Small Base Station Access Control for Unregistered CSG Cells
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Solution Overview
Problem
Current mobile communication systems lack a defined access procedure for mobile station apparatuses to unregistered CSG cells, particularly for non-priority calls, leading to inefficiencies and increased call interruptions.
Innovation Solution
A small base station apparatus receives originated call requests with user identifiers and priority information, determining whether to permit the call based on registration and priority, and transfers requests to a preliminarily defined base station if unregistered, ensuring appropriate access and reducing call interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a mobile station apparatus tries to access a CSG cell without distinguishing it as registered or unregistered, then it may waste power consumption and radio resources, but it cannot establish efficient access procedures for unregistered devices
Solution Approach 1:
The patent segments the CSG cell access procedure into distinct paths based on registration status. Mobile station apparatuses are divided into two groups: those with registration information that can directly access registered CSG cells, and those without registration information that follow a different procedure involving macro cell assistance. This segmentation allows each group to follow an optimized access path, reducing unnecessary power consumption and radio resource waste while providing appropriate access procedures for unregistered devices.
Solution Approach 2:
The patent introduces a macro cell as an intermediary for unregistered mobile station apparatuses. When a mobile station without registration information encounters a CSG cell, it cannot access it directly. Instead, it camps on a macro cell which then provides assistance information (such as CSG cell identifiers and access conditions) to enable the mobile station to properly access the CSG cell. This intermediary mechanism resolves the access procedure gap for unregistered devices while preventing resource waste from inappropriate access attempts.
2Reliability
If CSG cells restrict access by requiring preliminary user registration, then security and resource management are improved, but unregistered mobile station apparatuses cannot access even priority calls
Solution Approach 1:
The patent applies different access control qualities to different mobile station apparatuses based on their registration status. Registered mobile stations receive full access rights including priority calls, while unregistered mobile stations receive limited access rights that still permit priority calls under specific conditions. The macro cell provides localized assistance information that enables unregistered devices to access priority CSG cells when necessary, creating a differentiated but flexible access control system that maintains security while adapting to various call types.
Solution Approach 2:
The patent introduces dynamic access control where the ability to access CSG cells changes based on the type of call being made. For unregistered mobile station apparatuses, normal calls are blocked from CSG cells, but priority calls are permitted when the mobile station camps on a macro cell and receives appropriate assistance information. This dynamic approach allows the system to adapt access rights in real-time based on call priority, maintaining security for routine access while enabling critical communications.
3Adaptability or versatility
If mobile station apparatuses camp on macro cells to access unregistered CSG cells, then access flexibility is improved, but call interruption risk increases without proper assistance information
Solution Approach 1:
The patent implements preliminary action by having the macro cell provide assistance information to mobile station apparatuses before they attempt to access CSG cells. When a mobile station camps on a macro cell, the macro cell proactively supplies CSG cell identifiers, access conditions, and other relevant information. This preliminary provision of information enables the mobile station to make informed decisions about CSG cell access, reducing the risk of call interruptions by avoiding failed access attempts and ensuring proper handover procedures are followed.
Data Source
AI summary
A mobile station apparatus receives an indication and access restriction information, where the indication indicating whether the cell is a Closed Subscriber Group (CSG) cell, where the CSG cell configured to restrict an access of the mobile station apparatus that are not being registered, and where the access restriction information indicating an access restriction related to an emergency call. The mobile station apparatus also transmits a connection request message for the emergency call based on the access restriction information, where the cell on which the mobile station apparatus camped being the CSG cell and where the mobile station apparatus not registering the cell.