Method and device for transmitting or receiving physical sidelink feedback channel in wireless communication system

1. A method of a first User Equipment (UE) for transmitting a Physical Sidelink Feedback Channel (PSFCH) in a wireless communication system, the method comprising:

receiving, from a second UE, a first Physical Sidelink Control Channel (PSCCH), wherein a first Sidelink Control Information (SCI) related to the first PSCCH is for scheduling of a first Physical Sidelink Shared Channel (PSSCH);

receiving, from the second UE, the first PSSCH;

receiving, from the second UE, a second PSCCH, wherein a second SCI related to the second PSCCH is for scheduling of a second PSSCH;

transmitting, to the second UE, a first PSFCH providing HARQ-ACK information related to the reception of the first PSSCH; and

transmitting, to the second UE, a second PSFCH providing conflict information related to a reception of the second PSSCH;

wherein the second PSFCH is transmitted in a slot that is at least T 3 slots before a slot of a reserved resource based on the second SCI,

wherein the T 3 is equal to T proc,1 SL determined based on a SubCarrier Spacing (SCS) configuration of a SideLink BandWidth Part (SL BWP), and

wherein the first PSFCH and the second PSFCH are transmitted in different Physical Resource Blocks (PRBs).

2. The method of claim 1 , further comprising: receiving, from a base station, configuration information related to at least one of the first PSFCH or the second PSFCH, via RRC signaling.

3. The method of claim 1 , wherein the slot is based on a slot that is at least a number of slots after a slot on which the second SCI is received, and

wherein the number of slots is determined based on a value of an sl-MinTimeGapPSFCH parameter related to a minimum time gap between the second PSSCH and the second PSFCH.

4. The method of claim 3 , wherein the conflict information is based on the second SCI not received later than the number of slots before the slot in which the second PSFCH is transmitted.

5. The method of claim 1 , wherein a priority related to a reception of the second PSFCH by the second UE is determined based on a priority related to the reserved resource based on the second SCI.

6. The method of claim 1 , wherein the second PSFCH is transmitted based on inability to receive the second PSSCH in the reserved resource based on the second SCI due to half-duplex operation of the first UE, and

the half-duplex operation of the first UE includes a transmission operation or a reception operation of the first UE.

7. The method of claim 1 , wherein the second PSFCH is transmitted based on overlapping of the reserved resource based on the second SCI with a reserved resource based on SCI of a third UE, and

the third UE is different from the second UE.

8. The method of claim 1 ,

wherein the first PSFCH is transmitted in at least one first PRB of the slot and the second PSFCH is transmitted in at least one second PRB of the slot.

9. The method of claim 1 , wherein a slot in which the first PSFCH is transmitted is different from the slot in which the second PSFCH is transmitted.

10. A first user equipment (UE) transmitting a Physical Sidelink Feedback Channel (PSFCH) in a wireless communication system, the first UE comprising:

one or more transceivers;

one or more processors controlling the one or more transceivers; and

one or more memories operably connected to the one or more processors,

wherein the one or more memories store instructions for performing operations based on being executed by the one or more processors,

wherein the operations include:

receiving, from a second UE, a first Physical Sidelink Control Channel (PSCCH), wherein a first Sidelink Control Information (SCI) related to the first PSCCH is for scheduling of a first Physical Sidelink Shared Channel (PSSCH);

receiving, from the second UE, the first PSSCH;

receiving, from the second UE, a second PSCCH, wherein a second SCI related to the second PSCCH is for scheduling of a second PSSCH;

transmitting, to the second UE, a first PSFCH providing HARQ-ACK information related to the reception of the first PSSCH; and

transmitting, to the second UE, a second PSFCH providing conflict information related to a reception of the second PSSCH;

wherein the second PSFCH is transmitted in a slot that is at least T slots before a slot of a reserved resource based on the second SCI,

wherein the T 3 is equal to T proc,1 SL determined based on a SubCarrier Spacing (SCS) configuration of a SideLink BandWidth Part (SL BWP),

wherein the first PSFCH and the second PSFCH are transmitted in different Physical Resource Blocks (PRBs).

11. A method of a second User Equipment (UE) for receiving a Physical Sidelink Feedback Channel (PSFCH) in a wireless communication system, the method comprising:

transmitting, to a first UE, a first Physical Sidelink Control Channel (PSCCH), wherein a first Sidelink Control Information (SCI) related to the first PSCCH is for scheduling of a first Physical Sidelink Shared Channel (PSSCH);

transmitting, to the first UE, the first PSSCH;

transmitting, to the first UE, a second PSCCH, wherein a second SCI related to the second PSCCH is for scheduling of a second PSSCH;

receiving, from the first UE, a first PSFCH providing HARQ-ACK information related to a reception of the first PSSCH by the first UE; and

receiving, from the first UE, a second PSFCH providing conflict information related to a reception of the second PSSCH by the first UE;

wherein the second PSFCH is received in a slot that is at least T 3 slots before a slot of a reserved resource based on the second SCI,

wherein the T 3 is equal to T proc,1 SL determined based on a SubCarrier Spacing (SCS) configuration of a SideLink BandWidth Part (SL BWP),

wherein the first PSFCH and the second PSFCH are received in different Physical Resource Blocks (PRBs).