CN111866800B

CN111866800B - HARQ feedback method, first terminal and computer readable storage medium

Info

Publication number: CN111866800B
Application number: CN201910579074.8A
Authority: CN
Inventors: 赵锐; 任晓涛; 郑石磊; 马腾
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-04-30
Filing date: 2019-06-28
Publication date: 2021-11-05
Anticipated expiration: 2039-06-28
Also published as: WO2020221206A1; TW202044859A; TWI749538B; CN111866800A

Abstract

The embodiment of the invention provides a HARQ feedback method, a first terminal and a computer readable storage medium, wherein the method comprises the following steps: receiving information carried by PSCCH and PSSCH of at least 2 second terminals in the same time window, and configuring transmission of the first terminal and each second terminal to need sidelink HARQ ACK/NACK feedback; and determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback according to the received information carried by the PSCCHs and PSSCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal. The embodiment of the invention can reduce feedback conflict.

Description

HARQ feedback method, first terminal and computer readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a HARQ feedback method, a first terminal, and a computer-readable storage medium.

Background

In a 5G New Radio (NR) system, a larger bandwidth, a higher throughput, a more complex service, and a more complex processing technique matched thereto are supported. With the further development of the car networking technology, new application scenarios appear, such as vehicle formation, advanced driving, sensor information sharing, remote control and the like. These application scenarios require broadcast, multicast and unicast communication to be provided over sidelink (link for direct communication between terminals (UE)). These application scenarios put higher demands on sidelink between UEs, and require larger data packets to be carried, higher transmission reliability, and longer transmission distance.

In the design of NR V2X (vehicle to X), HARQ (hybrid automatic repeat request) feedback is used as an effective means for improving the reliability of data transmission in order to meet the above requirements, and a mechanism of HARQ feedback is introduced in the unicast and multicast communication system of sidelink to improve the transmission reliability. However, in the NR V2X sidelink communication, one UE needs to perform unicast communication with a plurality of UEs at the same time, or one UE needs to perform both unicast and multicast communication. In this case, it may happen that one UE needs to perform sidelink ACK (acknowledgement)/NACK (Non-acknowledgement) feedback to multiple UEs at the same time. However, multiple sidelink ACK/NACK feedbacks are prone to collision.

Disclosure of Invention

Embodiments of the present invention provide an HARQ feedback method, a first terminal, and a computer-readable storage medium, so as to solve a problem that a collision is likely to occur in a feedback process.

The embodiment of the invention provides a HARQ feedback method, which is applied to a first terminal and comprises the following steps:

receiving information carried by a PSCCH (Physical downlink Control Channel) and a PSSCH (Physical downlink shared Channel) of at least 2 second terminals in the same time window, wherein the PSCCH is used for carrying scheduling signaling of the associated PSSCH, and the PSSCH are used for carrying data packets of services;

and determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback according to the received information carried by the PSCCHs and PSSCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal.

Optionally, the same time window includes one time slot;

the receiving of the PSCCH and PSCCH-carried information of at least 2 second terminals in the same time window includes:

receiving information carried by the PSCCH and PSSCH of at least 2 second terminals in the same time slot.

Optionally, determining that the sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and PSCCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal, includes:

determining that the HARQ ACK/NACK feedback of sidelink is carried out on at least one second terminal PSSCH according to the first information;

the first information comprises one or more of:

the service characteristics of a data packet carried by PSSCH carried information sent by the second terminal at least comprise priority and/or time delay;

the transmission configuration information of the first terminal and the second terminal;

the PSSCH transmitted by the second terminal carries the information retransmission times;

the first terminal judges whether the PSSCH information sent by the second terminal is decoded correctly or not;

the first terminal measures the RSRP of the information carried by the PSSCH sent by the second terminal;

the distance between the first terminal and the second terminal is large or small.

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; if the communication between the first terminal and the second terminal is sidelink multicast communication, the configuration information of the mode of the sidelink multicast communication comprises the configuration information of the mode 1 or the configuration information of the mode 2;

the configuration of the sidelink HARQ ACK/NACK feedback of the first and second terminals is to support HARQ NACK feedback only or the configuration of the sidelink HARQ ACK/NACK feedback of the first and second terminals is to support HARQ ACK and HARQ NACK feedback.

Optionally, the PSCCH information of the second terminal includes one or more of the following items:

the priority of a data packet carried by PSSCH carried information sent by the second terminal;

time delay of a data packet carried by PSSCH carried information sent by the second terminal;

the transmission configuration information of the PSSCH carried information sent by the second terminal;

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

Optionally, determining to perform sidelink HARQ ACK/NACK feedback on the pscch of the at least one second terminal includes:

according to a first criterion, determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback;

the first criterion includes one or more of:

the PSSCH of the second terminal with high priority preferentially carries out HARQ ACK/NACK feedback;

the PSSCH between the second terminals with the same priority carries out HARQ ACK/NACK feedback with small time delay preferentially;

and the received RSRP of the PSSCH of the second terminal is higher than the threshold, and HARQ ACK/NACK feedback is performed preferentially.

And the distance between the first terminal and the second terminal is smaller than the threshold, and HARQ ACK/NACK feedback is preferentially carried out.

Optionally, the first criterion further includes:

and the first terminal and all the second terminals are in sidelink unicast communication, HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminals, and HARQ ACK/NACK feedback is preferentially carried out on the correctly received PSSCH information of the second terminals.

Optionally, the first criterion further includes:

the first terminal and all the second terminals are in sidelink multicast communication, the HARQ ACK/NACK feedback mode is configured in such a way that the first terminal only supports the feedback of HARQ NACK, and the PSSCH of the second terminal is the feedback of the HARQ NACK which is transmitted initially and is preferentially carried out.

Optionally, the first criterion further includes:

the first terminal and all the second terminals are in sidelink multicast communication, and the HARQ ACK/NACK feedback mode is configured in such a way that the first terminal supports the feedback of HARQ ACK and HARQ NACK, and the correctly received PSSCH information of the second terminal is preferentially subjected to HARQ ACK/NACK feedback.

Optionally, the first criterion further includes:

multicast communication is carried out between the first terminal and all the second terminals, the HARQ ACK/NACK feedback mode between the first terminal and the second terminals of the set 1 is configured to enable the first terminal to support the feedback of HARQ ACK and HARQ NACK, the HARQ ACK/NACK feedback mode between the first terminal and the second terminals of the set 2 is configured to enable the first terminal to only support the feedback of HARQ NACK, and the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal of the set 2 is prior to the sidelink HARQ ACK/NACK feedback in the set 1.

Optionally, the first criterion further includes:

unicast communication is carried out between the first terminal and the second terminal in the set 3, multicast communication is carried out between the first terminal and the second terminal in the set 4, and the second terminal in the set 4 carrying out multicast communication preferentially carries out sidelink HARQ ACK/NACK feedback.

Optionally, the first criterion further includes:

mode 1 multicast communication is performed between the first terminal and the second terminal in the set 5, mode 6 multicast communication is performed between the first terminal and the second terminal in the set 6, and sidelink HARQ ACK/NACK feedback is performed preferentially on PSSCH of the second terminal in the mode 1 multicast communication.

Optionally, the determining, according to the first criterion, that the sidelink HARQ ACK/NACK feedback is performed on the psch of the at least one second terminal includes:

the first terminal determines the priority of the at least two second terminals according to a first criterion;

determining a set of priority orders of the second terminals needing to perform Silelink ACK/NACK feedback according to the priorities of the at least two second terminals;

the first terminal determines a corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority orders;

the first terminal determines corresponding path loss according to the RSRP of the PSSCH of each second terminal and determines the power required by PSFCH transmission;

and 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 orders, so that the sum of the total power of all PSFCHs transmitted by the first terminal in the set of PSFCHs transmitted by the first terminal does not exceed the maximum transmission power of the first terminal.

Optionally, the determining, by the first terminal, the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority orders includes:

sorting the second terminals in the set of the priority order according to the priority from high to low, wherein the number of the second terminals in the set of the priority order is N, and N is a positive integer greater than or equal to 1;

the set of the first terminal initializing and performing PSFCH transmission is S, and the initialized S set comprises the terminal with the highest priority in the set of the priority sequence;

initializing i-2;

putting PSFCH transmission of a terminal ranked at the ith position in the set of priority orders into an S set if a first condition that the PSFCH transmission of the terminal ranked at the ith position in the set of priority orders is met;

executing the step of increasing i by 1 and putting the PSFCH transmission of the terminal at the ith position in the set of the priority order into the set S if the following first condition is met, until i is greater than N, obtaining a set S, and determining PSSCHs of all second terminals in the set S as PSSCHs of the second terminals which perform the HARQ ACK/NACK feedback of sidelink for the first terminal;

and the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the ith position is less than or equal to the maximum transmission power of the first terminal.

An embodiment of the present invention further provides a first terminal, including:

a receiving module, configured to receive information carried by PSCCH and PSCCH of at least 2 second terminals in a same time window, where transmission configuration of the first terminal and each second terminal is to need sidelink HARQ ACK/NACK feedback;

and the determining module is used for determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback according to the received information carried by the PSCCHs and the PSSCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal.

Optionally, the same time window includes one time slot;

and the receiving module is used for receiving the information carried by the PSCCH and the PSSCH of at least 2 second terminals in the same time slot.

Optionally, the determining module is configured to determine that sidelink HARQ ACK/NACK feedback is performed on at least one second terminal psch according to the first information;

the first information comprises one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

An embodiment of the present invention further provides a first terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is configured to receive information carried by PSCCH and PSCCH of at least 2 second terminals in the same time window, and the transmission configuration of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback;

the processor is configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and the PSCCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal.

Optionally, the same time window includes one time slot;

the transceiver is configured to receive information carried by the PSCCH and the PSCCH of at least 2 second terminals in the same timeslot.

Optionally, the processor is configured to determine that sidelink HARQ ACK/NACK feedback is performed on at least one second terminal psch according to the first information;

the first information comprises one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

Optionally, the processor 1100 is configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSSCH of the at least one second terminal according to a first criterion;

the first criterion includes one or more of:

Optionally, the first criterion further includes:

Optionally, the processor is used for

Determining the priorities of the at least two second terminals according to a first criterion;

determining a corresponding path loss according to the RSRP of the PSSCH of each second terminal in the set of priority orders;

determining corresponding path loss according to the RSRP of the PSSCH of each second terminal, and determining power required by PSFCH transmission;

and determining the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority orders, so that the sum of the total power of all PSFCH transmissions determined in the set of PSFCHs transmitted by the first terminal does not exceed the maximum transmission power of the first terminal.

Optionally, a processor for

initializing a set for PSFCH transmission as S, wherein the initialized set S comprises the terminal with the highest priority in the set of the priority sequence;

initializing i-2;

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the HARQ feedback method provided in the embodiment of the present invention are implemented.

In the embodiment of the invention, the HARQ ACK/NACK feedback of sidelink to the PSSCH of at least one second terminal can be determined according to the received information carried by the PSCCHs and PSSCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal, so that the conflict of the HARQ ACK/NACK feedback can be reduced, and the influence brought by the conflict can be reduced.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

FIG. 2 is a schematic diagram of a resource selection provided by an embodiment of the present invention;

FIG. 3 is another schematic diagram of resource selection provided by an embodiment of the invention;

fig. 4 is a channel structure diagram provided in an embodiment of the present invention;

fig. 5 is a flowchart of a HARQ feedback method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a time window provided by an embodiment of the present invention;

FIG. 7 is a second schematic diagram of a time window provided in 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 exemplary time window diagram according to the present invention;

FIG. 11 is a sixth schematic diagram of a time window provided in accordance with an embodiment of the present invention;

FIG. 12 is a seventh schematic diagram of a time window provided by 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 block diagram of another first terminal according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which an embodiment of the present invention is applicable, and includes a first terminal and a second terminal, where, as shown in fig. 1, the second terminal includes a terminal UE1 and a terminal UE2, and the first terminal is a terminal UE 3. The first terminal and the second terminal may be User Equipment (UE) or other terminal devices, for example: a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like. 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.

The method for allocating NR Sidelink resources comprises the following steps: as shown in fig. 2 and 3, in NR V2X, there are two types of resource selection approaches on sidelink:

the first type is a Base Station (BS) assisted resource selection approach, which can schedule V2X communications through a cell in the case of a vehicle within network coverage, as shown in fig. 2 in particular. In this case, the base station transmits scheduling information (V2X scheduling grant information) to the V2X terminal, indicating information such as the resource location transmitted by the V2X terminal, and SL in fig. 2 indicates sidelink.

The second type is a manner in which the UE autonomously selects resources, as shown in fig. 3, where the UE obtains the position of an idle resource in a configured or preconfigured resource pool by a sensing method, and then selects a resource transmitted by the UE from the idle resource.

The way of Sidelink ACK/NACK feedback is as follows:

in the design of NR V2X, only the operation of sidelink HARQ feedback in the case of sidelink unicast and multicast communication is considered. Wherein the time interval between the PSFCH and the associated PSSCH for further explicit HARQ feedback is network configured or pre-configured.

For the unicast communication of the sidelink, if the receiving UE correctly decodes the received sidelink data packet which sends the UE, the ACK information is fed back; and if the receiving UE fails to correctly decode the received sidelink data packet of the sending UE, feeding back NACK information.

For sidelink multicast communication, HARQ feedback on sidelink has the following two modes:

mode 1: in this method, the receiving UE only supports NACK feedback, and if the receiving UE fails to correctly decode the received sidelink data packet of the transmitting UE, NACK information is fed back. If the receiving UE correctly decodes the received sidelink data packet of the sending UE, no information is fed back.

Mode 2: receiving feedback that the UE supports ACK and NACK, and feeding back ACK information if the receiving UE correctly decodes the received sidelink data packet which sends the UE; and if the receiving UE fails to correctly decode the received sidelink data packet of the sending UE, feeding back NACK information.

In the two sidelink HARQ feedback manners of sidelink multicast communication, manner 1 is intended to share one sidelink ACK/NACK channel resource for all receiving UEs, and manner 2 is intended to have independent ACK/NACK feedback resource for all receiving UEs. For the unicast communication scheme, scheme 2 is adopted for feedback.

The PSFCH (physical Sidelink Feedback channel) is used for carrying Sidelink HARQ ACK/NACK information, and in the PSFCH design of NR V2X, a TDM multiplexing mode between the PSSCH/PSCCH and the PSFCH is explicitly supported at present, and a schematic diagram thereof is shown in fig. 4. The PSFCH typically occupies the last few OFDM symbols of a slot (slot).

Referring to fig. 5, fig. 5 is a flowchart of a HARQ feedback method according to an embodiment of the present invention, which can be applied to a first terminal, and as shown in fig. 5, the method includes the following steps:

501: receiving information carried by PSCCH and PSSCH of at least 2 second terminals in the same time window, and configuring the transmission of the first terminal and each second terminal to need sidelink HARQ ACK/NACK feedback.

502: and determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback according to the received information carried by the PSCCHs and PSSCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal.

The first terminal may receive information carried by the PSCCH and the PSCCH of the second terminal, and in the HARQ feedback process of this embodiment, when information carried by the PSCCH and the PSCCH of at least 2 second terminals is received within the same time window and transmission configuration of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, at least one second terminal may be determined from the at least 2 second terminals and sidelink HARQ ACK/NACK feedback may be performed on the PSCCH of the at least one second terminal. If the information carried by the PSCCH and the PSCCH of 1 second terminal is received in the same time window and the transmission configuration of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, the sidelink HARQ ACK/NACK feedback can be performed on the PSCCH of the 1 second terminal.

In one example, a time window may comprise at least one time slot, and in this example, the information carried by the PSCCH and PSCCH of at least 2 second terminals is received in the same time window, which may be understood as the sum of the information carried by the PSCCH and PSCCH of the second terminals received in all time slots of the same time window. For example, a time window includes N time slots, where N may be an integer greater than or equal to 1, and the N time slots are the 1 st time slot, … …, the N-1 st time slot, and the nth time slot, respectively, where the first terminal may receive information carried by the PSCCH and PSCCH of the second terminal. For example, N is 2, the first terminal receives information carried by the PSCCH and PSCCH of 1 second terminal at the 1 st slot, and receives information carried by the PSCCH and PSCCH of 1 second terminal at the 2 nd slot, so that the information carried by the PSCCH and PSCCH received at the time window includes information carried by the PSCCH and PSCCH of 2 second terminals, that is, information carried by the PSCCH and PSCCH of 1 second terminal received at the 1 st slot and information carried by the PSCCH and PSCCH of 1 second terminal received at the 2 nd slot. The HARQ ACK/NACK feedback for the sidelink for the PSCCH of the at least one second terminal may be determined according to information carried by the PSCCH and PSCCH of the 1 second terminal received at the 1 st slot and information carried by the PSCCH and PSCCH of the 1 second terminal received at the 2 nd slot, and/or transmission configuration information of the first terminal and each second terminal.

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

The processing time of the information carried by the PSCCH and PSCCH received by the first terminal in one time slot K is X time slots (for example, X is 2), and the earliest time for the first terminal to perform ACK/NACK feedback corresponding to the PSCCH and PSCCH is the earliest feedback in the PSFCH resource after K + X time slots, that is, after K + X time slots. PSFCH resources corresponding to sidelink HARQ ACK/NACK feedback information corresponding to PSCCH and PSSCH transmitted in the same time window are located in the same time slot. As shown in fig. 7, each dashed box represents a time window, taking the first dashed box as an example, X is 2, information carried by a PSCCH and a PSCCH sent by a second terminal is received in a first time slot within the time window, information carried by a PSCCH and a PSCCH sent by another second terminal is received in a second time slot within the time window, if ACK/NACK feedback is performed on the received information carried by the PSCCH and the PSCCH sent by the 2 second terminals, information feedback is performed through a PSFCH resource of the same time slot, as shown in fig. 7, the PSFCH resource pointed by an arrow corresponding to the dashed box, and a time slot corresponding to the PSFCH resource (the 3 rd time slot after the time window) is the same time slot, and feedback is performed through the PSFCH resource of the time slot. In this way, HARQ ACK/NACK feedback is performed on multiple second terminals through the PSFCH resources of the same slot, and collision is easily generated, so in this embodiment, the HARQ ACK/NACK feedback of sidelink is determined on the PSCCH of at least one second terminal through the received information carried by the PSCCH and PSCCH of all second terminals and/or the transmission configuration information of the first terminal and each second terminal, so as to reduce feedback collision.

As shown in fig. 8, a schematic diagram of a time window corresponding to N-1 and X-2 is given, where one time window includes one time slot, each dashed box represents one time window, and taking the time window of the first dashed box as an example, a first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in one time slot of the time window, and when transmission configuration of the first terminal and each second terminal is that sidelink HARQ ACK/NACK feedback is required, time of 2 time slots is required for processing, and then it is determined to perform sidelink HARQ ACK/NACK feedback on the PSCCH of at least one second terminal. As shown in fig. 8, feedback is performed in the PSFCH resource of the 3 rd time slot after the time slot of the time window (the time of 2 time slots is needed after the time slot of the time window for processing, and the processed first time slot has the PSFCH resource), as shown by the corresponding arrow. Taking the time window of the second dashed line box as an example, the first terminal receives information carried by the PSCCH and the PSCCH sent by at least 2 second terminals in one time slot of the time window, and when the transmission configuration of the first terminal and each second terminal requires sidelink HARQ ACK/NACK feedback, the time of 2 time slots is required for processing, and then determines to perform sidelink HARQ ACK/NACK feedback on the PSCCH of at least one second terminal. As shown in fig. 8, feedback is performed in the PSFCH resource of the 3 rd time slot after the time slot of the time window (the time of 2 time slots is needed after the time slot of the time window for processing, and the processed first time slot has the PSFCH resource), as shown by the corresponding arrow.

As shown in fig. 9, a time window corresponding to N ═ 2 and X ═ 2 is given, one time window includes 2 time slots, each dashed box represents one time window, and taking the time window of the first dashed box as an example, the first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in the time window, and when the transmission configuration of the first terminal and each second terminal is that sidelink HARQ ACK/NACK feedback is required, the time of 2 time slots is required for processing, and then it is determined that sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal. As shown in fig. 9, feedback is performed in the PSFCH resource of the 3 rd time slot after the time slot of the time window (the time of 2 time slots is needed after the time slot of the time window for processing, and the processed first time slot has the PSFCH resource), as shown by the corresponding arrow.

As shown in fig. 10, a time window corresponding to N-4 and X-2 is given, where one time window includes 4 slots, each dashed box represents one time window, and taking the time window of the first dashed box as an example, a first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in the time window, and when transmission configuration of the first terminal and each second terminal is that sidelink HARQ ACK/NACK feedback is required, time of 2 slots is required for processing, and then it is determined that sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal. As shown in fig. 10, feedback is performed in the PSFCH resource of the 3 rd time slot after the time slot of the time window (the time of 2 time slots is needed after the time slot of the time window for processing, and the processed first time slot has the PSFCH resource), as shown by the corresponding arrow.

In addition, in an embodiment, the time window is not an integer multiple of the time slot, that is, the time window is a non-integer multiple of one time slot, where one time slot includes resources (for example, the number of OFDM symbols) occupied by the PSCCH/PSCCH and resources (the number of OFDM symbols) occupied by the PSFCH, when the PSCCH/PSCCH processing time is X (for example, X is 2) time slots long, a time window corresponding to N ═ 1 is as shown in fig. 11, and a time window corresponding to N ═ 2 is as shown in fig. 12.

As shown in fig. 11, the time window is smaller than one time slot, each dashed box represents one time window, and taking the time window of the first dashed box as an example, when the first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in one time slot of the time window, and the transmission configuration of the first terminal and each second terminal requires sidelink HARQ ACK/NACK feedback, it needs 2 time slots to process (as shown in fig. 11, X is 2), and then determines to perform sidelink HARQ ACK/NACK feedback on the PSCCH of at least one second terminal. After processing for 2 slots, feedback is performed through the earliest PSFCH resource, i.e., at the position pointed by the arrow corresponding to the first dashed box in fig. 11. As shown in fig. 12, the time window is greater than one time slot and less than 2 time slots, each dashed box represents a time window, and taking the time window of the first dashed box as an example, when the first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in the time window, and the transmission configuration of the first terminal and each second terminal is that sidelink HARQ ACK/NACK feedback needs to be performed, time of 2 time slots is required to be processed (as shown in fig. 12, X is 2) to determine at least one second terminal that needs to be fed back. After 2 slots of time, the PSSCH of at least one second terminal is fed back with sidelink HARQ ACK/NACK via the earliest PSFCH resource, i.e. at the position pointed by the arrow corresponding to the first dashed box in fig. 12.

In addition, in this embodiment, information carried by the PSCCH and sent by at least 2 second terminals is received in the same time window, and the transmission configuration of the first terminal and each second terminal requires sidelink HARQ ACK/NACK feedback, and a target feedback terminal, that is, the at least one second terminal, is determined from the at least 2 second terminals based on receiving the information carried by the PSCCH and sent by the at least 2 second terminals or/and the transmission configuration between the first terminal and each two second terminals. Then, target feedback information (HARQ ACK/NACK) may be returned to the target feedback terminal based on transmission configuration information between the first terminal and the target feedback terminal. It can be understood that, when a first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in the same time window, at least 2 sidelink ACK/NACK information feedbacks are required, and since the number of feedbacks that can be simultaneously transmitted by the first terminal is limited, collision is easily generated, in this embodiment, if the first terminal receives information carried by PSCCH and PSCCH sent by at least 2 second terminals in the same time window, based on receiving information carried by PSCCH and PSCCH sent by at least 2 second terminals or/and a transmission configuration between the first terminal and each of two second terminals, the first terminal can determine the second terminal that needs to transmit feedback from among the at least 2 second terminals, so as to reduce feedback collision and ensure the reasonableness of determining at least one second terminal that feeds back.

In the embodiment of the present invention, when there is a collision easily in the transmission of multiple sidelink ACK/NACK messages, a suitable processing mechanism is needed, and an HARQ feedback method according to the embodiment of the present invention provides an operation of multiple sidelink ACK/NACK messages, that is, a received information carried by PSCCHs and PSCCHs of all second terminals and/or transmission configuration information of a first terminal and each second terminal determines to perform sidelink HARQ ACK/NACK feedback on the PSCCHs of at least one second terminal, so that the collision of HARQ ACK/NACK feedback can be reduced, and thus the influence caused by the collision can be reduced.

In one embodiment, the receiving information carried by the PSCCH and PSCCH of at least 2 second terminals in the same time window includes: receiving information carried by the PSCCH and PSSCH of at least 2 second terminals in the same time slot.

In this embodiment, a time window includes one time slot, that is, the same time window includes one time slot, and the same time slot is a time slot included in the same time window. As shown in fig. 8. Receiving PSCCH and PSSCH carried information of at least 2 second terminals in the same time slot of the same time window, configuring the transmission of the first terminal and each second terminal to need sidelink HARQ ACK/NACK feedback, and determining that the sidelink HARQ ACK/NACK feedback is carried out on the PSSCH of at least one second terminal according to the PSCCH and PSSCH carried information 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.

For example, the information carried by the PSCCH and the PSCCH of 5 second terminals is received in the same time slot of the same time window, and the transmission configuration of the first terminal and each second terminal requires sidelink HARQ ACK/NACK feedback, if the feedback of sidelink HARQ ACK/NACK is determined to be carried out on 2 second terminals according to the information carried by the PSCCH and PSCCH of all second terminals received in the same time slot and/or the transmission configuration information of the first terminal and each second terminal, the feedback collision is reduced.

If the information carried by the PSCCH and the PSCCH of 1 second terminal is received in the same timeslot and the transmission configuration of the first terminal and each second terminal is configured to require sidelink HARQ ACK/NACK feedback, the sidelink HARQ ACK/NACK feedback can be performed on the PSCCH of the 1 second terminal.

In one embodiment, determining to perform sidelink HARQ ACK/NACK feedback on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and PSCCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal includes:

the first information includes one or more of:

service characteristics of a data packet carried by PSSCH (packet data channel) carried information sent by a second terminal, wherein the service characteristics at least comprise priority and/or time delay;

transmitting configuration information of the first terminal and the second terminal;

the first terminal decodes the PSSCH information sent by the second terminal correctly or not;

the RSRP (Reference Signal Receiving Power) of information carried by the PSSCH transmitted by the second terminal measured by the first terminal;

the distance between the first terminal and the second terminal is large.

That is, the first terminal determines to perform sidelink HARQ ACK/NACK feedback on the psch of at least one second terminal according to one or more of the following information:

the traffic characteristics of the data packet carried by the psch sent by the second terminal may include: information such as QoS (Quality of Service), priority, and delay;

PSSCH retransmission times sent by the second terminal;

the first terminal judges whether PSSCH decoding sent by the second terminal is correct or not; it can be understood as a decoding result of information carried by the psch transmitted by the second terminal by the first terminal, for example, the decoding result may be a decoding correctness or a decoding error.

The RSRP of the PSSCH sent by the second terminal and measured by the first terminal;

the distance between the first terminal and the second terminal is large.

That is, in this embodiment, at least one second terminal that needs to be fed back is determined from at least 2 second terminals through one or more items of service characteristics of a data packet carried by information carried by PSSCH carried by the second terminal, transmission configuration information of the first terminal and the second terminal, information retransmission times of the PSSCH carried by the second terminal, whether decoding of information carried by the PSSCH carried by the second terminal by the first terminal is correct, RSRP of information carried by the PSSCH carried by the second terminal measured by the first terminal, and distance between the first terminal and the second terminal, and then HARQ ACK/NACK feedback of sidelink is performed on the PSSCH of the at least one second terminal. In other words, in the feedback process, one or more items in the first information are considered, on one hand, the determined at least one second terminal can be ensured to meet the requirement of the first information, and on the other hand, the feedback is not performed on all the second terminals regardless of the situation between the second terminals and the first terminal, but the feedback is performed on the at least one second terminal determined based on the first information, so that the occurrence of the conflict can be reduced.

In one embodiment, the transmission configuration information of the first terminal and the second terminal includes:

the configuration of the sidelink HARQ ACK/NACK feedback for the first and second terminals is to support HARQ NACK feedback only or the configuration of the sidelink HARQ ACK/NACK feedback for the first and second terminals is to support HARQ ACK and HARQ NACK feedback.

Namely, the transmission configuration information of the first terminal and the second terminal includes:

the communication between the first UE and the second UE is sidelink unicast communication or sidelink multicast communication, and if the communication is the sidelink multicast communication, the configuration information of the multicast communication mode comprises the configuration information of the following mode 1 or the configuration information of the mode 2;

wherein, mode 1: multicast communication requiring explicit group member access control, wherein the organization members are controlled by the head of a fleet, for example, multicast communication in which vehicles are driven in formation;

mode 2: similar to broadcast multicast communication, the UE determines whether it belongs to a group member based on a certain criterion, for example, based on distance, which belongs to multicast communication without admission control;

and the configuration of sidelink HARQ ACK/NACK feedback for the first and second terminals is to support HARQ NACK feedback only, or to support feedback of HARQ ACK and HARQ NACK.

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 whether the configuration of sidelink HARQ ACK/NACK feedback of the first terminal and the second terminal supports HARQ NACK feedback only, or HARQ ACK and HARQ NACK feedback, and the at least one second terminal that needs feedback may be determined more accurately from among the at least 2 second terminals through the transmission configuration information, and then the sidelink HARQ ACK/NACK feedback is performed on the at least one second terminal, so as to reduce occurrence of collision.

In one embodiment, the PSCCH information of the second terminal includes one or more of:

the priority of a data packet carried by PSSCH carried information sent by a second terminal;

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

The service characteristics of the data packet carried by the psch sent by the second terminal include: priority, time delay, etc.

The number of the psch retransmissions sent by the second terminal may be explicitly indicated, or may be implicitly indicated by a redundancy version and/or an ndi (new Data indicator), so as to determine that the current psch is the second retransmission of the psch.

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

The geographical location information of the second terminal, allowing for reduced signalling overhead, may be coarse geographical location information, such as truncated GPS coordinates or an identification of an area.

That is, the PSCCH of the second terminal may include one or more of the above, and the HARQ ACK/NACK feedback for sidelink may be determined based on the PSCCH carried information of the at least one second terminal, that is, in the feedback process, the at least one second terminal that needs to be fed back is accurately determined from the at least 2 second terminals in consideration of the PSCCH carried information of the second terminal, and the HARQ ACK/NACK feedback for sidelink is performed on the PSCCH of the at least one second terminal, so as to reduce occurrence of collision.

In one embodiment, determining HARQ ACK/NACK feedback for sidelink for the psch of at least one second terminal comprises:

the first criterion includes one or more of:

That is, the first terminal determines that the HARQ ACK/NACK feedback of the sidelink is performed on the PSCCH of at least one second terminal according to the received PSCCH and PSCCH information of all the second terminals, and specifically includes one or more combinations of the following criteria:

the PSSCH between the second terminals with the same priority carries out HARQ ACK/NACK feedback with small time delay preferentially, thereby avoiding packet loss of a sending end due to the problem of time delay;

the received RSRP of the PSSCH of the second terminal is higher than a threshold, and HARQ ACK/NACK feedback is preferentially carried out, wherein the RSRP threshold of the PSSCH is pre-configured or network configured;

and the distance between the first terminal and the second terminal is less than a threshold, and the threshold of the distance is pre-configured or network-configured to perform HARQ ACK/NACK feedback preferentially.

For example, 5 second terminals send PSCCH and PSCCH-carried information to a first terminal, and after the first terminal receives the PSCCH and PSCCH-carried information sent by the 5 second terminals to the first terminal in the same time slot, according to a first criterion, it determines to perform sidelink HARQ ACK/NACK feedback on the PSCCH of at least one second terminal. If the priority of the data packet carried by the information carried by the PSSCH of 3 second terminals among the 5 second terminals is higher, for example, all the priority is greater than the preset priority threshold, then sidelink HARQ ACK/NACK feedback may be performed on the PSSCH of at least one second terminal among the 3 second terminals.

For another example, through the combination of the priority and the distance of the data packet carried by the information carried by the PSCCH, if the priority of the data packet carried by the information carried by the PSCCH of each of the 5 second terminals is lower, for example, both are smaller than the preset priority threshold, but the distance between 1 second terminal and the first terminal in the 5 second terminals is closer, for example, both the distances are smaller than the preset distance threshold, then the sidelink HARQ ACK/NACK feedback may be performed on the PSCCH of the 1 second terminal.

For another example, through the combination of the priority and the time delay of the data packets carried by the information carried by the PSCCH, if the priority of the data packets carried by the information carried by the PSCCH of 3 second terminals among 5 second terminals is the same and the priority is the highest. The feedback of the HARQ ACK/NACK of sidelink can be carried out on the PSSCH of the second terminal with smaller time delay in 3 second terminals with the same priority of the data packet carried by the PSCCH.

By determining at least one second terminal from the at least 2 second terminals according to the first criterion, the determined at least one terminal can meet one or more requirements of priority, time delay, RSRP and distance, the obtained at least one second terminal needing feedback can be more suitable for practical situations, and collision can be reduced when performing sidelink HARQ ACK/NACK feedback on the PSSCH of the at least one second terminal.

In one embodiment, the first criteria further includes:

Namely, sidelink unicast communication is performed between the first terminal and all the second terminals, HARQ ACK and HARQ NACK feedback is supported between the first terminal and the second terminals, and HARQ ACK/NACK feedback is preferentially performed for the second terminals which can correctly decode the received information carried by the psch of the second terminals. It will be appreciated that the first criterion, on the basis of a first criterion relating to one or more of priority, latency, RSRP and distance, further comprises: the principle of HARQ ACK priority, and the priority of the correctly received psch of the second terminal for HARQ ACK/NACK feedback. Since in this case the first terminal feeds back HARQ NACK and does not send any HARQ ACK/NACK feedback information with similar functionality, it tells the second terminal that the psch was not received correctly. Therefore, the feedback of the HARQ ACK information can indicate that the second terminal does not need to retransmit the PSSCH, so that the load of the system is further reduced, and the interference is reduced.

In one embodiment, the first criteria further includes:

And the first terminal and all the second terminals are in sidelink multicast communication, and the HARQ ACK/NACK feedback mode is configured in such a way that the first terminal only supports the feedback of HARQ NACK. The PSSCH of at least one second terminal is selected by the first terminal for HARQ ACK/NACK feedback.

Namely, the first criterion further includes: the PSSCH of the second terminal carries information for feeding back the HARQ NACK prior to the initial transmission (i.e., the first transmission). Therefore, the second terminal which initially transmits the information carried by the PSSCH can preferentially feed back, and the feedback rationality is improved.

In one embodiment, the first criteria further includes:

And the first terminal and all the second terminals are in sidelink multicast communication, and the HARQ ACK/NACK feedback mode is configured in a way that the first terminal supports the feedback of HARQ ACK and HARQ NACK. The PSSCH of at least one second terminal is selected by the first terminal for HARQ ACK/NACK feedback. Namely, the first criterion further includes: the HARQ ACK priority rule is that HARQ ACK/NACK feedback is performed on the basis of the PSSCH of the second terminal that is correctly received. In other words, in the feedback process, not only HARQ ACK priority is considered, but also whether the received information carried by the PSSCH of the second terminal is correctly decoded is considered, and if the information can be correctly decoded, feedback is prioritized, so that feedback rationality is improved.

In one embodiment, the first criteria further includes:

That is, multicast communication is performed between the first terminal and all the second terminals, the HARQ ACK/NACK feedback mode between the first terminal and the second terminals in the set 1 is configured to allow the first terminal to support feedback of HARQ ACK and HARQ NACK, and the HARQ ACK/NACK feedback mode between all the second terminals in the set 1 and the first terminal is configured to allow feedback of HARQ ACK and HARQ NACK. The HARQ ACK/NACK feedback mode between the first terminal and the second terminals in the set 2 is configured such that the first terminal only supports feedback of HARQ NACK, and all the second terminals in the set 2 are terminals that only support feedback of HARQ NACK. The first terminal selects the pschs of at least one second terminal for feedback of HARQ ACK/NACK, i.e. the first criterion further includes: the sidelink HARQ NACK feedback corresponding to the PSSCH of the second terminal in the set 2 is prior to the sidelink HARQ ACK/NACK feedback in the set 1, namely the second terminal which only supports the feedback of the HARQ NACK between the second terminal and the first terminal is prior to the second terminal which supports the feedback of the HARQ ACK and the HARQ NACK between the second terminal and the first terminal, so that the second terminal which only supports the feedback of the HARQ NACK is preferentially fed back, and the reasonability of the feedback is ensured.

In one embodiment, the first criteria further includes:

Unicast communication is between the first terminal and the second terminal in set 3, and multicast communication is between the second terminal in set 4. Namely, the first criterion further includes: the second terminal in the set 4 for multicast communication preferentially performs sidelink HARQ ACK/NACK feedback, which can ensure that the second terminal for multicast communication preferentially performs feedback, so that the feedback is more reasonable.

In one embodiment, the first criteria further includes:

I.e. mode 1 multicast communication between the first UE and the second UE of set 5 and mode 6 multicast communication between the second UE of set 2. Namely, the first criterion further includes: the PSSCH of the second UE in the mode 1 multicast communication preferentially performs sidelink HARQ ACK/NACK feedback, so that the second terminal performing the multicast communication through the mode 1 can be preferentially fed back, and the feedback is more reasonable.

In one embodiment, determining the sidelink HARQ ACK/NACK feedback to the psch of the at least one second terminal according to a first criterion comprises: the first terminal determines the priority of at least 2 second terminals according to a first criterion; determining a set of priority orders of the second terminals needing Sidelink ACK/NACK feedback according to the priorities of at least 2 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 orders; the first terminal determines corresponding path loss according to the RSRP of the PSSCH of each second terminal and determines the power required by 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 orders, so that the sum of the total power of all PSFCHs transmitted by the first terminal in the set of PSFCHs determined to be transmitted by the first terminal does not exceed the maximum transmission power of the first terminal.

The upper limit of the number of the second terminals in the set of priority orders may be a value agreed by a protocol, pre-configured, or configured by a network.

That is, in the process of determining at least one second terminal needing to perform feedback from among the at least 2 second terminals, the total power required for transmission needs to be considered, so as to ensure that the maximum transmission power of the first terminal can meet the requirement of the total power required for transmitting HARQ ACK/NACK feedback, ensure that feedback can be performed normally, and improve the stability of feedback.

In one embodiment, the determining, by the first terminal, the set of PSFCHs transmitted by the first terminal according to the order of the second terminal in the set of priority orders includes:

initializing i-2;

That is, as long as the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the ith position is less than or equal to the maximum transmission power of the first terminal, it indicates that the first terminal still has transmission power greater than or equal to the transmission power required for transmitting feedback to the terminal at the ith position, and the PSFCH transmission of the terminal ranked at the ith position can be put into the set S until i is greater than N or the sum of the total transmission power corresponding to the set S and the transmission power of the terminal at the ith position is greater than the maximum transmission power of the first terminal. In this way, normal transmission to the PSSCH in the set of PSFCHs can be ensured.

In all the above embodiments, further including that the number of the second terminals that the first terminal selects to perform sidelink HARQ ACK/NACK feedback may be more than one. Determining whether to support transmission of more than one PSFCH according to the power headroom of the first terminal, as follows:

after determining the set of the first terminal according to the priority order, the first terminal may estimate a corresponding path loss according to RSRP of the PSSCH of each second terminal in the set of the priority order, and determine the power required for transmission of the PSFCH, where the specific formula is as follows:

PPSFCH,i＝min(PSL_max,P0+a*PLSL,i)。

wherein PPSFCH, i is the power required for the PSFCH transmission of terminal i in the set of priority orders, represents the transmission power of the PSFCH channel transmitted by the HARQ ACK/NACK information fed back by the first terminal to terminal i in the second terminal in the set of priority orders (i.e. the terminal ranked at the ith position), P0 is the target reception sensitivity preconfigured or configured by the network, a is a factor for path loss compensation, PLSL, i is the path loss between terminal i in the second terminal and the first terminal, and PSL _ max is the maximum power of the terminal at sidelink transmission.

And the first terminal determines the set of the PSFCHs transmitted by the first terminal according to the sequence of the second terminal in the set of the priority sequences, so that the sum of the total power of all the PSFCHs transmitted by the first terminal is determined to be not more than the maximum transmission power of the first terminal. The specific treatment process is as follows:

suppose that: and the second terminal in the priority order set is the terminal i, i is 1, 2, …, N according to the priority order.

The first terminal determines the set for performing PSFCH transmission as S, the S set initializes the terminal 1 including the second terminal with the highest priority in the priority sequence set, and the second terminal in the S set is indexed by k.

Step 0: initializing i to 1;

step 1: the PSFCH transmission for terminal i is put into the S-set if the first condition, i ═ i +1, is met. The first condition is that: sigma_kP_PSFCH，k+P_PSFCH，i≤P_{SL_Max}When k second terminals, sigma, have been placed in the current set S_kP_PSFCH，kThe total transmission power corresponding to k second terminals in the current set S.

Step 2: and repeating step 1 until i is larger than N to obtain a set S, wherein PSSCH of all second terminals in the set S is PSSCH of the second terminal which determines to perform sidelink HARQ ACK/NACK feedback transmission by the first terminal.

The embodiment of the invention provides a method for reducing conflict by selecting at least one sidelink ACK/NACK feedback according to a selection criterion when a first terminal needs to transmit a plurality of sidelink ACK/NACK information at the same time.

Referring to fig. 13, fig. 13 is a structural diagram of a first terminal according to an embodiment of the present invention, and as shown in fig. 13, a terminal 1300 includes:

a receiving module 1201, configured to receive information carried by PSCCH and PSCCH of at least 2 second terminals in the same time window, where transmission configuration of the first terminal and each second terminal is to need sidelink HARQ ACK/NACK feedback;

a determining module 1302, configured to determine that the sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and PSCCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal.

In one embodiment, the same time window includes a time slot;

and the receiving module is used for receiving the PSCCH and PSSCH carried information of at least 2 second terminals in the same time slot.

In an embodiment, the determining module 1302 is configured to determine HARQ ACK/NACK feedback for sidelink for at least one second terminal psch according to the first information;

the first information comprises one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

In an embodiment, the determining module is configured to determine that the PSSCH of the at least one second terminal is subject to sidelink HARQ ACK/NACK feedback according to a first criterion;

the first criterion includes one or more of:

In one embodiment, the first criterion further comprises:

In one embodiment, the determining module includes:

a priority determining module, configured to determine priorities of the at least two second terminals according to a first criterion;

a first set determining module, configured to determine, according to the priorities of the at least two second terminals, a set of priority orders of the second terminals that need to perform Sidelink ACK/NACK feedback;

a loss determining module, configured to determine a corresponding path loss according to RSRP of the PSSCH of each second terminal in the set of priority orders;

a power determining module, configured to determine a corresponding path loss according to RSRP of the PSSCH of each second terminal, and determine power required for PSFCH transmission;

a second set determining module, configured to determine, according to an order of a second terminal in the set of priority orders, a set of PSFCHs transmitted by the first terminal, so that a sum of total powers of all determined PSFCH transmissions in the set of PSFCHs transmitted by the first terminal does not exceed a maximum transmission power of the first terminal.

In one embodiment, the second set determining module is configured to include:

the sorting module is used for sorting the second terminals in the set of the priority order from high to low according to the priority, the number of the second terminals in the set of the priority order is N, and N is a positive integer greater than or equal to 1;

a first initialization module, configured to initialize a set for performing PSFCH transmission as S, where the initialized set of S includes a terminal with a highest priority in the set of priority orders;

a second initialization module, configured to initialize i-2;

an entering module, configured to enter PSFCH transmissions of terminals ranked in an ith position in the set of priority orders into an S set if a first condition is satisfied;

a target determining module, configured to increase i by 1, and return to the step of putting PSFCH transmissions of terminals at the ith position in the set of priority orders into an S set if the following first condition is met, until i is greater than N, to obtain a set S, and determine PSSCHs of all second terminals in the set S as PSSCHs of a second terminal performing sidelink HARQ ACK/NACK feedback for the first terminal;

Referring to fig. 14, fig. 14 is a structural diagram of another first terminal according to an embodiment of the present invention, and as shown in fig. 14, the first terminal includes: a transceiver 1410, a memory 1420, a processor 1430, and a program stored on the memory 1420 and executable on the processor 1430, wherein:

a transceiver 1410, configured to receive information carried by PSCCH and PSCCH of at least 2 second terminals in the same time window, where transmission configuration of the first terminal and each second terminal is to need sidelink HARQ ACK/NACK feedback;

a processor 14300, configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and PSCCHs of all second terminals and/or the transmission configuration information of the first terminal and each second terminal.

The transceiver 1410, among other things, may be used to receive and transmit data under the control of the processor 1430.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1430, and various circuits, represented by memory 1420, specifically linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1410 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

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

It should be noted that the memory 1420 is not limited to being on the terminal, and the memory 1420 and the processor 1430 may be separated in different geographical locations.

In one embodiment, the same time window includes a time slot;

and a transceiver for receiving information carried by the PSCCH and the PSSCH of at least 2 second terminals in the same time slot.

In one embodiment, the processor is configured to determine HARQ ACK/NACK feedback for sidelink for at least one second terminal psch according to the first information;

the first information comprises one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

In an embodiment, the processor 1430 is configured to determine, according to a first criterion, to perform sidelink HARQ ACK/NACK feedback on the psch of at least one second terminal;

the first criterion includes one or more of:

In one embodiment, the first criterion further comprises:

In one embodiment, the processor 1430 is configured to

In one embodiment, a processor 1430 for

initializing i-2;

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

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the processing method of the information data block according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A HARQ feedback method is applied to a first terminal and comprises the following steps:

receiving information carried by PSCCH and PSSCH of at least 2 second terminals in the same time window, and configuring transmission of the first terminal and each second terminal to need sidelink HARQ ACK/NACK feedback;

determining that the PSSCH of at least one second terminal is subjected to sidelink HARQ ACK/NACK feedback according to the received information carried by the PSCCHs and PSSCHshs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal;

wherein, determining to perform sidelink HARQ ACK/NACK feedback on PSSCH of at least one second terminal comprises:

the first criterion includes at least two of:

HARQ ACK/NACK feedback is carried out preferentially when the received RSRP of the PSSCH of the second terminal is higher than the threshold;

2. The method of claim 1, wherein the same time window comprises one time slot;

3. The method of claim 1 or 2, wherein determining the sidelink HARQ ACK/NACK feedback for the PSSCH of at least one second terminal according to the received PSCCH and PSSCH carried information of all the second terminals and/or transmission configuration information of the first terminal and each second terminal comprises:

the first information comprises one or more of:

4. The method of claim 1 or 2, wherein the transmission configuration information of the first and second terminals comprises:

5. The method of claim 1 or 2, wherein the PSCCH information for the second terminal includes one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

6. The method of claim 1, wherein the first criterion further comprises:

7. The method of claim 1, wherein the first criterion further comprises:

8. The method of claim 1, wherein the first criterion further comprises:

9. The method of claim 1, wherein the first criterion further comprises:

10. The method of claim 1, wherein the first criterion further comprises:

11. The method of claim 1, wherein the first criterion further comprises:

12. The method of claim 1, wherein determining the sidelink HARQ ACK/NACK feedback for the PSSCH of the at least one second terminal according to a first criterion comprises:

13. The method according to any of claims 6-11, wherein the determining HARQ ACK/NACK feedback for sidelink for the psch of at least one second terminal according to a first criterion comprises:

14. The method of claim 12, wherein the first terminal determining the set of PSFCHs transmitted by the first terminal in the order of the second terminals in the set of priority orders comprises:

initializing i-2;

15. A first terminal, comprising:

a determining module, configured to determine, according to received information carried by PSCCHs and PSCCHs of all second terminals and/or transmission configuration information of a first terminal and each second terminal, that a sidelink HARQ ACK/NACK feedback is performed on the PSCCHs of at least one second terminal;

the determining module is configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSSCH of the at least one second terminal according to a first criterion;

the first criterion includes at least two terms:

16. The first terminal of claim 15, wherein the same time window comprises one time slot;

17. The first terminal of claim 15 or 16, wherein the determining module is configured to determine HARQ ACK/NACK feedback for sidelink for at least one second terminal psch according to the first information;

the first information comprises one or more of:

18. The first terminal of claim 15 or 16, wherein the transmission configuration information of the first and second terminals comprises:

19. The first terminal of claim 15 or 16, wherein the PSCCH information for the second terminal includes one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

20. A first terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSCCH of at least one second terminal according to the received information carried by the PSCCHs and the PSCCHs of all the second terminals and/or the transmission configuration information of the first terminal and each second terminal;

the processor is configured to determine that sidelink HARQ ACK/NACK feedback is performed on the PSSCH of the at least one second terminal according to a first criterion;

the first criterion includes at least two terms:

21. The first terminal of claim 20, wherein said same time window comprises one time slot;

22. The first terminal of claim 20 or 21, wherein the processor is configured to determine HARQ ACK/NACK feedback for sidelink for at least one second terminal psch according to the first information;

the first information comprises one or more of:

23. The first terminal of claim 20 or 21, wherein the transmission configuration information of the first and second terminals comprises:

24. The first terminal of claim 20 or 21, wherein the PSCCH information for the second terminal includes one or more of:

the first terminal and the second terminal transmit configuration indication;

geographical location information of the second terminal.

25. The first terminal of claim 20, wherein the first criterion further comprises:

26. The first terminal of claim 20, wherein the first criterion further comprises:

27. The first terminal of claim 20, wherein the first criterion further comprises:

28. The first terminal of claim 20, wherein the first criterion further comprises:

29. The first terminal of claim 20, wherein the first criterion further comprises:

30. The first terminal of claim 20, wherein the first criterion further comprises:

31. The first terminal of claim 20, wherein the processor is configured to determine the priority of the at least two second terminals according to a first criterion;

32. The first terminal of any of claims 25-30, wherein the processor is configured to

33. The first terminal of claim 31, wherein the processor is configured to

initializing i-2;

34. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, realizes the steps of the HARQ feedback method according to any of the claims 1 to 14.