Channel changing system

Details Channel changing system Channel changing system

1989-01-25

1990-12-04

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 59, 455 33, H04M 1100

Patent

active

049759396

ABSTRACT:
The present invention is a channel changing system in a mobile unit communication system comprising a plurality of radio base stations for communicating with movable stations through radio channels and a center station for accommodating such base stations and connecting these base stations with the public telephone network. The center station is configurated comprising a private branch exchanger for accommodating the public telephone network and the lines extending from a plurality of base stations and a controller for controlling changing of communication channels by supervising the signal receiving levels between a movable station and a plurality of base stations. The controller is configurated so that it issues a channel changing command by detecting, based on the signal receiving levels, that a movable station has transferred to the radio zone of an adjacent base station from the radio zone of a certain base station. The private branch exchanger conducts the line changing depending on the channel changing command through an extension transfer to the base station line of adjacent base station from the base station line of the relevant base station.

REFERENCES:
patent: 4658416 (1987-04-01), Tanaka
patent: 4740788 (1988-04-01), Konneker
patent: 4752951 (1988-06-01), Konneker

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