KR101319832B1 - Mobile contents delivery service method and local cashing server - Google Patents

Abstract

The present invention relates to a mobile content providing method and a local caching apparatus for the mobile content providing method that can deliver content seamlessly even when handover of the mobile node through the interworking of the Internet network and the mobile network, the local caching apparatus connected to the Internet network and mobile network Receives a content request of a mobile node connected to the mobile network through an internet network, extracts mobile path information assigned to the mobile node from the mobile network, and then, based on the mobile path information, obtains data of the requested content. The mobile node is provided to the mobile node through the mobile network, and when a handover of the mobile node is detected while providing content, the remaining data of the content is transmitted to the mobile node through the internet network.

Description

Mobile content delivery method and local caching apparatus for the same {Mobile contents delivery service method and local cashing server}

The present invention relates to a mobile content providing method for providing content to a mobile node connected to a mobile network and a local caching apparatus for the same. The present invention relates to a mobile content providing method capable of delivering content without the need and a local caching apparatus therefor.

Contents delivery network (CDN) service is a service for stably delivering various contents including a video such as a movie, a music video, etc. to a user, and pre-stores the contents in a plurality of cache servers distributed in a network. A load balancer such as a Global Load Balance (GLB) server selects an optimal cache server from a plurality of cache servers, and delivers the requested content to the user's terminal through the selected cache server.

The CDN has been implemented to solve data instability, bottlenecks, transmission speed degradation, and instability such as data dropping on the Internet.

On the other hand, as mobile terminals become high-performance and high-functionality, such as smart phones, and communication costs are low, the use of contents through the mobile terminals is rapidly increasing, and an attempt has been made to integrate a CDN server in a mobile network.

However, the mobile network is designed in consideration of the mobility of the user, and since frequent handovers occur according to the movement of the user, a method for providing content without interruption even during handover is required.

The present invention has been proposed to solve the conventional needs, and to provide a mobile content providing method and local caching apparatus therefor that can deliver content seamlessly even when handover of a mobile node through interworking the Internet network and the mobile network. do.

In addition, the present invention is to provide a mobile content providing method and a local caching apparatus for applying a conventional CDN scheme based on a wired network to a mobile network without major changes.

As a means for solving the above problems, the present invention, a storage unit for storing a part or all of each of one or more contents serviced by one or more content providers; A first interface unit connected to an internet network and transmitting and receiving data through the internet network; A second interface unit connected to a mobile network and transmitting and receiving data through the mobile network; And a controller configured to transmit data of the requested content to the mobile node through the mobile network when a content request message of a mobile node for content stored in the storage unit is received from the internet network through the first interface unit. It provides a local caching apparatus for providing content.

In the local caching apparatus, while providing the content to the mobile node, when the handover of the mobile node is detected, the controller transmits the remaining data of the content to the mobile node through the internet network.

In the local caching apparatus, the controller checks mobile path information necessary for delivering data to a mobile node through the mobile network, and emulates data of the content into a mobile packet using the mobile path information.

In the local caching apparatus, the second interface unit may further perform mirroring on a mobile packet transmitted through the mobile network, and the controller may further include a response message for the received content request message. The mobile packet corresponding to the transmitted response message may be extracted from the mobile packet mirrored from the second interface, and the mobile path information may be checked from the extracted mobile packet.

In the local caching apparatus, the controller extracts source address information included in the received content request message, and uses the extracted source address information as address information of a mobile node used in an internet network. A mapping table mapped with information is generated and stored in the storage unit, and the content is provided with reference to the mapping table.

In addition, the present invention is another means for solving the above problems, the local caching apparatus connected to the Internet network and the mobile network receiving the content request of the mobile node connected to the mobile network via the Internet network; Extracting, by the local caching device, mobile path information assigned to the mobile node in the mobile network; And providing, by the local caching apparatus, the data of the requested content to the mobile node through the mobile network based on the mobile path information.

The mobile content providing method may include: checking, by the local caching apparatus, whether the mobile node is handed over; And when the handover of the mobile node occurs, the local caching apparatus may further transmit the remaining data of the content to the mobile node through the internet network.

In the mobile content providing method, receiving a content request from the mobile node may include receiving address information of the local caching device from the mobile node that has obtained address information of the local caching device in response to a domain name query. And receiving a content request message as a destination, wherein the address information of the local caching device is provided to the mobile node from the local caching device that extracts the domain name query of the mobile node by monitoring traffic of the mobile network. Can be.

Here, the mobile path information includes one or more of an IP (Internet Protocol) address and a port address of the mobile node allocated on the mobile network and tunneling identification information.

In the mobile content providing method, the extracting of the mobile path information may include: transmitting a response message to the received content request to the mobile node through the Internet network; Monitoring the traffic of the mobile network and extracting the response message transmitted from the internet network to the mobile network and delivered to the mobile node through the mobile network; And extracting mobile path information assigned to the mobile node from the extracted response message, in addition, a source including at least one of a source IP address and a source port address from the received content request message. Extracting address information; And mapping and storing the source address information of the extracted content request message and the extracted mobile path information.

In this case, the extracting of the response message transmitted through the mobile network may include extracting a packet corresponding to an address of the local caching apparatus by checking source address information of a mobile packet transmitted from the mobile network. have.

In addition, the mobile content providing method, in the step of transmitting a response message for the received content request to the mobile node via the Internet network, the local caching server includes the message identification information in the response message, In the extracting of the response message transmitted through the mobile network, the mobile packet including the message identification information may be extracted as the response message.

In the mobile content providing method, providing the data of the requested content to the mobile node through the mobile network may include transmitting the packet of the content to the mobile node using the mobile path information. Emulating a mobile packet to be sent to.

According to the present invention, in a mobile network including a plurality of geographically separated wireless access networks and a core network connecting them, the local caching apparatus is distributed to a mobile node connected to a specific wireless access network based on the wireless access network. In order to provide content through a local caching apparatus disposed in the wireless access network, the local caching apparatus is simultaneously connected to not only a mobile network but also an internet network, and the mobile network is provided while providing content to the mobile node through a mobile network. When the handover of the node is detected, the remaining portion of the corresponding content is continuously provided to the mobile node through the Internet network, thereby having an excellent effect of delivering the content seamlessly even when handing over to the mobile node.

In addition, the present invention generally returns the address of the cache server that will provide the content to the user terminal when the DNS query for the content request from the user terminal, thereby allowing the user terminal to access the corresponding cache server to request and receive the content. By applying the CDN service procedure of to the content provision through the mobile network without major modification, the implementation cost can be reduced while the implementation is simple.

1 is a diagram showing an overall network structure in which mobile content is provided according to the present invention.
2 is a block diagram illustrating a configuration of a local caching apparatus according to an exemplary embodiment.
3 is a flowchart illustrating a mobile content providing method of a local caching apparatus according to an exemplary embodiment.
4 is a diagram illustrating a content request path from a mobile node and a content providing path of a local caching apparatus in the mobile content providing method of the present invention.
5 is a diagram illustrating a content transmission path during handover of a mobile node in the mobile content providing method of the present invention.
FIG. 6 is a diagram for explaining a packet transmitted between a local caching apparatus and a mobile node through an internet network and a mobile network.
FIG. 7 is a flowchart illustrating a process of extracting mobile path information for providing content through a mobile network in a mobile content providing method of the present invention.
8 is an exemplary diagram of a mapping table used for providing content through a mobile network in the method for providing mobile content according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

In addition, among the terms used in the following description, 'address information' refers to information allocated for each endpoint (for example, a mobile node, a local cache device, etc.) that transmits and receives a packet through a communication network. May contain a port address. In addition, based on each packet transmitted through a communication network (including an internet network and a mobile network), the address information of the endpoint transmitting the packet is 'origin address information', and the address information of the endpoint receiving the packet. Denotes 'destination address information'. In addition, 'mobile packet' refers to a packet transmitted through a tunneling technique (for example, a GTP tunnel) in a mobile network, distinguished from an IP packet transmitted through an internet network. In addition, 'mobile pass information' is information necessary for delivering a packet in a mobile network, and means header information necessary for constructing the mobile packet, and tunneling for a tunnel generated for each mobile node as well as source address information and destination address information. It further includes identification information (TEID: Tunnel Endpoint ID).

1 is a diagram illustrating a network structure for providing mobile content according to the present invention.

In FIG. 1, reference numeral 100 denotes a mobile network to which mobile content provision according to the present invention is applied. The mobile network 100 is a communication network implemented so that a user can use a communication service while moving, and is not only a mobile communication network such as LTE (Long term evolution) network and WCDMA network, but also a variety of other Wi-Fi networks. Kinds of wireless networks and combinations thereof.

The mobile network 100 may connect a plurality of wireless access networks 120 and 130 and the plurality of wireless access networks 120 and 130 or may be connected to the plurality of wireless access networks 120 and 130 and an external network. It may include a core network 110 connecting the Internet network 200.

The wireless access networks 120 and 130 are access networks for performing wireless communication with a mobile node 600 representing a terminal device that can be connected to a mobile network, such as a mobile phone or a smartphone. For example, a BS (Base Station) and a BTS ( A plurality of base stations such as a base transceiver station (NodeB), a NodeB, an eNodeB, and the like, and a base station controller such as a base station controller (BSC) and a radio network controller (RNC) may be implemented.

In another method, the digital signal processor and the wireless signal processor integrated in the base station are referred to as digital units 121 and 131 and radio units RU, respectively. (122) and (132), a plurality of RUs (122, 132) are installed in a plurality of areas, respectively, and a plurality of RUs (122, 132) may be connected to the centralized DU (121,131).

In addition, the core network 110 is a network system that performs main functions for mobile communication services such as call processing, mobility control and switching between the wireless access networks 120 and 130, and may be implemented with various functional elements. FIG. 1 illustrates only an Evolved Packet Core (EPC) 111 and a switching device 112 required for describing a mobile content providing method according to the present invention.

The packet core device 111 manages and controls packet flow in the mobile network 110, and performs interworking with the mobile network 11 and an external network, that is, the internet network 200.

The mobile network 100 may include various functions in addition to the above-described configuration. However, since the mobile network 100 is not directly related to the mobile content providing process according to the present invention, the description and illustration thereof will be omitted.

The Internet network 200 is a general public communication network in which information is exchanged according to the TCP / IP protocol, and may be established through one or more of wired, wireless, and optical communication technologies, and may include instant message services, Internet portal services, and social network services. Various services such as e-commerce services are provided based on the Internet network 200.

Particularly, in the present invention, the Internet network 200 has a plurality of contents and loads the content providing apparatus 300 of the content provider (CP) for providing the contents to the user and the content delivery process. A GLB (400 Global Load Balance) device 400 for distributing the data is connected. The GLB device 400 receives a specific content request provided by the content providing device 300 from a user terminal including a mobile node 600. When a DNS query is received, a device for providing content requested by a user among local caching apparatuses 500a and 500b for providing mobile content, as well as a plurality of local cache servers (not shown) storing corresponding contents. It provides the IP address of the user terminal. Accordingly, the user terminal requests and receives contents from the obtained IP address.

In particular, in the present invention, the GLB device 400 is a DNS query for the content providing device 300 from the mobile node 600 connected to the mobile network 100, a plurality of connected to the mobile network 100 Select one of the local caching apparatuses 500a and 500b according to a preset criterion (for example, the location of the mobile node 600), and select the IP address of the selected local caching apparatuses 500a and 500b. 600). Here, the IP address provided to the mobile node 600 is a public IP address allocated on the Internet network 200 to the local caching apparatuses 500a and 500b.

Accordingly, the mobile node 600 transmits a content request message to the local caching apparatuses 500a and 500b using the IP address obtained in response to the DNS query.

The local caching apparatuses 500a and 500b are main components for performing mobile content provision according to the present invention and are simultaneously connected to the mobile network 100 and the internet network 200. In this case, the local caching apparatuses 500a and 500b may be provided in units of wireless access networks 120 and 130 of the mobile network 100. More specifically, the local caching apparatuses 500a and 500b are connected to each of the wireless access networks 120 and 130 of the mobile network 100 through the switching apparatuses 112 and 113 and provided by the content providing apparatus 300. The contents are stored, and the contents are provided to the mobile node 600 connected to the corresponding wireless access networks 120 and 130 in place of the contents providing apparatus 300.

In particular, the local caching apparatuses 500a and 500b receive the content request message of the mobile node 600 connected to the mobile network 100 through the internet network 200, and the requested content is transmitted to the internet network 200. It provides the mobile node 600 through the mobile network 100 without going through.

At this time, the packet exchanged between the mobile network 100 and the Internet network 200 can be converted from the source address information (for example, IP address, port address) through the NAT (Network Address Translator) device 700 have. The NAT device 700 is used to block access from the outside for security, or to change a private IP address used inside the mobile network 100 to a public IP address that can access the Internet.

Therefore, address information of the mobile node 600 used in the mobile network 100 and address information indicating the mobile node 600 in the content request message received by the local caching apparatuses 500a and 500b from the Internet network 200. (I.e. starting address information) is different.

In addition, the packet transmitted by the mobile node 600 or the packet destined for the mobile node 600 on the mobile network 100 is transmitted through a GTP tunnel unlike the internet network 200.

For example, when the mobile node 600 transmits a content request message to the local caching apparatus 500a, the mobile node 600 transmits source address information (= address information of the mobile node 600) and destination address information. When the IP packet including (= address information of the local caching apparatus 500a) is transmitted to the radio access network 120, the base station (eg, e-node B) of the radio access network 120 is connected to the IP packet. The GTP header including the tunneling identification information (TEID) of the node 600, the UDP header, and the IP header for GTP tunneling are converted into additional mobile packets and transmitted to the core network 110, and the core network 110 is transmitted. Removes the GTP header, the UDP header, and the IP header for GTP tunneling, and transmits the original IP packet transmitted by the mobile node 600 to the local caching apparatus 500a through the Internet network 200. In this case, the source address information of the original IP packet may be changed through the NAT device 700. On the contrary, when the Internet address 200 is transferred from the Internet network 200 to the mobile node 600, the mobile node from the Internet network 200 may be changed. The core network 110 receiving the IP packet destined for the destination 600 converts the GTP header, the UDP header, and the IP header for the GTP tunneling into the additional mobile packet, and then transfers the packet to the wireless access network 120. The radio access network 120 removes the GTP header, the UDP header, and the IP header for GTP tunneling from the received mobile packet, and delivers only the original IP packet to the mobile node 600 through the radio section.

Therefore, in order for the local caching apparatuses 500a and 500b to provide content to the mobile node 600 directly through the mobile network 100 without passing through the internet network 200, the mobile node allocated in the mobile network 100 is provided. Mobile path information including address information of 600 and tunneling identification information of the mobile node 600 should be known.

Accordingly, in order to provide the content through the mobile network 100 through the internet network 200, the local caching apparatuses 500a and 500b are set or assigned to the mobile network 100 with respect to the mobile node 600. After confirming the mobile path information, and generating the data of the content as a mobile packet destined for the mobile node 600 according to the confirmed mobile path information, the mobile network 100 through the switching device (112, 113) ). Here, a detailed method of checking the mobile pass information will be described later.

In addition, the local caching apparatuses 500a and 500b detect a handover of the mobile node 600 while providing content to the mobile node 600, so that the mobile node 600 receives the corresponding wireless access network 120. If it is determined that the data is out of the communicable area of the network 130, the remaining data of the corresponding content is transmitted through the internet network 200. That is, the local caching apparatuses 500a and 500b transmit the remaining data of the content to the internet network 200 by using the address information used by the mobile node 600 in the internet network 200 as a destination.

For example, when the mobile node 600 receiving content from the local caching apparatus 500a in the region A of the wireless access network 120 moves to the region B of the wireless access network 130, the local caching apparatus 500a is provided. ) Transmits the remaining data of the corresponding content to the Internet network 200, which is transmitted from the Internet network 200 to the core network 110 of the mobile network 100, wherein the mobile node 600 processes the handover. Since the state is connected to the wireless access network 130, the remaining data of the content is transferred from the core network 110 to the wireless access network 130, the mobile node 600 through the wireless access network 130 Is passed to.

In addition, the local caching apparatuses 500a and 500b monitor packets transmitted upwardly (transmitted from the mobile node 600 to the core network 110) in the mobile network 100, and thus the contents of the mobile node 600. The DNS query message related to the providing apparatus 300 may be extracted and its address information (public IP) may be transmitted to the mobile node 600 in response to the DNS query message. To this end, the local caching apparatuses 500a and 500b manage domain names of the content providing apparatus 300 that provides the content stored therein, and based on this, the DNS query for the content providing apparatus 300 is performed. You can extract the message.

Next, the configuration and operation of the local caching apparatus according to the present invention will be described in more detail with reference to FIGS. 2 and 3. 2 is a block diagram showing the configuration of a local caching apparatus according to the present invention, Figure 3 is a flow chart showing a mobile content providing method according to the present invention performed by the local caching apparatus.

For reference, the two local caching apparatuses 500a and 500b illustrated in FIG. 1 differ only in an area for providing content, and their configuration and operation are substantially the same. Therefore, hereinafter, the configuration and operation will be described based on one local caching apparatus 500a for convenience of description, but all the configurations and functions described below may be applied to the other local caching apparatus 500b.

Referring to FIG. 2, the local caching apparatus 500a includes a first interface unit 510, a second interface unit 520, a controller 530, and a storage unit 540.

The first interface unit 510 is connected to the internet network 200, and transmits and receives data through the internet network 200. To this end, the first interface unit 510 may include a communication module for performing signal processing according to the TCP / IP protocol. A public IP is assigned to the local caching apparatus 500a connected to the internet network 200 through the first interface unit 510.

The second interface unit 520 is connected to the mobile network 100, mirrors the mobile packet transmitted through the mobile network 100, and also stores the mobile packet generated by the controller 530 in the mobile network ( 100). To this end, the second interface unit 520 is transferred between the packet core device 111 and the DU 121 of the wireless access network 120 through the switching device 112 in association with the connected switching device 112. It may include a mirroring interface module for mirroring the packet to provide to the control unit 530, and an injection interface module for transmitting the mobile packet generated by the control unit 530 to the mobile room (100).

Here, 'mirroring' refers to a technology of copying and bringing a mobile packet transmitted through the mobile network 100 without affecting traffic, and the mirroring interface module is a switching device 112 of the mobile network 100. Copy all the packets flowing on the) to the control unit 530.

The controller 530 is a means for controlling the first half of the mobile content delivery process in the local caching apparatus 500a. The operation of the controller 530 will be described with reference to the flowchart of FIG. 3. In addition, in the following description, it is assumed that the local caching apparatus 500a stores all the contents provided by the content providing apparatus 300.

Basically, the controller 530 receives a content request message of the mobile node 600 from the internet network 200 through the first interface unit 510 (S110).

The content request message received in step S110 may be, for example, an HTTP GET message, and the address information (public IP address used in the Internet network 100) of the local caching apparatus 500a is set as the destination address information. Was sent. In more detail, as the user requests access to a specific site (for example, a site provided by the content providing device 300), the mobile node 600 is assigned to a domain name of the content providing device 300. When a Domain Name Service (DNS) query is attempted, address information (public IP address) of the local caching apparatus 500a is transmitted to the mobile node 600 as a response, and the mobile node 600 responds to the response. The HTTP GET message requesting the content of the specific site is transmitted by using the received address information of the local caching apparatus 500a as a destination.

In this case, the address information of the local caching apparatus 500a may include a global load balancer (GLB) device 400 that distributes load for content delivery in response to a DNS query of the mobile node 600. Or the packet transmitted from the wireless access network 120 to the packet core device 111 of the core network 110 by the controller 530 of the local caching apparatus 500a through the second interface unit 520. As a result, the DNS query for the domain name of the content providing device 300 may be extracted and provided directly to the mobile node 600 in response to the extracted DNS query.

4 is a diagram illustrating a path for receiving a content request message from a mobile node 600 and a path for providing requested content in the mobile content providing method according to the present invention. As such, the content request message (eg, HTTP GET message) transmitted from the mobile node 600 is transmitted to the core network 110 of the mobile network 100 through the wireless access network 120, and the core network 110. It is delivered to the external Internet network 200 by the, and is delivered to the local caching apparatus 500a by the Internet network 200.

Referring back to FIG. 3, the local caching apparatus 500a receiving the content request message checks the mobile pass information allocated by the mobile network 100 with respect to the mobile node 600 that transmitted the content request message (S120). Based on the confirmed mobile path information, data of the requested content is emulated into a mobile packet transmitted to the mobile node 600 and transmitted to the mobile network 100 through the second interface unit 520 ( S130). That is, as shown in FIG. 4, the requested content does not go through the Internet network 200, but from the local caching apparatus 500a through the corresponding wireless access network 120 of the mobile network 100. Is provided directly. Here, the emulation means to configure the data of the content as a mobile packet transmitted from the core network 110 of the mobile network 100 to the wireless access network 120, for example, the destination of the mobile node 600 In this case, a UDP header, a GTP header including tunneling identification information, and an IP header for GTP tunneling may be added to an IP packet starting from the local caching apparatus 500a.

In this case, the controller 530 extracts source address information of the content request message, generates a mapping table 542 mapping the source address information and the confirmed mobile path information, and stores the mapping table 542 in the storage unit 540. When the content is provided, the mobile packet is processed by referring to the mapping table 542. In addition, the content provided to the mobile node 600 is a content serviced by one or more content providers, and receives some or all of the content from the content providing device 300 and stores the content in the storage unit 540. .

That is, the control unit 530 receives a content request message for the content stored in the storage unit 540, and retrieves the data of the requested content from the storage unit 540 to provide the mobile node 600. It is generated as a mobile packet as a destination.

In addition, the controller 530 checks whether the mobile node 600 is handed over while providing the requested content to the mobile node 600 (S140), and the handover of the mobile node 600 is performed. If detected, the remaining data of the content is converted to an Ethernet packet having the source address information of the content request message as a destination and transmitted to the Internet network 200 through the first interface unit 510 (S150).

FIG. 5 is a diagram illustrating a content providing path during handover in the mobile content providing method according to the present invention. Referring to this, the mobile node 600 is different from the area A of the wireless access network 120. In case of moving to the area B of Nm), the handover procedure for the mobile node 600 is performed through the mobile network 100. At this time, a handover related message (eg, Handover request, Handover required, HANDOVER COMMAND) is exchanged, and the control unit 530 of the local caching apparatus 500a performs the wireless access network 120 and the core network (S140). By monitoring the messages exchanged between the 110 through a mirroring or redirection technique, when a handover related message for the mobile node 600 is extracted, the mobile node 600 detects that the handover has been made. The above handover detection method is just an example, and various methods may be used. Then, the remaining data of the requested content is transmitted to the internet network 200 through the first interface unit 510, and the remaining data of the transmitted content is transferred to the mobile network through the internet network 200 and the mobile network 300. Forwarded to node 600. In this case, since the mobile node 600 is handed over by moving to the area B of the wireless access network 130, the mobile node 600 is controlled according to the packet control of the core network 110 confirming the location of the mobile node 600. It is delivered to the 130, it can be stably delivered to the mobile node 600 through the wireless access network (130).

Next, a process of extracting mobile path information for the mobile node 600 in step S120 will be described in more detail with reference to FIGS. 6 to 8.

FIG. 6 is a diagram for describing a packet transmitted between the local caching apparatus 500a and the mobile node 600 through the mobile network 100 and the internet network 200.

As described above, the packet exchanged between the mobile network 100 and the Internet network 200 may be converted through the NAT (Network Address Translator) device 700 address information. Therefore, when the mobile node 600 transmits the content request message to the local caching apparatus 500a, source address information of the content request message transmitted from the mobile network 100 (eg, IP: 10.0.0.1, Port: 4001). And source address information (eg, IP: 217.0.0, Port: 2002) of the content request message received by the local caching apparatus 500a from the Internet network 200 are different from each other.

Therefore, in order for the local caching apparatus 500a to provide content to the mobile node 600 directly through the mobile network 100 without passing through the internet network 200, the mobile node 600 used in the mobile network 100 is used. It is necessary to know the mobile pass information including the address information of). For this purpose, the controller 530 of the local caching apparatus 500a may further perform the process illustrated in FIG. 7 in operation S120.

FIG. 7 is a flowchart illustrating a process of extracting mobile path information for providing content through a mobile network in a mobile content providing method of the present invention.

Referring to this, when the control unit 530 of the local caching apparatus 500a receives a content request message from the Internet network 200 in step S110, one or more of source IP information and source port information may be selected from the received content request message. Source address information information including information is extracted (S210). The extracted source address information is stored in the mapping table 542 of the storage unit 540 as address information for the Internet network of the mobile node 600 that requested the content.

Subsequently, the controller 530 transmits a response message (eg, HTTP response) to the received content request to the mobile node 600 via the internet network 200 (S220). The response message thus delivered is transferred from the internet network 200 to the mobile network 100 and through the mobile network 100 to the mobile node 600.

In this case, the control unit 530 monitors the traffic of the mobile network 100 (230), is transferred from the Internet network 200 to the mobile network 100, the mobile node 600 through the mobile network 100 In step S240, the response message is transmitted.

The monitoring may be performed by mirroring a packet transmitted from the EPC 111 to the wireless access network 120 through the second interface unit 520, and checking the mirrored packets, and extracting a response message transmitted by the EPC 111. This is done by comparing whether the source address information of the packet matches the address information (public IP) of the packet, or includes the message identification information to distinguish whether the message is sent from the response message, and identify the message in each packet. This can be done by making sure that the information is included.

When the response message transmitted by the self is extracted from the mobile network 100, the controller 530 extracts mobile path information allocated to the mobile node from the extracted response message (S250).

The extracted mobile path information is stored in the mapping table 542 as address information of the mobile network 100 of the mobile node 600 (S260).

FIG. 8 is an exemplary diagram of a mapping table 542 used for providing content through a mobile network in the method for providing mobile content according to the present invention. As shown, the mobile path information is transmitted on the mobile network 100. At least one of the assigned IP (Internet Protocol) information, port information, tunneling identification information (TEID) of the mobile node. The mapping table 542 of FIG. 8 shows an example of the configuration of the mapping table in the case shown in FIG. 6, and the source address information (IP: 217.0.0) of the content request message received by the local caching apparatus 500a. , Port: 2002) and mobile path information extracted from the mobile network 100 (IP: 10.0.0.1, port: 4001, tunneling identification information: TEID 0) are mapped. Here, the tunneling identification information (TEID) is an ID for GTP encapsulation of packets transmitted and received between the packet core device 111 and the wireless access network 120 in the mobile network 100 communicating through tunneling. And GTP (GPRS Tunneling Protocol).

Therefore, in step S130 of FIG. 3, the controller 530 of the local caching apparatus 500a provides the mobile path information in order to provide data of the content requested to the mobile node 600 directly through the mobile network 100. That is, a GTP header is generated using Internet Protocol (IP) information, port information, and tunneling identification information (TEID) of the mobile node 600 allocated on the mobile network 100, and the data of the content is read. The mobile packet is converted into a mobile packet including a GTP header, and the mobile packet is transmitted to the mobile network 100 through the second interface unit 520.

Thus, the requested content is delivered to the mobile node 600 as if it were traffic flowing in the mobile network 110.

The mobile content providing method according to the present invention may be implemented in software form readable through various computer means and recorded on a computer readable recording medium. Here, the recording medium may include program commands, data files, data structures, and the like, alone or in combination. Program instructions recorded on the recording medium may be those specially designed and constructed for the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. For example, the recording medium may be an optical recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM), a digital video disk (DVD) Includes a hardware device that is specially configured to store and execute program instructions such as a magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), a flash memory, do. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art. In addition, although specific terms are used in the specification and the drawings, they are only used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention, and are not intended to limit the scope of the present invention.

According to the present invention, in a mobile network including a plurality of geographically separated wireless access networks and a core network connecting them, the local caching apparatus is distributed to a mobile node connected to a specific wireless access network based on the wireless access network. In order to provide content through a local caching apparatus disposed in the wireless access network, the local caching apparatus is simultaneously connected to not only a mobile network but also an internet network, and the mobile network is provided while providing content to the mobile node through a mobile network. When the handover of the node is detected, the remaining portion of the corresponding content is continuously provided to the mobile node through the internet network, so that the content can be delivered seamlessly even when handover to the mobile node.

In addition, the present invention generally returns the address of the cache server that will provide the content to the user terminal when the DNS query for the content request from the user terminal, thereby allowing the user terminal to access the corresponding cache server to request and receive the content. By implementing the content providing service through the mobile network without major modification of the CDN service procedure of the, it is possible to reduce the service implementation cost.

100: mobile network 110: core network
120, 130: wireless access network 200: Internet network
300: content providing device 400: Global Load Balance (GLB) device
500, 500a, 500b: Local caching device 600: Mobile node
700: Network Address Translator (NAT)

Claims (15)

A storage unit storing some or all of each of one or more contents serviced by one or more content providers;
A first interface unit connected to an internet network and transmitting and receiving data through the internet network;
A second interface unit connected to a mobile network and transmitting and receiving data through the mobile network; And
When the content request message of the mobile node for the content stored in the storage unit is received from the internet network through the first interface unit, the mobile path information necessary for delivering data to the mobile node through the mobile network is checked, and the mobile path is passed. And a control unit which transmits data of the requested content using the information to the mobile node through the mobile network. The apparatus of claim 1, wherein the control unit
When the handover of the mobile node is detected while providing the content to the mobile node, local caching apparatus for providing mobile content, characterized in that for transmitting the remaining data of the content to the mobile node through the internet network. The apparatus of claim 1, wherein the control unit
And confirming mobile pass information necessary for delivering data to a mobile node through the mobile network, and emulating data of the content into a mobile packet using the mobile pass information. The method of claim 3,
The second interface unit may further perform mirroring on a mobile packet transmitted through the mobile network.
The control unit
The response message for the received content request message is transmitted to the Internet through a first interface unit, and the mobile packet corresponding to the transmitted response message is extracted from the mirrored mobile packets from the second interface unit, and the extracted mobile packet Local caching apparatus for providing mobile content, characterized in that for verifying the mobile path information from. The apparatus of claim 1, wherein the control unit
The storage unit extracts source address information included in the received content request message and generates a mapping table in which the extracted source address information is mapped to the mobile path information as address information of a mobile node used in an internet network. And store the information in the content providing the content with reference to the mapping table. Receiving, by a local caching device connected to an internet network and a mobile network, a content request of a mobile node connected to the mobile network through an internet network;
Extracting, by the local caching device, mobile path information necessary for delivering data to the mobile node through the mobile network; And
And providing, by the local caching device, the data of the requested content to the mobile node through the mobile network based on the mobile path information. The method according to claim 6,
Checking, by the local caching device, whether the mobile node is handed over; And
And when the handover of the mobile node occurs, transmitting, by the local caching apparatus, the remaining data of the content to the mobile node through the internet network. The method of claim 6, wherein receiving a content request from the mobile node comprises:
And receiving a content request message destined for the address information of the local caching device from the mobile node obtaining the address information of the local caching device in response to a domain name query. 9. The method of claim 8,
And the address information of the local caching device is provided to the mobile node from the local caching device from which the domain name query of the mobile node is extracted by monitoring the traffic of the mobile network. The method of claim 6, wherein the mobile pass information is
And at least one of an internet protocol (IP) address and a port address of the mobile node allocated on the mobile network, and tunneling identification information. The method of claim 6, wherein the extracting of the mobile path information comprises:
Transmitting a response message to the received content request to the mobile node through the internet network;
Monitoring the traffic of the mobile network and extracting the response message transmitted from the internet network to the mobile network and delivered to the mobile node through the mobile network; And
And extracting mobile path information assigned to the mobile node from the extracted response message. The method of claim 11, wherein extracting the mobile path information comprises:
Extracting source address information including at least one of a source IP address and a source port address from the received content request message; And
And mapping and storing the source address information of the extracted content request message and the extracted mobile path information. The method of claim 11, wherein the extracting of the response message transmitted through the mobile network comprises:
And checking the source address information of the mobile packet transmitted from the mobile network, and extracting a packet that matches the address of the local caching apparatus. 12. The method of claim 11,
In the step of transmitting a response message for the received content request to the mobile node via the Internet network, the local caching server includes the message identification information in the response message,
Extracting the response message transmitted through the mobile network; extracting a mobile packet including the message identification information as the response message. The method of claim 6, wherein providing data of the requested content to the mobile node through the mobile network comprises:
And emulating a packet of the content into a mobile packet transmitted from the mobile network to the mobile node using the mobile path information.

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