KR101137249B1 - System and method for contents delivery based on multiple Content Delivery Network providers, and content server thereof - Google Patents

Abstract

The present invention relates to a system and method for content distribution through a plurality of CDN providers, and a content server thereof, wherein the content server transmits and stores an object included in a page to one or more replication servers of a plurality of CDN providers. When the server receives a content request from a client, the CDN provider is selected from among a plurality of CDN providers, and the object storage location URL of the selected CDN provider is rewritten on the page and sent to the client to transfer the object from the CDN provider's replication server. It includes a process to receive the transmission, through which, no additional delay time occurs in the middle mile interval, it is possible to increase the reliability of the content delivery by eliminating the need for interoperation between CDN providers.

CDN, routing, redirection, object URL, rewriting

Description

System and method for contents delivery based on multiple Content Delivery Network providers, and content server

The present invention relates to a content distribution system and method through a content delivery network (CDN) provider, and a content server thereof. In particular, a content server receiving a content request from a client may provide an object included in a page among a plurality of CDN providers. The present invention relates to a content distribution system and method through a plurality of CDN providers for selecting a CDN service provider, rewriting an object URL on a page, and transmitting the object URL to the client so that the client receives the object.

In general, the number of contents (eg, videos, music, files, etc.) that a content provider (CP) provides to a client is very large. There is a heavy load for a web server to provide some or all of these to each of the multiple clients one-to-one. This is because a web server is connected to a single Internet Service Provider (ISP), whereas clients requesting content exist in multiple ISPs.

Therefore, traffic between ISPs increases exponentially as the number of content providers and clients increases, and transmission delay and / or transmission failure rate due to traffic congestion increases. In the worst case, the web server may fail over.

The CDN (Content Delivery Network) has been introduced to overcome this problem. A CDN is a collection of content that is concentrated on a content provider's web server that is remote from clients, such as pictures, banners, video, or audio. Point-of-presence is stored in the host server which is widely distributed, and the client connects to the host server through the returned path by returning the path of the host server closest to the user when requested by the client. This service allows you to receive content. The host server is variously referred to as a cache server, a replication server, or a ghost server.

However, it would be expensive and time-consuming to install and operate a replica server that would allow a single CDN service provider to serve all regions of the world. To this end, content internetworking technology has been discussed.

Content interworking technology is a technology that enables CDN operators to interwork with each other, also referred to as 'content peering' technology. Content interworking technology is a technology used by a CDN provider when it cannot cover the global network with sufficient penetration depth and is a technology required to expand its content distribution area.

For details on content interoperability techniques, see Internet draft- "content internetworking architectural overview", "distribution requirements for content internetworking", "content distribution internetworking (CDI) AAA requirements" and RFC3570 "content distribution internetworking (CDI) scenarios", And standard documents.

Also, R. Buyya, AMK Pathan, J. Broberg, and Z. Tari, "A Case for Peering of Content Delivery Networks," IEEE Distributed Systems Online, Vol. . 7, No. 10, IEEE CS Press, Los Alamitos, CA, USA, October 2006, and discusses content interoperability technologies and systems that have been discussed from the past to the present.

The standard documents and references disclose the contents of CDN service providers in providing services to clients, and introduce a virtual organization model for redirection, distribution, and accounting. Is proposing.

According to these contents, previously discussed techniques are as follows. When a client in a specific region requests specific content to the content provider, the content request is redirected to the CDN provider contracted with the content provider, and the CDN provider selects a CDN provider that is geographically close to the client among other CDN providers that are interoperable with the content. Select to redirect the content request and respond to the client's request.

This conventional method has the following problems.

Regardless of the location of the client requesting the content first, it is routed to the CDN provider contracted with the content provider, and then to the CDN provider closest to the client, thereby providing latency (RRT) in the middle mile section of the Internet. : Round Trip Time occurs.

Secondly, if the client's request is not properly responded during the interworking, the customer may have difficulty in identifying the responsibility for the inconvenience.

There is a need for a method for improving the above problems.

The present invention has been proposed to solve the above-described problems, by selecting a specific CDN provider to provide an object included in the page transmitted to the client of the plurality of CDN providers in the content server receiving the content request from the client, By rewriting the object storage location URL of the selected CDN service provider to the page and transmitting the rewritten page to the client, the content through the plurality of CDN service providers to receive the objects included in the page in the replication server of the selected CDN service provider. Its purpose is to provide a distribution system and method, and a content server thereof.

Content distribution method through a plurality of CDN operators of the present invention for achieving the above object, the storage step of receiving and storing the object contained in the page from the content server from one or more replication server of the plurality of CDN operators, from the client The content server, which has requested the page, selects a CDN provider to transmit the object among the plurality of CDN providers by referring to the location of the client, and stores the object storage location URL of the selected CDN provider in the object information on the page. A page transfer step of rewriting and transmitting the rewritten page to the client; and from the local name server of the client receiving the page, the URL corresponding to the URL having received the IP address query of the replication server storing the object. At least one replica server in the provider name server Send the object via the local name server, the IP address of a particular replica server includes a transmission step of transmitting the object to the client.

In the content distribution method through a plurality of CDN providers of the present invention, the page transmission step, characterized in that the content server refers to the location of the client using the IP address information of the client.

In the content distribution method through a plurality of CDN providers of the present invention, the page transmission step, the content server is one or more information of the service area information of the plurality of CDN providers and object information serviced by the plurality of CDN providers. The CDN service provider for transmitting the object may be selected with reference to the global network map.

In the content distribution method through a plurality of CDN providers of the present invention, the object transmission step, the data traffic information of the at least one replication server in the provider name server, local proximity information between the at least one replication server and the client and the one The IP address of the specific replication server is transmitted to the local name server in consideration of at least one piece of object information stored in each of the above replication servers.

Content distribution system through a plurality of CDN providers of the present invention for achieving the above object, and stores one or more replication server, the page and the object of a plurality of CDN providers to receive and store the objects contained in the page and And transmitting the object to the one or more replication servers, and upon receiving the page request from a client, selecting a CDN provider to transmit the object among the plurality of CDN providers by referring to the location of the client, and selecting the object information in the page. A content server for rewriting the object storage location URL of the selected CDN provider to transmit the rewritten page to the client, and a replica server storing the object from a local name server on the client side receiving the page. Receiving an IP address query to the one or more replication server And an operator name server corresponding to the URL for transmitting the IP address of the specific replication server to which the object is to be transmitted to the client via the local name server.

In the content distribution system through a plurality of CDN providers of the present invention, the content server is characterized by referring to the location of the client using the IP address information of the client.

In a content distribution system through a plurality of CDN providers of the present invention, the content server may include a global network map including at least one of service area information of the plurality of CDN providers and object information serviced by the plurality of CDN providers. By reference, the CDN provider for transmitting the object is selected.

In the content distribution system through a plurality of CDN providers of the present invention, the service provider name server, the data traffic information of the one or more replication server, local proximity information between the one or more replication server and the client and each of the one or more replication server The IP address of the specific replication server is transmitted to the local name server in consideration of one or more pieces of stored object information.

Content server of the present invention for achieving the above object, the transmission and reception unit for transmitting and receiving data, the content database storing the page and the objects contained in the page, service area information of a plurality of CDN operators and the plurality of CDN providers A global network map database storing one or more information of the object information serviced by the service provider, and transmitting and storing the object to one or more replication servers of the plurality of CDN operators through the transceiver unit, and transmitting the object to the client through the transceiver unit. When a page is requested, a CDN service provider to transmit the object is selected among the plurality of CDN service providers by referring to the location of the client and the information stored in the global network map database, and is displayed on the object information in the page stored in the content database. And a controller for rewriting the object storage location URL of a predetermined CDN provider and transmitting the rewritten page to the client through the transceiver.

In the content server of the present invention, the control unit may refer to the location of the client using IP address information of the client.

In the content server of the present invention, the global network map database further includes IP address information corresponding to service areas of the plurality of CDN service providers.

In the content server of the present invention, the control unit may further select the CDN service provider to which the object is to be transmitted by referring to the IP address information.

In the content server of the present invention, the global network map database may further include storage location URL information of each of the plurality of CDN service providers.

In the content server of the present invention, the control unit rewrites the object storage location URL of the selected CDN service provider with reference to the object storage location URL information of each of the plurality of CDN service providers included in the global network map database. It is characterized by.

According to the present invention, by allowing the content server to select the most appropriate CDN provider to respond to the client's object request and receive the object, no additional delay time occurs in the middle mile interval, and interoperability between CDN providers is achieved. This eliminates the need to increase the reliability of content delivery.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings.

1 is a block diagram of a content distribution system through a plurality of CDN operators according to an embodiment of the present invention. Referring to FIG. 1, the content distribution system according to the present embodiment includes a client 110, a local name server 120, a replication server 130, a business name server 140, a content provider name server 150, and a content server ( 160 and network 170.

The client 110 refers to equipment such as a computer that receives information from a server connected to the network 170. The client 110 includes a browser and a resolver. When a URL (Uniform Resource Locater) for requesting specific content is input to the browser of the client 110, a resolver connected to the browser accesses a local name server 120 that is registered in advance. It converts the name into an Internet Protocol (IP) address of the content server 160 providing the corresponding content.

In the present invention, when the client 110 receives a page from the content server 160 using the IP address of the content server 160, parsing it and using the URL of the object included in the found page, the local name. The server 120 queries the IP address of the replica server 130 that will provide the object. Thereafter, when receiving the IP address of the replication server 130 from the local name server 120 to receive the object using this.

The local name server 120 refers to a DNS (Domain Name Server) for converting a domain name into an IP address, and converts a symbolic name into a numeric address used by a machine to inform the name server. It is a kind. The local name server 120 receiving the domain name information of the content server 160 from the resolver of the client 110 receives the IP (Internet Protocol) address of the content server 160 corresponding to the domain name. Return).

In addition, when the local name server 120 receives the IP address of the replication server 130 storing the object included in the page from the client 110, the local name server 120 queries the IP address of the replication server 130 to the operator name server 140. Receive and transmit to the client 110.

The replication server 130 is also called a cache server, for example, and stores a copy of an object stored and managed by the content server 160 to quickly provide a request from the client 110. Play a role.

The business name server 140 has IP address information of the replication server 130. When the provider name server 140 receives the IP address of the replication server 130 to transmit the object from the local name server 120, the operator name server 140 selects an appropriate replication server 130 to respond to the object request, and selects the corresponding replication server 130. The IP address is transmitted to the client 110 via the local name server 120.

In this case, the selection of the replication server 130 includes data traffic information of one or more replication servers including the replication server 130, local proximity information between the client 110 and one or more replication servers including the replication server 130, and the replication server ( One or more replication servers, including 130) are made in consideration of one or more pieces of object information stored in each.

The content server 160 stores a web page provided by a content provider and an embedded object included in the page, and transmits the web page to the client 110 when a content request is received from the client 110. A server that plays a role.

The content provider of the present invention makes a contract with a plurality of CDN providers and transmits and stores an object included in a page from the content server 160 to a replication server held by each CDN provider. When the content server 160 receives a content request from the client 110, the content server 160 selects a CDN service provider to transmit the objects included in the requested page among the plurality of CDN service providers, and stores the object of the CDN service provider selected in the object information in the page. After rewriting the URL, the rewritten page is transmitted to the client 110. This is to allow the client 110, which parses the page and finds the URL of the included object, to receive the object included in the page from the selected CDN service provider's replication server 130.

At this time, the content server 160 checks the location of the client 110 in consideration of, for example, the IP address of the client 110. In addition, a specific CDN provider is selected to provide an object to the client 110 by referring to a global network map including service area information of a plurality of CDN providers contracted with a content provider. For example, the global network map may store contents of service area information of each CDN service provider, content information stored in the replication server 130 of each CDN service provider, and the like.

The content provider name server 150 is a kind of name server, and when the IP address of the content server 160 is queried from the local name server 120 on the client 110 side, the content provider name server 150 transmits the IP address to the local name server 120. Do it.

The network 170 transmits data and exchanges information between the client 110, the local name server 120, the replication server 130, the operator name server 140, the content provider name server 150, and the content server 160. Means a data communication network.

The configuration and operation of the content server 160 according to an embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a block diagram of the content server 160 shown in FIG. 1 according to an embodiment of the present invention. 1 and 2, the content server 160 according to the present exemplary embodiment includes a transceiver 210, a controller 220, a global network map database 230, and a content database 240.

The transceiver 210 has an interface for data transmission, message transmission and the like through the network 170.

The global network map database 230 includes service area information of a plurality of CDN providers contracted by a content provider, storage object information serviced by each CDN service provider, storage location URL information of objects stored by each CDN service provider, and each service area. A repository of global network map information including one or more of IP address information of a corresponding client.

The content database 240 is a page and a repository of objects contained in the page.

When the controller 220 receives the content request from the client 110 through the transceiver 210, the controller 220 determines the location of the client 110. The location of the client 110 is checked by checking the IP address of the client 110.

The controller 220 may refer to the identified location of the client 110 and the global network map information stored in the global network map database 230 to transmit a specific CDN to the client 110 to transmit an object included in a page among the plurality of CDN providers. Select a business operator. Thereafter, the controller 220 rewrites the URL indicating the corresponding object storage location of the selected CDN operator to the object information in the page, and transmits the rewritten page to the client 110 through the transceiver 210.

Information of the global network map included in the global network map database 230 will be described in more detail with reference to FIG. 3.

3 is an example of global network map 300 information stored in the global network map database shown in FIG. 2 of the present invention. The global network map 300 is map information referred to by the content server 160 in the process of selecting a CDN service provider to respond to the object request of the client 110.

Referring to FIG. 3, the global network map 300 of the present embodiment includes continent information 310, country information 320, region information 330, CDN business information 340, storage object information 350, and object URL. 360 and a column of IP addresses 370.

The continental information 310 item is a field containing information of each continent of the world.

The country information 320 item is a field containing country information included in each continent.

The area information 330 item is a field containing detailed area information included in each country.

The CDN provider information 340 item is a field containing CDN provider information including a replication server 130 that can provide CDN service to each region.

The storage object information 350 item is a field containing content information stored in a replication server of a CDN service provider providing a CDN service in each region.

The object URL 360 item is a field containing object URL information indicating a location where each CDN service provider stores an object.

The IP address 370 item is a field containing IP address information of a terminal and the like located in each region of the region information 330.

Referring to the global network map 300, the country information 320 corresponding to the North American continent in the continental information 310 item includes a country such as the United States, Canada, .... In addition, it can be seen that the New York, California, ... etc. belong to the regional information 330 corresponding to the item of the national information 320 of the United States. In addition, the provider of the CDN provider information 340 corresponding to the New York state of the area information 330 is 'XXX', which is a provider that provides services to the New York State among the providers of CDN services for the content provider's contents. Indicates that it is 'XXX'. And referring to the storage object information 350, it can be seen that the content stored in the replica server 130 of the 'XXX' operators that provide the CDN service to New York State is 'AAA', 'BBB'.

Referring to the corresponding object URL 360 item, the URL of the location where the contents of 'AAA' and 'BBB' owned by the 'XXX' operator is stored is 'xxx.xxx.xxx/xxx'. In addition, referring to the IP address 370, the IP address of the terminal located in the state of New York is 'X.X.X'. In this case, 'X.X.X' represents one or more pieces of IP address information, and another IP address of the IP address 370 item also includes one or more pieces of IP address information.

If a client 110 located in New York State requests a page, the content server 160 that receives the page determines the location of the client 110 using the IP address of the client 110, and maps the global network. The IP address 370 of 300 retrieves an IP address that matches the IP address of the client 110.

The region corresponding to the corresponding IP address is searched by referring to the continental information 310, the country information 320, and the region information 330, and the CDN service provider 340 provides CDN service information that provides a service to the searched area. Search in the item.

Thereafter, the content held by the searched CDN service provider is searched in the storage object information 350 item, and if there is an object that matches the object included in the page requested by the client 110, the URL corresponding to the searched object is returned. By searching in the item, the object information of the requested page is rewritten, and the rewritten page is transmitted to the client 110. On the contrary, if there is no content that matches the object included in the page, the CDN provider that provides the service to another neighboring region stores the object, and selects the CDN provider and rewrites the object URL to the page. To 110.

Since other information included in the global network map 300 also contains the above information, a detailed description thereof will be omitted.

A content distribution process through a plurality of CDN providers according to an embodiment of the present invention will be described in more detail with reference to FIG. 4.

4 is a flowchart illustrating a content distribution method through a plurality of CDN providers according to an embodiment of the present invention. Referring to FIG. 4, the content server 160 transmits and stores an object included in the page of the content provider to the replication server 130 (S400). Content transmission in step S400, for example, when there is a request from the replication server 130, may be set to be made every time, when an object in the content server 160 is updated (update), etc. have.

Thereafter, when the browser of the client 110 receives a URL for requesting content from the content server 160, the resolver of the client 110 queries the local name server 120 for the IP address of the content server 160. (S405).

The local name server 120 that receives the query for the IP address of the content server 160 in step S405 queries the content server name server 150 for the content server 160 IP address. (S410).

The content provider name server 150 receiving the query in step S410 transmits the IP address of the content server 160 to the local name server 120 (S415), and receives the IP address of the content server 160. One local name server 120 transmits the IP address of the content server 160 to the client 110 (S420).

In step S420, the client 110, which has received the IP address of the content server 160, requests the content server 160 using the content 110 (S425).

Receiving the content request in step S425, the content server 160 selects a CDN provider to transmit the corresponding object among the plurality of CDN providers with reference to the location of the client 110, indicating the object storage location of the selected CDN provider The URL is rewritten to the object information of the page (S430).

In operation S430, for example, the location of the client 110 may be determined using the IP address information of the client 110. In operation S430, service area information of a plurality of CDN providers contracted by a content provider, storage object information serviced by each CDN service provider, storage location URL information of an object stored by each CDN service provider, and correspond to each service area. The CDN provider may be selected by referring to a global network map including one or more of IP address information of the client.

The content server 160 transmits the page rewriting the object URL to the client 110 in step S430 (S435).

The client 110 that has received the page in step S435 parses the received page (S440). As a result of parsing in step S440, the client 110 that finds the object URL rewritten by the content server 160 in step S430, the replica server 130 to send the object to the local name server 120. The IP address is queried (S445).

The local name server 120 receiving the query in step S445 queries the IP address of the replication server 130 to transmit the object to the provider name server 140 which is the name server of the CDN provider side selected in step S430. (S450).

The operator name server 140 receiving the query in step S450 selects a replication server 130 to transmit the object to the client 110 among one or more replication servers (S455), and selects the selected replication server 130. The IP address is transmitted to the local name server 120 (S460).

In step S455, for example, one or more pieces of data traffic information of one or more replication servers, local proximity information between one or more replication servers and the client 110, and object information stored by each of the one or more replication servers are considered. By selecting the optimal replication server 130 to transmit the object contained in the page.

The local name server 120 having received the IP address in step S460 transmits the IP address of the replication server 130 selected in step S455 to the client 110 (S465). The client 110 requests the object included in the page to the replication server 130 using the IP address received in step S465 (S470), and receives the corresponding content transmitted from the replication server 130. It is used to display the browser window or the like (S475).

According to the present invention, a content provider name server may select a particular provider from among a plurality of CDN providers to provide an object included in a page, and through this, a content provider may contract with a CDN provider who does not have a global network infrastructure. Even if it is concluded, it can quickly respond to the client's content request without any additional middle mile response delay.

1 is a block diagram of a content distribution system through a plurality of CDN operators according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the content server shown in FIG. 1.

FIG. 3 is a configuration diagram of global network map information stored in the global network map database shown in FIG. 2.

4 is a flowchart illustrating a content distribution method according to an embodiment of the present invention.

Claims (14)

A storage step of receiving and storing an object included in a page from a content server by one or more replication servers of a plurality of content delivery network (CDN) providers; The content server, which has requested the page from a client, selects a CDN provider to transmit the object among the plurality of CDN providers by referring to the location of the client, and the storage location of the object in the page is the object of the selected CDN provider. A page sending step of rewriting the page to be a Uniform Resource Locator (URL) as a storage location and transmitting the rewritten page to the client; And The object among the one or more replication servers in a business name server corresponding to the URL from which the IP (Internet Protocol) address query of the replication server storing the object is received from the local name server on the client side receiving the page; Transmitting an IP address of a specific replication server to be transmitted to the client via the local name server; Content distribution method through a plurality of CDN providers comprising a. The method of claim 1, wherein the page sending step And the content server refers to the location of the client by using the IP address information of the client. The method of claim 1, wherein the page sending step Wherein the content server selects a CDN service provider to which the object is to be transmitted by referring to a global network map including at least one of service area information of the plurality of CDN service providers and object information serviced by the plurality of CDN service providers. How to distribute content through CDN providers. The method of claim 1, wherein transmitting the object In the service provider name server, at least one of data traffic information of the one or more replication servers, local proximity information between the one or more replication servers and clients, and object information stored by each of the one or more replication servers is considered. Content distribution method through a plurality of CDN providers, characterized in that for transmitting the IP address to the local name server. One or more replication servers of a plurality of CDN providers for receiving and storing an object included in a page; Store the page and the object, transmit the object to the one or more replication servers, and when a page is requested from a client, select a CDN provider to transmit the object among the plurality of CDN providers by referring to the location of the client; And a content server for rewriting the page to transmit the rewritten page to the client so that the storage location of the object in the page is a URL which is the object storage location of the selected CDN operator. And Receiving the IP address query of the replication server storing the object from the local name server on the client side receiving the page, the local name server is obtained from the one or more replication servers to the IP address of the specific replication server to which the object is to be transmitted. A service provider name server corresponding to the URL transmitted to the client; Content distribution system through a plurality of CDN operators comprising a. The method of claim 5, wherein the content server And a location of the client by using the IP address information of the client. The method of claim 5, wherein the content server A plurality of CDN providers, wherein the CDN providers are selected to be transmitted with reference to a global network map including at least one of service area information of the plurality of CDN providers and object information serviced by the plurality of CDN providers; Content distribution system through. The method of claim 5, wherein the service provider name server The IP address of the specific replication server may be determined based on at least one of data traffic information of the one or more replication servers, local proximity information between the one or more replication servers and clients, and object information stored by each of the one or more replication servers. Content distribution system through a plurality of CDN providers, characterized in that the transmission to the local name server. Transceiver for transmitting and receiving data; A content database storing a page and an object included in the page; A global network map database storing at least one of service area information of a plurality of CDN providers and the object information serviced by the plurality of CDN providers; And Sending and storing the object to one or more replication servers of the plurality of CDN operators through the transceiver unit, and if the page is requested from the client through the transceiver unit, the location of the client and the information stored in the global network map database Selecting a CDN provider to transmit the object from among the plurality of CDN providers, and rewriting the page so that the storage location of the object in the page stored in the content database is a URL which is the object storage location of the selected CDN provider. A control unit for transmitting the rewritten page to the client through the transceiver; Content server comprising a. The method of claim 9, wherein the control unit And the location of the client is referred to using the IP address information of the client. 10. The system of claim 9, wherein the global network map database is Content server, characterized in that further comprising IP address information corresponding to the service area of the plurality of CDN providers. The method of claim 11, wherein the control unit And a CDN service provider for transmitting the object by further referring to the IP address information. 10. The system of claim 9, wherein the global network map database is Content server, characterized in that further comprises a storage location URL information of each of the plurality of CDN operators. The method of claim 13, wherein the control unit Rewriting the page so that the storage location of the object in the page becomes the URL which is the object storage location of the selected CDN service provider with reference to the object storage location URL information of each of the plurality of CDN providers included in the global network map database. Content server, characterized in that.

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