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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 system with complex features such as multidimensionality, nonlinearity, dynamics and uncertainty, this paper proposes a new Active Queue Management (AQM) algorithm based on H∞ control theory from the control theory. The paper focuses on the analysis of RED algorithm. First, the dynamic model of AQM / TCP congestion control is established. Secondly, the asymptotic stability of the system is described by the linear matrix inequality (LMI), and the MATLAB generalized LMI toolbox is used to solve the general linear time-delay system with H∞control. Then, Applied to the RED, which came to the controller. Finally, a simulation experiment is carried out on NS2 platform. The experimental results show that this algorithm is effective in solving the robustness problem caused by system uncertainty.