Radio telephone apparatus

Details Radio telephone apparatus Radio telephone apparatus

1991-02-25

1992-07-28

Esienzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 541, 455 677, 379 63, A04Q 702

Patent

active

051347083

ABSTRACT:
Radio telephone apparatus for use in a cellular mobile telephone system includes an alarm to inform a user of a drop in signal strength of radio frequency signals received over an established communication link. Such a drop occurs, for example, when the user is approaching the boundary of a service area. Further, the mobile unit detect the presence or strength of a tone signal modulated on at least one of the received radio signals. The mobile unit disconnects the telephone link and returns to the standby mode if the tone signal is lost or becomes too weak.

REFERENCES:
patent: 4032723 (1977-06-01), Mendoza
patent: 4475010 (1984-10-01), Huensch et al.
patent: 4573206 (1986-02-01), Grauel et al.
patent: 4593273 (1986-06-01), Narcisse
patent: 4736453 (1988-04-01), Schloemer
patent: 4761806 (1988-08-01), Toki
patent: 4775995 (1988-10-01), Chapman et al.
patent: 4802201 (1989-01-01), Yoshizawa et al.
patent: 4850033 (1989-07-01), Eizenhofer et al.
patent: 4939766 (1990-07-01), Umemoto et al.
patent: 4996715 (1991-02-01), Marui et al.

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