Optical Path Validation for Fault Resilient Networks
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Solution Overview
Problem
Current optical networks struggle with fault recovery for externally originating optical channels, as they cannot re-route traffic channels when a fault occurs on the new optical channel path within the wavelength switching optical network.
Innovation Solution
A method is introduced in a border node of an optical network to receive optical channel traffic parameters, determine the suitability of optical paths, and send availability messages to the optical channel originator, enabling the detection of faults and re-routing of client traffic to a second border node on a second optical channel, while validating alternative paths to ensure quality of transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IP router re-routes the traffic channel to a second border node for fault recovery, then fault resiliency is provided for a single fault, but the system becomes unable to handle faults on the new optical channel path
Solution Approach 1:
The patent applies preliminary action by pre-calculating and validating multiple alternative optical paths before faults occur. The border node determines suitability of at least one optical path using optical channel traffic parameters and updates channel status records in advance, so when a fault occurs, the system can immediately switch to a pre-validated alternative path without needing to perform new path validation during fault recovery.
2Measurement precision
If the system validates optical paths using optical channel traffic parameters, then path suitability is determined accurately, but additional processing steps are required
Solution Approach 1:
The border node performs optical path validation using optical channel traffic parameters before the optical channel is actually established. By determining path suitability in advance and updating channel status records preliminarily, the system avoids the need to perform complex validation processing during actual fault recovery operations, thus reducing real-time processing complexity while maintaining high accuracy.
3Productivity
If the border node determines suitability of optical paths using received optical channel traffic parameters, then optimal paths are selected, but the system requires additional information exchange with external optical channel originators
Solution Approach 1:
The patent extracts only the essential optical channel traffic parameters needed for path validation from the external optical channel originator, rather than exchanging complete channel information. The border node uses these extracted parameters to determine path suitability and updates channel status records, minimizing information exchange overhead while maintaining the ability to make optimal path selection decisions.
Data Source
AI summary
A border node of an optical network receives optical channel traffic parameter(s) associated with an optical channel from an optical channel originator external to the optical network. The received parameters are used to determine the suitability of at least one optical path within the optical network for an externally originating optical channel. If a suitable optical path is determined, an optical channel availability message indicating the availability at the border node of an optical path within the optical network for the optical channel is sent to the optical channel originator. The optical channel originator determines an available optical channel status of the optical channel from the received optical channel availability message for the optical channel.