JP2000252912A - Mobile radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a mobile radio of a time division multiple access system. SOLUTION: When the reception processing of a control channel is terminated, pause information SLP to designate a pause period to the start of the next reception processing or the like is outputted from a central processing control part 14. A count part 17a is set to the value of the given pause period, and a pause signal SW is outputted from a signal output part 17b. A clock signal CLK is given to the count part 17a through a switch part 16, and counting-down is started in the count part 17a. During the pause period, supply of the clock signal CLK is stopped and the central processing control part 14 completely falls into the stop state, and the power consumption due to unnecessary operation is reduced. After the pause period, the pause signal SW is released, and the clock signal CLK is given to the central processing control part 14 through the switch part 16 to restart the next reception processing or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio apparatus such as a portable telephone in a time division multiple access (hereinafter referred to as "TDMA") type radio communication system, and more particularly to a technique for reducing the power consumption thereof.

[0002]

2. Description of the Related Art In a TDMA mobile phone system,
The same radio frequency is temporally divided and its transmission right is assigned to a base station and a plurality of mobile phones. At the base station or mobile phone, the assigned time (this is
It is possible to communicate with each other by transmitting data and digitized voice signals in a time slot during time compression. FIG. 2 shows the TDM
It is a figure which shows the example of a channel arrangement | positioning in the time domain in the mobile telephone system of A system. In this TDMA system, a continuous time is divided into 640 ms, which is called a superframe. One superframe is further divided into 32 time slots every 20 ms, and the first few time slots are allocated as control channels for transmitting broadcast information from the base station to each mobile phone. Also, the remaining time slots
It is used as a control channel for transmitting other information. These control channels are allocated according to the state of each mobile phone. Which control channel is allocated to which mobile phone is specified by control channel broadcast information transmitted from the base station. Therefore, each mobile phone must always receive the control channel for broadcast information and wait for a call from the base station. Further, the mobile phone specified by the broadcast information given through the control channel receives only the information of the specified time slot until a broadcast information reconfirmation request comes from the base station.

Since a portable telephone uses a battery as a power source, reduction of power consumption is an important issue. TDM
Since transmission / reception is performed intermittently in the A-type mobile phone, power consumption is reduced by stopping power supply to the wireless transmission / reception circuit during the idle period during which transmission / reception is not performed. Further, power consumption is reduced by configuring a control circuit such as a central processing control unit for performing overall processing control with a CMOS logic circuit with low power consumption. However, in the CMOS logic circuit, there is a phenomenon that a through current instantaneously flows from the power supply potential to the ground potential every time the signal level changes from “H” to “L” and from “L” to “H”. . Therefore, to reduce power consumption, it is effective to eliminate unnecessary signal changes. For this reason, for example, in a standby state in which no call is being made, only during a period in which the broadcast information is transmitted from the base station by the control channel, the central processing control unit receives a predetermined frequency to receive and process the broadcast information. The clock signal of (for example, 5 MHz) is supplied to perform processing at a predetermined speed, and the frequency of the clock signal to the central processing control unit (for example, 1 MHz) is set during a rest period in which other high-speed processing is not required.
2) A method of reducing supply was adopted. As described above, the power consumption required for the operation of the central processing control unit is reduced by reducing the frequency of the clock signal during the idle period occupying most of the entire time zone, and power saving is realized. Had become.

[0004]

However, the conventional portable telephone has the following problems. That is, even during the suspension period, the central processing control unit performs timing adjustment for receiving the control channel transmitted in the next superframe or receiving information of the designated time slot, and It was necessary to perform processing for returning the clock signal to a predetermined frequency at the timing. Therefore, the central processing control unit cannot be completely stopped, and it is necessary to supply a clock signal of a minimum frequency necessary for the central processing control unit to continue processing without malfunction. For this reason, there is a limit in reducing the frequency of the clock signal, that is, reducing the power consumption of the central processing control unit. The present invention solves the problem of the prior art by completely stopping the supply of the clock signal to the central processing control unit during the idle period during which transmission and reception are not performed in the TDMA wireless communication system. Another object of the present invention is to provide a mobile wireless device such as a mobile phone capable of reducing power consumption.

[0005]

In order to solve the above-mentioned problems, a first invention of the present invention uses a radio communication line which is temporally divided by a frame composed of a plurality of time slots, In a mobile radio apparatus of a TDMA wireless communication system which performs communication using a communication time slot specified by broadcast information transmitted from a base station in a control time slot in the frame, a reception process of the broadcast information is performed. Control means for performing overall processing control including communication processing for the specified communication time slot based on a clock signal of a predetermined frequency, and pause information for specifying a pause time of the control operation are given from the control means. Means for counting a pause time specified by the pause information and outputting a pause signal during the pause time; Clock supply means for supplying the clock signal to the control means when the pause signal is not output from the means, and stopping supply of the clock signal when the pause signal is output from the timing means. ing.

According to a second aspect of the present invention, the clock supply means according to the first aspect includes a clock oscillating unit for continuously oscillating a clock signal of a predetermined frequency, and the clock oscillating unit when the pause signal is not supplied. And a switch unit for supplying the clock signal to the control unit and switching the clock signal to the clock unit when the pause signal is supplied. Further, the counting unit is configured such that an initial value is set by pause information given from the control unit, and a count unit whose count value is sequentially updated by a clock signal supplied from a switch unit of the clock supply unit; The signal output unit outputs the pause signal until the count value reaches a predetermined value.

According to the present invention, since the mobile radio apparatus is configured as described above, the following operation is performed. For example, when the broadcast information from the base station is received and the receiving process for the broadcast information is completed by the control means, the pause information for specifying the pause time of the control operation until the next broadcast information is received from the control means is transmitted. Is output. Pause information is
For example, the initial value is given to a timing unit constituted by a counting unit and a signal output unit, and an initial value based on the pause information is set in the counting unit of the timing unit. As a result, the pause signal is output from the signal output unit, and is supplied to, for example, the switch unit of the clock supply unit including the clock oscillation unit and the switch unit. When the pause signal is supplied to the switch unit, the supply destination of the clock signal oscillated by the clock oscillation unit is switched from the control unit to the clock unit. Thus, the supply of the clock signal to the control means is stopped, and the control means is completely stopped. On the other hand, a counting operation is started in the counting section of the timer means, and the count value is sequentially updated. When the count value of the counting section reaches a predetermined value, the signal output section stops outputting the pause signal. When the output of the pause signal is stopped, the switch of the clock supply unit is switched to the control unit, and the clock signal is supplied to the control unit again.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a portable telephone showing an embodiment of the present invention. This mobile phone is
A mobile wireless device in a TDMA wireless communication system, which has an antenna 1 for transmitting and receiving, for example, 800 MHz band radio waves to and from a base station. The receiving unit 3 and the transmitting unit 4 are connected to the antenna 1 via the sharing device 2. The receiving unit 3 and the transmitting unit 4 are each provided with a local oscillation signal from a frequency synthesizer 5. The receiving unit 3 receives the signal 8 received by the antenna 1 according to the local oscillation signal given from the frequency synthesizer 5.
A signal of a predetermined frequency is extracted from a wireless signal of the 00 MHz band and converted into a baseband signal. The transmitting unit 4 converts a baseband signal into a predetermined frequency in an 800 MHz band in accordance with a local oscillation signal in order to transmit the signal as a radio wave. The output side of the receiving unit 3 and the input side of the transmitting unit 4 are connected to the modem unit 6.

The modulation / demodulation unit 6 demodulates the baseband signal supplied from the reception unit 3 to generate a reception digital signal, modulates the transmission digital signal, and provides the transmission digital signal to the transmission unit 4 as a baseband signal. Modem 6
A TDMA control unit 7 is connected to the digital signal side. The TDMA control unit 7 detects a control time slot including broadcast information transmitted from the base station based on the received digital signal given from the modulation / demodulation unit 6,
It extracts the timing of a superframe of 40 ms and separates and extracts the reception digital signal of the specific control time slot to be received from the time-division multiplexed reception digital signal. Furthermore, TDMA
The control unit 7 has a function of adjusting transmission timing in order to transmit a transmission digital signal in a specific communication time slot. A code decoder 8 is connected to the TDMA controller 7.

The codec 8 has a decoding function of decoding a received digital signal encoded by an encoding method such as ADPCM and time-compressed, restoring the original audio signal, and outputting it to the speaker 9. I have. The code decoding unit 8 has a coding function of coding the audio signal input from the microphone 10 into a digital signal such as ADPCM, time-compressing the signal, and outputting the compressed signal to the TDMA control unit 7 as a high-speed digital signal. Also, this mobile phone has a display 1
1, an operation unit including an input key 12, an operation control unit 13, and the like. The operation control unit 13 is constituted by a control microcomputer or the like, reads information such as a destination telephone number input from the input key 12, and displays a predetermined display corresponding to a state on the display 11 such as a liquid crystal display. To perform man-machine interface processing.

This portable telephone is provided with control means (for example, a central processing control unit) 14 for controlling the overall processing. The central processing control unit 14 includes a central processing unit (CPU), a memory storing a control program, and the like. The central processing control unit 14 outputs control information to be transmitted to the base station to the TDMA control unit 7 according to an operation signal given from the operation control unit 13 and broadcast information given from the TDMA control unit 7, It controls various parts in the mobile phone. The control of each unit in the mobile phone includes a reception unit 3, a transmission unit 4, a frequency synthesizer 5,
Control for stopping power supply to the modulation / demodulation unit 6, the TDMA control unit 7, and the like is included. Further, the central processing control unit 14
For example, when the control operation becomes unnecessary until the processing of the broadcast information or the information of the designated time slot is completed and the next broadcast information or the information of the designated time slot is transmitted, the pause time corresponding to the pause time Has the function of outputting the sleep information SLP for specifying In this mobile phone, a clock supply unit (for example, a clock oscillating unit 15 and a switch unit 16) for supplying a clock signal CLK as a reference for operation of the central processing control unit 14 and the like.
It has. The clock oscillating unit 15 continuously oscillates a clock signal CLK of a predetermined frequency (for example, 5 MHz), and a switch unit 16 is connected to an output side of the clock oscillating unit 15. The switch section 16 has first and second output terminals, and is switched to the first output terminal side when the pause signal SW applied to the control terminal is at level “L”, and when the pause signal SW is at level “H”. It can be switched to the second output terminal side. The first output side of the switch unit 16 is connected to a clock terminal of the central processing control unit 14. Further, a time output means (for example, a timer unit) 17 is connected to a first output side of the switch unit 16.

The timer section 17 includes a count section 17a and a signal output section 17b. The counting unit 17a
This is a preset-type down counter having a clock terminal, a parallel input terminal, and a parallel output terminal. The clock terminal is connected to a first output side of the switch unit 16. The parallel input terminal is supplied with pause information SLP from the central processing control unit 14, and the parallel output terminal is connected to the signal output unit 1
7b is connected to the input side. The counting unit 17a
An initial value is set by the sleep information SLP applied to the parallel input terminal, the count value is sequentially reduced by one from the initial value by the clock signal CLK applied to the clock terminal, and the count value is output to the parallel output terminal. Is configured. The signal output unit 17b is, for example, a 0 detector that outputs a detection signal of “L” when the count value output from the parallel output terminal of the counting unit 17a is 0, and outputs an “H” detection signal when the count value is other than 0. . The detection signal of the signal output section 17b is supplied to the control terminal of the switch section 16 as a pause signal SW.

Next, the operation will be described. When the power of the mobile phone is turned on, an initialization circuit (not shown) operates to set the initial value of the count unit 17a of the timer unit 17 to 0, and to reset each unit such as the central processing control unit 14 to the initial state. Is set. Further, the clock oscillating unit 15 starts an oscillating operation, and generates a clock signal CLK having a predetermined frequency. Since the value of the count unit 17a of the timer unit 17 is set to 0 by the initial setting circuit, the signal output unit 17b
Outputs an “L” detection signal, which is a pause signal SW.
Is given to the switch unit 16. Therefore, the switch unit 16 is switched to the first output side, and the clock signal CLK generated by the clock oscillation unit 15 is provided to the central processing control unit 14. In the central processing control unit 14, predetermined operations are sequentially started from an initial state based on the clock signal CLK. First, the receiving unit 3 and the frequency synthesizer 4
The power of the receiving system circuit is turned on, and a frame synchronization process for detecting a control channel including broadcast information from the base station and extracting a superframe timing is performed.

When the frame synchronization is established by the frame synchronization processing, the apparatus shifts to a standby state for waiting for a call from the base station. When the reception processing of the broadcast information or the information of the designated time slot from the control channel is completed in the standby state, the central processing control unit 14 stops the power supply to the circuit of the reception system and starts reception of the next control channel. Pause period (for example, about 700 m
The sleep information SLP having a value corresponding to s) is output. As a result, the count value of the counting unit 17a becomes the sleep information SL
Initially, the value specified by P is set, and the detection signal of the signal output unit 17b becomes “H”. Since the detection signal of the signal output unit 17b is given to the switch unit 16 as the pause signal SW, the switch unit 16 is switched to the second output side, and the clock signal CL generated by the clock oscillation unit 15 is output.
K is given to the count unit 17a. On the other hand, the supply of the clock signal CLK to the central processing control unit 14 is stopped, and the central processing control unit 14 is completely stopped.

In the counting section 17a, the clock signal CL
The countdown by K is started, the count value set by the sleep information SLP is sequentially reduced by one, and after the elapse of the sleep period, the count value of the counting unit 17a becomes 0. When the count value of the counting section 17a becomes 0, a "L" detection signal is output from the signal output section 17b, and this is supplied to the switch section 16 as a pause signal SW. Then, the switch unit 16 is switched to the first output side, and the clock signal CLK is supplied to the central processing control unit 14 again. As a result, the central processing control unit 14 turns on the power of the receiving system circuit, and the process of receiving the control channel from the base station is performed. When the reception processing is completed after about 20 ms, the central processing control unit 14 stops the power supply to the circuits of the reception system, enters a pause period until the start of reception of the next control channel, and the same operation is repeated.

As described above, the mobile phone of the present embodiment is
A central processing control unit 14 for outputting sleep information SLP having a value corresponding to the sleep period prior to the sleep period;
It has a timer section 17 for measuring the time set in the LP, and a switch section 16 for stopping the supply of the clock signal CLK to the central processing control section 14 during the operation of the timer section 17. Thereby, the operation of the central processing control unit 14 can be completely stopped during the suspension period. On the other hand, while the central processing control unit 14 is stopped, the counting operation is performed in the counting unit 17a. The circuit scale of the counting unit 17a is extremely small as compared with the central processing control unit 14, and the power consumption is small. Therefore, there is an advantage that power consumption due to unnecessary operation of the central processing control unit 14 can be reduced.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications (a) to (d). (A) In FIG. 1, a mobile phone has been described. However, the present invention is not limited to a telephone, but can be similarly applied to a TDMA mobile radio apparatus for data and the like. (B) The configuration of the switch unit 16 is not limited to the configuration of FIG. Any configuration can be applied as long as the supply of the clock signal CLK to the central processing control unit 14 can be stopped while the pause signal SW is supplied. (C) The configuration of the timer unit 17 is not limited to the configuration of FIG. Pause information SL given from central processing control unit 14
Any configuration can be applied as long as the pause signal SW can be output for a predetermined time based on P. (D) The channel arrangement of the TDMA scheme is not limited to the one illustrated in FIG. Further, the radio frequency used is not limited to the 800 MHz band.

[0018]

As described above in detail, according to the first aspect, according to the pause information given from the control means,
A timer means and a clock supply means are provided for stopping the supply of the clock signal to the control means during the suspension time specified by the suspension information. Thus, during the suspension time, the control unit is completely stopped, and there is an effect that unnecessary operation by the control unit is eliminated and power consumption can be reduced. According to the second aspect, the timing unit is constituted by the counting unit and the signal output unit. As a result, the power consumption of the counting unit that operates during the idle time of the control unit can be extremely reduced, and the power consumption can be reduced as a whole.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a mobile phone according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of channel allocation in a time domain in a TDMA mobile phone system.

[Explanation of symbols]

 Reference Signs List 1 antenna 3 reception unit 4 transmission unit 5 frequency synthesizer 6 modulation / demodulation unit 7 TDMA control unit 8 code decoding unit 14 central processing control unit 15 clock oscillation unit 16 switch unit 17 timer unit 17a count unit 17b signal output unit

Claims (2)

[Claims] 1. A wireless communication line temporally divided by a frame composed of a plurality of time slots,
In a mobile radio apparatus of a time division multiple access wireless communication system that performs communication using a communication time slot specified by broadcast information transmitted in a control time slot in the frame from a base station, The overall processing control including the reception processing and the communication processing for the specified communication time slot,
Control means for performing a pause based on a clock signal of a predetermined frequency; and when the control means receives pause information designating a pause time of the control operation, the pause time specified by the pause information is measured and the pause is measured. A timer for outputting a pause signal during the time; supplying the clock signal to the control unit when the pause signal is not output from the timer; and outputting the pause signal from the timer. And a clock supply means for stopping the supply of the clock signal. A clock oscillating section for continuously oscillating a clock signal of a predetermined frequency; and a clock signal oscillated by the clock oscillating section when the pause signal is not supplied. And a switch unit that switches and supplies the clock signal to the timer unit when the pause signal is supplied, wherein the clock unit has an initial value based on pause information provided from the control unit. A count unit that is set and the count value is sequentially updated by a clock signal supplied from a switch unit of the clock supply unit; and outputs the pause signal until the count value of the count unit reaches a predetermined value. 2. The mobile radio apparatus according to claim 1, comprising a signal output unit.