RFID Tag Timer Enforcing Data Persistence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Passive RFID tags face challenges in maintaining data persistence and state integrity when power is suddenly lost due to changes in reader frequency or distance, leading to potential data loss and disruption in inventorying processes.
Innovation Solution
Implementing a mechanism within RFID tags to automatically enforce data or state persistence by measuring time intervals between reader commands and using analog flags or timers to deassert protocol flags and transition to a power-up state if no active reader is detected, ensuring data retention and system stability even without continuous power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive RFID tags rely solely on RF power from readers, then device complexity is reduced, but data persistence and state integrity are compromised when power is lost
Solution Approach 1:
The patent implements a timer that proactively monitors the absence of reader commands and preemptively triggers persistence enforcement actions before power loss occurs. This preliminary detection and response mechanism ensures data integrity without requiring complex backup systems, resolving the contradiction between simple passive tag structure and reliable data persistence.
2Reliability
If tags continuously monitor for reader commands, then data persistence is enforced, but energy consumption increases
Solution Approach 1:
The patent employs periodic monitoring where the tag checks for reader commands at regular intervals rather than continuously. The timer mechanism allows the tag to enter low-power states between monitoring cycles, triggering persistence enforcement only when the periodic check detects an abnormal time interval. This periodic approach maintains state integrity while significantly reducing average power consumption compared to continuous monitoring.
3Reliability
If tags enforce persistence by deasserting flags and erasing data, then data integrity is maintained, but productivity of inventorying processes is reduced
Solution Approach 1:
The patent applies preliminary anti-action by preemptively clearing volatile memory and deasserting protocol flags when power loss is detected, preventing potential data corruption or inconsistent states. This proactive cleanup occurs automatically through the timer mechanism before the tag fully powers down, ensuring data integrity without requiring time-consuming verification processes during subsequent inventorying operations, thus minimizing impact on productivity.
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 that RFID tags maintain data integrity and operational stability by automatically managing power states and flag persistence, reducing the risk of data loss and inventory process disruptions caused by unexpected power loss or interference from non-RFID sources.
Implementation Method 1
A timer of the RFID tag may be used to determine whether a protocol flag has been asserted for a minimum amount of time
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
Implementation Method 3
Other RFID tags can be powered solely by the RF signal they receive
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 reader commands. 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.