FlexO Group Interface Service Data Restoration
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Solution Overview
Problem
The existing fixed-rate optical transport network interfaces are inadequate for meeting the growing service traffic interconnection requirements, leading to failures when a physical port in a flexible optical transport network (FlexO) group interface fails, causing the entire interface to be deemed failed and preventing recovery of the OTUCn signal.
Innovation Solution
A method and device for generating OTN encapsulated signals with FlexO frames that include both data and check frames, allowing for lossless restoration of service data when bit error rates exceed a reference rate, even if some physical ports fail, by using redundancy coding and error correction mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a FlexO group interface uses multiple physical ports to transmit service data, then the interconnection capability and bandwidth are improved, but the system reliability deteriorates because failure of any single port causes the entire interface to fail
Solution Approach 1:
The patent segments the service data transmission by creating multiple independent transmission paths through different physical ports. Each port transmits a separate FlexO frame containing portions of the service data, allowing the system to maintain interconnection capability while distributing risk across multiple segments so that failure of one segment does not cause complete interface failure.
Solution Approach 2:
The patent implements beforehand cushioning by generating check data (FEC codes) in advance and embedding it in the FlexO frames before transmission. This pre-prepared redundancy data acts as a cushion against potential port failures, enabling the receive-end to reconstruct lost service data even when some physical ports fail during transmission.
2Productivity
If the system transmits service data through multiple physical ports simultaneously, then the data transmission capacity is improved, but the complexity of error detection and data restoration increases
Solution Approach 1:
The patent implements feedback mechanisms by embedding check data in each FlexO frame and using this feedback information at the receive-end to detect errors and restore lost data. The check data provides continuous feedback about the integrity of transmitted data, enabling automatic error detection and correction without increasing operational complexity.
Solution Approach 2:
The patent changes the parameter structure of the transmitted data by adding check data as a separate parameter alongside service data. This parameter transformation converts the complex problem of multi-port error detection into a simpler mathematical reconstruction problem that can be solved systematically using FEC algorithms.
3Reliability
If check data is added to enable data restoration, then the reliability is improved, but the bandwidth efficiency deteriorates due to increased data overhead
Solution Approach 1:
The patent applies partial action by generating check data for only a portion of the service data rather than duplicating all data. The check data covers k out of n FlexO frames, providing sufficient redundancy for restoration while minimizing the overhead ratio, thus maintaining reasonable bandwidth efficiency.
Data Source
AI summary
This application discloses a service data processing method and device. A transmit-end device may generate an optical transport network (OTN) encapsulated signal carrying service data, and generate at least n FlexO (flexible optical transport network) frames based on the OTN encapsulated signal and send the at least n FlexO frames, where r FlexO frames in the at least n FlexO frames carry service check data, and the service check data may be used to restore the service data when bit error rates of k FlexO frames are greater than a reference bit error rate. In this way, if no more than r physical ports included in a FlexO group interface fail, or a bit error rate of no more than r FlexO frames is greater than the reference bit error rate due to another reason, a receive-end device may restore the service data through a received FlexO frame.