无线传感网中一种基于即时信息的TDMA方案

摘要

The medium access control(MAC)protocol has significant influence on the performance of wireless sensor net⁃works. According to the requirement of performance,taking account of the drawbacks of the current protocol in the time⁃delay and energy consumption,an instant⁃messaging based TDMA scheme is put forward. IM⁃TDMA improves channel utility by dy⁃namically changing the length of the TDMA frame according to the change of the node flow rate. The scheduling complexity was simplified and saves energy was reduced by using scheduling mode of coutner management and resume first. The simulation re⁃sults show that IM⁃TDMA scheme can improve channel utility and reduce the latency and energy consumption,so it can be used in wireless sensor MAC protocol scheme.%　　媒体访问控制（MAC）协议对无线传感网的性能具有重要影响。根据无线传感网在网络性能方面的要求，针对现有无线传感网协议在节点能耗和时延方面的不足，提出了一种IM⁃TDMA方案，根据节点流量的变化，动态地调节帧长，提高信道利用率；同时采用计数器管理及续传优先的调度方式，简化了调度复杂度，降低了节点能耗。仿真结果表明：IM⁃TDMA方案能有效地节约能耗、降低时延，可运用于实际无线传感网的MAC协议方案中。