WO2017130558A1 - Dispositif de radiocommunication - Google Patents

Dispositif de radiocommunication Download PDF

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Publication number
WO2017130558A1
WO2017130558A1 PCT/JP2016/085544 JP2016085544W WO2017130558A1 WO 2017130558 A1 WO2017130558 A1 WO 2017130558A1 JP 2016085544 W JP2016085544 W JP 2016085544W WO 2017130558 A1 WO2017130558 A1 WO 2017130558A1
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WIPO (PCT)
Prior art keywords
wireless communication
position information
information
communication device
management frame
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PCT/JP2016/085544
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English (en)
Japanese (ja)
Inventor
真人 安田
彦 本吉
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日本電気株式会社
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Publication of WO2017130558A1 publication Critical patent/WO2017130558A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H04W4/04—

Definitions

  • the present invention relates to a wireless communication terminal (P2P terminal) that can be wirelessly connected to each other by peer-to-peer (hereinafter referred to as “P2P”), a communication control method and program thereof, a communication method, and a communication system.
  • P2P terminal peer-to-peer
  • the position information is transmitted through a frame exchanged before connecting to another wireless communication device, the position information is transmitted after connecting to another wireless communication device. Thus, it is possible to promptly notify the surrounding wireless communication devices of the position information.
  • An object of the present invention is to provide a wireless communication apparatus that solves the problem described above, that is, it is difficult to promptly notify the surrounding wireless communication apparatus of the latest position information.
  • a wireless communication device includes: A wireless communication device, A position information acquisition unit that periodically acquires position information of the wireless communication device; A communication unit that transmits and receives frames to and from other wireless communication devices; A control unit including the acquired position information in a management frame broadcast between wireless communication devices before connecting to the other wireless communication device, and transmitting by the communication unit; Is provided.
  • a wireless communication method includes: A wireless communication method executed by a wireless communication device having a communication unit that transmits and receives frames to and from other wireless communication devices, Periodically acquiring the position information of the wireless communication device; Before the connection to the other wireless communication device, the communication unit includes the acquired position information and transmits the management frame broadcasted between the wireless communication devices.
  • a program is: A computer constituting the wireless communication device; A position information acquisition unit that periodically acquires position information of the wireless communication device; A communication unit that transmits and receives frames to and from other wireless communication devices; A control unit including the acquired position information in a management frame broadcast between wireless communication devices before connecting to the other wireless communication device, and transmitting by the communication unit; And make it work.
  • the present invention Since the present invention has the above-described configuration, the latest position information can be promptly notified to surrounding wireless communication devices.
  • FIG. 10 is an operation explanatory diagram of Device Discovery of Wi-Fi Direct. It is a figure which shows the format of IE (Information Element) of the management frame of wireless LAN. It is explanatory drawing of the method to compress position information in the 2nd Embodiment of this invention.
  • IE Information Element
  • Wi-Fi Direct is attracting attention for inter-terminal communication is that it uses Wi-Fi, which has a long communication distance. Wi-Fi can communicate up to nearly 100 meters, and can also be applied to communication between cars and between cars and pedestrians.
  • Wi-Fi Direct does not need to start up an access point in advance, and it is determined which becomes an access point by GO Negotiation processing at the time of connection (for example, see Non-Patent Document 2). Therefore, it is more suitable for communication between terminals than conventional Wi-Fi.
  • Wi-Fi Ad-Hoc mode IBSS has been mentioned in Wi-Fi communication so far, but IBSS is not supported by current Android smartphones, while Wi-Fi Direct is standardly supported by Android. Therefore, Wi-Fi Direct is expected to become the mainstream for future inter-terminal communication.
  • Wi-Fi Direct resolves the parent-child relationship with GO Negotiation, the parent terminal becomes Group Owner (GO), starts sending a beacon as an access point, and the child terminal becomes a client (Client). Connected to GO.
  • GO Group Owner
  • Client Client
  • WPS Wi-Fi Protected Setup
  • a client After GO Negotiation is called WPS (Wi-Fi Protected Setup) and consists of Phase1 and Phase2.
  • WPS Phase 1 8-Way Handshake for creating a common key is performed, and in WPS Passe2, 4-Way Handshake for generating a secret key for communication is performed.
  • the second problem is packet loss that occurs in wireless communication.
  • wireless communication a bit error due to radio wave interference occurs, but when the bit error rate is constant, the packet error rate increases in proportion to the packet length. That is, there is a problem that the packet error rate increases as the data size of the position information increases, and there is a greater possibility that packets will be lost in the city center where radio wave interference is large. Since the location information is frequently exchanged, it is necessary to reduce the packet loss probability by suppressing the packet size as much as possible.
  • the third issue is the confidentiality of communications. What is necessary for the security of cars and pedestrians is the reliability of communication, but if the confidentiality of communication cannot be established, a malicious third device notifies the wrong value to ensure safety. There is a high possibility that safety will not be ensured because the function malfunctions or an unreliable vendor reads the wrong value and misdetects the danger. Therefore, it is necessary to have a mechanism that allows only reliable terminals to display and receive location information.
  • the first object of this embodiment is to notify location information as soon as possible by wireless communication between terminals.
  • the second object of the present embodiment is to realize the notification of position information without dropping the position information packet drop rate as much as possible even in an environment where radio wave interference is large.
  • a third object of the present embodiment is to perform notification of position information only between reliable terminals.
  • the first means for solving this problem is to add the current location information of the terminal itself to a wireless LAN management frame such as Probe Request, Probe Response, and Beacon of Wi-Fi, and update it at a constant cycle. Further, when a direction sensor and an acceleration sensor are attached to the GPS sensor in addition to the position information, it is possible to know another terminal approaching the terminal by attaching the information to the management frame.
  • a wireless LAN management frame such as Probe Request, Probe Response, and Beacon of Wi-Fi
  • the second means for solving this problem is to compress position information such as latitude, longitude, direction, and acceleration to the minimum necessary size.
  • the compression method is not particularly limited.
  • an existing compression method for compressing text or the like can be used.
  • the following compression method described in detail in the second and third embodiments of the present invention may be used.
  • One compression method is to reduce the number of digits of position information
  • the second is a method to express position information as a zoom level and 256 ⁇ 256 tile pixel values.
  • the size of the GPS data is reduced by adding to the management frame only the number of digits in a specific range after the decimal point of the GPS data.
  • the direction data can be further reduced by dividing it into 256 ways that can be represented by 8 bits instead of 360 degrees, or smaller numbers.
  • the moving direction of the terminal can be indicated by a value approximated by an azimuth angle obtained by equally dividing 360 degrees into N (N ⁇ 360).
  • N an azimuth angle obtained by equally dividing 360 degrees into N
  • the direction data is not included when it is recognized that the terminal is moving. .
  • Another compression method for compressing the position information is a method of notifying the position information by the pixel value of the Zoom level + 256 ⁇ 256 pixel tile adopted by Google Map.
  • the zoom level is 16
  • the area around Tokyo Station is displayed with 106 pixels of 100m.
  • the width of one 256-pixel tile is 241 m
  • the distance per pixel is 0.94 m. Since the distance of Wi-Fi is about 100 m, if another terminal is in the Zoom level 16, it exists in the same tile or in an adjacent tile, and the pixel value of the Zoom level 16 is notified to where in the tile. Can be identified. Therefore, it is possible to greatly reduce the coordinate information by notifying only the pixel value of the tile at the specific Zoom level.
  • a key is shared between terminals in advance, and the location information field is encrypted / decrypted with the key, so that an untrusted third party can It prevents sending and intercepting information.
  • the terminal acquires the key, and another terminal having the same key decrypts the information encrypted with the key, so that the key is owned.
  • Non-third party terminals can disclose and intercept the terminal position information.
  • the first effect is that by adding location information to management frames such as Probe Request, Probe Response, and Beacon, it is possible to know terminal information immediately after discovering a device without waiting for Wi-Fi connection. That's it.
  • the location information can be obtained only after completing the connection with Wi-Fi Direct over several seconds.
  • Probe Request during Device Discovery processing before Wi-Fi Direct connection, When the probe response handshake is completed and the device is discovered, the position information of the other party can be known.
  • GAS Generic advertisement service
  • the second effect is that it is possible to reduce the packet drop rate by reducing the size of the location information.
  • Location information is frequently exchanged to ensure safety. However, if a packet is lost, the time until the information is transmitted for retransmission processing may be delayed, so it may be possible to notify location information in an emergency.
  • the third effect is that the reliability of location information is high.
  • the location information is encrypted / decrypted between the terminals having the key acquired from the authentication server in advance and notified, the unreliable third party who does not have the key Information cannot be encrypted. Further, since a third party who does not have a key does not have a key and cannot decrypt the field of position information, it is possible to prevent the position information from being known and misused in this embodiment.
  • the wireless terminal 10 sends a management frame for wireless LAN to the peripheral terminals.
  • the management frame transmitted in the present embodiment is a probe request exchanged in Wi-Fi Direct Device Discovery.
  • Wi-Fi Direct Device Discovery it is not limited to Wi-Fi Direct as long as it can communicate with other wireless terminals, and a Wi-Fi management frame such as Beacon other than Probe Request / Response may be used.
  • the wireless terminal 10 is mounted on the automobile 10A, and is a dedicated wireless terminal that executes a specific service mounted by a reliable organization such as an automobile manufacturer.
  • the wireless terminal 10 has a device for performing wireless LAN communication, a device for performing cellular communication, and a GPS sensor for communicating with an artificial satellite to acquire position information.
  • the wireless terminal 10 collects position information from the GPS sensor at regular intervals.
  • the wireless terminal 10 registers the collected location information as additional information in the Probe Request / Probe Response frame, thereby notifying the surroundings of the location information of the automobile 10A. Further, every time the location information is updated, the wireless terminal 10 updates the content of the additional information registered in the frame so as to always notify the periphery of the latest location information of the automobile 10A.
  • the wireless terminal 20 is mounted on the automobile 20A. Similar to the wireless terminal 10, the wireless terminal 20 is a dedicated wireless terminal that executes a specific service installed by a reliable organization such as an automobile manufacturer. This terminal also has a device that performs wireless LAN communication, a device that performs cellular communication, and a GPS sensor that acquires position information by communicating with artificial satellites, as in the case of the wireless terminal 10, and Probe Request / Probe at regular intervals. The position information is given to the response frame and notified to the surroundings.
  • the wireless terminal 30 is a portable wireless terminal such as a smartphone owned by the pedestrian 30A. Similar to the wireless terminals 10 and 20, the wireless terminal 30 is also equipped with a wireless LAN, a cellular communication device, and a GPS sensor. The wireless terminal 30 adds its own position information to the Probe Request / Probe Response frame and notifies the surroundings.
  • wireless terminals 10, 20, 30 access an authentication server 40 on the Internet via a cellular communication network to obtain key data and assign location information to a Probe Request / Probe Response frame, the key data Use to encrypt the key. Further, when the wireless terminals 10, 20, 30 acquire key information from other terminals, the wireless terminals 10, 20, 30 decrypt the key using the key data acquired from the authentication server 40.
  • the wireless terminals 10, 20, 30 also acquire the position information compression method from the authentication server 40.
  • the radio terminals 10, 20, and 30 compress the position information according to the acquired compression method.
  • the wireless terminals 10, 20, and 30 encrypt the position information after compression with the key information and notify the peripheral terminals.
  • the wireless terminals 10, 20, and 30 exchange position information only with the handshake of the Device Discovery operation without waiting for the completion of Wi-Fi Direct connection establishment.
  • the position information can be exchanged much faster than the conventional method in which the position information is exchanged after the connection establishment is completed.
  • the wireless terminals 10, 20, and 30 acquire the compression method from the authentication server and compress the position information, thereby reducing the packet size and the packet error rate.
  • the wireless terminals 10, 20, and 30 acquire key information from the authentication server, and encrypt / decrypt position information with a common key. Therefore, it is possible to prevent an untrusted third party terminal that cannot access the authentication server from intercepting the data of the position information.
  • the wireless terminals 10 and 20 and the wireless terminal 30 have different uses from the vehicle-mounted device and the smartphone, respectively, but have the same internal components.
  • the wireless terminal includes an application unit A1, a control unit A2, a storage unit A3, a GPS sensor A4, a wireless LAN device A5, and a cellular communication device A6.
  • the application unit A1 includes the control of the present invention, and instructs to acquire position information, compress, encrypt, add to a management frame, and control Wi-Fi Direct.
  • the control unit A2 performs specific packet processing such as generation of a Wi-Fi Direct frame and exchange of Probe Request / Response.
  • the storage unit A3 is referred to by the application unit A1 and the control unit A2, and holds storage information necessary for each process.
  • the GPS sensor A4 communicates with the artificial satellite to acquire the latitude and longitude and the position information that has been obtained.
  • the GPS sensor A4 also includes an acceleration sensor and a direction sensor, and notifies the application unit A1 of the current terminal acceleration and its direction together with the position information.
  • the wireless LAN device A5 is used for inter-terminal communication of Wi-Fi Direct.
  • the probe request / response handshake between terminals is also performed via the device A5.
  • the cellular communication device A6 is used to connect to the Internet via a cellular network such as 3G or LTE. Connection to the authentication server is made via the cellular communication device A6.
  • the wireless terminal shown in FIG. 2 can be realized by, for example, a computer having a communication function and a program.
  • the program is provided by being recorded on a computer-readable recording medium, and is read by the computer when the computer is started up.
  • the application unit A1, the control unit A2, the storage unit A3, A GPS sensor A4, a wireless LAN device A5, and a cellular communication device A6 are realized.
  • FIG. 3 shows the flow of operation of the first embodiment.
  • the wireless terminals 10, 20, and 30 access the authentication server 40 and acquire the compression method and key information of the position information from the authentication server 40 (flow 101).
  • the wireless terminals 10, 20, and 30 acquire the latitude and longitude position information from the GPS sensor (flow 102).
  • the wireless terminals 10, 20, and 30 acquire the information such as acceleration and direction as well as the position information that the GPS sensor has performed with the latitude and longitude, as long as the information can be acquired.
  • This compression method may be any method as long as it is a compression method common to wireless terminals authenticated by the authentication server.
  • the wireless terminals 10, 20, and 30 encrypt the position information with the key information acquired from the authentication server (flow 104).
  • the wireless terminals 10, 20, and 30 register the encrypted position information as additional information at the end of the Probe Request / Response frame.
  • a commercially available Wi-Fi device has a mechanism that can be added as an IE (Information Element) at the end of a Wi-Fi management frame.
  • the wireless terminals 10, 20, and 30 register the additional information as IEs in the Probe Request / Probe Response frame (flow 105).
  • the wireless terminals 10, 20, and 30 After registering the additional information, the wireless terminals 10, 20, and 30 perform Device Discovery processing (Flow 106). As described in FIG. 4, this is a system in which a terminal switches a channel, broadcasts a Probe Request, and receives nearby Probe terminals by receiving a Probe Response.
  • position information is attached as additional information to the Probe Request / Probe Response.
  • the wireless terminals 10, 20, and 30 can know the location information of the found terminal at the time of finding the terminal by Device Discovery.
  • the wireless terminals 10, 20, and 30 wait for a probe response to the probe request (flow 107), and when receiving the probe response, acquire the position information field from the IE of the probe response.
  • the wireless terminals 10, 20, and 30 decrypt the information with the common key acquired from the authentication server (flow 108), and decompress the information with the common rule (flow 109). Thereby, the wireless terminals 10, 20, and 30 can know the location information of the peripheral terminals before performing the Wi-Fi authentication process.
  • the wireless terminals 10, 20, and 30 search for peripheral terminals using Device Discovery, and then wait for a predetermined time (flow 110), and return to the GPS data acquisition process (flow 102). By repeating this process, the wireless terminals 10, 20, and 30 can periodically update the position information of the peripheral terminals.
  • Wi-Fi Direct Device Discovery operation will be explained. This operation conforms to the Wi-Fi Direct standard.
  • the operation of Device Discovery of the terminal 10 and the terminal 20 is given as an example.
  • the application unit of terminal 10 and terminal 20 issues a search start command to the control unit.
  • the terminal 10 and the terminal 20 register additional data including the position information in the device driver before sending out the Probe Request / Probe Response.
  • the control unit of the terminal 10 and the terminal 20 searches for an adjacent device while repeating the Search state and the Listen state.
  • the control unit sends a Probe Request while switching channels 1, 6, and 11 and waits for a response. If a response is returned, the control unit notifies the application unit to that effect.
  • the control unit transits to the Listen state, and during a random time of 100 to 200 milliseconds, the probe from the opposite host is selected on a specific channel selected from among the channels 1, 6, and 11. Wait for Request. If the control unit receives a probe request, it returns a probe response.
  • the control unit performs a Probe Request / Probe Response handshake with an adjacent device by this Device Discovery process, and discovers the adjacent device.
  • Wireless LAN management frames such as Probe Request / Probe Response and Beacon frames can have additional information called IE (Information Element).
  • the IE format is shown in FIG.
  • IE is a variable-length format composed of three elements: a 1-byte field ID, a 1-byte field length, and content having a size defined by the field length.
  • IE is a variable length format. Therefore, even if the transmission information is compressed with an arbitrary value on the transmission side, the information can be acquired on the reception side.
  • any terminal including an unauthenticated terminal can know that this field exists and its location. However, since the contents of this field are encrypted, only the terminal that has accessed the authentication server can read the value.
  • the second embodiment is basically the same in configuration and operation as the first embodiment, but has a feature in the compression method of the position information to be given to the probe request / probe response.
  • the radio wave of the wireless LAN used for terminal-to-terminal communication flies only up to about 100m. For this reason, in a plurality of terminals that can receive wireless LAN radio waves from each other, the value of the latitude / longitude of the user and the value of the latitude / longitude of the other party should be the same in the number of digits of the decimal point. Also, since the difference in the number of digits with a large decimal point falls within the range of the GPS error number m, it is meaningless to notify the large number of digits. For this reason, in the present embodiment, the position information is reduced by sending only the range of the number of digits of the decimal point as the latitude and longitude information.
  • Figure 6 gives examples of latitude and longitude differences and distances.
  • the latitude of Tokyo Station is 35.681381, and the longitude is 139.766083 (rounded down to the seventh decimal place).
  • the distance between the coordinates of Tokyo Station and the coordinates increased by 0.001 (latitude: 35.6822381, longitude: 139.766083) is approximately 85 m. Therefore, the difference in latitude and the difference in distance are shifted in units of 8.5 m at the fourth decimal point and 0.85 m at the fifth decimal point. That is, two coordinates that have the same longitude but differ by 1 in the fourth decimal point are separated by 8.5 m. Also, two coordinates having the same longitude and a difference of 1 in the fifth decimal point are separated by 0.85 m.
  • the maximum reach of wireless LAN radio waves is about 100 m at most, and even if extended, there is no flight distance of about 850 m corresponding to the second decimal place of latitude. Therefore, it can be said that the latitude does not change the number of digits larger than the third decimal point except for a partial boundary condition in which the second digit of the decimal point changes between terminals.
  • the GPS error is several meters, it can be said that the number of digits smaller than the fifth decimal place can be ignored. Also, when there is a boundary condition that changes the second digit of the decimal point, whether the absolute value of the difference of the third decimal point is greater than a specific value, and whether the second decimal point value of the terminal is close to 0, By determining whether they are close, it is possible to predict whether the value of the second decimal place of the partner terminal is the value +1 or ⁇ 1 of the own terminal. If the maximum reachable distance of radio waves is less than 200 m, the specific value is 2. The reason is that if the reach of radio waves is less than 200 m, the absolute value of the difference of the third decimal place does not exceed 3 except for boundary conditions. Therefore, it can be said that it is only necessary to send the latitude from the third to fifth decimal places.
  • the distance between the coordinates of Tokyo Station and the coordinates increased only by 0.001 (latitude: 35.681381, longitude: 139.767083) is 111 m. Therefore, it can be said that the third decimal place is 111 m, the fourth decimal place is 11.1 m, and the fifth decimal place is 1.1 m.
  • FIG. 7 shows an example of the actual operation of the number of digits in the second embodiment.
  • the wireless terminal 10 and the wireless terminal 20 exist within the reach of wireless LAN radio waves.
  • the wireless terminal 10 and the wireless terminal 20 send from the authentication server 40 to each other only the effective number of coordinates of latitude and longitude, and the number of effective digits is, for example, both the latitude and longitude from the third decimal place to the fifth decimal place.
  • the wireless terminal 10 uses the third to fifth decimal places (357, 096) as its own latitude and longitude information to obtain a Probe Request / Probe Response. To grant.
  • the wireless terminal 20 obtains the information of the wireless terminal 10 from the position information of the terminal itself and the received information.
  • the wireless terminal 20 obtains the absolute value of the difference between the third decimal point of the latitude of the terminal 20 and the third decimal point of the latitude of the wireless terminal 10, and if the value is 2 or less, the wireless terminal The latitude value having a number of digits larger than the third decimal place of 10 is determined to be the same value as the terminal 20 itself. However, if the absolute value of the difference is 3 or more, the wireless terminal 20 has the same latitude value as that of the terminal 20 as the latitude value of the number of digits larger than the second decimal point of the wireless terminal 10. Is a value obtained by adding +1 or ⁇ 1 to the second decimal place value of the terminal 20.
  • Whether the wireless terminal 20 is +1 or ⁇ 1 can be determined by, for example, the value of the third decimal point of the terminal 20 and the value of the third decimal point of the wireless terminal 10. For example, the wireless terminal 20 sets ⁇ 1 if the value of the third decimal place of the terminal 20 is close to 0, and +1 if the value is close to 9.
  • the wireless terminal 20 is the third decimal point of the wireless terminal 10. It is determined that the longitude value having a larger number of digits is the same value as that of the terminal 20 itself. However, if the absolute value of the difference is 3 or more, the wireless terminal 20 has the same longitude value as that of its own terminal 20 for the longitude value larger than the second decimal place of the wireless terminal 10, but the second decimal place. Is a value obtained by adding +1 or ⁇ 1 to the second decimal place value of the terminal 20.
  • Whether the wireless terminal 20 is +1 or ⁇ 1 can be determined by, for example, the value of the third decimal point of the terminal 20 and the value of the third decimal point of the wireless terminal 10. For example, the wireless terminal 20 sets ⁇ 1 if the value of the third decimal place of the terminal 20 is close to 0, and +1 if the value is close to 9.
  • the wireless terminal 20 ignores the value larger than the third to fifth decimal points as its own value, and the smaller value is less than the GPS error.
  • the position of the wireless terminal 10 is obtained as (35.68357, 139.777096).
  • the position information to be assigned to the Probe Request / Probe Response is indicated by the pixel level of the tile level and the tile level belonging to the Google Map or OpenStreammap algorithm of latitude and longitude, not the latitude and longitude.
  • the map data of GoogleMap and OpenStreammap is composed of an array of tiles composed of 256 pixels ⁇ 256 pixels, and on the Web screen, tile images corresponding to the respective Zoom levels are displayed.
  • the terminal reduces the position information data by notifying the position information of the own terminal not by the latitude and longitude values but by the pixel values (coordinate values) of the coordinates on the tiles of a specific Zoom level. That's it.
  • the terminal notifies only the pixel value of the tile in which the self of the Zoom level 16 exists as the coordinate of the self terminal, thereby reducing the position information data. Further, since the pixel value (coordinate value) can be represented by 0-255, the X coordinate and the Y coordinate are each contained in 1 byte. Therefore, in this embodiment, the terminal can notify its own position with very small information of 2 bytes.
  • the wireless terminal 10 acquires the pixel value of its own tile from the Google Map API for its latitude and longitude.
  • the value of (230, 230) is set to a 2-byte byte string and notified to the peripheral terminals. It is assumed that the position information to be notified is acquired from the authentication server 40 in advance from the authentication server 40 that the Google Map pixel value and the Zoom level 16 are used.
  • the radio terminal 10 has the same tile as the surrounding terminal from the radio wave reach if the coordinates of the peripheral terminal are (10,230), for example. It can be specified that the Y coordinate is the same and the X coordinate is located in the next tile. Specifically, (10,230) on the same tile is 220 pixels away, while (10,230) on the adjacent tile is only 36 pixels away from the wireless terminal 10. For this reason, the former is approximately 451 m away from the wireless LAN radio wave reach, while the latter is approximately 68 m within the wireless LAN reach.
  • the wireless terminal 10 specifies that the wireless terminal 30 is in the same tile as the wireless terminal 10. The reason is that the terminals having the position information of (230, 240) and being within the radio wave range of the wireless terminal 10 and the wireless LAN are only terminals on the same tile as the wireless terminal 10.
  • This method can reduce the position information data to 2 bytes, greatly reducing the amount of additional information of the position information and preventing an increase in the packet rate.
  • the Search / Listen state is mutated randomly between 100 ms and 200 ms.
  • the terminal updates the position information of the terminal at intervals of, for example, 50 milliseconds, and sets a time range for changing the state from, for example, 50 milliseconds. Vary in the range of 100 milliseconds.
  • the terminal increases the transmission frequency of management frames such as Probe Request / Probe Response by shortening the transmission interval of management frames.
  • management frames such as Probe Request / Probe Response
  • the terminal it is determined whether there is a possibility of a collision from the position information and movement direction information of the surrounding terminals, or the movement of the position information for each time, and the attached terminal information. If it is determined that there is a possibility, the management frame transmission interval may be shortened.
  • the terminal embeds a flag indicating the type of its own terminal.
  • the terminal embeds a flag indicating the type of its own terminal.
  • the terminal can know each other in more detail by including the attached information indicating the type of the mobile object or the fixed object on which the terminal is mounted in the management frame.
  • the terminal embeds information about a future direction as to whether the car on which the terminal is mounted will turn left at the next intersection as a flag. Even with this information, it is possible to know more detailed information about the safety between the terminals approaching. In other words, the terminals can know each other in more detail by including the attached information indicating the moving direction in the near future of the mobile body on which the terminals are mounted in the management frame. For example, in the case of a terminal mounted in a car, whether to turn left, turn right, or go straight at the next intersection can be predicted by detecting the differential state of the car direction indicator with a sensor. Further, when route guidance is being executed by car navigation, the terminal can predict by detecting the set route.
  • the wireless communication apparatus 200 includes a position information acquisition unit 201, a communication unit 202, and a control unit 203.
  • the location information acquisition unit 201 has a function of periodically acquiring location information of the wireless communication device 200.
  • the communication unit 202 has a function of transmitting / receiving a frame to / from another wireless communication device.
  • the control unit 203 has a function of transmitting, by the communication unit 202, the position information acquired by the position information acquisition unit 201 in the management frame broadcast between the wireless communication devices before connecting to another wireless communication device.
  • the wireless communication apparatus 200 having the above-described configuration operates as follows. That is, the position information acquisition unit 201 periodically acquires the position information of the wireless communication device 200, and the control unit 203 adds the management frame broadcast between the wireless communication devices before connecting to the other wireless communication device. The communication unit 202 transmits the acquired position information.
  • the wireless communication device 200 can promptly notify the latest wireless communication devices of the latest location information by being configured and operating as described above.
  • the reason is that the position information of the wireless communication device 200 is periodically acquired and transmitted to the surroundings including the acquired position information in a management frame broadcast between the wireless communication devices before connecting to another wireless communication device. It is to do.
  • FIG. 10 shows an example of the hardware configuration of the wireless communication apparatus 200.
  • the wireless communication apparatus 200 includes an information processing apparatus 120 including an arithmetic processing unit 121 such as one or more microprocessors, a storage unit 122 such as a memory or a hard disk, and a communication module 123, a program 124, and the like. Can be realized.
  • the communication module 123 is used for communication between the wireless communication devices 200.
  • the communication module 123 is a module that performs wireless communication using a Wi-Fi Direct protocol.
  • the program 124 is read from an external computer-readable recording medium into the memory when the information processing apparatus 120 is started up, and the position information is acquired on the arithmetic processing unit 121 by controlling the operation of the arithmetic processing unit 121.
  • Functional units such as the unit 201, the communication unit 202, and the control unit 203 are realized.
  • the wireless terminals shown in the first to sixth embodiments can also be realized by hardware similar to FIG.
  • a wireless communication device A position information acquisition unit that periodically acquires position information of the wireless communication device; A communication unit that transmits and receives frames to and from other wireless communication devices; A control unit including the acquired position information in a management frame broadcast between wireless communication devices before connecting to the other wireless communication device, and transmitting by the communication unit;
  • a wireless communication device comprising: [Appendix 2] The position information acquisition unit periodically acquires position information including latitude and longitude of the wireless communication device, The control unit, as the position information included in the management frame, the position information obtained by removing information of digits other than the predetermined digits below the decimal point in latitude and longitude from the acquired position information, The wireless communication device according to attachment 1.
  • the position information acquisition unit periodically acquires position information including latitude and longitude of the wireless communication device,
  • the control unit uses the coordinate value of a tile at a predetermined zoom level corresponding to the latitude and longitude included in the acquired position information as the position information included in the management frame.
  • the wireless communication apparatus according to appendix 1 or 2.
  • the control unit accesses an authentication server, acquires key information from the authentication server at the time of authentication, encrypts the acquired position information with the key information, and includes the encrypted position information in the management frame Location information,
  • the wireless communication device according to any one of appendices 1 to 3.
  • the control unit accesses an authentication server, acquires an information compression rule from the authentication server at the time of authentication, compresses the acquired position information according to the acquired rule, and converts the compressed position information into the management frame.
  • the position information to be included in The wireless communication device according to any one of appendices 1 to 4.
  • the control unit accesses the authentication server when the authentication server exists, acquires key information and information compression rules from the authentication server at the time of authentication, and when the authentication server does not exist, The key information and the rule are acquired from a communication terminal, the acquired location information is compressed according to the acquired rule, the compressed location information is encrypted with the key information, and the encrypted location information is The location information to be included in the management frame, The wireless communication device according to any one of appendices 1 to 5.
  • the control unit includes, in the management frame, attached information indicating a type of a moving object or a fixed object on which the wireless communication device is mounted. The wireless communication device according to any one of appendices 1 to 6.
  • the control unit includes, in the management frame, attached information indicating a moving direction in the near future of a moving body on which the wireless communication device is mounted.
  • the wireless communication device according to any one of appendices 1 to 7.
  • the control unit includes, in the management frame, additional information indicating a moving direction of the wireless communication device by a value approximated by an angle of azimuth obtained by equally dividing 360 degrees into N (N ⁇ 360).
  • the wireless communication device according to any one of appendices 1 to 8.
  • the control unit acquires the position information included in the management frame received from the other wireless communication device by the communication unit, and acquires the acquired position information of the other wireless communication device and the acquired wireless communication.
  • the wireless communication device Based on the relative distance between the wireless communication apparatus and the other wireless communication apparatus determined from the position information of the apparatus, at least of the acquisition period of the position information by the position information acquisition unit and the transmission period of the management frame Control one side, The wireless communication device according to any one of appendices 1 to 9.
  • the control unit acquires the position information included in the management frame received from the other wireless communication device by the communication unit;
  • the wireless communication device according to any one of appendices 1 to 10.
  • the control unit is based on a value of a predetermined digit indicated by the location information included in the management frame received from the other radio communication device and the latitude and longitude of the radio communication device acquired by the location information acquisition unit.
  • the control unit includes the other wireless communication unit based on the coordinate value of the tile included in the management frame received from the other wireless communication device and the latitude and longitude of the wireless communication device acquired by the position information acquisition unit. Calculate the latitude and longitude of the communication device, The wireless communication device according to any one of appendices 1 to 12.
  • Appendix 14 It is a communication device of a system that connects adjacent wireless terminals and builds a group, and adds its location information and attached information acquired from the GPS sensor to the management frame exchanged between the terminals before connecting, and periodically A communication device that broadcasts the updated location information and informs the peripheral terminals of the location information by receiving a management frame provided with the location information by a peripheral wireless terminal that is not connected.
  • the wireless terminal described in appendix 14 accesses the authentication server, acquires key information from the authentication server at the time of authentication, encrypts the position information of the own terminal with the key information acquired from the authentication server, and manages the encrypted position information
  • the receiving terminal that receives the management frame by adding to the frame and transmitting the broadcast receives the key information at the time of authentication of the authentication server, and decrypts the position information encrypted by using the key information, thereby concealing the position information.
  • Communication device [Appendix 16] The wireless terminals according to attachments 14 and 15 obtain a common rule for compressing information on location information from the authentication server, compress the location information to be transmitted in accordance with the common rule, and the transmitted location information is the original when received.
  • a communication device that reduces the size of position information by returning to [Appendix 17] If there is no authentication server, the key information for encrypting the location information of the wireless terminal described in appendices 14 to 16 and the location information compression rule are acquired from another terminal that belonged to the group connected in the past Notification device.
  • Appendix 18 The compression rules described in Appendices 16 and 17 share in advance that only digits in a specific range of latitude and longitude to be transmitted and received are transmitted, and the wireless terminal transmits only the values of digits in a specific range of position information, The received terminal replaces the specified range of digits in the latitude and longitude information of its own terminal with the value received from the transmitting terminal, and knows the location information of the transmitting terminal by discarding digits smaller than the replaced value. Communication device.
  • Appendix 19 The compression rules described in Appendices 16 and 17 share the information that the specific Zoom level used in the Google Map and OpenstreetMAP algorithms is sent and only the coordinates of tiles composed of 256 x 256 pixels are sent.
  • the transmitting terminal obtains the tiled coordinates to which the terminal belongs at a specific zoom level from its latitude and longitude, and transmits the coordinates, and the receiving terminal uses the received coordinates, the zoom level, and the current use.
  • a communication device characterized by knowing the latitude and longitude of a transmitting terminal from the maximum reach of radio waves of a wireless terminal.
  • Appendix 22 The communication apparatus according to appendix 14, wherein the attached information includes a moving direction of the terminal, and the amount of information is reduced by dividing the angle information indicating the direction into a specific number to be shared in advance.
  • Appendix 23 A terminal that has received the direction information described in Appendices 14 to 22 is likely to collide with the position information and direction information of surrounding terminals, or the movement of the position information over time, and the terminal information attached.
  • a wireless device characterized by shortening the transmission interval of management frames when it is determined that there is a possibility of a collision.
  • Appendix 25 In the acquisition of the location information, periodically acquire location information including the latitude and longitude of the wireless communication device, In the transmission of the management frame, as the position information to be included in the management frame, the position information obtained by removing information of digits other than the predetermined digits below the decimal point in latitude and longitude from the acquired position information, The wireless communication method according to attachment 24.
  • [Appendix 26] In the acquisition of the location information, periodically acquire location information including the latitude and longitude of the wireless communication device, In the transmission of the management frame, the coordinate information of tiles of a predetermined zoom level corresponding to the latitude and longitude included in the acquired position information is used as the position information included in the management frame.
  • the wireless communication method according to appendix 24 or 25.
  • [Appendix 27] In transmission of the management frame, the authentication server is accessed, key information is acquired from the authentication server at the time of authentication, the acquired position information is encrypted with the key information, and the encrypted position information is stored in the management frame.
  • the location information to include 27.
  • an authentication server In transmission of the management frame, an authentication server is accessed, an information compression rule is acquired from the authentication server at the time of authentication, the acquired position information is compressed according to the acquired rule, and the compressed position information is The location information to be included in the management frame, 28.
  • the wireless communication method according to any one of appendices 24 to 27.
  • Appendix 29 In the transmission of the management frame, when the authentication server exists, the authentication server is accessed, the key information and the information compression rule are acquired from the authentication server at the time of authentication, and when the authentication server does not exist, the connection is made in the past.
  • a wireless communication method according to any one of appendices 24 to 28.
  • included in the management frame is additional information indicating the type of mobile or fixed object on which the wireless communication device is mounted.
  • the wireless communication method according to any one of appendices 24 to 29.
  • the management frame includes attached information indicating a moving direction in the near future of the mobile body on which the wireless communication device is mounted.
  • the wireless communication method according to any one of appendices 24 to 30.
  • the management frame includes attached information indicating a moving direction of the wireless communication device by a value approximated by an angle of azimuth obtained by dividing 360 degrees into N (N ⁇ 360). 32.
  • the wireless communication method according to any one of appendices 24 to 31.
  • the communication unit acquires the position information included in the management frame received from the other wireless communication device, and acquires the acquired position information of the other wireless communication device and the acquired position information of the wireless communication device. Controlling at least one of a position information acquisition period and a management frame transmission period by the position information acquisition unit based on a relative distance between the wireless communication apparatus and the other wireless communication apparatus determined from 33.
  • a wireless communication method according to any one of appendices 24 to 32.
  • Appendix 34 Obtaining the location information included in the management frame received from the other wireless communication device by the communication unit; 34.
  • the wireless communication method according to any one of appendices 24 to 33.
  • Appendix 35 Based on the value of a predetermined digit indicated by the position information included in the management frame received from the other wireless communication apparatus and the latitude and longitude of the wireless communication apparatus acquired by the position information acquisition unit, the other Calculating the latitude and longitude of the wireless communication device, The wireless communication method according to any one of appendices 24 to 34.
  • [Appendix 36] Based on the coordinate value of the tile included in the management frame received from the other wireless communication device and the latitude and longitude of the wireless communication device acquired by the position information acquisition unit, Calculate longitude, The wireless communication method according to any one of appendices 24 to 35.
  • [Appendix 37] A computer constituting the wireless communication device; A position information acquisition unit that periodically acquires position information of the wireless communication device; A communication unit that transmits and receives frames to and from other wireless communication devices; A control unit including the acquired position information in a management frame broadcast between wireless communication devices before connecting to the other wireless communication device, and transmitting by the communication unit; Program to make it function.
  • the position information acquisition unit periodically acquires position information including latitude and longitude of the wireless communication device, The control unit, as the position information included in the management frame, the position information obtained by removing information of digits other than the predetermined digits below the decimal point in latitude and longitude from the acquired position information, The program according to appendix 37.
  • the position information acquisition unit periodically acquires position information including latitude and longitude of the wireless communication device, The control unit uses the coordinate value of a tile at a predetermined zoom level corresponding to the latitude and longitude included in the acquired position information as the position information included in the management frame.
  • the program according to appendix 37 or 38 is the program according to appendix 37 or 38.
  • the control unit accesses an authentication server, acquires key information from the authentication server at the time of authentication, encrypts the acquired position information with the key information, and includes the encrypted position information in the management frame Location information, 40.
  • the program according to any one of appendices 37 to 39.
  • the control unit accesses an authentication server, acquires an information compression rule from the authentication server at the time of authentication, compresses the acquired position information according to the acquired rule, and converts the compressed position information into the management frame.
  • the control unit accesses the authentication server when the authentication server exists, acquires key information and information compression rules from the authentication server at the time of authentication, and when the authentication server does not exist,
  • the key information and the rule are acquired from a communication terminal, the acquired location information is compressed according to the acquired rule, the compressed location information is encrypted with the key information, and the encrypted location information is The location information to be included in the management frame, 42.
  • the control unit includes, in the management frame, attached information indicating a type of a moving object or a fixed object on which the wireless communication device is mounted.
  • the program according to any one of appendices 37 to 42 is
  • the control unit includes, in the management frame, attached information indicating a moving direction in the near future of a moving body on which the wireless communication device is mounted.
  • the control unit includes, in the management frame, additional information indicating a moving direction of the wireless communication device by a value approximated by an angle of azimuth obtained by equally dividing 360 degrees into N (N ⁇ 360). 45.
  • the control unit acquires the position information included in the management frame received from the other wireless communication device by the communication unit, and acquires the acquired position information of the other wireless communication device and the acquired wireless communication.
  • the control unit acquires the position information included in the management frame received from the other wireless communication device by the communication unit; 47.
  • the control unit is based on a value of a predetermined digit indicated by the location information included in the management frame received from the other radio communication device and the latitude and longitude of the radio communication device acquired by the location information acquisition unit.
  • the control unit includes the other wireless communication unit based on the coordinate value of the tile included in the management frame received from the other wireless communication device and the latitude and longitude of the wireless communication device acquired by the position information acquisition unit. Calculate the latitude and longitude of the communication device, 48.
  • Authentication server A1 Application unit A2: Control unit A3: Storage unit A4: GPS sensor A5: Wireless LAN device A6: Cellular communication devices 101-110 :flow

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif de radiocommunication qui comprend : une unité d'acquisition d'informations de localisation qui acquiert périodiquement des informations de localisation concernant le dispositif de radiocommunication ; une unité de communication qui transmet et reçoit des trames vers ou depuis un autre dispositif de radiocommunication ; et une unité de commande qui incorpore les informations de localisation acquises dans une trame de gestion destinée à être diffusée entre les dispositifs de radiocommunication, avant connexion à l'autre dispositif de radiocommunication, et amène la trame de gestion à être transmise par l'unité de communication.
PCT/JP2016/085544 2016-01-29 2016-11-30 Dispositif de radiocommunication WO2017130558A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020044461A1 (fr) * 2018-08-29 2020-03-05 京セラ株式会社 Outil et dispositif de communication
WO2021070488A1 (fr) * 2019-10-11 2021-04-15 株式会社デンソー Dispositif de communication véhiculaire et procédé de communication véhiculaire

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Publication number Priority date Publication date Assignee Title
WO2009107297A1 (fr) * 2008-02-25 2009-09-03 三菱電機株式会社 Dispositif de communication monté dans un véhicule
JP2014187501A (ja) * 2013-03-22 2014-10-02 Denso Corp データ伝送システム
WO2015165002A1 (fr) * 2014-04-28 2015-11-05 Harman International Industries, Incorporated Détection de piétons

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107297A1 (fr) * 2008-02-25 2009-09-03 三菱電機株式会社 Dispositif de communication monté dans un véhicule
JP2014187501A (ja) * 2013-03-22 2014-10-02 Denso Corp データ伝送システム
WO2015165002A1 (fr) * 2014-04-28 2015-11-05 Harman International Industries, Incorporated Détection de piétons

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020044461A1 (fr) * 2018-08-29 2020-03-05 京セラ株式会社 Outil et dispositif de communication
WO2021070488A1 (fr) * 2019-10-11 2021-04-15 株式会社デンソー Dispositif de communication véhiculaire et procédé de communication véhiculaire
JP2021064134A (ja) * 2019-10-11 2021-04-22 株式会社デンソー 車両用通信装置及び車両用通信方法
JP7136062B2 (ja) 2019-10-11 2022-09-13 株式会社デンソー 車両用通信装置及び車両用通信方法

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