a method for controlling the distribution of transmission rates in a cellular radiotelecommunication system wherein , in order to support the effective utilization of types of time slot in wireless telecommunication systems , e . g . the dect - specific “ full ” or “ double slots ”, two fixed parts are provided for each radio cell . the first fixed parts in each case support two types of time slot but signal in dependence on the capacity utilization of the second fixed parts , which only support one type of time slot , that they support the second or the first and second type of time slot . the portable parts store the fixed parts , after they have signaled their support of types of time slot , in separate lists .