KR20180042741A - Apparatus and method for performing visible light communication by using wi-fi based uplink feedback information - Google Patents

Abstract

The present invention relates to an apparatus for performing visible light communications by using Wi-Fi based feedback information and a method thereof. According to an embodiment of the present invention, a method for controlling visible light communications (VLCs) comprises the following steps: determining locations of a plurality of light emitting diodes (LEDs) based on the power of signals received from the light emitting diodes; receiving feedback information through Wi-Fi from at least one user terminal; determining an LED, located in the shortest distance from the user terminal, among the LEDs based on the feedback information and locations of the LEDs; and transmitting information to the user terminal by using the determined LED.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for performing visible light communication using Wi-Fi based uplink feedback information,

The present invention relates to an apparatus and method for performing visible light communication using uplink feedback information based on Wi-Fi.

A visible light communication (VLC) system is a fusion technology that simultaneously provides illumination and data transmission through a light emitting diode (LED).

The wavelength of light is different from optical communication technology through existing wired optical fiber by transmitting and exchanging information by using light including visible light area and near infrared light area visible to human eyes.

In recent years, light such as incandescent lamps and fluorescent lamps have been replaced with light emitting diode lights, and the next generation communication system in which information is transmitted to each object using such an infrastructure.

Based on the characteristics of such visible light communication, the development of visible light communication commercialization technology is being actively carried out in a place where a large-scale light emitting diode infrastructure such as a home, an office, an exhibition hall, a large mart, etc. is constructed.

Particularly, in the indoor environment such as the exhibition hall and the large-sized shopping mall, researches are actively carried out on the technology of transmitting information of objects, exhibits, or location information for a location based service (LBS) to users by using visible light communication have.

Visible light communication is attracting attention as a next generation short range communication technology that can solve the radio frequency exhaustion problem due to the increase of data traffic.

Especially, based on visible light communication, various fields such as product information, exhibition information, and location information for location based services are being diversified.

However, since there are a relatively large number of users in the indoor environment as compared with the general communication environment, it is necessary to develop an adaptive user multiple access technique considering the channel environment.

In addition, since a plurality of light emitting diodes are installed in the indoor environment as described above, the communication service must be provided by being connected to the light emitting diode nearest to the user.

According to the related art, an uplink feedback system using infrared (IR) communication has been proposed.

However, infrared communication can be used in a channel in which a location based service is secured, and communication performance deteriorates in a non-location based service (NLOS) environment.

Therefore, there is a need to propose an uplink feedback method and system to overcome the above problems.

Korean Patent No. 10-1635734, "Method and Apparatus for Visible Light Communication Service" Korean Patent Laid-Open No. 10-2015-0004311, "How to register a lighting device, a lighting device system, and a lighting device" Korean Patent Publication No. 10-2013-0116417, " Lighting Control System Using Visible Light Communication and Method Thereof "

Han, Doo - Hee, Joo - cheol, Kim, Kyun - tak, Lee, Gyu - san; "Channel Assignment Scheme According to User Location via IR in VLC System"; The Journal of the Korea Information and Communications Society Vol. 19, No. 2: 443 ~ 449 Feb. 2015

The present invention provides an apparatus and method for performing visible light communication using uplink feedback information based on Wi-Fi.

The present invention provides an apparatus and method for transmitting / receiving feedback information through at least one user terminal via Wi-Fi.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for determining the position of a plurality of light emitting diodes based on a power of a signal received from a plurality of light emitting diodes.

The present invention provides an apparatus and method for determining a light emitting diode closest to a position of at least one user terminal by comparing a position of at least one user terminal with a position of a plurality of light emitting diodes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for connecting a visible light communication link between a light emitting diode closest to a location of at least one user terminal and a user terminal.

The present invention provides an apparatus and method for determining the wavelengths of light emitting diodes based on respective distances from a light emitting diode to a plurality of user terminals, when a plurality of user terminals exist in a service zone of the light emitting diode.

The present invention provides an apparatus and method for transmitting information using a light emitting diode closest to a user terminal.

The present invention seeks to provide an apparatus and method for receiving information from a light emitting diode closest to a user terminal.

 According to an aspect of the present invention, there is provided a method of operating a visible light communication control device, the method comprising: determining a position of the plurality of light emitting diodes based on a power of a signal received from a plurality of light emitting diodes (LEDs); Receiving feedback information via Wi-Fi from at least one user terminal; Determining a light emitting diode located closest to the at least one user terminal among the plurality of light emitting diodes based on the feedback information and the position of the plurality of light emitting diodes; And transmitting information to the at least one user terminal using the determined light emitting diode.

A method of operating a user terminal according to an exemplary embodiment of the present invention includes: transmitting feedback information to a visible light communication control device through a WiFi; And receiving information from the light emitting diodes determined to be located closest to the user terminal among the plurality of light emitting diodes based on the feedback information and the positions of the plurality of light emitting diodes.

A control device for visible light communication according to an embodiment of the present invention includes a plurality of light emitting diodes for performing visible light communication; A communication unit for performing WiFi communication; And a controller for controlling the plurality of light emitting diodes and the communication unit, wherein the controller determines a position of the plurality of light emitting diodes based on a power of a signal received from the plurality of light emitting diodes, Receiving feedback information from one or more user terminals via Wi-Fi, and outputting feedback information and a light emitting diode located closest to the at least one user terminal among the plurality of light emitting diodes based on the feedback information and the position of the plurality of light emitting diodes And transmits the information to the at least one user terminal using the determined light emitting diode.

A user terminal according to an exemplary embodiment of the present invention transmits feedback information through a Wi-Fi to a visible light communication control device and transmits feedback information to the visible light communication control device from the user terminal of the plurality of light emitting diodes And a communication unit for receiving information from the light emitting diodes determined to be located in the light emitting diodes.

The visible light communication control apparatus according to an embodiment of the present invention does not require the construction of a separate communication facility by controlling visible light communication using a WiFi in which a large-scale infrastructure is constructed, have.

In addition, the visible light communication control apparatus according to an embodiment of the present invention transmits information using a light emitting diode to a user terminal, thereby reducing the frequency resource exhaustion problem of existing wireless communication.

In addition, the visible light communication control apparatus according to an embodiment of the present invention can perform both illumination and communication by using a light emitting diode, so that it is not required to construct an additional infrastructure.

In addition, the visible light communication control apparatus according to an embodiment of the present invention can provide information such as goods, exhibits, and the like to a user by using visible light communication in an environment in which a large-scale light emitting diode lighting infrastructure such as a large-sized mart, an exhibition hall, .

In addition, the user terminal according to an embodiment of the present invention has an effect of saving radio resources by transmitting feedback information through a pre-established Wi-Fi infrastructure.

1 shows a block diagram of a visible light communication control apparatus according to an embodiment of the present invention.
2 illustrates a block diagram of a user terminal in accordance with an embodiment of the present invention.
FIG. 3 illustrates a visible light communication system environment according to an embodiment of the present invention.
FIG. 4 shows a block diagram for wavelength division multiple access according to an embodiment of the present invention.
FIG. 5 illustrates operation procedures of a visible light communication control apparatus according to an exemplary embodiment of the present invention.
6 illustrates an operation procedure of a user terminal according to an embodiment of the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings.

It is to be understood that the embodiments and terminologies used herein are not intended to limit the invention to the particular embodiments described, but to include various modifications, equivalents, and / or alternatives of the embodiments.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The following terms are defined in consideration of functions in various embodiments and may vary depending on the intention of a user, an operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

In connection with the description of the drawings, like reference numerals may be used for similar components.

The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this document, the expressions "A or B" or "at least one of A and / or B" and the like may include all possible combinations of the items listed together.

Expressions such as " first, "" second," " first, "or" second, " But is not limited to those components.

When it is mentioned that some (e.g., first) component is "(functionally or communicatively) connected" or "connected" to another (second) component, May be connected directly to the component, or may be connected through another component (e.g., a third component).

As used herein, the term "configured to" is intended to encompass all types of information, including, but not limited to, " , "" Made to "," can do ", or" designed to ".

In some situations, the expression "a device configured to" may mean that the device can "do " with other devices or components.

For example, a processor configured (or configured) to perform the phrases "A, B, and C" may be implemented by executing one or more software programs stored in a memory device or a dedicated processor (e.g., an embedded processor) , And a general purpose processor (e.g., a CPU or an application processor) capable of performing the corresponding operations.

Also, the term 'or' implies an inclusive or 'inclusive' rather than an exclusive or 'exclusive'.

That is, unless expressly stated otherwise or clear from the context, the expression 'x uses a or b' means any of the natural inclusive permutations.

1 shows a block diagram of a visible light communication control apparatus according to an embodiment of the present invention.

More specifically, FIG. 1 illustrates the components of the visible light communication control apparatus 100.

Hereinafter, terms such as "part," "group," and the like are used to denote units for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

1, the visible light communication control apparatus 100 includes a communication unit 110, a storage unit 120, a light emitting diode unit 130, and a control unit 140.

The communication unit 110 performs functions for transmitting and receiving signals through an optical communication channel.

The communication unit 110 performs a function of converting a baseband signal and a bit string according to a physical layer standard of the system.

For example, the communication unit 110 may generate complex symbols by encoding and modulating transmission bit streams during data transmission.

In addition, the communication unit 110 can recover the received bit stream by demodulating and decoding the baseband signal upon receiving the data.

For example, at the time of data transmission, the communication unit 110 can generate demodulation symbols by encoding and modulating a transmission bit stream.

Also, the communication unit 110 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and downconverts the RF band signal received through the antenna to a baseband signal.

For example, the communication unit 110 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC)

In addition, the communication unit 110 may include different communication modules for processing signals of different frequency bands.

For example, different communication standards may include Bluetooth low energy (BLE), Wireless Fidelity (Wi-Fi), WiFig Gigabyte (WiGig), cellular networks (eg Long Term Evolution) have.

Also, different frequency bands may include super high frequency (SHF) (e.g., 2.5 GHz, 5 GHz) and millimeter wave (e.g., 60 GHz) bands.

The communication unit 110 according to an embodiment of the present invention can receive feedback information from a user terminal through a Wi-Fi.

For example, the feedback information may include the location of the user terminal and the requested data.

For example, the communication unit 110 may receive feedback information from the user terminal through the uplink channel of the Wi-Fi.

The storage unit 120 stores data such as a basic program, an application program, and setting information for operation of the visible light communication control device 100.

In particular, storage 120 may store at least one set of instructions (e.g., applications) for managing files in accordance with various embodiments.

The storage unit 120 may provide the stored data at the request of the controller 140.

The storage unit 120 may include volatile and / or non-volatile memory.

The storage unit 120 may store instructions or data related to at least one other component of the visible light communication control device 100. [

The storage unit 120 is included in the visible light communication control device 100 and may be referred to as an 'internal storage' or an 'internal storage'.

The storage unit 120 according to an embodiment of the present invention may store feedback information including a location of a user terminal and request data.

The storage unit 120 according to an exemplary embodiment of the present invention may store information on the locations of a plurality of light emitting diodes (LEDs).

The storage unit 120 according to an embodiment of the present invention may store information related to the signal power of a plurality of light emitting diodes.

The light emitting diode unit 130 may include a plurality of light emitting diodes.

The light emitting diode unit 130 may transmit a signal to the control unit 140 through the Ethernet / power line.

For example, the plurality of light emitting diodes included in the light emitting diode unit 130 may have different signal power levels depending on the positions of the light emitting diodes.

For example, the light emitting diode unit 130 may be an aggregate of light emitting diodes connected wirelessly with the visible light communication control apparatus 100 and remotely controlled by wireless.

For example, a light emitting diode may be referred to as an illumination lamp or a light emitting device.

For example, a plurality of light emitting diodes may be deployed in a wide area such as an exhibition hall or a large mart.

For example, a light emitting diode among a plurality of light emitting diodes, which is determined to be located closest to a user terminal, can connect a visible light communication link to a user terminal.

For example, the light emitting diode may emit light into the service zone and transmit information to the user terminal located in the service zone.

For example, the service zone represents an area where the light emitted by the light emitting diode can reach.

The control unit 140 may control operations performed by the communication unit 110, the storage unit 120, and the LED unit 130.

For example, the control unit 140 may perform an operation or data processing related to control and / or communication of at least one other component of the visible light communication control apparatus 100. [

For example, the control unit 140 may control a plurality of hardware or software components connected to the control unit 140 by driving an operating system or an application program, and may perform various data processing and calculations.

For example, the controller 140 may be implemented as a system on chip (SOC). The control unit 140 may load and process the command or data received from at least one of the other components (e.g., non-volatile memory) into the volatile memory and store the resultant data in the nonvolatile memory.

The controller 140 may determine the positions of the plurality of light emitting diodes based on the power of signals received from the plurality of light emitting diodes.

The controller 140 according to an embodiment of the present invention can receive feedback information from at least one user terminal via Wi-Fi.

The controller 140 may determine the light emitting diodes located closest to the at least one user terminal among the plurality of light emitting diodes based on the feedback information and the positions of the plurality of light emitting diodes.

The control unit 140 according to an exemplary embodiment of the present invention compares position information of at least one user terminal included in the feedback information with positions of a plurality of light emitting diodes, Can be determined.

The controller 140 according to an embodiment of the present invention can transmit information to at least one user terminal using the determined light emitting diodes.

The control unit 140 according to an embodiment of the present invention may transmit a control signal to transmit information to the user terminal using the determined light emitting diode.

The controller 140 controls the wavelengths of the light emitting diodes determined based on the respective distances from the determined light emitting diodes to the plurality of user terminals when there are a plurality of user terminals in the service zone of the determined light emitting diode And transmit information to a plurality of user terminals based on the determined wavelengths.

The controller 140 may connect a visible light communication link between the determined light emitting diode and at least one or more user terminals according to an exemplary embodiment of the present invention.

May be associated with a blending ratio of R (red) channel, G (green) and B (blue) channels according to an embodiment of the present invention, and the mixing ratio of R channel, G channel, And may be related to the distance between the light emitting diodes.

For example, the distance between the user terminals and the light emitting diodes may be the communication distance between the user terminals and the light emitting diodes.

The feedback information according to an exemplary embodiment of the present invention may include at least one user terminal location and request data.

For example, the control unit 140 may control the visible light communication control device 100 to perform the procedure shown in FIG. 5, etc., hereinafter.

2 illustrates a block diagram of a user terminal in accordance with an embodiment of the present invention.

Specifically, FIG. 2 illustrates components of user terminal 200.

Hereinafter, terms such as "part," "group," and the like are used to denote units for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Referring to FIG. 2, the user terminal 200 includes a communication unit 210, a storage unit 220, an optical communication unit 230, and a control unit 240.

For example, the user terminal 200 may be a portable terminal, a tablet PC, a smart watch, and the like, and may include a display and may include a display.

The communication unit 210 performs a function of converting a baseband signal and a bit string according to a physical layer standard of the system.

For example, the communication unit 210 generates complex symbols by encoding and modulating transmission bit streams during data transmission.

In addition, the communication unit 210 demodulates and decodes the baseband signal upon receiving the data, and restores the received bit stream.

For example, at the time of data transmission, the communication unit 210 generates complex symbols by encoding and modulating transmission bit streams.

Also, upon receiving the data, the communication unit 210 demodulates and decodes the baseband signal to recover the received bit stream.

In addition, the communication unit 210 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and downconverts the RF band signal received through the antenna to a baseband signal.

For example, the communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, the communication unit 210 may include different communication modules for processing signals of different frequency bands.

For example, different communication standards may include Bluetooth low energy, Wi-Fi, WiGig, cellular networks (e.g., LTE, etc.).

Also, different frequency bands may include extreme short wave (e.g., 2.5 GHz, 5 GHz) band, mm wave (e.g., 60 GHz) band.

The communication unit 210 according to an embodiment of the present invention can transmit feedback information including the location of the user terminal and the request data through the Wi-Fi.

The communication unit 210 according to an embodiment of the present invention can transmit feedback information to the visible light communication control device via Wi-Fi.

The storage unit 220 stores data such as a basic program, an application program, and setting information for the operation of the user terminal 200.

In particular, storage 220 may store at least one set of instructions (e.g., applications) for managing files in accordance with various embodiments. The storage unit 220 provides the stored data at the request of the control unit 240.

The storage unit 220 may include volatile and / or non-volatile memory.

The storage unit 220 may store instructions or data related to at least one other component of the user terminal 200.

The storage unit 220 stores data such as a basic program, an application program, and setting information for the operation of the user terminal 200.

In particular, storage 220 may store at least one set of instructions (e.g., applications) for managing files in accordance with various embodiments.

At least one instruction set stored in the storage unit 220 may be executed by the control unit 260.

The storage unit 220 provides the stored data at the request of the control unit 240.

The storage unit 220 is included in the user terminal 200 and may be referred to as an 'internal storage' or an 'internal storage'.

The storage unit 220 according to an exemplary embodiment of the present invention may store information on the location of the user terminal.

The storage unit 220 according to an embodiment of the present invention may store information received from the light emitting diodes.

The optical communication unit 230 receives light from the light emitting diode using the photodiode through the optical communication channel, and converts the light into an electrical signal.

The optical communication unit 230 may convert the light into an electrical signal, and then transmit the converted electrical signal to the control unit 240.

For example, light emitted from a light emitting diode may include information.

The optical communication unit 230 according to an exemplary embodiment of the present invention can process information transmitted and received via an optical communication channel.

The optical communication unit 230 according to an embodiment of the present invention receives information from the light emitting diodes determined to be located closest to the user terminal among the plurality of light emitting diodes based on the feedback information and the positions of the plurality of light emitting diodes .

The optical communication unit 230 according to an exemplary embodiment of the present invention may determine the wavelengths of the light emitting diodes determined based on the respective distances from the determined light emitting diodes to the plurality of user terminals when there are a plurality of user terminals in the service zone of the determined light emitting diode The light emitting diodes may receive information from the determined light emitting diodes.

The control unit 240 can control operations of the communication unit 210, the storage unit 220, and the optical communication unit 230. [

A processor, a central processing unit, an application processor, or a communications processor.

For example, the control unit 240 may perform operations and data processing related to control and / or communication of at least one other component of the user terminal 200. For example,

For example, the control unit 240 may control a plurality of hardware or software components connected to the control unit 240 by driving an operating system or an application program, and may perform various data processing and calculations.

For example, the control unit 240 may be implemented as a system on chip (SOC). The control unit 240 may load and process the command or data received from at least one of the other components (e.g., non-volatile memory) into the volatile memory and store the resulting data in the non-volatile memory.

The control unit 240 controls the overall operation of the user terminal 200. The control unit 240 may control overall operations of the communication unit 210, the storage unit 220, and the optical communication unit 230.

For example, the control unit 240 transmits feedback information through the communication unit 210. In addition, the control unit 240 writes data in the storage unit 220 and reads the data. The control unit 240 receives information from the plurality of light emitting diodes controlled by the visible light communication control device through the optical communication unit 230. [

To this end, the control unit 240 may include at least one processor or a microprocessor, or may be part of a processor.

For example, the control unit 240 may control the communication unit 210 to transmit feedback information to the visible light communication control device via Wi-Fi.

For example, the control unit 240 controls the optical communication unit 230 to control the optical communication unit 230 based on the feedback information and the positions of the plurality of light emitting diodes, Information can be received.

For example, the control unit 240 can control the user terminal 200 to perform the procedure shown in FIG. 6, and the like.

FIG. 3 illustrates a visible light communication system environment according to an embodiment of the present invention.

3 shows a state in which the visible light communication control apparatus 100 receives the position of the first to third light emitting diodes 131, 132 and 133 and the position of the WiFi from the first to fourth user terminals 201, 202, 203 and 204 The position information included in the received feedback information is compared with each other, and the information is transmitted through the light emitting diode closest to the user terminal.

3, the visible light communication control device 100 is connected to the first to third light emitting diodes 131, 132, and 133 through the Ethernet / power line 310, and the first to fourth user terminals 201, 202, 203, and 204 via a WiFi.

Also, the first and second user terminals are positioned closest to the first light emitting diode 131 and are simultaneously located in the service area of the first light emitting diode 131.

Also, the third user terminal 203 is located closest to the second light emitting diode 132 and is located in the service zone of the second light emitting diode 132.

In addition, the fourth user terminal 204 is located closest to the third light emitting diode 133 and is located in the service zone of the third light emitting diode 133.

The visible light communication control apparatus 100 according to an exemplary embodiment of the present invention can receive signals from the first to third LEDs 131, 132, and 133 through the Ethernet / power line 310.

The visible light communication control apparatus 100 according to an embodiment of the present invention analyzes power of signals received from the first to third LEDs 131, 132 and 133 through the Ethernet / power line 310, The positions of the third light emitting diodes 131, 132, and 133 can be determined.

For example, in the visible light communication control apparatus 100, as the magnitude of the power of the signal received from the first to third light emitting diodes 131, 132, and 133 increases, It can be determined that the distance to one of the diodes 131, 132, and 133 is close.

The visible light communication control apparatus 100 according to an embodiment of the present invention can receive feedback information from the first to fourth user terminals 201, 202, 203, and 204 through Wi-Fi.

The visible light communication control apparatus 100 according to an exemplary embodiment of the present invention includes first to fourth user terminals 201, 202, and 203 included in the feedback information received from the first to fourth user terminals 201, 202, 203, 202, 203, and 204 can be confirmed.

The visible light communication control apparatus 100 according to an exemplary embodiment of the present invention may control the positions of the first to third light emitting diodes 131, 132, and 133 and the positions of the first to fourth user terminals 201, 202, 203, You can compare locations.

The visible light communication control apparatus 100 according to an exemplary embodiment of the present invention may control the positions of the first to third light emitting diodes 131, 132, and 133 and the positions of the first to fourth user terminals 201, 202, 203, Based on the result of the comparison of the positions, it is possible to determine objects located at the root of each other between the light emitting diode and the user terminal.

The visible light communication control apparatus 100 according to an exemplary embodiment of the present invention may control the positions of the first to third light emitting diodes 131, 132, and 133 and the positions of the first to fourth user terminals 201, 202, 203, It can be determined that the first light emitting diode 131 and the first and second user terminals 201 and 202 are located closest to each other based on the comparison result of the position.

Further, the visible light communication control apparatus 100 can determine that the second light emitting diode 132 and the third user terminal 203 are positioned closest to each other based on the result of the comparison of the positions.

Further, the visible light communication control apparatus 100 can determine that the third light emitting diode 133 and the fourth user terminal 204 are located closest to each other based on the result of the comparison of the positions.

The visible light communication control apparatus 100 according to an embodiment of the present invention determines that the first light emitting diode 131 and the first and second user terminals 201 and 202 are located closest to each other, A visible light communication link may be connected between the light emitting diode 131 and the first and second user terminals 201 and 202.

In addition, the visible light communication control apparatus 100 may connect a visible light communication link between the second light emitting diode 132 and the third user terminal 203.

In addition, the visible light communication control device 100 may connect a visible light communication link between the third light emitting diode 133 and the fourth user terminal 204. [

The first to third light emitting diodes 131, 132, 133 according to the embodiment of the present invention can emit light in each service zone and transmit information to an optical communication device located in the service zone.

The first to third light emitting diodes 131, 132, and 133 according to an embodiment of the present invention can transmit information by emitting light to a corresponding user terminal to which a visible light communication link is connected through a connected visible light communication link.

For example, the first to third light emitting diodes 131, 132, and 133 may emit light including information for continuously emitting light.

For example, when the first to third light emitting diodes 131, 132, and 133 receive the control signal to transmit information from the visible light communication control device 100 while performing the function of illuminating the surrounding environment, And can transmit information based on the received control signal.

For example, the first user terminal 201 transmits feedback information including the position of the first user terminal 201 and the request data to the visible light communication control device 100, and transmits the feedback information through the visible light communication control device 100 The first light emitting diode 131 may be connected to a visible light communication link and the first light emitting diode 131 may receive information related to the request data.

The second to fourth user terminals 202, 203 and 204 also transmit the feedback information to the visible light communication control apparatus 100 via the WiFi so that the first to third light emitting diodes 131, 132 and 133, And can receive information related to the request data from the first to third light emitting diodes 131, 132,

According to an embodiment of the present invention, when the number of user terminals connected to a specific light emitting diode or located in a service zone of a specific light emitting diode is large, the visible light communication control apparatus 100 may control a wavelength of light emitted by the light emitting diode The light emitting diodes can be controlled so as to provide information by assigning them to terminals.

The case where there are a plurality of user terminals connected to a specific light emitting diode or located in a service zone of a specific light emitting diode will be described in more detail with reference to FIG.

FIG. 4 shows a block diagram for wavelength division multiple access according to an embodiment of the present invention.

Specifically, FIG. 4 compares the positions of a plurality of light emitting diodes with the positions of a plurality of user terminals, and when the number of user terminals determined to be located closest to a specific light emitting diode is large, ≪ / RTI > illustrate the blocks that handle the operation of dividing the wavelength of the light that is emitted by the light source and delivering the information.

4, the visible light communication control device includes an RGB control section 141, a pulse modulation section 142, first to third light emitting diodes 131, 132 and 133, first to third light emitting diodes 131 and 132 And 133 may correspond to the first to third optical channels 401, 402, and 403, respectively.

The user terminal may be configured as first to fourth user terminals. Each of the first to fourth user terminals may include first to fourth photodiodes 231, 232, 233 and 234 and first to fourth pulse demodulators 241, 242, 243 and 244.

The visible light communication control apparatus according to an exemplary embodiment of the present invention can control the R channel, the G channel, and the B channel through the RGB controller 141.

The visible light communication control apparatus according to an embodiment of the present invention can modulate a pulse of a signal to be transmitted through the pulse modulator 142. [

The first to third light emitting diodes 131, 132 and 133 according to the embodiment of the present invention may emit light to transmit information.

The first to third optical channels 401, 402, and 403 according to an embodiment of the present invention can transmit light transmitted from the first to third LEDs 131, 132, and 133.

The visible light communication control device compares the positions of the first to third light emitting diodes 131, 132, and 133 with the positions of the first to fourth user terminals and compares the positions of the first to third user terminals located closest to the first light emitting diode 131 And a second user terminal.

The visible light communication control apparatus according to an exemplary embodiment of the present invention includes a first light emitting diode 131 and a plurality of first light emitting diodes 131, The wavelengths may be determined based on the respective distances between the user terminals, and information may be transmitted based on the determined wavelengths.

For example, the visible light communication control device can compare the positions of the first to third LEDs 131, 132, and 133 with the positions of the first to fourth user terminals, respectively.

For example, the visible light communication controller can determine the first light emitting diode 131 as the light emitting diode located closest to the first and second user terminals.

The visible light communication controller can recognize that the first and second user terminals are present in the service zone of the first light emitting diode 131. [

For example, when the request data included in the feedback information transmitted by the first and second user terminals are different, the visible light communication control device divides the wavelength of the first light emitting diode 131, 1 and the second user terminal, respectively.

When the first and second user terminals, which connect the first light emitting diode 131 and the visible light communication link, request different data, the visible light communication control apparatus controls the first light emitting diode 131 and the first light emitting diode 131 through the RGB control unit 141, And the second user terminal according to the distance.

The visible light communication controller can allocate wavelengths corresponding to the G and B channels to the first user terminal through the RGB controller 141 and assign wavelengths corresponding to the R channels to the second user terminal.

For example, when a visible light communication control device transmits light by dividing a wavelength, the wavelength can be determined according to the size of data to be transmitted.

The visible light communication controller modulates information corresponding to data requested by the first user terminal and the second user terminal through the pulse modulator 142 and transmits the modulated information to the first and second user terminals through the first light emitting diode 131 And transmits optical signals corresponding to the G and B channels to the first user terminal through the first optical channel 401 and optical signals corresponding to the R channel to the second user terminal.

The first user terminal can receive optical signals corresponding to the G and B channels through the first photodiode 231. [

The second user terminal can receive the optical signal corresponding to the R channel through the second photodiode 232.

The first user terminal can modulate the optical signal received through the first photodiode 231 through the first pulse demodulation unit 241 and detect the data.

The second user terminal 202 can modulate the optical signal received through the second photodiode 232 through the second pulse demodulator 242 and detect the data.

According to an exemplary embodiment, channels may be allocated based on the channel performance of the R, G, and B channels and the distance to the user even within the coverage area of the light emitting diode.

For example, when the distance between the first light emitting diode 131 and the second user terminal 202 is shorter than the distance between the first light emitting diode 131 and the first user terminal 201 in FIGS. 3 and 4, An R channel having a small channel efficiency can be allocated to the second user terminal 202. [

In this case, the G and B channels are allocated to the first user terminal 201 in order to minimize the efficiency reduction of the channel allocated to the first user terminal 201, and data can be transmitted in parallel through the G and B channels.

For example, a visible light communication control apparatus can allocate a channel having a high channel efficiency to a user terminal having a long communication distance and assign a channel having a small channel efficiency to a user terminal having a communication distance close to the communication terminal.

For example, the visible light communication control apparatus can allocate a channel having a good channel efficiency to a user terminal having a long communication distance and assign a channel having a small channel efficiency to a user terminal having a short communication distance, thereby ensuring the fairness of the communication service .

For example, the mixing ratio of the R channel, the G channel, and the B channel may be related to the communication distance between the user terminal and the light emitting diode.

For example, the visible light communication control device allocates data of a user having a long communication distance to a wavelength band having a larger blending ratio (i.e., a larger power), and transmits the data to a user terminal A wavelength band having a small mixing ratio can be allocated.

For example, it may be related to the magnitude of the wavelength of each channel of the mixing ratio of the R channel, G channel and B channel.

For example, when the wavelength of the R channel is the largest, the wavelength of the B channel is the smallest, and the wavelength of the G channel is the middle among the R channel, the G channel and the B channel, the mixing ratio of the R channel is the smallest, The mixing ratio of the B channel is the smallest.

That is, the mixing ratio of the wavelengths of the R channel, the G channel, and the B channel to the R channel, the G channel, and the B channel may be inversely proportional to each other.

On the other hand, the channel performance may vary depending on the pulse modulation technique. For example, OOK modulation can be excellent in terms of channel performance among OOK (On-Off Keying) modulation and VPPM (Variable Pulse Position Modulation). However, since the OOK modulation may have a detrimental effect on the performance of the illumination, the two methods can be used in combination.

For example, in the case of an R channel having a relatively good channel performance, VPPM is used, and in a channel having a relatively poor channel status, OOK modulation having superior performance can be used.

The visible light communication system according to an exemplary embodiment of the present invention can allocate channels based on channel performance and distance from a user, and can use the modulation scheme flexibly to minimize the deterioration of channel performance.

The visible light communication control apparatus according to an embodiment of the present invention determines the light emitting diode located closest to the third user terminal to be the second light emitting diode 132 and the light emitting diode located in the service zone of the second light emitting diode 132 Since there is one user terminal, an optical signal corresponding to the R channel, the G channel, and the B channel is transmitted to the third user terminal through the second optical channel 402 through the RGB controller 141.

The third user terminal receives the optical signal corresponding to the R channel, the G channel and the B channel through the third photodiode 233 and modulates the optical signal through the third pulse demodulator 243 to detect the data .

Since the fourth user terminal is also present in the service zone of the third light emitting diode 133, the optical signal corresponding to the R channel, the G channel, and the B channel is transmitted through the third optical channel 403 through the RGB controller 141, Through the fourth photodiode 234 through the fourth pulse demodulation unit 244, and can detect the data by modulating it through the fourth pulse demodulation unit 244. [

FIG. 5 illustrates operation procedures of a visible light communication control apparatus according to an exemplary embodiment of the present invention.

Specifically, FIG. 5 illustrates a state in which the visible light communication control apparatus according to an exemplary embodiment of the present invention receives feedback information from at least one user terminal through Wi-Fi, compares feedback information with a position of a light emitting diode, And an operation procedure of providing information to the user terminal through the nearest positioned light emitting diode.

Referring to FIG. 5, in step 501, the visible light communication control device determines the positions of a plurality of light emitting diodes.

The visible light communication control apparatus receives signals from the plurality of light emitting diodes and determines the positions of the plurality of light emitting diodes based on the power of the received signals.

For example, the visible light communication control apparatus can determine that the light emitting diode is located at a short distance from the visible light communication control apparatus, as the intensity of power transmitted from the plurality of light emitting diodes through the power line increases.

For example, the visible light communication control apparatus can determine that the light emitting diode is located farther from the visible light communication control apparatus as the power transmitted from the plurality of light emitting diodes through the power line is smaller.

In step 503, the visible light communication control apparatus receives feedback information from the user terminal via the Wi-Fi connection.

The visible light communication control apparatus according to an exemplary embodiment of the present invention can receive feedback information from at least one user terminal through Wi-Fi.

For example, the feedback information may include at least one user terminal location and request data.

For example, the visible light communication control apparatus can confirm the position of the user terminal included in the feedback information received from the user terminal.

In step 505, the visible light communication controller determines a light emitting diode located closest to the user terminal.

A visible light communication control apparatus according to an exemplary embodiment of the present invention includes a plurality of light emitting diodes that are located closest to a user terminal among a plurality of light emitting diodes based on feedback information received from a user terminal and position of light emitting diodes determined based on signal power of light emitting diodes It is possible to determine the light emitting diodes.

For example, the visible light communication control apparatus compares the position of the user terminal, which is determined based on the feedback information, with the position of the light emitting diodes determined based on the signal power of the light emitting diodes, You can decide.

In step 507, the visible light communication controller transmits information to the user terminal using the determined light emitting diode.

The visible light communication control apparatus according to an embodiment of the present invention may provide information to at least one or more terminals located in a service zone of a light emitting diode using a light emitting diode determined to be located closest to the user terminal.

The visible light communication control apparatus according to an exemplary embodiment of the present invention may transmit a control signal for transmitting information to a user terminal located in a service zone of a light emitting diode with a light emitting diode determined to be located closest to the user terminal.

The light emitting diode determined to be located closest to the user terminal according to the embodiment of the present invention receives the control signal to transmit information from the visible light communication control apparatus to the user terminal and then transmits the information to the user terminal based on the control signal Lt; / RTI >

For example, the information provided to at least one terminal of the determined light emitting diode may be information of an object, an exhibit, or information requested by a user of the user terminal in an indoor environment such as an exhibition hall or a large-sized shopping mall.

For example, if there are a plurality of user terminals in the service zone of the determined light emitting diode, the wavelengths of the light emitting diodes determined based on respective distances from the determined light emitting diodes to the plurality of user terminals, respectively, can be determined.

For example, the visible light communication controller can provide information to the user terminal through a wavelength corresponding to each of a plurality of user terminals using the determined light emitting diode.

For example, the visible light communication control device can connect a visible light communication link between a user terminal and a light emitting diode determined to be located closest to the user terminal.

6 illustrates an operation procedure of a user terminal according to an embodiment of the present invention.

6 illustrates an operation procedure in which a user terminal according to an exemplary embodiment of the present invention transmits feedback information to a visible light communication control device via Wi-Fi and receives information from a light emitting diode determined based on feedback information .

Referring to FIG. 6, in step 601, the user terminal transmits feedback information via Wi-Fi.

A user terminal according to an embodiment of the present invention transmits feedback information through a Wi-Fi to a visible light communication control device.

The user terminal according to an embodiment of the present invention transmits feedback information including the position of the user terminal and the request data to the visible light communication control device.

In step 603, the user terminal receives information from the light emitting diode located closest to the user terminal.

A user terminal according to an exemplary embodiment of the present invention may receive information from a plurality of light emitting diodes that are determined to be located closest to the user terminal among the plurality of light emitting diodes based on feedback information and positions of the plurality of light emitting diodes.

A user terminal according to an exemplary embodiment of the present invention may receive information from a light emitting diode among a plurality of light emitting diodes by comparing a position of a user terminal included in feedback information with a position of a plurality of light emitting diodes.

For example, when there are a plurality of user terminals in a service zone of a light emitting diode determined among a plurality of light emitting diodes, a plurality of user terminals may determine the light emitting diodes based on the respective distances from the determined light emitting diodes to the plurality of user terminals. Lt; RTI ID = 0.0 > wavelengths. ≪ / RTI >

For example, the user terminal may connect a visible light communication link with the determined light emitting diode.

Methods according to the claims or the embodiments described in the specification may be implemented in hardware, software, or a combination of hardware and software.

Such software may be stored on a computer readable storage medium. The computer-readable storage medium includes at least one program (software module), at least one program that when executed by the at least one processor in an electronic device includes instructions that cause the electronic device to perform the method of the present invention .

Such software may be in the form of non-volatile storage such as volatile or read only memory (ROM), or in the form of random access memory (RAM), memory chips, For example, in the form of a memory such as an integrated circuit or in the form of a compact disc-ROM (CD-ROM), a digital versatile disc (DVDs), a magnetic disc, tape, or the like. < / RTI >

The storage and storage media are embodiments of machine-readable storage means suitable for storing programs or programs, including instructions that, when executed, implement the embodiments.

Embodiments provide a program including code for implementing an apparatus or method as claimed in any one of the claims herein, and a machine-readable storage medium storing such a program.

Furthermore, such programs may be electronically delivered by any medium, such as a communication signal carried over a wired or wireless connection, and the embodiments suitably include equivalents.

In the above-described specific embodiments, elements included in the invention have been expressed singular or plural in accordance with the specific embodiments shown.

It should be understood, however, that the singular or plural representations are selected appropriately for the sake of convenience of description and that the above-described embodiments are not limited to the singular or plural constituent elements, , And may be composed of a plurality of elements even if they are represented by a single number.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

100: visible light communication control device
110:
120:
130: Light emitting diode part
131: first light emitting diode
132: second light emitting diode
133: Third light emitting diode
140:
141: RGB control unit
142: Pulse modulation section
200: User terminal
201: first user terminal
202: second user terminal
203: third user terminal
204: fourth user terminal
210:
220:
230: Optical communication unit
231: first photodiode
232: second photodiode
233: Third photodiode
234: Fourth photodiode
240:
241: first pulse demodulating section
242: second pulse demodulator
243: Third pulse demodulator
244: Fourth pulse demodulator
310: Ethernet / Powerline
401: first optical channel
402: second optical channel
403: Third optical channel

Claims (20)

Determining the position of the plurality of light emitting diodes based on power of a signal received from a plurality of light emitting diodes (LEDs);
Receiving feedback information via Wi-Fi from at least one user terminal;
Determining a light emitting diode located closest to the at least one user terminal among the plurality of light emitting diodes based on the feedback information and the position of the plurality of light emitting diodes; And
And transmitting information to the at least one user terminal using the determined light emitting diode
A method of operating a visible light communication (VLC) communication control device.
The method according to claim 1,
Wherein the transmitting the information to the at least one user terminal comprises:
Determining the wavelengths of the determined light emitting diodes based on respective distances from the determined light emitting diodes to the plurality of user terminals when a plurality of user terminals exist in the service zone of the determined light emitting diode,
And transmitting information to the plurality of user terminals based on the determined wavelengths
A method of operating a visible light communication control device.
3. The method of claim 2,
The determined wavelengths of the light emitting diode are related to the mixing ratio of the R (red) channel, G (green) and B (blue)
The blending ratio may be a ratio of the distance between the user terminals and the light emitting diodes
A method of operating a visible light communication control device.
The method according to claim 1,
Wherein the feedback information includes a location of the at least one user terminal and request data
A method of operating a visible light communication control device.
The method according to claim 1,
Wherein the transmitting the information to the at least one user terminal comprises:
And connecting a visible light communication link between the determined light emitting diode and the at least one or more user terminals
A method of operating a visible light communication control device.
Transmitting feedback information through a Wi-Fi to a visible light communication (VLC) control device;
Receiving information from a light emitting diode determined to be located closest to the user terminal among the plurality of light emitting diodes based on the position of the feedback information and the plurality of light emitting diodes (LEDs)
A method of operating a user terminal.
The method according to claim 6,
Wherein the step of receiving information from the determined light-
Determining information from the determined light emitting diodes based on wavelengths determined based on respective distances from the determined light emitting diodes to the plurality of user terminals when there is a plurality of user terminals in the service zone of the determined light emitting diode, ≪ / RTI >
A method of operating a user terminal.
8. The method of claim 7,
The determined wavelengths,
R (red) channel, G (green) and B (blue) channels,
The blending ratio may be a ratio of the distance between the user terminals and the light emitting diodes
A method of operating a user terminal.
The method according to claim 6,
Wherein the feedback information includes at least one of a location of the plurality of user terminals,
A method of operating a user terminal.
The method according to claim 6,
Wherein the step of receiving information from the determined light-
And connecting a visible light communication link between the determined light emitting diode and the plurality of user terminals
A method of operating a user terminal.
A plurality of light emitting diodes (LEDs) for performing visible light communication (VLC);
A communication unit for performing Wi-Fi communication; And
And a control unit for controlling the plurality of light emitting diodes and the communication unit,
The control unit may determine the position of the plurality of light emitting diodes based on the power of the signal received from the plurality of light emitting diodes, receive feedback information from the at least one user terminal via Wi-Fi, Determining a light emitting diode located closest to the at least one user terminal among the plurality of light emitting diodes based on the positions of the plurality of light emitting diodes and transmitting the information to the at least one user terminal using the determined light emitting diode Transmitting
A visible light communication control device.
12. The method of claim 11,
Wherein,
Determining wavelengths of the determined light emitting diodes based on respective distances from the determined light emitting diodes to the plurality of user terminals when a plurality of user terminals exist in a service zone of the determined light emitting diode, And transmitting information to the plurality of user terminals based on the determined wavelengths
A visible light communication control device.
13. The method of claim 12,
The wavelengths of the determined light-
R (red) channel, G (green) and B (blue) channels,
The blending ratio may be a ratio of the distance between the user terminals and the light emitting diodes
A visible light communication control device.
12. The method of claim 11,
Wherein the feedback information includes a location of the at least one user terminal and request data
A visible light communication control device.
12. The method of claim 11,
Wherein,
Connecting the visible light communication link between the determined light emitting diode and the at least one or more user terminals
A visible light communication control device.
A communication unit for transmitting feedback information through a Wi-Fi to a visible light communication (VLC) control device; And
And an optical communication unit for receiving information from the light emitting diodes determined to be located closest to the user terminal among the plurality of light emitting diodes based on the position of the feedback information and the plurality of light emitting diodes (LEDs)
User terminal.
17. The method of claim 16,
The optical communication unit includes:
Determining information from the determined light emitting diodes based on wavelengths determined based on respective distances from the determined light emitting diodes to the plurality of user terminals when there is a plurality of user terminals in the service zone of the determined light emitting diode, Receiving
User terminal.
18. The method of claim 17,
The determined wavelengths,
R (red) channel, G (green) and B (blue) channels,
The blending ratio may be a ratio of the distance between the user terminals and the light emitting diodes
User terminal.
17. The method of claim 16,
Wherein the feedback information includes at least one of a location of the plurality of user terminals,
User terminal.
17. The method of claim 16,
And a controller for connecting a visible light communication link between the determined light emitting diode and the plurality of user terminals
User terminal.

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