Low-Power RFID Tag Clock Synchronization for Range
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Solution Overview
Problem
Current RFID communication systems that enable long-distance transmission are often expensive and power-hungry, making them prohibitive for new applications and areas, necessitating the development of low-power RFID communication methods.
Innovation Solution
The implementation of a system using synchronized active RFID tags with a network of access points, where RFID tags can transmit over longer distances efficiently by synchronizing their internal clocks with periodic signals, reducing power consumption and enabling battery-powered tags to operate for longer durations or at higher power levels, and utilizing a beacon communication module to manage communication with access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RFID tags transmit information over long distances, then communication range is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic transmission cycles where RFID tags alternately transmit data and enter sleep mode. The tag transmits during designated time slots and then powers down, creating a periodic pattern of active and inactive states. This reduces average power consumption while maintaining long-distance communication capability during active periods.
Solution Approach 2:
The system dynamically adjusts the RFID tag's power state between active transmission mode and low-power sleep mode based on communication requirements. The tag transitions between these states according to scheduled time slots, optimizing the balance between communication range and power consumption in real-time.
2Length of stationary object
If RFID tags transmit at higher power levels, then transmission distance is improved, but battery duration decreases
Solution Approach 1:
The patent employs periodic high-power transmission bursts followed by low-power sleep periods. During active time slots, the tag transmits at higher power levels to achieve long-distance communication, then enters sleep mode to conserve battery energy, extending overall battery duration while maintaining transmission distance capability.
Solution Approach 2:
The system uses high-power transmission only when necessary during designated time slots, rather than maintaining continuous high-power operation. This partial application of high power achieves the required transmission distance while avoiding excessive energy consumption that would reduce battery duration.
3Length of stationary object
If RFID tags use active transmitters, then communication range is improved, but device complexity increases
Solution Approach 1:
The patent manages the complexity of active transmitters by implementing periodic operation with predefined time slots. The tag's internal clock and scheduler automatically control transmission cycles, reducing the need for complex real-time decision-making logic and simplifying the overall device architecture despite using active transmission components.
Data Source
AI summary
A system and method for enabling low-powered RFID communication that includes at an RFID tag listening for a periodic signal containing beacon signals; synchronizing the internal clock to those beacon signals; identifying access points from the beacon signals; selecting an access point; sending a join request to the access point; identifying the tag to the access point; receiving an assigned time slot; and communicating with the access point in that time slot.