中文摘要：

针对车辆网络的警告消息散布问题进行研究,提出一种有效的警告消息散布协议WMD。在WMD中,时间被分成一个个带时间槽的时间帧,每个时槽被分成两个子时槽,第一个时槽用来实时获取邻居位置,第二个时槽用来散布警告消息。为了实时获取邻居位置,WMD采取自适应的发送策略。通过理论分析,对每个时间帧的发送次数以及每个时间帧的长度进行优化。基于真实车辆行驶数据进行仿真实验。实验结果表明,相比其他方法,WMD实现了较快的散布速率和较高的接收率。

英文摘要：

This paper investigated the problem of warning message dissemination in vehicular networks, and proposed a proto- col called WMD for efficient warning message dissemination. In WMD, time was divided into frames with several time slots in length. Each time slot was further divided into two subslots. It used the first subslot for acquiring neighbor position in real time, and the second subslot for disseminating warning message. In order to acquire neighbor position in real time, WMD adopted an adaptive message transmission strategy. Based on an analytical framework, this paper theoretically determined the optimal configurations for number of probe messages and frame length. Based on real traces of vehicles, this paper conducted real trace-driven simulations. Performance results demonstrate that WMD can achieve faster dissemination speed and higher re- ceiving ratio compared with some other alternative protocols.