Method and apparatus for reporting HARQ feedback to base station 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: receiving, from a base station, information related to a physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information and information related to a first sidelink (SL) resource; generating the HARQ feedback information based on first SL transmission being not performed on the first SL resource by the first device; and determining a priority value of the HARQ feedback information, wherein the priority value of the HARQ feedback information is a same as a largest priority value among at least one priority value related to the first SL resource.
1. A method for performing wireless communication by a first device, the method comprising:
receiving, from a base station, information related to a physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information and information related to a first sidelink (SL) resource;
generating the HARQ feedback information based on first SL transmission being not performed on the first SL resource by the first device; and
determining a priority value of the HARQ feedback information,
wherein the priority value of the HARQ feedback information is a same as a largest priority value among at least one priority value related to the first SL resource.
2. The method of claim 1 , further comprising:
determining not to perform the first SL transmission on the first SL resource.
3. The method of claim 1 , wherein the HARQ feedback information generated by the first device, based on the first SL transmission being not performed on the first SL resource by the first device, is acknowledgement (ACK).
4. The method of claim 3 , wherein the first SL transmission includes physical sidelink control channel (PSCCH) transmission or physical sidelink shared channel (PSSCH) transmission.
5. The method of claim 4 , wherein the first SL resource is a resource allocated by a configured grant.
6. The method of claim 5 , wherein the first SL resource is allocated periodically by the configured grant, and
wherein, based on the first device not performing the first SL transmission on the first SL resource within a first period allocated by the configured grant, the ACK is generated by the first device.
7. The method of claim 1 , further comprising:
performing at least one of second SL transmission based on a second SL resource or PUCCH transmission including the HARQ feedback information based on the PUCCH resource, based on the priority value of the HARQ feedback information and a priority value of the second SL transmission,
wherein the PUCCH resource and the second SL resource overlap in a time domain.
8. The method of claim 7 , wherein, based on the priority value of the HARQ feedback information being smaller than the priority value of the second SL transmission, the PUCCH transmission including the HARQ feedback information is performed.
9. The method of claim 7 , wherein, based on the priority value of the HARQ feedback information being larger than the priority value of the second SL transmission, the second SL transmission is performed.
10. The method of claim 7 , wherein, based on (i) the priority value of the HARQ feedback information being smaller than the priority value of the second SL transmission and (ii) sum of power related to the PUCCH transmission and power related to the second SL transmission exceeding maximum transmit power of the first device, the power related to the second SL transmission is reduced such that the sum does not exceed the maximum transmit power.
11. The method of claim 7 , wherein, based on (i) the priority value of the HARQ feedback information being larger than the priority value of the second SL transmission and (ii) sum of power related to the PUCCH transmission and power related to the second SL transmission exceeding 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.
12. The method of claim 1 , further comprising:
performing physical random access channel (PRACH) transmission to the base station,
wherein a priority related to the PRACH transmission is higher than a priority related to physical sidelink feedback channel (PSFCH) transmission or a priority related to sidelink-synchronization signal block (S-SSB) transmission.
13. The method of claim 1 , wherein the at least one priority value related to the first SL resource is at least one possible priority value for a configured grant related to the first SL resource.
14. A first device configured to perform wireless communication, the first device comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
receiving, from a base station, information related to a physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information and information related to a first sidelink (SL) resource;
generating the HARQ feedback information based on first SL transmission being not performed on the first SL resource by the first device; and
determining a priority value of the HARQ feedback information,
wherein the priority value of the HARQ feedback information is a same as a largest priority value among at least one priority value related to the first SL resource.
15. The first device of claim 14 , wherein the operations further comprise determining not to perform the first SL transmission on the first SL resource.
16. The first device of claim 14 , wherein the HARQ feedback information generated by the first device, based on the first SL transmission being not performed on the first SL resource by the first device, is acknowledgement (ACK).
17. The first device of claim 16 , wherein the first SL transmission includes physical sidelink control channel (PSCCH) transmission or physical sidelink shared channel (PSSCH) transmission.
18. The first device of claim 17 , wherein the first SL resource is a resource allocated by a configured grant.
19. The first device of claim 18 , wherein the first SL resource is allocated periodically by the configured grant, and
wherein, based on the first device not performing the first SL transmission on the first SL resource within a first period allocated by the configured grant, the ACK is generated by the first device.
20. A processing device configured to control a first device, the processing device comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
receiving, from a base station, information related to a physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information and information related to a first sidelink (SL) resource;
generating the HARQ feedback information based on first SL transmission being not performed on the first SL resource by the first device; and
determining a priority value of the HARQ feedback information,
wherein the priority value of the HARQ feedback information is a same as a largest priority value among at least one priority value related to the first SL resource.