Non-Public Cellular Network Search Using SIM-Stored Frequency Data

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Solution Overview

Problem

Existing technologies do not efficiently enable user equipment to detect and access non-public cellular networks, hindering seamless use of such networks.

Innovation Solution

A communication control method where a user equipment uses a SIM to store network identifiers and frequency information for non-public cellular networks, and performs search processing based on this information, and a base station broadcasts NPN information to assist the user equipment in identifying and accessing these networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If user equipment performs general cell search processing without specific NPN information, then it can detect public cellular networks, but it cannot efficiently detect and access non-public cellular networks

Engineering Contradiction:

Improvedetection efficiency of non-public cellular networkVSAvoidnetwork identifier and frequency information of non-public cellular network

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The network identifier and frequency information of the non-public cellular network are stored in advance in the SIM card of the user equipment. This preliminary storage of critical information enables the UE to perform targeted search processing specifically for NPNs, significantly improving detection efficiency compared to general cell search methods

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The base station acts as an intermediary by broadcasting NPN information (network identifier, frequency information, or cell identifier) to user equipment. This broadcast information serves as a mediator that enables UEs to efficiently locate and access non-public networks without performing exhaustive searches

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If user equipment ranks all detected cells without distinction, then it maintains comprehensive cell selection capability, but it cannot prioritize access to authorized non-public cellular networks

Engineering Contradiction:

Improveaccess priority to non-public cellular networkVSAvoidcell selection and ranking logic

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The cell ranking logic is enhanced with local quality differentiation by identifying whether detected cells belong to authorized non-public networks using the network identifier stored in the SIM. This localized identification enables preferential treatment of NPN cells in the ranking process, ensuring authorized networks receive priority access while maintaining standard procedures for other cells

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12375919B2Communication control method for communicating with public and non-public cellular networks

Publication Date: 2025.07.29 KYOCERA CORP

AI summary

A network identifier for identifying a non-public cellular network allowed to be accessed from a user equipment and frequency information indicating a frequency of the non-public cellular network are stored in a SIM. The user equipment performs search processing for the non-public cellular network in accordance with the network identifier and the frequency information stored in the SIM.