CAG Selection in Manual Network Mode
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Solution Overview
Problem
The unclear standards for UE operations in supporting localized services in 5G NR networks lead to a need for improved access control mechanisms, particularly for closed access groups (CAGs), to prevent unauthorized access in non-public networks (NPNs).
Innovation Solution
The proposed solution involves an apparatus that supports CAGs in manual network selection mode, allowing users to detect and authorize CAG cells based on time validity information, enabling authorized access to CAG cells while preventing unauthorized access by using a CAG information list that includes PLMN IDs and time validity criteria, and attempting to camp on authorized CAG cells if the initially selected cell is not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CAG access control is implemented to prevent unauthorized access to NPNs, then network security is improved, but UE operation complexity increases due to unclear standards
Solution Approach 1:
The UE performs preliminary actions by detecting CAG cells and validating CAG IDs against the allowed CAG list before attempting access. Time validity information is checked in advance to determine if the CAG ID is currently authorized, preventing unauthorized access attempts and reducing operational complexity during actual access attempts
Solution Approach 2:
The system implements feedback mechanisms where the UE continuously monitors and validates CAG ID authorization status based on time validity information. The UE receives feedback from the network about allowed CAG lists and updates its access decisions accordingly, creating a closed-loop control system that adapts to changing authorization states
2Ease of operation
If manual network selection mode is used with CAG support, then user control over network selection is improved, but access control reliability deteriorates due to potential unauthorized selection
Solution Approach 1:
The allowed CAG list stored in the UE acts as an intermediary between user selection and network access. When a user manually selects a CAG ID, the system checks this selection against the allowed CAG list and time validity information before permitting access, mediating between user intent and access authorization to prevent unauthorized selections
Solution Approach 2:
The system performs preliminary validation of user-selected CAG IDs against the allowed CAG list and time validity criteria before allowing access. This pre-check mechanism ensures that even in manual selection mode, only authorized CAGs can be accessed, maintaining access control reliability while preserving user control
3Measurement precision
If time validity information is checked for CAG ID authorization, then access control precision is improved, but network selection time increases
Solution Approach 1:
Time validity information is checked in advance during the network selection process before access attempts are made. By performing this validation preliminarily, the system avoids wasted time on unauthorized access attempts and ensures precise access control is established before the UE commits to a network selection
Solution Approach 2:
The system performs the necessary time validity check as a partial action within the overall network selection process. Rather than adding a complete separate validation phase, the time check is integrated into the existing CAG detection and selection workflow, minimizing additional time overhead while maintaining precision
Data Source
AI summary
Various solutions for enhanced closed access group (CAG) selection in manual network selection mode are described. An apparatus may determine that the apparatus supports CAG and operates in a manual network selection mode. The apparatus may detect a CAG cell associated with a CAG identifier (ID) in an allowed CAG list. The apparatus may indicate to a user whether the CAG ID is authorized based on time validity information associated with the CAG ID in the allowed CAG list.