Time Synchronization of Lighting Services

Patent metadata

Field	Value
Publication number	US-2016165703-A1
Application number	US-201414563403-A
Country	US
Kind code	A1
Filing date	Dec 8, 2014
Priority date	Dec 8, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

Techniques presented herein are directed to synchronizing the execution time of lighting operations within a networked lighting system. In one example, a network device that is connected to at least one networked light fixture accepts one or more timing reference messages representing a network time base. The network device generates one or more lighting control messages that identify at least one light control setting for the networked light fixture connected to the network device. Based on the one or more timing reference messages, the network device encodes a time for execution of the light control setting within the lighting control messages, thereby generating one or more time encoded lighting control messages. The network device sends the time encoded lighting control messages to the networked light fixture for execution of the light control settings at the time of execution specified in the time encoded lighting control message.

First claim

What is claimed is:

1 . A method comprising:
accepting, at a network device connected to at least one networked light fixture, one or more timing reference messages representing a network time base; generating one or more lighting control messages identifying at least one light control setting for the networked light fixture connected to the network device; based on the one or more timing reference messages representing the network time base, encoding, in the lighting control messages, a time for execution of the at least one light control setting to generate one or more time encoded lighting control messages; and sending the time encoded lighting control messages to the networked light fixture for execution of the at least one light control setting at the time of execution specified in the time encoded lighting control message.

2 . The method of claim 1 , further comprising:
synchronizing, based on the one or more timing reference messages, a local clock at the network device to the network time base.

3 . The method of claim 1 , wherein the networked light fixture comprises a local processor and a plurality of light emitters.

4 . The method of claim 1 , wherein the networked light fixture comprises a local fixture clock, and further comprising:
sending one or more supplementary timing reference messages from the network device to the networked light fixture for use by the networked light fixture to synchronize the local fixture clock to the network time base.

5 . The method of claim 1 , further comprising:
buffering the time encoded lighting control messages at the networked light fixture until the time of execution specified in the time encoded lighting control message.

6 . The method of claim 1 , wherein the network time base is a time of time-of-day server connected to a lighting management system in communication with the network device, and wherein accepting the one or more timing reference messages comprises:
receiving timing reference messages from the lighting management system.

7 . The method of claim 1 , wherein sending the time encoded lighting control messages to the networked light fixture comprises:
sending the time encoded lighting control messages via Power over Ethernet (PoE).

8 . The method of claim 1 , wherein the time for execution of the at least one light control setting is a future time.

9 . The method of claim 1 , wherein the time for execution of the at least one light control setting is set to zero or a past time such that the networked light fixture executes the at least one light control setting immediately.

10 . An apparatus, comprising:
one or more network interface devices connected to at least one networked light fixture; a memory; and a processor that:
accepts one or more timing reference messages representing a network time base,
generates one or more lighting control messages identifying at least one light control setting for the networked light fixture,
based on the one or more timing reference messages representing the network time base, encodes, in the lighting control messages, a time for execution of the at least one light control setting to generate one or more time encoded lighting control messages, and
sends the time encoded lighting control messages to the networked light fixture for execution of the at least one light control setting at the time of execution specified in the time encoded lighting control message.

11 . The apparatus of claim 10 , wherein the processor:
synchronizes, based on the one or more timing reference messages, a local clock to the network time base.

12 . The apparatus of claim 10 , wherein the networked light fixture comprises a local processor and a plurality of light emitters.

13 . The apparatus of claim 10 , wherein the networked light fixture comprises a local fixture clock, and wherein the processor:
sends one or more supplementary timing reference messages to the networked light fixture for use by the networked light fixture to synchronize the local fixture clock to the network time base.

14 . The apparatus of claim 10 , wherein the networked light fixture buffers the time encoded lighting control messages until the time of execution specified in the time encoded lighting control message.

15 . The apparatus of claim 10 , wherein the network time base is a time of time-of-day server connected to a lighting management system, and wherein to accept the one or more timing reference messages, the processor:
receives timing reference messages from the lighting management system.

16 . The apparatus of claim 10 , wherein to send the time encoded lighting control messages to the networked light fixture, the processor:
sends the time encoded lighting control messages via Power over Ethernet (PoE).

17 . The apparatus of claim 10 , wherein the time for execution of the at least one light control setting is a future time.

18 . The apparatus of claim 10 , wherein the time for execution of the at least one light control setting is set to zero or a past time such that the networked light fixture executes the at least one light control setting immediately.

19 . One or more computer readable storage media encoded with software comprising computer executable instructions and when the software is executed operable to:
accept, at a network device connected to at least one networked light fixture, one or more timing reference messages representing a network time base; generate one or more lighting control messages identifying at least one light control setting for the networked light fixture connected to the network device; based on the one or more timing reference messages representing the network time base, encode, in the lighting control messages, a time for execution of the at least one light control setting to generate one or more time encoded lighting control messages; and send the time encoded lighting control messages to the networked light fixture for execution of the at least one light control setting at the time of execution specified in the time encoded lighting control message.

20 . The computer readable storage media of claim 19 , further comprising instructions operable to:
synchronize, based on the one or more timing reference messages, a local clock at the network device to the network time base.

21 . The computer readable storage media of claim 19 , wherein the networked light fixture comprises a local processor and a plurality of light emitters.

22 . The computer readable storage media of claim 19 , wherein the networked light fixture comprises a local fixture clock, and further comprising instructions operable to:
send one or more supplementary timing reference messages from the network device to the networked light fixture for use by the networked light fixture to synchronize the local fixture clock to the network time base.

23 . The computer readable storage media of claim 19 , further comprising instructions operable to:
buffer the time encoded lighting control messages at the networked light fixture until the time of execution specified in the time encoded lighting control message.

24 . The computer readable storage media of claim 19 , wherein the network time base is a time of time-of-day server connected to a lighting management system in communication with the network device, and wherein the instructions operable to accept the one or more timing reference messages comp

Assignees

• Cisco Tech Inc

Inventors

• Laherty Matthew A
• Schriner Donald
• Byers Charles Calvin

Classifications

• H05B47/155

  Coordinated control of two or more light sources · CPC title

• H05B45/00 Primary

  Circuit arrangements for operating light-emitting diodes [LED] · CPC title

• H05B47/187

  using power over ethernet [PoE] supplies · CPC title

• H05B33/0815

  Electricity · mapped topic

• H05B37/0281 Primary

  Electricity · mapped topic