Communication terminal and device

A communication device for performing wireless communication with a terminal, comprising:

• a reference-signal reception unit which receives from said terminal a pilot signal spreading over a plurality of sub-bands for evaluation of communication quality of the sub-bands;
• a communication-quality measurement unit which measures communication quality of each of the plurality of sub-bands on a basis of the pilot signal that is received;
• and
• a sub-band assignment unit which assigns a first single sub-band among the plurality of sub-bands to the terminal on a basis of the measured communication quality, for the terminal to perform wireless communication with the communication device in non-hopping mode;
• and
• wherein:
• the sub-band assignment unit causes the terminal to perform wireless communication in the non-hopping mode by using the first single sub-band for a predetermined time, and thereafter to switch from the non-hopping mode to hopping mode to continue the wireless communication by using the plurality of sub-bands in turn,
• the communication-quality measurement unit re-measures communication quality of each of the plurality of sub-bands based on the pilot signal received during the wireless communication in the hopping mode, and
• the terminal stops the hopping mode upon completion of one round of using the plurality of sub-bands, and the sub-band assignment unit re-assigns a second single sub-band to the terminal which is selected from among the plurality of sub-bands based on the re-measured communication quality and causes the terminal to continue the wireless communication in non-hopping mode by using the second single sub-band.