Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). We
investigate the effect of nonnegligible header length (HL) in optical burst
switching on blocking probability. The HL is the total delay of a control packet at
the controller. We first develop a model that explicitly presents the distribution
of offset times as a function of the HL. Next we argue that the variance of this
distribution (and not the mean) affects the blocking probability. In particular, the
total blocking probability of a burst is dominated by the blocking on its last link,
where its offset is shortest. We derive a lower bound for a HL threshold value below
which blocking is not sensitive to the reservation algorithm. This threshold depends
on network connectivity, number of channels per fiber, and burst length. The
blocking probabilities of both the just enough time and the horizon reservation
algorithms were empirically found not to be very sensitive to the distribution of
burst sizes.
© 2004 Optical Society of America
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