JP4784486B2 - Mobile terminal location system - Google Patents

Description

  The present invention relates to a mobile terminal position specifying system for specifying each position in a second mobile terminal located away from the first mobile terminal.

As a conventional system of this type, for example, a parking position specifying system is raised. In cooperation with a drive system such as a car, this detects a parking state, receives a beacon deployed in the parking lot, identifies the parking position, and records it in the information management server. Then, the response of the system that the user makes an inquiry to the server or the answer-back system of the locking / unlocking system that is pre-installed in the vehicle is detected by the sensor installed in the parking lot, the parking position in the parking lot is identified, Parking information could be displayed via a network (for example, refer to Patent Documents 1 and 2).
JP-A-2005-316771 JP 2005-339451 A

  However, in the above-described conventional configuration, in order for the user's mobile terminal (first mobile terminal) to inquire about the parking position of the car (second mobile terminal), it makes an inquiry to the data stored in the server, The parking position (position of the second portable terminal) is obtained via the network.

  Therefore, when accessing the server or network, it is necessary to make an inquiry based on personal information such as identification information. In order to use the parking position information specifying system described in the above document, the identification information is sent to the server or parking lot network system in advance. It is necessary to register personal information. In addition, personal information such as identification information may be stored in a server or a network due to the act of making an inquiry, which is not preferable in terms of security.

  In order to solve the above-described conventional problems, the mobile terminal position specifying system according to the present invention is configured such that when the user inquires about the position of the second mobile terminal, the user has the first mobile terminal and the second mobile terminal. The communication between the second portable terminal and the position information issuing terminal for specifying the position is a communication only for inquiring the position. That is, personal information such as identification information does not enter a server or network managed by a third party, and high security can be ensured.

  In the mobile terminal location specifying system of the present invention, the user operates the first mobile terminal, and the second mobile terminal and the location information issuing terminal are not connected via a network managed by a third party. Since the position can be specified, the position of the second portable terminal can be specified without worrying about information leakage.

1st invention is the portable terminal location specifying system comprised from the portable terminal, the vehicle-mounted terminal, and the positional-information issuing terminal, Parking in which the said vehicle-mounted terminal specifies the said portable terminal from the said portable terminal When the location request message is received, the in-vehicle terminal transmits a location information request message not including the terminal ID to the location information issue terminal, and the location information issue terminal that has received the location information request message The position information that is stored in the position storage unit and identifies the position of the in-vehicle terminal is read, the position information message including the position information is transmitted to the in-vehicle terminal, and the position information message is received. the vehicle terminal, the adding terminal ID for identifying the mobile terminal to the parking position message to the portable parking position message by the terminal ID is added to the position information message By and transmits with respect to end, it is possible to know the location of the vehicle terminal without being passed to the location information issuing terminal information specific to the mobile terminal.

2nd invention provides the alerting | reporting part in the said portable terminal, and when the said portable terminal receives the parking position telegram containing the positional information which pinpoints the position of the said vehicle-mounted terminal, the said alerting | reporting part is in the said parking position telegram. it is for displaying or audio output area the presence of the vehicle terminal based on the position information. According to this, the position of the in-vehicle terminal located away from the inside of the portable terminal is easily grasped by the portable terminal, or the position in the in-vehicle terminal located away from the inside of the portable terminal is obtained from the portable terminal. be able to.

According to a third aspect of the present invention, the portable terminal includes an operation unit capable of inputting information, and the position information request message transmitted from the portable terminal to the in-vehicle terminal includes the terminal ID for specifying the portable terminal and the in-vehicle terminal. And identification data which is information input from the operation unit . According to this, in order to obtain the position information in the in-vehicle terminal located away from the inside of the portable terminal, identification data is required, and the system is secured.

According to a fourth aspect of the present invention, the in- vehicle terminal includes a verification unit that determines whether or not the identification data included in the location information request message transmitted from the mobile terminal is registered in advance . Thus, the in-vehicle terminal is provided with a verification unit that determines whether or not the identification data included in the communication message transmitted from the mobile terminal is registered in advance. As a result, the identification data input from the portable terminal is collated, and the location of the in-vehicle terminal can be inquired only when it is registered.

According to a fifth aspect of the present invention, when there are a plurality of position information issuing terminals, the position information message including the position information specifying the position of the in-vehicle terminal issued from the position information issuing terminal includes the plurality of position information issuing terminals. It includes data indicating a positional relationship and data unique to the location information issuing terminal . Thereby, it is possible to know in what arrangement the position information issuing terminal is installed, and it is possible to obtain information for accurately estimating the location of the in-vehicle terminal at a remote location .

In a sixth aspect of the present invention, when the in-vehicle terminal receives a position information message including position information specifying the position of the in-vehicle terminal transmitted from a plurality of position information issuing terminals, the in-vehicle terminal indicates the position where the in-vehicle terminal exists. and it calculates the data and the position information indicating the positional relationship of the position information issuing terminal position information in the telegram. Thereby, the location of the in-vehicle terminal can be specified in consideration of the positional relationship where the location information issuing terminal is installed.

In a seventh aspect, when the in-vehicle terminal receives a position information message including position information specifying the position of the in-vehicle terminal transmitted from a plurality of position information issuing terminals, the in-vehicle terminal sets a plurality of positions where the in-vehicle terminal exists. it is to determine the field strength of the position information message including the positional information received. This makes it possible to accurately determine the location of the in-vehicle terminal at a remote location using a plurality of electric field strengths.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a parking position specifying system and a child position specifying system will be described as examples of the portable terminal position specifying system, but the present invention is not limited thereto.

(Embodiment 1)
FIG. 1 shows a system diagram of a parking position specifying system according to the first embodiment of the present invention. The parking position specifying system includes a mobile terminal 100 operated by a user, an in-vehicle terminal 200 attached to a vehicle such as a car, and a position information issuing terminal 300 that issues position information. Wireless communication is performed between the portable terminal 100, the in-vehicle terminal 200, and the position information issuing terminal 300.

  FIG. 2 is a block diagram showing internal configurations of the mobile terminal 100, the in-vehicle terminal 200, and the position information issuing terminal 300. The function of each block in the terminal will be described below.

  The portable terminal 100 transmits and receives a message between the operation unit 101 that is operated when acquiring position information of a vehicle such as a car, and the in-vehicle terminal 200 and the position information issuing terminal 300 according to the input of the operation unit 101. Mobile communication unit 102 and a notification unit 103 that notifies the received position information when the mobile communication unit 102 receives position information of a vehicle such as a car.

  The in-vehicle terminal 200 is provided in a vehicle such as a car, and includes an in-vehicle communication unit 201 that receives a message from the portable communication unit 102 in the portable terminal 100 and transmits a message to the position information issuing terminal 300. Yes.

  The position information issuing terminal 300 receives a message transmitted from the in-vehicle communication unit 201 in the in-vehicle information terminal 200, or transmits a message including position information to the mobile terminal 100, and a position information issuing unit 301 in advance A position information recording unit 302 that stores information is provided.

  The operation and action of each block will be described below. FIG. 3 illustrates a communication transition diagram performed between the components in the first embodiment.

  The portable terminal 100 is operated from the operation unit 101 when the user wants to know the position of a vehicle such as a car. When the operation unit 101 is operated, the terminal communication unit 102 transmits a parking position request message 600a for requesting the position information of the vehicle equipped with the in-vehicle terminal 200 to the in-vehicle terminal 200 provided in the vehicle or the like. In addition, since the parking position request message 600a includes the identification code of the in-vehicle communication unit, only the in-vehicle communication unit 201 on which the predetermined in-vehicle terminal 200 is mounted can perform the reception operation.

  In this reception operation, for example, carrier sense is performed at a predetermined interval, an identification code is received, and in the case of a corresponding identification number, a message part requesting position information is received. In the case of an identification number that does not correspond, the message part after the identification code takes a sequence that stops the reception operation.

  The identification code referred to here is data (terminal ID) uniquely assigned to the mobile terminal 100, and is used to distinguish from other mobile terminals.

  Next, the in-vehicle communication unit 201 that has performed the reception operation transmits a position information request message 600b of a vehicle such as a car equipped with the in-vehicle terminal 200 to the position information issuing terminal 300. The position information request message 600b transmitted from the in-vehicle terminal 200 to the position information issuing terminal 300 does not include the identification code included in the parking position request message 600a transmitted from the portable terminal 100.

In the location information issuing terminal 300, the location information request message 600b is received by the location information issuing unit 301, the location information stored in advance in the location storage unit 302 is read, and the location information is received from the location information issuing unit 301. The position information telegram 600c including it is transmitted to the in-vehicle terminal 200.

  When the position information message 600c is received by the in-vehicle communication unit 201 of the in-vehicle terminal 200, a predetermined specific identification code is added, and the in-vehicle communication unit 201 sends the parking position message 600d including the parking position to the portable terminal 100. Send to.

  The transmitted parking position message 600 d is received by the terminal communication unit 102 of the mobile terminal 100. Since the parking position message 600d includes an identification code in addition to the position information issued by the position information issuing terminal 300, the portable communication unit 102 of the portable terminal 100 matching the corresponding identification field number receives the receiving operation. to go into.

  When the mobile communication unit 102 in the mobile terminal 100 receives a message including the corresponding identification code, the notification unit 103 notifies the position information of the vehicle such as a vehicle by notifying the position information included in the message. The user can know.

  Next, the position information of the position recording unit 302 in the position information issuing terminal 300 and the parking position of a vehicle or the like equipped with the in-vehicle terminal 200 will be described. FIG. 4 is a diagram showing a usage pattern of the present invention, and each element of FIG. 4 will be described. However, description of elements that have already been described and which have the same operation will be omitted.

  FIG. 4 shows an example in which the present invention is applied to a parking lot. The parking area 400 is divided into three areas 1, area 2, and area 3 (401, 402, 403). In each area, one location information issuing terminal 300a, 300b, 300c is assigned, and the location information in each location information terminal is assigned and stored with location information from area 1 to area 3. Has been.

  In FIG. 4, in order to obtain the parking area information of the vehicle equipped with the in-vehicle terminal 200 parked in the parking space 400, when the user inputs from the operation unit 101 of the portable terminal 100, A parking position request message 600a requesting an area is transmitted. And the vehicle-mounted communication part 201 in the vehicle-mounted terminal 200 which received the parking position request | requirement message | telegram 600a transmits the position information request | requirement message | telegram 600b toward a position information issuing terminal.

  Each position information issuing terminal has an electric field strength level that can be received, and the position information issuing terminal cannot receive a signal unless it is a predetermined value or more. For example, the position information issuing terminal 300a is set so that it can be received only by a telegram output from the in-vehicle terminal in the area 1 (401) in the parking space 400. Therefore, the location information request message 600b transmitted from the in-vehicle communication unit 201 in the in-vehicle terminal 200 parked in the area 2 can be received only by the location information issuing terminal 302b.

  When the location information request message 600b is received by the location information issuing terminal 302b, the location information “area 2 (402)” stored in the location information recording unit 302 is read, and the location information message 600c including the location information is read. The information is transmitted from the position information issuing unit 302 in the position information issuing terminal 302b to the in-vehicle terminal 200.

When the in-vehicle communication unit 201 in the in-vehicle terminal 200 receives the position information message 600c, a predetermined identification code is added and transmitted from the in-vehicle terminal 200 to the portable terminal 100 as a parking position message 600d. The notification unit 103 notifies the user of the position information “Area 2 (402)” received by the mobile communication unit 102.

From the above, it becomes possible to specify the position of a vehicle such as a car parked at a location where the user who has the mobile terminal 100 is away without using a network or a server.

(Embodiment 2)
FIG. 5 is an internal block diagram of each component in the parking position specifying system according to the second embodiment. In the configuration of FIG. 5, the description of the same components as those in FIG. 2 is omitted, and the other components are described below.

  The difference from FIG. 2 is that in the in-vehicle terminal 200 mounted on a vehicle such as a car, the communication control unit 202 for controlling the transmission specifications and reception specifications of the in-vehicle communication unit 201 and the issuance of position information received by the in-vehicle communication unit 201 A position calculation unit 203 is provided that calculates position information of a vehicle such as a car equipped with the in-vehicle terminal 200 based on the position information in the position information message 600c transmitted from the terminal 300.

  Here, as a method for calculating the position information of a vehicle such as a car on which the vehicle-mounted terminal 200 is mounted, for example, when a message including position information is transmitted from a plurality of position information issuing terminals 300 In addition to demodulating each message in the in-vehicle communication unit 201, the electric field intensity level is calculated and then input to the position calculation unit 203, and the one with the highest electric field intensity level is the in-vehicle terminal 200 and the position information issuing terminal. It can be determined that the distance to 300 is short. According to this, the position information is determined as a place where a vehicle such as a car on which the in-vehicle terminal 200 is mounted.

  In addition, in the parking space 400 where a plurality of location information issuing terminals 300-00, 300-02, 300-04, 300-13, 300-20, 300-40, 300-60 as shown in FIG. When the vehicle-mounted terminal 200 is mounted and a vehicle such as a car is parked, the position information of the vehicle-mounted terminal 200 is requested in more detail when the position information of the vehicle-mounted terminal 200 is requested from a location away from the parking space 400. Obtainable.

  In FIG. 6, when a parking position request message 600a is transmitted from the mobile terminal 100 to the in-vehicle terminal 200, the position information request message 600b is sent from the in-vehicle terminal 200 to an unspecified number of position information issuing terminals arranged in the parking area 400. Send. Then, the location information issuing terminal that has received the location information request message 600b transmits the location information message 600c to the in-vehicle terminal 200.

  At this time, the position information message 600c includes reference origin information of the parking space 400, end point information, position information of the position information issuing terminal, and the like. The in-vehicle communication unit 201 of the in-vehicle terminal 200 demodulates the position information message 600c, and obtains the electric field strength level. The in-vehicle terminal 200 processes the position information message 600c transmitted from a plurality of position information issuing terminals in the same manner and inputs the same to the position calculation unit 203.

  In the position calculation unit 203, when the position information telegram 600c having the highest electric field strength is accumulated and a plurality of electric field strength levels having the same strength are obtained, a vehicle such as a car on which the in-vehicle terminal 200 is mounted becomes a parking space 400. Where it exists. As shown in FIG. 6, when the level of electric field strength 3 is the highest, the position information issuing terminals 300-13, 300-20, and 300-40 maintain the electric field strength level 3 at 500-13, 500-20, 500. Therefore, it is calculated that there is a vehicle such as a car on which the in-vehicle terminal 200 is mounted in the vicinity of the intersection. The operation and action will be described in detail below.

  When the user wants to acquire the position information of a vehicle such as a car equipped with the in-vehicle terminal 200, the user requests the position information from the operation unit 101 of the portable terminal 100, and acquires the position information of the in-vehicle terminal 200 from the portable communication unit 102. The position information request message 600a, which is a request message to be transmitted, is transmitted to the in-vehicle communication unit 201 of the in-vehicle terminal 200.

  The in-vehicle communication unit 201 performs reception when the transmitted location information request message 600a includes a predetermined identification code. After the reception, the position information request message 600b is transmitted to an unspecified number of position information issuing terminals 300.

  At this time, the communication control unit 202 performs control to reduce the transmission output of the in-vehicle communication unit 201. Since it is only necessary to request the position information to the unspecified position information issuing terminal 300 for those in the vicinity of the in-vehicle terminal 200, the transmission output is lowered.

  Next, the location information issuing terminal 300 that has received this location information request message 600c, as described above, the location information of the location information issuing terminal 300 registered in advance in the location recording unit 302, the origin and end point of the parking space. Information is read out and transmitted from the position issuing unit 301 to the in-vehicle terminal 200 as a position information message 600c.

  In the in-vehicle terminal 200, as already described, the in-vehicle communication unit 201 demodulates the position information message 600c and outputs the electric field strength of the message 600c. Thereafter, the position information of the in-vehicle terminal 200 is calculated by the position calculation unit 203 based on these pieces of information.

  The calculated position information is transmitted from the in-vehicle communication unit 201 to the mobile terminal 100. At this time, the communication control unit 202 performs control to increase the transmission output of the in-vehicle communication unit 201 so that communication can be performed with the mobile terminal 100 far away from the in-vehicle terminal 200. The parking position information of a vehicle such as a car equipped with the in-vehicle terminal 200 received by the mobile communication unit 102 of the mobile terminal 100 is notified by the notification unit 103. The configuration of the notification unit 103 is specified by display, voice, vibration, or the like.

  As a result, even if a vehicle such as a car is parked at a location far away from the person holding the mobile terminal 100, the parking position can be specified without using a server or a network.

(Embodiment 3)
FIG. 7 is a block diagram of each element of the parking position specifying system according to the third embodiment. In the configuration of FIG. 6, the description of the same components as those in FIGS. 2 and 5 is omitted, and the other components will be described below.

  2 and 5 is different from FIG. 2 and FIG. 5 in that the mobile terminal 100 has a confirmation input unit 104, and the user operates the mobile terminal 100 when requesting position information of a vehicle such as a car equipped with the in-vehicle terminal 200. In addition to inputting a request for position information from the unit 101, the confirmation input unit 104 confirms whether or not the person who can make a request to the in-vehicle terminal 200. In addition, in the in-vehicle terminal 200, the information input from the confirmation input unit 104 in the portable terminal 100 is received by the in-vehicle communication unit 101 as the position information request or the identification code of the portable terminal 100 transmitted. Another difference is that it has a collation unit 204 that collates data stored in advance with information input from the confirmation input unit 104. Here, the confirmation input unit 104 inputs a terminal, an operation for inputting a number, a character, a symbol, or the like, or inputs an image of a face, a fingerprint, a part of the body, or transcribing a vein, an iris, or the like. Is.

  Next, the operation and action will be described. In the collation unit 204, if the information transmitted from the portable terminal 100 matches the information recorded in advance in the collation unit 204, the position information request message 600b that requests the position information. Is transmitted from the in-vehicle communication unit 201 to the position information issuing terminal 300, and when there is a mismatch, the information is transmitted from the in-vehicle communication unit 201 to the portable terminal 100. In the mobile terminal 100, the information is received by the mobile communication unit 101, and the notification unit 103 notifies the content prompting the user again that the authentication has failed. Further, when the authentication cannot be performed a plurality of times, the parking position specifying function from the portable terminal 100 is disabled.

  As described above, by adding the confirmation input unit 104 to the mobile terminal 100, it is possible to increase the security level by preventing a person who is not the owner of the mobile terminal 101 from confirming the parking position information. Note that a collation unit 204 that collates information input from the confirmation input unit 104 may exist in the mobile terminal 100.

(Embodiment 4)
In the first to third embodiments, the parking position specifying system has been described. In the present embodiment, the child position specifying system will be described as an application development thereof.

  FIG. 8 shows a system diagram of the child location specifying system in the present embodiment. The child location specifying system includes a mobile terminal 600 held by a guardian, a mobile terminal 700 held by a child, and a location information issuing terminal 300, which are connected by wireless communication.

  FIG. 9 is a block diagram illustrating the internal configuration of the mobile terminal 600, the mobile terminal 700, and the location information issuing terminal 300. The function of each block in the terminal will be described below.

  The portable terminal 600 transmits and receives a message between the portable terminal 700 and the position information issuing terminal 300 in accordance with an input from the operation unit 601 and the operation unit 601 that are operated when acquiring the position information of the portable terminal 700. When the mobile communication unit 602 and the mobile communication unit 602 receive location information of the mobile terminal 700, the mobile communication unit 602 includes a notification unit 603 that notifies the received location information. The mobile terminal 700 has the same configuration as the mobile terminal 600, the operation unit 601 corresponds to the operation unit 701, the mobile communication unit 602 corresponds to the mobile communication unit 702, and the notification unit 603 corresponds to the notification unit 703. The explanation is omitted.

  The operation and action of each block will be described below. FIG. 10 illustrates a transition diagram of communication performed between the components in the first embodiment.

  The portable terminal 600 is operated from the operation unit 601 when the user wants to know the position of the portable terminal 700. When the operation unit 601 is operated, a child position request message 800a requesting the position information of the portable terminal 700 is transmitted from the terminal communication unit 602 to the terminal communication unit 702. Note that since the child position request message 800a includes the identification code of the mobile communication unit 702, only the mobile terminal 700 equipped with a specific terminal communication unit 702 determined in advance can perform the reception operation.

  In this reception operation, for example, carrier sense is performed at a predetermined interval, an identification code is received, and in the case of a corresponding identification number, a message part requesting position information is received. In the case of an identification number that does not correspond, the message part after the identification code takes a sequence that stops the reception operation.

  The identification code referred to here is data (terminal ID) uniquely assigned to the mobile terminal 600 and is used to distinguish from other mobile terminals.

  Next, the mobile communication unit 702 that has performed the reception operation transmits the location information request message 800b of the mobile terminal 700 to the location information issuing terminal 300. The position information request message 800b transmitted from the portable terminal 700 to the position information issuing terminal 300 does not include the identification code included in the child position request message 800a transmitted from the portable terminal 600.

Then, in the location information issuing terminal 300, the location information request message 800b is received by the location information issuing unit 301, the location information stored in advance in the location storage unit 302 is read, and the location information is issued from the location information issuing unit 301. The position information message 800c is transmitted to the portable terminal 700.

  When the location information message 800c is received by the mobile communication unit 702 of the mobile terminal 700, a specific identification code determined in advance is added, and the child location message 800d including the location information is sent from the mobile communication unit 702 to the mobile terminal 600. Send to.

  The transmitted child location message 800d is received by the mobile communication unit 602 of the mobile terminal 600. Since the child position message 800d includes an identification code in addition to the position information issued by the position information issuing terminal 300, the mobile communication unit 602 of the mobile terminal 600 that matches the corresponding identification field number receives the receiving operation. to go into.

  When the mobile communication unit 602 in the mobile terminal 600 receives a message containing the corresponding identification code, the notification unit 603 notifies the user of the position of the child by notifying the position information included in the message. Can know.

  As described above, when a parent searches for a child's location via a network or a server via a mobile terminal, information specific to the mobile terminal held by the parent or the child is passed to the location information issuing terminal. Without knowing where the child is.

  As described above, in the present invention, the positional information issuing terminal inquires about the positional relationship with the second mobile terminal via the second mobile terminal located away from the first mobile terminal, and the second mobile terminal is inquired of the first mobile terminal. It is possible to transmit and display the position information of the mobile phone, so that the present invention can be applied to mobile terminals constituting various networks.

The block diagram of the parking position specific | specification system of 1st Embodiment Block diagram of each element in the first embodiment Communication transition diagram in the first embodiment Application diagram of the parking position specifying system in the first embodiment Block diagram of elements to write in the second embodiment Explanatory drawing of the parking position specific method in 2nd Embodiment. Block diagram of each element in the third embodiment The block diagram of the child position specific system of a 4th embodiment Block diagram of each element in the fourth embodiment Communication transition diagram in the fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Portable terminal 101 Operation part 102 Portable communication part 103 Notification part 104 Confirmation input part 200 In-vehicle terminal 201 In-vehicle communication part 202 Communication control part 203 Position calculating part 204 Collation part 300 Position information issuing terminal 301 Position information issuing part 302 Position recording part 400 Parking space 600, 700 Mobile terminal 601, 701 Operation unit 602, 602 Mobile communication unit 603, 603 Notification unit

Claims (7)

In a mobile terminal location system composed of a mobile terminal, an in-vehicle terminal, and a location information issuing terminal,
When the in-vehicle terminal receives a parking position request message including a terminal ID for identifying the portable terminal from the portable terminal, the in-vehicle terminal sends a position information request message not including the terminal ID to the position information issuing terminal. The position information issuing terminal that has transmitted to and received the position information request message is stored in the position storage unit, reads position information for specifying the position of the in- vehicle terminal, and includes the position information. The in-vehicle terminal that transmits the information message to the in-vehicle terminal and receives the position information message adds a terminal ID that identifies the portable terminal to the position information message to form a parking position message, and the terminal ID is A mobile terminal position specifying system, wherein the added parking position message is transmitted to the mobile terminal. A notification unit provided in the mobile terminal, when the mobile terminal that has received the parking position message containing location information specifying a location of said vehicle-mounted terminal, the notification unit based on the position information of the parking position within the message 2. The mobile terminal position specifying system according to claim 1, wherein an area where the in-vehicle terminal exists is displayed or output as a voice. The portable terminal includes an operation unit capable of inputting information,
The location information request message transmitted from the mobile terminal to the in-vehicle terminal further includes a terminal ID for specifying the mobile terminal, a unique number for specifying the in-vehicle terminal, and identification data that is information input from the operation unit. The mobile terminal position specifying system according to claim 2, further comprising: The mobile terminal according to claim 3, further comprising: a collation unit that determines whether or not identification data included in a location information request message transmitted from the mobile terminal is registered in advance in the in-vehicle terminal. Terminal location system. When there are a plurality of position information issuing terminals, the position information message including the position information specifying the position of the in-vehicle terminal issued from the position information issuing terminal is data indicating the positional relationship of the plurality of position information issuing terminals; And data specific to the location information issuing terminal.
The portable terminal location specifying system according to any one of -4. The vehicle terminal, when receiving the position information message including location information specifying a location of said vehicle terminal transmitted from a plurality of position information issuing terminal, wherein the present position of the vehicle terminal of the positional information in the message 6. The portable terminal position specifying system according to claim 5, wherein the position information is calculated from data indicating a positional relationship of a position information issuing terminal and the position information. The vehicle terminal, when receiving the position information message including location information specifying a location of said vehicle terminal transmitted from a plurality of position information issuing terminal, the positional information received plurality of existing position of the vehicle terminal The mobile terminal location specifying system according to any one of claims 1 to 6, wherein the location information is determined based on an electric field strength of the location information message.