Telecommunications – Transmitter and receiver at separate stations
Patent
1994-04-19
1995-10-10
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 341, 455 561, H04B 100
Patent
active
054578094
ABSTRACT:
When a particular mobile station transmits a call out signal including a group number of the mobile station and the call out signal is received by a mobile exchange by way of a mobile base station, the mobile exchange determines whether or not a group number is included in the call out signal. When a group number is included, the mobile exchange transmits a paging signal to all of radio base stations having service areas in which a mobile station or stations of the group are present. Each radio base station receiving the paging signal searches for a mobile station of the group in response to the paging signal and waits paging a response signal or signals from a mobile station or stations thus searched out. When such paging response signals are received by the radio base stations and further by the mobile exchange, the mobile exchange searches out free audio channels for the mobile stations from which the paging response signals have been transmitted, and enables group communications with the sending side mobile station by way of the free audio channels.
REFERENCES:
patent: 4817190 (1989-03-01), Comroe et al.
patent: 5095529 (1992-03-01), Comroe et al.
patent: 5274837 (1993-12-01), Childress et al.
Eisenzopf Reinhard J.
Faile Andrew
NEC Corporation
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