JP2001332994A - Radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide radio equipment, which reduces noises generated from a control part 5, when operating a receiving part. SOLUTION: In the radio equipment, having a receiving part 4 for intermittently receiving signals and the control part 5 for controlling the respective parts of the radio equipment, operation in one part of the control part 5 is stopped in matching with the receiving operation of the receiving part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus for intermittently operating a receiving section and receiving voice and data, and more particularly to a radio apparatus in which the influence of noise generated from a logic circuit (logic circuit) of a control section is reduced. About.

[0002]

2. Description of the Related Art A mobile radio device such as a portable radio device establishes a communication line by radio waves with a radio base station, and transmits and receives voice, data, and the like wirelessly to perform communication. Unit, a receiving unit, and the like), and a control unit that controls the entire wireless device in an integrated manner. The control unit instructs the radio unit on the transmission / reception frequency and transmission output, and performs operations essential for communication such as encoding / decoding (digital modulation / demodulation) and communication such as screen display and memory dial management. The operation is not directly related.

[0003]

Since this control unit controls each unit irrespective of the transmission / reception cycle of the radio circuit, noise is generated from the logic circuit of the control unit even during reception, which affects reception sensitivity. Was given. That is, a harmonic having a frequency that is an integral multiple of the clock frequency for operating the logic circuit is generated in the radio frequency band, and becomes noise.

In addition, not only voice but also data can be handled (for example, WAP (Wireless Application)
With the advent of portable telephones, the processing amount of the control unit is increased, which is one of the causes of an increase in noise.

Further, the clock frequency supplied to the CPU is increased in order to improve the operation speed of the CPU and to improve the processing capability of the control unit. Occurs in the radio frequency band at the level. Since this harmonic noise affects the reception sensitivity, it is important to take measures to prevent noise generated from the logic circuit of the control unit from affecting other circuits.

However, in a small radio device such as a portable telephone, an electric circuit is mounted at a high density due to the miniaturization of the device, and a space between components is narrow.
Noise from a logic circuit often affects other circuits such as a wireless unit, and there is a limit to noise suppression.

An object of the present invention is to provide a radio device in which noise generated from the logic circuit during operation of the receiving unit is suppressed, noting that a logic circuit not required for communication may be stopped during reception. I do.

[0008]

According to a first aspect of the present invention, there is provided a wireless device having a receiving unit for intermittently receiving a signal and a control unit for controlling each part of the wireless device. At the same time, a part of the operation of the control unit is stopped. Further, in the first invention, it is also included that a part of the control unit pauses in synchronization with a receiving operation of a receiving unit.

According to a second aspect of the present invention, there is provided an antenna for capturing a radio wave propagating in a space, a receiving unit intermittently receiving the radio wave captured by the antenna, and a control unit for controlling each part of the wireless device. And suspending a part of the operation of the control unit during the reception operation of the reception unit.

In a third aspect, in the first and second aspects,
When the power supplied to a part of the control unit is cut off, a part of the operation of the control unit is stopped.

A fourth invention is the first or second invention, wherein
The control unit operates with a clock signal having a predetermined frequency, and suspends a part of the operation of the control unit when a clock frequency supplied to a part of the control unit decreases.

According to a fifth aspect, in the first to fourth aspects,
The wireless device is used in a time division multiple access system in which a receiving slot and a transmitting slot are repeated at a predetermined cycle, and the receiving unit performs an intermittent receiving operation so as to receive at least a receiving slot allocated to the wireless device. In a reception slot in which the receiving unit receives a signal, a part of the operation of the control unit is suspended.

According to a sixth aspect, in the first to fourth aspects,
The wireless device listens on a paging channel including a paging signal from a base station to a mobile station, and the receiving unit includes:
A signal is intermittently received so as to receive the paging channel, and a part of the operation of the control unit is suspended while the receiving unit receives the paging channel.

According to a seventh aspect, in the first to fourth aspects,
The radio is selected from a plurality of base stations, performs communication with a different frequency or a different spreading code with the base station, the receiving unit operates to measure the strength of a signal from the base station. While the receiving unit receives the signal for measuring the signal strength, the operation of the control unit is partially stopped.

According to an eighth invention, in the first to seventh inventions,
When the strength of the received signal is greater than a predetermined value, the control unit does not perform the pause operation.

According to a ninth aspect, in the first to eighth aspects,
The operation of the control unit is suspended in a part that is not necessary for wireless communication.

In a tenth aspect based on the first to eighth aspects, a part of the control unit which is not necessary for the wireless communication is a display control unit.

In an eleventh aspect based on the first to eighth aspects, the control unit has a plurality of CPUs, and suspending operation of the control unit includes suspending operation of at least one CPU.

In a twelfth aspect based on the first to eighth aspects, the control unit suspends execution of steps not required for wireless communication during the operation of the receiving unit.

In the first to twelfth aspects, the suspension of the control unit includes an operation state in which the control unit cannot substantially control the radio device. For example, operating the control unit at a low clock frequency or low voltage at a low speed, switching to a low-speed mode and operating, and the like are also included in the pause operation.

[0021]

According to the first invention, a part of the operation of the control unit is suspended in accordance with the reception operation of the reception unit, and the second invention is arranged such that the control unit is stopped during the reception operation of the reception unit. Since the operation of some of the is suspended, the noise generated from the control unit during the operation of the receiving unit can be reduced, and good reception sensitivity can be maintained.
No sensitivity suppression occurs.

According to the third aspect of the present invention, the operation of a part of the control unit is suspended by shutting off the power supplied to the part of the control unit, so that the occurrence of noise during reception can be reduced with a simple configuration. Can be.

According to the fourth aspect of the present invention, the operation of a part of the control unit is suspended by lowering the clock frequency supplied to a part of the control unit. Operation can be resumed.

According to the fifth aspect of the present invention, a part of the operation of the control unit is stopped in the reception slot, so that noise from the control unit in the reception slot is reduced, and good reception sensitivity can be ensured in the reception slot. .

According to the sixth aspect of the present invention, during the operation of receiving the paging channel, a part of the operation of the control unit is suspended, so that the noise during the receiving operation is reduced, and good reception sensitivity can be ensured on the paging channel. Yes, it will be possible to receive calls accurately.

According to the seventh aspect, during the measurement of the signal strength from the base station, a part of the operation of the control section is stopped, so that the noise during the operation of the receiving section is reduced, and the signal strength from the base station is reduced. It can be measured accurately.

According to an eighth aspect of the present invention, when the strength of the received signal is larger than a predetermined value, the pause operation of the control unit is not performed.
There is no need for complicated control.

According to a ninth aspect of the present invention, a part of the control unit which is not necessary for wireless communication is suspended, and in a tenth aspect of the present invention, the display control unit is suspended, so that the wireless communication is not affected and the wireless communication is not affected. It is possible to reduce the influence of noise generated from the logic circuit of the control unit and maintain good reception sensitivity.

According to an eleventh aspect, at least one CPU
Since the operation of (1) is stopped, noise can be easily reduced.

According to the twelfth aspect of the present invention, during the operation of the receiving unit, the control unit suspends execution of steps not required for wireless communication, so that the occurrence of noise during reception is reduced without providing a special circuit. Thus, good reception sensitivity can be maintained.

[0031]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of the mobile phone according to the present embodiment.

The antenna 1 is connected to the radio unit 2,
Radio waves from the radio base station are received and radio waves are transmitted to the radio base station. The wireless unit 2 includes a transmitting unit 3 and a receiving unit 4, and the transmitting unit 3 generates a high-frequency signal transmitted from the antenna 1. The receiving unit 4 amplifies the high-frequency signal received by the antenna 1, converts the frequency, and outputs the signal to the control unit 5 as a baseband signal. This baseband signal is demodulated into an audio signal by the modulation / demodulation unit 13 in the control unit 5. The modulation / demodulation unit 13 modulates the audio signal to generate a baseband signal (see FIG. 2).

The control unit 5 includes a radio unit 2, a display unit 8,
It controls each unit of the mobile phone, such as the input unit 9. For the radio section 2, the transmission / reception frequency and the output of the radio wave to be transmitted are controlled. The display unit (liquid crystal display) 8 sends character information and display data indicating the operating state of the mobile phone, and inputs characters and numbers from the input unit (keyboard) 9 and operates the mobile phone. Accept instructions. Thus, the control unit 5
The operation of (1) includes an operation essential for wireless communication such as control of the radio unit 2 and modulation and demodulation, and an operation not directly related to the wireless communication of control of the display unit 8 and the input unit 9.

Further, the portable telephone has a transmitting section 6 for converting an acoustic signal into an electric signal, and a receiving section 7 for converting an electric signal into an acoustic signal.

FIG. 2 is a block diagram showing a detailed configuration around the control unit 5. As shown in FIG.

The control unit 5 includes a central processing unit (CPU) 10
And executes the programs stored in the memories 15 and 16 at a predetermined clock frequency. This clock signal is supplied to the clock circuit 11 connected to the CPU 10.
Is supplied to the CPU 10. Each circuit of the control unit 5 inputs and outputs data according to the clock signal, and noise occurs at this time. This noise is transmitted to other circuits through a power supply pattern or a ground pattern on a printed circuit board or via a space, and particularly affects the receiving unit 4.

The control section 5 is provided with a modulation / demodulation section 13 having a digital signal processor (DSP) 12, and converts a baseband signal sent from the radio section 2 into an audio signal. The modulation / demodulation unit 13 is a data conversion unit 14
It converts data input from an external device (not shown) via the keyboard 9 or the interface connector (IO connector) 20 into data that can be modulated and demodulated, and sends the data to the modem 13.

The RAM 15 and the ROM 16 store data such as an identification number (ID) of the own device, a telephone number, and a program for operating the CPU 10, and are read and written by the CPU 10. The LCD driver 17 creates data for driving the liquid crystal display 8 as a display unit, and sends display data to the liquid crystal display 8 at a predetermined timing. Input / output controller 18
Converts the data into a data format and a data transfer rate suitable for the external device, and controls input / output of data from the infrared interface 19 and the interface connector 20 and input of data from the keyboard 9.

The switch 21 controls power supply to some circuits of the control unit 5. In the present embodiment, the contact of the switch 21 is opened, the power supply to the data conversion unit 14, the LCD driver 17, and the input / output control unit 18 is stopped, and the operations of these units are stopped. However, the present invention is not limited to such a configuration.

CPU 10, DSP 12, data converter 1
4, the RAM 15, the ROM 16, the LCD driver 17, and the input / output control unit 18 are connected via a bus, and are configured to exchange data with each other.

In the present invention, in order to reduce the influence of the noise generated by the control unit 5, a part of the operation of the control unit 5 is stopped at the timing when the reception unit 4 is operating. As described above, the control unit 5 performs operations that are indispensable for wireless communication and operations that are not directly related to wireless communication. Since the receiving unit 4 is the most susceptible to noise among mobile phones, it is important to reduce noise during operation of the receiving unit 4.

In this embodiment, when the receiving unit 4 is receiving a signal, the switch 21 causes the data converting unit 1 to operate.
4. The power supply to the LCD driver 17 and the input / output control unit 18 is cut off, and the operation of these circuits is stopped. on the other hand,
During transmission and standby, power is supplied to the data converter 14, LCD driver 17, and input / output controller 18 to perform normal operations.

For example, in the time division multiple access (TDMA) system, at the time of a reception slot during a call, the data conversion unit 14, L which is a circuit unnecessary for communication in the control unit 5 is used.
The operations of the CD driver 17 and the input / output control unit 18 are stopped.

FIG. 3 is a flowchart showing a procedure for stopping a part of the operation of the control unit 5 in the reception slot.

When the reception timing of the own device approaches, the control unit 5 suddenly stops the circuit in the middle of the data transfer and performs an error in the data before performing the suspension processing of a part of the circuit of the control unit 5. Data input / output (access) to the circuit to be stopped is prohibited so that no occurrence of
2). Then, the switch 21 is opened by the control unit 5,
A predetermined circuit, that is, the data converter 14, L
The power supply to the CD driver 17 and the input / output control unit 18 is cut off (step 103).

Next, in step 104, power is supplied to the receiving section 4 at its own reception timing, and the receiving section 4 is operated to receive a predetermined receiving slot or paging channel or the like (step 105). When the slot or the paging channel ends, the power of the receiving unit 4 is cut off, and the receiving unit 4 stops its operation (step 1).
06). Thereafter, the control unit 5 instructs the switch 21 to close the circuit, restarts the power supply to some of the circuits of the control unit 5 suspended in step 103, and restarts the operation of the circuit (step 107). Next, the prohibition of access to the circuit whose operation has been resumed is released (step 108).

These operations are repeatedly executed by the control unit 5 each time the reception timing of the own device approaches.

In this case, an operation has been described in which the power of the receiving unit 4 is cut off when the receiving unit 4 is not performing the receiving operation in response to the intermittent reception of the receiving unit 4. May be always supplied, or the operation of the control unit 5 may be restricted at the timing when the receiving unit 4 receives a signal.

Here, the above-mentioned operation status of the control unit 5 is summarized in Table 1.

[0051]

[Table 1]

At the time of standby and at the time of receiving a voice call, the CPU
10 controls the receiving unit 4, and the DSP 12 demodulates (decodes).
Since the RAM 15 and the ROM 16 are read and written along with these, the CPU 10, the RAM 15, the ROM 16
And the DSP 12 are always operating. On the other hand, the LCD driver 17 and the input / output control unit 1 which are not directly necessary for the reception operation
The switch 8 is controlled by the switch 21 to intermittently operate / stop in synchronization with the operation of the receiving unit 4. Further, the data conversion unit 14, which is required only for data communication, is stopped during standby and voice communication.

Similarly, when receiving data communication, the CPU
10 controls the receiving unit 4, and the DSP 12 demodulates (decodes).
Then, the data converter 14 converts the demodulated data signal, and the RAM 15 and the ROM 16 are read and written accompanying the data signal, so that the CPU 10, the RAM 15, the ROM 16,
The DSP 12 and the data converter 14 are always operating.
On the other hand, the LCD driver 17 and the input / output control unit 18 which are not directly necessary for the reception operation are controlled by the switch 21 so as to intermittently stop in synchronization with the operation of the reception unit 4.

As described above, in the first embodiment, at the time of transmission and standby, the circuits not necessary for the reception operation of the control unit 5 are operated to control the mobile phone, and at the time of reception, these circuits are stopped. Therefore, the noise generated from the control unit 5 during the operation of the receiving unit 4 can be reduced, so that the receiving band can be in a state where the noise is small.

Therefore, high-level harmonic noise does not occur in the reception band, good reception sensitivity can be maintained, and sensitivity suppression does not occur.

Further, since part of the operation of the control unit 5 is stopped by shutting off the power supply to the circuit for stopping the operation, noise generated from the logic circuit at the time of reception can be suppressed with a simple configuration, and good reception can be achieved. Sensitivity can be maintained.

Next, FIG. 4 shows a detailed configuration around the control unit 5 according to the second embodiment of the present invention.

Unlike the first embodiment, this embodiment has two CPUs, a main CPU (M-CPU) 10 and a sub CPU (S-CPU) 22.
The main CPU 10 performs control necessary for wireless communication,
The PU 22 performs control (screen control,
Keyboard control, etc.). DSP 12, modem 1
3. Data conversion unit 14, RAM 15, ROM 16, LC
The configurations of the D driver 17 and the input / output control unit 18 are the same as those of the first embodiment.

In this embodiment, in order to reduce noise from the control unit 5, the operation of the sub CPU 22 is stopped when the receiving unit 4 is operating.

For example, in the TDMA system, the operation of the sub CPU 22 is stopped at the timing of the reception slot during a call, and the sub CPU 22 is controlled to operate while the reception unit 4 is stopped (at the time of the transmission slot and at the time of idle).

Specifically, the main CPU 10 instructs the clock circuit 11 to lower the clock frequency applied to the sub CPU 22. The sub CPU 22 whose input clock frequency has decreased has no operation or enters an idle state operating at a low speed.

Further, the main CPU 10 is connected to the sub CPU
There is also a method of suspending the sub CPU 22 by adding a sleep signal to the sub CPU 22. This sleep signal may be configured to use a special signal line or to send a command to the sub CPU 22 via a bus.

Further, the power supply to the sub CPU 22 may be cut off, or the power supply voltage supplied to the sub CPU 22 may be reduced to make the sub CPU 22 idle.

As described above, in the second embodiment, at the time of transmission and standby, the sub CPU 22 of the control unit 5 which is not necessary for the reception operation is operated to control the mobile phone, and at the time of reception, the sub CPU 22 is stopped. Therefore, the noise generated from the control unit 5 during the operation of the receiving unit 4 can be reduced, so that the receiving band can be in a state where the noise is small.

Therefore, high-level harmonic noise does not occur in the receiving band, and the receiving section 4 is not suppressed in sensitivity, so that good receiving sensitivity can be maintained.

Since the amount of data transferred in the control unit 5 decreases due to the suspension of the sub CPU 22, the receiving unit 4
The noise generated from the control unit 5 during the operation can be further reduced.

Also, by lowering the clock frequency supplied to the sub CPU 22 or
By suspending the operation of the sub CPU 22 by adding a sleep signal to the sub CPU 22, the operation can be quickly resumed when the sub CPU is restarted.

Further, since the operation of the sub CPU 22 is stopped by cutting off the power supply to the sub CPU 22, the operation of the sub CPU 22 can be stopped with a simple configuration, and the noise generated from the logic circuit during reception can be suppressed. it can.

In the above-described embodiment, the operation of some circuits of the control unit 5 is suspended during the reception operation of the reception unit 4, but the control unit 5 does not control steps that are not necessary for wireless communication. In this way, the processing amount of the control unit 5 can be reduced, and the generation of noise can be suppressed.

With such a configuration, the generation of noise during reception can be reduced and good reception sensitivity can be maintained by software control without providing a special circuit configuration.

FIG. 5 shows the state of generation of harmonics of the clock signal.

In this figure, a 27.8 MHz clock signal is used, and a second harmonic (55.6 MHz) and a third harmonic (8
3.4 MHz) and a harmonic (n-th harmonic) having a frequency that is an integral multiple of the clock frequency. Therefore, the harmonic of 861.8 MHz which is the 31st harmonic enters the reception band (860 to 885 MHz) of the PDC system.

FIG. 6 is a diagram showing the waveform of a desired wave in an ideal state. What is indicated by one waveform in the reception band is a desired signal which is a downlink signal from the base station to the mobile station. The mobile station tunes to the desired wave and selectively receives it.

FIG. 7 is a diagram showing a state in which sensitivity suppression has occurred due to interference. When an interference wave due to high-level noise is generated in the reception band, the reception sensitivity is extremely deteriorated due to, for example, saturation of the input amplifier of the reception unit 4, and a signal having a strength lower than the noise signal is received. And sensitivity suppression occurs. In the present invention, by reducing such noise generated from the control unit 5 during reception, it is possible to maintain good reception sensitivity.

Next, the operation timing of the control unit 5 will be specifically described based on the slot arrangement in each mobile communication system.

FIG. 8 shows a PDC (Personal Digital) which is a digital car telephone system adopted in Japan.
7 is a timing chart showing a slot arrangement of a tal cellular system. From the top, the timings of a downlink signal from the base station (BS) to the mobile station (MS), an uplink signal from the mobile station to the base station, a transmission / reception signal of the mobile station 1 and a transmission / reception signal of the mobile station 2 are shown. .

In the PDC system, one subframe is divided into three slots. In order for the mobile station and the base station to communicate, the full-rate mobile station uses one slot for transmission and reception in one subframe, and the half-rate mobile station uses one slot for transmission and reception in two subframes. . In this figure, the mobile station 1 uses the full rate, and the mobile station 2 uses the half rate. The transmission / reception timing between the base station and the mobile station is such that, for example, the downlink signal transmitted from the base station in the slot of TB-M1 is transmitted to the mobile station 1 by RB-M1.
Received in the slot. On the other hand, TM1-
The uplink signal transmitted to the base station in the B slot is received by the base station in the RM1-B slot. In the figure, I (idle) is the timing when the mobile station is not performing a transmission / reception operation, and LM is the timing for measuring the reception level for switching the diversity antenna.

At the timing as described above, the mobile station operates so as to repeat three states of transmission, reception and idle at a constant period.

FIG. 9 is a timing chart showing the operation of the control unit 5 during a call in the PDC system. The mobile station operates the receiving unit 4 so as to receive the downlink signal from the base station in the reception slot allocated to the mobile station as described above.

FIG. 9 shows the transmission / reception timing of the full rate device, and the level measurement time (LM in FIG. 8) is omitted. At this time, in the reception slot (Rx), a part of the control of the control unit 5 is prohibited (operation is stopped), and the generation of noise from the control unit 5 in the reception slot is reduced. On the other hand, in the transmission slot (Tx) and during standby (idle), the control unit 5 performs a normal operation (Logic unit control).

As described above, in the PDC system, since one receiving slot is as short as 6.6 milliseconds, the operation of a part of the control unit 5 (for example, the LCD controller 17) which is not directly related to the receiving operation is stopped. However, there is no control problem such as a disturbed screen.

FIG. 10 shows a digital cordless telephone system PHS (Personal Handyphone).
FIG. 5 is a timing chart showing an operation of the control unit 5 during a call in an (e System) system.

In the PHS system, one TDD / TDMA
Four reception slots and four transmission slots are arranged in a frame. A mobile station receives a signal in reception slot 1 (R
If 1) is used, the receiving unit 4 operates only during R1 (RX ON), and the receiving unit 4 is used in other slots.
Is not operating (RX OFF). In response to the intermittent operation of the receiving unit 4, the control unit 5 operates to stop a part. That is, while the receiving unit 4 is operating, a part of the operation of the control unit 5 is stopped, and while the receiving unit 4 is stopped, the control unit 5 is operating.

As described above, the circuits unnecessary for reception in the control unit 5 are stopped in the reception slot allocated to the own device, and these circuits are operated during transmission and standby to control the portable telephone. In addition, the noise generated from the control unit 5 in the reception slot can be reduced, and the reception band can be in a state where the noise is small. Therefore, noise generated from the control unit 5 during operation of the receiving unit 4 can be reduced, and good receiving sensitivity can be maintained.

FIG. 11 is a timing chart showing an operation state of the control unit 5 at the time of standby in the PDC system.

In FIG. 9, it has been described that the operation / stop of a part of the control unit 5 is controlled corresponding to the reception slot in the PDC system. By doing so, generation of noise can be reduced.

In the PDC system, a paging channel (PC) for calling a mobile station by a base station is provided in a superframe composed of 36 subframes. The receiving unit 4 intermittently receives a signal according to the timing of the paging channel so as to receive only the channel. In response to the intermittent reception of the receiving unit 4, the control unit 5 operates to stop a part of the receiving unit 4. That is, during the receiving operation of the receiving unit 4, a part of the operation of the controlling unit 5 is stopped. The control unit 5 continues to operate while the signal is not being received by the control unit 4.

Similarly, FIG. 12 is a timing chart showing the operation of the control unit 5 during standby in the PHS system.
Even in the PHS system, a part of the operation of the control unit 5 during standby /
By controlling the stop, it is possible to reduce the generation of noise generated from the control unit 5. LCC in PHS system
Paging channels (P1 to P4) are provided for each paging group in the H superframe, and the mobile station receives a paging signal corresponding to the paging channel of the paging group assigned to the mobile station.

In FIG. 12, the mobile station is assigned the incoming call group of P1, and the receiving section 4 receives signals intermittently so as to receive only P1. In response to this, the control unit 5 is controlled so as to partially stop. That is, during the receiving operation of the receiving unit 4, a part of the operation of the control unit 5 is stopped, and while the receiving unit 4 is not receiving a signal, the control unit 5 is stopped.
Is working.

FIG. 13 is a timing chart showing the operation of the control unit 5 during standby in the IMT2000 system which is the next-generation mobile communication system. In the IMT2000 system, a paging channel is provided in each frame, and a mobile station on standby receives a paging signal corresponding to the paging channel. In response to the intermittent receiving operation of the receiving unit 4, the control unit 5 operates to stop a part,
As described above, during the receiving operation of the receiving unit 4, a part of the operation of the control unit 5 is stopped, and while the receiving unit 4 is not receiving a signal, the control unit 5 is operating.

As described above, the circuits unnecessary for reception in the control unit 5 are suspended in the paging channel allocated to the own device, and these circuits are operated during transmission and standby to control the mobile phone. In addition, noise generated from the logic unit at the time of reception can be suppressed, and the reception band can be set to a state with little noise.

Therefore, good reception sensitivity can be maintained, and no data is lost during the call, so that the call can be accurately received.

FIG. 14 shows another embodiment.
9 is a flowchart showing a procedure for intermittently operating a part of the control unit 5 when a reception electric field is weak.

When the reception timing of the own station approaches, the control unit 5 refers to the previously received and stored electric field strength (RSSI) of the base station, and if the value is larger than a predetermined value, the control unit 5 Is determined to be hardly affected by noise (step 112), and a part of the control unit 5 is not stopped. On the other hand, if the electric field strength of the base station is lower than a predetermined value, it is determined that the base station is susceptible to noise (step 1).
12) Execute a part of the stop processing of the control unit 5 (steps 113 to 119). Hereinafter, steps 113 to
The processing in step 119 corresponds to steps 102 to 1 described above with reference to FIG.
Since the process is the same as the process of step 08, the description is omitted.

As described above, during reception, the circuits of the control unit 5 that are not necessary for reception are suspended, so that the noise generated from the control unit 5 during the reception operation of the reception unit 4 is reduced, and the noise is reduced to the reception band. In addition to being able to reduce the number,
When the intensity of the received signal is sufficiently strong and the influence of noise can be neglected, the control unit 5 is not paused, so that complicated control is not required and the processing of the control unit 5 can be sped up.

When the mobile station detects that the radio wave from the base station to which the mobile station is currently connected has become weak, the mobile station searches for another base station to which the mobile station is connected, and transmits the stronger signal to another base station. Switch the connection destination to the station (handover). At this time, the strength of the signal from the adjacent base station is measured in order to connect to the base station that sends the strongest signal. When measuring the signal strength, by stopping the operation of a circuit unnecessary for the reception electric field measurement of the control unit 5, the electric field strength of the signal can be accurately measured in an environment with little noise.

FIG. 15 is a flowchart showing a procedure in which the base station stops a part of the operation of the control section 5 when measuring the electric field in such a case.

When measuring the electric field strength of the base station at the time of the handover, the control unit 5 suddenly stops the circuit during the data transfer and performs a data error before performing the pause processing of some of the circuits. In order to prevent the occurrence of the error, the input / output (access) of data to the circuit to be stopped is prohibited (step 13).
2) Open the switch 21 to cut off the supply of power to the predetermined circuit (step 133). As a result, in the above-described first embodiment, the power supply to the data conversion unit 14, the LCD driver 17, and the input / output control unit 18 is shut off, and the operations of these units are stopped.

Thereafter, the receiving unit 4 receives the signal at its own reception timing.
Is supplied (step 134), and the receiving unit 4 is operated to measure the received electric field strength of the adjacent base station at a predetermined timing (step 135). After measuring the strength of the reception electric field in this way, the power supply of the reception unit 4 is cut off,
The receiving unit 4 suspends the operation (Step 136). After that, the control unit 5 instructs the switch 21 to close the circuit, restarts the power supply to some circuits of the control unit 5 stopped in step 133, and restarts the operation of the circuit (step 137). The prohibition of access to the circuit whose operation has been resumed is released (step 138).

These operations are repeatedly performed by the control unit 5 at each timing of the electric field measurement of the adjacent base station.

As described above, when measuring the electric field strength of the base station at the time of handover, the circuits not necessary for the electric field strength measurement in the control unit 5 are stopped, and these circuits are operated during transmission and standby. Since the control of the mobile phone is performed, it is possible to suppress the noise generated from the control unit 5 at the time of measuring the electric field strength, and to reduce the noise in the reception band.

Therefore, the electric field intensity can be accurately measured during the operation of the receiving unit 4 at the time of the electric field intensity measurement, and the handover can be accurately performed to the base station having good conditions.

[Brief description of the drawings]

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

FIG. 2 is a block diagram around a control unit according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a procedure for stopping a part of the operation of a control unit in a reception slot.

FIG. 4 is a block diagram around a control unit according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a generation state of a harmonic of a clock frequency.

FIG. 6 is a diagram showing a desired wave in an ideal state.

FIG. 7 is a diagram illustrating a state where sensitivity suppression has occurred due to interference.

FIG. 8 is a timing chart showing a slot arrangement of the PDC system.

FIG. 9 is a timing chart showing the operation of the control unit during a call in the PDC system.

FIG. 10 is a timing chart showing the operation of the control unit during a call in the PHS system.

FIG. 11 is a timing chart showing the operation of the control unit at the time of standby in the PDC system.

FIG. 12 is a timing chart showing the operation of the control unit at the time of standby in the PHS system.

FIG. 13 is a timing chart showing the operation of the control unit during standby in the IMT2000 system.

FIG. 14 is a flowchart showing a procedure for intermittently operating a part of the control unit when the reception electric field is weak.

FIG. 15 is a flowchart showing a procedure for stopping a part of the operation of the control unit when measuring the electric field of the base station.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 radio unit 3 transmission unit 4 reception unit 5 control unit 6 transmission unit 7 reception unit 8 display unit (liquid crystal display) 9 input unit (keyboard) 10 CPU (main CPU) 11 clock circuit 12 digital signal processor (DSP) 13 Modulator / demodulator 14 Data converter 15 RAM 16 ROM 17 LCD driver 18 Input / output controller 19 Infrared interface 20 Interface connector 21 Switch 22 Sub CPU

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K011 DA05 DA29 EA01 FA07 GA01 GA06 JA01 JA03 KA04 5K028 AA15 BB04 DD02 LL41 5K067 AA24 BB04 CC22 EE02 EE10 EE71 EE72 KK06

Claims (12)

[Claims] In a wireless device having a receiving unit that intermittently receives a signal and a control unit that controls each unit of the wireless device, a part of the control unit is adjusted in accordance with the receiving operation of the receiving unit. A wireless device that suspends operation. 2. An antenna for capturing a radio wave propagating in space, a receiving unit intermittently receiving the radio wave captured by the antenna, and a control unit for controlling each part of the wireless device In the wireless device, a part of the operation of the control unit is suspended during the receiving operation of the receiving unit. 3. The wireless device according to claim 1, wherein the operation of a part of the control unit is suspended by shutting off power supplied to a part of the control unit. 4. The control unit operates by a clock signal of a predetermined frequency, and suspends a part of the operation of the control unit by reducing a clock frequency supplied to a part of the control unit. The wireless device according to claim 1 or 2, wherein: 5. The wireless device is used in a time division multiple access system in which a receiving slot and a transmitting slot are repeated at a predetermined cycle, and the receiving unit receives at least a receiving slot allocated to the own device. 5. The wireless communication device according to claim 1, wherein a part of an operation of the control unit is suspended in a reception slot in which a reception operation is performed intermittently and the reception unit receives a signal. 6. Machine. 6. The radio device listens on a paging channel including a paging signal from a base station to a mobile station,
The receiving unit may intermittently receive a signal to receive the paging channel, and suspend a part of the operation of the control unit while the receiving unit receives the paging channel. The wireless device according to claim 1. 7. The wireless device selects from a plurality of base stations, performs communication with the base station using different frequencies or different spreading codes, and operates the receiving unit to transmit a signal from the base station. The strength of the control unit is measured, and while the receiving unit receives a signal for measuring the signal strength, a part of the operation of the control unit is suspended. The wireless device described in. 8. The wireless device according to claim 1, wherein the pause operation of the control unit is not performed when the strength of the received signal is greater than a predetermined value. 9. The apparatus according to claim 1, wherein the operation of the control unit is suspended in a part not necessary for wireless communication.
The wireless device according to any one of items 1 to 8. 10. The wireless device according to claim 9, wherein the part of the control unit not required for the wireless communication is a display control unit. 11. The method according to claim 1, wherein the control unit has a plurality of CPUs, and suspending operation of the control unit includes suspending operation of at least one of the CPUs.
8. The wireless device according to any one of 8. 12. The wireless device according to claim 1, wherein the control unit suspends execution of steps not required for wireless communication during the operation of the receiving unit.