KR20180065757A - RECEPTION DEVICE FOR PROVIDING Li-FI/OCC combined VISIBLE LIGHT COMMUNICATION AND METHOD FOR THERE OF - Google Patents

Abstract

The present invention relates to a visible light communication method capable of operating high-speed visible light communication based on photo diode (PD) such as Li-Fi and low-speed visible light communication based on optical camera communication (OCC) simultaneously in a smart device. A camera in the smart device is used as a receiver for low-speed communication, and a photo diode (PD) embedded in the smart device is used as a receiver for high-speed communication. The smart device capable of high and low speed visible light communication includes: a fusion data receiving part receiving data at different speeds through the visible light communication; a memory storing a program for receiving the data through the visible light communication; and a processor executing the program stored in the memory. The processor executes the program to measure the transmission speed of data transmitted from a transmitting device and to set a reception speed of the fusion data receiving part based on the measured transmission speed, thereby receiving the transmitted data.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a receiving device capable of Li-FI / OCC combined visible light communication and a visible light communication method thereof.

The present invention relates to a visible light communication method capable of simultaneously operating PD (Photo Diode) -based high-speed visible light communication such as LiFi and low-speed visible light communication based on OCC (Optical Camera Communication) in a smart device, And a PD (Photo Diode) built in a smart device is used as a high-speed communication receiver.

Visible Light Communication (VLC), which is one of various wireless communication technologies, is a wireless communication method in which a signal is transmitted in a visible light having a wavelength of 380 to 780 nanometers and is continuously developed due to recent development of light emitting diode technology have.

Particularly, such a visible light communication technology is applied to various types of displays such as various signage panels and light pipes that emit visible light in addition to lighting devices.

For example, various information can be provided to a user having a visible light communication receiver through a display device included in a TV, a monitor, a smart device, or the like.

Meanwhile, in the visible light communication receiver according to the related art, since the speed at which the transmission data is received for each device is uniformly defined according to the performance of the device, the user must receive the data corresponding to the transmission speed of the transmission device, .

In this regard, Korean Patent Laid-Open Publication No. 10-2013-0058394 entitled " Receiving Device for Visible Light Communication ") discloses an audio communication method in which audio contents, text contents, image contents Discloses a technology for requesting information by an LED wireless transmitting unit containing data and receiving the content data as a packet and outputting content contents to a connected smart phone.

The embodiment of the present invention is characterized in that visible light communication is performed at high speed and low speed through a data receiving unit having different data receiving speeds, a camera is used as a low speed communication receiver, and a PD (Photo Diode) is used as a high speed communication receiver And provides a receiving device capable of receiving transmission data and a method of communicating the same through visible light.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a receiving device capable of high-speed and low-speed visible light communication according to an embodiment of the present invention includes a convergence data receiver for receiving data at different transmission rates through the visible light communication, And a processor for executing a program stored in the memory and a memory for storing a program for receiving data via communication. At this time, as the program is executed, the processor measures the transmission rate of the transmission data transmitted from the transmission device, sets the reception rate of the fusion data reception unit on the basis of the measured transmission rate, do.

The convergence data receiving unit may include a first data receiving unit that receives transmission data at a speed equal to or higher than a preset threshold value through the visible light communication and a second data receiving unit that receives second data through the visible light communication at a speed lower than the predetermined threshold value And a receiving unit.

Wherein the processor compares the measured transmission rate with the preset threshold value and selects one of the first and second data receiving units based on the comparison result and selects either one of the selected first and second data receiving units It is possible to receive the transmission data in one.

The first data receiving unit may be a photodiode, and the second data receiving unit may be a camera.

The second data receiving unit may receive the transmission data based on a rolling shutter scheme.

When the transmitting device divides the visible light signal including the transmission data into a plurality of frames per second and outputs the divided data, the processor compares the number of frames per second with the preset threshold value, The transmission data can be received based on at least one of the transmission data.

A visible light communication method capable of receiving high-speed and low-speed data in a receiving device includes: measuring a transmission rate of the transmission data transmitted through visible light communication in a transmitting device; Comparing the measured transmission rate with the predetermined threshold value; Selecting one of the first and second data receiving units to receive the transmission data based on the comparison result, and receiving the transmission data to any one of the selected first and second data receiving units. At this time, the first and second data receiving units have different reception rates in different ranges.

The first data receiving unit may be a photodiode, and the second data receiving unit may be a camera.

The second data receiving unit may receive the transmission data based on a rolling shutter scheme.

According to any one of the above-mentioned objects of the present invention, it is possible to receive all of high-speed and low-speed data through one receiving device without having to separately provide the receiving device according to the transmission rate according to the visible light communication of the transmitting device have.

Further, by using a camera as a data receiving unit, there is an effect that position recognition and object tracking can be linked.

1 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.
2 is a block diagram of a transmitting device and a receiving device in accordance with an embodiment of the present invention.
3 and 4 are views for explaining a fusion data receiving unit.
5 is a flowchart of a visible light communication method according to an embodiment of the present invention.
6 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.
7 is an exemplary diagram of a receiving device capable of high-speed and low-speed visible light communication according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted.

Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise.

The present invention relates to a receiving device (200) capable of high-speed and low-speed visible light communication and a visible light communication method thereof.

The low-speed communication receiver uses a camera and the high-speed communication receiver uses a PD (Photo Diode). When a camera is used as a receiver, it is referred to as OCC (Optical Camera Communication), and when a PD is used, it is referred to as Li-Fi.

According to an embodiment of the present invention, transmission data can be received through visible light communication at high speed and low speed through a data receiving unit having different data receiving speeds.

The OCC method uses a camera as a receiver (using a rolling shutter method) and has a maximum reception performance of ~ 3 Kbps. Although the OCC method has low data reception performance, it has advantages that it is easy to link with location recognition and object tracking because it uses a camera.

Li-FI uses a PD as a receiver and can receive high-speed (~ 3Kbps) data and can receive high-speed data, but there is a difficulty in position recognition.

A receiving device capable of high-speed and low-speed visible light communication proposed by the present invention combines the advantages of (LiFi / OCC Hybrid) Li-Fi and OCC to enable communication from low speed to high speed, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The hatches of different shapes shown in the drawings of the present invention mean different colors.

1 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.

1, a visible light communication method according to an exemplary embodiment of the present invention includes a communication 110 for transmitting a visible light signal from a transmitting device 100 having a display 110 to a receiving device 200 having a converged data receiving unit 210, Method.

Here, the transmitting device 100 is a digital device having a display 110, and may be any one of a smart phone, a smart, a pad, a smart watch, a tablet PC, a monitor, and a TV.

The receiving device 200 may be a digital device having a fusion data receiving unit 210, and may be any one of a smart phone, a smart pad, a smart watch, and a tablet PC.

2 is a block diagram of a transmitting device 100 and a receiving device 200 in accordance with an embodiment of the present invention.

As shown in FIG. 2, the transmitting device 100 and the receiving device 200 include memories 120 and 220 and processors 130 and 230, respectively.

The transmitting device 100 includes a display 110 for transmitting a visible light signal including transmission data through visible light communication. The receiving device 200 includes a convergence data receiver (not shown) for receiving transmission data included in the visible light signal 210).

Here, the fusion data receiving unit 210 is configured to receive data at different transmission rates through visible light communication.

In the memories 120 and 220, a program for transmitting and receiving data by a visible light communication method is stored. Here, the memories 120 and 220 collectively refer to non-volatile storage devices and volatile storage devices that keep the stored information even when power is not supplied.

For example, the memory 120, 220 may be a compact flash (CF) card, a secure digital (SD) card, a memory stick, a solid-state drive (SSD) A magnetic computer storage device such as a NAND flash memory such as an SD card and a hard disk drive (HDD), and an optical disc drive such as a CD-ROM, a DVD-ROM, .

The programs stored in the memories 120 and 220 may be implemented in hardware such as software or an FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and may perform predetermined roles.

The processors 130 and 230 may modulate the transmission data into the modulated data and transmit the modulated data through the display 110 as the program stored in the memories 120 and 220 is executed, So that transmission data can be obtained.

Hereinafter, the receiving device 200 according to an embodiment of the present invention will be described in more detail.

The receiving device 200 according to an embodiment of the present invention can receive data at different transmission rates through the visible light communication in the fusion data receiving unit 210. [

For this, the processor 230 may measure the transmission rate of the transmission data transmitted from the transmission device 100, and set the reception rate of the fusion data receiver 210 based on the measured transmission rate to receive the transmission data .

The fusion data receiving unit 210 may include a first data receiving unit 211 and a second data receiving unit 212.

FIGS. 3 and 4 are views for explaining the fusion data receiving unit 210. FIG.

Referring to FIG. 4, the first data receiving unit 211 may receive transmission data at a rate higher than a preset threshold value through visible light communication. The first data receiving unit 211 may be a photodiode.

Referring to FIG. 3, the second data receiving unit 212 may receive transmission data at a rate lower than a preset threshold value through visible light communication. The second data receiving unit 212 may be a camera. At this time, when data is received through the camera, transmission data can be received based on the rolling shutter method.

Referring again to FIG. 2, the processor 230 can set the reception rate of the fusion data receiver 210 based on the measured transmission rate. Specifically, the processor 230 compares the measured transmission rate with a predetermined threshold value, Based on the result, any one of the first and second data receiving units 211 and 212 can be selected. The transmission data can be received using any one of the first and second data receiving units 211 and 212 selected as described above.

When receiving the transmission data using the first data receiving unit 211 composed of a photodiode, it is possible to receive data at a high speed (3 Kbps). The visible light communication technique for transmitting and receiving transmission data at such a high speed may be LiFi (Light Fidelity).

When receiving the transmission data using the first data receiving unit 211, it is possible to receive the high-speed data, but it is impossible to recognize the position.

Accordingly, the receiving device 200 according to an embodiment of the present invention can receive the transmission data using the second data receiving unit 212 composed of a camera.

When the transmission data is received through the second data receiving unit 212, the reception performance is low (~ 3 Kbps). However, since the camera uses the camera, it is possible to perform position recognition, object tracking, and the like. The visible light communication technique for transmitting and receiving transmission data may be OCC (Optical Camera Communication).

As described above, the receiving device 200 according to an embodiment of the present invention is advantageous in that it can receive data transmitted at high speed and low speed according to the LiFi scheme and OCC scheme through the fusion data receiver 210, .

3, when the transmitting device 100 divides a visible light signal including transmission data into a plurality of frames per second (fps, frame per second) and outputs the divided signals, It is possible to receive the transmission data based on at least one of the first and second data receiving units 211 and 212 by comparing the number with the predetermined threshold.

In the prior art, when the transmitting device divides each area of the display into two areas having a speed of, for example, 15 fps and 30 fps, and outputs images at different frame rates per second, the receiving device corresponding to 15 fps Area, and in the case of a high-performance receiving device, only the area corresponding to 30 fps had to be received.

However, the receiving device 200 according to an embodiment of the present invention receives the area corresponding to the high speed of 30 fps through the first composite data receiving unit 210 through the first data receiving unit 211 and the area corresponding to the low speed of 15 fps May be received through the second data receiving unit 212 and may receive transmission data using only one of the first and second data receiving units 211 and 212 or may be used for both 15 fps and 30 fps It is also possible to simultaneously receive the transmission data.

2 may be implemented in hardware such as software or an FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and may perform predetermined roles can do.

However, 'components' are not meant to be limited to software or hardware, and each component may be configured to reside on an addressable storage medium and configured to play one or more processors.

Thus, by way of example, an element may comprise components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, Routines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

The components and functions provided within those components may be combined into a smaller number of components or further separated into additional components.

Hereinafter, a visible light communication method capable of receiving high-speed and low-speed data in the receiving device 200 according to an embodiment of the present invention will be described with reference to FIG.

5 is a flowchart of a visible light communication method according to an embodiment of the present invention.

In the visible light communication method according to an embodiment of the present invention, first, the transmission speed of transmission data transmitted through the visible light communication in the transmission device 100 is measured (S110).

Next, the measured transmission rate is compared with a preset threshold value (S120), and one of the first and second data receiving units 211 and 212 to receive transmission data is selected based on the comparison result (S130, S131).

At this time, the first data receiving unit 211 may be a photodiode capable of receiving data at a high speed (3 Kbps), and the second data receiving unit 212 may be a camera capable of receiving low speed (~ 3 Kbps) data. On the other hand, if the second data receiving unit 212 is a camera, transmission data can be received based on the rolling shutter system.

Next, transmission data is received to any one of the selected first and second data receiving units 211 and 212 (S140 and S141).

Meanwhile, in the above description, steps S110 to S141 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed. In addition, the contents already described in Figs. 1 to 4 and those described in Figs. 6 to 7 described later can be applied to the visible light communication method of Fig. 5 even if other contents are omitted.

6 is a conceptual diagram for explaining a visible light communication method according to an embodiment of the present invention.

In FIG. 6, the transmitter can simultaneously transmit data of high speed (high frequency) and data of low speed (low frequency), and the camera and PD of the receiver can receive high speed data and low speed data, respectively.

The camera and the PD can receive data for each purpose. At this time, the camera can receive the position information, calculate the position based on the received data (OCC position recognition technology), and simultaneously use the PD The corresponding information can be received. Accordingly, the location-based service can be implemented by simultaneously receiving information corresponding to the user's current location and location.

7 is an exemplary diagram of a receiving device capable of high-speed and low-speed visible light communication according to an embodiment of the present invention.

A receiving device capable of high-speed and low-speed visible light communication proposed in the present invention can be configured as a pair of a camera and a PD in one receiving terminal (smart device or the like) in the case of the configuration of (LiFi / OCC Hybrid) , And a smartphone can be configured as a front camera / PD pair and a rear camera / PD pair.

The camera / PD pair can be configured as a separate camera and a high-speed PD, or as a non-used cell of the image sensor of the camera (PD of the image sensor is the same as PD).

The camera and the PD can simultaneously receive data, and at the same time, receive data can be used for each purpose.

According to any one of the embodiments of the present invention, it is possible to transmit a high-speed data through one receiving device 200 without having to separately provide the receiving device 200 according to the transmission rate according to visible light communication of the transmitting device 100, And low-speed data can be received.

Further, the use of the camera by the data receiving unit 212 has an effect of enabling linking of position recognition, object tracking, and the like.

Meanwhile, the visible light communication method according to an embodiment of the present invention can also be realized in the form of a recording medium including a computer program stored in a medium executed by the computer or an instruction executable by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: transmitting device
200: receiving device
110: Display
210: Fusion data receiver
211: first data receiving section
212: second data receiving section
120, 220: memory
130, 230: Processor

Claims (9)

A smart device capable of simultaneously receiving LiFi-based high-speed visible light communication and OCC (Optical Camera Communication) -based low-speed visible light communication,
A convergence data receiver for receiving data at different transmission rates through the visible light communication,
A memory for storing a program for receiving data through the visible light communication;
And a processor for executing a program stored in the memory,
The processor executes the program to measure the transmission rate of the transmission data transmitted by the transmission device and to set the reception rate of the fusion data reception unit based on the measured transmission rate to receive the transmission data Receiving device. The method according to claim 1,
Wherein the fusion data receiving unit comprises:
A first data receiving unit for receiving transmission data at a speed higher than a predetermined threshold value through the visible light communication;
And a second data receiving unit for receiving transmission data at a speed lower than the predetermined threshold value through the visible light communication. 3. The method of claim 2,
Wherein the processor compares the measured transmission rate with the preset threshold value and selects one of the first and second data receiving units based on the comparison result and selects either one of the selected first and second data receiving units And receives the transmission data in one. The method of claim 3,
Wherein the first data receiving unit is a photodiode, the second data receiving unit is a camera,
Wherein the first data receiving unit and the second data receiving unit are each configured to include at least one photodiode and a camera. 5. The method of claim 4,
And the second data receiving unit receives the transmission data based on a rolling shutter scheme. The method of claim 3,
When the transmitting device divides the visible light signal including the transmission data into a plurality of frames per second and outputs the divided frames,
Wherein the processor compares the plurality of frames per second with the predetermined threshold to receive the transmission data based on at least one of the first and second data receivers. A visible light communication method capable of receiving high-speed and low-speed data in a receiving device,
Measuring a transmission rate of the transmission data transmitted through a visible light communication at a transmitting device;
Comparing the measured transmission rate with the predetermined threshold value;
Selecting one of the first and second data receiving units to receive the transmission data based on the comparison result;
Receiving the transmission data from the selected one of the first and second data receiving units,
Wherein the first and second data receiving units have different reception speeds. 8. The method of claim 7,
Wherein the first data receiving unit is a photodiode, and the second data receiving unit is a camera. 9. The method of claim 8,
And the second data receiving unit receives the transmission data based on a rolling shutter system.

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