KR20090029114A - Content storing apparatus and method for transmitting content and the record media recorded program realizing the same - Google Patents

Abstract

An apparatus and a method for transmitting contents and a recording medium thereof are provided to distinguish contents according to a transmission request frequency of contents, thereby dynamically determining whether it is possible to transmit contents. A transmission request about contents is received from a client receiving contents(S300). A transmission request frequency with regard to the contents is calculated(S310). The calculated transmission request frequency is compared with a preset critical value. It is determined whether contents are stored in a contents transmission device(S320). The transmission request frequency is larger than the critical value. The contents are not stored in the contents transmission device. The contents are transmitted from another apparatus in which the contents are stored(S350). The transmitted contents are transmitted to the client.

Description

Content storing apparatus and method for transmitting content and the record media recorded program realizing the same}

The present invention relates to a content transmission apparatus, method and a recording medium for transmitting content. More specifically, the content is transmitted only when the transmission request frequency is high by calculating a transmission request frequency for the content received from the client. It relates to a transmission apparatus, a method and a recording medium.

Recently, due to the development of the Internet environment, various multimedia contents are generated and distributed. In particular, UCC (User Created Content), which produces and distributes various multimedia contents in a semi-professional manner, not only for the professional production of specialized contents such as games and academies, but also for general individuals, has gained sensation in popularity. The type and amount of s have increased exponentially.

However, the bandwidth of the network is limited, and there are many transmission paths for content transmission, so clients have not been able to receive various contents properly. Therefore, the content producers and clients have been dissatisfied with the contents delivery.

What has emerged for this purpose is a content delivery service. The content delivery service is a service in which a content producer does not directly respond to all requests for content delivery from numerous clients, but has a separate content transmission device between the content producer and the client to represent the content delivery.

Despite the provision of such a content delivery service, there is still a limit to the content transmission device storing and transmitting a large amount of content due to the diversification and capacity of the content.

Therefore, in the present time when the size and type of the contents are very diverse, there is a need for improvement in such a content delivery service. If the conventional content delivery service is maintained as it is, the capacity of the content transmission device that is responsible for the transmission of various contents must be very large, and the number of content transmission devices that one content producer must bear regardless of the location of the network It grows exponentially.

Therefore, a content producer cannot produce a variety of high-capacity content and transmit it properly, and there is a problem that an excessive amount of time and money must be invested even to increase the capacity or the number of content-transfer devices.

The present invention provides a content transmission apparatus and method for efficiently transmitting content without increasing the capacity and number of the content transmission device by dynamically determining whether the content can be transmitted and dynamically determined according to the frequency of the content transmission request. The purpose is to provide a recording medium.

In addition, there is another object to provide a content transmission device, method, and a recording medium that helps to establish a development strategy of the content by providing the content provider with the frequency of the transmission request for the content.

Another object of the present invention is to provide a content transmission device, a method, and a recording medium for providing a high quality content delivery service to a client by selectively transmitting only content with a high frequency of transmission request of the client.

Other objects of the present invention will become more apparent from the detailed description for carrying out the invention described below.

According to an aspect of the present invention, a content transmission method is provided.

According to an embodiment of the present invention, there is provided a content delivery method of a content delivery device, the method comprising: receiving a transmission request for the content from a client to receive the content; Calculating a transmission request frequency for the content (b); (C) comparing the calculated transmission request frequency with a preset threshold and determining whether the content is stored in the content transmission device; (D) receiving the content from another device in which the content is stored if it is determined in step (c) that the transmission request frequency is greater than or equal to the threshold value and the content is not stored in the content transmission device; And (e) transmitting the received content to the client.

In the step (c), if it is determined that the calculated transmission request frequency is greater than the threshold value, and the content is stored in the content transmission device, further comprising the step of transmitting the content to the client, The content may continue to be stored in the content providing device.

In the step (c), if it is determined that the calculated transmission request frequency is less than a predetermined threshold value, the content is stored in the content transmission device, further comprising the step of transmitting the content to the client The content may be deleted from the content providing device.

In step (c), if it is determined that the calculated transmission request frequency is less than a preset threshold and the content is not stored in the content transmission device, the client may be connected to another device in which the content is stored. have.

The client may be connected to another device where the content is stored by using an address of another device where the content is stored.

The client may be connected to another device storing the content by receiving information of another device storing the content from a content transmission device manager that manages a storage state and a transmission state of the content transmission device and another device in which the content is stored. Can be performed.

The transmission request frequency may be the total number of transmission requests for the content received from a plurality of clients including the client during a preset period.

The other device in which the content is stored may be at least one of an origin server in which the original file of the content is stored, or another content transmission device for transmitting the content to the client.

The preset threshold may be a transmission request frequency of other content stored in the content transmission device.

The transmission request frequency of the other content may be plural, and the preset value may be the lowest among the transmission request frequencies of the other content.

Other content having the lowest transmission request frequency among the transmission request frequencies may be deleted from the content providing device.

According to another aspect of the present invention, a content transmission device is provided.

According to an embodiment of the present invention, a content transmission device for transmitting content, the content storage unit for storing the content; A transmission request frequency calculating unit for calculating a transmission request frequency for the content; A comparison determination unit comparing the frequency of the transmission request with a preset threshold value and determining whether the content is stored in the content storage unit when receiving a transmission request for the content from a client to receive the content; And when the comparison determining unit compares and determines that the transmission request frequency is equal to or greater than the threshold and the content is not stored in the content transmission device, the content is transmitted from another device in which the content is stored. And a content transmission unit for receiving the received content and transmitting the received content to the client.

As a result of the comparison and determination, the content transmission unit transmits the content to the client when the calculated transmission request frequency is greater than or equal to the threshold and the content is stored in the content storage unit. The content may continue to be stored.

As a result of the comparison and determination, the content transmission unit transmits the content to the client when the calculated transmission request frequency is less than the threshold value and the content is stored in the content storage unit. The content may be deleted.

As a result of the comparison and determination by the comparison determination unit, when the calculated transmission request frequency is less than the threshold value and the content is not stored in the content storage unit, the client is connected to another device in which the content is stored. The association may further include.

The threshold value may be a transmission request frequency of other content stored in the content storage unit.

The other content having a transmission request frequency lower than the transmission request frequency of the content among other contents stored in the content storage unit may be deleted.

According to another aspect of the present invention, a recording medium is provided.

According to an embodiment of the present invention, a recording medium on which a program for implementing a content delivery method of a content delivery device is recorded, the method comprising: receiving a request for transmission of the content from a client to receive the content; Calculating a transmission request frequency for the content (b); (C) comparing the calculated transmission request frequency with a preset threshold and determining whether the content is stored in the content transmission device; Receiving the content from another device in which the content is stored if it is determined in step (c) that the transmission request frequency is greater than or equal to the preset threshold and the content is not stored in the content transmission device (d ); And (e) transmitting the received content to the client. A recording medium having a program recorded thereon for implementing the content delivery method is provided.

In the step (c), if it is determined that the calculated transmission request frequency is greater than the threshold value, and the content is stored in the content transmission device, further comprising the step of transmitting the content to the client, The content may continue to be stored in the content providing device.

In the step (c), if it is determined that the calculated transmission request frequency is less than a predetermined threshold value, the content is stored in the content transmission device, further comprising the step of transmitting the content to the client The content may be deleted from the content providing device.

In step (c), if it is determined that the calculated transmission request frequency is less than a preset threshold and the content is not stored in the content transmission device, the client may be connected to another device in which the content is stored. have.

The client may be connected to another device where the content is stored by using an address of another device where the content is stored.

The client may be connected to another device storing the content by receiving information of another device in which the content is stored from a content transmission device manager that manages a storage state and a transmission state of the content transmission device and another device in which the content is stored. Can be performed.

The transmission request frequency may be the total number of transmission requests for the content received from a plurality of clients including the client during a preset period.

The other device in which the content is stored may be at least one of an origin server in which the original file of the content is stored, or another content transmission device for transmitting the content to the client.

The preset threshold may be a transmission request frequency of other content stored in the content transmission device.

The transmission request frequency of the other content may be plural, and the preset value may be the lowest among the transmission request frequencies of the other content.

Other content having the lowest transmission request frequency among the transmission request frequencies may be deleted from the content providing device.

According to the present invention, it is not necessary for the content delivery device to provide a content delivery service for all the contents, so that hardware damage of the content delivery device due to repeated deletion and storage of excessive content can be avoided.

In addition, according to the present invention, by providing a content delivery service only for the content selectively selected by the content delivery device, it is possible to prevent the transmission speed of the content from being lowered.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the configuration of a network including a content delivery device of the present invention.

Referring to FIG. 1, a network includes an origin server 100, an content delivery device 1 110, a content delivery device 2 120, a content delivery device 3 130, and a GLB device 140. (Global Load Balancing Apparatus), Client (Client) and Client B (160).

The origin server 100 is a server in which a content provider stores content. That is, the origin server 100 provides the content to the content transmission device 1110 to the content transmission device 3130 as another device in which the content is stored.

The origin server 100 provides the content to the content delivery device 1 (110) to the content delivery device 3 (130), the content delivery device 1 (110) to the content delivery device 3 (130) is a client A (150) or client In order to receive the content transmission request of B (160) to transmit the requested content.

In addition, since the origin server 100 itself also has content, the origin server 100 can directly transmit the requested content to the client A 150 or the client B 160. The case where the content is directly transmitted to the client A 150 or the client B 160 will be described later.

GLB device 140 is a network manager for distributing client's transmission requests, and content transmission requests from multiple clients are concentrated on one content transmission device, thereby preventing only one traffic from congesting. That is, the GLB device 140 corresponds to a content transmission device manager that periodically checks the performance and the situation of the network to connect the transmission request from each client to the optimum path from the client according to the network condition. In Figures 1 to 5 will be described by unifying the GLB equipment 140.

The GLB device 140 interoperates with a DNS server (not shown) that receives a DNS (Domain Name Service) -based transmission request and performs an IP (Internet Protocol) of the content transmission apparatuses 110, 120, and 130 on an optimal transmission path. ) May be sent to client A 150 or B 160.

In addition, GLB equipment 140 may be included in the DNS server. However, in the present invention, the location on the network of the GLB equipment 140 is not limited thereto.

The content delivery device 1 (110) to the content delivery device 3 (130) receives the content transfer request transmitted from the client A (150) or B (160) to transmit the content to the client A (150) or B (160) Device.

The content transmission device 1110 to the content delivery device 3130 are interlocked to exchange data such as content, content transmission request, and client information.

The content transmission device 1110 to the content delivery device 3130 may be operated by the same content delivery service provider or may be operated by different content delivery service providers. In the present specification, the content transmission service may be a cache service, and the content transmission device may be a cache device. That is, the cache service and the cache device refer to a service that transmits content to the client A or B (150, 160) while storing and deleting the content of the origin server. However, the name of the content delivery service or the content delivery device of the present invention is not limited thereto.

Client A 150 or B 160 corresponds to an end user in a network and includes at least one of a personal computer, a laptop, a personal digital assistant (PDA), and a mobile terminal (ME). It may also mean a browser used in such a terminal.

The content delivery service means that the content server 110 stores content requested by the origin server 100 in the content delivery device 110, 120, or 130, and receives a request for transmission of the content from the client. It is a service that delivers content.

Alternatively, when the content transmission device 110, 120, or 130 receives a content transmission request from the client A 150 or the B 160, the content transmission device 110, 120, or 130 requests the origin server 100 to receive and store the content, and then stores the content. Or transmits to B 160.

However, although the types and numbers of the origin server 100 requesting the content delivery service are diversified and the types and sizes of the content requested by the origin server 100 are also diversified, the storage capacity of the content delivery apparatus 110, 120, or 130 is not limited. There is a limit.

The content transmission device (110, 120 or 130) having a limit of such a storage capacity has to repeat the reception of the content transmission request, the content acquisition and storage, and the content transmission in this case, the data is frequently stored and deleted Depending on the load, the content transmission device 110, 120 or 130 is degraded in hardware performance.

In addition, even if the client A 150 or B 160 requests the content for the deleted content, if the content has already been deleted from the content transmission device 110, 120, or 130, the content transmission device 110, 120, or 130. Since the content must be transmitted again from the origin server 100, a serious decrease in service speed occurs.

However, according to an embodiment of the present invention, since content is selectively provided without providing a content delivery service for all contents, frequent storage and deletion of content in the content delivery apparatus 110, 120, or 130 is repeated. Can be avoided. The criterion for selecting content to provide a content delivery service is the frequency of request for delivery.

To illustrate this, for example, when the high school vacation period, the demand of the client A 150 or B 160 for the lecture video is reduced, but the demand for the movie video is increased. Accordingly, the content transmission device 1 (110) receives a transmission request for a movie video several times a day, while receiving a transmission request for a lecture video is hardly received.

Nevertheless, the movie content is not stored in the content transmission device 1 (100) but the lecture video may be stored. This is because the lecture video is already stored in the process of performing the transmission service, and the movie video is not stored because the transmission video is not stored because the transfer video was frequently requested before the vacation.

In this case, if a vacation is received and the content transmission device 1 (100) receives a movie video transmission request of 2 GB (Giga Byte) size from the client A 150, the movie video is received from the origin server 100 that provides the movie video. Store and send to client A 150.

In this process, the lecture video (for example, 9 GB) is already stored in the content transmission device 1 (110), so that the capacity (2 GB) of the movie video exceeds the remaining storage capacity (for example, 1 GB) of the content transmission device 1 (110). In one case, the content transmission device 1 110 should delete the lecture video and store the movie video.

When the client A 150 requests to send a lecture video because it wants to study again, the content transmission device 1 110 deletes the movie video again and receives and stores the lecture video from the origin server 100 that provides the lecture video. Send to Client A 150.

If the content transmission device 1110 continuously performs a content transmission service in which such multiple contents are deleted, stored, and transmitted repeatedly, the hardware may be caused by disk I / O repetition of the content transmission device 1110. Damage may occur.

In addition, a reduction in service speed may occur due to repetitive requests to the origin server 100, reception, storage, and transmission of content.

Therefore, according to an exemplary embodiment of the present invention, the content transmission device 1 110 records the number of content transmission requests transmitted from the client A 150 to calculate a transmission request frequency for each predetermined time unit. As described above, during the vacation period, the transmission request frequency for a movie video has a high value and the transmission request frequency for a lecture video has a low value.

Accordingly, the content transmission device 1 110 may provide a content transmission service only when a movie transmission request is received from the client A 150, and may not perform a content transmission service when a transmission request for a lecture video is received.

That is, when the client A 150 transmits the transfer request for the movie video through the browser, it is transmitted to the GLB device 140 through the DNS server (1A). The GLB device allows the transmission request to be delivered to the content delivery device 1 (110) having the optimal network path with the client A (2A). This may be performed by transmitting the IP address of the content delivery device 1 (110) to the client A (150) by the client A (150) to send a transmission request to the content delivery device 1 (110), as described above. same.

The content transmission device 1 (110) receiving the transfer request for the movie movie first calculates the frequency of the transfer request for the movie movie and compares it with the frequency of the transfer request for the lecture video.

If the vacation described above is started, the transmission request frequency for the lecture video will start to exceed the transmission request frequency for the movie video, so the content transmission device 1 (110) deletes the lecture video stored in advance and the movie video origin server (100). ) Can be stored in the content transmission device 1 (110) and transmitted (3A) to the client A (150).

This situation similarly occurs in the content transmission device 3 (130). That is, the transmission request frequency for a movie video exceeds the transmission request frequency for a lecture video.

However, unlike client A 150, client B 160 may request a lecture video transmission without making a movie video transmission request to compensate for the lack of learning even during vacation (1B).

The GLB device 140 allows the lecture video transmission request to be transmitted (2B) to the content transmission device 3 (130). This is because when the lecture video is transmitted from the content delivery device 3 130 located in the optimal transmission path from the client B 160, the client B 160 may receive the optimal content delivery service.

The content transmission device 3 (130) calculates the transmission request frequency for the lecture video transmission request like the content transmission device 1 (110) and compares it with the movie video transmission request frequency. The lecture video transmission request frequency is higher than the movie video transmission request frequency. Low, do not send the lecture video to the client B (160). However, if the lecture video is already stored in the content transmission device 3 130, the content transmission device 3 (130) may transmit the lecture video to the client B (160).

However, even if the content delivery device 3 130 does not store the lecture video, the content delivery device 3 130 does not receive the lecture video from the origin server 100 and provide it to the client B 160. Instead, the content transmission device 3 130 transmits a Uniform Resource Locator (URL) of the origin server 100 to the client B 160 (3B). That is, the client B 160 transmits the address of the origin server 100, which is another device in which the lecture video is stored, to be connected to the origin server. Accordingly, the client B 160 receiving the URL of the origin server 100 sends a request to the origin server 100 to transmit the lecture video again.

In this case, since a separate display screen is not output to the client B 160, the request is transmitted to the URL of the origin server 100, and therefore, the client B 160 does not recognize that the lecture video request is resent to the origin server 100. You can prevent it.

Since the origin server 100 holds the original file of the lecture video, the origin server 100 may transmit the lecture video to the client B 160 (4B).

Instead of transmitting the URL of the origin server 100 to the client B 160, the content transmitter 3 130 transmits the lecture video transmission request transmitted from the client B 160 through the proxy server 100. ) Can be sent.

The proxy server (not shown) serves to relay the content transmission request of the client to the origin server 100 and it is assumed herein that it does not perform the function of the content transmission service. However, when the proxy server performs the function of the content delivery service, the proxy server in the present specification corresponds to the content delivery device.

Therefore, the content transmission devices 1 (110) to 3 do not need to perform a content transmission service for lecture videos with low transmission request frequency, and do not need to frequently delete and store lectures and movie videos. It can ensure the performance and maintain the content delivery speed.

According to another embodiment of the present invention, the type of content for performing the content delivery service in the content delivery device 1 (110) to the content delivery device 3 (130) according to the transmission request frequency may be set differently for each content delivery device. . That is, the movie video may be transmitted from the content transmission devices 1 110 and 3 130 and the lecture video may be transmitted from the content delivery device 2 120.

That is, for this purpose, first, the content transmission device 1 (110) to the content transmission device 3 (130) calculates the lecture video and movie video transmission request frequency, respectively, and reports to the GLB equipment 140 (Report).

When the transmission request frequency of the movie video exceeds the transmission request frequency of the lecture video, the GLB device 140 performs a content transmission service for the movie video in the content transmission device 1 (110) and the content transmission device 3 (130), The content delivery device 2 120 may transmit a selective transmission command to each content delivery device to perform a content delivery service for lecture video.

Therefore, when the transmission request for the movie video from the client A (150) is delivered to the GLB equipment 140, GLB equipment 140 is the client A (content transfer device 1 110 or content transmitter 3 (130) of the (A). The client A 150 is connected to the content transmission device 1 (110) capable of transmitting the movie moving picture in the optimal condition, so as to receive the movie moving picture.

On the other hand, if the transmission request for the lecture video from the client B (160) is delivered to the GLB equipment 140, GLB equipment 140 is a client B (160) connected to the content transmission device 2 (120) to send a movie video To receive the transmission.

Accordingly, each of the content transmission apparatuses 110, 120, and 130 may prevent hardware damage and a decrease in the content transmission speed of the content transmission apparatus, which are generated by performing a content transmission service for lecture videos and movie videos.

2 is a diagram showing the configuration of a content delivery device according to an embodiment of the present invention.

Referring to FIG. 2, the content transmission device 1 110 includes a content storage unit 200, a data transmission / reception unit 210, a controller 220, and a transmission request frequency calculator 230. The content transmission device 1 110 in FIG. 2 may be any one of the content transmission devices 1 to 3 (110 to 130) in FIG. 1, but is described as the content transmission device 1 110 in FIG. 2 for convenience of description. Do it.

The content storage unit 200 is a database held by the content transmission device 1110 and receives and stores the content requested by the client A 150 or B 160 from the origin server 100. The stored content is sent to the client who requested the content.

Both the content and the content transmission request may be exchanged with the client A 150 or B 160, the origin server 100, and the other content transmission device 1 110 through the data transceiver 210.

When the client A 150 or B 160 requests the content again or another client requests the content, the content transmission device 1 110 again returns the content because the content is stored in the content storage unit 200. There is no need to send the content transmission request to the origin server 100 to receive the content.

For example, it may be assumed that the content 2250, the content 3 260, and the content 4 470 are stored in the content storage 200. That is, since the content 2 (250), the content 3 (260) and the content 4 (470) have already requested the transmission by the client A (150) or the B (160), the content transmission device 1 (110) for each content Received from the origin server 100 is transmitted to the client A (150) or B (160) and stored in the content storage unit 200.

When the client A 150 or B 160 requests the content 1 to be transmitted, the content transmission device 1 110 determines whether the content 1 is stored in the content storage unit 200, which is performed by the controller 220. . The control unit 220 will be described later.

If the content 1 does not exist in the content storage unit 200 as a result of the determination of the control unit 200, the content delivery device 1 110 requests the content 1 to be transmitted to the origin server 100 having the content to receive the content 1. do.

In this case, when the remaining capacity of the content storage unit 200 is smaller than the size of the content 1, the content transmission device 1 (110) deletes the content 2 (250) to 4 and transmits the content 1 from the origin server 100 Must be received and stored.

However, if content 1 is content that client A 150 or B 160 rarely requests, content transmission device 1 110 deletes content 2 250-4 270 and replaces content 1 with the content storage unit ( Storage at 200) is inefficient.

In particular, the contents 2250 to 4270 are more inefficient when the contents are frequently requested to be transmitted from the client 110, 120, or 130.

That is, the content 2 (250) to 4 (270), which is popular content, is expected to receive a request again from the client A (150) or the B (160). This is because the transmission device 1 110 deletes the content 1 again, receives the content 2 250 from the origin server 100, stores the content 2 250 in the content storage unit 200, and transmits the content 2 250 to the client.

If such an inefficient content transmission service continues, hardware damage occurs due to frequent input / output of the data of the content storage unit 200, and the delay problem caused by requesting the transmission and storing the transmission again to the origin server 100 cannot be avoided. .

Therefore, in order to solve this problem, the content transmission device 1 (110) of the present invention selectively performs a content transmission service based on the transmission request frequency.

That is, in FIG. 2, when the content transmission device 1 110 receives the transmission request for the content 1 from the client A 150 or the B 160, the transmission request frequency calculating unit 230 determines that the transmission request for the content 1 is received. Calculate how often

For example, suppose that Content 1 is a lecture video. If the delivery request for a lecture video was made once within the last two days, a request frequency of 1 (one) / 2 (day) is generated and content 2 (250) is a movie. Assuming that the video is a transmission request frequency for the content 2 (250) is generated 25 (times) / 2 (day).

The generated transmission request frequency may be stored in some areas of the content storage unit 200 and may be stored in a separate transmission request frequency storage unit. In addition, a lookup table in which transmission request frequency, size of content, URL of the origin server 100, etc. are arranged for each content may be stored. This may be created by a separate lookup table creating unit (not shown) or may be created by the control unit 220, which will be described in detail with reference to FIG. 5.

Therefore, when the transmission request for the content 2 250 is received, the controller 220 transmits the transmission request frequency 1/2 for the generated content 1 to the stored request frequency 25/2 for the stored content 2 250. Can be compared with As described above, the controller 220 determines whether the content 1 is stored in the content storage unit 220 and corresponds to a comparison determination unit capable of performing a logical operation for comparing the transmission request frequency.

That is, it may be determined that the transmission request frequency for the content 1 that has received the transmission request is not greater than the transmission request frequency for the content 2 250 that is already stored in the content storage unit 200, and thus the content is not transmitted. To control the data transceiver. In addition, the content 2 250 does not need to be deleted from the content storage unit 200.

If the content transmission service instead, the content transmission device 1 (110) transmits a Uniform Resource Locator (URL) or an IP (Internet Protocol) address of the origin server 100 to which the transmission request for the content 1 is sent to the client A 150. do.

 Client A 150 may access the origin server 100 using the received URL or IP address and send a content transfer request for content 1. FIG. Thereafter, the client A 150 may receive the content 1 from the origin server 100.

That is, since content 1 is content that client A 150 or B 160 does not request much, the origin server 100 also transfers content 1 directly to client A 150. May not experience.

The content transmission device 1 110 may transmit the content 1 transmission request of the client A 150 directly to the origin server 100 without transmitting the URL or the IP address of the origin server 100 to the client A 150.

Alternatively, the content transmission device 1 110 may transmit a transmission request for the content 1 to another content transmission device (not shown) that stores the content 1. That is, the content transmission device 1 110 queries the GLB device 140 for information on another content transmission device on which content transmission service for content 1 was performed. Alternatively, the content delivery device 1 110 may query whether the content delivery device is storing content 1 with a nearby content delivery device, and transmit a transmission request for content 1 to another content delivery device.

Accordingly, the content transmission device 1 (110) handovers the transmission request to the origin server 100 or another content transmission device without performing the content transmission service for the content 1 according to the transmission request frequency for the content 1 (Hand Over) can do. That is, the content transmission device 1 110 may allow the client A 150 to be connected to another device in which the content 1 is stored. The reconnection to another device may be performed through a separate reconnection unit (not shown) included in the content transmission device 100 or may be performed through the control unit 220.

In this case, the content delivery device 1 110 may apply a differential charging policy to the origin server 100 that requested the content delivery service for the content 1 that does not perform the content delivery service.

That is, when the origin server 100 directly transmits the content 1 to the client A 150, the content transmission device 1 110 transmits the content 1 through the content transfer service by a certain ratio or a predetermined amount. I can deduct the cost.

In addition, the transmission request frequency for the content 1 calculated by the content transmission device 1 110 may be provided to the origin server 100 to help the origin server 100 to produce new content or to establish a content production strategy. have.

3 is a diagram illustrating a process of a content transmission device performing a selective content transmission service.

Referring to FIG. 3, the content transmission device receives a content transmission request (S300). In FIG. 3, it is assumed that the content transmission device corresponds to the content transmission device 1 110, but the content transmission device 2 120 or the content transmission device 3 130 may perform the same function.

The content delivery device 1 (110) counts the number of received content delivery requests and determines how many transmission requests have been made in a predetermined period. That is, the content transmission request frequency is calculated (S310).

Thereafter, the content transmission device 1110 determines whether the content is already stored in the content transmission device 1110 (S320). This is because if the content has not already been deleted while being stored in the content storage 200 by performing a content transmission service to the client, the content can be transmitted to the client regardless of the frequency of the transmission request.

Therefore, when the content is stored in the content storage unit 200 transmits the content requested to the transmission to the client (S330).

If the content is not stored in the content storage unit 200, it is determined whether the corresponding content is TOP content (S340). However, even if the content is stored in the content storage unit 200, it may be determined whether the content is still TOP content because it may be a criterion for determining whether to continuously store the content or delete the content. Hereinafter, the description of FIG. 3 will be limited to the case where the content is not stored in the content storage unit 200.

The TOP content means content when the content delivery device 1110 is to perform a content delivery service and the transmission request frequency is more than a preset threshold. Here, the threshold may be a fixed value or may be a value that changes fluidly as described below.

That is, the preset threshold is a reference value of the transmission request frequency that determines whether the content can receive the content delivery service.

As described above with reference to FIG. 2, the preset threshold may be a transmission request frequency of the content 2 250 that compares the transmission request frequency for the content 1.

However, this is only a threshold value according to an embodiment of the present invention and the threshold value does not necessarily have to be the transmission request frequency of the content 2250.

That is, according to another exemplary embodiment of the present invention, the content having the lowest transmission request frequency among the contents 250 to 270 stored in the content storage unit 200 of the content transmission apparatus 1 110 (for example, content 3). By selecting, the transmission request frequency of the selected content and the transmission request frequency of the content 1 may be compared.

In addition, according to another embodiment of the present invention, rather than comparing the transmission request frequency of the content stored in the storage unit of the content transmission device 1 (110) can be compared with a preset value. Here, the preset value is a fixed value such as 15 (times) / 2 (day).

That is, for content that is requested more than 15 times in two days, the content delivery device 1110 performs a content delivery service regardless of other content already stored.

Therefore, in the above example, if the content transmission device 1110 receives a request for content 1 and a transmission request frequency of 17/2 is calculated, the content delivery device 1110 performs a content delivery service. That is, the content transmission device 1 110 receives the content 1 from the origin server 100, but deletes some of the content 2 250 to 4 only when the capacity of the content storage unit 200 is insufficient. Save it.

The content transmission device 1 110 stores the received content 1 in the content storage unit 200 and transmits the content 1 to the client A 150.

In this case, since there is a static criterion that the content delivery service is performed only when the delivery request is received at least 15 times in two days, an objective criterion is presented to the origin server 100 while selectively performing the content delivery service. There is an advantage to this.

When it is determined that the content is TOP through the various embodiments of the present invention described above, the content is acquired from the origin server 100 (S350). If the content delivery device 1110 determines that the content has been successfully acquired (S360), the content delivery device 1110 may transmit the content to the client (S330).

However, if content is not obtained due to a delay and an error of a network or a technical problem of the origin server 100, the content transmission device 1110 may transmit a message to the client that the content cannot be transmitted (S370). Client A 150 outputs a message indicating that the content cannot be found.

If it is determined in step S340 that the content is not TOP content, the content delivery device 1 (110) does not provide a content delivery service, so as described in FIG. 1, the content delivery device 1 (110) transmits a content transmission request to the origin server (100). Transfer (S380).

Alternatively, the content transmission device 1 110 transmits a content transmission request to another content transmission device or delivers the URL or IP address of the origin server 100 or another content transmission device to the client A 150 to the client A 150. It is possible to access the origin server 100 or another content transmission device to receive the content.

4 is a diagram illustrating a process in which a client receives content according to another embodiment of the present invention.

Referring to FIG. 4, the client B 160 makes a request for transmission of the content 1 to the content delivery device 1110 (S400). When the client B 160 makes a request for the content 1 directly to the content delivery device 1 110, the client B 160 obtains the URL of the content delivery device 1 110 in advance. For example, the URL embedded in a Hyper Text Markup Language (HTML) document obtained by the client B 160 from a web server (not shown) is a URL of a content transmission device.

In addition, even when a request is made to the origin server 100 through a DNS server, the IP address of the content transmission apparatus 1 110 may be transmitted to the client B 160 through the GLB device 140. This is as described in FIG.

The content transmission device 1 110 calculates a transmission request frequency as described with reference to FIGS. 1 to 3 (S410).

The content transmission device 1 110 compares the transmission request frequency of the content 1 with the transmission request frequency of the content 2 250 (S420). In this case, the transmission request frequency of the content 2 250 to be compared is merely an example of a preset threshold value and can be replaced with another content transmission request frequency or a fixed value transmission request frequency as described with reference to FIG. 3. .

When the transmission request frequency of the content 1 is lower than the transmission request frequency of the content 2 250, the content transmission device 1110 transmits a Redirect message to the client B 160 (S430). The redirect message may be directly transmitted by the content transmission device 1 110 to the client B 160 or may be performed through a DNS server interworking with the GLB device 140 or the GLB device 140. That is, the client B 160 receiving the Redirect message is connected to another device using the address included in the Redirect message.

In addition, the content delivery device 1 (110) handovers the content transfer request to the content delivery device 2 (120) (S440) to the content delivery device 2 (120) to transmit the content 1 to the client B (160). You can do that. That is, during handover, the client may transmit the IP address and other information of the client to the content delivery device 2 120 so that content 1 may be transmitted from the content delivery device 2 120 to the client B 160.

If the transmission request frequency of the content 1 is higher than the transmission request frequency of the content 2 250 in step S420, the content transmission device 1 110 deletes the content 2 250 stored in the content storage unit 200 ( S450).

The content transmission device 1 110 may secure the remaining capacity of the content storage unit 200 by deleting the content 2 250.

The content transmission device 1 110 sends a request to the origin server 100 to transmit content 1 (S460).

The origin server 100 receives the transmission request for the content 1 and transmits the content 1 to the content transmission device 1 (110) (S465). If the content 1 is not transmitted from the origin server 100, the processing of the content transmission device 1 110 is the same as described with reference to FIG.

The content delivery device 1 (110) receiving the content 1 from the origin server 100 stores the content 1 in the content storage unit 200 of the content delivery device (S470).

The content delivery device 1 110 transmits the stored content 1 to the client B 160 (S480).

However, there is a case where the client A 150 also makes a request for transmission of the content 1 to the content delivery device 2 120 (S490). The transmission request for the content 1 is transmitted to the content transmission device 2 (120) through the GLB equipment 140 as described in FIG.

The content transmission device 2 120 calculates a transmission request frequency for the content 1 like the content transmission device 1 110 (not shown). In the content transmission device 2 120, content 1 may be stored in the content storage unit of the content transmission device 2 120, and in this case, the content transmission device 2 120 may directly transmit the content 1 to the client A 150. have.

If the content 1 is not stored in the content delivery device 2 120, the content delivery device 2 120 inquires whether the content delivery device 1 (110) has the content 1 (not shown).

When the content transmission device 1 110 transmits a response message indicating that the content 1 is being stored, the content transmission device 1 110 may make a content transmission request instead of the origin server 100 (S492).

However, in this case, if the capacity for storing content 1 in the content storage unit 200 of the content transmission device 2 120 is not secured enough, it is still lower than the transmission request frequency of the content 1 compared to the transmission request frequency of other contents. Delete contents with transmission request frequency.

Thereafter, the content delivery device 2 120 receives the content 1 from the content delivery device 1 110 (S492).

The content transmission device 2 120 stores the content 1 in the content storage unit of the content transmission device 2 (120) (S496).

The content delivery device 2 120 transmits the stored content 1 to the client A 150 (S498).

5 is a view showing a lookup table stored in the content transmission device according to an embodiment of the present invention.

Referring to FIG. 5, the lookup table summarizes content capacity, storage presence, transmission request frequency, information of other content transmission apparatuses interworking with the content transmission apparatus 1110, and URLs of the origin server 100.

As described with reference to FIG. 2, the lookup table may be stored in a partial region of the content storage unit 200, and may be stored in a content transmission device storage unit (not shown) including the content storage unit 200 or may be a separate lookup table. It may be included in the storage.

It may be assumed that the client A 150 receives a transmission request for content 1 from the content delivery device 1110. In FIG. 5, the request frequency for content 1 is 1000. In this case, 1000 means 1000 (times) / 1 (hours), which means that 1000 times of transmission requests were received from various client As 150 during one hour.

That is, it means that 999 transmission requests have been received before receiving the transmission request for the content 1 from the client A 150.

Since the content transmission device 1 (110) performs a content transmission service for all content regardless of the content transmission request frequency, the content transmission device 1 (110) is stored in the content transmission device 1 (110) despite the transmission request frequency of 2 Able to know.

That is, even if the content 1 that is requested to be sent a lot is stored in the content delivery device 1 (110), if the content delivery device 1 (110) performs a content transfer service for the content N, content 1 is the content delivery device 1 (110). Deletion and storage of the content storage unit 200 must be repeated.

Accordingly, data deletion and storage may occur repeatedly in the content storage unit 200, and hardware damage and content transmission delay may occur.

Accordingly, the content delivery device 1 110 according to an embodiment of the present invention may perform a selective content delivery service using the lookup table of FIG. 5.

For example, when the transmission request for the content 1 is received from the client A 150, the calculated transmission request frequency is 1000. Therefore, the transmission request frequency of the content 1 is higher than any of the contents 2 250 to N. Has a frequency.

The content transmission device 1 110 may delete the content of the content 2 250 through the content N and perform a content transmission service on the content 1.

The content transmission device 1 (110) according to the present invention can secure the capacity to store the content 1 by sequentially deleting the content received the lowest transmission request of the content 2 (250) to the content N.

That is, the content transmission device 1 110 may check the transmission request frequency for each content in the lookup table and delete the content N having the lowest transmission request frequency to secure 10 GB, which is the capacity of the content 1.

In addition, the capacity, storage existence, content-linked device 1 (110) and the URL of the origin server 100 for each content is included in the lookup table.

Even if the content N is deleted while the content delivery device 1110 performs the content transfer service on the content 1, the content delivery device 1 110 may receive the request for the content N again from the client A 150.

In this case, the request frequency is changed to a value between 2 and 3, but the content transmission service is not performed because the transmission frequency is still low, and the content transmission device 1 (110) does not need to delete other content.

Accordingly, as described with reference to FIGS. 1 to 4, the URL of the origin server 100 is transmitted to the client A 150 again to redirection to allow the client A 150 to be connected to the origin server 100. However, the rerouting method is not limited thereto and may be performed through DNS as described in FIG. 4.

However, in the case of content 1, since there is no other content transmission device interworking with the content delivery device 1 110 on the lookup table, the content delivery device cannot transmit a content delivery request to another content delivery device.

Client A 150 may be connected to the origin server 100 http://www.origin1.com/contentN to receive the content N. Since the content transmission device 1 (110) does not have to perform a content transmission service for content that does not have a high transmission request frequency, it is possible to reduce the work of deleting and storing the content in the content storage unit 200.

Rather, the client A 150 can receive a satisfactory delivery service for various contents, thereby providing a satisfactory content delivery service to both the client A 150 and the content provider who is the operator of the origin server 100.

6 is a diagram showing the configuration of a content transmission device manager according to an embodiment of the present invention.

Referring to FIG. 6, the content transmission device manager 600 includes a transmission request frequency receiver 620, a controller 640, and an origin server access address transmitter 660.

In FIG. 6, the content transmission device manager 600 may be the GLB device 140 described with reference to FIG. 1.

The conventional GLB equipment periodically checks the data transmission status of the content transmission apparatuses 1, 2, and 3 (110, 120, 130) in conjunction with a DNS server so that the client A 150 or B 160 is optimized from the network. The content can be efficiently transmitted to the client by accessing the content transmission device located in the transmission path of the.

However, the content transmission device manager 600 according to an embodiment of the present invention not only performs the data transmission status and the network status check performed by the conventional GLB equipment, but also provides each content transmission apparatus to provide a selective content transmission service. The content transmission request frequency is transmitted through the transmission request frequency receiving unit (110, 120, 130).

As described with reference to FIG. 1, the transmission request frequency received is a transmission request frequency calculated by each of the content transmission apparatuses 110, 120, and 130.

For example, the transmission request frequency calculated by each of the content transmission apparatuses 110, 120, and 130 for content 1 is 2 (times) / 2 (day), 3 (times) / 2 (day), and 4 ( In the case of (b) / 2 (day), the total transmission request frequency is 9 (b) / 2 (day). On the other hand, if the transmission request frequency calculated by each content transmission device for content 2 is 250 (times) / 2 (day), 300 (times) / 2 (day), and 198 (times) / 2 (day) The total transmission request frequency is 748 (times) / 2 (day).

Therefore, the storage unit (not shown) included in the content transmission device manager 600 stores 9 (number) / 2 (day) of content 1 and 748 (number) / 2 (day) of content 2. .

When the transfer request for the content 1 from the client A 150 is transmitted to the content delivery device manager 600 through a DNS server (not shown), the control unit 640 advances the content before returning the access address of the content delivery device 1. The total transmission request frequency for 1 is compared with a preset threshold.

That is, when the content transmission service is preset to be provided only when the transmission request frequency is at least 300 (twice) / 2 (day), 300/2 is a threshold.

Therefore, since the existing transmission request frequency for the content 1 is 9/2 and less than 300/2, the content transmission device manager 600 does not provide a content transmission service.

The controller 640 may control the origin server access address transmitter 660 to transmit the origin server access address to the client A 150 through the origin server access address transmitter.

In this case, like the GLB device 140 described with reference to FIG. 1, the content transmission device manager 600 of FIG. 6 may also be interworked with or included in the DNS, thereby accessing the origin server in the IP address format to the client A 150 through a DNS server. You can send the address.

However, this is only one embodiment of the present invention and according to another embodiment of the present invention, the content transmission device manager 600 may transmit the URL of the origin server 100 to the client A 150 through another network path.

Therefore, according to the content delivery device manager 600 according to an embodiment of the present invention, before the content delivery request is transmitted to the content delivery devices 110, 120, and 130, the origin server access address is transmitted to the client A 150. It can selectively provide a content delivery service.

In addition, the content transmission device manager 600 according to another embodiment of the present invention transmits the content to the client A (150) the content transmission device that transmits the highest transmission request frequency among the content transmission device (110, 120, 130) It can be designated as a content transmission device to be dedicated.

That is, it is because the probability that the content is stored in the content transmission device that has calculated the highest transmission request frequency.

For example, if the client A 150 sends a transmission request for content 1, the content transmission device manager 600 receives 2 (times) / 2 (day), 3 (times) / 2 (day), and 4 (times). The content delivery device 3 (130) that transmits the highest transmission request frequency among (2) / 2 (days) may be designated as the content delivery device to transmit content 1 to transmit the access address of content delivery device 3 to client A 150. .

Client A 150 connects to content delivery device 3 130 and content delivery device 3 130 stores content 1 to client A 150 when it is storing content 1 as described with reference to FIGS. In the case of not transmitting and storing, the originating address of the origin server can be selectively transmitted or other content transmitting apparatus can be inquired. The description thereof will be omitted since it is overlapped with those described in FIGS. 1 to 3.

 The method of the present invention as described above may be implemented in a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below And can be changed.

1 is a diagram showing the configuration of a network including a content delivery device of the present invention.

2 is a diagram showing the configuration of a content delivery device according to an embodiment of the present invention.

3 is a diagram illustrating a process of a content transmission device performing a selective content transmission service.

4 is a diagram illustrating a process in which a client receives content according to another embodiment of the present invention.

5 is a view showing a look-up table stored in the content transmission device according to an embodiment of the present invention.

6 is a diagram showing the configuration of a content transmission device manager according to an embodiment of the present invention.

Claims (18)

In the content transmission method of the content transmission device, (A) receiving a transmission request for the content from a client to receive the content; Calculating a transmission request frequency for the content (b); (C) comparing the calculated transmission request frequency with a preset threshold and determining whether the content is stored in the content transmission device; In the step (c), it is determined that the transmission request frequency is greater than or equal to the threshold and that the content is not stored in the content transmission device. (D) receiving the content from another device in which the content is stored; And And (e) transmitting the received content to the client. The method of claim 1, In step (c), When it is determined that the calculated transmission request frequency is equal to or greater than the threshold value and the content is stored in the content transmission device, Transmitting the content to the client; The content is continuously stored in the content providing device. The method of claim 1, In step (c), When it is determined that the calculated transmission request frequency is less than a preset threshold and the content is stored in the content transmission device, Transmitting the content to the client; And the content is deleted from the content providing device. The method of claim 1, In step (c), If it is determined that the calculated transmission request frequency is less than a preset threshold and the content is not stored in the content transmission device, And the client is connected to another device in which the content is stored. The method of claim 4, wherein To allow the client to connect to another device where the content is stored, And the content is performed using the address of another device in which the content is stored. The method of claim 4, wherein To allow the client to connect to another device where the content is stored, And receiving information of the other device in which the content is stored, from the content transmission device manager managing the storage state and the transmission state of the content transmission device and the other device in which the content is stored. The method of claim 1, The transmission request frequency is And a total number of transmission requests for the content received from a plurality of clients including the client during a preset period. The method of claim 1, The other device in which the content is stored is at least one of an origin server (Origin Server) in which the original file of the content is stored or another content transmission device for transmitting the content to the client. The method of claim 1, The preset threshold value is a content transmission method, characterized in that the transmission request frequency of the other content stored in the content transmission device. The method of claim 9, The transmission frequency of the other content is plural, The preset value is the content delivery method, characterized in that the lowest among the transmission request frequency of the other content. The method of claim 10, And other content having the lowest transmission request frequency among the transmission request frequencies is deleted from the content providing device. In the content transmission device for transmitting content, A content storage unit for storing the content; A transmission request frequency calculating unit for calculating a transmission request frequency for the content; A comparison determination unit comparing the frequency of the transmission request with a preset threshold value and determining whether the content is stored in the content storage unit when receiving a transmission request for the content from a client to receive the content; And As a result of the comparison and determination by the comparison determination unit, when it is determined that the transmission request frequency is greater than or equal to the threshold value and the content is not stored in the content transmission device, And a content transmission unit which receives the content from another device in which the content is stored and transmits the received content to the client. The method of claim 12, When the comparison determination unit compares and determines that the calculated transmission request frequency is equal to or greater than the threshold value and the content is stored in the content storage unit. The content transmission unit transmits the content to the client, And the content is continuously stored in the content storage unit. The method of claim 12, When the comparison determination unit compares and judges, the calculated transmission request frequency is less than the threshold value, and the content is stored in the content storage unit. The content transmission unit transmits the content to the client, And the content is deleted from the content storage unit. The method of claim 12, When the comparison determination unit compares and determines that the calculated transmission request frequency is less than the threshold value, and the content is not stored in the content storage unit, And a reconnection for allowing the client to connect to another device where the content is stored. The method of claim 12, The threshold value is a content delivery device, characterized in that the transmission request frequency of the other content stored in the content storage unit. The method of claim 12, And the other content having a transmission request frequency lower than the transmission request frequency of the content among other contents stored in the content storage unit is deleted. In the recording medium on which a program for implementing the content transmission method of the content transmission device is recorded, (A) receiving a transmission request for the content from a client to receive the content; Calculating a transmission request frequency for the content (b); (C) comparing the calculated transmission request frequency with a preset threshold and determining whether the content is stored in the content transmission device; In step (c), if the transmission request frequency is equal to or greater than the preset threshold value, and the content is determined not to be stored in the content transmission device. (D) receiving the content from another device in which the content is stored; And And (e) transmitting the received content to the client.

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