Title :
An accurate model for evaluating blocking probabilities in multi-class OBS systems
Author :
Barakat, N. ; Sargent, E.H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada
Abstract :
This letter presents an analytical model that can be used to evaluate the blocking probability of each service class in a multi-class optical burst-switching network. The model allows, for the first time, the evaluation of blocking probabilities in optical burst switching (OBS) systems with arbitrary burst-length distributions and arbitrary offsets. This includes OBS systems in which the mean burst length of each class is different. Such systems do not follow the conservation law and cannot, therefore, be analyzed using previously published OBS models. For an OBS system with two classes, an offered load of 10-3, and a 1:5 ratio of high-priority to low-priority traffic, we show that our model accurately predicts the blocking probability for each class, whereas predictions from previously published models that assume conservation disagree with the simulation results by as much as 75%.
Keywords :
conservation laws; optical fibre networks; probability; telecommunication switching; telecommunication traffic; analytical model; arbitrary burst-length distributions; arbitrary offsets; blocking probability; bursty traffic; conservation law; multiclass optical burst-switching network; optical networks; Analytical models; Burst switching; Delay; Intelligent networks; Optical buffering; Optical burst switching; Optical fiber networks; Predictive models; Telecommunication traffic; Traffic control;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2004.823392