Optical Line Termination Dual-Channel Service Transmission
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Solution Overview
Problem
In passive optical networks (PONs), the upstream service delay for online ONUs is increased due to reserved time periods during which they are not allowed to perform upstream services, leading to potential service disruptions for high-delay requirement services like virtual reality and cloud gaming.
Innovation Solution
The method involves allocating an identifier and performing ranging through a first channel, followed by negotiating the use of two channels for information transmission, where the OLT and ONU determine the channel configuration based on supported capabilities and path delay differences to ensure low-delay data transmission through a second channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the OLT reserves time periods for ONU registration, then new ONUs can perform registration and establish connections, but the upstream service delay for online ONUs increases
Solution Approach 1:
The patent divides the upstream transmission channel into multiple channels (first upstream channel and second upstream channel). The first channel is dedicated to registration functions while the second channel is dedicated to service data transmission. This segmentation allows simultaneous registration and service transmission without mutual interference, resolving the contradiction between ensuring registration capability and reducing service delay.
2Device complexity
If a single channel is used for both registration and service transmission, then device complexity is reduced, but service delay increases due to time-sharing constraints
Solution Approach 1:
The patent introduces a new dimension (channel dimension) to separate registration traffic and service traffic. Instead of time-sharing a single channel, the system uses multiple channels simultaneously, where the first channel handles registration and the second channel handles service transmission. This dimensional separation eliminates the time-sharing constraint while maintaining manageable device complexity through clear channel functional division.
Data Source
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AI summary
Embodiments of this application provide an information transmission method, an optical line termination, an optical network unit, and a communications system. A method on an optical line termination OLT side includes: allocating, by the OLT, an identifier to a first optical network unit ONU through a first channel, and performing, through the first channel, ranging on the first ONU to obtain ranging information about the first channel; and after determining, by the OLT and the ONU through negotiation, to use two channels to perform information transmission, performing, by the OLT, data transmission of a first service with the first ONU through a second channel. In this method, identifier allocation and ranging are performed through the first channel, and the data transmission of the first service is performed through the second channel. In this way, a relatively large delay is no longer generated for service data that has a relatively high requirement for delay. This further ensures normal execution of these services.