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本文针对基于SMAC协议的多跳无线传感器网络,将节点建模为一个带关闭机制的有限队列单服务台系统,并考虑节点睡眠机制和竞争退避机制建立了二维Markov节点状态模型.基于该模型可准确推导出网络平均丢包率、网络吞吐量、数据包平均延时以及网络平均功率消耗等网络性能的表达式.通过与仿真实验给出的网络性能结果进行对比,发现模型给出的网络性能表达式有效逼近了仿真结果曲线,从而验证了模型的准确性.同时,运用该模型能准确分析多跳无线传感器网络在能量效率和QoS性能的折中关系,并为占空比、缓存队列容量等网络协议参数的优化提供理论指导.
In this paper, SMAC-based multi-hop wireless sensor networks are modeled as a finite-queue single-help-desk system with a shutdown mechanism and a two-dimensional Markov node state model is established considering the sleep mechanism and competitive backoff mechanism of the node. Based on this model We can derive the expression of network performance such as average packet loss rate, network throughput, average packet delay and network average power consumption etc. By comparing with the network performance results given in the simulation, it is found that the network The performance expression effectively approximates the simulation result curve, which verifies the accuracy of the model.At the same time, the model can accurately analyze the compromise relation between energy efficiency and QoS performance of multi-hop wireless sensor networks, Capacity and other network protocol parameters to provide theoretical guidance.