Base station apparatus, mobile communication system, and method of controlling transmission power

A base station apparatus in a mobile communication system including a plurality of mobile stations and a plurality of base station apparatuses each having an interference suppressing receiving part containing interference suppressing circuits in a plurality of stages, said base station apparatus comprising:

• a calculator for calculating a correction SIR value based on a signal-to-interference ratio (SIR value) measured from a received signal subjected to interference suppression by an interference suppressing receiving circuit in a former stage in said interference suppressing receiving part and an SIR value of the received signal subjected to interference suppression by an interference suppressing receiving circuit in a later stage;
• a means for estimating a corrected target SIR value based on the calculated correction SIR value;
• a signal generator for generating a transmission power control signal using the estimated correction target SIR value;
• and
• a transmission power controller for adding said generated transmission power control signal to a downlink frame, to control transmission power of a mobile station.

A mobile communication system including a plurality of mobile stations and a plurality of base station apparatuses each having an interference suppressing receiving part containing interference suppressing circuits in a plurality of stages, wherein:

• said base station apparatus comprising:
• a calculator for calculating a correction SIR value based on a signal-to-interference ratio (SIR value) measured from a received signal subjected to interference suppression by an interference suppressing receiving circuit in a former stage in said interference suppressing receiving part and an SIR value of the received signal subjected to interference suppression by an interference suppressing receiving circuit in a later stage;
• a means for estimating a transmission power control SIR value based on the calculated correction SIR value;
• a signal generator for generating a transmission power control signal using the estimated transmission power control SIR value;
• and
• a transmission power controller for adding said generated transmission power control signal to a downlink frame, to control transmission power of a mobile station.

A transmission power control method, by which transmission power of a mobile station is controlled from a base station apparatus in a mobile communication system including a plurality of mobile stations and a plurality of base station apparatuses each having an interference suppressing receiving part containing interference suppressing circuits in a plurality of stages, comprising steps of:

• calculating a correction SIR value based on a signal-to-interference ratio (SIR value) measured from a received signal subjected to interference suppression by an interference suppressing receiving circuit in a former stage in said interference suppressing receiving part and an SIR value of the received signal subjected to interference suppression by an interference suppressing receiving circuit in a later stage;
• estimating a transmission power control SIR value based on the calculated correction SIR value;
• generating a transmission power control signal using the estimated transmission power control SIR value;
• and
• adding said generated transmission power control signal to a downlink frame, to control the transmission power of the mobile station.

A transmission power control method, by which transmission power of a mobile station is controlled from a base station apparatus in a mobile communication system including a plurality of mobile stations and a plurality of base station apparatuses each having an interference suppressing receiving part containing interference suppressing circuits in a plurality of stages, comprising steps of:

• calculating a correction SIR value based on a signal-to-interference ratio (SIR value) measured from a received signal subjected to interference suppression by an interference suppressing receiving circuit in a former stage in said interference suppressing receiving part and an SIR value of the received signal subjected to interference suppression by an interference suppressing receiving circuit in a later stage;
• estimating a corrected target SIR value based on the calculated correction SIR value;
• generating a transmission power control signal using the estimated correction target SIR value;
• and
• adding said generated transmission power control signal to a downlink frame, to control transmission power of a mobile station.