Safety message transmitting method for vehicle infrastructure integration

Summary form only given. Recent years, as one of the application scenario of MANETs, the vehicular ad hoc networks (VANETs) attracted great interest in the field of intelligent transportation systems (ITS). There are some properties in VANET which make it different from MANET, for example high speeds vehicles result in frequent and fast changes in the network topologies, network topologies and the node movements are constrained by physical factors as vehicles can only move along road ways. With the help of VANETs, many kinds of safety and traffic efficiency related applications can be realized, such as cooperative collision avoiding: the high speed of wireless communication let drivers have enough time to stop the vehicle before crashes happening; dynamic traffic assignment: the traffic conditions can be transmitted to the drivers directly with wireless data communication. These applications, particularly safety applications, require a high availability of the communication system and low delivery latency for data packets.