基于服务质量的无线传感器网络MAC协议模型研究

Research of wireless sensor networks MAC protocol model based on QoS

无线传感器网络高性能通信要求MAC协议具有服务质量(QoS)保障功能,以满足数据传输实时性和可靠性需求。针对通过增加额外通信开销实现MAC协议QoS功能所导致传输性能降低的问题,提出一种基于分类优先不公平信道竞争访问的UC-MAC协议,通过节点状态、信道状态和网络状态分析,建立MAC协议多优先数据传输性能分析数学建模,并仿真验证了UC-MAC协议的QoS保障功能和数学模型的准确性。与其他MAC协议对比仿真测试结果表明,UC-MAC协议不改变IEEE802.15.4标准信道访问方式,不增加任何额外通信开销,在网络的吞吐性能和QoS功能两个方面同时得到提升。

MAC protocol that provides quality of service （QoS） which satisfy the real-time and reliability transmission requirement is the base of high-performance network application. Current MAC protocol researches on IEEE802.15.4 standard realize QoS function at the expense of decreasing communication performance. Therefore, according to the delay and reliability QoS requirement of transmission data, A MAC protocol called UC-MAC based on unfair contention channel accessing between classified data and a mathematics modeling method support muhipriority traffic of MAC protocol are proposed in this paper. The performance of UC-MAC and the accuracy of mathematical model are verified by simulation. Comparing other MAC protocol with QoS, UC-MAC improves both the performance of networking throughput and delay without any increase of additional traffic.