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Congestion Control and Contention Elimination in Optical Burst Switching

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Abstract

Optical burst switching (OBS) is a proposed new communications technology that seeks to expand the use of optical technology in switching systems. However, many challenging issues have to be solved in order to pave the way for an effective implementation of OBS. Contention, which may occur when two or more bursts compete for the same wavelength on the same link, is a critical issue. Many contention resolution methods have been proposed in the literature but many of them are very vulnerable to network load and may suffer severe loss in case of heavy traffic. Basically, this problem is due to the lack of information at the nodes and the absence of global coordination between the edge routers. In this work, we propose another approach to avoid contention and decrease the loss. In this scheme, the intermediate nodes report the loss observed to the edge nodes so that they can adjust the traffic at the sources to meet an optimal network load. Furthermore, we propose a combination of contention reduction through congestion control and bursts retransmission to eliminate completely bursts loss. This new approach achieves fairness among all the edge nodes and enhances the robustness of the network. We also show through simulation that the proposed protocol is a viable solution for effectively reducing the conflict and increasing the bandwidth utilization for optical burst switching.

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Authors and Affiliations

  1. School of Information Technology & Engineering, 800 King Edward Ave, Room 5105, P.O. Box, 450, Stn. A, Ottawa, ON, K1N 6N5, Canada

    Abdelilah Maach, Gregor V. Bochman & Hussein Mouftah

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  1. Abdelilah Maach
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  2. Gregor V. Bochman
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  3. Hussein Mouftah
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Maach, A., Bochman, G.V. & Mouftah, H. Congestion Control and Contention Elimination in Optical Burst Switching. Telecommunication Systems 27, 115–131 (2004). https://doi.org/10.1023/B:TELS.0000041005.87009.e5

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  • DOI: https://doi.org/10.1023/B:TELS.0000041005.87009.e5

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