Signal transmission method, device and terminal

Abstract

Provided are a signal transmission method, device and terminal, the method being executed by the terminal, the method comprising: acquiring a transmission configuration indication (TCI) state corresponding to a target signal on a straight-through link, the TCI state being used for indicating a quasi common site (QCL) relationship of the target signal; and transmitting the target signal according to the TCI state. According to the scheme, the transmission related information of the target signal is acquired based on the TCI state corresponding to the target signal on the straight-through link, so that the signaling overhead of the terminal of the straight-through link and the decoding burden of the terminal can be reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a signal transmission method, device and terminal. Background Art

[0002] Quasi Co-Location (QCL) means that the large-scale channel parameters experienced by the symbols on a certain antenna port can be inferred from the symbols on another antenna port, where the large-scale channel parameters may include delay spread, average delay, Doppler spread, Doppler shift, average gain and spatial reception parameters. Usually, the QCL source signal is sent periodically, and the user equipment (UE) can continuously track and measure it to obtain accurate large-scale parameter estimation for the reception of the target reference signal. In order to configure the QCL relationship between reference signals, the New Radio (NR) introduces the Transmission Configuration Indicator (TCI) transmission configuration indication.

[0003] With the deepening of the research on sidelink (SL), beamforming technology has been included in the scope of SL technology. QCL technology can assist UE in fast channel estimation and use corresponding large-scale parameters to design channel estimation filter parameters to adapt to the channel propagation characteristics of different beams, which can ensure the reception performance. How to implement QCL technology in SL is an urgent problem to be solved. Summary of the invention

[0004] Embodiments of the present application provide a signal transmission method, device, and terminal to reduce the signaling overhead and terminal decoding burden of a terminal in direct link communication.

[0005] In order to solve the above technical problems, an embodiment of the present application provides a signal transmission method, which is executed by a terminal, including:

[0006] Acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-location QCL relationship of the target signal;

[0007] The target signal is transmitted according to the TCI state.

[0008] Optionally, before acquiring the transmission configuration indication TCI state corresponding to the target signal, the method further includes:

[0009] A TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

[0010] Optionally, the acquiring of a transmission configuration indication TCI state corresponding to a target signal on the through link includes at least one of the following:

[0011] Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE;

[0012] The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

[0013] Optionally, the transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information includes:

[0014] Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal;

[0015] receiving a TCI state corresponding to a target signal on a through link indicated by control information;

[0016] The TCI state corresponding to the target signal is one of the candidate TCI states.

[0017] Optionally, before the TCI state corresponding to at least one direct link signal configured by the receiving radio resource control RRC signaling, the method further includes:

[0018] Based on the target QCL relationship, receiving a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH;

[0019] The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

[0020] Optionally, the format of the TCI status includes at least one of the following formats:

[0021] Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal;

[0022] Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal;

[0023] Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

[0024] Optionally, the channel large-scale parameter type of the target signal includes at least one of the following:

[0025] Type 1, including Doppler shift, Doppler spread, average delay, and delay spread;

[0026] Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread;

[0027] Type three, including Doppler shift and Doppler spread;

[0028] Type 4, including relative Doppler shift and relative Doppler spread;

[0029] Type 5, including average delay and Doppler shift;

[0030] Type six, including average delay and relative Doppler shift;

[0031] Type seven, including spatial reception parameters.

[0032] Optionally, the type 2, the type 4 and the type 6 are applicable to a scenario where both the sender and the receiver are in fast movement; or

[0033] The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

[0034] Optionally, the target signal satisfies at least one of the following:

[0035] In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB;

[0036] In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS;

[0037] In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter;

[0038] In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS;

[0039] In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4;

[0040] In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

[0041] The embodiment of the present application also provides a terminal, including a memory, a transceiver, and a processor:

[0042] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0043] Acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-location QCL relationship of the target signal;

[0044] The target signal is transmitted according to the TCI state.

[0045] Optionally, the processor, for reading the computer program in the memory, further performs the following operations:

[0046] A TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

[0047] Optionally, the processor is configured to read the computer program in the memory and perform at least one of the following operations:

[0048] Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE;

[0049] The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

[0050] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0051] Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal;

[0052] receiving a TCI state corresponding to a target signal on a through link indicated by control information;

[0053] The TCI state corresponding to the target signal is one of the candidate TCI states.

[0054] Optionally, the processor, for reading the computer program in the memory, further performs the following operations:

[0055] Based on the target QCL relationship, receiving a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH;

[0056] The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

[0057] Optionally, the format of the TCI status includes at least one of the following formats:

[0058] Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal;

[0059] Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal;

[0060] Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

[0061] Optionally, the channel large-scale parameter type of the target signal includes at least one of the following:

[0062] Type 1, including Doppler shift, Doppler spread, average delay, and delay spread;

[0063] Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread;

[0064] Type three, including Doppler shift and Doppler spread;

[0065] Type 4, including relative Doppler shift and relative Doppler spread;

[0066] Type 5, including average delay and Doppler shift;

[0067] Type six, including average delay and relative Doppler shift;

[0068] Type seven, including spatial reception parameters.

[0069] Optionally, the type 2, the type 4 and the type 6 are applicable to a scenario where both the sender and the receiver are in fast movement; or

[0070] The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

[0071] Optionally, the target signal satisfies at least one of the following:

[0072] In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB;

[0073] In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS;

[0074] In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter;

[0075] In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS;

[0076] In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4;

[0077] In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

[0078] The embodiment of the present application further provides a signal transmission device, applied to a terminal, including:

[0079] An acquisition unit, used to acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi-co-site QCL relationship of the target signal;

[0080] A transmission unit is used to transmit the target signal according to the TCI state.

[0081] An embodiment of the present application further provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the above method.

[0082] The beneficial effects of this application are:

[0083] The above scheme obtains the transmission-related information of the target signal based on the TCI state corresponding to the target signal on the direct link, thereby reducing the signaling overhead of the direct link and reducing the decoding burden of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0085] Figure 1 A structural diagram showing a network system applicable to an embodiment of the present application;

[0086] Figure 2 A schematic diagram showing the NR TCI state structure;

[0087] Figure 3 A schematic diagram showing a flow chart of a signal transmission method according to an embodiment of the present application;

[0088] Figure 4 A schematic diagram showing the SL TCI state structure;

[0089] Figure 5 A schematic diagram showing a TCI configuration scenario applicable to signal source ID;

[0090] Figure 6One of the unit schematic diagrams showing the signal transmission device according to an embodiment of the present application;

[0091] Figure 7 A structural diagram of a terminal according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0092] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0093] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein, for example, are implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0094] In the embodiments of the present application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0095] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0096] The embodiments of the present application are described below in conjunction with the accompanying drawings. The signal transmission method, device, and terminal provided in the embodiments of the present application can be applied to a wireless communication system. The wireless communication system can be a system using the fifth generation (5th Generation, 5G) mobile communication technology (hereinafter referred to as a 5G system). Those skilled in the art can understand that the 5G NR system is only an example and is not a limitation.

[0097] See also Figure 1 , Figure 1 is a structural diagram of a network system to which the embodiments of the present application can be applied, such as Figure 1 As shown, it includes a user terminal 11 and a base station 12, wherein the user terminal 11 may be a user equipment (User Equipment, UE), for example: it may be a terminal side device such as a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant, referred to as PDA), a mobile Internet device (Mobile Internet Device, MID) or a wearable device (Wearable Device). It should be noted that the specific type of the user terminal 11 is not limited in the embodiment of the present application. The above-mentioned base station 12 may be a base station of 5G and later versions (for example: gNB, 5G NR NB), or a base station in other communication systems, or referred to as a node B. It should be noted that in the embodiment of the present application, only a 5G base station is taken as an example, but the specific type of the base station 12 is not limited.

[0098] The relevant concepts mentioned in this application are briefly described below.

[0099] 1. QCL design in existing NR

[0100] In NR, the antenna port is used to characterize the state of the wireless channel. The channel states experienced by signals on different ports are naturally different. However, even so, channels on different ports may still have certain common properties. These properties are called large-scale channel properties, which can also be called large-scale channel parameters, large-scale parameters or channel large-scale parameters. Based on this, the concept of QCL is introduced.

[0101] QCL means that the large-scale channel properties of the channel experienced by the symbols on a certain antenna port can be inferred from the channel experienced by the symbols on another antenna port. The large-scale channel properties include Doppler shift, Doppler spread, average delay, delay spread, and spatial RX parameter.

[0102] Among them, Spatial Rx Parameters is a new technical feature introduced by NR, corresponding to a series of spatial reception properties, mainly used in frequency bands above 6 GHz (FR2), because NR frequency bands above 6 GHz use digital-analog hybrid beamforming, the direction and width of the analog beam will affect the large-scale characteristics of the channel, so this parameter is introduced to characterize the impact of the beam on the channel characteristics. If the Spatial Rx Parameters of two reference signals are QCL (such as the periodic Channel State Information Reference Signal (CSI-RS) and the demodulation reference signal (De-Modulation Reference Signal, DMRS) of the physical downlink shared channel (PDSCH), then they come from the same beam (Beam), which means that the UE can receive with the same receive beam (Rx beam).

[0103] Long Term Evolution (LTE) has fewer reference signal types, no high-band digital-analog hybrid beamforming, and its synchronization signal (SS) is only used for synchronization, unlike the NR synchronization signal block (SSB) which can be used as a reference signal. Therefore, there are only two combinations of large-scale channel properties:

[0104] QCL Type A: The UE assumes that the antenna ports of the Cell Reference Signal (CRS), CSI-RS, and DMRS have the same delay spread, Doppler spread, Doppler shift, and average delay.

[0105] QCL Type B: The UE assumes that the CSI-RS and DMRS have the same delay spread, Doppler spread, Doppler shift, and average delay.

[0106] NR groups the large-scale channel attributes of the channel into the following four types based on different UE scenarios and the QCL relationship between various reference signals, and to reduce signaling overhead:

[0107] QCL Type A: Doppler shift, Doppler spread, Average delay, Delay spread;

[0108] QCL Type B: Doppler shift, Doppler spread;

[0109] QCL Type C: Average delay, Doppler shift;

[0110] QCL Type D: Spatial Rx Parameter (only for frequency bands above 6 GHz).

[0111] In order to configure the QCL relationship between reference signals, NR introduces TCI. The TCI state structure is as follows Figure 2 shown.

[0112] In the TCI state, if two QCL types are included, their corresponding QCL parameters cannot overlap, and the two reference signals of TCI can be the same.

[0113] For example, {CSI-RS0|QCL Type A, CSI-RS1|QCL Type D} indicates that the parameters (Doppler shift, Doppler spread, Average delay, Delay spread) of the target signal QCL Type A can refer to CSI-RS0, and the parameters (Spatial Rx Parameter) of the target signal QCL Type D can refer to CSI-RS1.

[0114] There are two main scenarios for introducing beam management into SL: one is transmission based on network scheduling, which is called mode 1; the other is that the terminal autonomously selects transmission resources, which is called mode 2. The terminal may include any R-18SL terminal including mobile vehicles.

[0115] There is no beam management related design in the existing SL technology. Directly introducing the NR beam management process into SL has the following disadvantages:

[0116] 1. In the sidelink, the terminal performance is often limited. After the introduction of beamforming, real-time reference signal decoding will cause a large load on the terminal. How to reduce the signaling overhead and the terminal decoding burden needs to be solved.

[0117] 2. The existing TCI configuration is not suitable for various SL scenarios, so it is necessary to design a new TCI configuration method to adapt to the development of SL technology.

[0118] Embodiments of the present application provide a signal transmission method, device, and terminal to reduce the signaling overhead and terminal decoding burden of a terminal in direct link communication.

[0119] Among them, the method and the device are based on the same application concept. Since the method and the device solve the problem in a similar principle, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0120] like Figure 3 As shown, an embodiment of the present application provides a signal transmission method, which is executed by a terminal, including:

[0121] Step S301, obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link;

[0122] Wherein, the TCI state is used to indicate a quasi co-location (QCL) relationship between the target signal and the source signal;

[0123] Optionally, the source signal may be understood as a QCL source signal.

[0124] It should be noted that since the number of bits occupied by TCI status transmission is relatively small, this indication method can reduce signaling overhead.

[0125] Step S302, transmitting the target signal according to the TCI state;

[0126] It should be noted that the terminal can determine which reference signal has QCL with the target signal through the TCI status, and can determine the transmission-related parameters of the target signal based on this reference signal. This method can reduce the signaling overhead of the direct link and reduce the terminal decoding burden.

[0127] It should be noted that the embodiment of the present application regroups the channel large-scale parameters for the direct link, and after grouping, the channel large-scale parameter types include the following:

[0128] A11, Type 1, including Doppler shift, Doppler spread, average delay, and delay spread;

[0129] It should be noted that this type 1 is applicable to the scenario where one of the sender and receiver is stationary.

[0130] Usually this type is identified as QCL Type A1.

[0131] A12, Type II, including relative Doppler shift, relative Doppler spread, average delay, and delay spread;

[0132] It should be noted that type 2 is applicable to scenarios where both the sender and the receiver are moving quickly.

[0133] Usually, the second type is identified as QCL Type A2.

[0134] A13, Type III, including Doppler shift and Doppler spread;

[0135] It should be noted that type three is applicable to the scenario where one of the sender and receiver is stationary.

[0136] Usually, the type three is identified as QCL Type B1.

[0137] A14, Type 4, including relative Doppler shift and relative Doppler spread;

[0138] It should be noted that type 4 is applicable to scenarios where both the sender and the receiver are moving quickly.

[0139] This type four is usually identified as QCL Type B2.

[0140] A15, Type 5, including average delay and Doppler shift;

[0141] It should be noted that type five is applicable to the scenario where one of the sender and receiver is stationary.

[0142] Usually, the type five is identified as QCL Type C1 (QCL Type C1).

[0143] A16, Type VI, including average delay and relative Doppler shift;

[0144] It should be noted that type six is ​​applicable to scenarios where both the sender and the receiver are moving quickly.

[0145] This type six is ​​usually identified as QCL Type C2.

[0146] A17, Type VII, including spatial reception parameters;

[0147] It should be noted that this type seven is only applicable to frequency bands above 6 GHz. It can be applied to scenarios where both the sender and the receiver are moving quickly, or it can be applied to scenarios where one of the sender and the receiver is stationary.

[0148] This type seven is usually identified as QCL Type D.

[0149] It should be noted here that the difference between relative Doppler shift and Doppler shift is that in the former both the sender and the receiver are in a mobile state, and the parameter calculation process must take into account the mobility of both the sender and the receiver; the difference between relative Doppler spread and Doppler spread is also that in the former both the sender and the receiver are in a mobile state, and the parameter calculation process must take into account the mobility of both the sender and the receiver.

[0150] Optionally, the channel large-scale parameter type of the target signal may include at least one of A11 to A17 above.

[0151] It should be further noted that, in order to configure the QCL relationship between signals, SLTCI is introduced in the embodiment of the present application. The SL TCI format involved in the embodiment of the present application includes at least one of the following formats:

[0152] A21, format 1, the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal;

[0153] That is to say, in this case, the target signal has only one QCL source signal. The specific format is: {QCL source signal|channel large-scale parameter type identifier}.

[0154] A22, format 2, the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and at least two QCL source signals belong to the same terminal;

[0155] That is to say, in this case, there are at least two QCL source signals for the target signal, at least two QCL source signals can be the same, but the specific channel large-scale parameters cannot overlap; for example, in the case where there are two QCL source signals, if the large-scale parameter type of the first channel is A11, the large-scale parameter type of the second channel can be A14 or A17, but cannot be A12, A13, A15 or A16.

[0156] The specific format is: {QCL source signal 1|channel large-scale parameter type identifier, QCL source signal 2|channel large-scale parameter type identifier}.

[0157] A23, format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals;

[0158] That is to say, in this case, there are at least two QCL source signals for the target signal, and at least two QCL source signals belong to different terminals. For example, there are three QCL source signals, namely, QCL source signal 1, QCL source signal 2 and QCL source signal 3. Then, QCL source signal 1 belongs to terminal 1, QCL source signal 2 belongs to terminal 2, and QCL source signal 3 belongs to terminal 3. That is to say, in this case, it is necessary to identify the terminal (or target source) based on each QCL source signal.

[0159] The specific format is: {target source ID|QCL source signal 1|channel large-scale parameter type identifier, target source ID|QCL source signal 2|channel large-scale parameter type identifier}.

[0160] Among them, format three adds a target source ID on the basis of format two, so that the channel large-scale parameter type (also called QCL type) of a signal can originate from different terminals.

[0161] For example, Figure 4 The following are application examples of the three formats. For the DMRS of PSFCH, if the TCI format is format one, it means that the parameters of QCL Type 1 of the DMRS of PSFCH can refer to RS1; if the TCI format is format two, it means that the parameters of QCL Type 1 of the DMRS of PSFCH can refer to RS1, and the parameters of QCL Type 2 of the DMRS of PSFCH can refer to RS2; if the TCI format is format three, it means that the parameters of QCL Type 1 of the DMRS of PSFCH can refer to RS1 from the target (Destination) ID1, and the parameters of QCL Type 2 of the DMRS of PSFCH can refer to RS2 from the Destination ID1.

[0162] For example, taking format three as an example, if the structure of the TCI format of a PSFCH is {UE1|PSSCH DMRS|QCLType A,UE2|S-SSB|QCL Type D}, it indicates that the parameters of the QCL Type A of the PSFCH can refer to the DMRS signal of the physical sidelink shared signal (PSSCH) of UE1, and the parameters of the QCLType D of the PSFCH can refer to the S-SSB signal of UE2.

[0163] Optionally, that is to say, the format of the TCI status of the embodiment of the present application includes at least one item from A21 to A23 mentioned above.

[0164] It should be noted that there are two scenarios for SL:

[0165] Mode 1: Network scheduling for transmission;

[0166] Mode 2: The terminal independently selects transmission resources.

[0167] For the mode 1 scenario, since the transmission source is gNB and there are no different signal sources, the format of the TCI state only includes at least one of the above A21 and A22. For example, after the UE accesses the base station, it receives and decodes the TCI state configuration {S-SSB|QCL Type C1}, which is used to indicate the QCL relationship when the target signal is CSI-RS; the parameters (average delay, Doppler shift) of the QCL Type C1 of the CSI-RS received by the UE can refer to the previously received S-SSB, thereby reducing signaling overhead and reducing decoding time.

[0168] For the mode 2 scenario, there may be different signal sources, so the format of the TCI status includes at least one of the above-mentioned A21 to A23.

[0169] For example, in one case, the two SL terminals UE1 and UE2 are outside the coverage of the base station and are communicating in mode 2 scenario. UE1 sends the TCI state configuration {S-SSB|QCL Type A2, CSI-RS|QCL Type D} to UE2 to indicate that the target signal is the QCL relationship of PSSCH DMRS; the parameters of QCL Type A2 (RelativeDoppler shift, Relative Doppler spread, Average delay, Delay spread) of the transmitted PSSCH DMRS can refer to S-SSB, and the parameters of QCL Type D (Spatial Rx Parameter) of PSSCH DMRS can refer to CSI-RS.

[0170] For example, in another case, Figure 5As shown, the three SL terminals UE1, UE2 and UE3 are outside the coverage of the base station and are communicating in mode 2 scenario, where UE2 acts as a relay for UE1 and UE3 to enhance the communication quality between UE1 and UE3. UE1 is approaching UE2 and will reach UE2 at the next moment. Therefore, there is a situation where part of the TCI state of UE3 refers to UE2, while the other part of the parameters refers to UE1. For example, UE2 sends a TCI state configuration {UE1 ID|S-SSB|QCLType A2, UE2 ID|CSI-RS|QCL Type D} to UE3, which is used to indicate that the target signal is the QCL relationship of PSSCH DMRS; the parameters (Relative Doppler shift, Relative Doppler spread, Average delay, Delay spread) of the QCL Type A2 of the transmitted PSSCH DMRS can refer to the S-SSB from UE1, and the parameters (Spatial Rx Parameter) of the QCL TypeD of the PSSCH DMRS can refer to the CSI-RS from UE2.

[0171] Optionally, in one implementation, for a periodic target signal, the TCI state of the target signal can be directly configured through radio resource control (RRC), that is, an implementation method of obtaining a transmission configuration indication TCI state corresponding to the target signal on the direct link includes:

[0172] The transmission configuration indication TCI state corresponding to the target signal on the direct link is obtained through RRC signaling.

[0173] Optionally, in another implementation manner, for a non-periodic or semi-persistent target signal, before acquiring a transmission configuration indication TCI state corresponding to the target signal, the method further includes:

[0174] A TCI state corresponding to at least one direct link signal configured by RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

[0175] That is to say, for a non-periodic signal, the terminal needs to obtain the TCI state corresponding to the direct link signal configured by the RRC signaling before obtaining the TCI state corresponding to the target signal. Further optionally, in one implementation, the specific implementation of obtaining the transmission configuration corresponding to the target signal on the direct link indicates the TCI state, including at least one of the following:

[0176] B11, obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element (MACCE);

[0177] It can be understood that for a semi-persistent signal, after the RRC configures the TCI state corresponding to at least one direct link signal, the MAC CE also needs to activate the TCI state corresponding to the target signal.

[0178] B12, receiving the transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the control information;

[0179] It should be noted that for aperiodic signals, after RRC configures the TCI state corresponding to at least one direct link signal, the control information also needs to indicate the TCI state corresponding to the target signal. Optionally, in one case, the control information indication can be used directly after the RRC signaling configuration.

[0180] Optionally, in another case, after the RRC signaling configuration, MAC CE activation may be used first, and then control information indication may be used. In this case, it can be understood that both B11 and B12 above need to be executed. Specifically, the specific implementation method in this case may be:

[0181] Acquire candidate TCI states activated by the MAC CE, where the candidate TCI states are at least two of the TCI states corresponding to the at least one direct link signal;

[0182] receiving a TCI state corresponding to a target signal on a through link indicated by control information;

[0183] It should be noted that the TCI state corresponding to the target signal is one of the candidate TCI states.

[0184] It should be noted here that in the case of mode 1 scenario, the control information refers to the downlink control information (Downlink Control Information, DCI) sent by the network device; in the case of mode 2 scenario, the control information refers to the direct link control information (Sidelink Control Information, SCI) sent by the terminal.

[0185] For example, for the mode 1 scenario, there are the following TCI status configuration methods:

[0186] C11, configured through RRC signaling;

[0187] This method is usually suitable for target signals that are periodic.

[0188] C12, configured through RRC signaling and activated by MAC-CE;

[0189] It should be noted that this situation is usually applicable when the target signal is a semi-continuous signal.

[0190] C13, configured through RRC signaling and indicated using DCI;

[0191] It should be noted that this situation is usually applicable when the target signal is a non-periodic signal.

[0192] C14, configured through RRC signaling, activated by MAC CE, and indicated by DCI;

[0193] It should be noted that this situation is usually applicable when the target signal is a non-periodic signal.

[0194] Taking SL CSI-RS as an example, since SL CSI-RS is a non-periodic signal, its configuration method is: configured through RRC signaling, activated by MAC-CE, and indicated by DCI.

[0195] For example, in the actual implementation process, it can be divided into the following steps:

[0196] Step 11: RRC signaling configures M TCI states, where the maximum value of M depends on the terminal capability;

[0197] Step 12: Select up to 8 TCI states (corresponding to the 3-bit TCI information field in the DCI) through MAC CE. If M is less than or equal to 8, the TCI state configured by RRC signaling can directly correspond to the TCI information field in the DCI without MAC CE indication;

[0198] Step 13: The TCI information field in DCI format 1_1 indicates one of the maximum eight TCI states selected by MAC CE, and the terminal uses the TCI state to obtain the corresponding QCL type of the target QCL source signal.

[0199] In subsequent standard work, periodic CSI-RS or semi-periodic CSI-RS may be configured. In this case, it is only necessary to use RRC signaling configuration or use RRC signaling configuration and then activate it by MAC CE, and execute the first step or the first two steps accordingly.

[0200] For example, for the mode 2 scenario, there are the following TCI status configuration methods:

[0201] C21, configured through RRC signaling;

[0202] This method is usually suitable for target signals that are periodic.

[0203] C22, configured through RRC signaling and activated by MAC-CE;

[0204] It should be noted that this situation is usually applicable when the target signal is a semi-continuous signal.

[0205] C23, configured through RRC signaling and indicated using SCI;

[0206] It should be noted that this situation is usually applicable when the target signal is a non-periodic signal.

[0207] C24, configured through RRC signaling, activated by MAC-CE, and indicated by SCI;

[0208] It should be noted that this situation is usually applicable when the target signal is a non-periodic signal.

[0209] Taking SL CSI-RS as an example, since SL CSI-RS is a non-periodic signal, its configuration method is: configured through RRC signaling, activated by MAC CE, and indicated by SCI.

[0210] For example, in the actual implementation process, it can be divided into the following steps:

[0211] Step 21: RRC signaling configures M TCI states, where the maximum value of M depends on the terminal capability;

[0212] Step 22: Select up to 2 through MAC-CE k TCI states (corresponding to the k bit TCI information field in the SCI, where the value of k is determined by the number of SCI redundant bits used), if M is less than or equal to 2 k , then the RRC signaling configuration TCI state can directly correspond to the TCI information field in the SCI without the need for MAC-CE indication;

[0213] Step 23: The TCI information field in the SCI selects up to 2 k The UE indicates one of the TCI states, and the UE uses the TCI state to obtain the corresponding QCL type of the target QCL source signal.

[0214] Similarly, when the configured signal is a periodic signal or a semi-continuous signal, it only needs to be configured using RRC signaling or activated by MAC CE after configuration using RRC signaling (it is also possible to directly perform SCI indication without MAC CE activation), and the first step or the first two steps can be executed accordingly.

[0215] Optionally, in one implementation, before receiving the TCI state corresponding to at least one direct link signal configured by RRC signaling, the method further includes:

[0216] Based on the target QCL relationship, receiving a physical downlink shared channel (PDSCH) and / or a physical downlink control channel (PDCCH);

[0217] The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

[0218] It should be noted here that this situation refers to the situation before RRC configuration. In order to smoothly carry out SL data transmission, data needs to be sent and received based on the configured default QCL relationship.

[0219] For example, the QCL relationship before RRC configuration is shown in Table 1:

[0220] Table 1 QCL relationship before RRC configuration

[0221]

[0222] That is to say, before the RRC signaling configuration, a terminal has the system default SSB to DMRS QCL relationship, and can obtain one or more of the channel's Doppler shift, Doppler spread, relative Doppler shift, relative Doppler spread, average delay and delay spread parameters from the SSB to receive PDSCH and PDCCH. For frequency bands above 6 GHz, spatial reception parameters are also obtained from the SSB.

[0223] Optionally, in one implementation, the target signal satisfies at least one of the following:

[0224] D11. When the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block (S-SSB);

[0225] It should be noted that for frequency bands below 6 GHz, the average delay, Doppler shift and / or relative Doppler shift of the CSI-RS are determined based on S-SSB. This situation is mainly applicable to scenarios where the channel large-scale parameter types are QCL Type C1 and QCL Type C2.

[0226] For frequency bands above 6 GHz, the spatial reception parameters of the CSI-RS are determined based on S-SSB. This situation is mainly applicable to the scenario where the channel large-scale parameter type is QCL Type D.

[0227] D12. When the target signal is a demodulation reference signal (DMRS), the Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay, delay spread reference and / or spatial reception parameters of the DMRS are determined based on the CSI-RS;

[0228] Optionally, the DMRS may be a DMRS of a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH).

[0229] For frequency bands below 6 GHz, the Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay and / or delay spread reference of the DMRS is determined based on CSI-RS. This situation is mainly applicable to scenarios where the channel large-scale parameter types are QCL Type A1 and QCL Type A2.

[0230] For frequency bands above 6 GHz, the spatial reception parameters of the DMRS of the PSCCH are determined based on the CSI-RS, and the spatial reception parameters of the DMRS of the PSSCH are determined based on the CSI-RS. This situation is mainly applicable to the scenario where the channel large-scale parameter type is QCL Type D. The Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay, delay spread reference and / or spatial reception parameters of the DMRS of the PSSCH are determined based on the CSI-RS. This situation is mainly applicable to the scenario where the channel large-scale parameter type is QCL Type A1, QCL Type A2 and QCL Type D.

[0231] D13. When the target signal is a demodulation reference signal DMRS, the large-scale channel parameters of the DMRS are determined based on S-SSB, and the large-scale channel parameters include at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameters;

[0232] It should be noted that this situation is mainly applicable to frequency bands above 6 GHz. The Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay, delay spread reference and / or spatial reception parameters of the DMRS of the PSCCH are determined based on S-SSB; The Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay, delay spread reference and / or spatial reception parameters of the DMRS of the PSCCH are determined based on S-SSB. This situation is mainly applicable to scenarios where the channel large-scale parameter types are QCL Type A1, QCL Type A2 and QCL Type D.

[0233] D14, when the target signal is a physical direct link feedback channel PSFCH, the Doppler shift, relative Doppler shift, Doppler spread, relative Doppler spread, average delay, delay spread reference and / or spatial reception parameters of the PSFCH are determined based on the CSI-RS;

[0234] It should be noted that this situation is mainly applicable to frequency bands below 6 GHz. This situation is mainly applicable to scenarios where the channel large-scale parameter types are QCL Type A1, QCL Type A2, and QCL Type D.

[0235] D15, when the target signal is PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameters of the PSFCH are determined based on the CSI-RS or DMRS received N cycles before the PSFCH, where N is the PSFCH feedback cycle, N=1, 2 or 4;

[0236] It should be noted that the specific value of N depends on the period setting of PSFCH in SL.

[0237] It should be noted that this situation is mainly applicable to frequency bands above 6 GHz. This situation is mainly applicable to scenarios where the channel large-scale parameter types are QCL Type A1, QCL Type A2, and QCL Type D.

[0238] D16. When the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

[0239] It should be noted that this situation is applicable to frequency bands above 6 GHz and also to frequency bands below 6 GHz, that is, the spatial reception parameters of the CSI-RS with a later transmission time domain can be determined based on the CSI-RS with an earlier transmission time domain.

[0240] For example, the QCL relationship after RRC configuration (frequency band below 6 GHz) is shown in Table 2:

[0241] Table 2 QCL relationship before RRC configuration (applicable to frequency bands below 6 GHz)

[0242]

[0243] It should be noted that QCL Type C1 / QCL Type C2 are rough large-scale channel parameters such as (relative) Doppler shift and average delay. The above information of S-SSB can be used to assist the reception of CSI-RS; one or more of the (relative) Doppler shift, (relative) Doppler spread, average delay, and delay spread information of CSI-RS can be used to assist the reception of DMRS or PSFCH. For frequency bands below 6GHz, the spatial reception parameters of PSFCH can also be obtained from CSI-RS.

[0244] For example, the QCL relationship after RRC configuration (frequency band above 6 GHz) is shown in Table 3:

[0245] Table 3 QCL relationship before RRC configuration (applicable to frequency bands above 6 GHz)

[0246]

[0247] It should be noted that S-SSB can provide spatial reception reference for CSI-RS and DMRS, and provide large-scale channel parameter reference in the time and frequency domain for DMRS. CSI-RS can provide large-scale channel parameter reference for DMRS, and at the same time, the earlier CSI-RS in the time domain can provide spatial reception parameter reference for the later CSI-RS.

[0248] It should be noted that in the SL-specific PSFCH channel, all large-scale channel parameters can refer to the CSI-RS or DMRS decoded N cycles ago of the PSFCH, but the PSFCH channel parameters cannot refer to the S-SSB. For example, assuming that the three SL terminals UE1, UE2 and UE3 are outside the coverage of the base station and communicate in mode 2 scenario, there is a situation: UE1 and UE2 sent information to UE3 several cycles ago (PSFCH feedback is generally performed 1, 2 or 4 cycles after the signal is sent. The description here refers to N (N = 1, 2 or 4) cycles ago, UE1 and UE2 sent information to UE3 at the same time, and UE3's feedback to the two transmitters needs to be performed at the same time. At this moment, some parameters of UE3's PSFCH channel come from UE1's reference signal, and the other parameters come from UE2's reference signal). UE3 feeds back to UE1 and UE2 through PSFCH at the current moment. Some parameters of UE3's PSFCH channel come from UE1's reference signal, and the other parameters come from UE2's reference signal.

[0249] For example, UE2 sends the TCI state {UE1 ID|CSI-RS|QCL Type A2, UE2ID|DMRS|QCLType D} to UE3 to indicate the transmission information of PSFCH of UE3. After UE3 receives the TCI state, the parameters of QCL Type A2 of PSFCH (Relative Doppler shift, Relative Doppler spread, Average delay, Delay spread) can refer to the CSI-RS from UE1, and the parameters of QCL Type D of PSFCH (Spatial Rx Parameter) can refer to the DMRS from UE2.

[0250] It should be noted that the embodiments of the present application can achieve the following beneficial effects:

[0251] 1. Solve the incompatibility problem of directly introducing the NR TCI configuration solution into Sidelink, and provide a feasible QCL solution for SL;

[0252] 2. Using TCI configuration requires lower computing power and less processing time, so it has lower requirements on SL UE capabilities, lower power consumption, and longer UE standby time.

[0253] The technical solution provided in the embodiment of the present application can be applicable to a variety of systems, especially 5G systems. For example, the applicable system can be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a universal mobile telecommunication system (UMTS), a world-wide interoperability for microwave access (WiMAX) system, a 5G new radio (NR) system, etc. These various systems include terminals (also referred to as terminal equipment) and network equipment. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), etc.

[0254] The terminal involved in the embodiment of the present application may also be referred to as a terminal device, which may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device may be referred to as a user equipment (UE). A wireless terminal device may communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and / or data with a wireless access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited in the embodiments of the present application.

[0255] The network device involved in the embodiment of the present application may be a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, and serve as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a home evolved Node B (Home evolved Node B, HeNB), a relay terminal node (relay node), a home base station (femto), a pico base station (pico), etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0256] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

[0257] like Figure 6 As shown, the embodiment of the present application provides a signal transmission device 600, which is applied to a terminal, including:

[0258] An acquisition unit 601 is used to acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-site QCL relationship of the target signal;

[0259] The transmission unit 602 is configured to transmit the target signal according to the TCI state.

[0260] Optionally, in one implementation, before the acquiring unit 601 acquires the transmission configuration indication TCI state corresponding to the target signal, the method further includes:

[0261] The first receiving unit is used to receive a TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling, wherein the target signal belongs to one of the at least one direct link signal.

[0262] Optionally, in one implementation, the acquiring unit 601 is configured to implement at least one of the following:

[0263] Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE;

[0264] The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

[0265] Optionally, in one implementation, the acquisition unit 601 receives the implementation of the transmission configuration indication TCI state corresponding to the target signal on the direct link indicated by the control information, including:

[0266] Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal;

[0267] receiving a TCI state corresponding to a target signal on a through link indicated by control information;

[0268] The TCI state corresponding to the target signal is one of the candidate TCI states.

[0269] Optionally, in one implementation, before the first receiving unit receives a TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling, the device further includes:

[0270] A second receiving unit, configured to receive a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH based on a target QCL relationship;

[0271] The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

[0272] Optionally, in one implementation, the format of the TCI status includes at least one of the following formats:

[0273] Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal;

[0274] Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal;

[0275] Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

[0276] Optionally, in an implementation manner, the channel large-scale parameter type of the target signal includes at least one of the following:

[0277] Type 1, including Doppler shift, Doppler spread, average delay, and delay spread;

[0278] Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread;

[0279] Type three, including Doppler shift and Doppler spread;

[0280] Type 4, including relative Doppler shift and relative Doppler spread;

[0281] Type 5, including average delay and Doppler shift;

[0282] Type six, including average delay and relative Doppler shift;

[0283] Type seven, including spatial reception parameters.

[0284] Optionally, in one implementation, the type 2, the type 4 and the type 6 are applicable to a scenario where both the sender and the receiver are in fast motion; or

[0285] The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

[0286] Optionally, in one implementation, the target signal satisfies at least one of the following:

[0287] In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB;

[0288] In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS;

[0289] In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter;

[0290] In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS;

[0291] In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4;

[0292] In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

[0293] It should be noted that the device embodiment is a device that corresponds one-to-one to the above-mentioned method embodiment. All implementation methods in the above-mentioned method embodiment are applicable to the device embodiment and can achieve the same technical effect.

[0294] It should be noted that the division of units in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0295] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0296] like Figure 7 As shown, the embodiment of the present application further provides a terminal, including a processor 700, a transceiver 710, a memory 720, and a program stored in the memory 720 and executable on the processor 700; wherein the transceiver 710 is connected to the processor 700 and the memory 720 through a bus interface, wherein the processor 700 is used to read the program in the memory and execute the following process:

[0297] Acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-location QCL relationship of the target signal;

[0298] The target signal is transmitted according to the TCI state.

[0299] The transceiver 710 is configured to receive and send data under the control of the processor 700 .

[0300] Among them, Figure 7In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 700 and various circuits of memory represented by memory 720 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 710 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, including wireless channels, wired channels, optical cables, and other transmission media. For different user devices, the user interface 730 may also be an interface capable of externally and internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0301] The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 can store data used by the processor 700 when performing operations.

[0302] Optionally, the processor 700 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

[0303] The processor calls the computer program stored in the memory to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions. The processor and the memory can also be arranged physically separately.

[0304] Optionally, the processor, for reading the computer program in the memory, further performs the following operations:

[0305] A TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

[0306] Optionally, the processor is configured to read the computer program in the memory and perform at least one of the following operations:

[0307] Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE;

[0308] The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

[0309] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0310] Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal;

[0311] receiving a TCI state corresponding to a target signal on a through link indicated by control information;

[0312] The TCI state corresponding to the target signal is one of the candidate TCI states.

[0313] Optionally, the processor, for reading the computer program in the memory, further performs the following operations:

[0314] Based on the target QCL relationship, receiving a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH;

[0315] The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

[0316] Optionally, the format of the TCI status includes at least one of the following formats:

[0317] Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal;

[0318] Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal;

[0319] Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

[0320] Optionally, the channel large-scale parameter type of the target signal includes at least one of the following:

[0321] Type 1, including Doppler shift, Doppler spread, average delay, and delay spread;

[0322] Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread;

[0323] Type three, including Doppler shift and Doppler spread;

[0324] Type 4, including relative Doppler shift and relative Doppler spread;

[0325] Type 5, including average delay and Doppler shift;

[0326] Type six, including average delay and relative Doppler shift;

[0327] Type seven, including spatial reception parameters.

[0328] Optionally, the type 2, the type 4 and the type 6 are applicable to a scenario where both the sender and the receiver are in fast movement; or

[0329] The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

[0330] Optionally, the target signal satisfies at least one of the following:

[0331] In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB;

[0332] In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS;

[0333] In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter;

[0334] In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS;

[0335] In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4;

[0336] In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

[0337] It should be noted here that the above-mentioned terminal provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0338] The embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of a signal transmission method applied to a terminal. The processor-readable storage medium may be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.

[0339] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0340] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer executable instructions. These computer executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0341] These processor executable instructions may also be stored in a processor readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0342] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0343] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A signal transmission method, characterized in that: Executed by the terminal, including: Acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-location QCL relationship of the target signal; The target signal is transmitted according to the TCI state.

2. The method according to claim 1, characterized in that Before acquiring the transmission configuration indication TCI state corresponding to the target signal, the method further includes: A TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

3. The method according to claim 2, characterized in that The acquiring of the transmission configuration indication TCI state corresponding to the target signal on the through link includes at least one of the following: Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE; The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

4. The method according to claim 3, characterized in that The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information includes: Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal; receiving a TCI state corresponding to a target signal on a through link indicated by control information; The TCI state corresponding to the target signal is one of the candidate TCI states.

5. The method according to claim 2, characterized in that: Before the TCI state corresponding to at least one direct link signal configured by the receiving radio resource control RRC signaling, the method further includes: Based on the target QCL relationship, receiving a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH; The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

6. The method according to any one of claims 1 to 5, characterized in that: The format of the TCI status includes at least one of the following formats: Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal; Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal; Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

7. The method according to any one of claims 1 to 5, characterized in that: The channel large-scale parameter type of the target signal includes at least one of the following: Type 1, including Doppler shift, Doppler spread, average delay, and delay spread; Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread; Type three, including Doppler shift and Doppler spread; Type 4, including relative Doppler shift and relative Doppler spread; Type 5, including average delay and Doppler shift; Type six, including average delay and relative Doppler shift; Type seven, including spatial reception parameters.

8. The method according to claim 7, characterized in that Type 2, Type 4 and Type 6 are applicable to scenarios where both the sender and the receiver are moving fast; or The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

9. The method according to claim 1 or 2, characterized in that: The target signal satisfies at least one of the following: In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB; In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS; In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter; In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS; In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4; In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

10. A terminal, characterized in that: Including memory, transceiver, processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Acquire a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used to indicate a quasi co-location QCL relationship of the target signal; The target signal is transmitted according to the TCI state.

11. The terminal according to claim 10, characterized in that: The processor is configured to read the computer program in the memory and further perform the following operations: A TCI state corresponding to at least one direct link signal configured by radio resource control RRC signaling is received, wherein the target signal belongs to one of the at least one direct link signal.

12. The terminal according to claim 11, characterized in that: The processor is configured to read the computer program in the memory and perform at least one of the following operations: Obtaining a transmission configuration indication TCI state corresponding to a target signal on a through link activated by a media access control control element MAC CE; The transmission configuration indication TCI state corresponding to the target signal on the through link indicated by the receiving control information.

13. The terminal according to claim 12, characterized in that: The processor is configured to read the computer program in the memory and perform the following operations: Acquire a candidate TCI state activated by a media access control control element MAC CE, where the candidate TCI state is at least two of the TCI states corresponding to the at least one direct link signal; receiving a TCI state corresponding to a target signal on a through link indicated by control information; The TCI state corresponding to the target signal is one of the candidate TCI states.

14. The terminal according to claim 11, characterized in that: The processor is configured to read the computer program in the memory and further perform the following operations: Based on the target QCL relationship, receiving a physical downlink shared channel PDSCH and / or a physical downlink control channel PDCCH; The target QCL relationship is used to indicate that there is a QCL between the PDSCH and / or PDCCH and the direct link synchronization signal block S-SSB.

15. The terminal according to any one of claims 10 to 14, characterized in that: The format of the TCI status includes at least one of the following formats: Format 1, wherein the format 1 is used to indicate that the channel large-scale parameter type of the target signal corresponds to a QCL source signal; Format 2, where the format 2 is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to the same terminal; Format three, the format three is used to indicate that at least two channel large-scale parameter types of the target signal correspond to at least two QCL source signals, and the at least two QCL source signals belong to different terminals.

16. The terminal according to any one of claims 10 to 14, characterized in that: The channel large-scale parameter type of the target signal includes at least one of the following: Type 1, including Doppler shift, Doppler spread, average delay, and delay spread; Type 2, including relative Doppler shift, relative Doppler spread, average delay, and delay spread; Type three, including Doppler shift and Doppler spread; Type 4, including relative Doppler shift and relative Doppler spread; Type 5, including average delay and Doppler shift; Type six, including average delay and relative Doppler shift; Type seven, including spatial reception parameters.

17. The terminal according to claim 16, characterized in that: Type 2, Type 4 and Type 6 are applicable to scenarios where both the sender and the receiver are moving fast; or The type 1, the type 3 and the type 5 are applicable to the scenario where one of the sender and the receiver is stationary.

18. The terminal according to claim 10 or 11, characterized in that: The target signal satisfies at least one of the following: In the case where the target signal is a channel state information reference signal CSI-RS, the average delay, Doppler shift, relative Doppler shift and / or spatial reception parameter of the CSI-RS are determined based on a direct link synchronization signal block S-SSB; In the case where the target signal is a demodulation reference signal DMRS, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the DMRS is determined based on the CSI-RS; In the case where the target signal is a demodulation reference signal DMRS, a large-scale channel parameter of the DMRS is determined based on S-SSB, and the large-scale channel parameter includes at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, relative Doppler shift, relative Doppler spread, and spatial reception parameter; In a case where the target signal is a physical direct link feedback channel PSFCH, a Doppler shift, a relative Doppler shift, a Doppler spread, a relative Doppler spread, an average delay, a delay spread reference and / or a spatial reception parameter of the PSFCH is determined based on the CSI-RS; In the case where the target signal is a PSFCH, the Doppler shift, Doppler spread, relative Doppler offset, relative Doppler spread, average delay, delay spread and / or spatial reception parameter of the PSFCH are determined based on a CSI-RS or DMRS received N cycles before the PSFCH, where N is a PSFCH feedback cycle, and N=1, 2 or 4; In the case that the target signal is a first CSI-RS, a spatial reception parameter of the first CSI-RS is determined based on a second CSI-RS, and a transmission time domain of the second CSI-RS is earlier than that of the first CSI-RS.

19. A signal transmission device, applied to a terminal, characterized in that: include: An acquisition unit, used for acquiring a transmission configuration indication TCI state corresponding to a target signal on a through link, wherein the TCI state is used for indicating a quasi-co-site QCL relationship of the target signal; A transmission unit is used to transmit the target signal according to the TCI state.

20. A processor-readable storage medium, characterized in that: The processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the method according to any one of claims 1 to 9.

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