Method for operating SL DRX in consideration of mode 1 operation of transmission terminal in NR V2X

A 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:
• receive, from a second device, a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX onduration timer, information related to a SL DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer and information related to a SL DRX retransmission timer,
• wherein a time duration that the SL DRX onduration timer or the SL DRX retransmission timer runs is included in an active time of the first device;
• receive, from the second device, information related to whether a physical uplink control channel (PUCCH) resource is configured and information related to resource allocation mode;
• determine a value of the SL DRX HARQ RTT timer, based on the information related to whether a PUCCH resource is configured and the information related to resource allocation mode;
• receive, from the second device, sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH), through physical sidelink control channel (PSCCH), in the active time,
• wherein the SCI includes resource information related to a first resource in which the SCI is received and a second resource after the first resource, and
• wherein the second resource exists within a time duration after expiration of the SL DRX onduration timer;
• determine decoding failure for a medium access control (MAC) protocol data unit (PDU) transmitted, from the second device, through the PSSCH;
• transmit, to the second device, HARQ negative acknowledge (NACK) related to the MAC PDU through a physical sidelink feedback channel (PSFCH) related to the PSSCH, based on the decoding failure;
• start the SL DRX HARQ RTT timer based on the value;
• start the SL DRX retransmission timer, based on expiration of the SL DRX HARQ RTT timer;
• and
• receive, from the second device, a retransmission of the MAC PDU based on a retransmission resource.

A device adapted to control a first user equipment (UE), the device comprising:

• one or more processors;
• and
• one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
• receive, from a second UE, a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX onduration timer, information related to a SL DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer and information related to a SL DRX retransmission timer,
• wherein a time duration that the SL DRX onduration timer or the SL DRX retransmission timer runs is included in an active time of the first device;
• receive, from the second UE, information related to whether a physical uplink control channel (PUCCH) resource is configured and information related to resource allocation mode;
• determine a value of the SL DRX HARQ RTT timer, based on the information related to whether a PUCCH resource is configured and the information related to resource allocation mode;
• receive, from the second device, sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH), through physical sidelink control channel (PSCCH), in the active time,
• wherein the SCI includes resource information related to a first resource in which the SCI is received and a second resource after the first resource, and
• wherein the second resource exists within a time duration after expiration of the SL DRX onduration timer;
• determine decoding failure for a medium access control (MAC) protocol data unit (PDU) transmitted, from the second device, through the PSSCH;
• transmit, to the second device, HARQ negative acknowledge (NACK) related to the MAC PDU through a physical sidelink feedback channel (PSFCH) related to the PSSCH, based on the decoding failure;
• start the SL DRX HARQ RTT timer based on the value;
• and
• start the SL DRX retransmission timer, based on expiration of the SL DRX HARQ RTT timer;
• and
• receive, from the second device, a retransmission of the MAC PDU based on a retransmission resource.