基于不确定时滞模型的鲁棒AQM控制器设计

针对网络环境的不确定性和网络参数的时变性,采用不确定时滞系统模型对网络拥塞控制问题进行了研究。给出了利用线性矩阵不等式方法判定主动队列管理(active queue management,AQM)系统稳定的充分条件,以及基于求解非线性矩阵不等式的AQM控制器参数设计方法,设计了基于线性矩阵不等式的含时滞静态输出反馈控制器。仿真结果表明,利用该方法所得到的控制器是有效的,在变化的网络环境下,其动态响应更快,稳态波动更小。

Robust AQM controller design based on uncertain time-delay model

To describe the uncertainness of network environment and the time-varying property of network parameters,an uncertain time-delay system model is established to carry out research on network congestion control.The sufficient condition is given to judge the stability of the active queue management(AQM) system by linear matrix inequality approach,and a method is also given to set parameters of an AQM controller based on nonlinear matrix inequality.The time-delay static output feedback controller is proposed based on linear matrix inequality.Simulation result shows that the controller designed by this approach is effective,and its dynamic response is faster and smoother in variable network condition.