无线传感器网络多时间尺度链路估计算法研究

摘要

针对无线传感器网络链路存在的不稳定性和不对称性问题,提出多时间尺度链路估计算法,通过长期和短期两种时间尺度估计节点间的链路质量,构建稳定链路和突发链路共存的拓扑结构,并采用突发链路发现策略实现机会路由;同时又针对由突发链路的不对称性引起的复制数据包问题,提出了多路径ACK策略,通过稳定链路和突发链路共同形成的多条路径传递ACK,提高ACK的到达率,减少复制数据包的数量.实验结果证明,多时间尺度链路估计算法使无线网络的平均路径长度减少且在一定程度上能节省能量并提高包接收率,同时多路径ACK策略也很好的解决了包复制问题.%According to the link instability and asymmetry of wireless sensor network, the multiple time scales link estimation (MTSLE) algorithm which takes into account long and short time scales link estimation is proposed.ln MTSLE, building the topology structure by both stable link and bursty link,a bursty links discovery strategy is designed to achieve opportunistic rouling. Meanwhile,the algorithm also considers a multi-path ACK policy for packet duplication cause by the asymmetry bursty links,reduces the number of duplicate packets. Experimental results show that MTSLE algorithm not only reduces the average path length but also saves energy and improve the packet reception rate to some extent, while nulti-path strategy also solves the problem of packet duplication.