Method and apparatus for transmitting HARQ feedback to base station in NR V2X

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 and information related to M sidelink (SL) slots;

performing N physical sidelink shared channel (PSSCH) transmissions, based on N SL slots among the M SL slots;

determining one physical sidelink feedback channel (PSFCH) slot related to the N PSSCH transmissions;

receiving information on K SL hybrid automatic repeat request (HARQ) feedbacks on the one PSFCH slot, in response to the N PSSCH transmissions; and

transmitting, to the base station, HARQ feedback information based on the PUCCH resource,

wherein information on L HARQ feedbacks related to the one PSFCH slot is included in the HARQ feedback information,

wherein the L is a number of SL slots related to the one PSFCH slot, and

wherein the M, the N, the K and the L are positive integers, and the L is greater than or equal to the M, and the M is greater than or equal to the N, and the N is greater than or equal to the K.

2. The method of claim 1 , wherein the L which is the number of SL slots related to the one PSFCH slot is equal to a period of a PSFCH resource.

3. The method of claim 1 , wherein information on L-N HARQ feedbacks related to L-N SL slots in which the N PSSCH transmissions are not performed among L SL slots related to the one PSFCH slot is generated as ACK, and

wherein the L is greater than the N.

4. The method of claim 1 , wherein, based on the N being greater than or equal to a threshold, the HARQ feedback information is transmitted to the base station based on the PUCCH resource, and

wherein, based on the N being less than the threshold, the HARQ feedback information is not transmitted to the base station based on the PUCCH resource.

5. The method of claim 1 , wherein L-N NACKs are received based on L-N PSFCH resources related to L-N SL slots in which the N PSSCH transmissions are not performed among L SL slots related to the one PSFCH slot,

wherein the L-N PSFCH resources are included in the one PSFCH slot,

wherein the K is equal to the M, and

wherein the L is greater than the N.

6. The method of claim 5 , wherein information on L-N HARQ feedbacks related to the L-N NACKs received based on the L-N PSFCH resources is generated as ACK.

7. The method of claim 1 , wherein SL HARQ feedback information is not received based on N-K PSFCH resources on the one PSFCH slot, in response to the N PSSCH transmissions,

wherein information on N-K HARQ feedbacks related to the N-K PSFCH resources is generated as NACK, and

wherein the K is less than the N.

8. The method of claim 1 , wherein SL HARQ feedback information is not received based on N-K PSFCH resources on the one PSFCH slot, in response to the N PSSCH transmissions,

wherein information on N-K HARQ feedbacks related to the N-K PSFCH resources is generated as ACK, and

wherein the K is less than the N.

9. The method of claim 1 , wherein the PUCCH resource and the M SL slots are allocated to the first device by a configured grant (CG).

10. The method of claim 9 , wherein, based on the N being less than a threshold, the information on the L HARQ feedbacks is not transmitted to the base station based on the PUCCH resource.

11. The method of claim 1 , wherein the PUCCH resource and the M SL slots are allocated to the first device by a dynamic grant (DG).

12. The method of claim 11 , wherein, based on the N being less than a threshold, the information on the L HARQ feedbacks is transmitted to the base station based on the PUCCH resource, and

wherein, based on the L being greater than the N, information on L-N HARQ feedbacks related to L-N SL slots in which the N PSSCH transmissions are not performed among L SL slots is generated as ACK.

13. The method of claim 1 , wherein the SL slot is a slot including a specific number or more of UL symbols.

14. 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 related to a physical uplink control channel (PUCCH) resource and information related to M sidelink (SL) slots;

control the one or more transceivers to perform N physical sidelink shared channel (PSSCH) transmissions, based on N SL slots among the M SL slots;

determine one physical sidelink feedback channel (PSFCH) slot related to the N PSSCH transmissions;

control the one or more transceivers to receive information on K SL hybrid automatic repeat request (HARQ) feedbacks on the one PSFCH slot, in response to the N PSSCH transmissions; and

control the one or more transceivers to transmit, to the base station, HARQ feedback information based on the PUCCH resource,

wherein information on L HARQ feedbacks related to the one PSFCH slot is included in the HARQ feedback information,

wherein the L is a number of SL slots related to the one PSFCH slot, and

wherein the M, the N, the K and the L are positive integers, and the L is greater than or equal to the M, and the M is greater than or equal to the N, and the N is greater than or equal to the K.

15. The first device of claim 14 , wherein the L which is the number of SL slots related to the one PSFCH slot is equal to a period of a PSFCH resource.

16. The first device of claim 14 , wherein information on L-N HARQ feedbacks related to L-N SL slots in which the N PSSCH transmissions are not performed among L SL slots related to the one PSFCH slot is generated as ACK, and

wherein the L is greater than the N.

17. The first device of claim 14 , wherein, based on the N being greater than or equal to a threshold, the HARQ feedback information is transmitted to the base station based on the PUCCH resource, and

wherein, based on the N being less than the threshold, the HARQ feedback information is not transmitted to the base station based on the PUCCH resource.

18. The first device of claim 14 , wherein L-N NACKs are received based on L-N PSFCH resources related to L-N SL slots in which the N PSSCH transmissions are not performed among L SL slots related to the one PSFCH slot,

wherein the L-N PSFCH resources are included in the one PSFCH slot,

wherein the K is equal to the M, and

wherein the L is greater than the N.

19. The first device of claim 18 , wherein information on L-N HARQ feedbacks related to the L-N NACKs received based on the L-N PSFCH resources is generated as ACK.

20. A processing device adapted to control a first device performing wireless communication, the processing device 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 related to a physical uplink control channel (PUCCH) resource and information related to M sidelink (SL) slots;

perform N physical sidelink shared channel (PSSCH) transmissions, based on N SL slots among the M SL slots;

determine one physical sidelink feedback channel (PSFCH) slot related to the N PSSCH transmissions;

receive information on K SL hybrid automatic repeat request (HARQ) feedbacks on the one PSFCH slot, in response to the N PSSCH transmissions; and

transmit, to the base station, HARQ feedback information based on the PUCCH resource,

wherein information on L HARQ feedbacks related to the one PSFCH slot is included in the HARQ feedback information,

wherein the L is a number of SL slots related to the one PSFCH slot, and

wherein the M, the N, the K and the L are positive integers, and the L is greater than or equal to the M, and the M is greater than or equal to the N, and the N is greater than or equal to the K.