A mobile terminal device may include a radio processing circuit and a baseband processing circuit adapted to interact with the radio processing circuit. The mobile terminal device may be configured to transmit or receive a data sequence using a first channel and a second channel according to a data allocation ratio, wherein the data sequence is allocated between frequency division duplexing (FDD) transmission or reception and time division duplexing (TDD) transmission or reception according to the data allocation ratio, and concurrently to transmitting or receiving the data sequence, recurrently adjust the data allocation ratio to re-allocate the distribution of the data sequence between FDD transmission or reception and TDD transmission or reception on the first channel and the second channel.