KR20180110565A - Method for controlling of contents transmition, apparatus thereof, computer-readable medium and program thereof - Google Patents

Abstract

The present invention relates to a content transmission control method in a CDN service. The content transmission control method comprise the steps of: receiving a content request message including a mobile descriptor from a terminal; identifying an edge node corresponding to base station information included in the mobile descriptor; and transmitting a streaming change message to the edge node or the terminal so that the identified edge node can transmit the content to the terminal. According to the present invention, a core node receives the base information on an environment placed from a plurality of edge nodes in advance to be able to manage the base information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a content transmission control method, an apparatus therefor, a computer readable recording medium storing the program,

The present invention relates to a content transmission control method in a CDN service, and more particularly, to a method of controlling content transmission in a CDN service, in which a core node managing a plurality of edge nodes transmits an edge node to transmit content to a terminal on behalf of a content server, The present invention relates to a content transmission control method capable of providing a CDN service more easily by confirming the use of the CDN service by confirming the use of the CDN service.

2. Description of the Related Art [0002] In recent years, according to the improvement of performance of a user terminal such as a smart phone and development of a mobile communication technology, a user accesses a web server provided by a contents provider (CP) , Audio, applications, and so on.

However, while the number of Web servers provided by a content provider (CP) is limited, the number of users wishing to access the web server is rapidly increasing. As a result, various problems such as data loss, bottleneck, transmission delay, .

A CDN (Contents Delivery Network) service is introduced to solve such a problem.

The CDN service is a service for reliably delivering various types of contents such as photographs, movies, and music videos to a user terminal. The CDN service is a service that is concentrated in a web server of a content provider remote from the user terminal, It is necessary to copy some or all of the contents frequently in advance to edge nodes distributed in a plurality of Internet service provider (ISP) point-of-presence (PoP) Means an edge node located closest to the terminal when a content request for the terminal is generated, and can provide the content to the terminal on behalf of the content provider.

The CDN service has an advantage that the edge node located nearest to the location of the terminal provides the contents, thereby improving the response speed of the contents request of the terminal and more stably providing the contents.

However, up to now, the CDN service operates based on HTTP. Accordingly, edge nodes supporting the CDN service also operate on the basis of HTTP, which makes it difficult to control content transmission more effectively in a rapidly expanding mobile environment.

In particular, the base station for mobile communication may be continuously added or may disappear in some cases, but current edge nodes are distributed and arranged near the core node, which makes it difficult to recognize the changed base station environment.

Therefore, it is necessary to develop a CDN service technology that can select an edge node to transmit contents to the UE more easily in consideration of a converted base station environment and manage an edge node based on the base station information.

Korean Patent Laid-Open No. 10-2011-0092869, published on Mar. 31, 2013 (name: CDN Service Method and System via Wireless Network)

The present invention has been proposed in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a content transmission control method in which a core node can receive and manage base station information on an environment located from a plurality of edge nodes in advance, Readable recording medium and a program.

In addition, according to the present invention, when transmitting a content request message, the terminal transmits base station information on the currently accessed cell environment in the content request message and transmits the content request message to the core node on the basis of the base station information An edge node can be assigned to a content transmission control method, an apparatus therefor, and a computer readable recording medium and a program recorded thereon.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to another aspect of the present invention, there is provided a method of controlling content transmission in a core node that controls a plurality of edge nodes, the method comprising: Receiving a content request message; Identifying an edge node corresponding to base station information included in the mobile descriptor; And transmitting the streaming change message to the edge node or the terminal so that the identified edge node can transmit the content to the terminal.

Receiving a coverage message from the edge node before receiving the content request message; Confirming base station information in the coverage message; And matching and storing the identified base station information and the identification information of the edge node.

The step of identifying the edge node may include: identifying identification information of an edge node stored in the mobile node to match the base station information included in the mobile descriptor; And selecting an edge node that is caching content among the identified edge nodes.

In addition, the coverage message may include at least one of cell identification information (cell_id) and IP address information.

Also, the mobile descriptor may include at least one of terminal identification information, IP address information, and cell identification information (current_cell_id).

According to another aspect of the present invention, there is provided a content transmission control method including: transmitting, by a terminal, a content request message including a mobile packet to a core node in response to a content request from a user; Transmitting the content request message to an edge node included in the streaming change message when a streaming change message is received from the core node in response to the content request message; And receiving and reproducing the content from the edge node.

Further, the present invention can provide a computer-readable recording medium on which a program for executing the above-described method is recorded.

Further, the present invention can provide a computer program stored in a computer-readable recording medium which is implemented to carry out the method as described above.

According to an aspect of the present invention, there is provided a core node comprising: a core communication unit for performing communication with a terminal, a content server, and a plurality of edge nodes; And an edge node corresponding to the base station information included in the mobile descriptor when the content request message including the mobile descriptor is transmitted from the terminal through the core communication unit and transmits the content to the terminal And a core control unit for controlling the core communication unit to transmit a streaming change message to the edge node or the terminal through the core communication unit.

When the coverage message is received from the plurality of edge nodes, the core control unit checks the base station information in the coverage message, then matches the identified base station information with the identification information of the corresponding edge node, The content caching list including the content caching information may be matched and stored.

According to the content transmission control method, the apparatus for the same, and the computer readable recording medium and the program recorded thereon, the core node receives and manages base station information on the environment located from a plurality of edge nodes in a predetermined cycle unit in advance, It is possible to more easily manage the edge node in consideration of the base station environment that can be changed to the edge node.

In addition, according to the present invention, when transmitting a content request message, the terminal transmits base station information on the currently accessed cell environment in the content request message, thereby enabling the core node to check the location of the terminal based on the base station information And it is possible to more quickly confirm the optimal neighboring edge node providing the contents to the terminal based on the base station information.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is a system diagram illustrating a content transmission control system according to an embodiment of the present invention.
2 is an exemplary diagram illustrating MMT contents according to an embodiment of the present invention.
3 is a data flow diagram illustrating a content transmission control method according to an embodiment of the present invention.
4 is a data flow diagram illustrating a content transmission control method according to the terminal-based change method of the present invention.
5 is a data flow diagram illustrating a content transmission control method according to the server-based change method of the present invention.
6 is a flowchart illustrating a content transmission control method according to an embodiment of the present invention.
7 is a block diagram illustrating a main configuration of a core node according to an embodiment of the present invention.
8 is a block diagram illustrating a main configuration of an edge node according to an embodiment of the present invention.
9 is a flowchart illustrating a content transmission control method in a terminal according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention. This is to omit the unnecessary description so as to convey the key of the present invention more clearly without fading. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, it should be understood that the invention is not limited to the specific embodiments thereof, It is to be understood that the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

Now, a content transmission control method according to an embodiment of the present invention will be described in detail with reference to the drawings. Here, the same reference numerals are used for similar functions and functions throughout the drawings, and a duplicate description thereof will be omitted.

Prior to the description, the client apparatus described in the specification of the present invention may be implemented in various forms. For example, mobile terminals such as a smart phone, a tablet PC, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and an MP3 player, as well as a smart TV, And the like can be used. Any device can be applied to the client device of the present invention as long as it is a device of a user who requests MMT contents to a content server through a network and receives and uses the MMT contents.

In addition, the content server described in the present invention is for providing various kinds of contents such as photographs, video, audio, applications and the like to a client device. The content server includes at least one It is possible to receive and manage contents, transmit corresponding contents according to a request of a client device, and preferably provide contents agreed with a communication service provider providing CDN service. The content server may exemplify a web server or a web application server (WAS).

In addition, any of the above-described contents can be included in the contents of the present invention as long as they can be expressed by a specific address (e.g., URL) on the network. For example, if the entire web site is represented by one URL, it can be distributed as one content through the CDN service. In addition, the contents of the present invention can be defined according to an MMT (MPEG Media Transport) protocol, but the present invention is not limited thereto.

Hereinafter, a content transmission control system supporting a content transmission control method according to an embodiment of the present invention will be described.

FIG. 1 is a system view for explaining a content transmission control system according to an embodiment of the present invention. FIG. 2 is an exemplary view for explaining MMT contents according to an embodiment of the present invention.

1, a content transmission control system according to an embodiment of the present invention includes a terminal (MMT UE) 100, a network including a plurality of edge nodes (Edge MANE) 350 and a core node And an original contents server (200). Here, MANE means MMT Aware Network Entity.

The main configuration of the content transmission control system according to the present invention will be briefly described. First, the terminal 100 transmits a content request message requesting specific content to the content server 200 through a network according to a request of a user . Here, the content request message of the terminal 100 may be generated according to a request for a specific content from a user. For example, when a user input such as a URL (Uniform Resource Locator) for a specific content or a user input for executing an application capable of reproducing the content is confirmed, the terminal 100 transmits a name server And obtain the address information (IP address) of the core node 340 that manages the content. The terminal 100 transmits a content request message for requesting content to the core node 340 and receives the content according to the control of the core node 340 to use the content.

In particular, the terminal 100 of the present invention is a user device capable of supporting an MMT (MPEG Media Transport) protocol and requests MPEG content streaming data (hereinafter referred to as MMT content) to the content server 200 , And may receive and reproduce the MMT content transmitted by the content server 200. [

Also, the terminal 100 according to the embodiment of the present invention can transmit a content request message to the core node 340, including a mobile descriptor. Here, the mobile descriptor may include information about the terminal 100 (identification information, IP address, etc.), connected cell identification information (current_cell_id), and the like.

The content server 200 provides various contents such as photographs, video, audio, applications, etc. to the terminal 100. The contents server 200 receives at least one content from a contents provider (CP) And provides contents to a plurality of terminals 100 through a network. In particular, the content server 200 of the present invention can provide MMT content to the terminal 100 in accordance with the control of the core node 340. In addition, the content server 200 of the present invention provides content to the streaming server (not shown) in cooperation with a streaming server (not shown), converts the MMT content into a streaming server If the content server 200 supports the streaming function, the content server 200 may provide the content to the terminal 100 in a direct streaming format.

In the following description, it is assumed that the content server 200 directly provides content for convenience, but it should be noted that the content server 200 can operate in conjunction with a separate streaming server (not shown) as described above.

A plurality of edge nodes 350 and a core node 340 distributed on a network serve to control the content flow between the terminal 100 and the content server 200. The plurality of edge nodes 350 are located between the access network 330 and the core network 320 and the core node 340 is located between the core network 320 and the Internet network 310. However, A plurality of edge nodes 350 and a plurality of core nodes 340 may be arranged on the network in various forms if they can control the content flow between the terminal 100 and the content server 200 .

In addition, the core node 340 of the present invention plays a role of managing a plurality of edge nodes 350 distributed on the network. In particular, the core node 340 of the present invention may periodically receive an Edge Cod Coverage (ECC) from a plurality of edge nodes 350. The information on the cell environment in which the edge node 350 is located can be periodically updated and managed using the base station information included in the coverage message.

At this time, the coverage message may include cell ID information, cell address information, and IP address information, which are neighbor base station information on which the edge node 350 is located. In an environment where the base station is continuously converted, Can easily identify the location of the edge node 350 based on the base station information.

In addition, the core node 340 of the present invention can control the content transmission process. In particular, the core node 340 of the present invention can confirm a content request message transmitted from the terminal 100. The content request message transmitted from the terminal 100 includes a mobile descriptor and the core node 100 can confirm the base station information on the cell to which the terminal 100 is currently connected through the mobile descriptor. The core node 340 of the present invention can identify the edge node 350 corresponding to the confirmed base station information through the coverage message.

When the determined edge node 350 is caching the content, the core node 340 controls the edge node 350 to transmit the content to the terminal 100 on behalf of the content server 200 . To this end, the core node 340 of the present invention can transmit a streaming change message to the edge node 350 or the terminal 100, and can control the process of blocking the content transmitted from the content server 200 .

On the other hand, when the edge node 350 is not identified or the edge node 350 is not caching the content, the core node 340 transmits the content request message delivered from the terminal 100 to the content server 200 When the content is delivered from the content server 200, the edge node 350 located on the path can control to transmit the cache information message in the content so that the edge node 350 can cache the content.

In addition, the core node 340 of the present invention may play a role of managing contents cached by a plurality of edge nodes 350, and accordingly, the core node 340 of the present invention may include an edge It is possible to accurately select the edge node 350 caching the corresponding content when the node 350 is selected.

To this end, the core node 340 of the present invention transmits the edge node 350 located on the path to the base station 300 when the content transmitted from the content server 200 to the terminal 100 exists, The edge node 350 may notify the edge node 350 to cache the content. If it is determined that the caching of content is completed in the edge node 350, the core node 340 may update and store the content caching list corresponding to the edge node 350. [ In addition, the core node 340 of the present invention can periodically receive information on the held content from the edge node 350, stores the received information in the form of a content caching list corresponding to the edge node 350 Can be managed.

In addition, the content caching list managed by the core node 340 of the present invention may be configured by matching identification information that can identify the content corresponding to the identification information of the edge node 350. In addition, when receiving information on the held content from the edge node 350, the information may be included in the coverage message and transmitted to the core node 340.

The edge node 350 of the present invention is an apparatus for storing and managing a part or all of content in advance according to a predetermined content distribution policy of content served from the content server 200. The edge node 350 may be referred to as a cache device, .

The edge node 350 of the present invention can transmit content to the terminal 100 on behalf of the content server 200 under the control of the core node 340 when the terminal 100 caches the content requested by the terminal 100 . In particular, when receiving a streaming change message from the core node 340, the edge node 350 of the present invention identifies the terminal 100 through the streaming change message and then transmits the streaming change message to the corresponding terminal 100, The content that is being cached can be transmitted. In addition, the edge node 350 of the present invention can transmit content cached to the terminal 100 according to a request of the terminal 100 receiving the streaming change message from the core node 340.

In addition, the edge node 350 of the present invention can monitor content delivered to the terminal 100 or content delivered from the terminal 100, and when the monitored content is not cached, caching is performed You may.

In addition, the edge node 350 according to the exemplary embodiment of the present invention periodically constructs a coverage message and transmits the coverage message to the core node 340. The coverage message transmitted to the core node 340 includes information on the content being cached .

In addition, the edge node 350 according to the embodiment of the present invention can store and manage the divided MMT contents by dividing the MMT contents into units of a media processing unit (MPU) , And may transmit the divided MMT contents to the terminal 100 in units of MPUs.

2, the asset 505 of the present invention may be constituted by at least one MPU 506. In this case, Here, the asset 505 means the largest logical data unit, which means an element of a package that encodes encoded media data such as audio, video or web page data with timed or non-timed nature. Such an asset 505 means a data entity that contains data with the same transfer characteristics. For example, if the MMT package is the largest entity among the data models defined in the MMT functional area, it means one independent content, such as a movie, the asset 505 stores audio data, video data, Script data, and the MMT package, which is a set of the assets 505, may be one content.

The asset 505 includes a plurality of MPUs 506, and a plurality of MPUs 506 represent logical data objects including the same asset ID. This MPU 506 may be encoded media data that can be processed completely and independently, and the processing of the MPU may mean packetization for encapsulation or delivery to a package. This MPU 506 may include one or more access units for timed data. Here, an access unit (AU) is the smallest data entity that can have time information. The MPU 506 may also be configured to include portions of data that do not have access unit boundaries for non-timed data. This MPU 506 is a coded media data unit that can be processed completely and independently, and can be composed of a header 507 and coded data 508. In addition, the MPU 506 of the present invention may further be configured as a Media Fragment Unit (MFU).

The MMT contents of the present invention can be transmitted to the terminal 100 in a streaming form, and in this case, can be delivered based on the MPU. That is, the content server 200 can sequentially transmit the MMT contents to the terminal 100 on an MPU-based basis, and the terminal 100 can receive MMT contents in units of MPUs received sequentially and reproduce them. However, the MMT contents of the present invention are not necessarily limited to the MPU unit, and the processing of the present invention may be performed on a media fragment unit (MFU) basis according to a system implementation method.

It should be noted that the content according to an exemplary embodiment of the present invention is defined according to the MMT protocol, but it is not limited thereto, and it should be noted that the content may be defined according to a protocol having the same or similar characteristics as the MMT protocol do.

The network in which the plurality of edge nodes 350 of the present invention are distributed at the main points means a communication network for transmitting and receiving information between the terminal 100 and the content server 200. In particular, Type, e.g., an intranet network, a mobile communication network, a satellite communication network, and the like.

The network may include an external network such as the Internet 310 connected to a mobile network including a plurality of access networks 330 and a core network 320. The wired / wireless access network constituting the mobile network is an access network that performs wired / wireless communication with the terminal 100 and includes a plurality of base stations such as a base station (BS), a base transceiver station (BTS), a node B, an eNodeB, A Base Station Controller (BSC), and a Radio Network Controller (RNC).

Alternatively, the digital signal processing unit and the radio signal processing unit integrally implemented in the base station may be divided into a digital unit (hereinafter referred to as DU) and a radio unit (hereinafter referred to as RU) A plurality of RUs (not shown) may be provided in each of the regions, and a plurality of RUs (not shown) may be connected to a centralized DU (not shown).

In addition, the core network 320 configuring a mobile network together with a wire / wireless access network plays a role of connecting a wired / wireless access network 330 and an external network, for example, the Internet network 310. As described above, the core network 320 is a network system that performs main functions for mobile communication services such as mobility control and switching between wired and wireless access networks 330. The core network 320 includes circuit switching or packet switching ), And manages and controls the packet flow in the mobile network. In addition, the core network 320 may manage inter-frequency mobility and perform functions for interworking with traffic in the access network 330 and the core network 320, and with other networks, such as the Internet network 310. The core network 320 may also include a Mobile Switching Center (MSC), a Home Location Register (HLR), a Mobile Mobility Entity (MME), and a Home Subscriber Server (HSS).

In addition, the Internet network 310 refers to a public network, that is, a public network, in which information is exchanged according to the TCP / IP protocol. The Internet network 310 is connected to the content server 200, May be provided to the terminal 100 via the core network 320 and the wire / wireless access network 330 or may be provided to the plurality of edge nodes 350 according to a predetermined distribution policy.

As described above, the network structure of the present invention has been briefly described. The network is coupled with the edge node 350 to store computing resources such as hardware, software, and the like, Cloud computing network. Here, cloud computing refers to a computer environment in which information is permanently stored on a server on the Internet and temporarily stored in a client terminal such as a desktop, a tablet computer, a notebook, a netbook, or a smart phone. Cloud computing, Refers to a computer environment access network that stores information on a server on the Internet and makes the information available anytime and anywhere through various IT devices. Such a network may be classified into a Code Division Multiple Access (CDMA), a Wideband Code Division Multiple Access (WCDMA), and a Wideband Code Division Multiple Access (WCDMA) network as well as a closed network such as a LAN (Local Area Network) , Global System for Mobile Communications (GSM), Long Term Evolution (LTE), and Evolved Packet Core (EPC), and next-generation networks and cloud computing networks to be implemented in the future.

Hereinafter, a content transmission control method according to an embodiment of the present invention will be described.

3 is a data flow diagram illustrating a content transmission control method according to an embodiment of the present invention. 3, only one content server 200, an edge node 350, and the terminal 100 are shown in the figure before the content transmission control method according to an embodiment of the present invention is described. However, There may be a plurality of content servers 200, edge nodes 350 and terminals 100, and basically exchange identification information for identifying itself.

The core node 340 controls and manages a plurality of edge nodes 350. Although only one core node 340 is shown in the drawing, the plurality of core nodes 340 may include a plurality of edge nodes 350 ). The plurality of core nodes 340 may be connected to different content servers 200. The terminal 100 may determine which core node 340 manages the content to be requested by the terminal 100, (340).

3, the core node 340 periodically receives a coverage message from a plurality of edge nodes 350 distributed in an access network (refer to FIG. 3) S101). The core node 340 can update and manage the base station information about the cell environment in which the edge node 350 is located through the coverage message.

As shown in Table 1 below, the edge message coverage (ECC) of the present invention includes cell ID (cell ID) and IP address information, which are information on an adjacent cell environment And the base station information.

A description of the parameters constituting the ECC message is as follows.

message_id It indicates the message ID. The length of this field is 16 bits. version It indicates the version of the messages. MMT receiving entity may check whether the received message is new or not. The length of this field is 8 bits. length It indicates the length of the messages in bytes, counting from the beginning of the next field to the last byte of the ECC message. The value "0" should not be used for this field. ip_addr__flag It indicates whether IP address is included or not. If it is set to 1, the IP address is included. cell_id__flag It indicates whether the cell id is included or not. If it is set to 1, the cell id is included. ipv4_src_addr This field is the IPv4 address of the sender of the packet. The length of this field is 32 bits. ipv6_src_addr This field is the IPv6 address of the sender of the packet. The length of this field is 128 bits. cell_id It indicates the current cell ID (CGI for 2G / 3G and eCGI for 4G) as defined in 3GPP TS 36.331. It is assigned a 15 decimal digit code which corresponds to totally 60 bits where 4 bits are assigned for each 1 decimal digit.

When the coverage message as described above is received, the core node 340 can confirm the base station information included in the coverage message, that is, the cell identification information (cell_id) and the IP address information (ipv4_src_addr or ipv6_src_addr) (S103).

The identified base station information is matched with the identification information of the edge node 350 that received the coverage message and is stored (S105).

This process can be done periodically. For example, the edge node 350 may generate and transmit a coverage message to the core node 340 at predetermined intervals such as one day, one week, or the like.

In addition, the edge node 350 may generate and send a coverage message to the core node 340 under certain circumstances. For example, if the neighboring cell environment is changed, the coverage message may be generated and reported to the core node 340.

In addition, the coverage message of the present invention may be generated by including information on the content cached by the edge node 350 according to the implementation method. In this case, when the content of the present invention is defined according to the MMT protocol, it may include MMT content identification information (package ID, asset ID), etc. In case of caching in units of MPU, have.

As described above, in one embodiment of the present invention, the edge node 350 may transmit a coverage message including the base station information to the core node 340, and may further include the content information.

Then, the terminal 100 generates a content request message and transmits the generated content request message to the core node 340 (S107). The terminal 100 of the present invention can confirm the information of the core node 340 that manages the content when a content request is generated from the user through a DSN query process or the like and configure a content request message including a mobile descriptor To the core node 340.

In step S111, the core node 340 confirms the mobile descriptor included in the content request message and confirms the base station information included in the mobile descriptor.

The mobile descriptor of the present invention may include information related to the MMT receiving entity, i.e., the MS 100, such as MSISDN, IMSI, etc., when the MMT receiving entity is a mobile device. For example, if the MMT receiving entity is a cellular mobile device, it may include mobile identification information of the MSISDN being defined in 2GPP.

Also, the terminal 100 may include cell identification information (current_cell_id) currently connected thereto, and a mobile descriptor may be defined including IP information about the base station according to an implementation method.

The parameters defined in the mobile information descriptor of the present invention are shown in Table 4 below.

parameter Explanation descriptor_tag a tag value indicating the type of this descriptor. The value of this field is 0x0004 in Table 63. descriptor_length It indicates the length in bytes of the next byte after this field. MSISDN_flag It indicates whether MSISDN is included or not. If it is set to '1' the descriptor is included. IMSI_flag It indicates whether IMSI is included or not. If it is set to '1' the descriptor is included. current_cell_id_flag It is whether current_cell_ID is included or not. If it is set to '1' the descriptor is included. MSISDN It indicates the Mobile Subscriber International Subscriber Directory Number (MSISDN) number of the MMT receiving entity, and it is defined as ITU-T specification E.164. The length of this field is 15 decimal digits, which is coded into 60 binary digits where each decimal digit is assigned 4 binary bits. IMSI It indicates the International Mobile Subscriber Identity (IMSI) number of MMT receiving entity, and it follows the format as defined in 3GPP TS 23.003. The length of this field is 15 decimal digits, which is coded into 60 binary digits where each decimal digit is assigned 4 binary bits. current_cell_id It indicates the current cell ID (CGI for 2G / 3G and eCGI for 4G) as defined in 3GPP TS 36.331. It is assigned a 15 decimal digit code which corresponds to totally 60 bits where 4 bits are assigned for each 1 decimal digit.

In this way, the terminal 100 of the present invention transmits a cell descriptor (current_cell_id) or a mobile descriptor for confirming the base station information including the base station IP information, The edge CDN service can be enabled.

The core node 340 which has confirmed the base station information (current_cell_id or base station IP information) included in the mobile descriptor can check the edge node 350 matched with the previously stored base station information in step S105 (S111) .

If the edge node 350 matched with the base station information is not confirmed or the edge node 350 matching the base station information does not cache the corresponding content, the core node 340 transmits the content The content server 200 may transmit the content request message to the content server 200 to support the content server 200 to provide the content to the terminal 100.

If the edge node 350 is caching content in step S111, it is more stable and more reliable for the edge node 350 located near the terminal 100 to transmit the content held in the terminal 100 The core node 340 generates a streaming change message so that the corresponding edge node 350 can provide the content to the terminal 100 in operation S115 and can perform operations thereafter have.

That is, the core node 340 of the present invention can identify the edge node 350 where the cell to which the terminal 100 is currently connected based on the information of the edge node 350 identified, 350) is caching content. At this time, if it is determined that there is an edge node 350 caching the content in the corresponding cell, a streaming change message is transmitted to the corresponding edge node 350 to replace the content server 200 And can be controlled to be transmitted to the terminal 340.

At this time, the core node 340 of the present invention can perform a server-based change method for delivering a streaming change message to the edge node 350, and perform a terminal-based change method for directly transmitting the streaming change message to the terminal 100 It is possible.

First, the terminal-based changing method will be described with reference to FIG.

4 is a data flow diagram illustrating a content transmission control method according to the terminal-based change method of the present invention.

Referring to FIG. 4, after step S115 of FIG. 3, the core node 340 of the present invention transmits a streaming change message including identification information of the identified edge node 350 to the terminal 100 (S201) .

The terminal 340 receiving the streaming change message from the core node 340 can identify the edge node 350 through the corresponding streaming change message and transmit the content request message to the identified edge node 350 S203).

Then, the terminal 100 can receive the content from the edge node 350 in response thereto (S205).

The edge node 350 may transmit a response message to the core node 340 indicating that the content transmission is completed when the transmission of the content cached by the terminal 100 is completed at the request of the terminal 100 in operation S207.

The receiving core node 340 may perform various statistical processing based on the response message. For example, it is possible to confirm whether or not a request for content cached in the specific edge node 350 has occurred more than a certain number of times. The caching policy for the edge node 350 is established or changed according to the result of the statistical processing .

Hereinafter, a server-based change method will be described.

5 is a data flow diagram illustrating a content transmission control method according to the server-based change method of the present invention.

Referring to FIG. 5, after step S115 of FIG. 3, the core node 340 of the present invention transmits a streaming change message directly to the identified edge node 350 (S301). At this time, the streaming change message may include the terminal identification information and the content information to be transmitted to the terminal 100.

The edge node 350 checks the terminal 100 according to the streaming change message in step S303 and then transmits the content to the terminal 100 in step S305 according to an instruction from the core node 340. [

Then, when the transmission of all the contents is completed, the edge node 350 can transmit a response message to the core node 340.

Hereinafter, the content transmission control method according to the embodiment of the present invention will be described from the viewpoint of the core node 340. [

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

Referring to FIGS. 1 and 6, a content transmission control method according to an embodiment of the present invention may be performed by the core node 340.

First, the core node 340 of the present invention receives a coverage message from a plurality of edge nodes 350 (S401). The core node 340 may periodically receive the coverage message and may receive a coverage message upon occurrence of an event at the edge node 350. [

The coverage message of the present invention may be configured to include base station information including cell identification information (cell ID) and IP address information, which is information on an adjacent cell environment of the edge node 350, and content caching information As shown in FIG.

The core node 340 can update the information about the edge node 350 based on the information and manage the edge node 350 (S403). At this time, the core node 340 of the present invention can store and store the base station information and the identification information of the edge node 350. Accordingly, even if the cell environment around the edge node 350 continuously changes, the edge node 350 Can be quickly identified.

In addition, the core node 340 of the present invention can store and manage information about the content held by the edge node 350 in the form of a content caching list corresponding to the identification information of the edge node 350.

Herein, the information about the held content cached by the edge node 350 can be confirmed through the content caching information included in the coverage message, and when there is content delivered from the content server 200 to the terminal 100 , It may be confirmed as the core node 340 directly transmits the content caching command to the edge node 350 located on the corresponding path and receives a response from the edge node 350 from the edge node 350.

Thereafter, the core node 340 of the present invention can confirm the content request message transmitted from the terminal 100 (S405).

The content request message may include a mobile descriptor in which base station information is defined as information on a cell environment to which the subscriber station 100 is connected. The core node 340 of the present invention checks the base station information, Stored edge node 350 in correspondence with the base station information (S407).

At this time, if there are a plurality of pre-stored edge nodes 350 corresponding to the base station information, the core node 340 can select the optimal edge node 350 through whether or not the content is cached. Here, for convenience of explanation, an edge node caching content is referred to as a neighboring edge node in order to distinguish it from an edge node that is not caching.

The core node 340 checks whether there is an adjacent edge node, i.e., whether or not there is an edge node caching the content among the previously stored edge nodes corresponding to the base station information (S409) If the node does not exist, the core node 340 transmits a content request message to the content server 200 (S411).

The core node 340 identifies an edge node located on the path between the content server 200 and the terminal 100 among the pre-stored edge nodes corresponding to the base station information received from the terminal 100 (S413) The edge node 350 transmits the content caching command to the checked edge node 350 in step S415 so that the edge node 350 can perform the process of mirroring and caching the content delivered from the content server 200 to the terminal 100 have.

At this time, if there are a plurality of edge nodes identified, the core node 340 can transmit a content caching command to all of the edge nodes 350, and the edge node 350 Only the optimal edge node 350 may be selected in consideration of the caching storage space and the content caching command may be transmitted only to the selected edge node 350.

Thereafter, when content is delivered from the content server 200 to the terminal 100, the edge node 350 can copy and cache the content according to the content caching command. When the caching is completed, the edge node 350 transmits a response message Can be transmitted. At this time, the response message can be transmitted through the coverage message, and the core node 340 receiving the response message can update and manage the information about the content cached by the edge node 350 (S419).

In addition, the core node 340 may set a caching policy for the content to be delivered according to the implementation method.

That is, when the content delivered from the content server 200 is content according to the MMT protocol, the core node 340 can set a content caching policy for each of the plurality of edge nodes 350 located on the path. In particular, the core node 340 may set a caching policy in units of MPU of the MMT contents. For example, MPU1 and MPU2 are set to 'allow edge node 1 caching', and MPU3 is set to 'edge node 2 caching allowed' Edge node 1 caches only MPU1 and MPU2 that are permitted to be cached, and edge node 2 caches only MPU3, and then bypasses the remaining MPUs.

On the other hand, if it is confirmed in step S409 that there is a neighboring edge node caching content, the core node 340 transmits a streaming change message (S417). The streaming change message may be transmitted to the neighboring edge node or may be transmitted to the terminal 100, as described with reference to FIGS.

Thereafter, when a response message is received from the adjacent edge node (S419), the core node 340 can confirm that the transmission of the content requested to the terminal 100 is completed.

The contents transmission control method according to the embodiment of the present invention has been described above.

Hereinafter, the main configuration of the core node 340 according to the embodiment of the present invention will be described.

7 is a block diagram illustrating a main configuration of a core node according to an embodiment of the present invention.

Referring to FIG. 7, the core node 340 of the present invention may include a core communication unit 341, a core control unit 242, and a core storage unit 343.

The core node 340 may periodically receive a coverage message from a plurality of edge nodes 350 distributed around the terminal 100 through the core communication unit 341. The core control unit 342 may receive a coverage message Information can be stored in the core storage unit 343 and managed.

The core node 340 of the present invention is located between the content server 200 and the terminal 100 and is connected to the content server 200 via the core node 340 via the core communication unit 341. [ To the content request message. The core control unit 342 of the core node 340 can confirm the base station information through the mobile descriptor included in the content request message and identify the matched edge node 350 corresponding to the confirmed base station information, It is possible to confirm whether or not the corresponding edge node 350 is caching the content.

The core control unit 342 of the core node 340 transmits a streaming change message to the corresponding edge node 350 or the terminal 100 so that the content is transmitted from the edge node 350 to the terminal 340, Lt; / RTI >

Hereinafter, the edge node 350 according to the embodiment of the present invention will be described.

8 is a block diagram illustrating a main configuration of an edge node according to an embodiment of the present invention.

8, an edge node 350 according to an embodiment of the present invention may include a cache communication unit 351, a cache control unit 352, and a cache storage unit 353.

First, the cache communication unit 351 monitors various data transmitted and received through a network, and transmits / receives data. In particular, the cache communication unit 351 of the present invention may transmit a coverage message to the core node 340 and may transmit the content transmitted to the terminal 100 by the content server 200 according to a command received from the core node 340 And mirror it and support it to be stored in the cache storage unit 353.

To this end, the cache communication unit 351 may include a mirroring module and an injection module although not shown. The mirroring module copies the data transferred through the network and transfers the copied data to the cache controller 352. The injection module transmits data received from the cache control unit 352 to the core node 340 or the terminal 100 through the network.

The cache control unit 352 controls the overall operation of the edge node 350. In particular, the cache controller 352 of the present invention may configure a coverage message and transmit the coverage message to the core node 340. The cache control unit 352 may control the process of transmitting the content requested by the terminal 100 to the terminal 100 on behalf of the content server 200.

The cache control unit 352 may control the process of mirroring and caching the content to be transmitted to the terminal 100 by the content server 200 or another edge node.

The contents stored in the cache storage unit 353 may be defined according to the MMT protocol, and may be stored and managed in MPU units. The cache storage unit 353 may temporarily store various data generated during execution of the application program, including an application program required for the functional operation according to the embodiment of the present invention. The cache storage unit 353 may include a program area and a data area. The program area stores information such as an operating system (OS) for driving the edge node 350. The data area is an area in which data generated according to use of the edge node 350 is stored. Various commands for processing MMT contents can be stored as described above. The cache storage unit 353 may be a flash memory, a hard disk, a memory of a multimedia card micro type (e.g., SD or XD memory), a RAM, (ROM), and the like.

The main configuration of the edge node 350 according to the embodiment of the present invention has been described above.

Hereinafter, a content transmission control method according to an embodiment of the present invention will be described from the viewpoint of the terminal 100. [

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

Referring to FIG. 9, when a content request is generated from a user, the terminal 100 of the present invention generates a content request message including a mobile descriptor and transmits the content request message to the core node 340 (S501). For example, the terminal 100 of the present invention can confirm that a content request is generated from a user through a user input such as a URL (Uniform Resource Locator) for specific contents or a user input for executing an application capable of playing the content After that, the terminal 100 accesses a name server such as a DNS (Domain Name Server) and obtains an IP address of the core node 340 that manages the corresponding content. The terminal 100 constructs a content request message for requesting content to the core node 340. At this time, the terminal 100 of the present invention generates a content request message including a mobile descriptor. At this time, the mobile descriptor may include information (identification information, IP address, etc.) about the terminal 100, connected cell identification information (current_cell_id), and the like. The terminal 100 of the present invention transmits a content request message including the mobile descriptor to the core node 340.

When the edge node 350 capable of providing the content is identified on behalf of the content server 200 as described above with reference to FIGS. 3 to 6, the core node 340 for monitoring the core node 340 generates a streaming change message, In one embodiment, to the terminal 100.

When the streaming change message is received from the core node 340 in step S503, the terminal 100 can confirm the edge node 350 through the streaming change message in step S505. Message (S507).

Thereafter, the terminal 100 may receive the content from the edge node 350 in response thereto (S509). At this time, the terminal 100 can sequentially receive the content in a streaming manner, and can sequentially reproduce the received content.

The contents transmission control method according to the embodiment of the present invention has been described above.

Such a content transmission control method may be provided in the form of a computer-readable medium suitable for storing computer program instructions and data.

Such a computer-readable recording medium may include program instructions, data files, data structures, etc., singly or in combination, and includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include 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), and a digital video disk (ROM), random access memory (RAM), flash memory, and the like, such as a magneto-optical medium such as a magneto-optical medium and a floppy disk, And hardware devices that are specifically configured to perform the functions described herein.

In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers of the technical field to which the present invention belongs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated by those skilled in the art that numerous changes and modifications can be made to the invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

The present invention relates to a media transmission field in ICT technology. More particularly, the present invention provides a cell ID / base station IP information (e.g., a mobile descriptor) And the like.

According to the present invention, the cache apparatus configures information on the MMT contents cached by the cache apparatus in the form of a cache information message and transmits or shares the cache information to another cache apparatus, a cache controller, and a content server, It can be applied to a control system more easily and it is advantageous that the existing CDN service can be easily changed and applied based on MMT. Further, since the present invention is not limited to a commercial or an operation, it is industrially applicable because it is practically possible to carry out clearly.

100: terminal
200: Content server
340: core node
341:
342:
343:
350: edge node
351:
352:
353:

Claims (10)

A method of controlling content transmission in a core node that controls a plurality of edge nodes,
The core node comprising:
Receiving a content request message including a mobile descriptor from a terminal;
Identifying an edge node corresponding to base station information included in the mobile descriptor; And
Transmitting a streaming change message to the edge node or the terminal so that the edge node can transmit the content to the terminal;
The content transmission control method comprising: The method according to claim 1,
Before the step of receiving the content request message,
Receiving a coverage message from the edge node;
Confirming base station information in the coverage message; And
Matching and storing the identified base station information and the identification information of the edge node;
Further comprising the step of: 3. The method of claim 2,
The step of identifying the edge node
Identifying identification information of an edge node stored in the mobile node to match the base station information included in the mobile descriptor; And
Selecting an edge node caching content among the edge nodes identified;
The content transmission control method comprising: 3. The method of claim 2,
The coverage message
Cell identification information (cell_id), and IP address information. The method according to claim 1,
The mobile descriptor
And at least one of the terminal identification information, the IP address information, and the cell identification information (current_cell_id). The terminal,
Transmitting a content request message including a mobile dispenser to a core node in response to a content request from a user;
Transmitting the content request message to an edge node included in the streaming change message when a streaming change message is received from the core node in response to the content request message; And
Receiving and reproducing the content from the edge node;
The content transmission control method comprising: A computer-readable recording medium storing a program for executing the method according to any one of claims 1 to 6. A computer program stored in a computer-readable medium embodied thereon for carrying out the method recited in any one of claims 1 to 6. A core communication unit for performing communication with a terminal, a content server, and a plurality of edge nodes; And
When the content request message including the mobile descriptor is transmitted from the terminal through the core communication unit, the edge node corresponding to the base station information included in the mobile descriptor is checked, and the checked edge node can transmit the content to the terminal A core control unit for controlling the core communication unit to transmit a streaming change message to the edge node or the terminal through the core communication unit;
And a core node. 10. The method of claim 9,
The core control unit
The method comprising the steps of: receiving a coverage message from a plurality of edge nodes, identifying base station information in the coverage message, matching the identified base station information with identification information of the corresponding edge node, The content caching list, and the content caching list.

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