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RFID system and method for operating the system under energy-saving mode

A mode, sleep mode technology, applied in the field of RFID system, can solve the problem of wasting battery energy and so on

Inactive Publication Date: 2008-02-13
THE CHINESE UNIVERSITY OF HONG KONG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although this wake-and-wait scheme can save some battery power, the tag will waste battery power during period 123, where period 123 is the interval between the end of listen mode 122 and the beginning of period 124

Method used

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  • RFID system and method for operating the system under energy-saving mode
  • RFID system and method for operating the system under energy-saving mode
  • RFID system and method for operating the system under energy-saving mode

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Embodiment Construction

[0027] FIG. 2 is a process sequence diagram of a wake-up and listen scheme of an RFID system according to an embodiment of the present invention. For ease of illustration, an embodiment comprising a reader and a tag is shown. However, those of ordinary skill in the art should appreciate that the inventive concept can be applied to systems comprising more than one reader and more than one tag.

[0028] As shown in FIG. 2 , the tag 220 is in the sleep mode and the listening mode alternately as usual. The reader 210 sends a wake-up signal 211 and valid data 213 when switched on. In contrast to the prior art, according to the invention, the wake-up signal 211 is modulated by a plurality of time markers 212 . In FIG. 2, (N+1) time markers 0, 1, 2...K...N are marked in the wake-up signal 211, where N is 0 or a positive integer. Thus, the wake-up signal consists of N+1 consecutive time pulses (hereinafter referred to as "time markers"). The modulation scheme can be amplitude modu...

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Abstract

A method of operating an RFID system and an RFID system in a power-saving mode are disclosed. In one embodiment, the system comprises at least one reader and at least one tag. The at least one reader may transmit a wake-up signal to the at least one tag when turning on, and the at least one tag stays alternatively in a sniff mode and a sleep mode at an alternative period before receiving the wake-up signal. The method may comprise modulating the wake-up signal by using N time markers.

Description

technical field [0001] The present invention relates generally to RFID systems comprising one or more readers and one or more tags or transponders, and more particularly to an RFID system and method of operating an RFID system in a power saving mode. Background technique [0002] Energy saving is one of the most salient issues among various issues for a viable business solution. Every active tag needs to be powered by a battery, and all communication between the tag and the reader consumes power from the battery. Most applications of active RFID systems require a long read / write distance between the reader and the tag. The "longer range" means that the tag must be highly sensitive in order to be able to receive signals from and transmit signals to the reader. [0003] In order to save energy, the fundamental method is to minimize the operation time of the label. In the actual active RFID implementation, the tag is alternately in the listening mode and the sleeping mode mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
CPCG06K7/0008G06K19/0712G06K19/0723G06K19/0707
Inventor 吴克利王洪洋韦大成尹应增邓伟昌
Owner THE CHINESE UNIVERSITY OF HONG KONG
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