Wireless communication system, wireless transmitting apparatus, wireless receiving apparatus, wireless transmission method, and wireless reception method

A base station device that communicates with a mobile station device using a plurality of component carriers, wherein

• a downlink control channel used to transmit control data to said mobile station device is allocated to each of said plurality of component carriers, and wherein
• modulated symbols of said downlink control channel are cyclically-shifted for each said component carrier to change structure of said downlink control channel.

A base station device that communicates with a mobile station device using a plurality of component carriers, the base station device comprising:

• a multiplexing section for allocating, to each of said plurality of component carriers, a downlink control channel used to transmit control data to said mobile station device;
• and
• a shift section for cyclically-shifting modulated symbols of said downlink control channel for each said component carrier, to change structure of said downlink control channel.

A mobile station device that communicates with a base station device using a plurality of component carriers to which downlink control channels used to transmit control data are allocated, wherein

• the mobile station device performs processing of receiving said downlink control channel in which structure of the downlink control channel is changed by cyclically-shifting modulated symbols of said downlink control channel for each said component carrier in said base station device.

A mobile station device that communicates with a base station device using a plurality of component carriers to which downlink control channels used to transmit control data are allocated, the mobile station device comprising

• a reception processing section that performs processing of receiving said downlink control channel in which structure of the downlink control channel is changed by cyclically-shifting modulated symbols of said downlink control channel for each said component carrier in said base station device.

A transmission method used for a base station device that communicates with a mobile station device using a plurality of component carriers, the method comprising the steps of:

• allocating a downlink control channel used to transmit control data to said mobile station device, to each of said plurality of component carriers;
• and
• cyclically-shifting modulated symbols of said downlink control channel for each said component carrier, to change structure of said downlink control channel.

A reception method used for a mobile station device that communicates with a base station device using a plurality of component carriers to which downlink control channels used to transmit control data are allocated, the method comprising the step of

• performing processing of receiving said downlink control channel in which structure of the downlink control channel is changed by cyclically-shifting modulated symbols of said downlink control channel for each said component carrier in said base station device.