PON System Dual Upstream Channels for Low-Latency Data Transmission
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Solution Overview
Problem
Passive optical network (PON) systems face delays in upstream service data transmission due to the need for ONUs to stop sending data during registration processes, which cannot satisfy low-delay service requirements like high-definition video or augmented reality services.
Innovation Solution
Implementing a PON system with two upstream channels, where one channel is dedicated for registration and the other for data transmission, allowing registered ONUs to send upstream service data without interruption during registration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single upstream channel is used for both registration and data transmission, then device complexity is reduced, but upstream service data transmission delay increases because registered ONUs must stop sending data during registration processes
Solution Approach 1:
The upstream channel is segmented into two separate channels: a first upstream channel dedicated for data transmission and a second upstream channel dedicated for registration. This segmentation allows registered ONUs to transmit data on the first channel without interruption while new ONUs perform registration on the second channel, thereby resolving the contradiction between device complexity and transmission delay.
2Reliability
If registered ONUs stop sending upstream service data during ONU registration, then registration reliability is improved by preventing data conflicts, but productivity of data transmission deteriorates due to interruptions
Solution Approach 1:
By segmenting the upstream channel into a first upstream channel for data transmission and a second upstream channel for registration, the patent enables simultaneous registration and data transmission without conflicts. Registered ONUs transmit data on the first channel while new ONUs register on the second channel, maintaining both registration reliability and data transmission productivity.
Solution Approach 2:
The second upstream channel acts as an intermediary dedicated for registration processes. By providing a separate communication path for registration, the patent allows this function to proceed without interfering with the primary data transmission function on the first upstream channel, thereby maintaining both reliability and productivity.
3Ease of operation
If a single upstream channel is used, then ease of operation is improved, but system delay requirement for low-delay services cannot be satisfied
Solution Approach 1:
The upstream channel is divided into two specialized channels: the first upstream channel optimized for data transmission and the second upstream channel optimized for registration. This segmentation enables low-delay services to be transmitted without interruption during registration processes, satisfying system delay requirements while maintaining manageable operation through clear channel specialization.
Data Source
AI summary
The present disclosure relates to passive optical network (PON) systems, an optical line terminal (OLT), and an optical network unit (ONU). One example PON system includes an OLT and at least two ONUs, and the OLT and the ONUs exchange data on one downstream channel and two upstream channels. The OLT sends downstream data to each ONU on the downstream channel, where the downstream data includes an upstream bandwidth grant which is used to control the ONU to send upstream data. Each ONU receives the downstream data on the downstream channel, and sends the upstream data on a first upstream channel or a second upstream channel based on the upstream bandwidth grant included in the downstream data. The OLT receives, on the first upstream channel and the second upstream channel, the upstream data sent by each ONU.