Method and apparatus for transmitting and receiving a feedback signal in a wireless communication system

1. A method performed by a first terminal in a wireless communication system, the method comprising:

receiving, from a base station, a physical downlink shared channel (PDSCH);

transmitting, to a second terminal, a physical sidelink shared channel (PSSCH);

receiving, from the second terminal, a first hybrid automatic repeat request (HARQ)-ACK information associated with the PSSCH;

identifying priority between the first HARQ-ACK information associated with the PSSCH and a second HARQ-ACK information associated with the PDSCH; and

transmitting, to the base station, the first HARQ-ACK information or the second HARQ-ACK information based on the identified priority.

2. The method of claim 1 , wherein the priority between the first HARQ-ACK information and the second HARQ-ACK information is identified based on whether the PDSCH is associated with ultra-reliable and low latency communications (URLLC).

3. The method of claim 2 , wherein transmitting, to the base station, the first HARQ-ACK information or the second HARQ-ACK information based on the identified priority comprises:

transmitting, to the base station, the first HARQ-ACK information, if the PDSCH is not associated with the URLLC and a value associated with the priority of the first HARQ-ACK information is smaller than a threshold.

4. The method of claim 2 , wherein transmitting, to the base station, the first HARQ-ACK information or the second HARQ-ACK information based on the identified priority comprises:

transmitting, to the base station, the second HARQ-ACK information, if the PDSCH is not associated with the URLLC and a value associated with the priority of the first HARQ-ACK information is equal to or larger than a threshold.

5. The method of claim 1 , further comprising:

in case that the first terminal does not transmit sidelink data to the second terminal on resources indicated by a configured grant, generating an ACK for reporting to the base station.

6. The method of claim 1 , further comprising:

determining a number of physical sidelink feedback channel (PSFCH) transmissions; and

determining a transmission power for a PSFCH transmission among the PSFCH transmissions.

7. The method of claim 6 , further comprising:

in case that a total transmission power of scheduled PSFCH transmissions exceeds a maximum transmission power of PSFCH transmissions,

reducing each transmission power of the scheduled PSFCH transmissions until the total transmission power of the scheduled PSFCH transmissions does not exceed the maximum transmission power of the PSFCH transmissions.

8. The method of claim 6 ,

determining the number of PSFCH transmissions as N based on a priority of simultaneous PSFCH transmissions, wherein the N is equal to a maximum number of the PSFCH transmissions.

9. A first terminal in a wireless communication system, the first terminal comprising:

a transceiver; and

at least one processor configured to:

receive via the transceiver, from a base station, a physical downlink shared channel (PDSCH),

transmit via the transceiver, to a second terminal, a physical sidelink shared channel (PSSCH),

receive via the transceiver, from the second terminal, a first hybrid automatic repeat request (HARQ)-ACK information associated with the PSSCH,

identify priority between the first HARQ-ACK information associated with the PSSCH and a second HARQ-ACK information associated with the PDSCH, and

transmit via the transceiver, to the base station, the first HARQ-ACK information or the second HARQ-ACK information based on the identified priority.

10. The first terminal of claim 9 , wherein the priority between the first HARQ-ACK information and the second HARQ-ACK information is identified based on whether the PDSCH is associated with ultra-reliable and low latency communications (URLLC).

11. The first terminal of claim 10 , wherein the at least one processor is further configured to:

transmit via the transceiver, to the base station, the first HARQ-ACK information, if the PDSCH is not associated with the URLLC and a value associated with the priority of the first HARQ-ACK information is smaller than a threshold.

12. The first terminal of claim 10 , wherein the at least one processor is further configured to:

transmit via the transceiver, to the base station, the second HARQ-ACK information, if the PDSCH is not associated with the URLLC and a value associated with the priority of the first HARQ-ACK information is equal to or larger than a threshold.

13. The first terminal of claim 9 , wherein the at least one processor is further configured to:

in case that the first terminal does not transmit sidelink data to the second terminal on resources indicated by a configured grant, generate an ACK for reporting to the base station.

14. The first terminal of claim 9 , wherein the at least one processor is further configured to:

determine a number of physical sidelink feedback channel (PSFCH) transmissions; and

determine a transmission power for a PSFCH transmission among the PSFCH transmissions.

15. The first terminal of claim 14 , wherein the at least one processor is further configured to:

in case that a total transmission power of scheduled PSFCH transmissions exceeds a maximum transmission power of PSFCH transmissions,

reduce each transmission power of the scheduled PSFCH transmissions until the total transmission power of the scheduled PSFCH transmissions does not exceed the maximum transmission power of the PSFCH transmissions.

16. The first terminal of claim 14 , wherein the at least one processor is further configured to:

determine the number of PSFCH transmissions as N based on a priority of simultaneous PSFCH transmissions, wherein the N is equal to a maximum number of the PSFCH transmissions.