移动ZigBee节点无线传感器网络建模与性能仿真研究

Research on Modeling and Performance Simulation of Mobile ZigBee Node Wireless Sensor Networks

在如智慧医疗等众多ZigBee无线传感器网络应用中,网络节点的移动常常不可避免,为保证移动节点在网络中的泛在通讯能力,研究节点移动引起的网络性能变化十分重要。论文首先对OPNET仿真开发平台的网络层进程域模型进行改进,利用状态转移过程模拟节点移动进程特性,优化节点路由协议,改善基于OPNET的ZigBee无线传感器网络模型组网能力及网络阻塞状况。其次,仿真研究移动节点数量、移动节点速度对三种拓扑结构ZigBee网络的MAC负载、MAC延迟、端到端延迟性能的影响。仿真结果表明,随着移动节点数量以及速度的增加,簇状ZigBee网络负载承受能力最好,星型ZigBee网络在延迟方面表现出更大优越性,综合考虑负载和延迟两方面性能,网状ZigBee网络具有更大的优势。

In many ZigBee wireless sensor network applications such as smart medical care,the movement of network nodes is often inevitable. To ensure the ubiquitous communication capability of mobile nodes in the network,it is very important to study the network performance changes caused by node movement. In this paper,the network layer process model of OPNET simulation development platform is improved firstly,the state transition process is used to simulate the characteristics of node mobile processes,the node routing protocol is optimized,and the networking capabilities and network congestion of the ZigBee wireless sensor network model based on OPNET are improved. Secondly,the effects of the number of mobile nodes and the speed of mobile nodes on the MAC layer load,MAC layer delay,and end-to-end delay performance of the three topology ZigBee networks are simulated. The simulation results show that as the number of mobile nodes increases and the speed increases,the cluster ZigBee network has the best load bearing capacity,the star ZigBee network shows superiority in terms of delay,considering both load and delay performance,the mesh ZigBee network has a bigger advantage.