基于LMI方法的鲁棒AQM控制器设计

研究了因特网拥塞控制中的鲁棒主动队列管理(AQM)控制器设计问题. 基于Internet传输控制协议(TCP)拥塞避免机制的线性模型,根据AQM的设计要求, 首先将此问题转化为鲁棒镇定问题;然后利用线性矩阵不等式(LMI)方法得出了动态输出反馈控制器存在的充分条件,并给出了相应的设计方法. 最后,给出了控制器设计的算例并进行了仿真. 仿真结果表明所得出的控制器是可行和有效的,它不仅对全部网络参数鲁棒而且过渡时间短.

AQM controller design based on LMI approach

This paper studied the problem of robust active queue management (AQM) controller design in Internet congestion control. The problem was first reduced to a robust stabilization one based on the linear model of transmission control protocol (TCP) and the AQM design objectives. A sufficient existence condition of the output feedback controller was then obtained and its design method was provided using linear matrix inequality (LMI) approach. Finally, a design example was given and the simulation was performed . The simulated results show that the proposed controller is feasible and valid for it possesses not only robustness for all the network parameters but fast settling process.