Radio telephone apparatus
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United States of America Patent
Stats
-
Feb 26, 1991
Grant Date -
N/A
app pub date -
Sep 21, 1988
filing date -
Sep 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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