Patent ID: 8345582

Claim:
A base station apparatus used for a frequency division duplex (FDD) mobile communications system which uses at least a predetermined frequency bandwidth, wherein the predetermined frequency bandwidth is also used in a different neighboring FDD mobile communications system, the base station apparatus comprising: a control unit which, based on location information of the base station apparatus, provides an instruction signal which at least indicates a frequency band used in wireless communications; and a unit which wirelessly communicates with a user apparatus according to the instruction signal, wherein, if the base station apparatus belongs to a predetermined border area between mobile communications systems, an instruction signal which indicates that use of one part of the predetermined frequency band is permitted, but use of another part is prohibited is provided by the control unit, and, if the base station apparatus belongs to a predetermined non-border area, an instruction signal which indicates that use of one part of the predetermined frequency band and use of the other part are permitted.