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AR021937A1 - A TELECOMMUNICATIONS NETWORK WITH SYNCHRONIZED WATCHES THROUGH THE USE OF SYSTEM FRAME NUMBERS AND A METHOD FOR SYNCHRONIZING THE CLOCKS OF A CELLULAR TELECOMMUNICATIONS NETWORK - Google Patents

A TELECOMMUNICATIONS NETWORK WITH SYNCHRONIZED WATCHES THROUGH THE USE OF SYSTEM FRAME NUMBERS AND A METHOD FOR SYNCHRONIZING THE CLOCKS OF A CELLULAR TELECOMMUNICATIONS NETWORK

Info

Publication number
AR021937A1
AR021937A1 ARP990106592A ARP990106592A AR021937A1 AR 021937 A1 AR021937 A1 AR 021937A1 AR P990106592 A ARP990106592 A AR P990106592A AR P990106592 A ARP990106592 A AR P990106592A AR 021937 A1 AR021937 A1 AR 021937A1
Authority
AR
Argentina
Prior art keywords
system frame
clock
telecommunications network
clocks
configuration message
Prior art date
Application number
ARP990106592A
Other languages
Spanish (es)
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of AR021937A1 publication Critical patent/AR021937A1/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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H04B7/269—Master/slave synchronisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Multi Processors (AREA)

Abstract

Se describe una red de telecomunicaciones (18) que capitaliza el empleo de un numero de trama de sistema (SFN) para sincronizar multiples relojes de tiemporeal (206) provistos en uno o más nodos de la red. Las senales de trama de sistema (por ejemplo, pulsos) son distribuidas desde una fuente (210, 310) hacia losprocesadores (202) que tienen relojes esclavos (206s) que necesitan ser sincronizados con un reloj maestro. Un procesador maestro (202M, 302T) envía un mensajede configuracion de reloj (500) hacia los procesadores, el mensaje de configuracion de reloj incluye una hora de referencia del reloj maestro (506) y un numerode referencia de trama de sistema (504). Los procesadores receptores los cuales reciben el mensaje de configuracion dereloj vuelven a sincronizar susrespectivos relojes esclavos usando la hora de referencia del reloj maestro y el numero de referencia de trama de sistema. En un modo, el mensaje deconfiguracion de reloj indica a los procesadores receptores a configurar sus respectivos relojes esclavos con la hora de referencia del reloj maestro tras laobtencion por los procesadores receptores del numero de referencia de trama de sistema. En otro modo, el mensaje de configuracion de reloj advierte a losprocesadores receptores de una hora real de reloj maestro en el numero de referncia de trama de sistema, por medio de lo cual habilita al procesador receptor acalcular una hora de reloj esclavo ajustada.A telecommunications network (18) is described that capitalizes on the use of a system frame number (SFN) to synchronize multiple real-time clocks (206) provided on one or more nodes of the network. System frame signals (e.g. pulses) are distributed from a source (210, 310) to processors (202) that have slave clocks (206s) that need to be synchronized with a master clock. A master processor (202M, 302T) sends a clock configuration message (500) to the processors, the clock configuration message includes a reference time of the master clock (506) and a system frame reference number (504). Receiving processors which receive the clock configuration message re-synchronize their respective slave clocks using the master clock reference time and the system frame reference number. In one mode, the clock configuration message instructs the receiving processors to configure their respective slave clocks with the reference time of the master clock after being obtained by the receiving processors of the system frame reference number. In another mode, the clock configuration message warns the receiving processors of a real master clock time in the system frame reference number, thereby enabling the receiving processor to calculate an adjusted slave clock time.

ARP990106592A 1998-12-18 1999-12-20 A TELECOMMUNICATIONS NETWORK WITH SYNCHRONIZED WATCHES THROUGH THE USE OF SYSTEM FRAME NUMBERS AND A METHOD FOR SYNCHRONIZING THE CLOCKS OF A CELLULAR TELECOMMUNICATIONS NETWORK AR021937A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IB9802073 1998-12-18
US44320899A 1999-11-18 1999-11-18

Publications (1)

Publication Number Publication Date
AR021937A1 true AR021937A1 (en) 2002-09-04

Family

ID=26318729

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP990106592A AR021937A1 (en) 1998-12-18 1999-12-20 A TELECOMMUNICATIONS NETWORK WITH SYNCHRONIZED WATCHES THROUGH THE USE OF SYSTEM FRAME NUMBERS AND A METHOD FOR SYNCHRONIZING THE CLOCKS OF A CELLULAR TELECOMMUNICATIONS NETWORK

Country Status (7)

Country Link
EP (1) EP1142176A2 (en)
JP (1) JP2002533990A (en)
CN (1) CN1335000A (en)
AR (1) AR021937A1 (en)
AU (1) AU3093700A (en)
CA (1) CA2353598A1 (en)
WO (1) WO2000038361A2 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364203B (en) 2000-06-27 2004-03-17 Nokia Mobile Phones Ltd Synchronisation
US7180915B2 (en) * 2001-12-21 2007-02-20 Nokia Corporation Apparatus, and an associated method, for facilitating synchronization in a wireless mesh network
EP1394641A1 (en) * 2002-09-02 2004-03-03 Siemens Aktiengesellschaft Method for transmitting an absolute time reference to a mobile station
DE102006019475B4 (en) 2006-04-26 2008-08-28 Nokia Siemens Networks Gmbh & Co.Kg Method for synchronizing modules of a base station
US7734264B2 (en) * 2006-08-29 2010-06-08 Qualcomm Incorporated System frame number (SFN) evaluator
US8958460B2 (en) 2008-03-18 2015-02-17 On-Ramp Wireless, Inc. Forward error correction media access control system
US8477830B2 (en) 2008-03-18 2013-07-02 On-Ramp Wireless, Inc. Light monitoring system using a random phase multiple access system
CN101364863B (en) * 2008-09-27 2011-11-02 华为技术有限公司 Time synchronizing method, apparatus and system for master, slave time clock side in synchronous network
US8363699B2 (en) 2009-03-20 2013-01-29 On-Ramp Wireless, Inc. Random timing offset determination
CN102545997B (en) * 2010-12-31 2014-12-10 中国移动通信集团公司 Method for determining system frame number, communication system and device
US10979279B2 (en) 2014-07-03 2021-04-13 International Business Machines Corporation Clock synchronization in cloud computing
EP3291616B1 (en) 2015-05-19 2020-04-29 Huawei Technologies Co., Ltd. Paging method, ue, base station, and core network apparatus
CN107396326A (en) * 2017-08-02 2017-11-24 北京北方烽火科技有限公司 A kind of method and master clock system for generating System Frame Number

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798650A (en) * 1972-10-02 1974-03-19 Bendix Corp Means for synchronizing clocks in a time ordered communications system
US4337463A (en) * 1980-08-22 1982-06-29 Control Data Corporation Time synchronization master station and remote station system
US4530091A (en) * 1983-07-08 1985-07-16 At&T Bell Laboratories Synchronization of real-time clocks in a packet switching system
GB2296166B (en) * 1994-11-29 1999-07-07 Plessey Telecomm Clock synchronisation

Also Published As

Publication number Publication date
EP1142176A2 (en) 2001-10-10
CA2353598A1 (en) 2000-06-29
JP2002533990A (en) 2002-10-08
WO2000038361A3 (en) 2000-11-02
CN1335000A (en) 2002-02-06
AU3093700A (en) 2000-07-12
WO2000038361A2 (en) 2000-06-29

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