OTN Relay Node Defect Detection via Transparent OTUk Transmission
Solution Overview
Problem
Current service transmission processing methods in Optical Transport Networks (OTNs) are inadequate as they require simultaneous detection of defects in both the Optical Channel (OCh) and Optical channel Transport Unit (OTUk) paths between specific nodes, failing to detect defects between other nodes, leading to incomplete protection and potential service disruptions.
Innovation Solution
A service transmission processing method where a 3R relay node decapsulates and re-encapsulates service data, allowing transparent transmission of OTUk across the relay node, enabling defect detection on OTUk paths that span multiple nodes, thereby improving defect detection and triggering targeted protection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If defect detection is performed only between adjacent nodes (node A to node B, node B to node C), then the detection process is simple, but defects spanning multiple nodes (node A to node C) cannot be detected
Solution Approach 1:
The patent segments the defect detection function by introducing intermediate indication information at the node B level. Instead of requiring end-to-end detection between node A and node C, the system divides detection into segments (A-B and B-C) with node B providing intermediate status indication. This allows comprehensive defect detection while maintaining manageable complexity at each node.
Solution Approach 2:
Node B acts as an intermediary by generating and forwarding indication information about defects it detects to node C. This intermediary mechanism enables node C to infer defects occurring between node A and node B without node C needing to directly detect them, thus extending detection capability while keeping each node's processing relatively simple.
2Reliability
If switching is triggered only when both OCh and OTUk defects are detected simultaneously at node C, then false switching is reduced, but switching cannot be triggered when defects occur before node C
Solution Approach 1:
Node B performs preliminary defect detection and generates indication information before the defect would otherwise reach node C. This preliminary action allows node C to receive advance warning of defects occurring upstream (between A and B), enabling timely switching decisions without waiting for simultaneous OCh and OTUk defect confirmation at node C.
Solution Approach 2:
The system implements feedback through indication information flowing from node B to node C. Node C uses this feedback about upstream defects combined with its own local defect detection to make informed switching decisions. This feedback mechanism maintains switching accuracy while enabling response to defects that occur anywhere along the transmission path.
3Reliability
If the protection scope is limited to adjacent nodes only, then the protection mechanism is simple to implement, but defects outside this scope remain unprotected
Solution Approach 1:
The protection mechanism is made universal by enabling node C to protect services against defects occurring anywhere on the A-C path, not just between B and C. Through the indication information from node B, the same protection mechanism at node C handles both local defects (B-C) and remote defects (A-B), extending protection coverage without requiring separate protection mechanisms for each segment.
Data Source
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AI summary
Embodiments of the present invention disclose a service transmission processing method, a node device and a network system are provided. One method includes: receiving service data after relay processing by a 3R relay node, where the relay processing includes terminating and regenerating an Optical Channel (OCh) of the service data, and when the OCh is terminated, transparent transmission is performed on an Optical channel Transport Unit (OTU); and performing defect detection on a path of the OTU to obtain a detection result of the path of the OTU. Another method includes: obtaining an overhead in an Optical Transport Network (OTN) frame; and judging whether the overhead includes a Client Signal Fail (CSF) inserted after a signal fails, and if the overhead includes the CSF, determining a path where a defect occurs according to the CSF.