Method and device for configuring SL HARQ RTT timer in NR V2X

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

• 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, wherein the one or more processors execute the instructions to:
• obtain a sidelink (SL) discontinuous reception (DRX) configuration including a value of a SL DRX retransmission timer;
• control the one or more transceivers to receive, from a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of second SCI and a physical sidelink shared channel (PSSCH);
• control the one or more transceivers to receive, from the second device through the PSSCH, the second SCI and data;
• determine a value of a SL DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer as zero, based on that information related to a next retransmission resource is not included in the first SCI;
• and
• start the SL DRX retransmission timer.

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

• one or more processors;
• and
• one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
• obtain a sidelink (SL) discontinuous reception (DRX) configuration including a value of a SL DRX retransmission timer;
• receive, from a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of second SCI and a physical sidelink shared channel (PSSCH);
• receive, from the second device through the PSSCH, the second SCI and data;
• determine a value of a SL DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer as zero, based on that information related to a next retransmission resource is not included in the first SCI;
• and
• start the SL DRX retransmission timer.