Method and device for transmitting information from reader-writer to label

A reader and tag technology, applied in the field of communication, can solve the problem of synchronization between reader and tag, and achieve the effect of self-calibration, low bit error rate and area saving.

Active Publication Date: 2011-09-14
中国电子技术标准化研究所 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for transmitting information from a reader to a tag, so as to solve the synchronization problem from the reader to the tag

Method used

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  • Method and device for transmitting information from reader-writer to label
  • Method and device for transmitting information from reader-writer to label
  • Method and device for transmitting information from reader-writer to label

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Embodiment Construction

[0025]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0026] figure 1 For a schematic diagram of the communication system for RFID readers and tags, please refer to figure 1 , the reader-writer 11 transmits an ACK modulation signal, and when one or more tags 12 enter the working range of the reader-writer, it can receive the radio-frequency signal emitted by the reader-writer 11, and can return the required information according to the received command. Data information; the reader 11 transmits the data information to the computer data management system 13 after receiving the data information.

[002...

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Abstract

The embodiment of the invention provides a method and a device for transmitting information from a reader-writer to a label. The method comprises the following steps of: transmitting a continuous high-level radio frequency carrier with a certain length; if an identification code is received from the label, generating a frame synchronization sequence, and transmitting the frame synchronization sequence to the label, wherein the frame synchronization sequence comprises a delimiter representative of an initial point of the frame synchronization sequence, two calibration symbols for calibrating reference frequency, and data information; if a receiving identifier returned by the label is received, generating a base band command according to an instruction of a background control system, codingthe base band command, and transmitting a carrier signal comprising the frame synchronization sequence and the coded base band command; and if a synchronization establishment identifier returned by the label is received, determining that the establishment of synchronous communication with the label is finished. By the method and the device, the self-calibration of the reference frequency can be realized, thereby reducing the power consumption of a chip.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for transmitting information from a reader to a tag. Background technique [0002] The radio frequency identification (RFID, Radio Frequency Identification) technology in the field of communication is an automatic identification technology that uses radio frequency for long-distance communication to identify items. This technology is compatible with today's digital mobile business, and can realize automatic identification and remote real-time monitoring and management. It is one of the popular technologies in contemporary information technology. When working, the RFID tag is installed on the item that needs to be authenticated, and the tag sends the identity information about the item to the receiving device through electromagnetic waves. The RFID system can track and manage almost all physical objects in this way. RFID has broad application prospects in many fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26G06K17/00
Inventor 耿力高林冯敬袁理刘文莉宋继伟刘伟峰沈红伟兰天
Owner 中国电子技术标准化研究所
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