Variable Cell Identifier for Open Network Access Control
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Solution Overview
Problem
Existing cellular mobile radio networks restrict access to closed subscriber group cells, preventing users from other networks or companies from accessing these cells without involving the home network, limiting open network access.
Innovation Solution
A method where the cell identifier of radio cells is variable, allowing temporary or permanent restriction to a closed subscriber group or enabling open network access, with specific bits indicating access restrictions or open access, enabling users from other groups to access CSG cells without home network involvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cell identifier is fixed for closed subscriber group, then access restriction is maintained, but open network access is prevented
Solution Approach 1:
The cell identifier is made variable and can be dynamically changed between different states (CSG identifier and open access identifier). This allows the cell to transition between restricted and open access modes, resolving the contradiction between maintaining access restriction reliability and enabling open network access flexibility.
Solution Approach 2:
The patent changes the parameter of cell identifier from fixed to variable. By allowing the identifier to take different values (CSG identifier for restricted access, open access identifier for public access), the system achieves both reliable access control when needed and flexible open access when required.
2Reliability
If positive list comparison is required, then access control is maintained, but access speed is reduced
Solution Approach 1:
The system performs preliminary action by pre-configuring the mobile terminal with the positive list of permitted cell identifiers before access is needed. When access is required, the terminal simply compares the current cell identifier against this pre-stored list, eliminating the need for real-time complex authentication procedures and thus maintaining both reliability and speed.
3Adaptability or versatility
If cell identifier is variable, then open network access is enabled, but identification precision is reduced
Solution Approach 1:
The patent applies local quality by using different identifier characteristics for different access scenarios. When open access is enabled, a specific identifier pattern is used that is distinct from the CSG identifier pattern. This allows the system to maintain precise identification through local differentiation while achieving overall adaptability across different access modes.
Data Source
Figure 1
Figure 2a~2b
AI summary
Method for the operation of one or more radio cells in a cellular mobile radio network and cellular mobile radio system, wherein each radio cell can be identified by a transmitted cell identifier, wherein the use can be limited to a closed subscriber group by virtue of the radio cell having an appropriate identifier and by virtue of mobile radio terminals registering in the respective radio cell for use of the services of the mobile radio network only following a positive comparison with a positive list of authorized cell identifiers which is stored in the mobile radio terminal, wherein the cell identifier is variable and it is possible to use the cell identifier to establish whether registration and use of the network services is currently limited to the closed subscriber group or whether alternatively registration and use of the network services is cleared for any subscribers.