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Consistent proportional delay differentiation: a fuzzy control approach

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2 Author(s)
Wei, J. ; Dept. of Electr. & Comput. Eng., Wayne State Univ., Detroit, MI, USA ; Cheng-Zhong Xu

Proportional delay differentiation (PDD) aims to maintain pre-specified packet queueing-delay ratios between different classes of traffic at each hop. Existing bandwidth-allocation approaches for PDD services rely on the assumption that average queueing delay of a class is inversely proportional to its allocated bandwidth, which is valid only in a heavy-utilized link. Consequently, in a non-heavy utilized link, they are unable to provide consistent PDD services effectively. As a remedy, in this paper, we propose a novel bandwidth-allocation approach that applies fuzzy control theory to reflect the nonlinearity between the queueing delay and the allocated bandwidth. In the approach, the bandwidth of a class is adjusted according to a set of fuzzy control rules defined over its error, the change of error, and the change of bandwidth allocation. Simulation results demonstrate that, in comparison with other bandwidth-allocation approaches, the fuzzy control approach is able to provide consistent PDD services under light, moderate, and heavy utilization conditions. They also show its robustness under various operation environments.

Published in:

Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE  (Volume:1 )

Date of Conference:

28 Nov.-2 Dec. 2005