WO2003075448A3 - Method and system for calibrating an oscillator circuit using a network based time reference - Google Patents

Method and system for calibrating an oscillator circuit using a network based time reference Download PDF

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Publication number
WO2003075448A3
WO2003075448A3 PCT/US2003/001290 US0301290W WO03075448A3 WO 2003075448 A3 WO2003075448 A3 WO 2003075448A3 US 0301290 W US0301290 W US 0301290W WO 03075448 A3 WO03075448 A3 WO 03075448A3
Authority
WO
WIPO (PCT)
Prior art keywords
clock
time stamp
networked
arrangement
clock circuit
Prior art date
Application number
PCT/US2003/001290
Other languages
French (fr)
Other versions
WO2003075448A2 (en
Inventor
Barry Cahill-O'brien
Robert V Dusenberry
Original Assignee
Itron Inc
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 Itron Inc filed Critical Itron Inc
Priority to AU2003237773A priority Critical patent/AU2003237773A1/en
Publication of WO2003075448A2 publication Critical patent/WO2003075448A2/en
Publication of WO2003075448A3 publication Critical patent/WO2003075448A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0083—Signalling arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]

Abstract

A method and system of compensating for reference frequency drift utilizes time stamps from a networked reference clock to adjust a local crystal oscillator (104) of a communications device (100). In an example embodiment, a microprocessor arrangement (106) of the communications device obtains a synchronization time stamp from a networked clock arrangement (150 or 160) and synchronizes the local oscillator clock and a clock circuit of the microprocessor with the time stamp. After a predetermined time duration has transpired, a calibration time stamp is obtained from the network clock and the difference between the calibration time stamp and the current time of the clock circuit is extracted. The clock circuit and the networked clock arrangement are than synchronized and the local crystal oscillator is adjusted for crystal aging as a function of the difference between the calibration time stamp and the current time of the clock circuit.
PCT/US2003/001290 2002-02-14 2003-01-16 Method and system for calibrating an oscillator circuit using a network based time reference WO2003075448A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003237773A AU2003237773A1 (en) 2002-02-14 2003-01-16 Method and system for calibrating an oscillator circuit using a network based time reference

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/076,299 2002-02-14
US10/076,299 US6639957B2 (en) 2002-02-14 2002-02-14 Method and system for calibrating an oscillator circuit using a network based time reference

Publications (2)

Publication Number Publication Date
WO2003075448A2 WO2003075448A2 (en) 2003-09-12
WO2003075448A3 true WO2003075448A3 (en) 2004-02-26

Family

ID=27660209

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/001290 WO2003075448A2 (en) 2002-02-14 2003-01-16 Method and system for calibrating an oscillator circuit using a network based time reference

Country Status (3)

Country Link
US (1) US6639957B2 (en)
AU (1) AU2003237773A1 (en)
WO (1) WO2003075448A2 (en)

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Also Published As

Publication number Publication date
US20030152177A1 (en) 2003-08-14
AU2003237773A8 (en) 2003-09-16
WO2003075448A2 (en) 2003-09-12
US6639957B2 (en) 2003-10-28
AU2003237773A1 (en) 2003-09-16

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