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基于网络拥塞控制有效的主动队列管理算法(AQM),设计了一种鲁棒的离散滑模控制器(DSMC)。针对实际网络中离散化的采样系统和定期更新等运行特点,将TCP动态拥塞窗口模型离散化,考虑该模型存在的网络延迟及流量扰动等参数不确定等特点,采用鲁棒性较好的滑模控制器。在控制器的设计中,构造了包含起始点滑模面,缩短到达时间;假设不确定扰动的最大上界,采用等效控制设计控制律;然后给出了系统的稳定性分析。仿真结果表明该控制器能够获得较快的响应速度和稳定的队列长度,在网络参数变化时仍能获得很好的鲁棒性。
Based on Active Queue Management Algorithm (AQM) which is effective in network congestion control, a robust discrete sliding mode controller (DSMC) is designed. Aiming at the discrete sampling system and periodic update in the real network, the TCP dynamic congestion window model is discretized. Considering the characteristics of the model such as the network delay and the uncertainty of traffic disturbance, the robustness Model controller. In the design of the controller, the sliding mode surface containing the initial point is constructed and the arrival time is shortened. Assuming the maximum upper bound of the uncertain perturbation, the equivalent control is used to design the control law. Then, the stability analysis of the system is given. The simulation results show that the controller can achieve faster response speed and stable queue length, and still achieve good robustness when the network parameters change.