PNI-NPN Cell Selection Using CAG Validity Criteria
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Solution Overview
Problem
Current wireless communication systems lack an effective method for a user equipment (UE) to determine suitable cells for accessing Public Network Integrated NPN (PNI-NPN) as a hosting network for localized services, particularly in terms of validity and restriction criteria such as time and location, which are not adequately addressed by existing access control mechanisms.
Innovation Solution
The method involves associating one or more allowed Closed Access Group (CAG) IDs with validity or restriction information per UE configuration, enabling the UE to check the suitability of CAG cells broadcasting these IDs based on stored validity or restriction criteria, thereby filtering out non-compliant cells during cell selection or reselection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Closed Access Groups (CAG) are used for access control in PNI-NPN, then unauthorized UEs are prevented from accessing the network, but UEs cannot automatically select suitable cells without additional validity criteria checking
Solution Approach 1:
The patent applies preliminary action by pre-configuring validity criteria (time validity, location validity, service validity) in the UE before cell selection. The UE stores these criteria in advance and automatically checks them during cell selection process, eliminating the need for additional manual verification steps while maintaining reliable access control.
Solution Approach 2:
The patent implements self-service by enabling the UE to autonomously perform validity criteria checking during cell selection. The UE independently evaluates whether a CAG cell meets the stored validity criteria (time, location, service) and makes autonomous decisions about cell selection without requiring network intervention, thereby maintaining access control reliability while simplifying operation.
2Ease of operation
If UEs can access any CAG cell broadcasting their allowed CAG-ID, then cell selection is simplified, but UEs may access cells outside their authorized time or location restrictions
Solution Approach 1:
The patent applies feedback by continuously monitoring validity criteria conditions (current time, current location, service status) and using this feedback to dynamically determine cell suitability. The UE compares real-time conditions against stored validity criteria and adjusts cell selection decisions accordingly, preventing unauthorized access while maintaining simple operation for authorized UEs.
Solution Approach 2:
The patent implements dynamics by making cell suitability determination dynamic rather than static. The UE evaluates validity criteria in real-time based on current time, location, and service conditions, allowing the set of suitable cells to change dynamically as conditions change. This prevents unauthorized access at inappropriate times or locations while maintaining ease of operation when conditions are favorable.
3Measurement precision
If validity criteria checking is performed for each CAG cell, then access control precision is improved, but the complexity of cell selection process increases
Solution Approach 1:
The patent applies segmentation by dividing the validity criteria checking into separate, independent components: time validity checking, location validity checking, and service validity checking. Each criterion is evaluated separately and contributes to the overall cell suitability determination. This modular approach improves access control precision while managing complexity by breaking down the checking process into manageable segments.
Data Source
AI summary
A method of determining suitable cell for cell selection or reselection for PNI-NPN (as hosting network) for accessing Localized services is provided. When the PNI-NPN is (a hosting network) providing access for Localized services, one or more allowed CAG IDs are associated with validity or restriction information per UE stored configuration, e.g., time and/or location validity or restriction information. The UE needs to determine whether a CAG cell broadcasting a CAG-ID is suitable by checking the validity or restriction criteria according to the validity or restriction information of the CAG-ID stored in the UE.