Wireless data transmission apparatus, wireless data reception apparatus and methods

A data receiving device, the data receiving device comprising

• a receiver configured to receive a first plurality of blocks transmitted by a data transmitting device using first communications resources of a wireless access interface,
• a transmitter configured to transmit signals representing acknowledgement indications, and
• a controller, configured to control the transmitter and the receiver so that the data receiving device is operable:
• to determine that at least one of the first plurality of blocks was not received correctly,
• in response to determining that at least one of the first plurality of blocks was not received correctly, to transmit to the data transmitting device a first negative acknowledgement (NACK) indication indicating that at least one of the first plurality of blocks was not received correctly, the NACK indication not indicating which of the first plurality of blocks was not received correctly,
• to receive a subset of the first plurality of blocks retransmitted by the data transmitting device in response to the NACK indication using second communications resources, and
• after receiving the subset of the first plurality of blocks, to determine whether all of the first plurality of blocks have been received correctly.