Clock synchronization method and system of satellite communication-based base station

Abstract

The invention discloses a clock synchronization method of a satellite communication-based base station. The method comprises the following steps: very small aperture terminal (VSAT) main station of a very small aperture satellite terminal station based on IP technology receives a clock signal from a base station controller (BSC) and transmits the clock signal to a VSAT end station through satellite communication; and the VSAT end station receives the clock signal, sends the clock signal to a base station and indicates the base station to use the clock signal as the reference clock signal. By using the method, clock synchronization of the base station and the BSC can be ensured without adopting a GPS receiver. The invention also discloses a clock synchronization system of the satellite communication-based base station.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for clock synchronization in a base station based on satellite communication. Background technique [0002] The base stations set up in some remote areas or mountainous areas cannot lay optical fibers due to the limitation of the geographical environment, and the communication between the base station and the base station controller (BSC) can only be realized through satellite communication, such as the very small aperture based on IP technology. Satellite communication of the satellite terminal station (Very Small ApertureTerminal, VSAT). There are many kinds of base stations based on satellite communication, such as a base transceiver station (Base Transceiver Station, BTS), a TD base station, or other types of base stations. [0003] The BTS base station is a time division multiplexing (Time Division Multiplexing, TDM) based base station. During the w...

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Problems solved by technology

[0006] 1. When installing the antenna of the GPS receiver, in order to ensure that the number of satellites that can be received is large, it is necessary to meet the requirements of 120 0 The clearance requirement makes the construction of the antenna difficult to install; when the feeder distance of the antenna exceeds 110 meters, it is necessary to increase the signal strength by adding a relay amplifier, because the feeder of the GPS antenna is relatively thick at a long distance, which also brings inconvenience to the installation process

[0007] 2. Installing additional GPS receivers at the BTS base station may increase the instability of the BTS base station, and, since each BTS base station must install a GPS receiver, the cost of the base station will be increased

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