KR20080029334A - Iptv service system for providing distance learning contents and method thereof - Google Patents

Abstract

An IPTV(Internet Protocol Television) service system for providing E-learning contents and a transceiving method thereof are provided to watch broadcasting signals from an IPTV high end system and offer an interactive data broadcasting service from a T-learning system to provide an interactive T-learning service through a RS system. A baseband system(100) performs the frame synchronization of broadcasting signals received from a PP(Program Provider) or terrestrial waves and distributes broadcasting signals to each channel, and outputs broadcasting video and audio signals. A data broadcasting system performs the composition, authentication, and transmission of data for data broadcasting. An EPG(Electronic Program Guide) providing system provides EPG information including an E-learning service menu to a UE(User Equipment). A compressing/multiplexing system(110) compresses and streams the broadcasting video and audio signals received from the baseband system by channel, multiplexes the streamed broadcasting video and audio signals with the data for data broadcasting and the EPG information, and performs the IP(Internet Protocol) packetizing of the multiplexed stream and outputs the IP-packetized multiplexed stream. An MOC(Media Operation Core System) system manages the program scheduling information of the PP or the terrestrial waves, the metadata management information of E-learning contents, and the contract information of an E-learning CP(Contents Provider). An E-learning system provides the E-learning contents for a T-learning service to plural UE(User Equipment). A network switch system transmits IP(Internet Protocol)-packetized signals received from the compressing/multiplexing system to the plural UE through an IP network in a multicast method. A RS(Return Server) system is connected to the plural UEs through the IP network and a return channel and receives interactive data from the plural UE in a unicast method for interactive E-learning service.

Description

IPTV service system for providing distance education content and method for transmitting and receiving thereof {IPTV service system for providing distance learning contents and method}

1 is a block diagram of an IPTV service system for providing distance education content.

2 is a block diagram of the entire IPTV service system for providing distance education content for terrestrial broadcasting according to the present invention.

3 is a view for explaining a baseband system of the IPTV service system of FIG.

4 is a view for explaining a compression multiplexing system of the IPTV service system of FIG.

FIG. 5 is a diagram for describing a reception restriction system of the IPTV service system of FIG. 2. FIG.

FIG. 6 is a diagram for describing a media management system (MOC) of the IPTV service system of FIG. 2. FIG.

7 is a view for explaining the protocol of the four layers of the IP set-top box (IP STB).

8 is a diagram illustrating a T-learning service menu configuration in IPTV according to an embodiment of the present invention.

9 is a diagram illustrating a T-learning service screen via IPTV according to an embodiment of the present invention.

10 is a configuration diagram of a T-learning system according to an embodiment of the present invention.

FIG. 11 is a diagram for explaining a pitcher-catcher management system. FIG.

12 illustrates PIM-SM multicast routing in an L3 network layer.

FIG. 13 illustrates Static Join to reduce channel zapping time in a subscriber IP set top box. FIG.

14 is a flowchart illustrating a method for transmitting distance education content in an IPTV service system according to an embodiment of the present invention.

15 is a flowchart illustrating a method for receiving distance education content in an IP set-top box of a subscriber according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: baseband system 110: compression multiplexing system

120: restricted access system 130: back office system

140: subscriber management system 150: monitoring system

160: media management system (MOC) 170: network switch system

190: T-learning system 191: EPG system

192: data broadcasting system 193: return server system

200: premium network 210: internet network

201: Multicast Supported Router 211: Unicast Supported Router

220: subscriber concentrator 230: subscriber switch

300: TV 310: IP Set Top Box (IP STB)

The present invention relates to an IPTV service system and method, and more particularly, to broadcast to a tuned channel of a TV connected to an IP set-top box (STB) from an IPTV headend system via a high-speed Internet network based on the terrestrial Advanced Common Application Platform (ACAP) standard. IPTV service that provides distance education content while watching signals, providing distance education content to provide interactive T-learning services by providing video learning, interactive quiz learning, flash learning games, and learning data through TV. A system and a method of transmitting and receiving the same.

In general, Internet Protocol Television (IPTV) is a type of digital convergence that combines broadcasting and communication with a broadcast program provider or a broadcast signal received from a terrestrial, cable, or satellite. In addition, a TV receiver (TV) connected to an IP Set Top Box (STB) provides Internet Contents On Demand (ICOD) services such as TV Internet content and video content (T-VOD) through an IP network. to provide.

The main components of the IPTV service system include the IPTV Headend system, the IP backbone network, the IP backbone, the access network (e.g. xDSL, HFC, FTTC, FTTH structure), and subscriber terminals (IP STB, TV). do.

In order to use terrestrial IPTV, a TV program connected to an IP set-top box (STB) connected to an Internet line connected to a high-speed Internet network, and a program desired by an electronic program guide (EPG) using a remote control or a key input of the TV. After selecting the user authentication, you can watch broadcasts such as movies, dramas, news and sports, search internet information of TV-content, watch movies by T-VoD, home shopping by T-Commerce, home banking, online games, and listen to MP3 music. It uses a two-way TV application service that is a converged communication and broadcast, including various Internet content and additional services.

 The IPTV service is a broadband broadband service that provides two-way TV content in the form of convergence of communication and broadcasting according to the digital convergence of the program provider (PP) and the content provider (CP) of the Internet market. Provides Internet multimedia contents including broadcasting video, audio, and packet data to a TV connected to an IP set-top box (STB) through an internet network, and is an interactive IPTV using a two-way communication channel as a return path concept. Provide service.

TV (TV) terminal connected to IP set-top box (STB) equipped with middleware protocol for IPTV service is a convergence service in the era of digital convergence (VoIP), high-speed Internet (Internet), and IPTV service (broadcasting). Triple Play Service (TPS), which includes IPTV), and SD / HD-level ICOD (Internet Contents) through a next-generation network that requires broadband bandwidth from IPTV headend systems to premium services. On Demand) to receive broadcast and Internet content.

The standardization of IPTV's Data Broadcasting is the use of terrestrial data broadcasting by the Digital Video Broadcasting-Multimedia Home Platform (DVB-MHP) of satellite data broadcasting at the European Telecommunication Standards Institute (ETSI) in Europe and the Advanced Television System Committee (ATSC) of the United States. ACAP (Advanced Common Application Platform), SCTE (Society of Cable Television Engineers) are pushing for standardization of data broadcasting for cable TV's OCAP (Open Cable Application Platform), and Java in IP set-top box (STB) JAVA) technology to provide two-way IPTV service.

ACAP (Advanced Common Application Platform) is a terrestrial data broadcasting standard. It provides two-way data broadcasting service to TV by installing ACAP middleware for terrestrial data broadcasting in HD set-top box (STB).

Conventional distance learning (e-learning) system is a lecture video, voice, image, animation, learning data made mostly by the authoring tool (Authoring Tool) of early childhood, elementary, middle, high school, college lecture materials VOD video and learning data for distance learning (HTML document, PPT) by storing multimedia learning materials including a remote learning server and VOD server, and streaming to a distance learning web or e-learning client. It is used for internet education by providing PDF materials.

However, a conventional television (TV) receives a broadcast signal transmitted from a terrestrial TV broadcasting system in one direction, and receives a broadcast signal through a broadcast channel tuned from an IPTV, and at the same time, provides interactive interactive education of high quality. There was a problem that the T-learning service was not provided.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is to connect a television set connected to an IP set-top box (STB) through an high-speed Internet network from an IPTV headend system based on the ACAP (Advanced Common Application Platform) standard. Simultaneously watch the broadcast signal through the tuned broadcasting channel of (TV) and access the T-learning system to receive distance education content and early childhood education content through the web or T-learning client of IPTV. To provide an interactive T-learning service including distance learning video learning, interactive quiz learning, flash learning games, learning question / answer, and learning evaluation management, and to provide an IPTV service system that provides distance education content and a method of transmitting and receiving the same. will be.

In order to achieve the object of the present invention, the IPTV service system providing the distance education content according to the present invention, the frame synchronization of the broadcast signal received from the program provider (PP) or terrestrial wave, and distributes the broadcast signals for each channel to broadcast A baseband system for outputting video and audio signals; A data broadcasting system for authoring, verifying, organizing, and transmitting data for data broadcasting; An EPG providing system for providing an electronic program guide (EPG) including a distance education service menu to a user terminal; Compress and stream the broadcast video and audio signals received from the baseband system for each channel, and multiplex the streamed broadcast video and audio signals with the data broadcast data and EPG information, and then multiplex the streams with the IP packets. Compression multiplexing system for outputting video; A media management system (MOC) for managing program organization or program information of terrestrial, metadata management information of distance education content, and contract information of distance education content provider (CP); A distance learning system for providing distance education contents for a two-way distance learning (T-learning) service to a plurality of user terminals; A network switch system for transmitting the IP packetized signal received from the compression multiplexing system to a user terminal through an IP network in a multicast manner; And a return server (RS) system connected to the user terminal through the IP network through a return channel and receiving bidirectional data from the user terminal in an unicasting manner for interactive distance education services.

Preferably, the IPTV service system for providing distance education content according to the present invention receives an authentication request message for use of the distance education service from the user's terminal through a return server (RS) system, and for the authentication request message In response to the authentication ticket (Ticket) is transmitted to the user terminal through the return server (RS) system, and further comprises a personalized authentication server for transmitting information about the ticket to the distance learning system.

The distance education system, T-learning service subscriber management module for managing the subscriber of the T-learning service; An authentication ticket confirmation module for receiving information on a ticket transmitted from the personalization authentication server and identifying a subscriber who is using a distance learning service by receiving a ticket transmitted from the user terminal; And a learning management system (LMS) having a learning evaluation management module for managing learning evaluation results of each subscriber for the T-learning service.

The distance learning system further includes one or more contents on demand (COD) servers for providing distance learning contents for a T-learning service to the user terminal, and the media management system includes a delivery server of a distance learning contents provider. A service uploading server for receiving distance education content from a service, a content database for storing distance education content received through the service uploading server, and a distance education content stored in the content database to a COD server of the distance education system. It further includes a transaction server for transmitting.

The two or more COD servers are distributed in various regions, and the transaction server of the media management system transmits the distance learning contents to each COD server in a multicasting manner.

The distance learning content (T-learning content), characterized in that to provide distance education content, including education content for infants, elementary and middle school, college, lifelong education, and language.

The distance learning content (T-learning content) is characterized in that the multimedia learning data including distance learning video / audio data, and documentary data.

The compression multiplexing system is characterized by multiplexing the streamed broadcast video and audio signal, the data broadcasting data, and the EPG information according to an ACAP (Advanced Common Application Platform) data broadcasting standard.

The compression multiplexing system is characterized in that the broadcast video and audio signals, the data broadcasting data, and the EPG information are streamed by the MPEG2 TS method.

The baseband system may further include a function of inserting at least one of an advertisement, a logo, and a subtitle into the broadcast video and audio signal.

The network switch system comprises: at least one L3 switch (L3 SW) for transmitting the IP packetized signal to an IP network by multicasting; At least one L4 switch (L4 SW) for connecting the return server system and the subscriber station and load balancing the bidirectional data reception traffic in a unicast manner by dividing the load with a suitable load; And at least one intrusion prevention system for blocking harmful traffic between the L4 switch and the IP network.

Preferably, the IPTV service system for providing distance education content according to the present invention is characterized in that it further comprises a subscriber management system for subscription and termination for IPTV service, member information management.

Preferably, the IPTV service system for providing distance education content according to the present invention is characterized in that it further comprises a back office (Back Office) system for billing processing for the use of the T-learning service for each subscriber.

The user terminal may include an IP set-top box, a computer, a laptop, and a personal portable terminal connected to the TV or the user's TV.

The user terminal includes a hardware layer consisting of a CPU, a media processor, a flash RAM, and hardware of an Ethernet module, a system software layer including a device driver and an operating system, a Java virtual machine (JVM), a reception restriction system (CAS), and digital rights management. (DRM) interface module, middleware layer with streaming protocols (RTP, RTSP), electronic program guide (EPG) to select IPTV service channels including distance education services, Web browser for distance education or T-learning The application layer includes a client and supports various multi-codecs.

The multi-codec includes an MPEG2, MPEG4, MPEG7, H.264, WMV-9 codec.

The L3 network equipment used for the IP network uses a Protocol Independent Multicast-Sparse Mode (PIM-SM) multicast routing protocol, and the subscriber station uses an IGMP Join / Leave message to select / release a broadcast channel. L2 network equipment of the subscriber network connecting the IP network and the user terminal is characterized in that using the IGMP Snooping protocol to recognize the IGMP transmission and reception messages of the terminal of the subscriber making a channel request.

In order to achieve another object of the present invention, the method for transmitting the distance education content in the IPTV service system according to the present invention, (a) the baseband system frame-synchronizes the broadcast signal received from the program provider (PP) or terrestrial Distributing broadcast signals to output broadcast video and audio signals; (b) the compression multiplexing system compresses and streams the broadcast video and audio signals received for each channel, and multiplexes the streamed broadcast video and audio signals with EPG information including data broadcasting data and a distance education service menu. IP packetizing the multiplexed stream; (c) the network system transmitting the received IP packetized transport stream to the plurality of user terminals in a multicasting manner via the IP network; And (d) receiving a request message for providing distance education content from the user terminal through the return server system and providing the corresponding distance education content to the user terminal in a unicasting manner.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention receives an authentication request message for the T-learning service from the user terminal to the personalization authentication server via the return server (RS) system, The method may further include transmitting a corresponding ticket to the user terminal through the return server system.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention receives the information about the ticket transmitted from the personalization authentication server, receives the ticket transmitted from the user terminal to use the distance education service It further comprises the step of identifying the subscriber.

The step (d) may include: (d-1) when the authentication is confirmed, the media management system (MOC) transmitting URL information of a COD server to the user terminal through the return server (RS) system; And (d-2) the COD server receiving a request for providing distance education content from the user terminal and providing a corresponding distance education content to the user terminal.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention, the service uploading server of the media management system (MOC) receives the new distance education content from the transmission server of the content provider (CP) and the content data And storing the data in a base and transmitting the data to the COD server through a transaction server.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention is directed to the distance management content (MOC) from the transmission server of the content provider (CP) to the education management system (LMS). And receiving the transmission result, updating the EPG information related to the distance learning service, and providing the result to the compression multiplexing system.

The step (a) further includes a function of inserting at least one of an advertisement, a logo, or a subtitle into the broadcast video and audio signal.

In the step (b), the broadcast video and audio signal, the data broadcasting data, and the EPG information are multiplexed according to a terrestrial Advanced ACAP (Advanced Common Application Platform) data broadcasting standard.

In the step (b), the broadcast video and audio signal, data broadcasting data, and EPG information are streamed by the MPEG-2 TS method.

In the step (b), the broadcast video and audio signals are encrypted (scrambled) and then IP packets are transmitted to the network.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention is characterized in that it further comprises a subscriber management step of managing the subscription and termination, the member information for the distance education service.

Preferably, the method for transmitting the distance education content in the IPTV service system according to the present invention further includes a billing processing step for the use of the T-learning service for each subscriber.

In order to achieve another object of the present invention, the method for receiving the distance education content in the IPTV service system according to the present invention, (a) if the T-learning service portal menu is selected using an electronic program guide (EPG), Transmitting an authentication request message for using a T-learning service to a personalization authentication server; (b) receiving an authentication ticket from a personalization authentication server via a return server (RS) system; (c) checking whether to subscribe to the service based on the received authentication ticket, and activating a corresponding menu item of the T-learning service if the service is subscribed; (d) transmitting a provision request message for the distance learning content selected by the user to the media management system; (e) receiving URL information of a COD server storing distance learning contents from a media management system (MOC) through a return server (RS) system; (f) transmitting ticket information to an education management system (LMS); And (g) a distance education web browser or a T-learning client accessing the COD server to receive distance education content.

The step (c) further includes the step of checking whether to subscribe to the service based on the received authentication ticket, and activating only the taste menu item of the T-learning service if not subscribed to the service.

Preferably, the method for receiving the distance learning content in the IPTV service system according to the present invention further comprises the step of transmitting and receiving interactive learning data by accessing the distance learning system through the return server (RS) system through the Internet network. Include.

Preferably, the method for receiving distance education content in the IPTV service system according to the present invention further includes receiving a result of distance education learning evaluation from the distance education system.

In order to achieve another object of the present invention, the present invention provides a computer or an IP set-top box (IP STB) or personal portable terminal, when (a) T-learning service portal menu is selected using an electronic program guide (EPG). Transmitting, to the personalization authentication server, an authentication request message for using the T-learning service; (b) receiving an authentication ticket from the personalization authentication server via a return server (RS) system; (c) Check whether the service is subscribed based on the received authentication ticket, and activate the corresponding menu item of the T-learning service if it is subscribed to the service. Activating function; (d) transmitting a provision request message for the distance learning content selected by the user to the media management system; (e) a function of receiving URL information of a COD server storing distance learning contents from a media management system (MOC) through a return server (RS) system; (f) transmitting ticket information to an education management system (LMS); And (g) a recording medium readable by a computer or an IP set-top box (STB) that has recorded a program for realizing the function of the remote education web browser or T-learning client connecting to the COD server and receiving the distance education content. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an IPTV service system for providing distance education content.

The IPTV service system is an IPTV head for transmitting IPTV broadcast video and audio signals, data broadcast data, and EPG information (PSI / SI information) from a program provider (PP) / terrestrial or IP-TV content provider (CP) T-learning system. End systems, IP backbones that provide unicasting and multicast routing protocols to IP networks, subscriber networks (e.g. Ethernet, xDSL, HFC, FTTC, FTTH), IP set-top It consists of a user terminal including a TV connected to the box STB.

The subscriber network may be composed of any one of Ethernet, xDSL (ADSL, VDSL), Hybrid Fiber Coaxial Ca (HFC), Fiber To The Curb (FTTC), and Fiber To The Home (FTTH) structures.

The user terminal may use any one of a TV with an IP set-top box or an IP set-top box, a computer, a laptop, or a personal portable terminal connected to the user's TV.

2 is a block diagram of the entire IPTV service system for providing terrestrial broadcasting distance education content according to the present invention.

The IPTV headend system includes a baseband system 100, a compression multiplexing system 110, a reception restriction system 120, a back office system 130, a subscriber management system 140, a monitoring system 150, a media management system ( MOC: Media Operation Core (160), network switch system 170, T-learning system 190, EPG system 191, data broadcasting system 192, and return server (RS) system 193 do.

The IPTV headend system includes a subscriber concentrator 220 and a subscriber switch 230 via a router 201 that supports a high-speed (Gigabit or higher) multicast routing protocol (eg, PIM-SM) of the IP premium network 200. Multicasting EPG information (PSIP / PSI / SI information) including broadcast video and audio signals, data for broadcasting data, and distance education service menus to IP set-top boxes (IP STBs) 310 of multiple subscribers. send.

When the user terminal is authenticated according to ID / Passwd in the T-learning service menu provided in the electronic program guide (EPG), the subscriber station remotely for the T-learning service from the T-learning system 190 to unicasting. Receive educational multimedia data (video / audio, learning data, learning flash, animation data, images, etc.).

FIG. 3 is a diagram for describing a baseband system of the IPTV service system of FIG. 2.

The baseband system 100 receives an MPEG2 broadcast signal from an external program provider (PP) or an analog broadcast signal from terrestrial waves, converts the received source broadcast signal into a SDI signal, and converts the frame ( Frame), and distributes the video and audio signals of various broadcast channels (e.g. 100 channels) through a routine switcher, and to the subtitle generator (CG) and automatic program controller (APC). By inserting at least one of an advertisement, a logo, or a subtitle to the broadcast video and audio signal (signal editing and processing) is transmitted to the compression multiplexing system 110.

The SDI (Serial Digital Interface) signal is a digital signal standard having a transmission rate of 270 Mbps, and a composite digital video and four channels of digital audio signals are mixed.

The baseband system 100 is basically a tuner for receiving an analog broadcast signal such as a program provider (PP), a terrestrial wave, and the like using a DS-3 optical end station, a Yagi antenna, and an IRD, respectively, a received original source. ) Signal splitter such as Frame Synchronizer for converting and correcting signals into SDI signals and synchronizing frames, and A / V routers for connecting and centralizing all broadcast signal channels for operation management, and advertising the SDI signals. , A subtitle generator for inserting a logo, subtitles, and editing and processing the signal.

FIG. 4 is a diagram for describing a compression multiplexing system of the IPTV service system of FIG. 2.

The compression multiplexing system 110 converts a broadcast video and audio signal received from the baseband system 100 into an A / V encoder for each broadcast channel (eg, 100 channels). Compresses SDI (Serial Digital Interface) video signals into H.264, compresses audio signals to MPEG-2 AAC, generates MPEG-2 Transport Stream (TS), and compresses broadcast video and audio to MPEG-2. After multiplexing data broadcasting data and EPG information (PSIP / PSI / SI information) generated by a data encoder and a PSI / SI generator together with the TS signal, the multiplexed MPEG -2 TS signal is transmitted to the scrambler and encrypted by IP scrambler, IP packetized and finally IP packetized TS (Transport Stream) broadcast signal through the network switch system 170 IP multicasting Gigabit leased line Through the IP premium network 200 is sent.

When using the IPv4 multicasting, the network switch system 170 multicasts the IP packetized transport stream on the basis of a Class D IP multicast address to the subscriber terminal (IP) through the IP premium network 200. STB).

The network switch system 170 is one or more L3 switch (L3 SW) for transmitting the IP packetized signal to the IP network by multicasting, connecting the return server system and the subscriber station and a unicast scheme between them And at least one L4 switch (L4 SW) for load balancing bidirectional data reception traffic divided into appropriate loads, and at least one intrusion prevention system for blocking harmful traffic between the L4 switch and the IP network.

In addition, IP multicasting may use IPv4 multicasting or IPv6 multicasting techniques.

In one embodiment, when the network switch system 170 uses IPv4 multicasting, the IPv4 multicast address is 224.0.0.1 to 239.255.255.255, which is different for each broadcast channel (eg, 100 channels). Use an address. In one embodiment, when using IPv4 multicasting, SBS uses a 224.1.1.1 multicast address, KBS uses a 224.1.1.2 multicast address, and EBS uses a 224.1.1.3 multicast address as a broadcast channel. do.

Optionally, the reception restriction system 120 can be used to prevent illegal viewing and illegal copying of the T-learning content.

FIG. 5 is a diagram for describing a reception restriction system of the IPTV service system of FIG. 2.

The conditional access system (CAS) 120 is a viewer's viewing authority control system that performs encryption of broadcast video and audio signals for real-time channels and pre-encryption of VOD contents, and performs viewing authority for digital pay broadcasting. By providing the control, the channel and T-learning content are provided to the authenticated user only.

The reception restriction system 120 selectively broadcasts video and audio according to a control word (CW) which is a key value for scrambled by the scrambler to prevent illegal viewing and illegal mass duplication before and after multiplexing. The scrambled signal and VOD content provide encrypted content information (ECM: Entitlement Control Message) and encrypted subscriber information (EMM: Entitlement Management Message).

The reception restriction system 120 provides a function of controlling the viewing authority according to the viewing grade and controlling and allowing the service for a specific local subscriber or a specific subscriber group, and encrypts the real-time broadcasting video and audio signal of the pay broadcasting service. In addition, smart card-based decoding (Descrambling) is provided.

The IP set-top box (STB) 310 receives an encrypted content information (ECM) and an encrypted subscriber information (EMM) together with broadcast video and audio signals, data broadcasting data, and EPG information through a high-speed Internet network. After demultiplexing, the service purchased by the subscriber through the encrypted subscriber information (EMM) of a smart card embedded with a microchip containing the encrypted subscriber information (EMM) When the service subscription is confirmed, the control word CW is extracted from the ECM information, and the descrambler broadcast video, audio signal and VOD content are descrambled by the descrambler using the control word CW, and the broadcast video. The audio signal and the VOD content are decoded and output on the TV screen.

The CA 120 includes an ECM generator (ECMG), an EMM generator (EMMG), and a reportback server.

The ECM generator generates the encrypted content information (ECM) by interworking with the SimulCrypt Synchronizer (SCS) of the IP multiplexer using CA schedule information. In order to generate an ECM suitable for each broadcast event or service, information referred to as an access criterion (AC) must be provided to the ECM generator (ECMG), and these access criteria (AC) are changed according to a schedule.

A schedule is used to generate access criteria (AC) associated with each Conditional Access (CA) event, and these access criteria (AC) are stored in a database in the form of a CA schedule, and the ECM generator ( ECMG) generates encrypted content information (ECM) using access criteria / control words (AC / CW).

The EMM generator (EMMG) serves as an interface between the subscriber management system 140, the back office provisioning system (PVS) 130, and the subscriber set top box (STB). Subscriber-related commands are received from the back office system (PVS) 130 and an authentication stream is generated and sent to the smart card (or verifier) using multicasting in a secure form.

The EMM generator (EMMG) prepares an encrypted Entitlement Mangement Message (EMM) packet according to a specific request from the subscriber management system 140 and transmits the packet to the subscriber's IP set-top box 310. These packets provide features such as approval to view the service or credit for purchasing an Impulse Pay Per View (IPPV), broadcast mail (B-mail) and on-screen messages (OSD), service cancellation or reapply, and subscriber blackout. do.

All messages to be sent to the subscriber's IP set-top box (STB) 310 are stored in the EMM generator (EMMG) according to various queues. Each message is deleted after a certain period of time, so the queue does not continue to grow.

The reportback server transmits the information stored in the smart card in the IP set-top box 310 of the subscriber to the IPTV headend system.

In the above-described embodiment, the conditional access system (CAS) 120 is used to prevent illegal copying of IPTV contents, but instead, a digital rights management (DRM) scheme is used. Traffic waste due to ECM and EMM transmission can be reduced.

For example, in the compression multiplexing system 110, DRM encryption is applied to a broadcast video and audio signal and data broadcasting data for each channel by a DRM server, and DRM encryption is performed by DRM encryption of VOD content for a T-learning service. The key is transmitted to the subscriber's IP set-top box 310 together with the key.

The IP set-top box 310 of the subscriber receives the user ID from the subscriber management system 140 by receiving the ID and passwd of the subscriber, and then received using the DRM decryption key transmitted by the DRM interface module of the IP set-top box. The T-learning service may be used by decoding broadcast video and audio signals, data for broadcasting data, and T-learning content. In this case, if the user is not authenticated, the DRM decryption key cannot be used.

As such, when the DRM scheme is applied, the IP set-top box 310 of the subscriber does not need to use a reception restriction system and a smart card.

The back office system 130 is a provisioning system, and provides a billing processing function for using a T-learning service for each subscriber.

The subscriber management system 140 provides a member subscription and termination for the IPTV service, member information management function.

The monitoring system 150 is a control system that monitors a transmission failure of an A / V broadcast signal for IPTV broadcasting, a downlink of an IPTV headend system, and a reception failure and subtitle confirmation.

FIG. 6 is a diagram for describing a media management system (MOC) of the IPTV service system of FIG. 2.

The media operation system (MOC) 160 is a system for managing various business process information (program programming information, location information, contract information, product information, etc.) for operating a broadcasting task.

The media management system 160 manages broadcast program organization information, content and media management information, contract information of a program provider (PP) and a content provider (CP), and product information, and manages each system in the center of a broadcasting center. It acts as a coordinator that integrates and manages information flow through organic integration.

 The media management system (MOC) 160 manages contracts in terms of acquisition, manages media and content metadata, and acquires / manages EPG information, which is broadcast schedule information, and provides real-time broadcasting in terms of operation. Marketing analysis reporting, delivery such as settlement of CP / CA and subscriber viewing inclination in terms of VoD channel formation management, agent management with each subsystem, management of VoD catalog creation and various product analysis and analysis. ), Broadcast transmission monitoring, video server transmission management and VoD subscriber authentication, transmission result recording / management for settlement with CP / CA, and data synchronization with each subsystem.

The media management system (MOC) 160 receives a training VOD and a flash file through a service uploading server (Catcher) from a content server (Pitcher) of the content provider (CP) through the transaction server (distribution server) through the T- Send to VOD server and file server of multiple local nodes of learning system.

FIG. 7 is a diagram for describing a protocol of four layers of an IP set-top box (IP STB).

The IP set-top box (IP STB) is a hardware layer composed of STB hardware such as a CPU, a media processor, a flash RAM, and an Ethernet module, a system software layer including a system driver such as a device driver and an operating system, and a Java virtual machine. Java Virtual Machine (JVM), Conditional Access System (CAS) module and Digital Rights Management (DRM) interface module, middleware layer with streaming protocol (RTP, RTSP), MPEG2, MPEG4, It supports a variety of multi codecs such as MPEG7, H.264, WMV-9, and includes an Electronic Program Guide (EPG), a distance education web browser, or a T-learning client to select IPTV service channels. It includes four layers of the application layer. The subscriber's IP set-top box is assigned an IPv4 address or an IPv6 address.

The present invention also relates to a T-learning system 190, an EPG system 191, a data broadcasting system (DBS) 192 for transmitting IP packets by unicasting, and a return channel from subscriber stations (IP STBs, TVs). Return server (RS) system 193 that provides a bi-directional T-learning service through.

The T-Learning system 190, when the user authentication is confirmed in accordance with the authentication request message of the subscriber IP set-top box 310, the subscriber to the IP set-top box (STB) 310 to watch the broadcast signal at the same time interactive distance learning ( T-learning) provides distance education content for unicasting.

The EPG providing system 191 provides an electronic program guide (EPG) to the subscriber terminal.

The data broadcasting system 192 authors, verifies, organizes, and transmits the data broadcasting data.

The T-Learning system 190 includes a Learning Management System (LMS) 194 and a Contents On Demand (COD) system 197, and the subscriber's IP set-top box (STB) through a high-speed Internet network. Provides multimedia learning content for T-learning services by field of television (TV).

The distance learning content (T-learning content), including education content, early childhood education content for infants, elementary, middle and high school, lifelong education, language field, distance education video / voice, learning data (HTML material, PPT material, PDF Materials, word documents), learning flash games, animation data, images, problem solving data, and multimedia learning data including quiz data.

The COD system 197 is connected to the education management system (LMS) 194 to provide video and voice data for distance education to the IP set-top box 310 of the subscriber.

The data broadcasting system (DBS) 192 is a data agent manager for managing data encoding, a PSI / SI for generating program specific information / service information (SI). PSI / SI Generator, Data Server / Data Encoder for encoding data broadcasting data into broadcast video and audio signals, Multiplexer for managing multiplexing function of data on the broadcast video and audio signals A manager (Multiplexer Manager), and a scheduler user interface (Scheduler UI).

The data broadcasting system (DBS) 192 broadcasts the A / V data provided from the A / V server according to the terrestrial ACAP data broadcasting standard by an A / V encoder. Compresses the compressed video and audio signals from the application by the authoring tool by the data server / data encoder and the PSI / SI (Program Specific Information / Service Information) generator. It is multiplexed by a multiplexer together with the data broadcasting data and the T-learning content to encode and transmit the broadcast program data and related information from the collection and storage of the data broadcast program.

The return server (RS) system 193 processes bidirectional data by a data provider (DP), and delivers online bills from the subscriber's IP set-top boxes 310, and the usage history / billing interworking process of the bidirectional data. It receives the two-way data (eg, learning query / response data, two-way quiz data) for personalized authentication processing, and distance learning, and transmits the corresponding response data to the subscriber's IP set-top box 310 as unicasting It also provides server-side return path management to provide interactive T-learning services in IPTV.

The viewer provides a distance learning VOD service through a web or a T-learning client (IPTV client) for a distance learning (T-learning) service on the TV 300 connected to the IP set-top box (STB) 310. Study through learning data, learning flash, animation data, educational game, learning data provided with distance education videos, quiz service, promotion service, independent service through problem solving data, and the T-learning system In operation 190, a learning management service is provided.

In one embodiment, the T-learning system 190 is a remote education web (T) or T-learning on the TV 300 connected to the remote education content (eg, early childhood education content) subscriber IP set-top box 310 Provides educational VOD data and T-learning content (VOD, Flash, games, videos, animations, quizzes, etc.) to clients, and learning query / response data through return server (RS) system 193 Provides bi-directional T-learning service by transmitting and receiving.

Based on the ACAP standard of terrestrial TV, a predetermined number of main service menus initially exposed on the main screen of channels distributed for broadcasting are upgraded to multicasting with EPG information including a distance education service menu. The content (video, Java App, Flash, etc.) is downloaded and executed by Unicasting when clicked.

The T-Learning system 190 transmits only the content selected by the customer to the unicasting without transmitting all the educational content to the multicasting, so that the bandwidth can be efficiently used.

The initial menu of the IPTV T-learning service provides a sample menu that is available to non-subscribers, and all other T-learning content menus allow the subscriber to log in by entering ID / Passwd, and only authorized subscribers use the interactive T-learning service. Make it possible.

The Electronic Program Guide for T-learning service in the IPTV service menu provides viewers with an easy-to-use and convenient search function, Box List EPG, Text EPG, Mosaic EPG, Mini EPG, Navigator EPG. Any one of the electronic program guide (EPG) can be used to service.

8 is a diagram illustrating a T-learning service menu configuration in IPTV according to an embodiment of the present invention.

In one embodiment, when providing early childhood educational content (Kids portal) for the two-way T-learning services of IPTV, select the Fun country from the IPTV Portal (Portal) menu to log in to the main screen learning, enter the fun 6 Select the "Hangul Play" submenu connected to "Baby Study Country" among the two submenus and go to the Hangul Play menu page.

9 is a diagram illustrating a T-learning service screen through IPTV according to an embodiment of the present invention.

The television (TV) 300 connected to the IP set-top box (STB) 310 watches the broadcast signal transmitted from the IPTV headend system through the broadcast channel selected by the viewer by the key input unit or the remote controller, and simultaneously receives the electronic program guide. Enter the ID and Passwd through the (EPG) to authenticate the user, and then use the distance education web or T-learning client (IPTV Client) selected from the IPTV service menu to display the distance education content or early childhood education content for the T-learning service. It can receive video learning, interactive quiz learning, flash learning games through IPTV, and interactively send and receive interactive data.

10 is a configuration diagram of a T-learning system according to an embodiment of the present invention.

The service uploading server (Catcher server) of the media management system (MOC) 160 uses a file transfer protocol (FTP) from a transmission server (Pitcher) of a content provider (CP) to include a T- The learning content is received and updated in real time, and a VOD data and a flash file are transmitted to a plurality of VOD servers 197 and file servers by a transaction server.

At this time, the transmission server (Pitcher) of the content provider (CP) informs the results of the transmission of the T-learning content including the VOD data, the flash file to the Learning Management System (LMS) 194 in real time. Update the DB. The Data Manager (DM) of the Data Broadcasting System (DBS) 192 receives the object carousel (OC) update data transmitted from the Data Agent (DA) and associates with the EPG menu. The updated object kerosene (OC) data is transmitted to the subscriber IP set-top box 310 by multicasting.

 The education management system (LMS) 194 is an education management system (LMS) for managing distance education content, the T-learning service subscriber management module for managing subscribers of the T-learning service; Receives information about the ticket sent from the personalization authentication server, and receives the ticket (set-top box ID, subscriber information, whether to subscribe to the package) transmitted from the subscriber terminal to compare the authentication ticket to determine whether the valid user An authentication ticket confirmation module; And a learning evaluation management module for managing learning evaluation results for the T-learning service.

The SSO client of the IP set-top box 310 of the subscriber transmits an authentication request message for the T-learning service to the return server (RS) system 193.

The personalization authentication server receives an authentication request message for the T-learning service from the single sign-on (SSO) client of the subscriber's IP set-top box 310 through the return server (RS) system (return pass server) 193. When the authentication is confirmed by determining whether the member is a paid or free member, the ticket is transmitted to the SSO client of the IP set-top box 310 of the subscriber through the return server RS 193 in response thereto. Information about the ticket issued to the education management system (LMS) 194 is transmitted.

The personalization authentication server performs a personalized authentication process with a personalized account (ID, Passwd) for each household member.

The SSO client of the subscriber's IP set-top box 310 transmits the received ticket (encrypted set-top box ID (SAID) + subscriber information + package subscription) information to the education management system (LMS) 194.

The education management system (LMS) 194 receives information about a ticket issued from a personalization authentication server, and receives the ticket (encrypted set-top box ID (SAID) + subscriber) received from the IP set-top box 310 of the subscriber. Check the information on whether to use the T-learning service by comparing the information + whether to join the package or not).

When the authentication is confirmed, the media management system (MOC) 160 receives the remote education content request message including the address information of the IP set-top box of the subscriber selected by the user through the return server system 193, and optimizes. Local server URL information is transmitted to the IP set-top box 310 of the subscriber through the return server system (193).

Thereafter, the subscriber's IP set-top box 310 accesses the local server based on the received optimal URL information and receives the distance learning content from the corresponding VOD server 197 and the file server. In addition, the T-learning application and the flash can be downloaded to the subscriber IP set-top box 310. Sending and receiving of distance education content is done by unicasting.

FIG. 11 is a diagram for explaining a pitcher-catcher management system. The Pitcher-Catcher Management System is built on a Data Provider (DP), Content Provider (CP) and transmits the content referring to the transmission schedule to the Media Management System (MOC) 160 of the IPTV service system. A service uploading server for displaying a transmission server (Pitcher) system, a content list and items uploaded and located in the media management system 160, uploading the transmitted content to the NVOD gateway server, and uploading NVOD operation schedule information to the NVOD gateway server. It consists of (Catcher). Pitcher vs. Catcher system configurations are either 1: 1 or N: 1.

The service uploading server (Catcher) is not necessarily limited to one, two or more may be provided as shown in FIG.

In FIG. 11, two service uploading servers (Catcher) are connected with a MOC DB and a content database (NAS Storage), and a transaction server (distribution server) is connected with the content database.

The function of the delivery server (Pitcher) is to deliver a package from a plurality of content providers (CP) (transfer one package of the transmission schedule to each platform, monitor the package delivery status, display the package transmission results), NVOD schedule (transmission schedule) Transmission of the relevant date to the platform, monitoring the status of transmission of the ticket, display of the result of transmission of the ticket, search of the transmission result (search the transmission result and status of the package by the date of transmission, success, title, ID, etc.), system message output (system Message output, system error and status messages are sent to CMS) and digital rights management (DRM) for T-learning content is applied to provide stability (encryption transmission using Video Encryption Algorithm).

The service uploading server (Catcher) is a package arrival notification and NVOD server upload (notification when the package is sent from the delivery server, NVOD server registration of the transmitted package, Mpeg file NVOD server upload, upload of the transfer schedule), the package of the platform List and status display, monitoring gateway server communication (displaying communication status with NVOD gateway server), error monitoring (displaying for each error message, sending to error message CMS), stability through DRM application for T-learning content (VEA (Receive encryption using Video Encryption Algorithm).

The transaction server (distribution server) distributes content to a plurality of local VOD servers and file servers (local node servers) registered in the media management system (MOC) 160. The transaction server (distribution server) manages state information on the VOD server for each local node, and adds or deletes a server to the VOD server management list according to the corresponding information when adding and deleting the VOD server.

In an embodiment, the plurality of VOD servers and file servers (local node servers) may be distributed and installed in the plurality of subscriber aggregation devices 220 (see FIGS. 4 and 12).

12 is a diagram for explaining PIM-SM multicast routing in an L3 network layer.

Broadcast video and audio signals, data broadcast data, and EPG information (PSIP / PSI / SI information) transmitted from the IPTV headend system are IP-connected to a plurality of IP set-top boxes joined to a multicast group in the premium network 200. Transmitted data using a multicast protocol (e.g. PIM-SM), and bidirectional broadcast data for Interactive IPTV services is transmitted over a return channel through a unicast protocol (e.g. Routing Information Protocol (RIP), Open Shortest Path First (OSPF) Etc.).

IP multicast routing protocols used in the L3 switch of the IP premium network 200 include Distance Vector Multicast Routing Protocol (DVMRP), Multicast Extensions to OSPF (MOSPF), Core Based Tree (CBT), and Protocol Independent Multicast (PIM-SM). Multicast routing protocols of either -Sparse Mode) or Protocol Independent Multicast-Dense Mode (PIM-DM) can be used.

The Layer 3 network equipment includes routers, metro switches (L3 switches), N-Topia switches (L3 switches) (N-Topia: service using high-speed Internet through LAN equipment installed in a group building where UTP is installed), and subscriber concentrator. (L3 switch) 220, each using a PIM-SM multicast routing protocol.

In one embodiment, in the present invention, Layer 3 including each router of the backbone network / access network / subscriber network, metro switch (L3 switch), N-Topia switch (L3 switch), subscriber aggregation device (L3 switch) 220 The PIM-SM multicast routing protocol is used for the network equipment, and the subscriber station (IP STB) and the subscriber switch 230 use IGMP and IGMP Snooping protocols, respectively.

The Internet Group Management Protocol (IGMP) is used between an IP set-top box terminal requesting broadcast channel selection / release and a Layer 3 network device (eg, subscriber aggregation device 220) that accepts the request.

The IGMP Snooping protocol is a Layer 2 device (eg subscriber) located between an IP set-top box 310 terminal of a subscriber requesting channel selection / release and a Layer 3 network device (eg subscriber aggregation device 220) receiving the request. As a protocol driven by the switch 230, the Layer 2 device (subscriber switch 230) running the IGMP Snooping protocol recognizes an IGMP transmission / reception message between an IP STB terminal and a Layer 3 network device, and performs a channel request of the subscriber. Only the IP set-top box 310 transmits channel information.

In one embodiment, when all routers of the IP premium network 200 are installed with the PIM-SM multicast routing protocol daemon (daemeon), the subscriber's IP set-top box 310 is configured according to the IGMP joined multicast group The concentrator 220 receives broadcast video and audio signals, data broadcast data, and EPG information by IP multicasting.

The core router (RP: Rendezvous Point, rendezvous point) of the IP premium network 200 manages a PIM Join list and a PIM Prune list for each of a plurality of broadcast channels (eg, 100).

The core router (RP, rendezvous point) of the IP network (IP premium network) 200 manages a join list and a prune list for each of a plurality of multicast groups (broadcast channels) because the broadcast channel is a multicast group.

FIG. 13 is a diagram illustrating static join to reduce channel zapping time in a subscriber IP set-top box.

The static join method used to reduce the zapping time of a broadcast channel in the subscriber's IP set-top box is similar to that of the subscriber's IP set-top box 310 joined all groups (channels) in router 3 (subscriber concentrator 220). Similarly, Join is requested to the upper L3 network equipment (Router 3, 2, 1) (Subscriber Concentrator, Ntopia Switch, Metro Switch, Rendezvous Point (RP)). As a result, traffic of all broadcast channels (eg, 100 channels) is downloaded to the subscriber concentrator (router 3) 220, and the subscriber concentrator (router 3) 220 is assigned to all groups (all broadcast channels). In order to maintain), the Join message is periodically sent to the upper L3 network devices (Ntopia Switch, Metro Switch, Rendezvous Point (RP)). The cycle occurs within 128 seconds of the end of the group joining time to maintain the group (broadcast channel) continuously.

Regardless of whether the subscriber's IP set-top box (STB) joins the actual group (channel), the router (L3 network equipment) always participates in the group (channel), and like the IPTV, the subscriber aggregation device (router 3) 220 This is useful when the user should always be ready to receive IPTV broadcast channels.

Also, if the subscriber set-top box (STB) leaves group 1 (changes to another broadcast channel), the rendezvous point (RP) and router 1, even if the IGMP group leave message for group 1 withdrawal from the set-top box (STB) 2,3 (Metro Switch, Ntopia Switch, Subscriber Concentrator) always maintain Join in all multicast groups (all broadcast channels) regardless of the Subscriber Set Top Box (STB) IGMP Leave message. Therefore, a large amount of channel traffic of all broadcast channels (eg, 100 channels) of the IPTV headend system reaches the subscriber concentrator (router 3) 220.

Since the subscriber concentrator 220 downloads the traffic of all broadcast channels, the subscriber channel setting time reduces the broadcast channel zapping time from the IP set-top box 310 of the subscriber and broadcast video and audio signals of the corresponding broadcast channel according to the requested IGMP Join message. , Data broadcast data and EPG information (PSI / SI information).

Accordingly, the IP set-top boxes 310 of the plurality of subscribers access the subscriber aggregation device 220 according to the IGMP Join / Leave message to select / release the IPTV service broadcast channel and receive the IPTV broadcast service.

14 is a flowchart illustrating a method for transmitting distance education content in an IPTV service system according to an embodiment of the present invention.

The baseband system 100 frame-synchronizes a broadcast signal received from a program provider (PP) or terrestrial wave, and distributes broadcast signals to output broadcast video and audio signals (step S10).

At least one of an advertisement, a logo, or a caption may be inserted into the broadcast video and audio signal by a caption generator (CG).

The compression multiplexing system 110 compresses and streams broadcast video and audio signals received from the baseband system 100 for each broadcast channel, and streams them according to terrestrial ACAP (Advanced Common Application Platform) data broadcasting standard. After multiplexing the broadcast video and audio signal with EPG information (PSIP / PSI / SI information) including data broadcasting data and distance education service menu, the multiplexed MPEG-2 TS stream is IP packetized (step S11).

The network switch system 170 transmits the received IP packetized transport stream to the IP set-top boxes 310 of the plurality of subscribers in a multicasting manner through the IP network (step S12).

Receive an authentication request message for a T-learning service from the SSO client of the subscriber's IP set-top box 310 to the personalization authentication server through the return server (RS) system 193, and the personalization authentication server confirms ticket authentication. (Step S13).

If ticket authentication is confirmed by the personalization authentication server (step S14), it is determined whether to subscribe to a service for checking whether a paid or free member (step S15), and if it is a paid member, a ticket indicating a paid member of the T-learning service is returned. (RS) is transmitted to the IP set-top box 310 of the subscriber via the system 193 (step S16).

In step S15, if a free member, a ticket indicating a free member of the T-learning service is transmitted to the IP set-top box 310 of the subscriber through the return server (RS) system 193 (step S17).

 When the media management system (MOC) 160 receives the provision request message for the distance learning content selected by the user through the return server system 193, the media management system 160 receives the optimal COD local server URL information. It transmits to the IP set-top box 310 of the subscriber via the return server system 193 (step S18).

When accessing the optimal COD area server URL information from the IP set-top box 310 of the subscriber, the IP set-top box 310 of the subscriber to the T-learning content including VOD data and educational flash data (Step S19).

At this time, the education management system (LMS) receives the information about the ticket issued from the personalization authentication server, and then from the SSO client of the IP set-top box 310 of the subscriber (encrypted set-top box ID (SAID) + encryption) The received subscriber information + package subscription information) to check whether the T-learning service is used (step S20).

15 is a flowchart illustrating a method of receiving remote education content in an IP set-top box of a subscriber according to an embodiment of the present invention.

Web or T-learning client for distance education receives the member information for the T-learning service, and transmits the member information to the T-learning system to receive the ID and password (step 30).

EPG information including broadcast video and audio signals, data broadcasting data, and tele-education service menus transmitted from the IPTV headend in a multicasting manner to a broadcasting channel tuned from the TV 300 connected to the subscriber IP set-top box 310. Is received (step S31).

When the web for education or T-learning client selects the T-learning service portal menu using the electronic program guide (EPG), the SSO client sends an authentication request message to the personalization authentication server (step S32).

When the user is authenticated by the personalization authentication server (step S33), the SSO client receives a ticket through the return server (RS) system 193 (step S34).

On the basis of the received ticket, it is determined whether or not the paid member (step S35), if the paid member to activate the corresponding item of the menu of the T-learning service (step S36), if only a free member of the menu of the T-learning service menu Activate (step S37).

After transmitting the request for providing the distance learning content selected by the user to the media management system (MOC) 160 via the return server system 193 (step S38), the distance learning web or T-learning client Receives optimal COD local server URL information from media management system (MOC) 160 via return server (RS) system 193 (step 39).

Thereafter, the subscriber's IP set-top box 310 transmits a ticket (set-top box ID + subscriber information + package subscription) information to the education management system (LMS) (step S40).

The distance learning web browser or T-learning client accesses the T-learning system 190 including a VOD server and a file server corresponding to the optimal COD local server URL information, such as distance education contents (video / audio, learning data). , Educational flash, interactive quiz learning, animation, image, etc.) are received (step S41).

The web or T-learning client for distance education connects to the T-learning system 190 via the return server (RS) system 193 through an internet network, and interactive learning query / response data and interactive quiz. The training data is transmitted and received (step 42).

In the case of a paid member, the web or T-learning client for distance learning receives the result of the distance learning learning evaluation from the T-learning system 190 (step S43), and when the user clicks the end button ( Step S44), the reception of the educational content of the T-learning service is terminated (step S45).

According to the present invention, a viewer may be provided with a television (TV) connected to an IP set-top box (STB) 310 of a subscriber through an high-speed Internet network from an IPTV headend system based on the ACAP (Advanced Common Application Platform) data broadcasting standard of the IPTV service. Interactively interactive by receiving a remote education content from the T-learning system 190 to a web or T-learning client from the T-learning system 190 while simultaneously watching a broadcast signal through a broadcast channel selected by a key input unit or a remote controller. You can learn multimedia.

The method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

In the above-described embodiment, the distance education content received from the content provider (CP) is stored in a plurality of local servers, but the present invention is not limited thereto. For example, only one COD server is provided, and this COD server may provide distance learning services for all user terminals.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below Or it may be modified.

As described above, an IPTV service system for terrestrial broadcasting and a method of transmitting / receiving the remote education content according to the present invention are based on an IPTV headend system based on the ACAP (Advanced Common Application Platform) standard of IPTV service for terrestrial data broadcasting. From the T-learning system to watch the broadcast signal from the T-learning system and watch the broadcast signal from the T-learning system to the television (TV) connected to the IP set-top box (STB) through the high-speed Internet network. -Targeting client transmits distance education contents and early childhood education contents to provide interactive data broadcasting services such as video learning, interactive quiz learning, flash learning, educational game, learning question and answer, and learning evaluation management based on learning data on TV. Interactively through the return server system It has the effect of providing an interactive T-learning services.

Claims (34)

In the IPTV service system for providing distance education content, A baseband system for frame synchronization of a broadcast signal received from a program provider (PP) or terrestrial wave, and for distributing broadcast signals for each channel to output broadcast video and audio signals; A data broadcasting system for authoring, verifying, organizing, and transmitting data for data broadcasting; An EPG providing system for providing an electronic program guide (EPG) including a distance education service menu to a user terminal; Compress and stream the broadcast video and audio signals received from the baseband system for each channel, and multiplex the streamed broadcast video and audio signals with the data broadcast data and EPG information, and then multiplex the streams with the IP packets. Compression multiplexing system for outputting video; A media management system (MOC) for managing program organization or program information of terrestrial, metadata management information of distance education content, and contract information of distance education content provider (CP); A distance learning system for providing distance education contents for a two-way distance learning (T-learning) service to a plurality of user terminals; A network switch system for transmitting the IP packetized signal received from the compression multiplexing system to a user terminal through an IP network in a multicast manner; And A return server (RS) system connected to the user terminal via the IP network via a return channel and receiving bidirectional data from the user terminal in an unicasting manner for interactive distance education services; IPTV service system providing a distance learning content comprising. The method according to claim 1, Receive an authentication request message for using the distance learning service from the user's terminal through a return server (RS) system, the user receives an authentication ticket in response to the authentication request message through the return server (RS) system Sending to the terminal, IPTV service system for providing distance learning content further comprises a personalization authentication server for transmitting information on the ticket to the distance learning system. The method according to claim 2, The distance education system, A T-learning service subscriber management module for managing subscribers of the T-learning service; An authentication ticket confirmation module for receiving information on a ticket transmitted from the personalization authentication server and identifying a subscriber who is using a distance learning service by receiving a ticket transmitted from the user terminal; And Learning Assessment Management Module to manage learning evaluation results of each subscriber for T-learning services IPTV service system for providing distance education content, characterized in that it comprises a training management system (LMS) having a. The method according to claim 3, The distance education system, Further comprising at least one Contents On Demand (COD) server for providing distance learning content for a T-learning service to the user terminal, The media management system includes a service uploading server for receiving distance education content from a delivery server of a distance education content provider, a content database for storing distance education content received through the service uploading server, and a COD of the distance education system. IPTV service system for providing distance learning content further comprises a transaction server for transmitting distance education content stored in the content database to the server. The method according to claim 4, The at least two COD servers are distributed in various regions, and the transaction server of the media management system transmits the distance learning contents to each COD server in a multicasting manner. system. The method according to claim 1, The distance learning content (T-learning content), IPTV service system, characterized in that to provide distance education content, including education content for infants, elementary and middle school, college, continuing education, and language. The method according to claim 1, The distance learning content (T-learning content), An IPTV service system for providing distance education contents, which is multimedia learning data including distance education video / audio data and document type data. The method according to claim 1, The compression multiplexing system, And the streamed broadcast video and audio signal, the data broadcasting data, and the EPG information are multiplexed according to an ACAP (Advanced Common Application Platform) data broadcasting standard. The method according to claim 1, The compression multiplexing system, And the broadcast video and audio signal, the data broadcasting data, and the EPG information are streamed by MPEG2 TS. The method according to claim 1, The baseband system, And at least one of an advertisement, a logo, and a subtitle in the broadcast video and audio signal. The method according to claim 1, The network switch system, One or more L3 switches (L3 SW) for transmitting the IP packetized signal to an IP network by multicasting; At least one L4 switch (L4 SW) for connecting the return server system and the subscriber station and load balancing the bidirectional data reception traffic in a unicast manner by dividing the load with a suitable load; And One or more intrusion prevention systems for blocking harmful traffic between the L4 switch and an IP network; IPTV service system for providing distance education content comprising a. The method according to claim 1, IPTV service system for providing distance education content, characterized in that it further comprises a subscriber management system for subscription and termination, membership information management for IPTV services. The method according to claim 1, An IPTV service system for providing distance education content, further comprising a back office system for billing for use of T-learning service for each subscriber. The method according to claim 1, The user terminal is an IPTV service system for providing remote education content, characterized in that it comprises a TV or an IP set-top box, a computer, a notebook, and a personal portable terminal connected to the user's TV. The method according to claim 1, The user terminal, Hardware layer consisting of CPU, media processor, flash RAM, hardware of Ethernet module, system software layer including device drivers and operating system, Java Virtual Machine (JVM), Restriction of Access System (CAS) and Digital Rights Management (DRM) interface module , A middleware layer with streaming protocols (RTP, RTSP), an electronic program guide (EPG) for selecting IPTV service channels including distance education services, a Web browser for distance education, or a T-learning client. IPTV service system for providing distance education content, characterized in that it comprises an application layer that supports multiple codecs. The method according to claim 15, The multi codec includes an MPEG2, MPEG4, MPEG7, H.264, WMV-9 codec. The method according to claim 1, The L3 network equipment used for the IP network uses a Protocol Independent Multicast-Sparse Mode (PIM-SM) multicast routing protocol, and the subscriber station uses an IGMP Join / Leave message to select / release a broadcast channel. The L2 network equipment of the subscriber network connecting the IP network and the user terminal uses the IGMP snooping protocol to recognize the IGMP transmission / reception message of the terminal of the subscriber who has made a channel request. . In the method for transmitting the distance learning content in the IPTV service system, (a) frame-synchronizing a broadcast signal received from a program provider (PP) or terrestrial by a baseband system and distributing broadcast signals to output broadcast video and audio signals; (b) the compression multiplexing system compresses and streams the broadcast video and audio signals received for each channel, and multiplexes the streamed broadcast video and audio signals with EPG information including data broadcasting data and a distance education service menu. IP packetizing the multiplexed stream; (c) the network system transmitting the received IP packetized transport stream to the plurality of user terminals in a multicasting manner via the IP network; And (d) receiving a request message for providing distance education content from the user terminal through a return server system and providing the corresponding distance education content to the user terminal in a unicasting manner; Method for transmitting the distance learning content in the IPTV service system comprising a. The method according to claim 18, Receives an authentication request message for a T-learning service from a user terminal to the personalization authentication server through the return server system, and confirms whether to enroll in a distance learning service and sends a corresponding ticket to the return server RS. A method for transmitting distance education content in an IPTV service system, the method further comprising transmitting to a user terminal through a system. The method according to claim 19, Receiving information on the ticket transmitted from the personalization authentication server, and receiving the ticket transmitted from the user terminal to identify the subscriber using the remote education service remotely in the IPTV service system, characterized in that How to send educational content. The method according to claim 18, Step (d) is, (d-1) if authentication is confirmed, the media management system (MOC) transmitting URL information of a COD server to the user terminal through the return server (RS) system; And (d-2) receiving, by the COD server, a request for providing distance education content from the user terminal and providing a corresponding distance education content to the user terminal; Method for transmitting the distance learning content in the IPTV service system comprising a. The method of claim 21, The service uploading server of the media management system (MOC) further includes receiving new distance education content from a content server (CP) 's delivery server, storing the new distance education content in a content database, and transmitting the new distance education content to the COD server through a transaction server. Method for transmitting the distance learning content in the IPTV service system, characterized in that. The method of claim 22, A compression multiplexing system after receiving the transmission result of the distance education content to the media management system (MOC) from the transmission server of the content provider (CP) to the education management system (LMS), updating the EPG information related to the distance education service And providing the distance learning content in the IPTV service system. The method of claim 18, Step (a) is, And inserting at least one of an advertisement, a logo, and a subtitle into the broadcast video and audio signal. The method of claim 18, Step (b) is, And multiplexing the broadcast video and audio signal, the data broadcasting data, and the EPG information according to a terrestrial Advanced Common Application Platform (ACAP) data broadcasting standard. The method of claim 18, Step (b) is, The broadcast video and audio signal, data broadcasting data, EPG information is streamed in the MPEG-2 TS method for transmitting the distance learning content in the IPTV service system. The method of claim 18, Step (b) is, The broadcast video and audio signal is encrypted (scrambled), and then IP packetized and transmitted to the network, characterized in that for transmitting the remote education content in the IPTV service system. The method of claim 18, Method for transmitting the distance learning content in the IPTV service system, characterized in that it further comprises a subscriber management step of managing the subscription and termination, the member information for the distance education service. The method of claim 18, Method for transmitting the distance learning content in the IPTV service system further comprising the charge processing step for the use of the T-learning service for each subscriber. A method for receiving distance education content in an IPTV service system, (a) if a T-learning service portal menu is selected using an electronic program guide (EPG), transmitting an authentication request message for using the T-learning service to a personalized authentication server; (b) receiving an authentication ticket from a personalization authentication server via a return server (RS) system; (c) checking whether to subscribe to the service based on the received authentication ticket, and activating a corresponding menu item of the T-learning service if the service is subscribed; (d) transmitting a provision request message for the distance learning content selected by the user to the media management system; (e) receiving URL information of a COD server storing distance learning contents from a media management system (MOC) through a return server (RS) system; (f) transmitting ticket information to an education management system (LMS); And (g) a distance education web browser or a T-learning client accessing the COD server to receive distance education content; How to receive distance education content in the IPTV service system comprising a. The method of claim 30, Step (c) is, Checking whether to subscribe to a service based on the received authentication ticket, and activating only a tasting menu item of the T-learning service if not subscribed to the service. The method of claim 30, And transmitting and receiving interactive learning data by accessing the distance learning system through the return server system through an internet network. The method of claim 30, And receiving a result of the distance education learning evaluation from the distance education system. To a computer or an IP set-top box (IP STB) or personal digital assistant (a) if a T-learning service portal menu is selected using an electronic program guide (EPG), transmitting an authentication request message for using the T-learning service to a personalized authentication server; (b) receiving an authentication ticket from the personalization authentication server via a return server (RS) system; (c) Check whether the service is subscribed based on the received authentication ticket, and activate the corresponding menu item of the T-learning service if it is subscribed to the service. Activating function; (d) transmitting a provision request message for the distance learning content selected by the user to the media management system; (e) a function of receiving URL information of a COD server storing distance learning contents from a media management system (MOC) through a return server (RS) system; (f) transmitting ticket information to an education management system (LMS); And (g) a distance education web browser or a T-learning client accessing the COD server to receive distance education content; A recording medium that can be read by a computer or an IP set-top box (STB) that has recorded a program for realizing the function.

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