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.