Communication system of using carrier aggregation and base station and terminl included in the communication system

The system and the second type of system of the first type is present, depending on whether or not the carrier aggregation. Common carrier element on the other hand is used for all of the terminal station and the second type of the first type, only a carrier component is used only for the terminal of the second type. In addition, the second type base station transmits broadcast information by using a common carrier element. At this time, the broadcast information includes a dedicated broadcast information for a shared broadcast information and the terminal of the second type for the terminal of the first type terminals and second type. In addition, the base station can use the semi-static or dynamic element carrier indicator element carrier indicator to indicate an element carrier that is used by the second type of terminals. Carrier aggregation, the base station, a terminal, an element carrier, the broadcast information, carrier indicator element