Method for performing V2X communication in wireless communication system and apparatus for same

A user equipment (UE) for performing vehicle-to-everything (V2X) communication in a wireless communication system, the UE comprising:

• a 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 by the at least one processor, perform operations comprising:
• receiving, via the transceiver, from an upper layer of the UE, a transmission request of a V2X message of a V2X service identified by a V2X service identifier using V2X communication over PC5;
• requesting and selecting radio resources for V2X communication over PC5 based on whether the UE is served by an evolved universal terrestrial radio access network (E-UTRAN) for the V2X communication;
• and
• transferring, via the transceiver, to a lower layer of the UE, the V2X message for performing transmission of the V2X message over PC5,
• wherein the transmission request includes the V2X message and the V2X service identifier of the V2X service for the V2X message, and
• wherein if a transmission parameter is associated with the V2X service identifier, the transmission parameter is transferred to the lower layer with the V2X message.