文献类型：期刊文献

中文题名：一种自适应PI—模糊切换策略的无线网络拥塞控制机制

英文题名：Congestion Control Mechanism for Wireless Networks Based on Switching Strategy of Adaptive PI and Fuzzy Control

作者：胡源[1];牛玉刚[1];贾廷纲[2]

机构：[1]华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海200237;[2]上海电气集团股份有限公司自动化事业部,上海200070

年份：2014

卷号：26

期号：3

起止页码：596

中文期刊名：系统仿真学报

外文期刊名：Journal of System Simulation

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金项目(61273073;61374107)

语种：中文

中文关键词：无线网络;拥塞控制;自适应PI;模糊控制;切换策略

外文关键词：wireless networks; congestion control; adaptive PI; fuzzy control; switch strategy

摘要：无线网络具有参数时变、资源受限等特点,容易发生拥塞。针对这一情况,设计了一种基于自适应PI—模糊控制切换的拥塞控制算法。该算法将根据网络拥塞程度的不同采取不同的控制策略,以满足无线网络在不同状况下的拥塞控制性能要求。在网络状况良好时,不采取控制策略以节省算法执行的开销,节省网络的能量;在网络轻度拥塞时,采用自适应PI控制保证了算法的稳态性能;在网络重度拥塞时,切换到模糊控制,能使网络快速恢复到非拥塞状态,保证了算法的快速性。算法中自适应调整PI参数的方法和模糊控制策略保证了对网络的时变特性的适应性。仿真结果表明,算法能使网络瓶颈节点的缓存队列长度保持在理想的范围内。
In wireless network applications, these characteristics, e.g., time-varying parameters and limited resources, may inevitably result in the network congestion. In this work, by integrating adaptive PI with fuzzy control technique, a switching algorithm was proposed for the congestion control of wireless networks, in which different control strategy would be taken according to the status of the network. When the network works under the better condition, no control act will be taken in order to save energy. When the extent of congestion is lower, this algorithm will adopt the adaptive P1 control to ensure the steady performance of the networks. However, if the congestion becomes sheave, this algorithm will switch to the fuzzy control so that the networks can restore from the congestion phenomenon rapidly. By resorting to the adaptive updating of P1 parameters and the fuzzy technique, this proposed algorithm can effectively ensure the adaptivify of wireless network to time-varying features. It has been shown from the simulation results that the present algorithm can keep an appropriate the buffer queue length for the bottleneck node of the wireless network.