Method for ACK/NACK transmission and reception in wireless communication system and apparatus therefor

A user equipment (UE) for transmitting or receiving a Physical Sidelink Feedback Channel (PSFCH) a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• transmitting, via the at least one transceiver, first data a first Physical Sidelink Shared Channel (PSSCH);
• receiving, via the at least one transceiver, a second PSSCH;
• receiving, via the at least one transceiver, a first PSFCH for the first PSSCH based on a first priority value for the first PSSCH being smaller than a second priority value for the second PSSCH;
• and
• transmitting, via the at least one transceiver, a second PSFCH for the second PSSCH based on the second priority value being smaller than the first priority value,
• wherein a first time resource for the first PSFCH is overlapped with a second time resource for the second PSFCH.

An apparatus for transmitting or receiving a Physical Sidelink Feedback Channel (PSFCH) in a wireless communication system, the apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• transmitting a first Physical Sidelink Shared Channel (PSSCH);
• receiving a second PSSCH;
• receiving a first PSFCH for the first PSSCH based on a first priority value for the first PSSCH being smaller than a second priority value for the second PSSCH;
• and
• transmitting a second PSFCH for the second PSSCH based on the second priority value being smaller than the first priority value,
• wherein a first time resource for the first PSFCH is overlapped with a second time resource for the second PSFCH.

A non-transitory computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations, the operations comprising:

• transmitting a first Physical Sidelink Shared Channel (PSSCH);
• receiving a second PSSCH;
• receiving a first PSFCH for the first PSSCH based on a first priority value for the first PSSCH being smaller than a second priority value of for the second PSSCH;
• and
• transmitting a second PSFCH for the second PSSCH based on the second priority value being smaller than the first priority value,
• wherein a first time resource for the first PSFCH is overlapped with a second time resource for the second PSFCH.