JP2005020376A - Data distribution system for mobile terminals - Google Patents

Abstract

A large volume of data is efficiently distributed using a plurality of base stations.
A center receives a mobile terminal profile together with a content request message from a mobile terminal. The mobile terminal profile includes the type of the mobile terminal 2 and the planned travel route. The center 10 acquires the communication performance of the mobile terminal 2 from the mobile terminal performance management server 12 based on the terminal type, while the communication environment of the plurality of base stations 4 existing on the path from the base station management server 13 based on the planned movement route. Get information. The center 10 calculates the data size that can be distributed by each base station 4 from the communication performance and communication environment information, divides the content data to be distributed accordingly, and divides the divided data before the mobile terminal 2 arrives at each base station 4. Distribute The mobile terminal 2 receives a large amount of data by sequentially receiving the divided data buffered in each base station.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for distributing data to mobile terminals such as in-vehicle terminals.
[0002]
[Prior art]
In recent years, studies have been made on narrow-area communication services for mobile terminals using narrow-area wireless communication such as DSRC (Dedicated Short Range Communication) and wireless LAN (Local Area Network). Narrow-band wireless communication has the advantages of high communication speed (ten times the transmission rate of mobile phones) and low communication costs, and is suitable for downloading large data files such as video content and programs. Yes.
[0003]
However, the size of the communication area of a base station for narrow area wireless communication is very narrow, with a radius of several meters to several tens of meters. If the vehicle is moving at 50 km / h, it will pass through the communication area in several seconds to tens of seconds. Therefore, a mechanism for reliably delivering data to a mobile terminal that moves at high speed is required. For example, in the mobile information transmission system of Patent Document 1, when the mobile terminal fails to receive information at a certain roadside device, the information is transferred to the mobile terminal by passing the information at the roadside device ahead. A mechanism for reliably transmitting credit information has been proposed.
[0004]
[Patent Document 1]
JP 2002-216191 A
[0005]
[Problems to be solved by the invention]
Although the mechanism of the above patent document is an effective method for distributing relatively small data such as credit information, it cannot cope well with large-volume data that cannot be distributed within one communication area. . In such a case, a mechanism capable of efficiently and reliably performing data distribution processing in cooperation with a plurality of base stations is required.
[0006]
However, even between mobile terminals that adopt the same wireless communication method, the actual communication capability varies depending on the manufacturer and type of the communication IF, the specifications of the terminal itself, etc. The communication environment such as the size, the corresponding communication speed, and the legal speed of the installed road are different. Therefore, conventionally, it has not been possible to estimate how much data can be distributed within one communication area, and it has been difficult to efficiently schedule distribution processing on the data distribution side.
[0007]
Conventionally, each time a mobile terminal moves between communication areas, the mobile terminal sends a data distribution request to the data distribution system several times. On the other hand, the data distribution system also repeats the same until the data distribution is successful. Had to deliver data. As a result, redundant and unnecessary communication frequently occurs, which causes problems such as an increase in processing load and an increase in network traffic.
[0008]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a data distribution system capable of efficiently distributing a large amount of data using a plurality of base stations. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the data distribution system of the present invention executes data distribution processing by the following means or procedures. The following means or procedures relating to the data distribution processing are specifically realized by software being read into a computer and executed.
[0010]
In the data distribution system, the mobile terminal performance management means associates and manages the mobile terminal type and communication performance. Also, in the data distribution system, the base station management means associates and manages the location information of the base station that performs wireless communication with the mobile terminal and the communication environment information.
[0011]
Here, the communication performance of the mobile terminal includes information such as the communication speed, and the communication environment information of the base station is information related to the size of the communication area of the base station (for example, the size of the communication area, the mobile terminal passes) If you have stayed, etc.).
[0012]
The data distribution system receives a data distribution request from the mobile terminal by the distribution request receiving means. At this time, the mobile terminal type and the planned movement path of the mobile terminal are received together with the data distribution request.
[0013]
Then, the data distribution system acquires the communication performance of the mobile terminal from the mobile terminal performance management unit based on the received mobile terminal type by the communication performance acquisition unit. In addition, the data distribution system acquires communication environment information of a plurality of base stations existing on the planned movement route from the base station management unit based on the received planned movement route of the mobile terminal by the communication environment acquisition unit. .
[0014]
In this way, by acquiring information on mobile terminals and base stations related to data distribution processing, it is possible to schedule how much data should be distributed in which base station (communication area).
[0015]
Therefore, the data distribution system calculates the data size that can be distributed by each base station based on the communication performance of the mobile terminal and the communication environment information of the base station by the calculating means. This can be calculated if the communication speed of the mobile terminal and the communication time that the mobile terminal can enjoy within the communication area of the base station are known.
[0016]
Subsequently, the data distribution system divides the distribution requested data by the dividing unit based on the calculated data size. The dividing means distributes the divided data to each base station before the mobile terminal arrives at each base station.
[0017]
Thus, according to the present invention, the data size that can be distributed by each base station is obtained based on the actual communication performance of the mobile terminal and the communication environment of each base station, and the distribution data is preliminarily assigned to each base according to the data size. By distributing to stations, the risk of failure of data distribution processing is minimized, redundant useless communication is reduced, and large volumes of data are distributed efficiently using multiple base stations. Is possible.
[0018]
In the present invention, various modes of processing of distributing divided data from each base station to mobile terminals are conceivable.
[0019]
For example, when the data distribution system receives a data distribution start request from a mobile terminal that has arrived at a base station, a mode may further be provided in which the base station starts distribution of data to the mobile terminal. In this aspect, the mobile terminal can receive the distribution of the divided data buffered in the base station immediately by simply transmitting a data distribution start request to the data distribution system. In other words, on the mobile terminal side, there is no need to be aware of what kind of distribution processing is being performed on the data distribution side, and it is only necessary to send a request to the data distribution system as in the past. Processing is simplified.
[0020]
Alternatively, when the data distribution system receives a data distribution request, it generates an identifier related to the data distribution process, and notifies the base station by notifying the identifier to the mobile terminal and the base station that distributed the divided data. It is also preferable that the mobile terminal that has arrived further includes an identifier assigning unit that allows the divided mobile station to receive the divided data from the base station by transmitting the identifier to the base station. In this aspect, the mobile terminal can receive the distribution of the divided data immediately from each base station using the identifier given from the data distribution system. That is, since communication between the base station and the data distribution system is not required when starting actual data distribution, it is possible to reduce the processing load on the data distribution side and the network traffic.
[0021]
The distribution means of the data distribution system, for the base station through which the mobile terminal passes after the second, data including at least part of the data distributed to the base station that passes before the base station. It is also preferred to dispense. Even if data of the expected size cannot be distributed due to a malfunction in the communication state between the base station and the mobile terminal, it is possible to recover at the next and subsequent base stations.
[0022]
This recovery can be performed, for example, by receiving information regarding the size of distribution completed from the base station that performed data distribution and notifying the next base station of the data distribution start point based on the information.
[0023]
The present invention can be understood as a data distribution system for mobile terminals having at least a part of the above means. The present invention can also be understood as a data distribution method for mobile terminals including at least a part of the above procedure, or a program for realizing such a method. Each of the above means and processes can be combined with each other as much as possible to constitute the present invention.
[0024]
For example, a data distribution system for a mobile terminal as one aspect of the present invention includes a mobile terminal performance management unit that manages a mobile terminal model and communication performance in association with each other, and a base station that performs radio communication with the mobile terminal. Base station management means for managing location information and communication environment information in association with each other, and a delivery request receiving means for receiving a mobile terminal type and a planned movement route of the mobile terminal together with a data delivery request from the mobile terminal Based on the received mobile terminal type, communication performance acquisition means for acquiring the communication performance of the mobile terminal from the mobile terminal performance management means, and base station management based on the received scheduled movement path of the mobile terminal Communication environment acquisition means for acquiring communication environment information of a plurality of base stations existing on the planned movement route from the means, and each base station based on the communication performance of the mobile terminal and the communication environment information of the base station A calculation means for calculating a distributable data size; a dividing means for dividing the requested data based on the calculated data size; and the divided data before the mobile terminal arrives at each base station. Distribution means for distributing to each base station.
[0025]
In the data distribution method for mobile terminals as one aspect of the present invention, the computer system manages the mobile terminal model and communication performance in association with each other, and communicates the location information and communication of the base station that performs radio communication with the mobile terminal. The environment information is managed in association with each other, and the mobile terminal type and the planned movement route of the mobile terminal are received from the mobile terminal together with the data distribution request. Based on the received mobile terminal type, the mobile terminal performance is received. The communication performance of the mobile terminal is acquired from the management means, and the communication environment information of a plurality of base stations existing on the planned movement path is acquired from the base station management means based on the received planned movement path of the mobile terminal. Based on the communication performance of the mobile terminal and the communication environment information of the base station, the data size that can be distributed by each base station is calculated, and the distribution requested data is divided based on the calculated data size. And, before the mobile terminal arrives at the base station, it is preferable to distribute the divided data to each base station.
[0026]
Further, in the data distribution program for mobile terminals as one aspect of the present invention, the computer system associates and manages the type of mobile terminal and communication performance, and the position information of the base station that performs radio communication with the mobile terminal And a process of managing communication environment information in association with each other, a process of receiving a mobile terminal type and a planned movement route of the mobile terminal together with a data distribution request from the mobile terminal, and a type of the received mobile terminal Based on the process of acquiring the communication performance of the mobile terminal from the mobile terminal performance management means, and based on the received planned movement path of the mobile terminal, a plurality of bases existing on the planned movement path from the base station management means A process of obtaining communication environment information of a station, a process of calculating a data size that can be distributed by each base station based on the communication performance of the mobile terminal and the communication environment information of the base station, and a calculation Processing to divide the data requested to be distributed based on the received data size and to distribute the divided data to each base station before the mobile terminal arrives at each base station. preferable.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings.
[0028]
(First embodiment)
FIG. 1 is a diagram showing a configuration of a data distribution system according to an embodiment of the present invention.
[0029]
The data distribution system 1 is a system that distributes data such as contents and programs to the mobile terminal 2.
[0030]
The data distribution system 1 includes a center 10, a content DB (database) 11, a mobile terminal performance management server 12, and a base station management server 13. Each of these functions is executed by reading a program stored in the hard disk into the CPU in a general-purpose computer system including a CPU (Central Processing Unit), a memory, a hard disk, and a communication IF (interface) as basic hardware. It is realized by doing. The center 10, the content DB 11, the mobile terminal performance management server 12, and the base station management server 13 can be configured by a single computer, or can be configured by a plurality of computers connected by a network. The data distribution system 1 is connected to the Internet 3 that is a wide area network, and transmits and receives data to and from the mobile terminal 2 via the Internet 3.
[0031]
The center 10 has a function of distributing content data stored in the content DB 11 to the mobile terminal 2 in response to a data distribution request from the mobile terminal 2. The content DB 11 is content storage means in which various content data to be distributed to the mobile terminal 2 such as HTML (Hyper Text Markup Language) data, image data, moving image data, music data, and application programs are stored.
[0032]
The mobile terminal performance management server 12 is mobile terminal performance management means that manages information related to the performance of the mobile terminal, for example, the type of the mobile terminal and its communication performance in association with each other. Even with terminals that use the same wireless communication system, actual communication performance is affected by differences in hardware or software specifications such as the manufacturer and type of communication IF, IC chip type and lot, and communication control program version. There is a big difference. By making an inquiry to the mobile terminal performance management server 12, the actual communication performance corresponding to the type of the mobile terminal 2 can be acquired.
[0033]
The base station management server 13 is a base station management unit that manages information related to the base station 4 for wireless communication, for example, position information of the base station and communication environment information in association with each other. The base stations 4 provide narrow area communication services to the mobile terminals 2 installed on the vehicles 20 traveling on the road, and are installed on the roads such as major intersections. . The base station management server 13 manages the latitude, route, altitude, address, and the like as the position information of the base station 4, and information about the size of the communication area of the base station 4 as the communication environment information (specifically, the mobile terminal 2) Manage the average stay time when passing through the communication area at an average speed. As the communication environment information, information such as a network address, a corresponding communication protocol, a band, and the like may be managed in addition to information regarding the size of the communication area.
[0034]
The mobile terminal 2 of the present embodiment is an in-vehicle terminal installed in a vehicle 20 that is a moving body. The mobile terminal 2 is a computer including a CPU, a memory, a hard disk, a communication IF, a display, and the like as basic hardware. The mobile terminal 2 may be provided in the vehicle 20 or may be a laptop computer temporarily brought into the vehicle 20. It may be.
[0035]
The mobile terminal 2 includes a communication IF for narrow area wireless communication such as DSRC or wireless LAN as a communication IF. When the mobile terminal 2 is within the communication area of the base station 4, the mobile terminal 2 can connect to the Internet 3 using narrow-area wireless communication and can perform data communication with the data distribution system 1 via the Internet 3.
[0036]
In addition, the mobile terminal 2 may be provided with a communication IF using a mobile phone as necessary. Since DSRC and wireless LAN are high-speed (ten times transmission rate compared to mobile phones) and low cost, they are suitable for large-capacity data distribution, but have the disadvantage that the communication area is as narrow as several meters to several tens of meters. There is. In that respect, the mobile phone has an advantage that the available area is wide. Therefore, it is preferable that the mobile terminal 2 uses narrow area wireless communication when in the communication area of the base station 4 and uses a mobile phone when in the other area. The mobile terminal 2 supports Mobile IPv6 (Mobile Internet Protocol version 6), and can automatically switch communication IFs (corresponding to network address switching).
[0037]
The mobile terminal 2 has a navigation function. In other words, the current position (latitude, longitude, altitude) of the vehicle 20 is measured using GPS (Global Positioning System), the route from the current position to the destination is searched, and the current position and the searched route are displayed on the map. It has a function of displaying it on the display in a superimposed manner and guiding the planned travel route of the vehicle 20.
[0038]
Next, data distribution processing in the data distribution system 1 will be described with reference to FIG. FIG. 2 is a timing chart showing the flow of data distribution processing.
[0039]
A user (a driver or a passenger of the vehicle 20) can use various content services provided by the center 10 of the data distribution system 1 by operating the mobile terminal 2. As content services, for example, information distribution services such as traffic information, store information, and news, and distribution services such as voice, music, images, and moving images are assumed.
[0040]
When the user selects and downloads content, a “content request message” that is a data distribution request is transmitted from the mobile terminal 2 to the center 10. At this time, the “mobile terminal profile” is also transmitted from the mobile terminal 2 to the center 10 together with the content request message. The content request message and the mobile terminal profile may be included in one message.
[0041]
As shown in FIG. 3, the mobile terminal profile includes “terminal type” indicating the type of the mobile terminal 2 and “route information” indicating the planned movement route of the mobile terminal 2. The terminal model may use any information as long as it is useful for determining the communication performance of the mobile terminal 2. For example, the model number, product number, program version number, etc. of the mobile terminal 2 can be used. . On the other hand, the route information may be in any format as long as it represents the route on which the mobile terminal 2 is to travel. For example, data in a format in which latitudes, longitudes, and altitudes of scheduled passing points (such as intersections) of the mobile terminal 2 are arranged in the order of passage can be used.
[0042]
When the center 10 receives the mobile terminal profile together with the content request message from the mobile terminal 2, the center 10 first checks the communication performance of the mobile terminal 2. Specifically, a “mobile terminal performance request message (see FIG. 4A)” including the terminal type extracted from the mobile terminal profile is created, and the message is transmitted to the mobile terminal performance management server 12. When the mobile terminal performance management server 12 receives the message, the mobile terminal performance management server 12 extracts information (in this case, the communication speed) regarding the communication performance of the mobile terminal 2 from the terminal type, and describes the “mobile terminal performance response message (FIG. 4B) describing the communication performance. ))) "And return to the center 10.
[0043]
Next, the center 10 checks the base station through which the mobile terminal 2 passes. Specifically, a “base station confirmation message (see FIG. 5A)” including route information extracted from the mobile terminal profile is created, and the message is transmitted to the base station management server 13. When the base station management server 13 receives the message, the base station management server 13 extracts the base station 4 existing on the planned movement route of the mobile terminal 2 based on the route information. Then, the extracted communication environment information of each base station 4 is extracted, and a “base station confirmation response message (see FIG. 5B)” describing it is created and returned to the center 10. The base station confirmation response message is data in a list format in which the base station ID (network address) of each base station and the average stay time in the communication area are arranged in the order of passage of the mobile terminal.
[0044]
Through the above processing, the center 10 can acquire the communication performance of the mobile terminal 2 and the communication environment of each base station 4.
[0045]
Subsequently, the center 10 calculates the data size that can be distributed by each base station 4 based on the communication performance of the mobile terminal 2 and the communication environment information of the base station 4. Then, the base station 4 as the content transmission destination is selected from the size of the content data requested for distribution and the size that can be distributed by each base station 4, and the content data is divided for each base station. An example of a content transmission destination selection and content division algorithm will be described with reference to the flowchart of FIG.
[0046]
First, 0 is substituted for the variable n and C is substituted for the variable X to initialize n and X (steps S1 and S2). n is a variable used as a loop counter, and the number of content divisions is substituted after the end of the loop. Further, C represents the data size of the content data requested for distribution, and X is a variable representing the remaining data size of the content data, and is used for checking the loop end condition.
[0047]
After variable initialization, the loop processing of steps S3 to S6 is performed. In step S3, it is checked whether or not the variable X is 0. If X = 0, all the content data has been divided, and the process exits from the loop. If X ≠ 0, the content data is being divided, and the process proceeds to step S4.
[0048]
In step S4, the data size that can be distributed by the nth base station is calculated. Speed represents the communication speed of the mobile terminal, and SA (n) represents the average stay time in the communication area of the nth base station. These are the information received in the mobile terminal performance response message and the base station confirmation response message, respectively. The result of multiplying Speed by SA (n) is assigned to D (n). D (n) corresponds to the data size that can be distributed by the nth base station.
[0049]
In step S5, D (n) is subtracted from the variable X. That is, the data size that can be distributed by the nth base station is subtracted from the remaining data size of the content data. The result of subtraction is substituted into variable X.
[0050]
In step S6, n is incremented and the process returns to step S3 again.
[0051]
In the above loop processing, the data size that can be distributed in order from the 0th base station is calculated, and it is subtracted from the data size of the content data. Therefore, after the loop processing, the number of content divisions (also the number of content delivery destination base stations) is substituted for n, and the data size that can be delivered by each base station is substituted for D (0) to D (n-1). Will be. Based on this, the transmission destination of the content is determined, and the content can be divided.
[0052]
In the timing chart of FIG. 2, two base stations 1 and 2 are selected as content transmission destinations (the mobile terminal 2 passes through the base stations 1 and 2 in this order). Further, the content data is divided into two divided data of content 1 and content 2.
[0053]
After creating the divided data, the center 10 distributes the divided data (contents 1 and 2) to the base stations 1 and 2 before the mobile terminal 2 arrives at the communication area of each base station.
[0054]
When the center 10 receives a “content request message” that is a data distribution start request from the mobile terminal 2 that has arrived at the base station 1, the center 10 transmits a “content distribution message” to the base station 1, 1 starts data distribution of the content 1 to the mobile terminal 2. Since the data size of the content 1 is just a size that the mobile terminal 2 can receive within the communication area of the base station 1, it is possible to receive data distribution efficiently and reliably using the bandwidth of the base station 1 without waste. it can.
[0055]
The mobile terminal 2 moves to the base station 2 and receives subsequent content data. Also in this case, when the center 10 receives a “content request message” from the mobile terminal 2 that has arrived at the base station 2, the center 10 transmits a “content distribution message” to the base station 2, and sends the mobile terminal to the base station 2. Data distribution of content 2 to 2 is started. In the mobile terminal 2, the pieces of divided data are merged to generate content data.
[0056]
Thus, according to the present embodiment, the data size that can be distributed by each base station is obtained based on the actual communication performance of the mobile terminal 2 and the communication environment of each base station, and the distribution data is preliminarily determined according to the data size. Distributing to each base station minimizes the risk of data distribution processing failure, etc., reduces redundant useless communication, and efficiently distributes large volumes of data using multiple base stations. It becomes possible to do.
[0057]
Further, according to the present embodiment, the mobile terminal 2 can immediately receive distribution of the divided data buffered in the base station by simply transmitting a content request message to the data distribution system 1 (center 10). it can. That is, on the mobile terminal 2 side, there is no need to be aware of what kind of distribution processing is performed on the data distribution side (the data distribution system 1 and the base station), and a request is sent only to the data distribution system 1 as in the past. Since transmission is sufficient, processing on the mobile terminal 2 side is simplified.
[0058]
(Second Embodiment)
With reference to FIG. 7, a data distribution process in the data distribution system according to the second embodiment of the present invention will be described. FIG. 7 is a timing chart showing the flow of data distribution processing. Since the basic configuration of the data distribution system is the same as that of the first embodiment, the description here will focus on the differences from the first embodiment.
[0059]
The center 10 receives the “mobile terminal profile” together with the “content request message” from the mobile terminal 2. In the present embodiment, when the center 10 receives a content request message, the center 10 generates a “content acquisition ID” as an identifier related to the data distribution process. Then, the mobile terminal 2 is notified of the content acquisition ID.
[0060]
Subsequently, as in the first embodiment, the center 10 acquires the communication performance of the mobile terminal 2 and the communication environment of each base station, and divides the content data based on those information. Again, two base stations 1 and 2 are selected as the content transmission destinations (the mobile terminal 2 passes through the base stations 1 and 2 in this order). Further, the content data is divided into two divided data of content 1 and content 2.
[0061]
After creating the divided data, the center 10 distributes the divided data (contents 1 and 2) to the base stations 1 and 2 before the mobile terminal 2 arrives at the communication area of each base station. At the same time, the “content acquisition ID” is notified to the base stations 1 and 2 that have distributed the divided data.
[0062]
Accordingly, the mobile terminal 2 that has arrived at the base station 1 can receive the distribution of the divided data (content 1) from the base station 1 by transmitting the “content acquisition ID” to the base station 1. Similarly, when the mobile station arrives at the base station 2, it can receive the distribution of the divided data (content 2) by transmitting the “content acquisition ID”.
[0063]
Also according to the present embodiment described above, the same operational effects as those of the first embodiment can be obtained.
[0064]
In addition, according to the present embodiment, the mobile terminal 2 can immediately receive the divided data from each base station using the identifier (content acquisition ID) given from the data distribution system 1. That is, since communication between the base station and the data distribution system 1 is not required when starting actual data distribution, it is possible to reduce the processing load on the data distribution side and the network traffic.
[0065]
(Third embodiment)
With reference to FIG. 8, a data distribution process in the data distribution system according to the third embodiment of the present invention will be described. FIG. 8 is a timing chart showing the flow of data distribution processing. Since the basic configuration of the data distribution system is the same as that of the above embodiment, the description here will focus on the differences from the above embodiment.
[0066]
The center 10 receives the “mobile terminal profile” together with the “content request message” from the mobile terminal 2 and notifies the mobile terminal 2 of the “content acquisition ID” as a reply. This is the same as in the second embodiment.
[0067]
Subsequently, the center 10 acquires the communication performance of the mobile terminal 2 and the communication environment of each base station, and divides the content data based on the information. In the present embodiment, for the base station through which the mobile terminal 2 passes after the second, data including a portion overlapping at least a part of the data distributed to the base station that passes before the base station is distributed. In this way, content division is performed. That is, the content 1 for the base station 1 that passes first is created in the same manner as in the above embodiment, but the content 2 for the base station 2 that passes later is data and content of a size that can be distributed by the base station 2 It is created so as to include all or the latter half of one.
[0068]
The mobile terminal 2 arriving at the base station 1 can receive distribution of the divided data (content 1) from the base station 1 by transmitting the “content acquisition ID” to the base station 1. The mobile terminal 2 notifies the base station 1 of “Reception ACK” as a reply message to the reception of the divided data.
[0069]
The base station 1 obtains the size of distribution completed based on the reception ACK, and transmits the information to the center 10 as a “mobile terminal reception completion capacity message”. The center 10 notifies the base station 2 of the data distribution start point by transferring the content of the received mobile terminal reception completion capacity message to the next base station 2 as it is.
[0070]
When the mobile terminal 2 arriving at the base station 2 transmits the content acquisition ID to the base station 2, the base station 2 performs data distribution processing subsequently from the distribution start point received from the center 10.
[0071]
As a result, even if data of the expected size cannot be distributed due to a failure in the communication state between the base station and the mobile terminal, it is possible to recover at the next and subsequent base stations.
[0072]
In addition, each said structure is only what illustrated one Embodiment of this invention. The scope of the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the technical idea.
[0073]
For example, all of the timing charts, flowchart procedures, message structures, and the like shown in the above embodiments are examples, and can be appropriately modified as necessary.
[0074]
It is also preferable to combine the recovery process in the third embodiment with the data distribution process in the first embodiment.
[0075]
In each of the above embodiments, the average stay time is used as the communication environment information of the base station. However, it is also preferable to use information such as the size of the communication area as the communication environment information. That is, any information corresponding to the communication time that the mobile terminal can enjoy in the communication area may be used.
[0076]
【The invention's effect】
As described above, according to the present invention, a large amount of data can be efficiently distributed using a plurality of base stations.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a data distribution system according to an embodiment of the present invention.
FIG. 2 is a timing chart showing the flow of data distribution processing according to the first embodiment.
FIG. 3 is a diagram illustrating an example of a data structure of a mobile terminal profile.
4A is a diagram illustrating an example of a data structure of a mobile terminal performance request message, and FIG. 4B is a diagram illustrating an example of a data structure of a mobile terminal performance response message.
5A is a diagram illustrating an example of a data structure of a base station confirmation message, and FIG. 5B is a diagram illustrating an example of a data structure of a base station confirmation response message.
FIG. 6 is a flowchart illustrating an example of a content transmission destination selection and content division algorithm.
FIG. 7 is a timing chart showing a flow of data distribution processing according to the second embodiment.
FIG. 8 is a timing chart showing the flow of data distribution processing according to the third embodiment.
[Explanation of symbols]
1 Data distribution system
2 Mobile terminals
3 Internet
4 base stations
10 Center
11 Content DB
12 Mobile terminal performance management server
13 Base station management server
20 vehicles

Claims (8)

Mobile terminal performance management means for managing the mobile terminal model and communication performance in association with each other;
Base station management means for managing location information and communication environment information of a base station that performs radio communication with a mobile terminal in association with each other;
A distribution request receiving means for receiving a mobile terminal type and a planned movement route of the mobile terminal together with a data distribution request from the mobile terminal;
Based on the received mobile terminal type, communication performance acquisition means for acquiring communication performance of the mobile terminal from the mobile terminal performance management means,
A communication environment acquisition means for acquiring communication environment information of a plurality of base stations existing on the planned movement path from the base station management means based on the received planned movement path of the mobile terminal;
Based on the communication performance of the mobile terminal and the communication environment information of the base station, calculation means for calculating the data size that can be distributed by each base station,
A dividing means for dividing the data requested to be distributed based on the calculated data size;
A data distribution system for mobile terminals, comprising: distribution means for distributing divided data to each base station before the mobile terminal arrives at each base station. 2. The data distribution system for mobile terminals according to claim 1, further comprising distribution start means for causing the base station to start data distribution to the mobile terminal when receiving a data distribution start request from the mobile terminal arriving at the base station. By generating an identifier related to the data distribution process when receiving the data distribution request, and notifying the identifier to the mobile terminal and the base station that distributed the divided data,
The data distribution for mobile terminals according to claim 1, further comprising identifier adding means for enabling a mobile terminal that has arrived at a base station to receive distribution of data divided from the base station by transmitting an identifier to the base station. system. The distribution means distributes data including a part overlapping with at least a part of data distributed to a base station that passes before the base station to a base station through which the mobile terminal passes after the second. The data delivery system for mobile terminals of any one of 1-3. 5. The data for mobile terminals according to claim 4, further comprising means for receiving information on a completed size from a base station that has performed data distribution and notifying a next base station of a data distribution start point based on the information. Distribution system. The data distribution system for mobile terminals according to any one of claims 1 to 5, wherein the communication environment information includes a staying time when the mobile terminal passes through the communication area of the base station. Computer system
Manage the mobile terminal model and communication performance in association with each other.
Managing the location information of the base station that performs wireless communication with the mobile terminal and the communication environment information in association with each other,
Along with the data distribution request from the mobile terminal, the model of the mobile terminal and the planned travel route of the mobile terminal are received,
Based on the received mobile terminal type, obtain the mobile terminal communication performance from the mobile terminal performance management means,
Based on the received scheduled movement route of the mobile terminal, obtain communication environment information of a plurality of base stations existing on the planned movement route from the base station management means,
Based on the communication performance of the mobile terminal and the communication environment information of the base station, calculate the data size that can be distributed by each base station,
Based on the calculated data size, the requested data is divided,
A data distribution method for mobile terminals in which divided data is distributed to each base station before the mobile terminal arrives at each base station. Computer system,
A process of managing the mobile terminal model and communication performance in association with each other;
A process of managing the location information and communication environment information of a base station that performs radio communication with a mobile terminal in association with each other;
A process of receiving the mobile terminal type and the mobile terminal's planned travel route from the mobile terminal together with the data distribution request;
Based on the received mobile terminal type, processing for acquiring the communication performance of the mobile terminal from the mobile terminal performance management means,
Based on the received scheduled movement route of the mobile terminal, a process of acquiring communication environment information of a plurality of base stations existing on the planned movement route from the base station management means;
Based on the communication performance of the mobile terminal and the communication environment information of the base station, a process for calculating the data size that can be distributed by each base station,
Processing to divide the requested data based on the calculated data size,
A data distribution program for a mobile terminal that executes a process of distributing divided data to each base station before the mobile terminal arrives at each base station.

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