WO2016184225A1 - Procédé et dispositif d'envoi de message de synchronisation temporelle - Google Patents

Procédé et dispositif d'envoi de message de synchronisation temporelle Download PDF

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Publication number
WO2016184225A1
WO2016184225A1 PCT/CN2016/075971 CN2016075971W WO2016184225A1 WO 2016184225 A1 WO2016184225 A1 WO 2016184225A1 CN 2016075971 W CN2016075971 W CN 2016075971W WO 2016184225 A1 WO2016184225 A1 WO 2016184225A1
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WO
WIPO (PCT)
Prior art keywords
time synchronization
time
network unit
optical network
line terminal
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Application number
PCT/CN2016/075971
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English (en)
Chinese (zh)
Inventor
黄健
黄文杰
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中兴通讯股份有限公司
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Publication of WO2016184225A1 publication Critical patent/WO2016184225A1/fr

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems

Definitions

  • the present application relates to, but is not limited to, the field of optical communication technologies, and in particular, to a time synchronization message sending method and apparatus.
  • Optical access technology can provide large bandwidth and high reliability.
  • Passive Optical Network PON
  • PON Passive Optical Network
  • PON technology has the full service access capability of data, voice and Time Division Multiplex (TDM) to meet the evolving wireless access requirements.
  • TDM Time Division Multiplex
  • the convergence characteristics of PON can make the whole network layer clear, convenient construction and efficient management.
  • the time synchronization method on the PON network is: an optical line terminal (Optical Line Terminal, OLT for short), an external clock (for example, a GPS clock) signal or a slave network precise timing protocol (Precision Time Protocol, PTP for short).
  • OLT optical Line Terminal
  • PTP Precision Time Protocol
  • the standard G.988.9.12.2 specifies the time synchronization message sent by the OLT to the ONU, including two parts.
  • the first part (4 bytes) is super frame N, that is, the super frame counter, the second part (10 bytes).
  • Is TstampN that is, timestamp.
  • the ONU receives the Nth super frame, the local time is generated according to the synchronization mechanism of the PON system itself according to the received time synchronization message (N, TstampN), and the time synchronization is achieved.
  • the OLT controls the timing of sending time synchronization messages to the ONU.
  • the standard G984.3Amd2 is recommended to be synchronized at least once every 24 hours and once when the ONU is activated for the first time.
  • Synchronize messages by sending time In order to ensure continuous synchronization of the OLT and ONU time, generally, in a fixed time Synchronize messages by sending time.
  • the ONU recovery clock and the OLT clock information are bound to be inconsistent. In this way, the time between the OLT and the ONU is not synchronized, which seriously affects services such as TDM that rely on the time synchronization mechanism on the PON. If the transmission interval is reduced indefinitely, there will be a large number of OMCI (ONU Management and Control Interface) message interactions, especially for the OLT, a lot of meaningless OMCI messages will be sent.
  • OMCI ONU Management and Control Interface
  • the above control method for time synchronization message transmission has inevitable defects and limitations in implementation, especially in the case of drift, error or other loss of lock of the OLT clock source, OLT The clock may not be synchronized with the ONU for a long period of time and no improvement is needed.
  • the embodiment of the invention provides a method and a device for transmitting a time synchronization message, which can ensure the time synchronization of an optical line terminal (OLT) and an optical network unit (ONU) in a passive optical network system.
  • OLT optical line terminal
  • ONU optical network unit
  • the embodiment of the invention provides a time synchronization message sending method, which is applied to an optical line terminal, and the method includes:
  • a time synchronization message is sent to the optical network unit.
  • the detecting a time synchronization signal between the optical line terminal and the optical network unit includes:
  • the time synchronization signal carries clock source information of the optical line terminal, and the clock source information includes a super frame number N and a time stamp TstampN.
  • the detecting, by using the first time interval, the time synchronization signal between the optical line terminal and the optical network unit includes:
  • N2 and N1 are super frame numbers, and TstampN2 and TstampN1 are time stamps;
  • T diff
  • the method further includes:
  • the method further includes:
  • a time synchronization message is sent to the optical network unit when the optical network unit is first activated.
  • the embodiment of the invention provides a time synchronization message sending device, which is applied to an optical line terminal, and includes:
  • the detecting module is configured to: detect a time synchronization signal between the optical line terminal and the optical network unit;
  • the message sending module is configured to: when the deviation of the time synchronization signal exceeds a threshold, send a time synchronization message to the optical network unit.
  • the detection module is set to:
  • the time synchronization signal carries clock source information of the optical line terminal, and the clock source information includes a super frame number N and a time stamp TstampN.
  • the detecting module detects the time synchronization signal between the optical line terminal and the optical network unit at the first time interval by:
  • N2 and N1 are super frame numbers, and TstampN2 and TstampN1 are time stamps;
  • T diff
  • the message sending module is further configured to: send a time synchronization message to the optical network unit at a second time interval; wherein the second time interval is greater than the first time interval.
  • the message sending module is further configured to: send a time synchronization message to the optical network unit when the optical network unit is activated for the first time.
  • an embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, and the time synchronization message sending method is implemented when the computer executable instructions are executed.
  • a time synchronization message sending method and apparatus when detecting that a deviation of a time synchronization signal between an optical line terminal and an optical network unit exceeds a threshold, to an optical network
  • the unit sends a time synchronization message to ensure that the time of the optical line terminal (OLT) and the optical network unit (ONU) in the passive optical network system is continuously synchronized, and the OLT and the ONU are prevented from drifting, error or other loss of lock of the OLT clock source.
  • the clock cannot be kept synchronized for a long time because it waits for the next time synchronization message transmission cycle.
  • FIG. 1 is a flowchart of a method for sending a time synchronization message according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a time synchronization message sending apparatus according to an embodiment of the present invention
  • FIG. 3 is an information interaction diagram of a time synchronization message sending method according to an application example of an embodiment of the present invention.
  • an embodiment of the present invention provides a time synchronization message sending method, which is applied to an optical line terminal, and the method includes:
  • Step S10 detecting a time synchronization signal between the optical line terminal and the optical network unit
  • Step S20 Send a time synchronization message to the optical network unit when the deviation of the time synchronization signal exceeds a threshold.
  • the detecting a time synchronization signal between the optical line terminal and the optical network unit includes:
  • the time synchronization signal carries clock source information of the optical line terminal, and the clock source information includes a super frame number N and a time stamp TstampN.
  • the deviation of the time synchronization signal may be caused by a drift, error or other loss of lock of the clock source of the optical line terminal.
  • the time synchronization signal between the optical line terminal and the optical network unit is detected at the first time interval, including:
  • N2 and N1 are super frame numbers, and TstampN2 and TstampN1 are time stamps;
  • T diff
  • t 1/8000 seconds.
  • the method further includes:
  • the method further includes:
  • a time synchronization message is sent to the optical network unit when the optical network unit is first activated.
  • the second time interval can be set to be large, and the first time interval is set to be small (for example, the time of one superframe is separated).
  • the ONU does not wait for the transmission period of the second time interval, but synchronizes the signal deviation by every other time interval. Detect and quickly synchronize with the OLT.
  • This processing method not only reduces message interaction, rationally utilizes resources, but also ensures that the time between the OLT and the ONU is consistent.
  • an embodiment of the present invention provides a time synchronization message sending apparatus, which is applied to an optical line terminal, and includes:
  • the detecting module is configured to: detect a time synchronization signal between the optical line terminal and the optical network unit;
  • the message sending module is configured to: when the deviation of the time synchronization signal exceeds a threshold, send a time synchronization message to the optical network unit.
  • the detection module is set to:
  • the time synchronization signal carries clock source information of the optical line terminal, and the clock source information includes a super frame number N and a time stamp TstampN.
  • the deviation of the time synchronization signal may be caused by a drift, error or other loss of lock of the clock source of the optical line terminal.
  • the detecting module detects the time synchronization signal between the optical line terminal and the optical network unit at the first time interval by:
  • N2 and N1 are super frame numbers, and TstampN2 and TstampN1 are time stamps;
  • T diff
  • the message sending module is further configured to: send the optical network unit to the optical network unit at a second time interval. Sending a time synchronization message; wherein the second time interval is greater than the first time interval.
  • the message sending module is further configured to: send a time synchronization message to the optical network unit when the optical network unit is activated for the first time.
  • a time synchronization method between an OLT and an ONU includes the following steps:
  • Step S101 When the OLT arrives at the fixed transmission period Tcycle (the time synchronization message is sent to the ONU), the OLT calculates the timestamp TstampN1 corresponding to the arrival of the N1 superframe to the ONU; the OLT sends the N1-X super to the ONU.
  • the super frame is N1-X
  • the time synchronization message is sent to the ONU through the OMCI message, where the clock source information of the OLT (N1, TstampN1) is carried;
  • Step S102 The OLT sends the N1th super frame to the ONU; when the N1 super frame arrives, the ONU recovers the time information according to the previously received (N1, TstampN1);
  • Step S103 When the OLT sends the N2-X super frames N2-X to the ONU, according to the clock source information (N2, TstampN2) of the time synchronization message that should be sent to the ONU, and the last time sent to the optical network.
  • the clock source information (N1, TstampN1) of the time synchronization message of the unit determines the deviation amount T diff of the current time synchronization signal. If the T diff exceeds the threshold, the time synchronization message is sent to the ONU through the OMCI message, where the clock source information of the OLT is carried ( N2, TstampN2);
  • Step S104 The OLT sends the N2th super frame to the ONU; when the N2th super frame arrives, the ONU recovers the time information according to the previously received (N2, TstampN2);
  • Step S105 When the next fixed transmission period Tcycle arrives, the OLT sends a time synchronization message to the ONU through the OMCI message when the N3-X super frame N3-X is sent to the ONU, where the OLT carries the clock source information of the OLT ( N3, TstampN3);
  • Step S106 The OLT sends the N3th super frame to the ONU; when the N3th super frame arrives, the ONU recovers the time information according to the previously received (N3, TstampN3).
  • the method and device for transmitting a time synchronization message provided by the foregoing embodiment can ensure that a time synchronization message is sent to the optical network unit when the deviation of the time synchronization signal between the optical line terminal and the optical network unit exceeds a threshold.
  • Optical line termination (OLT) and passive optical network systems The time of the optical network unit (ONU) is continuously synchronized to avoid drift, error or other loss of lock of the OLT clock source. The OLT and the ONU cannot wait for the longer time clock to keep synchronizing because they wait for the next time synchronization message transmission period.
  • an embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, and the time synchronization message sending method is implemented when the computer executable instructions are executed.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. Instructions to achieve their corresponding functions. This application is not limited to any specific combination of hardware and software.
  • the embodiment of the invention provides a method and a device for transmitting a time synchronization message, which can ensure that the time of the OLT and the ONU in the passive optical network system is continuously synchronized, and the OLT and the ONU are prevented from drifting, error or other loss of lock of the OLT clock source.
  • the clock cannot be kept synchronized for a long time because it waits for the next time synchronization message transmission cycle.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé permettant d'envoyer un message de synchronisation temporelle, qui est appliqué à un terminal de ligne optique. Le procédé comprend les étapes consistant à : détecter un signal de synchronisation temporelle entre un terminal de ligne optique et une unité de réseau optique ; et lorsque l'écart du signal de synchronisation temporelle dépasse une valeur de seuil, envoyer un message de synchronisation temporelle à l'unité de réseau optique. Le procédé peut assurer que le temps d'un terminal de ligne optique (OLT) et le temps d'une unité de réseau optique (ONU) soient synchrones en continu dans un système de réseau optique passif. La présente invention concerne également un dispositif d'envoi d'un message de synchronisation temporelle.
PCT/CN2016/075971 2015-05-21 2016-03-09 Procédé et dispositif d'envoi de message de synchronisation temporelle WO2016184225A1 (fr)

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CN201510264092.9A CN106301646B (zh) 2015-05-21 2015-05-21 一种时间同步消息发送方法和装置
CN201510264092.9 2015-05-21

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CN110995387B (zh) * 2019-11-28 2021-05-25 广东邮电职业技术学院 一种gpon网络承载高精度时钟的实现方法
CN111787013B (zh) * 2020-07-03 2022-02-25 中国电子科技集团公司第三十研究所 一种光纤时间同步***的攻击监测装置与方法

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