Radio telephone apparatus

Details Radio telephone apparatus Radio telephone apparatus

1988-09-21

1991-02-26

Olms, Douglas W.

Telecommunications

Transmitter and receiver at separate stations

455 54, 379 60, 379 63, H04Q 704

Patent

active

049967150

ABSTRACT:
Radio telephone apparatus for use in a cellular mobile telephone system comprises means for alarming at least a user operating the apparatus in response to a drop in signal strength of radio frequency signals received over an established communication channel when the apparatus approaches a boundary of service area in a cellular mobile telephone system. The signal strength is repetitively checked to determine if it has fallen below a first predetermined signal strength value. When the signal strength falls to or below a second predetermined signal strength value, the radio telephone apparatus causes a disconnection of the telephone link and returns the apparatus to a standby mode.

REFERENCES:
patent: 4032723 (1977-06-01), Mendoza
patent: 4475010 (1984-10-01), Huensch et al.
patent: 4593273 (1986-06-01), Narcisse
patent: 4761806 (1988-08-01), Toki
patent: 4775995 (1988-10-01), Chapman et al.
patent: 4802201 (1989-01-01), Yoshizawa et al.

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