Gateway Apparatus Emergency Call Identification in Mobile Networks
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Solution Overview
Problem
In mobile communication systems, unauthorized mobile stations can access femto base stations by misrepresenting calls as emergency calls, leading to unauthorized use and billing issues, as the core network and gateway cannot accurately determine the type of call originated by the mobile station.
Innovation Solution
The solution involves modifying the RANAP protocol messages to include an Emergency Cause parameter, allowing the core network and gateway to identify emergency calls and perform appropriate access regulation, thereby preventing unauthorized access and ensuring accurate billing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If access regulation is skipped for emergency calls, then emergency services can access the network, but unauthorized mobile stations can misrepresent calls as emergency calls to gain unauthorized access
Solution Approach 1:
The patent introduces a gateway device as an intermediary between the mobile station and the core network. This gateway device specifically checks whether the call is actually an emergency call before allowing access regulation to be skipped, thereby preventing unauthorized stations from misrepresenting calls as emergency calls while still allowing legitimate emergency services to access the network
Solution Approach 2:
The gateway device performs preliminary verification of the call type before the access regulation decision is made. By checking in advance whether the call is genuinely an emergency call, the system can appropriately apply access regulation or exemption, preventing fraud while maintaining emergency service accessibility
2Measurement precision
If the core network checks call type, then accurate billing and access control can be achieved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts the call type verification function from the core network and places it in the gateway device. This separation reduces the processing complexity and signaling overhead in the core network, while still achieving accurate call type identification and billing control at the gateway level
Data Source
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AI summary
A mobile communication system of the present invention includes: a mobile station; a base station wirelessly communicating with the mobile station; and a gateway apparatus connected to the base station and a core network. The base station includes: first transmission means for transmitting a registration message for registering the mobile station in the gateway apparatus; and second transmission means for transmitting a message pertaining to establishment of an emergency call originated by the mobile station. The gateway apparatus includes: first reception means for receiving the registration message from the base station; second reception means for receiving an establishment message pertaining to establishment of the emergency call from the base station; and check means for checking consistency between the registration message and the establishment message.