Method and device for supporting discontinuous reception of sidelink in wireless communication system

1 . A first user equipment (UE) for performing sidelink communication in a wireless communication system, the first UE comprising:

a transceiver; and

at least one processor coupled with the transceiver,

wherein the at least one processor is configured to:

obtain, through higher layer signaling, information regarding a method of handling a physical sidelink feedback channel (PSFCH) while performing a discontinuous reception (DRX),

transmit, to a second UE, a physical sidelink shared channel (PSSCH),

based on determination to receive or not receive the PSFCH according to the obtained information regarding the method of handling the PSFCH while performing the DRX, transmit, to the second UE, sidelink control information (SCI) including information requesting to transmit a PSFCH for the PSSCH, and

receive, from the second UE, the PSFCH for the PSSCH during a DRX active time if a slot for receiving the PSFCH determined based on PSFCH resource configuration information is in the DRX active time.

2 . The first UE of claim 1 , wherein the slot for receiving the PSFCH is defined always as the DRX active time.

3 . The first UE of claim 1 , wherein the at least one processor is configured to transmit, to the second UE, SCI including information requesting not to transmit the PSFCH for the PSSCH when the PSFCH is in a DRX inactive time.

4 . The first UE of claim 1 , wherein the at least one processor is configured to:

receive, from the second UE, the PSFCH for the PSSCH in the slot for receiving the PSFCH in a DRX inactive time when the slot for receiving the PSFCH for the PSSCH is in the DRX inactive time; and

receive no information other than the PSFCH in the slot for receiving the PSFCH present in the DRX inactive time.

5 . The first UE of claim 1 , wherein a resource for the PSSCH is selected so that reception of the PSFCH corresponding to the PSSCH is in the DRX active time.

6 . The first UE of claim 1 , wherein the at least one processor is configured to:

determine candidate resources of PSSCHs each having a corresponding PSFCH which is in the DRX active time among a plurality of PSSCHs; and

transmit the PSSCH among the candidate resources of the PSSCHs.

7 . The first UE of claim 1 , wherein the at least one processor is configured to receive the PSFCH for the PSSCH in a first PSFCH slot belonging to the DRX active time among slots after a minimum time gap between the PSSCH and the PSFCH from a slot for the PSSCH, when there is the slot for receiving the PSFCH in the DRX inactive time.

8 . A second user equipment (UE) for performing sidelink communication in a wireless communication system, the second UE comprising:

a transceiver; and

at least one processor coupled with the transceiver,

wherein the at least one processor is configured to:

receive, from a first UE, a physical sidelink shared channel (PSSCH),

based on determination of the first UE to receive or not receive a physical sidelink feedback channel (PSFCH) according to information regarding a method of handling the PSFCH while a discontinuous reception (DRX), receive, from the first UE, sidelink control information (SCI) including information requesting to transmit a PSFCH for the PSSCH, and

based on the SCI, transmit, to the first UE, the PSFCH for the PSSCH if a slot for the PSFCH determined based on PSFCH resource configuration information is in a DRX active time of the first UE,

wherein the information regarding the method of handling the PSFCH while the DRX is obtained at the first UE through higher layer signaling.

9 . The second UE of claim 8 , wherein the slot for receiving the PSFCH is defined always as the DRX active time of the first UE.

10 . The second UE of claim 8 , wherein the at least one processor is configured to receive, from the first UE, SCI including information requesting not to transmit the PSFCH for the PSSCH when the PSFCH is in a DRX inactive time of the first UE.

11 . The second UE of claim 8 , wherein the at least one processor is configured to:

transmit, to the first UE, the PSFCH for the PSSCH in the slot for the PSFCH in a DRX inactive time when the slot for the PSFCH for the PSSCH is in the DRX inactive time of the first UE; and

transmit no information other than the PSFCH in the slot for the PSFCH present in the DRX inactive time.

12 . The second UE of claim 8 , wherein the at least one processor is configured to transmit the PSFCH for the PSSCH in a first PSFCH slot belonging to the DRX active time of the first UE among slots after a minimum time gap between the PSSCH and the PSFCH from a slot for the PSSCH, when there is the slot for the PSFCH in the DRX inactive time of the first UE.

13 . An operation method of a first user equipment (UE) for performing sidelink communication in a wireless communication system, the operation method comprising:

obtaining, through higher layer signaling, information regarding a method of handling a physical sidelink feedback channel (PSFCH) while performing a discontinuous reception (DRX);

transmitting, to a second UE, a physical sidelink shared channel (PSSCH);

based on determination to receive or not receive the PSFCH according to the obtained information regarding the method of handling the PSFCH while performing the DRX,

transmitting, to the second UE, sidelink control information (SCI) including information requesting to transmit a PSFCH for the PSSCH; and

receiving, from the second UE, the PSFCH for the PSSCH during a DRX active time if a slot for receiving the PSFCH determined based on PSFCH resource configuration information is in the DRX active time.

14 . An operation method of a second user equipment (UE) for performing sidelink communication in a wireless communication system, the operation method comprising:

receiving, from a first UE, a physical sidelink shared channel (PSSCH),

based on determination of the first UE to receive or not receive a physical sidelink feedback channel (PSFCH) according to information regarding a method of handling the PSFCH while a discontinuous reception (DRX), receiving, from the first UE, sidelink control information (SCI) including information requesting to transmit a PSFCH for the PSSCH; and

based on the SCI, transmitting, to the first UE, the PSFCH for the PSSCH if a slot for the PSFCH determined based on PSFCH resource configuration information is in a DRX active time of the first UE,

wherein the information regarding the method of handling the PSFCH while the DRX is obtained at the first UE through higher layer signaling.