一种基于优先级的无线传感器网络实时MAC协议

Real-time MAC protocol of wireless sensor networks based on priority

MAC(Medium access control)协议直接影响着无线传感器网络能量的有效性和实时性,对此,提出一种基于公平优先级的MAC(FP-MAC)协议.该协议对不同类型的网络数据流设置不同的优先级,以保证较高优先级的数据能够实时传输;根据网络负载自适应地调节占空比,实现了低能耗与低时延.分析及实验表明,协议给出了时延上限,提供了实时性及可扩展性,同时保证了不同优先级之间的公平性,能够很好地适应具有实时性要求的无线传感器网络应用.

Medium access control（MAC） directly effects the energy efficicy and the real-time in wireless sensor network.This paper studies the state of the art of current real-time MAC protocols,and then introduces a distributed medium access control protocol that provides multiple priority levels.The channel is accessed by stations according to their priorities,and for stations with the same priority,frames are sent in a round manner.The fairness between different priorities is provided.The datum with higher priority can be sent in the real time.So the protocol guarantees lower energy consume and lower time delay.The Simulation and experiment results indicate that the protocol provides high channel utilization and bounded delays for real-time frames,and can be applied in the many fields.