Light-based communication transmission protocol

• US 9,780,873 B2
• Filed: 12/16/2014
• Issued: 10/03/2017
• Est. Priority Date: 03/25/2014
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Breuer, Christian, Aggarwal, Anant, Siessegger, Bernhard
• Primary Examiner(s): Payne, David
• Assistant Examiner(s): Ismail, Omar S
• Application Number:
  US14/572,179
• Publication Number:
  US 20150280819A1
• Time in Patent Office: 1,022 Days
• CPC Class Codes: G01C 21/206 specially adapted for indoor navigation
• CPC Class Codes: G01C 3/08 Use of electric radiation detectors
• CPC Class Codes: G01S 1/7032 Transmitters
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 5/163 Determination of attitude using inertial means G01C9/00; control of attitude G05D1/49
• CPC Class Codes: G06F 18/23 Clustering techniques
• CPC Class Codes: G06T 2207/10004 Still image; Photographic image
• CPC Class Codes: G06T 2207/20021 Dividing image into blocks, subimages or windows
• CPC Class Codes: G06T 7/90 Determination of colour characteristics
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/114 Indoor or close-range type systems
• 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: H04B 10/501 Structural aspects
• CPC Class Codes: H04B 10/502 LED transmitters
• CPC Class Codes: H04B 10/516 Details of coding or modulation
• CPC Class Codes: H04B 10/5563 Digital frequency modulation
• CPC Class Codes: H04J 14/086 Medium access H04J3/16 takes precedence
• CPC Class Codes: H04J 3/10 Arrangements for reducing cross-talk between channels
• CPC Class Codes: H04N 25/531 by controlling rolling shutters in CMOS SSIS

Abstract

Techniques are disclosed for providing light-based communication (LCom) between a receiver device and one or more transmitting LCom-enabled luminaires. In accordance with some embodiments, LCom data to be transmitted may be allocated over multiple colors of light output by multiple LCom-enabled luminaires and transmitted in parallel across the multiple colors of light using a time division multiple access (TDMA) scheme. In some cases, the disclosed techniques can be used, for example, to allow for multiple LCom-enabled luminaires to communicate simultaneously over multiple active LCom channels with a single receiver device. In some instances, the disclosed techniques may be used, for example, to provide channel redundancy that facilitates successful completion of LCom data transmission when an LCom channel is broken. In some instances, the disclosed techniques may be used, for example, to provide more accurate positioning for indoor navigation.

Claims

1. A system comprising:

a plurality of solid-state luminaires, including;

a first solid-state luminaire configured to emit a first pulsing light signal encoded with first data via a first color of light and a second pulsing light signal encoded with second data via a second color of light; and

a second solid-state luminaire neighboring the first solid-state luminaire and configured to emit the first pulsing light signal encoded with the first data via the first color of light and the second pulsing light signal encoded with the second data via the second color of light; and

at least one controller configured to control light emitted by the plurality of solid-state luminaires such that neighboring solid-state luminaires in the plurality of luminaires emit light of different colors at the same time,

wherein the first data encoded in the first pulsing light signal and the second data encoded in the second pulsing light signal are transmitted to a receiver, and the receiver is able to separate the first data and the second data.

2. The system of claim 1, wherein the at least one controller is configured to control light emitted by the first and second solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA).

3. The system of claim 1, wherein the first and second solid-state luminaires are configured for dual-white light emissions.

4. The system of claim 1, wherein:

the first solid-state luminaire is further configured to emit a third pulsing light signal encoded with third data via a third color of light;

the second solid-state luminaire is further configured to emit the third pulsing light signal encoded with the third data via the third color of light; and

the plurality of solid state luminaires further includes a third solid-state luminaire neighboring the second solid-state luminaire and configured to emit the first pulsing light signal encoded with the first data via the first color of light, the second pulsing light signal encoded with the second data via the second color of light, and the third pulsing light signal encoded with the third data via the third color of light.

5. The system of claim 4, wherein the first, second, and third solid-state luminaires are configured for red-green-blue (RGB) light emissions.

6. The system of claim 4, wherein the at least one controller is configured to control light emitted by the first, second, and third solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA) in a round-robin fashion.

7. The system of claim 1, the system further comprising:

a computing device comprising the receiver.

8. A method of light-based communication comprising:

transmitting, by a first solid-state luminaire in a plurality of solid-state luminaires, a first pulsing light signal encoded with first data via a first color of light at a first time;

transmitting, by a second solid-state luminaire in a plurality of solid-state luminaires, a second pulsing light signal encoded with second data via a second color of light at the first time;

transmitting, by the first solid-state luminaire, the second pulsing light signal encoded with the second data via the second color of light at a second time; and

transmitting, by the second solid-state luminaire, the first pulsing light signal encoded with the first data via the first color of light at the second time,

wherein;

the second solid-state luminaire neighbors the first solid-state luminaire;

neighboring solid-state luminaires in the plurality of luminaires are controlled to emit light of different colors at the same time, including at the first time; and

the first data encoded in the first pulsing light signal and the second data encoded in the second pulsing light signal are transmitted to a receiver, and the receiver is able to separate the first data and the second data.

9. The method of claim 8, wherein the first and second solid-state luminaires are configured for dual-white light emissions.

10. The method of claim 8, wherein the first pulsing light signal encoded with the first data and the second pulsing light signal encoded with the second data are emitted by the first and second solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA).

11. The method of claim 8, the method further comprising:

transmitting, by a third solid-state luminaire in the plurality of solid-state luminaires, a third pulsing light signal encoded with third data via a third color of light at the first time, wherein the third solid-state luminaire neighbors the second solid-state luminaire.

12. The method of claim 11, the method further comprising:

transmitting, by the first solid-state luminaire, the second pulsing light signal encoded with the second data via the second color of light at a second time;

transmitting, by the second solid-state luminaire, the third pulsing light signal encoded with the third data via the third color of light at the second time;

transmitting, by the third solid-state luminaire, the first pulsing light signal encoded with the first data via the first color of light at the second time;

transmitting, by the first solid-state luminaire, the third pulsing light signal encoded with the third data via the third color of light at a third time;

transmitting, by the second solid-state luminaire, the first pulsing light signal encoded with the first data via the first color of light at the third time; and

transmitting, by the third solid-state luminaire, the second pulsing light signal encoded with the second data via the second color of light at the third time.

13. The method of claim 11, wherein the first, second, and third solid-state luminaires are configured for red-green-blue (RGB) light emissions.

14. The method of claim 11, wherein the first, second, and third pulsing light signals encoded with the first, second, and third data respectively are emitted by the first, second, and third solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA) in a round-robin fashion.

15. A non-transitory computer program product encoded with instructions that, when executed by one or more processors, causes a process to be carried out, the process comprising:

transmitting a first pulsing light signal encoded with first data via a first color of light emitted by a first solid-state luminaire at a first time;

transmitting a second pulsing light signal encoded with second data via a second color of light emitted by a second solid-state luminaire at the first time;

transmitting the second pulsing light signal encoded with the second data via the second color of light emitted by the first solid-state luminaire at a second time; and

transmitting the first pulsing light signal encoded with the first data via the first color of light emitted by the second solid-state luminaire at the second time,

wherein;

the second solid-state luminaire neighbors the first solid-state luminaire in a plurality of solid-state luminaires;

neighboring solid-state luminaires in the plurality of luminaires are controlled to emit light of different colors at the same time, including at the first time; and

the first data encoded in the first pulsing light signal and the second data encoded in the second pulsing light signal are transmitted to a receiver, and the receiver is able to separate the first data and the second data.

16. The non-transitory computer program product of claim 15,

wherein the first pulsing light signals encoded with the first data and the second pulsing light signal encoded with the second data are emitted by the first and second solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA).

17. The non-transitory computer program product of claim 15, the process further comprising:

transmitting a third pulsing light signal encoded with the third data via a third color of light emitted by a third solid-state luminaire at the first time;

transmitting the second pulsing light signal encoded with the second data via the second color of light emitted by the first solid-state luminaire at a second time;

transmitting the third pulsing light signal encoded with the third data via the third color of light emitted by the second solid-state luminaire at the second time;

transmitting the first pulsing light signal encoded with the first data via the first color of light emitted by the third solid-state luminaire at the second time;

transmitting the third pulsing light signal encoded with the third data via the third color of light emitted by the first solid-state luminaire at a third time;

transmitting the first pulsing light signal encoded with the first data via the first color of light emitted by the second solid-state luminaire at the third time; and

transmitting the second pulsing light signal encoded with the second data via the second color of light emitted by the third solid-state luminaire at the third time;

wherein the first, second, and third pulsing light signals encoded with the first, second, and third data respectively are emitted by the first, second, and third solid-state luminaires such that independent data packets are transmitted in a sequential manner via time division multiple access (TDMA) in a round-robin fashion.