Identification method based on hash function for RFID card reader time slot grouping or mapping multi-target tags

Abstract

The invention provides an identification method of a multi-target tag of RFID card reader time slot packeting or mapping based on a Hash function. The method includes: determining an adopted tag identification process according to the quantity of unidentified tags; constructing the Hash function for tag identification; packeting the tags, and randomly distributing time slots for each group of tagsfor tag identification; and continuously performing identification by a card reader based on the quantity and the frame length of the unidentified tags when there are remaining unidentified tags according to an identification result. According to the method, aiming at a tag collision problem of an Internet of Things radio frequency identification system, through the determination of the quantityof the tags, the TCS algorithm of a conventional communication mechanism is improved by employing the Hash function for mapping or packeting, the tag identification process is optimized, the throughput of the system is increased, and the tag collision rate of the system is reduced.

Description

technical field [0001] The invention belongs to the field of radio frequency identification (RFID) technology, and relates to a Hash function-based identification method for multi-target time slot grouping or mapping multi-target tags of an RFID card reader, which is used to solve the problem of anti-collision identification of RFID multi-targets. Background technique [0002] As an earlier automatic identification technology, RFID technology is widely used in production, transportation and public management by virtue of its simplicity, practicality, large data capacity, long service life, etc., and its integration with wireless sensor network technology and wireless communication technology. However, in this system, when a card reader recognizes multiple tags at the same time, the signals sent simultaneously on the same channel will cancel each other out Or form interference, causing the reader to fail to recognize the tag correctly. Therefore, the study of RFID multi-targ...

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Problems solved by technology

[0008] Aiming at the above-mentioned problems existing in the existing traditional DFSA algorithm and TCS algorithm in solving the multi-target anti-collision identification problem in the RFID system, the present invention provides a Hash function-based RFID card reader time slot grouping or mapping multi-target tags The identification method, through the judgment of the number of labels, chooses to use the Hash function to map or group, optimize the label identification process, improve the throughput of the system, and reduce the label collision rate of the system

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