Method for transmitting information on sidelink and communication apparatus

Abstract

A method for transmitting information on a sidelink and a communication apparatus. A comparison result between a measurement result of a plurality of reference signals (i.e., a plurality of beams) and a threshold is fed back within the same time unit, or whether a measurement result of a plurality of reference signals satisfies a condition is fed back, instead of directly feeding back the measurement result of the plurality of reference signals. Different reference signals correspond to different beam directions (different reference signals are sent by using different beams). A measurement result of a reference signal (beam) comprises at least one of RSRP, RSRQ, SNR, BLER, or SINR. The comparison result between the measurement result and the threshold may comprise, for example, a difference, a difference range, or a difference interval. The information length used for indicating whether the comparison result or the measurement result satisfies the condition is less than the information length used for directly indicating the measurement result, so that the amount of data that must be fed back may be effectively reduced, decreasing the length of feedback information and communication resources required by the feedback information.

Description

Method and communication device for information transmission on side link

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 25, 2023, with application number 202311398111.8 and application name “Method and communication device for information transmission on side link”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more specifically, to a method and a communication device for transmitting information on a side link. Background Art

[0003] In the new radio (NR) communication system, beam (or beam pair) maintenance is performed between the base station and the terminal device through the channel state information reference signal (CSI-RS), and the measurement results of the measured CSI-RS are reported through the media access control element (MAC CE). One reference signal corresponds to one beam, or one reference signal is sent using one beam. One reference signal corresponds to one CSI-RS measurement report (CSI-reporting), or one beam corresponds to one CSI-RS measurement report. On the sidelink, beam (or beam pair) maintenance is also required between terminal devices and terminal devices. During the beam maintenance process between the receiving device and the transmitting device, the receiving device needs to report the measurement results of the reference signal. Currently, when the receiving device reports the measurement results of the reference signal, the amount of data that needs to be fed back is relatively large, the resources occupied are relatively large, and the communication resources are seriously consumed.

[0004] Summary of the Invention

[0005] The present application provides a method and communication device for information transmission on a sidelink, which aggregates and transmits feedback information (i.e., measurement results) corresponding to multiple beams (i.e., multiple beam pairs). Furthermore, the feedback information for each beam does not directly indicate the measurement result of the beam, but rather indicates the comparison result of the beam's measurement result with a threshold, or indicates whether the beam's measurement result meets a condition. This can effectively reduce the amount of data required for feedback, the length of the feedback information, and the communication resources required for the feedback information. In this way, the amount of data required for feedback can be effectively reduced, thereby reducing the consumption of communication resources.

[0006] In a first aspect, a method for information transmission on a side link is provided. The execution subject of the method can be a first terminal device, or a chip, a chip system, or a processor that supports the first terminal device to implement the method. The method includes: the first terminal device sends K reference signals to the second terminal device on K time-frequency resources respectively, different time-frequency resources in the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1; the first terminal device receives feedback information from the second terminal device on the first time-frequency resource, and the feedback information includes: first indication information for indicating whether the measurement results of the K reference signals meet the conditions, or second indication information for indicating the comparison results of the measurement results of the K reference signals with the threshold. At least one; or, the feedback information includes: indication information for indicating the measurement results corresponding to the K reference signals, and different time-frequency resources in the K time-frequency resources correspond to different beam directions. Each time-frequency resource is used to send a reference signal. The reference signal identifiers corresponding to the K reference signals are different, and different beams can be indicated by different reference signal identifiers.

[0007] The method for information transmission on the side link provided by the first aspect is to receive feedback from the second terminal device within the same time unit (on the first time-frequency resource) on the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with the threshold, or whether the measurement results of multiple reference signals meet the conditions, rather than directly feeding back the measurement results of multiple reference signals. Different reference signals correspond to different beam directions. The length of the information used to indicate whether the comparison result or the measurement result meets the conditions is less than the length of the information used to indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back, reduce the length of the feedback information and the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

[0008] Exemplarily, the K reference signals correspond to different reference signal identifiers, and different beams can be indicated by different reference signal identifiers.

[0009] Exemplarily, the comparison result between the measurement result of the reference signal and the threshold may include a difference value (a value obtained by subtracting the threshold value from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold value).

[0010] Exemplarily, the first time-frequency resource may occupy at least one symbol, at least one time slot, or at least one subframe in the time domain.

[0011] Exemplarily, each of the K time-frequency resources may occupy at least one symbol, at least one time slot, or at least one subframe in the time domain.

[0012] Exemplarily, the reference signal includes at least one of CSI-RS, SSB, S-SSS, S-PSS or DMRS.

[0013] Exemplarily, the measurement result of the reference signal includes: at least one of RSRP of the reference signal, RSRQ of the reference signal, SNR of the reference signal, or SINR of the reference signal.

[0014] In a possible implementation of the first aspect, K reference signals may be sent multiple times continuously. The multiple transmission of K reference signals may be understood as: the first terminal device sending K reference signals is regarded as one time or a group of transmissions, and the first terminal device may send multiple times or multiple groups continuously.

[0015] In a possible implementation of the first aspect, satisfying the condition includes: each measurement result of K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of the K reference signals in N consecutive measurements is greater than or equal to the first threshold, where N is an integer greater than or equal to 1, and each measurement result includes measurement results of the K reference signals. Exemplarily, the feedback information includes only one first indication information, and the length of the first indication information in the feedback information may be 1 bit, which is used to indicate that each measurement result in N consecutive measurements is greater than or equal to the first threshold (i.e., used to indicate that the condition is satisfied). Alternatively, it is used to indicate that each measurement result in N consecutive measurements is less than or equal to the first threshold (i.e., used to indicate that the condition is not satisfied). Each measurement result includes measurement results of the K reference signals. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0016] In a possible implementation of the first aspect, a measurement result of the i-th reference signal among K reference signals satisfies a condition including: measurement results of the i-th reference signal in m consecutive measurements are all greater than or equal to a threshold, and first indication information corresponding to the i-th reference signal may be used to indicate: measurement results of the i-th reference signal in m consecutive measurements are all greater than or equal to the threshold (i.e., the first indication information is used to indicate that the condition is satisfied). The number of first indication information included in the feedback information may be less than or equal to K. Each piece of first indication information needs to carry a reference signal identifier or beam identifier corresponding to the indication information.

[0017] In a possible implementation of the first aspect, the condition that the measurement result of the i-th reference signal among K reference signals meets includes: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the i-th reference signal is used to indicate: the measurement result of the i-th reference signal meets the condition or the measurement result of the i-th reference signal does not meet the condition. The length of each first indication information can be 1 bit or can be greater than 1 bit, for example, 2 bits or 3 bits. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0018] In a possible implementation of the first aspect, a condition that a measurement result of the i-th reference signal among K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The first indication information corresponding to the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The length of one first indication information can be 1 bit, or can be greater than 1 bit, for example, 2 bits or 3 bits. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0019] In one possible implementation of the first aspect, the second indication information is used to indicate that measurement feedback information for the i-th reference signal among K reference signals includes K pieces of second indication information. One piece of second indication information is used to indicate a comparison result of a measurement result of one reference signal with a fifth threshold, where i is 1, 2, ..., K, and the feedback information includes K pieces of second indication information. The length of one piece of first indication information can be 1 bit, or can be greater than 1 bit, for example, 2 bits or 3 bits. This can further reduce the amount of data required for feedback, as the feedback information or first indication information only requires 1 bit, further reducing communication resource consumption.

[0020] For example, the length of a second indication information may be 4 bits, and the 4-bit indication information may be used to quantify the difference between a reference signal and the fifth threshold.

[0021] Exemplarily, at least one of the threshold range, the first threshold, the second threshold, the third threshold, the fourth threshold or the fifth threshold may be predefined, or may be indicated by the first terminal device to the second terminal device through signaling, or the first threshold may be preconfigured (or configured).

[0022] Exemplarily, the situations in which the measurement result of a certain reference signal meets the conditions and the situations in which the conditions are not met can be predefined, preconfigured, or indicated or configured by the network device to the first terminal device and the second terminal device through DCI, RRC signaling, SIB information or MIB information, or indicated or configured by the first terminal device to the second terminal device through SCI or PC5 RRC signaling, or indicated or configured by the second terminal device to the first terminal device through SCI or PC5 RRC signaling. In other words, the first terminal device and the second terminal device have the same understanding of whether the measurement result of a certain reference signal meets the conditions.

[0023] In a possible implementation of the first aspect, the time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located, and the first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K. In this implementation, the first terminal device can accurately determine the time domain position of the first time-frequency resource, thereby improving the accuracy and efficiency of receiving feedback information. The first terminal device and the second terminal device have a consistent understanding of the time domain position of the first time-frequency resource and which reference information is fed back on the first time-frequency resource, thereby ensuring the success rate and effectiveness of sending the feedback information.

[0024] In a possible implementation manner of the first aspect, the first time-frequency resource corresponds to a second beam, and the second beam is predefined or preconfigured.

[0025] Exemplarily, the second beam may be a receiving beam of the first terminal device.

[0026] In a possible implementation of the first aspect, the first terminal device sends K reference signals to the second terminal device on K time-frequency resources, respectively, including:

[0027] The first terminal device sends K reference signals and third indication information to the second terminal device on K time-frequency resources respectively, and the third indication information is used to indicate; the cumulative number of reference signals sent by the first terminal device, or the third indication information is used to indicate the sequence number, index or arrangement of the reference signals sent by the first terminal device, or the third indication information is used to indicate which reference signal the current reference signal is in the order of the K reference signals from early to late in the time domain, or the third indication information is used to indicate: the total number of reference signals sent by the first terminal device as of the current reference signal. When the first terminal device sends K reference signals to the second terminal device on K time-frequency resources, a reference signal and a third indication information are sent on each time-frequency resource, then K third indication information needs to be sent, and each third indication information corresponds to a reference signal or a beam. In this implementation, the third indication information is used to indicate which number of beam maintenance the first terminal device and the second terminal device are currently performing, and the third indication information is similar to the function of C-DAI. Through the third indication information, the second terminal device can effectively determine whether a reference signal (or beam) may be missed or there is a problem with the beam, and can quickly adjust the subsequent beam reception. It can also improve the accuracy and efficiency of receiving the reference signal, and can accurately determine the measurement results corresponding to each reference signal, thereby ensuring the accuracy of the feedback information.

[0028] In a second aspect, a method for information transmission on a sidelink is provided. The execution subject of the method can be a second terminal device, or a chip, chip system, or processor that supports the second terminal device to implement the method. The method includes: the second terminal device receives K reference signals from the first terminal device on K time-frequency resources, respectively, where different time-frequency resources in the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1; the second terminal device sends feedback information to the first terminal device on the first time-frequency resource, and the feedback information includes: first indication information for indicating whether the measurement results of the K reference signals measured by the second terminal device on the K time-frequency resources meet the conditions, or second indication information for indicating the comparison results of the measurement results of the K reference signals with a threshold. Alternatively, the feedback information includes indication information for indicating the measurement results corresponding to the K reference signals, where different time-frequency resources in the K time-frequency resources correspond to different beam directions. Each time-frequency resource is used to send a reference signal.

[0029] The second aspect provides a method for transmitting information on the side link, which feeds back to the first terminal device within the same time unit (on the first time-frequency resource) the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with the threshold, or whether the measurement results of multiple reference signals meet the conditions, rather than directly feeding back the measurement results of multiple reference signals. Different reference signals correspond to different beam directions. The length of the information used to indicate whether the comparison result or the measurement result meets the conditions is less than the length of the information used to indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back, reduce the length of the feedback information and the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

[0030] In a possible implementation of the second aspect, K reference signals may be sent multiple times continuously. The multiple transmission of K reference signals may be understood as: the first terminal device sending K reference signals is regarded as one time or a group of transmissions, and the first terminal device may send multiple times or multiple groups continuously.

[0031] In a possible implementation of the second aspect, satisfying the condition includes: each measurement result of K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of K reference signals in N consecutive measurements is greater than or equal to the first threshold, where N is an integer greater than or equal to 1, and each measurement result includes measurement results of K reference signals. Exemplarily, the feedback information includes only one first indication information, and the length of the first indication information in the feedback information can be 1 bit, which is used to indicate that each measurement result in N consecutive measurements is greater than or equal to the first threshold (i.e., used to indicate that the condition is satisfied). Or it is used to indicate: each measurement result in N consecutive measurements is less than or equal to the first threshold (i.e., used to indicate that the condition is not satisfied). Each measurement result includes measurement results of K reference signals. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0032] In a possible implementation of the second aspect, the condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the i-th reference signal is used to indicate: whether the measurement result of the i-th reference signal satisfies the condition or whether the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information can be 1 bit or can be greater than 1 bit, for example, 2 bits or 3 bits. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0033] In a possible implementation of the second aspect, the condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The first indication information corresponding to the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information can be 1 bit, or can be greater than 1 bit, for example, 2 bits or 3 bits. This can further reduce the amount of data required for feedback, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0034] In one possible implementation of the second aspect, the second indication information is used to indicate that measurement feedback information for the i-th reference signal among K reference signals includes K pieces of second indication information. One piece of second indication information is used to indicate a comparison result of a measurement result of one reference signal with a fifth threshold, where i is 1, 2, ..., K, and the feedback information includes K pieces of second indication information. The length of one piece of first indication information can be 1 bit, or can be greater than 1 bit, such as 2 bits or 3 bits. This can further reduce the amount of data required for feedback, as the feedback information or first indication information only requires 1 bit, further reducing communication resource consumption.

[0035] Exemplarily, at least one of the threshold range, the first threshold, the second threshold, the third threshold, the fourth threshold or the fifth threshold may be predefined, or may be indicated by the first terminal device to the second terminal device through signaling, or the first threshold may be preconfigured (or configured).

[0036] In a possible implementation of the second aspect, the time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located, and the first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K. In this implementation, the second terminal device can accurately determine the time domain position of the first time-frequency resource, thereby improving the accuracy and efficiency of receiving feedback information. The first terminal device and the second terminal device have a consistent understanding of the time domain position of the first time-frequency resource and which reference information is fed back on the first time-frequency resource, thereby ensuring the success rate and effectiveness of sending the feedback information.

[0037] In a possible implementation manner of the second aspect, the first time-frequency resource corresponds to a third beam, and the second beam is predefined or preconfigured.

[0038] Exemplarily, the third beam may be a transmitting beam of the second terminal device.

[0039] In a possible implementation of the second aspect, a second terminal device receives K reference signals from a first terminal device on K time-frequency resources, respectively. This includes: the second terminal device receives K reference signals and third indication information from the first terminal device on the K time-frequency resources, respectively, where the third indication information is used to indicate: the cumulative number of reference signals received by the second terminal device, or the third indication information is used to indicate the sequence number, index, or arrangement of the reference signals received by the second terminal device. Alternatively, the third indication information is used to indicate the reference signal number of the current reference signal in the order of the K reference signals from earliest to latest in the time domain, or the third indication information is used to indicate: the total number of reference signals sent by the first terminal device as of the current reference signal. When the second terminal device receives K reference signals on K time-frequency resources, it receives one reference signal and one third indication information on each time-frequency resource. The second terminal device needs to receive K third indication information, each third indication information corresponding to one reference signal or one beam. In this implementation, the third indication information is used to indicate the number of beam maintenance currently performed by the first and second terminal devices. The third indication information functions similarly to C-DAI. Through the third indication information, the second terminal device can effectively determine whether a reference signal (or beam) may be missed or there is a problem with the beam, and can quickly adjust the subsequent beam reception. It can also improve the accuracy and efficiency of receiving the reference signal, and can accurately determine the measurement results corresponding to each reference signal, thereby ensuring the accuracy of the feedback information.

[0040] In a third aspect, a communication device is provided, comprising: a module (e.g., a processing module and an interface module) for performing each step in the first aspect or any possible implementation of the first aspect, or a module (e.g., a processing module and an interface module) for performing each step in the second aspect or any possible implementation of the second aspect. The device may be a terminal device, or a chip, a chip system, or a processor in the terminal device.

[0041] The technical effects corresponding to the third aspect and any possible implementation method of the third aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0042] In a fourth aspect, a communications device is provided, comprising at least one processor and memory, wherein the at least one processor is configured to execute the method of the first aspect or any possible implementation of the first aspect, or the method of the second aspect or any possible implementation of the second aspect. The device may be a terminal device, or a chip, chip system, or processor in the terminal device.

[0043] The technical effects corresponding to the fourth aspect and any possible implementation method of the fourth aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0044] In a fifth aspect, a communication device is provided, comprising at least one processor and an interface circuit, wherein the at least one processor is configured to execute the method of the first aspect or any possible implementation of the first aspect, or the method of the second aspect or any possible implementation of the second aspect. The device may be a terminal device, or may be a chip, chip system, or processor in the terminal device.

[0045] The technical effects corresponding to the fifth aspect and any possible implementation method of the fifth aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0046] In a sixth aspect, a terminal device is provided, which includes the communication device provided in the third aspect, or the terminal device includes the communication device provided in the fourth aspect, or the terminal device includes the communication device provided in the fifth aspect.

[0047] The technical effects corresponding to the sixth aspect and any possible implementation method of the sixth aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0048] In the seventh aspect, a computer program product is provided, which includes a computer program, which, when executed by a processor, is used to execute the method in the above first aspect or any possible implementation of the first aspect, or the above second aspect or any possible implementation of the second aspect.

[0049] The technical effects corresponding to the seventh aspect and any possible implementation method of the seventh aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0050] In an eighth aspect, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed, it is used to execute the method in the above first aspect or any possible implementation of the first aspect, or the method in the above second aspect or any possible implementation of the second aspect.

[0051] The technical effects corresponding to the eighth aspect and any possible implementation method of the eighth aspect can be referred to the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here.

[0052] In the ninth aspect, a chip is provided, which includes: a processor for calling and running a computer program from a memory, so that a communication device equipped with the chip executes: the method in the above first aspect or any possible implementation of the first aspect, or the method in the above second aspect or any possible implementation of the second aspect.

[0053] The technical effects corresponding to the ninth aspect and any possible implementation method of the ninth aspect can be referred to the technical effects corresponding to the first aspect and any implementation method of the first aspect, or the technical effects corresponding to the second aspect and any implementation method of the second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of an example in which a base station uses SSB wide beam scanning and a UE uses wide beam scanning.

[0055] FIG2 is a schematic diagram showing an example in which different beams have different directions and different RSRPs corresponding to different beams.

[0056] FIG3 is a schematic diagram showing an example of the correspondence between an SSB index (index) and a PRACH channel (PRACH time-frequency resource).

[0057] FIG4 is a schematic diagram of an example in which a base station sends a downlink signal to a UE using an optimal CSI-RS for BM beam.

[0058] FIG5 is a schematic diagram of an example of an offset value between a time slot where PDSCH data is located and a time slot where HARQ feedback of the PDSCH is located.

[0059] FIG6 is a schematic diagram of an example of an offset value between a time slot where HARQ feedback is located and a time slot where all PDSCH data corresponding to the HARQ feedback are located.

[0060] FIG7 is a schematic diagram of an example of a semi-static codebook.

[0061] FIG8 is a schematic diagram of an example of a DAI value in downlink data transmission.

[0062] FIG9 is a schematic diagram of an example of using a semi-static codebook and a dynamic codebook.

[0063] FIG10 is a schematic diagram of another communication system provided in an embodiment of the present application to which the method provided in the present application can be applied.

[0064] FIG11 is a schematic interaction diagram of a method for transmitting information on a side link provided in an embodiment of the present application.

[0065] Figure 12 is a schematic diagram of an example of K time-frequency resources and a first time-frequency resource provided in an embodiment of the present application.

[0066] FIG13 is a schematic diagram of an example of periodic transmission of K reference signals provided in an embodiment of the present application.

[0067] Figure 14 is a schematic diagram of the content included in the feedback information sent by the second terminal device to the first terminal device according to an embodiment of the present application.

[0068] Figure 15 is a schematic diagram of another example of the content included in the feedback information sent by the second terminal device to the first terminal device provided in an embodiment of the present application.

[0069] Figure 16 is a schematic diagram of an example in which K time-frequency resources are periodic, provided in an embodiment of the present application.

[0070] Figure 17 is a schematic diagram of an example provided by an embodiment of the present application in which a first terminal device sends a reference signal and a third indication information on each of K time-frequency resources.

[0071] Figure 18 is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0072] Figure 19 is a schematic block diagram of another communication device provided in an embodiment of the present application.

[0073] Figure 20 is a schematic block diagram of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] The technical solution in this application will be described below with reference to the accompanying drawings.

[0075] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0076] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, unless otherwise specified, "plurality" means two or more.

[0077] In an embodiment of the present application, a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as a browser, an address book, a word processing software, and an instant messaging software. In addition, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided in the embodiment of the present application. As long as it is possible to communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application, for example, the execution subject of the method provided in the embodiment of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call a program and execute the program.

[0078] In addition, various aspects or features of the present application can be implemented as methods, devices or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0079] Wireless communication technology has experienced rapid development over the past few decades, evolving from the first generation of analog wireless communication systems, to the second generation (2G) wireless communication systems represented by the Global System for Mobile Communications (GSM), to the 3G wireless communication systems represented by Wideband Code Division Multiple Access (WCDMA), and finally to the long-term evolution (LTE) 4G wireless communication systems and 5G wireless communication systems, which have now been widely commercialized and achieved great success worldwide. The services supported by wireless communication systems have also evolved from voice and text messaging to wireless high-speed data communication. At the same time, the number of wireless connections worldwide is experiencing continued rapid growth, and a variety of new wireless service types are emerging, such as the Internet of Things and autonomous driving. These have placed higher demands on the next generation of wireless communication systems, namely 5G systems.

[0080] With the increasing number of communication scenarios, device-to-device (D2D) communication technology has seen rapid growth in recent years due to its ability to enable direct communication with or without network infrastructure. The application of D2D communication technology can reduce the burden on cellular networks, reduce battery consumption in user devices, increase data rates, and effectively meet the needs of proximity services.

[0081] Generally speaking, D2D communication technology refers to direct communication between two user devices (UEs) or multiple user equipment (UEs). Typical D2D technologies include Bluetooth, wireless fidelity (WiFi), and WiFi-Direct. In wireless communication networks defined by the 3rd Generation Partnership Project (3GPP), the air interface for direct communication between UEs is called the PC5 interface, so direct communication between UEs is also called PC5 communication. From a link perspective, the link between UEs is called the sidelink (SL), corresponding to the uplink (UL) and downlink (DL) in current communication systems.

[0082] SL communication encompasses a variety of use cases, such as vehicle-to-everything (V2X) and communication between smart devices. V2X, also known as the "Internet of Vehicles," is communication between cars and other vehicles or devices that may affect them. This includes vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-infrastructure (V2I), and vehicle-to-network (V2N). Typical scenarios for communication between smart devices include mobile phones and wearable devices, augmented reality (AR) / virtual reality (VR) headsets or glasses and smart screens, and sensor-to-sensor communication.

[0083] Wireless communication systems are categorized into licensed and unlicensed frequency bands based on the frequency bands used. In licensed frequency bands, user equipment (UEs) utilize spectrum resources based on scheduling by a central node (e.g., a base station). In LTE communication systems, cellular mobile communications have begun researching unlicensed frequency bands, leading to the development of technologies such as LTE in unlicensed spectrum (LTE-U), Licensed Assisted Access (LAA), and Multi-Fire. However, unlicensed frequency bands were already used by some wireless communication devices, such as Wi-Fi. The LTE system introduced a listen-before-talk (LBT) mechanism to enable coexistence with Wi-Fi devices and enable LTE Uu interfaces in unlicensed frequency bands. The Uu interface can also be understood as the communication interface between user equipment (UE) and radio access network (RAN) equipment (e.g., a base station). In addition to the Uu interface, there is also the PC5 interface, which is the communication interface between UEs. Enabling SL communication in unlicensed spectrum within a local area is a key evolutionary direction. The corresponding protocol technologies are collectively referred to as sidelink in unlicensed spectrum (SL-U). Similar to the Uu interface, UEs operating through SL-U also need to coexist with nearby Wi-Fi devices based on the LBT mechanism.

[0084] In addition, user equipment using D2D technology is generally a half-duplex device, that is, the user equipment can only be in the state of receiving or sending information at the same time and does not have the ability to send and receive simultaneously.

[0085] The following is a brief introduction to some relevant terms and communication technologies involved in this application.

[0086] First: beam.

[0087] A beam (BM) is a communication resource. A beam can be a wide beam, a narrow beam, or other types of beams. The technology for forming the beam can be beam forming technology or other technical means. Beam forming technology can specifically be digital beam forming technology, analog beam forming technology, and hybrid digital / analog beam forming technology. Different beams can be considered as different resources. The same information or different information can be sent through different beams. Optionally, multiple beams with the same or similar communication characteristics can be regarded as one beam. A beam can include one or more antenna ports for transmitting data channels, control channels, and sounding signals, etc.

[0088] A beam, which can also be understood as a spatial resource, can refer to a transmitting or receiving precoding vector with energy transmission directivity. Energy transmission directivity can refer to the fact that within a certain spatial position, the signal received after precoding processing by the precoding vector has better receiving power, such as satisfying the receiving demodulation signal-to-noise ratio, etc. Energy transmission directivity can also refer to the fact that the same signal sent from different spatial positions received through the precoding vector has different receiving powers. The same device (such as a network device or a terminal device) can have different precoding vectors, and different devices can also have different precoding vectors, that is, corresponding to different beams. According to the configuration or capability of the device, a device can use one or more of multiple different precoding vectors at the same time, that is, it can form one beam or multiple beams at the same time. From the perspectives of transmission and reception, beams can be divided into transmitting beams and receiving beams.

[0089] Transmit beam: A transmitting device (also called a transmitter) transmits signals using certain beamforming weights, forming a spatially directional beam. In the uplink, the transmitting device can be a terminal device (also called a user equipment); in the downlink, the transmitting device can be a network device (also called a radio access network device). In other words, a transmit beam is a directional beam transmitted using beamforming technology using multiple antennas.

[0090] Receive beam: The receiving device receives signals using specific beamforming weights, forming a spatially directional beam. In the uplink direction, the receiving device can be a network device; in the downlink direction, the receiving device can be a terminal. In other words, a receive beam is a directional beam that receives signals, aiming as closely as possible toward the direction of the transmit beam to further improve the received signal-to-noise ratio and minimize interference between users.

[0091] Transmit beamforming: When a transmitting device with an antenna array transmits a signal, it sets a specific amplitude and phase on each antenna element in the array. This creates a certain spatial directionality in the transmitted signal, meaning that the signal power is high in some directions and low in others. The direction with the highest signal power defines the direction of the transmit beam. The antenna array consists of multiple antenna elements, and the specific amplitude and phase values ​​assigned to each element are known as beamforming weights.

[0092] Receive beamforming: When a receiving device with an antenna array receives a signal, it sets a specific amplitude and phase on each antenna element in the array. This ensures that the power gain of the received signal is directional. Specifically, the power gain is high when receiving signals from certain directions, and low when receiving signals from other directions. The direction with the highest power gain is the direction of the receive beam. The antenna array consists of multiple antenna elements, and the specific amplitude and phase values ​​assigned to them are the beamforming weights.

[0093] Optionally, in the embodiment of the present application, “sending a signal using a certain transmit beam” may also be expressed as: sending a signal using a certain beamforming weight. “Receiving a signal using a certain receive beam” may also be expressed as: receiving a signal using a certain beamforming weight.

[0094] Optionally, in an embodiment of the present application, "beam" may also be referred to as a spatial filter, or a spatial filter or spatial parameters, the transmitting beam may also be referred to as a spatial transmitting filter, and the receiving beam may also be referred to as a spatial receiving filter.

[0095] Different beams can be considered different resources or different beamforming weights. Using different beams can send the same or different information. A beam pair is based on the concept of beams: a transmit beam and a receive beam that are paired. A beam pair typically consists of a transmit beam from a transmitting device and a receive beam from a receiving device.

[0096] In communication systems such as 5G New Radio (NR) systems, both network equipment and terminal devices can generate one or more transmit beams and one or more receive beams. Before data transmission, beam alignment is required.

[0097] Second: reference signals and reference signal resources.

[0098] Reference signals can be used for channel measurement or estimation. Reference signal resources can be used to configure reference signal transmission properties, such as time-frequency resource location, port mapping, power factor, and scrambling code. Transmitting devices can send reference signals based on reference signal resources, and receiving devices can receive reference signals based on reference signal resources.

[0099] The channel measurement involved in this application also includes beam measurement, that is, obtaining beam quality information by measuring the reference signal. The parameters used to measure the beam quality include, but are not limited to, reference signal receiving power (RSRP). For example, beam quality can also be measured by parameters such as reference signal receiving quality (RSRQ), signal-noise ratio (SNR), signal to interference plus noise ratio (SINR), block error rate (BLER), and channel quality indicator (CQI).

[0100] Reference signals may include, for example, CSI-RS, synchronization signal block (SSB), sounding reference signal (SRS), demodulation reference signal (DMRS), etc. Correspondingly, reference signal resources may include CSI-RS resources, SSB resources, and SRS resources.

[0101] It should be noted that the above-mentioned SSB can also be called synchronization signal / physical broadcast channel block (SS / PBCH block), and the corresponding SSB resource can also be called synchronization signal / physical broadcast channel block resource (SS / PBCH block resource), which can be abbreviated as SSB resource.

[0102] To distinguish different reference signal resources, each reference signal resource may correspond to a reference signal resource identifier, such as a CSI-RS resource indicator (CRI), an SSB resource indicator (SSBRI), or an SRS resource index (SRI). The SSB resource identifier may also be referred to as an SSB index.

[0103] It should be understood that the reference signals and corresponding reference signal resources listed above are only exemplary and should not constitute any limitation to this application. This application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0104] Third: The process of beam training in NR Uu.

[0105] In the embodiment of the present application, NR Uu can be understood as the communication between terminal devices and network devices (such as base stations) in 5G.

[0106] The NR Uu downlink beam management process is described in detail below, which specifically includes three processes, namely P1 process: coarse alignment process of the base station and the user equipment; P2 process: base station fine adjustment process; P3 process: UE fine adjustment process.

[0107] P1 coarse alignment process: The base station uses SSB wide beam scanning, and the UE uses wide beam scanning.

[0108] For example, as shown in Figure 1, Figure 1 is a schematic diagram of a base station using SSB wide beam scanning and a UE using wide beam scanning. The base station sends SSBs in different directions using different beams (such as the four beams in four different directions shown in Figure 1). In other words, each SSB is sent using a different beam, and each SSB corresponds to a beam. The UE receives the SSB using a receiving beam (or wide beam) and measures the SSB to obtain a measurement result (such as RSRP) for each SSB. The base station changes the direction of the SSB beam at different times, and the UE measures the reception strength of the SSB in different directions to determine the optimal SSB beam at that time. As shown in Figure 2(a), the directions of the four different beams are different. As shown in Figure 2(b), the RSRP corresponding to different beams is different.

[0109] The following describes the SSB beam determination process for downlink signals sent by the base station side according to the two states of the UE:

[0110] The first method is to send the optimal SSB beam (i.e., the beam corresponding to the SSB with the highest reception strength) to the base station by including the SSB index information in the random access preamble. The base station then determines the SSB beam to be used for subsequent downlink signal transmission based on the SSB index (the SSB index and beam are mapped). The base station can directly reuse this beam when receiving uplink signals.

[0111] The second method: If the UE is in the connected data transmission phase, it reports the SSB measurement results to the base station via a measurement report. The base station then determines the optimal SSB beam (i.e., the beam corresponding to the SSB with the highest reception strength) as the transmit beam for subsequent downlink signals. The base station can directly reuse this beam when receiving uplink signals.

[0112] The wide beam receiving downlink signal at the UE side is determined as follows:

[0113] When receiving SSB signals, the UE uses beam scanning to receive signals based on the SSB time-frequency resource locations reported in the system message (in the idle state initial access phase) or the RRC reconfiguration message (in the connected state data transmission phase). This determines the wide beam that the UE receives downlink signals. The UE can then directly reuse this beam when transmitting uplink signals.

[0114] The UE needs to match the measured RSRP of the SSB with the 6-bit SSB index. Therefore, the UE demodulates the DMRS from the physical broadcast channel (PBCH) to obtain the lowest 3 bits, and also obtains the highest 3 bits from the PBCH payload bits. After combining them, the sequence number of the received SSB (i.e., the SSB index) is obtained.

[0115] As shown in Figure 3, since the SSB index and the PRACH channel (i.e., PRACH time-frequency resource) have a corresponding relationship, the UE determines the corresponding PRACH time-frequency resource based on the index of the detected SSB, and then sends a preamble to the base station on the determined PRACH time-frequency resource. The base station can determine the corresponding SSB index by receiving the preamble on the corresponding PRACH channel, and thus determine the corresponding beam based on the SSB index. When the base station sends SSBs on different beams, the UE can obtain the optimal beam information by measuring the RSRP of the SSB, and then provide feedback on the corresponding PRACH time-frequency resource. The base station can then obtain the optimal beam information reported by the UE based on the PRACH channel.

[0116] Through the above-mentioned P1 process, the base station can determine the optimal SSB beam.

[0117] P2 process: The base station fine-tuning process (the base station performs CSI-RS for BM beam scanning). "CSI-RS for BM beam" can be understood as: the optimal beam obtained by beam measurement using CSI-RS.

[0118] The base station scans again with a narrower CSI-RS for BM beam near the optimal SSB beam. For example, the base station can map the CSI-RS time-frequency resources to the optimal SSB beam through the beam identifier (ID). In other words, the base station determines multiple beams near the optimal SSB beam, and then uses these beams to send CSI-RS to the UE respectively. The UE measures the CSI-RS on different beams and feeds back the CSI-RS measurement results to the base station through a measurement report. Based on the CSI-RS measurement results, the base station determines the optimal CSI-RS beam (i.e., the beam corresponding to the CSI-RS with the greatest receiving strength) as the transmit beam (Tx beam) used for subsequent downlink signal transmission. The base station can directly reuse this beam when receiving uplink signals.

[0119] Through the above P2 process, the base station can determine the optimal CSI-RS for BM beam.

[0120] P3 process: UE fine-tuning process.

[0121] As shown in Figure 4, the base station uses the optimal CSI-RS for BM beam (i.e., the CSI-RS for BM beam is fixed) to send downlink signals to the UE. Specifically, the base station sends the CSI-RS to the UE on the optimal beam determined by the CSI-RS. When receiving signals, the UE uses beam scanning to receive signals based on the CSI-RS for BM time-frequency resource location indicated in the RRC configuration message sent by the base station, thereby determining the narrow beam in which the UE receives downlink signals. The UE can directly reuse this beam when sending uplink signals.

[0122] Through the above P3 process, the UE can determine the optimal beam.

[0123] Through the above-mentioned P1 to P3 processes, multiple beam pairs can be determined between the base station and the UE. A beam pair includes a transmit beam and a receive beam. After the base station and the terminal device establish a connection, in order to avoid changes in the optimal beam pair caused by relative position movement or channel changes, the NR Uu measures the pairing between the corresponding beam pairs through the beam maintenance process. In NR Uu, the base station sends CSI-RS signals by using different beams, and then the terminal measures the CSI-RS and reports the measurement results (such as RSRP, etc.) to the base station through the media access control element (MAC CE).

[0124] Similarly, when the sidelink reuses the above-mentioned NR Uu beam scanning process, the above-mentioned P1-P3 process can be referred to. For example, the UEs first use the sidelink SSB (SL-SSB) synchronization signal to complete the coarse beam alignment process, and then complete the P2 and P3 processes (fine beam alignment) through the sidelink CSI-RS (SL CSI-RS).

[0125] Fourth: Hybrid Automatic Repeat Request (HARQ) codebook.

[0126] The HARQ codebook can be understood as an arrangement of the positive acknowledgement (ACK) / negative acknowledgement (NACK) information corresponding to the PDSCH that needs to be fed back in a certain uplink time unit, which contains two meanings: First, which PDSCH ACK / NACKs are included in the HARQ codebook. Second, the order in which these PDSCH ACK / NACKs are arranged in the codebook. In other words, the feedback information ACK / NACKs of multiple PDSCHs that need to be sent in the same uplink time unit are arranged in a certain order into a string of continuous bits to form a HARQ codebook. Based on the HARQ codebook, the UE will feed back multiple bits of HARQ feedback information corresponding to multiple downlink transport blocks (TBs) or code block groups (CBGs) to the base station at one time, effectively improving the efficiency of HARQ feedback.

[0127] The base station defines the HARQ feedback state based on the information fed back by the UE (bit value is 1 or 0). The HARQ feedback state includes ACK, NACK, and discontinuous transmission (DTX).

[0128] ACK is a status defined by the base station based on the bit value of 1 (indicating correct reception) fed back by the UE, indicating that the transmission was successful;

[0129] NACK is a status defined by the base station based on the bit value of 0 (indicating erroneous reception) fed back by the UE, indicating that the transmission has failed;

[0130] DTX is a state defined when the base station does not receive feedback information from the UE, indicating that the transmission has failed.

[0131] It should be understood that only during downlink transmission does the receiver (UE) need to send HARQ feedback to the transmitter (base station). For uplink transmission, because both the receiver and scheduler are on the base station side, when the base station detects a decoding error, it can directly notify the UE to perform uplink retransmission without instructing the UE via HARQ feedback.

[0132] After clarifying the HARQ feedback status, the UE also needs to know when to send HARQ feedback. The base station can control the transmission timing through the value K1 indicated by the HARQ feedback timing field (PDSCH-to-HARQ-timing field) in the downlink control information (DCI). The HARQ feedback timing field K1 represents the time slot offset value between the PDSCH data and the UE sending the HARQ feedback information. The base station can control the transmission timing through the HARQ feedback timing field K1 in the DCI. If the UE receives PDSCH data in time slot n, the UE will send the corresponding HARQ feedback information in time slot n+K1. For example, as shown in Figure 5, assuming that the UE receives PDSCH data in time slot 0 and the value of K1 is 6, the UE needs to feed back the HARQ feedback of the PDSCH to the base station in time slot 6.

[0133] The HARQ feedback sequence sent at the same time domain position is called a HARQ codebook (HARQ-ACK codebook). The HARQ codebook can contain one or more HARQ feedbacks, which can include TB-level HARQ feedback or CBG-level HARQ feedback. In the carrier aggregation scenario, it may also include HARQ feedback for multiple subcarriers.

[0134] For example, as shown in FIG6 , the UE needs to feed back HARQ feedback corresponding to PDSCH1 (downlink data 1) on time slot 0, PDSCH2 (downlink data 2) on time slot 1, and PDSCH3 (downlink data 3) on time slot 2 to the base station in time slot 6. The K1 value corresponding to time slot 0 is 6, the K1 value corresponding to time slot 0 is 5, and the K1 value corresponding to time slot 0 is 4.

[0135] The HARQ codebook includes a dynamic codebook mode and a semi-static codebook mode. The HARQ-ACK codebook is generated differently in different codebook modes, which will be briefly introduced below.

[0136] First: semi-static codebook:

[0137] Semi-static codebook: also known as Type 1 HARQ Codebook. The process of determining the semi-static codebook is divided into the following steps: 1) The terminal device determines that the time slot for sending ACK / NACK feedback information is the i-th time slot. The specific time slot i is determined based on the physical downlink control channel (PDCCH) corresponding to the PDSCH. Assuming that there is a PDCCH in time slot n scheduling PDSCH to send PDSCH in time slot n+K0, and indicating that the ACK / NACK feedback information corresponding to the PDSCH is in time slot n+K0+K1, then the time slot n+K0+K1 is time slot i. 2) The possible values ​​K1 set (K1 set) of K1 are obtained according to the configuration information sent by the high-level signaling. Based on the above information, the terminal device determines the time slots where all PDSCHs that are to send feedback information in the i-th time slot are located. 3) The ACK / NACK corresponding to the PDSCH in each time slot of all the time slots where the PDSCH is located is concatenated in the order from front to back in the time domain, and all time slots are in the order of carrier frequency or serving cell index to generate a HARQ codebook and feedback on time slot n+K0+K1.

[0138] In other words, for a semi-static codebook, once the higher-layer parameters configure the K1 set, the UE will feedback the HARQ information of the time slots in each uplink time slot corresponding to each K1 value included in the K1 set before the current time slot, unless the following conditions occur:

[0139] These time slots are uplink time slots themselves, and therefore the HARQ information of the time slots is not fed back.

[0140] If a bandwidth part (BWP) switching occurs on the UE, the feedback starts from the downlink time slot after the BWP switching is completed, and the HARQ information of the time slot before the switching is discarded.

[0141] For example, Figure 7 shows a schematic diagram of a semi-static codebook. In the example shown in Figure 7, taking an 8:2 timeslot ratio as an example, "D" represents a downlink timeslot, "U" represents an uplink timeslot, and "S" represents an uplink and downlink coexistence slot. Assuming that the UE can simultaneously receive data from up to three component carriers (CCs), and the K1 set received by the UE is {1, 3, 4, 6}, then for the target HARQ feedback timeslot (taking slot 8 as an example), the UE will feedback HARQ information on slots 2, 4, 5, and 7 in slot 8, indicating whether the UE has received data in these physical timeslots.

[0142] In the example shown in Figure 7:

[0143] Carrier 1 transmits and feeds back data based on a single TB, and data is transmitted on slots 2, 4, 5, and 7.

[0144] Carrier 2 transmits and provides feedback based on TBs, and a time slot can transmit up to two TBs. One TB is transmitted on slot 2, two TBs are transmitted on slot 5, and no data is transmitted on the remaining two time slots (slots 4 and 7).

[0145] Carrier 3 transmits and feedback based on CBGs, and a maximum of four CBGs can be transmitted in one time slot. Four CBGs are transmitted in slot 2, two CBGs are transmitted in slot 5, and no data is transmitted in the remaining two time slots (slot 4 and slot 7).

[0146] Assuming that the data on each carrier is correctly received by the UE, the HARQ information that needs to be fed back on slot 8 is a bit sequence consisting of the feedback sequence of carrier 1, the feedback sequence of carrier 2, and the feedback sequence of carrier 3. Specifically, it includes:

[0147] The UE receives only one TB on carrier 1. Therefore, the HARQ information fed back for each downlink transmission on carrier 1 (i.e., each time slot in slots 2, 4, 5, and 7) is one bit, represented by "①". For carrier 1, one bit of feedback is required for each time slot in slots 2, 4, 5, and 7, and the feedback sequence on carrier 1 requires four bits.

[0148] The UE can simultaneously receive up to two TBs on carrier 2. Therefore, the HARQ information feedback for each downlink transmission on carrier 2 is 2 bits. Even if only one TB is received in slot 2, the bits corresponding to the unreceived TB will be fed back as NACKs. For carrier 2, each time slot in slots 2, 4, 5, and 7 requires 2 bits of feedback, represented as "②③" respectively. The feedback sequence on carrier 2 requires 8 bits.

[0149] Carrier 3 uses CBG transmission, and the maximum number of CBGs that can be transmitted is four. Therefore, the HARQ information feedback for each downlink transmission on carrier 3 is four bits. Although only two CBGs are received in slot 5, a NACK is also fed back for the bits corresponding to the CBGs that did not receive data. For carrier 3, four bits of feedback are required for each time slot in slots 2, 4, 5, and 7, represented as "④⑤⑥⑦" respectively. The feedback sequence on carrier 3 requires 16 bits.

[0150] As shown in Figure 7, for each time slot in slot 2, slot 4, slot 5 and slot 7, 7 bits need to be fed back in time slot 8 (corresponding to carriers 1 to 3, different TBs or different CBGs), where the feedback information of each time slot is in the order from early to late: ①②③④⑤⑥⑦.

[0151] In the example shown in Figure 7, the Type 1 semi-static codebook feedback sequence contains 28 bits, but only 13 bits are actually valid feedback. Therefore, the disadvantage of the Type 1 semi-static codebook is that it consumes more resources because HARQ feedback is required regardless of whether the corresponding TB or CBG is transmitting data.

[0152] First: dynamic codebook:

[0153] Dynamic codebook: Also known as Type 2 HARQ codebook. The terminal device detects the PDCCH at each PDCCH monitoring occasion and uses the Time Domain Resource Allocation field and the PDSCH-to-HARQ-timing field in the detected PDCCH. It first determines the PDSCH timeslot number based on the PDCCH-to-PDSCH timeslot offset value K0 contained in the Time Domain Resource Allocation field and the timeslot number of the PDCCH. For example, if the PDCCH is in timeslot n, then based on K0, the PDSCH timeslot number is determined to be n+K0. It then uses the PDSCH-to-HARQ-timing field to obtain the HARQ-ACK timing, i.e., the timeslot offset value K1 from the PDSCH to the corresponding ACK / NACK feedback, to determine the timeslot number of the corresponding ACK / NACK feedback. For example, if the PDSCH is in timeslot n+K0, then the timeslot number of the ACK / NACK feedback corresponding to the PDSCH is determined to be n+K0+K1. All ACK / NACKs that need to be sent in the same time slot are concatenated in the order of the PDCCHs of the PDSCHs corresponding to the ACK / NACKs from front to back in the time domain to generate a HARQ-ACK codebook. For example, in the time slot numbered n+K0+K1, ACK / NACK feedback information corresponding to four data PDSCHs 1 to PDSCH 4 is to be sent, and the PDCCHs corresponding to PDSCHs 1 to PDSCH 4 are PDCCH 1 to PDCCH 4, which are in the order from front to back in the time domain. In this case, the feedback information of PDSCH 1 to PDSCH 4 is concatenated in sequence to generate a HARQ codebook.

[0154] As can be seen, a dynamic codebook differs from a semi-static codebook in that the UE only sends HARQ feedback information for locations with data transmission. This means that the codebook size changes dynamically with the number of scheduled carriers, TBs, or CBGs. For the example shown in Figure 7, using a dynamic codebook, the HARQ feedback sequence only requires 13 bits (all feedback is ACK).

[0155] If DCI reception is normal, the dynamic codebook has a clear advantage in resource consumption. However, if DCI reception is abnormal, the number of HARQ feedback information sent by the UE may be inconsistent with the number of TBs or CBGs sent by the base station, which will prevent all feedback contained in the current codebook from being correctly received.

[0156] To solve this problem, the NR protocol uses the downlink assignment index (DAI) field in the DCI to indicate the number of HARQ feedback messages that the UE needs to send. The DAI field is divided into the following two parts:

[0157] Counter DAI (C-DAI): Indicates the number of downlink scheduled transmissions of TBs or CBGs from the moment the DCI was received to the current moment. In other words, C-DAI indicates the number of downlink transmissions scheduled up to the time of the DCI. C-DAI counts in the carrier dimension first, then the time domain dimension.

[0158] Total DAI (T-DAI) in a carrier aggregation configuration indicates the total number of downlink transmissions on all carriers to date. In other words, T-DAI indicates the total number of downlink transmissions on all carriers up to the monitoring occasion (MO) where the DCI is located.

[0159] Both C-DAI and T-DAI are decimal, but are actually represented by 2-bit loopback. That is, the signaling uses the modulo 4 modulus of the decimal count value.

[0160] For example, as shown in Figure 8, Figure 8 shows a schematic diagram of DAI values ​​in downlink data transmission. In the example shown in Figure 8, each box in Figure 8 represents a time slot, and each time slot transmits a TB (i.e., a data packet). Assume that the base station needs to transmit a total of 8 data packets. DAI (x, y) means: the C-DAI value is x, and the T-DAI value is y. For example, DAI (0, 1) means that the current transmission is the first data packet, and a total of 2 data packets have been transmitted so far. DAI (5, 5) means that the current transmission is the sixth data packet, and a total of 6 data packets have been transmitted so far. DAI (7, 7) means that the current transmission is the eighth data packet, and a total of 8 data packets have been transmitted so far. Assume that when time slot 3 on carrier 1 experiences packet loss, the UE will not receive the data packet with DAI (6, 7). That is, after receiving the data packet with DAI (5, 5), the UE skips receiving the data packet with DAI (6, 7) and receives the data packet with DAI (7, 7). The UE can know that 8 confirmation messages need to be fed back based on the DAI of (7, 7), and can determine that the 7th data is lost based on the received data packet with DAI of (5, 5) and the data packet with DAI of (7, 7) and the value of C-DAI (the value of C-DAI is 7, indicating that the current transmission is the 8th data packet).

[0161] In the example shown in FIG8 , if a dynamic codebook is used, as shown in FIG9 , with carrier order ascending first and time slot order ascending second, the dynamic codebook requires 8 bits of feedback information. If a semi-static codebook is used, as shown in FIG9 , with time slot order ascending first and carrier order ascending second, the semi-static codebook requires 12 bits of feedback information.

[0162] In NR Uu, the base station and UE maintain beams (or beam pairs) using CSI-RS reference signals and report CSI-RS RSRP and other measurement results via MAC CE. One reference signal (e.g., CSI-RS) corresponds to one CSI-RS measurement report (CSI-reporting), or in other words, one beam pair corresponds to one CSI-RS measurement report. Due to the large range of RSRP, NR Uu requires 7 bits to quantize the RSRP value. This means that the measurement report corresponding to one CSI-RS requires 7 bits. This 7-bit quantization information corresponds to an RSRP range of [-140, -44] dBm, with a step size of 1 dB between the maximum and minimum RSRP values.

[0163] For the sidelink, for example, for the sidelink in frequency range 2 (FR2), if reference signals such as CSI-RS are also used to maintain the beam, and a beam pair quantizes the measurement results of the reference signals by 7 bits. Since multiple sets of beam pairs need to be maintained between a communication pair (a communication pair is a communication pair consisting of a UE and another UE), each (each set of) beam pairs requires 7 bits to quantize the measurement results of the reference signals, resulting in a lot of communication resources being needed to feedback the measurement results of the reference signals (i.e., beams) between a communication pair. The amount of data that needs to be fed back is very large, and the communication resources are consumed seriously. In addition, a UE can also establish communication pairs with multiple other UEs. In this case, the amount of data that needs to be fed back will be very large, and the communication resources will be consumed even more seriously.

[0164] In view of this, the present application provides a method for information transmission on a side link, which aggregates the feedback information (i.e., measurement results) corresponding to multiple beams (i.e., multiple beam pairs) and sends them together, and the feedback information of each beam does not directly indicate the measurement result of the beam, for example, the measurement result includes at least one of: RSRP, RSRQ, SNR, BLER or SINR, but indicates the comparison result of the beam measurement result with a threshold, or indicates whether the beam measurement result meets the conditions. The information length required to indicate whether the measurement result meets the conditions or the comparison result is less than the information length used to directly indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back. In other words, the comparison results of the measurement results of multiple reference signals with the threshold, or the feedback of whether the measurement results of multiple reference signals meet the conditions, are fed back within the same time unit, instead of directly feeding back the measurement results of multiple reference signals, and different reference signals correspond to different beam directions (different reference signals are sent using different beams). The length of information used to indicate whether the comparison result or measurement result meets the conditions is less than the length of information used to directly indicate the measurement result, which can effectively reduce the amount of data required for feedback, reduce the length of the feedback information and the communication resources required for the feedback information. In this way, the amount of data required for feedback can be effectively reduced, thereby reducing the consumption of communication resources.

[0165] The following is an illustrative description of a communication system to which the method provided in this application can be applied.

[0166] The method provided in this application can be applied in the scenario of sidelink communication.

[0167] For example, FIG10 shows a schematic diagram of a communication system to which the method provided in this application can be applied. As shown in FIG10 a, terminal device 1 and terminal device 2 are both within the coverage range of the same network device. As shown in FIG10 b, terminal device 1 is within the coverage range of the network device, while terminal device 2 is not. As shown in FIG10 c, terminal device 1 is within the coverage range of network device 1, while terminal device 2 is within the coverage range of network device 2. Terminal device 1 can communicate with terminal device 2 using sidelink communication resources through base station scheduling. The communication resources may include licensed frequency bands and unlicensed frequency bands. Alternatively, terminal device 1 may communicate without using base station scheduling mode, and instead select resources from a resource pool, i.e., select resources for sidelink communication from the resource pool. The resources may include licensed frequency bands and unlicensed frequency bands. As shown in FIG10 d, terminal device 1 and terminal device 2 are both not within the coverage range of the same network device, i.e., both are in non-coverage ranges. Therefore, terminal device 1 and terminal device 2 can establish a sidelink for communication using resource self-selection.

[0168] It is understood that the spectrum used for communication on the sidelink can be an unlicensed band, a licensed band, or a dedicated band. Before using the unlicensed band for transmission, channel access must meet certain requirements, such as the need to perform LBT. This is not limited in the present embodiment.

[0169] Optionally, in an embodiment of the present application, the network device may also be referred to as: access network device, wireless access network device, wireless access network (RAN) node, RAN entity or access node, etc., constituting a part of the communication system to help terminal devices (including low-speed terminal devices and high-speed terminal devices) achieve wireless access.

[0170] In one possible scenario, a network device can be any device with wireless transceiver capabilities. Examples include: traditional macro base stations (evolved node B, eNBs) in traditional Universal Mobile Telecommunications System (UMTS) and LTE communication systems; micro base stations (eNBs) in heterogeneous network (HetNet) scenarios; baseband processing units (BBUs) and remote radio units (RRUs) in distributed base station scenarios; baseband pool (RRUs) in cloud radio access network (CRAN) scenarios; gNBs in future wireless communication systems, 3GPP-derived base stations, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc. Base stations can include: macro base stations, micro base stations, pico base stations, small cells, relay stations, or balloon base stations. Network devices can also be servers, wearable devices, or in-vehicle devices.

[0171] In another possible scenario, the network device may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, etc. Optionally, the network device may also be a relay node or a host node, or a wireless controller in a CRAN scenario. Optionally, the network device may also be an access network device in V2X technology, such as a road side unit (RSU). All or part of the functions of the network device in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The network device in this application may also be a logical node, logical module or software that can implement all or part of the functions of a wireless access network device.

[0172] In NR technology, a network device (e.g., gNB) can consist of a gNB Centralized Unit (CU) and one or more gNB Distributed Units (DU). The gNB-CU and gNB-DU are different logical nodes and can be deployed on different physical devices or on the same physical device.

[0173] In the embodiments of the present application, the terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as D2D, V2X communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0174] It should be understood that the communication system shown in FIG10 is merely exemplary and should not impose any limitations on the communication systems applicable to the embodiments of the present application. For example, the communication system shown in FIG10 may further include more or smaller terminal devices, and the network devices or terminal devices included in the communication system shown in FIG10 may be the various forms of network devices or terminal devices described above. The embodiments of the present application are not shown one by one in the figures.

[0175] The method provided by this application is described below with reference to specific examples.

[0176] It should be understood that in the embodiments of the present application, the method is described using a terminal device as an example of an execution subject of the method. As an example and not a limitation, the terminal device in the present application may also be a chip, a chip system, or a processor that supports the terminal device to implement the method. The embodiments of the present application are not limited thereto.

[0177] Figure 11 is a schematic interactive diagram of a method for information transmission on a side link provided by an embodiment of the present application. The method 1100 can be applied in the scenario shown in Figure 10, and of course can also be applied in other side link communication scenarios. The embodiment of the present application does not limit this.

[0178] As shown in Figure 11 , the method 1100 shown in Figure 11 may include steps S1110 to S1130. The following describes each step in the method 1100 in detail with reference to Figure 11 .

[0179] S1110, the first terminal device sends K reference signals to the second terminal device on K time-frequency resources respectively, different time-frequency resources among the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1.

[0180] Correspondingly, the second terminal device receives K reference signals from the first terminal device on K time-frequency resources respectively.

[0181] It should be understood that in an embodiment of the present application, the K reference signals correspond to different beams, respectively, that is, the K reference signals are sent by the first terminal device using different beams, and the directions of different beams (i.e., K beams) are different. In other words, different time-frequency resources among the K time-frequency resources correspond to different beam directions. The first terminal device sends K reference signals to the second terminal device on the K time-frequency resources using different beams, and each time-frequency resource is used to send a reference signal. In other words, the first terminal device sends a total of K reference signals to the second terminal device on the K time-frequency resources. Optionally, the reference signal identifiers corresponding to the K reference signals are different, and different beams can be indicated by different reference signal identifiers.

[0182] Exemplarily, different time-frequency resources among the K time-frequency resources do not overlap in the time domain. In other words, the K time-frequency resources are arranged in order from earliest to latest in the time domain. For example, if the value of K is 3, the first time-frequency resource may occupy time slot n, the second time-frequency resource may occupy time slot n+1, and the third time-frequency resource may occupy time slot n+3.

[0183] Of course, in the embodiment of the present application, the K time-frequency resources can be continuous or discontinuous in the time domain. Assuming that the value of K is 3, if the first time-frequency resource occupies time slot n, the second time-frequency resource can occupy time slot n+1, and the third time-frequency resource can occupy time slot n+2, this situation is continuous in the time domain. For another example, if the first time-frequency resource can occupy time slot n, the second time-frequency resource can occupy time slot n+2, and the third time-frequency resource can occupy time slot n+5, this situation is discontinuous in the time domain.

[0184] For example, among the K time-frequency resources, each time-frequency resource may occupy at least one symbol, at least one time slot, or at least one subframe in the time domain, etc. The embodiment of the present application does not impose any limitation on the time domain length of each time-frequency resource.

[0185] In an embodiment of the present application, a symbol is also called a time domain symbol, which may be an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier frequency division multiple access (SC-FDMA) symbol, where SC-FDMA is also called orthogonal frequency division multiplexing with transform precoding (OFDM with TP).

[0186] Optionally, among the K time-frequency resources, different time-frequency resources may or may not overlap in the frequency domain.

[0187] Optionally, the frequency domain resources in the K time-frequency resources may include: an authorized frequency band, an unlicensed frequency band, or a dedicated frequency band, etc. This embodiment of the present application does not limit this.

[0188] Optionally, S1110 may be expressed as: the first terminal device sends a reference signal to the second terminal device on each of the K time-frequency resources, where different time-frequency resources in the K time-frequency resources correspond to different beam directions. Alternatively, the first terminal device sends a reference signal to the second terminal device on each of the K time-frequency resources using different beams.

[0189] S1120, the second terminal device measures the reference signal on K time-frequency resources respectively, obtains the measurement results of the K reference signals, and determines whether the measurement results of the K reference signals meet the conditions, or determines the comparison results of the measurement results of the K reference signals with the threshold.

[0190] For example, the second terminal device can detect the reference signal on K time-frequency resources respectively, and obtain the measurement results of the reference signal on each time-frequency resource. Since each time-frequency resource corresponds to a different beam, or each reference signal corresponds to a different beam, the measurement results of K reference signals can also be called the measurement results of K beams.

[0191] Exemplarily, in an embodiment of the present application, the reference signal sent by the first terminal device to the second terminal device in K time-frequency resources may include: CSI-RS, SSB, sidelink secondary synchronization signal (S-SSS), sidelink primary synchronization signal (S-SSS), or at least one of DMRS. Of course, in other implementations of the present application, the reference signal may also include other reference signals, as long as the reference signal can be used for beam measurement, and the embodiment of the present application does not limit this.

[0192] Exemplarily, the reference signal measurement result may include at least one of an RSRP value of the reference signal, an RSRQ value of the reference signal, an SNR value of the reference signal, or an SINR value of the reference signal. Of course, in other implementations of the present application, the reference signal measurement result may also include other measurement values, which are not limited in the embodiments of the present application.

[0193] It should also be understood that the above-mentioned reference signals all refer to reference signals sent by the first terminal device to the second terminal device, that is, reference signals on the side link, and these reference signals can all be used for beam measurement on the side link.

[0194] As a possible implementation method, in S1120, after the second terminal device obtains the measurement results of K reference signals, it further determines whether the measurement results of the K reference signals (i.e., the measurement results of K beams) meet the conditions, and generates indication information (i.e., first indication information) based on whether the measurement results of the K reference signals meet the conditions. The first indication information is used to indicate whether the measurement results of the K reference signals meet the conditions.

[0195] As another possible implementation method, in S1120, after the second terminal device obtains the measurement results of K reference signals, it further determines the comparison results of the measurement results of the K reference signals with the threshold (the comparison results, for example, include differences, etc.), and generates indication information (i.e., second indication information) based on the comparison results. The second indication information is used to indicate: the comparison results of the measurement results of the K reference signals with the threshold.

[0196] Optionally, as a possible implementation manner, the second terminal device can obtain indication information corresponding to each reference signal measurement result. That is, each reference signal (each beam) corresponds to an indication information (first indication information or second indication information), and the first indication information is used to indicate whether the measurement result of a reference signal (or a beam) meets the condition, or the second indication information is used to indicate the comparison result of the measurement result of a reference signal (or a beam) with a threshold.

[0197] Optionally, as another possible implementation, after obtaining the measurement results of the K reference signals, the second terminal device may determine whether the measurement results of the K reference signals meet a condition, and obtain indication information corresponding to the K reference signal measurement results. In this case, the measurement results of the K reference signals (the measurement results of the K beams) correspond to one indication information (first indication information), and the first indication information is used to indicate whether the measurement results of the K reference signals (the measurement results of the K beams) meet the condition.

[0198] S1130, the second terminal device sends feedback information to the first terminal device in the first time-frequency resource, and the feedback information includes: first indication information for indicating whether the measurement results of the K reference signals meet the conditions, or at least one of second indication information for indicating the comparison results of the measurement results of the K reference signals with the threshold.

[0199] Correspondingly, the first terminal device receives feedback information from the second terminal device on the first time-frequency resource.

[0200] Optionally, as a possible implementation method, in S1130, the second terminal device can feed back first indication information for indicating whether the measurement results of K reference signals meet the conditions to the first terminal device on the first time-frequency resource. In other words, the second terminal device feeds back the feedback information (or it can also be called a beam report) on whether the measurement results of K beams meet the conditions to the first terminal device in the same time unit, that is, the feedback information on whether the measurement results of multiple beams meet the conditions is aggregated in one time unit (time domain resource) for feedback. The feedback information of each beam does not directly indicate the measurement result of the beam, but indicates whether the measurement result of the beam meets the conditions. The length of the information used to indicate whether the measurement result meets the conditions is less than the length of the information used to indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back, reduce the length of the feedback information and the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

[0201] Optionally, as another possible implementation method, in S1130, the second terminal device can feed back second indication information for indicating the comparison result of the measurement result of K reference signals with the threshold (the comparison result includes, for example, a difference, etc.) to the first terminal device on the first time-frequency resource. In other words, the second terminal device feeds back the comparison result of the K beam measurement results with the threshold to the first terminal device in the same time unit, that is, the comparison result of the measurement result of each beam in the multiple beams with the threshold is aggregated in one time unit (time domain resource) for feedback. The feedback information of each beam does not directly indicate the measurement result of the beam, but indicates the comparison result of the measurement result of the beam with the threshold. The length of the information used to indicate the comparison result is less than the length of the information used to indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back, reduce the length of the feedback information and the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

[0202] It can be understood that the first time-frequency resource in S1130 is different from the K time-frequency resources. Moreover, the time domain position of the first time-frequency resource is after the time domain positions corresponding to the K time-frequency resources.

[0203] Illustratively, the first time-frequency resource may occupy at least one symbol, at least one time slot, or at least one subframe in the time domain, etc. The embodiment of the present application does not impose any limitation on the time domain length of the first time-frequency resource.

[0204] For example, Figure 12 shows a schematic diagram of K time-frequency resources and a first time-frequency resource. In the example shown in Figure 12, the value of K is 4, and the time domain positions corresponding to the four time-frequency resources are: time slot 1 (slot 1), time slot 3, time slot 5, and time slot 7. The first terminal device sends reference signals on these four time-frequency resources respectively. Among them, reference signal 1 on time slot 1 corresponds to beam 1 (reference signal 1 on time slot 1 is sent using beam 1), reference signal 2 on time slot 3 corresponds to beam 2 (reference signal 2 on time slot 3 is sent using beam 2), reference signal 3 on time slot 5 corresponds to beam 3 (reference signal 3 on time slot 5 is sent using beam 3), and reference signal 4 on time slot 7 corresponds to beam 4 (reference signal 4 on time slot 7 is sent using beam 4). The time domain position of the first time-frequency resource is time slot 9. In other words, the beam feedback information on time slot 1, time slot 3, time slot 5, and time slot 7 is all fed back on time slot 9.

[0205] The second terminal device detects the reference signals in time slots 1, 3, 5, and 7, respectively, obtains measurement results of the reference signals, and then sends first indication information indicating whether the measurement results of the four reference signals meet a condition, or second indication information indicating the comparison result of the measurement results of the four reference signals with a threshold, to the first terminal device in time slot 9. In other words, the second terminal device feeds back the feedback information (or beam report) of the four beams to the first terminal device in time slot 9. That is, the feedback information of multiple beams is aggregated into a single time unit (time slot 9) for feedback.

[0206] Optionally, in the example shown in FIG12 , in time slot 9, the first indication information or second indication information corresponding to the reference signals on time slot 1, time slot 3, time slot 5, and time slot 7, respectively, may be positioned from earliest to latest in the time domain as follows: the first indication information or second indication information corresponding to the reference signal on time slot 1, the first indication information or second indication information corresponding to the reference signal on time slot 3, the first indication information or second indication information corresponding to the reference signal on time slot 5, and the first indication information or second indication information corresponding to the reference signal on time slot 7. That is, in the feedback information sent by the second terminal device to the first terminal device, the first indication information or second indication information corresponding to each reference signal may be arranged according to the order of the reference signals (the order of the beams).

[0207] Optionally, S1130 can also be expressed as: the second terminal device sends indication information to the first terminal device on the first time-frequency resource, where the indication information is used to indicate the measurement results corresponding to the K reference signals. Correspondingly, the first terminal device receives indication information from the second terminal device on the first time-frequency resource, where the indication information is used to indicate the measurement results corresponding to the K reference signals.

[0208] Exemplarily, the indication information may include: at least one of the first indication information or the second indication information mentioned above.

[0209] Optionally, in some possible implementations, K reference signals may be sent multiple times in succession. The multiple transmission of K reference signals may be understood as: the first terminal device sending K reference signals is regarded as one time or a group of transmissions. The first terminal device may send multiple times or multiple groups continuously. For example, the first terminal device may send N times in succession, each time sending K reference signals, where N is an integer greater than or equal to 1. Then the first terminal device sends a total of N×K reference signals. The "continuous" here may be understood as: treating the K reference signals as a whole or a group, after the first terminal device sends a group of reference signals (including K reference signals), after a period of time, the first terminal device sends another group of reference signals (also including K reference signals), then these two times are two consecutive transmissions of reference signals. Of course, the time interval between any two transmissions (that is, the time interval between the time of the last reference signal sent in the previous time and the time interval between the first reference signal sent in the next time) may be the same or different. The same situation is the situation of periodically sending K reference signals. For any two reference signals sent, the number of reference signals is the same, and the beams used by the corresponding reference signals are also the same. Optionally, during the transmission of two groups (or two times) of K reference signals by the first terminal device, the order of the K reference signals (i.e., the order of the K beams) may be the same or different. It is understandable that there is a correspondence between the beam and the resource identifier or the reference signal identifier, and the beams between the two groups can be associated or corresponded through the correspondence. In this case, the second terminal device needs to detect N times and obtain the measurement results of K reference signals each time. That is, the second terminal device needs to detect the measurement results of N×K reference signals.

[0210] For example, FIG13 shows an example of a periodic transmission of K reference signals. As shown in FIG13 a, the interval between two adjacent transmissions is ΔT. Four reference signals are transmitted each time, namely reference signal 1 to reference signal 4. Reference signal 1 corresponds to beam 1 (reference signal 1 is transmitted using beam 1), reference signal 2 corresponds to beam 2 (reference signal 2 is transmitted using beam 2), reference signal 3 corresponds to beam 3 (reference signal 3 is transmitted using beam 3), and reference signal 4 corresponds to beam 4 (reference signal 1 is transmitted using beam 4). The reference signals transmitted for the second time also include reference signals 1 to reference signal 4. Reference signal 1 corresponds to beam 1 (reference signal 1 is transmitted using beam 1), reference signal 2 corresponds to beam 2 (reference signal 2 is transmitted using beam 2), reference signal 3 corresponds to beam 3 (reference signal 3 is transmitted using beam 3), and reference signal 4 corresponds to beam 4 (reference signal 1 is transmitted using beam 4). Reference signals 1 to reference signals 4 are also transmitted each subsequent time. Figure 13(a) shows the case where the order of the K reference signals (i.e., the order of the K beams) is the same during the two sets (two transmissions). Figure 13(b) shows the case where the order of the K reference signals (i.e., the order of the K beams) is different during the two sets (two transmissions).

[0211] In the example shown in FIG13 , assuming that the first terminal device sends 4 reference signals 3 times in a row each time, the second terminal device needs to detect the measurement results of 12 reference signals, that is, it needs to detect the measurement results of 12 beams.

[0212] When the first terminal device sends K reference signals multiple times (for example, N times) in succession, in S1120, the second terminal device can respectively detect the measurement results of the reference signals sent each time, and each time it is necessary to detect the measurement results of K reference signals (i.e., K beams).

[0213] As a possible implementation method, when the first terminal device sends K reference signals multiple times (for example, N times) in a row, if the measurement results of the N×K reference signals are all greater than or equal to the first threshold (i.e., the condition is met), that is, the measurement results of the K reference signals in each of the N consecutive measurements are greater than or equal to the first threshold. For example, if the RSRP of the N×K reference signals is greater than or equal to the first threshold, the second terminal device can generate a first indication information, and the first indication information is used to indicate that the measurement results of the N×K reference signals are greater than or equal to the first threshold (i.e., used to indicate that the condition is met), or used to indicate that the measurement results of the K reference signals in each of the N consecutive measurements are greater than or equal to the first threshold (i.e., used to indicate that the condition is met). In other words, a first indication information can indicate that the measurement results of the N×K reference signals (the measurement results of the N×K beams) meet the condition. In this case, the length of the first indication information can be 1 bit, that is, in S1130, the feedback information includes only one first indication information, the length of the first indication information in the feedback information is 1 bit, and the value is a first value (for example, 0 or 1; or the indicated state is ACK or NACK), which is used to indicate that each measurement result in N consecutive measurements is greater than or equal to the first threshold (that is, used to indicate that the condition is met). Each measurement result includes the measurement results of K reference signals. In this way, the amount of data that needs to be fed back can be further reduced, the communication resources required for the first indication information are less (the feedback information or the first indication information only requires 1 bit), and the consumption of communication resources is further reduced.

[0214] Optionally, as another possible implementation method, when the first terminal device sends K reference signals multiple times (for example, N times) in a row, if the measurement results of the N×K reference signals are all less than or equal to the first threshold (that is, the condition is not met), the length of the first indication information may also be 1 bit, that is, in S1130, the feedback information includes only one first indication information, the length of the first indication information in the feedback information is 1 bit, and the value is the second value (for example, 1 or 0; or the indicated state is NACK or ACK) used to indicate that each measurement result in N consecutive measurements is less than or equal to the threshold (that is, used to indicate that the condition is not met), or used to indicate: each measurement result of the K reference signals in N consecutive measurements is less than or equal to the first threshold (that is, used to indicate that the condition is not met). In this way, the amount of data that needs to be fed back can be further reduced, the communication resources required for the first indication information are less (the feedback information or the first indication information only requires 1 bit), and the consumption of communication resources is further reduced.

[0215] It should be understood that the first value and the second value mentioned above are different, or the first value and the second value mentioned above are not equal.

[0216] In other words, when the first terminal device sends K reference signals multiple times (for example, N times) in a row, the first indication information can be used to indicate that the measurement results of the N×K reference signals are all greater than or equal to the first threshold (i.e., used to indicate that the condition is met), or used to indicate that the measurement results of the N×K reference signals are all less than or equal to the first threshold (i.e., used to indicate that the condition is not met). The feedback information in S1130 includes a first indication information. The length of a first indication information can be 1 bit, or it can be greater than 1 bit, for example, 2 bits or 3 bits. The embodiment of the present application does not limit the length of the first indication information.

[0217] Of course, as another possible implementation method, when the first terminal device sends K reference signals multiple times (for example, N times), if the measurement results of the N×K reference signals are all less than or equal to the first threshold (that is, the condition is not met), the second terminal device may not send the first indication information or feedback information to the first terminal device on the first time-frequency resource. If the measurement results of the N×K reference signals are all greater than or equal to the first threshold (that is, the condition is met), the second terminal device sends the first indication information or feedback information to the first terminal device on the first time-frequency resource. In this case, the length of the first indication information can be 1 bit, that is, in S1130, the feedback information includes only one first indication information. In other words, if the first terminal device does not receive the feedback information or the first indication information sent by the second terminal device on the first time-frequency resource, the first terminal device can determine that when the first terminal device sends K reference signals multiple times (for example, N times), the measurement results of the N×K reference signals are all less than or equal to the threshold, that is, the condition is not met. If the first terminal device receives feedback information or first indication information sent by the second terminal device on the first time-frequency resource, it can be determined that when the first terminal device sends K reference signals multiple times (for example, N times) in a row, the measurement results of N×K reference signals are all greater than or equal to the threshold, that is, the first indication information is used to indicate that the condition is met.

[0218] Of course, as another possible implementation method, when the first terminal device sends K reference signals multiple times (for example, N times), if the measurement results of the N×K reference signals are all less than or equal to the first threshold (that is, the condition is not met), the second terminal device may also send the first indication information or feedback information to the first terminal device on the first time-frequency resource. In this case, the length of the first indication information can be 1 bit, that is, in S1130, the feedback information only includes one first indication information. If the measurement results of the N×K reference signals are all greater than or equal to the first threshold (that is, the condition is met), the second terminal device does not send the first indication information or feedback information to the first terminal device on the first time-frequency resource. In other words, if the first terminal device does not receive the feedback information or the first indication information sent by the second terminal device on the first time-frequency resource, the first terminal device can determine that when the first terminal device sends K reference signals multiple times (for example, N times), the measurement results of the N×K reference signals are all greater than or equal to the first threshold, that is, the condition is met. If the first terminal device receives feedback information or first indication information sent by the second terminal device on the first time-frequency resource, it can be determined that when the first terminal device sends K reference signals multiple times (for example, N times) in a row, the measurement results of N×K reference signals are all less than or equal to the first threshold, that is, the first indication information is used to indicate that the condition is not met.

[0219] Of course, when the first terminal device sends K reference signals multiple times (for example, N times) in a row, the length of the first indication information may also be greater than 1 bit, such as 2 bits or 3 bits, etc. The first indication information is used to indicate that the measurement results of N×K reference signals are all less than or equal to the first threshold (i.e., the condition is met), or to indicate that the measurement results of N×K reference signals are all greater than or equal to the first threshold (i.e., the condition is not met). The feedback information in S1130 includes only one first indication information, and the length of the feedback information may be the same as the length of one first indication information. The embodiment of the present application does not limit the length of the first indication information.

[0220] Optionally, in some possible implementations, when the first terminal device sends K reference signals multiple times (for example, N times) in succession, in the N measurements, if the measurement results of the i-th reference signal in the K reference signals are all greater than or equal to a threshold value (for example, a first threshold value), then the first indication information corresponding to the i-th reference signal can be used to indicate that: the measurement results of the i-th reference signal in m consecutive measurements are all greater than or equal to the threshold value (that is, the first indication information is used to indicate that the condition is met). The value of i is 1, 2…, K, and the value of m is an integer less than or equal to N. For each reference signal (or each beam), for one first indication information, the length of one first indication information can be 1 bit, and the value is the first value (for example, 0 or 1; or the indicated status is ACK), which is used to indicate that the measurement results of this reference signal in m consecutive measurements are all greater than or equal to the threshold value (that is, used to indicate that the condition is met). Then in S1130, the feedback information includes several first indication information. One first indication information needs to carry the reference signal identifier or beam identifier corresponding to the indication information. The number of first indication information included in the feedback information may be less than or equal to K.

[0221] Alternatively, if the measurement results of the i-th reference signal in K reference signals are all less than or equal to a threshold value (for example, a first threshold value) in m consecutive measurements, the first indication information corresponding to the i-th reference signal can be used to indicate: the measurement results of the i-th reference signal in m consecutive measurements are all less than or equal to the threshold value (that is, used to indicate that the condition is not met). For each reference signal (each beam), for one first indication information, the length of one first indication information can be 1 bit, and the value is a first value (for example, 1 or 0; or the indicated state is NACK), which is used to indicate that the measurement results of this reference signal in m consecutive measurements are all less than or equal to the threshold value (that is, used to indicate that the condition is not met). Then in S1130, the feedback information includes several first indication information. One first indication information needs to carry the reference signal identifier or beam identifier corresponding to the indication information, and the number of first indication information included in the feedback information can be less than or equal to K.

[0222] In other words, when the first terminal device sends K reference signals multiple times (for example, N times) in a row, the first indication information corresponding to the i-th reference signal can be used to indicate that the measurement results of the i-th reference signal in m consecutive measurements are all less than or equal to the threshold (that is, the condition is not met), or used to indicate that the measurement results of the i-th reference signal in m consecutive measurements are all greater than or equal to the threshold (that is, the condition is met). The feedback information in S1130 includes several first indication information. The length of a first indication information can be 1 bit, or it can be greater than 1 bit, for example, 2 bits or 3 bits. The embodiment of the present application does not limit the length of the first indication information. A first indication information needs to carry the reference signal identifier or beam identifier corresponding to the indication information. The number of first indication information included in the feedback information can be less than or equal to K.

[0223] Optionally, the above threshold (eg, the first threshold) may be predefined, or may be indicated by the first terminal device to the second terminal device via signaling, or the first threshold may be preconfigured (or configured). This embodiment of the present application does not limit this.

[0224] It should be understood that in the embodiments of this application, "predefined" content or thresholds can be understood as information that is defined by a standard and does not require additional device configuration. It is information that is pre-recorded / written in the hardware and / or software of the terminal device itself, or it can be understood as information that cannot be changed by the network device or other terminal devices. "Pre-configured" content or thresholds can be understood as information that is pre-recorded / written in the hardware and / or software of the terminal device itself, determined by the device manufacturer, and can be changed through software or hardware.

[0225] Exemplarily, (pre) configuration can be divided into network device (pre) configuration and terminal device (pre) configuration. If it is network device (pre) configuration, it can be (pre) configured through system information block (SIB) or RRC signaling; if it is terminal device (pre) configuration, it can be (pre) configured through PC5-RRC signaling.

[0226] Optionally, in some possible implementations of the present application, after the first terminal device detects the measurement result of a reference signal (assuming it is the i-th reference signal), it may also compare the measurement result of the i-th reference signal with a threshold to determine whether the measurement result of the i-th reference signal meets a condition. The first indication information corresponding to the measurement result of the i-th reference signal can be used to indicate that the measurement result of the i-th reference signal meets the condition; or to indicate that the measurement result of the i-th reference signal does not meet the condition. In this case, each reference signal (or each beam) corresponds to a first indication information, and the first indication information is used to indicate whether the measurement result of a reference signal (or a beam) meets or does not meet the condition. The value of i is 1, 2..., K. The feedback information in S1130 may include K first indication information. Optionally, the length of one first indication information may be 1 bit. In this case, the feedback information in S1130 includes K first indication information, and the length of the feedback information may be K bits. This can further reduce the amount of data required for feedback, and the first indication information requires fewer communication resources (the feedback information only requires K bits), further reducing the consumption of communication resources.

[0227] Exemplarily, the condition satisfied by the measurement result of the i-th reference signal may include:

[0228] At least one of the following: a comparison result of the measurement result of the i-th reference signal and the second threshold is within a threshold range, a comparison result of the measurement result of the i-th reference signal and the second threshold is greater than or equal to a third threshold, or a measurement result of the i-th reference signal is greater than or equal to a fourth threshold.

[0229] Optionally, the above-mentioned threshold range, second threshold, third threshold, or fourth threshold may be: a measurement value of a reference signal of the current best beam pair between the first terminal device and the second terminal device (for example, RSRP, SINR, BLER, etc.). In the embodiment of the present application, there is no restriction on the value of the threshold range, the second threshold, the third threshold, or the fourth threshold.

[0230] Optionally, at least one of the above-mentioned threshold range, second threshold, third threshold or fourth threshold may also be predefined, preconfigured, or indicated or configured by the network device to the first terminal device and the second terminal device through DCI, RRC signaling, SIB information or MIB information, or indicated or configured by the first terminal device to the second terminal device through side link control information (SCI) or PC5 RRC signaling, or indicated or configured by the second terminal device to the first terminal device through SCI or PC5 RRC signaling.

[0231] Exemplarily, the measurement result of the i-th reference signal not satisfying the condition may include:

[0232] The comparison result between the measurement result of the i-th reference signal and the second threshold is less than or equal to the third threshold, or the measurement result of the i-th reference signal is less than or equal to at least one of the fourth thresholds.

[0233] Optionally, the comparison result between the measurement result of the reference signal and the threshold may include a difference value (the value obtained by subtracting the threshold from the measurement result of the reference signal, or the value obtained by subtracting the measurement result of the reference signal from the threshold), etc. In the following examples, the comparison result will be taken as the difference value for illustration.

[0234] Exemplarily, assume that the measurement result corresponding to the i-th reference signal is RSRP i , the second threshold is TH2, the threshold range is (α, β), the value of β is greater than α, α can be a positive number or 0, the third threshold is δ, δ is greater than or equal to zero, and the fourth threshold is TH4. If at least one of the following formulas (1) to formula (3) is satisfied, it is determined that the measurement result of the i-th reference signal satisfies the condition:

[0235] α ≤ |RSRP i - TH2| ≤ β or α ≤ |RSRP i - TH2 n ≤ β, 0 < n, (1), for example, n = 1 / 2, 2.

[0236] RSRP i - TH2 ≥ δ or |RSRP i - TH2| n ≥ δ 0 < n, (2), for example, n = 1 / 2, 2.

[0237] RSRP i ≥ TH4 (3)

[0238] If the following formula (4) or formula (5) is satisfied, it is determined that the measurement result of the i-th reference signal does not satisfy the condition:

[0239] RSRP i - TH2 ≤ δ or |RSRP i - TH2| n ≤ δ 0 < n, (4), for example, n = 1 / 2, 2.

[0240] RSRP i ≤ TH4 (5)

[0241] It should be understood that in the embodiment of the present application, the situations in which the measurement result of a certain reference signal meets the conditions and the situations in which the conditions are not met may be predefined by the protocol, preconfigured, or indicated or configured to the first terminal device and the second terminal device by the network device through DCI, RRC signaling, SIB information or MIB information, or indicated or configured to the second terminal device by the first terminal device through SCI or PC5 RRC signaling, or indicated or configured to the first terminal device by the second terminal device through SCI or PC5 RRC signaling. In other words, the first terminal device and the second terminal device have the same understanding of whether the measurement result of a certain reference signal meets the conditions. The embodiment of the present application is not limited here.

[0242] Optionally, as a possible implementation, if the measurement result of the i-th reference signal meets the condition, the first indication information corresponding to the i-th reference signal may indicate ACK. If the measurement result of the i-th reference signal does not meet the condition, the first indication information corresponding to the i-th reference signal may indicate NACK.

[0243] For example, in combination with the example shown in Figure 12, assuming that: the measurement result of reference signal 1 meets the conditions, the measurement result of reference signal 2 meets the conditions, the measurement result of reference signal 3 does not meet the conditions, and the measurement result of reference signal 4 meets the conditions, then in time slot 9, the content included in the feedback information sent by the second terminal device to the first terminal device can be as shown in Figure 14, and the first indication information corresponding to reference signal 1 (beam 1), reference signal 2 (beam 2) and reference signal 4 (beam 4) respectively can indicate ACK, and the first indication information corresponding to reference signal 3 (beam 3) can indicate NACK.

[0244] Of course, when each reference signal (each beam) corresponds to a piece of first indication information, and the piece of first indication information is used to indicate whether the measurement result of the reference signal (or a beam) meets or does not meet a condition, the length of the piece of first indication information can also be greater than 1 bit, for example, 2 bits or 3 bits, etc., to indicate whether the measurement result of the reference signal (or a beam) meets or does not meet the condition. This embodiment of the application does not impose any limitation on the length of the first indication information.

[0245] Optionally, in some possible implementations of the present application, after the first terminal device detects the measurement result of a reference signal (assuming it is the i-th reference signal), it can also compare the measurement result of the i-th reference signal with the threshold to obtain a comparison result, and then send the comparison result to the first terminal device through the second indication information. Exemplarily, the comparison result may include: the difference, difference range or difference interval between the measurement result of the i-th reference signal and the threshold (for example, the fifth threshold), that is, the value obtained by subtracting the fifth threshold from the measurement result of the i-th reference signal, or the interval in which the value obtained by subtracting the fifth threshold from the measurement result of the i-th reference signal is located, or the value obtained by subtracting the measurement result of the i-th reference signal from the fifth threshold, or the interval in which the value obtained by subtracting the measurement result of the i-th reference signal from the fifth threshold is located. In this case, the second indication information corresponding to the measurement result of the i-th reference signal can be used to indicate: the comparison result of the measurement result of the i-th reference signal and the fifth threshold (explained using the difference as an example). In this case, the feedback information in S1130 includes K second indication information. Each piece of second indication information is used to indicate a comparison result between a measurement result of a reference signal and a fifth threshold.

[0246] Optionally, the fifth threshold may be: a measurement value of a reference signal corresponding to the current best beam pair between the first terminal device and the second terminal device (eg, RSRP, SINR, BLER, etc.) In the embodiment of the present application, there is no limitation on the value of the fifth threshold.

[0247] Optionally, the fifth threshold may also be predefined, preconfigured, or indicated or configured by the network device to the first terminal device and the second terminal device through DCI, RRC signaling, SIB information or MIB information, or indicated or configured by the first terminal device to the second terminal device through SCI or PC5 RRC signaling, or indicated or configured by the second terminal device to the first terminal device through SCI or PC5 RRC signaling.

[0248] Optionally, the length of a second indication information may be X bits. In this case, in S1130, the feedback information includes K second indication information, and the length of the feedback information may be K×X bits. In this way, the amount of data that needs to be fed back can be further reduced, and the second indication information requires fewer communication resources. The feedback information only requires K×X bits, which reduces the length of the feedback information and further reduces the consumption of communication resources.

[0249] For example, the length of a second indication information may be 4 bits, and the 4-bit indication information may be used to quantify the difference between a measurement result of a reference signal and the fifth threshold.

[0250] For example, if the length of a second indication information is 4 bits, then these 4 bits can have 16 different states or values. Assume that the measurement result of the i-th reference signal is RSRP i , the fifth threshold is RSRP t In the 4-bit indication information, the difference or step size of the result indicated by the two adjacent bit states (converted to decimal, it is two adjacent values) is 1dB. For example, the value of the 4-bit second indication information is "0000", which means RSRP i -RSRP t =-8dB, "0001" indicates RSRP i -RSRP t =-7dB, "0010" indicates RSRP i -RSRP t =-6dB, "0011" indicates RSRP i -RSRP t =-5dB, "0100" indicates RSRP i -RSRP t =-4dB, and so on. "0011" means RSRP i -RSRP t =0dB; "0101" indicates RSRP i -RSRP t <=1dB; "0110" means RSRPi - RSRPt = 2dB. This difference is quantified using 4 bits. In other words, the different bit states of the 4-bit second indication information can be used to represent (or indicate) a threshold set {-8dB, -7dB, ..., 7dB, 8dB}. Furthermore, the step size between two adjacent differences can be (pre)configured or predefined, for example, the difference between the two differences is 1dB.

[0251] For example, with reference to the example shown in FIG12 , assuming that the difference between the fifth threshold value of the measurement result of reference signal 1 is Δ1, the difference between the fifth threshold value of the measurement result of reference signal 2 is Δ2, the difference between the fifth threshold value of the measurement result of reference signal 3 is Δ3, and the difference between the fifth threshold value of the measurement result of reference signal 4 is Δ4. Then, in time slot 9, the feedback information sent by the second terminal device to the first terminal device may include content as shown in FIG15 . The second indication information corresponding to reference signals 1 (beam 1) to 4 (beam 4), respectively, may indicate the difference between the fifth threshold values ​​of the reference signal measurement results.

[0252] Of course, the comparison result between the measurement result of the i-th reference signal and the fifth threshold value may include other situations in addition to the difference, such as the difference range or difference interval between the measurement result of a reference signal and the fifth threshold value for quantification. Exemplarily, the comparison result between the measurement result of the i-th reference signal and the fifth threshold value may include: the difference between the measurement result of the i-th reference signal and the fifth threshold value is within a certain range. In this case, the second indication information corresponding to the measurement result of the i-th reference signal may be used to indicate: the difference between the measurement result of the i-th reference signal and the fifth threshold value is within a certain range. For example, if the length of a second indication information is 4 bits, assuming that: the measurement result of the i-th reference signal is RSRP i , the fifth threshold is RSRP t , the i-th reference signal corresponds to a 4-bit indication information (for example, "0000"). In the 4-bit indication information, the difference or step size between the results indicated by two adjacent bit states (converted to decimal, that is, two adjacent values) is 1dB. For example, the value of the 4-bit second indication information is "0000", which means RSRP i -RSRP t <=-8dB, "0001" means -8dB <RSRP i -RSRP t <=-7dB, "0010" means -7dB <RSRP i -RSRP t <=-6dB, "0011" means -6dB <RSRP i -RSRP t <=-5dB, "0100" means -5dB <RSRP i -RSRP t <=-4dB, and so on, "0101" means 0dB <RSRP i -RSRP t <=1dB; "0110" means 1dB <RSRP i -RSRP t <=2dB. That is, 4 bits are used to quantize the interval corresponding to the difference. Further optionally, the step size between two adjacent difference intervals can be (pre)configured or predefined, for example, the difference between the two difference intervals is 1dB.

[0253] Optionally, in some possible implementations of the present application, the beam maintenance between the first terminal device and the second terminal device may also be carried out in a scenario based on carrier aggregation, that is, the first terminal device may send reference signals to the second terminal device on multiple carriers. In this case, on each carrier, each reference signal may correspond to a first indication information or a second indication information, and the feedback information needs to include the first indication information or the second indication information corresponding to the reference signals on multiple carriers. The arrangement order of these multiple first indication information or multiple second indication information in the feedback information may be: first in increasing order of carrier and then in increasing order of time domain (for example, time slot), or first in increasing order of time domain (for example, time slot) and then in increasing order of carrier. The embodiments of the present application are not limited here.

[0254] It should be understood that since the beam pair information that needs to be reported or maintained is known to both parties (i.e., the first terminal device and the second terminal device), the first terminal device and the second terminal device know how many beam pairs (i.e., how many reference signals) feedback information needs to be reported, so the amount required for feedback (the number of reference signals) is also known to each other.

[0255] It should also be understood that the first terminal device and the second terminal device need to agree on a time slot position for common feedback, that is, the time domain position of the first time-frequency resource used to send feedback information is known to the first terminal device and the second terminal device.

[0256] In some possible implementations, the time domain position of the first time-frequency resource can be determined by the time domain resource where the i-th reference signal among the K reference signals is located and a first value, where the first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, where the value of i is 1, 2…, K.

[0257] For example, with reference to the example shown in FIG12 , the value of K is 4. The time domain resource where the first reference signal (reference signal 1) is located is time slot 1. Then, for the first reference signal, the first value can be 8, and the time domain location of the first time-frequency resource is time slot 9. The time domain resource where the second reference signal (reference signal 2) is located is time slot 3. Then, for the second reference signal, the first value can be 6, and the time domain location of the first time-frequency resource is time slot 9. The time domain resource where the third reference signal (reference signal 3) is located is time slot 5. Then, for the third reference signal, the first value can be 4, and the time domain location of the first time-frequency resource is time slot 9. The time domain resource where the fourth reference signal (reference signal 4) is located is time slot 7. Then, for the fourth reference signal, the first value can be 2, and the time domain location of the first time-frequency resource is time slot 9. In the example shown in FIG12 , the first value set corresponding to the four reference signals is {2, 4, 6, 8}. If the second terminal device determines that it needs to send feedback information to the first terminal device in time slot 9, then based on the first value set, the second terminal device can determine: the feedback information sent to the first terminal device in time slot 9 includes: the first indication information or second indication information corresponding to the reference signal 1 on time slot 1, the first indication information or second indication information corresponding to the reference signal 2 on time slot 3, the first indication information or second indication information corresponding to the reference signal 3 on time slot 5, and the first indication information or second indication information corresponding to the reference signal 4 on time slot 7.

[0258] Optionally, as a possible implementation method, the time domain position of the first time-frequency resource can be indicated to the second terminal device by the first terminal device through signaling. For example, the time domain position of the first time-frequency resource is time slot n, and time slot n can be indicated to the second terminal device by the first terminal device through a physical sidelink control channel (PSCCH). The first value set can be predefined or indicated to the second terminal device by the first terminal device through signaling. After the second terminal device obtains the first value set and the time domain position of the first time-frequency resource, assuming that: the first value set is {m1, m2, m3, m4}, and the time domain position of the first time-frequency resource is time slot n, the second terminal device can determine that: on time slot n, it is necessary to feedback: the first indication information or the second indication information of the reference signal (beam) on time slot n-m1, the first indication information or the second indication information of the reference signal (beam) on time slot n-m2, the first indication information or the second indication information of the reference signal (beam) on time slot n-m3, and the first indication information or the second indication information of the reference signal (beam) on time slot n-m4. Similar to the semi-static codebook determination process. Through the above method, the second terminal device can accurately determine the time domain position of the first time-frequency resource, thereby improving the accuracy and efficiency of feedback information transmission. The first terminal device and the second terminal device have a consistent understanding of the time domain position of the first time-frequency resource and which reference information is fed back on the first time-frequency resource, thereby ensuring the success rate and effectiveness of feedback information transmission.

[0259] Optionally, as another possible implementation method, when the first terminal device sends a reference signal to the second terminal device on the i-th time-frequency resource, the first value corresponding to the reference signal (beam) can be sent to the second terminal device. The second terminal device can determine the need to send feedback information to the first terminal device on the n+m-th time slot based on the time domain position of the i-th time-frequency resource and the first value, assuming that the first value is m and the time domain position of the i-th time-frequency resource is time slot n. The feedback information includes: a first indication information for indicating whether the measurement result of the i-th reference signal meets the conditions, or at least one of the second indication information for indicating the comparison result of the measurement result of the i-th reference signal with the threshold. For any reference signal, the second terminal device can determine in this way on which time slot to send the feedback information of the reference signal to the first terminal device. In the above manner, the second terminal device can also accurately determine the time domain position of the first time-frequency resource, thereby improving the accuracy and efficiency of feedback information transmission. The first terminal device and the second terminal device have the same understanding of the time domain position of the first time-frequency resource and which reference information is fed back on the first time-frequency resource, thereby ensuring the success rate and effectiveness of sending the feedback information.

[0260] It should be understood that in this embodiment of the present application, the time-frequency positions of the K time-frequency resources may be indicated by the first terminal device to the second terminal device via signaling. In other words, the second terminal device knows which time-frequency resources to receive the reference signal on. Exemplarily, the signaling may include the SCI.

[0261] Optionally, the K time-frequency resources as a whole may appear periodically, for example, as shown in FIG13 .

[0262] Optionally, the K time-frequency resources may also appear periodically. For example, as shown in FIG16 , the K time-frequency resources are periodic, and the time intervals between two adjacent time-frequency resources in the K time-frequency resources are the same.

[0263] It should also be understood that in an embodiment of the present application, the transmitting beam (third beam) for the second terminal device to send feedback information on the first time-frequency resource and the receiving beam (second beam) for the first terminal device to receive feedback information on the first time-frequency resource can be determined in advance by negotiation between the first terminal device and the second terminal device. In other words, the first terminal device knows what beam is needed to receive feedback information at the corresponding position, and the second terminal device knows what beam is needed to send feedback information at the corresponding position, for example, the second terminal device and the first terminal device use the best beam pair to send and receive feedback information, respectively. Optionally, the second beam and / or the third beam can be predefined, or can be preconfigured (or configured). The embodiment of the present application is not limited here.

[0264] In some possible implementations of the present application, since the beam is greatly affected by obstruction, if the second terminal device receives the maintained beam sequence and number normally, then the above-mentioned feedback information method can greatly reduce the amount of data that needs to be fed back. However, if a beam pair has an abnormal reception anomaly, it may cause the number of reference signals (i.e., the number of beams) corresponding to the feedback information sent by the second terminal device to be inconsistent with the number of reference signals (i.e., the number of beams) sent by the first terminal device, and the first terminal device and the second terminal device have inconsistent understandings of the feedback information, and the feedback information will become invalid.

[0265] Therefore, in response to the above problem, as a possible implementation method, when the first terminal device sends reference signals to the second terminal device on K time-frequency resources respectively, it can send an indication message (also called third indication message) to the second terminal device at the same time as sending each reference signal. The third indication message is used to indicate: according to the order of the K reference signals from early to late in the time domain, the current reference signal is which reference signal, or is used to indicate: the total number of reference signals sent by the first terminal device as of the current reference signal, or is used to indicate the cumulative number of reference signals sent by the first terminal device, or is used to indicate the sequence number, index or arrangement of the reference signal sent by the first terminal device. The first terminal device sends a reference signal and a third indication message to the second terminal device on each time-frequency resource among the K time-frequency resources, and then needs to send K third indication messages, and each third indication message corresponds to a reference signal or a beam. In other words, the third indication message is used to indicate which number of beam maintenance the first terminal device and the second terminal device are currently performing. The third indication message is similar to the function of C-DAI. Through the third indication information, the second terminal device can effectively determine whether a reference signal (or beam) may be missed or there is a problem with the beam, and can quickly adjust the subsequent beam reception. It can also improve the accuracy and efficiency of receiving the reference signal, and can accurately determine the measurement results corresponding to each reference signal, thereby ensuring the accuracy of the feedback information.

[0266] For the second terminal device, the third indication information is used to indicate the cumulative number of reference signals received by the second terminal device, or is used to indicate the sequence number, index, or arrangement of the reference signals received by the second terminal device. When the second terminal device receives K reference signals on K time-frequency resources, it receives one reference signal and one third indication information on each time-frequency resource, and therefore needs to receive K third indication information.

[0267] For example, with reference to the example shown in FIG17 , the value of K is 4, the time domain resource where the first reference signal (reference signal 1) is located is time slot 1, the time domain resource where the second reference signal (reference signal 2) is located is time slot 3, the time domain resource where the third reference signal (reference signal 3) is located is time slot 5, and the time domain resource where the fourth reference signal (reference signal 4) is located is time slot 7. When sending the first reference signal, the first terminal device may send an indication information to the second terminal device, indicating the total number of reference signals sent by the first terminal device as of the current reference signal (the first reference signal). For the first reference signal, the value indicated by the indication information may be 0, indicating that the total number of reference signals sent by the first terminal device as of the current reference signal (the first reference signal) is 1. When sending the second reference signal, the first terminal device may send an indication message to the second terminal device, indicating: as of the current reference signal (the second reference signal), the total number of reference signals sent by the first terminal device is 2. For the second reference signal, the value indicated by the indication message may be 1, indicating: as of the current reference signal (the second reference signal), the total number of reference signals sent by the first terminal device is 2. When sending the third reference signal, the first terminal device may send an indication message to the second terminal device, indicating: as of the current reference signal (the third reference signal), the total number of reference signals sent by the first terminal device is 3. For the third reference signal, the value indicated by the indication message may be 2, indicating: as of the current reference signal (the third reference signal), the total number of reference signals sent by the first terminal device is 3. When sending the fourth reference signal, the first terminal device may send an indication message to the second terminal device, indicating: the total number of reference signals sent by the first terminal device as of the current reference signal (the fourth reference signal). For the fourth reference signal, the value indicated by the indication message may be 3, indicating: as of the current reference signal (the fourth reference signal), the total number of reference signals sent by the first terminal device is 4.

[0268] When the second terminal device receives the reference signal, assuming that the first, third, and fourth reference signals are correctly received, but the second reference signal is not received, the second terminal device can determine that the second reference signal is not received and the value indicated by the indication information corresponding to the second reference signal is 1, based on the value indicated by the indication information corresponding to the first reference signal being 0 and the value indicated by the indication information corresponding to the third reference signal being 2.

[0269] After determining that the second reference signal has not been received, as a possible implementation method, for example, the second terminal device can determine that the measurement result of the second reference signal is 0, for example, the RSRP, RSRQ, SNR, or SINR value of the second reference signal is 0. Therefore, based on the measurement result of the second reference signal, it is determined whether the second reference signal meets the condition, or the comparison result of the measurement result of the second reference signal with the threshold is determined, so that the first indication information for indicating whether the measurement result of the reference signal 2 meets the condition, or the second indication information for indicating the comparison result of the measurement result of the reference signal 2 with the threshold is sent to the first terminal device in time slot 9. In other words, the second terminal device can determine which beams or reference signals are not received based on the indication information, thereby improving the accuracy and efficiency of receiving reference signals. In addition, the accuracy of the feedback information is guaranteed.

[0270] After determining that the second reference signal has not been received, as another possible implementation method, when the second terminal device uses a beam to receive a reference signal, the receiving beam information of the subsequent reference signal can be determined based on the receiving beam information of the previous reference signal. In this case, after determining that the second reference signal (beam) has not been received, the second terminal device can adjust the fourth beam (the beam of the third reference signal) based on the third beam (the beam of the third reference signal), and then use the fourth beam to receive the fourth reference signal, that is, the subsequent beam reception can be quickly adjusted to improve the accuracy and efficiency of receiving reference signals.

[0271] The method for sidelink information transmission provided in this application provides feedback within the same timeframe: comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with a threshold, or feedback on whether the measurement results of multiple reference signals meet a condition, rather than directly feeding back the measurement results of multiple reference signals. Different reference signals correspond to different beam directions. The length of the information used to indicate whether the comparison result or the measurement result meets the condition is shorter than the length of the information used to indicate the measurement result. This effectively reduces the amount of data required for feedback, the length of the feedback information, and the communication resources required for the feedback information, thereby reducing communication resource consumption.

[0272] It should be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples given, those skilled in the art can obviously make various equivalent modifications or changes. For example, some steps in the above method embodiments may not be necessary, or some new steps may be added. Or a combination of any two or any multiple embodiments described above. Such modifications, changes, or combined solutions also fall within the scope of the embodiments of the present application.

[0273] It should also be understood that the division of the modes, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various modes, categories, situations and embodiments can be combined without contradiction.

[0274] It should also be understood that the various numerical numbers involved in the embodiments of this application are only for the convenience of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0275] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0276] The above embodiment of the present application is described in detail with reference to Figures 1 to 17. The following embodiment of the communication device of the present application is described in detail with reference to Figures 18 to 20.

[0277] In this embodiment, terminal devices (including the first terminal device and the second terminal device) can be divided into functional modules according to the above method. For example, each function can be divided into functional modules, or two or more functions can be integrated into a single processing module. The integrated modules can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used.

[0278] It should be noted that the relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0279] The terminal device provided in the embodiment of the present application (including the first terminal device and the second terminal mentioned above) is used to perform any method of information transmission on the side link provided in the above method embodiment, so that the same effect as the above implementation method can be achieved. In the case of adopting an integrated unit, the terminal device may include a processing module, a storage module and a communication module. Among them, the processing module can be used to control and manage the actions of the terminal device. For example, it can be used to support the terminal device to execute the steps performed by the processing unit. The storage module can be used to support the storage of program code and data, etc. The communication module can be used to support communication between the terminal device and other devices.

[0280] The processing module may be a processor or a controller. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, and so on. The storage module may be a memory. The communication module may specifically be a device that interacts with other electronic devices, such as a radio frequency circuit, a Bluetooth chip, or a Wi-Fi chip.

[0281] For example, Figure 18 shows a schematic block diagram of a communication device 1800 according to an embodiment of the present application. The communication device 1800 may correspond to the first terminal device or the second terminal device described in the above method 1100, or may be a chip or component applied to the first terminal device or the second terminal device. In addition, each module or unit in the communication device 1800 is respectively used to perform each action or processing performed by the first terminal device or the second terminal device in the above method 1100.

[0282] As shown in FIG18 , the communication device 1800 includes a processing module 1810 (or also referred to as a processing unit 1810 ) and an interface module 1820 (or also referred to as an interface unit 1820 ). The interface module 1820 is used to perform specific signal transmission and reception under the drive of the processing module 1810 .

[0283] In some embodiments:

[0284] The interface module 1820 is configured to: send K reference signals to the second terminal device on K time-frequency resources, respectively, where different time-frequency resources in the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1;

[0285] The interface module 1820 is also used to: receive feedback information from the second terminal device on the first time-frequency resource, the feedback information including: first indication information for indicating whether the measurement results of the K reference signals meet the conditions, or at least one of second indication information for indicating the comparison results of the measurement results of the K reference signals with the threshold.

[0286] An embodiment of the present application provides a communication device that receives feedback from a second terminal device within the same time period (on a first time-frequency resource) on the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with a threshold, or whether the measurement results of multiple reference signals meet a condition, rather than directly feeding back the measurement results of multiple reference signals, where different reference signals correspond to different beam directions. The length of the information used to indicate whether the comparison result or the measurement result meets the condition is less than the length of the information used to indicate the measurement result, which can effectively reduce the amount of data that needs to be fed back, reduce the length of the feedback information, and reduce the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

[0287] In some possible implementations, different time-frequency resources among the K time-frequency resources correspond to different beam directions.

[0288] Exemplarily, the comparison result between the measurement result of the reference signal and the threshold may include a difference value (a value obtained by subtracting the threshold value from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold value).

[0289] In some possible implementations, satisfying the condition includes: each measurement result of K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of K reference signals in N consecutive measurements is greater than or equal to the first threshold, N is an integer greater than or equal to 1, and each measurement result includes the measurement results of K reference signals. Exemplarily, the feedback information includes only one first indication information, and the length of the first indication information in the feedback information can be 1 bit, which is used to indicate that each measurement result in N consecutive measurements is greater than or equal to the first threshold (i.e., used to indicate that the condition is satisfied). Or it is used to indicate: each measurement result in N consecutive measurements is less than or equal to the first threshold (i.e., used to indicate that the condition is not satisfied). Each measurement result includes the measurement results of K reference signals. The amount of data required for feedback can be further reduced, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0290] In some possible implementations, a measurement result of the i-th reference signal among K reference signals satisfies a condition including: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the i-th reference signal is used to indicate: whether the measurement result of the i-th reference signal satisfies the condition or whether the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

[0291] In some possible implementations, the condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the measurement of the i-th reference signal is used to indicate: whether the measurement result of the i-th reference signal satisfies the condition or whether the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

[0292] In some possible implementations, the second indication information is used to indicate a comparison result of a measurement result of an i-th reference signal among K reference signals with a fifth threshold, where i is 1, 2, ..., K, and the feedback information includes K pieces of second indication information. One piece of second indication information is used to indicate a comparison result of a measurement result of one reference signal with the fifth threshold.

[0293] In some possible implementations, the time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located. The first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K.

[0294] In some possible implementations, the first time-frequency resource corresponds to a second beam (receiving beam), and the second beam is predefined or preconfigured.

[0295] In some possible implementations, the interface module 1820 is also used to: send K reference signals and third indication information to the second terminal device on K time-frequency resources respectively, and the third indication information is used to indicate; the cumulative number of reference signals sent by the communication device 1800, or the third indication information is used to indicate the sequence number, index or arrangement of the reference signal sent by the communication device 1800. In other words, the third indication information is used to indicate the number of beam maintenance currently performed by the communication device 1800 and the second terminal device, and the third indication information is similar to the role of C-DAI. Through the third indication information, the second terminal device can effectively determine whether a certain reference signal (or beam) may be missed or there is a problem with the beam, and the subsequent beam reception can be quickly adjusted, and the accuracy and efficiency of the received reference signal can be improved, and the measurement results corresponding to each reference signal can be accurately determined, thereby ensuring the accuracy of the feedback information. A third indication information can be sent on each time-frequency resource. For example. The communication device 1800 sends the i-th reference signal and the i-th third indication information to the second terminal device on the i-th time-frequency resource, where the i-th third indication information is used to indicate; the cumulative number of reference signals sent by the communication device 1800 is i, or is used to indicate the sequence number, index or arrangement of the reference signals sent by the communication device 1800.

[0296] In some possible implementations, the reference signal includes at least one of: CSI-RS, SSB, S-SSS, S-PSS or DMRS.

[0297] In some possible implementations, the measurement result of the reference signal includes at least one of: RSRP of the reference signal, RSRQ of the reference signal, SNR of the reference signal, or SINR of the reference signal.

[0298] In some possible implementations, the time domain resources of the first time-frequency resource are at least one OFDM symbol, at least one time slot, or at least one subframe, and the time domain resources of the i-th time-frequency resource among the K time-frequency resources are at least one OFDM symbol, at least one time slot, or at least one subframe, where the value of i is 1, 2…, K.

[0299] In other embodiments:

[0300] The interface module 1820 is configured to receive K reference signals from the first terminal device on K time-frequency resources, respectively, where different time-frequency resources in the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1.

[0301] The interface module 1820 is also used to: send feedback information to the first terminal device on the first time-frequency resource, and the feedback information includes: first indication information for indicating whether the measurement results of the communication device measuring K reference signals on K time-frequency resources meet the conditions, or at least one of second indication information for indicating the comparison results of the measurement results of the K reference signals with the threshold.

[0302] An embodiment of the present application provides a communication device that, within the same time unit (on a first time-frequency resource), provides feedback on the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with a threshold, or provides feedback on whether the measurement results of multiple reference signals meet a condition, rather than directly providing feedback on the measurement results of multiple reference signals. Different reference signals correspond to different beam directions. The length of the information used to indicate whether the comparison result or the measurement result meets the condition is shorter than the length of the information used to indicate the measurement result. This effectively reduces the amount of data required for feedback, the length of the feedback information, and the communication resources required for the feedback information, thereby reducing communication resource consumption.

[0303] In some possible implementations, different time-frequency resources among the K time-frequency resources correspond to different beam directions.

[0304] Exemplarily, the comparison result between the measurement result of the reference signal and the threshold may include a difference value (a value obtained by subtracting the threshold value from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold value).

[0305] In some possible implementations, satisfying the condition includes: each measurement result of K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of K reference signals in N consecutive measurements is greater than or equal to the first threshold, N is an integer greater than or equal to 1, and each measurement result includes the measurement results of K reference signals. Exemplarily, the feedback information includes only one first indication information, and the length of the first indication information in the feedback information can be 1 bit, which is used to indicate that each measurement result in N consecutive measurements is greater than or equal to the first threshold (i.e., used to indicate that the condition is satisfied). Or it is used to indicate: each measurement result in N consecutive measurements is less than or equal to the first threshold (i.e., used to indicate that the condition is not satisfied). Each measurement result includes the measurement results of K reference signals. The amount of data required for feedback can be further reduced, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

[0306] In some possible implementations, the condition that a measurement result of the i-th reference signal among the K reference signals satisfies includes: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the measurement of the i-th reference signal is used to indicate: whether the measurement result of the i-th reference signal satisfies the condition or whether the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

[0307] In some possible implementations, the condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where i is 1, 2, ..., K. The feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: whether the measurement result of the i-th reference signal satisfies the condition or whether the measurement result of the i-th reference signal does not satisfy the condition. The length of each first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

[0308] In some possible implementations, the second indication information is used to indicate a comparison result of a measurement result of an i-th reference signal among K reference signals with a fifth threshold, where i is 1, 2, ..., K, and the feedback information includes K pieces of second indication information. One piece of second indication information is used to indicate a comparison result of a measurement result of one reference signal with the fifth threshold.

[0309] In some possible implementations, the time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located. The first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K.

[0310] In some possible implementations, the first time-frequency resource corresponds to a third beam (transmitting beam), and the third beam is predefined or preconfigured.

[0311] In some possible implementations, the interface module 1820 is further used to: receive K reference signals and third indication information from the first terminal device on K time-frequency resources, respectively, where the third indication information is used to indicate; the cumulative number of reference signals received by the communication device, or the third indication information is used to indicate the sequence number, index, or arrangement of the reference signals received by the communication device. In other words, the third indication information is used to indicate the number of beam maintenance currently performed by the communication device 1800 and the first terminal device, and the third indication information is similar to the function of C-DAI.

[0312] In some possible implementations, the reference signal includes at least one of: CSI-RS, SSB, S-SSS, S-PSS or DMRS.

[0313] In some possible implementations, the measurement result of the reference signal includes at least one of: RSRP of the reference signal, RSRQ of the reference signal, SNR of the reference signal, or SINR of the reference signal.

[0314] In some possible implementations, the time domain resources of the first time-frequency resource are at least one OFDM symbol, at least one time slot, or at least one subframe, and the time domain resources of the i-th time-frequency resource among the K time-frequency resources are at least one OFDM symbol, at least one time slot, or at least one subframe, where the value of i is 1, 2…, K.

[0315] Furthermore, the communication device 1800 may also include a storage module (unit), and the interface module (unit) 1820 may be a transceiver, an input / output interface, or an interface circuit. The storage unit is used to store instructions executed by the interface module 1820 and the processing module 1810. The processing module 1810, the interface module 1820, and the storage unit are coupled to each other. The storage unit stores instructions, the processing module 1810 is used to execute the instructions stored in the storage unit, and the interface module 1820 is used to perform specific signal transmission and reception under the control of the processing module 1810.

[0316] It should be understood that the specific process of each unit in the communication device 1800 executing the above corresponding steps can be referred to the description of the first terminal device or the second terminal in the relevant embodiment of the method 1100 in the previous text. For the sake of brevity, it is not repeated here.

[0317] It should be understood that the interface module 1820 may be a transceiver, an input / output interface, or an interface circuit. The storage unit may be a memory. The processing module 1810 may be implemented by a processor.

[0318] Figure 19 shows a schematic block diagram of another communication device 1900 provided by this application. As shown in Figure 19 , communication device 1900 may include a processor 1910, a memory 1920, a transceiver 1930, and a bus system 1940. The various components of communication device 1900 are coupled together via bus system 1940. In addition to including a data bus, bus system 1940 may also include a power bus, a control bus, and a status signal bus. However, for the sake of clarity, various buses are labeled as bus system 1940 in Figure 19 . For ease of illustration, Figure 19 is only schematically drawn.

[0319] The communication device 1800 shown in FIG18 or the communication device 1900 shown in FIG19 can implement the steps performed by the first terminal device or the second terminal device in each embodiment of the aforementioned method 1100. Similar descriptions can refer to the descriptions of the corresponding methods described above. To avoid repetition, they are not repeated here.

[0320] It should also be understood that the communication device 1800 shown in Figure 18 or the communication device 1900 shown in Figure 19 can be a terminal device, or the terminal device can include the communication device 1800 shown in Figure 18 or the communication device 1900 shown in Figure 19.

[0321] It should also be understood that the terminal device in this application may also be a chip, chip system, or processor that supports the terminal device to implement the method, and the embodiments of this application are not limited here.

[0322] It should also be understood that the division of units in the above device is merely a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, the units in the device can all be implemented in the form of software called through processing elements; or all be implemented in the form of hardware; or some units can be implemented in the form of software called through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in a memory in the form of a program, and called by a certain processing element of the device to execute the function of the unit. Here, the processing element can also be called a processor, which can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processor element or in the form of software called through the processing element.

[0323] In one example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0324] Figure 20 is a schematic diagram of the structure of a terminal device 2000 provided in this application. The above-mentioned communication device 1800 or communication device 1900 can be configured in the terminal device 2000. Alternatively, the communication device 1800 or communication device 1900 itself can be the terminal device 2000. In other words, the terminal device 2000 can perform the actions performed by the first terminal device or the second terminal device in the above-mentioned method 1100. Optionally, for ease of explanation, Figure 20 only shows the main components of the terminal device. As shown in Figure 20, the terminal device 2000 includes a processor, memory, control circuit, antenna, and input and output devices.

[0325] The processor is primarily used to process communication protocols and communication data, as well as to control the entire terminal device, execute software programs, and process software program data, for example, to support the terminal device in executing the actions described in the above-mentioned sidelink information transmission method embodiment. The memory is primarily used to store software programs and data, such as the codebook described in the above-mentioned embodiment. The control circuit is primarily used to convert baseband signals into radio frequency signals and to process radio frequency signals. The control circuit and antenna together can also be called a transceiver, which is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, displays, keyboards, etc., are primarily used to receive data input by the user and output data to the user.

[0326] When the terminal device is powered on, the processor reads the software program stored in the storage unit, interprets and executes the program's instructions, and processes the program's data. When data needs to be transmitted wirelessly, the processor performs baseband processing on the data to be transmitted and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits it via the antenna as electromagnetic waves. When data is sent to the terminal device, the RF circuit receives the RF signal via the antenna, converts it into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes it.

[0327] Those skilled in the art will appreciate that, for ease of explanation, FIG20 shows only one memory and processor. In an actual terminal device, multiple processors and memories may exist. The memory may also be referred to as a storage medium or storage device, etc., which is not limited in the present embodiment.

[0328] For example, a processor may include a baseband processor and a central processing unit (CPU). The baseband processor is primarily responsible for processing communication protocols and communication data, while the CPU is primarily responsible for controlling the entire terminal device, executing software programs, and processing data from software programs. The processor in Figure 20 integrates the functions of both a baseband processor and a CPU. Those skilled in the art will appreciate that the baseband processor and the CPU may also be independent processors interconnected via a bus or other technology. Those skilled in the art will appreciate that a terminal device may include multiple baseband processors to accommodate different network standards, multiple CPUs to enhance its processing capabilities, and that the various components of the terminal device may be connected via various buses. The baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip. The CPU may also be referred to as a central processing circuit or a central processing chip. The functionality for processing communication protocols and communication data may be built into the processor or stored as a software program in a storage unit, with the processor executing the software program to implement the baseband processing functionality.

[0329] By way of example, in the embodiment of the present application, the antenna and control circuit having transceiver functions may be regarded as the transceiver unit 2001 of the terminal device 2000, and the processor having a processing function may be regarded as the processing unit 2002 of the terminal device 2000. As shown in FIG20 , the terminal device 2000 includes a transceiver unit 2001 and a processing unit 2002. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. Optionally, the device used to implement the receiving function in the transceiver unit 2001 may be regarded as a receiving unit, and the device used to implement the transmitting function in the transceiver unit 2001 may be regarded as a transmitting unit, that is, the transceiver unit 2001 includes a receiving unit and a transmitting unit. By way of example, the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0330] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0331] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0332] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0333] The embodiment of the present application further provides a communication system, which includes: the first terminal device and the second terminal device mentioned above. Optionally, the communication system may also include the network device mentioned above.

[0334] The embodiment of the present application further provides a computer-readable medium for storing computer program code, where the computer program includes instructions for executing the sidelink information transmission method of the embodiment of the present application in the above method 1100. The readable medium can be a read-only memory (ROM) or a random access memory (RAM), which is not limited in the embodiment of the present application.

[0335] The present application also provides a computer program product, which includes instructions. When the instructions are executed, the first terminal device performs terminal device operations corresponding to the above method, or the second terminal device performs terminal device operations corresponding to the above method.

[0336] An embodiment of the present application further provides a system-on-chip (SoC), comprising: a processing unit and a communication unit. The processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin, or a circuit. The processing unit may execute computer instructions to cause the chip within the communication device to perform any of the sidelink information transmission methods provided in the embodiments of the present application.

[0337] Optionally, any one of the communication devices provided in the above embodiments of the present application may include the system chip.

[0338] Optionally, the computer instructions are stored in a storage unit.

[0339] Optionally, the storage unit is a storage unit within the chip, such as a register, cache, etc. The storage unit may also be a storage unit located outside the chip within the terminal, such as a ROM or other type of static storage device that can store static information and instructions, RAM, etc. The processor mentioned in any of the above may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the above-mentioned method for main system information transmission. The processing unit and the storage unit may be decoupled and respectively provided on different physical devices, and connected by wired or wireless means to implement the respective functions of the processing unit and the storage unit, so as to support the system chip to implement the various functions in the above-mentioned embodiments. Alternatively, the processing unit and the memory may also be coupled on the same device.

[0340] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0341] The terms "uplink" and "downlink" appearing in this application are used to describe the direction of data / information transmission in specific scenarios. For example, the "uplink" direction generally refers to the direction of data / information transmission from the terminal to the network side, or the direction of data / information transmission from a distributed unit to a centralized unit. The "downlink" direction generally refers to the direction of data / information transmission from the network side to the terminal, or the direction of data / information transmission from a centralized unit to a distributed unit. It can be understood that "uplink" and "downlink" are only used to describe the transmission direction of data / information, and the specific starting and ending devices of the data / information transmission are not limited.

[0342] Various objects such as various messages / information / equipment / network elements / systems / devices / actions / operations / processes / concepts that may appear in this application are named. It can be understood that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as scenarios, contexts or usage habits. The understanding of the technical meaning of the technical terms in this application should be mainly determined from the functions and technical effects embodied / executed in the technical solutions.

[0343] Those skilled in the art will appreciate that the methods in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiments of the present application is executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program or instruction can be stored in a computer-readable storage medium or transmitted via the computer-readable storage medium. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server that integrates one or more available media.

[0344] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0345] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0346] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0347] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0348] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: USB flash drives, mobile hard drives, read-only memories (ROMs), and random access memories.

[0349] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for transmitting information on a side link, characterized in that: The method comprises: The first terminal device sends K reference signals to the second terminal device on K time-frequency resources respectively, where different time-frequency resources among the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1; The first terminal device receives feedback information from the second terminal device on a first time-frequency resource, the feedback information including: first indication information for indicating whether the measurement results of the K reference signals meet a condition, or at least one of second indication information for indicating a comparison result of the measurement results of the K reference signals with a threshold.

2. The method according to claim 1, characterized in that Different time-frequency resources among the K time-frequency resources correspond to different beam directions.

3. The method according to claim 1 or 2, characterized in that: The satisfying condition includes: each measurement result of the K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of the K reference signals in N consecutive measurements is greater than or equal to the first threshold, N is an integer greater than or equal to 1, and each measurement result includes the measurement results of the K reference signals.

4. The method according to claim 1 or 2, characterized in that: The condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2…, K, and the feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition.

5. The method according to claim 1 or 2, characterized in that: The condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where the value of i is 1, 2…, K, and the feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition.

6. The method according to any one of claims 3 to 5, characterized in that The length of the first indication information is 1 bit.

7. The method according to any one of claims 1 to 6, characterized in that The second indication information is used to indicate: a comparison result between a measurement result of an i-th reference signal among the K reference signals and a fifth threshold, where i is 1, 2..., K, and the feedback information includes K pieces of the second indication information.

8. The method according to any one of claims 1 to 7, characterized in that The time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located, and the first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K.

9. The method according to any one of claims 1 to 8, characterized in that The first time-frequency resource corresponds to a second beam, and the second beam is predefined or preconfigured.

10. The method according to any one of claims 1 to 9, characterized in that The first terminal device sends K reference signals to the second terminal device on K time-frequency resources respectively, including: The first terminal device sends K reference signals and third indication information to the second terminal device on K time-frequency resources respectively, and the third indication information is used to indicate; the cumulative number of reference signals sent by the first terminal device, or the third indication information is used to indicate the sequence number, index or arrangement of the reference signal sent by the first terminal device.

11. The method according to any one of claims 1 to 10, characterized in that The reference signal includes: at least one of CSI-RS, SSB, S-SSS, S-PSS or DMRS.

12. The method according to any one of claims 1 to 11, characterized in that The measurement result of the reference signal includes: at least one of RSRP of the reference signal, RSRQ of the reference signal, SNR of the reference signal, or SINR of the reference signal.

13. The method according to any one of claims 1 to 12, characterized in that The time domain resources of the first time-frequency resources are at least one OFDM symbol, at least one time slot, or at least one subframe, and the time domain resources of the i-th time-frequency resource among the K time-frequency resources are at least one OFDM symbol, at least one time slot, or at least one subframe, where the value of i is 1, 2…, K.

14. A method for transmitting information on a side link, characterized in that: The method comprises: The second terminal device receives K reference signals from the first terminal device on K time-frequency resources respectively, where different time-frequency resources among the K time-frequency resources do not overlap in the time domain, and K is an integer greater than 1; The second terminal device sends feedback information to the first terminal device in a first time-frequency resource, and the feedback information includes: first indication information for indicating whether a measurement result of the K reference signals measured by the second terminal device on the K time-frequency resources satisfies a condition, or second indication information for indicating a comparison result of the measurement result of the K reference signals with a threshold.

15. The method according to claim 14, characterized in that Different time-frequency resources among the K time-frequency resources correspond to different beam directions.

16. The method according to claim 14 or 15, characterized in that The satisfying condition includes: each measurement result of the K reference signals in N consecutive measurements is greater than or equal to a first threshold, and the first indication information indicates: each measurement result of the K reference signals in N consecutive measurements is greater than or equal to the first threshold, N is an integer greater than or equal to 1, and each measurement result includes the measurement results of the K reference signals.

17. The method according to claim 14 or 15, characterized in that The condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: a comparison result of the measurement result of the i-th reference signal among the K reference signals and a second threshold is within a threshold range, or a comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is greater than or equal to at least one of a third threshold, where i is 1, 2…, K, and the feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition.

18. The method according to claim 14 or 15, characterized in that The condition that the measurement result of the i-th reference signal among the K reference signals satisfies includes: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, where the value of i is 1, 2…, K, and the feedback information includes K first indication information, and the first indication information corresponding to the measurement result of the i-th reference signal is used to indicate: the measurement result of the i-th reference signal satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition.

19. The method according to any one of claims 16 to 18, characterized in that The length of the first indication information is 1 bit.

20. The method according to any one of claims 14 to 19, characterized in that The second indication information is used to indicate: a comparison result between a measurement result of an i-th reference signal among the K reference signals and a fifth threshold, where i is 1, 2..., K, and the feedback information includes K pieces of the second indication information.

21. The method according to any one of claims 14 to 20, characterized in that The time domain position of the first time-frequency resource is determined based on a first value and the time domain resource where the i-th reference signal among the K reference signals is located, and the first value is used to indicate: the time domain offset value between the time domain position where the i-th reference signal among the K reference signals is located and the time domain position of the first time-frequency resource, and the value of i is 1, 2…, K.

22. The method according to any one of claims 14 to 21, characterized in that The first time-frequency resource corresponds to a third beam, and the third beam is predefined or preconfigured.

23. The method according to any one of claims 14 to 22, characterized in that The second terminal device receives K reference signals from the first terminal device on K time-frequency resources respectively, including: The second terminal device receives K reference signals and third indication information from the first terminal device on the K time-frequency resources respectively, where the third indication information is used to indicate: a cumulative number of reference signals received by the second terminal device, or the third indication information is used to indicate a sequence number, index or arrangement of the reference signals received by the second terminal device; The method further comprises: The second terminal device determines the measurement results of the K reference signals based on the received reference signal and the third indication information.

24. A communication device, characterized in that: include: A unit for executing the respective steps of the method according to any one of claims 1 to 13, or a unit for executing the respective steps of the method according to any one of claims 14 to 23.

25. A communication device, characterized in that: The method comprises at least one processor and an interface circuit, wherein the at least one processor is used to execute: the method according to any one of claims 1 to 13, or the method according to any one of claims 14 to 23.

26. A communication device, characterized in that: include: A processor, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the device executes: the method according to any one of claims 1 to 13, or the method according to any one of claims 14 to 23.

27. A terminal device, characterized in that: The terminal device comprises: a communication device according to any one of claims 24 to 26.

28. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes: the method as claimed in any one of claims 1 to 13, or the method as claimed in any one of claims 14 to 23.

29. A chip, characterized in that: It comprises: a processor, configured to call and run a computer program from a memory, so that a communication device equipped with the chip executes: a method as claimed in any one of claims 1 to 13, or a method as claimed in any one of claims 14 to 23.

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