KR101226324B1 - Method for simultaneously providing a plurality of broadcasting programs through a single channel in a mobile communication system providing Digital Broadcasting service - Google Patents

Abstract

The present invention relates to a digital broadcast service provided in a mobile communication system, and more particularly, to a method of simultaneously providing a plurality of broadcast programs through one channel. In a mobile communication system including a service provider for providing a broadcast program at a first data rate and a mobile terminal using the broadcast program, the service provider provides at least two channels through one broadcast channel according to an embodiment of the present invention. A method of simultaneously providing broadcast programs comprises: encoding streams of the broadcast programs and information regarding the number of broadcast programs, respectively, at a second data rate at least twice lower than the first data rate; And multiplexing the streams of the encoded broadcast programs to transmit the streams of the multiplexed broadcast programs and information about the number of encoded broadcast programs at the first data rate through the one broadcast channel. do.

Broadcast program, digital broadcast, encoding, video stream

Description

{Method for simultaneously providing a multiple of broadcasting programs through a single channel in a mobile communication system providing digital broadcasting service}

1 is a block diagram of a transmitter / receiver for transmitting / receiving a broadcast program according to an embodiment of the present invention.

2 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

3 is an exemplary view of a display unit displaying a plurality of broadcast programs according to an embodiment of the present invention.

4 is a diagram illustrating program information included in channels according to an embodiment of the present invention.

5 is a diagram illustrating broadcast program information according to an embodiment of the present invention.

6 is an exemplary diagram of a program allocation table and a program mapping table according to an embodiment of the present invention.

7 is an exemplary view of streams including channel information and broadcast program information according to an embodiment of the present invention.

8 illustrates a decoding process of TSs received at a receiver according to an embodiment of the present invention.

The present invention relates to a digital broadcast service provided in a mobile communication system, and more particularly, to a method and apparatus for simultaneously providing a plurality of broadcast programs through one channel.

In general, a portable terminal for receiving digital broadcasting refers to a portable terminal having a device for receiving and displaying a broadcast signal transmitted from a digital broadcasting station. Currently, the standards for digital broadcasting are actively in progress worldwide. For example, there is a digital multimedia broadcasting (DMB) method in the United States and a digital video broadcasting (DVB) method in Europe.

The DMB service started with Digital Audio Broadcasting (hereinafter referred to as "DAB") in an attempt to convert an analog radio into a digital radio. By developing the DAB, however, the area can be extended to the area of video without limiting to audio, and the digital video service can be received while moving. Therefore, the DAB, which included only an audio service, has been changed to the DMB including a video service as well as audio. In this case, the DMB service refers to a broadcasting service that provides a variety of multimedia contents such as compact disk-class high quality audio and video to a portable terminal in a digital manner.

The DMB service may be classified into two DMB services, that is, first and second DMB services, according to a transmission means. In the following description, a first DMB service is a satellite DMB service, and a second DMB service is a terrestrial DMB service. The satellite DMB service is a service that transmits various multimedia information such as video including high quality audio and video to a mobile terminal using a broadcast or communication satellite. The satellite DMB service is based on the 'SYSTEM E' method of the satellite DAB standard. For this service, code division multiplexing (CDM) modulation method is used, and a 64-bit Walsh code ( Walsh Code) is used. In the satellite DMB service, about 30 CDM channels, which are physical channels, may be used and may be transmitted at a data rate of 256 Kbps for each CDM channel.

The terrestrial DMB service digitizes a terrestrial TV (Television) broadcasting service to provide various multimedia information such as high quality audio and video to a mobile terminal. Korea's terrestrial DMB system is based on the European Eureka-147 DAB system. The basic transmission method is Orthogonal Frequency Division Multiplexing, which uses differential quadrature phase shift keying. use. The terrestrial DMB service is provided through, for example, airborne channels VHF 8 and 12, and can be transmitted at a data rate of about 750 Kbps in one channel.

Meanwhile, broadcasts used in mobile communication are transmitted at data rates of about 300 Kbps or 400 Kbps for video channels. As described above, in the case of satellite DMB, since one CDM channel supports a data rate of 256 Kbps, two CDM channels are used in a broadcast that supports the data rate of the video channel. In contrast, in the case of terrestrial DMB, since one channel supports about 750 Kbps, one broadcast can be used as one channel, but two or more channels cannot be used simultaneously.

That is, in order to simultaneously output two or more broadcasts on one screen, four or more CDM channels should be used for satellite DMB and two channels for terrestrial DMB. Therefore, it is difficult to satisfy the above-described prior art in a case where one wants to watch several broadcast programs at once in digital broadcasting provided by a mobile communication system.

On the other hand, the digital broadcast service provided in the mobile communication system provides a plurality of broadcast programs through a plurality of broadcast channels. For example, in the case of satellite DMB in Korea at present, 29 broadcast channels are used, and the number of broadcast channels for the broadcast service may increase further in the future. In addition, the number of broadcast programs provided through the broadcast channel will increase accordingly. Therefore, it will take quite a long time to search the channel to identify all the broadcast programs provided.

Accordingly, the present invention provides a method of simultaneously providing a plurality of broadcast programs.

In a mobile communication system including a service provider for providing a broadcast program at a first data rate and a mobile terminal using the broadcast program, the service provider provides at least two channels through one broadcast channel according to an embodiment of the present invention. A method of simultaneously providing broadcast programs comprises: encoding streams of the broadcast programs and information regarding the number of broadcast programs, respectively, at a second data rate at least twice lower than the first data rate; And multiplexing the streams of the encoded broadcast programs to transmit the streams of the multiplexed broadcast programs and information about the number of encoded broadcast programs at the first data rate through the one broadcast channel. do.

In a mobile communication system including a service provider for providing a broadcast program at a first data rate and a mobile terminal using the broadcast program, the service provider provides at least two channels through one broadcast channel according to an embodiment of the present invention. An apparatus for simultaneously providing broadcast programs includes: an encoding unit for encoding streams of the broadcast programs and information regarding the number of broadcast programs, respectively, at a second data rate at least twice lower than the first data rate; And a transmitter configured to multiplex the streams of the encoded broadcast programs, and transmit the streams of the multiplexed broadcast programs and information about the number of encoded broadcast programs at the first data rate through the one broadcast channel. do.

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The foregoing is a somewhat broad summary of features and technical advantages of the present invention in order that those skilled in the art will be better able to understand it from the following detailed description of the present invention. Additional features and advantages of the present invention, which form the subject matter of the claims of the invention, in addition to those features and advantages, will be better understood from the following detailed description of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be described with reference to the accompanying drawings. Those skilled in the art will recognize that the disclosed concept and specific embodiments of the invention described below may be changed or modified to achieve the technical problem to be achieved by the present invention. Those skilled in the art will also recognize that concepts and structures equivalent to the concepts and structures disclosed herein do not depart from the spirit and scope of the broadest form of the invention. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a diagram showing the configuration of a transmitter / receiver for transmitting / receiving a broadcast program according to an embodiment of the present invention.

Referring to FIG. 1, the transmitter 100 is a satellite or terrestrial broadcast service provider for transmitting satellite DMB broadcast and terrestrial DMB broadcast, and detailed descriptions and illustrations of respective components of the satellite or terrestrial broadcast service provider are omitted. And outline only the components required by the present invention. In addition, in the case of satellite DMB broadcasting, the broadcast service provider may be a satellite DMB broadcasting center that transmits satellite DMB broadcasting, and a broadcast signal transmitted from the satellite DMB broadcasting center may be received by a terminal through a satellite. If necessary, the broadcast signal may be transmitted through a place other than the satellite before the terminal is finally received. In the case of terrestrial DMB broadcasting, the broadcast service provider may be a terrestrial DMB broadcasting center that transmits terrestrial DMB broadcasting, and a broadcast signal transmitted from the terrestrial DMB broadcasting center may be received by a terminal through a base station for terrestrial DMB broadcasting. . Like the phase DMB broadcast signal, the terrestrial DMB broadcast signal may also be received through other than the base station mentioned above before finally being received by the terminal. However, in the present invention, the process between the broadcast service provider and the terminal will be omitted for convenience and only the broadcast service provider and the terminal will be mentioned.

The broadcast signal encoding unit 105 encodes and encodes a signal including a broadcast to be transmitted. In the present invention, when the broadcast signal encoding unit 105 encodes a broadcast stream, the broadcast signal encoding unit 105 encodes at a low data rate so that a plurality of broadcast programs can be viewed on one screen. The lower the data rate, the lower the quality of the broadcast program, but the greater the amount of data that can be transmitted. However, since the present invention displays several broadcast programs on one screen and does not require a high quality screen, the present invention encodes at a low data rate so that a large amount of data can be transmitted. For example, if one video channel is encoded at a data rate of 128 kbps, satellite DMB can send two broadcast programs to one physical channel of 256 kbps data rate. In addition, when encoding at the 128 kbps data rate, terrestrial DMB can transmit about five broadcast programs on one physical channel, which is a data rate of 700 kbps. By doing so, the present invention enables to display several broadcast programs simultaneously on one screen.
The system information encoding unit 115 generates system information, that is, channel information, which is information for providing at least one or more broadcast programs, and information on a broadcast program, and encodes the information at a low data rate (for example, 128 kpbs). The channel information includes information on all broadcast channels being serviced and includes information for identifying a broadcast program. The channel information is typically stored in the mobile terminal by being down from the service provider when the mobile terminal is powered on. The information about the broadcast program is information of a broadcast program included in each channel for each broadcast channel. Channel information representing the system information and information on the broadcast program will be described in detail later with reference to the drawings. The transmitter 130 transmits the encoded broadcast signal to the mobile terminal requesting the encoded broadcast signal.

The receiver 150 is a device for receiving and processing a signal transmitted from the transmitter 100 and may be a portable terminal, for example, a notebook, a personal digital assistant, a mobile communication terminal, or the like. As with the transmitter 100, the receiver 150 will also briefly describe only the components necessary for the present invention. In the present invention, a mobile communication terminal will be described by way of example to facilitate understanding of the receiver, and detailed components of the mobile communication terminal will be described later with reference to FIG. The receiver 150 may correspond to the controller 250 of the mobile communication terminal of FIG. 2 to be described later.
The broadcast signal decoding unit 155 decodes and decodes a signal including the received broadcast program. The broadcast signal decoding unit 155 for decoding and decoding a broadcast program signal may correspond to the modem 220 of FIG. 2 for decoding and decoding a received signal. Accordingly, the broadcast signal decoding unit 155 may be configured to be included in the modem 220 of FIG. 2, and may be configured to be included in the receiver 150 corresponding to the controller 250 of FIG. 2 as shown in FIG. 1. It may be.
The system information decoding unit 165 decodes the received system information, that is, channel information, which is information for providing at least one or more broadcast programs, and information on the broadcast program, at a data rate encoded by the transmitter 100. As described above, the channel information includes information on all broadcast channels being serviced and includes information for identifying a broadcast program. In addition, the channel information is typically stored in the portable terminal is down from the service provider when the portable terminal is powered on. The information about the broadcast program is information of a broadcast program included in each channel for each broadcast channel. Channel information representing the system information and information on the broadcast program will be described in detail later with reference to the drawings. The channel information, which is the system information, and the information about the broadcast program, are stored in the system information table 175, and the information is provided from the system information table 175 under the control of the broadcast output control unit 185.
The broadcast output control unit 185 controls to display at least one broadcast program on one screen according to the information of the channel selected by the user from the information about the broadcast program.

The receiver 140 receives a signal including a broadcast program provided from the transmitter 100, and transmits the received broadcast signal to the broadcast signal decoder 155 and the system information decoder 165.
The display unit 190 displays channel information, a broadcast program, and the like under the control of the broadcast output controller 185.

2 is a diagram illustrating a configuration of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 2, an RF unit (hereinafter referred to as “RF”) 210 performs wireless communication of a mobile communication terminal. The RF unit 210 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal.

The modem (MOdulator-DEModulator) 220 includes a transmitter for encoding and modulating the transmitted signal and a receiver for demodulating and decoding the received signal. In the present invention, the broadcast signal decoding unit 155 of FIG. 1 demodulates and decodes a broadcast signal among the received signals. Accordingly, the broadcast signal decoding unit 155 of FIG. 1 may be configured to be included in the modem 220 of FIG. 2, and may be configured to be included in the controller 250.

The audio processor 230 may be configured as a coder (DEC coder). The codec includes a data codec for processing packet data and an audio codec for processing an audio signal such as voice. The audio processor 230 converts the digital audio signal received from the modem 220 into an analog signal through the audio codec to play through a speaker SPK or to output an analog audio signal input from a microphone MIC. It converts the digital audio signal through an audio codec and transmits it to the modem 220. The codec may be provided separately from the audio processor 230 or included in the controller 250.

The key input unit 240 includes keys for inputting numeric and character information and function keys for setting various functions, and outputs a key input signal corresponding to a key input by the user to the controller 250. The key input unit 240 may include a camera mode execution key, a video recording key, and an end key.

The memory 260 includes a program memory that stores program data necessary for controlling the operation of the terminal, and a data memory that stores data generated during control or during execution by the user. The memory 260 may store the system information table 175 of FIG. 1.

The controller 250 performs a function of controlling the overall operation of the terminal. The controller 250 may include the modem 220 and the codec. The receiver 150 of FIG. 1 may correspond to the controller 250.

The camera 270 includes a camera sensor that converts the captured image into an analog image signal. The camera sensor may be implemented as a charge-coupled device (CCD) sensor.

The signal processor 280 converts an analog video signal output from the camera unit 270 into a digital video signal. The signal processor 280 may be implemented with a digital signal processor (DSP). The analog video signal transmitted from the camera sensor (ie, a serial analog RED, GREEN, BLUE: hereinafter referred to as “RGB” signal) is digitally transmitted through an analog front end (AFE) chip of the signal processor 280. The converted and digitally converted 12-bit RGB signal is output as 8-bit YUV data. In general, the YUV data is classified into a Y component, which is a color of an image, and an index U and V component.

The image processor 290 performs a function of generating screen data for displaying an image signal output from the signal processor 280. The image processor 290 processes the image signal output from the signal processor 280 in units of frames, and outputs the image data according to the characteristics and size of the display unit 190. In addition, the image processing unit 290 includes an image codec and performs a function of compressing image data displayed on the display unit 190 in a set manner or restoring the compressed image data to original image data. The image codec may be a still picture (Joint Photographic Experts Group) codec, a moving picture Experts Group codec, a wavelet codec, or the like. It is assumed that the image processor 290 has an on-screen display function, and may output on-screen display data according to a screen size controlled and displayed by the controller 250.

The display unit 190 displays an image signal output from the image processing unit 290 on a screen, and displays user data output from the control unit 250. The display unit 190 may use a liquid crystal display (hereinafter referred to as "LCD"), and in this case, the display unit 190 may include an LCD controller, a memory capable of storing image data, and an LCD display device. It can be provided. When the LCD is implemented using a touch screen method, the display unit 190 may operate as an input unit. As described with reference to the display unit 190 of FIG. 1, the display unit 190 may display channel information, a broadcast program, and the like under the control of the broadcast output control unit 185.

3 is an exemplary view of a display unit displaying a plurality of broadcast programs according to an embodiment of the present invention.

Referring to FIG. 3, a case in which the display unit 190 simultaneously displays four broadcast programs on one screen is illustrated. For example, when data is encoded at a data rate of 128 kbps, terrestrial DMB capable of supporting a data rate of 700 kbps on one physical channel may transmit about five broadcast programs. In this case, the transmitting side encodes and transmits the number of broadcast programs to be simultaneously displayed on one screen at four. When the channel supporting a plurality of broadcast programs is selected, the four broadcast programs may be displayed on one screen as shown in FIG. 3.

However, the example illustrated in FIG. 3 is merely an example and may be modified in various ways such as a vertically divided screen and a horizontally divided screen. When displaying a plurality of broadcast programs, information about broadcast programs, such as a title of a broadcast program and broadcast time information, may also be displayed.

4 is a diagram illustrating program information included in channels according to an embodiment of the present invention. The channel information is information including a program association table (hereinafter referred to as "PAT"), each channel number, a packet identifier for each channel (hereinafter referred to as "PID"), The number of broadcast programs supported by each channel is included.

A brief description of each item in the channel information shown in FIG. 4 is as follows.

1. table_id: PSI section information (for example, ID of PAT, PMT, CAT, NIT, etc.)

Section_syntax_indicator: '1'

Section_length: Length from section_length to the end of the section

4. transport_stream_id: Definition of the role and user of the level for identifying the transport stream (hereinafter referred to as "TS") in the network.

5. version_number: PAT version value, increased by 1 for each change of PAT

6. current_next_indicator

'1': Current PAT is valid-> Indicates current PAT version number is valid

'0': next PAT is valid-> next PAT version number is a valid value

7. section_number: Number of current section, number of first section is '0', incremented by 1 per section

8. last_section_number: Last section number

9. program_number: program_map_PID, that is, program number

10. number_of_program: By using the above-mentioned field, which is not used as a reserved number of broadcast programs, the present invention adds and transmits information on how many broadcast programs to display on one screen in this field.

11. network_PID: indicates PID of TS packet containing NIT information

12. program_map_PID: indicates PID of TS packet including program_map_section

5 is a diagram illustrating broadcast program information according to an embodiment of the present invention. The broadcast program information includes a program mapping table (hereinafter referred to as "PMT") and includes information about broadcast programs provided in a channel selected from the program assignment table.

A brief description of each item in the broadcast program information shown in FIG. 5 is as follows.

1. table_id: PSI section information (ID of PAT, PMT, CAT, NIT, etc.)

Section_syntax_indicator: '1'

Section_length: Length from section_length to the end of the section

4. program_number: The configuration for one program is transmitted in one TS_program_map_section, which indicates the program_number indicating the current TS_program_map_section.

5. version_number: PMT version value, increased by 1 for each PMT change

6. current_next_indicator

'1': Current PMT is valid-> Indicates current PAT version number is a valid value

'0': next PMT is valid-> next PAT version number is a valid value

7. section_number: Number of current section, number of first section is '0', incremented by 1 per section

8. last_section_number: Last section number

9. PCR_PID: PID value of TS packet with valid PCR used by program pointed to by program_number

10. program_info_length: Indicates the number of bytes of the descriptor length immediately following the program_info_length.

Stream_type: indicates the type of program_element included in the packet having the PID value indicated by elementary_PID.

12. elementary_PID: PID value of TS packet containing program elements

13. ES_Info_length: Indicates the number of bytes of descriptor length immediately after ES_Info_length.

6 is a diagram illustrating an example of a program allocation table and a program mapping table according to an embodiment of the present invention.

The program entry table 610 illustrated in FIG. 6 is an example configured with values of 'program_number', 'program_map_PID', and 'number of program' among the items of the channel information of FIG. 4. The values of the 'program_number' item represent the number of channels (eg, 5, 6, ..., 10) being provided. The values of the 'program_map_PID' items indicate packet identifiers (eg, 0x300, 0x400, ..., 0x800) that can identify channels being provided. The values of the 'number of program' item indicate the number of broadcast programs (eg, 4 and 1) provided by each channel.

The program mapping table 620 is an example configured with values of 'stream_type' and 'elementary_PID' among the items of the broadcast program information of FIG. 5. The program mapping table 620 is a table showing information on a broadcast program of a selected channel. The values of the 'stream_type' items include audio information whether the stream of the broadcast program provided in the selected channel is a video stream including video information. Indicates whether this is an audio stream. The values of the 'elementary_PID' item represent identifiers of the streams.

7 is an exemplary diagram of transport streams including channel information and broadcast program information according to an embodiment of the present invention.

Referring to FIG. 7, a PAT TS providing all information about programs provided by all channels has an identifier PID0. The PAT TS is a TS that provides details about each program, that is, information about each broadcast program. Each of the broadcast programs has identifiers PID100, PID200, PID300, and PID900. '0' in the PID0 is an identifier for identifying the stream including the PAT, and the PAT stream including the PAT information is repeatedly transmitted together with the PID0 identifier indicating the start of the information of the PAT during transmission. Referring to the PID0 stream shown in FIG. 7, it can be seen that broadcast programs provided by the channels include 'hero color', 'last emperor', 'sherlock holmes' and 'search channel'. In addition, 'program number 1', 'program number 2', 'program number 3', and 'program number 9' mean that the program numbers are 1, 2, 3, and 9, respectively, and that 'PMT_PID = 100' and 'PMT_PID' = 200 ',' PMT_PID = 300 ', and' PMT_PID = 900 'means that the PID of the PMT corresponding to each program is 100, 200, 300, 900 respectively. 'Number of program = 1' and 'number of program = 4' mean that the number of broadcast programs provided through each channel is one or four. If the number of broadcast programs is not one, one is a case where one broadcast program is normally provided on one screen. In addition, the case where a plurality of broadcast programs are provided on one screen is the case of the 'search channel' indicated by 'number of program = 4'. Here, the term 'channel' refers to a physical channel for providing a broadcast program and the like, and is used similarly to the term 'program' used in the present invention. The term 'broadcast program' refers to respective broadcasts provided through the respective channels.

If 'Hero color' is selected in the PID0 TS, if PMT_PID = 100 is downloaded, PMT4 is PID100, if 'Last Emperor' is selected, if PMT_PID = 200 is downloaded, PMT3 is PID200, if 'Sherlock Holmes' is selected, Since PMT_PID = 300, PMT2, which is PID300, is downloaded. If 'search channel' is selected, PMT1, which is PID900, is downloaded because PMT_PID = 900. As shown in FIG. 7, the PMT TS provides information on 'stream type', 'elementary stream', and 'PID'. The 'stream type' indicates whether the provided broadcast program is an audio stream or a video stream, the 'elementary stream' indicates a packet including a corresponding program element of TS, and the 'PID' includes a corresponding program element. Identifier of TS. A case of PID900 providing a plurality of broadcast programs in one screen among the examples shown in FIG. 7 will be described in detail with reference to the following. Since PID900 is a total of four broadcast programs provided by the TS, four broadcast programs are displayed on one screen. Also, since all the elementary types are 'Video', they are streams providing only video, and each broadcasting program 'video1' is represented by TS marked 'PID901', 'video2' is represented by 'PID902', and 'video3' 'Means' included in TS marked 'PID903' and 'video4' in TS marked 'PID904'. As such, when four broadcast programs are provided on one screen, the screen may be displayed in the form of the screen shown in FIG. 3.

8 is a diagram illustrating a decoding process of TSs received at a receiver according to an embodiment of the present invention. Some examples shown in FIG. 7 are used to help understand the description of the decoding process of FIG. 8.

Referring to FIG. 8, in step 810, the receiver 140 of FIG. 1 receives a signal including a PAT from a transmitter, and provides the signal to a broadcast signal decoder 155 and a system information decoder 165. do. The signal including the PAT is demodulated and decoded by the broadcast signal decoding unit 155 and the system information decoding unit 165. In step 820, the system information decoding unit 165 analyzes the demodulated and decoded PAT. The analyzed PAT may be shown as step 825 using the examples illustrated in FIG. 7. In step 830 it is checked whether a program is selected from the table information shown in step 825. If any one program is selected, in step 840, the receiver 140 receives a signal including a PMT corresponding to the selected program, and transmits the signal to the broadcast signal decoder 155 and the system information decoder 165. to provide. The signal including the PMT is demodulated and decoded by the broadcast signal decoding unit 155 and the system information decoding unit 165. In step 850, the system information decoding unit 165 analyzes the demodulated and decoded PMT. The analyzed PMT may be shown as in step 855 using the examples shown in FIG. 7. In step 860, the system information decoding unit 165 checks a value of 'number of program' of the program selected in the PAT, and confirms the number of broadcast programs provided in the PMT. The number of broadcast programs of the PAT identified in step 860 and the number of broadcast programs of the PMT are compared in step 870, and if the number of broadcast programs of the PAT and PMT matches, step 880 is performed. In step 880, all of the broadcast programs displayed in the PMT are decoded. In this way, all of the broadcast programs shown in step 855 are displayed on one screen under the control of the broadcast output controller 185. However, if the number of broadcast programs does not coincide with each other in step 870, the system information decoding unit 165 analyzes a 'descriptor ()' item in the PMT in step 890. In step 895, the system information decoding unit 165 decodes the broadcast programs as many as the number of broadcast programs specified in the 'descriptor ()' using the analyzed information. The decoded broadcast programs are displayed on the display unit under the control of the broadcast output controller 185.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

As described above, the present invention can display a plurality of broadcast programs simultaneously on one screen by providing a plurality of broadcast programs through one channel, and thus, there is an advantage in that the broadcast programs provided by all channels can be conveniently identified. .

Claims (18)

In a mobile communication system comprising a service provider for providing a broadcast program at a first data rate and a mobile terminal using the broadcast program, the service provider simultaneously provides at least two broadcast programs through one broadcast channel , Encoding respective streams of the broadcast programs and information about the number of the broadcast programs at a second data rate at least twice as low as the first data rate; And Multiplexing the streams of the encoded broadcast programs and transmitting the streams of the multiplexed broadcast programs and information about the number of encoded broadcast programs at the first data rate through the one broadcast channel; How to provide a broadcast program. The method of claim 1, wherein the second data rate, And a product of the second data rate and the number of broadcast programs is determined to be a maximum within a range not exceeding the first data rate. delete In a mobile communication system comprising a service provider for providing a broadcast program at a first data rate and a portable terminal using the broadcast program, the mobile terminal is to receive at least two broadcast programs at the same time through one broadcast channel In Receiving streams of broadcast programs encoded at a second data rate at least twice less than the first data rate and information on the number of broadcast programs; Decoding information regarding the streams of the received broadcast programs and the number of the received broadcast programs, respectively, at the second data rate; And And dividing one screen based on information about the number of decoded broadcast programs, and simultaneously displaying streams of the decoded broadcast programs on each of the divided screens. The method of claim 4, wherein the second data rate, And a product of the second data rate and the number of broadcast programs is determined to be a maximum within a range not exceeding the first data rate. delete delete In a mobile communication system comprising a service provider for providing a broadcast program at a first data rate and a portable terminal using the broadcast program, the service provider provides at least two broadcast programs simultaneously through one broadcast channel , An encoding unit for encoding streams of the broadcast programs and information about the number of the broadcast programs, respectively, at a second data rate at least twice lower than the first data rate; And And a transmitter configured to multiplex the streams of the encoded broadcast programs, and to transmit the streams of the multiplexed broadcast programs and information about the number of encoded broadcast programs at the first data rate through the one broadcast channel. Broadcast program providing device. The method of claim 8, wherein the second data rate, And a product of the second data rate and the number of broadcast programs is determined to be a maximum within a range not exceeding the first data rate. In a mobile communication system comprising a service provider for providing a broadcast program at a first data rate and a portable terminal using the broadcast program, the mobile terminal to receive at least two broadcast programs simultaneously through one broadcast channel In A receiver configured to receive streams of broadcast programs encoded at a second data rate at least twice lower than the first data rate and information on the number of the broadcast programs; A decoding unit for decoding the streams of the received broadcast programs and the information on the number of the received broadcast programs, respectively, at the second data rate; And And a controller configured to divide one screen based on the information about the number of decoded broadcast programs and to simultaneously display the streams of the decoded broadcast programs on each of the divided screens. The method of claim 10, wherein the second data rate, And a product of the second data rate and the number of broadcast programs is determined to be a maximum within a range not exceeding the first data rate. delete delete delete delete delete delete delete

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