JPH1084312A - Mobile radio telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radio telephone set in which the service life of a battery is extended by urging the positive method leading to reduction of power consumption such as movement to a location in an excellent radio wave propagation state to the user. SOLUTION: When a level of a reception wave received by a reception level detection circuit 23 is higher than a comparison reference value, a control section 5 sends a transmission output reduction signal to a variable amplifier of a transmission section 13 and a current consumption reduction signal to a power amplifier of the transmission section 13. Then the transmission output is controlled, the transmission output is reduced and the reduction in the current is executed. When the transmission output is controlled, it is displayed on a display section 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio telephone which is connected to a base station via a radio line and performs a call via the base station. The present invention relates to a mobile radio telephone in which the transmission output reduction control function is effectively used by notifying the mobile radio telephone of an operation state of the transmission output reduction control function in the mobile radio telephone having a transmission power reduction control function for reducing the transmission power.

[0002]

2. Description of the Related Art Heretofore, as this type of mobile radio telephone, a mobile radio telephone having a configuration shown in a block diagram of FIG. 7 is known.

That is, in FIG. 7, a radio wave transmitted from a base station (not shown) is received by an antenna 107,
The radio signal received by the antenna 107 is input to the radio reception circuit 104 via the antenna duplexer 106, is converted into a baseband signal here, is output to the speaker 110 via the baseband signal processing circuit 108, and is output as voice. Pronounced.

[0004] A voice signal input from a microphone 109 is input to a radio transmission circuit 101 via a baseband signal processing circuit 108, where it is converted into a radio signal, and transmitted to the antenna 10 via an antenna duplexer 106.
7 to a base station (not shown).

[0005] The reception electric field strength of the radio signal input to the radio reception circuit 104 is detected by a reception level detection circuit 105, and the detection output of the reception level detection circuit 105 is input to a control unit 113.

A control unit 113 controls a baseband signal processing circuit 108, sounds a sounder 111 in response to a signal from the baseband signal processing circuit 108, and displays an operation state of the mobile radio telephone on an LCD.
(Liquid crystal) Display control to be displayed on the display device 112 is performed.

The control section 113 controls the transmission modulation circuit 103 and the transmission output amplifier 101 constituting the radio transmission circuit 101 based on the detection output of the reception level detection circuit 105.

That is, it is generally considered that the transmission output from the mobile radio telephone reaches the corresponding base station at a high level where the reception electric field strength is high. In this case, the reception section of the base station causes reception deterioration, so , Control unit 113
When the detection output of the reception level detection circuit 105 is larger than a predetermined value, the transmission modulation circuit 10
3 and the transmission output amplifier 101,
Transmission output reduction control is performed to reduce the transmission output from the mobile radio telephone from the maximum transmission output by a predetermined level.

Since the transmission modulation circuit 103 of the radio transmission circuit 101 employs a digital modulation method, the transmission output amplifier 101 of the radio transmission circuit 101 is controlled so as to always maintain linear characteristics. There is a need. When the transmission output reduction control is being performed, even if a current smaller than the current consumption necessary for the maximum transmission output is supplied to the transmission output amplifier 101, the transmission output amplifier 1
01 can be maintained.

More specifically, the above-described transmission output reduction control is performed by changing the bias of the transmission output amplifier 101 by the control unit 113.

In this case, the transmission output amplifier 101 can operate by transmitting a current smaller than the required current at the maximum transmission output to the transmission output amplifier 101. Therefore, this transmission output reduction control function is used. As a result, the current consumption of the mobile radio telephone can be reduced, and the life of a battery or the like as a power source of the mobile radio telephone can be extended.

However, in the conventional mobile radio telephone, when the detection output of the reception level detection circuit 105 is larger than a predetermined value, the control section 113 performs transmission output reduction control for reducing the transmission output from the maximum transmission output by a predetermined level. However, since there is no means for the user of the mobile radio telephone to know whether or not the transmission power reduction control is being performed, the user actively moves the mobile radio telephone to reduce the transmission power. It was not possible to extend the life of a battery or the like by making the control function work as much as possible.

[0013]

As described above, in the conventional mobile radio telephone, there is no means for the user to know whether or not the transmission output reduction control is performed by the mobile radio telephone. Even if the user moves this mobile radio telephone and tries to extend the life of a battery or the like by using the transmission output reduction control function as much as possible,
There was a problem that this was not possible.

Accordingly, the present invention enables the user of this mobile radio telephone to easily know whether or not the mobile radio telephone is performing transmission output reduction control, and makes this transmission output reduction control function effective. It is an object of the present invention to provide a mobile radiotelephone capable of extending the life of a battery or the like by utilizing the same.

[0015]

To achieve the above object, the present invention relates to a mobile radio telephone connected to a base station via a radio line, comprising: a radio receiving means for receiving a radio signal from the base station; Receiving electric field intensity detecting means for detecting a receiving electric field intensity of a radio signal from the base station, radio transmitting means for transmitting a radio signal to the base station, and the base station detected by the receiving electric field intensity detecting means It operates when the reception electric field strength of the radio signal from is stronger than a predetermined value,
A transmission output reduction control unit configured to reduce a transmission output of a radio signal transmitted from the radio transmission unit to the base station; and a notification unit configured to report an operation state of the transmission output reduction control unit. And

Here, the notifying unit may be configured to notify the operating state of the transmission output reduction control unit by displaying predetermined characters or marks on a display unit provided in the mobile radio telephone. it can.

[0017] The notifying means may be configured to notify the operating state of the transmission output reduction control means by turning on and off a light emitting element provided in the mobile radiotelephone.

Here, the light emitting element may be arranged near a transmitter of the mobile radiotelephone.

Further, the notifying means may be configured to notify the operating state of the transmission output reduction control means by mixing a predetermined sound into the reception sound of the mobile radio telephone.

[0020] The notifying means may be configured to notify the operating state of the transmission output reduction control means by mixing a sound of a predetermined frequency into the ring tone of the mobile radiotelephone.

According to the present invention, the user of the mobile radiotelephone determines whether or not the mobile radiotelephone is performing the transmission output reduction control by a visual angle method, an auditory method, or a combination thereof. Since the user can be notified, the user of this mobile radio telephone effectively moves the transmission output reduction control function by moving to a place where radio wave propagation is good, thereby reducing the power consumption of this mobile radio telephone. It is possible to extend the life of a battery or the like which is a power source of the mobile radio telephone.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the mobile radio telephone according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a personal station (PS) of a digital cordless telephone to which the present invention is applied.

In FIG. 1, reference numeral 1 denotes a receiving side which receives a radio wave from a base station, converts it into a digital baseband signal by performing intermediate frequency processing and receives it, and transmits a digital baseband signal to the transmitting side by performing intermediate frequency processing. The radio section 2 converts the frequency to power, amplifies the power, and transmits it as a radio wave to the base station. On the receiving side, it performs frame synchronization and bit synchronization from the digital baseband signal, sends the synchronization signal to the control section 5, and shifts the received signal by π / 4 A demodulation unit for performing QPSK demodulation is provided.
The modem unit having a modulator for K modulation, 3 is π on the receiving side.
The own slot signal is extracted from the digital signal demodulated by / 4 shift QPSK, and the transmitting side places a voice-encoded signal in its own slot of the TDMA signal in TDMA (Time).
DivisionMultiple Access), 4 is AD on the receiving side
A communication unit that performs PCM demodulation, demodulates a voice signal from a digital signal by performing PCM demodulation, and sends the demodulated signal to a speaker 43 serving as a receiver; 5 is a control unit for controlling the entire apparatus, 6 is a display unit for displaying a display necessary for communication, a dial number, etc., 7 is an operation unit for operating a device such as a key dial operation, and 8 is a ringing tone. A sounder 9 is a memory unit for storing information necessary for control, a program, a speed dial, and the like.

The radio unit 1 is commonly used for transmission and reception, and inputs and receives a radio reception signal from the base station received by the antenna 11 through the transmission / reception switch 15 for tuning and tuning. A receiving unit 12 that performs an intermediate frequency process on the radio reception signal with a carrier signal or the like output from the synthesizer 14 and converts the signal into a digital baseband signal;
The π / 4 shift QPSK modulation signal from the modulation unit 22 is subjected to intermediate frequency processing, finally modulated with a carrier signal output from the synthesizer 14, power-amplified to a level required for transmission, and transmitted via the transmission / reception switch 15. A synthesizer 14 for combining and outputting a carrier signal from an oscillation signal from a crystal oscillator 16 and a transmission / reception switch 15 for switching the antenna 11 between a reception unit 12 and a transmission unit 13 according to a transmission / reception control signal from the control unit 5 Is done.

The modem unit 2 demodulates and detects a π / 4-shifted QPSK modulated signal of the received digital baseband signal output from the receiving unit 12 and converts it into a serial data signal.
And the serial data signal from the TDMA transmission unit 32
It is composed of a modulating unit 22 for modulating a / 4 shift QPSK modulated signal. Further, the modem unit 2 is provided with a reception level detection circuit 23 for detecting a reception signal level.

Further, the TDMA unit 3 is provided with a TDMA receiving unit 31 for extracting a slot signal from the serial data signal output from the demodulating unit 21 and performing time division multiplexing decoding, and an ADPCM.
It comprises a TDMA transmission unit 32 that encodes an audio signal from the codec 41 into a transmission slot.

The speech unit 4 is an adaptive differential pulse code modulation code composite device that performs speech processing with simple processing and small delay while maintaining speech quality in accordance with the linear prediction of the speech signal using the redundancy of the speech signal. An ADPCM (Adaptive
Pulse Code Modulation (codec) 41 and a PCM (Pu) that digitizes analog voice into PCM code and converts voice digitized into PCM code into an analog signal.
lse Code Modulation) codec 42,
It is connected to a speaker 43 as a receiver and a microphone 44 as a transmitter.

On the other hand, the control unit 5 is composed of a microprocessor or the like, and controls the entire apparatus. A display unit 6 for displaying a display necessary for communication and a dial number, an operation unit 7 for operating a device such as a key dial operation, a sounder 8 for generating a ringing tone, information necessary for control, a program and a speed dial, etc. Is connected.

A reception level detection circuit 23 detects a level of a reception wave received by the reception unit 12 via the antenna 11 and the antenna sharing circuit 15. When the level of the received wave received by the reception level detection circuit 23 is higher than the comparison reference value, the reception level detection circuit 23 sends a reception level signal to the control unit 5. When receiving the reception level signal, the control unit 5 transmits the transmission output reduction signal and the current consumption reduction signal to the transmission unit 1.
Send to 3.

The transmitting section 13 includes a variable amplifier 131 and a power amplifier 132.

In the variable amplifier 131, the transmission output of the output signal is controlled by the transmission output reduction signal, and the transmission output is reduced uniformly by a predetermined amount (Ndb).
Further, the power consumption reduction signal is sent to the power amplifier 132 at the same time, and the power amplifier 132 does not need to supply a current required for the maximum output. Therefore, a method such as changing the bias of the last-stage transistor of the power amplifier 132 is used. Perform current reduction.

In the present invention, when the slave unit of the digital cordless telephone performs such transmission output control, the control unit 5 controls any one of the display unit 6, the sounder 8, and the speaker 43, or another output device. As the notification means, the fact that the transmission output control is being performed using the notification means is displayed to notify the user.

FIG. 2 is an external view of a slave unit of a digital cordless telephone to which the present invention is applied. FIG. 3 shows the display contents of the LCD display device of the display unit 6 of the digital cordless telephone handset.

The appearance of the digital cordless telephone includes a display unit 6 comprising an LCD display device, an operation unit 7 comprising various push buttons for operation, a speaker 43 serving as a receiver, a microphone 44 serving as a transmitter, a sounder 8, and an antenna. 11 and the like are installed.

In FIG. 2, reference numeral 71 denotes a menu button which is pressed when a menu function is used, and 72 denotes a function / function.
The lowercase button is used to select the function you want to use in combination with the dial button, etc. The lowercase button is used to convert uppercase characters to lowercase when entering characters. 73 is the Kana / English button for Kana input mode. Press the button to switch between and the alphabet input mode and the number input mode. 74 is a symbol button to input the voice, semi-voiced sound, long sound, etc. in the kana character input mode, and to input the period, apostrophe, hyphen, etc. in the alphabet input mode. The button to be pressed when calling, the button 75 to press the redial button to call the telephone number once called, the button 76 to call the contents already registered in the memory dial by the call button, the button 77 to memory Button to press to register a phone number or the like in the memory dial with the button, 78 The clear button is used to delete characters etc., the start button 79 is used to make or receive a call, etc. The hold button 80 is used to hold a call or transfer a call using the hold button A push button 81 is a button that is pressed when the user ends the call with the end button, or cancels registration or setting.

The 82 buttons "0" to "9" and "*" and "#" are used when dialing with a dial button, when inputting numbers and characters, when switching menu screens, and when pressing a function / lower case button. This button is used when selecting a function together with 72.

Next, the display on the LCD of the display unit 6 in FIG. 3 indicates that the character input mode is the kana input mode, and that the character input mode is the alphabet input mode. Display, indicates that the call is in progress, indicates that the phone is in standby, indicates that the radio wave is being received, indicates that the secret mode is set, and indicates that the display is scrolling. A display indicating that there is, a display indicating that the use environment setting is the inter-child communication mode, a display indicating that the use environment setting is the public call mode, and 10 indicates that the user is in a place where radio waves do not reach. It is a display shown. The rest of the display is an alphanumeric display showing messages, function names, phone numbers, and the like.

As a specific example of the notification means, this LCD
A display on a display device can be used. For example, when the slave unit of the digital cordless telephone is performing transmission output control, for example, one, two, or three of the shortest indications indicating the strength of the received radio wave are blinked ( When the handset of the digital cordless telephone performs transmission output control, it corresponds to the case where the strength of the received radio wave is strong, so three vertical bars in this display are output.) Alternatively, another display is performed instead of the three vertical bars. Alternatively, a completely different mark or character is displayed on the LCD display device. And the like.

As another specific example of the notification means, for example, a light emitting element 10 such as an LED can be used.
FIG. 4 is a block diagram of a digital cordless telephone handset when such a light emitting element is used. By providing the light emitting element 10 as the notification means at the position 50 in FIG. 2, that is, at the side of the transmission microphone 44, the display becomes easier to see during a call.

FIG. 5 shows the configuration of still another embodiment of the mobile radio telephone according to the present invention. In this example, the speaker 43 is used as the notification means, and when the transmission output control is being performed by the slave unit of the digital cordless telephone, the oscillator 19 is operated, and the oscillation sound is superimposed on the reception sound so that the user can use the speaker 13. It is to let you hear. As the oscillating sound, for example, a method of intermittently inserting a sound of a specific frequency at intervals of about several seconds, tens of seconds to several minutes, or the like can be considered.

FIG. 6 shows the configuration of still another embodiment of the mobile radiotelephone of the present invention, in which a sounder 8 is used as a notifying means and transmission output control is performed by a slave unit of the digital cordless telephone. In this case, the sounding device 18 is activated to sound a sound different from a normal ringtone to notify the user.

The notifying means is not limited to the above example, and it goes without saying that any means can be used as long as it can send a signal that can be detected by a vibrator or other user.

In the above description, the notification means is operated when the transmission output control is being performed.
When the transmission output control is not performed, the notification unit may be operated.

Also, the transmission output control has been described as reducing the transmission output by a predetermined amount (Ndb). However, the transmission output may be variably reduced according to the magnitude of the reception level. .

According to the present invention, the user is notified that transmission output control is being performed in the mobile radio telephone by any of the methods described above. This makes it possible for the telephone to actively control the transmission output by, for example, moving the user to a place with good transmission / reception conditions, thereby reducing power consumption and extending battery life.

[0047]

As described above, in the mobile radiotelephone of the present invention, the fact that the transmission output control is being performed is indicated by "LCD".
The user is notified using various methods such as "display on display device", "shown by light emitting element", "superimpose oscillating sound on received sound", and "show by sounder". This allows the user to actively take measures such as moving to a place with good transmission / reception conditions and to have the telephone perform transmission output control,
Battery life can be extended by reducing power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a mobile radio telephone according to the present invention.

FIG. 2 is an external view of the embodiment shown in FIG.

FIG. 3 is a view showing display contents of a display unit of the embodiment shown in FIG. 1;

FIG. 4 is a block diagram showing a configuration of another embodiment of the mobile radio telephone according to the present invention.

FIG. 5 is a block diagram showing a configuration of still another embodiment of the mobile radio telephone according to the present invention.

FIG. 6 is a block diagram showing a configuration of still another embodiment of the mobile radio telephone according to the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional mobile radio telephone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio part 2 Modem part 3 TDMA part 4 Talk part 5 Control part 6 Display part 7 Operation part 8 Sounder 9 Memory part 10 Light emitting element 11 Antenna 12 Receiving part 13 Transmitting part 14 Synthesizer 15 Transmission / reception changeover switch 18 Sound generator 19 Oscillator 21 Demodulation unit 22 Modulation unit 23 Reception level detection circuit 31 TDMA reception unit 32 TDMA transmission unit 41 ADPCM codec 42 PCM codec 43 Speaker 44 Microphone 50 Light emitting element mounting position 71 Menu button 72 Function / lowercase button 73 Kana / English button 74 Symbol button 75 Redial button 76 call button 77 memory button 78 clear button 79 start button 80 hold button 81 end button 82 dial button 101 wireless transmission circuit 102 transmission output amplifier 103 transmission variable Part 104 radio receiving circuit 105 receiving level detector circuit 106 antenna duplexer 107 antenna 108 baseband signal processing circuit 109 microphone 110 speaker 111 sounder 112 LCD display 113 controller 131 variable amplifier 132 power amplifier

Claims (6)

[Claims] 1. A mobile radio telephone connected to a base station via a radio line, comprising: a radio receiving means for receiving a radio signal from the base station; and detecting a reception electric field strength of the radio signal from the base station. Reception electric field strength detection means, a radio transmission means for transmitting a radio signal to the base station, and a case where the reception electric field strength of the radio signal from the base station detected by the reception electric field strength detection means is higher than a predetermined value A transmission output reduction control unit that operates to reduce the transmission output of a radio signal transmitted from the radio transmission unit to the base station; and a notification unit that reports an operation state of the transmission output reduction control unit. A mobile radio telephone. 2. The system according to claim 1, wherein the notifying unit notifies the operating state of the transmission output reduction control unit by displaying predetermined characters or marks on a display unit provided in the mobile radio telephone. 1
The mobile radiotelephone as described. 3. The mobile radio telephone according to claim 1, wherein the notifying unit notifies the operating state of the transmission output reduction control unit by turning on and off a light emitting element provided in the mobile radio telephone. . 4. The mobile radio telephone according to claim 3, wherein the light emitting element is disposed near a transmitter of the mobile radio telephone. 5. The mobile radio according to claim 1, wherein the notifying unit notifies the operating state of the transmission output reduction control unit by mixing a predetermined sound into the reception sound of the mobile radio telephone. Phone. 6. The system according to claim 1, wherein the notifying unit notifies the operating state of the transmission output reduction control unit by mixing a sound of a predetermined frequency into a ring tone of the mobile radio telephone. Mobile radio telephone.