Uplink Transmit Power Control Method, Communication Terminal Unit, Base Station Unit, And Mobile Communication System

An uplink transmit power control method for use in a mobile communication system in which a modulation and coding scheme is selected in accordance with reception quality information that a communication terminal unit as a mobile station unit periodically reports to a base station unit, the method comprising the steps of:

• a first base station unit detecting an interference level and terminal identification information identifying a communication terminal unit that is causing interference greater than a predetermined reference value to said first base station unit;
• said first base station unit transmitting, to said communication terminal unit, control information indicating said interference level and also indicating that said communication terminal unit is causing interference;
• said communication terminal unit receiving said control information;
• said communication terminal unit reducing transmit power in accordance with said interference level indicated by said control information, and adjusting reception quality information in such a direction as to reduce quality;
• and
• said first base station unit transmitting to all neighboring base stations notification information notifying that said control information has been transmitted to said communication terminal unit.

A mobile communication system in which a modulation and coding scheme is selected in accordance with reception quality information that a communication terminal unit as a mobile station unit periodically reports to a base station unit, wherein

• a first base station unit comprises:
• means for detecting an interference level and terminal identification information identifying a communication terminal unit that is causing interference greater than a predetermined reference value to said first base station unit;
• and
• means for transmitting said interference level and said terminal identification information together as interference information to all neighboring base stations,
• and a second base station unit comprises:
• means for receiving said interference information and for recognizing, based on said terminal identification information, that said communication terminal unit is currently under the control of said second base station unit;
• and
• means for transmitting, to said communication terminal unit, control information indicating said interference level and also indicating that said communication terminal unit is causing interference, and wherein
• said communication terminal unit comprises:
• means for receiving said control information;
• and
• means for reducing transmit power in accordance with said interference level indicated by said control information, and for adjusting reception quality information in such a direction as to reduce quality.

A mobile communication system in which a modulation and coding scheme is selected in accordance with reception quality information that a communication terminal unit as a mobile station unit periodically reports to a base station unit, wherein

• a first base station unit comprises:
• means for detecting an interference level and terminal identification information identifying a communication terminal unit that is causing interference greater than a predetermined reference value to said first base station unit;
• and
• means for transmitting, to said communication terminal unit, control information indicating said interference level and also indicating that said communication terminal unit is causing interference, and wherein
• said communication terminal unit comprises:
• means for receiving said control information;
• and
• means for reducing transmit power in accordance with said interference level indicated by said control information, and for adjusting reception quality information in such a direction as to reduce quality, and
• said first base station unit further comprises:
• means for transmitting to all neighboring base stations notification information notifying that said control information has been transmitted to said communication terminal unit.

A base station unit for use in a mobile communication system in which a modulation and coding scheme is selected in accordance with reception quality information that a communication terminal unit as a mobile station unit periodically reports to said base station unit, wherein

• said base station unit as a first base station unit comprises:
• means for detecting an interference level and terminal identification information identifying a communication terminal unit that is causing interference greater than a predetermined reference value to said first base station unit;
• and
• means for transmitting said interference level and said terminal identification information together as interference information to all neighboring base stations,
• and said base station unit as a second base station unit comprises:
• means for receiving said interference information and for recognizing, based on said terminal identification information, that said communication terminal unit is currently under the control of said second base station unit;
• and
• means for transmitting, to said communication terminal unit, control information indicating said interference level and also indicating that said communication terminal unit is causing interference.

A base station unit for use in a mobile communication system in which a modulation and coding scheme is selected in accordance with reception quality information that a communication terminal unit as a mobile station unit periodically reports to said base station unit, comprising:

• means for detecting an interference level and terminal identification information identifying a communication terminal unit that is causing interference greater than a predetermined reference value to said base station unit;
• means for transmitting, to said communication terminal unit, control information indicating said interference level and also indicating that said communication terminal unit is causing interference;
• and
• means for transmitting to all neighboring base stations notification information notifying that said control information has been transmitted to said communication terminal unit.