Telecommunications – Carrier wave repeater or relay system – Plural modulated carriers
Patent
1979-03-12
1982-11-23
Ng, Jin F.
Telecommunications
Carrier wave repeater or relay system
Plural modulated carriers
455 32, 455 34, 455 54, 455 78, H04B 714, H04B 100, H04B 144
Patent
active
043609279
ABSTRACT:
Arrangement for establishing communication between a first mobile radio station and a second mobile radio station through a repeater over a radio frequency channel selected from a plurality of such channels. In an idle mode, a mobile station searches the channels for a predetermined group signal identifying it as belonging to a particular group of mobile stations. When that predetermined group signal is received on a channel, the mobile station is enabled on that channel so that it can communicate with a call originating mobile station belonging to the same group. In a call originate mode, a mobile station searches for an idle or unused channel identified by the absence of a busy signal. When an idle channel is found, the call originating station transmits a busy signal. The repeater, hearing the busy signal, transmits an acquisition signal. This acquisition signal is detected by the call originating mobile station which thereafter transmits a predetermined group signal for enabling other mobile stations in the common group on that same channel.
REFERENCES:
patent: 3173966 (1965-03-01), Rypinski
patent: 3376509 (1968-04-01), Wilcox et al.
patent: 3535636 (1970-10-01), Muilwijk
patent: 3555424 (1971-01-01), Malm
patent: 3707679 (1972-12-01), Bruley et al.
patent: 3808537 (1974-04-01), Sarati et al.
patent: 4009442 (1977-02-01), Bromssen
patent: 4013958 (1977-03-01), Spayth
patent: 4125808 (1978-11-01), Graham
patent: 4129749 (1978-12-01), Goldman
Bowen William A.
Williams James W.
General Electric Company
Ng Jin F.
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