Mobile communication terminal and control method therefor

A mobile communication terminal comprising:

• a determiner that determines whether the mobile communication terminal is in a standby mode;
• a fast Fourier transform calculator that demodulates a signal received at the mobile communication terminal;
• and
• a controller that controls the fast Fourier transform calculator to vary at least one of a frequency range for fast Fourier transform or a number of frequency samples used by the fast Fourier transform calculator, depending on the determination by the determiner and based on information about frequency allocation in downlink communication from a radio base station to the mobile communication terminal and notified from the radio base station, wherein
• the controller controls the fast Fourier transform calculator to limit the frequency range for fast Fourier transform to a subcarrier frequency range for a control signal of the mobile communication terminal and a frequency covering a possible Doppler frequency transition which is induced by movement of the mobile communication terminal and originated from the subcarrier frequency range when the mobile communication terminal in the standby mode.

A control method for a mobile communication terminal, comprising:

• determining whether the mobile communication terminal is in a standby mode;
• executing fast Fourier transform to demodulate a signal received at the mobile communication terminal;
• and
• varying at least one of a frequency range for the fast Fourier transform or a number of frequency samples used by the fast Fourier transform, depending on the determining and based on information about frequency allocation in downlink communication from a radio base station to the mobile communication terminal and notified from the radio base station, wherein
• the varying includes limiting the frequency range for fast Fourier transform to a subcarrier frequency range for a control signal of the mobile communication terminal when the mobile communication terminal in the standby mode.

A control method for a mobile communication terminal, comprising:

• determining whether or not the mobile communication terminal is in a standby mode;
• executing fast Fourier transform to demodulate a signal which is received at the mobile communication terminal;
• and
• varying at least one of a frequency range for the fast Fourier transform or a number of frequency samples used by the fast Fourier transform, depending on the determining and based on information about frequency allocation in downlink communication from a radio base station to the mobile communication terminal and notified from the radio base station, wherein
• the varying includes limiting the frequency range for fast Fourier transform to a subcarrier frequency range for a control signal of the mobile communication terminal and a frequency range covering a possible Doppler frequency transition which is induced by movement of the mobile communication terminal and originated from the subcarrier frequency range when the mobile communication terminal in the standby mode.