SDN L0 Controller Parallel Optical Path Restoration
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Solution Overview
Problem
Current optical transport networks face inefficiencies in optical layer recovery due to serial activation processes of nodes in restore paths, which are time-consuming and lack protocols for supporting protection functions in optical layers.
Innovation Solution
A SDN L0 network controller that receives real-time performance information from optical nodes and implements recovery mechanisms in a parallel manner to activate restore paths, reducing the time required for network restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If serial activation process is used for nodes in restore paths, then control simplicity is maintained, but restoration time increases
Solution Approach 1:
The patent segments the restoration control process by introducing an external controller that manages multiple network-to-network interfaces (NNIs) independently. Each NNI can be activated in parallel under the coordination of the external controller, thereby reducing overall restoration time while maintaining centralized control logic.
Solution Approach 2:
The patent implements preliminary configuration of protection paths and node states before failures occur. By pre-establishing restoration capabilities and node readiness states, the system enables faster parallel activation when failures happen, reducing the actual restoration time without proportionally increasing control complexity.
2Productivity
If parallel activation of nodes is implemented, then restoration speed improves, but control complexity increases
Solution Approach 1:
The patent introduces an external controller as an intermediary between the control system and multiple NNIs. This mediator coordinates parallel activation of nodes by managing the complexity of simultaneous operations, allowing restoration speed to improve while the control complexity is encapsulated and managed by the intermediary controller.
3Reliability
If optical layer protection protocols are added, then network reliability improves, but system complexity increases
Solution Approach 1:
The patent segments protection protocols into separate network-to-network interface (NNI) level protocols and control plane protocols. By localizing protection functions at the NNI level with standardized interfaces, the system achieves optical layer protection reliability while preventing protocol complexity from propagating throughout the entire system.
Data Source
AI summary
Methods, systems, and optical power controllers are disclosed. Various problems caused by the use of a single L0 power controller in the prior art are addressed by using first and second L0 power controllers with the first L0 power controller managing first optical components with the optical network, and the second L0 power controller managing second optical components within the optical network.