A method for radio transmission in a radio cell of an alarm system uses a time slot for communication between users or with a radio cell central unit that is subdivided into a first main area and a second main area. At least two of the users send routine signals to the radio cell central unit within the first main area, before detector data is transferred to the radio cell central unit or to another user in the second main area. This enables more users to be operated in the radio cell, with the reaction time remaining the same and lower power consumption of the peripheral elements.