基于H_∞控制理论的网络拥塞控制器的设计  

Controller Design for Network Congestion Based on H_∞ Control Theory

作　　者：赵雪梅[1] 牛秦洲[1] 侯辉[1] 

机构地区：[1]桂林工学院电子与计算机系,广西桂林541004

出　　处：《通信技术》2009年第5期161-163,166,共4页Communications Technology

基　　金：广西科技攻关基金资助项目(桂科攻0537020-4)。

摘　　要：针对具有多维性、非线性、动态性、不确定性等复杂特征的计算机网络系统,文章从控制理论出发,提出了一种基于H∞控制理论的主动队列管理(AQM)算法,文章着重分析RED算法。首先,建立了AQM/TCP拥塞控制的动态模型;其次,系统的渐进稳定由线性矩阵不等式(LMI)描述,并应用MATLAB的LMI工具箱求解H∞控制的一般线性时滞系统;然后将求解结果应用到RED中,从而得出了控制器。最后在NS2平台上进行了仿真实验,试验结果表明,该算法在解决系统不确定性引起的鲁棒性问题上是有效的。Aiming at the computer network with multidimension, nonlinearity, dynamic, uncertainty, an H control approach to the active queue management （AQM） algorithm is proposed from control theoretic viewpoint. The paper focuses on RED. First, a dynamic model of AQM/TCP congestion control is constructed; then the asymptotical stability of the system is described by linear matrix inequalities（LMI） , and the H∞eontrol for the general linear time-delay is solved by LMI toolbox in the MATLAB; then, the result is applited to the RED and the controller is obtained; Finally, the research is simulated on the NS2 platform, and the result shows that this algorithm could effectively solve robustness problem caused by uncertainty.

关 键 词：H∞控制 算法 拥塞控制 线性矩阵不等式 线性时滞系统 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]