Patent ID: 8902764

Claim:
A base station apparatus that communicates with a plurality of terminal apparatuses using a time division duplex scheme in which a downlink bandwidth and an uplink bandwidth are different, the base station apparatus comprising: an allocation section that allocates a downlink band and an uplink band to a specific terminal apparatus in the plurality of terminal apparatuses, such that a frequency of the allocated uplink band is the same as a frequency of a first part of the allocated downlink band; a reception section that receives downlink channel state information (DL-CSI) of a second part of the downlink band other than the first part of the downlink band from the specific terminal apparatus, the received DL-CSI being used as a second DL-CSI for closed loop control processing; a request section that transmits, to the specific terminal apparatus, request information for requesting feedback of the DL-CSI of the second part of the allocated downlink band; a channel estimation section that performs channel estimation using a pilot signal transmitted on the allocated uplink band from the specific terminal apparatus, to estimate uplink channel state information (UL-CSI), the estimated UL-CSI being used as a first DL-CSI for the closed loop control processing; and a control section that performs the closed loop control processing in the allocation section using the first DL-CSI and the second DL-CSI, wherein: the reception section receives a downlink channel quality indicator (DL-CQI) from the specific terminal apparatus, the DL-CQI being equal to or more than a first threshold value of channel quality.