CSG Membership Verification in Wireless Handover
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Solution Overview
Problem
There is a need to improve the quality of Closed Subscriber Group (CSG) services in wireless communication systems, which are often provided at higher costs and require effective management of CSG subscription information to ensure accurate access control and handover processes.
Innovation Solution
A method and apparatus that enables user equipment to receive CSG subscription requests, determine CSG membership based on a whitelist, and report CSG subscription information to the serving cell, including the CSG identity and membership indicator, to facilitate accurate handovers and access control in a wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSG services are provided to improve quality of service, then service quality is improved, but service cost increases
Solution Approach 1:
The system performs preliminary verification of CSG membership status before allowing handover to CSG cells. The UE reports its CSG membership information in advance during the handover process, allowing the network to pre-validate access rights and avoid unnecessary resource allocation for unauthorized users, thereby reducing wasted service costs while maintaining quality service for legitimate CSG members
2Measurement precision
If CSG membership verification is performed to ensure accurate access control, then access control accuracy is improved, but handover process complexity increases
Solution Approach 1:
The patent extracts the CSG membership verification process as a separate, standardized step within the handover procedure. The UE independently determines its CSG membership status based on pre-stored whitelist information and reports this status to the serving cell through a dedicated message. This extraction simplifies the overall handover process by isolating the verification logic, making it easier to manage and implement without significantly increasing overall system complexity
Solution Approach 2:
The user equipment performs self-verification of CSG membership status using its own stored whitelist information before reporting to the network. The UE autonomously determines whether it is a member of the target CSG cell based on comparing the target cell's CSG ID with its stored whitelist, reducing the burden on the network side and simplifying the verification process while maintaining high accuracy
3Measurement precision
If CSG subscription information is reported to facilitate handover, then handover accuracy is improved, but signaling overhead increases
Solution Approach 1:
The system implements partial reporting of CSG subscription information - the UE reports only the essential CSG membership status indicator and relevant CSG IDs that are necessary for handover decision-making. This partial action approach provides sufficient information for accurate handover while avoiding the transmission of redundant or excessive signaling data, thereby balancing handover accuracy with signaling overhead reduction
Data Source
AI summary
A method and apparatus for supporting a closed subscriber group (CSG) service is provided. A user equipment determines whether a neighbor cell is a CSG member cell for which a CSG whitelist includes a CSG identity of the neighbor cell and PLMN identities of the neighbor cell. The user equipment sends a CSG membership indicator indicating whether the neighbor cell is the CSG member cell.