RFID Tag Write Check via CRC Extraction
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Solution Overview
Problem
Existing RFID technologies face delays in processing large data sizes due to time-consuming request/response cycles when checking data on RFID tags, especially when using direct data reception or tag group selection methods.
Innovation Solution
An RFID reader and tag system that includes a transmitter, receiver, and controller to send a write check command with tag memory parameters, receive a CRC value, and compare it to a stored value to verify data integrity, with the option to retry writing if the CRC values mismatch, and to resend the command if no response is received within a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct data reception method is used to check RFID tag data, then data verification can be performed, but processing time increases significantly with larger data sizes
Solution Approach 1:
The patent extracts only the essential verification element (CRC value) from the tag data rather than transferring and checking the entire data set. The reader requests and receives only the CRC value from the tag, compares it with its own calculation, and determines data integrity without handling the full data payload, thus significantly reducing communication time while maintaining verification reliability
Solution Approach 2:
The system performs preliminary calculation of the CRC value at the reader side before data transfer. By pre-calculating what the CRC should be and comparing it with the tag's stored CRC after write operation, the system can verify data integrity without re-transmitting or re-processing the actual data, enabling fast verification
2Adaptability or versatility
If tag group selection command is used to check RFID tag data, then multiple tags can be managed, but data check delays occur according to data size
Solution Approach 1:
The patent applies the extraction principle to multi-tag scenarios by requesting only CRC values from selected tag groups rather than retrieving full data from each tag. This allows efficient batch verification of multiple tags while minimizing communication overhead and time consumption
Solution Approach 2:
The write check command structure is designed to be universal and adaptable to different tag selection scenarios. The command can be applied to individual tags or groups of tags selected through various selection commands, providing a versatile solution that works across different RFID application scenarios without requiring separate verification mechanisms
Data Source
AI summary
An RFID reader, RFID tag, and method thereof for performing a write check of tag data. According to an exemplary embodiment, the RFID reader may include: a transmitter to transmit a write check command to an RFID tag; a receiver to receive a response including a check value of data, which needs a write check, from an RFID tag that has received the write check command; and a controller to perform information transmission and reception processes, and check data written on the RFID tag by using the received response.