Traffic scheduling in hybrid WDM–TDM PON with wavelength-reuse ONUs

Traffic scheduling in hybrid WDM–TDM PON with wavelength-reuse ONUs Hybrid WDM–TDM PON (wavelength division multiplexing–time division multiplexing passive optical network) that applies wavelength-independent or colorless ONU (optical network unit) technologies will further reduce implementation and maintenance expenses. The “wavelength-reuse” colorless ONU technology imposes a physical constraint in the hybrid WDM–TDM PON that the same wavelength is used for both upstream and downstream traffic transmission of an ONU. This physical constraint brings a new challenge to developing traffic scheduling algorithms in the network, as upstream traffic scheduling is no longer independent of downstream traffic scheduling and the existing traffic scheduling algorithms that treated the upstream and downstream traffic independently cannot be applied in this case. We propose a new traffic scheduling algorithm that takes both directions’ traffic scheduling into account at the same time. A logical PON concept is defined, and wavelength resource sharing is performed based on reconfiguring logical PONs. Simulation study on this algorithm is conducted, and results show that it achieves efficient wavelength and bandwidth resource sharing in the network. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Photonic Network Communications Springer Journals

Traffic scheduling in hybrid WDM–TDM PON with wavelength-reuse ONUs

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Publisher
Springer US
Copyright
Copyright © 2012 by Springer Science+Business Media, LLC
Subject
Computer Science; Computer Communication Networks; Characterization and Evaluation of Materials; Electrical Engineering
ISSN
1387-974X
eISSN
1572-8188
D.O.I.
10.1007/s11107-012-0375-x
Publisher site
See Article on Publisher Site

Abstract

Hybrid WDM–TDM PON (wavelength division multiplexing–time division multiplexing passive optical network) that applies wavelength-independent or colorless ONU (optical network unit) technologies will further reduce implementation and maintenance expenses. The “wavelength-reuse” colorless ONU technology imposes a physical constraint in the hybrid WDM–TDM PON that the same wavelength is used for both upstream and downstream traffic transmission of an ONU. This physical constraint brings a new challenge to developing traffic scheduling algorithms in the network, as upstream traffic scheduling is no longer independent of downstream traffic scheduling and the existing traffic scheduling algorithms that treated the upstream and downstream traffic independently cannot be applied in this case. We propose a new traffic scheduling algorithm that takes both directions’ traffic scheduling into account at the same time. A logical PON concept is defined, and wavelength resource sharing is performed based on reconfiguring logical PONs. Simulation study on this algorithm is conducted, and results show that it achieves efficient wavelength and bandwidth resource sharing in the network.

Journal

Photonic Network CommunicationsSpringer Journals

Published: Apr 4, 2012

References

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