SIM Interface Multiplexing Circuit for eSIM and Physical Card Switching
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Solution Overview
Problem
The ESIM card faces challenges in technical promotion and generalization, leading to increased processor size, occupied area, and complexity in material preparation, making it difficult to integrate with existing terminal devices.
Innovation Solution
A SIM card communication circuit utilizing a switch unit to multiplex SIM interfaces, allowing both ESIM and physical SIM card communications without requiring additional processor interfaces, enabling a common layout that maintains processor size and reduces production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an ESIM card is integrated into a terminal device, then the device can support virtual SIM card functionality, but the processor size and occupied area increase
Solution Approach 1:
The switch unit is designed to multiplex the SIM interface, allowing it to serve both physical SIM card communication and ESIM card communication functions. This multi-functionality enables the processor to support ESIM capability without requiring dedicated separate interface circuits, thereby avoiding increase in processor occupied area while maintaining versatility
2Adaptability or versatility
If an ESIM card is integrated into a terminal device, then the device can support virtual SIM card functionality, but the processor complexity and material preparation difficulty increase
Solution Approach 1:
The switch unit serves multiple functions by routing signals to either the physical SIM card interface or the ESIM card interface based on control signals from the processor. This universal design allows the same processor architecture to support both physical and virtual SIM cards without increasing complexity or material preparation difficulty
Solution Approach 2:
The switch unit acts as an intermediary component between the processor and the two different card interfaces. It mediates the connection by routing signals appropriately, allowing the processor to interact with both physical SIM and ESIM cards through a unified interface without requiring the processor itself to become more complex
3Adaptability or versatility
If separate circuits are designed for physical SIM and ESIM card support, then both card types can be supported, but production cost and manufacturing difficulty increase
Solution Approach 1:
The switch unit is designed as a universal component that can route signals to either the physical SIM card or the ESIM card based on control signals from the processor. This multi-functional design allows a single processor circuit to support both card types, eliminating the need for separate dedicated circuits and thereby reducing production costs and manufacturing complexity
Data Source
AI summary
Embodiments of this application provide a SIM card communication circuit, a related apparatus, and a control method. The circuit includes a processor, a switch unit, a first card slot, and an ESIM chip. An input terminal, a first output terminal, and a second output terminal of the switch unit are respectively connected to the processor, the first card slot, and the ESIM chip. The processor is configured to control the switch unit to choose to connect to the first card slot when receiving a first message; or the processor is configured to control the switch unit to be connected to the ESIM chip when receiving a second message. In this way, multiplexing of a SIM interface is realized through the switch unit, which can realize both communication of an ESIM card and communication of a physical SIM card.