KR20100067591A - At-dmb transmitting and receiving system for providing conditional access broadcasting service and method thereof - Google Patents

Abstract

PURPOSE: An AT-DMB transmission for offering a conditional access broadcast service and a method thereof are provided to solve a problem that the effective transmission amount of the existing T-DMB shrinks due to the increase of conditional access data through increased available transmission. CONSTITUTION: A conditional access message encoding unit(110) encodes the conditional access subscriber data, the encoded data is changed into limit received data. A basic area scrambling unit(120) is created the scrambled basic field stream. An enhancement area scrambling unit(130) is created the scrambled improvement domain stream. An ensemble multiplexing unit(140) constitutes the basic field ensemble transport interface frame [basic area ensemble transmission interface frame] and improvement domain ensemble transport interface frame.

Description

AT-DMB Transmitting and Receiving System for Providing Conditional Access Broadcasting Service and Method Thereof

The present invention relates to a conditional access device for providing a terrestrial digital multimedia broadcasting service. In particular, the present invention relates to a conditional access broadcast service in an advanced terrestrial digital multimedia broadcasting (hereinafter referred to as AT-DMB) system. The present invention relates to an AT-DMB transmission and reception system and a method thereof.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2006-S-017-03, Task name: Development of advanced terrestrial DMB transmission technology .

Since terrestrial digital multimedia broadcasting (T-DMB) services have been commercialized recently, discussions about the payment of data broadcasting services have been continuously made to activate the industry.

The provision of such a monetization service is made possible by the application of the limited reception system.

1 is a block diagram schematically illustrating a configuration of a conditional access system in T-DMB currently standardized and applied according to the prior art.

The limited reception system according to the related art includes a limited reception message encoder 10, a scrambler 20, an MPEG-2 multiplexer 30, an ensemble multiplexer 40, and a modulator 50.

The limited reception message encoder 10 receives the limited reception subscriber data from the outside and encodes the received limited reception data to transmit the encoded limited reception data to the MPEG-2 multiplexer 20.

In this case, the limited reception data includes an entitlement control message (ECM) consisting of an encrypted control word and a control variable, and an entitlement management message for granting a viewer the right to watch a corresponding program. , Hereinafter referred to as 'EMM').

The scrambler 20 receives the unscrambled data and scrambles it using a key value for scramble received from the limited reception message encoder and transmits the scrambled stream to the MPEG-2 multiplexer 30.

The MPEG-2 multiplexer 30 receives the limited reception data from the limited reception message encoder 10 and the scrambled stream from the scrambler 20 and multiplexes the same to generate one MPEG-2 stream.

The ensemble multiplexer 40 receives an MPEG-2 stream from the MPEG-2 multiplexer 30 and receives a fast information channel (FIC) including service configuration information, service component information, and multiplex configuration information from the outside. Contents for other services are input and multiplexed to generate an Ensemble Transport Interface (ETI) frame for a T-DMB broadcast service.

The modulator 50 receives an ETI frame generated from the ensemble multiplexer 40 and provides a service.

AT-DMB is a broadcasting system that extends the capacity of transmission data up to 2 times by adding a new layer modulation method based on T-DMB.

Since AT-DMB can provide more broadcasting services than T-DMB, it is necessary to consider a paid service with a limited reception system.

In T-DMB, the limited reception data and the existing broadcast stream must be transmitted together.

Therefore, in T-DMB, when the number of limited reception service subscribers increases, the amount of limited reception data also increases, thereby reducing the amount of data for the basic broadcast service in a limited amount of broadcast channel transmission.

AT-DMB, which is different from the existing T-DMB system, needs a method of applying a conditional access system for providing a paid service.

In order to solve this problem, the present invention is to provide an AT-DMB transmission and reception system and method for providing a limited reception broadcast service.

According to an aspect of the present invention, there is provided an AT-DMB transmission system including: a limited reception message encoder for receiving and encoding limited reception subscriber data and converting the received reception subscriber data into limited reception data; A base region scrambler configured to generate a scrambled base region stream using a key value for scramble received from the conditional access message encoder; An enhancement region scrambler configured to generate a scrambled enhancement region stream using a key value for scramble received from the conditional access message encoder; And an enhancement region ensemble for receiving a fast information channel indicating service configuration information, the scrambled enhancement region stream and the basic region stream, and the limited reception data, and transmitting a basic region ensemble transmission interface frame and the limited reception data. And an ensemble multiplexer constituting a transmission interface frame, wherein the basic region ensemble transmission frame transmits limited reception related information indicating that the limited reception data has been allocated to a subchannel of an enhancement region to a fast information channel of the basic region.

The AT-DMB transmission method according to an aspect of the present invention includes the steps of: (a) receiving and encoding the limited reception subscriber data into the limited reception data; (b) the scrambler generating a scrambled base region stream and a scrambled enhancement region stream using key values for scramble received from the conditional access message encoder; And (c) the ensemble multiplexer receives a fast information channel indicating service configuration information, the scrambled base region stream, the scrambled enhancement region stream, and the limited reception data to receive the limited reception data. And transmitting the limited reception related information indicating that the reception is allocated to the sub-channel of the enhancement region to the high-speed information channel of the basic region and transmitting the limited reception data through the sub-channel dedicated to the limited reception data of the enhancement region.

The AT-DMB receiving system according to an aspect of the present invention comprises: a demodulator unit which hierarchically demodulates a terrestrial digital multimedia broadcasting signal received from a transmission system for providing a limited reception broadcast service and outputs a basic area service signal and an enhanced area service signal; An ensemble demultiplexer which receives the base area service signal or the enhancement area service signal from the demodulator and demultiplexes and outputs the high speed information channel of the base area or the high speed information channel of the enhancement area; Analyzing the fast information channel of the demultiplexed basic region, extracting the restriction reception related information, and finding a specific sub-channel having the restriction reception data of the enhancement region based on the extracted restriction reception related information; A basic region fast information channel analyzer for finding a scrambled enhancement region stream; And a limited reception message decryption unit configured to decode the limited reception data to find a key value related to descrambling and to use the same to descramble the scrambled base region stream and the scrambled enhancement region stream.

By the above-described configuration, the present invention provides an AT-DMB transmission and reception system for providing a paid service while having compatibility with an existing T-DMB system.

The present invention can solve the problem that the effective transmission amount of the existing T-DMB decreases due to the increase in the limited reception data when the number of subscribers is increased through the increased available transmission amount of the AT-DMB.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “block”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

In the AT-DMB, the existing T-DMB service is called a basic area service, and the layer-modulated service is called an enhanced area service.

2 is a block diagram schematically illustrating a configuration of an AT-DMB transmission system for providing a conditional access service according to an embodiment of the present invention, and FIG. 3 is an AT-DMB transmission system according to an embodiment of the present invention. The structure of the base area ETI frame and the enhancement area ETI frame is shown.

The AT-DMB transmission system 100 according to the embodiment of the present invention includes a limited reception message encoder 110, a basic region scrambler 120, an enhancement region scrambler 130, and an AT-DMB ensemble multiplexer 140. ) And the modulator unit 150 for AT-DMB.

The limited reception message encoder 110 receives and encodes the limited reception subscriber data from the outside, generates a key value for scramble, and transmits the generated key value to the basic region scrambler 120 and the enhancement region scrambler 130.

The limited reception message encoding unit 110 receives the limited reception subscriber data from the outside, encodes the encoded limited reception data (ECM and EMM), and transmits the encoded limited reception data (ECM and EMM) to the AT-DMB ensemble multiplexer 140. At this time, the AT-DMB operator may determine whether to perform scramble for services in the basic area and the enhancement area.

The base area scrambler 120 generates and transmits a scrambled base area stream using a key value for scramble received from the base area stream and the conditional access message encoder 110.

The enhancement region scrambler 130 generates and transmits the scrambled enhancement region stream by using the enhancement region stream and the key value for the scramble received from the conditional access message encoder 110.

The AT-DMB ensemble multiplexer 140 includes a fast information channel (hereinafter, referred to as a 'FIC') indicating service configuration information from the outside and an ECM, an EMM and a basic area from the limited reception message encoder 110. The scrambled or unscrambled base region stream from the scrambler 120 and the scrambled or unscrambled enhancement region stream are received from the enhancement region scrambler 130.

Ensemble multiplexer 140 for AT-DMB multiplexes the input FIC, ECM, EMM, scrambled or unscrambled base region stream, scrambled or unscrambled enhancement region stream, and enhances the base region ETI frame 200. The area ETI frame 210 is configured.

Here, as shown in FIG. 3, the base area ETI frame 200 includes a base area ETI header 202, a base area FIC 204, a base area service 1 206, and a base area service N 208. And enhancement area ETI frame 210 includes enhancement area ETI header 212, enhancement area FIC 214, enhancement area service 1 216, enhancement area service N 218, and limited receive data channel 219. .

In other words, the base area ETI frame 200 is composed of a base area FIC 204 with limited reception related information, a scrambled base area stream and an unscrambled base area stream, and the enhancement area ETI frame 210 is a scrambled enhancement. It consists of a region stream and an scrambled enhancement region stream. Here, the limited reception related information includes information indicating that limited reception data has been allocated to a subchannel of the enhancement region and information for descrambled scrambled stream.

The AT-DMB ensemble multiplexer 140 allocates and transmits a separate subchannel in the added enhancement region without transmitting all the input ECM and EMM with the stream scrambled as in the conventional scheme.

Also, the AT-DMB ensemble multiplexer 140 may be configured to transmit the limited reception related information through the enhancement region FIC 214 without transmitting the limited reception related information through the basic region FIC 204.

The AT-DMB ensemble multiplexer 140 does not send the ECM and the EMM to the base area, but to the added enhancement area so that the effective transmission amount of the base area is not lost.

The AT-DMB ensemble multiplexer 140 may add and transmit an ECM having a small amount of data to each scrambled channel, and transmit an EMM in which the amount of data increases according to a subscriber through a separate subchannel of the enhancement region.

The AT-DMB ensemble multiplexer 140 configures an ETI frame to transmit the basic area to the AT-DMB modulator unit in the same manner as the existing T-DMB, and allocates an enhanced area to a limited reception data channel such as ECM and EMM. One ETI frame is constructed and transmitted to the AT-DMB modulator section.

The AT-DMB modulator unit generates and transmits an AT-DMB signal by hierarchically modulating the base area ETI frame 200 and the enhancement area ETI frame 210.

4 is a block diagram schematically illustrating a configuration of an AT-DMB receiving system for providing a conditional access service according to an embodiment of the present invention.

The AT-DMB receiving system 300 according to the embodiment of the present invention includes an AT-DMB demodulator 310, an AT-DMB ensemble demultiplexer 320, a basic area FIC analyzer 330, and a limited reception message. The decoder 340 includes a base region descrambler 350, an enhancement region descrambler 360, and a system controller 370.

The AT-DMB demodulator 310 hierarchically demodulates the AT-DMB signal received from the AT-DMB transmission system 100 and outputs the basic area service signal and the enhanced area service signal.

The AT-DMB ensemble demultiplexer 320 demultiplexes the base area service signal and the enhanced area service signal multiplexed from the AT-DMB demodulator unit 310 into respective streams, data, and content information. In addition, the AT-DMB ensemble demultiplexer 320 receives the base area service signal and demultiplexes the FIC of the base area and outputs the demultiplexer.

The base area FIC analysis unit 330 analyzes the FIC of the demultiplexed base area, extracts the restriction reception related information, and finds a sub-channel including restriction reception data such as ECM and EMM of the enhancement area based on the extracted restriction reception related information. Serve

The base region FIC analyzer 330 analyzes the FIC of the demultiplexed base region to find the scrambled base region stream and the scrambled enhancement region stream.

The AT-DMB receiving system 300 is an enhanced area FIC analyzing unit when the limited reception related information is received from the AT-DMB transmitting system 100 through the enhancement area FIC 214 without being transmitted through the basic area FIC 204. The subchannel, the scrambled base region stream, and the scrambled enhancement region stream having restricted reception data are found using (not shown). Here, the enhancement region FIC analyzer (not shown) performs a function similar to the basic region FIC analyzer 330 described above.

The limited reception message decoder 340 receives and decodes the limited reception data extracted by the base area FIC analyzer 330, finds a key value related to the descramble, and decodes the base area descrambler 350 and the enhanced area descramble. Transmit to unit 360.

The base area descrambler 350 descrambles the scrambled base area stream by using the demultiplexed base area service signal and a key value associated with descrambling.

The enhancement region descrambler 360 descrambles the scrambled enhancement region stream by using the demultiplexed enhancement region service signal and a key value associated with the descramble.

The system controller 370 controls each component of the AT-DMB receiving system 300 to perform a series of processes of the above-described limited reception broadcast service, and finally receives and transmits a descrambled stream.

The embodiments of the present invention described above are not implemented only by the apparatus and / or method, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a block diagram schematically illustrating a configuration of a conditional access system in T-DMB currently standardized and applied according to the prior art.

2 is a block diagram schematically illustrating a configuration of an AT-DMB transmission system for providing a conditional access service according to an embodiment of the present invention.

3 is a diagram illustrating the structure of a base area ETI frame and an enhancement area ETI frame in an AT-DMB transmission system according to an embodiment of the present invention.

4 is a block diagram schematically illustrating a configuration of an AT-DMB receiving system for providing a conditional access service according to an embodiment of the present invention.

Claims (8)

A limited reception message encoder which receives the limited reception subscriber data and encodes the converted reception data into the limited reception data; A base region scrambler configured to generate a scrambled base region stream using a key value for scramble received from the conditional access message encoder; An enhancement region scrambler configured to generate a scrambled enhancement region stream using a key value for scramble received from the conditional access message encoder; And A fast information channel indicating service configuration information, the scrambled enhancement region stream and the basic region stream, and the enhancement region ensemble transmission receiving the limited reception data and transmitting a basic region ensemble transmission interface frame and the limited reception data. An ensemble multiplexer constituting the interface frame, The base area ensemble transmission frame transmits limited reception related information indicating that limited reception data has been allocated to a subchannel of an enhancement area on a fast information channel of a base area. According to claim 1, The ensemble multiplexer transmits the limited reception data only to the added enhancement region without transmitting the limited reception data together with the scrambled stream. According to claim 1, The ensemble multiplexer configures the enhancement region ensemble transmission interface frame including restriction reception related information indicating that the limited reception data is allocated to a subchannel of the enhancement region in a fast information channel of the enhancement region among the enhancement region ensemble transmission interface frames. AT-DMB transmission system, characterized in that. According to claim 1, The ensemble multiplexer adds and transmits an Entitlement Control Message (ECM) of the limited received data to each scrambled channel and transmits an Entitlement Management Message (Entitlement Management Message) in which the amount of data increases according to the subscriber. AT-DMB transmission system, characterized in that the transmission on a separate sub-channel. In the AT-DMB transmission method using an AT-DMB transmission system including a conditional access message encoder, a scrambler, and an ensemble multiplexer, (a) receiving and encoding the limited reception subscriber data into the limited reception data by the limited reception message encoder; (b) the scrambler generating a scrambled base region stream and a scrambled enhancement region stream by using a key value for scramble received from the conditional access message encoder; And (c) the ensemble multiplexer receives a fast information channel indicating service configuration information, the scrambled base region stream, the scrambled enhancement region stream, and the limited reception data to receive the limited reception data into the enhancement region. Transmitting the limited reception related information indicating the allocation of the limited reception data to the high speed information channel of the basic area and transmitting the limited reception data through the sub channel dedicated to the limited reception data of the enhancement area. AT-DMB transmission method comprising a. A demodulator unit which hierarchically demodulates the terrestrial digital multimedia broadcasting signal received from a transmission system for providing a limited reception broadcast service and outputs the basic area service signal and the enhanced area service signal; An ensemble demultiplexer which receives the base area service signal or the enhancement area service signal from the demodulator and demultiplexes and outputs the high speed information channel of the base area or the high speed information channel of the enhancement area; Analyzing the fast information channel of the demultiplexed basic region, extracting the restriction reception related information, and finding a specific sub-channel having the restriction reception data of the enhancement region based on the extracted restriction reception related information; A basic region fast information channel analyzer for finding a scrambled enhancement region stream; And A conditional access message decryption unit configured to decode the conditional access data to find a key value related to descrambling, and to use the information to descramble the scrambled base region stream and the scrambled enhancement region stream. AT-DMB receiving system comprising a. The method according to claim 6, A base region descrambler configured to receive a key value related to the descramble from the limited reception message decoder and to descramble the scrambled base region stream; An enhancement region descrambler configured to receive a key value related to the descramble from the limited reception message decoder and to descramble the scrambled enhancement region stream; And A system for receiving and transmitting the descrambled base region stream and the descrambled enhancement region stream by controlling the basic region high speed information channel analyzer, the demodulator, and the ensemble demultiplexer to provide a terrestrial digital multimedia broadcasting service. Control AT-DMB receiving system further comprising. The method according to claim 6 or 7, Analyzing the fast information channel of the demultiplexed enhancement region to extract the limited reception related information, and finding a specific sub-channel with the restricted reception data of the enhancement region based on the extracted limited reception related information, and the scrambled basic Enhancement region fast information channel analyzer for finding a region stream and the scrambled enhancement region stream AT-DMB receiving system further comprising.

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