JP2005033697A - Automatic notifying system using mobile communication system, mobile terminal used therein, location specifying system of mobile terminal and location specifying method of mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic notifying system which can use an existing mobile communication system and specify the location of a mobile terminal with high accuracy. <P>SOLUTION: In an automatic notifying system using a mobile communication system, a base station network A is composed so that a single mobile terminal can receive a radio wave from a plurality of base stations 3. The notifying system is provided with mobile terminal control means 16 and 18 selecting two or more base stations 3 based on a variation for a time of an electric field strength of the radio wave received from the base stations 3, and transmitting information concerning the electric field strength of the selected base stations 3 from the terminal 1 to a location specifying means; and a location specifying means 2 obtaining a location of the terminal 1 based on the information concerning the received electric field strength and the location information of each base station 3, and outputting the information concerning the location with information indicating the occurrence of a specific state to an output destination preliminarily registered. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an automatic notification system using a mobile communication system, a mobile terminal used in the system, a mobile terminal location specifying system, and a mobile terminal location specifying method.

  There are already many automatic notification systems that use mobile communication systems to automatically notify a report destination of an abnormality of a portable terminal together with the position of the portable terminal. For example, Patent Document 1 discloses one.

  As a method for specifying the position of a mobile terminal in a mobile communication system, a base station that receives radio waves transmitted from a plurality of base stations on the mobile terminal side and has strong electric field strength (hereinafter sometimes referred to as “reception electric field strength”). A common method is to identify a location based on a station. For example, Patent Document 2 selects three base stations having a strong electric field strength from among a plurality of base stations received by a mobile terminal using a characteristic that the electric field strength attenuates in inverse proportion to the distance. A method of obtaining the position of the mobile terminal from the intersection of spheres centered on the position of each base station with a value inversely proportional to each intensity of the selected base station as a radius is disclosed.

JP 2000-11284 A JP 2002-298289 A

  In the frequency range from 800 MHz (mobile phone) to 2 GHz (PHS) used in general mobile communication systems, the radio wave has high diffraction properties, and the reflection / absorption effect varies depending on the environment around the mobile terminal. The electric field strength of the radio wave transmitted from the base station may vary greatly with the passage of time even if the electric field strength is the same location. That is, the correlation between the distance between the base station and the portable terminal and the received electric field strength is not always an ideal inverse proportion. For example, when the value when the received electric field strength that varies greatly is measured by chance, the distance to the base station that transmits the radio wave is determined to be shorter than the actual distance. Even if the above-mentioned intersection of the spheres is calculated based on the value, the position error of the intersection increases.

  Therefore, the present invention is used in a mobile terminal position specifying system, a mobile terminal position specifying method, an automatic notification system, and the system that can specify the position of the mobile terminal with high accuracy using an existing mobile communication system. An object is to provide a portable terminal.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The mobile terminal location specifying system according to the present invention is a mobile communication system in which a base station network (A) is configured so that one mobile terminal (1) can receive radio waves from a plurality of base stations (3). A terminal location system, wherein at least two base stations are selected based on time-dependent variations in electrolysis strength of radio waves received from the plurality of base stations, and the electrolysis strength of the selected at least two base stations Based on mobile terminal control means (16, 18) for transmitting information from the mobile terminal to a predetermined transmission destination, the information regarding the electrolytic strength provided as the predetermined transmission destination and the position information of each base station And the position specifying means (2) for determining the position of the portable terminal.

  According to the mobile terminal position specifying system according to the present invention, the base station used to specify the position of the mobile terminal is based on the variation with respect to time of the electric field strength received by the mobile terminal by the mobile terminal control means. Selected.

  Between the situation of fluctuation of the received electrolytic strength with respect to time and the reliability of the measured received electrolytic strength, for example, the value of the received electrolytic strength measured when the fluctuation is small or small is close to the theoretical value described above, that is, There is a correlation such as high reliability. That is, depending on the situation of fluctuation, there are cases where the reliability of the measured received electrolytic strength is high and low. According to the present invention, a base station can be selected in consideration of the correlation between the fluctuation state of the received electric field strength with respect to time and the reliability of the received electrolysis strength. Therefore, if a base station that transmits a radio wave indicating a fluctuation state that provides a more reliable received electrolysis strength is selected, the actual distance is determined when the distance between the selected base station and the mobile terminal is obtained. A highly reliable value with less error is obtained, and the position of the portable terminal can be specified with high accuracy based on the distance.

  In the present invention, the base station is selected based on the variation of the electric field strength with respect to time. The base station is selected based on only the information on the variation of the received electric field strength, and the base station is combined with other information on the information on the variation of the received electric field strength. And a mode of further narrowing down the base stations preselected by other information by information on fluctuations in received electric field strength. The information on the fluctuation of the received electric field strength includes all information obtained from the fluctuation of the received electric field strength that has a correlation with the position of the mobile terminal, and includes, for example, the magnitude of the fluctuation and the number of radio waves constituting the fluctuation. The other information may be information related to the priority order for preferentially selecting a specific base station, or information for specifying the position of the mobile terminal with higher accuracy.

  The identification of the base station may be the same as the identification function of the base station in the mobile communication system.

  The position specifying method of the portable terminal in the position specifying means is not particularly limited as long as the position of the portable terminal is obtained based on the electric field intensity transmitted from a plurality of base stations.

  The automatic notification system according to the present invention is an automatic notification using a mobile communication system in which a base station network (A) is configured so that one mobile terminal (1) can receive radio waves from a plurality of base stations (3). In the system, when a specific state occurs in the mobile terminal, at least two base stations are selected based on a change with respect to time of electric field strength of radio waves received from the plurality of base stations, and the selected Mobile terminal control means (16, 18) for transmitting information relating to the electric field strength of at least two base stations from the portable terminal to a predetermined transmission destination; and information relating to the received electric field strength provided as the predetermined transmission destination; Based on the position information of each base station, the position of the mobile terminal is obtained, and information regarding the position is stored in advance along with information indicating that the specific state has occurred. By having the position specifying means for outputting to one output destination (2) also solves the above problems.

  According to the automatic notification system of the present invention, when a specific state occurs in the mobile terminal, the base station used for specifying the position of the mobile terminal is received by the mobile terminal by the mobile terminal control means. The position of the mobile terminal can be specified with high accuracy for the same reason as the above-described mobile terminal position specifying system, which is selected based on the variation of the electric field strength with respect to time.

  “When a specific state occurs in the mobile terminal” means that a specific state is detected by the sensor, the user performs an operation to set the mobile terminal to a specific state, or the detection by the sensor and the worker This includes cases involving combinations of own operations. Note that the sensor may be built in the mobile terminal, or may be physically located away from the mobile terminal and configured to be communicable by wire or wirelessly.

  The aspect in which the base station is selected based on the variation of the electric field strength with respect to time in the present invention, the base station specifying method, and the mobile terminal location specifying method are the same as those of the mobile terminal location specifying system described above.

  The portable terminal control means may select at least two or more base stations by giving priority to those having a small variation in the electric field strength of radio waves received from the plurality of base stations.

  As a result, a base station having a small variation in received electric field strength is selected in preference to a base station having a large variation, and an electric field strength closer to the theoretical value in the correlation with respect to the distance can be obtained. High accuracy can be achieved.

  Parameters for comparing the magnitudes of variations in electric field strength are not particularly limited as long as the magnitudes of variations can be determined, and include, for example, a change amount, a change rate, and a standard deviation. By using these parameters, it is possible to select a base station that is more suitable for increasing the accuracy of specifying the position of the mobile terminal only by comparing the numerical values.

  When receiving the information on the electric field strength, the position specifying unit transmits a confirmation signal, and the information on the position of the portable terminal is displayed in response to the presence or absence of a response from the portable terminal to the confirmation signal. It may be determined whether to output together with information indicating that it has occurred.

  Thereby, it is possible to confirm whether or not the information regarding the electric field intensity transmitted from the mobile terminal is a false report by the position specifying unit according to the presence or absence of a response from the mobile terminal.

  The “confirmation signal” is a signal for confirming with the user carrying the portable terminal that is the transmission source of the information whether or not the received information on the electric field strength is a false report. When receiving the confirmation signal, the portable terminal performs some operation such as making a sound or vibrating to request a response operation from the user.

  This response operation is an operation manually performed by the user, and may be an operation performed on the mobile terminal or an operation performed on another configuration. The position specifying means may determine that it is not a false report when receiving a signal corresponding to the response operation, and may determine that it is a false report when not receiving it, or vice versa.

  The mobile terminal location specifying method according to the present invention uses a mobile communication system in which a base station network (A) is configured so that one mobile terminal (1) can receive radio waves from a plurality of base stations (3). Then, in the mobile terminal location specifying method for specifying the location of the mobile terminal, at least two base stations are selected based on fluctuations of electric field strengths of radio waves received from the plurality of base stations received by the mobile terminal with respect to time. A procedure and a procedure for identifying the position of the mobile terminal based on the electric field strength of the radio wave received by the mobile terminal from the selected at least two base stations and the position of each base station; Solve the above problems.

  According to the mobile terminal position specifying method of the present invention, at least two base stations having electric field strengths used for specifying the position are selected based on the variation of the received electric field strength with respect to time, and the mobile terminal position described above is selected. For the same reason as the specifying system, the position of the mobile terminal can be specified with high accuracy.

  The procedure for selecting and the procedure for specifying the position may all be performed by the mobile terminal, or may be performed by a configuration other than the mobile terminal. Moreover, the procedure for selecting and the procedure for specifying the position may be performed in different configurations. In this case, the information regarding the electric field strength of the base station selected by the selecting procedure may be sent to the configuration in which the procedure for specifying the position is performed.

  In the present invention, an aspect in which a base station is selected on the basis of fluctuations of electric field strength with respect to time, an interpretation about “when a specific state occurs in a mobile terminal”, a base station specifying method, and a mobile terminal position specifying method Is the same as the above-described mobile terminal location specifying system and automatic notification system.

  In addition, the means for selecting selects at least two or more base stations by giving priority to the one having the small variation in the electric field intensity of the radio waves received from the plurality of base stations, as in the above-described automatic notification system. Also good.

  Thereby, for the same reason as the automatic notification system described above, it is possible to increase the accuracy of specifying the position of the mobile terminal. Further, the parameters for comparing the magnitudes of the fluctuations in the electric field strength are the same as in the above-described automatic notification system.

  The mobile terminal (1) according to the present invention is received by the mobile terminal in the mobile communication system in which the base station network (A) is configured so that one mobile terminal can receive radio waves from a plurality of base stations (3). A mobile terminal in an automatic notification system having position specifying means (2) for determining the position of the mobile terminal based on information on electric field strength, and when the mobile terminal is in a specific state, the plurality of base stations A portable terminal that selects at least two base stations based on time-dependent fluctuations in the electric field strength of radio waves received from the mobile station, and transmits information on the electric field strengths of the selected at least two base stations from the portable terminal to the position specifying means. By having the terminal control means (16, 18), the above-mentioned problems are solved.

  With this portable terminal, the automatic notification system of the present invention can be realized.

  According to the present invention, a base station can be selected in consideration of the correlation between the fluctuation state of the received electric field strength with respect to time and the reliability of the received electrolysis strength. Therefore, if a base station that transmits a radio wave indicating a fluctuation state that provides a more reliable received electrolysis strength is selected, the actual distance is determined when the distance between the selected base station and the mobile terminal is obtained. A highly reliable value with less error is obtained, and the position of the portable terminal can be specified with high accuracy based on the distance while using an existing mobile communication system. Accordingly, there is provided a mobile terminal position specifying system, a position specifying method, an automatic notification system, and a mobile terminal used in the system, which can specify the position of the mobile terminal with high accuracy while using an existing mobile communication system. be able to.

  In the following, an embodiment in which an automatic notification system that automatically reports the occurrence of a fall and the position of the portable terminal as the fall location when a worker carrying the portable terminal falls will be described. .

<1. Overall system configuration>
FIG. 1 is a diagram showing an overall configuration of an automatic communication system (hereinafter simply referred to as “the present system”) in the present embodiment. As shown in this figure, this system uses a local mobile communication network A and a local telephone network B connected to the local mobile communication network A as a communication infrastructure. And a notification device 2 connected to a local telephone network B.

  The local mobile communication network A is a base station network that employs an existing PHS communication system and is constructed in a steelworks premises. The PHS standard is standardized by ARIB (Radio Industry), and the PIAFS standard is also defined in the data communication protocol. The PHS base station 3 in the present embodiment is deployed with 40 m mesh in the first floor plane direction, and the height direction is similarly deployed with 40 m mesh on each floor to form a base station network. The terminal 1 in the steelworks premises can receive radio waves from 10 or more PHS base stations 3... 3 at any point. Hereinafter, when it is not particularly necessary to distinguish, it is simply referred to as “base station 3”. The radio wave transmitted from the base station 3 includes a base ID uniquely given to each base station 3 so that the base station 3 can be identified.

  The local telephone network B may be a public line or a dedicated line as long as it can transmit data between two points.

  As a basic function, the terminal 1 has a function of performing a call and data communication via the local mobile communication network A. As an additional function, the terminal 1 detects a fall during work, and the local mobile communication network A And a function of notifying the reporting device 2 of information relating to the occurrence of the fall. Hereinafter, the information regarding the occurrence of the fall notified to the reporting device 2 after the terminal 1 detects the fall is referred to as “fall occurrence information”.

  The reporting device 2 uses the terminal 4a... 4d as the report destination (output destination) based on the fall occurrence information from the terminal 1 as the report destination (output destination). ”) And output to the monitor 5. This reporting destination terminal 4 can communicate with the reporting device 2 via the local mobile communication network A, has the basic functions and additional functions described above, and can also function as the terminal 1. The monitor 5 is an output device directly connected to the notification device 2. Although there is one in FIG. 1, there may be a plurality. Hereinafter, the information regarding the fall reported from the reporting device 2 to the report destination terminal 4 or the monitor 5 is referred to as “falling information”.

  Next, functions of the terminal 1 will be described with reference to a functional block diagram shown in FIG. The terminal 1 includes a transmission / reception unit 10 that transmits / receives radio waves to / from the base station 3, a measurement unit 12 that measures the electric field strength of the received radio waves, a tilt detection unit 14 that detects a fall of the terminal 1, and a program as mobile terminal control means The change amount calculation unit 16 and the base station selection unit 18 controlled by the automatic voice generation unit 19a and the voice output unit 19b.

  In the measurement unit 12, the received electric field strength is measured for each base station 3 based on the radio wave from the base station 3 received by the transmission / reception unit 10. The processing performed in the transmission / reception unit 10 and the measurement unit 12 is the same as the processing performed in an existing PHS mobile terminal.

  The inclination detection unit 14 is a so-called inclination sensor 14 that detects the inclination of the terminal 1. The tilt sensor 14 in this system is based on the time when an ironworks worker wears the terminal 1 and is in a standing posture. For example, the tilt sensor 14 tilts in the range of 360 degrees in the horizontal direction and 60 degrees to 80 degrees in the vertical direction. To detect. The range of the detected inclination angle in the vertical direction can be set arbitrarily. Further, the tilt sensor 14 recognizes as “falling” only when a tilt of about a tilt angle or more continuously detected for a certain time is detected in order to prevent malfunction during work. This time and the tilt angle can be set arbitrarily, and in this system, when a tilt of 70 degrees or more is detected continuously for 30 seconds, it is recognized as a fall. The tilt sensor 14 outputs a fall signal when it detects a fall.

  When the fall signal is input, the change amount calculation unit 16 obtains the change amount of the received electric field strength for each base station 3 while referring to the value of the received electric field strength measured by the measurement unit 12. The amount of change in the present system is obtained as the difference between the maximum value M and the minimum value m of the received electric field strength measured for a certain time with respect to the radio wave from the base station 3.

  The base station selection unit 18 selects three base stations 3 from those having a small change amount of the received electric field intensity calculated by the change amount calculation unit 16, and information on the electric field intensity for the selected base station 3 Create fall occurrence information.

  When the data received by the transmission / reception unit 10 is to be reported as voice, the automatic voice creation unit 19a creates an automatic voice for output based on the data and outputs it from the voice output unit 19b.

  The terminal 1 further has a call function, but a description of the call function is omitted.

  The functions of the reporting device 2 will be described with reference to the functional block diagram shown in FIG. As shown in FIG. 3, the reporting device 2 includes a transmission / reception unit 20, a position specification unit 22, a storage unit 24, and an output unit 26.

  The transmission / reception unit 20 is connected to the local telephone network B and transmits / receives data to / from the local telephone network B.

  The position specifying unit 22 specifies the position of the terminal 1 based on the received electric field strengths of the plurality of base stations 3 and creates fall information.

  The storage unit 24 stores a program for causing the reporting device 2 to function as a position specifying unit, an output destination to which the fall information should be output, and data necessary for processing in the reporting device 2.

  The output unit 26 specifies an output destination to which the fall information should be output from the output destination stored in the storage unit 24 based on the fall information, and outputs the fall information to the specified output destination.

<2. Overall system operation>
In the present system, the flow of processing from when a fall is detected by the tilt sensor 14 until the fall information is reported to the report destination will be described with reference to FIG.

  When the tilt sensor 14 of the terminal 1 detects a fall (step S1), based on the electric field strength of the radio wave received from the base station 3 received by the terminal 1, a certain time of the received electric field strength of each base station 3 The amount of change in is calculated (step S2). Hereinafter, the terminal 1 in which a fall has been detected may be referred to as a “falling terminal 1”.

  When the change amount is obtained for each base station 3, the three base stations 3 are selected in ascending order of change amount (step S3). Further, the electric field strength of the selected base station 3 is specified. Here, the specified electric field strength is used for specifying the position of the falling terminal 1, and may be, for example, the maximum value M of the measured received electric field strength. Moreover, the minimum value m may be sufficient and an average value may be sufficient.

  Next, the fall terminal 1 transmits the fall occurrence information to the reporting device 2 (step S4). The fall occurrence information includes the base ID of the selected base station 3 and the electric field strength value of each base station 3. The details of processing performed at the fall terminal 1 after the fall detection until the transmission of the fall occurrence information will be described later.

  When receiving the fall occurrence information, the reporting device 2 sends a confirmation signal to the fall terminal 1 (step S5). The confirmation signal is not particularly limited as long as the falling terminal 1 can be identified as the confirmation signal. For example, a signal that generates a 15-second pulse every 15 seconds may be used. When the falling terminal 1 receives the confirmation signal, it notifies the worker that the confirmation signal has been received by automatic voice (step S6). In addition to or in addition to this automatic sound, notification may be made by a warning sound, light emission, and vibration.

  If the worker performs a response operation on the fall terminal 1 within a predetermined time after the transmission of the confirmation signal, a response signal corresponding to the response operation is transmitted from the fall terminal 1 (step S7). Upon receiving this response signal, the reporting device 2 recognizes the received fall occurrence information as a false report and does not perform the following processing (steps S8 to S11). The response operation by the worker is not particularly limited as long as it is an operation for transmitting a response signal from the fall terminal 1. For example, a predetermined button operation on the fall terminal 1 may be performed. Moreover, the response signal should just be what the notification apparatus 2 can recognize as a response signal, for example, may only send a pulse once.

  On the other hand, if the response signal is not received within a certain time, the received fall occurrence information is not a false alarm but is recognized as an emergency situation in which the worker falls, and the following processing is continued.

  The reporting device 2 first identifies the position of the fall terminal 1 based on the electric field strengths of the three base stations 3 included in the received fall occurrence information in order to identify the fall position of the worker (step S8). . Processing related to the specification of this position will be described later.

  Next, the terminal 4 that actually reports from the report destination terminal 4 registered in advance in the report device 2 as the report destination is specified (step S9), and information about the occurrence of the fall and its position is reported by automatic voice (step S10). ). Moreover, it outputs also to the monitor 5 connected to the notification apparatus 2 (step S11).

  The report destination terminal 4 specified as the report destination may be specified, for example, as being in the base station 3 within a predetermined distance range from the fall terminal 1 or a base station having a short distance from the fall terminal 1 3 may be specified in the order in which they are located, or the report destination terminal 4 that should be notified may be specified. Moreover, you may report to all the registered report destinations, without specifying a report destination in particular.

  As a mode of reporting to the reporting destination terminal 4, in addition to the automatic voice, light emission or a fall position may be displayed as a map.

<3. Processing in terminal 1>
The flow of processing from when the tilt sensor 14 of the terminal 1 is detected to fall to when the fall occurrence information is transmitted to the reporting device 2 will be described with reference to the flowchart shown in FIG.

  When the tilt sensor 14 detects a fall, a measurement timer is set (step S20), and the value of the received electric field strength is measured for the measurement target radio wave until the measurement timer ends (step S22, step S24). . This measurement timer can set an arbitrary time of 100 milliseconds or more for each base station 3. For example, the time required for adjustment of the measurement of the electric field strength is added to the measurement time of the base station 3 having a different transmission method.

  When the measurement timer ends, the change amount is calculated based on the above-described calculation based on the measured value (step S26). Next, it is determined whether or not the amount of change in the received electric field intensity (hereinafter sometimes simply referred to as “amount of change”) has been calculated for all the base stations 3 receiving the radio wave (step S27). Steps S20 to S26 are repeated until the amount of change is calculated for all base stations 3 that can receive. Note that the number of base stations 3 for calculating the amount of change may be determined in advance. The calculated change amount of each base station 3 is temporarily stored in the storage unit 24 (step S28).

  If it is determined in step S27 that the change amount has been calculated for all the base stations 3, the three base stations 3 are selected in ascending order of the calculated change amount.

  In this selection, not only the three base stations 3 may be selected in ascending order of change amount, but also a threshold value may be determined and only those whose change amount does not exceed the threshold value may be selected. Therefore, if there are only two that do not exceed the threshold, only those two base stations 3 are selected. Thereby, since the base station 3 corresponding to the change amount equal to or greater than the threshold value is not selected, it is possible to always select a reliable electric field strength, and to maintain a certain accuracy in specifying the position of the terminal 1.

  Furthermore, in addition to the amount of change, the magnitude of the electric field strength of each base station can also be used as a reference when selecting the base station 3. For example, when there are three or more base stations 3 whose change amount does not exceed a predetermined threshold value, the base station 3 is selected with priority from the ones having a large electric field strength. Since the magnitude of the electric field strength is inversely proportional to the distance between the base station 3 and the terminal 1 as described above, when there are a large number of base stations 3 with sufficiently small changes, select one with a high electrolytic strength from among them. Thus, the base station 3 with a shorter distance can be selected, and a more reliable radio wave can be selected.

  Further, a plurality of threshold values are determined, the threshold values are changed until the number of base stations 3 that do not exceed the threshold value exceeds three, and the received electric field strength itself is large from among the base stations 3 that belong to the threshold value range at the time of exceeding. You may choose three things.

  When selecting a small change amount, if there is no change amount or if it is smaller than a certain value, it may be processed as an error.

  When the base station 3 is selected, the electric field strength for the selected base station 3 is specified (step S30), and the fall including the base ID of the selected base station 3 and the electric field strength of those base stations 3 is included. Occurrence information is created and transmitted to the reporting device 2 (step S32).

<4. Position identification process in reporting device 2>
A process (hereinafter referred to as “position specifying process”) for specifying the position of the falling terminal 1 performed by the reporting device 2 will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart showing the flow of processing in the position specifying process, and FIG. 7 is a diagram showing how the position is specified.

  In this system, as a method for specifying the position of the fall terminal 1, a method is adopted in which the intersection of the spheres having a radius obtained from the received electric field strength in the manner of triangulation is used as the position of the terminal 1. The position specifying method performed by the reporting device 2 is not limited to this, and any method may be used as long as the position of the terminal 1 is specified based on the electric field intensity transmitted from the plurality of base stations 3. As shown in FIG. 7, a case will be described in which base stations 3d, 3f, and 3h are selected from base stations 3a to 3h from which the falling terminal 1 can receive radio waves.

  First, the radius of the sphere to be drawn is obtained based on the electric field strengths of the base stations 3d, 3f, and 3h included in the received fall occurrence information (step S40). Using the characteristic that electric field strength and distance are inversely proportional, in this system, the reciprocal is the radius. For example, if the electric field strengths of the base stations 3d, 3f, and 3h are 51 dBμV, 70 dBμV, and 32 dBμV, respectively, the radii are (1/51) · K, (1/70) · K, and (1/32) · K, respectively. It becomes. K is a correction (conversion) coefficient.

  Next, the positions of the base stations 3d, 3f, and 3h as the center of the sphere are acquired using a function for managing the position of the base station 3 in the local mobile communication network A (step S42). Further, the reporting device 2 may hold the position of the base station 3.

  Next, a sphere having a radius corresponding to each base station 3d, 3f, 3h is drawn around each base station 3d, 3f, 3h (step S44). The three drawn spheres become spheres P, Q, and R, respectively, as shown in FIG.

  After drawing the spheres P, Q, and R, the intersection S (shaded portion) is specified as the position of the terminal 1. The entire area of the intersection S may be specified as the position where the terminal 1 exists, or the vicinity of the center of the intersection S may be calculated and specified as the position where the terminal 1 exists.

  The present invention is not limited to the embodiments described above, and may be implemented in various forms.

  For example, in the present embodiment, a program as a mobile terminal control unit is installed in the terminal 1 and the terminal 1 is controlled. However, an aspect in which an external device in which such a program is installed is connected to the terminal 1 may be used.

  In the present embodiment, the other terminal (report destination terminal) 4 and the monitor 5 are registered as the output destinations of the position information and the specific state occurrence information. 5 may be output only to 5.

  In the present embodiment, the local mobile communication network A based on the PHS communication system is adopted, but a base station network configured such that one terminal 1 receives radio waves from a plurality of base stations 3 is used. The mobile communication system provided is not limited to this. For example, a communication system employed in a mobile phone may be used.

  The aspect in which the inclination sensor 14 is separated from the terminal 1 and is connected to the terminal 1 by radio or wire may be used. In addition to the inclination sensor 14, the terminal 1 may include a sensor for preventing a secondary disaster such as a CO concentration sensor that detects an abnormality in the CO concentration around the terminal 1. By reporting the CO concentration detected by the CO concentration sensor together with the fall information, a secondary disaster can be prevented.

  In the present embodiment, the amount of change is used as a parameter for comparing the magnitude of fluctuations in the received electric field strength, but the rate of change or standard deviation may be used in addition to the amount of change. The rate of change is determined by the following formula.

  In the present embodiment, the fall terminal 1 selects the base station 3, but the fall occurrence information includes information on the received electric field strength for all the received base stations 3, and the reporting device 2 Three selections may be made.

  In selecting the base station 3, three base stations 3 are selected, but the number of the selected base stations 3 may be at least two. The number selected in advance may be unspecified. For example, all the base stations 3 that satisfy a certain condition such as not exceeding the threshold may be selected.

  Further, the order of processing is not limited to the order described above as long as the present invention can be realized. For example, in this embodiment, the process of specifying the position of the terminal 1 in the notification device 2 is performed after receiving the response signal (step S8 in FIG. 4), but may be started immediately after receiving the fall occurrence information. Further, the process of calculating the amount of change in the terminal 1 (step S2 in FIG. 4) and the process of selecting the base station 3 (step S3 in FIG. 4) are performed only when the response signal (step S4 in FIG. 4) is not received. It may be broken. In this case, in the terminal 1, the fall occurrence information is transmitted immediately after the tilt sensor 14 detects the fall, it is determined whether or not the response signal is received within a certain time, and the change amount when the response signal is not received. And the base station 3 is selected.

Schematic which shows the whole structure of the automatic notification system which concerns on one Embodiment of this invention. Functional block diagram of the portable terminal in the embodiment of FIG. Functional block diagram of the reporting device in the embodiment of FIG. The sequence diagram which shows the whole operation | movement of the system in embodiment of FIG. The flowchart which shows the flow of the process performed with the portable terminal of FIG. The flowchart which shows the flow of the process for the position specification of the portable terminal performed with the notification apparatus of FIG. The figure which shows the situation of the position specific process of a portable terminal shown in FIG.

Explanation of symbols

1 Terminal 2 Reporting Device 3 Base Station 4 Reporting Destination Terminal 5 Monitor 14 Inclination Sensor A Local Mobile Communication Network

Claims (7)

A mobile terminal position identifying system in a mobile communication system in which a base station network is configured so that one mobile terminal can receive radio waves from a plurality of base stations,
Select at least two base stations on the basis of fluctuations of the electrolysis strength of radio waves received from the plurality of base stations with respect to time, and transmit predetermined information from the mobile terminal regarding the electrolysis strength of the selected at least two base stations. Portable terminal control means for sending to the destination;
A position specifying unit that is provided as the predetermined transmission destination and obtains the position of the mobile terminal based on the received information on the electrolytic strength and the position information of each base station;
A mobile terminal location system characterized by the above. An automatic notification system using a mobile communication system in which a base station network is configured so that one mobile terminal can receive radio waves from a plurality of base stations,
When a specific state occurs in the portable terminal, the mobile terminal selects at least two base stations based on a change with respect to time of electric field strength of radio waves received from the plurality of base stations, and the selected at least two base stations Mobile terminal control means for transmitting information on the electric field strength of the mobile terminal to a predetermined transmission destination;
Based on the received information on the electric field strength and the position information of each base station, the position of the mobile terminal is obtained as the predetermined transmission destination, and the information on the position indicates that the specific state has occurred Position specifying means for outputting to at least one output destination registered in advance together with information;
An automatic notification system characterized by comprising: The said portable terminal control means selects at least 2 or more base stations giving priority to the thing with the said small fluctuation | variation of the electric field strength of the electromagnetic wave received from these base stations, The 2nd aspect is characterized by the above-mentioned. Automatic notification system. When receiving the information on the electric field strength, the position specifying unit transmits a confirmation signal to the portable terminal, and depending on whether there is a response from the portable terminal to the confirmation signal, information on the position of the portable terminal 4. The automatic notification system according to claim 2, wherein whether or not to output together with information indicating that a specific state has occurred is determined. In the mobile terminal location specifying method for specifying the location of the mobile terminal using a mobile communication system configured with a base station network so that one mobile terminal can receive radio waves from a plurality of base stations,
A procedure for selecting at least two base stations based on fluctuations of electric field strength of radio waves from the plurality of base stations received by the mobile terminal with respect to time;
A procedure for identifying the position of the mobile terminal based on the electric field strength of the radio wave received by the mobile terminal from the selected at least two base stations, and the position of each base station;
A method for specifying a position of a mobile terminal, comprising: 6. The portable terminal according to claim 5, wherein the selecting step selects at least two or more base stations by giving priority to the one having the small variation in electric field intensity of radio waves received from the plurality of base stations. Terminal location method. Location determination for determining the position of a mobile terminal based on information on the field strength received by the mobile terminal in a mobile communication system configured with a base station network so that one mobile terminal can receive radio waves from a plurality of base stations A portable terminal in an automatic notification system having means,
When a specific state occurs in the portable terminal, the mobile terminal selects at least two base stations based on a change with respect to time of electric field strength of radio waves received from the plurality of base stations, and the selected at least two base stations A portable terminal in an automatic notification system, comprising portable terminal control means for transmitting information related to the electric field strength from the portable terminal to the position specifying means.

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