Hop-count fairness-aware protocols for improved bandwidth utilization in WDM burst-switched networks

Hop-count fairness-aware protocols for improved bandwidth utilization in WDM burst-switched networks In this paper, we propose and evaluate two schemes for improving bandwidth utilization in optical burst-switched (OBS) networks employing timer-based burst assembly routines. The first scheme adjusts the size of the search space for a free wavelength in optical switches using a balancing formula that promotes throughput and hop-count fairness. The formula achieves controllable increase in the size of the search space either when the size of the burst increases or when the hop count of the traveling burst increases. The second scheme proactively discards bursts at the source network access station using a dropping probability matrix that satisfies certain horizontal and vertical constraints. The matrix assigns smaller dropping probabilities to bursts with larger sizes and longer lightpaths. The results of extensive performance tests to evaluate the two schemes and compare them with previous schemes for improving fairness and throughput are presented and discussed. The results show that the two schemes improve the throughput of optical OBS networks and enhance the hop-count fairness. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Photonic Network Communications Springer Journals

Hop-count fairness-aware protocols for improved bandwidth utilization in WDM burst-switched networks

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Publisher
Springer US
Copyright
Copyright © 2012 by Springer Science+Business Media New York
Subject
Computer Science; Computer Communication Networks; Electrical Engineering; Characterization and Evaluation of Materials
ISSN
1387-974X
eISSN
1572-8188
D.O.I.
10.1007/s11107-012-0388-5
Publisher site
See Article on Publisher Site

Abstract

In this paper, we propose and evaluate two schemes for improving bandwidth utilization in optical burst-switched (OBS) networks employing timer-based burst assembly routines. The first scheme adjusts the size of the search space for a free wavelength in optical switches using a balancing formula that promotes throughput and hop-count fairness. The formula achieves controllable increase in the size of the search space either when the size of the burst increases or when the hop count of the traveling burst increases. The second scheme proactively discards bursts at the source network access station using a dropping probability matrix that satisfies certain horizontal and vertical constraints. The matrix assigns smaller dropping probabilities to bursts with larger sizes and longer lightpaths. The results of extensive performance tests to evaluate the two schemes and compare them with previous schemes for improving fairness and throughput are presented and discussed. The results show that the two schemes improve the throughput of optical OBS networks and enhance the hop-count fairness.

Journal

Photonic Network CommunicationsSpringer Journals

Published: Dec 16, 2012

References

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