CN111836365A - Communication system based on high-speed urban rail - Google Patents

Abstract

A communication system based on high-speed urban rail relates to railway communication technology. The present invention includes the following parts: trackside wireless communication nodes arranged along the track, each node includes at least two channels, each channel frequency of each node is different from each channel frequency of adjacent nodes; The in-vehicle wireless communication device on the vehicle, the in-vehicle wireless communication device includes a first in-vehicle wireless communication module, a second in-vehicle wireless communication module and a control module, the control module is used to control the first in-vehicle wireless communication module and the second in-vehicle wireless communication module according to the position of the train The working channel of the vehicle wireless communication module is adapted to the channel frequency of the node where it is located. The invention improves the terminal handover smoothness and handover rate.

Description

Communication system based on high-speed urban rail

technical field

The present invention relates to railway communication technology.

Background technique

China's urban rail transit industry is developing rapidly, with more than 5000KM lines in operation. In recent years, with the acceleration of urbanization in China, the domestic urban rail industry has gradually increased the number of high-speed urban rail transit lines exceeding 120Km/h in the field of airport express lines and urban express rail lines, and has practical applications in Beijing, Shanghai, Guangzhou, Chengdu and other places. line under construction.

Urban rail transit is divided into two categories for vehicle-ground wireless communication. One is train control and train dispatch safety related services. The existing LTE-M technical solution (working in the 1.8GHz frequency band) can be well solved. Another category is PIS/CCTV non-safety services, but the demand for vehicle-ground bandwidth is relatively high: in normal operation scenarios, the air interface rate of about 20Mbps is required; in emergency situations, the control center needs to view all 32-channel camera videos of the vehicle, which requires more than 40Mbps Air interface rate. In the high-speed scenario exceeding 120Km/h, the traditional Wlan vehicle-ground communication solution can no longer meet the actual application requirements, and must be solved by LTE technology, but two practical problems must be solved:

First, the LTE technology should be deployed in the 5.8GHz frequency band that can be obtained by application. The corresponding technology has been defined in the 3Gpp R14 version standard, and Huawei Technologies Co., Ltd. already has corresponding products.

Second, solve the problem of 40Mbps air interface rate in emergency situations. The maximum carrier of the traditional LTE solution is 20MHz. In the high-speed scenario of the urban rail industry, the air interface rate that can be provided is about 20Mbps.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an LTE-U vehicle-ground communication dual-carrier networking scheme to meet the requirements of high-speed urban rail vehicle-ground wireless communication.

The technical scheme adopted by the present invention to solve the technical problem is that the communication system based on high-speed urban rail includes the following parts:

The trackside wireless communication nodes arranged along the track, each node includes at least two channels, and the frequency of each channel of each node is different from the frequency of each channel of adjacent nodes;

An on-board wireless communication device arranged on a train, the on-board wireless communication device includes a first on-board wireless communication module, a second on-board wireless communication module and a control module, the control module is used to control the first on-board wireless communication module according to the train position and the working channel of the second in-vehicle wireless communication module to adapt to the channel frequency of the node where it is located.

Further, the trackside wireless communication node includes a class A node and a class B stage arranged staggered, the class A node has a first channel and a second channel, and the class B stage has a third channel and a fourth channel;

The in-vehicle wireless communication device includes a first in-vehicle wireless communication module, a second in-vehicle wireless communication module and a control module, the control module is used to control the working channels of the first in-vehicle wireless communication module and the second in-vehicle wireless communication module according to the train position , to make it work in one of the following modes:

a. Two on-board wireless communication modules work in the first channel and the second channel respectively;

b. The two in-vehicle wireless communication modules work in the third channel and the fourth channel respectively.

The in-vehicle wireless communication device further includes an emergency control module for controlling the first in-vehicle wireless communication module and the second in-vehicle wireless communication module, so that either one of the two works simultaneously on the two channels of the cell where it is located.

The beneficial effect of the present invention is that the present invention adopts two sets of vehicle-mounted TAU terminals, which can respectively access two different wireless cells in the 20MHz frequency band, thus achieving the effect of dual-carrier networking, and the reliability and flexibility of vehicle-ground wireless communication. All have improved significantly. In ordinary operation scenarios, the active and standby vehicle TAUs work on two wireless networks with different frequency bands. Compared with the traditional solution (active and standby work on one wireless network), the reliability of vehicle-to-ground communication is improved in ordinary operation scenarios. In the emergency operation scenario, the two sets of vehicle-mounted TAUs deployed at the front and rear of the vehicle can work on two wireless networks at the same time and transmit PIS/CCTV services at the same time, meeting the needs of uploading all 32 cameras of the vehicle to the control center at the same time in an emergency. The present invention also supports communication in a single wireless 20MHz cell, and only uses one vehicle-mounted TAU terminal to reduce interference between terminals. The invention makes full use of 5.8G frequency resources, adopts inter-frequency networking between the front and rear cells, and improves the terminal handover stability and handover rate.

Description of drawings

FIG. 1 is a schematic diagram of the trackside communication device of the present invention.

FIG. 2 is a schematic diagram of a system application example of the present invention.

Detailed ways

See Figures 1-2.

The present invention provides an urban rail transit vehicle-ground wireless communication system based on LTE-U technology, which carries vehicle-mounted PIS/CCTV services. The areas that the vehicle-ground wireless communication network needs to cover mainly include all the main lines of the upstream and downstream sections, stations, depots/parking lots. The control center deploys a wireless core network and network management, etc., and connects with the station through a dedicated transmission network.

One set of LTE core network equipment is set up in the control center, and the station switch is set in the station or interval communication room.

The base station AirNode equipment of the LTE-U vehicle-ground wireless communication system is all deployed in the main line section tunnel or elevated trackside, vehicle depot/parking lot, and each AriNode is equipped with two directional antennas to achieve wireless coverage on both sides of the site.

The LTE-U network on-board equipment in the train head/tail driver's cab is composed of on-board access unit TAU, on-board industrial Ethernet switch, and antenna feeder system. The TAUs at the front and rear of the vehicle work under the LTE-U vehicle-ground wireless communication network at the same time, ensuring uninterrupted PIS services and CCTV services. A pair of roof antennas are installed on the top of each end of the cab of each train to receive the wireless signal TAU transmitted by AirNode in the area.

The trackside wireless communication device of the present invention is arranged along the track, including the wireless communication device of class A cell and the wireless communication device of class B cell arranged staggeredly (for example, the way of A-B-A-B-A-B), and the wireless communication device of class A cell has the first channel f1 and the second channel f1 channel f2, the wireless communication device of the B class cell has a third channel f3 and a fourth channel f4;

An on-board wireless communication device arranged on a train, the on-board wireless communication device includes a first on-board wireless communication module, a second on-board wireless communication module and a control module, the control module is used to control the first on-board wireless communication module according to the train position and the working channel of the second vehicle wireless communication module, make it work in one of the following modes:

a. Two on-board wireless communication modules work in the first channel and the second channel respectively;

b. The two in-vehicle wireless communication modules work in the third channel and the fourth channel respectively.

The in-vehicle wireless communication device further includes an emergency control module for controlling the first in-vehicle wireless communication module and the second in-vehicle wireless communication module, so that either one of the two works simultaneously on the two channels of the cell where it is located. In the emergency operation scenario, the two sets of vehicle-mounted TAUs deployed at the front and rear of the vehicle can work on two wireless networks at the same time and transmit PIS/CCTV services at the same time, meeting the needs of uploading all 32 cameras of the vehicle to the control center at the same time in an emergency.

The above provides an example of staggered arrangement of two frequency groups, the present invention can also adopt the implementation of three or more frequency groups, such as A-B-C-B-A.., which is obvious to those of ordinary skill. The "trackside wireless communication node set along the track" referred to in the present invention does not necessarily cover the start point to the end point of an intercity line, such as a complete line from Beijing to Shanghai. A 50-kilometer-long section of track in the line, although its starting point and ending point are different from the entire line (starting point Beijing - ending point Guangzhou), still belongs to the right scope of the present invention.

Claims (3)

1. The communication system based on the high-speed urban rail is characterized by comprising the following parts:

the system comprises trackside wireless communication nodes arranged along a track, wherein each node comprises at least two channels, and each channel frequency of each node is different from each channel frequency of an adjacent node;

the vehicle-mounted wireless communication device is arranged on a train and comprises a first vehicle-mounted wireless communication module, a second vehicle-mounted wireless communication module and a control module, wherein the control module is used for controlling working channels of the first vehicle-mounted wireless communication module and the second vehicle-mounted wireless communication module according to the position of the train so as to enable the working channels to be adapted to the channel frequency of a node where the working channels are located.

2. A high speed urban rail-based communication system according to claim 1, wherein said trackside wireless communication nodes comprise a staggered arrangement of class a nodes having a first channel and a second channel and class B phases having a third channel and a fourth channel;

the vehicle-mounted wireless communication equipment comprises a first vehicle-mounted wireless communication module, a second vehicle-mounted wireless communication module and a control module, wherein the control module is used for controlling working channels of the first vehicle-mounted wireless communication module and the second vehicle-mounted wireless communication module according to the position of a train so as to enable the first vehicle-mounted wireless communication module and the second vehicle-mounted wireless communication module to work in one of the following modes:

a. the two vehicle-mounted wireless communication modules work in a first channel and a second channel respectively;

b. the two vehicle-mounted wireless communication modules work in a third channel and a fourth channel respectively.

3. A high speed urban rail-based communication system according to claim 2, wherein said vehicle-mounted wireless communication device further comprises an emergency control module for controlling the first vehicle-mounted wireless communication module and the second vehicle-mounted wireless communication module to operate both channels of the cell in which they are located.

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