The influence of burst length in optical burst switching system with completely isolated classes

Abstract

In optical burst switching (OBS) networks, class differentiation is achieved by assigning an adequately long offset time between a burst control packet (BCP) and a data burst (DB). Blocking probability is one of the main performance measures in OBS networks. Though the effects of length distribution of low-class burst and the ratio of arrival rates of low-class and high-class on high-class blocking probability have been studied, there has been no examination of the effects of the length of low-class on burst blocking probability. In this paper, we analyze loss performance of OBS network by examining the burst size of low-class bursts. When we vary the burst size of low-class burst from large to small, the evaluation results show that while the high-class blocking probability remains same, the low-class blocking probability decreases significantly. These results imply that it is important for OBS network designers to take into account the burst size of low-class to improve system performance in OBS networks