JP2020067708A - Divided data transfer system and divided data transfer method - Google Patents

Abstract

To provide a divided data transfer system and a divided data transfer method that can transfer data further efficiently without occupying a large storage area of a portable terminal.SOLUTION: The need of transmitting all data, which should be provided from an external server 300A to an in-vehicle device 100A, to a portable terminal 200A at a time and storing the data is eliminated by dividing data into a plurality of pieces and transferring the data from the external server 300A through the portable terminal 200A to the in-vehicle device 100A. Furthermore, data can be efficiently transferred when a plurality of portable terminals 200A share and transfer a plurality of pieces of divided data from the external server 300A to the in-vehicle device 100A compared to transferring the data by one portable terminal 200A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a divided data transfer system and a divided data transfer method, and is particularly suitable for use in a system that divides data into a plurality of pieces and transfers the data from an external server to an in-vehicle device via a mobile terminal.

  As a mechanism for updating data and programs (hereinafter simply referred to as data) stored in the in-vehicle device, a method using a removable storage medium or tethering a mobile terminal with a communication function such as a smartphone is used to externally connect to the in-vehicle device. A method of connecting to a server is known.

  In the method using a removable storage medium, the update data is downloaded from an external server to a personal computer or the like, the update data is stored in the removable storage medium from the personal computer, and the removable storage medium is connected to the onboard unit to update the data. Transfer to in-vehicle device. Therefore, it is necessary to use a personal computer. However, recently, the number of users who do not have a personal computer is increasing, and such a method cannot be used for such users.

  On the other hand, in the method of tethering the mobile terminal, it is possible to directly download the update data from the external server to the vehicle-mounted device via the mobile terminal. However, there is a demerit that the cost of communication with the mobile terminal while downloading the update data becomes a burden on the user. Further, when downloading the update data in a garage at home, there is an inconvenience that the engine of the vehicle must be started during communication. Such a problem becomes more remarkable as the data capacity of the update data to be downloaded becomes larger.

  On the other hand, there is known a system in which update data is transmitted from an external server to a mobile terminal and an in-vehicle device acquires the update data from the mobile terminal at a predetermined timing (for example, refer to Patent Document 1). If the technology described in Patent Document 1 is used, for example, the update data is downloaded from an external server to a mobile terminal using a wireless LAN that does not require communication cost, and then Bluetooth (registered trademark, hereinafter, does not cost communication). It is possible to transfer the update data from the mobile terminal to the vehicle-mounted device by using the same.

  However, the method using the technique described in Patent Document 1 has a problem that a large amount of storage area in the internal storage of the mobile terminal is occupied by the update data. On the other hand, a system is known in which the update data is divided into a predetermined size, and the update data is transmitted from the update device to the gateway device and the update data is transmitted from the gateway device to the electronic control device in division units. (For example, see Patent Document 2).

  When the mobile terminal is used instead of the gateway device by applying the technique described in Patent Document 2, it is not necessary to download and store all of the update data from the external server to the mobile terminal at one time, so that many mobile terminals have It is possible to solve the problem that the storage area is occupied by the update data. However, there is a problem in that one portable terminal needs to download update data in units of divisions from an external server many times and transfer the updated data to an in-vehicle device, which is inefficient.

JP, 2016-60407, A JP, 2017-175208, A

  The present invention has been made to solve such a problem, and in a system for transferring data from an external server to an in-vehicle device via a mobile terminal, it occupies a large storage area of the mobile terminal. It is an object of the present invention to make it possible to transfer data more efficiently without having to do so.

  In order to solve the problems described above, in the present invention, data is divided into a plurality of pieces and transferred from an external server to a vehicle-mounted device via a plurality of mobile terminals. Specifically, the external server transmits the divided data requested from the plurality of mobile terminals to the plurality of mobile terminals, out of the plurality of divided data obtained by dividing the data to be provided to the vehicle-mounted device. Each of the plurality of mobile terminals acquires the divided data requested by the in-vehicle device from the external server and temporarily stores the divided data, and then, when connected to the in-vehicle device, stores the temporarily stored divided data in the in-vehicle device. And the reception request of the unreceived divided data is received from the vehicle-mounted device. The vehicle-mounted device acquires the divided data transmitted from the mobile terminal and stores it in the internal storage, and requests the connected mobile terminal to acquire the unreceived divided data.

  According to the present invention configured as described above, it is not necessary to transmit all of the data to be provided from the external server to the in-vehicle device to the mobile terminal at one time and store the data, so that a large storage area of the mobile terminal Never occupy. Further, since the plurality of mobile terminals share the division data and transfer the divided data from the external server to the vehicle-mounted device, the data transfer can be performed more efficiently than in the case where the one mobile terminal transfers the division data. As described above, according to the present invention, in a system for transferring data from an external server to an in-vehicle device via a mobile terminal, data transfer can be performed more efficiently without occupying a large storage area of the mobile terminal. Can be done.

It is a figure showing an example of whole composition of a division type data transfer system by this embodiment. It is a block diagram showing an example of functional composition of a division type data transfer system by a 1st embodiment. It is a figure which shows the operation example of the division | segmentation type | mold data transfer system by 1st Embodiment. It is a block diagram showing an example of functional composition of a division type data transfer system by a 2nd embodiment. It is a figure which shows the operation example of the division | segmentation type data transfer system by 2nd Embodiment. It is a block diagram showing an example of functional composition of a division type data transfer system by a 3rd embodiment. It is a figure which shows the operation example of the division | segmentation type data transfer system by 3rd Embodiment. It is a figure which shows the operation example of the division | segmentation type data transfer system by 3rd Embodiment. It is a block diagram showing an example of functional composition of a division type data transfer system by a 4th embodiment. It is a figure which shows the operation example of the division | segmentation type | mold data transfer system by 4th Embodiment.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the overall configuration of a divided data transfer system according to this embodiment. As shown in FIG. 1, the split-type data transfer system according to the present embodiment includes an in-vehicle device 100, a plurality of mobile terminals 200 _-X to 200 _-Z, and an external server 300. Data is divided into a plurality of pieces and transferred to the vehicle-mounted device 100 via the terminals 200 _-X to 200 _-Z .

The mobile terminals 200 _-X to 200 _-Z are smartphones, for example, and have a Bluetooth communication function and a wireless LAN communication function. The mobile terminals 200 _-X to 200 _-Z perform Bluetooth wireless communication with the vehicle-mounted device 100 and wireless LAN and Internet (which may include a mobile phone network) network communication with the external server 300. . Communication between the mobile terminals 200 _-X to 200 _-Z and the vehicle-mounted device 100 may be performed by wire connection using a USB (Universal Serial Bus) cable or the like.

An application program necessary for relaying data between the vehicle-mounted device 100 and the external server 300 is installed in each of the mobile terminals 200 _-X to 200 _-Z . The mobile terminals 200 _-X to 200 _-Z in which this application program is installed are user-registered in the external server 300, and necessary information for identifying the mobile terminals 200 _-X to 200 _-Z is stored in advance. Be present. Although three mobile terminals 200 _-X to 200 _-Z are shown here as an example, a plurality of mobile terminals 200 _-X to 200 _-Z may be used. In the following description, the three mobile terminals 200 _-X to 200 _-Z may be simply referred to as the mobile terminal 200 unless otherwise distinguished.

(First embodiment)
The functional configuration of the split data transfer system according to the first embodiment will be described below with reference to the drawings. FIG. 2 is a block diagram showing a functional configuration example of the divisional data transfer system according to the first embodiment. In addition, here, in order to distinguish it from a plurality of embodiments that will be sequentially described below, “A” is added to the end of the numeral of each symbol. Moreover, since the functional configurations of the plurality of mobile terminals 200 _-X to 200 _-Z are the same, only one is shown in FIG. 2 as a representative.

  As shown in FIG. 2, the vehicle-mounted device 100A according to the first embodiment includes an internal storage 101A as a storage medium. The in-vehicle device 100A includes an in-vehicle device side divided data acquisition unit 102A and a divided data request unit 103A as functional configurations. These functional blocks 102A and 103A can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the functional blocks 102A and 103A is actually configured by including a CPU, a RAM, a ROM and the like of a computer, and a program stored in a recording medium such as a RAM, a ROM, a hard disk or a semiconductor memory. Is realized by operating.

  Moreover, the mobile terminal 200A according to the first embodiment includes an internal memory 201A as a storage medium. In addition, the mobile terminal 200A includes a mobile side divided data acquisition unit 202A and a mobile side divided data transmission unit 203A as functional configurations. These functional blocks 202A and 203A are actually configured by including a CPU, a RAM, a ROM and the like of a computer, and the above application programs stored in a recording medium such as a RAM, a ROM, a hard disk or a semiconductor memory operate. Is realized by

  The external server 300A according to the first embodiment also includes a data storage unit 301A as a storage medium. The external server 300A also includes a server-side divided data transmission unit 302A as a functional configuration. The functional block 302A can be configured by any of hardware, DSP, and software. For example, when configured by software, the functional block 302A is actually configured by including a CPU, a RAM, a ROM and the like of a computer, and a program stored in a recording medium such as a RAM, a ROM, a hard disk or a semiconductor memory operates. It is realized by

  The data storage unit 301A of the external server 300 stores a plurality of divided data obtained by dividing the data to be provided to the vehicle-mounted device 100A. The data provided from the external server 300A to the in-vehicle device 100A is, for example, update data of map data, an update program of a program installed in the in-vehicle device 100, or the like. In addition, it may be data (not update data) newly transmitted in response to a request transmitted from the vehicle-mounted device 100 to the external server 300. Any data (including a program; the same applies hereinafter) is intended for data with a large overall data capacity, and in the present embodiment, this data is divided into a plurality of pieces and transmitted in a plurality of pieces.

The server-side divided data transmission unit 302A reads out the divided data requested by the plurality of mobile terminals 200A from the data storage unit 301A and transmits the divided data to the plurality of mobile terminals 200A. That is, when the first mobile terminal 200A _-X requests acquisition of the divided data, the server-side divided data transmission unit 302A reads the requested divided data from the data storage unit 301A and then the first portable terminal 200A. _-Send to _X. Similarly, when the server side divided data transmission unit 302A requests acquisition of the divided data from the second mobile terminal 200A _-Y or the third mobile terminal 200A _-Z , the server side divided data transmission unit 302A stores the requested divided data in the data storage unit. It is read from 301A and transmitted to the second mobile terminal 200A _-Y or the third mobile terminal 200A _-Z . What kind of division data acquisition is requested from each mobile terminal 200A will be described later.

  Note that the server-side divided data transmission unit 302A allocates the divided data to be transmitted first to each of the plurality of mobile terminals 200A in the initial stage where the divided data has not yet been transmitted to any of the plurality of mobile terminals 200A. Is determined in advance, and when the mobile terminal 200A and the external server 300 are connected, the divided data is transmitted according to the previously determined allocation. For example, the server side divided data transmission unit 302A transmits the first three divided data to the three mobile terminals 200A at the initial stage.

  The portable-side divided data acquisition unit 202A of the portable terminal 200A acquires the divided data requested by the vehicle-mounted device 100 from the external server 300A and temporarily stores it in the internal memory 201A. The division data acquisition request from the vehicle-mounted device 100 is received by the portable side division data transmission unit 203A, and information indicating the requested division data (hereinafter referred to as acquisition request information) is temporarily stored in the internal memory 201A. . The mobile-side divided data acquisition unit 202A requests the external server 300A to acquire the divided data according to the acquisition request information temporarily stored in the internal memory 201A, and the divided data acquired from the external server 300A is sent as the response to the internal memory. It is stored in 201A. What kind of division data acquisition is requested from the vehicle-mounted device 100A will be described later.

  Note that the mobile-side divided data acquisition unit 202A acquires the divided data transmitted in accordance with a predetermined allocation in the external server 300 at the initial stage described above. That is, at the initial stage, the acquisition request information is not stored in the internal memory 201A. In this case, the mobile-side divided data acquisition unit 202A requests the external server 300A to acquire the divided data without specifying the divided data, and the divided data acquired from the external server 300A in response to the divided data Data) is stored in the internal memory 201A.

  The portable side divided data transmission unit 203A transmits the divided data temporarily stored in the internal memory 201A to the in-vehicle unit 100A when the portable terminal 200A is connected to the in-vehicle unit 100A, and also receives the unreceived divided data. Is received from the vehicle-mounted device 100A. As described above, upon receiving the division data acquisition request from the vehicle-mounted device 100, the portable-side division data transmission unit 203A stores the acquisition request information indicating the requested division data in the internal memory 201A. What kind of division data acquisition is requested from the vehicle-mounted device 100A will be described later.

  The in-vehicle unit side divided data acquisition unit 102A of the in-vehicle unit 100A acquires the divided data transmitted by the portable side divided data transmission unit 203A and stores it in the internal storage 101A.

  The divided data request unit 103A requests the connected mobile terminal 200A to acquire unreceived divided data. In the first embodiment, it is unknown in the in-vehicle apparatus 100A how many divided data pieces the original data is divided into. That is, the divided data that has already been received and stored in the internal storage 101A can be known and managed, but it is unknown how many divided data will remain. Therefore, the divided data requesting unit 103A simply requests acquisition of “next divided data”. Here, even when n (n ≧ 2) mobile terminals 200A are connected to the vehicle-mounted device 100A, the same “next divided data” is requested to the n mobile terminals 200A. .

FIG. 3 is a diagram showing an operation example of the split type data transfer system according to the first embodiment configured as described above. Here, it is assumed that the original data is divided into five and there are five pieces of divided data, and these divided data are represented by numbers 1 to 5, respectively. That is, the numeral "1" indicates the first divided data, and the numeral "5" indicates the last divided data. The number in parentheses () indicates that the divided data of the number is required. The alphabets _{X to Z} indicate the mobile terminals 200A- _{X to} 200A- _Z , respectively. Further, the in-vehicle device 100A and the mobile terminals 200A _{-X to} 200A _-Z are connected to each other by Bluetooth in the vehicle compartment, and the mobile terminals 200A _{-X to} 200A _-Z and the external server 300A are connected to each other by wireless LAN and the Internet at home. .

First, the server-side divided data transmission unit 302A transmits the first to third divided data 1 to 3 to the three mobile terminals 200A _{-X to} 200A _-Z , respectively, according to the predetermined allocation (step S1). . The mobile-side divided data acquisition unit 202A of each of the mobile terminals 200A _{-X to} 200A _-Z acquires the divided data 1 to 3 and stores the acquired divided data 1 to 3 in the internal memory 201A.

Note that, here, for simplification of the description, the operation diagram is such that the divided data 1 to 3 are transmitted to the three mobile terminals 200A _{-X to} 200A _-Z at the same timing, but in reality, the three mobile terminals are When the 200A _{-X to} 200A _-Z are connected to the external server 300A, the external server 300A transmits the divided data 1 to 3 to the mobile terminals 200A _{-X to} 200A _-Z (this is performed in the following steps). The same).

Next, when the user carrying the first mobile terminal 200A _-X boards the vehicle and the first mobile terminal 200A _-X connects to the vehicle-mounted device 100A, the mobile-side divisional data transmission unit 203A stores in the internal memory 201A. The divided data 1 that is temporarily stored is transmitted to the in-vehicle device 100A, an acquisition request for unreceived divided data is received from the in-vehicle device 100A, and acquisition request information indicating the requested divided data is stored in the internal memory 201A. Yes (step S2).

At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 1 transmitted by the portable side divided data transmission unit 203A and stores it in the internal storage 101A. At this stage, since the vehicle-mounted device 100A receives only the divided data 1, the divided data request unit 103A requests the first mobile terminal 200A _-X to acquire the next divided data 2.

After that, when the user carrying the first portable terminal 200A _-X moves from the vehicle to the home and the first portable terminal 200A _-X connects to the external server 300A, the portable side divided data acquisition unit 202A causes the in-vehicle unit 100A to The divided data 2 (divided data 2 indicated by the acquisition request information stored in the internal memory 201A) requested from the external server 300A is acquired and temporarily stored in the internal memory 201A (step S3). At this time, the external server 300A reads the divided data 2 requested by the first mobile terminal 200A _-X from the data storage unit 301A and transmits it to the first mobile terminal 200A _-X .

Next, the user carrying the user and the third mobile terminal 200A _-Z carrying the first mobile terminal 200A _-X is aboard the vehicle, the first mobile terminal 200A _-X and third mobile terminal 200A _{- When Z} is connected to the in-vehicle device 100A, the mobile-side divided data transmission units 203A of the first mobile terminals 200A _-X and the third mobile terminals 200A _-Z divide the data temporarily stored in their respective internal memories 201A. The data 2 and 3 are transmitted to the vehicle-mounted device 100A, an unreceived division data acquisition request is received from the vehicle-mounted device 100A, and the acquisition request information indicating the requested division data is stored in each internal memory 201A (step S4). ).

At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 2 and 3 transmitted by the portable side divided data transmission unit 203A of the first portable terminal 200A _-X and the third portable terminal 200A _-Z. The internal storage 101A. At this stage, since the in-vehicle device 100A has received the divided data 1 to 3, the divided data request unit 103A acquires the next divided data 4 from the first mobile terminal 200A _-X and the third mobile terminal. Request to 200A- _Z .

After that, the user having the first mobile terminal 200A _-X and the user having the third mobile terminal 200A _-Z move from the vehicle to their homes, and the first mobile terminal 200A _-X and the third mobile terminal 200A _{When -Z} connects to the external server 300A, the mobile-side split data acquisition unit 202A of the first mobile terminal 200A _-X and the third mobile terminal 200A _-Z outputs the split data 4 requested by the vehicle-mounted device 100A to the external server. It is acquired from 300A and temporarily stored in the internal memory 201A (step S5). At this time, the external server 300A reads the divided data 4 requested by the first mobile terminal 200A _-X and the third mobile terminal 200A _-Z from the data storage unit 301A, and then reads the first mobile terminal 200A _-X and the first mobile terminal 200A _-X . 3 to mobile terminals 200A- _Z .

Next, the user carrying the user and the third mobile terminal 200A _-Z carrying the second mobile terminal 200A _-Y is aboard the vehicle, the second portable terminal 200A _-Y and third mobile terminal 200A _{- When Z} connects to the in-vehicle device 100A, the mobile-side divided data transmission unit 203A of the third mobile terminal 200A- _Z transmits the divided data 4 temporarily stored in the internal memory 201A to the in-vehicle device 100A, and An unreceived division data acquisition request is received from the vehicle-mounted device 100A, and acquisition request information indicating the requested division data is stored in the internal memory 201A (step S6). Here, the second mobile terminal 200A _-Y stores the divided data 2 in the internal memory 201A, but since this has already been transmitted to the vehicle-mounted device 100A, at this stage the second mobile terminal 200A _-Y The division data 2 is not transmitted to the vehicle-mounted device 100A.

At this time, the vehicle-mounted device side divided data acquisition unit 102A acquires the divided data 4 transmitted by the portable side divided data transmission unit 203A of the third portable terminal 200A- _Z and stores it in the internal storage 101A. At this stage, since the in-vehicle device 100A has received the divided data 1 to 4, the divided data request unit 103A acquires the next divided data 5 from the second mobile terminal 200A _-Y and the third mobile terminal. Request to 200A- _Z .

After that, the user having the second mobile terminal 200A _-Y and the user having the third mobile terminal 200A _-Z move from the vehicle to their homes, and the second mobile terminal 200A _-Y and the third mobile terminal 200A _{When -Z} connects to the external server 300A, the mobile-side divided data acquisition units 202A of the second mobile terminals 200A _-Y and the third mobile terminals 200A _-Z receive the divided data 5 requested by the vehicle-mounted device 100A from the external server. It is acquired from 300A and temporarily stored in the internal memory 201A (step S7).

Next, when the user carrying the first mobile terminal 200A _-X boards the vehicle and the first mobile terminal 200A _-X is connected to the vehicle-mounted device 100A, the mobile-side split data of the first mobile terminal 200A _-X. The transmission unit 203A does not transmit the divided data 4 temporarily stored in the internal memory 201A because it has already been transmitted to the in-vehicle device 100A, and receives the acquisition request of the unreceived divided data 5 from the in-vehicle device 100A and acquires it. The request information is stored in the internal memory 201A (step S8).

After that, when the user carrying the first mobile terminal 200A _-X moves from the vehicle to the home and the first mobile terminal 200A _-X connects to the external server 300A, the mobile side division of the first mobile terminal 200A _-X is performed. The data acquisition unit 202A acquires the divided data 5 requested by the vehicle-mounted device 100 from the external server 300A and temporarily stores it in the internal memory 201A (step S9).

Next, when the user carrying the first mobile terminal 200A _-X boards the vehicle and the first mobile terminal 200A _-X is connected to the vehicle-mounted device 100A, the mobile-side split data of the first mobile terminal 200A _-X. The transmission unit 203A transmits the divided data 5 temporarily stored in the internal memory 201A to the vehicle-mounted device 100A (step S10). At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 5 transmitted by the portable side divided data transmission unit 203A of the first portable terminal 200A _-X and stores it in the internal storage 101A.

Flag information indicating that this is the last divided data is added to the divided data 5. The divided data request unit 103A recognizes that the divided data 5 is the last by referring to this flag information, and does not send the acquisition request for the next divided data to the first mobile terminal 200A _-X . This completes the data transmission from the external server 300A to the vehicle-mounted device 100A.

When the data transmission is completed, the in-vehicle device 100A notifies the external server 300A via the first mobile terminal 200A _-X , and the external server 300A notifies the mobile terminals 200 _-X to 200 _-Z of the notification. The notification may be forwarded to notify that the data transmission has been completed. The mobile terminals 200 _-X to 200 _-Z that have received this notification do not transmit the divided data stored in the internal memory 201A even if they are subsequently connected to the vehicle-mounted device 100A. Alternatively, the mobile terminals 200 _-X to 200 _-Z that have received this notification may discard the divided data in the internal memory 201A.

  As described in detail above, in the first embodiment, data is divided into a plurality of pieces and transferred from the external server 300A to the vehicle-mounted device 100A via the plurality of mobile terminals 200A. Specifically, the external server 300A transmits the divided data requested by the plurality of mobile terminals 200A to the plurality of mobile terminals 200A among the plurality of pieces of divided data obtained by dividing the data to be provided to the in-vehicle apparatus 100A. Send. Each of the plurality of mobile terminals 200A acquires the divided data requested from the in-vehicle device 100A from the external server 300A and temporarily stores the divided data in the internal memory 201A, and thereafter, when connected to the in-vehicle device 100A, the internal memory 201A. The divided data stored in the in-vehicle device 100A is transmitted to the in-vehicle device 100A, and an unreceived acquisition request of the divided data is received from the in-vehicle device 100A. The in-vehicle device 100A acquires the divided data transmitted from the mobile terminal 200A and stores the divided data in the internal storage 101A, and requests the connected mobile terminal 200A to acquire the unreceived divided data.

  According to the first embodiment configured as described above, it is not necessary to transmit all the data to be provided from the external server 300A to the in-vehicle device 100A at one time to the mobile terminal 200A from the external server 300A and store the data. It does not occupy a large storage area of the terminal 200A. Further, since the plurality of mobile terminals 200A share and transfer the divided data from the external server 300A to the vehicle-mounted device 100A, the data transfer can be performed more efficiently than in the case of transferring with one mobile terminal 200A.

(Second embodiment)
Next, a split-type data transfer system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing an example of the functional configuration of the split type data transfer system according to the second embodiment. It is to be noted that, in FIG. 4, the components denoted by the same reference numerals as those shown in FIG. 2 have the same functions, and therefore, duplicated description will be omitted here.

  As shown in FIG. 4, an in-vehicle device 100B according to the second embodiment includes an internal storage 101B and a divided data requesting unit 103B instead of the internal storage 101A and the divided data requesting unit 103A, and a list information requesting unit 104B and an in-vehicle device. The machine-side list information acquisition unit 105B is further provided. The mobile terminal 200B according to the second embodiment further includes a mobile-side list information acquisition unit 204B and a mobile-side list information transmission unit 205B. The external server 300B according to the second embodiment includes a data storage unit 301B instead of the data storage unit 301A, and further includes a server-side list information transmission unit 303B.

  The data storage unit 301B of the external server 300B stores the list information of the plurality of divided data in addition to the plurality of divided data. The list information includes number information of divided data and order information of each divided data. In the second embodiment, list information is transmitted from the external server 300B to the vehicle-mounted device 100B via the mobile terminal 200B at a predetermined timing, and the divided data request unit 103B of the vehicle-mounted device 100B refers to the list information and does not receive the list information. The mobile terminal 200B is requested to acquire the divided data of.

  The server-side list information transmission unit 303B reads the list information from the data storage unit 301B and transmits the list information in response to a request from any of the plurality of mobile terminals 200B. The mobile-side list information acquisition unit 204B of the mobile terminal 200B acquires the list information requested by the vehicle-mounted device 100B from the external server 300B and temporarily stores the list information in the internal memory 201A. The portable-side list information transmitting unit 205B transmits the list information temporarily stored in the internal memory 201A to the in-vehicle device 100B when the portable terminal 200B is connected to the in-vehicle device 100B.

  The list information requesting unit 104B of the in-vehicle device 100B requests the portable terminal 200B to acquire the list information when the portable terminal 200B is connected to the in-vehicle device 100B. The in-vehicle device side list information acquisition unit 105B acquires the list information transmitted by the mobile side list information transmission unit 205B and stores it in the internal storage 101B.

  As described above, in the second embodiment, when a certain mobile terminal 200B is connected to the vehicle-mounted device 100B, the mobile terminal 200B is requested to acquire list information. After that, when the mobile terminal 200B connects to the external server 300B, a list information acquisition request is transmitted to the external server 300B, and the list information is transmitted to the mobile terminal 200B from the external server 300B and stored in the internal memory 201A. After that, when the mobile terminal 200B is connected to the vehicle-mounted device 100B again, the list information stored in the internal memory 201A is transmitted to the vehicle-mounted device 100B and stored in the internal storage 101B.

  When the list information is stored in the internal storage 101B of the vehicle-mounted device 100B, the list information request unit 104B notifies the external server 300B of the fact via the mobile terminal 200B. Upon receiving this notification, the external server 300B recognizes that the transmission of the list information has been completed, and thereafter transmits the divided data.

  The divided data requesting unit 103B has substantially the same function as the divided data requesting unit 103A described in the first embodiment, but is different in the following points. That is, the divided data request unit 103B according to the second embodiment refers to the list information stored in the internal storage 101B as described above, and obtains unreceived divided data for the connected mobile terminal 200B. Request. In particular, when there are n (n ≧ 2) mobile terminals 200B that are connected, the split data requesting unit 103B selects the split data included in the list information for each of the n mobile terminals 200B. This is different from the first embodiment in that acquisition of different unreceived divided data is requested.

  FIG. 5 is a diagram showing an operation example of the divided data transfer system according to the second embodiment configured as described above. Here again, it is assumed that the original data is divided into five and there are five pieces of divided data, and these divided data are represented by numbers 1 to 5, respectively. Although not shown in FIG. 5, it is assumed that transmission of the list information from the external server 300B to the vehicle-mounted device 100B has been completed before the operation example shown in FIG.

In FIG. 5, the processing of steps S1 to S3 is the same as that of the first embodiment shown in FIG. Next, when the first mobile terminal 200B _-X and the third mobile terminal 200B _-Z are connected to the vehicle-mounted device 100B, the mobile-side division data of the first mobile terminal 200B _-X and the third mobile terminal 200B _-Z. The transmission unit 203A transmits the divided data 2 and 3 temporarily stored in the internal memory 201A to the vehicle-mounted device 100B, and receives an acquisition request for the unreceived divided data 4 and 5 from the vehicle-mounted device 100B. The acquisition request information indicating the requested divided data is stored in each internal memory 201B (step S4).

At this time, the in-vehicle unit side divided data acquisition unit 102A acquires the divided data 2 and 3 transmitted by the portable side divided data transmission unit 203A of the first portable terminal 200B _-X and the third portable terminal 200B _-Z. The internal storage 101B. At this stage, since the in-vehicle device 100B has received the divided data 1 to 3, the divided data request unit 103B refers to the list information stored in the internal storage 101B, and the next divided data 4 and the next The first portable terminal 200B _-X and the third portable terminal 200B _-Z are requested to acquire the divided data 5 of the above. By referring to the list information, the divided data requesting unit 103B knows that the next divided data 4 is not the last one, and therefore can also request the next divided data 5.

After that, when the first mobile terminal 200B _-X and the third mobile terminal 200B _-Z connect to the external server 300B, the mobile-side division data acquisition of the first mobile terminal 200B _-X and the third mobile terminal 200B _-Z is performed. The unit 202A acquires the divided data 4 and 5 requested by the vehicle-mounted device 100B from the external server 300B and temporarily stores them in the internal memory 201A (step S5).

Next, when the second mobile terminal 200B- _Y and the third mobile terminal 200B- _Z are connected to the vehicle-mounted device 100B, the mobile-side split data transmission unit 203A of the third mobile terminal 200B- _Z stores in the internal memory 201A. The temporarily stored divided data 5 is transmitted to the in-vehicle device 100B, an unreceived acquisition request for the divided data is received from the in-vehicle device 100B, and the acquisition request information is stored in the internal memory 201A (step S6). Here, the second mobile terminal 200B _-Y stores the divided data 2 in the internal memory 201A, but since this has already been transmitted to the vehicle-mounted device 100B, at this stage the second mobile terminal 200B _-Y The division data 2 is not transmitted to the vehicle-mounted device 100B.

At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 5 transmitted by the portable side divided data transmission unit 203A of the third portable terminal 200B- _Z and stores it in the internal storage 101B. At this stage, the vehicle-mounted device 100B has received the divided data 1 to 3, 5. The divided data request unit 103B refers to the list information stored in the internal storage 101B and requests the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z to obtain the unreceived divided data 4. . Here, the divided data request unit 103B refers to the list information, can recognize that divided data remaining in unreceived only divided data 4 of the fourth, the second mobile terminal 200B _{- The} same divided data 4 is requested to both _Y and the third mobile terminal 200B- _Z .

After that, when the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z connect to the external server 300B, the mobile side division data acquisition of the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z is performed. The unit 202A acquires the divided data 4 requested by the vehicle-mounted device 100B from the external server 300B and temporarily stores it in the internal memory 201A (step S7).

Next, when the first mobile terminal 200B _-X is connected to the vehicle-mounted device 100B, the mobile-side split data transmission unit 203A of the first mobile terminal 200B _-X causes the split data temporarily stored in the internal memory 201A. 4 is transmitted to the vehicle-mounted device 100B (step S8). At this time, the in-vehicle unit side divided data acquisition unit 102A acquires the divided data 4 transmitted by the portable side divided data transmission unit 203A of the first portable terminal 200B _-X and stores it in the internal storage 101B.

  When the divided data 1 to 5 are stored in the internal storage 101B, the divided data request unit 103B can recognize that the data transmission from the external server 300B to the vehicle-mounted device 100B is completed. When recognizing the completion of the data transmission, the divided data request unit 103B does not transmit the acquisition request for the next divided data to the mobile terminal 200B. This completes the data transmission from the external server 300B to the vehicle-mounted device 100B.

  As described above, in the second embodiment, the list information of the plurality of pieces of divided data is transmitted from the external server 300B to the vehicle-mounted device 100B via the mobile terminal 200B, and the divided-data request unit 103B of the vehicle-mounted device 100B transmits the list information. Is referred to for requesting acquisition of unreceived divided data. In particular, when there are n connected mobile terminals 200B, the divided data requesting unit 103B, for each of the n mobile terminals 200B, a different unreceived division of the divided data included in the list information. I'm trying to request the acquisition of data.

  According to the second embodiment configured in this manner, when the in-vehicle device 100B requests the mobile terminal 200B for the unreceived divided data, the same divided data is redundantly requested to the plurality of mobile terminals 200B. Since it is possible to request a plurality of different pieces of divided data from a plurality of mobile terminals 200B, it is possible to transfer data from the external server 300B to the vehicle-mounted device 100B more efficiently.

  In the second embodiment described above, the example in which the list information is transmitted in advance before the division data transmission is started has been described, but the list information transmission method is not limited to this. For example, the list information may be transmitted together with the divided data that is assigned in advance to the mobile terminal 200B that is first connected to the external server 300B. In this case, the external server 300B may start transmitting other divided data after receiving the notification of completion of transmission of the list information, as in the above embodiment.

  Alternatively, the external server 300B may start transmission of other divided data without waiting for the notification of completion of transmission of list information. However, in this case, the divided data request unit 103B of the vehicle-mounted device 100B operates in the same manner as in the first embodiment until reception of the list information (storage in the internal storage 101B) is completed, and the list information is not received. After completion, it operates as in the second embodiment.

(Third Embodiment)
Next, a split data transfer system according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram showing an example of the functional arrangement of a division-type data transfer system according to the third embodiment. Note that, in FIG. 6, components denoted by the same reference symbols as those shown in FIG. 4 have the same functions, and therefore, redundant description will be omitted here.

  As shown in FIG. 6, an in-vehicle device 100C according to the third embodiment includes a divided data requesting unit 103C instead of the divided data requesting unit 103B, and further includes an in-vehicle device-side connection frequency measuring unit 106C.

The in-vehicle device side connection frequency measuring unit 106C measures the connection frequency for each of the plurality of mobile terminals 200B. That is, the vehicle-mounted device side connecting frequency measuring unit 106C has a counter for measuring the number of connections between the mobile terminal 200B _-X ~200B _-Z, every time you connect with any of the mobile terminal 200B _-X ~200B _-Z Then, by incrementing the counter of the connected mobile terminal 200B, the connection frequency with each of the plurality of mobile terminals 200B _{-X to} 200B _-Z is measured. The connection frequency measured here is not only the connection when transferring the divided data but also the other connections. In addition, although the example in which the number of connections is simply counted has been described here, the number of connections per predetermined unit time may be measured.

  The divided data requesting unit 103C has substantially the same function as the divided data requesting unit 103B described in the second embodiment, but is different in the following points. That is, when the divided data requesting unit 103C according to the third embodiment requests acquisition of different divided data for each of the n mobile terminals 200B, the mobile terminal 200B having a higher connection frequency is included in the list information. Requests acquisition of divided data that is earlier in the sequence information.

  FIG. 7 is a diagram showing an operation example of the divisional data transfer system according to the third embodiment. Here, it is assumed that the original data is divided into six pieces and that there are six pieces of divided data, and these pieces of divided data are represented by numbers 1 to 6, respectively. Although not shown in FIG. 7, it is assumed that transmission of the list information from the external server 300B to the vehicle-mounted device 100C has been completed before the operation example shown in FIG.

In FIG. 7, the processing of steps S1 to S5 is the same as that of the second embodiment shown in FIG. Next, when the second mobile terminal 200B- _Y and the third mobile terminal 200B- _Z are connected to the vehicle-mounted device 100C, the mobile-side divided data transmission unit 203A of the third mobile terminal 200B- _Z stores in the internal memory 201A. The temporarily stored divided data 5 is transmitted to the vehicle-mounted device 100C, an unreceived acquisition request for the divided data is received from the vehicle-mounted device 100C, and the acquisition request information is stored in the internal memory 201A (step S6). Here, the second mobile terminal 200B _-Y stores the divided data 2 in the internal memory 201A, but since this has already been transmitted to the in-vehicle device 100C, at this stage the second mobile terminal 200B _-Y The division data 2 is not transmitted to the vehicle-mounted device 100C.

At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 5 transmitted by the portable side divided data transmission unit 203A of the third portable terminal 200B- _Z and stores it in the internal storage 101B. At this stage, the vehicle-mounted device 100B has received the divided data 1 to 3, 5. The divided data request unit 103B refers to the list information stored in the internal storage 101B, and acquires the unreceived divided data 4 and 6 to the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z . Request.

Here, the divided data requesting unit 103C refers to the connection frequency information measured by the in-vehicle-apparatus-side connection frequency measuring unit 106C, so that the third mobile terminal 200B _-Z having the higher connection frequency The divided data 4 having the earlier order is requested, and the second portable terminal 200B _-Y having the lower connection frequency is requested to obtain the divided data 6 having the later order.

After that, when the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z connect to the external server 300B, the mobile side division data acquisition of the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z is performed. The unit 202A acquires the divided data 6 and 4 requested by the vehicle-mounted device 100C from the external server 300B and temporarily stores them in the internal memory 201A (step S7).

Next, when the first mobile terminal 200B- _X is connected to the vehicle-mounted device 100C, the mobile-side divided data transmission unit 203A transmits the divided data 4 temporarily stored in the internal memory 201A to the vehicle-mounted device 100C. , The unreceived division data 6 acquisition request is received from the vehicle-mounted device 100C, and the acquisition request information is stored in the internal memory 201A (step S8). At this time, the vehicle-mounted divisional data acquisition unit 102A acquires the divisional data 4 transmitted by the mobile-side divisional data transmission unit 203A and stores it in the internal storage 101B.

After that, when the first mobile terminal 200B- _X connects to the external server 300B, the mobile-side divided data acquisition unit 202A acquires the divided data 6 requested by the in-vehicle device 100C from the external server 300B and temporarily stores it in the internal memory 201A. It is stored in memory (step S9).

Next, when the first mobile terminal 200B _-X connects to the vehicle-mounted device 100C, the mobile-side split data transmission unit 203A of the first mobile terminal 200B _-X causes the split data temporarily stored in the internal memory 201A. 6 is transmitted to the vehicle-mounted device 100C (step S10). At this time, the in-vehicle device side divided data acquisition unit 102A acquires the divided data 6 transmitted by the portable side divided data transmission unit 203A of the first portable terminal 200B _-X and stores it in the internal storage 101B.

  When the divided data 1 to 6 are stored in the internal storage 101B, the divided data request unit 103C recognizes that the data transmission from the external server 300B to the in-vehicle device 100C is completed, and carries out the request to acquire the next divided data. The transmission to the terminal 200B is stopped. This completes the data transmission from the external server 300B to the vehicle-mounted device 100C.

  In the third embodiment, when the divided data request unit 103C requests acquisition of different divided data for each of the n mobile terminals 200B, the connection frequency between the n mobile terminals 200B. According to the magnitude of the difference between the divided data, the divided data in the order in which the mobile terminal 200B having the lower connection frequency is separated from the order of the divided data requested to the mobile terminal 200B having the higher connection frequency. May be requested.

  FIG. 8 is a diagram showing an operation example of the divisional data transfer system in this case. Here, it is assumed that the original data is divided into eight or more and there are eight or more divided data. Although not shown in FIG. 8, it is assumed that transmission of the list information from the external server 300B to the vehicle-mounted device 100C has been completed before the operation example shown in FIG.

In FIG. 8, the processing of steps S1 to S3 is the same as that of the second embodiment shown in FIG. In the next step S4, the divided data requesting unit 103C refers to the list information stored in the internal storage 101B and the connection frequency information measured by the in-vehicle device side connection frequency measuring unit 106C to acquire the divided data 4 first. The first mobile terminal 200B _-X is requested, and the third mobile terminal 200B _-Z is requested to acquire the divided data 6 in which the order is skipped by one. This is because the connection frequency of the first mobile terminal 200B _-X is almost twice as high as the connection frequency of the third mobile terminal 200B _-Z , and thus the divided data 4 and 6 are requested at two intervals. Is.

Further, in step S6, the divided data requesting unit 103C refers to the list information stored in the internal storage 101B and the connection frequency information measured by the in-vehicle device side connection frequency measuring unit 106C, and acquires the divided data 8 first. The second mobile terminal 200B- _Y is requested and the third mobile terminal 200B- _Z is requested to acquire the divided data 7.

This, although the connection frequency of the third mobile terminal 200B _-Z is not many as 2 times the connection frequency of the second mobile terminal 200B _-Y, connection frequency of the third mobile terminal 200B _-Z is second Since the connection frequency of the mobile terminal 200B- _Y is higher than that of the mobile terminal 200B- _Y , the third mobile terminal 200B- _Z requests the divided data 7 in the earlier order, and the second mobile terminal 200B- _Y requests the divided data in the later order. 8 was requested. Further, the reason why the unreceived divided data 4 and 5 are not requested to the second mobile terminal 200B _-Y and the third mobile terminal 200B _-Z at this point is that the connection frequency is higher than that of the first mobile terminal. Based on the magnitude of the difference in connection frequency between 200B _-X , the second mobile terminal 200B _-Y, and the third mobile terminal 200B _-Z , the first mobile terminal 200B _-X is divided into the divided data 4 and 5 first. This is because there is a possibility that it can be acquired.

  According to the third embodiment configured as described above, the divided data requesting the mobile terminal 200B having a low connection frequency with the in-vehicle device 100C a small number of times requires the mobile terminal 200B having a high connection frequency with the in-vehicle device 100C. It is possible to avoid duplication of the divided data that is requested many times as much as possible. As a result, it is possible to minimize the waste of requesting the same divided data from a plurality of mobile terminals 200B in duplicate, and to transfer the data from the external server 300B to the vehicle-mounted device 100C more efficiently.

(Fourth Embodiment)
Next, a split-type data transfer system according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a block diagram showing an example of the functional arrangement of a split data transfer system according to the fourth embodiment. It is to be noted that, in FIG. 9, the elements denoted by the same reference numerals as those shown in FIG. 6 have the same functions, and therefore, duplicated description will be omitted here.

  As shown in FIG. 9, an external server 300D according to the fourth embodiment includes a server-side divided data transmitting unit 302D instead of the server-side divided data transmitting unit 302A, and a server-side connection frequency measuring unit 304D and an allocation determining unit. 305D is further provided.

The server-side connection frequency measuring unit 304D measures the connection frequency for each of the plurality of mobile terminals 200B. That is, the server-side connecting frequency measuring unit 304D has a counter for measuring the number of connections between the mobile terminal 200B _-X ~200B _-Z, every time you connect with any of the mobile terminal 200B _-X ~200B _-Z By incrementing the counter of the connected mobile terminal 200B, the frequency of connection with each of the plurality of mobile terminals 200B _{-X to} 200B _-Z is measured. The connection frequency measured here is not only the connection when transferring the divided data but also the other connections. In addition, although the example in which the number of connections is simply counted has been described here, the number of connections per predetermined unit time may be measured.

  The allocation determination unit 305D determines allocation of the divided data to be transmitted to each of the plurality of mobile terminals 200B at an initial stage where the plurality of mobile terminals 200B have not yet requested the divided data. Here, when the allocation determining unit 305D determines the allocation of the divided data, the mobile terminal 200B having a higher connection frequency measured by the server-side connection frequency measuring unit 304D has a higher order of being included in the list information of the data storage unit 301B. Allocate the transmission of divided data that is earlier in the information. Further, the allocation determination unit 304D allocates the transmission of the divided data in the spaced order according to the magnitude of the difference in the connection frequency among the plurality of mobile terminals 200B.

  At the initial stage, the server-side divided data transmission unit 302D transmits the divided data to the plurality of mobile terminals 200B according to the allocation determined by the allocation determination unit 304D, and thereafter, the plurality of mobile terminals 200B respectively request the divided data. The divided data to be transmitted to each of the plurality of mobile terminals 200B.

  FIG. 10 is a diagram showing an operation example of the divisional data transfer system according to the fourth embodiment. Here, as in FIG. 8, it is assumed that the original data is divided into eight or more pieces and there are eight or more pieces of divided data. Although not shown in FIG. 10, it is assumed that transmission of the list information from the external server 300D to the vehicle-mounted device 100C has been completed before the operation example shown in FIG.

In FIG. 10, in step S1, the server side divided data transmission unit 302D transmits the first divided data 1 to the first portable terminal 200B _-X according to the allocation determined by the allocation determination unit 305D, and The divided data 8 for the eye is transmitted to the second mobile terminal 200B _-Y , and the third divided data 3 is transmitted for the third mobile terminal 200B _-Z . This is because the connection frequency with the second mobile terminal 200B _-Y is significantly lower than the connection frequency with the first mobile terminal 200B _-X and the connection frequency with the third mobile terminal 200B _-Z. .

  After step S2, the external server 300D operates in the same manner as in the first to third embodiments. Further, the in-vehicle device 100C and the mobile terminal 200B operate in the same manner as in the third embodiment.

  As described above, in the fourth embodiment, in addition to the process of determining what number of divided data is requested from the external server 300D according to the connection frequency between the vehicle-mounted device 100C and the mobile terminal 200B, the external server According to the connection frequency between 300D and the mobile terminal 200B, a process of determining divided data to be transmitted to the mobile terminal 200B is performed in the initial stage. According to the fourth embodiment configured in this manner, it is possible to reduce the waste of requesting the same divided data from a plurality of mobile terminals 200B in duplicate, as compared with the third embodiment. The data transfer from the external server 300D to the vehicle-mounted device 100C can be performed more efficiently.

  In addition, in the said 1st-4th embodiment, when the portable terminal 200 connected to the external server 300, the example which starts a process from the external server 300 transmitting division data to the portable terminal 200 was demonstrated. However, the present invention is not limited to this. For example, when the mobile terminal 200 is connected to the vehicle-mounted device 100, the process may be started from the vehicle-mounted device 100 requesting the mobile terminal 200 to acquire the divided data.

  Further, in the first to fourth embodiments, the case where the divided data requested from the vehicle-mounted device 100 to the mobile terminal 200 is not easily received from the mobile terminal 200 thereafter is not mentioned. For example, when the divided data requested from the vehicle-mounted device 100 to the mobile terminal 200 is not received from the mobile terminal 200 within a predetermined time after the request, the mobile terminal 200 connected to the vehicle-mounted device 100 at that stage is checked. The acquisition of divided data may be requested again. This increases the possibility that the divided data can be acquired from either the first requesting mobile terminal 200 or the second requesting mobile terminal 200, and it is possible to avoid a situation in which it is difficult to acquire specific divided data. it can.

  In addition, all of the above-described first to fourth embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention is not limitedly interpreted by these. It does not happen. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

100 in-vehicle device 101A, 101B internal storage 102A in-vehicle device side divided data acquisition unit 103A, 103B, 103C divided data request unit 104B list information request unit 105B in-vehicle device side list information acquisition unit 106C in-vehicle device side connection frequency measurement unit 200 mobile terminal 201A Internal memory 202A Mobile side divided data acquisition unit 203A Mobile side divided data transmission unit 204B Mobile side list information acquisition unit 205B Mobile side list information transmission unit 300 External server 301A, 301B Data storage unit 302A, 302D Server side divided data transmission unit 303B Server Side list information transmission unit 304D Server side connection frequency measurement unit 305D Allocation determination unit

Claims (8)

A system that divides data into a plurality of pieces from an external server to an in-vehicle device via a plurality of mobile terminals and transfers the data.
The external server is
A data storage unit that stores a plurality of divided data obtained by dividing the data to be provided to the in-vehicle device into a plurality of pieces,
And a server-side divided data transmission unit that reads out the divided data requested from the plurality of mobile terminals from the data storage unit and transmits the divided data to the plurality of mobile terminals,
Each of the plurality of mobile terminals is
A portable side divided data acquisition unit that acquires the divided data requested from the in-vehicle device from the external server and temporarily stores the divided data,
A portable side divided data transmission unit that transmits the temporarily stored divided data to the in-vehicle device when connected to the in-vehicle device and receives an unreceived division data acquisition request from the in-vehicle device. With and
The in-vehicle device
An in-vehicle device side divided data acquisition unit that acquires the divided data transmitted by the portable side divided data transmission unit and stores it in the internal storage,
A division-type data transfer system, comprising: a division data request unit for requesting acquisition of the above-mentioned unreceived division data to a connected mobile terminal. The data storage section stores list information of the plurality of divided data in addition to the plurality of divided data,
The external server is configured to transmit the list information to the in-vehicle device via the mobile terminal at a predetermined timing,
The split data transfer system according to claim 1, wherein the split data requesting unit refers to the list information and requests the connected mobile terminal to acquire the unreceived split data. .   When the number of mobile terminals being connected is n (n ≧ 2), the divided data request unit receives unreceived divided data included in the list information for each of the n mobile terminals. The division-type data transfer system according to claim 2, wherein acquisition of division data different from each other is requested. The list information includes order information of the plurality of divided data,
The in-vehicle device further includes an in-vehicle device-side connection frequency measuring unit that measures a connection frequency for each of the plurality of mobile terminals,
When the divided data requesting unit requests each of the n mobile terminals to acquire the different divided data, the mobile terminal having a higher connection frequency is earlier in the order information included in the list information. The divided data transfer system according to claim 3, wherein acquisition of divided data is requested.   The divided data requesting unit, when requesting each of the n mobile terminals to acquire the different divided data, according to the magnitude of the difference in the connection frequency between the n mobile terminals. , Characterized in that the mobile terminal with the lower connection frequency is requested to obtain the divided data in an order spaced from the order of the divided data requested with the mobile terminal with the higher connection frequency. The divided data transfer system according to claim 4. The list information includes order information of the plurality of divided data,
The external server, a server-side connection frequency measurement unit that measures the connection frequency for each of the plurality of mobile terminals,
In the initial stage where a request for the divided data has not been made from the plurality of mobile terminals, the allocation determination unit that determines allocation of the division data to be transmitted to each of the plurality of mobile terminals is further provided.
When determining the allocation of the divided data, the allocation determination unit allocates the transmission of the divided data in the order information included in the list information to the mobile terminal having a higher connection frequency,
The server-side divided data transmission unit transmits the divided data to the plurality of mobile terminals according to the allocation determined by the allocation determination unit, and after that, transmits the divided data requested by the plurality of mobile terminals. The divided data transfer system according to claim 2, wherein the divided data transfer system transmits to each of the plurality of mobile terminals.   The allocation determination unit, when determining allocation of transmission of the divided data to each of the plurality of mobile terminals, sets an interval according to the magnitude of the difference in the connection frequency between the plurality of mobile terminals. 7. The split data transfer system according to claim 6, wherein transmission of the split data in order is assigned. A division-type data transfer method for dividing data into a plurality of pieces of data from an external server to a vehicle-mounted device via a plurality of mobile terminals,
The external server is
Of the plurality of divided data obtained by dividing the data to be provided to the in-vehicle device, the assignment of the divided data to be transmitted first to each of the plurality of mobile terminals is determined, and the plurality of divided data is assigned according to the assignment. A step of transmitting the divided data to the mobile terminal,
Each time one or more mobile terminals among the plurality of mobile terminals make a request, the step of transmitting the requested divided data to the one or more mobile terminals,
Each of the plurality of mobile terminals is
Acquiring the divided data assigned by the external server and temporarily storing the divided data;
When connected to the in-vehicle device, a step of transmitting the temporarily stored divided data to the in-vehicle device and receiving an acquisition request for unreceived divided data from the in-vehicle device,
A step of temporarily acquiring and storing the divided data related to the acquisition request received from the vehicle-mounted device from the external server;
When connected to the in-vehicle device, the step of transmitting the temporarily stored divided data to the in-vehicle device, and receiving an unreceived division data acquisition request from the in-vehicle device,
The in-vehicle device
When connected to one or more mobile terminals of the plurality of mobile terminals, acquiring the divided data transmitted from the connected one or more mobile terminals and storing the divided data in an internal storage;
And a step of requesting the mobile terminal being connected to acquire the unreceived divided data.