KR20160078292A - Content delivery system for providing billing process and lawful interception by filtering original content - Google Patents

Abstract

A content transmission system capable of performing charging and legitimate auditing of content transmitted from a caching device to a user terminal is disclosed. The content delivery system comprising: a caching device responsive to a transmission request for content from a user terminal, for transmitting the cached content to the user terminal, and for transmitting information related to the content transmitted to the user terminal to the core node; And a core node for acquiring a packet including the same content as the content based on the information related to the content and for down-transmitting the packet including the secured content to the billing processing and the legitimate eavesdropping device.

Description

TECHNICAL FIELD [0001] The present invention relates to a content delivery system for providing billing processing and legitimate eavesdropping through content source filtering,

The present invention relates to transmission of content transparent to charging and legitimate eavesdropping in an LTE network, and more particularly, to a system and a method for controlling a charging system process and a legitimate eavesdropping system while maintaining the functions that a cache system installed in a mobile network can provide to a network operator and a user. It involves transferring content in a manner that is transparent to the process.

Recently, users of mobile devices such as smartphones and tablets are exploding. Also, as the performance of such a user terminal is improved and the mobile communication technology is developed, a large amount of high-definition content consumption is rapidly increasing in mobile devices.

Therefore, the number of Web servers that can be provided by the content provider (CP) can not be limited. Therefore, the number of users who are rapidly increasing and the size of the content capacity may cause data loss, delay of data transmission, and / Or data discontinuity may occur in data transmission.

In such a situation, when contents are located close to the user terminal, the use of resources (resources) in the network such as seamless service and improvement of the user's perceived speed, reduction of bandwidth of the mobile communication network provider, : Content Delivery Network).

The technique of locating content at a location close to such a user terminal is referred to as mobile caching technology. The mobile caching technology refers to a content that is large in capacity or frequently requested by the user, such as image, video, audio, etc. in a web server of a content provider (CP) remotely located from a user terminal, , A user terminal), and when a content request from the user terminal is received, the cache device located closest to the user terminal responds to the cache device in response to the content request, To the user terminal, thereby improving the content access speed of the user terminal and enabling more stable contents provisioning.

Such a mobile caching system has various advantages as described above, and is currently utilized in a large number of networks as a means for solving the constant demand for users' network transmission speed.

In addition, mobile caching systems implementing mobile caching technology must adhere to the requirements of operators in the network such as handover or handoff, billing system, and lawful interception, unlike existing wired systems.

However, when the mobile caching system is utilized, stable and efficient data transmission becomes possible, while contents provided in the mobile caching system are directly served in the lower layer within the network. Therefore, in order to comply with the requirements of the carriers in the network, And problems related to legal interception.

Thus, there is a need in the art for an efficient technique associated with billing and legal interception in such caching systems. Patent Document 10-200a9-0128847 discloses techniques related to billing and the like in a caching system.

The present invention is devised in response to the above-described background art, and is intended to provide a content transmission system for efficiently performing billing and legal tapping on contents provided by a caching apparatus.

In accordance with an embodiment of the present invention for realizing the above-mentioned problems, a content transmission method performed by a core node is disclosed. The method includes receiving information related to cached content transmitted to a user terminal from a caching device and obtaining a packet containing the same content as the cached content transmitted to the user terminal based on the received information And forwarding the packet including the content so that the reserved packet passes through the P-GW (PDN Gateway).

According to an embodiment of the present invention for realizing the above-mentioned problems, a content transmission method performed by a P-GW is disclosed. The method comprising the steps of: receiving a packet including content transmitted from a core node; providing an interface for a billing process and a legitimate eavesdropping process for a packet containing the received content; Determining whether a predetermined value is a marked packet in a predetermined field; if a packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field, adding a packet including the received content And transmitting the packet including the received content to a user terminal in the case where it is determined that a predetermined value in the predetermined field is not a marked packet, .

In accordance with an embodiment of the present invention for realizing the above-mentioned problems, a content transmission method performed by a filtering apparatus is disclosed. The method comprising the steps of: receiving a packet including content transmitted from a P-GW; determining whether a packet containing the received content is a pre-determined value marked packet in a predetermined field; Filtering and dropping a packet containing the received content if the packet is determined to be a packet marked with a predetermined value in a predetermined field, and if the packet containing the received content has a predetermined value And transmitting the packet including the received content to the user terminal if it is determined that the packet is not the marked packet.

In accordance with an embodiment of the present invention for realizing the above-mentioned problem, a content transmission method performed by a caching apparatus is disclosed. The method includes the steps of: caching at least a portion of predetermined content; receiving a content transfer request message from a user terminal; determining whether content associated with the content transfer request message is cached content; Transmitting a content cached to the user terminal when the content related to the transmission request message is determined as the cached content; and transmitting, by the core node, a packet including the same content as the content transmitted to the user terminal, To the core node, information associated with the cached content to be transmitted to the user terminal.

Also disclosed is a core node for providing content transmission in accordance with an embodiment of the present invention. Wherein the core node comprises: a receiving module for receiving at least one of the content and information related to the cached content transmitted to the user terminal from the caching device; and means for transmitting to the user terminal based on at least one of the received information and the content. A packet acquisition module for generating a packet including the same content as the cached content, and a transmission module for down-streaming a packet including the content so that a packet including the content passes through the P-GW.

Also, a P-GW (PDN Gateway) for providing content transmission according to an embodiment of the present invention is disclosed. Wherein the P-GW comprises: a receiving module for receiving a packet including content transmitted from a core node; a charging processing interface for providing an interface for charging processing of a packet including the received content; A legitimate eavesdropping interface providing an interface for legitimate eavesdropping on the packet, determining whether a packet containing the received content is a pre-determined value marked packet in a predetermined field, and determining whether the received packet is a marked packet A control module for further processing the received packet if it is determined that the received packet is not a packet marked with a predetermined value in a predetermined field; Lt; / RTI >

Also disclosed is a filtering apparatus for providing content transmission in accordance with an embodiment of the present invention. The apparatus comprising: a receiving module for receiving a packet including content transmitted from a P-GW; determining whether a packet including the received content is a packet marked with a predetermined value in a predetermined field; A control module for deciding to filter and drop a packet containing the received content if a packet having a predetermined value in the predetermined field is determined to be a marked packet, A transmission module for transmitting a packet including the received content to a user terminal in a downward direction when it is determined that the predetermined value is not a marked packet.

Also disclosed is a caching apparatus for providing content transmission in accordance with an embodiment of the present invention. The apparatus comprises a caching module for caching at least a portion of predetermined content, a control module for determining whether content associated with the content transfer request message from the user terminal is the cached content, The cached content is transmitted to the user terminal in order to allow the core node to transmit a packet including the same content as the content transmitted to the user terminal, And a transmission module for transmitting at least one of the content and information related to the cached content to be transmitted to the core node.

Additionally, a content delivery system for providing content delivery in accordance with an embodiment of the present invention is disclosed. Wherein the system is adapted to transmit the cached content to the user terminal in response to a transmission request for the content from the user terminal and to transmit at least one of the content related to the content transmitted to the user terminal and the content to the core node A packet transmitting unit for transmitting a packet including the content identical to the content based on at least one of information related to the content and the content to be transmitted to the P-GW, Node.

In addition, a computer readable medium is included, including computer program code for executing a content transfer method according to an embodiment of the present invention.

A content transmission method performed by a caching device according to another embodiment of the present invention is disclosed. The method includes the steps of: caching at least a portion of predetermined content; receiving a content transfer request message from a user terminal; determining whether content associated with the content transfer request message is cached content; Transmitting a content cached to the user terminal when the content related to the transmission request message is determined as the cached content; and transmitting, by the core node, a packet including the same content as the content transmitted to the user terminal, The cached content transmitted to the user terminal may be transmitted to the core node.

A content transmission method performed by a core node in accordance with another embodiment of the present invention is disclosed. The method may include receiving the marked content sent to the user terminal from the caching device and downlinking the received content to pass the P-GW.

A caching device for providing content transmission in accordance with another embodiment of the present invention is disclosed. The apparatus comprises a caching module for caching at least a portion of predetermined content, a control module for determining whether content associated with the content transfer request message from the user terminal is the cached content, In order to allow the core node to transmit the cached content to the user terminal and to allow the core node to transmit a packet including the same content as the content transmitted to the user terminal when the content is determined to be cached content, And transmitting the cached contents to the core node.

A core node for providing content transmission in accordance with another embodiment of the present invention is disclosed. The apparatus may include a receiving module for receiving the marked content sent to the user terminal from the caching device and a transmitting module for transmitting the received content downwardly through the P-GW.

A content transmission system for providing content transmission in accordance with another embodiment of the present invention is disclosed. The system comprising: a caching device for transmitting the cached content to the user terminal in response to a transmission request for the content from the user terminal and for transmitting the content transmitted to the user terminal to the core node; And a core node for downlinking the content so that the received content passes through the P-GW.

According to the present invention, it is possible to provide a content transmission system for efficiently performing billing and legal tapping on contents provided by a caching apparatus.

1 shows a block diagram of a general content transmission system.
2 shows a block diagram of a content transmission system according to an embodiment of the present invention.
3 shows a block diagram of a core node according to an embodiment of the present invention.
4 shows a block diagram of a P-GW according to an embodiment of the present invention.
5 shows a block diagram of a filtering apparatus according to an embodiment of the present invention.
6 shows a block diagram of a caching device according to an embodiment of the present invention.
7 shows a flowchart of a content transmission method according to an embodiment of the present invention.
8 shows a flowchart of a content transmission method according to another embodiment of the present invention.
9 shows a flowchart of a content transmission method according to an embodiment of the present invention.
10 shows a flowchart of a content transmission method according to another embodiment of the present invention.

Best Mode for Carrying Out the Invention

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used throughout the drawings to refer to like elements. In this specification, various explanations are given in order to provide an understanding of the present invention. It will be apparent, however, that such embodiments may be practiced without these specific details. In other instances, well-known structures and devices are provided in block diagram form in order to facilitate describing the embodiments.

The terms "component," "module," system, "and the like, as used herein, refer to a computer-related entity, hardware, firmware, software, combination of software and hardware, or execution of software. For example, a component may be, but is not limited to, a process executing on a processor, a processor, an object, an executing thread, a program, and / or a computer. For example, both an application running on a computing device and a computing device may be a component. One or more components may reside within a processor and / or thread of execution, one component may be localized within one computer, or it may be distributed between two or more computers. Further, such components may execute from various computer readable media having various data structures stored therein. The components may be, for example, a signal (e.g., a local system, data from one component interacting with another component in a distributed system, and / or data over a network, such as the Internet, Lt; RTI ID = 0.0 > and / or < / RTI >

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

In addition, the terms " processing "and" process ", as used herein, are often used interchangeably. In addition, the terms "user" and "client ", as used herein, are often used interchangeably.

1 shows a block diagram of a conventional content transmission system.

A conventional content transmission system includes a core node (CN) 100, a P-GW (PDN gateway) 200a, a billing and legitimate eavesdropping device 200b, a serving gateway (S-GW) A Policy and Charging Rules Function 14, a public Internet 11, an original content server 12, a data source 13, and a base station eNB.

The core node 100 may be called a core network and may be a core network such as a high speed network of a large communication network capable of providing large capacity long distance voice and data services, a public switched telephone network (PSTN), an integrated services digital network (ISDN), a wide area network (WAN) A local area network (LAN), a general cable broadcasting (CATV), and the like. Content may be served to the client via the core node 100. [ The core node 100 can acquire contents from various contents providers (CP: Contents Provider) such as the public Internet 11, the content source server 12, the data source 13, and the like.

The billing and legitimate eavesdropping device 200b may be located in an EPC (Evolved Packet Core) network. Also, the billing process and legitimate eavesdropping device 200b can be independently positioned outside the P-GW 200a and can communicate with the P-GW 200a. The billing and legitimate eavesdropping device 200b may monitor the user's network usage and perform billing on the network usage. In a mobile network, it is important to charge according to the amount of network usage, since the policy of paying for data services is generalized. Also, legitimate eavesdropping can mean listening to users' use of network packets for legally permitted purposes. For example, it can legitimately intercept content used by a particular user for research purposes and investigation purposes. This billing and legitimate eavesdropping process can be performed by providing an interface for billing and legitimate eavesdropping from the P-GW 200a when the packet passes the P-GW 200a. However, in general, the caching device 400 may be located at a lower layer than the P-GW 200a, and the content stored in the caching device 400 can be served to the user without going through the P-GW 200a, There has been a problem in that it is difficult to bill and legally intercept the contents served by the caching device. The present invention can allow the content provided in the caching apparatus to pass through the P-GW 200a and perform billing and legitimate eavesdropping. This will be described later.

The policy management system 14 may be configured as a combination of a service-based quality assurance policy setting supply function and a flow-based billing management function. The policy management system 14 collects service basic information from various service systems, performs authorization verification of the service according to the policy decision of the network operator, performs a quality assurance policy and a billing policy for network bandwidth allocation, . The policy management system 14 may provide billing information to the network. The policy management system 14 can manage the charging policy.

The serving gateway 15 may be located at a lower layer closer to the user 500 than the P-GW 200a. The serving gateway 15 can provide an anchoring function between the base station and the base station, between the 3GPP network and the E-UTRAN, and between the LTE (Long Term Evolution) and the 3GPP network.

Hereinafter, the operation of each network component according to an exemplary embodiment of the present invention will be described

2 shows a block diagram of a content transmission system according to an embodiment of the present invention.

A content transmission system 10 according to an embodiment of the present invention includes a core node 100, a P-GW 200a, a billing processing and legitimate eavesdropping device 200b, a filtering device 300, a caching device 400, And the like.

Hereinafter, the components will be described in order.

The core node 100 may receive information from the caching device 400 related to the cached content being transmitted to the user terminal 500. [ The core node 100 may recognize the content transmitted from the caching device 400 to the user terminal 500 based on the information. For example, when the caching device 400 transmits the "robustness style of cy" in the full high definition (FHD) image quality to the first user terminal 500, the core node 100 transmits the information to the caching device From the caching device 400 and recognizes that the " strong Gangnam style "is transmitted from the caching device 400 to the first user terminal 500 in FHD image quality. The description of the above-described contents is only an example, and the core node 100 can receive information related to various cached contents transmitted from the caching device 400 to the user terminal 500. [

The information related to the cached content transmitted to the user terminal, which is received by the core node 100, includes at least information for identifying the content, user terminal information for transmitting the content, and information indicating that the content is the content provided by the caching apparatus One can be included. The information for identifying the content may include URL information of the content, chunk identifier information identifying the content chunk, total length information of the content, reproduction time information, name of the content, address information of the content provider providing the content, . The user terminal information on which the content is provided Identification information of the user terminal, identification information of the user, subscriber information of the user, and the like. The core node 100 may recognize the user who has received the content through the user terminal information. The information indicating that the content is the content provided by the caching device 400 may include information indicating that the content requested by the caching device 400 to the core node 100 is content already provided to the user 500 in the caching device 400 . Information related to the content may be included in an option field of a Transmission Control Protocol (TCP) header and may be transmitted from the caching device 400 to the core node 100. In addition, information related to the content may be transferred from the caching device 400 to the core node 100 through a separate protocol. In addition, the information related to the content may be included in a payload of a packet transmitted from the caching device 400 and transmitted to the core node 100. The above-described information is only an example. According to an embodiment of the present invention, the core node 100 transmits the content provided to the user 500 in the caching apparatus 400 or a packet having the same size to the user 500 To be transmitted in a downward direction.

The core node 100 can acquire a packet including the same content as the cached content transmitted to the user terminal, based on the received information. The core node 100 may obtain a packet containing the same content as the cached content transmitted to the user terminal, for example, through an external data source 13 (B). In addition, the same content as the cached content transmitted to the user terminal may be the content (A) held by the core node 100. In addition, the core node 100 may secure (C) the same content as the cached content transmitted from the original content server 12 to the user terminal. In addition, the core node 100 may acquire the same content as the cached content transmitted from the public Internet 13 to the user terminal. The content acquisition path of the core node 100 described above is merely an example and the core node 100 may have the same content as the cached content transmitted to the user terminal through various paths (i.e., various content providers (CPs)). The contents (for example, the Gangnam style of FYD image quality) can be ensured.

The core node 100 may down-stream the packet including the content so that the secured packet passes through the P-GW 200a. The downlink transmission may mean transmission from the core node toward the user terminal. According to one embodiment of the present invention as described above, even though the content transmitted from the caching apparatus to the user terminal is directly served at a lower layer of the network, the P-GW 200a may transmit the content To provide billing and legitimate eavesdropping interfaces for billing and legitimate eavesdropping. Thus, the billing processing and legal eavesdropping device 200b can perform billing and legitimate eavesdropping on the content, even though the content transmitted from the caching device to the user terminal is directly served by a lower layer of the network.

According to another embodiment of the present invention, the above-described downlink transmission can be performed by avoiding a peak time. The core node 100 does not immediately respond to the request of the caching device 400 and the packet including the content is lowered by avoiding the peak time because the packet including the above- . In this case, the core node 100 may periodicallymotorize the amount of downlink traffic. Also, according to another embodiment of the present invention, the above-described downlink transmission may be performed according to a predetermined period. As described above, since the packet including the content is a packet including contents already delivered to the user, the core node 100 can perform downlink transmission of packets including contents at regular intervals. According to another embodiment of the present invention, the above-described downlink transmission can be performed when data of a certain size is collected. For example, the information on the content transmitted to the specific user from the caching device 400 may be received, and the content related to the received information may be transmitted downward when 100 megabytes are collected. The number mentioned above is only an example, and the core node 100 can collect data of a certain size and transmit it downward in various units.

The core node 100 may mark a predetermined value in a predetermined field of a packet containing the content. The marking for a packet containing the content by the core node 100 may be performed in an option field of a Transmission Control Protocol (TCP) header of the reserved packet. Through the marking, the core node 100 may cause the lower node to recognize that the content is the content delivered from the caching device 400 to the user 500. Also, the marking may be performed by defining a separate protocol. The predetermined value may include an appropriate value that allows the lower node to recognize that the content is the content delivered from the caching device 400 to the user 500 at a lower node of the core node 100. [ The pre-determination may be a convention previously agreed upon between at least two of the caching device 400, the core node 100, the P-GW 200a, and the filter node 300. [ The above-mentioned marking scheme is merely an example, and the core node 100 can mark packets including contents in various ways.

According to another embodiment of the present invention, the core node 100 may receive the content transmitted from the caching device 400 to the user terminal 500. [ In addition, the content may be content whose predetermined value is marked in a predetermined field by the caching device 400. [ The marking may be a marking indicating that the content is content provided to the user terminal 500 from the caching device 400. The pre-decision may be a convention previously agreed upon between at least two of the caching device 400, the core node 100, the P-GW 200a, and the filter node 300. [

According to another embodiment of the present invention, the core node 100 may down-stream the received content to pass the P-GW 200a. The content is transmitted downlink from the core node 100 to pass through the P-GW 200a, and the billing process and the legitimate eavesdropping process for the content can be performed. Also, the content is marked content, at least one of the P-GW 200a and the filtering node 300 drops the content to prevent the content from being redundantly transmitted to the user terminal 500 Bandwidth usage of the backhaul link can be reduced.

The core node 100 transmits the content transmitted from the caching apparatus 400 to the user terminal 500 in the downlink so that the billing process and the legitimate tapping process for the content can be performed by the existing billing Processing and legitimate eavesdropping processing systems without changing the design of the system.

The P-GW 200a may receive a packet including the content transmitted from the core node 100. [ The packet containing the content may be the same content as the cached content transmitted to the user terminal. In addition, the P-GW 200a may also receive packets that include non-cached content. The above-mentioned packet is only an example, and the P-GW 200a can receive all kinds of packets directed to the service user 500. [

Billing processing and legitimate eavesdropping device 200b may perform a charging process and legitimate eavesdropping on packets containing the received content. The billing process and the legitimate eavesdropping process can be performed in the billing processing and legitimate eavesdropping apparatus 200b by receiving the interface for the billing processing and legitimate eavesdropping processing from the P-GW 200a. The billing process and the legitimate eavesdropping process may be performed based at least in part on the packet containing the received content and the user information. The billing process may be a billing process based on the user's network usage according to the billing policy of the data service. The charging process may be performed according to the charging policy of the Internet service provider. The billing process can be performed based on the user information and the user's network usage information. The legitimate eavesdropping process may be to examine the contents of the packet containing the content in accordance with the research purpose or the investigation request of the investigation agency as described above. The legitimate eavesdropping process may also be performed by inspecting the payload of packets containing content via DPI (Deep Packet Inspection). The aforementioned billing process is only an example, and the billing process can be performed according to various policies of the Internet service provider (ISP). Furthermore, the legitimate eavesdropping process described above is merely an example, and a legitimate eavesdropping process can be performed in various ways according to various purposes.

The P-GW 200a may determine that the packet including the received content is a packet whose predetermined value is a mark in the predetermined field. The determination may be performed in a manner that checks whether a predetermined value is marked in a predetermined field of a packet containing the received content. As described above, the predetermined field may be an optional field of a TCP header of a packet containing the content. In addition, various methods for inspecting network packets can be included in the present invention. In addition, as described above, the P-GW 200a can determine whether a packet including the received content is a marked packet through a separate protocol. If the received packet is a marked packet, the P-GW 200a can determine that the content included in the received packet is the same content as the cached content transmitted to the user terminal. When the content is transmitted to the user terminal 500, the user terminal 500 may receive the cached content, receive the content from the core node 100, and receive the same content in duplicate. Thus, the P-GW 200a may perform an additional process on the marked packet to prevent duplicate content reception of the user terminal 500 and to reduce bandwidth usage of the backhaul link. This will be described later.

The P-GW 200a may further process the packet including the received content when the packet containing the received content is determined to be a packet whose predetermined value is marked in a predetermined field. The further processing may include processing to filter the received packet, downlink the filtered packet to be dropped at a lower node, or drop the filtered packet. The filtering of the received packets may include identifying marked packets of the received packets. If the packet containing the content is a marked packet, the content of the packet containing the content is already transmitted from the caching device 400 to the user terminal 500, so that the P-GW 200a transmits the additional processing Thereby preventing redundant transmission of contents and reducing the bandwidth of the backhaul link. The filtered packet may be dropped at the P-GW 200a. In addition, the packet may be dropped in the filtering device 300, according to another embodiment of the present invention, as described below. By dropping the packet containing the marked content in the P-GW 200a, the packet containing the content to be downlinked can be filtered and dropped before reaching the user terminal.

If the P-GW 200a determines that the packet including the received content is not a packet whose predetermined value is marked in the predetermined field, the P-GW 200a may downsend the packet including the received content toward the user terminal have. If the packet including the received content is not a marked packet, the content is not a content to be repeatedly transmitted to the user terminal 500, so that the P-GW 200a transmits the packet including the received content to the user terminal 500. [ (500) direction. If the P-GW 200a is not a marked packet, the content is not transmitted to the user terminal 500 in the caching apparatus 400, 500) direction.

The billing and legitimate eavesdropping device 200b may communicate with the P-GW 200a of the EPC network. The billing process and the legitimate eavesdropping can be performed on the interface connecting the P-GW 200a and the S-GW 15 and the billing process outside the P-GW 200a and the legitimate eavesdropping device 200b ) From the P-GW 200a. The above description is merely an example and the P-GW 200a may be located between the core node 100 and the user terminal 500 and may be located at a higher layer than the caching device 400. [

The filtering device 300 may receive a packet containing the content transmitted from the P-GW 200a. The packet including the content may be a packet transmitted downward from the core node 100 toward the user terminal 500. The packet containing the content may be the same content as the cached content transmitted to the user terminal. In addition, the filtering device 300 may also receive packets that include un-cached content. The above-mentioned packet is only an example, and the filtering apparatus 300 can receive all kinds of packets destined for the service user 500. [

The filtering device 300 may determine that a packet containing the received content is a packet whose predetermined value is a marked packet in a predetermined field. The determination may be performed in a manner that checks whether a predetermined value is marked in a predetermined field of a packet containing the received content. As described above, the predetermined field may be an optional field of a TCP header of a packet containing the content. In addition, various methods for inspecting network packets can be included in the present invention. Also, as described above, the filtering apparatus 300 can determine whether a packet including the received content is a marked packet through a separate protocol. When the received packet is a marked packet, the filtering device 300 may determine that the content included in the received packet is the same content as the cached content transmitted to the user terminal. When the content is transmitted to the user terminal 500, the user terminal 500 receives the cached content, receives the content from the core node 100, and may receive the same content in duplicate. Accordingly, the filtering device 300 may drop the marked packet to prevent duplicate content reception of the user terminal 500 and to reduce bandwidth usage of the backhaul link. This will be described later.

In one aspect of the present invention, when the filtering and drop process for the marked packet is performed in the filtering device 300, the P-GW 200a may omit the process of determining whether the received packet is a marked packet have.

The filtering device 300 may filter and drop the packet including the received content when the packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field. The filtering of the received packets may include identifying marked packets of the received packets. If the packet including the content is a marked packet, the content of the packet containing the content is already transmitted from the caching device 400 to the user terminal 500, so that the filtering device 300 may include the content It is possible to prevent redundant transmission of contents and reduce the bandwidth of the backhaul link. By dropping the packet containing the marked content in the filtering device 300, the packet containing the content being downlinked can be filtered and dropped before reaching the user terminal.

In one aspect of the present invention, the filtering device 300 is an optional configuration that allows the filtering and dropping process by the filtering device 300 to be implemented when the P-GW 200a does not perform a filtering and drop process .

If the packet containing the received content is determined to be not a marked packet in the predetermined field, the filtering apparatus 300 may transmit the packet including the received content toward the user terminal . If the packet including the received content is not a marked packet, the content is not a content that is repeatedly transmitted to the user terminal 500, so that the filtering device 300 transmits the packet including the received content to the user terminal 500) direction. The filtering device 300 is not a marked packet and the content is not transmitted to the user terminal 500 in the caching device 400 so that the user terminal 500 can be normally transmitted to the user terminal 500 ) Direction.

The filtering device 300 may be located in an upper layer of the S-GW 15 for bandwidth reduction of the backhaul link. According to another embodiment of the present invention, by dropping the marked packets through the filtering device 300, only the filtering device in the conventional content delivery system is added, and the billing process according to another embodiment of the present invention And legitimate eavesdropping processes.

The caching device 400 may cache at least a portion of the predetermined content. The caching device 400 may cache the content according to a predetermined caching policy. The caching device 400 may cache, for example, multi-request content or large-volume content, etc. according to predetermined criteria for bandwidth reduction of the backhaul link. The caching device 400 according to an exemplary embodiment of the present invention can cache a part of contents in units of chunks or cache all contents. The caching device 400 can secure and cache the original of the content from the public Internet 11, the data source 13, and the content source server 12. The above-described content acquisition path is only an example, and the caching device 400 can secure the content (for example, obtain the content from the core node 100) through various paths and cache it.

The caching device 400 may receive a content transfer request message from the user terminal 500. The caching device 400 may intercept the content request from the user terminal 500 to the core node 100 or the content provider CP to receive the content request message. In this case, the caching device 400 may operate transparently between the user terminal 500 and the core node 100.

The caching device 400 may determine whether the content associated with the content transfer request message is the cached content. The caching device 400 may determine whether the requested content is cached based on information for identifying the content. The information for identifying the content may include URL information of the content, chunk identifier information identifying the content chunk, total length information of the content, reproduction time information, name of the content, address information of the content provider providing the content, . The caching device 400 may compare the content identification information included in the content request with the identification information of the cached content to determine whether the content is cached.

The caching device 400 may transmit the cached content to the user terminal if the content related to the content transmission request message is determined as the cached content (cache hit).

The caching device 400 may be configured to send the core node 100 to the user terminal in order to allow the core node 100 to downlink the packets containing the same content as the content sent to the user terminal, To the core node 100, information related to the cached content. The caching device 400 is located at a lower level than the P-GW 200a and the content transmitted directly from the caching device 400 to the user terminal 500 is difficult to charge and legally intercept. The caching device 400 may allow the core node 100 to downlink the packet including the same content as the content transmitted to the user terminal. Accordingly, even though the caching apparatus 400 is located at a lower level than the P-GW 200a, it is possible to perform billing processing and legitimate tapping of the contents transmitted from the caching apparatus 400. [ The information related to the cached content transmitted to the user terminal may include at least one of information for identifying the content, user terminal information on which the content is transmitted, and information indicating that the content is content provided at the cache node . The information associated with the cached content transmitted to the user terminal is as described above. In addition, according to another embodiment of the present invention, the caching apparatus 100 may transmit information related to cached contents transmitted to the user terminal to the core node 100 while avoiding a peak time. Since the content is already transmitted to the user, the caching device 400 does not need to cause the core node 100 to immediately transmit the content downward, so that the core node 100 avoids the peak time, Lt; / RTI > Also, according to another embodiment of the present invention, the caching apparatus 400 may transmit information related to the cached contents transmitted to the user terminal to the core node 100 according to a predetermined period. According to another embodiment of the present invention, when the cached content transmitted to the user terminal becomes a predetermined size, the caching device 400 transmits information about the cached contents to the user terminal, 100). For example, when a specific user receives a music video of Cy Young's Gangnam style (31 MB) and Girls 'Generation Girls' Generation (69 MB) from the caching device, when the content received by the particular user becomes 100 MB, 400 may transmit information related to the Gangnam style of the cached song and the Girls' Generation music video to the core node 100. The size of the content and the content are only examples, and the caching device 400 may integrate the content transmission details of the caching device 400 in various sizes and transmit the information related to the cached content, which is transmitted to the user terminal, ).

The caching device 400 according to an embodiment of the present invention may be located at an edge node (EN). The caching device 400 may also be located at the base station eNB. The above-mentioned position is only an example, and the caching device 400 may be located in a layer close to the user terminal 500, in order to reduce the transmission of the content.

According to another embodiment of the present invention, the caching device 400 may send the core node 100 to the user terminal 500 in order to allow the core node 100 to transmit the same content as the content transmitted to the user terminal And send the cached content to the core node 100. Further, in accordance with another embodiment of the present invention, the caching device 400 may mark a predetermined value in a predetermined field of the content and transmit it to the core node 100. [ The caching device 400 may mark the content and send it to the core node 100, thereby preventing the content from being transmitted to the user terminal 500 in a redundant manner, thereby reducing bandwidth usage. The predetermined field may be an optional field of the TCP header. The pre-decision may be a convention previously agreed upon between at least two of the caching device 400, the core node 100, the P-GW 200a, and the filter node 300. [

According to another embodiment of the present invention, the caching device 400 may branch the content transmitted to the user terminal 500 and transmit the content to the core node 100. [ The caching device 400 may branch the content to be transmitted to the user terminal and allow the core node 100 to perform an immediate billing process and legitimate tapping of the content.

In addition, the caching device 400 may transmit the content transmitted to the user terminal 500 to the core node 100 according to a predetermined period. The predetermined period may be a unit of seconds, minutes, hours, etc., and the time unit described above is an example, and various times may be a content transmission period for the core node 100. [ In addition, the caching device 400 may transmit the content sent to the user terminal 500 to the core node 100 based on whether or not a predetermined content transmission amount threshold is reached. The caching device 400 may count the amount of content transmitted to the user terminal 500 and may transmit the content to the core node 100 when the amount of transmission reaches a predetermined content transmission amount threshold. The caching device 400 transmits the content sent to the user terminal 500 to the core node 100 based on whether the content reaches the predetermined period or a predetermined content transmission amount threshold so that the resource usage of the caching device 400 Can be saved.

Also, the caching device 400 may transmit the content transmitted to the user terminal 500 to the core node 100, avoiding a peak time. The caching device 400 can transmit content to the core node 100 while avoiding peak time, thereby reducing network congestion due to bandwidth usage for billing and legitimate eavesdropping. In this case, the caching device 400 may periodically monitor the amount of traffic communicating with the core node 100.

3 shows a block diagram of a core node according to an embodiment of the present invention.

The core node 100 according to an exemplary embodiment of the present invention may include a receiving module 110, a packet obtaining module 130, a transmitting module 150, and a controlling module 170.

The receiving module 110 includes a public Internet 11, a content source server 12, a data source 13, a P-GW 200a, a caching device 400, a user terminal 500, Lt; RTI ID = 0.0 > and / or < / RTI > The receiving module 110 may include a wired / wireless Internet module for network connection. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies. Wired Internet technologies include XDSL (Digital Subscriber Line), FTTH (Fiber to the home), and PLC (Power Line Communication). The receiving module 110 may receive, from the caching device 400, information related to the cached content being transmitted to the user terminal, in accordance with an embodiment of the present invention. The information related to the cached content is as described above. Also, according to another embodiment of the present invention, the receiving module 110 may receive the marked content transmitted from the caching device 400 to the user terminal.

The packet acquisition module 130 may generate a packet including the same content as the cached content transmitted to the user terminal, based on the received information. The packet acquisition module 130 can secure the content source based on the information related to the cached content. The content acquisition method performed by the core node 100 has been described above. The packet acquisition module 130 may also mark a predetermined value in a predetermined field of a packet containing the content. This has been described above. Further, in accordance with another embodiment of the present invention, the operation of marking a predetermined value in a predetermined field of a packet containing the content may be performed in the control module 170. This has been described above. In addition, the packet acquisition module 130 may include a wired / wireless Internet module for network connection to secure a content source.

The transmission module 150 may transmit information to a lower layer of the core node 100. The transmission module 150 may down-stream a packet containing the content so that a packet containing the content passes through the P-GW 200a, according to an embodiment of the present invention. According to one embodiment of the invention, the packet containing the content may be a marked packet. The transmission module 150 may include a wired / wireless Internet module for network connection.

The control module 170 may control the overall operation of the core node 100. Also, as described above, the control module 170 may mark the predetermined value in a predetermined field of the packet containing the secured content. The control module 170 may execute a software code and a programming language.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays May be implemented using at least one of a processor, controllers, micro-controllers, microprocessors, and other electronic units for performing other functions. In some cases, The embodiments described may be implemented by the control module 170 itself.

4 shows a block diagram of a P-GW according to an embodiment of the present invention.

The P-GW may include a receiving module 210, a billing interface 230, a legitimate intercepting interface 250, a control module 270, and a transmission module 290.

The receiving module 210 may include a wired / wireless Internet module for network connection. The receiving module 210 may receive a packet including the content transmitted from the core node 100, according to an embodiment of the present invention. The packet containing the content may be a packet containing the same content as the cached content being transmitted to the user terminal. In addition, the content may be the marked content received from the caching device 400 by the core node 100. In addition, the receiving module 210 can receive all kinds of packets transmitted from the core node 100 downward.

The billing interface 230 is configured to provide a billing process and an interface for billing processing to the legitimate eavesdropping device 200b so that the billing process and the legal eavesdropping device 200b can perform the billing process for the packet including the received content, Can be provided. The charging process can be performed according to the policy of the Internet service provider. The billing process is as described above.

The legitimate eavesdropping module 250 performs a legitimate eavesdropping process on the charging and legal eavesdropping device 200b so that the charging process and the legitimate eavesdropping device 200b can perform the legitimate eavesdropping process on the packet containing the received content Lt; / RTI > interface. Legitimate eavesdropping can refer to the process of analyzing content usage and the process of legitimately intercepting the contents of a packet by requesting investigation by the investigation agency. Regarding legal interception, as described above.

The control module 270 may determine that a packet containing the received content is a packet whose predetermined value is a marked value in a predetermined field. Concrete determination methods are as described above. In addition, the pre-determination may be a convention previously agreed upon between at least two of the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400 as described above. Also, the control module 270 can control the overall operation of the P-GW 200a. If the packet containing the received content is a packet whose predetermined value is marked in the predetermined field as described above, the control module 270 transmits the content to the user terminal 500, . ≪ / RTI > The control module 270 may determine whether to perform an additional process or a downward transmission depending on whether a packet including the received content is marked. The additional process is as described above. The control module 270 may decide to drop the marked packet to prevent duplicate transmission of the content, thereby reducing bandwidth usage of the backhaul link.

In a further aspect of the invention, the filtering module 270 in the P-GW 200a may be omitted if the filtering and dropping process is implemented by a child node (e.g., a filtering device).

The transmission module 290 may include a wired / wireless Internet module for network connection. The transmission module 290 may downlink the received packet toward the user terminal if the packet including the received content is not a packet whose predetermined value is marked in the predetermined field. Alternatively, the transmission module 290 may determine whether the received packet is marked or not, and may automatically forward the packet received to the lower node when the accounting process for the received packet is completed. If the packet including the received content is not a marked packet, the transmission module 290 does not perform the additional process and transmits the packet to the user terminal 500 And downlink toward the terminal 500.

5 shows a block diagram of a filtering apparatus according to an embodiment of the present invention.

The filtering device may include a receiving module 310, a control module 330, and a transmitting module 350.

The receiving module 310 may include a wired / wireless Internet module for network connection. The receiving module 310 may receive a packet including the content transmitted from the core node 100, according to an embodiment of the present invention. The packet containing the content may be a packet containing the same content as the cached content being transmitted to the user terminal. Also, the receiving module 310 can receive all kinds of packets transmitted from the P-GW 200a downward.

The control module 330 may determine whether a packet containing the received content is a packet whose predetermined value is a marked value in a predetermined field. Concrete determination methods are as described above. In addition, the pre-determination may be a convention previously agreed upon between at least two of the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400 as described above. In addition, the control module 330 may control the overall operation of the filtering device 300. If the packet containing the received content is a packet whose predetermined value is marked in a predetermined field as described above, the control module 330 transmits the content to the user terminal 500, which is transmitted from the caching device 400 to the user terminal 500 . ≪ / RTI > The control module 330 may determine whether to downlink according to whether the packet including the received content is marked or not. The control module 330 may decide to filter and drop the packet containing the received content if the packet containing the received content is determined to be a pre-determined value marked packet in a predetermined field have. The control module 330 may decide to drop the marked packet to prevent duplicate transmission of the content, thereby reducing bandwidth usage of the backhaul link.

The transmission module 350 may include a wired / wireless Internet module for network connection. The transmission module 350 may downlink the received packet toward the user terminal when it is determined that the packet including the received content is not a packet whose predetermined value is marked in the predetermined field. As described above, when the packet including the received content is not a marked packet, the transmission module 350 does not perform the additional process, To the user terminal (500).

The filtering device 300 is optionally configured such that the filtering device 300 may be omitted if a filtering and drop process for the packet is implemented by an ancestor node (e.g., P-GW 200a).

6 shows a block diagram of a caching device according to an embodiment of the present invention.

The caching device 400 may include a caching module 410, a control module 430, and a transmission module 450.

The caching module 410 may cache at least a portion of the predetermined content. The caching device 410 may cache at least a portion of the (many) requested content that is determined to be cached. The caching module 410 may include a storage space for storing content. In addition, the caching module 410 may include a network module for securing contents in case of a cache miss. Concrete contents securing methods are as described above. In addition, the caching module 410 may transparently intercept the content request of the user 500. The caching module 410 performs an overall caching operation, as described above.

The control module 430 may control the overall operation of the caching device 400. [ The control module 430 may determine whether the content associated with the content request message from the user terminal is the cached content. The method for determining whether the requested content from the user terminal is cached is as described above.

The control module 430 may also be configured to cause the cached content that is sent to the core node 100 to be filtered and dropped before reaching the user terminal 500 from the core node 100 in accordance with another embodiment of the present invention. A predetermined value in the predetermined field of the content may be marked. This is the same as described above.

The transmission module 450 may include a wired / wireless Internet module for network connection. When the content related to the content transmission request message is determined as the cached content, the transmission module 450 transmits the content cached to the user terminal, and transmits the cached content to the core node 100, To the core node 100, information related to the cached content to be transmitted to the user terminal in order to permit downlink transmission of a packet including the same content as the content. The information related to the cached content is as described above.

In order to allow the core node 100 to transmit a packet including the same content as the content transmitted to the user terminal 500 in the downlink according to another embodiment of the present invention, To the core node 100, the cached content transmitted to the user terminal 500. This is the same as described above.

In addition, if the content related to the content transmission request message is not the cached content, the transmission module 450 may transmit the content request message to the upper node in order to secure the content.

7 shows a flowchart of a content transmission method according to an embodiment of the present invention.

Each step of the flowchart included in FIG. 7 is not essential and some steps may be added or omitted as needed.

The user terminal 500 may request the content to the caching device 400 (601). The content request may be sent from the user terminal 500 to the core node 100 (or the content provider CP). The caching device 400 may (transparently) intercept the content request.

The caching device 400 may determine whether the requested content is cached content (602). This has been described above.

The caching device 400 may transmit the cached content to the user terminal 500 if the requested content is cached (cache hit) (603). Also, although not shown in the figure, the caching device 400 may transmit a request for the content to an upper node if the requested content is non-cached content (cache miss).

The caching device 400 may be configured to send the core node 100 to the user terminal in order to allow the core node 100 to downlink the packets containing the same content as the content sent to the user terminal, (604) the information associated with the cached content to the core node. The information related to the cached content transmitted to the user terminal includes at least one of information for identifying the content, user terminal information on which the content is transmitted, and information indicating that the content is content provided to the cache node, as described above can do. According to another embodiment of the present invention, the caching apparatus 400 may transmit information related to the cached contents transmitted to the user terminal to the core node 100 without a peak time. Also, as described above, according to another embodiment of the present invention, the caching device 400 may transmit information related to the cached contents transmitted to the user terminal to the core node 100 at regular intervals. The caching device 400 may also transmit information associated with the cached content to the user terminal 500 to the core node 100 when the amount of information satisfies a predetermined threshold.

Based on the received information, the core node 100 can acquire a packet including the same content as the cached content transmitted to the user terminal (605). A concrete method for securing a packet including the same content as the cached content transmitted to the user terminal is as described above.

The core node 100 may mark a predetermined value in a predetermined field of a packet containing the content (606). The predetermined field may be an optional field of the TCP header. It is also described above that the core node 100 can mark packets containing the contents in various ways. In addition, the pre-determination may be a convention previously agreed upon between at least two of the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400 as described above.

The core node 100 may downlink the packet including the content (607). The core node 100 may downlink the packet including the content to allow the packet to pass through the P-GW 200a. As described above, the core node 100 may perform the downlink transmission either by avoiding the peak time or by a predetermined period or when a certain criterion is satisfied (for example, when the capacity criterion is satisfied).

The P-GW 200a may provide an interface for billing and legitimate interception of packets containing the received content (608). This has been described above.

The P-GW 200a may determine 609 whether the packet containing the received content is a predetermined value marked packet in a predetermined field. This has been described above.

If the P-GW 200a determines that the packet is a marked packet, the P-GW 200a may filter the received packet and drop the filtered packet (610). This has been described above. And the P-GW 200a may drop the packet, and the packet including the down-stream content may be filtered and dropped before reaching the user terminal. Therefore, the P-GW 200a can reduce the bandwidth usage of the backhaul link.

If the P-GW 200a is not a marked packet, the P-GW 200a may downlink (611). If the packet is not a marked packet, it is a packet that is normally transmitted, not a duplicated packet. Therefore, the billing process and the legitimate eavesdropping device 200a transmit the packet to the user terminal 500. [

8 shows a flowchart of a content transmission method according to another embodiment of the present invention.

The steps 701 to 703 of FIG. 8 are the same as the steps 601 to 603 of FIG. The steps 706 to 710 of FIG. 8 are the same as the steps 607 to 611 described in FIG.

The caching device 400 may be configured to provide a pre-determined field to be filtered and dropped before the content reaches the user terminal 500 from the core node 100 to the content transmitted to the core node, according to one embodiment of the present invention. The determined value may be marked 704. The marking is as described above. The content may be the same content as the cached content sent to the user terminal. In addition, the caching device 400 may mark a predetermined value in the determined field of the content.

The caching device 400 may be configured to allow the core node 100 to send the marked content to the core (s) in order to allow the core node 100 to send downward packets containing the same content as the content sent to the user terminal, To the node 100 (705).

9 shows a flowchart of a content transmission method according to an embodiment of the present invention. Each step of the flowchart included in FIG. 9 is not essential and some steps may be added or omitted as needed.

The steps 801 to 809 described in FIG. 9 are the same as steps 601 to 609 described in FIG. The step 812 shown in FIG. 9 is the same as the step 611 shown in FIG. 7, so the detailed description is based on the above description.

If the received packet is determined to be a marked packet, the P-GW 200a may filter the received packet and transmit the filtered packet downward so as to drop the packet at a lower node (810). The lower node may include a filtering device 300.

The filtering device 300 may filter 811 the packet containing the content if the received packet is a marked packet. This has been described above. By filtering and dropping the packets in the filtering device 300, packets containing downlink content can be filtered and dropped before reaching the user terminal. Therefore, the filtering apparatus 300 can reduce the bandwidth usage of the backhaul link.

10 shows a flowchart of a content transmission method according to another embodiment of the present invention. Each step of the flowchart included in FIG. 10 is not essential and some steps may be added or omitted as needed.

The steps 901 to 908 described in FIG. 10 are the same as steps 701 to 708 described in FIG. The step 811 shown in FIG. 8 is the same as the step 610 shown in FIG. 7, so the detailed description is based on the above description.

If the P-GW 200a determines that the received packet is a marked packet, the P-GW 200a may filter the received packet and transmit the filtered packet downward so that it can be dropped at the lower node (909). The lower node may include a filtering device 300.

The filtering device 300 may filter 910 the packet containing the content if the received packet is a marked packet. This has been described above. By filtering and dropping the packets in the filtering device 300, packets containing downlink content can be filtered and dropped before reaching the user terminal. Therefore, the filtering apparatus 300 can reduce the bandwidth usage of the backhaul link.

Those of ordinary skill in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced in the above description may include voltages, currents, electromagnetic waves, magnetic fields or particles, Particles or particles, or any combination thereof.

Those skilled in the art will appreciate that the various illustrative logical blocks, modules, processors, means, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be embodied directly in electronic hardware, (Which may be referred to herein as "software") or a combination of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the design constraints imposed on the particular application and the overall system. Those skilled in the art may implement the described functionality in various ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The various embodiments presented herein may be implemented as a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" includes a computer program, carrier, or media accessible from any computer-readable device. For example, the computer-readable medium can be a magnetic storage device (e.g., a hard disk, a floppy disk, a magnetic strip, etc.), an optical disk (e.g., CD, DVD, etc.), a smart card, But are not limited to, devices (e. G., EEPROM, cards, sticks, key drives, etc.). The various storage media presented herein also include one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" includes, but is not limited to, a wireless channel and various other media capable of storing, holding, and / or transferring instruction (s) and / or data.

It will be appreciated that the particular order or hierarchy of steps in the presented processes is an example of exemplary approaches. It will be appreciated that, based on design priorities, certain orders or hierarchies of steps in processes may be rearranged within the scope of the present invention. The appended method claims provide elements of the various steps in a sample order, but are not meant to be limited to the specific order or hierarchy presented.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

DETAILED DESCRIPTION OF THE INVENTION

As described above, relevant contents have been described in the best mode for carrying out the invention.

The present invention can be used for mobile caching technology and the like.

Claims (29)

A content transmission method performed by a core node (CN)
The method comprising: receiving information related to cached content transmitted to a user terminal from a caching device;
Acquiring, based on the received information, a packet including the same content as the cached content transmitted to the user terminal; And
Transmitting a packet including the content so that the secured packet passes through a P-GW (PDN Gateway);
/ RTI >
How to transfer content. The method according to claim 1,
Marking a predetermined value in a predetermined field of a packet containing the content;
Further comprising:
Wherein the predetermined field comprises:
And an option field of a Transmission Control Protocol (TCP) header of the secured packet.
How to transfer content. The method according to claim 1,
Wherein the packet including the down-
Wherein the user terminal is filtered and dropped before reaching the user terminal.
How to transfer content. The method according to claim 1,
The caching device includes a caching device located at an edge node (EN)
How to transfer content. A content transmission method, performed by a P-GW,
Receiving a packet including content transmitted from a core node;
Providing an interface for a billing process and a legitimate eavesdropping process for a packet containing the received content;
Determining whether a packet including the received content is a predetermined value marked packet in a predetermined field;
Further processing a packet including the received content if the packet containing the received content is determined to be a marked packet with a predetermined value in a predetermined field; And
Transmitting a packet including the received content to a user terminal when the packet including the received content is determined not to be a predetermined value marked packet in a predetermined field;
/ RTI >
How to transfer content. 6. The method of claim 5,
Further processing the packet including the received content comprises:
Filtering the received packet; And
Dropping the filtered packet;
/ RTI >
How to transfer content. A content transmission method, performed by a filtering device,
Receiving a packet including content transmitted from the P-GW;
Determining whether a packet including the received content is a predetermined value marked packet in a predetermined field;
Filtering and dropping a packet including the received content when a packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field; And
Transmitting a packet including the received content to a user terminal when the packet including the received content is determined not to be a predetermined value marked packet in a predetermined field;
/ RTI >
How to transfer content. A content transfer method, performed by a caching device,
Caching at least a portion of the predetermined content;
Receiving a content transmission request message from a user terminal;
Determining whether the content associated with the content transfer request message is the cached content;
Transmitting the cached content to the user terminal when the content related to the content transmission request message is determined as the cached content; And
Transmitting, to the core node, information related to the cached content transmitted to the user terminal, in order to allow the core node to downlink the packet including the same content as the content transmitted to the user terminal;
/ RTI >
How to transfer content. 9. The method of claim 8,
The information related to the cached content, which is transmitted to the user terminal,
Wherein the content includes at least one of information for identifying the content, user terminal information on which the content is transmitted, and information indicating that the content is content provided at a cache node.
How to transfer content. As a core node,
A receiving module for receiving information related to cached contents transmitted from the caching device to the user terminal;
A packet acquisition module for generating a packet including the same content as the cached content transmitted to the user terminal based on the received information; And
A transmission module for down-streaming a packet including the content so that a packet containing the content passes through the P-GW;
/ RTI >
Core node. As the P-GW,
A receiving module for receiving a packet including content transmitted from a core node;
A billing interface for providing an interface for billing for packets containing the received content;
A legitimate eavesdropping interface for providing an interface for legitimate eavesdropping on packets containing the received content;
A control module for determining whether a packet containing the received content is a predetermined value marked packet in a predetermined field and for processing the received packet if the received packet is determined to be a marked packet; And
A transmission module for downlinking the received packet toward a user terminal when the packet including the received content is not a packet marked with a predetermined value in a predetermined field;
/ RTI >
P-GW. As a filtering device
A receiving module for receiving a packet including content transmitted from the P-GW;
When a packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field, and when a packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field, A control module for deciding to filter and drop a packet containing the received content; And
A transmission module for transmitting a packet including the received content to a user terminal in a downward direction when it is determined that the packet including the received content is not a predetermined value marked packet in a predetermined field;
/ RTI >
Filtering device. As a caching device,
A caching module for caching at least a portion of the predetermined content;
A control module for determining whether the content associated with the content transmission request message from the user terminal is the cached content; And
When the content related to the content transmission request message is determined to be the cached content, transmitting the cached content to the user terminal, and transmitting, by the core node, a packet including the same content as the content transmitted to the user terminal A transmission module for transmitting to the core node information related to the cached content transmitted to the user terminal to permit downlink transmission;
/ RTI >
Caching device. A content delivery system,
A caching device for transmitting the cached content to the user terminal in response to a transmission request for the content from the user terminal and transmitting information related to the content transmitted to the user terminal to the core node; And
A core node for securing a packet including the same content as the content based on the information related to the content and transmitting the packet including the secured content to the P-GW;
/ RTI >
Content delivery system. 15. The method of claim 14,
The method comprising: providing an interface for billing and legitimate interception of a packet including the downlink content, determining whether a packet including the content is a marked packet, dropping the marked packet if the packet is a marked packet P-GW;
≪ / RTI >
Content delivery system. 15. The method of claim 14,
A P-GW for providing an interface for billing and legitimate interception of packets including the downlinked content, and for transmitting packets containing the contents to a filter node; And
A filter node for determining whether a packet including the content received from the P-GW is a marked packet, and dropping the marked packet if the packet is a marked packet;
≪ / RTI >
Content delivery system. A content transfer method, performed by a caching device,
Caching at least a portion of the predetermined content;
Receiving a content transmission request message from a user terminal;
Determining whether the content associated with the content transfer request message is the cached content;
Transmitting the cached content to the user terminal when the content related to the content transmission request message is determined as the cached content; And
Transmitting the cached content sent to the user terminal to the core node to allow the core node to transmit the same content as the content sent to the user terminal;
/ RTI >
How to transfer content. 18. The method of claim 17,
Marking the content to be filtered and dropped before the cached content sent to the core node arrives from the core node to the user terminal;
≪ / RTI >
How to transfer content. 19. The method of claim 18,
Wherein the marking is a marking performed in an optional field of a TCP header,
How to transfer content. 18. The method of claim 17,
Wherein the transmitting to the core node comprises:
A step of branching the content to be transmitted to the user terminal and transmitting the content to the core node, transmitting based on a predetermined period, avoiding a peak time, and reaching a predetermined content transmission amount threshold The method comprising the steps < RTI ID = 0.0 > of: <
How to transfer content. A content delivery method performed by a core node,
Receiving the marked content transmitted to the user terminal from the caching device; And
Transmitting the content downward so that the received content passes through the P-GW;
/ RTI >
How to transfer content. As a caching device,
A caching module for caching at least a portion of the predetermined content;
A control module for determining whether the content associated with the content transmission request message from the user terminal is the cached content; And
When the content related to the content transmission request message is determined to be the cached content, transmitting the cached content to the user terminal, and transmitting, by the core node, a packet including the same content as the content transmitted to the user terminal A transmission module for transmitting the cached contents sent to the user terminal to the core node to permit downlink transmission;
/ RTI >
Caching device. 22. The method of claim 22,
A control module that marks the content to be filtered and dropped before the cached content transmitted to the core node arrives from the core node to the user terminal;
/ RTI >
Caching device. As a core node,
A receiving module for receiving the marked content transmitted from the caching device to the user terminal; And
A transmission module for down-transmitting the content so that the received content passes through the P-GW;
/ RTI >
Core node. A content delivery system,
A caching device for transmitting the cached content to the user terminal in response to a transmission request for the content from the user terminal and transmitting the content transmitted to the user terminal to the core node; And
A core node receiving the content and down-transmitting the content so that the received content passes through the P-GW;
/ RTI >
Content delivery system. 26. The method of claim 25,
A caching device that marks the content to be filtered and dropped before the cached content sent from the caching device to the core node arrives from the core node to the user terminal,
/ RTI >
Content delivery system. 27. The method of claim 26,
A P-GW for providing an interface for billing and legal interception of the downlinked content, determining whether the content is marked content, and dropping the marked packet if the content is marked;
≪ / RTI >
Content delivery system. 27. The method of claim 26,
A P-GW for providing an interface for billing and legal interception of the downlinked content and for transmitting the content to a filter node; And
A filter node for determining whether the content received from the P-GW is marked content, and dropping the marked packet if the content is marked;
≪ / RTI >
Content delivery system. 21. A computer readable medium comprising computer program code for performing the method of any one of claims 1 to 9 and 17 to 21.

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