基于链路质量的无线传感器网络路由量度研究

Study on Combined Routing Metric Based on Link Quality for Wireless Sensor Networks

选择合适的路由量度对于提高无线传感器网络的路由效率而言至关重要。综述了现有无线网络几种典型的路由量度,并通过实验研究,发现了无线传感器网络的通信链路存在着高丢失率、非对称性等特点;进而分析了采用传统单一的路由量度方法在设计无线传感器网络路由协议时存在的不足;通过定义链路连接门限β,提出了一种基于Hops与ETX相结合的混合路由量度方法;将此路由量度方法应用于AODV协议中,仿真结果表明所提出的混合路由量度是一种高吞吐量,低丢失率的量度方法,能够为无线传感器网络高效路由协议的设计提供有价值的参考。

Selecting a suitable routing metric is very important for improving the routing performance of wireless sensor networks. A summary to the existing routing metrics was made and the several key characteristics of wireless sensor networks communication link, such as high loss rate, obvious asymmetry, were found according to the experimental study. Then, It was analyzed that it was deficient to design routing protocols for wireless sensor networks based on a single routing metric and a new combined routing metric was produced based on Hops and ETX according to defining a link connected threshold, denoted as l~. The routing metric was adopted to improve the traditional AODV routing protocol. Simulation results show that the combined routing metric is an excellent routing metric with high throughput and low loss ratio and can provide valuable reference to design efficient routing protocols in wireless sensor networks.