JPH0669166B2 - Mobile wireless terminal - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wireless terminal device, and more particularly to a mobile wireless terminal device having anti-theft measures.

(Prior Art) As mobile wireless terminal devices, mobile phone devices, car phone devices that can be carried out, mobile phone devices, and those capable of data communication are being put to practical use. All of these mobile radio terminal devices are capable of transmitting and receiving control signals for allocation of radio lines, etc. to and from a radio base station, but the power source is a battery provided in an automobile or the like. Alternatively, a small power source is built in the mobile radio terminal device, and all circuits can be put into an operating or non-operating state by turning on or off the main power switch.

(Problems to be Solved by the Invention) However, with the spread of wireless terminal devices, there is theft of a car equipped with a car phone, or theft of only a mobile wireless terminal device that can be carried out or portable, and a mobile wireless terminal device of another person. Is sometimes used as a tool for crime, so if you have theft, you need to find it as soon as possible.
In many cases, the power is turned on only when it is used and the power is turned off immediately to move the device, which causes a problem that it is not easy to search deep.

An object of the present invention is to have a power supply connection circuit capable of controlling power supply connection of some circuits when receiving a specific control signal from a wireless base station even when a main power switch is turned off,
Another object of the present invention is to provide a mobile wireless terminal device that facilitates tracking from a wireless base station or the like.

(Means for Solving Problems) The mobile radio terminal device of the present invention receives a specific first control signal from the radio base station when the main power switch is turned on and normal operation is possible. , In addition to the main power switch, a connection circuit that supplies power to the receiver, transmitter, and transmission / reception controller is formed, and when the operator turns off the main power switch, the operation unit that interfaces with the operator turns off. The power supplies of the receiving unit, the transmitting unit, and the transmission / reception control unit are on, and the wireless base station is in a state capable of transmitting / receiving necessary control signals. In this state, when the specific second control signal is received from the radio base station, the connection circuit is restored, the power is completely cut off, the power consumption is stopped, and the operation continues until the operator turns on the main power switch again. It has a configuration that does not become a state.

(Example) Hereinafter, the Example of this invention is described in detail with reference to drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, in which an antenna 1, a transmission / reception demultiplexer 2, a reception unit 3, a transmission unit 4, a transmission / reception control unit 5 and an operation unit 6 have the functions of each unit of a conventional mobile radio terminal device. In addition, by turning on the power, required communication can be performed with the wireless base station via the operation unit 6. In the power supply circuit of the present embodiment, the (−) side of the power supply 7 is directly connected to the (−) power supply input terminal of each of the functional units described above, but the (+) side of the power supply 7 is connected to the main power switch 8. One via the diode D1 and (+) for each of the receiver 3, transmitter 4, and transmission / reception controller 5.
Connected to the power input terminal, the other one is a diode
It is connected to the (+) power input terminal of the operation unit 6 without passing through D1. On the other hand, the (+) side of the power source 7 does not go through the main power source switch 8 but the make contact rl of the power source connecting relay RL.
Via a diode D2 via a diode (3), and connected to the (+) power supply input terminals of the receiver 3, transmitter 4, and transmission / reception controller 5. In addition to the normal control function, the transmission / reception control unit 5 is provided with output lines (S and R lines) that identify specific first and second control signals and generate outputs, respectively. The output line of is connected to the holding circuit 9. Although not shown, the power supply of the holding circuit 9 is also supplied from the transmission / reception control unit 5, and the output is supplied to the power supply connection relay RL.

With the above configuration, when the specific first control signal is received from the radio base station while the main power switch 8 is on, the main power switch 8 is included in the receiving unit 3, the transmitting unit 4, and the transmission / reception control unit 5. A power supply connection is formed through a make contact rl that does not go through, and the operator turns off the main power switch 8 to turn on the operation unit 6.
Even if the indicator of (1) is extinguished or the operation function is stopped, the radio base station still exchanges necessary control signals with the mobile radio terminal device. Therefore, the wireless base station or the like can easily search for the mobile wireless terminal device by using these control signals or their transmitted radio waves. Further, when the specific second control signal from the radio base station is received, the power connection relay RL is restored and all the power of this terminal device is turned off. However, if the operator turns on the main power switch 8 again. It can be used as usual at any time.

The specific first and second control signals have the same configuration as a control signal used in a mobile radio terminal device that receives a channel assignment of a radio channel from a normal radio base station, and are used for signal patterns that are not used. It can be easily made by using it.

Further, although the holding circuit 9 is easily composed of a flip-flop circuit and a relay drive circuit, these circuits are included in the transmission / reception control unit 5, and a common circuit provided in the transmission / reception control unit 5 is used instead of the flip-flop circuit. You can also

Furthermore, although the power supply connection relay RL is made of a relay, a switch element made of a semiconductor may be used instead of the relay. Also, the diode D1
Is to prevent the power supply from sneaking in, and the diode D2 is not necessarily required, but it is provided to reduce the fluctuation of the supply voltage. D2 can be excluded.

(Effects of the Invention) As described in detail above, according to the present invention, even if the main power switch is turned off, only the operation unit is powered off by the control from the radio base station, and the control with the radio base station is performed. Since signals can be transmitted and received, it becomes easy to track the location of the mobile radio terminal device from the base station or the like.

[Brief description of drawings]

The figure shows an embodiment of the present invention. 1 ... Antenna, 2 ... Transmit / receive demultiplexer, 3 ... Receiver,
4 ... Transmission unit, 5 ... Transmission / reception control unit, 6 ... Operation unit, 7
...... Power supply, 8 …… Main power switch, 9 …… Holding circuit, RL
...... Power supply connection relays, D1, D2 …… Diodes.

Claims (1)

[Claims] 1. A mobile radio terminal apparatus for transmitting and receiving a control signal to and from a radio base station, receiving a specific first control signal from the radio base station and holding the specific first control signal, and transmitting a specific second control signal. Holding means for receiving and releasing this holding, and connecting means for operating the output of the holding means and connecting the power source to the receiving section excluding the operating section, the transmitting section, and the transmission / reception control section through a path that does not pass through the main power switch And a mobile wireless terminal device.