突发性链路感知的自适应链路质量估计方法

摘要

A bursty-link-aware and adaptive link quality estimation method,named EasiLQE.was proposed. The beacon packets are sent by nodes in a long-term period to probe the link quality. Meanwhile,nodes passively measure the mean value of RSSI of received packets. If the mean value of RSSI is lower than a certain threshold,the EasiLQE initiates the link quality estimation process in a short-term period. Finally,the EasiLQE uses error-based filter to estimate the link quality in future. The experimental results show that the EasiLQE can react quickly and accurately to persistent link quality changes in a short time,and also can smooth the occasional link quality fluctuations,which are not acute,to keep the link quality estimator stable,and decrease the estimation costs.%提出了一种无线传感器网络中突发性链路感知的自适应链路质量估计方法EasiLQE.节点周期性地发送控制分组,采用长周期主动探测机制探测链路的质量；同时,节点被动侦听接收到分组的RSSI均值,当低于某-阈值时,触发短周期链路质量探测过程.最后节点使用基于误差的滤波器估计链路在未来一段时间内的质量.实验结果表明,EasiLQE既能实时准确地感知突发性链路在短时间内的持续变化,又能平滑短暂的低幅度波动而保持良好的稳定性,同时维持较低的估计开销.