PON Channel Bonding via Packet Fragmentation
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Solution Overview
Problem
Conventional passive optical network (PON) systems face inefficiencies in utilizing aggregated link capacity, often utilizing only 40-60% of the combined link capacity, and incur significant latency and buffering requirements when trying to achieve high data rates through link aggregation schemes.
Innovation Solution
An inverse multiplexing scheme, specifically channel bonding, is implemented by modifying the preamble of data packets to include indicators for lane identification, fragmenting packets into frames, and transmitting these frames over multiple lanes, allowing for efficient aggregation of bandwidth and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional link aggregation schemes are used to increase throughput, then aggregated bandwidth is achieved, but utilization efficiency is low (only 40-60% of capacity)
Solution Approach 1:
The data packet is segmented into multiple frames that can be transmitted simultaneously over multiple wavelength channels. Each frame carries a portion of the original data, enabling parallel transmission and improving bandwidth utilization efficiency by fully utilizing all aggregated link capacity
Solution Approach 2:
Multiple wavelength channels are merged into a single logical communication path through inverse multiplexing. The receiver combines the transmitted frames from multiple channels to reconstruct the original data packet, achieving both high throughput and full bandwidth utilization
2Productivity
If link aggregation is used to achieve high data rates, then bandwidth capacity increases, but latency increases
Solution Approach 1:
By dividing the data packet into smaller frames that can be transmitted in parallel over multiple channels, the transmission time is reduced. Simultaneous transmission of multiple frames eliminates the sequential transmission delay inherent in conventional link aggregation, thereby reducing latency while maintaining high data rates
Solution Approach 2:
The inverse multiplexing scheme enables continuous transmission of data frames across multiple channels without idle periods. All channels remain actively transmitting throughout the communication process, eliminating waiting times and reducing overall transmission latency
3Productivity
If link aggregation is used to increase throughput, then aggregated capacity is achieved, but buffering requirements increase
Solution Approach 1:
Segmenting data into smaller frames that can be independently transmitted and reassembled reduces the need for large buffers. The receiver can process and reassemble frames as they arrive from multiple channels, minimizing buffering requirements while maintaining aggregated capacity
Data Source
AI summary
A method implemented at a transmitter in a passive optical network (PON), the method comprising the transmitter fragmenting a data packet into multiple frames, with each frame of the multiple frames including a data packet preamble, with the data packet preamble including an indicator associated with at least one lane to be used to transmit the data packet and a logical link identifier (LLID), the indicator identifying a first lane selected from a plurality of lanes, identifying at least one frame transmitted over the first lane, and identifying the lane order of the plurality of lanes, and the transmitter transmitting the multiple frames over the plurality of lanes.