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AQM controller design for TCP networks based on a new control strategy

机译：基于新控制策略的TCP网络AQM控制器设计

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摘要

When the network suffers from congestion, the core or edge routers signal the incidence of congestion through the active queue management (AQM) to the sources. The time-varying nature of the network dynamics and the complex process of retuning the current AQM algorithms for different operating points necessitate the development of a new AQM algorithm. Since the non-minimum phase characteristics of the network dynamics restrict direct application of the proportional-integral-derivative (PID) controller, we propose a compensated PID controller based on a new control strategy addressing the phase-lag and restrictions caused by the delay. Based on the unstable internal dynamics caused by the non-minimum phase characteristics, a dynamic compensator is designed and a PID controller is then allowed to meet the desired performance objectives by specifying appropriate dynamics for the tracking error. Since the controller gains are obtained directly from the dynamic model, the designed controller does not require to be tuned over the system operating envelop. Moreover, simulation results using ns2 show improvements over previous works especially when the range of variation of delay and model parameters are drastic. Simplicity, low computational cost, self-tuning structure and yet considerable improvement in performance are exclusive features of the proposed AQM for the edge or core routers.
机译：当网络出现拥塞时，核心或边缘路由器会通过活动队列管理（AQM）向源发出拥塞事件的信号。网络动力学的时变性质以及针对不同的工作点重新调整当前AQM算法的复杂过程，因此有必要开发新的AQM算法。由于网络动力学的非最小相位特性限制了比例积分微分（PID）控制器的直接应用，因此我们提出了一种基于新的控制策略的补偿PID控制器，该策略解决了相位滞后和延迟引起的限制。基于非最小相位特性引起的不稳定内部动态，设计了动态补偿器，然后允许PID控制器通过为跟踪误差指定适当的动态来满足期望的性能目标。由于控制器增益是直接从动态模型获得的，因此设计的控制器无需在系统工作范围内进行调整。此外，使用ns2进行的仿真结果显示出对以前工作的改进，特别是在延迟变化范围和模型参数变化很大的情况下。简单性，低计算成本，自调整结构以及性能上的显着提高是所提出的针对边缘或核心路由器的AQM的独有功能。

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