JPH11252653A - Portable communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inconvenience caused by a drop of a battery voltage due to the use of a portable telephone terminal in the case that the energy of a charging battery supplying a drive power to the portable telephone terminal is comparatively low. SOLUTION: In the case that a battery voltage of a charging battery 371 is low enough not to apply a minimum required voltage to the portable telephone terminal when it receives an incoming call and a vibrator 374 and a transmission system 200 are operated simultaneously, a time base circuit 304 is controlled to change a transmission timing signal TX to decrease the transmission rate and to provide non-transmission periods. A vibrator control signal is generated to operate the vibrator 374 only for the non-transmission period when the transmission timing signal TX is inactive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a portable communication terminal such as a portable telephone terminal.

[0002]

2. Description of the Related Art In recent years, portable telephone terminals and simple portable telephone terminals called PHS (Personal Handy Phone System) have been widely used. These mobile telephone terminals can connect to a communication line with a destination via a base station to make a call.

FIG. 6 shows an example of a channel configuration between a base station and a portable telephone terminal. The base station notifies the mobile phone terminal of the type of the carrier of the base station, the service supported by the base station, and the like on the broadcast channel 2 in the downlink control channel 1. When the base station calls a mobile phone terminal, paging channel 3 is used. When the mobile terminal makes a call, the base station is notified by the access channel 5 of the uplink control channel 4. When information from the mobile phone terminal is notified to the base station, the uplink control channel 4 is used. The call uses the call channel 6.

[0004]

In the case of a portable telephone terminal, a rechargeable battery is generally used as a driving power source. FIG. 7 shows the voltage characteristics of a rechargeable battery used in a mobile phone terminal. In FIG. 7, 1.0C
Indicates a fully charged state, 0.5C, 0.2C,
This shows a state in which the energy stored in the order of 0.1 C is decreasing. As can be seen from FIG.
Rechargeable batteries, when the stored energy is low,
Even if the same current is taken out, the voltage drops.

[0005] In the case of a portable telephone terminal, during standby reception, power consumption is reduced by performing intermittent reception or the like.
To notify the user of the incoming call, the vibrator is vibrated, a ringing tone is emitted, or an LED (light emitting diode) is turned on. Also in this case. A control signal is also transmitted from the mobile phone terminal to the base station, such as notifying the base station that the call is being made.

That is, when an incoming call arrives at the mobile phone terminal and a traffic channel is connected between the base station and the mobile phone terminal, a vibrator or the like of the mobile phone terminal is driven in that state, and The transmission timing signal TX is turned on to transmit a control signal to the base station, and a driving current is supplied to the transmission system of the mobile phone terminal.

For this reason, as shown in FIG. 8, the maximum current is the total current Itx + v of the current Itx when the transmission timing signal TX of the portable telephone terminal is on and the current Iv when the vibrator is on. Referring to FIG. 7, when the transmission timing signal TX of the mobile phone terminal is turned on and the driving current is merely supplied to the transmission system, the driving current is also supplied from the rechargeable battery in the state of 0.1 C. However, the operable voltage of the mobile phone terminal is not divided.

However, when the vibrator or the like is driven, the maximum current is the current It when the transmission timing signal TX is turned on.
When the x + vibrator reaches the on-state current Iv, the rechargeable battery can be used only up to the state of 0.2C.
Below that, the voltage from the rechargeable battery will break the operable voltage. In this case, the power of the mobile phone terminal is turned off as soon as the truck channel is connected and the vibrator starts to sound. This is not limited to a vibrator, and the same can be said for a case where a device such as an LED, through which a large current flows, is driven.

In view of the above, the present invention provides a portable communication system capable of preventing inconvenience occurring due to a decrease in battery voltage when the energy of a rechargeable battery supplying a driving power supply is relatively low. The purpose is to provide a terminal.

[0010]

In order to solve the above-mentioned problems, a portable communication terminal according to the first aspect of the present invention comprises a transmission rate changing means for variably changing a transmission data rate, and a battery for supplying driving power. Battery voltage detecting means for detecting a battery voltage; determining means for determining whether the battery voltage detected by the battery voltage detecting means is lower than a predetermined voltage; and When it is determined that the voltage of the battery to be supplied is lower than a predetermined voltage, and when there is an incoming call, the transmission rate changing means is controlled to lower the transmission data rate so that the non-transmission section Transmission data rate control means for providing an incoming call notification, and incoming call notification control means for operating an incoming call notification means for notifying a user of an incoming call in the non-transmission section. It is characterized in.

According to the portable communication terminal of the present invention, the battery voltage of the battery supplying the driving power is detected by the battery voltage detecting means, and the determining means is determined based on the detected battery voltage. Thus, the battery voltage of the battery is
It is determined whether the voltage is lower than a predetermined voltage.

[0012] The battery voltage of the battery is increased by the discriminating means when the incoming call notification means such as a vibrator is operated at the time of an incoming call.
In the case where it is determined that the voltage is not large enough to supply a voltage that can operate normally to each unit, and when there is an incoming call, the transmission data rate control unit controls the transmission rate change unit. , The transmission data rate is kept low, and a non-transmission section is provided.

[0013] In the non-transmission section, the incoming call notification means is controlled by the incoming call notification control means to operate. That is, the transmission of data and the operation of the incoming call notifying means are not duplicated, and both are executed at the same time, so that the battery voltage obtained from the battery does not fall below the necessary minimum. Thus, the incoming call notifying unit is operated because the incoming call is detected, but the power consumption is increased, and it is possible to prevent the power supply of the portable communication terminal from falling and becoming inoperable.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a portable communication terminal according to an embodiment of the present invention;

FIG. 1 is a block diagram for explaining a portable telephone terminal according to this embodiment. The mobile phone terminal according to the present embodiment is roughly divided into a receiving system 100, a transmitting system 200, a CPU 360, a ROM 363, and a RAM 362.
It is provided with a microcomputer including In the mobile phone terminal of this embodiment, the driving power is supplied from a rechargeable battery 371. Further, a vibrator 306 is provided so that a user can be notified of an incoming call by vibration. Less than,
The configuration and operation of the mobile phone terminal of this embodiment will be described in detail.

The signal from the base station received by the antenna 301 is separated from the transmission signal by the duplexer 302, supplied to the low noise amplifier 101, amplified there, and then supplied to the mixer 102. The mixer 102 separates only a signal of a specific frequency and supplies it to the IF amplifier 103 to amplify the signal. An output from the IF amplifier 103 is subjected to quadrature demodulation by a quadrature mixer 104, supplied to an A / D converter 105, and converted into a digital signal.

The digital signal from the A / D converter 105 is demodulated by the demodulator 105, and
The error is corrected at 07. Of the digital signal after error correction, the control message is sent to the CPU 360, and the audio data is sent to the audio decoder. The audio data is decompressed by the audio decoder 108 and converted to an analog signal by the D / A converter 109. This analog audio signal is amplified by the amplifier 110 and is emitted through the speaker 111.

The transmission sound is picked up by a microphone 201, amplified by an amplifier 202, supplied to an A / D converter 203, and converted into a digital sound signal. The digital audio signal from the A / D converter 203 is supplied to an audio encoder 204, where the digital audio signal is compressed, and then supplied to a channel encoder 205.

The channel encoder 206 includes a CPU 3
The control message from the audio encoder 205 is combined with the digital audio signal from the audio encoder 205, and an error correction code is added to form a signal for transmission.
06. The signal for transmission is modulated by the modulator 206 and converted into an analog signal by the D / A converter 207. This analog signal is output to the quadrature mixer 2
08, is converted into an IF frequency (intermediate frequency) signal.
The signal is amplified by the F amplifier 209. The frequency of the amplified signal is further increased by the mixer 210 and the power amplifier 21
1 and is amplified by the antenna 301 through the duplexer 302.
Sent from

In the portable telephone terminal according to the present embodiment, CPU 360 has a function as a control unit for controlling each part of the portable telephone terminal.
ROM storing a program to be executed in 60
363, a RAM 362 used as a work area, and an EEPROM 3 in which data such as a speed dial is stored.
Reference numeral 61 denotes a connected microcomputer. Also,
The CPU 360 includes a key operation unit 364 provided with a numeric keypad for receiving an instruction input from a user, an LCD, and the like.
(Liquid crystal display) 365 is connected.

In FIG. 1, the synthesizer 303
In accordance with the control of PU 360, the frequency of the signal to be received is instructed to mixer 102 and IF amplifier 103, and the signal transmitted from the mobile phone terminal of this embodiment to mixer 210 and IF amplifier 209. Specify the frequency of

The time base circuit 304 controls the reception timing and the transmission timing of this embodiment. The mobile phone terminal according to this embodiment can change the transmission data rate of the data to be transmitted, and the transmission rate can be controlled by the transmission timing signal TX from the time base circuit 304. It has been like that.

FIG. 2 is a diagram showing an example in which a variable data rate is realized. In the mobile phone terminal according to this embodiment, as shown in FIG. 2A, the transmission timing signal TX is always turned on at the full rate. On the other hand, when the transmission rate is lowered, it is realized by changing the transmission time without changing the transmission power.

FIG. 2B shows an example of the transmission timing signal TX when the transmission rate is reduced to half, and FIG.
HA shows an example of a transmission timing signal TX when the transmission rate is reduced to ４. Also, FIG. 2 (D)
An example of the transmission timing signal TX when the transmission rate is reduced to 1/8 is shown.

As described above, the portable telephone terminal according to the present embodiment can control the transmission system 200 in accordance with the transmission timing signal TX from the time base circuit 304 to make the transmission rate variable. I have. Note that FIG.
, The horizontal axis is time, and the time per memory is 125 milliseconds.

Further, as described above, the portable telephone terminal of this embodiment includes vibrator 374 for incoming call notification and receives supply of driving power from rechargeable battery 371. The drive power from the rechargeable battery is supplied to each unit of the mobile phone terminal of this embodiment by a power supply circuit 372.

Further, the portable telephone terminal according to the present embodiment
The battery voltage of the rechargeable battery 371 is detected by the A / D converter 373, and the detected voltage is converted into digital data by the CPU.
360 can be notified. Thus, when the battery voltage of the rechargeable battery 371 decreases, the user can be notified of the decrease and prompted to charge the battery.

As described above, the mobile phone terminal of this embodiment can change the transmission rate. Therefore, when the battery voltage of the rechargeable battery is low and there is an incoming call to the own device, a control signal or the like indicating that the call is being transmitted to the base station and the like is transmitted at a reduced transmission rate. When a control signal is not transmitted, a vibrator for notifying an incoming call is driven. As a result, the transmission system 200 and the vibrator 374 are prevented from being driven at the same time, and the battery voltage of the rechargeable battery 371 can be prevented from being reduced, and the power of the mobile phone terminal can be prevented from being dropped. ing.

[Explanation of Principal Parts] For this reason, the portable telephone terminal according to the present embodiment transmits a vibrator control signal for operating vibrator 374 to an on / off state of a transmission state, a rechargeable battery, Is formed on the basis of the charging state and the request for turning on / off the vibrator.

That is, ON / OFF of the transmission state can be known from the transmission timing signal TX formed by the time base circuit 304 for controlling the transmission rate and the like as described above. Also, the CPU 360
Based on the notification of the incoming call from the base station, vibrator 37
4 for operating vibrator request signal VR
The vibrator request signal VR makes it possible to know a request for turning on / off the vibrator.

CPU 360 also provides power save signal PSV for notifying the state of the battery voltage based on the battery voltage information of rechargeable battery 371 from A / D converter 373.
Can be formed, and the state of charge of the rechargeable battery can be known. In this embodiment, the power save signal PSV is a signal that is turned on when the state of charge of the rechargeable battery described with reference to FIG. It is.

As described above, when the necessary minimum voltage (minimum drive voltage) cannot be supplied to the portable telephone terminal, the voltage of the rechargeable battery 371 is low and the vibrator 37
4 and the transmission system 200 are simultaneously driven. To prevent this, the transmission system 200 and the vibrator 37
4 is not required to be driven at the same time. Therefore, as shown in FIG.
R, transmission timing signal TX, and power save signal P
Based on the SV, a vibrator control signal is formed.

FIG. 3 shows the configuration of the vibrator request signal V
R, transmission timing signal TX, power save signal PSV
FIG. 6 is a diagram showing a relationship between each signal of FIG. As shown in FIG. 3, when the vibrator request signal is off, the vibrator control signal is turned off regardless of the state of the transmission timing signal TX and the power save signal PSV.

When the power save signal PSV is off, the on / off of the vibrator control signal is set to be the same as the on / off of the vibrator request signal VR. When the power save signal PSV is on and the vibrator request signal VR is on, the on / off of the vibrator control signal is made opposite to the on / off of the transmission timing signal TX.

It suffices to form a vibrator control signal so as to satisfy FIG. To realize this, the mobile phone terminal according to the present embodiment includes an OR gate circuit 305 based on a transmission timing signal TX, a vibrator request signal VR, and a power save signal PSV.
The vibrator control signal is formed using the AND gate circuit 306.

That is, in the portable telephone terminal of this embodiment, as shown in FIG. 1, the inverted signal of the transmission timing signal TX from the time base circuit 304 and the power save signal PSV are transmitted to the O gate R circuit 305. Supplied. The output signal of the OR gate circuit and the vibrator request signal VR are supplied to an AND gate circuit 306, and the output of the AND gate circuit 306 becomes a vibrator control signal.

Therefore, from the OR gate circuit 305, an output signal is obtained which is turned off only when the transmission timing signal TX is on and the power save signal PSV is off, and otherwise turned on. And AN
From the D gate circuit 306, a vibrator control signal which is turned on when the output signal from the OR gate circuit 305 is on and the vibrator request signal is on, and turned off otherwise is obtained.

Accordingly, the vibrator request signal VR is turned on from the AND gate circuit 306, and
A vibrator control signal that is off when the power save signal PSV is off, the vibrator request signal VR is on, the transmission timing signal TX is off, and the power save signal PSV is on, and is on otherwise. Can be formed.

FIG. 7 is a diagram showing a current waveform when the power save signal PSV is on in the portable telephone terminal of this embodiment. As shown in FIG. 7, when the charge state of the rechargeable battery 371 is poor and the power save signal PSV is turned on, and there is an incoming call to the mobile phone terminal of this embodiment, as described above, OR gate circuit 3
05. A vibrator control signal that is turned on only when the transmission timing signal TX is off is formed by the AND gate circuit 306, so that the transmission system 200 and the vibrator 374 operate alternately.

As a result, the transmission system 200 and the vibrator 374 operate at the same time, the maximum current increases, the battery voltage of the rechargeable battery 371 drops below the minimum drive voltage, and the power of the portable telephone terminal drops. Can be prevented.

Next, on / off control of the transmission timing signal TX, the power save signal PSV, and the vibrator request signal VR in the portable telephone terminal of this embodiment will be described with reference to the flowchart of FIG.
The processing shown in FIG. 5 is performed every time the transmission data rate in the audio encoder 204 is determined (for each frame).
Is executed by the CPU 360.

First, CPU 360 determines whether or not there is an incoming call to its own device and whether or not there is an incoming call notification request (step 5).
01). If it is determined in step 501 that there is an incoming call notification request, the CPU 360 sets the A / D
Based on the data from converter 373, it is determined whether the battery voltage of rechargeable battery 371 is lower than predetermined voltage V2 + α (step 502). Where α
Is for avoiding the influence of the variation of the voltage V2.
A positive value, for example, 0.2V.

In the determination process of step 502, the battery voltage of the rechargeable battery 371 is changed to a predetermined voltage V2 +
If it is determined that the transmission data rate is lower than α, the CPU 360 controls the time base circuit 304 to reduce the transmission data rate of the
(Step 50).
3). The processing in step 503 is performed by changing the transmission timing signal TX.

Then, CPU 360 turns on the power save signal (step 504), and determines whether or not the data rate is limited in the previous frame (step 505). In the mobile phone terminal of this embodiment,
Since the processing shown in FIG. 5 is performed for each frame, even if the data rate of the audio encoder 204 is limited in step 503, the data rate is actually limited only in the next frame. become.

Therefore, in this embodiment, when it is determined in the determination processing of step 505 that the data rate is not limited to the half rate or less in the previous frame, the vibrator request signal VR is turned off (step 505). 506) The process shown in FIG. 5 ends.

If it is determined in step 505 that the data rate has already been limited to a half rate or less in the previous frame, the vibrator request signal VR is turned on (step 509), and FIG.
Is completed. As a result, as described above,
The OR gate circuit 305 and the AND gate circuit 306 form a vibrator control signal that is turned on only when the transmission timing signal TX for controlling the data rate is off. When the transmission timing signal TX is on, the vibrator does not turn on. , The maximum value of the current can be suppressed.

In the determination process of step 502, the rechargeable battery 3
If it is determined that the battery voltage at 71 is equal to or higher than the predetermined voltage V2 + α, the battery voltage is sufficiently high.
There is no problem if 74 is driven. Therefore, the data rate of the audio encoder 204 is not limited (step 50).
7) Turn off the power save signal PSV (step 508). Then, the vibrator request signal VR is turned on (step 509), and the processing shown in FIG. 5 ends.

If it is determined in step 501 that there is no incoming notification request, the data rate of the audio encoder 204 is not limited (step 51).
0), the power save signal PSV is turned off (step 511). Then, the vibrator request signal VR is turned off (step 512), and the processing shown in FIG. 5 ends.

Thus, as described above with reference to FIG. 4, when the battery voltage of rechargeable battery 371 is lower than the predetermined voltage and transmission system 200 and vibrator 374 are driven simultaneously, the power supply of the portable telephone terminal is reduced. If it falls, the transmission timing signal TX for controlling the operation and non-operation of the transmission system 200 is off, and the vibrator 374 can be driven only when the transmission system 200 is not operating.

Therefore, even when the portable telephone terminal of this embodiment receives a call and activates vibrator 374 and transmits a control signal indicating that a call is being made to the base station, the data rate is restricted and the Since the vibrator is driven only in the transmission section, the transmission system 200
And the vibrator 374 is not driven at the same time,
When the battery voltage drops below the necessary minimum level, it is possible to prevent the power supply of the mobile phone terminal itself from dropping, thereby preventing the mobile phone terminal from becoming inoperable.

In the case of the portable telephone terminal of this embodiment, the vibrator 374 is used as a device for notifying an incoming call. Similarly, it is possible to emit light only when the transmission timing signal is off, that is, only in the non-transmission section. The other devices for notifying the incoming call can be similarly controlled.

Although the processing shown in FIG. 5 is executed in units of frames as described above, it may be executed in longer time intervals such as every two frames or every three frames. .

Further, in the above-described embodiment, the case where the portable communication terminal of the present invention is applied to a portable telephone terminal has been described, but the present invention is not limited to this. For example, the present invention can be applied to various portable communication terminals that receive driving power from a battery, a rechargeable battery, or the like, such as a pager or a portable information processing terminal having a communication function.

[0054]

As described above, according to the portable communication terminal of the first aspect of the present invention, by suppressing the maximum current, the battery voltage of the battery supplying the drive current becomes equal to or lower than the operation lower limit voltage. Can hold things down. As a result, it is possible to prevent inconvenience such as a decrease in the battery voltage of the battery due to an increase in the maximum current and a drop in the power supply of the portable communication terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a mobile phone terminal to which a mobile communication terminal according to the present invention is applied.

FIG. 2 is a diagram for describing a change in a transmission rate performed in the mobile phone terminal shown in FIG.

FIG. 3 is a diagram for explaining a relationship among a vibrator request signal, a transmission timing signal, a power save signal, and a vibrator control signal in the mobile phone terminal shown in FIG.

FIG. 4 is a diagram for describing a current state when the transmitting system and the vibrator are alternately operated in the mobile phone terminal shown in FIG. 1;

FIG. 5 shows a transmission timing signal TX and a power save signal P
It is a flowchart for demonstrating the control process of ON / OFF of SV and the vibrator request signal VR.

FIG. 6 is a diagram illustrating an example of a channel configuration between a base station and a mobile phone terminal.

FIG. 7 is a diagram for explaining voltage characteristics of a rechargeable battery used for a mobile phone terminal or the like.

FIG. 8 is a diagram for explaining a current state when a transmission system and a vibrator in a conventional mobile phone terminal are simultaneously driven.

[Explanation of symbols]

100: receiving system, 200: transmitting system, 301: antenna,
302: antenna duplexer, 303: synthesizer, 30
4 time base circuit, 305 OR gate circuit, 306 AND gate circuit, 360 C
PU, 361 ... EEPROM, 362 ... RAM, 363
... ROM, 364 ... key operation unit, 365 ... LCD, 37
1: rechargeable battery, 372: power supply circuit, 373: A /
D converter (for battery voltage detection), 374 ... vibrator

Claims (1)

[Claims] 1. A transmission rate changing means for variably changing a transmission data rate, a battery voltage detecting means for detecting a battery voltage of a battery for supplying a driving power, and a battery voltage detected by the battery voltage detecting means being determined in advance. Determining means for determining whether the voltage is lower than a predetermined voltage; and determining that the voltage of the battery supplying the driving power is lower than a predetermined voltage by the determining means. A transmission data rate control means for controlling the transmission rate changing means to lower the transmission data rate so as to provide a non-transmission section; and a user informing that there is an incoming call in the non-transmission section. A portable communication terminal, comprising: an incoming call notification control means for operating an incoming call notification means for notifying the user of the portable communication terminal.