User Equipment CSG List Management via Location Area Updates
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Solution Overview
Problem
Current mobile communication systems face high costs and increased signaling load when managing Closed Subscriber Group (CSG) and Prioritized Subscriber Group (PSG) lists, requiring massive modifications to core network nodes, which is not suitable for legacy systems like UMTS and GSM EDGE Radio Access Network (GERAN).
Innovation Solution
A method and apparatus that allow user equipment to manually manage CSG and PSG lists using existing network signaling, adding or deleting entries based on manual user input and network responses, without requiring significant modifications to core network nodes or increasing signaling load, thereby reducing network upgrade costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automated management of CSG and PSG lists is implemented in core network nodes, then list management accuracy and reliability are improved, but device complexity and network upgrade costs increase significantly
Solution Approach 1:
The terminal device autonomously manages CSG and PSG lists by receiving access information from the network, determining whether to add or delete entries based on success/failure of location area updates, and maintaining the lists without core network node intervention. This self-service mechanism eliminates the need for complex automated management in core network nodes while ensuring accurate list management.
Solution Approach 2:
The list management function is extracted from the core network nodes and relocated to the terminal device. By taking out this function, the complexity and upgrade costs of core network nodes are reduced, while the terminal device assumes responsibility for maintaining accurate CSG and PSG lists based on network responses.
2Adaptability or versatility
If automated CSG list management is implemented, then service accessibility is improved, but signaling load and network cost increase
Solution Approach 1:
Instead of continuous automated management signaling, the system uses partial action by only triggering list management operations when location area updates occur. The terminal device receives access information sporadically and performs selective add/delete operations, reducing overall signaling load while maintaining service accessibility when needed.
Solution Approach 2:
The terminal device autonomously updates CSG and PSG lists based on location area update outcomes without requiring additional network signaling for list management. This self-service approach reduces signaling load compared to automated network-managed solutions while ensuring terminals can access services in appropriate networks.
3Ease of operation
If manual management of CSG lists is allowed, then ease of operation is improved, but reliability and automation level decrease
Solution Approach 1:
The system provides feedback to the user by notifying them when a location area update succeeds or fails. Based on this feedback, the terminal automatically determines whether to add or delete CSG/PSG entries. This feedback mechanism combines user awareness with automated decision-making, maintaining reliability while keeping users informed and able to understand system actions.
Solution Approach 2:
The terminal device performs preliminary actions by automatically adding or deleting CSG/PSG list entries based on location area update outcomes before the user needs to access services. This preliminary automation ensures the lists are already optimized when service access is attempted, combining automated reliability with user-friendly operation.
Data Source
Figure 1~2b
Figure 2c~4
Figure 5
AI summary
List management including storage and management of a CSG/PSG list by a user equipment is disclosed.