Radio communication system, base station apparatus, base station control apparatus, method of controlling transmission power of base station, and computer readable medium

A base station apparatus comprising:

• a radio communication unit that performs radio communication with at least one mobile station;
• and
• a control unit that controls transmission power of the radio communication unit,
• wherein the control unit controls transmission power of a downlink radio signal transmitted by the radio communication unit, based on a calculated difference between the reception quality of the downlink radio signal and the reception quality of a peripheral cell downlink radio signal, measured by the at least one mobile station, so that a reception quality of the downlink radio signal exceeds a second predetermined value of reception quality at a position of the at least one radio terminal at which a reception quality of the peripheral cell downlink radio signal is lower than a first predetermined value of reception quality based on a measurement value of the reception quality of the peripheral cell downlink radio signal by the at least one mobile station, and
• the control unit controls the transmission power of the downlink radio signal based on the calculated difference calculated at least one position of the mobile station at which the reception quality of the peripheral cell downlink radio signal exceeds the first predetermined value and the reception quality of the downlink radio signal exceeds the reception quality of the peripheral cell downlink radio signal, and the control unit controls the transmission power of the downlink radio signal to decrease the transmission power of the downlink radio signal according to the calculated difference.

A control apparatus of a base station, the control apparatus comprising:

• a control unit that controls transmission power of a downlink radio signal transmitted by the base station, based on a calculated difference between the reception quality of the downlink radio signal and the reception quality of a peripheral cell downlink radio signal, measured by at least one mobile station, so that a reception quality of the downlink radio signal transmitted from the base station exceeds a second predetermined value of reception quality, at a position of a mobile station at which a reception quality of the peripheral cell downlink radio signal is lower than a first predetermined value based on a measurement result by the at least one mobile station of the reception quality of the peripheral cell downlink radio signal, wherein the mobile station is in radio communication with the base station,
• wherein the control unit controls the transmission power of the downlink radio signal based on the calculated difference calculated at least one position of the mobile station at which the reception quality of the peripheral cell downlink radio signal exceeds the first predetermined value and the reception quality of the downlink radio signal exceeds the reception quality of the peripheral cell downlink radio signal, and the control unit controls the transmission power of the downlink radio signal to decrease the transmission power of the downlink radio signal according to the calculated difference.

A method of controlling transmission power of a base station, the method comprising:

• obtaining a reception quality of a peripheral cell downlink radio signal as measured by at least one mobile station in communication with the base station;
• and
• controlling a transmission power of an downlink radio signal transmitted by the base station, based on a calculated difference between the reception quality of the downlink radio signal and the reception quality of the peripheral cell downlink radio signal, measured by the at least one mobile station, so that a reception quality of the downlink radio signal exceeds a second predetermined value of reception quality, as measured by the at least one mobile station at a position at which the reception quality of the peripheral cell downlink radio signal is lower than a first predetermined value of reception quality standard,
• wherein the controlling the transmission power of the downlink radio signal further comprises controlling the transmission power of the downlink radio signal based on the calculated difference calculated at least one position of the mobile station at which the reception quality of the peripheral cell downlink radio signal exceeds the first predetermined value and the reception quality of the downlink radio signal exceeds the reception quality of the peripheral cell downlink radio signal, and the control unit controls the transmission power of the downlink radio signal to decrease the transmission power of the downlink radio signal according to the calculated difference.

A non-transitory computer readable medium storing a program for causing a computer to execute control processing regarding base station equipment that performs radio communication with a mobile station, wherein

• the control processing comprises:
• acquiring a reception quality of a peripheral cell downlink radio signal as measured by the mobile station in communication with the base station;
• and
• controlling a transmission power of downlink radio signal transmitted by the base station, based on a calculated difference between the reception quality of the downlink radio signal and the reception quality of the peripheral cell downlink radio signal, measured by the at least one mobile station, so that a reception quality of the downlink radio signal exceeds a second predetermined value of reception quality, as measured by the mobile station at a position at which the reception quality of the peripheral cell downlink radio signal is lower than a first predetermined reception quality,
• wherein the controlling the transmission power of the downlink radio signal further comprises controlling the transmission power of the downlink radio signal based on the calculated difference calculated at least one position of the mobile station at which the reception quality of the peripheral cell downlink radio signal exceeds the first predetermined value and the reception quality of the downlink radio signal exceeds the reception quality of the peripheral cell downlink radio signal, and the control unit controls the transmission power of the downlink radio signal to decrease the transmission power of the downlink radio signal according to the calculated difference.

A radio communication system comprising:

• a base station comprising:
• a radio communication unit which transmits a downlink radio signal to at least one mobile station;
• a control unit which controls a transmission power of the downlink radio signal, based on a calculated difference between the reception quality of the downlink radio signal and the reception quality of a peripheral cell downlink radio signal, measured by the at least one mobile station, such that a reception quality of the downlink radio signal exceeds a second predetermined value of reception quality, as measured by the at least one mobile station at a position at which a reception quality of the peripheral cell downlink radio signal is less than a first predetermined value of reception quality,
• wherein the control unit controls the transmission power of the downlink radio signal based on the calculated difference calculated at least one position of the mobile station at which the reception quality of the peripheral cell downlink radio signal exceeds the first predetermined value and the reception quality of the downlink radio signal exceeds the reception quality of the peripheral cell downlink radio signal, and the control unit controls the transmission power of the downlink radio signal to decrease the transmission power of the downlink radio signal according to the calculated difference.