JP5065094B2 - Mobile communication terminal - Google Patents

Description

  The present invention relates to a mobile communication terminal.

  Conventionally, various mobile communication systems such as PDC (Personal Digital Cellular), W-CDMA (Wideband Code Division Multiple Access), cdma2000 1x, PHS (Personal Handy-phone System), wireless LAN (Local Area Network), Bluetooth, etc. Wireless communication systems are being operated. Also, standardization of high-speed wireless communication such as WiMAX (Worldwide Interoperability for Microwave Access) is being promoted. Each of these wireless communication systems has different characteristics.

  For example, since the PHS has a small cell area, the PHS has an advantage that the number of usable terminals per unit area can be increased and the frequency utilization efficiency is high. In addition, the PHS terminal only needs to receive the individual call signal (PCH: Paging Channel) while capturing the base station (CS: Cell Station), and since the interval is long, the advantage is that the standby time is long. There is also. However, since the area covered by one cell is small, there is a drawback that communication is likely to be interrupted if communication is performed while moving at a high speed.

  On the other hand, for example, since W-CDMA has a large cell area, it can be used while moving over a wide range at high speed. However, since the W-CDMA terminal performs despreading processing and the like in incoming call monitoring, cell signal level monitoring, and the like, the standby time is significantly shorter than that of the PHS terminal.

  Furthermore, the wireless LAN represented by IEEE (Institute of Electrical and Electronic Engineers) 802.11b, which is widely used, has hot spots arranged in coffee shops and public facilities, and can perform communication of up to 11 Mbps. it can. However, since this wireless LAN is assumed to be used indoors, the cell area is as small as about 10 m in radius.

  Recently, multi-mode portable communication terminals that can seamlessly use different wireless communication systems have been studied. For example, a mobile communication terminal that switches a wireless communication system according to the moving speed of the terminal or switches between wireless communication systems by determining the length of standby time in a plurality of wireless communication systems based on the remaining battery level is known. (For example, refer to Patent Document 1).

JP 2004-235863 A

  Conventionally proposed multi-mode mobile communication terminals are premised on incorporating a plurality of wireless communication means corresponding to a plurality of wireless communication systems in the terminal.

  On the other hand, as a multi-mode compatible mobile communication terminal as described above, a wireless communication unit of a main wireless communication system (hereinafter also referred to as a main system as appropriate) is built in, and a wireless communication such as a wireless LAN or Bluetooth as a subordinate. A wireless communication means of the system (hereinafter also referred to as a sub system as appropriate) may be configured to be added via an interface by inserting an SD card (Secure Digital card), USB (Universal Serial Bus) connection, or the like.

  In the mobile communication terminal having such a configuration, since the secondary system is added via an interface, generally, power consumption required for communication in the secondary system is less than power consumption required for communication in the main system. However, since each communication system is an independent system, communication can be performed simultaneously. For this reason, especially when the battery voltage is low, communication was possible in either one of the systems, but communication in both systems was performed at the same time. May occur, the terminal is turned off, and both cannot communicate.

  For example, when a call is made to make a call in the main system while browsing in the sub system, the power may be turned off. In this case, browsing in the secondary system may be continued unless the main system that consumes more power than the secondary system is activated. Similarly, the power may be turned off when a call from the main system is answered while browsing in the sub system. In this case as well, browsing in the secondary system may continue unless the main system that consumes more power than the secondary system is activated.

  Furthermore, while browsing in the secondary system, the main system started receiving data of a broadcast / multicast service (Broadcast / Multicast Services: hereinafter abbreviated as BCMCS as appropriate) according to the schedule. In some cases, the power is turned off. In this case, it is difficult to acquire BCMCS data to the end because the original battery level is low, and it will be necessary to acquire data by unicast later, and it is easy to predict that browsing will be redone. It is beneficial to be able to use the service that the user wants to use now. In this case, if reception of BCMCS data by the main system is refrained, browsing in the sub system can be continued without turning off the terminal.

  In addition, when only the secondary system is communicating as described above, if the power supply of the mobile communication terminal itself turns off unexpectedly regardless of user operation, the battery is charged by connecting a charger to the terminal. However, if communication is continued, power is supplied only to the wireless communication means of the secondary system (hereinafter also referred to as sub-communication means as appropriate), not to the wireless communication means of the main system (hereinafter also referred to as main communication means as appropriate). Then, it is conceivable to perform communication. In this case, although the power supply of the terminal itself is turned on, a method of turning on the power supply of the main communication means by a user operation and a method of automatically turning on the charging start can be considered.

  However, when the power of the main communication means is turned on by a user operation as in the former, if the user forgets to turn on the power, even if there is an incoming call or the like by the main system, a response cannot be made. In addition, depending on the user, when charging is started by connecting a charger to the terminal, there is a case where the main communication means is immediately turned on to start communication. In this case, if the power button of the main communication means is shared with the power button of the terminal, it cannot be determined whether the power of the terminal itself is to be turned off or whether the main communication means is to be turned on.

  On the other hand, as in the latter case, when the main communication means and the sub communication means are automatically turned on when charging is started, the power supplied from the charger is almost consumed by the main communication means and the sub communication means. Therefore, it takes a long time to charge the battery. For this reason, if the user unplugs the charger for some reason before the battery voltage reaches a predetermined voltage, the terminal is immediately turned off.

  As described above, in a portable communication terminal to which sub-communication means can be added, the power supply of the terminal itself may be turned off by the operation of the main communication means due to the battery voltage. Also, in this case, when charging of the battery is started, the operation for returning the main communication means is forgotten and it becomes impossible to respond to an incoming call or the like. There is a concern that an unexpected situation may be caused to the user, such as the power being turned off.

  Accordingly, an object of the present invention made in view of such a point is that multimode communication according to the battery voltage can be efficiently performed, and when charging of the battery is started by stopping the main communication means, it is unexpected for the user. Accordingly, it is an object of the present invention to provide a mobile communication terminal that can appropriately restore the main communication means without causing the above situation and improve the convenience for the user.

The invention of the mobile communication terminal according to claim 1 that achieves the above object is as follows:
First wireless communication means corresponding to the first wireless communication system;
An interface corresponding to a second wireless communication system and capable of detachably connecting a second wireless communication means that consumes less power than the first wireless communication means;
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the first wireless communication means and the second wireless communication means are communicating and the battery voltage detected by the battery voltage detection means is equal to or lower than a first predetermined value, the first wireless communication means is used. Control means for controlling to a stop state;
A power control unit for turning the power on and off;
When the power operation unit is operated in a state where the first wireless communication unit is disabled by the control unit, whether the first wireless communication unit is enabled or the power is turned off. Display means for displaying a screen to be selected;
It is characterized by having.

The invention according to claim 2 is the portable communication terminal according to claim 1,
A detection unit for detecting whether or not the battery is being charged;
When it is selected that the first wireless communication unit is enabled, the control unit controls the first wireless communication unit to the enabled state,
When the battery voltage detected by the battery voltage detection means is equal to or lower than a second predetermined value higher than the first predetermined value in a state where the detection unit detects charging, the display means Is displayed to indicate that the first wireless communication means is controlled to be disabled when
It is characterized by this.

The invention according to claim 3 is the portable communication terminal according to claim 2,
When the battery voltage detected by the battery voltage detection means exceeds the second predetermined value in a state in which the detection unit is detecting charging, the display means is 1 A message indicating that the wireless communication means is not controlled to be suspended is displayed.
It is characterized by this.

Furthermore, the invention of the mobile communication terminal according to claim 4 that achieves the above object is as follows:
First wireless communication means corresponding to the first wireless communication system;
An interface that allows external devices to be detachably connected;
Determining means for determining whether or not the external device connected to the interface is a second wireless communication means compatible with the second wireless communication system and consuming less power than the first wireless communication means; ,
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the determination unit determines the connection of the second wireless communication unit, the first wireless communication unit is in communication mainly receiving, and the battery voltage detected by the battery voltage detection unit is third. A control means for controlling the first wireless communication means to be in a use stop state when a predetermined value or less;
A power control unit for turning the power on and off;
When the power operation unit is operated in a state where the first wireless communication unit is disabled by the control unit, whether the first wireless communication unit is enabled or the power is turned off. Display means for displaying a screen to be selected;
It is characterized by having.

The invention according to claim 5 is the portable communication terminal according to claim 4,
A detection unit for detecting whether or not the battery is being charged;
When it is selected that the first wireless communication unit is enabled, the control unit controls the first wireless communication unit to the enabled state,
When the battery voltage detected by the battery voltage detection means is lower than a fourth predetermined value higher than the third predetermined value in a state where the detection unit detects that charging is in progress, the display means Is displayed to indicate that the first wireless communication means is controlled to be disabled when
It is characterized by this.

The invention according to claim 6 is the portable communication terminal according to claim 5,
When the battery voltage detected by the battery voltage detection means exceeds the fourth predetermined value in a state in which the detection unit is detecting charging, the display means is 1 A message indicating that the wireless communication means is not controlled to be suspended is displayed.
It is characterized by this.

Furthermore, the invention of the mobile communication terminal according to claim 7 that achieves the above object is as follows:
First wireless communication means corresponding to the first wireless communication system;
An interface corresponding to a second wireless communication system and capable of detachably connecting a second wireless communication means that consumes less power than the first wireless communication means;
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the first wireless communication means and the second wireless communication means are communicating and the battery voltage detected by the battery voltage detection means is less than or equal to a fifth predetermined value, the first wireless communication means is used. Control means for controlling to a stop state,
When the battery voltage detected by the battery voltage detection means exceeds a sixth predetermined value higher than the fifth predetermined value in a state where the first wireless communication means is in a use-disabled state by the control means, the first One wireless communication unit is controlled to be usable.

Furthermore, the invention of the mobile communication terminal according to claim 8 that achieves the above object is as follows:
First wireless communication means corresponding to the first wireless communication system;
An interface that allows external devices to be detachably connected;
Determining means for determining whether or not the external device connected to the interface is a second wireless communication means compatible with the second wireless communication system and consuming less power than the first wireless communication means; ,
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the determination unit determines the connection of the second wireless communication unit, the first wireless communication unit is in communication mainly receiving and the battery voltage detected by the battery voltage detection unit is the seventh A control means for controlling the first wireless communication means to be in a use stop state when the value is equal to or less than a predetermined value;
When the battery voltage detected by the battery voltage detecting means exceeds an eighth predetermined value higher than the seventh predetermined value in a state where the first wireless communication means is in a use stop state by the control means, the first One wireless communication unit is controlled to be usable.

  In the portable communication terminal of the present invention, when the battery voltage drops to the first predetermined value or the fifth predetermined value or less while the first wireless communication means and the second wireless communication means are simultaneously communicating, The first wireless communication means that consumes a large amount of power is suspended. In addition, when the first wireless communication unit is in communication mainly receiving, and the battery voltage is equal to or lower than the third predetermined value or the seventh predetermined value, an external device including the second wireless communication unit is connected via the interface. In such a case, the first wireless communication means that consumes a large amount of power is set to a use stop state. As a result, communication by the second wireless communication means with low power consumption can be executed, so that multimode communication according to the battery voltage can be executed efficiently, and the power supply of the terminal can be prevented from being turned off unexpectedly. it can. In addition, when the first wireless communication means is in a use stop state, when the power operation unit is operated, the display means selects whether the first wireless communication means can be used or the power is turned off. When the screen is displayed or the battery voltage exceeds the sixth predetermined value higher than the fifth predetermined value or the eighth predetermined value higher than the seventh predetermined value, the first wireless communication means is automatically set in a usable state. Control. Therefore, when charging of the battery is started by stopping the first wireless communication means, the first wireless communication means can be appropriately returned without causing any unexpected situation to the user, and the convenience for the user can be improved.

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

  FIG. 1 is a functional block diagram showing a configuration of a main part of a mobile communication terminal according to an embodiment of the present invention. The mobile communication terminal 100 is a mobile phone terminal, which includes an antenna 101, a radio unit 102, a power supply unit 103 including a secondary battery, a battery voltage detection unit 104 that measures a battery voltage of the power supply unit 103, and a power supply unit 103. A charger connecting portion 115 to which a charger (not shown) such as an AC adapter for charging the battery is detachably connected, and a charger detecting portion 116 for detecting charging of the battery by the charger via the charger connecting portion 115. , An input key including a power button 105a which is a power operation unit, an operation unit 105 such as a touch panel, a display unit 106 such as an LCD (Liquid Crystal Display) or OEL (Organic Electro Luminescence), an SD for inserting an SD I / F compatible card I / F 107, external slot detection unit 108 for detecting insertion of an SD I / F compatible card into the SD I / F 107, ROM 1 for writing software, etc. 9 and RAM 110, a control unit 111 for controlling the entire operation.

  The wireless unit 102 is a first wireless communication unit (hereinafter referred to as main communication unit as appropriate) corresponding to a first wireless communication system (main system) such as cdma2000 1x or W-CDMA which is a wireless communication system provided by a communication carrier. The transmission means, the reception means, and the like are built-in, and radio waves can be transmitted and received via the antenna 101. Here, for convenience of explanation, it is assumed that the main system performs cdma2000 1x communication involving transmission and reception (hereinafter, abbreviated as 1x communication as appropriate) and communication using cdma2000 1xEV-DO. BCMCS (Broadcast / Multicast Services) is performed by receiving data by cdma2000 1xEV-DO.

  Further, the SD wireless card 200 can be inserted into and removed from the SD I / F 107 as an SD I / F compatible card. The SD wireless card 200 corresponds to the second wireless communication system (sub system), and the SD I / F 201 and second wireless communication means (hereinafter referred to as sub communication means as appropriate) for communication by the sub system. A radio unit 202 and an antenna 203, a ROM 204 and a RAM 205 for writing software and the like of the sub system, and a control unit 206 for controlling the overall operation are included.

  The SD wireless card 200 is connected to the mobile communication terminal 100 by being inserted into the SD I / F 107 of the mobile communication terminal 100, and is supplied with power from the power supply unit 103, whereby the sub system independently of the main system is used. Communication can be executed. Therefore, the main communication unit and the sub communication unit can execute communication at the same time. Here, for convenience of explanation, it is assumed that the SD wireless card 200 performs wireless LAN communication.

  In the present embodiment, the current consumption during 1x communication of the main system is, for example, 40 mA at the demodulator, 70 mA at the maximum in the modulator, and 450 mA at the maximum in the transmitter. Therefore, if the battery voltage when the power supply voltage is reduced is 3.4 V, for example, the power consumption at this time is 3.4 × (40 + 70 + 450) = 1904 (mW). On the other hand, the SD wireless card 200 of the sub wireless system is driven at, for example, 3.3V, and the current consumption during wireless LAN communication is, for example, 110 mA in the transmission mode and 50 mA in the reception mode. Therefore, if the average current is 80 mA, the power consumption is 3.3 × 80 = 264 (mW), which is less than that of 1 × communication. Further, the total current consumption of the wireless communication terminal 100 when 1x communication and wireless LAN communication are performed simultaneously is, for example, about 700 mA.

  FIG. 2 is a diagram showing an example of the discharge rate-voltage characteristics of the battery constituting the power supply unit 103 shown in FIG. Here, if the main communication means is waiting for an incoming call (when waiting), if only the sub-communication means is executing wireless LAN communication (when using a wireless LAN), only the BCMCS data reception is executed by the main communication means (When BCMCS), only 1x communication is executed by the main communication means (when 1x is used), 1x communication is executed by the main communication means, and at the same time wireless LAN communication is executed by the sub communication means (1x + wireless LAN) When in use). When the wireless LAN is used, the main communication means is waiting for an incoming call. In addition, the above “in use” indicates a state in which communication is performed.

  As is clear from FIG. 2, the battery generally has a lower voltage as the discharge rate becomes higher, and a voltage drop increases as the current increases. In addition, a mobile phone terminal normally uses a lithium-ion battery with a rating of 3.7V, and in the case of a 1x system mobile phone terminal, for example, the battery voltage cannot be communicated at around 3.4V. It is designed to automatically turn off the power of the terminal itself when it becomes 3V or less. For this reason, in the 1x system mobile phone terminal, in order to show the remaining battery level to the user, the remaining battery level is predicted from the battery voltage and displayed on the display unit with 1 to 3 lights, or the battery voltage is 3.4 V or lower. Or “Low Batt” is displayed.

  In the present embodiment, for example, a lithium-ion battery having a rating of 3.7 V is used as the battery accommodated in the power supply unit 103, and the first threshold value (Vth1), the second threshold value (Vth2), and the third value are compared with the battery voltage. A threshold value (Vth3) and a fourth threshold value (Vth4) are set, and the operation is controlled based on a comparison between these threshold values and the battery voltage detected by the battery voltage detection unit 104.

  Here, Vth1 is the first predetermined value and the fifth predetermined value of the present invention, and is a voltage at the limit of use. Vth2 is the second predetermined value, the fourth predetermined value, the sixth predetermined value, and the eighth predetermined value of the present invention, and is a voltage that is equal to or lower than Vth1 when 1x communication is performed when the wireless LAN is used or in standby. Vth3 is a voltage that is equal to or lower than Vth1 when BCMCS data is received when the wireless LAN is used or in standby. Vth4 is the third predetermined value and the seventh predetermined value of the present invention, and is a voltage that becomes Vth1 or lower when wireless LAN communication is performed during 1x communication (when 1x is used), standby, or BCMCS data reception. . Vth1, Vth2, Vth3, and Vth4 are voltages indicating the above concept. In practice, it is preferable to use a voltage (predetermined value) having a slightly higher margin than the above-described voltages. . In the present embodiment, these threshold values are stored in advance in the ROM 109 or RAM 110 as Vth1 <Vth4 <Vth3 <Vth2.

  Further, the battery voltage of the power supply unit 103 is constantly detected by the battery voltage detection unit 104 and compared with a required threshold value by the control unit 111 or detected at a predetermined cycle, and the detected battery voltage is stored in the RAM 110. In the control unit 111, the latest battery voltage stored in the RAM 110 is compared with a required threshold value.

  Next, an operation example of the mobile communication terminal 100 according to the present embodiment will be described with reference to the flowcharts shown in FIGS.

  FIG. 3 is a flowchart showing an operation example including detection of insertion of a card into the SD I / F 107. First, the external slot detection unit 108 monitors whether or not a card has been inserted into the SD I / F 107 (step S101). When the external slot detection unit 108 detects insertion of a card, the control unit 111 determines whether the card is a communication card having a wireless function (step S102). Therefore, the control unit 111 also constitutes a determination unit that determines whether the external device connected to the SD I / F 107 includes a sub communication unit corresponding to a sub system that consumes less power than the main system.

  As a result, if it is not a communication card, for example, in the case of a memory card, a sequence corresponding to the memory card is operated (step S103). On the other hand, in the case of the SD wireless card 200, the control unit 111 checks the communication state whether or not the main communication means is in 1x communication (for example, browsing) (step S104).

  Here, when the main communication means is performing 1x communication, the control unit 111 next determines whether or not the battery voltage measured by the battery voltage detection unit 104 is equal to or lower than Vth4 (step S105). As a result, when the battery voltage is equal to or lower than Vth4, the control unit 111 displays on the display unit 106 that communication by the main communication means is stopped (step S106), and thereafter an operation such as removing the SD wireless card 200. If there is no (step S107), the main communication means is suspended while the 1x communication (browsing) application is running (step S108). Thereafter, the control unit 111 waits for an operation of the application (step S109), and when there is an operation that requires communication, starts wireless LAN communication by the sub system. As a result, the browsing performed by the 1x communication of the main system is continued on the wireless LAN of the sub system (step S110).

  If the control unit 111 determines in step S104 that the main communication means is not in 1x communication (in use), the control unit 111 proceeds to step S109 to execute the application by the wireless LAN of the sub system. If the battery voltage exceeds Vth4 in S105, the process proceeds to step S109, and independent simultaneous communication between both systems is permitted. In addition, when the control unit 111 performs an operation of removing the SD wireless card 200 from the SD I / F 107 in Step S107 (Yes in Step S107), the control unit 111 continues browsing by the main communication unit.

  As described above, when the secondary communication unit is added during communication (browsing) by the main communication unit, the mobile communication terminal 100 according to the present embodiment has a main voltage when the battery voltage becomes Vth4 or less. The application that the communication means is communicating does not end, and the main communication means that consumes more power than the sub-communication means is deactivated, and the application that the main communication means is communicating with becomes the main communication means. It will be handed over to the sub-communication means with lower power consumption. Thus, by using both at the same time, it is possible to prevent the mobile communication terminal 100 from being unintentionally disabled, so that an unexpected situation is not caused to the user, and the use of the mobile communication terminal 100 is prevented. The time can be extended. For example, since the total current consumption of the wireless communication terminal 100 when 1x communication and wireless LAN communication are performed simultaneously is about 700 mA as described above, the current consumption is reduced by 70% or more when the main communication means is stopped. It becomes possible to do.

  Similarly, even when the SD wireless card 200 has been inserted and the wireless LAN is used, the mobile communication terminal 100 becomes unusable due to the start of communication of the sub-communication means by performing the processing after step S104. Can be prevented, and the same effect can be obtained.

  FIG. 4 is a flowchart showing an operation example when 1x communication by the main communication unit and wireless LAN communication by the sub communication unit are performed simultaneously. First, the control unit 111 monitors whether or not the battery voltage measured by the battery voltage detection unit 104 is equal to or lower than Vth1 (step S201). When the voltage is equal to or lower than Vth1, the main communication unit and the sub communication unit communicate with each other. The communication state is checked whether it is in the middle (step S202). Here, when the main communication means and the sub-communication means are in communication (Yes in step S202), the control unit 111 displays on the display unit 106 that the main communication means must be stopped and displays the main communication. Stop communication by means to make it out of service area. As a result, the main communication means with high power consumption notifies the user of the fact that the use is stopped (step S203).

  Thereafter, when the wireless LAN communication (for example, browsing) by the sub-communication unit is completed (step S204), the control unit 111 checks the remaining battery level by the battery voltage detection unit 104 (step S205). Here, the main communication means is stopped, and the sub-communication means is not communicating, so it is assumed to approximate the battery voltage at the time of standby. It is determined whether or not the battery voltage is Vth2 or less (step S206). As a result, if it is not less than Vth2, the control unit 111 automatically searches for the main communication means and waits for it, or allows the user to select whether or not communication of the main communication means is possible (not shown). FIG. 4 shows a case in which standby is performed by automatically searching, whereby the standby of the main communication means is resumed, and a notification to that effect is given to the user (step S207). Note that if the battery voltage is determined to be Vth2 or less in step S206, the control unit 111 does not return the main communication unit to the standby state. Further, in the above description, Vth2 is used as an approximation to the battery voltage at the time of standby. However, a new threshold value may be stored and set, and determination may be performed using the new threshold value and battery voltage. In step S202, when one of the main communication means and the sub communication means is communicating (No in step S202), a shutdown sequence of the communicating means in communication is executed (step S208).

  As a result, while the 1x communication by the main communication unit and the wireless LAN communication by the sub communication unit are simultaneously performed, the power supply unit 103 is turned off due to a decrease in the battery voltage, and both communication are abnormally terminated simultaneously. Instead, when the battery voltage drops below Vth1, browsing by the sub-communication means with low power consumption can be continued. Therefore, the function as a communication device can be utilized to the maximum and the usage time of the mobile communication terminal 100 can be extended.

  FIG. 5 shows a case where the battery voltage drops below Vth1 when the 1 × communication (voice call) by the main communication means and the wireless LAN communication (for example, browsing) by the sub communication means described in FIG. It is a flowchart which shows the operation example in the case of implement | achieving the voice call by a main communication means with a subcommunication means with little power consumption. First, the control unit 111 monitors whether or not the battery voltage measured by the battery voltage detection unit 104 is equal to or lower than Vth1 (step S301). When the voltage is equal to or lower than Vth1, the main communication unit and the sub communication unit communicate with each other. The communication state is checked whether it is in the middle (step S302).

  Here, when the main communication means and the sub-communication means are in communication (Yes in step S302), the control unit 111 refers to the address of the partner terminal that is making a voice call using the main communication means. (Step S303), it is determined whether or not VoIP communication is possible in the secondary system (Step S304). As a result, when the VoIP communication is possible at the partner terminal, the control unit 111 calls the partner by the sub system (step S305). Thereafter, when the other party responds, the control unit 111 starts VoIP communication in the sub system (step S306), and the main communication means ends the voice call and leaves the service area. As a result, the main communication means that consumes a large amount of power is suspended, and the user is notified of this fact (step S307). Note that the control unit 111 similarly executes step S307 when it is determined in step S304 that the VoIP communication cannot be performed by the sub-communication means, or when the partner does not respond to VoIP for a predetermined time in step S306.

  Thereafter, when the wireless LAN communication (VoIP or browsing) by the sub-communication means is completed (step S308), the control unit 111 checks the remaining battery level by the battery voltage detection unit 104 (step S309). Here, the main communication means is stopped, and the sub-communication means is not communicating, so it is assumed to approximate the battery voltage at the time of standby. It is determined whether or not the battery voltage is Vth2 or less (step S310). As a result, if it is not less than Vth2, the control unit 111 automatically searches for the main communication means and waits for it, or allows the user to select whether or not communication of the main communication means is possible (not shown). FIG. 5 shows a case in which standby is performed by automatically searching, as in the case of FIG. 4, whereby the standby of the main communication means is resumed and a notice to that effect is given to the user (step S311). Note that if the battery voltage is determined to be Vth2 or less in step S310, the control unit 111 does not return the main communication unit to the standby state. Further, in the above description, Vth2 is used as an approximation to the battery voltage at the time of standby. However, a new threshold value may be stored and set, and determination may be performed using the new threshold value and battery voltage. In step S302, when one of the main communication means and the sub communication means is communicating (No in step S302), a shutdown sequence of the communicating means in communication is executed (step S312).

  As a result, while the voice communication by the main communication means and the browsing by the sub-communication means are simultaneously performed, the power supply unit 103 is turned off due to a decrease in the battery voltage, and both communications are not terminated abnormally at the same time. When the battery voltage drops below Vth1, the voice communication by the main communication means can be continued by the sub communication means with low power consumption. Therefore, the function as a telephone can be utilized to the maximum.

  FIG. 6 is a flowchart showing an operation example when the battery voltage becomes Vth2 or less when wireless LAN communication (for example, browsing) is performed using the sub-communication means. First, when the battery voltage measured by the battery voltage detection unit 104 becomes Vth2 (step S401), the control unit 111 notifies the user that the standby in the main communication means is ended by the display unit 106 or the like (step S401). S402). Further, the control unit 111 terminates the power supply to the transmission unit (not shown) of the wireless unit 102, and does not return a message such as Ack to the base station even if there is an incoming call. As a state, the transmission by the main communication means is prohibited and the use is stopped (step S403).

  Thereafter, when the browsing by the sub-communication means is completed (step S404), the control unit 111 checks the remaining battery level by the battery voltage detection unit 104 (step S405). Here, the main communication means is stopped, and the sub-communication means is not communicating, so it is assumed to approximate the battery voltage at the time of standby. It is determined whether or not the battery voltage is equal to or lower than Vth2 (step S406). As a result, if it is not Vth2 or less, the control unit 111 causes the user to select whether or not to wait for the main communication means to be resumed (step S407), and automatically selects the main communication means when standby resumption is selected. The area search is performed (step S408) to return to the standby state (step S409). Note that the control unit 111 does not return the main communication unit to the standby state when it is determined in step S406 that the battery voltage is equal to or lower than Vth2 or when standby restart is not selected in step S407. If the battery voltage is determined to be Vth2 or higher, the standby of the main communication means may be automatically resumed (not shown). Further, in the above description, Vth2 is used as an approximation to the battery voltage at the time of standby. However, a new threshold value may be stored and set, and determination may be performed using the new threshold value and battery voltage.

  According to this operation example, for example, when the battery voltage drops to Vth2 or lower during browsing by the sub-communication means, the main communication means becomes in a disabled state, so that the standby main communication means is idle handoff (base station switching). It is possible to prevent the wireless communication terminal 100 from being unusable because the power supply unit 103 is turned off due to the start of a process involving transmission of an incoming call response or the like. Thereby, browsing by the sub-communication means with low power consumption can be normally terminated.

  FIG. 7 is a flowchart showing an operation example in the case where BCMCS data reception by the main communication unit and wireless LAN communication (for example, browsing) by the sub communication unit are performed simultaneously. First, during reception of BCMCS data, the external slot detection unit 108 monitors whether or not a card is inserted into the SD I / F 107 (step S501). When the external slot detection unit 108 detects insertion of a card, the control unit 111 determines whether or not the card is a communication card having a wireless function (step S502). As a result, if it is not a communication card, for example, in the case of a memory card, a sequence corresponding to the memory card is operated (step S503). On the other hand, in the case of the SD wireless card 200, the control unit 111 monitors whether or not the battery voltage measured by the battery voltage detection unit 104 is equal to or lower than Vth4 (step S504). As a result, if Vth4 or less, the control unit 111 displays on the display unit 106 that the main communication unit must be stopped (step S505), stops communication by the main communication unit, and the main communication unit. Is suspended (step S506).

  Thereafter, when the browsing by the sub-communication unit is completed (step S507), the control unit 111 checks the remaining battery level by the battery voltage detection unit 104 (step S508). Here, the main communication means is stopped, and the sub-communication means is not communicating, so it is assumed to approximate the battery voltage at the time of standby. It is determined whether or not the battery voltage is equal to or lower than Vth2 (step S509). As a result, if it is not Vth2 or less, the control unit 111 causes the user to select whether or not communication is resumed by the main communication unit (step S510), and when communication resumption is selected, the communication (standby) of the main communication unit is selected. ) Is resumed (step S511). If the battery voltage is determined to be Vth2 or less in step S509, or if the communication restart of the main communication unit is not selected in step S510, the control unit 111 keeps the main communication unit in the use stop state. To do. If the battery voltage is determined to be Vth2 or higher, the standby of the main communication means may be automatically resumed (not shown). Further, in the above description, Vth2 is used as an approximation to the battery voltage at the time of standby. However, a new threshold value may be stored and set, and determination may be performed using the new threshold value and battery voltage.

  As a result, during the simultaneous reception of BCMCS data by the main communication means and browsing by the sub-communication means, the power supply unit 103 is turned off due to a decrease in battery voltage, and both communications are terminated abnormally at the same time. However, when the battery voltage drops below Vth4, only browsing by the sub-system with low power consumption can be continued.

  As described above, for example, when the main communication unit and the sub communication unit are communicating and the battery voltage becomes Vth1 or less, the main communication unit is stopped (OFF) and the sub communication unit is set to the communication state (ON). When the main communication means is receiving BCMCS data and the battery voltage is Vth4 or less, when the SD wireless card 200 is inserted into the SD I / F 107, the main communication means is turned off and the sub-communication means is turned on. . Therefore, in such a state, the user cannot respond to an incoming call or the like by the main system. Therefore, the user charges a battery of the power supply unit 103 by connecting a charger (not shown) such as an AC adapter to the charger connection unit 115. However, it is necessary to restore the main communication means.

  Hereinafter, the return operation of the main communication means when the SD wireless card 200 is inserted and the main communication means is turned off will be described with reference to the flowchart shown in FIG. 8 and the display screen example shown in FIG.

  First, based on the output of the charger detection unit 116, the control unit 111 determines whether or not the charger is connected to the charger connection unit 115 and charging of the battery is started, that is, whether or not the battery is being charged. Is detected (step S601), and when charging is started, it is next detected whether or not the power button 105a of the operation unit 105 has been operated (step S602). As a result, when the power button 105a is not operated, the control unit 111 waits for the battery voltage detected by the battery voltage detection unit 104 to exceed a predetermined value (here, Vth2) (step S603). Power is supplied to the communication means and the main communication means is turned on (step S604).

  On the other hand, when the control unit 111 detects the operation of the power button 105a in step S602, the control unit 111 turns on the main communication unit or turns off the terminal power source on the display unit 106 as shown in FIG. Is displayed (step S605), and the user is prompted to select one (step S606). In this state, since the main communication means is OFF and only the sub-communication means is operating, in this embodiment, the display unit 106 further displays “Low Battery” as shown in FIG. “Main System OFF” is displayed, and “OFF” is displayed near the antenna mark in the pictogram area to visually notify the user that the main communication means cannot be used. Further, “Sub” is displayed in the pictogram area to visually notify the user that only the sub-communication means is operating.

  If the terminal power supply OFF is selected in step S606, the control unit 111 turns off the terminal power supply (step S607) and continues charging. On the other hand, when the main communication unit ON is selected, the control unit 111 supplies power to the main communication unit to turn on the main communication unit (step S608). A message as shown in FIG. 9B is displayed to notify the user that the main communication means is turned off when the charger is removed (step S609). Note that FIG. 9B is similar to FIG. 9A in addition to the above message because the battery voltage has not yet reached the predetermined value (Vth2) even when the main communication means is turned on. In addition, it is displayed that the main communication means cannot be used and only the sub communication means is operating.

  Thereafter, the control unit 111 detects that the battery voltage detected by the battery voltage detection unit 104 exceeds a predetermined value (Vth2) (step S610), and displays the message on the display unit 106 as shown in FIG. ), And notifies the user that the main communication means can be used even if the charger is disconnected (step S611). In FIG. 9C, the main communication means is turned on by displaying the reception state near the antenna mark in the pictogram area and deleting the display of “Sub” and “Low Battery Main System OFF”. It shows that it is ready to use.

  As described above, in the present embodiment, when a sub communication unit that consumes less power than the main communication unit is added, priority is given to the communication by the sub communication unit according to the battery voltage. Abnormal termination of the main communication means and the sub-communication means due to a decrease in battery voltage can be prevented, and as a result, the standby time of the mobile communication terminal 100 can be extended. Also, when charging starts when the sub-communication means is ON and the main communication means is OFF because the battery voltage is low, if the power button 105a is not operated, the main communication means is immediately turned on. Instead, after the battery voltage has recovered to a voltage at which both the main communication means and the sub-communication means can maintain communication, the main communication means is automatically turned ON. Therefore, it is possible to reliably respond to incoming calls in the main system, etc., and after the main communication means is automatically turned on, even if the user unplugs the charger for some reason, communication is performed by both communication means. Can be done.

  When the power button 105a is pressed after the start of charging, a selection screen as shown in FIG. 9A is displayed on the display unit 106, and the main communication means is turned on or the terminal power is turned off. Let the user select Further, when the main communication means ON is selected, a message as shown in FIG. 9B is displayed on the display unit 106 until the battery voltage exceeds a predetermined value (Vth2), and the charger is disconnected. When the battery voltage exceeds a predetermined value (Vth2), a message as shown in FIG. 9C is displayed on the display unit 106, and communication is possible even if the charger is disconnected. To be notified. Therefore, it is possible to prevent the charger from being unexpectedly disconnected and the main communication means from being stopped again. Thereby, the main communication means can be appropriately restored without causing any unexpected situation to the user, and the convenience for the user can be improved.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, the communication system by the main communication means is not limited to a system that receives cdma2000 1x or BCMCS data, but can be other wireless communication systems, and the sub system by the sub communication means is not limited to a wireless LAN, Any communication system different from the system can be used. Further, the number of sub-communication means is not limited to one, and the present invention can be applied effectively when a plurality of sub-communication means with different communication systems can be connected. Further, the external device is not limited to the SD card, and may be a device connected by USB. Further, in the return operation of the main communication means shown in FIG. 8, it is similar to the user by using a voice or a vibration function instead of or together with the screen display of FIGS. 9 (a) to 9 (c). Can also be notified.

It is a functional block diagram which shows the structure of the principal part of the mobile communication terminal which concerns on one embodiment of this invention. It is a figure which shows an example of the discharge rate-voltage characteristic of the battery which comprises the power supply part shown in FIG. 6 is a flowchart showing an operation example including detection of insertion of a card into the SD I / F of the mobile communication terminal shown in FIG. 3 is a flowchart showing an operation example of the mobile communication terminal shown in FIG. 1 when 1x communication by a main communication unit and wireless LAN communication by a sub communication unit are performed simultaneously. In FIG. 4, it is a flowchart which shows the operation example in case communication of a main communication means is implement | achieved by a subcommunication means. 3 is a flowchart illustrating an operation example of the mobile communication terminal shown in FIG. 1 when the remaining battery level becomes Vth2 or less during browsing by the sub-communication means. 3 is a flowchart showing an operation example of the mobile communication terminal shown in FIG. 1 when BCMCS data reception by a main communication unit and wireless LAN communication by a sub communication unit are performed simultaneously. It is a flowchart explaining the return operation example of the main communication means of the portable communication terminal shown in FIG. It is a figure which shows the example of a screen display accompanying the return operation | movement of the main communication means shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Mobile communication terminal 101 Antenna 102 Radio | wireless part 103 Power supply part 104 Battery voltage detection part 105 Operation part 105a Power button 106 Display part 107 SD I / F
108 External slot detector 109 ROM
110 RAM
111 Control Unit 115 Charger Connection Unit 116 Charger Detection Unit 200 SD Wireless Card 201 SD I / F
202 Radio section 203 Antenna 204 ROM
205 RAM
206 Control unit

Claims (8)

First wireless communication means corresponding to the first wireless communication system;
An interface corresponding to a second wireless communication system and capable of detachably connecting a second wireless communication means that consumes less power than the first wireless communication means;
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the first wireless communication means and the second wireless communication means are communicating and the battery voltage detected by the battery voltage detection means is equal to or lower than a first predetermined value, the first wireless communication means is used. Control means for controlling to a stop state;
A power control unit for turning the power on and off;
When the power operation unit is operated in a state where the first wireless communication unit is disabled by the control unit, whether the first wireless communication unit is enabled or the power is turned off. Display means for displaying a screen to be selected;
A mobile communication terminal characterized by comprising: A detection unit for detecting whether or not the battery is being charged;
When it is selected that the first wireless communication unit is enabled, the control unit controls the first wireless communication unit to the enabled state,
When the battery voltage detected by the battery voltage detection means is equal to or lower than a second predetermined value higher than the first predetermined value in a state where the detection unit detects charging, the display means Is displayed to indicate that the first wireless communication means is controlled to be disabled when
The mobile communication terminal according to claim 1. When the battery voltage detected by the battery voltage detection means exceeds the second predetermined value in a state in which the detection unit is detecting charging, the display means is 1 A message indicating that the wireless communication means is not controlled to be suspended is displayed.
The mobile communication terminal according to claim 2. First wireless communication means corresponding to the first wireless communication system;
An interface that allows external devices to be detachably connected;
Determining means for determining whether or not the external device connected to the interface is a second wireless communication means compatible with the second wireless communication system and consuming less power than the first wireless communication means; ,
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the determination unit determines the connection of the second wireless communication unit, the first wireless communication unit is in communication mainly receiving, and the battery voltage detected by the battery voltage detection unit is third. A control means for controlling the first wireless communication means to be in a use stop state when a predetermined value or less;
A power control unit for turning the power on and off;
When the power operation unit is operated in a state where the first wireless communication unit is disabled by the control unit, whether the first wireless communication unit is enabled or the power is turned off. Display means for displaying a screen to be selected;
A mobile communication terminal characterized by comprising: A detection unit for detecting whether or not the battery is being charged;
When it is selected that the first wireless communication unit is enabled, the control unit controls the first wireless communication unit to the enabled state,
When the battery voltage detected by the battery voltage detection means is lower than a fourth predetermined value higher than the third predetermined value in a state where the detection unit detects that charging is in progress, the display means Is displayed to indicate that the first wireless communication means is controlled to be disabled when
The mobile communication terminal according to claim 4. When the battery voltage detected by the battery voltage detection means exceeds the fourth predetermined value in a state in which the detection unit is detecting charging, the display means is 1 A message indicating that the wireless communication means is not controlled to be suspended is displayed.
The mobile communication terminal according to claim 5. First wireless communication means corresponding to the first wireless communication system;
An interface corresponding to a second wireless communication system and capable of detachably connecting a second wireless communication means that consumes less power than the first wireless communication means;
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the first wireless communication means and the second wireless communication means are communicating and the battery voltage detected by the battery voltage detection means is less than or equal to a fifth predetermined value, the first wireless communication means is used. Control means for controlling to a stop state,
When the battery voltage detected by the battery voltage detection means exceeds a sixth predetermined value higher than the fifth predetermined value in a state where the first wireless communication means is in a use-disabled state by the control means, the first A mobile communication terminal, wherein one wireless communication means is controlled to be usable. First wireless communication means corresponding to the first wireless communication system;
An interface that allows external devices to be detachably connected;
Determining means for determining whether or not the external device connected to the interface is a second wireless communication means compatible with the second wireless communication system and consuming less power than the first wireless communication means; ,
Battery voltage detection means for detecting the battery voltage of the power supply unit including the battery;
When the determination unit determines the connection of the second wireless communication unit, the first wireless communication unit is in communication mainly receiving and the battery voltage detected by the battery voltage detection unit is the seventh A control means for controlling the first wireless communication means to be in a use stop state when the value is equal to or less than a predetermined value;
When the battery voltage detected by the battery voltage detecting means exceeds an eighth predetermined value higher than the seventh predetermined value in a state where the first wireless communication means is in a use stop state by the control means, the first A mobile communication terminal, wherein one wireless communication means is controlled to be usable.

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