Abstract
One of the key problems hindering the realization of optical burst
switching (OBS) technology in the core networks is the losses due to
contention among the bursts at the core nodes. Such contention losses do not
necessarily indicate a situation of congestion. Burst segmentation is an
effective contention resolution technique used to reduce the number of
packets lost due to the burst losses. In this work, we propose a method of
analyzing the benefit of burst segmentation considering the effect of
correlation in traffic across multiple paths. Starting with the cumulative
distribution function (cdf) of the length of the bursts at the ingress node
destined to a particular egress node, we evaluate the cdf of the burst
length at each node along the path considering the probability of
segmentation and the traffic on the adjoining paths. Comparing the burst
length at the egress node with that at the ingress node, we evaluate the
byte loss probability (ByLP) along the path and also the network-wide
average ByLP. The proposed analytical framework studies the impact of
segmentation on packet loss rate considering the effect of the length of a
path, the number of paths adjoining a path (extent of path correlation), the
effect of load on a path and other correlated paths, and the burst assembly
algorithm. Analytical and simulation results in this work show that the
proposed method of analysis gives a good understanding of the influence of
aforementioned factors on the benefit of segmentation in OBS
networks.
© 2009 IEEE
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