4G/5G wireless transmission method for vehicle-mounted maintenance terminal of urban rail vehicle

Abstract

The invention relates to a 4G/5G wireless transmission method for a vehicle-mounted maintenance terminal of an urban rail vehicle. The 4G/5G wireless transmission method comprises the following steps: a data acquisition step: a terminal acquires data of each device of the vehicle in real time; a TCP connection step: the terminal sends a TCP connection request to the server, and the server receives the request and starts a data receiving service thread; an equipment handshake step: the terminal sends a message with equipment information to the server, and when the equipment information is correct, the server is ready and then returns a sending permission command, otherwise, the receiving is refused; a data sending step: packing the communication data by taking 1024ms as a unit to generate a packet comprising a timestamp, a channel, a data packet byte number and data, and sending one packet at a time when the data is sent; and a TCP disconnection step: after the terminal is powered off, the terminal is disconnected from the server, and after the terminal non-power-off condition data transmission is completed, the TCP connection is not disconnected and the connection is kept. According to the invention, the ground data receiving center can reach a saturated state without increasing the number of vehicles.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to a train information transmission technology, in particular to a 4G / 5G wireless transmission method for an on-board maintenance terminal of an urban rail vehicle. Background technique [0002] With the explosive growth of urban rail transit vehicles, subway operating companies urgently need an intelligent operation and maintenance system for key systems of urban rail vehicles. The intelligent operation and maintenance system can efficiently analyze and predict vehicle failures in a timely manner. For each key system of rail vehicles, the first step to realize intelligent operation and maintenance is to obtain sufficient real-time data of each key system. Now it is common to transmit the information on the train to the ground data receiving center through 4G / 5G communication technology, so as to establish a train-ground wireless transmission monitoring system. [0003] For rail...

AI Technical Summary

Problems solved by technology

[0003] For rail vehicle fault analysis, there are often certain requirements for the density of transmitted data. For some valves or other electrical equipment, the time interval between data points is too long to analyze the cause of the fault.

Therefore, the current communication method often pursues a very fast communication frequency. For example, the data needs to be updated once every 100ms. This will cause the ground data receiving center to have high requirements on hardware and software performance. With the increase of vehicles, the ground data receiving center may will quickly reach saturation

On the other hand, the existing Internet of Things protocol is complex for point-to-point data transmission in the rail industry, and the protocol framework itself will cause some traffic loss

At the same time, the data of CAN communication protocol and TRDP (vehicle real-time Ethernet) protocol commonly used on rail vehicles cannot carry out specific information transmission well.

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