RFID Tag Persistence Enforcement Through Timed Reader Detection
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Solution Overview
Problem
Passive RFID tags face challenges in maintaining data persistence and operational states when powered by non-reader RF sources, leading to potential disruption of inventorying processes and exposure of sensitive data due to unanticipated power fluctuations.
Innovation Solution
The RFID integrated circuit (IC) is configured to enforce data or state persistence by automatically deasserting protocol flags, erasing stored data, or transitioning between operating states when a predetermined time interval without reader detection is exceeded, using mechanisms like analog flags or timers to ensure compliance with communication protocols even when powered by non-reader RF sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If RFID tags are powered by non-reader RF sources, then tags can maintain operation and data storage, but data persistence and protocol compliance are compromised due to unanticipated power fluctuations
Solution Approach 1:
The patent implements a timer mechanism that proactively monitors the duration of continuous power supply and preemptively triggers state reset or data erase operations before power fluctuations can cause protocol violations or data corruption. This preliminary action ensures that even when powered by non-reader RF sources, the tag maintains protocol compliance and data integrity by resetting its state before problematic conditions arise.
2Reliability
If RFID tags continuously monitor for reader presence, then protocol compliance can be maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring instead of continuous monitoring, where the tag checks for reader presence at predetermined time intervals using a timer. This periodic action reduces power consumption significantly compared to continuous monitoring, while still maintaining protocol compliance by detecting reader absence long enough to trigger appropriate state reset or data erase operations before protocol violations occur.
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 solution ensures reliable data persistence and operational stability of RFID tags by preventing unanticipated power disruptions, maintaining protocol compliance, and securing sensitive data, even when powered by non-reader RF signals.
Implementation Method 1
The demodulator block may be configured to detect modulated reader transmissions and demodulate reader commands from at least a subset of the modulated reader transmissions
Implementation Method 2
The tag either generates the transmitted back RF wave originally, or by reflecting back a portion of the interrogating RF wave in a process known as backscatter
Data Source
AI summary
RFID tags may compensate for non-RFID power sources by automatically enforcing data or state persistence even while powered. A tag may measure a time interval between successive detected modulated reader transmissions. If the interval exceeds a minimum time, then the tag may deassert a protocol flag, erase data, and/or change tag operating states, even if the tag would normally not perform these actions while powered.