SIM Card Communication Circuit for ESIM and Physical SIM Interface Sharing
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Solution Overview
Problem
The ESIM card lacks universality, making it difficult for terminal devices to seamlessly integrate with both physical SIM cards and ESIM cards without additional hardware or increased complexity.
Innovation Solution
A SIM card communication circuit design that allows an ESIM card and a physical SIM card to share a single group of SIM interfaces, enabling the terminal device to switch between the two by controlling the working statuses of different channels without adding SIM interfaces to the processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate SIM interfaces are provided for ESIM card and physical SIM card, then both cards can be supported, but the processor size and occupied area increase
Solution Approach 1:
The patent makes a single SIM interface capable of supporting both ESIM cards and physical SIM cards by controlling the working statuses of different channels. The processor can switch between connecting to the ESIM card or the physical SIM card through channel status control, eliminating the need for separate dedicated interfaces for each card type.
2Adaptability or versatility
If additional switch units are added to enable sharing of SIM interfaces, then both card types can be supported, but device complexity and costs increase
Solution Approach 1:
The patent enables the SIM interface to self-switch between ESIM and physical SIM card connections through software-controlled channel status management. The processor directly controls the connection switching without requiring external switch units, allowing the system to self-manage the interface allocation based on the inserted card type.
Data Source
AI summary
A SIM card communication circuit. The circuit includes a processor, a first level conversion apparatus, a first card slot, and an ESIM chip; both an input port of the first level conversion apparatus and the ESIM chip are connected to the processor, and an output port of the first level conversion apparatus is connected to the first card slot; and the processor is configured to: when receiving a first message, control the first level conversion apparatus to be enabled, and control the ESIM chip to be disabled, to implement a connection between the processor and a first physical SIM card in the first card slot; or the processor is configured to: when receiving a second message, control the first level conversion apparatus to be disabled, and control the ESIM chip to be enabled, to implement a connection between the processor and an ESIM card in the ESIM chip.