Title

New Preemptive Scheduling For Obs Networks Considering Cascaded Wavelength Conversion

Keywords

Fairness; Optical burst switching; Preemption; Wavelength division multiplexing

Abstract

In this paper we introduce a new preemptive scheduling technique for next generation optical burst-switched networks considering the impact of cascaded wavelength conversions. It has been shown that when optical bursts are transmitted all optically from source to destination, each wavelength conversion performed along the lightpath may cause certain signal-to-noise deterioration. If the distortion of the signal quality becomes significant enough, the receiver would not be able to recover the original data. Accordingly, subject to this practical impediment, we improve a recently proposed fair channel scheduling algorithm to deal with the fairness problem and aim at burst loss reduction simultaneously in optical burst switching. In our scheme, the dynamic priority associated with each burst is based on a constraint threshold and the number of already conducted wavelength conversions among other factors for this burst. When contention occurs, a new arriving superior burst may preempt another scheduled one a ccording to their priorities. Extensive simulation results have shown that the proposed scheme further improves fairness and achieves burst loss reduction as well. ©2009 SPIE.

Publication Date

9-9-2009

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

7339

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.820320

Socpus ID

69749095899 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/69749095899

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