CSFB Call Barring Control in LTE Mobile Stations
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Solution Overview
Problem
LTE Release-8/9 does not support barring origination of circuit switching (CS) calls using the CSFB function, as CS calls are not classified under the PS domain but rather as CS domain, allowing mobile stations to originate CS calls despite service-specific access control.
Innovation Solution
A mobile communication system is configured to include a radio base station with a barring processor unit that transmits notifications, such as SIB2, containing 'ac-BarringForCSFB-r10' to bar CS calls using the CSFB function, and a mobile station with a barring processor unit that performs barring processing based on these notifications, allowing appropriate barring of CS call origination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSFB function is used to originate CS calls through E-UTRAN, then circuit switching call capability is enabled in LTE network, but access control for CS calls cannot be properly implemented
Solution Approach 1:
The patent segments the access control mechanism by introducing a dedicated information element 'ac-BarringForCSFB-r10' specifically for CSFB call barring, separate from existing PS domain barring parameters. This allows independent control of CS call access through SIB2 notifications, resolving the inability to implement access control for CS calls while maintaining CSFB functionality.
2Reliability
If existing PS domain barring parameters are used, then packet switching call control is maintained, but CS call origination cannot be barred
Solution Approach 1:
The patent applies local quality by introducing a specific information element 'ac-BarringForCSFB-r10' within SIB2 that targets only CSFB call barring, while leaving existing PS domain barring parameters unchanged. This localized addition enables CS call control without affecting established PS call management mechanisms.
Data Source
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AI summary
A mobile station UE according to the present invention includes a notification reception unit 21 configured to receive an SIB2 in E-UTRAN and a barring processor unit 22 configured to perform predetermined barring processing in E-UTRAN based on information elements included in the SIB2. The barring processor unit 22 is configured to perform barring processing for origination of a CS call using a CSFB function based on "ac-BarringForCSFB-r10" and "ac-BarringForMO-Data" among the information elements.