Method for transmitting security information based on vehicular network

A method for transmitting a safety message based on vehicular network, the method being applied to vehicle-vehicle communication comprising a transmitting side and a receiving side, the method for transmitting the safety message successively comprises:

• S1, transmitting a wireless access service announcement information in a conventional vehicle environment to the receiving side, the wireless access service announcement information carrying a temporary safety message transmission channel identifier;
• appointing a temporary safety message transmission channel for a service channel interval;
• S2, transmitting the safety message, and when a control channel interval is analyzed to have remaining transmissible bytes, dividing the safety message into a first segment to which a remaining packet mark is appended and a second segment to which a remaining packet mark is not appended, transmitting the first segment to the receiving side during the control channel interval, and transmitting the second segment to the receiving side during service channel interval;
• Wherein, the step S2 further comprises:
• S21, analyzing how many remaining bytes capable of being transmitted in the service channel interval if the transmitting side of the safety message does not have enough time to completely transmit the whole safety message at the end of the service channel interval;
• S22, dividing the safety message into two segments, namely the first segment and the second segment, appending the remaining packet mark to the first segment, and transmitting the first segment carrying the remaining packet mark in the service channel interval;
• and S23, switching to the temporary safety message transmission channel in the service channel interval in a guard interval, without resource competition, the transmitting side directly transmitting remaining safety message, namely the second segment;
• meanwhile, all of the receiving side suspending channel competition, and receiving the segment of the remaining safety message.