JP2014171101A - Narrow band communication on-vehicle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give notice of network non-connection only when a communication opposite party of its own on-vehicle device is a road-side device for Internet connection and cannot be connected.SOLUTION: Communication situation determination means 2c determines that communication is in a state in which the Internet cannot be connected when signal information determination means 2a determines that a received signal does not include information destined to its own on-vehicle device and when road-side device determination means 2b determines that a road-side device having transmitted the signal is a road-side device for Internet connection. When the communication situation determination means 2c has determined that communication is in the state in which the Internet cannot be connected, notification control means 2d makes a display unit 4 and a voice output unit 5 give notice of Internet non-connection to a user.

Description

  The present invention relates to a vehicle-mounted device for narrow area communication.

  In the Intelligent Transport System (ITS), in recent years, in road service areas and parking areas, roadside units (base stations) to vehicle-mounted devices (mobile stations) are able to communicate with short-range communications (DSRC). ) Internet connection service has been started. In this case, a dedicated parking lot is provided to receive the Internet connection service, and the user who wants to receive the Internet connection service places his / her vehicle in the dedicated parking lot and communicates with a roadside machine for Internet connection to receive the Internet connection service. .

  However, when in-vehicle devices for narrow area communication become widespread in the future, when there is a vehicle equipped with an on-vehicle device for narrow area communication that is stopped or passing in the communication area near the parking lot outside the dedicated parking lot, There is a concern that the roadside device and the vehicle-mounted device communicate with each other due to leaked radio waves from the roadside device for Internet connection. Due to such circumstances, if the roadside device is in communication with the upper limit number of roadside devices and the processing is over, the vehicle-mounted device of the vehicle (vehicle that wants to receive the Internet connection service) that has entered the dedicated parking lot May not be able to receive Internet connection services.

  In Patent Document 1, when a roadside device is already connected to the maximum number of vehicle-mounted devices that can communicate at one time and the vehicle-mounted device of the host vehicle cannot be connected, the result is reported.

Japanese Patent No. 4170180

  However, in the above-mentioned Patent Document 1, it is determined whether or not the vehicle-mounted device is individually communicable with the roadside device, but it is a roadside device for Internet connection or other roadside device (hereinafter referred to as “the roadside device”). It is not clearly determined whether it is another roadside machine), so if there is a similar processing over situation, whether the communication partner of the vehicle's on-board device is a roadside machine for Internet connection or not If the same processing is performed without confirming that the roadside device is other than the above, there is a risk that the Internet connection cannot be made even though it is a communication area of another service roadside device. For example, in a situation where the host vehicle is running on an expressway, there is a risk of notifying that the Internet connection is not possible even though a leaked radio wave from a roadside machine that is not for Internet connection is picked up.

  Therefore, the present invention provides an on-board device for narrow-area communication that can perform a notification related to a network disconnection only when the communication partner of the on-vehicle device is a roadside device for Internet connection and connection is impossible. With the goal.

  In the vehicle-mounted device for narrow area communication according to claim 1, the signal information determining unit determines whether or not the signal from the roadside device received by the signal receiving unit includes information for the vehicle-mounted device. Further, the roadside machine determination means determines whether the roadside machine that transmitted the signal is a roadside machine for Internet connection. Then, the communication status determination means determines that the signal information determination means does not include information for the vehicle-mounted device, and the roadside machine to which the roadside machine determination means transmits the signal is connected to the Internet. When it is determined that the vehicle is a roadside machine for communication, it is determined that the communication is not connected to the Internet. When the communication status determining means determines that the Internet is not connected, the notification control means causes the notification means to notify the user about the Internet disconnection.

  When the roadside device sends a signal, the OBE that has received this signal sends its own device-specific information (private link address, etc.) to the roadside device, and thereafter the roadside device exceeds the allowable number of OBE-specific information received. If not, the in-vehicle device specific information is taken in and downlink information for designating the on-vehicle device is transmitted. In the vehicle-mounted device, when there is information (information for the vehicle-mounted device) specifying the vehicle-mounted device, uplink information is transmitted to the roadside device.

  According to the above configuration, if the roadside device that communicated with the vehicle-mounted device is a roadside device for network connection, it can be seen that the signal received by the vehicle-mounted device is a signal for the Internet connection service. If the signal does not contain information for the vehicle-mounted device, the number of other vehicle-mounted devices communicating with the roadside device has reached the specified upper limit, that is, the roadside device is over processing capacity. It turns out that Internet communication is not connected. As a result, only when the communication partner of the vehicle-mounted device is a roadside device for Internet connection and connection is not possible, notification regarding the Internet disconnection can be performed.

  In the vehicle-mounted device for narrow area communication according to claim 2, the signal information determining means includes information for the vehicle-mounted device in the link address field of the FCMC (Frame Control Message Channel) included in the signal transmitted from the roadside device. It is determined whether or not a private link address for the vehicle-mounted device is included. According to this, since the presence / absence of information for the vehicle-mounted device is determined using the FCMC included in the signal transmitted from the roadside device, the presence / absence of the information for the vehicle-mounted device can be determined easily and reliably.

  The on-vehicle device for narrow area communication according to claim 3, wherein the signal information determining means determines whether or not information for the on-vehicle device is included in an FCMC link address field included in a signal transmitted from the roadside device. In addition, it is determined whether there is a broadcast link address in the FCMC link address field, and further, it is determined whether there is a group broadcast link address in the FCMC link address field. The communication status determination means determines that the determination result by the signal information determination means indicates that the signal does not include information for the vehicle-mounted device, does not include the broadcast link address, and the group broadcast link address. If the determination result by the roadside device determination means is a determination result that the roadside device that transmitted the signal is a roadside device for Internet connection, communication is not in the Internet connection state. Judge that there is.

According to this, it is possible to determine whether or not the communication is in the Internet disconnected state with higher accuracy.
According to a fourth aspect of the present invention, the roadside device that has transmitted the signal when the roadside device determination means satisfies at least one of the following conditions (a) to (d): Judged as a roadside machine for connection.
(A) The vehicle position information can be acquired, and the vehicle position based on the vehicle position information is a place where a roadside device for Internet connection exists.
(B) It is possible to acquire vehicle speed information and parking / braking operation information, the vehicle speed information is zero, and the parking / braking operation information is braking.

(C) There is no simultaneous broadcast link address and group broadcast link address in the FCMC link address field included in the signal transmitted from the roadside device.
(D) The signal for the other vehicle transmitted from the roadside device is monitored, and the signal for the other vehicle is transmitted to the communication specific to the Internet connection service (for example, PPPPCP in the ASL-NCP identification information defined by ARIB-STD-T88). Is set).
In the above configuration, if any one or more of the conditions (a) to (d) is satisfied, it can be accurately determined that the roadside device that has transmitted the signal toward the vehicle is a roadside device for Internet connection. . If two or more of the above conditions are satisfied, the determination accuracy is further increased.

The block diagram of the functional structure by 1st Embodiment of this invention. A figure showing an example of the installation location of roadside equipment for Internet connection The figure for demonstrating roughly the signal which a roadside machine transmits Diagram for explaining the configuration of FCMC Flow chart showing the control contents of the control unit The flowchart which shows the contents of roadside machine judgment processing FIG. 6 equivalent view according to the second embodiment of the present invention. FIG. 5 equivalent diagram according to the third embodiment of the present invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of the narrow-range communication vehicle-mounted device 1 by functional blocks. The in-vehicle device 1 for narrow area communication is mounted on a vehicle, and includes a control unit 2, a wireless communication unit 3, a display unit 4, an audio output unit 5, a vehicle position detection unit 6, an operation unit 7, and a map data storage unit 8. It has. The control unit 2 can acquire vehicle information (vehicle speed information and parking brake operation information) from the vehicle.

The control unit 2 includes a CPU, a RAM, a ROM, an I / O bus, and the like. The control unit 2 controls the overall operation of the in-vehicle device 1 for narrow area communication, and also includes a signal information determination unit 2a and a roadside device by a software configuration. It has functions as a determination unit 2b, a communication status determination unit 2c, and a notification control unit 2d.
The wireless communication unit 3 corresponds to a signal receiving unit. The wireless communication unit 3 includes an antenna 3a, and can perform wireless communication with a roadside device 9I described later by DSRC (Dedicated Short Range Communications).

The display unit 4 corresponds to a notification unit, and is composed of a liquid crystal display, for example, and displays display information based on a display command from the control unit 2. The audio output unit 5 corresponds to a notification unit, and is configured from, for example, a speaker, and outputs audio corresponding to an audio output command from the control unit 2.
The own vehicle position detection unit 6 is a GPS receiver for GPS (Global Positioning System) that detects (positions) the position of the own vehicle based on a radio wave transmitted from an artificial satellite for GPS, and the rotational angular velocity of the own vehicle. It includes a gyro sensor to detect, a vehicle speed sensor and the like.

The control unit 2 acquires information (own vehicle position information) from the own vehicle position detection unit 6. Further, the control unit 2 can determine the vehicle position on the map from the map data created in the map data storage unit 8 and the vehicle position information.
The operation unit 7 includes several keys that can be operated by the user. The operation unit 7 may be a touch switch on the display surface of the display unit 4.
The map data storage unit 8 is composed of a recording medium such as a hard disk, DVD, or CD, for example, road data (shape, attribute, etc.), intersection data (lane, type of branch, etc.), various facilities (service area, parking area, etc.) Map data including the installation point of the roadside device 9I for Internet connection is stored.

In this embodiment, the roadside machine 9I is a roadside machine for Internet connection. The roadside device 9I is installed near a parking area E (see FIG. 2) for Internet connection service in a service area such as an expressway or a parking area.
Other roadside devices include those for ETC (registered trademark), VICS (registered trademark), and so-called highway radios, which are provided at predetermined locations. When referring to roadside equipment in general, it is called roadside equipment 9.

  Here, when the roadside device 9I transmits a signal, the vehicle-mounted device 1 that has received this signal transmits its own vehicle-mounted device specific information (such as a private link address) to the roadside device 9, and thereafter the roadside device 9I is unique to the vehicle-mounted device. If the upper limit number of information received is not exceeded, the in-vehicle device specific information is taken in and downlink information specifying the on-vehicle device 1 is transmitted. In the vehicle-mounted device 1, if there is information (information for the vehicle-mounted device) specifying the vehicle-mounted device 1, uplink information is transmitted to the roadside device.

  The data structure of one frame of a signal transmitted from the roadside device 9I to the on-vehicle device 1 for narrow area communication includes, for example, an FCMC 10 and a plurality of slots 11 as shown in FIG. An FCMC 10 is provided at the beginning of one frame of data. FIG. 4 shows the data structure of the FCMC 10 (according to the Radio Industries Association of Japan ARIB STD-T75). This FCMC 10 includes, for example, eight link address fields (hereinafter referred to as LID). When the first communication between the roadside device 9I and the narrow area communication vehicle-mounted device 1 is connected to this LID, the private link address of the narrow-area communication vehicle-mounted device 1 is stored in one of the LIDs, and the private link address Information specifying which slot is the downlink for the vehicle narrow-area communication OBE specified in, and which slot is used for downlink for the vehicle narrow-area communication OBE specified in Information to be incorporated. The eight LIDs are denoted by LID (1) to LID (8) from the first to the eighth.

  In addition, the FCMC LID in signals transmitted from other roadside units is a simultaneous broadcast link for the base station (roadside unit) to transmit data and the like to a plurality of mobile stations (onboard units) in a simultaneous broadcast type. There are a type in which an address is allocated and a type in which a group broadcast link address for a base station to transmit data or the like to a specific mobile station group is allocated. These base stations (roadside devices) are not roadside devices for Internet connection.

  FIG. 5 shows the control contents of the control unit 2 when the control unit 2 receives the FCMC. When the user turns on the key or switch for Internet connection in the operation unit 7 and the control unit 2 receives the FCMC, the control unit 2 automatically stores the FCMC LID as information for the vehicle-mounted device 1 in step S1. It is determined whether or not there is a private link address for the vehicle-mounted device 1 (signal information determination means 2a). If it is determined that there is a private link address for the vehicle-mounted device 1 ("YES"), the process proceeds to step S6, and the roadside device 9 (the roadside device 9I because there is a private link address in this case) and the vehicle-mounted device 1 Normal processing (normal Internet connection service processing) is performed.

  If “NO” in the step S1, the process proceeds to a step S2, and it is determined whether or not the roadside device 9 that has transmitted a signal to the vehicle-mounted device 1 is a roadside device 9I for Internet connection (roadside device). Determination means 2b). This determination processing is shown in FIG. 6 as a subroutine. In FIG. 6, the vehicle position information is acquired from the vehicle position detection unit 6 in step T1, and in step T2, it is determined whether or not the vehicle position is a place where a roadside device 9I for Internet connection exists. Here, if the vehicle A is located in the parking area E for internet connection service in FIG. 2, the parking area E is a place where the roadside device 9I for internet connection service is located nearby. Is determined to be where the roadside device 9I exists. In this case, the process proceeds to step T9, where it is determined that the roadside machine that transmitted the signal is the roadside machine 9I for Internet connection, and the process returns to the main routine of FIG.

  If “NO” in the step T2, the process shifts to a step T3 to acquire vehicle speed information and parking / braking brake operation information as vehicle information. In step T4, it is determined whether the vehicle speed is zero and the parking / braking brake is operating (the vehicle is parked or stopped). If it is determined that the vehicle speed is zero and the parking / braking brake is operating, the process proceeds to step T9, where it is determined that the roadside machine that has transmitted the signal is the roadside machine 9I for Internet connection. Return to the main routine.

  If "NO" is determined in the step T4, the process proceeds to a step T5, and it is determined whether or not there is neither a simultaneous broadcast link address nor a group broadcast link address in the LID of the FCMC. If it is determined that neither the broadcast link address nor the group broadcast link address is included in the LID of the FCMC, the process proceeds to step T9, and it is determined that the roadside device that transmitted the signal is the roadside device 9I for Internet connection. Then, the process returns to the main routine of FIG.

If “NO” is determined in the step T5, the process proceeds to a step T6 to monitor a signal for the other vehicle-mounted device transmitted from the roadside device, and the signal for the other vehicle-mounted device is transmitted to the Internet in the step T7. It is determined whether the signal is specific to the connection service. When it is determined that the signal for the other vehicle-mounted device is a signal specific to the Internet connection service, the process proceeds to step T9, where the roadside device that has transmitted the signal is determined to be the roadside device 9I for Internet connection. Return to 5 main routine.
If “NO” in step T 7, that is, if “NO” in any of steps T 2, T 4, T 5, and T 7, the process proceeds to step T 8, and the roadside device that transmitted the signal is connected to the Internet. It judges that it is not the roadside machine 9I, and returns to the main routine of FIG.

  When the process returns to the main routine of FIG. 5 through step T9 or step T8, the process proceeds to step S3, where the determination result of step S2 (determination result of step T8, step T9) indicates that the roadside device that transmitted the signal is connected to the Internet If it is “YES”, that is, if it is determined that there is no private link address for the vehicle in the LID and the roadside machine is the roadside machine 9I for Internet connection, Thus, it can be seen that the vehicle-mounted device 1 is in a situation where it can receive the Internet connection service from the roadside device 9I for Internet connection, but is not actually receiving the Internet connection service. That is, for example, in FIG. 2, the vehicle-mounted device of the vehicle B parked or stopped in addition to the parking area E for the Internet connection service or the vehicle-mounted device of the vehicle C moving in the service area is instantaneously connected to the roadside device 9I. Alternatively, the number of other vehicle-mounted devices communicating with the roadside device 9I for Internet connection reaches the prescribed upper limit number even though the vehicle is continuously in communication and the vehicle is in the parking area E. It can be seen that the roadside device 9I is over processing capacity and the Internet communication is not connected.

  In this case, the process proceeds to step S4, and it is determined that the communication is not connected to the Internet (communication status determination means 2c). That is, in this step S4, since this step S4 has undergone “NO” in step S1 and “YES” in step S3, the determination result by the signal information determination means 2a is added to the signal for the vehicle-mounted device 1. Communication is not connected to the Internet when no information is included and the determination result by the roadside device determination means 2b is a determination result that the roadside device 9 that has transmitted the signal is a roadside device 9I for Internet connection. Judged to be in a state.

  Thereafter, the process proceeds to step S5, and the display unit 4 and the audio output unit 5 are notified about the Internet disconnection, for example, “Please reconnect after a while” or “The current line is crowded. "Notice" (notification by display, notification by voice) is performed (notification control means 2d).

  If “NO” is determined in step S3, that is, if it is determined that the LID does not have a private link address for the vehicle-mounted device and the roadside device is not the roadside device 9I for Internet connection, the flow goes to step S6. The normal communication process determined in advance with another roadside machine is continued.

  In the embodiment described above, the signal information determination unit 2a in the control unit 2 determines whether or not the information from the roadside device 9 received by the wireless communication unit 3 includes information for the vehicle-mounted device 1. Further, the roadside machine determination means 2b determines whether or not the roadside machine 9 that transmitted the signal is a roadside machine 9I for Internet connection. The communication status determination unit 2c determines that the signal information determination unit 2a does not include information for the vehicle-mounted device 1 in the received signal, and the roadside unit determination unit 2b transmits the signal. When it is determined that the device 9 is the roadside device 9I for Internet connection, it is determined that the communication is not connected to the Internet. When the communication status determination unit 2c determines that the Internet is not connected, the notification control unit 2d causes the display unit 4 and the audio output unit 5 to notify the user about the Internet disconnection.

  According to such an embodiment, if the roadside device 9 that communicated with the vehicle-mounted device 1 is the roadside device 9I for network connection, the signal received by the vehicle-mounted device 1 is a signal for Internet connection service. If it is understood that the information for the vehicle-mounted device 1 is not included in the signal, the number of other vehicle-mounted devices communicating with the roadside device 9 has reached the prescribed upper limit number, In other words, it can be seen that the roadside machine is over processing capacity and the Internet communication is not connected. As a result, only when the communication partner of the vehicle-mounted device 1 is the roadside device 9I for Internet connection and connection is impossible, it is possible to make a notification regarding the Internet disconnection.

Note that any one of the display 4 and the audio output unit 5 may be used as the notification means.
In the above embodiment, the signal information determination unit 2a includes the private link address for the vehicle-mounted device 1 as the information for the vehicle-mounted device 1 in the LID of the FCMC included in the signal transmitted from the roadside device 9. To determine whether or not According to this, since the presence / absence of information for the vehicle-mounted device 1 is determined using the FCMC included in the signal transmitted from the roadside device 9, the presence / absence of the information for the vehicle-mounted device 1 is determined easily and reliably. it can.

Further, in the above embodiment, when the roadside device determination means 2b satisfies one or more of the following conditions (a) to (d), the roadside device 9 that has transmitted the signal is used for Internet connection. It is determined that the roadside machine 9I.
(A) The vehicle position information can be acquired, and the vehicle position based on the vehicle position information is a place where the roadside device 9I for Internet connection exists.
(B) It is possible to acquire vehicle speed information and parking / braking operation information, the vehicle speed information is zero, and the parking / braking operation information is braking.

(C) There is no simultaneous broadcast link address or group broadcast link address in the LMC FCID included in the signal transmitted from the roadside device 9.
(D) The signal for the other vehicle transmitted from the roadside device 9 is monitored, and the signal for the other vehicle is communication peculiar to the Internet connection service.

  According to this, if the vehicle on which the vehicle-mounted device 1 for narrow area communication is mounted is in a place where the road-side device 9I for Internet connection exists, the road-side device 9 that is the source of the signal received by the vehicle-mounted device 1 is It can be determined that the roadside device 9I is for Internet connection. Further, when a signal from the roadside device 9 is received when the vehicle's state is vehicle speed information zero and the parking / braking brake operation information is braking, the roadside device 9 is connected to the Internet. It can be determined that the roadside machine 9I. Further, if the FCMC LID included in the signal received by the vehicle-mounted device 1 does not have a simultaneous broadcast link address and a group broadcast link address, it can be determined that this signal is a signal for the Internet. The roadside device 9 that is the transmission source can be determined to be the roadside device 9I for Internet connection. If the signal for the other vehicle transmitted from the roadside device 9 is monitored and the signal for the other vehicle is communication peculiar to the Internet connection service, the roadside device 9 is the roadside device 9I for Internet connection. I can judge.

Therefore, in the above configuration, if any one or more of the conditions (a) to (d) is satisfied, it is accurately determined that the roadside device that has transmitted the signal toward the vehicle is a roadside device for Internet connection. it can.
Moreover, in the said embodiment, the judgment order of the roadside machine judgment means 2b was made into the order of said (a), (b), (c), (d). According to this, it is possible to quickly obtain a determination result that the roadside device is for Internet connection.

  FIG. 7 shows a second embodiment. In this second embodiment, when the roadside machine determination means 2b satisfies any two or more of the conditions (a) to (d), the signal is output. It is determined that the transmitted roadside device 9 is a roadside device 9I for Internet connection. Specifically, step Ta to step Te are provided as shown.

  If “YES” in the step T2, the process proceeds to a step Ta following the “YES”, and in this step Ta, the fact that the condition (a) is satisfied is stored in the storage means, for example, the RAM, and the process returns to the step T3. Transition. If “YES” is determined in step T4 after this step T3, the fact that the condition (b) is satisfied in step Tb following this “YES” is stored, and the process proceeds to step T5.

If "YES" is determined in the step T5, it is stored in the step Tc following the "YES" that the condition (c) is satisfied, and the process proceeds to the step T6. If “YES” is determined in step T7 through step T6, the fact that the condition (d) is satisfied is stored in step Td following “YES”, and the process proceeds to step Te. In this step Te, it is determined whether or not two or more conditions are satisfied from the stored result. If two or more conditions are satisfied (if “YES”), the process proceeds to step T9. It is determined that the roadside device that transmitted the signal is the roadside device 9I for Internet connection.
According to the second embodiment, when any two or more of the conditions (a) to (d) are satisfied, the roadside device that has transmitted the signal is the roadside device 9I for Internet connection. Therefore, the determination accuracy by the roadside device determination means 2b is further increased.

Note that three or more conditions may be determined.
FIG. 8 shows a third embodiment of the present invention. In this third embodiment, the content of the signal information determination means 2a is different from that of the first embodiment. That is, step S1, step Sa, and step Sb in FIG. 5 correspond to the signal information determination unit 2a. In step S1, it is determined whether or not the information (private link address) for the vehicle-mounted device 1 is included in the FCMC LID included in the signal transmitted from the roadside unit. In step Sa, simultaneous broadcasting is performed on the FCMC LID. It is determined whether or not there is a link address. Further, in step Sb, it is determined whether or not there is a group broadcast link address in the LID of the FCMC.

In step S4 (communication status judging means 2c), this step S4 has undergone “NO” in step S1, “NO” in step Sa, “NO” in step Sb, and “YES” in step S3. The determination result by the signal information determination means 2a is a determination result that the signal does not include information for the vehicle-mounted device 1, does not have the simultaneous broadcast link address, and does not have the group broadcast link address. When the roadside machine determination means 2b determines that the roadside machine 9 that has transmitted the signal is a roadside machine 9I for Internet connection, it is determined that the communication is not connected to the Internet. .
According to the third embodiment, it can be determined with higher accuracy whether or not the communication is in the Internet disconnected state.

  In the drawings, 1 is an on-vehicle device for narrow area communication, 2 is a control unit, 2a is signal information determination means, 2b is roadside device determination means, 2c is communication status determination means, 2d is notification control means, 3 is a wireless communication unit ( (Signal receiving means), 4 is a display section (notification means), 5 is an audio output section (notification means), 6 is a vehicle position detection section, 9 is a roadside machine, and 9I is a roadside machine for Internet connection.

Claims (4)

A signal receiving means for receiving a signal transmitted from the roadside machine;
Signal information determining means for determining whether or not the information received by the signal receiving means includes information for the vehicle-mounted device;
Roadside machine determination means for determining whether the roadside machine that transmitted the signal is a roadside machine for Internet connection;
Notification means;
The signal information determining means determines that the received signal does not contain information for the vehicle-mounted device, and the roadside machine determining means transmits the signal is a roadside machine for Internet connection. A communication status determination means for determining that the communication is not connected to the Internet when determined;
An in-vehicle device for narrow area communication, comprising: a notification control unit that causes the notification unit to notify the user of the Internet disconnection when the communication state determination unit determines that the Internet is not connected.   The signal information determination means includes a private link address for the vehicle-mounted device as information for the vehicle-mounted device in the link address field of the FCMC (Frame Control Message Channel) included in the signal transmitted from the roadside device. The vehicle-mounted device for narrow area communication according to claim 1, wherein it is determined whether or not it is included. The signal information determination means determines whether or not information for the vehicle-mounted device is included in the FCMC link address field included in the signal transmitted from the roadside device, and in the FCMC link address field. It is determined whether there is a broadcast link address, and further, it is determined whether there is a group broadcast link address in the link address field of the FCMC,
The communication status determination means has a determination result by the signal information determination means that the signal does not include information for the vehicle-mounted device, does not have the broadcast link address, and does not have the group broadcast link address. And the determination result by the roadside device determination means is the determination result that the roadside device that transmitted the signal is a roadside device for Internet connection, the communication is not connected to the Internet. The in-vehicle device for narrow area communication according to claim 2, which is determined as follows. The roadside machine determination means determines that the roadside machine that transmitted the signal is a roadside machine for Internet connection when any one of the following conditions (a) to (d) is satisfied. The vehicle-mounted device for narrow area communication according to any one of 1 to 3.
(A) The vehicle position information can be acquired, and the vehicle position based on the vehicle position information is a place where a roadside device for Internet connection exists.
(B) It is possible to acquire vehicle speed information and parking / braking operation information, the vehicle speed information is zero, and the parking / braking operation information is braking.
(C) There is no simultaneous broadcast link address and group broadcast link address in the FCMC link address field included in the signal transmitted from the roadside device.
(D) The signal for the other vehicle transmitted from the roadside device is monitored, and the signal for the other vehicle is communication peculiar to the Internet connection service.

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