Ntt Docomo, Inc.

Naoki Nakaminami

Seizo Onoe

Masayuki Motegi

Daisuke Koizumi

Yoshitsugu Shimazu

Hiroyuki Ishii

Kohei Kiyoshima

Yoshitaka Hiramoto

A base station includes a determination unit that determines whether user equipment performs radio communication through a booster, based on delay time of a signal transmitted to and received from the user equipment; a target SIR setting unit that sets a target SIR to be compared to a received SIR for performing transmission power control based on the received SIR of an uplink signal from the user equipment; a transmission power control signal generating unit that generates, based on the target SIR and the received SIR, a transmission power control signal to be set for controlling transmission power of the user equipment; and a transmitter that transmits the transmission power control signal to the user equipment. When determination is made that the radio communication is performed through the booster, the target SIR is set to be less than or equal to a predetermined upper limit value.

Base station and method

A shared transmission/reception apparatus (OF-TRX) includes: a transmission/reception processor section (TRX-B) for a mobile communication system B configured to perform frequency conversion processing on a transmission baseband signal for the mobile communication system B outputted from a signal converter section (E/O), and to output a transmission radio frequency signal for the mobile communication system B; a power level adjuster section (VA) configured to adjust a power level of a transmission radio frequency signal for a mobile communication system A inputted from a transmission/reception processor section (TRX-A) for the mobile communication system A; a combiner section (COM) configured to generate a transmission radio frequency signal by combining the transmission radio frequency signal for the mobile communication system A outputted from the power level adjuster section (VA) and the transmission radio frequency signal for the mobile communication system B outputted from the transmission/reception processor section (TRX-B) for the mobile communication system B; and a common amplifier section (PA) configured to amplify a power level of the transmission radio frequency signal outputted from the combiner section (COM) at a predetermined amplification rate, and to output the resultant signal.

Radio base station apparatus

A shared AMP includes: a transmission/reception processor section (TRX-B) for a second mobile communication system configured to perform frequency conversion processing on an inputted transmission baseband signal for a mobile communication system B, and to output a transmission radio frequency signal for the second mobile communication system; a power level adjuster section (VA) configured to adjust a power level of an inputted transmission radio frequency signal for a first mobile communication system; a combiner section (COM) configured to generate a transmission radio frequency signal, by combining the transmission radio frequency signal for the first mobile communication system outputted from the power level adjuster section (VA) and the transmission radio frequency signal for the second mobile communication system outputted from the transmission/reception processor section (TRX-B) for the second mobile communication system; and a common amplifier section (PA) configured to amplify a power level of the transmission radio frequency signal outputted from the combiner section (COM) at a predetermined amplification rate, and to output the resultant signal.

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Yokohama, Japan

Naoki Nakaminami