Base station apparatus, terminal device, and rank setting method

A base station apparatus supporting band aggregation that combines a first band and a second band, the apparatus comprising:

• a first setting section that sets a rank indication of the first band based on the number of eigenvalues of a channel matrix of the first band that achieves a desired channel quality;
• and
• a second setting section that sets a rank indication of the second band based on the number of eigenvalues of a channel matrix of the second band that achieves channel quality corresponding to the rank indication of the first band.

A terminal apparatus supporting band aggregation that combines a first band and a second band, the apparatus comprising:

• an obtaining section that obtains information about a rank indication of the first band that is set based on the number of eigenvalues of a channel matrix of the first band that achieves a desired channel quality;
• and
• a second setting section that sets a rank indication of the second band based on the number of eigenvalues of a channel matrix of the second band that achieves channel quality corresponding to the rank indication of the first band.

A rank indication setting method that sets a rank indication of a second band in a radio communication apparatus supporting band aggregation that combines a first band and the second band, the method:

• obtains a rank indication of the first band that is set based on the number of eigenvalues of a channel matrix of the first band that achieves a desired channel quality;
• and
• sets the rank indication of the second band based on the number of eigenvalues of a channel matrix of the second band that achieves channel quality corresponding to the rank indication of the first band.