ODUk Protection Tangent Rings Virtual Node Switching
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Solution Overview
Problem
Existing ODUk protection tangent rings face long switching times and potential errors due to the need to query the state of the other ring using the APS protocol when one ring fails, leading to multiple switching occurrences.
Innovation Solution
Establishing virtual nodes on intersection nodes within the tangent rings allows for direct switching without querying the state of the other ring, by creating connections between service units and protected units through these virtual nodes, thereby reducing the need for state determination and minimizing switching errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the APS protocol is used to query the state of the other ring before switching, then the switching decision can be made accurately, but the switching time becomes too long and multiple switching errors may occur
Solution Approach 1:
The patent applies preliminary action by pre-establishing virtual nodes and pre-configuring switching paths before any failure occurs. When a failure happens, the system can immediately switch services through the pre-prepared virtual nodes without needing to query the other ring's state via APS protocol, thus reducing switching time while maintaining accuracy.
Solution Approach 2:
The patent introduces virtual nodes as intermediary elements between the two rings. These virtual nodes act as mediators that enable direct switching between rings without requiring complex state queries. The virtual nodes absorb the complexity of state determination, allowing fast switching decisions to be made locally without waiting for APS protocol interactions.
2Reliability
If the state of the other ring is queried using APS protocol, then the switching decision can be made with complete information, but the switching process becomes complex and error-prone
Solution Approach 1:
The patent extracts the state determination function from the APS protocol interaction and relocates it to local virtual node decisions. By taking out the complexity of remote state querying and replacing it with local virtual node-based switching, the system achieves simplified switching processes while maintaining accurate decision-making through pre-established virtual connection mappings.
Solution Approach 2:
The patent creates virtual copies of the ring topology through virtual nodes. These virtual copies allow the system to simulate and determine switching paths locally without actually querying the physical state of the other ring. The virtual nodes replicate the necessary switching logic, enabling accurate switching decisions to be made independently and simplifying the overall switching process.
Data Source
AI summary
A method for realizing interaction of optical channel data unit (ODUk) protection tangent rings are provided. A node used for protection of the ODUk and a receiving unit, a sending unit, a protected receiving unit and a protected sending unit on the node are selected. A connection between a receiving service unit and the protected sending unit with the same transmission direction on the node is established, or a connection between a sending service unit and the protected receiving unit with the same transmission direction on the node is established. Two virtual nodes are established on the node if the node is an intersection node, and connections between the receiving service unit and the protected sending unit, and between the sending service unit and the protected receiving unit are established respectively in each direction of both directions through one of the virtual nodes.