LTE-Advanced CSG Cell Access Control via Dual Membership Lists
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Solution Overview
Problem
Current CSG control mechanisms in LTE-Advanced systems cannot restrict the use of a CSG cell as a secondary cell by non-member mobile stations, leading to potential unauthorized use of CSG cells.
Innovation Solution
Implementing a network management system that maintains separate lists for primary and secondary cell connections, where mobile stations notify the network of their membership status in these lists, allowing the network to determine and enforce appropriate cell configurations based on these indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSG control is implemented to restrict connection to CSG cells as Pcell, then security and access control are improved, but the system cannot restrict use of CSG cell as Scell by non-member mobile stations
Solution Approach 1:
The patent segments the access control mechanism into two distinct lists: a first list for Pcell connection authorization and a second list for Scell configuration authorization. This segmentation allows the system to independently control primary cell connection rights while separately managing secondary cell configuration rights, thereby resolving the contradiction between security and flexibility.
Solution Approach 2:
The patent applies different access control policies to different cell roles. Member mobile stations are granted both Pcell connection rights and Scell configuration rights, while non-member stations are granted only Scell configuration rights under specific conditions. This local differentiation of access permissions enables tailored control for each cell usage scenario.
2Ease of operation
If a mobile station not in the CSG member list connects to a CSG cell as Pcell, then connection establishment is simplified, but unauthorized use of CSG cell occurs
Solution Approach 1:
The patent performs preliminary verification by checking whether the mobile station is in the first list before allowing Pcell connection. This preliminary action ensures that only authorized member stations can establish connections to CSG cells as primary cells, preventing unauthorized access while maintaining streamlined connection procedures for legitimate users.
3Productivity
If CSG cell is made available as Scell to all mobile stations, then network resource utilization is improved, but non-CSG members can use CSG cell resources
Solution Approach 1:
The patent creates a separate second list specifically for Scell configuration authorization, distinct from the first list for Pcell connection. This allows non-member mobile stations to be added to the second list and configured to use CSG cells as Scell while maintaining security restrictions on Pcell connection, thereby enabling resource utilization without compromising security.
Solution Approach 2:
The patent applies differentiated permission levels: member stations receive full access rights for both Pcell and Scell, while non-member stations receive limited rights restricted to Scell configuration only. This local quality approach allows selective resource sharing while preserving security boundaries.
Data Source
AI summary
An objective is to avoid a situation where a mobile station UE, which is not a CSG member, uses a CSG cell as an Scell in CSG control. A radio base station eNB according to the invention includes a management unit 12 configured to manage at least one of a Pcell list and an Scell list, a reception unit 11 configured to acquire at least one of Pcell member information and Scell member information from a mobile station UE in a cell #10, and a control unit 13 configured to determine whether or not the mobile station UE can connect to the cell #10 as a Pcell and determine whether or not the mobile station UE can configure the cell #10 as an Scell by referring to the management unit 12 based on at least one of the Pcell member information and the Scell member information.