JPWO2014002485A1 - Wireless device - Google Patents

Abstract

When receiving a packet signal from another wireless device, the filtering unit 68 selects a packet signal to be processed from the received packet signals. The position information extraction unit 82 extracts position information included in the packet signal from the received packet signal. The input unit 80 acquires the position information that has been measured. The selection unit 84 selects a packet signal based on the acquired position information and the extracted position information.

Description

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

  In the Intelligent Transport System (ITS), the vehicle-mounted device may reach an intersection and acquire information from both a roadside device that provides information on the direction of travel and a roadside device that provides information on the direction of travel. . At that time, in order to provide only necessary information to the user, the azimuth information is used to determine whether the information can be output (for example, see Patent Document 1).

JP 2009-151715 A JP 2009-151714 A

  When the signal source is only a fixed roadside machine, information on the roadside machine on the same side as the traveling direction of the intersection may be useful, and only that information may be displayed. However, when a vehicle-mounted device or the like is included in the signal transmission source, a signal selection criterion suitable for that is required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for selecting a desired packet signal even when packet signals from various wireless devices can be received. .

  In order to solve the above-described problem, a wireless device according to an aspect of the present invention is a wireless device, and includes: a receiving unit that receives a packet signal from another wireless device; and a processing among packet signals received by the receiving unit A filtering unit that selects packet signals to be processed. The filtering unit is an extraction unit that extracts position information included in the packet signal received from the reception unit, an acquisition unit that acquires measured position information, and position information acquired by the acquisition unit, A selection unit that selects a packet signal based on the position information extracted by the extraction unit.

  It should be noted that any combination of the above-described constituent elements 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, a desired packet signal can be selected even when packet signals from various wireless devices can be received.

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 of FIG. It is a figure which shows the data contained in the packet signal transmitted from the terminal device of FIG. It is a figure which shows the structure of the filtering part of FIG. It is a flowchart which shows the procedure of the filtering process by the filtering part of FIG. It is a flowchart which shows the procedure of another filtering process by the filtering part of FIG. It is a figure which shows the structure of the filtering part which concerns on Example 2 of this invention. It is a flowchart which shows the procedure of the filtering process by the filtering part of FIG. It is a figure which shows the structure of the filtering part which concerns on Example 3 of this invention. It is a flowchart which shows the procedure of the filtering process by the filtering part of FIG. It is a figure which shows the structure of the filtering part which concerns on Example 4 of this invention. It is a flowchart which shows the procedure of the filtering process by the filtering part of FIG. It is a figure which shows the structure of the filtering part which concerns on Example 5 of this invention. It is a flowchart which shows the procedure of the filtering process by the filtering part of FIG. It is a figure which shows the structure of the terminal device which concerns on Example 6 of this invention. It is a figure which shows the structure of the application processing apparatus which concerns on Example 6 of this invention. It is a sequence diagram which shows the procedure of the reception process which concerns on Example 6 of this invention. It is a figure which shows the format of the sub-frame which concerns on Example 7 of this invention. It is a figure which shows the structure of the communication system which concerns on Example 8 of this invention. It is a figure which shows another structure of the communication system which concerns on Example 8 of this invention. It is a figure which shows another structure of the communication system which concerns on Example 8 of this invention. It is a figure which shows the outline | summary of the process in the selection part which concerns on Example 8 of this invention. It is a flowchart which shows the procedure of the filtering process by the filtering part which concerns on Example 8 of this invention.

  Prior to specific description of the embodiments of the present invention, the underlying knowledge will be described. Embodiments of the present invention relate to a communication system that performs 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). 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 inter-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 for the base station apparatus to broadcast the 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. Some terminal devices are mounted on a vehicle (hereinafter referred to as “vehicle terminal device”), while others are carried by pedestrians (hereinafter referred to as “portable terminal device”). Hereinafter, the in-vehicle terminal device and the portable terminal device may be collectively referred to as a terminal device, or the in-vehicle terminal device and the portable terminal device may be referred to as a terminal device without being distinguished from each other.

  In this way, the terminal device receives packet signals from various wireless devices such as a base station device, an in-vehicle terminal device, and a portable terminal device. In consideration of the processing amount and processing delay in the terminal device, it is desired to select a packet signal necessary for processing from the received packet signals. On the other hand, for the purpose of accident prevention, information on vehicles and pedestrians around the vehicle is important. When electric field strength is used to select a packet signal necessary for processing, selection by electric field strength is not sufficient for accident prevention because the electric field strength and distance do not always match. In addition, when using azimuth information for selection, since the risk is low if the distance is long even if there is a azimuth, the selection based on the azimuth information cannot be applied to accident prevention. Therefore, it is desirable to filter packet signals that are useful for application programs in an environment where packet signals are received from various wireless devices.

Example 1
Next, an outline of the present embodiment will be described. In order to cope with the above situation, the terminal device extracts position information from the received packet signal. Further, the terminal device acquires position information by positioning or the like. The latter position information corresponds to, for example, position information of a vehicle on which the terminal device is mounted. The terminal device calculates the distance from both pieces of position information. When the distance is shorter than the threshold value, the terminal device selects the packet signal.

  FIG. 1 shows a configuration of a communication system 100 according to Embodiment 1 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. The terminal device 14 may be carried by a pedestrian (not shown). 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 drawing, 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 apparatus 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 apparatus 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.

  As described above, the terminal device 14 is mounted on the vehicle 12 and is movable. 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 a 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 includes an LNA (Low Noise Amplifier), a mixer, an AGC, and an A / D conversion unit.

  As a transmission process, the RF unit 22 performs frequency conversion on the baseband packet signal input from the modem unit 24 to generate 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.

  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 an OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme, the modem unit 24 also performs FFT (Fast Fourier Transform) as reception processing and IFFT (Inverse Fast Trans) 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.

  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 part 34 selects the sub-frame which should set a road and vehicle transmission period among several sub-frames contained in the flame | 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 is no unused subframe, 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. 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 determining unit 62, a position information acquiring unit 64, a generating unit 66, a filtering unit 68, and a notification unit 70. The timing specifying unit 60 includes an extracting unit 72 and a carrier sensing unit 74. Including. As described above, the terminal device 14 may be mounted on the vehicle 12 or carried by a pedestrian. In either case, the same operation may be performed, so the former case will be described here. 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 other terminal device 14 may be the terminal device 14 mounted on the vehicle 12 or the terminal device 14 carried by a pedestrian.

  When the demodulation result from the modem unit 54 is a packet signal from the base station apparatus 10 (not shown), the extraction unit 72 specifies the timing of the subframe in which the road and vehicle transmission period is arranged. 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 timing of the subframe and the content of the message header of the packet signal, specifically, the content of the road and vehicle transmission period length. Note that the generation of the frame only needs to be performed in the same manner as the frame defining unit 32 described above, and thus the description thereof is omitted here. 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.

  On the other hand, when the extraction unit 72 has not received a packet signal from the base station apparatus 10, the extraction unit 72 estimates that the extraction unit 72 exists outside the area 214 in FIG. When it is estimated that the extraction unit 72 exists in the area 212, the extraction unit 72 selects the vehicle transmission period. When it is estimated that the extraction unit 72 exists outside the area 214, the extraction unit 72 selects a timing unrelated to the frame configuration. When the vehicle transmission period is selected, the extraction unit 72 outputs information on the frame and subframe timing and the vehicle transmission period to the carrier sense unit 74. When selecting the timing unrelated to the frame configuration, the extraction unit 72 instructs the carrier sense unit 74 to execute carrier sense.

  The carrier sense unit 74 receives information about the timing of the frames and subframes and the 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. 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 position information acquisition unit 64 includes a GPS receiver, a gyroscope, a vehicle speed sensor, and the like (not shown), and the presence position of the vehicle 12 (not shown), that is, the vehicle 12 on which the terminal device 14 is mounted, by data supplied from them. The traveling direction, the 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 position information acquisition unit 64 outputs the position information to the generation unit 66.

  The generation unit 66 receives position information from the position information acquisition unit 64 and receives part of the control information from the transfer determination unit 62. The generation unit 66 generates the included packet signal and broadcasts the generated packet signal via the modem unit 54, the RF unit 52, and the antenna 50 at the transmission timing determined by the carrier sense unit 74. This corresponds to inter-vehicle communication.

  The filtering unit 68 selects a packet signal to be processed by the notification unit 70 from among the packet signals received by the extraction unit 72, that is, packet signals from the base station device 10 and other terminal devices 14. Here, the filtering condition of the user is input to the filtering unit 68 via an input button or a remote controller (not shown). Although details of the filtering condition will be described later, it can be said that the filtering condition is a selection criterion for a packet signal to be output to the notification unit 70 among packet signals received by the terminal device 14. When the filtering unit 68 receives the received packet signal, the filtering unit 68 determines whether the filtering condition is set in advance, and outputs the matched packet signal to the notification unit 70.

  The notification unit 70 displays the contents of the received packet signal on a display (not shown) or the like. The notification unit 70 detects the approach of the other vehicle 12 based on the position information of the other terminal device 14 acquired from the filtering unit 68 and the position information input from the position information acquisition unit 64. The notification unit 70 notifies the driver of the approach of another vehicle 12 via a monitor or a speaker. Furthermore, the notification unit 70 notifies the driver of obstacle detection information, traffic jam information, lamp color information, and the like via a monitor or a speaker. Note that the notification unit 70 may execute another application program.

  FIG. 5 shows data included in the packet signal transmitted from the terminal device 14. Note that FIG. 5 is an example of data, and other data may be included in the packet signal. Types of information include identifiers, vehicle types, position information, vehicle information, time information, and others. First, the field name of the identifier is a vehicle ID and is a unique value when the vehicle is transmitted. By tracking this ID, the movement of the vehicle can be understood. Next is the vehicle type. In contrast, emergency vehicles (operational state), emergency vehicles (normal state), heavy trucks, large buses, medium trucks, medium buses, ordinary cars (including small trucks and small buses), motorcycles, motorbikes, One is selected from bicycles, light vehicles other than bicycles, pedestrians, trams, and others. It identifies the state when only emergency vehicles such as ambulances and fire engines are operating and when they are not. By selecting a pedestrian, it can also be used as a packet for inter-walk communication.

  The position information includes latitude, longitude, and altitude as field names and includes information individually. Such information may be acquired from GPS. The vehicle information includes speed, traveling direction, acceleration, brake, turn signal, and hazard as field names. Values are recorded for speed and acceleration. For the traveling method, for example, the clockwise angle when north is 0 degree is recorded. The brake is selected from ON, OFF, and indefinite. For the winker, it is selected from right, left, OFF, and indefinite. The hazard is selected from ON and OFF. Time information is expressed in hours, minutes, and seconds in universal time. This information may be acquired from GPS. Others include free areas that can be used only by specific applications.

  FIG. 6 shows the configuration of the filtering unit 68. The filtering unit 68 includes an input unit 80, a position information extraction unit 82, a selection unit 84, and a storage unit 98. The position information extraction unit 82 extracts position information included in the packet signal from the packet signal received by the extraction unit 72. This can be said to be position information for another terminal device 14 that is a transmission source of the packet signal. The input unit 80 acquires the position information measured by the position information acquisition unit 64.

  The selection unit 84 selects a packet signal according to the filtering condition based on the position information acquired by the position information acquisition unit 64 and the position information extracted by the position information extraction unit 82. More specifically, the selection unit 84 derives a distance between the position information acquired by the position information acquisition unit 64 and the position information extracted by the position information extraction unit 82. For the derivation of the distance, for example, a vector operation is executed. However, the present invention is not limited to this, and a known technique may be used. When the distance is shorter than the threshold value as the filtering condition, the selection unit 84 selects a packet signal including the position information extracted by the position information extraction unit 82. If the filtering condition is not satisfied, the packet signal is discarded. The storage unit 98 stores a threshold value for the distance and holds a packet signal.

  The operation of the communication system 100 configured as above will be described. FIG. 7 is a flowchart showing the procedure of the filtering process by the filtering unit 68. Here, it is assumed that the user inputs the threshold value T in advance and the threshold value T is held in the filtering unit 68. This T indicates a distance, which means that only a packet signal whose distance between vehicles is shorter than the threshold value T is subjected to reception processing. When the packet signal is received (S100), the received packet signal is sent to the filtering unit 68 via the antenna 50, the RF unit 52, and the modem unit 54. At the same time, the position information of the host vehicle acquired by the position information acquisition unit 64 is also sent to the filtering unit 68. The position information extraction unit 82 extracts position information from the packet signal, and the selection unit 84 calculates the inter-vehicle distance between the host vehicle and the other vehicle. If the inter-vehicle distance is smaller than the threshold value T (Y in S102), the selection unit 84 executes the packet reception process (S106), so the packet signal is transferred to the notification unit 70. On the other hand, if the inter-vehicle distance is not smaller than the threshold value T (N in S102), a packet signal discarding process (S104) is executed.

  FIG. 8 is a flowchart showing another filtering procedure performed by the filtering unit 68. In FIG. 7, the filtering process is performed for each received packet, whereas in FIG. 8, the filtering process is performed at regular intervals. As an example, it is assumed that the certain period is a frame period of 100 ms. Here, it is assumed that the user inputs the maximum number of packet signals after filtering in advance, and this is held in the filtering unit 68.

  Processing starts at the beginning of the frame. When the packet signal is received (S200), the position information acquisition unit 64 extracts the vehicle ID and the position information, the selection unit 84 calculates the inter-vehicle distance, and the packet signal information is paired with the vehicle ID and the inter-vehicle distance. And hold it together (S202). At that time, sorting is performed in ascending order of the inter-vehicle distance (S204). This process is executed for each packet signal received up to the beginning of the next frame (N in S206). When the head of the next frame is reached (Y in S206), the selection unit 84 sends packet signals for the maximum number of packet signals to the notification unit 70 in the order of the shortest distance between vehicles (S208). However, if a packet with the same vehicle ID is received during a cycle that is a unit of processing, the held packet is overwritten with the latest received packet.

  According to the embodiments of the present invention, a packet signal useful for an application can be selected even in an environment where various types of packet signals are received. In addition, since the packet signal filtering process can be performed, the display screen can be easily understood. Moreover, the amount of information processing can be suppressed. Since a packet signal transmitted from another wireless device having a short distance is selected, it is possible to select information to be focused on in order to avoid an accident. Since processing is performed in units of a certain period, the amount of packet signals after filtering can be suppressed to a certain amount or less while filtering important packet signals.

(Example 2)
Next, a second embodiment of the present invention will be described. As in the first embodiment, the second embodiment also relates to a terminal device that performs a filtering process on a received packet signal. However, the filtering condition in the second embodiment is different from the filtering condition in the first embodiment. The terminal device according to the second embodiment determines the type of the received packet signal. The terminal device selects the packet signal when the type is a predetermined type. The communication system 100 according to the second embodiment is the same type as that in FIG. 1, the base station apparatus 10 according to the second embodiment is the same type as that in FIG. 2, and the terminal apparatus 14 according to the second embodiment is This is the same type as 4, and here, the difference will be mainly described.

  FIG. 9 shows a configuration of the filtering unit 68 according to the second embodiment of the present invention. The filtering unit 68 includes a determination unit 86, a selection unit 88, and a storage unit 90. The determination unit 86 determines the type of packet signal received by the extraction unit 72. Here, the type of the packet signal is any one of a packet signal transmitted from the base station device 10, a packet signal transmitted from the in-vehicle terminal device, and a packet signal transmitted from the portable terminal device. When the packet signal is received in the road and vehicle transmission period, the determination unit 86 determines that the packet signal is a packet signal transmitted from the base station device 10. On the other hand, when the packet signal is received during the vehicle transmission period, the packet signal is transmitted from the in-vehicle terminal device or transmitted from the portable terminal device based on the vehicle type in the packet signal. Determine if it is a packet signal. The determination unit 86 outputs the determination result to the selection unit 88.

  The storage unit 90 stores filtering conditions for packet signal types in advance. Here, for example, selection of a packet signal transmitted from an in-vehicle terminal device is stored as the filtering condition. A plurality of types may be stored as filtering conditions. The selection unit 88 selects a packet signal according to the filtering condition stored in the storage unit 90 based on the type determined by the determination unit 86. Packet signals that do not meet the filtering conditions are discarded.

  FIG. 10 is a flowchart showing the procedure of the filtering process by the filtering unit 68. Here, the packet signal to be identified includes a packet signal transmitted from the base station device 10 (hereinafter also referred to as “roadside device packet”), a packet signal transmitted from the vehicle terminal device (hereinafter referred to as “vehicle equipment packet”). ”), And three types of packet signals (hereinafter also referred to as“ pedestrian terminal packets ”) transmitted from the portable terminal device. Moreover, the vehicle-mounted device packet and the pedestrian terminal packet have a common format. When the packet signal is received (S300), the determination unit 86 determines whether the packet signal is received within the road-vehicle transmission period. If the packet signal is received within the road-vehicle transmission period (Y in S302), It is determined as a roadside device packet (S304).

  If it is not received within the road and vehicle transmission period (N in S302), the determination unit 86 confirms the vehicle type of the received packet signal, and if it is a pedestrian (Y in S306), determines that it is a pedestrian terminal packet. (S308). On the other hand, if it is not a pedestrian (N of S306), the determination part 86 will determine with an onboard equipment packet (S310). The storage unit 90 stores in advance the types of packet signals to be selected from the roadside device packet, the vehicle-mounted device packet, and the pedestrian terminal packet. At that time, a plurality of types of packet signals may be selected. The selection unit 88 determines whether or not the packet type stored in the storage unit 90 matches the type of the packet signal determined by the determination unit 86. If they match, packet reception processing is performed, and if they do not match, packet discard processing is performed.

  According to the embodiment of the present invention, since the packet signal is selected based on the type of the packet signal, the packet signal transmitted from the desired wireless device can be selected. Since a predetermined type of packet signal is selected, necessary information can be acquired.

(Example 3)
Next, a third embodiment of the present invention will be described. The third embodiment also relates to a terminal device that executes a filtering process on a received packet signal, as before. However, the filtering conditions in the third embodiment are different from the conventional filtering conditions. The terminal device according to the third embodiment determines the type of vehicle on which another terminal device that is a transmission source of the received packet signal is mounted. The terminal device selects the packet signal when the type is a predetermined type. The communication system 100 according to the third embodiment is the same type as that shown in FIG. 1, the base station device 10 according to the third embodiment is the same type as that shown in FIG. 2, and the terminal device 14 according to the third embodiment is shown in FIG. This is the same type as 4, and here, the difference will be mainly described.

  FIG. 11 shows the configuration of the filtering unit 68 according to the third embodiment of the present invention. The filtering unit 68 includes a type information extraction unit 92, a selection unit 94, and a storage unit 96. The type information extraction unit 92 extracts the vehicle type included in the packet signal from the packet signal received by the extraction unit 72. The vehicle type is information relating to an item to be transported by another terminal device 14 that is a transmission source of the packet signal. The object to be transported may be a person. As described above, an emergency vehicle (operating state) or the like is identified by the vehicle type. The type information extraction unit 92 outputs the extracted vehicle type to the selection unit 94.

  The storage unit 96 stores filtering conditions for vehicle types in advance. Here, as filtering conditions, for example, an emergency vehicle (operation state), an emergency vehicle (normal state), a large truck, a large bus, a medium truck, a medium bus, a normal car (including a small truck and a small bus), a motorcycle, The selection of a packet signal transmitted from another terminal device 14 mounted on the motorbike is stored. In addition, as filtering conditions, selecting other packet conditions, for example, the packet signal transmitted from the other terminal device 14 carried by the pedestrian may be memorize | stored. The selection unit 94 selects a packet signal according to the filtering condition stored in the storage unit 96 based on the type information extracted by the type information extraction unit 92. Packet signals that do not meet the filtering conditions are discarded.

  FIG. 12 is a flowchart showing the procedure of the filtering process by the filtering unit 68. Here, it is assumed that the vehicle type to be selected is stored in the storage unit 96. When the packet is received (S400), the received packet is sent to the filtering unit 68. The type information extraction unit 92 sends the acquired vehicle type to be selected to the filtering unit 68. The type information extracting unit 92 extracts vehicle type information from the received packet signal, and the selection unit 94 is a packet reception process (S406) if the extracted vehicle type information is a vehicle type for which filtering is set (Y in S402). ) Is made. On the other hand, if the extracted vehicle type information is not the vehicle type for which filtering is set (N in S402), the selection unit 94 performs a packet discarding process (S404).

  According to the embodiment of the present invention, since the packet signal is selected based on the vehicle type information, it is possible to select the packet signal transmitted from the terminal device mounted on the desired vehicle. Since a packet signal from a terminal device mounted on a predetermined type of vehicle is selected, it is possible to acquire necessary information.

Example 4
Next, a fourth embodiment of the present invention will be described. The fourth embodiment also relates to a terminal device that executes a filtering process on a received packet signal, as before. Until now, one filtering condition has been set. On the other hand, the terminal device according to the fourth embodiment sets a plurality of filtering conditions, and selects a packet signal that satisfies all the conditions. The communication system 100 according to the fourth embodiment is the same type as that shown in FIG. 1, the base station device 10 according to the fourth embodiment is the same type as that shown in FIG. 4, and the terminal device 14 according to the fourth embodiment is shown in FIG. This is the same type as 4, and here, the difference will be mainly described.

  FIG. 13 shows a configuration of the filtering unit 68 according to the fourth embodiment of the present invention. The filtering unit 68 includes a first filtering unit 68a, a second filtering unit 68b, an Mth filtering unit 68m, and an output unit 110.

  The first filtering unit 68a, the second filtering unit 68b, and the Mth filtering unit 68m set different filtering conditions. For example, the first filtering unit 68a executes the selection process according to the filtering condition shown in the first embodiment, and the second filtering unit 68b executes the selection process according to the filtering condition shown in the second embodiment. Then, the Mth filtering unit 68m executes the selection process according to the filtering condition shown in the third embodiment. The filtering unit 68 also includes a third filtering unit 68c (not shown), which executes a selection process according to filtering conditions different from those in the first to third embodiments.

  The output unit 110 receives the result of the Mth filtering unit 68m from the first filtering unit 68a, and finally selects the packet signal when all of the first filtering unit 68a to the Mth filtering unit 68m are selected. To do. That is, the filtering unit 68 also executes a packet signal selection process based on a selection criterion different from the selection criterion shown in any of the first to third embodiments. Further, when the packet signal selected in any one of the first to third embodiments is also selected according to other selection criteria, the filtering unit 68 finally selects the packet signal.

  FIG. 14 is a flowchart showing the procedure of the filtering process by the filtering unit 68. This is, for example, a method of filtering a vehicle type of bicycle and a distance between vehicles of 50 m or less. That is, this is an example in which there are filtering conditions from 1 to m, and these process packets that satisfy the conditions simultaneously. When the packet is received (S500), the received packet is sent to the filtering unit 68. The filtering unit 68 performs the packet reception process (S506) if all of the plurality of filtering conditions 1 to m match (Y in S502). On the other hand, if at least one of the plurality of filtering conditions 1 to m does not match (N in S502), the filtering unit 68 performs a packet discarding process (S504).

  According to the embodiment of the present invention, the packet signal is selected when all of the plurality of filtering conditions are satisfied, so that the amount of the packet signal to be processed can be reduced. Since the amount of packet signals is reduced, the amount of processing can be reduced. Only necessary information can be displayed.

(Example 5)
Next, a fifth embodiment of the present invention will be described. As in the fourth embodiment, the fifth embodiment also relates to a terminal device that performs a filtering process on a received packet signal, and particularly relates to a terminal device in which a plurality of filtering conditions are set. The terminal device according to the fourth embodiment selects a packet signal that satisfies all of the plurality of filtering conditions. The terminal device according to the fifth embodiment sets priorities for each of a plurality of filtering conditions. The terminal device executes a selection process based on a filtering condition having a high priority. If the number of selected packet signals is less than a predetermined number of packet signals (hereinafter referred to as “number of set packets”), the terminal device ends the selection process. On the other hand, if the number of selected packet signals is not smaller than the number of set packets, the terminal device performs a selection process based on another filtering condition having a low priority on the already selected packet signal. The purpose of this processing is to keep the amount of packet signals below a certain amount. The communication system 100 according to the fifth embodiment is the same type as that in FIG. 1, the base station apparatus 10 according to the fifth embodiment is the same type as that in FIG. 4, and the terminal apparatus 14 according to the fifth embodiment is This is the same type as 4, and here, the difference will be mainly described.

  FIG. 15 shows the configuration of the filtering unit 68 according to the fifth embodiment of the present invention. The filtering unit 68 includes a first filtering unit 68a, a second filtering unit 68b, an Mth filtering unit 68m, an output unit 112, and a memory 114. The first filtering unit 68a, the second filtering unit 68b, and the Mth filtering unit 68m are the same as those in FIG. Different priorities are set for each of the first filtering unit 68a, the second filtering unit 68b, and the M-th filtering unit 68m. Here, as an example, the first filtering unit 68a has the highest priority, the second filtering unit 68b has the next highest priority, and the Mth filtering unit 68m has the lowest priority.

  The output unit 112 controls operations of the first filtering unit 68a, the second filtering unit 68b, and the Mth filtering unit 68m. The output unit 112 causes the first filtering unit 68a to execute processing according to priority in order. The memory 114 stores the number of set packets. By performing filtering by the first filtering unit 68a, the output unit 112 compares the number of packet signals selected in a predetermined period (hereinafter referred to as “unit period”) with the number of set packets. If the number of selected packet signals is less than or equal to the set number of packets, the output unit 112 outputs the selected packet signal.

  On the other hand, when the number of selected packet signals is larger than the set number of packets, the selected packet signals are temporarily stored in the memory 114. The second filtering unit 68b performs a filtering process on the packet signal stored in the memory 114. The output unit 112 compares the number of packet signals selected by the filtering by the second filtering unit 68b with the number of set packets. Further, when the number of selected packet signals is larger than the number of set packets, low priority filtering processes are sequentially executed until the number of selected packet signals reaches the set number of packets. That is, packet signal selection processing based on other selection criteria is sequentially executed. Even after the filtering process with the lowest priority, that is, the filtering process by the Mth filtering unit 68m, if the number of selected packet signals is larger than the set number of packets, the selected packet signal is output. That's fine. Alternatively, in this case, the selected packet signal may be discarded.

  FIG. 16 is a flowchart showing the procedure of the filtering process by the filtering unit 68. Here, it is assumed that the filtering condition 1 has the highest priority and the filtering process m has the lowest priority. The set packet number T is stored in the memory 114 in advance. Here, a processing period is a frame period of 100 ms. First, processing is started at the beginning of the frame. The counter value of the number of packet signals is initialized to 0 (S600). When a packet signal is received (Y in S604) until the head of the next frame comes (N in S602), it is confirmed whether or not the filtering condition 1 is satisfied (S606). If satisfied (Y in S606), the packet is held in the memory 114 (S608), and the number of packet signals is counted (S610). If not satisfied (N in S606), the packet is discarded and the reception of the next packet signal is awaited (N in S604). Next, when the head of the frame is reached (Y in S602), the parameter value of the filtering condition is set to 1 (S612).

  When the number of packet signals satisfying the filtering condition is smaller than the set packet number T (N in S614), the contents of the memory 114 are output to the notification unit 70 (S628). When the number is larger than the set packet number T (Y in S614), the number of packets is initialized, and the filtering condition is advanced to the next one (S616). If there is a stored packet signal in the memory 114 (N in S618), the packet signal held in the memory 114 is read (S620), and if the filtering condition N is met (Y in S622), the packet The signal is stored again in the memory 114 (S624), and the number of packets is incremented (S626). When the filtering condition N is not met (N in S622), the packet signal is discarded. If there is no packet signal stored in the memory 114 (Y in S618), it is re-determined whether the number of re-saved packet signals is greater than the set packet number T (S614). If the number is larger than the set packet number T, the following filtering condition is applied (Y in S614), and if it is smaller, the stored packet signal is output (S628).

  According to the embodiment of the present invention, when filtering is performed according to a filtering condition with high priority, if the number of set packets is reduced, the filtering process is terminated, so that an increase in the processing amount can be suppressed. When the selection is made according to the filtering condition having a high priority, if the number of set packets is not reduced, the filtering is executed based on the filtering condition having a low priority, so that the number of packet signals can be reduced.

(Example 6)
Next, a sixth embodiment of the present invention will be described. The sixth embodiment also relates to a terminal device that executes a filtering process on a received packet signal as before. In the sixth embodiment, the terminal device is wirelessly connected to the application processing device. The application processing device corresponds to, for example, a mobile phone terminal device such as a smartphone. The terminal device transmits the packet signal selected by the filtering process to the application processing device. Based on the selected packet signal, the application processing apparatus notifies the driver of the approach of another vehicle 12, obstacle detection information, traffic jam information, light color information, and the like via a monitor and a speaker. That is, the terminal device does not operate alone but operates in pairs with the application processing device. The communication system 100 according to the sixth embodiment is the same type as that shown in FIG. 1, and the base station apparatus 10 according to the sixth embodiment is the same type as that shown in FIG. 4.

  FIG. 17 shows the configuration of the terminal device 14 according to the sixth embodiment of the present invention. The terminal device 14 includes an antenna 50, an RF unit 52, a modem unit 54, a processing unit 56, a control unit 58, a communication unit 120, and an antenna 122. The processing unit 56 includes a timing specifying unit 60, a transfer determining unit 62, a position information acquiring unit 64, a generating unit 66, and a filtering unit 68. The timing specifying unit 60 includes an extracting unit 72 and a carrier sense unit 74. The communication unit 120 performs communication with an application processing apparatus (not shown) via the antenna 122. Here, for example, wireless LAN or short-range wireless communication may be used for communication. The communication unit 120 receives a signal from the application processing apparatus. The signal includes information such as filtering conditions and the number of set packets. Based on these pieces of information, the filtering unit 68 is set. The filtering unit 68 selects a packet signal as before, and the selected packet signal is transmitted to the application processing apparatus via the communication unit 120 and the antenna 122.

  FIG. 18 shows a configuration of an application processing apparatus 130 according to the sixth embodiment of the present invention. The application processing apparatus 130 includes a first antenna 132, a position information acquisition unit 134, a second antenna 136, a communication unit 138, an application program processing unit 140, a notification unit 142, and an operation unit 144. The position information acquisition unit 134 receives a signal from a GPS satellite (not shown) via the first antenna 132. The position information acquisition unit 134 acquires position information of the application processing apparatus 130. The communication unit 138 communicates with the terminal device 14 via the second antenna 136. For the communication, for example, a short-range wireless communication system is used. As a result, the communication unit 138 acquires a packet signal for road-to-vehicle communication and a packet signal for vehicle-to-vehicle communication from the terminal device 14.

  The application program processing unit 140 receives information from the terminal device 14 and also receives position information from the position information acquisition unit 134. The application program processing unit 140 executes the application program based on these pieces of information. Any application program may be used. For example, a danger prediction application program related to the driving of the vehicle 12 can be considered. The operation unit 144 is a part such as a touch panel where a user can input information, and the notification unit 142 is a display part such as a liquid crystal. Here, the communication between the terminal device 14 and the application processing apparatus 130 is wireless, but may be wired.

  FIG. 19 is a sequence diagram illustrating a procedure of reception processing according to the sixth embodiment of the present invention. The application processing apparatus 130 starts an application program (S700). The user sets filtering conditions via the operation unit 144 (S702). The application processing device 130 transmits the filtering condition to the terminal device 14 (S704). The filtering unit 68 of the terminal device 14 performs filtering according to the filtering condition (S706). The communication unit 120 transfers the packet signal selected by filtering to the application processing apparatus 130 (S708). The application program processing unit 140 of the application processing apparatus 130 processes the transferred packet signal (S710) and causes the notification unit 142 to display the content of the received packet signal.

  According to the embodiment of the present invention, since the packet signal to be transferred is selected based on the filtering condition received from the application processing apparatus, information necessary for the application processing apparatus can be transferred. Further, since the packet signal to be transferred is selected based on the filtering condition received from the application processing apparatus, an increase in the traffic volume for transfer can be suppressed. In addition, since unnecessary packet signals are not transferred, the amount of packet signals to be processed by the application processing apparatus can be suppressed. Moreover, since the amount of packet signals to be processed by the application processing device is suppressed, the processing amount of the application processing device can be suppressed. Further, since the filtering condition is set according to the application program, information suitable for the application program being executed by the application processing apparatus can be transferred. By suppressing the traffic of communication between the application processing device and the terminal device to a certain amount or less, real-time transfer processing and real-time processing of the application program are guaranteed.

(Example 7)
Next, a seventh embodiment of the present invention will be described. The seventh embodiment particularly relates to a portable terminal device carried by a pedestrian. Until now, the in-vehicle terminal device and the portable terminal device notify the packet signal during the vehicle transmission period. On the other hand, in Example 7, the frame is composed of a road and vehicle transmission period, a pedestrian transmission period, and a vehicle and vehicle transmission period. The in-vehicle terminal device notifies the packet signal in the vehicle transmission period, while the portable terminal device notifies the packet signal in the walking vehicle transmission period. That is, the period in which the in-vehicle terminal device can report the packet signal and the period in which the portable terminal device can report the packet signal are time-division multiplexed. The communication system 100 according to the seventh embodiment is the same type as in FIG. 1, the base station apparatus 10 according to the seventh embodiment is the same type as in FIG. 4, and the terminal apparatus 14 according to the seventh embodiment is the same as FIG. This is the same type as 4, and here, the difference will be mainly described. A combination of FIG. 17 and FIG. 18 may be used.

  FIG. 20 illustrates a subframe format according to the seventh embodiment of the present invention. As illustrated, the subframe is composed of a road and vehicle transmission period, a pedestrian transmission period, and a vehicle and vehicle transmission period. Information regarding the configuration of such a subframe is stored in a packet signal from the base station apparatus 10. The extraction part 72 of FIG. 4 specifies a vehicle transmission period or a pedestrian transmission period.

  According to the embodiment of the present invention, since the vehicle transmission period and the road and vehicle transmission period are separated, the packet signal from the in-vehicle terminal device and the packet signal from the portable terminal device can be easily identified. Since the packet signal can be easily identified, the processing can be simplified.

(Example 8)
Next, an eighth embodiment of the present invention will be described. The eighth embodiment also relates to a terminal device that executes a filtering process on a received packet signal, as before. However, the filtering conditions in the eighth embodiment are different from the conventional filtering conditions. The terminal device according to the eighth embodiment derives a relative positional relationship with another terminal device that is a transmission source of the received packet signal, and a predetermined range based on the relative positional relationship. The packet signal is selected. The communication system 100 according to the eighth embodiment is the same type as in FIG. 1, the base station apparatus 10 according to the eighth embodiment is the same type as in FIG. 2, and the terminal apparatus 14 according to the eighth embodiment is 4 and the filtering unit 68 according to the eighth embodiment is the same type as in FIG. Here, the difference will be mainly described.

  FIG. 21 shows a configuration of a communication system 100 according to the eighth embodiment of the present invention. In FIG. 21, the second vehicle 12b and the third vehicle 12c are included in the first group 16a, the fourth vehicle 12d is included in the second group 16b, and the fifth vehicle 12e is included in the third group 16c. Various applications that use vehicle-to-vehicle communication of the communication system 100 and are intended for driving safety and security are assumed. First, the applications assumed mainly on expressways include Forward Collation Warning (Forward Collision Prevention), Electronic Emergency Break Light (Electronic Emergency Brake Light), Blind Spot Warning and Lane Change (Lane Change and Dead Angle Warning 3) The type is specified.

  Among these, the first two are vehicles 12 running in front of the same lane. In frontal collision prevention, the vehicle 12 immediately before the same lane as the subject vehicle is targeted, whereas the electronic emergency brake light targets vehicles 12 up to several vehicles in the same lane. When the host vehicle is the first vehicle 12a, the third vehicle 12c is a target for preventing a forward collision, and the second vehicle 12b is a target for an electronic emergency brake light. In both applications, since the traveling direction of the subject vehicle with respect to the subject vehicle is the same, the relative angle is substantially 0, and the vehicle 12 is ahead of the subject vehicle in the traveling direction and is within a predetermined distance. The vehicle 12 is a target.

  In the case of the lane change and blind spot warning application, the vehicle 12 in the adjacent lane and next to or behind the host vehicle is targeted. When the host vehicle is the first vehicle 12a, the fourth vehicle 12d and the fifth vehicle 12e are targeted. Since the traveling direction of the host vehicle and the target vehicle 12 is the same, the relative angle is almost 0, and the vehicle 12 that is located at the rear of the right lick from the right side to the traveling direction and that is smaller than a certain threshold is on the right side. This is the target vehicle 12 when changing the lane. Further, since the traveling direction of the host vehicle and the target vehicle 12 is the same, the relative angle is substantially 0, and the vehicle 12 is located at a position behind the left lick from the left side to the traveling direction, and the distance is smaller than a certain threshold value. This is the target vehicle 12 when the lane is changed to the left side.

  FIG. 22 shows another configuration of the communication system 100 according to the eighth embodiment of the present invention. This is left turn support, which is one of the applications assumed at intersections. In the case of left turn support, the target vehicle is a rear vehicle with a vehicle type of two-wheeled vehicle. When the host vehicle is the first vehicle 12a, the motorcycle 18 included in the first group 16a is targeted.

  FIG. 23 shows still another configuration of the communication system 100 according to the eighth embodiment of the present invention. This is right turn support, which is one of the applications assumed at intersections. In the case of right turn support, a vehicle that is ahead of the right lick toward the traveling direction and that has a distance smaller than a threshold value is the target vehicle. When the host vehicle is the first vehicle 12a, the vehicles 12 included in the first group 16a, that is, the second vehicle 12b, the third vehicle 12c, the fourth vehicle 12d, and the fifth vehicle 12e are targeted.

  Next, the configuration of the terminal device 14 mounted on the vehicle 12 that is the host vehicle will be described. The selection unit 84 in FIG. 6 selects a packet signal according to filtering conditions based on the position information acquired by the position information acquisition unit 64 and the position information extracted by the position information extraction unit 82. Specifically, the selection unit 84 derives the distance between the position information acquired by the position information acquisition unit 64 and the position information extracted by the position information extraction unit 82 and the relative position between the vehicles. The relative position between the vehicles is a relative direction from the position information acquired by the position information acquisition unit 64 to the position information extracted by the position information extraction unit 82. For the derivation of the distance and the relative position, for example, a vector operation is executed. However, the present invention is not limited to this, and a known technique may be used. The selection unit 84 selects a packet signal including the position information extracted by the position information extraction unit 82 when the distance is shorter than the threshold value and the relative positional relationship is within a range as a filtering condition. To do. Thus, distance and relative direction are used for selecting the packet signal. If the filtering condition is not satisfied, the packet signal is discarded. The storage unit 98 stores a threshold value for the distance and a threshold value for the relative positional relationship, and holds a packet signal.

  FIG. 24 shows an outline of processing in the selection unit 84 according to the eighth embodiment of the present invention. Here, the vehicle 12 corresponding to the transmission side of the packet signal, that is, the second vehicle 12b to the fifth vehicle 12e in FIG. 21, the two-wheeled vehicle 18 in FIG. 22, and the second vehicle 12b to the fifth vehicle 12e in FIG. It is called a vehicle. Further, the vehicle 12 corresponding to the packet signal receiving side, that is, the first vehicle 12a in FIGS. 21 to 23 is referred to as “own vehicle”. FIG. 24 shows a method for detecting the positional relationship between the host vehicle and the transmission source vehicle. The position information (GPS information) of the host vehicle is acquired from the position information acquired by the position information acquisition unit 64, and the position information (GPS information) of the transmission source vehicle is extracted by the received packet signal (position information extraction unit 82). (Location information). Based on this information, the position of the transmission source vehicle when the own vehicle is arranged at the origin is plotted. In the example of FIG. 24, the transmission source vehicle is plotted at a position separated by a distance K in the northeast direction. Next, the traveling direction of the host vehicle is acquired using a gyro sensor or the like. In the case of the example in FIG. 24, the host vehicle is moving in the northwest direction. As a result, the transmission source vehicle is on the right side of 90 degrees, that is, directly beside when the traveling direction of the host vehicle is considered as a reference.

  FIG. 25 is a flowchart illustrating the procedure of the filtering process performed by the filtering unit 68 according to the eighth embodiment of the present invention. Here, it is assumed that threshold values T1, A1, and A2 corresponding to the application are held in the filtering unit 68. T1 indicates a distance, and A1 and A2 indicate angles. This means that only the packet signal whose distance between the vehicles is shorter than the threshold value T1 and whose relative position between the vehicles is between the threshold values A1 and A2 is subjected to reception processing. When the packet signal is received (S800), the received packet signal is sent to the filtering unit 68 via the antenna 50, the RF unit 52, and the modem unit 54. At the same time, the position information of the host vehicle acquired by the position information acquisition unit 64 is also sent to the filtering unit 68. The position information extraction unit 82 extracts position information from the packet signal, and the selection unit 84 calculates the inter-vehicle distance between the host vehicle and the other vehicle. If the distance between the vehicles is smaller than the threshold value T1 and the relative position between the vehicles is between the threshold values A1 and A2 (Y in S802), the selection unit 84 executes the packet reception process (S806). Therefore, the packet signal is transferred to the notification unit 70. On the other hand, if the inter-vehicle distance is not smaller than the threshold value T (N in S802), a packet signal discarding process (S804) is executed.

  According to the embodiment of the present invention, since a packet signal from a radio signal existing at a specific position is selected, information suitable for application execution can be selected. Moreover, since the vehicle immediately before the same lane as the subject vehicle is targeted, a forward collision prevention application can be executed. In addition, because it targets vehicles up to several vehicles on the same lane, an electronic emergency brake light application can be executed. Further, since the vehicle 12 in the adjacent lane and beside or behind the subject vehicle is targeted, the application of lane change and blind spot warning can be executed. In addition, since the vehicle type is a rear vehicle and the vehicle type is a two-wheeled vehicle, an application for left turn support can be executed. In addition, since the vehicle is a vehicle in front of the right lick toward the traveling direction and the distance is smaller than a certain threshold value, the right turn support can be executed.

  In the above, this invention was demonstrated based on the Example. 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 Embodiments 1 to 7 of the present invention, the terminal device 14 executes a filtering process. However, the present invention is not limited to this. For example, the base station device 10 may execute the filtering process. According to this modification, the base station apparatus 10 can also select a desired packet signal.

  In the first embodiment of the present invention, the selection unit 84 derives the distance between the position information acquired by the position information extraction unit 82 and the position information extracted by the position information extraction unit 82. However, the present invention is not limited thereto. For example, the selection unit 84 may derive the sum of the absolute value of the difference in latitude and the absolute value of the difference in longitude for the two pieces of position information. Furthermore, when the sum is shorter than the threshold value, the selection unit 84 selects a packet signal including the position information extracted by the position information extraction unit 82. According to this modification, the processing amount can be reduced.

  In the first embodiment of the present invention, the filtering condition is set with the short distance between the vehicles as important. However, the present invention is not limited to this, and for example, the filtering condition may be set with importance being close to the specified distance, and the filtering condition may be set with importance being far from the specified distance. According to this modification, the degree of freedom in designing the filtering condition regarding the distance can be expanded.

  The distance between vehicles is used as the filtering condition in the first embodiment of the present invention, the packet type is used as the filtering condition in the second embodiment of the present invention, and the vehicle type is used as the filtering condition in the third embodiment of the present invention. . However, not limited to this, for example, the filtering unit 68 may use other data included in the packet signal, specifically, speed, traveling direction, acceleration, brake, turn signal, hazard, etc., as the filtering condition. . According to this modification, various filtering conditions can be set.

  In the fourth embodiment of the present invention, the filtering unit 68 selects a packet signal that satisfies all of the plurality of filtering conditions. However, the present invention is not limited to this. For example, the filtering unit 68 may select a packet signal that satisfies a predetermined number of filtering conditions. When M filtering conditions are provided, the predetermined number is set as L (L <M). According to this modification, a packet signal can be selected more easily than selecting a packet signal that satisfies all of the plurality of filtering conditions.

  The outline of one embodiment of the present invention is as follows. A radio apparatus according to an aspect of the present invention is a radio apparatus that receives a packet signal from another radio apparatus, and selects a packet signal to be processed from among the packet signals received by the receiver. And a filtering unit. The filtering unit is an extraction unit that extracts position information included in the packet signal received from the reception unit, an acquisition unit that acquires measured position information, and position information acquired by the acquisition unit, A selection unit that selects a packet signal based on the position information extracted by the extraction unit.

  According to this aspect, since the packet signal is selected based on the two pieces of positional information, it is possible to select a packet signal that satisfies a desired positional relationship.

  The selection unit derives the distance between the position information acquired by the acquisition unit and the position information extracted by the extraction unit, and includes the position information extracted by the extraction unit when the distance is shorter than the threshold value The selected packet signal may be selected. In this case, it is possible to select a packet signal from another wireless device existing nearby.

  The selection unit derives a distance between the position information acquired by the acquisition unit and the position information extracted by the extraction unit, and is relative to the position information extracted by the extraction unit from the position information acquired by the acquisition unit. The direction may also be derived, and a packet signal including the position information extracted by the extraction unit may be selected based on the distance and the relative direction. In this case, a packet signal from a radio signal existing at a specific position can be selected.

  Another aspect of the present invention is also a wireless device. This device is a wireless device, and includes a receiving unit that receives packet signals from other wireless devices, and a filtering unit that selects packet signals to be processed among packet signals received by the receiving unit. . The filtering unit includes a determination unit that determines the type of the packet signal received by the reception unit, and a selection unit that selects the packet signal based on the type determined by the determination unit.

  According to this aspect, since a packet signal is selected based on the type of packet signal, a desired type of packet signal can be selected.

  Yet another embodiment of the present invention is also a wireless device. This device is a wireless device, and includes a receiving unit that receives packet signals from other wireless devices, and a filtering unit that selects packet signals to be processed among packet signals received by the receiving unit. . The filtering unit extracts, from the packet signal received by the receiving unit, the type information included in the packet signal and the type information related to an object to be carried by another wireless device, and the extraction unit extracts And a selection unit for selecting a packet signal based on the type information.

  According to this aspect, since the packet signal is selected based on the type information regarding the object to be transported by another wireless device, the packet signal from the desired object to be transported can be selected.

  The filtering unit also performs a packet signal selection process based on another selection criterion. When the packet signal selected by the selection unit is also selected based on another selection criterion, the filtering signal may be finally selected. Good. In this case, since the packet signal is selected based on a plurality of selection criteria, the number of packet signals can be reduced.

  When the number of packet signals selected by the selection unit in the unit period is larger than the threshold value, the filtering unit performs a packet signal selection process according to another selection criterion on the packet signal selected by the selection unit. Also good. In this case, when the number of packet signals is larger than the threshold value, the packet signal is selected according to another selection criterion. Therefore, the number of packet signals can be reduced while suppressing an increase in processing amount.

  10 base station device, 12 vehicle, 14 terminal device, 20 antenna, 22 RF unit, 24 modulation / demodulation unit, 26 processing unit, 28 control unit, 30 network communication unit, 32 frame definition unit, 34 selection unit, 36 generation unit, 50 Antenna, 52 RF unit, 54 modulation / demodulation unit, 56 processing unit, 58 control unit, 60 timing identification unit, 62 transfer determination unit, 64 position information acquisition unit, 66 generation unit, 68 filtering unit, 70 notification unit, 72 extraction unit, 74 carrier sense unit, 80 input unit, 82 position information extraction unit, 84 selection unit, 86 determination unit, 88 selection unit, 90 storage unit, 92 type information extraction unit, 94 selection unit, 96 storage unit, 98 storage unit, 100 Communications system.

  According to the present invention, a desired packet signal can be selected even when packet signals from various wireless devices can be received.

Claims (7)

A wireless device,
A receiver that receives packet signals from other wireless devices;
A filtering unit for selecting a packet signal to be processed among packet signals received by the receiving unit;
The filtering unit includes:
An extraction unit that extracts position information included in the packet signal from the packet signal received by the reception unit;
An acquisition unit for acquiring position information obtained by positioning;
A selection unit that selects a packet signal based on the position information acquired in the acquisition unit and the position information extracted in the extraction unit;
A wireless device comprising:   The selection unit derives a distance between the position information acquired by the acquisition unit and the position information extracted by the extraction unit, and the extraction unit extracts the distance when the distance is shorter than a threshold value. The radio apparatus according to claim 1, wherein a packet signal including position information is selected.   The selection unit derives a distance between the position information acquired in the acquisition unit and the position information extracted in the extraction unit, and the position extracted in the extraction unit from the position information acquired in the acquisition unit The radio signal according to claim 1, wherein a relative direction toward the information is also derived, and a packet signal including the position information extracted by the extraction unit is selected based on the distance and the relative direction. apparatus. A wireless device,
A receiver that receives packet signals from other wireless devices;
A filtering unit for selecting a packet signal to be processed among packet signals received by the receiving unit;
The filtering unit includes:
A determination unit that determines a type of a packet signal received by the reception unit;
A selection unit that selects a packet signal based on the type determined by the determination unit;
A wireless device comprising: A wireless device,
A receiver that receives packet signals from other wireless devices;
A filtering unit for selecting a packet signal to be processed among packet signals received by the receiving unit;
The filtering unit includes:
From the packet signal received by the reception unit, an extraction unit that extracts type information that is type information included in the packet signal and that is to be carried by another wireless device;
Based on the type information extracted by the extraction unit, a selection unit that selects a packet signal;
A wireless device comprising:   The filtering unit also performs a packet signal selection process based on another selection criterion, and finally selects the packet signal when the packet signal selected by the selection unit is also selected based on another selection criterion. The wireless device according to claim 1, wherein the wireless device is a wireless device.   When the number of packet signals selected by the selection unit in a unit period is greater than a threshold, the filtering unit performs packet signal selection processing according to another selection criterion for the packet signal selected by the selection unit. The wireless device according to claim 1, wherein the wireless device is executed.

Images