Closed Subscriber Group Access Control via Dynamic Indicator Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing access control for closed subscriber groups (CSGs) in visited networks, particularly in determining device membership and providing appropriate access levels to restricted group nodes, which can lead to inconsistent user experiences and security issues.
Innovation Solution
The system communicates indicators to determine device membership in restricted groups on a visited network, allowing nodes to request subscription information from home or visited network servers, and enables users to manually select accessible CSGs, ensuring secure and controlled access by maintaining both operator and user lists of allowed CSGs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system automatically determines device membership in CSGs without manual selection, then access control is simplified and user experience is improved, but security control and precision in membership determination deteriorate
Solution Approach 1:
The system dynamically adjusts the level of access control between automatic and manual modes based on network conditions and user requirements. The eNodeB can switch between autonomous CSG selection and manual user selection, allowing the system to adapt to different operational contexts and balance between ease of use and security precision.
Solution Approach 2:
The system performs preliminary actions by pre-configuring CSG membership information and access control parameters before the actual access decision. The HSS/HLR provides pre-stored CSG subscription information, and the eNodeB pre-evaluates device eligibility, enabling both automatic and manual selection mechanisms to function effectively.
2Reliability
If the system maintains separate operator and user lists of allowed CSGs, then security and control precision are improved, but system complexity increases
Solution Approach 1:
The access control system is segmented into multiple functional components: the HSS/HLR maintains operator-level CSG subscription information, the CSS maintains user-level CSG lists, and the eNodeB performs local access control decisions. This segmentation allows each component to manage its specific list independently, improving security while distributing complexity across the network architecture.
Solution Approach 2:
The eNodeB acts as an intermediary between the user equipment and the CSG nodes, performing local access control decisions based on information from both operator and user lists. This intermediary role allows the system to maintain separate lists for security while the eNodeB simplifies the overall access control process through centralized local decision-making.
3Measurement precision
If the system requests CSG subscription information from HSS/HLR for every device, then membership determination accuracy is improved, but network traffic and processing time increase
Solution Approach 1:
The HSS/HLR performs preliminary action by pre-storing and pre-processing CSG subscription information for devices during the initial registration process. This preliminary preparation allows the eNodeB to access accurate membership information quickly without requiring complex real-time queries, reducing processing time while maintaining accuracy.
Solution Approach 2:
The system implements feedback mechanisms where the eNodeB receives CSG subscription information from the HSS/HLR and uses this feedback to make local access control decisions. The feedback loop allows for efficient information exchange, enabling accurate membership determination without repeated time-consuming queries, as the information is cached and updated as needed.
Data Source
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AI summary
Methods and apparatuses are provided that facilitate controlling device access to one or more restricted groups of access points in a visited network. An indicator can be provided by a home network that specifies whether a device registering with a visited network is allowed to access restricted groups in the visited networks. If so, the visited network can request restricted group subscription information for the device. Additionally or alternatively, the device can control whether restricted groups are displayed for selecting access points based on one or more indicators regarding whether the device is allowed to access restricted groups in visited networks.