IEEE802.15.6无线体域网CSMA/CA接入机制建模与性能分析

无线体域网是由附着在人体表的可穿戴传感器或植入人体内的生物传感器组成的无线网络.IEEE 802.15工作组于2012年正式发布了用于无线体域网的IEEE 802.15.6通信标准.该标准面向窄带通信主要采用支持QoS区分服务的时隙CSMA/CA接入机制.为深入理解该机制的内在特性,利用Markov链对饱和状态下的退避过程进行建模,并在此基础上分析了各个优先级的吞吐量、成功收包率和延迟等性能.仿真结果验证了模型分析的准确性.分析和仿真结果表明,该标准为不同优先级提供了区分服务,但在饱和状态下最高优先级会抢占大部分信道资源,造成其他优先级的资源短缺.

Modeling and Performance Analysis of the CSMA/CA Access Mechanism for IEEE 802.15.6 Wireless Body Area Networks

Wireless body area network (WBAN) is a network of wearable or implanted sensors around or inside human body. In 2012, the IEEE 802.15 Working Group developed a new communication standard IEEE 802.15.6 specifically for WBAN. The primary medium access control technique defined in this standard for narrow-band communication is slotted CSMA/CA mechanism supporting differentiated QoS service. To understand the intrinsic nature of this mechanism, the backoff procedure under saturation condition is modeled by Markov chain so that throughput, successful packet delivery rate, and delay are analyzed. Simulation results confirm the accuracy of the model analysis. Both analysis and simulation results show that this standard provides differentiated service for different priorities, however, also indicates that under saturation condition the medium is mostly preempted by the highest priority while starving other priorities.