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Carrier monitoring multi-path access protocol in reader-based radio frequency identification

A multiple access protocol and radio frequency technology, applied in the field of carrier sense multiple access protocol and radio frequency identification, it can solve the problems of lack of carrier sense and reduce the amount of communication data of readers, so as to achieve the optimal competition probability and reduce data. Transmission volume, the effect of reducing channel collision

Inactive Publication Date: 2012-01-25
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is how to effectively improve the tag reading efficiency and reading rate in the radio frequency identification system. , so that the electronic tag knows the channel status, so as to take effective measures to alleviate the above-mentioned channel conflict problem in the field of wireless communication; at the same time, reduce the amount of communication data of the reader

Method used

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  • Carrier monitoring multi-path access protocol in reader-based radio frequency identification
  • Carrier monitoring multi-path access protocol in reader-based radio frequency identification
  • Carrier monitoring multi-path access protocol in reader-based radio frequency identification

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The reader starts identification by sending a wireless signal "start identification" command, and divides the time into discrete time periods. In each time period, each electronic tag selects whether to compete for the channel through probability. Empty channel, available channel and conflicting channel represent no electronic tag competition, only one electronic tag for data transmission and multiple electronic tag competition. When only one electronic tag passes the lightweight data competition, the reader will notify the tag to continue sending (while other electronic tags stop sending), and the notified electronic tag will continue to send the remaining data.

[0026] The lightweight data of multiple electronic tags may cause conflicts. If a conflict occurs, the reader will broadcast it to the electronic tags after listening. All conflicting electronic tags ...

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Abstract

The invention relates to a carrier monitoring multi-path access protocol in reader-based radio frequency identification. The protocol is used for reducing communication consumption of a reader and conflict consumption of an electronic tag in the radio frequency identification technology, so that higher channel utilization rate and tag reading rate are achieved. In the invention, the reader is used for carrier monitoring; a channel condition is periodically broadcast to the electronic tag in a communication range through a small amount of code data, so that the aim of reducing channel occupancy rate is fulfilled; and the electronic tag determines the probability of competing a channel at the beginning of each period, so that the competition probability of the electronic tag is in the optimal state to fulfill the aim of reducing conflict probability. When the electronic tag competes the channel, lightweight data is transmitted first, and then heavyweight data is transmitted to finish communication after channel use right is obtained; and thus, the unnecessary channel occupancy caused by conflict is reduced and the electronic tag reading rate is increased.

Description

technical field [0001] The invention relates to a carrier sense multiple access protocol which can reduce reader communication consumption and electronic tag conflict consumption in a radio frequency identification (RFID, Radio Frequency IDentification) system, and improve channel utilization rate and electronic tag reading rate. The invention belongs to the field of radio frequency identification technology and wireless communication technology. Background technique [0002] Radio frequency identification (hereinafter referred to as RFID) technology is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. RFID technology has the characteristics of identifying high-speed moving objects and identifying multiple tags at the same time. RFID technology is widely used in various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 康磊伍楷舜倪明选
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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