摘要
针对具有输入时滞的TCP网络的拥塞控制问题,提出了一种基于自适应滑模控制的主动队列管理算法。通过引入一个状态预测器,消除输入延时带来的影响。考虑到网络系统不确定性上界很难获得,提出了一种自适应律以适应系统的不确定的上界,并根据此自适应律设计了一个滑模控制器。所设计的控制器既保证了滑动模态的存在和系统的渐进稳定性,又较好地抑制了系统不确定带来的影响。仿真结果表明,该算法可以获得良好的暂态和稳态响应,该方法优于传统的PID控制和滑模控制。
For the problem of congestion control in TCP networks with input-delay,an active queue management algorithm is presented based on an adaptive sliding mode control.A state predicator is used to eliminate the impact of input delay.Considered the upper bound of the network system uncertainties may not be easily obtained,a simply adaptive law for the upper bound of system uncertainties is presented and a sliding mode controller is designed according to that adaptive law.An AQM controller is derived to both ensure the existence of a sliding mode on the surface and asymptotic stability of the network system,and eliminate the effects of system uncertainties.Simulation results demonstrate that this algorithm can obtain good transient and steady state responses, and the algorithm is superior to the traditional PID control and SMC.
出处
《科学技术与工程》
2011年第1期67-70,共4页
Science Technology and Engineering
关键词
TCP网络
拥塞控制
主动队列管理
自适应滑模控制
输入时滞
TCP networks congestion control active queue management adaptive sliding mode control input-delay
