KR20160144812A - Method for caching processing of mmt packet and apparatus for the same, mthod for generating of mmt packet and apparatus for the same - Google Patents

Abstract

The present invention relates to MPEG media transport (MMT), and more specifically, to a method for processing caching of an MMT packet and an apparatus therefor, and a method for generating the MMT packet for processing the caching and an apparatus therefor, capable of configuring the MMT packet by inserting a caching parameter using an extended header of a payload header of the MMT packet by a content providing server, such that a cache apparatus is able to cache and process the MMT packet. To this end, according to one embodiment of the present invention, the method for processing the caching of the MMT packet, in which the method is performed by the cache apparatus, includes the steps of: checking whether a caching parameter is inserted into an extended header of a payload header of the MMT packet when the cache apparatus receives the MMT packet transmitted from a content providing server to a terminal; and caching the MMT packet according to the caching parameter when the caching parameter is inserted into the extended header in the checking step.

Description

[0001] The present invention relates to an MMT packet caching method and apparatus therefor, a method for generating an MMT packet for caching processing, and a device for the MMT packet caching processing method.

The present invention relates to an MMT (MPEG Media Transport), and more particularly, a content providing server inserts a caching parameter using an extension header of a payload header of an MMT packet so that a cache apparatus can cache and process an MMT packet An MMT packet caching method and apparatus for configuring an MMT packet, an MMT packet generation method for caching processing, and an apparatus therefor.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

2. Description of the Related Art [0002] Recently, according to the improvement of performance of a terminal such as a smart phone and development of a mobile communication technology, a user can access a web server provided by a contents provider (CP) , 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 transferring various kinds of contents such as photographs, movies, music videos, etc. to the terminal stably. The CDN service is a service which is concentrated on a web server of a content provider remote from the terminal, Is partially or entirely copied and stored in advance in a cache device distributed in a plurality of ISP (Internet Service Provider) Point-of-Presence (PoP), in particular, in a cache device distributed and arranged near the terminal, The path is returned to the cache device located closest to the user to allow the terminal to access the corresponding cache device through the returned path and receive the content.

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

MPEG-2 TS (Transport System) has been used for media transmission in various industrial fields such as terrestrial and satellite digital broadcasting, DMB, and IPTV since standardization. In recent years, media storage in digital video cameras and Blu- And its use is expanding. However, the recent network environment is rapidly changing, and new requirements such as multimedia transmission technology in various heterogeneous network environments are required. Accordingly, a new technology standard for providing various contents and services in various sophisticated network environments has been demanded, and thus MMT (MPEG Media Transport) technology is being developed.

However, until now, the MMT packet does not define the protocol for performing the caching function like the CDN service. Therefore, a cache apparatus that provides a general CDN service can not cache the MMT packet transmitted to the terminal.

Therefore, it is necessary to develop a technique for configuring an MMT packet so that the caching process can be performed in the MMT packet and processing the cache device so that it can be cached.

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 [8] The present invention has been proposed in order to solve the above-mentioned conventional problems. In order to cache and process an MMT packet, a content providing server inserts a caching parameter in an extension header of a payload header of an MMT packet, A MMT packet caching method and apparatus for the MMT packet caching, a MMT packet generation method for caching processing, and an apparatus therefor.

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 processing an MMT packet caching according to an embodiment of the present invention, the method comprising the steps of: Confirming whether a caching parameter is inserted in an extension header of a payload header of the MMT packet when an MMT packet transmitted from the server to the terminal is received; And caching the MMT packet according to the caching parameter when the caching parameter is inserted in the extension header in the checking step.

Receiving a specific MMT packet request from any other terminal after the caching; Determining whether the other terminal is caching the MMT packet requested by the other terminal; And transmitting the cached MMT packet to the another terminal when the MMT packet is cached.

In this case, if the caching parameter is not inserted, bypassing the MMT packet may be performed.

At this time, the checking step can check whether a caching parameter is inserted in the extension header value of the extension header.

According to another aspect of the present invention, there is provided a method of generating an MMT packet for caching by a content providing server, the method comprising the steps of: Constructing an MMT packet comprising a packet header, a payload header and payload data; And transmitting the configured MMT packet to a terminal via a cache device, wherein the extension header of the payload header may include a caching parameter for caching.

At this time, the caching parameter may include at least one of a cache control value, a cache state, and a cache validity period.

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 another aspect of the present invention, there is provided an apparatus for processing an MMT packet caching according to an embodiment of the present invention. The apparatus includes: A cache communication unit for monitoring the delivered MMT packet and transmitting the monitored MMT packet to the cache control unit; A cache control unit for controlling the cache memory unit to cache the MMT packet according to the caching parameter when the MMT packet is transmitted through the cache communication unit and a caching parameter is inserted in an extension header of the payload header of the MMT packet, ; And a cache storage unit for caching the MMT packet under the control of the cache control unit.

According to another aspect of the present invention, there is provided an apparatus for generating an MPEG Transport Protocol (MMT) packet for caching processing, the apparatus comprising: A server control unit configuring an MMT packet including a load header and payload data; And a server communication unit for transmitting the configured MMT packet to a terminal via a cache apparatus; The server control unit may configure the MMT packet so that a caching parameter is included in an extension header of the payload header.

According to the MMT packet caching method and apparatus, the MMT packet generation method for caching processing, and the apparatus for the MMT packet caching processing method of the present invention, the cache device providing the CDN service caches the corresponding MMT packet according to the caching parameters defined in the MMT packet And provides the MMT packet to the terminal. Thus, the MMT packet can be provided more rapidly.

In addition, the content providing server of the present invention inserts a caching parameter for caching into an extension header of an MMT payload header to construct an MMT packet so that MMT packets can be more easily cached in the cache device without changing the design of the MMT packet .

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 block diagram schematically illustrating a main configuration of an MMT caching system of the present invention.
FIG. 2 is a block diagram illustrating a main configuration of a terminal according to an embodiment of the present invention shown in FIG. 1. Referring to FIG.
3 is a block diagram illustrating a main configuration of a cache apparatus according to an embodiment of the present invention shown in FIG.
4 is a block diagram illustrating a main configuration of a content providing server according to an embodiment of the present invention shown in FIG.
5 and 6 are data flow charts for explaining a method of processing MMT packet caching according to an embodiment of the present invention.
7 is a flowchart illustrating a method of generating an MMT packet according to an embodiment of the present invention.
8 to 10 are diagrams for explaining an MMT packet structure according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the nature and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

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

The terms and words used in the following description and drawings are not to be construed in an ordinary sense or a dictionary, and the inventor can properly define his or her invention as a concept of a term to be described in the best way It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

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.

In addition, embodiments within the scope of the present invention include computer readable media having or carrying computer executable instructions or data structures stored in computer readable media. Such computer-readable media can be any available media that is accessible by a general purpose or special purpose computer system. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or in the form of computer- But is not limited to, a physical storage medium such as any other medium that can be used to store or communicate certain program code means of the general purpose or special purpose computer system, .

In the following description and claims, "network" or "communication network" is defined as one or more data links that allow electronic data to be transmitted between computer systems and / or modules. When the information is transmitted or provided to a computer system via a network or other (wired, wireless, or a combination of wired or wireless) communication connection, the connection may be understood as a computer-readable medium. Computer readable instructions include, for example, instructions and data that cause a general purpose computer system or special purpose computer system to perform a particular function or group of functions. The computer executable instructions may be binary, intermediate format instructions, such as, for example, assembly language, or even source code.

In addition, the invention may be practiced with other computer systems, including personal computers, laptop computers, handheld devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, network PCs, minicomputers, mainframe computers, a pager, and the like. < RTI ID = 0.0 > [0040] < / RTI >

The invention may also be practiced in distributed systems environments where both local and remote computer systems linked by a combination of wired data links, wireless data links, or wired and wireless data links over a network perform tasks. In a distributed system environment, program modules may be located in local and remote memory storage devices.

Before describing the embodiments of the present invention, it is assumed that the technical background of the present invention is an MPEG MMT (MPEG Media Transport) technology. However, this is only an example for convenience of explanation, and the present invention is not necessarily applied to the MMT technology.

Hereinafter, the meaning of the terms described in this specification can be defined as follows.

A content component or a media component is defined as a media of a single type or a subset of media of a single type, A video track, movie subtitles, or an enhancement layer of video.

Content is defined as a set of content components, and may be, for example, a movie, a song, or the like.

Hybrid delivery defines that one or more content components are simultaneously transmitted through one or more physically different types of networks.

A presentation is defined as an operation performed by one or more devices so that a user can experience one content component or one service (e.g., enjoying a movie).

A service is defined as one or more content components transmitted for presentation or storage.

Service information is defined as metadata describing one service, characteristics and components of the service.

Non-timed data defines all data elements that are consumed without specifying the time. Timed data is data that does not have its own synchronization information for decoding and / or presentation of its media unit.

Timed data defines data elements associated with a particular time to be decoded and presented as thinning data for inherent synchronization information for decoding and / or presentation of its media unit.

A Media Fragment Unit (MFU) is a general container independent of any particular codec and accommodates encoded media data that can be consumed independently by the media decoder. The access unit AU includes one file for independently decodable media data or non-timed media data by a media decoder, such as all or a portion of an access unit (AU) for timed media data. It has a size smaller than or equal to the access unit (AU) and accepts information that can be used in the transport layer.

An MMT entity is an implementation of software or hardware that conforms to an MMT profile.

An MMT packet is a formatted unit of data generated or consumed according to the MMT protocol.

The MMT payload is a formatted unit of data carrying a package or signaling messages using the MMT protocol or the Internet application layer transport protocol (e.g., RTP (Real-Time Transport Protocol)).

The MMT protocol is an application layer transport protocol for delivering MMT payloads over an IP network.

The MMT payload format is a format for the payload of the MMT package or MMT signaling message to be delivered by the MMT protocol or the Internet application layer protocol (e.g., RTP).

Hereinafter, a main structure of a system according to an embodiment of the present invention will be described first.

1 is a block diagram schematically illustrating a main configuration of an MMT caching system of the present invention.

Referring to FIG. 1, the MMT caching system 1000 of the present invention may include a terminal 100, a network 300 including a plurality of cache devices 400, and a content providing server 200 .

First, the terminal 100 may request specific content from the content providing server 200 through the network 300 according to a request from the user, and may receive and use the content provided from the content providing server 200.

More specifically, the terminal 100 confirms a request for a specific content from a user. The request for the specific content may be input from a user such as a URL (Uniform Resource Locator) requesting specific contents through a browser or the like. Then, the terminal 100 accesses a name server such as a DNS (Domain Name Server) to acquire the IP address of the content providing server 200 providing the corresponding content. Then, the terminal 100 receives the content from the corresponding content providing server 200. In particular, the terminal 100 of the present invention can request content in the form of an MPEG media transport, that is, an MMT packet, and can receive and reproduce contents in the form of an MMT packet. In addition, the MMT packets are sequentially received in a streaming form, and the AT 100 can reproduce and process the MMT packets sequentially received in the streaming form.

The content providing server 200 provides various contents such as photographs, video, audio, applications, etc. to the terminal 100 and receives at least one content from a contents provider (CP) And provides the contents to a plurality of terminals 100 through the network 300. In particular, the content providing server 200 of the present invention can form an MMT packet and transmits an MMT packet to the AT 100 at the request of the AT 100.

A plurality of cache devices 400 distributed on the network 300 controls content flow between the terminal 100 and the content providing server 200. A plurality of cache devices 400 may be located between the access network 330 and the core network 320. However, the present invention is not limited to this, and a content flow between the terminal 100 and the content providing server 200 If so, they can be distributed on the network 300 in various forms.

The cache apparatus 400 stores a part or all of the content in advance according to a predetermined content distribution policy of the content served from the content providing server 200. Thereafter, when a content response message (for example, HTTP RESPONSE message) for a content request message (for example, an HTTP GET message) requested by the terminal transmitted from the content providing server 200 is detected, The cache device caching the content included in the content providing server 200 transmits the content to the terminal 100 on behalf of the content providing server 200.

Particularly, the cache apparatus 400 according to the embodiment of the present invention can perform caching processing for a plurality of MMT packets constituting a specific content. In a state where a part or all of the MMT packets are stored, the content providing server 200 ), It is possible to transmit the MMT packet to the terminal 100.

Particularly, the cache apparatus 400 according to the embodiment of the present invention determines whether or not the MMT packet requested by the terminal 100 is to be cached. If the cache hit state is the caching cache state, The MMT server 200 can support the process of caching the MMT packet transmitted from the content providing server 200 to the terminal 100 when the MMT packet is not being cached.

In addition, although not shown in the drawing, the network 300 of the present invention controls the management of a plurality of cache devices 400 distributed on the network 300 and the content delivery process by the plurality of cache devices 400 And a cache controller (not shown).

The main configuration and operation method of the cache apparatus 400 and the content providing server 200 will be described in more detail below. Processors to be installed in the terminal 100 and the content providing server 200 according to the embodiment of the present invention, And process program instructions for executing the method according to the invention. In one implementation, the processor may be a single-threaded processor, and in other embodiments, the processor may be a multithreaded processor. Further, the processor is capable of processing instructions stored on a memory or storage device.

The network 300 in which a plurality of cache devices 400 according to the present invention are distributed at key points means a communication network for transmitting and receiving information between the terminal 100 and the content providing 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 terminal 100 and includes a plurality of access networks 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).

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 providing server 200 and is provided from the content providing 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 a plurality of cache devices 400 according to a predetermined distribution policy.

In addition, the mobile packet transmitted and received on the mobile network may be transmitted through a GTP (GPRS Tunneling Protocol) tunnel unlike the Internet network 310. For example, when the terminal 100 transmits a content request message requesting content provided by the content providing server 200, the source address information of the terminal 100 (the IP address of the terminal 100) (ENodeB) of the access network 330 transmits an IP packet including address information (IP information of the contents providing server 200) to the access network 330, the GTP header, the UDP header, the GTP Converts the IP header for tunneling into a mobile packet to which the IP header is added, and transmits the mobile packet to the core network 320. At this time, the GTP header may include tunneling end point ID (TEID) assigned to the AT 100. [ The core network 320 may remove the GTP header, the UDP header, and the IP header for GTP tunneling, and may transmit the original IP packet transmitted by the terminal 100 to the content providing server 200 through the Internet network 310 have.

The network 300 of the present invention has been briefly described, and the network 300 is coupled with the cache device 400 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, the main configuration and operation method of the terminal 100 according to the embodiment of the present invention will be described.

FIG. 2 is a block diagram illustrating a main configuration of a terminal according to an embodiment of the present invention shown in FIG. 1. Referring to FIG.

1 and 2, a terminal 100 according to an embodiment of the present invention includes a communication unit 110, an input unit 120, a control unit 130, a storage unit 140, and an output unit 150 Lt; / RTI >

First, the communication unit 110 can support a process of connecting to the neighboring access network 330 for accessing the core network 320. [ For example, the communication unit 110 searches for a base station (not shown) located within a certain radius, requests a connection of the discovered base station (not shown), and supports connection to a base station Can be connected. Here, the process of connecting the communication unit 110 of the terminal 100 to the base station (not shown) of the access network 330 may employ various known configurations, and thus a detailed description thereof will be omitted. In addition, the communication unit 110 may transmit user information when performing a communication procedure with a base station (not shown). (Not shown) such as an International Mobile Subscriber Identity (IMSI) can be transmitted to a base station (not shown). While a base station (not shown) performs a connection procedure with the core network 320, So that the subscriber information can be confirmed.

In addition, when the communication unit 110 according to the embodiment of the present invention accesses the core network 320 normally through a base station (not shown) of the access network 330, the communication unit 110 transmits the content providing server 200 through the Internet network 310, And transmits the MMT packet to the control unit 130. The control unit 130 transmits the MMT packet to the control unit 130. [

The input unit 120 transmits various information such as numbers and character information input from the user, various functions, and signals inputted in relation to the function control of the terminal 100, to the control unit 130. In particular, the input unit 120 of the present invention can support user input of an MMT packet transmission request. For example, it is possible to support execution input of an application capable of reproducing an MMT packet from a user, and to support input of selection command information for a specific channel through an application.

As described above, the input unit 120 may include a key input unit such as a keyboard or a keypad, a touch input unit such as a touch sensor or a touch pad, a voice input unit, a gyro sensor, a geomagnetism sensor, an acceleration sensor and a proximity sensor, And gesture input means including at least one or more gesture input means.

In addition, it can include all forms of input that are currently under development or can be developed in the future.

The control unit 130 performs overall control of the terminal 100 and includes at least one processor including a CPU (Central Processing Unit) and an execution memory (e.g., a register and a register) in which at least one memory loading data is loaded. A random access memory (RAM), and a bus (BUS) for inputting / outputting at least one or more data to / from the processor and the memory. And may include predetermined program routines or program data loaded into the execution memory from a predetermined recording medium to perform a function defined in the terminal 100 in software and processed by the processor . In other words, in order to process the process of requesting and receiving MMT packets to the contents providing server 200 according to the embodiment of the present invention, a component that can be processed by software among the functions provided in the AT 100, 130).

The controller 130 of the present invention is functionally connected to at least one component provided for MMT packet request and playback according to an embodiment of the present invention. That is, the control unit 130 is functionally connected to the communication unit 110, the input unit 120, the storage unit 140, and the output unit 150, and controls the flow of signals for supplying power and performing functions to the respective components Respectively.

In particular, the controller 130 according to the embodiment of the present invention may support an MPEG-2 TS processing function capable of processing MPEG media transport streaming data. For example, it is possible to receive an MMT packet composed of a plurality of media processing units (MPUs) transmitted from the content providing server 200. When the MMT packet is composed of a plurality of assets, And reproducing and outputting the data.

The storage unit 140 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 140 according to the embodiment of the present invention may store various commands for requesting and playing MMT packets according to the embodiment of the present invention.

The storage unit 140 may include a program area and a data area. The program area stores relevant information for driving the terminal 100, such as an operating system (OS) for booting the terminal 100. [ The data area is an area in which data generated according to use of the terminal 100 is stored, and various commands for streaming data processing can be stored as described above. The storage unit 140 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 output unit 150 displays information on a series of operation states, operation results, and the like that occur during the performance of the function of the terminal 100. In particular, the output unit 150 of the present invention can display information generated by reproducing the MMT packet transmitted from the content providing server 200. [

The output unit 150 may be implemented as one touch panel (or touch screen) together with the input unit 120 as described above. When the output unit 150 is implemented together with the input unit 120, Can be displayed.

In addition, the output unit 150 of the present invention may be a liquid crystal display (LCD), a thin film transistor LCD (TFT-LCD), an organic light emitting diode (OLED), a light emitting diode An organic LED, a flexible display, and a three-dimensional display. Some of these displays may also be configured to be transparent or light transmissive so that they can be seen through. This can be configured as a transparent display including TOLED (Transparent OLED).

Thus, the main components of the terminal 100 have been described with reference to FIG. However, not all of the components shown in FIG. 2 are essential components, and the terminal 100 may be implemented by more components than the illustrated components, and the terminal 100 may be implemented by fewer components . For example, the terminal 100 may further include a sound source output unit (not shown) that converts a sound source, which is an electrical signal, into an analog signal and outputs the analog signal. The sound source output unit (not shown) Can output various information generated when the MMT packet is reproduced.

It should be understood that the location of the major components of the terminal 100 shown in FIG. 2 may be changed for convenience or for other reasons.

The main configuration and operation method of the terminal 100 according to the embodiment of the present invention have been described above. The terminal 100 of the present invention can be implemented in various forms. For example, the terminal 100 described in the present specification may be a mobile terminal such as a smart phone, a tablet PC, a PDA (personal digital assistant), a portable multimedia player (PMP) , A smart TV, a desktop computer, etc. may be used.

The terminal 100 according to the present invention can not enumerate all of the variations of the portable apparatus according to the convergence trend of the digital apparatus. However, when the unit of the same level as the above- Any device capable of processing an MMT packet transmitted from the content providing server 200 is applicable to the terminal 100 of the present invention.

Hereinafter, a main configuration and an operation method of the cache apparatus 400 according to the embodiment of the present invention will be described.

Hereinafter, a main configuration and an operation method of the cache apparatus 400 according to an embodiment of the present invention will be described with reference to FIG.

3 is a block diagram illustrating a main configuration of a cache apparatus according to an embodiment of the present invention shown in FIG.

1 and 3, a cache apparatus 400 according to an embodiment of the present invention may include a cache communication unit 410, a cache control unit 420, and a cache storage unit 430.

First, the cache communication unit 410 monitors various data transmitted and received through the core network 320 or the Internet network 310, and transmits and receives data. In particular, the cache communication unit 410 of the present invention performs a process of monitoring information transmitted and received between the terminal 100 and the content providing server 200. To this end, the cache communication unit 410 may include a mirroring module and an injection module although not shown. The mirroring module copies data transferred through the core network 320 or the Internet 310 and transfers the copied data to the cache controller 420. The injection module transmits the data received from the cache control unit 420 to the content providing server 200 or the terminal 100 through the core network 320 or the Internet network 310. Accordingly, the cache communication unit 410 receives the message requesting the MMT to be transmitted to the content providing apparatus 200 through the connection with the terminal 100, or the content providing apparatus 200 transmits the content And monitor and detect the MMT packet transmitted to the AT 100 in response to the request message.

The cache control unit 420 controls the overall operation of the cache apparatus 400. The control unit 350 may receive the MMT packet request and the MMT packet through the cache communication unit 410. [ Particularly, the cache control unit 420 according to the embodiment of the present invention can receive the MMT packet request transmitted from the terminal 100 to the content providing server 200 through the cache communication unit 410. At this time, the MMT packet request may follow the HTTP protocol, for example, in the form of an HTTP GET / RESPONSE message. The cache control unit 420 determines whether the corresponding MMT packet is stored in the cache storage unit 430 according to the MMT packet request and if the MMT packet is stored in the cache storage unit 430, Blocks the packet request, and delivers the MMT packet, which is cached by the content providing server 200, to the terminal 100 on behalf of the content providing server 200. On the other hand, when the MMT packet is not stored in the cache storage unit 430, the cache control unit 420 may control the MMT packet request of the AT 100 to be transmitted to the content providing server 200. [

The cache control unit 420 receives the MMT packet transmitted from the content providing server 200 to the AT 100 via the cache communication unit 410 in response to the request of the AT 100, May be cached in the cache storage unit 430.

The cache control unit 420 checks the extension header of the payload header of the MMT packet and inserts the MMT packet into the cache storage unit 430 according to the inserted caching parameter, ), And when the caching parameter is not inserted in the extension header of the MMT packet, the MMT packet may be bypassed.

The cache storage unit 430 may store an MMT packet transmitted to the AT 100 under the control of the cache controller 420. Here, the MMT packets may be sequentially transmitted to the AT 100 according to the streaming method, and the cache storage unit 430 may sequentially transmit the MMT packets to the AT 100 through the cache control unit 420 You can save some or all of them. The MMT packet at this time may be configured to include a serial number for identifying each MMT packet.

The main configuration and operation of the cache apparatus 400 according to the embodiment of the present invention have been described above.

Hereinafter, the main configuration and operation method of the content providing server 200 according to the embodiment of the present invention will be described.

4 is a block diagram illustrating a main configuration of a content providing server according to an embodiment of the present invention shown in FIG.

1 and 4, a content providing server 200 according to an exemplary embodiment of the present invention may include a server communication unit 210, a server control unit 220, and a server storage unit 230.

The server communication unit 210 plays a role of supporting information transmission / reception with the terminal 100. For example, the server communication unit 210 can receive the MMT packet request from the terminal 100, and can transmit the MMT packet to the terminal 100 in response thereto. The MMT packet can be transmitted to the AT 100 in a streaming form, and a plurality of MMT packets can constitute one asset. In addition, the MMT packet may mean an MPU, and the server communication unit 210 may support a process of sequentially transmitting a plurality of MMT packets to the AT 100 through a single channel according to a streaming method.

The server control unit 220 is configured to perform overall control of the content providing server 200 according to the embodiment of the present invention and may include a packet configuration module 221.

Here, the packet configuration module 221 can play a role of constructing an MMT packet. For example, when content is received from a separate external server, it can support the process of converting the received content into the MMT packet format supporting the MMT protocol. At this time, the packet configuration module 221 of the present invention can determine the block size of the MPU when converting the MMT packet, and configure each MPU according to the determined block size of the MPU to generate the MMT packet. In addition, it is possible to insert the reproduction time information for each MPU, and perform the necessary process so that the terminal 100 synchronizes and reproduces the reproduction time information.

In particular, the packet configuration module 221 according to the embodiment of the present invention configures the corresponding MMT packet so that the MMT packet transmitted to the AT 100 is cached by the cache device 400. In other words, an MMT packet including a packet header, a payload header, and payload data is configured to transmit the configured MMT packet to the AT 100 via the cache apparatus 400, The caching parameter is inserted into the extension header of the payload header to form an MMT packet, and the cache device 400 that has confirmed the MMT packet caches the MMT packet. Here, the caching parameter refers to various parameters related to the caching process during the cache control value, the cache status, and the cache validity period, and the caching parameter defined in the HTTP protocol can be used.

In addition, the server control unit 220 of the present invention can store and manage information about the terminal 100 requesting the MMT packet. At this time, when one of the terminals 100 requests the MMT packet, the terminal 100 can check whether the user is subscribed to the MMT packet service provided by the terminal 100, It is possible to control the terminal 100 to provide the MMT packet.

The server storage unit 230 may store and manage various kinds of information necessary for the operation of the content providing server 200 according to an embodiment of the present invention.

The main configuration and operation method of the content providing server 200 according to the embodiment of the present invention have been described above.

The content providing server 200 according to the embodiment of the present invention has the same hardware configuration as a typical Web server or a network server. However, the software includes a program module implemented through a language such as C, C ++, Java, Visual Basic, Visual C, or the like.

On the other hand, the memory mounted on each device of the present invention stores information in the device. In one implementation, the memory is a computer-readable medium. In one implementation, the memory may be a volatile memory unit, and in other embodiments, the memory may be a non-volatile memory unit. In one implementation, the storage device is a computer-readable medium. In various different implementations, the storage device may comprise, for example, a hard disk device, an optical disk device, or any other mass storage device.

In addition, the term '~ module' used in the embodiment of the present invention means a software component, and '~ module' performs certain roles. By way of example, '~ module' may include components such as software components, object-oriented software components, class components and task components, and processes, functions, attributes, procedures, Routines, segments of program code, drivers, data, databases, data structures, tables, arrays, and variables. In addition, the functions provided in the components and 'modules' may be combined into a smaller number of components and '~ modules' or further separated into additional components and 'modules'.

Although the present specification and drawings describe exemplary device configurations, the functional operations and subject matter implementations described herein may be embodied in other types of digital electronic circuitry, or alternatively, of the structures disclosed herein and their structural equivalents May be embodied in computer software, firmware, or hardware, including, or in combination with, one or more of the foregoing. Implementations of the subject matter described herein may be embodied in one or more computer program products, i. E. One for computer program instructions encoded on a program storage medium of the type for < RTI ID = 0.0 & And can be implemented as a module as described above. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter that affects the machine readable propagation type signal, or a combination of one or more of the foregoing.

Hereinafter, a method of processing MMT packet caching according to an embodiment of the present invention will be described.

5 and 6 are data flow charts for explaining a method of processing MMT packet caching according to an embodiment of the present invention.

Referring to FIG. 5, the terminal 100 transmits an MMT packet request message to the content providing server 200 to receive a specific MMT packet to the content providing server 200 (S101). When it is confirmed that the MMT packet request message is delivered to the content providing server 200, the cache apparatus 400 monitors all the packets transmitted and received between the terminal 100 and the content providing server 200 (S103) ) Confirms whether or not it is caching the corresponding MMT packet (S105). As a result of the checking, it is determined that the cache apparatus 400 is in a cache hit state that it is caching, and the MMT packet that it has cached is provided to the terminal 100 (S107) .

In addition, the present invention is not limited thereto, and the AT 100 may add a caching header indicating a MMT packet that can be processed by the cache apparatus 400 to a general data packet, Or may be delivered to the device 400. At this time, the MMT packet request message may be an HTTP GET / REQEUST message of HTTP protocol, and the MMT packet transmission message may be an HTTP REQPONSE message.

On the other hand, in step S105, if the cache device 400 does not cache the MMT packet requested by the terminal 100, the cache device 400 performs step A. [

The above step A will be described with reference to FIG.

Referring to FIG. 6, if the cache apparatus 400 does not cache the MMT packet requested by the terminal 100, the cache apparatus 400 requests the MMT packet to the content providing server 200 (S201). The MMT packet requesting process may be performed by bypassing the MMT packet transmitted from the AT 100 in step S101 of FIG.

Thereafter, the content providing server 200 configures an MMT packet to deliver the corresponding MMT packet to the AT 100 according to the MMT packet request (S203). The process of configuring the MMT packet is a process of generating an MMT packet by inserting a caching parameter into the MMT packet so that the cache device 400 can perform the caching process. In particular, when configuring an MMT packet including a packet header, a payload header, and payload data, the content providing server 200 inserts a caching parameter in an extension header of the payload header, The cache apparatus 400 can cache the corresponding MMT packet according to the inserted caching parameter of the extension header of the payload header.

Thereafter, the content providing server 200 of the present invention transmits the configured MMT packet to the terminal 100 (S205). The cache device 400 capable of monitoring all packets transmitted and received between the content providing server 200 and the terminal 100 may cache the MMT packet according to the caching parameter when the MMT packet is transmitted from the content providing server 200 (S207), and can be transmitted to the terminal 100 (S209).

Hereinafter, an MMT packet configuration method in the content providing server 200 according to an embodiment of the present invention for performing the above-described processes will be described.

FIG. 7 is a flowchart for explaining a method of generating an MMT packet according to an embodiment of the present invention, and FIGS. 8 to 10 are diagrams for illustrating an MMT packet structure according to an embodiment of the present invention.

Referring to FIGS. 1 and 7, in order to cache the MMT packet transmitted from the content providing server 200, the cache device 400 according to the embodiment of the present invention must include a caching parameter in the MMT packet. To this end, the content providing server 200 according to the embodiment of the present invention uses an extension header of the MMT payload header to insert a caching parameter into the MMT packet.

Here, the structure of the MMT packet will be described in more detail with reference to FIG. 8 to FIG.

8 to 10 are explanatory views for logically explaining an MMT packet structure according to an embodiment of the present invention. First, FIG. 8 shows an MMT package 550, which is a logical model of a data model defined in the MMT functional area, Is the largest MMT entity structured as a single independent content, such as a movie. The content providing server 200 providing the streaming data service can generate the MMT package and provide the MMT package to the terminal 100. The MMT package 550 includes a logical Can be a structured collection. The MMT package 550 may include one or more assets 560, presentation information 551, transport properties 553, and descriptive information, e.g., package information 501.

Presentation information 551 includes information on a relationship between a plurality of assets 560, that is, spatial and temporal relationships, and one content is stored in a plurality of MMT packages 560. [ And may further include information for indicating a relationship between a plurality of MMT packages. The presentation information 551 may be a combination of a hypertext markup language (HTML) and a composition information document as examples of the presentation information 551.

The Asset Delivery Characteristics (ADC) 553 represents quality of service (QoS) requirements and statistics for delivery of the asset 560. A plurality of assets 560 may be associated with one transport property 553. The transport properties (transmission characteristics) 553 at this time can be used to set the parameters of the MMT payload and the MMT protocol by the entity encapsulating the package for effective delivery of the asset 560. [ The transport property 553 may also include transport characteristic information needed to determine the delivery condition of the MMT asset 560 or the MMT packet and may include transport characteristic information such as traffic description parameter and QoS And may include a QoS descriptor. This transfer characteristic information can be expressed in the form of parameters irrespective of the network environment.

Asset 560 refers to the largest logical data unit, meaning an element of a package that encapsulates encoded media data such as audio, video, or web page data with timed or non-timed nature. This asset 560 means a data entity that contains data with the same transfer characteristics. For example, if the MMT package 550 is the largest entity among the data models defined in the MMT functional area, then the asset 560 may be audio data, video data, script data Quot; data unit " These assets 560 logically group MPUs sharing the same Asset ID.

In addition, the MMT packet of the present invention may be substantially configured to include an MMT packet header and an MMT payload.

9, the MMT packet includes an MMT packet header and an MMT payload 570, and the MMT payload 570 includes an MMT payload header 571 and an MMT payload 570. [ (572).

Here, the MMT payload 570 including the MMT payload header 571 and the MMT payload data 572 includes a media processing unit (MPU) 530 constituting an asset 560, which is a logical structure of an MMT package, Unit, hereinafter referred to as MPU). Here, the MPU may be a comprehensive container for timed or non-timed data that is independent of any particular media codec. Such an MPU is 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 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 may also be configured to include portions of data that do not have access unit boundaries for non-timed data. This MPU is a coded media data unit that can be processed completely and independently, and the MMT payload 570, which can be represented by this MPU, is divided into an MMT payload header 571 and a coded MMT payload data 572 And the MMT payload data 572 may be composed of a plurality of MFUs 580. The MFU 580 may further comprise a plurality of media fragment units (MFUs), and the MFU 570 may include an MFU header 581 and MFU data 582 Lt; / RTI >

10, the MMT payload header 571 includes a header_extension field 601, as shown in FIG. 10A. The MMT payload header 570 includes a header field . The extended header field contains user-defined information. The header extension mechanism enables applications and media types that require additional information to be carried in the payload format header, for proprietary extensions to the payload format. The header extension mechanism is designed in such a way that it can be discarded without affecting the correct processing of the MMT package. The extension header included in the extension header field may include a structure as shown in FIG. 10B. Here, the content providing server 200 according to the embodiment of the present invention constructs an MMT packet by inserting a caching parameter for caching into an extension header value (header_extension_value) 603 of the extension header 601 field shown in FIG. 10B do.

A concrete example of a caching parameter inserted into the extension header value 603 of the present invention is shown in FIG. 10C and includes a cache control value, a cache state, a cache expiry time, Modification time, and so on.

Referring again to FIG. 7, in the MMT packet having such a structure, for the MMT packet caching according to the embodiment of the present invention, as described above, the content providing server 200 inserts a caching parameter in the extension header, (S305 to S307), the configured MMT packet is transmitted to the terminal 100 (S307), and the cache device 400 monitoring the MMT packet transmits a caching parameter to the extension header of the MMT payload header of the MMT packet , The corresponding MMT packet is cached according to the caching parameter inserted in the MMT payload data.

According to the construction of the MMT packet, the cache apparatus providing the CDN service caches the MMT packet according to the caching parameter inserted in the MMT packet and provides the MMT packet to the terminal, The content providing server of the present invention constructs an MMT packet by inserting a specified identifier for caching processing into the type field of the MMT payload header and inserting a caching parameter for caching into the MMT payload data, It is possible to more easily support MMT packets to be cached in the cache device.

The MMT packet caching method and the MMT packet generation method for caching according to the embodiment of the present invention have been described above.

The MMT packet caching method of the present invention and the MMT packet generating method for caching processing as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. The MMT packet caching method according to an embodiment of the present invention and the program recorded on a recording medium for implementing the MMT packet generation method for caching processing, when receiving an MMT packet transmitted from the content providing server to the terminal, Checking whether a caching parameter is inserted in an extension header of the payload header of the extension header, and caching the MMT packet according to the caching parameter when the extension parameter includes a caching parameter in the extension header Comprising: constructing an MMT packet including a packet header, a payload header and payload data, and transmitting the constructed MMT packet to a terminal via a cache device, A process of including a caching parameter for caching in the header, and the like.

Such computer-readable media suitable for storing computer program instructions and data include, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. The functional program for implementing the present invention and the related code and code segment may be implemented by programmers in the technical field of the present invention in consideration of the system environment of the computer that reads the recording medium and executes the program, Or may be easily modified or modified by the user.

In addition, a computer program recorded on a computer-readable recording medium as described above includes instructions for performing the functions as described above, distributed and distributed through a recording medium, read and installed in a specific device, a specific computer, Thereby performing the above-described functions.

In order to allow the computer to read the program recorded on the recording medium and to execute the functions implemented by the program, the computer program described above may be stored in a computer such as a C, C ++ , JAVA, machine language, and the like, and code for a program command encoded in a computer language.

The code may include a function code related to a function or the like that defines the functions described above and may include an execution procedure related control code necessary for the processor of the computer to execute the functions described above according to a predetermined procedure. In addition, such code may further include memory reference related code as to what additional information or media needed to cause the processor of the computer to execute the aforementioned functions should be referenced at any location (address) of the internal or external memory of the computer . In addition, when a processor of a computer needs to communicate with any other computer or server that is remote to execute the above-described functions, the code may be stored in a memory of the computer using a communication module of the computer, It may further include a communication-related code such as how to communicate with another computer or a server, and what information or media should be transmitted or received during communication.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

The present invention relates to an MMT (MPEG Media Transport), and more particularly, a content providing server inserts a caching parameter using an extension header of a payload header of an MMT packet so that a cache apparatus can cache and process an MMT packet An MMT packet caching method and apparatus for configuring an MMT packet, an MMT packet generation method for caching processing, and an apparatus therefor.

According to the present invention, the cache device providing the CDN service caches the corresponding MMT packet according to the caching parameter defined in the MMT packet, and provides the MMT packet to the terminal, thereby enabling faster contents provision for the MMT packet, It can contribute to the development of industry.

In addition, since the present invention is not only possible to be marketed or operated, but also can be practically and practically carried out, it is industrially applicable.

100: terminal 110:
120: input unit 130:
140: storage unit 150: output unit
200: content providing server 210: server communication part
220: server control section 221: packet configuration module
230: server storage unit 300: network
310: Internet network 320: Core network
330: access network 400: cache device
410: cache communication unit 420: cache control unit
430: cache storage unit 1000: MMT caching system

Claims (10)

A method of processing an MPEG media transport (MMT) packet caching by a cache apparatus,
The cache device
Confirming whether a caching parameter is inserted in an extension header of a payload header of the MMT packet when an MMT packet transmitted from the content providing server to the terminal is received; And
Caching the MMT packet according to the caching parameter when the caching parameter is inserted in the extension header;
The method comprising the steps of: The method according to claim 1,
After the caching step,
Receiving a specific MMT packet request from any other terminal;
Determining whether the other terminal is caching the MMT packet requested by the other terminal; And
If the MMT packet is cached, transmitting the cached MMT packet to the other terminal;
The method comprising the steps of: The method according to claim 1,
Bypassing the MMT packet if the caching parameter is not inserted;
Further comprising the steps of: The method according to claim 1,
The verifying step
And checking whether a caching parameter is inserted in an extension header value of the extension header. A method for generating an MPEG Media Transport (MMT) packet for a caching process by a content providing server,
Constructing an MMT packet comprising a packet header, a payload header and payload data; And
Transmitting the configured MMT packet to a terminal via a cache device;
/ RTI >
Wherein a caching parameter for caching is included in an extension header of the payload header. 6. The method of claim 5,
The caching parameter
Wherein the cache control value includes at least one of a cache control value, a cache status, and a cache validity period. A computer-readable recording medium on which a program for executing the method according to any one of claims 1 to 6 is recorded. 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. An apparatus for processing an MPEG media transport (MMT) packet caching,
A cache communication unit for monitoring the MMT packet transmitted from the content providing server to the terminal and transmitting the monitored MMT packet to the cache control unit;
A cache control unit for controlling the cache memory unit to cache the MMT packet according to the caching parameter when the MMT packet is transmitted through the cache communication unit and a caching parameter is inserted in an extension header of the payload header of the MMT packet, ; And
A cache storage unit for caching the MMT packet under the control of the cache control unit;
Wherein the MMT packet caching process comprises: An apparatus for MPEG media transport (MMT) packet generation for caching processing, the apparatus comprising:
A server controller configuring an MMT packet including a packet header, a payload header, and payload data; And
A server communication unit for transmitting the configured MMT packet to a terminal via a cache device;
/ RTI >
Wherein the server controller configures the MMT packet so that a caching parameter is included in an extension header of the payload header.

Images