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RFID protocol

a technology of rfid and air protocol, applied in the field of improved, can solve the problems of large interference, complex algorithms for managing tag populations, and the inability of readers to share spectrum channels or even operate in adjacent spectrum channels, so as to improve the handling of fast-moving tagged objects and reduce interferen

Active Publication Date: 2016-05-05
ICOMP TECH DALIAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances the handling of fast-moving tagged objects, reduces interference, and allows for multiple readers to operate in proximity without spectrum channel limitations, improving scalability and data handling speed.

Problems solved by technology

RTF protocols such as ISO / IEC 18000-63 typically have complex algorithms for managing tag populations.
It has, however, a number of drawbacks:The reader-driven RTF anti-collision process creates a large amount of interference.
As a result, readers cannot share spectrum channels or even operate in adjacent spectrum channels.
This puts an upper limit on the total throughput that can be achieved at a single installation.The RTF protocol has difficulty handling fast moving tagged objects.
In addition, spectrum regulations and available channel bandwidth limit the baud rate that can be used for the forward link, placing a further limit on the speed that tagged objects can move past an RTF reader.

Method used

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Examples

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Embodiment Construction

[0024]In accordance with an exemplary embodiment of the claimed invention, the ISO / IEC 18000-63 protocol is modified and improved in order to add a TTO capability to this protocol. The unmodified protocol has the drawbacks typical of an RTF protocol, namely:[0025]Reader pollution: Excessive reader modulation during the anti-collision phase interferes with other readers, tags and systems.[0026]Low speed: The need to poll, coupled with spectrum limited baud rates on the forward link, makes the protocol inherently slow.[0027]Lack of scalability: Readers have to operate in their own spectrum channels and have to be time-multiplexed where spectrum is limited. Only a small number of readers can be operated simultaneously in proximity.[0028]Tag sensitivity is affected negatively by the modulation of the forward link

[0029]The protocol can be enhanced through the addition of TTO capabilities. This will have the following benefits:[0030]Ability to deploy and run larger numbers of readers simu...

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Abstract

A method of adding TTO functionality to an RTF RFID air protocol, such as ISO / IEC 18000-63 and EPC C1G2 protocol, Chinese GB / T 29768-2013. The starting wait state is changed after power-up of the RTF protocol to a TTO state where the tag automatically transmits an ID or an ID plus additional data at intervals to a reader while still waiting for possible RTF commands. A new command is added that enables the reader to obtain a handle from the tag directly from the TTO state to access the tag in an identical manner to the RTF access. The TTO functionality is as defined by the ISO / IEC 1800-64 protocol or IP-X protocol.

Description

RELATED APPLICATIONS[0001]This application is a §371 application from PCT / CN2014 / 073822 filed Mar. 21, 2014, which claims priority from Chinese Patent Application No. 201310447063.7 filed Sep. 27, 2013, each of which is herein incorporated by reference in its entiretyTECHNICAL FIELD OF THE INVENTION[0002]This invention relates to an improved air protocol for RFID systems.BACKGROUND OF THE INVENTION[0003]There are radio frequency identification (RFID) systems which include at least one RFID reader, also known as an interrogator, and a plurality of electronic transponders, also known as RFID tags. The RFID tags are typically passive, being energized by a broadcast radio frequency (RF) signal or power-up beam from the interrogator, but can also be active or semi-active, having an additional power source like a battery. The reader communicates with the tags by modulating commands and data onto the power-up beam (the so-called “forward link”), while the tags communicate with the reader b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K7/10
CPCG06K7/10227G06K7/10297G06K19/0712G06K19/0723
Inventor VAN EEDEN, HENDRIK LODEWYKZHANG, CALVINTIAN, TAYLORQIU, YOUBONXU, HUNTER
Owner ICOMP TECH DALIAN