Abstract: A control unit for a wireless terminal includes a power amplification request/modulation method reception unit which receives uplink communication channel power amplification requests transmitted from a wireless base station connected to the wireless terminal, a power reduction request reception unit which receives uplink communication channel power reduction requests transmitted from a wireless base station not connected to the wireless terminal, and a modulation class setting unit which, when a power amplification request is received by the power amplification request/modulation method request reception unit and a power reduction request is received by the power reduction request reception unit, sets the modulation class to a modulation class which has less transmission power than prior to the setting and that has a modulation method for which the communication quality of the aforementioned uplink communication channel is at or above a required level.

Abstract: For each resource block assigned to radio terminal (2A), radio base station (1A) measures the amount of interference the resource blocks receive from the communication from radio terminal (2B) to radio base station (1B) and the communication from radio terminal (2C) to radio base station (1C). Further, radio base station (1A) sends a command to lower the transmission power when the amount of interference continuously exceeds a threshold value for the duration of a first time period or more, and sends the amount of interference when the amount of interference continuously exceeds a threshold value for the duration of a second time period or more (second time period<first time period).

Abstract: Radio base stations (2B, 2C), to which a radio terminal (1A) is not connected, transmit their respective interference level notifications to the radio terminal (1A). The radio terminal (1A) transmits the received interference level notifications to a radio base station (2A) to which the radio terminal (1A) is connected. The radio base station (2A) appropriately changes, in accordance with the received interference level notifications, the frequency, transmission power and modulation scheme of the uplink communication channel allocated to the radio terminal (1A).

Abstract: A control unit for a wireless terminal includes a power amplification request/modulation method reception unit which receives uplink communication channel power amplification requests transmitted from a wireless base station connected to the wireless terminal, a power reduction request reception unit which receives uplink communication channel power reduction requests transmitted from a wireless base station not connected to the wireless terminal connected, and a modulation class setting unit which, when a power amplification request is received by the power amplification request/modulation method request reception unit and a power reduction request is received by the power reduction request reception unit, sets the modulation class, to a modulation class which has less transmission power than prior to the setting and that has a modulation method for which the communication quality of the aforementioned uplink communication channel is at or above a required level.