Integrated circuit for decoding control information in radio communication

An integrated circuit comprising circuitry, which, in operation:

• controls reception of control information that includes assignment information indicating one or more resource blocks allocated according to one of a first allocation and a second allocation, and that includes information indicating one of the first allocation and the second allocation;
• and
• decodes data based on the control information,
• wherein:
• a plurality of subcarriers that are consecutive in a frequency domain form one resource block, a determined number of resource blocks that are consecutive in the frequency domain form a group, and a plurality of groups exist;
• in the first allocation, first groups that are inconsecutive in the frequency domain form a first subset of the plurality of groups, second groups that are inconsecutive in the frequency domain form a second subset of the plurality of groups, the first subset and the second subset are different from each other, and the assignment information indicates the allocated one or more resource blocks from one of the first subset and the second subset;
• in the second allocation, the assignment information indicates the allocated one or more resource blocks that are consecutive in the frequency domain;
• and
• the assignment information has the same number of bits in the first allocation and the second allocation.