摘要
研究了带有延迟时间补偿的模糊变结构控制算法 ,分析了模糊变结构控制中积分因子对于时延因子的补偿机理 ,并基于网络拥塞路由器中TCP连接的线性化模型设计了适用于主动队列管理的时延控制算法 .最后讨论了该控制算法的实现问题和参数整定 ,进行了仿真实验 .对于TCP主动队列管理的性能分析和比较试验表明 ,本算法在RTT和TCP会话数量变动时保持了良好性能和鲁棒性 ,在丢包率、吞吐量和缓冲波动方面相比其他类似方案有明显的性能优势 .
This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the congestion-avoidance flow-control mode of transmission control protocol (TCP), we present delay control algorithms for active queue management (AQM) and discuss the parameter tuning of the algorithms. The NS (network simulator) simulation results show that the proposed control scheme for the nonlinear TCP/AQM model has good performance and robustness with respect to the uncertainties of the round-trip time (RTT) and the number of active TCP sessions. Compared to other similar schemes, our algorithms perform better in terms of packet loss ratio, throughput and butter fluctuation.
基金
TheNationalHighTechnologyResearchand DevelopmentProgramofChina (863Program) (No .2 0 0 1AA12 10 42 ) .
关键词
时延补偿
模糊变结构控制
主动队列管理
鲁棒性
time delay compensation
fuzzy variable structure control
active queue management
robustness
