Wireless Tag Reading That Preserves Presence Detection Under Read Failures
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Solution Overview
Problem
Wireless tag reading apparatuses, such as RFID tag readers, often fail to read tag data due to distance and interference, leading to loss of presence or location determination of the tag.
Innovation Solution
A wireless tag reading apparatus that includes a processor to control reading devices, determine normal data reading, and output tag data or presence information based on response waves, even if data cannot be normally read.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reading device attempts to read tag data by decoding response wave, then tag data can be read when signal quality is sufficient, but reading fails when distance increases or interference occurs
Solution Approach 1:
The system performs partial reading success - when tag data cannot be fully decoded, it still extracts and outputs available information such as presence detection and position data from the partially received response wave, rather than requiring complete data decoding for any useful output
Solution Approach 2:
The system introduces an intermediary processing layer that decouples presence detection from data reading - the response wave is first processed to determine tag presence and position, then tag data is attempted to be read separately, allowing presence information to be obtained even when data reading fails
2Measurement precision
If the system requires normal tag data reading to determine tag presence or location, then accurate data can be obtained, but the determination fails when reading encounters errors
Solution Approach 1:
The system segments the tag reading process into distinct independent functions: response wave reception, presence determination, position determination, and tag data reading. This allows each function to operate independently, so failure in data reading does not affect presence or position determination
Solution Approach 2:
The system performs presence and position determination before attempting tag data reading. By establishing presence and location information first from the response wave, the system ensures this critical information is captured even if subsequent data reading fails
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
Ensures continued operation and accurate determination of tag presence and position, improving convenience and efficiency in reading operations.
Implementation Method 1
a wireless tag reading apparatus reads tag data by decoding a response wave from a wireless tag
Data Source
AI summary
A wireless tag reading apparatus includes a reading device; and a processor configured to: control the reading device to attempt to read tag data from a wireless tag based on a response wave transmitted from the wireless tag, determine whether the tag data has been read normally, upon determining that the tag data has been read normally, output either the tag data or first information based on the tag data, and upon determining that the tag data has not been read normally, output second information indicating presence of the wireless tag.