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Dynamic Network Systems Research and Development of Embedded Controller

Author: WangZuo
Tutor: SunPing
School: Shenyang University of Technology
Course: Control Theory and Control Engineering
Keywords: Nonlinear TCP Dynamic Network Systems Adaptive Robust Control Nonlinear L 2 gain performance indicators Embedded Router
CLC: TP393.06
Type: Master's thesis
Year: 2012
Downloads: 22
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With the rapid development of the network, the network has gradually expanded the scale, the amount of network data transmission is constantly increasing, resulting in network congestion problems growing, people on the network transmission quality requirements are also rising. Network congestion, network transmission delay is the network transmission problems in the two research hotspot. Active Queue Management (AQM) is a network congestion control algorithm is effective, and is also the most widely used algorithm, it is through the expected queue length maintained to achieve lower router packet loss rate, to improve queuing delay to improve network performance, control network congestion and improve network transmission quality of service. Thesis, nonlinear control theory, proposed three active queue management algorithm design, control network system instantaneous queue length, queue length to achieve the desired retention, improve network congestion, latency, and enhanced nonlinear TCP Dynamic Network Systems stability. Thesis contents can be summarized as follows: First, we study a class of nonlinear dynamic network system TCP robust control problem. Considering the actual network environment in the presence of interference, the introduction amount of interference, the existing TCP nonlinear dynamic network system model is improved, the design of an appropriate coordinate transformation and evaluation of signals and energy storage function is constructed, and seek to meet Nonlinear L2 gain robust controller to realize the system interference effectively suppressed. Secondly, we study a class of nonlinear delay characteristics TCP dynamic network system robust control problem. By contrast to the existing models, algorithms evolved in Jacobsion nonlinear dynamic TCP network system model introduced amount of the delay, and taking into account the interference of the nonlinear robust controller design. Through simulation, the controller delay inherent in the system, as well as outside interference situation remains the system can be effectively controlled, allowing the system to achieve the desired queue length to maintain, guarantee system is asymptotically stable. Once again, a class of nonlinear dynamic network system TCP Adaptive Robust control problem. Taking into account various parameters in the network environment of uncertainty, the design of adaptive robust controller. The controller according to real-time network to update the congestion controller parameters, the parameters during operation based on changes in the adaptive law line, greatly improving the network performance. Finally, the use of embedded test box for papers adaptive robust controller designed for embedded router development.

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