车辆自组织网络中的应用可以分为安全性和非安全性两种.安全性应用主要处理紧急路况等问题，对通信的时延和可靠性有严格要求.为此，提出一种基于多信道协同合作的需求感知介质访问控制协议，该协议由路边单元广播安全询问数据包以提前预约控制时隙，实现车辆节点无碰撞地发送紧急信息的目的，并根据安全数据的需求量动态划分控制时隙和服务时隙，促使每一个节点都能通过路边单元动态调度的方式按序广播安全信息，降低了分组碰撞的概率.仿真结果表明，所提出的介质访问控协议与传统的IEEE 802.11p协议相比，能够提高网络吞吐量，降低端到端的传输时延.
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.
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