JP2012029341A - Mobile communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication terminal capable of executing multimode communication depending on a battery voltage with efficiency, and in the case that battery charge is started due to stop of main communication means, restoring the main communication means appropriately without bringing an unexpected occurrence to the user, and improving user's convenience.SOLUTION: When a communication operation system of a terminal 100 by first wireless communication means 102 is started up again after the communication operation system stops due to voltage drop of a battery, a start-up sequence of second wireless communication means 202 is executed to start up the communication operation system of the terminal 100 in the case that second wireless communication means 202 is connected. When a power supply operation part 111 is operated in that state, a selection screen for selecting whether the first wireless communication means 102 is made be in an available state or the power supply is turned off is displayed on display means 106. Alternatively, when a battery voltage exceeds a predetermined value Vth1, the first wireless communication means 102 is controlled to be in an available state.

Description

  The present invention relates to a mobile communication terminal.

  Conventionally, as a mobile communication system, PDC (Personal Digital Cellular), W-CDMA (Wideband Code Division Multiple Access), cdma2000 1x, PHS (Personal Handy-phone System), wireless LAN (WLAN: Wireless Local Area Network), Bluetooth Various wireless communication systems such as (registered trademark) are 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, WLANs represented by IEEE (Institute of Electrical and Electronic Engineers) 802.11b, which are widely used, have hot spots arranged in coffee shops and public facilities, and can perform communication of up to 11 Mbps. . However, since this WLAN is assumed to be used indoors, the cell area is as small as about 10 m in radius.

  By the way, since the mobile communication terminal is normally driven by a battery, for example, in a mobile phone terminal, if the battery is exhausted during use, the power is turned off and communication (communication) becomes impossible. In this case, functions other than telephone (communication) can be used, but the mobile phone terminal is turned off, so functions such as the phone book cannot be used, and urgent contact is required. It becomes impossible to know the telephone number of the contact.

  In order to solve such problems, for example, functions such as the phone book can be used until the end, the functions are gradually limited according to the remaining battery level, and there is room for the remaining battery level. There are those that turn off the power, or those that can use the phone book using a sub-display that consumes less power than the main display after the power is turned off (see, for example, Patent Document 1). Proposed.

JP 2004-128574 A

  However, as described in the above prior art, even if it is possible to refer to the built-in phone book in a state where communication is impossible, there is no communication means such as a public telephone around and it is impossible to make an emergency contact. It is expected that there will be a drop in convenience. Even if there is a public telephone nearby, data transmission is impossible.

  In particular, in recent years, coffee shops, fast food stores, public facilities, etc., where hot spots are installed tend to increase, and public telephones, etc. tend to decrease accordingly.

  On the other hand, recently, multi-mode portable communication terminals that can use different wireless communication systems have been studied. As such a multi-mode mobile communication terminal, a wireless communication means (hereinafter also referred to as main communication means) of a main wireless communication system (hereinafter also referred to as main system as appropriate) is built-in and subordinate. Wireless communication means (hereinafter, also referred to as sub-communication means, as appropriate) of a wireless communication system (for example, WLAN, Bluetooth (registered trademark), etc .: hereinafter also referred to as a sub-system) is an SD card (Secure Digital card) insertion. In addition, a configuration of adding via an interface by USB (Universal Serial Bus) connection or the like is conceivable.

  In such a configuration, the power consumption of the added sub-communication means is generally less than the power consumption of the built-in main communication means. In addition, since each communication means is used in an independent system, the main communication means and the sub-communication means are selected at the same time to execute different communication, or either one is selected to execute a desired communication. Is possible. For this reason, in particular, when the battery voltage is low, communication by the sub-communication means was possible, but communication by the main communication means was performed. May turn off unexpectedly, and both may not be able to communicate.

  In this way, when only the communication by the sub-communication means is performed, if the power of the mobile communication terminal itself is unexpectedly turned off regardless of the user operation, the battery is connected to the terminal by connecting the charger. If it is attempted to continue communication while charging the battery, it is conceivable to perform communication by supplying power only to the sub-communication means instead of the main communication means. 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 switch of the main communication means is shared with the power switch of the terminal, it cannot be determined whether it is desired to turn off the power of the terminal itself or to turn on the main communication means.

  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 a portable communication terminal according to claim 1 that achieves the above object comprises: first wireless communication means corresponding to the first wireless communication system; and an interface capable of detachably connecting an external device, using a battery as a power source. In mobile communication terminals that launch communication operation systems,
Determining means for determining whether or not the external device connected to the interface includes a second wireless communication means corresponding to a second wireless communication system;
When the communication operation system is stopped due to the voltage drop of the battery and then the communication operation system is restarted, if it is determined that the determination unit includes the second wireless communication unit, the first wireless communication unit Control means for controlling to start up the communication operation system by executing the startup sequence of the second wireless communication means without executing the startup sequence of the communication means;
A power control unit for turning the power on and off;
In a state where the control operation unit does not execute the startup sequence of the first wireless communication unit but executes the startup sequence of the second wireless communication unit to start up the communication operation system, When operated, display means for displaying a screen for selecting whether to execute the startup sequence of the first wireless communication means or to turn off the power;
It is characterized by having.

The invention according to claim 2 is the portable communication terminal according to claim 1,
Battery voltage detection means for detecting the battery voltage of the battery;
A detection unit for detecting whether or not the battery is being charged,
When it is selected to execute the startup sequence of the first wireless communication means, the control means executes the startup sequence of the first wireless communication means,
If the battery voltage detected by the battery voltage detection means is equal to or lower than a first predetermined value in a state in which the detection unit detects that the battery is being charged, the display means A message indicating that the wireless communication means is controlled to be suspended.
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 first 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 portable communication terminal according to claim 4 that achieves the above object comprises: a first wireless communication unit corresponding to the first wireless communication system; and an interface capable of detachably connecting an external device; In a mobile communication terminal that launches a communication operation system as a power source,
Battery voltage detection means for detecting the battery voltage of the battery;
Determining means for determining whether or not the external device connected to the interface includes a second wireless communication means corresponding to a second wireless communication system;
When the communication operation system is stopped due to the voltage drop of the battery and then the communication operation system is restarted, if it is determined that the determination unit includes the second wireless communication unit, the first wireless communication unit Control means for controlling to start up the communication operation system by executing the startup sequence of the second wireless communication means without executing the startup sequence of the communication means,
The battery voltage detection means in a state where the communication operation system is started by executing the startup sequence of the second wireless communication means without executing the startup sequence of the first wireless communication means by the control means. When the battery voltage detected in (1) exceeds a second predetermined value, control is performed so as to execute a startup sequence of the first wireless communication means.

  When the mobile communication terminal of the present invention is connected to an external device having the second wireless communication means at the interface when the communication operation system is restarted after the communication operation system is stopped due to a battery voltage drop. Does not execute the startup sequence of the first wireless communication means, but starts the communication operation system by executing the startup sequence of the second wireless communication means. As a result, even if the first wireless communication means cannot communicate due to the battery voltage drop, the second wireless communication means can perform communication, so multimode communication according to the battery voltage can be performed efficiently. It becomes possible to deal with emergency contacts promptly. 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 a predetermined value, the first wireless communication means is automatically controlled to be usable. 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. Thus, convenience for the user can be improved.

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. It is a figure which shows an example of the discharge rate-voltage characteristic of the battery after power-on again. 3 is a flowchart showing an overall schematic operation when power is turned on again in the mobile communication terminal shown in FIG. 1. It is a flowchart which shows the schematic operation | movement by the power ON sequence shown in FIG. 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 FIG.

  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. , The operation unit 105 such as an input key or a touch panel, the display unit 106 such as an LCD (Liquid Crystal Display) or OEL (Organic Electro Luminescence), the SD I / F 107 for inserting an SD I / F compatible card, and the SD I / F 107 External slot detector 108 that detects the insertion of an SD I / F card, ROM 109 and RAM 110 for writing software, etc., power on the terminal Power switch 111 is a power control unit that turns on), having a control unit 112 for controlling the entire operation. Note that the power switch 111 may be provided in the operation unit 105.

  The wireless unit 102 is a first wireless communication unit (hereinafter, referred to as a main system as appropriate) corresponding to a first wireless communication system such as cdma2000 1x or W-CDMA, which is a wireless communication system such as cellular provided by a communication carrier. Hereinafter, the main communication unit is appropriately configured, and a transmission unit, a reception unit, and the like are incorporated, and radio waves can be transmitted and received through the antenna 101. Here, for convenience of explanation, it is assumed that the main system performs cdma2000 1x communication involving transmission and reception (hereinafter, appropriately abbreviated as 1x system).

  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 a second wireless communication system (hereinafter referred to as a secondary system as appropriate), and performs communication by the SD I / F 201 and the secondary system, so that the second wireless communication means (hereinafter referred to as a secondary communication as appropriate). A radio unit 202 and an antenna 203, a ROM 204 and a RAM 205 for writing subsystem software, and a control unit 206 for controlling the overall operation.

  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 connected to the power source under the control of the control unit 112 when the power switch 111 is on. Power is supplied from the unit 103, and communication by the sub system can be executed. Further, the sub-communication means of the SD wireless card 200 can communicate with a voltage lower than that of the main communication means of the mobile communication terminal 100, and its power consumption is designed to be less than the power consumption of the main communication means. Here, for convenience of explanation, it is assumed that the SD wireless card 200 performs WLAN communication.

  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. 1, and shows a case where the main communication means is used. As shown in FIG. 2, the voltage of the battery generally decreases as the discharge rate increases, and the voltage drop increases as the current increases. In addition, a lithium-ion battery with a rating of 3.7V is normally used for the mobile phone terminal. In the case of a 1x system mobile phone terminal, for example, the battery voltage is around 3.4V, and communication including standby is possible. It is designed to automatically turn off the terminal when it becomes 3.3V 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 106 with 1 to 3 lights, or the battery voltage is 3.4V. In the following cases, “Low Batt” is displayed. Here, Vth1 shown in FIG. 2 is a first threshold value, which is the lowest voltage at which the main communication means can maintain communication, and is a first predetermined value and a second predetermined value.

  In this embodiment, when the main communication means is used, the power is turned off when the battery voltage detected by the battery voltage detection unit 104 reaches the first threshold (Vth1). The battery voltage that is present causes a voltage drop due to the use of the main communication means. For this reason, after the power is turned off, the voltage drop due to the main communication means disappears, so that the battery voltage is recovered from the position marked with ◯ (Vth1) shown in FIG.

  As described above, when the power supply is turned off due to the battery voltage drop and the operation (system) of the terminal stops, when the user turns on the power switch 111 and turns on the power again without charging the battery. Since the power supply is supplied to the main communication means and a voltage drop occurs, the battery voltage again becomes the first threshold value (Vth1) or less. For this reason, the power of the terminal is turned off and the system is stopped. However, if the power is not supplied to the main communication means, it is possible to turn on the power again. For example, if power is supplied to a sub-communication unit that consumes less power than the main communication unit, the battery voltage is maintained at a voltage exceeding the first threshold (Vth1), so that communication can be performed in the sub-system. Become.

  Therefore, in the present embodiment, when the battery voltage drops below the first threshold (Vth1) and the power is turned off and then the power is turned on again, the sub communication means is inserted. The power-up sequence is changed to supply power to the secondary system without supplying power to the main system, and start up the communication operation system of the terminal.

  FIG. 3 shows an example of the discharge rate-voltage characteristics of the battery after the power is turned on again in this case. After the power is turned on again, power is not supplied to the main communication means, and power is supplied only to the sub-communication means. At △ mark. However, the voltage at the Δ mark position is higher than the first threshold (Vth1) at which the terminal is turned off because the power consumption of the sub-communication means is lower than the power consumption of the main communication means and the voltage drop is also lower. Therefore, if the battery voltage for turning off the terminal is kept at the first threshold value (Vth1), the sub-communication means is a short time (a time corresponding to the increase δ1 in the discharge rate in FIG. 3). It is possible to communicate using.

  Here, the first threshold (Vth1) for turning off the power of the terminal is set to a voltage at which the main communication unit can maintain communication, in this case, 3.4 V, based on the main communication unit. However, in this case, after the power is turned on again, the main communication means is not used, and the sub-communication means operable at a voltage lower than that of the main communication means is used. Therefore, after the power is turned on again, the first threshold (Vth1) Thus, it is not necessary to turn off the power of the terminal, and the threshold for turning off the power can be changed. For example, when the operable voltage of the sub-communication means is 2.7 V, the higher one of the operating voltage and the operating voltage of the baseband IC can be set as the second threshold (Vth2).

  Therefore, in the present embodiment, the second threshold value (Vth2) is set to 3.0 V, where baseband IC operating voltage> sub-communication means communicable voltage. In this way, in FIG. 3, it is possible to perform communication using the sub-communication means for a time corresponding to an increase δ2 larger than the increase δ1. The first threshold value (Vth1) and the second threshold value (Vth2) are stored in advance in the ROM 109 or RAM 110, which is a storage unit.

  Next, the operation at the time of power-on in portable communication terminal 100 according to the present embodiment will be described with reference to the flowcharts shown in FIGS.

  FIG. 4 is a flowchart showing the overall schematic operation. In the mobile communication terminal 100 according to the present embodiment, after the shutdown, when the power switch 111 is turned on by the user and the power is turned on (step S401), the control unit 112 immediately shuts down the terminal. That is, the situation when the power is turned off is read from the shutdown information of a power supply IC (not shown) provided in the power supply unit 103, and it is detected whether or not there is an instantaneous interruption due to a decrease in battery voltage not caused by a user operation. (Step S402).

  As a result, if it is not a momentary interruption (when the user turns off the power by himself / herself in a hospital, airplane, etc.), the control unit 112 displays an initialization screen (step S403) and performs initialization (step S403). S404), the process proceeds to the power ON sequence (step S405). On the other hand, if there is a momentary interruption, the control unit 112 proceeds to the power ON sequence in step S405 through the initialization process in step S404 without displaying the initialization screen in step S403.

  FIG. 5 is a flowchart showing a schematic operation according to the power ON sequence shown in FIG. In the power ON sequence, first, the control unit 112 determines the shutdown status immediately before reading in step S402 (step S501), and if it is not a momentary interruption, supplies power to the main communication unit and performs the normal operation. The terminal is started up (step S502).

  On the other hand, when there is a momentary interruption, the control unit 112 detects the battery voltage of the power supply unit 103 by the battery voltage detection unit 104 (step S503), and the battery voltage subtracts the voltage drop due to the main communication means. It is then determined whether or not the first threshold value (Vth1) is exceeded (step S504). As a result, when it exceeds the first threshold value (Vth1), it is assumed that the battery has been charged or being charged. Therefore, in step S502, the control unit 112 supplies power to the main communication means to Set up a communication operation system. On the other hand, in the case of the first threshold value (Vth1) or less, the threshold value for turning off the terminal is changed from the first threshold value (Vth1) to the second threshold value (Vth2) (step S505), and the battery voltage is changed. It is determined whether or not exceeds Vth2 (step S506).

  Note that the battery voltage of the power supply unit 103 by the battery voltage detection unit 104 may be detected at all times and compared with a required threshold value in the control unit 112, or may be detected at a predetermined period, and the detected battery voltage may be detected. The updated battery voltage stored in the RAM 110 may be compared with the required threshold value in the control unit 112 by storing the RAM 110 while being updated.

  In step S506, when the battery voltage is less than or equal to the second threshold (Vth2) after subtracting the voltage drop due to the sub-communication means, communication by the sub-communication means cannot be performed, so the control unit 112 shuts down the terminal according to the shutdown sequence. (Step S507). On the other hand, when the battery voltage exceeds the second threshold (Vth2) by subtracting the voltage drop due to the sub-communication means, the control unit 112 notifies the user that the sub-communication means can be used. (Step S508) The insertion (connection) of the SD I / F compatible card to the SD I / F 107 is detected by the external slot detection unit 108 for a fixed time (TimeOut), and the SD I inserted into the SD I / F 107 is detected. It is determined whether the / F compatible card is the SD wireless card 200 provided with the sub-communication means (steps S509, S510, S511). Therefore, the control unit 112 also constitutes a determination unit of the SD wireless card 200 including the sub communication unit.

  Here, the SD wireless card 200 is inserted into the SD I / F 107 before the power is turned on again by the user or within a certain period of time in step S508, and the SD wireless card 200 is detected in steps S510 and S511. In this case, the control unit 112 supplies power to the sub-communication means of the SD wireless card 200 to start up the terminal communication operation system, thereby enabling communication in the sub-system. In contrast, if the SD wireless card 200 is not detected in steps S510 and S511 within a certain period, the control unit 112 proceeds to step S507 and shuts down the terminal according to the shutdown sequence of the terminal. . Note that the voltage drop value of each communication means described above is stored in a storage means such as the ROM 109 or the RAM 110. Further, the voltage drop value of the sub-communication means may be acquired and stored when used.

  As described above, when the power switch 111 is turned on and the power is turned on again after the power supply is cut off regardless of the user operation, the battery voltage is equal to or lower than the first threshold value (Vth1) and the second threshold value (Vth2). If the SD wireless card 200 is inserted in the SD I / F 107, power is supplied to the sub-communication unit and the sub-communication unit is turned on, so that the user can communicate with the sub-system. . However, in this state, since the battery voltage is not sufficient, the communication time by the sub-communication means is limited, and the main communication means is OFF, so that it cannot respond to incoming calls of the main system. For this reason, the user needs to connect a charger (not shown) such as an AC adapter to the charger connection unit 115 to charge the battery of the power supply unit 103 and return the main communication means.

  Hereinafter, with respect to the return operation of the main communication means when the main communication means is OFF and only the sub communication means is ON because the battery voltage is low, the flowchart shown in FIG. 6 and the display screen example shown in FIG. The description will be given with reference.

  First, based on the output of the charger detection unit 116, the control unit 112 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. (Step S601), and when charging is started, it is next detected whether or not the power switch 111 has been operated (step S602). As a result, when the power switch 111 is not operated, the control unit 112 waits for the battery voltage detected by the battery voltage detection unit 104 to exceed a predetermined value (here, Vth1) (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 112 detects the operation of the power switch 111 in step S602, the control unit 112 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.

  When the terminal power supply OFF is selected in step S606, the control unit 112 turns off the terminal power supply (step S607) and continues charging. On the other hand, when the main communication means ON is selected, the control unit 112 supplies power to the main communication means to turn on the main communication means (step S608). A message as shown in FIG. 7B is displayed, and the user is notified that the main communication means is turned off when the charger is removed (step S609). Note that FIG. 7B is similar to FIG. 7A in addition to the above message because the battery voltage has not yet reached the predetermined value (Vth1) 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 112 detects that the battery voltage detected by the battery voltage detection unit 104 exceeds a predetermined value (Vth1) (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. 7 (c), the main communication means is turned on by displaying the reception status in the vicinity of 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, the mobile communication terminal 100 according to the present embodiment has the sub-communication means when the communication operation system is started up again after the communication operation system of the terminal by the main communication means is stopped due to the battery voltage drop. Is connected, the secondary communication means start-up sequence is executed to start up the communication operation system of the terminal, and the second threshold of the battery voltage for stopping the communication operation system by the sub-communication means is set to the main communication. The communication operation system by means is made lower than the first threshold value of the battery voltage. As a result, even if the main communication means cannot communicate due to the battery voltage drop, the sub-communication means can communicate over a relatively long period of time, and can respond quickly to emergency communications. It becomes possible, and the multimode communication according to a battery voltage can be performed efficiently.

  In addition, when the sub-communication means is turned on and charging starts when the main communication means is turned off because the battery voltage is low, if the power switch 111 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.

  Further, when the power switch 111 is pressed after the start of charging, a selection screen as shown in FIG. 7A 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. 7B is displayed on the display unit 106 until the battery voltage exceeds a predetermined value (Vth1), and the charger is disconnected. When the battery voltage exceeds a predetermined value (Vth1), a message as shown in FIG. 7C is displayed on the display unit 106, and communication is possible even if the charger is removed. 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 using the main communication means is not limited to cdma2000 1x communication, but may be cdma2000 1xEV-DO communication or other wireless communication systems. Further, the sub-system by the sub-communication means is not limited to the WLAN, and can be any communication system different from the main system. Further, the external device is not limited to SD, but may be USB or the like. Further, in the above embodiment, in the communication by the sub-communication means, the threshold value of the battery voltage for turning off the terminal is changed to the second threshold value lower than the first threshold value by the main communication means. The threshold (Vth1) by the main communication means can be applied as it is without changing. In addition, during the power-on period, the battery voltage can be monitored to notify the user that the battery voltage is approaching the threshold value (Vth1), thereby prompting insertion of the sub-communication means. In this way, it is possible to switch to the sub-communication means without turning off the terminal.

DESCRIPTION OF SYMBOLS 100 Portable communication terminal 101 Antenna 102 Radio | wireless part 103 Power supply part 104 Battery voltage detection part 105 Operation part 106 Display part 107 SD I / F
108 External slot detector 109 ROM
110 RAM
111 Power Switch 112 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 (4)

In a mobile communication terminal including a first wireless communication unit corresponding to the first wireless communication system and an interface capable of detachably connecting an external device, and starting a communication operation system using a battery as a power source,
Determining means for determining whether or not the external device connected to the interface includes a second wireless communication means corresponding to a second wireless communication system;
When the communication operation system is stopped due to the voltage drop of the battery and then the communication operation system is restarted, if it is determined that the determination unit includes the second wireless communication unit, the first wireless communication unit Control means for controlling to start up the communication operation system by executing the startup sequence of the second wireless communication means without executing the startup sequence of the communication means;
A power control unit for turning the power on and off;
In a state where the control operation unit does not execute the startup sequence of the first wireless communication unit but executes the startup sequence of the second wireless communication unit to start up the communication operation system, When operated, display means for displaying a screen for selecting whether to execute the startup sequence of the first wireless communication means or to turn off the power;
A mobile communication terminal characterized by comprising: Battery voltage detection means for detecting the battery voltage of the battery;
A detection unit for detecting whether or not the battery is being charged,
When it is selected to execute the startup sequence of the first wireless communication means, the control means executes the startup sequence of the first wireless communication means,
If the battery voltage detected by the battery voltage detection means is equal to or lower than a first predetermined value in a state in which the detection unit detects that the battery is being charged, the display means A message indicating that the wireless communication means is controlled to be suspended.
The mobile communication terminal according to claim 1. When the battery voltage detected by the battery voltage detection means exceeds the first 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. In a mobile communication terminal including a first wireless communication unit corresponding to the first wireless communication system and an interface capable of detachably connecting an external device, and starting a communication operation system using a battery as a power source,
Battery voltage detection means for detecting the battery voltage of the battery;
Determining means for determining whether or not the external device connected to the interface includes a second wireless communication means corresponding to a second wireless communication system;
When the communication operation system is stopped due to the voltage drop of the battery and then the communication operation system is restarted, if it is determined that the determination unit includes the second wireless communication unit, the first wireless communication unit Control means for controlling to start up the communication operation system by executing the startup sequence of the second wireless communication means without executing the startup sequence of the communication means,
The battery voltage detection means in a state where the communication operation system is started by executing the startup sequence of the second wireless communication means without executing the startup sequence of the first wireless communication means by the control means. When the battery voltage detected in (1) exceeds a second predetermined value, the mobile communication terminal is controlled to execute a startup sequence of the first wireless communication means.

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