Robust active queue management design: A loop-shaping approach

Authors:
S. M. Mahdi Alavi;Martin J. Hayes
Affiliations:
Wireless Access Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Ireland;Wireless Access Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Ireland
Venue:
Computer Communications
Year:
2009

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Abstract

In this paper, a novel systematic design procedure is presented for robust active queue management (AQM). The congestion control law is obtained through an interactive loop-shaping process that manipulates the system frequency response to meet robust stability and performance requirements in the presence of uncertain network conditions. A sufficient condition leading to a satisfactory level of robust performance against high-frequency parasitics that naturally affect the desired requirements is then derived. A feature of the technique is that the uncertain phase information and round-trip time-delay that are inherent to the system dynamics are fully addressed in the design equations, resulting in minimal conservatism and/or over-design. Simulation results using the ns2 simulator are provided to illustrate the effectiveness of the proposed method.