Device implementing visible light communications and wireless network communications in dual mode and method of implementing thereof
Disclosed herein are a dual-mode device operating in a visible light communications mode and a wireless network communications mode, and a method performed by the device. The visible light communications device includes a wireless network communications unit including a fixed identifier and performing communications based on a wireless protocol, a visible light transmitting unit transmitting the fixed identifier using a visible light communications protocol, and a controller (control unit) controlling the visible light transmitting unit so that it selectively transmits the fixed identifier using the visible light communications protocol depending on whether the wireless network communications unit is connected to a wireless network.
1. A visible light communications device comprising:
a wireless network communications unit that performs communications by using a wireless protocol, wherein the wireless network communications unit to provide a fixed identifier;
a visible light transmitting unit that transmits the fixed identifier using a visible light communications protocol; and
a controller that controls the visible light transmitting unit such that the visible light transmitting unit selectively transmits the fixed identifier, using the visible light communications protocol, based on whether the wireless network communications unit is connected to a first wireless network,
wherein the visible light transmitting unit transmits the fixed identifier at a first interval when the wireless network communications unit is not connected to the first wireless network,
the visible light transmitting unit transmits the fixed identifier at a second interval when the wireless network communications unit is connected to the first wireless network, and
the first interval is shorter than the second interval.
2. The visible light communications device of claim 1 , wherein the fixed identifier includes a media access control (MAC) address of the wireless network communications unit or the controller.
3. The visible light communications device of claim 1 , wherein when the wireless network communications unit receives a first message requesting to join the first wireless network, the wireless network communications unit then transmits the fixed identifier to a wireless network controller such that the wireless network communications unit connects to the first wireless network, and
the controller of the visible light communications device controls the visible light transmitting unit such that the visible light transmitting unit transmits the fixed identifier at the second interval.
4. The visible light communications device of claim 1 , wherein when the wireless network communications unit is determined to be disconnected from the first wireless network, the controller controls the visible light transmitting unit such that the visible light transmitting unit transmits the fixed identifier at the first interval until the wireless network communications unit is connected to a second wireless network.
5. The visible light communications device of claim 1 , wherein the wireless network communications unit transmits signals using Zigbee communications protocol, and the wireless network communications unit receives signals using Zigbee communications protocol, and
wherein the first wireless network is a Zigbee network that uses Zigbee communications protocol.
6. The visible light communications device of claim 1 , wherein the wireless network communications unit transmits signals using Bluetooth communications protocol, and the wireless network communications unit receives signals using Bluetooth communications protocol, and
wherein the first wireless network is a Bluetooth network that uses Bluetooth communications protocol.
7. The visible light communications device of claim 1 , wherein the visible light communications device is a luminaire, and the visible light transmitting unit is integrally coupled to a light emitting device of the luminaire, and
wherein the controller separates operation of the visible light transmitting unit based on cycle,
the controller controls the visible light transmitting unit such that the visible light transmitting unit transmits the fixed identifier during a visible light communications (VLC) transmission period of the cycle, and
wherein a length of the VLC transmission period varies depending on a length of the fixed identifier.
8. The visible light communications device of claim 7 , wherein the cycle includes the VLC transmission period and a dimming period when the wireless network communications unit is not connected to the first wireless network, and
wherein the cycle includes only the dimming period, and without the VLC transmission period, when the wireless network communications unit is connected to the first wireless network.
9. The visible light communications device of claim 7 , wherein the controller randomly sets the VLC transmission period in the cycle.