User Terminal Emergency Call Identity Storage
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Solution Overview
Problem
Unauthenticated emergency calls in telecommunications networks pose challenges as they allow anonymous hoax calls, and existing systems struggle to identify and trace the responsible users, leading to a balance between allowing genuine emergency calls and preventing malicious ones.
Innovation Solution
A user terminal with non-volatile memory stores authenticated subscriber identities, allowing these identities to be retrieved and provided during emergency calls, even without a subscriber identity module, to facilitate tracing and authentication, thereby enabling operators to differentiate between genuine and hoax calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unauthenticated emergency calls are permitted, then genuine emergency calls can be made when services are unavailable, but hoax calls become easier to place and traceability is lost
Solution Approach 1:
The terminal performs preliminary actions by storing authenticated subscriber identities in non-volatile memory before the emergency call occurs. When an unauthenticated emergency call is made, the system retrieves and provides the stored identity information to the network, enabling traceability while maintaining the ability to make emergency calls without a physical SIM card.
2Adaptability or versatility
If subscriber identity is omitted in emergency call setup, then calls can be made without UICC, but user authentication and tracing become impossible
Solution Approach 1:
The system creates a copy of the subscriber identity information and stores it in non-volatile memory outside the UICC. This copy can be retrieved and provided during emergency calls, allowing the terminal to function without a physical SIM card while still providing authentication information to the network for reliability purposes.
3Object-affected harmful factors
If network operators inhibit unauthenticated calls, then hoax calls are reduced, but genuine emergency calls from unauthenticated terminals are prevented
Solution Approach 1:
The system provides feedback to the network by retrieving and providing stored subscriber identity information during unauthenticated emergency calls. This feedback mechanism allows the network to identify and trace callers, enabling operators to detect and prevent hoax calls while still allowing genuine emergency calls to proceed.
Data Source
AI summary
A user terminal for use with a communications system. The user terminal comprises a non-volatile memory and a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module. A recording unit is provided for recording a used and authenticated subscriber identity in said non-volatile memory, while an emergency call initiation unit is configured to initiate an unauthenticated emergency call in the absence of a subscriber identity module, and to retrieve said used and authenticated subscriber identity from said non-volatile memory and to provide the retrieved subscriber identity to the communications system during the initiation.