Asymptotic tail distribution of end-to-end delay in networks of queues with self-similar cross traffic

Abstract

We consider the steady state distribution of the end-to-end delay of a tagged flow in queueing networks where the queues have self-similar cross traffic. We assume that such cross traffic at each queue, say queue I, is modeled by fractional Brownian motion (FBM) with Hurst parameter H/sub i/ /spl isin/ (1/2,1), and is independent of other queues. The arrival process of the tagged flow is renewal. Two types of queueing networks are considered. We show that the end-to-end delay of the tagged flow in a tandem queueing network, and more generally in a tree network, is completely dominated by one of the queues. The dominant queue is the one with the maximal Hurst parameter. If several queues have the same maximal Hurst parameter, then we have to compare the ratio (1-/spl rho/)/sup H///spl sigma/ to determine the dominant queue, where /spl rho/ is the load of the queue and /spl sigma/ is the coefficient of variation of the cross traffic at the queue. In the case that the tagged flow is controlled through a window based congestion control mechanism, the end-to-end delay is still asymptotically Weibullian with the same shape parameter. We provide upper and lower bounds on the constant that determines the scale parameter of the corresponding Weibull distribution.

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