RFID air interface anti-collision dispatching method

A scheduling method and air interface technology, applied in the field of radio frequency identification, can solve the problems of reducing the collision probability of the RFID air interface, the small throughput of the ALOHA protocol family, and the large system overhead of the binary tree protocol, so as to reduce the conflict period, reduce the load, and improve performance effect
CN101582111BInactive Publication Date: 2011-08-24SHANGHAI RES INST OF CHINA POST GROUP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI RES INST OF CHINA POST GROUP
Publication Date
2011-08-24
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses an RFID air interface anti-collision dispatching method, comprising the following steps: a reader transmits synchronous / actuating signals, tags in the antenna control area of the reader receive the synchronous / actuating signals and then a preset working frequency point is selected as the communication channel and a time slot in the data frame is randomly selected to transmit ID number; if the reader recognizes the ID number of the tags in the time slot, then the reader transmits a response signal to confirm the reception of the data of the tag, the tag does not transmit ID number within the scope of the reader any more after receiving the response; the reader adopted in the method is provided with an antenna array, any antenna of which is connected with a plurality of band-pass filters and all antennae are in the work state of transceiving signals, control areas of adjacent antennae do not overlap, the tags are provided with a plurality of working frequency points. The technical proposal of the invention is applicable to active and half active RFID system anti-collision dispatching method.
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Description

technical field

[0001] The invention relates to the technical field of Radio Frequency Identification (RFID for short), in particular to an anti-collision scheduling method for an RFID reading system. Background technique

[0002] The existing tag air interface anti-collision methods are based on the idea of ​​time division multiplexing (TDM), and are mainly divided into two categories: one is a non-deterministic algorithm, that is, an algorithm based on Aloha thought; the other is a deterministic algorithm, namely Algorithm based on binary tree search. The Aloha algorithm protocol family can be divided into pure ALOHA, slotted Aloha (Slotted Aloha), and frame-slotted Aloha (Frame-slotted Aloha). However, the algorithm based on ALOHA has an unstable working range, and the throughput is limited to 1 / e in theory. What's more serious is that the ALOHA protocol family will cause a specific tag to be incorrectly identified for a long period of time. The binary tree search algo...

Claims

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