Method and apparatus for performing SL DRX operation in NR V2X

A 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 by the at least one processor, cause a first device to perform operations comprising:
• obtaining an inter-user equipment (inter-UE) link discontinuous reception (DRX) configuration including an inter-UE DRX inactivity timer, an inter-UE DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer, and an inter-UE DRX retransmission timer;
• receiving first inter-UE control information for scheduling of a first inter-UE physical shared channel and second inter-UE control information from a second device through a first inter-UE physical control channel;
• receiving the second inter-UE control information and a first medium access control (MAC) protocol data unit (PDU) from the second device through the first inter-UE physical shared channel;
• starting the inter-UE DRX inactivity timer;
• transmitting inter-UE HARQ feedback information to the second device through an inter-UE physical feedback channel on an inter-UE physical feedback channel resource determined based on a slot index and a sub-channel index related to the first inter-UE physical shared channel;
• and
• based on that the second inter-UE control information is related to groupcast, restarting the inter-UE DRX inactivity timer after the SCI is related to groupcast inter-UE physical feedback channel resource.

A method comprising:

• obtaining, by a second device, an inter-user equipment (inter-UE) link discontinuous reception (DRX) configuration including an inter-UE DRX inactivity timer, an inter-UE DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer, and an inter-UE DRX retransmission timer;
• transmitting, by the second device, first inter-UE control information for scheduling of a first inter-UE physical shared channel and second inter-UE control information to a first device through a first inter-UE physical control channel;
• transmitting, by the second device, the second inter-UE control information and a first medium access control (MAC) protocol data unit (PDU) to the first device through the first inter-UE physical shared channel;
• starting, by the second device, the inter-UE DRX inactivity timer;
• receiving, by the second device, inter-UE HARQ feedback information from the first device through an inter-UE physical feedback channel on an inter-UE physical feedback channel resource determined based on a slot index and a sub-channel index related to the first inter-UE physical shared channel;
• and
• based on that the second inter-UE control information is related to groupcast, restarting, by the second device, the inter-UE DRX inactivity timer after the inter-UE physical feedback channel resource.