UE Registration for Localized NPN Service Access via AMF

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Solution Overview

Problem

Existing terminals subscribed to a public land mobile network (PLMN) face difficulties in seamlessly accessing Non-Public Network (NPN) services without undergoing a separate subscription procedure, particularly in specific areas like buildings or stadiums.

Innovation Solution

The system enables user equipment (UE) to obtain localized service information from the Access and Mobility Management Function (AMF) of the serving network, allowing direct communication and acquisition of Local Area Data Network (LADN) information without a separate NPN subscription process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal performs a separate NPN subscription procedure to access NPN services, then service security and network management are improved, but service access time and user convenience deteriorate

Engineering Contradiction:

Improveservice securityVSAvoidservice access time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The terminal performs NPN subscription procedures in advance before actually needing to access NPN services. The subscription information is stored and validated when the terminal enters an NPN service area, allowing immediate service access without performing the subscription procedure at the moment of service request. This resolves the contradiction by preparing the subscription status beforehand while maintaining security requirements.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the terminal performs a separate NPN subscription procedure, then network authorization control is improved, but service availability and ease of use deteriorate

Engineering Contradiction:

Improvenetwork authorization controlVSAvoidservice availability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent combines the NPN subscription procedure with the existing PLMN service registration process. When the terminal registers with the PLMN network, it simultaneously performs NPN subscription validation for supported NPNs. This merging eliminates the need for a separate NPN subscription procedure, maintaining network authorization control while significantly improving service availability and ease of use.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the terminal requires separate NPN subscription, then network management complexity is reduced, but service deployment flexibility deteriorates

Engineering Contradiction:

Improvenetwork management complexityVSAvoidservice deployment flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent implements a universal subscription mechanism where a single PLMN subscription automatically enables access to multiple NPN services. The network configures multiple NPN support indicators in the system information, and the terminal validates its subscription status for all supported NPNs through a single procedure. This multi-functional approach reduces network management complexity while enhancing service deployment flexibility across multiple NPNs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12490219B2Communication related to localized service

Publication Date: 2025.12.02 LG ELECTRONICS INC

AI summary

One disclosure of the present specification provides a method for a UE to perform communication. The method includes transmitting a NAS request message to a first AMF; receiving a NAS response message from the first AMF; transmitting a registration request message to a second AMF; and receiving a registration acceptance message including LADN information from the second AMF.