【摘要】 针对车载自组网传输车辆碰撞警告信息所产生的网络洪泛和盲目传输问题,提出并实现了一种基于相邻车辆间距的车载自组网分簇算法,利用该算法对车辆分簇,确定了安全相关车辆和碰撞警告信息的传输范围,并在此基础上构造骨干网络以避免网络洪泛。此外,设计了相关MAC层协议来保证该类信息优先访问无线信道。仿真结果表明,相对于传统方法的20 s传输时延,方法在0.1 s内就将碰撞警告信息传递到所有车辆,显著降低了该类信息的时延,减少了车辆碰撞次数。更多还原

【Abstract】 Aiming at the problem of vehicle collision-warning-messages flooding and unlimited propagation in vehicular ad hoc networks,a clustering algorithm was proposed and implemented based on the distance between adjacent vehicles.Using the algorithm,vehicles were clustered to determine the vehicles which are mutually dangerous and the propagation distance of the messages.Then,based on clustering,a virtual backbone network was constructed to avoid flooding.In addition,the MAC layer protocol was designed to ensure that the messages had priority access to the radio channel.The results show that,compared with the 20 seconds delay of the traditional method,the proposed method transmits the messages to all vehicles within 0.1 seconds,reduces the delay of the messages and mitigates collision risks of the vehicles significantly.更多还原