Mobile station apparatus, base station apparatus, radio communication method and communication circuit that execute radio communication using component carriers

A base station apparatus comprising:

• a radio resource controller configured to configure a first Radio Network Temporary Identifier (RNTI) and a second RNTI for a mobile station apparatus;
• and
• a transmitter configured to transmit to the mobile station apparatus:
• a first physical downlink control channel with first downlink control information on a first common search space in a first downlink component carrier, first cyclic redundancy check bits being attached to the first downlink control information, and the first cyclic redundancy check bits being scrambled by the first RNTI;
• a second physical downlink control channel with second downlink control information on a second common search space in a second downlink component carrier, the second common search space being different from the first common search space, the second downlinks component carrier being different from the first downlink component carrier, second cyclic redundancy check bits being attached to the second downlink control information, and the second cyclic redundancy check bits being scrambled by the second RNTI;
• and
• a physical downlink shared channel in each of more than two downlink component carrier, the more than two downlink component carrier including the first downlink component carrier and the second downlink component carrier, wherein
• the first downlink component carrier and the second downlink component carrier are indicated by a higher layer.

A communication method of a mobile station apparatus comprising:

• configuring a first Radio Network Temporary Identifier (RNTI) and a second RNTI;
• and
• receiving:
• a first physical downlink control channel with first downlink control information on a first common search space in a first downlink component carrier, first cyclic redundancy check bits being attached to the first downlink control information, and the first cyclic redundancy check bits being scrambled by the first RNTI;
• a second physical downlink control channel with second downlink control information on a second common search space in a second downlink component carrier, the second common search space being different from the first common search space, the second downlink component carrier being different from the first downlink component carrier, second cyclic redundancy check bits being attached to the second downlink control information, and the second cyclic redundancy check bits being scrambled by the second RNTI;
• and
• a physical downlink shared channel in each of more than two downlink component carriers, the more than two downlink component carrier including the first downlink component carrier and the second downlink component carrier, wherein
• the first downlink component carrier and the second downlink component carrier are indicated by a higher layer.

A communication method of a base station apparatus comprising:

• configuring a first Radio Network Temporary Identifier (RNTI) and a second RNTI for a mobile station apparatus:
• and
• transmitting to the mobile station apparatus:
• a first physical downlink control channel with first downlink control information on a first common search space in a first downlink component carrier, first cyclic redundancy check bits being attached to the first downlink control information, and the first cyclic redundancy check bits being scrambled by the first RNTI;
• a second physical downlink control channel with second downlink control information on a second common search space in a second downlink component carrier, the second common search apace being different from the first common search space, the second downlink component carrier being different from the first downlink component carrier second cyclic redundancy check bits being attached to the second downlink control information, and the second cyclic redundancy check bits being scrambled by the second RNTI;
• and
• a physical downlink shared channel in each of more than two downlink component carrier, the more than two downlink component carrier including the first downlink component carrier and the second downlink component carrier, wherein
• the first downlink component carrier and the second downlink component carrier are indicated by a higher layer.