Communications device, infrastructure equipment, wireless communications network and methods

A method of communicating data to or from a communications device via a mobile communications network, the method comprising:

• transmitting signals representing data from the communications device to an infrastructure equipment forming part of a mobile communications network via an uplink of a wireless access interface provided by the infrastructure equipment, or
• receiving signals representing data at the communications device from an infrastructure equipment via a downlink of the wireless access interface, wherein the wireless access interface can provide a plurality of different spacing of subcarriers for transmitting signals representing the data on the uplink or for receiving the signals representing the data on the downlink, wherein
• the transmitting or the receiving includes
• receiving an indication on a downlink of the wireless access interface of one of the plurality of different subcarrier spacing which the communications device should use to transmit or to receive the signals representing the data,
• receiving from the infrastructure equipment an indication of which of the subcarriers of a plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit the data to the infrastructure equipment or to receive the data from the infrastructure equipment of which plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit or to receive the data, depending on the indicated subcarrier spacing,
• receiving the indication of the subcarrier spacing with the indication of the subcarrier or multiple subcarriers to use in a downlink control message comprising a field indicating the subcarrier spacing and a field indicating the subcarrier or multiple subcarriers to use;
• and
• interpreting differently the field indicating which of the subcarrier or multiple subcarriers to use depending upon whether the field indicating the subcarrier spacing indicates a subcarrier spacing which can only be used as a single subcarrier or a subcarrier spacing which can be used as a single or multiple subcarriers.

Circuitry for a communications device for transmitting signals to and/or receiving signals from an infrastructure equipment of a mobile communications network, the circuitry comprising:

• receiver circuitry configured to receive signals transmitted by the infrastructure equipment in accordance with a wireless access interface;
• transmitter circuitry configured to transmit signals to the infrastructure equipment in accordance with the wireless access interface;
• and
• controller circuitry configured to control the transmitter and the receiver to transmit data to the infrastructure equipment via an uplink of the wireless access interface or to receive data on the downlink of the wireless access interface, wherein the wireless access interface an provide a plurality of different spacing of subcarriers for transmitting signals representing the data and the controller circuitry is configured in a combination with the transmitter circuitry and the receiver circuitry to
• receive an indication on a downlink of the wireless access interface of one of the plurality of different subcarrier spacing which the communications device should use to transmit or to receive the signals representing the data,
• receive from the infrastructure equipment an indication of which of the subcarriers of a plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit the data to the infrastructure equipment or to receive the data from the infrastructure equipment of which plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit or to receive the data, depending on the indicated subcarrier spacing,
• receive the indication of the subcarrier spacing with the indication of the subcarrier or multiple subcarriers to use in a downlink control message comprising a field indicating the subcarrier spacing and a field indicating the subcarrier or multiple subcarriers to use, and
• interpret differently the field indicating which of the subcarrier or multiple subcarriers to use depending upon whether the field indicating the subcarrier spacing indicates a subcarrier spacing which can only be used as a single subcarrier or a subcarrier spacing which can be used as a single or multiple subcarriers.

A user terminal configured to perform communication with an infrastructure equipment of a mobile communications network, the user terminal comprising:

• a receiver configured to receive signals transmitted by the infrastructure equipment in accordance with a wireless access interface;
• a transmitter configured to transmit signals to the infrastructure equipment in accordance with the wireless access interface, and
• circuitry configured to control the transmitter and the receiver to transmit data to the infrastructure equipment via an uplink of the wireless access interface and to receive data on the downlink of the wireless access interface, wherein the wireless access interface is configured to provide a plurality of different spacing of subcarriers for transmitting signals representing the data on the uplink and for receiving the signals representing the data on the downlink, wherein
• the circuitry is configured in a combination with the transmitter and the receiver to
• receive an indication on a downlink of the wireless access interface of one of the plurality of different subcarrier spacing which the communications device should use to transmit or to receive the signals representing the data,
• receive from the infrastructure equipment an indication of which of the subcarriers of a plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit the data to the infrastructure equipment or to receive the data from the infrastructure equipment of which plurality of available subcarriers, with the indicated subcarrier spacing, the communications device should use to transmit or to receive the data, depending on the indicated subcarrier spacing,
• receive the indication of the subcarrier spacing with the indication of the subcarrier or multiple subcarriers to use in a downlink control message comprising a field indicating the subcarrier spacing and a field indicating the subcarrier or multiple subcarriers to use, and
• interpret differently the field indicating which of the subcarrier or multiple subcarriers to use depending upon whether the field indicating the subcarrier spacing indicates a subcarrier spacing which can only be used as a single subcarrier or a subcarrier spacing which can be used as a single or multiple subcarriers.