中文摘要：

研究了车载自组网中基于多描述编码技术和车载节点间通信距离的按需路由DSR技术。针对车载自组网络拓扑的动态变化、车辆高速运动、车辆运行方向及其速度不可预知等特点，基于AdHoc网络按需路由协议DSR，研究了一种能较好地应用于车载自组网路由技术。该技术采用多描述编码技术和车载节点剩余能量改进了DSR的路由发现和回复过程。车载节点根据信号的衰减程度判断车载节点之间一跳通信距离，源节点根据RREP消息中的信息选择主路径，采用多描述编码技术发送和接收路由消息降低了路由请求开销。仿真实验分析表明：改进的DSR路由技术在端到端时延、分组投递率和路由请求开销等方面具有良好的性能。

英文摘要：

A DSR routing technology based on multiple description code and communication distance of nodes for Vehicular Ad Hoe Networks is researched. The group for on-board the dynamic change of Ad Hoc network topology, vehicle high-speed motion, vehicles running direction and speed unpredictability, based on the Ad Hoc characteristics such as network on-demand routing protocols, a kind of DSR can be well applied in vehicle routing technology since networking. This technology, using multiple description coding technology and on-board node improved the process of finding and recovery in DSR routing technology. On-board node according to signal attenuation degree judge between a jump communication vehicle-mounted node distance, according to the RREP news source node, the main route information choose multiple description coding technology send and receive routing messages reduced route requests overhead. Simulation experiment analysis indicates that the improved DSR routing technology has better performance in average end-to-end delay, packet delivery ratio and route request overhead.