JP2007202045A - Personal digital assistant and program, and communication control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly execute both an additional function and a communication function in a personal digital assistant comprising the additional camera function in addition to the communication function. <P>SOLUTION: The personal digital assistant 100 comprises: a radio communication device 20 which performs radio communication; an additional function device 22 which operates on the basis of a predetermined clock signal; and a control device 21 in which a current communication channel corresponds to the harmonic wave component of the clock signal when the request of starting the additional function device is recognized, and which requests a shift from the current communication channel to another communication channel corresponding to an offset correction value to a radio base station when it is recognized that the offset correction value of a reception level is less than a reference value, and responds to the request of starting the additional function device when the new communication channel is allocated from the radio base station. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable information terminal having additional functions such as a camera and a television receiver in addition to a wireless communication function.

  In recent years, since the market of portable information terminals is maturing, differentiation from products of other companies has been achieved by increasing the functionality and performance of the terminals. For example, in the case of a mobile phone, additional functions such as a high-definition LCD, a digital camera, an external memory, a TV reception function, and a non-contact IC card function are provided in addition to the call and e-mail functions originally provided. Along with this, a CPU with a higher processing speed is installed in the terminal.

  By the way, while the convenience of the user is enhanced by the multi-function of the terminal, there is a problem that the operation of the additional function as described above hinders the wireless communication of the terminal. Specifically, for example, in a mobile phone, driving of the camera refers to giving noise to a radio signal. This is a phenomenon caused by the fact that the frequency of the radio signal matches the frequency of the harmonic component of the clock signal used by the camera.

  As a technique in view of the above phenomenon, for example, techniques described in Patent Document 1 and Patent Document 2 described below have been proposed. In the technology described in Patent Document 1, a wireless terminal detects a transmission channel period and a reception channel period during videophone communication, and stops outputting an imaging signal of a camera during the detection period. Is to prevent adverse effects on

The technique described in Patent Document 2, a portable information terminal with a camera is, by associating the operation time of the camera to the stop period of the intermittent receiving operation of the radio communication, the image processing of the radio communication and camera overlap Is to prevent.
JP 2001-186488 A JP 2005-045563 A

  According to the techniques described in Patent Document 1 and Patent Document 2, it is possible to prevent a failure in wireless communication due to the imaging process of the camera. However, in each of the above technologies, since the output of the imaging signal of the camera is interrupted in accordance with the wireless reception timing, the image displayed on the terminal seems to stop for a moment, or flicker may occur in the image. . Therefore, in the above technique, there is a possibility that the visibility and quality of imaging are deteriorated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for appropriately executing the operation of an additional function device such as a camera and wireless communication in a portable information terminal.

  The portable information terminal according to the present invention includes a wireless communication device that performs wireless communication, an additional function device that operates based on a predetermined clock signal, and a current communication channel that receives the activation request for the additional function device. When it recognizes that the offset correction value of the reception level corresponding to the harmonic component of the signal is less than the reference value, the wireless base station shifts from the current communication channel to another communication channel corresponding to the offset correction value. A control device that makes a request to the station and responds to the activation request for the additional function device when a new communication channel is allocated from the radio base station.

  The program according to the present invention allows a portable information terminal including a wireless communication device that performs wireless communication and an additional function device that operates based on a predetermined clock signal to recognize current communication when the activation request for the additional function device is recognized. When the channel corresponds to the harmonic component of the clock signal and the offset correction value of the reception level is less than the reference value, the current communication channel to another communication channel corresponding to the offset correction value The wireless base station is requested to shift, and when a new communication channel is allocated from the wireless base station, a response to the activation request for the additional function device is executed.

  ADVANTAGE OF THE INVENTION According to this invention, the failure | failure of the radio | wireless communication resulting from the action | operation of an additional function device can be prevented in a portable information terminal. In addition, since the portable information terminal executes the communication channel transition process prior to activation of the additional function device, the additional function device can be appropriately operated without causing a video flicker phenomenon or the like. Thereby, a user can use a portable information terminal comfortably.

  FIG. 1 is a block diagram showing a configuration of a mobile phone 100 according to an embodiment of the present invention. The radio processing circuit 2 is a radio communication device (20) that demodulates a radio signal received by an antenna 1 from a radio base station (not shown) and restores a baseband signal generated on the calling side. The baseband processing circuit 3 performs processing for outputting audio and image data included in the restored baseband signal, and processing for converting the input data into a baseband signal and supplying the baseband signal to the wireless processing circuit 2 I do.

  The CPU 4 is a control device (21) that controls the operation of the mobile phone 100. The receiver 5 and the microphone 6 are acoustic devices that serve as a receiver and transmitter during a call. The display device 7 is an LCD for displaying a screen, and the operation device 8 is a call button or a numeric keypad for user operation. The storage device 9 is a storage medium such as a flash memory and a RAM that holds programs executed by the CPU 4 and various data.

  The camera 10 that has an imaging function, the external memory 11 that is a storage medium that can be attached to and detached from the mobile phone 100, and the TV 12 that has a television reception function are additional function devices (22) of the mobile phone 100.

  The mobile phone 100 having such a configuration holds the channel correspondence table 31 in the storage device 9. The channel correspondence table 31 is information representing the relationship between the frequency of the harmonic component included in the clock signal used by the additional function device (22) and the communication channel of the corresponding radio signal.

  FIG. 2 shows an example of the channel correspondence table 31. The channel correspondence table 31 includes an additional function 31a which is a type of the additional function device (22), a clock harmonic correspondence channel 31b which is a communication channel corresponding to the harmonics of the clock signal, and a reception signal in the communication channel. A level offset value 31c used in an offset correction process related to an electric field level (hereinafter referred to as “reception level”) is set.

  In the illustrated channel correspondence table 31, for example, “CH1” and “CH2” are set as the clock harmonic correspondence channel 31b in the “camera” of the additional function 31a. This indicates that the harmonic components of the clock signal used for the operation of the “camera” correspond to the frequencies of “CH1” and “CH2” of the radio signal.

  In the channel correspondence table 31, the level offset value 31c “LO1” is set for “CH1” of the clock harmonic correspondence channel 31b. This indicates that “LO1” is used as an offset value in the later-described calculation of offset correction processing related to the reception level of “CH1”.

  The operation of the mobile phone 100 will be described with reference to the flowchart shown in FIG. Here, as an example, a control procedure when the camera 10 of the additional function device (22) is activated will be described. A series of controls of the mobile phone 100 described below corresponds to an action caused by the CPU 4 executing a program stored in the storage device 9.

  When the cellular phone 100 recognizes a start request of the camera 10 by a user operation (S301) in a standby state in which it receives a beacon signal from a wireless base station and waits for an incoming call or outgoing call instruction (S300), the current communication channel Is determined to correspond to the clock signal of the camera 10 (S302).

  In the above determination, the mobile phone 100 refers to the above-described channel correspondence table 31 (FIG. 2), and the communication channel currently used for communication with the radio base station is the clock harmonic of the additional function 31a “camera”. It is determined whether or not the corresponding channel 31b matches “CH1” or “CH2”.

  As a result of the determination, if the current communication channel is not “CH1” or “CH2” (S302: No), that is, if the current communication channel is not related to the operation of the camera 10, standby for wireless communication is performed on the communication channel. While continuing the state, the camera 10 is activated (S307).

  On the other hand, when the current communication channel is “CH1” or “CH2” related to the camera 10 (S302: Yes), the mobile phone 100 performs offset correction on the current reception level in the standby state, and sets the offset correction value. Ask for. More specifically, the level offset value 31c (FIG. 2) is subtracted from the reception level for the current communication channel. For example, if the current communication channel is “CH2” and the current reception level of “CH2” is “L1”, the offset correction value of the reception level is calculated from “L = L1−LO2” (S303). ).

  Subsequently, the mobile phone 100 compares the threshold value (Lth) notified from the radio base station regarding the reception level of the current communication channel with the offset correction value (L) obtained by the above calculation. The threshold (Lth) broadcast from the radio base station is a value that represents the lower limit of the reception level necessary for using the communication channel. If the current reception level is less than the threshold value (Lth), it means that proper wireless communication is difficult.

  As a result of the determination, if the offset correction value (L) is larger than the threshold (Lth) (S304: No), the mobile phone 100 activates the camera 10 while continuing the standby state using the current communication channel (S307). ). This control is based on the idea that even if the current communication channel corresponds to the clock harmonics of the camera 10, if the reception level is sufficiently large, it is difficult to be affected by the clock harmonics. .

  On the other hand, if the offset correction value (L) is less than the threshold value (Lth) as a result of the determination (S304: Yes), the mobile phone 100 uses the radio base station to shift the current communication channel to another communication channel. Is requested to change the communication channel (S305).

  When requesting a change in the communication channel, the mobile phone 100 notifies the radio base station of the offset correction value (L) as the current reception level. This is an operation in which the mobile phone 100 intentionally notifies the radio base station of a reception level lower than the actual level. As a result, it is possible to prompt a transition to another communication channel that is hardly affected by the operation of the camera 10.

  Thereafter, when a new communication channel is assigned by the radio base station, the mobile phone 100 performs a transition process to the communication channel (S306). This transition process is the same as that performed by a conventional mobile phone. When the processing is completed, the operation of the camera 10 is started to respond to the activation request for the camera 10 (S307).

  According to the embodiment described above, it is possible to prevent a failure in wireless communication due to the operation of the additional function device (22). Further, since the mobile phone 100 executes the communication channel transition process prior to the activation of the additional function device (22), the additional function device (22) can be appropriately operated without causing a video flicker phenomenon or the like. it can.

  Although the above description is related to the activation of the camera 10, the control procedure of the mobile phone 100 is the same as that described above even in the case of the external memory 11 and the TV 12 which are additional function devices (22) other than the camera 10. It is.

  Next, another embodiment of the present invention will be described. In the present embodiment, the communication channel is controlled based on the current reception level in the standby state after responding to the activation request of the additional function device (22). Note that the configuration of the mobile phone 100 of the present embodiment is the same as that shown in FIG.

  The mobile phone 100 records the reception level and priority regarding the transition of the communication channel for other communication channels that can be captured at the present time (hereinafter referred to as “peripheral channel”) except the current communication channel. The peripheral channel table 32 is provided.

  FIG. 4 shows an example of the peripheral channel table 32. In the peripheral channel table 32, the priority 32a regarding the transition of the communication channel, the peripheral channel 32b, and the reception level 32c thereof are recorded. In the peripheral channel table 32 shown in the figure, for example, “CH1” among the plurality of peripheral channels is given the highest priority “1” at the present time. This means that when the current communication channel needs to be changed, “CH1” is listed as the top candidate for a new communication channel.

  When recording the peripheral channel 32b and the reception level 32c in the peripheral channel table 32, the mobile phone 100 acquires information on the peripheral channel and the reception level in the same manner as the processing performed by the conventional mobile phone regarding the peripheral channel, and stores them. It may be stored in the storage device 9.

  The operation of the present embodiment will be described with reference to the flowchart shown in FIG. Here, it is assumed that the additional function device (22) in operation is the camera 10.

  The mobile phone 100 operates the camera 10 in a wireless communication standby state using the communication channel “CH10” (S600), and compares the current reception level (L10) with the threshold value (Lth) obtained from the wireless base station. As a result, if the current reception level (L10) is greater than the threshold (Lth) (S601: No), the application of the communication channel “CH10” is continued.

  On the other hand, when the current reception level (L10) is less than the threshold value (Lth) (S601: Yes), the mobile phone 100 performs the following control to shift the current communication channel to another communication channel.

  First, the mobile phone 100 refers to the channel correspondence table 31 and the peripheral channel table 32 described above, and confirms whether or not there is a peripheral channel corresponding to the clock high frequency of the camera 10 among the currently existing peripheral channels (S602). ). Here, “CH1” of priority 32a “1” in the peripheral channel table 32 of FIG. 4 exists in the channel correspondence table 31 of FIG. Therefore, the mobile phone 100 determines that there is a peripheral channel corresponding to the clock high frequency of the camera 10 (S602: Yes).

  If there is no peripheral channel corresponding to the clock high frequency of the camera 10 (S602: No), the mobile phone 100 uses the current communication channel as the peripheral currently recorded at the top of the peripheral channel table 32. Transition to a channel (S606). This migration process is the same as (S305) and (S306) in FIG.

  The cellular phone 100 determines whether or not the priority order of the peripheral channel (CH1) corresponding to the clock high frequency of the camera 10 is the highest (S603). Here, from FIG. 4, since “CH1” is the priority 32a “1”, it is determined that it is the highest (S603: Yes). If “CH1” is not the highest (S603: No), the current communication channel is shifted to the highest peripheral channel at the present time (S606).

  The mobile phone 100 performs offset correction on “CH1”, which is the highest peripheral channel at the present time, corresponding to the clock frequency of the camera 10, and compares the correction value with a threshold value (Lth) (S604). More specifically, the level offset value 31c “LO1” (FIG. 2) of “CH1” is subtracted from the current reception level 32c “A” (FIG. 4) of “CH1”, and the result is the threshold value (Lth). Compare with

  As a result of the comparison, when the offset correction value (A−LO1) is larger than the threshold (Lth) (S604: No), the mobile phone 100 shifts the current communication channel to the peripheral channel “CH1” (S606). Even if the peripheral channel “CH 1” corresponds to the clock high frequency of the camera 10, this control is considered to be hardly influenced by the camera 10 because the current reception level is sufficiently large. It is based on.

  If the offset correction value (A−LO1) is less than the threshold value (Lth) as a result of the comparison (S604: No), the mobile phone 100 changes the priority of the peripheral channel “CH1” from highest to lowest. The peripheral channel table 32 is rearranged to change to (S605). FIG. 6 shows the peripheral channel table 32 ′ after rearrangement. In the illustrated peripheral channel table 32 ', the lowest priority 32a "5" is set for "CH1", and the other peripheral channels are incremented by one.

  Further, the cellular phone 100 shifts the current communication channel to the highest communication channel at the present time based on the rearranged peripheral channel table 32 '(S606). That is, as shown in FIG. 6, since the highest peripheral channel is “CH6” at the present time, the mobile phone 100 shifts the communication channel from “CH10” to “CH6”.

  According to the embodiment described above, it is possible to avoid a communication failure due to a decrease in reception level during operation of the additional function device (22).

It is a block diagram which shows the structure of embodiment of the portable information terminal which concerns on this invention. It is explanatory drawing of the channel corresponding | compatible table in embodiment. It is a flowchart which shows the process sequence of embodiment. It is explanatory drawing of the periphery channel table in other embodiment of this invention. It is a flowchart which shows the process sequence of other embodiment. It is explanatory drawing of the periphery channel table in other embodiment.

Explanation of symbols

100 mobile phone 20: a wireless communication device, 21: control device, 22: additional function device 1: Antenna, 2: radio processing circuit, 3: baseband processing circuit, 4: CPU, 5: Receiver, 6: microphone, 7: Display device, 8: Operation device, 9: Storage device, 10: Camera, 11: External memory, 12: TV
31: Channel correspondence table, 32: Peripheral channel table

Claims (10)

A wireless communication device for performing wireless communication;
An additional function device that operates based on a predetermined clock signal;
When recognizing that the current communication channel offset correction value and the received level corresponding to the harmonic component of the clock signal you are less than the reference value when it recognizes a start request of the additional function device, the current communication A control device that requests the radio base station to shift from the channel to another communication channel corresponding to the offset correction value, and responds to the activation request for the additional function device when a new communication channel is allocated from the radio base station; A portable information terminal comprising:   If the control device recognizes that the reception level of the current communication channel is less than the reference value after responding to the activation request of the additional function device, the control device may select a higher harmonic of the clock signal among communication channels different from the current communication channel. 2. The portable information according to claim 1, wherein a communication channel that does not correspond to a wave component and has the highest reception level is selected, and a transition from the current communication channel to the selected communication channel is requested to the radio base station. Terminal.   The control device, after responding to the activation request for the additional function device, indicates that the reception level of the current communication channel is less than the reference value, and communication having the highest reception level among communication channels different from the current communication channel. When the channel corresponds to the harmonic component of the clock signal and the reception level is recognized to be larger than the reference value, the radio base station is requested to shift from the current communication channel to the communication channel different from the communication channel. The portable information terminal according to claim 1.   The portable information terminal according to any one of claims 1 to 3, wherein the additional function device is a camera. In a portable information terminal comprising a wireless communication device that performs wireless communication and an additional function device that operates based on a predetermined clock signal,
When recognizing that the current communication channel offset correction value and the received level corresponding to the harmonic component of the clock signal is less than the reference value when it recognizes a start request of the additional function device, the current communication Requests the radio base station to shift to another communication channel corresponding to the offset correction value from the channel, and responds to the activation request for the additional function device when a new communication channel is allocated from the radio base station A program characterized by letting In the portable information terminal,
After responding to the activation request of the additional function device, if the reception level of the current communication channel is recognized that does not satisfy the reference value, not correspond to the harmonic component of the clock signal in the communication channel different from the current communication channel and it selects the highest communication channel reception level, according to claim 5, wherein the program, characterized in that to execute to request transition from the current communication channel to the selected the communication channel to the radio base station not. In the portable information terminal,
After responding to the activation request for the additional function device, the current communication channel reception level is less than the reference value, and the communication channel having the highest reception level among communication channels different from the current communication channel is the clock signal. If the harmonic component corresponding to and the reception level is recognized that greater than a reference value, thereby executing to request transition from the current communication channel to the communication channel different from the communication channel to the radio base station The program according to claim 5. A portable information terminal comprising a wireless communication device that performs wireless communication and an additional function device that operates based on a predetermined clock signal,
When recognizing that the current communication channel offset correction value and the received level corresponding to the harmonic component of the clock signal is less than the reference value when it recognizes a start request of the additional function device, the current communication Requesting the radio base station to shift to another communication channel corresponding to the offset correction value from the channel, and responding to the activation request for the additional function device when a new communication channel is assigned by the radio base station. Communication control method. The portable information terminal is
After responding to the activation request of the additional function device, if the reception level of the current communication channel is recognized that does not satisfy the reference value, not correspond to the harmonic component of the clock signal in the communication channel different from the current communication channel 9. The communication control method according to claim 8, wherein a communication channel having a highest reception level is selected, and a transition from the current communication channel to the selected communication channel is requested to the radio base station. The portable information terminal is
After responding to the activation request for the additional function device, the current communication channel reception level is less than the reference value, and the communication channel having the highest reception level among communication channels different from the current communication channel is the clock signal. If the harmonic component corresponding to and the reception level is recognized that greater than a reference value, characterized by requesting a transition from the current communication channel to the communication channel different from the communication channel to the radio base station The communication control method according to claim 8.

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