Patent ID: 8452284

Claim:
A base station apparatus comprising: a first basic antenna which forms a first cell; a second basic antenna which forms a second cell neighboring to the first cell; a boundary antenna which has a propagation area directivity limited to a vicinity of a cell boundary between the first cell and the second cell; and a switching circuit configured to switch an antenna, for transmitting a radio signal to a terminal device existing within the first cell and existing in the propagation area of the boundary antenna, on a transmission-slot basis in a fast cell selection, between the first basic antenna and the boundary antenna instead of switching an antenna between the first basic antenna and the second basic antenna, wherein the boundary antenna further includes an orthogonalizing circuit configured to orthogonalize transmission data for a terminal device existing in the first cell and transmission data for a terminal device existing in the second cell to each other when at least one terminal device exists in each of the first cell as well as within the propagation area of the boundary antenna and the second cell as well as within the propagation area of the boundary antenna.