Transmission and receipt processing method and device for time-frequency synchronization between v2x terminals

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• identify configuration information for sidelink communication including information indicating a synchronization priority;
• identify whether the information is set to a global navigation satellite system (GNSS) or a base station;
• and
• in case that the information is set to the GNSS, select a synchronization reference from a plurality of the synchronization signals detected by the terminal based on a priority order,
• wherein the priority order includes:
• at least one first terminal transmitting at least one first synchronization signal has a first priority;
• the base station has a second priority;
• at least one second terminal transmitting at least one second synchronization signal has a third priority;
• and
• other terminals have a fourth priority, and
• wherein the at least one first terminal has selected the GNSS as the synchronization reference and the at least one second terminal has selected the base station as the synchronization reference.