Method and device for performing SL DRX operation in NR V2X
Disclosed is a method for operating a first device ( 100 ) in a wireless communication system. The method may comprise the steps in which: resource selection for a resource included in an active time of a sidelink (SL) discontinuous reception (DRX) configuration is performed on the basis of a second device ( 200 ) performing SL communication on the basis of the SL DRX configuration; and information related to the resource selected on the basis of the resource selection is transmitted to the second device ( 200 ).
1. A method for performing, by a first device, wireless communication, the method comprising:
receiving, from a base station, information related to a physical uplink control channel (PUCCH) transmission occasion for sidelink (SL);
receiving, from the base station, an SL grant related to the PUCCH transmission occasion, including a retransmission resource for a transmission to a second device;
generating a medium access control (MAC) protocol data unit (PDU) to be retransmitted based on the SL grant;
obtaining SL discontinuous reception (DRX) configuration of the second device;
determining that the retransmission resource is not in an active time of the SL DRX configuration; and
transmitting, to the base station, negative acknowledge (NACK) through the PUCCH transmission occasion.
2. The method of claim 1 , wherein a priority value related to the NACK is the same as a priority value related to the MAC PDU.
3. The method of claim 1 , wherein the second device is a power saving user equipment (UE).
4. The method of claim 1 , wherein the retransmission of the MAC PDU is allowed based on a priority value related to the MAC PDU being smaller than a threshold.
5. The method of claim 4 , wherein the retransmission of the MAC PDU is allowed based on congestion level of the retransmission resource being higher than threshold level and the priority value being smaller than the threshold.
6. The method of claim 1 , further comprising:
receiving, from the second device, the SL DRX configuration.
7. The method of claim 6 , wherein the SL DRX configuration is an updated SL DRX configuration.
8. A first device for performing 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:
receive, from a base station, information related to a physical uplink control channel (PUCCH) transmission occasion for sidelink (SL);
receive, from the base station, an SL grant related to the PUCCH transmission occasion, including a retransmission resource for a transmission to a second device;
generate a medium access control (MAC) protocol data unit (PDU) to be retransmitted based on the SL grant;
obtain SL discontinuous reception (DRX) configuration of the second device;
determine that the retransmission resource is not in an active time of the SL DRX configuration; and
transmit, to the base station, negative acknowledge (NACK) through the PUCCH transmission occasion.
9. 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 base station, information related to a physical uplink control channel (PUCCH) transmission occasion for sidelink (SL);
receive, from the base station, an SL grant related to the PUCCH transmission occasion, including a retransmission resource for a transmission to a second UE;
generate a medium access control (MAC) protocol data unit (PDU) to be retransmitted based on the SL grant;
obtain SL discontinuous reception (DRX) configuration of the second UE;
determine that the retransmission resource is not in an active time of the SL DRX configuration; and
transmit, to the base station, negative acknowledge (NACK) through the PUCCH transmission occasion.