User apparatus, base station apparatus, and communication control method for controlling coverage area and data rate according to environments

A base station apparatus that communicates with a user apparatus to which radio access schemes of a single-carrier scheme and a multicarrier scheme are applied, comprising:

• a radio access scheme setting unit configured to set a radio access scheme to be used by the user apparatus;
• a waveform shaping condition setting unit configured to set a roll-off factor based on which the user apparatus performs waveform shaping, according to the radio access scheme set by the radio access scheme setting unit;
• and
• a reporting unit configured to report, by radio, information indicating the radio access scheme set by the radio access scheme setting unit and the roll-off factor set by the waveform shaping condition setting unit,
• wherein the waveform shaping condition setting unit sets the roll-off factor to be 0 when the radio access scheme set by the radio access scheme setting unit is the multicarrier scheme, and the waveform shaping condition setting unit sets the roll-off factor based on a radius of a cell covered by the base station apparatus when the radio access scheme is the single-carrier scheme.

A communication control method in a radio communication system including a user apparatus to which radio access schemes of a single-carrier scheme and a multicarrier scheme are applied, and a base station apparatus that communicates with the user apparatus, comprising:

• a step in which the base station apparatus sets a radio access scheme to be used by the user apparatus;
• a step in which the base station apparatus sets a roll-off factor based on which the user apparatus performs waveform shaping, according to the radio access scheme set in the step of setting the radio access scheme;
• a step in which the base station apparatus reports, by radio, information indicating the radio access scheme set in the step of setting the radio access scheme and the roll-off factor;
• a step in which the user apparatus sets the radio access scheme according to the radio access scheme reported from the base station apparatus;
• a conversion step in which the user apparatus performs discrete Fourier transform on a modulated symbol sequence or performs serial parallel conversion on the modulated symbol sequence according to the radio access scheme set by the step of setting the radio access scheme;
• a step in which the user apparatus assigns radio resources to the modulated symbol sequence on which discrete Fourier transform has been performed in the conversion step or to the demodulated symbol sequence on which serial parallel conversion has been performed so as to generate a signal in the frequency domain;
• a step in which the user apparatus performs waveform shaping on the signal in the frequency domain generated by the step of generating the signal of the frequency domain according to the roll-off factor reported by the base station apparatus;
• a step in which the user apparatus performs inverse fast Fourier transform on the signal in the frequency domain on which waveform shaping has been performed by the step of waveform shaping so as to generate a transmission signal;
• and
• a step in which the user apparatus transmits the transmission signal generated by the step of generating the transmission signal by radio,
• wherein in the step of setting the roll-off factor, the base station apparatus sets the roll-off factor to be 0 when the radio access scheme is the multicarrier scheme, and the base station apparatus sets the roll-off factor based on a radius of a cell covered by the base station apparatus when the radio access scheme is the single-carrier scheme.