Method for radio transmission in an alarm signaling system

A method for radio transmission of messages in an alarm signaling system with a central station and a plurality of bidirectional and unidirectional subscribers, in which the central station and the bidirectional subscribers each feature a send and receive unit while the unidirectional subscribers merely possess a send unit and whereby the unidirectional subscribers located outside the radio coverage area of the destination of a message of the unidirectional subscriber, which as a rule is the central station, attempt to send messages via one of the bidirectional subscribers to the destination, comprising the steps of:

• assigning individual time slots to each bidirectional subscriber;
• receiving a message sent by a unidirectional subscriber by all bidirectional subscribers within its radio coverage area,
• waiting by each bidirectional subscriber that has received the message for said individually assigned timeslot to send a confirmation and/or to forward the message to a destination or to a central station;
• during a wait time, switching to receive by each bidirectional subscriber in order to monitor a radio channel to see if another bidirectional subscriber with a shorter wait time has already confirmed the message and/or forwarded it to the central station, and
• as soon as a subscriber receives a confirmation of the message or the fact that it has been forwarded, suppressing its own confirmation or forwarding of the message, wherein the order of the wait times and thereby the wait times of the bidirectional subscribers is defined by their address within the radio cell.