TWI749538B - HARQ feedback method, first terminal and computer readable storage medium - Google Patents

Abstract

The present invention provides a HARQ feedback method, a first terminal, and a computer-readable storage medium. The method includes: receiving signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the first terminal and each second terminal The transmission configuration of the two terminals requires sidelink HARQ ACK/NACK feedback; according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration of the first terminal and each second terminal Information, determine the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal.

Description

HARQ feedback method, first terminal and computer readable storage medium

The present invention belongs to the field of communication technology, and particularly relates to a HARQ feedback method, a first terminal and a computer-readable storage medium.

In the 5G New Radio (NR) system, it supports larger bandwidth, higher throughput, more complex services, and more complex processing technologies that match it. With the further development of the Internet of Vehicles technology, new application scenarios have emerged, such as vehicle formation, advanced driving, sensor information sharing, and remote control. These application scenarios require the provision of broadcast, multicast, and unicast communication on the sidelink (the link for direct communication between the terminal (UE) and the terminal). These application scenarios put forward higher requirements for the sidelink between the UE and the UE, requiring larger data packets to be carried, higher transmission reliability, and longer transmission distances.

In the design of NR V2X (vehicle to X, vehicle to everything), in order to meet the above requirements, HARQ (hybrid automatic repeat request) feedback is an effective means to improve the reliability of data transmission. The HARQ feedback mechanism is introduced in the broadcast communication method to improve transmission reliability. However, in NR V2X sidelink communication, a UE needs to perform unicast communication with multiple UEs at the same time, or a UE needs to perform unicast and multicast communication at the same time. In this case, it may happen that one UE needs to give sidelink ACK (Acknowledgement, confirmation information)/NACK (Non-Acknowledgement, non-acknowledgement) feedback to multiple UEs at the same time. However, multiple sidelink ACK/NACK feedback is prone to conflicts.

The embodiment of the present invention provides a HARQ feedback method, a first terminal, and a computer-readable storage medium to solve the problem that conflicts are likely to occur during the feedback process.

The embodiment of the present invention provides a HARQ feedback method, which is applied to a first terminal, and includes: Receive at least 2 second terminal’s PSCCH (Physical Sidelink Control Channel, PSCCH used to carry the associated PSSCH scheduling signaling) and PSSCH (Physical Sidelink Share Channel, used to carry service data packets) in the same time window. Signal, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; According to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal, determine to perform sidelink HARQ on the PSSCH of the at least one second terminal ACK/NACK feedback.

Optionally, the same time window includes a time slot; The reception of signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window includes: Receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

Optionally, according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal, determine the PSSCH for the at least one second terminal Perform sidelink HARQ ACK/NACK feedback, including: Determine, according to the first information, sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; The first information includes one or more of the following: The service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, where the service characteristics include at least priority and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal.

Optionally, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is The communication is sidelink multicast communication, then the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support the feedback of HARQ ACK and HARQ NACK .

Optionally, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; Geographic location information of the second terminal.

Optionally, determining to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal includes: According to the first criterion, determine to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; The first criterion includes one or more of the following: The PSSCH of the second terminal with a higher priority is given priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority.

If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority.

Optionally, the first criterion also includes: There is sidelink unicast communication between the first terminal and all second terminals. The HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal. The PSSCH information of the second terminal that is correctly received is prioritized for HARQ ACK/ NACK feedback.

Optionally, the first criterion also includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal only supports HARQ NACK feedback, and the PSSCH of the second terminal is the first transmission priority for HARQ NACK Give back.

Optionally, the first criterion also includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal supports HARQ ACK and HARQ NACK feedback, and the PSSCH information of the second terminal that is correctly received is given priority. HARQ ACK/NACK feedback.

Optionally, the first criterion also includes: There is multicast communication between the first terminal and all the second terminals. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as follows: the first terminal supports HARQ ACK and HARQ NACK feedback. The HARQ ACK/NACK feedback mode between the terminal and the second terminal of set 2 is configured so that the first terminal only supports HARQ NACK feedback, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 takes precedence over the sidelink of set 1. HARQ ACK/NACK feedback.

Optionally, the first criterion also includes: There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. The second terminal in set 4 that performs multicast communication preferentially performs sidelink HARQ ACK/ NACK feedback.

Optionally, the first criterion also includes: The first terminal and the second terminal in set 5 are in mode 1 multicast communication, and the second terminal in set 6 is in mode 6 multicast communication, and the PSSCH of the second terminal in mode 1 multicast communication is Give priority to sidelink HARQ ACK/NACK feedback.

Optionally, the determining to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal according to the first criterion includes: The first terminal determines the priority order of the at least two second terminals according to the first criterion; Determine, according to the priority sequence of the at least two second terminals, a set of priority sequences of second terminals that need to perform Sidelink ACK/NACK feedback; The first terminal determines the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priorities; The first terminal determines the corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determines the power required for PSFCH transmission; The first terminal determines the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that all the sets of PSFCHs transmitted by the first terminal determine the total power for PSFCH transmission The sum does not exceed the maximum transmission power of the first terminal.

Optionally, the first terminal determining the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority order includes: Sort the second terminals in the set of priority order from high to low in order of priority, and the number of second terminals in the set of priority order is N, and N is a positive integer greater than or equal to 1; The set initialized by the first terminal for PSFCH transmission is S, and the initialized S set includes the terminal with the highest priority in the set of priority sequences; Initialize i=2; If the following first condition is met, put the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set; Perform the step of increasing i by 1 and returning if the following first condition is met, the PSFCH transmission of the terminal in the i-th position in the set of priority order is put into the S set, until i is greater than N, and the set S is obtained , The PSSCHs of all second terminals in the set S are the PSSCHs of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; The first condition is that the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal.

The embodiment of the present invention also provides a first terminal, including: The receiving module is configured to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; The determining module is used to determine the at least one second terminal according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal PSSCH for sidelink HARQ ACK/NACK feedback. Optionally, the same time window includes a time slot; The receiving module is used to receive the signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

Optionally, the determining module is configured to determine sidelink HARQ ACK/NACK feedback for at least one second terminal PSSCH according to the first information; The first information includes one or more of the following: The service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, where the service characteristics include at least priority and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal.

Optionally, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is The communication is sidelink multicast communication, then the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support the feedback of HARQ ACK and HARQ NACK .

Optionally, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; Geographic location information of the second terminal.

An embodiment of the present invention also provides a first terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and running on the processor, wherein: The transceiver is configured to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; The processor is configured to determine, according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal PSSCH for sidelink HARQ ACK/NACK feedback.

Optionally, the same time window includes a time slot; The transceiver is used to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

Optionally, the processor is configured to determine, according to the first information, sidelink HARQ ACK/NACK feedback for at least one second terminal PSSCH; The first information includes one or more of the following: The service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, where the service characteristics include at least priority and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal. Optionally, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is The communication is sidelink multicast communication, then the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support the feedback of HARQ ACK and HARQ NACK .

Optionally, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; Geographic location information of the second terminal.

Optionally, the processor 1100 is configured to determine, according to the first criterion, to perform sidelink HARQ ACK/NACK feedback on the PSSCH of the at least one second terminal; The first criterion includes one or more of the following: The PSSCH of the second terminal with a higher priority is given priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority.

If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority.

Optionally, the first criterion also includes: There is sidelink unicast communication between the first terminal and all second terminals. The HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal. The PSSCH information of the second terminal that is correctly received is prioritized for HARQ ACK/ NACK feedback.

Optionally, the first criterion also includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal only supports HARQ NACK feedback, and the PSSCH of the second terminal is the first transmission priority for HARQ NACK Give back.

Optionally, the first criterion also includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal supports HARQ ACK and HARQ NACK feedback, and the PSSCH information of the second terminal that is correctly received is given priority. HARQ ACK/NACK feedback.

Optionally, the first criterion also includes: There is multicast communication between the first terminal and all the second terminals. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as follows: the first terminal supports HARQ ACK and HARQ NACK feedback. The HARQ ACK/NACK feedback mode between the terminal and the second terminal of set 2 is configured so that the first terminal only supports HARQ NACK feedback, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 takes precedence over the sidelink of set 1. HARQ ACK/NACK feedback.

Optionally, the first criterion also includes: There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. The second terminal in set 4 that performs multicast communication preferentially performs sidelink HARQ ACK/ NACK feedback.

Optionally, the first criterion also includes: The first terminal and the second terminal in set 5 are in mode 1 multicast communication, and the second terminal in set 6 is in mode 6 multicast communication, and the PSSCH of the second terminal in mode 1 multicast communication is Give priority to sidelink HARQ ACK/NACK feedback.

Optionally, the processor is used for Determine the priority order of the at least two second terminals according to the first criterion; Determine, according to the priority sequence of the at least two second terminals, a set of priority sequences of second terminals that need to perform Sidelink ACK/NACK feedback; Determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority order; Determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determine the power required for PSFCH transmission; Determine the set of PSFCH transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that the sum of the total power determined to perform PSFCH transmission in the set of PSFCH transmitted by the first terminal does not exceed Maximum transmission power of the first terminal.

Optionally, a processor for Sort the second terminals in the set of priority order from high to low in order of priority, and the number of second terminals in the set of priority order is N, and N is a positive integer greater than or equal to 1; The set for initializing PSFCH transmission is S, and the initialized S set includes the terminal with the highest priority in the set of priority order; Initialize i=2; If the following first condition is met, put the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set; Perform the step of increasing i by 1 and returning if the following first condition is met, the PSFCH transmission of the terminal in the i-th position in the set of priority order is put into the S set, until i is greater than N, and the set S is obtained , The PSSCHs of all second terminals in the set S are the PSSCHs of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; The first condition is that the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal.

The embodiment of the present invention also provides a computer-readable storage medium having a program stored on the computer-readable storage medium, and the program is executed by a processor to implement the steps of the HARQ feedback method provided by the embodiment of the present invention.

In the embodiment of the present invention, the PSSCH for at least one second terminal can be determined based on the signals sent on the PSCCH and PSSCH of all the second terminals received, and/or the transmission configuration information of the first terminal and each second terminal. Performing sidelink HARQ ACK/NACK feedback can reduce HARQ ACK/NACK feedback conflicts, thereby reducing the impact of conflicts.

In order to facilitate the reviewers to understand the technical features, content and advantages of the present invention and its achievable effects, the present invention is described in detail in the form of embodiments with accompanying drawings and appendices as follows, and the diagrams used therein , The subject matter is only for the purpose of illustration and auxiliary manual, not necessarily the true scale and precise configuration after the implementation of the present invention. Therefore, it should not be interpreted on the scale and configuration relationship of the attached drawings, and applications that limit the actual implementation of the present invention should not be interpreted The scope is stated first.

In the description of the present invention, it should be understood that the terms "center", "lateral", "upper", "down", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship of indications such as "outside" is based on the orientation or positional relationship shown in the diagrams, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation to The specific azimuth structure and operation cannot be understood as a limitation of the present invention.

Referring to Figure 1, Figure 1 is a schematic diagram of a network structure applicable to an embodiment of the present invention, including a first terminal and a second terminal. As shown in Figure 1, the second terminal includes a terminal UE1 and a terminal UE2, and the first terminal is a terminal UE3. . Both the first terminal and the second terminal can be user terminals (User Equipment, UE) or other terminal devices, such as mobile phones, tablet computers (Tablet Personal Computer), laptop computers (Laptop Computer), and personal digital assistants (personal digital assistants). assistant, PDA for short), Mobile Internet Device (MID) or Wearable Device (Wearable Device), etc. It should be noted that the specific types of the first terminal and the second terminal are not limited in the embodiment of the present invention.

NR Sidelink resource configuration method: As shown in Figures 2 and 3, in NR V2X, there are two types of resource selection methods on sidelink: The first type is the resource selection method assisted by the base station (BS). When the vehicle is covered by the network, the base station can schedule the V2X communication through the cellular, as shown in Figure 2. In this case, the base station sends scheduling information (V2X scheduling grant information) to the V2X terminal to instruct the V2X terminal to transmit information such as the location of the resource. In Figure 2, SL stands for sidelink.

The second type is the way that the UE spontaneously selects resources, as shown in Figure 3, where the UE obtains the location of the idle resource through the sensing method in the configured or pre-configured resource pool, and then selects its own transmission among the idle resources. resource.

The sidelink ACK/NACK feedback method is as follows: In the design of NR V2X, only the sidelink HARQ feedback operation in the case of sidelink unicast and multicast communication is considered. Among them, it is further clarified that the time interval between the HARQ feedback PSFCH and the associated PSSCH is network configuration or pre-configuration.

For sidelink unicast communication, if the receiving UE decodes the received sidelink data packet of the sending UE correctly, it will return ACK information; if the receiving UE fails to correctly decode the received sidelink data packet of the sending UE, then Feedback NACK information.

For sidelink multicast communication, HARQ feedback on sidelink has the following two methods: Method 1: The receiving UE only supports NACK feedback. In this method, if the receiving UE fails to correctly decode the received sidelink data packet of the sending UE, it will return NACK information. If the receiving UE correctly decodes the received sidelink data packet of the sending UE, no information will be returned; Method 2: The receiving UE supports the feedback of ACK and NACK. If the receiving UE decodes the received sidelink data packet of the sending UE correctly, the ACK information is returned; if the receiving UE fails to receive the sidelink data packet of the sending UE If decoded correctly, NACK information will be returned.

In the above two sidelink HARQ feedback methods of sidelink multicast communication, method 1 tends to share one sidelink ACK/NACK channel resource for all receiving UEs, while in method 2, it tends to have independent ACK/NACK for all receiving UEs. Give back resources. For unicast communication, method 2 is used for feedback.

PSFCH (Physical Sidelink Feedback Channel) is used to carry sidelink HARQ ACK/NACK information. In the PSFCH design of NR V2X, the TDM multiplexing method between PSSCH/PSCCH and PSFCH has been clearly supported. The schematic diagram is shown in Figure 4. . PSFCH generally occupies the last few OFDM symbols of a slot.

Please refer to FIG. 5. FIG. 5 is a flowchart of a HARQ feedback method provided by an embodiment of the present invention, which can be applied to a first terminal. As shown in FIG. 5, it includes the following steps: Step 501: Receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; Step 502: According to the received signals sent on the PSCCH and PSSCH of all the second terminals, and/or the transmission configuration information of the first terminal and each second terminal, determine to perform sidelink HARQ on the PSSCH of at least one second terminal ACK/NACK feedback.

The first terminal can receive the signals sent on the PSCCH and PSSCH of the second terminal. In the HARQ feedback process of this embodiment, the signals sent on the PSCCH and PSSCH of at least two second terminals are received within the same time window, and When the transmission configuration of the first terminal and each second terminal requires sidelink HARQ ACK/NACK feedback, at least one second terminal can be determined from the at least two second terminals, and the PSSCH of the at least one second terminal can be sidelinked HARQ ACK/NACK feedback. If the signals sent on the PSCCH and PSSCH of a second terminal are received in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, you can The PSSCH of the two terminals performs sidelink HARQ ACK/NACK feedback.

In an example, one time window may include at least one time slot. In this example, the same time window receives at least two signals sent on the PSCCH and PSSCH of the second terminal, which can be understood as all time slots in the same time window. The sum of the received signals sent on the PSCCH and PSSCH of the second terminal. For example, a time window includes N time slots, N can be an integer greater than or equal to 1, and the N time slots are the first time slot, ..., the N-1th time slot, and the Nth time slot. The first terminal The signals sent on the PSCCH and PSSCH of the second terminal can be received in each time slot. For example, if N is 2, the first terminal receives the signals sent on the PSCCH and PSSCH of a second terminal in the first time slot, and receives the signals sent on the PSCCH and PSSCH of the second terminal in the second time slot, then The signals sent on the PSCCH and PSSCH received in this time window include the signals sent on the PSCCH and PSSCH of the two second terminals, that is, the signals sent on the PSCCH and PSSCH of the second terminal received in the first time slot and Signals sent on the PSCCH and PSSCH of a second terminal received in the second time slot. According to the signals sent on the PSCCH and PSSCH of a second terminal received in the first time slot and the signals sent on the PSCCH and PSSCH of a second terminal received in the second time slot, and/or the first The transmission configuration information of the terminal and each second terminal determines the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal.

As shown in Figure 6, the PSFCH resource configuration can be a configuration where a PSFCH resource pool appears every N time slots, and N can be an integer greater than or equal to 1, as shown in Figure 6, where N is 4 as an example , Gives a schematic diagram of PSFCH resources.

The first terminal receives signals sent on PSCCH and PSSCH in one time slot K, and the processing time is X time slots (for example, X is 2), then the first terminal performs the ACK/NACK corresponding to PSCCH and PSSCH at the earliest The feedback time is after K+X time slots, that is, the earliest PSFCH resource after K+X time slots. The PSFCH resources corresponding to the HARQ ACK/NACK feedback information of the sidelink corresponding to the PSCCH and PSSCH transmitted in the same time window are all located in the same time slot. As shown in Figure 7, each dashed frame represents a time window. Taking the first dashed frame as an example, X is 2, and a PSCCH sent by a second terminal is received in the first time slot in the time window. And the signal sent on the PSSCH, the PSCCH sent by another second terminal and the signal sent on the PSSCH are received in the second time slot in the time window. The ACK/NACK feedback of the signal sent on the PSSCH is the information feedback through the PSFCH resource in the same time slot. The third time slot after the time window) is the same time slot mentioned above, and the PSFCH resource of the time slot is used for feedback. In this way, the HARQ ACK/NACK feedback to multiple second terminals through the PSFCH resources of the same time slot is likely to cause conflicts. Therefore, in this embodiment, the signals transmitted on the PSCCH and PSSCH of all the second terminals received are used. , And/or the transmission configuration information of the first terminal and each second terminal, determine the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal to reduce feedback conflicts.

As shown in Figure 8, a schematic diagram of the time window corresponding to N=1 and X=2 is given. A time window includes a time slot. Each dashed frame represents a time window. The time of the first dashed frame is Taking the window as an example, the first terminal receives the signals sent on the PSCCH and PSSCH sent by at least two second terminals in a time slot of the time window, and the transmission between the first terminal and each second terminal is configured to be performed In the case of sidelink HARQ ACK/NACK feedback, 2 time slots are required for processing, and then it is determined to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal. As shown in Figure 8, the third time slot after the time slot of the time window (the time slot of the time window requires 2 time slots for processing, and the first time slot after processing has PSFCH resources ) In the PSFCH resource, as shown by the corresponding arrow. Taking the time window of the second dashed frame as an example, the first terminal receives the signals sent on the PSCCH and PSSCH sent by at least two second terminals in a time slot of the time window, and the first terminal and each second terminal When the transmission configuration of the second terminal is configured to require sidelink HARQ ACK/NACK feedback, 2 time slots are required for processing, and then it is determined to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal. As shown in Figure 8, the third time slot after the time slot of the time window (the time slot of the time window requires 2 time slots for processing, and the first time slot after processing has PSFCH resources ) In the PSFCH resource, as shown by the corresponding arrow.

As shown in Figure 9, the time window corresponding to N=2 and X=2 is given. A time window includes 2 time slots. Each dashed box represents a time window. The time window of the first dashed box As an example, the first terminal receives at least 2 signals sent on the PSCCH and PSSCH from the second terminal within this time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK In the case of feedback, two time slots are required for processing, and then it is determined to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal. As shown in Figure 9, the third time slot after the time slot of the time window (the time slot of the time window requires 2 time slots for processing, and the first time slot after processing has PSFCH resources ) In the PSFCH resource, as shown by the corresponding arrow.

As shown in Figure 10, the time window corresponding to N=4 and X=2 is given. A time window includes 4 time slots. Each dashed frame represents a time window, and the first dashed frame is the time window As an example, the first terminal receives the signals sent on the PSCCH and PSSCH from at least 2 second terminals in this time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback In the case of, 2 time slots are required for processing, and then it is determined to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal. As shown in Figure 10, the third time slot after the time slot of the time window (the time slot of the time window requires 2 time slots for processing, and the first time slot after processing has PSFCH resources ) In the PSFCH resource, as shown by the corresponding arrow.

In addition, in one embodiment, the time window is not an integer multiple of a time slot, that is, the time window is a non-integer multiple of a time slot, and one of the time slots contains resources occupied by PSCCH/PSSCH (for example, the number of OFDM symbols) and PSFCH occupancy. When the PSCCH/PSSCH processing time is X (for example, X is 2) time slot duration, the time window corresponding to N=1 is shown in Figure 11, and the time window corresponding to N=2 is shown in Figure 11. The time window is shown in Figure 12.

As shown in Figure 11, the time window is less than one time slot, and each dashed frame represents a time window. Taking the time window of the first dashed frame as an example, the first terminal receives at least When the signals sent on the PSCCH and PSSCH sent by 2 second terminals, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, it takes 2 slots for processing (As shown in Figure 11, X=2), and then determine to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal. After two time slots are processed, the feedback is performed through the earliest PSFCH resource, that is, at the position pointed to by the arrow corresponding to the first dashed box in FIG. 11. As shown in Figure 12, the time window is greater than one time slot and less than 2 time slots. Each dashed frame represents a time window. Taking the time window of the first dashed frame as an example, the first terminal receives At least 2 second terminals send signals on the PSCCH and PSSCH, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, it takes 2 time slots to perform Process (as shown in Figure 12, X=2) to determine at least one second terminal for which feedback is required. After two time slots are processed, sidelink HARQ ACK/NACK feedback is performed on the PSSCH of at least one second terminal through the earliest PSFCH resource, that is, at the position pointed to by the arrow corresponding to the first dashed box in Figure 12 .

In addition, in this embodiment, the signals sent on the PSCCH and PSSCH from at least two second terminals are received in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK The feedback is based on receiving the signals sent on the PSCCH and PSSCH sent by at least 2 second terminals, or/and the transmission configuration between the first terminal and each two second terminals, from the at least 2 second terminals In determining the target feedback terminal, that is, the above-mentioned at least one second terminal. Then, based on the transmission configuration information between the first terminal and the target feedback terminal, the target feedback information (HARQ ACK/NACK) can be returned to the target feedback terminal. It can be understood that when the first terminal receives at least two signals sent on the PSCCH and PSSCH from the second terminal in the same time window, at least two sidelink ACK/NACK information feedbacks are required, because the first terminal can transmit the number of feedbacks at the same time Therefore, in this embodiment, if the first terminal receives the PSCCH sent by at least two second terminals and the signal sent on the PSSCH in the same time window, it is based on receiving the PSCCH sent by at least two second terminals. And the signal sent on the PSSCH, or/and the transmission configuration between the first terminal and each of the two second terminals, the second terminal that needs to transmit feedback can be determined from at least two second terminals, thus reducing feedback conflicts At the same time, the rationality of determining at least one second terminal for feedback can be ensured.

In the embodiment of the present invention, when the transmission of multiple sidelink ACK/NACK information is prone to conflict, a suitable processing mechanism is needed. Through the HARQ feedback method of the embodiment of the present invention, a multi-sidelink ACK/NACK information is provided. Operation, you can determine the sidelinking of the PSSCH of at least one second terminal based on the received signals sent on the PSCCH and PSSCH of all second terminals, and/or the transmission configuration information of the first terminal and each second terminal HARQ ACK/NACK feedback can reduce the conflict of HARQ ACK/NACK feedback, thereby reducing the impact of conflict.

In an embodiment, the receiving the signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window includes: receiving the signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

In this embodiment, one time window includes one time slot, that is, the above-mentioned same time window includes one time slot, and the above-mentioned same time slot is one time slot included in the same time window. As shown in Figure 8. At least two signals sent on the PSCCH and PSSCH of the second terminal are received in the same time slot in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, then according to The signals sent on the PSCCH and PSSCH of all second terminals received in the same time slot, and/or the transmission configuration information of the first terminal and each second terminal, determine the sidelinking of the PSSCH of at least one second terminal HARQ ACK/NACK feedback.

For example, the signals sent on the PSCCH and PSSCH to 5 second terminals are received in the same time slot in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, if According to the signals sent on the PSCCH and PSSCH of all the second terminals received in the same time slot, and/or the transmission configuration information of the first terminal and each second terminal, the HARQ ACK for sidelinking the two second terminals is determined /NACK feedback, reduce feedback conflicts.

If the signals sent on the PSCCH and PSSCH of a second terminal are received in the same time slot, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, you can The PSSCH of the two terminals performs sidelink HARQ ACK/NACK feedback.

In an embodiment, according to the received signals sent on the PSCCH and PSSCH of all the second terminals, and/or the transmission configuration information of the first terminal and each second terminal, it is determined to perform the PSSCH of at least one second terminal. HARQ ACK/NACK feedback from sidelink includes: Determine, according to the first information, sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; The first information includes one or more of the following: The service characteristic of the data packet carried in the signal sent by the second terminal on the PSSCH, where the service characteristic includes at least priority order and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The magnitude of RSRP (Reference Signal Receiving Power, Reference Signal Receiving Power) of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal.

That is, the first terminal determines to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal according to one or more of the following information: The service characteristics of the data packet carried by the PSSCH sent by the second terminal, the service characteristics may include: QoS (Quality of Service, quality of service), priority, and delay information; Transmission configuration information of the first terminal and the second terminal; The number of PSSCH retransmissions sent by the second terminal; Whether the first terminal decodes the PSSCH sent by the second terminal correctly or not; it can be understood as the decoding result of the signal sent by the second terminal on the PSSCH by the first terminal. For example, the decoding result may be correct or incorrect.

The RSRP size of the PSSCH sent by the second terminal measured by the first terminal; The distance between the first terminal and the second terminal.

That is, in this embodiment, the service characteristics of the data packet carried by the signal sent by the second terminal on the PSSCH, the transmission configuration information of the first terminal and the second terminal, and the number of signal retransmissions sent by the second terminal on the PSSCH , Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly, the RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal, and the distance between the first terminal and the second terminal One or more items of size determine at least one second terminal that needs feedback from at least two second terminals, and then perform sidelink HARQ ACK/NACK feedback on the PSSCH of the at least one second terminal. That is, in the feedback process, one or more of the above-mentioned first information is considered. On the one hand, it can ensure that at least one second terminal can meet the requirements of the above-mentioned first information. On the other hand, it is no longer regardless of whether the second terminal and the The situation between the first terminals is fed back to all second terminals, but at least one second terminal determined based on the above-mentioned first information is fed back, which can reduce the occurrence of conflicts.

In an embodiment, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; among them, if the communication between the first terminal and the second terminal is sidelink For multicast communication, the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal only supports HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal supports HARQ ACK and HARQ NACK feedback.

That is, the transmission configuration information of the first terminal and the second terminal includes: Whether the communication between the first UE and the second UE is sidelink unicast communication or sidelink multicast communication. If it is sidelink multicast communication, the configuration information of the multicast communication mode includes the following configuration information of mode 1 or mode 2 Configuration information; Among them, mode 1: There is a need for clear group members to receive and control multicast communication, where the organization members are controlled by the front of the fleet, for example, the multicast communication of vehicles in formation; Mode 2: Similar to broadcast multicast communication, the UE judges whether it is a member of a group based on certain criteria, for example, based on distance, which belongs to a kind of multicast communication without admission control; And the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback, or to support HARQ ACK and HARQ NACK feedback.

That is, in this embodiment, the transmission configuration information may include whether the communication between the first terminal and the second terminal is sidelink unicast communication or sidelink multicast communication or/and the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal The configuration of is to only support HARQ NACK feedback, or to support HARQ ACK and HARQ NACK feedback. Through the above transmission configuration information, at least one second terminal that needs feedback can be more accurately determined from at least two second terminals. A second terminal performs sidelink HARQ ACK/NACK feedback to reduce the occurrence of conflicts.

In an embodiment, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; The geographic location information of the second terminal.

Among them, the service characteristics of the data packet carried in the PSSCH sent by the second terminal include information such as priority order and time delay.

The number of PSSCH retransmissions sent by the second terminal can be indicated in an explicit manner, or in a redundant version and/or NDI (New Data Indicator) implicitly, to determine how many times the current PSSCH is the PSSCH retransmission. pass.

The transmission configuration information of the first terminal and the second terminal is the transmission configuration instruction information of the first terminal and the second terminal.

The geographic location information of the second terminal, in consideration of reducing signaling consumption, may be rough geographic location information, such as truncated GPS coordinates or area identification.

That is to say, the signal sent on the PSCCH of the second terminal may include one or more of the above, and it may be determined based on the signal sent on the above PSCCH to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal, that is, in the feedback process, Taking into account the signal sent on the PSCCH of the second terminal, from the at least one second terminal that needs to be fed back accurately determined from the at least two second terminals, sidelink HARQ ACK/NACK feedback is performed on the PSSCH of the at least one second terminal, To reduce conflicts.

In an embodiment, determining to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal includes: According to the first criterion, determine to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; The first criterion includes one or more of the following: The PSSCH of the second terminal with a higher priority is given priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority.

If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority.

That is, according to the received PSCCH and PSSCH information of all second terminals, the first terminal determines to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal, which specifically includes one or more of the following criteria: : The PSSCH of the second terminal with a higher priority is given priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay, so as to avoid packet loss at the sender due to delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority, where the RSRP threshold of the PSSCH is pre-configured or network-configured; If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority, where the threshold of the distance is pre-configured or configured by the network.

For example, five second terminals send the signals sent on PSCCH and PSSCH to the first terminal, and the first terminal receives the signals sent on the PSCCH and PSSCH from the first terminal in the same time slot. The first criterion is to determine the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal. If among the five second terminals, the priority of the data packets carried by the signals sent on the PSSCH of the three second terminals is higher, for example, all are greater than the preset priority threshold, then at least one of the three second terminals can be The PSSCH of a second terminal performs sidelink HARQ ACK/NACK feedback.

For another example, based on the combination of the priority order and distance of the data packets carried on the signal sent on the PSCCH, if the priority order of the data packets carried on the signal sent on the PSCCH of each of the five second terminals is lower, For example, all are less than the preset priority order threshold, but one of the five second terminals is closer to the first terminal. For example, if the distance is all less than the preset distance threshold, the second terminal can be The PSSCH of the terminal performs sidelink HARQ ACK/NACK feedback.

For another example, through the combination of the priority order and time delay of the data packets carried on the signal sent on the PSCCH, if 3 of the 5 second terminals have the same priority order of the data packets carried on the signal sent on the PSCCH, And the priority is the highest. The sidelink HARQ ACK/NACK feedback can be performed on the PSSCH of the second terminal with the smaller delay among the three second terminals with the same priority order of the data packets carried on the signal sent on the PSCCH.

According to the above-mentioned first criterion, at least one second terminal can be determined from at least two second terminals, so that the determined at least one terminal can meet one or more requirements of priority, delay, RSRP, and distance, so that At least one second terminal that needs feedback is more adaptable to actual conditions, and when sidelink HARQ ACK/NACK feedback is subsequently performed on the PSSCH of at least one second terminal, collisions can be reduced.

In one embodiment, the first criterion further includes: There is sidelink unicast communication between the first terminal and all second terminals. The HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal. The PSSCH information of the second terminal that is correctly received is prioritized for HARQ ACK/ NACK feedback.

That is, the first terminal and all the second terminals are sidelink unicast communication, and the HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal, and the received signal sent on the PSSCH of the second terminal can be correct The decoded second terminal gives priority to HARQ ACK/NACK feedback. It can be understood that on the basis of the first criterion involving one or more of priority, delay, RSRP, and distance, the first criterion may optionally further include: the principle of HARQ ACK priority, and the correct reception of the second terminal The PSSCH is prioritized for HARQ ACK/NACK feedback. In this case, the first terminal has a similar function of feeding back HARQ NACK and not sending any HARQ ACK/NACK feedback information, both of which tell the second terminal that the PSSCH has not been received correctly. Therefore, the HARQ ACK information can be fed back to indicate that the second terminal does not need to retransmit the PSSCH, thereby further reducing the load on the system and reducing interference.

In one embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal only supports HARQ NACK feedback, and the PSSCH of the second terminal is the first transmission priority for HARQ NACK Give back.

There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured such that the first terminal only supports HARQ NACK feedback. The first terminal selects at least one PSSCH of the second terminal for HARQ ACK/NACK feedback.

That is, the first criterion may optionally further include that the signal sent on the PSSCH of the second terminal is the first transmission (that is, the first transmission) and the HARQ NACK feedback is given priority. In this way, the second terminal that initially transmits the signal sent on the PSSCH can give priority to feedback, and the rationality of the feedback can be improved.

In one embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal supports HARQ ACK and HARQ NACK feedback, and the PSSCH information of the second terminal that is correctly received is given priority. HARQ ACK/NACK feedback.

There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured such that the first terminal supports HARQ ACK and HARQ NACK feedback. The first terminal selects at least one PSSCH of the second terminal for HARQ ACK/NACK feedback. That is, the first criterion may optionally further include the principle of HARQ ACK priority, and HARQ ACK/NACK feedback is given priority to the PSSCH of the second terminal that is correctly received. That is, in the feedback process, not only the HARQ ACK priority is considered, but also whether the signal sent on the PSSCH of the received second terminal is correctly decoded. If it can be decoded correctly, the feedback is given priority to improve the rationality of the feedback.

In one embodiment, the first criterion further includes: There is multicast communication between the first terminal and all the second terminals. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as follows: the first terminal supports HARQ ACK and HARQ NACK feedback. The HARQ ACK/NACK feedback mode between the terminal and the second terminal of set 2 is configured so that the first terminal only supports HARQ NACK feedback, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 takes precedence over the sidelink of set 1. HARQ ACK/NACK feedback.

That is, there is multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as the first terminal to support HARQ ACK and HARQ NACK feedback. All the second terminals in 1 are terminals that support HARQ ACK and HARQ NACK feedback with the first terminal in a HARQ ACK/NACK feedback mode. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal in set 2 is configured such that the first terminal only supports HARQ NACK feedback, and all second terminals in set 2 are HARQ ACK/NACK between the first terminal and the first terminal. The NACK feedback method is a terminal that only supports HARQ NACK feedback. The first terminal selects at least one PSSCH of the second terminal for HARQ ACK/NACK feedback, that is, the first criterion optionally further includes: the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 is preferred to the sidelink of set 1 HARQ ACK/NACK feedback, that is, the second terminal that only supports HARQ NACK feedback with the first terminal has priority over the second terminal that supports HARQ ACK and HARQ NACK feedback with the first terminal. This ensures that only HARQ is supported The second terminal of the NACK feedback gives priority to the feedback to ensure the rationality of the feedback.

In one embodiment, the first criterion further includes: There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. The second terminal in set 4 that performs multicast communication preferentially performs sidelink HARQ ACK/ NACK feedback.

There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. That is, the first criterion may optionally include: the second terminal in the set 4 performing multicast communication gives priority to sidelink HARQ ACK/NACK feedback, which can ensure that the second terminal performing multicast communication is given priority to give feedback, making the feedback more reasonable. .

In one embodiment, the first criterion further includes: The first terminal and the second terminal in set 5 are in mode 1 multicast communication, and the second terminal in set 6 is in mode 6 multicast communication, and the PSSCH of the second terminal in mode 1 multicast communication is Give priority to sidelink HARQ ACK/NACK feedback.

That is, the mode 1 multicast communication is between the first UE and the second UE in the set 5, and the mode 6 multicast communication is between the first UE and the second UE in the set 2. That is, the first criterion may optionally include: Priority of sidelink HARQ ACK/NACK feedback is given to the PSSCH of the second UE in mode 1 multicast communication, which can ensure that the second terminal that performs multicast communication in mode 1 is given priority to give feedback, so that The feedback is more reasonable.

In an embodiment, determining the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal according to the first criterion includes: the first terminal determines the priority order of the at least two second terminals according to the first criterion; The priority sequence of at least two second terminals determines the priority sequence set of the second terminals that need to perform Sidelink ACK/NACK feedback; the first terminal determines the corresponding RSRP of the PSSCH of each second terminal in the priority sequence set The first terminal determines the corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determines the power required for PSFCH transmission; the first terminal determines the first terminal according to the order of the second terminal in the set of priority order The set of PSFCHs transmitted by the terminal is such that the sum of the total power determined for PSFCH transmission in the set of PSFCHs transmitted by the first terminal does not exceed the maximum transmission power of the first terminal.

Wherein, the upper limit of the number of second terminals in the set of priority order may be a value agreed upon by agreement, pre-configuration or network configuration.

That is, in the process of determining at least one second terminal that needs feedback from at least two second terminals, the total power required for transmission needs to be considered to ensure that the maximum transmission power of the first terminal can meet the requirements for transmitting HARQ ACK/NACK feedback. The required total power requirements ensure that the feedback can be performed normally and improve the stability of the feedback.

In an embodiment, the first terminal determines the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority order, including: Sort the second terminals in the set of priority order from high to low in order of priority, and the number of second terminals in the set of priority order is N, and N is a positive integer greater than or equal to 1; The set initialized by the first terminal for PSFCH transmission is S, and the initialized S set includes the terminal with the highest priority in the set of priority sequences; Initialize i=2; If the following first condition is met, put the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set; Perform the step of increasing i by 1 and returning if the following first condition is met, the PSFCH transmission of the terminal in the i-th position in the set of priority order is put into the S set, until i is greater than N, and the set S is obtained , The PSSCHs of all second terminals in the set S are the PSSCHs of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; The first condition is that the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal.

That is, as long as the sum of the total transmission power corresponding to set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal, it means that the first terminal still has more than or equal to the transmission pair at the i-th position. The transmission power required for the feedback of the terminal, that is, the PSFCH transmission of the terminal in the i-th position can be put into the S set until i is greater than N or the total transmission power corresponding to the set S is the same as the transmission of the terminal in the i-th position The sum of power is greater than the maximum transmission power of the first terminal. In this way, it can be ensured that the PSSCH in the PSFCH set can be transmitted normally.

In all the foregoing embodiments, it is optionally included that the number of second terminals selected by the first terminal for sidelink HARQ ACK/NACK feedback may be more than one. Determine whether to support the transmission of more than one PSFCH according to the power headroom of the first terminal, which is specifically as follows: After determining the set of the first terminal according to the priority order, the first terminal can estimate the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of the priority order to determine the power required for PSFCH transmission. The specific formula is as follows : PPSFCH,i = min(PSL_max, P0+a*PLSL,i).

Among them, PPSFCH,i is the power required for PSFCH transmission of terminal i in the set of priority order, and it represents the terminal i of the second terminal in the set of first terminal-to-priority order (that is, the terminal in the i-th position). ) The transmission power of the PSFCH channel for the HARQ ACK/NACK information transmission of the feedback, P0 is the target receiving sensitivity of the pre-configuration or network configuration, a is the path loss compensation factor, and PLSL,i is the terminal i and the first terminal in the second terminal. The path loss between a terminal, PSL_max is the maximum power transmitted by the terminal in the sidelink.

The first terminal determines the set of PSFCH transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that the total power of all determined PSFCH transmissions in the set does not exceed the maximum transmission of the first terminal power. The specific process is as follows: Suppose: the second terminal in the priority order set is sorted according to the priority order as terminal i, i=1, 2,..., N.

，當前集合S中已放入k個第二終端，

為當前集合S中k個第二終端對應的傳輸總功率； Step 2：重複step 1，直到i大於N，得到集合S，集合S中的所有第二終端的PSSCH即為第一終端確定進行sidelink的HARQ ACK/NACK回饋傳輸的第二終端的PSSCH。The first terminal determines that the set for PSFCH transmission is S, the S set initializes the terminal 1 containing the second terminal in the highest priority order in the priority order set, and the second terminal in the S set is indexed by k; Step 0: Initialize i=1; Step 1: If the following first condition is met, put the PSFCH transmission of terminal i into the S set, i=i+1. The first condition:

, K second terminals have been placed in the current set S,

Is the total transmission power corresponding to the k second terminals in the current set S; Step 2: Repeat step 1 until i is greater than N to obtain the set S. The PSSCHs of all second terminals in the set S are determined by the first terminal to perform sidelink The HARQ ACK/NACK for the PSSCH of the second terminal of the transmission.

The embodiment of the present invention provides a method when the first terminal needs to simultaneously transmit multiple sidelink ACK/NACK information, the first terminal selects at least one sidelink ACK/NACK feedback according to the selection criterion, thereby reducing conflicts.

Please refer to FIG. 13, which is a structural diagram of a first terminal according to an embodiment of the present invention. As shown in FIG. 13, a terminal 1300 includes: The receiving module 1301 is configured to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; The determining module 1302 is used to determine the PSSCH for at least one second terminal according to the received signals sent on the PSCCH and PSSCH of all the second terminals, and/or the transmission configuration information of the first terminal and each second terminal Perform sidelink HARQ ACK/NACK feedback.

In one embodiment, the above-mentioned same time window includes a time slot; The receiving module is used to receive the signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

In one embodiment, the determining module 1302 is configured to determine the HARQ ACK/NACK feedback for sidelinking the PSSCH of at least one second terminal according to the first information; The first information includes one or more of the following: The service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, where the service characteristics include at least priority and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal.

In an embodiment, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is The communication is sidelink multicast communication, then the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support the feedback of HARQ ACK and HARQ NACK .

In an embodiment, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; Geographic location information of the second terminal.

In an embodiment, the determining module is configured to determine, according to the first criterion, HARQ ACK/NACK feedback for sidelinking the PSSCH of at least one second terminal; The first criterion includes one or more of the following: The PSSCH of the second terminal with a higher priority is given priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority.

If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority.

In one embodiment, the first criterion further includes: There is sidelink unicast communication between the first terminal and all second terminals. The HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal. The PSSCH information of the second terminal that is correctly received is prioritized for HARQ ACK/ NACK feedback.

In one embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal only supports HARQ NACK feedback, and the PSSCH of the second terminal is the first transmission priority for HARQ NACK Give back.

In one embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal supports HARQ ACK and HARQ NACK feedback, and the PSSCH information of the second terminal that is correctly received is given priority. HARQ ACK/NACK feedback.

In one embodiment, the first criterion further includes: There is multicast communication between the first terminal and all the second terminals. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as follows: the first terminal supports HARQ ACK and HARQ NACK feedback. The HARQ ACK/NACK feedback mode between the terminal and the second terminal of set 2 is configured so that the first terminal only supports HARQ NACK feedback, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 takes precedence over the sidelink of set 1. HARQ ACK/NACK feedback.

In one embodiment, the first criterion further includes: There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. The second terminal in set 4 that performs multicast communication preferentially performs sidelink HARQ ACK/ NACK feedback.

In one embodiment, the first criterion further includes: The first terminal and the second terminal in set 5 are in mode 1 multicast communication, and the second terminal in set 6 is in mode 6 multicast communication, and the PSSCH of the second terminal in mode 1 multicast communication is Give priority to sidelink HARQ ACK/NACK feedback.

In one embodiment, the determining module includes: A priority order determining module, configured to determine the priority order of the at least two second terminals according to the first criterion; The first set determining module is configured to determine, according to the priorities of the at least two second terminals, a set of priorities of second terminals that need to perform Sidelink ACK/NACK feedback; A loss determining module, configured to determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority sequences; The power determination module is configured to determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determine the power required for PSFCH transmission; The second set determining module is used to determine the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that all determinations in the set of PSFCHs transmitted by the first terminal are performed The sum of the total power sent by the PSFCH does not exceed the maximum transmission power of the first terminal.

In one embodiment, the second set determination module is configured to include: The sorting module is used to sort the second terminals in the set of priority order from high to low in order of priority. The number of second terminals in the set of priority order is N, and N is a positive value greater than or equal to 1. Integer The first initialization module is used to initialize the set for PSFCH transmission to be S, and the initialized S set includes the terminal with the highest priority in the set of priority orders; The second initialization module is used to initialize i=2; Putting in a module for putting the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set if the following first condition is met; The target determination module is used to perform the step of increasing i by 1 and returning to the step of putting the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set if the following first condition is met, until If i is greater than N, a set S is obtained, and the PSSCHs of all second terminals in the set S are the PSSCHs of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; The first condition is that the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal.

Please refer to FIG. 14, which is a structural diagram of another first terminal provided by an embodiment of the present invention. As shown in FIG. 14, the first terminal includes: a transceiver 1410, a memory 1420, a processor 1430, and Programs on the memory 1420 that can be run on the processor 1430, of which: The transceiver 1410 is configured to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; The processor 14300 is configured to determine, according to the received signals sent on the PSCCH and PSSCH of all the second terminals, and/or the transmission configuration information of the first terminal and each second terminal, to determine the PSSCH of at least one second terminal HARQ ACK/NACK feedback from sidelink.

Among them, the transceiver 1410 can be used to receive and send data under the control of the processor 1430.

The bus architecture may include any number of interconnected bus bars and bridges, specifically one or more processors represented by the processor 1430 and various circuits of the memory represented by the memory 1420 are connected together. The bus bar architecture can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits. These are all known in the art. Therefore, the present invention will not further describe them. The bus interface provides an interface. The transceiver 1410 may be a plurality of elements, that is, including a transmitter and a receiver, and provide a unit for communicating with various other devices on the transmission medium.

The processor 1430 is responsible for managing the bus architecture and general processing, and the memory 1420 can store data used by the processor 1430 when performing operations.

It should be noted that the memory 1420 is not limited to the terminal, and the memory 1420 and the processor 1430 can be separated in different geographic locations.

In one embodiment, the above-mentioned same time window includes a time slot; The transceiver is used to receive the signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot.

In an embodiment, the processor is configured to determine, according to the first information, the HARQ ACK/NACK feedback for sidelinking the PSSCH of at least one second terminal; The first information includes one or more of the following: The service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, where the service characteristics include at least priority and/or time delay; Transmission configuration information of the first terminal and the second terminal; The number of signal retransmissions sent by the second terminal on the PSSCH; Whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; The RSRP size of the signal sent by the second terminal on the PSSCH measured by the first terminal; The distance between the first terminal and the second terminal.

In an embodiment, the transmission configuration information of the first terminal and the second terminal includes: The communication between the first terminal and the second terminal is sidelink unicast communication or the communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is The communication is sidelink multicast communication, then the configuration information of the sidelink multicast communication mode includes the configuration information of mode 1 or the configuration information of mode 2; The configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support the feedback of HARQ ACK and HARQ NACK .

In an embodiment, the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried in the signal sent by the second terminal on the PSSCH; The time delay of the data packet carried in the signal sent by the second terminal on the PSSCH; Transmission configuration information of the signal sent by the second terminal on the PSSCH; The number of signal retransmissions sent by the second terminal on the PSSCH; The first terminal and the second terminal transmit configuration instructions; Geographic location information of the second terminal.

In one embodiment, the processor 1430 is configured to determine, according to the first criterion, to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; The first criterion includes one or more of the following: The PSSCH of the second terminal with higher priority gives priority to HARQ ACK/NACK feedback; For PSSCH between second terminals with the same priority order, HARQ ACK/NACK feedback is given priority with a small delay; If the received RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority.

If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority.

In an embodiment, the first criterion further includes: There is sidelink unicast communication between the first terminal and all second terminals. The HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminal. The PSSCH information of the second terminal that is correctly received is prioritized for HARQ ACK/ NACK feedback.

In an embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal only supports HARQ NACK feedback, and the PSSCH of the second terminal is the first transmission priority for HARQ NACK Give back.

In an embodiment, the first criterion further includes: There is sidelink multicast communication between the first terminal and all second terminals, and the HARQ ACK/NACK feedback mode is configured so that the first terminal supports HARQ ACK and HARQ NACK feedback, and the PSSCH information of the second terminal that is correctly received is given priority. HARQ ACK/NACK feedback.

In an embodiment, the first criterion further includes: There is multicast communication between the first terminal and all the second terminals. The HARQ ACK/NACK feedback mode between the first terminal and the second terminal of set 1 is configured as follows: the first terminal supports HARQ ACK and HARQ NACK feedback. The HARQ ACK/NACK feedback mode between the terminal and the second terminal of set 2 is configured so that the first terminal only supports HARQ NACK feedback, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of set 2 takes precedence over the sidelink of set 1. HARQ ACK/NACK feedback.

In an embodiment, the first criterion further includes: There is unicast communication between the first terminal and the second terminal in set 3, and multicast communication with the second terminal in set 4. The second terminal in set 4 that performs multicast communication preferentially performs sidelink HARQ ACK/ NACK feedback.

In an embodiment, the first criterion further includes: The first terminal and the second terminal in set 5 are in mode 1 multicast communication, and the second terminal in set 6 is in mode 6 multicast communication, and the PSSCH of the second terminal in mode 1 multicast communication is Give priority to sidelink HARQ ACK/NACK feedback.

In one embodiment, the processor 1430 is used for Determine the priority order of the at least two second terminals according to the first criterion; Determine, according to the priority sequence of the at least two second terminals, a set of priority sequences of second terminals that need to perform Sidelink ACK/NACK feedback; Determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority order; Determine the corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determine the power required for PSFCH transmission; Determine the set of PSFCH transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that the sum of the total power determined to perform PSFCH transmission in the set of PSFCH transmitted by the first terminal does not exceed Maximum transmission power of the first terminal.

In one embodiment, the processor 1430 is configured to Sort the second terminals in the set of priority order from high to low in order of priority, and the number of second terminals in the set of priority order is N, and N is a positive integer greater than or equal to 1; The set for initializing PSFCH transmission is S, and the initialized S set includes the terminal with the highest priority in the set of priority order; Initialize i=2; If the following first condition is met, put the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set; Perform the step of increasing i by 1 and returning if the following first condition is met, the PSFCH transmission of the terminal in the i-th position in the set of priority order is put into the S set, until i is greater than N, and the set S is obtained , The PSSCHs of all second terminals in the set S are the PSSCHs of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; The first condition is that the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position is less than or equal to the maximum transmission power of the first terminal.

An embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored, wherein the program is executed by a processor to implement the steps in the HARQ feedback method provided by the embodiment of the present invention.

In the several embodiments provided by the present invention, it should be understood that the disclosed method and device can be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or elements can be combined or integrated. To another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

In addition, the functional units in each embodiment of the present invention may be integrated into one processing unit, or each unit may be included in a separate entity, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be realized either in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above-mentioned software function unit is stored in a storage medium and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the processing method of the information data block in the various embodiments of the present invention. Part of the steps. The aforementioned storage media include: USB disks, mobile hard disks, Read-Only Memory (Read-Only Memory, ROM for short), Random Access Memory (RAM for short), magnetic disks or optical disks, etc. The medium of the code.

It can be understood that the embodiments described in the present invention can be implemented by hardware, software, firmware, intermediary software, microprograms, or a combination thereof. For hardware implementation, each module, unit, sub-unit or sub-module can be implemented in one or more dedicated integrated circuits (Application Specific Integrated Circuit, ASIC), Digital Signal Processor (DSP), Digital signal processing equipment (DSP Device, DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), general-purpose processor, controller, microcontroller , A microprocessor, other electronic units for performing the functions described in the present invention, or a combination thereof.

For software implementation, the technology described in the embodiments of the present invention can be implemented through modules (for example, procedures, functions, etc.) that execute the functions described in the embodiments of the present invention. The software code can be stored in the memory and executed by the processor. The memory can be implemented in the processor or external to the processor.

The above are only the preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention. Any modification or equivalent replacement of the present invention without departing from the spirit and scope of the present invention shall be covered by the scope of the patent application for the present invention. In the range.

1300: terminal 1301: receiving module 1302: Determine the module 1410: Transceiver 1420: memory 1430: processor 501-502: steps

Figure 1 is a schematic diagram of a network structure applicable to an embodiment of the present invention; Figure 2 is a schematic diagram of resource selection provided by an embodiment of the present invention; Figure 3 is a schematic diagram of another resource selection provided by an embodiment of the present invention; Figure 4 is a diagram of a channel structure provided by an embodiment of the present invention; FIG. 5 is a flowchart of a HARQ feedback method provided by an embodiment of the present invention; FIG. 6 is one of the schematic diagrams of the time window provided by the embodiment of the present invention; FIG. 7 is a second schematic diagram of a time window provided by an embodiment of the present invention; FIG. 8 is a third schematic diagram of a time window provided by an embodiment of the present invention; FIG. 9 is a fourth schematic diagram of a time window provided by an embodiment of the present invention; FIG. 10 is a fifth schematic diagram of a time window provided by an embodiment of the present invention; FIG. 11 is a sixth schematic diagram of a time window provided by an embodiment of the present invention; Figure 12 is a seventh schematic diagram of a time window provided by an embodiment of the present invention; FIG. 13 is a structural diagram of a first terminal according to an embodiment of the present invention; FIG. 14 is a structural diagram of another first terminal provided by an embodiment of the present invention.

501-502: steps

Claims (15)

A HARQ feedback method, applied to a first terminal, includes: receiving signals sent on the PSCCH and PSSCH of at least two second terminals in the same time window, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal, determine the response to at least one second terminal PSSCH for sidelink HARQ ACK/NACK feedback; wherein, according to the received signals sent on the PSCCH and PSSCH of the at least two second terminals, and/or the transmission configuration information of the first terminal and each second terminal, Determining sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal includes: determining, according to the first information, sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; the first information includes one of the following or Multiple items: service characteristics of the data packets carried in the signal sent by the second terminal on the PSSCH, the service characteristics including at least priority and/or delay; transmission configuration information of the first terminal and the second terminal; the second terminal The number of retransmissions of the signal sent on the PSSCH; whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; the RSRP of the signal sent by the second terminal on the PSSCH measured by the first terminal The size of the distance between the first terminal and the second terminal. According to the HARQ feedback method described in item 1 of the scope of patent application, the same time window includes one time slot; the receiving signals transmitted on the PSCCH and PSSCH of at least two second terminals in the same time window includes: The time slot receives the signals sent on the PSCCH and PSSCH of at least two second terminals. The HARQ feedback method described in item 1 or 2 of the scope of patent application, wherein the transmission configuration information of the first terminal and the second terminal includes: the communication between the first terminal and the second terminal is sidelink unicast communication or The communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is sidelink multicast communication, the configuration information of the sidelink multicast communication mode includes Mode 1 configuration information or Mode 2 configuration information; the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the sidelink HARQ ACK/NACK of the first terminal and the second terminal The feedback configuration is to support HARQ ACK and HARQ NACK feedback. The HARQ feedback method described in item 1 or 2 of the scope of the patent application, wherein the PSCCH signal of the second terminal includes one or more of the following: the priority order of the data packets carried by the signal sent by the second terminal on the PSSCH ； The time delay of the data packet carried by the signal sent by the second terminal on the PSSCH; the transmission configuration information of the signal sent by the second terminal on the PSSCH; the number of retransmissions of the signal sent by the second terminal on the PSSCH; the first The terminal and the second terminal transmit configuration instructions; the geographic location information of the second terminal. The HARQ feedback method described in item 1 or 2 of the scope of the patent application, wherein determining the sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal includes: determining to at least one second terminal according to the first criterion PSSCH for sidelink HARQ ACK/NACK feedback; the first criterion includes one or more of the following: the PSSCH of the second terminal with higher priority has priority for HARQ ACK/NACK feedback; the PSSCH between second terminals with the same priority If the time delay is small, HARQ ACK/NACK feedback is given priority; if the RSRP of the received second terminal's PSSCH is higher than the threshold, HARQ ACK/NACK feedback is given priority. If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority. According to the HARQ feedback method described in item 5 of the scope of patent application, the determination of sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal according to the first criterion includes: The first terminal determines the priority order of the at least two second terminals according to the first criterion; determines the priority order set of the second terminals that need to perform Sidelink ACK/NACK feedback according to the priority order of the at least two second terminals; The first terminal determines the corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority order; the first terminal determines the corresponding path loss according to the RSRP of the PSSCH of each second terminal, Determine the power required for PSFCH transmission; the first terminal determines the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority order, so that all the PSFCHs in the set of PSFCHs transmitted by the first terminal It is determined that the total power of PSFCH transmission does not exceed the maximum transmission power of the first terminal. For example, the HARQ feedback method described in item 6 of the scope of patent application, wherein the first terminal determines the set of PSFCH transmitted by the first terminal according to the order of the second terminal in the set of priority order, including: The second terminal in the set of priority order is sorted in the order of priority from high to low. The number of second terminals in the set of priority order is N, and N is a positive integer greater than or equal to 1; the initialization of the first terminal is performed The set of PSFCH transmission is S. The initialized set of S contains the terminal with the highest priority in the set of priority order; initialize i=2; if the following first condition is met, the set of priority order will be ranked The PSFCH transmission of the terminal at the i-th position is put into the S set; Perform the step of increasing i by 1 and returning if the following first condition is met, the PSFCH transmission of the terminal in the i-th position in the set of priority order is put into the S set, until i is greater than N, and the set S is obtained , The PSSCH of all second terminals in the set S is the PSSCH of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; where the first condition is that the total transmission power corresponding to the set S is The sum of the transmission power of the terminal at position i is less than or equal to the maximum transmission power of the first terminal. A first terminal includes: a transceiver, a memory, a processor, and a program stored on the memory and running on the processor, wherein the transceiver is used to receive at least 2 The signal sent on the PSCCH and PSSCH of the two terminals, and the transmission of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback; the processor is configured to receive the at least two second The signals sent on the PSCCH and PSSCH of the terminal, and/or the transmission configuration information of the first terminal and each second terminal, determine to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; wherein, the processor , Used to determine the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal according to the first information; the first information includes one or more of the following: Service characteristics, the service characteristics include at least priority order and/or time delay; transmission configuration information of the first terminal and the second terminal; The number of retransmissions of the signal sent by the second terminal on the PSSCH; whether the first terminal decodes the signal sent by the second terminal on the PSSCH correctly; whether the first terminal measures the signal sent by the second terminal on the PSSCH The size of the RSRP; the distance between the first terminal and the second terminal. The first terminal described in item 8 of the scope of patent application, wherein the same time window includes a time slot; the transceiver is used to receive signals sent on the PSCCH and PSSCH of at least two second terminals in the same time slot . For example, the first terminal described in item 8 or 9 of the scope of patent application, wherein the transmission configuration information of the first terminal and the second terminal includes: the communication between the first terminal and the second terminal is sidelink unicast communication or The communication between the first terminal and the second terminal is sidelink multicast communication; wherein, if the communication between the first terminal and the second terminal is sidelink multicast communication, the configuration information of the sidelink multicast communication mode includes Mode 1 configuration information or Mode 2 configuration information; the configuration of the sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal is to support only HARQ NACK feedback or the sidelink HARQ ACK/NACK of the first terminal and the second terminal The feedback configuration is to support HARQ ACK and HARQ NACK feedback. For example, the first terminal described in item 8 or 9 of the scope of patent application, wherein the PSCCH signal of the second terminal includes one or more of the following: The priority order of the data packets carried by the signal sent by the second terminal on the PSSCH; the delay of the data packets carried by the signal sent by the second terminal on the PSSCH; the transmission configuration information of the signal sent by the second terminal on the PSSCH ; The number of signal retransmissions sent by the second terminal on the PSSCH; the transmission configuration instructions of the first terminal and the second terminal; the geographic location information of the second terminal. For the first terminal described in item 8 or 9 of the scope of patent application, wherein the processor is configured to determine, according to the first criterion, to perform sidelink HARQ ACK/NACK feedback on the PSSCH of at least one second terminal; the first criterion includes the following One or more: the PSSCH of the second terminal with the higher priority order will give priority to HARQ ACK/NACK feedback; the PSSCH between the second terminal of the same order of priority will give priority to HARQ ACK/NACK feedback; If the RSRP of the PSSCH of the second terminal is higher than the threshold, HARQ ACK/NACK feedback is given priority. If the distance between the first terminal and the second terminal is less than the threshold, HARQ ACK/NACK feedback is given priority. For example, the first terminal described in item 12 of the scope of patent application, wherein the processor is configured to determine the priority order of the at least two second terminals according to the first criterion; and determine the priority order of the at least two second terminals Sidelink is required The set of priority order of the second terminal for ACK/NACK feedback; the corresponding path loss is determined according to the RSRP of the PSSCH of each second terminal in the set of priority order; the corresponding path loss is determined according to the PSSCH of each second terminal RSRP determines the corresponding path loss and determines the power required for PSFCH transmission; according to the order of the second terminal in the set of priority order, determines the set of PSFCHs transmitted by the first terminal, so that the set of PSFCHs transmitted by the first terminal The sum of the total power of all the determined PSFCH transmissions does not exceed the maximum transmission power of the first terminal. For example, the first terminal described in item 13 of the scope of the patent application, wherein the processor is configured to sort the second terminal in the set of priority order from high to low in order of priority, and in the set of priority order The number of second terminals is N, and N is a positive integer greater than or equal to 1; the initial set for PSFCH transmission is S, and the initialized S set contains the terminal with the highest priority in the set of priority orders; initial i= 2; If the following first condition is met, put the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set; execute to increase i by 1, and return if the following first condition is met, then The step of putting the PSFCH transmission of the terminal in the i-th position in the set of priority order into the S set until i is greater than N, and the set S is obtained. The PSSCH of the second terminal is the PSSCH of the second terminal that the first terminal determines to perform sidelink HARQ ACK/NACK feedback; where the first condition is the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the i-th position Less than or equal to the maximum transmission power of the first terminal. A computer-readable storage medium with a program stored on the computer-readable storage medium, when the program is executed by a processor, realizes the steps of the HARQ feedback method as described in any one of items 1 to 7 of the scope of patent application.

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