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Downlink synchronization method and system for vehicle-mounted 5G equipment of high-speed train

A technology for high-speed trains and synchronization systems, applied in modulation carrier systems, synchronization devices, transmission systems, etc., can solve the problem of low synchronization success rate, and achieve the effect of improving downlink synchronization success rate and cell search success rate.

Active Publication Date: 2020-05-08
CHONGQING UNIV OF POSTS & TELECOMM
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  • Claims
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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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  • Downlink synchronization method and system for vehicle-mounted 5G equipment of high-speed train
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  • Downlink synchronization method and system for vehicle-mounted 5G equipment of high-speed train

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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] figure 1 It is a flow chart of a downlink synchronization method for a vehicle-mounted 5G device of a high-speed train according to the present invention. The method can be applied to a train 5G communication device and can improve the success rate of cell search in a high-speed mobile environment. The method includes but is not limited to the following steps:

[0024] S1. The user equipment UE sends a connection request to the interface of the train eq...

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Abstract

The invention relates to the technical field of mobile communication, in particular to a downlink synchronization method and system for vehicle-mounted 5G equipment of a high-speed train. The method comprises the steps that user equipment UE sends a connection request to a train interface; after the connection is successful, the UE reads the information through the interface; if the train is in the stop state, a downlink synchronization process is directly carried out; if the train is in a running state, time domain pre-frequency offset compensation is carried out after pre-frequency offset estimation is carried out through a pre-frequency offset compensation module, and then a downlink synchronization process is carried out; according to the obtained cell ID and frame synchronization information, the UE receives and processes a physical downlink broadcast channel in a PBCH processing module to obtain main system information MIB, and cell search is completed. According to the method, apre-frequency offset compensation method is adopted before downlink synchronization, the cell search success rate in a high-speed mobile environment is greatly improved, and simulation results show that the downlink synchronization success rate in a high-speed mobile scene can be improved by 30%-60%.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a downlink synchronization method and system for a vehicle-mounted 5G device of a high-speed train. Background technique [0002] In recent years, high-speed railways have been widely developed around the world. 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 higher requirements on the performance of 5G equipment in high-speed scenarios. [0003] The downlink transmission signal of 5G NR selects Orthogonal Frequency Division Multiplexing (OFDM) signal. OFDM is a multi-carrier modulation technology. Compared with the traditional frequency division multiplexing (Frequency Division Multiplexing, FDM), all subcarriers of OFDM are mutually orthogonal, and spectrum overlap can be performed to a certain extent. Save spectrum resources....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/42H04W48/16H04W56/00H04W76/10H04L27/26H04J11/00
CPCH04W4/42H04W48/16H04W56/00H04W76/10H04L27/2657H04J11/0073H04J11/0076H04J2011/0096
Inventor 李贵勇张翰卿李小文陈发堂王华华王丹
Owner CHONGQING UNIV OF POSTS & TELECOMM
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