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Point-to-point remote clock transmission method and equipment

A point-to-point, long-distance technology, applied in the communication, electrical components, synchronization devices and other directions between multiple stations, can solve the problems of no channel allocation, transmission distance limitation, inability to meet the distance between the antenna and the base station, etc., to achieve cost savings, Solve the effect of limited transmission distance and reduced quantity

Inactive Publication Date: 2011-04-13
CHINA ACAD OF TELECOMM TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Solution 1. The satellite signal received by the radio frequency cable at the transmission antenna has a transmission distance limit, which cannot meet the actual situation that some antennas are far away from the base station
[0007] Solution 2. The OCU can only communicate with one ICU in two directions without channel allocation, so it can only realize point-to-point time service, and cannot satisfy the situation of simultaneously giving time to multiple base stations

Method used

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  • Point-to-point remote clock transmission method and equipment
  • Point-to-point remote clock transmission method and equipment
  • Point-to-point remote clock transmission method and equipment

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0038] image 3 The implementation process intent for the point-to-point remote clock transfer method, as shown in the figure, may include the following steps:

[0039] Step 301, OCU obtains clock information;

[0040] Step 302, the OCU broadcasts clock information to each ICU through an optical fiber; wherein, the OCU is connected to at least two ICUs through an optical splitter / combiner, and the optical fiber includes downlink channels for several OCUs to broadcast information to each ICU.

[0041] In specific implementation, OCU can obtain clock information from satellite, but the technical solution that the present invention provides is to solve the clock information on one OCU and transmit to a plurality of ICUs, therefore, OCU can obtain clock information from satellite, but from other channels The acquired clock information can still be used wi...

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PUM

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Abstract

The invention discloses a point-to-point remote clock transmission method and equipment. The equipment comprises an outdoor clock unit for acquiring clock information and indoor clock units, wherein the outdoor clock unit broadcasts clock information to all indoor clock units through optical fibers; the outdoor clock unit is connected with at least two indoor clock units through an optical branching device / combiner, and the optical fibers comprise a plurality of downstream channels by which the outdoor clock unit broadcasts information to all indoor clock units. The invention can make optical fiber transmission distance reach 40km at least, effectively solve the problem of limited radio frequency cable transmission distance, achieve the purpose for providing time service for multiple base stations with one satellite receiver, reduce satellite receiver number and save cost.

Description

technical field [0001] The invention relates to communication equipment, in particular to a point-to-point remote clock transmission method and equipment. Background technique [0002] In the TD-SCDMA (Time Division Synchronized Code Division Multiple Access) system, there are strict time synchronization and frequency synchronization requirements between base stations. 3GPP (3rd Generation partnership project, 3rd generation cooperation project) stipulates that the time synchronization of air interfaces between base stations is less than 3us, and the frequency synchronization is less than 0.05ppm. [0003] At present, in the TD-SCDMA system, the synchronization between base stations mainly relies on satellite navigation systems, including GPS (Global Positioning System, Global Positioning System) and Beidou first generation. Existing base station time synchronization mainly uses satellite navigation receivers (such as GPS or Beidou receivers, etc.) for time service to reali...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04B7/26
CPCH04W88/085
Inventor 高峰谢子阳
Owner CHINA ACAD OF TELECOMM TECH
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