Femtocell CSG Access Control Across Multiple PLMNs
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Solution Overview
Problem
Current cellular network systems lack the ability to provide fine-grained control over Closed Subscriber Group (CSG) access, particularly when multiple Public Land Mobile Networks (PLMNs) are involved, leading to limitations in managing UE access based on CSG IDs and modes.
Innovation Solution
Implementing a CSG access device that can issue multiple CSG IDs and modes specific to different PLMNs, allowing for differentiated access control by broadcasting customized System Information Block Type 1 (SIB1) messages, and verifying UE membership through core network interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a CSG access device supports only a single CSG ID and mode, then the device complexity is reduced, but the adaptability to different PLMNs and fine-grained access control is limited
Solution Approach 1:
The patent segments the access control mechanism by introducing multiple CSG IDs and associating each CSG ID with specific PLMNs and access modes. Instead of a single monolithic CSG configuration, the system divides access control into multiple independent CSG groups, each capable of being associated with different PLMNs and having distinct access modes (open, closed, hybrid), thereby enabling fine-grained control over UE access to different networks
Solution Approach 2:
The patent adds a new dimension to the access control system by introducing PLMN-specific CSG associations. Rather than a flat single CSG ID structure, the system creates a multi-dimensional framework where CSG IDs are linked to specific PLMNs and access modes, allowing UEs to have different access permissions across different network operators and enabling precise control over which UEs can access which PLMNs through the femtocell
2Manufacturing precision
If CSG access control is implemented without PLMN-specific CSG IDs, then the system operation is simpler, but the precision of access management is insufficient
Solution Approach 1:
The patent applies local quality by allowing different CSG IDs to have different access modes and PLMN associations tailored to specific local requirements. Each CSG ID can be configured with specific properties (access mode, associated PLMNs) that are optimized for particular scenarios, such as allowing open access for home networks while implementing closed access for enterprise networks, thereby enabling precise local customization of access control policies
3Reliability
If multiple CSG IDs and PLMN-specific access modes are implemented, then fine-grained access control is achieved, but the information processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring and broadcasting the list of supported CSG IDs and their associated PLMNs and access modes in SIB1 messages before UEs attempt to access the network. This advance publication of access control parameters allows UEs to perform local matching against their subscription information without requiring complex real-time negotiations, thereby reducing information exchange overhead and simplifying the access control process
Data Source
AI summary
A femtocell may include a processor. The processor may be configured to: receive Public Land Mobile Network (PLMN) identifiers (IDs) that identify PLMNs; receive, for each of the first PLMN IDs, a unique Closed Subscriber Group (CSG) ID; and broadcast the PLMN IDs and, for each of the PLMN IDs, the unique CSG ID.