Dual SIM Voltage Control for Reliable Multi-Network Operation
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Solution Overview
Problem
Dual SIM mobile phones face malfunctions when the operating voltages of installed SIM or USIM cards differ from the driving voltage level, leading to inconsistent performance across different communication services.
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 adjusts voltage levels for each card to match their specific requirements, allowing simultaneous operation on different network cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed voltage level is used to drive both SIM cards, then the device complexity is reduced, but the reliability deteriorates when SIM cards have different operating voltage requirements
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 system transitions from a static fixed voltage approach to a dynamic adaptive voltage system that can switch between different voltage levels (e.g., 1.8V, 3.0V) based on the specific SIM card inserted, thereby resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The system changes the voltage parameter adaptively based on SIM card detection. By monitoring the operating voltage characteristics of each SIM card and adjusting the driving voltage parameter in response, the system ensures reliable operation across different voltage requirements while maintaining a relatively simple control architecture through automated parameter adjustment.
2Reliability
If separate RF modules are used for each SIM card to ensure independent operation, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes a single RF module universal by enabling it to serve multiple SIM cards sequentially. The RF module is designed to be reconfigurable, allowing it to switch between different SIM cards and their respective network operations. This multi-functional approach eliminates the need for separate dedicated RF modules for each SIM card while maintaining reliable communication services.
Solution Approach 2:
The system merges multiple communication functions into a single RF module. Instead of having separate RF modules for each SIM card, the patent combines the radio frequency processing capabilities into one shared resource that time-division multiplexes between different SIM cards, thereby reducing hardware complexity while preserving service reliability.
3Reliability
If voltage detection and adjustment mechanisms are added to support different SIM card voltages, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The system implements self-service voltage detection and adjustment. The SIM card itself provides information about its voltage requirements, and the controller automatically detects and configures the appropriate driving voltage without requiring complex external intervention or manual setup. This self-configuring approach improves voltage compatibility while minimizing the complexity of control circuits.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system monitors the operating characteristics of each SIM card and adjusts the driving voltage based on detected voltage levels. This closed-loop feedback approach ensures voltage compatibility and reliable operation while keeping the control architecture relatively simple through automated voltage negotiation and adaptation.
Data Source
AI summary
A system for operating at least two subscriber identity cards has a subscriber identity module (SIM) controller generating a first voltage variable signal with a first voltage level to a first subscriber identity card during a first time period, generating the first voltage variable signal at a second voltage level to the first subscriber identity card during a second time period, receiving a first code indicating that generated voltage matches from the first subscriber identity card during the first or second time period, generating a first operating voltage with the first voltage level to the first subscriber identity card when receiving the first code in the first time period, generating the first operating voltage with the second voltage level when receiving the first code in the second time period.