Abstract: To provide a transmission power control method, base station apparatus and mobile station apparatus for enabling the transmission power in the mobile station apparatus having a plurality of antennas to be properly controlled, enabled is one of a common control mode for transmitting a common TPC command to perform transmission power control common to antennas (102a, 102b) to the mobile station apparatus (100) and an individual control mode for transmitting individual TPC commands to perform transmission power control individually on the antennas (102a, 102b) to the mobile station apparatus (100).

Abstract: To set an optimal transmission power control interval such that a base station apparatus properly receives signals from a mobile station, while exploiting fast scheduling and fast AMC, in this closed-loop transmission power control method, reception SINR and average interference level are measured in a signal received in uplink, a time period for averaging reception quality is determined corresponding to an overlapped size of a dynamic range of a base station apparatus that is a region of overlapping a first reception-allowable range depend on reception capability of the base station apparatus, with a second reception-allowable range, varying corresponding to the interference level, depend on the number of a modulation and coding scheme set, each set achieving required throughput, the reception SINR is averaged using the determined time period, and a TPC command indicative of uplink transmission power to be controlled in a terminal apparatus is generated using a difference value between the averaged reception

Abstract: A disclosed base station apparatus includes a measurement unit measuring received quality of a reference signal, a scheduling unit providing scheduling information indicating allocation of a radio resource in uplink, and a transmission unit transmitting a control signal including the scheduling information. Further when, after a first packet is transmitted using a first frequency band, a retransmission packet of the first packet is transmitted using a second frequency band other than the first frequency band, the control signal further includes information indicating a difference between received quality in the first frequency band and that in the second frequency band, and the retransmission packet is transmitted at a transmission power level determined by adding a transmission power level of the first packet to that corresponding to the difference.

Abstract: A base station apparatus capable of communicating with a user equipment terminal using an uplink shared channel includes a radio resource allocation unit configured to decrease frequency resources allocated to the shared channel, when transmission power of the user equipment terminal is less than a predetermined threshold.

Abstract: In a radio communication system including a mobile station and a base station apparatus for communicating with the mobile station according to a SC-FDMA scheme in uplink, the mobile station includes a transmitting unit configured to transmit at least one of a first signal and a second signal; and a Sounding RS transmitting unit configured to determine a transmission band for a Sounding Reference Signal (Sounding RS) based on mapping information of at least one of the first signal and the second signal.

Abstract: The object is achieved by a base station apparatus performing communications with mobile stations transmitting an uplink signal based on a frequency division multiple access scheme, the base station apparatus being provided with a unit for calculating an uplink interference wave level IoT and receive quality SIR of a pilot signal based on an uplink reference signal.