JP2004248051A - Data communication system, mobile terminal, and data communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise the degree of security of data communication between a mobile terminal mounted on a mobile and communication equipment installed outside the mobile. <P>SOLUTION: This data communication system has the mobile terminal 10 mounted on the mobile 1, and the communication equipment 25 installed outside the mobile and is capable of radio-communicating with the mobile terminal. An information processing apparatus 14 determines whether or not the mobile is at a predetermined communication location, on the basis of the position of the mobile measured by a position measuring apparatus 16. When the mobile is determined to be at the predetermined communication location, it becomes possible to perform data communication between the mobile terminal and the communication equipment. It is necessary to transfer the mobile to the predetermined communication location, to perform data communication. Accordingly, unauthorized data communication can be prevented by fixing a place such as a parking lot of its normal user's own house or the like, which persons other than the user are hard to enter, as the communication location. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to data communication between a mobile terminal and a communication device.
[0002]
[Prior art]
In recent years, technology for performing communication between a mobile terminal mounted on a vehicle and a communication device installed outside the vehicle has been developed. As an example of such a technology, a car navigation device that receives schedule data from an external communication device and calculates a departure time according to the schedule data is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-296133 A
[0004]
[Problems to be solved by the invention]
When communication between a mobile terminal in a vehicle and a communication device outside the vehicle is performed by a wireless communication method such as a wireless local area network (hereinafter, referred to as “wireless LAN”), security is important. In a wireless communication system in which mutual authentication between a mobile terminal and a communication device is performed based on a specific digital code only, if a malicious person obtains the digital code, important data is transmitted. It is relatively easy to steal from a device or send unintended data to a communication device.
[0005]
Therefore, an object of the present invention is to enhance the security of data communication between a mobile terminal mounted on a mobile object and a communication device installed outside the mobile object.
[0006]
[Means for Solving the Problems]
A data communication system according to the present invention includes a mobile terminal mounted on a mobile body, a communication device installed outside the mobile body and capable of communicating with the mobile terminal, and a position measurement for measuring a position of the mobile body. The apparatus determines whether or not the mobile object is at a predetermined communication position based on the position of the mobile object measured by the position measurement device. A control device that enables data communication between the terminal and the communication device.
[0007]
In the data communication system of the present invention, data communication cannot be performed between the mobile terminal and the communication device unless it is determined that the mobile is at the predetermined communication position. Therefore, a person who intends to perform data communication needs to carry the mobile to a predetermined communication position. For this reason, if the communication position is set to a place where a person other than the authorized user is hard to enter, a place that is easily visible, a place where a surveillance camera is installed, or the like, illegal data communication can be prevented. In particular, when data communication is performed by a wireless method, the communication position is necessarily set near the installation location of the communication device. Since the communication device is usually installed in a place where an authorized user enters and exits, it is difficult to perform unauthorized data communication in the vicinity.
[0008]
The mobile terminal may operate as the control device described above. In this case, the mobile terminal stores the communication position, obtains the current position of the mobile from the position measurement device, compares the current position of the mobile with the communication position, and determines whether the mobile has the communication position. And a step of judging whether or not there is. When the mobile terminal determines that the mobile is at the communication position, data is communicated between the mobile terminal and the communication device. Since the mobile terminal also serves as the control device, the configuration of the data communication system is simplified.
[0009]
When the mobile terminal determines that the mobile is at the communication position, the mobile terminal may transmit a communication request to the communication device. The communication device may execute authentication processing of the mobile terminal in response to the communication request. When the authentication of the mobile terminal is successful in the authentication process, data is communicated between the mobile terminal and the communication device. Since the authentication of the communication device determines whether or not data communication is possible, in addition to the position of the mobile body, unauthorized data communication is more reliably prevented. Unless it is determined that the mobile is at the communication position, no communication is requested for the communication device, so that useless communication is omitted.
[0010]
The communication device may operate as the control device described above. In this case, the communication device stores the communication position, obtains the current position of the moving object from the position measurement device, compares the current position of the moving object with the communication position, and sets the moving object to the communication position. And a step of determining whether or not there is any data. When the communication device determines that the mobile is at the communication position, data is communicated between the mobile terminal and the communication device. Since the communication device also serves as the control device, the configuration of the data communication system is simplified.
[0011]
The communication device may execute authentication processing of the mobile terminal in response to a communication request from the mobile terminal, and the communication device may operate as a control device. In this case, the communication device stores a collation code and a communication position registered in advance, a step of receiving an authentication code from a mobile terminal, and a step of obtaining a current position of the mobile from a position measurement device. Certifying the mobile terminal when the authentication code matches the collation code and determining that the mobile is at the communication position. When the authentication is given to the mobile terminal, data is communicated between the mobile terminal and the communication device. Since the mobile terminal is required to be at the communication position as a condition for authentication of the mobile terminal, if the communication position is appropriately set, unauthorized data communication is prevented. Further, since the communication device also serves as the control device, the configuration of the data communication system is simplified.
[0012]
The moving object may be a vehicle, for example, an automobile. The communication position may be a parking position determined for the vehicle. The control device may determine whether or not the moving body is at the communication position when the ignition switch of the vehicle is switched on and / or off.
[0013]
The position measurement device may be a GPS device that measures the position of the moving object using the GPS. For example, a GPS device of a car navigation system mounted on an automobile may be used as a position measurement device. In this case, there is no need to prepare a new position measuring device, so that the data communication system of the present invention can be easily realized.
[0014]
A mobile terminal according to the present invention is used by being mounted on a mobile in a data communication system including a communication device installed outside the mobile and a position measuring device for measuring the position of the mobile. The mobile terminal includes mobile communication means capable of communicating with a communication device, communication control means for controlling the mobile communication means, and storage means for storing a predetermined communication position. The communication control unit determines whether the mobile unit is at the communication position by comparing the position of the mobile unit with the communication position stored in the storage unit and obtaining the position of the mobile unit from the position measurement device. Executing a step and transmitting a communication request to a communication device by controlling the mobile communication means when it is determined that the mobile is at the communication position.
[0015]
The mobile terminal of the present invention can perform data communication between the mobile terminal and the communication device only when it is determined that the mobile is at a predetermined communication position. Therefore, a person who intends to perform data communication needs to carry the mobile to a predetermined communication position. Therefore, if the communication position is appropriately set, unauthorized data communication is prevented. Unless it is determined that the mobile is at the communication position, no communication is requested for the communication device, so that useless communication is omitted.
[0016]
The communication device may execute authentication processing of the mobile terminal in response to the communication request, and may send an authentication notification when authentication of the mobile terminal is successful. In this case, when the mobile communication unit receives the authentication notification, the communication control unit controls the mobile communication unit to communicate data with the communication device. Since the authentication of the communication device determines whether or not data communication is possible, in addition to the position of the mobile body, unauthorized data communication is more reliably prevented.
[0017]
According to the data communication method of the present invention, data is communicated between a mobile terminal mounted on a mobile object and a communication device installed outside the mobile object. The method includes measuring a position of a mobile, determining whether the mobile is at a predetermined communication position based on the measured position of the mobile, and determining whether the mobile is at a communication position. Enabling data communication between the mobile terminal and the communication device.
[0018]
Data communication can be performed between the mobile terminal and the communication device only when the mobile is at a predetermined communication position. Therefore, a person who intends to perform data communication needs to carry the mobile to a predetermined communication position. Therefore, if the communication position is appropriately set, unauthorized data communication is prevented.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the background and outline of the present embodiment will be described. The present embodiment relates to a technology for communicating data between a mobile terminal mounted on a mobile body and a communication device installed outside the mobile body. A vehicle such as an automobile is mainly assumed as the moving body. Computers installed in buildings such as homes and offices are mainly assumed as communication devices. However, these are only examples. Communication between the mobile terminal and the communication device is performed by a wireless communication method such as a wireless local area network (hereinafter, referred to as “wireless LAN”). In wireless communication, communication is possible only within a relatively short distance range (for example, 100 m or less).
[0020]
Data communication is performed after confirming the communication partner using authentication data or the like. In this data communication, data stored in a communication device outside the vehicle is transferred to a terminal inside the vehicle, or data stored in a terminal inside the vehicle is transferred to a communication device outside the vehicle. Specifically, important data such as travel route guidance data for a car navigation device, pay data such as music and video, and travel records can be mutually communicated between a terminal inside the vehicle and a communication device outside the vehicle.
[0021]
However, if the authentication between the mobile terminal and the communication device is performed only with a specific digital code, there is not enough risk that important data can be stolen or unintended data sent by a malicious person. is there. For example, the communication device and the mobile terminal are set so that when the ignition switch is turned off after the vehicle is parked, the communication device in the office automatically transmits data to the mobile terminal in the vehicle. And It is assumed that a malicious person knows the authentication code by eavesdropping or leakage without knowing the authorized user. The other person enters his / her authentication code into a terminal in his / her vehicle, parks his / her vehicle in a communicable area from the authorized user's office, and turns off the ignition switch, so that his / her own device can be accessed from the authorized user's communication device. Data can be transferred to a terminal in the vehicle. As described above, there is a possibility that another person who has obtained the authentication code may steal or alter the data.
[0022]
Thus, the inventor has conceived of using the position information of the mobile body as authentication information other than the digital code, thereby improving the security of data communication. Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. In the description of the accompanying drawings, the same elements will be denoted by the same reference symbols, without redundant description.
[0023]
FIG. 1 is a schematic diagram showing the configuration of the data communication system of the present embodiment. This data communication system has a mobile terminal 10 mounted on a mobile 1 and a communication device 25 installed in a user's home 2. In the present embodiment, the moving object 1 is an automobile owned by the user. The communication device 25 includes a home server 20. A wireless LAN base station 22 is connected to the home server 20. The mobile terminal 10 and the home server 20 construct a server-client type wireless local area network (hereinafter, referred to as “wireless LAN”). Therefore, the mobile terminal 10 and the home server 20 can communicate data bidirectionally. The mobile terminal 10 transmits and receives radio signals via the antenna 13. Home server 20 transmits and receives radio signals via antenna 24 of wireless LAN base station 22. At the time of communication, the mobile unit 1 is parked in a parking lot near the home 2. Communication by wireless LAN is usually possible between two points having an interval of 100 m or less.
[0024]
The communication device 25 is one computer system having the home server 20 as a core. The home server 20 includes an input device and a display device. The home appliance 26 and the personal computer 28 installed in the home 2 have a wireless LAN device, and establish a wireless LAN with the home server 20. Therefore, it is possible to perform wireless data communication between the home server 20 and the home appliance 20 and the personal computer 28.
[0025]
A communication line 30 is connected to the home server 20. The home server 20 can be connected to the Internet 40 via the communication line 30. Examples of the communication line 30 include a dedicated line, ADSL, FTTH, and CATV. The home electric appliance 26 and the personal computer 28 can be connected to the Internet 40 via a wireless LAN established between the home appliance 20 and the home server 20.
[0026]
As will be described later, the mobile terminal 10 includes a GPS receiver. The mobile terminal 10 can measure the position of the mobile 1 by receiving a GPS signal from a GPS satellite 50 using a GPS receiver.
[0027]
Hereinafter, the data communication system of the present embodiment will be described in more detail with reference to FIG. FIG. 2 is a block diagram showing a configuration of the data communication system. The mobile terminal 10 includes an in-vehicle wireless communication device 12, an in-vehicle information processing device 14, and an in-vehicle GPS receiver 16. The information processing device 14 is a computer including a CPU (not shown) and a storage device 15. The storage device 15 stores a program for controlling the operation of the information processing device 14. The operation of the information processing device 14 described below follows this program. The information processing device 14 further includes an operation unit and a display unit (not shown). The information processing device 14 may also serve as a car navigation device. The driving power of the wireless communication device 12, the information processing device 14, and the GPS receiver 16 is supplied from a battery power source (not shown) of the mobile unit 1.
[0028]
The information processing device 14 is electrically connected to both the wireless communication device 12 and the GPS receiver 16. The information processing device 14 is a communication control unit that controls the operation of the wireless communication device 12. The wireless communication device 12 is provided with a wireless LAN antenna 13. A GPS antenna 17 is attached to the GPS receiver 16. The GPS receiver 16 receives a GPS signal from the GPS satellite 50 via the GPS antenna 17. This GPS signal is sent to the information processing device 14. The information processing device 14 calculates position data of the moving object 1 using the GPS signal. The position data includes latitude data and longitude data. Thus, the mobile terminal 10 has a function as a position measuring device that measures the position of the mobile 1.
[0029]
The home server 20 and the wireless LAN base station 22 constitute a communication device 25 installed in the house 2. As described above, the communication device 25 can perform wireless data communication with the mobile terminal 10.
[0030]
As described below, in the present embodiment, each of the mobile terminal 10 and the communication device 25 operates as a control device that determines whether data communication between the mobile terminal 10 and the communication device 25 is possible.
[0031]
In the present embodiment, when the user parks the mobile 1 and switches the ignition switch from on to off, the mobile terminal 10 automatically attempts data communication with the communication device 25. A parking position for communication is predetermined, and the position is hereinafter referred to as a “registered communication position”. For example, when the mobile unit 1 is actually parked at a communication position desired by the user and a button provided on the information processing device 14 is pressed, the current position of the mobile unit 1 is stored in the storage device 15 as a registered communication position. It may be as follows. The information processing device 14 calculates the current position of the moving object 1 using a GPS signal from the GPS receiver 16.
[0032]
Hereinafter, a data communication procedure between the mobile terminal 10 and the home server 20 will be described with reference to FIG. FIG. 3 is a flowchart showing this communication procedure.
[0033]
The mobile terminal 10 checks whether an ignition switch (indicated as “IG” in FIG. 3) has been switched from on to off (S302). When switching from on to off is detected (S302: YES route), the mobile terminal 10 determines whether or not the mobile 1 is at the registered communication position (S304). The registered communication position includes latitude data and longitude data, and is stored in the storage device 15 in the information processing device 14 in advance.
[0034]
In step S304, the information processing device 14 calculates the current position of the moving object 1 using the GPS signal from the GPS receiver 16. The information processing device 14 reads the registered communication position stored in the storage device 15 and compares the registered communication position with the calculated current position of the moving object 1. If the difference between the current position of the mobile unit 1 and the registered communication position exceeds a predetermined allowable difference, the information processing device 14 determines that the mobile unit 1 is not at the registered communication position (S304: NO route). This tolerance can be set arbitrarily.
[0035]
On the other hand, when the difference between the current position of the mobile unit 1 and the registered communication position is equal to or smaller than the predetermined allowable difference, the information processing device 14 determines that the mobile unit 1 is at the registered communication position (S304: YES route). In this case, the mobile terminal 10 transmits a communication request to the communication device 25 in the home 2 (S306). The communication request includes the authentication code of the mobile terminal 10 and the current position data of the mobile 1. The authentication code may be stored in the storage device 15 in advance, or may be input by the user when transmitting the communication request. After generating the communication request including the authentication code and the current position data, the information processing device 14 controls the wireless communication device 12 to transmit the communication request to the communication device 25. Thereafter, the mobile terminal 10 waits for a reply from the communication device 25.
[0036]
Upon receiving the communication request (S320), the communication device 25 executes authentication processing of the mobile terminal 10 (S322). In the authentication process, the home server 20 compares the authentication code included in the communication request with a collation code registered in advance, and determines whether the two match. The collation code is stored in a storage device (not shown) of the home server 20. Further, home server 20 compares the current position data included in the communication request with a predetermined registered communication position, and determines whether or not mobile unit 1 is at the registered communication position. The registered communication position is stored in the storage device of the home server 20 in advance.
[0037]
If the authentication code matches the verification code and the difference between the current position of the mobile unit 1 and the registered communication position is within a predetermined tolerance, the home server 20 determines that the authentication has been successful (S324: YES route). In this case, the home server 20 controls the base station 22 and transmits an authentication notification to the mobile terminal 10 (S326).
[0038]
On the other hand, if the authentication code does not match the verification code or if the difference between the current position of the mobile unit 1 and the registered communication position exceeds a predetermined tolerance, the home server 20 determines that the authentication has failed (S324: NO route). In this case, the home server 20 controls the base station 22 to transmit a non-authentication notification to the mobile terminal 10 (S328).
[0039]
When the mobile terminal 10 receives the authentication notification from the communication device 25 (S308: YES route), data communication is performed between the communication device 25 and the mobile terminal 10 (S310 and S330). The data transmitted is arbitrary. For example, an update program for the information processing device 14 may be transferred from the home server 20 to the mobile terminal 10. Further, the travel record of the mobile unit 1 may be transferred from the mobile terminal 10 to the home server 20.
[0040]
When determining that the data communication is completed (S312: YES route), the information processing device 14 ends the process. When determining that the data communication has been completed (S332: YES route), home server 20 ends the process.
[0041]
On the other hand, when the mobile terminal 10 receives the non-authentication notification from the communication device 25 (S308: NO route), data communication is not performed between the communication device 25 and the mobile terminal 10. The information processing device 14 displays a predetermined message and notifies the user that the authentication has failed (S314).
[0042]
Hereinafter, effects of the data communication system of the present embodiment will be described. The data communication system according to the present embodiment includes a security system using the position of the mobile unit 1 in addition to a conventional security system using an authentication code. That is, the mobile terminal 10 requests communication from the communication device 25 only when determining that the mobile 1 is at the predetermined registered communication position. For this reason, even if a person who is not an authorized user obtains the authentication code, in order to actually perform communication, the mobile must be carried to the registered communication position. Therefore, by properly setting the registered communication position, unauthorized data communication of another person can be prevented. In fact, in this embodiment, the registered communication position is a parking lot around the home of the authorized user, and it is difficult for others to park the car.
[0043]
In the present embodiment, also at the time of authentication of the mobile terminal 10 by the communication device 25, it is required that the current position of the mobile device 1 match the registered communication position stored in the communication device 25. Therefore, the security of data communication is higher. For example, even when the mobile unit 1 of the authorized user is stolen, if the registered communication position stored in the home server 20 is changed by operating the home server 20, an unauthorized use of the stolen mobile unit 1 can be performed. Data communication can be easily prevented.
[0044]
The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.
[0045]
In the above embodiment, the position of the parking lot around the home is used as the registered communication position. However, any position can be used as the registered communication position as long as it is within a communicable distance from the communication device 25. By registering a location that is difficult for others to access, a location that is easily visible, a location where a surveillance camera is installed, and the like as communication locations, it is easy to prevent unauthorized data communication.
[0046]
In the above embodiment, the communication device 25 to communicate with the mobile terminal 10 is installed in the home 2. However, the communication device may be installed in another place, for example, a user's office, a car store, or a store for paid content.
[0047]
In the above embodiment, both the mobile terminal 10 and the communication device 25 determine whether the mobile 1 is at the registered communication position. However, if this determination is made in at least one of the cases and whether or not data communication is permitted is determined according to the result, unauthorized data communication can be sufficiently prevented.
[0048]
In the above embodiment, each of the mobile terminal 10 and the communication device 25 operates as a control device that determines whether data communication is possible or not by comparing the current position of the mobile 1 with the registered communication position. However, the data communication system of the present invention may include such a control device separately from the mobile terminal 10 and the communication device 25. For example, an authentication device separate from the mobile terminal 10 and the communication device 25 is prepared, and the authentication device determines whether or not the mobile 1 is at the registered communication position, and permits data communication according to the determination result. Or it may be prohibited. However, there is an advantage that the configuration of the data communication system is simplified when the mobile terminal 10 and the communication device 25 also serve as a control device that determines whether or not data communication is possible.
[0049]
In the above embodiment, the position of the mobile unit 1 is measured using the GPS receiver mounted on the mobile unit 1. However, it is also possible to use other position measuring devices. For example, the position of the moving body 1 may be measured by a sensor installed around the registered communication position. However, if the GPS receiver of the car navigation system mounted on the moving body 1 is used as a position measuring device, there is no need to prepare a new position measuring device, so that there is an advantage that a data communication system can be easily realized. .
[0050]
In the above embodiment, the mobile terminal 10 determines whether or not the mobile 1 is at the registered communication position in response to switching of the ignition switch from on to off. However, this determination may be made in response to switching of the ignition switch from off to on, or in response to both switching from on to off and from off to on. For example, when the ignition switch is turned on, paid data such as music and video and travel route guidance data for a car navigation device may be automatically transferred from the communication device 25.
[0051]
The determination as to whether the mobile 1 is at the registered communication position may be made in response to another operation on the mobile 1. For example, the determination may be made when the gear is put into parking or the door is locked. In addition, the determination may be made in response to a user's operation other than the operation on the moving body 1. For example, the determination may be made when the shutter of the garage is closed.
[0052]
In the above embodiment, data communication between the mobile terminal 10 and the communication device 25 becomes possible only when the mobile 1 is at the registered communication position. However, the mobile terminal 10 may further have an operation mode in which data communication is possible even when the mobile 1 is not at the registered communication position. The user can freely switch between a high security operation mode in which data communication is possible only at the registered communication position and a low security operation mode in which the communication position is not restricted. This enables more flexible operation of the data communication system.
[0053]
【The invention's effect】
The present invention enables data communication between a mobile terminal and a communication device when it is determined that the mobile is at a predetermined communication position. For this reason, if the communication position is set to a place where a person other than the authorized user is hard to enter, a place that is easily noticed, a place where a surveillance camera is installed, or the like, illegal data communication can be prevented and security can be enhanced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a data communication system according to an embodiment.
FIG. 2 is a block diagram illustrating a configuration of a data communication system according to the embodiment.
FIG. 3 is a flowchart showing a data communication procedure between a mobile terminal and a home server.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mobile body, 2 ... Home, 10 ... Mobile terminal, 12 ... In-vehicle wireless communication device, 14 ... In-vehicle information processing device, 15 ... Storage device, 16 ... In-vehicle GPS receiver, 20 ... Home server, 22 ... Wireless LAN Base station, 25 communication device, 30 communication line, 40 Internet, 50 GPS satellite.

Claims (14)

A mobile terminal mounted on the mobile,
A communication device that is installed outside the moving object and can communicate with the mobile terminal,
A position measuring device for measuring the position of the moving body,
The mobile terminal determines whether or not the mobile is at a predetermined communication position based on the position of the mobile measured by the position measurement device, and determines that the mobile is at the communication position. A data communication system comprising: a control device that enables data communication between the communication device and the communication device. The data communication system according to claim 1, wherein the mobile terminal operates as the control device,
The mobile terminal,
Storing the communication location;
Acquiring the current position of the moving object from the position measurement device,
Comparing the current position of the moving object and the communication position to determine whether the moving object is at the communication position;
Run
The data communication system according to claim 1, wherein data is communicated between the mobile terminal and the communication device when the mobile terminal determines that the mobile is at the communication position. When the mobile terminal determines that the mobile is at the communication position, the mobile terminal transmits a communication request to the communication device,
The communication device executes an authentication process of the mobile terminal in response to the communication request,
The data communication system according to claim 2, wherein data is communicated between the mobile terminal and the communication device when the authentication of the mobile terminal is successful in the authentication processing. The data communication system according to claim 1, wherein the communication device operates as the control device,
The communication device,
Storing the communication location;
Acquiring the current position of the moving object from the position measurement device,
Comparing the current position of the moving object and the communication position to determine whether the moving object is at the communication position.
The data communication system according to claim 1, wherein data is communicated between the mobile terminal and the communication device when the communication device determines that the mobile object is at the communication position. The data communication system according to claim 1, wherein the communication device performs an authentication process of the mobile terminal in response to a communication request from the mobile terminal, and the communication device operates as the control device. ,
The communication device,
Storing a verification code and the communication position;
Receiving an authentication code from the mobile terminal;
Acquiring the current position of the moving object from the position measurement device,
When the authentication code matches the collation code, and when it is determined that the mobile is at the communication position, performing authentication to the mobile terminal.
The data communication system according to claim 1, wherein data is communicated between the mobile terminal and the communication device when authentication is given to the mobile terminal. The data communication system according to claim 1, wherein the moving body is a vehicle, and the communication position is a parking position determined for the vehicle. The data communication system according to claim 6, wherein the control device determines whether or not the moving object is at the communication position when an ignition switch of the vehicle is switched to at least one of on and off. . The data communication system according to any one of claims 1 to 7, wherein the position measurement device is a GPS device that measures the position of the moving object using a GPS. In a data communication system including a communication device installed outside the moving body and a position measuring device that measures the position of the moving body, a mobile terminal used by being mounted on the moving body,
Mobile communication means capable of communicating with the communication device,
Communication control means for controlling the mobile communication means,
Storage means for storing a predetermined communication position,
The communication control means,
Acquiring the position of the moving body from the position measurement device;
Comparing the position of the moving object with the communication position stored in the storage means to determine whether the moving object is at the communication position;
Transmitting a communication request to the communication device by controlling the mobile communication means when it is determined that the mobile is at the communication position. The communication device executes an authentication process of the mobile terminal in response to the communication request, and sends an authentication notification when authentication of the mobile terminal is successful,
The mobile terminal according to claim 9, wherein the communication control unit controls the mobile communication unit to communicate data with the communication device when the mobile communication unit receives the authentication notification. The mobile terminal according to claim 9, wherein the mobile body is a vehicle, and the communication position is a parking position determined for the vehicle. The mobile terminal according to claim 11, wherein the control device determines whether or not the mobile is at the communication position when an ignition switch of the vehicle is switched to at least one of on and off. . The mobile terminal according to any one of claims 9 to 12, wherein the position measuring device is a GPS device that measures the position of the mobile using GPS. A data communication method for communicating data between a mobile terminal mounted on a mobile body and a communication device installed outside the mobile body,
Measuring the position of the moving object;
Based on the measured position of the moving body, determining whether the moving body is at a predetermined communication position,
Enabling data communication between the mobile terminal and the communication device when it is determined that the mobile is at the communication position.

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