JP2003289569A - Mobile terminal, urgent message system and urgent message control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal having a position detecting function and an urgent message function, an urgent message system and an urgent message control method whereby a center quickly knows the position of the mobile terminal. <P>SOLUTION: The mobile terminal 1 has a position detecting function and an urgent message function for messaging a center via a base station. The terminal 1 starts watching by operating a watch start/cancel switching circuit 25. It stores positioning data measured by a GPS positioning means in a memory circuit 21. If the positioning data are not obtained, it communicates with the base station through a radio transceiver circuit 23 to obtain positioning data to be stored therein. If the positioning data vary abnormally successively in excess of an allowable number of times, the terminal sends a mobile trouble message to the center 3 via the base station from the radio transceiver circuit 23, together with all positioning logs stored in the memory circuit 21, and an urgency button is depressed to send an urgency message to the center 3 via the base station 10 from the radio transceiver circuit 23, together with all positioning logs stored in the memory circuit 21. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency call system and an emergency call control method including a mobile terminal having a position detecting function and an emergency call function, and a center for receiving an emergency call from the mobile terminal.

[0002]

2. Description of the Related Art In a mobile phone system, the current position of a mobile phone is monitored by a home location register (HLR) on the network side, and when the mobile phone receives a call, the home location register is referred to and the mobile phone is checked. The present position of the telephone is identified, and a call is made from a base station whose service area is the present position. The position information of the mobile phone in this case has accuracy according to the size of the service area of the base station, and therefore, the radius is several kilometers to several tens of kilometers at the present time. In order to improve the accuracy of this position information, a service is known in which the current position of the mobile phone is limited to a narrower range by communicating with a plurality of base stations. Also PHS
(Personal Handyphone System
In em), since the transmission output power of the base station is small, its service area is about several hundred meters or less. Therefore, the accuracy of the current position information is higher than that of a mobile phone,
A current position search service and the like utilizing this high position accuracy are known.

In addition, GPS (Global Position)
A mobile terminal such as a mobile phone equipped with a Ning System) is known, and the current position can be calculated with high accuracy by receiving radio waves from a plurality of GPS satellites. There is also known means for displaying the current position on the map by associating the detected current position with the map information (for example, JP-A-11-27736, JP-A-2).
000-354268, JP 2001-2724A.
No. 50). Therefore, by carrying the GPS-equipped mobile terminal, it becomes easy to search its current position from the center side via the network. For example, there has been proposed a service for searching the current position by having the elderly and the young people requiring care hold the present position.

A small portable device equipped with an emergency button is also known. When the emergency button is pressed, an emergency call is sent to the center side via a network, and services such as emergency dispatch are provided in response to inquiries from the center side. Doing systems are also known. The position information can be included in the emergency call information in that case. That is, the function of the emergency button,
In the event of an emergency, the center side can be notified by carrying a small-sized device including the above-mentioned current position detection function, and the center side can identify the position of the emergency notification transmission and determine whether or not to dispatch.

[0005]

A GPS-equipped mobile terminal is capable of highly accurate positioning outdoors, such as when it can receive radio waves from GPS satellites, but indoors or underground. Positioning is impossible because radio waves from GPS satellites cannot be received. In that case, if communication is possible with the base station, the position of the mobile terminal can be detected based on the number of each base station, the service area number, etc., although the accuracy is low.

[0006] Further, the mobile terminal periodically measures the position and stores it in the memory in the mobile terminal. When an emergency call is made to the center, the center side reads the position measurement data in the memory and the mobile terminal It is possible to identify the current position from the movement route of the. In that case, by shortening the positioning interval of the mobile terminal, it is possible to obtain a highly accurate moving route and to easily track the mobile terminal, but it is necessary to increase the memory capacity for storing the positioning data, and Since the power consumption increases due to the constant positioning, the battery capacity for supplying the operating power must be increased, resulting in a problem of large size and weight. On the other hand, if the positioning interval is lengthened, it is possible to suppress an increase in power consumption, but there is a problem that the accuracy of the moving route is lowered.

Further, the positioning data stored in the memory is GPS
If it is not distinguished whether it was obtained by receiving radio waves from a satellite or obtained based on base station information, the accuracy of the positioning data will differ, and the reliability of the movement route will fluctuate. Therefore, there is a problem that it is difficult to quickly search the current position of the mobile terminal.

An object of the present invention is to make it possible to accurately and promptly perform position search of a mobile terminal without increasing the power consumption of the mobile terminal.

[0009]

An emergency call system according to the present invention will be described with reference to FIGS. 1 and 2. In a mobile terminal 1 having a position detection function and an emergency call function, a base station 10 is provided. A wireless transmission / reception circuit 23 for performing wireless transmission / reception between
A GPS receiving circuit 27 and a computing unit 26 as a position detecting function that receives radio waves from the GPS satellites 6 and obtains positioning data.
And GPS positioning means, an emergency button input circuit 24 for detecting the pressing of an emergency button, a memory circuit 21, a warning start / cancel switching circuit 25 for switching between warning start and cancellation of the warning, and each unit are controlled. And a processor 20 for
The processor 20 sends an emergency notification from the wireless transmission / reception circuit 23 to the center 3 via the base station 10 in response to the notification of the pressing of the emergency button from the emergency button input circuit 24, and the alert by the alert start / cancel switching circuit 25. When the positioning data by the GPS positioning means or the positioning data cannot be obtained by the start, the positioning data obtained by the position detection function by the communication with the base station 10 via the wireless transmission / reception circuit 23 is stored in the memory circuit 21. In addition, when the abnormality of the change in the positioning data exceeds the allowable number of times in succession, the center 3 is provided with a movement abnormality notification via the wireless transmission / reception circuit 23.

Further, the processor 20 compares the previous positioning data with the current positioning data and a preset positioning timer C which determines the cycle for obtaining the positioning data when the warning start / cancellation switching circuit 25 starts the warning, and sets it in advance. When it is within the range (error range), the current positioning data is stored in the memory circuit 21.
Positioning log counter A that accumulates in and counts up
And a repositioning counter B that calculates the positioning data again and counts up the number of consecutive times when the value is not within the range, and the processor 20 determines that the count value of the repositioning counter B is the allowable number (maximum). When the number of repositioning allowed) is exceeded, the wireless transceiver circuit 23 causes the base station 10 to
The center 3 is configured to send all the positioning logs including the latest positioning log stored in the memory circuit 21 and the movement abnormality notification via the center 3, and the processor 20 uses the warning start / cancel switching circuit 25 for warning. Emergency button input circuit 2 after start
In response to the notification of the pressing of the emergency button from 4, the wireless transmission / reception circuit 23 sends the information to the memory circuit 2 to the center 3 via the base station 10.
It has a configuration for sending an emergency notification including all the positioning logs accumulated in 1.

Further, the emergency call system of the present invention includes the mobile terminal 1 to the base station 10 including the position detecting function and the emergency call function.
In the emergency notification system for making a notification to the center 3 via the mobile terminal 1, the mobile terminal 1 obtains the positioning data by the GPS positioning means as the position detecting function or the positioning data by the warning start by the warning start / cancel switching circuit 25. When not
The memory circuit 21 stores the positioning data by communication with the base station 10 via the wireless transmission / reception circuit 23 as a position detection function.
When the abnormality in the change of the positioning data (when the error range is exceeded) is continuously detected over the allowable number of times (maximum repositioning allowable number), all of the latest positioning data stored in the memory circuit 21 are stored. Sending a movement abnormality report together with the positioning log from the wireless transmission / reception circuit 23 to the center 3 via the base station 10,
When the emergency button is pressed, a configuration is provided in which an emergency notification together with all positioning logs including the latest measurement data accumulated in the memory circuit 21 is sent from the wireless transmission / reception circuit 23 to the center 3 via the base station 10. A mobile abnormality notification is received from the terminal 1 so that the current position of the mobile terminal can be grasped and tracked, and the emergency notification can be received to determine whether to move out according to the current position.

The emergency call control method of the present invention also includes a mobile terminal 1 to a base station 10 including a position detection function and an emergency call function.
An emergency call control method of making a call to the center 3 via the alert, wherein when the alert start / cancel switching circuit 25 of the mobile terminal 1 is switched to the alert start, positioning data by a GPS positioning means having a position detection function or at predetermined time intervals When the positioning data cannot be obtained, the positioning data obtained by the communication with the base station 10 is obtained and stored in the memory circuit 21, and the difference between the previous positioning data and the present positioning data is set to a predetermined value. The process of counting the number of times exceeding the range and sending a movement abnormality report including all the positioning logs accumulated in the memory circuit 21 to the center 3 when the count value of the consecutive times exceeds the allowable value, and pressing the emergency button The process of sending an emergency notification including all positioning logs accumulated in the memory circuit 21 to the center 3 according to the above.

Further, the positioning data by the GPS positioning means having the position detecting function is preferentially stored in the memory circuit 21, and when the difference between the previous positioning data and the current positioning data exceeds a predetermined range, the current positioning data When the positioning data is obtained by communication with the base station and the positioning data obtained by performing the positioning again is obtained by the GPS positioning means, a process of accumulating the positioning data by the GPS positioning means in the memory circuit 21 is performed. It includes.

[0014]

FIG. 1 is an explanatory diagram of an emergency call system according to an embodiment of the present invention, in which 1 is a mobile phone equipped with a GPS or a mobile terminal capable of making an emergency call equipped with a GPS, and 2 is a mobile communication network. 3 is the center, 4 is the terminal of the service subscriber,
5 is an Internet service provider, 6 is a GPS satellite,
Reference numeral 10 is a base station, 11 to 13 and 17 are routers, 14 is a local area network (LAN), 15 is a data processing control unit, and 16 is a database.

The mobile terminal 1 has a position detecting function and an emergency call function. The position detecting function receives GPS radio waves from GPS satellites 6 to obtain a current position, and a GPS positioning means.
It includes a positioning unit that performs position detection based on a base station number or the like by communication with the base station 10. Further, the emergency call function is provided with an emergency button, and when the emergency button is pressed, an emergency call is sent to the center 3. Further, it is equipped with a function of accumulating positioning data by a position detection function when warning is started. Further, the mobile communication network 2 shows a case where the base station 10 and a router 11 for connecting to the center 3 side are included. In the mobile communication network 2, a plurality of base stations 10 (not shown) are distributed and arranged. There is.

Further, the center 3 includes a data processing control unit 15 and a database 16, and the data processing control unit 15 corresponds to a function of a control console including a processor, a display, an input / output unit such as a keyboard and a printer, and the like. Also GIS (Ge
graphical Information Sy
The system also has a function of a geographic information system (system), and can display a map of the current position and send out the map data based on the position information collected by the position search. The database 16 stores identification information (ID) and password for the contracted mobile terminal 1 as well as mobile terminal management data such as whether or not the user is on alert.

Further, the case where the center 3 can be accessed from the terminal 4 of the service subscriber via the Internet service provider 5 is shown. When the user joins the emergency call system, the identification information (ID) and password are entered. do it,
The position search request of the mobile terminal 1 is made possible.

The mobile terminal 1 has the configuration shown in FIG.
20 is a processor (CPU), 21 is a memory circuit, 22
Is a clock circuit, 23 is a wireless transmission / reception circuit, 24 is an emergency button input circuit, 25 is a warning start / cancel switching circuit, 26 is a computing unit, and 27 is a GPS receiving circuit. Although it is possible to add a transmission / reception circuit for providing a function as a mobile phone and a display circuit for performing various displays, the illustration is omitted.

Further, the processor 20 is capable of controlling each part and executing communication with the center 3 by controlling the wireless transmission / reception circuit 23. Also, counters A and B and timer C
Although the case where the functions of and are also included is shown, dedicated counters A and B and a timer C can be provided. The GPS receiving circuit 27 includes an antenna for receiving radio waves from the GSP satellites 6, receives radio waves from at least three GPS satellites 6, calculates the current position by the calculation unit 26, and uses it as positioning data. is there. In addition, communication is performed with the base station 10 of the mobile communication network 2, and the current position is obtained by the processing already known under the control of the processor 20 and used as positioning data.

When the warning start / cancel switching circuit 25 is switched to the warning start, the positioning data by the arithmetic unit 26 or the positioning data based on the base station by the processor 20 is stored in the memory circuit 21. At that time, the memory circuit 2 including the time information by the clock circuit 22 and the discrimination information of the positioning data by GPS or the positioning data by communication with the base station.
Store in 1. Note that the positioning data by GPS is preferentially stored in the memory circuit 21, and when the positioning data by GPS cannot be obtained, the positioning data by the base station is stored. Further, the emergency button input circuit 24 notifies the processor 20 when an emergency button (not shown) is pressed, and the processor 20 controls the wireless transmission / reception circuit 23 to control the center 3.
To make an emergency call to.

FIG. 3 and FIG. 4 show a flowchart of the embodiment of the present invention, and the symbols in the circles indicate that the processing shifts to the same symbols. The mobile terminal 1 switches to the alert start by the alert start / cancel switching circuit 25 when there is a possibility of being injured such as robbery or kidnapping when returning home at night. Therefore, the processor 20 of the mobile terminal 1 determines whether or not the warning start mode switching is completed (A
1) When the switching is completed, for example, a regular positioning timer C (timer C of the processor 20 in FIG. 2) having a cycle of 30 seconds is started (A2). That is, when the alert starts, the mobile terminal 1 follows the cycle of the regular positioning timer C.
Positioning is performed for the latitude / mildness / direction / type of the current position of (A3). The type in this case indicates positioning by GPS or positioning by communication with a base station.

Next, the presence or absence of the positioning log is determined (A
4). That is, it is determined whether or not the previous positioning data is stored in the memory circuit 21. If it is not present, the process proceeds to step (A6). If it is present, it is determined whether the difference between the previous positioning data and the current positioning data is within a predetermined value range, that is, whether it is within an error range. A judgment is made (A7). In this case, GPS-GPS compares positioning data by GPS, base-base compares positioning data by communication with a base station, and GPS-base compares positioning data by GPS and positioning data by communication with a base station. It means that the error range can be set to a different value depending on the type of each positioning means. In addition, it is common to start walking after switching to the warning start, and therefore the positioning data changes according to the walking speed. In this case, the range of the predetermined value is set such that the change of the positioning data by the periodic positioning timer C in each cycle falls within the error range. Therefore, when the vehicle is placed in an automobile or the like, the change in the positioning data exceeds the error range.

If it is within the error range, as shown by the positioning log counter A = + 1, the positioning log counter A
(The counter A of the processor 20 in FIG. 2) is counted up (A6), and it is determined whether the counter value of the positioning log counter A exceeds the maximum number of stored logs (A6).
7). That is, it is determined whether or not the number of positioning data that can be stored in the memory circuit 21 of the mobile terminal 1 has been exceeded. If it does not exceed, the current positioning log is stored (A9). If it exceeds,
After deleting the oldest log (A8), the current positioning log is stored (A9). Such address control of the memory circuit 21 is already known, and it is also possible to use control for overwriting and storing the latest positioning data in the area of the oldest positioning data.

If it is not within the error range in step (A5), the over-error repositioning counter B = + 1 is set (A10). That is, if the difference in the positioning data between the previous time and this time is large, the positioning is performed again. Then, it is determined whether or not the count value of the error-exceeding repositioning counter B (the counter B of the processor 20 in FIG. 2) exceeds the maximum repositioning allowable number (A11). It is judged that an abnormal state in which the moving speed is high compared to
The processor 20 of the mobile terminal 1 controls the wireless transmission / reception circuit 23 to notify the center 3 of a movement abnormality (A1).
2).

In this case, the latest positioning data is stored in the memory circuit 21 and the entire positioning log is transmitted together with the movement abnormality notification. Then, it is determined whether or not the notification is completed (A13), and if the notification is not completed, the process proceeds to step (A12).
When the notification is completed and the maximum repositioning allowable number in step (A11) is not exceeded, the process proceeds to step (A14). At the center 3, due to the movement abnormality notification,
Movement tracking is started for this mobile terminal 1. Thereby, when the emergency button is pressed to send an emergency report to the center 3, the center 3 can immediately grasp the current position of the mobile terminal 1.

Further, in step (A14) (see FIG. 4), it is determined whether or not an emergency call has occurred, that is, whether the emergency button input circuit 24 of the mobile terminal 1 has input a message to the processor 20 by pressing the emergency button. To do. If an emergency call has not occurred, it is judged whether or not the switching to the alarm release mode is completed (A15), and if the alarm start / cancel circuit 25 switches the alarm release, for example, it indicates a safe return to home. Clear the positioning timer C and stop it (A1
6) Clear the positioning log accumulated in the memory circuit 21 (A17), clear the positioning counter A (A18), clear the error repositioning counter B (A19), and move to step (A1).

In step (A14), when an emergency call is generated by pressing the emergency button, the processor 20 controls the wireless transmission / reception circuit 23 to make an emergency call to the center 3 (A21). In this case, the emergency information and all the positioning logs including the latest positioning data stored in the memory circuit 21 are sent out, and it is determined whether the notification is completed (A22). If not, the process proceeds to step (A21). When the process is completed and completed, the process proceeds to step (A15).

Further, in step (A15), if the switching to the warning release mode has not been completed, the regular positioning timer C
It is determined whether or not it has expired (A20), and if it has not expired, the process moves to step (A14), and if it has expired, the process moves to step (A2) to start the regular positioning timer C. It should be noted that although it may be forgotten to switch to alert cancellation, in that case, when the positioning timer C is used or when the number of restarts exceeds a predetermined number,
If the emergency button is not pressed, for example, it can be determined that the user has returned home normally, and the processor 20 can control the warning start / cancel circuit 25 to switch to the warning cancel. Alternatively, it is also possible to set home position information as a home position, and by the control of the processor 20, automatically switch to alert cancellation when the positioning data indicates the positioning data of the home position.

Further, the above-mentioned error range, the maximum allowable number of repositioning, etc. can be set in advance for each mobile terminal, or can be controlled from the center side to the mobile terminal. Further, the center side instructs the mobile terminal to send out the positioning log accumulated in the memory circuit 21 during the alert start,
It is also possible for the center side to receive the positioning log and examine the movement route of the mobile terminal 1.

[0030]

As described above, according to the present invention, when the warning start / cancel switching circuit 25 of the mobile terminal 1 is switched to the warning start, the positioning by the GPS positioning means including the GPS receiving circuit 27 and the arithmetic unit 26 is performed. Positioning is performed in a short cycle by the regular positioning timer C or the like, and the positioning data is stored in the memory circuit 21.
For example, the time information from the clock circuit 22 is stored together with the time information. Further, when radio waves from GPS satellites cannot be received indoors or underground, positioning data of the current position is obtained by communication with the base station 10 and stored in the memory circuit 21.
When the data is stored in the memory circuit 21, the positioning data is also stored including the type of positioning means for which the positioning data was obtained. Therefore, since the positioning is not always performed and the positioning data is not stored in the memory circuit, the power consumption can be reduced, and the time from the start of warning to the cancellation is, for example, a walking time of one hour or less on the return route. Since the case is general, there is an advantage that a small memory capacity is required.

When an emergency situation such as robbery, kidnapping, or traffic accident occurs after the warning is started and the emergency button is pressed, an emergency call is sent to the center 3 together with all the positioning logs including the latest positioning data stored in the memory circuit 21. Since it is transmitted to the center 3, the center 3 side can grasp the movement route and the current position of the mobile terminal 1, and can promptly take measures against an emergency dispatch or the like.

Further, by comparing the previous positioning data with the current positioning data, when the predetermined range (error range) is exceeded, positioning is performed again, and when the number of repeated consecutive times exceeds the maximum repositioning allowable number, The mobile terminal 1 corresponds to the case where the mobile terminal 1 is faster than the walking speed or the bicycle speed, and corresponds to the case where the mobile terminal 1 is moved by an automobile or the like. 3, the positioning log including the latest positioning data is read from the memory circuit 21 and sent to the center 3. Therefore, the center 3 has an advantage that the mobile terminal 1 can be tracked by receiving the movement abnormality notification, and can quickly grasp the position of the mobile terminal 1 when receiving the emergency notification.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an emergency call system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a mobile terminal according to the embodiment of this invention.

FIG. 3 is a flowchart of an embodiment of the present invention.

FIG. 4 is a flowchart of an embodiment of the present invention.

[Explanation of symbols]

1 mobile terminal 2 mobile communication networks 3 centers 4 service subscribers 5 Internet service providers 6 GPS satellites 10 base stations 11-13,17 Router 15 Data processing control unit 16 Database (DB) 20 processors (CPU) 21 Memory circuit 22 Clock circuit 23 Wireless transceiver circuit 24 Emergency button input circuit 25 Warning start / release switching circuit 26 Operation part 27 GPS receiver circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ken Yoshida             4-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa             No. 1 within Fujitsu Limited F term (reference) 5C087 AA03 BB21 BB74 DD03 DD35                       EE08 EE15 FF01 FF04 FF23                       GG18 GG29 GG66 GG70 GG83                 5K067 AA21 AA35 BB04 BB21 DD19                       DD23 EE02 EE10 FF03 GG01                       HH22 JJ52 JJ56

Claims (7)

[Claims] 1. A mobile terminal including a position detection function and an emergency call function, a radio transmission / reception circuit for performing radio transmission / reception with a base station, and a position for receiving positioning data by receiving radio waves from a GPS satellite. GPS positioning means as a detection function, an emergency button input circuit for detecting pressing of an emergency button, a memory circuit, a warning start / cancel switching circuit for switching between warning start and cancellation of the warning, and a processor for controlling each part The processor sends an emergency notification from the wireless transmission / reception circuit to the center via the base station in response to the notification of the pressing of the emergency button from the emergency button input circuit, and the processor starts the alert start / cancel switching circuit. When the positioning data by the GPS positioning means or the positioning data cannot be obtained due to the start of alerting, communication with the base station via the wireless transmission / reception circuit is performed. In addition to accumulating the positioning data in the memory circuit and sending a movement abnormality notification to the center via the wireless transmission / reception circuit when the abnormality of the change in the positioning data exceeds the allowable number of times consecutively. A mobile terminal characterized by the above. 2. The processor compares a regular positioning timer that determines a cycle for obtaining positioning data with a warning start by the warning start / cancel switching circuit with a previous positioning data and a current positioning data, and sets the positioning data in advance. A positioning log counter that accumulates the current positioning data in the memory circuit and counts up when the current position is within the range, and a repositioning counter that calculates the positioning data again and counts up for consecutive times when the current position data is not within the range. The mobile terminal according to claim 1, having a configuration including the mobile terminal. 3. The latest positioning log stored in the memory circuit from the wireless transmission / reception circuit to the center via the base station when the count value of the re-positioning counter exceeds the allowable number of times. The mobile terminal according to claim 2, wherein the mobile terminal is configured to send out all positioning logs including the above and a movement abnormality notification. 4. The processor, upon notification of pressing of an emergency button from the emergency button input circuit after the start of warning by the warning start / cancel switching circuit, from the wireless transmission / reception circuit to the center via the base station, 4. The configuration according to claim 1, further comprising a configuration for transmitting an emergency notification including all positioning logs accumulated in the memory circuit.
The mobile terminal described in the item. 5. An emergency call system for reporting from a mobile terminal including a position detection function and an emergency call function to a center via a base station, wherein the mobile terminal is activated by a warning start / cancel switching circuit to start the warning. When the positioning data by the GPS positioning means as the position detecting function or the positioning data cannot be obtained, the positioning data by the communication with the base station is stored in the memory circuit through the wireless transmission / reception circuit as the position detecting function, When the abnormality of the change in the positioning data is continuously detected over the allowable number of times, a movement abnormality notification including all the positioning logs accumulated in the memory circuit is sent from the wireless transmission / reception circuit to the center via the base station. Sending an emergency report including all positioning logs accumulated in the memory circuit by pressing the emergency button from the wireless transmission / reception circuit to the center via the base station. The center can grasp and track the current position of the mobile terminal by receiving the movement abnormality notification from the mobile terminal, and can determine whether to move out according to the current position by receiving the emergency notification. An emergency call system characterized by having a configuration for performing. 6. An emergency call control method for reporting a center from a mobile terminal including a position detection function and an emergency call function to a center via a base station, wherein an alert start / cancel switching circuit of the mobile terminal switches to alert start. When the positioning data by the GPS positioning means of the position detecting function or the positioning data is not obtained at a predetermined time interval, the positioning data obtained by communication with the base station is obtained and stored in the memory circuit. , The number of times the difference between the previous positioning data and the current positioning data exceeds a predetermined range, and when the consecutive count value exceeds the allowable value, all the positioning stored in the memory circuit is counted. A process of sending a movement abnormality notification including a log to the center, and a process of sending an emergency notification including all positioning logs accumulated in the memory circuit to the center by pressing an emergency button Emergency call control method, which comprises. 7. The positioning data by the GPS positioning means of the position detection function is preferentially stored in the memory circuit,
When the difference between the previous positioning data and this positioning data exceeds a predetermined range, this positioning data is obtained by communication with the base station, and the positioning is performed again to obtain it. 7. The emergency call control method according to claim 6, further comprising the step of accumulating the positioning data by the GPS positioning means in the memory circuit when the positioning data by the GPS positioning means.