上海交通大学学报(自然版) ›› 2011, Vol. 45 ›› Issue (08): 1191-1195.

• 自动化技术、计算机技术 • 上一篇    下一篇

基于H∞控制的主动队列管理算法

侯萍1,2,王执铨1   

  1. (1.南京理工大学 自动化学院,南京 210094;2.南京人口管理干部学院,南京 210042)
  • 出版日期:2011-08-30 发布日期:2011-08-30

A New AQM Algorithm Based on H∞ Control

 HOU  Ping-1, 2 , WANG  Zhi-Quan-1   

  1. (1.School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China;2.Nanjing College for Population Program Management, Nanjing 210042, China)
  • Online:2011-08-30 Published:2011-08-30

摘要: 针对网络参数的不确定性和链路带宽的时变性,设计了一种主动队列管理(AQM)算法.该算法将可获得的链路带宽作为标称值,而不可获得的未知时变链路带宽作为干扰信号, 以状态空间的形式描述TCP/AQM模型,用时间域H∞控制方法解决网络拥塞问题.NS2仿真结果表明,该算法在往返时间时变和具有扰动业务流情况下,能够快速收敛于期望队列长度,且性能优于已有的控制算法.

关键词:  , H&infin, 控制, 网络拥塞, 往返时间, 不确定性参数

Abstract:  An active queue management algorithm was presented for network congestion, which is based on uncertain parameters and variable link bandwidth. The available link bandwidth is modeled as a nominal constant value, which is known to the link, plus a time-variant disturbance, which is unknown. The model of TCP/AQM including the state and the input delay was presented in state variables. Then, the network congestion problem is solved by using the time-domain H∞ control approach. The NS2 simulation results show that this algorithm is capable of achieving the desired queue length fast under the conditions of variable RTT and sudden traffic flow. The performances of the proposed algorithm increase greatly compared with the existing algorithm.

Key words: H&infin, control, congestion control, round trip time (RTT), uncertain parameters

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