Patent ID: 8139473

Claim:
A mobile station apparatus comprising: a selecting unit configured to randomly select a sequence from a group of sequences, the group corresponding to an amount of data and a reception quality, wherein a plurality of sequences generated from a plurality of base sequences are grouped into a plurality of groups, which are respectively associated with both different amounts of data and different reception qualities, such that each group provides an indication of an amount of data and a reception quality and that those sequences that are generated from the same base sequence are first included in a predetermined number of the sequences contained in the same group; and a transmitting unit configured to transmit the selected sequence, wherein the plurality of sequences generated from the plurality of base sequences are grouped into the plurality of groups, such that all of sequences that are generated from one of the base sequences and at least one of sequences that are generated from another of the base sequences are included in the predetermined number of the sequences contained in the same group.