无线传感器网络中一种竞争窗口自适应MAC协议

Contention window adaptive MAC protocol for wireless sensor networks

媒体访问控制(MAC)协议是保证无线传感器网络(WSNs)高效通信的关键网络协议之一。MAC层协议设计的是否合理将严重影响网络的性能。介绍了现有MAC协议分类和主要MAC协议。分析了WSNs中典型的S-MAC协议,针对S-MAC协议在载波侦听时采用固定竞争窗口的弊端,提出了一种新型的能够根据流量变化对竞争窗口进行动态调整的新的MAC协议ASMAC,利用NS2对ASMAC进行了仿真,证明了新的ASMAC不仅能够显著地提高吞吐量,降低时延,还能有效提高能量效率,在提高网络性能的同时达到节能的目的。

Media access control（ MAC）protocol is one of the key network protocol to ensure that wireless sensor networks （WSNs）high-performance communications. MAC layer protocol design is reasonable or not will seriously affect the network performance. Existing MAC protocal classification and the main MAC protocals are also introduced. The typical S-MAC protocol in wireless sensor networks is analyzed. Aimed to the defects of the use of fixed window when S-MAC carrier sense,a new MAC protocol,ASMAC,which can dynamic adjust the window by the change of the flow is proposed. NS2 is used to simulate ASMAC,which has proved that new ASMAC can not only dramatically improve throughput and reduce delay, but also effectively improve the energy efficiency. It can achieve the purpose of energy saving and improve network propertly at the same time.