JPH02206231A - Signal transmission system in mobile communication - Google Patents

Abstract

PURPOSE:To reduce power consumption of a receiver by allowing a transmission side to inform whether or not effective information is included in a signal in a period at every prescribed period to a reception side by means of a code or the like and allowing the reception side to identify the code. CONSTITUTION:A control circuit 6 generates a level display code in response to the state of the presence of an input level notified through a control line 4, inputs the code to an adder circuit 7 and sent to an opposite station via a modulator 9, a transmitter 9 and an antenna 10. Then a demodulation signal demodulated at a demodulator 13 via an antenna 11 and a reception circuit 12 in the receiver side is inputted to a control circuit 14 via an internal connection 15. The control circuit 14 decodes the signal. Then a level display code in the first part of a frame is checked and when it is discriminated that no information is included in the frame, the control circuit 14 sends a control signal to a power control line 16. As to the remaining time in the frame, the power supply for the reception circuit 12 and the demodulator 13 is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power control method for a mobile device in mobile communication, and particularly to a signal transmission method that can reduce power consumption of a receiving section of a mobile device.

[Conventional technology]

Conventional technologies for reducing power consumption in mobile devices include methods that reduce the operating current of the circuit itself, intermittent reception during standby, and VOX that turns on the transmitter only when there is an audio signal to be transmitted. etc. were considered.

Intermittent reception during standby means that mobile devices are divided into groups and the timing for calling each group of mobile devices is determined in advance.
A mobile device turns on its receiving section only when the group to which it belongs is called, and turns it off at other times.

Further, vOX is a system that turns on the transmitting section only when there is a transmitted voice from the mobile figA during a call, and turns off the transmitting section when there is no transmitted voice.

Like a car phone, which has a low power consumption per mobile phone and a transmitting power of about 5W, most of the time the mobile phone is turned on is in standby mode, and only a small portion of the time is talk time. If there is, and the power consumption of the transmitting unit is considerably higher than that of the receiving unit during a call, the above two techniques are extremely effective.

[Problem to be solved by the invention]

As mentioned above, standby is a method that sometimes performs intermittent reception, and VOX is highly effective for communication methods with usage conditions such as car phones, but like cordless phones,
The traffic per mobile phone is as high as that of a landline phone,
Therefore, it is not sufficient for devices that are in use for a long time and whose transmission power is weak (for example, 10 mW) or small.

On the other hand, for these devices, it is desirable to reduce the power consumption of the receiving section during communication as much as possible, especially since the power supply capacity of the mobile device is often small. However, this cannot be achieved with conventional technology. It didn't happen.

In view of these conventional problems, it is an object of the present invention to provide a signal transmission method that can reduce the power consumption of the receiver ε unit during communication.

[Means for Solving the Problems] According to the present invention, the above-mentioned object is achieved by the means described in the scope of Patent No. 1II11.

That is, the present invention provides a means for transmitting an I/O signal on the transmitting side by adding an I[1] that indicates whether or not the transmitted signal within the period includes valid information every fixed period of the I/O signal. 1. means for receiving the signal on the receiving side and identifying whether or not the display indicates that the transmitted signal within the period includes a valid 14tIN; When it is determined by the means that no valid information is included, the means for shutting off the power supply to a part of the F!fi for a short period of time until the end of the period is It is a signal transmission method in communication.

[For production]

In the present invention, a transmission signal is divided into, for example, seven frames, and each frame has a specific shape! ! (a pattern determined by whether or not valid information is rare) is added to the beginning of each of the seven frames. The most important feature is that the receiving unit is turned off for the remainder of the frame if the frame does not contain valid information.

In the conventional technology, it was only possible to reduce the power consumption of the standby unit during reception and the power consumption of the transmitter unit during communication, but with the present invention, the power consumption of the receiver unit during communication can also be reduced. The points you get are different.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention, in which (a) shows a transmitter and (b) shows a receiver.

In the figure, 1 is a signal input terminal, 2 is an A/D conversion circuit, 3 is a memory circuit, 4 is a control line, 5 is a timing control line, 6 is a control circuit, 7 is an adder circuit, 8 is a modulator, 9 is a transmitting circuit, 10.11 is an antenna, 12 is a receiving circuit, 13 is a demodulator, 14 is a control circuit, 15 is an internal connection, 16 is a power supply control line, 17 is a D/A conversion circuit, and 18 is an output terminal. ing.

In (,), the receiving unit paired with the transmitting unit is shown, and in (b),
.

Here, the description of the transmitting section paired with the receiving section is omitted.

A communication signal such as an audio signal is inputted from a signal input terminal 1 to an A/D conversion circuit 2 and converted into a digital signal. A/
In the D conversion circuit 2, timing control #I from the control circuit 6
The control circuit 6 is notified via the control line 4 whether or not there is an input signal level during the time specified by 5. The digitally converted signal is temporarily stored in the memory circuit 3 as one frame.

The control circuit 6 creates a code to display the input level (hereinafter referred to as a level display code) according to the presence or absence of the input level notified by the control line 4, inputs it to the adder circuit 7, and then sends it to the modulator. 9. Transmission 1f19, transmits to the other party's station via the antenna 10. Following this level indicator,
The communication signal for one frame stored in the memory 3 is read out under timing control using the timing control line from the control circuit 6, and sent to the other party via the adding circuit 7, modulator 8, transmitting circuit 9, 7, and antenna 10. sent to the station.

On the other hand, on the receiving side, a demodulated signal demodulated by a demodulator 13 via an antenna 11 and a receiving circuit 12 is input to a control circuit 14 via an internal connection 15.

The control circuit 14 decodes this, but first checks the level display code in the first part of the 7 frames, and when it is found that no information is included in these 7 frames, the control circuit 14
sends a control signal to the power supply control m16, and for the remaining time of these 7 frames, the receiving circuit 12 and the demodulator 13
control to turn off the power. At the same time, the control circuit 14 sends a signal (for example, 0, 0° 0, . . . ) indicating that no information is included to the D/A conversion circuit 17.

When the level display code indicates that information is included in this frame, the control circuit 14 sends the information signal portion obtained by removing the level display code from the demodulated signal to the D/A conversion circuit 17, Convert to analog signal and output terminal 18
Output to.

FIG. 2 shows an example of the structure of symbols such as level display codes and information signals, and the relationship between on/off control of the receiving section power supply.
−”'”' is level display code, b++ btu bx
rb41... represents 7 frames of the information signal.

The lower row shows the receiving section power on/off operation when au, a< indicates that there is information and a 2 e a 3 indicates that there is no information. a4 tIIJ3 FIG. 3 is a block diagram showing the configuration of a second embodiment of the present invention, in which (a) shows the configuration of the transmitter and (b) the configuration of the receiver.

In the figure, 19 is a level detection circuit, 20 is an analog modulator, 21 is an analog demodulator, 22 is a low-pass filter, 2
3 represents a high-pass filter, 24 a control circuit, and 27 an analog delay circuit. Further, parts equivalent to those in FIG. 1 are indicated by the same numerals as in FIG. 1.

In the figure, an information signal from a signal input terminal 1 is branched to an adder circuit 7 and a level detection circuit 19.
At step 9, the control circuit 6 detects the presence or absence of a level at the time designated by the timing control m5, and notifies the control circuit 6 of the result via the control line 4. The control circuit 6
Then, depending on the presence or absence of a level, this is displayed using a tone signal outside the audio lower band.For example, when a tone signal is sent, no level is displayed, and when it is not sent, a level is displayed.

The tone signal is added by the adding circuit 7 to the communication signal delayed by the analog delay circuit 27 by a time corresponding to the level detection time, and is transmitted to the other station by the analog modulator 20, the transmitting circuit 9, and the antenna 10.

On the receiving side, the A/D is passed through the antenna 11 and the receiving circuit 12.
The signal demodulated by the conversion circuit 21 is branched, and one side is sent to the output terminal 18 via a high-pass filter 23 that passes the spectrum above the communication signal band, and the other side passes the spectrum below the communication signal band. The signal is transmitted to the control circuit 24 via the low-pass filter 22.

The control circuit 24 detects a tone signal indicating the presence or absence of a level outside the lower audio band, and if the absence of level is displayed, a control signal is sent via the power supply control line 16 at a timing corresponding to the time when the level is detected on the transmitting side. receiving circuit 12 only during
Then, the analog demodulator 21 is powered off.

FIG. 4 is a diagram illustrating the relationship between a tone signal indicating the presence or absence of a level and a spectrum of a communication signal.

In the figure, 25 represents the frequency spectrum of a tone signal indicating the presence or absence of a level, and 26 represents the frequency spectrum of a communication signal.

In the above explanation, the case where the receiver's power is turned off is explained as a case where there is no information signal level, but for example, in the case of a dinotal signal, even if there is an information signal level, a continuous 'O'' ( There are cases where there is no significant information, such as oooooo...'').

To generalize, there is no valid information in the state of the input signal! ! ! (pattern).In the case of an audio signal, it is effective to create a silent state with no audio signal.

〔Effect of the invention〕

As explained above, according to the present invention, the transmitting side notifies the receiving side at each fixed period (for example, frame) whether or not the signal within the period contains valid information, using a code or the like. By identifying the code, if the frame does not contain valid information, the receiver turns off the power to the main part of the receiver until reception of the frame is completed. Since detailed power-on/off control can be performed, there is an advantage that operations can be performed to reduce the power consumption of the receiver even during communication.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention, FIG. 2 is a diagram illustrating the relationship between an example of the code structure and the on/off operation of the receiver power supply, and FIG. 3 is a block diagram showing the configuration of the first embodiment of the present invention. FIG. 4 is a block diagram showing the configuration of the second embodiment, and is a diagram illustrating the spectrum of a transmission signal. 1...Signal input terminal, 2...
・・・・A/D conversion circuit, 3 ・・・・・・
Memory circuit, 4...Control line, 5
・・・・・・ Timing control line, 6 ・
...control circuit, 7...addition circuit,
8...modulator, 9...transmission circuit, io, i17 antenna, 1
2...Reception circuit, 13...Demodulator, 14...Control circuit, 15...
...internal connection, control line, 17 ...18 ...output terminal, detection circuit, 20 ...21 ...
...analog demodulator, ...low-pass filter, 23 ...24
...Control circuit, 2 Frequency spectrum of display signal, 26 ...Frequency spectrum of communication signal, 27
...Analog delay circuit 16 ...Power side D/A conversion circuit, 19 ... Level analog modulator, 22 ... High frequency waveform generator, 5 ...・・・ Level

Claims (1)

[Claims] The transmitting side is provided with means for adding and transmitting a signal indicating whether or not the transmitted signal within the period includes valid information at each fixed period of the transmitted signal, and the receiving side receives the signal. means for identifying whether or not the display indicates that the transmitted signal within the period contains valid information; 1. A signal transmission system for mobile communications, comprising means for stopping power supply to at least a part of a receiver until the end of the period.