基于SMAC的无线传感器网络MAC协议的分析与优化

摘要

首先对MAC协议进行了相关介绍.然后重点介绍了一种基于竞争的无线传感器网络MAC层协议S-MAC协议.其核心是提出了一种新的无线传感器网络的MAC协议设计方案.基于动态调整占空比的思想,提出了ATC-SMAC协议.该协议在S-MAC协议的基础上改进了固定占空比的劣势,根据每个节点上的数据包的平均延迟调整占空比.通过动态地调整每个节点的占空比,使不同流量的节点拥有不同的工作时间,协议根据不同节点的流量情况自适应地对其占空比进行调整.经过仿真试验,得到ATC-MAC在网络端对端延迟、能量消耗以及吞吐量方面较S-MAC协议都有比较明显的提高.%The MAC protocol is introduced. A wireless sensor network MAC layer protocol based on competition named S-MAC protocol is analyzed. The core of this paper is the design scheme of MAC protocol of a new wireless sensor network, and the ATC-SMAC protocol based on the dynamic adjustment of duty cycle is proposed. This protocol improved the disadvantages of fixed duty cycle of S-MAC, and used the strategy of adjusting the duty cycle according to average packet delay on one node. Nodes with different traffic owned different work time according the duty cycle dynamic adjustment of each node. The protocol dynamically adjusted the duty cycle according to the traffic of each node. According to the simulation, the ATC-MAC is better than S-MAC in end to end delay, energy consumption and throughput.