RFID Tag Group Association via Overlapping Antenna Zones
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Solution Overview
Problem
Existing RFID tag systems fail to accurately detect the moving direction of RFID tags and associate them correctly, especially when multiple tags move together, due to indirect estimation methods that often misinterpret irrelevant objects' movements.
Innovation Solution
A system where a representative RFID tag is associated with a group of tags, with overlapping communication areas for antennas to read data from both the representative and group tags, using the representative tag's moving direction as the attribute for the entire group, ensuring accurate direction detection and association.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is installed at the periphery of the antenna to detect moving direction, then the moving direction can be detected, but the sensor may react to irrelevant objects (humans, machines) not conveying the package, causing incorrect detection
Solution Approach 1:
The system separates the detection function into two independent parts: the RFID tag attached to the package and the reader/writer system. By reading data directly from the RFID tag on the package rather than using a separate sensor to infer movement, the system ensures that only the actual package movement is detected, eliminating false reactions to irrelevant objects.
Solution Approach 2:
The RFID tag on the package serves its own detection function by providing data that includes moving direction information. The tag automatically transmits its own movement status to the reader/writer without requiring external sensors to interpret its movement, making the package self-describing regarding its movement state.
2Productivity
If RFID tags are attached to packages for automatic data reading, then distribution efficiency is improved, but the system cannot detect moving direction or automatically detect entering and exit
Solution Approach 1:
The RFID tag system is enhanced to perform multiple functions: it not only stores identification data for automatic reading but also captures and transmits moving direction information and location data (entering/exiting). This multi-functional RFID system eliminates the need for separate sensors while maintaining distribution efficiency.
Solution Approach 2:
The patent combines the identification function and the movement detection function into a single RFID tag system. The RFID tag simultaneously provides package identification and moving direction information, merging what were previously separate functions (identification and movement sensing) into one integrated solution.
3Adaptability or versatility
If multiple RFID tags move together as a group, then group management is enabled, but the system cannot correctly associate tags with a representative tag or detect the group's moving direction
Solution Approach 1:
The system introduces a representative RFID tag as an intermediary for the tag group. This representative tag receives and consolidates data from multiple tags in the group, including their individual data and the group's moving direction. The representative tag acts as a mediator that manages the group's information centrally, enabling accurate association and detection.
Solution Approach 2:
The patent merges multiple RFID tags into a unified tag group managed by a representative tag. The representative tag consolidates data from all group members, combining their identification information and movement data into a single managed entity, allowing the system to treat the group as one unit while maintaining individual tag identities.
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 approach allows for precise detection of the moving direction of multiple RFID tags within a group without misinterpreting irrelevant movements, enhancing the accuracy and reliability of RFID tag tracking and management systems.
Implementation Method 1
a first antenna (4A) for scanning a radio wave beam towards a movement path of the representative RFID tag (2A) and reading out data from the representative RFID tag (2A), and a second antenna (4B) for collectively reading out data from each RFID tag (2B) of the tag group (2)
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
[PROBLEMS TO BE SOLVED] It is an object to provide a tag associating system that, when a plurality of RFID tags are collected to move as a tag group, associates the RFID tags belonging to the tag group with a representative RFID tag ranked as a representative of the tag group; its associating method; etc. [MEANS FOR SOLVING THE PROBLEMS] The present system associates an RFID tag (2A) ranked as a representative of the tag group (2). A communication area (J) of a first antenna (4A) to read out data from the representative tag group (2A) is arranged to partially overlap with a communication area (K) of a second antenna (4B) to read out data from each RFID tag (2B) of the tag group (2). When the first antenna (4A) reads out a plurality of times data from the representative RFID tag (2A), the second antenna (4B) reads out data from each RFID tag (2B) of the tag group (2), so as to make the data read out from the representative RFID tag (2A) and the data reads out from the RFID tag (2B) of the tag group (2) into a pair of associated data.