Robust Active Queue Management for Wireless Networks

被引:39
作者
Chavan, Kanchan [1 ]
Kumar, Ram G. [1 ]
Belur, Madhu N. [1 ]
Karandikar, Abhay [1 ]
机构
[1] Indian Inst Technol, Dept Elect Engn, Powai Mumbai 400076, Maharashtra, India
关键词
Congestion control; discretization; H-2; control; H-infinity control; robust control; wireless network; SUPPORTING TCP FLOWS; CONGESTION CONTROL; DESIGN;
D O I
10.1109/TCST.2010.2081671
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
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-infinity 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.
引用
收藏
页码:1630 / 1638
页数:9
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