Method for performing D2D operation by terminal in wireless communication system and terminal using same method

A user equipment (UE), comprising:

• a transceiver configured to transmit and receive a radio signal;
• and
• a processor operating in association with the transceiver,
• wherein the processor is configured to:
• determine priorities of a first Device-to-Device (D2D) operation and a second D2D operation when the first D2D operation is performed on a first carrier and the second D2D operation is performed on a second carrier simultaneously;
• and
• perform the first D2D operation and the second D2D operation simultaneously in a same time domain based on the priorities,
• wherein a first coverage status of the UE on the first carrier is different from a second coverage status of the UE on the second carrier, and
• wherein, when the first coverage status is in-coverage, the second coverage status is out-of-coverage, and
• when the first coverage status is the out-of-coverage, the second coverage status is the in-coverage.