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为解决智能车载网络中MAC层由于链路不稳定、信道冲突、广播风暴等问题导致的数据丢包严重问题,提出采用基于路段分区的区域优化泛洪广播协议,充分结合道路交通以及车辆运行状态情况,设计能动态自适应调整相关参数以优化性能的M AC协议,提高信息广播的可靠性.设计的路段域红灯等停路口车辆簇头机制,通过将网络分割成相对独立、自治的子簇,将广播信息的传输限制在同路段的簇内和该路段内有限的节点之间进行.簇内通信引入RTS-CTS握手方式以及簇内竞争窗口调节机制,设计了综合考虑城市网络环境以及车辆自身特性的自适应MAC竞争窗机制.仿真实验表明,该方案针对不同的道路交通流量都能获得较好的网络传输性能,非常适合于大规模、动态变化的智能城市车载网络.
In order to solve the serious data packet loss caused by the MAC layer in intelligent vehicle network due to link instability, channel collision and broadcast storm, this paper proposes a district-based optimized flooding broadcast protocol based on road section zoning, fully combines road traffic and vehicle running status Situation and design can improve the reliability of MAB by adaptively adjusting relevant parameters to optimize the performance of the MAC protocol.Designed road segment cluster head mechanism of red light and other vehicles at the road stop by dividing the network into relatively independent and autonomous sub- Cluster, which restricts the transmission of broadcast information between the clusters in the same link and the limited nodes in the link.Cluster-based communication introduces the RTS-CTS handshake method and the intra-cluster contention window adjustment mechanism, and designs a comprehensive consideration of urban network environment and The self-adaptive MAC contention window mechanism of vehicles is simulated.The simulation results show that this scheme can get better network transmission performance for different road traffic flow and is very suitable for large-scale and dynamic urban smart car network.