JP2007233478A - Approach-informing system, on-vehicle machine used for the same, and portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an approach-informing system which makes effective use of channels, and also provide an on-vehicle machine used for the system and a portable terminal. <P>SOLUTION: In the approach-informing system, a vehicle and a pedestrian are informed that they are approaching to each other by the on-vehicle machine's reception of transmission waves from a portable terminal which the pedestrian carries with him (or her). In this case, when the pedestrian is determined to be in an area regarded as a low-necessity stage, in which there is less need to inform that the vehicle and the pedestrian are approaching to each other, by the acquisition of positional information (the direction and distance) on the pedestrian who is the owner of the portable terminal 12, and the traveling state of the vehicle of speed information, turn-signal information and navigation information, the transmission intervals of the transmission waves are set to be longer than usual. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for notifying that a person carrying a mobile terminal and a vehicle are approaching each other.

Conventionally, an on-vehicle alarm device and a vehicle that receive a radio wave emitted by a portable terminal carried by a person and issue an alarm to a driver by determining whether the portable terminal is present in a predetermined alarm area. Alarm systems are known (for example, see Patent Document 1).
JP 2005-202893 A

  However, in the above-described conventional technology, since the mobile terminal transmits radio waves to the in-vehicle device, when there are a large number of mobile terminals, transmission from a large number of mobile terminals concentrates on the in-vehicle device and the communication channel is insufficient. There was a risk.

  Therefore, an object of the present invention is to provide an approach notification system that can effectively use a channel, and an in-vehicle device and a portable terminal used therefor.

  In order to solve the above-mentioned problem, as a first invention, in the approach notification system capable of notifying that the vehicle and the person are approaching each other by the vehicle-mounted device receiving the transmission wave of the portable terminal carried by the person, An approach notification system is provided, wherein a transmission interval of the transmission wave is set based on a traveling state of a vehicle.

  As a second invention, there is provided an approach notification system in which the traveling state is a vehicle speed, and the transmission interval is set longer when the vehicle speed is low than when the vehicle speed is high.

  According to a third aspect of the present invention, there is provided an approach notification system according to the first or second invention, wherein the transmission interval is adjusted according to a reception level of a transmission wave of an in-vehicle device received by a mobile terminal. .

  As a fourth invention, there is provided an approach notification system in which a plurality of mobile terminals are close to each other and a proximity terminal group is formed, and one mobile terminal transmits to an in-vehicle device as a representative terminal of the proximity terminal group To do.

  As 5th invention, each portable terminal has ID for identifying each, A representative terminal acquires ID of the other portable terminal which belongs to the same proximity terminal group as self, and it is vehicle-mounted with own ID. The vehicle-mounted device provides an approach notification system that returns an ID of a portable terminal that should notify the approach of the vehicle.

  As a sixth invention, a mobile terminal that newly joins the proximity terminal group when the number of mobile terminals constituting the proximity terminal group is a predetermined number or more does not transmit to the representative terminal, and at least one of the proximity terminal groups Provided is an approach notification system that acquires the ID of one portable terminal and compares the acquired ID with the ID returned by the vehicle-mounted device.

  As a seventh invention, the representative terminal provides an approach notification system that is a portable terminal that has previously communicated with the vehicle-mounted device.

  As an eighth invention, the mobile terminal determines the approaching state with the representative terminal based on the reception level of the transmission wave of the representative terminal, and transmits proximity information to the representative terminal when it is determined that the mobile terminal is in proximity. An approach notification system in which a proximity terminal group is formed is provided.

  As a ninth aspect of the invention, there is provided an approach notification system in which communication between adjacent mobile terminals is performed at a lower output than communication between an in-vehicle device and a mobile terminal.

  According to a tenth aspect of the present invention, there is provided an access notification system capable of notifying that a vehicle and a person are approaching each other when the vehicle-mounted device receives a transmission wave of the mobile terminal carried by the person. Provided is an approach notification system characterized in that when the number is larger than a predetermined number, the transmission interval of the transmission wave is set longer than when the number is small.

  As an eleventh aspect of the invention, there is provided an approach notification system according to the tenth aspect of the invention, wherein the transmission interval is adjusted according to the reception level of the transmission wave of the in-vehicle device received by the mobile terminal.

  As a twelfth aspect of the present invention, there is provided an in-vehicle device used in the approach notification system of the first aspect of the present invention, wherein a traveling state detecting means for detecting the traveling state of the vehicle and the traveling state detected by the traveling state detecting means are stored in a portable terminal. Provided is a vehicle-mounted device comprising a traveling state transmitting means for transmitting to the vehicle.

  According to a thirteenth aspect of the present invention, there is provided an in-vehicle device used in the approach notification system according to the first aspect of the present invention, wherein a traveling state detecting means for detecting a traveling state of the vehicle, and the transmission interval based on a detection result of the traveling state detecting means. An in-vehicle device is provided, comprising command means for commanding a setting to a portable terminal.

  As a fourteenth invention, an in-vehicle device used in the access notification system of the tenth invention, based on a terminal number detecting means for detecting the number of portable terminals in a predetermined area, and a detection result of the terminal number detecting means. An in-vehicle device is provided, comprising command means for instructing the portable terminal to set the transmission interval.

  According to a fifteenth aspect of the present invention, there is provided a portable terminal for use in the approach notification system according to the first, second, and tenth aspects of the present invention, comprising a changing unit that changes the transmission interval in response to a command from an in-vehicle device. Provide mobile devices.

  According to a sixteenth aspect of the present invention, there is provided a portable terminal for use in the approach notification system according to the first or second aspect of the present invention, based on the traveling state acquisition means for acquiring the traveling state of the vehicle and the traveling state acquired by the traveling state means. And a changing means for changing the transmission interval.

  As a seventeenth invention, a portable terminal used in the access notification system of the tenth invention, based on a terminal number acquiring means for acquiring the number of portable terminals in a predetermined area, and an acquisition result of the terminal number acquiring means The portable terminal is provided with the change means which changes the said transmission interval.

  According to the present invention, a communication channel can be effectively used.

  The best mode for carrying out the present invention will be described below.

[Outline of this approach notification system]
FIG. 17 is a diagram showing a configuration of an embodiment of the approach notification system of the present invention. As shown in FIG. 17, this approach notification system has the vehicle-mounted apparatus 10 which is embodiment of this invention, and the portable terminal 12 which is embodiment of this invention which a pedestrian possesses. The approach notification system notifies the vehicle (driver) side and / or the owner side of the portable terminal 12 that a vehicle carrying the vehicle-mounted device 10 and a pedestrian carrying the portable terminal 12 are approaching each other. Is. A person who rides a motorcycle such as a light vehicle including a bicycle or a motor-driven bicycle may carry the portable terminal 12. Further, specific examples of the mobile terminal 12 include a mobile phone and a personal digital assistance (PDA) in terms of being portable.

  5 and 6 are diagrams for explaining the outline of the embodiment of the approach notification system of the present invention. 5 and 6 show a situation in which the vehicle is approaching a pedestrian carrying the mobile terminal 12. A vehicle-mounted device 10 is mounted on the vehicle, and a pedestrian has a portable terminal 12. Reference numeral 27 denotes a pedestrian presence information provision area. Although details will be described later, the in-vehicle device 10 identifies the pedestrian presence information provision area 27 according to a predetermined condition, and determines that there is a pedestrian who has the mobile terminal 12 in the pedestrian presence information provision area 27. In this case, the driver of the vehicle and / or the owner of the portable terminal 12 is notified that they are approaching each other. Reference numeral 103 denotes an area where the transmission wave of the vehicle-mounted device 10 can reach (hereinafter referred to as “vehicle-mounted device transmission wave arrival area 103”). Reference numeral 111 denotes a terminal transmission interval normal area, and 112 denotes a terminal transmission interval adjustment area (band-shaped portion). Although details will be described later, the range of the terminal transmission interval normal area 111 changes according to the traveling state of the vehicle, and the range of the terminal transmission interval adjustment area 112 also changes as the range of the terminal transmission interval normal area 111 changes.

  As shown in FIG. 5, when the mobile terminal 12 enters the in-vehicle device transmission wave arrival area 103 due to the approach of a pedestrian carrying the vehicle and the mobile terminal 12 that are separated from each other (in the terminal transmission interval adjustment area 112 Then, the portable terminal 12 can receive the activation signal transmitted by the in-vehicle device 10. The mobile terminal 12 that has received the activation signal starts radio wave transmission for the vehicle-mounted device 10 to detect its presence. The transmission wave of the portable terminal 12 is transmitted intermittently with a predetermined constant output. At this time, the mobile terminal 12 transmits at an interval (for example, 100 ms) longer than the normal transmission interval. The transmission wave of the mobile terminal 12 is received by the in-vehicle device 10. Thereby, the vehicle-mounted device 10 can grasp the presence of a pedestrian who has the mobile terminal 12.

  Then, as shown in FIG. 6, the vehicle-mounted device 10 that has detected that the mobile terminal 12 has entered the terminal transmission interval normal area 111 as a result of further approach of the pedestrian carrying the vehicle and the mobile terminal 12 is normally The portable terminal 12 that has been transmitting at an interval longer than the transmission interval is instructed to set the transmission interval to a normal interval. The portable terminal 12 changes to a normal transmission interval (for example, 50 ms) according to the instruction.

[Configuration of Mobile Terminal 12 of First Example]
FIG. 11 is a block diagram of the mobile terminal 12 of the first example. The portable terminal 12 has an antenna 6 for transmitting / receiving radio waves having a predetermined frequency (for example, 2.4 GHz) to / from the outside. The receiving unit 7 receives a radio wave (that is, a carrier) transmitted by the vehicle-mounted device 10 via the antenna 6 (hereinafter, the radio wave transmitted by the vehicle-mounted device 10 is referred to as “vehicle-mounted device transmission wave”).

  The ID addition / detection unit 8 detects an activation signal from information obtained by the reception unit 7 demodulating the vehicle-mounted device transmission wave. In principle, the ID addition / detection unit 8 that has detected the activation signal adds the terminal ID given to each mobile terminal 12 to the transmission data, and the transmission unit 5 performs modulation and the presence of the mobile terminal 12 via the antenna 6. Start radio wave transmission to detect. Hereinafter, the radio wave transmitted by the mobile terminal 12 via the antenna 6 is referred to as “terminal transmission wave”. The terminal transmission wave is intermittently transmitted at a predetermined constant output.

  The ID adding / detecting unit 8 detects an ID from information obtained by the receiving unit 7 demodulating the vehicle-mounted device transmission wave. When the terminal ID is included in the ID detected by the ID addition / detection unit 8, it is known that the vehicle is approaching the pedestrian carrying the mobile terminal 12 via the information providing unit 9. Is done. That is, in order for the vehicle-mounted device 10 that has received the terminal transmission wave including the terminal ID to inform the mobile terminal 12 that has the terminal ID that the vehicle is approaching, the vehicle approach including the terminal ID is performed. The in-vehicle device transmission wave is transmitted as information. If the terminal ID is included, the information providing unit 9 provides the pedestrian that the vehicle is approaching by voice information, visual display information, vibration, or the like. The vehicle-mounted device transmission wave transmitted by the vehicle-mounted device 10 includes vehicle ID information given to each vehicle-mounted device 10 or each vehicle on which the vehicle-mounted device 10 is mounted so that the transmission source can be specified. May be.

  On the other hand, the reception level corresponding transmission interval adjustment unit 3c receives an in-vehicle device transmission wave instructing setting of a transmission interval of the terminal transmission wave, and if the in-vehicle device transmission wave includes its own terminal ID, the instruction The transmission interval of the terminal transmission wave is set according to That is, the in-vehicle device 10 that has received the terminal transmission wave including the terminal ID includes the terminal ID in order to instruct the portable terminal 12 having the terminal ID to set the transmission interval of the terminal transmission wave. The in-vehicle device transmission wave is instructed to set the transmission interval of the terminal transmission wave. The reception level corresponding transmission interval adjustment unit 3c detects a reception level indicating the reception sensitivity of the in-vehicle device transmission wave received by the reception unit 7 via the antenna 6, and the transmission interval of the terminal transmission wave according to the reception level. Adjust.

[Configuration of the in-vehicle device 10 of the first example]
FIG. 7 is a block diagram of the in-vehicle device 10 of the first example. The in-vehicle device 10 has an antenna 14 for transmitting / receiving radio waves having a predetermined frequency to / from the outside. The receiving unit 16 receives radio waves from the mobile terminal 12 received by the antenna 14 and acquires the ID of the mobile terminal 12 in the received data. The reception level detection unit 18 connected to the reception unit 16 detects a reception level indicating the reception sensitivity of the radio wave received by the reception unit 16. A direction / distance estimation unit 20 is connected to the reception level detection unit 18. Information on the reception level detected by the reception level detection unit 18 is supplied to the direction / distance estimation unit 20.

  A directivity control unit 22 that controls the directivity of the antenna 14 is connected to the direction / distance estimation unit 20. The direction / distance estimator 20 sends azimuth direction information to be received to the vehicle. The directivity control unit 22 switches the directivity of the antenna 14 according to the azimuth angle direction supplied from the direction / distance estimation unit 20. The direction / distance estimating unit 20 possesses the radio wave arrival direction and distance, that is, the portable terminal 12 when receiving levels are received from the reception level detecting unit 18 by switching the directivity of the antenna 14. Estimate the direction in which the person is present and the distance to that person. For example, when the reception level of the terminal transmission wave when the directivity of the antenna 14 is switched to one direction among the reception levels of the terminal transmission wave when the directivity of the antenna 14 is switched in each direction is maximum. The direction / distance estimating unit 20 estimates that there is a pedestrian carrying the mobile terminal 12 in one direction, and sets the reception level value of the terminal transmission wave when the directivity of the antenna 14 is switched to the one direction. It is estimated that a pedestrian possessed by the portable terminal 12 exists at a point separated by a corresponding distance. Since the value of the reception level of the terminal transmission wave changes according to the distance between the vehicle and the portable terminal 12, the direction / distance estimation unit 20 is a map value that defines the relationship between the value of the reception level of the terminal transmission wave and the distance. The distance to the pedestrian carrying the mobile terminal 12 is estimated using the above. In addition, the directivity control unit 22 can be controlled to emit radio waves toward the estimated direction of the mobile terminal 12. Furthermore, the directivity control unit 22 sets a region where radio waves are transmitted based on vehicle speed, turn signal information, and navigation information, which will be described later. In addition, in order to set a region where radio waves are transmitted, the directivity of the antenna 14 may be controlled, or a plurality of antennas having different directivity directions may be selectively switched. Good.

  As described above, the terminal transmission wave may be received by controlling the directivity of the antenna 14 to estimate the direction in which the person holding the mobile terminal 12 is present and the distance to the person. The direction in which the person holding the mobile terminal 12 is present by receiving the in-vehicle device transmission wave from the antenna 14 having the directivity of the in-vehicle device 10 by the mobile terminal 12 and returning the reception level to the in-vehicle device 10. And the distance to the person may be estimated. That is, the gain of the directional antenna is high only in a specific direction, and the gain of the omnidirectional antenna is constant in almost all directions, and the direction in which the mobile terminal is present can be determined using the difference. The vehicle cannot grasp where the mobile terminal 12 is located with respect to the vehicle only by receiving the terminal transmission wave via the omnidirectional antenna. This is because if the distance from the vehicle is the same, the reception level is the same even if the location is different. However, when the vehicle transmits radio waves via a directional antenna having a high gain only in a specific direction, the reception level when the portable terminal 12 existing in the direction having the directivity receives the in-vehicle unit transmission wave is The mobile terminal 12 that does not exist in the direction having the directivity becomes higher than the reception level when the in-vehicle device transmission wave is received. Therefore, by comparing the reception level of the terminal transmission wave received by the vehicle via the omnidirectional antenna and the reception level of the in-vehicle device transmission wave transmitted by the vehicle via the directional antenna on the portable terminal 12 side, The direction in which the terminal 12 exists can be determined. In order to specify the direction in which the mobile terminal 12 is present in more detail, it is preferable to compare the reception level of the terminal transmission wave on the vehicle side with the maximum value of the reception level of the in-vehicle device transmission wave on the mobile terminal 12 side. And the presence position of the portable terminal 12 can be estimated based on the reception level on the portable terminal 12 side of the in-vehicle device transmission wave having directivity in the direction where the portable terminal 12 exists.

  An information provision determination unit 24 is also connected to the direction / distance estimation unit 20. Information on the presence direction and distance of the person holding the mobile terminal 12 estimated by the direction / distance estimation unit 20 is sent to the information provision determination unit 24. The information provision determination unit 24 includes information on the speed (vehicle speed) of the host vehicle detected using a vehicle speed sensor, vehicle turn signal information detected using a turn signal indicator, and a navigation system mounted on the vehicle. Navigation information such as road shape, road width, intersection shape, and lane number information in the vicinity of the current position of the vehicle detected by using the vehicle (particularly in the forward direction) is supplied. The navigation information is stored in advance in the map database of the navigation system.

  A pedestrian presence information provision area table 26 is connected to the information provision determination unit 24. In the pedestrian presence information provision area table 26, information on a pedestrian presence information provision area in which different areas are set using vehicle speed, turn signal information, and navigation information as parameters is written in advance. Based on the acquired vehicle speed, turn signal information, and navigation information, the information provision determination unit 24 selects a pedestrian presence information provision area corresponding to the vehicle speed, turn signal information, and navigation information from the pedestrian presence information provision area table 26. Whether or not there is a person who possesses the portable terminal 12 in the read pedestrian presence information providing area based on the direction and distance of the person sent from the direction / distance estimating unit 20 after reading. Is determined. In addition, the pedestrian presence information provision area information is not previously stored in the pedestrian presence information provision area table 26, but the pedestrian presence information provision areas corresponding to these parameters are sequentially derived according to a predetermined calculation formula. May be.

  The information providing determination unit 24 is connected to an information providing unit 28 that visually or audibly provides information to the driver of the host vehicle using a display or a speaker. When it is determined that a person is present in the pedestrian presence information provision area, the information provision determination unit 24 provides an instruction for notifying the vehicle driver that the person is present in the pedestrian presence information provision area. This is performed for the providing unit 28. When the information providing unit 28 receives an instruction to provide information from the information providing determining unit 24, the information providing unit 28 operates a display or a speaker, so that a person exists in the pedestrian presence information providing area for the own vehicle and the own vehicle is Inform the vehicle driver that there is a potential for human contact.

  The information provision determination unit 24 is further connected to a transmission unit 30 that transmits information for notifying the mobile terminal 12 of the approach of the vehicle. When it is determined that there is a person in the pedestrian presence information provision area, the information provision determination unit 24 is in the pedestrian presence information provision area from the ID of the portable terminal 12 acquired by the reception unit 16. An instruction for transmitting the ID of the portable terminal 12 is given to the transmission unit 30. When receiving the ID transmission instruction, the transmitting unit 30 transmits the ID of the portable terminal 12 in the pedestrian presence information providing area from the antenna 14 on the radio wave.

  On the other hand, the terminal transmission interval adjustment unit 116 acquires the vehicle speed, the blinker information, and the navigation information in the vicinity of the current position of the host vehicle from the information provision determination unit 24 as the traveling state of the host vehicle, and the terminal transmission wave based on the acquisition result. The transmission unit 30 is instructed to transmit an in-vehicle device transmission wave instructing the setting of the transmission interval.

  A terminal transmission interval table 115 is connected to the terminal transmission interval adjustment unit 116. In terminal transmission interval table 115, information on terminal transmission interval normal area 111 (see FIGS. 5 and 6) in which different areas are set using vehicle speed, turn signal information, and navigation information as parameters is written in advance. The terminal transmission interval adjusting unit 116 reads the terminal transmission interval normal area 111 corresponding to the vehicle speed, the blinker information, and the navigation information from the terminal transmission interval table 115 based on the acquired vehicle speed, blinker information, and navigation information regarding the acquired own vehicle. At the same time, based on the direction and distance of the person who owns the portable terminal 12 estimated by the direction / distance estimation unit 20, there is a person who possesses the portable terminal 12 in the read terminal transmission interval normal area 111. It is determined whether or not there is a person possessing the mobile terminal 12 in the terminal transmission interval adjustment area 112 sandwiched between the in-vehicle device transmission wave arrival area 103 and the terminal transmission interval normal area 111. The terminal transmission interval normal area 111 may not be previously stored in the terminal transmission interval table 115, but the terminal transmission interval normal area 111 corresponding to these parameters may be sequentially derived according to a predetermined calculation formula. .

  When the terminal transmission interval adjustment unit 116 determines that the owner of the mobile terminal 12 is in the transmission interval normal area 111, the terminal transmission interval adjustment unit 116 transmits an in-vehicle transmission wave instructing to set the transmission interval of the terminal transmission wave to a normal value. The transmitter 30 is instructed to do so. On the other hand, if it is determined that the mobile terminal 12 is in the transmission interval adjustment area 112, it is determined that the necessity of notification is lower than that in the case where the owner of the mobile terminal 12 is in the transmission interval normal area 111. The transmission unit 30 is instructed to transmit the in-vehicle device transmission wave instructed to set the transmission interval of the transmission wave to a predetermined value longer than the normal value.

  Upon receiving the above instruction from the terminal transmission interval adjustment unit 116, the transmission unit 30 gives the ID of the mobile terminal 12 determined to be in the transmission interval normal area 111 via the antenna 14, and then transmits the terminal transmission wave. An in-vehicle device transmission wave instructing to set the transmission interval to a normal value is transmitted, and after giving the ID of the mobile terminal 12 determined to be in the transmission interval adjustment area 112, the transmission interval of the terminal transmission wave is set from the normal value. An in-vehicle device transmission wave of an instruction to set a long predetermined value is transmitted.

  In addition, what is necessary is just to set the above-mentioned pedestrian presence information provision area 27 and the transmission interval normal area 111 similarly to the setting method of the alarm area disclosed by Unexamined-Japanese-Patent No. 2005-202893.

[Operation of vehicle-mounted device 10 of the first example]
FIG. 8 is a flowchart showing the operation of the terminal transmission interval adjustment unit 116 of the in-vehicle device 10 of the first example. The terminal transmission interval adjustment unit 116, via the information provision determination unit 24, the position information (direction and distance) of the pedestrian who is the owner of the mobile terminal 12, and the vehicle running state, vehicle speed, turn signal information, and navigation information. Are acquired (step 10). The terminal transmission interval adjustment unit 116 refers to the terminal transmission interval table 115 and reads the terminal transmission interval normal area 111 corresponding to the vehicle speed, the blinker information, and the navigation information regarding the host vehicle (step 11). The terminal transmission interval adjustment unit 116 determines whether or not a pedestrian carrying the mobile terminal 12 is present in the transmission interval normal area 111 (step 12). When it is determined that the transmission interval exists in the normal area 111, the transmission unit 30 is instructed to transmit the in-vehicle transmission wave instructed to set the transmission interval of the terminal transmission wave to the normal value T1 (step 13). . On the other hand, when it is determined that the transmission interval does not exist in the transmission interval normal area 111 but in the transmission interval adjustment area 112, the transmission wave 30 is transmitted to transmit the in-vehicle device transmission wave instructed to set the transmission interval T2 longer than the normal value T1. A command is issued (step 14).

  Note that the transmission interval pattern of the terminal transmission wave can be increased by subdividing the transmission interval adjustment area 112 and changing the transmission interval stepwise instead of the two patterns.

[Operation of Mobile Terminal 12 of First Example]
Therefore, the reception level corresponding transmission interval adjustment unit 3c of the mobile terminal 12 of the first example shown in FIG. 11 receives the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave, and receives the in-vehicle device transmission wave. If its own terminal ID is included, the transmission interval of the terminal transmission wave is set according to the instruction.

  At this time, the reception level corresponding transmission interval adjustment unit 3c detects the reception level indicating the reception sensitivity of the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave, and transmits the terminal transmission wave according to the reception level. The interval may be adjusted. This is because the degree of approach between the in-vehicle device 10 and the mobile terminal 12 can be estimated by the magnitude of the reception level. It can be considered that the vehicle-mounted device 10 and the portable terminal 12 are closer as the reception level increases. The in-vehicle device 10 instructs the setting of the transmission interval of the terminal transmission wave, but the mobile terminal 12 that actually transmits the terminal transmission wave adjusts the transmission interval of the terminal transmission wave in consideration of the reception level of the in-vehicle device transmission wave. By doing so, it is possible to change or correct the transmission interval of the terminal transmission wave that more accurately reflects the actual approach state between the in-vehicle device 10 and the mobile terminal 12. An appropriate terminal transmission wave transmission interval contributes to efficient use of the channel.

  FIG. 12 is a flowchart showing the operation of the reception level corresponding transmission interval adjustment unit 3c of the mobile terminal 12 of the first example. The reception level corresponding transmission interval adjusting unit 3c determines whether or not the vehicle-mounted device transmission wave transmitted by the vehicle-mounted device 10 has been received (step 33). When the vehicle-mounted device transmission wave is received, it is determined whether or not the reception level is higher than a predetermined determination value H2 (step 34). If larger than the determination value H2, the transmission unit 5 is instructed to transmit the transmission interval of the terminal transmission wave at the normal value T1 (or a predetermined adjustment value of T1) (step 35), and the determination value H2 If not, the transmission unit 5 is instructed to transmit at a transmission interval T2 (or a predetermined adjustment value of T2) longer than the normal value T1 (step 36).

[Configuration of Onboard Device 10 of Second Example]
By the way, in the in-vehicle device 10 of the first example, the terminal transmission interval adjusting unit 116 acquires the vehicle speed, the blinker information, and the navigation information in the vicinity of the current position of the own vehicle from the information provision determining unit 24 as the traveling state of the own vehicle. Based on the acquisition result, the transmission unit 30 is instructed to transmit the vehicle-mounted device transmission wave that instructs the setting of the transmission interval of the terminal transmission wave. The in-vehicle device 10 of the second example instructs the transmission unit 30 to transmit the in-vehicle device transmission wave that instructs setting of the transmission interval of the terminal transmission wave according to the vehicle speed. When the vehicle speed decreases, the approaching speed to the person holding the mobile terminal 12 also decreases. Therefore, when the vehicle speed is low, it can be said that there is a low need for notifying the person who has the mobile terminal 12 of the approach of the vehicle. In such a case, the terminal transmission wave from the mobile terminal 12 to the vehicle-mounted device 10 By changing the transmission interval to a longer time, the frequency of channel occupancy decreases and the channel is effectively used. For example, when the vehicle is traveling at a low speed or the vehicle speed is zero (that is, in a parked / stopped state), it is less necessary to notify the person who has the mobile terminal 12 of the approach of the vehicle.

  FIG. 13 is a block diagram of the in-vehicle device 10 of the second example. The description of the same reference numerals as those in FIG. 7 is omitted or simplified. The vehicle speed compatible terminal transmission interval adjustment unit 401 acquires the vehicle speed from a vehicle speed sensor, another ECU, or the like. The transmitter 30 is instructed to transmit a vehicle-mounted device transmission wave that instructs setting of a transmission interval of the terminal transmission wave according to the acquired vehicle speed. The vehicle speed compatible terminal transmission interval adjustment unit 401 instructs the transmission unit 30 to transmit an in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to a normal value when the vehicle speed is faster than a predetermined value. When the vehicle speed is equal to or lower than the predetermined value, the transmission unit 30 is instructed to transmit the in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to a predetermined value longer than the normal value.

  Upon receiving the above command from the vehicle speed compatible terminal transmission interval adjustment unit 401, the transmission unit 30 gives the ID of the mobile terminal 12 existing in the traveling direction of the vehicle estimated by the direction / distance estimation unit 20 via the antenna 14. After that, an in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to a normal value is transmitted and exists in the traveling direction of the vehicle estimated by the direction / distance estimation unit 20 (or may be omnidirectional). After giving the ID of the portable terminal 12, an in-vehicle device transmission wave for instructing to set the transmission interval of the terminal transmission wave to a predetermined value longer than the normal value is transmitted.

[Operation of vehicle-mounted device 10 of the second example]
FIG. 14 is a flowchart showing the operation of the vehicle speed compatible terminal transmission interval adjustment unit 401 of the in-vehicle device 10 of the second example. The vehicle speed corresponding terminal transmission interval adjustment unit 401 acquires vehicle speed information v (step 40), and determines whether the vehicle speed v is faster than a predetermined determination value V (step 41). When it is determined that the vehicle speed v is faster than the predetermined determination value V, the transmission unit 30 is instructed to transmit the in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to the normal value T1 (step) 42). On the other hand, when it is determined that the vehicle speed v is not faster than the predetermined determination value V, the transmission wave 30 is instructed to transmit the vehicle-mounted transmission wave instructed to set the transmission interval T2 longer than the normal value T1 ( Step 43).

  Therefore, as described above, the mobile terminal 12 receives the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave, and if the in-vehicle device transmission wave includes its own terminal ID, the instruction The transmission interval of the terminal transmission wave is set according to Similarly, the reception level indicating the reception sensitivity of the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave may be detected, and the transmission interval of the terminal transmission wave may be adjusted according to the reception level.

  Note that the transmission interval pattern of the terminal transmission wave can be increased by subdividing and changing the vehicle speed as the threshold value in stages instead of the two patterns. Alternatively, the mobile terminal 12 may acquire the traveling state (vehicle speed or the like) of the vehicle through communication with the in-vehicle device 10, and the mobile terminal 12 itself may change the transmission interval according to the vehicle speed.

[Configuration of the in-vehicle device 10 of the third example]
By the way, the in-vehicle device 10 of the second example instructs the transmission unit 30 to transmit the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave according to the vehicle speed. The in-vehicle device 10 of the third example transmits a terminal transmission wave according to the number of mobile terminals 12 communicating with itself (or the density in a predetermined area of the mobile terminal 12 communicating with itself). The transmission unit 30 is instructed to transmit an in-vehicle device transmission wave that instructs setting of the interval. If the transmission interval from the mobile terminal 12 to the in-vehicle device 10 can be increased when there are many mobile terminals 12 and the transmission to the in-vehicle device 10 is concentrated, the channel occupation frequency per mobile terminal 12 is reduced and the channel is effective. Be utilized.

  FIG. 15 is a block diagram of the in-vehicle device 10 of the third example. The description of the same reference numerals as those in FIG. 7 is omitted or simplified. The terminal density-compatible transmission interval adjustment unit 501 transmits to the transmission unit 30 so as to transmit the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave according to the number of mobile terminals 12 communicating with itself. Command. The terminal density corresponding transmission interval adjusting unit 501 can grasp the number of mobile terminals 12 that are communicating by counting the terminal ID included in the terminal transmission wave received by the receiving unit 16. It can be considered that all the mobile terminals 12 having terminal IDs included in the terminal transmission wave received by the receiving unit 16 are present in the in-vehicle device transmission wave arrival area 103. Note that the mobile terminals 12 to be counted may be limited to the mobile terminals 12 in the terminal transmission interval adjustment area 112 described above. When the number of mobile terminals 12 communicating with itself is smaller than a predetermined value, the terminal density corresponding transmission interval adjusting unit 501 transmits an in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to a normal value. The in-vehicle device instructing the transmission unit 30 to set the transmission interval of the terminal transmission wave to a predetermined value longer than the normal value when the number of mobile terminals 12 communicating with itself is equal to or greater than the predetermined value The transmission unit 30 is instructed to transmit the transmission wave.

  The transmission unit 30 that has received the above instruction from the terminal density-compatible transmission interval adjustment unit 501 gives the ID of the portable terminal 12 existing in the traveling direction of the vehicle estimated by the direction / distance estimation unit 20 via the antenna 14. After that, an in-vehicle device transmission wave instructing to set the transmission interval of the terminal transmission wave to a normal value is transmitted and exists in the traveling direction of the vehicle estimated by the direction / distance estimation unit 20 (or may be omnidirectional). After giving the ID of the portable terminal 12, an in-vehicle device transmission wave for instructing to set the transmission interval of the terminal transmission wave to a predetermined value longer than the normal value is transmitted.

[Operation of the in-vehicle device 10 of the third example]
FIG. 16 is a flowchart showing the operation of the terminal density corresponding transmission interval adjusting unit 501 of the in-vehicle device 10 of the third example. The terminal density corresponding transmission interval adjusting unit 501 resets the elapsed time t2 and the number of terminals h to zero (step 51), and determines whether or not the terminal transmission wave transmitted by the mobile terminal 12 has been received (step 52). When the terminal transmission wave is received, the number of portable terminals 12 is counted based on the terminal ID (step 53). And until the elapsed time t2 exceeds the predetermined measurement time Ta, the counting of the portable terminal 12 is continued based on the terminal ID of the received terminal transmission wave (step 54). When t2 passes Ta, the process proceeds to step 55. That is, the number of terminal IDs received per unit time, that is, the number of mobile terminals 12 is counted. The terminal density-corresponding transmission interval adjusting unit 501 determines whether the number of terminals h is smaller than a predetermined determination value H3 when t2 has elapsed Ta (step 55). When the number h of terminals is smaller than the predetermined determination value H3, the transmission unit 30 is instructed to transmit the in-vehicle transmission wave instructed to set the transmission interval of the terminal transmission wave to the normal value T1 (step 56). . On the other hand, if the number h of terminals is not smaller than the predetermined determination value H3, the transmission wave 30 is instructed to transmit the vehicle-mounted transmission wave instructed to set the transmission interval T2 longer than the normal value T1 (step 57). ).

  Therefore, as described above, the mobile terminal 12 receives the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave, and if the in-vehicle device transmission wave includes its own terminal ID, the instruction The transmission interval of the terminal transmission wave is set according to Similarly, the reception level indicating the reception sensitivity of the in-vehicle device transmission wave instructing the setting of the transmission interval of the terminal transmission wave may be detected, and the transmission interval of the terminal transmission wave may be adjusted according to the reception level.

  Note that the number of transmission intervals of terminal transmission waves can be increased by subdividing and changing the number of mobile terminals 12 and the measurement time Ta as threshold values instead of two patterns. Alternatively, the mobile terminal 12 may acquire the number of mobile terminals with which the in-vehicle device 10 communicates by communicating with the in-vehicle device 10, and the mobile terminal 12 itself may change the transmission interval according to the number of mobile terminals.

[Configuration of Mobile Terminal 12 of Second Example]
By the way, the information of the nearby mobile terminals 12 is collectively transmitted to the in-vehicle device 10, so that channels can be saved as compared with the case where each individual mobile terminal 12 transmits, and the channels can be used more effectively. Therefore, it is preferable that when a plurality of mobile terminals 12 are close to each other, a proximity terminal group is formed, and one mobile terminal 12 performs transmission to the in-vehicle device 10 as a representative terminal of the proximity terminal group.

  In this case, each mobile terminal 12 has an ID for identifying the mobile terminal 12, and the representative terminal acquires the ID of another mobile terminal 12 belonging to the same proximity terminal group as the mobile terminal 12, and the in-vehicle device together with its own ID. 10, the in-vehicle device 10 preferably returns the ID of the portable terminal 12 that should notify the approach of the vehicle. Thereby, even if the portable terminal 12 other than the representative terminal does not transmit to the in-vehicle device 10 by itself, the portable terminal 12 other than the representative terminal determines whether the ID returned by the in-vehicle device 10 has its own ID. It becomes possible to determine whether or not the terminal itself should inform the terminal owner of the approach of the vehicle.

  1 and 2 are diagrams for explaining an outline of the mobile terminal 12 of the second example of the approach notification system of the present invention. 1 and 2 show a situation in which the vehicle is approaching two pedestrians carrying the mobile terminal 12. The vehicle is equipped with an in-vehicle device 10, and one pedestrian has a portable terminal 12a, and the other pedestrian has a portable terminal 12b.

  102 shown in FIGS. 1 and 2 is an area where the transmission wave of the mobile terminal 12a can reach (hereinafter, referred to as “terminal 12a transmission wave arrival area 102”). 101 shown in FIG. 1 is an area where the transmission wave of the mobile terminal 12a is stronger than a predetermined threshold in the terminal 12a transmission wave arrival area 102 (hereinafter referred to as “terminal 12a transmission wave strong area 101”). 2 is an area where the transmission wave of the mobile terminal 12b can reach (hereinafter referred to as “terminal 12b transmission wave arrival area 104”).

  As shown in FIG. 1, when the mobile terminal 12 a enters the in-vehicle device transmission wave arrival area 103 due to the approach of a pedestrian carrying the vehicle and the mobile terminal 12 a that are separated from each other, the mobile terminal 12 a 10 receives the activation signal transmitted, and the vehicle-mounted device 10 starts transmitting radio waves for detecting the position of the pedestrian. The transmission wave of the mobile terminal 12 a that has received the activation signal is received by the in-vehicle device 10 in the terminal 12 a transmission wave arrival area 102. As a result, the in-vehicle device 10 can grasp the presence of a pedestrian carrying the mobile terminal 12a.

  On the other hand, since the mobile terminal 12b in the terminal 12a transmission wave strong area 101 in the vicinity of the mobile terminal 12a is far from the vehicle as compared with the mobile terminal 12a, the mobile terminal 12a receives the strong radio wave from the mobile terminal 12a. A transmission wave is received. At this time, the mobile terminal 12b that has received a strong radio wave from the mobile terminal 12a transmits a radio wave that is weak enough to reach the mobile terminal 12a in order to inform the mobile terminal 12a that it is nearby. Thereby, the portable terminal 12a in the terminal 12b transmission wave arrival area 104 can grasp the presence of the portable terminal 12b. The mobile terminal 12a that has grasped the presence of the mobile terminal 12b transmits to the in-vehicle device 1 by including in the transmission data that the mobile terminal 12b is present in the vicinity as well as the presence of the mobile terminal 12b.

  As shown in FIG. 2, when the mobile terminal 12a enters the pedestrian presence information providing area 27 by further approaching the pedestrian carrying the vehicle and the mobile terminal 12a, the presence of the mobile terminals 12a and 12b is confirmed. The grasped vehicle-mounted device 10 is informed that the vehicle and the pedestrian are approaching not only to the pedestrian carrying the portable terminal 12b but also to the pedestrian carrying the portable terminal 12a. provide. Note that each mobile terminal 12 possessed by a pedestrian and the vehicle-mounted device 10 mounted on each vehicle can be distinguished by adding their IDs to the transmission wave.

  Thereby, when the some portable terminal 12 has gathered, the portable terminal 12 which needs to communicate with the vehicle equipment 10 directly can be made into one. Moreover, the transmission output of the portable terminal 12 when the portable terminals 12 that are close to each other communicate with each other should be lower than the transmission output of the portable terminal 12 when the remote vehicle-mounted device 10 and the portable terminal 12 communicate with each other. Can do. As a result, the channel can be used more efficiently and power saving of the mobile terminal 12 can be achieved compared to the case where each of the mobile terminals 12 that are close to each other communicates directly with the in-vehicle device 10.

  FIG. 3 is a block diagram of the mobile terminal 12 of the second example. The description of the same reference numerals as those in FIG. 11 is omitted or simplified. The other terminal proximity determination unit 3a detects a reception level indicating the reception sensitivity of the terminal transmission wave of the other portable terminal 12 received by the receiving unit 7 via the antenna 6, and the other portable terminal 12 is based on the received level. The approaching state is determined. The other terminal proximity determination unit 3a is configured such that the receiving unit 7 receives a strong terminal transmission wave of another portable terminal 12 (receives a terminal transmission wave of another portable terminal 12 having a predetermined reception level or higher), and a receiving unit When 7 receives the in-vehicle device transmission wave, in order to inform the other mobile terminal 12 that it is nearby, proximity information indicating that it is close and its own terminal ID In addition, the transmission unit 5 and the ID addition / detection unit 8 are instructed to transmit to the other portable terminal 12 at a lower output than usual, and the in-vehicle unit that is the transmission source of the in-vehicle unit transmission wave The ID addition / detection unit 8 is instructed not to perform the transmission for 10. The transmission unit 5 transmits a terminal transmission wave obtained by modulating data in accordance with these instructions to other mobile terminals 12 with an output lower than normal.

  On the other hand, when the receiving unit 7 receives the proximity information, the other terminal proximity determining unit 3a adds not only its own terminal ID but also the terminal IDs of other mobile terminals 12 in the vicinity to the transmission data. 10 is instructed to the transmission unit 5 and the ID addition / detection unit 8 to transmit to the terminal 10. The transmission unit 5 transmits a terminal transmission wave, in which data is modulated in accordance with this instruction, to the in-vehicle device 10 with a normal output.

[Operation of Mobile Terminal 12 of Second Example]
FIG. 4 is a flowchart showing the operation of the other terminal proximity determination unit 3a of the mobile terminal 12 of the second example. The other terminal proximity determination unit 3a determines whether or not the terminal transmission wave transmitted from the other terminal 12 to the in-vehicle device 10 can be received (step 1). When the terminal transmission wave for the in-vehicle device 10 of the other terminal 12 can be received, it is determined whether or not the reception level R is higher than the reception level S that can be determined to be close (step 2). When the reception level R is larger than the determination value S, it is determined whether or not the in-vehicle device transmission wave transmitted by the in-vehicle device 10 in step 1 communicating with the other terminal 12 can be received (step 3). When the in-vehicle device transmission wave for the other terminal 12 of the in-vehicle device 10 can be received, it indicates that the other device 12 in the step 1 is in proximity to inform that the other device 12 is nearby. Instruct the transmission unit 5 and the ID addition / detection unit 8 to add the proximity information and its own terminal ID and transmit to the other terminal 12 at an output P lower than normal (step 4). The ID addition / detection unit 8 is instructed not to perform transmission to the in-vehicle device 10 (step 5).

  When it is determined No in the determination steps of Steps 1, 2, and 3, or after Step 5, the other terminal proximity determination unit 3 a determines whether or not the proximity information transmitted by the other terminal 12 can be received ( Step 6). When the proximity information transmitted by the other terminal 12 can be received, the terminal ID of the other terminal 12 related to the proximity information in Step 6 as well as its own terminal ID is added to the transmission data and transmitted to the in-vehicle device 10. The transmitter 5 and the ID addition / detection unit 8 are instructed to do so (step 7). On the other hand, when the proximity information transmitted by the other terminal 12 cannot be received, only the own terminal ID is added to the transmission data and transmitted to the in-vehicle device 10 so that the transmission unit 5 and the ID addition / detection unit 8 To instruct.

[Configuration of Third Mobile Terminal 12]
In FIGS. 1 and 2 described above, there are only two mobile terminals 12 that are close to each other, but assuming a situation where the number of mobile terminals 12 that are close exceeds a certain number, the mobile terminal 12 of the third example is shown. Will be described.

  The own mobile terminal 12 monitors whether or not the other mobile terminal 12 already communicating with the in-vehicle device 10 exists in the vicinity of the own mobile terminal 12. When the own mobile terminal 12 detects that there are a predetermined number N or more of other mobile terminals 12, it does not transmit to the in-vehicle device 10 with which the other mobile terminal 12 is communicating, Monitor. Then, when it can be detected from the communication contents that the information is provided from the in-vehicle device 10 to the nearest portable terminal 12 (the reception level is large) among the other portable terminals 12, the own portable terminal 12 Provides information to pedestrians as if they had received the information.

  As a result, if the number of adjacent mobile terminals 12 exceeds a certain number, radio waves may be congested between the adjacent mobile terminals 12, so that the mobile terminal 12 that has already communicated with the in-vehicle device 10 is the own mobile terminal. If the mobile terminal 12 exists near the mobile terminal 12, it is sufficient for the mobile terminal 12 to monitor the communication content between the mobile terminal 12 and the vehicle-mounted device 10 in the vicinity without transmitting radio waves.

  FIG. 9 is a block diagram of the mobile terminal 12 of the third example. The description of the same reference numerals as those in FIG. 11 is omitted or simplified. The proximity other terminal number determination unit 3b counts the number of other terminals 12 existing in the vicinity based on the communication content that can be received (for example, counts the received terminal ID), and the number of other terminals 12 is predetermined. When the number is larger than the value, the transmission unit 5 is instructed not to perform transmission to the in-vehicle device 10 with which the other terminal 12 is communicating. In addition, the proximity other terminal number determination unit 3b detects a reception level indicating the reception sensitivity of the terminal transmission wave of the other portable terminal 12 received by the reception unit 7 via the antenna 6, and based on the reception level, By determining the approaching state with the portable terminal 12, the other terminal 12 closest to itself is specified. When the proximity other terminal number determination unit 3b can detect from the communication content that the information is provided from the in-vehicle device 10 to the nearest portable terminal 12 (the reception level is large) among the other portable terminals 12 The ID addition / detection unit 8 is instructed to determine the provision of information by replacing the information content with the information content to itself. The ID addition / detection unit 8 that has received the instruction indicates that the vehicle is approaching via the information providing unit 9 when the terminal ID of the nearest mobile terminal 12 among the other mobile terminals 12 is detected. The owner will be informed.

[Operation of Mobile Terminal 12 of Third Example]
FIG. 10 is a flowchart illustrating the operation of the proximity other terminal number determination unit 3b of the mobile terminal 12 of the third example. The adjacent other terminal number determination unit 3b first resets the stored values of the elapsed time t, the number of other terminals n, the maximum reception level Rmax, and the maximum reception level terminal ID (step 21). And it is judged whether the terminal transmission wave which the other terminal 12 is transmitting with respect to the vehicle equipment 10 can be received (step 22). When the terminal transmission wave for the in-vehicle device 10 of the other terminal 12 can be received, it is determined whether or not the reception level R1 is equal to or higher than the determination value H1 for counting the number of the other terminals 12 in the vicinity (step 23). . When it is determined that the reception level R1 is equal to or higher than the determination value H1, the number n of the other terminals 12 that are close to each other is counted up (step 24). Then, it is determined whether or not R1 is larger than the stored value of the maximum reception level Rmax (step 25). That is, it is determined whether or not R1 is larger than the maximum reception level Rmax received so far. When R1 is larger than the stored value of the maximum reception level Rmax, the stored value of Rmax is rewritten to R1, and the terminal ID is stored (step 26). When it is determined No in the determination steps of Steps 22, 23, and 25, or after Step 26, Step 22 and subsequent steps are repeated until the elapsed time t becomes equal to or greater than the set value T of the transmission interval of the terminal transmission wave (Step 27). ). When the transmission interval T is exceeded, it is determined whether or not the number n of other terminals 12 is greater than or equal to a predetermined determination value N (step 28). If n is greater than or equal to the determination value N, the transmission unit 5 is instructed not to transmit the own terminal to the in-vehicle device 10 in step 22 assuming that there are many other terminals near the own terminal ( Step 29), instructing the ID addition / detection unit 8 to determine the provision of information, assuming that the information of the terminal ID stored in Step 26 is the information for the terminal itself (Step 30). .

  As described above, according to the approach notification system described above, the in-vehicle device 10, and the mobile terminal 12, as shown in FIG. 5, when the mobile terminal 12 is located outside the pedestrian presence information providing area 27 to some extent, the mobile terminal The transmission interval of 12 is longer than the normal transmission interval. And as FIG. 6 shows, when the portable terminal 12 approaches the pedestrian presence information provision area 27, the transmission interval of the portable terminal 12 becomes a normal transmission interval. In other words, since the necessity of notifying each other's approach to the owner of the portable terminal 12 or the driver changes according to the traveling state of the vehicle, it is determined that the necessity of notification is low depending on the traveling state of the vehicle (low speed traveling). By increasing the transmission interval of the terminal transmission wave (at the time of parking or stopping), the frequency of channel occupancy by the portable terminal 12 existing in a relatively less dangerous place is reduced, and the channel can be used efficiently. At the same time, the power saving effect of the portable terminal 12 increases as the transmission interval of the terminal transmission wave becomes longer. It can also be expected to suppress the occurrence of congestion.

  Moreover, according to the above-described approach notification system, the in-vehicle device 10 and the mobile terminal 12, the transmission interval of the terminal transmission wave can be adjusted according to the reception level of the transmission wave of the in-vehicle device 10 received by the mobile terminal 12. . As the reception level decreases, it is considered that the person holding the mobile terminal and the vehicle are far away from each other. Therefore, the necessity of notifying the person holding the mobile terminal of the approach of the vehicle is reduced. Therefore, by adjusting the direction in which the transmission interval from the mobile terminal 12 to the in-vehicle device 10 becomes longer as the reception level becomes smaller, the channel occupation frequency decreases and the channel can be used efficiently. At the same time, the power saving effect of the portable terminal 12 increases as the transmission interval of the terminal transmission wave becomes longer. It can also be expected to suppress the occurrence of congestion.

  Moreover, according to the above approach notification system, the in-vehicle device 10 and the mobile terminal 12, when the number of mobile terminals constituting the proximity terminal group is a predetermined number or more, the mobile terminal newly added to the proximity terminal group is the representative terminal. It is possible to obtain the ID of at least one mobile terminal in the proximity terminal group without performing transmission to the mobile terminal and compare the acquired ID with the ID returned by the in-vehicle device 10. Thereby, the mobile terminal newly added to the proximity terminal group composed of a large number of mobile terminals can determine whether or not the ID returned by the vehicle-mounted device 10 has the acquired ID even if the mobile terminal does not perform the transmission operation. Therefore, it is possible to determine whether or not the terminal should inform the terminal owner of the approach of the vehicle, so that the frequency of channel occupancy is reduced, the channel is effectively used, and power consumption can be suppressed.

  Moreover, according to the above approach notification system, the in-vehicle device 10 and the mobile terminal 12, the mobile terminal 12 determines the approach state with the representative terminal based on the reception level of the transmission wave of the representative terminal, and is in proximity. Since the proximity terminal group can be formed by transmitting the proximity information to the representative terminal when it is determined that the mobile terminal itself selects the representative terminal and determines the proximity state, other devices and equipment Compared to the case where the command is issued from the above, the proximity terminal group can be formed with a simple configuration.

  Further, according to the approach notification system described above, and the in-vehicle device 10 and the mobile terminal 12, communication between adjacent mobile terminals is performed at a lower output than communication between the in-vehicle device and the mobile terminal. Communication can be output to the extent that it does not reach the in-vehicle device, and interference between communication between adjacent mobile terminals and communication between the in-vehicle device and the mobile terminal can be suppressed. That is, if communication is performed between mobile terminals that are close to each other, it is less necessary to increase the output as it reaches the vehicle-mounted device. In addition, power consumption of the mobile terminal can be suppressed.

  Further, according to the approach notification system described above, the in-vehicle device 10 and the portable terminal 12, it is possible to notify only the pedestrian who has the portable terminal 12 existing in the pedestrian presence information providing area of the approach of the vehicle. The approach of the vehicle can not be notified to a pedestrian who has the portable terminal 12 existing outside the area. As a result, a pedestrian who needs to be notified of the approach of the vehicle can surely be notified of this, and a pedestrian who does not need much notification of the approach of the vehicle (particularly a position that is not related to the approach of the vehicle (for example, a straight-ahead vehicle) It is possible to reduce the annoyance felt by the pedestrian by the notification to the subject who is in the back).

  Furthermore, according to the above-described approach notification system, the in-vehicle device 10 and the mobile terminal 12, the presence of a pedestrian with respect to the vehicle driver only when there is a pedestrian carrying the mobile terminal 12 in the pedestrian presence information provision area. Information can be provided, and when there is no pedestrian carrying the mobile terminal 12 in the area, it is possible not to provide pedestrian presence information to the vehicle driver. As a result, when there is a pedestrian at a position that should be notified to the vehicle driver during vehicle driving, the vehicle driver can be surely notified of this, and the vehicle driver need not be informed so much. When there are pedestrians, it is possible to reduce the annoyance felt by the driver by providing the pedestrian presence information.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, the portable terminal 12 that has received the activation signal from the in-vehicle device 10 detects its own position by GPS or the like, and transmits the position information to the in-vehicle device 10, so that the in-vehicle device 10 possesses the portable terminal 12. You may estimate the position of a pedestrian. Therefore, the present invention determines whether or not it is dangerous based on the relative positional relationship between the pedestrian and the vehicle obtained by GPS or the like, and if it is determined to be dangerous, the driver side of the vehicle or the owner of the portable terminal 12 It is also applicable to a system that provides information to the side.

  Desirably, the information providing unit 9 of the mobile terminal 12 specifically notifies which vehicle is approaching from which direction as well as the fact of the approach. The information provision part 9 determines the content to alert | report based on the information contained in a vehicle equipment transmission wave.

  Further, the antenna 14 may be a directional antenna having directivity only in one direction in front of the vehicle, or may be a directional antenna having directivity in two directions in front of the vehicle and rear of the vehicle. As a result, even when the vehicle moves backward instead of when the vehicle moves forward, the pedestrian in the backward direction (that is, the traveling direction) can be informed of the presence of the vehicle, and the pedestrian can be notified to the driver. The presence of

  In the above embodiment, the road environment such as the road shape and the number of lanes is acquired based on the navigation information sent from the navigation system. It is good also as acquiring based on communication data by vehicle-to-vehicle communication, road-to-vehicle communication from infrastructure, communication with an information management center).

It is a figure for demonstrating the outline | summary of the portable terminal 12 of the 2nd example of the approach alerting | reporting system of this invention (the portable terminal 12a exists in the vehicle equipment transmission wave arrival area 103). It is a figure for demonstrating the outline | summary of the portable terminal 12 of the 2nd example of the approach alerting | reporting system of this invention (the portable terminal 12a exists in the pedestrian presence information provision area 27). It is a block diagram of the portable terminal 12 of the 2nd example. It is a flowchart which shows operation | movement of the other terminal proximity determination part 3a of the portable terminal 12 of a 2nd example. It is a figure for demonstrating the outline | summary of embodiment of the approach alerting | reporting system of this invention (the portable terminal 12 exists in the terminal transmission space | interval adjustment area 112). It is a figure for demonstrating the outline | summary of embodiment of the approach alerting | reporting system of this invention (the portable terminal 12 exists in the terminal transmission space | interval normal area 111). It is a block diagram of vehicle equipment 10 of the 1st example. It is a flowchart which shows operation | movement of the terminal transmission space | interval adjustment part 116 of the vehicle equipment 10 of a 1st example. It is a block diagram of the portable terminal 12 of the 3rd example. It is a flowchart which shows operation | movement of the proximity other terminal number determination part 3b of the portable terminal 12 of a 3rd example. It is a block diagram of the portable terminal 12 of a 1st example. It is a flowchart which shows operation | movement of the reception level corresponding | compatible transmission space | interval adjustment part 3c of the portable terminal 12 of a 1st example. It is a block diagram of the vehicle equipment 10 of the 2nd example. It is a flowchart which shows operation | movement of the vehicle speed corresponding | compatible terminal transmission space | interval adjustment part 401 of the vehicle equipment 10 of a 2nd example. It is a block diagram of the vehicle equipment 10 of the 3rd example. It is a flowchart which shows operation | movement of the transmission density adjustment part 501 corresponding to the terminal density of the vehicle equipment 10 of the 3rd example. It is the figure which showed one structure of embodiment of the approach alerting | reporting system of this invention.

Explanation of symbols

3a Other Terminal Proximity Determining Unit 3b Proximity Other Terminal Number Determining Unit 3c Reception Level Corresponding Transmission Interval Adjusting Unit 5 Transmitting Unit 6 Omni-Directional Antenna 7 Receiving Unit 8 ID Addition / Detection Unit 9 Information Providing Unit 10 In-vehicle Device 12, 12a, 12b Mobile terminal 14 Directional antenna 16 Reception unit 18 Reception level detection unit 20 Direction / distance estimation unit 22 Directionality control unit 24 Information provision determination unit 26 Pedestrian presence information provision area table 27 Pedestrian presence information provision area 28 Information provision unit 30 Transmission unit 101 Terminal 12a transmission wave strong area 102 Terminal 12a transmission wave arrival area 103 In-vehicle device transmission wave arrival area 104 Terminal 12b transmission wave arrival area 111 Terminal transmission interval normal area 112 Terminal transmission interval adjustment area 115 Terminal transmission interval table 116 Terminal transmission Interval adjustment unit 401 Vehicle speed compatible terminal transmission interval adjustment unit 5 01 Terminal density compatible transmission interval adjuster

Claims (17)

In the approach notification system capable of notifying that the vehicle and the person are approaching each other by the in-vehicle device receiving the transmission wave of the portable terminal carried by the person,
An approach notification system, wherein a transmission interval of the transmission wave is set based on a traveling state of a vehicle. The access notification system according to claim 1,
The traveling state is a vehicle speed,
An approach notification system that sets the transmission interval longer when the vehicle speed is low than when the vehicle speed is high. The access notification system according to claim 1 or 2,
An approach notification system that adjusts the transmission interval according to a reception level of a transmission wave of an in-vehicle device received by a mobile terminal. The access notification system according to any one of claims 1 to 3,
An approach notification system in which when a plurality of mobile terminals are close to each other, a proximity terminal group is formed, and one mobile terminal transmits to a vehicle-mounted device as a representative terminal of the proximity terminal group. The access notification system according to claim 4,
Each mobile device has an ID to identify it,
The representative terminal acquires the ID of another mobile terminal belonging to the same proximity terminal group as itself and transmits it to the in-vehicle device together with its own ID,
The in-vehicle device is an approach notification system that returns an ID of a portable terminal that should notify the approach of the vehicle. The access notification system according to claim 5,
A mobile terminal that newly joins the proximity terminal group when the number of mobile terminals constituting the proximity terminal group is equal to or greater than a predetermined number does not transmit to the representative terminal, and obtains the ID of at least one mobile terminal in the proximity terminal group An approach notification system that acquires and compares the acquired ID with the ID returned by the vehicle-mounted device. The access notification system according to any one of claims 4 to 6,
The representative terminal is an approach notification system that is a portable terminal that has previously communicated with the vehicle-mounted device. The access notification system according to any one of claims 4 to 7,
The mobile terminal determines the proximity state with the representative terminal based on the reception level of the transmission wave of the representative terminal, and when it is determined that the mobile terminal is close, the proximity terminal is formed by transmitting proximity information to the representative terminal. An approach notification system. The access notification system according to any one of claims 4 to 8,
An approach notification system in which communication between adjacent mobile terminals is performed at a lower output than communication between an in-vehicle device and a mobile terminal. In the approach notification system capable of notifying that the vehicle and the person are approaching each other by the in-vehicle device receiving the transmission wave of the portable terminal carried by the person,
An approach notification system characterized in that the transmission interval of the transmission wave is set longer when the number of mobile terminals in a predetermined area is larger than the predetermined number, compared to when the number is smaller. The access notification system according to claim 10,
An approach notification system that adjusts the transmission interval according to a reception level of a transmission wave of an in-vehicle device received by a mobile terminal. An in-vehicle device used in the approach notification system according to claim 1,
Traveling state detecting means for detecting the traveling state of the vehicle;
An in-vehicle device comprising: a traveling state transmission unit that transmits a traveling state detected by the traveling state detection unit to a portable terminal. An in-vehicle device used in the approach notification system according to claim 1,
Traveling state detecting means for detecting the traveling state of the vehicle;
An in-vehicle device comprising: command means for instructing a portable terminal to set the transmission interval based on a detection result of the traveling state detection means. An in-vehicle device used in the approach notification system according to claim 10,
Terminal number detecting means for detecting the number of mobile terminals in a predetermined area;
An in-vehicle device comprising: command means for instructing a portable terminal to set the transmission interval based on a detection result of the terminal number detection means. A portable terminal used in the approach notification system according to claim 1, 2 or 10,
A portable terminal comprising: changing means for changing the transmission interval in response to a command from an in-vehicle device. A portable terminal used in the approach notification system according to claim 1 or 2,
Traveling state acquisition means for acquiring the traveling state of the vehicle;
A portable terminal comprising: changing means for changing the transmission interval based on the running state acquired by the running state means. A portable terminal used in the approach notification system according to claim 10,
Terminal number acquisition means for acquiring the number of mobile terminals in a predetermined area;
A portable terminal comprising: a changing unit that changes the transmission interval based on an acquisition result of the terminal number acquiring unit.

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