WDM-PON ONU State Migration for Management-Channel Synchronization Loss
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Solution Overview
Problem
Existing WDM-PON systems lack a state migration mechanism to handle the loss of management TC data path signal synchronization during the ONU registration and activation process, leading to potential ONU control issues.
Innovation Solution
Introduce a MLODS sub-state in the ONU operation state to manage loss of management TC data path signal synchronization, with timers to monitor restoration times and transition to other states based on preset thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ONU remains in the operation state without state migration mechanism for management TC data path synchronization loss, then the system structure remains simple, but the ONU control reliability deteriorates due to potential control loss
Solution Approach 1:
The operation state is segmented into two distinct states: operation state and MLODS sub-state. This segmentation allows the system to differentiate between normal operation and management TC data path synchronization loss conditions, enabling appropriate control actions for each state while maintaining overall system reliability.
Solution Approach 2:
The system implements dynamic state migration between operation state and MLODS sub-state based on synchronization status. The ONU can transition between states according to real-time management TC data path synchronization conditions, providing adaptive control that maintains reliability without requiring complex permanent structural changes.
2Measurement precision
If the ONU transitions to MLODS sub-state and monitors restoration time, then the synchronization control precision is improved, but the system complexity increases due to timer monitoring and state management
Solution Approach 1:
The system pre-configures the MLODS sub-state and associated timer monitoring mechanisms before synchronization loss occurs. When management TC data path synchronization is lost, the ONU can immediately transition to the pre-prepared MLODS state and start monitoring restoration time, eliminating delays and reducing the complexity of on-the-fly state creation.
Solution Approach 2:
The system implements feedback through timer monitoring that continuously checks whether management TC data path synchronization has been restored. This feedback mechanism provides precise measurement of restoration time and triggers automatic state transitions back to operation state when synchronization is recovered, improving monitoring precision while using standardized feedback control patterns.
3Productivity
If the ONU implements automatic state transition based on synchronization status, then the operational efficiency is improved, but the control system complexity increases
Solution Approach 1:
The ONU performs self-service through automatic state transitions between operation state and MLODS sub-state based on its own synchronization status detection. The system monitors its own management TC data path synchronization and autonomously migrates states without external control, improving operational efficiency while containing complexity within the ONU itself rather than requiring complex external control systems.
Data Source
AI summary
A downlink signal synchronization method and system are described. The method is applied to a wavelength division multiplexing passive optical network, including: when an optical network unit (ONU) is in a running state, detecting whether the synchronization of downlink signals is lost, the downlink signals comprising a management channel signal and a data channel signal; when the synchronization of the management channel signal is lost and the data channel signal is normally synchronized, switching the ONU from the running state to a management channel synchronization loss sub-state; monitoring a first recovery time of the ONU for recovering management channel signal synchronization in the management channel synchronization loss sub-state; and if the first recovery time does not exceed a first preset time threshold and the data channel signal is still normally synchronized, returning the ONU from the management channel synchronization loss sub-state to the running state.