Robust Active Queue Management for Wireless Networks
Robust Active Queue Management for Wireless Networks
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DOI：
10.1109/tcst.2010.2081671
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发表时间：
2011-11
影响因子：
4.8
通讯作者：
Kanchan Chavan;Ram G. Kumar;M. Belur;A. Karandikar
中科院分区：
文献类型：
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作者：
Kanchan Chavan;Ram G. Kumar;M. Belur;A. Karandikar
在有线网络的背景下，主动队列管理(AQM)算法已在文献中被广泛研究。本文对无线网络中的主动队列管理进行了研究。与假定具有固定容量的有线链路不同，无线链路具有因衰落而随时间变化的容量。因此，在存在这些容量变化的情况下，控制器需要满足性能目标。我们提出了一种使队列长度保持在工作点附近的鲁棒控制器设计。将容量变化视为外部扰动，利用H-∞控制技术设计了一种鲁棒控制器。在我们的模型中还考虑了往返时间的影响。我们的方法将延迟合并到离散化模型中，通过允许直接使用系统控制器设计方法和/或设计包来简化控制器设计。通过ns-2仿真验证了控制器对负载条件和往返时间变化的鲁棒性。
Active Queue Management (AQM) algorithms have been extensively studied in the literature in the context of wired networks. In this paper, we study AQM for wireless networks. Unlike a wired link, which is assumed to have a fixed capacity, a wireless link has a capacity that is time-varying due to fading. Thus, the controller is required to meet performance objectives in the presence of these capacity variations. We propose a robust controller design that maintains the queue length close to an operating point. We treat capacity variations as an external disturbance and design a robust controller using H∞ control techniques. We also consider the effect of round-trip time in our model. Our method of incorporating the delay into the discretized model simplifies controller design by allowing direct use of systematic controller design methods and/or design packages. We demonstrate the robustness of the controller to changes in the load condition and in the round-trip time through ns-2 simulations.