KR20100054657A - System and method for contents delivery based on multiple content delivery network providers, and content provider name server thereof - Google Patents

Abstract

PURPOSE: A content distribution system, a method thereof and a contents provider name server through a plurality of CDN business carrier without internetworking between CDN providers are provided to receive a page and an object by transmitting a domain name of the selected CDN business carrier to a local name server of the client. CONSTITUTION: A duplication server stores a page and objects included on a page(S400). The contents provider name server selects the CDN business carrier transmitting page and objects with reference to the location of the client(S415). The contents provider name server transfers the domain name information of the selected CDN business carrier to the local name server(S420). The business carrier name server transmits the IP address of the specific replicated server.

Description

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

The present invention relates to a content distribution system and method through a content delivery network (CDN) provider, and a content provider name server. In particular, a content provider inquiries from a client of an IP address of a server storing a page and an object included in the page. A plurality of CDN providers that select a CDN provider to provide the corresponding page and object among a plurality of CDN providers in a name server, and transfer the domain name of the selected CDN provider to a local name server on the client side so that the client receives the pages and objects. It relates to a content distribution system and method through the content provider name server.

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 a 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 this 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, and the content provider name server inquiries about the IP address of the server storing the page and the object included in the page and the corresponding page and the object among the plurality of CDN providers Content distribution system and method through a plurality of CDN providers for selecting a CDN provider to be provided and transmitting the domain name of the selected CDN provider to a local name server on the client side so that the client receives pages and objects, and the content provider name server The purpose is to provide.

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 page and the object included in the page from one or more replication server of a plurality of CDN operators The content provider name server receiving the IP address query of the server storing the page and the object from the local name server on the client side transmits the page and the object among the plurality of CDN providers by referring to the client location. A delivery step of selecting a CDN provider and transferring domain name information of the selected CDN provider to the local name server; and receiving the IP address query of a replication server storing the page and the object from the local name server. The one or more replicas in the provider nameserver corresponding to the name A transmission step of transmitting the IP address of the specific replication server to transfer the page and the object of the server to the client via the local name server.

In the content distribution method through a plurality of CDN providers of the present invention, the delivering step is characterized in that the content provider name 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 delivering step, the content provider name server is one of the service area information of the plurality of CDN providers and the page and object information serviced by the plurality of CDN providers A CDN provider for transmitting the page and the object is selected by referring to a global network map including the above information.

In the content distribution method through a plurality of CDN providers of the present invention, the delivering step, characterized in that the content provider name server delivers the CDN provider domain name information in the CNAME resource record to the local name server. .

In the content distribution method through a plurality of CDN providers of the present invention, the transmitting step, the local name server to query the IP address of the replication server with reference to the CDN provider domain name information included in the CNAME resource record It is characterized by.

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

Content distribution system through a plurality of CDN operators of the present invention for achieving the above object, a content server for providing a page and the objects contained in the page, receiving and storing the page and the object from the content server Receiving an IP address query of the server storing the page and the object from one or more replication servers of a plurality of CDN providers and a local name server on the client side, the page of the plurality of CDN providers with reference to the client location And a content provider name server that selects a CDN provider to transmit the object to and transfers the domain name information of the selected CDN provider to the local name server, and an IP of a replication server storing the page and the object from the local name server. When receiving the address query, the one or more of the replication server And a business name server corresponding to the domain name for transmitting a page and an IP address of a 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 provider name server is characterized by referring to the location of the client using the IP address information of the client.

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

In the content distribution system through a plurality of CDN providers of the present invention, the content provider name server is characterized by including the CDN provider domain name information in the CNAME resource record to deliver to the local name server.

In the content distribution system through a plurality of CDN providers of the present invention, the local name server is characterized by querying the IP address of the replication server by referring to the CDN provider domain name information included in the CNAME resource record. .

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 information of the stored page and object information.

Content provider name server of the present invention for achieving the above object, the transmission and reception unit for transmitting and receiving data, the service area information of a plurality of CDN operators and one or more information of the page and object information serviced by the plurality of CDN providers Receiving, from the stored global network map database and a local name server on the client side, an IP address query of a server storing a specific page and an object included in the specific page through the transceiver, the location of the client and the global network A control unit which selects a CDN provider to transmit the specific page and an object included in the specific page from the plurality of CDN providers by referring to the information stored in the map database, and transfers the domain name information of the selected CDN provider to the local name server; It includes.

In the content provider name server of the present invention, the controller refers to the location of the client using IP address information of the client.

In the content provider name 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 provider name server of the present invention, the control unit may further select the CDN provider to transmit the specific page and the object included in the specific page by further referring to the IP address information.

In the content provider name server of the present invention, the control unit includes the CDN service provider domain name information in a CNAME resource record and transmits the same to the local name server.

According to the present invention, the content provider's name server selects the most appropriate CDN provider for responding to the client's page and object request and routes the corresponding content request, thereby preventing additional delay time in the middle mile section. Interoperability between the two is not necessary, and thus the reliability of content delivery can be improved.

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, the client 110 queries the local name server 120 for the IP address of the server that stores the page and the objects included in the page. Subsequently, upon receiving the IP address of the server storing the page and the object included in the page from the local name server 120, the page and the object included in the page are sequentially received.

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 is a content provider name server 150 which is a name server of a content provider (CP). Inquire the IP address of the content server 160 that stores the objects included in the page.

When the local name server 120 receives the domain name information of the CDN provider to respond to the page of the client 110 and the object request included in the page from the content provider name server 150, the CDN is used by using the corresponding domain name. The name server 140, which is the name server of the operator side, requests an IP address of the replica server 130 to provide the page and the object included in the page, and delivers it to the client 110.

The replication server 130 may also be referred to as a cache server. For example, the replication server 130 may store a page stored and managed by the content server 160 and a copy of an object included in the page to store content from the client 110. Provides prompt delivery upon request.

The business name server 140 has IP address information of the replication server 130. When the provider name server 140 receives a query from the local name server 120 for the IP address of the replication server 130 to transmit the page and the object included in the page, the operator appropriate replication to respond to the page and the object request contained in the page The server 130 is selected and the IP address of the corresponding replication server 130 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 considered in consideration of one or more information of each page and object information stored.

The content server 160 is a server of a content provider that provides a page provided by a content provider and an embedded object included in the page. The content provider of the present invention makes a contract with a plurality of CDN providers and transmits and stores the page and the object included in the page from the content server 160 to a replication server held by each CDN provider. This is to allow the client 110 to receive a quick response through the replication server 130 when requesting a specific page and the objects included in the page.

The content provider name server 150 is a type of name server having domain name information of a plurality of CDN providers contracted with a content provider. In the present invention, when the content provider name server 150 receives the IP address of the server storing the page and the object included in the page from the local name server 120, referring to the location of the client 110, a plurality of CDN Among the operators, a CDN provider suitable for transmitting a page and an object to the client 110 is selected, and the domain name information of the selected CDN provider is transferred to the local name server 120.

In this case, the content provider name server 150 checks the location of the client 110 in consideration of, for example, the IP address of the client 110. The client 110 selects a specific CDN provider to provide a page and an object included in the page 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 may transmit the CDN provider domain name information to the local name server 120 by using, for example, a CNAME (Canonical NAME) method. CNAME stands for the DNS database record of the alias representing the host name.

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 provider name server 150 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 provider name server 150 shown in FIG. 1 according to an embodiment of the present invention. 1 and 2, the content provider name server 150 according to the present embodiment includes a transceiver 210, a controller 220, and a global network map database 230.

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

The global network map database 230 corresponds to service area information of a plurality of CDN providers contracted by a content provider, storage pages and object information such as pages served by each CDN service provider and objects included in the pages, and corresponding service areas. It is a repository of global network map information including one or more of the client's IP address information.

When the controller 220 receives a query for the IP address of the server storing the page and the object included in the page from the local name server 120 through the transceiver 210, the controller 110 determines the location of the client 110. Checking the location of the client 110 is performed by checking the IP address and the like of the client (110).

The controller 220 refers to the identified location of the client 110 and the global network map information stored in the global network map database 230, and transmits the pages and the objects included in the pages among the plurality of CDN providers to the client 110. Select a specific CDN provider to transfer.

Thereafter, the controller 220 includes the domain name information of the selected CDN operator in the CNAME resource record and transmits the domain name information to the local name server 120 at 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 provider name server 150 in the process of selecting a CDN provider to respond to a page of the client 110 and an object request included in the page.

Referring to FIG. 3, the global network map 300 of the present embodiment includes continent information 310, country information 320, region information 330, CDN service provider information 340, storage page and object information 350, and the like. It consists of a column of IP addresses 360.

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 page and object information 350 item is a field containing pages stored in a replication server of a CDN service provider providing CDN services in each region and object information included in the pages.

The IP address 360 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'. In addition, referring to the stored page and object information 350 item, pages stored in the replication server 130 of 'XXX' operators that provide CDN services to New York State and the objects included in the pages are 'AAA' and 'BBB'. Able to know. In addition, referring to the IP address 360, the IP address of the terminal located in the New York State area is 'X.X.X'. In this case, 'X.X.X' indicates one or more IP address information, and other IP addresses of the IP address 360 item also include one or more IP address information.

If a client 110 located in New York State queries a specific page and an IP address of a server storing a specific object included in the page, the local name server 120 of the client 110 receiving the query may The content provider name server 150 queries the IP address of the server storing the page and the object.

The content provider name server 150 receiving the query determines the location of the client 110 using the IP address of the client 110, and the client 110 in the IP address 360 item of the global network map 300. Search for an IP address that matches the IP address.

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.

Subsequently, the page and object held by the found CDN provider are searched in the storage page and object information 350 item, and if there is content that matches the page and the object requested by the client 110, the domain name information of the found CDN provider is localized. Send to server 120. On the contrary, if there is no content that matches the page and the object requested by the client 110, the CDN service provider is selected and the corresponding CDN service provider is searched by searching whether the CDN service provider serving the neighboring region stores the page and the object. The domain name information of the local name server 120 will be transmitted.

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 replication server 130 receives and stores a page of a content provider and an object included in the page from the content server 160 (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, such as a page or an object in the content server 160, 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 stores the page and the objects included in the page to the local name server 120. The IP address of one content server 160 is queried (S405).

In step S405, the local name server 120 that receives the query for the IP address of the content server 160 receives the IP address of the content server 160 storing the page and the object included in the page. Inquiry to the content provider name server 150 (S410).

The content provider name server 150 receiving the IP address query in step S410 refers to the location of the client 110 and selects a CDN service provider to transmit corresponding pages and objects from among the plurality of CDN service providers in step S415. The domain name information of the CDN provider is transferred to the local name server 120 (S420).

In step S415, for example, the location of the client 110 may be determined using the IP address information of the client 110. In operation S415, the CDN service provider may be selected by referring to a global network map including service area information of the plurality of CDN service providers and information on one or more of pages and object information serviced by the plurality of CDN service providers.

In operation S420, for example, the domain name information of the selected CDN provider may be included in the CNAME resource record and transmitted to the local name server 120.

In step S420, the local name server 120 that receives the domain name information of the CDN service provider transmits the page and the object included in the page to the service provider name server 140 that is the name server of the CDN service provider corresponding to the domain name. Inquire a server's IP address (S425).

The operator name server 140 receiving the query in step S425 selects a replication server 130 to transmit the page and the object to the client 110 among the one or more replication servers (S430). In operation S430, 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 pages and object information stored by each of the one or more replication servers. In consideration of the optimal replication server 130 can be selected.

The operator name server 140 transmits the IP address of the selected replication server 130 to the local name server 120 (S435), and the local name server 120 transmits the IP address of the received replication server 130. It transmits to the client 110 (S440).

The client 110, which has received the IP address in step S440, requests the content to the replication server 130 using this, in step S445, and the replication server 130 transmits the page to the client 110 ( S450).

The client 110 receiving the page in step S450 parses the page (S455). If the client 110 finds an object included in the page while parsing the page in step S455, the page is transferred to the copy server 130 using the IP address of the replication server 130 received in step S440. The included object is requested (S460), and the replica server 130 receives the corresponding object transmitted (S465).

According to the present invention, a content provider name server may select a particular provider from among a plurality of CDN providers to provide a page and an object included in the page. Through this, the content provider may not have a global network infrastructure. Even if a contract is made, the client can quickly respond to the client's request for content without delaying the middle mile response.

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 block diagram of a content provider name 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 (17)

A storage step of receiving and storing a page and an object included in the page from one or more replication servers of a plurality of content delivery network (CDN) providers; The content provider name server that receives the IP (Internet Protocol) address query of the server storing the page and the object from the local name server on the client side refers to the page and the list of the plurality of CDN providers by referring to the location of the client. A delivery step of selecting a CDN provider to transmit an object and transferring domain name information of the selected CDN provider to the local name server; And IP of a specific replication server to which the page and the object are to be transmitted among the one or more replication servers in an enterprise name server corresponding to the domain name that receives the IP address query of the replication server storing the page and the object from the local name server. A transmission step of transmitting an address 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 delivering step And the content provider name server refers to the location of the client using the IP address information of the client. The method of claim 1, wherein the delivering step The CDN provider to which the content provider name server transmits the page and the object by referring to a global network map including service area information of the plurality of CDN providers and one or more of page and object information serviced by the plurality of CDN providers; Content distribution method through a plurality of CDN operators, characterized in that for selecting. The method of claim 1, wherein the delivering step The content provider name server includes the CDN provider domain name information in the CNAME (Canonical NAME) resource record and delivers to the local name server, Content distribution method through a plurality of CDN providers. The method of claim 4, wherein the transmitting step And the local name server queries the IP address of the replication server with reference to the CDN provider domain name information included in the CNAME resource record. The method of claim 1, wherein the transmitting step The specific name is considered in consideration of data traffic information of the one or more replication servers, local proximity information between the one or more replication servers and clients, and information on one or more pages stored by each of the one or more replication servers. Content distribution method through a plurality of CDN operators, characterized in that for transmitting the IP address of the replication server to the local name server. A content server providing a page and an object included in the page; One or more replication servers of a plurality of CDN providers for receiving and storing the page and the object from the content server; When receiving the IP address query of the server storing the page and the object from the local name server on the client side, selecting a CDN provider to transmit the page and the object among the plurality of CDN providers by referring to the location of the client. A content provider name server configured to transfer domain name information of the selected CDN provider to the local name server; And Receiving an IP address query of a replication server storing the page and the object from the local name server, the IP address of a specific replication server to which the page and the object are to be transmitted is transmitted through the local name server. A business name server corresponding to the domain name transmitted to a client; Content distribution system through a plurality of CDN operators comprising a. The method of claim 7, wherein the content provider name server And a location of the client by using the IP address information of the client. The method of claim 7, wherein the content provider name server Selecting a CDN provider to which the page and the object are to be transmitted by referring to a global network map including service area information of the plurality of CDN providers and information on at least one of pages and object information serviced by the plurality of CDN providers; Content distribution system through a plurality of CDN providers. The method of claim 7, wherein the content provider name server And delivering the CDN service provider domain name information to the local name server by including the CNAME resource record in the CNAME resource record. 11. The method of claim 10, wherein the local name server And querying the IP address of the replication server with reference to the CDN provider domain name information included in the CNAME resource record. The method of claim 7, wherein the service provider name server The IP address of the specific replication server may be determined in consideration of data traffic information of the one or more replication servers, local proximity information between the one or more replication servers and clients, and one or more of page and object information stored by each of the one or more replication servers. Content distribution system through a plurality of CDN operators, characterized in that for transmitting to the local name server. Transceiver for transmitting and receiving data; A global network map database storing service area information of a plurality of CDN providers and at least one of information on pages and objects serviced by the plurality of CDN providers; And When a client receives a query of an IP address of a server that stores a specific page and an object included in the specific page from the local name server on the client side, the client stores the client's location and information stored in the global network map database. A control unit for selecting a CDN service provider to transmit the specific page and an object included in the specific page among the plurality of CDN service providers, and transferring domain name information of the selected CDN service provider to the local name server through the transceiver; Content provider name server comprising a. The method of claim 13, wherein the control unit And the location of the client is referred to using the IP address information of the client. 14. The system of claim 13, wherein the global network map database is The content provider name server, further comprising IP address information corresponding to the service area of the plurality of CDN providers. The method of claim 15, wherein the control unit And a CDN provider for transmitting the specific page and an object included in the specific page by further referring to the IP address information. The method of claim 13, wherein the control unit And providing the CDN provider domain name information in the CNAME resource record to the local name server.

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