OTN Frame Mapping with 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 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 quick rate changes by adjusting the number of time slots allocated between layers, and determining a Cm value for mapping based on the adjusted rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional OTN bandwidth adjustment mechanisms are used, then service transmission is stable, but rate adjustment is slow and inflexible
Solution Approach 1:
The patent segments the bandwidth adjustment process into independent indication fields (first indication for rate adjustment, second indication for rate change) that can be inserted and processed separately in the overhead area, enabling granular and rapid control of frame rates without affecting the entire transmission system
Solution Approach 2:
The patent introduces dynamic rate adjustment by allowing the frame rate to be flexibly changed based on service demands through the inserted indications. The system transitions from static predetermined rates to dynamic adjustable rates, enabling real-time adaptation to changing traffic conditions
2Adaptability or versatility
If OPU multiframe structure is used, then fine-granularity services are supported, but adjustment mechanism becomes complex
Solution Approach 1:
The patent extracts the rate adjustment control functions from the complex OPU multiframe structure and concentrates them into specific overhead fields (first indication and second indication). This separation simplifies the adjustment mechanism by isolating control signals from the data transmission path, making the system easier to manage while maintaining fine-granularity support
Solution Approach 2:
The patent prepares rate adjustment indications in advance by inserting them into the overhead area before actual rate changes are needed. This preliminary placement of control information allows the receiving end to anticipate and prepare for rate adjustments, reducing the complexity of real-time decision-making
Data Source
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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.