JP4841503B2 - Mobile communication device and address management device - Google Patents

Description

  The present invention relates to a mobile unit-mounted communication apparatus that is mounted on a mobile unit and transmits packet information including information about the mobile unit.

  An inter-vehicle communication system that includes a plurality of in-vehicle communication devices each mounted on a vehicle and in which the plurality of in-vehicle communication devices transmit and receive packet information to each other is widely known. The in-vehicle communication device transmits packet information including information regarding the vehicle on which the in-vehicle communication device is mounted, including an address assigned to the in-vehicle communication device as a transmission source address. The other in-vehicle communication device that has received the packet information specifies the in-vehicle communication device that has transmitted the packet information based on the transmission source address included therein, and acquires information about the vehicle on which the specified in-vehicle communication device is mounted. When the other in-vehicle communication device transmits another packet information with the in-vehicle communication device that transmitted the packet information as a destination, the packet including the transmission source address included in the received packet information as the destination address Send information.

JP 2006-325019 A

  Thus, the packet information used in the inter-vehicle communication system includes a transmission source address for identifying the in-vehicle communication device that has transmitted the packet information. In order to identify the in-vehicle communication device that has transmitted the packet information, it may be preferable to always set the address uniquely assigned to the in-vehicle communication device as the transmission source address.

  However, if an address uniquely assigned to the in-vehicle communication device is used as a transmission source address, it is necessary to perform communication by detecting the position of the in-vehicle communication device that transmits packet information including the same transmission source address. It is possible to track the travel route of the vehicle over a long period exceeding time. This may infringe the privacy of the vehicle user.

  The present invention has been made for such a problem. That is, an object of the present invention is to make it difficult to track a moving path of a moving body over a long period of time in a mobile mounting communication apparatus mounted on a moving body such as a vehicle.

The present invention is a mobile unit-mounted communication device that is mounted on a mobile unit and transmits / receives packet information, and a borrowed address acquisition unit that acquires the loan address as a borrowed address from an address management device that manages the loan address; A borrowing time zone information obtaining unit that obtains information indicating a borrowing time zone defined as a time zone in which a borrowed address can be used from the address management device, and includes information on the borrowed address and the mobile object A transmitting unit that transmits packet information in a borrowing time zone specified for the borrowed address, a requested borrowing time zone determining unit that decides a time zone in which the borrowed address is borrowed as the borrowed address, and the loan address Address request for transmitting address request information requesting allocation to the time zone determined by the request borrowing time zone determination unit The borrowed address obtaining unit obtains the loan address as a borrowed address from the address management device that has responded to the address request information, and the borrowed time zone information obtaining unit includes the address request information in the address request information. The information indicating the borrowed time zone is acquired from the address management device that has responded .

Further, the present invention is an address management device that assigns an address to a mobile unit-mounted communication device mounted on a mobile unit, the loan address storage unit that stores a loan address to be allocated to the mobile unit-mounted communication device, and the loan address A lending information assigning unit that gives the lending time zone for assigning the lending address to the mobile unit mounted communication device, and a lending information giving unit that gives the lending address to the mobile unit mounted communication device, and address request information indicating a time zone for allocating the lending address. An address request information acquisition unit that is acquired from the mobile unit-mounted communication device, and a loan time zone determination unit that determines the loan time zone based on a time zone indicated by the address request information. The lending address is assigned to a lending time zone defined for the lending address to the communication device.

Further, the present invention is an address management device that assigns an address to a mobile unit-mounted communication device mounted on a mobile unit, the loan address storage unit that stores a loan address to be allocated to the mobile unit-mounted communication device, and the loan address And a lending information giving unit that gives the mobile-mounted communication device information indicating a loan time zone in which the loan address is assigned to the mobile-mounted communication device, and the loan provided to the mobile-mounted communication device A lending time in which an address is assigned to a lending time zone defined for the lending address, and the lending information giving unit determines the lending time zone based on a frequency at which the lending address is assigned to the mobile device. A band determining means is provided .

  According to the present invention, it is possible to realize a mobile unit-mounted communication device in which it is difficult to track a movement route over a long period of time. In addition, it is possible to realize an address management device that assigns an address that makes it difficult to track the movement path of a mobile unit-mounted communication device to the mobile unit-mounted communication device.

  FIG. 1 shows a configuration of an in-vehicle communication device 10 according to an embodiment of the present invention. The in-vehicle communication device 10 is mounted on a vehicle. The plurality of in-vehicle communication devices 10 constitute an inter-vehicle communication system. The in-vehicle communication device 10 includes an antenna 12, a reception unit 14, a transmission unit 16, a unique address storage unit 18, a management address storage unit 20, a borrowed address storage unit 22, a self address storage unit 24, an address management unit 26, and packet information processing. A portion 28 is provided. Each component will be described together with the function of the in-vehicle communication device 10 and the processing executed by the in-vehicle communication device 10.

  A unique address is assigned to the in-vehicle communication device 10 as a unique address for communication. The unique address is stored in the unique address storage unit 18.

  The in-vehicle communication device 10 manages a management address as an address to be assigned to another in-vehicle communication device 10. The in-vehicle communication device 10 can manage a plurality of management addresses. The in-vehicle communication device 10 transmits information including the management address to the other in-vehicle communication device 10 so that the management address is used as a self-address for identification in the inter-vehicle communication system.

  Information indicating whether or not the management address is used is registered in a management table stored in the management address storage unit 20. FIG. 2 shows the configuration of the management table. In the management table, an identifier of “lending” or “not used” is associated with the management address. Furthermore, with respect to the management address associated with the “lending” identifier as the usage status information, lending time limit information indicating a time limit for using the management address by another in-vehicle communication device 10 is associated. In the example of FIG. 2, the identifiers “lending” are associated with the management addresses “5R4X” and “AQR2”, and “not used” is associated with the management addresses “L87U”, “H6HD”, and “RDV3”. An identifier is associated. The management addresses “5R4X” and “AQR2” are associated with “15 September 2007, 10:00” and “15 September 2007, 10:23” as lending time limit information, respectively. ing.

  An address lending process in which the in-vehicle communication device 10 transmits the management address to another in-vehicle communication device 10 as a lending address will be described. FIG. 3 shows a flowchart of the address lending process.

  The address lending process is started when address request information transmitted from another in-vehicle communication device 10 that constitutes the inter-vehicle communication system is received. The address request information includes information indicating that an address is requested to be lent, a self-address for identifying the in-vehicle communication device 10 that has transmitted the address request information, and a time limit for assigning the lent address by the other in-vehicle communication device 10. It includes information indicating the determined requested loan deadline.

  The receiving unit 14 receives the address request information via the antenna 12 and outputs it to the address management unit 26. When acquiring the address request information, the address management unit 26 refers to the management table (S101).

  The address management unit 26 changes the “lending” identifier to the “unused” identifier when the lending time limit has passed for the management address associated with the “lending” identifier (S102). .

  The address management unit 26 determines whether or not a management address registered in the management table is associated with a “non-use” identifier as usage state information (S103). If the management address associated with the “unused” identifier is not registered, the address lending process is terminated.

  On the other hand, when the management address associated with the “unused” identifier is registered as the usage status information, one of the management addresses associated with the “unused” identifier is one of them. When there is one management address associated with the identifier “not used”, the management address is selected as a lending address (S104).

  The address management unit 26 determines the loan deadline and generates loan deadline information indicating the loan deadline (S105). The loan deadline can be determined as the same deadline as the requested loan deadline based on information indicating the requested loan deadline included in the received address request information.

  The address management unit 26 associates the “lending” identifier with the loan address information generated in step S105 and registers it in the management table (S106).

  The address management unit 26 generates the address lending information including the address included in the address request information as the destination address, including the lending address and the lending time limit information, and outputs the address lending information to the transmitting unit 16 (S107). The transmission unit 16 transmits the address lending information via the antenna 12.

  According to such processing, when an unused management address is registered in the management table, one of the management addresses is selected as a lending address for the in-vehicle communication device 10 that is the address request source. . Then, a loan expiration date is determined for the selected loan address. By transmitting address lending information including a lending address and lending time limit information, the other in-vehicle communication device 10 that has acquired the address lending information can acquire and use the lending address. In step S106, the loan term information is registered in the management table. Therefore, under the condition that the other in-vehicle communication device 10 that has acquired the address lending information terminates the use of the lending address within the lending date, lending with the other in-vehicle communication device 10 when the lending date has passed. The lending state can be canceled without performing communication for confirming that the time limit has passed.

  Here, a case has been described where address request information including information indicating a requested loan deadline is acquired. The address lending process can also be executed when address request information that does not include information indicating the requested lending time limit is acquired.

  In this case, in step S105, the address management unit 26 has a time required from the current time to the elapse time of the loan deadline to be necessary for the in-vehicle communication device 10 that is the address request source to transmit and receive packet information. The lending time limit is determined so as to be short enough to have a sufficient length and to make it difficult to track the movement path of the in-vehicle communication device 10 that is the address request source.

  Moreover, it is preferable to shorten the time until the lending time limit elapses as the frequency of assigning the management address to the other in-vehicle communication device 10 increases. For example, in the management table, the lending time limit is determined so that the time until the lending time limit elapses as the number of management addresses associated with the “lending” identifier increases. Alternatively, the frequency with which the address request information is received may be measured, and the loan deadline may be determined such that the higher the frequency, the shorter the time until the loan deadline elapses. Furthermore, a device such as a car navigation device that measures the number of other vehicles existing within a predetermined distance from the vehicle on which the in-vehicle communication device 10 is mounted is installed in the in-vehicle communication device 10, and the larger the number of other vehicles measured, You may determine a loan term so that time until a loan term passes may be shortened. By determining the lending period in this way, a large number of management addresses can be allocated within a certain time.

  Further, in addition to determining the lending date in this way, the average value of the time during which the vehicle is driven is investigated based on statistics for general vehicles, and the lending date is determined in advance based on the average value. It is good as well.

  Further, in step S104, when there are a plurality of management addresses associated with an identifier of “not used”, a process of preferentially selecting a management address that has been in a unused state for a long time as a loan address May be executed. In this case, each time the address lending process is executed by associating the management address associated with the “unused” identifier in the management table with the time elapsed since the “unused” identifier was associated. The process of registering the time in the management table is executed. Further, in step S104, when there are a plurality of management addresses associated with the identifier “not used”, a process of preferentially selecting a management address with a small number of times of being lent may be executed. In this case, in the management table, the number of times that the “lending” identifier is associated with each management address is associated, and each time step S104 is executed, the number of times is updated. According to such processing, each management address registered in the management table is equally assigned to the other in-vehicle communication device 10, and the types of addresses used in the inter-vehicle communication system can be increased within a certain time. it can. As a result, the tracking of the in-vehicle communication device 10 can be made more difficult.

  The in-vehicle communication device 10 transmits the management address as a lending address to another in-vehicle communication device 10, while acquiring the lending address transmitted from the other in-vehicle communication device 10 as a borrowed address and is identified in the inter-vehicle communication system. Apply as self-address.

  An address borrowing process in which the in-vehicle communication device 10 acquires a borrowed address will be described. FIG. 4 shows a flowchart of address borrowing processing. The address borrowing process is executed when the borrowed address is not stored in the borrowed address storage unit 22. In addition, it is preferable to execute it every time the above address lending process ends. Moreover, you may perform every time predetermined time passes, or whenever the vehicle carrying the vehicle-mounted communication apparatus 10 drive | works a predetermined distance.

  The address management unit 26 generates address request information including the self address stored in the self address storage unit 24 by a self address acquisition process described later. Further, the address management unit 26 determines a deadline for using the borrowed address as a requested loan deadline, and includes information indicating the requested loan deadline in the address request information.

  In addition, when each vehicle-mounted communication apparatus 10 which comprises a communication system between vehicles can perform an address loan process with respect to the address request information which does not contain the information which shows a request | requirement loan deadline, a request | requirement loan deadline is shown. The information may not be included in the address request information.

  The requested loan deadline has a sufficient length from the current time to the elapsed time of the requested loan deadline that is necessary for the in-vehicle communication device 10 that is the address request source to transmit and receive packet information. In addition, the time is determined to be short enough to make it difficult to trace the movement route of the in-vehicle communication device 10 that is the address request source. For example, the address management is an average value over a plurality of times of driving time of a vehicle equipped with the in-vehicle communication device 10 as an address request source, that is, the time from when the ignition key is turned on until it is turned off. The unit 26 acquires in advance and determines the degree of the average value.

  Further, it is preferable that the requested loan deadline is determined such that the smaller the number of other vehicles around the vehicle on which the in-vehicle communication device 10 is mounted, the longer the time until the requested loan deadline elapses. For example, the frequency at which the address request information transmitted from the other in-vehicle communication device 10 is received is measured, and the lower the frequency, the longer the time until the requested lending period elapses. In addition, a device for measuring the number of other vehicles existing within a predetermined distance from a vehicle on which the in-vehicle communication device 10 is mounted is mounted on the in-vehicle communication device 10, and the required loan deadline elapses as the number of measured other vehicles decreases. You may determine so that time until it may become long. By determining the requested loan deadline in this manner, when the frequency of other vehicles that are mounted with the in-vehicle communication device 10 appears in the vicinity is low, the requested loan deadline is lengthened and the period during which the borrowed address can be used is lengthened. can do.

  The address management unit 26 outputs the generated address request information to the transmission unit 16 (S201). The transmission unit 16 transmits the address request information via the antenna 12.

  The address lending information is transmitted from the other in-vehicle communication device 10 that has received the address request information and responded thereto by the address lending process. The receiving unit 14 receives the address lending information via the antenna 12 and outputs it to the address management unit 26.

  The address management unit 26 acquires a loan address included in the address loan information as a borrowed address (S202). Further, the loan deadline information included in the address loan information is acquired as the use deadline information (S203). The address management unit 26 stores the borrowed address and expiration date information in the borrowed address storage unit 22 (S204). When the expiration date of the borrowed address stored in the borrowed address storage unit 22 has elapsed, the address management unit 26 deletes the borrowed address and its expiration date information from the borrowed address storage unit 22 (S205).

  According to steps S201 to S204, the borrowed address and the expiration date information are acquired from the received address lending information and stored in the borrowed address storage unit 22. Further, according to step S205, it is possible to avoid referencing the borrowed address after the expiration date by the address management unit 26. Note that the borrowed address storage unit 22 can store a plurality of borrowed addresses by executing the address borrowing process a plurality of times.

  A self address setting process in which the address management unit 26 determines a self address and stores it in the self address storage unit 24 will be described. FIG. 5 shows a flowchart of the self address setting process.

  The address management unit 26 refers to the expiration date information stored in the self address storage unit 24 and starts the self address setting process when a predetermined time has passed before the expiration date of the expiration date indicated by the expiration date information. .

  The address management unit 26 determines whether or not the borrowed address is stored in the borrowed address storage unit 22 (S301).

  The address management unit 26 acquires one of the borrowed addresses as a self-address when one borrowed address is stored (S302). When a plurality of borrowed addresses are stored, it is preferable to preferentially select one having a short time until the expiration date. Further, the address management unit 26 acquires the expiration date information stored together with the borrowed address in the borrowed address storage unit 22 (S303). The address management unit 26 stores the self address and expiration date information in the self address storage unit 24 (S304). The address management unit 26 deletes the borrowed address acquired as the self address and its expiration date information from the borrowed address storage unit 22 (S305).

  When the borrowed address is not stored in the borrowed address storage unit 22, the address management unit 26 acquires the unique address stored in the unique address storage unit 18 as a self address (S306).

  And it is memorize | stored in the self-address memory | storage part 24 with the expiration date information which shows the inherent expiration date predetermined as an expiration date when using a unique address as a self address (S307).

  According to such processing, when a borrowed address is stored in the borrowed address storage unit 22, the borrowed address is stored as a self address in the self address storage unit 24, and the borrowed address is stored in the borrowed address storage unit 22. If not, the unique address is stored in the self address storage unit 24 as a self address.

  When a borrowed address is applied as a self address, the expiration date of the self address becomes the expiration date of the borrowed address. The expiration date of the borrowed address is defined by the loan term information included in the address loan information. Therefore, when a borrowed address is applied as a self-address, the time until the expiration date of the self-address has a sufficient length necessary for communication, and the in-vehicle communication device 10 The time is short enough to make it difficult to track the movement path.

  Also, in step S302, when a plurality of borrowed addresses are stored, a borrowed address acquired as a self-address within a certain period of time is selected by preferentially selecting one having a short time until the expiration date. The number can be as large as possible. As a result, the frequency of changing the self-address within a certain time can be increased, and the tracking of the in-vehicle communication device 10 can be made difficult.

  The self address setting process is executed every time a predetermined time before the time when the expiration date for the self address stored in the self address storage unit 24 elapses. And the borrowed address memorize | stored in the borrowed address memory | storage part 22 is changed by performing an address borrowing process. As a result, the self address stored in the self address storage unit 24 is changed with the expiration of the expiration date.

  Next, the process in which the vehicle-mounted communication apparatus 10 transmits / receives packet information is demonstrated. The address management unit 26 acquires the self address stored in the self address storage unit 24 and outputs it to the packet information processing unit 28.

  The packet information processing unit 28 generates packet information including the self address as a transmission source address and including traveling information indicating the position, moving speed, and the like of the vehicle as transmission target data. The transmission target data may include any other information desired to be conveyed to the passenger of the vehicle on which the in-vehicle communication device 10 as the transmission destination is installed, such as text information, image information, moving image information, and audio information. When the packet information is acquired by another specific in-vehicle communication device 10 or relayed and transmitted, the packet information processing unit 28 sets an address for specifying the other in-vehicle communication device 10 separately from the transmission source address. Include in packet information. The packet information processing unit 28 outputs the generated packet information to the transmission unit 16. The transmission unit 16 transmits packet information via the antenna 12.

  The receiving unit 14 receives packet information via the antenna 12 and outputs the packet information to the packet information processing unit 28. The packet information processing unit 28 acquires packet information from the receiving unit 14. Then, the transmission source address is extracted from the packet information, and the in-vehicle communication device 10 that has transmitted the packet information is specified. Further, data to be transmitted is extracted from the packet information, and traveling information of the vehicle on which the in-vehicle communication device 10 that has transmitted the packet information is mounted is acquired. Based on the acquired travel information, the packet information processing unit 28 controls the travel state of the vehicle so that a collision with another vehicle on which the in-vehicle communication device 10 that is the transmission source of the packet information is mounted is avoided. Further, when the transmission target data of the packet information includes text information, image information, moving image information, audio information, etc., these information are reproduced.

  As described above, when a borrowed address is applied as a self-address, the expiration date of the self-address has a sufficient length necessary for communication and the movement of the in-vehicle communication device 10 The time is short enough to make it difficult to trace the route. Further, by updating the borrowed address stored in the borrowed address storage unit 22, the self address stored in the self address storage unit 24 is changed with the expiration of the expiration date.

  As a result, the self-address included in the packet information as the transmission source address can be changed over time, and the traveling route of the vehicle on which the in-vehicle communication device 10 is mounted can be prevented from being tracked for a long period of time. it can.

  Note that the in-vehicle communication device 10 according to the present embodiment executes both the address lending process and the address borrowing process. In addition to such a communication device, the communication device includes the antenna 12, the receiving unit 14, the transmitting unit 16, the management address storage unit 20, and the address management unit 26, and performs only the address lending process, or the antenna 12, the receiving unit. 14, a transmission unit 16, a unique address storage unit 18, a borrowed address storage unit 22, a self address storage unit 24, and an address management unit 26, and a communication device that executes only address borrowing processing can be configured.

  Moreover, in the above, the vehicle-mounted communication apparatus 10 which comprises a vehicle-to-vehicle communication system was demonstrated as embodiment of this invention. The communication apparatus according to the present invention can be applied to a general mobile radio apparatus and a radio communication apparatus mounted on a mobile body such as a ship.

  Note that the correspondence between the invention-specific matters described in the claims and the components of the embodiment will be mentioned. The correspondence described here does not limit the present invention in any way. It goes without saying that various embodiments are possible as long as the present invention is a configuration that belongs to the technical scope of the present invention.

  The borrowed address acquisition unit and the borrowed time zone information acquisition unit correspond to the antenna 12, the reception unit 14, the borrowed address storage unit 22, the address management unit 26, and the like in the in-vehicle communication device 10. The transmission unit corresponds to the antenna 12, the transmission unit 16, the self address storage unit 24, the address management unit 26, the packet information processing unit 28, and the like in the in-vehicle communication device 10.

  The requested borrowing time zone determination unit corresponds to the address management unit 26 and the like in the in-vehicle communication device 10. The address request unit corresponds to the antenna 12, the transmission unit 16, the address management unit 26, and the like.

  The lending address storage unit corresponds to the management address storage unit 20 or the like in the in-vehicle communication device 10. The lending information adding unit corresponds to the antenna 12, the transmission unit 16, the address management unit 26, and the like.

  The address request information acquisition unit and the lending time zone determination unit correspond to the antenna 12, the reception unit 14, the address management unit 26, and the like in the in-vehicle communication device 10.

It is a figure which shows the structure of a vehicle-mounted communication apparatus. It is a figure which shows the structure of a management table. It is a flowchart of an address lending process. It is a flowchart of an address borrowing process. It is a flowchart of a self address setting process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 In-vehicle communication apparatus, 12 Antenna, 14 Reception part, 16 Transmission part, 18 Unique address storage part, 20 Management address storage part, 22 Borrowed address storage part, 24 Self address storage part, 26 Address management part, 28 Packet information processing part .

Claims (3)

A mobile unit-mounted communication device that is mounted on a mobile unit and transmits / receives packet information,
A borrowed address acquisition unit that acquires the loan address as a borrowed address from an address management device that manages the loan address;
A borrowing time zone information acquisition unit for acquiring information indicating a borrowing time zone defined as a time zone in which the borrowed address can be used from the address management device;
A transmitting unit that transmits packet information including the borrowed address and information about the mobile unit in a borrowed time zone defined for the borrowed address;
A requested borrowing time zone determining unit for determining a time zone for borrowing the loan address as the borrowed address;
An address request unit that transmits address request information for requesting that the loan address is assigned to the time period determined by the request borrowing time period determination unit;
With
The borrowed address acquisition unit
Obtaining the loan address as a borrowed address from the address management device responding to the address request information;
The borrowing time zone information acquisition unit,
A mobile-equipped communication device, wherein information indicating the borrowed time zone is acquired from the address management device responding to the address request information . An address management device that assigns an address to a mobile unit-mounted communication device mounted on a mobile unit,
A loan address storage unit for storing a loan address assigned to the mobile unit-mounted communication device;
A lending information giving unit that gives the lending address and information indicating a lending time zone in which the lending address is assigned to the mobile unit-mounted communication device;
Address request information indicating a time zone for allocating the loan address, an address request information acquisition unit for acquiring from the mobile-equipped communication device;
A lending time zone determining unit that determines the lending time zone based on a time zone indicated by the address request information;
With
An address management apparatus that allocates the lending address to a lending time zone defined for the lending address to the mobile unit-mounted communication apparatus. An address management device that assigns an address to a mobile unit-mounted communication device mounted on a mobile unit,
A loan address storage unit for storing a loan address assigned to the mobile unit-mounted communication device;
A lending information giving unit that gives the lending address and information indicating a lending time zone in which the lending address is assigned to the mobile unit-mounted communication device;
With
Assigning the lending address to the lending address zone defined for the lending address to the mobile device;
The lending information grant unit
An address management apparatus comprising: a lending time zone determining unit that determines the lending time zone based on a frequency at which the lending address is allocated to the mobile unit-mounted communication device.

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