JP5861294B2 - Communication tag for driving support and driving support system - Google Patents

Description

  The present invention relates to a driving support communication tag and a driving support system for notifying a vehicle of the presence of a detected mobile terminal when a mobile terminal is detected around a communication tag.

  As this type of conventional technology, for example, there is a technology described in Patent Document 1. In this technique, a pedestrian carries an approach warning device and a data carrier is attached to the vehicle. The approach warning device and the data carrier can communicate with each other by RFID (Radio Frequency IDentification). While the pedestrian is traveling on the road, the approach warning device carried by the pedestrian transmits an interrogation radio wave to a predetermined zone (range). When the vehicle enters this zone, the data carrier receives the interrogation radio wave and returns a response radio wave to the interrogation radio wave. The approach warning device receives this response radio wave, detects the approach of the vehicle, and notifies the pedestrian.

JP 2003-173499 A

  By the way, in the prior art as described above, wireless communication by RFID is performed between an approach warning device carried by a pedestrian and a vehicle. For this reason, even when the pedestrian carrying the approach warning device is far away from the vehicle, the presence of the pedestrian can be notified to the driver of the vehicle by wireless communication using RFID. However, there is a problem that a pedestrian who does not carry an approach warning device (hereinafter also referred to as a communication tag) cannot be notified to the driver by wireless communication.

  Therefore, the present invention has been made in view of such circumstances, and not only a pedestrian carrying a communication tag but also a pedestrian who does not carry a communication tag is notified to the driver. It is an object to provide a communication tag for driving support that can be notified.

In order to achieve the above object, the present invention comprises a portable terminal detection means and a second wireless communication means. The portable terminal detection unit detects a portable terminal that can communicate with the first wireless communication method. The communication tag detection means detects another communication tag having the same function as the communication tag via the first wireless communication means. The second wireless communication unit obtains the position information of the communication tag and the information related to the mobile terminal paired with the communication tag from the information related to the mobile terminal detected by the mobile terminal detection unit. Transmission is performed by the second wireless communication method having a longer communication distance than the communication method. When it is determined by the mobile terminal detection means that there is another mobile terminal that is not paired with the communication tag among the mobile terminals, and the communication tag detection means determines that there is no other communication tag The second wireless communication means also transmits information on the other portable terminal detected by the portable terminal detection means.

  According to the present invention, when a portable terminal capable of communicating with the first wireless communication method is detected around the communication tag, the presence of the portable terminal exists at a position far from the periphery of the communication tag. The vehicle can be notified by the second wireless communication method (for example, traveling at a position about several tens to several hundred meters away from the communication tag). The vehicle can know that a portable terminal exists around the communication tag based on the notified information.

It is a schematic diagram showing an example of composition of driving support system 100 concerning a 1st embodiment. 2 is a diagram illustrating a configuration example of a communication tag 10. FIG. 3 is a diagram illustrating a configuration example of a control unit 50. FIG. It is a flowchart which shows the process of the communication tag 10 which concerns on 1st Embodiment. It is a flowchart which shows the processing content of step (S) 15 of the communication tag 10 which concerns on 1st Embodiment. It is a flowchart which shows the processing content of step (S) 17 of the communication tag 10 which concerns on 1st Embodiment. It is a figure which shows an example of the positional relationship of the vehicle 3 and the pedestrian 1a. It is a figure which shows an example of transmission period Ts1 and Ts2 and reception period Tr1 and Tr2 of medium distance radio | wireless communication. FIG. 3 is a diagram illustrating an example of a monitor screen 7 mounted on a vehicle 3. 2 is a diagram illustrating an example of an HMI terminal 30. FIG. FIG. 2 is a schematic diagram showing a case where the same type tag 20 is present in the short-range wireless communication area of the communication tag 10 in the driving support system 100. It is a figure which shows the structural example of the control part 150 which concerns on 2nd Embodiment. It is a flowchart which shows the processing content of step (S) 15 of the communication tag 10 which concerns on 2nd Embodiment. The figure which shows an example of transmission period Ts1 and Ts4 and reception period Tr1 and Tr4 of medium distance wireless communication in the communication tag 10, and an example of transmission period Ts'4 and reception period Tr'4 of medium distance wireless communication in the same type tag 20 It is. It is a flowchart which shows the process of the communication tag 10 which concerns on 3rd Embodiment.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to the drawings.
(Constitution)
FIG. 1 is a schematic diagram illustrating a configuration example of a driving support system 100 according to the first embodiment. The driving support system 100 is a system for notifying the driver of the vehicle 3 of the presence of at least the pedestrian 1a carrying the communication tag 10. The driving support system 100 includes, for example, a communication tag 10, an HMI (Human Machine Interface) terminal 30 a paired with the communication tag 10 (that is, a connection setting), and an in-vehicle transceiver 5. The HMI terminal 30a is a mobile terminal such as a mobile phone having a display function, for example.

  In FIG. 1, the case where the communication tag 10 which the pedestrian 1a is carrying and the HMI terminal 30a paired with this communication tag 10 is carried is illustrated. In this example, there are other pedestrians 1b to 1d around the pedestrian 1a. These pedestrians 1b to 1d carry, for example, HMI terminals 30b to 30d, respectively. Moreover, in FIG. 1, the case where the vehicle 3 is drive | working the place 100 meters-several hundred meters away from the pedestrian 1a is illustrated. The vehicle 3 is equipped with an in-vehicle transceiver 5 and the like. First, a configuration example of the communication tag 10 will be described.

  FIG. 2 is a block diagram illustrating a configuration example of the communication tag 10. As shown in FIG. 2, the communication tag 10 includes an inter-terminal short-range wireless communication unit (hereinafter referred to as a short-range wireless communication unit) 11, a medium-range wireless communication unit (that is, a tag communication unit) 13, and a GPS (Global Positioning System) module 15, control unit 50, storage unit 17, count unit 19, power supply control circuit 21, battery 23, charge / discharge control circuit 25, indicator 27, main power switch 29, Have.

The short-range wireless communication unit 11 transmits and receives data by a short-range wireless communication method (hereinafter referred to as short-range wireless communication) between terminals such as Bluetooth (registered trademark) and Zigbee (registered trademark) . An antenna 12 is connected to the short-range wireless communication unit 11. The communicable range (that is, communication distance) of the short-range wireless communication unit 11 is, for example, several meters to several tens of meters. For example, the short-range wireless communication unit 11 can be connected to the HMI terminals 30a to 30d by short-range wireless communication such as Bluetooth and Zigbee.

  The mid-range wireless communication unit 13 transmits and receives data using a mid-range wireless communication method (hereinafter referred to as “medium-range wireless communication”) such as RFID (Radio Frequency IDentification). Medium-range wireless communication is also called tag communication. An antenna 14 is connected to the mid-range wireless communication unit 13. The communication distance of the mid-range wireless communication unit 13 is, for example, 100 meters to several hundred meters. The mid-range wireless communication unit 13 can be connected to the in-vehicle transmitter / receiver 5 mounted on the vehicle 3 by mid-range radio communication, for example.

  In the short-range wireless communication unit 11 and the medium-range wireless communication unit 13 described above, the power required for data transmission / reception is obtained from the battery 23 instead of the induced electromotive force. Thereby, the short-range wireless communication unit 11 and the medium-range wireless communication unit 13 can stably transmit and receive data without depending on the external magnetic field environment. In addition, the medium-range wireless communication unit 13 can achieve a communication distance of a relatively medium to long distance in tag communication, such as 100 meters to several hundred meters, by receiving power supply from the battery. Note that the mid-range radio communication by the mid-range radio communication unit 13 has a longer communication distance than the short-range radio communication by the short-range radio communication unit 11. For this reason, the mid-range wireless communication unit 13 consumes more energy (electric power) in the communication process than the short-range wireless communication unit 11.

The GPS module 15 periodically detects its current position using a satellite positioning system. Further, when the GPS module 15 is moving, the GPS module 15 periodically detects the moving speed and moving direction. An antenna 16 is connected to the GPS module 15 and receives a signal transmitted from a satellite.
The control unit 50 is connected to each of the short-range wireless communication unit 11, the medium-range wireless communication unit 13, the GPS module 15, the storage unit 17, the count unit 19, the indicator 27, the power supply control circuit 21, and the charge / discharge control circuit 25. . The control unit 50 acquires various types of information from the short-range wireless communication unit 11, the medium-range wireless communication unit 13, the GPS module 15, the charge / discharge control circuit 25, and the like. And based on this acquired information, the control part 50 performs various processes. In order to execute these various processes, the control unit 50, as shown in FIG. 3, for example, includes a movement state detection unit 51, a mobile terminal detection unit 53, a transmission cycle adjustment unit 55, and a reception cycle adjustment unit 57. A vehicle detection unit 59, a vehicle approach determination unit 61, and an information providing unit 63. The control unit 50 is configured by a logic circuit such as a CPU, for example.

The storage unit 17 stores (stores) information acquired by the control unit 50. The storage unit 17 is configured by, for example, a flash memory. The count unit 19 measures time. The count unit 19 is configured by a circuit in which flip-flops are connected in multiple stages, for example.
The power supply control circuit 21 supplies power to the short-range wireless communication unit 11, the medium-range wireless communication unit 13, and the GPS module 15. The battery 23 is a power source for the communication tag 10. The battery 23 is charged from an external power source via the charge / discharge control circuit 25. The charge / discharge control circuit 25 maintains the stored amount (voltage) of the battery 23 between a preset upper limit value and lower limit value, and prevents overcharge and overdischarge. The indicator 27 displays its own communication state and the remaining battery level on the outside. The main power switch 29 is a switch that is turned on and off by a pedestrian (user) operation. When the main power switch 29 is turned on, the charge / discharge control circuit 25 operates, and predetermined power is supplied from the battery 23 to the power control circuit 21.

Next, processing of the communication tag 10 according to the first embodiment will be described with reference to FIGS.
FIG. 4 is a flowchart (main routine) showing processing of the communication tag 10 according to the first embodiment. Here, the process which the communication tag 10 performs is demonstrated.
In step (S) 11 of FIG. 4, the GPS module 15 acquires its current position based on a signal transmitted from a satellite. In addition, when the GPS module 15 is moving (that is, when the current position changes with time), the GPS module 15 acquires the moving speed and the moving direction together with the current position. In step (S) 12, information about the position measured in step (S) 11 (that is, GPS information) is output from the GPS module 15. The output GPS information is stored in the storage unit 17.

In step (S) 13, the movement state detection unit 51 shown in FIG. 3 reads the GPS information stored in the storage unit 17. And the movement state detection part 51 calculates the movement amount per preset time (for example, 1 minute) based on this read GPS information.
In step (S) 14, the movement state detection unit 51 determines whether or not the pedestrian la carrying the communication tag 10 is in a walking state based on the calculated movement amount. If an example is given, the movement state detection part 51 will determine with a walking state, when the movement amount computed by step (S) 13 exists in the range of 20 meters-200 meters per minute. Moreover, the movement state detection part 51 determines that it is not a walking state (namely, non-walking state), when the moving amount calculated by step (S) 13 is outside the range of 20 meters-200 meters per minute. .

  If it is determined in step (S) 14 that the user is in the walking state, the process proceeds to step (S) 15. If it is determined in step (S) 14 that the vehicle is not walking, the process proceeds to step (S) 19. In step (S) 15, a mobile terminal search via the short-range wireless communication unit 11 and a setting process for medium-range wireless communication based on the search result are performed. On the other hand, in step (S) 19, the intermediate-range wireless communication unit 13 stops the operation, that is, the communication process (transmission process and reception process).

  FIG. 5 is a flowchart (subroutine) showing the processing content of step (S) 15. In step (S) 31 of FIG. 5, the count unit 19 starts measuring time from zero (0). In step (S) 32, the short-range wireless communication unit 11 starts short-range wireless communication such as Bluetooth or Zigbee. In step (S) 33, the mobile terminal detection unit 53 searches for a mobile terminal via the short-range wireless communication unit 11. That is, under the control of the mobile terminal detection unit 53, the short-range wireless communication unit 11 attempts to receive the short-range wireless communication transmitted from the mobile terminal.

As an example, when the HMI terminals 30a to 30d exist within a radius of several meters to several tens of meters around the communication tag 10, the Bluetooth and Zigbee transmitted from these HMI terminals 30a to 30d are used. The short-range wireless communication such as is received by the short-range wireless communication unit 11 of the communication tag 10.
In step (S) 34, the mobile terminal detection unit 53 determines the presence / absence of a mobile terminal other than the paired HMI terminal 30a. For example, when the short-range wireless communication transmitted from the HMI terminal 30b is received for a preset time (for example, 1 minute), the mobile terminal detection unit 53 Is determined to exist. In addition, the mobile terminal detection unit 53 does not receive short-range wireless communication transmitted from other mobile terminals other than the HMI terminal 30a, or even when it is received, the time period is set in advance (for example, 1 If it is shorter than (min), it is determined that no other portable terminal exists in the vicinity.

  If it is determined that another portable terminal is present in the vicinity, the process proceeds to step (S) 35, and if it is determined that no other portable terminal exists, the process proceeds to step (S) 38. If it is determined that there is another mobile terminal, information regarding the number of detected mobile terminals (that is, the detected number) is stored in the storage unit 17. For example, when the mobile terminal detection unit 53 detects the HMI terminals 30a to 30d, the detected number n = 4 is stored in the storage unit 17.

In step (S) 35, based on the detection result in step (S) 33, control unit 50 adjusts the communication period (that is, the transmission period and the reception period) of medium-range wireless communication. This adjustment is performed as follows.
The transmission cycle adjustment unit 55 reads information related to the number of detections from the storage unit 17. Then, the transmission cycle adjustment unit 55 adjusts the transmission cycle of the medium distance wireless communication by the medium distance wireless communication unit 13 based on the read information. This adjustment can be performed based on the following formula (1), for example.
Ts1 / n ≦ Ts2 ≦ Ts1 (1)
Ts1 is a transmission cycle when another mobile terminal is not detected (hereinafter also referred to as normal time), Ts2 is an adjusted transmission cycle when another mobile terminal is detected, and n is a detected mobile terminal It is a number. In this example, since the mobile terminal detection unit 53 detects the HMI terminals 30a to 30d including other mobile terminals and n = 4, the transmission cycle Ts2 is adjusted within a range of 1 to 1/4 times Ts1. (See FIGS. 8A and 8B described later).

In step (S) 35, the reception cycle adjustment unit 57 also adjusts the reception cycle of the medium distance wireless communication by the medium distance wireless communication unit 13. That is, the reception cycle adjustment unit 57 reads information on the detected number from the storage unit 17. Then, the reception cycle adjustment unit 57 adjusts the reception cycle of the medium distance wireless communication by the medium distance wireless communication unit 13 based on the read information. This adjustment can be performed based on the following formula (2), for example.
Tr1 / n ≦ Tr2 ≦ Tr1 (2)
Tr1 is a normal reception cycle, and Tr2 is an adjusted reception cycle when another mobile terminal is detected. In this example, since n = 4, the reception cycle Tr2 is adjusted in a range of 1 to 1/4 times Tr1 (see FIGS. 8A and 8B described later).

  In step (S) 36, the mid-range radio communication unit 13 starts mid-range radio communication in the adjusted communication cycles Ts2, Tr2. In step (S) 37, the count unit 19 stops measuring time. The count value of the count unit 19 is returned to zero. After step (S) 37, the process returns to FIG. In step (S) 38, the mid-range radio communication unit 13 starts mid-range radio communication in the normal communication cycles Ts1, Tr1.

  In step (S) 16 of FIG. 4, the mid-range wireless communication unit 13 has the latest GPS information acquired by the GPS module 15 and its own ID information in the transmission cycle Ts 1 set in step (S) 15. , Information on the number of detected mobile terminals (that is, the detected number) is transmitted. In this example, n = 4 is transmitted as information related to the detected number. These pieces of information can be received by the in-vehicle transceiver 5 of the vehicle 3 that is traveling within the communicable range of the mid-range wireless communication unit 13.

In step (S) 17, a reception process in the medium range wireless communication unit 13 and a transmission / reception process in the short range wireless communication unit 11 are performed.
FIG. 6 is a flowchart (subroutine) showing the processing content of step (S) 17. In step (S) 51 of FIG. 6, the vehicle detection unit 59 uses the ID information of the vehicle 3 and the GPS information of the vehicle 3 (that is, the GPS module mounted on the vehicle 3 via the medium-range wireless communication unit 13). It is determined whether or not the measured position information of the vehicle 3 has been received. When it is determined that the ID information and GPS information of the vehicle 3 have been received, the process proceeds to step (S) 52, and when it is determined that the vehicle has not received the ID information and GPS information, the process proceeds to step (S) 56. In addition, when it determines with having received ID information and GPS information of the vehicle 3, those information is stored in the memory | storage part 17. FIG.

In step (S) 52, the vehicle approach determination unit 61 determines whether or not the vehicle 3 is approaching itself from the GPS information of the communication tag 10 (self) and the GPS information of the vehicle 3. When it is determined that the vehicle 3 is approaching itself, the process proceeds to step (S) 53, and when it is determined that the vehicle 3 is not approaching, the process proceeds to step (S) 56.
In step (S) 53, the vehicle approach determination unit 61 determines whether or not the expected arrival time until the vehicle 3 reaches itself is equal to or less than a preset time (for example, 10 seconds). Or the vehicle approach determination part 61 determines whether the distance between a vehicle and self is below a preset distance (for example, 100 meters).

FIG. 7 is a diagram illustrating an example of a positional relationship between the vehicle 3 and the pedestrian 1a. In FIG. 7, for example, let r be the radius of the short-range wireless communication area of the communication tag 10 carried by the pedestrian 1a. The distance between the communication tag 10 and the vehicle 3 is L. The distance L is, GPS coordinates communication tag 10 (i.e., the coordinate position which is the positioning by the GPS module 15) and the vehicle 3 of the GP S coordinate (i.e., the coordinate position which is the positioning by GPS module mounted on the vehicle 3) And the distance. Further, the speed of the vehicle 3 in the direction of the distance L (that is, the direction toward the pedestrian 1a) is V. At this time, the estimated arrival time t until the vehicle 3 reaches the pedestrian 1a is expressed by, for example, the following formula (3).
(L−r) / V ≦ t ≦ (L + r) / V (3)
When it is determined that the time t or the distance L is, for example, 10 seconds or 100 meters or less, the process proceeds to step (S) 54, and when it is determined that the value exceeds 10 seconds or 100 meters. Proceed to step (S) 56.

  In step (S) 54, the information providing unit 63 sends the vehicle 3 to another portable terminal other than the HMI terminal 30 a that exists in the short-range wireless communication area of the communication tag 10 via the short-range wireless communication unit 11. Provide access information. For example, when the HMI terminal 30b exists in this short-range wireless communication area, the HMI terminal 30b receives the approach information of the vehicle 3 by Bluetooth, Zigbee or the like.

  Further, the process of step (S) 55 is performed before or after or in parallel with step (S) 54. In step (S) 55, the information providing unit 63 provides the approach information of the vehicle 3 to the HMI terminal 30 a paired with the communication tag 10 via the short-range wireless communication unit 11. That is, the communication tag 10 notifies the approach of the vehicle 3 to the pedestrian 1a through the paired HMI terminal 30a. After steps (S) 54 and 55, the process returns to FIG.

In step (S) 18 of FIG. 4, it is determined whether the main power switch 29 is on or off.
If the main power switch 29 is kept on, the process returns to step (S) 11. Further, when the main power switch 29 is turned off by the operation of the pedestrian 1a or the like, the processing of the communication tag 10 shown in FIG. 4 is ended.
FIGS. 8A and 8B are diagrams illustrating an example of transmission periods Ts1 and Ts2 and reception periods Tr1 and Tr2 of medium-range wireless communication. As shown in FIGS. 8A and 8B, when the transmission cycle of the medium-range wireless communication is Ts2, the number of executions of the transmission mode per time can be increased compared to the case of Ts1. Thereby, the mid-range wireless communication unit 13 can transmit the information updated more frequently.

(Operation)
Next, an operation example of the first embodiment will be described. Here, the case shown in FIG. 1 is assumed for easy understanding of the operation example. That is, the pedestrian 1a carries the communication tag 10 and the HMI terminal 30a. There are other pedestrians 1b to 1d around the pedestrian 1a. Pedestrians 1b to 1d carry HMI terminals 30b to 30d, respectively. Furthermore, the case where the vehicle 3 carrying the vehicle-mounted transmitter / receiver 5 is driving | running | working the place 100 meters-several hundred meters away from the pedestrians 1a-1d is assumed.

First, the GPS module 15 of the communication tag 10 repeatedly acquires its current position at a certain time. Information on the current position is read to the control unit 50 via the storage unit 17. Based on the read information, the control unit 50 determines whether or not its own moving state corresponds to a walking state.
When the movement state of the user corresponds to the walking state, the control unit 50 repeatedly searches for the portable terminal via the short-range wireless communication unit 11 after a certain period of time. When another mobile terminal other than the HMI terminal 30a paired with the communication tag 10 is detected by this search, the transmission distance and reception period of the medium distance wireless communication by the medium distance wireless communication unit 13 are adjusted.

  For example, when the detected mobile terminals are the HMI terminals 30a to 30d, other mobile terminals are detected, and the number of detected mobile terminals (that is, the detected number) is n = 4. In this case, as shown in FIGS. 8A and 8B, the transmission cycle and the reception cycle of the medium-range wireless communication are changed (adjusted) to Ts2 and Tr2, respectively. In the intermediate-range wireless communication unit 13, at least the length of the transmission mode (that is, the transmission time per time) is maintained at the same value before and after the adjustment. Further, since the length of the reception mode is sufficiently longer than the length of the transmission mode, the length of the reception mode after adjustment (that is, the reception time per time) may be set shorter than that before the adjustment. For example, the length of the reception mode after adjustment shown in FIG. 8B is set to ½ times the length of the reception mode before adjustment shown in FIG.

Thus, after the communication cycle of the medium distance wireless communication is adjusted, the medium distance wireless communication unit 13 transmits the ID information and GPS information of the communication tag 10 (self), and information on the number of detected mobile terminals. To do. The transmitted ID information and GPS information of the communication tag 10 are received by the in-vehicle transceiver 5 on which the vehicle 3 is mounted.
FIG. 9 is a diagram illustrating an example of the monitor screen 7 mounted on the vehicle 3. The monitor screen 7 shown in FIG. 9 is a part of a car navigation system mounted on the vehicle 3, for example, and displays the position of the pedestrian 1a and the number of pedestrians 1a to 1d together with the map. In this example, the in-vehicle transmitter / receiver 5 receives n = 4 as information regarding the number of detected mobile terminals. For this reason, the monitor screen 7 displays the number of pedestrians 1a to 1d (four people) together with the position of the pedestrian 1a.

  In addition, this car navigation system may notify the driver of the presence of a pedestrian by voice from a speaker in combination with the display on the monitor screen 7 (or separately from the display on the monitor screen 7). The notification content includes, for example, an estimated arrival time until the vehicle 3 reaches the pedestrian 1a, a distance between the pedestrian 1a and the vehicle 3, and the number of pedestrians. As a result, the driver of the vehicle 3 indicates that the pedestrian 1a is present in the traveling direction of the vehicle 3 (for example, when going straight or straight, when turning right, when turning right, when turning left, when turning left). I can know. The driver of the vehicle 3 walks with the presence of other pedestrians 1b to 1d around the pedestrian 1a (that is, when the communication tag 10 detects the HMI terminals 30b to 30d). Know the number of people.

On the other hand, the mid-range wireless communication unit 13 acquires the ID information of the vehicle 3 and the GPS information of the vehicle 3 transmitted from the in-vehicle transceiver 5. The control unit 50 determines whether or not the vehicle 3 is approaching itself based on the GPS information of the vehicle 3 and its own GPS information.
When the vehicle 3 is approaching, an expected arrival time until the vehicle 3 reaches itself (or a distance between the vehicle 3 and itself) is calculated. When this time (or distance) is equal to or less than a preset value, the control unit 50 transmits the approach information of the vehicle 3 to the HMI terminals 30b to 30d via the short-range wireless communication unit 11. The pedestrians 1b to 1d carrying the HMI terminals 30b to 30d can know the approach of the vehicle 3 through the HMI terminals 30b to 30d.

  In addition, before or after this, or in parallel, the control unit 50 notifies the HMI terminal 30a paired with the communication tag 10 of the approach information of the vehicle 3 via the short-range wireless communication unit 11. That is, the communication tag 10 notifies the approach of the vehicle 3 to the pedestrian 1a through the paired HMI terminal 30a. The notification content includes, for example, a predicted arrival time until the vehicle 3 reaches the pedestrian 1a, a distance between the pedestrian 1a and the vehicle 3, and the like. The notification content of the communication tag 10 for the HMI terminals 30b to 30d and the notification content for the HMI terminal 30a may be the same, or some of them may be different.

  FIG. 10 is a diagram illustrating an example of the HMI terminal 30. As shown in FIG. 10, the HMI terminal 30 (30a to 30d) may display on which screen the vehicle 3 is approaching. Furthermore, the HMI terminal 30 may sound a buzzer from a built-in speaker, vibrate the terminal itself, or blink an indicator such as an LED (light emitting diode) as the vehicle 3 approaches. In this case, the HMI terminal 30 may gradually increase the volume, gradually vibrate strongly, or gradually shorten the blinking interval according to the distance to the vehicle 3 and the estimated arrival time. Thereby, the pedestrian 1a can know the approach of the vehicle 3 via the HMI terminal 30a even when the vehicle 3 approaches the scale from the rear.

  In the first embodiment and the second and third embodiments described later, the short-range wireless communication corresponds to the first wireless communication method, and the short-range wireless communication unit 11 corresponds to the first wireless communication means. Yes. The GPS module 15 corresponds to position information acquisition means. The medium distance wireless communication corresponds to the second wireless communication method, and the medium distance wireless communication unit 13 corresponds to the second wireless communication means. The portable terminal detection unit 53 corresponds to portable terminal detection means. The transmission cycle adjustment unit 55 corresponds to transmission cycle adjustment means. The vehicle detection unit 59 corresponds to vehicle detection means. The vehicle approach determination unit 61 corresponds to a vehicle approach determination unit. The in-vehicle transceiver 5 corresponds to the receiving means of the in-vehicle device. The monitor screen 7 corresponds to the display means of the in-vehicle device.

(Effect of 1st Embodiment)
The first embodiment has the following effects.
(1) The communication tag 10 notifies its own ID information and GPS information to the vehicle 3 existing at a position far away (for example, traveling about a few tens to several hundred meters away from the communication tag 10). To do. In addition, when the communication tag 10 detects another portable terminal (for example, the HMI terminals 30b to 30d) other than the paired HMI terminal 30a, the communication tag 10 also notifies the vehicle 3 of information about the detected other portable terminals. (Step (S) 16). The vehicle 3 can know whether or not a mobile terminal exists around the communication tag 10 based on the notified information. Thereby, for example, the driver of the vehicle 3 knows not only the pedestrian 1a carrying the communication tag 10 but also the other pedestrians 1b to 1d not carrying the communication tag 10. Can do.

(2) The mid-range wireless communication unit 13 transmits information on the number of detected mobile terminals (that is, the detected number) as information on the mobile terminals. For example, when the mobile terminal detection unit 53 detects the HMI terminals 30a to 30d, the mid-range wireless communication unit 13 transmits the number of detected HMI terminals n = 4 together with the ID information and GPS information of the communication tag 10. (Step (S) 16). The in-vehicle transceiver 5 can receive the transmitted information. Thereby, the driver | operator of the vehicle 3 can know that the other pedestrians 1b-1d exist around the pedestrian 1a, and the number of pedestrians 1a-1d.
(3) The transmission cycle adjustment unit 55 adjusts the transmission cycle of the medium-range wireless communication based on the detection result of the mobile terminal. For example, when the number of detected mobile terminals is equal to or greater than a preset number, the transmission cycle of the medium-range wireless communication is changed from normal ts1 to a shorter ts2 (step (S) 35). Thereby, when there are many mobile terminals around the communication tag 10, the latest information regarding the detected number can be notified to the vehicle at a higher frequency than usual.

(4) The movement state detection unit 51 detects its own movement state based on its own GPS information acquired by the GPS module 15 (steps (S) 13, 14). The medium-range wireless communication unit 13 stops the operation when the detected movement state of itself does not correspond to the walking state (step (S) 19). That is, the communication tag 10 stops the communication process by the medium distance wireless communication when it is estimated that the pedestrian is not walking. Thereby, battery consumption can be suppressed.
(5) After stopping the medium distance wireless communication, the medium distance wireless communication unit 13 starts the medium distance wireless communication when the movement state of the medium distance wireless communication unit 13 corresponds to the walking state (step (S)). 14). That is, the communication tag 10 resumes the mid-range wireless communication when it is estimated that the pedestrian has resumed walking. Thereby, the communication tag 10 can notify the driver of the vehicle 3 again of the presence of the pedestrian 1a and the like.

(6) The mid-range wireless communication unit 13 acquires, for example, ID information and GPS information of the vehicle 3 traveling 100 meters to several hundred meters ahead (step (S) 51). The vehicle detection unit 59 determines whether or not the vehicle 3 is approaching to itself based on the GPS information of the vehicle 3 and its own GPS information (step (S) 52). When it is determined that the vehicle 3 is approaching, the short-range wireless communication unit 11 transmits the approach information of the vehicle 3 by short-range wireless communication such as Bluetooth or Zigbee (steps (S) 54 and 55). ). Accordingly, for example, not only the pedestrian 1a carrying the communication tag 10 but also the pedestrians 1b to 1d not carrying the communication tag 10 are notified of the approach of the vehicle 3 via the HMI terminals 30b to 30d. be able to.

(Modification)
(1) In the first embodiment, the case where the medium-range wireless communication unit 13 transmits information related to the detected number of the HMI terminals 30a to 30d as the information related to the detected mobile terminal is illustrated. However, in the first embodiment and each of the embodiments described later, the information transmitted by the communication tag is not limited to information related to the detected number.
For example, the communication tag 10 may transmit distance information between the detected HMI terminals 30b to 30d and the communication tag 10 (self) as the information. That is, the communication tag 10 may transmit both the information regarding the detected number and the distance information together with its own ID information and GPS information. Alternatively, the communication tag 10 may transmit distance information together with its own ID information and GPS information (information on the detected number may not be transmitted).
Also in this case, the in-vehicle transceiver 5 receives the transmitted information. As shown in FIG. 9, for example, in the monitor screen 7, a range where the pedestrians 1 b to 1 d can exist is indicated by a broken line or the like centered on the pedestrian 1 a. Thereby, the driver | operator of the vehicle 3 can grasp | ascertain the range which the other pedestrians 1b-1d can exist centering on the pedestrian 1a.

(2) In the first embodiment described above, the mid-range wireless communication unit 13 walks carrying itself in addition to the ID information of the communication tag 10 (self), GPS information, and information about the detected portable terminal. The pedestrian type information of the person 1a may be transmitted. The pedestrian type information is information such as “infant”, “child”, “elderly”, and “handicapped”. The pedestrian type information is stored in advance in the storage unit 17, for example. For example, the pedestrian type information is read from the storage unit 17 in step (S) 16 shown in FIG. The medium distance wireless communication unit 13 transmits the read pedestrian type information.
The in-vehicle transceiver 5 receives the transmitted pedestrian type information. The driver of the vehicle 3 can know the received pedestrian type information by, for example, sound from the monitor screen 7 or a speaker. For example, when the pedestrian 1a is an infant or a child, the driver can pay attention to the possibility that the pedestrian 1a suddenly starts running or jumps out onto the roadway.

(3) In said 1st Embodiment, the pedestrian 1a carried the communication tag 10, and illustrated the case where presence of the pedestrian 1a was notified to the vehicle 3 via this communication tag 10. FIG. However, in the first embodiment and each of the embodiments described later, the communication tag 10 is not limited to being carried by a pedestrian. For example, the communication tag 10 may be attached to an obstacle or luggage on a road. In such a case, the vehicle is notified of the presence of obstacles, luggage, etc. on the road via the communication tag 10.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, parts having the same configuration as in the first embodiment will be described with the same reference numerals. In the first embodiment described above, the communication tag 10 has been described by taking as an example the case where the transmission cycle of the mid-range wireless communication is adjusted based on the detection results of the mobile terminals such as the HMI terminals 30a to 30d.
In the second embodiment, as shown in FIG. 11, it is assumed that another communication tag (that is, the same type tag) 20 having the same function as the communication tag 10 exists around the communication tag 10. Based on this assumption, an example will be described in which the communication tag 10 detects the same type tag 20 and adjusts the transmission cycle of the medium-range wireless communication based on the detection result.

(Constitution)
FIG. 12 is a diagram illustrating a configuration example of the control unit 150 according to the second embodiment.
As shown in FIG. 12, the control unit 150 includes, for example, a moving state detection unit 51, a mobile terminal detection unit 53, a transmission cycle adjustment unit 55, a reception cycle adjustment unit 57, a vehicle detection unit 59, and a vehicle. An approach determination unit 61, an information providing unit 63, and a communication tag detection unit 65 are included. The control unit 150 is configured by a logic circuit such as a CPU, for example. In the second embodiment, the control unit 50 is replaced with the control unit 150 in the communication tag 10 shown in FIG.

FIG. 13 is a flowchart (subroutine) showing the processing content of step (S) 15 of the communication tag 10 according to the second embodiment. In step (S) 71 of FIG. 13, the counting unit 19 starts measuring time from zero (0). In step (S) 72, the short-range wireless communication unit 11 starts short-range wireless communication such as Bluetooth or Zigbee.
In step (S) 73, the mobile terminal detection unit 53 searches the mobile terminal and the same type tag 20 through the short-range wireless communication unit 11. That is, under the control of the portable terminal detection unit 53, the short-range wireless communication unit 11 attempts to receive short-range wireless communication transmitted from the portable terminal or short-range wireless communication transmitted from the same type tag 20. . For example, when the same type tag 20 exists within a radius of several meters to several tens of meters around the communication tag 10, short-range wireless communication such as Bluetooth or Zigbee transmitted from the same type tag 20 is performed. Received by the short-range wireless communication unit 11 of the communication tag 10.

In step (S) 74, the mobile terminal detection unit 53 determines the presence / absence of a mobile terminal other than the paired HMI terminal 30a. The process performed in step (S) 74 is the same as the process performed in step (S) 34 shown in FIG.
If it is determined that another portable terminal is present in the vicinity, the process proceeds to step (S) 75, and if it is determined that no other mobile terminal exists, the process proceeds to step (S) 79. If it is determined that there is another mobile terminal, information regarding the number of detected mobile terminals (that is, the detected number) is stored in the storage unit 17. For example, when the mobile terminal detection unit 53 detects the HMI terminals 30a to 30d, the detected number n = 4 is stored in the storage unit 17.

  In step (S) 75, the communication tag detection unit 65 determines whether or not there is the same type tag 20. For example, the communication tag detection unit 65 may receive the same type tag 20 when short-range wireless communication transmitted from the same type tag 20 is received for a preset time (for example, 1 minute). Is determined to exist around. Further, the communication tag detection unit 65 does not receive the short-range wireless communication transmitted from the same type tag 20, or even when it is received, the period is shorter than a preset time (for example, 1 minute). In this case, it is determined that the same type tag 20 does not exist around. If it is determined that the same type tag 20 does not exist in the vicinity, the process proceeds to step (S) 76, and if it is determined that the same type tag 20 exists, the process proceeds to step (S) 83.

  In step (S) 76, based on the detection result in step (S) 73, control unit 50 adjusts the communication period (that is, the transmission period and the reception period) of medium-range wireless communication. In this example, the process performed in step (S) 76 is the same as the process performed in step (S) 35 shown in FIG. The transmission cycle adjustment unit 55 adjusts the transmission cycle of medium-range wireless communication to Ts2, and the reception cycle adjustment unit 57 adjusts the reception cycle of medium-range wireless communication to Tr2.

In step (S) 77, the mid-range radio communication unit 13 starts mid-range radio communication in the adjusted communication cycles Ts2, Tr2. In step (S) 78, the counting unit 19 stops measuring time. The count value of the count unit 19 is returned to zero. After step (S) 78, the process returns to FIG.
On the other hand, the process performed in step (S) 79 is the same as the process performed in step (S) 75. If it is determined that the same type tag 20 does not exist in the surroundings, the process proceeds to step (S) 80, and if it is determined that it exists, the process proceeds to step (S) 81.

In step (S) 81, based on the detection result in step (S) 73, transmission cycle adjustment unit 55 and reception cycle adjustment unit 57 adjust the transmission cycle and the reception cycle of medium-range wireless communication, respectively. This adjustment can be performed based on the following formulas (4) and (5), for example.
Ts1 ≦ Ts3 ≦ m × Ts1 (4)
Ts3 is an adjusted transmission cycle when no other portable terminal is detected and the same type tag 20 is detected. m is the number obtained by adding self to the number of the same type tags 20 detected. For example, when one identical type tag 20 is detected, m = 2, so the transmission cycle Ts3 is adjusted in a range of 1 to 2 times Ts1.
Tr1 ≦ Tr3 ≦ m × Tr1 (5)
Tr3 is the adjusted reception cycle when no other portable terminal is detected and the same type tag 20 is detected. In this example, since m = 2, the reception cycle Tr3 is adjusted in a range of 1 to 2 times Tr1. In step (S) 82, the mid-range radio communication unit 13 starts mid-range radio communication in the adjusted communication cycles Ts3 and Tr3.

On the other hand, also in step (S) 83, based on the detection result in step (S) 73, transmission cycle adjustment unit 55 and reception cycle adjustment unit 57 adjust the transmission cycle and the reception cycle of medium-range wireless communication, respectively. This adjustment can be performed based on, for example, the following formulas (6) and (7).
Ts1 / n ≦ Ts4 ≦ m × Ts1 (6)
Ts4 is an adjusted transmission cycle when another mobile terminal is detected and the same type tag 20 is also detected. In this example, since n = 4 and m = 2, the transmission period Ts4 is adjusted in a range of 1/4 to 2 times Ts1 (see FIG. 14B described later).
Tr1 / n ≦ Tr4 ≦ m × Tr1 (7)
Tr4 is an adjusted reception cycle when another mobile terminal is detected and the same type tag 20 is also detected. In this example, since n = 4 and m = 2, the reception cycle Tr4 is adjusted in a range of 1/4 to 2 times Tr1 (see FIG. 14B described later). In step (S) 84, the mid-range radio communication unit 13 starts mid-range radio communication in the adjusted communication cycles Ts4 and Tr4.

14A and 14B are diagrams illustrating an example of transmission periods Ts1 and Ts4 and reception periods Tr1 and Tr4 of medium-range wireless communication in the communication tag 10. FIG. 14C is a diagram illustrating an example of a transmission cycle Ts′4 and a reception cycle Tr′4 of medium-range wireless communication in the same type tag 20.
As shown in FIGS. 14 (a) and 14 (b), in the communication tag 10, when the transmission cycle of medium-range wireless communication is changed from Ts1 to Ts4 and the reception cycle is changed from Tr1 to Tr4, the transmission mode per time The number of executions of is reduced. The transmission mode consumes more power than the reception mode. For this reason, it becomes possible to reduce the amount of power consumption in the mid-range wireless communication unit 13.

Further, when the middle-range wireless communication unit 13 of the communication tag 10 starts operation with the communication periods Ts4 and Tr4, the same type tag 20 exists around the communication tag 10. As shown in FIG. 14 (c), the same type tag 20 also transmits GPS information and the like by mid-range wireless communication, like the communication tag 10.
Here, as shown in FIG. 11, when the communication tag 10 and the same type tag 20 are sufficiently separated from the vehicle 3, the communication tag 10 and the same type tag 20 are separated from the driver of the vehicle 3. When you see it, it exists in almost the same position. In other words, when the communication tag 10 and the vehicle 3 are sufficiently separated, the GPS information of the communication tag 10 and the GPS information of the same type tag 20 can be said to be substantially the same position information as viewed from the driver of the vehicle 3. . At this time, the difference between the GPS information of the communication tag 10 and the GPS information of the same type tag 20 is an error within a range that is permissible for the driver. Therefore, when the communication tag 10 and the vehicle 3 are sufficiently separated from each other, the communication tag 10 and the same type tag 20 can share GPS information transmission processing with respect to the vehicle 3. Other configurations are the same as those in the first embodiment.

(Operation)
Next, an operation example of the second embodiment will be described. As in the first embodiment, the case shown in FIG. 11 is assumed in order to easily explain the operation example.
First, the GPS module 15 of the communication tag 10 repeatedly acquires its current position after a certain period of time. Information on the current position is read to the control unit 150 via the storage unit 17. Based on the read information, the control unit 150 determines whether or not the movement state of the communication tag 10 (self) corresponds to the walking state.
When the moving state of the control unit 150 corresponds to the walking state, the control unit 150 repeatedly searches for the same type tag 20 as the portable terminal via the short-range wireless communication unit 11 after a certain period of time. When at least one of the other portable terminal not paired with the communication tag 10 or the same type tag 20 is detected by this search, the control unit 150 adjusts the communication cycle of the medium-range wireless communication. Do. The mid-range wireless communication unit 13 starts operation in the adjusted communication cycle. The subsequent operations are the same as those in the first embodiment.
In the second embodiment, the communication tag detection unit 65 corresponds to communication tag detection means.

(Effect of 2nd Embodiment)
The second embodiment has the following effects in addition to the effects of the first embodiment.
(1) The communication tag detection unit 65 detects the same type tag 20 via the short-range wireless communication unit 11. The transmission cycle adjustment unit 55 adjusts the transmission cycle based on the detection result of the same type tag 20. For example, when the same type tag is detected, the transmission cycle adjustment unit 55 changes the transmission cycle of the medium distance wireless communication from Ts1 to Ts3 or Ts4. Since the number of executions of the transmission mode per time can be reduced, it is possible to reduce the power consumption in the medium-range wireless communication unit 13.
(2) When the same type tag 20 is detected around the communication tag 10, the same type tag 20 also performs medium-range wireless communication in the same manner as the communication tag 10. When the communication tag 10 and the vehicle 3 are sufficiently separated, it can be said that the GPS information of the same type tag 20 as the GPS information of the communication tag 10 is substantially the same position information as viewed from the driver of the vehicle 3. Therefore, when the communication tag 10 and the vehicle 3 are sufficiently separated from each other, the communication tag 10 and the same type tag 20 can share GPS information transmission processing with respect to the vehicle 3.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to the drawings. In the third embodiment, parts having the same configurations as those in the above embodiments will be described with the same reference numerals.
In the first embodiment, the movement state detection unit 51 determines whether or not the pedestrian la carrying the communication tag 10 is in a walking state based on positioning information (that is, GPS information) by the GPS module 15. The case of performing is described (step (S) 14). In the third embodiment, an example in which the moving state detection unit 51 determines whether or not the pedestrian la carrying the communication tag 10 is in the vehicle after step (S) 14 will be described. To do.

(Constitution)
FIG. 15 is a flowchart (main routine) showing processing of the communication tag 10 according to the third embodiment. In the third embodiment, a step (S) 21 is newly provided between step (S) 14 and step (S) 15 as compared with the first embodiment. Other configurations are the same as those in FIG. 4 described in the first embodiment. Therefore, here, the processing content of step (S) 21 will be described.
In step (S) 21 in FIG. 15, the movement state detection unit 51 determines whether short-range wireless communication (for example, a signal from the in-vehicle Bluetooth device) output from the in-vehicle device is detected. This detection is performed for a preset time (for example, 1 minute) via the short-range wireless communication unit 11. Note that it is possible to determine whether or not the detected Bluetooth signal is a signal output from the in-vehicle device based on profile information included in this signal. For example, if the profile of the detected Bluetooth signal is HFP, it can be determined that this signal is a signal output from the in-vehicle device.

  If it is determined in step (S) 21 that the in-vehicle Bluetooth signal is detected, it is determined that the pedestrian 1a is in the vehicle 3 or in a vehicle other than the vehicle 3. In this case, the process proceeds to step (S) 19 and the intermediate-range wireless communication unit 13 stops its operation. On the other hand, if it is determined in step (S) 21 that a signal from the in-vehicle Bluetooth device is not detected, the process proceeds to step (S) 15. Other configurations are the same as those in the first embodiment.

(Operation)
Next, an operation example of the third embodiment will be described. As in the first embodiment, the case shown in FIG. 1 is assumed for easy understanding of the operation example.
First, the GPS module 15 of the communication tag 10 repeatedly acquires its current position after a certain period of time. Information on the current position is read to the control unit 50 via the storage unit 17. Based on the read information, the control unit 50 determines whether or not its own moving state corresponds to a walking state.
When the own movement state corresponds to the walking state, the control unit 50 tries to detect the in-vehicle Bluetooth signal via the short-range wireless communication unit 11. For example, when the in-vehicle Bluetooth signal is detected for one minute, it is determined that the pedestrian 1a is in the vehicle 3 or in another vehicle other than the vehicle 3. In that case, the operation of the mid-range wireless communication unit 13 is stopped. On the other hand, if the in-vehicle Bluetooth signal is not detected, or even if it is detected, the period is less than 1 minute, for example, the control unit 50 searches for the same type tag via the short-range wireless communication unit 11 for a certain period of time. Repeat this step. The subsequent operations are the same as those in the first embodiment or the second embodiment.

(Effect of the third embodiment)
The third embodiment has the following effects in addition to the effects of the first embodiment or the second embodiment.
(1) If the in-vehicle Bluetooth signal is received for a preset time (for example, 1 minute), the intermediate distance wireless communication unit 13 stops the intermediate distance wireless communication (steps (S) 21 and 19). ). When the in-vehicle Bluetooth signal is received, it is estimated that the pedestrian 1a carrying the communication tag 10 is on the vehicle. For this reason, the mid-range wireless communication unit 13 can stop the communication process and suppress battery consumption.
(2) The intermediate-range wireless communication unit 13 starts the stopped intermediate-range wireless communication according to the reception status of the in-vehicle Bluetooth signal. That is, the medium distance wireless communication unit 13 starts the operation when the in-vehicle Bluetooth signal is not received for one minute after stopping the medium distance wireless communication (steps (S) 21, 15, and 16). When the in-vehicle Bluetooth signal is not received, it can be estimated that the pedestrian 1a carrying the communication tag 10 has got off the vehicle. For this reason, the mid-range wireless communication unit 13 starts the communication process.

(Modification)
In said 3rd Embodiment, the case where the movement state detection part 51 determined whether the pedestrian 1a exists in a vehicle based on the vehicle-mounted Bluetooth signal was illustrated. However, in the present embodiment, the movement state detection unit 51 takes into account the in-vehicle Bluetooth signal, the own GPS information acquired by the GPS module 15 (for example, detection of high-speed movement or no signal reception at all). Thus, it may be determined whether or not the pedestrian 1a is in the vehicle. Thereby, the determination precision by the movement state detection part 51 can further be improved.

1a to 1d Pedestrian 3 Vehicle 5 Vehicle-mounted transceiver 7 Monitor screen 10 Communication tag 11 Short-range wireless communication unit 12, 14, 16 Antenna 13 Medium-range wireless communication unit 15 GPS module 17 Storage unit 19 Count unit 20 Same type tag 21 Power supply Control circuit 23 Battery 25 Charge / discharge control circuit 27 Indicator 29 Main power switch 30a-30d HMI terminal 50 Control unit 51 Moving state detection unit 53 Portable terminal detection unit 55 Transmission cycle adjustment unit 59 Vehicle detection unit 61 Vehicle approach determination unit 63 Information provision Unit 65 communication tag detection unit 100 driving support system Tr1 (normal) reception cycle Tr2, Tr3, Tr4 (adjusted) reception cycle Ts1 (normal) transmission cycle Ts2, Ts3, Ts4 (adjusted) transmission cycle

Claims (10)

A communication tag for driving assistance to notify the vehicle of the presence of the vehicle,
First wireless communication means for communicating by a first wireless communication method;
Position information acquisition means for acquiring position information of the communication tag;
A portable terminal detecting means for detecting a portable terminal capable of communicating by the first wireless communication method via the first wireless communication means;
Communication tag detecting means for detecting another communication tag having the same function as the communication tag via the first wireless communication means;
The position information of the communication tag acquired by the position information acquisition means, and the information related to the mobile terminal paired with the communication tag among the information related to the mobile terminal detected by the mobile terminal detection means, A second wireless communication means for transmitting by a second wireless communication method having a communication distance longer than that of the first wireless communication method ,
When it is determined by the mobile terminal detection means that there is another mobile terminal that is not paired with the communication tag among the mobile terminals, and the communication tag detection means determines that there is no other communication tag The second wireless communication means also transmits information on the other portable terminal detected by the portable terminal detection means .   2. The driving support communication tag according to claim 1, wherein the second wireless communication unit transmits the number information of the detected mobile terminals as information on the mobile terminals.   The said 2nd radio | wireless communication means transmits the distance information between the detected said portable terminal and the said communication tag as information regarding the said portable terminal, The Claim 1 or Claim 2 characterized by the above-mentioned. Communication tag for driving support.   4. The transmission cycle adjustment unit according to claim 1, further comprising a transmission cycle adjustment unit configured to adjust a transmission cycle of the second wireless communication scheme based on a detection result of the mobile terminal. 5. Communication tag for driving support. Based on the position information of the communication tag acquired by the position information acquisition means, further comprising a movement amount detection means for detecting the movement amount of the communication tag per time,
The second wireless communication unit stops transmission processing by the second wireless communication method when the movement amount deviates from a preset allowable movement amount range. The communication tag for driving assistance according to any one of claims 4 to 5 . The second wireless communication means uses the second wireless communication method when the movement amount falls within the allowable movement amount range after stopping the transmission processing by the second wireless communication method. The communication tag for driving support according to claim 5 , wherein transmission processing is started. The second wireless communication unit stops transmission processing by the second wireless communication method when in-vehicle wireless communication is received by the first wireless communication unit for a preset time. The communication tag for driving support according to any one of claims 1 to 6 , wherein the communication tag is used. When the second wireless communication means does not receive the in-vehicle wireless communication by the first wireless communication means for a preset time after stopping the transmission processing by the second wireless communication method 8. The communication tag for driving support according to claim 7 , wherein transmission processing by the second wireless communication system is started. Vehicle detection means for detecting the vehicle via the second wireless communication means;
Whether the vehicle is approaching the communication tag is determined based on the position information of the vehicle detected by the vehicle detection means and the position information of the communication tag acquired by the position information acquisition means. Vehicle approach determining means for
The first wireless communication means includes
When the vehicle is determined to be approaching by the vehicle approach determination means, any claim 8 to the approach information of the vehicle from claim 1, characterized by transmitting in said first wireless communication system A communication tag for driving support according to claim 1. A driving support system for notifying a vehicle of the presence of a communication tag,
Including the communication tag and an in-vehicle device mounted on the vehicle,
The communication tag is
First wireless communication means for communicating by a first wireless communication method;
Position information acquisition means for acquiring position information of the communication tag;
A portable terminal detecting means for detecting a portable terminal capable of communicating by the first wireless communication method via the first wireless communication means;
Communication tag detecting means for detecting another communication tag having the same function as the communication tag via the first wireless communication means;
The position information of the communication tag acquired by the position information acquisition means, and the information related to the mobile terminal paired with the communication tag among the information related to the mobile terminal detected by the mobile terminal detection means, A second wireless communication means for transmitting by a second wireless communication method having a communication distance longer than that of the first wireless communication method ,
When it is determined by the mobile terminal detection means that there is another mobile terminal that is not paired with the communication tag among the mobile terminals, and the communication tag detection means determines that there is no other communication tag The second wireless communication means also transmits information on the other portable terminal detected by the portable terminal detection means,
The in-vehicle device is
Receiving means for receiving position information of the communication tag transmitted from the communication tag by the second wireless communication method and information on the mobile terminal;
A driving support system comprising: display means for displaying position information of the communication tag received by the receiving means and information relating to the portable terminal in at least one of sound and image.

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