基于矩法估计量的无线传感器网络路由度量

采用有效的路由度量来计算开销是无线传感器网络路由协议设计的基础.首先通过实验研究,发现无线传感器网络的底层通信链路存在着丢包、非对称等特点,但是现今的路由度量大多是假设底层链路在理想的状况下提出来的;其次,通过测量无线传感器网络链路的正向与反向的包接收率,求出了二者之间的矩法估计量,并建议以此作为新的路由度量方法;接着,对传统的AODV协议进行了修改,将矩法估计量代替原有的最小跳数度量,并用NS-2进行了仿真,结果表明基于矩法估计量的路由性能比原有以最小跳数为度量的协议性能在端到端的吞吐量、丢包率等方面有了很大的改进.

Routing Metrics Based on Moments Estimates for Wireless Sensor Networks

Computing the overhead traffic by an effective route metric is the basis for devising route protocols in wireless sensor networks.It was found through experimental study that there are some characteristics in bottom-layer communication link of wireless sensor networks,such as packet loss and asymmetry.However,most of route metric are assuming that the bottom-layer communication link is ideal at present.So,the moment estimate is proposed as a new route metric by computing it between forward and backward packets receiving rates which were measured in the links of wireless sensor network.Then,the conventional AODV protocol is amended that the minimal hop metric in it is replaced by moment estimate.Results of simulation with NS-2 showed that the moment estimate is better than the original minimal hop for end-to-end throughput with packet loss rate greatly decreased.