JP2005286864A - Mobile communication terminal, location positioning server, location positioning system, and location positioning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal capable of conducting highly accurate location positioning with a simple configuration. <P>SOLUTION: A cellular phone 1 according to the present invention is connected in radio to a PHS (Personal Handyphone System) base station C and a PDC (Personal Digital Cellular) base station having a distribution density less than the PHS base station C. The cellular phone 1 comprises a control portion 2, a PHS receiving portion 7, and a PDC radio portion 8. The control portion 2 measures a reception level of the PHS base station C. The PHS receiving portion 7 receives a PHS base station ID. The PDC radio portion 8 transmits the reception level measured by the control portion 2 to the PDC base station C, along with the PHS base station ID received by the PHS receiving portion 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile communication terminal, a position positioning server, a position positioning system, and a position positioning method.

  2. Description of the Related Art Conventionally, with the development of wireless communication technology, a position positioning system that estimates the current position of a mobile communication terminal and notifies a user of the estimation result as position information has been put into practical use. Examples of the mobile communication terminal include a PHS (Personal Handyphone System) and a mobile phone. Since the cell area of PHS is narrower than the cell area of a mobile phone, the distribution density of base stations is generally higher in PHS than in mobile phones. For this reason, a position positioning system using PHS can perform position positioning with higher accuracy than a position positioning system using a mobile phone. Specifically, the position positioning accuracy with a mobile phone is about several hundreds of meters, whereas with PHS, it is about several tens of meters.

On the other hand, mobile phones have features such as communication at high speed and a wide communication area. A mobile communication terminal in which a PDC (Personal Digital Cellular) type mobile phone and a PHS are integrated has been proposed in order to have the features of both the PHS and the mobile phone as described above (see, for example, Patent Document 1). ).
JP-A-11-355828 (page 2-3)

  However, the above prior art has the following problems. That is, since the mobile phone and the PHS use different frequency bands and data communication methods, the base stations used are also different. Therefore, a mobile communication terminal in which a mobile phone and a PHS are integrated needs to include both a radio unit that communicates (transmits and receives) with a PHS base station in addition to a radio unit that communicates with a mobile phone base station. is there. As a result, the circuit configuration of the mobile communication terminal becomes complicated and the price is high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a mobile communication terminal, a positioning server, a positioning system, and a positioning method that can easily realize highly accurate positioning. .

  A mobile communication terminal according to the present invention includes a first base station (for example, a PHS base station C) arranged in a first mobile communication system, and a second mobile communication system, which is more than the first base station. Wirelessly connected to both the second base station (for example, PDC base station B) having a low distribution density. In addition, the mobile communication terminal includes a measuring unit that measures a reception level of radio waves from the first base station, an identification information receiving unit that receives identification information of the first base station, and the measurement unit that is measured by the measuring unit. Reception level transmitting means for transmitting the reception level to the second base station together with the identification information received by the identification information receiving means.

  In addition, the positioning server according to the present invention communicates with the mobile communication terminal via the second base station. The positioning server comprises: a reception level receiving means for receiving the reception level and the identification information transmitted by the reception level transmitting means of the mobile communication terminal; and the reception level and the identification information received by the reception level receiving means. And a position information transmitting means for transmitting information on the position of the mobile communication terminal estimated by the position estimating means.

  Further, the positioning method according to the present invention includes a first base station arranged in the first mobile communication system and a second base station arranged in the second mobile communication system and having a distribution density lower than that of the first base station. A mobile communication terminal wirelessly connected to both the base station and a position positioning server that communicates with the mobile communication terminal via the second base station are used. The positioning method includes a measuring step in which the mobile communication terminal measures a reception level of radio waves from the first base station, and an identification information receiving step in which the mobile communication terminal receives identification information of the first base station. A reception level transmission step in which the mobile communication terminal transmits the reception level measured in the measurement step together with the identification information received in the identification information reception step to the second base station; The reception level and the identification information transmitted in the reception level transmission step are received by the reception level reception step received by the positioning server, and the reception level and the identification information received in the reception level reception step. Based on this, the position measurement server transmits a position estimation step for estimating the position of the mobile communication terminal, and information on the position of the mobile communication terminal estimated in the position estimation step Including a position information transmitting step that, a.

  According to these inventions, the position of the mobile communication terminal is estimated using the reception level of radio waves from the first base station having a higher distribution density than the second base station. Therefore, highly accurate position measurement is possible. Further, since the mobile communication terminal receives only the identification information from the first base station, no transmission means to the first base station is necessary. That is, the mobile communication terminal according to the present invention can be realized with a simple configuration in which means (for example, PHS receiving unit 7) for receiving identification information from the first base station is added to the conventional mobile phone. Therefore, compared with a mobile communication terminal in which a mobile phone and a PHS are integrated, manufacturing cost and price can be suppressed.

  Moreover, in the mobile communication terminal according to the present invention, the measuring means measures the reception level of radio waves from a plurality of first base stations, and the identification information receiving means is provided for each of the first base stations at the plurality of places. The reception level transmitting means transmits the plurality of reception levels measured by the measuring means to the second base station together with the plurality of identification information received by the identification information receiving means. It is preferable.

  In the positioning server according to the present invention, the reception level receiving means receives a plurality of reception levels and a plurality of identification information transmitted by the reception level transmission means of the mobile communication terminal, and the position estimation means includes the It is preferable that the position of the mobile communication terminal is estimated based on the plurality of reception levels received by the reception level receiving unit and the plurality of identification information.

  In the positioning method according to the present invention, the mobile communication terminal measures reception levels of radio waves from a plurality of first base stations in the measurement step, and the mobile communication terminal in the identification information reception step. The terminal receives the identification information of each of the plurality of first base stations, and receives the plurality of reception levels measured in the measurement step in the reception level transmission step in the identification information reception step. The plurality of identification information transmitted to the second base station, and in the reception level reception step, the plurality of reception levels and the plurality of identification information transmitted in the reception level transmission step, It is preferable that the positioning server receives.

  According to these inventions, a plurality of reception levels of radio waves from a plurality of first base stations are measured, and a position of the mobile communication terminal is estimated based on the plurality of reception levels. Therefore, the measurement error of the reception level is small compared to the case where the reception level of the radio wave from one first base station is measured. As a result, more accurate positioning can be performed.

  The position measuring server according to the present invention preferably further comprises position information transmitting means for transmitting information indicating the position estimated by the position estimating means to the mobile communication terminal.

  Further, the position positioning method according to the present invention preferably further includes a position information transmitting step in which the position positioning server transmits information indicating the position estimated in the position estimating step to the mobile communication terminal. .

  According to these inventions, the information indicating the estimated position of the mobile communication terminal is transmitted to the mobile communication terminal. The information indicating the position is estimated based on the reception level of radio waves from the first base station having a distribution density higher than that of the second base station. Therefore, when the mobile communication terminal receives and displays information indicating the position, the user of the mobile communication terminal can grasp the current position with high accuracy.

  The position positioning server according to the present invention preferably further comprises position related information transmitting means for transmitting position related information related to the position estimated by the position estimating means to the mobile communication terminal.

  The position positioning method according to the present invention further includes a position related information transmitting step in which the position positioning server transmits position related information related to the position estimated in the position estimating step to the mobile communication terminal. It is preferable.

  According to these inventions, the information transmitted to the mobile communication terminal is position related information related to the estimated position of the mobile communication terminal. The position related information is, for example, image data obtained by plotting the position of the nearest shop or station on the map from the mobile communication terminal. When the mobile communication terminal receives and displays such position related information, the user of the mobile communication terminal can know the current position easily and quickly compared to the case where the information indicating the position is transmitted as it is.

  Furthermore, the mobile communication terminal described above and the position positioning server described above may be provided, and the system may be constructed or operated as a position positioning system that performs communication between the mobile communication terminal and the position positioning server.

  According to the present invention, the position of the mobile communication terminal is estimated using the reception level of radio waves from the first base station having a higher distribution density than the second base station. Therefore, highly accurate position measurement is possible. Further, since the mobile communication terminal receives only the identification information from the first base station, no transmission means to the first base station is necessary. That is, the mobile communication terminal according to the present invention can be realized with a simple configuration in which means for receiving identification information from the first base station is added to the conventional mobile phone. Therefore, compared with a mobile communication terminal in which a mobile phone and a PHS are integrated, manufacturing cost and price can be suppressed.

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

  First, the configuration will be described. FIG. 1 is a schematic diagram illustrating an example of the overall configuration of a position positioning system 100 in the present embodiment. As shown in FIG. 1, the position positioning system 100 includes a mobile phone 1, a position positioning server 11, and a position presentation server 21. The mobile phone 1 is connected to the PHS network N1 via the PHS base station C and connected to the PDC network N2 via the PDC base station B. In addition, a position positioning server 11 and a position presentation server 21 are wired to the PDC network N2. The PHS network N1 is a known ISDN network, and the PDC network N2 is a known packet communication network.

  The PHS base station C is a base station for transmitting / receiving data to / from the PHS. However, the mobile phone 1 includes a radio reception unit corresponding to the frequency band of PHS, so that a signal from the PHS base station C can be obtained. Can also be received. The PDC base station B is a base station for transmitting / receiving data to / from a mobile phone. The PHS base station C is installed at intervals of about 100 to 500 m, and the PDC base station B is installed at intervals of about 500 m to 10 km. Therefore, the distribution density of the PHS base station C is higher than the distribution density of the PDC base station B. The PDC base station B is not necessarily a base station for communicating with a PDC mobile phone, but may be a base station for communicating with a CDMA mobile phone.

  Hereinafter, the internal configuration of the mobile phone 1 will be described in detail with reference to FIG. FIG. 2 is a block diagram showing a functional configuration of the mobile phone 1. As shown in FIG. 2, the mobile phone 1 includes a control unit 2 (corresponding to measurement means), an input unit 3, a RAM 4, a display unit 5, a storage unit 6, a PHS receiving unit 7 (corresponding to identification information receiving means), a PDC. The radio unit 8 (corresponding to the reception level transmitting means), the switching unit 9 and the audio processing unit 10 are connected to each other so that various signals can be input / output via the bus.

  The control unit 2 includes a ROM (Read Only Memory) 2a, reads a program stored in advance in the ROM 2a, develops it in the RAM 4, and centrally controls each unit according to the program. That is, the control unit 2 executes a position positioning process (see FIG. 7) described later in accordance with an input signal from the input unit 3 and a program developed in the RAM 4, temporarily stores the processing result in the RAM 4, and displays the display unit. 5 is displayed. And the process result memorize | stored in RAM4 is stored in the predetermined area | region in the memory | storage part 6 as needed.

  The input unit 3 is configured with various operation buttons for instructing a positioning request, power ON / OFF, function selection, etc., and these various operation buttons are individually or in combination to be pressed. An input signal corresponding to is output to the control unit 2.

  A RAM (Random Access Memory) 4 is composed of a semiconductor or the like, and temporarily stores a program read from the ROM 2 a and data read from the storage unit 6 in various processes executed by the control unit 2. The RAM 4 also has a VRAM (Video RAM) function for temporarily storing data to be displayed on the display unit 5.

  In addition, the RAM 4 temporarily forms a reception level storage area 41 when performing a position positioning process described in detail later. Hereinafter, an example of data storage in the reception level storage area 41 will be described with reference to FIG.

  The reception level storage area 41 includes at least a PHS base station ID storage unit 41a and a reception level storage unit 41b. The PHS base station ID storage unit 41a stores data (for example, “001”, “003”, “006”) uniquely assigned to identify the PHS base station C as “PHS base station ID”. . The PHS base station ID is included in the broadcast information transmitted by the PHS base station C. The reception level storage unit 41b stores numerical data (for example, “100”, “80”, “50”) indicating the radio wave intensity between the mobile phone 1 and the PHS base station C as “reception level”. The PHS base station ID and the reception level are stored in association with each other.

  The display unit 5 is configured by an LCD (Liquid Crystal Display), an EL (Electro Luminescence), or the like, and displays display data such as position information on the screen according to a display signal input from the control unit 2.

  The storage unit 6 includes a nonvolatile semiconductor memory such as an EEPROM (Electrically Erasable and Programmable ROM), and stores data necessary for various processes executed by the control unit 2, generated data, and the like.

  The PHS receiving unit 7 is a circuit having a modulation / demodulation unit (not shown) that performs signal modulation / demodulation and a codec / decoding unit (not shown) that performs signal codec decoding, and includes an antenna 7a. The antenna 7 a is provided on the upper part of the casing of the mobile phone 1 so as to be extendable and contractable, and receives data from the PHS base station C. The modem unit demodulates the signal input from the antenna 7a into a signal that can be processed by the codec unit. The codec decoding unit is configured by a codec (CODEC), and performs processing (decoding) for converting a digital signal input from the modem unit into an analog signal.

  The PDC wireless unit 8 has the same basic configuration as that of the PHS receiver 7, but is different in that it has a transmission function. That is, the PDC radio unit 8 is a circuit having a modulation / demodulation unit (not shown) that performs signal modulation / demodulation and a codec / decoding unit (not shown) that performs signal codec decoding, and includes an antenna 8a. The antenna 8 a is provided on the upper part of the casing of the mobile phone 1 so as to be extendable and contracted, and transmits and receives data to and from the PDC base station B.

  At the time of reception, the modem unit performs a process of demodulating the signal input from the antenna 8a into a signal that can be processed by the codec unit. On the other hand, at the time of transmission, a process of modulating the digital signal converted by the codec to a signal that can be wirelessly transmitted is performed. The codec is configured by a codec, and at the time of reception, performs processing (decoding) for converting a digital signal input from the modem to an analog signal. On the other hand, at the time of transmission, a process (encoding) for converting an analog signal such as an audio signal into a digital signal is performed, and the converted digital signal is compressed to a data amount suitable for transmission.

  The switching unit 9 is a circuit that switches one of the circuits of the PHS receiving unit 7 and the PDC radio unit 8 to a connected state in accordance with an instruction signal input from the control unit 2. That is, signal input / output between the control unit 2 and the PHS reception unit 7 is performed via the switching unit 9. Similarly, input / output of signals between the control unit 2 and the PDC radio unit 8 is performed via the switching unit 9.

  The audio processing unit 10 includes a converter, an amplifier, and the like, and includes a microphone 10a and a speaker 10b. The voice processing unit 10 converts voice data input from the control unit 2 into an analog signal by a converter and emits sound from the speaker 10b through an amplifier during a call. Also, the voice processing unit 10 converts a voice signal input from the microphone 10 a into a digital signal that can be wirelessly communicated by a converter during a call, and outputs the digital signal to the PDC radio unit 8 via the switching unit 9.

  Next, the internal configuration of the position positioning server 11 will be described with reference to FIG. FIG. 4 is a block diagram showing a functional configuration of the position positioning server 11. As shown in FIG. 4, the position measurement server 11 includes a CPU 12 (corresponding to position estimation means), an input unit 13, a display unit 14, a communication control unit 15 (reception level reception means, position information transmission means, and position related information). (Corresponding to transmission means), a RAM 16 and a storage unit 17, each of which is a computer connected by a bus.

  A CPU (Central Processing Unit) 12 reads out various programs stored in the storage unit 17 and develops them in the RAM 16, and centrally controls the operation of each unit according to the programs. Further, the CPU 12 executes a position positioning process (see FIG. 7), which will be described later, according to a program developed in the RAM 16, stores the processing result in the RAM 16, and causes the display unit 14 to display it. Then, the processing result stored in the RAM 16 is stored in a predetermined storage destination of the storage unit 17.

  The input unit 13 includes a keyboard having character / number input keys, cursor keys, various function keys, and the like, and a mouse that is a pointing device. Is output to the CPU 12 as an input signal.

  The display unit 14 is configured by an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), and displays various types of information on the screen according to instructions of a display signal input from the CPU 12.

  The communication control unit 15 is connected to the PDC base station B via the PDC network N2, and transmits / receives data to / from the mobile phone 1.

  A RAM (Random Access Memory) 16 temporarily stores various programs, input or output data, parameters, and the like, which are read from the storage unit 17 and can be executed in the various processes that are controlled by the CPU 12. A large storage area.

  The storage unit 17 stores a program necessary for executing a position positioning process described later. As shown in FIG. 5, the storage unit 17 includes at least a distance table 171 and a position table 172 described later. Hereinafter, an example of data storage in each table will be described in detail with reference to FIGS.

  FIG. 5 is a table in which the distance table 171 can refer to the correspondence between the reception level and the distance between the mobile phone and the PHS base station. The distance table 171 includes at least a reception level storage area 171a and a distance storage area 171b. The reception level storage area 171a stores a range of numerical data indicating radio wave intensity (for example, “0”, “1-5”, “6-10”,...) As “reception level”. The distance storage area 171b sets a range of numerical data indicating the distance between the mobile phone 1 and the PHS base station C (for example, “501 or more”, “481 to 500”, “461 to 480”,...) As “distance”. Store.

  In FIG. 6, the position table 172 includes at least a PHS base station ID storage area 172a and a reception level storage area 172b. The PHS base station ID storage area 172a uses data (eg, “001”, “002”, “003”,...) Uniquely assigned to identify the PHS base station C as “PHS base station ID”. Store. The reception level storage area 172b is data indicating the longitude and latitude of the position where the PHS base station C is installed (for example, “N: 34.44.06, E: 135.34.34”, “N: 34.44.20, E: 135.34.36 ", ...) is stored as" longitude / latitude ". The PHS base station ID and the longitude / latitude are stored in association with each other.

  The configuration of the mobile phone 1 and the position positioning server 11 constituting the position positioning system 100 according to the present invention has been described above. However, the main configuration of the position presentation server 21 necessary for carrying out the present invention in a more preferable form. Since this is the same as the main configuration of the position measurement server 11, the same reference numerals are given to the respective components, and illustration and description of the configuration will be omitted. That is, the position presentation server 21 includes a CPU 22, an input unit 23, a display unit 24, a communication control unit 25, a RAM 26, and a storage unit 27, and each unit is connected by a bus.

  Next, the operation in this embodiment will be described with reference to FIG. FIG. 7 is a flowchart for explaining the positioning process. First, in S <b> 1, the control unit 2 requests positioning of the current position of the mobile phone 1. This request may be made by the user of the mobile phone 1 via the input unit 3, or for example, automatically performed by the control unit 2 in response to reception of a signal from an external device such as the position positioning server 11. It may be a thing.

  In next S <b> 2, the control unit 2 switches the communication means from the PDC radio unit 8 to the PHS reception unit 7. This switching process is performed by the switching unit 9. When the communication means is switched to the PHS receiving unit 7, the control unit 2 starts measuring the reception level of the PHS base station C located around the mobile phone 1 (S3).

  Since the method for measuring the reception level is well known in the conventional PHS, the detailed description is omitted, but the control unit 2 monitors the radio wave intensity between the PHS base station C and the antenna 7a via the PHS receiving unit 7. By doing. In addition, the reception level is preferably measured for at least three PHS base stations C from the viewpoint of positioning accuracy.

  In next S 4, the PHS base station C transmits the corresponding PHS base station ID to the mobile phone 1. The cellular phone 1 receives the PHS base station ID by the PHS receiving unit 7, and stores the received PHS base station ID in each storage unit in the reception level storage area 41 in association with the reception level measured in S3. (S5). As a result, as shown in FIG. 3, for example, three types of PHS base station IDs and reception levels are stored.

  In next S <b> 6, the control unit 2 switches the communication means from the PHS reception unit 7 to the PDC radio unit 8. This switching process is performed by the switching unit 9. When the communication means is switched to the PDC radio unit 8, the mobile phone 1 transmits the PHS base station ID and the reception level to the position positioning server 11 (S7). This transmission process is performed by the control unit 2 via the PDC radio unit 8.

  In next S8, the positioning server 11 receives the PHS base station ID and the reception level by the communication control unit 15. Then, the CPU 12 calculates the longitude and latitude of the mobile phone 1 based on the received PHS base station ID and the reception level (S9). The longitude and latitude calculation processing is executed as follows, for example.

  That is, the CPU 12 refers to the distance data stored in the distance table 171 shown in FIG. 5 and estimates the distance between the PHS base station C and the mobile phone 1 corresponding to each PHS base station ID. This process is executed as many times as the number of received PHS base station IDs. For example, when the positioning server 11 receives three types of PHS base station IDs, an area where three circles centered on each PHS base station C and whose estimated distance is a radius overlaps is relative to the mobile phone 1. Position.

  Subsequently, the CPU 12 reads the longitude / latitude data stored in the position table 172 shown in FIG. Then, the CPU 12 calculates the longitude and latitude of the mobile phone 1 based on the estimated relative position of the mobile phone 1 and the read longitude and latitude data.

  In next S <b> 10, the position measurement server 11 transmits the calculated longitude and latitude as position information to the mobile phone 1. Finally, the mobile phone 1 receives the position information by the PDC radio unit 8 (S11), displays the position information on the display unit 5 in a predetermined display form (S12), and ends the series of position positioning processes.

  In addition, although the example which the mobile telephone 1 receives and displays a positional information in S11-S12 was demonstrated, it does not necessarily need to receive positional information itself. That is, the position presentation server 21 connected to the PDC network N2 may temporarily receive position information from the position positioning server 11 and generate desired display data based on the received position information. The display data can be arbitrarily applied according to the software stored in the mobile phone 1. For example, the mobile phone 1 plots and presents the location of the nearest store or station on a map. Thereby, compared with the case where position information is displayed as it is, the user can know the current position easily and quickly.

  As described above, according to the positioning system 100 in the present embodiment, the mobile phone 1 uses the reception level of the PHS base station C, which has a higher distribution density than the PDC base station B, to Estimate the position. Therefore, highly accurate position measurement is possible. Further, the mobile phone 1 receives only the PHS base station ID from the PHS base station C. Therefore, the user does not have to make a line contract for using PHS. As a result, compared to the case of using a mobile communication terminal in which a mobile phone and a PHS are integrated, the contract fee and the line usage fee are low, and the line contract procedure is easy. The configuration of the mobile phone 1 is the same as that of a conventional mobile phone except that a PHS receiving unit 7 and a switching unit 9 are added. Therefore, the configuration is simple compared to a mobile communication terminal in which a mobile phone and a PHS are integrated, and the manufacturing cost and price can be reduced.

  In addition, the aspect described in this embodiment is a suitable example of the position positioning system which concerns on this invention, and is not limited to this. For example, in the present embodiment, the position positioning server 11 and the position presentation server 21 are configured separately, but each server may be the same body. That is, the position positioning server 11 may generate display data based on the estimated position and transmit it to the mobile phone 1. This simplifies the system configuration and shortens the time from position estimation to transmission.

It is a schematic diagram which shows the example of whole structure of a position positioning system. It is a block diagram which shows the functional structure of a mobile telephone. It is a figure which shows the example of data storage in a reception level storage area. It is a block diagram which shows the functional structure of a position positioning server. It is a figure which shows the example of data storage in a distance table. It is a figure which shows the example of data storage in a position table. It is a flowchart explaining a position positioning process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile phone, 2 ... Control part, 3 ... Input part, 4 ... RAM, 41 ... Reception level storage area, 5 ... Display part, 6 ... Memory | storage part, 7 ... PHS reception part, 8 ... PDC radio | wireless part, 9 ... Switching unit, 10 ... Audio processing unit, 11 ... Position positioning server, 12 ... CPU, 13 ... Input unit, 14 ... Display unit, 15 ... Communication control unit, 16 ... RAM, 17 ... Storage unit, 171 ... Position table, 172 ... Distance table, 21 ... Location presentation server, 100 ... Positioning system, B ... PDC base station, C ... PHS base station

Claims (7)

Wirelessly connected to both the first base station disposed in the first mobile communication system and the second base station disposed in the second mobile communication system and having a distribution density lower than that of the first base station. In mobile communication terminals,
Measuring means for measuring the reception level of radio waves from the first base station;
Identification information receiving means for receiving identification information of the first base station;
A mobile communication terminal comprising: a reception level transmitting means for transmitting the reception level measured by the measuring means together with the identification information received by the identification information receiving means to the second base station. . The measuring means measures the reception level of radio waves from a plurality of first base stations,
The identification information receiving means receives identification information of each of the plurality of first base stations,
The reception level transmitting means transmits a plurality of reception levels measured by the measuring means to the second base station together with a plurality of identification information received by the identification information receiving means. The mobile communication terminal according to 1. A position positioning server that communicates with the mobile communication terminal according to claim 1 through the second base station,
Reception level receiving means for receiving the reception level and the identification information transmitted by the reception level transmitting means of the mobile communication terminal;
A position positioning server comprising: position estimation means for estimating the position of the mobile communication terminal based on the reception level received by the reception level receiving means and the identification information.   The position positioning server according to claim 3, further comprising position information transmitting means for transmitting information indicating the position estimated by the position estimating means to the mobile communication terminal.   The position positioning server according to claim 3, further comprising position related information transmitting means for transmitting position related information related to the position estimated by the position estimating means to the mobile communication terminal. The reception level receiving means receives a plurality of reception levels and a plurality of identification information transmitted by the reception level transmitting means of the mobile communication terminal,
The position estimation means estimates the position of the mobile communication terminal based on the plurality of reception levels and the plurality of identification information received by the reception level reception means. The positioning server according to any one of the above. Wirelessly connected to both the first base station disposed in the first mobile communication system and the second base station disposed in the second mobile communication system and having a distribution density lower than that of the first base station. In a position positioning method using a mobile communication terminal and a position positioning server that performs communication via the mobile communication terminal and the second base station,
A measuring step in which the mobile communication terminal measures a reception level of radio waves from the first base station;
An identification information receiving step in which the mobile communication terminal receives the identification information of the first base station;
The reception level measured in the measurement step, together with the identification information received in the identification information reception step, the mobile communication terminal transmits to the second base station, a reception level transmission step,
A reception level receiving step in which the positioning server receives the reception level and the identification information transmitted in the reception level transmission step;
A position estimation method in which the position measurement server estimates the position of the mobile communication terminal based on the reception level and the identification information received in the reception level reception step. .

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