Mobile Station Access Control Barring Concealment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, especially under the Rel. 9 LTE scheme, there is a need to conceal access classes (ACs) from the MMTEL/IMS layer function while performing Service Specific Access Control (SSAC) barring, as exposing ACs poses security risks and complicates the barring process.
Innovation Solution
A mobile station is configured with an AS layer function that receives broadcast information, generates second barring information based on first barring information and ACs, and notifies the MMTEL/IMS layer function, allowing SSAC barring to be performed without exposing ACs, thereby simplifying the barring determination process and enhancing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ACs are exposed from the terminal to the laptop or user, then the MMTEL/IMS layer function can perform SSAC barring, but security is compromised
Solution Approach 1:
The patent introduces an intermediary mechanism where the AS layer function acts as a mediator between the terminal and the MMTEL/IMS layer function. The AS layer generates second barring information based on first barring information and ACs, then notifies the MMTEL/IMS layer without exposing the actual ACs. This intermediary approach enables SSAC barring functionality while maintaining security by preventing direct exposure of ACs to upper layers or external systems.
2Adaptability or versatility
If barring information is broadcast independently for different call types, then SSAC barring can be performed independently, but the system complexity increases
Solution Approach 1:
The patent segments the barring information management into distinct components: first barring information is obtained from broadcast information, second barring information is generated locally based on ACs and first barring information, and these are managed separately in different layer functions. This segmentation enables independent control of barring for different call types while managing complexity through structured information generation and notification mechanisms.
3Measurement precision
If the mobile station UE checks all ACs 11 to 15 possessed, then accurate barring determination can be made, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-generating and storing second barring information based on ACs and first barring information before actual call requests occur. The AS layer function generates and notifies the MMTEL/IMS layer function of this pre-computed information, enabling rapid barring determination without repeatedly checking all ACs during call processing, thus reducing processing time while maintaining accuracy.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
To conceal AC of a mobile station UE from an MMTEL/IMS layer function, and at the same time, perform SSAC barring in the MMTEL/IMS layer function. In the mobile station UE according to the present invention, an AS layer function 10 includes a broadcast information reception unit 11 configured to receive broadcast information, an adjustment unit 13 configured to generate second barring information (ac-BarringFactor and ac-BarringTime) based on first barring information (ac-BarringFactor and ac-BarringTime) included in the AC of the mobile station UE and the broadcast information, and a notification unit 14 configured to notify the MMTEL/IMS layer function 30 of the second barring information, and the MMTEL/IMS layer function 30 includes a determination unit 24 configured to determine whether or not it is possible to perform a call request process based on the second barring information.