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Method, equipment and system for transmitting time synchronization information on ground

A technology for time synchronization and information synchronization, applied in the field of communication, can solve the problems of time synchronization failure of downstream devices and loss of time synchronization information, and achieve the effect of avoiding the loss of time synchronization information

Inactive Publication Date: 2012-06-06
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above time synchronization process, the time synchronization signal needs to be transmitted together with the service signal through the signal generator (upstream OTU) and receiver (downstream OTU). Once the signal generator and receiver fail, the time synchronization information will also be lost. Cause time synchronization failure of downstream devices

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  • Method, equipment and system for transmitting time synchronization information on ground
  • Method, equipment and system for transmitting time synchronization information on ground
  • Method, equipment and system for transmitting time synchronization information on ground

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Embodiment 1

[0027] Embodiment 1 of the present invention provides a method for transmitting time synchronization information on the ground, the method is applied to a system such as figure 2 shown, compared to figure 1 The time synchronization system shown also includes multiple OSC (Optical Supervisory Channel Optical Supervisory Channel) devices, and the time synchronization signal of the time source enters the upstream OTU and the OSC device at the same time. On the one hand, the time synchronization signal and the service signal pass through the upstream OTU to the downstream OTU On the other hand, the time synchronization signal is sent to the downstream OSC device through the upstream OSC device. When the time synchronization signal normally arrives at the downstream OTU, the downstream OTU sends time synchronization information to the device that needs time synchronization; when the time synchronization signal cannot reach the downstream OTU normally, the downstream OSC device sen...

Embodiment 2

[0032] Embodiment 2 of the present invention provides a method for transmitting time synchronization information on the ground. On the basis of Embodiment 1, an automatic conversion scheme of asymmetric error compensation value is further added. The terrestrial transmission system transfers time synchronization. The prerequisite is based on the symmetry of the uplink and downlink delays. However, the asymmetry of the actual network uplink and downlink delays (including the length of optical cables, node processing, and inconsistent lengths of pigtails, etc.) will introduce time deviations. The deviation is fixedly compensated.

[0033] Specifically, the time synchronization process of the master-slave clock is taken as an example to illustrate the function of the asymmetric error compensation value. The synchronization process includes:

[0034] The master clock sends a Sync (synchronization) message at time t1, and the Sync message includes the sending time t1.

[0035] Reco...

Embodiment 3

[0051] Embodiment 3 of the present invention provides a method for transmitting time synchronization information on the ground. On the basis of Embodiment 2, the network management device further stores the asymmetric error compensation value of the working path and the protection path, including the signals in the working path and the protection path Asymmetry error compensation value for transmission channel and optical monitoring channel. The working path is the optical fiber where the signal transmission channel and the optical monitoring channel in Embodiment 2 are located, and the protection path is another optical fiber with channel protection function. When the working path fails, it can be switched to the protection path for information transmission.

[0052] In the third embodiment, the network management device stores n (n=1, 2, 3...) asymmetric error compensation values ​​in advance, and the asymmetric error compensation values ​​correspond to the working path or th...

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Abstract

The invention discloses a method, system and equipment for transmitting time synchronization information on ground. The method comprises the following steps that: a time source sends time synchronization information by virtue of a signal transmission channel and an optical supervisory channel which are arranged between the time source and downstream equipment; the downstream equipment acquires the time synchronization information received by one channel of the signal transmission channel and the optical supervisory channel and carries out time synchronization; and when the current channel used for acquiring the time synchronization information is detected to be in fault, the downstream equipment acquires the time synchronization information received by the other channel and carries out the time synchronization. In the embodiment of the invention, the time synchronization information is sent by virtue of the signal transmission channel and the optical supervisory channel which are arranged between the time source and the downstream equipment, and the downstream equipment acquires the time synchronization information received by the other channel and carries out time synchronization when the current channel used for acquiring the time synchronization information is in fault, thus the phenomenon that the time synchronization information is lost as a signal generator and a receiver of the signal transmission channel are in fault can be avoided.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for transmitting time synchronization information on the ground. Background technique [0002] TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system is a system that requires strict time synchronization. At present, TD-SCDMA system relies on GPS (Global Positioning System, Global Positioning System) to provide accurate time Synchronization, but from the perspective of ensuring network security, reducing construction difficulty and construction cost, time synchronization can be provided through ground transmission. At present, the scheme of transmitting time synchronization in optical fiber transmission system has been realized, and the time information is encapsulated in the signal. road transmission. [0003] In the WDM (Wavelength Division Multiplexing, wavelength division multiplexing) or OTN (Optical Transport Network, Optical...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L12/24H04J3/06
Inventor 李允博韩柳燕魏冰
Owner CHINA MOBILE COMM GRP CO LTD