Base station apparatus, user apparatus, and method used in mobile communication system

A method used in a region in which at least a first system and a second system co-exist, wherein

• mobile communication is conducted in the first system using a variable system bandwidth which is not more than a basic bandwidth, and
• mobile communication is conducted using a variable system bandwidth which is not more than a bandwidth of an advanced system band which is at least as wide as multiple of the basic bandwidth,
• the method comprising:
• a first generating step which generates a control signal for the first system;
• a second generating step which generates a control signal for the second system;
• a multiplexing step which orthogonally multiplexes the control signals for the first generating and the second generating;
• and
• a transmitting step which transmits a downlink signal including the control signals after the orthogonal multiplexing, wherein
• the advanced system band is divided such that it includes multiple areas of the basic bandwidth,
• the control signal for the first system is arranged to be included in one of the areas;
• and
• the control signal for the second system is arranged to be included in at least one of the areas.

A user apparatus of a second system used in a region in which at least a first system and the second system co-exist, wherein

• mobile communication is conducted in the first system using a variable system bandwidth which is not more than a basic bandwidth,
• mobile communication is conducted using a variable system bandwidth which is not more than a bandwidth of an advanced system band which is at least as wide as multiple of the basic bandwidth,
• the user apparatus comprising:
• a demultiplexing unit which demultiplexes a control signal within a received signal from other signals;
• an obtaining unit which takes out, from the control signal, control information intended for an own apparatus;
• and
• a unit which receives or transmits a data signal including user traffic data according to control information intended for the own apparatus, wherein
• the advanced system band is divided such that it includes multiple areas of the basic bandwidth,
• the control signal for the first system is included in one of the areas;
• and
• the control signal for the second system is included in at least one of the areas.

A method used in a user apparatus of a second system used in a region in which at least a first system and the second system co-exist, wherein mobile communication is conducted in the first system using a variable system bandwidth which is no more than a basic bandwidth, and

• mobile communication is conducted using a variable system bandwidth which is not more than a bandwidth of an advanced system band which is at least as wide as multiple of the basic bandwidth,
• the method comprising:
• a demultiplexing step which demultiplexes a control signal within a received signal from other signals;
• an obtaining step which takes out, from the control signal, control information intended for an own apparatus;
• and
• a step which receives or transmits a data signal including user traffic data according to the control information intended for the own apparatus, wherein
• the advanced system band is divided such that it includes multiple areas of the basic bandwidth,
• a control signal for the first system is included in one area;
• and
• the control signal for the second system is included in at least one of the areas.