH demodulation reference signal (demodulation reference signal, DMRS), PSSCH DMRS, a Physical Sidelink Feedback Channel (PSFCH), or the like;

Several common side-uplink communication scenarios are described below in connection with fig. 1. In the side-link communication, 4 scenarios can be classified according to whether or not a terminal in the side-link is within the coverage of a network device. Scenario 1, a terminal performs side-link communication within the coverage area of a network device. Scenario 2, a portion of the terminals are in sidelink communication within the coverage of the network device. Scene 3, the terminal performs side-link communication outside the coverage range of the network device.

As shown in fig. 1, in scenario 1, terminals 121-122 may communicate via a side-link, and terminals 121-122 are all within the coverage of network device 110, or terminals 121-122 are all within the coverage of the same network device 110. In such a scenario, network device 110 may send configuration signaling to terminals 121-122, and accordingly, terminals 121-122 communicate over the side-links based on the configuration signaling.

As shown in fig. 1, in case 2, terminals 123-124 may communicate via a side-uplink, with terminal 123 being within the coverage of network device 110 and terminal 124 being outside the coverage of network device 110. In this scenario, terminal 123 receives configuration information for network device 110 and communicates over the side-link based on the configuration of the configuration signaling. However, for the terminal 124, since the terminal 124 is located outside the coverage area of the network device 110, the configuration information of the network device 110 cannot be received, and at this time, the terminal 124 may acquire the configuration of the side uplink communication based on the configuration information according to the pre-configuration (pre-configuration) and/or the configuration information transmitted by the terminal 123 located in the coverage area, so as to communicate with the terminal 123 through the side uplink based on the acquired configuration.

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

As shown in fig. 1, in case 3, terminals 125-129 are all outside the coverage area of network device 110 and cannot communicate with network device 110. In this case, the terminal can configure the side-link communication based on the pre-configuration information.

In some cases, terminals 127-129 that are outside the coverage area of the network device may form a communication group, and terminals 127-129 within the communication group may communicate with each other. In addition, the terminals 127 in the communication group may serve as central control nodes, also referred to as group head terminals (CH), and correspondingly, terminals in other communication groups may be referred to as "group members".

The terminal 127 as a CH may have one or more of the following functions: is responsible for the establishment of a communication group; joining and leaving of group members; performing resource coordination, distributing side transmission resources for group members, and receiving side feedback information of the group members; and performing resource coordination and other functions with other communication groups.

It should be noted that fig. 1 exemplarily illustrates one network device and a plurality of terminal devices, alternatively, the wireless communication system 100 may include a plurality of network devices and each network device may include other number of terminal devices within a coverage area of the network device, which is not limited in the embodiment of the present application.

Optionally, the wireless communication system 100 may further include a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present application.

It should be understood that the technical solution of the embodiments of the present application may be applied to various communication systems, for example: fifth generation (5th generation,5G) systems or New Radio (NR), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system, a satellite communication system and the like.

A terminal in an embodiment of the present application may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a Mobile Terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the application can be a device for providing voice and/or data connectivity for a user, and can be used for connecting people, things and machines, such as a handheld device with a wireless connection function, a vehicle-mounted device and the like. The terminal device in the embodiments of the present application may be a mobile phone (mobile phone), a tablet (Pad), a notebook, a palm, a mobile internet device (mobile internet device, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like. Alternatively, the UE may be used to act as a base station. For example, the UEs may act as scheduling entities that provide sidestream data between UEs in V2X or D2D, etc. For example, a cellular telephone and a car communicate with each other using sidestream data. Communication between the cellular telephone and the smart home device is accomplished without relaying communication signals through the base station.

The network device in the embodiments of the present application may be a device for communicating with a terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master MeNB, a secondary SeNB, a multi-mode wireless (MSR) node, a home base station, a network controller, an access node, a wireless node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a remote radio unit (Remote Radio Unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for placement within the aforementioned device or apparatus. The base station may also be a mobile switching center, a device-to-device (D2D), a vehicle-to-device (V2X), a device that assumes a base station function in machine-to-machine (M2M) communication, a network-side device in a 6G network, a device that assumes a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

The base station may be fixed or mobile. For example, a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device to communicate with another base station.

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

Network devices and terminal devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. In the embodiment of the application, the scene where the network device and the terminal device are located is not limited.

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

Side-link resource allocation mode

Currently, in some communication systems (e.g., NR), two resource allocation manners of side link resources, mode 1 and mode 2, are defined.

Mode 1, side uplink resources are scheduled for a terminal device by a network device.

Currently, in mode 1, two modes, dynamic resource allocation (dynamic resource allocation) and side-uplink configuration grant (sidelink configured grant, SL CG), can be distinguished. Under dynamic resource allocation, the network device may allocate side transmission resources for the terminal by sending downlink control information (downlink control information, DCI). In the side-link configuration authorization mode, after the terminal is configured with the side-link resources, if the terminal has data to be sent, the terminal can transmit the data by using the configured side-link resources without re-applying the side-link resources to the network device. Therefore, the transmission delay of the side uplink can be reduced by adopting a resource configuration mode for configuring the authorization.

The configuration grant is subdivided into two types, in Type1 (Type 1) of the configuration grant, the side-uplink resource configuration is based entirely on radio resource control (radio resource control, RRC) signaling. In Type2 (Type 2) of configuration grant, the side-uplink resource configuration in the communication system may be jointly configured by RRC signaling and layer 1 (L1) signaling, where the L1 signaling is used to indicate activation and deactivation of the RRC configuration.

In some implementations, the network device may schedule side uplink resources for a single transmission for the terminal. In other implementations, the network device may also configure semi-static side uplink resources for the terminal.

For example, referring to FIG. 1, where terminal devices 121-123 are located within the coverage area of network device 110, network device 110 may allocate side uplink resources for terminal devices 121-123.

Mode 2, the terminal autonomously selects side uplink resources in the resource pool.

In this mode, the processes performed by the terminal include a resource probing process and/or a resource selection process. During the resource probing, the terminal can identify the occupancy of the sidelink resources by demodulating the sidelink control information (sidelink control information, SCI). The terminal can also identify the occupancy of the side link resources by measuring the received power of the side link.

For example, referring to fig. 1, terminal devices 124-129 are located outside the coverage area of network device 110, and terminal devices 124-129 may autonomously select side uplink resources in the manner of mode 2 described above.

Side-link transmission mode

With the development of autopilot technology, autopilot technology and a communication system can be integrated, or data interaction between vehicle-mounted devices needs to be realized through the communication system. Thus, higher demands are placed on the communication system. For example, communication systems are required to support higher throughput, lower latency, higher reliability, greater coverage, more flexible resource allocation, etc. In LTE-V2X, side-link communication is performed in such a manner that only broadcasting is supported between terminals. With the development of technology, unicast and multicast transmission modes are introduced in NR-V2X.

For unicast transmission, there is typically only one terminal receiving the sidestream data. Referring to fig. 1, communication between the terminal 121 and the terminal 122 may be through a unicast transmission manner, and when the terminal 121 transmits sidestream data through a sidestream link, the terminal 122 receives the sidestream data as a unique receiving device.

For the transmission mode of multicast, the terminal receiving the side line data may be all terminals in one communication group, or the terminal receiving the side line data may be all terminals within a certain transmission distance. For example, referring to fig. 1, for a communication group including terminals 127-129, when terminal 127 transmits sidestream data in a multicast manner, the other terminals 128-129 in the communication group are all receiving terminals that receive the sidestream data. For another example, referring to fig. 1, assuming that the terminals within the preset range include the terminals 127 to 129, when the terminal 127 transmits the sidestream data in a multicast manner, the other terminals 128 to 129 within the preset range are all receiving terminals that receive the sidestream data.

For the broadcast transmission scheme, the terminal that receives the side line data may be any terminal around the terminal that is the transmitting end. For example, referring to fig. 1, assuming that the terminal 125 serves as a transmitting end and transmits side line data in the form of broadcasting, the terminals 121 to 124 and 126 to 129 located around the terminal 125 can serve as receiving ends of the side line data.

System frame structure

The frame structure of the side-uplink system frame to which the embodiments of the present application are applied is described below with reference to fig. 2 to 3. Fig. 2 shows the frame structure of a system frame in NR-V2X that does not carry a PSFCH. Fig. 3 shows the frame structure of a system frame carrying a PSFCH in NR-V2X.

Referring to fig. 2, in the time domain, the side-row symbols occupied by the PSCCH start from the second side-row symbol of the system frame (e.g., an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol), occupying 2 or 3 side-row symbols. In the frequency domain, the PSCCH may occupy {10,12, 15,20,25} physical resource blocks (physical resource block, PRBs). In general, in order to reduce the complexity of blind detection of PSCCH by a terminal device, only one PSCCH symbol number and PRB number is allowed to be configured in one resource pool. In addition, since the sub-channel is the minimum granularity of PSSCH resource allocation specified in NR-V2X, the number of PRBs occupied by the PSCCH must be less than or equal to the number of PRBs contained in one sub-channel in the resource pool, so as not to cause additional limitation on PSSCH resource selection or allocation.

With continued reference to fig. 2, in the time domain, the PSSCH also starts with the second sidestream symbol of the system frame until the last-to-last sidestream symbol of the system frame ends. In the frequency domain, the PSSCH occupies K subchannels of the system frame, each subchannel comprising N consecutive PRBs, K and N being positive integers.

Typically, the last symbol of the system frame is a Guard Period (GP) symbol. In addition, the first side symbol of the system frame is a repetition of the second side symbol, and typically the first side symbol may be used as an automatic gain control (automatic gain control, AGC) symbol by the terminal when receiving the system frame, and the data on the AGC symbol is typically not used for data demodulation.

Referring to fig. 3, when a PSFCH channel is carried in a system frame, the penultimate sidestream symbol and the third-to-last sidestream symbol in the system frame are used for PSFCH transmission. In addition, a sidestream symbol preceding the PSFCH sidestream symbol is carried in the system frame as GP.

Sidestream CSI-RS

To better support unicast communication, SL channel state information reference signals (channel state information reference signal, CSI-RS) are supported in NR-V2X. The NR-V2X specifies that SL CSI-RS is transmitted only when the following 3 conditions are satisfied.

In condition 1, the terminal device needs to transmit the PSSCH corresponding to the SL CSI-RS, that is, the terminal device cannot transmit only the SL CSI-RS.

And 2, activating the sidestream CSI reporting through a high-layer signaling.

And 3, under the condition that the lateral CSI reporting is activated by the high-layer signaling, triggering the lateral CSI reporting by the corresponding bit in the second-order SCI sent by the terminal equipment.

The maximum port number supported by the SL CSI-RS is 2, the SL CSI-RSs of different ports are multiplexed on two adjacent REs of the same sidelink symbol in a code division mode when the two ports are arranged, and the number of the SL CSI-RSs of each port in one PRB is 1, namely the density is 1. Therefore, the SL CSI-RS will only appear on at most one sidelink symbol within one PRB, and the specific position of this sidelink symbol is determined by the terminal device transmitting the SL CSI-RS.

In general, to avoid affecting the resource mapping of the PSCCH and second order SCI, the SL CSI-RS cannot be located in the same sidelink symbol as the PSCCH and second order SCI.

In addition, since the channel estimation accuracy of the side-row symbol where PSSCH DMRS is located is higher, and the SL CSI-RS of the two ports will need to occupy two consecutive Resource Elements (REs) on the frequency domain, the SL CSI-RS cannot be transmitted through the same side-row symbol as the DMRS of the PSSCH.

In some cases, the position of the sidelink symbol occupied by the SL CSI-RS may be indicated by the SL-CSI-RS-first symbol parameter in PC5 RRC. And, the position of the first RE occupied by SL CSI-RS in one PRB is indicated by the "SL-CSI-RS-FreqAllocation" parameter in PC5 RRC. If the SL CSI-RS corresponds to one port, the parameter is a bit map with a length of 12, corresponding to 12 REs in one PRB. If the SL CSI-RS corresponds to two ports, the parameter is a bit map of length 6, in which case the SL CSI-RS occupies two REs of 2f (1) and 2f (1) +1, where f (1) represents the identity of the bit of value 1 in the bit map.

The frequency domain position occupied by the SL CSI-RS is also determined by the terminal device transmitting the SL CSI-RS, and it is noted that the determined frequency domain position of the SL CSI-RS cannot collide with the frequency domain position occupied by the PT-RS.

Fig. 4 shows a schematic diagram of time-frequency resources occupied by SL CSI-RS. Referring to fig. 4, assume that the number of ports corresponding to the SL CSI-RS is 2, SL-CSI-RS-first symbol indicates a position 8 of a sideline symbol occupied by the SL CSI-RS, and SL-CSI-RS-FreqAllocation indicates that the position of the first RE occupied by the SL CSI-RS within one PRB is [ b ] ₅ ,b ₄ ,b ₃ ,b ₂ ,b ₁ ,b ₀ ]＝[0,0,0,1,0,0]。

Multi-beam system in NR system

Design goals for communication systems (e.g., NR) include high bandwidth communication in high frequency bands (e.g., bands above 6 GHz). As the operating frequency becomes higher, the path loss during transmission increases, thereby affecting the coverage capability of the high frequency system. Therefore, in order to effectively ensure the coverage of the high-frequency band, an effective technical scheme is based on a large-scale antenna array (Massive MIMO) to form a shaped beam with larger gain, overcome propagation loss and ensure the coverage of a communication system.

At present, a common large-scale antenna array is a millimeter wave antenna array, and because the wavelength emitted by the millimeter wave antenna array is short, the space between antenna elements of the antenna array can be short, the aperture of the antenna elements can be small, so that more physical antenna elements can be integrated in a two-dimensional antenna array with limited size.

In addition, due to the limited size of the millimeter wave antenna array, a digital beam forming mode cannot be adopted from the factors of hardware complexity, cost overhead, power consumption and the like, but an analog beam forming mode is generally adopted, so that network coverage is enhanced, and meanwhile, the realization complexity of equipment can be reduced.

In order to facilitate understanding of the multi-beam system, a communication procedure based on beam communication is described below with reference to fig. 5 to 6 taking as an example a scenario in which a network device communicates with a terminal.

Referring to fig. 5, in a conventional communication system (e.g., a 4G communication system), a wider beam (beam) 510 is typically used to cover the entire cell (or "sector"). In this way, terminals (e.g., terminals 511-515) within the cell at each instant may communicate with the network device over this wider beam, e.g., acquire transmission resources allocated by the network device.

Referring to fig. 6, in newer communication systems (e.g., NR), a Multi-beam (Multi-beam) system 610 may be used to cover the entire cell, that is, each beam (e.g., beams 611-614) in the Multi-beam system covers a smaller range in the cell, respectively, and the effect of multiple beams covering the entire cell is achieved by means of beam scanning.

During beam scanning different beams are used at different times to cover different areas in the cell, e.g. at time 1 the communication system may cover the area where terminal 1 is located by beam 611. At time 2, the communication system may cover the area where terminal 2 is located by beam 612. At time 3, the communication system may cover the area where terminals 3 and 4 are located by beam 613. At time 4, the communication system may cover the area where terminal 5 is located by beam 614.

For multi-beam systems, the transmit energy can be more concentrated and thus cover greater distances due to the use of narrower beams. But also because the beams are narrow, each beam can only cover a partial area in the cell, so a multi-beam system can be understood as "space-in-time".

In general, a beam used by a transmitting end to transmit a signal is referred to as a "transmission beam". The beam used by the receiving end to receive the signal is referred to as a "receive beam".

In some cases, the transmit beam may also be referred to as a spatial transmit filter (spatial domain transmission filter), and correspondingly the receive beam may also be referred to as a spatial receive filter (spatial domain reception filter). In other cases, the transmit beam may also be referred to as spatial transmit parameters (spatial domain transmission parameter), and correspondingly the receive beam may also be referred to as spatial receive parameters (spatial domain reception parameter). For ease of understanding, the embodiments of the present application will be mainly described by taking beams as examples.

In the communication scenario between the network device and the terminal, if the network device and the terminal support multi-beam transmission, the network device and the terminal need to select appropriate transmit beams and receive beams through beam selection, beam measurement, and other processes before the network device communicates with the terminal. For example, in the process of selecting a transmission beam, the network device may use different transmission beams to transmit multiple reference signals in turn, where the resources corresponding to the multiple reference signals are different. Accordingly, the terminal also receives the plurality of reference signals using the plurality of reception beams, respectively, and measures the detected reference signals to obtain measurement results. Then, the terminal selects a part of reference signals from the detected multiple reference signals, and feeds back the resource identification of the part of reference signals and the corresponding measurement results thereof to the network equipment, so that the network equipment can select a proper transmission beam as a transmission beam for subsequent communication with the terminal.

Typically, after the network device selects an appropriate transmit beam, the terminal needs to select a receive beam that matches the transmit beam to communicate with the network device. Currently, the communication protocol specifies that the transmission beam selected by the network device may be indicated by transmitting quasi co-located (QCL) information in a configuration indication (transmission configuration indicator, TCI) state.

QCL in NR system

Typically, antenna ports (antenna ports) are used to characterize wireless channel conditions, and the channel conditions experienced by signals on different antenna ports are naturally different, but even so, the channels of different antenna ports may still have some common properties, which may be referred to as large-scale channel properties (large-scale channel property). Based on this, we introduced the concept of QCL: two antenna ports are said to be co-located if the large-scale channel properties of the channel through which the symbol on one of the antenna ports passes can be inferred from the channel through which the symbol on the other antenna port passes.

For example, two different signals are transmitted from two closely spaced antenna ports, which may experience different sidestream channel conditions due to fading, but the large scale parameters of the two channels may be the same, in which case the two signals are quasi co-sited though corresponding to different antenna ports.

The large-scale channel attributes include: doppler shift (doppler shift), doppler spread (doppler spread), average delay (average delay), delay spread (delay spread), and spatial domain receive parameters (spatial RX parameter).

The spatial domain receiving parameters correspond to a series of spatial domain receiving attributes and are mainly used for frequency bands above 6GHz, because the frequency bands above NR 6GHz use digital-analog mixed beam forming, the pointing direction and the width of analog beams can influence the large-scale characteristics of a channel, and therefore the parameters are introduced to characterize the influence of the beams on the characteristics of the channel. If the spatial reception parameters of the two reference signals are quasi co-located, then the network device transmits over the same transmit beam, meaning that the terminal can receive both reference signals using the same receive beam.

TCI state in NR systems

In order to improve the reception performance of the terminal, the terminal may improve the reception algorithm by using characteristics of a transmission environment corresponding to signal transmission when receiving the signal. The statistical properties of the channel may be used, for example, to optimize the design and parameters of the channel estimator. In general, these characteristics corresponding to the signal transmission can be represented by QCL information (QCL-Info) in the TCI state.

In the NR system, if the transmission beams of the transmission signals are different, the characteristics of the transmission environment corresponding to the signal transmission may also change, so the network device indicates the corresponding QCL state information to the terminal through the TCI state before transmitting the signals.

In general, the TCI state may contain Identification (ID) and/or QCL information of the TCI state. Wherein the identification of the TCI state is used to identify the TCI state. The QCL information may in turn comprise QCL type configurations and QCL reference signal configurations.

The QCL type configuration may include QCL type a, QCL type B, QCL type C, or QCL type D. Wherein, the definition of different QCL type configurations is as follows.

QCL type A (QCL-TypeA) { Doppler shift, doppler spread, average delay, delay spread }

QCL type B (QCL-TypeB) { Doppler shift, doppler spread }

QCL type C (QCL-TypeC): { Doppler shift, average delay }

QCL type D (QCL-type): { spatial reception parameters }.

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

Currently, the pseudocode that the communication protocol specifies the TCI state described above may be as follows.

As introduced above, in an NR system, a network device can indicate a transmit beam to a terminal by indicating a TCI state. If the network device configures, through the TCI state, the identity of the reference signal quasi-co-located with the signal to be transmitted to be 1, and the QCL type is type a, type B or type C, the terminal may assume that the signal to be transmitted has the same large-scale channel parameter as the reference signal identified as 1, and the large-scale channel parameter may be determined through the QCL type in the TCI state.

If the network device configures, through the TCI state, the identifier of the reference signal quasi-co-located with the signal to be transmitted to be 1, and the QCL type is QCL type D, the terminal receives the reception beam adopted by the signal to be transmitted, and is the same as the reception beam adopted by the reference signal with the identifier of 1.

Multi-beam system in a side-uplink communication scenario

Based on the advantages of the multi-beam system described above, it is desirable to introduce the multi-beam system also in the side-uplink communication scenario, that is, the multi-beam system described above may also be applied in transmitting terminals and/or receiving terminals of side-uplink communication. The procedure of beam selection in the side-uplink communication scenario will be described below.

If a terminal (also called a first terminal) as a transmitting end and/or a terminal (also called a second terminal) as a receiving end in side-link communication can support multi-beam transmission, both the first terminal and the second terminal need to select an appropriate transmit beam and receive beam through beam selection, beam measurement, etc. before the first terminal transmits side-line data. For ease of understanding, the procedure of beam selection in a scenario where the first terminal supports multi-beam transmission and the second terminal uses the same beam transmission will be described in connection with fig. 7.

Referring to fig. 7, it is assumed that the first terminal supports 4 transmission beams 0 to 3. In the process of selecting a transmission beam, the first terminal uses different transmission beams 0 to 3 to transmit a plurality of sideline reference signals in turn, and the identifiers of the sideline reference signals (for example, the resource identifiers of the sideline reference signals) are different. Accordingly, the second terminal receives the plurality of side reference signals transmitted through the transmission beams 0 to 3 using the same reception beam, and measures the detected side reference signals to obtain a measurement result. And then, the second terminal selects N pieces of detected sidestream reference signals, and feeds back the identification of the N pieces of sidestream reference signals and corresponding measurement results thereof to the first terminal, so that the first terminal selects a proper transmission beam as a transmission beam of subsequent transmission sidestream data. For example, the first terminal selects a beam corresponding to the sidelink reference signal with the optimal measurement result as the transmission beam.

In some scenarios, the second terminal may also support multi-beam transmission, assuming that the second terminal supports 4 receive beams 0-3. At this time, the second terminal also needs to receive the sideline reference signals transmitted by the first terminal by using the respective reception beams in turn. Assume that a first terminal supports 4 transmit beams 0-3 and a second terminal supports 4 receive beams 0-3. In the process of transmitting beam selection, the first terminal uses different transmitting beams 0-3 to alternately transmit a plurality of sideline reference signals, and the identifiers of the sideline reference signals are different. Accordingly, the second terminal receives the plurality of sideline reference signals transmitted through the transmission beams 0 to 3 using the reception beams 0 to 3, respectively, and measures the detected sideline reference signals to obtain a measurement result. In one possible implementation, the second terminal may first receive the plurality of side line reference signals transmitted through the transmission beams 0 to 3 using the reception beam 0, then the second terminal may receive the plurality of side line reference signals transmitted through the transmission beams 0 to 3 using the reception beam 1 again, then the second terminal may receive the plurality of side line reference signals transmitted through the transmission beams 0 to 3 using the reception beam 2 again, and finally the second terminal may receive the plurality of side line reference signals transmitted through the transmission beams 0 to 3 using the reception beam 3 again.

After the second terminal obtains the measurement result, the second terminal may select N pieces of detected sideline reference signals based on the measurement result, and feed back the identifiers of the N pieces of sideline reference signals and the corresponding measurement results to the first terminal, so that the first terminal selects an appropriate transmission beam as a transmission beam of subsequent transmission sideline data. For example, the first terminal selects a beam corresponding to the sidelink reference signal with the optimal measurement result as the transmission beam.

Based on the above description, the identities of the sideline reference signals sent by different beams are different, so for the second terminal supporting 4 receiving beams and the first terminal supporting 4 sending beams, the sideline reference signals with 16 different identities need to be sent to complete the alternate pairing of all sending beams and receiving beams.

It should be understood that the above process of determining the transmission beam and the reception beam is only exemplary, and the embodiments herein do not limit the method of determining the transmission beam and the reception beam.

The sidelink reference signals may be reference signals for beam selection and beam measurement. The sidelink reference signals may be one or more of CSI-RS, PSCCH DMRS, PSSCH DMRS, phase tracking reference signals (phase tracking reference signal, PT-RS).

However, after the first terminal selects an appropriate transmission beam as a transmission beam of the subsequent transmission side line data based on the measurement result, if the second terminal cannot learn the selection result of the first terminal, a reception beam matching the transmission beam cannot be selected as a reception beam of the subsequent side line data, resulting in degradation of communication quality of the side link.

Therefore, the embodiment of the application provides a communication method, so as to instruct the second terminal of a receiving beam used when receiving side line data by sending instruction information to the second terminal, so as to improve the communication quality of the side line between the first terminal and the second terminal.

The flow of the communication method according to the embodiment of the present application will be described below with reference to fig. 8. The communication method shown in fig. 8 includes step S810 and step S820.

In step S810, the first terminal generates instruction information.

In step S820, the first terminal transmits instruction information to the second terminal.

The description of the function of the above-described indication information may be different in different cases, and the function of the above-described indication information is described separately from the following six aspects.

1. The indication information is used for indicating the first TCI state.

The first TCI state is used to indicate a receiving beam used by the second terminal to receive side line data. Alternatively, the first TCI state is used to indicate a transmission beam used by the first terminal to transmit side line data, and accordingly, the second terminal may determine a reception beam of the reception side line data based on the transmission beam.

The transmit beam and/or the receive beam indicated by the first TCI state may be selected by the beam selection procedure described above. Of course, the above-mentioned transmitting beam and/or receiving beam may also be selected by other beam selection manners, which are not limited in this embodiment of the present application.

The transmission beam indicated by the first TCI state may be the optimal transmission beam selected by the beam selection process, or may be a preferred transmission beam selected by the beam selection process. The preferred transmission beam may be understood as a measurement result of the sidelink reference signal transmitted by the transmission beam is higher than a preset threshold. The predetermined threshold may be, for example, a predetermined received power, a predetermined signal energy, etc. The optimal transmission beam may be understood as that the measurement result of the sideline reference signal transmitted by the transmission beam is better than the measurement result corresponding to the sideline reference signal transmitted by other beams in the beam selection process.

The receiving beam indicated by the first TCI state may be the optimal receiving beam selected by the beam selection process, or may be the preferred receiving beam selected by the beam selection process. The preferred reception beam may be understood as a measurement result of the sidelink reference signal received by the reception beam is higher than a preset threshold. The predetermined threshold may be, for example, a predetermined received power, a predetermined signal energy, etc. The optimal receiving beam may be understood as that the measurement result of the sideline reference signal sent by the receiving beam is better than the measurement result corresponding to the sideline reference signal received by other beams in the beam selection process.

In some cases, the transmit beam may be replaced with a spatial transmit filter and the receive beam may be replaced with a spatial receive filter. I.e. the first TCI state is used to indicate the spatial domain receive filter used by the second terminal to receive side line data. Alternatively, the first TCI state is used to instruct the first terminal to transmit the spatial transmit filter used by the sideline data, and accordingly, the second terminal may determine the spatial receive filter for receiving the sideline data based on the spatial transmit filter.

In other cases, the transmit beam may be replaced with spatial domain transmit parameters and the receive beam may be replaced with spatial domain receive parameters. I.e. the first TCI state is used to indicate the airspace receiving parameter used by the second terminal to receive the sidestream data. Or, the first TCI state is used to indicate a spatial domain transmission parameter used by the first terminal to transmit the side line data, and accordingly, the second terminal may determine a spatial domain reception parameter of the receiving side line data based on the spatial domain transmission parameter.

The first TCI state may include an identification of a sidestream reference signal and/or QCL information (QCL-Info). The QCL information may be a QCL Type (QCL-Type), among others. The QCL types include a QCL type A, a QCL type B, a QCL type C and a QCL type D. When the QCL type is QCL type D, the first TCI state may be used to indicate a reception beam used by the second terminal to receive side line data, or the first TCI state may be used to indicate a transmission beam used by the first terminal to transmit side line data.

The identification of the side reference signal may be a resource identification (SL-RS-resource id) of the side reference signal, or an index of the side reference signal. At this time, the first TCI state is used to indicate the transmission beam of the sideline reference signal included in the first TCI state, which is the same as the transmission beam used for the subsequent transmission of the sideline data. Alternatively, the first TCI state is used to indicate that the received beam of the sideline reference signal included in the first TCI state is the same as the received beam of the subsequent sideline data. In another embodiment, the first TCI state is used to instruct the second terminal to receive the sidestream data sent by the first terminal using the same receive beam as the sidestream reference signal included in the first TCI state.

In addition, the sidelink reference signal included in the first TCI state may be the sidelink reference signal described in the above-described sidelink system in the sidelink scenario, and is not described herein for brevity.

Of course, in some implementations, the first TCI state may further include an identification of the TCI state (TCI-StateId), where the identification of the TCI state is used to identify the TCI state.

In other implementations, when the terminal may communicate on multiple side rows BWP, the TCI states configured on different side rows BWP may also be different, so the above-mentioned first TCI state may also indicate the BWP associated with the first TCI state, e.g. the first TCI state may include an identification (BWP-Id) of the BWP by which the side row BWP associated with the first TCI state is indicated.

In other implementations, when the terminal may communicate on multiple side carriers, TCI states configured on different side carriers may also be different, so the first TCI state may also indicate a side carrier associated with the first TCI state, for example, including an identifier (carrier-ID) of the side carrier, and indicate a side carrier corresponding to the first TCI state through the identifier of the side carrier.

In some implementations, the pseudo code corresponding to the first TCI state may be as follows.

In some implementations, the pseudocode corresponding to the above QCL information (QCL-Info) may be as follows.

2. The indication information is used for indicating the second terminal to receive the side line data by using the first spatial domain receiving filter. The first spatial domain receiving filter is a target spatial domain receiving filter used by the second terminal for receiving the first lateral reference signal.

The first sidelink reference signal may be a sidelink reference signal described above when describing the multi-beam system in the sidelink communication scenario, and is not described herein for brevity.

The target spatial receive filter (also referred to as a "target receive beam") may be selected by the receive beam selection process described above. For example, based on the above-described reception beam selection procedure, the above-described target spatial reception filter may be selected by the second terminal from a plurality of spatial reception filters supported by the second terminal based on the measurement result. Of course, the target spatial domain receiving filter may be selected in other manners, which is not limited in the embodiments of the present application.

The target spatial reception filter may be the optimal spatial reception filter selected, or may be the optimal spatial reception filter selected. The preferred spatial domain receiving filter may be understood that the measurement result of the side-line reference signal received by the spatial domain receiving filter is higher than a preset threshold. The predetermined threshold may be, for example, a predetermined received power, a predetermined signal energy, etc. The optimal spatial reception filter may be understood as a measurement result of the side reference signal received by the spatial reception filter is better than measurement results corresponding to the side reference signals received by other spatial reception filters supported by the second terminal.

For example, referring to fig. 7, assuming that the second terminal feeds back the resources for the N sideline reference signals and the corresponding measurement results, the first terminal determines that the measurement result of the resource 1 of the sideline reference signal is optimal based on the measurement result, where the target spatial reception filter may be a spatial reception filter used by the second terminal for the sideline reference signal corresponding to the resource 1 of the second terminal for receiving the sideline reference signal.

For another example, referring to fig. 7, assuming that the second terminal feeds back the resources for the N sideline reference signals and the corresponding measurement results, the first terminal determines that the measurement results of the resource 2 of the sideline reference signal and the resource 3 of the sideline reference signal are better based on the measurement results, but the measurement results of the resource 2 of the sideline reference signal and the resource 3 of the sideline reference signal are worse than the measurement results of the resource 1 of the sideline reference signal, but for some reasons, the first terminal does not use the spatial domain transmission filter corresponding to the resource 1 of the sideline reference signal, and accordingly, the second terminal cannot use the spatial domain reception filter corresponding to the resource 1 of the sideline reference signal. At this time, the first terminal may arbitrarily select one spatial transmission filter from the spatial transmission filters corresponding to the resources 2 and 3 of the side reference signals. It is assumed that the first terminal selects the spatial domain transmission filter corresponding to the sideline reference signal resource 2, and indicates the second terminal through the TCI state according to the selection result. Correspondingly, the second terminal receives the sidestream data by using the airspace receiving filter corresponding to the sidestream reference signal resource 2 according to the TCI state, that is, the airspace receiving filter corresponding to the sidestream reference signal resource 2 is the target airspace receiving filter.

It should be noted that, some reasons may include that the transmission condition of the sidelink data changes, so that the spatial domain transmission filter corresponding to the resource 1 of the sidelink reference signal is not available. Or, some reasons may further include that the first terminal may send sidestream data to the second terminal and other terminals through other spatial transmission filters at the same time, so that the first terminal does not use the spatial transmission filter corresponding to resource 1 of the sidestream reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include a sideline reference signal resource 1 and a sideline reference signal resource 2, the sideline reference signal resources fed back by the third terminal to the first terminal include a sideline reference signal resource 2 and a sideline reference signal resource 3, and the first terminal needs to send sideline data (for example, sideline feedback information) to the second terminal and the third terminal at the same time in a certain time slot, at this time, in order to send sideline data to the second terminal and the third terminal at the same time, the first terminal may select a spatial domain transmission filter corresponding to the reference signal resource 2 to send.

And thirdly, the indication information is used for indicating the first terminal to use a first airspace transmission filter to transmit the side line data, and the first airspace transmission filter is a target airspace transmission filter used by the first terminal to transmit the first side line reference signal.

The target spatial transmit filter (also referred to as a "target transmit beam") may be selected by the beam selection process described above. For example, based on the above-described transmit beam selection procedure, the above-described target spatial transmit filter may also be selected by the first terminal based on the measurement result fed back by the second terminal. Of course, the target spatial domain transmission filter may be selected in other manners, which is not limited in the embodiments of the present application.

The target spatial domain transmission filter may be the optimal spatial domain transmission filter selected, or may be a preferred spatial domain transmission filter selected. The preferable spatial domain transmission filter may be understood that a measurement result of the side-line reference signal transmitted by the spatial domain transmission filter is higher than a preset threshold. The preset threshold may be, for example, a preset transmit power, a preset signal energy, etc. The optimal spatial domain transmission filter may be understood that the measurement result of the side-line reference signal transmitted by the spatial domain transmission filter is better than the measurement result corresponding to the side-line reference signal transmitted by the other spatial domain transmission filters supported by the first terminal.

For example, referring to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N sidelink reference signals, the first terminal determines that the measurement result of the resource 1 of the sidelink reference signal is optimal based on the measurement results, at this time, the target spatial domain transmission filter may be a spatial domain transmission filter used by the sidelink reference signal corresponding to the resource 1 of the second terminal transmitting the sidelink reference signal.

For another example, referring still to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N side reference signals, the first terminal determines that the measurement results of the resources 2 for the side reference signals and the resources 3 for the side reference signals are better based on the measurement results, but the measurement results of the resources 2 for the side reference signals and the resources 3 for the side reference signals are worse than the measurement results of the resources 1 for the side reference signals, but for some reasons, the first terminal does not use the spatial domain transmission filter corresponding to the resource 1 for the side reference signals, at this time, the first terminal may arbitrarily select one spatial domain transmission filter from the spatial domain transmission filters corresponding to the resources 2 for the side reference signals and the resources 3 for the side reference signals as the target spatial domain transmission filter.

Fourth, the indication information is used for indicating the second terminal to receive the side line data by using a first airspace receiving parameter, and the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first side line reference signal.

The target spatial domain receive parameters (also referred to as "target receive beams") may be selected by the beam selection process described above. For example, based on the above-described reception beam selection procedure, the target spatial domain reception parameter may be selected from a plurality of spatial domain reception parameters by the second terminal based on the measurement result. Of course, the target airspace receiving parameters may be selected in other manners, which are not limited in the embodiments of the present application.

The target airspace receiving parameter may be the selected optimal airspace receiving parameter or the selected optimal airspace receiving parameter. The preferred airspace receiving parameter may be understood that a measurement result of the sidestream reference signal received by the airspace receiving parameter is higher than a preset threshold. The predetermined threshold may be, for example, a predetermined received power, a predetermined signal energy, etc. The optimal airspace receiving parameter may be understood as that the measurement result of the sidestream reference signal received by the airspace receiving parameter is better than the measurement result corresponding to the sidestream reference signal received by other airspace receiving parameters supported by the second terminal.

For example, referring to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N sidelink reference signals, the first terminal determines that the measurement result of the resource 1 of the sidelink reference signal is optimal based on the measurement results, where the target airspace reception parameter may be an airspace reception parameter used by the sidelink reference signal corresponding to the resource 1 of the second terminal for receiving the sidelink reference signal.

For another example, referring to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N sideline reference signals, the first terminal determines that the measurement results of the resource 2 of the sideline reference signal and the resource 3 of the sideline reference signal are better based on the measurement results, but the measurement results of the resource 2 of the sideline reference signal and the resource 3 of the sideline reference signal are worse than the measurement results of the resource 1 of the sideline reference signal, but for some reasons, the first terminal does not use the spatial domain transmission parameter corresponding to the resource 1 of the sideline reference signal, and accordingly, the second terminal cannot use the spatial domain reception parameter corresponding to the resource 1 of the sideline reference signal. At this time, the first terminal may arbitrarily select one spatial transmission parameter from the spatial transmission parameters corresponding to the resources 2 and 3 of the sidelink reference signals. It is assumed that the first terminal selects the spatial domain transmission parameter corresponding to the sidelink reference signal resource 2, and indicates the second terminal through the TCI state. Correspondingly, the second terminal receives the sidestream data by using the airspace receiving parameters corresponding to the sidestream reference signal resources 2 according to the TCI state, that is, the airspace receiving parameters corresponding to the sidestream reference signal resources 2 are the target airspace receiving parameters.

It should be noted that, some reasons may include that the transmission condition of the sidestream data changes, so that the airspace receiving parameter corresponding to the resource 1 of the sidestream reference signal is not available. Or, some reasons may further include that the first terminal may send sidestream data to the second terminal and other terminals through other airspace sending filters at the same time, so that the first terminal does not use the airspace sending parameters corresponding to resource 1 of the sidestream reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include a sideline reference signal resource 1 and a sideline reference signal resource 2, the sideline reference signal resources fed back by the third terminal to the first terminal include a sideline reference signal resource 2 and a sideline reference signal resource 3, and the first terminal needs to send sideline data (for example, sideline feedback information) to the second terminal and the third terminal at the same time in a certain time slot, at this time, in order to send sideline data to the second terminal and the third terminal at the same time, the first terminal may select a spatial domain sending parameter corresponding to the reference signal resource 2 to send.

Fifthly, the indication information is used for indicating the first terminal to use a first airspace transmission parameter to transmit the sidestream data, and the first airspace transmission parameter is the same as a target airspace transmission parameter used by the first terminal to transmit the first sidestream reference signal.

The target spatial domain transmission parameters (also referred to as "target transmit beams") may be selected by the beam selection process described above. For example, based on the beam selection procedure described above, the target spatial domain transmission parameter may be selected from a plurality of spatial domain transmission parameters by the second terminal based on the measurement result. For another example, based on the beam selection procedure described above, the target spatial domain transmission parameter may be selected by the first terminal based on the measurement result fed back by the second terminal. Of course, the target airspace transmission parameter may be selected in other manners, which is not limited in the embodiments of the present application.

The target airspace transmission parameter may be the selected optimal airspace transmission parameter or the selected optimal airspace transmission parameter. The preferable airspace transmission parameter may be understood that a measurement result of the sidestream reference signal transmitted by the airspace transmission parameter is higher than a preset threshold. The preset threshold may be, for example, a preset transmit power, a preset signal energy, etc. The optimal airspace transmission parameter may be understood as that a measurement result of the sidestream reference signal transmitted by the airspace transmission parameter is better than a measurement result corresponding to the sidestream reference signal transmitted by other airspace transmission parameters supported by the first terminal.

For example, referring to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N sidelink reference signals, the first terminal determines that the measurement result of the resource 1 of the sidelink reference signal is optimal based on the measurement results, where the target airspace transmission parameter may be an airspace transmission parameter used by the sidelink reference signal corresponding to the resource 1 of the second terminal transmitting the sidelink reference signal.

For another example, referring still to fig. 7, assuming that the second terminal feeds back the measurement results of the resources for the N side reference signals, the first terminal determines that the measurement results of the resources 2 for the side reference signal and the resources 3 for the side reference signal are better based on the measurement results, but the measurement results of the resources 2 for the side reference signal and the resources 3 for the side reference signal are worse than the measurement results of the resources 1 for the side reference signal, but for some reasons, the first terminal does not use the spatial domain transmission parameters corresponding to the resources 1 for the side reference signal, at this time, the first terminal may arbitrarily select one spatial domain transmission parameter from the spatial domain transmission parameters corresponding to the resources 2 for the side reference signal and the resources 3 for the side reference signal as the target spatial domain transmission parameter.

It should be noted that, some reasons may include that the transmission condition of the sidelink data changes, so that the airspace transmission parameter corresponding to the resource 1 of the sidelink reference signal is not available. Or, some reasons may further include that the first terminal may send sidestream data to the second terminal and other terminals through other airspace sending parameters, so that the first terminal does not use the airspace sending parameters corresponding to resource 1 of the sidestream reference signal. For example, the sideline reference signal resources fed back by the second terminal to the first terminal include a sideline reference signal resource 1 and a sideline reference signal resource 2, the sideline reference signal resources fed back by the third terminal to the first terminal include a sideline reference signal resource 2 and a sideline reference signal resource 3, and the first terminal needs to send sideline data (for example, sideline feedback information) to the second terminal and the third terminal at the same time in a certain time slot, at this time, in order to send sideline data to the second terminal and the third terminal at the same time, the first terminal may select a spatial domain sending parameter corresponding to the reference signal resource 2 to send.

6. The indication information is used for indicating the identification of the sidestream reference signal.

Based on the above description, in the process of performing beam selection and beam measurement, the identity of the sideline reference signal transmitted by the first terminal through each transmission beam is different, and therefore, the first terminal may indicate the reception beam to the second terminal by carrying the identity of the sideline reference signal in the indication information. Accordingly, after receiving the identifier of the sidestream reference signal, the second terminal may use the receiving beam for receiving the sidestream reference signal to receive sidestream data sent by the first terminal. The identification of the sideline reference signal may include a resource identification of the sideline reference signal, or an index of the sideline reference signal.

It should be noted that, in other cases, the indication information may also carry QCL type information, such as QCL type D, so as to indicate that the second terminal receives the sideline data by using the same receiving beam (or the spatial receiving parameter or the spatial receiving filter) of the receiving sideline reference signal, and of course, if the second terminal is configured in a pre-configured or predefined manner to obtain the QCL type information corresponding to the indication information, the indication information may also not need to carry the QCL type information.

In the embodiment of the application, the first terminal sends the indication information to the second terminal, so that the second terminal determines the receiving beam matched with the sending beam selected by the first terminal based on the indication information, and the situation that the second terminal cannot select the receiving beam corresponding to the sending beam because the second terminal cannot know the sending beam selected by the first terminal in the traditional side-link communication scene is avoided, thereby being beneficial to improving the communication quality of the side-link.

In some implementations, the indication information may be carried in SCI, MAC CE, or PC 5-radio resource control (radio resource control, PC 5-RRC) signaling.

If the first terminal configures only one TCI state for the second terminal at a time, the reception beam indicated by the TCI state may not be applicable any more when the transmission condition of the signal changes, or the channel quality transmission changes. At this time, a round of beam selection and beam measurement process is required between the first terminal and the second terminal to select a suitable transmit beam and/or receive beam for performing the sidelink communication, so that the sidelink data cannot be immediately transmitted, resulting in a larger transmission delay of the sidelink data.

Therefore, in order to avoid the above-mentioned problem, in the embodiment of the present application, the first terminal may configure the TCI state set 1 through configuration information, and then indicate the first TCI state in the TCI state set 1 through indication information, where the TCI state set 1 includes a plurality of TCI states. Thus, if the current received beam (for example, the received beam indicated by the first TCI state) needs to be adjusted, the first terminal may directly instruct the second terminal to select the received beam indicated by the other TCI states in the TCI state set 1, so as to replace the received beam indicated by the first TCI state, so as to avoid re-executing the beam selection and beam measurement procedures, and reduce the transmission delay of the sideline data.

In some implementations, the set of TCI states 1 described above includes a plurality of TCI states. In some implementations, the set of TCI states 1 described above may include an identification of a plurality of TCI states, indication information of a reference signal associated with each of the plurality of TCI states, and QCL type information. In other implementations, the set of TCI states 1 may include a resource identification of a reference signal associated with each of the plurality of TCI states, and QCL type information. In other implementations, the set of TCI states 1 described above may include an identification of a plurality of TCI states, an identification of a reference signal associated with each of the plurality of TCI states. In other implementations, the set of TCI states 1 described above may include a resource identification of a reference signal associated with each of a plurality of TCI states. The contents of TCI state set 1 will be described below in conjunction with tables 1 through 4. For brevity, the description is omitted here.

In some implementations, the first terminal may configure the set of TCI states 1 by sending configuration information 1 to the second terminal, and indicate to the second terminal which TCI state in the set of TCI states 1 to use.

That is, before the above step S820, the first terminal may transmit the configuration information 1 to the second terminal. Accordingly, the indication information is used for indicating the second terminal to use the first TCI state in the first TCI set. In another embodiment, the indication information is used to indicate that the first TCI state in the first TCI set is activated.

At this time, the above indication information may be an index of the first TCI state in the TCI state set 1. Or the indication information is an identifier of the first TCI state, which is not limited in the embodiment of the present application.

In some implementations, the configuration information 1 is carried in PC5-RRC signaling and the indication information is carried in SCI or MAC CE. Or the configuration information 1 is carried in the MAC CE, and the indication information is carried in the SCI.

In general, in order to facilitate the second terminal to parse the configuration information 1, the configuration information 1 may carry the total number M of TCI states in the TCI state set 1. Of course, the total number of TCI states in the TCI state set 1 may not be carried in the configuration information 1, which is not limited in the embodiment of the present application.

In some implementations, the maximum value of the total number M (or the corresponding number of bits) may be determined by the total number of resources of the sidelink reference signals used in the beam selection and beam measurement process. For example, if the first terminal supports B transmit beams and the second terminal supports a receive beams, the total number of resources of the sidelink reference signal is a×b, that is, m=a×b.

In addition, in the scenario that the terminal supports multiple carriers, TCI states configured on different carriers may be different, so the configuration information 1 further includes an identifier of a side carrier associated with the TCI state set 1 to indicate a carrier corresponding to the first TCI state.

Similarly, when a terminal may communicate on a plurality of side rows BWP, TCI states configured on different side rows BWP may also be different, and thus, the configuration information 1 may further include an identification of the BWP associated with the TCI state set 1 to indicate the side row BWP corresponding to the first TCI state.

The format of configuration information 1 and the contents of TCI state set 1 are described below in connection with fig. 9-12. In fig. 9 to 12, "R" represents a placeholder, and "OCT" represents a byte.

Fig. 9 shows a schematic diagram of the format of configuration information 1 of the embodiment of the present application. It is assumed that the first terminal uses resources of 16 sidelink reference signals in the beam selection and beam measurement procedures. Thus, the resource identification of the sidelink reference signal can be indicated by 4 bits in the configuration information 1. The set of TCI states 1 supports a total of 4 QCL types, then a reservation of 2 bits in configuration information 1 indicates the QCL type contained by each of the first TCI states.

The configuration information 1 may include a total number M of TCI states included in the TCI state set 1, an identification of each TCI state in the TCI state set 1, an identification of a side row reference signal included in each TCI state in the TCI state set 1, and a QCL type included in each TCI state in the TCI state set 1. Wherein, the identification of each TCI state in the TCI state set 1 includes: identification of a first TCI state, identification of a second TCI state, identification of a third TCI state, and identification of a fourth TCI state. The identification of the side row reference signal contained by each TCI state in TCI state set 1 includes: the first TCI state includes an identification of a first reference signal, the second TCI state includes an identification of a second reference signal, the third TCI state includes an identification of a third reference signal, and the fourth TCI state includes an identification of a fourth reference signal.

In general, in order to save the overhead generated by transmitting the configuration information 1, an association relationship between the identity of each TCI state in the set of TCI states 1 and the identity of the side-row reference signal may be predefined or preconfigured at the second terminal. The following description will take fig. 10 as an example.

Fig. 10 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application. It is assumed that the identifications of the 4 TCI states contained in the set of TCI states 1 are numbered sequentially starting from index 0, i.e. the identifications of the 4 TCI states are identification 0, identification 1, identification 2 and identification 3, respectively. In the beam selection and beam measurement process, the first terminal uses the resources of 16 sidelink reference signals. Thus, the resource identification of the sidelink reference signal can be indicated by 4 bits in the configuration information 1. In addition, TCI state set 1 supports 4 QCL types in total, and then 2 bits reserved in configuration information 1 may indicate the QCL types contained in each of the first TCI states.

In order to reduce the overhead generated by transmitting the configuration information 1, the identification of the sideline reference signals associated with the TCI state may be sequentially indexed from the identification 0 according to the identification order of the TCI states in the TCI state set. Namely, the identifier 0 of the TCI state is associated with the identifier of the first side line reference signal, the identifier 1 of the TCI state is associated with the identifier of the second side line reference signal, the identifier 2 of the TCI state is associated with the identifier of the third side line reference signal, and the identifier 3 of the TCI state is associated with the identifier of the fourth side line reference signal.

At this time, the configuration information 1 may include the total number M of TCI states included in the TCI state set 1, an identification of a side row reference signal included in each TCI state in the TCI state set 1, and a QCL type included in each TCI state in the TCI state set 1. The identification of the side row reference signal contained by each TCI state in TCI state set 1 includes: the first TCI state includes an identification of a first reference signal, the second TCI state includes an identification of a second reference signal, the third TCI state includes an identification of a third reference signal, and the fourth TCI state includes an identification of a fourth reference signal.

It should be noted that, the association relationship between the identifier of the TCI state and the identifier of the sidestream reference signal may also be configured in a preconfigured or predefined manner, which is not limited in the embodiment of the present application.

As described above, if QCLs included in the respective TCI states configured by the above configuration information 1 are the same, for example, QCL-type, in order to save the overhead generated by transmitting the configuration information 1, the QCL type may be configured in a predefined or preconfigured manner at the second terminal without being configured by the configuration information 1 again, so as to reduce the overhead generated by transmitting the configuration information 1. The following description will take fig. 11 as an example.

Fig. 11 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application. It is assumed that the first terminal uses resources of 16 sidelink reference signals in the beam selection and beam measurement procedures. Thus, the resource identification of the sidelink reference signal can be indicated by 4 bits in the configuration information 1.

In order to reduce the overhead generated by transmitting the configuration information 1, the QCL type contained in each TCI state in the TCI state set 1 may be preconfigured at the second terminal as the quasi co-located type D.

At this time, the configuration information 1 may include the total number M of TCI states included in the TCI state set 1, and an identification of a side row reference signal included in each TCI state in the TCI state set 1. The identification of the side row reference signal contained in each TCI state in the TCI state set 1 includes: the first TCI state includes an identification of a first reference signal, the second TCI state includes an identification of a second reference signal, the third TCI state includes an identification of a third reference signal, and the fourth TCI state includes an identification of a fourth reference signal.

Of course, in order to further reduce the overhead generated by transmitting the configuration information 1, the QCL type contained in each TCI state in the set of TCI states 1 may be predefined or pre-stored at the second terminal, and the identification of the sideline reference signals associated therewith may be sequentially indexed from the identification 0 in the identification order of the TCI states in the set of TCI states. The following description will take fig. 12 as an example.

Fig. 12 shows a schematic diagram of a format of configuration information 1 according to another embodiment of the present application. It is assumed that the first terminal uses resources of 16 sidelink reference signals in the beam selection and beam measurement procedures. Thus, the resource identification of the sidelink reference signal can be indicated by 4 bits in the configuration information 1. The set of TCI states 1 supports a total of 4 QCL types, then a reservation of 2 bits in configuration information 1 indicates the QCL type contained by each of the first TCI states.

In order to reduce the overhead generated by transmitting the configuration information 1, the QCL type contained in each TCI state in the TCI state set 1 may be preconfigured at the second terminal as the quasi co-located type D. And sequentially indexing the identifications of the side row reference signals associated with the TCI states from identification 0 according to the identification order of the TCI states in the TCI state set. Namely, the identifier 0 of the TCI state is associated with the identifier of the first side line reference signal, the identifier 1 of the TCI state is associated with the identifier of the second side line reference signal, the identifier 2 of the TCI state is associated with the identifier of the third side line reference signal, and the identifier 3 of the TCI state is associated with the identifier of the fourth side line reference signal.

At this time, the configuration information 1 may include the total number M of TCI states included in the TCI state set 1, and the identification of the side row reference signal. The identification of the sideways reference signal comprises identification of a first reference signal, identification of a second reference signal, identification of a third reference signal and identification of a fourth reference signal.

As described above, after receiving the indication information, the second terminal may determine a reception beam used by the reception side line data, which may cause the second terminal to receive the side line data without processing (e.g., demodulating) the indication information if the time domain resource occupied by the indication information is not configured, resulting in a degradation of the quality of the side line communication. For example, referring to fig. 9, in the side-line transmission system, since PSCCH (carrying first-order SCI) and PSSCH (carrying second-order SCI) are transmitted in the same time slot, if the above indication information is carried in the first-order SCI associated with the PSSCH, the second terminal needs time to perform data processing after receiving the PSCCH, which may cause the second terminal to fail to parse the indication information from the first-order SCI in time to determine a reception beam used for receiving the PSSCH associated with the first-order SCI.

Therefore, in order to avoid the above-described problem, a third time interval between the transmission time of the instruction information and the transmission time of the sidestream data may be configured. The third time interval is used to represent a processing time required for the second terminal to acquire QCL information from the received SCI (or MAC CE) and apply it to the reception of the following sidestream data. In some cases, the third time interval may be represented by a number of side row symbols. In other cases, the third time interval may be represented by a number of time slots. For example, the third time interval may be 1 slot (14 symbols), or the third time interval may be defined as 2 slots (28 symbols). The quantization mode of the third time interval is not limited in this embodiment, and the third time interval may also be quantized by using other time domain units.

The third time interval may be defined in a predefined manner for the terminal, and may be preconfigured for the terminal. For example, the third time interval may be defined by the parameter "timeduration forqcl", see fig. 13.

It should be understood that the above-described third time interval may be understood as a time interval between a transmission time of the indication information and a transmission time of the side line data, or a time interval between a reception time of the indication information and a reception time of the side line data, or a time interval between a transmission time of the indication information and a reception time of the side line data, or a time interval between a reception time of the indication information and a transmission time of the side line data. The embodiments of the present application are not limited in this regard.

As introduced above, the second terminal also needs to receive the indication information to determine the first TCI state after receiving the configuration information 1 to configure the TCI state set 1. If the time interval between the transmission of the configuration information 1 and the transmission time of the indication information is too short, there may be a case that the second terminal has not yet received the configuration information 1 to process the configuration information 1 to obtain the TCI state set 1, and the indication information is received, so that the processing of the configuration information 1 fails, and the TCI state set 1 cannot be obtained.

Therefore, in order to avoid the above-described problem, it is possible to configure a first time interval between the transmission time of the indication information and the transmission time of the configuration information 1 to be greater than or equal to a first threshold. Or, the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the configuration information 1 and the first time interval.

The first time interval between the transmission time of the instruction information and the transmission time of the configuration information 1 may be understood as a time interval between the transmission time of the instruction information and the transmission time of the configuration information 1, or a time interval between the reception time of the instruction information and the reception time of the configuration information 1, or a time interval between the transmission time of the instruction information and the reception time of the configuration information 1, or a time interval between the reception time of the instruction information and the transmission time of the configuration information 1. The embodiments of the present application are not limited in this regard.

It should be appreciated that the first threshold or first time interval described above may be configured in one or more of the following ways: the pre-configuration, the pre-defined, the network configuration, is indicated by the first terminal, or by the second terminal.

As described above, when the first terminal configures the TCI state set for the second terminal, it is further required to send indication information to the second terminal to indicate which TCI state in the TCI state set is used by the second terminal. In this case, if the number of TCI states included in the set of TCI states configured by the first terminal for the second terminal is greater, bits reserved in the indication information will also be greater, resulting in an increase in overhead for transmitting the indication information. For example, when the set of TCI states includes 4 TCI states, 2 bits need to be reserved in the indication information to indicate the TCI state used by the second terminal. When the set of TCI states includes 16 TCI states, 4 bits need to be reserved in the indication information to indicate the TCI state used by the second terminal.

Thus, in order to avoid the above-mentioned problem, after the first terminal configures the TCI state set 1 for the second terminal, the second terminal may be reconfigured to activate only a subset of the TCI state set 1, i.e., the TCI state set 2. The first terminal may thus indicate the TCI state (first TCI state) used by the second terminal from the set of TCI states 2 by means of the indication information. Because the TCI state set 2 is a subset of the TCI state set 1, the probability that the indication information indicates the second terminal to use the TCI state is reduced, which is beneficial to reducing reserved bits in the indication information and reducing the overhead of transmitting the indication information.

It should be noted that, in the embodiment of the present application, the scheme for configuring the TCI state set 1 for the second terminal may refer to the scheme for configuring the TCI state set 1 above, and for brevity, the following description will not be repeated, and mainly describes how to configure the TCI state set 2 (i.e. subset) for the second terminal.

In some implementations, the first terminal may configure the TCI state set 2 for the second terminal by sending the configuration information 2. In some implementations, the configuration information 2 may include TCI state identification information indicating an identification of an activated TCI state in the TCI state set 1. In other implementations, the configuration information 2 may further include a bitmap, where a length of the bitmap may be determined according to a total number of TCI states in the TCI state set 1. If the bit in the bit map takes the first value to indicate that the TCI state corresponding to the bit belongs to the TCI state set 2. If the bit in the bit map takes the second value, it indicates that the TCI state corresponding to the bit does not belong to the TCI state set 2, where the first value is different from the second value.

The length of the bit map is determined according to the total number of TCI states in the TCI state set 1, which may include that the length of the bit map is the same as the total number of TCI states in the TCI state set 1, or that the number of bits in the bit map is equal to the total number of TCI states in the TCI state set 1. At this time, each bit in the bit map corresponds to one TCI state in the set of TCI states 1. Of course, the number of bits in the bit map may also be an integer multiple, e.g., 2 times, the total number of TCI states in TCI state set 1, such that every 2 bits in the bit map corresponds to one TCI state in TCI state set 1. This is not limiting in this application example.

In general, to facilitate the second terminal to parse the configuration information 2, the configuration information 2 may carry the total number P of TCI states in the set of TCI states 2. Of course, the total number P of TCI states in the TCI state set 2 may not be carried in the configuration information 2, which is not limited in the embodiment of the present application.

The contents contained in the configuration information 2 will be described below with reference to fig. 14 to 15, respectively. In fig. 14 to 15, "R" represents a placeholder, and "OCT" represents a byte.

Fig. 14 is a schematic diagram of a format of configuration information 2 of the embodiment of the present application. Suppose TCI state set 1 includes 16 TCI states. Thus, the identification of the TCI state may be indicated by 4 bits in configuration information 2. And, 4 TCI states in the TCI state set 1 need to be activated as the TCI state set 2 by the configuration information 2.

In this case, configuration information 2 may carry the total number of TCI state sets 2, as well as the identification of 4 TCI states in TCI state set 2. The identifier of the TCI state carried by the configuration information 2 includes: identification of a first TCI state, identification of a second TCI state, identification of a third TCI state, and identification of a fourth TCI state.

Fig. 15 is a schematic diagram of a format of configuration information 2 according to another embodiment of the present application. Suppose TCI state set 1 includes 16 TCI states. Thus, it is possible to indicate in the configuration information 2 whether the TCI state belongs to the TCI state set 2 by a bit map containing 16 bits (T0 to T15). And, 4 TCI states therein need to be activated as the TCI state set 2 through the configuration information 2.

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

In this case, when the TCI state that configuration information 2 needs to activate is the TCI state identified as 0-3, only bits T0-T3 in the bit map need be set to a first value (e.g., 1) to indicate that the TCI state identified as 0-3 belongs to TCI state set 2. The remaining bits T4-T15 are set to a second value (e.g., 0) to indicate that the TCI states identified as 4-15 do not belong to TCI state set 2.

It should be noted that, in the above examples, only the correspondence between the identifier and the bit of the TCI state is listed, and the identifier and the bit of the TCI state may also be corresponding in other manners, which is not limited in the embodiments of the present application.

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

In other implementations, if the configuration information 1 is carried in the PC5-RRC signaling, the configuration information 2 may be carried in the first MAC CE, and the indication information may be carried in the second MAC CE.

In other implementations, if the configuration information 1 is carried in the PC5-RRC signaling, the configuration information 2 may be carried in the first SCI, and the indication information may be carried in the second SCI.

As introduced above, the second terminal needs to receive configuration information 2 to determine TCI state set 2 after receiving configuration information 1 to configure TCI state set 1. If the time interval between the transmission of the configuration information 1 and the transmission time of the configuration information 2 is too short, there may be a case that the second terminal has not yet received the configuration information 1 to process the configuration information 1 to obtain the TCI state set 1, and the configuration information 2 is received, so that the processing of the configuration information 1 fails, and the TCI state set 1 cannot be obtained.

Therefore, in order to avoid the above-described problem, a second time interval between the transmission time of the configuration information 2 and the transmission time of the configuration information 1 may be set to be greater than or equal to a second threshold. Or, the time domain resource occupied by the configuration information 2 is not earlier than the second time domain resource, wherein the second time domain resource is determined according to the time domain resource occupied by the configuration information 1 and the second time interval.

The second time interval between the transmission time of the configuration information 2 and the transmission time of the configuration information 1 may be understood as a time interval between the transmission time of the configuration information 2 and the transmission time of the configuration information 1, or a time interval between the reception time of the configuration information 2 and the reception time of the configuration information 1, or a time interval between the transmission time of the configuration information 2 and the reception time of the configuration information 1, or a time interval between the reception time of the configuration information 2 and the transmission time of the configuration information 1. The embodiments of the present application are not limited in this regard.

It should be appreciated that the second threshold or second time interval described above may be configured in one or more of the following ways: the pre-configuration, the pre-defined, the network configuration, is indicated by the first terminal, or by the second terminal.

In the embodiment of the present application, the second terminal receives the indication information to determine the first TCI state after receiving the configuration information 2 to configure the TCI state set 2. If the time interval between transmission of the indication information and the transmission time of the configuration information 2 is too short, there may be a situation that the second terminal has not yet received the processing of the configuration information 2 to obtain the TCI state set 2, and the indication information is received, so that the processing of the configuration information 2 fails, and the TCI state set 2 cannot be obtained.

Therefore, in order to avoid the above-described problem, a fourth time interval between the transmission time of the configuration information 2 and the transmission time of the instruction information may be configured to be greater than or equal to the third threshold. Or, the time domain resource occupied by the indication information is not earlier than the third time domain resource, wherein the third time domain resource is determined according to the time domain resource occupied by the configuration information 2 and a fourth time interval, and the fourth time interval is a time interval between the transmission time of the configuration information 2 and the transmission time of the indication configuration information.

The fourth time interval may be understood as a time interval between the transmission time of the configuration information 2 and the transmission time of the instruction information, or a time interval between the reception time of the configuration information 2 and the reception time of the instruction information, or a time interval between the transmission time of the configuration information 2 and the reception time of the instruction information, or a time interval between the reception time of the configuration information 2 and the transmission time of the instruction information. The embodiments of the present application are not limited in this regard.

It should be appreciated that the third threshold or fourth time interval described above may be configured in one or more of the following ways: the pre-configuration, the pre-defined, the network configuration, is indicated by the first terminal, or by the second terminal.

As described above, the first terminal may configure the TCI state set 1 for the second terminal by sending the configuration information 1 and/or configure the TCI state set 2 for the second terminal by sending the configuration information 2, but in some cases, the first terminal may not know whether the second terminal receives the corresponding configuration information, and thus may activate side feedback so that the second terminal feeds back the reception result to the first terminal, so that the first terminal determines whether the second terminal receives the corresponding configuration information. For example, when the configuration information 1 and the configuration information 2 are transmitted through the MAC CE, the second terminal may be activated to perform sidestream feedback.

In other cases, when the first terminal sends the indication information to the second terminal device, the first terminal may not know whether the second terminal device receives the indication information, so that the second terminal device may be activated to perform lateral feedback, so that the second terminal feeds back a receiving result to the first terminal, so that the first terminal determines whether the second terminal receives the indication information. For example, when the above indication information is transmitted through SCI or MAC CE, the second terminal may be activated to perform sidestream feedback.

The transmission resources occupied by the second terminal for lateral feedback may be described with reference to fig. 4, for example, the transmission resources are carried in the PSFCH. Of course, it is also redefined, and the embodiments of the present application are not limited thereto.

It should be appreciated that in the above embodiments configuring TCI state set 1 and TCI state set 2, "configuration information 1" may also be referred to as "second configuration information", "configuration information 2" may also be referred to as "first configuration information", "TCI state set 1" may also be referred to as "second TCI state set", and "TCI state set 2" may also be referred to as "first TCI state set". In an embodiment where only TCI state set 1 is configured, "configuration information 1" may also be referred to as "first configuration information" and "TCI state set 1" may also be referred to as "first TCI state set".

Method embodiments of the present application are described above in detail in connection with fig. 1-15, and apparatus embodiments of the present application are described below in detail in connection with fig. 16-18. It is to be understood that the description of the method embodiments corresponds to the description of the device embodiments, and that parts not described in detail can therefore be seen in the preceding method embodiments.

Fig. 16 is a schematic diagram of a first terminal according to an embodiment of the present application. The first terminal 1600 shown in fig. 16 includes a generating unit 1610 and a transmitting unit 1620.

A generating unit 1610 configured to generate indication information;

and a transmitting unit 1620 configured to transmit the indication information to the second terminal.

The indication information is used for indicating a first transmission configuration to indicate a TCI state, or the indication information is used for indicating the second terminal to receive side line data by using a first airspace receiving filter, the first airspace receiving filter is used for the second terminal to receive a target airspace receiving filter used by a first side line reference signal, or the indication information is used for indicating the first terminal to transmit the side line data by using a first airspace transmitting filter, the first airspace transmitting filter is used for indicating the first terminal to transmit a target airspace transmitting filter used by a first side line reference signal, or the indication information is used for indicating the second terminal to receive the side line data by using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first side line reference signal, or the indication information is used for indicating the first terminal to transmit the side line data by using a first airspace transmitting parameter, and the first airspace transmitting parameter is the same as a target airspace transmitting parameter used by the first terminal to transmit the first side line reference signal.

Optionally, the reference signal included in the first TCI state is the first side line reference signal, and/or the quasi co-sited QCL type included in the first TCI state is the quasi co-sited type D.

Optionally, the indication information is carried in sidestream control information SCI, medium access control unit MAC CE or PC 5-radio resource control PC5-RRC signaling.

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

Optionally, the indication information is an identification of the first TCI state in the first TCI state set.

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

Optionally, the first configuration information includes a total number of TCI states in the first set of TCI states.

Optionally, the first configuration information further includes an identification of a side row carrier associated with the first TCI state set, and/or an identification of a side row bandwidth portion BWP associated with the first TCI state set.

Optionally, the TCI state in the first set of TCI states includes at least one of an identification of the TCI state, indication information of a reference signal associated with the TCI state, and QCL type information.

Optionally, a first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and the first time interval.

Optionally, the first threshold or the first time interval is configured according to one or more of: pre-configured, predefined, network configuration, indicated by the first terminal, or indicated by the second terminal.

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

Optionally, the sending unit 1620 is further configured to send second configuration information to the second terminal, where the second configuration information is used to configure a second TCI state set, and the first TCI state set is a subset of the second TCI state set.

Optionally, the first configuration information includes a bitmap, and a length of the bitmap is determined according to a total number of TCI states in the second TCI state set.

Optionally, a bit in the bit map takes a first value to indicate that a TCI state corresponding to the bit belongs to the first TCI state set; and taking a second value by a bit in the bit map to indicate that the TCI state corresponding to the bit does not belong to the first TCI state set, wherein the first value is different from the second value.

Optionally, a second time interval between the transmission time of the first configuration information and the transmission time of the second configuration information is greater than or equal to a second threshold; or, the time domain resource of the first configuration information is not earlier than a second time domain resource, wherein the second time domain resource is determined according to the time domain resource of the second configuration information and the second time interval.

Optionally, the second threshold or the second time interval is configured by one or more of: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.

Optionally, the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.

Fig. 17 is a schematic diagram of a second terminal according to an embodiment of the present application. The second terminal 1700 shown in fig. 17 includes a receiving unit 1710 and a transmitting unit 1720.

A receiving unit 1710, configured to receive indication information sent by the first terminal;

a transmitting unit 1720, configured to receive the sidestream data sent by the first terminal based on the indication information.

The indication information is used for indicating a first transmission configuration to indicate a TCI state, or the indication information is used for indicating the second terminal to receive the side-row data by using a first airspace receiving filter, the first airspace receiving filter is used for indicating the second terminal to receive a target airspace receiving filter used by a first side-row reference signal, or the indication information is used for indicating the first terminal to transmit the side-row data by using a first airspace transmitting filter, the first airspace transmitting filter is used for indicating the first terminal to transmit a target airspace transmitting filter used by a first side-row reference signal, or the indication information is used for indicating the second terminal to receive the side-row data by using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive the first side-row reference signal, or the indication information is used for indicating the first terminal to transmit the side-row data by using a first airspace transmitting parameter, and the first airspace transmitting parameter is the same as a target airspace transmitting parameter used by the first terminal to transmit the first side-row reference signal.

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

Optionally, a first time interval between the transmission time of the indication information and the transmission time of the first configuration information is greater than or equal to a first threshold; or the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and a first time interval.

Optionally, the receiving unit 1710 is further configured to receive second configuration information sent by the first terminal, where the second configuration information is used to configure a second TCI state set, and the first TCI state set is a subset of the second TCI state set.

Fig. 18 is a schematic structural diagram of a communication apparatus of an embodiment of the present application. The dashed lines in fig. 18 indicate that the unit or module is optional. The apparatus 1800 may be used to implement the methods described in the method embodiments above. The apparatus 1800 may be a chip, a terminal device, or a network device.

The apparatus 1800 may include one or more processors 1810. The processor 1810 may support the apparatus 1800 to implement the methods described in the method embodiments above. The processor 1810 may be a general purpose processor or a special purpose processor. For example, the processor may be a central processing unit (central processing unit, CPU). Alternatively, the processor may be another general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The apparatus 1800 may also include one or more memories 1820. The memory 1820 has stored thereon a program that can be executed by the processor 1810 to cause the processor 1810 to perform the methods described in the method embodiments above. The memory 1820 may be separate from the processor 1810 or may be integrated within the processor 1810.

The apparatus 1800 may also include a transceiver 1830. The processor 1810 may communicate with other devices or chips through a transceiver 1830. For example, the processor 1810 may transmit and receive data to and from other devices or chips through the transceiver 1830.

The embodiment of the application also provides a computer readable storage medium for storing a program. The computer-readable storage medium may be applied to a terminal or a network device provided in embodiments of the present application, and the program causes a computer to execute the method performed by the terminal or the network device in the respective embodiments of the present application.

Embodiments of the present application also provide a computer program product. The computer program product includes a program. The computer program product may be applied to a terminal or a network device provided in embodiments of the present application, and the program causes a computer to perform the methods performed by the terminal or the network device in the embodiments of the present application.

The embodiment of the application also provides a computer program. The computer program may be applied to a terminal or a network device provided in embodiments of the present application, and cause a computer to perform the methods performed by the terminal or the network device in the embodiments of the present application.

The terms "system" and "network" may be used interchangeably herein. In addition, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The terms "first," "second," "third," and "fourth" and the like in the description and in the claims of this application and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiment of the present application, the "indication" may be a direct indication, an indirect indication, or an indication having an association relationship. For example, a indicates B, which may mean that a indicates B directly, e.g., B may be obtained by a; it may also indicate that a indicates B indirectly, e.g. a indicates C, B may be obtained by C; it may also be indicated that there is an association between a and B.

In the embodiments of the present application, the term "corresponding" may indicate that there is a direct correspondence or an indirect correspondence between the two, or may indicate that there is an association between the two, or may indicate a relationship between the two and the indicated, configured, or the like.

In the embodiment of the present application, the "pre-defining" or "pre-configuring" may be implemented by pre-storing a corresponding code, a table or other manners that may be used to indicate relevant information in a device (including, for example, a terminal device and a network device), and the specific implementation manner is not limited in this application. Such as predefined may refer to what is defined in the protocol.

In the embodiment of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, may include an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited in this application.

In the embodiments of the present application, determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

In the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, which indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In various embodiments of the present application, the sequence number of each process does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital versatile disk (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of communication, comprising:

the first terminal generates indication information;

the first terminal transmits the indication information to the second terminal,

wherein the indication information is used for indicating that the first transmission configuration indicates the TCI state, or

The indication information is used for indicating the second terminal to use a first airspace receiving filter to receive the sidestream data, the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first sidestream reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission filter to transmit the sidestream data, and the first airspace transmission filter is used for the first terminal to transmit a target airspace transmission filter used by a first sidestream reference signal, or

The indication information is used for indicating the second terminal to use a first airspace receiving parameter to receive the sidestream data, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive a first lateral reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission parameter to transmit the sidestream data, and the first airspace transmission parameter is the same as a target airspace transmission parameter used by the first terminal to transmit a first sidestream reference signal.
The method of claim 1, wherein the reference signal included in the first TCI state is the first side row reference signal and/or the quasi co-sited QCL type included in the first TCI state is QCL type D.
The method according to claim 1 or 2, characterized in that the indication information is carried in sidestream control information SCI, medium access control element MAC CE or PC 5-radio resource control PC5-RRC signaling.
A method according to any of claims 1-3, wherein the first TCI state belongs to a first set of TCI states, the indication information indicating that the second terminal uses the first TCI state of the first set of TCI states.
The method of claim 4, wherein the indication information is an identification of the first TCI state in the first set of TCI states.
The method of claim 4 or 5, wherein the method further comprises:

the first terminal sends first configuration information to the second terminal, wherein the first configuration information is used for configuring the first TCI state set.
The method of claim 6, wherein the first configuration information comprises a total number of TCI states in the first set of TCI states.
The method of claim 6 or 7, wherein the first configuration information further comprises an identification of a side row carrier associated with the first TCI state set and/or an identification of a side row bandwidth portion BWP associated with the first TCI state set.
The method of any of claims 4-8, wherein a TCI state in the first set of TCI states includes at least one of an identification of a TCI state, indication information of a reference signal associated with a TCI state, and QCL type information.
The method of any of claims 6-9, wherein a first time interval between a transmission time of the indication information and a transmission time of the first configuration information is greater than or equal to a first threshold; or alternatively, the first and second heat exchangers may be,

The time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and the first time interval.
The method of claim 10, wherein the first threshold or the first time interval is configured according to one or more of: pre-configured, predefined, network configuration, indicated by the first terminal, or indicated by the second terminal.
The method according to any of claims 6-11, wherein the first configuration information is carried in PC5-RRC signaling and the indication information is carried in SCI or MAC CE, or

The first configuration information is carried in the MAC CE and the indication information is carried in the SCI.
The method of any one of claims 6-11, wherein the method further comprises:

the first terminal sends second configuration information to the second terminal, wherein the second configuration information is used for configuring a second TCI state set, and the first TCI state set is a subset of the second TCI state set.
The method of claim 13, wherein,

The first configuration information includes a bit map having a length determined according to a total number of TCI states in the second set of TCI states.
The method of claim 14, wherein a bit in the bit map takes a first value to indicate that a TCI state corresponding to the bit belongs to the first set of TCI states;

and taking a second value by a bit in the bit map to indicate that the TCI state corresponding to the bit does not belong to the first TCI state set, wherein the first value is different from the second value.
The method of any of claims 13-15, wherein a second time interval between a transmission time of the first configuration information and a transmission time of the second configuration information is greater than or equal to a second threshold; or (b)

The time domain resource of the first configuration information is not earlier than a second time domain resource, wherein the second time domain resource is determined according to the time domain resource of the second configuration information and the second time interval.
The method of claim 16, wherein the second threshold or the second time interval is configured by one or more of: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.
The method according to any of claims 13-17, wherein the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in a MAC CE, and the indication information is carried in a SCI.
A method of communication, comprising:

the second terminal receives the indication information sent by the first terminal;

the second terminal receives the sidestream data sent by the first terminal based on the indication information,

wherein the indication information is used for indicating that the first transmission configuration indicates the TCI state, or

The indication information is used for indicating the second terminal to use a first airspace receiving filter to receive the sidestream data, the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first sidestream reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission filter to transmit the sidestream data, the first airspace transmission filter is a target airspace transmission filter used by the first terminal to transmit a first sidestream reference signal, or

The indication information is used for indicating the second terminal to receive the sidestream data by using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive a first airspace reference signal, or

The indication information is used for indicating the first terminal to send the sidestream data by using a first airspace sending parameter, and the first airspace transmission parameter is the same as a target airspace sending parameter used by the first terminal to send a first sidestream reference signal.
The method of claim 19, wherein the reference signal included in the first TCI state is the first side row reference signal and/or the quasi co-sited QCL type included in the first TCI state is QCL type D.
The method according to claim 19 or 20, characterized in that the indication information is carried in sidestream control information SCI, medium access control element MAC CE or PC 5-radio resource control PC5-RRC signaling.
The method of any of claims 19-21, wherein the first TCI state belongs to a first set of TCI states, the indication information indicating that the second terminal uses the first TCI state in the first set of TCI states.
The method of claim 22, wherein the indication information is an identification of the first TCI state in the first set of TCI states.
The method of claim 22 or 23, wherein the method further comprises:

The second terminal receives first configuration information sent by the first terminal, wherein the first configuration information is used for configuring the first TCI state set.
The method of claim 24, wherein the first configuration information comprises a total number of TCI states in the first set of TCI states.
The method of claim 24 or 25, wherein the first configuration information further comprises an identification of a side row carrier associated with the first TCI state set and/or an identification of a side row bandwidth portion BWP associated with the first TCI state set.
The method of any of claims 22-26, wherein a TCI state in the first set of TCI states comprises at least one of an identification of a TCI state, indication information of a reference signal associated with a TCI state, and QCL type information.
The method of any of claims 24-27, wherein a first time interval between a transmission time of the indication information and a transmission time of the first configuration information is greater than or equal to a first threshold; or alternatively, the first and second heat exchangers may be,

the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and the first time interval.
The method of claim 28, wherein the first threshold or the first time interval is configured according to one or more of: pre-configured, predefined, network configuration, indicated by the first terminal, or indicated by the second terminal.
The method according to any of claims 24-29, wherein the first configuration information is carried in PC 5-radio resource control, PC5-RRC, signaling and the indication information is carried in sidestream control information, SCI, or medium access control unit, MAC CE, or

The first configuration information is carried in the MAC CE and the indication information is carried in the SCI.
The method of any one of claims 24-29, wherein the method further comprises:

the second terminal receives second configuration information sent by the first terminal, wherein the second configuration information is used for configuring a second TCI state set, and the first TCI state set is a subset of the second TCI state set.
The method of claim 31, wherein the first configuration information comprises a bit map having a length determined based on a total number of TCI states in the second set of TCI states.
The method of claim 32, wherein a bit in the bit map takes a first value to indicate that a TCI state corresponding to the bit belongs to the first set of TCI states;

and taking a second value by a bit in the bit map to indicate that the TCI state corresponding to the bit does not belong to the first TCI state set, wherein the first value is different from the second value.
The method of any of claims 31-33, wherein a second time interval between a transmission time of the first configuration information and a transmission time of the second configuration information is greater than or equal to a second threshold; or (b)

The time domain resource of the first configuration information is not earlier than a second time domain resource, wherein the second time domain resource is determined according to the time domain resource of the second configuration information and the second time interval.
The method of claim 34, wherein the second threshold or the second time interval is configured by one or more of: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.
The method according to any of claims 31-35, wherein the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in a MAC CE, and the indication information is carried in a SCI.
A first terminal, comprising:

a generation unit configured to generate instruction information;

a transmitting unit configured to transmit the indication information to the second terminal,

wherein the indication information is used for indicating that the first transmission configuration indicates the TCI state, or,

the indication information is used for indicating the second terminal to use a first airspace receiving filter to receive the sidestream data, the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first sidestream reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission filter to transmit the sidestream data, and the first airspace transmission filter is used for the first terminal to transmit a target airspace transmission filter used by a first sidestream reference signal, or

The indication information is used for indicating the second terminal to use a first airspace receiving parameter to receive the sidestream data, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive a first lateral reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission parameter to transmit the sidestream data, and the first airspace transmission parameter is the same as a target airspace transmission parameter used by the first terminal to transmit a first sidestream reference signal.
The first terminal of claim 37, wherein the reference signal included in the first TCI state is the first side row reference signal and/or the quasi co-sited QCL type included in the first TCI state is QCL type D.
The first terminal according to claim 37 or 38, characterized in that the indication information is carried in sidestream control information SCI, medium access control unit MAC CE or PC 5-radio resource control PC5-RRC signaling.
The first terminal of any of claims 37-39, wherein the first TCI state belongs to a first set of TCI states, the indication information indicating that the second terminal uses the first TCI state in the first set of TCI states.
The first terminal of claim 40, wherein the indication information is an identification of the first TCI state in the first set of TCI states.
The first terminal of claim 40 or 41, wherein the transmitting unit is further configured to:

and sending first configuration information to the second terminal, wherein the first configuration information is used for configuring the first TCI state set.
The first terminal of claim 42, wherein the first configuration information includes a total number of TCI states in the first set of TCI states.
The first terminal of claim 42 or 43, wherein the first configuration information further comprises an identification of a side row carrier associated with the first TCI state set and/or an identification of a side row bandwidth portion BWP associated with the first TCI state set.
The first terminal of any of claims 40-44, wherein a TCI state in the first set of TCI states includes at least one of an identification of a TCI state, indication information of a reference signal associated with a TCI state, and QCL type information.
The first terminal of any of claims 42-45, wherein a first time interval between a transmission time of the indication information and a transmission time of the first configuration information is greater than or equal to a first threshold; or alternatively, the first and second heat exchangers may be,

the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and the first time interval.
The first terminal of claim 46, wherein the first threshold or the first time interval is configured according to one or more of: pre-configured, predefined, network configuration, indicated by the first terminal, or indicated by the second terminal.
The first terminal of any of claims 42-47, wherein the first configuration information is carried in PC5-RRC signaling and the indication information is carried in SCI or MAC CE, or

The first configuration information is carried in the MAC CE and the indication information is carried in the SCI.
The first terminal according to any of the claims 42-47, wherein the sending unit is further configured to:

and sending second configuration information to the second terminal, wherein the second configuration information is used for configuring a second TCI state set, and the first TCI state set is a subset of the second TCI state set.
The first terminal of claim 49, wherein the first configuration information comprises a bit map having a length determined based on a total number of TCI states in the second set of TCI states.
The first terminal of claim 50, wherein bits in the bit map take a first value indicating that a TCI state corresponding to the bits belongs to the first set of TCI states;

and taking a second value by a bit in the bit map to indicate that the TCI state corresponding to the bit does not belong to the first TCI state set, wherein the first value is different from the second value.
The first terminal of any of claims 49-51, wherein a second time interval between a transmission time of the first configuration information and a transmission time of the second configuration information is greater than or equal to a second threshold; or (b)

The time domain resource of the first configuration information is not earlier than a second time domain resource, wherein the second time domain resource is determined according to the time domain resource of the second configuration information and the second time interval.
The first terminal of claim 52, wherein the second threshold or the second time interval is configured by one or more of: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.
The first terminal of any of claims 49-53, wherein the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in a MAC CE, and the indication information is carried in a SCI.
A second terminal, comprising:

the receiving unit is used for receiving the indication information sent by the first terminal;

a transmitting unit for receiving sidestream data transmitted by the first terminal based on the indication information,

Wherein the indication information is used for indicating that the first transmission configuration indicates the TCI state, or

The indication information is used for indicating the second terminal to use a first airspace receiving filter to receive the sidestream data, the first airspace receiving filter is a target airspace receiving filter used by the second terminal to receive a first sidestream reference signal, or

The indication information is used for indicating the first terminal to use a first airspace transmission filter to transmit the sidestream data, the first airspace transmission filter is a target airspace transmission filter used by the first terminal to transmit a first sidestream reference signal, or

The indication information is used for indicating the second terminal to receive the sidestream data by using a first airspace receiving parameter, the first airspace receiving parameter is the same as a target airspace receiving parameter used by the second terminal to receive a first airspace reference signal, or

The indication information is used for indicating the first terminal to send the sidestream data by using a first airspace sending parameter, and the first airspace transmission parameter is the same as a target airspace sending parameter used by the first terminal to send a first sidestream reference signal.
The second terminal of claim 55, wherein the reference signal included in the first TCI state is the first side row reference signal and/or the quasi co-sited QCL type included in the first TCI state is QCL type D.
The second terminal according to claim 55 or 56, wherein said indication information is carried in sidestream control information SCI, medium access control element MAC CE or PC 5-radio resource control PC5-RRC signaling.
The second terminal of any of claims 55-57, wherein the first TCI state belongs to a first set of TCI states, the indication information indicating that the second terminal uses the first TCI state in the first set of TCI states.
The second terminal of claim 58, wherein the indication information is an identification of the first TCI state in the first set of TCI states.
The second terminal according to claim 58 or 59, wherein the receiving unit is further configured to:

and receiving first configuration information sent by the first terminal, wherein the first configuration information is used for configuring the first TCI state set.
The second terminal of claim 60, wherein the first configuration information includes a total number of TCI states in the first set of TCI states.
The second terminal of claim 60 or 61, wherein the first configuration information further comprises an identification of a side row carrier associated with the first TCI state set and/or an identification of a side row bandwidth portion BWP associated with the first TCI state set.
The second terminal of any of claims 58-62, wherein a TCI state in the first set of TCI states includes at least one of an identification of a TCI state, indication information of a reference signal associated with a TCI state, and QCL type information.
The second terminal according to any of the claims 60-63, wherein a first time interval between a transmission time of the indication information and a transmission time of the first configuration information is greater than or equal to a first threshold; or alternatively, the first and second heat exchangers may be,

the time domain resource occupied by the indication information is not earlier than the first time domain resource, wherein the first time domain resource is determined according to the time domain resource occupied by the first configuration information and a first time interval.
The second terminal of claim 64, wherein the first threshold or the first time interval is configured according to one or more of: pre-configured, predefined, network configuration, indicated by the first terminal, or indicated by the second terminal.
The second terminal according to any of the claims 60-65, wherein the first configuration information is carried in PC5-RRC signaling and the indication information is carried in SCI or MAC CE, or

The first configuration information is carried in the MAC CE and the indication information is carried in the SCI.
The second terminal according to any of the claims 60-65, wherein the receiving unit is further adapted to:

and receiving second configuration information sent by the first terminal, wherein the second configuration information is used for configuring a second TCI state set, and the first TCI state set is a subset of the second TCI state set.
The second terminal of claim 67, wherein the first configuration information comprises a bitmap, a length of the bitmap determined based on a total number of TCI states in the second set of TCI states.
The second terminal of claim 68, wherein bits in said bit map take a first value indicating that the TCI state to which said bits correspond belongs to said first set of TCI states;

and taking a second value by a bit in the bit map to indicate that the TCI state corresponding to the bit does not belong to the first TCI state set, wherein the first value is different from the second value.
The second terminal according to any of the claims 67-69, wherein a second time interval between a transmission time of the first configuration information and a transmission time of the second configuration information is greater than or equal to a second threshold; or (b)

The time domain resource of the first configuration information is not earlier than a second time domain resource, wherein the second time domain resource is determined according to the time domain resource of the second configuration information and the second time interval.
The second terminal of claim 70, wherein the second threshold or the second time interval is configured by one or more of: pre-configured, predefined, network configuration information, indicated by the first terminal, and indicated by the second terminal.
The second terminal according to any of the claims 67-71, wherein the second configuration information is carried in PC5-RRC signaling, the first configuration information is carried in MAC CE, and the indication information is carried in SCI.
A terminal comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method of any of claims 1-36.
An apparatus comprising a processor configured to invoke a program from memory to perform the method of any of claims 1-36.
A chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of any one of claims 1-36.
A computer-readable storage medium, having stored thereon a program that causes a computer to perform the method of any of claims 1-36.
A computer program product comprising a program for causing a computer to perform the method of any one of claims 1-36.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1-36.