Method and device for allocating SL HARQ feedback report resource in NR V2X

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

receiving, from a base station through a physical downlink control channel (PDCCH), a downlink control information (DCI) for scheduling sidelink (SL) resources,

wherein the DCI includes information related to a time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource;

transmitting, to a second device, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), based on the DCI;

determining a plurality of PSFCH resources, based on indices of slots related to the plurality of PSSCHs, indices of subchannels related to the plurality of PSSCHs, and a source ID of the first device;

receiving, from the second device, a plurality of SL hybrid automatic repeat request (HARQ) feedbacks related to the plurality of PSSCHs on the plurality of PSFCH resources; and

transmitting, to the base station, one SL HARQ feedback on one PUCCH resource, based on the information related to the time and the information related to the PUCCH resource,

wherein the one PUCCH resource is allocated after a last PSFCH resource among the plurality of PSFCH resources.

2. The method of claim 1 , wherein the plurality of PSCCHs and the plurality of PSSCHs are transmitted within a time period.

3. The method of claim 2 , wherein the last PSFCH resource is a PSFCH resource related to a resource for a last PSSCH among resources for the plurality of PSSCHs within the time period.

4. The method of claim 3 , wherein the one PUCCH resource is in a slot after the time from the last PSFCH resource.

5. The method of claim 1 , wherein the SL resources are allocated periodically for the first device.

6. The method of claim 1 , wherein the DCI includes information for activation of the SL resources.

7. The method of claim 1 , wherein the information related to the time is information related to a number of slots between the one PUCCH resource and the last PSFCH resource among the plurality of PSFCH resources.

8. The method of claim 7 , further comprising:

determining a slot including the one PUCCH resource, based on the information related to the time; and

determining at least one of a frequency domain, a symbol domain, or a code domain of the one PUCCH resource in the slot, based on the information related to the PUCCH resource.

9. The method of claim 1 , wherein the information related to the time is information related to a number of symbols between the one PUCCH resource and the last PSFCH resource among the plurality of PSFCH resources.

10. The method of claim 9 , further comprising:

determining a symbol including the one PUCCH resource, based on the information related to the time; and

determining at least one of a frequency domain or a code domain of the one PUCCH resource in the symbol, based on the information related to the PUCCH resource.

11. The method of claim 1 , further comprising:

generating the one SL HARQ feedback based on the plurality of SL HARQ feedbacks.

12. The method of claim 11 , wherein the generated one SL HARQ feedback is ACK based on the plurality of SL HARQ feedbacks including NACK and ACK, and

wherein the generated one SL HARQ feedback is NACK based on the plurality of SL HARQ feedbacks including only NACK.

13. The method of claim 1 , further comprising:

receiving, from the base station, information related to a frequency domain of the PUCCH resource,

wherein the PUCCH resource is included in the frequency domain.

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:

receive, from a base station through a physical downlink control channel (PDCCH), a downlink control information (DCI) for scheduling sidelink (SL) resources,

wherein the DCI includes information related to a time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource;

transmit, to a second device, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), based on the DCI;

determining a plurality of PSFCH resources, based on indices of slots related to the plurality of PSSCHs, indices of subchannels related to the plurality of PSSCHs, and a source ID of the first device;

receive, from the second device, a plurality of SL hybrid automatic repeat request (HARQ) feedbacks related to the plurality of PSSCHs on the plurality of PSFCH resources; and

transmit, to the base station, one SL HARQ feedback on one PUCCH resource, based on the information related to the time and the information related to the PUCCH resource,

wherein the one PUCCH resource is allocated after a last PSFCH resource among the plurality of PSFCH resources.

15. The first device of claim 14 , wherein the plurality of PSCCHs and the plurality of PSSCHs are transmitted within a time period.

16. The first device of claim 15 , wherein the last PSFCH resource is a PSFCH resource related to a resource for a last PSSCH among resources for the plurality of PSSCHs within the time period.

17. The first device of claim 16 , wherein the one PUCCH resource is in a slot after the time from the last PSFCH resource.

18. The first device of claim 14 , wherein the SL resources are allocated periodically for the first device.

19. The first device of claim 14 , wherein the DCI includes information for activation of the SL resources.

20. An apparatus configured to control a first user equipment (UE), 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:

receive, from a base station through a physical downlink control channel (PDCCH), a downlink control information (DCI) for scheduling sidelink (SL) resources,

wherein the DCI includes information related to a time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource;

transmit, to a second UE, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs), based on the DCI;

determining a plurality of PSFCH resources, based on indices of slots related to the plurality of PSSCHs, indices of subchannels related to the plurality of PSSCHs, and a source ID of the first UE;

receive, from the second UE, a plurality of SL hybrid automatic repeat request (HARQ) feedbacks related to the plurality of PSSCHs on the plurality of PSFCH resources; and

transmit, to the base station, one SL HARQ feedback on one PUCCH resource, based on the information related to the time and the information related to the PUCCH resource,

wherein the one PUCCH resource is allocated after a last PSFCH resource among the plurality of PSFCH resources.