User terminal, radio base station and radio communication method

A radio base station that communicates with a user terminal that employs carrier aggregation using a plurality of component carriers (CCs), the radio base station comprising:

• a transmission section that transmits DL signals in each CC;
• and
• a control section that controls transmission of the DL signals,
• wherein, when a plurality of CCs, including at least a first CC, which corresponds to a primary CC of an existing system, and a third CC, which is different from the first CC and a second CC that corresponds to a secondary CC of the existing system, are configured, the control section controls receiving operations and/or measurement operations of the user terminal in the third CC, by using DL signals transmitted from the first CC and/or the second CC.

A radio communication method in a user terminal that communicates with a radio base station by means of carrier aggregation using a plurality of component carriers (CCs), the radio communication method comprising the steps of:

• receiving DL signals transmitted from each CC;
• and
• making measurements by using the DL signals,
• wherein, when a plurality of CCs, including at least a first CC, which corresponds to a primary CC of an existing system, and a third CC, which is different from the first CC and a second CC that corresponds to a secondary CC of the existing system, are configured, receiving operations and/or measurement operations that are different from those of the second CC are applied to the third CC.