Clock correcting method and system based on IP network for wireless base station

Abstract

The invention discloses a clock correcting method and a clock correcting system based on an IP network for a wireless base station, wherein the clock correcting method comprises a correction data collection process, in which the wireless base station acquires at least two groups of correction data, each of which includes first, second, third and fourth time stamps, wherein the first time stamp is the time when the wireless base station sends a clock synchronization request to a clock synchronization server, the second time stamp is the time when the clock synchronization server receives the clock synchronization request, the third time stamp is the time when the clock synchronization server sends a clock synchronization response to the wireless base station, and the fourth time stamp is the time when the wireless base station receives the clock synchronization response; and a clock correction process, in which the wireless base station calculates a correction frequency error using the correction data and corrects the local clock according to the correction frequency error, wherein the correction frequency error is calculated according to a formula. The invention is capable of correcting the frequency offset of a wireless base station to provide a more accurate clock.

Description

technical field The present invention relates to clock synchronization of wireless base stations in the field of mobile communication, in particular to a method and system for correcting clocks of wireless base stations based on IP networks. Background technique Global System For Mobile Communication (GSM for short) is the most widely used communication standard in mobile communication. The wireless access network of the GSM system is usually called the base station subsystem (Base Station Subsystem, BSS), which is composed of the base station controller (BSC) and the BTS base station transceiver. Reception and radio resource management. Wireless base stations require precise clock signals to provide precise timing in various applications, such as over-the-air transmissions. Usually, wireless base stations use TCXO (Temperature Compensated Crystal Oscillator, Temperature Compensated Crystal Oscillator) voltage-controlled crystal oscillator to generate 26MHz oscillation fr...

AI Technical Summary

Problems solved by technology

For IP networking, the clock signal cannot be obtained through the E1 link, and the clock accuracy obtained simp

Images