Greedy Channel Selection Procedure for the Routing, Wavelength Assignment and Spectrum Allocation in the Flexible Optical WDM Networks
AssigneeNEC Laboratories America, Inc.
InventorsAnkitkumar Patel, Philip Nan Ji
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Abstract
The inventive method, implemented in an optical flexible wavelength division multiplexing FWDM network, includes finding a connection route in an optical FWDM network on which a channel with sufficient spectrum is available at lowest wavelength among all available channels, finding K channels at first available K lower wavelengths out of available channels for minimizing total required spectrum; and selecting a channel which is routed through minimum number of optical fiber paths out of the K available channels at one of the lower wavelengths.
Claims7
A method implemented in a communications system including an optical flexible wavelength division multiplexing FWDM network, and method comprising the steps of:
- finding an optimal set of line rates for a requested data rate of each connection in said FWDM using a channel selection for a total spectrum requirement for said set of line rates that is minimal;
- determining available channels with sufficient spectrum for each said connection in a given set of said each connection in a specific order;
- ascertaining K candidate channels on first available K wavelengths for each said connection, all channels having distinct wavelengths with some channels co-existing on a same route connecting end users of said connection, K being number of channels to be considered for each said connection;
- and
- selecting, out of said K candidate channels, a channel routed through a minimum number of physical optical paths, said K channels being found on first available said K wavelengths for confining selection of a channel for a given said connection at lower wavelengths thereby reducing spectrum required for said connection.
A method implemented in an optical flexible wavelength division multiplexing FWDM network, said method comprising the steps of:
- finding a connection route in an optical FWDM network on which a channel with sufficient spectrum is available at lowest wavelength among all available channels;
- finding K channels at first available K lower wavelengths out of available channels for minimizing total required spectrum;
- and
- selecting a channel which is routed through minimum number of optical fiber paths out of said K available channels at one of said lower wavelengths.
Dependencies are inferred from the claim text.