Telecommunications – Transmitter and receiver at separate stations
Patent
1990-11-05
1993-01-12
Kuntz, Curtis
Telecommunications
Transmitter and receiver at separate stations
455 341, 455 671, 455 89, 455 561, 379 59, H04Q 700, H04B 138, H04B 1700
Patent
active
051797216
ABSTRACT:
In a geographic region that contains a trunking communication system and a cellular communication system, where the coverage area of each system substantially overlaps, a method that enables a communication unit to operate in either system is disclosed. Normally in accordance with the present invention, a communication unit will monitor a control channel of the cellular communication system. When the communication unit is needed within the trunking communication system, a communication channel controller of the trunking communication system will place a telephone call to the communication unit via the cellular communication system. The telephone call indicates to the communication unit that it should transfer its affiliation from the cellular communication system to the trunking communication system. Once the communication unit has transferred its affiliation to the trunking communication system, it operates as a trunking communication unit.
REFERENCES:
patent: 4802235 (1989-01-01), Treatch
patent: 5003629 (1991-03-01), Ness-Cohn et al.
patent: 5020093 (1991-05-01), Pireh
patent: 5058199 (1991-10-01), Grube
Comroe Richard A.
Grube Gary W.
Faile Andrew
Kuntz Curtis
Markison Timothy W.
Motorola Inc.
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