Path Computation Element System and Method of Routing and Wavelength Assignment in a Wavelength Switched Optical Network
First Claim
1. An apparatus comprising:
- a path computation element (PCE) that computes routes for a lightpath in an optical network and comprises a receiver that receives a path computation request;
a logic unit that calculates a plurality of possible wavelengths that can be used along a lightpath; and
a transmitter that transmits the plurality of possible wavelengths to a network element (NE) along the lightpath,wherein the NE assigns a wavelength to the lightpath from the plurality of possible wavelengths.
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Abstract
The disclosure includes an apparatus comprising a path computation element (PCE) that manages the processes of routing in an optical network, wherein the PCE receives a path computation request and provides a wavelength range to a network element (NE), and wherein the NE assigns a wavelength from the wavelength range. Also disclosed is an apparatus comprising a path computation client (PCC) that sends a path computation request to a path computation client (PCE) using path computation element communication protocol (PCEP), and receives a routing and wavelength assignment (RWA) reply to the path computation request using PCEP, wherein the RWA reply comprises an PCEP error message comprising a PCEP error object and an error value to indicate errors associated with the RWA request.
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Citations
23 Claims
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1. An apparatus comprising:
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a path computation element (PCE) that computes routes for a lightpath in an optical network and comprises a receiver that receives a path computation request;
a logic unit that calculates a plurality of possible wavelengths that can be used along a lightpath; and
a transmitter that transmits the plurality of possible wavelengths to a network element (NE) along the lightpath,wherein the NE assigns a wavelength to the lightpath from the plurality of possible wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a path computation client (PCC) comprising a transmitter that sends a path computation request to a path computation element (PCE) using path computation element communication protocol (PCEP); and
a receiver that receives a reply to the path computation request using PCEP;wherein the path computation request comprises a request for routing and wavelength assignment (RWA) by distributed label allocation, and wherein the reply indicates that an error occurred, that no path satisfying the constraints was found, or both. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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providing, by a path computation element (PCE), a label set containing one or more allocated labels; and performing, during signaling, distributed label allocation to complete wavelength assignment (WA). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification