Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Regular Section -- Papers -- Switching for Communications |
Intermediate-Hop Preemption to Improve Fairness in Optical Burst Switching Networks
1 The author is with Nihon Unisys Solutions, Ltd., Tokyo, 135-8560 Japan., 2 The author is with Nara Institute of Science and Technology, Ikoma-shi, 630-0192 Japan. E-mail: takuji-t{at}is.naist.jp, 3 The author is with Kyoto University, Kyoto-shi, 606-8501 Japan.
In optical burst switching (OBS) networks, burst with different numbers of hops experience unfairness in terms of the burst loss probability. In this paper, we propose a preemptive scheme based on the number of transit hops in OBS networks. In our proposed scheme, preemption is performed with two thresholds; one is for the total number of hops of a burst and the other is for the number of transit hops the burst has passed through. We evaluate the performance of the scheme by simulation, and numerical examples show that the proposed scheme improves the fairness among the bursts with different numbers of hops, keeping the overall burst loss probability the same as that for the conventional OBS transmission without preemption.
Key Words: optical burst switching, preemption, fairness, immediate reservation, burst loss probability, number of hops
Manuscript received February 23, 2007. Manuscript revised July 6, 2007.
Reference
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