Mobile station, base station, transmission method and receiving method

A communication apparatus, comprising:

• a receiver, which, in operation, receives resource assignment information indicating at least one set of a plurality of interlace indices, wherein the resource assignment information indicates a number of second resource blocks (RBs);
• and
• a transmitter, which, in operation, transmits an uplink signal on first resource blocks (RBs) within a band,
• wherein, a number of the first RBs is the largest integer that is not greater than the number of second RBs indicated by the resource assignment information and that is based on a multiplication of prime numbers that are two, three and five,
• wherein the number of second RBs is different from the number of the first RBs.

A communication method, comprising:

• receiving resource assignment information indicating at least one set of a plurality of interlace indices, wherein the resource assignment information indicates a number of second resource blocks (RBs);
• and
• transmitting an uplink signal on first resource blocks (RBs) within a band,
• wherein, a number of the first RBs is the largest integer that is not greater than the number of second RBs indicated by the resource assignment information and that is based on a multiplication of prime numbers that are two, three and five,
• wherein the number of second RBs is different from the number of the first RBs.