JP2015153360A - content delivery system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a content retained by a device installed at a relay point via which a moving body moving between replay points moves, without causing a load to concentrate on a specific server in a content delivery system.SOLUTION: A moving body onboard device 15 mounted in a moving body requests content acquisition by a scheduler 17. The scheduler 17 deduces, on the basis of moving body schedule information, one or more replay points ahead of the position of the moving body at the time the request was received, and transmits content acquisition via a first network 18 to a relay point installed device 16 installed at the deduced relay point. The relay point installed device 16 requests content from a CCN 11 and receives content data. When the moving body reaches the relay point, the relay point installed device 16 transmits the content data to the moving body onboard device 15.

Description

  The present invention relates to a content distribution system and method, and more particularly to a content distribution system and method for distributing content to a user in a mobile body that moves between a plurality of relay points along a route.

  It is considered to provide a service for providing content in a moving body such as a train. For example, the content is stored in a content storage device in the train. In content distribution, a distribution device in a train reads content data from a content storage device and distributes the content data to a user terminal device or the like. However, in this case, only the content stored in advance in the content storage device can be provided to the user, and the desired content cannot be provided to the user.

  As a system capable of solving the above problems, a system described in Patent Document 1 is known. The system described in Patent Literature 1 includes a distribution server device installed in a train, a server system installed in a service center, and a distribution server device installed in a station. For example, the user applies to the distribution server device in the train to view the image content using a terminal device provided in the seat. When the content desired by the user is not stored in the distribution server device in the train, the distribution server device requests distribution of the image content from the server system of the service center.

  The server system of the service center is connected to an image data distribution device of a content provider company via a network, and acquires image content from the image data distribution device. The server system of the service center calculates the next stop station and its stop time from information on the train number and the travel section transmitted from the distribution server device in the train together with the image content distribution request. When the server system of the service center can supply the image content at the next stop station, the image content is transferred to the distribution server device installed at the next stop station via the network.

  When the train arrives at the station, the distribution server device at the station transmits the image content transferred from the server system at the service center to the distribution server device in the train via the millimeter wave transmission means. The transmission of the image content is performed within the train stop time. When receiving the image content, the distribution server device in the train stores the received image content in the content storage unit. Thereafter, the image content is read from the content storage unit, and the content is distributed to users on the train.

Japanese Patent Laid-Open No. 2003-150681

  In general, content distribution is based on a communication model between a client and a server. In Patent Document 1, a server system of a service center functions as a central server and distributes image content to distribution server devices at each station. In this case, if a large number of content requests are concentrated on the server system of the service center, the load on the server system increases and the load on the network also increases, resulting in a problem that smooth service cannot be provided.

  Here, CCN (Content Centric Network) is known as a network capable of distributing content without concentrating the load on a specific server. The CCN is characterized in that a content request can be made by a content name, routing is made by a content name, each node has a dynamic cache function, and content that has passed through the node is cached in the node. When there is a requested content in the cache, the node that has received the content request reads the content from the cache and provides it to the user. If it is not cached, the request from the user is forwarded to a nearby node. The user can receive the content from a nearby node, and the content can be distributed without imposing a load on a specific server and without using many network resources.

  If the distribution server device at the station can acquire content from the CCN instead of the conventional client-server system disclosed in Patent Document 1, it is possible to avoid the load from being concentrated on the server system of the service center. However, communication in the CCN is performed in a simple manner by sending a content request to the network and the network returning the requested content as data. For this reason, although so-called Pull-type communication in which data is returned in response to a request can be performed, Push-type communication in which data is actively sent cannot be performed.

  In view of the above, the present invention allows content to be held in a device installed at a relay point through which a mobile body that moves between relay points along a route without concentrating the load on a specific server. It is an object to provide a distribution system and method.

  In order to achieve the above object, the present invention provides a mobile unit mounting device mounted on a mobile unit that moves between a plurality of relay points, and a relay point installed at at least a part of the plurality of relay points. A content distribution system for distributing content to a user terminal device of a user in a mobile body, wherein the relay point installation device acquires content data and stores the content data in a storage device; A content transfer unit that reads out the content data acquired by the acquisition unit from the storage device and transmits the content data to the mobile unit mounting device, and the mobile unit mounting unit stores the content data transmitted from the relay point installation unit Content storage unit, and content data read from the content storage unit and transmitted to the user terminal device When a content request from a user is received, it is first checked whether it exists in the content storage unit. If it exists, distribution is started as it is, and if it does not exist, the moving schedule of the mobile object A relay point installation device that refers to a schedule information storage unit that stores schedule information related to the mobile station, determines one or more relay points ahead of the position of the mobile object at the time of receiving the request, and is installed at the determined relay point A content acquisition instruction unit that transmits a content acquisition instruction via the first network, and the content acquisition unit receives a content acquisition instruction from the content instruction acquisition unit, A content acquisition request is transmitted to the second network that returns the content data of the received content, Content data requested from the network is acquired, and when the mobile unit reaches a relay point, the content transfer unit transmits the content data acquired by the content acquisition unit to the mobile unit mounting device, and the mobile unit The body-mounted device provides a content distribution system in which content data received by a content transfer unit is stored in the content storage unit and distributed to a user.

  The content distribution system of the present invention may further include a management device, and the management device may include the content acquisition instruction unit. In this case, the management apparatus may receive a content request via the first network.

  Instead of the above, a configuration may be employed in which the mobile body mounting device further includes a portion corresponding to the management device.

  In the present invention, an information centric network or a content centric network can be used as the second network.

  The content acquisition instruction unit may transmit a content acquisition instruction to a plurality of relay point installation devices installed at a plurality of relay points.

  In the above case, it is preferable that the content acquisition instruction unit transmits an instruction to acquire a content portion corresponding to the travel time from each relay point to the next relay point to each of the plurality of relay points.

  The content distribution unit acquires content data from a content server and distributes the content data to the user terminal device until the content data transmitted from the relay point installation device is stored in the content storage unit, and the content storage unit After the content data transmitted from the relay point installation device is stored, the content data may be read from the content storage unit and distributed to the user terminal device.

  The first network may include a mobile system dedicated network.

  The present invention also uses a mobile unit mounting device mounted on a mobile unit that moves between a plurality of relay points, and a relay point installation device installed at least in a part of the plurality of relay points, A content delivery method for delivering content to a user terminal device of a user in a mobile body, wherein the mobile body-mounted device stores schedule information related to the mobile mobile schedule when receiving a content request from a user By referring to the storage unit, one or more relay points ahead of the position of the mobile object at the time of receiving the request are determined, and the relay point installation device installed at the determined relay point is connected via the first network. Transmitting a content acquisition instruction, and the relay point installation device responds to the request according to the instruction with the content of the requested content. Transmitting a content acquisition request to a second network that returns data, receiving content data of the requested content from the second network, and storing the content data in a storage device; and When the relay point is reached, the acquired content data is read from the storage device and transmitted to the mobile unit mounting device, and the mobile unit mounting device transmits the content data transmitted from the relay point installation unit Is stored in the content storage unit, and the mobile unit mounting apparatus reads the content data from the content storage unit and transmits the content data to the user terminal device.

  In the content distribution method of the present invention, the management device may further use the management device to perform the step of transmitting the instruction.

  In the content distribution system and method of the present invention, the relay point installation device installed at the relay point acquires the content, transfers the content from there to the mobile unit mounting device, and distributes the content to the users in the mobile unit. In the present invention, the first network is used to transmit the content acquisition instruction to the relay point installation device. The relay point installation apparatus that has received the instruction acquires content data from the second network. By using two networks in this way, it is possible to cause the relay point installation apparatus to acquire content data to be transferred to the mobile unit mounting apparatus from the second network. In the present invention, by using the second network for content acquisition, it is possible to cause the relay point installation apparatus to hold content data without concentrating the load on a specific server.

1 is a block diagram showing a content distribution system according to an embodiment of the present invention. The block diagram which shows a mobile body mounting apparatus. The block diagram which shows a scheduler. The block diagram which shows a relay point installation apparatus. The block diagram which shows a network relay apparatus. The block diagram which shows the content delivery based on a general client server model. The flowchart which shows the operation | movement procedure of a content delivery system. The sequence diagram which shows the flow of content delivery. It is a figure which shows the division | segmentation of content data.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a content distribution system according to an embodiment of the present invention. The content distribution system 10 includes a network relay device 12, a content server 13, a mobile unit mounting device 15, a relay point installation device 16, and a scheduler 17. The moving body mounting device 15 is mounted on a moving body that moves between a plurality of relay points, for example, a vehicle (vehicle body) such as a train, a bus, and an aircraft. The relay point installation device 16 is installed at at least a part of a plurality of relay points along the path of the moving body. In the following, a railway train is mainly considered as a moving body, and a stop station of the train is considered as a relay point.

  In the content distribution system according to the present embodiment, two networks are used. That is, a first network such as an IP (Internet Protocol) network and a second network that returns content data of the requested content in response to the request are used. In the present embodiment, the CCN 11 including a plurality of network relay devices 12 is used as the second network. The mobile body mounting device 15, the relay point installation device 16, and the scheduler 17 communicate with each other via the first network 18. The relay point installation device 16 requests content from the CCN 11 and acquires content from the CCN 11.

  An outline of the operation of the content distribution system will be described. The mobile body mounting device 15 distributes content to users who are on the train. When the user requests content data that the mobile unit mounting device 15 does not own, the mobile unit mounting device 15 requests the scheduler (management device) 17 to acquire content data via the first network 18. When the scheduler 17 receives a request for content data acquisition, the scheduler 17 determines one or more stop stations that can deliver the content data based on the travel schedule of the train on which the mobile unit mounting device 15 is mounted, and installs it at the determined stop station. The relay point installation device 16 is instructed to acquire content data via the first network 18. The relay point installation device 16 acquires content data from the CCN 11 according to the instruction, and transmits the acquired content data to the mobile unit mounting device 15 when the train reaches the station. The mobile body mounting device 15 distributes the content data received from the relay point installation device 16 to the user.

  FIG. 2 is a block diagram showing the mobile body mounting device 15. The mobile unit mounting apparatus 15 includes a request receiving unit 51, a content distribution unit 52, a content storage unit 53, and an acquisition request unit 54. The request receiving unit 51 receives a content request from the user terminal device 14. The user requests distribution of contents such as movies, music, and electronic books. The type of content is not particularly limited, and the user may request distribution of other content. The user terminal device 14 is a terminal device used by a user who is on a train on which the mobile body mounting device 15 is mounted. For example, a mobile phone or a tablet terminal device is used as the user terminal device 14. The user terminal device 14 may be a device provided in a train.

  The content storage unit 53 stores the content data transmitted from the relay point installation device 16. For communication between the mobile body mounting device 15 and the relay point installation device 16, for example, high-speed short-distance communication means such as millimeter wave communication means can be used. The content storage unit 53 may store content data different from that transmitted from the relay point installation device 16 in advance. The content distribution unit 52 reads the content data from the content storage unit 53 and transmits it to the user terminal device 14. The content distribution unit 52 transmits content data to the user terminal device 14 by, for example, streaming distribution. For communication between the user terminal device 14 and the mobile unit mounting device 15, for example, wireless communication means such as WiFi can be used. The mobile unit mounting device 15 can simultaneously perform communication with the user terminal device 14 and communication with the relay point installation device 16.

  The acquisition request unit 54 transmits a content request to the scheduler 17 via the first network 18 when the content data of the content requested by the user is not stored in the content storage unit 53. The acquisition request unit 54 receives a distribution schedule indicating which part of the content data is received at which station from the scheduler 17 via the first network. The first network 18 includes, for example, a mobile phone network and a coaxial leak cable. The first network 18 may include a mobile system dedicated network. The content distribution unit 52 may acquire the content data from the content server 13 through the first network 18 until the content data is stored in the content storage unit 53, and may start distributing the content to the user.

  FIG. 3 is a block diagram showing the scheduler 17. The scheduler 17 includes a request reception unit 71, a content acquisition instruction unit 72, and a schedule information storage unit 73. The request receiving unit 71 receives a content request transmitted from the mobile unit mounting apparatus 15. In addition to the content identification information, the content request transmitted from the mobile unit mounting device 15 includes train identification information such as the train number on which the user is on and current train location information.

  The schedule information storage unit 73 stores information for managing a train movement schedule. The schedule information storage unit 73 stores information such as a stop station, arrival time, and departure time for each train, for example. The content acquisition instruction unit 72 refers to the schedule information storage unit 73 and determines one or more stop stations that can deliver the content data to the mobile unit mounting device 15. For example, the content acquisition instructing unit 72 determines a stop station ahead of the train position at the time when the content data acquisition request is transmitted as a stop station that can deliver the content data. The content acquisition instruction unit 72 transmits an instruction for content acquisition via the first network 18 to the relay point installation device 16 installed at the determined stop station. The content acquisition instruction unit 72 transmits a content acquisition instruction to, for example, the plurality of relay point installation devices 16. At this time, the content acquisition instruction unit 72 instructs each of the plurality of relay point installation apparatuses to acquire a content portion corresponding to the travel time from each relay point to the next relay point.

  FIG. 4 is a block diagram showing the relay point installation device 16. The relay point installation device 16 includes an instruction receiving unit 61, a content acquisition unit 62, and a content transfer unit 63. The instruction receiving unit 61 receives the content acquisition instruction transmitted from the scheduler 17. When the instruction receiving unit 61 receives a content acquisition instruction, the content acquisition unit 62 transmits a content acquisition request (interest) to the CCN 11. When the content part to be acquired is instructed, the content acquisition unit 62 requests that part of the content from the CCN 11. The content acquisition unit 62 receives content data as a response to the interest, and stores the received content data in a storage device (not shown). When the train reaches the station where the relay point installation device 16 is installed, the content transfer unit 63 reads the content data acquired by the content acquisition unit 62 from the storage device and transmits the content data to the mobile unit mounting device 15.

  FIG. 5 is a block diagram showing the network relay device 12. The network relay device 12 includes a communication unit 21, a request reception unit 22, a content storage unit 23, and a data transmission unit 24. The communication unit 21 communicates with at least one of the content server 13 (see FIG. 1), another network relay device 12, and the relay point installation device 16. The content storage unit 23 stores content data. The content data stored in the content storage unit 23 is identified by the content name.

  The request receiving unit 22 receives the content request transmitted from the relay point installation device 16 through the communication unit 21. When the request reception unit 22 receives the content request, the data transmission unit 24 determines whether the content data of the requested content is stored in the content storage unit 23. When determining that the data is stored, the data transmission unit 24 reads the content data from the content storage unit 23 and transmits the content data to the content request source through the communication unit 21.

  The request transfer unit 25 transfers the request received by the request reception unit 22 to another network relay device 12 when content data of the requested content is not stored in the content storage unit 23. At that time, the request transfer unit 25 refers to a routing table (FIB: Forwarding Information Base) having the content name as an entry, and transfers the request to the network relay device 12 or content server 13 holding the corresponding content data. . The FIB is created by a naming-based routing protocol that advertises the content name covered by each network relay device 12 as a prefix.

  Here, FIG. 6 is a block diagram showing content distribution based on a general client-server model. Consider a case where three routers 201 are connected in series to the content server 200, and each router distributes the same content to five user terminal devices 211, respectively. In this case, every time the user terminal device 211 requests content, access to the content server 200 occurs, and the load on the content server 200 is “15”. At this time, the load on each router 201 is “5”, and the load on the network is “15”, “10”, and “5” in order from the side closer to the content server 200, for a total of “30”.

  On the other hand, when CCN 11 (see FIG. 1) is used for content distribution, the load on the content server 13 is “1”, the service load on the network relay device 12 is “5”, and the server load is 1/15. In CCN 11, since the network portion once the content has passed is not used for the same content distribution, the network load is “1”, “1”, “1” from the side closer to the content server 13, and the total is “3”. . By using CCN 11 for content distribution in this way, server load and network load can be greatly reduced as compared to content distribution based on a normal client / server model.

  In general, when there are N nodes connected in cascade and M users requesting the same content at each node, the server load is N × M and the network load is M × N × (N + 1) / 2 in a normal system. The service load of each node is M. On the other hand, in CCN, the server load is “1”, the network load is N, and the service load of each node is M. Therefore, in content distribution using CCN, the server load can be reduced to 1 / (N × M), and the network load can be reduced to 2 / (M × (N + 1)). Usually, the number of users M is large, and it can be seen that the server load and the network load can be greatly reduced in using CCN.

  FIG. 7 is a flowchart showing an operation procedure of the content distribution system. The user operates the user terminal device 14 to request distribution of content (step A1). The user may select a desired content from the list provided by the mobile unit mounting apparatus 15, or may arbitrarily specify the content. When a content that the mobile device does not have is requested, the mobile device 15 sends a content request to the scheduler 17 via the first network 18 (step A2). The mobile unit mounting device 15 acquires content data from the content server 13 via the first network 18, and starts content distribution to the user (step A3).

  When the scheduler 17 receives the content request from the mobile unit mounting device 15, the scheduler 17 determines a stop station to transmit the content data to the mobile unit mounting device 15 based on the schedule information of the mobile unit (step A4). When content data is transmitted at a plurality of stop stations, it is also determined which part of the content data is to be transmitted from which stop station. The scheduler 17 transmits a content data acquisition instruction to the relay point installation device 16 installed at the determined stop station via the first network 18 (step A5).

  When receiving the content acquisition instruction from the scheduler 17, the relay point installation device 16 transmits a content acquisition request to the CCN 11 that is the second network, and acquires content data as a response to the transmitted request (step A6). When the moving body reaches the station where the mobile device is installed, the relay point installation device 16 transmits the mobile body mounting device 15 to the mobile body mounting device 15 acquired in Step A6 (Step A7). Upon receiving the content data from the relay point installation device 16, the mobile unit mounting device 15 distributes the content data received from the relay point installation device 16 to the user terminal device 14 (step A8).

  FIG. 8 is a sequence diagram showing the flow of content distribution. The user terminal device 14 makes a content request to the mobile unit mounting device 15 mounted on the train on which the user is boarding (step S1). If the mobile body mounting device 15 does not have the requested content, the mobile body mounting device 15 transmits a content request to the scheduler 17 via the first network 18 (step S2). The mobile unit mounting device 15 acquires content data from the content server 13 (see FIG. 1), and starts content distribution to the user (step S4).

  When the scheduler 17 receives the content request from the mobile unit mounting apparatus 15, it determines which part of the content data is to be transmitted to the mobile unit mounting apparatus 15 at which stop station in accordance with the travel schedule of the train (step S3). The scheduler 17 determines, for example, that the content data is transmitted to the mobile unit mounting apparatus 15 at the stop station A, the stop station B, and the stop station C. Further, at each stop station, it is determined which part of the content data is to be transmitted to the mobile unit mounting apparatus 15.

  FIG. 9 is a diagram showing division of content data. The content C is, for example, movie content. When the mobile body mounting device 15 has acquired content data without starting the relay point installation device 16 and has started to distribute the content, the content portion C0 is the user terminal before reaching the first stop A. It has been distributed to the device 14. The scheduler 17 determines that the content portion C1 is transmitted from the relay point installation device 16A of the stop station A to the mobile unit mounting device 15. Further, it is determined that the content portion C2 is transmitted from the relay point installation device 16B of the stop station B to the mobile body mounting device 15 and the content portion C3 is transmitted from the relay point installation device 16C of the stop station C to the mobile body mounting device 15. .

  Returning to FIG. 8, the scheduler 17 instructs the relay point installation device 16A of the stop station A to acquire the content portion C1 (step S5). The scheduler 17 instructs the relay point installation device 16B of the stop station B to acquire the content portion C2 (step S6), and instructs the relay point installation device 16C of the stop station C to acquire the content portion C3 (step S7). ). Steps S5 to S7 may be performed simultaneously, or may be performed separately. For example, the acquisition instruction of the content portion C3 to the relay point installation device 16C of the stop station C may be performed at the time when the train leaves the stop station A or the stop station B, or the time when the train is scheduled to reach the stop station C. You may go a few minutes before.

  When receiving the instruction transmitted from the scheduler 17, the relay point installation device 16 </ b> A of the stop station A transmits an interest requesting the content portion C <b> 1 to the CCN 11. The relay point installation device 16A acquires the content data of the content portion C1 as a response to the interest (step S8). When the train reaches stop station A (step S11), relay point installation device 16A transmits the acquired content data of content portion C1 to mobile unit mounting device 15 (step S12). The mobile unit mounting apparatus 15 stores the content data of the content part C1 in the content storage unit 53 (see FIG. 2). Thereafter, the mobile unit mounting device 15 reads the content data from the content storage unit 53 and continues the content distribution to the user terminal device 14.

  When receiving the instruction transmitted from the scheduler 17, the relay point installation device 16 </ b> B of the stop station B transmits an interest requesting the content portion C <b> 2 to the CCN 11. The relay point installation device 16B acquires the content data of the content part C2 as a response to the interest (step S9). When the train reaches the stop station B (step S13), the relay point installation device 16B transmits the acquired content data of the content portion C2 to the mobile unit mounting device 15 (step S14). The mobile unit mounting apparatus 15 stores the content data of the content portion C2 in the content storage unit 53. The content data of the content portion C1 received at the stop station A may be deleted from the content storage unit 53 if the distribution to the user is completed. The mobile unit mounting device 15 reads the content data from the content storage unit 53 and continues content distribution to the user terminal device 14.

  When the relay point installation device 16C of the stop station C receives the instruction transmitted from the scheduler 17, the relay point installation device 16C transmits an interest requesting the content portion C3 to the CCN 11. The relay point installation device 16C acquires the content data of the content portion C3 as a response to the interest (step S10). When the train reaches the stop station B (step S15), the relay point installation device 16B transmits the acquired content data of the content portion C2 to the mobile unit mounting device 15 (step S16). The mobile unit mounting apparatus 15 stores the content data of the content part C3 in the content storage unit 53. The content data of the content portion C2 received at the stop station B may be deleted from the content storage unit 53 if the distribution to the user is completed. The mobile unit mounting device 15 reads the content data from the content storage unit 53 and continues content distribution to the user terminal device 14.

  In the present embodiment, when the scheduler 17 receives the content request, the scheduler 17 refers to the schedule information storage unit 73 to determine one or more stop stations ahead of the train position at the time of receiving the request, and determines the stop station that has been determined. To inquire about the content acquisition via the first network. The relay point installation device 16 at the stop station acquires content data from the CCN 11 according to the instruction. In this embodiment, the two networks are used separately, the first network is used to instruct acquisition of content data, and the content data itself is acquired from the CCN 11 that is the second network. In this way, content can be held in the relay point installation device 16 installed at the stop station through which the train moving between the stop stations along the route passes without concentrating the load on a specific server. it can

  By using the scheduler 17 and transmitting the content acquisition instruction to the relay point installation device 16 before the train reaches the stop station, the content data can be prepared in advance at the stop station. If high-speed communication means is used for communication between the mobile unit mounting device 15 and the relay point installation unit 16, a large amount of data can be transferred to the mobile unit mounting unit 15 at the stop station. For this reason, for example, when viewing a movie or the like by streaming distribution, the user can view high-quality content after the content data is transferred to the mobile device 15 at the stop station.

  In the above embodiment, the example in which the scheduler 17 that is an independent server includes the content acquisition instruction unit 72 and the schedule information storage unit 73 (see FIG. 2) has been described, but the present invention is not limited to this. For example, the mobile body mounting device 15 may include a content acquisition instruction unit 72 and a schedule information storage unit 73, and transmit a content acquisition instruction from the mobile body mounting device 15 to the relay point installation device 16. The second network may be a network that transmits content data as a response to the request, and is not limited to the CCN 11. An ICN (Information Centric Network) may be used as such a network.

  Although the present invention has been described based on the preferred embodiment, the content distribution system and method of the present invention are not limited to the above embodiment, and various modifications and changes can be made to the configuration of the above embodiment. Those subjected to are also included in the scope of the present invention.

10: Content distribution system 11: CCN
12: Network relay device 13: Content server 14: User terminal device 15: Mobile unit mounting device 16: Relay point installation device 17: Scheduler (management device)
18: First network 21: Communication unit 22: Request reception unit 23: Content storage unit 24: Data transmission unit 25: Request transfer unit 51: Request reception unit 52: Content distribution unit 53: Content storage unit 54: Acquisition request unit 61: Instruction reception unit 62: Content acquisition unit 63: Content transfer unit 71: Request reception unit 72: Content acquisition instruction unit 73: Schedule information storage unit

Claims (11)

A mobile user mounting device mounted on a mobile body that moves between a plurality of relay points, and a relay point installation device that is installed at at least a part of the plurality of relay points, the user of the user in the mobile body A content distribution system for distributing content to a terminal device,
The relay point installation device is
A content acquisition unit that acquires content data and stores it in the storage device;
A content transfer unit that reads content data acquired by the content acquisition unit from the storage device and transmits the content data to the mobile unit mounting device;
The mobile body mounting device is
A content storage unit for storing content data transmitted from the relay point installation device;
A content distribution unit that reads content data from the content storage unit and transmits the content data to a user terminal device;
When the content request is received, the schedule information storage unit that stores schedule information related to the movement schedule of the mobile object is referred to, and one or more relay points ahead of the position of the mobile object at the time of receiving the request are determined, A content acquisition instruction unit that transmits a content acquisition instruction to the relay point installation device installed at the determined relay point via the first network;
When the content acquisition unit receives a content acquisition instruction from the content instruction acquisition unit, the content acquisition unit transmits a content acquisition request to a second network that returns content data of the requested content in response to the request. Get the content data of the requested content from the network of
The content transfer unit transmits content data acquired by the content acquisition unit to the mobile unit mounting device when the mobile unit reaches a relay point, and the mobile unit mounting device receives the content received from the content transfer unit. A content distribution system for storing data in the content storage unit.   The content distribution system according to claim 1, further comprising a management device, wherein the management device includes the content acquisition instruction unit.   The content distribution system according to claim 2, wherein the content acquisition instruction unit receives a content request via the first network.   The content distribution system according to claim 1, wherein the mobile unit mounting apparatus further includes the content acquisition instruction unit.   The content distribution system according to any one of claims 1 to 4, wherein the second network is an information centric network or a content centric network.   The content distribution system according to claim 1, wherein the content acquisition instruction unit transmits a content acquisition instruction to a plurality of relay point installation apparatuses installed at a plurality of relay points.   The content distribution system according to claim 6, wherein the content acquisition instruction unit transmits an instruction to acquire a content portion corresponding to a travel time from each relay point to the next relay point to each of the plurality of relay points. .   The content distribution unit acquires content data from a content server and distributes the content data to the user terminal device until the content data transmitted from the relay point installation device is stored in the content storage unit, and the content storage unit The content distribution system according to any one of claims 1 to 7, wherein after the content data transmitted from the relay point installation device is stored, the content data is read from the content storage unit and distributed to the user terminal device. .   The content distribution system according to any one of claims 1 to 8, wherein the first network includes a mobile system dedicated network. A user of a user in a mobile body using a mobile body mounting device mounted on a mobile body that moves between a plurality of relay points and a relay point installation device installed in at least a part of the plurality of relay points A content distribution method for distributing content to a terminal device,
When the mobile unit mounting apparatus receives a content request from a user, the mobile unit mounting device refers to a schedule information storage unit that stores schedule information related to the mobile unit's movement schedule, and is ahead of the position of the mobile unit at the time of receiving the request. Determining one or more relay points, and transmitting a content acquisition instruction to the relay point installation device installed at the determined relay point via the first network;
In accordance with the instruction, the relay point installation device transmits a content acquisition request to the second network that returns the content data of the requested content in response to the request, and the content data of the content requested from the second network Receiving and storing in the storage device;
The relay point installation device reads the acquired content data from the storage device and transmits it to the mobile unit mounting device when the mobile unit reaches the relay point;
The mobile unit mounting device storing content data transmitted from the relay point installation device in a content storage unit;
A content distribution method comprising: a step of reading content data from the content storage unit and transmitting the content data to a user terminal device.   The content distribution method according to claim 10, further using a management device, wherein the management device performs the step of transmitting the instruction.

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