Offset Time Management For Fairness Improvement And Blocking Probability Reduction In Optical Burst Switched Networks

Abstract — This paper pays a great attention to the process of calculating the burst offset time in Wavelength Division Multiplexed (WDM) Optical Burst Switching (OBS) networks. The blocking probability of the burst in the case of using variable offset time is studied through theoretical analysis. The analysis is based on the first-passage-time distributions. In order to perform offset time management, two algorithms have been used to determine the optimum offset values in order to guarantee an objective blocking probability value. Of course, the optimum offset values obtained greatly solve the fairness problem. As a result, for all ingress-egress node pairs in an OBS network, bursts with different hop lengths have equal likelihood to get through. The results for three cases are presented