JP2012021851A - Portable terminal and control method - Google Patents

Abstract

To provide a mobile terminal and a control method capable of appropriately determining a GPS positioning method and reducing power consumption.
A cellular phone 1 corresponds to a positioning unit 32 that acquires position information related to a current position by one positioning method selected from a plurality of positioning methods, a plurality of regions, and the plurality of positioning methods. The storage unit 70 that stores the attached specific information and the current position based on the position information acquired by the positioning unit 32 determine which of the plurality of regions is based on the specific information, and according to the determination result And a method selection unit 33 that selects a predetermined one of a plurality of positioning methods.
[Selection] Figure 2

Description

  The present invention relates to a portable terminal having a GPS positioning function and a control method.

  2. Description of the Related Art Conventionally, there has been provided a service that periodically measures location information of a mobile terminal when a security buzzer sounds or when a predetermined message is received, and notifies a registered destination. In such a service, it is desirable to promptly notify the accurate position of the mobile terminal. However, frequent GPS positioning may increase communication costs and power consumption.

  In such a situation, for example, Patent Document 1 proposes that the positioning interval be shortened when the current location measured is close to a preset dangerous location. Patent Document 2 proposes that the frequency of transmission of positioning information is increased as the degree of danger in the surrounding area is higher.

JP 2003-174396 A JP 2004-138562 A

  However, if a high-accuracy positioning method is used, the power consumption is large. Therefore, even if the positioning interval is increased by the techniques of Patent Document 1 and Patent Document 2, the current location cannot be notified due to insufficient battery power remaining in the mobile terminal. There was a fear.

  An object of the present invention is to provide a portable terminal and a control method that can appropriately determine a GPS positioning method and reduce power consumption.

  The mobile terminal according to the present invention associates an acquisition unit that acquires position information related to a current position, a plurality of regions, and the plurality of positioning methods by one positioning method selected from a plurality of positioning methods. A storage unit that stores specific information and a current position based on the position information acquired by the acquisition unit determine which of the plurality of regions is based on the specific information, and according to the determination result Control means for selecting a predetermined one of the plurality of positioning methods.

  In addition, the plurality of positioning methods include a first positioning method that requires communication with a base station and performs position calculation at its own terminal, and a second positioning method that requires communication with the base station and performs position calculation at the base station. It is preferable to include at least one of the methods and a third positioning method in which communication with the base station is unnecessary and the position calculation is performed by the own terminal.

  Moreover, it is preferable that the control means selects the third positioning method regardless of the determination result if communication with the base station is impossible.

  In addition, when the acquisition unit shifts to the third positioning method, it is preferable that the acquisition unit performs position calculation based on satellite information received in advance from a base station during positioning by the first positioning method or the second positioning method.

  Moreover, it is preferable that the said memory | storage means memorize | stores the said specific information according to a time slot | zone.

  Moreover, it is preferable that the said control means determines the space | interval which acquires the said positional information by the said acquisition means according to the said determination result.

  Moreover, it is preferable that the portable terminal according to the present invention further includes a transmission unit that transmits the position information acquired by the acquisition unit to an external device at a predetermined interval.

  The portable terminal according to the present invention further includes reception means for receiving a positioning start request, and the transmission means starts transmission of the position information in response to reception of the positioning start request by the reception means. It is preferable.

  Moreover, it is preferable that the portable terminal according to the present invention further includes an emergency input unit, and the receiving unit detects an input of the emergency input unit and receives a result of the detection as the positioning start request.

  In addition, when the input of the emergency input unit is detected by the receiving unit, the control unit preferentially selects a positioning method with high positioning accuracy among the plurality of positioning methods regardless of the determination result. Is preferred.

  Further, it is preferable that the control unit updates the specific information based on the position information acquired by the acquisition unit when an input of the emergency input unit is detected.

  Moreover, it is preferable that the control means preferentially selects a positioning method with low power consumption among the plurality of positioning methods regardless of the determination result when the remaining battery level becomes equal to or less than a predetermined threshold value.

  Moreover, it is preferable that the mobile terminal according to the present invention further includes update means for receiving data related to the plurality of regions from the base station and updating the specific information.

  According to another aspect of the present invention, there is provided a mobile terminal control method comprising: an acquisition step of acquiring position information related to a current position by one positioning method selected from a plurality of positioning methods; a plurality of regions; and the plurality of positioning methods. A storage step of storing the associated specific information, and determining which of the plurality of regions the current position based on the positional information acquired in the acquiring step corresponds to the specific information; In accordance with the result, a control step of selecting a predetermined one of the plurality of positioning methods is executed.

  According to the present invention, it is possible to appropriately determine a GPS positioning method in a mobile terminal and reduce power consumption.

1 is an external perspective view of a mobile phone according to an embodiment of the present invention. It is a block diagram which shows the function of the mobile telephone which concerns on embodiment of this invention. It is a figure which shows the positioning interval and the positioning system corresponding to the risk level which concern on embodiment of this invention. It is a flowchart which shows the movement route notification process which concerns on embodiment of this invention. It is a flowchart which shows the detail of the positioning process which concerns on embodiment of this invention. It is a flowchart which shows the detail of the positioning interval selection process which concerns on embodiment of this invention. It is a flowchart which shows the detail of the positioning system selection process which concerns on embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described. In the present embodiment, a mobile phone 1 will be described as an example of a mobile terminal.

FIG. 1 is an external perspective view of a mobile phone 1 (mobile terminal) according to the present embodiment.
The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 includes an operation unit 11 on the front surface unit 10 and a microphone 12 to which a voice uttered by a user of the mobile phone 1 during a call or when using a voice recognition application is input. The The operation unit 11 includes a function setting operation button 13 for activating various functions such as various setting functions, a telephone book function, and a mail function, and an input operation button 14 for inputting numbers of telephone numbers, mail characters, and the like. , And a determination operation button 15 for performing determination and scrolling in various operations.

  The display unit side body 3 includes a display unit 21 for displaying various types of information on the surface unit 20 and a receiver 22 for outputting the voice of the other party of the call.

  Further, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the mobile phone 1 relatively rotates the operation unit side body 2 and the display unit side body 3 which are connected via the hinge mechanism 4, so that the operation unit side body 2 and the display unit side body 3 are rotated. The body 3 can be in an open state (open state), or the operation unit side body 2 and the display unit side body 3 can be folded (folded state).

FIG. 2 is a block diagram showing functions of the mobile phone 1 according to the present embodiment.
The mobile phone 1 includes an operation unit 11, a display unit 21, a control unit 30, a communication unit 40, a main antenna 41, a GPS communication unit 50, a GPS antenna 51, a voice control unit 60, and a storage unit 70. And a security buzzer 80 (emergency input means).

  The control unit 30 controls the entire mobile phone 1, and performs predetermined control on the display unit 21, the communication unit 40, the GPS communication unit 50, the voice control unit 60, and the like, for example. In addition, the control unit 30 receives input from the operation unit 11, the communication unit 40, the security buzzer 80, and the like, and executes various processes. Then, the control unit 30 controls the storage unit 70 to read various programs and data, and write data when executing processing.

  Moreover, in this embodiment, the control part 30 transmits the positional information acquired by GPS positioning to a predetermined | prescribed destination regularly according to a positioning start request | requirement. Here, the GPS positioning method is selected according to the risk level of the area where the mobile phone 1 is located. In addition, the function of each part with which the control part 30 is provided is mentioned later.

  The communication unit 40 communicates with an external device (base station) in a predetermined frequency band (for example, 2 GHz band or 800 MHz band). Then, the communication unit 40 demodulates the signal received from the main antenna 41, supplies the processed signal to the control unit 30, modulates the signal supplied from the control unit 30, and outputs the signal from the main antenna 41. Send to external device.

  In particular, in the present embodiment, the communication unit 40 is connected to a positioning server via a base station in addition to transmission / reception of signals related to voice calls, mails, etc., satellite search auxiliary information (GPS satellite acquisition auxiliary information), Get positioning results. Although details will be described later, the positioning method executed by the control unit 30 is different and the contents of transmitted / received data are also different according to the satellite acquisition status and instruction input.

  The GPS communication unit 50 demodulates a radio signal of a predetermined frequency band from a GPS satellite received by the GPS antenna 51 and supplies the processed signal to the control unit 30. The functions of the GPS communication unit 50 and the GPS antenna 51 may be performed by the communication unit 40 and the main antenna 41, respectively.

  The sound control unit 60 performs predetermined sound processing on the signal supplied from the communication unit 40 under the control of the control unit 30, and outputs the processed signal to the receiver 22. The receiver 22 outputs the signal supplied from the audio control unit 60 to the outside. This signal may be output from a speaker (not shown) instead of the receiver 22 or together with the receiver 22.

  In addition, the voice control unit 60 processes the signal input from the microphone 12 according to the control of the control unit 30, and outputs the processed signal to the communication unit 40. The communication unit 40 performs predetermined processing on the signal supplied from the voice control unit 60 and outputs the processed signal from the main antenna 41.

  The storage unit 70 includes, for example, a working memory and is used for arithmetic processing by the control unit 30. In addition, the storage unit 70 includes a risk level map, a risk level, a positioning interval, and a positioning method as specific information that associates a plurality of regions and a plurality of positioning methods with a program that executes the processing of the present embodiment. The association data is stored. Note that the storage unit 70 may also serve as a removable external memory.

  The crime prevention buzzer 80 is a crime prevention device that calls attention to surrounding people by sounding a large volume when a user senses some danger. The control unit 30 starts notification of position information in response to the activation of the security buzzer 80. Moreover, the crime prevention buzzer 80 is an input device for notifying the control unit 30 of a signal indicating an emergency as one embodiment, and the control unit 30 that has received this signal causes the voice control unit 60 to output a warning sound. Alternatively, the communication unit 40 may notify the base station that it is urgent.

  Here, a GPS positioning method in the mobile phone 1 will be described. As an embodiment, there are an assisted positioning (second positioning method), a basic positioning (first positioning method), and a standard positioning (third positioning method) as one embodiment.

  In Assisted positioning, the mobile phone 1 receives satellite search auxiliary information (AA (Acquisition Assistance) data) from the positioning server and searches for GPS satellites. The search result is returned to the positioning server, and position calculation is performed by the positioning server. The mobile phone 1 receives the position calculation result and outputs it as a positioning result.

  Here, when the mobile phone 1 searches for satellites, if four or more satellites can be acquired, GPS-Fix mode positioning (Differential GPS positioning) that can expect the highest accuracy can be performed. On the other hand, when the signal cannot be captured, positioning is performed in the Hybrid-Fix mode using the delay time of the radio wave from the base station, the AFLT-Fix mode, and the Sector-Fix mode using the position information of the base station. Is called. The mobile phone 1 can receive a designation from a user or an application, perform positioning by designating each mode. For example, in the AFLT-Fix mode, power consumption can be reduced because information from a satellite is not acquired, but since positioning is performed in a planar space, positioning accuracy is lower than in the GPS-Fix mode. Further, since the communication with the positioning server is not possible in the out-of-network state, the positioning by the Assisted positioning cannot be performed.

  In the basic positioning, the mobile phone 1 receives satellite information (Ephemeris data and Almanac data) from the base station. The mobile phone 1 searches for satellites after creating AA data based on the received satellite information. Furthermore, unlike the assisted positioning, the mobile phone 1 performs its own position calculation without transmitting the search result to the positioning server. For this reason, the power consumption is larger than the assisted positioning in which the position calculation is performed by the positioning server. Further, in the basic positioning, it is impossible to perform positioning in a state where the mobile phone 1 cannot capture a satellite or communication with a base station is outside the network range.

  In the Standalone positioning, unlike the Basic positioning and the Assisted positioning, the mobile phone 1 does not communicate with the base station for positioning. That is, the mobile phone 1 decodes the GPS satellite signal and acquires Ephemeris data and Almanac data by itself. Therefore, the mobile phone 1 can acquire the current position by the Standalone positioning even outside the network area.

In the Based system and the Standard system, the mobile phone 1 uses the Ephemeris data, Almanac data, and the positioning result acquired in the previous positioning for the next positioning. Therefore, these methods are positioning methods effective for tracking the mobile phone 1 that is moving.
In addition, the Based method and the Standardone method have higher positioning accuracy than the Assisted method during continuous positioning, but the processing load is large because the mobile phone 1 performs position calculation.

  Thus, the positioning accuracy generally has a relationship of “Standalone method = Based method> Assisted method”, and the power consumption has a relationship of “Standalone method> Based method> Assisted method”.

Next, each part of the control unit 30 will be described in detail.
The control unit 30 includes a reception unit 31 (reception unit), a positioning unit 32 (acquisition unit), a method selection unit 33 (control unit), a transmission unit 34 (transmission unit), and an update unit 35 (update unit). Is provided.

  The accepting unit 31 accepts a positioning start request. Specifically, for example, when a predetermined instruction is input from the user via the operation unit 11, when a predetermined message (short message) is received by the communication unit 40, or when activation of the security buzzer 80 is detected These are accepted as positioning start requests.

  The positioning unit 32 acquires position information related to the current position by one positioning method selected from the plurality of positioning methods described above. Hereinafter, as a positioning method, any one of a Basic positioning, an Assisted positioning (GPS-Fix mode and AFLT-Fix mode), and a Standalone positioning is used.

  Here, when shifting to the Standalone positioning, the positioning unit 32 performs position calculation based on satellite information received from the base station in advance during Based positioning or Assisted positioning. Thereby, the time required for initial positioning is shortened. Specifically, in the case of Based positioning, the positioning unit 32 acquires satellite information (Almanac data and Ephemeris data) from the base station during processing. Therefore, when the positioning unit 32 shifts to Standalone positioning, the acquired positioning information is acquired. Use satellite information. In addition, in the case of Assisted positioning, the positioning unit 32 acquires satellite information separately from the positioning calculation result from the base station in preparation for shifting to the Standalone positioning when the radio wave environment of the satellite deteriorates.

  Based on the position information acquired by the positioning unit 32, the method selection unit 33 refers to the risk level map indicating the risk level for each of the plurality of areas, and determines the risk level of the area corresponding to the current position. Then, according to the determined risk level, a predetermined one of the plurality of positioning methods is selected.

  Here, the risk level map is a map database that is stored in advance in the storage unit 70 and is classified into levels for each area specified by latitude and longitude based on the crime occurrence rate and the like. For example, the risk level is set to three levels (high, medium, and low), and is set higher in a dark and less busy area, around the school, outside the building, and the like. Further, the risk level may change depending on the season, day of the week, time zone, and the like.

  FIG. 3 is a diagram showing positioning intervals and positioning methods corresponding to the risk level according to the present embodiment. These data are stored in the storage unit 70 and referred to by the method selection unit 33.

  If the communication with the base station is possible, that is, within the range, the method selection unit 33 selects the Basic positioning or the Assisted positioning. If the communication with the base station is impossible, that is, when the communication is out of the range, the system selection unit 33 selects the Standalone positioning. Moreover, the method selection part 33 determines the space | interval which acquires the positional information by the positioning part 32 according to the determined risk level.

  Specifically, regardless of whether it is within or outside of the service area, the method selection unit 33 shortens the positioning interval and acquires the movement route of the mobile phone 1 more accurately as the risk level is higher, and as the risk level is lower. Increase the positioning interval to reduce power consumption. For example, if the risk level is “medium” and the positioning interval is 1 minute, the positioning interval is shortened to 30 seconds when the risk level is “high”, and the positioning interval is set when the risk level is “low”. Extend to 2 minutes.

In addition, in the area, if the risk level is “high”, the method selection unit 33 selects a basic positioning method that has high positioning accuracy and is suitable for continuous positioning. Further, when the risk level is “medium”, the method selection unit 33 selects Assisted positioning (GPS-Fix mode) that consumes less power than the basic positioning as the positioning method. Furthermore, if the risk level is “low”, the method selection unit 33 selects Assisted positioning (AFLT-Fix mode) with lower power consumption as the positioning method.
On the other hand, outside the service area, the method selection unit 33 selects the Standalone positioning that does not require communication with the base station as the positioning method regardless of the risk level.

  When the activation buzzer 80 is detected by the reception unit 31, the method selection unit 33 determines a positioning method (for example, a basic positioning method) with a high positioning accuracy among a plurality of positioning methods regardless of the determined risk level. ) To give priority to selection. In addition, the method selection unit 33 selects a higher-precision positioning method when positioning has already been performed when the activation of the security buzzer 80 is detected. For example, when the position measurement is performed by the assisted positioning when the security buzzer 80 is activated, the method selection unit 33 switches to the basic positioning.

  In addition, when the security buzzer 80 is activated, the method selection unit 33 preferably updates the map information based on the position information acquired by the positioning unit 32. By using the input of the security buzzer 80 as a trigger, the risk level in the map information corresponding to the acquired position information is automatically raised, so that when the user stops at this position again, the risk level is set to a high risk level. A corresponding positioning method is selected.

  The transmission unit 34 transmits the position information acquired by the positioning unit 32 to the external device at a predetermined interval in response to receiving the positioning start request by the receiving unit 31. Specifically, for example, the moving route of the mobile phone 1 is notified to another terminal set in advance, such as a mobile terminal used by the parent of the user (child) of the mobile phone 1. The transmission unit 34 also transmits the position information to the external device even when the communication unit 40 receives a positioning start request from a specific terminal owned by a parent or the like.

  The update unit 35 receives data related to the risk level from the base station, and updates the map information. The received data is detailed information in the communication area of the base station and is maintained and managed in the latest state by the administrator. Thereby, the mobile phone 1 can update the map information to the latest and detailed contents by communicating with the base station.

  FIG. 4 is a flowchart showing a movement route notification process in the mobile phone 1 according to the present embodiment.

  In step S1, the control unit 30 determines whether or not the movement route notification function is being executed. This moving route notification function is executed in response to activation of a security buzzer, reception of a predetermined message, or the like. If this determination is YES, control unit 30 moves the process to step S2, and if the determination is NO, ends control.

  In step S <b> 2, the control unit 30 (positioning unit 32) executes a positioning process using a preset positioning method, and notifies position information that is a positioning result to a predetermined destination. Details of the process will be described later (see FIG. 5).

  In step S <b> 3, the control unit 30 (method selection unit 33) compares the positioning result in step S <b> 2 with the risk level map in the storage unit 70 and acquires the current level of risk level.

  In step S4, the control unit 30 (method selection unit 33) determines whether or not the risk level acquired in step S3 has changed since the previous positioning. When this determination is YES, control unit 30 moves the process to step S5, and when the determination is NO, the control unit 30 moves the process to step S7.

  In step S5, the control unit 30 (method selection unit 33) selects a positioning interval corresponding to the risk level acquired in step S3. Details of the processing will be described later (see FIG. 6).

  In step S6, the control unit 30 (method selection unit 33) selects a positioning method according to the risk level acquired in step S3. Details of the process will be described later (see FIG. 7).

  In step S7, the control unit 30 sets a timer for the positioning interval selected in step S5.

  In step S8, the control unit 30 stands by until the positioning interval timer set in step S7 expires. Then, when the positioning interval timer expires, the control unit 30 returns the process to step S1 and continues the movement route notification process.

  FIG. 5 is a flowchart showing details of the positioning process in the mobile phone 1 according to the present embodiment. This process corresponds to step S2 of the movement route notification process (FIG. 4).

  In step S <b> 11, the control unit 30 (positioning unit 32) uses the communication unit 40 to acquire in-range / out-of-range information indicating whether or not the mobile phone 1 is communicable with the base station. The out-of-range / out-of-service information is, for example, information on the radio wave intensity acquired through communication with the base station.

  In step S12, the control unit 30 (positioning unit 32) determines whether the mobile phone 1 is within the communication network of the base station based on the information acquired in step S11. If this determination is YES, the control unit 30 moves the process to step S13, and if the determination is NO, the control unit 30 moves the process to step S14.

  In step S13, the control unit 30 (positioning unit 32) performs GPS positioning with the positioning method set in the positioning method selection process (FIG. 7) or with the initial positioning method (for example, based positioning) at the first execution. Execute.

  In step S <b> 14, the control unit 30 (positioning unit 32) performs GSP positioning by using Standalone positioning that does not require communication with the base station.

  FIG. 6 is a flowchart showing details of the positioning interval selection processing in the mobile phone 1 according to the present embodiment. This process corresponds to step S5 of the movement route notification process (FIG. 4).

  In step S21, the control unit 30 (method selection unit 33) branches the process according to the risk level of the area where the mobile phone 1 is located. That is, if the risk level is “high”, the process proceeds to step S22. If the risk level is “medium”, the process proceeds to step S23. If the risk level is “low”, the process proceeds to step S24. Move to.

  In step S22, the control unit 30 (method selection unit 33) sets the positioning interval timer to T1 having a short period.

  In step S23, the control unit 30 (method selection unit 33) sets the positioning interval timer to T2 having a medium period (standard).

  In step S24, the control unit 30 (method selection unit 33) sets the positioning interval timer to T3 having a long period.

  FIG. 7 is a flowchart showing details of the positioning method selection process in the mobile phone 1 according to the present embodiment. This process corresponds to step S6 of the movement route notification process (FIG. 4).

  In step S31, the control unit 30 (method selection unit 33) branches the process in accordance with the risk level of the area where the mobile phone 1 is located. That is, if the risk level is “high”, the process proceeds to step S32. If the risk level is “medium”, the process proceeds to step S33. If the risk level is “low”, the process proceeds to step S34. Move to.

  In step S32, the control unit 30 (method selection unit 33) sets the positioning method to Based positioning.

  In step S33, the control unit 30 (method selection unit 33) sets the positioning method to Assisted positioning (GPS-Fix mode).

  In step S34, the control unit 30 (method selection unit 33) sets the positioning method to Assisted positioning (AFLT-Fix mode).

As described above, according to the present embodiment, the mobile phone 1 compares the current location measured with the risk level map, and selects an appropriate method from a plurality of positioning methods according to the acquired risk level. To do. Therefore, the mobile phone 1 selects a high-accuracy positioning method when the risk level is high and requires high-accuracy positioning, and conversely, when the risk level is low and the positioning accuracy can be suppressed, positioning with a low processing load is performed. The power consumption can be reduced by selecting a method.
Furthermore, when the mobile phone 1 can set different risk levels according to the season, day of the week, time zone, etc. in the risk level map, the accuracy of the acquired risk level is improved, and the positioning method is more appropriately determined. And positioning interval can be selected.

  Further, when the mobile phone 1 moves out of the communication network, the mobile phone 1 performs the stand-alone positioning. At this time, satellite information (Ephemeris data, etc.) necessary for the mobile phone 1 is acquired in advance from the base station. Therefore, the mobile phone 1 can shorten the time required for the initial positioning in an area outside the area where the risk level is particularly high, and can improve convenience.

  In addition, the cellular phone 1 sets the positioning execution interval longer as the risk level is lower, in accordance with the risk level of the current location that has been measured. Therefore, the mobile phone 1 selects a short positioning interval when a high-risk and high-accuracy travel route is required, and conversely selects a long positioning interval when the risk is low and the travel route accuracy can be suppressed. Select and reduce power consumption.

In addition, since the mobile phone 1 transmits the position information measured at the set positioning interval to another terminal as a movement route, the receiver can move the mobile phone 1 and the user's movement route from the other terminal. Can know in a timely manner.
Furthermore, since the cellular phone 1 starts to transmit location information in response to a predetermined operation input, a positioning start request such as activation of a security buzzer 80 or reception of a message, a mobile route notification service is provided only at a necessary timing. It can be provided and convenience is improved.

Further, when the security buzzer 80 is activated, the mobile phone 1 determines that the degree of risk is high, and gives priority to a high-accuracy positioning method regardless of the risk level determined by the risk level map. select. Therefore, since the mobile phone 1 changes the risk level higher with priority given to the actual situation of the user, it is possible to suppress the positioning accuracy from being unnecessarily lowered.
Furthermore, since the mobile phone 1 updates the map information based on the changed risk level at this time, the accuracy of the map information can be improved.

  In addition, the mobile phone 1 receives detailed data on the risk level in the communication area from the base station, and updates the map information. Since this data is maintained and managed by the administrator in the latest state, the mobile phone 1 can update the map information to the latest and detailed contents by communicating with the base station, improving the accuracy of the risk level to be acquired. it can.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

In the above-described embodiment, the method selection unit 33 selects the positioning method and the positioning interval according to the acquired risk level, but may further select according to the remaining battery level. That is, since the mobile phone 1 may not be able to continue a high-precision positioning method with a large processing load selected in an area where the risk level is high if the remaining battery level is equal to or less than a predetermined threshold, the method selection unit 33 Priority is given to positioning methods that consume less power.
Accordingly, the cellular phone 1 can extend the time during which the process can be continued in an area where the risk level requiring notification of the travel route is as high as possible.

  The risk level map may be editable by the user of the mobile phone 1. Thus, the mobile phone 1 can further improve the balance between safety and power consumption according to the user's wishes.

  In the above-described embodiment, the risk level map, which is a map database, is stored as a part of the specific information in which a plurality of regions and a plurality of positioning methods are associated. However, the present invention is not limited to this. For example, it may be a database in which an address and a risk level are associated with each other. In this case, the method selection unit 33 acquires the risk level based on the address converted from the positioning result.

  In addition, the wireless terminal device according to the present invention is not limited to the mobile phone 1, and various other devices such as PHS (registered trademark; Personal Handyphone System), PDA (Personal Digital Assistant), game machines, navigation devices, personal computers, etc. It can be applied to any terminal.

1 Mobile phone (mobile terminal)
DESCRIPTION OF SYMBOLS 11 Operation part 21 Display part 30 Control part 31 Reception part (reception means)
32 Positioning unit (acquisition means)
33 Method selection unit (control means)
34 Transmitter (Transmission means)
35 Update section (update means)
40 Communication Unit 41 Main Antenna 50 GPS Communication Unit 51 GPS Antenna 60 Voice Control Unit 70 Storage Unit (Storage Unit)
80 Crime prevention buzzer (emergency input means)

Claims (14)

An acquisition means for acquiring position information relating to the current position by one positioning method selected from a plurality of positioning methods;
Storage means for storing specific information in which a plurality of regions and the plurality of positioning methods are associated with each other;
The current position based on the position information acquired by the acquisition unit determines which of the plurality of regions corresponds to the specific information, and according to the determination result, among the plurality of positioning methods And a control means for selecting a predetermined one positioning method.   The plurality of positioning methods include a first positioning method that requires communication with a base station and performs position calculation at its own terminal, and a second positioning method that requires communication with the base station and performs position calculation at the base station. The mobile terminal according to claim 1, further comprising a third positioning method in which communication with at least one of the base station and the base station is unnecessary and position calculation is performed by the own terminal.   The portable terminal according to claim 2, wherein the control means selects the third positioning method regardless of the determination result if communication with the base station is impossible.   The acquisition unit performs position calculation based on satellite information received in advance from a base station at the time of positioning by the first positioning method or the second positioning method when shifting to the third positioning method. 3. The mobile terminal according to 3.   The portable terminal according to any one of claims 1 to 4, wherein the storage unit stores the specific information according to a time zone.   The portable terminal according to any one of claims 1 to 5, wherein the control unit determines an interval at which the position information is acquired by the acquisition unit according to the determination result.   The portable terminal according to any one of claims 1 to 6, further comprising a transmission unit configured to transmit the position information acquired by the acquisition unit to an external device at a predetermined interval. A receiving means for receiving a positioning start request;
The mobile terminal according to claim 7, wherein the transmission unit starts transmission of the position information in response to receiving the positioning start request by the reception unit. An emergency input means,
The portable terminal according to claim 8, wherein the reception unit detects an input of the emergency input unit and receives a result of the detection as the positioning start request.   10. The control unit preferentially selects a positioning method with high positioning accuracy among the plurality of positioning methods, regardless of the determination result, when the input of the emergency input unit is detected by the receiving unit. The portable terminal as described in.   The mobile terminal according to claim 9 or 10, wherein the control unit updates the specific information based on the position information acquired by the acquisition unit when an input of the emergency input unit is detected. .   The control means preferentially selects a positioning method with low power consumption among the plurality of positioning methods regardless of the determination result when the remaining battery level is equal to or less than a predetermined threshold value. The mobile terminal according to any one of the above.   The mobile terminal according to any one of claims 1 to 12, further comprising update means for receiving data related to the plurality of areas from a base station and updating the specific information. An acquisition step of acquiring position information related to the current position by one positioning method selected from a plurality of positioning methods;
A storage step of storing specific information in which a plurality of regions and the plurality of positioning methods are associated;
It is determined whether the current position based on the position information acquired in the acquisition step corresponds to the plurality of regions based on the specific information, and according to the determination result, among the plurality of positioning methods A control step of selecting a predetermined positioning method;

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