A Simple Approximation for the Response Times in the Two-Class Weighted Fair Queueing System
The weighted fair queueing (WFQ) service discipline provides a flexible way to share bandwidth among two or more traffic classes. Some variants of the basic WFQ principle are used in the practice in computer networks in routers, switches, etc. Unfortunately, the analytical modeling of the related queues turned out to be notoriously difficult. This paper presents approximation expressions for the mean response times in a two-class (ideal) WFQ system with Poisson arrival process and exponentially distributed service times. The approximation is based on simulation. The results are very simple, explicit, yet reasonably accurate, ideal to use in self organizing networks where the weights associated with the different traffic classes need to be recalculated to adapt to the changing network conditions.
Dhari Ali Mahmood would like to thank to the Tempus Public Foundation (TPF) – Stipendium Hungaricum program and University of Technology – Iraq for the support for his PhD scholarship.
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