CN116470996A - HARQ feedback method and device for multicast communication and user equipment - Google Patents

HARQ feedback method and device for multicast communication and user equipment Download PDF

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Publication number
CN116470996A
CN116470996A CN202210022998.XA CN202210022998A CN116470996A CN 116470996 A CN116470996 A CN 116470996A CN 202210022998 A CN202210022998 A CN 202210022998A CN 116470996 A CN116470996 A CN 116470996A
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sci
resource
resource location
preempted
priority value
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冯媛
刘兆璘
原浩宁
周晓星
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CICTCI Technology Co Ltd
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CICTCI Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a HARQ feedback method, a device and equipment for multicast communication, which relate to the technical field of communication, wherein the method is applied to a first UE and comprises the following steps: receiving first direct link control information SCI sent by a second UE; if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI transmitted by the second UE is not successfully received at the resource location reserved by the first SCI, and if it is determined that the second UE is not in a scene other than the scene where the resource at the resource location reserved by the first SCI is preempted, NACK is transmitted to the second UE. According to the scheme, the probability of misjudging as ACK in the NACK only feedback mode is reduced, and the system performance in the NACK only mode is improved.

Description

HARQ feedback method and device for multicast communication and user equipment
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for HARQ feedback in multicast communications, and a user equipment.
Background
The new wireless internet of vehicles (New Radio Vehicle to Everything, NR V2X) can support three data transmission modes of unicast, multicast and broadcast in order to meet various service requirements of the internet of vehicles. Among them, in order to improve the reliability of multicast communication, 3GPP has agreed through discussion to introduce a feedback mechanism, such as a hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, abbreviated as HARQ) feedback mechanism, in multicast. Current feedback mechanisms include feedback of both ACK/NACK and NACK only modes.
For multicast communications, there are two types of scenarios: 1) Multicast with group management; 2) Multicast without group management. For the first type of scenario, if the physical through link feedback channel (Physical Sidelink Feedback Channel, PSFCH) feedback resources are limited, a NACK only feedback mode is employed; for the second category of scenes, NR introduces a multicast scene based on distance feedback, such as a scene of sensor perception, and for this scene only NACK only mode can be used.
For NACK only multicast communication, the following scenario is assumed: the users { A, B, C, D, E, F, G } belong to a group, and the user A sends service data to the users { B, C, D, E, F, G }; wherein, the maximum transmission times of the Transport Block (TB) are 3: nmax=2; the transmission procedure is as follows:
primary transmission: the next transmission resource is indicated in the through link control information (Sidelink Control Information, SCI) sent by user a. The users B, C, D, E and F all receive successfully, namely, the feedback ACK is performed in the ACK/NACK mode, and the feedback is not required in the NACK only mode; SCI decoding of the user G is successful, but service data decoding fails, namely NACK needs to be fed back in NACK only mode, and negative feedback is sent; after user a receives it is determined that retransmission is also required.
Retransmission: for example, the physical direct link control channel (Physical Sidelink Control Channel, PSCCH) of the retransmission collides, so that all users do not parse the PSCCH, and users B, C, D, E, F, G do not feed back, since user a does not receive any information to be successfully received for all users, and no retransmission is performed.
Therefore, in the NACK only scenario, discontinuous transmission (Discontinuous Transmission, DTX) may be misjudged as ACK, and in terms of simulation, the performance of the NACK only mode is much worse than that of the ACK/NACK mode, and in a certain configuration, the performance is worse than that of blind retransmission.
Disclosure of Invention
The purpose of the application is to provide a method, a device and user equipment for HARQ feedback of multicast communication, so as to solve the problem of poor transmission reliability in NACK only feedback mode in the prior art.
In order to achieve the above object, an embodiment of the present application provides a HARQ feedback method for multicast communication, which is applied to a first UE, and the method includes:
receiving first direct link control information SCI sent by a second UE;
if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI transmitted by the second UE is not successfully received at the resource location reserved by the first SCI, and if it is determined that the second UE is not in a scene other than the scene where the resource at the resource location reserved by the first SCI is preempted, NACK is transmitted to the second UE.
Optionally, the first SCI and the second SCI each include first stage cut-through link control information 1st SCI and second stage cut-through link control information 2nd SCI;
the 1st SCI carries a resource indication and a priority value;
wherein the resource indication is used to indicate at least one of:
the first resource position of the current transmission of the present period;
a second resource location reserved for at least one transmission adjacent to the current transmission in the current period;
and a third resource position reserved for at least one transmission in the next period adjacent to the current period, wherein the resource in the third resource position is used for bearing the next TB adjacent to the transmission block TB transmitted at the current time.
Optionally, the method further comprises:
determining that the second SCI was not successfully received if any of the following conditions are met:
the second SCI is not received correctly;
and successfully receiving the 1st SCI of the second SCI at a second resource position indicated by the 1st SCI of the first SCI, wherein the resource at the first resource position indicated by the 1st SCI of the second SCI is inconsistent with the resource at a third resource position indicated by the last TB adjacent to the TB transmitted at the present time, and judging that the resource at the first resource position indicated by the 1st SCI of the second SCI is not preempted.
Optionally, the second SCI is not received correctly, including any of:
unsuccessfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI;
unsuccessfully receiving a 1st SCI of the second SCI at a third resource location indicated by the 1st SCI of the first SCI;
successfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI, the 2nd SCI of the second SCI not being successfully received at the first resource location indicated by the 1st SCI of the second SCI;
the 1st SCI of the second SCI is successfully received at a third resource location indicated by the 1st SCI of the first SCI, and the 2nd SCI of the second SCI is not successfully received at the first resource location indicated by the 1st SCI of the second SCI.
Optionally, the method further comprises:
determining whether resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted according to a first pre-configuration parameter related to a preemption mechanism and/or a priority value carried by the 1st SCI of the second SCI.
Optionally, determining whether the resource at the second resource location or the third resource location indicated by the 1st SCI of the first SCI is preempted according to the first preconfigured parameter related to the preemption mechanism and/or the priority value carried by the 1st SCI of the second SCI, including any one of the following:
determining that resources at a second resource location or a third resource location indicated by a 1st SCI of the first SCI are not preempted without pre-configuring the first pre-configuration parameters;
under the condition that the first pre-configuration parameter is assigned to be enabled, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to a priority value carried by the 1st SCI of the first SCI and a priority value carried by the 1st SCI of the second SCI;
and under the condition that the first pre-configuration parameter is assigned as a priority threshold value, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to the priority threshold value, the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI.
Optionally, determining whether the resource at the second resource location or the third resource location indicated by the 1st SCI of the first SCI is preempted according to the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI, including any one of the following:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority value carried by the 1st SCI of the first SCI;
and under the condition that the priority value carried by the 1st SCI of the second SCI is greater than that carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
Optionally, determining whether the resource at the second resource location or the third resource location indicated by the 1st SCI of the first SCI is preempted according to the priority threshold, the priority value carried by the 1st SCI of the first SCI, and the priority value carried by the 1st SCI of the second SCI, including any one of the following:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority threshold value and the priority value carried by the 1st SCI of the first SCI;
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are not preempted under the condition that a priority value carried by the 1st SCI of the second SCI is greater than the priority threshold value;
and under the condition that the priority value carried by the 1st SCI of the second SCI is smaller than the priority threshold value and larger than the priority value carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
In a second aspect, to achieve the above object, an embodiment of the present application further provides a user equipment, including: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the HARQ feedback method for multicast communication as described above.
In a third aspect, an embodiment of the present application further provides an HARQ feedback device for multicast communication, which is applied to a first user equipment UE, where the device includes:
a receiving module, configured to receive first direct link control information SCI sent by a second UE; the first SCI includes: a resource location indication;
a sending module, configured to, if the HARQ feedback mode of the first SCI is that only a negative acknowledgement NACK is fed back and a NACK is fed back to the second UE, if the second SCI sent by the second UE is not successfully received at the resource location reserved by the first SCI, and send a NACK to the second UE in a scenario other than the scenario where it is determined that the second UE is preempted based on the resource reserved by the first SCI.
In a fourth aspect, embodiments of the present application further provide a readable storage medium having a program stored thereon, which when executed by a processor, implements the steps of the HARQ feedback method for multicast communication as described above.
The technical scheme of the application has at least the following beneficial effects:
first, a first UE receives first direct link control information SCI sent by a second UE; and secondly, if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI transmitted by the second UE is not successfully received at the resource position reserved by the first SCI, and NACK is transmitted to the second UE under other scenes except the scene of judging that the second UE is preempted based on the resource at the resource position reserved by the first SCI. Therefore, the situation that the first UE does not feed back NACK to the second UE due to the fact that retransmission data is not received after the first UE feeds back NACK to the second UE is avoided, the probability of misjudging as ACK is reduced, and the system performance under NACK only is improved.
Drawings
Fig. 1 is a flow chart of an HARQ feedback method for multicast communication according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an HARQ feedback device for multicast communication according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The following describes in detail, with reference to the accompanying drawings, the HARQ feedback method, apparatus, and user equipment for multicast communication provided by the embodiments of the present application through specific embodiments and application scenarios thereof.
As shown in fig. 1, a flow chart of an HARQ feedback method for multicast communication according to an embodiment of the present application is shown, where the method is applied to a first UE, and the method includes:
step 101, receiving first direct link control information SCI sent by a second UE;
step 102, if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI sent by the second UE is not successfully received at the resource location reserved by the first SCI, and if it is determined that the second UE is not in a scene other than the scene where the resource at the resource location reserved by the first SCI is preempted, NACK is sent to the second UE.
That is, when the HARQ feedback mode is determined to be NACK only, if the HARQ feedback for the first SCI is NACK, and the second SCI transmitted by the second UE is not successfully received at the resource location reserved by the first SCI and the second UE is not preempted based on the resource location reserved by the first SCI, for example, the first UE does not successfully receive the second SCI due to channel interference or the like, and the first UE continues to feed back NACK to the second UE.
First, a first UE receives first direct link control information SCI sent by a second UE; and secondly, if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI transmitted by the second UE is not successfully received at the resource position reserved by the first SCI, and NACK is transmitted to the second UE under other scenes except the scene of judging that the second UE is preempted based on the resource at the resource position reserved by the first SCI. Therefore, the method and the device realize that under the NACK only scene, on the basis of feeding back NACK to the second UE, if the second SCI sent by the second UE is not successfully received at the reserved resource position and the resources at the reserved resource position are not preempted, NACK is continuously fed back to the second UE, so that the probability that NACK is not fed back to the second UE due to the fact that the second SCI is not received due to poor channel quality and the like, and the second UE is misjudged as ACK due to the fact that the first UE successfully receives the second SCI is reduced, and the system performance under NACK only is improved.
As an alternative implementation, the first SCI and the second SCI each include first-stage cut-through link control information 1st SCI and second-stage cut-through link control information 2nd SCI;
the 1st SCI carries a resource indication and a priority value;
wherein the resource indication is used to indicate at least one of:
the first resource position of the current transmission of the present period; for example, when the 1st SCI is the 1st SCI in the first SCI, the first resource location is a resource location for transmitting the 2nd SCI in the first SCI;
a second resource location reserved for at least one transmission adjacent to the current transmission in the current period; that is, the 1st SCI may be used to indicate a resource location reserved for the next or next two transmissions in the present transmission period adjacent to the present transmission, e.g., the second resource location is a resource location reserved for the 1st SCI in the SCI of the next or next two transmissions;
a third resource position reserved for at least one transmission in a next period adjacent to the current period, wherein the resource in the third resource position is used for bearing a next TB adjacent to a transmission block TB of the current transmission; that is, the 1st SCI may also be used to indicate the resource location of one or more transmissions in the next TB adjacent to the currently transmitted TB.
For example, if the second SCI is a retransmission SCI of the first SCI, the resource location of the 1st SCI transmitting the second SCI may be indicated by the 1st SCI of the first SCI, and the resource location of the 2nd SCI transmitting the second SCI may be indicated by the 1st SCI of the second SCI.
Further, as an alternative implementation, the method further includes:
determining that the second SCI was not successfully received if any of the following conditions are met:
(1) The second SCI is not received correctly;
(2) And successfully receiving the 1st SCI of the second SCI at a second resource position indicated by the 1st SCI of the first SCI, wherein the resource at the first resource position indicated by the 1st SCI of the second SCI is inconsistent with the resource at a third resource position indicated by the last TB adjacent to the TB transmitted at the present time, and judging that the resource at the first resource position indicated by the 1st SCI of the second SCI is not preempted.
That is, in the case that the second SCI transmitted by the second UE is not correctly received based on the resource location reserved by the first SCI, it is determined that the first UE did not successfully receive the second SCI;
or alternatively, the process may be performed,
when the 1st SCI of the second SCI is received based on the resource position reserved by the first SCI, but the received 1st SCI of the second SCI indicates a resource position inconsistent with the resource position indicated by the last TB (namely, the TB transmitted this time is not the last TB according to the resource indication of the 1st SCI of the second SCI), and the priority value carried in the received 1st SCI of the second SCI determines that the condition of preempting the resource is not satisfied (namely, the resource at the resource position for transmitting the second SCI is determined not to be preempted), the first UE is determined not to successfully receive the second SCI.
The above (2) may be the following scenario: the physical through link control channel (Physical Sidelink Control Channel, PSCCH) is successfully decoded in the corresponding position of the previous SCI reservation indication, but the resource indication determination is not the last TB and the priority determination does not satisfy the condition of preempting its own resources.
In addition, the 1st SCI of the second SCI is successfully received at the second resource position indicated by the 1st SCI of the first SCI, the resource at the first resource position indicated by the 1st SCI of the second SCI is inconsistent with the resource at the third resource position indicated by the last TB adjacent to the TB transmitted at this time, and if the resource at the first resource position indicated by the 1st SCI of the second SCI is preempted, the change of the time-frequency position in the secondary scene is determined to be the active change of the second UE, and NACK is not fed back to the second UE.
As a specific implementation, the second SCI is not received correctly, including any of the following:
(1) Unsuccessfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI;
(2) Unsuccessfully receiving a 1st SCI of the second SCI at a third resource location indicated by the 1st SCI of the first SCI;
(3) Successfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI, the 2nd SCI of the second SCI not being successfully received at the first resource location indicated by the 1st SCI of the second SCI;
(4) The 1st SCI of the second SCI is successfully received at a third resource location indicated by the 1st SCI of the first SCI, and the 2nd SCI of the second SCI is not successfully received at the first resource location indicated by the 1st SCI of the second SCI.
For example, the above (1) and (2) may be the following scenario: the PSCCH is not successfully decoded at the corresponding location where the previous SCI indicated the reservation; in such a scenario, determining that the first UE did not successfully receive the second SCI, wherein the first UE continues to feedback NACK in such a scenario because the feedback for the first SCI is NCAK;
the steps (3) and (4) can be as follows: in this scenario, the first UE lacks HARQ enable information and source layer one identifier (L1 source ID) and destination layer one identifier (L1 destination ID), but since the HARQ enable information is unchanged in the same TB, the first UE may determine HARQ process information according to the resource information.
As an alternative implementation, the method further includes:
determining whether resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted according to a first pre-configuration parameter related to a preemption mechanism and/or a priority value carried by the 1st SCI of the second SCI.
Here, it should be noted that the first preconfigured parameter may be sl-preemption enable-r16 (which is a per pool parameter); the second resource location and/or the third resource location is a resource location reserved for transmitting the second SCI; if the current reservation is to transmit a second SCI on a second resource location, then the alternative implementation is to determine if the second resource location is preempted; if it is currently reserved to transmit the second SCI on the third resource location, then the alternative implementation is to determine if the third resource location is preempted.
As a specific implementation manner, determining whether the resource at the second resource location or the third resource location indicated by the 1st SCI of the first SCI is preempted according to the first preconfigured parameter related to the preemption mechanism and/or the priority value carried by the 1st SCI of the second SCI includes any one of the following:
(1) Determining that resources at a second resource location or a third resource location indicated by a 1st SCI of the first SCI are not preempted without pre-configuring the first pre-configuration parameters;
that is, if sl-PreemptionEnable-r16 is not configured, it indicates that the reserved resource location is not allowed to be preempted. The node (second UE) is considered to have not changed resources and continues to send feedback.
(2) Under the condition that the first pre-configuration parameter is assigned to be enabled, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to a priority value carried by the 1st SCI of the first SCI and a priority value carried by the 1st SCI of the second SCI;
here, it should be noted that, if the sl-PreemptionEnable-r16 is configured as an enable, it means that any high priority can preempt the low priority resource, and only the priority indicated by the SCI (the priority value carried in the SCI) needs to be compared with the priority information in the HARQ receiving process information maintained by the receiving node (the first UE) itself (where the HARQ receiving process information is information correspondingly maintained by the first UE according to the first SCI related information).
(3) And under the condition that the first pre-configuration parameter is assigned as a priority threshold value, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to the priority threshold value, the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI.
That is, if sl-preemption enable-r16 is configured as one of { pl1, pl2, pl3, pl4, pl5, pl6, pl7, pl8}, the corresponding comparison is made according to a specific value.
As a specific implementation manner, determining whether the resources at the second resource location or the third resource location indicated by the 1st SCI of the first SCI are preempted according to the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI includes any one of the following:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority value carried by the 1st SCI of the first SCI;
and under the condition that the priority value carried by the 1st SCI of the second SCI is larger than that carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
Here, the smaller the priority value, the higher the priority. That is, in a case where the priority indicated by the second SCI is higher than the priority indicated by the first SCI, it is determined that the resource at the second resource location indicated by the 1st SCI of the first SCI is preempted; that is, if the reserved position or the position earlier than the reserved position receives success of decoding another PSCCH and the priority is higher than the priority information recorded by the receiving process, the UE to be fed back is considered to be preempted and is not fed back at the corresponding reserved position; in another case, when the priority indicated by the second SCI is lower than the priority indicated by the first SCI, it is determined that the resource at the second resource location indicated by the 1st SCI of the first SCI is not preempted.
As a specific implementation manner, determining whether the resources at the second resource location or the third resource location indicated by the 1st SCI of the first SCI are preempted according to the priority threshold, the priority value carried by the 1st SCI of the first SCI, and the priority value carried by the 1st SCI of the second SCI includes any one of the following:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority threshold value and the priority value carried by the 1st SCI of the first SCI;
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are not preempted under the condition that a priority value carried by the 1st SCI of the second SCI is greater than the priority threshold value;
and under the condition that the priority value carried by the 1st SCI of the second SCI is smaller than the priority threshold value and larger than the priority value carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
Likewise, the smaller the priority value, the higher the priority. In this embodiment, when the priority indicated by the second SCI is higher than the priority threshold and the priority indicated by the first SCI, determining that the resource at the second resource location indicated by the 1st SCI of the first SCI is preempted; and determining that resources at the second resource location or the third resource location indicated by the 1st SCI of the first SCI are not preempted when the priority indicated by the second SCI is lower than the priority threshold or when the priority indicated by the second SCI is higher than the priority threshold and the priority indicated by the first SCI.
That is, in this embodiment, if the reserved position or the PSCCH is received earlier than the reserved position, and the priority of the receiving UE (first UE) is higher than the priority threshold and higher than the priority recorded by the corresponding receiving process, then the UE to be fed back (second UE) is considered to be preempted, and NACK feedback is not performed; if the received indication SCI priority is lower than the threshold, or the received indication SCI priority is higher than the threshold, but the SCI indication priority is not higher than the recording receiving priority, corresponding NACK feedback is made.
The HARQ feedback method for multicast communication reduces the probability that DTX is misjudged as ACK, and further improves the system performance and the transmission reliability under NACK only to a certain extent. The probability of misjudging as ACK is reduced, that is, if the sending node (second UE) is true NACK to send, the sending node (second UE) can adjust some parameters according to the true feedback condition, and the system performance is further improved.
As shown in fig. 2, the embodiment of the present application further provides an HARQ feedback device for multicast communication, which is applied to a first user equipment UE, where the device includes:
a receiving module 201, configured to receive first direct link control information SCI sent by a second UE; the first SCI includes: a resource location indication;
a transmitting module 202, configured to, if the HARQ feedback mode of the first SCI is that only a negative acknowledgement NACK is fed back and a NACK is fed back to the second UE, if the second SCI sent by the second UE is not successfully received at the resource location reserved by the first SCI, and if it is determined that the second UE is in a scenario other than the scenario where the resource reserved by the first SCI is preempted, send a NACK to the second UE.
In the HARQ feedback device for multicast communication according to the embodiment of the present application, first, the receiving module 201 receives the first direct link control information SCI sent by the second UE; next, if the HARQ feedback mode of the first SCI is that only a negative acknowledgement NACK is fed back and a NACK is fed back to the second UE, the transmitting module 202 transmits a NACK to the second UE if the second SCI transmitted by the second UE is not successfully received at the resource location reserved by the first SCI and if it is determined that the second UE is not in a scene other than the scene where the resource at the resource location reserved by the first SCI is preempted. Therefore, the situation that the first UE does not feed back NACK to the second UE due to the fact that retransmission data is not received after the first UE feeds back NACK to the second UE is avoided, probability of being misjudged as ACK is reduced, and system performance under NACK only is improved.
Optionally, the first SCI and the second SCI each include first stage cut-through link control information 1st SCI and second stage cut-through link control information 2nd SCI;
the 1st SCI carries a resource indication and a priority value;
wherein the resource indication is used to indicate at least one of:
the first resource position of the current transmission of the present period;
a second resource location reserved for at least one transmission adjacent to the current transmission in the current period;
and a third resource position reserved for at least one transmission in the next period adjacent to the current period, wherein the resource in the third resource position is used for bearing the next TB adjacent to the transmission block TB transmitted at the current time.
Optionally, the apparatus further comprises:
a first determining module, configured to determine that the second SCI is not successfully received if any of the following conditions is satisfied:
the second SCI is not received correctly;
and successfully receiving the 1st SCI of the second SCI at a second resource position indicated by the 1st SCI of the first SCI, wherein the resource at the first resource position indicated by the 1st SCI of the second SCI is inconsistent with the resource at a third resource position indicated by the last TB adjacent to the TB transmitted at the present time, and judging that the resource at the first resource position indicated by the 1st SCI of the second SCI is not preempted.
Optionally, the second SCI is not received correctly, including any of:
unsuccessfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI;
unsuccessfully receiving a 1st SCI of the second SCI at a third resource location indicated by the 1st SCI of the first SCI;
successfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI, the 2nd SCI of the second SCI not being successfully received at the first resource location indicated by the 1st SCI of the second SCI;
the 1st SCI of the second SCI is successfully received at a third resource location indicated by the 1st SCI of the first SCI, and the 2nd SCI of the second SCI is not successfully received at the first resource location indicated by the 1st SCI of the second SCI.
Optionally, the apparatus further comprises:
and the second determining module is used for determining whether the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are preempted according to the first pre-configuration parameter related to the preemption mechanism and/or the priority value carried by the 1st SCI of the second SCI.
Optionally, the second determining module is specifically configured to perform any one of the following:
determining that resources at a second resource location or a third resource location indicated by a 1st SCI of the first SCI are not preempted without pre-configuring the first pre-configuration parameters;
under the condition that the first pre-configuration parameter is assigned to be enabled, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to a priority value carried by the 1st SCI of the first SCI and a priority value carried by the 1st SCI of the second SCI;
and under the condition that the first pre-configuration parameter is assigned as a priority threshold value, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to the priority threshold value, the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI.
Optionally, the second determining module is specifically configured to perform any one of the following when determining whether the resource at the second resource location or the third resource location indicated by the 1st SCI of the first SCI is preempted according to the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority value carried by the 1st SCI of the first SCI;
and under the condition that the priority value carried by the 1st SCI of the second SCI is larger than that carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
Optionally, the second determining module is configured to determine, when the resources at the second resource location or the third resource location indicated by the 1st SCI of the first SCI are preempted according to the priority threshold, the priority value carried by the 1st SCI of the first SCI, and the priority value carried by the 1st SCI of the second SCI, specifically, to execute any one of the following:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority threshold value and the priority value carried by the 1st SCI of the first SCI;
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are not preempted under the condition that a priority value carried by the 1st SCI of the second SCI is greater than the priority threshold value;
and under the condition that the priority value carried by the 1st SCI of the second SCI is smaller than the priority threshold value and larger than the priority value carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
As shown in fig. 3, an embodiment of the present application further provides a user equipment, including: the processor 300, the memory 320 and the program stored in the memory 320 and capable of running on the processor 300, when the program is executed by the processor 300, implement the respective processes of the embodiment of the HARQ feedback method for multicast communication as described above, and achieve the same technical effects, so that repetition is avoided, and no further description is given here.
The transceiver 310 is used for receiving and transmitting data under the control of the processor 300.
Wherein in fig. 3, a bus architecture may comprise any number of interconnected buses and bridges, and in particular, one or more processors represented by processor 300 and various circuits of memory represented by memory 320, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 310 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The user interface 330 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 300 is responsible for managing the bus architecture and general processing, and the memory 320 may store data used by the processor 300 in performing operations.
In addition, the embodiment of the present application further provides a readable storage medium, where a program is stored, where the program, when executed by a processor, implements each process of the embodiment of the HARQ feedback method for multicast communication described above, and the same technical effects can be achieved, and in order to avoid repetition, a description is omitted herein. Wherein the readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the foregoing is directed to the preferred embodiments of the present application, it should be noted that modifications and adaptations to those embodiments may occur to one skilled in the art and that such modifications and adaptations are intended to be comprehended within the scope of the present application without departing from the principles set forth herein.

Claims (11)

1. A HARQ feedback method for multicast communication, applied to a first UE, the method comprising:
receiving first direct link control information SCI sent by a second UE;
if the HARQ feedback mode of the first SCI is that only negative acknowledgement NACK is fed back and NACK is fed back to the second UE, if the second SCI transmitted by the second UE is not successfully received at the resource location reserved by the first SCI, and if it is determined that the second UE is not in a scene other than the scene where the resource at the resource location reserved by the first SCI is preempted, NACK is transmitted to the second UE.
2. The method of claim 1 wherein the first SCI and the second SCI each include first stage cut-through link control information 1st SCI and second stage cut-through link control information 2nd SCI;
the 1st SCI carries a resource indication and a priority value;
wherein the resource indication is used to indicate at least one of:
the first resource position of the current transmission of the present period;
a second resource location reserved for at least one transmission adjacent to the current transmission in the current period;
and a third resource position reserved for at least one transmission in the next period adjacent to the current period, wherein the resource in the third resource position is used for bearing the next TB adjacent to the transmission block TB transmitted at the current time.
3. The method according to claim 2, wherein the method further comprises:
determining that the second SCI was not successfully received if any of the following conditions are met:
the second SCI is not received correctly;
and successfully receiving the 1st SCI of the second SCI at a second resource position indicated by the 1st SCI of the first SCI, wherein the resource at the first resource position indicated by the 1st SCI of the second SCI is inconsistent with the resource at a third resource position indicated by the last TB adjacent to the TB transmitted at the present time, and judging that the resource at the first resource position indicated by the 1st SCI of the second SCI is not preempted.
4. The method of claim 3, wherein the second SCI is not received correctly, comprising any of:
unsuccessfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI;
unsuccessfully receiving a 1st SCI of the second SCI at a third resource location indicated by the 1st SCI of the first SCI;
successfully receiving a 1st SCI of the second SCI at a second resource location indicated by the 1st SCI of the first SCI, the 2nd SCI of the second SCI not being successfully received at the first resource location indicated by the 1st SCI of the second SCI;
the 1st SCI of the second SCI is successfully received at a third resource location indicated by the 1st SCI of the first SCI, and the 2nd SCI of the second SCI is not successfully received at the first resource location indicated by the 1st SCI of the second SCI.
5. The method according to claim 2, wherein the method further comprises:
determining whether resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted according to a first pre-configuration parameter related to a preemption mechanism and/or a priority value carried by the 1st SCI of the second SCI.
6. The method of claim 5, wherein determining whether resources at the second or third resource location indicated by the 1st SCI of the first SCI are preempted based on the first pre-configuration parameters associated with the preemption mechanism and/or the priority value carried by the 1st SCI of the second SCI comprises any of:
determining that resources at a second resource location or a third resource location indicated by a 1st SCI of the first SCI are not preempted without pre-configuring the first pre-configuration parameters;
under the condition that the first pre-configuration parameter is assigned to be enabled, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to a priority value carried by the 1st SCI of the first SCI and a priority value carried by the 1st SCI of the second SCI;
and under the condition that the first pre-configuration parameter is assigned as a priority threshold value, determining whether resources at a second resource position or a third resource position indicated by the 1st SCI of the first SCI are preempted according to the priority threshold value, the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI.
7. The method of claim 6 wherein determining whether resources at the second or third resource location indicated by the 1st SCI of the first SCI are preempted based on the priority value carried by the 1st SCI of the first SCI and the priority value carried by the 1st SCI of the second SCI comprises any of:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority value carried by the 1st SCI of the first SCI;
and under the condition that the priority value carried by the 1st SCI of the second SCI is larger than that carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
8. The method of claim 6 wherein determining whether resources at the second or third resource location indicated by the 1st SCI of the first SCI are preempted based on the priority threshold, the priority value carried by the 1st SCI of the first SCI, and the priority value carried by the 1st SCI of the second SCI comprises any of:
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are preempted if the priority value carried by the 1st SCI of the second SCI is less than the priority threshold value and the priority value carried by the 1st SCI of the first SCI;
determining that resources at a second resource location or a third resource location indicated by the 1st SCI of the first SCI are not preempted under the condition that a priority value carried by the 1st SCI of the second SCI is greater than the priority threshold value;
and under the condition that the priority value carried by the 1st SCI of the second SCI is smaller than the priority threshold value and larger than the priority value carried by the 1st SCI of the first SCI, determining that the resources at the second resource position or the third resource position indicated by the 1st SCI of the first SCI are not preempted.
9. A user device, comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the HARQ feedback method of multicast communication according to any of claims 1 to 8.
10. An HARQ feedback device for multicast communication, applied to a first user equipment UE, the device comprising:
a receiving module, configured to receive first direct link control information SCI sent by a second UE; the first SCI includes: a resource location indication;
a sending module, configured to, if the HARQ feedback mode of the first SCI is that only a negative acknowledgement NACK is fed back and a NACK is fed back to the second UE, if the second SCI sent by the second UE is not successfully received at the resource location reserved by the first SCI, and send a NACK to the second UE in a scenario other than the scenario where it is determined that the second UE is preempted based on the resource reserved by the first SCI.
11. A readable storage medium, characterized in that the readable storage medium has stored thereon a program which, when executed by a processor, implements the steps of the HARQ feedback method of multicast communication according to any of claims 1 to 8.
CN202210022998.XA 2022-01-10 2022-01-10 HARQ feedback method and device for multicast communication and user equipment Pending CN116470996A (en)

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