Anti-collision method and system for an RFID reader

Abstract

The present invention discloses a RFID reader anti-collision method and system. The method comprises: a reader obtains the frame length information of a server; the frame length information is configured for expressing the slot time ordinal number included in each frame, and one selected slot time ordinal number is randomly selected from the slot time ordinal number; the N slot time ordinal number sent by the server is obtained, the N slot time is accessed; the selected slot time ordinal number and the N slot time ordinal number are compared to obtain a comparison result; when the comparison result expresses that the selected slot time ordinal number is the N-1 slot time ordinal number, it is determined whether the reader identifies labels at the N-1 slot time or not; if the reader does not identify labels at the N-1 slot time, it is determined whether there is a reader for identifying the labels in the readers with a distance from the reader being less than a preset threshold value or not; and if the there is no reader for identifying the labels in the readers with a distance from the reader being less than a preset threshold value, the reader performs label identification at the N slot time. The RFID reader anti-collision method and system can increase the number of readers which can complete the identification process at the same slot time so as to improve the work efficiency of the system.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to an anti-collision method and system for an RFID reader. Background technique [0002] With the development of social economy, the concept of the Internet of Things is becoming more and more popular, and Radio Frequency Identification (RFID, Radio Frequency Identification) technology, as one of the core technologies of the Internet of Things, has also received more and more attention. [0003] RFID technology is a non-contact identification technology that does not require manual intervention and line-of-sight contact, and automatically identifies objects with tags through radio frequency signals. RFID technology has been applied in many occasions, such as: supermarket inventory management, airport luggage management, indoor positioning, tracking, etc. [0004] RFID systems include readers and tags. The tag is attached to the target object, and the reader is used to ide...

AI Technical Summary

Problems solved by technology

But when the number of tags is large, the recognition speed of a single reader is very slow and the performance is poor, so multiple readers are introduced to identify tags

When all the readers work at the same time, because multiple readers send radio frequency signals at the same time, it will cause interference between the readers, the tags in the overlapping area cannot be correctly identified, and the two readers in the adjacent position cannot work normally. , so that a collision occurs, reducing the efficiency of the RFID system

[0005] In the existing anti-collision method for RFID readers, in the current time slot, only the readers whose selected time slot is the same as the current time slot are judged, so that the readers who can complete the identification process in the current time slot cannot fully complete the identification process, reducing the efficiency of the system

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