Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Yoshihiro Kanomata

Kazutoshi Higuchi

Yasuaki Takahara

Yoshiaki Hasegawa

Hiroyuki Tomihara

Arata Nakagoshi

Shinya Oota

Akihiro Saito

Tomoya Uchiike

A receiver of a wireless base station that uses a simple mode to detect a failure is provided, and an SWswitches whether an input port of the receiveris to be connected with an antennaor to be terminated. An LNA (a low noise amplifier)amplifies an input signal with a low distortion. SWsandswitch between a first path which runs through the LNAand a second pathwhich does not run through the LNA. An AGC AMP, the gain of which is controlled such that the output thereof is constant, amplifies the signal with the controlled gain. A base station control section uses the SWto terminate the input port of the receiver so that thermal noise is input to the LNA. Further, the SWsandare changed over to determine the normality of the receiver based on the fact that a first gain of an AGC-AMPwhen connected to the first path, a second gain of the AGC-AMPwhen connected to the second path, and a difference between the first and second gains fall within their respective predetermined ranges.

Base station, receiving apparatus, and receiver trouble diagnosing method

The normality verification and radio characteristics test of a radio communication system are executed. RF-SWs (radio-frequency coaxial switches) change-over the paths of signals which are transmitted to and received from an access terminal function portion included in an access point. RF-SWs connect the access terminal function portionwith a desired one of radio analog portions. A test function controller controls the changeover operations of the RF-SWs in accordance with information designated by a maintenance apparatus (OMC). An access point controller controls in accordance with received test sort information, one or more of (1) an antenna failure test, (2) a receiver failure test, and (3) a transmitter failure.

Radio access point testing method and testing apparatus

The normality verification and radio characteristics test of a radio communication system are executed. RF-SWs (radio-frequency coaxial switches) change-over the paths of signals which are transmitted to and received from an access terminal function portion included in an access point. RF-SWs connect the access terminal function portion 122 with a desired one of radio analog portions. A test function controller controls the changeover operations of the RF-SWs in accordance with information designated by a maintenance apparatus (OMC). An access point controller controls in accordance with received test soil information, one or more of (1) an antenna failure test in which a voltage surface wave ratio is evaluated on the basis of the transmission power of the access terminal function portion, (2) a receiver failure test in which, after a packet error rate has been adjusted, a reception sensitivity is evaluated based on the transmission power of the access terminal function portion, and (3) a transmitter failure test in which transmission power from any of the radio analog portions is evaluated based on the reception power value of the access terminal function portion.

A cellular mobile telephone system including a cellular mobile telephone apparatus and a peripheral apparatus communicating bidirectionally. The cellular mobile telephone apparatus may include: a modulating/demodulating device demodulating radio frequency signals into a digital signal including a control signal; a controlling device controls operation of the cellular mobile telephone apparatus in accordance with the control signal; a first communicating device performs bidirectional communication, including transmitting a first control information controlling operation of the peripheral apparatus. The peripheral apparatus may include: an inputting device for inputting a second control information; a second communication device performing bidirectional communication with the cellular mobile telephone apparatus; and a control device controlling operation of the peripheral apparatus in accordance with the first control information, and performing control of the cellular mobile telephone apparatus through the communication device according to the second control information for changing a mode of the cellular mobile telephone apparatus.

Cellular mobile telephone apparatus and an alarm device therefor

A cellular mobile telephone apparatus including a main body, and an alarm device which is provided separately from the main body, the main body including: receiving/transmitting unit for receiving and transmitting radio frequency signals between a base station; modulating/demodulating unit for modulating and demodulating between the radio frequency signals, and a conversation signal and a control signal; telephone receiver unit for reproducing audible conversation voice in response to the demodulated conversation signal from the modulating/demodulating unit; telephone transmitting unit for converting conversation voice into the conversation signal; a controller for controlling operation of the main body of the cellular mobile telephone apparatus in accordance with the control signal; and an alarm device for providing an alarm signal which includes an identification information and is transmitted through the radio frequency, when a call is terminated at the main body; and the alarm device including: receiving unit for receiving the alarm signal of radio frequency; a discriminator for discriminating the alarm signal assigned to itself from others by the identification information included therein; and an alarm unit for alarming call termination in response to the identification by the discriminator.

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Yokohama, Japan

Yoshihiro Kanomata