KR20080044968A - Method and apparatus for providing download service in digital video broadcasting system using electronic service guide - Google Patents

Abstract

A download service method using an ESG(Electronic Service Guide) in a digital video broadcasting system and an apparatus therefor are provided to inform that contents, capable of being previously downloaded than a designated schedule, exists through the ESG. An information element indicating a time capable of downloading contents is inserted into a contents fragment(206) corresponding to the contents capable of being previously downloaded. The contents fragment is mapped with a service fragment(202) associated with a corresponding service. ESG data including a schedule event fragment(204) associated with the service fragment and the contents fragment are generated. The ESG data are transmitted to terminals.

Description

TECHNICAL AND APPARATUS FOR PROVIDING DOWNLOAD SERVICE IN DIGITAL VIDEO BROADCASTING SYSTEM USING ELECTRONIC SERVICE GUIDE}

1 is a diagram of a structured data model of an ESG in a typical digital video broadcasting system.

2 is a structured view of a data model of an ESG in accordance with a preferred embodiment of the present invention.

Figure 3 shows the structure and block diagram of a transmitter according to the present invention.

4 shows the structure and block diagram of a receiver according to the invention;

The present invention relates to a digital video broadcasting system, and more particularly, to a method and an apparatus for providing a download service using an electronic service guide (ESG).

The transmission technology for digital broadcasting targets various broadcasting systems such as digital audio broadcasting (DAB), digital video broadcasting (DVB), and digital multimedia broadcasting (DMB). For example, a digital video broadcasting (DVB) system is a European digital broadcasting technology, which is a transmission standard for supporting digital multimedia services not only existing digital broadcasting but also mobile and portable.

In a DVB system, broadcasting data based on a Moving Picture Experts Group-2 (MPEG2) transport stream (TS) and a data stream based on an IP (Internet Protocol) can be multiplexed and simultaneously transmitted. In addition, in the DVB system, various services can be multiplexed and transmitted in one IP stream, and the terminal receives data of the transmitted IP stream and demultiplexes the data back into individual services to demodulate and decode the service, You can output to the screen. At this time, the user needs information on the type of the various services provided in the DVB system and what contents each service includes.

In the DVB system, an electronic service guide (ESG) exists to inform information about each service. ESG data includes time information, related content information, information needed to receive the content, information needed to purchase the content, etc. for a particular service. In the DVB system, a data model is constructed for efficient transmission of the ESG, and the data to be transmitted is determined based on the data model.

1 is a structure of the data model of a typical ESG.

Referring to FIG. 1, each block shown represents a fragment of ESG data. That is, the ESG data model includes the service fragment 102, the schedule event fragment 104, the content fragment 106, the acquisition fragment 108, the service bundle fragment 110, It consists of a purchase fragment 112 and a purchase channel fragment 114.

The service fragment 102 includes a description of the overall service, the schedule event fragment 104 represents the information of the service over time, the acquisition fragment 108 to receive the actual data In order to include the information to know, the service bundle fragment 110 includes information on the case of tying multiple services into one service provision, the purchase fragment 112 to purchase the service bundle Price information, and the purchase channel fragment informs information about a system to be used to acquire a right for the purchase.

Each fragment of the data model may refer to another fragment and arrows between blocks indicate a reference relationship. The reference refers to information associated with each fragment using information transmitted from another fragment. That is, when one service is composed of several contents, the service fragment 102 includes only the description of the entire service, for example, the name of the service, the language of the service, and the like. A description of the content itself refers to the content fragment 106 of the corresponding content. In addition, various pieces of information necessary for the terminal to receive the service, for example, session information used in a transmitted protocol, are received and decoded by the acquisition fragment 108 referenced by the service fragment 102. Can be obtained.

The ID of each fragment is a major parameter indicating connectivity with other fragments in a reference relationship. For example, when the service fragment 102 refers to specific content, the service fragment 102 includes an ID of the content fragment 106 to which the service fragment 102 refers.

In the digital broadcasting system configured as described above, when a media file related to a service can be provided to a terminal through a download service, the terminal needs to acquire information necessary for downloading the media file. Therefore, in the conventional digital broadcasting system, a technology for providing a terminal with information necessary for a download service through an ESG data model is required.

The present invention provides a method and apparatus for notifying by using an electronic service guide that there is content that can be downloaded in advance in a digital video broadcasting system.

According to a preferred embodiment of the present invention, in a method for supporting a download service through an electronic service guide (ESG) in a digital broadcasting system,

Inserting an information element indicating a time at which the content can be downloaded into a content fragment corresponding to a pre-downloadable content;

Mapping the content fragment with a service fragment related to the service, generating at least one schedule event fragment related to the service fragment and ESG data including the content fragment;

And transmitting the ESG data to terminals.

According to a preferred embodiment of the present invention, in a method for supporting a download service through an electronic service guide (ESG) in a digital broadcasting system,

Receiving ESG data including a service fragment, at least one schedule event fragment mapped to the service fragment, and at least one content fragment;

Detecting an information element of the at least one content fragment of the ESG data, the information element representing a time at which the content can be downloaded from a content fragment corresponding to a downloadable content before the start of a service;

And downloading the contents with reference to the information element at the request of the user.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that they may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The main subject of the present invention to be described later is to provide a data structure of the ESG for providing the terminal with information on when the specific content can be downloaded, through the content fragment of the electronic service guide.

In the Convergence of Broadcasting and Mobile Service (DVB-CBMS) Phase I ESG data model according to the European Telecommunications Standards Institute (ETSI) spec TS102 471, which is a standard of DVB systems, one service fragment is mapped to one schedule event fragment. This means that one service is provided in one schedule event. In addition, the schedule event fragment and the service fragment are mapped to a plurality of content fragments, which means that a service is composed of a plurality of contents, and that these contents are provided in the same schedule event.

For example, when a service is composed of one TV program and a media file associated with it, a schedule event in the media file means a time at which the terminal can download the media file. In order to reduce the burden on the terminal operation or to reduce the burden on the service provider when a large number of terminals access the file at the same time, the terminal may support downloading the specific file in advance than the schedule for the service. have. In a preferred embodiment of the present invention, the terminal can download a specific desired content before a predetermined schedule through extension of the ESG data model.

The preferred ESG data of the present invention includes an information element (IE) for notifying when the content can be downloaded in advance in the content fragment corresponding to the content that can be downloaded in advance by the terminal. Tables 1 and 2 below show the syntax and semantics of content fragments defined in the ESG data model of DVB-CBMS Phase I.

Content Fragment Syntax <complexType name = "ContentType"> <sequence> <element name = "Title" type = "mpeg7: TitleType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = "MediaTitle" type = "mpeg7: TitleMediaType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" ServiceRef "type =" esg: ESGIDRefType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" Synopsis "type =" tva : SynopsisType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" Keyword "type =" tva: KeywordType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" Genre "type = "tva: GenreType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = "ContentType" type = "tva: ControlledTermType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = "ParentalGuidance" type = "mpeg7: ParentalGuidanceType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = "Language" type = "mpeg7: ExtendedLanguageType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = " CaptionLanguage "type =" tva: CaptionLanguageType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" S ignLanguage "type =" tva: SignLanguageType "minOccurs =" 0 "maxOccurs =" unbounded "/> <element name =" CreditsList "type =" tva: CreditsListType "minOccurs =" 0 "/> <element name =" RelatedMaterial "type = "esg: RelatedMaterialType" minOccurs = "0" maxOccurs = "unbounded" /> <element name = "Duration" type = "duration" minOccurs = "0" /> <element name = "PrivateData" type = "esg: PrivateDataType "minOccurs =" 0 "maxOccurs =" unbounded "/> </ sequence> <attribute name =" contentID "type =" anyURI "use =" required "/> </ complexType>

Content Fragment Semantics Field Semantics Title Specifies the title assigned to the described content. The title may be associated to a language. MediaTitle Specifies the reference to media representing the title of the described content. Note: This can take the form of a reference to an image or a sound available externally to the metadata, or the media data can be provided inline. Serviceref Specifies the ServiceId of the Service Fragment to which the described content is associated to. Synopsis Specifies a short, textual summary of the described content. The language of the description is specified by the lang attribute Keyword Specifies Keywords characterizing the described content. Genre Specifies a genre that characterizes the genre of the described content. ContentType Specifies the characteristic of the content e.g. if the content is download content, streaming content or a combination of both. If this element is present it overwrites the information specified in the field ServiceType in the ServiceFragment. If it is not present, the ContentType is inherited from the field ServiceType in the Service Fragment this Content belongs to. Parental Guidance Specifies the parental rating of the described content. This element can be associated to a region. Language Specifies a language of the described content. Note: The language specification in the Content Fragment is seen to be user attracting data which can be displayed even if the related Acquisition Fragment is not available. However it is understood that the language specification in the Acquisition Fragment is more precise with respect to the components of the content. Captionlanguage Specifies a caption language of the described content. Note: The caption language specification in the Content Fragment is seen to be user attracting data which can be displayed even if the related Acquisition Fragment is not available. However it is understood that the language specification in the Acquisition Fragment is more precise with respect to the components of the content. SignLanguage Specifies a sign language of the described content. Note: The sign language specification in the Content Fragment is seen to be user attracting data which can be displayed even if the related Acquisition Fragment is not available. However it is understood that the language specification in the Acquisition Fragment is more precise with respect to the components of the content. CreditsList The list of credits (e.g. actors, directors, etc.) for the content. RelatedMaterial Specifies reference to material related to the described content. For instance, a related material associated to an AV program may be a web site URL that provides more information about the AV program. Duration Specifies the duration of the described content. Note: The duration specifies in the Content Fragment differs from the duration which can be derived from the Schedule Event Fragment in that the first describes the duration of the content and the latter the time period in which it is available .. PrivateData Generic element instantiated to add private data. This is used e.g. for fields of specific content such as a rights objects. contentID Specifies a unique Identifier of the instantiated Content Fragment. For the scope of uniqueness see the semantics of serviceID in section 5.4.2

In a preferred embodiment of the present invention, a new element such as one of the following Tables 3a to 3c is added to the ESG data models of Tables 1 and 2. Tables 3a to 3c include "In-advanceDownload", which is an element indicating a time that can be downloaded in advance. Table 3a uses "duration" defined in MPEG7 as the data type of the element. "duration" is a data type defined in MPEG7 to indicate a specific period and can be used when the downloadable time is limited. In Table 3b, "dateTime" defined in MPEG7 is used as the data type of the element. The "dateTime" means that the corresponding content can be downloaded from a specific date and time. Table 3c newly defines the data type of the element for the CBMS ESG model. The element is composed of "In-advanceDownloadStartTime" and "In-advanceDownloadEndTime", and "In-advanceDownloadStartTime" downloads the corresponding content. "In-advanceDownloadEndTime" indicates a start time that can be received, and "dateTime" of MPEG7 indicates a period during which the corresponding content can be downloaded. Specific xml grammars and types in the embodiments of Tables 3a, 3b, and 3c below may be replaced using other types or grammars that play the same role.

<element name = "In-advanceDownload" type = "duration" minOccurs = "0" />

<element name = "In-advanceDownload" type = "dateTime" minOccurs = "0" />

<element name = "In-advanceDownload" type = "esg: In-advanceDownloadType" minOccurs = "0" /> <complexType name = "In-advanceDownloadType"> <sequence> <element name = "In-advanceDownloadStartTime" type = " dateTime "/> <element name =" In-advanceDownloadEndTime "type =" dateTime "/> </ sequence> </ complexType>

If each TV program is organized at different times, it is sufficient to only map one schedule event to one service. However, if one service consists of multiple streaming services and one file, or one streaming service and multiple files, or one service consists only of multiple files, Multiple contents need to be mapped for one service. In the case of a file service, the terminal may download the file at any point during the corresponding schedule, so that an accurate schedule for the file service is less important than a streaming service. Therefore, when there is a content (eg, a file) that the terminal can download in advance, the schedule for the content needs to be defined differently from other streaming content. Accordingly, in the preferred embodiment of the present invention, as shown in FIG. 2, an ESG data model is proposed so that one service can refer to and map a plurality of contents.

Referring to FIG. 2, the ESG data model includes a service fragment 202, one or more scheduled event fragments 204, one or more content fragments 206, and an acquisition fragment 208. , The service bundle fragment 210, the purchase fragment 212, the purchase channel fragment 214. Here, a plurality of schedule event fragments 204 may be mapped to one service fragment 202. Thus, one service may be provided to the terminal according to a plurality of different schedule events.

When an entry point for accessing each fragment of the ESG data model is called a service fragment 202 or a schedule event fragment 204, different schedule events may refer to the same service. One of the content fragments 206 mapped to the service fragment 202 may be related to specific content that the terminal may download in advance, for example, before a predetermined schedule of the corresponding service, regardless of the schedule of the corresponding service. In this case, the content fragment includes an information element for the downloadable time of the content.

3 is a view schematically showing the structure of a transmitter according to a preferred embodiment of the present invention.

Referring to FIG. 3, a plurality of MPEG 2 streams 302, which are TV streams, are input to the DVB transmitter 300, and data IP including a plurality of IP streams, that is, IP-based service data, in addition to the TV streams. Streams 304 and ESG IP streams 306 are input to DVB IP encapsulator 308. The ESG IP streams 306 are generated by the ESG data encoder 320 and are configured according to the above-described embodiment, and display the content fragment and the content fragment representing the content that can be downloaded in advance for one service fragment. Includes a scheduled event fragment that indicates the time that can be downloaded.

In detail, the ESG data encoder 320 collects ESG information, and if the ESG information is related to content that can be downloaded in advance in relation to one service, the content fragment corresponding to the content is previously previewed at some point in time. An information element indicating whether it can be downloaded is inserted, for example, "In-advanceDownload", and the ESG data is generated by mapping the content fragment to a service fragment.

The input IP streams 304, 306 are encapsulated in a DVB IP encapsulator 308 into an MPEG 2 transport stream (TS), and are multiplexed by the multiplexer 310 with MPEG 2 TV streams 302. Multiplexed together. The multiplexed TS is modulated into an OFDM symbol in the DVB modulator 312 and transmitted through the antenna 314.

4 is a diagram schematically illustrating a structure of a receiver according to a preferred embodiment of the present invention.

Referring to FIG. 4, the DVB receiver 400 receives a signal through the antenna 402, and the received signal undergoes OFDM demodulation in the DVB demodulator 304. Data output from the DVB demodulator 304 is separated by the demultiplexer 306 into encapsulated IP streams and MPEG 2 TS packets 412. The TS packets 412 go through a series of processing such as MPEG decoding, which is necessary for the data processing unit 414 to show a corresponding service to a user. Encapsulated IP streams are recovered to IP streams 410 in IP decapsulator 408 and the IP streams 410 are divided into ESG IP streams and data IP streams. The data IP stream is input to the data processor 414 in the same manner as the TS packets 412. The ESG IP streams are input to the ESG processor 416.

The ESG processing unit 416 analyzes each fragment of the ESG data included in the ESG IP streams, and outputs such that the user can recognize it through the ESG standard browser of the user interface 418 when the user requests it. Is stored in memory. When there are a plurality of contents and a plurality of schedule events mapped to one service in the ESG data, and one of the contents is a file that can be downloaded in advance before a predetermined schedule of the corresponding service, the DVB receiver 400 Downloads the file at some point during the time interval indicated by the content fragment associated with the file at the request of the user, for example, at the time indicated by "In-advanceDownload", and the user via the user interface 418. To provide.

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.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention can provide various services by mapping a plurality of contents and a plurality of schedule events to a single service so that the terminal can recognize when a desired content can be downloaded in advance.

Claims (4)

In a method for supporting a download service through an electronic service guide (ESG) in a digital broadcasting system, Inserting an information element indicating a time at which the content can be downloaded into the content fragment corresponding to the pre-downloadable content; Mapping the content fragment with a service fragment related to a corresponding service, generating a schedule event fragment related to the service fragment, and ESG data including the content fragment; Download service method comprising the step of transmitting the ESG data to the terminal. The method of claim 1, wherein the information element, And at least one of a combination of "duration" defined in MPEG7, "dateTime", and a start time and a period in which the content can be downloaded. In a method for supporting a download service through an electronic service guide (ESG) in a digital broadcasting system, Receiving ESG data including a service fragment, at least one schedule event fragment mapped to the service fragment, and at least one content fragment; Detecting an information element of the at least one content fragment of the ESG data, the information element representing a time at which the content can be downloaded from a content fragment corresponding to a downloadable content before the start of a service; And downloading the contents with reference to the information element when a user request is made. The method of claim 3, wherein the information element, And at least one of a combination of "duration" defined in MPEG7, "dateTime", and a start time and a period in which the content can be downloaded.

Images