Wavelength Adjustment for OLT ONU Service Continuity
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Solution Overview
Problem
Current TWDM PON systems lack effective communication channels and information interaction logics for wavelength adjustment, leading to disruptions in service continuity during ONU switching between different TWDM channels, especially when transceiver apparatuses are integrated or distributed across different line cards or manufacturers.
Innovation Solution
A method and apparatus for wavelength adjustment in OLT/ONU systems, involving notification, acknowledgement, command, and error messages (PLOAM and IOC messages) to facilitate seamless switching between TWDM channels, ensuring continuous service by establishing communication channels and interaction logics between source and target OLTs and ONUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLT transceiver apparatuses are distributed in different line cards or provided by different manufacturers, then adaptability and versatility are improved, but device complexity and communication coordination difficulty increase
Solution Approach 1:
The patent establishes a universal wavelength adjustment communication mechanism that works across different OLT transceiver apparatuses regardless of manufacturer or line card location. The standardized message formats (adjustment notification, acknowledgment, command messages) enable any OLT to communicate with any ONU wavelength tuning requirements, achieving multi-vendor and multi-line-card compatibility without requiring proprietary communication protocols.
Solution Approach 2:
The patent introduces intermediary communication messages as mediators between source OLT, target OLT, and ONU during wavelength adjustment. These messages (adjustment notification sent to target OLT, adjustment acknowledgment from target OLT, PLOAM commands to ONU) facilitate coordinated interaction among distributed transceiver apparatuses, enabling seamless wavelength switching across different line cards and manufacturers through standardized information exchange.
2Reliability
If wavelength adjustment is performed during ONU operation, then service continuity is maintained, but communication coordination and information interaction complexity increase
Solution Approach 1:
The patent implements preliminary action by sending adjustment notification messages to the target OLT before the actual wavelength switching occurs. The target OLT prepares in advance by allocating resources and configuring its transceiver apparatus, ensuring that when the ONU switches wavelengths, the target is ready to immediately establish communication. This preliminary preparation maintains service continuity while managing complexity through structured advance coordination.
Solution Approach 2:
The patent employs feedback mechanisms where the target OLT sends adjustment acknowledgment messages back to the source OLT, confirming readiness to receive the switching ONU. The source OLT also monitors the wavelength adjustment process and can send cancellation messages if issues arise. This bidirectional feedback ensures coordinated wavelength adjustment while maintaining service continuity through real-time status awareness and error handling.
3Reliability
If communication channels are established between source OLT and target OLT for wavelength adjustment, then service continuity during switching is ensured, but device complexity increases
Solution Approach 1:
The patent introduces intermediary communication messages as mediators between source OLT, target OLT, and ONU during wavelength adjustment. These messages (adjustment notification, adjustment acknowledgment, PLOAM commands) facilitate coordinated interaction among distributed transceiver apparatuses, enabling seamless wavelength switching across different line cards and manufacturers through standardized information exchange.
Solution Approach 2:
The patent establishes a universal wavelength adjustment communication mechanism that works across different OLT transceiver apparatuses regardless of manufacturer or line card location. The standardized message formats enable any OLT to communicate with any ONU wavelength tuning requirements, achieving multi-vendor and multi-line-card compatibility without requiring proprietary communication protocols.
Data Source
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AI summary
The disclosure provides a method and apparatus for adjusting wavelength for an Optical Line Terminal/Optical Network Unit (OLT/ONU). The method for adjusting wavelength for an OLT includes that: a source OLT sends an adjustment notification message to a target OLT, wherein the adjustment notification message is used for indicating that an ONU is to be adjusted into a Time-Wavelength Division Multiplexing Channel (TWDM CH) of the target OLT; and the source OLT receives an adjustment acknowledgement message provided by the target OLT, wherein the adjustment acknowledgement message is used for indicating that an adjustment process of the ONU has been completed. By means of the technical solution provided in the disclosure, an ONU of a source OLT can still work normally after being switched to a channel of a target OLT, thereby achieving the effect that the continuity of a service between the OLT and the ONU may be maintained.