Multi-Interface Tape Nodes Using BLE-Triggered RFID Fine Locationing
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Solution Overview
Problem
Bluetooth-based locationing is coarse due to signal range, while RFID readers require significant power and are impractical for battery-powered deployment, limiting their mobility and accuracy.
Innovation Solution
A battery-powered multi-communication-interface tape node that uses event-driven power management, combining Bluetooth for detection and activating an RFID reader only when necessary to improve location accuracy with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID readers are used for locationing, then measurement precision is improved, but use of energy increases significantly
Solution Approach 1:
The RFID reader operates dynamically by switching between active and inactive states based on detected events. The system activates the RFID reader only when a Bluetooth Low Energy (BLE) trigger event occurs, such as detecting a specific BLE device or signal pattern, rather than operating continuously. This dynamic operation mode maintains high location accuracy when needed while dramatically reducing average power consumption.
Solution Approach 2:
The system uses periodic BLE scanning to monitor for trigger events, and only activates the RFID reader in response to these periodic detections. This periodic activation pattern allows the system to maintain locationing capability while operating the high-power RFID reader only intermittently, thus balancing measurement precision with energy conservation.
2Reliability
If RFID readers operate continuously, then reliability of tag detection is improved, but loss of energy increases
Solution Approach 1:
The system performs preliminary detection using low-power BLE technology to identify potential targets before activating the RFID reader. By using BLE to scan and detect trigger events in advance, the system ensures that the RFID reader is activated only when a tag is likely to be present, maintaining detection reliability while avoiding unnecessary energy consumption during periods when no tags are nearby.
Solution Approach 2:
BLE technology serves as an intermediary between continuous monitoring requirements and RFID reader operation. The BLE device acts as a mediator that detects trigger events and conditions RFID reader activation, enabling the system to maintain reliable tag detection through coordinated operation of both BLE and RFID components while minimizing overall energy loss.
3Use of energy by moving object
If Bluetooth is used for locationing, then use of energy is reduced, but measurement precision deteriorates
Solution Approach 1:
The locationing function is segmented into two distinct stages: a first stage using low-power BLE for initial detection and trigger event identification, and a second stage using RFID for precise locationing when triggered. This segmentation allows the system to use energy-efficient BLE for broad area monitoring while reserving the more accurate but power-intensive RFID technology for specific moments when location precision is critically needed.
Solution Approach 2:
The system implements multi-functionality by combining both BLE and RFID technologies in a single locationing platform. Each technology serves its optimal function: BLE provides wide-area, low-power detection capability, while RFID provides high-precision locationing when activated. This universal approach leverages the strengths of both technologies to achieve both energy efficiency and measurement precision.
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
Enables fine locationing with improved accuracy and mobility by activating RFID readers only when needed, conserving battery power and allowing easy deployment without hard wiring.
Implementation Method 1
Radio frequency identification (RFID) has a shorter wireless signal range, and thereby improves the resolution/accuracy of location determined by proximity to an RFID reader
Implementation Method 2
short-range wireless protocols, such as Bluetooth, when used for locationing
Data Source
AI summary
A multi-communication-interface system methods implement fine locationing while conserving battery power. A first wireless-communication interface of a first multi-communication-interface tape node located at a first location in an area detect a first wireless signal from a second tape node at a first time. A first receiver of a second wireless-communication interface of the first multi-communication-interface tape node is activated in response to detecting the first wireless signal and used to receive a first response signal from a first wireless tag in response to an interrogation signal. The first receiver is deactivated to conserve power within an internal battery of the at least one second multi-communication-interface tape node and a location of the first wireless tag at the first time is determined as the first location.