基于速率自适应的VANET预警信息广播.pdfVIP

第36 卷 第21 期 计 算 机 工 程 2010 年11 月 Vol.36 No.21 Computer Engineering November 2010 ·网络与通信· 文章编号：1000—3428(2010)21—0100—03 文献标识码：A 中图分类号：TP393 基于速率自适应的VANET 预警信息广播 刘彦龙，吕 品，陈颖文，匡罗贝，徐 明 ( 国防科学技术大学计算机学院，长沙 410073) 摘 要：为满足车辆自组织网络(VANET)中预警信息广播快速、可靠的要求，结合多接口多信道技术，提出一种基于速率自适应的VANET 预警信息广播机制 BRAVE 。仿真实验结果表明，该机制能够缩短预警信息传播时间，减少重播冗余，确保信息传播的可靠性。与单用传 输速率和传播范围为依据选择转播节点进行传播的机制相比，其传输延迟分别降低了3.9%和66.0%。 关键词：车辆自组织网络；速率自适应；预警信息；广播机制 Emergency Warning Message Broadcast Based on Rate Adaptation for Vehicle Ad hoc Network LIU Yan-long, LV Pin, CHEN Ying-wen, KUANG Luo-bei, XU Ming (School of Computer, National University of Defense Technology, Changsha 410073, China) 【Abstract 】In order to broadcast Emergency Warning Messages(EWM) in Vehicle Ad hoc Network(VANET) fast and reliably, this paper proposes a broadcast mechanism based on rate adaptation for VANET named BRAVE combing the technology of multiple interfaces with multiple channels. Simulation results reveal that BRAVE can reduce the transmission latency and rebroadcast redundancy of EWM, and increase the transmission reliability to guarantee the message delivery. Compared with the mechanisms that select the broadcast nodes in terms of bit-rate and transmission range, its transmission latency is reduced by 3.9% and 66.0% respectively. 【Key words 】Vehicle Ad hoc Network(VANET); rate adaptation; Emergency Warning Message(EWM); broadcast mechanism 1 概述 2 BRAVE 机制 车辆自组织网络(Vehicle Ad hoc Network, VANET)是一 2.1 假设与约束 种车辆之间、车辆与固定接入点之间相互通信组成的开放性 BRAVE 机制基于如下假设与约束： 移动 Ad hoc 网络。其节点通常高速移动且网络拓扑快速变