LQI Based Link Evaluation Algorithm and Its Application in Wireless Sensor Networks

Communication quality evaluation is crucial to upper-layer protocols' design in wireless sensor networks.A link evaluation algorithm based on mean LQI is proposed by comparing some link quality evaluation parameters.This algorithm can reduce redundant data for energy saving under the precondition of ensuring evaluation precision.Then,an improved ETX(IETX) routing metric is presented,through the new link evaluation algorithm.The performance of the IETX metric is tested with the Micaz nodes as platform,and the result shows the reliability and energy saving effect of IETX metric.