JP2013048327A - Distribution network and server, and distribution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution network system for avoiding impairment of QoE of a user, by avoiding access concentration to a distribution server.SOLUTION: Two or more servers (cash server or proxy server) are provided on a mobile network. Each server comprises: an accumulation part 113 for temporarily accumulating a copy of a content for at least part of contents retained by a distribution server; a content list creation part 118 for creating a list of the content accumulated by the accumulation part; and a collection part 116 for collecting the content list of the content accumulated by the server and a content list of contents accumulated by other servers. Each server also comprises: an identification part 117 for identifying a server having a content requested by a terminal by using the content list collected by the collection part; and an assurance part 112 for reading out a file or stream of the content requested by the terminal from the identified server, considering coordination between the servers.

Description

  The present invention relates to a technology for distributing content from a distribution server, and more particularly to a distribution network, a server, and a distribution method.

  The mobile network is scheduled to be increased in speed and capacity by LTE (Long Term Evolution) and EPC (Evolved Packet Core) technologies. With this progress, contents will be carried through the network in the future. Content distribution distributed to various terminals including terminals is expected to become widespread.

  In Patent Document 1, as a method for managing cacheable streaming content requested by a mobile node, streaming content is supplied using a caching proxy in response to a request from a mobile node located in the first subnet. Caching the streaming content provided by the caching proxy, and if the mobile node moves to a second subnet, the request is sent to another caching proxy different from the caching proxy. Handoff, interrupting caching of the streaming content using the caching proxy, and streaming content fragments cached in the caching proxy. A cacheable streaming content management method is disclosed that includes a step of quantifying in order to obtain a single size (as will be described later, the present invention has a problem and a configuration). It ’s completely different).

JP 2003-289327 A

  The analysis given by the present invention is shown below.

  In the future, in the mobile network, it is predicted that the traffic volume of the data system will increase from 8 times to 10 times or more over the year 2013 and video content will occupy most of it. In addition, the size of video content is also increasing due to the high performance of terminal capabilities accompanying the rapid spread of smartphones, and it is expected that high-capacity content with high-definition resolution will be distributed in the near future in mobile networks. Is done.

  On the other hand, when content is distributed on a mobile network, in the conventional configuration for distributing content on the Internet, content requests from all terminals are transmitted to a distribution server on the Internet network via a packet transfer device. The distribution server distributes content to all terminals via the packet transfer device.

  However, such related technologies have the following problems.

  When access is concentrated on distribution servers on the Internet due to popular contents on the Internet, there is a problem that the network may be congested because the network traffic is concentrated.

  In addition, when the network becomes congested, the delay until the video is played back on the terminal becomes longer, the video played back on the terminal stops, the packet loss occurs frequently, and the image is greatly disturbed. There is a problem that a user's QoE (Quality of Experience) is impaired.

  An object of the present invention is to provide a distribution network system, a server, and a distribution method that solve the above-described problems without modifying a terminal.

  According to one aspect of the present invention, two or more cache servers or proxy servers are arranged on a mobile network, and at least a part of the content held by a distribution server that distributes content on the Internet is stored in the content. A storage unit that temporarily stores a copy, a content list generation unit that generates and outputs a list of content stored in the storage unit, a content list stored by itself, and a content stored by a cache server or proxy server other than itself A collection unit that collects a list; information included in a content request message from the terminal; a determination unit that determines a cache server or a proxy server having a requested content using an output signal of the collection unit; Cache server or proxy server A read-out unit that reads a file or stream of the requested content in consideration of cooperation between cache servers or cooperation between proxy servers, and a distribution unit that outputs the read-out file or stream according to a predetermined protocol, Is provided in a cache server or a proxy server.

  According to another aspect of the present invention, each server connected to a network node connected to a mobile network and functions as a cache server or a proxy server, which is a content server possessed by a distribution server that distributes content over the Internet. A storage unit that temporarily stores a copy of the content for at least a part, a content list creation unit that creates a list of content stored in the storage unit, a content list stored in the own server, and other than the own server The server having the content requested from the terminal is collected using the collection unit that collects the content list stored in the server, the information included in the content request message from the terminal, and the content list collected in the collection unit From the discriminating unit and the discriminated server A server is provided that includes a securing unit that reads a file or stream of a content requested from the terminal by cooperation between servers, and a distribution unit that outputs the read file or stream using a predetermined protocol. .

According to still another aspect of the present invention, a plurality of servers are provided on a mobile network, and a server functioning as a cache server or a proxy server
A copy of the content is temporarily stored in the storage unit for at least a part of the content held by the distribution server that distributes the content on the Internet,
Creating a list of the content to be stored;
Collecting a content list stored in its own server and a content list stored in a server other than its own server among the plurality of servers,
Determining information contained in the content request message from the terminal and the server having the requested content using the content list;
A file or stream of the requested content is read from the determined server by cooperation between servers,
There is provided a distribution method for outputting and distributing the read file or stream according to a predetermined protocol.

  According to the present invention, it is possible to avoid the occurrence of a congestion state and a decrease in QoE in a network due to concentrated access to distribution servers on the Internet.

It is a figure which shows the connection structure of the 1st Embodiment of this invention. It is a figure which shows the structural example of the cache server in 1st Embodiment. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the connection structure of the 2nd Embodiment of this invention. It is a figure which shows the modification of 2nd Embodiment.

  According to the present invention, the distribution network caches content including moving images, still images, audio, software, applications, etc. in the mobile network, and then various terminals (for example, mobile phones, smartphones, PCs, game machines, etc.). Deliver to.

  According to one of several preferred embodiments of the present invention, there are two or more servers on a mobile network, the servers function as cache servers or proxy servers, and a distribution server that distributes content on the Internet is provided. A storage unit (113) that temporarily stores a copy of the content for at least a part of the content held, a content list creation unit (118) that creates a list of content stored in the storage unit, A collecting unit (116) for collecting the content list accumulated by the accumulation unit, a content list accumulated by a server other than the own server, information included in a content request message from a terminal, and the collecting unit Using the collected content list, a service having the content requested from the terminal. A determination unit (117) for determining a buffer, a reservation unit (112) for reading out a file or stream of a content requested from the terminal from the determined server in consideration of cooperation between servers, and the read A distribution unit (114) for outputting a file or a stream according to a predetermined protocol.

According to another preferred form of the method, the following steps are executed by a server that is provided in a plurality of units on the mobile network and functions as a cache server or a proxy server. A copy of the content is temporarily stored in the storage unit for at least a part of the content held by the distribution server that distributes the content on the Internet (step 1).
A list of contents to be stored is created (step 2);
Collecting a content list stored in the server itself and a content list stored in a server other than the server among the plurality of servers (step 3);
Determining information contained in the content request message from the terminal and the server having the requested content using the content list (step 4);
The requested content file or stream is read from the determined server by cooperation between the servers (step 5),
The read file or stream is output and distributed according to a predetermined protocol (step 6).

  Embodiments of the present invention will be described in detail with reference to FIGS. In the following embodiments, description will be made in accordance with a configuration example of a moving image as an example of content, but the same configuration may be used for still images, audio, audio, software, applications, data, and the like. it can.

<Embodiment 1>
FIG. 1 is a diagram showing a configuration of a distribution network according to the first embodiment of this invention. In the first embodiment, a configuration in which a 3G mobile packet network is used as a mobile network and an xGSN device is used as a packet transfer device is shown. XGSN (serving / gateway General packet radio support node) integrates the functions of Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (GGSN) Node. FIG. 1 shows a configuration using a cache server. In FIG. 1, a distribution server 121 on the Internet network 145 stores various contents on the Internet. In the following description, these contents are referred to as “OTT (Over The Top) contents”. The content is a compression-encoded bitstream of content including at least one of moving images, still images, audio, audio, etc. or a file storing the compression-encoded bitstream. Or data. Moreover, although a portable terminal is used as a terminal, other terminals can also be used.

  N (N ≧ 2) xGSN apparatuses 190_1 to 190_N are arranged on the mobile network 150. RNC (Radio Network Controller :) devices (radio base station control devices) 195_1 to 195_L (L ≧ 2) are connected to the xGSN device 190_1, and RNC devices 197_1 to 197_L are connected to the xGSN device 190_N. Similarly, L RNC devices are connected to the xGSN device 190_2. However, in FIG. 1, the L RNC devices connected to the xGSN device 190_2 are simply omitted for the convenience of drawing.

  Furthermore, M base stations (M ≧ 2) are connected per RNC device. For example, M base station apparatuses 180_1 to 180_M are connected to the RNC apparatus 195_1, and M base station apparatuses 181_1 to 181_M are connected to the RNC apparatus 195_L. Further, M base station apparatuses 182_1 to 182_M are connected to the RNC apparatus 197_1, and M base station apparatuses 183_1 to 183_M are connected to the RNC apparatus 197_L.

  One cache server is connected to the GGSN function unit of each xGSN device. For example, the cache server 110_1 is connected to the xGSN device 190_1. Here, the xGSN device has a device configuration in which the SGSN function unit and the GGSN function unit are installed at the same place.

  When the mobile terminal 170 issues a connection request message for distribution describing the URL (Uniform Resource Locator) of the requested content, the base station (in the case of FIG. 1, one of 181_1 to 181_M) The connection request message is received, and the connection request message is sent to the RNC device (in the case of FIG. 1, 195_L) that manages the base station.

  The RNC device 195-L receives the connection request message from the base station, and in the payload portion of a GTP (General Packet Radio Service (GPRS) Tunneling Protocol) packet, the connection request message and the IP (Internet) of the distribution server. Protocol) address, the IP address of the portable terminal 170, etc. are stored, and the GTP packet is transferred to the xGSN device 190_1 collecting RNC devices 195_1 to 195_L.

  Next, the xGSN device 190_1 receives the GTP packet.

  The cache server 110_1 is connected to the Gi interface of the GGSN function unit of the xGSN device 190_1, for example, and the cache server 110_N is connected to the Gi interface of the GGSN function unit of the xGSN device 190_N. The cache servers are connected to each other so that the contents can be linked.

  As a typical configuration of the cache server, FIG. 2 shows a configuration of the cache server 110_1 connected to the xGSN device 190_1. Since the other cache servers 110_2 to 110_N have the same configuration as the cache server 110_1, description will be given by using 110_1 as a representative, and description of the other cache servers 110_2 to 110_N will be omitted.

In FIG. 2, the control signal transmitting / receiving unit 111
A connection request message from the mobile terminal 170;
The received IP address of the portable terminal 170;
A GTP packet storing the URL of the requested content, etc .;
Is received from the xGSN device 190_1.

  In addition, the location information of the mobile terminal 170 is received from the xGSN device.

The analysis unit 115 reads the content of the connection request message stored in the payload portion of the received GTP packet, and extracts information such as the received IP address of the mobile terminal 170 and the URL of the requested content. And
The requested content URL, the received IP address of the portable terminal 170, and the like are output to the distribution unit 114 and the determination unit 117.

  The collection unit 116 inputs the content list of content stored in the own device (own cache server) and the content list of content stored in a cache server other than the own device, and outputs the content list to the determination unit 117.

  Here, collection of the content list may be performed at predetermined time intervals (periodically), may be performed when a connection request is received from the mobile terminal 170, or another cache server It may be performed when a predetermined event occurs, such as when there is a collection request from.

The determination unit 117
The received IP address of the portable terminal 170;
Information such as the URL of the requested content;
A content list of content stored on the device,
A content list of content stored in a cache server other than its own device;
Enter
It is determined whether the content requested by the portable terminal 170 is stored by the own device or by another cache server. When accumulating on the own cache server,
A temporary content storage unit 113;
A delivery unit 114;
In response, a read / delivery instruction is issued.

  On the other hand, when the other cache server accumulates, the content securing unit 112 is notified of the requested content URL and the IP address of the other cache server, and from the other cache server by cooperation between the cache servers. Instruct to secure content.

  When neither the own cache server nor any other cache server other than the own cache server has accumulated the requested content, an instruction is issued from the distribution server device 121 to the content securing unit 112 to secure the content. .

  The content securing unit 112 includes the URL of the content requested from the determination unit 117, the content securing instruction, the IP address of the other cache server in the case of another cache server, and the distribution server in the case of the distribution server device 121. The IP address of the device 121 is input, and a copy of the requested content is secured and output to the temporary content storage unit 113. The content temporary storage unit 113 stores the content.

  When the content read instruction is input from the determination unit 117 to the content temporary storage unit 113, the content temporary storage unit 113 reads the content file corresponding to the requested content URL and outputs the content file to the distribution unit 114.

The content list creation unit 118 creates a list of all the content stored in the temporary content storage unit 113 as needed,
At predetermined time intervals, or
When requested by another cache server, or
When there is a request from the collecting unit 116,
Output content list.

The distribution unit 114
The URL information of the requested content is input from the analysis unit 115,
The content distribution instruction is input from the determination unit 117,
The requested content file is input from the temporary content storage unit 113,
A packet of a predetermined protocol (for example, TCP (Transmission Control Protocol)) is generated, transmitted to the xGSN device, and distributed to the mobile terminal 170 via the xGSN device.

  This is the end of the description of the first embodiment, but various modifications are possible. Although FIG. 1 shows a configuration in which one cache server is connected to one xGSN device, a configuration in which one cache server is connected to a plurality of xGSN devices, or one xGSN device can be used. On the other hand, it can also be set as the structure which connects a some cache server.

  The distribution server device 121 may be connected to the cache server devices 110_1 to 110_N.

  Furthermore, in FIG. 1, although it was set as the structure which uses the xGSN apparatus which integrated the SGSN apparatus and the GGSN apparatus, the structure which isolate | separated the SGSN apparatus and the GGSN apparatus can also be taken. In the case of this configuration, it is possible to adopt a configuration in which at least one cache server is connected to either the SGSN device or the GGSN device.

  The mobile terminal 170 may be a mobile phone, a smartphone, a tablet, a PC (personal computer) equipped with a data communication card, or a mobile 3G network (third generation mobile). Any other terminal can be used as long as it can communicate with the communication network.

<Modification of Embodiment 1>
FIG. 3 is a diagram illustrating a modification of the first embodiment. In this modification, proxy servers 120_1 to 120_N are provided instead of the cache servers 110_1 to 110_N in FIG. In FIG. 3, the constituent elements having the same numbers as those in FIG. 1 perform the same operations as those in FIG.

  Here, the proxy server 120_1 can be of two types, a transparent type and a completely transparent type. In the case of the transmission type, the message signal from the portable terminal 170 is once terminated by the proxy server, and the message signal is analyzed. The content temporarily stored in the proxy server is distributed from the proxy server to the mobile terminal 170. If necessary, the proxy server makes a request or access to the distribution server 121 via the xGSN device.

  On the other hand, in the case of the completely transparent type, the proxy server does not terminate the signal from the portable terminal 170, and does not terminate the DPI (Deep Packet Inspection) technology (control information of packets exchanged between the Internet user and the server. The header part of the packet, etc., and the information such as the URL of the requested content and the IP address of the mobile terminal 170 is extracted, and the requested content is cached in the proxy server. In the case where the proxy server is present, the proxy server issues a distribution stop instruction to the distribution server 121 via the xGSN device, and then distributes the requested content from the proxy server.

  The configuration of the proxy server (main part related to the subject of the present invention) is the same as the configuration of the cache server in FIG.

<Embodiment 2>
Next, a second embodiment will be described with reference to FIG. FIG. 4 shows a configuration in which, as the mobile network 250, the LTE (Long Term Evolution) / EPC (Evolved Packet Core) network 250, which is a 3.9 generation mobile network, is used instead of the 3G mobile network 150 shown in FIG. Show.

  In LTE, the functions of the base station device and the RNC device are degraded, and only the eNodeB device is provided. In EPC, an S / P-GW (Serving / Packet Data-Gateway) device is connected to an eNodeB (evolved NodeB) device. Here, the S / P-GW (Serving Packet data network gateway) device has a configuration in which an S-GW (Serving-Gateway) device and a P-GW (Packet data network gateway) device are integrated.

  FIG. 4 shows a configuration in which M eNodeB devices are connected to one S / P-GW device. For example, eNodeB devices 260_1 to 260_M are connected to the S / P-GW device 290_1.

  In the example of FIG. 4, one cache server 410 is connected to each of the S / P-GW apparatuses 290_1 to 290_N. For example, the cache server 410_1 is connected to the S / P-GW apparatus 290_1. The cache servers are connected so that the contents can be linked (one cache server can secure and distribute the content stored in the storage unit of another cache server).

  When the mobile terminal 170 issues a connection request message for distribution by designating the IP address of the distribution server device 121, the eNodeB device in the area (any one of 261_1 to 261_M in FIG. 4) sends the connection request message. Receive.

  When any of the eNodeB devices 261_1 to 261M receives the connection request message, it stores the connection request message, the IP address of the distribution server, the IP address of the mobile terminal, and the like in the payload portion of the GTP protocol. Transfer the GTP packet to the P-GW apparatus.

  The cache server 410_1 has the same configuration as that shown in FIG. 2, but in this embodiment, the connection destination of the control signal transmission / reception unit 111 is the S / P-GW apparatus 290_1 in FIG.

A connection request message from the mobile terminal 170;
GTP packet storing IP address etc.
Location information of the mobile terminal 170,
Is received from the S / P-GW apparatus 290_1. The same applies to the other cache servers 410_2 to 410_N, and the above-described exchange is performed with the S / P-GW apparatuses 290_2 to 290_N connected thereto.

  This is the end of the description of the third embodiment, but various modifications are possible. In FIG. 4, the S / P-GW apparatus in which the S-GW apparatus and the P-GW apparatus are integrated is used. However, the S-GW apparatus and the P-GW apparatus can be separated. In the case of this configuration, it is possible to adopt a configuration in which at least one cache server is connected to either the S-GW device or the P-GW device.

  In addition, the mobile terminal 170 may be a mobile phone, a smartphone, a PC equipped with a data communication card, or any other terminal that can communicate with the mobile 3.9G network. A terminal can also be used.

<Modification of Embodiment 2>
FIG. 5 is a diagram illustrating a modification of the second embodiment. In this modification, proxy servers 120_1 to 120_N are provided instead of the cache servers 410_1 to 410_N in FIG. In FIG. 5, the constituent elements having the same numbers as those in FIG. 4 perform the same operations as those in FIG. In this modification, the proxy server has the same configuration as that described with reference to FIG.

<Effect>
According to this embodiment, there exist the following effects.

(1) For content on the Internet, a cache server or proxy server temporarily stores a copy of the content, a content list stored by the own device (cache server or proxy server), and a content list stored by a device other than the own device collect. Then, for the content requested by the terminal, the cache server or proxy server having the requested content is determined in consideration of cooperation between cache servers or cooperation between proxy servers. Further, the content requested from the determined cache server or proxy server is read and distributed. By doing this, there is an effect that traffic on the network can be reduced, traffic due to concentration of access to popular contents can be reduced, and network congestion can be prevented.

  (2) By reducing traffic, the delay until video is played back on the terminal is kept short, and the quality of experience (QoE) of the user is kept good without stopping the video being played on the terminal. There is an effect that can be.

  Further, the effect (1) can be obtained without having to modify the terminal at all.

<Comparison with Patent Document 1>
In Patent Document 1 described above, in order to deliver streaming content from the first caching proxy to the second caching proxy as a configuration in which streaming can be continuously performed when the mobile node changes from the first subnet to the second subnet. The configuration is disclosed. On the other hand, according to the present invention, when distributing the content requested from the terminal, a plurality of cache servers or a plurality of proxy servers cooperate with each other to secure the requested content. Discrimination for discriminating the cache server or proxy server having the requested content using the collection unit that collects the content list stored in the server or proxy server, and the information included in the content request message from the terminal and the output signal of the collection unit And a securing unit that reads a file or stream of content requested from the determined cache server or proxy server in consideration of cooperation between cache servers or cooperation between proxy servers, and the read file or stream in advance Output according to a defined protocol That the delivery part and discloses the configuration of the cache server or the proxy server having, the invention described in patent document 1 is different from the purpose and structure at all.

  It should be noted that the disclosures of the above patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

  A part or all of the above embodiment is described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
With multiple servers on the mobile network,
The server
Functions as a cache server or proxy server,
A storage unit that temporarily stores a copy of the content for at least part of the content held by a distribution server that distributes the content on the Internet;
A content list creation unit for creating a list of content stored in the storage unit;
A collection unit that collects the content list created by the content list creation unit and stored by the storage unit of the server and a content list stored by a server other than the server among the plurality of servers;
Using the information included in the content request message transmitted from the terminal via the mobile network and the content list collected by the collection unit, the server having the content requested by the terminal in the storage unit is determined. A discriminator to perform,
A securing unit that reads a file or stream of content requested from the terminal from the server determined by the determining unit to the own server through cooperation between servers;
A delivery unit for outputting the read file or stream according to a predetermined protocol;
A distribution network system characterized by comprising:

(Appendix 2)
As a result of the determination, if the server that accumulates the content requested from the terminal in the storage unit is its own server, the determination unit reads and distributes the storage unit and the distribution unit. Give instructions,
When another server accumulates the content requested from the terminal, the determination unit sends the URL (Uniform Resource Locator) of the content requested from the terminal and the other server to the securing unit. The IP address of the server and instructing the other server to secure the content, and the securing unit accumulates a copy of the requested content secured from the other server in the storage unit,
When neither the local server nor the other server has accumulated the content requested from the terminal, the determination unit sends the URL of the content requested from the terminal to the securing unit; Tell the IP address of the distribution server, issue an instruction to secure content from the distribution server, the securing unit accumulates a copy of the requested content secured from the distribution server in the storage unit, The distribution network system according to Supplementary Note 1, wherein

(Appendix 3)
The distribution network system according to appendix 1 or 2, wherein the content includes at least one of a moving image, a still image, audio, audio, software, application, and data.

(Appendix 4)
The server
Serving GPRS (General Packet Radio Service) Support Node (SGSN),
Gateway GPRS support node (GGSN),
A node that combines a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN) into one;
Serving gateway (S-GW),
Packet data network gateway (P-GW),
A node that combines a serving gateway (S-GW) and a packet data network gateway (P-GW) into one;
One of the nodes,
Or
The distribution network system according to any one of appendices 1 to 3, connected to the distribution server.

(Appendix 5)
1 server is connected to 1 node 1: 1
The distribution network system according to appendix 4, wherein one server is connected to a plurality of (N) nodes at 1: N.

(Appendix 6)
A server that is connected to each network node connected to the mobile network and functions as a cache server or a proxy server,
A storage unit that temporarily stores a copy of the content for at least part of the content held by a distribution server that distributes the content on the Internet;
A content list creation unit for creating a list of content stored in the storage unit;
A collection unit for collecting a content list stored in the local server and a content list stored in a server other than the local server;
A discriminating unit for discriminating a server having the content requested from the terminal using the information included in the content request message from the terminal and the content list collected by the collecting unit;
A securing unit that reads a file or stream of content requested from the terminal from the determined server by cooperation between servers;
A delivery unit for outputting the read file or stream according to a predetermined protocol;
A server characterized by comprising:

(Appendix 7)
As a result of the determination, if the server that accumulates the content requested from the terminal in the storage unit is its own server, the determination unit reads and distributes the storage unit and the distribution unit. Give instructions,
When another server accumulates the content requested from the terminal, the determination unit sends the URL (Uniform Resource Locator) of the content requested from the terminal and the other server to the securing unit. The IP address of the server and instructing the other server to secure the content, and the securing unit accumulates a copy of the requested content secured from the other server in the storage unit,
When neither the local server nor the other server has accumulated the content requested from the terminal, the determination unit sends the URL of the content requested from the terminal to the securing unit; Tell the IP address of the distribution server, issue an instruction to secure content from the distribution server, the securing unit accumulates a copy of the requested content secured from the distribution server in the storage unit, The server according to supplementary note 6, wherein

(Appendix 8)
The server according to claim 6, wherein the content includes at least one of a moving image, a still image, sound, audio, software, application, and data.

(Appendix 9)
The network node is a serving GPRS (General Packet Radio Service) support node (SGSN),
Gateway GPRS support node (GGSN),
A node that combines a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN) into one;
Serving gateway (S-GW),
Packet data network gateway (P-GW),
A node that combines a serving gateway (S-GW) and a packet data network gateway (P-GW) into one;
One of the nodes, or
The server according to any one of appendices 6 to 8, including any one of the distribution servers.

(Appendix 10)
1 server is connected to 1 node 1: 1
The server according to appendix 9, wherein one server is connected to a plurality (N) of the nodes at 1: N.

(Appendix 11)
A server that functions as a cache server or a proxy server provided on a mobile network.
A copy of the content is temporarily stored in the storage unit for at least a part of the content held by the distribution server that distributes the content on the Internet,
Creating a list of the content to be stored;
Collecting a content list stored in its own server and a content list stored in a server other than its own server among the plurality of servers,
Determining information contained in the content request message from the terminal and the server having the requested content using the content list;
A file or stream of the requested content is read from the determined server by cooperation between servers,
A delivery method comprising: outputting and delivering the read file or stream according to a predetermined protocol.

(Appendix 12)
As a result of the determination, if the server that stores the content requested from the terminal is its own server, it issues a read / distribution instruction from the storage unit,
When another server accumulates the content requested from the terminal, based on the URL (Uniform Resource Locator) of the content requested from the terminal and the IP address of the other server, from the other server, Instructing to secure the content, storing a copy of the requested content secured from the other server in the storage unit,
When neither the self server nor the other server stores the content requested from the terminal, the distribution server is based on the URL of the content requested from the terminal and the IP address of the distribution server. 12. The distribution method according to claim 11, wherein an instruction to secure content is issued from the distribution server, and the securing unit accumulates a copy of the requested content secured from the delivery server in the storage unit.

(Appendix 13)
13. The distribution method according to appendix 11 or 12, wherein the content includes at least one of a moving image, a still image, audio, audio, software, application, and data.

(Appendix 14)
The server
Serving GPRS (General Packet Radio Service) Support Node (SGSN),
Gateway GPRS support node (GGSN),
A node that combines a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN) into one;
Serving gateway (S-GW),
Packet data network gateway (P-GW),
A node that combines a serving gateway (S-GW) and a packet data network gateway (P-GW) into one;
The delivery method according to any one of appendices 11 to 13, which is connected to any one of the nodes or the delivery server.

(Appendix 15)
1 server is connected to 1 node 1: 1
15. The delivery method according to appendix 14, wherein one server is connected to a plurality (N) of the nodes at 1: N.

110_1 to 110_N, 410_1 to 410_N Cache server 111 Control signal transmission / reception unit 112 Content securing unit 113 Content temporary storage unit 114 Distribution unit 115 Analysis unit 116 Collection unit 117 Determination unit 118 Content list creation unit 120_1 to 120_N Proxy server 121 Distribution server 145 Internet Network 150 Mobile network 170 Portable terminals 180_1 to 180_M, 181_1 to 181_M, 182_1 to 182_M, 183_1 to 183_M Base station devices 190_1 to 190_N xGSN devices 195_1 to 195_L, 197_1 to 197_L RNC device 250 Mobile LTE / EPC networks 260_1 to 260_M, 261_1 ~ 261_M, 262_1 to 262_M eNodeB devices 290_1 ~ 290_N S / P-GW equipment

Claims (10)

With multiple servers on the mobile network,
The server
Functions as a cache server or proxy server,
A storage unit that temporarily stores a copy of the content for at least part of the content held by a distribution server that distributes the content on the Internet;
A content list creation unit for creating a list of content stored in the storage unit;
A collection unit that collects the content list created by the content list creation unit and stored by the storage unit of the server and a content list stored by a server other than the server among the plurality of servers;
Using the information included in the content request message transmitted from the terminal via the mobile network and the content list collected by the collection unit, the server having the content requested by the terminal in the storage unit is determined. A discriminator to perform,
A securing unit that reads a file or stream of content requested from the terminal from the server determined by the determining unit to the own server through cooperation between servers;
A delivery unit for outputting the read file or stream according to a predetermined protocol;
A distribution network system characterized by comprising: As a result of the determination, if the server that accumulates the content requested from the terminal in the storage unit is its own server, the determination unit reads and distributes the storage unit and the distribution unit. Give instructions,
When another server accumulates the content requested from the terminal, the determination unit sends the URL (Uniform Resource Locator) of the content requested from the terminal and the other server to the securing unit. The IP address of the server and instructing the other server to secure the content, and the securing unit accumulates a copy of the requested content secured from the other server in the storage unit,
When neither the local server nor the other server has accumulated the content requested from the terminal, the determination unit sends the URL of the content requested from the terminal to the securing unit; Tell the IP address of the distribution server, issue an instruction to secure content from the distribution server, the securing unit accumulates a copy of the requested content secured from the distribution server in the storage unit, The distribution network system according to claim 1.   3. The distribution network system according to claim 1, wherein the content includes at least one of a moving image, a still image, audio, audio, software, an application, and data. The server
Serving GPRS (General Packet Radio Service) Support Node (SGSN),
Gateway GPRS support node (GGSN),
A node that combines a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN) into one;
Serving gateway (S-GW),
Packet data network gateway (P-GW),
A node that combines a serving gateway (S-GW) and a packet data network gateway (P-GW) into one;
The distribution server,
The distribution network system according to claim 1, wherein the distribution network system is connected to any one of the above. A server that is connected to each network node connected to the mobile network and functions as a cache server or a proxy server,
A storage unit that temporarily stores a copy of the content for at least part of the content held by a distribution server that distributes the content on the Internet;
A content list creation unit for creating a list of content stored in the storage unit;
A collection unit for collecting a content list stored in the local server and a content list stored in a server other than the local server;
A discriminating unit for discriminating a server having the content requested from the terminal using the information included in the content request message from the terminal and the content list collected by the collecting unit;
A securing unit that reads a file or stream of content requested from the terminal from the determined server by cooperation between servers;
A delivery unit for outputting the read file or stream according to a predetermined protocol;
A server characterized by comprising: As a result of the determination, if the server that accumulates the content requested from the terminal in the storage unit is its own server, the determination unit reads and distributes the storage unit and the distribution unit. Give instructions,
When another server accumulates the content requested from the terminal, the determination unit sends the URL (Uniform Resource Locator) of the content requested from the terminal and the other server to the securing unit. The IP address of the server and instructing the other server to secure the content, and the securing unit accumulates a copy of the requested content secured from the other server in the storage unit,
When neither the local server nor the other server has accumulated the content requested from the terminal, the determination unit sends the URL of the content requested from the terminal to the securing unit; Tell the IP address of the distribution server, issue an instruction to secure content from the distribution server, the securing unit accumulates a copy of the requested content secured from the distribution server in the storage unit, The server according to claim 5.   The server according to claim 5 or 6, wherein the content includes at least one of a moving image, a still image, sound, audio, software, an application, and data. The network node is
Serving GPRS (General Packet Radio Service) Support Node (SGSN),
Gateway GPRS support node (GGSN),
A node that combines a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN) into one;
Serving gateway (S-GW),
Packet data network gateway (P-GW),
A node that combines a serving gateway (S-GW) and a packet data network gateway (P-GW) into one;
The server according to any one of claims 5 to 7, including any one of the distribution servers. Multiple servers on the mobile network are provided, and the server functioning as a cache server or proxy server
With respect to at least a part of content held by a distribution server that distributes content on the Internet, a copy of the content is temporarily stored in a storage unit,
Create a list of contents stored on your server,
Collect the content list of the own server and the content list stored in a server other than the own server among the plurality of servers,
Using the information included in the content request message transmitted from the terminal and the content list, determine the server having the requested content,
From the determined server, the content file or stream requested from the terminal is read by cooperation between servers,
A delivery method, characterized in that the read file or stream is outputted and delivered by a predetermined protocol.   The distribution method according to claim 9, wherein the content includes at least one of a moving image, a still image, audio, audio, software, an application, and data.