Abstract: The applications of vehicle self-organizing network are generally divided into the two types of security and non-security. Security applications mainly deal with issues such as emergency road conditions. Therefore, the delay and reliability of communication are strictly required for security applications. In this paper, we proposed a kind of demandaware medium access control protocol based on multichannel cooperative cooperation in vehicular ad hoc networks. First, the proposed protocol broadcasts the security query packets through roadside units, which send the emergency information of vehicle nodes in the control slots reserved in advance. The division of time slot is dynamically provisioned according to the demand of security data of each node. Thus, all nodes will be coordinated by RSU in order to reduce the collision probability and the delivery delay of data packets. Simulation results show that the media access control protocol proposed in this paper can improve the network throughput and reduce the end-to-end transmission delay, compared with the traditional IEEE 802.11p protocol.

Key words: coordinated multichannel, MAC protocol, vehicular ad-hoc network (VANET), demand-aware