基于DSR路由协议的跨层退避算法研究

摘要

IEEE 802.llDCF机制中的BEB退避算法由于简单易实现而被广泛应用.但是在网络繁忙时,BEB退避算法的局限性容易造成网络时延较大、丢包率较高,以至于网络性能降低.针对这种现象,提出了一种基于DSR路由协议的跨层退避算法(CBBD),利用DSR路由协议中的路由缓存特点,解决了信息流堵塞在某一些节点的问题.通过仿真实验验证,该算法大幅减小了时延和丢包率,使网络性能得到显著的提高.%BEB backoff algorithm of IEEE 802. 11 DCF mechanism is used usnally because it is easy to be carried out. Due to the limitation of BEB backoff algorithm in DCF mechanism, the network running busily might lead to the delay of transmission and the packets loss rate go up. To deal with the terrible situation, this paper presented a cross-layer backoff algorithm based on DSR routing protocol ( CBBD). The new algorithm used the cache of route in DSR routing protocol to solve the problem that the transmission jam at some of the nodes. Simulation proves that the algorithm reduces the transmission delay and packets loss rate largely to improve the performance of the network.