Patent ID: 6985470

Claim:
A data transmission method in a digital telecommunication system including a mobile station, a radio access network element, a network adapter, a radio interface using channel coding and radio frames between the mobile station and the radio access network element, and a network interface between the radio access network element and the network adapter, the method comprising: placing information units to be transmitted in radio frames of a lower protocol in the radio interface; transmitting the radio frames over the radio interface; and separating said information units from the radio frames received over the radio interface; wherein the placing of information units comprises: transmitting 38.4 kbit/s of user data in 14.4 kbit/s transmission frames via three 16 kbit/s channels at the network interface, every ninth transmission frame being a dummy frame; providing 20-ms radio frames with phase indication which is modulo N, wherein N>3; placing the information contents of N1 transmission frames in each modulo N radio frame sequence, wherein N1>8; placing filler bits at the end of the last radio frame N of each radio frame sequence; and wherein the method further comprises, at a reception end: identifying the phase of each modulo N radio frame sequence and the starting points of the transmission frames in the radio frames on the basis of said phase indication; separating N1 transmission frames from each radio frame sequence for further processing; and rejecting said filler bits.