WO2001022377B1 - Randomization of transmit time - Google Patents

Randomization of transmit time

Info

Publication number
WO2001022377B1
WO2001022377B1 PCT/US2000/023000 US0023000W WO0122377B1 WO 2001022377 B1 WO2001022377 B1 WO 2001022377B1 US 0023000 W US0023000 W US 0023000W WO 0122377 B1 WO0122377 B1 WO 0122377B1
Authority
WO
WIPO (PCT)
Prior art keywords
tag
pseudo
random
board
signal
Prior art date
Application number
PCT/US2000/023000
Other languages
French (fr)
Other versions
WO2001022377A1 (en
Inventor
David Livingstone Richardson
Gabor Elek
Original Assignee
Northrop Grumman Corp
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 Northrop Grumman Corp filed Critical Northrop Grumman Corp
Priority to EP00957658A priority Critical patent/EP1218866A4/en
Priority to JP2001525663A priority patent/JP2003510866A/en
Publication of WO2001022377A1 publication Critical patent/WO2001022377A1/en
Publication of WO2001022377B1 publication Critical patent/WO2001022377B1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0716—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
    • G06K19/0717—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being capable of sensing environmental conditions such as temperature history or pressure
    • 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
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1427—Mechanical actuation by lifting or attempted removal of hand-portable articles with transmitter-receiver for distance detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2451—Specific applications combined with EAS
    • G08B13/2462—Asset location systems combined with EAS
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2482—EAS methods, e.g. description of flow chart of the detection procedure
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2488—Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0227—System arrangements with a plurality of child units
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/007—Details of data content structure of message packets; data protocols
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

Abstract

The present invention discloses an apparatus for randomizing the transmit time in a tag RFID communication system. The CRC calculation is implemented through the use of software stored in the system microprocessor (10) and the calculations vary upon a plurality of dynamic inputs including temperature and motion of the tag (4). The tag apparatus of the present invention includes temperature (16) and motion monitors (14) for monitoring the environmental conditions of the tag (4). A microprocessor (10) in communication with the sensor calculates the next pseudo-random transmission based upon the dynamic inputs. A transmitter (12) transmits a signal to the system monitor.

Claims

AMENDED CLAIMS[received by the International Bureau on 16 March 2001 (16.03.01); original claims 1, 5 and 10 amended; remaining claims unchanged (2 pages)]
1. (Amended) A method of producing a pseudo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including at least one onboard environmental sensor, an on-board pseudo-random transmit time calculation circuit and an on-board RF-transmitter, said method comprising the steps of: a) monitoring environmental conditions of a tag through the onboard sensor; b) calculating a pseudo-random transmit time based upon monitored environmental conditions through the on-board calculation circuit; and c) transmitting a signal at the calculated pseudo-random transmit time through the on-board RF transmitter.
2. The method of producing a pseudo-random RF signal of Claim 1 further comprising the step of repeating the steps a-c continuously.
3. The method of producing a pseudo-random RF signal of Claim 1 wherein the step of monitoring the environmental conditions of the tag includes the monitoring of the tag temperature.
4. The method of producing a pseudo-random RF signal of Claim 1 outlining the step of monitoring the environmental conditions of the tag includes the monitoring of the tag motion.
5. (Amended) A method for producing a pseudo-random RF signal in a tag for use in a multiple tag monitoring system, each of said tags including an on-board pseudo-random transmit time calculation circuit and an on-board data storage memory, said method comprising the steps of: a) calculating a pseudo-random transmit time through an on-board calculation circuit based upon the following: i) data stored in the on-board memory as user defined fields; ii) data stored in the on-board memory as fixed fields; and iii) data stored in the on-board memory as dynamic fields.
6. The method for producing a pseudo-random RF signal ofQai 5 further comprising repeating the steps of Claim 5 continuously. -1 5-
7. The method for producing a pseudo-random RF signal of Claim 5 wherein the dynamic field includes data indicating monitored environmental conditions of the tag.
8. The method for producing a pseudo-random RF signal of Claim 7 wherein the monitored environmental conditions include the temperature of the tag.
9. The method for producing a pseudo-random RF signal of Claim 7 wherein the monitored environmental conditions include the motion of the tag.
10. (Amended) A tag for use in a radio frequency identification system comprising: a) at least one on-board sensor for monitoring the environmental conditions of the tag; b) an on-board microprocessor for receiving data from the sensor to calculate a next pseudo-random transmission time of the tag; and c) an on-board transmitter for transmitting a signal at the calculated pseudo-random transmit time.
11. The tag of Claim 10 wherein said sensor is a temperature sensor.
12. The tag of Claim 10 wherein said sensor is a motion sensor.
13. The tag of Claim 10 farther comprising a timing circuit in communication with said microprocessor for receiving the calculated transmit time and for initializing said transmitter at the calculated transmit time,
14. The tag of Claim 10 wherein said tag includes a power source for operation of the microprocessor, sensor and transmitter of said tag.
15. The tag of Claim 10 wherein said tag includes a random access memory (RAM).
16. The tag of Claim 10 wherein said tag includes a non- volatile memory.
PCT/US2000/023000 1999-09-23 2000-08-22 Randomization of transmit time WO2001022377A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00957658A EP1218866A4 (en) 1999-09-23 2000-08-22 Randomization of transmit time
JP2001525663A JP2003510866A (en) 1999-09-23 2000-08-22 Transmission time randomization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/401,248 1999-09-23
US09/401,248 US6297734B1 (en) 1999-09-23 1999-09-23 Randomization of transmit time

Publications (2)

Publication Number Publication Date
WO2001022377A1 WO2001022377A1 (en) 2001-03-29
WO2001022377B1 true WO2001022377B1 (en) 2001-05-10

Family

ID=23586980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/023000 WO2001022377A1 (en) 1999-09-23 2000-08-22 Randomization of transmit time

Country Status (4)

Country Link
US (1) US6297734B1 (en)
EP (1) EP1218866A4 (en)
JP (1) JP2003510866A (en)
WO (1) WO2001022377A1 (en)

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Also Published As

Publication number Publication date
WO2001022377A1 (en) 2001-03-29
EP1218866A4 (en) 2004-09-29
EP1218866A1 (en) 2002-07-03
JP2003510866A (en) 2003-03-18
US6297734B1 (en) 2001-10-02

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