缓存技术是影响按需路由协议性能的关键因素,如何组织缓存结构并及时更新缓存信息是缓存技术目前的主要研究方向。本文分析了DSR协议两种缓存存储结构,路径缓存和链路缓存,提出了一种针对链路缓存的链路生命周期的预测方法,并使用OPNET对使用了链路生命周期预测方法后的DSR协议进行仿真分析,结果表明新的协议比原协议在包传输率、平均端到端时延和路由开销方面都有所改善。 Cache technology is the key factor that affects the performance of on-demand routing protocol. How to organize the cache structure and update the cache information in time is the main research direction of cache technology. This paper analyzes two kinds of cache storage structure, path cache and link cache of DSR protocol, proposes a link life cycle prediction method for link caching, and uses OPNET to analyze the link life cycle prediction method using DSR The simulation results show that the new protocol has better performance than the original one in terms of packet transmission rate, average end-to-end delay and routing overhead.