Telecommunications – Carrier wave repeater or relay system – Plural modulated carriers
Patent
1985-11-13
1987-07-21
Ng, Jin F.
Telecommunications
Carrier wave repeater or relay system
Plural modulated carriers
455 32, 455 34, 455 77, 379 63, H04B 714, H04B 100
Patent
active
046823670
ABSTRACT:
Cooperation between two repeater transceivers of a radio trunking system causes a mobile radio transceiver to join or rejoin ongoing communications. To join ongoing communications, a radio transceiver attempts to acquire a free repeater communications channel by transmitting call signalling identifying a group of transceivers to be contacted. If the group to be contacted is already communicating on another repeater communications channel, the calling radio transceiver is forced to leave the communications channel it is trying to acquire and to begin scanning communications channels in search of call signalling identifying it. Meanwhile, the repeater permitting the ongoing communication interrupts the ongoing communications briefly and transmits the call signalling identifying the group of transceivers to be joined (including the radio transceiver which is to join the ongoing communications). The radio transceiver to be joined detects the call signalling transmitted by the repeater, locks onto the repeater channel over which the call signalling is being transmitted, and joins the ongoing communications. Land line callers are also permitted to join ongoing communications.
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Childress Jeffery S.
Dissosway Marc A.
Hughes, III Houston H.
General Electric Company
Ng Jin F.
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