US-12621804-B2 - Method and device for selecting resource on basis of LCH in NR V2X

US12621804B2US 12621804 B2US12621804 B2US 12621804B2US-12621804-B2

Abstract

An embodiment proposes a method for performing wireless communication by a first device. The method may comprise the steps of: selecting a first resource within a first selection window on the basis of first sensing; generating a first medium access control (MAC) protocol data unit (PDU) on the basis of at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled; transmitting, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), on the basis of the first resource; and transmitting, to the second device, second SCI and the first MAC PDU, through the first PSSCH, on the basis of the first resource. For example, random selection of the first resource may not be allowed on the basis of the at least one LCH in which the HARQ feedback is enabled.

Inventors

Seungmin Lee
Jongwoo Hong
Seoyoung Back
Giwon Park

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260505
Application Date: 20211216
Priority Date: 20201216

Claims (14)

1 . A method comprising: selecting a first resource within a first selection window, based on first sensing; generating a first medium access control (MAC) protocol data unit (PDU) based on at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled, wherein a first LCH with a highest priority and a second LCH with the highest priority are included in the at least one LCH, and wherein whether sidelink (SL) discontinuous reception (DRX) is applied to the first MAC PDU is determined based on SL DRX being enabled to the first LCH with a minimum required communication distance longer than the second LCH; transmitting, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), based on the first resource; and transmitting, to the second device, second SCI and the first MAC PDU, through the first PSSCH, based on the first resource, wherein random selection for the first resource is not allowed, based on HARQ feedback being enabled in the at least one LCH.
2 . The method of claim 1 , further comprising: receiving a HARQ feedback for the first MAC PDU through a physical sidelink feedback channel (PSFCH), wherein the first sensing includes partial sensing.
3 . The method of claim 2 , wherein second sensing for selecting a second resource for retransmitting the first MAC PDU is performed, based on the HARQ feedback being negative-acknowledgement (NACK), wherein the second resource is selected within a second selection window based on the second sensing.
4 . The method of claim 1 , wherein the priority of the first LCH is a higher priority than a pre-configured threshold.
5 . The method of claim 1 , wherein remaining amount of a battery is greater than a pre-configured threshold.
6 . The method of claim 1 , wherein a channel busy ratio (CBR) measurement value of a resource pool related to the first LCH is greater than a pre-configured threshold.
7 . The method of claim 1 , further comprising: transmitting, to the second device, third SCI for scheduling of a second PSSCH, through a second PSCCH; and transmitting, to the second device, fourth SCI and a second MAC PDU, through the second PSSCH, wherein the second MAC PDU is generated based on at least one LCH in which HARQ feedback is disabled.
8 . The method of claim 7 , wherein sensing for a third resource for transmitting the second MAC PDU is allowed, based on a priority related to the second MAC PDU being a priority higher than a pre-configured threshold.
9 . The method of claim 7 , wherein random selection for a third resource for transmitting the second MAC PDU is allowed.
10 . The method of claim 7 , wherein sensing and random selection for a third resource for transmitting the second MAC PDU are allowed.
11 . The method of claim 10 , wherein the third resource is selected, based on resource selection type for the at least one LCH in which HARQ feedback is disabled, and wherein the resource selection type includes a type of selecting a resource by sensing and a type of selecting a resource by random selection.
12 . The method of claim 11 , wherein the resource selection type is configured based on a sidelink service from a higher layer.
13 . A first device comprising: one or more processors; one or more transceivers; and one or more memories connected to the one or more processors and storing instructions, wherein the instructions, based on being executed by the one or more processors, cause the first device to: select a first resource within a first selection window, based on first sensing; generate a first medium access control (MAC) protocol data unit (PDU) based on at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled, wherein a first LCH with a highest priority and a second LCH with the highest priority are included in the at least one LCH, and wherein whether sidelink (SL) discontinuous reception (DRX) is applied to the first MAC PDU is determined based on SL DRX being enabled to the first LCH with a minimum required communication distance longer than the second LCH; transmit, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), based on the first resource; and transmit, to the second device, second SCI and the first MAC PDU, through the first PSSCH, based on the first resource, wherein random selection for the first resource is not allowed, based on HARQ feedback being enabled in the at least one LCH.
14 . A processing device adapted to control a first device, the processing device comprising: one or more processors; and one or more memories connected to the one or more processors and storing instructions, wherein the instructions, based on being executed by the one or more processors, cause the first device to: select a first resource within a first selection window, based on first sensing; generate a first medium access control (MAC) protocol data unit (PDU) based on at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled, wherein a first LCH with a highest priority and a second LCH with the highest priority are included in the at least one LCH, and wherein whether sidelink (SL) discontinuous reception (DRX) is applied to the first MAC PDU is determined based on SL DRX being enabled to the first LCH with a minimum required communication distance longer than the second LCH; transmit, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), based on the first resource; and transmit, to the second device, second SCI and the first MAC PDU, through the first PSSCH, based on the first resource, wherein random selection for the first resource is not allowed, based on HARQ feedback being enabled in the at least one LCH.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2021/019227, filed on Dec. 16, 2021, which claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2020-0176688, filed on Dec. 16, 2020, the contents of which are all incorporated by reference herein in their entirety. TECHNICAL FIELD This disclosure relates to a wireless communication system. BACKGROUND Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into 4 types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface. Meanwhile, as a wider range of communication devices require larger communication capacities, the need for mobile broadband communication that is more enhanced than the existing Radio Access Technology (RAT) is rising. Accordingly, discussions are made on services and user equipment (UE) that are sensitive to reliability and latency. And, a next generation radio access technology that is based on the enhanced mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), and so on, may be referred to as a new radio access technology (RAT) or new radio (NR). Herein, the NR may also support vehicle-to-everything (V2X) communication. SUMMARY On the other hand, in sidelink communication, when establishing a pool to a UE, whether random selection or partial sensing is performed may always be configured. In this case, for example, if a UE performs random selection or partial sensing, a parameter related to enabling sidelink hybrid automatic repeat request (SL HARQ) feedback (e.g., sl-HARQ-FeedbackEnabled) is enabled and a physical sidelink feedback channel (PSFCH) is configured, the UE may perform SL HARQ feedback operation. For example, if a UE performs random selection, there are no sensing results, so the UE may have a problem with retransmission judgment if there is a collision when receiving ACK/NACK based on PSFCH resources. BRIEF DESCRIPTION OF THE DRAWINGS According to an embodiment of the present disclosure, a method for performing, by a first device, wireless communication may be proposed. The method may comprise: selecting a first resource within a first selection window, based on first sensing; generating a first medium access control (MAC) protocol data unit (PDU) based on at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled; transmitting, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), based on the first resource; and transmitting, to the second device, second SCI and the first MAC PDU, through the first PSSCH, based on the first resource. For example, random selection for the first resource may be not allowed, based on HARQ feedback being enabled in the at least one LCH. According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: select a first resource within a first selection window, based on first sensing; generate a first medium access control (MAC) protocol data unit (PDU) based on at least one logical channel (LCH) in which hybrid automatic repeat request (HARQ) feedback is enabled; transmit, to a second device, first sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH), through a first physical sidelink control channel (PSCCH), based on the first resource; and transmit, to the second device, second SCI and the first MAC PDU, through the first PSSCH, based on the first resource. For example, random selection for the first resource may be not allowed, based on HARQ feedback being enabled in the at least one LCH. According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) may be proposed. For example, the device may comprise