Optical Network Controller for Elastic Optical Path Re-optimization
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Solution Overview
Problem
In elastic optical networks, the process of re-optimizing client signals to be concentrated becomes increasingly complex due to the need to reallocate demand traffic across multiple wavelength slots, leading to inefficiencies in optical path accommodation.
Innovation Solution
An optical network controller that includes reallocation detection, design-candidate exclusion, optical path design, traffic reference, and line concentration design means to determine alternative routes and allocate wavelength slots efficiently, excluding paths with increasing occupied slots to improve traffic concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic optical network scheme is used to flexibly allocate frequency bands, then adaptability of optical path allocation is improved, but device complexity increases due to need to determine number of wavelength slots based on transmission capacity
Solution Approach 1:
The patent changes the parameter of wavelength slot allocation from flexible elastic allocation to fixed slot allocation. By determining the number of wavelength slots in advance based on transmission capacity requirements and maintaining this fixed allocation throughout the re-optimization process, the system achieves simpler processing while still accommodating different traffic demands through route optimization rather than slot reallocation.
Solution Approach 2:
The patent extracts the wavelength slot determination step from the re-optimization process. By pre-determining the number of wavelength slots based on transmission capacity before the re-optimization begins, and excluding this determination from the actual re-optimization calculations, the complexity of the re-optimization process is reduced while maintaining adaptability through the fixed slot allocation framework.
2Adaptability or versatility
If re-optimization process includes determining number of wavelength slots, then adaptability is improved, but processing time increases
Solution Approach 1:
The patent performs the wavelength slot determination action in advance, before the re-optimization process begins. By calculating and fixing the number of wavelength slots based on transmission capacity requirements beforehand, this step is removed from the time-consuming re-optimization calculations, thereby reducing processing time while maintaining adaptability through the pre-established fixed allocation framework.
3Device complexity
If fixed number of wavelength slots is allocated, then processing complexity is reduced, but optical path accommodation efficiency decreases
Solution Approach 1:
The patent introduces dynamics into the system by allowing the selection of different fixed allocation patterns and multiple alternative routes. While the number of wavelength slots per path is fixed, the system can dynamically choose among different routing options and allocation patterns to optimize accommodation efficiency, achieving a balance between simplified processing and improved productivity.
Data Source
AI summary
In the elastic optical network, there has been the problem that processing steps increase that are required to re-optimize client signals to be concentrated; therefore, an optical network controller according to an exemplary aspect of the present invention includes reallocation detection means for monitoring an operation status of at least one of an optical communication channel and an optical node device that constitute an optical network, and determining, based on the operation status, whether or not to reallocate a client signal accommodated in an optical path set in the optical network; design-candidate exclusion means for designating, as a design exclusion object, at least one of the optical communication channel and the optical node device that are associated with an optical path targeted for reallocation that accommodates the client signal that the reallocation detection means has determined to reallocate; optical path design means for determining an alternative route for the optical path targeted for reallocation from among routes with the exception of the design exclusion object; traffic reference means for determining the client signal to be reaccommodated in an optical path on the alternative route, referring to demand traffic accommodated in the optical path targeted for reallocation; and line concentration design means for constituting line-concentration traffic in which traffic having been allocated to the alternative route and the demand traffic are concentrated, wherein the traffic reference means determines a reallocation optical path in which an optical path candidate with number of occupied wavelength slots increasing is excluded from optical path candidates on the alternative route, and the optical path design means determines wavelength allocation of the reallocation optical path so as to accommodate the line-concentration traffic.