Apparatus and method for providing synchronized data by using visible light communication

• US 8,995,840 B2
• Filed: 01/10/2011
• Issued: 03/31/2015
• Est. Priority Date: 01/08/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shin, Hong-Seok, Jung, Dae-Kwang, Choi, Jeong-Seok, Lee, Kyung-Woo, Park, Sung-Bum, Song, Ki-Uk
• Primary Examiner(s): Wolf, Darren E
• Application Number:
  US12/987,479
• Publication Number:
  US 20110170872A1
• Time in Patent Office: 1,541 Days
• US Class Current: 398/118
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04L 7/0075 with photonic or optical means

Abstract

An apparatus and a method for providing synchronized data by using visible light communication includes, receiving a synchronization channel from a mobile communication base station using a specific mobile communication network, by a Light Emitting Diode (LED) lighting; analyzing the received synchronization channel, and extracting a synchronization signal for synchronizing the LED lighting with at least one LED lighting adjacent to the LED lighting; selecting a specific time slot of the synchronization signal based on IDentifications (IDs) of the LED lightings; and including a data frame of the LED lighting in the specific time slot, and transmitting the specific time slot, which includes the data frame of the LED lighting, to a mobile terminal.

Claims

1. A method for providing synchronized data by using visible light communication, the method:

receiving a synchronization channel from a mobile communication network, by a first Light Emitting Diode (LED) lighting apparatus;

analyzing the received synchronization channel, and extracting a synchronization signal for synchronizing the first LED lighting apparatus with at least one second LED lighting apparatus adjacent to the first LED lighting apparatus;

synchronizing transmission of light as illumination and of light as data by the first LED lighting apparatus with the extracted synchronization signal, whereby the transmission is synchronized in time slots;

selecting a time slot for the first LED lighting apparatus to transmit a data frame based on an Identification (ID) of the first LED lighting apparatus so as to not overlap with any time slot in which the at least one second LED lighting apparatus transmits a data frame; and

transmitting the data frame of the first LED lighting apparatus in the time slot to a mobile terminal,

wherein receiving the synchronization channel comprises;

determining if synchronization channels have been received from more than one base station in the mobile communication network; and

selecting, if synchronization channels have been received from more than one base station in the mobile communication network, a synchronization channel having the strongest signal intensity.

2. The method as claimed in claim 1, wherein the mobile communication network periodically transmits the synchronization channel used for synchronization with the mobile terminal to the first LED lighting apparatus.

3. The method as claimed in claim 1, wherein the first LED lighting apparatus and the at least one second LED lighting apparatus adjacent to the first LED lighting apparatus are included in a single lighting group, and each LED lighting apparatus has a different ID.

4. The method as claimed in claim 3, wherein the at least one adjacent second LED lighting apparatus selects a time slot for transmitting a data frame based on the at least one second LED lighting apparatus unique ID.

5. The method as claimed in claim 1, wherein the first LED lighting apparatus transmits a visible light frame as illumination in a time slot other than the time slot in which the data frame is transmitted.

6. An LED lighting apparatus for providing synchronized data by using visible light communication, comprising:

a mobile communication receptor configured to receive a synchronization channel from a mobile communication network, to analyze the received synchronization channel, and to extract a synchronization signal for synchronizing a first LED lighting apparatus with at least one second LED lighting apparatus adjacent to the first LED lighting apparatus;

an information processing controller configured to set the extracted synchronization signal to synchronize time slots for transmitting light as illumination and light as data, to select a time slot for the first LED lighting apparatus to transmit a data frame based on an Identification (ID) of the first LED lighting apparatus so as to not overlap with any time slot in which the at least one second LED lighting apparatus transmits a data frame, and to generate the data frame of the first LED lighting apparatus, which is transmitted in the time slot; and

an LED driving circuit configured to transmit the data frame to a mobile terminal,

where the mobile communication receptor is further configured to determine if synchronization channels have been received from more than one base station in the mobile communication network, and to select, if synchronization channels have been received from more than one base station in the mobile communication network, a synchronization channel having the strongest signal intensity.

7. The LED lighting apparatus as claimed in claim 6, wherein the mobile communication receptor comprises:

a Radio Frequency (RF) antenna for receiving the synchronization channel from the mobile communication network; and

a Code Division Multiple Access (CDMA) decoder for decoding the received synchronization channel, and extracting the synchronization signal.

8. The LED lighting apparatus as claimed in claim 6, wherein the mobile communication receptor periodically receives the synchronization channel from the mobile communication network.

9. The LED lighting apparatus as claimed in claim 6, wherein the first LED lighting apparatus and the at least one second LED lighting apparatus adjacent to the first LED lighting apparatus are included in a single lighting group, and each LED lighting apparatus has a different ID.

10. The LED lighting apparatus as claimed in claim 9, wherein the at least one adjacent second LED lighting apparatus selects a time slot for transmitting a data frame based on the at least one adjacent second LED lighting apparatus unique ID.

11. The LED lighting apparatus as claimed in claim 6, wherein the first LED lighting apparatus transmits a visible light frame as illumination in a time slot other than the time slot in which the data frame is transmitted.

12. A method for a Light Emitting Diode (LED) lighting apparatus to transmit light as illumination and light as data in synchronized time slots, the method comprising:

receiving a synchronization signal from a mobile communication network;

using the synchronization signal to synchronize time slots for the transmission of light as illumination and light as data;

selecting, a time slot for the LED lighting apparatus to transmit a data frame based on an identification of the LED lighting apparatus so that the selected time slot does not overlap with any time slot in which any other adjacent LED lighting apparatus transmits a data frame; and

transmitting the data frame in the selected time slot,

wherein receiving a synchronization signal comprises;

determining if synchronization signals have been received from more than one base station in the mobile communication network; and

selecting, if synchronization signals have been received from more than one base station in the mobile communication network, a synchronization signal having the strongest signal intensity.

13. The method of claim 12, wherein the LED lighting apparatus transmits light as illumination and light as data in different synchronized time slots.

14. The method of claim 12, wherein the LED lighting apparatus transmits light as illumination and light as data in the same synchronized time slot, and the selected time slot is used for transmitting both light as illumination and light as the data frame.

15. The method of claim 12, wherein the LED lighting apparatus is one of a group of LED lighting apparatuses, and each LED lighting apparatus in the group has a unique identification.

16. The method of claim 12, wherein the synchronization signal is a Wide-band Code Division Multiple Access (WCDMA) synchronization channel.

17. The method of claim 12, further comprising:

determining if a synchronization signal has been received from the mobile communication network; and

if no synchronization signal has been received from the mobile communication network, randomly selecting a time slot for the transmission of the data frame.