面向输电线路监测的Ad Hoc网络中最小竞争窗口优化策略研究

Optimization strategy of minimum contention windows in Ad Hoc network for power transmission line monitoring

输电线路监测系统是电网监控的重要组成部分,需要在各种复杂环境下可靠运行。Ad Hoc网络作为坚强的自组织网络,其所具有的自愈性、抗毁性等特性非常适合应用在输电线路监测系统中。该网络MAC层所采用的IEEE 802.11 DCF机制对整个网络的性能有着重要影响。根据输电线路线性拓扑结构的特点,基于退避过程Markov模型的分析,提出了最小竞争窗口优化策略。该策略能根据各节点所处竞争环境的不同,设置相应的最优竞争窗口。仿真结果表明,该优化策略可显著提高系统吞吐量,系统时延也有一定改善,这对输电线路监测网络的性能提升有着重要的理论意义和应用价值。

Transmission line monitoring is an important part of the grid monitoring, which needs running reliably in various complex environments. Ad Hoc network, as a strong self-organization network with the characteristics of self-healing and anti-destroying, is particularly suitable to those transmission line monitoring systems. MAC layer technologies using IEEE 802. 11 DCF mechanism have an important effect on the performance of the Ad Hoc network. In this paper, according to the linear topological structure of the transmission line, an optimization strategy of minimum contention windows is presented based on Markov model of the backoff process. By this strategy, nodes under different competitive environments can be set with the optimal competition window respectively. By simulation, it shows that the system throughput can be improved obviously, and system delay will become much better. For the performance improvements of the transmission line monitoring network, it has important values in both theory and application.