Operation method of UE related to sidelink DRX timer in wireless communication system
One embodiment relates to a method for sidelink related operation of a receiving (RX) user equipment (UE) in a wireless communication system, the method comprising the steps in which: the RX UE receives first SCI from a transmitting UE (TX UE) through a physical sidelink control channel (PSCCH); and the RX UE receives a physical sidelink shared channel (PSSCH) and second SCI from the TX UE on the basis of the first SCI, wherein the second SCI includes information about activating physical sidelink feedback channel (PSFCH) transmission related to the PSSCH, and whether to start a retransmission timer on the basis of the PSFCH transmission being dropped is determined on the basis of whether the dropped PSFCH transmission is related to either NACK or ACK.
1. A method performed by a first User Equipment (UE) in a wireless communication system, the method comprising:
receiving, by the first UE, first control information from a second UE over a physical control channel; and
receiving, by the first UE, second control information included in a physical data channel from the second UE, based on the first control information,
wherein the second control information includes information for enabling a Hybrid Automatic Repeat Request (HARQ) feedback for the physical data channel,
wherein based on the HARQ feedback being not transmitted and being Negative Acknowledgement (NACK), the first UE starts a retransmission timer related to a Discontinuous Reception (DRX) between the first UE and the second UE, and
wherein, based on the HARQ feedback being not transmitted and being ACK, the first UE does not start the retransmission timer related to the DRX.
2. The method of claim 1 , wherein a round trip time (RTT) timer is started based on a resource for the HARQ feedback.
3. The method of claim 1 , wherein the physical data channel is related to unicast.
4. The method of claim 1 , wherein a round trip time (RTT) timer is related to transition to a sleep mode after the HARQ feedback transmission.
5. The method of claim 1 , wherein the retransmission timer is related to receiving a retransmission from the second UE based on the HARQ feedback.
6. The method of claim 1 , wherein the first UE is configured to maintain a wake-up state during the retransmission timer.
7. The method of claim 1 , wherein the physical data channel is related to groupcast.
8. A first user equipment (first UE) configured to operate in a wireless communication system, the first UE comprising:
at least one processor; and
at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving a first control information from a second UE through a physical control channel; and
receiving second control information included in a physical data channel from the second UE, based on the first control information,
wherein the second control information includes information for enabling a Hybrid Automatic Repeat Request (HARQ) feedback for the physical data channel,
wherein based on the HARQ feedback being not transmitted and being Negative Acknowledgement (NACK), the first UE starts a retransmission timer related to a Discontinuous Reception (DRX) between the first UE and the second UE, and
wherein, based on the HARQ feedback being not transmitted and being ACK, the first UE does not start the retransmission timer related to the DRX.
9. The first UE of claim 8 , wherein the first UE is configured to communicate with at least one of another user equipment (UE), a UE related to an autonomous vehicle, a base station, or a network.
10. A non-transitory computer-readable storage medium configured to store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a first user equipment (first UE), the operations comprising:
receiving a first control information from a second UE through a physical control channel; and
receiving second control information included in a physical data channel from the second UE, based on the first control information,
wherein the second control information includes information for enabling a Hybrid Automatic Repeat Request (HARQ) feedback for the physical data channel,
wherein based on the HARQ feedback being not transmitted and being Negative Acknowledgement (NACK), the first UE starts a retransmission timer related to a Discontinuous Reception (DRX) between the first UE and the second UE, and
wherein, based on the HARQ feedback being not transmitted and being ACK, the first UE does not start the retransmission timer related to the DRX.