NFC Router Card Emulation for Powered-Off Data Access
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Solution Overview
Problem
Existing mobile communication devices with NFC capabilities face challenges in accessing data when the device is powered off or the battery is discharged, as Host Card Emulation is not functional in these states, limiting data accessibility.
Innovation Solution
An NFC device with a memory and NFC router that operates in card emulation mode, allowing data access via an NFC antenna circuit, with access conditions verified based on the device's state and the requesting device, including digital signature verification and environmental parameter detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the mobile device is switched off or battery is discharged, then power consumption is reduced, but data accessibility via Host Card Emulation is lost
Solution Approach 1:
The patent segments the NFC functionality into two independent parts: the NFC router with its own memory and processing capabilities that can operate independently when powered, and the main mobile device processor that handles full device operations. This segmentation allows the NFC router to maintain data accessibility even when the main device is powered off, resolving the contradiction between power saving and data accessibility.
Solution Approach 2:
The NFC router acts as an intermediary between the external world and the mobile device's main processor. It can independently handle NFC communication and data access requests without requiring the main device to be powered on, thus maintaining data accessibility while allowing the main device to remain in a low-power state.
2Reliability
If the NFC router operates independently when device is powered off, then data accessibility is maintained, but security verification becomes more complex
Solution Approach 1:
The system performs preliminary actions by pre-loading authentication credentials and access control data into the NFC router's memory while the device is powered on. This allows the NFC router to independently verify access requests without needing to communicate with the main processor, simplifying the access control mechanism rather than complicating it.
Solution Approach 2:
The NFC router is designed to be self-sufficient by incorporating its own memory, processing capabilities, and authentication verification functions. It can independently verify access requests and manage data without requiring external assistance from the main device processor, thereby maintaining security while enabling independent operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables data accessibility even when the device is powered off or the battery is discharged, with selective access conditions ensuring secure data sharing, enhancing the functionality of NFC devices in various applications.
Implementation Method 1
an NFC antenna circuit, wherein the NFC router is capable of operating in a card emulation mode in which the shared data stored by the memory is accessible via the NFC antenna circuit
Data Source
AI summary
The disclosure concerns an NFC (near field communications) device having an NFC router. The NFC router includes a memory adapted to store data to be shared with an external device and an NFC antenna circuit. The NFC router is capable of operating in a card emulation mode in which the shared data stored by the memory is accessible via the NFC antenna circuit.