Importance

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Abstract

For establishing an expanded group call in a mobile communication system which has group call groups formed by a plurality of mobile stations, a network infrastructure which has at least one exchange, a plurality of base stations and telecommunication connections between them, and a group call database for maintaining data concerning group calls, an expanded group call set-up facility concerning a first group call group is activated in the group call database, the facility expanding the group call o concern at least one other group call group. The network infrastructure receives a group call set-up request concerning the first group call group, the network infrastructure checks whether an expanded group call setup facility has been activated for the first group call group, calls the mobile stations of the first group call group and the mobile stations (404) of each at least one other group call group to the expanded group call to be established, and guides the respective mobile stations to communicate on one traffic channel at each base station of the expanded group call.

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First Claim