NFC Probe Signal Interference to Exit Low-Power Card Detection
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Solution Overview
Problem
Existing NFC technologies face challenges in achieving high success rates for reading tag information due to low power card detection mode, which reduces sensing distance and sensitivity, leading to repeated attempts or failures in reading NFC tags.
Innovation Solution
A near field communication method and device that detects a probing signal in low power mode and transmits a disturbance signal to induce interference superposition, triggering 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 to reduce power consumption, then energy efficiency is improved, but sensing distance and sensitivity deteriorate
Solution Approach 1:
The NFC device performs preliminary detection of the probing signal in low power mode, then proactively transmits a disturbance signal to trigger mode switching before actual card detection is needed, ensuring high sensitivity is available when required
Solution Approach 2:
The system dynamically switches between low power mode and standard card detection mode based on detection needs. The disturbance signal triggers a temporary transition to high sensitivity mode, allowing the system to adapt power consumption to actual operational requirements
2Duration of action of moving object
If low power card detection mode is used to extend battery life, then duration of operation is improved, but detection reliability deteriorates
Solution Approach 1:
The patent converts the harmful effect of low sensitivity in low power mode into a beneficial trigger mechanism. The weak probing signal in low power mode, which would normally cause detection failures, is used as a trigger to initiate disturbance signal transmission, which then forces a mode switch to high sensitivity, turning the limitation into an activation mechanism for reliable detection
3Area of stationary object
If repeated attempts are made to read tag information in low power mode, then detection coverage is maintained, but time consumption increases
Solution Approach 1:
Instead of repeatedly attempting detection in low power mode, the system skips directly to transmitting a disturbance signal that forces a mode switch to standard card detection mode, rushing through the detection process in a single high-sensitivity attempt rather than multiple low-sensitivity attempts
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
The method and device enhance the success rate of reading NFC tag information by causing significant signal variation in the probing signal, allowing the card reader device to detect the NFC device nearby more reliably.
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
Figure 1(a)~1(c)
Figure 2
Figure 3~4
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.