A user terminal configured to perform communication with an infrastructure equipment of a mobile communications network. The user terminal including a receiver configured to receive signals transmitted by the infrastructure equipment in accordance with a wireless access interface and a transmitter configured to transmit signals to the infrastructure equipment in accordance with the wireless access interface. The user terminal is configured to receive an indication on a downlink of the wireless access interface of one of a plurality of different subcarrier spacing which the communications device should use to transmit or to receive the signals representing the data.