计算机工程 ›› 2009, Vol. 35 ›› Issue (15): 114-116.doi: 10.3969/j.issn.1000-3428.2009.15.039

• 网络与通信 • 上一篇    下一篇

具有输入和状态延时网络系统的鲁棒拥塞控制

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)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-08-05 发布日期:2009-08-05

Robust Congestion Control for Input and State Delay Network Systems

HOU Ping1,2, WANG Zhi-quan1   

  1. (1. School of Automation, Nanjing University of Science & Technology, Nanjing 210094; 2. Nanjing College for Population Programme Management, Nanjing 210042)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-08-05 Published:2009-08-05

摘要: 研究基于状态空间的主动队列管理算法,以状态变量的形式描述具有状态延时和输入延时的TCP/AQM模型,设计基于观测器的状态反馈控制器,观测器在线测量控制器的输出。应用线性矩阵不等式和Lyapunov-Krasovskii定理,给出AQM控制器的控制率和不依赖于延时的稳定条件。NS2仿真表明该控制算法在延时变化和突发业务流情况下,能够快速收敛于期望队列长度,动静态性能优于已有的PI控制算法。

关键词: 主动队列管理, 延时, 观测器, 线性矩阵不等式, Lyapunov-Krasovskii理论

Abstract: Active Queue Management(AQM) algorithm based on state space is studied in this paper. The model of TCP/AQM including the state and the input delay is presented in state variables. State feedback control based observer is introduced to estimate online output of congestion control for AQM router. According to the Linear Matrix Inequality(LMI) technique and the Lyapunov-Krasovskii theorem, control laws and delay-independent stability criteria for the AQM controllers are derived. The NS2 simulation results show that this algorithm is capable of achieving the desired queue length fast under the two conditions of delay change and sudden traffic flow. The performance of the proposed algorithm increases greatly compared with the existing PI control algorithm.

Key words: Active Queue Management(AQM), delay, observer, Linear Matrix Inequality(LMI), Lyapunov-Krasovskii theorem

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