GPON GTC Frame Structure Alignment for Bandwidth Scaling
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Solution Overview
Problem
Current passive optical network (PON) systems face challenges in supporting increased bandwidth demands and a larger number of optical network units (ONUs) due to limitations in existing protocols, such as the GPON protocol, which struggle to efficiently handle higher transmission rates and more data flows without substantial upgrades or increased complexity.
Innovation Solution
The GPON protocol's GTC layer is extended by modifying frame structures to align field lengths with scaled word boundaries, enabling higher bandwidth support up to ten Gbps and accommodating more ONUs by increasing field lengths to integer multiples of four bytes, while deprecating unused ATM functionality and updating control and management information fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the GPON protocol is used with existing frame structures, then the system can maintain current electronic circuit speeds and processing capabilities, but the bandwidth capability is limited to about 2.5 Gbps downstream and 1.25 Gbps upstream
Solution Approach 1:
The patent changes the word boundary parameter from 1 byte to 4 bytes in the GTC layer frame structure. This parameter change allows the frame fields to be aligned with 4-byte boundaries, enabling efficient processing at higher bandwidths (up to 10 Gbps downstream and 2.5 Gbps upstream) while maintaining compatibility with existing electronic circuit speeds without requiring substantial protocol upgrades
2Productivity
If the frame field lengths are increased to support higher bandwidths, then the system can accommodate more data flows and ONUs, but the processing complexity and upgrade requirements increase
Solution Approach 1:
The patent extends the GTC layer frame structure by increasing field lengths to 4-byte boundaries, which is more than the original 1-byte boundaries. This partial extension provides sufficient capacity for higher bandwidths and more ONUs without requiring a complete protocol redesign, thus avoiding substantial upgrades while achieving the needed productivity increase
3Adaptability or versatility
If ATM functionality is retained in the GTC layer, then the system maintains backward compatibility with existing GPON implementations, but unused functionality increases protocol complexity without providing value
Solution Approach 1:
The patent extracts and removes the unused ATM functionality from the GTC layer frame structure while retaining the essential GPON protocol elements. This extraction reduces protocol complexity by eliminating unnecessary components while maintaining backward compatibility through the preserved core GTC layer structure and 4-byte alignment compatibility
Data Source
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AI summary
An apparatus includes at least one component configured to implement a method. The method includes: encapsulating a data stream into at least one Gigabit Passive Optical Network (GPON) Encapsulation Method (GEM) frame, where the GEM frame comprises a header aligned with a word boundary of at least about four bytes; encapsulating the GEM frame into a GPON Transmission Convergence (GTC) frame.