GMPLS Link State Advertisement for Flexible Grid Spectral Allocation
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Solution Overview
Problem
Current optical networks face underutilization due to ineffective advertisement of unreserved bandwidth, particularly in flexible grid systems, which hampers the efficient allocation of optical spectral bandwidth for high data rate applications.
Innovation Solution
A link state advertisement message conforming to the GMPLS routing protocol is generated and transmitted between nodes, including information on available spectral portions and slice spacing, enabling the establishment of label switched paths using unreserved spectral slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional fixed grid wavelength allocation is used, then network compatibility and standardization are maintained, but spectral bandwidth utilization efficiency deteriorates
Solution Approach 1:
The optical spectrum is divided into multiple frequency slots, each further divided into spectral slices. This segmentation allows flexible allocation of spectral resources while maintaining manageable network complexity through structured organization of spectrum resources.
Solution Approach 2:
The patent implements dynamic spectral allocation where frequency slots and spectral slices can be flexibly assigned and reconfigured based on network demands. This dynamic approach improves spectral utilization while the underlying grid structure maintains network compatibility.
2Productivity
If spectral slice information is not advertised, then message simplicity is maintained, but bandwidth allocation efficiency deteriorates
Solution Approach 1:
Spectral slice availability information is advertised in advance through link state advertisement messages before bandwidth allocation is needed. This preliminary information dissemination enables efficient bandwidth allocation decisions while the information is cached and reused, minimizing repeated transmission overhead.
3Measurement precision
If detailed spectral portion information is included in advertisements, then routing precision is improved, but message complexity deteriorates
Solution Approach 1:
Spectral information is segmented into structured elements including frequency slot identifiers, spectral slice ranges, and availability indicators. This segmentation provides precise spectral allocation information while maintaining manageable message complexity through organized data representation.
Solution Approach 2:
The patent advertises spectral information at the appropriate level of detail for each link state advertisement, providing precise spectral portion information only where needed for routing decisions rather than universally across all messages, thus balancing precision with complexity.
Data Source
AI summary
A method and system are disclosed in which a link state advertisement message (LSA) conforming to a Generalized Multiprotocol Label Switching (GMPLS) routing protocol is generated and transmitted. The LSA is associated with a TE Link between a transmit node and a receive node in a network. The transmit node supplies a plurality of optical signals, each of which has a plurality of frequencies, the frequencies being allocated among a plurality of spectral portions such that the plurality of spectral portions are grouped into a plurality of frequency slots. The LSA may include information indicative of a number of spectral portions, e.g., spectral slices, which correspond to frequencies of selected ones of the plurality of optical signals, said selected ones of the plurality of optical signals being available to carry data from the transmit node to the receive node.