WO2025087146A1 - Method for transmitting information on sidelink and communication apparatus - Google Patents

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

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 in this application.

Technical Field

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

In the new radio (NR) communication system, beams (or beam pairs) are maintained between base stations and terminal devices through channel state information reference signals (CSI-RS), and the measurement results of the measured CSI-RS are reported through media access control elements (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, beams (or beam pairs) also need to be maintained between 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. At present, 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, which occupies more resources and consumes a lot of communication resources.

Summary of the invention

The present application provides a method and communication device for information transmission on a side link, which aggregates 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, but indicates the comparison result of the measurement result of the beam with a threshold, or indicates whether the beam measurement result meets a condition. The amount of data that needs to be fed back can be effectively reduced, the length of the feedback information and the communication resources required for the feedback information can be reduced, and in this way, the amount of data that needs to be fed back can be effectively reduced, thereby reducing the consumption of communication resources.

In the first aspect, a method for information transmission on a side link is provided. The execution subject of the method may 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, and 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 at least one of the second indication information for indicating the comparison results of the measurement results of the K reference signals with the threshold; 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.

The method for information transmission on the side link provided by the first aspect is to receive the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) fed back by the second terminal device within the same time unit (on the first time-frequency resource) and the threshold, or whether the measurement results of multiple reference signals meet the conditions, instead of directly feeding back the measurement results of multiple reference signals, and 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.

Exemplarily, the reference signal identifiers corresponding to the K reference signals are different, and different beams can be indicated by different reference signal identifiers.

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 from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold).

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.

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.

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

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.

In a possible implementation of the first aspect, K reference signals may be sent multiple times in succession. The multiple sending of K reference signals may be understood as: the sending of K reference signals by the first terminal device is regarded as one time or a group of sendings. The first terminal device may send multiple times or groups of sendings in succession.

In a possible implementation of the first aspect, the condition is satisfied including: 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 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). Or used to indicate: 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). Wherein, 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.

In a possible implementation of the first aspect, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the measurement results of the i-th reference signal in m consecutive measurements are all greater than or equal to a threshold value, and 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 greater than or equal to the threshold value (that is, 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. One first indication information needs to carry the reference signal identifier or beam identifier corresponding to the indication information.

In a possible implementation of the first aspect, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is within the threshold range, or the 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 the third thresholds, i is 1, 2…, K, and 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 satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The length of a first indication information can be 1 bit, or can be greater than 1 bit, for example, 2 bits or 3 bits. The amount of data required for feedback can be further reduced, and the feedback information or the first indication information only needs 1 bit, further reducing the consumption of communication resources.

In a possible implementation of the first aspect, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold value, 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. 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 a first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits. The amount of data that needs to be fed back may be further reduced, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

In a possible implementation of the first aspect, the second indication information is used to indicate that the measurement feedback information of the i-th reference signal among the K reference signals includes K second indication information. One second indication information is used to indicate the comparison result of the measurement result of a reference signal with the fifth threshold value, i is 1, 2..., K, and the feedback information includes K second indication information. 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. The amount of data that needs to be fed back can be further reduced, and the feedback information or the first indication information only needs 1 bit, which further reduces the consumption of communication resources.

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.

Exemplarily, at least one of the threshold range, the first threshold, the second threshold, the third threshold, the fourth threshold, or the fifth threshold 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).

Exemplarily, the situation that the measurement result of a certain reference signal meets the condition and the situation that the condition is 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 condition.

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.

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.

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

In a possible implementation manner of the first aspect, 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 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, and K third indication information need 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 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 the possible leakage of a reference signal (or beam) or the problem with the beam, and can quickly adjust the subsequent beam reception. It can also improve the accuracy and efficiency of receiving reference signals, and can accurately determine the measurement results corresponding to each reference signal, thereby ensuring the accuracy of the feedback information.

In the second aspect, a method for information transmission on a side link is provided, and the execution subject of the method can be a second terminal device, or a chip, a chip system, or a processor that supports the second terminal device to implement the method, and the method includes: the second terminal device receives K reference signals from the first terminal device on K time-frequency resources respectively, and 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 result of the second terminal device measuring the K reference signals on the K time-frequency resources meets the condition, or second indication information for indicating the comparison result of the measurement result of the K reference signals with the threshold value. Or, the feedback information includes: indication information for indicating the measurement result 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 method for information transmission on the side link provided in the second aspect is to feed 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, and 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.

In a possible implementation manner of the second aspect, the K reference signals may be sent multiple times in succession, and the multiple sending of the K reference signals may be understood as: the sending of the K reference signals by the first terminal device is regarded as one time or a group of sendings, and the first terminal device may To send multiple times or groups continuously.

In a possible implementation of the second aspect, the condition is satisfied including: 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 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). Or used to indicate: 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). Wherein, 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.

In a possible implementation of the second aspect, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is within the threshold range, or the 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 the third thresholds, i is 1, 2…, K, and 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 satisfies the condition or the measurement result of the i-th reference signal does not satisfy the condition. The length of a first indication information can be 1 bit, or can be greater than 1 bit, for example, 2 bits or 3 bits, etc. The amount of data required for feedback can be further reduced, and the feedback information or the first indication information only needs 1 bit, further reducing the consumption of communication resources.

In a possible implementation of the second aspect, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold value, 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. 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 a first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits, etc. The amount of data that needs to be fed back may be further reduced, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

In a possible implementation of the second aspect, the second indication information is used to indicate that the measurement feedback information of the i-th reference signal among the K reference signals includes K second indication information. One second indication information is used to indicate the comparison result of the measurement result of a reference signal with the fifth threshold value, i is 1, 2…, K, and the feedback information includes K second indication information. 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. The amount of data that needs to be fed back can be further reduced, and the feedback information or the first indication information only needs 1 bit, which further reduces the consumption of communication resources.

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 via signaling, or the first threshold may be preconfigured (or configured).

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 feedback information.

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.

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

In a possible implementation manner of the second aspect, 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 the sequence number, index or arrangement of the reference signal received by the second 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 second terminal device receives K reference signals on K time-frequency resources, it receives a reference signal and a third indication information on each time-frequency resource. The second terminal device needs to receive K third indication information, 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 beam maintenance the first terminal device and the second terminal device are currently performing, 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 the possible leakage of a reference signal (or beam) or the 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. The measurement result corresponding to each reference signal can be accurately determined, and the accuracy of the feedback information is guaranteed.

In a third aspect, a communication device is provided, the device comprising: a module for executing each step in the above first aspect or any possible implementation of the first aspect (for example, including a processing module and an interface module), or a module for executing each step in the above second aspect or any possible implementation of the second aspect (for example, including a processing module and an interface module). The device may be a terminal device, or a chip, a chip system, or a processor in the terminal device.

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 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.

In a fourth aspect, a communication device is provided, the device comprising at least one processor and a memory, the at least one processor being configured to execute: the method in the first aspect or any possible implementation of the first aspect, or the method 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.

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.

In a fifth aspect, a communication device is provided, the device comprising at least one processor and an interface circuit, the at least one processor being used to execute: the method in the first aspect or any possible implementation of the first aspect, or the method 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.

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.

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.

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.

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.

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.

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 above second aspect or any possible implementation of the second aspect.

The technical effects corresponding to the eighth aspect and any possible implementation method of the eighth aspect can be found in the first aspect above. The technical effects corresponding to any one of the implementation methods in the first aspect, or the technical effects corresponding to the second aspect and any one of the implementation methods in the second aspect, will not be repeated here.

In the ninth aspect, a chip is provided, which includes: a processor, used to call and run 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 above second aspect or any possible implementation of the second aspect.

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 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.

BRIEF DESCRIPTION OF THE DRAWINGS

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.

FIG. 2 is a schematic diagram showing an example in which different beams have different directions and different RSRPs corresponding to different beams.

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

FIG4 is a schematic diagram of an example in which a base station uses the optimal CSI-RS for BM beam to send a downlink signal to a UE.

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.

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

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

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

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

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.

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

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.

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

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

FIG. 15 is a schematic diagram of another example of the content included in feedback information sent by a second terminal device to a first terminal device according to an embodiment of the present application.

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.

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.

FIG18 is a schematic block diagram of a communication device provided in an embodiment of the present application.

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

Figure 20 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution in this application will be described below in conjunction with the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise specified, "/" means or, for example, A/B can mean A or B; "and/or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, 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.

In the embodiment of the present application, the terminal device or 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 a 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 the Linux operating system, Unix operating system, Android operating system, iOS operating system or windows operating system, etc. The application layer includes applications such as browsers, address books, word processing software, instant messaging software, etc. Moreover, the embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided in the embodiments of the present application, as long as it is possible to communicate according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application, for example, the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in a terminal device or a network device that can call and execute a program.

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" 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 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 memory (EPROM), 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.

Wireless communication technology has experienced rapid development in the past few decades, from the first generation of wireless communication systems based on analog communication systems, to the second generation (2G) wireless communication systems represented by the global system for mobile communication (GSM), to the 3G wireless communication systems represented by wideband code division multiple access (WCDMA), to the long-term evolution (LTE) 4G wireless communication systems and 5G wireless communication systems that have been widely used and achieved great success in the world. The services supported by wireless communication systems have also evolved from the initial voice and text messages to the current support for wireless high-speed data communications. At the same time, the number of wireless connections around the world is experiencing a continuous and rapid growth, and various new types of wireless services have also emerged in large numbers, such as the Internet of Things and autonomous driving, which have put forward higher requirements for the next generation of wireless communication systems, namely 5G systems.

As the number of communication demand scenarios increases, device-to-device (D2D) communication technology has developed rapidly in recent years because of its advantage of being able to communicate directly with or without network infrastructure. The application of D2D communication technology can reduce the burden on cellular networks, reduce the battery power consumption of user devices, increase data rates, and meet the needs of proximity services.

Generally speaking, D2D communication technology refers to the technology of direct communication between two user equipments (user equipment can be called terminal equipment) or multiple user equipments (user equipment, UE). Typical D2D technologies include: Bluetooth, wireless fidelity (wireless fidelity, WiFi), WiFi direct connection (WiFi-Direct), etc. In the wireless communication network defined by the 3rd generation partnership project (3GPP), the air interface for direct communication between user equipment and user equipment is called PC5 interface, so the direct communication between user equipment and user equipment is also called PC5 communication. From the perspective of the link, the link between user equipment and user equipment can be called sidelink (SL), which corresponds to the uplink (UL) and downlink (DL) in the current communication system.

SL communication includes a variety of usage scenarios, such as: vehicle to everything (V2X), communication between smart terminals, etc. V2X, also known as "Internet of Vehicles", is the communication between cars and other vehicles or devices that may affect cars, including vehicle to vehicle (V2V), vehicle to pedestrian (V2P), vehicle to infrastructure (V2I), vehicle to network (V2N). Typical scenarios of communication between smart terminals include: communication between mobile phones and wearable devices, communication between augmented reality (AR)/virtual reality (VR) helmets or glasses and smart screens, communication between sensors, etc.

In wireless communication systems, according to the different frequency bands used, they can be divided into licensed bands and unlicensed bands. In the licensed band, the user equipment uses spectrum resources based on the scheduling of the central node (such as the base station). In the LTE communication system, cellular mobile communications began to study the unlicensed band, giving rise to technologies such as LTE in unlicensed spectrum (LTE-U), Licensed Assisted Access (LAA), and Multi-line (Multe Fire). However, the unlicensed band has been used by some wireless communication devices, such as Wi-Fi. The LTE system introduces a listen-before-talk (LBT) mechanism to enable it to coexist with Wi-Fi devices, while enabling LTE Uu interface communication on the unlicensed band. The Uu interface can also be understood as the interface for communication between the user equipment and the wireless access network equipment (such as the base station). In addition to the Uu interface, there is also a PC5 interface, which is the communication interface between UE and UE. Enabling SL communication in the unlicensed band in the local area is An important evolution direction, the corresponding protocol technology can be collectively referred to as SL communication in the unlicensed frequency band (sidelink in Unlicensed spectrum, SL-U). Similar to the Uu interface, UE working through SL-U also needs to coexist with nearby Wi-Fi devices based on the LBT mechanism.

In addition, user devices using D2D technology are generally half-duplex devices, that is, the user device can only receive or send information at the same time and does not have the ability to send and receive at the same time.

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

First: beam.

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 a beam can be beam forming technology or other technical means. The beam forming technology can be specifically 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 detection signals, etc.

Beam, which can also be understood as a spatial resource, can refer to a transmit or receive 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 perspective of transmission and reception, beams can be divided into transmitting beams and receiving beams.

Transmit beam: The transmitting end device (also called the transmitting end device) sends a signal with a certain beamforming weight, so that the transmitted signal forms a beam with spatial directivity. In the uplink direction, the transmitting end device can be a terminal device (the terminal device can also be called a user device); in the downlink direction, the transmitting end device can be a network device (the network device can also be called a wireless access network device). In other words, the transmit beam refers to the use of multiple antennas to transmit a directional beam using beamforming technology.

Receive beam: The receiving device receives the signal with a certain beamforming weight, so that the received signal forms a beam with spatial directivity. 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, the receive beam means that the direction of the received signal is also directional, pointing as much as possible to the direction of the transmitted beam, so as to further improve the received signal-to-noise ratio and avoid interference between users.

Transmit beamforming: When a transmitting device with an antenna array sends a signal, a specific amplitude and phase are set on each antenna element of the antenna array so that the transmitted signal has a certain spatial directivity, that is, the signal power is high in some directions and low in some directions. The direction with the highest signal power is the direction of the transmit beam. The antenna array includes multiple antenna elements, and the specific amplitude and phase attached are the beamforming weights.

Receive beamforming: When a receiving device with an antenna array receives a signal, a specific amplitude and phase are set on each antenna element of the antenna array so that the power gain of the received signal has directionality, that is, the power gain is high when receiving signals in certain directions, and low when receiving signals in other directions. The direction with the highest power gain when receiving a signal is the direction of the receive beam. The antenna array includes multiple antenna elements, and the specific amplitude and phase added are the beamforming weights.

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.

Optionally, in the embodiment of the present application, "beam" may also be called a spatial filter, or a spatial filter or spatial parameters, the transmitting beam may also be called a spatial transmitting filter, and the receiving beam may also be called a spatial receiving filter.

Different beams can be considered as different resources, or as using different beamforming weights. The same information or different information can be sent using (through) different beams. A beam pair is based on the concept of beams, i.e., a transmit beam and a receive beam that have a beam pairing relationship. A beam pair usually includes a transmit beam of a transmitting device and a receive beam of a receiving device.

In a communication system such as a 5G new radio (NR) system, both network equipment and terminal equipment can generate one or Multiple transmit beams, and one or more receive beams. Before transmitting data, beam alignment is required.

Second: reference signals and reference signal resources.

Reference signals can be used for channel measurement or channel estimation, etc. Reference signal resources can be used to configure transmission properties of reference signals, such as time-frequency resource locations, port mapping relationships, power factors, and scrambling codes, etc. A transmitting device can send reference signals based on reference signal resources, and a receiving device can receive reference signals based on reference signal resources.

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

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 (CSI-RS resource), SSB resources, and SRS resources (SRS resource).

It should be noted that the above-mentioned SSB can also be called synchronization signal/physical broadcast channel block (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.

In order to distinguish different reference signal resources, each reference signal resource may correspond to a reference signal resource identifier, for example, a CSI-RS resource indicator (CSI-RS resource indicator, CRI), an SSB resource indicator (SSBRI), or an SRS resource index (SRS resource index, SRI). The SSB resource identifier may also be referred to as an SSB index.

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 the present application. The present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

Third: The process of beam training in NR Uu.

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

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

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

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 SSB in different directions using different beams (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 measures the SSB after receiving the SSB through a receiving beam (or a wide beam), thereby obtaining 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 receiving strength of the SSB in different directions, thereby determining the best SSB beam at this time. As shown in Figure a of Figure 2, the directions of the four different beams are different. As shown in Figure b of Figure 2, the RSRPs corresponding to different beams are different.

The following describes the SSB beam determination process of the base station side sending the downlink signal according to the two states of the UE:

The first type: If the UE is in the initial access phase of the idle state, the UE feeds back to the base station by including the SSB index information of the optimal SSB beam (i.e., the beam corresponding to the SSB with the greatest reception intensity) in the preamble of random access. The base station confirms the SSB beam (Tx beam) used for subsequent downlink signal transmission based on the SSB index (there is a mapping relationship between the SSB index and the beam). The base station can directly reuse the beam when receiving the uplink signal.

The second type: If the UE is in the connected data transmission stage, the UE feeds back the SSB measurement results to the base station through the measurement report. The base station determines the optimal SSB beam (i.e. the beam corresponding to the SSB with the greatest receiving strength) as the transmission beam (Tx beam) used for subsequent downlink signal transmission based on the SSB measurement results. The base station can directly reuse the beam when receiving uplink signals.

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

When the UE receives an SSB signal, it receives the signal by beam scanning according to the SSB time-frequency resource location informed in the system message (initial access phase in idle state) or the RRC reconfiguration message (data transmission phase in connected state), and can determine the wide beam for the UE to receive the downlink signal. The UE can directly reuse the beam when sending an uplink signal.

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 received SSB index (ie, SSB index) is obtained.

As shown in Figure 3, since there is a corresponding relationship between the SSB index and the PRACH channel (i.e., the PRACH time-frequency resource), the UE determines the corresponding PRACH time-frequency resource based on the detected SSB index, 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 best beam information by measuring the RSRP of the SSB, and then provide feedback on the corresponding PRACH time-frequency resource. The base station can obtain the best beam information reported by the UE based on the PRACH channel.

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

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

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 (Identity, 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 the 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 intensity) as the transmit beam (Tx beam) used for subsequent downlink signal transmission. The base station can directly reuse this beam when receiving uplink signals.

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

P3 process: UE fine tuning process.

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 a downlink signal to the UE. That is, the base station sends CSI-RS to the UE on the optimal beam determined by CSI-RS. When the UE receives the signal, it uses beam scanning to receive the signal according to the CSI-RS for BM time-frequency resource position informed in the RRC configuration message sent by the base station, so as to determine the narrow beam in which the UE receives the downlink signal. The UE can directly reuse the beam when sending an uplink signal.

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

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 best beam pair caused by relative position movement or channel changes, NR Uu measures the pairing between 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).

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).

Fourth: hybrid automatic repeat request (HARQ) codebook.

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 as a string of continuous bits to form a HARQ codebook. Based on the HARQ codebook, the UE feeds back the HARQ feedback information of multiple bits corresponding to multiple downlink transport blocks (TB) or code block groups (CBG) to the base station at one time, effectively improving the efficiency of HARQ feedback.

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

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

NACK is a state 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;

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

It should be understood that only in downlink transmission, the receiver (UE) needs to send HARQ feedback to the transmitter (base station). For uplink transmission, since the receiver and the scheduler are both on the base station side, when the base station side finds a decoding error, it can directly notify the UE to perform uplink retransmission without instructing the UE through HARQ feedback.

After clarifying the HARQ feedback status, the UE also needs to know when to send HARQ feedback. The base station can control the sending 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 sending 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 feedback the HARQ feedback of the PDSCH to the base station in time slot 6.

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

For example, as shown in FIG6 , the UE needs to feed back to the base station 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 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.

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.

First: Semi-static codebook:

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) According to the configuration information sent by the high-level signaling, the possible value K1 set (K1 set) of K1 is obtained. 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 connected in series in the order from front to back in the time domain, and all time slots are connected in the order of carrier frequency or serving cell index to generate a HARQ codebook and feedback it in time slot n+K0+K1.

In other words, for the semi-static codebook, once the high-level parameters configure the K1 set, the UE will feedback the HARQ information of the time slots that may transmit data corresponding to each K1 value included in the K1 set before the current time slot in each uplink time slot, unless the following situations occur:

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

If bandwidth part (BWP) switching occurs in UE, 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.

For example, FIG7 shows a schematic diagram of a semi-static codebook. In the example shown in FIG7, taking the 8:2 time slot ratio as an example, in FIG7, "D" represents a downlink time slot, "U" represents an uplink slot, and "S" represents an uplink and downlink coexistence slot. Assuming that the UE can receive data from up to 3 carriers (component carriers, CCs) at the same time, and the K1 set received by the UE is {1, 3, 4, 6}, then for the target HARQ feedback time slot (taking slot 8 as an example), the UE will feedback the HARQ information on slot 2, slot 4, slot 5 and slot 7 on slot 8, and whether the UE has received data on these time slots.

In the example shown in Figure 7:

Carrier 1 transmits and feedbacks based on a single TB. And there is data transmission on slot 2, slot 4, slot 5 and slot 7.

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

Carrier 3 transmits and feedbacks based on CBG, and a time slot can transmit up to 4 CBGs. Four CBGs are transmitted on slot 2, two CBGs are transmitted on slot 5, and no data is transmitted on the remaining two time slots (slot 4 and slot 7).

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 composed of the feedback sequence of carrier 1, the feedback sequence of carrier 2, and the feedback sequence of carrier 3. Specifically, it includes:

The UE receives only one TB on carrier 1, so for each downlink transmission on carrier 1 (i.e. slot 2, slot 4, slot 5 The HARQ information fed back in each time slot of slot 2, slot 4, slot 5 and slot 7 is 1 bit, which is indicated as "①". For carrier 1, each time slot of slot 2, slot 4, slot 5 and slot 7 needs to feed back 1 bit, and the feedback sequence on carrier 1 needs 4 bits.

UE can receive up to 2 TBs simultaneously on carrier 2, so the HARQ information fed back for each downlink transmission on carrier 2 is 2 bits. Even if only one TB is received on slot 2, the bit corresponding to the other TB that has not been received will also feed back NACK. For carrier 2, 2 bits need to be fed back for each time slot in slot 2, slot 4, slot 5, and slot 7, respectively, as "②③". The feedback sequence on carrier 2 requires 8 bits.

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

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.

In the example in Figure 7, the Type 1 semi-static codebook feedback sequence contains 28 bits, but in fact only 13 bits are valid feedback. It can be seen that the disadvantage of the Type 1 semi-static codebook is that it occupies more resources, because HARQ feedback is required regardless of whether the corresponding TB or CBG has data transmission.

First: Dynamic codebook:

Dynamic codebook: also known as Type 2 HARQ Codebook. The terminal device detects PDCCH at each PDCCH monitoring occasion, and uses the time domain resource allocation field and PDSCH-to-HARQ-timing field in the detected PDCCH to first determine the time slot number of the PDSCH according to the time slot offset value K0 from PDCCH to PDSCH contained in the Time Domain Resource Allocation field and the time slot number of the PDCCH. For example, the PDCCH is numbered in time slot n. According to K0, the time slot number of the PDSCH can be determined as n+K0. Then, the HARQ-ACK timing is obtained according to the PDSCH-to-HARQ-timing field, that is, the time slot offset value K1 from PDSCH to the corresponding ACK/NACK feedback, so as to know the time slot number of the corresponding ACK/NACK feedback. For example, if the time slot number of the PDSCH is n+K0, the time slot 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 PDCCH of the PDSCH corresponding to the ACK/NACK 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 4 data PDSCH 1 to PDSCH 4 is to be sent, and the PDCCH corresponding to PDSCH 1 to PDSCH 4 is PDCCH 1 to PDCCH 4, and PDCCH 1 to PDCCH 4 is in the order from front to back in the time domain, then the feedback information of PDSCH 1 to PDSCH 4 is concatenated in sequence to generate a HARQ codebook.

It can be seen that the dynamic codebook is different from the semi-static codebook. The UE will only send HARQ feedback information to the location where data is transmitted, that is, the codebook size changes dynamically with the number of scheduled carriers, TBs or CBGs. Corresponding to the example shown in Figure 7, using a dynamic codebook, the HARQ feedback sequence only needs 13 bits (all feedback is ACK).

If DCI reception is normal, the dynamic codebook has obvious advantages 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 cause all feedback contained in the current codebook to fail to be received correctly.

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:

Counter DAI (counterDAI, C-DAI): indicates the number of downlink scheduled transmissions of TB or CBG from the moment the DCI is received to the current moment. In other words, C-DAI is used to indicate the number of downlink transmissions scheduled up to the DCI. C-DAI counts in the carrier dimension first and then in the time domain dimension.

Total DAI (T-DAI) in carrier aggregation configuration: indicates the total number of downlink transmissions on all carriers so far. 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.

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.

For example, as shown in FIG8, FIG8 is a schematic diagram of a DAI value in downlink data transmission. In the figure, each box in Figure 8 represents a time slot, and each time slot transmits a TB (i.e., a data packet). It is assumed that the base station needs to transmit a total of 8 data packets. DAI is (x, y) means: the value of C-DAI is x, and the value of T-DAI is y. For example, DAI is (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 is (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 is (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 packet loss occurs in time slot 3 on carrier 1, 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 packets with DAI of (5, 5) and the data packets with DAI of (7, 7) and the value of C-DAI (the value of C-DAI is 7, indicating that the 8th data packet is currently being transmitted).

In the example shown in FIG8, if a dynamic codebook is used, as shown in FIG9, in the manner of first increasing the carrier and then increasing the time slot, the dynamic codebook requires 8 bits of feedback information. If a semi-static codebook is used, as shown in FIG9, in the manner of first increasing the time slot and then increasing the carrier, the semi-static codebook requires 12 bits of feedback information.

In NR Uu, the base station and UE maintain beams (or beam pairs) through CSI-RS reference signals, and report the measured CSI-RS RSRP and other measurement results through MAC CE. One reference signal (such as CSI-RS) corresponds to one CSI-RS measurement report (CSI-reporting), or one beam pair corresponds to one CSI-RS measurement report. Since the RSRP range is very large, in NR Uu, 7 bits are needed to quantize the RSRP value, that is, the length of the measurement report corresponding to a CSI-RS requires 7 bits. The quantization information of this 7-bit length corresponds to the RSRP range of [-140, -44] dBm, and the difference between the maximum and minimum RSRP values (step size) = 1 dB.

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 uses 7-bit quantization to measure the reference signal. 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 needs 7-bit quantization to measure the reference signal, resulting in a communication pair using a lot of communication resources to feedback the measurement results of the reference signal (i.e., beam). The amount of data that needs to be fed back is very large, and the communication resource consumption is serious. 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 resource consumption will be even more serious.

In view of this, the present application provides a method for information transmission on a side link, in which feedback information (i.e., measurement results) corresponding to multiple beams (i.e., multiple beam pairs) are aggregated and sent 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 measurement result of the beam with a threshold, or indicates whether the beam measurement result meets the condition. The information length required to indicate whether the measurement result meets the condition 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 in 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.

The following is an exemplary description of a communication system to which the method provided by the present application can be applied.

The method provided in the present application can be applied in the scenario of side link communication.

Exemplarily, FIG10 is a schematic diagram of a communication system to which the method provided in the present application can be applied. As shown in FIG10 a, terminal device 1 and terminal device 2 are both within the coverage of the same network device. As shown in FIG10 b, terminal device 1 is within the coverage of the network device, and terminal device 2 is not within the coverage of the network device. As shown in FIG10 c, terminal device 1 is within the coverage of network device 1, and terminal device 2 is within the coverage of network device 2. Terminal device 1 can communicate with terminal device 2 using sidelink communication resources in a manner of base station scheduling, and the communication resources may include authorized frequency bands and unauthorized frequency bands. Alternatively, terminal device 1 may communicate without adopting the base station scheduling mode, and terminal device 1 may select resources from the resource pool, that is, select resources for sidelink communication from the resource pool, and the resources may include unauthorized frequency bands and unauthorized frequency bands. As shown in FIG10 d, terminal device 1 and terminal device 2 are not within the same Within the coverage range of a network device, that is, they are all within the non-coverage range, so the terminal device 1 and the terminal device 2 can use the resource self-selection method to build a side link for communication.

It is understood that the spectrum used for communication on the side link may be an unlicensed frequency band, a licensed frequency band, or a dedicated frequency band, etc. Before using the unlicensed frequency band for transmission, channel access needs to meet certain requirements, such as the need to perform LBT, etc. The embodiments of the present application are not limited here.

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.

In a possible scenario, the network device can be any device with wireless transceiver functions. For example, it includes: traditional macro base stations (evolved node B, eNB) in traditional universal mobile telecommunications systems (UMTS) and LTE communication systems, micro base stations (eNB) in heterogeneous networks (HetNet) scenarios, baseband processing units (BBU) and remote radio units (RRU) in distributed base station scenarios, baseband pools (BBU pool) RRU in cloud radio access networks (CRAN) scenarios, gNBs in future wireless communication systems, base stations of subsequent evolution of 3GPP, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc. Base stations can be: macro base stations, micro base stations, micro-micro base stations, small stations, relay stations, or balloon stations, etc. Network devices can also be servers, wearable devices, or vehicle-mounted devices, etc.

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, a logical module or software that can implement all or part of the functions of a wireless access network device.

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.

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

It should be understood that the communication system shown in FIG10 is merely exemplary and should not impose any limitation on the communication system applicable to the embodiments of the present application. For example, the communication system shown in FIG10 may also include more or smaller terminal devices, and the network device or terminal device 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 no longer shown one by one in the figures.

The method provided by the present application is described below with reference to specific examples.

It should be understood that in the embodiments of the present application, the method is described by taking the terminal device as the execution subject of the execution method as an example. As an example but 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 here.

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, and the embodiment of the present application is not limited here.

As shown in Fig. 11 , the method 1100 shown in Fig. 11 may include S1110 to S1130. The steps in the method 1100 are described in detail below in conjunction with Fig. 11 .

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.

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

It should be understood that in an embodiment of the present application, the K reference signals correspond to different beams, 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.

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 early to late in the time domain. For example, the value of K is 3, the first time-frequency resource can occupy 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+3.

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.

Exemplarily, 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 limit the time domain length of each time-frequency resource.

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

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

Optionally, the frequency domain resources in the K time-frequency resources may include: a licensed frequency band, an unlicensed frequency band, or a dedicated frequency band, etc. The embodiment of the present application is not limited here.

Optionally, S1110 can also be expressed as: the first terminal device sends a reference signal to the second terminal device on each of the K time-frequency resources, and 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.

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.

For example, the second terminal device can detect the reference signal on K time-frequency resources respectively, and obtain the measurement result 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 result of K reference signals can also be called the measurement result of K beams.

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.

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

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.

As a possible implementation, in S1120, after the second terminal device obtains the measurement results of K reference signals, In one step, determine whether the measurement results of the K reference signals (i.e., the measurement results of the K beams) meet the conditions, and generate indication information (i.e., first indication information) according to 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.

As another possible implementation method, in S1120, after the second terminal device obtains the measurement results of the 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.

Optionally, as a possible implementation method, 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 a first indication information is used to indicate whether the measurement result of a reference signal (or a beam) meets the condition, or a second indication information is used to indicate the comparison result of the measurement result of a reference signal (or a beam) with a threshold.

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 the conditions, and obtain indication information corresponding to the measurement results of the K reference signals. 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 conditions.

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.

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

Optionally, as a possible implementation method, in S1130, the second terminal device may 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 also referred to as 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.

Optionally, as another possible implementation, in S1130, the second terminal device may feed back second indication information for indicating the comparison result between the measurement result of K reference signals and 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 between the measurement results of K beams and the threshold to the first terminal device in the same time unit, that is, the comparison result between the measurement result of each beam in the multiple beams and 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 between the measurement result of the beam and 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.

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.

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, etc. The embodiment of the present application does not limit the time domain length of the first time-frequency resource.

For example, FIG12 shows a schematic diagram of K time-frequency resources and a first time-frequency resource. In the example shown in FIG12, 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, respectively. The first terminal device sends reference signals on these four time-frequency resources. 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 fed back on time slot 9.

The second terminal device detects the reference signals in time slot 1, time slot 3, time slot 5 and time slot 7 respectively, obtains the measurement results of the reference signals, and then sends the first indication information indicating whether the measurement results of the four reference signals meet the conditions, or the second indication information indicating the comparison results of the measurement results of the four reference signals with the 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 in one time unit (time slot 9) for feedback.

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 may be positioned from early to late 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 in the order of the reference signals (the order of the beams).

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, and 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, and the indication information is used to indicate the measurement results corresponding to the K reference signals.

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

Optionally, in some possible implementations, K reference signals may be sent multiple times in succession, and the multiple sending of K reference signals may be understood as: the sending of K reference signals by the first terminal device is regarded as one time or a group of sending, and 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, and 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: taking 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 sending of reference signals. Of course, the time interval between any two sendings (that is, the time interval between the time of sending the last reference signal in the previous time and the time interval between sending the first reference signal 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 the K reference signals each time. That is, the second terminal device needs to detect the measurement results of N×K reference signals.

For example. FIG. 13 shows an example of a situation where K reference signals are periodically sent. As shown in FIG. 13 a, the time interval between two adjacent transmissions is ΔT. Four reference signals are sent each time, namely reference signal 1 to reference signal 4. Reference signal 1 corresponds to beam 1 (reference signal 1 is sent using beam 1), reference signal 2 corresponds to beam 2 (reference signal 2 is sent using beam 2), reference signal 3 corresponds to beam 3 (reference signal 3 is sent using beam 3), and reference signal 4 corresponds to beam 4 (reference signal 1 is sent using beam 4). The reference signals sent for the second time also include reference signals 1 to reference signals 4. Reference signal 1 corresponds to beam 1 (reference signal 1 is sent using beam 1), reference signal 2 corresponds to beam 2 (reference signal 2 is sent using beam 2), reference signal 3 corresponds to beam 3 (reference signal 3 is sent using beam 3), and reference signal 4 corresponds to beam 4 (reference signal 1 is sent using beam 4). Reference signals 1 to 4 are also sent each subsequent time. FIG. 13 a shows a case where the order of the K reference signals (i.e., the order of the K beams) is the same during two groups (twice) of transmissions. FIG. 13 b shows a case where the order of the K reference signals (i.e., the order of the K beams) is different during two groups (twice) of transmissions.

In the example shown in FIG13 , assuming that the first terminal device sends four reference signals three times in succession, 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.

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 (ie, K beams).

As a possible implementation, when the first terminal device sends K reference signals multiple times (for example, N times) in succession Under this condition, if the measurement results of 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 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 these 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 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 N×K reference signals (the measurement results of 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). Among them, 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, and the communication resources required for the first indication information are less (the feedback information or the first indication information only needs 1 bit), further reducing the consumption of communication resources.

Optionally, as another possible implementation, when the first terminal device sends K reference signals for multiple consecutive 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 (i.e., 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 (i.e., 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 (i.e., 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.

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

In other words, when the first terminal device sends K reference signals multiple times (for example, N times) in succession, 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 can be greater than 1 bit, such as 2 bits or 3 bits. The embodiment of the present application does not limit the length of the first indication information.

Of course, as another possible implementation, when the first terminal device sends K reference signals for 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 for 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 succession, the measurement results of the 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.

Of course, 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 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 may 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 the feedback information or the first indication information from 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 terminal device sends feedback information or first indication information, it can be determined that when the first terminal device sends K reference signals multiple times (for example, N times) in succession, 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.

Of course, when the first terminal device sends K reference signals multiple times (for example, N times) in succession, 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 used 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.

Optionally, in some possible implementations, when the first terminal device sends K reference signals for multiple consecutive times (for example, N times), in the N measurements, if the measurement results of the i-th reference signal in the K reference signals are greater than or equal to a threshold value (for example, a first threshold value) in consecutive m measurements of the second terminal device, then 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 consecutive m measurements are 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 a first indication information, the length of a first indication information can be 1 bit, and the value is a first value (for example, 0 or 1; or the indicated state is ACK), which is used to indicate that the measurement results of this reference signal in consecutive m measurements are 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. 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 may be less than or equal to K.

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 consecutive m measurements, 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 consecutive m 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 consecutive m 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.

In other words, when the first terminal device sends K reference signals multiple times (for example, N times) in succession, the first indication information corresponding to the ith reference signal can be used to indicate that the measurement results of the ith 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 ith 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 may be less than or equal to K.

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). The present application embodiment does not limit this.

It should be understood that in the embodiments of the present application, "predefined" content or thresholds can be understood as information defined by standards, which does not require other equipment configurations and is recorded/written in advance in the hardware and/or software of the terminal device itself, or can be understood as information that cannot be changed by network equipment or other terminal devices. "Preconfigured" content or thresholds can be understood as information recorded/written in advance in the hardware and/or software of the terminal device itself, which is determined by the manufacturer of the equipment and can be changed through software or hardware.

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

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 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 a 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 a first indication information may be 1 bit. In S1130, the feedback information includes K first indication information, and the length of the feedback information may be K bits. This can further reduce the amount of data that needs to be fed back, and the first indication information requires fewer communication resources (the feedback information only requires K bits), further reducing the consumption of communication resources.

Exemplarily, the measurement result of the i-th reference signal may satisfy the condition that:

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

Optionally, the above-mentioned threshold range, second threshold, third threshold or fourth threshold may be: a measurement value of a reference signal on 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.

Optionally, at least one of the above-mentioned threshold range, the second threshold, the third threshold or the 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 information such as DCI, RRC signaling, SIB information or MIB, or indicated or configured by the first terminal device to the second terminal device through signaling such as side link control information (SCI) or PC5 RRC, or indicated or configured by the second terminal device to the first terminal device through signaling such as SCI or PC5 RRC.

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

At least one of the comparison result of 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 the fourth threshold.

Optionally, the comparison result between the measurement result of the reference signal and the threshold may include a difference (a value obtained by subtracting the threshold from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold), etc. The following example will be described using the comparison result as a difference as an example.

Exemplarily, it is assumed 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 (3) is satisfied, it is determined that the measurement result of the i-th reference signal satisfies the condition:

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

RSRP _i -TH2 ≥ δ or |RSRP _i -TH2| ⁿ ≥ δ0<n, (2), for example, n = 1/2, 2.

RSRP _i ≥TH4 (3)

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:

RSRP _i -TH2 ≤ δ or |RSRP _i -TH2| ⁿ ≤ δ0<n, (4), for example, n = 1/2, 2.

RSRP _i ≤TH4 (5)

It should be understood that in the embodiments 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 embodiments of the present application are not limited here.

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.

For example, in combination with the example shown in FIG12, assuming that: the measurement result of reference signal 1 meets the condition, the measurement result of reference signal 2 meets the condition, the measurement result of reference signal 3 does not meet the condition, and the measurement result of reference signal 4 meets the condition, 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 FIG14, reference signal 1 The first indication information corresponding to reference signal 3 (beam 3) and reference signal 4 (beam 4) respectively may indicate ACK, and the first indication information corresponding to reference signal 3 (beam 3) may indicate NACK.

Of course, when each reference signal (each beam) corresponds to a first indication information, and a 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 length of a first indication information may also be greater than 1 bit, such as 2 bits or 3 bits, etc., to indicate: indicating that the measurement result of a reference signal (or a beam) meets or does not meet the condition. The embodiment of the present application does not limit the length of the first indication information.

Optionally, in some possible implementations of the present application, after the first terminal device detects the measurement result of a certain 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 interval where the value obtained by subtracting the fifth threshold from the measurement result of the i-th reference signal, or the interval where the value obtained by subtracting the fifth threshold from the measurement result of the i-th reference signal, or the interval where the value obtained by subtracting the measurement result of the i-th reference signal from the fifth threshold, or the interval where the value obtained by subtracting the measurement result of the i-th reference signal from the fifth threshold. 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 (taking 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.

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.) There is no limitation on the value of the fifth threshold in the embodiment of the present application.

Optionally, the fifth threshold may 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.

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.

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.

Exemplarily, 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 , and in the 4-bit indication information, the difference or step size of the results indicated by two adjacent bit states (converted to decimal, that is, two adjacent numerical values) is 1 dB. For example, the value of the 4-bit second indication information is "0000", indicating RSRP _i -RSRP _t = -8dB, "0001" indicating RSRP _i -RSRP _t = -7dB, "0010" indicating RSRP _i -RSRP _t = -6dB, "0011" indicating RSRP _i -RSRP _t = -5dB, "0100" indicating RSRP _i -RSRP _t = -4dB, and so on, "0011" indicating RSRP _i -RSRP _t = 0dB; "0101" indicating RSRP _i -RSRP _t <= 1dB; "0110" indicating RSRPi-RSRPt = 2dB. That is, 4 bits are used to quantify the difference. In other words, different bit states of the 4-bit second indication information can be used to represent (or indicate) a threshold set {-8dB, -7dB, ... 7dB, 8dB}. Further optionally, the step size between two adjacent difference values may be (pre)configured or predefined, for example, the difference between the two difference values is 1 dB.

For example, in conjunction with the example shown in FIG12 , it is assumed that: the difference of the fifth threshold of the measurement result of reference signal 1 is Δ1, the difference of the fifth threshold of the measurement result of reference signal 2 is Δ2, the difference of the fifth threshold of the measurement result of reference signal 3 is Δ3, and the difference of the fifth threshold of the measurement result of reference signal 4 is Δ4. Then, in time slot 9, the content included in the feedback information sent by the second terminal device to the first terminal device may be as shown in FIG15 , and the second indication information corresponding to reference signal 1 (beam 1) to reference signal 4 (beam 4) respectively may indicate the difference of the fifth threshold of the measurement result of the reference signal.

Of course, the comparison result between the measurement result of the i-th reference signal and the fifth threshold value may include other situations besides the difference, such as a difference range or a difference interval between the measurement result of a reference signal and the fifth threshold value. Exemplarily, the comparison result between the measurement result of the i-th reference signal and the fifth threshold value may include: The difference is within a certain range. In this case, the second indication information corresponding to the measurement result of the ith reference signal can be used to indicate that the difference between the measurement result of the ith reference signal and the fifth threshold 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 ith reference signal is RSRP _i , the fifth threshold is RSRP _t , the ith reference signal corresponds to 4 bits of indication information (for example, "0000"), and in the 4 bits of indication information, the difference or step size of the result indicated by the two adjacent bit states (converted to decimal, that is, two adjacent numerical values) is 1dB. For example, the value of the 4-bit second indication information is "0000", indicating RSRP _i -RSRP _t <=-8dB, "0001" indicating -8dB<RSRP _i -RSRP _t <=-7dB, "0010" indicating -7dB<RSRP _i -RSRP _t <=-6dB, "0011" indicating -6dB<RSRP _i -RSRP _t <=-5dB, "0100" indicating -5dB<RSRP _i -RSRP _t <=-4dB, and so on, "0101" indicating 0dB<RSRP _i -RSRP _t <=1dB;"0110" indicating 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 two difference intervals differ by 1dB.

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 message or a second indication message, and the feedback information needs to include the first indication message or the second indication message corresponding to the reference signals on multiple carriers. The arrangement order of these multiple first indication messages or multiple second indication messages 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.

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.

It should also be understood that a time slot position for common feedback needs to be agreed upon between the first terminal device and the second terminal device, 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.

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 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.

For example, in conjunction with the example shown in FIG12, the value of K is 4, and the time domain resource where the first reference signal (reference signal 1) is located is time slot 1. For the first reference signal, the first value may be 8, and the time domain position 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. For the second reference signal, the first value may be 6, and the time domain position 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. For the third reference signal, the first value may be 4, and the time domain position 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. For the fourth reference signal, the first value may be 2, and the time domain position 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 the second indication information corresponding to the reference signal 1 on time slot 1, the first indication information or the second indication information corresponding to the reference signal 2 on time slot 3, the first indication information or the second indication information corresponding to the reference signal 3 on time slot 5, and the first indication information or the second indication information corresponding to the reference signal 4 on time slot 7.

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, which improves Accuracy and efficiency of sending feedback information. The first terminal device and the second terminal device have consistent understanding of the time domain location of the first time-frequency resource and which reference information is fed back on the first time-frequency resource, ensuring the success rate and effectiveness of sending feedback information.

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: at least one of the first indication information for indicating whether the measurement result of the i-th reference signal meets the condition, or 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 sending 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.

It should be understood that in the 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 through signaling. In other words, the second terminal device knows which time-frequency resources to receive the reference signal. Exemplarily, the signaling may include SCI.

Optionally, the K time-frequency resources as a whole may appear periodically, for example, as shown in FIG. 13 .

Optionally, the K time-frequency resources may also appear periodically. For example, as shown in FIG. 16 , the K time-frequency resources are periodic, and the time interval between two adjacent time-frequency resources in the K time-frequency resources is the same.

It should also be understood that in the embodiment of the present application, the transmission beam (third beam) by which the second terminal device sends feedback information on the first time-frequency resource and the receiving beam (second beam) by which the first terminal device receives feedback information on the first time-frequency resource may 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 may be predefined, or may be preconfigured (or configured). The embodiment of the present application is not limited here.

In some possible implementations of the present application, since the beam is greatly affected by occlusion, if the second terminal device receives the maintained beam sequence and number normally, 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 abnormality, 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.

Therefore, in response to the above-mentioned 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 information (also referred to as the third indication information) to the second terminal device while sending each reference signal. The third indication information 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 information to the second terminal device on each time-frequency resource among the K time-frequency resources, and then needs to send K third indication information, and each third indication information corresponds to a reference signal or a beam. In other words, the third indication information is used to indicate which beam maintenance the first terminal device and the second terminal device are currently performing. The third indication information is similar to the function of C-DAI. Through the third indication information, the second terminal device can effectively determine the possible leakage of a reference signal (or beam) or the problem with the beam, and can quickly adjust the subsequent beam reception. It can also improve the accuracy and efficiency of receiving reference signals, and can accurately determine the measurement results corresponding to each reference signal, thereby ensuring the accuracy of the feedback information.

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 then needs to receive K third indication information.

For example, in combination with 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, and the time domain resource where the third reference signal (reference signal 2) is located is time slot 4. The time domain resource where the fourth 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 message to the second terminal device to indicate: as of the current reference signal (the first reference signal), the total number of reference signals sent by the first terminal device. For the first reference signal, the value indicated by the indication message may be 0, indicating: as of the current reference signal (the first reference signal), the total number of reference signals sent by the first terminal device is 1. When sending the second reference signal, the first terminal device may send an indication message to the second terminal device to indicate: as of the current reference signal (the second reference signal), the total number of reference signals sent by the first terminal device. 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 the first terminal device sends the third reference signal, it 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 third reference signal). For the third reference signal, the value indicated by the indication message may be 2, indicating: the total number of reference signals sent by the first terminal device as of the current reference signal (the third reference signal) is 3. When the first terminal device sends the fourth reference signal, it 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: the total number of reference signals sent by the first terminal device as of the current reference signal (the fourth reference signal) is 4.

When the second terminal device receives the reference signal, it is assumed that the first, third and fourth reference signals are correctly received, and 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.

After determining that the second reference signal is not 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 indicating whether the measurement result of reference signal 2 meets the condition, or the second indication information indicating the comparison result of the measurement result of 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.

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 third beam (beam of the third reference signal) to obtain the fourth beam (beam of the fourth 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.

The method for information transmission on the side link provided by the present application feeds back the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with the threshold value in the same time unit, or feeds back whether the measurement results of multiple reference signals meet the conditions, rather than directly feeding back the measurement results of multiple reference signals, and 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.

It should be understood that the above is only to help those skilled in the art better understand the embodiments of the present application, rather than to limit the scope of the embodiments of the present application. According to 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. Such modifications, changes or combined solutions also fall within the scope of the embodiments of the present application.

It should also be understood that the division of the methods, 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 methods, categories, situations and embodiments can be combined without contradiction.

It should also be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not intended to limit the scope of the embodiments of the present application. The sequence should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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 to each other. For the sake of brevity, they will not be repeated here.

The above embodiment of the present application is described in detail in conjunction with Figures 1 to 17. Below, the communication device of the embodiment of the present application is described in detail in conjunction with Figures 18 to 20.

In this embodiment, the terminal device (including the first terminal device and the second terminal device) can be divided into functional modules according to the above method. For example, it can be divided into various functional modules corresponding to various functions, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

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

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 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 codes and data, etc. The communication module can be used to support the communication between the terminal device and other devices.

Among them, the processing module can be a processor or a controller. It can implement or execute various exemplary logic boxes, modules and circuits described in conjunction with the disclosure of this application. The processor can 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, etc. The storage module can be a memory. The communication module can specifically be a radio frequency circuit, a Bluetooth chip, a Wi-Fi chip, or other devices that interact with other electronic devices.

Exemplarily, FIG18 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, and each module or unit in the communication device 1800 is respectively used to execute each action or processing process performed by the first terminal device or the second terminal device in the above method 1100.

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 .

In some embodiments:

The interface module 1820 is used to: send 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 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.

The embodiment of the present application provides a communication device, which receives the comparison result of the measurement results of multiple reference signals (i.e., multiple beams) fed back by the second terminal device within the same time unit (on the first time-frequency resource) and the threshold, or whether the measurement results of multiple reference signals meet the conditions, instead of directly feeding back the measurement results of multiple reference signals, and 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 the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

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

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 from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold).

In some possible implementations, the condition is satisfied including: 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 K reference signals. Measurement results. 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 met). Or used to indicate: 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 met). Each measurement result includes the measurement results of K reference signals. The amount of data that needs to be fed back can be further reduced, and the feedback information or the first indication information only requires 1 bit, further reducing the consumption of communication resources.

In some possible implementations, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is within the threshold range, or the 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 the third thresholds, i is 1, 2…, K, and 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 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 may be 1 bit, or may be greater than 1 bit, such as 2 bits or 3 bits.

In some possible implementations, the measurement result of the i-th reference signal among the K reference signals satisfies a condition including: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, i is 1, 2…, K, and 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: 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 may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

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

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

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 the possible leakage of a certain reference signal (or beam) or the 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 result 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, and 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.

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

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.

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 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.

In other embodiments:

The interface module 1820 is used to: receive 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 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: a first indication for indicating whether the measurement result of the communication device measuring the K reference signals on the K time-frequency resources meets the condition information, or at least one of second indication information used to indicate a comparison result of the measurement results of the K reference signals with a threshold.

The embodiment of the present application provides a communication device, which feeds back the comparison results of the measurement results of multiple reference signals (i.e., multiple beams) with the threshold value in the same time unit (on the first time-frequency resource), or feeds back whether the measurement results of multiple reference signals meet the conditions, instead of directly feeding back the measurement results of multiple reference signals, and 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 the communication resources required for the feedback information, thereby reducing the consumption of communication resources.

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

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 from the measurement result of the reference signal, or a value obtained by subtracting the measurement result of the reference signal from the threshold).

In some possible implementations, the condition is satisfied including: 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 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). Or used to indicate: 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). Wherein, 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.

In some possible implementations, the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the comparison result of the measurement result of the i-th reference signal among the K reference signals and the second threshold is within the threshold range, or the 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 the third thresholds, i is 1, 2…, K, and 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: 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 may be 1 bit, or may be greater than 1 bit, such as 2 bits or 3 bits.

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, 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. The length of one first indication information may be 1 bit, or may be greater than 1 bit, for example, 2 bits or 3 bits.

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

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

In some possible implementations, the interface module 1820 is also used to: receive K reference signals and third indication information from the first terminal device on K time-frequency resources respectively, 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 signal 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.

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

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.

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 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.

Further, 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 drive of the processing module 1810.

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

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.

FIG. 19 is a schematic block diagram of another communication device 1900 provided by the present application. As shown in FIG. 19 , the communication device 1900 may include a processor 1910, a memory 1920, a transceiver 1930, and a bus system 1940. The various components of the communication device 1900 are coupled together through the bus system 1940, wherein the bus system 1940 may include a power bus, a control bus, and a status signal bus in addition to a data bus. However, for the sake of clarity, various buses are labeled as bus system 1940 in FIG. 19 . For ease of representation, FIG. 19 is only schematically drawn.

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 in the aforementioned corresponding methods. To avoid repetition, they are not described here.

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

It should also be understood that 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, and the embodiments of the present application are not limited here.

It should also be understood that the division of units in the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And the units in the device can all be implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some units can also be implemented in the form of software calling 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 in a certain chip of the device. In addition, it can also be stored in the memory in the form of a program, and called and executed by a certain processing element of the device. The processing element here 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 an integrated logic circuit of hardware in the processor element or in the form of software calling through a processing element.

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 (ASIC), or one or more digital signal processors (DSP), or one or more field programmable gate arrays (FPGA), 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 can 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).

FIG20 is a schematic diagram of the structure of a terminal device 2000 provided by the present 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 execute the actions performed by the first terminal device or the second terminal device in the above-mentioned method 1100. Optionally, for ease of explanation, FIG20 only shows the main components of the terminal device. As shown in FIG20, the terminal device 2000 includes a processor, a memory, a control circuit, an antenna, and an input and output device.

The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above-mentioned method embodiment for information transmission on the side link. The memory is mainly used to store software programs and data, for example, to store the codebook described in the above-mentioned embodiment. The control circuit is mainly used to convert the baseband signal and the radio frequency signal and to process the radio frequency signal. The control circuit and the antenna can also be used together. It is called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that, for ease of explanation, FIG. 20 shows only one memory and processor. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiments of the present application.

For example, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process the communication protocol and communication data, and the central processing unit is mainly used to control the entire terminal device, execute the software program, and process the data of the software program. The processor in Figure 20 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, interconnected by technologies such as buses. Those skilled in the art will understand that the terminal device may include multiple baseband processors to adapt to different network formats, and the terminal device may include multiple central processing units to enhance its processing capabilities. The various components of the terminal device may be connected through various buses. The baseband processor may also be described as a baseband processing circuit or a baseband processing chip. The central processing unit may also be described as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data may be built into the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

Exemplarily, in the embodiment of the present application, the antenna and the control circuit with transceiver functions can be regarded as the transceiver unit 2001 of the terminal device 2000, and the processor with processing function can be regarded as the processing unit 2002 of the terminal device 2000. As shown in FIG. 20, the terminal device 2000 includes a transceiver unit 2001 and a processing unit 2002. The transceiver unit can 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 can be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 2001 can be regarded as a sending unit, that is, the transceiver unit 2001 includes a receiving unit and a sending unit. Exemplarily, the receiving unit can also be referred to as a receiver, a receiver, a receiving circuit, etc., and the sending unit can be referred to as a transmitter, a transmitter or a sending circuit, etc.

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 the processor may be any conventional processor, etc.

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).

The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or downloaded from a computer. A computer-readable storage medium is transmitted 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 by wired (e.g., infrared, wireless, microwave, etc.) means. 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 hard disk.

The embodiment of the present application further provides a communication system, the communication system comprising: the above-mentioned first terminal device and the above-mentioned second terminal device. Optionally, the communication system may also include the above-mentioned network device.

The embodiment of the present application further provides a computer readable medium for storing computer program code, wherein the computer program includes instructions for executing the method for transmitting information on the side link of the embodiment of the present application in the above method 1100. The readable medium may be a read-only memory (ROM) or a random access memory (RAM), which is not limited in the embodiment of the present application.

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

The embodiment of the present application further provides a system chip, which includes: a processing unit and a communication unit, the processing unit, for example, may be a processor, and the communication unit, for example, may be an input/output interface, a pin or a circuit, etc. The processing unit may execute computer instructions to enable the chip in the communication device to execute any of the sidelink information transmission methods provided in the above embodiments of the present application.

Optionally, any one of the communication devices provided in the above-mentioned embodiments of the present application may include the system chip.

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

Optionally, the storage unit is a storage unit within the chip, such as a register, a cache, etc. The storage unit may also be a storage unit within the terminal that is located outside the chip, such as a ROM or other types of static storage devices that can store static information and instructions, RAM, etc. Among them, 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 arranged on different physical devices, and connected by wire 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.

It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can 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 can 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).

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, and 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.

In this application, various objects such as various messages/information/equipment/network elements/systems/devices/actions/operations/processes/concepts that may appear are named. It is understandable that these specific names do not constitute a limitation on the relevant objects. The names given may change with factors such as scenarios, contexts or usage habits. The technical meaning of the technical terms in this application should be understood mainly from their technical It is determined by the functions and technical effects embodied/implemented in the technical solution.

Those of ordinary skill in the art will appreciate that the methods in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer 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 may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium or transmitted via the computer-readable storage medium. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server that integrates one or more available media.

Those skilled in the art can 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.

In the several embodiments provided in the present 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 only schematic. For example, the division of the unit is only a logical function division. There may be other division methods in actual implementation, 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.

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

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

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 can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage media include: USB flash drives, mobile hard disks, read-only memory (ROM), and random access.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (29)

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. The method according to claim 1 is characterized in that different time-frequency resources among the K time-frequency resources correspond to different beam directions. The method according to claim 1 or 2 is 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. The method according to claim 1 or 2 is characterized in that the measurement result of the i-th reference signal among the K reference signals satisfies the 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, and 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. The method according to claim 1 or 2 is characterized in that the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, 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. The method according to any one of claims 3 to 5 is characterized in that the length of the first indication information is 1 bit. The method according to any one of claims 1 to 6 is 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. The method according to any one of claims 1 to 7 is 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. The method according to any one of claims 1 to 8 is characterized in that the first time-frequency resource corresponds to a second beam, and the second beam is predefined or preconfigured. 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, comprising: 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. The method according to any one of claims 1 to 10 is characterized in that the reference signal includes: at least one of CSI-RS, SSB, S-SSS, S-PSS or DMRS. The method according to any one of claims 1 to 11 is characterized in that the measurement result of the reference signal comprises: 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. The method according to any one of claims 1 to 12, characterized in that the time domain resource of the first time-frequency resource is at least one OFDM symbol, at least one time slot, or at least one subframe, and the i-th time-frequency resource among the K time-frequency resources is The time domain resource of the source is at least one OFDM symbol, at least one time slot or at least one subframe, and the value of i is 1, 2..., K. 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 at least one of second indication information for indicating a comparison result of the measurement result of the K reference signals with a threshold. The method according to claim 14 is characterized in that different time-frequency resources among the K time-frequency resources correspond to different beam directions. The method according to claim 14 or 15 is 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. The method according to claim 14 or 15 is characterized in that the measurement result of the i-th reference signal among the K reference signals satisfies the 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, and 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. The method according to claim 14 or 15 is characterized in that the measurement result of the i-th reference signal among the K reference signals satisfies the condition including: the measurement result of the i-th reference signal among the K reference signals is greater than or equal to a fourth threshold, the value of 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 method according to any one of claims 16 to 18 is characterized in that the length of the first indication information is 1 bit. The method according to any one of claims 14 to 19 is 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. The method according to any one of claims 14 to 20 is 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. The method according to any one of claims 14 to 21 is characterized in that the first time-frequency resource corresponds to a third beam, and the third beam is predefined or preconfigured. 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, comprising: 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. A communication device, characterized in that it comprises: a unit for executing each step of the method as claimed in any one of claims 1 to 13, or a unit for executing each step of the method as claimed in any one of claims 14 to 23. A communication device, characterized in that it comprises at least one processor and an interface circuit, wherein the at least one processor is used To perform: 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. A communication device, characterized in that it includes: 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 as described in any one of claims 1 to 13, or the method as described in any one of claims 14 to 23. A terminal device, characterized in that the terminal device comprises: the communication device according to any one of claims 24 to 26. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes: the method as described in any one of claims 1 to 13, or the method as described in any one of claims 14 to 23. A chip, characterized in that it includes: a processor, used to call and run a computer program from a memory, so that a communication device equipped with the chip executes: a method as described in any one of claims 1 to 13, or a method as described in any one of claims 14 to 23.