Individual communication system selection method for group services

In a network of communication systems that comprises a plurality of communication systems, a central controller that interfaces with the plurality of communication systems and at least one operator station, wherein each communication system includes a plurality of communication units that are arranged into communication groups, a limited number of communication resources that are transceived via a limited number of repeaters, and a communication resource allocator that allocates via the central controller the limited number of communication resources among the plurality of communication units, a method that allows the operator station to individually select communication systems for communication group services, the method comprises the steps of:

• a) for a particular communication group, selecting, by the operator station, a communication group service for the particular communication group and selecting at least one communication system;
• b) transmitting, by the operator station, the at least one selected communication system and an identification of the particular communication group to the central controller;
• c) determining, by the central controller, whether at least one communication unit of the particular communication group is registered in the selected communication system;
• and
• d) when at least one communication unit of the particular communication group is registered in the selected communication system, assigning, by the central controller, a communication resource in the selected communication system to the operator station when a communication resource is available in the selected communication system, wherein the selected communication group service is performed.