KR101924292B1 - Apparatus and method for transmitting data by utilizing color interleaving in visible light communication system - Google Patents

Abstract

According to the present invention, disclosed are an apparatus for transmitting data by utilizing color interleaving in a visible light communication system and a method thereof. According to one embodiment of the present invention, the apparatus for transmitting data may comprise: a data transmission area determining unit determining a plurality of data transmission areas formed respectively by a plurality of lighting devices; feedback receiving units, each formed by the plurality of data transmission areas and provided to receive feedback information on interference among a plurality of color channels having the same channel length from a user terminal device; a preference receiving unit receiving preference information of data transmitted through the plurality of color channels from the user terminal device; and a color interleaving unit provided to differently change the length and a color pattern of each of the plurality of color channels based on the received feedback information and the received preference information. According to the present invention, it is possible to reduce inter-channel interference and bust errors occurring depending on the superposition of data transmission areas in an indoor environment and the nature of light.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING DATA BY UTILIZING COLOR INTERLEAVING IN VISIBLE LIGHT COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical idea for enhancing data transmission efficiency by performing color interleaving on a color channel in a visible light communication system, The present invention relates to a data transmission apparatus and a data transmission method for reducing interchannel interference based on performance of data transmission and improving data transmission rate.

With the emergence of the fourth industrial revolution, convergence technologies such as Internet of Things (IoT) and ICT (Information and Communication Technologies) have attracted attention.

In addition, in line with the fourth industrial revolution, a visible light communication system based on LED (Light Emitting Diode) has been actively studied as a next generation wireless communication system.

Wireless communication using visible light such as LED can be wireless communication while maintaining the inherent lighting function of the LED in an indoor environment.

In addition, communication is possible using LED lighting installed in places such as hospitals and aircraft where radio frequency (RF) radio communication is restricted.

And RF wireless communication uses limited frequency resources and large amount of data due to the narrow frequency band, or the surge of users causes traffic problems and causes performance degradation.

However, visible light wireless communication has more than 10,000 times more available frequency band compared to conventional RF wireless communication, so that frequency resources can be used indefinitely more than existing RF wireless communication. Also, traffic problems caused by the use of large amount of data, The frequency band can solve this problem.

In addition, since data is transmitted and received using a light resource, it is possible to realize a high-speed mobile data transmission environment at a speed of light faster than conventional electromagnetic waves.

Therefore, visible light wireless communication is a green IT convergence technology that can create new value not only in communication but also in existing lighting and display fields through convergence with the lighting industry.

However, LED-based visible light communication systems must consider the properties of light (reflection, diffraction, superposition, scattering).

However, due to these light properties, the transmitted data may be damaged. In addition, burst data may cause burst errors due to corrupted data.

The data in which the burst error occurs can not be restored, and the bit error rate (BER) performance of the system is deteriorated. Therefore, there is a need to search for solutions to the above problems.

Korean Patent No. 10-1517202, "Channel Assignment Method in Visible Light Communication System" Korean Patent No. 10-1661375, " Apparatus and method for interference mitigation and channel selection in visible light communication " Korean Patent Laid-Open No. 10-1333300, "Visible light wireless communication receiver for receiving multi-color channels and receiving method thereof"

An object of the present invention is to provide an apparatus and a method for transmitting data by utilizing color interleaving in a visible light communication system.

An object of the present invention is to reduce interchannel interference and burst errors that may occur depending on the nature of light and the overlapping of data transfer areas in an indoor environment.

The present invention aims to improve the performance of a visible light communication system by reducing interchannel interference and burst errors.

It is an object of the present invention to provide a service that satisfies a data transmission rate and a QoS (Quality of Service) required by users by adjusting the lengths of RGB (Red, Green, Blue) wavelengths and applying different interleaving lengths .

It is an object of the present invention to prevent data from being damaged due to light properties such as reflection, diffraction, superposition, and scattering by applying different interleaving lengths by adjusting the length of RGB wavelengths.

The object of the present invention is to protect the data transmitted through each color channel by decreasing the wavelength length of the color channel as the priority of data transmitted through the color channel is lowered.

 According to an embodiment of the present invention, a data transfer apparatus includes a data transfer area determination unit for determining a plurality of data transfer areas formed by each of a plurality of illumination devices, A preference receiver for receiving preference information of data transmitted through the plurality of color channels from the user terminal, and a receiver for receiving feedback of the received feedback from the user terminal, And a color interleaving unit for changing the length and the color pattern of each of the plurality of color channels differently based on the information and the received preference information.

According to an embodiment of the present invention, the color interleaving unit may identify a burst error related to interference between the plurality of color channels based on the feedback information, and determine a length and a color pattern of each of the plurality of color channels So that the identified burst error can be eliminated.

According to an embodiment of the present invention, when the user terminal device is located in an overlapped data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, From the user terminal device, the feedback information related to the degree of interference between the first color channel and the second color channel of the plurality of color channels in the overlapping data delivery area.

According to an embodiment of the present invention, when the user terminal is located in an overlapped data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, Receiving the preference information from the user terminal device as selection information for either the first data or the second data transmitted through the first color channel and the second color channel among the plurality of color channels in the overlapped data delivery area .

According to an embodiment of the present invention, the data transmission apparatus may further include a priority determination unit that determines the priority of each of the plurality of color channels based on the received feedback information and the received preference information.

According to an embodiment of the present invention, when the user terminal device is located in an overlapped data transfer area formed by a first data transfer area and a second data transfer area of the plurality of data transfer areas, Increase the length of the first color channel associated with the first data delivery area conveying selected data by the user terminal device and reduce the length of the second color channel associated with the second data delivery area.

According to an embodiment of the present invention, when the user terminal device is located in the overlapping data delivery area, the color interleaving unit may transmit the channel interference to the second data delivery area, The length of the two color channels may be decreased, and the length of the first color channel may be increased.

According to an embodiment of the present invention, the color interleaving section determines a first color pattern based on the increased length of the first color channel and determines a second color pattern based on the reduced length of the second color channel .

According to an embodiment of the present invention, a data transmission apparatus transmits first data through the first color channel having the increased length and the first color pattern from the overlapped data delivery region to the user terminal apparatus, And a data transmission unit for transmitting the second data through the second color channel having the reduced length and the second color pattern.

According to an embodiment of the present invention, a user terminal includes a feedback transmission unit for transmitting feedback information on interference between a plurality of color channels having the same channel length to a data transmission device, a data transmission unit for transmitting And transmitting the preference information of the data to the data transmission apparatus through the length and color pattern of each of the plurality of color channels differently changed by the data transmission apparatus based on the transmitted feedback information and the transmitted preference information, And a data receiving unit for receiving data from the apparatus.

According to an embodiment of the present invention, there is provided a data transmission method comprising the steps of: determining a plurality of data transmission areas formed by a plurality of illumination devices in a data transmission area determination unit; determining, by the plurality of data transmission areas, Receiving feedback information on interference between a plurality of color channels having the same channel length from the user terminal device, and transmitting preference information of data transmitted through the plurality of color channels to the user terminal device, And varying the length and color pattern of each of the plurality of color channels differently based on the received feedback information and the received preference information in the color interleaving section.

According to an embodiment of the present invention, the step of receiving the feedback information may include a step of receiving the feedback information from the user terminal device in the overlapping data delivery area formed by the first data delivery area and the second data delivery area of the plurality of data delivery areas, Receiving the feedback information related to the degree of interference between the first color channel and the second color channel of the plurality of color channels in the superposed data delivery area from the user terminal device.

According to an embodiment of the present invention, the step of receiving the preference information may include receiving the preference information from the user terminal device in the overlapping data delivery area formed by the first data delivery area and the second data delivery area of the plurality of data delivery areas, The selection information for one of the first data and the second data transmitted from the user terminal through the first color channel and the second color channel among the plurality of color channels in the overlap data transfer area, And receiving the information.

According to an embodiment of the present invention, the step of changing the length and the color pattern of each of the plurality of color channels differently may be performed by the user terminal device in the first data transfer area and the second data transfer area Increases the length of a first color channel associated with the first data transfer area for transferring data selected by the user terminal device when the second data transfer area is located in an overlapping data transfer area formed by the second data transfer area, Reducing the length of the second color channel and reducing the length of the second color channel associated with the second data delivery area causing channel interference with the first data delivery area, .

The present invention can reduce interchannel interference and burst errors that may occur depending on the nature of light and the overlapping of the data transfer area in an indoor environment.

The present invention can improve the performance of a visible light communication system by reducing interchannel interference and burst errors.

The present invention can provide a service that satisfies the data transmission rate and QoS (Quality of Service) required by users by adjusting the length of the RGB wavelength and applying different interleaving lengths.

The present invention can prevent damage to data transmitted due to light properties such as reflection, diffraction, superposition, and scattering by applying different interleaving lengths by adjusting the length of the RGB wavelengths.

The present invention can reduce the wavelength length of the color channel and protect the data transmitted through each color channel as the priority is lowered.

1 is a view for explaining components of a visible light communication system according to an embodiment of the present invention.
2 is a block diagram illustrating a data transmission apparatus according to an exemplary embodiment of the present invention.
FIG. 3 is a diagram illustrating components of a user terminal according to an exemplary embodiment of the present invention. Referring to FIG.
4 is a diagram illustrating color channels according to variable RGB interleaving according to an embodiment of the present invention.
5 and 6 are diagrams illustrating a flow chart associated with a data transmission method 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 is a view for explaining components of a visible light communication system according to an embodiment of the present invention.

1, a visible light communication system 100 according to an embodiment of the present invention includes a data transmission device 110, a plurality of illumination devices 121, 122, 123, and at least one user terminal device 130, 131 ).

For example, the visible light communication system 100 transmits data to the at least one user terminal device using the plurality of illumination devices.

According to an embodiment of the present invention, the data transmission apparatus 110 may use only the first illuminating device 121, the second illuminating device 122, and the third illuminating device 123 to the extent allowed by each illuminating device Data can be transmitted using light.

That is, the data transmission device 110 can transmit data to the data transfer area formed by each of the plurality of illumination devices using light.

For example, the data transmission device 110 can transmit the first data to the first user terminal device 130 located in the data delivery area of the first illumination device 121 using the first illumination device 121 have.

According to an embodiment of the present invention, the data transmission apparatus 110 may transmit the second data and the third data through the second illuminating device 122 and the third illuminating device 123. [

For example, when the second user terminal device 131 is located in the overlap area of the data delivery area formed by the second illumination device 122 and the data delivery area formed by the third illumination device 123, The second user terminal device 131 may selectively receive either the second data or the third data.

For example, when a user using the second user terminal device 131 visits the museum and receives second data in a data delivery area formed by the second illuminating device, and while watching content based on the second data, The second data and the third data may be received redundantly, and the reception rate of the second data and the third data may be reduced.

When the user using the second user terminal device 131 transmits the preference information indicating the intention of receiving the third data to the data transmission apparatus 110, the data transmission apparatus 110 transmits the preference information to the third lighting apparatus 123 The wavelength length and the color pattern of the color channel of the data transmission area formed by the first data transmission area can be changed to alleviate the interference with the color channel for transmitting the second data.

The present invention can prevent damage to data transmitted due to light properties such as reflection, diffraction, superposition, and scattering by applying different interleaving lengths by adjusting the length of the RGB wavelengths.

Hereinafter, the configuration for reducing interchannel interference and burst error occurring according to the superposition of the data transfer area and the nature of light in the visible light communication system 100 will be described in more detail with reference to FIGS. 2 to 6. FIG.

2 is a block diagram illustrating a data transmission apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the data transmission apparatus 200 includes a data transmission area determination unit 210, a data reception unit 220, and a color interleaving unit 230 according to an exemplary embodiment of the present invention.

According to an embodiment of the present invention, the data transfer area determination unit 210 determines a plurality of data transfer areas formed by each of the plurality of illumination devices.

In one example, the plurality of illumination devices includes a first illumination device, a second illumination device, and an Nth illumination device, and each of the first illumination device, the second illumination device, and the Nth illumination device forms a data transfer area. Here, N represents an arbitrary natural number.

According to an embodiment of the present invention, the data transfer area determination unit 210 may determine the first data transfer area, the second data transfer area, and the Nth data transfer area.

That is, the data transfer area determination unit 210 can determine the range of the data transfer area formed by each of the plurality of illumination devices.

For example, the data delivery area may include a field of view (FOV) in an indoor environment.

According to an embodiment of the present invention, the data receiving unit 220 includes a feedback receiving unit 222 and a preference receiving unit 224.

According to an embodiment of the present invention, the feedback receiver 222 is formed by a plurality of data transfer areas, and receives feedback information on interference between a plurality of color channels having the same channel length from the user terminal device.

For example, the color channel may include an RGB channel. Here, the RGB channel includes a data channel for transmitting data in combination of red, green, and blue colors.

In one example, the feedback receiver 222 may receive feedback information on a plurality of inter-color channel interferences for conveying data to a target device located within a range of a plurality of data delivery areas.

For example, when the user terminal device is located in the overlapping area of the first data transfer area and the second data transfer area, the feedback receiver 222 receives the first color channel formed by the first data transfer area and the second data And may receive feedback information on the second inter-color channel interference formed by the transmission region.

That is, when the user terminal device is located in the overlapped data delivery area formed by the first data delivery area and the second data delivery area of the plurality of data delivery areas, the feedback receiver 222 receives the overlapped data delivery area The first color channel and the second color channel among the plurality of color channels.

In the above description, the first data transfer area and the second data transfer area are described as an example, but the present invention is not limited to the area but can be changed according to the location of the user terminal.

According to an embodiment of the present invention, the preference receiving unit 224 receives preference information of data transmitted through a plurality of color channels from a user terminal device.

For example, when the user terminal device is located in an overlapped data delivery area formed by the first data delivery area and the second data delivery area of the plurality of data delivery areas, May receive preference information as selection information for either the first data or the second data transmitted through the first color channel and the second color channel among the plurality of color channels.

For example, the preference information includes the importance of data requested by the user, the type of data (e.g., text, multimedia, etc.), the user's communication plan, the user's device, and the Quality of Service (QoS) .

According to an embodiment of the present invention, the color interleaving unit 230 changes the length and the color pattern of each of the plurality of color channels differently based on the feedback information and the preference information.

In one example, the color interleaving unit 230 identifies a burst error related to interference between a plurality of color channels based on the feedback information.

According to an embodiment of the present invention, the color interleaving unit 230 may change the length and the color pattern of each of the plurality of color channels to eliminate the burst error.

The present invention can reduce interchannel interference and burst errors that may occur depending on the nature of light and the overlapping of the data transfer area in an indoor environment.

The present invention can improve the performance of a visible light communication system by reducing interchannel interference and burst errors.

For example, when a user terminal device is located in an overlapping data delivery area formed by a first data delivery area and a second data delivery area of a plurality of data delivery areas, the color interleaving part 230 may select Increase the length of the first color channel associated with the first data transfer area carrying data and reduce the length of the second color channel associated with the second data transfer area.

According to an embodiment of the present invention, when the user terminal device is located in the overlapping data delivery area, the color interleaving unit 230 may transmit the second color channel The length of the first color channel can be reduced, and the length of the first color channel can be increased.

For example, the color interleaving section 230 may determine the first color pattern based on the increased length of the first color channel and the second color pattern based on the reduced length of the second color channel.

The color interleaving unit 230 according to an embodiment of the present invention forms color channels based on variable color interleaving and can determine the intensity of light and the type of light according to the combination thereof.

The configuration in which the color interleaving section 230 determines the color pattern of each color channel will be described in more detail in the description of FIG.

According to another embodiment of the present invention, the data transmission apparatus 200 includes a priority determination unit 240 and a data transmission unit 250.

In one example, the priority determining unit 240 may determine the priority of each of the plurality of color channels based on the feedback information and the preference information.

For example, the priority determining unit 240 may determine channel interference between the first data delivery area, the second data delivery area, and the third data delivery area based on the feedback information.

For example, the priority determining unit 240 may be configured to determine the priority of the data transmitted through the first data delivery area, the second data delivery area, and the third data delivery area based on the selection of data transmitted through the first data delivery area, And the third data transfer area.

In one example, the data transmission unit 250 transmits the first data through the first color channel having the increased length and the first color pattern from the overlapping data delivery area to the user terminal, Pattern of the second color channel.

That is, the data transmitting unit 250 may control the plurality of illuminating devices to transmit data based on the color channel length and the color pattern changed by the color interleaving unit 230. [

FIG. 3 is a diagram illustrating components of a user terminal according to an exemplary embodiment of the present invention. Referring to FIG.

3, the user terminal 300 includes a data transmission unit 310 and a data reception unit 320. [

According to an embodiment of the present invention, the data transmission unit 310 includes a feedback transmission unit 312 and a preference transmission unit 314.

For example, the feedback transmission unit 312 transmits feedback information on interference between a plurality of color channels having the same channel length to the data transmission apparatus.

That is, the feedback transmission unit 312 transmits feedback information related to the channel interference index between the color channels transmitted to the overlapping area to the data transmission apparatus.

According to an embodiment of the present invention, the preference transmitter 314 may transmit preference information of data transmitted through a plurality of color channels to a data transmission apparatus.

According to an embodiment of the present invention, the data receiving unit 320 receives data from the data transmission apparatus through the length and color pattern of each of the plurality of color channels differently changed by the data transmission apparatus based on the feedback information and the preference information .

According to an embodiment of the present invention, the data receiving unit 320 receives data from a data transmission apparatus through a length and a color pattern of each of a plurality of color channels changed differently, and de-interleaves the received data. To restore the data.

For example, the data receiving unit 320 may perform deinterleaving on data using a turbo code.

4 is a diagram illustrating color channels according to variable RGB interleaving according to an embodiment of the present invention.

Referring to FIG. 4A, the first color channel 401, the second color channel 402, and the third color channel 403 have the same channel length. That is, the first color channel 401, the second color channel 402, and the third color channel 403 have the same wavelength length.

Here, the first color channel 401, the second color channel 402, and the third color channel 403 represent color channels before being changed by the data transmission apparatus based on the feedback information and the preference information.

The color pattern of the first color channel 401 is composed of red, red, red, blue, blue, green, green, and green, and has nine block lengths.

The color pattern of the second color channel 402 is composed of green, green, green, red, red, blue, blue, and blue, and has nine block lengths.

The color pattern of the third color channel 403 is composed of blue, blue, blue, green, green, red, red, and red, and has nine block lengths.

The first color channel 401, the second color channel 402, and the third color channel 403 have the same channel length and may cause mutual channel interference and burst errors according to different color patterns.

Referring to FIG. 4B, the first color channel 411, the second color channel 412, and the third color channel 413 have different channel lengths.

Here, the first color channel 411, the second color channel 412, and the third color channel 413 represent the color channel changed by the data transmission apparatus based on the feedback information and the preference information.

In one example, the priority of the first color channel 411 is the highest, the priority of the second color channel 412 is the lowest, and the third color channel 413 is the intermediate ranking.

In one example, the length of the first color channel 411 is the longest, and the length of the second color channel 412 is the shortest.

The color pattern of the first color channel 411 includes red, blue, green, red, blue, green, red, blue, green, red, blue and green.

The color pattern of the second color channel 412 is composed of green, blue, red, green, blue, red, green, and blue, and has eight block lengths.

The color pattern of the third color channel 413 includes blue, red, green, blue, red, green, blue, red, green, and blue.

The first color channel 401, the second color channel 402 and the third color channel 403 have different channel lengths and can reduce mutual channel interference and burst errors according to different color patterns.

The present invention can determine the priority level for each channel based on the inter-channel interference and the user's preference, and set the length of the color channel differently according to the determined priority.

Accordingly, as the priority is lowered, the wavelength length of the color channel can be reduced to protect the data transmitted through each color channel.

The present invention can provide a service that satisfies the data transmission rate and QoS (Quality of Service) required by users by adjusting the length of the RGB wavelength and applying different interleaving lengths.

5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, a data transfer method determines a plurality of data transfer areas. That is, the data transfer method can determine a plurality of data transfer areas formed by each of the plurality of illumination devices.

The data transmission method in step 502 receives feedback information on interference between a plurality of color channels.

That is, the data transmission method is formed by a plurality of data transmission areas from the user terminal device, and can receive feedback information on interference between a plurality of color channels having the same channel length.

In step 503, the data transfer method receives preference information of data associated with a plurality of color channels.

That is, the data transmission method receives preference information of data transmitted through a plurality of data delivery areas from a user terminal device.

The data transfer method in step 504 changes the length and color pattern of each of the plurality of color channels.

That is, the data transmission method may change the length and color pattern of each of the plurality of color channels differently based on the feedback information and the preference information.

6 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

Referring to FIG. 6, in step 601, the data transmission method determines whether the user terminal device is located in the overlap area.

That is, the data transmission method determines whether or not the user terminal device is located in the overlap area based on whether or not the communication connection state with the user terminal device is established.

For example, if the user terminal device is located in the overlap area, the data transmission method proceeds to step 602, and if the user terminal device is not located in the overlap area, the procedure ends.

In step 602, the data transmission method determines whether or not feedback information is received. That is, if the feedback information is received, the data transmission method proceeds to step 603, and if the feedback information is not received, the procedure is terminated.

In step 603, the data transmission method determines whether or not the preference information is received. That is, if the preference information is received, the data transmission method proceeds to step 604, and if the preference information is not received, the method proceeds to step 605.

In step 604, the data transmission method determines whether the user terminal device prefers data in the first data delivery area of the overlap area.

That is, the data transmission method receives the feedback information and the preference information from the user terminal located in the overlapping area of the first data delivery area and the second data delivery area, and transmits the feedback information and the preference information through the first data delivery area And judges the preference of the transmitted data.

For example, if the user terminal device prefers the data of the first data transfer area, the data transfer method proceeds to step 605, and if the data of the second data transfer area is preferred, the method proceeds to step 606 .

In step 605, the data transmission method determines whether channel interference exists between the first data transmission area and the second data transmission area.

That is, if there is channel interference, the data transmission method proceeds to step 607, and if there is no channel interference, the corresponding procedure is terminated.

In step 606, the data transmission method determines whether channel interference exists between the first data transmission area and the second data transmission area.

That is, if there is channel interference, the data transmission method proceeds to step 608, and if there is no channel interference, terminates the procedure.

In step 607, the data transmission method increases the length of the first color channel and decreases the length of the second color channel.

That is, the data transmission method increases the wavelength length of the first color channel and decreases the wavelength length of the second color channel.

In step 608, the data transmission method decreases the length of the first color channel and increases the length of the second color channel.

That is, the data transmission method reduces the wavelength length of the first color channel and increases the wavelength length of the second color channel.

In step 609, the data transmission method changes the color patterns of the first color channel and the second color channel based on the changed channel length.

That is, the data transmission method determines the color pattern according to the channel length of the first color channel, and determines the color pattern according to the channel length of the second color channel. Here, the determined color pattern can be determined according to the description of FIG.

In step 610, the data transmission method transmits data through the first color channel and the second color channel.

That is, the data transmission method transmits data through the first color channel and the second color channel using the changed channel length and the color pattern in step 609.

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 exemplary 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.

200: data transmission apparatus 210: data transmission area determination unit
220: Data receiving section 222:
224: preference receiving unit 230: color interleaving unit
240: priority determining unit 250:
300: User terminal device 310: Data transmission unit
312: feedback transmission unit 314: preference transmission unit
320: Data receiving unit

Claims (14)

A data transmission area determination unit for determining a plurality of data transmission areas formed by each of the plurality of illumination devices;
A feedback receiver configured to receive feedback information on interference between a plurality of color channels having the same channel length, respectively, from the user terminal, the feedback information being formed by the plurality of data transfer areas;
A preference receiver for receiving preference information of data transmitted through the plurality of color channels from the user terminal; And
And a color interleaving unit for changing the length and the color pattern of each of the plurality of color channels differently based on the received feedback information and the received preference information
A device for transmitting data in a visible light communication system.
The method according to claim 1,
Wherein the color interleaving unit identifies a burst error related to interference between the plurality of color channels based on the feedback information and changes the length and color pattern of each of the plurality of color channels to different, To eliminate burst errors
A device for transmitting data in a visible light communication system.
The method according to claim 1,
When the user terminal device is located in an overlapping data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, Receiving the feedback information related to the degree of interference between the first color channel and the second color channel of the plurality of color channels in the region
A device for transmitting data in a visible light communication system.
The method according to claim 1,
When the user terminal device is located in an overlapped data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, Receiving the preference information as selection information for either the first data or the second data transmitted through the first color channel and the second color channel among the plurality of color channels in the region
A device for transmitting data in a visible light communication system.
The method according to claim 1,
And a priority determination unit for determining a priority of each of the plurality of color channels based on the received feedback information and the received preference information
A device for transmitting data in a visible light communication system.
The method according to claim 1,
When the user terminal device is located in an overlapping data delivery area formed by the first data delivery area and the second data delivery area of the plurality of data delivery areas, the color interleaving part may transmit the data selected by the user terminal device Increasing the length of the first color channel associated with the first data transfer area to transfer and decreasing the length of the second color channel associated with the second data transfer area
A device for transmitting data in a visible light communication system.
The method according to claim 6,
Wherein the color interleaving unit reduces the length of the second color channel associated with the second data transfer area that generates channel interference with the first data transfer area when the user terminal device is located in the overlapping data transfer area , Increasing the length of the first color channel
A device for transmitting data in a visible light communication system.
8. The method of claim 7,
The color interleaving unit determines a first color pattern based on the increased length of the first color channel and determines a second color pattern based on the reduced length of the second color channel
A device for transmitting data in a visible light communication system.
9. The method of claim 8,
Transmitting the first data through the first color channel having the increased length and the first color pattern from the overlapping data delivery area to the user terminal device, and transmitting the first data through the first color channel having the reduced length and the second color pattern And a data transmission unit for transmitting the second data through the second color channel
A device for transmitting data in a visible light communication system.
A feedback transmission unit for transmitting feedback information on interference between a plurality of color channels having the same channel length to a data transmission apparatus;
A preference transmission unit for transmitting preference information of data transmitted through the plurality of color channels to a data transmission device; And
And a data receiving unit for receiving data from the data transmission apparatus through a length and color pattern of each of a plurality of color channels differently changed by the data transmission apparatus based on the transmitted feedback information and the transmitted preference information,
Wherein the data transmission device determines a plurality of data transmission areas formed by each of the plurality of illumination devices and is configured to receive feedback of interference between a plurality of color channels having the same channel length, Receiving information from the user terminal device, receiving preference information of data transmitted through the plurality of color channels from the user terminal device, and receiving preference information of the plurality of color channels based on the received feedback information and the received preference information, Each length and color pattern are changed differently
A user terminal device in a visible light communication system.
Determining, in the data transfer area determination unit, a plurality of data transfer areas formed by each of the plurality of illumination devices;
Receiving feedback information on interference between a plurality of color channels having the same channel length, each of which is formed by the plurality of data transfer areas, from a user terminal device;
Receiving preference information of data transmitted through the plurality of color channels from the user terminal device at a preference receiving unit; And
In a color interleaving section, varying the length and color pattern of each of the plurality of color channels differently based on the received feedback information and the received preference information
A method of transmitting data in a visible light communication system.
12. The method of claim 11,
Wherein the step of receiving the feedback information comprises:
When the user terminal device is located in an overlapped data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, Receiving the feedback information related to the degree of interference between the first color channel and the second color channel of the color channel
A method of transmitting data in a visible light communication system.
12. The method of claim 11,
Wherein the step of receiving the preference information comprises:
When the user terminal device is located in an overlapped data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, And receiving the preference information as selection information for either the first data or the second data transmitted through the first color channel and the second color channel among the color channels
A method of transmitting data in a visible light communication system.
12. The method of claim 11,
Wherein changing the length and color pattern of each of the plurality of color channels differently comprises:
When the user terminal device is located in an overlapping data delivery area formed by a first data delivery area and a second data delivery area of the plurality of data delivery areas, Increasing the length of the first color channel associated with the data delivery area and decreasing the length of the second color channel associated with the second data delivery area; And
Decreasing the length of the second color channel associated with the second data transfer area causing channel interference with the first data transfer area and increasing the length of the first color channel
A method of transmitting data in a visible light communication system.

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