KR20140138436A - Infrared communication method through signal relay in multiple node and infrared communication device - Google Patents

Abstract

The present invention relates to an apparatus and method using infrared communications and, more specifically, to an infrared communication apparatus for performing infrared communications using signal relay through multiple nodes and an infrared communication method using the same. The infrared communication apparatus is provided in each node in an infrared communication system performing infrared communications using signal relay through multiple nodes. The infrared communication apparatus includes: a first infrared communication unit provided towards a first node, and configured to receive a first signal from the first node; a second infrared communication unit provided towards a second node in a direction opposite to the first node, and configured to transmit a second signal corresponding to the first signal to the direction of the second node when the first signal is received through the first infrared communication unit; and a control unit configured to control the second signal to be transmitted through the second infrared communication unit when the first signal needs to be transmitted to the second node. According to the present invention, conventional infrared communications performed between two terminals may extend to communications between multiple nodes. Accordingly, the infrared communication apparatus may be reduced in cost and applied to be various fields.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared communication method and apparatus for performing infrared communication using signal relaying in a plurality of nodes,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared communication system, and more particularly to a system for transmitting data through an infrared communication method when communication is performed through a plurality of nodes.

The most widely used method of wireless communication is a method of communicating using signals in the radio frequency domain.

Since the signal in the radio frequency domain propagates in all directions and has a diffracting property, there is a merit that the blind spot where the signal can not reach is relatively small.

Therefore, such a radio frequency signal can be very useful when transmitting signals to a plurality of terminals or transmitting signals to terminals that do not know where they are.

However, there is a drawback that the equipment is relatively complicated and the production cost of the equipment is expensive.

On the other hand, optical communication such as infrared light is advantageous in that the equipment is simple and the production cost is relatively low.

However, infrared rays have strong disadvantages such as difficulty in communication when there is an obstacle in the middle or a direction that is not precisely aligned.

In the optical wireless communication method using an infrared ray, a light emitting device such as a light emitting device (LED), a laser diode (PD), and a photodiode (PD) Or 1: N connections.

In the case of the direct light connection method, there must be no obstacle on the path of the light, there is a disadvantage that the position adjustment between each other and the reflection on the wall surface or the ceiling can not be used. In case of the diffusion method, There are relatively many advantages such as overcoming obstacles and simplifying the position adjustment. However, there is no known spreading technique that can transmit and receive optical signals regardless of position, and there is no common point of view using reflection of the ceiling or reflection of the wall The position adjustment was required to have a common orientation point between the modules.

In this way, even if the infrared communication method is a direct connection method or a diffusion method, if the direction is slightly different due to the directivity of infrared rays, communication is not possible. Therefore, a method of setting a direction for connection between two optical modules It has become the main research subject.

Open No. 2000-25312 discloses a method and system for connecting two optical modules when communicating using such an infrared signal.

The invention described above is characterized in that it is capable of directing infrared rays from an infrared communication device by using visible light in addition to infrared rays so that communication can be accurately performed when an apparatus for communicating with an infrared signal is fixed. to be.

In the case of infrared communication, the conventional research method mainly focuses on a direction setting method for communication between two optical modules, and no research has been conducted on a method of linking and processing a plurality of optical modules.

[Patent Document 1] Korean Unexamined Patent Application Publication No. 2000-25312 (published on May 5, 2000) (Structure of Infrared Wireless Optical Communication Module and Method of Adjusting Position and Direction of Infrared Wireless Optical Module)

In order to solve the above-described problems, it is an object of the present invention to provide a system and method for relaying signals through an infrared communication in an infrared communication system having a plurality of nodes.

In order to solve the above problems, the present invention provides a computer-readable recording medium on which a program for realizing the above-described method is recorded.

According to an aspect of the present invention, there is provided an infrared communication apparatus provided in each node in an infrared communication system for performing infrared communication through signal relay through a plurality of nodes, the infrared communication apparatus being installed toward a first node, A first infrared communication unit for receiving a first signal from a node; And a second infrared communication unit which is installed toward a second node in a direction different from the first node and transmits the second signal corresponding to the first signal toward the second node when the first signal is received through the first infrared communication unit, 2 infrared communication unit; And a control unit controlling the second signal to be transmitted through the second infrared communication unit when the first signal is a signal to be transmitted to the second node. An infrared communication device for performing infrared communication is provided.

According to another aspect of the present invention, there is provided an infrared communication method using an infrared communication device provided in each node in an infrared communication system for performing infrared communication through signal relay through a plurality of nodes, Receiving a first signal from the first node from a first infrared communication unit installed to the first infrared communication unit; Determining whether the first signal is a signal to be transmitted to the second node; And a second infrared communication unit that is installed toward a second node, which is different from the first node, determines that the first signal is a signal that should be transmitted to the second node, and transmits a second signal corresponding to the first signal And transmitting the generated signal to the second node in the direction of the second node. The infrared communication method for performing infrared communication using signal relay in a plurality of nodes.

Here, it is preferable that the first infrared communication unit and the second infrared communication unit perform infrared communication using a laser diode.

It is preferable that the first infrared communication unit and the second infrared communication unit further include a shielding film for blocking a signal from a direction other than the first node direction so as not to receive a signal generated from a node other than the first node Do.

The infrared communication device may further include an illuminating unit for illuminating the underground parking space, wherein the control unit controls the first signal to include the control information for controlling the illuminating unit, And controls the illumination unit according to the information.

The infra-red communication device may further include an entrance sensing unit for sensing an entry of objects within a predetermined sensing distance, and the control unit may control the illuminating unit to illuminate the lighting unit when an entry of the object is detected by the entrance sensing unit. And controls the first infrared communication unit and the second infrared communication unit to transmit a signal for instructing illumination of the neighboring node to be brightened.

In addition, the first signal includes information on the number of nodes to illuminate the illumination, and the second signal may include information on the number of nodes to illuminate the illumination included in the first signal, It is preferable to include information subtracted by a predetermined number from information on the number of nodes to be brightened.

It is preferable that the control unit does not generate the second signal when the information on the number of nodes to illuminate the first signal does not include information for illuminating the second node Do.

In order to achieve the above object, the present invention provides a computer-readable recording medium on which a program for realizing the above-described method is recorded.

According to the present invention, it is possible to expand the infrared communication, which has been performed only between two existing terminals, to a communication between a plurality of nodes. Accordingly, the infrared communication device can be applied to various fields using an inexpensive infrared communication device .

1 is a view showing a configuration of an embodiment of the present invention;
2 is a view showing the configuration of another embodiment of the present invention
3 to 6 are views showing a specific example in which the apparatus of Fig. 2 is applied
Figure 7 illustrates an embodiment of the method of the present invention
8 is a view showing a specific example in which the present invention is applied to an illumination system of an underground parking lot

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The present invention relates to an infrared communication system having an infrared communication device having a plurality of nodes and performing infrared communication with each node, and an infrared communication system capable of transmitting a signal to a desired node by a signal relaying method between the nodes.

1 is a block diagram showing a configuration of an embodiment of the present invention.

The infrared communication device of the present invention includes a first infrared ray communication unit 110, a second infrared ray communication unit 120, and a control unit 130.

The first infrared ray communication unit 110 and the second infrared ray communication unit 120 are components that communicate using an infrared communication method.

The first infrared ray communication unit 110 and the second infrared ray communication unit 120 use a component such as a laser diode for transmitting light in the infrared ray region and transmit a component for receiving the infrared ray signal and a component for transmitting the infrared ray signal Respectively.

Since the method of infrared communication is the same as that of the conventional infrared communication method, a detailed description of the method is omitted.

In the present invention, since the infrared communication does not use the diffusion method, it is more preferable to use an LD (laser diode) rather than an LED.

The first infrared ray communication unit 110 and the second infrared ray communication unit 120 can both perform transmission and reception functions. Here, for convenience of description, the first infrared ray communication unit 110 refers to a communication module performing a receiving function And the second infrared ray communication unit 120 refers to a communication module that performs a transmission function.

The first infrared communication unit 110 of each node receives a first signal, which is an infrared signal transmitted from another neighboring node, and transmits a second signal corresponding to the first signal under the control of the controller 130 to a second infrared communication unit (120).

The first infrared ray communication unit 110 and the second infrared ray communication unit 120 perform both transmission and reception functions and thus receive the infrared ray signal through the second infrared ray communication unit 120, 110 to transmit the infrared signal.

The first infrared ray communication unit 110 is installed toward a first node among neighboring nodes and the second infrared ray communication unit 120 is installed toward a second one of neighboring nodes.

Here, the first and second nodes are installed in different directions, and accordingly, the first infrared communication unit 110 and the second infrared communication unit 120 respectively transmit the first node direction and the second node direction, Lt; / RTI > In the present embodiment, an example in which a signal is transmitted from the first node will be mainly described.

In FIG. 1, the first infrared ray communication unit 110 and the second infrared ray communication unit 120 are installed in opposite directions. However, the first infrared ray communication unit 110 and the second infrared ray communication unit 120 are not necessarily arranged to have different angles such as 90 degrees. May be installed.

The angle at which the first infrared communication unit 110 and the second infrared communication unit 120 are installed can be determined according to the position of the node of the entire system.

In FIG. 1, it is shown that only two infrared communication modules are provided, i.e., the first infrared communication unit 110 and the second infrared communication unit 120, but it is also possible to include a plurality of infrared communication modules.

That is, infrared signals may be received from a plurality of nodes, and infrared signals may be transmitted to a plurality of nodes.

However, even in this case, one infrared communication module communicates with only one predetermined node.

Another infrared signal may be transmitted to the outside of the first infrared communication unit 110 and the second infrared communication unit 120 in order to prevent a signal from being transmitted to a node other than the predetermined node or a signal transmitted from another predetermined node to be received. It is possible to further provide a blocking film 111 which is not provided.

In the case of further providing a shielding film, it is possible not only to prevent a signal from being received from a place other than a predetermined node but also to prevent an infrared signal from diffusing in an unwanted direction even during transmission.

The first infrared ray communication unit 110 and the second infrared ray communication unit 120 of each node are arranged on the same plane so that when the front infrared ray communication apparatus (node) is installed, the first infrared ray communication unit 110 of each node, And the height of the second infrared ray communication unit 120 are different from each other.

However, this condition is not essential for the convenience of installation, and it is only necessary that the first infrared communication unit 110 and the second infrared communication unit 120 are installed so as to perform infrared communication with the neighboring node.

On the other hand, basically, the first infrared ray communication unit 110 is installed such that only the signal transmitted from the first node is received. However, this is an effect according to the installation direction, Can also be received.

For example, a user may transmit an infrared signal to the first infrared ray communication unit 110 using a separate remote controller. The user may transmit a signal to transmit the direction of the remote control in a direction that the first infrared ray communication unit 110 faces.

When the first signal is received from the neighboring node through the first infrared ray communication unit 110, the control unit 130 determines whether the signal is a signal to be relayed. If the signal is a signal to be relayed, And generates a second signal corresponding to the signal to be transmitted through the second infrared communication unit 120.

The signal corresponding to the first signal may be the same signal as the first signal, and the data for the relay may be a modified signal.

For example, when an infrared signal is generated and transmitted from a node according to the present invention, the signal may include control information for the basis on which the signal is generated and information about signal relaying.

The control information for the basis on which the signal is generated is a signal for driving the electronic equipment to which the infrared communication device of the present invention is connected. For example, when the infrared communication device of the present invention is connected to the illumination lamp, Lt; / RTI >

The information about the signal relay is information about the destination of data transmission.

For example, when a signal is to be transmitted to all five or five nodes connected by an infrared communication method from a node where an infrared signal is generated, information about the signal may be included.

If there is unique identification information for each node, identification information of the node may be included and transmitted. In this case, the first signal and the second signal will have the same information contained in the signal.

However, in such a case, identification information must be assigned to many nodes, and information about the position of the node corresponding to each identification information must be stored in each infrared communication device, so that the system installation is complicated and infrared communication is used It is more desirable to make each node available without giving identification information because the merit of simple installation and operation may be discolored.

For example, it is possible to include information corresponding to the number of nodes to the final destination node, and reduce the number of the nodes by one at each node that receives the signal, and transmit the same to the neighboring node again.

Specifically, when a signal is transmitted to the fifth node connected to the current node, the information about the signal relay is transmitted to the immediately adjacent node (first node) by setting the information about the signal relay to 5, and the control unit of the first node, 4 to the second node.

When the signal arrives at the fifth node in this way, the signal information for the relay is 1.

The control unit of the fifth node receiving the signal having the signal relay information of 1 performs the operation according to the control information included in the signal, without further transmitting the signal to the other node.

When transmitting a signal, as in the above example, only one specific node may be designated as the destination node, but a plurality of nodes may be designated.

In the above example, the signal may be transmitted from the node where the first signal is generated to the fifth node so that the operation according to the control information included in the signal may be performed at the fifth node. However, in the first to fifth node modes, .

In addition, it may be possible to perform a corresponding operation at a plurality of specific nodes such as the second and fifth nodes.

2 is a block diagram showing a configuration of an apparatus used in each node when the infrared communication system of the present invention is applied to an illumination system of an underground parking lot according to another embodiment of the present invention.

The apparatus used in each node includes a first infrared ray communication unit 210, a second infrared ray communication unit 220, a control unit 230, an illumination unit 240, and an entry detection unit 250.

The first infrared communication unit 210, the second infrared communication unit 220 and the control unit 230 are the same as the functions performed by the first infrared communication unit 110, the second infrared communication unit 120, Function.

That is, the function related to the infrared communication is performed in the same manner as in FIG.

Specifically, the first infrared communication unit 210 is installed toward the first node and receives a first signal, which is an infrared signal transmitted from the first node.

The second infrared communication unit 220 is installed toward the second node and transmits a second signal corresponding to the first signal to the second node under the control of the controller 230 when the first signal is received.

When the first signal is received from the neighboring node through the first infrared communication unit 210, the control unit 230 determines whether the signal is a signal that should be relayed. If the signal is a signal to be relayed, And generates a second signal corresponding to the signal and transmits the second signal through the second infrared communication unit 220.

As described above, the first signal includes various control information and signal relaying information, and the second signal can change the signal relaying information.

In this embodiment, the control unit 230 also functions to control the illumination of the underground parking area in addition to the above functions.

For example, if the information about the signal relay included in the received first signal indicates that the node in which the control unit 230 is installed is influenced by the control information, and the control information includes information to turn on the illumination lamp And controls the illumination unit 240, which will be described later, so that the illumination is turned on.

In this case, when entry of a vehicle or a person is not detected by the entry detection unit 250, the control unit 250 controls the vehicle to be turned off automatically for a predetermined period of time and then turned off automatically.

As another example, the control unit 230 controls the illumination unit 240 to illuminate when a vehicle, a person, or the like enters the detection distance by the entrance detection unit 250 described later.

In this case, the first infrared ray communication unit 210 and the second infrared ray communication unit 220 are controlled to transmit a signal to the adjacent node for a predetermined period of time.

The illumination unit 240 turns on and off the illumination under the control of the control unit 230.

As the illumination to be turned on by the illumination unit 240, a variety of existing types of illumination such as LED, fluorescent lamp, and incandescent lamp may be used, and there is no limitation on the type.

Also, a method for controlling the lighting of the illumination can be used, and the same method as that for automatically turning off the illumination in the conventional illumination device can be used.

The entry detection unit 250 detects whether a person or a car enters the detection distance.

The sensors used for the entry detection unit 250 may be sensors for sensing the movement of objects or sensors for detecting heat, and sensors for detecting entry of people or objects within a distance sensible by the sensors Both can be used.

3 to 6 show a specific example in which the configuration of FIG. 2 is applied.

The same reference numerals are used for components performing the same functions as those of FIG.

3 to 6 are views showing the external shape, and the control unit 230 is not shown separately because it is installed inside.

3 illustrates an example in which the center illumination unit 240 is provided to perform the illumination function and the first infrared communication unit 210 and the second infrared communication unit 220 are provided at opposite ends in opposite directions.

3, the entry detection unit 250 is provided only on the first infrared communication unit 210, but it may be provided on both sides. The above description can be applied to the following drawings.

4 is a perspective view of the illuminating unit 240. The illuminating unit 240 is divided into two parts and the entrance sensing unit 250 is disposed at the center. The first infrared communication unit 210 and the second infrared communication unit 220 are provided.

5 shows an example in which the first infrared ray communication unit 210 and the second infrared ray communication unit 220 are directed in opposite directions to each other, The first infrared ray communication unit 210 and the second infrared ray communication unit 220 are provided together.

6 shows an example in which a part performing communication is detachably connected.

The first infrared ray communication unit 210 and the second infrared ray communication unit 220 may be coupled to the entrance detection unit 250 or may be detached from the illumination unit 240.

In this case, the control unit 230 may be included in the case of the first infrared ray communication unit 210 or the second infrared ray communication unit 220, or may be provided in the case of the illumination unit 240.

In Fig. 6, each component is wired.

On the other hand, FIG. 7 is a flowchart showing a method of lighting control using the apparatus of FIG.

First, the entry detection unit 250 detects whether an object such as a person or an automobile enters the detection distance (701).

The sensors used for the entry detection unit 250 may be sensors for sensing the movement of objects or sensors for detecting heat, and sensors for detecting entry of people or objects within a distance sensible by the sensors As described above.

If it is detected that a person or an object has entered, the control unit 230 controls the lighting unit 240 to be turned on (702).

At this time, it is preferable that the time to turn off the light is after a predetermined time has elapsed after the entry detection state is ended.

Meanwhile, the control unit 230 transmits a signal to turn on the neighboring node through the first infrared communication unit 210 and the second infrared communication unit 220 (703).

The signals transmitted at this time include control information indicating lighting and signal relaying information, which is information about the number of nodes to be lighted.

The size of the area illuminated at once is determined according to the size of the number of nodes to be lighted when an automobile is detected. The number of nodes to be lit can be determined by the system designer or operator.

In this way, according to the present invention, when the automobile or the like enters the automobile while the unlit state or the dim state of the light is maintained at normal times, unnecessary power consumption can be prevented.

On the other hand, in a state in which no entry is detected by the entry detection unit 250, the illumination unit 240 is turned on when a signal for lighting is transmitted from a neighboring node.

The first infrared communication unit 210 receives the first infrared communication unit 210 that instructs the first infrared communication unit 210 to turn on the first infrared communication unit 210. The first infrared communication unit 210 receives the signal from the first node, If it is determined in step 704 that the signal is a signal for instructing lighting of the corresponding node, the control unit 230 lights up the illumination unit 240 (705).

After the illumination is detected by the entry sensing unit 250, the entrance sensing unit 250 is turned off according to the step 703, and when the entry sensing unit 250 does not sense entry of the entrance sensing unit 250, It is preferable to automatically turn off the power source.

The control unit 230 checks whether the received first signal is a signal requiring relaying (Step 706), generates a second signal corresponding to the first signal if it is a signal requiring relaying (Step 707) Through the infrared communication unit 220 (708).

The relation between the first signal and the second signal may be different for the contents of the information for signal relaying. If the identification information is added for each node, the same information is obtained. However, as described above, The second signal is changed to information obtained by subtracting a predetermined number (usually 1 ') of information on the number of nodes to be lighted by the first signal from the above.

If the information for the signal relay in the received first signal is confirmed to no longer require signal relaying (when the information for signal relaying indicates '1' in the description with reference to FIG. 1), the controller 230 The procedure is terminated without generating the second signal any more.

Fig. 8 is a view for showing an example in which lighting is performed according to the present invention. Fig.

In FIG. 8, the first infrared communication unit 210 and the second infrared communication unit 220 are not separately described for simplicity of description.

In Fig. 8, it is assumed that the number of neighboring nodes that are turned on at one time is two.

When the automobile enters, a signal for lighting from the node 800 that senses the entry of the automobile is transmitted to both nodes, and the first nodes 801 and 811 on both sides transmit information for signal relay as 2, The second node 802 or 812 transmits information for signal relaying as 1s.

When an automobile enters the vehicle, five consecutive lights are turned on. When the automobile continues to advance and comes to the position of the node 801, a signal for lighting from the node 801 is transmitted again to the nodes 803, 802, 801, 800, and 811 are turned on, and the node 812 that has been turned on automatically turns off after a predetermined time.

In the present invention, the expression lighting up and lighting off is used to describe the lighting unit 240, but the meaning of lighting up and lighting off in the present invention includes not only meaning of complete lighting, but also relative meaning of brightness of illumination.

That is, the meaning of lighting off in the present invention is used not only to completely turn off illumination but also to include a concept of relatively dimming of illumination.

Therefore, in the above description, the concept of turning on and off the illumination is used as a concept including a concept of controlling the illumination in a dimming-controllable device.

The method of the present invention can also be embodied as computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

Claims (13)

1. An infrared communication apparatus provided in each node in an infrared communication system for performing infrared communication through signal relay through a plurality of nodes,
A first infrared communication unit installed toward the first node and receiving a first signal from the first node;
And a second infrared communication unit which is installed toward a second node in a direction different from the first node and transmits the second signal corresponding to the first signal toward the second node when the first signal is received through the first infrared communication unit, 2 infrared communication unit; And
And a controller for controlling the second signal to be transmitted through the second infrared communication unit when the first signal is a signal to be transmitted to the second node. An infrared communication device performing communication. The infrared ray communication apparatus according to claim 1, wherein the first infrared ray communication unit and the second infrared ray communication unit perform infrared ray communication using a laser diode, wherein the plurality of nodes perform infrared ray communication using signal relay. [2] The apparatus of claim 1, wherein the first infrared communication unit further comprises a blocking layer for blocking a signal from a direction other than the first node direction so as not to receive a signal generated from a node other than the first node Wherein the plurality of nodes perform infrared communication using signal relay. The infrared communication device according to claim 1, wherein the infrared communication device is applied to an illumination system of an underground parking lot,
And an illumination unit for illumination,
Wherein the control unit controls the illumination unit according to the control information when control information for controlling the illumination unit is included in the first signal. Device. 5. The apparatus according to claim 4, wherein the infrared communication device
Further comprising: an entrance detection unit detecting an entry of an object within a predetermined detection distance,
The control unit controls the illuminating unit to illuminate the illuminating unit when an entry of the object is sensed by the entrance sensing unit, and transmits a signal to the illuminating unit to illuminate the neighboring node through the first infrared communication unit and the second infrared communication unit. Wherein the plurality of nodes perform infrared communication using signal relay. 5. The method of claim 4, wherein the first signal includes information on the number of nodes to illuminate the light,
The second signal includes information obtained by subtracting a predetermined number of pieces of information on the number of nodes to be illuminated by the control unit, instead of information on the number of nodes to illuminate the illumination included in the first signal. An infrared communication device for performing infrared communication using signal relaying at a plurality of nodes. [7] The method of claim 6, wherein the control unit does not generate the second signal when the information on the number of nodes for illuminating the first signal does not include information for illuminating the second node Wherein the plurality of nodes perform infrared communication using signal relay. 1. An infrared communication method using an infrared communication device provided in each node in an infrared communication system for performing infrared communication through signal relay through a plurality of nodes,
Receiving a first signal from the first node from a first infrared communication unit installed toward the first node;
Determining whether the first signal is a signal to be transmitted to the second node;
And generating a second signal corresponding to the first signal when it is determined that the first signal is a signal to be transmitted to the second node through the second infrared communication unit installed toward the second node which is different from the first node, And transmitting the infrared signal to the second node in the direction of the second node. The method of claim 8, wherein the infrared communication method is applied to an illumination system of an underground parking lot,
And controlling the illumination unit according to the control information when control information for controlling the illumination unit connected to the first signal is included in the control signal. Infrared communication method. The method of claim 9, wherein the infrared communication method comprises:
Sensing an entry of an object within a predetermined sensing distance;
Controlling the lighting of the illumination unit to be bright when the entry of the object is sensed;
Further comprising the step of transmitting a signal instructing the neighboring node to brighten the illumination through the first infrared communication unit and the second infrared communication unit. Communication method. 10. The method of claim 9, wherein the first signal includes information on the number of nodes to illuminate the light,
Wherein the second signal includes information obtained by subtracting a predetermined number of information from the information on the number of nodes to illuminate the illumination instead of information on the number of nodes to illuminate the illumination included in the first signal. In which infrared communication is performed using a signal relay. 10. The method of claim 9, wherein if the information about the number of nodes to illuminate the first signal does not include information for illuminating the second node, Wherein the plurality of nodes perform infrared communication using signal relay. A computer-readable recording medium storing a program for realizing the method according to any one of claims 8 to 12.

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