Patent ID: 8483043

Claim:
An apparatus for generating a set of radio parameters used for an OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system which transmits or receives multiple symbols for each fixed-length transmission time interval, the multiple symbols including guard intervals and effective symbols, comprising: a symbol parameter adjusting unit configured to derive a set of second symbol parameters, so that a period of an effective symbol defined by a set of first symbol parameters is equal to a period of an effective symbol defined by the set of second symbol parameters, and a period of a guard interval defined by the set of first symbol parameters is different from a period of a guard interval defined by the set of second symbol parameters; the symbol parameter adjusting unit configured to derive a set of third symbol parameters, so that a share of a guard interval in a symbol defined by the set of first symbol parameters is equal to a share of a guard interval in a symbol defined by the set of third symbol parameters, and a length of the symbol defined by the set of first symbol parameters is different from a length of the symbol defined by the set of third symbol parameters; and a transmitting unit configured to transmit to a mobile station a signal with symbols whose parameters are adjusted by the symbol parameter adjusting unit, wherein the number of symbols is adjusted so that the number of symbols in a fixed-length transmission time interval is different depending on the set of first symbol parameters, the set of second symbol parameters, or the set of third symbol parameters.