Base station and radio terminal

A radio terminal that performs radio communication with a base station using at least one narrow frequency band where the number of resource blocks is limited to a predetermined resource block number, the radio terminal comprising:

• a receiver configured to receive, from the base station, configuration information for performing frequency hopping where the radio communication is performed while switching the narrow frequency band, and allocation information relating to allocation of a first frequency band of the frequency hopping and a frequency band of the hopping destination;
• and
• a controller configured to control the radio communication using the frequency hopping based on the configuration information and the allocation information, wherein
• the first frequency band and the frequency band of the hopping destination respectively include the narrow frequency band allocated from the base station, and
• one frequency band out of the first frequency band and the frequency band of the hopping destination further includes the fraction resource blocks allocated from the base station,
• the fraction resource blocks are resource blocks, the number of which is smaller than the predetermined resource block number, and
• the controller is configured to decide whether or not the fraction resource blocks are to be used in the radio communication with respect to the other frequency band out of the first frequency band and the frequency band of the hopping destination.

A radio communication system comprising:

• a radio terminal configured to use at least one narrow frequency band where the number of resource blocks is limited to a predetermined resource block number;
• and
• a base station configured to transmit, to the radio terminal, configuration information for frequency hopping where radio communication with the radio terminal is performed while switching the narrow frequency band to the radio terminal, wherein
• the radio terminal includes:
• a receiver configured to receive, from the base station, the configuration information and allocation information relating to allocation of a first frequency band of the frequency hopping and a frequency band of a hopping destination;
• and
• a controller configured to control the radio communication using the frequency hopping based on the configuration information and the allocation information,
• the first frequency band and the frequency band of the hopping destination respectively include the narrow frequency band allocated from the base station,
• one frequency band out of the first frequency band and the frequency band of the hopping destination further includes fraction resource blocks allocated from the base station,
• the fraction resource blocks are resource blocks, the number of which is smaller than the predetermined resource block number, and
• the controller is configured to decide whether or not the fraction resource blocks are to be used in the radio communication with respect to the other frequency band out of the first frequency band and the frequency band of the hopping destination.