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Intelligent RFID reading system anticonflict scheduling method

A technology of reading system and scheduling method, which is applied in the field of radio frequency identification, can solve the problems of long search time and low recognition efficiency, and achieve the effect of reducing the number of tags, avoiding too deep depth, and reducing the probability of conflict

Inactive Publication Date: 2009-02-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The current multi-antenna anti-collision mechanism uses the ALOHA algorithm. This anti-collision mechanism reduces the collision probability between tags to a certain extent, but the search time is still long and the identification efficiency is not high.

Method used

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  • Intelligent RFID reading system anticonflict scheduling method
  • Intelligent RFID reading system anticonflict scheduling method
  • Intelligent RFID reading system anticonflict scheduling method

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Embodiment

[0034] Such as figure 1 The schematic diagram of the shown RFID reading system, the RFID reading system includes an analog signal processing module, a digital signal processing module, a data processing module and an antenna array, the antenna array is connected with the analog signal processing module, and the data processing module passes the digital signal The processing module is connected with the analog signal processing module. In the present invention, 4 antennas are used as the antenna array, and the effective coverage areas of two adjacent antennas are in contact to reduce mutual overlap. However, the multi-antenna described in the present invention is more than 4 antennas, the number of reader control antennas can be adjusted according to the specific situation.

[0035] Such as figure 2 The schematic diagram of the interaction between the reader and the tag is shown, and its workflow is:

[0036] (1) Send a REQ command to the tag through the antenna;

[0037] (...

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Abstract

The invention provides a scheduling method to prevent conflicts in intelligent RFID read system. The method utilize the mechanism that reader controls multiple antennas, which is: all the antennas are controlled by the reader in order; the reader polls the antennas connected to the reader, and control the interactive between the single antenna and label; each time only one antenna can be activated to respond instructions from the reader; every two antenna effective covered regions are connected to reduce the overlap. The invention uses multiple antennas, at any time only one antenna takes effect, and then labels are divided into groups to recognize. The number of labels in the coverage covered by one antenna is reduced, thus the probability of conflicts is effectively reduced.

Description

technical field [0001] The invention relates to the field of radio frequency identification (Radio Frequency Identification, referred to as RFID), in particular to an anti-collision scheduling method for an intelligent RFID reading system. Background technique [0002] RFID technology is one of the main technologies in the field of automatic identification at present. Its main structure is composed of tags, antennas and readers. Among them, tags can be divided into active and passive. Send data to the reader antenna; passive tags need to be charged by the electromagnetic field formed by the radio waves emitted by the reader antenna, and use the converted electric energy to send data to the reader antenna, which requires a certain charging time. Currently, passive tags are widely used. The basic working principle of RFID is that the reader uses its own antenna to continuously transmit baseband signals outward, and loads commands on the baseband signal to check whether there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00H04L12/28
Inventor 李波谢胜利邓毅华吴宗泽
Owner SOUTH CHINA UNIV OF TECH
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