RFID Tag Reading Device Collision Estimation
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Solution Overview
Problem
Existing RFID tag systems face inefficiencies in ID reading due to signal collisions, requiring repeated reading processes when collisions occur, which prolongs the time needed to read IDs from multiple wireless tags.
Innovation Solution
An RFID tag reading device and method that includes a response requesting unit, a response reception unit, a reading result acquisition unit, a collision occurrence status acquisition unit, and a reading result complementation unit to detect signal collisions, count collision time slots, and estimate the number of readable wireless tags, allowing for efficient ID reading without re-execution when collisions occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated reading processes are executed when signal collisions occur, then ID reading completeness is improved, but reading time increases significantly
Solution Approach 1:
The system performs preliminary actions by estimating the number of readable tags before completing the reading process. The collision occurrence status acquisition unit counts collision time slots, and the reading result complementation unit calculates the estimated number of readable tags in advance, allowing the system to determine when to stop reading without needing to repeatedly execute the reading process.
Solution Approach 2:
The system implements feedback mechanisms where the collision occurrence status acquisition unit continuously monitors and counts signal collisions during the reading process. This feedback information is used by the reading result complementation unit to calculate the estimated number of readable tags, which then determines the termination condition for the reading process, eliminating the need for repeated executions.
2Measurement precision
If the reading process is re-executed after signal collisions, then reading accuracy is improved, but processing efficiency deteriorates
Solution Approach 1:
The system enables self-service by having the reading device automatically estimate the number of readable tags using the formula: estimated number of readable tags = read tag number + 2 × number of collisions. This self-calculating mechanism eliminates the need for external intervention or repeated reading processes, maintaining reading accuracy while significantly improving processing efficiency.
Solution Approach 2:
The system changes the parameter of determining reading termination from 'complete reading confirmation' to 'estimated number of readable tags'. By using the collision count and read tag number to calculate the estimated number of readable tags, the system can accurately determine when to stop reading without needing to re-execute the reading process, thus maintaining accuracy while improving efficiency.
Data Source
AI summary
An RFID reading device according to the present invention includes: response requesting unit (20) configured to output a response request signal to a wireless tag; response reception unit (24) configured to extract an ID of the wireless tag and detecting a signal collision of a response from the wireless tag, based on a response signal output from the wireless tag in response to the response request signal; reading result acquisition unit (25) configured to acquire a read tag number indicating the number of wireless tags from which the corresponding ID has been successfully read; collision occurrence status acquisition unit (26) configured to count the number of time slots in which the signal collision has occurred and calculating the number of collisions; and reading result complementing unit (27) configured to estimate the number of readable wireless tags based on the read tag number and the number of collisions.