Method and device for performing SL DRX operation on basis of HARQ feedback in NR V2X

A first device adapted to perform wireless communication, the first device comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the at least one processor to perform operations comprising:
• obtaining a sidelink (SL) discontinuous reception (DRX) configuration including information related to a first SL DRX timer;
• receiving, from a second device through a first physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a first physical sidelink shared channel (PSSCH) and second SCI;
• receiving, from the second device through the first PSSCH, the second SCI and first data, and
• determining a first physical sidelink feedback channel (PSFCH) resource related to the first PSSCH,
• wherein the first SL DRX timer is started based on that first SL hybrid automatic repeat request (HARQ) feedback is not transmitted on the first PSFCH resource.

A processing device adapted to control a first device, the processing device comprising:

• at least one processor;
• and
• at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the at least one processor to perform operations comprising:
• obtaining a sidelink (SL) discontinuous reception (DRX) configuration including information related to a first SL DRX timer;
• receiving, from a second device through a first physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a first physical sidelink shared channel (PSSCH) and second SCI;
• receiving, from the second device through the first PSSCH, the second SCI and first data;
• and
• determining a first physical sidelink feedback channel (PSFCH) resource related to the first PSSCH,
• wherein the first SL DRX timer is started based on that first SL hybrid automatic repeat request (HARQ) feedback is not transmitted on the first PSFCH resource.