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Method and system for realizing time synchronization

A technology of time synchronization and time difference, applied in the field of communication, can solve problems such as inability to satisfy user-side time synchronization, inability to provide time synchronization, inability to obtain accurate time, etc.

Inactive Publication Date: 2011-01-12
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ONU can obtain a high-precision clock by recovering the line clock, it cannot obtain precise time
[0006] In the GPON system, the user end may have high-precision time synchronization requirements. However, under the existing technology, the GPON system can only provide high-precision clocks, but cannot provide time synchronization, so it cannot meet the time synchronization requirements of the user end. need

Method used

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  • Method and system for realizing time synchronization
  • Method and system for realizing time synchronization
  • Method and system for realizing time synchronization

Examples

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Embodiment Construction

[0026] Embodiments of the present invention provide a method and system for realizing time synchronization, which are used to realize time synchronization between ONU and OLT in a GPON system.

[0027] The technical solutions provided by the embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0028] see figure 2 A method for implementing time synchronization provided by an embodiment of the present invention generally includes steps:

[0029] S101. When the downstream frame that needs to be sent to the ONU is a specific downstream frame, the OLT records the sending time of the specific downstream frame, and notifies the ONU of the sending time of the specific downstream frame.

[0030] S102. When the downlink frame from the OLT to be received is a specific downlink frame, the ONU records the receiving time of the specific downlink frame.

[0031] S103. The ONU determines the time difference between itself and the OLT...

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Abstract

The invention discloses a method and a system for realizing time synchronization, which are used for realizing the time synchronization of an optical network unit ONU and an optical line terminal OLT in a GPON system. The method for realizing the time synchronization comprises the following steps that: when a lower voice frame which is needed to be sent to the ONU is a specific lower voice frame, the OLT records the sending moment of the specific lower voice frame and informs the ONU of the sending moment of the specific lower voice frame; when a lower voice frame which is needed to be received and is from the OLT is a specific lower voice frame, the ONU records the receiving moment of the specific lower voice frame; and the ONU determines the time difference of the ONU and the OLT according to the sending moment and the receiving moment of the specific lower voice frame and the link time delay of the ONU and the OLT, and adjusts a local clock according to the time difference to realize the time synchronization of the ONU and the OLT.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and system for realizing time synchronization. Background technique [0002] Gigabit-Capable Passive Optical Network (GPON, Gigabit-Capable Passive Optical Network) is a passive access technology network using a point-to-multipoint topology. Optical Network Unit (ONU) and Optical Distribution Network (ODN), such as figure 1 shown. Among them, the ODN does not contain any active electronic devices and electronic power sources, and is composed of optical fibers and optical splitters / combiners. [0003] GPON generally adopts wavelength division multiplexing for uplink and downlink to realize single-fiber bidirectional transmission, adopts time division multiplexing (TDM, Time Division Multiplexing) broadcast mode in the downlink direction, and adopts time division multiple access (TDMA, Time Division Multiple Access) way in the uplink direction , can be fl...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04J3/06
Inventor 高峰谢子阳翟宇坤潘晨聪
Owner DATANG MOBILE COMM EQUIP CO LTD
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