Radio communication system, radio base station apparatus, user terminal, and radio communication method

A radio base station apparatus comprising:

• a receiving section that receives an unlink signal;
• a software module generating downlink control information including carrier indicator field (CIF) representing a carrier index and a subframe index, wherein the carrier index and the subframe index respectively indicates a component carrier and a subframe in which a downlink shared channel is transmitted by time division duplexing;
• and
• a transmission section that transmits the downlink control information including the CIF to the user terminal.

A user terminal comprising:

• a receiving section that receives downlink control information including carrier indicator field (CIF) representing a carrier index and a subframe index;
• a software module performing signal processing on a downlink shared channel which is transmitted by time division duplexing in a component carrier and a subframe respectively indicated by the carrier index and the subframe index which are represented by the CIF in the downlink control information;
• and
• a transmission section that transmits an uplink signal.

A radio communication method comprising the steps of:

• generating, by a radio base station apparatus, downlink control information including carrier indicator field (CIF) representing a carrier index and a subframe index;
• transmitting, by the radio base station apparatus, the downlink control information including the CIF;
• and
• receiving, by a user terminal, the downlink control information including the CIF;
• and
• performing, by the user terminal, signal processing on a downlink shared channel which is transmitted by time division duplexing in a component carrier and a subframe respectively indicated by the carrier index and the subframe index which are represented by the CIF in the downlink control information.