WO2014034082A1

WO2014034082A1 - Terminal device

Info

Publication number: WO2014034082A1
Application number: PCT/JP2013/005027
Authority: WO
Inventors: 篤生岩瀬
Original assignee: パナソニック株式会社
Priority date: 2012-08-30
Filing date: 2013-08-26
Publication date: 2014-03-06
Also published as: JP2015207794A

Abstract

An RF unit (52) and a modulator/demodulator (54) broadcast a packet signal including first vehicle type information about a vehicle or a pedestrian carrying a terminal device (14), while receiving a packet signal from another terminal device that includes second vehicle type information about a vehicle or a pedestrian carrying the other terminal device. An application implementation unit (76) performs a process defined in accordance with a combination of the second vehicle type information included in the received packet signal and the first vehicle type information included in a packet signal to be transmitted, and, if a decision for performing notification is made, causes notification to be performed.

Description

Terminal device

The present invention relates to communication technology, and more particularly, to a terminal device that broadcasts a signal including predetermined information.

To prevent a car accident, for example, a rear-end collision, the distance between the vehicle traveling in front of the host vehicle is detected and a risk is determined. An alarm is issued for this. For example, it is determined to be dangerous when the inter-vehicle distance becomes small and when the relative speed becomes small (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-83998 JP 2006-182207 A JP 2010-259103 A

衝突 Collision accidents include not only passenger cars but also large cars, bicycles, pedestrians (hereinafter referred to as “vehicles”). The aspect of the collision accident differs depending on what kind of vehicle is included.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for executing notification according to the type of vehicle or the like.

In order to solve the above problems, a terminal device according to an aspect of the present invention is a terminal device that can be held by a vehicle or a pedestrian, and includes first vehicle type information related to the vehicle or pedestrian that holds the terminal device. For receiving the packet signal including the second vehicle type information related to the vehicle or the pedestrian that holds the other terminal device and that is a packet signal from the other terminal device. The processing specified according to the combination of the second vehicle type information included in the packet signal received by the communication unit and the first vehicle type information included in the packet signal to be transmitted from the communication unit. A control unit that executes the notification when the execution of the notification is determined.

It should be noted that an arbitrary combination of the above-described components and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

According to the present invention, notification according to the type of vehicle or the like can be executed.

It is a figure which shows the structure of the communication system which concerns on Example 1 of this invention. It is a figure which shows the structure of the base station apparatus of FIG. FIGS. 3A to 3D are diagrams showing frame formats defined in the communication system of FIG. It is a figure which shows the structure of the terminal device mounted in the vehicle of FIG. It is a figure which shows the data structure of the data stored in the packet signal used with the terminal device of FIG. It is a figure which shows the data structure of the vehicle classification information of FIG. It is a figure which shows the structure of the application execution part of FIG. It is a figure which shows the data structure of the table memorize | stored in the table memory | storage part of FIG. It is a flowchart which shows the notification procedure by the terminal device of FIG. It is a figure which shows the data structure of the table memorize | stored in the notification determination part which concerns on Example 2 of this invention.

Example 1
Prior to specific description of the first embodiment of the present invention, the basic knowledge will be described. Embodiment 1 of the present invention relates to a communication system that executes vehicle-to-vehicle communication between terminal devices mounted on a vehicle and also executes road-to-vehicle communication from a base station device installed at an intersection or the like to a terminal device. Such a communication system is also called ITS (Intelligent Transport Systems). ITS is stipulated in, for example, a standard for a 700 MHz band intelligent transportation system (Radio Industry Association). The communication system uses an access control function called CSMA / CA (Carrier Sense Multiple Access Collision Aviation), as well as a wireless LAN (Local Area Network) compliant with a standard such as IEEE 802.11. Therefore, the same radio channel is shared by a plurality of terminal devices. On the other hand, in ITS, it is necessary to transmit information to an unspecified number of terminal devices. In order to efficiently perform such transmission, the communication system broadcasts a packet signal.

That is, as a vehicle-to-vehicle communication, the terminal device broadcasts a packet signal that stores information such as the speed or position of the vehicle. In addition, the other terminal device receives the packet signal and recognizes the approach of the vehicle based on the above-described information. Here, in order to reduce interference between road-vehicle communication and vehicle-to-vehicle communication, the base station apparatus repeatedly defines a frame including a plurality of subframes. The base station apparatus selects any of a plurality of subframes for road-to-vehicle communication, and broadcasts a packet signal in which control information and the like are stored during the period of the head portion of the selected subframe.

The control information includes information related to a period during which the base station apparatus broadcasts a packet signal (hereinafter referred to as “road vehicle transmission period”). The terminal device specifies a road and vehicle transmission period based on the control information, and broadcasts a packet signal by the CSMA method in a period other than the road and vehicle transmission period (hereinafter referred to as “vehicle transmission period”). As a result, road-to-vehicle communication and vehicle-to-vehicle communication are time-division multiplexed. Note that a terminal device that cannot receive control information from the base station device, that is, a terminal device that exists outside the area formed by the base station device transmits a packet signal by the CSMA method regardless of the frame configuration.

Next, an outline of the present embodiment will be described. The terminal device notifies the driver of the approach of the vehicle, etc., but if the notification is made to all the vehicles, the number of notifications increases. If the number of notifications increases, the driver becomes a notification, so the alerting power by the notification is weakened. Therefore, it is desirable to notify only the approach of a vehicle with high risk. On the other hand, the terminal device is mounted on various types of vehicles, for example, large trucks, ordinary cars, and motorcycles. Furthermore, the terminal device is also carried by a pedestrian. In the following, a pedestrian may be included in the vehicle for the sake of clarity. When a vehicle collision accident occurs, the effect on the vehicle varies depending on the type of vehicle. Generally, as the size of a vehicle that has collided differs, the damage received by the smaller vehicle tends to increase. Therefore, it is desired to detect the approach of a highly dangerous vehicle based on different criteria depending on the type of vehicle on which the terminal device is mounted.

In order to cope with this, the packet signal broadcast from each terminal device includes information for identifying the type of the vehicle on which the terminal device is mounted (hereinafter referred to as “vehicle type information”). The terminal device uses a combination of its own vehicle type information (hereinafter referred to as “first vehicle type information”) and vehicle type information included in the received packet signal (hereinafter referred to as “second vehicle type information”). The execution of the notification of approach is determined by the process specified accordingly. That is, the process is changed depending on the combination.

FIG. 1 shows a configuration of a communication system 100 according to the first embodiment of the present invention. This corresponds to a case where one intersection is viewed from above. The communication system 100 includes a base station device 10, a first vehicle 12a, a second vehicle 12b, a third vehicle 12c, a fourth vehicle 12d, a fifth vehicle 12e, a sixth vehicle 12f, and a seventh vehicle 12g, collectively referred to as a vehicle 12. , The eighth vehicle 12h, and the network 202. Here, only the first vehicle 12 a is shown, but each vehicle 12 is equipped with a terminal device 14. An area 212 is formed around the base station apparatus 10, and an outside area 214 is formed outside the area 212.

As shown in the figure, the road that goes in the horizontal direction of the drawing, that is, the left and right direction, intersects the vertical direction of the drawing, that is, the road that goes in the up and down direction, at the central portion. Here, the upper side of the drawing corresponds to the direction “north”, the left side corresponds to the direction “west”, the lower side corresponds to the direction “south”, and the right side corresponds to the direction “east”. The intersection of the two roads is an “intersection”. The first vehicle 12a and the second vehicle 12b are traveling from left to right, and the third vehicle 12c and the fourth vehicle 12d are traveling from right to left. Further, the fifth vehicle 12e and the sixth vehicle 12f are traveling from the top to the bottom, and the seventh vehicle 12g and the eighth vehicle 12h are traveling from the bottom to the top.

In the communication system 100, the base station apparatus 10 is fixedly installed at an intersection. The base station device 10 controls communication between terminal devices. The base station device 10 receives a frame including a plurality of subframes based on a signal received from a GPS (Global Positioning System) satellite (not shown) or a frame formed by another base station device 10 (not shown). Generate repeatedly. Here, the road vehicle transmission period can be set at the head of each subframe.

The base station apparatus 10 selects a subframe in which the road and vehicle transmission period is not set by another base station apparatus 10 from among a plurality of subframes in the frame. The base station apparatus 10 sets a road and vehicle transmission period at the beginning of the selected subframe. The base station apparatus 10 notifies the packet signal in the set road and vehicle transmission period. In the road and vehicle transmission period, a plurality of packet signals may be notified. The packet signal includes, for example, accident information, traffic jam information, signal information, and the like. Note that the packet signal also includes information related to the timing when the road and vehicle transmission period is set and control information related to the frame.

The terminal device 14 is mounted on the vehicle 12 and movable as described above. Moreover, the terminal device 14 can be held by a pedestrian. When receiving the packet signal from the base station apparatus 10, the terminal apparatus 14 estimates that the terminal apparatus 14 exists in the area 212. When the terminal device 14 exists in the area 212, the terminal device 14 generates a frame based on the control information included in the packet signal, in particular, the information on the timing when the road and vehicle transmission period is set and the information on the frame. As a result, the frame generated in each of the plurality of terminal devices 14 is synchronized with the frame generated in the base station device 10. The terminal device 14 notifies the packet signal in the vehicle transmission period that is a period different from the road and vehicle transmission period. Here, CSMA / CA is executed in the vehicle transmission period. On the other hand, when it is estimated that the terminal apparatus 14 exists outside the area 214, the terminal apparatus 14 notifies the packet signal by executing CSMA / CA regardless of the frame configuration.

FIG. 2 shows the configuration of the base station apparatus 10. The base station apparatus 10 includes an antenna 20, an RF unit 22, a modem unit 24, a processing unit 26, a control unit 28, and a network communication unit 30. Further, the processing unit 26 includes a frame defining unit 32, a selecting unit 34, and a generating unit 36.

The RF unit 22 receives a packet signal from the terminal device 14 (not shown) or another base station device 10 by the antenna 20 as a reception process. The RF unit 22 performs frequency conversion on the received radio frequency packet signal to generate a baseband packet signal. Further, the RF unit 22 outputs a baseband packet signal to the modem unit 24. In general, baseband packet signals are formed by in-phase and quadrature components, so two signal lines should be shown, but here only one signal line is shown for clarity. Shall be shown. The RF unit 22 also includes an LNA (Low Noise Amplifier), a mixer, an AGC, and an A / D conversion unit.

The RF unit 22 performs frequency conversion on the baseband packet signal input from the modem unit 24 as a transmission process, and generates a radio frequency packet signal. Further, the RF unit 22 transmits a radio frequency packet signal from the antenna 20 during the road-vehicle transmission period. The RF unit 22 also includes a PA (Power Amplifier), a mixer, and a D / A conversion unit. For example, the 700 MHz band is used as the radio frequency.

The modem unit 24 demodulates the baseband packet signal from the RF unit 22 as a reception process. Further, the modem unit 24 outputs the demodulated result to the processing unit 26. The modem unit 24 also modulates the data from the processing unit 26 as a transmission process. Further, the modem unit 24 outputs the modulated result to the RF unit 22 as a baseband packet signal. Here, since the communication system 100 corresponds to the OFDM (Orthogonal Frequency Division Multiplexing) modulation method, the modem unit 24 also executes FFT (Fast Fourier Transform) as reception processing and IFFT (Inverse TransFastFast) as transmission processing. Also execute.

The frame defining unit 32 receives a signal from a GPS satellite (not shown), and acquires time information based on the received signal. In addition, since a well-known technique should just be used for acquisition of the information of time, description is abbreviate | omitted here. The frame defining unit 32 generates a plurality of frames based on the time information. For example, the frame defining unit 32 generates ten “100 msec” frames by dividing the “1 sec” period into ten on the basis of the timing indicated by the time information. By repeating such processing, the frame is defined to be repeated. The frame defining unit 32 may detect control information from the demodulation result and generate a frame based on the detected control information. Such processing corresponds to generating a frame synchronized with the timing of the frame formed by another base station apparatus 10.

FIGS. 3A to 3D show frame formats defined in the communication system 100. FIG. FIG. 3A shows the structure of the frame. The frame is formed of N subframes indicated as the first subframe to the Nth subframe. This can be said that the terminal device 14 forms a frame by multiplexing a plurality of subframes that can be used for notification for a plurality of hours. For example, when the frame length is 100 msec and N is 8, a subframe having a length of 12.5 msec is defined. N may be other than 8. The description of FIGS. 3B to 3D will be described later, and returns to FIG.

The selection unit 34 selects a subframe in which a road and vehicle transmission period is to be set from among a plurality of subframes included in the frame. More specifically, the selection unit 34 receives a frame defined by the frame defining unit 32. The selection unit 34 receives an instruction regarding the selected subframe via an interface (not shown). The selection unit 34 selects a subframe corresponding to the instruction. Apart from this, the selection unit 34 may automatically select a subframe. At this time, the selection unit 34 inputs a demodulation result from another base station device 10 or the terminal device 14 (not shown) via the RF unit 22 and the modem unit 24. The selection part 34 extracts the demodulation result from the other base station apparatus 10 among the input demodulation results. The selection unit 34 specifies the subframe that has not received the demodulation result by specifying the subframe that has received the demodulation result.

This corresponds to specifying a subframe in which the road and vehicle transmission period is not set by another base station apparatus 10, that is, an unused subframe. When there are a plurality of unused subframes, the selection unit 34 selects one subframe at random. When there are no unused subframes, that is, when each of a plurality of subframes is used, the selection unit 34 acquires reception power corresponding to the demodulation result, and gives priority to subframes with low reception power. Select

FIG. 3B shows a configuration of a frame generated by the first base station apparatus 10a. The first base station apparatus 10a sets a road and vehicle transmission period at the beginning of the first subframe. Moreover, the 1st base station apparatus 10a sets a vehicle transmission period following the road and vehicle transmission period in a 1st sub-frame. The vehicle transmission period is a period during which the terminal device 14 can notify the packet signal. That is, the first base station apparatus 10a can notify the packet signal in the road and vehicle transmission period which is the first period of the first subframe, and the terminal apparatus in the vehicle and vehicle transmission period other than the road and vehicle transmission period in the frame. It is specified that 14 can broadcast the packet signal. Furthermore, the first base station apparatus 10a sets only the vehicle transmission period from the second subframe to the Nth subframe.

FIG. 3C shows a configuration of a frame generated by the second base station apparatus 10b. The second base station apparatus 10b sets a road and vehicle transmission period at the beginning of the second subframe. Also, the second base station apparatus 10b sets the vehicle transmission period from the first stage of the road and vehicle transmission period in the second subframe, from the first subframe and the third subframe to the Nth subframe. FIG. 3D shows a configuration of a frame generated by the third base station apparatus 10c. The third base station apparatus 10c sets a road and vehicle transmission period at the beginning of the third subframe. In addition, the third base station apparatus 10c sets the vehicle transmission period from the first stage of the road and vehicle transmission period in the third subframe, the first subframe, the second subframe, and the fourth subframe to the Nth subframe. As described above, the plurality of base station apparatuses 10 select different subframes, and set the road and vehicle transmission period at the head portion of the selected subframe. Returning to FIG. The selection unit 34 outputs the selected subframe number to the generation unit 36.

The generation unit 36 receives a subframe number from the selection unit 34. The generation unit 36 sets a road and vehicle transmission period in the subframe of the received subframe number, and generates a packet signal to be notified during the road and vehicle transmission period. When a plurality of packet signals are transmitted in one road and vehicle transmission period, the generation unit 36 generates them. The packet signal is composed of control information and a payload. The control information includes a subframe number in which a road and vehicle transmission period is set. The payload includes, for example, accident information, traffic jam information, signal information, and the like. These data are acquired from the network 202 (not shown) by the network communication unit 30. The processing unit 26 broadcasts the packet signal to the modem unit 24 and the RF unit 22 during the road and vehicle transmission period. The control unit 28 controls processing of the entire base station device 10.

This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program loaded in the memory, but here it is realized by their cooperation. Draw functional blocks. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms only by hardware, or by a combination of hardware and software.

FIG. 4 shows the configuration of the terminal device 14 mounted on the vehicle 12. As described above, the vehicle 12 may include a pedestrian. The terminal device 14 includes an antenna 50, an RF unit 52, a modem unit 54, a processing unit 56, and a control unit 58. The processing unit 56 includes a timing specifying unit 60, a transfer determination unit 62, an acquisition unit 64, a generation unit 66, a notification unit 70, and an application execution unit 76. The timing specifying unit 60 includes an extraction unit 72 and a carrier sense unit 74. The antenna 50, the RF unit 52, and the modem unit 54 execute the same processing as the antenna 20, the RF unit 22, and the modem unit 24 in FIG. Here, the difference will be mainly described.

The modem unit 54 and the processing unit 56 receive a packet signal from another terminal device 14 or the base station device 10 (not shown) in the reception process. As described above, the modem unit 54 and the processing unit 56 receive a packet signal from the base station apparatus 10 during the road-to-vehicle transmission period, and receive packet signals from other terminal apparatuses 14 during the vehicle-to-vehicle transmission period. To do.

The extraction unit 72 specifies the timing of the subframe in which the road and vehicle transmission period is arranged when the demodulation result from the modem unit 54 is a packet signal from the base station device 10 (not shown). In that case, the extraction part 72 estimates that it exists in the area 212 of FIG. The extraction unit 72 generates a frame based on the subframe timing and the content of the message header of the packet signal. As a result, the extraction unit 72 generates a frame synchronized with the frame formed in the base station device 10. When the notification source of the packet signal is another terminal device 14, the extraction unit 72 omits the synchronized frame generation process. If the extraction unit 72 exists in the area 212, the extraction unit 72 specifies the remaining vehicle transmission period after specifying the road and vehicle transmission period in use. The extraction unit 72 outputs information on frame and subframe timing and vehicle transmission period to the carrier sense unit 74.

On the other hand, when the extraction unit 72 has not received a packet signal from the base station apparatus 10, that is, when a frame synchronized with the base station apparatus 10 has not been generated, the extraction unit 72 estimates that it is outside the area 214 in FIG. When the extraction unit 72 exists outside the area 214, the extraction unit 72 selects a timing unrelated to the frame configuration, and instructs the carrier sense unit 74 to execute carrier sense unrelated to the frame configuration.

The carrier sense unit 74 receives information on frame and subframe timing and vehicle transmission period from the extraction unit 72. The carrier sense unit 74 determines the transmission timing by starting CSMA / CA within the vehicle transmission period. This is equivalent to setting NAV (Network Allocation Vector) for the road and vehicle transmission period and performing carrier sense outside the period in which NAV is set. On the other hand, when the carrier sense unit 74 is instructed by the extraction unit 72 to execute carrier sense not related to the frame configuration, the carrier sense unit 74 performs transmission timing by executing CSMA / CA without considering the frame configuration. To decide. The carrier sense unit 74 notifies the modem unit 54 and the RF unit 52 of the determined transmission timing, and broadcasts the packet signal.

The transfer determination unit 62 controls transfer of control information. The transfer determination unit 62 extracts information to be transferred from the control information. The transfer determination unit 62 generates information to be transferred based on the extracted information. Here, the description of this process is omitted. The transfer determination unit 62 outputs information to be transferred, that is, a part of the control information, to the generation unit 66. The generation unit 66 receives data from the application execution unit 76 and receives part of the control information from the transfer determination unit 62. Data received from the application execution unit 76 will be described later. The generating unit 66 generates a packet signal by storing a part of the received control information in the control information and storing data in the payload. The processing unit 56, the modem unit 54, and the RF unit 52 sequentially notify the plurality of packet signals generated by the generating unit 66. The control unit 58 controls the operation of the terminal device 14.

The acquisition unit 64 includes a GPS receiver (not shown), a gyroscope, a vehicle speed sensor, and the like. Based on data supplied from these, the location of the vehicle 12 (not shown), that is, the position of the vehicle 12 on which the terminal device 14 is mounted, the progress Direction, moving speed, etc. (hereinafter collectively referred to as “position information”) are acquired. The existence position is indicated by latitude and longitude. Since a known technique may be used for these acquisitions, description thereof is omitted here. The GPS receiver, gyroscope, vehicle speed sensor, and the like may be outside the terminal device 14. The acquisition unit 64 outputs the position information to the application execution unit 76.

The application execution unit 76 can execute a plurality of types of applications. Each application is executed between the plurality of terminal devices 14. That is, the transmission-side terminal device 14 generates data and broadcasts the packet signal in which the data is stored, and the reception-side terminal device 14 receives the packet signal and stores the data included in the packet signal. And a predetermined process is executed. Therefore, one application is divided into processing on the transmission side (hereinafter referred to as “transmission-side application”) and processing on the reception side (hereinafter referred to as “reception-side application”). Here, the transmission-side application and the reception-side application that are executed in one terminal device 14 need not match. Hereinafter, the transmission side application and the reception side application may be collectively referred to as an application.

∙ Multiple types of applications are classified as follows. The first is a common application. The common application is an application for warning the driver of the approach of another vehicle 12 and is executed in all the terminal devices 14. The application execution unit 76 inputs position information from the acquisition unit 64 when executing the transmission side application in the common application. In addition, the application execution unit 76 periodically outputs position information to the generation unit 66.

On the other hand, the application execution unit 76 acquires the position information included in the packet signal from the other terminal device 14 from the extraction unit 72 as a reception-side application in the common application. The application execution unit 76 detects the approach of the other vehicle 12 based on the position information of the other terminal device 14 acquired from the extraction unit 72 and the position information input from the acquisition unit 64. Details of the process for detecting the approach will be described later. The application execution unit 76 causes the notification unit 70 to notify the approach of another vehicle 12. The notification unit 70 performs notification to the driver via a monitor or a speaker. The second is a free application. The free application is executed only on an arbitrary terminal device 14 instead of all terminal devices 14. Multiple free applications may be executed simultaneously.

Here, among a plurality of types of applications, a common application is the target of explanation, and this may be simply called an application. On the other hand, the description of the free application is omitted. The format of data output from the application execution unit 76 to the generation unit 66 and the format of data input from the extraction unit 72 to the application execution unit 76 will be described. This can be said to be a data structure in the packet signal used in the terminal device 14.

FIG. 5 shows a data structure of data stored in the packet signal used in the terminal device 14. Data to be exchanged is shown as a functional unit. An example of the data element is shown after the description of the functional unit. Note that these functional units may not be included in one packet signal, but may be divided into a plurality of packet signals and stored. The data control / management information unit is a section that describes management information (between vehicles and roads), data version, and continuity of data. An example of the data element included in this is a vehicle ID and a vehicle type. The vehicle ID is information that is temporarily set for each vehicle. The vehicle type (vehicle classification) sets the type of the own vehicle. FIG. 6 shows the data structure of the vehicle type information. The vehicle type is identified by 4 bits. For example, “large passenger cars and medium-sized passenger cars (vehicles with a structure on which people are exclusively placed)” are indicated by a value of “0000”. Returning to FIG.

The location information unit is a section that describes location information and location information delay information. This includes the position information acquired by the acquisition unit 64. The vehicle state information unit is a term that describes dynamic (time-varying) vehicle information. The speed (speed) sets the speed of the host vehicle. For example, it is shown every 1 km / h between 0 and 255 km / h. The azimuth (direction) is set to a value of up to 359 degrees clockwise with north as 0 degrees as the traveling direction of the host vehicle. The turn signal SW state (winker) sets the turn signal SW state of the vehicle. For example, “Undefined” is indicated as “000”, “Winker OFF” is indicated as “100”, “Right ON” is indicated as “101”, “Left ON” is indicated as “110”, “ “No turn signal equipment (eg pedestrian)” is indicated as “111”.

Other vehicle information unit is a section that describes other vehicle information. For example, the handle amount is included. The time information unit is a term that describes time information such as GPS. The intersection information unit is a term that describes information on nearby intersections. The road segment information unit is a term that describes segment information of a road that is running. The specific vehicle information unit is a section that describes information such as an emergency car. The specific vehicle operation information is set when the specific vehicle is in operation. For example, “normal state” is indicated as “0”, and “operating state” is indicated as “1”. The reserved area unit is a section that describes information for function expansion. The free area (Independent Domain) is an area that can be used outside the common application.

In summary, in the communication system 100, both the base station apparatus 10 and the terminal apparatus 14 perform communication at a cycle of about 100 ms. Further, in order to reduce interference between road-to-vehicle communication and vehicle-to-vehicle communication, road-to-vehicle communication and vehicle-to-vehicle communication are time-division multiplexed. In order to secure the road-to-vehicle transmission period, the base station apparatus 10 includes the transmission time and road-to-vehicle communication period information in the packet signal and notifies the surrounding terminal devices. The terminal device 14 in the area 212 synchronizes time based on the transmission time received from the base station device 10 and stops transmission based on road-to-vehicle communication period information, thereby timing CSMA / CA at a timing other than the road-vehicle transmission period. The packet signal is transmitted at. The inter-vehicle communication payload is composed of common application data and free application data.

FIG. 7 shows the configuration of the application execution unit 76. The application execution unit 76 includes a vehicle type information storage unit 80, a table storage unit 82, a processing reference determination unit 84, and a notification determination unit 86. Here, the configuration related to the reception processing in the application execution unit 76 is shown, and the configuration related to the transmission processing is omitted. Position information and the like from the acquisition unit 64 are input to the notification determination unit 86. Data from other terminal devices 14 is input to the processing standard determination unit 84 and the notification determination unit 86. The data from the other terminal device 14 includes second vehicle type information related to the vehicle or pedestrian holding the other terminal device 14.

The vehicle type information storage unit 80 stores first vehicle type information. The first vehicle type information is registered in the vehicle type information storage unit 80 in advance before the terminal device 14 is used. The first vehicle type information is stored in a packet signal notified from the terminal device 14. This corresponds to the vehicle type information in FIG. The process reference determination unit 84 acquires the second vehicle type information included in the data from the other terminal devices 14 and also acquires the first vehicle type information stored in the vehicle type information storage unit 80. The process reference determination unit 84 selects a process for determining a notification by referring to the table stored in the table storage unit 82 based on the combination of the first vehicle type information and the second vehicle type information. To do.

FIG. 8 shows the data structure of the table stored in the table storage unit 82. The leftmost column of the table shows the type of the own vehicle, and the top row of the table shows the type of the other vehicle. The former corresponds to the first vehicle type information, and the latter corresponds to the second vehicle type information. The process reference determination unit 84 specifies a row corresponding to the first vehicle type information and specifies a column corresponding to the second vehicle type information. Further, the processing criterion determination unit 84 selects the number indicated at the position where the identified row and column intersect. As illustrated, the number corresponds to any one of “1” to “10”. The numbers indicated by “1” to “10” correspond to the process for determining the notification. Details of the processes indicated by the numbers “1” to “10” will be described later. Returning to FIG.

The process reference determination unit 84 outputs the selected process number to the notification determination unit 86. The notification determination unit 86 inputs the position information and the like from the acquisition unit 64 and also inputs data from other terminal devices 14. Further, the notification determination unit 86 inputs the number from the processing standard determination unit 84. The notification determination unit 86 executes processing corresponding to the number. In the process, position information and data are used. Below, the process corresponding to a number is demonstrated in order.

(1) Number 1
Number 1 is used for rear-end collision / collision prevention. The notification determining unit 86, [[distance calculated from the position information of both the host vehicle and other vehicles] <["relative speed information calculated from both the host vehicle and other vehicles" × a (constant)], Check if the traveling direction information of the other vehicle is suitable for your vehicle. When this condition is satisfied, the notification determination unit 86 determines execution of notification. In addition, the data from the acquisition part 64 is used as information regarding the own vehicle, and the data from the other terminal device 14 is used as information regarding the other vehicle. Further, the speed of the host vehicle is calculated from a vehicle speed pulse, an acceleration sensor, or the like.

(2) Number 2
No. 2 is used for preventing right / left turn in addition to preventing collision and collision. The notification determination unit 86 checks the following conditions in addition to the condition of number 1. The notification determining unit 86 is [distance calculated from “position information of both own vehicle and other vehicle”] <b (constant)], and the relative direction and the direction of the blinker SW are −c degrees to + c degrees. It is confirmed whether it is within the range or the direction of the handle amount is directed to the left or right (turns more than d degrees). When these conditions are satisfied, the notification determination unit 86 determines the execution of notification.

(3) Number 3
The notification determination part 86 confirms that an emergency vehicle passes based on specific vehicle operation information. The notification determination unit 86 determines the execution of notification. Note that the notification determination unit 86 may predict a road through which an emergency vehicle passes from the position information, speed information, and traveling direction information of another vehicle, and may determine the execution of the notification when overlapping with the traveling direction of the host vehicle. .

(4) Number 4
The notification determination unit 86 confirms that the road work vehicle exists based on the vehicle type information, and confirms that the other vehicle is in front from the position information of the other vehicle and the traveling direction information of the own vehicle. . When these conditions are satisfied, the notification determination unit 86 determines the execution of notification.
(5) Number 5
The notification determination unit 86 performs the same process as the process of number 2.
(6) Number 6
The notification determination unit 86 executes the same process as the process of number 1.

(7) Number 7
In addition to the process of No. 2, the notification determination unit 86 identifies the person other than the pedestrian if the speed information of the other vehicle is equal to or greater than g [km / h]. If it is a pedestrian, the notification determination part 86 will determine execution of notification.
(8) Number 8
The notification determination unit 86 executes the process of number 2 and prompts manual input of vehicle type information.

(9) Number 9
The notification determination unit 86 sets the distance calculated from the “position information of both the own vehicle and the other vehicle” <[“both the own vehicle and the other vehicle” under the condition that the speed information of the other vehicle is e [km / h] or more. In the case of “relative speed information calculated from“ × a (constant) ”, it is confirmed whether the traveling direction information of the other vehicle is suitable for the own vehicle. When these conditions are satisfied, the notification determination unit 86 determines the execution of notification.
(10) Number 10
The notification determination unit 86 confirms whether there is position information of the other vehicle ahead (on the track) in the traveling direction of the own vehicle and whether the speed of the other vehicle is fkm / h or less. When these conditions are satisfied, the notification determination unit 86 determines the execution of notification.
(11) ×
The notification determination unit 86 does not execute processing.

As a result of the processing as described above, in the table of FIG. 8, when the first vehicle type information is a four-wheel vehicle such as a to e, the notification determination unit 86 sets the second vehicle type information to 4 as a to e. If it is a wheeled vehicle, a process for predicting the occurrence of a collision is executed. On the other hand, if the first vehicle type information is a four-wheel vehicle such as a to e and the second vehicle type information is a two-wheel vehicle such as f to i, the notification determination unit 86 is involved in addition to the collision. A process for predicting the occurrence of occurrence is executed. In addition, the notification determination unit 86 is involved in addition to the collision when the second vehicle type information is a four-wheel vehicle such as a to e and the first vehicle type information is a two-wheel vehicle such as f to i. A process for predicting the occurrence of occurrence is executed.

In addition, the notification determination unit 86 is involved in addition to the collision when the second vehicle type information is a two-wheeled vehicle such as f to i, and the first vehicle type information is a two-wheeled vehicle such as f to i. A process for predicting the occurrence of occurrence is executed. That is, the notification determination part 86 performs the process prescribed | regulated according to the combination of 2nd vehicle type information and 1st vehicle type information. When the notification determination unit 86 determines to execute the notification, the notification determination unit 86 causes the notification unit 70 to execute the notification. At this time, the notification determination unit 86 may output data from another terminal device 14 such as position information from the acquisition unit 64 to the notification unit 70.

The operation of the communication system 100 configured as above will be described. FIG. 9 is a flowchart illustrating a notification procedure performed by the terminal device 14. The processing reference determination unit 84 acquires the first vehicle type information (S10) and acquires the second vehicle type information (S12), and determines the processing content by referring to the table of the table storage unit 82. (S14). If the notification determination unit 86 determines that notification is necessary (Y in S16), the notification unit 70 executes notification (S18). If the notification determining unit 86 does not determine that notification is necessary (N in S16), the process is terminated.

According to the embodiment of the present invention, since the process defined according to the combination of the second vehicle type information and the first vehicle type information is executed, the process according to the type of the vehicle or the like can be executed. By such processing, notification according to the type of vehicle or the like can be executed. In addition, the amount of processing can be optimized by such processing. Since notification according to the type of the vehicle or the like is made, unnecessary notification is suppressed, and a reduction in the alerting power to the driver can be suppressed. Since the occurrence of entrainment is estimated in the case of a two-wheel vehicle and a four-wheel vehicle as compared with the case of four-wheel vehicles, the risk of the two-wheel vehicle being involved can be reduced. Further, since the occurrence of entrainment is not estimated in the case of four-wheeled vehicles, an increase in the processing amount can be suppressed.

(Example 2)
As in the first embodiment, the second embodiment relates to a communication system in which vehicle-to-vehicle communication is performed and road-to-vehicle communication is also performed. As in the first embodiment, the terminal device according to the second embodiment determines whether to perform notification by processing according to the first vehicle type information and the second vehicle type information. Here, it is assumed that the terminal device 14 is a packet signal to be processed and the amount of packet signals from other terminal devices is larger than the processing capability of the terminal device 14. If it is determined whether notification is to be executed for all packet signals, the processing delay increases. Therefore, the terminal device preferentially processes packet signals from other terminal devices mounted on other vehicles that have a large influence when a vehicle on which the terminal device is mounted collides. The communication system 100, the base station device 10, the terminal device 14, and the application execution unit 76 according to the second embodiment are the same types as those in FIGS. 1, 2, 4, and 7, and here, differences will be mainly described. .

7 receives the position information from the acquisition unit 64, the data from the other terminal device 14, and the number from the processing reference determination unit 84. Further, the notification determination unit 86 also inputs the first vehicle type information from the vehicle type information storage unit 80. FIG. 10 shows a data structure of a table stored in the notification determination unit 86 according to the second embodiment of the present invention. The left column shows the type of the vehicle. This is the same as FIG. The notification determination unit 86 selects a row corresponding to the specified type of the own vehicle by specifying the type of the own vehicle based on the input first vehicle type information. In the selected row, the order of processing numbers to be processed with priority is shown.

The notification determination unit 86 accumulates a plurality of input data and processes them in the order shown in FIG. If new data is input when the processing has progressed to the middle order, the processing of the numbers indicated thereafter may be omitted. That is, the notification determination part 86 processes each data according to the order of the process with respect to 2nd vehicle classification information, when several data are input. Further, the order of processing is defined so as to differ depending on the first vehicle type information.

According to the embodiment of the present invention, processing is executed in order, so that important data can be processed preferentially. By preferentially processing important data, even when the amount of data to be processed is large, it is possible to notify the danger of an accident having a large impact. In addition, since the order is defined for each type of vehicle or the like, the processing can be executed in an order suitable for the type of vehicle or the like.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each of those constituent elements or combinations of processing processes, and such modifications are also within the scope of the present invention. .

In the embodiment of the present invention, the processing standard determination unit 84 selects the process for determining the notification based on the second vehicle type information included in the data from the other terminal devices 14. However, the present invention is not limited to this. For example, the process reference determination unit 84 may change the second vehicle type information and select a process. More specifically, even if the second vehicle type information indicates a pedestrian, if the moving speed of the pedestrian carrying the other terminal device 14 is higher than the threshold value, the processing standard determination unit 84 The person may be changed to “n. Pedestrian determined as other than pedestrian, other vehicle type unknown” in FIG. That is, even if the second vehicle type information is a pedestrian, the processing reference determination unit 84 determines the processing as a type other than the pedestrian if the movement speed of the pedestrian is higher than the threshold value. . The threshold value is set to “10 km / h”, for example. This corresponds to a case where a pedestrian carrying another terminal device 14 gets on a normal car or the like. Note that the processing standard determination unit 84 may change to “f. Motorcycle” instead of “n. Pedestrian determined as other than pedestrian, other vehicle type unknown”. According to this modification, it is possible to cope with a pedestrian riding in a predetermined vehicle.

The above processing may be similarly applied even if the second vehicle type information is not a pedestrian but a bicycle. For example, even if the second vehicle type information indicates a bicycle, if the moving speed of the bicycle on which the other terminal device 14 is mounted is higher than a threshold value, the processing criterion determination unit 84 designates the pedestrian as “ n. "Pedestrian determined as other than pedestrian, other vehicle type unknown" may be changed to select the process. The threshold value is set to “40 km / h”, for example. This corresponds to a case where a bicycle equipped with another terminal device 14 is loaded on an ordinary car or the like. According to this modification, it is possible to cope with a bicycle mounted on a predetermined vehicle.

The outline of one embodiment of the present invention is as follows. A terminal device according to an aspect of the present invention is a terminal device that can be held by a vehicle or a pedestrian, and notifies a packet signal that includes first vehicle type information related to the vehicle or pedestrian that holds the terminal device. A communication unit that receives a packet signal that is a packet signal from another terminal device and includes second vehicle type information related to a vehicle or a pedestrian that holds the other terminal device, and the communication unit receives the packet signal. The notification is executed by executing a process defined according to the combination of the second vehicle type information included in the packet signal and the first vehicle type information included in the packet signal to be transmitted from the communication unit. A control unit that executes notification when it is determined.

According to this aspect, since the process defined according to the combination of the second vehicle type information and the first vehicle type information is executed, notification according to the type of the vehicle or the like can be executed.

When the first vehicle type information is a four-wheel vehicle and the second vehicle type information is a four-wheel vehicle, the control unit executes a process for predicting the occurrence of a collision, and the second vehicle type information is 2 In the case of a wheeled vehicle, a process for predicting the occurrence of entrainment in addition to the collision may be executed. In this case, since the occurrence of entrainment is predicted in the case of a two-wheel vehicle and a four-wheel vehicle compared to the case of four-wheel vehicles, the occurrence of a collision can be suppressed.

When the second vehicle type information is a four-wheel vehicle and the first vehicle type information is a four-wheel vehicle, the control unit executes a process for predicting the occurrence of a collision, and the first vehicle type information is 2 In the case of a wheeled vehicle, a process for predicting the occurrence of entrainment in addition to the collision may be executed. In this case, since the occurrence of entrainment is predicted in the case of a two-wheel vehicle and a four-wheel vehicle compared to the case of four-wheel vehicles, the occurrence of a collision can be suppressed.

When the control unit receives a plurality of packet signals, the control unit may process each packet signal according to the order of processing for the second vehicle type information. In this case, since the processing is executed in the order, important packet signals can be preferentially processed. The packet signal may conform to the 700 MHz band intelligent transportation system standard.

The order of processing used by the control unit may be defined according to the first vehicle type information. In this case, the order of processing suitable for the type of vehicle or the like can be defined.

The control unit may execute the process even if the second vehicle type information is a pedestrian, assuming that it is a type other than a pedestrian if the moving speed of the pedestrian is higher than a threshold value. In this case, even if a pedestrian is riding in a predetermined vehicle, it can be handled.

10 base station devices, 12 vehicles, 14 terminal devices, 20 antennas, 22 RF units, 24 modulation / demodulation units, 26 processing units, 28 control units, 30 network communication units, 32 frame definition units, 34 selection units, 36 generation units, 50 Antenna, 52 RF section, 54 modulation / demodulation section, 56 processing section, 58 control section, 60 timing identification section, 62 transfer determination section, 64 acquisition section, 66 generation section, 70 notification section, 72 extraction section, 74 carrier sense section, 76 Application execution unit, 80 vehicle type information storage unit, 82 table storage unit, 84 processing standard determination unit, 86 notification determination unit, 100 communication system, 202 network, 212 area, outside 214 area.

Claims

A terminal device that can be held by a vehicle or a pedestrian,
A packet signal including the first vehicle type information related to the vehicle or pedestrian holding the terminal device and the packet signal from the other terminal device and holding the other terminal device or A communication unit that receives a packet signal including second vehicle type information related to a pedestrian;
A process defined according to a combination of the second vehicle type information included in the packet signal received by the communication unit and the first vehicle type information included in the packet signal to be transmitted from the communication unit is executed. Thus, when it is determined to execute the notification, a control unit that executes the notification;
A terminal device comprising:
When the first vehicle type information is a four-wheel vehicle and the second vehicle type information is a four-wheel vehicle, the control unit executes a process for predicting the occurrence of a collision, and the second vehicle type information is If it is a two-wheeled vehicle, the terminal device of Claim 1 which performs the process for predicting generation | occurrence | production of an entrainment in addition to a collision.
When the second vehicle type information is a four-wheel vehicle and the first vehicle type information is a four-wheel vehicle, the control unit executes a process for predicting the occurrence of a collision, and the first vehicle type information If it is a two-wheeled vehicle, the terminal device of Claim 1 which performs the process for predicting generation | occurrence | production of an entrainment in addition to a collision.
4. The terminal device according to claim 1, wherein, when a plurality of packet signals are received, the control unit processes each packet signal according to a processing order for the second vehicle type information. 5. .
The terminal device according to claim 4, wherein the processing order used by the control unit is defined according to the first vehicle type information.
Even if the second vehicle type information is a pedestrian, the control unit executes the process as a type other than a pedestrian if the moving speed of the pedestrian is higher than a threshold value. The terminal device according to claim 1.