RFID Location System Using Area IDs for Multi-Floor Tracking
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Solution Overview
Problem
Current location systems face challenges in accurately tracking mobile wireless devices across multiple areas and levels, especially in environments with complex layouts, and lack efficient methods to differentiate between areas and floors, which affects their ability to provide precise location data and monitor proximity contacts.
Innovation Solution
The proposed location system employs RFID tags and exciters that transmit area IDs, allowing tags to maintain location information even when out of range, using Bluetooth Low Energy (BLE) and Low Frequency (LF) signals for precise positioning and proximity detection, with a central server calculating locations and confidence values for contacts, and alerts users through piezoelectric speakers and haptic motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tags and exciters transmit area IDs to maintain location information across multiple areas, then location tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The system divides the facility into multiple areas and levels, each with unique area IDs. RFID exciters are strategically placed in different locations to transmit these area IDs, enabling the system to track which area a tag is in without requiring continuous line-of-sight tracking. This segmentation approach improves location accuracy while managing system complexity through modular area-based identification.
Solution Approach 2:
The patent introduces area IDs as intermediary information carried by RFID exciters. Instead of directly tracking the precise position of mobile devices, the system uses area IDs as a mediator to determine location. The central server processes these area ID transmissions to calculate locations and determine proximity contacts, simplifying the tracking mechanism while maintaining accuracy.
2Measurement precision
If the system uses multiple wireless technologies (RFID, BLE, LF) for location tracking, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system employs multiple wireless technologies (RFID for area identification, BLE for proximity detection, LF for contact tracking) that can operate independently or in combination. Each technology serves specific functions: RFID exciters transmit area IDs, BLE detects proximity within areas, and LF signals confirm contact. This multi-functional approach allows the system to achieve high positioning precision across different scenarios without requiring a single complex unified technology.
Solution Approach 2:
The tracking system is segmented into different functional layers: area-level tracking using RFID, proximity-level tracking using BLE, and contact-level verification using LF. This segmentation allows each technology to be optimized for its specific purpose while working together to provide comprehensive location tracking, reducing the complexity burden on any single technology.
3Reliability
If the system continuously monitors location and proximity data, then reliability of contact tracking is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic transmissions of area IDs by RFID exciters and mobile devices rather than continuous monitoring. Tags transmit their location information at scheduled intervals, and the central server processes these periodic updates to maintain location tracking. This periodic action reduces energy consumption compared to continuous monitoring while maintaining reliable contact tracking through consistent periodic data collection.
Solution Approach 2:
Mobile devices and RFID exciters autonomously transmit their location and identification information without requiring constant external power or monitoring. The devices self-manage their transmission cycles, using their own power sources to periodically broadcast area ID and location data. This self-service approach reduces the energy burden on the central system while maintaining reliable tracking.
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 system ensures accurate tracking and area differentiation across multiple levels, enables efficient monitoring of proximity contacts with confidence values, and provides alerts for close encounters, enhancing the precision and usability of location tracking in complex environments.
Implementation Method 1
The mobile wireless devices which are located and tracked in location systems may, for example, be tags, transponders or mobile communications devices
Implementation Method 2
using Bluetooth Low Energy (BLE) and Low Frequency (LF) signals for precise positioning and proximity detection
Implementation Method 3
using Bluetooth Low Energy (BLE) and Low Frequency (LF) signals for precise positioning and proximity detection
Implementation Method 4
alerts users through piezoelectric speakers and haptic motors
Implementation Method 5
alerts users through piezoelectric speakers and haptic motors
Data Source
AI summary
A location system with an RFID tag, first and second location receivers and a central server receiving information from at least one of the first and second location receivers. The system calculates the RFID tag's location. The system may include a short-range exciter. The short-range exciter transmits a low frequency signal, possibly at 125 kHz. The central server creates a record containing information when the multiple RFID tags were within close proximity. The RFID tags can provide an indication that they were within close proximity to each other, via audio signals and/or haptic vibrations.