Multi-layer LCAS Restoration for Mesh Network Failures
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Solution Overview
Problem
Conventional network restoration methods in high-speed mass networks face inefficiencies due to increased data processing overhead in dynamic restoration, and vulnerability in pre-planned methods to network traffic changes, leading to suboptimal restoration performance and data loss.
Innovation Solution
A multi-layer restoration method that combines hardware and software restoration techniques, utilizing the Link Capacity Adjustment Scheme (LCAS) to automatically adjust link capacities and manage failure paths, prioritizing hardware restoration, followed by pre-planned and dynamic software restoration methods, with the LCAS function ensuring flexible capacity adjustments and minimizing data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic restoration method is used, then real-time restoration based on network status is achieved, but data processing overhead increases causing reduction of restoration performance
Solution Approach 1:
The restoration method is segmented into multiple layers: hardware restoration layer, pre-planned restoration layer, and dynamic restoration layer. Each layer handles specific types of failures, distributing the restoration workload and reducing the processing overhead on any single layer while maintaining overall restoration performance.
2Reliability
If a pre-planned restoration method is used, then restoration performance is improved through predetermined routes, but vulnerability to network traffic changes increases and every network failure cannot be restored
Solution Approach 1:
The system dynamically selects between pre-planned restoration and dynamic restoration methods based on the specific failure scenario and current network status. The LCAS function dynamically adjusts link capacities during restoration, enabling the system to adapt to varying network traffic conditions while maintaining high restoration performance.
Solution Approach 2:
The LCAS (Link Capacity Adjustment Scheme) acts as an intermediary mechanism between the restoration control system and the physical network resources. It enables flexible capacity adjustments and facilitates coordination between different restoration layers, allowing the system to adapt to network traffic changes while maintaining predetermined restoration routes when applicable.
3Speed
If hardware restoration method is performed, then quick repair of optical line disconnection and equipment failure is achieved, but service disconnection occurs when spare channel acquisition fails
Solution Approach 1:
The system performs preliminary actions by pre-configuring restoration routes and pre-establishing spare channel allocations through the LCAS function. When hardware failure occurs, the pre-planned restoration can immediately activate with pre-allocated resources, avoiding service disconnection. The LCAS pre-negotiates capacity adjustments with connected equipment, ensuring spare channels are ready when needed.
Data Source
AI summary
Provided is a multi-layer restoration method using a LCAS (Link Capacity Adjustment Scheme) in a synchronous network having a mesh structure. The method includes: performing a hardware restoration method if a network failure is detected; performing a pre-planned restoration method if the network failure is not repaired by performing the hardware restoration method; determining whether channels that pass along a line where the network failure occurs use the LCAS if the network failure is not repaired by performing the pre-planned restoration method; and applying the LCAS to the channels if the channels are determined to use the LCAS, and performing a dynamic restoration method if the channels are not determined to use the LCAS. The multiplayer restoration method minimizes data loss due to an increase in restoration time and overcomes service disconnection caused by failure to obtain a spare channel.