Method for setting power control initial value using indication light in visible light communications and transmission/receive apparatus using the same

A method for setting a power control initial value by using an indication light in visible light communications, the method comprising the steps of:

• radiating a plurality of indication lights as candidate values, each having a power level different from the others by a visible light communication transmitter;
• receiving a particular candidate value having a adequate power level from a visible light communication receiver;
• transmitting data from the visible light communication transmitter to the visible light communication receiver by using a transmitted power initial value according to the received adequate power level;
• and
• classifying the respective power levels of the indication light radiated from the visible light communication transmitter by the visible light communication transmitter performing the steps of:
• associating a unique IDentification (ID) with each power level of the indication light;
• modulating the unique ID;
• and
• transmitting the modulated unique ID.

A method for setting a power control initial value of a visible light receiver by using an indication light in visible light communications, the method comprising the steps of:

• receiving a plurality of indication lights as candidate values, by the visible light receiver, each one of the plurality of indication lights having a power level different from the others;
• on detecting, by the visible light communication receiver, at least one indication light of the plurality of indication lights, determining whether a communication position has been aligned while simultaneously measuring a Received Signal Strength Indication (RSSI) of the at least one detected indication light;
• selecting a power level as a particular candidate value whose measured RSSI is in a preset threshold range and which is determined to be adequate for transmission/reception among the multiple power levels different from one another by a visible light communication receiver;
• informing a visible light communication transmitter of a particular candidate value having the determined adequate power level;
• receiving data from the visible light communication transmitter by using a transmitted power initial value according to the particular candidate value having the determined adequate power level;
• and
• wherein a plurality of indication lights are radiated in the form of an increase and a decrease from the visible light communication transmitter, the plurality of indication lights for measuring the respective power levels of each of the indication lights by the visible light communication receiver.