Networked radio frequency identification device (RFID) reader and anti-collision method thereof

Abstract

The invention relates to a networked radio frequency identification device (RFID) reader and an anti-collision method thereof. The networked RFID reader comprises a central module and at least one antenna module, wherein the central module is connected with each antenna module through a local area network; the central module transmits information to all the antenna modules in a broadcasting mode and receives tag identification information uploaded by each antenna module in a polling mode; the central module is in charge of controlling and managing the tag identification processes of all the antenna modules and acquire the tag information identified by each antenna module; and each antenna module receives a command of the central module and identifies part of or all the electronic tags in the action range of the antenna module through a radio interface and reports the information of identifying the tag to the central module. The anti-collision method is a time slot Aloha algorithm-based anti-collision method or a tree type branched algorithm-based anti-collision method. Through the networked radio frequency identification device (RFID) reader and the anti-collision method, quick communication among short-distance data equipment can be realized with lower cost, the identification rate can reach 100 percent and the cost is low.

Description

technical field [0001] The invention relates to the technical fields of radio frequency identification and local area network, in particular to a networked RFID (radio frequency identification) reader and its anti-collision method. Background technique [0002] The radio frequency identification system is a communication system composed of readers and tags through wireless communication, and has extremely wide application prospects. The second-generation radio frequency identification technology working in the ultra-high frequency band will fully replace the first-generation products because of its small size, recognition distance of more than 1m, and fast information transmission rate. However, due to the complexity of the propagation process of radio waves in the actual environment, the limited power supply of electronic tags (such as passive tags), conflicts and other reasons, the tag recognition rate and recognition speed of the second-generation radio frequency identifi...

AI Technical Summary

Problems solved by technology

[0003] 1. When the azimuth angle of the reader antenna or the orientation of the tag (antenna) cannot be adjusted, even if the distance is relatively short, there will always be a small number of tags with a specific orientation that cannot be recognized. That is to say, if the reader cannot be adjusted The recognition rate cannot reach 100% due to the orientation of the antenna of the writer or tag. In other words, if the reader uses only one antenna module, even if the method of relatively stationary or simply moving the orientation of the item tag is adopted, there are still a small number of normal tags that cannot be detected. Likelihood of correct identification

[0004] 2. Due to the limitation of the information transmission rate and the impact of conflicts when different tags respond to the reader at the same time, the rate at which the reader recognizes the tags is not high enough to meet the needs of some occasions that require rapid identification

Although using multiple reader systems to work at the same time can further increase the recognition rate, the economic cost of adding equipment is relatively large.

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