A method, device and system for inter-cell clock synchronization

Abstract

The embodiments of the present invention disclose a method, a device and a system for inter-cell clock synchronization. The method includes: first, installing a satellite positioning system receiving module on a remote radio frequency unit (RRU) provided with a fronthaul network transmission interface (eCPRI), the remote radio frequency unit according to the precision time protocol (PTP), through the fronthaul network The transmission interface synchronizes the high-precision reference time received from the satellite positioning system receiving module to the baseband unit; then, the baseband unit synchronizes the reference time to other remote radio frequency units without a GPS receiving module according to the precise time protocol . In this way, the clock synchronization of each remote radio frequency unit between cells is realized. In the method, the satellite positioning system receiving module is installed on the remote radio frequency unit, which can be flexibly deployed outdoors or near the window, the antenna placement is simpler and more feasible, and the deployment complexity can be greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of mobile communications, and in particular, to a method, device and system for inter-cell clock synchronization. Background technique [0002] In cellular wireless, a certain geographical area covered by a certain frequency band is called a cell (referred to as a cell). Adjacent cells often use different frequency bands, and when the user terminal switches from one cell to another in the connected state, it must ensure that the entire cellular wireless network maintains precise synchronization between cells, so as to ensure that the user terminal's services are not interrupted. will be interrupted. [0003] There are two duplex communication modes in mobile communication technology: Time-Division Duplex (TDD) and Frequency-Division Duplex (FDD). Among them, the TDD system transmits and receives signals in the same frequency band. If the frequency and phase synchronization between cells is not achi...

AI Technical Summary

Problems solved by technology

[0004] The currently commonly used technical solutions are: 1) Deploy the satellite positioning system module on the base band unit (BBU). For general-purpose servers in Radio Access Network (O-RAN) architecture, the requirements for the environment are high, and the deployment is more complicated; 2) deploying the satellite positioning system module on the clock server on the core network (CN), the solution The time information through the baseband unit is transmitted to the FPGA accelerator card through the software method on the baseband unit, and the accuracy of the time will be affected. If the accuracy problem is to be solved, a 1588 clock server and a switch that supports 1588 must be introduced, which increases additional expenses.

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