KR100823421B1 - IPTV service system and network, content and data transmission and reception method - Google Patents

Abstract

The present invention relates to an IPTV service system and a network, a method of transmitting and receiving content and data. The IPTV service system includes: a baseband system for converting a broadcast signal received from a program provider (PP) or terrestrial wave into an SDI signal, synchronizing frames, and distributing broadcast signals for each channel to output broadcast video and audio signals; Compress and stream the broadcast video and audio signals received from the baseband system for each broadcast channel, multiplex the streamed broadcast video and audio signals with the data and content signals for data broadcasting, and then multiplex the streams with the IP packets. Compression multiplexing system for outputting video; And a network switch system for receiving an IP packetized transport stream received from the compression multiplexing system to an IP set-top box connected to a subscriber's TV through an IP network, a reception restriction system, a subscriber management system, and a back office system. , Monitoring system, media management system (MOC), and return server (RS) system. Therefore, while watching a broadcast signal from a terrestrial IPTV headend system to a TV connected to an IP set-top box via a high-speed Internet network, it provides an interactive IPTV service.

Terrestrial, ACAP Standard, Interactive, IPTV Systems

Description

IPTV service system and network, and method of transmitting and receiving its contents and data

1 is a diagram illustrating a TV connected to an IP set-top box (STB) of a subscriber connected to a high-speed Internet network.

2 is a block diagram of an IPTV service system for terrestrial broadcasting.

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

Figure 4 is a block diagram of the IPTV service overall system for terrestrial broadcasting according to an embodiment of the present invention.

FIG. 5 is a diagram for describing a baseband system of the IPTV service system of FIG. 4. FIG.

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

FIG. 7 is a diagram for describing a reception restriction system (CAS) of the IPTV service system of FIG. 4.

FIG. 8 is a diagram for describing scrambling of an access control system (CAS) and descrambling according to a smart card based control word (CW).

9 is a view for explaining a media management system (MOC: Media Operation Core) of the IPTV service system of FIG.

FIG. 10 is a diagram illustrating an internal configuration of an IPTV service system for terrestrial broadcasting shown in FIG. 4.

11 is a flowchart illustrating a reportback process for an IPPV purchase history from an IP set-top box.

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

FIG. 13A illustrates PIM-SM multicast routing according to an IGMP Join / Leave message in a subscriber set-top box according to a first embodiment of the present invention. FIG.

FIG. 13B is a diagram for explaining static join to reduce a number of broadcast channel zapping times in a subscriber set top box according to a second embodiment of the present invention. FIG.

FIG. 14 is a diagram illustrating an ADTP, VDSL, and FTTH (Fiber To The Home) network using a Utop Ntopia and a twisted pair according to another embodiment of the present invention. FIG.

15 is a flowchart illustrating a method of receiving content and data from an IPTV service system in an IP set-top box.

<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: additional service system

171: T-Contents system 172: Return Server (RS) system

173: data broadcasting system 190: network switch system

200: premium network 210: internet network

201: Multicast Supported Router 211: Unicast Supported Router

220: subscriber switch 230: subscriber concentrator

310: IP set-top box (IP STB) 300: TV

The present invention relates to an IPTV service system. In particular, the present invention relates to an IPTV service system, and in particular, to view a broadcast signal from a IPTV headend system through a tuned channel of a TV connected to an IP set-top box (STB) through a high-speed Internet network. At the same time, the present invention relates to an IPTV service system, a network, and a content and data transmission / reception method for providing an interactive IPTV service by providing various T-Contents and transmitting and receiving bidirectional data through a return server system.

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

IPTV services are called IPTV in the US, ADSL TV in Europe, and broadband broadcasting in Japan.

The main components of the IPTV service system include an IPTV Headend System, an IP Backbone Network, an IP Backbone, an Access Network (eg xDSL, HFC, FTTC, FTTH), and a Subscriber Terminal (STB, TV).

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. A TV connected to an IP set-top box (STB) via an internet network receives Internet multimedia contents including audio, video, and packet data, and is interactively used by using a bidirectional communication channel as a return path concept. Use TV service.

1 is a diagram illustrating a TV connected to an IP set-top box (STB) of a subscriber connected to a high-speed Internet network (xDSL, FTTC, FTTH).

As shown in FIG. 1, a TV terminal connected to an IP set-top box (STB) equipped with a middleware protocol for IPTV service is a telephone convergence service in the digital convergence era, which includes telephone, internet, and broadcasting. It will provide triple play service (TPS) of VoIP, high-speed internet, and IPTV service, and require next-generation Gigabit or more ultra-wide bandwidth from premium IPTV headend system to premium service. Receives broadcast and Internet content through SD / HD-level ICOD (Internet Contents On Demand) service through a communication network.

The standardization of IPTV's Data Broadcasting is the Terrestrial Data Broadcasting at 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. Advanced Common Application Platform (ACAP) and Society of Cable Television Engineers (SCTE) are pushing for standardization of data broadcasting for cable TV's Open Cable Application Platform (OCAP). IP Set-Top Box (STB) is an application for IPTV application services. It adopts JAVA technology to provide interactive IPTV services.

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

However, in the conventional television (TV), the broadcast signal transmitted from the terrestrial TV broadcasting system is broadcast and received in one direction, and the broadcast signal is not provided through the tuned broadcast channel and the interactive IPTV service is not provided at the same time. There was a problem.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is based on the Advanced Common Application Platform (ACAP) standard of terrestrial data broadcasting from an IPTV headend system through an IP set-top box (STB) through a high-speed Internet network. IPTV service system for providing interactive IPTV service by providing a variety of T-Contents and simultaneously transmitting and receiving data through a return server system while watching a broadcast signal through a tuned broadcast channel of a TV (TV) connected to To provide a network, content and data transmission and reception method.

In order to achieve the object of the present invention, the IPTV service system 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 signal for each channel to output a broadcast video and audio signal Baseband systems; Compress and stream the broadcast video and audio signals received from the baseband system for each channel, multiplex the streamed broadcast video and audio signals with data and data signals for data broadcasting, and then packetize the multiplexed streams with IP packets. Compression multiplexing system for outputting; A network switch system for transmitting the IP packetized transport stream received from the compression multiplexing system to a subscriber terminal through an IP network in a multicast manner; And a return server system connected to the subscriber terminal via the IP network in a return channel and receiving bidirectional data from the subscriber terminal in an unicasting manner for interactive service.

The subscriber terminal includes an IP set-top box, a computer, a laptop, a personal portable terminal, and a mobile communication terminal connected to a TV or a user's TV.

The compression multiplexing system is characterized in that the broadcast video and audio signals are streamed using the MPEG-2 TS method.

The baseband system further includes a function of inserting at least one of an advertisement, a logo, or 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 transport stream to an IP network by multicasting; At least one L4 switch (L4 SW) for connecting the return server system to the subscriber's terminal and load balancing the bidirectional data receiving traffic in a unicasting manner between the return server systems and the loads; And at least one intrusion prevention system for blocking harmful traffic between the L4 switch and the IP network.

The present invention further includes an IP media customer equipment management system (IP_CEMS) that manages device information and history information of a subscriber station and provides remote diagnosis and statistical functions.

Preferably, the IPTV service system according to the present invention further includes a subscriber management system for managing membership and subscription and termination of membership for the IPTV service.

Preferably, the IPTV service system according to the present invention further includes a back office system for billing processing for use of the IPTV service for each subscriber.

Preferably, the IPTV service system according to the present invention further includes a monitoring system for monitoring the transmission or reception failure by monitoring the downlink associated with the IPTV service.

Preferably, the IPTV service system according to the present invention further includes a media management system (MOC) for managing program information of a program provider or terrestrial program, and contract information of a content provider (CP).

Preferably, the IPTV service system according to the present invention controls the viewing authority by performing encryption on the broadcast video and audio signals and pre-encryption of the contents in order to prevent illegal viewing and illegal mass duplication. It further includes a conditional access system that restricts reception only.

The reception limitation system is characterized by scrambling a broadcast video and audio signal for each channel by a scrambler.

The reception restriction system includes: an ECM generator for generating encrypted content control information (ECM) using content acquisition schedule information; An EMM generator for providing an interface between a back office system and a subscriber terminal, generating an authentication stream according to a specific request from the back office system, and transmitting an encrypted subscriber information message (EMM) to the subscriber terminal. ; And a reportback server for receiving the report back from the subscriber terminal through the return server system and transmitting the report back to the back office system to settle billing data.

Preferably, the IPTV service system according to the present invention further includes an additional service system for providing the interactive service in a unicasting manner in response to a request from a subscriber station received through the return server system.

The supplementary service system includes 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) to the subscriber station; And a T-Contents system for providing contents for an IPTV service to the subscriber station.

The subscriber station includes a hardware layer composed of a CPU, a media processor, a flash RAM, and an STB hardware including an Ethernet module, a system software layer including a device driver and an operating system, a Java virtual machine (JVM), and a reception restriction system (CAS). Access System (DRM) and Digital Rights Management (DRM) interface module, middleware layer with streaming protocols (RTP, RTSP), electronic program guide (EPG) to support various multi-codecs and select IPTV service channel, It includes an application layer that includes a Web browser or client.

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

In order to achieve another object of the present invention, an IPTV service network is a Gigabit or more broadband IP network for an IPTV service, and includes an L3 network equipment using an IP multicast routing protocol, and is transmitted from an IPTV headend system. A premium network for transmitting the IP packetized stream including the broadcast video, audio signal and data signal in a multicasting manner; And an L2 network equipment, and an access network connecting the premium network and the subscriber terminals.

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

The L3 network equipment used for the premium network uses a Protocol Independent Multicast-Sparse Mode (PIM-SM) multicast routing protocol, and the subscriber station uses an IGMP Join / Leave message for selecting / deselecting a broadcast channel. L2 network equipment of the subscriber network 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 reduce the channel zapping time at the subscriber's terminal, the designated router (DR) of the premium network connected to the subscriber network receives traffic of all broadcast channels by requesting join to the upper L3 network equipment for all multicast groups. It is done.

The designated router (DR) periodically transmits a join message to the upper L3 network equipment to continuously maintain join for all broadcast channels.

The designated router does not transmit the prune message to the upper L3 network device even if the subscriber receives the IGMP Leave message from the terminal.

The premium network transmits the IP packetized stream from the IPTV headend system to the subscriber's terminals using the IP multicast routing protocol, and unicasts the bidirectional data transmitted from the subscriber's terminals through a return channel. ) To the IPTV headend system using the protocol.

In order to achieve another object of the present invention, a method for transmitting content and data in an IPTV service system according to the present invention includes: (a) receiving a broadcast signal from a program provider (PP) or terrestrial broadcast and broadcasting by a baseband system; Synchronizing frames for each channel and centralizing and outputting broadcast signals; (b) receiving and compressing the broadcast video and audio signals provided from the baseband system by a compression multiplexing system, compressing the streamed broadcast video and audio signals, and multiplexing the streamed broadcast video and audio signals and data broadcasting data and content signals; (c) IP packetizing the multiplexed transport streams and transmitting the multiplexed transport streams to a plurality of subscriber stations in a multicast manner through an IP network; And (d) receiving the interactive data from the terminal of the subscriber via the return channel to the return server (RS) system.

In the step (a), it further comprises the function of inserting the advertisement, logo, subtitles in the broadcast video and audio signal.

In the step (b), the broadcast video and audio signals are streamed by the MPEG-2 TS method.

In the method for transmitting content and data in the IPTV service system according to the present invention, between step (b) and step (c), (b1) performing encryption on broadcast video and audio signals, data broadcasting data and content signals, And a reception restriction step of restricting the reception of the broadcast video and audio signal, the data broadcast data and the content signal to the authenticated user by controlling the viewing authority.

In order to achieve another object of the present invention, a method for receiving content and data at an IPTV subscriber station connected to an IPTV service system according to the present invention includes: (a) a client for an IPTV service installed in an IPTV subscriber station provides an IPTV service; Receiving member information for transmitting the member information to the IPTV service system; (b) if a specific IPTV service is selected using an electronic program guide (EPG), requesting an ID and password for using the selected IPTV service for user authentication; (c) if the user is authenticated in step (b), receiving and outputting a broadcast video and audio signal, a data broadcast data, and a content signal received from a corresponding channel from an IPTV service system through an IP network; (d) when bidirectional data is input from the subscriber, transmitting the bidirectional data to the IPTV service system via a return server (RS) system through a return channel; (e) receiving corresponding response data from the IPTV service system based on the bidirectional data; And (f) when the user clicks the end button, terminating reception of the selected service.

In order to achieve another object of the present invention, the present invention provides an IP set-top box (IP STB) or a computer or a personal portable terminal, (a) receiving member information for an IPTV service from a user and converting the member information into an IPTV service. Sending to the system; (b) if a specific IPTV service is selected using an electronic program guide (EPG), requesting an ID and password for using the selected IPTV service for user authentication; (c) a function of accessing an IPTV service system and receiving broadcast video and audio signals, data broadcast data and content signals received from a corresponding channel through an IP network and outputting the data to a screen when the user is authenticated in step (b); (d) transmitting bidirectional data to the IPTV service system via a return server (RS) system through a return channel when bidirectional data is input from a subscriber; (e) receiving corresponding response data from an IPTV service system based on the bidirectional data; And (f) a recording medium readable by a computer or an IP set-top box (STB) that records a program for realizing a function of terminating reception of the selected service when the user clicks the end button.

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

2 is a configuration diagram of an IPTV service system for terrestrial broadcasting.

The IPTV service system includes IPTV broadcast video and audio signals, data broadcasting data, T-Contents data, and program related information / service information provided from a T-Contents server of a broadcast program provider (PP) / terrestrial or an IPTV content provider (CP). IPTV Headend system for transmitting (PSI / SI), IP backbone network that provides Multicast Routing Protocol to IP network, access network that is access network / subscriber network (e.g. Ethernet, WLAN, WiBro, xDSL, HFC, FTTC, FTTH), and subscriber terminal (STB, TV) including a TV connected to the IP set-top box (STB).

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

The subscriber station may use a computer, a laptop, a personal portable terminal, or a mobile communication terminal in addition to the set-top box built-in TV and the IP set-top box connected to the user's TV.

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

The IP STB includes a hardware layer including STB hardware such as a CPU, a media processor, a flash RAM, and an Ethernet module, a system software layer including system software such as a device driver and an operating system (OS), Java Virtual Machine (JVM), Conditional Access System (CAS) and Digital Rights Management (DRM) interface, streaming, providing hardware and operating system communication with other mobile terminals Middleware layer with protocols (RTP, RTSP), MPEG-2, MPEG4, MPEG7, H.264, WMV-9, etc. Supports various codecs (Multi Codec) and electronic program guide (EPG: Electronic) to select IPTV service channel Program guide), a web browser that provides T-Contents, or four layers of an application layer including a client (IPTV client). The IP set top box (STB) 310 may use an IPv4 address or an IPv6 address.

Figure 4 is a block diagram of the overall system for terrestrial broadcasting IPTV service according to an embodiment of the present invention. FIG. 12 is a diagram illustrating an internal configuration of the terrestrial broadcasting IPTV service system of FIG. 4.

Referring to FIG. 4, the IPTV headend system includes a baseband system 100, a compression multiplexing system 110 including a data broadcasting system (DBS), a reception restriction system 120, and a back office system 130. ), Subscriber management system 140, monitoring system 150, media management system (MOC: Media Operation Core) 160, additional service system 170, and network switch system 190.

The supplementary service system 170 includes a T-Contents system 171, a return server (RS) system 172, a data broadcasting system 173, and an EPG providing system 174.

FIG. 5 is a diagram for describing a baseband system of the IPTV service system of FIG. 4.

The baseband system 100 receives an MPEG-2 broadcast signal from an external program provider (PP), or an analog broadcast signal from terrestrial waves, and converts the received source broadcast signal into a SDI (Serial Digital Interface) signal. Synchronize frames, distribute broadcast signals to multiple broadcast channels (e.g. 100 channels) via a routine switcher, and optionally advertise them to broadcast signals on that channel by a subtitle generator (CG: Character Genarator) Insert the logo, subtitle and transmit 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 analog broadcast signals through a receiving device (eg, DS-3 station, Yagi antenna, IRD) for receiving broadcast signals such as a program provider (PP) and terrestrial wave, respectively. (Tuner), a frame synchronizer for converting and correcting source broadcast signals received from a receiving device into SDI signals (frame synchronization), and all broadcast signal channels for operation management (e.g., 100 channels). A signal divider such as an A / V router that connects / concentrates) and a character generator that edits and processes the signal by inserting advertisements, logos, and captions into the SDI signal.

FIG. 6 is a diagram for describing a compression multiplexing system of the IPTV service system of FIG. 4.

The compression multiplexing system 110 inputs a broadcast signal (Video, Audio) transmitted from the baseband system 100 to an A / V encoder, compresses the video signal to H.264, and compresses the audio signal. MPEG-2 AAC is compressed to generate MPEG-2 TS, and the compressed video / audio MPEG-2 TS is multiplexed with data and data signals for data broadcasting generated by a data encoder. IP multicasting through the network switch system 190 after encrypting the multiplexed MPEG-2 TS (Transport Stream) by a scrambler and finally IP packetizing the IP packetized TS (Transport Stream). It transmits to the premium network 200 through a gigabit dedicated line using the method.
The content signal includes table information for enhanced TV service. The table information may include program related information.

The network switch system 190 provides a function of IP multicasting the IP packetized transport stream to the IP premium network 200 based on a Class D IP multicast address. IP multicasting can use IPv4 multicasting and IPv6 multicasting technologies.

In one embodiment, when the network switch system 190 uses IPv4 multicasting, the IPv4 multicast address may use 224.0.0.1 to 239.255.255.255, and broadcast channel-specific (eg, 100 channels) for IPTV service. ) To assign multicast addresses differently. For example, SBS may use 224.1.1.1, KBS may use 224.1.1.2, and YTN may use a multicast address for IPTV services of 224.1.1.3.

Referring to FIG. 10, the network switch system 190 includes an L3 switch (L3 SW), an L4 switch (L4 SW), and an intrusion prevention system (IPS).

In the embodiment shown in Fig. 10, each is redundant for stable transmission of data.

The IP Media Customer Equipment Management System (IP_CEMS) and the Premium Edge Router (PE) shown in FIG. 10 are not part of the network switch system 190, but are shown together for convenience of description. It became.

The L3 switch (L3 SW) is a device for transmitting IP packets to IP multicasting, that is, a device that provides a switching hub function and a routing function.

The L4 switch (L4 SW) is a device that load balances bidirectional traffic that is performed in a unicasting manner between the return server system 172 and the IP set-top box 310.

The return server system 172 will be described later.

For reference, IP-Media Customer Equipment Management System (IP-CEMS) is a system for managing an IP set-top box (IP-STB), and device information and history information of the IP set-top box 310. Manage and provide remote diagnostics and statistics.

Intrusion Prevention System (IPS) is a security solution that blocks harmful traffic caused by malware and hacking, such as Internet worms.

FIG. 7 is a diagram for describing a reception restriction system of the IPTV service system of FIG. 4.

The conditional access system (CAS) 120 is a viewer's viewing authority control system, which performs real-time encryption on a real-time channel and pre-encryption on VOD content, and authenticates by controlling viewing rights of a digital pay broadcasting. Provide IPTV service only to users.

FIG. 8 is a diagram for describing scrambling of a conditional access system and descrambling according to a smart card based control word (CW).

The conditional access system 120 performs scrambling and encryption and adds ECM and EMM to the stream. Scrambling and descrambling are performed with three pieces of information: a control word (CW), a service key, and a user key.

The control word CW is encrypted using the service key. Service keys may be common for a particular group of users, and encrypted services usually have one service key. The control word (CW) encrypted with the service key is sent once every two seconds through the ECM, and the IP set-top box descrambles with the control word.

The service key is encrypted with a user key and each user key is assigned for one user. The user key is broadcast on the EMM. The EMM is sent once every 10 seconds. The encryption algorithm used at this time is a symmetric key algorithm. When the EMM arrives, the CAS module in the IP set-top box checks if it has been sent to itself compared to the CA serial number or smart card number. If it is its own, the CAS uses its user key to decrypt the service key loaded on the EMM. The extracted service key is used to decode and extract broadcast video, audio signal, and data using a control word (CW) loaded on the ECM. The extracted control word CW is set in the descrambling hardware to perform audio / video decoding. The EMM is used for purposes such as smart card pairing, in addition to delivering a service key.

The reception restriction system 120 transmits an EMM, an ECM, and a control word (CW) to an IP multiplexer. The IP multiplexer provides broadcast video and audio signals and data broadcasting data and content signals (as described above). Table information) and encrypt the multiplexed transport stream using a scrambler according to the control word (CW). The EMM, the ECM including the control word (CW), and the service information (SI) are added to the encrypted transport stream and transmitted to the multicasting through the network switch system 190.

The conditional access system 120 encrypts broadcast video and audio signals and T-Contents according to a control word (CW), which is a key for scramble, by a scrambler of the compression multiplexing system 110.

Referring to FIG. 10, the CA 120 includes an ECM generator (ECMG), an EMM generator (EMMG), and a reportback server.

The Entitlement Control Message Generator (ECMG) generates content information (Entitlement Control Message, ECM) encrypted by the IP multiplexer of the compression multiplexing system 110 using the Content Acquisition (CA) schedule information. Create In order to generate an ECM suitable for each broadcast event or service, information referred to as an access criterion (AC) is provided to the ECM generator (ECMG), which can be changed according to a CA schedule. .

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

The Entitlement Management Messages Generator (EMMG) serves as an interface between the back office provisioning system (PVS) 130 and the subscriber's IP set-top box (STB). It receives the subscriber-related command from the back office system 130, generates an authentication stream, and transmits it in a secure form in a multicasting manner.

That is, the EMM generator (EMMG) prepares an encrypted Entitlement Management Message (EMM) packet according to a specific request from the back office system 130 and transmits it to the subscriber's IP set-top box (STB) 310. These packets can be used to authorize viewing of IPTV services, credit for purchasing Impulse Pay Per View (IPPV), broadcast mail (B-mail) and on-screen messages (OSD), cancel or reapply services, and subscriber blackout. to provide.

The reportback server receives information stored in the smart card from the set top box STB through the network system 190.

11 is a flowchart illustrating a reportback process for an IPPV purchase history from an IP set-top box.

Reportback is a report of the subscriber's IPPV purchase history to the EMM generator (EMMG) of the IPTV headend. The EMM generator (EMMG) transmits this information to the back office system (PVS) 130 to settle billing data. To provide.

Reportback information includes IPPV purchase history, viewing history, ISU subscriptions, and other information. The report includes a predefined monthly reportback date, time recorded on the card, and the number of unreported IPPV programs. When the limit is reached, when the purchase balance for the IPPV series slot exceeds the limit, when the smart card receives an immediate reportback request from the subscriber management system (SMS), and so on.

As shown in FIG. 15, the EMM generator delivers information reported back from the smart card to the provisioning system (PVS) in the set top box (STB). You can design for evenly distributed reportbacks on a daily and monthly basis.

The back office system 130 provides daily and monthly billing processing for IPTV service usage for each subscriber.

The subscriber management system 140 manages member registration and termination for IPTV service and member information.

The monitoring system 150 is a control system. The monitoring system 150 monitors an IPTV broadcast signal transmission failure and a downlink to perform a reception function such as reception failure and subtitle checking.

FIG. 9 is a diagram for describing a media management system (MOC) of the IPTV service system of FIG. 4.

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

The media management system 160 manages program organization information, content and media management information, contract information of a program provider (PP) and a content provider (CP), product information, and manages organically with each system in a central broadcasting center. It acts as a mediator that integrates and manages the information flow through consolidation.

The media management system (MOC) 160 manages contracts in terms of acquisition, manages media and content metadata, acquires / manages EPG information, which is broadcast schedule information, and provides real-time broadcasting and VoD in terms of operations. Marketing analysis reporting, delivery of CP / CA, subscriber viewing propensity, etc. in terms of channel formation management, agent management, interworking with each subsystem, VoD catalog creation management, various product management, and analysis. On the side, it provides broadcasting 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 supplementary service system 170 is an interactive data (eg, IPPV purchase history, viewing history, viewer participation data, etc.) using the unicast protocol from the T-Contents system 171 and the IP set-top box through the Internet. A return server (RS) system 172, a data broadcasting system 173, and an EPG providing system 174 that receive the received data and connect to the T-Contents system 171 to provide an interactive IPTV service. It includes.

The T-Contents system 171 is a live channel service (Video: PP, etc.) to a TV 300 connected to an IP set-top box 310 of an IPTV subscriber using a Web or IPTV client for an IPTV service. Video channel services, Audio: Music PP service), VOD service, Enhanced service (Ticker, program information, quiz / research), T-Commerce service (advertisement: interlocking advertising, DAL, banner advertising, shopping: PP Interlocked Shopping, Standalone Shopping, Finance: Home Banking via TV), T-Internet Services (Informational: Weather, Local Information, Traffic Finance, etc. Other Web, Games: Board Games, Network Games, PS2 Games, etc., Other: Karaoke , Education, telemedicine) and T-Communication services (Mail, SMS, Messenger, video telephony, VoIP, and Personal Video Recorder (PVR)).

The return server (RS) system 172 provides interactive IPTV service that receives interactive data including viewer participation data from subscriber's IP set-top boxes and provides corresponding bidirectional data to the subscriber's IP set-top box.

The EPG providing system 174 includes an EPG server and provides an electronic program guide (EPG) service to the subscriber's IP set-top box 310.

The IPTV headend system is a subscriber switch via a router 201, a metro switch (L3 switch), and an Ntopia switch (L3 switch) that support the multicast routing protocol (eg, PIM-SM protocol) of the IP premium network 200. (L3 switch) 220, the subscriber aggregation device (L2 network equipment) 230 through the IP set-top connected to the viewer TV to broadcast video and audio signals, data broadcasting data, multimedia data (T-Contents data) for IPTV service Send to box (IP STB) 310.

Broadcast video and audio signals and data transmitted from the IPTV headend system are transmitted to the IP network using multiple IP set-top boxes joined to a multicast group using an IP multicast protocol (eg, PIM-SM). Bidirectional data is transmitted over a return channel using a unicast protocol (eg, Routing Information Protocol (RIP), Open Shortest Path First (OSPF), etc.).

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

IP multicast routing protocols used in the L3 network equipment 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 (PIM-SM). Multicast routing protocols of either Multicast-Sparse Mode) or Protocol Independent Multicast-Dense Mode (PIM-DM) may be used.

In the present invention, each router, metro switch (L3 switch), N-Topia switch (L3 switch) of the backbone network / access network / subscriber network (N-Topia: using high-speed Internet through LAN equipment installed in a group building where UTP is installed) Service), a subscriber switch (L3 switch) 220 uses a PIM-SM multicast routing protocol for Layer 3 network equipment, and the subscriber network equipment (IP STB) and subscriber concentrator 230 are IGMP, and IGMP Use the snooping protocol.

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

The Layer 3 network equipment includes a router, a metro switch (L3 switch), an N-Topia switch (L3 switch), and a subscriber switch (L3 switch), and each uses a PIM-SM multicast routing protocol.

The IGMP Snooping protocol is a protocol that runs on Layer 2 network equipment (eg subscriber concentrator 230) located between an IP set-top box terminal requesting channel selection / release and a Layer 3 network device that accepts this request. The protocol-driven Layer 2 network equipment (subscriber concentrator 230) recognizes an IGMP transmission / reception message between the IP STB terminal and the Layer 3 network equipment, and transmits channel information only to the subscriber IP set-top box that has made a channel request.

The PIM-SM multicast routing protocol is the most commonly used protocol when the first Layer 3 network device receiving a channel selection / release request from the IP STB terminal using the IGMP protocol transmits this request to the upper routers. Protocol. In addition, PIM (Protocol Independent Protocol) performs multicast routing, traffic management, and control to transmit IP packets sent from IPTV headend systems to subscriber set-top boxes by multicasting.

The IP premium network 200 is used as a broadband IP backbone network for IPTV services, and is higher than Gigabit using a preset IP multicast routing protocol (eg, PIM-SM: Protocol Independent Multicast-Sparase Mode). Each router having a bandwidth (Ultra Bandwidth) is used, and the PIM-SM protocol is mounted in the Layer 3 network equipment including the Metro switch, the N-Topia switch, and the subscriber switch 220, and is transmitted from the IPTV headend system. IP packetized streams containing broadcast video and audio signals, data broadcast data and content signals, are multi-part IGMP-joined from the subscriber's IP set-top box by IP multicasting via a multicast tree by a core router (RP). Send to subscriber IP set-top boxes in the cast group.

The core router (RP: Rendezvous Point) manages the PIM Join list and the PIM Prune list for each broadcast channel (eg, 100).

In one embodiment, all routers of the IP premium network 200 are multicast configured according to an IGMP-joined multicast group in the viewer's IP set-top box 310 when the PIM-SM multicast routing protocol daemon is installed. Multicast Tree transmits broadcast video, audio signals, and data through IP multicasting.

The multicast tree for the PIM-SM multicast routing protocol is a source-based tree that delivers information using a router connected to a transmitting terminal as a root, or the IP premium network 200. A core router in the s) is selected as the root of the shared tree (Rendezvous Point, RP) so that all source hosts contain all multicast information requests and multicast information. The multicast traffic is transmitted to a selected route (RP: rendezvous point), and the selected route (RP) transmits multicast information to terminals joined to a multicast group through a shared tree. Use a core-based tree.

Building a source-based tree (such as a SPT: Shotest Path Distrbution Tree) is most effective by using (S, G) entries (but S: Source address, G: Multicast Group) in the outgoing interface list. Although multicast information can be delivered, the network burden is increased because all routers in the network must store and manage all multicast information in a routing table.

Core-based tree uses (*, G) entry (G: Multicast Group) in the outgoing interface list to manage all the multicast group information only for core router (RP: Rendezvous Point) and other routers It is effective because it manages the direction of router (RP: rendezvous point) and multicast information currently requested by neighboring routers because there is not much management information.

The IP STB 310 of the subscriber uses a designated router (DR) (eg, a subscriber switch 220) in a section in which an IGMP join message is TTL = 1 using the IGMP and IGMP Snooping protocols used. It joins a multicast group (broadcast channel) and sends an IGMP leave message to the designated router (DR) (eg, subscriber switch 220) to unsubscribe from the multicast group (broadcast channel).

Subsequently, the designated router DR (eg, the subscriber switch 220) joins the PIM Join message to a multicast group managed by the rendezvous point RP of the IP premium network 200 (Explicit Join), In order to terminate the connection, the PIM Prune message is sent to the core router (RP: Rendezvous Point) to leave the multicast group.

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. 13A illustrates PIM-SM multicast routing according to an IGMP Join / Leave message in a subscriber set-top box according to a first embodiment of the present invention.

IP Multicasting protocol should be JOINed to multicast group so that traffic can be transmitted and received for the group. In IPTV, each multicast group corresponds to each broadcast channel, and joining a multicast group by a subscriber set-top box (IP STB) means selecting and receiving a channel. In order for a subscriber set-top box (STB) joined to a group (channel) to receive broadcast traffic, the set-top box (STB) must first join a group (eg, group 1). If there are multiple routers between the rendezvous point (RP) and the set-top box (STB) of the IPTV headend, they must all be joined to group 1. If the router (L3 switch) between the rendezvous point (RP) and the set-top box (STB) is not currently subscribed to the group, the group (channel) subscription order is as follows.

When the IP set-top box (STB) joins the group 1, the IP set-top box of the subscriber requesting to join the channel transmits an IGMP Join message to the router 3 (eg, the subscriber switch 220) through the subscriber aggregation device 230. . The router 3 (subscriber switch) transmits a PIM Join message for requesting to join the group 1 to the router 2 (Ntopia switch) when the IP set-top box of the subscriber is not subscribed to the group 1. Router 2 (Ntopia Switch) sends a PIM Join message for request to join Group 1 to Router 1 (Metro Switch) when Router 2 (Ntopia Switch) is not subscribed to Group 1. Router 1 (Metro Switch) sends a PIM Join message to the Rendezvous Point (RP) if it is not joined to Group 1. The rendezvous point RP adds a group for the requested broadcast channel of the subscriber station receiving the PIM Join message and updates the join list.

When the subscriber's IP set-top box (STB) terminates group 1 join (change to another channel in case of IPTV, the subscriber STB sends IGMP Group Leave message), and transmit to router 3 (L3 switch: subscriber switch), router 3 , 2,1 will leave group 1 in turn.

Since many routers (L3 network equipment) on the network between the rendezvous point (RP) and the set-top box (STB) are involved, it takes a lot of time in the final group (broadcast channel) join procedure.

The channel switching speed in IPTV should be within 2 seconds including A / V decoding in the set top box (STB). In the group joining procedure of FIG. Since all of them pass through, the channel change time is increased to about 5 seconds.

In order to solve this problem in the IPTV network according to the present invention, as shown in Figure 13b uses a static join method. FIG. 13B is a diagram for describing static join in order to reduce a number of broadcast channel zapping times in a subscriber set top box (STB) according to a second embodiment of the present invention.

The static join method is the same as the subscriber set-top box (STB) joining all groups (channels) in router 3 (subscriber switch 220), and the upper L3 network equipment (router 3,2,1) (subscriber switch, Ntopia). Switch, metro switch, and rendezvous point (RP). As a result, traffic from all broadcast channels (e.g. 100 channels) is downloaded to router 3 (subscriber switch 220), and subscriber switches (router 3) 220 periodically to maintain these groups. Send join message to upper L3 network equipment (Ntopia switch, Metro switch, Rendezvous View Point). The cycle occurs within 128 seconds of the end of the group joining time to maintain the group (broadcast channel) continuously.

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 Switch) always maintain Join in all multicast groups (all broadcast channels) regardless of the IGMP Leave message of the subscriber set top box (STB).

For example, a designated router (DR: subscriber switch) receives an IGMP Leave message for a Group 1 exit from a subscriber's IP set-top box, but prune messages to upper L3 network equipment (Ntopia switch, Metro switch, rendezvous point). May not transmit.

Thus, a large amount of channel traffic of all broadcast channels (eg, 100 channels) of the IPTV headend system reaches the subscriber switch (Router 3) 220.

FIG. 14 is a diagram illustrating Ntopia of UTP (Untwisted Pair) method (service using high-speed Internet through LAN equipment installed in a group building where UTP is installed), ADSL, VDSL, and a telephone line according to another embodiment of the present invention. It is a figure which shows the network of FTTH (Fiber To The Home) system.

Access network connected to the IP network (IP premium network) 200 (Access Network) is Ethernet (Ethernet), xDSL (ADSL, VDSL), HFC (Hybrid Fiber Coaxial), FTTC (Fiber To The Curb) It can be used as either IP network or FTTH (Fiber To The Home) network.

The Metro Switch (L3 Switch) is a device that incorporates the PIM-SM multicast routing protocol and aggregates Ntopia switch lines.

The Ntopia switch (L3 switch) is a device that incorporates the PIM-SM multicast routing protocol and aggregates traffic from Layer 3 (L3).

Subscriber switch 220 is a L3 (Layer 3) network equipment equipped with a PIM-SM multicast routing protocol, and is a device that aggregates traffic generated in Layer2.

The subscriber concentrator 230 is a device for managing traffic generated in the IP STB of the Layer 1 subscriber as Layer 2 (L2) equipment.

Passive Optical Network-Optical Line Termination (PON-OLT) is a telephone station equipment for passive optical network (PON) transmission.

Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) is a technology that applies wavelength division multiplexing technology to optical subscribers.

Splitters are devices that distribute and combine light wavelengths.

FES is a Fast Ethernet Switch with 100Mbps data rate.

The IPTV subscriber station includes an IP set top box (IP ACAP STB) used as a subscriber network equipment and a TV connected to the IP set top box.

15 is a flowchart illustrating a method of receiving content and data from an IPTV service system in an IP set-top box.

The web browser or client for the IPTV service installed in the subscriber's IP set-top box (STB) 310 inputs the member information for the IPTV service from the user of the TV connected to the IP set-top box (STB) (step S10). Information is transmitted to the IPTV service system (step S11).

The IPTV service menu screen can be serviced using an electronic program guide (EPG) of any one of Box List EPG, Text EPG, Mosaic EPG, Mini EPG, and Navigator EPG.

When the viewer selects a specific IPTV service using an electronic program guide (EPG), the viewer requests an IDTV and a password for using the selected IPTV service for user authentication (step S12).

If the user is authenticated (step S13), the web browser or client providing the IPTV service accesses the IPTV service system and receives data related to the corresponding IPTV service through the IP network (step S14), and receives from the corresponding channel. The decoded broadcast video and audio signal, data and content signal are descrambled, demultiplexed and A / V decoded and output to the IPTV screen (step S15).

The IP set-top box (STB) 310 receives broadcast video and audio signals, data broadcasting data, and content signals through a high-speed Internet network, and includes a microchip (Entitlement Management Medssage: Encrypted Subscriber Information). Check the service purchased by the subscriber through the received encrypted subscriber information (EMM) of the smart card (chip) embedded, and if the service subscription is confirmed, the control word extracted from the encrypted content information (ECM) (CW) descrambles the broadcast video, audio signal, data broadcast data and content signal received by the descrambler, and demultiplexes and A / V decodes the output to the IPTV screen.

When bi-directional data is input from the subscriber through the IPTV set-top box (STB) 310, the bi-directional data (eg, viewer participation data) is transmitted to the IPTV service system via the return server (RS) system 172 through a return channel. (Step S16).

The web browser or client for the IPTV service receives response data corresponding thereto based on the bidirectional data from the IPTV service system (step S17).

When the user clicks the end button (step S18), the reception of the selected IPTV service is terminated, the IPTV service use time information is transmitted, and the original broadcast signal is continuously received (step S19).

As described above, 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.

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.

In the above-described embodiment, a conditional access system (CAS) 120 is used to prevent illegal copying of IPTV contents, but a digital rights management (DRM) scheme may be used instead. .

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As described above, the IPTV service system and the network, content and data transmission and reception method according to the present invention, based on the ACAP (Advanced Common Application Platform) standard of the IPTV service, IP set-top box from the IPTV headend system through the high-speed Internet network While watching a broadcast signal on a broadcast channel selected by a key input unit or a remote controller through a television (TV) connected to the STB, there is an effect of providing an interactive IPTV service.

In addition, while watching broadcast signals of channels tuned from a terrestrial IPTV headend system to a television (TV) connected to an IP set-top box (STB) through a high-speed Internet network, the user can use the remote control or the key input of the television to guide the electronic program. (EPG) selects the desired program and then authenticates the user to watch movies, dramas, news, sports, etc., at the same time, retrieves Internet information of TV-content, watching movies by T-VOD, home shopping by T-Commerce, and T -It is effective in providing two-way IPTV application service by providing various internet contents such as home banking, online game, MP3 music listening, and T-Communication service by banking.

Claims (32)

In the IPTV service system, 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; Compress and stream the broadcast video and audio signals received from the baseband system for each channel, multiplex the streamed broadcast video and audio signals with data and data signals for data broadcasting, and then packetize the multiplexed streams with IP packets. Compression multiplexing system for outputting; A network switch system for transmitting the IP packetized transport stream received from the compression multiplexing system to a subscriber terminal through an IP network in a multicast manner; And A return server (RS) system connected to the subscriber station via a IP network in a return channel and receiving bidirectional data from the subscriber station in an unicasting manner for interactive service; IPTV service system comprising a. The method according to claim 1, The subscriber station, the IP set-top box, a computer, a laptop, a personal portable terminal, a mobile communication terminal connected to a TV or a user's TV, characterized in that the IPTV service system. delete The method according to claim 1, The compression multiplexing system, IPTV service system, characterized in that for streaming the broadcast video and audio signals in the MPEG-2 TS method. 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 transport stream to multicast by an IP network; At least one L4 switch (L4 SW) for connecting the return server system to the subscriber's terminal and load balancing the bidirectional data receiving traffic in a unicasting manner between the return server systems and the loads; And One or more intrusion prevention systems for blocking harmful traffic between the L4 switch and an IP network; IPTV service system comprising a. The method according to claim 1, An IPTV service system further comprising an IP-Media Customer Equipment Management System (IP_CEMS) that manages device information and history information of a subscriber station and provides remote diagnosis and statistical functions. The method according to claim 1, Membership and termination for IPTV services, IPTV service system further comprising a subscriber management system for managing member information. The method according to claim 1, An IPTV service system further comprising a back office system for billing the use of IPTV service for each subscriber. The method according to claim 1, IPTV service system further comprising a monitoring system for monitoring the downlink associated with the IPTV service to monitor the transmission or reception failure. The method according to claim 1, IPTV service system further comprising a media management system (MOC) for managing program provider information of the program provider or terrestrial, contract information of the content provider (CP). The method according to claim 1, In order to prevent illegal viewing and illegal mass duplication, the system further includes a reception restriction system for restricting the reception to authorized users by performing encryption of the broadcast video and audio signals and pre-encryption of the contents to control viewing rights. IPTV service system. The method according to claim 12, The reception restriction system, An IPTV service system, characterized by scrambled broadcast video and audio signals for each channel by a scrambler. The method according to claim 12, The reception restriction system, An ECM generator for generating encrypted content information (Entitlement Control Message, ECM) using Contents Acquisition (CA) schedule information; An EMM generator for providing an interface between a back office system and a subscriber terminal, generating an authentication stream according to a specific request from the back office system, and transmitting an encrypted subscriber information message (EMM) to the subscriber terminal. ; And A reportback server for receiving a reportback from the subscriber's terminal through the return server system and transmitting the reportback to the backoffice system to settle billing data; IPTV service system comprising a. The method according to claim 1, And an additional service system for providing the interactive service in a unicasting manner in response to a request from a subscriber station received through the return server system. The method according to claim 15, The supplementary service system includes 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) to the subscriber station; And A T-Contents system for providing contents for an IPTV service to the subscriber terminal; IPTV service system comprising a. The method according to claim 1, The subscriber station, Hardware layer consisting of CPU, media processor, flash RAM, STB hardware with Ethernet modules, system software layer with device drivers and operating system, Java Virtual Machine (JVM), Conditional Access System (CAS) and digital Digital Rights Management (DRM) interface module, middleware layer with streaming protocols (RTP, RTSP), electronic program guide (EPG), web browser for selecting various IPTV service channels with support for various multi-codecs Or an IPTV service system including an application layer including a client. The method according to claim 17, In the multi codec, IPTV service system characterized in that the MPEG2, MPEG4, MPEG7, H.264, WMV-9 codec is included. In the IPTV service network, Gigabit or higher broadband IP network for IPTV service, including L3 network equipment using IP multicast routing protocol, IP packetization including broadcast video and audio signals and data signals transmitted from IPTV headend system A premium network for transmitting the stream in a multicast manner; And A subscriber network including an L2 network equipment and connecting the premium network with the subscriber's terminals; IPTV service network comprising a. The method according to claim 19, The subscriber network, IPTV service network comprising one of Ethernet, xDSL (ADSL, VDSL), Hybrid Fiber Coaxial (HFC), Fiber To The Curb (FTTC), and Fiber To The Home (FTTH) architecture . The method according to claim 19, The L3 network equipment used for the premium network uses a Protocol Independent Multicast-Sparse Mode (PIM-SM) multicast routing protocol, and the subscriber station uses an IGMP Join / Leave message for selecting / deselecting a broadcast channel. The L2 network equipment of the subscriber network uses the IGMP Snooping protocol to recognize the IGMP transmission and reception messages of the terminal of the subscriber making a channel request. The method according to claim 19, In order to reduce the channel zapping time at the subscriber's terminal, the designated router (DR) of the premium network connected to the subscriber network receives traffic of all broadcast channels by requesting join to the upper L3 network equipment for all multicast groups. IPTV service network. The method according to claim 22, The designated router (DR) periodically transmits a Join message to the upper L3 network equipment to continuously join all broadcast channels, characterized in that the IPTV service network. The method according to claim 23, The designated router does not transmit the prune message to the upper L3 network device even if the subscriber receives the IGMP Leave message from the terminal. The method according to claim 19, The premium network, The IP packetized stream is transmitted from the IPTV headend system to the subscriber's terminals using the IP multicast routing protocol, and bidirectional data transmitted from the subscriber's terminals is transmitted through a return channel using a unicast protocol. IPTV service network, characterized in that the transmission to the IPTV headend system. In the method for transmitting content and data in an IPTV service system, (a) receiving a broadcast signal from a program provider (PP) or terrestrial wave and synchronizing the frames for each broadcast channel by the baseband system, and centralizing and outputting the broadcast signals; (b) receiving and compressing the broadcast video and audio signals provided from the baseband system by a compression multiplexing system, compressing the streamed broadcast video and audio signals, and multiplexing the streamed broadcast video and audio signals and data broadcasting data and content signals; (c) IP packetizing the multiplexed transport streams and transmitting the multiplexed transport streams to a plurality of subscriber stations in a multicast manner through an IP network; And (d) receiving interactive data from a subscriber's terminal to a return server (RS) system through a return channel; Method of transmitting content and data in the IPTV service system comprising a. The method of claim 26, In step (a), And inserting at least one of an advertisement, a logo, and a subtitle into the broadcast video and audio signal. delete The method of claim 26, In step (b), The broadcast video and audio signals are streamed by the MPEG-2 TS method. The method of claim 26, Between step (b) and step (c), (b1) Restriction of receiving broadcast video and audio signals, data broadcasting data and content signals by performing encryption on the broadcast video and audio signals, data broadcasting data and content signals, and controlling the viewing authority. step Method for transmitting content and data in the IPTV service system further comprising. A method for receiving content and data at an IPTV subscriber terminal connected to an IPTV service system, (a) receiving, by a client for an IPTV service installed in an IPTV subscriber terminal, member information for an IPTV service, and transmitting the member information to an IPTV service system; (b) if a specific IPTV service is selected using an electronic program guide (EPG), requesting an ID and password for using the selected IPTV service for user authentication; (c) if the user is authenticated in step (b), receiving and outputting a broadcast video and audio signal, a data broadcast data, and a content signal received from a corresponding channel from an IPTV service system through an IP network; (d) when bidirectional data is input from the subscriber, transmitting the bidirectional data to the IPTV service system via a return server (RS) system through a return channel; (e) receiving corresponding response data from the IPTV service system based on the bidirectional data; And (f) if the user clicks the end button, ending reception of the selected service; Method for receiving content and data in the IPTV subscriber terminal connected to the IPTV service system comprising a. IP set-top box (IP STB) or computer or personal digital assistant (a) receiving member information for an IPTV service from a user and transmitting the member information to an IPTV service system; (b) if a specific IPTV service is selected using an electronic program guide (EPG), requesting an ID and password for using the selected IPTV service for user authentication; (c) a function of accessing an IPTV service system and receiving broadcast video and audio signals, data broadcast data and content signals received from a corresponding channel through an IP network and outputting the data to a screen when the user is authenticated in step (b); (d) transmitting bidirectional data to the IPTV service system via a return server (RS) system through a return channel when bidirectional data is input from a subscriber; (e) receiving corresponding response data from an IPTV service system based on the bidirectional data; And (f) ending the reception of the selected service when the user clicks the end button; 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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