Method for a communication unit to operate in either a trunking

Telecommunications – Transmitter and receiver at separate stations

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Details

455 341, 455 671, 455 89, 455 561, 379 59, H04Q 700, H04B 138, H04B 1700

Patent

active

053718984

ABSTRACT:
A communication unit may operate in either a trunking communication system and a cellular communication system when the coverage areas of each system overlap. Typically, the communication unit is affiliated with the trunking communication system and operates normally therein. When a call is received or being placed via the cellular communication system, the communication unit transfers its affiliation to the cellular communication system and operates therein. The communication unit is prompted by the trunking communication system to transfer its affiliation for incoming calls and does so automatically for outgoing calls. Once the communication ends, the communication unit transfers its affiliation back to the trunking communication system within a predetermined period of time.

REFERENCES:
patent: 4347625 (1982-08-01), Williams
patent: 4553262 (1985-11-01), Coe
patent: 4802235 (1989-01-01), Treatch
patent: 4972455 (1990-11-01), Phillips et al.
patent: 5058199 (1991-10-01), Grube
patent: 5095529 (1992-03-01), Comroe et al.
patent: 5179721 (1993-01-01), Grube et al.

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