PON Frame Layout With PSB-Embedded FEC Codewords
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Solution Overview
Problem
Existing PON frame designs face challenges in efficiently utilizing bits, especially at various line rates, and struggle to maintain integer numbers of codewords regardless of line rates.
Innovation Solution
The proposed solution involves generating PON frames with a plurality of FEC codewords, where the first codeword includes a Physical Synchronization Block (PSB), allowing for adjustable PSB lengths and independent codeword lengths, ensuring scalability across different line rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing PON frame designs are used, then the frame structure is simple, but bit utilization efficiency deteriorates at various line rates
Solution Approach 1:
The PON frame is segmented into multiple FEC codewords, where the first codeword contains the PSB and subsequent codewords contain payload data. This segmentation allows flexible allocation of bits across different line rates while maintaining structural organization, thereby improving bit utilization efficiency without excessive complexity.
Solution Approach 2:
The frame structure employs dynamic parameters including adjustable PSB lengths and independent codeword lengths that can be configured based on different line rates (e.g., 2.5G, 10G, 25G, 50G). This dynamic adaptability enables optimal bit utilization across varying transmission rates while preserving a relatively simple underlying frame architecture.
2Ease of operation
If fixed codeword structures are used, then the implementation is straightforward, but maintaining integer numbers of codewords across various line rates becomes difficult
Solution Approach 1:
The invention changes key parameters including codeword length (e.g., 17,280 bits or 17,408 bits), PSB length (e.g., 192, 256, or 384 bits), and the number of codewords per frame (e.g., 360 or 370 codewords). These parameter adjustments enable the frame structure to maintain integer numbers of codewords across different line rates (2.5G, 10G, 25G, 50G) while preserving implementation straightforwardness through consistent FEC encoding schemes.
3Adaptability or versatility
If scalable PON frame designs are implemented, then adaptability to different line rates improves, but frame structure complexity increases
Solution Approach 1:
The PON frame structure is designed with universal characteristics where a single frame format can operate across multiple line rates (2.5G, 10G, 25G, 50G) by adjusting parameters such as codeword count and PSB length. This multi-functionality achieves scalability without proportionally increasing structural complexity, as the underlying FEC coding and frame organization remain consistent.
Solution Approach 2:
Scalability is achieved through controlled parameter changes rather than fundamental structural modifications. By adjusting codeword lengths, PSB lengths, and codeword counts, the same frame architecture can adapt to different line rates, limiting complexity increase to only the parameter configuration layer while maintaining a relatively simple core structure.
Data Source
AI summary
A method comprises generating a PON frame comprising a plurality of FEC codewords, the FEC codewords comprise a first codeword, and the first codeword comprises a PSB; and transmitting the PON frame. A method comprises receiving a PON frame comprising a plurality of FEC codewords, the FEC codewords comprise a first codeword, and the first codeword comprises a PSB; and processing the PON frame.