Manual CAG Network Selection With UE Registration Update
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Solution Overview
Problem
User Equipment (UE) faces challenges in discovering, selecting, and accessing Non-Public Networks (NPNs) that provide localized services due to discrepancies between UE-stored and network-maintained Closed Access Group (CAG) configurations, leading to unsuitable cell selection and registration issues.
Innovation Solution
A method for enhanced manual network selection procedure allows UE to manually select CAG cells by checking their validity against stored configurations and triggering registration updates to ensure compatibility with network-maintained criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If UE manually selects CAG cell based on stored configuration, then network selection speed is improved, but configuration accuracy deteriorates due to discrepancies between UE-stored and network-maintained configurations
Solution Approach 1:
The UE performs preliminary validation by checking whether validity criteria (time, location, frequency) are satisfied before manual network selection. This preliminary check ensures that the stored CAG configuration is still valid and matches current network conditions, resolving the contradiction by maintaining both selection speed and configuration accuracy through pre-validation.
Solution Approach 2:
The system implements feedback mechanisms where the network provides updates to CAG configurations and validity criteria to the UE. This feedback loop ensures that the UE's stored configuration remains synchronized with the network-maintained configuration, eliminating discrepancies while preserving manual selection capability and speed.
2Reliability
If UE triggers registration update frequently to ensure configuration accuracy, then configuration reliability is improved, but signaling overhead increases
Solution Approach 1:
Instead of triggering full registration updates frequently, the UE performs partial validation checks on specific validity criteria (time, location, frequency) only when needed. This partial action approach maintains configuration reliability by validating only necessary parameters while significantly reducing signaling overhead compared to complete registration updates.
Solution Approach 2:
The system changes from frequent full registration updates to selective validation of specific parameters (validity criteria). By monitoring and validating only the relevant parameters that may change (time, location, frequency) rather than all configuration parameters, the system maintains reliability while minimizing signaling overhead and energy consumption.
Data Source
AI summary
A method of enhanced manual network selection procedure for access localized services in PNI-NPN is proposed. For manual CAG/PNI-NPN selection as hosting network, if a CAG cell in a PLMN broadcasting a CAG-ID is available and included in the (Allowed) CAG-ID list of the UE-stored CAG related configuration of the PLMN, the user may manually select the CAG cell as a suitable cell. However, the CAG-ID that is associated with validity information, and the corresponding validity criteria may or may not be satisfied, e.g., due to the UE-stored CAG related configuration is different from the NW-maintained CAG related configuration. Therefore, the UE does not know whether the CAG cell is suitable. In response, the UE triggers a registration procedure for mobility and periodic registration update, and obtains the updated CAG related configuration.