User terminal, radio base station and radio communication method

A radio base station that communicates with a user terminal, in which a band to use is limited to a narrower band than a minimum system bandwidth supported in an existing LTE (Long Term Evolution) system, the radio base station comprising:

• a generating section that generates a synchronization signal by using a predetermined sequence;
• and
• a transmission section that transmits the synchronization signal, by dividing the synchronization signal into a plurality of periods, in a predetermined narrow band that overlaps a frequency band in which an existing synchronization signal is transmitted,
• wherein the transmission section transmits the existing synchronization signal, which includes a divided portion of the synchronization signal, in at least one period in the plurality of periods, the portion being mapped to the predetermined narrow band.

A radio communication method for a user terminal, in which a band to use is limited to a narrower band than a minimum system bandwidth supported in an existing LTE (Long Term Evolution) system, the radio communication method comprising the steps of:

• receiving a signal that is divided into a plurality of periods and transmitted, in a predetermined narrow band that overlaps a frequency band in which an existing synchronization signal is transmitted;
• and
• performing a synchronization process by identifying the signal that is divided into the plurality of periods and transmitted as being a synchronization signal that is generated by using a predetermined sequence,
• wherein a signal that is transmitted in at least one period in the plurality of periods is a portion of the existing synchronization signal, the portion being mapped to the predetermined narrow band.