WO2016085013A1 - Contents transmission system for processing billing and providing lawful interception through original contents filtering - Google Patents

Abstract

Disclosed is a contents transmission system capable of performing billing and lawful interception of contents which are transmitted from a caching apparatus to a user terminal. The contents transmission system may comprise: a caching apparatus for transmitting cached corresponding information to a user terminal in response to a transmission request of contents from the user terminal, and transmitting information related to the contents transmitted to the user terminal to a core node; and a core node for securing, on the basis of the information related to the contents, a packet including the same contents as the contents, and downlink transmitting the packet including the secured contents to an apparatus for billing processing and lawful interception.

Description

Content delivery system that provides billing processing and legal interception through content source filtering

The present invention relates to content transmission that is transparent to billing and legal interception in LTE networks, and more particularly, a billing system process and a legal interception system while maintaining functions that a cache system installed in a mobile network can provide to network operators and users. It involves the transmission of content in a way that is transparent to the process.

Recently, users of mobile portable devices such as smartphones and tablets have exploded. In addition, as the performance of the user terminal is improved and the mobile communication technology is developed, the consumption of large-capacity and high-definition content is rapidly increasing in mobile devices.

Therefore, since the number of web servers that a content provider (CP) can provide is limited, the data loss due to the rapidly increasing number of users and the size of the content capacity, and the delay of data transmission, and / Alternatively, instability may occur in data transmission such as data truncation.

Under these circumstances, when content is placed in close proximity to a user's terminal, seamless service, improved user's speed, reduced use of resources (resources) in the network such as bandwidth reduction of mobile network operators, mobile content delivery network (CDN) Profitability business such as Content Delivery Network can be enabled.

The technique for placing content in a location proximate such a user terminal is referred to as mobile caching technology. Mobile caching technology is a major point on the network (e.g., a large amount of content or frequently requested content such as images, video, audio, etc.) located in a web server of a content provider (CP) located remotely from a user terminal. Copy and store some or all of them in advance in a cache device disposed near the user terminal, and when a content request from the user terminal is received, the cache device located closest to the user terminal responds thereto. By transmitting the content from the user terminal to the user terminal, the technology can improve the access speed of the user terminal and provide a more stable content.

Since such a mobile caching system has various advantages as described above, it is currently used in the majority of networks as a means to solve the constant demand for network transmission speed of users.

In addition, unlike conventional wired systems, mobile caching systems that implement mobile caching technology must comply with the requirements of operators in the network such as handover or handoff, billing system, and lawful interception.

However, the mobile caching system enables stable and efficient data transmission, while the content provided by the mobile caching system is directly serviced at a lower layer in the network. And problems related to legal interception.

Accordingly, there is a need in the art for an efficient technique related to billing processing and legal interception in such caching systems. Korean Patent Laid-Open Publication No. 10-200a9-0128847 discloses techniques related to billing processing in a caching system.

SUMMARY OF THE INVENTION The present invention is directed to a content delivery system for efficiently charging and legally intercepting content provided by a caching apparatus, which is devised in response to the background art described above.

According to an embodiment of the present invention for realizing the above-described problem, a content delivery 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 apparatus, based on the received information, to secure a packet including the same content as the cached content transmitted to the user terminal. And transmitting downlink a packet including the content so that the secured packet passes through a P-GW (PDN Gateway).

According to an embodiment of the present invention for realizing the above-described problem, a content delivery method performed by the P-GW is disclosed. The method comprises the steps of: receiving a packet comprising content transmitted from a core node, providing a charging process for the packet containing the received content and an interface for legal interception; Determining whether a predetermined value in a predetermined field is a marked packet, 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 if it is determined that the packet including the received content is not a packet marked with a predetermined value in a predetermined field, transmitting the packet including the received content downward toward the user terminal. It may include.

According to an embodiment of the present invention for realizing the above-described problem, a content transmission method performed by a filtering device is disclosed. The method comprises the steps of receiving a packet comprising content transmitted from a P-GW and determining whether a packet comprising the received content is a packet marked with a predetermined value in a predetermined field. If the packet is determined to be a packet marked with a predetermined value in the predetermined field, filtering and dropping the packet including the received content, and determining a predetermined value in the field in which the packet containing the received content is predetermined. If it is determined that the packet is not marked, it may include transmitting a packet including the received content downward toward the user terminal.

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

In addition, a core node for providing content delivery is disclosed in accordance with one embodiment of the present invention. The core node transmits to the user terminal based on at least one of the information related to the cached content transmitted to the user terminal and at least one of the content from the caching apparatus, the received information and the content. And a packet obtaining module for generating a packet including the same content as the cached content, and a transmitting module for transmitting a packet including the content downward so that the packet including the content passes through the P-GW.

In addition, P-GW (PDN Gateway) for providing content delivery according to an embodiment of the present invention is disclosed. The P-GW includes a receiving module for receiving a packet including content transmitted from a core node, a charging processing interface for providing an interface for charging the packet including the received content, and the received content. A legal interception interface providing an interface for legal interception of a packet to be determined, determining whether a packet including the received content is a packet marked with a predetermined value in a predetermined field, and receiving the packet as a marked packet If it is determined, if the control module for further processing the received packet and the packet including the received content is not a packet marked with a predetermined value in a predetermined field, the received packet is transmitted downward toward the user terminal It may include a transmission module.

In addition, a filtering apparatus for providing content delivery according to an embodiment of the present invention is disclosed. The apparatus includes 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, and including the received content. If the packet is determined to be a packet marked with a predetermined value in the predetermined field, the control module for determining to filter and drop the packet including the received content and the packet containing the received content is a predetermined field If it is determined that the predetermined value is not the marked packet in the, it may include a transmission module for transmitting the packet including the received content down to the user terminal direction.

In addition, a caching apparatus for providing content delivery is disclosed in accordance with one embodiment of the present invention. The apparatus includes a caching module for caching at least a portion of predetermined content, a control module for determining whether the content associated with a content transfer request message from a user terminal is the cached content and the content associated with the content transfer request message includes: If determined to be cached content, transmit the cached content to the user terminal, and allow the core node to transmit a packet containing the same content as the content transmitted to the user terminal downlink to the user terminal. And a transmission module for transmitting at least one of the information related to the cached content and the content to be transmitted to the core node.

Additionally, a content delivery system for providing content delivery is disclosed in accordance with one embodiment of the present invention. The system transmits the cached corresponding content to the user terminal in response to a request for transmission of the content from the user terminal, and transmits at least one of the information related to the content and the content transmitted to the user terminal to the core node. A core that secures a packet including the same content as the content and transmits the packet including the secured content to the P-GW based on at least one of the caching apparatus and the information related to the content and the content It can include a node.

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

Disclosed is a content transmission method performed by a caching apparatus according to another embodiment of the present invention. The method includes caching at least a portion of predetermined content, receiving a content transfer request message from a user terminal, determining whether the content associated with the content transfer request message is the cached content, the content If the content related to the delivery request message is determined as the cached content, transmitting the cached content to the user terminal and transmitting a packet including the same content as the content transmitted to the user terminal by a core node to the user terminal; In order to allow the request, the method may include transmitting the cached content transmitted to the user terminal to the core node.

In accordance with another embodiment of the present invention, a content delivery method performed by a core node is disclosed. The method may include receiving marked content sent to a user terminal from a caching device and transmitting the content downward such that the received content passes through a P-GW.

A caching apparatus for providing content delivery is disclosed in accordance with another embodiment of the present invention. The apparatus includes a caching module for caching at least a portion of predetermined content, a control module for determining whether the content associated with a content transfer request message from a user terminal is the cached content and the content associated with the content transfer request message includes: If determined to be cached content, transmit the cached content to the user terminal, and allow the core node to transmit a packet containing the same content as the content transmitted to the user terminal downlink; And a transmission module for transmitting the cached content transmitted to the core node.

In accordance with another embodiment of the present invention, a core node for providing content delivery is disclosed. The apparatus may include a receiving module for receiving the marked content transmitted to the user terminal from the caching device and a transmitting module for transmitting the content downward so that the received content passes through the P-GW.

In accordance with another embodiment of the present invention, a content delivery system for providing content delivery is disclosed. The system, in response to a request for transmission of content from a user terminal, transmits the cached corresponding content to the user terminal, and receives the caching apparatus and the content for transmitting the content transmitted to the user terminal to a core node. And a core node for transmitting the content downward so that the received content passes through the P-GW.

According to the present invention, it is possible to provide a content delivery system for efficiently charging and legally intercepting content provided by a caching apparatus.

1 is a block diagram of a general content delivery system.

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

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

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

5 is a block diagram of a filtering device according to an embodiment of the present invention.

6 illustrates a block diagram of a caching apparatus according to an embodiment of the present invention.

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

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

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

10 is a flowchart illustrating a content transmission method according to another embodiment of the present invention.

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In this specification, various descriptions are presented to provide an understanding of the present invention. It is evident, 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.

As used herein, the terms “component”, “module”, “system” and the like refer to computer-related entities, hardware, firmware, software, a combination of software and hardware, or the execution of software. For example, a component may be, but is not limited to being, a process running on a processor, a processor, an object, an thread of execution, a program, and / or a computer. For example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a processor and / or thread of execution, and a component can be localized within one computer or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may for example be signals having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and / or data via a network such as the other system and the internet via signals and / or signals). May communicate via local and / or remote processes.

The description of the presented 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 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 should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

Also, as used herein, the terms “process” and “process” can often be 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 delivery system.

The conventional content delivery system includes a core node (CN, Core node, 100), a P-GW (PDN gateway, 200a), a billing and legal interception apparatus (200b), a serving gateway (S-GW, Serving gateway, 15), a policy. It may include a management system (PCRF, 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, also called a core network, is a high-speed backbone network of a large communication network capable of large-capacity long distance voice and data services, a general switched telephone network (PSTN), an integrated information network (ISDN), a wide area network (WAN), It may include a local area network (LAN), comprehensive cable broadcasting (CATV), and the like. The content may be serviced to the client via the core node 100. The core node 100 may obtain content from various content providers (CPs) such as the public Internet 11, the content source server 12, the data source 13, and the like.

The billing processing and legal interception apparatus 200b may be located in an Evolved Packet Core (EPC) network. In addition, the accounting processing and legal interception apparatus 200b may be independently located outside the P-GW 200a and may communicate with the P-GW 200a. The billing processing and the legal interception apparatus 200b may monitor the network usage of the user and perform billing processing on the user. In a mobile network, since a pay-as-you-go policy is common in the charging policy of a data service, it may be important to charge according to network usage. In addition, legal interception may mean intercepting users' use of network packets for legitimately acceptable purposes. For example, we may legally intercept content used by a particular user for research purposes and for investigative purposes. The charging process and the legal interception process may be performed by providing an interface for charging and legal interception from the P-GW 200a when the packet passes through the P-GW 200a. However, in general, the caching apparatus 400 may be located at a lower layer than the P-GW 200a, and the content stored in the caching apparatus 400 may be serviced to a user without passing through the P-GW 200a. There has been a problem in that billing processing and legal interception are difficult for content serviced by a caching device. The present invention may allow the content provided by the caching device to pass through the P-GW 200a stage to perform billing processing and legal interception. This will be described later.

The policy management system 14 may be configured by a combination of a service-based quality assurance policy setting supply function and a flow-based charge management function. The policy management system 14 collects basic service information from various service systems, performs authorization verification of the corresponding service according to the policy decision of the network operator, and executes a QA policy and a charging policy for allocating network bandwidth. Can be delivered to. The policy management system 14 may provide the charging information to the network. The policy management system 14 may 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 may provide an anchoring function for terminal movement between the base station and the base station, between the 3GPP network and the E-UTRAN, and between the Long Term Evolution (LTE) and the 3GPP network.

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

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

Content delivery system 10 according to an embodiment of the present invention, the core node 100, P-GW (200a), billing processing and lawful interception apparatus (200b), filtering apparatus 300, caching apparatus 400 And the like.

Hereinafter, the components will be described in order.

The core node 100 may receive information related to cached content transmitted to the user terminal 500 from the caching apparatus 400. The core node 100 may recognize the content transmitted from the caching apparatus 400 to the user terminal 500 based on the information. For example, when "Cynam's Gangnam Style" is transmitted in FHD (Full High Definition) quality from the caching apparatus 400 to the first user terminal 500, the core node 100 caches the information. Received from the 400, it may be recognized that the "Chan Gangnam Style" is transmitted in FHD quality from the caching apparatus 400 to the first user terminal 500. The description of the above-described content is merely an example, and the core node 100 may receive information related to various cached content transmitted to the user terminal 500 from the caching apparatus 400.

The information related to the cached content transmitted to the user terminal received by the core node 100 may include at least one of information for identifying the content, user terminal information to which the content is transmitted, and information indicating that the content is provided by a caching apparatus. It may include one. 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, play time information, name of the content, address information of a content provider providing the content, and the like. . The user terminal information provided with the content may include 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 a user who has received the content through the user terminal information. The information indicating that the content is 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 that is already provided to the user 500 by the caching device 400. It may include. The information related to the content may be included in an option field of a Transmission Control Protocol (TCP) header and transmitted from the caching apparatus 400 to the core node 100. In addition, the information related to the content may be transferred from the caching apparatus 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 upward from the caching apparatus 400 and transferred to the core node 100. The above-described information is merely an example, and according to an embodiment of the present invention, the core node 100 destinations the user 500 for the content provided to the user 500 or a packet having the same size in the caching apparatus 400. It may include a variety of information to the downlink transmission.

The core node 100 may secure 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 secure, for example, a packet including the same content as the cached content transmitted to the user terminal (B) through an external data source 13. In addition, the same content as the cached content transmitted to the user terminal may be the content (A) that the core node 100 holds. 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 secure the same content as the cached content transmitted from the public Internet 13 to the user terminal. The aforementioned content acquisition path of the core node 100 is merely an example, and the core node 100 is identical to cached content transmitted to the user terminal through various paths (ie, various content providers (CPs)). Content (for example, Gangnam-style of Psy of FHD quality) can be secured.

The core node 100 may transmit a packet including the content downward so that the secured packet passes through the P-GW 200a. The downlink transmission may mean a transmission from the core node toward the user terminal. According to an embodiment of the present invention as described above, although the content transmitted from the caching apparatus to the user terminal is directly serviced at a lower layer of the network, the P-GW 200a is applied to the content transmitted to the user terminal. The interface for billing processing and legal interception can be provided to the billing processing and legal interception apparatus. Accordingly, the billing processing and legal interception apparatus 200b may perform billing processing and legal interception on the corresponding contents even though the content transmitted from the caching apparatus to the user terminal is directly serviced at a lower layer of the network.

According to another embodiment of the present invention, the above-described downlink transmission may be performed by avoiding peak time. Since the packet including the above-described content is a packet including the content already delivered to the user, the core node 100 does not immediately respond to the request of the caching apparatus 400, and downwards the packet containing the content by avoiding the peak time. You can also send. In this case, the core node 100 may periodically monitor the amount of traffic transmitted downward. In addition, 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 the content already delivered to the user, the core node 100 may perform downlink transmission of the packets including the content at regular intervals. According to another embodiment of the present invention, the above-described downlink transmission may be performed when data of a predetermined size is collected. For example, the caching apparatus 400 may receive information about content transmitted to a specific user, and transmit the content downlink when content related to the received information is 100MB (megabytes). The aforementioned number is only an example, and the core node 100 may collect data of a predetermined size in various units and transmit the data downward.

The core node 100 may mark a predetermined value in a predetermined field of the packet including the content. The marking of the packet including the content by the core node 100 may be performed in an option field of a Transmission Control Protocol (TCP) header of the secured packet. Through the marking, the core node 100 may allow the lower node to recognize that the content is content delivered from the caching apparatus 400 to the user 500. In addition, 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 content delivered from the caching device 400 to the user 500 at a lower node of the core node 100. The predetermined decision may be a protocol previously agreed between at least two or more components of the caching apparatus 400, the core node 100, the P-GW 200a, and the filter node 300. The above-described marking method is merely an example, and the core node 100 may mark the packet including the content in various ways.

According to another exemplary embodiment of the present disclosure, the core node 100 may receive content transmitted from the caching apparatus 400 to the user terminal 500. In addition, the content may be content in which a predetermined value is marked in a field predetermined by the caching apparatus 400. The marking may be a marking indicating that the content is content provided from the caching apparatus 400 to the user terminal 500. The predetermined decision may be a protocol previously agreed between at least two or more components of the caching apparatus 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 transmit the content downward so that the received content passes through the P-GW 200a. The content may be transmitted downward from the core node 100 to pass through the P-GW 200a, so that charging and legal interception processing may be performed on the content. In addition, the content is marked content, and at least one of the P-GW 200a and the filtering node 300 may drop the content to prevent the content from being repeatedly transmitted to the user terminal 500. Bandwidth usage of the backhaul link can be reduced.

According to each exemplary embodiment of the present invention, the core node 100 transmits the content transmitted from the caching apparatus 400 to the user terminal 500 in a downward manner so that the charging process and the legal interception process for the corresponding content are performed. This can be done without design changes to the treatment and legitimate interception processes.

The P-GW 200a may receive a packet including content transmitted from the core node 100. The packet including 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 a packet that includes uncached content. The above-described packet is merely an example, and the P-GW 200a may receive all kinds of packets destined for the service user 500.

The billing processing and legal interception apparatus 200b may perform a billing process and a legal interception on a packet including the received content. The charging process and the legal interception process may be performed by the P-GW 200a and provided with an interface for charging processing and legal interception processing, and performed in the charging processing and legal interception apparatus 200b. The charging process and the legitimate eavesdropping process may be performed based at least in part on a packet containing the received content and user information. The charging process may be a charging process according to the network usage of the user according to the pay-as-you-go policy of the data service. The charging process may be performed according to the charging policy of the internet service provider. The charging process may be performed based on the user information and the network usage information of the user. The legal interception process may be to examine the contents of a packet including the content according to a research purpose or an investigation request of an investigation institution as described above. The legitimate eavesdropping process may be performed by examining the payload of the packet containing the content via deep packet inspection (DPI). The above charging process is merely an example, and the charging process may be performed according to various policies of the Internet service provider (ISP). In addition, the foregoing legal interception process is merely an example, and the legal interception process may be performed in various ways according to various purposes.

The P-GW 200a may determine whether a packet including the received content is a packet marked with a predetermined value 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 the packet containing the received content. As described above, the predetermined field may be an option field of a TCP header of a packet including the content. In addition, various methods of inspecting network packets may be included in the present invention. In addition, as described above, the P-GW 200a may 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 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 may receive the cached content, receive the content from the core node 100, and may repeatedly receive the same content. Accordingly, in order to prevent duplicate reception of content of the user terminal 500 and to reduce bandwidth usage of the backhaul link, the P-GW 200a may perform an additional process on the marked packet. This will be described later.

The P-GW 200a may further process the packet including the received content when it is determined that a packet including the received content is a packet marked with a predetermined value in a predetermined field. The further processing may include processing to filter the received packet and send it down to drop the filtered packet at a lower node or drop the filtered packet. Filtering the received packet may include identifying a marked packet among the received packet. If the packet including the content is a marked packet, the content of the packet including the content is already transmitted from the caching apparatus 400 to the user terminal 500, so that the P-GW 200a performs the further processing. This prevents duplicate transmission of content and reduces bandwidth on the backhaul link. The filtered packet may be dropped in the P-GW 200a. In addition, the packet may be dropped by the filtering device 300 according to another embodiment of the present invention as will be described later. By dropping packets containing content marked at P-GW 200a, packets containing downlinked content may be filtered and dropped before reaching the user terminal.

If it is determined that a packet including the received content is not a packet marked with a predetermined value in a predetermined field, the P-GW 200a may transmit the packet including the received content downward toward the user terminal. have. If the packet including the received content is not a marked packet, the content is not a content that is duplicately transmitted to the user terminal 500, and thus the P-GW 200a may transmit the packet including the received content to the user terminal. It can be transmitted downward in the direction (500). If the P-GW 200a is not a marked packet, the content is not the content transmitted from the caching apparatus 400 to the user terminal 500, and thus, the user terminal may be normally transmitted to the user terminal 500. 500 can be transmitted in the down direction.

The billing processing and legal interception apparatus 200b may communicate with the P-GW 200a of the EPC network. In addition, the billing processing and legal interception can be performed on the interface connecting the P-GW 200a and the S-GW 15, and also the billing processing and legal interception apparatus 200b outside the P-GW 200a. ) May be performed by receiving information from the P-GW 200a. The above description is only 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 apparatus 400.

The filtering device 300 may receive a packet including 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 including 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 a packet including uncached content. The above-described packet is merely an example, and the filtering device 300 may receive all kinds of packets destined for the service user 500.

The filtering device 300 may determine whether a packet including the received content is a packet in which a predetermined value is marked 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 the packet containing the received content. As described above, the predetermined field may be an option field of a TCP header of a packet including the content. In addition, various methods of inspecting network packets may be included in the present invention. In addition, as described above, the filtering device 300 may 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 may receive the cached content, receive the content from the core node 100, and may repeatedly receive the same content. Therefore, in order to prevent duplicate reception of content of the user terminal 500 and to reduce bandwidth usage of the backhaul link, the filtering device 300 may drop the marked packet. 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.

If the packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field, the filtering device 300 may filter and drop the packet including the received content. Filtering the received packet may include identifying a marked packet among the received packet. If the packet including the content is a marked packet, since the content of the packet including the content is already transmitted from the caching apparatus 400 to the user terminal 500, the filtering apparatus 300 includes the content. By dropping packets, it is possible to prevent redundant transmission of content and to reduce bandwidth of the backhaul link. By dropping the packet including the content marked by the filtering device 300, the packet including the content transmitted downward may be filtered and dropped before reaching the user terminal.

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

If it is determined that the packet including the received content is not a packet marked with a predetermined value in a predetermined field, the filtering device 300 may transmit the packet including the received content downward toward the user terminal. . If the packet including the received content is not a marked packet, the content is not a content that is duplicately transmitted to the user terminal 500, and thus, the filtering device 300 transmits the packet including the received content to the user terminal ( 500 can be transmitted in the down direction. If the filtering device 300 is not a marked packet, the content is not the content transmitted from the caching device 400 to the user terminal 500, and thus the user terminal 500 may be normally transmitted to the user terminal 500. Can be transmitted in the downward direction.

The filtering device 300 may be located at an upper layer of the S-GW 15 to reduce bandwidth of the backhaul link. According to another embodiment of the present invention, by dropping the packet marked through the filtering device 300, by adding only the filtering device in the conventional content delivery system, the billing process according to another embodiment of the present invention simply And a legitimate eavesdropping process.

The caching apparatus 400 may cache at least a portion of the predetermined content. The caching apparatus 400 may cache the content according to a predetermined caching policy. The caching apparatus 400 may cache, for example, multi-request content or a large amount of content according to a predetermined criterion to reduce bandwidth of the backhaul link. The caching apparatus 400 according to an embodiment of the present invention may cache some of the content in chunks or cache all of the content. The caching apparatus 400 may obtain and cache an original content of the content from the public Internet 11, the data source 13, and the content source server 12. The above-described content securing path is merely an example, and the caching apparatus 400 may secure the content through various paths (eg, secure content from the core node 100) and cache the content.

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

The caching apparatus 400 may determine whether the content related to the content transfer request message is the cached content. The caching apparatus 400 may determine whether the requested content is cached based on the 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, play time information, name of the content, address information of a content provider providing the content, and the like. . The caching apparatus 400 may determine whether to cache the corresponding content by comparing the content identification information included in the content request with the identification information of the cached content.

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

The caching apparatus 400 transmits the core node 100 to the user terminal in order to allow the core node 100 to transmit a packet including the same content as the content transmitted to the user terminal in accordance with an embodiment of the present invention. Information associated with the cached content may be transmitted to the core node 100. Since the caching apparatus 400 is located at a lower layer than the P-GW 200a, the content directly transmitted from the caching apparatus 400 to the user terminal 500 has a problem in that billing processing and legal interception are difficult. The caching apparatus 400 may allow the core node 100 to downwardly transmit a packet including the same content as the content transmitted to the user terminal. Therefore, even though the caching apparatus 400 is located at a lower layer than the P-GW 200a, the caching apparatus 400 may perform billing processing and legal interception on the content 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 through which the content is transmitted, and information indicating that the content is provided by a cache node. . The information related to 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 the information related to the cached content transmitted to the user terminal to the core node 100 avoiding the peak time. Since the content is already transmitted to the user, the caching apparatus 400 does not have to cause the core node 100 to immediately transmit the content downward, so that the information related to the content to the core node 100 avoiding the peak time. Can also be transmitted. In addition, according to another embodiment of the present invention, the caching apparatus 400 may transmit information related to the cached content transmitted to the user terminal to the core node 100 at a predetermined cycle. Further, according to another exemplary embodiment of the present disclosure, the caching apparatus 400 may transmit information regarding the cached content transmitted to the user terminal when the cached content transmitted to the user terminal has a predetermined size. 100). For example, when a specific user receives Psy's Gangnam Style (31MB) and Girls 'Generation Girls' Generation (69MB) music video from a caching device, the caching device (if the specific user receives 100MB of content) 400 may transmit information related to the cached Psy's Gangnam style and Girls 'Generation Girls' Music video to the core node 100. The above-described content and the size of the contents are only examples, and the caching apparatus 400 integrates the contents transmission contents of the caching apparatus 400 in various size units and provides information related to the cached contents transmitted to the user terminal in the core node 100. ) Can be sent.

The caching apparatus 400 according to an embodiment of the present invention may be located at an edge node (EN). In addition, the caching apparatus 400 may be located in the base station eNB. The above-described location is merely an example, and the caching apparatus 400 may be located in a layer close to the user terminal 500 in order to greatly reduce content transmission.

According to another embodiment of the present invention, the caching apparatus 400 transmits 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 downlink. Cached content may be transmitted to the core node 100. In addition, according to another embodiment of the present invention, the caching apparatus 400 may mark a predetermined value in the predetermined field of the content and transmit it to the core node 100. The caching apparatus 400 may reduce the bandwidth usage by preventing the content from being repeatedly transmitted to the user terminal 500 by marking the content and transmitting the same to the core node 100. The predetermined field may be an option field of a TCP header. The predetermined decision may be a protocol previously agreed between at least two or more components of the caching apparatus 400, the core node 100, the P-GW 200a, and the filter node 300.

According to another exemplary embodiment of the present disclosure, the caching apparatus 400 may branch the content transmitted to the user terminal 500 and transmit the branched content to the core node 100. The caching apparatus 400 may branch the content transmitted to the user terminal so that the core node 100 may perform the instant charging processing and the legal interception on the corresponding content.

In addition, the caching apparatus 400 may transmit the content transmitted to the user terminal 500 to the core node 100 according to a preset period. The preset period may be a unit of seconds, minutes, hours, etc. The above-described time unit is an example, and various times may be a content transmission period for the core node 100. In addition, the caching apparatus 400 may transmit the content transmitted to the user terminal 500 to the core node 100 based on whether the preset content delivery threshold is reached. The caching apparatus 400 may count the amount of content delivered to the user terminal 500, and transmit the content to the core node 100 when the amount of content reaches a preset content rate threshold. The caching apparatus 400 transmits the content transmitted to the user terminal 500 to the core node 100 based on whether a preset period or a preset content transfer threshold is reached, thereby transmitting resource usage of the caching apparatus 400. Can be saved.

In addition, the caching apparatus 400 may transmit the content transmitted to the user terminal 500 to the core node 100 avoiding the peak time. By caching the content 400 to the core node 100 avoiding the peak time, the caching apparatus 400 may reduce network congestion due to bandwidth usage for billing processing and legal interception processing. In this case, the caching apparatus 400 may periodically monitor the amount of traffic communicating with the core node 100.

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

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

The receiving module 110 includes the public Internet 11, the content source server 12, the data source 13, the P-GW 200a, the caching apparatus 400, the user terminal 500, and other wired / wireless communication systems. It may include one or more modules that enable wired / wireless communication with the network. The receiving module 110 may include a wired / wireless internet module for network connection. Wireless Internet technologies may include Wireless LAN (Wi-Fi), Wireless Broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), and the like. Wired Internet technologies may include Digital Subscriber Line (XDSL), Fibers to the home (FTTH), Power Line Communication (PLC), and the like. The receiving module 110 may receive information related to cached content transmitted to the user terminal from the caching apparatus 400 according to an exemplary embodiment of the present invention. Information related to cached content is as described above. In addition, according to another embodiment of the present invention, the receiving module 110 may receive the marked content transmitted to the user terminal from the caching apparatus 400.

The packet securing 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 may secure the content original based on the information related to the cached content. The content securing method performed in 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 including the content. This is as described above. In addition, according to another embodiment of the present invention, the operation of marking the predetermined value in the predetermined field of the packet including the content may be performed by the control module 170. This is as described above. In addition, the packet acquisition module 130 may include a wired / wireless internet module for network access to secure the original content.

The transmission module 150 may transmit information to a lower layer of the core node 100. The transmission module 150 may transmit the packet including the content downward so that the packet including the content passes through the P-GW 200a according to an embodiment of the present invention. According to an embodiment of the present invention, the packet including 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. In addition, as described above, the control module 170 may mark a predetermined value in a predetermined field of a packet including the secured content. The control module 170 may execute a software code or a programming language.

Various embodiments described herein may be implemented 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 include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and the like. It may be implemented using at least one of a processor, controllers, micro-controllers, microprocessors, and electrical units for performing other functions. The described embodiments may be implemented by the control module 170 itself.

4 is 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 charging processing interface 230, a legal interception interface 250, a control module 270, and a transmitting module 290.

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

The billing processing interface 230 is an interface for billing processing and the legal interception apparatus 200b for billing processing so that the billing process and the legal interception apparatus 200b may 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 charging process is as described above.

The legal interception module 250 performs the legal interception processing on the billing processing and the legal interception apparatus 200b so that the billing processing and the legal interception apparatus 200b can perform the legal interception process for the packet including the received content. It can provide an interface. Legal interception may refer to a process of legally intercepting packet contents in response to research purposes such as content usage analysis and a request for investigation cooperation from an investigation agency. Legal interception is as described above.

The control module 270 may determine whether a packet including the received content is a packet marked with a predetermined value in a predetermined field. The specific determination method is as described above. In addition, the predetermined decision may be a previously agreed protocol between at least two components among the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400. In addition, the control module 270 may control the overall operation of the P-GW 200a. As described above, when the packet including the received content is a packet marked with a predetermined value in a predetermined field, the control module 270 transmits the content to the user terminal 500 from the caching apparatus 400. It can be recognized. The control module 270 may determine whether to perform the additional process or transmit the downlink according to whether the packet including the received content is marked. The further process is as described above. The control module 270 may reduce the bandwidth usage of the backhaul link by determining to drop the marked packet to prevent duplicate transmission of content.

In a further aspect of the present invention, the filtering module 270 in the P-GW 200a may be omitted if the filtering and drop process is implemented by a lower node (eg, filtering device).

The transmission module 290 may include a wired / wireless internet module for network connection. If the packet including the received content is not a packet marked with a predetermined value in a predetermined field, the transmitting module 290 may transmit the received packet downward toward the user terminal. Alternatively, the transmission module 290 may automatically deliver the received packet to the lower node when the charging process for the received packet is completed without determining whether the received packet is marked. In addition, when the packet including the received content is not a marked packet, the transmission module 290 is not a packet that is redundantly transmitted to the user terminal 500. Therefore, the transmission module 290 uses the packet without performing an additional process. It may be transmitted downward toward the terminal 500.

5 is a block diagram of a filtering device 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 content transmitted from the core node 100 according to an embodiment of the present invention. The packet including the content may be a packet including the same content as the cached content transmitted to the user terminal. In addition, the reception module 310 may receive all kinds of packets transmitted downward from the P-GW 200a.

The control module 330 may determine whether a packet including the received content is a packet marked with a predetermined value in a predetermined field. The specific determination method is as described above. In addition, the predetermined decision may be a previously agreed protocol between at least two components among the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400. In addition, the control module 330 may control the overall operation of the filtering device 300. As described above, when the packet including the received content is a packet marked with a predetermined value in a predetermined field, the control module 330 transmits the content to the user terminal 500 from the caching apparatus 400. It can be recognized. The control module 330 may determine whether to transmit the packet according to whether the packet including the received content is marked. If it is determined that the packet including the received content is a packet marked with a predetermined value in a predetermined field, the control module 330 may determine to filter and drop the packet including the received content. have. The control module 330 may reduce the bandwidth usage of the backhaul link by determining to drop the marked packet to prevent duplicate transmission of content.

The transmission module 350 may include a wired / wireless internet module for network connection. If it is determined that a packet including the received content is not a packet marked with a predetermined value in a predetermined field, the transmission module 350 may transmit the received packet downward toward the user terminal. As described above, when the packet including the received content is not a marked packet, the transmission module 350 is not a packet that is redundantly transmitted to the user terminal 500, and thus the packet is not performed without performing an additional process. May be transmitted downward in the direction of the user terminal 500.

The filtering device 300 is an optional configuration. When the filtering and drop process for a packet is implemented by an upper node (eg, the P-GW 200a), the filtering device 300 may be omitted.

6 illustrates a block diagram of a caching apparatus according to an embodiment of the present invention.

The caching apparatus 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 multi-requested content 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 content in case of a cache miss. The specific content securing method is 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 apparatus 400. The control module 430 may determine whether the content related to the content request message from the user terminal is the cached content. The method of determining whether the content requested from the user terminal is cached content is as described above.

In addition, the control module 430 may be configured to filter and drop cached content transmitted to the core node 100 before reaching the user terminal 500 from the core node 100 according to another embodiment of the present invention. In order to do so, a predetermined value may be marked in a predetermined field of the content. In this regard, it is 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 transmitting module 450 transmits the cached content to the user terminal, and causes the core node 100 to transmit the cached content to the user terminal. Information related to cached content transmitted to the user terminal may be transmitted to the core node 100 to allow transmission of a packet including content identical to content. The information related to the cached content is as described above.

In addition, the transmission module 450 according to another embodiment of the present invention, 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 down, The cached content transmitted to the user terminal 500 may be transmitted to the core node 100. In this regard, it is as described above.

In addition, when 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 higher node to secure the content.

7 is a flowchart illustrating 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 necessary.

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

The caching apparatus 400 may determine whether the requested content is cached content (602). This is as described above.

If the requested content is cached content (cache hit), the caching apparatus 400 may transmit the cached content to the user terminal 500 (603). In addition, although not shown in the drawing, the caching apparatus 400 may transmit a request for the content to a higher node when the requested content is not cached content (cache miss).

The caching apparatus 400 transmits the core node 100 to the user terminal in order to allow the core node 100 to transmit a packet including the same content as the content transmitted to the user terminal in accordance with an embodiment of the present invention. Information associated with the cached content may be transmitted to the core node (604). 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 to which the content is transmitted, and information indicating that the content is provided to a 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 content transmitted to the user terminal to the core node 100 avoiding peak time. In addition, as described above, according to another embodiment of the present invention, the caching apparatus 400 may transmit information related to cached content transmitted to the user terminal to the core node 100 at predetermined intervals. In addition, the caching apparatus 400 may transmit the information related to the cached content transmitted to the user terminal 500 to the core node 100 when the amount of information satisfies a predetermined threshold.

The core node 100 may secure a packet including the same content as the cached content transmitted to the user terminal based on the received information (605). The method of securing a packet including the same content as the cached content transmitted to the user terminal is as described above.

Core node 100 may mark a predetermined value in a predetermined field of the packet containing the content (606). The predetermined field may be an option field of a TCP header. In addition, as described above, the core node 100 may mark the packet including the content in various ways. In addition, the predetermined decision may be a previously agreed protocol between at least two components among the core node 100, the P-GW 200a, the filtering device 300, and the caching device 400.

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

The P-GW 200a may provide an interface for billing and legal interception for packets containing the received content. This is as described above.

The P-GW 200a may determine whether a packet including the received content is a packet marked with a predetermined value in a predetermined field (609). This is as described above.

If the P-GW 200a determines that the packet is marked, the P-GW 200a may filter the received packet and drop the filtered packet (610). This is as described above. By dropping the packet from the P-GW 200a, the packet including the downlinked content may be filtered and dropped before reaching the user terminal. Therefore, the P-GW 200a may reduce bandwidth usage of the backhaul link.

If the P-GW 200a is not a marked packet, the P-GW 200a may transmit downlink (611). If the packet is not marked, the packet is not a duplicated packet but is a packet that is normally transmitted. Thus, the billing processing and legal interception apparatus 200a transmits the packet to the user terminal 500.

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

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

The caching apparatus 400 presets a predetermined field to be filtered and dropped before the content reaches the user terminal 500 from the core node 100 in the content transmitted to the core node according to an 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 apparatus 400 may mark a predetermined value in the predetermined field of the content.

The caching apparatus 400 cores the marked content in order to allow the core node 100 to downwardly transmit a packet including the same content as the content transmitted to the user terminal according to an embodiment of the present invention. The node 100 may transmit to the node 100 (705).

9 is a flowchart illustrating 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 necessary.

Steps 801 to 809 described in FIG. 9 are the same as steps 601 to 609 described in FIG. In addition, step 812 described in FIG. 9 is the same as step 611 described in FIG.

If it is determined that the received packet is a marked packet, the P-GW 200a may filter the received packet and transmit it downward so that the filtered packet can be dropped from the lower node (810). The lower node may include a filtering device 300.

If the received packet is a marked packet, the filtering device 300 may filter and drop a packet including content, in operation 811. This is as described above. By filtering and dropping the packet in the filtering device 300, the packet including the downlinked content may be filtered and dropped before reaching the user terminal. Therefore, the filtering device 300 may reduce the bandwidth usage of the backhaul link.

10 is a flowchart illustrating 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 necessary.

Steps 901 to 908 described in FIG. 10 are the same as steps 701 to 708 described in FIG. In addition, since step 811 described with reference to FIG. 8 is the same as step 610 described with reference to FIG.

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

If the received packet is a marked packet, the filtering device 300 may filter and drop a packet including content (910). This is as described above. By filtering and dropping the packet in the filtering device 300, the packet including the downlinked content may be filtered and dropped before reaching the user terminal. Therefore, the filtering device 300 may reduce the bandwidth usage of the backhaul link.

One 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, instructions, information, signals, bits, symbols, and chips that may be referenced in the above description may include voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields. Or particles, or any combination thereof.

One of ordinary skill in the art would appreciate that the various exemplary logical blocks, modules, processors, means, circuits and algorithm steps described in connection with the embodiments disclosed herein may be implemented in electronic hardware, It will be appreciated that for purposes of the present invention, various forms of program or design code, or combinations thereof, may be implemented. 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 particular application and design constraints imposed on 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 embodied in 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, computer-readable media may include magnetic storage devices (eg, hard disks, floppy disks, magnetic strips, etc.), optical discs (eg, CDs, DVDs, etc.), smart cards, and flash memory. Devices, such as, but not limited to, EEPROM, cards, sticks, key drives, and the like. In addition, various storage media presented herein 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 delivering instruction (s) and / or data.

It is to be understood that the specific order or hierarchy of steps in the processes presented is an example of exemplary approaches. Based upon design priorities, it is understood that the specific order or hierarchy of steps in the processes may be rearranged within the scope of the present invention. The accompanying method claims present 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 presented 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 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 should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

As described above, related 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)

As a content delivery method performed by a core node (CN), Receiving information related to cached content transmitted to a user terminal from a caching apparatus; Obtaining a packet including the same content as the cached content transmitted to the user terminal based on the received information; And Transmitting a packet including the content downward so that the secured packet passes through a PDN gateway (P-GW); Including, How to transfer content. The method of claim 1, Marking a predetermined value in a predetermined field of a packet containing the content; More, The predetermined field is An option field of a Transmission Control Protocol (TCP) header of the secured packet; How to transfer content. The method of claim 1, The packet including the downlink content, Filtered and dropped before reaching the user terminal, How to transfer content. The method of claim 1, The caching apparatus is located at an edge node (EN), How to transfer content. As a content delivery method performed by a P-GW, Receiving a packet containing content transmitted from a core node; Providing an interface for billing processes and legitimate eavesdropping on packets containing the received content; Determining whether a packet including the received content is a packet marked with a predetermined value in a predetermined field; If it is determined that a packet including the received content is a packet marked with a predetermined value in a predetermined field, further processing the packet including the received content; And If it is determined that the packet including the received content is not a packet marked with a predetermined value in a predetermined field, transmitting the packet including the received content downward toward the user terminal; Including, How to transfer content. The method of claim 5, wherein Further processing the packet containing the received content; Filtering the received packet; And Dropping the filtered packet; Including, How to transfer content. As a content transmission method performed by a filtering device, Receiving a packet containing 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; Filtering and dropping a packet including the received content if the packet including the received content is determined to be a packet marked with a predetermined value in a predetermined field; And If it is determined that the packet including the received content is not a packet marked with a predetermined value in a predetermined field, transmitting the packet including the received content downward toward the user terminal; Including, How to transfer content. As a content delivery method performed by a caching apparatus, Caching at least a portion of the predetermined content; Receiving a content transmission request message from a user terminal; Determining whether content associated with the content transfer request message is the cached content; If the content related to the content transmission request message is determined to be cached content, transmitting the cached content to the user terminal; And Transmitting information related to the cached content transmitted to the user terminal to the core node to allow the core node to transmit a packet including content identical to the content transmitted to the user terminal downlink; Including, How to transfer content. The method of claim 8, The information related to the cached content transmitted to the user terminal, And 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 by a cache node. How to transfer content. As a core node, A receiving module for receiving information related to the cached content transmitted to the user terminal from the caching apparatus; A packet obtaining module, based on the received information, generating a packet including content identical to cached content transmitted to the user terminal; And A transmission module for downwardly transmitting a packet including the content such that the packet including the content passes through a P-GW; Including, Core node. As P-GW, A receiving module for receiving a packet including content transmitted from a core node; A billing processing interface providing an interface for billing processing for a packet including the received content; A legal interception interface for providing an interface for legal interception for a packet including the received content; A control module for determining whether a packet including the received content is a predetermined packet in a predetermined field, and if the received packet is determined to be a marked packet, further processing the received packet; And A transmission module for transmitting the received packet downward toward a user terminal when a packet including the received content is not a packet marked with a predetermined value in a predetermined field; Including, P-GW. As filtering device A receiving module for receiving a packet including content transmitted from the P-GW; When it is determined whether a packet including the received content is a packet marked with a predetermined value in a predetermined field, and when the packet including the received content is determined as a packet marked with a predetermined value in a predetermined field, A control module for determining to filter and drop a packet including the received content; And A transmission module for downwardly transmitting a packet including the received content toward a user terminal when it is determined that a predetermined value is not a marked packet in a predetermined field in the predetermined field; Including, 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 content associated with a content transfer request message from a user terminal is the cached content; And If the content related to the content transfer request message is determined as the cached content, the cached content is transmitted to the user terminal, and a core node sends a packet including the same content as the content transmitted to the user terminal. A sending module for transmitting information related to the cached content transmitted to the user terminal to allow the downlink transmission to the core node; Including, Caching device. As a content delivery system, A caching apparatus for transmitting the cached corresponding content to the user terminal in response to a request for transmission of 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 which secures a packet including the same content as the content based on the information related to the content, and transmits a packet including the secured content downward to a P-GW; Including, Content delivery system. The method of claim 14, Providing an interface for billing processing and legal interception for a packet including the downlinked content, determining whether the packet including the content is a marked packet, and dropping the marked packet if the packet is marked P-GW; Further comprising, Content delivery system. The method of claim 14, A P-GW providing an interface for billing processing and legal interception for a packet including the downlinked content and transmitting a packet including the content 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; Further comprising, Content delivery system. As a content delivery method performed by a caching apparatus, Caching at least a portion of the predetermined content; Receiving a content transmission request message from a user terminal; Determining whether content associated with the content transfer request message is the cached content; If the content related to the content transmission request message is determined to be cached content, transmitting the cached content to the user terminal; And Sending cached content sent to the user terminal to the core node to allow a core node to send down content identical to the content sent to the user terminal; Including, How to transfer content. The method of claim 17, Marking the cached content sent to the core node to be filtered and dropped before reaching the user terminal from the core node; Further comprising, How to transfer content. The method of claim 18, The marking is a marking performed on an option field of a TCP header, How to transfer content. The method of claim 17, The step of transmitting to the core node, Branching the content transmitted to the user terminal to the core node, transmitting the content based on a preset period, transmitting the peak time avoiding the content, and whether a preset content transmission threshold is reached. At least one of the steps of transmitting based on: How to transfer content. As a content delivery method performed by a core node, Receiving the marked content transmitted from the caching device to the user terminal; And Downwardly transmitting the content such that the received content passes through a P-GW; Including, 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 content associated with a content transfer request message from a user terminal is the cached content; And If the content related to the content transfer request message is determined as the cached content, the cached content is transmitted to the user terminal, and a core node sends a packet including the same content as the content transmitted to the user terminal. A transmission module for transmitting the cached content transmitted to the user terminal to the core node to allow downlink transmission; Including, Caching device. According to claim 22, A control module for marking the content so that the cached content sent to the core node is filtered and dropped before reaching the user terminal from a core node; Including, 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 transmitting the content downward so that the received content passes through a P-GW; Including, Core node. As a content delivery system, A caching apparatus for transmitting the cached corresponding content to the user terminal in response to a request for transmission of the content from the user terminal, and for transmitting the content transmitted to the user terminal to a core node; And A core node receiving the content and transmitting the content downward so that the received content passes through a P-GW; Including, Content delivery system. The method of claim 25, A caching apparatus for marking the content so that the cached content transmitted from the caching apparatus to the core node is filtered and dropped before reaching the user terminal from the core node; Including, Content delivery system. The method of claim 26, A P-GW providing an interface for billing processing and legally intercepting the downlinked content, determining whether the content is marked content, and dropping the marked packet if the content is marked content; Further comprising, Content delivery system. The method of claim 26, A P-GW providing an interface for billing processing and legal interception for the downlinked content and transmitting the content to a filter node; And A filter node that determines whether the content received from the P-GW is marked content, and drops the marked packet if the content is marked content; Further comprising, Content delivery system. 22. A computer readable medium comprising computer program code for performing the method of any one of claims 1-9 and 17-21.

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