Dynamic Access Control for Home Cell Base Stations
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Solution Overview
Problem
In wireless communication systems using the closed access method, mobile stations cannot access a home cell base station assigned with a CSG ID not included in their CSG list, preventing membership offers to such stations, and existing methods fail to efficiently manage group memberships.
Innovation Solution
An access control method that dynamically changes between closed, hybrid, and open access control methods based on subscription requests, completion reports, and predetermined periods to ensure reliable group membership offerings, allowing mobile stations to access the base station even if they are not initially subscribed to the CSG, and periodically updates memberships to prevent unused group memberships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closed access method is used to ensure security and controlled access to the home cell base station, then unauthorized access is prevented, but mobile stations cannot access the base station if their CSG ID is not in the allowed list, preventing membership offers to new users
Solution Approach 1:
The access control method is made dynamic by allowing the base station to switch between closed access method and hybrid access method based on operational needs. When membership offers are required, the system temporarily transitions to hybrid access method, enabling mobile stations without pre-configured CSG IDs to access the base station and receive membership offers. After successful membership addition, the system returns to closed access method to maintain security. This dynamic adjustment resolves the contradiction between maintaining strict access control and enabling flexible membership expansion.
Solution Approach 2:
The system changes the access control parameter from exclusively 'closed access method' to a configurable state that can be 'closed access method' or 'hybrid access method'. By modifying this parameter based on whether membership offers are needed, the system can simultaneously maintain security (when using closed access) and enable membership offers (when using hybrid access), thus resolving the technical contradiction between these two requirements.
2Adaptability or versatility
If the hybrid access method is used to allow any mobile station to access the home cell base station for membership offers, then membership expansion is enabled, but unauthorized access and security control are compromised
Solution Approach 1:
The system dynamically adjusts the access control method based on the operational phase. During membership offer phases, hybrid access method is activated to allow broad access. During normal operation phases, closed access method is enforced to maintain security. This temporal separation of access control strictness resolves the contradiction between enabling membership offers and maintaining security.
Solution Approach 2:
The system periodically switches between closed access method and hybrid access method in a controlled manner. It transitions to hybrid access method when membership offers are needed, performs the membership addition, then transitions back to closed access method. This periodic switching pattern allows the system to achieve both membership expansion and security maintenance at different time intervals.
3Ease of operation
If manual CSG selection is used for membership offers without exchanging HPLMN and CSG information, then the process is simplified, but the mobile station cannot access the base station if the CSG ID is not already in its CSG list
Solution Approach 1:
The system performs preliminary action by temporarily changing the access control method to hybrid access method before the membership offer process. This preliminary change to a more permissive access mode ensures that mobile stations can access the base station even without pre-configured CSG IDs, thereby enabling the subsequent membership offer process to succeed. After the membership is added, the system returns to closed access method.
Data Source
AI summary
A first access method changer changes an access control method of a base station device to a third access control method in which a control with a first access control method and a control with a second access control method are performed simultaneously. The first access control method is such that a mobile station device subscribing to the group is allowed to access the base station device. The second access method is such that any mobile station device is allowed to access the base station device. A second access method changer changes the access control method of the base station device from the third access control method changed by the first access method changer to the first access control method.