PON Node Repetition Coding for Power Budget Adaptation
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Solution Overview
Problem
Conventional passive optical networks (PONs) face challenges in accommodating varying power requirements across different users due to differences in transmission path characteristics, leading to inefficient resource allocation and complex network operations.
Innovation Solution
A point-to-multi-point communication method that uses repetition coding and soft-addition decoding to adjust data rates and power budgets, allowing for flexible modulation schemes like OOK and PAM, and incorporates FEC encoding to optimize signal quality and power usage across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network is designed to support user terminals with the greatest power loss, then all users can be accommodated, but network resources are wasted on user terminals that do not require higher power level
Solution Approach 1:
The patent applies local quality by allowing different user terminals to use different modulation schemes (OOK, PAM4, etc.) based on their specific power budget requirements. Each terminal's transmission characteristics are locally optimized rather than using a uniform approach across the entire network, thereby avoiding resource waste on terminals with lower power needs while maintaining compatibility for terminals with higher power losses.
Solution Approach 2:
The network dynamically adjusts modulation schemes and data rates based on real-time power budget conditions. Terminals can switch between different modulation formats (e.g., from OOK to PAM4 or vice versa) depending on their measured power loss characteristics, enabling the system to adapt its resource allocation dynamically rather than being static.
2Adaptability or versatility
If flexible modulation is employed to accommodate different link loss budgets, then power requirements are met, but receiver implementation becomes more difficult and operation is complicated
Solution Approach 1:
The patent segments the network into different operational modes or groups based on power budget requirements. Terminals with similar characteristics are handled using the same modulation scheme, which simplifies receiver design within each segment while still providing overall flexibility across the heterogeneous network.
Solution Approach 2:
The system changes key transmission parameters (modulation order, symbol rate, power level) based on measured power loss conditions. By adjusting these parameters rather than fundamentally changing the receiver architecture, the system achieves adaptability while controlling implementation complexity.
3Adaptability or versatility
If PAM modulation schemes are used for higher power level user terminals, then power budget is accommodated, but receiver sensitivity is worse and clock and data recovery is more difficult
Solution Approach 1:
The system performs preliminary power loss measurement and characterization during network setup or initialization. Based on these preliminary results, appropriate modulation schemes are selected before actual data transmission begins, preventing the use of PAM4 when OOK would be more suitable and thereby avoiding receiver sensitivity issues.
Solution Approach 2:
The patent implements feedback mechanisms where terminals report their measured power loss characteristics to the network operator or control entity. This feedback loop enables continuous optimization of modulation scheme selection, ensuring that PAM4 is only used when truly necessary and that terminals switch to more robust schemes like OOK when conditions improve or change.
Data Source
AI summary
A communication method and device are provided for communication in a point-to-multi-point communication network. A communication method includes receiving, by a node of a plurality of multi-point nodes, a transmission frame comprising a header including a repetition information and a data section comprising multiple modulation symbols, with at least two repeated modulation symbols that are repeated to represent a first modulation symbol; extracting, by the node, the repetition information of the header; recovering, by node, the amplitude of each modulation symbol of the at least two repeated modulation symbols; and combining, by the node, the amplitudes of the at least two repeated modulation symbols, based on the repetition information, to reconstruct the first modulation symbol represented by the at least two repeated modulation symbols.