RFID Tag Scheduling and Motion Alerts for Theft Detection
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Solution Overview
Problem
Conventional RFID systems face challenges in supporting large numbers of tags, long read ranges, fast response times, location detection, and high accuracy, particularly with passive RFID tags, while battery-assisted solutions increase size, cost, and complexity, and require battery replacement.
Innovation Solution
Implementing RFID tags with a rechargeable power source, CPU, alert indicators, and motion detectors, using time-slot communication control, alert control systems, and motion-based communication interrupts to optimize power consumption and improve read range and theft detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If passive RFID tags are used, then size and cost are reduced, but read range and response time are insufficient
Solution Approach 1:
The patent implements time-slotted communication where tags transmit data in periodic time slots rather than continuously. This allows tags to enter low-power states between transmissions, extending battery life while maintaining communication capability. The periodic transmission schedule enables readers to anticipate tag responses and manage multiple tags efficiently, improving read range and response time without requiring continuously active tags.
Solution Approach 2:
The patent employs dynamic communication scheduling where tags can adjust their transmission timing and power levels based on detected motion and communication needs. Motion-activated communication allows tags to become active only when movement is detected, reducing overall power consumption while maintaining responsiveness when needed. This dynamic approach enables extended read range without requiring tags to remain continuously active.
2Length of moving object
If battery-assisted passive RFID tags are used to increase read range, then read range is improved, but size, cost, and complexity increase
Solution Approach 1:
By implementing periodic time-slotted communication, the patent allows battery-assisted tags to transmit data intermittently rather than continuously. This reduces the average power consumption, enabling the use of smaller, lighter batteries that still provide sufficient operation lifetime. The periodic transmission schedule allows tags to recharge from harvested energy between transmissions, reducing battery size requirements while maintaining extended read range.
Solution Approach 2:
The patent utilizes energy harvesting to dynamically change the power availability parameter of tags. By harvesting energy from the RFID reader's electromagnetic field and other environmental sources, tags can accumulate energy in a small capacitor or battery, enabling extended read range without requiring large battery capacity. This parameter change allows the system to achieve long read range with minimal battery size.
3Length of moving object
If battery-assisted passive RFID tags are used to increase read range, then read range is improved, but battery replacement is required
Solution Approach 1:
The time-slotted communication protocol allows tags to enter deep sleep modes between scheduled transmissions, dramatically reducing average power consumption. This extended operational lifetime reduces or eliminates the need for battery replacement during the tag's service life. The periodic activation schedule enables tags to recharge from harvested energy during sleep periods, further extending operational duration.
Solution Approach 2:
The patent implements energy harvesting capabilities that allow tags to self-recharge from the RFID reader's electromagnetic field and other environmental energy sources. This self-service approach to power management enables tags to replenish their battery capacity during operation, significantly extending operational lifetime without external intervention or battery replacement. The harvested energy is stored in onboard capacitors or rechargeable batteries.
4Reliability
If motion detection and alert systems are added to tags, then theft detection is improved, but power consumption increases
Solution Approach 1:
The patent implements motion detection and alert systems that operate periodically rather than continuously. Motion sensors are activated at scheduled intervals during time slots, and alert indicators are triggered only when motion is detected. This periodic operation dramatically reduces power consumption compared to continuous monitoring, while maintaining effective theft detection capability through motion-activated communication and alerting.
Solution Approach 2:
The patent employs motion-activated communication where tags dynamically switch from low-power sleep mode to active communication mode only when motion is detected. This dynamic response allows the system to maintain high theft detection accuracy by immediately activating sensors and communication upon motion detection, while minimizing overall power consumption by keeping these systems dormant during stationary periods.
Data Source
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AI summary
Systems and methods for managing a tag. The methods comprise: placing the tag in a first operational mode in which an internal component ("IC") necessary to facilitate communication between the tag and a tag reader ("TR") are intentionally disabled; storing in the tag's data store a schedule specifying a scheduled time during which the tag is permitted to communicate with TR; selectively enabling IC at the scheduled time to permit the tag to communicate with TR; performing monitoring operations at the tag to determine when a predetermined condition has been detected; and causing the tag to autonomously perform an alerting function when the predetermined condition has been detected. The alerting function comprises (a) enabling a receiver of the tag to communicate with TR at an unscheduled time, and/or (b) activating an alert by enabling a hardware alerting component provided on the tag.