JP2008236357A - Radio communication equipment and control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a connection rate during an incoming call of radio equipment having a plurality of functions other than radio communication. <P>SOLUTION: The radio communication equipment is provided with a radio circuit 103 for performing a radio communication function, a function circuit 105 for taking on at least one function other than the radio communication function, and a control circuit 104 for performing at least one switching control among switching which is made so as to reduce the number of signal lines used in the function circuit, switching which is made to switch the signal line from signal end transmission to a signal line of differential transmission, and switching which is made so as to switch the signal line to low amplitude, wherein the radio circuit can perform radio communication while noise due to the function circuit is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus, and more particularly, to a method and apparatus suitable for improving connection efficiency of a mobile phone terminal or the like.

  Recently, not only a telephone function as a wireless communication device but also a number of functions such as a browser, a TV viewing function, a music playback function, a GPS (Global Positioning System), a camera function, and the like are mounted on a mobile phone terminal. For this reason, due to the effects of noise generated during the operation of these functions, in situations where the reception level of radio waves is low, a situation may occur in which connection cannot be established even when an incoming call is received, or disconnection occurs during communication. I came.

  Prior art documents searched in connection with a part of the technology of the present invention described later will be described. As a technique for connection switching control based on the reception level of radio waves, for example, in Patent Document 1, in a message base station apparatus, when the radio wave from the source mobile phone terminal by the reception level detection means is at a constant reception level, A configuration is disclosed in which switching is performed so as to connect to a destination mobile phone terminal via a normal base station device without going through. Further, in Patent Document 2, if there is an incoming call when the audio playback device is in the playback mode, the playback signal of the audio playback device is muted, and the ringer signal is supplied to the headphones instead of the playback signal. A mobile phone having a configuration in which a call can be made when an incoming call is notified and a user performs a key operation to receive an incoming call, and the audio playback device is in a stop mode is disclosed. However, the inventions of these prior art documents do not solve the problem that communication is disconnected or cannot be received due to the influence of noise generated during the operation of functions other than the communication function.

JP 2002-034074 A Japanese Patent No. 3159321

In order to solve the above problems, for example, in a prior application (Japanese Patent Application No. 2007-008416; when filing this application: unpublished)
・ Stop the function that generates noise,
・ Reduce the operating time or
-Change the operating clock frequency to a frequency where the lower frequency or harmonics do not match the received frequency band.
Thus, an invention has been proposed in which the connection success rate is improved without being affected by noise.

  An object of the present invention is to provide a method and apparatus for improving the connection success rate in a control mode different from that of the prior application.

  In order to solve the above-described problems, the invention disclosed in the present application is generally configured as follows.

  The present invention reduces the number of signal lines used in a function not directly involved in communication or reduces the amplitude of a signal when an incoming call is received in an environment where the reception level of radio waves is below a predetermined reference value (threshold). This makes it less susceptible to noise and improves the connection rate.

A wireless communication apparatus according to the present invention includes a wireless circuit that performs a wireless communication function,
A functional circuit having at least one function different from the wireless communication function;
Switching to reduce the number of signal lines used in the functional circuit,
The signal line is switched from a single-ended transmission form to a differential transmission form signal line,
Switching the signal line to low amplitude,
A control circuit that performs at least one of the switching control,
As a result of the switching control, the wireless circuit can perform wireless communication in a state where noise due to the operation of the functional circuit is reduced.

  In the present invention, the control circuit performs the switching control when the reception level is less than or equal to a predetermined reference value, and does not perform the switching control when the reception level is greater than the predetermined reference value.

In the present invention, the control circuit includes:
When the reception level is below a predetermined reference value, the switching control is performed,
Thereafter, when the reception level becomes larger than a predetermined reference value, in response to the switching control,
Return the number of signal lines used in the functional circuit to the original number,
Return the signal line from the differential transmission form to the original single-ended transmission form signal line,
Return the signal line from the low amplitude to the original amplitude,
The original state is restored by performing at least one switching control.
In the present invention, the control circuit performs the switching control when the reception level is equal to or lower than a predetermined reference value at the time of incoming call or communication connection.

A method according to the present invention is a method for controlling a wireless communication apparatus that has a functional circuit that performs a wireless communication function and has at least one function different from the wireless communication function,
Switching to reduce the number of signal lines used in the functional circuit,
The signal line is switched from a single-ended transmission form to a differential transmission form signal line,
Switching the signal line to low amplitude,
Perform at least one switching control,
Wireless communication can be performed in a state where noise due to the functional circuit is reduced.

  Further, according to the present invention, during communication, when the reception level of the desired wave is low, the same processing is performed and the communication is continued.

  In the present invention, when moving to an environment where the reception level is high during communication, control to restore the original state is performed.

  ADVANTAGE OF THE INVENTION According to this invention, the connection rate at the time of an incoming call can be improved in the radio | wireless communication apparatus which has several functions other than radio | wireless communication.

  The above-described present invention will be described below with reference to the accompanying drawings in order to explain in more detail. FIG. 1 is a diagram showing a configuration of a wireless communication apparatus (radio device) according to an embodiment of the present invention. Although not particularly limited, in the present embodiment, the wireless communication device includes a functional circuit corresponding to at least one of functions such as a browser, a TV viewing function, a music playback function, a GPS, and a camera function in addition to the wireless communication function. It is assumed that the mobile phone terminal provided. As illustrated in FIG. 1, the wireless communication device 101 includes an antenna 102, a wireless circuit 103, a control circuit 104, and a functional circuit 105. The antenna 102 receives a radio wave from a base station (not shown) and guides it to the radio circuit 103. The antenna 102 radiates the transmission wave generated by the wireless circuit 103 toward a base station (not shown).

  The radio circuit 103 is a circuit that transmits transmission data as a transmission wave from the antenna 102 and demodulates the reception data from the reception wave at the antenna 102. Although not particularly limited, the radio circuit 103 includes a receiving unit that performs low-noise amplification and quadrature demodulation of a signal received by the antenna 102, and a transmission unit that performs quadrature modulation and power amplification of the transmission signal to radiate a transmission wave from the antenna 102. A radio (RF) unit (not shown) provided, and a baseband processing unit (not shown) that encodes a transmission signal, supplies the signal to the radio unit, and performs baseband processing such as decoding of a reception signal from the radio unit I have. The baseband processing unit measures RSSI (Received Signal Strength Indicator) or the like and notifies the control circuit 104 of the measurement.

  The control circuit 104 controls the wireless circuit 103 and the functional circuit 105. The control circuit 104 determines whether the reception level measured by the wireless circuit 103 is equal to or lower than a predetermined reference value (threshold value) at the time of incoming call or communication connection, and based on the determination result, Switching control of the number of signals between the functional circuit 105 and the control circuit 104 is performed.

  The functional circuit 105 is a circuit that controls functions that are not directly used for wireless communication functions, such as LCD (Liquid Crystal Display), GPS, camera, LED (Light Emitting Diode), external memory, etc., which form a display device (not shown). . As described above, there are no countermeasures against noise generated during operation (for example, switching noise generated in a CMOS circuit or simultaneous switching noise in a parallel bus) due to improvement of the operating frequency of the functional circuit 105, expansion of the bus width, and the like. Otherwise, communication will be affected.

  In the following, for ease of explanation, the control circuit 104 and the functional circuit 105 are composed of a total of four signal lines, that is, a clock signal line CLK and three data signal lines DATA1 to DATA3 as shown in FIG. It shall be connected. In the present invention, it goes without saying that the number of signal lines is not limited to four.

  FIG. 3 is a flowchart showing a control procedure for stopping the use of the data signal lines DATA2 and DATA3 during communication in the control circuit 104 and the functional circuit 105 having the connection configuration shown in FIG. The operation of the present embodiment will be described with reference to FIGS.

  When the functional circuit 105 is driven by the clock of the clock signal line CLK and operates using the data signal lines DATA1 to DATA3, when there is an incoming call request from a base station (not shown) (step S1), control is performed. The circuit 104 determines whether or not the reception level is lower than the reference value (step S2). When the radio wave reception level is lower than the reference value (yes branch of step S2), the use of DATA2 and DATA3 is stopped. After that (step S3), an incoming call process is performed (step S4). If the radio wave reception level is higher than the reference value (no branch in step S2), the incoming call process is performed using the data signal lines DATA1 to DATA3 as they are (step S4).

  FIG. 4 is a diagram for explaining the operation in step S3 of FIG.

  As shown in FIG. 4A, from the state where signals are transmitted to the clock signal line CLK and the data signal lines DATA1 to DATA3 between the control circuit 104 and the functional circuit 105, as shown in FIG. Then, the use of the data signal lines DATA2 and DATA3 is stopped (for example, the LOW level is fixed), and the control is switched to the control using the clock signal line CLK and the data signal line DATA1. Then, the incoming call processing is performed in the connection state of FIG.

  As shown in FIG. 4B, the number of data signal lines to be used is set to one, so that noise is reduced as compared with the case of using all three data signal lines. For this reason, the incoming call processing is performed in a reduced noise environment (an environment in which EMI (Electro Magnetic Immunity) is reduced). Note that when the use of the data signal lines DATA2 and DATA3 is stopped, the control circuit 104 and the function circuit 105 are controlled so as not to transmit / receive data via the data signal lines DATA2 and DATA3, or FIG. In the connection configuration of 4 (A), after switching the data to be transferred via the data signal lines DATA2 and DATA3 to the connection configuration of FIG. 4 (B), DATA1 is originally transferred on the data signal line DATA1. The data may be transferred in a time-sharing manner and serially.

  Further, when an incoming call is received during an access operation to the external memory constituting the functional circuit 105 and the reception level is low, the control circuit 104 determines the number of data signal lines to the functional circuit 105. Reduce the data transfer rate.

  FIG. 5 is a waveform diagram for explaining the second embodiment of the present invention. In the present embodiment, when the radio wave reception level is equal to or lower than the reference value, the clock signal line CLK and the data signal lines DATA1 to DATA3 are connected to the differential signal line CLK− that handles two signals having opposite phases in a pair. , CLK +, DATA−, DATA + are switched to make the amplitude smaller than the normal time of the single end signal. In the case of single-ended transmission, if 0V is LOW (logic 0) and 2.5V is HIGH (logic 1), a transition between 0 and 1 requires an amplitude of 2.5V. On the other hand, in the case of differential signal transmission, if 2.1V is LOW (logic 0) and 2.5V is HIGH (logic 1), the potential difference (amplitude) required for the transition between 0 and 1 is 0. 4V is sufficient, and the amplitude can be reduced. In the differential signal transmission, the amplitude is reduced, the EMI is reduced, the noise resistance is improved, and the switching noise is canceled by two lines having opposite phases. Of the data signal lines DATA1 to DATA3, as in the first embodiment, only the data signal line DATA1 is switched to the differential transmission type signal line pair, and the other DATA2 and DATA3 are not used. It may be. When a single signal is changed from a single-ended signal to a differential signal, a pair of differential signal lines may be counted as one signal line.

  The operational effects of the above-described embodiment will be described.

  It is possible to improve the incoming call connection rate in an environment where the reception level of radio waves is low.

  It is possible to improve the communication sustainability in an environment where the radio wave reception level is low.

  Current consumption can be reduced by reducing the number of signal lines to be used.

  By reducing the amplitude of the signal, current consumption can be reduced.

  Further, unlike the prior application, it is not necessary to stop the operation of the function that generates noise. Further, it is not necessary to shorten the operation time (however, it may be shortened). Furthermore, it is not necessary to perform control to change the clock frequency to a low frequency or a frequency at which the harmonic does not match the reception frequency band. However, in this embodiment, the clock frequency may be changed.

  FIG. 6 is a diagram showing the configuration of the third exemplary embodiment of the present invention. In this embodiment mode, the number of signal lines used to connect the internal circuit 106 and the internal circuit 107 of the functional circuit 105 is reduced or the amplitude is reduced instead of the signal line connecting the control circuit 104 and the functional circuit 105. Control is performed. For example, when the functional circuit 105 is an LCD, noise is reduced by reducing the number of clock lines and data signal lines used in the data sent from the driver to the display panel, or by reducing the signal amplitude. ing. Needless to say, the third embodiment of the present invention and the switching control of the number of signal lines of the first embodiment may be combined.

  Although the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the configurations of the above-described embodiments, and various modifications that can be made by those skilled in the art within the scope of the present invention. Of course, including modifications.

It is a figure which shows the whole structure of the radio | wireless communication apparatus of one embodiment of this invention. It is a figure which shows the structure of one embodiment of this invention. It is a flowchart for demonstrating the control action of one embodiment of this invention. It is a wave form diagram explaining switching operation | movement of the control action of one embodiment of this invention, (A) is before switching, (B) is a wave form diagram after switching. It is a wave form diagram explaining the switching operation of the 2nd Embodiment of this invention. It is a figure which shows the structure of the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Wireless communication apparatus 102 Antenna 103 Wireless circuit 104 Control circuit 105 Functional circuit 106, 107 Internal circuit

Claims (12)

A wireless circuit for performing a wireless communication function;
A functional circuit having at least one function different from the wireless communication function;
Switching to reduce the number of signal lines used in the functional circuit,
The signal line is switched from a single-ended transmission form to a differential transmission form signal line,
Switching the signal line to low amplitude,
A control circuit that performs at least one of the switching control,
With
As a result of the switching control, a wireless communication apparatus that enables the wireless circuit to perform wireless communication in a state in which noise due to operation of the functional circuit is reduced. The control circuit includes:
When the reception level is below a predetermined reference value, the switching control is performed,
When the reception level is larger than a predetermined reference value, the switching control is not performed.
The wireless communication apparatus according to claim 1. The control circuit includes:
When the reception level is below a predetermined reference value, the switching control is performed,
Thereafter, when the reception level becomes larger than a predetermined reference value, in response to the switching control,
Return the number of signal lines used in the functional circuit to the original number,
Return the signal line from the differential transmission form to the original single-ended transmission form signal line,
Return the signal line from the low amplitude to the original amplitude,
By performing at least one switching control among them, the original state is restored.
The wireless communication apparatus according to claim 1. The control circuit performs the switching control when the reception level is equal to or lower than a predetermined reference value at the time of incoming call or communication connection.
The wireless communication apparatus according to any one of claims 1 to 3. A wireless circuit for performing wireless communication;
A functional circuit responsible for a function different from the wireless communication function;
A control circuit for controlling the wireless circuit and the functional circuit;
With
The control circuit includes:
When receiving an incoming call or wireless communication,
When the reception level at the radio circuit is below a predetermined reference value,
Switching control to reduce the number of signal lines between the control circuit and the functional circuit and / or the number of signal lines inside the functional circuit;
Wireless communication device. A wireless circuit for performing wireless communication;
A functional circuit responsible for a function different from the wireless communication function;
A control circuit for controlling the wireless circuit and the functional circuit;
With
The control circuit includes:
When receiving an incoming call or wireless communication,
When the reception level at the radio circuit is below a predetermined reference value,
The signal line between the control circuit and the functional circuit and / or the signal line inside the functional circuit is controlled to be switched to a differential signal.
Wireless communication device. When the reception level at the radio circuit is below a predetermined reference value,
The wireless communication apparatus according to claim 6, wherein an amplitude of the signal is reduced.   A mobile phone comprising the wireless communication device according to any one of claims 1 to 7. A control method in a wireless communication device having a functional circuit that performs a wireless communication function and has at least one function different from the wireless communication function,
Switching to reduce the number of signal lines used in the functional circuit,
The signal line is switched from a single-ended transmission form to a differential transmission form signal line,
Switching the signal line to low amplitude,
Perform at least one switching control,
As a result of the switching control, a method of controlling a wireless communication device that enables the wireless circuit to perform wireless communication in a state where noise due to operation of the functional circuit is reduced. When the reception level is below a predetermined reference value, the switching control is performed,
When the reception level is greater than a predetermined reference value, the switching control is not performed.
The method for controlling a wireless communication apparatus according to claim 9. The control circuit includes:
When the reception level is below a predetermined reference value, the switching control is performed,
Thereafter, when the reception level becomes larger than a predetermined reference value, in response to the switching control,
Return the number of signal lines used in the functional circuit to the original number,
Return the signal line from the differential transmission form to the original single-ended transmission form signal line,
Return the signal line from the low amplitude to the original amplitude,
By performing at least one switching control among them, the original state is restored.
The method for controlling a wireless communication apparatus according to claim 9. When the incoming call or communication connection, when the reception level is below a predetermined reference value, the switching control is performed.
The method for controlling a wireless communication apparatus according to any one of claims 9 to 11.

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