US 6,983,140 B2 | ||
Portable mobile unit | ||
Kazutoshi Higuchi, Oomiya (Japan) | ||
Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
Filed on Apr. 27, 2001, as Appl. No. 9/842,913. | ||
Claims priority of application No. 2000-321918 (JP), filed on Oct. 17, 2000. | ||
Prior Publication US 2002/0045445 A1, Apr. 18, 2002 | ||
Int. Cl. H04M 11/00 (2006.01) |
U.S. Cl. 455—421 | 5 Claims |
1. A portable mobile unit comprising:
a receiver circuit for receiving a downlink signal from a base station,
a signal demodulator for dividing an output from said receiver circuit into a communication signal and a control signal,
a control processor operative for receiving said control signal, and
a transmitter circuit for amplifying and modulating an output signal to be transmitted as an uplink signal from an antenna,
wherein:
said control signal contains an intensity control signal to control the intensity of said uplink signal, and
said control processor generates an alarm associated with the uplink signal in response to receipt of an intensity control
signal included in the control signal for maximizing the intensity of said uplink signal while said downlink signal is normally
received.
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