Optical Path Controller for Elastic Network Frequency Utilization
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Solution Overview
Problem
In elastic optical networks, achieving a balance between improving frequency utilization efficiency and increasing the probability of opening optical paths is challenging due to fragmentation of optical frequency bands, which reduces the success probability of optical path opening.
Innovation Solution
An optical path controller that selects routes based on a minimum route selection index, considering the use rate of optical frequency bands, to prioritize either transmission characteristics or use rate conditions, ensuring efficient frequency utilization and path opening success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of allocated wavelength slots is changed depending on demand traffic capacity and transmission characteristics, then frequency utilization efficiency is improved, but fragmentation of optical frequency bands occurs which reduces optical path opening success probability
Solution Approach 1:
The patent implements a feedback mechanism by collecting use rate information of optical frequency bands and dynamically adjusting route selection based on this feedback. The controller monitors the state of optical frequency bands and modifies routing decisions to avoid fragmented regions, thereby maintaining high frequency utilization efficiency while preventing further fragmentation that would reduce path opening success probability.
Solution Approach 2:
The system dynamically adjusts route selection metrics based on real-time use rate conditions of optical frequency bands. Instead of using fixed routing criteria, the controller adapts its route selection strategy according to the current state of frequency band utilization, allowing it to optimize frequency usage while avoiding areas prone to fragmentation.
2Productivity
If route selection is optimized for transmission characteristics, then frequency utilization efficiency is maximized, but the probability of opening optical paths decreases due to fragmentation
Solution Approach 1:
The patent changes the routing parameters dynamically by introducing use rate information as a new parameter in route selection. The controller adjusts which parameters are prioritized based on current frequency band conditions, switching between optimizing for transmission characteristics and avoiding fragmented regions depending on the situation.
Solution Approach 2:
The system performs preliminary analysis of use rate conditions for different routes before making final routing decisions. By collecting and analyzing use rate information in advance, the controller can identify potential fragmentation issues and select routes that will maintain both frequency utilization efficiency and path opening probability.
Data Source
AI summary
It is difficult in the elastic optical network to achieve a balance between the improvement in the frequency utilization efficiency and the increase in the probability of opening an optical path; therefore, an optical path controller according to an exemplary aspect of the present invention includes route selection means for searching for a route candidate being a candidate for a route to accommodate an optical path, and selecting a best possible route with a minimum route selection index serving as an index for route search; use rate collecting means for collecting a use rate serving as an index to indicate a usage condition of an optical frequency band in an optical fiber transmission line included in the route candidate; and route selection index judgment means for determining the route selection index based on the use rate.