KR102409733B1 - LTE-R Commucation System for use in Train - Google Patents

Abstract

An LTE-R communication system constituting a VPN (Virtual Private Network) in a train is disclosed. The LTE-R communication system includes a VPN server installed on an LTE-R network network, an LTE-R modem installed in each vehicle to communicate with the VPN server through the LTE-R network network, and an LTE installed in each vehicle. -R VPN Tab Interface that provides a connection point of Layer 2 VPN Tunneling for VPN clients and VPN clients that communicate with the VPN server through R modem and communicate with each other ), and a local switch interface that performs communication switching between the VPN tap interface and predetermined communication devices in the vehicle. LTE-R Layer2 VPN is configured in the train, so the configuration cost is low and maintenance and management functions can be configured remotely as communication functions.

Description

LTE-R Communication System for use in Train}

The present invention relates to an LTE-R communication system for a train, and to an LTE-R communication system for a train that enables LTE-R communication between vehicles of a train to be performed through a Layer2 VPN Network.

Wired communication lines constituting signal communication and power lines are installed in moving cars and passenger cars constituting trains such as railways and subways. A train line is an insulated wire that runs from the leading vehicle to the last vehicle in a train, and the vehicles are connected with an electrical connection plug. <Refer to the railway-related large dictionary>

Existing human traffic lines are composed of internal wiring and inter-vehicle connecting devices (plugs) to connect the moving cars and passenger cars of the train with wires such as copper lines or optical cables. In the case of trains, up to 20 cars and carriages are connected, and 38 connection points are required for connecting devices (plugs) to connect each vehicle, and smooth communication occurs only when all connections are normal. However, due to the aging of the train and vibration during operation, poor connection between connection devices at the connection point occurs, so that smooth communication connection is difficult in many cases. In addition, in order to use the existing wired communication line, a large number of personnel and expenses are required for the cost for configuring the communication line, maintenance management, and failure response.

Currently, an LTE-R wireless communication system for rail/subway is being built. The LTE-R project is a large-scale national project that improves communication speed and stability by unifying different railway wireless networks, and preemptively builds the 4th generation wireless network infrastructure, which is an essential condition of the Korean train control system (KTCS-2). The present invention uses such an LTE-R wireless communication system to configure a VPN (Virtual Private Network) in a train, as described above, to solve the problems of the conventional communication method using a public line and form a unified communication network. The purpose of this is to realize stable and fast communication.

In order to achieve the above object, the present invention provides an LTE-R communication system for configuring a VPN (Virtual Private Network) in a train including a plurality of vehicles.

The LTE-R communication system of the present invention includes: a VPN server that communicates with an LTE-R EPC through an LTE-R network network and manages a VPN (Virtual Private Network) in the train; and an LTE-R communication device that communicates with the VPN server through an LTE-R network network. The LTE-R communication device includes: an LTE-R modem installed in each of the vehicles, performing communication with the VPN server through the LTE-R network network, and performing communication with each other; a VPN client installed in each of the vehicles, performing communication with the VPN server and through the LTE-R modem, and communicating with each other; a VPN Tab Interface installed in each of the vehicles and providing a connection point of Layer2 VPN Tunneling for the VPN client; and a local switch interface that is bridged with the VPN tap interface and performs communication switching between the VPN tap interface and predetermined communication devices in the vehicle. The communication devices in any one of the vehicles are the local switch interface, the VPN tap interface, the VPN client, and the LTE to one or more of the communication devices in the vehicle, the LTE-R EPC, and the VPN server. -R Performs communication by layer 2 VPN tunneling via modem.

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The VPN server may have a dynamic IP.

According to another aspect of the present invention, the LTE-R communication system of the present invention includes a plurality of LTE-R communication devices provided in each of the vehicles. Each of the LTE-R communication device, is installed in each of the vehicle, and performs communication with the LTE-R EPC through the LTE-R network network, and also an LTE-R modem for performing communication with each other; a VPN client installed in each of the vehicles, performing communication with the VPN server and the LTE-R EPC through the LTE-R modem, and communicating with each other; a VPN Tab Interface installed in each of the vehicles and providing a connection point of Layer 2 VPN Tunneling for the VPN client or the VPN server; and a local switch interface that is bridged with the VPN tap interface and performs communication switching between the VPN tap interface and predetermined communication devices in the vehicle. The VPN client provided in any one of the plurality of LTE-R communication devices performs the function of a VPN server together with respect to the VPN clients provided in the remaining LTE-R communication devices, and the VPN server is the LTE-R It communicates with the LTE-R EPC through a modem and manages a VPN (Virtual Private Network) in the train, and the communication devices in any one of the vehicles include the communication devices in the other one or more vehicles and the LTE- For R EPC, communication by layer 2 VPN tunneling is performed through the local switch interface, the VPN tap interface, the VPN client or the VPN server, and the LTE-R modem.

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The VPN server preferably has a static IP.

According to the present invention, LTE-R Layer2 VPN is configured, so the configuration cost is low, maintenance and management functions can be configured remotely as communication functions, and immediate disability recognition and response are possible.

In addition, according to the prior art, a problem may occur due to communication interruption due to disconnection of human traffic lines during a train derailment accident.

1 is a diagram schematically illustrating an LTE-R communication system and a VPN configured using the LTE-R communication system according to a first embodiment of the present invention;
Fig. 2 is a view similar to Fig. 1 showing a second embodiment of the present invention;

The present invention provides a communication system constituting a VPN (Virtual Private Network) that replaces the existing public line using the LTE-R wireless communication system currently being built for trains such as railways/subway. would like to present In order to replace the service line, each device must configure the same Layer 2 Broadcast Network Domain in order to be connected under two or more NAT (Network Address Translation) environments like the existing service line. The invention constitutes a communication system for implementing Layer2 VPN communication.

One of the methods to configure a Layer2 VPN network is to configure a VPN server in the network inside the LTE-R network and configure it as a VPN client inside the vehicle, and install and operate both a VPN server and a VPN client inside the vehicle. can be considered. The present invention implements them as shown in Figs. 1 and 2 as the first embodiment and the second embodiment, respectively.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a diagram illustrating an LTE-R communication system and a VPN configured using the same according to a first embodiment of the present invention, wherein a VPN server is configured in an LTE-R network and a VPN client is configured inside a vehicle. it will be shown

A train consists of one or more locomotives and one or more carriages. In the present invention, including these same cars and carriages, they are referred to as 'vehicles'. Therefore, in the description and claims of the present invention, the term 'vehicle' is used as a term that includes both the case of being configured including the same or only the passenger cars. In the drawings, elements having the same function among the components installed in each vehicle are shown with the same reference numerals for convenience of illustration and description.

Various communication devices 51 , 52 , 53 are provided in the vehicle. The communication devices 51 , 52 , 53 may include, for example, an engineer communication device 51 , an image display device 52 , a vehicle information interworking device 53 , and the like, as shown in FIG. 1 .

The present invention implements a Layer2 VPN Network in order to perform communication between communication devices 51, 52, 53 installed under two or more internal NAT (Network Address Translation) environments in each vehicle.

LTE-R communication devices (C1, C2) are installed in each vehicle. LTE-R communication devices (C1, C2) are each LTE-R modem (Modem) (10), VPN client (Client) (20), VPN tab interface (VPN Tab Interface) 30, and a local switch interface (Local) Switch Interface) (40). In addition, a VPN server (VPN Server) 60 is provided in the LTE-R network. VPN server 60 is included in the LTE-R communication system of the present invention together with the LTE-R communication devices (C1, C2).

The VPN server 60 communicates with the LTE-R EPC 70 through the LTE-R network network, and also performs a function of managing a VPN (Virtual Private Network) in the train. The LTE-R EPC 70 is a system that provides an LTE-R network network, and the figure shows the LTE-R network network mixed with the LTE-R EPC 70 .

The LTE-R modem 10 performs communication with the LTE-R EPC 70 through the LTE-R network network, and also performs communication with the VPN server 60 . In addition, the LTE-R modem 10 installed in each vehicle performs communication with each other through the LTE-R network network.

The VPN client 20 communicates with the VPN server 60 and the LTE-R EPC 70 through the LTE-R modem 10 and also communicates with each other.

The VPN tap interface 30 communicates with the VPN client 20 , and provides a connection point for Layer2 VPN Tunneling of the VPN client 20 .

The local switch interface 40 is bridged with the VPN tap interface, and by performing communication switching between the VPN tap interface 30 and the communication devices 51, 52, 53, the communication devices 51, 52, 53 ), open the communication path for data communication by selecting the one to which the communication data packet is to be transmitted or the target to which the received communication data packet is to be transmitted.

With this configuration, the communication devices 51, 52, 53 corresponding to the LTE-R communication device C1 in one vehicle are corresponding to the LTE-R communication device C2 in one or more other vehicles. It performs communication with the communication devices (51, 52, 53). In addition, the communication devices 51 , 52 , 53 in each vehicle perform communication with the LTE-R-EPC 70 and the VPN server 60 . At this time, each of the communication devices 51 , 52 , 53 is a local switch interface 40 , a VPN tap interface 30 , a VPN client 20 for the LTE-R EPC 70 , and the VPN server 60 , and the LTE-R modem 10 to perform communication by Layer2 VPN tunneling. Specifically, the VPN client 20 configures Layer2 VPN Tunneling to communicate with the communication devices 51, 52, 53 in one vehicle and the communication devices 51 and 52 of other vehicles through the VPN tap interface 30. , 53) are connected so that communication is possible. Accordingly, the LTE-R communication devices (C1, C2) installed in different vehicles are connected by Layer2 VPN Tunneling to form a Layer2 Broadcast Network Domain, thereby forming the lower communication devices (51, 52, 53) can achieve the same effect as direct communication.

2 is a diagram illustrating an LTE-R communication system and a VPN configured using the same according to a second embodiment of the present invention, wherein a VPN server is configured in one of the vehicles and a VPN client is configured inside the other vehicle. example is shown. In FIG. 2 , the same reference numerals are given to components having the same names as those of FIG. 1 for convenience of illustration and description.

In the embodiment of Fig. 2, the LTE-R communication device C1 of one of the vehicles is configured such that the VPN client 20 includes the function of the VPN server. That is, the VPN client 20 of FIG. 1 is installed in one vehicle, but the VPN client 20 is configured to perform the function of the VPN server together, and LTE-R in the remaining vehicles other than the vehicle in which the VPN server is configured. A VPN client 20 is installed in the communication device C2 as in FIG. 1 .

The functions performed by the VPN server in the LTE-R communication device C1 in FIG. 2 include the functions of the VPN client 20 and the functions of the VPN server 60 of FIG. 1 . That is, in the vehicle in which the VPN server is installed, the VPN tap interface 30 performs Layer 2 VPN tunneling with respect to the VPN server. Accordingly, the operation within the VPN including the operation for the communication devices 51 , 52 , 53 in each vehicle is the same as that of the VPN client 20 of FIG. 1 . In addition, the VPN server 60 functions to manage a VPN (Virtual Private Network) in the train for the VPN client 20 of the LTE-R communication device C2 installed in other vehicles.

As described above, according to the present invention, the VPN server 60 may be provided on the external LTE-R network network of the train as shown in FIG. 1 or the VPN server may be provided in any one of a plurality of vehicles as shown in FIG. 2 . When the IP assigned to the VPN server 60 is a dynamic IP, it is preferable to configure it as shown in FIG. 1, and in the case of a static IP, it is preferable to configure it as shown in FIG. 2 .

Although the present invention has been described with reference to the embodiment shown in the drawings, which is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

Claims (4)

An LTE-R communication system for configuring a VPN (Virtual Private Network) in a train including a plurality of vehicles, the LTE-R communication system comprising:
a VPN server that communicates with the LTE-R EPC through an LTE-R network network and manages a virtual private network (VPN) in the train; and
LTE-R communication device for performing communication through the LTE-R network with respect to the VPN server;
includes,
The LTE-R communication device,
an LTE-R modem installed in each of the vehicles, performing communication with the VPN server through the LTE-R network network, and communicating with each other;
a VPN client installed in each of the vehicles, performing communication with the VPN server and through the LTE-R modem, and communicating with each other;
a VPN Tab Interface installed in each of the vehicles and providing a connection point of Layer2 VPN Tunneling for the VPN client; and
a local switch interface that is bridged with the VPN tap interface and performs communication switching between the VPN tap interface and predetermined communication devices in the vehicle;
includes,
The communication devices in any one of the vehicles are the local switch interface, the VPN tap interface, the VPN client, and the LTE to one or more of the communication devices in the vehicle, the LTE-R EPC, and the VPN server. -LTE-R communication system, characterized in that the communication by layer 2 VPN tunneling through the R modem.
The method of claim 1,
The VPN server LTE-R communication system, characterized in that it has a dynamic IP.
An LTE-R communication system for configuring a VPN (Virtual Private Network) in a train including a plurality of vehicles, the LTE-R communication system comprising:
Includes a plurality of LTE-R communication devices provided in each of the vehicle,
Each of the LTE-R communication devices,
an LTE-R modem installed in each of the vehicles, performing communication with the LTE-R EPC through the LTE-R network network, and performing communication with each other;
a VPN client installed in each of the vehicles, performing communication with the VPN server and the LTE-R EPC through the LTE-R modem, and communicating with each other;
a VPN Tab Interface installed in each of the vehicles and providing a connection point of Layer 2 VPN Tunneling for the VPN client or the VPN server; and
a local switch interface that is bridged with the VPN tap interface and performs communication switching between the VPN tap interface and predetermined communication devices in the vehicle;
includes,
The VPN client provided in any one of the plurality of LTE-R communication devices performs the function of a VPN server together with respect to the VPN client provided in the remaining LTE-R communication devices,
The VPN server communicates with the LTE-R EPC through the LTE-R modem and manages a Virtual Private Network (VPN) in the train,
The communication devices in one of the vehicles are the local switch interface, the VPN tap interface, the VPN client or the VPN server, and the LTE-R EPC to the communication devices in one or more other vehicles and the LTE-R EPC. An LTE-R communication system, characterized in that it performs communication by layer 2 VPN tunneling via an R modem.
4. The method of claim 3,
The VPN server LTE-R communication system, characterized in that it has a fixed IP.

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