JP2010130090A - Data distribution device and data distribution method, program therefor, and data distribution system and data distribution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data distribution system for reducing the respective processing loads of a data distribution device, and to provide a repeater and a data receiver for transmitting and receiving distribution data. <P>SOLUTION: The data distribution device stores the distribution rate for each of two or more pieces of distribution data and performs the processing for determining, to distribute division piece data obtained by dividing one selected piece of distribution data, when the distribution rate of an already distributed amount is equal to or lower than the stipulated distribution rate for the one piece of distribution data selected from between the two or more pieces of distribution data for each of the two or more pieces of distribution data. Then, the data distribution device stores and generates the set of the division piece data, determined as being distributed and the destination information of the data receiver to be the transmission destination of the division piece data in a single transmission data packet, and transmits the generated transmission data packet to the repeater. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data distribution apparatus and a data distribution method for distributing a plurality of distribution data to a plurality of data receiving apparatuses, a program thereof, a data distribution system, and a data distribution method.

Conventionally, distribution data such as moving image data is distributed to a terminal of the distribution destination by a method such as unicast or multicast. In distribution of moving image data, distribution data to be distributed is divided into a plurality of divided piece data and sequentially transmitted. A technique related to a conventional distribution method of distribution data is disclosed in Patent Document 1.
International Publication No. 2005/027439

  Here, in distributing distribution data such as conventional moving image data, in a data distribution device that distributes distribution data, a relay device such as a router, and a data reception device that receives distribution data, the processing load of transmission / reception processing of distribution data is reduced. There is a need to reduce it.

  Therefore, the present invention provides a data distribution apparatus, a data distribution method, a program thereof, a data distribution system, and data capable of reducing each processing load of a data distribution apparatus, a relay apparatus, and a data reception apparatus that transmit and receive distribution data in the data distribution system The purpose is to provide a delivery method.

  In order to achieve the above object, the present invention provides a data distribution apparatus that distributes a plurality of distribution data to a plurality of data receiving apparatuses, and stores a transmission data amount per unit time for each of the plurality of distribution data. The transmission data amount storage unit per unit time and the transmission data amount per unit time stored in the transmission data amount storage unit per unit time for the one piece of distribution data selected from the plurality of distribution data A distribution availability determination unit that performs a process of determining to distribute divided piece data obtained by dividing the selected one piece of distribution data for each of the plurality of pieces of distribution data when the amount of transmission data per unit time is equal to or less And a set of the divided piece data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the divided piece data. Transmission data packet generation means for storing and generating the transmission data packet, and transmission data packet transmission means for transmitting the generated transmission data packet to a relay device connected via a communication network, It is a data distribution device.

  The present invention is also a data distribution method in a data distribution apparatus that distributes a plurality of distribution data to a plurality of data receiving apparatuses, wherein the transmission data amount storage unit per unit time of the data distribution apparatus includes the plurality of distribution data, respectively. The transmission data amount per unit time is stored, and the distribution possibility determination unit of the data distribution apparatus transmits the transmission data per unit time of the already distributed amount for one selected distribution data among the plurality of distribution data When the amount is equal to or less than the amount of transmission data per unit time stored in the transmission data amount storage means per unit time, a process of determining to distribute the divided piece data obtained by dividing the selected one distribution data For each of the plurality of distribution data, and a transmission data packet generation means of the data distribution device Then, a set of the determined fragment data and the destination information of the data receiving device that is the transmission destination of the fragment data is stored and generated in one transmission data packet, and the transmission data packet transmission means of the data distribution device includes A data distribution method characterized by transmitting the generated transmission data packet to a relay device connected via a communication network.

  The present invention further includes a transmission data amount storage means for storing a transmission data amount per unit time for each of a plurality of distribution data, and a data distribution device that distributes the plurality of distribution data to a plurality of data receiving devices. The transmission data amount per unit time stored in the transmission data amount storage means per unit time is stored in the transmission data amount storage unit per unit time with respect to one piece of distribution data selected from the plurality of distribution data. When it is equal to or less than the amount, a process for determining whether to distribute divided piece data obtained by dividing the selected one piece of distribution data is determined to be distributed for each of the plurality of distribution data. A set of divided piece data and destination information of a data receiving apparatus that is a transmission destination of the divided piece data is defined as one piece of transmission data. Transmitting a data packet generating means for generating and storing a packet, a program to function as the transmission data packet transmitting means, for transmitting the transmission data packet the generated to the connected relay device via a communication network.

  The present invention is also a data distribution system comprising a data distribution device that distributes a plurality of distribution data to a plurality of data reception devices and a relay device that relays the distribution data to the data reception device, wherein the data The distribution apparatus has already transmitted the transmission data amount storage unit for storing the transmission data amount per unit time for each of the plurality of distribution data, and the selected one distribution data among the plurality of distribution data. A division obtained by dividing the selected one piece of distribution data when the transmission data amount per unit time of the obtained amount is equal to or less than the transmission data amount per unit time stored in the transmission data amount storage unit per unit time A process for determining whether to distribute one piece of data; A transmission data packet generating means for generating a set of the divided piece data and the destination information of the data receiving device that is a transmission destination of the divided piece data in one transmission data packet; and the generated transmission data packet Transmission data packet transmission means for transmitting to a relay device connected via a communication network, and each set of divided piece data stored in the transmission data packet received by the relay device and its destination information A relay data packet generating means for generating one or a plurality of relay data packets in which a set of divided piece data and destination information is collected for each destination route, and transmitting the relay data packet separately for each destination route And a relay data packet transmission means.

  The present invention is also a data distribution method in a data distribution system including a data distribution device that distributes a plurality of distribution data to a plurality of data reception devices and a relay device that relays the distribution data to the data reception devices. The transmission data amount storage means of the data distribution device stores the transmission data amount per unit time for each of the plurality of distribution data, and the distribution availability determination means of the data distribution device includes the plurality of distribution data. Is selected when the transmission data amount per unit time of the already distributed amount is equal to or less than the transmission data amount per unit time stored in the transmission data amount storage means per unit time. A process of deciding to distribute divided piece data obtained by dividing one piece of distribution data, each of the plurality of distribution data The transmission data packet generation means of the data distribution device stores a set of the divided piece data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the divided piece data in one transmission data packet. The transmission data packet transmission means of the data distribution apparatus transmits the generated transmission data packet to a relay apparatus connected via a communication network, and the relay data packet generation means of the relay apparatus receives the transmission data packet. For each set of fragment data and destination information stored in the transmitted data packet, one or a plurality of relay data packets in which a set of the fragment data and the destination information is grouped for each destination route are generated. And the relay data packet transmitting means of the relay device separately transmits the relay data packet for each destination route. A data distribution method which is characterized in that signal.

According to the present invention, the data distribution apparatus transmits a UDP packet storing chunk data, which is a fragment of each distribution data distributed to each of the plurality of data reception apparatuses, to the relay apparatus. Therefore, it is not necessary to send each piece of chunk data separately, thereby reducing the number of transmissions of transmission data in the data distribution apparatus and increasing the processing load on the data distribution apparatus side. In addition, this reduces the number of packets of transmission data transmitted from the data distribution apparatus, so that overhead in the data distribution apparatus, relay apparatus, and data reception apparatus can be reduced.
Further, after determining whether the distribution rate of each distribution data is equal to or less than the specified distribution rate in the data distribution device, the UDP packet storing the chunk data of the distribution data is stored in the transmission data packet and transmitted. Therefore, even when a UDP packet storing chunk data of a plurality of distribution data to be transmitted to a plurality of different data receiving devices is transmitted, a certain distribution data follows at the same high distribution rate as other distribution data. It can be prevented from being transmitted.
Further, according to the above-described processing, since the data receiving device on the distribution data receiving side distributes each small chunk data as in the conventional case, it is not necessary to provide an unnecessarily large buffer.

Hereinafter, a data distribution system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a data distribution system according to the embodiment.
In this figure, reference numeral 10 is a data distribution apparatus that distributes distribution data, 20a and 20b are relay apparatuses that relay data transmitted from the data distribution apparatus 10 (respectively, they will be referred to as a relay apparatus 20 when they are described together), Reference numerals 30a to 30c denote data receiving apparatuses that receive distribution data (the data receiving apparatus 30 in the case where they are collectively described). In the data distribution system according to the present embodiment, the data distribution device 10 and the relay device 20a are connected via the communication network 40a, the relay device 20a and the relay device 20b are connected via the communication network 40b, and the communication network 40c is connected. An example in which the relay device 20b is connected to the data receiving device 30a and the data transmitting / receiving device 30b via the communication network 40d and the relay device 20a and the data receiving device 30c are connected via the communication network 40d will be described.

FIG. 2 is a functional block diagram of the data distribution apparatus.
As shown in FIG. 2, the data distribution apparatus 10 includes an MPEG encoder unit 11 that encodes distribution data in MPEG format, a CPU 12 that controls each processing unit of the data distribution apparatus, a ROM 13, a RAM 14, and data distribution that performs distribution data distribution processing. The processing unit 15 includes a network interface unit 16 that transmits and receives information to and from other devices.

FIG. 3 is a functional block diagram of the relay apparatus.
As shown in FIG. 3, the relay device 20 transmits / receives information to / from other devices by a control unit 21 that controls each processing unit of the relay device, a ROM 22 and a RAM 23, a data relay processing unit 24 that performs a relay process of received data. A network interface unit 25 is provided.

FIG. 4 is a functional block diagram of the data receiving apparatus.
As shown in FIG. 4, the data reception device 30 includes a CPU 31 that controls each processing unit in the data reception device 30, a ROM 32, a RAM 34, a data reception processing unit 34 that receives data transmitted from the relay device 20, and reception. An MPEG decoding processing unit 35 that performs decoding processing of the data in the MPEG format, a monitor 36, and a network interface unit 37 that transmits / receives information to / from other devices are provided.

The data distribution system according to this embodiment includes a data distribution device 10 that distributes a plurality of distribution data to a plurality of data reception devices 30 (data reception devices), and a relay device 20 that relays the distribution data to the data reception device 30. The data distribution device 10 stores the amount of transmission data per unit time for each of a plurality of distribution data, and the amount already distributed for one selected distribution data of the plurality of distribution data When the transmission data amount per unit time is equal to or less than the transmission data amount per unit time stored in the storage unit, it is determined that the divided piece data obtained by dividing the selected one distribution data is distributed. Processing is performed for each of a plurality of distribution data. Then, the data distribution device 10 generates a set of the divided piece data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the divided piece data by storing in one transmission data packet, and the generated transmission A data packet (MSP (Mix Streaming Protocol) protocol packet) is transmitted to a relay device connected via a communication network. Further, for each set of divided piece data and its destination information stored in the received transmission data packet, the relay device 20 collects one set of divided piece data and its destination information for each destination route, or A plurality of relay data packets are generated, and the relay data packets are transmitted separately for each destination route.
An object of the present invention is to reduce each processing load of a data distribution device, a relay device, and a data reception device that transmit and receive distribution data in a data distribution system by such processing.

FIG. 5 shows a packet structure of the MSP (Mix Streaming Protocol) protocol.
The distribution data transmitted from the data distribution apparatus 10 according to the present embodiment to the data reception apparatus 30 via the relay apparatus 20 has a packet configuration of the MSP (Mix Streaming Protocol) protocol shown in FIG. As shown in this figure, an MSP protocol packet includes an Ethernet (registered trademark) header (Ethernet header) and user data. The user data stores a set of chunk data of delivery data to be delivered to each of the plurality of data receiving devices 30 and destination information thereof. Specifically, as shown in FIG. 5, there are the IP header of the next destination, the UDP header, the number of chunk data (number of chunks) of each of the stored distribution data, and each chunk data (64 octets). The contents of each chunk data are the IP address (destination information) of the data receiving device 30 to which the distribution data constituting the chunk data is distributed, and 60 octet data (divided piece data) obtained by dividing the distribution data. .

FIG. 6 is a diagram illustrating an example of data of the IP header in the MSP protocol packet.
As shown in this figure, the IP header of the MSP protocol packet shown in FIG. 5 includes version, header length, service type, packet length, identifier, flag, fragment offset, lifetime, protocol number, header checksum, and start point IP. Address, destination IP address, and the like.

FIG. 7 is a diagram illustrating a data example of a UDP header in an MSP protocol packet.
As shown in this figure, the UDP header of the MSP protocol packet shown in FIG. 5 includes a start port number, an end port number, a packet length, a checksum, and the like.

FIG. 8 is a diagram illustrating a data example of a distribution list stored in the data distribution apparatus.
The distribution list shown in this figure includes an IP address of a data receiving device 30 that is a distribution destination of one or a plurality of distribution data to be distributed by the data distribution device 10, a distribution rate defined for the distribution data (per unit time) (Transmission data amount) and the file name of the distribution data are recorded in association with each other. The data distribution apparatus 10 confirms this distribution list, determines which distribution data is distributed to which destination data receiving apparatus at what distribution rate, and performs data distribution. In the example shown in FIG. 8, the IP address of the data reception device 30c is 55.55.55.55, the distribution rate at the time of distribution of distribution data distributed to the data reception device 30c is 24 Mbps, and the distribution data file It shows that the name is file 1. In addition, the IP address of the data receiving device 30a is 10.56.143.2, the distribution rate at the time of distribution of the distribution data distributed to the data receiving device 30a is 24 Mbps, and the file name of the distribution data is file 2. ing. In addition, the IP address of the data receiving device 30b is 10.56.143.3, the distribution rate at the time of distribution of distribution data distributed to the data receiving device 30b is 15 Mbps, and the file name of the distribution data is file 3. ing.

FIG. 9 is a diagram showing a routing table stored in the relay apparatus.
The routing table shown in this figure is a routing table stored in the relay device 20a. In this routing table, the communication network having the network address represented by 55.55.55.0/24 and the communication network having the network address represented by 77.777.77.0/24 are directly transmitted to the relay device 20a. It is connected (connected), and it is recorded in the communication network of the network address represented by 10.56.143.0/24 that it is transferred to the relay device 20b of 10.56.143.1. .

FIG. 10 is a diagram showing a processing flow of the data distribution apparatus.
Next, the processing flow of the data distribution apparatus will be described with reference to FIG.
In the data distribution apparatus 10 of the present embodiment, distribution data to be distributed is first recorded in the RAM 14 or a database. For example, the data distribution processing unit 15 is based on a data distribution request from the data receiving apparatus 30. It is determined whether or not to register the distribution data in the distribution list (step S101), and the file name of the requested distribution data, the destination address of the data distribution apparatus 30 that has made the distribution request, and the distribution data are distributed. The specified distribution rate is registered in association with the distribution list (step S102). This is registered in the distribution list based on a data distribution request from each of a plurality of different data receiving devices 30. Then, the data distribution processing unit 15 of the data distribution apparatus 10 reads the information described in the distribution list and determines which distribution data should be distributed to which data receiving apparatus 30 at what distribution rate. judge.

  Next, the data distribution processing unit 15 of the data distribution apparatus 10 stores the current time as information of the time T to be temporarily stored in the memory or the like (step S103), and the distribution data of all the file names registered in the distribution list is stored. It is determined whether it has been selected (step S104). If it has not been selected, distribution data is selected (step S105), and the distribution rate for distribution of chunk data constituting the selected distribution data up to the present is calculated. (Step S106). The distribution rate in the distribution of the chunk data constituting the distribution data selected here to the present is, for example, the elapsed time from the distribution start time of the chunk data constituting the distribution data to the current time. Calculated by dividing the amount of transmitted data of chunk data. Then, it is determined whether or not the distribution rate in the distribution up to now is equal to or less than the specified distribution rate of the corresponding distribution data described in the distribution list (step S107), and if it is below, the chunk constituting the selected distribution data A set of data and the IP address of the data receiving apparatus of the delivery destination is stored in the UDP packet (step S108). In other words, according to this processing, when the distribution is continued at the distribution rate specified for the selected distribution data, the chunk data is determined to be stored in the UDP packet and transmitted.

  Then, the data distribution processing unit 15 of the data distribution apparatus 10 performs the above-described processing from step S104 to step S108 for a plurality of distribution data recorded in the distribution list, and obtains the chunk data of each of the selected distribution data. A stored UDP packet is generated, and transmission data including the UDP packet is transmitted to the relay device 20a (step S109).

FIG. 11 is a diagram showing a UDP packet in transmission data transmitted by the data distribution apparatus.
As shown in this figure, the data distribution apparatus 10 obtains chunk data of distribution data of each file name of file 1, file 2, and file 3 described in the distribution list and a destination IP address of the chunk data. Correspondingly, it is stored in the UDP packet. In the UDP packet, the number of chunk data to be stored and the IP address of the destination relay device 10a are stored.

FIG. 12 is a diagram illustrating a processing flow of the relay apparatus.
Next, the processing flow of the relay apparatus will be described with reference to FIG.
When the relay device 20a receives the transmission data storing the above-described UDP packet shown in FIG. 11 from the data distribution device 10 via the communication network 40a (step S201), the data relay processing unit 24 performs the UDP in the data. It is determined whether information on all sets of one chunk data and a destination IP address has been selected from the packet (step S202). If not selected, one set is selected (step S203), and the routing table ( Based on FIG. 9, the IP address of the transfer destination to the network address of the destination IP address in the selected set is specified (step S204). Then, the data relay processing unit 24 determines whether there is a pair of chunk data and transmission destination IP address having the same transfer destination IP address (step S205), and repeats the above steps S203 to S205 to repeat the transfer destination. A UDP packet storing a set of chunk data having the same IP address and a destination IP address is generated (step S206). Further, the above-described steps S202 to S206 are repeated to generate a UDP packet storing a set of chunk data and destination IP address having the same IP address of another transfer destination. Then, a plurality of UDP packets are generated for each different IP address of the transfer destination, and transmission data storing each UDP packet is transmitted to each IP address of the transfer destination (step S207).

FIG. 13 is a diagram illustrating a first example of transmission data transmitted by the relay apparatus.
The transmission data shown in this figure is an example of transmission data that the relay device 20a transmits to the relay device 20b. In other words, the relay device 20a receives the chunk data (the chunk data whose destination is the data receiving device 30a and the data receiving device 30b) whose destination IP address paired with the chunk data indicates the network address to which the communication network 20c belongs. The transmission data stored in one UDP packet is transmitted to the relay device 20b. When the relay device 20b retransmits the transmission data, the chunk data in the UDP packet creates separate transmission data and transmits the data to each data relay device 30a and the data relay device 30b.

FIG. 14 is a diagram illustrating a second example of transmission data transmitted by the relay apparatus.
The transmission data shown in this figure is an example of transmission data that the relay device 20a transmits to the data reception unit 30c via the communication network 40d. That is, since the relay device 20a stores only one chunk data to be transmitted to the network address of the communication network 40d in the transmission data received from the data distribution device 10, the relay device 20a transmits a UDP packet including this chunk data. It is generated and transmitted to the data receiving device 30c.

  Here, when the data distribution device 10 distributes the distribution data to the data receiving device 30, conventionally, when the data distribution device 10 distributes the data by unicast, the amount of chunk data that is a divided piece of the distribution data stored in the transmission data packet If a large number of transmission data packets are required to complete the distribution of one piece of distribution data, and multiple distribution data must be distributed, the value multiplied by the number of distribution data The number of transmission data packets is required, and the overhead of the data distribution device 10, the relay device 20, and the data reception device 30 is large, and it has been a problem to reduce the number of packets. Further, in streaming video data represented by MPEG, if the amount of chunk data included in the UDP packet is increased, a large buffer must be prepared in the relay device 20 or the data center of gravity device, so that sufficient throughput can be secured. If so, it is desirable that the amount of chunk data stored in the UDP packet in the transmission data is small.

Therefore, as described above, the data distribution device transmits a UDP packet storing chunk data, which is a divided piece of each distribution data distributed to each of the plurality of data reception devices, to the relay device. The apparatus does not need to send chunk data for each of a plurality of distribution data separately, thereby reducing the number of transmissions of transmission data in the data distribution apparatus and increasing the processing load on the data distribution apparatus side. In addition, this reduces the number of packets of transmission data transmitted from the data distribution apparatus, so that overhead in the data distribution apparatus, relay apparatus, and data reception apparatus can be reduced.
Further, after determining whether the distribution rate of each distribution data is equal to or less than the specified distribution rate in the data distribution device, the UDP packet storing the chunk data of the distribution data is stored in the transmission data packet and transmitted. Therefore, even when a UDP packet storing chunk data of a plurality of distribution data to be transmitted to a plurality of different data receiving devices is transmitted, a certain distribution data follows at the same high distribution rate as other distribution data. It can be prevented from being transmitted.
Further, according to the above-described processing, since the data receiving device on the distribution data receiving side distributes each small chunk data as in the conventional case, it is not necessary to provide an unnecessarily large buffer.

  As mentioned above, although embodiment of this invention was described, each above-mentioned apparatus has a computer system inside. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of a data delivery system. It is a functional block diagram of a data delivery apparatus. It is a functional block diagram of a relay apparatus. It is a functional block diagram of a data receiver. This is a packet configuration of the MSP protocol. It is a figure which shows the example of data of the IP header in a MSP protocol packet. It is a figure which shows the example of data of the UDP header in a MSP protocol packet. It is a figure which shows the example of data of a delivery list. It is a figure which shows the routing table which a relay apparatus memorize | stores. It is a figure which shows the processing flow of a data delivery apparatus. It is a figure which shows the UDP packet in transmission data. It is a figure which shows the processing flow of a relay apparatus. It is a figure which shows the 1st example of the transmission data which a relay apparatus transmits. It is a figure which shows the 2nd example of the transmission data which a relay apparatus transmits.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Data delivery apparatus 20, 20a, 20b ... Relay apparatus 30, 30a-30c ... Data receiver 40, 40a-40d ... Communication network

Claims (5)

A data distribution device for distributing a plurality of distribution data to a plurality of data receiving devices,
A transmission data amount storage means for storing a transmission data amount per unit time for each of the plurality of distribution data;
For one selected delivery data of the plurality of delivery data, the amount of transmission data per unit time that has already been delivered is less than or equal to the amount of transmission data per unit time stored in the transmission data amount storage means per unit time. In a case where there is a distribution availability determination unit that performs a process of determining to distribute divided piece data obtained by dividing the selected one distribution data, for each of the plurality of distribution data;
Transmission data packet generation means for generating a set of the fragment data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the fragment data in one transmission data packet;
Transmission data packet transmission means for transmitting the generated transmission data packet to a relay device connected via a communication network;
A data distribution apparatus comprising: A data distribution method in a data distribution device for distributing a plurality of distribution data to a plurality of data receiving devices,
The transmission data amount storage means per unit time of the data distribution device stores the transmission data amount per unit time for each of the plurality of distribution data,
The transmission possibility amount determining unit of the data distribution apparatus is configured such that the transmission data amount per unit time of the already distributed amount of the plurality of distribution data is the transmission data amount storage unit per unit time. When the transmission data amount per unit time stored in is less than or equal to the number of pieces of transmission data obtained by dividing the selected one piece of distribution data, a process for determining that each piece of the plurality of pieces of distribution data is distributed is performed.
The transmission data packet generation means of the data distribution device stores and generates a set of the divided piece data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the divided piece data in one transmission data packet And
A transmission data packet transmitting means of the data distribution apparatus transmits the generated transmission data packet to a relay apparatus connected via a communication network. A computer of a data distribution device that includes a transmission data amount storage unit that stores a transmission data amount per unit time for each of a plurality of distribution data, and distributes the plurality of distribution data to a plurality of data receiving devices.
For one selected delivery data of the plurality of delivery data, the amount of transmission data per unit time that has already been delivered is less than or equal to the amount of transmission data per unit time stored in the transmission data amount storage means per unit time. A delivery permission / inhibition determining means for performing a process of determining to deliver divided piece data obtained by dividing the selected delivery data in each case for each of the plurality of delivery data;
A transmission data packet generating means for storing and generating a set of the divided piece data determined to be distributed and the destination information of the data receiving device as a transmission destination of the divided piece data in one transmission data packet;
Transmission data packet transmission means for transmitting the generated transmission data packet to a relay device connected via a communication network;
Program to function as. A data distribution system comprising a data distribution device that distributes a plurality of distribution data to a plurality of data reception devices and a relay device that relays the distribution data to the data reception device,
The data distribution device is
A transmission data amount storage means for storing a transmission data amount per unit time for each of the plurality of distribution data;
For one selected delivery data of the plurality of delivery data, the amount of transmission data per unit time that has already been delivered is less than or equal to the amount of transmission data per unit time stored in the transmission data amount storage means per unit time. In a case where there is a distribution availability determination unit that performs a process of determining to distribute divided piece data obtained by dividing the selected one distribution data, for each of the plurality of distribution data;
Transmission data packet generation means for generating a set of the fragment data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the fragment data in one transmission data packet;
Transmission data packet transmission means for transmitting the generated transmission data packet to a relay device connected via a communication network,
The relay device is
For each set of divided piece data and destination information stored in the received transmission data packet, one or more relay data packets in which a set of divided piece data and destination information is collected for each destination route. Relay data packet generating means for generating;
Relay data packet transmission means for separately transmitting the relay data packet for each destination route;
A data distribution system comprising: A data distribution method in a data distribution system comprising: a data distribution device that distributes a plurality of distribution data to a plurality of data reception devices; and a relay device that relays the distribution data to the data reception device,
The transmission data amount storage means of the data distribution device stores the transmission data amount per unit time for each of the plurality of distribution data,
The transmission possibility amount determining unit of the data distribution apparatus is configured such that the transmission data amount per unit time of the already distributed amount of the plurality of distribution data is the transmission data amount storage unit per unit time. When the transmission data amount per unit time stored in is less than or equal to the number of pieces of transmission data obtained by dividing the selected one piece of distribution data, a process for determining that each piece of the plurality of pieces of distribution data is distributed is performed.
The transmission data packet generation means of the data distribution device stores and generates a set of the divided piece data determined to be distributed and the destination information of the data receiving device that is the transmission destination of the divided piece data in one transmission data packet And
The transmission data packet transmission means of the data distribution device transmits the generated transmission data packet to a relay device connected via a communication network,
The relay data packet generation means of the relay device sets a set of the fragment data and the destination information for each destination route for each of the fragment data stored in the received transmission data packet and the destination information. Generate one or more relay data packets that are combined
A data distribution method, wherein the relay data packet transmitting means of the relay device transmits the relay data packet separately for each destination route.

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