JP4572698B2 - Portable terminal device, wireless communication system, position information calculation method, and program - Google Patents

Description

  The present invention relates to a mobile terminal device capable of communication using an ad hoc network system, a wireless communication system thereof, a position information calculation method in the mobile terminal device, and a program thereof.

  According to the wireless communication technology using the ad hoc network system, even if the mobile terminal device is in a place where data cannot be transmitted directly from the base station by providing the mobile terminal device with a data relay function, other mobile terminal devices The data from the base station can be obtained via

  However, since the position of each mobile terminal device is not fixed, it is difficult to determine a communication path for data transmission / reception, and in particular, when there is no position information of the mobile terminal device, an effective route toward the target mobile terminal device Is not efficient because cannot be selected.

For this reason, GPS (Global Positioning System) may be used to obtain position information (see, for example, Patent Document 1).
JP 2004-56333 A

  However, in the wireless communication technology using an ad hoc network, obtaining position information using GPS as described above has the following problems.

  The first problem is that it is necessary to receive radio waves from a plurality of satellites by a mobile terminal device, and therefore location information cannot be obtained if the mobile terminal device is not in an environment where GPS can be used. .

  The second problem is that the mobile terminal device needs to have a GPS function, and thus costs are high.

  The present invention has been made to solve the above problems, and in a wireless communication technology using an ad hoc network, a mobile terminal capable of obtaining position information even if the mobile terminal device does not have a GPS function. An object is to provide a device, a wireless communication system, a position information calculation method, and a program thereof.

In order to solve the above-described problems, a mobile terminal device according to the present invention is based on position information of a plurality of base stations and the number of hops from each base station in a mobile terminal device capable of ad hoc network communication. And a rough position information calculating means for calculating own rough position information. When there is one or more other mobile terminal devices that relay and notify the location information of one base station to the mobile terminal device, each of the other mobile terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device.

  In the mobile terminal device of the present invention, when the base station location information acquisition means for acquiring the location information of the base station transmitted from the base station, and the location information of the base station is acquired by the base station location information acquisition means When the position information of the base station is acquired by the hop number recognition means for recognizing the number of hops from the base station as “1” and the base station position information acquisition means, the acquired position information A first notification means for notifying the other mobile terminal apparatus of information indicating the number of hops “1” from the base station, and the position of the base station notified from the other mobile terminal apparatus Notification information acquisition means for acquiring information and information on the number of hops of the other mobile terminal device, and when the information from the other mobile terminal device is acquired by the notification information acquisition means, Information on the number of hops of the mobile terminal device Hop number calculating means for calculating the number of hops by adding “1” to the number of hops, and when information from another portable terminal device is acquired by the notification information acquiring means, A second notification means for notifying other mobile terminal devices of the position information of the station and the number of hops calculated by the hop number calculation means, the approximate position information calculation means, Position information of a plurality of base stations acquired by the notification information acquisition means and / or the base station position information acquisition means, and each calculated and / or recognized by the hop number calculation means and / or the hop number recognition means It is preferable to calculate the approximate position information based on the number of hops from the base station.

  In the mobile terminal device of the present invention, the correction unit performs correction using the SOM (self-organizing map) algorithm on the approximate position information obtained by the approximate position information calculation unit, thereby correcting the outline. It is preferable that the position information is more accurate position information.

  The wireless communication system of the present invention is a wireless communication system including a plurality of mobile terminal devices capable of communication by an ad hoc network method and a plurality of base stations, wherein each of the mobile terminal devices is a mobile terminal device of the present invention. It is characterized by being.

  In the wireless communication system of the present invention, each of the base stations preferably transmits its own ID and position information to the mobile terminal device at predetermined time intervals.

The location information calculation method of the present invention is a method of calculating own approximate location information in a mobile terminal device capable of communication by an ad hoc network method, wherein the mobile terminal device includes location information of a plurality of base stations, It is characterized by comprising a first calculation step of calculating own approximate position information based on the number of own hops from each base station. In the first calculation process, when there is one or more other portable terminal devices that relay and notify the position information of one base station to the portable terminal device, each of the other portable terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device.

  In the location information calculation method of the present invention, the mobile terminal device acquires a location information of the base station transmitted from the base station, and the mobile terminal device is transmitted from the base station. When the position information of the base station is acquired by the first acquisition process, a recognition process for recognizing that the number of hops from the base station is “1”, and the mobile terminal device is transmitted from the base station In addition, when the location information of the base station is acquired by the first acquisition process, the acquired location information and information indicating the number of hops “1” from the base station are received by another mobile terminal device. A first notification process of notifying the mobile station, and the mobile terminal device acquires the location information of the base station and the information on the number of hops of the other mobile terminal device notified from the other mobile terminal device Acquisition process, and the portable terminal device is another portable terminal When the information notified from the device is acquired by the second acquisition process, the number of hops by adding “1” to the hop number indicated by the information on the number of hops of the other mobile terminal device among the information. And when the mobile terminal device acquires information notified from another mobile terminal device through the second acquisition process, the location information of the base station among the information, A second notification step of notifying another mobile terminal device of the number of hops calculated by the second calculation step, wherein the first acquisition includes the first acquisition step. Location information of a plurality of base stations acquired in the process and / or the second acquisition process, and own hops from each base station calculated and / or recognized in the second calculation process and / or the recognition process The approximate position based on the number It is preferable to calculate the information.

  In the position information calculation method of the present invention, the mobile terminal device performs correction using a SOM (self-organizing map) algorithm on the approximate position information obtained by the first calculation process, It is preferable to further include a correction process for making the approximate position information more accurate position information.

The program of the present invention is a computer-executable program based on position information of a plurality of base stations and the number of hops from each base station in a mobile terminal device capable of communication by an ad hoc network method. Then, a first calculation process for calculating the self approximate position information is executed. In the first calculation process, when there is one or more other mobile terminal devices that relay and notify the location information of one base station to the mobile terminal device, each of the other mobile terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device.

  In the program of the present invention, in the mobile terminal device, the first acquisition process for acquiring the position information of the base station transmitted from the base station, and the position information of the base station transmitted from the base station are A recognition process for recognizing that the number of hops from the base station is “1” when acquired by the first acquisition process, and the position information of the base station transmitted from the base station is the first acquisition process. A first notification process for notifying other mobile terminal devices of the acquired location information and information indicating the own hop number “1” from the base station, The second acquisition process for acquiring the location information of the base station notified from the mobile terminal device and the information on the number of hops of the other mobile terminal device, and the second acquisition of the information notified from the other mobile terminal device If the information is obtained by processing, Second calculation processing for calculating the number of hops by adding “1” to the number of hops indicated by the information on the number of hops of the terminal device, and the second acquisition processing for information notified from other portable terminal devices A second notification process for notifying the other mobile terminal device of the location information of the base station and the number of hops calculated by the second calculation process among the information. In the first calculation process, the location information of the plurality of base stations acquired by the first acquisition process and / or the second acquisition process, the second calculation process, and / or the It is preferable to calculate the approximate position information based on the number of hops from each base station calculated and / or recognized by the recognition process.

  In the program of the present invention, the approximate position information obtained by the first calculation process is corrected by using a SOM (self-organizing map) algorithm, whereby the approximate position information is obtained with higher accuracy. It is preferable to further execute a correction process for converting the position information.

  According to the present invention, the mobile terminal apparatus includes the approximate position information calculating means for calculating the own approximate position information based on the position information of the plurality of base stations and the number of hops from each base station. Thus, it is possible to obtain rough self-location information without using the GPS function.

  Therefore, the communication path for data transmission / reception can be suitably determined. That is, an effective route toward the target mobile terminal device can be selected.

  In addition, position information can be obtained even if the mobile terminal device is not in an environment where GPS can be used, and since it is not necessary to provide a GPS function in the mobile terminal device, the cost can be reduced and the structure can be simplified. .

  Furthermore, if the correction means for correcting the approximate position information obtained by the approximate position information calculation means to position information with higher accuracy is provided, position information with higher accuracy than the approximate position information can be obtained.

  Embodiments according to the present invention will be described below with reference to the drawings.

[First Embodiment]
In the first embodiment, an example will be described in which the mobile terminal device roughly calculates its own location information based on the location information of the base station and the number of hops from the base station.

  FIG. 1 is a schematic diagram showing a wireless communication system 1000 according to the present embodiment.

  As shown in FIG. 1, a wireless communication system 1000 according to the present embodiment includes a plurality of base stations 100 that can perform wireless communication using an ad hoc network method, and a plurality of mobile terminal devices 101 that can perform wireless communication using an ad hoc network method. , And is configured. In FIG. 1, for simplicity, only three base stations 100 are shown, for example, and these base stations are given separate reference numerals 1, 2, and 3 for convenience. Similarly, a separate reference numeral 110 is attached to the central mobile terminal device 101, and each mobile terminal device 101 that relays communication between the mobile terminal device 110 and each of the base stations 1 to 3 is also provided. Separate reference numerals 111, 112, 122, 122, 123, 131, 132, 133, and 134 are attached.

  FIG. 2 is a block diagram illustrating a configuration of the mobile terminal device 101.

  The mobile terminal device 101 is, for example, a mobile phone, PHS (Personal Handy Phone System), or PDA (Personal Digital Assistant), and can perform wireless communication with the base station 100 and other mobile terminal devices 101. It has become.

  For example, as illustrated in FIG. 2, the mobile terminal device 101 includes a wireless unit 10 that performs wireless communication, an operation unit 20 that is operated by a user (for example, a plurality of operation keys), and a display that performs a display operation. The unit 30 (for example, composed of a liquid crystal display device), the control unit 40 for performing various control operations, and the battery unit 50 (for example, composed of a rechargeable and detachable secondary battery) as a power source, perform sound generation operations. A sound generating unit 60 (speaker) and a receiving unit 70 (microphone) that performs a receiving operation are provided.

  Among them, the radio unit 10 includes an antenna 10A, receives a radio signal from the base station 100 or another portable terminal device 101 by the antenna 10A, and demodulates the received radio signal. The output signal from the radio unit 10 demodulated in this way is input to the control unit 40.

  Based on the output signal from the radio unit 10, for example, the control unit 40 causes the sound generation unit 60 to perform a sound generation operation (a sound generation operation such as a ringtone or the voice of the other party during a call) or position information. Various processes (to be described later) related to the calculation of.

  Further, the radio unit 10 modulates the audio signal from the control unit 40 (generated based on the audio input from the receiver unit 70) and the control signal from the control unit 40, converts the signal into a radio signal, and converts the radio signal to the antenna. It is transmitted from 10A to the base station 100 and other portable terminal devices 101.

  The mobile terminal device 101 can perform communication functions such as calls, e-mail transmission / reception, and Internet connection by performing wireless communication through the wireless unit 10 as described above, and information necessary for calculating position information. Send and receive.

  The control unit 40 includes, for example, a CPU that performs various control operations in addition to the operation control of the sound generation unit 60, the radio unit 10, and the display unit 30, various control programs (programs) executed by the CPU, and each control program. Are provided with a ROM (recording medium) that stores various data necessary for execution of the CPU and a RAM that functions as a work area of the CPU. The operation of the control unit 40 described below is performed according to a control program stored in the ROM.

  The control unit 40 functions as an approximate position information calculation unit, a hop number recognition unit, and a hop number calculation unit, and the radio unit 10 includes a base station position information acquisition unit, a first notification unit, a notification information acquisition unit, and a second hop number calculation unit. It functions as a notification means. In the following description, the reception operation (acquisition operation) of information by the mobile terminal device 101 is performed by the wireless unit 10, and the information received by the wireless unit 10 is transmitted to the control unit 40. The control unit 40 of the portable terminal device 101 performs various processes (recognition process, calculation process, storage for storing information in the RAM of the control unit 40, etc.) using information from the radio unit 10. In addition, the information transmission operation (notification operation) by the mobile terminal device 101 is performed by the wireless unit 10 under the control of the control unit 40.

  In addition, each base station 100 transmits its own ID (identification information) and position information to each mobile terminal device 101 at predetermined time intervals (for example, periodically). It has become.

  When the mobile terminal apparatus 101 receives (acquires) the ID and position information transmitted from the base station 100, the mobile terminal apparatus 101 stores and holds the ID and position information (in the RAM of the control unit 40).

  Here, when the mobile terminal device 101 directly receives the ID and position information transmitted from any of the base stations 100 (without passing through the other mobile terminal device 101), the base station It can be recognized (in the control unit 40) that the number of hops from 100 is “1”.

  The mobile terminal device 101 also stores and holds the number of hops recognized in this way together with the corresponding ID and position information.

  The number of hops is a number indicating how many stages of communication the ID and position information have been transmitted from the base station 100, and is represented by “the number of mobile terminal devices 101 that pass through + 1”.

  In addition, the mobile terminal device 101 that has received the ID and position information transmitted from the base station 100 in this way, the received (acquired) ID and position information, and the number of hops from the base station 100 (that is, Information indicating “1”) is transmitted (notified) to the other mobile terminal device 101.

  Further, the mobile terminal device 101 that has received the ID and position information of any base station 100 and the hop count information of the other mobile terminal device 101 from the base station 100 from the other mobile terminal device 101. Stores and holds the information (in the RAM of the control unit 40).

  Further, the mobile terminal device 101 (the control unit 40) calculates the number of hops of the mobile terminal device 101 based on the hop number information of the other mobile terminal device 101 transmitted from the other mobile terminal device 101. That is, by adding “1” to the number of hops indicated by the information on the number of hops transmitted from other portable terminal devices 101, the number of hops of the subject can be calculated and recognized. Further, the information on the number of hops calculated in this way is also stored and held together with the corresponding ID and position information.

  Thus, each mobile terminal device 101 acquires position information of any base station 100 directly from any base station 100 or indirectly via any other mobile terminal device 101. In addition to being able to store and hold, the number of hops from the base station 100 can be recognized or calculated and stored and held.

  Here, each mobile terminal apparatus 101 provides one set of information including the ID and position information of any base station 100 and the number of hops from the base station 100, for example, 3 at the maximum. It is assumed that up to a set (only corresponding to three base stations 100) is stored and held.

  Next, a more specific description will be given with reference to FIG.

  As described above, each mobile terminal device 101 calculates its own hop count by increasing the hop count notified from the other mobile terminal device 101 by “1”. As a result, every time the number of mobile terminal devices 101 that pass through increases, the number of hops notified to other mobile terminal devices 101 increases by one, so each mobile terminal device 101 accurately recognizes its own hop count. it can.

  Therefore, for example, in the state of FIG. 1, the central mobile terminal device 110 includes, for example, the ID and position information of the first base station 1, the second base station 2, and the third base station 3, The number of hops from each of the third base stations 1 to 3 is stored and held.

  That is, the central mobile terminal device 110 obtains the ID and location information of the first base station 1 from the first base station 1 by, for example, notification through the two mobile terminal devices 111 and 112 in this order. In addition, the mobile terminal device 110 recognizes by calculation that its own hop number n1 from the first base station 1 is “3”, and stores and holds the acquired or recognized information collectively. Yes.

  Similarly, the ID and position information of the second base station 2 are sent to the central mobile terminal device 110 from the second base station 2 by notification that has passed, for example, three mobile terminal devices 121, 122, and 123 in this order. And the mobile terminal device 110 recognizes by calculation that its own hop count n2 from the second base station 2 is “4”, and collects the acquired or recognized information together. I have a memory.

  Further, similarly, the central mobile terminal device 110 receives the notification from the third base station 3 through, for example, four mobile terminal devices 131, 132, 133, and 134 in this order. While acquiring the ID and position information, the mobile terminal device 110 recognizes by calculation that its own hop number n3 from the third base station 3 is “5”, and acquires or recognizes them. Information is stored and held together.

  That is, the mobile terminal device 110 includes, as information about the first base station 1, ID1 of the first base station 1, position information (coordinates = (x1, y1)) of the first base station 1, and the first base station 1. The number of hops n1 from the station 1 is stored and held, and as the information about the second base station 2, the ID2 of the second base station 2, the position information of the second base station 2 (coordinates = (x2, y2 )) And its own hop count n2 from the second base station 2, and as information on the third base station 3, ID3 of the third base station 3, and position information of the third base station 3 (Coordinate = (x3, y3)) and the number of own hops n3 from the third base station 3 are stored and held.

  Furthermore, the portable terminal device 101 (the control unit 40) uses the information acquired or recognized in this way to perform approximate calculation according to the following formulas (1) to (3) to obtain the approximate position information. (Coordinate = (x0, y0)) can be obtained.

(X1−x0) ² + (y1−y0) ² = (a × n1) ² (1)
(X2-x0) ² + (y2-y0) ² = (a × n2) ² (2)
(X3-x0) ² + (y3-y0) ² = (a × n3) ² (3)
Note that a in the equation can be deleted from the three equations.

  These equations (1) to (3) are based on the assumption that the distances between the mobile terminal devices 101 that perform communication in the ad hoc network system are equal (that is, a in the equation). This is for calculating the approximate position information (coordinates = (x0, y0)).

  That is, the expressions (1) to (3) indicate that the mobile terminal apparatuses 111 and 112 that relay the ID and position information of the first base station 1 to the central mobile terminal apparatus 110 are Are located at equal distance intervals on a straight line connecting the position of the mobile terminal device 110 and the central mobile terminal device 110, and the ID and position information of the second base station 2 are relayed to the central mobile terminal device 110. The mobile terminal devices 121, 122, and 123 are located at equal distance intervals on a straight line connecting the position of the second base station 2 and the position of the central mobile terminal device 110, and The mobile terminal devices 131, 132, 133, and 134 that relay ID and location information to the central mobile terminal device 110 are on a straight line connecting the position of the third base station 3 and the central mobile terminal device 110. Even distance between In and assumed to be located, it is used to calculate the approximate position information of the portable terminal device 110 (coordinate = (x0, y0)).

  In the above description, the calculation of the own approximate position information in the mobile terminal device 110 that cannot directly acquire the ID and the position information from each of the base stations 1 to 3 has been described. The same applies to the calculation in the mobile terminal device 101 (for example, the mobile terminal device 111) that directly acquires the ID and the position information from the mobile phone.

  According to the first embodiment as described above, in each mobile terminal device 101, the base station 100 acquired directly from any base station 100 or indirectly through another mobile terminal device 101. To perform calculations according to the simple calculation formulas (1) to (3) above using the ID and position information of the base station and information on the number of hops from the base station 100 that acquired the position information. Thus, the self approximate position information can be easily obtained.

  Therefore, it is possible to determine a communication path for data transmission / reception in the ad hoc network method without providing a GPS function. That is, an effective route toward the target mobile terminal device 101 can be selected by using the self approximate position information obtained by calculation.

  Further, position information can be obtained even if the mobile terminal device 101 is not in an environment where the GPS function can be used, and since the mobile terminal device 101 does not need to have the GPS function, the cost is reduced and the structure is simplified. be able to.

  Furthermore, in the case of the first embodiment, it is not necessary to perform a relatively complicated calculation using the SOM algorithm as described in the second embodiment to be described later. In comparison, the circuit configuration of the control unit 40 can be simplified.

  In the first embodiment described above, one set of information including the ID and position information of any base station 100 and the number of hops from the base station 100 is set to a maximum of three sets. Although the example in which the approximate position information is calculated using the above is described, the approximate position information may be calculated using four or more sets of information.

[Second Embodiment]
In the first embodiment, the mobile terminal device 101 uses the position information of the plurality of base stations 1, 2, and 3 and the number of hops from each base station, as described in (1) above. Although the example which calculates self approximate position information by computing according to the formula of (3) was explained, the computing formulas of (1) to (3) above are each for performing communication in an ad hoc network system. Assuming that the distances between the mobile terminal devices 101 are equal, the approximate location information (coordinates = (x0, y0)) of the mobile terminal device 110 is calculated. Usually, a certain amount of error occurs.

  Therefore, in the case of the present embodiment, for example, as described below, calculation for correcting the error of the approximate position information is performed using a SOM (Self-Organizing Map) algorithm.

  First, each mobile terminal device 101 vectorizes its own approximate position based on the approximate position information obtained in the manner of the first embodiment. For example, the position vector of the terminal (mobile terminal device 101) i is pi = (x0, y0).

  Then, the following procedure is performed.

  (A) The radio unit 10 of each mobile terminal device 101 transmits the vectorized approximate position of itself to all other mobile terminal devices 101 within the communication range under the control of the control unit 40.

  As a result, each mobile terminal device 101 (the wireless unit 10 thereof) acquires the approximate position information pij (j = 1, 2,..., Ni) of all other mobile terminal devices 101 within the communication range.

  The following processes (B) to (F) are performed by the control unit 40 of the mobile terminal device 101. That is, the control unit 40 functions as a correction unit.

  (B) The maximum distance that can be communicated between the mobile terminal devices 101 is r. That is, | pi-pij |> r.

  The position correction vector Vi for the terminal i is defined by the following equation (4), where pk (0 ≦ k ≦ Ki) is the position vector of the mobile terminal device 101.

（Ｃ）また、端末ｉは、ｍ回目の学習ステップにおいてｐｉｋを以下の（５）式及び（６）式に従って更新する。

(C) Further, the terminal i updates pik in accordance with the following equations (5) and (6) in the m-th learning step.

Δik = (b (m) × (pi−pik)) / Fi (5)
pik ← pik + {Δik + q (m) | Δik | × Vi / | Vi | (6)
Here, b (m) and q (m) are functions relating to the SOM learning step m, and can be expressed by the following equations (7) and (8), where T is the total number of learning steps.

b (m) = exp (− (m + 1) / T) (7)
q (m) = 1 / (1 + exp ((uT−m) / vT)) (8)
Here, u and v are adjustment parameters.

  Further, Fi = Ni / Ki (where Ki ≠ 0) and Fi = Ni + 1 (where Ki = 0).

  (D) The terminal i transmits the position update data pij (j = 1, 2,..., Ni) to the terminal j within the communication range, and the terminal i updates the position data pji (j = 1) from its terminal j. , 2,..., Ni), and the average vector represented by the following equation (9) is updated as its own position.

（Ｅ）上記の手順（Ｂ）から手順（Ｄ）までをＴ回繰り返す。

(E) The above procedure (B) to procedure (D) are repeated T times.

  (F) The pi obtained in the procedure (E) is the position of the terminal i.

  According to the second embodiment as described above, by correcting the approximate position information obtained by the method of the first embodiment using a SOM (self-organizing map) algorithm, Since the approximate position information can be corrected to position information with higher accuracy, position information with higher accuracy than the approximate position information can be obtained.

It is a schematic diagram which shows the radio | wireless communications system which concerns on embodiment of this invention. It is a block diagram which shows the portable terminal device which concerns on embodiment of this invention.

Explanation of symbols

100 base station 101 portable terminal device 10 wireless unit (base station position information acquisition means, first notification means, notification information acquisition means, second notification means)
40 control unit (rough position information calculation means, correction means, hop number recognition means, hop number calculation means)
1000 Wireless communication system

Claims (11)

In mobile terminal devices capable of ad hoc network communication,
Comprising approximate position information calculating means for calculating the own approximate position information based on the position information of a plurality of base stations and the number of hops from each base station ;
When there is one or more other mobile terminal devices that relay and notify the location information of one base station to the mobile terminal device, each of the other mobile terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device. Mobile terminal device. Base station location information acquisition means for acquiring location information of the base station transmitted from the base station;
A hop number recognizing unit that recognizes the number of hops from the base station as "1" when the position information of the base station is acquired by the base station position information acquiring unit;
When the position information of the base station is acquired by the base station position information acquisition means, the acquired position information and information indicating the number of hops “1” from the base station are transmitted to another mobile terminal. First notification means for notifying the device;
Notification information acquisition means for acquiring position information of a base station notified from another mobile terminal device and information on the number of hops of the other mobile terminal device;
When information from another mobile terminal device is acquired by the notification information acquisition means, by adding “1” to the hop number indicated by the information on the hop number of the other mobile terminal device, A hop number calculating means for calculating the hop number;
When information from another portable terminal device is acquired by the notification information acquisition unit, the location information of the base station in the information and the number of hops calculated by the hop number calculation unit A second notification means for notifying the mobile terminal device;
With
The approximate position information calculating means includes
Position information of a plurality of base stations acquired by the notification information acquisition means and / or the base station position information acquisition means, and each calculated and / or recognized by the hop number calculation means and / or the hop number recognition means The mobile terminal device according to claim 1, wherein the approximate position information is calculated based on the number of hops from the base station. Correction means for making the approximate position information more accurate by correcting the approximate position information obtained by the approximate position information calculating means using a SOM (self-organizing map) algorithm. mobile terminal device according to claim 1 or 2, further comprising. In a wireless communication system including a plurality of mobile terminal devices capable of communication by an ad hoc network method and a plurality of base stations,
Each of the said portable terminal device is a portable terminal device as described in any one of Claims 1 thru | or 3 , The radio | wireless communications system characterized by the above-mentioned. 5. The wireless communication system according to claim 4 , wherein each of the base stations transmits its own ID and position information to the mobile terminal device every predetermined time. A method of calculating own approximate position information in a mobile terminal device capable of communication by an ad hoc network method,
The mobile terminal device includes a first calculation process for calculating own approximate position information based on position information of a plurality of base stations and the number of hops from each base station ,
In the first calculation process, when there is one or more other portable terminal devices that relay and notify the position information of one base station to the portable terminal device, each of the other portable terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device. Position information calculation method to be performed. A first acquisition process in which the mobile terminal device acquires position information of the base station transmitted from a base station;
A recognition process for recognizing the number of hops from the base station as “1” when the mobile terminal apparatus acquires the position information of the base station transmitted from the base station by the first acquisition process; ,
When the mobile terminal apparatus acquires the position information of the base station transmitted from the base station through the first acquisition process, the acquired position information and the number of hops from the base station are “1”. A first notification process for notifying other mobile terminal devices of information indicating
A second acquisition process in which the mobile terminal device acquires location information of a base station notified from another mobile terminal device and information on the number of hops of the other mobile terminal device;
When the mobile terminal device acquires information notified from another mobile terminal device through the second acquisition process, the hop number indicated by the information on the number of hops of the other mobile terminal device is included in the information. A second calculation process for calculating the number of hops by adding 1 ”;
When the mobile terminal device acquires information notified from another mobile terminal device by the second acquisition process, the base station position information of the information and the second calculation process are calculated. A second notification process of notifying other mobile terminal devices of the number of hops of the device;
With
In the first calculation process,
Position information of a plurality of base stations acquired by the first acquisition process and / or the second acquisition process, and each base station calculated and / or recognized by the second calculation process and / or the recognition process The position information calculation method according to claim 6 , wherein the approximate position information is calculated based on the number of hops from the self. The mobile terminal device corrects the approximate position information obtained by the first calculation process using a SOM (self-organizing map) algorithm, thereby making the approximate position information more accurate. position information calculating method according to claim 6 or 7, further comprising a correction step of the information. In a computer executable program,
First calculation processing for calculating approximate position information of a base station based on position information of a plurality of base stations and the number of hops from each base station in a mobile terminal device capable of communication using an ad hoc network method the execution,
In the first calculation process, when there is one or more other mobile terminal devices that relay and notify the location information of one base station to the mobile terminal device, each of the other mobile terminal devices The approximate position information is calculated according to an arithmetic expression that is assumed to be located at equal distance intervals on a straight line connecting the position of the one base station and the position of the mobile terminal device. Program to do. In the portable terminal device,
A first acquisition process for acquiring position information of the base station transmitted from the base station;
A recognition process for recognizing the number of hops from the base station as “1” when the position information of the base station transmitted from the base station is acquired by the first acquisition process;
When the position information of the base station transmitted from the base station is acquired by the first acquisition process, the acquired position information and information indicating the own hop number “1” from the base station, A first notification process for notifying another mobile terminal device;
Second acquisition processing for acquiring position information of a base station notified from another mobile terminal device and information on the number of hops of the other mobile terminal device;
When information notified from another mobile terminal device is acquired by the second acquisition process, by adding “1” to the hop number indicated by the information on the number of hops of the other mobile terminal device. A second calculation process for calculating the number of hops of the device;
When the information notified from the other mobile terminal device is acquired by the second acquisition process, among the information, the position information of the base station, the own hop number calculated by the second calculation process, A second notification process for notifying other mobile terminal devices;
Run
In the first calculation process,
Position information of a plurality of base stations acquired by the first acquisition process and / or the second acquisition process, and each base station calculated and / or recognized by the second calculation process and / or the recognition process The program according to claim 9 , wherein the approximate position information is calculated based on the number of hops from itself. A correction process for converting the approximate position information to more accurate position information by performing correction using the SOM (self-organizing map) algorithm on the approximate position information obtained by the first calculation process. The program according to claim 9 or 10 , further executed.

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