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A high dynamic conversion method for high-speed railway broadband private network

A conversion method and high dynamic technology, applied in radio transmission systems, electrical components, transmission systems, etc., can solve problems affecting network performance, congestion, and reduction of wireless received signal strength, so as to improve user capacity and increase coverage radius Effect

Active Publication Date: 2018-05-11
中科凯普(北京)导航通信技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) High-speed rail users are distributed in strange narrow and long areas with a length of hundreds of kilometers and a width of hundreds of meters. The terrain is complex and the coverage of traditional base stations is difficult.
[0005] (2) High-speed rail user traffic is characterized by periodic pulses, which can easily cause interference, congestion or even paralysis to traditional base stations
[0006] (3) Car body penetration loss is high: High-speed trains adopt a fully enclosed car body structure, and some models use metal-coated glass. The car body penetration loss is as high as 30dB@2.6GHz, which will reduce the wireless reception signal strength of users in the car. Even the communication is interrupted
[0007] (4) Frequent cell switching: The high speed of the train and the small distance between base stations make the users in the train pass through multiple cells in a very short period of time, which may easily cause signaling storms and cause call drops
[0008] (5) Severe Doppler effect: The speed of the high-speed train is fast, and the Doppler frequency shift caused by it is more obvious, which leads to the reduction of the coherent performance of the base station and the terminal, directly affecting the network performance
[0009] Based on the above reasons, at present, when the speed of high-speed rail users is greater than 250km / h, the communication experience is very poor and they cannot access the Internet

Method used

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  • A high dynamic conversion method for high-speed railway broadband private network
  • A high dynamic conversion method for high-speed railway broadband private network
  • A high dynamic conversion method for high-speed railway broadband private network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A section of railway with a length of T=200km covers LTE base stations. Since the distance between base stations supported by HIDI-LTE is at most R=40km, this section of railway only needs N=5 base stations. The height of the base station is h=30m, and the distance between the base station and the rail is d=100m. Such as image 3 As shown, the train is traveling at a speed of v=400km / h, at time t1, the distance between point C and point D is L=2km, and the operating frequency of the signal is assumed to be f=3.5GHz. The communication method of HIDT-LTE is the vehicle-to-ground communication mode.

[0058] The high dynamic conversion steps of the high-speed rail broadband private network are as follows:

[0059] Step 1: HIDT-LTE uses GNSS and inertial navigation integrated navigation receiver to receive the navigation signal transmitted by the GNSS navigation subsystem, and performs positioning to obtain the position information of the train at the current time t1, tha...

Embodiment 2

[0069] The length of the railway and the distance from the base station are the same as in the first embodiment. Such as image 3 As shown, the height of the base station is h=30m, the distance between the base station and the rail is d=100m, the train speed v=300km / h, the time t2, the distance between point C and point D=5km, and the signal operating frequency f=2.5GHz. The communication method of HIDT-LTE is the vehicle-to-ground communication mode.

[0070] The high dynamic conversion steps of the high-speed rail broadband private network are as follows:

[0071] Step 1: HIDT-LTE uses GNSS and inertial navigation integrated navigation receiver for positioning, and obtains the position information of the train at time t2, that is, the position of point D (X2, Y2, Z2);

[0072] Step 2: HIDT-LTE obtains the location information (Xb, Yb, Zb) of base station B at point D by using the dedicated electronic map for high-speed rail, the base station height h=30m, the distance betw...

Embodiment 3

[0081]When the train runs to an area without ground LTE base station coverage, for example, the current position information of the train is (40°N, 116°E); the electronic map contains the information of available communication satellites and available frequency points in the area, such as the currently available satellite is Xing 12 satellite (87.5°E), the satellite is a geosynchronous orbit satellite, the available frequency point information is uplink 6GHz, downlink 4GHz, the control unit switches the working mode of HIDT to vehicle-satellite communication mode, at this time the MS-MIMO antenna adopts Single antenna working mode. In the vehicle-satellite working mode, the control unit uses the servo platform to control the antenna to align with the Zhongxing-12 satellite in real time.

[0082] The process of sending information from user A in the car to user B on the external network is as follows: User A in the car sends a signal to the Zhongxing No. 12 satellite through HI...

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Abstract

The invention provides a high-dynamic transformation method of a broadband special network of a high-speed train. The method comprises the following steps: setting a high-dynamic converter (HIDI) on a high-speed train; setting the high-dynamic converter on a train-ground communication mode in a coverage range of ground LTE (Long Term Evolution) base station (eNode) along the line of the high-speed train; and setting the high-dynamic converter on a train-satellite mode when no ground LTE (Long Term Evolution) base station (eNode) covers along the line of the high-speed train. The method provided in the invention combines the LTE technology, the satellite navigation technology and the satellite communication technology when the high-speed train moves at 300-500 km / h, so as to provide the broadband mobile communication, the network and the multi-media service for users in the train carriage and the other users moving at a high speed.

Description

technical field [0001] The invention relates to the field of high-speed rail mobile communications, in particular to a high-dynamic conversion method for a high-speed rail broadband private network. Background technique [0002] At present, the total mileage of high-speed rail in my country has reached 20,000 kilometers, ranking first in the world. In the future, by 2020, the operating mileage will reach more than 145,000 kilometers. China's high-speed rail is a trump card in the global competition of our country, and it will definitely set off a storm of China's high-speed rail in the future. However, the operating speed of high-speed rail trains can reach more than 350km / h, and there are many problems in user communication in high-speed rail compartments using existing mobile communication methods, resulting in poor user experience. The huge contradiction between the advanced high-speed rail power technology and the backward high-speed rail information service technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04L29/08
CPCH04B7/1853H04B7/18578H04L67/12
Inventor 艾国祥金声震万庆涛崔君霞胡超庞峰王希王鹏
Owner 中科凯普(北京)导航通信技术有限公司
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