METHOD OF PROVIDING A PATH DELAY ASYMMETRY FOR TIME SYNCHRONIZATION BETWEEN A MASTER AND A SLAVE CLOCK ACROSS A COMMUNICATION NETWORK

Title:

METHOD OF PROVIDING A PATH DELAY ASYMMETRY FOR TIME SYNCHRONIZATION BETWEEN A MASTER AND A SLAVE CLOCK ACROSS A COMMUNICATION NETWORK

Document Type and Number:

WIPO Patent Application WO/2012/110109

Kind Code:

A3

Abstract:

A method 10 of providing a path delay asymmetry for time synchronization between a master clock at a first client node and a slave clock at a second client node across a server communications network. The method comprises: mapping a first time protocol signal (TPS) carrying master clock time protocol data onto a first transmission signal, determining a forward mapping delay, dmf, and providing dmf to a path delay asymmetry calculation element 12; mapping a second TPS carrying slave clock time protocol data onto a second transmission signal, determining a reverse mapping delay, dmr, and providing the dmr to the path delay asymmetry calculation element 14; applying FEC to the first transmission signal, determining a forward FEC delay, dfecf, and providing the dfecf to the path delay asymmetry calculation element 16; applying FEC to the second transmission signal, determining a reverse FEC delay, dfecr, and providing dfecr to the path delay asymmetry calculation element 18; calculating a path delay asymmetry in dependence on dmf, dmr, dfecf and dfecr 20; and providing the path delay asymmetry to a time protocol client at the second client node 22.

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Inventors:

RUFFINI STEFANO (IT)
BOTTARI GIULIO (IT)

Application Number:

PCT/EP2011/056627

Publication Date:

June 25, 2015

Filing Date:

April 27, 2011

Export Citation:

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Assignee:

ERICSSON TELEFON AB L M (SE)
RUFFINI STEFANO (IT)
BOTTARI GIULIO (IT)

International Classes:

H04L1/00; H04J3/06

Domestic Patent References:

WO2011017867A1

2011-02-17

Other References:

ANONYMOUS ED - ANONYMOUS: "IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems; IEEE Std 1588-2008 (Revision of IEEE Std 1588-2002)", 24 July 2008, IEEE STANDARD; [IEEE STANDARD], IEEE, PISCATAWAY, NJ, USA, PAGE(S) 1 - 269, ISBN: 978-0-7381-5400-8, XP002588173
JUNFANG WANG FIBERHOME TECHNOLOGIES GROUP P R CHINA LIANG MEI FIBERHOME TECHNOLOGIES GROUP P R CHINA CHANGJUN HU CHINA ACADEMY OF: "1588v2 transmission by OSC over OTN", ITU-T DRAFTS ; STUDY PERIOD 2009-2012, INTERNATIONAL TELECOMMUNICATION UNION, GENEVA ; CH, vol. Study Group 15 ; 13, 11 October 2010 (2010-10-11), pages 1 - 3, XP017448560
CHONGNING NA ET AL: "Synchronization Performance of the Precision Time Protocol", INFORMATION SCIENCES AND SYSTEMS, 2007. CISS '07. 41ST ANNUAL CON FERENCE ON, IEEE, PI, 1 October 2007 (2007-10-01), pages 25 - 32, XP031161274, ISBN: 978-1-4244-1063-7
DAVARI A OREN BROADCOM L MARTINI CISCO S: "Transporting PTP messages (1588) over MPLS Networks; draft-davari-tictoc-1588overmpls-00.txt", TRANSPORTING PTP MESSAGES (1588) OVER MPLS NETWORKS; DRAFT-DAVARI-TICTOC-1588OVERMPLS-00.TXT, INTERNET ENGINEERING TASK FORCE, IETF; STANDARDWORKINGDRAFT, INTERNET SOCIETY (ISOC) 4, RUE DES FALAISES CH- 1205 GENEVA, SWITZERLAND, 23 September 2010 (2010-09-23), pages 1 - 13, XP015071277

Attorney, Agent or Firm:

CHISHOLM, Geoffrey (Unit 4Midleton Gate,Guildford Business Park, Guildford Surrey GU2 8SG, GB)

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