Communication system, base station apparatus, mobile terminal apparatus and communication method

A base station apparatus that communicates with a mobile terminal apparatus using a basic carrier and an extended carrier that is additionally allocated to the basic carrier, the base station apparatus comprising:

• a setting section that sets, in the extended carrier, a subframe of a first carrier type which can be received in each of a plurality of mobile terminal apparatuses of varying capabilities and a subframe of a second carrier type which can be received in part of the plurality of mobile terminal apparatuses;
• and
• a transmission section that transmits the basic carrier and the extended carrier to the mobile terminal apparatus.

A mobile terminal apparatus that communicates with a base station apparatus using a basic carrier and an extended carrier that is additionally allocated to the basic carrier, the mobile terminal apparatus comprising:

• a receiving section that receives, from the base station apparatus, the extended carrier, in which a subframe of a first carrier type which can be received in each of a plurality of mobile terminal apparatuses of varying capabilities and a subframe of a second carrier type which can be received in part of the plurality of mobile terminal apparatuses, are set.