Communications device, infrastructure equipment, wireless communications network and methods

1. A communications device configured to transmit signals to and/or receive signals from an infrastructure equipment of a mobile communications network, the communications device 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 or to receive data on the 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 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 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, and

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

the circuitry is configured to 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.

2. The communications device of claim 1 , wherein the field indicating which of the subcarrier or multiple subcarriers to use as a function of the subcarrier spacing is predetermined between the infrastructure equipment and the communications device and can be represented as a table.

3. The communications device of claim 2 , wherein the predetermined interpretation of the field indicating which of the subcarrier or multiple subcarriers to use as a function of the subcarrier spacing is received from the infrastructure equipment as part of broadcast system information.

4. The communications device of claim 1 , wherein the downlink control message includes an indication of one or more of a modulation scheme to be used, a coding scheme to be used and a transport block size to be used by the communications device when transmitting the data, and the circuitry is configured to interpret the indication of one or more of the modulation scheme, the coding scheme and the transport block size to use differently depending on the indicated subcarrier spacing.

5. The communications device of claim 4 , wherein the different interpretation of the indication of one or more of the modulation scheme, the coding scheme and the transport block size depending on the indicated subcarrier spacing is received from the infrastructure equipment as part of broadcast system information.

6. The communications device of claim 1 , wherein the circuitry is configured with the transmitter and the receiver

to measure a strength of signals received from the infrastructure equipment via the wireless access interface, and

to transmit a report of the measurements to the infrastructure equipment, the infrastructure equipment selecting the subcarrier spacing for the communications device based on the received measurement report.

7. The communications device of claim 1 , wherein the downlink control message is transmitted as part of a random access procedure.

8. The communications device of claim 1 , wherein the plurality of different spacing of the subcarriers comprises a spacing of 3.75 kHz and a spacing of 15 kHz.

9. The communications device of claim 8 , wherein the indication of the 3.75 kHz subcarrier spacing indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier.

10. The communications device of claim 8 , wherein the indication of the 15 kHz subcarrier indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier or multiple subcarriers.

11. 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.

12. The method of claim 11 , wherein the field indicating which of the subcarrier or multiple subcarriers to use as a function of the subcarrier spacing is predetermined between the infrastructure equipment and the communications device and can be represented as a table.

13. The method of claim 12 , wherein the predetermined interpretation of the field indicating which of the subcarrier or multiple subcarriers to use as a function of the subcarrier spacing is received from the infrastructure equipment as part of broadcast system information.

14. The method of claim 11 , wherein the downlink control message includes an indication of one or more of a modulation scheme to be used, a coding scheme to be used and a transport block size to be used by the communications device when transmitting the data, and the method further comprises:

interpreting the indication of one or more of the modulation scheme, the coding scheme and the transport block size to use differently depending on the indicated subcarrier spacing.

15. The method of claim 14 , wherein the different interpretation of the indication of one or more of the modulation scheme, the coding scheme and the transport block size depending on the indicated subcarrier spacing is received from the infrastructure equipment as part of broadcast system information.

16. The method of claim 11 , further comprising:

measuring a strength of signals received from the infrastructure equipment via the wireless access interface; and

transmitting a report of the measurements to the infrastructure equipment, the infrastructure equipment selecting the subcarrier spacing for the communications device based on the received measurement report.

17. The method of claim 11 , wherein the downlink control message is transmitted as part of a random access procedure.

18. The method of claim 11 , wherein the plurality of different spacing of the subcarriers comprises a spacing of 3.75 kHz and a spacing of 15 kHz.

19. The method of claim 18 , wherein the indication of the 3.75 kHz subcarrier spacing indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier.

20. The method of claim 18 , wherein the indication of the 15 kHz subcarrier indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier or multiple subcarriers.

21. 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.

22. 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.

23. The user terminal of claim 22 , wherein the downlink control message is transmitted as part of a random access procedure.

24. The user terminal of claim 22 , wherein the plurality of different spacing of the subcarriers comprises a spacing of 3.75 kHz and a spacing of 15 kHz.

25. The user terminal of claim 24 , wherein the indication of the 3.75 kHz subcarrier spacing indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier.

26. The user terminal of claim 24 , wherein the indication of the 15 kHz subcarrier indicates that the communications device should transmit the signals representing the data or receive the signals representing the data on a single subcarrier or multiple subcarriers.