Sidelink harq feedback of nr v2x

A first apparatus transmitting sidelink hybrid automatic repeat request (SL HARQ) feedback information, the first apparatus including:

• at least one memory storing instructions;
• at least one transceiver;
• and
• at least one processor connecting the at least one memory and the at least one transceiver,
• wherein the at least one processor is configured to:
• control the at least one transceiver to receive a first physical sidelink shared channel (PSSCH) from a second apparatus,
• determine a resource related to a physical sidelink feedback channel (PSFCH) based on a resource related to the first PSSCH,
• determine an SL HARQ feedback option based on link quality between the first apparatus and the second apparatus, and
• control the at least one transceiver to transmit SL HARQ feedback information for the first PSSCH to the second apparatus through a resource related to the PSFCH based on whether decoding of a transport block received through the first PSSCH succeeds and the SL HARQ feedback option,
• wherein the SL HARQ feedback option is determined to one of a first SL HARQ feedback option or a second SL HARQ feedback option.

An apparatus controlling a first terminal, the apparatus including:

• at least one processor;
• and
• at least one computer memory operably connected by the at least one processor and storing instructions,
• wherein, by the at least one processor executing the instructions, the first terminal is configured to:
• receive a first physical sidelink shared channel (PSSCH) from a second apparatus,
• determine a resource related to a physical sidelink feedback channel (PSFCH) based on a resource related to the first PSSCH,
• determine an SL HARQ feedback option based on link quality between the first apparatus and the second apparatus, and
• transmit SL HARQ feedback information for the first PSSCH to the second apparatus through a resource related to the PSFCH based on whether decoding of a transport block received through the first PSSCH succeeds and the SL HARQ feedback option,
• wherein the SL HARQ feedback option is determined to one of a first SL HARQ feedback option or a second SL HARQ feedback option.