Method and device for transmitting and receiving synchronization signal of device-to-device communication terminal in wireless communication system

A user equipment (UE) for transmitting a sidelink synchronization signal (SLSS) for Vehicle-to-Everything (V2X) sidelink communication in a wireless communication system, the UE comprising:

• a transmitter and a receiver;
• and
• a processor,
• wherein the processor is configured to select a SLSS ID from a first ID set except a second ID set and transmit the SLSS generated by using the selected SLSS ID,
• wherein the UE has no synchronization reference UE,
• wherein the second ID set includes a SLSS ID of 169 which is configured to be used by the UE in a first state,
• wherein the first state is that the UE has a first synchronization reference UE and receives a first SLSS on a first resource for out of coverage UE,
• wherein the first SLSS was generated by using SLSS ID 0 and was transmitted from the first synchronization reference UE.