面向输电线路监测网络混合MAC协议改进方法  

An Improvement of MAC Protocol for Transmission Line Monitoring in Idle Period

作　　者：朱宝晖[1,2] 林俊如[1,2] 曾鹏[1] 汪扬[1,2] 张延宇[1,2] 匡方军[1,2] 

机构地区：[1]中国科学院沈阳自动化研究所工业控制网络与系统研究室,沈阳110016 [2]中国科学院大学,北京100049

出　　处：《小型微型计算机系统》2014年第5期1031-1036,共6页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61100159)资助;国家科技重大专项基金项目(2010ZX03006-005-01;2011ZX03005-002)资助;国家"八六三"高技术研究发展计划项目(2011AA040101;2011AA040103)资助;中国科学院知识创新工程重要方向性项目(KGCX2-EW-104)资助;中国科学院战略性先导专项项目(XDA06020500)资助

摘　　要：非均衡网络流量、局部密集网络拓扑等应用特征以及低能耗、高实时通信等应用需求给应用于输电线路监测网络的MAC设计提出了挑战.针对原应用与输电线路监测网络低流量时段的X-MAC协议的不足,通过引入同步操作、精确预估唤醒时刻,提出了SX-MAC协议.SX-MAC最大限度地减少网络中前导码报文的长度,节省了网络能量.通过分析SX-MAC协议的网络能耗,得出最优同步周期的理论值.又提出了占空比交错调度机制,优化上行数据的实时性.采用了OPNET进行了仿真验证,结果表明,在此应用背景下,SX-MAC协议比X-MAC协议能够更好地节约网络能量和满足网络实时性要求.仿真条件下最优的同步周期为15分钟.Application features such as non-equilibrium traffic and local intensive topology and application requirements such as low ener- gy consumption and high real-time communication make a challenge to MAC protocol design in the transmission line monitoring. Ai- ming at the deficiency of original X-MAC protocol used in the transmission line monitoring network during low-flow periods, SX-MAC protocol is designed through introducing synchronization and estimating waking up time accurately. SX-MAC can reduce the length of preamble packets and save energy to the maximum. The network energy consumption is analyzed, and thetheoretical value of optimal synchronization period is deduced. And duty cycle staggered scheduling mechanism is proposed to optimize real-time of upstream data. OPNET is used to emulate the performance of SX-MAC, and the results show that makes significant improvement than X-MAC both in energy efficient and real-time in this scenario. The optimal synchronization period is 15 rain under the simulation conditions.

关 键 词：输电线路监测 无线传感器网络 MAC SX—MAC 前导码报文 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]