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

Inactive Publication Date: 2009-11-18
SHANGHAI RES INST OF CHINA POST GROUP
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Problems solved by technology

[0003] The purpose of the present invention is to provide an RFID air interface anti-collision scheduling method, which aims to greatly reduce the collision probability of the RFID air interface, and solve the problems of the small throughput of the ALOHA protocol family, the large system overhead of the binary tree protocol, and the ID number cannot be too long.

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Embodiment Construction

[0031] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] In the RFID system, for the reader and the tag, the reader used has an antenna array, any antenna of the antenna array is connected to multiple bandpass filters and all antennas are in the working state of sending and receiving signals, and the control areas of adjacent antennas are connected to each other. No overlapping, the label has multiple operating frequency points.

[0033] In order to realize the requirement of space division multiplexing, this method adopts a directional antenna, that is, an antenna whose peak sensitivity is a function of direction. Directional antennas have a large main lobe, and several sub-lobes or side lobes. On both sides of the maximum radiation direction of the main lobe, the angle between two points where the radiation intensity is reduced by 3dB (the power density is reduced by half) is the lobe wi...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00H01Q1/24
Inventor 戴奕
Owner SHANGHAI RES INST OF CHINA POST GROUP
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