KR20090059343A - Visible light communication network system containing intelligent streetlight - Google Patents

Abstract

A visible light communication network system is provided to transmit and receive data between an intelligent street light and a control device by using a visible light communication. A visible light communication network system includes an intelligent street light(100,102) and a control device(104). The intelligent street light transmits data collected by an observing device to the control device through visible light communication. An operation of the intelligent street light is controlled by a control signal of the control device. The control device receives the data from the intelligent street light through the visible light communication. The control device transmits the control signal to the intelligent street light through the visible light communication. The intelligent street light retransmits a received optical signal to an adjacent intelligent street light or visible light communication terminals(108,110,112,116). The intelligent street light performs a role of an Ethernet hub for providing a wireless sharing service to the visible light communication terminal.

Description

Visible light communication network system including intelligent street light {VISIBLE LIGHT COMMUNICATION NETWORK SYSTEM CONTAINING INTELLIGENT STREETLIGHT}

The present invention relates to a visible light communication network system including an intelligent street light, in particular, by enabling the visible light communication using the LED lamp provided in the intelligent street light as a light source, to provide a network connection to the visible light communication terminal around the intelligent street light or In this way, the visible light communication is used as a communication method between the intelligent street light and the control device, and the intelligent street light that communicates the walking signal or emergency situation in front of the intelligent street light through the visible light communication to inform the rear street of the intelligent street light. A visible optical communication network system is included.

Streetlights have been merely a role of conventional lighting, but with the recent development of technology, many functions have been added. For example, by remotely detecting the normal operation of the street lamp to quickly recover if there is a problem with the lighting of the street lamp, or through the CCTV and speakers attached to the street lamp, performing the music broadcasting, announcement broadcasting and monitoring functions The lamp is provided by a street lamp.

The reason why many functions are added to street lamps is that many street lamps have been installed in order to allow citizens to be active at night in urban space, and it is inefficient to make such street lamps only have lighting functions. Moreover, with the recent development of ubiquitous technology, the network environment is being improved to enable network access anywhere in the city, which is accelerating the integration of IT (Information Technology) for street lamps in every corner of the city. . As a result, intelligent streetlights, which serve as a type of hub for attaching sensors and cameras to streetlights in real time and enabling network connection, are being introduced.

On the other hand, visible light communication is a communication using a visible radio wave, the light of the LED light and the like to repeat the on and off at a very high speed that the eye can not feel, and the light receiving unit detects this communication. For example, it is possible to communicate by sending and receiving digital signals with the on state 1 and the off state 0.

Intelligent street lamps are preferably used as LED lighting lamps that can control the color and illuminance. In this case, when the LED lamp is used as a light source and the light receiving device and the visible light communication control device are connected, the visible light communication network may be configured by an intelligent street lamp. However, there is a problem that there is no technology that uses network configuration such as intelligent streetlight as a visible light communication method, a technology for providing a network connection to a nearby visible light communication terminal using visible light communication, or a technology for notifying a traffic situation in front of the street in advance. there was.

The technical problem to be achieved by the present invention is to improve the problems of the prior art described above, by using visible light communication as a communication method between the intelligent street light or between the intelligent street light and the control device, providing a connection to the network to the visible light communication terminal. Another object is to provide a visible light communication network system including an intelligent street light that propagates an emergency situation in front of a road to a driver behind the road.

As a means for solving the object of the present invention, the present invention transmits the data collected by the provided observation equipment to the control device through the visible light communication and the intelligent control operation by receiving the control signal of the control device through the visible light communication Visible light communication network system including a control device for controlling the intelligent street light by transmitting a control signal through the visible light communication to the intelligent street light to receive, store and control the data collected by the street light and the intelligent street light through the visible light communication To provide.

Visible light communication between the intelligent street light and the control device is a way that the intelligent street light between the intelligent street light and the control device for transmitting and receiving data relays the optical signal (Relay).

In addition, the visible light communication uses a TCP / IP stack as a communication protocol set, of which Ethernet is used as a protocol corresponding to a data link layer. For example, it is preferable to perform visible light communication by modulating an Ethernet frame into an optical signal and then transmitting it through visible light communication, and receiving the optical signal and demodulating the Ethernet frame. In other words, the overall operation is the same as the Ethernet network, it is preferable that the only way to communicate by modulating the Ethernet frame to the optical signal between the visible light communication terminal, intelligent street light, and the like.

The intelligent street light retransmits the optical signal received to the adjacent intelligent street light or visible light communication terminal, and serves as an Ethernet hub, thereby providing short-range and long distance wireless sharing service to the visible light communication terminal. .

The intelligent street light, when the front traffic situation guidance signal is received through visible light communication, informs the traffic situation in front of the LED lamp flickering, change of illumination color, warning sound reproduction and warning message display, and transmits the received signal to the visible light communication terminal. It is preferable to retransmit to the visible light communication terminal to notify the traffic situation in front of the warning sound reproduction and warning message display.

In addition, the intelligent street light is recognized as an emergency situation by the camera equipped with an emergency situation, such as unauthorized crossings, traffic accidents, or when the emergency button is pressed, the LED lamp flashes, changes in lighting color, warning sound reproduction, and warning message display. It is desirable to transmit a front traffic situation guidance signal that informs and informs the occurrence of an emergency situation to the rear intelligent street light.

The visible light communication network system notifies the occurrence of a pedestrian signal at the rear by transmitting a forward traffic situation guide signal indicating the occurrence of a pedestrian signal to an adjacent intelligent street when the pedestrian signal is generated through visible light communication, and indicates a stop when the pedestrian signal is generated. It is preferable to further include a pedestrian crossing embedded LED lamp that lights in a color such as red.

As another means for solving the object of the present invention, the present invention modulates a communication frame provided from the hub into an optical signal, and then modulates an optical signal by controlling the LED lamp group, the optical signal by the control of the optical modulator LED lamp group to emit, the optical signal to recognize the optical signal is converted into an electrical demodulation unit provided to the optical demodulation unit, the optical demodulation unit for receiving the electrical signal from the light receiving unit and demodulated in a communication frame provided to the hub, the optical modulation unit By connecting the optical demodulation unit and other Ethernet communication equipment, it provides an intelligent street light capable of visible light communication including a hub for retransmitting a communication frame transmitted by one of the equipment to all other connected equipment.

According to the present invention, by providing a connection to the visible light communication terminal in the vicinity of the intelligent street light to provide services such as sharing of the visible light communication terminals, and the signal generated from the camera, various sensors provided in the intelligent street light Visible light communication can be transmitted to the control center, on the contrary, the control center can transmit lighting and sound control signals of each intelligent street light through the visible light communication. In addition, when a situation in which a driver behind the scenes, such as an emergency situation in front of the road or a pedestrian signal needs to be informed, occurs, the LED lamp flashes, a sound signal, and a visible light communication is transmitted to a visible light communication terminal inside the vehicle. To inform the driver behind the scenes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, detailed descriptions of well-known functions and configurations will be omitted for clarity. In addition, in describing the present invention with reference to the drawings, components that perform the same function will be described with the same reference numerals.

In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

A configuration of a visible light communication network system including an intelligent street light according to the present invention will be described with reference to FIG. 1.

The visible light communication network system of the present invention includes one or more intelligent street lights. In FIG. 1, for convenience of description, it is assumed that a visible light communication network system including two intelligent street lights 100 and 102, four visible light communication terminals 108, 110, 112, and 116 and a control device 104 is described.

As shown in Figure 1, the visible light communication network system of the present invention intelligent street light (100, 102), visible light communication terminals (108, 110, 112, 116), control device 104 and crosswalk buried LED lamp 118 ).

Intelligent street light (100, 102) uses an LED lamp as a light source, and further includes a light receiving unit and a visible light communication control unit, and visible light communication with adjacent intelligent street light, visible light communication terminals (108, 110, 112) and control device 104 This is possible.

The intelligent street lamps 100 and 102 transmit camera photographed images, data collected by sensors such as zigbees, and the like to the control device 104 through visible light communication, and illuminate, sound effects, and display through the visible light communication from the control device 104. The operation related to the control is controlled.

It is preferable to use a TCP / IP stack as a communication protocol of the visible light communication, and Ethernet is preferably used as a protocol corresponding to a data link layer. That is, the intelligent street light (100, 102) and the visible light communication terminal (108, 110, 112, 116) network system of the present invention modulates an Ethernet frame into an optical signal to transmit and receive between each visible light communication device, internally It is desirable to process Ethernet frames by the TCP / IP protocol.

In particular, each intelligent street light (100, 102) serves as an Ethernet hub (Bubb) by broadcasting the light signal received to it again through the LED lamp provided in it.

The controller 104 receives various data collected by the intelligent street lamps 100 and 102 in the visible light communication method, and then controls the operation of each intelligent street light in the visible light communication method. In addition, it provides an Internet connection to the visible light communication terminals 108, 110, 112, 116 connected to the Internet (106) and connected to the intelligent street light (100, 102).

The visible light communication terminals 108, 110, 112, and 116 transmit and receive the intelligent street lamps 100 and 102 by modulating an Ethernet frame with an optical signal. The visible light communication terminals 108, 110, and 112 are devices having an adapter for supporting visible light communication, and may be equipment such as a mobile phone, a PDA, a notebook computer, and the like.

In the visible light communication network of the present invention, the intelligent street lamps 100 and 102 serve as hubs, and each of the visible light communication terminals 108, 110, 112 and 116 and the control device 104 serve as Ethernet terminals. Area Network).

Therefore, each visible light communication terminal (108, 110, 112, 116) is capable of file sharing between each terminal, and can be connected to the Internet through a control device connected to the Internet.

The control device 104 undergoes user authentication for the visible light communication terminals 108, 110, 112, and 116 connected to the visible light communication network of the present invention, and cuts the connection with the terminal that fails user authentication. , 102 is preferred.

The user authentication operation is preferably based on the MAC (Media Access Control) address or user ID and password of the visible light communication terminal.

When the pedestrian crossing embedded LED lamp 118 transmits an optical signal informing the occurrence of the walking signal to the adjacent intelligent street lights (100, 102) when the walking signal is generated, it informs the generation of the walking signal to the rear.

The pedestrian crossing buried LED lamp 118 is preferably turned on in a color such as red to stop the pedestrian signal generation so that the driver can recognize the generation of the pedestrian signal more clearly.

The configuration of the intelligent street light according to the present invention will be described with reference to FIG.

As shown in FIG. 2, the intelligent street lamp of the present invention includes an LED lamp group 200, a light receiving unit 202, an optical demodulation unit 204, an optical modulator 206, an illumination control unit 208, and a hub 210. , Sensor group 212, sound and image control unit 214, emergency button control unit 216 and the like.

The LED lamp group 200 is responsible for the lighting that is the main role of the street light under the control of the lighting control unit 208, and at the same time serves to emit visible light under the control of the light modulator 206 as a light source of visible light communication. LED lamp group 200 is preferably located at the upper end of the intelligent street light of the present invention, so that the visible light emission direction to the visible light communication terminal toward the LED lamp group, the lower end to each adjacent intelligent street light so as to emit visible light to the terminal It is preferable that it consists of LED lamp groups.

The light receiving unit 202 recognizes the visible light emitted from the adjacent intelligent street light (100, 102) or the visible light communication terminal (108, 110, 112, 116), converts the blinking of the visible light into an electrical signal, and then the optical demodulator (204) To provide.

The optical demodulator 204 demodulates an electrical signal provided by the light receiver 202, converts the electrical signal into an Ethernet frame, and provides the same to the hub 210.

The light modulator 206 converts the Ethernet frame provided from the hub 210 into an optical signal to control the LED lamp group 200 to be emitted through the LED lamp group 200. Note that, unlike other Ethernet equipment, the optical modulation unit 206 LED lamps all received Ethernet frames even if the destination MAC address included in the Ethernet frame provided from the hub 210 does not match its MAC address. The LED lamp group 200 is controlled to be emitted through the group 200. By doing so, the visible light communication terminals 108, 110, 112, and 116 connected to the intelligent street lamps 100 and 102 may perform Ethernet communication in the same manner as the direct connection to the hub 210.

The lighting controller 208 analyzes the Ethernet frame provided from the hub 210 and controls the LED lamp group 200 to adjust the color, blinking, and the like of the lighting.

The hub 210 connects the optical demodulator 204, the optical modulator 206, the lighting controller 208, the sensor group 212, the sound and image controller 214, and the emergency button controller 216, one of them By providing the Ethernet frames provided from all the other devices, all connected devices are included in one collision domain. The hub 210 may be configured as a bridge or a switch that can manage the division of the collision domain.

The sensor group 212 is composed of various sensors such as a zigbee sensor, and the collected data is transmitted to the control device 104 through the hub 210 in a visible light communication method.

When the sound and image controller 214 is provided with the encoded sound and image data from the hub 210, the sound and image controller 214 decodes the sound and image data to provide the speaker 222 to be reproduced, and the image data is displayed on the display 224. It is provided to be displayed on, and the image provided from the camera 220 is encoded, and transmitted to the control device 104 via the hub 210 in a visible light communication method.

When the emergency button 218 is pressed, the emergency button control unit 216 provides an emergency situation message to the lighting control unit 208, the sound and image control unit 214 through the hub 210. The lighting control unit 208 receives the emergency message and controls the LED lamp group 200 to propagate the emergency situation through color change, blink operation, and the like. The audio and video control unit 214 receives the emergency message, plays a sound indicating the emergency situation through the speaker 222, and displays a message indicating the emergency situation through the display unit 224.

The emergency button control unit 216 preferably transmits an emergency message to the lighting control unit 208, the sound and image control unit 214 of the intelligent street lamp located behind the intelligent street lamp.

An operation of the visible light communication network according to the present invention will be described.

Hereinafter, for convenience of description, the intelligent street lights 100 and 102 are referred to as the intelligent street lights 1 100 and the intelligent street lights 2 102, and the visible light communication terminals 108, 110, 112, and 116 are visible light communication terminals 1 108, The visible light communication terminal 2 (110), visible light communication terminal 3 (112), visible light communication terminal 4 (116).

First, the operation of transmitting the information collected by the sensor group 212 of the intelligent street light 1 (100) to the control device 104 will be described.

The sensor group 212 of the intelligent street light 1 (100) generates an Ethernet frame including the data collected by the sensors. The Ethernet frame includes a header and a payload, the header includes a MAC address of the optical modulator 206, and the payload includes data collected by sensors. It is preferable.

The sensor group 212 of the intelligent street light 1 (100) provides the Ethernet frame to the hub 210 of the intelligent street light 1 (100). The hub 210 of the intelligent street light 1 (100) provides the Ethernet frame to all connected equipment. Although there is no device having a MAC address that matches the destination MAC address included in the Ethernet frame, as described above, even if the destination MAC address included in the Ethernet frame does not match its own MAC address, The modulator 206 controls the LED lamp group 200 so that the provided Ethernet frame can be emitted through the LED lamp group 200.

The light receiving unit 202 of the intelligent street light 2 (102) recognizes the optical signal and converts it into an electrical signal and provides it to the optical demodulation unit (204). The optical demodulation unit 204 of the intelligent street light 2 102 demodulates the optical signal converted into an electrical signal provided by the light receiving unit 202 of the intelligent street light 2 102 to an Ethernet frame, thereby regenerating the hub of the intelligent street light 2 102. Provided at 210. The hub 210 of the intelligent street light 2 102 provides the Ethernet frame to all the connected equipment, and the optical modulator 206 of the intelligent street light 2 102 emits the provided Ethernet frame through the LED lamp group 200. LED lamp group 200 to be controlled.

The control device 104 receives the optical signal emitted by the LED lamp group 200 of the intelligent street light 2 (102), demodulates into an Ethernet frame, collected by the sensors of the intelligent street light 1 (100) included therein Process the data.

The operation of transmitting the information collected by the sensor group 212 of the intelligent street light 1 (100) to the control device 104 is not only the sensor group 212, but also the control device 104 The same communication path is also used for transmission to the network.

Next, the control device 104 looks at the operation of transmitting a signal for controlling the operation of the intelligent street light 1 (100) to the intelligent street light (1 100).

The operation of controlling the intelligent street light 1 (100) by the control device 104 is to reverse the operation of transmitting the information collected by the sensor group 212 of the intelligent street light 1 (100) described above to the control device 104. do.

For example, when the lighting color of the intelligent street light 1 (100) is to be changed, the control device 104 uses the MAC address of the lighting control unit 208 of the intelligent street light 1 (100) as a destination address, and a predefined format. Generates an Ethernet frame including lighting control data of the light source, converts it into an optical signal, and transmits the optical signal. The optical signal is received by the light receiving unit 202 of the intelligent street light 1 (100) via the intelligent street light 2 (102) and liberated. The light demodulator 204 is demodulated to an Ethernet frame, and is finally provided to the lighting controller 208 via the hub 210. The lighting controller 208 analyzes the lighting control data included in the Ethernet frame and controls the LED lamp group 200 so that the color of the lighting is changed.

Next, the operation to propagate the emergency situation backward, such as traffic situation, unauthorized crossing or accident occurrence in the front will be described.

When a walking signal occurs in the crosswalk, the crosswalk embedded LED lamp 118 embedded in the ground is turned on. At this time, the color of the lighting is preferably red, which means the stop. The crosswalk embedding LED lamp 118 also transmits pedestrian-generated Ethernet frames simultaneously with lighting.

When an emergency situation 120 such as a traffic accident or unauthorized crossing occurs and the camera 220 of the intelligent street light 2 102 located closest to the vehicle detects it, it provides a detection signal to the sound and image control unit 214 to provide an emergency situation. Send outgoing Ethernet frames. In addition, when a nearby person presses the emergency button 218 of the intelligent street light 2 (102), the emergency button control unit 216 of the intelligent street light 2 (102) transmits the emergency occurrence Ethernet frames.

The emergency occurrence Ethernet frame may be transmitted to the intelligent street light (100, 102) that the control unit 104 to notify the occurrence of the emergency situation.

The walk signal generating Ethernet frame and the emergency generating Ethernet frame may be classified into an lighting effect Ethernet frame, an audio and video effect Ethernet frame, and a visible light communication terminal notification Ethernet frame. Whether to notify the occurrence of a pedestrian signal or an emergency situation can be determined at the time of installation of the system, but for convenience of explanation, it will be described assuming that the two nearest intelligent street lights (100, 102) behind the crosswalk.

The lighting effect Ethernet frame is a destination address of the MAC address of the lighting control unit 208 of the intelligent street light (100, 102), the sound and image effects Ethernet frame is a sound and image control unit of the intelligent street light (100, 102) ( The MAC address of 214 is the destination address, and the visible light communication terminal notification Ethernet frame is the destination address of the MAC address of the optical modulator 206 of the intelligent street lamps 100 and 102.

The light-receiving unit 202 of the intelligent street light 2 102 close to the pedestrian crossing receives the pedestrian signal generating Ethernet frame and passes through the optical demodulation unit 204 of the intelligent street light 2 102 to the hub 210 of the intelligent street light 2 102. ) Thereafter, the gait signal generation Ethernet frame having the destination address of each device of the intelligent street light 1 (100) passes through the light modulator 206 of the intelligent street light 2 (102) and the LED lamp group 200 of the intelligent street light 2 (102). Retransmitted to the intelligent street light 1 (100), and the gait signal generation Ethernet frame, the destination address of each device of the intelligent street light 2 (102) is processed by each device of the intelligent street light 2 (102).

Specifically, the process of processing a walk signal generation or an emergency occurrence Ethernet frame, the lighting effect Ethernet frame, the lighting control unit 208 receives and controls the LED lamp group 200 to control the blinking of the light, the color of the lighting, etc. In this case, in the case of the audio and video effects Ethernet frame, the sound and video control unit 214 receives and reproduces the warning sound included in the sound and video effects Ethernet frame through the speaker 222, and the sound and video effects. Effect The warning image included in the Ethernet frame is displayed on the display unit 224, and the visible light communication terminal notification In the case of the Ethernet frame, the optical modulator 206 is retransmitted through the LED lamp group 200, visible light communication terminal 108, 110, 112, and 116 receive this to display a warning message or to play a warning sound.

When the pedestrian crosswalk LED lamp 118 is released, when the pedestrian signal of the pedestrian crossing is released, the pedestrian signal release Ethernet frame is transmitted again so that the intelligent street lamps 100 and 102 stop the operation of notifying the pedestrian signal generation ahead.

The crosswalk buried LED lamp 118 is preferable to prevent the risk of accidents through the blinking, color change, etc. over time after the walking signal generation.

1 is a view showing the configuration of a visible light communication network system including an intelligent street light according to the present invention.

2 is a view showing a detailed configuration of an intelligent street light capable of visible light communication according to the present invention.

Claims (11)

In the visible optical communication network system, An intelligent street light which transmits data collected by the provided observation equipment to the control device through visible light communication and receives a control signal of the control device through visible light communication to control the operation; And And a control device for receiving and storing data collected by the intelligent street light through the visible light communication from the intelligent street light, and transmitting a control signal through the visible light communication to the intelligent street light to control the intelligent street light. The method of claim 1, The visible light communication, Visible light communication network system, which is a visible light communication method in which the intelligent light lamps transmitting and receiving data and other intelligent light lamps between the control device relay the optical signal. The method of claim 2, The visible light communication, The TCP / IP stack is used as the communication protocol set, and Ethernet is used as the protocol corresponding to the data link layer. A visible light communication network system in which visible light communication is performed by modulating an optical signal and transmitting the signal through visible light communication, and receiving the optical signal and demodulating it into an Ethernet frame. The method of claim 1, The intelligent street light, Re-transmitting the optical signal received to the adjacent intelligent street light or visible light communication terminal, and acts like an Ethernet hub (Hub), providing a near-field and long-range wireless sharing service to the visible light communication terminal. The method of claim 1, The intelligent street light, Visible light communication network system for notifying traffic in front of the traffic light when the front traffic situation guidance signal is received through visible light communication, LED lamp flashing, light color change, warning sound reproduction and warning message display. The method of claim 5, The intelligent street light, When the forward traffic situation guide signal is received through the visible light communication, the visible light communication network system to retransmit the received signal to the visible light communication terminal to inform the traffic situation in front of the warning sound reproduction and warning message display. The method of claim 6, The intelligent street light, When an emergency situation such as unauthorized crossing or traffic accident is recognized by the equipped camera, the LED lamp blinks, the light color changes, warning sound reproduction and warning message display indicate the emergency situation, and the intelligent street lights in the rear inform the emergency situation. Visible light communication network system that transmits forward traffic situation guidance signal of contents. The method of claim 6, The intelligent street light, When the emergency button is pressed, the LED lamp flashes, the color changes, the warning sound is reproduced, and the warning message is displayed to inform the emergency situation, and the front traffic situation guidance signal that informs the emergency situation occurrence to the intelligent street lights at the rear. Visible light communication network system. The method of claim 5, The visible light communication network system, When a pedestrian signal is generated, the front traffic situation guide signal that informs the neighboring intelligent street lamps of the pedestrian signal generation is transmitted through visible light communication to inform the occurrence of the pedestrian signal at the rear, and when the pedestrian signal is generated, it lights in red. Visible light communication network system further comprising a crosswalk embedded LED lamp. The method of claim 9, The crosswalk buried LED lamp, Visible light communication network system that prevents accident risk through blinking and color change over time after walking signal generation. In the intelligent street light that can communicate visible light, An optical modulator for modulating a communication frame received from a hub into an optical signal and then controlling and transmitting an LED lamp group; LED lamp group for emitting an optical signal by the control of the optical modulator; A light receiving unit which recognizes an optical signal and converts the electrical signal into an electrical signal and provides the optical demodulation unit; An optical demodulator configured to receive an electrical signal from the photoreceiver and demodulate it into a communication frame and provide it to a hub; And a hub that connects the optical modulator, the optical demodulator, and other Ethernet communication equipment, and transmits a communication frame transmitted by one of the devices to all other connected devices.

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