Abstract: The invention relates to an arrangement for optimizing the data transmission over a bidirectional radio channel. According to the invention, the digital data to be transmitted according to a data transmission protocol is divided into individual data packets in each of two transmitting/receiving stations. In each transmitting/receiving station, the number and/or priority and/or type (e.g. information, control characters, repeat blocks) of the data packets generated by the data transmission protocol of the higher level and transmitted to the respective transmitter of the station is determined (data packet identifications). According to the data packet identifications, the data transmission protocol is then selected in at least one of the stations in accordance with an optimum utilization of the radio channel capacity.

Abstract: The arrangement is for optimization of data transmission via a bi-directional radio channel in which respective types of modulation can be selected at the transmitter side and the code rate of the forward error correction (FEC) as well as the power of the transmitter Devices (CRC) are provided at the reception side for determination of the error rate. The size of the data packets, and/or the type of modulation, and/or the code rate, and/or the power of the transmitter is varied, dependent on the error rate transmitted back, such that a predetermined error rate is achieved at the reception side.