Mobile communication apparatus with a security function and a method of communicating with a base station with security

DETAILED DESCRIPTION The aim of the present invention is to provide an improved mobile communication apparatus and an improved method of communicating with a base station.
According to the present invention there is provided a radio communication apparatus which comprises: a radio wave signal communication circuit for receiving from and transmitting a radio wave signal to a base station; a communication circuit for providing communication to an operator through the radio wave signal receiving and transmission circuit; a speed detecting circuit for detecting a speed of the radio communication apparatus to the base station from an output of the radio wave signal communication circuit; a comparing circuit for comparing the detected speed with a reference; and a control circuit responsive to the comparing circuit for controlling the communication circuit when the detected speed exceeds the reference.
In the radio communication apparatus, the speed detecting circuit may comprise: a measuring circuit for measuring an electrostatic field intensity of the received radio wave signal in response to a timing signal; a storing circuit for repeatedly storing recent predetermined sets of output data from the measuring circuit; a variation detection circuit for detecting a variation in the recent predetermined sets of output data to generate a speed signal from the detected variation; and a timing control circuit for generating a timing signal in accordance with the speed signal.
In the radio communication apparatus, the communication circuit may further comprise a call detection circuit for detecting a call from the base station via the radio wave signal communication circuit, wherein the control circuit neglects the detected call when the detected speed exceeds the reference.
In the radio communication apparatus, the communication circuit may further comprise an operation circuit for receiving a dialing operation to make a call to the base station via the radio wave signal communication circuit, wherein the control circuit inhibits the communication circuit from making the call when the detected speed exceeds the reference