Mobile communications system, base station apparatus, user apparatus and method

A user 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 user apparatus comprising:

• a unit which receives a control signal from a base station apparatus and retrieves an instruction signal which at least indicates a frequency band used in communications;
• and
• a unit which wirelessly communicates with the base station apparatus according to the instruction signal, wherein the instruction signal indicates that, if the base station apparatus belongs to a predetermined border area between mobile communications systems, use of one part of the predetermined frequency band is permitted, but use of another part is prohibited, and wherein
• the instruction signal indicates that, if the base station apparatus belongs to a predetermined non-border area, use of the one part of the predetermined frequency band and use of the other part are permitted.

A frequency division duplex (FDD) mobile communications system which uses at least a predetermined frequency bandwidth, the mobile communications system having a base station apparatus and a user apparatus, 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 instructional signal and the user apparatus, comprising:
• a unit which receives a control signal from the base station apparatus and retrieves the instruction signal from the control signal;
• and
• a unit which wirelessly communicates with the base station 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 the other part is prohibited is provided by the control unit, and, wherein,
• 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.

A method used in a frequency division duplex (FDD) mobile communications system which uses at least a predetermined frequency bandwidth, the mobile communications system having a base station apparatus and a user apparatus, wherein the predetermined frequency bandwidth is also used in a different neighboring FDD mobile communications system, the method comprising:

• based on location information of the base station apparatus, providing an instruction signal which at least indicates a frequency band used in wireless communications;
• receiving, at the user apparatus, a control signal from the base station apparatus and retrieving the instruction signal from the control signal;
• and
• wirelessly communicating between the user apparatus and the base station 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 the other part is prohibited is provided by the control unit, and, wherein,
• if the base station apparatus belongs to a predetermined non-border area, an instructional signal which indicates that use of one part of the predetermined frequency band and use of the other part are permitted.