A method and system for downlink synchronization of on-board 5G equipment for high-speed trains

Abstract

The present invention relates to the technical field of mobile communication, in particular to a method and system for downlink synchronization of on-board 5G equipment of a high-speed train, comprising: a user equipment UE sends a connection request to a train interface; after the connection is successful, the UE reads the information through the interface; In the stop state, the downlink synchronization process is directly performed; if the train is in the running state, the pre-frequency offset compensation module is used to estimate the pre-frequency offset and then perform the time-domain pre-frequency offset compensation, and then perform the downlink synchronization process; according to the obtained cell ID and frame For synchronization information, the UE receives and processes the physical downlink broadcast channel in the PBCH processing module, obtains the main system information MIB, and completes the cell search. The invention adopts the pre-frequency offset compensation method before downlink synchronization, which greatly improves the success rate of cell search in the high-speed mobile environment.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method and system for downlink synchronization of on-board 5G equipment of a high-speed train. Background technique [0002] In recent years, high-speed railways have been widely developed around the world, and in some areas, the speed may exceed 300km / h, such as the Japanese Shinkansen (320km / h), the German Intercity Express (330km / h) and the Shanghai Maglev Train (430km / h), which puts forward higher requirements for the performance of 5G equipment in high-speed scenarios. [0003] The downlink transmission signal of 5G NR selects Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) signal. OFDM is a multi-carrier modulation technology. Compared with the traditional Frequency Division Multiplexing (FDM), all sub-carriers of OFDM are orthogonal to each other, which can overlap the spectrum to a certain extent. Save...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems, the present invention aims at the problem of low downlink synchronization success rate of user equipment (UE) in a high-speed train moving environment, and integrates the inherent mechanical speed detection of the train with Beidou satellite / Global Positioning System (Global Positioning System, GPS ) positioning function combined with 5G new air interface NR (New Radio, NR) synchronization process to provide a downlink synchronization method and system for vehicle-mounted 5G equipment of high-speed trains

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