JPH048021A - Intermittent reception system for mobile communication - Google Patents

Abstract

PURPOSE:To easily attain changeover of an auxiliary channel of a mobile equipment by supplying power to each circuit in a receiver even at a period other than that assigned to the TDM channel in use when information of a surrounding channel is required for changeover of the auxiliary channel of the mobile equipment. CONSTITUTION:A power detection circuit 10 detects reception power in the TDM channel in use and gives the power to a control circuit 9. When the reception power of the control circuit 9 is smaller than a predetermined power, the operation of the auxiliary channel of the mobile set is commanded to a power supply changeover circuit 8 to start and power is supplied to each circuit even for a period other than that assigned to the TDM channel in use and the control circuit 9 monitors the reception power of the surrounding channel through the power detection circuit 10. The information of the surrounding channel obtained in this way is sent to a base station through a transmitter and used for judgement to apply channel changeover command at a base station.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is used to save power consumption of receivers in mobile communications typified by car telephones, particularly in time division multiplexing (TDMA) mobile communications. The present invention relates to an intermittent reception system for mobile communications.

(Prior art) Regarding the conventional intermittent reception method for this type of mobile communication,
Edited by Masaaki Shinshi, Mobile Communications, Maruzen, September 30, 1989, 2
Pages 39-241”.

FIG. 2 is a diagram for explaining a conventional intermittent reception method for mobile communication. In Fig. 2, 1 is an antenna, 2 is a charged pass filter (BPF), 3 is a mixer, 4 is an amplifier,
5 represents a demodulation circuit, 6 represents an output terminal, 7 represents an oscillation circuit, 8 represents a power supply circuit, and 11 represents a control circuit. In this specification,
Signal lines are shown as solid lines, and power lines are shown as dotted lines.

In FIG. 2, the signal received by antenna 1 is BP
Noise outside the necessary band is removed at F2, and the frequency is converted to an intermediate frequency band by multiplying and combining the sine wave signals from the oscillation circuit 7 at the mixer 3, and then the amplifier 4
is amplified. As the amplifier 4, a non-linear amplifier such as a beam amplifier can be used for a signal whose amplitude is originally constant such as FM modulation, and a linear AGC amplifier can be used for a linearly modulated signal such as QPSK. There is a need. The signal amplified by the amplifier 4 is demodulated by the demodulation circuit 5 and output from the output terminal 6.

The power supply circuit 8 is a circuit that supplies power to circuits within these receivers. In mobile communication, especially in mobile devices, the power supply circuit 8 is usually a circuit that mainly uses a battery, so it is important to save power in order to extend the life of the battery. on the other hand,
In TDMA mobile communication, there is no need to receive signals other than your own TDM channel. Therefore, an intermittent reception method is often adopted in which power is not supplied to circuits within the receiver during periods other than those allocated to its own TDM channel. The control circuit 11 detects reception timing and controls the supply of power from the power supply circuit 8 in order to perform intermittent reception. By performing intermittent reception, power consumption can be reduced to about 1/(number of TDM channels multiplexed).

In normal TDMA mobile communications, TDMA signals are further divided into channels in the frequency domain.

Therefore, in the mixer 3, it is necessary to perform frequency conversion using a sine wave signal of a frequency suitable for the received signal. This can be realized by controlling the frequency of the oscillation circuit 7 with the control circuit 11.

(Issue 1!I to be solved by the invention) However, in the conventional intermittent reception system for mobile communication shown in FIG. There was a point. Here, mobile device auxiliary channel switching means that the mobile device switches its own TD that it does not need to receive.
It monitors surrounding channels using periods other than the M channel, and sends this information to the base station to help the base station decide on channel switching. In the conventional intermittent reception system for mobile communication shown in FIG. 2, the supply of power to each circuit in the receiver is stopped during the period in which surrounding channels are monitored, making it impossible to monitor them.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an intermittent reception system for mobile communications that allows easy mobile auxiliary channel switching.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention divides the period during which reception is performed into a first period including at least the period allocated to the own TDM channel and An intermittent mobile communication system in which power is supplied to each circuit in the receiver in the first period, and power supply to each circuit in the receiver is stopped in the second period. In the reception method, the intermittent reception method for mobile communication detects the received power, and when the received power is smaller than a predetermined value, power is supplied to each circuit in the receiver even during the second period. It is composed of

In other implementations, error rates are detected to control power supply. In still other embodiments, control is based on control information from a transmitter.

(Function) According to the present invention, since the intermittent reception system for mobile communication is configured as described above, when information on surrounding channels is needed for switching the mobile terminal auxiliary channel, the mobile terminal can use its own T.
Since power is supplied to each circuit in the receiver even during periods other than those assigned to the DM channel, there is no problem in mobile device auxiliary channel switching. therefore,
The above problems can be solved.

(Embodiment) FIG. 1 is a diagram for explaining a first embodiment of the intermittent reception system for mobile communication of the present invention. In FIG. 1, 9 is a control circuit, and 10 is a power detection circuit. Elements that are the same as in FIG. 2 are given the same reference numerals.

In FIG. 1, the signal received by antenna 1 is BP
Noise outside the necessary band is removed at F2, and the frequency is converted to an intermediate frequency band by multiplying and combining the sine wave signals from the oscillation circuit 7 at the mixer 3, and then the amplifier 4
is amplified. As the amplifier 4, a non-linear amplifier such as a beam amplifier can be used for a signal whose amplitude is originally constant such as FM modulation, and a linear AGC amplifier can be used for a linearly modulated signal such as QPSK. There is a need. The signal amplified by the amplifier 4 is demodulated by the demodulation circuit 5 and output from the output terminal 6.

The power supply circuit 8 is a circuit that supplies power to circuits within these receivers. The control circuit 9 detects the reception timing and controls the supply of power from the power supply circuit 8 in order to perform intermittent reception. By performing intermittent reception, power consumption is reduced by approximately 1
/ (Number of TDM channel multiplexing). In mobile communications, channel switching occurs when it is considered that sufficient communication quality cannot be ensured on the current channel. This can be considered to be when sufficient received power is not secured. The power detection circuit 10 detects the received power in its own TDM channel and provides the value to the control circuit 9. When the received power value becomes smaller than a predetermined value, the control circuit 9 determines that the need for channel switching has increased and starts the mobile device auxiliary channel switching operation. In other words, the power supply circuit 8 to supply power to each circuit even during periods other than those assigned to its own TDM channel, and monitors the received power of the surrounding channels through the power detection circuit 10. This control also applies to surrounding frequency channels.The information on the surrounding channels obtained by this is sent to the base station through the transmitter, and the base station makes decisions to instruct channel switching. Becomes a material.

FIG. 3 is a diagram for explaining a second embodiment of the intermittent reception system for mobile communication of the present invention. In Figure 3, 12
1 is a control circuit, and 13 is an error stack output circuit. Elements that are the same as in FIGS. 1 and 2 are given the same reference numerals.

The difference between FIG. 3 and FIG. 1 is that in FIG. 1, received power was used as the communication quality evaluation amount, but in FIG. 3, this was used as the error rate. The error rate can be measured by periodically transmitting a predetermined symbol sequence from the base station to the mobile device and comparing it with the result after demodulation.

Otherwise, as in the case of FIG. 1, intermittent reception is normally performed, and when the error rate becomes smaller than a predetermined value, the mobile station auxiliary channel switching operation is performed.

FIG. 4 is a diagram for explaining a third embodiment of the intermittent reception system for mobile communication of the present invention. In Figure 4, 14
1 is a control circuit, and 15 is a detection circuit. Elements that are the same as in FIGS. 1, 2, and 3 are given the same reference numerals.

In FIG. 4, control information is sent from a base station to a mobile device at a predetermined position. In mobile communications, this does not pose any particular problem because various control information is sent from the base station to the mobile device. The detection circuit 15 examines this control information and performs an operation for switching the mobile device auxiliary channel in response to this request.

(Effects of the Invention) As explained in detail above, according to the present invention, although intermittent reception is normally performed, when information on surrounding channels is required for mobile device auxiliary channel switching, Since power is provided to each circuit in the receiver even during a period other than that assigned to the channel, there is no problem with mobile device auxiliary channel switching.Therefore, mobile communication allows mobile device auxiliary channel switching to be performed easily. It is possible to provide an intermittent reception method.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the first embodiment of the intermittent reception method for mobile communications of the present invention, FIG. 2 is a diagram for explaining the conventional intermittent reception method for mobile communications, and FIG. 3 is for explaining the present invention. A diagram for explaining a second embodiment of the intermittent reception method for mobile communication of the invention,
FIG. 4 is a diagram for explaining a third embodiment of the intermittent reception system for mobile communication of the present invention. 1...Antenna, 2...Band pass filter, 3...
・Mixer, 4...Amplifier, 5...Demodulation circuit, 6...
・Output terminal, 7...Oscillation circuit, 8...Power supply circuit, 9
, 12.14... Control circuit, 10... Power detection circuit, 13 River error stacking circuit, 15... Detection circuit.

Claims (3)

[Claims] (1) At least the period during which reception is being performed is at least as long as your own TDM
It is divided into a repeating first period including the period allocated to the channel and a second period other than the period, and in the first period, power is supplied to each circuit in the receiver, and in the second period, power is supplied to each circuit in the receiver. In an intermittent reception system for mobile communication that stops power supply to the receiver, when the received power is detected and the received power is smaller than a predetermined value, each receiver in the receiver is An intermittent reception system for mobile communications characterized by supplying power to the circuit. (2) Minimize the period during which reception is being performed using your own TDM
It is divided into a repeating first period including the period allocated to the channel and a second period other than the period, and in the first period, power is supplied to each circuit in the receiver, and in the second period, power is supplied to each circuit in the receiver. In intermittent reception systems for mobile communications that stop the supply of power to the An intermittent reception system for mobile communications, characterized in that when the power is smaller than , power is supplied to each circuit in the receiver even during the second period. (3) Minimize the period during which reception is being performed using your own TDM
It is divided into a repeating first period including the period allocated to the channel and a second period other than the period, and in the first period, power is supplied to each circuit in the receiver, and in the second period, power is supplied to each circuit in the receiver. In an intermittent reception method for mobile communications that stops power supply to the receiver, control information is received from the transmitter, and each circuit in the receiver is controlled according to the content of this control information even during the second period. An intermittent reception system for mobile communications characterized by the supply of electric power.