NFC Antenna LPCD Wake-Up Detection for Reliable Communication
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Solution Overview
Problem
Terminal devices in low power detection card (LPCD) mode face difficulty in exiting due to insufficient antenna coupling or weak electric field changes, leading to impaired communication efficiency.
Innovation Solution
An NFC electric field detection system with an NFC antenna and detection control module that receives a first radio frequency signal to identify the LPCD mode and sends a second radio frequency signal to excite the terminal device, ensuring normal communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device works in LPCD mode to reduce power consumption, then battery life is extended, but communication reliability deteriorates due to difficulty in exiting LPCD mode
Solution Approach 1:
The NFC antenna performs preliminary detection of the terminal device's working mode by receiving the first radio frequency signal before normal communication begins. This allows the system to identify when the terminal is in LPCD mode and take preliminary corrective action by sending the second radio frequency signal to wake up the terminal, preventing communication failures before they occur.
Solution Approach 2:
The patent introduces a second radio frequency signal as an intermediary mechanism to bridge the communication gap between the NFC device and the terminal in LPCD mode. This intermediary signal serves as a wake-up call that transitions the terminal from low-power state to active communication state, resolving the reliability issue without requiring continuous high-power operation.
2Use of energy by moving object
If the terminal device works in LPCD mode, then power consumption is reduced, but communication efficiency deteriorates due to difficulty in performing normal communication
Solution Approach 1:
The system performs preliminary detection of the terminal's LPCD status before attempting normal communication. By detecting the first radio frequency signal and identifying LPCD mode in advance, the system can proactively send the wake-up signal, ensuring smooth transition to normal communication and avoiding retransmissions that would reduce efficiency.
Solution Approach 2:
The NFC device receives feedback from the terminal device through the first radio frequency signal, which indicates the terminal's working mode. Based on this feedback, the NFC device adjusts its communication strategy by sending the appropriate second radio frequency signal to wake up the terminal, creating a feedback loop that optimizes communication efficiency while maintaining power savings.
3Device complexity
If antenna coupling area is insufficient or electric field change is not obvious, then device complexity is reduced, but detection precision deteriorates making it difficult to detect terminal mode
Solution Approach 1:
The patent changes the detection parameter from relying on electric field strength changes to detecting the presence and characteristics of radio frequency signals. By monitoring the first radio frequency signal transmitted by the terminal, the system can accurately detect LPCD mode without requiring large antenna coupling areas or significant electric field variations, thus maintaining detection precision with simpler antenna designs.
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
Enhances communication efficiency by waking up terminal devices from LPCD mode, allowing for accurate and timely communication with improved signal processing and reduced noise interference.
Implementation Method 1
the NFC antenna is configured to: when the terminal device transmits an NFC signal, sense field strength of the NFC radio frequency field to form an electrical signal corresponding to the field strength
Implementation Method 2
the NFC coil is configured to sense a radio frequency signal
Data Source
AI summary
This specification provides an NFC electric field detection system and method, and an NFC device. The NFC electric field detection system in this specification includes an NFC antenna and a detection control circuit. The near field communication NFC antenna is configured to: in a case that an NFC radio frequency field of a terminal device is sensed, receive a first radio frequency signal transmitted by the terminal device; and the detection control module is configured to detect, according to the first radio frequency signal, that the terminal device is in a low power detection card LPCD mode; and in a case that abnormal communication is performed with the terminal device, send, to the terminal device by using the NFC antenna, a second radio frequency signal used to excite the terminal device, so as to communicate with the terminal device.