Patent ID: 8199710

Claim:
A processing method in a base station, comprising: allocating signatures, in a predetermined constant-total number of signatures, to each of a first signature group and a second signature group, from which a single signature is obtained by a mobile station for use in random access; notifying the mobile station of information representing one of a plurality of predetermined numbers of signatures included in the second signature group, permitting the mobile station to specify a signature included in the second signature group, wherein signatures comprising the first signature group are selectable by the base station, and signatures comprising the second signature group are selectable by the mobile station, signature ID numbers which respectively specify the signatures included in the first signature group, and signature ID numbers which respectively specify the signatures included in the second signature group, are arranged according to a predetermined rule, and the base station is configured to perform control for varying the number of signatures contained in the first signature group and the number of signatures contained in the second signature group.