摘要： 为确定ZigBee是否适合数据密集型的身体传感器网络,对ZigBee的性能进行实验评估。在争用情况下,对星型和树型拓扑结构的身体传感器网络进行数据传输率和端到端的延时测试,对时钟漂移和隐藏节点的影响进行建模并通过实验加以验证。评估结果表明,启用ACK机制,在星型拓扑结构中,没有隐藏节点的ZigBee网络可靠性较好,传输率接近100%;在树型拓扑结构中,由于路由器过载和高流量负载激活路由维护协议导致性能下降,在不启用ACK机制的情况下,传输率最差为13%。因此,要将ZigBee协议应用于身体传感器网络,还需要一种机制来分配由数据密集型设备产生的流量负载,避免网络性能下降。

关键词: ZigBee协议, 身体传感器网络, 性能评估, 服务质量, 传输率, 时钟漂移

Abstract: In order to determine the suitability of ZigBee in data-intensive Body Sensor Networks(BSN) and to evaluate the performance of ZigBee,the Delivery Ratio(DR) and end-to-end delay are evaluated,for BSN with body sensor networks star and tree topologies,under the contention environment.The effect of the devices’ clock drift and hidden nodes on the reliability of the star network is modeled and validated through experimental tests.The reliability of the ZigBee network in a star topology without hidden nodes is very good(DR close to 100%).The performance in a tree topology is declined,due to router overload and the activation of the route maintenance protocol triggered by periods of high traffic load.The worst case DR decreased to 13%,while for the non-acknowledged mode.Therefore,to apply ZigBee protocol to BSN,a mechanism to distributing the nodes’ traffic over the time is required to avoid the performance degradation of BSN.

Key words: ZigBee protocol, Body Sensor Network(BSN), performance evaluation, Quality of Service(QoS), Delivery Ratio(DR), clock drift

中图分类号: 

• TP39