KR20040014139A - High definition television quality guaranteed multimedia service method and communication system therefor - Google Patents

Abstract

PURPOSE: A method for a high definition television multimedia service and a communication system therefor are provided to realize an HDTV digital broadcasting service by using the existing telephone line. CONSTITUTION: A set-top box(34) which is a client terminal device of a subscriber premise(32) provides network access to a set-top box user through a VDSL(Very high-data rate Digital Subscriber Line)(30). A service provider(10) provides HDTV(High Definition Television) multimedia service programs to the set-top box, and includes a zapping server(18). The service provider accepts an HDTV multimedia service request signal to a channel requested by the set-top box user by the zapping server, responses to the set-top box, and provides an HDTV multimedia service program of the channel requested by the client set-top box user among the HDTV multimedia service programs. An access network(20) is connected between the service provider and the set-top box for providing a communication path between the service provider and the set-top box so that the set-top box receives the HDTV multimedia service program through the VDSL.

Description

High-definition TV-class multimedia service method and communication system for the same

The present invention relates to a multimedia service, and more particularly, to a method and apparatus for providing a high definition television (HDTV) class multimedia service.

Recently, the number of Internet users is exploding due to the development of high-speed Internet services such as cable modem and Asynchronous Digital Subscriber Line (ADSL). As the desire for participation of individual users increases, participation in interactive Internet services, which is one step further from one-way Internet services, is gradually increasing. In addition, service users tend to want HDTV-class multimedia services such as HDTV viewing, HDTV-level video on demand, program selection through the web, and digital camera broadcasting.

Video on Demand (VoD) service, which is a kind of multimedia service, requires a large bandwidth due to the nature of multimedia data, and thus is actively performed in a limited environment such as a hotel or an airplane. In the case of hotels and cabins, the distance between the VoD server and individual users is short, so the service method is mainly using a private line. This VoD service method has a disadvantage in that a lot of additional costs are generated such as the installation of a dedicated line for securing a large bandwidth due to the nature of multimedia data to perform a VoD service between a service provider and a general user.

Another form of VoD service is a VoD service over the Internet using a cable modem or ADSL. However, VoD service through the Internet is not sufficient to provide a good quality VoD service due to the problems of IP (Internet Protocol) which cannot guarantee the quality of service (QoS) and bandwidth security of the transmission network. As a result, the connection is frequently lost during VoD service through the Internet, and it is not easy to provide a high quality screen.

Korean Patent Publication No. 1999-58089 (name of the invention: a transmission apparatus for providing a multi-service) discloses a subscriber transmission apparatus for providing a multimedia service. However, even in Patent Publication No. 1999-58089, HDTV-class multimedia services such as HDTV viewing and HDTV-class VoD are impossible.

Accordingly, an object of the present invention is to provide a method for HDTV-class multimedia services such as HDTV watching and HDTV-class VoD, and a communication system for the same.

Another object of the present invention is to provide a method for providing HDTV-class VoD service using VDSL technology and a communication system for the same.

Another object of the present invention is to provide a method for providing a HDTV viewing service using VDSL technology and a communication system for the same.

In accordance with the above object, the present invention is a communication system for a high definition television (HDTV) -class multimedia service, the client terminal device in the subscriber's home to provide network access through the subscriber line to the terminal user; It supplies HDTV-class multimedia service programs that can be provided to the client terminal device, and includes a zapping server, and accepts the HDTV-class multimedia service request signal for a channel requested by the user of the client terminal device by the zapping server. A service provider that responds to a client terminal device and provides an HDTV-class multimedia service program of a channel requested by the user of the client terminal device among the supplied HDTV-class multimedia service programs, the service provider and the client terminal manager It is connected between, characterized in that the client terminal is configured with the subscriber line to an access network which provides a communication path between the service provider and the client terminal to receive the HDTV-class multimedia service programs.

In addition, the present invention, in the communication system for high-definition television (HDTV) -class multimedia service, the subscriber home that provides a terminal user with network access through a VDSL (Very-high-data-rate Digital Subscriber Line) And a multimedia service supply device for supplying HDTV-class multimedia service programs including HDTV broadcasting programs and HDTV-grade video on demand content programs, and HDTV for a channel requested by the client terminal user. Accepts a multimedia multimedia service request signal, responds to the client terminal device, and provides an HDTV-class multimedia service program of a channel requested by the user of the client terminal device among the HDTV-class multimedia service programs supplied by the multimedia service supply device. Zapping And a communication path between the zapping server and the client terminal device, the communication terminal being connected between the server and the client terminal device so that the client terminal device can receive the HDTV-class multimedia service program through the VDSL. And an access network.

In addition, the present invention provides a service provider for providing high definition television (HDTV) -class multimedia service programs and Internet access services to a user in a client terminal device of a subscriber, and a VDSL connected to the service provider with an optical cable. A method for a high-definition television-class multimedia service in a communication system having an access network connected to a very-high-data-rate digital subscriber line, the method being defined as a channel protocol between the service provider and the client terminal device. There is a process of transmitting program guide information for the HDTV-class multimedia service from the service provider to the client terminal device while sending and receiving a message, and requesting a program selection from the client terminal device based on the program guide information. Surface characterized by the service provider yirueojim the HDTV service-class multimedia service program in the selection request the multimedia service-level HDTV program of which the step of transmitting to the client terminal via the access network and VDSL.

The present invention also provides a service supply device for supplying high definition television (HDTV) -class multimedia service programs to a subscriber indoor client terminal user, and accepts an HDTV-class multimedia service request signal for a channel requested by the client terminal user. A zapping server that responds to the client terminal device and provides an HDTV-class multimedia service program of a channel requested by the user of the client terminal device among the HDTV-class multimedia service programs supplied by the multimedia service supply device; A method for a high-definition television-class multimedia service in a communication system having an access network connected to an optical cable and connected to a client high-data-rate digital subscriber line (VDSL) After the client terminal device transmits a client session setup request message to the zapping server, the zapping server confirms the subscriber registration from the client session setup request message in response to the client session setup request message. The zapping server provides the client session setup confirmation message including the video program guide information that can be provided to the client terminal device, and the program selected by the client terminal user's channel change request after the session setting is provided by the zapping server. Transmitting, by the client terminal device, a program selection request message for requesting to give to the zapping server; and the zapping server receiving the program selection request message is selected through the service supply device. Confirming whether the program can be transmitted, and transmitting a program selection confirmation message to the client terminal device in response to whether the selected program can be transmitted.

1 is a configuration of a communication system for a high-definition television-class multimedia service using the VDSL technology according to an embodiment of the present invention,

2 is a basic channel 채널 protocol diagram according to an embodiment of the present invention;

3 is a diagram illustrating a message flow such as session control and channel change performed through a channel shock protocol according to an embodiment of the present invention;

4 is a diagram illustrating information included in a message such as a session control and a channel change.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Fiber to the Home (FTTH) technology is the best choice for HDTV-class multimedia services such as HDTV viewing and VoD services that require high bandwidth (high bit rate). That is, to install the optical cable to the home. However, there are still a lot of problems when considering the cost side to distribute the optical cable to the home.

The optimal solution to this is the very high rate DSL (VDSL) technology that will be provided by full-scale services in the future. One of the high-speed Internet service technologies, DSL (Digital Subscriber Line (ADSL, VDSL, SDSL, etc.)) technology, HDTV-class multimedia services such as HDTV viewing and HDTV-class VoD service is possible VDSL (Very high bit rate DSL) technology. VDSL technology is weaker in terms of transmission distance than ADSL (Asymmetric DSL), which is the most widely used DSL technology, but HDTV is required to watch high bandwidth because it provides excellent transmission rate in short distance of 500m (300m ~ 1.5km). And HDTV-class multimedia services such as HDTV-class VoD are possible. In short, VDSL technology is an asymmetric data communication method that has a data transmission speed of 3,4 times faster than the existing ADSL, and is suitable for high-capacity content transmission services such as high-definition VoD, real-time video chat, and Internet broadcasting. In addition, since the existing general telephone line is used, the installation is simple without a separate facility, and there is an advantage of using voice call and internet communication at the same time.

In an embodiment of the present invention, the optical cable is installed up to an optical network unit (ONU) located near a home or a company and is connected to a service provider through an ATM switch. It uses a communication system that transmits data over the air and services through the VDSL using a telephone line from the ONU to each subscriber in the home or company.

In order to provide HDTV-class multimedia services such as HDTV viewing and HDTV-grade VoD services that require high bandwidth using VDSL technology according to an embodiment of the present invention, the first solution is to change a channel or select a channel. It is necessary to implement a function of accepting and responding to a multimedia service request signal. The reason is as follows. All HDTV-class multimedia service programs, such as 1.6 Gbps (giga bit per second), are transmitted from a server that provides HDTV-class multimedia service programs through an optical cable connected from a host digital terminal (HDT) connected to a service provider to an ONU. Class multimedia service programs can be accommodated and delivered to the ONU. Each channel bandwidth of the HDTV-class multimedia service programs is approximately 2OMbps (mega bit per second). However, HDTV-class multimedia programs can be transmitted with only one channel of bandwidth from ONU to each subscriber in the home or company through VDSL using a telephone line. This is because the maximum bandwidth of the VDSL is approximately 40 Mbps, which is slightly larger than one channel bandwidth (approximately 20 Mbps) of HDTV-class multimedia service programs, and the actual bandwidth is about 30 Mbps.

For this reason, in order to provide HDTV-class multimedia services such as HDTV viewing and HDTV-grade VoD services that require high bandwidth using VDSL technology, a zapping server is provided in a service provider. And a protocol including a function of accepting and responding to a multimedia service request request such as channel change and channel selection between the zapping server and the client. Then, the zapping server can deliver HDTV-class multimedia programs of the channel selected by the user to the client.

1 is a configuration diagram of a communication system for HDTV-class multimedia service using VDSL technology according to an embodiment of the present invention.

Referring to FIG. 1, a communication system 100 for a HDTV-class multimedia service using VDSL technology includes a service provider 10 including a zapping server 18 provided according to an embodiment of the present invention. And a subscriber home 32 with a network 20 and a settop box (hereinafter referred to as " STB ") 34 serving as a client.

The service provider 10 is divided into a DTV (Digital Television) broadcasting encoding apparatus 12, a VoD server 14, a web server 16, and a service supply device and a zapping server 18. The service supply device provides HDTV broadcasting, VoD service, and Internet access service to STB 34 users who are clients in subscriber home 32. The DTV encoding encoder 12 receives an analog broadcast signal such as a CATV (cable television) broadcast, encodes the MPEG signal, converts the signal into a SDTV (standard definition television) -class moving picture expert group (MEPG) transport stream (TS), and terrestrial HDTV. It receives a broadcast signal or cable HDTV broadcast signal, converts it into HDTV-class MPEG TS, and provides the same to the zapping server 18. The VoD server 14 stores HDTV-class VoD content, and provides the MPEG TS of the content according to the VoD service request of the STB 34 in the subscriber's home 32 to the zapping server 18. A web server 16, commonly called a remote access server, is an IP (Internet Protocol) address for connecting the STB 34 to the Internet 12 according to the Internet access request of the user of the STB 34 in the subscriber's home 32. Assignment and authentication services. The zapping server 18 accepts a request signal for the user's multimedia service request, such as changing a channel or selecting a channel of the STB 34 in the subscriber's home 32, and performs a function of giving a response to the STB 34 as a client. In addition, the HDB-class multimedia service program of the channel requested by the STB 34 is received from the DTV encoding apparatus 12 or the VoD server 14 and transmitted to the STB 34.

The subscriber's home 32 is provided with a client STB 34 and a TV 36 connected to the STB 34. The TV 36 may be an HDTV capable of receiving HDTV-class multimedia services such as HDTV broadcasting or HDTV-class VoD content.

The access network 20 is located between the service provider 10 and the subscriber's home 32 and is connected to the service provider 10 with an optical cable and to the VDSL 30 to the STB 34 in the subscriber's home 32. Connected to provide a communication path between the service provider 10 and the STB 34 in the subscriber's home 32 so that users can receive HDTV broadcast programs and HDTV-class VoD content programs through the VDSL 30 and access the Internet. . The access network 20 is an example of using an Asynchronous Transfer Mode-Passive Optical Network (ATM-PON), and the ATM switch 22 and a plurality of Host Digital Terminals (HDTs) 24 which are optical subscriber devices. (Referred to as OLT (Optical Line Terminal) in ATM-PON), a plurality of ONU (Optical Network Unit) 28 is provided. The ONUs 28 are connected to the HDT 24 by an optical cable and to the STB 34 in the subscriber's home 32 by the VDSL 30 to provide an interface between the optical cable and the VDSL 30. The HDTs 24 are optically connected to the ATM switch 22 and the ONUs 28 and receive uplink signals transmitted from the STB 34 in the subscriber's home 32 to the service provider 10 via the ONUs 28. Multiplexes and demultiplexes the downlink signals transmitted from the service provider 10 to the STB 34 in the subscriber's home 32 and transmits them through the ONUs 28. The ATM switch 22 is connected to the zapping server 18 and the web server 16 of the service provider 10 by an optical cable, and the HDTV broadcasting program of the selected channel is selected based on the switch control signal SWC of the zapping server 18. The MPEG TS of the HDTV-class VoD content program is transmitted as an ATM cell to the STB 34 in the subscriber's home 32 through the HDT 24, and the STB corresponding to the Internet access of the user of the STB 34 in the subscriber's home 32 Provide communication between the 34 and the web server 16;

The ONUs 28 are spaced apart from the subscriber's home 32 when the subscriber's home 32 is a general home, but is located in the subscriber's home 32 in the case of a hospital, a hotel, a company, a broadcaster, and the like. The HDTs 24 and the ONUs 28 are also connected to one another, for example 2.5 Gbps optical cables, spaced apart by several kilometers, and the ONUs 28 and the STB 34 of the subscriber's home 32 are, for example, downwards. It is connected to the VDSL 120 of 36Mbps, 3.6Mbps up to 300m apart.

In an embodiment of the present invention, a part to be solved in order to provide an HDTV-class multimedia service using VDSL technology is to implement a function of accepting and responding to a signal related to a service request such as a session control or a channel change. The session control is necessary for setting synchronization for sending and receiving messages between ends and controlling synchronization to send and receive data.

In the embodiment of the present invention, the service provider 10 includes a zapping server 18 for this function. The STB 34 serving as a client and the zapping server 18 send and receive messages defined by the channel protocol according to an embodiment of the present invention, and provide program guide information for HDTV-class broadcasting and program guide for HDTV-class VoD contents. Information is sent from the zapping server 18 to the STB 34. When the client STB 34 requests, the zapping server 18 sends a switch control signal SWC to the ATM switch 22 of the access network 20 to obtain a VPI / VCI (Virtual Path Identifier / Virtual Channel Identifier) value. By adjusting the channel, the STB 34 receives the HDTV-class multimedia service program of the desired channel from the DTV broadcast encoder 12 or the VoD server 14 and transmits it to the STB 34 through the access network 20.

2 is a diagram illustrating a basic channel 채널 protocol according to an exemplary embodiment of the present invention, and FIG. 3 is a diagram illustrating a message flow such as a session control and a channel change performed through the channel 잽 protocol according to an exemplary embodiment of the present invention. FIG. 4 is a diagram illustrating information included in a message such as session control and channel change.

First, the basic channel 2 protocol according to an embodiment of the present invention will be described in detail with reference to FIG. 2. The STB 34, which is a client, initially transmits a client identifier message including its ID to the zapping server 18 through a control channel. Accordingly, after the zapping server 18 performs an authentication operation, the zapping server 18 transmits the service guide message in service to the corresponding STB 34 through the control channel. When the user of the STB 34 selects a desired program, the STB 34 transmits information about the selected program, that is, a program selection message, to the zapping server 18 through the control channel. When the zapping server 18 receives the program selection message, the zapping server 18 transmits a response message to the corresponding STB 34 through the control channel. The zapping server 18 then delivers one channel of the HDTV-class multimedia service program, that is, the HDTV-class program selected by the user, to the STB 34 through the video channel.

As described above, while the zapping server 18 and the client STB 34 send and receive messages defined by the channel protocol, the zapping server 18 accesses only the HDTV-class multimedia program selected by the user or the like. By transmitting to the STB 34 through the 30, the HDTV-class multimedia program can be passed to the STB 34 through the VDSL 30 allowing only one channel of HDTV-class multimedia service program. .

Referring to Figures 3 and 4, it will be described in more detail the flow of messages, such as session control and channel change in more detail. First, description will be given of the state control.

1) Shation Control

Referring to FIG. 3, the STB 34 sends a ClientSessionSetupRequest message to the zapping server 18 to establish a session. As shown in FIG. 4, the ClientSessionSetupRequest message includes a session ID, a reserved client ID, and a server ID. The server ID is an ID indicating the zapping server 18. Accordingly, the zapping server 18 confirms the subscriber registration from the received ClientSessionSetupRequest message and then transmits a ClientSessionSetupConfirm message including the video program guide information that can be provided to the user to the STB 34. As shown in FIG. 4, the ClientSessionSetupConfirm message includes a session ID, a server ID, and the like. When the ClientSessionSetupConfirm message is received, the session setup is completed.

In the state where the session is set, the STB 34 repeats the channel changing process from time to time with the zapping server 18 whenever a user requests to change the channel. The channel change process will be described in detail in the following "2) Channel change" section.

The zapping server 18 periodically sends a ServerStatusRequest message to the STB 34 to inquire about the status of the STB 34. The STB 34 sends a ServerStatusConfirm message to the zapping server 18 in response to receiving the ServerStatusRequest message.

At the end of the STB, the STB 34 sends a ClientReleaseRequest message to the zapping server 18. The zapping server 18 confirms the termination of the corresponding STB 34 through the received ClientReleaseRequest message, and transmits a ClientReleaseConfirm message to the STB 34 in response to receiving the ClientReleaseRequest message.

2) Change Channel

2-1) When STB 34 Requests Channel Change

The client STB 34 sends a ProgramSelectRequest message to request that the zapping server 18 provide the program selected by the user's channel change request. As shown in FIG. 4, the ProgramSelectRequest message includes a session ID and a reserved broadcast program ID. Accordingly, the zapping server 18 checks whether the selected program can be transmitted through the DTV broadcasting encoding apparatus 12 and the VoD server 14, and sends a STB (ProgramSelectConfirm message) which is a response message indicating whether the selected program can be transmitted. 34). As shown in FIG. 4, the ProgramSelectConfirm message includes a session ID and a response broadcast program ID.

2-2) Optionally, when zapping server 18 requests channel change

The zapping server 18 carries the information informing the STB 34 that the current program is forcibly switched to the defined program in the ProgramSelectIndication message on the channel transmitted to the STB 34 and transmits the ProgrmaSelectIndication message to the STB 34. The STB 34 sends a ProgramSelectResponse message to the zapping server 18 as a response message.

Hereinafter, an operation for receiving an HDTV-class multimedia service from a client STB 34 using a VDSL technology such as HDTV viewing or HDTV-class VoD service will be described in detail.

First, the operation for watching HDTV is as follows.

Watching TV

1. The DTV broadcasting encoding apparatus 12 converts analog broadcast signals such as CATV (cable television) broadcasting into MPEG encoding and converts them into SDTV (moving picture expert group) MPEG (TS) transport streams, and terrestrial HDTV. The broadcast signal or the cable HDTV broadcast signal is converted to HDTV class MPEG TS and broadcasted to the switch 22 through the zapping server 18.

2. The STB 34 obtains channel information by exchanging channel 잽 protocol messages (Request, Confirm) with the zapping server 18.

3. Then, if the client STB 34 selects through the desired channel zapping protocol, the zapping server 18 applies the switch control signal SWC to the ATM switch 22 so that the user can watch one HDTV broadcasting program. The channel of the switch 22 is changed. That is, the STB 34 is transmitted by the zapping server 18 by adjusting the VPI / VCI value of the ATM switch 22 using the switch control signal SWC and connecting the VCI value to the HDT 24. Enables you to receive HDTV broadcasts of channels.

4. When the channel is changed, the STB 34 sends the changed channel information to the zapping server 18, and the zapping server 18 changes the channel in the same manner as described above.

Next, the operation for the HDTV-class VoD service will be described.

VoD service

1. The STB 34 requests the zapping server 18 for program guide information on the HDTV-class VoD service.

2. The zapping server 18 obtains program guide information about VoD content from the VoD server 14 and transmits the program guide information to the STB 34.

3. When the STB 34 requests a specific HDTV class VoD content program, the VoD server 16 pumps the specific HDTV class VoD program requested by the ATM switch 22.

4. At this time, the zapping server 18 connects the channel of the VoD content program with the VCI value passed to the HDT 24 by using the switch control signal SWC so that one channel of HDTV class VoD program is serviced to the user.

As such, when a section is set between the zapping server 18 and the STB 34, the zapping server 18 requests a multimedia service for one channel such as channel change or channel selection from the client STB 34. It accepts a signal and gives a response.

However, there may occur a case where the network connection is abnormally terminated between the zapping server 18 or the service provider server (eg, an HDTV broadcasting apparatus, a VoD server, a web server, etc.) and the client STB 34. In this case, since the set session between the zapping server 18 or the service providing server and the client STB 34 is not normally terminated, the service providing server continuously provides the service to the client STB 34.

In the present invention, in order to prevent such a waste of resources, the server periodically checks the status of the client STB 34 using ServerStatusRequest. This message is sent to the STB 34 once every predetermined time, for example at 30 minute intervals. The transmission period of such a message can be changed depending on the system. If the client STB 34 does not send a response, the server resends the ServerStatusRequest to the client. If the client does not send a response to the ServerStatusRequest retransmitted by the STB 34, the server sends a ReleaseRequest to the client STB 34 to terminate the established session.

Hereinafter, referring to FIG. 1 and FIG. 5, the details of the session control flow of the zapping server will be described.

Referring to FIG. 1, the zapping server 18 periodically checks a state of a client STB 34 in a state where the zapping server 18 is set up with the STB 34. To this end, the zapping server 18 operates the timer to check the state of the STB 34 when a predetermined time is reached.

Specifically, referring to FIG. 5, the zapping server 18 starts a timer in step 200 and checks whether a predetermined time has passed in step 210. If the predetermined time is checked by the timer, the zapping server 18 proceeds to step 220 and sends a status request message, for example, ServerStatusRequest, to the STB 34, which is a client. The zapping server 18 then checks in step 230 if there is a response from the client, STB 34. If there is a response, the zapping server 18 returns to step 200 to start the timer. If there is no response from the STB 34 client, the zapping server 18 proceeds to step 240 and resends the status request message to the STB 34 client. This retransmission may be made several times depending on the system. If there is a response to the status request message resent from the client STB 34, the zapping server 18 returns to step 200 to start the timer.

If there is no response to the status request message resent from the client STB 34, the zapping server 18 proceeds to step 260 to transmit a session termination message, for example, ReleaseRequest, to the client STB 34. The zapping server 18 then proceeds to step 270 to terminate the session set up with the STB 34 as a client.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention provides the HDTV-class MPEG-2 VoD service and the HDTV-class TV watching system using VDSL technology using existing telephone lines without additional work such as the installation of dedicated lines in buildings such as hotels, schools, companies, and buildings. The same digital broadcast service is possible.

Claims (16)

In a communication system for high definition television (HDTV) level multimedia service, A client terminal device in a subscriber's home that provides a terminal user with network access through a subscriber line; It supplies HDTV-class multimedia service programs that can be provided to the client terminal device, and includes a zapping server, and accepts the HDTV-class multimedia service request signal for a channel requested by the user of the client terminal device by the zapping server. A service provider that responds to a client terminal device and provides a HDTV-class multimedia service program of a channel requested by the user of the client terminal device among the supplied HDTV-class multimedia service programs; An access network connected between the service provider and the client terminal device and providing a communication path between the service provider and the client terminal device so that the client terminal device can receive the HDTV-class multimedia service program through the subscriber line; Communication system for high-definition television-class multimedia service, characterized in that consisting of. 2. The communication system of claim 1, wherein the subscriber line is a Very-high-data-rate Digital Subscriber Line (VDSL). The communication system of claim 1, wherein the zapping server periodically transmits a status request message to the client terminal device to check a communication state with the client terminal device. The client terminal of claim 3, wherein the zapping server retransmits the status request message one or more times if there is no response message from the client terminal device, and if there is no response message for the resent status request message. A communication system for a high-definition television-class multimedia service, characterized in that the communication with the device is terminated. The method of claim 1, wherein the access network, A plurality of optical network units (ONUs) connected to the client terminal by the VDSL and providing an interface between the optical cable and the VDSL; Multiplexing uplink signals connected to the ONUs by the optical cable and transmitted from the integrated terminal devices to the service providing system through the ONUs, and demultiplexing downlink signals transmitted from the service providing system to the client terminal device At least one HDT (Host Digital Terminal) for transmitting through the ONUs, An HDTV-class multimedia service program of a channel requested by the user of the client terminal device among the HDTV-class multimedia service programs which are connected to the service provider and connected to the HDT by an optical cable and supplied according to the switching control of the zapping server. And an Asynchronous Transfer Mode (ATM) switch for transmitting the data to the client terminal through the HDT. In a communication system for high definition television (HDTV) level multimedia service, A client terminal device in a subscriber's home that provides a terminal user with network access through a Very-high-data-rate Digital Subscriber Line (VDSL); A multimedia service supply device for supplying HDTV-class multimedia service programs including HDTV broadcasting programs and HDTV-grade video on demand (VOD) content programs; The client terminal device user accepts the HDTV-level multimedia service request signal for the channel requested by the client terminal device user and responds to the client terminal device. A zapping server providing HDTV-class multimedia service program of the requested channel; An access network connected between the zapping server and the client terminal device and providing a communication path between the zapping server and the client terminal device so that the client terminal device can receive the HDTV-class multimedia service program through the VDSL. Communication system for high-definition television-class multimedia service characterized in that the configuration. The communication system of claim 6, wherein the client terminal device is a set-top box. A service provider that provides high definition television (HDTV) -class multimedia service programs to subscriber home client terminal users and an Internet access service, and is connected to the service provider by an optical cable and has a VDSL (Very High) A method for a high-definition television-class multimedia service in a communication system having an access network connected to a data-rate digital subscriber line, Transmitting program guide information for an HDTV-class multimedia service from the service provider to the client terminal device while exchanging a message defined by a channel 잽 protocol between the service provider and the client terminal device; If there is a program selection request from the client terminal device based on the program guide information, the service provider sends the selected HDTV-class multimedia service program among the provided HDTV-class multimedia service programs through the access network and the VDSL. High-definition television-class multimedia service method comprising the step of transmitting to the terminal device. 10. The method of claim 8, wherein the HDTV-class multimedia service programs include at least HDTV broadcast programs and HDTV-grade video on demand content programs. 10. The method of claim 8, wherein the channel 잽 protocol comprises at least message flow procedures of channel control and channel change. A service supply device for supplying high definition television (HDTV) level multimedia service programs to a subscriber indoor client terminal device user, and accepts an HDTV level multimedia service request signal for a channel requested by the client terminal device user, A zapping server providing an HDTV-level multimedia service program of a channel requested by the user of the client terminal device among the HDTV-class multimedia service programs supplied by the multimedia service supply device, and connected to the zapping server by an optical cable; In addition, the method for a high-definition television-class multimedia service in a communication system having an access network connected to the client terminal device by a VDSL (Very high-data-rate Digital Subscriber Line), Transmitting, by the client terminal device, a client session setup request message to the zapping server to establish a session; In response to the client session setup request message, the zapping server confirms the subscriber registration from the client session setup request message and then sends the client session setup confirmation message including the video program guide information to the client terminal device to the client terminal device. Transfer process, Transmitting, by the client terminal device, a program selection request message for requesting that the zapping server provide a program selected by a channel change request of a user of the client terminal device after setting the session; The zapping server receiving the program selection request message confirms whether the selected program can be transmitted through the service supply device, and transmits a program selection confirmation message to the client terminal device in response to whether the selected program can be transmitted. High-definition television-class multimedia service method characterized in that the process consisting of. 12. The high definition television set of claim 11, wherein the client session setup request message includes a session ID, a reserved client ID, and a server ID indicating the zapping server. Level multimedia service method. 12. The method of claim 11, wherein the client session setup confirmation message includes at least a session ID and a server ID. 12. The method of claim 11, wherein the program selection request message includes at least a session ID and a reserved broadcast program ID. 12. The method of claim 11, wherein the program selection confirmation message includes at least a session ID and a response broadcast program ID. 12. The method of claim 11, wherein the zapping server periodically sends a status request message to the client terminal device to check the state of the session with the client terminal device, and if there is no response message for the status request message from the client terminal device. And retransmitting the response request message and terminating the session with the client terminal device if there is no response message for the retransmitted status request message.