Design of a stabilizing AQM controller for large-delay networks based on internal model control

Authors:
Jianxin Wang;Liang Rong;Yunhao Liu
Affiliations:
School of Information Science and Engineering, Central South University, Changsha 410083, China;School of Information Science and Engineering, Central South University, Changsha 410083, China;Department of Computer Science, Hong Kong University of Science and Technology, Hong Kong, China
Venue:
Computer Communications
Year:
2008

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Abstract

We focus on the problem of the stability of congestion control for networks with large round-trip communication delays. Nearly all the existing AQM schemes neglect the impact large communication delay has on system behavior, such as stability, robustness and convergence. The drastic queue oscillations in large delay networks of PI, REM and DC-AQM decrease link utilization and introduce avoidable delay jitter. To address this problem, we propose a robust IMC-PID congestion controller based on the internal model control principle to restrict the negative impact of the stability caused by large delay. Simulation results demonstrate that the integrated performance of our proposed scheme outperforms others as communication delay increases, and achieves high link utilization and small delay jitter.