CSG Membership Verification for Carrier Aggregation
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Solution Overview
Problem
In mobile telecommunication networks, particularly those operating under 3GPP standards, there are challenges with managing access control and charging structures for user equipment connected to primary and secondary cells with different closed subscriber groups (CSGs), including efficient handover procedures and handling CSG subscription expiry, which current technologies do not adequately address.
Innovation Solution
The implementation of communication apparatus and methods that verify CSG membership status for user equipment across multiple cells, manage access control and charging assessments, and facilitate efficient handovers by checking CSG membership and charging structures, ensuring proper access and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation is implemented with multiple cells having different CSG configurations, then network flexibility and service differentiation are improved, but access control complexity and membership verification overhead increase
Solution Approach 1:
The system performs preliminary CSG membership verification before allowing carrier aggregation configuration. The source eNodeB verifies the UE's CSG membership status for the target cell's CSG ID before initiating handover, preventing unauthorized access attempts and simplifying the target eNodeB's access control burden.
Solution Approach 2:
The source eNodeB acts as an intermediary that coordinates CSG membership verification between the UE and target eNodeB. It collects CSG ID information, verifies membership status, and only permits aggregation configuration when verification succeeds, thereby managing access control complexity centrally.
2Reliability
If CSG membership verification is performed for each secondary cell addition, then access control reliability is improved, but handover procedure duration increases
Solution Approach 1:
CSG membership verification is performed preliminarily during the handover preparation phase rather than during secondary cell addition. The source eNodeB verifies membership status before configuring carrier aggregation, so subsequent SCell additions inherit the verified status without repeated verification delays.
Solution Approach 2:
The patent merges CSG membership verification with the existing handover procedure. The verification is integrated into the handover preparation and execution steps, combining access control validation with connection management operations to avoid separate verification overhead.
3Measurement precision
If multiple CSG IDs are tracked and managed for carrier aggregation, then charging assessment accuracy is improved, but information management complexity increases
Solution Approach 1:
The patent extracts and processes only the essential CSG ID information needed for charging assessment. The source eNodeB identifies and tracks the PCell CSG ID and SCell CSG ID separately, extracting only the relevant identifiers and membership statuses required for accurate charging without managing unnecessary detailed information.
Solution Approach 2:
The system changes the representation of CSG information from detailed cell configuration data to simplified CSG ID parameters and membership status flags. This parameter transformation reduces information management complexity while preserving the essential data needed for charging assessment accuracy.
Data Source
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AI summary
A communication system is presented in which a base station operates a each of a plurality of cells using a respective component carrier. When the base station decides to configure a mobile telephone to use additional cells of the plurality of cells, a access control procedure is initiated to determine for each cell whether the configuration should be allowed.