FlexO/ZR Asynchronous Adaptation via Variable Frame Length
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Solution Overview
Problem
Existing solutions for Flexible Optical Transport Network (FlexO)/ZR asynchronous adaptation add additional overhead, requiring a trade-off between line performance and payload capacity, as they operate on fixed frame structures and do not efficiently adapt signal rates.
Innovation Solution
The method involves dynamically adjusting the frame period by adding information about idle/stuffing data using a sigma delta function, allowing for variable frame lengths without additional overhead, and repurposing existing frame markers for error correction and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mapping data into a new frame structure with additional overhead is used, then asynchronous adaptation capability is improved, but line performance deteriorates due to reduced payload capacity
Solution Approach 1:
The invention extracts and removes the additional overhead that was previously added to frames for asynchronous adaptation. By using the existing frame structure without adding new overhead fields, the solution eliminates the trade-off between adaptability and payload capacity, allowing full utilization of the available bandwidth for payload data while maintaining asynchronous adaptation capabilities through alternative mechanisms.
2Device complexity
If fixed frame structures are used, then device complexity is reduced, but adaptability to different signal rates deteriorates
Solution Approach 1:
The invention introduces dynamic adjustment capabilities to the frame structure by allowing variable frame periods and flexible mapping of payload data across frames with different rates. This enables the system to adapt to different signal rates while maintaining a relatively simple base frame structure, resolving the contradiction between structural simplicity and adaptability.
Solution Approach 2:
The invention changes key parameters of the frame structure, specifically the frame period and the amount of payload data per frame, to accommodate different signal rates. By dynamically adjusting these parameters rather than changing the fundamental frame structure, the system achieves rate adaptability while keeping device complexity low.
3Reliability
If additional overhead is added for asynchronous mapping, then rate preservation capability is improved, but line rate requirements increase
Solution Approach 1:
The invention removes the additional overhead that was previously required for asynchronous mapping and rate preservation. By utilizing the existing frame structure and overhead fields more efficiently, the system achieves rate preservation capability without increasing line rate requirements, thereby reducing power consumption and bandwidth usage.
Data Source
AI summary
An asynchronous adaptation process includes receiving a first plurality of frames of a first interface group at a first rate, determining idle/stuffing data to be added in each of the first plurality of frames based on a second rate associated with a second plurality of frames of a second interface group, adding information about the idle/stuffing data in each frame of the first plurality of frames in a preceding frame, and transmitting the second plurality of frames of the second interface group with the idle/stuffing data included therein, wherein the second plurality of frames includes the first plurality of frames with the idle/stuffing data.