Mobile communication network system, portable communication terminal, and authentication device, and driving method

A mobile terminal comprising:

• a light receiving circuit which receives a visible-light signal, said visible-light signal having a pattern of colors, said color pattern being emitted repeatedly for a predetermined number of times, wherein a period of said color pattern is gradually increased with an each color pattern iteration;
• a controller which has a predetermined sampling frequency and detects said color pattern of colors, said color pattern having a period suitable for said predetermined sampling frequency.

An authentication device comprising:

• a light emitting circuit which emits a visible-light signal, said visible-light signal having a pattern of colors and said color pattern being repeatedly emitted for a predetermined number of times;
• a controller which controls said light emitting circuit and gradually increases a period of said color pattern with an each color pattern iteration.

An authentication device comprising:

• a light receiving circuit which receives a visible-light signal, said visible-light signal having a pattern of colors, said color pattern being emitted repeatedly for a predetermined number of times, wherein a period of said color pattern is gradually increased with an each color pattern iteration;
• a controller which has a predetermined sampling frequency and detects said color pattern, said color pattern having a period suitable for said predetermined sampling frequency.

A communication method of a mobile station comprising:

• emitting a visible-light signal, said visible-light signal having a pattern of colors;
• repeating said emitting process for a predetermined number of times;
• gradually increasing a period of said color pattern with an each color pattern iteration.

A communication method of a mobile station comprising:

• receiving a visible-light signal, said visible-light signal having a pattern of colors, said color pattern being emitted repeatedly for a predetermined number of times, wherein a period of said color pattern is gradually increased with an each color pattern iteration;
• sampling said received visible-light signal by a predetermined sampling frequency;
• detecting said color pattern of colors whose period is suitable for said predetermined sampling frequency.

A communication method of an authentication device comprising:

• emitting a visible-light signal, said visible-light signal having a pattern of colors;
• repeating said emitting process for a predetermined number of times;
• gradually increasing a period of said color pattern with an each color pattern iteration.

A communication method of an authentication device comprising:

• receiving a visible-light signal, said visible-light signal having a pattern of colors, said color pattern being emitted repeatedly for a predetermined number of times, a period of said color pattern being gradually increased with an each color pattern-iteration;
• sampling said received visible-light signal by a predetermined sampling frequency;
• detecting said color pattern of colors whose period being suitable for said predetermined sampling frequency.