Wireless communication base station having dynamic cell structure

A wireless communication base station comprising:

• a plurality of radio units configured to transmit and receive a radio signal;
• and
• a digital unit connected to the plurality of radio units via cables and configured to operate a communication protocol,
• wherein the digital unit controls the plurality of radio units according to a communication environment to be switched into a merge state in which the plurality of radio units forms a cell, or an independent state in which the plurality of radio units forms different cells, respectively,
• wherein the digital unit has no function of radio communication,
• wherein the digital unit calculates a channel quality based on a channel quality indicator indicating a quality of a downlink channel or information associated with a quality of an uplink channel and controls the plurality of radio units according to the calculated channel quality;
• wherein when the plurality of radio units is at the independent state and a channel quality is below a first critical value, the digital unit controls the plurality of radio units to keep the independent state.