Abstract: Due to the inherent stringent bandwidth and energy constraints，a link loss rate inference method applied to wireless sensor network is proposed.According to the sequence of data loss/receipt collected in the sink，the problem is formulated as a Maximum-Likelihood Estimation problem and is solved using the Expectation-Maximization algorithm.Simulation results demonstrate that the proposed methodology can infer the loss rate of packet accurately without any burden on network，and scale to networks size.

摘要： 针对传感器网络能源有限的特征，提出一种适用于传感器网络的链路报文丢失率测量方法。根据在汇聚节点（sink）获取的网络数据报文，将链路报文丢失率推测形式化为MLE问题并用EM算法解决推测问题。仿真试验证明，算法在不增加网络负担的前提下，能够有效地推测链路的报文丢失率；随着网络规模的扩大，算法仍能准确地反映网络内部的链路性能。