基于无线传感器网络的混合MAC协议

Hybrid MAC Protocol Based on Wireless Sensor Network

结合载波侦听多路访问(CSMA)与时分多址(TDMA)的工作方式,提出一种基于无线传感器网络的混合介质访问控制(MAC)协议。引入快速冲突解决算法,对CSMA模式下的SMAC协议进行改进,使其争用窗口可以随着网络流量变化而动态改变,从而完成CSMA模式与TDMA模式的平滑切换。OMNeT++平台上的仿真结果表明,该协议能提高信道利用率,延长网络生命周期。

This paper proposes a hybrid Medium Access Control（MAC） protocol based on Wireless Sensor Network（WSN） by combining with the work pattern of Time Division Multiple Access（TDMA） and Carrier Sense Multiple Access（CSMA）. It Introduces Fast Collision Resolution（FCR） into MAC protocol. Sensor-MAC（SMAC） protocol is improved in the mode of CSMA. Under such condition, the contention window changes according to the changes of network traffic. The hybrid MAC protocol can switch the working way self-adaptively and smoothly between the mode of CSMA and TDMA. Simulation results on OMNet＋＋ show that the improved protocol can enhance the utilization efficiency of channel and prolong lifecycle of network.