ONU Registration Without Silent Windows in Passive Optical Networks
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Solution Overview
Problem
The registration process of optical network units (ONUs) in passive optical networks often results in delays due to the need for silent windows to avoid conflicts in uplink information, which is not suitable for applications with strict transmission delay requirements like mobile fronthaul, mobile backhaul, and high-definition video traffic.
Innovation Solution
The optical line terminal (OLT) pre-acquires registration information for the ONU before the registration process, allowing it to directly issue configuration information without receiving additional information from the ONU, thereby eliminating the need for silent windows and reducing the amount of transmitted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional registration process is used where the OLT receives information from the ONU, then the registration is more reliable and complete, but the registration time increases and delay occurs due to the need for silent windows
Solution Approach 1:
The OLT pre-acquires registration information (such as ONU identity, serial number, and other parameters) before the actual registration process begins. This preliminary acquisition eliminates the need for the ONU to send information during registration, thereby removing the requirement for silent windows and significantly reducing registration time while maintaining complete registration data
2Reliability
If silent windows are opened during registration to avoid conflicts, then information transmission reliability is improved, but system productivity decreases due to blocked traffic channels
Solution Approach 1:
The patent extracts the information transmission function from the registration process. By having the OLT pre-acquire all necessary registration information before registration begins, the actual registration process only involves the OLT issuing configuration information to the ONU without any uplink information transmission from the ONU, thereby eliminating the need for silent windows and avoiding impact on system throughput
3Measurement precision
If multiple messages are exchanged during registration (identity request, ranging request, etc.), then registration accuracy is improved, but the number of transmission steps increases causing more delay
Solution Approach 1:
All information gathering steps are performed in advance by the OLT before registration. The pre-acquired registration information includes identity, serial number, and other parameters that would normally require multiple message exchanges. This preliminary action reduces the registration process to a single step of issuing configuration information, eliminating registration delay while maintaining accuracy
Solution Approach 2:
The OLT creates a copy of the registration information in advance during the pre-acquisition phase. This copied information is then used during the actual registration process, eliminating the need for real-time information exchange and multiple transmission steps, thereby reducing delay while maintaining registration accuracy
Data Source
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AI summary
Provided is a method for registering an optical network unit. The method is used for an optical line terminal. The method for registering an optical network unit comprises: according to pre-acquired registration information of an optical network unit to be registered, issuing registration configuration information, so as to complete registration of said optical network unit, wherein the registration information of said optical network unit is acquired before the present registration starts. Further provided are a method for writing registration information, an optical line terminal, an optical network unit, a front-facing optical network unit, and a registration device.