NFC Reader Wake-Up via Signal Interference in Low-Power Detection
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Solution Overview
Problem
The low power card detection mode in NFC devices reduces power consumption but decreases the success rate of reading tag information due to reduced signal strength and sensitivity, often requiring multiple attempts, which affects user experience.
Innovation Solution
The NFC device detects a probing signal in low power mode and transmits a disturbance signal when certain conditions are met, causing interference superposition to trigger the card reader device to exit low power mode, thereby increasing the success rate of reading tag information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low power card detection mode is used, then power consumption is reduced, but the success rate of reading tag information decreases
Solution Approach 1:
The NFC device performs preliminary detection of the probing signal in low power mode, and when specific conditions are met (signal strength threshold, rising edge transition), it proactively transmits a disturbance signal to trigger the card reader to exit low power mode, preventing repeated failed attempts
Solution Approach 2:
The system dynamically changes the power mode parameter based on detection results. When the probing signal meets specific conditions (amplitude threshold, rising edge transition), the NFC device transmits a disturbance signal that causes parameter variation in the communication channel, triggering the card reader to switch from low power mode to standard mode, thereby improving reading success rate
2Use of energy by moving object
If low power card detection mode is used, then power consumption is reduced, but signal strength and sensitivity decrease
Solution Approach 1:
The NFC device utilizes the harmful effect of the disturbance signal on signal stability by intentionally transmitting it to create significant signal variation. This variation helps the card reader detect the NFC device's presence more reliably, converting the harmful signal interference into a beneficial detection mechanism that improves sensitivity in low power mode
3Reliability
If multiple reading attempts are made, then reading success rate may improve, but user experience deteriorates
Solution Approach 1:
The system performs preliminary detection of the probing signal characteristics before attempting to read tag information. By detecting specific conditions (signal strength, rising edge transitions) and proactively transmitting a disturbance signal to exit low power mode, the system prevents repeated failed reading attempts, thereby improving user experience while maintaining high reading success rate
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
This method enhances the success rate of reading NFC tag information by causing significant signal variation, allowing the card reader device to detect the NFC device nearby more reliably, thus improving user experience.
Implementation Method 1
transmitting a disturbance signal when it is detected that a transmission status of a first probing signal satisfies a condition for signal interference superposition, so that interference superposition is performed between the disturbance signal and the first probing signal
Data Source
AI summary
One or more embodiments of this specification provide near field communication methods and devices. The near field communication device can detect a probing signal transmitted by a card reader device in a low power card detection mode; and transmit a disturbance signal when detecting that a transmission status of the first probing signal satisfies a condition for signal interference superposition, so that interference superposition is performed between the disturbance signal and the first probing signal, and then the card reader device is triggered to exit the low power card detection mode.