Radio base station, user terminal and radio communication method

A user terminal that communicates with a radio base station by using a plurality of component carriers, comprising:

• a receiving section that receives downlink signals by using component carriers, in which a subframe of a first carrier type, which a plurality of user terminals of varying capabilities each can receive, and a subframe of a second carrier type, which part of the plurality of user terminal can receive, are configured;
• an identifying section that identifies a carrier type of each subframe by using information related to the carrier type of each subframe contained in the downlink signals;
• and
• a transmission section that transmits information related to capability for receiving the subframe of the second carrier type to the radio base station.

A radio communication method for a user terminal and a radio base station that communicate by using a plurality of component carriers, the radio communication method comprising the steps in which:

• the radio base station:
• configures a subframe of a first carrier type, which a plurality of user terminals of varying capabilities each can receive, and a subframe of a second carrier type, which part of the plurality of user terminals can receive, in component carriers, on a dynamically changing basis;
• and
• transmits downlink signals to the user terminal by using the first carrier type and the second carrier type;
• the user terminal:
• receives the downlink signals;
• and
• identifies a carrier type of each subframe by using information related to the carrier type of each subframe contained in the downlink signals.