KR20180052195A - Method for distributing a content and apparatus thereof - Google Patents

Abstract

The present invention relates to a cache device which can provide MPEG media transport (MMT) content to a client device by substituting for a content server when the cache device caches the MMT content requested by the client device, and a method for transmitting MMT content in the cache device, thereby more easily applying the cache device and the method to a content transmission system operated based on MMT. To this end, the cache device comprises: a storage unit for storing MMT content divided by a media processing unit (MPU); and a control unit for controlling the MMT content stored in the storage unit to an MMT receiving entity after determining that MMT content requested by the MMT receiving entity is stored by inspecting, with the MPU, whether the MMT content requested by the MMT receiving entity is stored in the storage unit.

Description

METHOD FOR DISTRIBUTING A CONTENT AND APPARATUS THEREOF FIELD OF THE INVENTION [0001]

The present invention relates to a content transmission method, and more particularly, to a content transmission method in which, when a cache device is caching MMT content requested by a client device, the cache device is capable of providing MMT content to the client device And a method of transmitting MMT contents in the cache apparatus.

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, Some or all of the frequent contents are copied and stored in advance in a cache device distributed in a plurality of Internet service provider (ISP) point of presence (PoP), in particular, a cache device distributed and arranged near the user terminal, It means a service that allows the user terminal to access the corresponding cache device through the returned path and receive the content by returning the path of the cache device closest to the user.

The CDN service has a merit that the cache apparatus located nearest to the user provides the contents to the user terminal, thereby improving the response speed to the contents request of the user terminal and providing the contents more stably.

However, up to now, the CDN service is based on HTTP. Therefore, the cache device supporting the CDN service also operates based on HTTP, so that caching processing of MMT contents is impossible.

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

Disclosure of Invention Technical Problem [6] The present invention has been proposed to solve the above-described problems of the related art, and a message format is newly defined so that a cache device supporting a CDN service provides a caching service for MMT-based contents.

Accordingly, the content server of the present invention adds a message to the MMT content so that the cache device can cache the MMT content, and the cache device monitoring the MMT content caches the MMT content. In addition, A cache apparatus capable of providing MMT contents on behalf of a server, and a method of transmitting MMT contents in the cache apparatus.

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 an aspect of the present invention, there is provided a cache apparatus capable of monitoring information between an MMT transmitting entity to transmit MMT contents and an MMT receiving entity to receive MMT contents, The cache apparatus includes: a storage unit for storing MMT (MPEG Media Transport) contents divided into MPU (Media Processing Unit) units; And checking whether the MMT content requested by the MMT receiving entity is stored in the storage unit, and if it is determined that the MMT content is stored, And a control unit for controlling the transmission unit to be transmitted to the main body.

At this time, the controller may perform the inspection in units of MPU, and may determine that the MMT contents are stored when a predetermined number of consecutive hits occur.

Also, the controller may check the asset ID through the hash value of the MPU, and may determine that the MMT contents are stored when the MPU including the same asset ID exists more than the preset number of times.

In addition, when it is determined that the MMT contents are stored, the control unit controls the MMT contents stored in the storage unit to be transmitted to the MMT receiving entity, and blocks the transmission of the MMT contents transmitted from the MMT transmitting entity .

If the MMT content is not stored, the control unit checks a cache information message corresponding to the MMT content transmitted from the MMT transmission entity. If it is determined that the MMT content can be cached, May be stored in the storage unit.

In addition, the cache information message includes information on a caching policy for each MPU of the MMT contents, and the controller can check the caching policy for each MPU and copy only the cacheable MPU to be stored in the storage unit.

At this time, the cache information message may include an asset ID, a cacheable, an expire_time, and a maximum reference time Max_age.

In order to achieve the above object, there is provided an MMT capable of monitoring information between an MMT transmitting entity to transmit MMT contents and an MMT receiving entity to receive MMT contents, A method of transmitting a content, the method comprising the steps of: checking, by the MPU (Media Processing Unit), whether the cache apparatus stores MMT (MPEG Media Transport) contents requested by the MMT receiving entity; And controlling the stored MMT contents to be transmitted to the MMT receiving entity when it is determined that the MMT contents are stored.

If it is determined that the MMT content is not stored, it is checked whether a cache information message of the MMT content transmitted from the MMT transmitting entity is confirmed. If it is determined that the MMT content can be cached, And copying and storing the MMT contents.

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

According to an aspect of the present invention, there is provided a computer program stored on a computer readable recording medium, the MMT transmitting entity capable of transmitting MMT contents to an MMT receiving entity that receives MMT contents, Configuring a cache information message comprising an asset ID, a cacheable, an expiration time (expire_time), and a maximum reference time (Max_age).

According to the cache apparatus of the present invention and the method of transmitting MMT contents in the cache apparatus, the content server defines and adds a message so that the cache apparatus can cache the MMT contents when transmitting the MMT contents to the client apparatus, It is possible to cache the MMT contents, thereby making it easier to apply the MMT-based content transmission system.

If it is determined that the cache apparatus is caching MMT contents requested by the client apparatus in units of MPUs and it is determined that the MMT contents are cached, the MMT contents are sequentially streamed from the MPU next to the last transmitted MPU The MMT contents can be provided more quickly.

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 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 an exemplary diagram illustrating a content transmission path according to an embodiment of the present invention.
4 is a block diagram showing a main configuration of a cache apparatus according to an embodiment of the present invention.
5 to 8 are data flow charts for explaining a method of transmitting MMT contents 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 cache apparatus according to an embodiment of the present invention and a method of transmitting MMT contents in the cache apparatus 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 particular, the content of the present invention can be defined according to the MMT (MPEG Media Transport) protocol.

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

FIG. 1 is a system diagram illustrating a content transmission system according to an embodiment of the present invention. FIG. 2 is an exemplary view illustrating MMT contents according to an embodiment of the present invention. Referring to FIG. 3 is an exemplary diagram illustrating a content transmission path according to an embodiment of the present invention.

1, a content transmission system 1000 according to an embodiment of the present invention includes a network 300 including a client device 100, a plurality of cache devices 350 and a cache controller 340, (200).

First, the client device 100 requests specific content from the content server 200 through the network 300 according to a request from the user, and receives and uses the content provided from the content server 200. In particular, the client apparatus 100 of the present invention is a user apparatus capable of supporting the MMT (MPEG Media Transport) protocol, and is used by the content server 200 to transmit MPEG media transport streaming data (hereinafter referred to as 'MMT content' And receives and reproduces the MMT content transmitted by the content server 200. The MMT content server 200 receives the MMT content from the content server 200,

The client device 100 confirms the request of the specific MMT content from the user. A request for the specific MMT content may be made through a URL (Uniform Resource Locator) for a specific content or a user input for executing an application capable of reproducing the MMT content. Then, the client device 100 accesses a name server such as a DNS (Domain Name Server) to acquire an IP address of the content server 200 providing the corresponding MMT content. Then, the client device 100 requests and receives the MMT content from the corresponding content server 200.

The content server 200 provides various contents such as photographs, video, audio, applications, etc. to the client device 100. The content server 200 receives at least one content from a contents provider (CP) And provides the contents to the plurality of client devices 100 through the network 300. [ Particularly, the contents server 200 of the present invention can provide contents to the client device 100 in the form of MMT contents, and can interoperate with the MMT streaming server (not shown) And the MMT streaming server (not shown) converts the MMT content into the MMT content type and transmits the MMT content to the client device 100. [ In the following description, it is assumed that the content server 200 directly provides MMT content for convenience, but it should be noted that the MMT streaming server can operate in conjunction with a separate MMT streaming server (not shown) as described above.

In addition, the content server 200 of the present invention can transmit a cache information message in the MMT content so that the cache device 350, which passes the MMT content to the client device 100, can cache the MMT content . At this time, when the content server 200 of the present invention cooperates with an MMT streaming server (not shown), an MMT streaming server (not shown) can configure the message.

A plurality of cache devices 350 and a cache controller 340 distributed on the network 300 serve to control the content flow between the client device 100 and the content server 200. It is preferable that a plurality of cache devices 350 are located between the access network 330 and the core network 320 and the cache controller 340 is located between the core network 320 and the Internet network 310. However, A plurality of cache devices 350 and a cache controller 340 may be provided in various forms on the network 300 if the content flow between the client device 100 and the content server 200 can be controlled. .

The cache apparatus 350 stores a part or all of the content in advance according to a predetermined content distribution policy of the content served from the content server 200. Thereafter, when a request for the MMT content requested by the client device 100 transmitted from the content server 200 is detected, the cache device caching the MMT content included in the corresponding content response message among the plurality of cache devices 350, The MMT content can be transmitted to the client device 100 on behalf of the content server 200.

In particular, the cache apparatus 350 according to the embodiment of the present invention can store the MMT contents divided into units of a media processing unit (MPU) unit.

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).

It is assumed that the MMT contents of the present invention are applied and operated on the MPU basis. That is, the content server 200 can sequentially transmit the MMT content to the client device 100 on an MPU-based basis, and the client device 100 can receive and play back MMT content in units of MPUs received sequentially. However, the MMT content of the present invention is not necessarily limited to the MPU unit, and the processing of the present invention may be performed on a media fragment unit basis according to a system implementation method.

The cache apparatus 350 of the present invention may divide and store MMT contents in units of MPU as described above, and may store a part or all of the contents. The cache apparatus 250 monitors information transmitted and received between the client apparatus 100 and the content server 200. When the client apparatus 100 does not cache the MMT content requested by the client apparatus 100, The content server 200 may transmit the MMT content according to a request from the client device 100. [

However, when the MMT content requested by the client device 100 is cached by the client device 100, the cache device 350 of the present invention may transmit the MMT content cached by the client device 100, instead of the content server 200, To the client device (100).

In addition, since the cache apparatus 350 of the present invention does not cache the MMT contents requested by the client apparatus 100, the content server 200 transmits the MMT contents at the request of the client apparatus 100 The cache device 350 checks the cache information message included in the MMT content and can copy and cache the MMT content if the MMT content can be cached. At this time, the client apparatus 100 of the present invention can cache the MMT contents delivered by MPU unit by MPU unit.

The operation of the cache apparatus 350 will be described later in detail. The content providing system 1000 of the present invention manages a plurality of cache apparatuses 350 distributed on the network 300, And a cache controller 340 for controlling a content delivery process by the content provider 350. The cache controller 340 of the present invention is located between the cache apparatus 350 and the content server 200 and can control the flow of MMT contents.

The network 300 in which a plurality of cache devices 350 of the present invention are dispersed and arranged at main points means a communication network for transmitting and receiving information between the client device 100 and the content server 200, A communication network implemented using various types of wired / wireless communication technologies such as an intranet network, a mobile communication network, and a satellite communication network may be mixed rather than a single communication network type.

The network 300 may include an external network, such as the Internet network 310, connected to a mobile network including a plurality of wired and wireless access networks 330 and a core network 320. The wired / wireless access network 330 constituting the mobile network is an access network that performs wired / wireless communication with the client device 100 and includes a plurality of base stations such as a base station (BS), a base transceiver station (BTS) And a base station controller such as 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).

The core network 320 configuring the mobile network together with the wire / wireless access network 330 plays a role of connecting the wired and / or wireless access network 330 with 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 client device 100 via the core network 320 and the wire / wireless access network 330, or may be provided to the plurality of cache devices 350 according to a predetermined distribution policy.

The network 300 of the present invention has been briefly described, and the network 300 is coupled with the cache device 350 to store computing resources such as hardware and software, And a cloud computing network that can be provided to the terminal. 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. The network 300 may be a closed network such as a LAN (Local Area Network) or a WAN (Wide Area Network), an open network such as the Internet, a CDMA (Code Division Multiple Access), a WCDMA (LTE) and Evolved Packet Core (EPC), as well as next-generation networks and cloud computing networks to be implemented in the future.

Hereinafter, a main configuration and an operation method of the cache apparatus 350 according to an embodiment of the present invention will be described with reference to FIG.

4 is a block diagram showing a main configuration of a cache apparatus according to an embodiment of the present invention.

1 and 4, a cache apparatus 350 according to an embodiment of the present invention may include a communication unit 351, a control unit 352, and a storage unit 353.

First, the communication unit 351 monitors various data transmitted and received through the core network 320 or the Internet network 310, and transmits / receives data. In particular, the communication unit 351 of the present invention can monitor and detect information transmitted / received between the client device 100 and the content server 200. For this purpose, the communication unit 351 includes a mirroring module and an injection Modules. The mirroring module copies data transferred through the core network 320 or the Internet network 310 and transfers the copied data to the controller 352. The injection module transmits the data received from the control unit 352 to the cache controller 340 or the client device 100 via the core network 320 or the Internet network 310. [ Accordingly, the communication unit 351 confirms a content request transmitted from the client apparatus 100 to the content server 200 through the connection with the client apparatus 100, or transmits the content request to the content server 200 via the client apparatus 100 MMT contents can be confirmed.

The control unit 352 controls the overall operation of the cache apparatus 350. The control unit 350 of the present invention includes a caching determination module 352a and a caching control module 352b.

First, the caching determination module 352a checks the MMT content that the client device 100 transmits to the content server 200 or the MMT content that the content server 200 delivers to the client device 100, And can determine whether the MMT contents are cached by the user.

At this time, the caching determination module 352a of the present invention determines whether or not a cache hit occurs in units of MPUs. When a continuous hit occurs for a predetermined number of times or more, the caching determination module 352a directs the caching determination module 352a to the caching control module 352b in order to transmit the MMT contents to the client device 100 on behalf of the content server 200 .

If it is determined that the MMT content delivered from the content server 200 to the client device 100 is not being cached, the caching determination module 352a checks the cache information message included in the MMT content, Can be cached.

The cache information (CAI) message included in the MMT contents of the present invention can be configured as shown in Table 1 below.

Syntax V alues No . of bits Mnemonic CAI_message () {
      message_id
version
length

message_payload {
asset _ id () {
asset _ id _ scheme
asset _ id _ length
for (j = 0; j <N; j ++) {
asset _ id _ byte
}
}
cacheable
expires
max_age

            }
}






N




16
8
16



32
8



One
64
64

uimsbf
uimsbf
uimsbf



uimsbf
uimsbf



bslbf
uimsbf
uimsbf

The asset_ID of the message means an asset ID for identifying an asset.

Cacheable means a 1-bit flag indicating a cacheable policy. At this time, if the flag is set, the corresponding MMT content can not be cached.

expire_time means the expire time of the cached MMT contents and can be composed of 64 bits. Accordingly, the control unit 352 of the cache apparatus 350 can determine the storage period of the corresponding MMT content.

For example, assuming that the maximum reference time Max_age is 1200 seconds, Max_age indicates the maximum MM_Time of the MMT content to be cached up to 1200 seconds, May be transmitted to the MMT receiving entity on behalf of the MMT transmitting entity. After 1200 seconds have elapsed, the MMT transmitting entity must inquire the validity check of the corresponding MMT content, such as the content server 200, The MMT content can be delivered to the MMT receiving entity on behalf of the content server 200. [

In addition, the cache information message may further include information of the content server 200, for example, a host name field.

In addition, the cache information message of the present invention may be transmitted through an MMT signaling message separate from the MMT content, and may be included in the MMT content.

The caching control module 352b interrupts the communication between the client device 100 and the content server 200 when it is determined that the MMT content is cached by the caching determination module 352a, The MMT contents stored in the MMT server 353 may be transmitted to the client device 100 through the communication unit 351. [

That is, if the caching control module 352b of the present invention determines that the MMT content is cached by the content server 200 in the state where the MMT content is received, the MMT content is transmitted to the client device 100 And may transmit the MMT contents to the client device 100 on behalf of the content server 200. [ At this time, since the caching control module 352b of the present invention is in a state of caching the MMT contents in units of MPU, the caching control module 352b checks the MPU identification information of the MMT contents delivered last, and sequentially updates the MPUs corresponding to the next MPU identification information To be transmitted to the client device (100).

The caching control module 352b of the present invention may store the entire MMT contents or the entire MMT package of the MMT contents in the storage unit 353, The MMT contents may be directly transmitted to the client device 100 as the content transmission request is confirmed.

When the MMT content is not being cached from the content server 200 to the client device 100, the caching control module 352b of the present invention uses the cache information message included in the MMT content, And can support the caching process.

In addition, when the caching control module 352b of the present invention intends to transmit the MMT content cached therein to the client device 100, the caching control module 352b may transmit the caching information message including the caching information message to the MMT content.

That is, the caching information message indicating whether or not the caching of the MMT content according to the present invention is cached may correspond to the MMT content when the MMT transmitting entity to transmit the MMT content transmits the MMT content to the MMT receiving entity, Which may be transmitted, included in the MMT content, or transmitted via a separate MMT signaling message corresponding to the MMT content.

The MMT contents 353a stored in the storage unit 353 can be divided and stored in units of MPUs, and can store and manage caching information messages.

The 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. In particular, the storage unit 353 according to the embodiment of the present invention may store the MMT contents 353a, and the MMT contents 353a may be stored in units of MPUs.

The 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 cache device 350. [ The data area is an area in which data generated according to use of the cache device 350 is stored. Various instructions for processing the MMT contents 353a may be stored as described above. The 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, a ROM ROM), and the like.

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

Hereinafter, a content transmission method according to an embodiment of the present invention will be described with reference to FIGS. 5 to 8. FIG.

5 to 8 are data flow charts for explaining a method of transmitting MMT contents according to an embodiment of the present invention.

First, in order to transmit content in the cache apparatus 350 of the present invention, the cache apparatus 350 must store MMT contents in advance.

Referring to FIG. 5, the client device 100 may request MMT content from the content server 200 in a state of being connected to the content server 200 (S101). The content server 200 receives the MMT content and transmits the MMT content to the client device 100 (S105).

The MMT content transmitted from the content server 200 to the client device 100 may be streamed in units of MPUs. That is, the content server 200 of the present invention can sequentially transmit MMT contents to the terminal 100 according to the MPU identification information such as MPU1, MPU2, MPU3,.

The cache apparatus 350 monitoring this process (S107) checks whether the MMT content delivered from the content server 200 to the client apparatus 100 is cached, and if the MMT content is not being cached, In order to cache the MMT contents, the cache information message can be confirmed (S109). If the MMT content can be cached according to a cache policy of the cache information message (S111), the MMT content is cached (S113), and if not The content can be terminated without caching. At this time, the cache apparatus 350 of the present invention can control the process of dividing the MMT contents into MPU units and storing them.

In addition, the cache information message of the present invention may include information on a cache policy for each MPU of MMT contents. Accordingly, the cache apparatus 350 of the present invention can control a more detailed caching process in units of MPUs. For example, if the MPU1 and MPU2 are set to 'allow caching', the MPU1 and MPU2 are cached, and if the MPU3 is set to 'non-cacheable', the process of S111 may be performed by checking a caching information message for each MPU. The MPU 3 can be controlled not to cache. Accordingly, when a partial scene of the MMT content is to be provided only to a paid subscriber, the cache apparatus 350 of the present invention can cache only the MMT contents that can be provided to all users without caching the scene.

When the MMT contents are cached in this way, the cache apparatus 350 of the present invention can provide the MMT contents to the client apparatus 100 on behalf of the contents server 200.

Referring to FIG. 6, the client apparatus 100 of the present invention may request transmission of specific MMT contents to the content server 200 while being connected to the content server 200 (S201) S203).

The content server 200 of the present invention can stream corresponding MMT contents to the client device 100 in units of MPUs (S205), and the cache device 350 monitoring the MMT contents can transmit the MMT contents to the MMT It is determined whether or not the content is hit (S207 to S209).

At this time, the cache apparatus 350 of the present invention can confirm the asset identification information in MPU units. That is, since the MPU for the same asset has the same asset identification information, the cache apparatus 350 of the present invention stores the MPU corresponding to the same asset identification information as the MMT contents delivered to the client apparatus 100 in the storage unit The cache apparatus 350 of the present invention can directly detect the MMT contents in the client apparatus 100 by using the cache apparatus 350 of the present invention. The transmission of the MMT content from the content server 200 to the client device 100 is blocked (S215).

The cache apparatus 350 of the present invention may transmit the MMT contents cached to the client apparatus 100 sequentially from the MPU corresponding to the MMT contents finally delivered to the client apparatus 100 in step S205 (S217) .

Meanwhile, when the contents transmission system of the present invention includes the cache controller 340, the cache apparatus 350 may transmit the MMT contents under the control of the cache controller 340.

At this time, the cache controller 340 of the present invention can store and manage the cache list cached by the plurality of cache devices 350 in advance, and thereby can determine and determine the optimum cache device for providing the content. In addition, the cache list may include identification information of the MPU for the MMT contents, and the cache controller 340 may determine the cache hit process using the identification information of the MPU.

7, the first cache apparatus 350A and the second cache apparatus 350B caching the MMT contents periodically transmit a cache list of the MMT contents held by the cache controller 340 ). The cache list may include MPU identification information on the MMT contents held.

The cache controller 340 can store and manage the cache list in accordance with the identification information of the cache apparatus 350. The client apparatus 100 can then access the MMT server 200 in a state of being connected to the content server 200 200 in step S405, and the content server 200 may stream the MMT content to the client device 100 and transmit the MMT content in step S407.

The cache controller 340 which is located between the client device 100 and the content server 200 and monitors the information transmitted and received between the client device 100 and the content server 200 in operation S409, And the cache list includes the MPU identification information. Therefore, the cache list is compared with the identification information of the MPU of the MMT content delivered from the content server 200 to the client device 100, (S419).

If a continuous hit occurs more than a predetermined number of times (S415), the cache controller 340 blocks the MMT content from being transferred from the content server 200 to the client device 100 (S417) The first cache device 350A may request the content transmission to the client device 100 on behalf of the content server 200. The first cache device 350A may request the content transmission to the first cache device 350A, .

The cache apparatus 350 may cache the MMT contents when the MMT contents are not being cached from the content server 200. However, if the MMT contents are transmitted from another cache apparatus 350, And caching the MMT contents if they are not being cached.

8, when the client device 100 requests the MMT content from the content server 200 in step S501 and the MMT content is being delivered from the content server 200 to the terminal 100, The second cache apparatus 350B can monitor the process (S505), and determines whether or not the corresponding MMT content is cached. As a result of the determination, when the second cache apparatus 350B is confirmed to be in a cache hit state (S509), the first cache apparatus 350B replaces the content server 200 in order to provide MMT contents to the client apparatus 100 The content transmitted from the content server 200 is blocked (S511), and the MMT contents stored therein can be sequentially transmitted to the client device 100 in units of MPU (S513).

At this time, the first cache device 350A located between the client device 100 and the second cache device 350B and capable of monitoring (S515) the client device 100 and the second cache device 350B The cache information message of the MMT content delivered from the first cache device 350B is checked (S519), and the cache policy included in the cache information message is checked. If the cache policy is set to be cacheable (S521), the content can be cached (S523).

The cache information message confirmed in step S519 may be a cache information message transmitted by the origin server. The cache information message may be a cache information message newly set by the second cache device 350B, which is the MMT transmitting entity in FIG. 8, Message.

As described above, according to the present invention, when an MMT entity that transmits MMT contents transmits MMT contents to an MMT receiving entity that wants to receive MMT contents, a cache information message indicating a cache policy corresponding to the MMT contents So that the cache apparatus 350 located in the path can cache the corresponding MMT contents.

In addition, the present invention can determine whether content is cached on an MPU-by-MPU basis, so that a more detailed caching policy for MMT content can be established and managed.

In addition, when there is a transmission flow of MMT contents transmitted from the content server 200 to the client device 100, the present invention determines whether an entity located in the path is a cache hit in units of MPUs. If the entity is in a cached state, It is possible to transmit the content to the client device 100 immediately after the MPU, and thus the content can be transmitted more quickly.

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

The method of providing a speech recognition service of the present invention as described above may be provided in the form of a computer-readable medium suitable for storing computer program instructions and data.

In particular, the computer program of the present invention is a method for transmitting MMT contents in a cache apparatus capable of monitoring information between an MMT transmitting entity to transmit MMT contents and an MMT receiving entity to receive MMT contents Wherein the cache device checks whether the MMT content is stored in a unit of an MPU (Media Processing Unit) whether the MMT content is stored in the MMT receiving entity, and if it is determined that the MMT content is stored, Controlling the MMT content to be transmitted to the MMT receiving entity, or if it is determined that the MMT content is not stored, checking the cache information message of the MMT content transmitted from the MMT transmitting entity and determining that the MMT content is cacheable A step of copying and storing the MMT contents delivered from the MMT transmission entity, and the like .

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 true spirit and scope of the present invention are intended to be embraced therein.

The present invention relates to a content transmission method, and more particularly, to a content transmission method in which, when a cache device is caching MMT content requested by a client device, the cache device is capable of providing MMT content to the client device And a method of transmitting MMT contents in the cache apparatus.

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, System can be applied more easily, and it is easy to change and apply the existing CDN service based on the 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: client device 200: content server 300: network
310: Internet network 320: Core network 330: Access network
340: cache controller 350: cache device 351:
352: Control section 353:
1000: Content transmission system

Claims (11)

A cache apparatus capable of monitoring information between an MMT transmitting entity to transmit MMT contents and an MMT receiving entity to receive MMT contents,
The cache device
A storage unit for storing MMT (MPEG Media Transport) contents divided into MPU (Media Processing Unit) units; And
Checking whether the MMT content requested by the MMT receiving entity is stored in the storage unit, and if it is determined that the MMT content is stored, transmitting the MMT content stored in the storing unit to the MMT receiving entity To be transmitted to the mobile terminal;
And a cache memory. The method according to claim 1,
The control unit
Wherein the MMT judging unit judges that the MMT contents are stored when a predetermined number of consecutive hits are generated by performing the checking in units of the MPU. 3. The method of claim 2,
The control unit
And determines that the MMT content is stored if the MPU including the same asset ID exists more than the predetermined number of times. The method according to claim 1,
The control unit
And controls transmission of the MMT content stored in the storage unit to the MMT receiving entity when the MMT content is stored, and blocks transmission of the MMT content transmitted from the MMT transmitting entity Cache device. The method according to claim 1,
The control unit
When the MMT content is not stored, the cache information message corresponding to the MMT content transmitted from the MMT transmitting entity is checked, and if it is determined that the MMT content can be cached, the MMT transmitting entity transmits, to the MMT receiving entity, And the content is copied and stored in the storage unit. 6. The method of claim 5,
The cache information message
Wherein the control unit includes information on a caching policy for each MPU of the MMT contents, and the control unit checks the caching policy for each MPU and copies only the cacheable MPU and controls the cache unit to be stored in the storage unit. 6. The method of claim 5,
The cache information message
An asset ID, a cacheable, an expire time, and a maximum reference time Max_age. A method for transmitting MMT contents in a cache apparatus capable of monitoring information between an MMT transmitting entity to transmit MMT contents and an MMT receiving entity to receive MMT contents,
The cache apparatus comprising:
Checking whether the MMT receiving entity stores MMT (MPEG Media Transport) contents requested by the MPT (Media Processing Unit) unit; And
Controlling to transmit the stored MMT contents to the MMT receiving entity when it is determined that the MMT contents are stored;
And transmitting the MMT content. 9. The method of claim 8,
If it is determined that the MMT content is not stored, the cache information message of the MMT content transmitted from the MMT transmitting entity is checked. If it is determined that the MMT content can be cached, the MMT transmitting entity transmits the MMT content And copying and storing the data;
And transmitting the MMT content to the MMT server. A computer-readable recording medium storing a program for executing the method according to any one of claims 8 and 9. An MMT transmitting entity capable of transmitting MMT contents to an MMT receiving entity to receive MMT contents
Configuring a cache information message including an asset ID, a cacheable, an expire time, and a maximum reference time Max_age for the MMT content;
Readable recording medium. ≪ RTI ID = 0.0 > A < / RTI >

Images