KR101066871B1 - System and method for content delivery using cache server and browser cache - Google Patents

Abstract

The present invention relates to a system and method for delivering content using a cache server and a browser cache, wherein the content server transmits and stores content in a cache server and a browser cache, which are data stores, and stores a client to transmit content to a business name server. In response to requesting an IP address, the service provider name server includes a process of returning the IP address of the storage to which the content is transmitted to the client in consideration of the response speed between the client and the cache server and the response speed between the client and the browser cache. The optimal storage among the cache server and the browser cache storing the content can be selected to respond to the content request.

CDN, Cache Server, Replication Server, Ghost Server, Browser Cache

Description

System and method for content delivery using cache server and browser cache}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content delivery system and method. In particular, when there is a content request from a client, a cache server and one or more browser caches of a CDN (Content Delivery Network) provider storing the corresponding content The present invention relates to a content delivery system and method using a cache server and a browser cache to allow a corresponding storage to be transmitted in consideration of response speed.

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 was 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 (hereinafter referred to as a cache server).

However, it is expensive and time-consuming for CDN operators to install and operate cache servers with capacity and response time that clients can satisfy in all regions of the world. In addition, the currently commercialized CDN service designates a cache server corresponding to the IP (Internet Protocol) address of the client, and if there is a content request from the client, checks whether the corresponding content is stored in the corresponding cache server, and is not stored. If not, it uses a method of sending a request to a content server.

However, there is a problem that if a specific content is not stored in the cache server corresponding to the client, content requests are crowded to the origin content server providing the content. . Accordingly, there is a need for a method capable of providing content requested from a client without adding a cache server.

The present invention has been proposed to solve the above-mentioned problems, and when there is a content request from the client, the response speed between the client and the cache server storing the content and the response speed between the client and the browser cache belonging to another client In view of the above, an object of the present invention is to provide a content delivery system and method using a cache server and a browser cache to transmit corresponding content in an optimal storage.

Content delivery method using the cache server and the browser cache of the present invention for achieving the above object, the storage step of transmitting and storing the content in the cache server and the one or more browser cache, the content server, the client name of the operator A request step of requesting an IP address of a storage to transmit the content to a server, and the service provider name server transmitting the content in consideration of a response speed between the client and the cache server and a response speed between the client and the one or more browser caches; And returning the IP address of the storage to the client.

In the content transmission method using a cache server and a browser cache according to the present invention, the storing step is characterized in that for storing the content transmitted by the content server in response to a content request from a specific client.

In the content transmission method using the cache server and the browser cache according to the present invention, the storing step is characterized in that for transmitting in advance the content having a relatively high request frequency than other content is stored in advance.

In the content transmission method using a cache server and a browser cache according to the present invention, the storing step, characterized in that for transmitting the content in advance expected from the client to store it.

In the content transmission method using the cache server and the browser cache according to the present invention, the returning step, the browser cache including the browser cache of the client of the browser cache group grouped by the operator name server including a plurality of browser cache The response speed of the at least one browser cache belonging to the group and the client may be considered.

In the content transmission method using a cache server and a browser cache according to the present invention, in the returning step, the browser cache group is characterized by grouping the plurality of locally cached browser cache.

In the content transmission method using a cache server and a browser cache according to the present invention, in the returning step, the browser cache group is grouped to include the browser cache overlapping with other browser cache groups.

In the content transmission method using a cache server and a browser cache according to the present invention, the returning step is characterized by returning the IP address by measuring the response speed when the IP address request is received in the requesting step.

In the content transmission method using a cache server and a browser cache according to the present invention, the returning step is characterized by returning the IP address when the response rate is measured in advance and receives an IP address request in the requesting step.

In the content transmission method using a cache server and a browser cache according to the present invention, the returning step is characterized in that to return the IP address of the storage in consideration of the load on the network.

In the content transmission method using a cache server and a browser cache according to the present invention, the returning step is characterized in that for measuring the response speed at a predetermined measurement time.

In the content transmission method using a cache server and a browser cache according to the present invention, the returning step is characterized in that for measuring the response speed according to a predetermined measurement period.

In the content transmission method using the cache server and the browser cache according to the present invention, the returning step, characterized in that for returning the IP address of the storage having the fastest response speed of the response speed.

Contents delivery system using the cache server and the browser cache of the present invention for achieving the above object, the cache server for receiving and storing the content from the content server and transmitting to the client when the request for the content from the client, And receiving a request for an IP address of a storage for transmitting the content from the client, considering a response speed between the client and the cache server and a response speed between the client and the one or more browser caches storing the content. A service provider name server that returns an IP address to the client.

In the content delivery system using a cache server and a browser cache according to the present invention, the service provider name server, belonging to the browser cache group including the browser cache of the client of the browser cache group grouped by including a plurality of browser cache The response speed of at least one browser cache and the client may be considered.

Operator name server of the present invention for achieving the above object, the input / output unit for transmitting and receiving data, the response speed between the client and the cache server stores the content and the response speed between the client and one or more browser caches stored the content A controller for returning the IP address of the storage to which the content is to be transmitted to the client in consideration of the response speed information retained by the database when a request for the IP address of the storage to which the content is to be transmitted is received from the client through the input / output unit. It includes.

Business name server of the present invention for achieving the above object, the input and output unit for transmitting and receiving data, a cache server and a database unit having the content information stored in one or more browser cache, and transmits specific content from the client through the input and output unit A control unit for measuring a response speed between the storage storing the specific content and the client and returning the IP address of the storage having the fastest response speed to the client when the IP address of the storage is requested by referring to the content information held by the database unit; It includes.

According to the present invention, in consideration of the response speed between the cache server and the browser cache storing the content and the client requesting the content, the content can be transmitted from an optimal storage having a better network or faster response time. It is possible to promote the efficient use and user convenience.

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 delivery system according to an embodiment of the present invention. Referring to Figure 1, the content delivery system of the present embodiment is the first client to the n-th client (110-1, ..., 110-n), the first browser cache to the n-th browser cache (120-1,. ..., 120-n), a provider name server 130, a cache server 140, a content server 150, and a network 160.

The first to nth clients 110-1,..., And 110-n refer to a terminal such as a computer that receives information from a server connected to the network 160. When the first client to the n-th client 110-1,..., 110-n receives a Uniform Resource Locater (URL) for requesting specific content from a browser, a DNS (Domain Name Server) Access the business name server 130 having a function of) and convert the domain name into the IP address of the content server 150 or the cache server 140 that provides the corresponding content, and the server corresponding to the IP address. It acts as a connection.

The first browser cache to n-th browser caches 120-1 to 120-n are browsers of the first to n-th clients 110-1 to 110-n, respectively. The content repository corresponding to. That is, when each browser receives specific content from the content server 150 or the cache server 140, the corresponding client of the first browser cache to n-th browser cache (120-1, ..., 120-n) It is stored in the browser cache and used to display through the browser window.

The operator name server 130 refers to a DNS (Domain Name Server) for converting a domain name into an IP address, and converts a symbolic name to a numeric address used by a machine to inform the name server. It is a kind. The operator name server 130 is a name server operated by a CDN provider for providing a CDN service and has IP address information of the cache server 140.

The cache server 140 is called, for example, a copy server or a ghost server, and is a storage that stores a copy of content data stored and managed by the content server 150. The cache server 140 quickly responds to a content request from any one of the first to n th clients 110-1,..., 110-n.

The content server 150 stores a web page and an object provided by the content provider, and then stores the web page and the object from one of the first to n-th clients 110-1,..., 110-n. Server that responds to content requests. That is, the content server 150 serves to transmit content requested from a specific client, and transmits and stores some of the content held by the content server 150 to the cache server 140. Through this, it is possible to quickly provide the content according to the request of the specific client in the cache server 140.

The network 160 transmits data and information between the first to n-th clients 110-1,..., 110-n, the business name server 130, the cache server 140, and the content server 150. It means a data communication network for exchange.

When a URL for a content request is input to a browser of any one of the first to n th clients 110-1,..., 110-n, the corresponding name is transmitted to the operator name server 130 via a local name server. You will be asked for the IP address of the repository to transfer the content to.

For example, if the client requesting specific content is the first client 110-1, the operator name server 130 may respond to the response speed between the first client 110-1 and the cache server 140 and the first client 110. -1) and the content of the first client 110-1 in consideration of the response speed with at least one of the second browser caches and the n-th browser caches 120-2, ..., 120-n. It selects the storage to be transmitted to and returns the IP address of the selected storage to the first client 110-1.

In this case, when the operator name server 130 receives an IP address request from the first client 110-1, the operator name server 130 may measure the response speed of each store, select a store, and transmit the IP address of the store. In addition, the operator name server 130 measures the response speed in advance and stores the corresponding information. When the IP address request is received from the first client 110-1, the operator name server 130 selects the storage by referring to the stored response speed information. You can also send the repository's IP address.

In the case of measuring the response speed in advance in the operator name server 130, for example, it is possible not only to set a specific measurement time and to measure the response speed at the set time, but also to set the measurement cycle of the response speed and Therefore, the response speed may be measured.

When the operator name server 130 measures the response speed in response to the IP address request from the first client 110-1 and returns the IP address of the storage to which the content is to be transmitted, or with reference to the response speed information measured in advance, In case of returning an address, an optimal storage is selected to return an IP address of the corresponding storage, and the optimal storage selection may be performed by selecting a storage having the fastest response speed.

In addition, the return of the IP address of the storage to which the content is to be transmitted, for example, the operator name server 130 returns the IP address of the relatively low load to the first client 110-1 in consideration of the network load of each storage. It can also be done in a way.

In one embodiment of the present invention, the first browser cache (120-1) in the first client (110-1), and the second browser cache to n-th browser cache (120-2, ..., ... 120-n) may be a browser cache grouped to belong to the same browser cache group. For example, the first to n-th browser caches 120-1, ..., 120-n grouped into the same group may be browser caches within a client that are locally adjacent to each other, which may be a locally cached client or This is because the response speed between browser caches is generally fast.

In this case, the browser cache included in each group may be grouped so as not to overlap each other, and some browser caches may be grouped in overlapping manner so that they belong to different groups.

The configuration and operation of the operator name server 130 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 operator name server 130 shown in FIG. 1 according to an embodiment of the present invention. Referring to FIG. 2, the operator name server 130 according to the present exemplary embodiment includes an input / output unit 210, a controller 220, and a database unit 230.

The input / output unit 210 has an interface for transmitting and receiving data through the network 160.

The database unit 230 stores a content information stored in the cache server 140 and content information stored in one or more browser caches among the first browser caches to the n-th browser caches 120-1, ..., 120-n. to be.

The controller 220 receives a request for an IP address of a storage to transmit content from a specific client among the first to nth clients 110-1,..., 110-n through the input / output unit 210. By referring to the content information held by the unit 230, the response speed between the storage having the corresponding content and the specific client is measured, and the IP address of the storage having the fastest response speed is returned to the specific client.

In another embodiment of the present invention, the database unit 230 is a response speed between each of the first to n-th client (110-1, ..., 110-n) and the cache server 140 and the first client to the first n Response between each of the clients 110-1, ..., 110-n and one or more of the first and second browser caches 120-1, ..., 120-n belonging to the other client. It holds speed information.

In this case, the controller 220 receives a request for an IP address of a storage to transmit content from a specific client among the first to nth clients 110-1,..., 110-n through the input / output unit 210. In response to the response speed information retained by the database unit 230, the IP address of the storage to which the content is to be transmitted is returned to the client. As described above, the returned IP address may be the IP address of the storage having the fastest response speed.

Information held by the database unit 230 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 3 and 4.

3 is an exemplary diagram of a browser cache group table 310 and a link information table 320 stored in the database unit 230 of FIG. 2 according to an embodiment of the present invention.

Referring to the browser cache group table 310 in FIG. 3, the client IP address and the browser cache group item are configured. The link information table 320 also consists of a browser cache group, a client IP address, and a stored content item.

In the browser cache group table 310, a client IP address item is a field including IP address information corresponding to each client. The browser cache group item is a field including information of the browser cache group to which the browser cache corresponding to each client IP address belongs.

In the link information table 320, the browser cache group item is an information field linked to each browser cache group item in the browser cache group table 310, and the link of the information is, for example, a linked list. It may be made in the form of). The Client IP Address field is a field containing IP address information of clients belonging to each browser cache group. The stored content item is a field indicating information of content stored in the browser cache of each client.

Referring to the browser cache group table 310, it can be seen that the browser cache of the client whose IP address is '111.111.111.110' belongs to the first group. In the link information table 320 linked to the first group item, the IP address of the client browser cache belonging to the first group is '111.111.111.110', '111.111.111.111', '111.111.111.112', ... It can be seen that.

At this time, the contents stored in the browser cache of the client whose IP address is '111.111.111.110' are 'image1.gif' and 'image2.gif'. Similarly, the image of the client having the IP address of '111.111.111.111' is 'image1.' You can see that the contents of '.gif' and 'image3.gif' are stored and the contents of 'image2.gif' and 'image3.gif' are stored in the browser cache of the client whose IP address is '111.111.111.112'. have.

When the client having an IP address of '111.111.111.110' requests an IP address of a storage to transmit contents of 'image3.gif' to the operator name server 130, the operator name server 130 receiving the information stores the corresponding contents. Response rate between the cache server 140 and a client having an IP address of '111.111.111.110', and a client browser cache each having an IP address of '111.111.111.111' and '111.111.111.112' and an IP address of '111.111.111.110' Measure the response speed between clients. The IP address of the storage with the fastest response rate is returned to the client whose IP address is '111.111.111.110'.

4 is an exemplary diagram of a response speed information table 400 stored in the database unit 230 of FIG. 2 according to an embodiment of the present invention. In this embodiment, the database unit 230 of the operator name server 130 further adds the response rate information table 400 as well as the browser cache group table 310 and the linked information table 320 shown in FIG. It includes, so that the control unit 220 of the operator name server 130 can be used to select a store to send a specific content and return the IP address of the store to the client.

Referring to FIG. 4, the response rate information table 400 includes a client IP address, an IP address of another client, and a response rate.

The client IP address item is a field containing IP address information of a client requesting content.

The IP address item of another client is a field including IP address information corresponding to the browser cache of another client, belonging to the same browser cache group as the browser cache of the specific client.

The response rate field is a field that contains response rate information between each client and the browser cache belonging to another client.

In the response information table 400, the IP addresses of other client browser caches belonging to the same browser cache group as the client browser cache of the IP address '111.111.111.110' are '111.111.111.111', '111.111.111.112',. It can be seen that. The response speed between the client of the IP address '111.111.111.110' and the client browser cache corresponding to the IP address '111.111.111.111' is '1 ms', and the client of the IP address '111.111.111.110' and the IP address '111.111.111.111' It can be seen that the response speed between the corresponding client browser cache is '2 ms'.

For example, the service provider name server 130 receives an IP address of a storage storing specific content from a client having the IP address '111.111.111.110', and the IP address of the browser cache storing the content is '111.111.111.111'. And '111.111.111.112', the cache server storing the content does not exist or the response speed between the cache server 140 storing the content and the client of the IP address '111.111.111.110' is '3 ms'. If it is assumed, the operator name server 130 returns the IP address '111.111.111.111' of the client corresponding to the store having a faster response time to the client of the IP address '111.111.111.110'.

A content providing process according to an embodiment of the present invention will be described in more detail with reference to FIG. 5.

5 is a flowchart illustrating a content transmission method according to an embodiment of the present invention. 1 and 5, first, specific content is transmitted from the content server 150 to the cache server 140 to be stored and transmitted (S510). In addition, the content server 150 includes a second browser cache 120-2 to transmit and store the corresponding content to one or more browser caches (S520). In this case, the steps of S510 and S520 may be performed in a reverse order.

The browser cache for receiving and storing the content in step S520 may be, for example, a browser cache grouped into a plurality of browser caches, and the grouping may be performed by grouping a plurality of locally adjacent browser caches into one group. Can be done.

The transmission and storage of the content in steps S510 and S520 may be performed in a manner of storing the content transmitted by the content server 150 in response to a content request from a specific client.

In addition, the content transmission and storage in the step (S510) and the step (S520), the content of the request frequency from the client or the content that is relatively high request frequency compared to other content of the content stored in the content server 150, It may be made in such a manner that the request is transmitted and stored before the request from the specific client.

Thereafter, the first client 110-1 transmits the IP address of the store to which the corresponding content is to be transmitted to the first client 110-1 among the stores in which the contents are stored in steps S510 and S520. Request (S530).

The operator name server 130 receiving the IP address request in step S530 may include a response speed between the first client 110-1 and the cache server 140 and one or more browser caches storing the first client and the corresponding content. Considering the response speed (S540), and returns the IP address of the client to which the second browser cache 120-2 selected as the optimal storage belongs to the first client (S550).

Considering the response speed in the step (S540), for example, after receiving the IP address request may be made in a manner of measuring and considering the response, or in advance by measuring in a predetermined manner in the operator name server 130 The response speed may be considered with reference to the stored response speed information.

At this time, the response speed measurement, for example, the operator name server 130 transmits the IP address of the cache server 140 or IP address information of the client corresponding to each browser cache to the first client (110-1). After the first client 110-1 transmits a message for calculating a response speed to each of the corresponding stores to receive a response, the operator name server 130 receives the required round trip time (RTT) information. Could be done in a way.

In step S550, for example, the IP address information of the second browser cache 120-2 client having the fastest response speed among the response speeds considered in step S540 is returned to the first client 110-1. can do. In this case, the browser cache 120-1 and the second browser cache 120-2 of the first client 110-1 may be browser caches belonging to the same browser cache group.

In operation S550, the first client 110-1 that receives an IP address corresponding to the second browser cache 120-2 connects to the IP address and requests content (S560). The content is received from the cache 120-2 (S570). Content transmission in step S570, for example, may be made in a peer to peer (P2P: Peer to Peer) manner.

According to the present invention, in consideration of the response speed of the cache server and the browser cache storing the content requested from the client, it is possible to transmit the corresponding content in an optimal storage having a better network condition or faster response time. Through this, it is possible to quickly respond to content requests from clients without expanding and operating a cache server to provide CDN services, thereby distributing content requests to the cache server and content server, CDN service providers and The convenience of the user can be enhanced.

1 is a block diagram of a content delivery system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a service provider name server shown in FIG. 1.

3 is an exemplary diagram of a browser cache group table and a link information table stored in the database unit of FIG. 2.

4 is an exemplary diagram of a response speed information table stored in the database unit of FIG. 3.

5 is a flowchart illustrating a content transmission method according to an embodiment of the present invention.

Claims (17)

A storage step of the content server transmitting and storing the content in a cache server which is a data storage and one or more browser caches; A request step of a client requesting an Internet Protocol (IP) address of a storage for transmitting the content to a business name server; And Returning, by the operator name server, an IP address of a storage to which the content is to be transmitted to the client in consideration of a response speed between the client and the cache server and a response speed between the client and the one or more browser caches; Content delivery method using a cache server and browser cache comprising a. The method of claim 1, wherein the storing step And the content server stores the content transmitted in response to a content request from a specific client. The method of claim 1, wherein the storing step Content transmission method using a cache server and a browser cache, characterized in that for transmitting and storing the selected content in accordance with a predetermined criteria in advance. The method of claim 1, wherein the storing step And transmitting and storing the content that is expected from the client in advance. The method of claim 1, wherein the returning step A response speed between the at least one browser cache belonging to the browser cache group including the browser cache of the client among the group of browser caches grouped by the service provider name server including the plurality of browser caches, and the response speed of the client Content delivery method using a cache server and browser cache, characterized in that the consideration. The method of claim 5, wherein in the return step And the browser cache group groups the plurality of browser caches that are locally adjacent to each other. The method of claim 6, wherein in the return step The browser cache group is a content delivery method using a cache server and a browser cache, characterized by grouping to include the browser cache overlapping with other browser cache group. The method of claim 1, wherein the returning step And receiving the IP address request in the requesting step and measuring the response speed to return the IP address. The method of claim 1, wherein the returning step And measuring the response speed in advance and returning the IP address when the IP address request is received in the requesting step. The method of claim 8 or 9, wherein the returning step Returning the IP address of the storage in consideration of the load on the network, characterized in that the content transfer method using a cache server and browser cache. The method of claim 9, wherein the returning step The content transmission method using a cache server and a browser cache, characterized in that for measuring the response speed at a predetermined measurement time. The method of claim 9, wherein the returning step The content transmission method using a cache server and a browser cache, characterized in that for measuring the response speed according to a predetermined measurement period. The method of claim 1, wherein the returning step And a cache server and a browser cache. The method of claim 1, wherein the IP address of the storage having the fastest response speed is returned. A cache server receiving and storing content from a content server and transmitting the content to the client when a request for the content is received from the client; And When the IP address of the storage to which the content is to be transmitted is requested from the client, the IP of the storage to which the content is transmitted in consideration of a response speed between the client and the cache server and a response speed between the client and one or more browser caches storing the content. A service provider name server that returns an address to the client; Content delivery system using a cache server and browser cache comprising a. 15. The method of claim 14, wherein the service provider name server A cache server and a browser cache, characterized in that the response speed of the at least one browser cache belonging to the browser cache group including the browser cache of the client and the response speed of the client is considered. Content delivery system using. Input and output unit for transmitting and receiving data; A database unit having response speed information between a client and a cache server storing content and response speed information between the client and at least one browser cache storing the content; And A controller which, when receiving an IP address of a storage for transmitting the content from the client through the input / output unit, returns the IP address of the storage for transmitting the content to the client in consideration of the response speed information held by the database; Business name server that includes. Input and output unit for transmitting and receiving data; A database unit having content information stored in a cache server and at least one browser cache; And When the IP address of the storage to transmit specific content is requested from the client through the input / output unit, the response speed is measured between the storage storing the specific content and the client by referring to the content information held by the database unit, and the storage having the fastest response speed. A control unit for returning the IP address of the client to the client; Business name server that includes.

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