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Obtaining and keeping synchronous method for base station

A technology for maintaining synchronization and base stations, applied in the direction of synchronization devices, communication between multiple stations, digital transmission systems, etc., can solve problems such as jitter, and achieve accurate detection effects

Inactive Publication Date: 2007-10-10
BEIJING XINWEI TELECOM TECH
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AI Technical Summary

Problems solved by technology

When GPS out-of-synchronization or from synchronization to out-of-synchronization, it is necessary to switch between the synchronization signal output by GPS and the synchronization signal generated locally. Switching will cause jitter

Method used

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  • Obtaining and keeping synchronous method for base station
  • Obtaining and keeping synchronous method for base station

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Embodiment Construction

[0045] The present invention takes in the synchronous code division multiple access (SCDMA) system, a kind of distributed base station obtains and keeps the method and the device of synchronism as embodiment, specifically sets forth the implementation mode as follows:

[0046] In a distributed base station, the base station consists of two parts, one is a distributed base station transceiver (DBT, distribute basestation transceiver), and the other is a distributed base station transceiver controller DBC (DBT controller). These two parts can be separated Installed in different places, one DBC can carry 1 to 4 DBTs, and each DBT needs a synchronization signal synchronized by the entire network to control sending and receiving. For outdoor coverage, you can install a GPS module to obtain synchronization signals. For indoor coverage, DBT is generally installed in the basement and other places that are conducive to installing GPS modules. Therefore, for the application environment ...

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Abstract

The synchronous clock preprocessing and detecting unit detects rising edge of initial synchronization signal (SS), and filters out burrs. When rising edge is detected, local crystal oscillation clock starts counting, and till next rising edge of next SS so as to obtain a value of counter. Based on the value of counter, synchronization control unit carries out analysis, judgment and process. The synchronous clock output unit outputs SS. Being applicable to sync CDMA system; the invention can detect SS precisely. Precision of SS is not affected by absolute accuracy of crystal oscillation. In procedure of losing and recovering synchronization, switching procedure is not needed so that switching dithering will not produce.

Description

technical field [0001] The invention relates to a mobile communication system, especially a method for obtaining and maintaining synchronization of a base station in a synchronous code division multiple access system under TDD mode and its application. Background technique [0002] In the networking of the synchronous code division multiple access mobile communication system in the TDD mode, generally, each base station is synchronized with each other through a GPS timing system. The specific method is to set the working mode of GPS so that it can output a pulse signal of a certain period, and the timing of sending and receiving of the base station is synchronized on this pulse signal. Since the pulse signals output by the GPS of each base station are synchronous, the transceivers between the base stations are completely synchronized. "Clock Improvement Method and Device of GPS Timing System" (02160275.1) provides a clock improvement method of GPS timing system, which is ap...

Claims

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Application Information

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IPC IPC(8): H04L7/027H04B7/26H04Q7/30
Inventor 袁进李凯王火星
Owner BEIJING XINWEI TELECOM TECH
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