WO2012099403A2 - Method and apparatus for transmitting/receiving content in a broadcast system - Google Patents

Abstract

The present invention relates to a content-transmission system, and more particularly, to a method and apparatus for transmitting content in a content-transmission system. The present invention relates to an apparatus and method in which a service provider constructs a service using a plurality of pieces of content, and transmits the service via one or more paths over a heterogeneous network, such that the service may be consumed in a converged environment.

Description

Method and device for transmitting / receiving content in broadcasting system

The present invention relates to a method and apparatus for transmitting / receiving content in a broadcast system, and more particularly, to an apparatus and method for transmitting / receiving content through a heterogeneous network in a broadcast system supporting a multimedia service based on an Internet protocol.

The service provider tries to provide more information on one service screen. As a result, the screen of the frequently viewed news may have a smaller portion of the screen due to the ticker, stock information, and news titles.

Current broadcasting and communication environments providing such services are becoming increasingly complex. Each technology is being blended with other technologies through revisions. As a result, consumers consume multiple contents simultaneously in a convergence environment. Consumers can also search for TVs on tablets and view the results. In addition, as the performance of the receiver is increased, devices capable of accessing a plurality of heterogeneous communication networks at home or on the move are being introduced by fusing broadcast and communication together with a large screen and a high resolution display.

As such, new methods for flexibly delivering services to consumers in various environments are required.

The present invention provides an apparatus and method for constructing a service using a plurality of contents by a service provider and transmitting the same using one or a plurality of paths on a heterogeneous network.

The present invention provides an apparatus and method for consuming a service using a plurality of contents in a convergence environment.

According to an embodiment of the present invention, a method for transmitting a content to be transmitted through a heterogeneous network in a broadcasting system supporting a multimedia service based on an Internet protocol is provided. The method includes generating at least one package including an MPEG Media Transport (MMT) item. And providing the at least one package to the terminal, wherein the MMT item includes MMT assets and configuration information of the MMT assets.

An apparatus according to an embodiment of the present invention is a content transmission apparatus to be transmitted through a heterogeneous network in a broadcasting system supporting a multimedia service based on an Internet protocol, and generates at least one package including an MMT (MPEG Media Transport) item. A package generation unit and a transmission unit for transmitting the at least one package to the terminal, wherein the MMT item includes MMT assets and configuration information of the MMT assets.

According to an embodiment of the present invention, in a method for receiving content through a heterogeneous network in a broadcasting system supporting a multimedia service based on an Internet protocol, a method of receiving at least one package including an MMT (MPEG Media Transport) item Analyzing the package and processing an MMT item and an MMT asset included in the package according to the analysis result, wherein the MMT item includes MMT assets and configuration information of MMT assets.

An apparatus according to an embodiment of the present invention is a receiving unit for receiving at least one package including an MMT (MPEG Media Transport) item in a content receiving apparatus through a heterogeneous network in a broadcasting system supporting a multimedia service based on an Internet protocol. A package analyzing unit analyzing the package and a processing unit processing an MMT item and an MMT asset included in the package according to the analysis result, wherein the MMT item includes MMT assets and configuration information of the MMT assets.

1 is a block diagram showing a transmission system architecture based on MMT;

2 is an MMT item, an MMT asset, and a package configuration diagram;

3 is a package and slice list configuration diagram,

4 is a diagram illustrating a temporal and spatial MMT asset configuration of an MMT item;

5 is a block diagram of a service provider according to an embodiment of the present invention;

6 is an operation flowchart of a service provider according to an embodiment of the present invention;

7 is a block diagram of a playback apparatus according to an embodiment of the present invention;

8A and 8B are flowcharts illustrating operations of a playback apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that like elements are denoted by like reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted.

It should also be noted that the terms or words used in the specification and claims described below are not to be construed as being limited to the common or dictionary meaning.

The MPEG-2 standard introduces unnecessary overhead when transmitting using unidirectional communication, transmission inefficiency due to fixed frame sizes, transmission protocols specific to audio / video, and Internet protocol (IP). It was proposed by MPEG to overcome the limitations of Moving Picture Expert Group-2 Transport Stream (TS). For example, the MMT standard may be applied to efficiently transmit a plurality of contents through heterogeneous networks. Here, the plurality of contents means a set of contents having multimedia elements by video, audio, and application. The heterogeneous network refers to a network in which a broadcast network and a communication network are mixed.

In addition, the MMT standard aims to define a transport technology that is more friendly to IP, which is a basic technology in a transport network for multimedia services.

Accordingly, the MMT standard is to provide an efficient MPEG transmission technology in a multimedia service environment that is typically changed based on IP, and standardization has been progressed with continuous research. In particular, the MMT standard needs to provide a method for providing an efficient MPEG transmission technology in a multimedia service environment in which a hybrid network (or a heterogeneous network) and a hybrid content are provided.

Therefore, in the present invention, if a service provider constructs a service using a plurality of contents and transmits the service using one or a plurality of paths on a heterogeneous network, the service can be consumed in a converged environment.

1 is a block diagram illustrating a transmission system architecture based on MMT.

The MMT divides a transmission system environment into an encapsulation (100), a delivery (120), and a control (130) to configure a role and to be in a cooperative relationship.

An encapsulation layer (hereinafter, referred to as 'layer E') should generate MMT items using MMT assets. MMT assets are composed of elements such as video, audio, web contents, applications, and the like. Each MMT asset may be independent content for user consumption. Layer E has two sublayers. The second sub-layer E.2 generates MMT assets and provides configuration information of the MMT assets. E.2 communicates with control layers to provide MMT asset information. The first sub layer E.1 generates an MMT package. The MMT package is stored and used to deliver MMT items consumed by the user. The MMT package may deliver a live type of MMT items, a file type of MMT items, and a hybrid type of MMT items. E.1 also provides relevant information of MMT assets in a package. Layer E communicates with layer C and layer D to deliver the MMT package.

The delivery layer (hereinafter, referred to as 'layer D') must deliver the MMT package and data received from the layer C to the receiving end. For efficient delivery, layer D uses an access unit (AU). Each MMT item (or package) may have a different type of AU because the QoS characteristics may be different. Layer T also consists of two sublayers. D.1 creates an AU based on the characteristics and data of the package from layer C. For QoS, D.1 communicates with Layer C and Layer D. D.2 generates D frames and provides the functionality of flow control. D.2 also provides information on the D-Frame that can be used by network nodes for QoS guarantees.

The control layer (hereinafter, referred to as 'layer C') manages all functions required for MMT assets and MMT item consumption. Layer C.1 provides the functionality of MMT assets, MMT item information and consumption related information, manages connectivity to MMT packages, and provides device capabilities such as codec and memory status. Manage. Layer C.2 shall perform session management and data transmission generated in layer C for MMT D frames.

The Encapsulation 100 types (ie, embodies or encapsulates) the service that the service provider intends to provide.

The delivery 120 transmits the content at the quality required by the service when one of the available paths between the service provider and the consumer is selected.

The control 130 displays a path through which the container and the content constituting the service can be provided along with a list of services currently available for starting the service.

2 illustrates a configuration diagram of an MMT item, an MMT asset, and a package.

MMT Encapsulations are composed of MMT item, MMT asset, package, and slice. The MMT item is a service to be provided by a service provider, and represents a minimum unit that a consumer can purchase. The MMT item consists of MMT assets and configuration information of the MMT assets.

The MMT asset is a component constituting the MMT item and represents a minimum unit that can be consumed. For example, the MMT asset includes MPEG-2 TS, Moving Picture Expert Group-2 Program Stream (MPEG-2 PS), mp4, mp21, MPEG-U Widget, Application, Image, and Dynamic Adaptive Streaming over HTTP (DASH). In addition, the MMT asset may be provided from different MMT asset providers.

The package encapsulates MMT assets. The MMT item is included in one or several packages and transmitted.

Slice represents one or several slices of an MMT asset.

The package may include one or several MMT assets. The package includes a list of MMT assets, transmission characteristics of each MMT asset, detailed description, slice list, MMT item configuration information, and MMT asset as payload.

1.1.1 Components

3 shows a package and slice list configuration diagram.

As illustrated in FIG. 3, the package includes a list of MMT assets, MMT item configuration information, and MMT assets. The list of MMT assets includes transmission characteristics, detailed description, and slice list of each MMT asset.

1.1.1.1 MMT asset list

The MMT asset list provides a list of MMT assets in one package. The MMT asset list also provides a list of assets in another package. The MMT asset list includes id, transmission characteristics, detailed description, and slice list for each MMT asset. The actual MMT asset is stored as payload of the package.

1.1.1.1.1 Transport characteristics

Transport characteristics of the service provider's point of view recommended for playing the MMT asset are displayed. Transmission characteristics are a requirement to ensure quality when transmitted. Informs the information required for the MMT asset to be properly transmitted and consumed. The MMT asset may be played in perfect or loosely synchronized with other MMT assets on the time axis of the MMT item. In addition, all clients connected to the service provider may need to be played simultaneously based on the wall clock. Alternatively, depending on the type of MMT asset, transmission may be performed without error or loss (widget, program) or loss may be allowed (adaptive streaming, frame drop). Finally, MMT assets may require unicast or bidirectional connections. Connection types include one-to-one, one-to-n, one-way and two-way. In addition, loss loss, loss allowance, and connection relationship are included in the transport characteristics.

These requirements from the service provider's point of view are passed to MMT-Delivery or MMT-Control and used to map numerical and physical characteristics according to the functions provided by each.

1.1.1.1.2 Detailed description

Information required for individually consuming or storing the MMT asset, for example, a filename, a mime-type, and the like of the MMT asset are provided. Used to store or separately consume MMT assets. The detailed description may include things that are property values of the asset, in addition to contents in which the properties of the asset are enumerated.

1.1.1.1.3 Slice list

As shown in FIG. 3, the MMT asset is divided into slices and stored in a payload. The slices can be one or several and each slice does not have to be the same length. According to the characteristics of the MMT asset, when slices are separated and stored temporally, spatially and semantically, they can be used to map from D1 to AU (Access Unit). A slice has a relative position on the payload, its length, and the pts time of that slice. The Slice list indicates how the slices cut the MMT asset are distributed on the payload.

1.1.1.2 MMT asset-slices structure

MMT items are designed to be used for storage and transmission. The general structure is basically used for storage purposes. Interleave is used for streaming transmission. The live structure is used for live streaming of infinite length.

1.1.1.2.1 General

[Header | List | Configuration] [MMT asset A, B, C]

One MMT asset is stored as one slice.

1.1.1.2.2 Normal + trick mode

[Header | List | Configuration] [MMT asset A1A2A3 ..., B1B2B3 ..., C1C2C3 ...]

As shown in FIG. 3, one MMT asset is divided into several slices and stored. The time point on the MMT asset individual time axis may be known through a presentation time stamp (pts) of the slice.

Slice is cut and provided in units of seconds or group of pictures based on pts.

1.1.1.2.3 Interleaving

[Header | List | Configuration] [MMT asset A1B1C1A2B2C2A3B3C3, ...]

As shown in FIG. 3, one MMT asset is divided into several slices and stored. MMT assets to be reproduced together are interleaved and stored.

Slice is provided by cutting in units of seconds or group of pictures based on pts. Slices of MMT assets representing the same time zone may be provided as a group according to the order of time expressed on the time axis of the MMT item.

1.1.1.2.4 Live

[Header | List | Configuration] [MMT asset A1B1C1] [Header | List | Configuration] [MMT asset A2B2C2] ...

Several MMT assets to be played together are divided into slices and stored in appropriate time units.

A package transmits only a part of MMT assets and assumes that a package having the same id among subsequent packages is transmitting the rear part of the MMT asset. At this time, the sequence number is checked to determine whether the sequence number of the previous package and the sequence number of the subsequent package are increased by one. If the sequence number has not increased by 1, this is a case where the package has been repeatedly sent for special purposes and should not be used unless there is a problem with the transfer. However, if the sequence number has increased by more than 1, you have not received a package that should have been sent in the middle, so you will need to request retransmission or reset the parameters needed to play the package.

Considering the broadcast transmission, the package interval can be adjusted according to the transmission time and transmission rate. When a package is transmitted by broadcast, the rate is theoretically calculated at a fixed bit rate and specifies the size of the package so that the header of one or more integer packages starts at a given time, for example, 0.7 seconds. In this case, information corresponding to additional information, for example, MMT asset description, transmission characteristics, and MMT item configuration information may be omitted from the header of the package of the intermediate section that does not correspond to 0.7 seconds. At this time, the omitted information is considered to be valid between MMT items having the same package id.

1.1.1.3 MMT item configuration information

4 illustrates a temporal and spatial MMT asset configuration diagram of an MMT item.

MMT item is composed of MMT assets.

The MMT item configuration indicates the configuration of the corresponding / different encapsulation in the time and space of the MMT item, the configuration of the MMT asset in the encapsulation, and the configuration of the MMT asset component in the MMT asset in the encapsulation. The MMT item configuration information has the following entities as sub-components, and how the MMT asset is arranged on the playing time and space of the MMT item and between each MMT asset as intended by the service provider through the MMT item configuration information Tell the relationship.

-Service configuration information of other packages

MMT assets in the same or different packages

Component in an MMT asset in the same or another package

Description of MMT item configuration information

As illustrated in FIG. 4, it describes when and what part of the MMT asset is displayed and when it is displayed on the reproduction time of the MMT item.

As illustrated in FIG. 4, it describes which part of the MMT asset is displayed and where in the expression space of the MMT item.

Indicates a relationship between MMT assets.

1.1.1.3.1 Schema

1.1.1.3.2 Semantics

Configuration information of MMT item is an xml document and is represented using seq, par, and sel elements. If the format is other than xml, other methods (e.g. fields, boxes such as ISOFF, etc.) that play a corresponding role are possible.

The Seq element executes the child elements in order.

Par elements execute child elements in parallel at the same time.

-Sel element selects and executes only one of its child elements.

The three elements have start as an attribute.

Start is the time on the MMT item time base that the element starts at.

The above three elements have divs as child elements.

Div is a temporal and spatial place holder for MMT assets.

Div element has target_characteristic as an attribute.

Target_characteristic is a characteristic required for executing the MMT asset. Even if all of the above described characteristics are not satisfied, it is recommended that the closest reproducing apparatus available among those available for reproducing the MMT item reproduce.

Target_characteristic values include main, 3d, interactivity, remote, n-screen, and mvc. However, this is not limitative.

 ° Main: means the playback device which is the center.

 ° 3d: means a device that supports 3-D playback.

 ° Mvc: It means MVC playback support device.

 N-screen: means an n-screen configuration device or a plurality of devices participating in n-screen configuration.

 Remote: stands for remote controller.

 Interactivity: A device that can receive user interactive input.

This can be used to represent the following relationships;

Relationship 1. MMT asset A can be played only when MMT asset B is present. (dependent)

-As shown in Table 1, the MMT asset B can be independently reproduced even without the MMT asset A. (independent)

Table 1

Relationship 2. MMT asset C, MMT asset D, and MMT asset E are relationships in which only one is selected on the time axis as shown in Table 2 below.

TABLE 2

Relationship 3. MMT asset F, MMT asset G, and MMT asset H are relationships that must be performed together as shown in Table 3 below. (More compelling AND)

TABLE 3

Which part of the MMT asset is temporally and where to play the MMT item in time can be expressed as in <Example 1>. In <Example 1>, the temporal portion of the MMT asset uses a URL fragment identifier.

<Example 1> Syntax of Table 4 below shows a case in which MMT asset 1 or MMT asset 1 and MMT asset 2 are reproduced from 100 seconds to 200 seconds in MMT item time 50 seconds.

Table 4

Which part of the MMT asset is spatially reproduced and which part of the MMT item is spatially reproduced can be expressed as in <Example 2> below.

<Example 2> The following Syntax shows a case where (0,0 × 800,600) of MMT asset 1 is attached to (100,100 × 800,600) of MMT item. (0,0) and (100,100) represent (x-axis, y-axis), and (800,600) represent (width, height).

<seq>

       <par>

  <div x = 100 y = 100 width = 800 height = 600 source = "self: // asset # identifier = 2 * time (100s, 200s) * rect (0,0,800,600)">

      </ par>

</ seq>

When an MMT item is played on various devices, which MMT asset is played on which device can be expressed as in <Example 3>.

<Example 3> In the following syntax, MMT asset 1 is displayed on the main device and MMT asset 2 is displayed on the second device.

target_characteristics = main, 3d, interactivity, remote, n-screen, mvc ...

<seq>

    <par>

       <div target_characteristics = "main" source = "self: // asset # identifier = 1">

 <div target_characteristics = "interactivity | remote" source = "self: // asset # identifier = 2">

   </ par>

</ seq>

As shown in the above Syntax, Asset 1 can be displayed to the user as a main device (eg, TV screen), and Assest 2 as a second device (ie, a web page of a mobile phone).

1.1.2 Syntax

Syntax is shown in Table 5 below.

Table 5

1.1.3 Semantics

whether to use sequence number; Use only for live.

// number of consecutive containers when delivering live content

// whether to use timestamp; In the case of VoD, the container is parsed at the time of transmission.

// the time the container should be decoded / parsed (Decoding Time Stamps: DTS)

mmt_asset_list ()

List of MMT assets in the package

Transmission characteristics

Transmission characteristics of package and transmission characteristics of MMT asset. The transmission characteristics that the MMT asset should have in the unit of a package or in units of MMT assets in the package are described at a high level. In MMT-C, the transmission characteristics are mapped to a network path that can be provided by an MMT item provider. The MMT-T transmits a path on a network provided by the MMT-C.

In order to transmit the MMT asset in various environments, a path that can be provided to the MMT asset should not be written. It is not meaningful to write down the path as it may vary depending on the environment. The actual path is provided in another layer-C, and the hint that creates the path separates the content from the delivery environment.

Transport characteristics () {

sync_alignment

client_alignment

lossless_delivery

return_channel

}

sync_alignment

0: play when available (Even if it is sent later than the time you want to play it, you only need to start playing after receiving it.)

1: loose sync (no sync, no subtitles)

2: lip-sync (I feel strange when I'm out of sync. Lip-sync)

3: reserved

client_alignment

0: All clients should start on time.

1: Even if the live broadcast, the start time may be different for each client.

lossy_delivery

0: There should not be a transmission error (eg widget)

1: Transmission error, quality adaptation, etc. are possible.

has_interactivity

0: unidirectional Example: Broadcast channel

1: bidirectional; There must be a return channel.

mmt_asset_description ()

The mime-type and file name are provided when the mmt asset is stored or separately consumed.

mmt_asset_slice_list ()

List of slices divided by mmt asset

slice_pattern

The value is described depending on whether slice is a regular array, or whether trick mode, live transfer, or file transfer is considered.

slice ()

The fragment divided by mmt asset. In the case of live transmission, slice is composed of Access Unit units such as MPEG-2 and MPEG-4.

mmt_item_composition ()

Configuration information of the mmt asset.

xml ()

5 is a flowchart illustrating an operation of a service provider according to an exemplary embodiment of the present invention.

The operation of FIG. 5 is of course performed at the service provider of FIG. 6. However, it is not limited to the service provider of FIG. 6.

In step 501, the service provider receives an MMT asset from an MMT asset provider and configures an MMT item to be sold using the MMT asset. When the MMT asset is provided as it is, there is no way to describe the configuration of the MMT item. Therefore, MMT item configuration information for describing how to configure the MMT asset within the MMT item should be provided.

The MMT item configuration information is preferably provided together with the MMT asset. Accordingly, the MMT item configuration information is loaded and provided using a header-payload structure called a package.

Packages are created by the service provider to compose MMT items, and several packages may be used to compose one MMT item.

A package is identified by its package id, MMT item id, and sequence number. The package has the MMT item id it represents. The package id is for distinguishing between different packages. Even if the package ids are different, if the MMT item ids are the same, they are different packages that compose the same MMT item. If different packages with the same package id exist, they are distinguished by sequence number. There is a method of making a small package and transmitting the package several times for the above-mentioned purposes such as live broadcasting. At this time, the sequence number is used to check whether there is a missing package in the front and rear relationship.

After creating a MMT item, the service provider uses MMT-Control and MMT-Delivery to make the discovery information and transmission information of the MMT item accessible to the playback device. The initiation of the transmission may be at the request of the playback device in the case of a one-to-one relationship or in any transmission in which the participation of any playback device is expected in the case of a one-to-many relationship or broadcast transmission.

Referring to FIG. 5, the service provider creates an MMT item in step 501 and determines whether an MMT asset is created in real time in step 503. That is, the service provider determines whether live transmission is possible. If the live transmission is possible, the service provider generates a package in step 505. In step 507, the service provider inserts header information into the package. At this time, when inserting header information, the same package id is used. In addition, when the header information is inserted in step 509, the service provider inserts creation time information using a time stamp. In addition, the service provider increments the sequence number by 1 when inserting the header information for transmission live at step 511. Thereafter, the service provider generates a payload in step 513. As such, the MMT asset is stored by generating the payload.

Simultaneously with the generation of the package in step 505, the service provider generates an MMT asset in step 515. Thereafter, the service provider proceeds to step 513.

If the MMT asset is not generated in real time in step 503, the service provider determines whether to support the trick mode in step 517. If the trick mode is supported, the service provider generates a package in step 519. In step 521, the service provider inserts header information into the package.

The service provider identifies MMT item configuration information in step 523. Thereafter, the service provider generates a payload in step 525. As such, the MMT asset is stored by generating the payload.

Simultaneously with the creation of the package in step 519, the service provider has an MMT asset in step 529. In step 531, the service provider slices an MMT asset used on an MMT item time axis in units of time and proceeds to step 525.

After the step 525, the service provider completes the package generation in step 527.

If the trick mode is not supported in step 517, the service provider generates a package in step 533. Thereafter, the service provider inserts header information into the package in step 535 and generates a payload in step 537. As such, the MMT asset is stored by generating the payload. The service provider completes package generation in step 539.

Simultaneously with the generation of the package in step 533, the service provider has an MMT asset in step 541. Thereafter, the service provider proceeds to step 539.

6 is a block diagram of a service provider according to an embodiment of the present invention.

The MMT MT asset is provided to the service provider 600. Then, the MMT asset decoder 620 in the service provider 600 receives the MMT asset and decodes the MMT asset.

The MMT item generator 630 creates an intended MMT item by reflecting the decoding result of the MMT asset decoder 620. In this case, the MMT item generating unit 630 is used as a component, and delivers information about the MMT item and the MMT asset to the package generating unit 635 to store in the package.

The package generator 635 receives the MMT asset from the buffer 1 625 and stores the MMT asset as a payload in the package, and stores the MMT asset in the buffer 2 640 again. The service provider 600 delivers information about the package to the MMT-Control 660 to provide the package, and delivers the information about the package to the playback device through the storage device 645, the network 650, or the like.

7 is a block diagram of a playback apparatus according to an embodiment of the present invention.

The reproduction device may know the existence of the MMT item, a transmission method, a path, etc. for transmitting the same through the MMT-Control. When playback of the MMT item is instructed by the user or automatically, the playback device receives the package constituting the MMT item and starts playback of the MMT item.

In the package, transmission requirements necessary for proper execution of the MMT asset for each MMT asset are indicated in the transmission characteristics. In order to download the MMT asset, the playback device selects a path that can be supported by the playback device from a plurality of available paths provided by the service provider and downloads the MMT asset. If the path taken down by changes in the surrounding environment is no longer available, the playback device is responsible for changing the network device for seamless transmission or playback.

At the start of transmission of one MMT asset, the playback device attempts to divide a portion of the MMT asset from the available path periodically within the range that does not impair the playback and transmission performance of the entire playback device when more than one path is available. Since the MMT asset is divided into slices and the slice list is also given to the package, it is possible to download and download different slices for a plurality of paths.

Types of playback devices include home servers, main display devices, subdisplay devices, and the like. After the playback device receives the configuration packages of the MMT item from the service provider through the home server, the playback device searches for a playback device to which the MMT assets are appropriately played and instructs the playback device to play the MMT asset.

To this end, the home server of the playback apparatus refers to the MMT item configuration information. This information specifies where the MMT assets should be represented in terms of time and space, and what device capabilities are required in target_characteristic. That is, if the value corresponding to the property cannot be supported by the playback device connected to the home server, it is inevitable. However, among the plurality of playback devices connected to the home server, the MMT asset may be played by the playback device that satisfies the target_characteristic. To be able.

Referring to FIG. 7, the playback device may know the existence of an MMT item and a path on a network of a package configuring the MMT item through the MMT-Control.

Receiving unit 712 collectively includes everything that can accept information from the outside over the wired and wireless network, through which the package is transmitted. The package may be primarily stored in package buffer 1 714 for processing and may be temporarily or semi-permanently stored in storage 716 in the playback device as needed. The package is passed to the package parser 718 for interpretation, and the header information of the package is stored in the buffer 2 720 and used in the case of a continuous package such as a live broadcast. The MMT item description in the package header is processed by a separate processing unit, which becomes the main processing unit for presenting the MMT item to the user. Since the MMT item displays the MMT asset on the time / space axis, the MMT asset stored in the buffer 3 724 is transmitted to the MMT asset processing unit 726 and then transferred to the display device 728 at a proper time. Final consumption. If the user issues a trick play command such as fast forwarding or playing after 30 seconds during playback, it is transmitted to the MMT item description processing unit 722, where the requested time corresponds to any of the MMT item time axis, and certain MMT assets are displayed. After re-determining whether it should be, the corresponding MMT asset is processed by the processor.

8A and 8B are flowcharts illustrating operations of a reproducing apparatus according to an exemplary embodiment of the present invention.

8A and 8B are of course performed in the playback apparatus of FIG. However, the present invention is not limited to the playback apparatus in FIG.

In step 801, the playback apparatus plays back the MMT item and receives information including whether the MMT item is recognized, the path is recognized, the live and the trick mode are supported. In step 805, the playback apparatus determines whether the transmission is a live transmission. If live, the playback device receives the package in step 807, and determines whether the package ids are the same in step 809. If the package ids are the same, the playback apparatus determines whether the sequence number has increased in step 811. If the sequence number is increased, the playback apparatus determines whether the MMT item description exists in step 813. If there is an MMT item description, the playback apparatus stores the MMT item description in a buffer in step 815 and interprets the MMT item description in step 817. Thereafter, the playback device receives the associated package in step 819, and plays the MMT item in step 821. The playback device returns to step 807 again.

If the package ids are not the same in step 809, and the sequence number does not increase in step 811, the playback apparatus returns to step 807. If there is no MMT item description in step 813, the playback apparatus proceeds to step 817.

On the other hand, if it is not a live transmission in step 805, the playback device receives a package associated with the package as well as the package in step 823, and interprets the MMT configuration information list in step 825. In step 829, the playback device plays the MMT item. In step 831, the playback apparatus receives a user trick command, and determines whether to support a trick mode in step 833. If the trick mode is supported, the playback apparatus searches for an MMT asset corresponding to a time on the MMT item in step 835. As a result of the search, the playback apparatus obtains pts by comparing the MMT item time and the MMT asset time in step 837.

In operation 839, the playback apparatus identifies a slice and searches for a slice corresponding to pts. The playback device plays the MMT item in step 841.

If the trick mode is not supported in operation 833, the playback apparatus searches for an MMT asset corresponding to a time on the MMT item in operation 843. The playback device determines whether all necessary MMT assets have been downloaded in step 845. If all necessary MMT assets have been downloaded, the playback device plays the MMT item in step 847.

According to the present invention, a service provider configures a service using a plurality of contents and transmits the service using one or a plurality of paths on a heterogeneous network.

The present invention can consume an efficient service using a plurality of contents in a convergence environment.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

Claims (32)

1. In the broadcast system supporting a multimedia service based on the Internet protocol, a content transmission method to be transmitted through a heterogeneous network,

   Generating at least one package including an MPEG Media Transport (MMT) item; And

   Providing the at least one package to a terminal;

   Wherein the MMT item includes MMT assets and configuration information of MMT assets.
2. The method of claim 1,

   The package includes at least one of a list of MMT asset, MMT item configuration information, and MMT asset.
3. The method of claim 2,

   The list of MMT assets,

   And at least one of a transmission characteristic, a detailed description, and a slice list of each MMT asset.
4. The method of claim 2,

   Configuration information of the MMT item,

   And information on how to arrange the MMT asset in at least one of a time and a space of the MMT item.
5. The method of claim 2,

   Configuration information of the MMT item,

   If the MMT item is arranged in a plurality of devices, the content transmission method comprising information on which asset is placed in which of the plurality of devices.
6. The method of claim 2,

   Configuration information of the MMT item,

   And at least one of service configuration information of another package, MMT asset information in the same or another package, and components in the MMT asset in the same or different package.
7. The method of claim 2,

   In the case of general broadcasting, the package is divided using a package id and an MMT item id.

   In the case of live broadcasting, the package is classified using a package id, an MMT item id, and a sequence number.
8. The method of claim 2,

   In the normal mode, one MMT asset is stored as one slice,

   In the trick mode, the one MMT asset is stored as a plurality of slices,

   The time point on the time axis of the plurality of slices is represented by a presentation time stamp (pts).
9. An apparatus for transmitting content to be transmitted through a heterogeneous network in a broadcasting system supporting a multimedia service based on an internet protocol,

   A package generation unit generating at least one package including an MPEG Media Transport (MMT) item; And

   It includes a transmission unit for transmitting the at least one package to the terminal,

   The MMT item includes MMT assets and configuration information of the MMT assets.
10. The method of claim 9,

    The package may include at least one of a list of MMT assets, MMT item configuration information, and MMT assets.
11. The method of claim 10,

    The list of MMT assets,

    And at least one of a transmission characteristic, a detailed description, and a slice list of each MMT asset.
12. The method of claim 10,

    Configuration information of the MMT item,

    And information on how to arrange the MMT asset in at least one of a time and a space of the MMT item.
13. The method of claim 10,

    Configuration information of the MMT item,

    If the MMT item is arranged in a plurality of devices, the content delivery device comprising information on which asset is placed in which of the plurality of devices.
14. The method of claim 10,

    Configuration information of the MMT item,

    And at least one of service configuration information of another package, MMT asset information in the same or another package, and components in the MMT asset in the same or different package.
15. The method of claim 10,

    In the case of general broadcasting, the package is divided using a package id and an MMT item id.

    In the case of live broadcast, the package is characterized in that the content is divided using a package id, MMT item id, sequence number.
16. The method of claim 10,

    In the normal mode, one MMT asset is stored as one slice,

    In the trick mode, the one MMT asset is stored as a plurality of slices,

    And a time point on the time axis of the plurality of slices is represented by a presentation time stamp (pts).
17. In the broadcast system supporting a multimedia service based on the Internet protocol, in a content receiving method through a heterogeneous network,

    Receiving at least one package including an MPEG Media Transport (MMT) item;

    Analyzing the package; And

    Processing MMT item and MMT asset included in the package according to the analysis result;

    The MMT item includes content information of MMT assets and configuration of MMT assets.
18. The method of claim 17,

    The package includes at least one of a list of MMT asset, MMT item configuration information, and MMT asset.
19. The method of claim 18,

    The list of MMT assets,

    And at least one of a transmission characteristic, a detailed description, and a slice list of each MMT asset.
20. The method of claim 18,

    Configuration information of the MMT item,

    And information about how to play the MMT asset in at least one of a time and a space of the MMT item.
21. The method of claim 18,

    Configuration information of the MMT item,

    When the MMT item is played on a plurality of devices, the content receiving method comprising information on which asset is played on which of the plurality of devices.
22. The method of claim 18,

    Configuration information of the MMT item,

    And at least one of service configuration information of another package, MMT asset information in the same or another package, and components in the MMT asset in the same or different package.
23. The method of claim 18,

    In the case of general broadcasting, the package is divided using a package id and an MMT item id.

    In the case of live broadcasting, the package is divided into contents using a package id, an MMT item id, and a sequence number.
24. The method of claim 18,

    In the normal mode, one MMT asset is stored as one slice,

    In the trick mode, the one MMT asset is stored as a plurality of slices,

    The time point on the time axis of the plurality of slices is represented by a presentation time stamp (pts).
25. An apparatus for receiving content through a heterogeneous network in a broadcasting system supporting a multimedia service based on an internet protocol,

    A receiving unit for receiving at least one package including an MPEG Media Transport (MMT) item;

    A package analyzer analyzing the package; And

    A processor configured to process an MMT item and an MMT asset included in the package according to the analysis result;

    The MMT item includes content information of MMT assets and configuration of MMT assets.
26. The method of claim 25,

    The package includes at least one of a list of MMT asset, MMT item configuration information, and MMT asset.
27. The method of claim 26,

    The list of MMT assets,

    And at least one of a transmission characteristic, a detailed description, and a slice list of each MMT asset.
28. The method of claim 26,

    Configuration information of the MMT item,

    And information about how to play the MMT asset in at least one of a time and a space of the MMT item.
29. The method of claim 26,

    Configuration information of the MMT item,

    When the MMT item is played on a plurality of devices, the content receiving method comprising information on which asset is played on which of the plurality of devices.
30. The method of claim 26,

    Configuration information of the MMT item,

    And at least one of service configuration information of another package, MMT asset information in the same or another package, and components in the MMT asset in the same or different package.
31. The method of claim 26,

    In the case of general broadcasting, the package is divided using a package id and an MMT item id.

    In the case of live broadcasting, the package is divided into contents using a package id, an MMT item id, and a sequence number.
32. The method of claim 26,

    In the normal mode, one MMT asset is stored as one slice,

    In the trick mode, the one MMT asset is stored as a plurality of slices,

    The time point on the time axis of the plurality of slices is represented by a presentation time stamp (pts).

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