Method and device for determining priority of HARQ feedback in NR V2X

1. A method for performing wireless communication by a first device, the method comprising:

receiving, from a base station, information regarding a physical uplink control channel (PUCCH) and information regarding a configured grant for sidelink (SL);

generating hybrid automatic repeat request (HARQ) feedback information including ACK information, based on the first device not transmitting a physical sidelink control channel (PSCCH) with sidelink control information (SCI) in any of resources provided by the configured grant in a single period; and

determining a priority value of the ACK information,

wherein the priority value of the ACK information, generated based on the first device not transmitting the PSCCH with the SCI in any of resources provided by the configured grant in the single period, is same as a largest priority value among at least one possible priority value for the configured grant,

wherein, based on the priority value of the ACK information being larger than a priority value of a SL communication, the SL communication is performed, and

wherein based on a SL priority threshold for uplink (UL) related with an ultra-reliable and low- latency communications (URLLC) being configured for the first device, a priority index value of a PUCCH is set to 1 for the first device, and based on the SL priority threshold for the UL related with the URLLC being smaller than the priority value of the SL communication, the PUCCH of which the priority index value is set to 1 is transmitted.

2. The method of claim 1 , further comprising:

receiving, from the base station, the at least one possible priority value for the configured grant.

3. The method of claim 1 , wherein the resources provided by the configured grant includes periodic resources allocated to the first device based on at least one of a downlink control information (DCI) or radio resource control (RRC) signaling.

4. The method of claim 1 , wherein a retransmission resource, related with the resources in the single period, is not allocated to the first device by the base station based on the ACK information.

5. The method of claim 1 , further comprising:

determining, based on the priority value of the ACK information, whether or not to transmit the ACK information to the base station based on the PUCCH.

6. The method of claim 5 , wherein, based on the priority value of the ACK information being smaller than the priority value of the SL communication, the ACK information is transmitted to the base station based on the PUCCH.

7. The method of claim 5 , wherein, based on the priority value of the ACK information being smaller than the priority value of the SL communication, transmit power for the SL communication is reduced.

8. The method of claim 5 , wherein, based on the priority value of the ACK information being larger than the priority value of the SL communication, transmit power for the PUCCH is reduced.

9. The method of claim 1 , wherein, based on the SL priority threshold for the UL related with the URLLC not being configured for the first device, the priority index value of the PUCCH is set to 0 for the first device, and the PUCCH of which the priority index value set to 0 is related with enhanced mobile broadband (eMBB).

10. The method of claim 1 , wherein, based on the SL priority threshold for the UL related with the URLLC being configured for the first device, the priority index value of the PUCCH is set to 1 for the first device, and based on the priority value of the SL communication being smaller than the SL priority threshold for the UL related with the URLLC, the PUCCH of which the priority index value is set to 1 is not transmitted.

11. The method of claim 1 , wherein transmission of the HARQ feedback information is performed within a time after k slot with reference to a physical sidelink feedback channel (PSFCH) reception occasion.

12. A first device adapted 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:

control the one or more transceivers to receive, from a base station, information regarding a physical uplink control channel (PUCCH) for reporting hybrid automatic repeat request (HARQ) feedback information and information regarding a configured grant for sidelink (SL);

generate ACK information, based on the first device not transmitting a physical sidelink control channel (PSCCH) with sidelink control information (SCI) in any of resources provided by the configured grant in a single period; and

determine a priority value of the ACK information,

wherein the priority value of the ACK information, generated based on the first device not transmitting the PSCCH with the SCI in any of resources provided by the configured grant in the single period, is same as a largest priority value among at least one possible priority value for the configured grant,

wherein, based on the priority value of the ACK information being larger than a priority value of a SL communication, the SL communication is performed, and

wherein based on a SL priority threshold for uplink (UL) related with an ultra-reliable and low- latency communications (URLLC) being configured for the first device, a priority index value of a PUCCH is set to 1 for the first device, and based on the SL priority threshold for the UL related with the URLLC being smaller than the priority value of the SL communication, the PUCCH of which the priority index value is set to 1 is transmitted.

13. The first device of claim 12 , wherein the one or more processors further execute the instructions to: receive, from the base station, the at least one possible priority value for the configured grant.

14. The first device of claim 12 , wherein the resources provided by the configured grant includes periodic resources allocated to the first device based on at least one of a downlink control information (DCI) or radio resource control (RRC) signaling.

15. The first device of claim 12 , wherein a retransmission resource, related with the resources in the single period, is not allocated to the first device by the base station based on the ACK information.

16. The first device of claim 12 , wherein the one or more processors further execute the instructions to: determine, based on the priority value of the ACK information, whether or not to transmit the ACK information to the base station based on the PUCCH.

17. The first device of claim 12 , wherein transmission of the HARQ feedback information is performed within a time after k slot with reference to a physical sidelink feedback channel (PSFCH) reception occasion.

18. A first device performing wireless communication and 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:

receive, from a base station, information regarding a physical uplink control channel (PUCCH) for reporting hybrid automatic repeat request (HARQ) feedback information and information regarding a configured grant for sidelink (SL);

generate ACK information, based on the first device not transmitting a physical sidelink control channel (PSCCH) with sidelink control information (SCI) in any of resources provided by the configured grant in a single period; and

determine a priority value of the ACK information,

wherein the priority value of the ACK information, generated based on the first device not transmitting the PSCCH with the SCI in any of resources provided by the configured grant in the single period, is same as a largest priority value among at least one possible priority value for the configured grant,

wherein, based on the priority value of the ACK information being larger than a priority value of a SL communication, the SL communication is performed, and

wherein based on a SL priority threshold for uplink (UL) related with an ultra-reliable and low- latency communications (URLLC) being configured for the first device, a priority index value of a PUCCH is set to 1 for the first device, and based on the SL priority threshold for the UL related with the URLLC being smaller than the priority value of the SL communication, the PUCCH of which the priority index value is set to 1 is transmitted.

19. The first device of claim 18 , wherein transmission of the HARQ feedback information is performed within a time after k slot with reference to a physical sidelink feedback channel (PSFCH) reception occasion.