Method and device for determining priority of UL transmission in NR V2X
A method for performing wireless communication by a first device, and a device for supporting same are provided. The method may comprise: transmitting, to a second device, at least one physical sidelink control channel (PSCCH) and at least one physical sidelink shared channel (PSSCH) related to the at least one PSCCH; receiving, from the second device, at least one sidelink (SL) hybrid automatic repeat request (HARQ) feedback information through at least one physical sidelink feedback channel (PSFCH) related to the at least one PSSCH; and determining a priority value of physical uplink control channel (PUCCH) transmission for reporting the at least one SL HARQ feedback information to a base station, based on at least one priority value of the at least one SL HARQ feedback information.
1. A method for performing wireless communication by a first device, the method comprising:
transmitting a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), each being related to a corresponding one of the PSCCHs;
determining at least one physical sidelink feedback channel (PSFCH) resource related to the plurality of PSSCHs;
obtaining sidelink (SL) hybrid automatic repeat request (HARQ) feedback information related to each of the plurality of PSSCHs; and
determining a priority value of a physical uplink control channel (PUCCH), based on the SL HARQ feedback information, wherein the priority value of the PUCCH is determined to be a smallest priority value among a plurality of priority values corresponding to the plurality of PSSCHs, and whether the PUCCH is or is not transmitted is based on the determined priority value of the PUCCH.
2. The method of claim 1 , wherein the priority value of the PUCCH transmission is a smallest value among a plurality of priority values of the SL HARQ feedback information.
3. The method of claim 2 , further comprising:
determining the plurality of priority values of the SL HARQ feedback information, wherein the plurality of priority values of the SL HARQ feedback information are the same as plurality of priority values related to transmission of the plurality of PSSCHs.
4. The method of claim 3 , wherein the plurality of priority values related to transmission of the plurality of PSSCHs are included in sidelink control information (SCI) transmitted through the plurality of PSCCHs.
5. The method of claim 1 , further comprising:
performing the PUCCH transmission or a SL transmission based on the priority value of the PUCCH transmission and a priority value of the SL transmission, wherein the PUCCH transmission and the SL transmission overlap in a time domain.
6. The method of claim 5 , wherein, based on the priority value of the PUCCH transmission being smaller than the priority value of the SL transmission, the PUCCH is transmitted to the base station.
7. The method of claim 5 , wherein, based on (i) the priority value of the PUCCH transmission being smaller than the priority value of the SL transmission and (ii) a sum of power related to the PUCCH transmission and power related to the SL transmission exceeding a maximum transmit power of the first device, the power related to the SL transmission is reduced such that the sum does not exceed the maximum transmit power of the first device.
8. The method of claim 5 , wherein, based on the priority value of the PUCCH transmission being larger than the priority value of the SL transmission, the SL transmission is performed.
9. The method of claim 5 , wherein, based on (i) the priority value of the PUCCH transmission being larger than the priority value of the SL transmission, and (ii) a sum of power related to the PUCCH transmission and power related to the SL transmission exceeding a maximum transmit power of the first device, the power related to the PUCCH transmission is reduced such that the sum does not exceed the maximum transmit power of the first device.
10. The method of claim 1 , further comprising:
transmitting a physical random access channel (PRACH) to the base station.
11. The method of claim 10 , wherein a priority related to transmission of the PRACH is higher than a priority related to transmission of a PSFCH.
12. The method of claim 10 , wherein a priority related to transmission of the PRACH is higher than a priority related to transmission of a sidelink-synchronization signal block (S-SSB).
13. The method of claim 1 , further comprising:
receiving information related to a SL resource from the base station.
14. A first device configured to perform 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:
transmit a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), each being related to a corresponding one of the PSCCHs;
determine at least one physical sidelink feedback channel (PSFCH) resource related to the plurality of PSSCHs;
obtain sidelink (SL) hybrid automatic repeat request (HARQ) feedback information related to each of the plurality of PSSCHs; and
determine a priority value of a physical uplink control channel (PUCCH), based on SL HARQ feedback information, wherein the priority value of the PUCCH is determined to be a smallest priority value among a plurality of priority values corresponding to the plurality of PSSCHs, and whether the PUCCH is or is not transmitted is based on the determined priority value of the PUCCH.
15. The first device of claim 14 , wherein the priority value of the PUCCH transmission is a smallest value among a plurality of priority values of the SL HARQ feedback information.
16. The first device of claim 15 ,
wherein the one or more processors further execute the instructions to determine the plurality of priority values of the SL HARQ feedback information, and
wherein the plurality of priority values of the SL HARQ feedback information are the same as plurality of priority values related to transmission of the plurality of PSSCHs.
17. The first device of claim 16 , wherein the plurality of priority values related to transmission of the at least one PSSCH is plurality of PSSCHs are included in sidelink control information (SCI) transmitted through the plurality of PSCCHs.
18. The first device of claim 14 , wherein the one or more processors further execute the instructions to perform the PUCCH transmission or a SL transmission based on the priority value of the PUCCH transmission and a priority value of the SL transmission, wherein the PUCCH transmission and the SL transmission overlap in a time domain.
19. The first device of claim 18 , wherein, based on the priority value of the PUCCH transmission being smaller than the priority value of the SL transmission, the PUCCH is transmitted to the base station.
20. An apparatus configured to control a first user equipment (UE) performing wireless communication, the apparatus comprising:
one or more processors; and
one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
transmit a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), each being related to a corresponding one of the PSCCHs;
determine at least one physical sidelink feedback channel (PSFCH) resource related to the plurality of PSSCHs;
obtain sidelink (SL) hybrid automatic repeat request (HARQ) feedback information related to each of the plurality of PSSCHs; and
determine a priority value of a physical uplink control channel (PUCCH), based on SL HARQ feedback information, wherein the priority value of the PUCCH is determined to be a smallest priority value among a plurality of priority values corresponding to the plurality of PSSCHs, and whether the PUCCH is or is not transmitted is based on the determined priority value of the PUCCH.