JP4561044B2 - Data file transmission method and transmission program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data file transmission method and transmission program for sending a plurality of data files that can be processed by a computer to a computer.
[0002]
[Prior art]
As a method of sending a plurality of data files that can be processed by a computer to the computer, for example, there is a so-called client / server system that centrally manages data. In such a system, a server computer (hereinafter referred to as “server”) that centrally manages data in response to a request from a client computer (hereinafter referred to as “client”) that occurs irregularly sends the corresponding file to the client. In addition, regular files are sent and received between the client and server by batch processing that is executed periodically.
[0003]
While such a client / server system exists, in the recent advanced information society, computers used for various purposes are also installed in land transportation means represented by automobiles. Some computers (hereinafter referred to as “vehicle-mounted computers”) are configured to be capable of short-range wireless communication for data communication with vehicle-mounted computers in other vehicles located in the vicinity. In such a mobile communication system composed mainly of an in-vehicle computer, many techniques for solving technical problems of inter-vehicle communication are disclosed.
[0004]
For example, when using mobile communication with a limited communication range, wireless communication with other mobile units located outside the wireless communication range of the mobile unit is possible by using other mobile units as relay points. The technique to make is disclosed in the following Patent Document 1. Further, Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique for reliably acquiring communication signals from a plurality of moving bodies when the plurality of moving bodies try to send data to one moving body at the same time.
[0005]
[Patent Document 1]
JP-A-10-96636 (2nd to 9th pages, FIGS. 1 to 17)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 11-68652 (pages 2 to 9, FIGS. 1 to 14)
[0006]
[Problems to be solved by the invention]
By the way, in the short-range wireless data communication in the in-vehicle computer, unlike the above-described client / server system, (1) a server that centrally manages various data for the in-vehicle computer corresponding to the client is unnecessary. 2) Road traffic information such as traffic jams due to traffic accidents is valuable information only to users of vehicles near the accident, and the usefulness of the information depends on the region, so such information is managed by the server. It is not necessary to be able to transmit to all in-vehicle computers (clients). (3) Furthermore, geographical information with high regional dependency is in-vehicle type located in the vicinity rather than information transmission through the server. Various characteristics that were not available in conventional client / server systems, such as faster communication between computers (clients) directly. There exist.
[0007]
For this reason, even with the techniques disclosed in Patent Documents 1 and 2, etc., when all the data (information) held by the own mobile body is always transmitted, the data (information) to be transmitted is enormous. Therefore, there arises a problem that the substantial transmission efficiency is deteriorated.
In particular, in a mobile unit that performs short-range wireless communication, what kind of data (information) file is useful for users of other mobile units existing in the vicinity of the mobile unit in advance. It cannot be determined. Therefore, for example, even if a data file is appropriately selected and transmitted by random extraction or the like, it cannot be said that the transmission efficiency is necessarily improved with respect to transmitting a useful data file.
[0008]
In addition, the problem of transmission efficiency from the viewpoint of the usefulness of such data is not limited to the mobile communication system that is mainly composed of in-vehicle computers. In a computing environment, since the opportunity to acquire various information contents such as information other than road traffic information, such as video and music, increases, such a problem is considered to become more apparent.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a data file transmission method and a transmission program capable of effectively transmitting a useful data file to a computer. It is in.
[0010]
[Means for solving the problems and functions and effects of the invention]
  In order to achieve the above object, the data file transmission method according to claim 1 is a data file transmission method for sending a plurality of data files that can be processed by a computer to a computer,It is implemented in a computer program installed on a moving object,Attributes of each data fileAs geographic location information, time information or type informationAn evaluation score providing step for assigning an evaluation score according to the method, and determining a pseudo-random number having a maximum sum of the evaluation scores, evaluating the predetermined sum of the evaluation scores with the pseudo-random number, and the plurality of data files A file selection step for selecting a data file from the above, and a transmission step for sending the selected data file to a computer.When the attribute of the data file is the geographical position information, the evaluation score assigning step determines the evaluation score of the distance to the current position of the mobile object based on the road type attached to the geographical position information. When given according to a normal distribution or Poisson distribution having a maximum value at a predetermined distance set, and the attribute of the data file is the time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are When given according to Poisson distribution or exponential distribution having the maximum value in time, and the attribute of the data file is the type information, the evaluation score of the file type is higher in the image information and music information, and lower in the document information. Grant based on informationThis is a technical feature.
[0011]
  In the invention of claim 1, the attribute of each data file is obtained by the evaluation score assigning step.As geographic location information, time information or type informationIn the file selection step, a pseudo-random number with the maximum total evaluation score is obtained, and a predetermined sum of the evaluation scores is evaluated with a pseudo-random number. A file is selected and the selected data file is sent to the computer by a sending step.In the evaluation score assigning step, when the attribute of the data file is geographical position information, the evaluation score of the distance to the current position of the mobile object is set based on the road type attached to the geographical position information. If the attribute of the data file is time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are maximized at the current time. When the attribute is assigned according to the Poisson distribution or the exponential distribution and the attribute of the data file is the type information, the evaluation score of the file type is given based on the type information so as to be higher in the image information and music information and lower in the document information.ThisWhen the attribute of the data file is geographical position information, the evaluation score of the distance to the current position of the mobile object is a thing close to a predetermined distance based on the road type attached to the geographical position information is high and far away. If the attribute of the data file is time information, the new and old evaluation scores for the current date and time at the current location of the mobile object are higher from the current date and time. If the attribute of the data file is type information so that the old one becomes lower and the attribute of the data file is type information, the evaluation score of the file type is based on the type information so that it is higher for image information and music information and lower for document information So thatA predetermined sum of evaluation scores is evaluated by a pseudo-random number, a data file is selected and transmitted to a computerThat's whyThe higher the value score, the greater the opportunity to be transmitted to the computer, and the lower the evaluation score, the less the opportunity to be transmitted to the computer. Therefore,Based on the time information, type information and geographical location information about the data file,Useful data files can be effectively sent to a computer.In addition, since the evaluation score based on the geographical position information can vary depending on the moving position of the mobile object, an evaluation score corresponding to the moving position that changes from moment to moment can be given. Thereby, the useful data file evaluated based on the moving position of the moving body can be effectively transmitted to the computer.
[0014]
  And claims2The data file transmission method of claim1The computer mounted on the mobile body has a technical feature in that the program is repeatedly executed at predetermined intervals.
[0015]
  Claim2In this invention, the computer mounted on the mobile body repeatedly executes a program in which the data file transmission method is mounted at predetermined intervals. As a result, for example, when performing short-range wireless communication, even if other mobile objects existing in the communicable range differ depending on their entry and exit, the program is repeatedly executed at predetermined intervals, so that new communication is possible. A useful data file can be effectively transmitted to other mobile computers. Further, in a mobile body that performs short-range wireless communication, the communicable range changes from moment to moment due to movement of the mobile body, while the program is repeatedly executed at predetermined intervals, so that new communication is possible. Useful data files can be effectively transmitted to other mobile computers.
[0018]
  In order to achieve the above object, the claims3In this data file transmission program, a computer that transmits a plurality of data files that can be processed by a computer to a computer is used.Computer mounted on a moving objectAttribute of each data fileAs geographic location information, time information or type informationAn evaluation score assigning means for assigning an evaluation score in accordance with the above, obtaining a pseudo random number having a maximum sum of the evaluation scores, evaluating a predetermined sum of the evaluation scores with the pseudo random number, Function as file selection means for selecting a data file from among them, and transmission means for sending the selected data file to a computerThe evaluation score assigning means sets the evaluation score of the distance to the current position of the mobile body based on the road type attached to the geographical position information when the attribute of the data file is the geographical position information. Assigned according to a normal distribution or a Poisson distribution having a maximum value at a predetermined distance, and when the attribute of the data file is the time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are If the attribute of the data file is the type information, the file type evaluation score is higher for image information and music information, and lower for document information. It is a technical feature that it is given based on.
[0019]
  Claim3In this invention, since the computer that transmits a plurality of data files that can be processed by the computer functions as the evaluation score assigning means, the file selecting means, and the transmitting means, the evaluation score assigning means Assigning an evaluation score according to the attribute of the data file, using the file selection means, obtain a pseudo-random number that maximizes the total sum of the evaluation scores, evaluate the predetermined sum of the evaluation scores with a pseudo-random number, A data file is selected from the files, and the selected data file is sent to the computer by the transmission means.Then, when the attribute of the data file is geographical position information, the evaluation score assigning means sets the evaluation score of the distance to the current position of the mobile body based on a road type attached to the geographical position information. If the attribute of the data file is time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are maximized at the current time. When the attribute is assigned according to the Poisson distribution or the exponential distribution and the attribute of the data file is the type information, the evaluation score of the file type is given based on the type information so as to be higher in the image information and music information and lower in the document information.ThisWhen the attribute of the data file is geographical position information, the evaluation score of the distance to the current position of the mobile object is a thing close to a predetermined distance based on the road type attached to the geographical position information is high and far away. If the attribute of the data file is time information, the new and old evaluation scores for the current date and time at the current location of the mobile object are higher from the current date and time. If the attribute of the data file is type information so that the old one becomes lower and the attribute of the data file is type information, the evaluation score of the file type is based on the type information so that it is higher for image information and music information and lower for document information So thatA predetermined sum of evaluation scores is evaluated by a pseudo-random number, a data file is selected and transmitted to a computerThat's whyThe higher the value score, the greater the opportunity to be transmitted to the computer, and the lower the evaluation score, the less the opportunity to be transmitted to the computer. Therefore,Based on the time information, type information and geographical location information about the data file,Useful data files can be effectively sent to a computer.In addition, since the evaluation score based on the geographical position information can vary depending on the moving position of the mobile object, an evaluation score corresponding to the moving position that changes from moment to moment can be given. Thereby, the useful data file evaluated based on the moving position of the moving body can be effectively transmitted to the computer.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which a data file transmission method and transmission program of the present invention are applied to a vehicle-mounted navigation device will be described below with reference to FIGS.
First, the configuration of the navigation device 20 will be described with reference to FIG.
[0021]
As shown in FIG. 1, the navigation device 20 mainly includes a CPU 21, a memory 22, a data storage 23, an input / output interface 24, an input device 25, a display 26, a GPS sensor 31, a vehicle speed sensor 32, a gyro sensor 33, a wireless device. It is composed of the communication device 35 and the like, and is usually called “car navigation” and is of the type mounted on the vehicle 100. The navigation device 20 corresponds to a “computer mounted on a mobile object” described in the claims.
[0022]
The CPU 21 is a central processing unit that controls the navigation device 20, and is connected to a memory 22, a data storage 23, an input / output interface 24, and the like via a system bus. In addition to the system program 22a for controlling the CPU 21, the memory 22 stores various control programs 22b to 22f and the like. The CPU 21 reads these programs from the memory 22 as necessary and executes them sequentially. . The CPU 21 has a built-in clock 21a having a function of outputting current date / time data.
[0023]
The memory 22 is a semiconductor storage device connected to the system bus, and constitutes a main storage space used by the CPU 21. The memory 22 includes a system program 22a, an input program 22b that enables input of information from the input device 25, a route search program 22e that has a navigation function, which is a basic function of the navigation device 20, and data file attributes. An evaluation score giving program 22c for obtaining and assigning an evaluation score accordingly, a file selection program 22d for selecting a data file based on a selection probability corresponding to the evaluation score, and an output having a function of transmitting the data file to another computer A program 22f and the like are written in advance. As will be described later, the data file transmission program includes an input program 22b, an evaluation score assignment program 22c, a file selection program 22d, and an output program 22f.
[0024]
The data storage 23 is a hard disk (HD), a compact disk (CD-R / RW), a magneto-optical disk (MO), a digital versatile disk (DVD), etc. that constitutes an auxiliary storage space used by the CPU 21. Via the CPU 21. The data storage 23 stores a traffic information file 23a, a music information file 23b, an image information file 23c, a document information file 23d, etc. selected as a plurality of data files. These data files are stored in advance in the data storage 23 or received from the computer 50 such as another vehicle 202 or 204 or a data distribution service center (not shown) and stored.
[0025]
The input / output interface 24 is a device that mediates the exchange of data between the input device 25, the display 26, the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, the wireless communication device 35, and the CPU 21 and the like. Connected to the bus.
[0026]
The input device 25 is an input device provided on the operation panel of the navigation device 20, and is connected to the system bus via the input / output interface 24. The input device 25 is used to input information related to a destination or the like that the user desires to search for a route through the input program 22b, or to input setting information regarding a data file transmission process. In general, a configuration in which a predetermined number of push-type switches are arranged is adopted, but a navigation device that recognizes a touch panel type provided on the surface of the display 26 or a user's voice in consideration of simplification of input operation. Some of them are composed of a microphone that converts input information to 20 and a voice recognition device.
[0027]
The display 26 is a display device that can output the recommended guidance route from the departure point to the destination, transmission setting information of the data file, and the like via the output program 22f, and is provided on the operation panel of the navigation device 20. The display 26 is also connected to the system bus via the input / output interface 24, and is constituted by, for example, a liquid crystal display or a CRT display. Some display screens include a touch panel constituting the input device 25.
[0028]
In this embodiment, the input device 25 and the display 26 are provided on the operation panel of the navigation device 20. However, the present invention is not limited to this, and the input device 25 and the navigation device 20 are provided in a separate housing. The display 26 may be configured. Alternatively, the input device 25 and the display 26 may be physically separated from each other.
[0029]
The GPS sensor 31 is for outputting the current position data of the vehicle according to longitude and latitude, and is connected to the system bus via the input / output interface 24.
The GPS sensor 31 includes a GPS receiver that receives signals from a plurality of GPS satellites and measures the absolute position of the user.
[0030]
The vehicle speed sensor 32 and the gyro sensor 33 are for measuring the relative position of the vehicle, and are connected to the system bus via the input / output interface 24. These sensors are used for autonomous navigation, and the relative position measured by these sensors is the absolute position measured by the GPS receiver, such as in a tunnel where the GPS receiver cannot receive radio waves from the satellite. This is used to correct positioning errors.
[0031]
The wireless communication device 35 is a wireless LAN communication device for transmitting / receiving data to / from another vehicle 200 or the like through a wireless communication line, and is connected to the system bus via the input / output interface 24. For example, a wireless LAN communication system using a spread spectrum communication system is used, and for example, a one-to-n (n is a plurality) communication mode by broadcast or multicast with a radius range of 200 m to 1 km is used. . Thus, a useful data file can be effectively “broadcasted” to a plurality of computers by a data file transmission process described later. In addition, the code | symbol ANT shown in FIG. 1 shows the antenna connected to the radio | wireless communication apparatus 35, for example, has employ | adopted the space diversity system.
[0032]
Here, an outline of the input program 22b, the evaluation score assignment program 22c, the file selection program 22d, the route search program 22e, and the output program 22f stored in the memory 22 will be described.
[0033]
The input program 22b includes information on the destination that the user of the navigation device 20 wants to provide route guidance, information on the departure point, etc., various information necessary for using the navigation function, transmission setting information on the data file, etc. Is input to the user via the input device 25 and transferred to another program or process.
[0034]
The evaluation score assigning program 22c has a function of individually obtaining and assigning an evaluation score to a plurality of data files according to the attributes of each data file. Is equivalent to. In the evaluation score giving program 22c, for example, an evaluation score is obtained based on time information, type information, and geographical position information regarding the data file. This makes it possible to manipulate the “probability” of broadcasting a data file using a wireless LAN, so it is highly useful to broadcast without transmitting all of the data files stored in the data storage 23. Things can be selectively extracted from the data storage 23.
[0035]
Specifically, for example, position information added to an image file such as a video shot by an in-vehicle camera, date / time information added to a file as a date / time created for the first time, music data (MP3), video data (MPEG ), Based on file type information such as still image data (JPEG), document data (HTML), etc., each partial point is obtained by a predetermined function or map, and by summing them, the evaluation score of the data file can be obtained. Calculated. A method of obtaining these partial points will be described later with reference to FIG.
[0036]
The file selection program 22d has a function of selecting one data file from a plurality of data files based on the data file selection probability set at a rate corresponding to the evaluation score. This corresponds to the described “evaluation score giving means”. Details of the file selection program 22d will be described later with reference to the flowchart shown in FIG.
[0037]
The route search program 22e has a function of searching for a destination input by the input device 25 based on map information stored in a map information database (not shown), a departure point input by the input device 25, or a GPS sensor 31. The vehicle has a function of searching for a recommended route from the current location of the vehicle to the desired destination detected based on road information recorded in the map information database. The route search is performed by, for example, a shortest route search algorithm by the Dijkstra method.
[0038]
The output program 22f has a function of displaying route guidance information, data file transmission setting information, and the like on the display 26 as lines and characters, and a function of causing the wireless communication device 35 to wirelessly broadcast the data file selected by the file selection program 22d. It is what you have. The output program 22f can correspond to “transmission means” described in the claims.
[0039]
Next, the flow of the data file transmission program processed by the navigation device 20 will be described with reference to FIGS. Each process by the data file transmission program described below is executed by the input program 22b, the evaluation score assigning program 22c, the file selection program 22d, and the output program 22f described above, and is periodically executed from the main routine of the system program 22a. It is repeatedly activated and executed. Here, there is a high possibility that the evaluation score attached to each file does not change for a short time or while the vehicle travels a short distance. Therefore, the evaluation score assigning program 22c is executed every predetermined time, for example, every 5 minutes, or every predetermined distance traveled by the vehicle 100 such as 5 km, and the file selection program 22d and the output program 22f are the previous evaluation score assigning programs. The calculation result of 22c may be used to repeatedly execute at a cycle shorter than the execution cycle of the evaluation score assignment program 22c.
[0040]
As shown in FIG. 2, in the data file transmission program processed by the navigation device 20, after a predetermined initialization process, first, a process of acquiring attribute information of the data file is performed in step S <b> 101. Specifically, for example, based on data file transmission setting information set by the input program 22b (for example, folder information storing a data file to be transmitted), attribute information of the transmittable data file is stored in the data storage. Are sequentially acquired from the memory 23 and stored in the work area of the memory 22. In the present embodiment, for example, the traffic information file 23a, the music information file 23b, the image information file 23c, and the document information file 23d are stored in the data storage 23. Therefore, these attribute information is read out to the work area of the memory 22. (See FIG. 1).
[0041]
In the subsequent step S103, processing for assigning an evaluation score is performed. This process is executed by the evaluation score assigning program 22c and corresponds to an “evaluation score assigning step” described in the claims. In this process, an evaluation score is given for each data file based on the attribute information (time information, type information, geographical location information) of the data file read into the work area of the memory 22 in step S101.
[0042]
That is, the unique attribute information possessed by each data file is grasped from the viewpoint of time such as the date / time when the data file was created / updated, and it is evaluated whether the data file is new or old. Evaluation is performed from the viewpoint of the file type (also referred to as file attribute) such as which data format is applicable, such as video, still image, or document. Further, if the data file is related to geographical position information, the data file is evaluated from the distance relationship between the geographical position and the current position of the navigation device 20.
[0043]
Here, as an example of the geographical position information, for example, with respect to the attribute information of the image information file 23c photographed by an in-vehicle camera or the like, the geographical position information of the photographing point included in the image information file 23c The current position information of the navigation device 20 is compared, and a partial point obtained by the function f (x) as shown in FIG. 3A is calculated based on the positional relationship between the two. The function f (x) shown in FIG. 3 (A) is a position at which the navigation apparatus 20 transmits the image information file 23c from the geographical position (origin) of the data file (≈the position where the latest score is calculated). Is expressed as a partial point (vertical axis) when the distance to x is the horizontal axis, for example, having a normal distribution characteristic centered on the distance d as shown in the figure, or a Poisson distribution The thing etc. which have a characteristic can be illustrated.
[0044]
When defining the maximum value f (d) of the partial point by the function f (x), for example, 50 km on an expressway and 20 km on a general road according to the road type in the position information of the file. Adjustments may be made for distance d. The maximum value f (d) may be set to “1”. However, if the data file having the geographical position information is regarded as important as the attribute of the data file, the maximum value “1” of the partial points is used. .1 "or" 1.2 "may be set. This makes it possible to differentiate from the maximum value of the partial points based on “time information” and “type information” described below. Further, such geographical position information is also stored as the position information of the road that is the target of the traffic information even in the case of the traffic information file 23a.
[0045]
Thus, when the data file corresponds to the image information file 23c or the traffic information file 23a having geographical position information, the partial points are calculated from the distance relationship between the geographical position and the current position of the navigation device 20. Thus, when the navigation device 20 is traveling too far or near the target road of the image and the traffic information, the partial points are given low, and the positional relationship that is most needed When traveling in this area, the partial points are given higher. Note that the function f (x) shown in FIG. 3 (A) is a partial point with respect to the distance x on the basis of a preset map without being sequentially calculated by an arithmetic operation formula in consideration of speeding up of the arithmetic processing. It may be based on a map operation for obtaining x.
[0046]
As an example of the time information, for example, the time information of each data file is compared with the time information at the current position of the navigation device 20 as the date and time when the data file was first created or the date and time when the data file was recently updated. Then, the partial points obtained by the function g (x) as shown in FIG. 3B are calculated based on the positional relationship between them. The time information at the current position is acquired from date / time data by the clock 21a built in the CPU 21. The function g (x) shown in FIG. 3B is based on the date / time (origin) of the data file and the position at which the navigation device 20 tries to transmit the data file (the position where the most recent score is calculated). Is represented by a partial point (vertical axis) with date / time t (horizontal axis) in FIG. 5, for example, having the characteristics shown in FIG. be able to.
[0047]
When defining the maximum value g (0) of a partial point by the function g (x), the maximum value g (0) may be set to “1”, but time information is used as an attribute of the data file. If it is important to have the data file, the maximum value of partial points such as “1.1” or “1.2” may be set. This makes it possible to differentiate from the maximum value of the partial points based on the above-mentioned “geographical position information” and “type information” described below.
[0048]
Thus, by using the time information of the data file, by calculating the partial point from the time relationship between the date and time of creation of the data file and the current date and time of the navigation device 20, the partial point is given low when the data file is old. When new, partial points are given higher. Thereby, the probability that a new data file is transmitted can be increased. It should be noted that the function d (t) shown in FIG. 3 (B) is a partial point with respect to time t based on a preset map without being sequentially calculated by an arithmetic expression in consideration of speeding up of the arithmetic processing. It may be based on a map operation for obtaining g.
[0049]
Furthermore, for the type information, for example, if the data file is in the format of an MP3 (MPeg audio layer3) audio compression file, there is a high possibility that it is music data, so the partial point h (m) is set to “0.5”. Set. Also, if the data file is in the color still image compressed file format by JPEG (Joint Photographic Expert Group), it is highly possible that the data file is still image data, so the partial point h (m) is set to “0.7” and MPEG Since the color video compressed file format by (Motion Picture Expert Group) is highly likely to be video data, the partial point h (m) is set to “0.6”. Furthermore, if the data file is in the HTML (HyperText Markup Language) format, there is a high possibility that it is a document file, so the partial point h (m) is set to “0.4”. As a result, the partial points of the JPEG file can be set to be particularly high, and then the partial points can be set to decrease in the order of the MPEG file, the MP3 file, and the HTML file.
[0050]
In step S103, the unique attribute information possessed by each data file is obtained from the viewpoint of geographical position information, time information, and attribute information, thereby obtaining the sum of the respective partial points (P = f (x ) + G (t) + h (m)), the evaluation score P can be obtained. Accordingly, a data file having attribute information that the user wants to provide to the navigation device 20 of the other vehicle 200 and the user of the computer 50, such as the product concept (important on traffic information and music information), the intention of the terminal owner (sender), etc. The evaluation score can be increased.
[0051]
It should be noted that the calculation of the partial points and the total sum thereof in step S103 is performed at regular intervals when the transmission program of the data file is executed, but the total capacity of the plurality of data files is 100 Gbytes or 1 Tbytes. When stored in the data storage 23 in order, it is considered inefficient to perform such arithmetic processing on all data files. For this reason, the processing flow may be configured so that the maximum number of files to be subjected to the evaluation scoring process in step S103 is determined in advance, and those having a low total score at the present time are excluded from the next arithmetic processing object. good. However, this does not apply to data files whose evaluation scores may increase in the future.
[0052]
In the next step S105, processing for selecting a data file is performed. This process is executed by the file selection program 22d and corresponds to a “file selection step” described in the claims. The process in step S105 is performed by calling the data file selection process shown in FIG. 4, and will be described here with reference to FIG.
[0053]
As shown in FIG. 4, in the called data file selection process, a process of calculating the sum of the evaluation scores given in step S103 in step S201 is performed. That is, the sum of all the evaluation scores P0, P1, P2,... PN assigned to the data files C0, C1, C2,. Calculate as A.
[0054]
In the subsequent step S203, a process of generating a pseudorandom number having the maximum value as the sum A is performed. In step S205, an initialization process (B = 0, j = 0) is performed.
[0055]
In steps S207, S209, and S211, processing for sequentially adding evaluation scores P0, P1, P2,... PN to the calculation variable B until the value of the calculation variable B becomes equal to or greater than the pseudorandom number R (Yes in S211). Done. Thereby, the variable j for calculation can be determined with the probability according to each value of the evaluation scores P0, P1, P2,.
That is, the higher the evaluation score P, the higher the probability of exiting the processing loop formed by steps S207, S209, and S211, and the lower the evaluation score P, the lower the probability of exiting the processing loop.
[0056]
When the processing loop of steps S207 to S211 is exited (Yes in S211), the data file selected from the value of the variable for calculation j is determined in the subsequent step S213, and the data file Cj is selected. When the data file Cj is selected in step S213, the data file selection process ends, and the process returns to the next step S107 of the calling source. From here, it demonstrates with reference to FIG.
[0057]
As shown in FIG. 1, in step S107, processing for transmitting a data file is performed. This process is executed by the output program 22f and corresponds to the “transmission step” described in the claims. That is, since the data file Cj to be transmitted is selected in step S105 (data file selection processing shown in FIG. 4), the data file Cj is selected for the navigation device 20 of the other vehicle 200 and the computers 50 of the vehicles 202 and 204. The data file Cj is transmitted by the wireless communication device 35 via the wireless communication line.
[0058]
The transmission processing in step S107 is not a unicast (one-to-one) wireless communication performed by selecting a specific transmission partner, but a broadcast or multicast type (one-to-n) wireless communication with an unspecified number of transmission partners. Communication. Therefore, the data file Cj to be transmitted is transmitted to all the other vehicles 200 and the like existing within the reach of the transmission radio wave by the wireless communication device 35, so that the data file Cj is broadcast by the wireless LAN. be able to.
[0059]
As a result, the navigation device 20 of each vehicle 100, 200 always transmits (broadcasts) the data file of its own device to nearby vehicles, and always receives data transmitted (broadcast) from other vehicles. can do. In addition, a new data file received by the device itself is added as a data file to be transmitted to the data storage 23 for transmission to other vehicles, so that various information (music data, image data, data related to traffic jams, etc.) can be transmitted. Such information can be effectively utilized by sharing with other users such as other vehicles 200 existing within the reach of the vehicle.
[0060]
Further, when the position of the navigation device 20 moves as the vehicle 100 travels, for example, the evaluation score based on the geographical position information may vary depending on the movement position, so the movement position of the vehicle 100 that changes from moment to moment. An evaluation score according to can be given. Thereby, the useful data file evaluated based on the movement position of the said vehicle 100 can be effectively transmitted to the navigation apparatus 20 of the other vehicle 200 and the computer 50 of the other vehicles 202 and 204.
[0061]
As described above, according to the navigation device 20 according to the present embodiment, the traffic information file 23a, the document information file 23d, the image information file 23c, and the document information file 23d are stored in step S103 (evaluation score assignment program 22c). On the other hand, an evaluation score is individually obtained and assigned according to the attribute of each data file, and a plurality of data scores are selected based on the selection probability of the data file set at a rate corresponding to the evaluation score by step S105 (file selection program 22d). One data file Cj is selected from the data files, and the selected one data file Cj is sent to the other navigation apparatus 20 and the computer 50 in step S107 (output program 22f).
[0062]
Further, according to the data file transmission program (input program 22b, evaluation score assignment program 22c, file selection program 22d, output program 22f) of the navigation device 20 according to the present embodiment, the computer (CPU 21, memory) included in the navigation device 20 22, the data storage 23, the input / output interface 24, the input device 25, the display 26, etc.) are caused to function as evaluation score assigning means, file selecting means, and transmitting means.
[0063]
Accordingly, one data file Cj is selected at a rate (probability) corresponding to the evaluation score and transmitted to the other navigation device 20 or the computer 50. For example, the higher the evaluation score, the navigation of the other vehicle 200 Opportunities transmitted to the computer 20 of the device 20 and other vehicles 202 and 204 are increased, and as the evaluation score is lower, the opportunity transmitted to the other navigation device 20 and the computer 50 is decreased. Therefore, a useful data file can be effectively transmitted to another navigation device 20 or the computer 50.
[0064]
Further, according to the navigation device 20 according to the present embodiment, the data file transmission method is implemented in the data file transmission program of the navigation device 20 mounted on the vehicle 100, and the wireless communication line is established in step S107 (output program 22f). The selected data file Cj is transmitted to the navigation device 20 of the other vehicle 200 and the computer 50 of the other vehicles 202 and 204 via the computer. Thus, for example, in the navigation device 20 of the vehicle 100 that performs short-range wireless communication, what is the data file that is highly useful for the user of the navigation device 20 of the other vehicle 200 and the computer 50 of the other vehicles 202 and 204? The file that should be transmitted to the navigation device 20 of the other vehicle 200 in the vicinity of the vehicle 100 even in a situation where it must be stochastic. Can be selected stochastically and transmitted. Therefore, a useful data file can be effectively transmitted to another navigation device 20 or the computer 50 under such a probabilistic situation.
[0065]
Furthermore, according to the navigation device 20 according to the present embodiment, since the attribute of the data file is any one of time information, type information, and geographical position information regarding the data file, in step S103 (evaluation score assignment program 22c). An evaluation score is obtained and given based on these pieces of information. Thereby, for example, a high evaluation score is given to new information based on time information, a low evaluation score is given to old information, or a high evaluation score is given to image information and music information based on type information, and the document information is low. A high score can be given to the neighboring geographical information based on the geographical position information, and a low evaluation score can be given to the distant geographical information. Therefore, such an evaluation score is assigned to each data file, and the higher the evaluation score is, the higher the probability is, and the lower the evaluation score is, the lower the probability is, so that the data file is transmitted and stored in the data storage 23 of the navigation device 20. Since it is possible to stop transmitting (broadcasting) all the traffic information files 23a and the like that have been transmitted at all times, it is possible to improve the transmission efficiency in view of the usefulness of the data file.
[0066]
In the above-described embodiment, the vehicle-mounted navigation device has been described as an example of a computer. However, the present invention is not limited to this, for example, a workstation type, a desktop type, a laptop type, a notebook The data file transmission method and transmission program of the present invention may be applied to a type or PDA (Personal Digital Assistant) type computer, mobile phone, or PHS computer (or computer program). The same actions and effects as those obtained by the navigation device 20 can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a navigation device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of processing by a data file transmission program implemented in the navigation apparatus according to the embodiment.
FIG. 3 is an explanatory diagram showing an example of a function used for the evaluation score assigning process shown in FIG. 2, and FIG. 3 (A) is an example of a function of a partial point f (x) given with respect to geographical location information; FIG. 3B shows an example of a function of the partial point g (t) given for the time information.
4 is a flowchart showing a flow of data file selection processing shown in FIG. 2; FIG.
[Explanation of symbols]
20 Navigation device (computer mounted on a moving body)
21 CPU (evaluation score assignment means, file selection means, transmission means)
22 memory
22b Input program
22c Evaluation score grant program (Evaluation score grant means)
22d File selection program (file selection means)
22e Route search program
22f Output program (transmission means)
23 Data storage
23a Traffic information file (multiple data files)
23b Music information file (multiple data files)
23c Image information file (multiple data files)
23d Document information file (multiple data files)
25 Input device
26 Display
35 Wireless communication device
50 computers
100 vehicle (moving body)
200, 202, 204 Other vehicles
S103 (evaluation score giving step, evaluation score giving means)
S105 (file selection step, file selection means)
S107 (transmission step, transmission means)

Claims (3)

A data file transmission method for sending a plurality of data files that can be processed by a computer to a computer, which is implemented in a computer program mounted on a mobile unit,
An evaluation score giving step for assigning an evaluation score according to geographical position information, time information or type information as an attribute of each data file;
A file selection step of obtaining a pseudorandom number having a maximum sum of the evaluation scores, evaluating a predetermined sum of the evaluation scores with the pseudorandom number, and selecting a data file from the plurality of data files;
Look including a transmitting step of transmitting the selected data file to the computer,
The evaluation score giving step includes
When the attribute of the data file is the geographical position information, the evaluation score of the distance to the current position of the mobile object is the maximum value at a predetermined distance set based on the road type attached to the geographical position information. According to the normal distribution or Poisson distribution taking
When the attribute of the data file is the time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are given according to the Poisson distribution or the exponential distribution that takes the maximum value at the current time,
When the attribute of the data file is the type information, the data file transmission method is characterized in that an evaluation score of the file type is given based on the type information so as to be higher in image information and music information and lower in document information. . The computer mounted on a mobile body, the method of transmitting data file according to claim 1, wherein the repeatedly executes the program every predetermined period. A computer mounted on a moving body by a computer that transmits a plurality of data files that can be processed by the computer to the computer ,
Evaluation score giving means for giving an evaluation score according to geographical position information, time information or type information as an attribute of each data file,
A file selection means for obtaining a pseudo random number having a maximum sum of the evaluation scores, evaluating a predetermined sum of the evaluation scores with the pseudo random number, and selecting a data file from the plurality of data files;
Functioning as transmission means for sending the selected data file to a computer ;
The evaluation score giving means is:
When the attribute of the data file is the geographical position information, the evaluation score of the distance to the current position of the mobile object is the maximum value at a predetermined distance set based on the road type attached to the geographical position information. According to the normal distribution or Poisson distribution taking
When the attribute of the data file is the time information, the old and new evaluation scores for the current date and time at the current position of the mobile object are given according to the Poisson distribution or the exponential distribution that takes the maximum value at the current time,
When the attribute of the data file is the type information, the evaluation score of the file type is given based on the type information so as to be higher in the image information and music information and lower in the document information. program.

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