PON ONU Registration Without SN Discovery Windows

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Solution Overview

Problem

The registration process in optical communication networks, particularly in passive optical networks (PON), causes significant upstream delay jitter due to the periodic opening of serial number (SN) discovery windows, leading to service interruptions and inefficiencies.

Innovation Solution

A method where network devices prestore serial numbers (SNs) of devices going online, allowing for the allocation of registration identifiers without opening SN discovery windows, thereby reducing delay jitter and service interruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the OLT periodically opens SN discovery windows for ONU registration, then new ONUs can be registered and discovered, but upstream delay jitter increases and service interruption occurs

Engineering Contradiction:

ImproveONU registration capabilityVSAvoidupstream delay jitter

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The OLT prestores the SNs of ONUs that are to go online before they actually attempt to register. When an ONU sends a ranging packet, the OLT can immediately match it against the prestored SNs and allocate a registration identifier without needing to open an SN discovery window, thereby eliminating the periodic interruption and delay jitter while maintaining registration capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the SN discovery function from the periodic SN discovery window mechanism. Instead of using a periodic window-based discovery approach that interrupts upstream transmission, the system uses a prestored SN list that allows continuous upstream transmission while still enabling new ONU registration through direct matching against the prestored information

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If the OLT opens SN discovery windows periodically for ONU registration, then new ONUs can be allocated registration identifiers, but service of other ONUs is interrupted

Engineering Contradiction:

ImproveONU registration capabilityVSAvoidnetwork service efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables continuous upstream transmission by removing the periodic SN discovery window interruptions. The prestored SN list allows the OLT to continuously process ONU registration requests without stopping upstream transmission, thereby maintaining continuous network service for all ONUs while still enabling new registrations

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentEP4723667A1Optical communication network registration method and apparatus, network device, and system

Publication Date: 2026.04.08 HUAWEI TECH CO LTD

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AI summary

A registration method for an optical communication network, an apparatus, a network device, and a system are disclosed, and the disclosure relates to the field of optical communication technologies. Regardless of whether a sub ONU goes online for the first time or goes online again, a main ONU allocates a registration identifier (ONU ID) to the sub ONU based on prestored SNs of sub ONUs that are to go online. To be specific, the main ONU does not need to open an SN discovery window for the ONU that is to go online, and does not need to interrupt a service of another sub ONU that communicates with the main ONU, implementing registration of the sub ONU with the optical communication network without opening a quiet window, and reducing delay jitter of the optical communication network caused by a registration process of the sub ONU.