KR20070046632A - Method and system for managing code division multiplex channel for use in digital multimedia broadcasting service - Google Patents

Abstract

The present invention relates to a method and a system for operating a code division multiplex (CDM) channel in a digital multimedia broadcasting (DMB) service.

The present invention includes the steps of: (a) searching for an update notification table (UNT) in the DMB service additional information upon receiving the program content and DMB service additional information; (b) checking whether there is an updated table or updated message using UNT; And (c) updated through the Electronic Program Guide (EPG) CDM channel or data CDM channel only when there is an updated table or an updated message as a result of the confirmation in step (b). A method of operating a CDM channel in a DMB service, comprising receiving a table or an updated message.

According to the present invention, the CDM channel can be efficiently operated by preventing unnecessary waste of the CDM channel in the satellite DMB terminal and utilizing the wasted CDM channel.

Satellite DMB, CDM, Channel, Update, Table, Message, UNT, CAS, EPG

Description

Method and System for Managing Code Division Multiplex Channel for Use in Digital Multimedia Broadcasting Service

1 is a block diagram schematically illustrating a CDM channel operating system in a DMB service according to an embodiment of the present invention;

2 is a block diagram schematically showing the structure of a satellite DMB terminal according to an embodiment of the present invention;

3 is an exemplary diagram illustrating a table for explaining a method of operating a CDM channel in a satellite DMB terminal according to an embodiment of the present invention;

4 is an exemplary diagram of a message format for explaining a UNT according to a preferred embodiment of the present invention;

5 is a flowchart illustrating a CDM channel operating method in a DMB service according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: satellite DMB terminal 120: DMB repeater

130: DMB satellite 140: satellite DMB broadcasting center

150: PP 210: satellite antenna

212: Ku-Band Antenna 214: S-Band Antenna

220: tuner 230: CDM demodulator

240: CAS 250: A / V decoder

260: speaker 270: LCD screen

The present invention relates to a method and a system for operating a code division multiplex (CDM) channel in a digital multimedia broadcasting (DMB) service. More specifically, when the DMB receiver receives the broadcast program content and the DMB service additional information in the DMB service, the CDM channel, which is a physical broadcast channel of the DMB, in the DMB broadcasting center in order to efficiently receive the broadcast program content and the DMB service additional information. An update table indicating whether or not the message is transmitted to the DMB receiver through the CDM channel or the data transmitted to the DMB receiver through the Electronic Access Guide (EPG) CDM channel through the CAS (Conditional Access System) CDM channel. When the DMB receiver uses the CDM demodulator to check the update status table received through the CAS CDM channel among the CDM channels, and if the table or the message is not updated, the EPG CDM channel or data CDM channel receives the program content. Method and system for operating CDM channel in DMB service .

As computer, electronic, and communication technologies have made rapid progress, various wireless communication services using wireless networks have been provided. Accordingly, a service provided by a mobile communication system using a wireless communication network is developing not only a voice service but also a multimedia communication service for transmitting data such as circuit data, packet data, and the like. In recent years, the third generation mobile communication system IMT-2000 (International Mobile Telecommunication 2000) (for example, Code Division Multiple Access (CDMA) 2000 1X, 3X, EV-DO, Wideband CDMA (WCDMA, etc.)) has been commercialized. .

However, the existing mobile communication system has a limitation in providing high-speed wireless Internet due to high base station construction cost and high usage rate of the wireless Internet, and a limited screen size of the mobile communication terminal. Therefore, a high-speed portable Internet service (WiBro: Wireless Broadband Internet) has emerged, which guarantees portability and mobility and can use a high-speed wireless Internet service at a low rate.

The mobile internet service uses various types of portable communication terminals such as laptops, PDAs, and handheld PCs to access the Internet in indoor and outdoor stationary environments and mobile environments at walking speeds and low to medium speeds. It is a possible service. The portable Internet service system uses the 2.3 GHz frequency band and provides mobility of 60 km / h per hour. The downlink transmission rate is 24.8 Mbps, but the uplink transmission rate is 5.2 Mbps. Line data system. In addition, the portable Internet service system uses a time division duplex (TDD) in a duplex scheme or an orthogonal frequency division multiple access (OFDMA) / TDMA (multiple access) scheme in order to effectively use an allocated frequency spectrum. Time Division Multiple Access).

On the other hand, with the development of mobile communication technology, the demand for using a broadcast service including a video service, a voice service, etc. in a mobile communication environment has increased rapidly, and digital multimedia broadcasting (DMB) is referred to as 'DMB'. Service emerged.

The DMB service refers to a broadcasting service that digitally modulates various multimedia data such as video data and audio data and provides the same to a fixed terminal or a portable terminal. In other words, it means a service that can provide high-quality, high-definition broadcasting of CD (Compact Disc) or DVD (Digital Versatile Disc) level to a mobile communication terminal or a vehicle terminal such as a mobile phone, a PDA (Personal Digital Assistant) even while on the move. Unlike conventional analog broadcasting, the DMB service is combined with a mobile communication network to provide an interactive service such as remote purchase, telemedicine, or distance education. For example, you can order an advertising product that is broadcast while moving, and you can download the desired educational program.

DMB service is divided into 'terrestrial DMB' and 'satellite DMB' according to service type and network configuration. The satellite DMB service provides DMB service using satellites, and when the satellite DMB broadcasting center transmits the broadcast program contents converted from the digital program to digital multimedia data to the satellites, the satellites receive them and the DMB receivers and gap fillers nationwide It provides DMB service by sending to Filler.

Such a DMB service can provide a bidirectional service as described above, and such a bidirectional service is required to be able to transmit and receive digital data between a DMB broadcasting center and a DMB receiver, and execute not only broadcast program content but also broadcast program content in a DMB receiver. The DMB service additional information such as information for downloading the application program module, the broadcasting program content module and the application module, binding message of the DMB service, application information, and information about the broadcasting program should be transmitted and received.

Meanwhile, in the DMB service, one broadcast program content and DMB service additional information thereof are distributed and transmitted to a plurality of CDM channels. Accordingly, the DMB receiver includes a plurality of CDM demodulators for receiving broadcast program content and DMB service side information through a plurality of CDM channels. However, DMB receivers can typically decode only five CDM channels simultaneously due to hardware limitations. As a result, there is a limitation that the CDM channel is insufficient when the DMB receiver receives broadcast program content and DMB service additional information.

Therefore, as described above, when there is a lack of available CDM channels due to hardware constraints, the DMB receiver needs to operate the CDM channel efficiently in order to process a large amount of information more quickly. Accordingly, there is an increasing demand for the development of a scheme for efficiently operating the CDM channel.

In order to meet these demands, the present invention provides a physical information of a DMB in a DMB broadcasting center to efficiently receive broadcast program content and DMB service additional information when a DMB receiver receives broadcast program content and DMB service additional information in a DMB service. Among the CDM channels, which are broadcasting channels, various tables or data transmitted to the DMB receiver through the Electronic Program Guide (EPG) CDM channel through the CAS (Conditional Access System) CDM channel are informed whether messages are transmitted to the DMB receiver through the CDM channel. The state transmits an update table, checks whether the DMB receiver uses the CDM demodulator on the CAS CDM channel among the CDM channels, and broadcasts an EPG CDM channel or data CDM channel when the table or message is not updated. How to operate CDM channel in DMB service used to receive program content To provide a system which is its purpose.

In order to achieve the above object, the present invention provides a satellite DMB that generates and transmits broadcast program content and digital multimedia broadcasting (DMB) service additional information obtained by converting a broadcast program into digital multimedia data. Code Division Multiplexing (CDM) in a satellite DMB terminal receiving broadcast program content and DMB service additional information and outputting the broadcast program through a DMB satellite and a DMB repeater relaying broadcast program content and DMB service additional information from a broadcasting center A method of operating a multiplex channel, hereinafter referred to as 'CDM', comprising: (a) an updated notification table (UNT) in the DMB service additional information when receiving broadcast program content and DMB service additional information; Searched for; (b) checking whether there is an updated table or updated message using UNT; And (c) updated through the Electronic Program Guide (EPG) CDM channel or data CDM channel only when there is an updated table or an updated message as a result of the confirmation in step (b). A method of operating a CDM channel in a DMB service, comprising receiving a table or an updated message.

According to another object of the present invention, there is provided a DMB satellite and a DMB repeater for relaying broadcast program content and digital multimedia broadcasting (DMB) service additional information. In a system that operates a CDM: Code Division Multiplex (hereinafter referred to as CDM) channel, a broadcast program content and update notification table (UNT), which is a broadcast program converted into digital multimedia data, is referred to as a UNT. Satellite DMB broadcasting center for generating and transmitting the DMB service additional information, including; And upon receiving the program content and the DMB service supplementary information, search for an UNT and check whether there is an updated table or updated message using the UNT, and then only if there is an updated table or updated message. Electronic Program Guide, hereinafter referred to as EPG), a satellite DMB terminal for receiving an updated table or updated message through a CDM channel or a data CDM channel, and outputting a broadcast program content. Provide CDM channel operating system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, a preferred embodiment of the present invention will be described on the assumption that a system for providing a digital multimedia broadcasting (DMB) service is a satellite DMB system for providing a satellite DMB service. However, the present invention is not limited to this assumption, but may be used for digital broadcasting such as terrestrial DMB broadcasting digital multimedia data.

In addition, hereinafter, a satellite DMB terminal that receives broadcast program content obtained by converting a broadcast program into digital multimedia data may simultaneously decode five code division multiplex (CDM) channels. Assume that you can. However, the present invention is not limited to this assumption, but may be used in a satellite DMB terminal capable of simultaneously decoding five or more CDM channels.

1 is a block diagram schematically illustrating a CDM channel operating system in a DMB service according to an embodiment of the present invention.

CDM channel operating system in the DMB service according to a preferred embodiment of the present invention is a satellite DMB terminal 110, DMB repeater 120, DMB satellite 130, satellite DMB broadcasting center 140 and program provider (PP: Program Provider, hereinafter referred to as 'PP', 150).

The satellite DMB terminal 110 performs a mobile communication service including a voice call service and a wireless data service, and broadcast program content and DMB service, which are broadcast programs in the form of digital multimedia data from the DMB repeater 120 and the DMB satellite 130. The mobile communication terminal 110 receives the additional information and outputs it to a screen provided with the broadcast program and the additional information.

Here, the DMB service additional information refers to a control message for controlling an application executing the broadcast program content, download information for downloading the module of the broadcast program content and the module of the application, information about the application, and a related DMB service. As a service binding message, information on a broadcast program, and the like, the satellite DMB terminal 110 uses the DMB service additional information to provide a viewer using the DMB service with the broadcast channel for the broadcast program, the broadcast time of the broadcast program, and the genre of the broadcast program. Provides detailed information about the programmer, performer, etc., downloads the program content, that is, URL (Uniform Resource Locator) information, information about the broadcast program associated with the broadcast program, downloads an application that executes the broadcast program content, Update Data, a controlling message, and the like, to the satellite DMB terminal 110.

In addition, the satellite DMB terminal 110 according to the preferred embodiment of the present invention receives the broadcast program content and DMB service additional information from the satellite DMB broadcasting center 140 through the DMB repeater 120 and the DMB satellite 130. , Update Notification Table (UNT) received through a CDM channel using a Conditional Access System (CAS) among five CDM channels using a CDM demodulator (UNM). Check the 'UNT') and update by checking the update of various messages transmitted through the CDM channel or various tables transmitted through the CDM channel or Electronic Program Guide (EPG). Only when there is a table or message that has been updated is the CDM demodulator tuned to the EPG CDM channel or data channel to receive the updated table or message. In other words, when there is no updated table or message, the satellite DMB terminal 110 may use the CDM demodulator in other tasks without having to wait by fixing the CDM demodulator to the EPG CDM channel or the data CDM channel.

Here, the structure of the satellite DMB terminal 110 according to the preferred embodiment of the present invention and the method of operating the CDM channel by the satellite DMB terminal 110 according to the preferred embodiment of the present invention will be described with reference to FIGS. 2 and 3. It explains in detail.

DMB repeater 120 is also referred to as a gap filler (Gap Filler), it is installed in underground spaces, buildings, dense areas, etc., difficult to receive radio waves to receive satellite DMB signals from the DMB satellite 130 to receive satellite DMB terminal 110 It is a shaded area repeater. The DMB repeater 120 receives the satellite DMB signal from the DMB satellite 130 in a time division multiplexing (TDM) method in the Ku-Band band and converts the satellite DMB signal in the S-Band band into a CDM (Code Division Multiplexing) method. Then, the converted satellite DMB signal is transmitted to the satellite DMB terminal 110 by the CDM method.

The DMB satellite 130 includes four Ku-Band repeaters using a 25 MHz frequency band and 36 S-Band repeaters at 25 MHz using a frequency band required for transmitting satellite DMB signals to a mobile communication system. .

The DMB satellite 130 uses the S-Band CDM signal using a frequency of about 2.6 GHz and the Ku-band using a frequency of 11 to 12 GHz for broadcast digital data, which is digital multimedia data obtained by broadcasting a broadcast program from the satellite DMB broadcasting center 140. The satellite DMB terminal 110 simultaneously receives a band TDM signal and receives a satellite DMB signal, which is a S-Band CDM signal using a frequency of about 2.6 GHz, and a satellite DMB signal, which is a Ku-Band TDM signal using a frequency of 11 to 12 GHz, respectively. And simultaneously sent to the DMB repeater 120.

The satellite DMB broadcasting center 140 receives a broadcast program from the PP 150, generates a broadcast program content through a signal conversion process conforming to the satellite DMB standard, and transmits the broadcast program content to the DMB satellite 130. The satellite DMB broadcasting center 140 compresses the signals received from the baseband system and the baseband system for channel-specific switching for allocating the received broadcast program content to each channel to H.264 and AAC + standards, CAS that provides services such as multiplexing in accordance with MPEG-2 system standard and compression multiplexing system performing CDM modulation, viewing authority grant, commodity package composition, pay per view (PPV), pay per channel (PPC), etc. PSI / SI (Program Specific Information / Service Information) system that transmits tables for demultiplexing multiplexed data packets to MPEG-2 system standard and PMS / APC which manages and inputs information to perform various broadcasting services. It consists of subsystems, such as a (Program Management System / Automatic Playout Control) system.

Satellite DMB broadcasting center 140 according to a preferred embodiment of the present invention in transmitting the broadcast program content and DMB service additional information to the satellite DMB terminal 110 through the DMB satellite 130 and the DMB repeater 120, CDM The UNT is transmitted as well as information normally transmitted through the CAS CDM channel among the channels, so that the satellite DMB terminal 110 can check whether various tables or various messages are updated.

The PP 150 refers to a server of a broadcast program provider that generates a broadcast program and transmits the broadcast program to the satellite DMB broadcasting center 140. The content of the broadcast program may be a TV program such as a terrestrial TV broadcaster, a cable cable TV broadcaster, or an internet broadcaster, such as dramas, entertainment programs, movies, music programs, news, journals, etc., and DVDs and videos.

2 is a block diagram schematically showing the structure of a satellite DMB terminal 110 according to an embodiment of the present invention.

Satellite DMB terminal 110 according to a preferred embodiment of the present invention is a satellite antenna 210, tuner (Tuner, 220), CDM demodulator 230, CAS (240), A / V decoder 250, speaker 260 ) And an LCD screen 270.

The satellite antenna 210 includes a Ku-Band antenna 212 and an S-Band antenna 214, and detects the Ku-Band satellite DMB signal from the DMB repeater 120 using the Ku-Band antenna 212. The S-Band antenna 214 detects and transmits the S-Band satellite DMB signal from the DMB satellite 130.

The tuner 220 converts an RF signal received from the satellite antenna 212 into an intermediate frequency (IF) signal and transmits the converted signal. That is, the tuner 220 converts the high frequency RF signal into an IF signal that can be processed by the satellite DMB terminal 110 and transmits the signal.

The CDM demodulator 230 includes a first CDM demodulator, a second CDM demodulator, a third CDM demodulator, a fourth CDM demodulator, and a fifth CDM demodulator, each demodulator being a CDM channel operated by the satellite DMB terminal 110. It performs a function of detecting, despreading, error correcting, and demodulating a CDM signal received through a pilot CDM channel, a CAS CDM channel, an EPG CDM channel, and two data CDM channels. Here, the CDM channel operated by the satellite DMB terminal 110 will be described in detail with reference to FIG. 3.

The CDM demodulator 230 according to the preferred embodiment of the present invention demodulates and converts the signal received through the five CDM channels of the IF signal transmitted from the tuner 220 to convert the program content into an MPEG-2 transport stream. After generating and transmitting the broadcast program content in the form, extracting and processing the DMB service additional information, and controlling the application for executing the broadcast program content, downloading the module of the broadcast program content, the module of the application, and the broadcast program Generate and send data for outputting detailed information about.

At this time, the CDM demodulator 230 according to the preferred embodiment of the present invention checks whether UNT received through the CAS CDM channel of the five CDM channels to check whether or not to update the various tables and various messages, and updated table or message Receives updated tables or messages through the EPG CDM channel and data CDM channel only if there are, and, if there are no updated tables or messages, takes over the EPG CDM channel and data CDM channel until there are updated tables or messages. The lower CDM demodulator is used to receive broadcast program content and DMB service additional information.

The CAS 240 determines whether to output broadcast program content in the form of MPEG-2 transport stream delivered from the CDM demodulator 230. That is, the viewer's viewing authority is determined to deliver broadcast program content in the form of MPEG-2 transport stream only when there is viewing authority for the corresponding broadcast program.

The A / V decoder 250 decodes the broadcast program content in the form of MPEG-2 transport stream, converts the broadcast program content into data that can be viewed, and delivers the same to the speaker 260 and the LCD screen 270. The speaker 260 and the liquid crystal display 270 are devices for outputting audio and video.

3 is an exemplary diagram for explaining a method of operating a CDM channel in the satellite DMB terminal 110 according to an embodiment of the present invention.

As described with reference to FIG. 2, the CDM demodulator 230 of the satellite DMB terminal 110 includes five demodulators including a first CDM demodulator, a second CDM demodulator, a third CDM demodulator, a fourth CDM demodulator, and a fifth CDM demodulator. Each demodulator is responsible for a pilot CDM channel, a CAS CDM channel, an EPG CDM channel, and two data CDM channels, as shown in FIG.

The pilot CDM channel is a CDM channel for transmitting synchronization signals, data for configuring the CDM channel, control data, and the like. The pilot CDM channel should be monitored at all times by the CDM demodulator 230.

The CAS CDM channel is a CDM channel for transmitting a conditional access table (CAT), a program association table (PAT), a network information table (NIT), an entitlement management message (EMM), an updated notification table (UNT), and the like. The CAS CDM channel should also be monitored at all times by the CDM demodulator 230.

Conventional satellite DMB terminals do not transmit UNT over the CAS CDM channel. However, according to the present invention, whether there is an updated table or message so that the CDM demodulator 230 does not need to constantly monitor and monitor another channel, that is, an EPG CDM channel or a data CDM channel, in order to receive the updated table or message. By transmitting the UNT including the CAS through the CDM channel, the CDM demodulator 230 checks the UNT so that the CDM demodulator 230 receives the EPG CDM channel or the data CDM channel only when there is an updated table or message. .

That is, as will be described later, the updated table or message does not always need to be monitored when receiving a broadcast program, and only when the updated table or message is received, the conventional satellite DMB terminal 110 may be used. Since the CDM demodulator 230 does not know whether there is an updated table or message, the EPM CDM channel and the data CDM channel should be monitored at all times. The present invention transmits the UNT to the satellite DMB terminal 110 through the CAS CDM channel that must be monitored at all times in order to solve this problem by telling the satellite DMB terminal 110 that there is an updated table or message. Prevent 110 from wasting unnecessary CDM channels.

The EPG CDM channel is a CDM channel for transmitting a service description table (SDT), an event information table (EIT), a time date table (TOT), a binding information table (BIT), an audio program map table (PMT), and the like. EPG CDM channels are monitored whenever there is a table being updated. Accordingly, the CDM demodulator 230 checks the UNT of the CAS CDM channel and receives the updated table through the EPG CDM channel only when there is an updated table.

The two data CDM channels perform the same function, which is a CDM channel for transmitting PMTs, audio / video streams, and application modules. The two data CDM channels should be monitored at all times when receiving audio / video streams, i.e. program content, but need not always be monitored when receiving eg modules of the application and receive updated messages, i.e. application modules. Is monitored only when Accordingly, the CDM demodulator 230 confirms the UNT of the CAS CDM channel and receives the updated message through the two data CDM channels only when there is an updated message.

4 is an exemplary diagram of a message format for describing a UNT according to a preferred embodiment of the present invention.

UNT according to a preferred embodiment of the present invention is a table including information indicating whether or not to update the various types of tables, such as SDT, EIT, TOT, BIT, audio PMT transmitted on the EPG CDM channel or the message transmitted on the data CDM channel . UNT is defined as shown in FIG. 4 in the form of an MPEG-2 section.

The UNT includes ID and Version information of the table indicating whether to update, and the CDM demodulator 230 checks this information and checks the information through the EPG CDM channel or data CDM channel through which the updated table or message is transmitted. Receive updated tables or messages.

5 is a flowchart illustrating a CDM channel operating method in a DMB service according to an embodiment of the present invention.

When the satellite DMB broadcasting center 140 receives a broadcast program from the PP 150, the broadcast program content generated by converting the broadcast program into digital multimedia data is generated and the satellite DMB terminal is operated through the DMB satellite 130 and the DMB repeater 120. To 110. In this case, the satellite DMB broadcasting center 140 transmits the DMB service additional information together with the broadcast program content. If the UND is added to the CAS CDM channel among the CDM channels, the satellite DMB terminal 110 adds the broadcast program content and the DMB service. Receive the information (S510).

The satellite DMB terminal 110 receiving the broadcast program content and the DMB service additional information checks the UNT received through the CAS CDM channel among the CDM channels using the CDM demodulator 230 (S520), and the updated table or message is displayed. Check whether there is (S530).

The satellite DMB terminal 110 checks the ID of the updated table or message if there is an updated table or message as a result of checking in step S530, and the CDM channel (ie, EPG CDM channel or Receive the updated table or message via the data CDM channel).

The satellite DMB terminal 110 checks the EPG CDM channel or the data CDM channel until there is an updated table or message in the UNT received through the CAS CDM channel if the updated table or message does not exist. Through the broadcast program content or the DMB service additional information is received (S540).

As a result, since the satellite DMB terminal 110 operates only the CDM channel limited by hardware constraints, it is possible to efficiently operate the CDM channel by utilizing the CDM channel that was wasted because it was unable to process a large amount of data at the same time.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, it is possible to inform that there is an updated table or message through the CAS CDM channel that should be monitored at all times, thereby preventing unnecessary waste of the CDM channel in the satellite DMB terminal, and limited by hardware constraints. Since only the CDM channel is operated, it is possible to efficiently operate the CDM channel by utilizing the wasted CDM channel by solving the problem that a large amount of data could not be processed simultaneously.

Claims (10)

The program content and the DMB from a satellite DMB broadcasting center that generates and transmits broadcast program content and digital multimedia broadcasting (DMB) service additional information by converting a broadcast program into digital multimedia data. Code Division Multiplex (CDM) in a satellite DMB terminal receiving the broadcast program content and the DMB service additional information and outputting the broadcast program through a DMB satellite and a DMB repeater for relaying service additional information. Method of operating a channel, (a) retrieving an update notification table (UNT) from the DMB service additional information when receiving the program content and the DMB service additional information; (b) checking whether there is an updated table or updated message using the UNT; And (c) through the electronic program guide (EPG) CDM channel or data CDM channel only when there is the updated table or the updated message as a result of the checking in step (b); Receiving the updated table or the updated message CDM channel operating method in the DMB service characterized in that it comprises a. The method of claim 1, wherein in step (a), The UNT is a CDM channel operating method in the DMB service, characterized in that received through the CDM channel (CAS: Conditional Access System (CAS)) of the CDM channel. The method of claim 2, wherein in step (a), And the satellite DMB terminal constantly searches the CAS CDM channel to search for the UNT. The method of claim 1, wherein in step (b), the UNT, Whether there is the updated table or the updated message, an identification of the updated table or the updated message, and version information of the updated table or the updated message, and the satellite DMB The terminal identifies the updated table or the updated message by using the ID and the version information. Broadcast Program Content and Digital Multimedia Broadcasting (DMB) Service Includes DMB satellites and DMB repeaters for relaying additional information and includes Code Division Multiplex (CDM) In a system for operating a channel, A satellite DMB broadcasting center for generating and transmitting DMB service additional information including the broadcast program content converted from the broadcast program into digital multimedia data and an update notification table (UNT); And Upon receiving the broadcast program content and the DMB service additional information, search for the UNT and check whether there is an updated table or updated message using the UNT, and then only if the updated table or updated message exists. Electronic program guide (EPG) (hereinafter referred to as EPG) A satellite DMB terminal that receives the updated table or the updated message through a CDM channel or a data CDM channel and outputs the broadcast program content. CDM channel operating system in the DMB service, characterized in that it comprises a. The method of claim 5, The satellite DMB broadcasting center transmits the UNT through a Conditional Access System (CAS) CDM channel among the CDM channels, and the satellite DMB terminal transmits the CAS CDM channel among the CDM channels. CDM channel operating system in the DMB service, characterized in that to always monitor the receiving the UNT. The method of claim 6, wherein the satellite DMB terminal, A satellite antenna including a Ku-band antenna for detecting and transmitting a satellite DMB signal of Ku-Band from the DMB repeater, and an S-band antenna for detecting and transmitting satellite DMB signal of S-Band from the DMB satellite; A tuner for converting a radio frequency (RF) signal received from the satellite antenna into an intermediate frequency (IF) signal for transmission; And a plurality of lower CDM demodulators which convert and demodulate the IF signal received from the tuner into a plurality of CDM signals through a plurality of CDM channels to generate and transmit broadcast program content in the form of MPEG-2 transport stream. And searching for the UNT received through the CAS CDM channel among the plurality of CDM channels using the plurality of lower CDM demodulators, and checking whether there is the updated table or the updated message using the UNT. A CDM demodulator for receiving the updated table or the updated message through the EPG CDM channel or the data CDM channel of the plurality of CDM channels only when there is the updated table or the updated message; Upon receiving the broadcast program content in the MPEG-2 transport stream form from the CDM demodulator, the viewing authority is determined, and the MPEG-2 transport stream form is provided only when the viewing right is provided for the broadcast program content in the MPEG-2 transport stream form. CAS for transmitting broadcast program content of; An audio / video decoder (A / V decoder: audio / video decoder) for transmitting broadcast program content obtained by decoding the broadcast program content in MPEG-2 format when receiving the broadcast program content in MPEG-2 transport stream form from the CAS; Video Decoder, hereinafter referred to as 'A / V Decoder'; And Speaker and liquid crystal display for outputting audio and video of the broadcast program content upon receiving the decoded broadcast program content from the A / V decoder CDM channel operating system in the DMB service, characterized in that it comprises a. The method of claim 5, wherein the CDM channel, A pilot CDM channel, which is a CDM channel for transmitting one or more of a synchronization signal, data for configuring the CDM channel, and control data for controlling an application executing the broadcast program content; The CAS CDM channel, which is a CDM channel for transmitting one or more of a conditional access table (CAT), a program association table (PAT), a network information table (NIT), an entitlement management message (EMM), and the updated notification table (UNT); The EPG CDM channel, which is a CDM channel for transmitting at least one of a service description table (SDT), an event information table (EIT), a time date table (TOT), a binding information table (BIT), and an audio program map table (PMT); And The plurality of data CDM channels, which are CDM channels for transmitting one or more of PMT, audio / video streams, and modules of the application; CDM channel operating system in the DMB service, characterized in that it comprises a. The method of claim 8, wherein the satellite DMB terminal, The pilot CDM channel and the CAS CDM channel are constantly monitored, and the EPG CDM channel and the plurality of data CDM channels are monitored only when there is the updated table or the updated message, but the plurality of data CDM channels are CDM channel operating system in the DMB service, characterized in that the monitoring at all times when receiving the program content. The method of claim 9, wherein the satellite DMB terminal, When the CAS CDM channel is constantly monitored to receive the UNT through the CAS CDM channel, the UNT is used to determine whether there is the updated table or the updated message, and the updated table or the updated message is If there is no CDM channel operating system in the DMB service, characterized in that for receiving the broadcast program content using the EPG CDM channel.

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