Radio frequency identification system using multi-channel transmission to avoid packet collision

Abstract

The invention relates to a radio frequency identification system using the multi-channel transmission to avoid the packet collision. The radio frequency identification system comprises a plurality of radio frequency identification tag groups and at least on radio frequency identification reader. Each radio frequency identification tag group comprises at least one radio frequency identification tag. The radio frequency identification tag(s) in the same radio frequency identification tag group is (are) transmitted in the same transmission band, and the radio frequency identification tags in different radio frequency identification tag groups are transmitted in different transmission bands. When the radio frequency identification reader simultaneously receives the radio signals sent by all the radio frequency identification tags in the radio frequency identification tag groups, the packet collision of the radio frequency identification tags can be avoided because the radio frequency identification tags are transmitted in different transmission bands.

Description

technical field [0001] The present invention relates to a radio frequency identification system for avoiding packet collision, in particular to a radio frequency identification system for avoiding packet collision through multi-channel transmission. Background technique [0002] Radio frequency identification system (RFID, Radio Frequency Identification), mainly uses radio waves to transmit data to achieve an advanced technology for automatic identification of objects. It mainly includes two parts, radio frequency identification tags (RFID Tag) and radio frequency Identification reading device (RFID Reader). [0003] The radio frequency identification tag is assembled by a chip containing a unique identification code (UID) and an antenna unit through special packaging technology. Generally, radio frequency identification can be divided into active type and passive type according to the energy supply method. The difference is that the active type has a battery, while the pas...

AI Technical Summary

Problems solved by technology

[0009] The signal collision (Signal Collision) of the RFID system can generally be divided into two categories: tag signal collision and reading device signal collision. The former refers to the same reading device receiving signals returned by multiple tags at the same time, resulting in inaccurate Judgment or misjudgment, the latter is that the same tag receives commands from multiple reading devices at the same time, resulting in conflicts

Signal collision will cause signal transmission failure, loss, and even wrong interpretation of the signal to cause data error, etc., forming an obstacle to identification

[0010] At present, most of the methods used in the industry to solve signal collisions in radio frequency identification tag transmission use Time Division Multiple Access (TDMA) technology to control each radio frequency identification reading device to send signals at different time points. , but this processing method is more suitable for RFID systems with a small number of RFID reading devices. Once the number of RFID reading devices deployed reaches a certain ratio, the performance and reliability of the system will begin to increase the decline

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