System and method for data size adaptation in a UE

A communication device comprising:

• a storing means for storing a plurality of Media Access Control (MAC)-d flows, wherein the MAC-d flows are stored in a plurality of lists based on type of grants associated with the MAC-d flows and availability of MAC-d PDU in the MAC-d flows in a current Transmission Time Interval (TTI);
• a processing unit for selecting an Enhanced Transport Format Combination (E-TFC) for a future TTI when a User Equipment (UE) is in the current TTI using a value of power offset associated with a MAC-d flow from the plurality of stored MAC-d flows and adapting an RLC PDU size for the future TTI using the selected E-TFC;
• a processing unit for generating the RLC PDUs for the future TTI using a factor, based on maximum variation in grant for the future TTI for the communication device, and the RLC PDU size adapted for the future TTI.

A User Equipment (UE) comprising:

• a memory for storing a plurality of Radio Link Control (RLC) Packet Data Units (PDUs);
• and
• a processing unit for determining a size of the RLC PDUs for a later Transmission Time Interval (TTI) based on an amount of data allowed in a current TTI, if the size of the RLC PDUs for the later TTI is flexible, and for generating the RLC PDUs for the later TTI using the determined size.