PCEP Extension for Flexi-Grid Spectrum Allocation
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Solution Overview
Problem
Current Path Computation Element Protocol (PCEP) does not support dynamic bandwidth allocation in flexi-grid optical networks, limiting its ability to utilize the variable frequency size features of these networks.
Innovation Solution
Extension of PCEP with new type-length-value (TLV) elements and objects that allow for requesting and allocating variable amounts of spectrum, including a spectrum assignment object that specifies a label for spectrum restriction, channel spacing, and methods for spectrum assignment, enabling dynamic spectrum allocation on flexi-grid networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PCEP uses fixed bandwidth allocation, then protocol simplicity is maintained, but adaptability to flexi-grid networks is lost
Solution Approach 1:
The bandwidth allocation mechanism is segmented into fixed-grid mode and flexi-grid mode, allowing the protocol to selectively enable flexi-grid features only when needed. This is achieved through optional TLV elements that can be included or excluded based on network requirements, maintaining backward compatibility while enabling adaptability to flexi-grid networks.
Solution Approach 2:
The protocol introduces dynamic bandwidth allocation capabilities through spectrum assignment objects that allow the bandwidth to be adjusted based on network conditions and requirements. The flexi-grid mode enables dynamic modification of bandwidth parameters without requiring changes to the core protocol structure, thus improving adaptability while controlling complexity growth.
2Adaptability or versatility
If PCEP is extended with new TLV elements for flexi-grid support, then functionality is improved, but protocol complexity increases
Solution Approach 1:
The flexi-grid specific functionality is extracted into separate optional TLV elements and objects that can be independently added to the protocol. This includes spectrum assignment objects, bandwidth modification parameters, and grid type indicators. These extracted elements can be processed only when present in the message, allowing the core protocol to remain simple while supporting enhanced functionality when needed.
3Productivity
If dynamic spectrum allocation is implemented, then resource utilization efficiency is improved, but processing complexity increases
Solution Approach 1:
The protocol enables self-service spectrum allocation through automated path computation elements that can independently determine and allocate spectrum resources based on network state and requirements. The PCE computes optimal spectrum assignments using the extended protocol elements, eliminating the need for manual configuration and reducing operational complexity while improving allocation efficiency.
Data Source
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AI summary
A computer-implemented method of requesting a path on a flexi-grid network comprises: sending, by a path computation client (PCC), a request for a path to a path computation element (PCE), the request including the request including: a label that identifies spectrum to be restricted from use in the path; and a channel spacing field; and receiving, by the PCC and from the PCE, a response to the request, the response including an identifier of an assigned path on the flexi-grid network.