TCP网络的自适应非奇异终端滑模控制

摘要

For the problem of congestion control in the TCP Internet, a novel active queue management ( AQM) algorithm based on the nonsingular terminal sliding mode control theory is proposed. A nonsingular terminal sliding mode surface is used to the singularity problem of conventional terminal sliding mode controls, so that the system can be guaranteed to converge to an equilibrium point.Considering UDP flow, an adaptive law based on Lyapunov stability method eliminates the effect from the disturbance of UDP flow. Simulation results demonstrate that the algorithm enables the queue length to converge to set value quickly, keeps the queue oscillation small, and outperforms the conventional IP control and sliding mode control.%针对TCP网络的拥塞控制问题,采用非奇异终端滑模控制理论提出了一种新的主动队列管理算法.采用非奇异终端滑模面以克服传统终端滑模控制的奇异问题,同时确保系统能在有限时间内收敛至平衡点.考虑到UDP流干扰的情况,用Lyapunov稳定性方法给出了一个自适应律来消除UDP流干扰对系统的影响.仿真结果表明,该算法可以使队列长度快速收敛到设定值,同时维持较小的队列振荡,优于传统的滑模控制.