A portable communication device includes a base, an intermediate portion and a top portion that are operatively coupled by a combination hinge assembly. To minimize the number of bits required for a residual block, quantized transform coefficients are adaptively divided into a plurality of subsets according to a size of a transform block, and non-zero quantized transform coefficients of each subset are scanned and encoded. Further, the method can prevent interruption of communication due to authentication or security during a handover of a UE between Public Land Mobile Networks. The data retransmission rate can also be based on the actual channel condition at the time of the first transmission plus the condition of the channel before or during the transmission of the NACK. Thus, a mapping is performed and different processing capabilities are used on different portions of the data connection.