On Burst Length Distribution and Preemption Probabilities in OBS Networks with Burst Segmentation |
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Authors: | Eduardo Magaña Javier Aracil |
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Affiliation: | (1) Dept. de Automática y Computación, Universidad Pública de Navarra, 31006 Pamplona, Spain;(2) Dept. de Ingeniería Informática, Universidad Autónoma de Madrid, 28049 Madrid, Spain |
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Abstract: | Recently, preemption techniques have attracted considerable attention as a means to provide differentiated quality of service
in optical burst switching (OBS) networks. This paper is focused on the analysis of preemption probabilities for bursts within
the same priority class. As proposed by Vokkarane and Jue ((2003)* IEEE J Select Areas Commun 21(7): 1198–1209) an incoming
burst will preempt the burst in service, within the same priority class, if the residual length of the burst in service is
smaller than the incoming burst length. For a general case with wavelength conversion, the preemption probability of contending
bursts with a generic service distribution, not necessarily exponential, is analyzed. First, we show that the size distribution
for the preempting bursts is shifted to larger values, in comparison to the original burst size distribution. Second, we obtain
an upper and lower bound for the preemption probability. Finally, the asymptotic behavior of the OBS switch is analyzed showing
that preemption will always occur for a very large number of wavelengths. |
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Keywords: | Burst segmentation Optical burst switching Preemption |
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