高速公路汽车追尾预警网络MAC算法研究

Research on MAC algorithm of network about Early Warning System of Automobile Rear-end in the Expressway

从高速公路汽车追尾碰撞预警的需要出发,根据高速公路汽车运行速度快、拓扑结构多变的特点,为高速公路汽车追尾预警Ad Hoc网络选择单跳广播方式,基于TDMA机制提出了一种以栅格法和向量指针为改进形式的MAC协议算法。仿真结果显示,该方法协调各区间信息发布权同步移交,有序规定汽车接入信道的时机,实现了数据报文无冲突广播,满足汽车追尾预警实时业务要求。

From the freeway rear-end collision warning needs,according to the freeway characteristics of vehicle fleetness and topology multifarious variety,the single hop broadcast is selected for Ad Hoc network of car rear-end collision early warning in expressway,and the MAC protocol algorithm based on TDMA is improved by general use of a grid method and vector pointers.Simulation results show that the method coordinated the right synchronous transfer of information release in all zones,ordered the time in which the vehicle accessed a correspondence channel.The data packets were broadcast without any conflict to meet the operational requirements of rear-end early warning.