Patent ID: 8134983

Claim:
A base station apparatus, comprising: a TTI-length determining unit which determines, based on a number of errors and/or an error rate of a L1/L2 control channel transmitted from a mobile station, whether data is to be transmitted in a first TTI with, as a unit, a predetermined period no shorter than a subframe length, or in a second TTI with, as a unit, a period shorter than the first TTI; a number-of-subframes determining unit which determines a number of subframes making up the determined TTI; a reporting unit which reports the determined TTI and the number of subframes making up the determined TTI to the mobile station; and a scheduler which performs scheduling based on the determined TTI and the number of subframes making up the determined TTI, wherein the TTI-length determining unit determines that, when the number of errors and/or the error rate of the L1/L2 control channel is no less than a predetermined threshold, the data is transmitted in the first TTI, and, when the number of errors and/or error rate of the L1/L2 control channel is less than the predetermined threshold, the data is transmitted in the second TTI.