Patent ID: 8581689

Claim:
A method for synchronization in a vehicle network formed between wireless communication devices of vehicles traveling on a road, the method comprising: detecting a vehicle traveling on the road by a vehicle detection sensor installed at predetermined intervals; and when detecting the vehicle by the vehicle detection sensor, generating a beacon signal for synchronization by a synchronization device and transmitting the same to the wireless communication device of the vehicle, wherein the wireless communication device of the vehicle performs synchronization based on the beacon signal; wherein the beacon signal contains information indicating presence or absence of a forwarding message and an identification number of the corresponding message; if the information indicating the presence or absence of a forwarding message is contained in the beacon signal, the wireless communication device of the vehicle generating and transmitting a reception request message requesting transmission of the message; if the identification number of the message contained in of the beacon signal does not match an identification number of a previously received message, the wireless communication device of the vehicle transmits the reception request message.