Emergency Call SIM Switching Controller
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Solution Overview
Problem
In portable terminals with dual SIM cards, emergency calls cannot be transmitted if the selected and activated SIM card is unable to perform communication services, leading to potential delays in critical situations where the user is unaware of the terminal's inability to place a call.
Innovation Solution
A device and method that automatically switch to a different SIM card capable of performing communication services when an emergency call is generated, ensuring the call can be transmitted regardless of the user's selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the portable terminal uses a single activated SIM card for communication, then the device complexity is reduced, but the reliability of emergency call transmission deteriorates when the activated SIM card cannot perform communication services
Solution Approach 1:
The system performs preliminary identification of communication service availability for multiple SIM cards before emergency call transmission is needed. When an emergency call is generated, the controller has already prepared information about which SIM cards can perform communication services, enabling rapid switching without requiring real-time evaluation during the critical emergency moment.
Solution Approach 2:
The controller acts as an intermediary that manages the selection and switching between SIM cards. It identifies the communication service state of each SIM card and automatically switches to a capable SIM card when the activated one is unavailable, mediating between the user's original selection and the actual communication requirement during emergency situations.
2Reliability
If the portable terminal automatically switches SIM cards during emergency calls, then the reliability of emergency call transmission is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The controller pre-identifies which SIM cards are capable of performing communication services and stores this information. When an emergency call is generated, the system already has the necessary knowledge about SIM card capabilities, eliminating the need for complex real-time evaluation during the critical emergency moment and reducing the operational complexity of the switching mechanism.
Solution Approach 2:
The system performs self-service by automatically detecting the communication service state of SIM cards and autonomously switching to an appropriate SIM card without requiring user intervention. The controller monitors its own system state and takes corrective action when the activated SIM card is unable to perform communication services, simplifying the user experience while managing the complexity internally.
3Ease of operation
If the portable terminal waits for user selection and activation of SIM card, then the ease of operation is maintained, but the loss of time increases during emergency situations when the selected SIM card cannot perform communication services
Solution Approach 1:
The system performs preliminary identification of communication service availability for multiple SIM cards during normal operation. This pre-preparation ensures that when an emergency call is generated, the controller can immediately switch to a capable SIM card without requiring the user to re-select or re-activate SIM cards, thereby eliminating time loss while maintaining ease of operation.
Solution Approach 2:
The controller continuously monitors the communication service state of activated SIM cards and provides feedback about their availability. When the system detects that the activated SIM card cannot perform communication services during an emergency call attempt, it automatically initiates switching to an alternative SIM card, providing real-time feedback-driven correction that prevents time loss without complicating user interaction.
Data Source
AI summary
Disclosed is a device and a method for processing an emergency call in a portable terminal regardless of a SIM card activated by a user's selection. The device includes a plurality of SIM cards, and a controller to make a control so that a SIM card capable of performing a communication service is automatically switched and the emergency call is transmitted when an emergency call transmission is generated.