JP2012178663A - Portable terminal device and radio communication method - Google Patents

Abstract

A portable terminal device and a wireless communication method for specifying a reason for disconnecting wireless communication with another portable terminal device are provided.
When a disconnection detecting unit 163 detects disconnection of communication while a smartphone 100 and a tablet terminal 150 are wirelessly connected, the determination unit 164 determines whether the remaining battery level is based on the remaining battery level of the smartphone 100 immediately before disconnection. It is determined whether the communication is cut off due to the drop or the communication distance is cut off due to an unknown communication partner. The notification unit 165 notifies the user of the determined reason for disconnecting communication.
[Selection] Figure 3

Description

  The present invention relates to a mobile terminal device that is directly connected to another mobile terminal device and a wireless communication method between a plurality of mobile terminal devices.

  In recent years, portable terminals such as smartphones and portable game machines, and information terminals such as personal computers have become widespread, and techniques for establishing wireless connection between these terminals and transmitting and receiving data have been established. As such wireless communication standards, there are standards such as Bluetooth (registered trademark) and Wi-Fi (Wireless Fidelity) (registered trademark).

  By using such a wireless communication standard, not only data transmission / reception is performed between terminals, but also the usability of the user can be improved by checking the operating state of the other terminal at one terminal. As such a technique, for example, a technique disclosed in Patent Document 1 is known.

  In Patent Document 1, a mobile phone and a personal computer are connected via Bluetooth, and the received electric field strength of the mobile phone, the remaining amount of battery, the remaining usage time, and the like are transferred from the mobile phone to the personal computer. A technique for displaying is disclosed. As a result, the user can check the operating state of the mobile phone simply by looking at the display of the personal computer without looking at the display on the mobile phone, thereby saving the trouble of taking the mobile phone out of the bag or pocket. it can.

JP 2006-311606 A

  In the technology disclosed in Patent Document 1 described above, assuming that the mobile terminals are all wirelessly connected and the communication between the connected mobile terminals is disconnected, the user views the display. However, there is a problem that it is impossible to specify the reason for the disconnection.

  An object of the present invention is to provide a portable terminal device and a wireless communication method for specifying a reason for disconnecting wireless communication with another portable terminal device.

  The mobile terminal device of the present invention detects a disconnection of the wireless communication between the receiving means for receiving the remaining battery level information of the other mobile terminal device from the other mobile terminal device in wireless communication and the other mobile terminal device When disconnection of wireless communication between the disconnection detecting means and the other mobile terminal device is detected, the reason for disconnection of the wireless communication is determined based on the remaining battery information of the other mobile terminal device. A determination unit that determines whether the communication is disconnected due to a decrease in the remaining battery level of the terminal device or a communication disconnection due to the fact that the other mobile terminal device is unknown, and the determined wireless communication disconnect reason to the user And a notification means for notifying.

  When the wireless communication method of the present invention receives battery remaining amount information of the other mobile terminal device from another mobile terminal device that is performing wireless communication, and the wireless communication with the other mobile terminal device is disconnected, Based on the remaining battery level information of another mobile terminal device, the reason for disconnecting the wireless communication is communication disconnection due to a decrease in the remaining battery level of the other mobile terminal device, or the other mobile terminal device is unknown It is determined whether or not the communication is disconnected, and the user is notified of the determined reason for disconnecting the wireless communication.

  According to the present invention, it is possible to specify the reason for disconnecting wireless communication with another mobile terminal device.

The block diagram which shows the structure of the smart phone which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the tablet terminal which concerns on Embodiment 1 of this invention. The block diagram which shows the function structure of the tablet terminal which concerns on Embodiment 1 of this invention. 1 is a sequence diagram illustrating a communication procedure when communication between the smartphone illustrated in FIG. 1 and the tablet terminal illustrated in FIG. 2 is separated from each other and communication is disconnected due to an unknown communication partner. The sequence diagram which shows the communication procedure in case communication is cut | disconnected by the battery remaining low of a smart phone, while the smart phone shown in FIG. 1 and the tablet terminal shown in FIG. 2 are wirelessly connected. The sequence diagram which shows the communication procedure in case communication is cut | disconnected by the battery remaining low of a smart phone, while the smart phone shown in FIG. 1 and the tablet terminal shown in FIG. 2 are wirelessly connected. Diagram for explaining how to notify the remaining battery level Diagram for explaining how to notify the user of the reason for disconnection Diagram for explaining other methods for notifying the user of the reason for disconnection Diagram for explaining other methods for notifying the user of the reason for disconnection The block diagram which shows the function structure of the tablet terminal which concerns on Embodiment 2 of this invention. Sequence diagram showing a communication procedure when the distance between the smartphone and the tablet terminal according to Embodiment 2 of the present invention is wirelessly connected and communication is disconnected due to unknown communication partner The sequence diagram which shows the communication procedure in case communication is cut | disconnected by the battery remaining low while the smart phone and tablet terminal which concern on Embodiment 2 of this invention are wirelessly connected. Conceptual diagram showing how the reconnection interval is lengthened in steps Conceptual diagram showing how the reconnection interval is shortened step by step

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

(Embodiment 1)
In the first embodiment of the present invention, a mobile phone called a smart phone that combines a voice call function with a PDA (Personal Data Assistance) and a touch panel type mobile terminal called a tablet terminal are wirelessly connected directly, and the tablet terminal controls the smart phone. A case will be described as an example.

  FIG. 1 is a block diagram showing a configuration of smartphone 100 according to Embodiment 1 of the present invention. In this figure, a CPU (Central Processing Unit) 101 acquires data from a storage unit 103, a WiFi communication unit 106, and a BT (Bluetooth) communication unit 107 connected via an internal bus 102, and uses the acquired data. Various arithmetic processes are performed to control the smartphone 100.

  The storage unit 103 stores various data, and the stored data is read to the CPU 101, the WiFi communication unit 106, and the BT communication unit 107 via the internal bus 102.

  The power supply unit 104 supplies power for driving the smartphone. Specifically, it is a chargeable / dischargeable rechargeable battery or an external power source. The power control unit 105 controls the power supply of the power unit 104.

  The WiFi communication unit 106 transmits / receives data to / from other communication devices by WiFi communication, and the BT communication unit 107 transmits / receives data to / from other communication devices by BT communication.

  FIG. 2 is a block diagram showing a configuration of tablet terminal 150 according to Embodiment 1 of the present invention. In this figure, the CPU 151 acquires data from the storage unit 153, the WiFi communication unit 155, and the BT communication unit 156 connected via the internal bus 152, performs various arithmetic processes using the acquired data, and performs tablet operations. 150 is controlled.

  The storage unit 153 stores various data, and the stored data is read to the CPU 151, the WiFi communication unit 155, and the BT communication unit 156 via the internal bus 152.

  The display unit 154 displays image data such as an icon and an indicator indicating the state of the tablet terminal.

  The WiFi communication unit 155 transmits and receives data to and from other communication devices by WiFi communication, and the BT communication unit 156 transmits and receives data to and from other communication devices by BT communication.

  FIG. 3 is a block diagram showing a functional configuration of the tablet terminal 150 shown in FIG. In this figure, the receiving unit 161 receives the remaining battery level information of the smartphone 100 transmitted from the smartphone 100, and outputs the received remaining battery level information to the storage unit 162 and the notification unit 165. In addition, the reception unit 161 outputs the data signal transmitted from the smartphone 100 to the disconnection detection unit 163.

  The memory | storage part 162 memorize | stores the battery remaining charge information of the smart phone 100 output from the receiving part 161, and is read by the determination part 164 as needed.

  The disconnection detection unit 163 monitors the data signal output from the reception unit 161 and detects whether the wireless communication with the smartphone 100 has been disconnected. When disconnection of wireless communication is detected, the disconnection detection unit 163 notifies the determination unit 164 to that effect.

  When the determination unit 164 acquires the wireless communication disconnection detection notification from the disconnection detection unit 163, the determination unit 164 reads out the remaining battery level information of the smartphone 100 from the storage unit 162, and performs threshold determination between the read remaining battery level and a predetermined threshold value. When the remaining battery level is greater than or equal to the threshold value, the determination unit 164 may determine whether the distance from the smartphone 100 is more than a certain distance or the wireless signal emitted from the smartphone 100 is disturbed, even though the remaining battery level is sufficient. First, it is determined that a state in which radio waves cannot be received (for example, the received electric field strength is less than a predetermined value) is that communication has been disconnected due to unknown communication partner. On the other hand, when the remaining battery level is less than the threshold value, the determination unit 164 determines that communication has been disconnected due to a decrease in the remaining battery level of the smartphone 100. The determination result, that is, the reason for disconnecting communication is output to the notification unit 165.

  The notification unit 165 notifies the user of the remaining battery level information of the smartphone 100 output from the reception unit 161. In addition, the notification unit 165 notifies the user of the reason for disconnecting communication output from the determination unit 164. Details of this notification method will be described later.

  Next, the communication procedure when the smartphone 100 shown in FIG. 1 and the tablet terminal 150 shown in FIG. Will be described.

  4, in step (hereinafter abbreviated as “ST”) 201, the smartphone 100 detects the remaining battery level, and in ST202, the detected battery level is notified to the tablet terminal 150.

  In ST203, the notification unit 165 of the tablet terminal 150 notifies the user of the remaining battery level notified from the smartphone 100. ST201 to ST203 are performed each time the smartphone 100 detects a change in the remaining battery level, or are performed at regular intervals.

  In ST204, the disconnection detection unit 163 of the tablet terminal 150 detects disconnection of communication with the smartphone 100. In ST205, the determination unit 164 of the tablet terminal 150 receives the remaining battery level of the smartphone 100 and the predetermined threshold value received before disconnection of communication. The threshold is determined. Here, assuming that the remaining battery level of the smartphone 100 is equal to or greater than the threshold, the distance between the smartphone 100 and the tablet terminal 150 is increased, and it is determined that the communication is disconnected due to unknown communication partner.

  In ST206, the notification unit 165 of the tablet terminal 150 notifies the user that the communication partner is unknown.

  Next, a communication procedure when communication is disconnected due to a low battery level of the smartphone 100 while the smartphone 100 illustrated in FIG. 1 and the tablet terminal 150 illustrated in FIG. 2 are wirelessly connected will be described with reference to FIG. To do. 5 that are in common with FIG. 4 are assigned the same reference numerals as in FIG.

  5, in ST301, the determination unit 164 of the tablet terminal 150 performs threshold determination between the remaining battery level of the smartphone 100 received before disconnection of communication and a predetermined threshold. Here, assuming that the remaining battery level of the smartphone 100 is less than the threshold, it is determined that the communication is disconnected due to a decrease in the remaining battery level of the smartphone 100.

  In ST302, the notification unit 165 of the tablet terminal 150 notifies the user that the remaining battery level of the smartphone 100 has decreased.

  Next, a communication procedure when communication is disconnected due to a decrease in the remaining battery level of the smartphone 100 while the smartphone 100 illustrated in FIG. 1 and the tablet terminal 150 illustrated in FIG. 2 are wirelessly connected will be described with reference to FIG. To do.

  6, in ST401, the smartphone 100 detects LVA, and in ST402, the detected LVA is notified to the tablet terminal 150.

  In ST403, the notification unit 165 of the tablet terminal 150 notifies the user of the LVA notified from the smartphone 100.

  In ST404, the disconnection detection unit 163 of the tablet terminal 150 detects disconnection of communication with the smartphone 100. In ST405, since the notification of LVA is received in ST403, the determination unit 164 indicates that the remaining battery level of the smartphone 100 has decreased. It is determined that the communication has been disconnected.

  In ST406, the notification unit 165 of the tablet terminal 150 notifies the user that the remaining battery level of the smartphone 100 has decreased.

  Here, as a battery remaining amount notification method, 1- (1) a method of notifying the current battery remaining amount, the maximum value of the remaining battery amount and the battery state (see FIG. 7A), 1- (2) current For notifying the remaining battery level in percent (%) (see FIG. 7B), 1- (3) Notifying the current remaining battery level with an index (see FIGS. 7C and 7D) Can be considered.

  1- (1) In the method of notifying the current remaining battery level, the maximum value of the remaining battery level and the battery state, as shown in FIG. The battery level is notified at the battery level, the maximum battery level is notified at the battery level, and the battery status is notified as 0 if normal, 1 if LVA is occurring, and 2 if charging.

  1- (2) In the method of notifying the current remaining battery level as a percentage (%), the remaining battery level is reported as a percentage from 0 to 100 as shown in FIG.

  1- (3) In the method of notifying the current battery remaining amount with an index, as shown in FIG. 7C, the battery remaining amount is notified with 0 to the maximum number of indexes. For example, as shown in FIG. 7D, this index is assigned to the indexes 0 to 9 with the remaining battery level and the battery state, and is shared between the smartphone 100 and the tablet terminal 150.

  Next, a method for determining the reason for disconnecting communication in the determination unit 164 of the tablet terminal 150 will be described. As this determination method, 2- (1) a method of calculating from a transition of time, 2- (2) a method of using LVA, and 2- (3) a method of using communication accumulated time can be considered.

  2- (1) The method of calculating from the transition of time is to estimate the voltage drop from the remaining battery level, the remaining battery time received from the smartphone 100 immediately before the tablet terminal 150 detects the disconnection of communication, and the current time. If a certain time corresponding to the remaining battery level has elapsed from the battery remaining time, it is determined that the communication has been disconnected due to a decrease in the remaining battery level. If not, it is determined that the communication is disconnected due to unknown communication partner.

  Note that the tablet terminal 150 does not determine the remaining battery level only from the last remaining battery level received from the smartphone 100 immediately before the detection of the disconnection of communication, but two or more times received from the smartphone 100 before the detection of the disconnection of communication. The reason for disconnecting communication may be determined based on the remaining battery level. Thereby, the progress of the remaining battery level can be calculated from the remaining battery level information received two or more times, and the determination can be made more accurately.

  Further, the tablet terminal 150 may determine the reason for disconnection of communication based on any remaining battery level, not limited to the remaining battery level received from the smartphone 100 immediately before detection of disconnection. Furthermore, it is possible to determine more accurately by calculating the progress of the remaining battery level from the remaining battery time.

  2- (2) In the method of using LVA, when the tablet terminal 150 receives LVA immediately before detection of communication disconnection, it is determined that the communication is disconnected due to low battery power, and when LVA is not received, the communication partner is unknown. It is determined that the communication has been disconnected.

  2- (3) The method of using the accumulated communication time is to estimate a decrease in voltage from the accumulated communication time from when the tablet terminal 150 starts communication with the smartphone 100 to when communication disconnection is detected, and the accumulated communication time exceeds a predetermined time. If it is less than a predetermined time, it is determined that the communication is disconnected due to unknown communication partner.

  Note that the reason for disconnection of communication may be determined by combining the above 2- (1) to 2- (3) as appropriate.

  Next, a method for notifying the user of the reason for disconnection of communication in the notification unit 165 of the tablet terminal 150 will be described. For example, as shown in FIG. 8A, in the case of communication disconnection due to unknown communication partner, the tablet terminal 150 displays an icon indicating disconnection and performs a pop-up display indicating communication partner unknown. At this time, the smartphone 100 may display an icon indicating that the remaining battery level is unknown. In communication disconnection due to a decrease in the remaining battery level, the tablet terminal 150 displays an icon indicating disconnection and performs a pop-up display indicating that the smartphone 100 is out of battery. At this time, the smartphone 100 may display an icon indicating that the remaining battery level is low.

  Further, for example, as shown in FIG. 8B, when communication is disconnected due to unknown communication partner, the tablet terminal 150 may turn off the icon indicating that communication is in progress. At this time, the smartphone 100 may turn off the icon indicating the remaining battery level. In addition, when the communication is disconnected due to a low battery level, the tablet terminal 150 may turn off the icon indicating that communication is in progress. At this time, the smartphone 100 may turn off the icon indicating the remaining battery level. Here, the description has been made assuming that the icon is turned off in both the tablet terminal 150 and the smartphone 100, but instead of turning off the light, the reason for disconnection may be notified by graying out, blinking, changing the color, or the like. In short, it is sufficient that the reason for disconnection can be notified by changing the display state.

  Also, for example, as shown in FIG. 9, a plurality of states may be displayed with one icon on the status bar. In FIG. 9A, “◯” indicates that the remaining battery level is sufficient (for example, the remaining battery level is 10% or more) and communication is being performed. In FIG. 9B, “Δ” indicates that the remaining battery level is sufficient (for example, the remaining battery level is 10% or more) and the communication partner is unknown. Further, in FIG. 9C, “x” indicates that the remaining battery level is insufficient (for example, LVA is generated). Here, ◯, Δ, and X have been described as examples. However, this is merely an example, and other icons may be displayed.

  Furthermore, for example, as shown in FIG. 10, among icons displayed on the menu screen of the tablet terminal 150, the display state of an icon for starting an application (browser in FIG. 10) on the assumption that the smartphone 100 operates. May be changed. FIG. 10A shows a case where the remaining battery level of the smartphone 100 is sufficient (for example, the remaining battery level is 10% or more) and communication is being performed. FIG. This shows a case where the remaining battery level is insufficient (for example, LVA is generated). As can be seen from these figures, when the remaining battery level of the smartphone 100 is insufficient, the display state is changed, for example, the browser activation icon is grayed out. At this time, even if the browser activation icon shown in FIG. 10B is activated, if the browser activation is prohibited, browser activation processing, access processing to the smartphone 100, and the like can be avoided. It is possible to save resources required for these processes.

  As a notification method other than the above to the user of the reason for disconnection of communication in the tablet terminal 150, notification by sound, vibration, LCD backlight, LED, or the like may be considered. When notifying by sound, it is notified by DTIM (Delivery Traffic Indication Message) tone or synthetic audio (MIDI, etc.) from the headphones or speakers, or “the communication partner is unknown” Notification may be made by voice guidance such as “the battery level of the smartphone has dropped”. In the case of notification by vibration, the reason for communication disconnection is notified by a vibration pattern by associating the reason for communication disconnection with a different vibration pattern. In the case of notification using the LCD backlight, the reason for communication disconnection is notified by the blinking pattern by associating the reason for communication disconnection with the blinking pattern of the LCD backlight. Furthermore, when notifying by LED, the reason for communication disconnection is notified by the LED emission color by associating the reason for communication disconnection with the LED emission color. Further, by associating the reason for the disconnection with the blinking pattern of the LED, the reason for the disconnection is notified by the blinking pattern.

  As described above, according to the first embodiment, when communication disconnection is detected while the smartphone and the tablet terminal are wirelessly connected, communication disconnection due to a decrease in the remaining battery level is determined based on the remaining battery level of the smartphone immediately before disconnection. Alternatively, it is possible to perform processing corresponding to the reason for disconnection by determining whether the communication is disconnected due to an unknown communication partner because the distance between them is increased.

(Embodiment 2)
The configuration of the smartphone according to the second embodiment of the present invention is the same as the configuration shown in FIG. 1 of the first embodiment, and thus detailed description thereof is omitted.

  FIG. 11 is a block diagram showing a functional configuration of the tablet terminal 170 according to Embodiment 2 of the present invention. 11 differs from FIG. 3 in that a connection interval control unit 171 and a connection processing unit 172 are added.

  The connection interval control unit 171 controls the repetition interval of the reconnection process according to the reason for disconnection of communication output from the determination unit 164 and notifies the connection processing unit 172 of the connection interval.

  The connection processing unit 172 performs reconnection processing on the smartphone at the connection interval notified from the connection interval control unit 171.

  FIG. 12 is a sequence diagram showing a communication procedure when the smartphone according to Embodiment 2 of the present invention and the tablet terminal 170 are wirelessly connected and the distance between them is increased and communication is disconnected due to unknown communication partner. is there. 12, parts common to those in FIG. 4 are denoted by the same reference numerals as those in FIG. 4, and duplicate descriptions are omitted.

  In ST501, a reconnection request is transmitted from the connection processing unit 172 of the tablet terminal 170 to the smartphone 100. In ST502, the tablet terminal 170 waits for a reconnection response from the smartphone 100 for a predetermined time (T1).

  In ST503, since a certain time (T1) has elapsed, the connection processing unit 172 of the tablet terminal 170 transmits a reconnection request to the smartphone 100 again. In ST504, the tablet terminal 170 reconnects from the smartphone 100 for a certain time (T1). Wait for connection response. The tablet terminal 170 continues the reconnection request transmission process until a reconnection response is received from the smartphone 100.

  FIG. 13 is a sequence diagram illustrating a communication procedure when communication is disconnected due to a decrease in the remaining battery power while the smartphone 100 and the tablet terminal 170 according to Embodiment 2 of the present invention are wirelessly connected. In FIG. 13, the same reference numerals as those in FIG.

  In ST601, a reconnection request is transmitted from the connection processing unit 172 of the tablet terminal 170 to the smartphone 100. In ST602, the tablet terminal 170 waits for a reconnection response from the smartphone 100 for a predetermined time (T2 (≠ T1)).

  In ST603, since a certain time (T2) has elapsed, a reconnection request is transmitted again from the connection processing unit 172 of the tablet terminal 170 to the smartphone 100. In ST604, the tablet terminal 170 reconnects from the smartphone 100 for a certain time (T2). Wait for connection response. The tablet terminal 170 continues the reconnection request transmission process until a reconnection response is received from the smartphone 100.

  The reconnection cycle described above has been described as a fixed time of T1 or T2, but the reconnection interval may be increased stepwise as shown in FIG. Further, the reconnection interval may be increased stepwise every two reconnections. In any of these cases, it may not be longer than a predetermined reconnection interval.

  In this way, by increasing the reconnection interval stepwise, the service can be continued under conditions where the communication partner can be found immediately, such as when returning from a weak electric field. That is, in the reconnection process of FIG. 12, it is desirable to increase the reconnection interval stepwise.

  Further, as shown in FIG. 15, the reconnection interval may be shortened step by step. Further, the reconnection interval may be shortened step by step every two reconnections. In any of these cases, it may not be shorter than a predetermined reconnection interval.

  In this way, by reducing the reconnection interval step by step, the tablet with reconnection processing under the condition that a certain waiting time is required until reconnection becomes possible by charging or the like from a state where the remaining battery level is low. The power consumption of the terminal can be suppressed. That is, in the reconnection process of FIG. 13, it is desirable to shorten the reconnection interval step by step.

  As described above, in the second embodiment, by changing the reconnection interval performed by the tablet terminal according to the reason for disconnection of communication, the time required for reconnection is shortened and the power consumption required for reconnection is suppressed. Both can be achieved.

  In this embodiment, FIG. 13 shows the case where the reconnection process is performed, but the reconnection process may not be performed. Thereby, the power consumption of a tablet terminal can be suppressed.

  In each of the above embodiments, a smartphone and a tablet terminal have been described as examples. However, the present invention is not limited thereto, and may be two or more portable terminals.

  The portable terminal device and the like according to the present invention are useful as a portable terminal device and the like that specify the reason for disconnecting wireless communication with another portable terminal device.

101, 151 CPU
102, 152 Internal bus 103, 153, 162 Storage unit 104 Power supply unit 105 Power supply control unit 106, 155 WiFi communication unit 107, 156 BT communication unit 154 Display unit 161 Reception unit 163 Disconnection detection unit 164 Judgment unit 165 Notification unit 171 Connection interval Control unit 172 Connection processing unit

Claims (7)

Receiving means for receiving the remaining battery information of the other mobile terminal device from another mobile terminal device during wireless communication;
Disconnection detecting means for detecting disconnection of wireless communication with the other portable terminal device;
When disconnection of wireless communication with the other mobile terminal device is detected, based on the remaining battery information of the other mobile terminal device, the reason for disconnecting the wireless communication is the remaining battery level of the other mobile terminal device. A determination means for determining whether the communication disconnection due to a drop or the communication disconnection due to the fact that the other mobile terminal device has become unknown;
Notification means for notifying the user of the determined reason for disconnecting the wireless communication;
A portable terminal device comprising:   The mobile terminal device according to claim 1, wherein the determination unit determines that a state in which a radio wave transmitted from the other mobile terminal device cannot be received is a disconnection of communication due to the unknown mobile terminal device.   The mobile terminal device according to claim 1, further comprising a connection processing unit that changes a reconnection interval according to a reason for disconnecting the wireless communication.   2. The mobile terminal device according to claim 1, wherein the connection processing unit shortens the reconnection interval in a stepwise manner when the reason for disconnecting the wireless communication is a communication disconnection due to a decrease in remaining battery power of the other mobile terminal device. .   2. The mobile terminal according to claim 1, wherein when the reason for disconnecting the wireless communication is a communication disconnection due to the fact that the other mobile terminal device is unknown, the connection processing unit lengthens the reconnection interval stepwise. apparatus.   2. The mobile terminal device according to claim 1, wherein the connection processing unit stops reconnection when the reason for disconnecting the wireless communication is communication disconnection due to a decrease in a remaining battery level of the other mobile terminal device. Receiving the remaining battery information of the other mobile terminal device from another mobile terminal device during wireless communication;
When wireless communication with the other mobile terminal device is disconnected, the reason for disconnecting the wireless communication is due to a decrease in the remaining battery power of the other mobile terminal device based on the remaining battery information of the other mobile terminal device. It is determined whether the communication is disconnected or communication disconnection due to the fact that the other mobile terminal device is unknown,
Informing the user of the determined reason for disconnecting the wireless communication;
Wireless communication method.

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