摘要： 针对无线多媒体网络提出一种基于链路生存时间的多路径源路由协议。采用基于业务区分的路由发现过程，使得多媒体数据源比普通业务数据源具有更大的概率发现多条链路不相交的路径。利用链路生存时间尽可能地为数据包选择尚未中断的路径，链路中断检测机制区分由于拥塞而导致不必要的路由更新。仿真实验结果表明，与DSR相比，该路由协议较好地改善了实时多媒体的播放质量，并且降低了网络开销。

关键词: 无线移动自组织网络, 多路径, 性能评价

Abstract: This paper proposes a Link-Lifetime based Multipath Source Routing(LTMSR) protocol for multimedia traffic over Mobile Ad Hoc Networks(MANETs). Two different classes of routing discovery processes are deployed for multimedia traffic and non-multimedia traffic respectively. The former is assigned with a higher possibility to discover link-disjoint multipath than the latter. The routing protocol chooses route for packets in consideration of path lifetime to prevent from transmitting over already broken-routes. The link-broken detection mechanism distinguishes the cause of a lost frame properly, and coordinates with the routing protocol to avoid unnecessary route updating. Simulation results demonstrate that the LTMSR improves the quality of multimedia playing significantly, in terms of decodable frame ratio and end-to-end frame delay. In addition, route overhead is reduced.

Key words: Mobile Ad Hoc Networks(MANETs), multipath, performance evaluation

中图分类号: 

• TP393