OTN Frame Overhead Signaling for Fast Rate Adjustment
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Solution Overview
Problem
Existing optical transport networks (OTNs) face challenges in flexibly and quickly adjusting the transmission rate of fine-granularity services due to long OPU multiframe periods and complex G.HAO lossless bandwidth adjustment mechanisms, leading to inflexible and slow rate adjustments.
Innovation Solution
Inserting first and second indications into the overhead area of a frame to indicate rate adjustments, allowing for flexible and rapid changes in transmission rates by adjusting the number of time slots allocated to the second layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional OTN uses long OPU multiframe periods and complex G.HAO lossless bandwidth adjustment mechanisms, then service data transmission reliability is improved, but rate adjustment flexibility and speed deteriorate
Solution Approach 1:
The patent segments the rate adjustment control into two independent parts: a control indication inserted into the overhead area of the first frame, and a separate mapping adjustment process. This segmentation allows the control indication to be processed independently from the complex G.HAO mechanism, enabling flexible rate adjustment while maintaining transmission reliability through the preserved multiframe period structure.
Solution Approach 2:
The patent introduces a control indication as an intermediary element between the rate adjustment decision and the actual mapping process. This control indication, inserted into the overhead area, serves as a mediator that triggers the mapping device to adjust the mapping relationship without requiring complex real-time recalibration, thus improving adaptability while maintaining reliability.
2Stability of the object's composition
If traditional OTN uses long OPU multiframe periods, then transmission stability is improved, but rate adjustment speed deteriorates
Solution Approach 1:
The patent applies preliminary action by inserting the control indication into the overhead area of the first frame before the rate adjustment needs to take effect. This allows the mapping device to prepare for the rate change in advance, processing the adjustment signal ahead of time while maintaining stable transmission during the multiframe period, thus achieving both stability and speed.
Solution Approach 2:
The patent introduces dynamics by making the mapping relationship adjustable through the control indication while preserving the stable multiframe period structure. The mapping device can dynamically adapt to rate changes triggered by the control indication without disrupting the overall transmission stability, achieving flexible adjustment speed without compromising stability.
3Reliability
If complex G.HAO lossless bandwidth adjustment mechanisms are used, then lossless bandwidth adjustment capability is improved, but device complexity and adjustment overhead increase
Solution Approach 1:
The patent extracts the rate adjustment control function from the complex G.HAO mechanism by using a simple control indication inserted into the overhead area. This extraction allows the system to maintain lossless bandwidth adjustment capability through the preserved mapping relationship while significantly reducing the complexity of the adjustment mechanism itself, as the control indication is processed independently from the complex G.HAO calculations.
Data Source
AI summary
A mapping method includes: inserting a first indication and/or a second indication into an overhead area of a first frame. The first indication is configured to indicate adjusting a rate of the first frame, and the second indication is configured to indicate adjusting the rate of the first frame from a first rate to a second rate.