Wireless Tag Reader Dropout Detection via Group ID Storage
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Solution Overview
Problem
Existing wireless tag systems struggle to efficiently detect the removal of multiple articles with attached wireless tags, as they often require exact order arrangement and fail to accurately identify dropped tags, reducing efficiency in inspection processes.
Innovation Solution
A wireless tag reader/writer apparatus that uses a receiving/transmitting antenna, a tag-data storing unit, and a main control unit to detect group IDs stored in wireless tags, allowing for efficient detection of dropped tags by storing group IDs in both the EPC area and reserved area, enabling the identification of missing tags even when multiple articles are involved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data of only one or two adjacent wireless tags is stored as related data, then the system can detect single tag dropout, but it cannot detect when two or more articles dropout simultaneously
Solution Approach 1:
The patent segments the related data storage into multiple groups, where each wireless tag stores not only immediate adjacent tag data but also data from tags at fixed intervals (e.g., n-th tag before and after). This segmentation allows the system to detect multiple simultaneous dropouts by comparing expected vs. actual tag sequences across different intervals.
Solution Approach 2:
The patent extends the detection capability from a single-dimensional sequential check to a multi-dimensional verification system. By storing related data from tags at multiple positions (immediate neighbors, n-th neighbors before and after), the system creates multiple detection dimensions that can identify multiple simultaneous dropouts that would be invisible in a single-dimensional check.
2Measurement precision
If articles must be arranged in exactly the same order as before for detection, then dropout can be identified, but inspection efficiency decreases
Solution Approach 1:
The patent performs preliminary action by pre-storing related data from multiple wireless tags (including n-th adjacent tags) in each tag's memory before inspection. This preliminary data preparation allows the system to perform rapid dropout detection without requiring strict ordering during actual inspection, as the verification data is already in place for immediate comparison.
Solution Approach 2:
The patent changes the parameter of data storage by storing multiple types of related data (immediate neighbor data, n-th adjacent tag data, and their combinations) in each wireless tag. This parameter change enables the system to detect dropouts regardless of the order in which tags are inspected, thereby improving both detection accuracy and inspection efficiency.
3Reliability
If manual counting is used to determine whether all data has been read, then complete reading can be verified, but work efficiency is reduced
Solution Approach 1:
The patent implements self-service by enabling wireless tags to automatically store and provide related data from adjacent tags. This self-contained data structure allows the reader/writer apparatus to automatically verify reading completeness by checking the presence and consistency of related data, eliminating the need for manual counting while ensuring all data has been read.
Solution Approach 2:
The patent establishes a feedback mechanism where each wireless tag contains related data from other tags, creating a verification network. When the reader/writer apparatus reads a tag, it can immediately verify completeness by checking the related data feedback from that tag, providing automatic confirmation without manual intervention and maintaining high work efficiency.
Data Source
AI summary
A wireless tag reader/writer apparatus includes a receiving/transmitting antenna configured to transmit an interrogation signal to wireless tags, each having a storage unit with at least a reserved area and an EPC area for storing a group ID unique to the wireless tag, and configured to receive response signals from the wireless tags; a tag-data storing unit configured to store interrogation data and response data, the interrogation data being contained in the interrogation signal to be transmitted to the wireless tags, and the response data being contained in the response signals transmitted from the wireless tags; and a main control unit configured to detect the group ID stored in the reserve area of each wireless tag, from the response data stored in the tag-data storing unit, and configured to determine that at least one of the wireless tags has dropped out, from the number of group IDs stored in the reserved area of each wireless tag.