Dynamic Watermark WDM Network Reorganization
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Solution Overview
Problem
Existing wavelength division multiplexing (WDM) network reorganization techniques struggle to adapt effectively to varying traffic patterns due to assumptions of known future traffic patterns, nonlinear target functions, and limitations in wavelength and port availability, leading to inefficient virtual topology optimization and frequent reorganization needs.
Innovation Solution
A method using dynamic watermarks to determine the addition or elimination of optical paths, with watermarks dynamically adjusted based on maximum and minimum optical path loads, allowing for real-time reorganization of virtual topology to balance network resources and adapt to changing traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed watermarks are used for network reorganization, then the reorganization threshold is simple to determine, but the system cannot adapt to varying traffic patterns effectively
Solution Approach 1:
The patent applies dynamics by transitioning from fixed watermarks to dynamic watermarks that automatically adjust based on observed traffic patterns. The watermark values are no longer static thresholds but evolve over time through continuous monitoring of optical path loads, enabling the system to adapt to varying traffic conditions without manual intervention.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors the load on optical paths and uses this information to adjust watermark values. The feedback loop compares actual traffic patterns against expected patterns and modifies watermarks accordingly, allowing the system to learn from past behavior and improve its adaptability to future traffic variations.
2Productivity
If frequent network reorganization is performed to optimize virtual topology, then network performance improves, but network stability deteriorates due to constant changes
Solution Approach 1:
The patent applies periodic action by implementing time-based thresholds that control when reorganization occurs. Instead of triggering reorganization whenever any metric changes, the system uses periodic evaluation cycles with minimum time intervals between reorganizations. This periodic mechanism allows the network to stabilize between optimization cycles, preventing constant fluctuations while still achieving regular performance improvements.
Solution Approach 2:
The patent changes parameters by introducing dynamic watermark values that adjust based on traffic patterns, rather than using fixed thresholds. By modifying the threshold parameters themselves based on observed conditions, the system can be more aggressive during low-traffic periods and more conservative during high-traffic periods, optimizing performance without causing excessive instability.
3Stability of the object's composition
If conservative reorganization strategy is used to maintain stability, then network stability is maintained, but the ability to respond to traffic changes is reduced
Solution Approach 1:
The patent resolves this contradiction by making the reorganization strategy dynamic rather than static. The system adjusts its aggressiveness based on current conditions: during periods of stable traffic, it maintains conservatism for stability; during periods of significant traffic pattern changes, it becomes more aggressive to adapt quickly. This dynamic adjustment allows the system to exhibit both stability and responsiveness as needed.
Solution Approach 2:
The feedback mechanism enables the system to detect when traffic patterns are changing significantly and trigger reorganization accordingly. By continuously monitoring traffic metrics and comparing them against dynamic watermarks, the system can respond to actual conditions rather than following a fixed conservative schedule, thus maintaining both stability and adaptability.
4Adaptability or versatility
If dynamic watermarks are implemented to adapt to traffic variation, then adaptability improves, but computational complexity increases
Solution Approach 1:
The patent applies partial action by implementing dynamic watermarks only for the most critical or variable parameters rather than dynamically adjusting all possible thresholds. This selective approach provides sufficient adaptability for the most important traffic variations while avoiding the computational overhead of dynamically managing every parameter, thus balancing adaptability with complexity.
Data Source
AI summary
Disclosed is a method of reorganizing a wavelength division multiplexing network using dynamic watermarks and a computer readable recoding medium for storing a program for executing the same method. The reorganization method of organizing a wavelength division multiplexing (WDM) network using a dynamic watermark of the invention includes the steps a) collecting load information for optical paths of the WDM network from nodes on the optical paths; b) detecting optical paths having maximum load and minimum load from the collected load information and computing a maximum value and a minimum value based on the collected load information; and c) resetting an upper watermark and a lower watermark based on the maximum value and the minimum value.