Telecommunication devices and methods for performing data retransmission in a telecommunications system

A telecommunication device for communicating data in a wireless telecommunications system via a wireless interface, the wireless interface being provided by at least a first component carrier within a first frequency band and a second component carrier within a second frequency band, wherein the telecommunication device comprises:

• a link control module at a link control layer;
• and
• an access control layer module at an access control layer, the link control layer being at a higher layer than the access control layer, wherein
• the telecommunication device is configured to
• transmit, from the link control module to the access control layer module, a link control layer Packet Data Unit (PDU) for transmission;
• transmit first access control layer data using resources allocated within the first component carrier, wherein the first access control layer data corresponds to the PDU;
• identify that transmission of data for the PDU has been unsuccessful;
• and
• upon identification that transmission of data for the PDU has been unsuccessful, re-transmit, from the link control module, the PDU and cause the re-transmitted PDU to be transmitted via second access control layer data using resources allocated within the second component carrier.