Method and apparatus for transmitting signal in wireless communication system
The present invention relates to a wireless communication system and, specifically, to a method and a wireless device therefor, the method comprising the steps of: for a plurality of SL transmissions within a slot, determining a CAPC value per each SL transmission; and for transmitting the plurality of SL transmissions in the slot, performing a Type 1 CAP on the basis of the highest CAPC value among a plurality of CAPC values associated with the plurality of SL transmissions.
1 . A user equipment (UE) configured to operate in a wireless communication system, the user equipment comprising:
a communication module; and
a processor controlling the communication module,
wherein the processor is configured to:
determine each channel access priority class (CAPC) value for each SL transmission for a plurality of sidelink (SL) transmissions within a slot; and
perform a Type 1 channel access procedure (CAP) based on a highest CAPC value among a plurality of CAPC values associated with the plurality of SL transmissions for transmitting the plurality of SL transmissions in the slot.
2 . The UE of claim 1 , wherein the plurality of CAPC values are associated with each contention window (CW) parameter, and the higher the CAPC value, the lower the channel access priority of the CW parameter.
3 . The UE of claim 1 , wherein the processor is configured to transmit the plurality of SL transmissions to each corresponding receiving UE when the Type 1 CAP is successful.
4 . The UE of claim 1 , wherein the plurality of SL transmissions correspond to two or more receiving UEs.
5 . The UE of claim 1 , wherein the plurality of SL transmissions are scheduled to be transmitted on the same time resources within the slot.
6 . The UE of claim 1 , wherein the plurality of SL transmissions are scheduled to be transmitted on different frequency resources within the slot.
7 . The UE of claim 6 , wherein the plurality of SL transmissions comprise multiple PSFCH transmissions on the different frequency resources within the slot, and
wherein a cell-specifically configured starting time position of PSFCH transmission is applied for the multiple PSFCH transmissions in the slot.
8 . The UE of claim 1 , wherein the plurality of SL transmissions comprise a physical sidelink feedback channel (PSFCH) transmission.
9 . The UE of claim 8 , wherein the CAPC value associated with SL transmission including the PSFCH transmission is fixed as a lowest CAPC value.
10 . The UE of claim 9 , wherein the CAPC value associated with the PSFCH transmission is determined based on the traffic priority of the physical sidelink shared channel (PSSCH) corresponding to the PSFCH transmission, and the traffic priority is determined based on a priority information within a sidelink control information (SCI) that schedules the PSSCH.
11 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
determining each channel access priority class (CAPC) value for each SL transmission for a plurality of sidelink (SL) transmissions within a slot; and
performing a Type 1 channel access procedure (CAP) based on a highest CAPC value among a plurality of CAPC values associated with the plurality of SL transmissions for transmitting the plurality of SL transmissions in the slot.
12 . The method of claim 11 , wherein the plurality of CAPC values are associated with each contention window (CW) parameter, and the higher the CAPC value, the lower the channel access priority of the CW parameter.
13 . The method of claim 11 , further comprising transmitting the plurality of SL transmissions to each corresponding receiving UE when the Type 1 CAP is successful.
14 . The method of claim 11 , wherein the plurality of SL transmissions correspond to two or more receiving UEs.
15 . The method of claim 11 , wherein the plurality of SL transmissions are scheduled to be transmitted on the same time resources within the slot.
16 . The method of claim 11 , wherein the plurality of SL transmissions are scheduled to be transmitted on different frequency resources within the slot.
17 . The method of claim 16 , wherein the plurality of SL transmissions comprise multiple PSFCH transmissions on the different frequency resources within the slot, and
wherein a cell-specifically configured starting time position of PSFCH transmission is applied for the multiple PSFCH transmissions in the slot.
18 . The method of claim 11 , wherein the plurality of SL transmissions comprise a physical sidelink feedback channel (PSFCH) transmission.
19 . The method of claim 18 , wherein the CAPC value associated with SL transmission including the PSFCH transmission is fixed as a lowest CAPC value.
20 . The method of claim 19 , wherein the CAPC value associated with the PSFCH transmission is determined based on the traffic priority of the physical sidelink shared channel (PSSCH) corresponding to the PSFCH transmission, and the traffic priority is determined based on a priority information within a sidelink control information (SCI) that schedules the PSSCH.