Method for V2X communication performed by means of terminal in wireless communication system and terminal using same

A user equipment (UE) comprising:

• a Radio Frequency (RF) unit including a transceiver configured to transmit and receive a radio signal;
• and
• a processor configured to operate in conjunction with the RF unit, wherein the processor is further configured:
• determine whether or not a first transmission time of first feedback information on sidelink Semi Persistent Scheduling (SPS) information and a second transmission time of second feedback information on a Wide Area Network (WAN) Physical Downlink Shared Channel (PDSCH) overlap;
• and
• transmit the first feedback information and the second feedback information based on the determination,
• wherein, based on the first transmission time and the second transmission time overlapping, the first feedback information and the second feedback information are transmitted via multiplexing and based on a priority order, and
• wherein, based on the first feedback information and the second feedback information being transmitted via the multiplexing, the first feedback information and the second feedback information are multiplexed based on an acknowledgement (ACK)/negative acknowledgement KNACK) channel selection table.