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EP-4738955-A1 - RESOURCE RESELECTION METHOD AND APPARATUS

EP4738955A1EP 4738955 A1EP4738955 A1EP 4738955A1EP-4738955-A1

Abstract

Embodiments of the present disclosure disclose a resource reselection method and apparatus, which can be applied in Internet of Vehicles, V2X, V2V, and like systems. The method comprises: in response to listen before talk (LBT) failure occurring on a first time slot resource among multi-continuous time slot transmission resources, a terminal device triggers resource reselection for the multi-continuous time slot transmission resources. The multi-continuous time slot transmission resources comprise multiple continuous time slot transmission resources and are used for transmission of multiple transmission blocks (TBs). By means of implementing the embodiments of the present disclosure, the influence of LBT on communication quality can be reduced, and a solution can be provided for LBT in multi-continuous time slot transmission, if failure occurs.

Inventors

  • XIONG, YI

Assignees

  • Beijing Xiaomi Mobile Software Co., Ltd.

Dates

Publication Date
20260506
Application Date
20230629

Claims (20)

  1. A resource reselection method, comprising: triggering a resource reselection for a multiple consecutive slot transmission resource in response to a listen before talk (LBT) failure occurring on a first slot resource within the multiple consecutive slot transmission resource, wherein the multiple consecutive slot transmission resource comprises a plurality of consecutive slot resources for transmitting a plurality of transport blocks (TBs).
  2. The method according to claim 1, wherein triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: performing the resource reselection for the multiple consecutive slot transmission resource by using a preset parameter acquired from a physical layer; or performing the resource reselection for the multiple consecutive slot transmission resource by using a candidate resource set acquired from a physical layer, wherein the multiple consecutive slot transmission resource comprises a single slot resource or a multiple consecutive slot resource.
  3. The method according to claim 1 or 2, wherein the plurality of TBs are the same TB; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: a medium access control (MAC) layer submitting a first parameter to a physical layer, wherein the first parameter is used for the resource reselection for the multiple consecutive slot transmission resource; or acquiring a first candidate resource set for the TB from a physical layer, wherein a resource in the first candidate resource set is a single slot resource; and selecting the multiple consecutive slot transmission resource for the TB in the first candidate resource set, wherein the multiple consecutive slot transmission resource selected comprises an initial transmission resource and a retransmission resource of the TB.
  4. The method according to claim 1 or 2, wherein the plurality of TBs are the same TB; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: an MAC layer submitting a second parameter to a physical layer, wherein the second parameter is used for the resource reselection for the multiple consecutive slot transmission resource; or acquiring a second candidate resource set for the TB from a physical layer, wherein a resource in the second candidate resource set is a multiple consecutive slot resource; and selecting the multiple consecutive slot transmission resource for the TB in the second candidate resource set, wherein the multiple consecutive slot transmission resource selected comprises a multiple consecutive slot initial transmission resource and a multiple consecutive slot retransmission resource of the TB.
  5. The method according to claim 1, wherein triggering the resource reselection for the multiple consecutive slot transmission resource comprises: triggering the resource reselection for the multiple consecutive slot transmission resource in response to satisfying a first reselection condition after the LBT failure occurs on the first slot resource; or continuing to perform LBT on other slot resources in response to not satisfying the first reselection condition after the LBT failure occurs on the first slot resource.
  6. The method according to claim 5, further comprising: performing the LBT on the other slot resources within the multiple consecutive slot transmission resource according to a first order, and in response to satisfying the first reselection condition, triggering the resource reselection for the multiple consecutive slot transmission resource.
  7. The method according to claim 1, 5, or 6, wherein the plurality of TBs are the same TB; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises: after the LBT failure occurs on the first slot resource, triggering the resource reselection for the multiple consecutive slot transmission resource in response to satisfying a first reselection condition; or continuing to perform the LBT on a second slot resource within the multiple consecutive slot transmission resource in response to not satisfying a first reselection condition, and determining whether to trigger the resource reselection for the multiple consecutive slot transmission resource according to a result of the LBT on the second slot resource and the first reselection condition.
  8. The method according to claim 7, wherein determining whether to trigger the resource reselection for the multiple consecutive slot transmission resource according to the result of the LBT on the second slot resource comprises: in response to the LBT failure occurring on the second slot resource, continuing to perform the LBT on a next slot resource, wherein the next slot resource is a slot resource adjacent to a previous slot resource on which the LBT failure occurred within the multiple consecutive slot transmission resource; and triggering the resource reselection for the multiple consecutive slot transmission resource in response to satisfying the first reselection condition.
  9. The method according to any one of claims 1 to 8, wherein the plurality of TBs are a plurality of identical TBs; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises: continuing to perform the LBT on a next slot resource until a first reselection condition is satisfied, wherein the next slot resource is a slot resource adjacent to a previous slot resource on which the LBT failure occurred within the multiple consecutive slot transmission resource; and triggering the resource reselection for the multiple consecutive slot transmission resource.
  10. The method according to any one of claims 3 to 9, wherein the first reselection condition comprises a number of available consecutive slots within the multiple consecutive slot transmission resource is less than or equal to a first threshold, or the LBT failure occurs on all slot resources within the multiple consecutive slot transmission resource.
  11. The method according to claim 1 or 2, wherein the plurality of TBs are a plurality of different TBs; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises: for each of the plurality of different TBs, triggering the resource reselection for the multiple consecutive slot transmission resource.
  12. The method according to claim 1, 2, or 11, wherein for each of the plurality of different TBs, triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: an MAC layer submitting a first parameter corresponding to each TB to a physical layer, wherein the first parameter corresponding to each TB is used for the resource reselection for the corresponding TB; acquiring, from the physical layer, a third candidate resource set corresponding to each TB, wherein a resource in the third candidate resource set is a single slot resource; or performing resource selection or reselection in the third candidate resource set corresponding to each TB to determine the multiple consecutive slot transmission resource for the plurality of different TBs, wherein a resource selected comprises an initial transmission resource and a retransmission resource of each TB.
  13. The method according to claim 1, 2, or 11, wherein for each of the plurality of different TBs, triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: an MAC layer submitting a second parameter corresponding to each TB to a physical layer, wherein the second parameter corresponding to each TB is used for the resource reselection for the corresponding TB; acquiring, from the physical layer, a fourth candidate resource set corresponding to each TB, wherein a resource in the fourth candidate resource set is a multiple consecutive slot resource; or performing resource selection or reselection in the fourth candidate resource set corresponding to each TB to determine the multiple consecutive slot transmission resource for the plurality of different TBs, wherein a resource selected comprises a multiple consecutive slot initial transmission resource and a multiple consecutive slot retransmission resource of each TB.
  14. The method according to claim 1, 5, or 6, wherein the plurality of TBs are a plurality of different TBs; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises at least one of: an MAC layer submitting a second parameter corresponding to the plurality of TBs to a physical layer, wherein the second parameter corresponding to the plurality of TBs is used for the resource reselection for the plurality of different TBs; acquiring, from the physical layer, a fifth candidate resource set corresponding to the plurality of different TBs, wherein a resource in the fifth candidate resource set is a multiple consecutive slot resource; or selecting the multiple consecutive slot transmission resource for the plurality of different TBs in the fifth candidate resource set, wherein the multiple consecutive slot transmission resource selected comprises a multiple consecutive slot initial transmission resource and a multiple consecutive slot retransmission resource of the plurality of different TBs.
  15. The method according to claim 1, 5, or 6, wherein the plurality of TBs are a plurality of different TBs; and triggering the resource reselection for the multiple consecutive slot transmission resource comprises: continuing to perform the LBT on a first slot resource within a next multiple consecutive slot transmission resource, wherein the next multiple consecutive slot transmission resource is a next multiple consecutive slot transmission resource adjacent to a previous multiple consecutive slot transmission resource on which the LBT failure occurred, for transmitting the plurality of different TBs; and triggering the resource reselection for the multiple consecutive slot transmission resource in response to satisfying a second reselection condition.
  16. The method according to any one of claims 12 to 15, wherein a second reselection condition comprises a number of available multiple consecutive slot transmission resources being less than or equal to a first threshold, or the LBT failure occurring on the first slot resource within all multiple consecutive slot transmission resources.
  17. The method according to claim 3 or 12, wherein the first parameter comprises at least one of: a remaining packet delay budget (PDB); a number of subchannels L subCH for a physical sidelink shared channel (PSSCH) transmission in one subframe; a resource reservation interval P rsvp_TX for a PSSCH transmission; or priority information prio TX for a PSSCH transmission.
  18. The method according to claim 4, 13, or 14, wherein the second parameter comprises at least one of: a remaining PDB; a number of subchannels L subCH for a PSSCH transmission in one subframe; a resource reservation interval P rsvp_TX for a PSSCH transmission; priority information prio TX of a PSSCH transmission; or a number of slots for a multiple consecutive slot transmission.
  19. The method according to claim 10 or 16, further comprising: determining the first threshold by the MAC layer.
  20. The method according to claim 19, wherein the first threshold is N times a number of slots for a multiple consecutive slot transmission.

Description

FIELD The present disclosure relates to the field of communication technology, and in particular to a resource reselection method and apparatus. BACKGROUND Sidelink (SL) communication may use unlicensed spectrum (also called shared frequency band). A terminal device also needs to listen to talk (LBT) when sending SL data on unlicensed spectrum. The consecutive LBT failure mechanism is also applicable to the SL communication on the unlicensed spectrum. A multiple consecutive slot transmission (MCSt) reduces the influence of the LBT on communication quality by transmitting over multiple consecutive slots. The terminal device may successfully perform the LBT once and transmit over the multiple consecutive slots. However, there is currently a lack of effective means to solve how to handle the LBT failure of the multiple consecutive slot transmission. SUMMARY Embodiments of the present disclosure provide a resource reselection method and apparatus. According to a first aspect of embodiments of the present disclosure, there is provided a resource reselection method, which includes: triggering a resource reselection for a multiple consecutive slot transmission resource in response to a listen before talk (LBT) failure occurring on a first slot resource within the multiple consecutive slot transmission resource, in which the multiple consecutive slot transmission resource includes a plurality of consecutive slot resources for transmitting a plurality of transport blocks (TBs). According to a second aspect of embodiments of the present disclosure, there is provided a resource reselection apparatus, which includes: a processing module configured to trigger a resource reselection for a multiple consecutive slot transmission resource in response to a listen before talk (LBT) failure occurring on a first slot resource within the multiple consecutive slot transmission resource, in which the multiple consecutive slot transmission resource includes a plurality of consecutive slot resources for transmitting a plurality of transport blocks (TBs). According to a third aspect of embodiments of the present disclosure, there is provided a terminal device, which includes: one or more processors,in which the processor is configured to invoke instructions to cause the terminal device to perform the resource reselection method of the first aspect. According to a fourth aspect of embodiments of the present disclosure, there is provided a storage medium storing instructions that, when executed by a terminal device, cause the terminal device to perform the resource reselection method of the first aspect. According to the technical solution of the present disclosure, the influence of LBT on communication quality may be reduced, and a solution may be provided if the LBT for the multiple consecutive slot transmission fails. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly explain the technical solutions in embodiments of the present disclosure, the accompanying drawings necessary for the description of the embodiments are described below, and the following drawings are only some embodiments of the present disclosure, and do not specifically limit the scope of protection of the present disclosure. FIG. 1 is a flow chart of a resource reselection method provided by an embodiment of the present disclosure.FIG. 2 is an example diagram of multiple consecutive slot transmission resources for transmitting three identical TB1 provided by an embodiment of the present disclosure.FIG. 3 is a first example diagram of multiple consecutive slot transmission resources for transmitting four different TB1 provided by an embodiment of the present disclosure.FIG. 4 is a second example diagram of multiple consecutive slot transmission resources for transmitting four different TB1 provided by an embodiment of the present disclosure.FIG. 5 is a block diagram of a communication apparatus provided by an embodiment of the present disclosure.FIG. 6 is a block diagram of a terminal device 600 provided by an embodiment of the present disclosure.FIG. 7 is a block diagram of a chip 700 provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE DISCLOSURE Embodiments of the present disclosure provide a resource reselection method and apparatus. According to a first aspect, embodiments of the present disclosure provide a resource reselection method, and the method includes: triggering a resource reselection for a multiple consecutive slot transmission resource in response to a listen before talk (LBT) failure occurring on a first slot resource within the multiple consecutive slot transmission resource, in which the multiple consecutive slot transmission resource includes a plurality of consecutive slot resources for transmitting a plurality of transport blocks (TBs). In above embodiments, in a case where the LBT on the multiple consecutive slot transmission resource fails, the terminal device triggers the resource reselection for the mult