RFID Tag Movement Detection via Discrete Reading Frequency
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Solution Overview
Problem
Conventional RFID tag information processing systems cannot selectively read information from tags that are moving in or out of an RFID tag-reading area, as they continuously read tags that are staying within the area, making it difficult to determine which tags are being moved.
Innovation Solution
A tag information processing system that includes a receiving section for reading RFID tag information, a detection frequency information obtaining section to determine the frequency of tag detection, and a movement determining section to differentiate between moving and staying tags based on detection frequency, allowing accurate determination of tag movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous reading operations are performed on all tags in the RFID tag-reading area, then complete tag information is obtained, but it becomes impossible to distinguish between moving tags and staying tags
Solution Approach 1:
The system performs reading operations at multiple discrete time points (first reading operation, second reading operation, etc.) instead of continuous reading. By comparing tag detection results across these periodic readings, the system identifies moving tags as those detected in one reading but not in subsequent readings, while staying tags remain detected across all readings.
2Productivity
If RFID tags are read continuously in the tag-reading area, then all tag information is captured, but the system cannot determine which tags are being moved out
Solution Approach 1:
The system performs a first reading operation to establish a baseline of all tags present in the reading area before movement occurs. This preliminary reading allows the system to compare subsequent readings against the initial state, enabling accurate identification of tags that have moved out of the area.
3Reliability
If all tags in the reading area are read at all times, then no tag information is lost, but the system cannot selectively identify moving tags
Solution Approach 1:
The system extracts only the necessary information for movement detection by comparing tag presence across different reading operations. Instead of processing all tag information continuously, the system focuses on identifying which tags are present in the first reading but absent in subsequent readings, thereby extracting movement status from complete tag data.
Data Source
AI summary
A tag information processing apparatus, including: a receiving section (101) for receiving read-out information of an RFID tag (100), the read-out information obtained through N reading operations (where N represents an integer equal to or greater than 2) carried out for an RFID tag-reading area; a detection frequency information obtaining section (102) for obtaining detection frequency information on the basis of the read-out information received by the receiving section (101), the detection frequency information indicating a detection frequency at which the read-out information of the RFID tag (100) is detected in the N reading operations; a movement determining section (103) for determining whether or not the RFID tag (100) has been moved out of the RFID tag-reading area, wherein, in a case where the detection frequency information obtained by the detection frequency information obtaining section (102) indicates that the detection frequency at which the read-out information of the RFID tag (100) is detected is low, the movement determining section (103) determines that the RFID tag (100) has been moved out of the RFID tag-reading area; and an output section (104) for outputting a result of the determination made by the movement determining section (103).