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Method and apparatus for measuring wireless transmission delay of train integrity monitoring system

A wireless transmission and monitoring system technology, applied in transmission monitoring, wireless communication, transmission system, etc., can solve problems such as failure of monitoring function and affecting the integrity detection function of column tail

Inactive Publication Date: 2016-04-20
CHINA RAILWAYS CORPORATION +1
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Problems solved by technology

The real-time performance of the wireless communication transmission of the train integrity monitoring system is very important. The delay time of wireless communication GSM-R, GPRS, 3G and other communication methods is very important for the function of the train tail system, and the communication delay will affect the integrity of the train tail. sex detection function, and even lead to the failure of its monitoring function

Method used

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  • Method and apparatus for measuring wireless transmission delay of train integrity monitoring system
  • Method and apparatus for measuring wireless transmission delay of train integrity monitoring system
  • Method and apparatus for measuring wireless transmission delay of train integrity monitoring system

Examples

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Effect test

Embodiment 1

[0064] We use the message confirmation mechanism method to test the delay of wireless communication. The imbalance of the network and the influence of the process scheduling of the operating system may cause the failure of clock synchronization. For the imbalance of the network, the message confirmation mechanism can be used to effectively solve this problem. That is, the receiver returns a confirmation message after receiving the message, and the sender can only send the next message after the receiver's confirmation message. In this way, the two information transmissions are isolated, so that the receiver will not receive all the information from the sender at once. We use this mechanism to add time information to it, and calculate the delay time accordingly.

[0065] The imbalance of the network and the influence of the process scheduling of the operating system may cause the failure of clock synchronization. For the imbalance of the network, the message confirmation mec...

Embodiment 2

[0090] The structural diagram of a wireless transmission delay measuring device of a train integrity monitoring system provided by this embodiment is as follows image 3 As shown, including: a ground monitoring center 31 and a vehicle unit 32,

[0091] The vehicle-mounted unit 32 is used to transmit data packets back and forth multiple times between the ground monitoring center, and the time information for receiving and sending the data packets by the ground monitoring center and the vehicle-mounted unit is recorded in the data packets;

[0092] The ground monitoring center 31 is used to transmit data packets back and forth multiple times between the vehicle-mounted unit, and obtain the wireless transmission delay between the ground monitoring center and the vehicle-mounted unit according to the time information recorded in the data packet .

[0093] Further, the ground monitoring center 31 is used to send a Sync_Mesage message with a time stamp to the vehicle unit, and reco...

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Abstract

An embodiment of the invention provides a method and apparatus for measuring the wireless transmission delay of a train integrity monitoring system. The method mainly comprises the steps of transmitting a data packet back and forth for several times between a ground monitoring center and a vehicle-mounted unit in a train integrity monitoring system, the data packet being recorded with time information that the ground monitoring center and the vehicle-mounted unit receive and transmit the data packet; and acquiring the wireless transmission delay between the ground monitoring center and the vehicle-mounted unit according to the time information recorded in the data packet. According to the embodiment of the invention, the active test method of the wireless transmission delay obtained by eliminating an overlarge deviation value can obtain a relatively high wireless transmission delay test accuracy when main and sub end clocks are difficult to synchronize, therefore, an optimal wireless communication mode is selected, and the real-time requirement of communication between a terminal device in the train integrity monitoring system and a server can be effectively met at last.

Description

technical field [0001] The invention relates to the technical field of train monitoring, in particular to a method and device for measuring wireless transmission delay of a train integrity monitoring system. Background technique [0002] The GPS-assisted train integrity monitoring system consists of on-board equipment and ground equipment. Vehicle-mounted equipment includes end-of-train (EOT) and head-of-train (HOT). The terminal equipment at the end of the train and the terminal equipment at the head of the train have the functions of wireless communication and GPS positioning, and at the same time can complete the functions of wind pressure detection at the rear of the train and driver alarm. [0003] Ground equipment includes server and client. The server software is responsible for receiving and storing the data sent by the terminal, and then forwarding it to different clients according to the query requirements; the client software calls these data according to the ma...

Claims

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Application Information

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IPC IPC(8): H04L12/26H04B17/364H04W24/00
CPCH04L43/0852H04W24/00
Inventor 王剑蔡伯根上官伟刘江李四辉
Owner CHINA RAILWAYS CORPORATION
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