PON Uplink Burst Synchronization Data Block for OLT Identification
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Solution Overview
Problem
Current PON systems face inefficiencies in uplink data transmission due to the inability to quickly identify which ONU is sending data, leading to decreased efficiency and effective bandwidth, as the electrical-domain equalizer requires optimization and convergence using long preambles or training codes, which hinder valid data transmission during this process.
Innovation Solution
Incorporating a synchronization data block with a narrower frequency distribution in uplink burst data that includes a preamble and an identifier for the ONU, allowing the OLT to quickly identify the source and configure equalization parameters, thereby reducing data transmission time and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electrical-domain equalizer uses long preambles or training codes for optimization and convergence, then the equalization accuracy is improved, but the data transmission time is increased and uplink efficiency is decreased
Solution Approach 1:
The uplink burst data is segmented into two distinct parts: a synchronization data block containing a narrowband synchronization signal for rapid ONU identification, and a payload containing the actual wideband data. This segmentation allows the system to perform identification and equalization configuration separately, avoiding the need for long training codes while maintaining equalization accuracy.
Solution Approach 2:
The OLT performs ONU identification and equalization parameter configuration in advance, before the actual data transmission begins. By using the narrowband synchronization signal to quickly identify the ONU and pre-configure the equalizer parameters, the system eliminates the need for time-consuming convergence processes during data transmission, thus reducing transmission time while maintaining accuracy.
2Productivity
If the OLT cannot quickly identify which ONU is sending data, then the system structure remains simple, but the uplink efficiency and effective bandwidth are decreased
Solution Approach 1:
A narrowband synchronization signal is introduced as an intermediary element between the ONU and OLT. This synchronization signal serves as a mediator that enables the OLT to quickly identify the transmitting ONU and retrieve corresponding equalization parameters from storage, thereby improving uplink efficiency without significantly increasing system complexity.
Solution Approach 2:
The system uses a simplified narrowband version of the synchronization signal that carries essential identification information. This 'copy' or simplified representation allows rapid ONU identification and parameter retrieval without requiring the full complexity of wideband training sequences, thus improving efficiency while maintaining manageable system complexity.
3Speed
If the bandwidth of the synchronization data is made narrower than the payload, then the ONU identification speed is improved, but the synchronization data occupies less spectral resources
Solution Approach 1:
The synchronization data block is designed with localized narrowband characteristics specifically tailored for rapid ONU identification, while the payload maintains wideband properties for high-capacity data transmission. This local quality differentiation allows the synchronization portion to occupy minimal spectral resources while achieving fast identification, and the payload to utilize full spectral resources for efficient data transmission.
Data Source
AI summary
A data transmission method includes receiving, by an optical line terminal (OLT) from an optical network unit (ONU), uplink burst data that includes a synchronization data block and a payload, where the synchronization data block includes first synchronization data, wherein the first synchronization data includes a first preamble and an ONU identifier, and a first bandwidth occupied by the first frequency distribution of the first synchronization data is narrower than a second bandwidth occupied by the second frequency distribution of the payload, and obtaining, by the OLT from the first synchronization data, the ONU identifier.