Mobile communication method, base station, and user equipment

A mobile communication method according to one mode of embodiment of the present invention is provided with a step in which a base station configured to communicate using a narrow band, which is a second bandwidth narrower than a first bandwidth that a first user equipment can support in one unit of time, transmits information for allocating to a second user equipment an extended band having a third bandwidth which is wider than the second bandwidth and narrower than the first bandwidth, in said one unit of time.