Patent ID: 6052385
Filing Date: 2000-04-18
Classification: H04B,H04L,H04W

Abstract:
A method for high-speed data transfer in a digital mobile communication system, the method comprising the steps ofestablishing a non-transparent data connection having a number of parallel subchannels allocated on the radio interface, said number being determined by a specific maximum transfer capacity;receiving user data from a terminal interface at a varying user data rate;transmitting user data over the non-transparent data connection in data frames by employing a communication protocol which acknowledges data frames received correctly and retransmits defective data frames;buffering data frames to be transmitted in a transmission buffer;storing the data frame transmitted in the transmission buffer for a possible retransmission until an acknowledgement is received from the receiving end;determining the actual user data rate on the terminal interface;determining a minimum number of subchannels, said number being determined by the actual user data rate;transmitting user data in data frames only via specific subchannels corresponding in number to said minimum number of subchannels;interrupting transmission or activating discontinuous transmission on each surplus subchannel allocated to the connection;monitoring fill level of the transmission buffer;continuing transmission or deactivating discontinuous transmission on at least one of said surplus subchannels if the transmission buffer fill level reaches a first threshold value; andinterrupting transmission or reactivating discontinuous transmission on at least one of said surplus subchannels if the transmission buffer fill level decreases to a second threshold level.