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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >Design of Adaptive PI Rate Controller for Best-Effort Traffic in the Internet Based on Phase Margin
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Design of Adaptive PI Rate Controller for Best-Effort Traffic in the Internet Based on Phase Margin

机译：基于相位裕度的Internet尽力而为流量自适应PI速率控制器的设计

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摘要

In this paper, we propose an adaptive PI (Proportional-Integral) rate controller for the AQM (Active Queue Management) router that would support best-effort traffic in the Internet. Unlike most window-based controllers, our rate-based controller design is derived from the classical control theory and it would allow the users to achieve good stability robustness of the AQM control system by specifying a proper phase margin. We also make our controller adaptive by selecting a simple heuristic parameter to monitor the network environment real-time so that the controller will self-tune only when a dramatic change of the network traffic has drifted the monitoring parameter outside its specified interval. Located in the router, the adaptive PI rate controller calculates desirable source window sizes (i.e., source sending rates) based on the instantaneous queue length of the buffer and advertises it to the sources. Our simulations demonstrate that our AQM control system can adapt very well to sudden changes in network environment, thus providing the network with good transient behavior. By making the source sending rate relatively smooth, our adaptive PI rate controller becomes quite suitable for streaming media traffic control in the Internet.
机译：在本文中，我们为AQM（主动队列管理）路由器提出了一种自适应PI（比例积分）速率控制器，该控制器将支持Internet上的尽力而为流量。与大多数基于窗口的控制器不同，我们基于速率的控制器设计源自经典的控制理论，通过指定适当的相位裕度，用户可以实现AQM控制系统的良好稳定性。我们还通过选择一个简单的启发式参数来实时监控网络环境，从而使控制器具有自适应性，从而使控制器仅在网络流量的急剧变化使监控参数偏离其指定间隔时才进行自我调整。自适应PI速率控制器位于路由器中，它基于缓冲区的瞬时队列长度来计算所需的源窗口大小（即源发送速率），并将其通告给源。我们的仿真表明，我们的AQM控制系统可以很好地适应网络环境的突然变化，从而为网络提供良好的瞬态行为。通过使源发送速率相对平稳，我们的自适应PI速率控制器变得非常适合Internet中的流媒体流量控制。

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