KR20060091549A - Hierarchical transmission system in satellite-digital multimedia broadcasting (s-dmb) systems and method thereof - Google Patents

Abstract

In the system E-based satellite DMB system, a hierarchical transmission system and a method thereof in a satellite DMB system which gains through hierarchical reception in consideration of various environments such as processing capacity, screen size, and power consumption of a terminal Is initiated. The system includes a video encoder for receiving broadcast program related video data and generating layered video data using the SVC compressor method; A PES packetizer configured to receive each layered image data and generate a PES packet; A TS multiplexer for receiving each PES packet and generating a layered TS packet; Receiving the TS packet of a layer except the lowest layer among the layered TS packets, adding parity information to the TS packet, encoding Reed-Solomon, and simultaneously not restructuring the video data of the lowest layer A Reed-Solomon encoder for adding the parity information by including the program configuration information TS packet and encoding Reed-Solomon; A byte interleaver for byte interleaving the Reed Solomon encoded data; A convolutional encoder for convolutionally encoding the data of each byte interleaved layer for each layer; A bit interleaver for bit interleaving the convolutional coded data of each layer for each layer; And switching the bit interleaved data of each layer to match the transmission interval length of each layer of the super frame in order from the frame data of the lower layer to the frame data of the high layer. It consists of a CDM modulator for transmitting the CDM (Code Division Multiplexing) modulated together with the frame data of the other broadcast program layered through the same process.

Scalable Video Coding (SVC) Compression Method, Packetized Elementary Stream (PES) Packet, Transport Stream (TS) Packet

Description

Hierarchical Transmission System In Satellite-Digital Multimedia Broadcasting (S-DMB) Systems And Method Thereof}

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description of the present invention which serves to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is an exemplary view showing a structure of a transmission frame according to the present invention.

2 is a block diagram showing the internal structure of the transmitting side for applying the frame structure proposed in the present invention.

3 is a block diagram showing the internal structure of the receiving side for applying the frame structure proposed in the present invention.

4 and 5 are flowcharts illustrating operations of a transmitter and a receiver according to the present invention.

<Description of Signs for Main Parts of Drawings>

200: transmitter 21: video encoder

22: PES Packetizer 23: TS Multiplexer

24: Reed Solomon Encoder 25: Byte Interleaver

26: convolutional encoder 27: bit interleaver

28: CDM Modulator 31: Code Generator

32: CDM demodulator 33: hierarchical frame counter

34: Receive Controller 34-1: Comparator

34-2: Power Controller 34-3: Code Generation Controller

35: bit deinterleaver 36: internal decoder

37: byte deinterleaver 38: external decoder

39: PES Depacketizer 40: TS Demultiplexer

41: video decoder 300: receiver

The present invention relates to a satellite DMB related system. More specifically, when receiving broadcast data in a system E-based satellite DMB system, gain is obtained through hierarchical reception in consideration of various environments such as processing capacity, screen size, and power consumption of a terminal. The present invention relates to a hierarchical transmission system in a satellite DMB system and a method thereof.

System E-based satellite DMB (abbreviated as DMB) system is a one-way transmission system from a broadcasting station to a user, and provides various multimedia broadcasting services to satisfy target service quality in fixed reception, portable and mobile reception environments. It is a system. Here, the target quality of service is the lowest quality required by the user according to the satellite digital multimedia broadcasting transmission / reception matching standard of the Korea Information and Communication Technology Association. In the case of audio, the target quality of service corresponds to a high quality digital audio medium (CD) level. In addition, audio provided with video service is defined as analog FM quality, and video is defined as VCD quality based on 5 inch LCD. DMB-only terminals manufactured to meet this target quality of service have entered the commercialization stage for vehicles and portable devices.

However, as the user's desires such as miniaturization of the terminal, low price, and various functions increase, even if the DMB dedicated terminal satisfies the target service quality, in order to attract more service users, it must meet the buyer's product requirements in addition to the service quality. do. Accordingly, by combining DMB-only terminals with devices widely used such as mobile phones and PDAs, other types of terminals have been created that have higher functionality but lower relative prices to more satisfy buyers' needs. In general, terminals having more diverse functions have a function of adding satellite DMB service to existing devices, so that the external appearance such as the size of the terminal and the screen size does not greatly deviate from the existing framework. We are approaching familiarly.

As such, the appearance of the DMB terminal appears in various ways within the fixed framework of the existing satellite DMB system. Among them, the miniaturization and the diversification of the functions of the transformed products are due to the broadcasting service viewing time which did not appear in the conventional DMB terminal. It causes shortening problem and limitation of video service. To be more specific, the additional function requires a larger power capacity, but as the size decreases, the battery size is reduced, resulting in a shorter broadcast service viewing time. In addition, as the size of the video screen is reduced along with the terminal, all of the image information on the existing screen size may not be serviced or may provide a service quality more than necessary on the smaller screen.

Among these issues, efforts to overcome the power constraints have been actively conducted to develop a chip with low power consumption and to study algorithms for lowering power consumption.However, the solution for the video service constraint is how to process the data after receiving all the video information. It's limited to just this, and no gain in the PHY is generated at all. Accordingly, as a more effective alternative, it is necessary to re-examine the technologies and standards applied to the satellite DMB system. However, since it is impossible to make major modifications to the system, there is a need for a method of making a small change in the existing system to obtain an effect.

Accordingly, an object of the present invention is to solve various problems of the prior art, and an object of the present invention is to provide various environments such as processing capacity, screen size, and power consumption of a terminal when receiving broadcast data in a system E-based satellite DMB system. The present invention provides a hierarchical transmission system and a method in a satellite DMB system that benefits from hierarchical reception.

A hierarchical transmission system in a satellite DMB system according to the present invention comprises: a video encoder for receiving broadcast program related video data and generating layered video data using an SVC compressor method; A PES packetizer configured to receive each layered image data and generate a PES packet; A TS multiplexer for receiving each PES packet and generating a layered TS packet; Receiving the TS packet of a layer except the lowest layer among the layered TS packets, adding parity information to the TS packet, encoding Reed-Solomon, and simultaneously not restructuring the video data of the lowest layer A Reed-Solomon encoder for adding the parity information by including the program configuration information TS packet and encoding Reed-Solomon; A byte interleaver for byte interleaving the Reed Solomon encoded data; A convolutional encoder for convolutionally encoding the data of each byte interleaved layer for each layer; A bit interleaver for bit interleaving the convolutional coded data of each layer for each layer; And switching the bit interleaved data of each layer to match the transmission interval length of each layer of the super frame in order from the frame data of the lower layer to the frame data of the high layer. It characterized in that it comprises a CDM modulator for transmitting the CDM (Code Division Multiplexing) modulated together with the frame data of the other broadcast program layered through the same process.

A hierarchical transmission method in a satellite DMB system according to the present invention includes the steps of: a) determining, by a transmitter, whether broadcast program related information is image information or audio information and program configuration information; b) when the determination result of the step (a), the video information, the video encoder, receiving the broadcast program-related video data to generate the layered video data; c) A PES packetizer receives the layered image data to generate a packetized elementary stream (PES) packet, and a TS multiplexer receives each of the PES packets to layer the transport stream (TS) packet. Generating a; d) determining, by the transmitter, whether each layered video-related TS packet is a lower layer; e) If it is determined in step (d) that the respective TS-related TS packets are not the lowest layer, the Reed-Solomon encoder receives the TS-related TS packets and provides parity information to the TS packets. Adding and resolving Reed-Solomon encoding, and performing byte interleaving of the Reed-Solomon-coded data by the byte interleaver; f) a convolutional encoder convolutionally encoding the data of each byte interleaved layer for each layer, and the bit interleaver performing bit interleaving of the convolutional coded data of each layer for each layer; And g) the transmitter switches the data of each bit interleaved layer to match the transmission interval length of each layer of the super frame in order from the frame data of the low layer to the frame data of the high layer, and the CDM (Code Division Multiplexing) modulator, characterized in that it comprises the step of modulating the frame data of each layer and the frame data of the other layered broadcast program to transmit to the receiver.

According to the present invention, the power can be used for a longer time by not using the power required for processing the received data and the power associated with transmission frame reception during the dormant period, which can extend the broadcast service viewing time.

In the reference numerals to the components of the accompanying drawings, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, many specific details are set forth in the following description and in the accompanying drawings, in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In addition, detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention has a feature that complements the problems of the currently transformed terminal. That is, in order to solve the problem of shortening the broadcast service viewing time, the power consumption is reduced, and the terminal having the miniaturized screen size is provided with the required quality of service or the video information that is not serviced even when received is not received.

In addition, the present invention is characterized in that the service can be flexibly received according to the capability of the terminal in preparation for the form of the terminal to be continuously changed and varied. Here, the capability of the terminal not only means battery capacity and screen resolution, but also includes data processing speed and data processing capability.

In addition, the present invention is characterized by minimizing the investment cost by minimizing the existing system to meet the above two features.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 and 5 as follows.

First, the transmission frame structure between the broadcast station and the terminal proposed by the present invention will be described in detail.

1 is an exemplary view showing a structure of a transmission frame according to the present invention.

As shown in the drawing, each terminal is divided into several layers to receive data only in a corresponding reception section, and the remaining sections are defined as dormant sections and do not receive during this period.

The lowest layer receives only the fewest frames and has the longest dormant period. The terminal in the upper layer of the lowest layer receives the frame received by the terminal in the lower layer and one extended frame in time. In this way, the terminal with the higher hierarchical layer receives all the frames received by the lower layer terminal and receives another frame extended in time. Finally, the terminal of the uppermost layer receives all frames without a sleep interval.

The structure of the transmission frame is further described as follows.

As shown, the length of the transmission frame (super frame) is 76.5 ms, which is the same as the super frame length in the existing satellite DMB system.

However, unlike the conventional method in which six frames are bundled to form a super frame, N hierarchical frames form a super frame. The length of one hierarchical frame is arbitrarily determined so that it is an integer multiple of the existing frame length of 12.75 ms. Therefore, N can be an integer value between a minimum of one and a maximum of six.

The terminal receiving the hierarchical frame is also divided into layers, and the reception interval according thereto is determined from the transmission interval of the lowest layer frame 1 to the transmission interval of the corresponding layer frame according to each layer of the terminal as shown in FIG. 1. Accordingly, the terminal corresponding to the layer 1 receives only the layer frame 1, and the terminal corresponding to the layer N receives all the layer frames.

When the corresponding reception period ends in one super frame transmission period, the UEs of the other layers except the highest layer N have a dormant period. In addition, the transmission order is from the lower layer frame to the higher layer frame, and is repeatedly transmitted at the interval of the total N layer frame lengths (one super frame length).

For the above-described transmission frame structure, some considerations and transmission apparatuses for the transmitter and the receiver of the existing satellite DMB system are required.

2 is a block diagram showing the internal structure of the transmitter to apply the frame structure proposed in the present invention, Figure 3 is a block diagram showing the internal structure of the receiver to apply the frame structure proposed in the present invention.

As shown therein, the transmitter 200 includes: a video encoder 21 for receiving broadcast program related video data and generating layered video data by using a scalable video coding (SVC) compressor method; A PES packetizer 22 for receiving the layered image data and generating a packetized elementary stream (PES) packet; A TS multiplexer (23) for receiving each PES packet and generating a layered TS (Transport Stream) packet; Receives TS packets of layers (layers 2 to N) except the lowest layer among the layered TS packets, adds parity information to the TS packets, encodes Reed Solomon, and images of the lowest layer (layer 1). A Reed-Solomon encoder (24) for adding the parity information by including the voice information TS packet and the program configuration information TS packet which are not layered in the data and then adding parity information; A byte interleaver (25) for byte interleaving the Reed Solomon encoded data; A convolutional encoder 26 convolutionally encoding data of each byte-interleaved layer for each layer; A bit interleaver (27) for bit interleaving the convolutional coded data of each layer for each layer; The data of each bit interleaved layer is switched to match the transmission interval length of each layer of the super frame of FIG. 1 in order from the frame data of the lower layer to the frame data of the higher layer. It is composed of a CDM modulator 28 for transmitting the CDM (Code Division Multiplexing) modulated together with the data and the frame data of the other broadcast program layered through the above process.

In addition, the receiver 300 generates a Walsh code, which is a spreading code of a pilot signal, and at the same time receives the code information about a corresponding data channel from a code generation controller, which will be described later, for use in CDM demodulation. A code generator 31 for generating a; A CDM demodulator (32) for CDM demodulating a data channel and a pilot channel comprising the Walsh code; A layer frame counter 33 for calculating which layer the current layer frame belongs to after obtaining frame counter information among symbols of the pilot channel; Comparator 34-1 which receives the calculated layer of the current frame and the layer of the predetermined terminal and compares the two values, and when the layer of the terminal is higher than the current frame layer, determines that it is a dormant period and receives the next. The power controller 34-2 which turns off the CDM demodulator until the interval comes, and when the layer of the terminal is lower than the current frame layer, determines the receiving section and receives the broadcast program desired by the user. A reception controller (34) configured with a code generation controller (34-3) for transferring code information about the corresponding data channel to the receiver; A bit deinterleaver (35) for switching the frame data of the data channel for the corresponding CDM demodulated program according to the reception time of each layer frame allocated to the terminal layer and receiving and deinterleaving the bit data; An internal decoder 36 for decoding the frame data of each layer for each layer; After receiving the decoded data and performing byte deinterleaving, the byte deinterleaver 37 separates and outputs the video data of each layer, the audio data belonging to the first layer data, the program configuration information data, and the first layer image data. )Wow; An external decoder 38 for receiving and decoding data of each layer, and outputting TS packets, voice information TS packets, and program configuration information TS packets of each layer; A TS demultiplexer (39) and a PES depacketizer (40) for TS demultiplexing and PES depacketizing the output packets of each layer; The video decoder 41 receives the TS demultiplexed and PES depacketized packets for each layer and decodes the image information.

Hereinafter, operations of the transmitter and the receiver according to the present invention configured as described above will be described in detail with reference to FIGS. 4 to 5.

As shown in FIG. 1, terminals of other layers except the terminal of the highest Nth layer receive one layer frame in a frame received by the terminal on one layer higher than the terminal and serve. In other words, the video information must exist hierarchically in each hierarchical frame because the service should be provided as a part of the frame received by the terminal one layer above the hierarchical frame. Therefore, layering of image compression is necessary.

First, the transmitter 200 determines the type of broadcast program related information (S401). That is, it is determined whether the broadcast program related information is image (video) information or audio information and program configuration information. This is because audio information and program configuration information are required in addition to the image (video) information in order to configure one broadcast program.

As a result of the determination in step S401, when the broadcast program related information is video (video) information, the video encoder 21 receives broadcast program related video data and is currently SVC (Scalable) being standardized in MPEG-21. Using the video coding) compression method, layered image data is generated (S402). Here, the SVC compression method is a compression technique that can arbitrarily change the size of data by adjusting the number of pixels of the image and the number of frames per second (video scenes per second) of the video. Or split the video footage to compress each piece of data. Using the SVC method in this way, the compressed image data includes image information independent of each other and has a hierarchical structure.

Thereafter, the PES packetizer 22 receives each layered image data to generate a packetized elementary stream (PES) packet (S403), and the TS multiplexer 23 generates the PES packet. After receiving the input layer to generate a layered TS (Transport Stream) packet and outputs to the Reed Solomon encoder 24 (S404).

On the other hand, if the broadcast program related information is voice information and program configuration information as a result of the determination in step S401, the transmitter 200 converts the respective information into voice information TS and program configuration information TS, and then Output to the Reed Solomon encoder 24 (S405). Since the voice information and the program configuration information are not layered through the PES packetizer 22 and the TS multiplexer 23, the amount of the voice information and the program configuration information is smaller than that of the video information. will be.

Thereafter, the transmitter 200 determines whether each of the layered image-related TS packets is the lowest layer (layer 1) (S406).

As a result of the determination in step S406, when each layered TS packet is not the lowest layer (layer 2 to layer N), the Reed Solomon encoder 24 receives the layered TS packets. After adding the parity information to the TS packet, Reed-Solomon encoding is performed (encoding) (S407).

On the other hand, when the determination result of step S406 indicates that each of the layered TS packets related to each layer is the lowest layer (layer 1), the Reed-Solomon encoder 24 is not layered on the image data of the lowest layer (layer 1). After adding the parity information by including the voice information TS packet and the program configuration information TS packet, Reed-Solomon encoding (encoding) is performed (S408).

Subsequently, the byte interleaver 25 performs byte interleaving on the Reed Solomon-coded data (S409). In this case, the byte interleaving process is performed in each layer so that data is not mixed between layers.

Subsequently, the convolutional encoder 26 convolutionally encodes data of each byte interleaved layer for each layer (S410), and the bit interleaver 27 bit interleaves the data of each convolutional encoded layer for each layer (S411). ).

Subsequently, the transmitter 200 switches the bit interleaved data of each layer to match the transmission interval length of each layer of the super frame of FIG. 1 in order from the frame data of the lower layer to the frame data of the higher layer. And outputs the frame data of each switched layer and the frame data of another broadcast program layered through the same process to the code division multiplexing (CDM) modulator 28, and transmits the code division multiplexing (CDM) modulator ( 28 modulates the frame data of each layer and the frame data of another broadcast program and transmits it to the receiver (S412).

Hereinafter, an internal structure of a receiver for receiving the transmitted layered data (broadcast program) and outputting the demodulated and decoded process will be described with reference to FIG. 5.

First, the receiver 300 determines the layer of the terminal based on the screen size of the terminal, available power and processing capacity (S501).

Then, the receiver 300 receives the layered frame from the transmitter 200 (S502). In this case, in order to receive data only during a reception period allocated to the corresponding terminal, it is necessary to distinguish a layer frame currently received. The satellite DMB system has a pilot channel for sending control-related symbols in addition to the CDM channel for sending data. The fourth symbol of this pilot channel has a hierarchical frame counter 33 which indicates how many times a received frame is located in one super frame. Using this, each hierarchical frame length is an integer multiple of the frame length and the value is preset. As we know it, we can distinguish the current hierarchy frame.

Thereafter, the code generator 31 generates a Walsh code, which is a spreading code of a pilot signal, and receives code information about a corresponding data channel from the code generation controller 34-3 for use in CDM demodulation. The corresponding code is generated by reference, and the CDM demodulator 32 CDM demodulates a pilot channel including the Walsh code (S503). In addition, the CDM demodulator 32 undergoes a predetermined comparison and determination process by the hierarchical frame counter 33 and the reception controller 34 to CDM demodulate a data channel, which will be described.

The layer frame counter 33 of the reception controller 34 obtains frame counter information among symbols of the pilot channel, and then calculates which layer the current layer frame belongs to, and the comparator 34-1 calculates the calculated layer. The layer of the current frame and the layer of the predetermined terminal are received and the two values are compared (S504).

As a result of the comparison of the step S504, when the layer of the terminal is higher than the current frame layer, it is determined as a dormant interval until the next reception interval, that is, until receiving the next layer frame, the power controller 34-2 The CDM demodulator 32 is turned off by outputting a control signal () (S505).

 On the other hand, as a result of the comparison of the step (S505), if the layer of the terminal is lower than the current frame layer is determined as the reception interval, the code generation controller 34-3 receives the user's desired broadcast program input The code generator 31 transmits code information about a corresponding data channel to the code generator 31, and the CDM demodulator 32 receives code information about the data channel and generates the corresponding code by referring to the code information about the data channel. The code is received from the CDM demodulated data channel (S506).

Thereafter, the receiver 300 determines whether the frame data of the demodulated data channel is the lowest layer (layer 1) (S507).

As a result of the determination in step S508, when the frame data is not the lowest layer (Layer 2 to Layer N), the bit deinterleaver 35 receives the frame data of the data channel for the corresponding broadcast program CDM demodulated. The receiver is switched according to the reception time of each layer frame allocated to the layer of the terminal by the receiver, and is transmitted and received, bit deinterleaving (S508), and the internal decoder 36 and the byte deinterleaver 37 transmit the bit deinterleaver. The interleaved hierarchical frame data is independently processed for each layer to perform internal decoding and byte deinterleaving (S509). The processes of bit deinterleaving and channel internal decoding are inverse processes of bit interleaving and channel internal encoding of the transmitter 200, and are processed by inputting layers in order.

Thereafter, the outer decoder 38 receives and decodes the image frame data of each layer, and then outputs the image TS packets of each layer (S510), and the TS demultiplexer 39 and the PES depacket tie. The depacketizer 40 receives the video TS packets of each layer and demultiplexes TS and depacketizes the PES (S511). Here, at the time of Reed Solomon encoding (externalization), in the layer (layer 2 to layer N), since the layered image data has only Reed Solomon encoding (externalized) the image TS packet through the Reed Solomon encoder 38, As the reverse process, only the layered image TS packets are output after the externalization, and only the image data of each layer remains after the TS demultiplexing and PES depacketizing process.

Thereafter, the video decoder 41 receives decoded packets for each layer decoded according to the TS demultiplexed and PES depacketized as a deco corresponding to the SVC of the transmitter 200 and decoded into image information ( S512). In this case, the amount of data input to the image decoder varies according to the layer of the terminal. Since the layer of the terminal is already determined before receiving the frame, the amount of data input to the video decoder 41 is predetermined.

Meanwhile, as a result of the determination in step S508, when the frame data is the lowest layer (layer 1), the frame data corresponding to the lowest layer (layer 1) is bit deinterleaved (S513).

Thereafter, the internal decoding and byte deinterleaving processes are performed by the internal decoder 36 and the byte deinterleaver 37 in the same manner as in step S509 (S514 to S515). As described above, the process of channel internal decoding and bit deinterleaving is the same as the reverse process of bit interleaving and channel internal encoding of the transmitter 200. In this case, the byte deinterleaver 37 separates and outputs the audio data, the program configuration information data, and the first layer video data, which belonged to the first layer data.

Subsequently, the external decoder 38 receives and decodes the image data, the audio data, and the program configuration information data that belonged to the first hierarchical frame data, and then the image TS packet, the voice information TS packet, and the program configuration information TS packet. Are generated, and the video TS packet is decoded into video information through the steps S511 to S512, and the audio information TS packet and the program configuration information TS packet are used as they are during the broadcast program service (S516).

Although the present invention has been described as a specific preferred embodiment, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the gist of the present invention as claimed in the claims. Anyone with a variety of variations will be possible.

Therefore, according to the present invention, the power can be used longer by not using the power required for processing the received data and the power associated with transmission frame reception during the dormant period, which can extend the broadcast service viewing time.

In addition, in the present invention, the screen size is reflected in determining the layer of the terminal to receive and service the data amount corresponding to the screen size. That is, the smaller the screen size of the terminal, the lower the terminal layer to receive fewer frames. As the screen size is smaller, the length of the reception section is shorter and the length of the dormant section is longer. Serve but benefit from power savings.

In addition, the present invention can adjust the desired video quality of service and battery consumption time by changing the layer of the terminal according to the user's intention. Depending on the amount of remaining battery power, users can reduce power consumption arbitrarily, as well as select higher quality of service for media that requires higher quality, such as movies and music videos, and lower quality such as news. For the required media, the quality of service may be selected according to the type of broadcast program desired, such as selecting a low quality of service.

In addition, since the present invention determines the number of frames to be received depending on the layer of the terminal, it is possible to reduce the data processing speed of the terminal to be changed later. In other words, it is possible to reduce the restriction on the data processing speed of the real-time service by receiving an appropriate amount of data in accordance with the data processing speed of the terminal without having to receive all the data.

Claims (14)

A video encoder receiving image data related to a broadcast program and generating layered image data by using a scalable video coding (SVC) compressor method; A PES packetizer for receiving each layered image data and generating a packetized elementary stream (PES) packet; A TS multiplexer for receiving each PES packet and generating a layered TS (Transport Stream) packet; Receiving the TS packet of a layer except the lowest layer among the layered TS packets, adding parity information to the TS packet, encoding Reed-Solomon, and simultaneously not restructuring the video data of the lowest layer A Reed-Solomon encoder for adding the parity information by including the program configuration information TS packet and encoding Reed-Solomon; A byte interleaver for byte interleaving the Reed Solomon encoded data; A convolutional encoder for convolutionally encoding the data of each byte interleaved layer for each layer; A bit interleaver for bit interleaving the convolutional coded data of each layer for each layer; And The bit interleaved data of each layer is switched to match the transmission interval length of each layer of the super frame in order from the frame data of the lower layer to the frame data of the high layer. And a CDM modulator for modulating and transmitting code division multiplexing (CDM) modulated frame data of another broadcast program layered through the same process. The method of claim 1, wherein the lowest layer is Layer 1, and the layer except for the lowest layer is any one of layers 2 to N, hierarchical transmission system in a satellite DMB system. The method of claim 1, wherein the Reed Solomon encoder, And a reed-solomon encoding of voice information TS and program configuration information TS according to voice information and program configuration information in addition to the broadcast program related image data. The system of claim 1, wherein the system is A code generator for generating a Walsh code, which is a spreading code of a pilot signal, and simultaneously receiving code information about a corresponding data channel from a code generation controller to generate a corresponding code, for use in CDM demodulation; A CDM demodulator for CDM demodulating a data channel and a pilot channel comprising the Walsh code; A layer frame counter for calculating which layer the current layer frame belongs to after obtaining frame counter information among symbols of the pilot channel; A comparator that receives the calculated layer of the current frame and the layer of a predetermined terminal and compares the two values. When the layer of the terminal is higher than the current frame layer, the comparator determines that it is a dormant interval until the next reception interval. Power controller to turn off the CDM demodulator, and if the layer of the terminal is lower than the current frame layer, it is determined that the receiving interval, the user receives a broadcast program desired code generation to transmit the code information about the data channel to the code generator A receiving controller configured as a controller; A bit deinterleaver for receiving bit deinterleaving after switching frame data of a data channel of a corresponding CDM demodulated program according to a reception time of each layer frame allocated to a terminal layer; An internal decoder to decode frame data of each layer for each layer; A byte deinterleaver that receives the decoded data and deinterleaves the bytes, and separates and outputs the video data of each layer, the audio data and program configuration information data belonging to the first layer data, and the first layer image data, respectively; An external decoder that receives and decodes the data of each layer and outputs TS packets, voice information TS packets, and program configuration information TS packets of each layer; A TS demultiplexer and a PES depacketizer for TS demultiplexing and PES depacketizing the output packets of each layer; And And a video decoder which receives the TS demultiplexed and PES depacketized packets for each layer and decodes the image information into image information. a) determining, by the transmitter, whether the broadcast program related information is image information or audio information and program configuration information; b) if the video information is determined as the result of step (a), generating a layered video data by receiving a video encoder related video data; c) A PES packetizer receives the layered image data to generate a packetized elementary stream (PES) packet, and a TS multiplexer receives each of the PES packets to layer the transport stream (TS) packet. Generating a; d) determining, by the transmitter, whether each layered video-related TS packet is a lower layer; e) If it is determined in step (d) that the respective TS-related TS packets are not the lowest layer, the Reed-Solomon encoder receives the TS-related TS packets and provides parity information to the TS packets. Adding and resolving Reed-Solomon encoding, and performing byte interleaving of the Reed-Solomon-coded data by the byte interleaver; f) a convolutional encoder convolutionally encoding the data of each byte interleaved layer for each layer, and the bit interleaver performing bit interleaving of the convolutional coded data of each layer for each layer; And g) the transmitter switches the data of each bit interleaved layer from the lower layer frame data to the higher layer frame data so as to match the transmission interval length of each layer of the super frame, and the CDM (Code Division) And a modulator modulating the switched frame data of each layer and the frame data of another layered broadcast program and transmitting the modulated frame data to a receiver. The method of claim 5, wherein the layered image data of the step, Generated by SVC (Scalable Video Coding) compression method, the pixel is divided by the desired number of layers or the video scene is divided into respective data, and the compressed video data includes independent image information and layer A hierarchical transmission system in a satellite DMB system, characterized in that it has a structure. The method of claim 5, wherein step (b) As a result of the determination in step (a), when the broadcast program related information is voice information and program configuration information, the transmitter converts the information into voice information TS and program configuration information TS, and then converts the information to the Reed Solomon encoder. Hierarchical transmission method in a satellite DMB system characterized in that the output. The method of claim 5, wherein the lowest layer, Layer 1, and the layer except for the lowest layer is any one of layers 2 to N, hierarchical transmission system in a satellite DMB system. The method of claim 5, wherein the byte interleaving of step (e), A hierarchical transmission method in a satellite DMB system characterized in that the data is made in each layer so that data is not mixed between layers. The method of claim 5, wherein step (e) As a result of the determination in the step (d), when each of the layered TS packets is the lowest layer, the Reed Solomon encoder determines the voice information TS packet and the program configuration information TS packet that are not layered on the image data of the lowest layer. A method of hierarchical transmission in a satellite DMB system, which includes adding parity information and including Reed Solomon encoding. The method of claim 5, wherein the method is h) determining, by the receiver, the layer of the terminal based on the screen size, available power and processing capacity of the terminal; i) the receiver receiving a layered frame from the transmitter; j) The code generator generates a Walsh code, which is a spreading code of the pilot signal, and at the same time receives the code information about the data channel from the code generation controller to generate the corresponding code by using the code generation controller. A CDM demodulator, CDM demodulating a pilot channel comprising the Walsh code; k) After the layer frame counter obtains the frame counter information among the symbols of the pilot channel, it calculates which layer the current layer frame belongs to, and the comparator calculates the layer of the calculated current frame and the layer of the predetermined terminal. Receiving an input and comparing the two values; l) as a result of determining in step (k), turning off the CDM demodulator by outputting a control signal to the power controller until the next hierarchical frame is determined when the terminal layer is higher than the current frame layer. ; m) receiving, by the CDM demodulator, code information about the data channel and receiving the code from a code generator for generating a corresponding code by referring to the code information; And n) determining, by the receiver, whether the frame data of the demodulated data channel is the lowest layer o) If the frame data is not the lowest layer as a result of the determination of step (n), the bit deinterleaver transmits the frame data of the data channel for the corresponding broadcast program CDM demodulated to the layer of the terminal by the receiver. It is switched according to the reception time of each allocated layer frame and then received and deinterleaved. The internal decoder and the byte deinterleaver process the bit deinterleaved layer frame data independently for each layer to perform internal decoding and byte deinterleaving. Interleaving; p) After the external decoder receives and decodes the video frame data of each layer, the external decoder outputs the video TS packets of each layer, and the TS demultiplexer and the PES depacketizer output the video TS of each layer. Receiving the packet and demultiplexing and depacketizing the PES; And q) a hierarchical transmission method of a satellite DMB system, further comprising the step of receiving, by the video decoder, the TS-demultiplexed and PES depacketized packets for each layer into image information; . The method of claim 11, wherein the layered frame of the step (i), And using the hierarchical frame counter indicating which frame is received as a fourth symbol of a pilot channel within a super frame. The method of claim 11, wherein step (l) comprises: As a result of the determination of step (k), when the terminal layer is lower than the current frame layer, it is determined as the reception section, and the code generation controller receives a broadcast program desired by the user and codes the code for the corresponding data channel with the code generator. A method of hierarchical transmission in a satellite DMB system, comprising the step of transferring information. The method of claim 11, wherein step (o) is o-1) If the frame data is the lowest layer as a result of the determination of step (n), bit deinterleaving the frame data corresponding to the lowest layer, and the internal decoder and the byte deinterleaver debit the bit data Decoding and byte deinterleaving the frame data; o-2) separating and outputting the audio data, the program configuration information data, and the first layer video data belonging to the first layer data, respectively, by the byte deinterleaver; And o-3) After the external decoder receives and decodes the video data, the audio data, and the program configuration information data that belonged to the first layer frame data, it outputs the video TS packet, the audio information TS packet, and the program configuration information TS packet. Hierarchical transmission method in a satellite DMB system, characterized in that it comprises a step of.

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