A method of handling a data packet stream at different communication protocol layer levels of a communication protocol layer stack of an UMTS communication device is provided. The method comprises: Receiving a data packet stream at the communication device; Determining whether, in case of a loss of a data packet of the data packet stream, it is possible to retransmit the lost data packet to the communication device; and immediately transmitting data packets of the data packet stream succeeding the lost data packet from a MAC protocol layer level to a RLC protocol layer level if it is determined that the lost data packet cannot be retransmitted to the communication device, and otherwise storing data packets of the data packet stream succeeding the lost data packet for a third period of time at the MAC protocol layer level, which third period of time is longer than the second time period.