Communications devices, infrastructure equipment and methods

1. An infrastructure equipment of a mobile communications network configured to receive signals from a communications device, the infrastructure equipment comprising

a receiver configured to receive signals transmitted by the communications device in accordance with a wireless access interface, and

a controller configured to control the receiver to receive data via an uplink of the wireless access interface, and the controller is configured in combination with the receiver

to receive a plurality of sub-units of an encoded transport block of data in a plurality of time-divided units within frequency resources of the wireless access interface allocated to the communications device, each of the sub-units being received a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being received a first repeated number of times and a second sub-unit of the plurality of sub-units being received a second repeated number of times, wherein the first and second repeated number of times are different, and

to combine the same sub-unit received its respective repeated number of times to form a composite sub-unit to recover the transport block.

2. The infrastructure equipment as claimed in claim 1 , wherein the repetition cycle is a first repetition cycle and the repeated number of times each sub-unit is transmitted in the first repetition cycle is a first repeated numberof times and the receiver is configured

to receive each sub-unit a repeated numberof times in one or more subsequent repetition cycles, for each of the one or more subsequent repetition cycles to receive each of the sub-units the repeated number of times within the repetition cycle,

to combine symbols of the same sub-unit received the repeated number of times for the sub-unit to form for the repetition cycle a composite sub-unit, and

to recover the transport block from the composite sub-units by combining the composite sub-units formed from different repetition cycles when decoding.

3. The infrastructure equipment as claimed in claim 2 , wherein the transport block has been encoded with an error correction and/or detection code and the controller is configured in combination with the receiver

to decode the transport block formed from the composite sub-units received from the first repetition cycle,

to detect whether the transport block has been successfully decoded, and if successfully decoded to output the transport block, or if not successfully decoded to combine the composite sub-units formed from the one or more subsequent repetition cycles with the sub-units received from the first repetition cycle, and

to decode the combined composite units of the transport block.

4. The infrastructure equipment as claimed in claim 3 , wherein the detecting whether the transport block has been successfully decoded is configured to be carried out by the controller subsequently to each of a combination of the current combined composite sub-units and a composite sub-unit formed from a next one or more of the one or more subsequent repetition cycles.

5. The infrastructure equipment as claimed in claim 3 , wherein the detecting whether the transport block has been successfully decoded is configured to be carried out by the controller subsequently to the sub-units of a next one or more of the subsequent repetition cycles being received.

6. A method of controlling communications at a communications device comprising a transmitter configured to transmit signals to an infrastructure equipment of a mobile communications network in accordance with a wireless access interface provided by the infrastructure equipment, the method comprising

dividing an encoded transport block of data into a plurality of sub-units for transmission in a plurality of the time-divided units and one or more of the frequency resources of the wireless access interface allocated to the communications device,

transmitting each sub-unit a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being transmitted a first repeated number of times and a second sub-unit of the plurality of sub-units being transmitted a second repeated number of times, wherein the first and second repeated number of times are different, and

transmitting each sub-unit the repeated number of times in one or more subsequent repetition cycles, each sub-unit being transmitted the repeated number of times whereby the infrastructure equipment can combine the same sub-unit within each repetition cycle to form a composite sub-unit for each of the repetition cycles for recovering the transport block.

7. A method of controlling communications at an infrastructure equipment of a mobile communications network configured to receive signals from a communications device, the method comprising

receiving a plurality of sub-units of an encoded transport block of data in a plurality of time-divided units within one or more frequency resources of the wireless access interface allocated to the communications device, each of the sub-units being received a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being received a first repeated number of times and a second sub-unit of the plurality of sub-units being received a second repeated number of times, wherein the first and second repeated number of times are different, and

combining the same sub-unit received its respective repeated number of times to form a composite sub-unit to recover the transport block.

8. A communications device comprising

a receiver configured to receive signals transmitted by an infrastructure equipment of a wireless communications network in accordance with a wireless access interface provided by the infrastructure equipment, and

a controller configured to control the receiver to receive data via a downlink of the wireless access interface, wherein the wireless access interface includes communications resources for allocation to the communications device on the downlink, the communications resources comprising frequency resources, and time resources in which the wireless access interface is divided into predetermined time-divided units and the controller is configured in combination with the receiver

to receive a pluraift of sub-units of an encoded transport block of data in a plurality of time-divided units within frequency resources of the wireless access interface allocated to the communications device, each of the sub-units being received a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being received a first repeated number of times and a second sub-unit of the plurality of sub-units being received a second repeated number of times, wherein the first and second repeated number of times are different, and

to combine the same sub-unit received its respective repeated number of times to form a. composite sub-unit to recover the transport block.

9. An infrastructure equipment of a mobile communications network configured to transmit signals to a communications device, the infrastructure equipment comprising

a transmitter configured to transmit signals to the communications device in accordance with a wireless access interface, and

a controller configured to control the transmitter to transmit data via a downlink of the wireless access interface, and the controller is configured in a combination with the transmitter

to divide an encoded transport block of data into a plurality of sub-units for transmission in a plurality of the time-divided units and one or more of frequency resources of the wireless access interface allocated to the communications device,

to transmit each sub-unit a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being transmitted a first repeated nwriber of times and a second sub-unit of the plurality of sub-units being transmitted a second repeated number of times, wherein the first and second repeated number of times are different, and

to transmit each sub-unit the repeated number of times in one or more subsequent repetition cycles, each sub-unit being transmitted the repeated number of times whereby the communications device can combine the same sub-unit within each repetition cycle to firm a composite sub-unit for each of the repetition cycles for recovering the transport block.

10. The infrastructure equipment as claimed in claim 9 , wherein one or more of the composite sub-units from different repetition cycles can be combined when decoding to recover the transport block.

11. The infrastructure equipment as claimed in claim 9 , wherein the repeated number of times of transmission of the sub-units is dynamically configured.

12. The infrastructure equipment as claimed in claim 11 , comprising a receiver configured to receive signals transmitted by the infrastructure equipment wherein the receiver is configured to receive an indication of the repeated number of times of transmission of the sub-units dynamically configured by the communications device.

13. The infrastructure equipment as claimed in claim 12 , wherein the indication of the repeated number of times of transmission of the sub-units received from the communications device is in response to a channel status for receiving the signals transmitted by the transmitter at the communications device.

14. The infrastructure equipment as claimed in claim 9 , wherein the repeated number of times of transmission of the sub-units is predetermined.

15. The infrastructure equipment as claimed in claim 9 , wherein the repeated number of times of transmission of each sub-unit is different for different repetition cycles.

16. The infrastructure equipment as claimed in claim 9 , wherein an order of transmission of the sub-units within the first repetition cycle is different to an order of transmission within one or more of the subsequent repetition cycles.

17. An infrastructure equipment as claimed in claim 9 , wherein the sub-units in each repetition cycle are scrambled before transmission, the sub-units in one repetition cycle having a different scrambling sequence applied to them during the scrambling than sub-units in a subsequent repetition cycle.

18. The infrastructure equipment as claimed in claim 9 , wherein data symbols of the sub-units in each repetition cycle are precoded by multiplying the data symbols with a weighting vector before transmission from the antenna ports of the transmitter, the sub-units in one repetition cycle having a different weight vector than sub-units in a subsequent repetition cycle.

19. A method of controlling communications at an infrastructure equipment of a mobile communications network configured to transmit signals to and/or receive signals from a communications device in accordance with a wireless access interface, the method comprising

dividing an encoded transport block of data into a plurality of sub-units for transmission in a plurality of the time-divided units and one or more of the frequency resources of the wireless access interface allocated to the communications device,

transmitting each sub-unit a repeated number of times within a repetition cycle, wherein a first sub-unit of the plurality of sub-units being transmitted a first repeated number of times and a second sub-unit of the plurality of sub-units being transmitted a second repeated number of times, Therein the first and second repeated number of times are different, and

transmitting each sub-unit the repeated number of times in one or more subsequent repetition cycles, each sub-unit being transmitted the repeated number of times whereby the communications device can combine the same sub-unit within each repetition cycle to form a composite sub-unit for each of the repetition cycles for recovering; the transport block.