Patent ID: 7443830

Claim:
A method of data communication over transmission channels between a central base station (BS) and a plurality of mobile subscriber stations (M) in a mobile radio communication system, wherein a downlink transmission channel is divided into a plurality of frames each comprising a plurality of time slots of a constant length, whereas an uplink transmission channel is divided into a plurality of frames each comprising a plurality of time slots of a variable length, and access to the transmission channel uses a time division multiple access (TDMA) scheme, and wherein the BS and a specific M support a plurality of methods of coding and/or modulating a payload for transmission over the transmission channel, the method being for selecting the coding and/or modulating method, and comprising the steps of: detecting a load of the transmission channel; and selecting, for each time slot, the coding and/or modulating method in dependence upon the detected load, wherein the combination of coding and/or modulation is determined individually for each time slot of one downlink frame.