KR101485610B1 - Distributed content delivery system based on network awareness and method thereof - Google Patents

Abstract

The present invention relates to a distributed content delivery system considering a network structure and a method thereof, and more particularly, to a distributed content delivery system and method using a client-server method and a peer-to- By controlling transmission of content to the optimal delivery path based on network information, terminal information, and content information, it is possible to prevent bottlenecks in the content server, shorten the content delivery path, The present invention provides a distributed content delivery system and a method thereof that are capable of providing a stable service quality and reducing a service provision cost by reducing the number of service providers.

To this end, the present invention provides a distributed content delivery system, comprising: a control server for setting a transmission path and controlling content transmission based on network information, terminal information, and content information; A content server for transmitting the content to the terminal under the control of the control server; And a network information server for collecting network information and terminal information in cooperation with other systems and transmitting the collected network information and terminal information to the control server.

 Content delivery, network information, terminal information, content information, transmission control information,

Description

[0001] DISTRIBUTED CONTENT DELIVERY SYSTEM BASED ON NETWORK AWARENESS AND METHOD THEREOF [0002]

The present invention relates to a distributed content delivery system and method for delivering content in a distributed processing manner in consideration of a network structure, and more particularly, to a distributed content delivery system for delivering an optimal delivery path based on network information, terminal information, and content information. And to transmit the content through the corresponding delivery path. The present invention also relates to a distributed content delivery system considering the network structure and a method thereof.

Generally, a content delivery method of a client-server structure requires building a delivery network to a large-capacity server (group), and the server and network construction costs increase as the number of users increases. In addition, the content delivery method of the client-server structure has a bottleneck in the server section due to an increase in the service usage, which degrades the service quality and it is difficult to cope with the surge of the instantaneous service usage.

Meanwhile, in the peer-to-peer content delivery method discussed above as an alternative to the client-server method, the terminal plays both the client and the server roles, . However, in the peer-to-peer content delivery method, service quality is dependent on the terminal and the content status, so that it is difficult for the service provider to control the service quality, and a large-scale commercial service Lt; / RTI >

A method for reducing service provision costs while complementing the disadvantages of the content delivery method of the client-server structure and the peer-to-peer content delivery method is a hybrid Hybrid) content delivery method. A hybrid method of delivering content uses a content delivery method of a peer-to-peer method and a method of delivering a content of a client-server structure, Quality can be guaranteed to some extent. Hereinafter, three conventional contents delivery methods of the hybrid method will be described as an example.

First, Korean Patent No. 10-648572 (Content Transmission Network System) is available. The conventional content transmission network system provides an improved type of content transmission network system that can accommodate increasing market demand without increasing the capacity and number of servers for providing content, And P2P (Peer-to-Peer) to accommodate an increasing amount of content demand, a client module for the content transmission network system, a content provider location information providing method, and a central control server.

In order to achieve the above object, the conventional content transmission network system includes a content server for providing content to a user terminal requesting a content download, a content server for checking the load status of the content server when a content is requested to be downloaded from the user terminal, A mediation server for providing the user terminal with IP information of the content server or the user terminal to which the content has been previously downloaded, and a mediation server for providing the IP information of the mediation server located close to the user terminal requesting the connection with the mediation server to the corresponding user terminal And a client module installed in the user terminal for requesting connection with the mediation server and requesting the mediation server having the IP provided in response to the request to download the content.

Next, Korean Patent No. 10-793642 (a super node terminal and a content transmission system using the same) is available. The content transmission system using the conventional super node can transmit a content using a super node to maximize the data transmission rate allowed in the external network connected to the subscriber network regardless of the increase in the content demand in the subscriber network. System, and further to provide a super node terminal capable of matching content with an original content server in order to maximize a data transmission rate allowed in an external network connected to a subscriber network, and a content transmission system using the super node terminal.

To this end, the conventional content transmission system using the super node may include at least one central management server which is located outside the subscriber network and provides information of a super node terminal to which a peer terminal requesting content transmission belongs, And transmits the content provider information in the subscriber's network, which is provided in the subscriber's network in response to a content transmission request from the peer terminal in the subscriber network, to the requesting peer terminal, Wherein the peer terminal is connectable to the central management server and the content server using the stored connection information, wherein when the content provider information is not transmitted from the super node, Server, And a client module for downloading the content requested by the content server and uploading the content downloaded from the content server to the super node.

Next, Korean Patent No. 10-802331 (a content transmission system and method using a user terminal) is known. In the conventional content transmission system using a user terminal, when a CDN service provider transmits content to each client, a terminal (specifically, a storage device) and a network resource in an idle state of each user are used The CDN service provider can reduce the cost burden of the CDN provider. Further, the content is distributed and stored to a plurality of users' terminals and network resources, and then transmitted to the respective clients. As a result, The present invention provides a content transmission system and method capable of gradually increasing a content transmission efficiency by inducing participation of a user by providing revenue to a user by paying a reward for use of a resource to each user, do.

To this end, in the conventional content transmission system using a user terminal, a plurality of contents divided and managed in blocks of a predetermined size are distributedly stored in a plurality of user terminals, and when a client requests transmission of the contents, A terminal information table storing information of each user terminal including IDs of contents stored in the respective user terminals; and a terminal information table generating unit for generating A list of all content that can be provided to each client, a list of contents downloaded by each client, and updates the ranking information according to learning data, which is priority information according to the transmission speed of the entire user terminal, system, A plurality of user terminals for transmitting and receiving the contents from the CDN provider system and storing the contents in block units for contents requested to be transmitted by each client and contents including IDs of contents to be downloaded from the CDN provider system And ranking information about the content to be downloaded, mapping each block constituting the content to be downloaded and each user terminal included in the ranking information according to the received ranking information, And a client for requesting and downloading a transmission of each block of the content to the user terminal.

However, in the conventional hybrid content delivery method including the above-described related art, it is a main object to reduce traffic of a server or a server section from the viewpoint of a content (service) provider, It is possible that the physical content delivery path becomes longer, the traffic is concentrated in a certain section, or the total amount of traffic added to the network increases, which may result in an increase in service provision costs and a decrease in service quality.

As described above, in the conventional technology as described above, when applied without considering network characteristics, there is a disadvantage in that a physical content delivery path is long, traffic is concentrated in a certain section, or the total amount of traffic added to the network increases, There is a problem that the service providing cost is increased and the service quality is deteriorated, and it is an object of the present invention to solve such a problem.

Accordingly, the present invention provides a distributed content delivery system considering a network structure for setting an optimal delivery path based on network information, terminal information, and content information, and transmitting the content through a corresponding delivery path, There is a purpose.

That is, the present invention uses a data transmission technology of a client-server method and a peer-to-peer method to distribute content transmission, and distributes network information, terminal information, and content information To prevent content bottlenecks, shorten the content delivery path, and reduce the burden on the network, thereby providing stable service quality and reducing service provisioning cost. The present invention has been made in view of the above problems, and it is an object of the present invention to provide a distributed content delivery system considering the network structure and a method thereof.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a distributed content delivery system including: a control server for setting a transmission path and controlling content transmission based on network information, terminal information, and content information; A content server for transmitting the content to the terminal under the control of the control server; And a network information server for collecting network information and terminal information and transmitting the collected information to the control server.

In addition, the terminal of the present invention requests content to the control server and transmits or receives content under the control of the control server.

According to another aspect of the present invention, there is provided a distributed content delivery method comprising: configuring network information, terminal information, and content information; And a transmission control step of searching for an effective content provider according to a content request from the terminal and transmitting the transmission control information to the terminal.

In addition, the method of the present invention further includes a content delivery step of delivering the content through a transmission path according to the transmission control information.

According to the present invention as described above, it is possible to efficiently transmit content through a shortest delivery path by setting an optimal delivery route based on network information, terminal information, and content information.

That is, the present invention uses a data transmission technology of a client-server method and a peer-to-peer method to distribute content transmission, and distributes network information, terminal information, and content information It is possible to prevent the bottleneck of the content server, to shorten the content delivery path to the shortest time, and to reduce the load on the network.

Therefore, by using the present invention, it is possible to reduce the cost of providing a media / content service and to provide a stable service quality.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a distributed content delivery system in consideration of a network structure according to the present invention; FIG.

As shown in FIG. 1, a distributed content delivery system considering a network structure according to the present invention includes a control server for setting an optimal transmission path based on network information, terminal information, and content information, A content server 20 for storing and managing the content source and transmitting the content to the terminal 40 under the control of the control server 10, A network information server 30 for managing the content and transmitting the content to the control server 10 and a content server 30 for requesting content to the control server 10 and transmitting the content according to the control of the control server 10 And a terminal 40 on which a distributed content transmission client for receiving or receiving the content is installed.

Here, the control server 10 includes network information including network structure and configuration information, location information of the terminal, terminal information including device information of the terminal, and content of the terminal and status information of the terminal Sets an optimal transmission path based on the content information, and controls the content to be transmitted through the set transmission path.

The content server 20 stores and manages a content source and transmits (distributes) the content requested from the terminal 40 to the corresponding terminal 40 under the control of the control server 10.

The network information server 30 collects and manages network information (network structure and configuration information) and terminal information in cooperation with a back-end system and transmits the network information and terminal information to the control server 10.

The client installed in the terminal 40 requests the content to the control server 10 and transmits the content to the other terminal according to the transmission control information from the control server 10 or transmits the content from the other terminal or the content server 20 .

2 is a detailed configuration diagram of an embodiment of the control server 10 of FIG.

2, the control server 10 includes network information for managing terminal information including network information including network structure and configuration information, location information of the terminal, and device information accommodated by the terminal, An information management unit 11, a content information management unit 12 for managing content information including terminal status information and terminal content information, transmission control information based on the network information, terminal information, A content transmission control unit 13 for controlling content transmission between the terminals or between the terminal and the content server using the content server, and a system interworking unit 14 for interworking with other servers or systems.

3 is a detailed configuration diagram of an embodiment of the content server 20 of FIG.

3, the content server 20 includes a content management unit 21 for storing and managing a content source, a content management unit 21 for managing content requested by the terminal 40 under the control of the control server 10, A content transmitting unit 22 for transmitting the content to the server 40, and a system interlocking unit 23 for interworking with another server or another system.

4 is a detailed configuration diagram of an embodiment of the network information server 30 of FIG.

As shown in FIG. 4, the network information server 30 interworks with other servers or other systems (e.g., a back-end system) to transmit network information including a network structure and configuration information, A system interworking unit 33 for collecting and transmitting the terminal information including the received device information to the control server 10, a network information management unit 31 for managing network information collected by the system interworking unit 33, And a terminal information management unit 32 for managing the terminal information collected by the system interlocking unit 33.

FIG. 5 is a block diagram of an embodiment of a distributed content transmission client installed in the terminal 40 of FIG.

As shown in FIG. 5, the distributed content transmission client installed in the terminal 40 is a peer (terminal) of the distributed type according to the transmission control information from the control server 10 as a peer A content receiving unit 42 for receiving content from another peer or the content server 20 according to transmission control information from the control server 10, And a server interlocking unit 43 for interlocking with the control server 10.

The operation of the distributed content delivery system considering the network structure according to the present invention having the above-described configuration will now be described.

FIG. 6 is a flowchart illustrating a distributed content delivery method according to an exemplary embodiment of the present invention. Referring to FIG.

First, network information is configured and managed (100). That is, the network information is configured and managed by reflecting the network structure and the configuration information.

Then, the terminal information is configured and managed (200). That is, the terminal information is configured and managed by reflecting the location information of the terminal and the device information accommodated by the terminal.

The control server 10 logically clusters the terminal 40 according to the network configuration and constructs the network information for control through the processes of " 100 "and" 200 "

And configures and manages the content information (300). That is, the system compiles and manages basic content information for providing content by combining the content description held by each terminal and the status information of the terminal.

When an arbitrary terminal 40 requests content to the control server 10 in operation 400, the control server 10 searches for a valid content provider (terminal) and transmits the transmission control information to the terminal (operation 500). That is, when the control server 10 receives a request for content from an arbitrary terminal (400), it searches for a valid content provider (terminal) and determines and transmits transmission control information to the terminal (500).

The content is transmitted and received between the terminals or between the terminal and the content server (600).

The content is transmitted through the optimal path through each of the above processes (100 to 600).

Next, a process 100 for configuring and managing network information will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 is a detailed flowchart of an embodiment of a process 100 for configuring and managing network information of FIG. 6, and FIG. 8 is a diagram illustrating an example of a content distribution tree according to the present invention.

First, the network information management unit 31 of the network information server 30 collects network information such as network device configuration information, inter-device link configuration information, and link distance information in cooperation with the back-end system (110).

Next, the network information server 30 transmits the collected network information to the control server 10 (120).

Then, the control server 10 receives and stores network information 130 and generates content distribution tree information for each content distribution group 140 (140).

Here, when generating the content distribution tree information, the entire network is divided into groups for sharing content, and content distribution tree information is generated for each group. As shown in FIG. 8, a network device is determined as a node of a content distribution tree, and a physical link between each node is defined as a link of a content distribution tree to generate logical content distribution tree information. At this time, the content distribution tree information is generated by assigning a logical number to each node according to the hierarchy from the root (start) to the leaf (end) and including the distance information per link. In the process of configuring the network information, the leaf node of the content distribution tree is a device that accommodates the terminal 40.

Next, a process 200 for configuring and managing terminal information will be described with reference to FIG.

FIG. 9 is a detailed flowchart of a process 200 for configuring and managing the terminal information of FIG.

First, the terminal information management unit 32 of the network information server 30 collects terminal information such as device information and terminal location information of the terminal in cooperation with the back-end system (210).

Next, the network information server 30 transmits the collected terminal information to the control server 10 (220).

Then, the control server 10 receives and stores the terminal information (230). Then, the terminal groups are clustered (240). That is, the set of terminals accommodated by the leaf node of the content distribution tree generated in the process 100 of configuring and managing network information reflecting the terminal acceptance information is designated as one cluster, and the corresponding node is called a child node of the corresponding leaf node The content distribution tree is expanded and configured (240).

At this time, the ID of each cluster is composed of a combination of logical numbers of nodes. Referring to FIG. 8, for example, the cluster ID of the leftmost cluster is "111 ".

Meanwhile, for efficient content delivery, the control server 10 monitors the content description information held by the terminal 40 and the status information of the terminal in cooperation with the terminal. The client of the terminal transmits to the control server 10 the information necessary for transmission control such as the content description information of the terminal and the status information of the terminal. The process 300 for configuring and managing the content information will be described with reference to FIG.

FIG. 10 is a detailed flowchart of an embodiment of a process 300 for configuring and managing the content information of FIG.

First, when the terminal (client) becomes active, the server interworking unit 43 of the client installed in the terminal 40 transmits the content description information of the terminal and the status information of the terminal to the control server 10 (310).

Thereafter, the terminal (client) downloads the new content and transmits the new content description information to the control server 10 when the retained content is changed (320).

In addition, when the terminal (client) participates in the content transmission and the transmission status is changed, the terminal (client) transmits the status information to the control server 10 (330).

Then, the content information management unit 12 of the control server 10 receives and stores the content description information and the status information transmitted by the terminal (340).

Next, the control server 10 constructs or updates the content information by reflecting the content description information of the terminal and the status information of the terminal (350).

Through the processes 100 to 300, the content distribution tree information is configured based on the network information and the terminal information, and the content information is configured, thereby completing the information configuration process for controlling the content transmission.

Next, a process 400 and 500 for the control server 10 to provide the transmission control information considering the optimal path when requesting the content from the terminal 40 will be described with reference to FIG.

FIG. 11 is a detailed flowchart illustrating an exemplary process 400 and 500 for transmitting transmission control information in response to a content request process and a response to the content request process of FIG.

First, the server interworking unit 43 of the terminal (client) requests content to the control server 10 (410).

Then, the content transmission control unit 13 of the control server 10 searches for a valid peer having an optimal transmission path in consideration of the network information, the terminal information, and the content information (510).

Next, the control server 10 transmits content transmission control information including an IP address, a port number, and a content description of a valid peer to the content request terminal 40 (520).

Then, the terminal (client) receives the content transmission control information (420) and uses it for the subsequent content transmission / reception process (600).

Next, a process 510 for searching for a valid peer having an optimal transmission path will be described in detail with reference to FIG. 12 and FIG.

FIG. 12 is a detailed flowchart of an operation 510 for searching for a valid peer having an optimal transmission path in FIG.

First, the content transmission control unit 13 of the control server 10 sets a content request node (a terminal requesting content) as a search reference node and sets a content request cluster (a cluster to which the terminal requesting the content belongs) (5111), a valid peer is searched for in the search target cluster (5112).

When the search result 5112 and the valid peer are satisfied, if the valid peer is not satisfied, the parent node of the search reference node (content request cluster) is set as the search reference node, The cluster to which the sibling node belongs is set as the search target cluster (5114).

Thereafter, when there are a plurality of search target clusters, the search order of the search target clusters is sorted according to the transmission distance order (5115). That is, when there are a plurality of search target clusters, the transmission cost (Cost) of the link between the parent node of the content request cluster and the parent node of the search target cluster is calculated using the network information configured in the process of "100 & Sort search order of search target cluster.

Thereafter, a valid peer is searched for each search target cluster according to the sorted search order (5116).

Thereafter, the search nodes are incremented by one level until the effective peer is searched, and the effective peers are searched by repeating the steps 5114 to 5117. However, the valid peer search is limited to the content distribution group (5118). That is, the parent node of the search reference node can be raised to the maximum root node.

Referring to FIG. 8, the process from the step 5111 to the step 5118 will be described. When the content request terminal belongs to the cluster 111, the control server 10 searches for a valid peer in the cluster 111 first. Next, the node 1 on the left side of the third rank, which is the parent node of the cluster 111, becomes the search reference node, and in the cluster 112 belonging to the node 2 on the left side of the third rank, which is the sibling node of the search reference node, ). Next, the node 1 on the left side of the second rank becomes the search reference node, and searches the effective peers in the clusters 121 and 122 belonging to the sibling node of the search reference node. Through the above process, an effective peer to provide the content to the content request terminal is determined.

On the other hand, if a valid peer is not found in the terminal, the content server is set as a valid peer (5119).

Next, a detailed process of searching for a valid peer with respect to the cluster to be searched will be described in detail with reference to FIG.

FIG. 13 is a detailed flowchart of a process of searching for and determining a valid peer for a terminal in a search target cluster of FIG. 12.

First, a peer having valid content is searched for a terminal belonging to a search target cluster using terminal information and content information managed by the control server 10 (5120, 5121).

Then, it is determined whether the corresponding peer can transmit the content based on the transmission status information of the peer having the valid content (5122).

Then, a peer that retains the valid content and is capable of transmitting the content is added to the candidate peer list (5123).

After the search for the cluster to be searched (Cluster) is completed, the transmission cost of the candidate peers is added to the list of effective peers (5124 to 5126) until the valid peers are satisfied. However, the transmission cost of the peer is the transmission cost of the link between the peer node and the lowest network equipment node on the distribution tree.

On the other hand, when the control server 10 determines the content transmission control information and transmits the content transmission control information to the terminal 40 and there is an active peer inactive state in which the content can not be received from the valid peer, 40 transmits the deactivated peer information to the control server 10 and the control server 10 performs the process of searching for a valid peer again to update the content transmission control information, 40) so that the content transmission is normally performed. This process will be described in detail with reference to FIG.

FIG. 14 is a detailed flowchart of an exemplary procedure for searching for a new valid peer and updating transmission control information when a valid peer is inactivated.

The server interlocking unit 43 of the content request terminal 40 transmits the inactive peer information such as the IP address of the valid peer inactivated by the content transmission control unit 13 of the control server 10, (430).

Then, the content transmission control unit 13 of the control server 10 searches for a new effective peer (530) by performing the processes described above with reference to FIGS. 12 and 13 on the content related to the inactive peer.

Next, the content transmission control unit 13 of the control server 10 transmits the updated content transmission control information to the server interface unit 43 of the content request terminal 40 (540).

Then, the terminal 40 receives the transmission control information from the control server 10 (440) and updates the content transmission control information by reflecting the received transmission control information (450).

Next, a process 600 for transmitting peer-to-peer content based on the transmission control information of the control server 10 will be described with reference to FIG.

FIG. 15 is a detailed flowchart of an operation 600 of transmitting / receiving inter-terminal contents based on the transmission control information of FIG.

First, the content receiving unit 42 of the content requesting terminal 40 requests content transmission to an effective peer to transmit the content based on the content transmission control information transmitted from the control server 10 (610).

Then, the content transmitter of the valid peer transmits the content to the content request terminal 40 (620).

Then, the content receiver 42 of the content request terminal 40 receives and stores the content (630).

Then, the terminal 40 participating in the transmission transmits the content description information of the terminal and the transmission status information of the terminal to the control server 10 as described above.

FIG. 16 is a detailed flowchart of a process 600 of transmitting / receiving content between the content server and the terminal of FIG. 6, in which the content server is designated as a valid peer due to insufficient effective peers in the terminal. FIG. 6 illustrates a process 600 of transmitting content between a content requesting terminal and a content server.

First, the content receiving unit 42 of the content requesting terminal 40 requests content transmission to the content server 20 based on the content transmission control information received from the control server 10 (640).

Then, the content transmission unit 22 of the content server 20 transmits the content to the content request terminal 40 (650).

Then, the content receiver 42 of the content request terminal 40 receives and stores the content (660).

Then, the terminal 40 participating in the transmission transmits the content description information of the terminal and the transmission status information of the terminal to the control server 10 as described above.

That is, when transmission / reception of the content occurs, information is exchanged between the terminal 40 participating in transmission and the control server 10 and the content information is updated as in the process of configuring and managing the content information of FIG. The server interworking unit of the terminal that transmits the content transmits the change information of the transmission state to the content information management unit 12 of the control server 10 along with the start of content transmission and the terminal 40 receiving the content receives the change information of the reception state To the content information management unit 12 of the control server 10. The reception terminal 40 also transmits the changed content list information to the content information management unit 12 of the control server 10 when the reception of the content is completed. Then, the control server 10 updates and manages the content information by reflecting the content description information and the status information transmitted from the terminal 40.

Meanwhile, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily deduced by a computer programmer in the field. In addition, the created program is stored in a computer-readable recording medium (information storage medium), and is read and executed by a computer to implement the method of the present invention. And the recording medium includes all types of recording media readable by a computer.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

The present invention can be applied to the construction of a delivery network for providing media and content services.

FIG. 1 is an overall configuration diagram of an embodiment of a distributed content delivery system considering a network structure according to the present invention.

FIG. 2 is a detailed configuration diagram of an embodiment of the control server of FIG. 1;

FIG. 3 is a detailed configuration diagram of an embodiment of the content server of FIG. 1;

FIG. 4 is a detailed configuration diagram of an embodiment of the network information server of FIG. 1;

FIG. 5 is a configuration diagram of an embodiment of a distributed content transmission client installed in the terminal of FIG. 1;

FIG. 6 is a flowchart of an embodiment of a distributed content delivery method considering a network structure according to the present invention.

FIG. 7 is a detailed flowchart of an embodiment of a process of configuring and managing network information of FIG. 6;

Figure 8 is an example showing a content distribution tree according to the present invention,

FIG. 9 is a detailed flowchart of an embodiment of a process of configuring and managing the terminal information of FIG. 6;

FIG. 10 is a detailed flowchart of an embodiment of a process of configuring and managing the content information of FIG. 6;

FIG. 11 is a detailed flowchart of an embodiment of a process for transmitting transmission control information in the content request process and the response to the content request process of FIG. 6;

FIG. 12 is a detailed flowchart of an embodiment of a process of searching for a valid peer having an optimal transmission path of FIG. 11;

FIG. 13 is a detailed flowchart of a process of searching for and determining a valid peer for a terminal in a search target cluster of FIG. 12,

14 is a detailed flowchart of an embodiment of a process of searching for a new valid peer and updating transmission control information when a valid peer is inactivated,

FIG. 15 is a detailed flowchart of an embodiment of a process of transmitting / receiving content between terminals based on the transmission control information of FIG. 6;

FIG. 16 is a detailed flowchart of a process of transmitting / receiving content between the content server and the terminal of FIG. 6;

DESCRIPTION OF THE REFERENCE NUMERALS

10: control server 20: content server

30: Network information server

40: terminal equipped with a distributed content transmission client

Claims (17)

A distributed content delivery system, A control server for setting a transmission path and controlling content transmission based on network information, terminal information, and content information; A content server for transmitting the content to the terminal under the control of the control server; And A network information server for collecting network information and terminal information and transmitting the collected information to the control server The content delivery system comprising: The method according to claim 1, Wherein the control server comprises: A network information and a terminal information management unit for managing network information including network structure and configuration information, and terminal information including location information of the terminal and device information accommodated by the terminal; A content information management unit for managing content information including status information of the terminal and content description information of the terminal; A content transmission control unit for controlling transmission of content between the terminals or between the terminal and the content server using the network information, the network information and the terminal information of the terminal information management unit, and the transmission control information reflecting the content information of the content information management unit, ; And The first system interlocking part The content delivery system comprising: 3. The method of claim 2, The content transmission control unit, A valid peer is searched in consideration of the network information and the terminal information of the terminal information manager and the content information of the content information manager according to a content request from the terminal, To the terminal, transmission control information including information on the transmission control information. The method of claim 3, The validity peer searching process in the content transmission control section may include: Setting a content request node as a search reference node, setting a content request cluster as a search target cluster, searching for a valid peer in the search target cluster, Arranging a plurality of new search target clusters in order of transmission distance after setting a parent node of the search reference node as a new search reference node, setting a cluster to which a sibling node of the search reference node belongs as a new search target cluster, Searching for a valid peer in the new search target cluster according to the sorted order, Searches for a valid peer while raising the search reference node by one level until a valid peer is found, And sets the content server to a valid peer if a valid peer is not found. The method of claim 3, The content server comprises: A content management unit for storing and managing a content source (source); A content transmitting unit for transmitting the content requested by the terminal to the terminal under the control of the control server; And The second system interlocking part The content delivery system comprising: 6. The method of claim 5, The network information server comprises: A third system interworking unit for collecting network information including network structure and configuration information, terminal information including location information of the terminal and device information accommodated by the terminal, and transmitting the collected terminal information to the control server; A network information management unit for managing network information collected by the third system interworking unit; And A terminal information managing unit for managing terminal information collected by the third system interworking unit, The content delivery system comprising: 7. The method according to any one of claims 1 to 6, The terminal, Request content to the control server and transmit or receive content under the control of the control server. 8. The method of claim 7, The terminal, A content transmission unit for transmitting the content to another peer according to transmission control information from the control server; A content receiver for receiving content from another peer or the content server according to transmission control information from the control server; And A server interlocking unit for interlocking with the control server, The content delivery system comprising: A distributed content delivery method, An information configuration step of configuring network information, terminal information, and content information; And A transmission control step of searching for a valid content provider according to a content request from the terminal and transmitting transmission control information to the terminal Gt; a < / RTI > distributed content delivery method. 10. The method of claim 9, A content delivery step of delivering the content through the transmission path according to the transmission control information The method further comprising: 11. The method according to claim 9 or 10, Wherein the transmission control step comprises: An effective peer search process for searching a valid peer in consideration of network information, terminal information, and content information according to a content request from the terminal; And Transmitting transmission control information including information on the searched valid peer to the terminal / RTI > 12. The method of claim 11, The valid peer search process includes: Setting a content request node as a search reference node, setting a content request cluster as a search target cluster, and searching for a valid peer in the search target cluster; Setting a parent node of the search reference node as a new search reference node, setting a cluster to which a sibling node of the search reference node belongs as a new search target cluster, and arranging a plurality of the new search target clusters in order of transmission distance ; Searching for a valid peer in the new search target cluster according to the sorted order; Searching for a valid peer by raising the search reference node by one level until a valid peer is searched; And The process of setting the content server as a valid peer if no valid peer is found. / RTI > 13. The method of claim 12, The searching of a valid peer in the search target cluster includes: Searching for a peer having an effective content for a terminal belonging to the search target cluster using terminal information and content information; Determining whether the content can be transmitted based on the transmission status information of the peer having the valid content; Adding a peer having valid content and capable of transmitting content to a candidate peer list; And Adding the candidate peers to the effective peer list in the descending order of the transmission cost of the candidate peers after completion of the search for the search target cluster / RTI > 12. The method of claim 11, The information configuration step includes: A network information configuration step of configuring and managing network information by reflecting network structure and configuration information; A terminal information configuration step of configuring and managing terminal information by reflecting the location information of the terminal and the device information accommodated by the terminal; And A content information configuration step of configuring and managing content information by combining the content description information held by the terminal and the status information of the terminal; Gt; a < / RTI > distributed content delivery method. 15. The method of claim 14, The network information configuration step includes: Collecting and transmitting network information such as network device configuration information, inter-device link configuration information, and link distance information in cooperation with a back-end system in a network information server; Receiving the transmitted network information and storing the received network information; And The control server generates content distribution tree information for each content distribution group / RTI > 16. The method of claim 15, The terminal information configuration step may include: The network information server collecting and transmitting terminal information such as device information and location information of the terminal in cooperation with the backend system; The control server receiving and storing the transmitted terminal information; And A set of the terminals accommodated by the leaf node of the generated content distribution tree is designated as one cluster by reflecting the received terminal information and the content distribution tree is expanded by adding the terminal as a child node of the corresponding leaf node The process of composition / RTI > 17. The method of claim 16, Wherein the step of configuring the content information comprises: Receiving, by the control server, content description information and status information transmitted by the terminal in an active state; The control server receiving and storing new content description information transmitted by the terminal according to the content description change; Receiving, by the control server, status information transmitted by the terminal according to a transmission status change; And The control server configures or updates the content information by reflecting the content description information of the terminal and the status information of the terminal / RTI >

Images