Abstract: As for the problem of congestion control in Internet, based on sliding mode control theory and Takagi-Sugeno（T-S） fuzzy model, a fuzzy sliding mode congestion control scheme is put forward. Considering uncertainty and time-varying delay factors in Internet, a network model is obtained by T-S fuzzy model for network system. An asymptotically stable sliding surface is designed by Linear Matrix Inequality（LMI）. It can effectively compensate for the effect of uncertainty and time-varying delay factors. The controller is designed by the way of reaching law, which can effectively constrain oscillation of the queue length in router. Simulation contrasts in many scenarios demonstrate that the proposed control scheme possesses better stability and robustness.

Key words: Internet congestion control, sliding mode control, T-S fuzzy model, active queue management

摘要： 针对互联网中的拥塞控制问题, 基于滑模控制理论及T-S（Takagi-Sugeno）模糊模型，提出了一种模糊滑模拥塞控制策略。考虑到互联网中存在的不确定和时变时滞因素，采用T-S模糊模型对网络系统进行了建模。利用线性矩阵不等式设计了一个渐近稳定的滑模面，有效地补偿了不确定及时滞因素的影响。基于趋近律的方法设计了控制器，有效地抑制了路由器中队列长度的振荡。多种情况下的仿真对比表明，所提出的控制策略具有更好的稳定性和鲁棒性。

关键词: 互联网拥塞控制, 滑模控制, T-S模糊模型, 主动队列管理