移动自组网路由协议DSR性能评价

PERFORMANCE EVALUATION OF DSR ROUTING PROTOCOL IN AD HOC NETWORKS

研究移动自组网的难点之一是开发能够跟随网络拓扑变化 ,在移动节点之间快速找到有效路径的路由协议。DSR协议作为一种简洁有效的按需机制路由协议 ,成为IETF的MANET工作组提出的草案之一。本文利用MANET工作小组推荐的Ns2仿真软件对DSR进行模拟 ,从源节点个数、分组发送频率、移动速度、节点密度、节点个数五个方面分析DSR的性能 ,指出对DSR性能影响最大的因素。分析随分组频率降低协议性能下降是由于它的路径缓存策略引起 ,提出将针对DSR路径缓存 ,搜索 ,抛弃策略进行改进。

One of the key challenge in mobile ad hoc networks is to develop an effective routing protocol which can follow the dynamic topology of the networks due to nodes mobility.Dynamic Source Routing protocol(DSR),which operates entirely on-demand has been an Internet-Draft of IETF.In this paper,using the Ns2 network simulator,the performance evaluation of DSR has been accomplished from five aspects:the number of source nodes,packets sending rate,mobile speed,density of nodes,number of nodes.The primary factors which effect the performance of DSR are pointed out.This paper aims at the phenomenon that the performance of the networks became to be worse with the reduction of the packet sending rate and indicates that it is caused by the disadvantage of DSR routing caching strategy.In future we will put forward improved strategies of caching,searching and discarding routes in the DSR route cache.