Dual SIM Field Device Parameter Switching for Reliable IoT Links
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Solution Overview
Problem
Industrial field devices with internally installed SIM cards are not user-adaptable for IoT connections, limiting user flexibility and control over data transmission and configuration.
Innovation Solution
A field device with an integrated first chip card and an exchangeable second chip card, where the second set of parameters can be customized by the user for establishing a connection to a cloud service, with a control unit checking for parameter completeness and correctness before selecting the appropriate set for connection setup, ensuring a fallback to the first set of parameters if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an internally installed SIM card is used in a field device, then the connection to cloud service is established, but the user cannot adapt or customize the connection parameters
Solution Approach 1:
The SIM card functionality is segmented into two separate physical entities: an integrated first SIM card for basic connectivity and a second removable SIM card for user customization. This segmentation allows the user to have control over connection parameters through the removable card while maintaining the stability of the integrated card, thus resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The control unit acts as an intermediary that manages the interaction between the two SIM cards. It automatically checks parameter completeness, validates the second SIM card's parameters, and switches between cards based on connection success. This intermediary mechanism enables user adaptability without requiring the user to directly manage complex chip card configurations.
2Adaptability or versatility
If user-defined parameters are used for connection establishment, then cost optimization and flexibility are achieved, but connection reliability may be compromised if parameters are incorrect
Solution Approach 1:
The control unit performs preliminary actions by checking the completeness and correctness of parameters on the second SIM card before attempting connection establishment. This pre-validation ensures that user-defined parameters meet necessary requirements, reducing the risk of connection failures while maintaining the flexibility of parameter customization.
Solution Approach 2:
The system provides a fallback mechanism where the first SIM card serves as a backup connection option. If the connection using user-defined parameters from the second SIM card fails, the system automatically switches to the integrated first SIM card, ensuring continuous connectivity and compensating for potential parameter errors.
3Reliability
If a fallback mechanism is implemented, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The control unit implements automatic self-service functionality by autonomously checking parameters, attempting connections with the second SIM card, detecting failures, and switching to the first SIM card without user intervention. This automation reduces the operational complexity for users while maintaining the reliability benefits of the fallback mechanism.
Data Source
AI summary
A field device having an integrated first chip card with a first set of parameters and an interface to a replaceable second chip card. The interface is arranged to receive a second set of parameters from the second chip card. The field device is arranged to establish a connection to a cloud service using the first and/or second set of parameters.