MX9803671A - Enhanced detection of multiple data transmissions. - Google Patents

Enhanced detection of multiple data transmissions.

Info

Publication number
MX9803671A
MX9803671A MX9803671A MX9803671A MX9803671A MX 9803671 A MX9803671 A MX 9803671A MX 9803671 A MX9803671 A MX 9803671A MX 9803671 A MX9803671 A MX 9803671A MX 9803671 A MX9803671 A MX 9803671A
Authority
MX
Mexico
Prior art keywords
systems
transmitter
transmitters
intervals
frequency
Prior art date
Application number
MX9803671A
Other languages
Spanish (es)
Inventor
Hendrik Lodewyk Van Eeden
Jacob Pieter Laurens Cloete
Original Assignee
British Tech Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Tech Group filed Critical British Tech Group
Publication of MX9803671A publication Critical patent/MX9803671A/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
    • G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
    • G06K7/10059—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot transponder driven
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Near-Field Transmission Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The present invention provides method and apparatus which enhance the probability of identification of a number of transmitters (1), typically transponders, which are all transmitting data to a receiver. The invention is applicable to a number of systems including passive radio-frequency transponders systems, systems in which a number of self-powered transmitters must be identified by a receiver, or systems in which a number of transmitters broadcast using a randomly delayed "back-end and retry" algorithm. Each transmitter (1) is adapted to transmit at intervals and comprises means for generating transmissions, means for calculating the duration of the intervals between successive transmissions and means (20) for enabling the transmitter at random or pseudo-random intervals related to an operating frequency of local timing means (21). In passive RFID systems, the frequency of the local timing means is indeterminate, being unspecified until the transmitter is in operation.
MX9803671A 1995-11-09 1998-05-08 Enhanced detection of multiple data transmissions. MX9803671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA959519 1995-11-09

Publications (1)

Publication Number Publication Date
MX9803671A true MX9803671A (en) 1998-09-30

Family

ID=25585411

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9803671A MX9803671A (en) 1995-11-09 1998-05-08 Enhanced detection of multiple data transmissions.

Country Status (11)

Country Link
EP (1) EP0859989A1 (en)
JP (1) JP2000500932A (en)
KR (1) KR19990067371A (en)
CN (1) CN1201540A (en)
AR (1) AR002220A1 (en)
AU (1) AU7502396A (en)
BR (1) BR9611705A (en)
CA (1) CA2235585A1 (en)
MX (1) MX9803671A (en)
TW (1) TW383527B (en)
WO (1) WO1997017667A1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2333623B (en) * 1998-01-24 2000-04-26 Plessey Telecomm Transaction system
GB2335573B (en) 1998-03-18 2000-03-15 Univ Singapore An RF transponder identification system and protocol
GB2344257A (en) 1998-11-26 2000-05-31 Innovision Research And Techno Data communication apparatus and board game
JP3001570B1 (en) 1999-02-22 2000-01-24 埼玉日本電気株式会社 Adaptive antenna directivity control method and system
WO2000072461A1 (en) 1999-05-21 2000-11-30 Koerner Ralph J Identification system for monitoring the presence/absence of members of a defined set
AU2001264504A1 (en) * 2000-06-12 2001-12-24 Telefonaktiebolaget Lm Ericsson (Publ) Random identity management in scatternets
KR100486754B1 (en) * 2000-08-31 2005-05-03 매그나칩 반도체 유한회사 Radio Frequency Identification Tag System for preventing collision and collision preventing method thereof
FR2833724A1 (en) * 2001-12-13 2003-06-20 Canal Plus Technologies DIGITAL ELECTRONIC COMPONENT PROTECTED AGAINST ELECTRICAL AND / OR ELECTROMAGNETIC ANALYZES, ESPECIALLY IN THE FIELD OF CHIP CARDS
GB0213724D0 (en) * 2002-06-14 2002-07-24 Turner Christopher G G Electronic identification system
WO2006079972A1 (en) * 2005-01-31 2006-08-03 Nxp B.V. Improved communication between a communication station and data carriers
KR100749818B1 (en) * 2005-09-23 2007-08-17 한국전자통신연구원 Apparatus and Method for Reading Multi Tag in RFID System
US20070126556A1 (en) * 2005-12-07 2007-06-07 Kovio, Inc. Printed radio frequency identification (RFID) tag using tags-talk-first (TTF) protocol
EP1956513B1 (en) 2007-02-07 2010-06-02 Albis Technologies AG Transmission protocol opening a dynamic window for receiving data
CN101604021B (en) * 2009-07-09 2012-05-09 复旦大学 Location method and device of wireless radio frequency identification system
KR20120011602A (en) * 2010-07-29 2012-02-08 삼성테크윈 주식회사 Communication control method of RFID reader

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471345A (en) * 1982-03-05 1984-09-11 Sensormatic Electronics Corporation Randomized tag to portal communication system
FR2667715A1 (en) * 1990-10-09 1992-04-10 Gemplus Card Int METHOD AND DEVICE FOR INCREASING THE PROTECTION OF A MEMORY CARD.
US5530702A (en) * 1994-05-31 1996-06-25 Ludwig Kipp System for storage and communication of information

Also Published As

Publication number Publication date
CA2235585A1 (en) 1997-05-15
KR19990067371A (en) 1999-08-16
WO1997017667A1 (en) 1997-05-15
BR9611705A (en) 1999-02-23
JP2000500932A (en) 2000-01-25
AR002220A1 (en) 1998-03-11
AU7502396A (en) 1997-05-29
CN1201540A (en) 1998-12-09
EP0859989A1 (en) 1998-08-26
TW383527B (en) 2000-03-01

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