ODUk Protection Switching in Ring Optical Networks
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Solution Overview
Problem
Channel shared protection in Optical Transport Networks (OTNs) fails when multiple ODUk alarms occur simultaneously, leading to service misconnection and inability to protect multiple services simultaneously, due to resource conflicts and decreased stability with increasing nodes.
Innovation Solution
A method and device that detect alarms in real-time, triggering a 1+1 protection protocol for single ODUk alarms and switching to channel shared protection when additional alarms occur, utilizing ODUk crossover capabilities to manage multiple alarms without increasing link resources, ensuring robust protection by separating protection resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If channel shared protection is used in ring network, then bandwidth utilization ratio is improved, but stability deteriorates when nodes increase and multiple alarms occur
Solution Approach 1:
The patent segments the protection mechanism into two distinct protocols: 1+1 protection protocol for single alarm scenarios and channel shared protection protocol for multiple alarm scenarios. This segmentation allows each protocol to operate in its optimal performance range, avoiding the instability of channel shared protection when handling single alarms while maintaining high bandwidth utilization through channel shared protection when multiple alarms occur.
Solution Approach 2:
The patent implements dynamic protocol selection based on the number of detected alarms. The system transitions from 1+1 protection mode to channel shared protection mode when multiple alarms are detected, and vice versa. This dynamic adaptation resolves the contradiction by adjusting the protection mechanism according to actual network conditions, ensuring both high bandwidth utilization and stable protection performance.
2Quantity of substance
If channel shared protection is used, then bandwidth utilization is improved, but protection capability deteriorates when multiple ODUk alarms occur simultaneously
Solution Approach 1:
The patent divides the protection capability into two specialized modes: 1+1 protection for single service protection and channel shared protection for multiple service protection. When multiple ODUk alarms occur simultaneously, the system activates channel shared protection which is specifically designed to handle multiple services, thereby maintaining high protection capability while preserving bandwidth utilization benefits.
Solution Approach 2:
The patent changes the operational parameters of the protection system based on alarm conditions. When multiple alarms are detected, the system switches to channel shared protection mode which has different resource allocation parameters optimized for protecting multiple services simultaneously, thus maintaining both bandwidth utilization and protection capability under varying conditions.
3Reliability
If 1+1 protection is used, then protection robustness and switching time are improved, but bandwidth utilization ratio deteriorates
Solution Approach 1:
The patent dynamically adjusts the protection mode based on the number of active alarms. 1+1 protection is activated only when a single alarm is detected, providing maximum protection robustness and fastest switching time for single-service scenarios. When multiple alarms occur, the system switches to channel shared protection, thereby optimizing bandwidth utilization. This dynamic selection resolves the contradiction by applying 1+1 protection only when its advantages are most needed.
Solution Approach 2:
The patent changes the resource allocation parameters based on alarm conditions. In single-alarm scenarios, the system uses 1+1 protection parameters that prioritize protection robustness and switching speed. In multiple-alarm scenarios, it switches to channel shared protection parameters that optimize bandwidth utilization, thus resolving the contradiction through parameter adaptation to actual network conditions.
Data Source
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AI summary
The present invention discloses a method and device for processing an alarm in a ring optical transport network. The method comprises detecting alarm information in the ring network in real-time, and when generation of only an working ODUk alarm in the ring network is detected, performing a switching process of a 1+1 protection protocol on services carried on a working channel on which an alarm is generated; in the event that one working ODUk alarm has existed in the ring network, when generation of an alarm at a protection ODUk corresponding to the working ODUk on which the alarm has been generated is also detected, or when an optical multiplexed segment layer alarm is generated in the ring network, triggering a switching process of a channel shared protection protocol. The device comprises an alarm detection module and a switching triggering module. The present invention can perform the 1+1 protection for multiple ODUk services simultaneously, and provide the link separated channel shared protection in the case of protection resource failure, thereby greatly increasing the robustness of protection in the ring network topology.