KR20190022147A - Common data link system having multi-port and network configuration using virtual interface - Google Patents

Abstract

The present invention relates to a common data link system capable of switching between high-speed and low-speed ports and configuring a multicast channel using a virtual interface, and a network configuration method thereof. The common data link system comprises a single ground terminal for transmitting and receiving high-speed/low-speed data via a physical interface and a plurality of on-board terminals, wherein the ground terminal and the on-board terminal include: a first physical interface for high-speed data transmission; a second physical interface for low-speed data transmission; and a virtual network interface registered in a kernel of the ground terminal and of the on-board terminal and connected to the first and the second physical interfaces; and a device driver for dynamically connecting the first and the second physical interfaces to the virtual network interface according to the transmission requirement speed or a transmission format of data.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a public data link system having multiple ports and a network configuration method using the virtual interface. 2. Description of the Related Art < RTI ID = 0.0 >

The present invention relates to a public data link system capable of switching between high-speed / low-speed ports and a multicast channel using a virtual interface, and a network configuration method thereof.

The public data link system is a communication system designed and standardized to transmit large amount of signal data or image information obtained from ISR (Intelligence Surveillance and Reconnaissance). The public data link system collects image information by connecting one or more mounted terminals mounted on a manned or unmanned surveillance and reconnaissance aircraft to one ground terminal.

In this public data link system, a control message sent from a land terminal to a land terminal is used for a low speed port due to a lack of frequency resources, and a high speed port is used for a large amount of signal data or image information sent from a land terminal to a land terminal. Also, since high-speed ports can not be provided simultaneously to all of the mounted terminals, a high-speed port and a low-speed port are mixed to constitute the network according to the operation status.

In general, the network interface is designed based on the assumption that the transmission / reception port is the same. Therefore, when the transmission / reception port is differently configured like the public data link system, the transmission path and the reception path are handled differently, and RIP (Rooting Information Protocol) Dynamic routing protocols such as Shortest Path First do not work. In this case, the user must operate with static routing, which is a method of inputting the routing path statically. Therefore, when the number of ports increases, the management burden of the operator increases, and when the network structure is changed, the routing table is not updated automatically. do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a public data link system and a network configuration method thereof, which can facilitate switching between high-speed and low-speed ports and implementing a multicast channel by using a virtual interface.

It is another object of the present invention to provide a public data link system and a method of configuring a network, which can interwork with a dynamic routing protocol using a virtual interface and change a network configuration according to a requested transmission rate.

According to an aspect of the present invention, there is provided a public data link system including a terrestrial terminal for transmitting / receiving high-speed / low-speed data via a physical interface and a plurality of on-board terminals, The terminal comprises a first physical interface for high speed data transmission; A second physical interface for slow data transfer; A virtual network interface registered in a terrestrial terminal and a kernel of a mobile terminal and connected to the first and second physical interfaces; And a device driver for dynamically connecting the first and second physical interfaces to the virtual network interface according to the transmission request speed or the transmission format of the data.

According to an embodiment of the present invention, the first physical interface may be a receiving port based on a terrestrial terminal, and the second physical interface may be a transmitting and receiving port based on a terrestrial terminal.

According to the embodiment of the present invention, one virtual network interface is registered in the on-board terminal, and a plurality of virtual network interfaces corresponding to the virtual network interfaces registered in each onboard terminal can be registered in the terrestrial terminal.

According to an embodiment of the present invention, IP and MAC addresses may be registered in the virtual network interface.

According to the embodiment of the present invention, when the device driver receives high-speed data from the first mounting terminal through the receiving port of the first virtual network interface and receives high-speed data from the second mounting terminal, The reception port of the interface is switched from high speed to low speed to recover the first physical interface and the receiving port of the second virtual network interface of the terrestrial terminal associated with the second mounting terminal is switched from low speed to high speed, Port reconfiguration can be performed.

According to the embodiment of the present invention, the device driver switches the transmission port of the virtual network interface from the high-speed to the low-speed in the first loading terminal based on the port reconfiguration of the terrestrial terminal, The port can be reconfigured as a high-speed transmission port and a low-speed reception port.

According to an embodiment of the present invention, when the transmission type is multicast transmission, the device driver connects a plurality of virtual network interfaces registered in a terrestrial terminal to one second physical interface to transmit a control message to a plurality of mounted terminals, The first physical interface may be connected to a plurality of network interfaces when receiving high-speed data.

According to another aspect of the present invention, there is provided a method of configuring a public data link system using a virtual network interface, the method comprising: registering a virtual network interface in a kernel of a land terminal and a land terminal; Performing data transmission between a land terminal and a loading terminal through a single first port for high-speed data and a plurality of second ports for low-speed data; And dynamically connecting the first and second physical interfaces to the virtual network interface according to a transmission request rate or a transmission format of the data.

According to an embodiment of the present invention, the transmission request rate of the data includes high speed data or low speed data, and the data transmission type may include unicast or multicast.

According to an embodiment of the present invention, the step of registering the virtual network interface registers one virtual network interface in the on-board terminal and registers a plurality of virtual network interfaces corresponding to the virtual network interfaces registered in the on-board terminals in the terrestrial terminal Wherein the first port is a receive port on a ground terminal basis and the second port is a transmit and receive port on a terrestrial terminal basis.

According to the embodiment of the present invention, in the dynamically connecting step, a first port for high-speed reception and a second port for low-speed transmission are connected to one virtual interface and a second port for low-speed transmission, And configuring the network such that a second port for low-speed transmission and reception is connected.

According to an embodiment of the present invention, when the high-speed data is received from the first loading terminal through the first port and the high-speed data is received from the second loading terminal through the first port, Switching the receiving port from high speed to low speed to recover the first physical interface; And reconfiguring the network by switching the receiving port of the second virtual network interface of the land terminal associated with the second land mobile terminal from low speed to high speed while maintaining a low speed transmitting port.

According to an embodiment of the present invention, the connecting dynamically comprises connecting a plurality of virtual network interfaces registered in a terrestrial terminal to one second physical interface when a transmission format of data is multicast; And reconfiguring the network by connecting a plurality of on-board terminals to the second physical interface.

According to the above embodiment, the present invention can construct a network using a virtual interface, and link dynamic routing protocols by dynamically connecting first and second physical interfaces to a virtual network interface according to a transmission request speed or a transmission format of data The multicast channel can be implemented, and the network configuration can be easily changed according to the required transmission rate.

1 is a block diagram of a baseband assembly control board of a public data link system having multiple ports.
2 is an exemplary diagram illustrating a general interface configuration method in a public data link system;
3 is a network configuration diagram using a virtual interface in a public data link system according to an embodiment of the present invention.
4 is a diagram illustrating an example in which switching between high speed and low speed ports (port reconfiguration) is performed using a virtual interface in a public data link system according to an embodiment of the present invention;
5 illustrates an embodiment of implementing a multicast service using a virtual interface in a public data link system according to an embodiment of the present invention.
6 is a flow chart of a high-speed port allocation for high-speed data transmission after allocation of directional low-speed ports in the present invention;

The terms and words used in the specification and claims of the present invention should not be construed to be limited to ordinary or dictionary meanings and the inventor should appropriately define the concept of the term to describe its invention in the best way It should be construed in the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments and the drawings described in the specification of the present invention are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, It should be understood that there may be variations.

The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The terms including ordinal such as first, second, etc. in the specification of the present invention can be used to describe various elements, but the constituent elements are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. In addition, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

In the specification of the present invention, when a component is referred to as "comprising ", it means that it can further include other components as long as there is no particular contrary description.

1 is a block diagram of a baseband assembly control board of a public data link system having multiple ports.

As shown in FIG. 1, in a common data link system, multiple ports are composed of one POS port for high-speed data transmission and four TDM ports for low-speed data transmission. The POS port is limited in the number of usable by the available frequency band as well as the specification of the applied network process.

2 shows a general interface configuration method in a public data link system.

Referring to FIG. 2, since a general interface configuration method configures an interface for each port, it can be seen that a transmission / reception interface changes when a high-speed port and a low-speed port are used, respectively. In this case, IP services such as ping and routing protocol do not work smoothly. In order to forward IP packet, user must intervene and add static routing table. In particular, when the POS terminal, which is a high-speed port, is connected to the modem 1 and the ground terminal receives high-speed data (eg, video) from the mounted terminal, the low-speed port (TDM1) through which the ground terminal sends the control message to the terminal It becomes impossible to perform control on the mounted terminal.

Accordingly, the present invention can provide a dynamic routing protocol interworking by using a virtual interface in a public data link system having multiple ports (high-speed and low-speed ports), thereby facilitating multicast channel implementation, We suggest a possible solution.

1. Virtual Interface Configuration

3 shows a network configuration diagram using a virtual interface in a public data link system according to an embodiment of the present invention.

As shown in FIG. 3, the public data link system according to the embodiment of the present invention includes a terrestrial terminal 10 and a plurality of on-board terminals 20-1 and 20-2.

The terrestrial terminal 10 comprises a first physical interface (POS) for high-speed data transmission, a plurality of second physical interfaces (TDM1, TDM2) for low-speed data transmission, A plurality of virtual network interfaces TAP1 and TAP2 each connected to a physical interface and a first and a second physical interface POS and TDM according to a transmission request speed or transmission type to the virtual network interfaces TAP1 and TAP2 dynamically And a device driver (not shown) for connection.

Each of the plurality of on-board terminals 20-1 and 20-2 includes one first and second physical interfaces (POS and TDM1), one virtual network interface (TAP1), and a device driver, Dynamically connects the first and second physical interfaces (POS, TDM) to the virtual network interface (TAP1) according to the transmission request speed or transmission mode.

The first physical interface (POS) may be a receiving port (a transmitting port on the basis of a mobile terminal) and the second physical interface (TDM) may be a transmitting and receiving port on a terrestrial terminal basis.

One virtual network interface (TAP1) is registered in each of the onboard terminals 20-1 and 20-2 through the above-described network configuration and each of the onboard terminals 20-1 and 20-2 The virtual network interfaces TAP1 and TAP2 corresponding to the virtual network interfaces registered in the virtual network interfaces are registered.

Referring to FIG. 3, the present invention registers a virtual network interface (TAP) in the kernel of the terrestrial terminal 10 and the loading terminals 20-1 and 20-2 using the TAP library and assigns an IP. The device driver performs a connection function between the virtual network interface and the physical interface. That is, the present invention registers as many virtual network interfaces (TAPs) as needed in the kernel using the TAP library and registers IP and MAC addresses for each. The physical interface includes a high speed port (POS) and a low speed port (TDM) and has a condition that a sufficient number of high speed interfaces are not provided. The device driver performs the function of dynamically connecting the physical interface (TDM, POS) to the virtual network interface (TAP) according to the transmission request speed or transmission type (unicast or multicast) among the available physical interfaces (TDM, POS) do.

Through the network structure, the terrestrial terminal 10 transmits the low-speed data (eg, control message) input through the virtual network interface TAP1 to the on-board terminal (TDM) through the second physical interface 20-1 and receives the high-speed data (eg, video) transmitted by the on-board terminal 20-1 through the first physical interface (POS), which is a high-speed receiving port, . As a result, the terrestrial terminal 10 receives the high-speed data (eg, video) from the mobile terminal 20-1 through the high-speed port (POS) and transmits the control message through the low-speed port TDM1, 1) can be continuously controlled.

 The terrestrial terminal 10 also transmits the low speed data input through the virtual network TAP2 to the mounting terminal 20-2 via the second physical interface TDM2 which is the low speed port TDM2, Speed data transmitted from the on-board terminal 20-2 through the interface (TDM) and transmit the low-speed data to the virtual network interface TAP1. For convenience of explanation, the first physical interface (POS) is abbreviated as a high-speed port, and the second physical interface (TDM) is abbreviated as a low-speed port.

2. Port reconfiguration according to the required speed

FIG. 4 is a diagram illustrating switching between high speed and low speed ports (port reconfiguration) using a virtual interface in a public data link system according to an embodiment of the present invention. Here, the transmitting and receiving ports are ports set to the ground terminal.

4, the terrestrial terminal 10 receives video information acquired by the mounting terminal 1 (20-1) and receives the video information from the mounting terminal 2 (20-2) in a high image quality can do. In this case, the device driver of the terrestrial terminal 10 switches the bidirectional low-speed port previously formed between the terrestrial terminal 10 and the loading terminal 2-2 to the unidirectional high-speed port.

To this end, the device driver first changes the receiving port of the virtual network interface (TAP1) from high-speed to low-speed (POS-> TDM1) and recovers a high-speed port (POS) As a result, all the virtual network interfaces TAP1 and TAP2 are in the low-speed transmission / reception state, and the high-speed port (POS) becomes available. This operation is also performed in the loading terminal 1 (20-1) under the control of the terrestrial terminal 10 (high-speed port assignment in the loading terminal).

Thereafter, the device driver transfers the high-speed port (POS) to the virtual network interface (TAP2) and the high-speed port (POS) to the virtual network interface (TAP1) in the land terminal (TDM2-> POS) for changing the receiving port of the virtual network interface (TAP2) and the transmitting port of the virtual network interface (TAP1) of the mounting terminal 2 (20-2) from low speed to high speed . Through the above port reconfiguration, the terrestrial terminal 10 continues to receive image information from the on-board terminal 2 (20-2) through the high-speed port (POS) and continues to the onboard terminal 2 (20-2) via the low- Can be controlled.

As described above, according to the present invention, by reconfiguring a port by performing switching between a high-speed / low-speed port on a virtual network interface dynamically according to a required transmission rate, i.e., high-speed or low-speed data, It is possible to receive high-speed image information from the mobile terminal.

3. Multicast Channel Configuration

5 is an embodiment of implementing a multicast service using a virtual interface in a public data link system according to an embodiment of the present invention.

As shown in FIG. 5, when the terrestrial terminal 10 transmits a control message commonly to a plurality of mobile terminals 20-1 to 20-4, that is, when the transmission mode is multicast transmission, Connects a plurality of virtual terminals (TAP1 to TAP4) to a specific low speed port (TDM1), and connects the plurality of mounting terminals (20-1 to 20-4) to the specific low speed port (TDM1). According to such a port configuration, the terrestrial terminal 10 can transmit control messages to terminals belonging to a group only by transmitting the packets only once without having to duplicate packets on a separate interface.

The ground terminal 10 uses one RF and an antenna even when it communicates with a plurality of the mounting terminals 20-1 to 20-4. In this case, the terrestrial terminal 10 is composed of N modems, one RF, and one antenna, and each of the terminals is composed of one modem, RF, and antenna. Since the terrestrial terminal 10 receives one antenna and RF and is divided into N modems at the time of reception, only one frequency band is used at the time of transmission. Therefore, one modem is used, so that one physical transmission interface is used none.

At this time, if each virtual network interface (TAP1 to TAP4) is connected to a predetermined transmission physical interface (TDM1), N mounted terminals and one ground terminal can have the same effect as N 1: 1 configurations. At this time, the virtual network interfaces (TAP1 to TAP4) may be a channel broadcasted to an on-board terminal group.

When the terrestrial terminal 10 receives video information from a plurality of the terminals 20-1 to 20-4, the device driver changes the reception ports of all the virtual network interfaces TAP1 to TAP4 from low speed to high speed , And performs port reconfiguration to allocate a high-speed port (POS) to all of the plurality of mounting terminals 20-1 to 20-4. As a result, all the image information transmitted from the plurality of on-board terminals 20-1 to 20-4 is received through the high-speed port (POS) of the terrestrial terminal 10 and then input to each of the virtual network interfaces TAP1 to TAP4 .

FIG. 6 is a flowchart of a high-speed port allocation for high-speed data transmission after allocating directional low-speed ports in the present invention.

As shown in FIG. 6, a device driver according to the present invention initially configures a TAP by allocating a terrestrial terminal and a virtual network interface (TAP) of a mounted terminal to a bidirectional low speed port (TDM) (S100). If high data reception is requested from the operator in this state, the device driver checks whether the high speed port (POS) is available (available state) (S110, S120). If it is determined that the high speed port (POS) is available, the device driver allocates a high speed port (POS) to the reception port of the terrestrial terminal and performs port reconfiguration to assign a high speed port (POS) to the transmission port of the onboard terminal ). At this time, a low speed port (TDM) is still allocated to the transmission port of the land terminal and the reception port of the mounting terminal.

Accordingly, the on-board terminal transmits the high-speed data to the terrestrial terminal via the assigned high-speed transmission port (POS), and the terrestrial terminal receives the high-speed data through the high-speed reception port (POS) (S140).

On the other hand, if it is determined in step S120 that the high-speed port POS is not available, that is, if the operation in step S140 is performed, the device driver transmits the requested high- (E.g., second high-speed data) transmitted from the on-board terminal to the terrestrial terminal through the current high-speed port (POS) (S150). If the priority of the first high-speed data is lower than the priority of the second high-speed data as a result of the comparison, the process is terminated.

On the other hand, if the priority of the requested first high-speed data is higher than that of the second high-speed data currently transmitted through the high-speed port (POS), the device driver retrieves the currently used high- A low speed port (TDM) is assigned to each of the reception port of the land terminal and the transmission port of the installation terminal (S160), and then the flow advances to step S130 to allocate a high speed port (POS) Speed port (POS) is assigned to the transmission port of the high speed port.

Therefore, even if the onboard terminal receives the second high-speed data through the high-speed port (POS), the onboard terminal transmits the first high-speed data having higher priority than the second high-speed data through the high-speed port switching in steps S160 and S130 (S140).

As described above, according to the present invention, in a public data link system having multiple ports (high-speed and low-speed ports), a dynamic routing protocol interworking is possible by configuring a network using a virtual interface, a multicast channel is easily implemented, There is an advantage that configuration can be changed.

The configuration and method of the above-described embodiments are not limited to the above-described public data link system having multiple ports and the network configuration method using the virtual interface according to the present invention, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive.

10: ground terminal 20-1 to 20-4:

Claims (13)

A public data link system for transmitting data between a terrestrial terminal and a plurality of mounted terminals via a physical interface,
A first physical interface for high speed data transfer;
A second physical interface for slow data transfer;
A virtual network interface registered in a terrestrial terminal and a kernel of a mobile terminal and connected to the first and second physical interfaces; And
And a device driver for dynamically connecting the first and second physical interfaces to the virtual network interface according to the transmission request speed or the transmission format of the data. 2. The apparatus of claim 1, wherein the first physical interface
Wherein the first physical interface is a receive port on a ground terminal basis and the second physical interface is a transmit and receive port on a terrestrial terminal basis. The method according to claim 1,
Wherein one virtual network interface is registered and a plurality of virtual network interfaces corresponding to virtual network interfaces registered in each of the plurality of mobile terminals are registered in the terrestrial terminal. The method of claim 1, wherein the virtual network interface
IP < / RTI > and MAC addresses are registered. The method of claim 1, wherein the device driver
When high-speed data is received from the first loading terminal through the receiving port of the first virtual network interface and high-speed data is received from the second loading terminal,
(a) receiving from the terrestrial terminal a first physical interface by switching the receiving port of the first virtual network interface from high speed to low speed,
(b) performs a port reconfiguration in which a receiving port of a second virtual network interface of a terrestrial terminal associated with the second on-board terminal is switched from a low speed to a high speed while maintaining a low speed transmitting port. 6. The method of claim 5, wherein the device driver
(a) switching the transmission port of the virtual network interface from the high-speed to the low-speed in the first loading terminal based on the port reconfiguration of the terrestrial terminal,
(b) The second terminal controls to reconfigure the previous low-speed transmission and reception ports into a high-speed transmission port and a low-speed reception port. The method of claim 1, wherein the device driver
When a transmission mode is multicast transmission, a plurality of virtual network interfaces registered in a terrestrial terminal are connected to one second physical interface to transmit a control message to a plurality of mobile terminals, and when receiving high-speed data, To the network interface of the public data link system. In a public data link system having multiple ports,
Registering a virtual network interface on a terrestrial and a kernel of a terminal equipped with the virtual network interface;
Performing data transmission between a land terminal and a loading terminal through a single first port for high-speed data and a plurality of second ports for low-speed data; And
And dynamically connecting first and second physical interfaces to the virtual network interface according to a transmission request rate or a transmission format of the data. 9. The method of claim 8,
High speed data or low speed data, and the data transmission type includes unicast or multicast. 9. The method of claim 8, wherein registering the virtual network interface
Registering one virtual network interface in the on-board terminal and registering a plurality of virtual network interfaces corresponding to the virtual network interfaces registered in the on-board terminals in the terrestrial terminal,
Wherein the first port is a receive port on a ground terminal basis and the second port is a transmit and receive port on a terrestrial terminal basis. 9. The method of claim 8, wherein the dynamically concatenating
The first port for high-speed reception and the second port for low-speed transmission are connected to one virtual interface according to the data transmission request speed,
And configuring a network such that a second port for low-speed transmission and reception is connected to the remaining virtual interfaces. 9. The method of claim 8, wherein the dynamically concatenating
When high-speed data is received from the first loading terminal through the first port and high-speed data is received from the second loading terminal through the first port,
(a) recovering a first physical interface by switching a receiving port of a first virtual network interface from a high speed to a low speed in a terrestrial terminal; And
(b) reconfiguring the network by switching the receiving port of the second virtual network interface of the land terminal associated with the second land mobile terminal from low speed to high speed while maintaining a low speed transmission port A method of network configuration of a data link system. 9. The method of claim 8, wherein the dynamically concatenating
If the data transmission format is multicast,
(a) connecting a plurality of virtual network interfaces registered in a terrestrial terminal to one second physical interface; And
(b) reconfiguring the network by connecting a plurality of on-board terminals to the second physical interface.

Images