Hybrid RF Polling Loop for NFC Tag Detection
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Solution Overview
Problem
NFC devices face challenges in minimizing power consumption during polling operations, particularly when encountering communication errors or tags that are not detectable using low power polling mode, which can lead to increased power usage and reduced RF range.
Innovation Solution
A hybrid RF polling loop with a retry mechanism and a hybrid polling mode that combines low power polls with normal power polls, allowing configurable retries and specified iterations to improve detection and activation success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low power polling mode is used, then power consumption is reduced, but tag detection capability deteriorates
Solution Approach 1:
The system dynamically switches between low power polling mode and normal polling mode based on detection needs. The NFC controller can adaptively adjust the polling mode during operation, transitioning from low power mode for routine checks to normal mode when tag detection is required, thus optimizing both power consumption and detection capability throughout the operation cycle.
Solution Approach 2:
The system implements periodic low power polls interspersed with normal power polls. By arranging polling operations in a periodic pattern where low power polls occur frequently and normal power polls occur at intervals, the system maintains adequate tag detection capability while minimizing overall power consumption through the predominant use of low power mode.
2Reliability
If normal power polling mode is used, then tag detection capability is improved, but power consumption increases
Solution Approach 1:
Instead of continuously using full normal power polling mode, the system applies partial action by using low power polls for the majority of the time and only activating normal power polls when necessary for tag detection. This partial use of full power mode significantly reduces overall power consumption while maintaining adequate detection capability.
Solution Approach 2:
The system dynamically adjusts polling power levels based on operational requirements, transitioning between low power and normal power modes rather than maintaining a static high-power state. This dynamic adaptation ensures normal power is used only when detection capability is needed, minimizing unnecessary power consumption.
3Use of energy by moving object
If communication errors occur during low power polling, then power consumption remains low, but activation success rate decreases
Solution Approach 1:
The system implements a feedback mechanism where communication errors detected during low power polling trigger a response action. When errors are detected, the system feeds back this information and activates normal power polling mode to retry the activation process, ensuring that power consumption remains low during successful operations while maintaining high activation success rates through error-driven mode switching.
Solution Approach 2:
The system performs preliminary low power polls to detect tags and assess communication conditions before committing to full activation. By conducting preliminary checks in low power mode and only transitioning to normal power mode when necessary, the system prepares in advance to avoid unnecessary power consumption while ensuring activation success when conditions warrant it.
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 hybrid RF polling loop and retry mechanism effectively reduce power consumption while enhancing tag detection and activation success rates, improving user experience by optimizing power usage and RF range.
Implementation Method 1
transmitting an RF poll to a NFC tag
Implementation Method 2
detecting a loading effect on the magnetic field caused by the near field communication object
Data Source
Figure 1
Figure 2~3
AI summary
Various exemplary embodiments relate to a method of controlling a near field communications (NFC) system, including: performing a low power poll of a tag; detecting a tag; initiating a first activation of the detected tag; receiving an indication that the first activation fails; reading a number of retries N from a memory; performing a second activation.