Intelligent RFID reading system anticonflict scheduling method

A technology of reading system and scheduling method, applied in the field of radio frequency identification, can solve the problems of low identification efficiency and long search time, and achieve the effect of reducing the number of tags, improving the identification rate, and shortening the identification time of tags

CN1975755AInactive Publication Date: 2007-06-06SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2007-06-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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 sig...

Examples

Embodiment

[0034] The schematic diagram of RFID reading system as shown in Figure 1, this RFID reading system comprises analog signal processing module, digital signal processing module, data processing module and antenna array, described antenna array is connected with analog signal processing module, and described data processing module The digital signal processing module is connected with the analog signal processing module. In the present invention, 4 antennas are used as the antenna array, but the multi-antenna described in the present invention is more than 4 antennas, and the number of antennas controlled by the reader can be adjusted according to specific conditions.

[0035] As shown in Figure 2, the schematic diagram of the interaction between the reader and the tag, its workflow is:

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

[0037] (2) Receive ACK, if only one tag responds to send ACK at this time, then the reader can recognize the ACK, if there are mul...