JP2718138B2 - Mobile phone equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone device used for a mobile subscriber terminal of a mobile phone system, and more particularly to a mobile phone device using a plurality of antennas having different gains. It is.

[Conventional technology]

There are several types of antennas used in this type of mobile telephone device, each having advantages and disadvantages. For example, a pull-out antenna has a high gain and is effective when it is far from the base station, but it needs to be pulled out when used, resulting in poor operability. In addition, the built-in antenna does not require any special operation when used, so that the operability is good, but the gain is low and there is a disadvantage that communication is difficult when the antenna is far from the base station.

For this reason, in general, this type of mobile phone device is provided with a plurality of antennas having different gains, such as a pull-out antenna and a built-in antenna, and is selectively used depending on the situation. For example, a built-in antenna is used in an area relatively close to the base station, and a pull-out antenna is used in an area relatively far from the base station.

FIG. 3 shows an example of the configuration of a conventional portable telephone device of the type described above, where 1 'is a pull-out antenna,
2 'is a built-in antenna. Also, a control unit 3 'for controlling each unit, a radio unit 4' for transmitting and receiving to and from the outside, an operation unit 5 'such as a keyboard for inputting a dial number and the like as function units, and a status display are shown. A display section 6 'such as an LCD (liquid crystal display element) to be performed and a switch 7' for switching an antenna are provided.

Thus, when the drawer-type antenna 1 'is housed (shown), the switch 7' is closed (ON), the built-in antenna 2 'is connected to the radio unit 4', and communication is performed by the built-in antenna 2 '. . When the drawer-type antenna 1 'is pulled up, the operator of the switch 7' is pushed by the lower step of the drawer-type antenna 1 'to open (OFF) the switch 7', and the built-in antenna 2 '
And the radio section 4 'are separated. Instead, the contact section C2 at the lower end of the pull-out type antenna 1' comes into contact with the contact section C1 on the radio section 4 'side, and the pull-out type antenna 1'
And the radio unit 4 'are connected, and communication is performed by the pull-out antenna 1'.

In such a conventional portable telephone device, the power radiated from the antenna at the time of transmission is constant since the power supplied from the radio unit 4 'is constant, so the gain of the antenna to be used, that is, in the example of FIG. It will vary depending on whether the type antenna 1 'or the built-in antenna 2' is used.

[Problems to be solved by the invention]

The conventional mobile phone device was configured and operated as described above, but had the following disadvantages because the power radiated from the antenna was not constant when antennas having different gains were used properly. .

In a mobile telephone system or the like in which the upper limit is set for the radiated power of the mobile subscriber terminal, the radiated power is set to match the antenna having a higher gain. The allowable radiation power cannot be used effectively.

It cannot be used in a mobile telephone system or the like that requires that the radiated power of a mobile subscriber terminal be constant.

The present invention has been proposed in view of the above points, and an object of the present invention is to provide a mobile phone device capable of generating a constant radiated power regardless of an antenna when a plurality of antennas having different gains are properly used. To provide.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a mobile phone device that uses a plurality of antennas having different gains, wherein: antenna identification means for identifying an antenna being used; transmission power according to an identification result of the antenna identification means; And transmission power control means for controlling the transmission power according to the gain of the antenna used.

[Action]

In the portable telephone device of the present invention, the antenna identifying means identifies the used antenna, and the transmission power control means uses the transmission power in accordance with the gain of the used antenna according to the identification result of the antenna identifying means. Control the transmission power.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing one embodiment of the mobile phone device of the present invention. In FIG. 1, in the present embodiment, a pull-out antenna 1, a built-in antenna 2, a control unit 3 for controlling each unit, a radio unit 4 for transmitting and receiving to and from the outside, and input operations such as a dial number. Operation unit 5 such as keyboard
, A display unit 6 such as an LCD for displaying a state, a switch 7 for switching an antenna, and a switch 8 for identifying an antenna.

Thus, antenna switching when using different antennas is performed as follows. That is, when the drawer-type antenna 1 is housed (the state shown in the drawing), the switch 7
(It is linked with the switch 8 as described later.) Is closed, the built-in antenna 2 and the radio unit 4 are connected, and communication is performed by the built-in antenna 2. When the drawer-type antenna 1 is pulled up, the drawer-type antenna 1
The operator of the switch 7 is pressed by the lower step, and the switch 7 is opened, and the built-in antenna 2 and the radio unit 4 are separated from each other. The contact portion C1 on the side of the unit 4 comes into contact, the pull-out antenna 1 and the wireless unit 4 are connected, and communication is performed by the pull-out antenna 1. The operation so far is the same as in the conventional example.

On the other hand, the switch 8 linked to the switch 7 has one end connected to the chassis ground (GND) and the other end connected to the input end of the control unit 3. Therefore, when the drawer-type antenna 1 is housed, the switch 8 is closed and the GND signal is given to the control unit 3, and when the drawer-type antenna 1 is pulled out, the switch 8 opens and the control unit 3 receives the GND signal. By monitoring this signal, the control unit 3 can identify whether the currently used antenna is the pull-out antenna 1 or the built-in antenna 2.

The control unit 3 controls the operation of each unit, and gives a signal (power control signal) for controlling the transmission power to the wireless unit 4 by, for example, a digital signal. Thus, the control unit 3 sets the transmission output of the radio unit 4 to a predetermined value according to the gain of each antenna according to whether the antenna used is the pull-out antenna 1 or the built-in antenna 2. Different power control signals depending on the type of antenna.

FIG. 2 shows a configuration example of a transmission power control unit in the radio unit 4, and a “power control signal” in the figure is a digital signal given from the control unit 3. In FIG. 2, a transmission power control unit includes a power amplification unit 41 that amplifies transmission power, and a power detection unit that sends out a part of a transmission signal to detect transmission power.
42, a detector 43 for detecting and rectifying the extracted signal to obtain a DC signal corresponding to the transmission power, a differential amplifier 44 for extracting an error signal between the signal voltage and the reference voltage, and a differential amplifier A power supply voltage control unit 45 that controls the power supply voltage of the power amplification unit 41 according to the output signal of the power supply unit 44, and a D / A conversion unit 46 that generates a reference voltage according to the power control signal given from the control unit 3 I have.

Thus, the power amplifying section 41 → the power detecting section 42 → the detecting section 43 →
Negative feedback control is performed by the loop of the differential amplifying unit 44 → the power supply voltage control unit 45 → the power amplifying unit 41, and the transmission power is controlled to a predetermined value according to the value of the reference voltage output from the D / A conversion unit 46. Become.

Therefore, when the pull-out antenna 1 is used, the power control signal whose value is changed so as to reduce the transmission output by the amount of canceling out the gain difference as compared with the case where the built-in antenna 2 is used is transmitted to the control unit 3. To the radio unit 4, and as a result, the transmission power from the antenna is kept constant. For example, the gain of the built-in antenna 2 is
If the gain is 2dB lower than the gain of the antenna, the transmission output will be 2dB when using the pull-out antenna 1 compared to when using the built-in antenna 2.
Control for lowering is performed. When the built-in antenna is used, control is performed to increase the transmission power, contrary to the above.

With the above operation, the radiated power output from the antenna during transmission can be kept constant.

〔The invention's effect〕

As described above, in the mobile phone device of the present invention, when a plurality of antennas having different gains are properly used, the antenna to be used is automatically identified, and control is performed so that a constant radiated power is obtained. Therefore, in a mobile telephone system or the like in which the upper limit is set for the radiated power of the mobile subscriber terminal, transmission can always be performed with the maximum allowable radiated power, and the maximum capability can be exhibited. Also, by using an antenna having a high gain, it is possible to improve only the reception sensitivity while keeping the radiation power constant. In this case, power consumption can be reduced as compared with an antenna having a low gain.

Even a mobile telephone system or the like that requires that the radiated power of the mobile subscriber terminal be constant can be used, and a plurality of antennas having different gains can be used as needed.

And so on.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the mobile phone device of the present invention, FIG. 2 is a configuration diagram of a transmission power control unit of a wireless unit in FIG. 1, and FIG. 3 is an example of a conventional mobile phone device. FIG. In the figure, 1 ... Pull-out antenna 2 ... Built-in antenna 3 ... Control unit 4 ... Wireless unit 41 ... Power amplification unit 42 ... Power detection unit 43 ... Detection unit 44 ... Differential amplification unit 45 ... … Power supply voltage control unit 46… D / A conversion unit 5… Operation unit 6… Display unit 7,8… Switch C1, C2… Contact unit

Claims (1)

(57) [Claims] 1. A portable telephone device which uses a plurality of antennas having different gains selectively, comprising: an antenna identifying means for identifying an antenna being used; and an antenna using transmission power according to an identification result of the antenna identifying means. Transmission power control means for controlling transmission power according to the gain of the mobile phone.