Dual SIM Voltage Control via Dynamic Detection
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Solution Overview
Problem
Dual SIM mobile phones often malfunction when the operating voltages of installed SIM or USIM cards differ from the driving voltage level, leading to operational issues.
Innovation Solution
A method for initiating and managing operating voltages of multiple subscriber identity cards using a dual SIM controller, Baseband unit, and RF module, which detects and sets appropriate voltage levels for each card to ensure compatibility and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed voltage level is used to drive both SIM cards, then the device structure is simple, but the SIM cards malfunction when their operating voltages differ from the driving voltage level
Solution Approach 1:
The patent implements dynamic voltage control by detecting the operating voltage requirements of each SIM card and adjusting the driving voltage accordingly. The controller switches between different voltage levels (1.8V or 3.0V) based on the detected SIM card type, transforming the static fixed-voltage system into a dynamic adaptive system that resolves the contradiction between structural simplicity and operational reliability.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on SIM card detection results. The controller detects whether a SIM card requires 1.8V or 3.0V operation and adjusts the driving voltage parameter correspondingly, ensuring each SIM card operates at its required voltage level while maintaining a relatively simple overall system structure.
2Reliability
If separate voltage control circuits are added for each SIM card to ensure proper operation, then SIM card reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage control functions for both SIM cards into a single controller that can dynamically adjust voltage levels. Instead of implementing separate dedicated voltage control circuits for each SIM card, the system uses one intelligent controller that manages voltage distribution to both SIM slots, reducing overall circuit complexity while ensuring each SIM receives its required voltage.
Solution Approach 2:
The controller is designed with multi-functionality to handle both SIM cards universally. It can detect and adapt to different voltage requirements (1.8V or 3.0V) for either SIM card slot, making a single controller capable of managing multiple different operating conditions without requiring separate specialized circuits for each SIM.
3Adaptability or versatility
If voltage detection and adjustment mechanisms are implemented, then compatibility with different SIM cards is improved, but the initialization process becomes more complex
Solution Approach 1:
The patent implements preliminary voltage detection when a SIM card is first inserted into the slot. The controller detects the SIM card's operating voltage requirement (1.8V or 3.0V) during the initialization phase and configures the appropriate voltage level before normal operation begins. This preliminary action ensures compatibility without requiring complex continuous adjustment mechanisms during operation.
Data Source
AI summary
A system for initiating operating voltages for subscriber identity cards is provided. The system includes a first subscriber identity card, a second subscriber identity card, an RF module, a controller and a Baseband unit. The controller initiates a first operating voltage of the first subscriber identity card and initiates a second operating voltage of the second subscriber identity, respectively. The Baseband unit cooperates with the first subscriber identity card to camp on a first cell and cooperates with the second subscriber identity card to camp on a second cell via the RF module.