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Signaling Extensions for Wavelength Switched Optical Networks

This document explores signaling extensions for controlling Wavelength-Switched Optical Networks (WSON), detailing requirements and solutions such as signal characterization, distributed wavelength assignment, and method selection.

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Signaling Extensions for Wavelength Switched Optical Networks

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  1. Signaling Extensions for Wavelength Switched Optical Networks Greg Bernstein Grotto Networking Young Lee Huawei Sugang Xu NICT Hiroaki Harai NICT Daniel King Old Dog Consulting draft-bernstein-ccamp-wson-signaling-02.txt

  2. WSON Work Items • Framework for GMPLS and PCE Control of Wavelength Switched Optical Networks draft-bernstein-ccamp-wavelength-switched-03.txt • Signaling Extensions for Wavelength Switched Optical Networksdraft-bernstein-ccamp-wson-signaling-02.txt • Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-info-03.txt • PCEP Requirements and Extensions for WSON Routing and Wavelength Assignment draft-lee-pce-wson-routing-wavelength-02.txt Relevant to WSON Signal Extensions • Generalized Labels for G.694 Lambda-Switching Capable Label Switching Routersdraft-ietf-ccamp-gmpls-g-694-lambda-labels-02.txt • Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-encode-00.txt

  3. WSON Signaling Extensions Provide extensions to Generalized Multi-Protocol Label Switching (GMPLS) signaling for control of Wavelength Switched Optical Networks (WSON). Changes from 01: Separated requirements section from solution sections. Created detailed appendix on bi-directional requirements with same wavelength. Combined draft Xu since last revision and added three new authors: Sugang Xu, Hiroaki Harai & Daniel King.

  4. WSON Signaling Requirements • Two key requirements identified for WSON signaling: • WSON Signal Characterization Ability to determine path compatibility and request specific optical parameters and resources. • Bi-Directional Distributed Wavelength Assignment Permit simultaneous bi-directional wavelength assignment. • Optional feature to be decided upon: • Distributed Wavelength Assignment Method SelectionSelection of optimal wavelength assignment algorithm.

  5. Requirement 1 • Problem: WSON Signal CharacterizationWSON signaling would convey the necessary information to allow systems along the path to determine path compatibility and perform any required nodal configuration. • Solution: Lightpath characteristics are defined as traffic parameters. Defines a signal type field that consists of modulation format/rate information. Similar to method used for SONET/SDH signals (RFC4606) and G.709 signals (RFC4328).

  6. Requirement 2 • Problem:Bi-Directional Distributed Wavelength Assignment To reduce setup and recovery times there needs to be support for distributed wavelength assignment consistent with the wavelength continuity constraint for bi-directional connections. Current GMPLS approach to bi-directional signaling does not work with distributed wavelength assignment. • Solution: Incorporation of Draft Xu Defines a mechanism for same wavelength bidirectional lightpath. Reduces setup times and lowers blocking probability.

  7. Bidirectional Blocking Probabilities • Simulations of a Pan-European network with 27 nodes, 55 WDM links with 32 channels per link • “Label Set” method is that proposed in the draft, “Upstream label” selects “best guess” bi-directional wavelength (label) based on aggregate information (label set mechanisms cannot be used). • See: N. Andriolli, A. Giorgetti, S. Ruepp, J. Buron, L.Valcarenghi, P. Castoldi, "Bidirectional Lightpath Provisioning in GMPLS-Controlled Optical Networks", To Appear International Conference on Photonics in Switching, August 2008.

  8. Optional Feature • Problem:Distributed Wavelength Assignment Method Selection A variety wavelength assignment algorithms are available. These are discussed in the WSON Framework draft. • Solution: Wavelength Assignment Method Selection Wavelength assignment can be either for a unidirectional lightpath or for a bidirectional lightpath constrained to use the same lambda in both directions. A TLV could be used to indication wavelength assignment directionality and wavelength assignment method.

  9. Next Steps • Additional Work: • Decide on keeping RWA selection feature. • Need to document bidirectional lightpath using different wavelengths on different directions. • Work to finalize signal characterization. • Look for other requirements, further review and feedback. • Advance implementations. • Adopt as a WG ID.

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