Battery-Assisted RFID Tag Interference Control
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Solution Overview
Problem
Current RFID systems face limitations in range and reliability, especially for passive UHF tags, which are restricted by power consumption and interference, and active systems are costly with limited operational life, necessitating an intermediate solution that enhances range and interference resistance.
Innovation Solution
The development of battery-assisted RFID systems with improved sensitivity and dynamic range states, using a transistor-based square law receiver and advanced command sets for interference control, power management, and activation protocols to enable flexible and efficient operation across various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive UHF RFID systems are used to reduce cost and simplify operation, then device complexity is reduced, but range and reliability are limited due to power consumption constraints
Solution Approach 1:
The patent combines passive RFID tag simplicity with active RFID functionality by introducing a battery-assisted passive tag architecture. The tag merges passive backscatter communication with active battery-powered operation, enabling extended range and improved reliability while maintaining low complexity. The battery provides supplemental power to enhance transmit capability and extend operational range beyond what passive tags can achieve.
Solution Approach 2:
The system dynamically switches between passive and active operating modes based on environmental conditions and communication requirements. The tag can operate in passive mode during normal conditions and switch to active battery-powered mode when extended range or reliability is needed, providing adaptive performance without requiring full active RFID complexity.
2Reliability
If active RFID systems are used to extend range and improve performance, then range and sensitivity are improved, but cost increases and operational life is limited
Solution Approach 1:
Instead of fully activating all active RFID capabilities continuously, the system applies partial active operation only when needed. The battery provides supplemental power during specific transmission events or when extended range is required, rather than continuously powering all active components. This reduces overall complexity and power consumption while achieving the necessary performance improvements.
Solution Approach 2:
The battery acts as an intermediary energy source between passive power harvesting and full active RFID operation. It provides supplemental energy to bridge the gap, enabling extended range and improved reliability without requiring complete active RFID system complexity. The battery mediates between the simplicity of passive tags and the performance of active tags.
3Adaptability or versatility
If multiple readers operate simultaneously in overlapping coverage areas, then system versatility and coverage are improved, but interference between readers increases
Solution Approach 1:
The system employs periodic time-slot based communication rounds where readers take turns interrogating tags. Each reader operates in periodic intervals rather than continuously, allowing other readers to operate without interference during their designated time slots. This periodic structure enables multiple readers to coexist in overlapping coverage areas while minimizing mutual interference.
Solution Approach 2:
The system uses feedback mechanisms where readers monitor the RF environment and adjust their operation based on detected interference levels. When interference is detected from other readers, readers can modify their transmission timing, power levels, or selectivity to reduce harmful effects. Tags also provide feedback about their reception conditions, enabling readers to optimize their operation.
4Duration of action of moving object
If battery power is continuously supplied to extend operational life, then duration of action is improved, but power consumption increases reducing efficiency
Solution Approach 1:
The battery operates in periodic duty cycles rather than continuously. It provides power during brief transmission events when the tag needs to communicate, then enters low-power sleep modes between transmissions. This periodic operation extends operational life by efficiently managing battery energy, providing just enough power when needed while minimizing overall power consumption.
Solution Approach 2:
The system maintains continuous communication capability through the battery, ensuring the tag can always respond to readers when needed. The battery provides uninterrupted power for critical transmission events, maintaining the continuity of useful communication action while managing power consumption through intelligent duty cycling and sleep modes during non-critical periods.
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
These systems provide extended range and reliability while minimizing interference, optimizing battery life, and allowing scalable performance options, accommodating a wide range of applications with enhanced sensitivity and interference resistance.
Implementation Method 1
Passive LF, HF, and UHF RFID systems comprise tags that operate without batteries and effectively leverage power that is wirelessly received from an RFID reader
Implementation Method 2
using a transistor-based square law receiver
Data Source
AI summary
Specialized battery assisted command set design methods are disclosed that provide for interference rejection using highly sensitive but relatively broadband RFID tags. The command set design also supports RFID system RF power control for further interference control. The command set design also allows for convenient expansion to active transmitters and receivers in tags operating within the same system. Embodiments of the present invention provide RFID systems having battery-assisted, Semi-Passive RFID tags that operate with sensitive transistor based square law tag receivers utilizing a plurality of tag receiver dynamic range states. Additional enhancement attained via power leveling methods that optimize the amount of transmitted power and interference from a reader in relation to the sensitivity of the RFID tags, their ranges from the reader, and the unique physics of the backscatter RFID radio link.