KR100831357B1 - Method for transmitting and receiving Digital Multimedia Broadcasting data - Google Patents

Abstract

Disclosed are a transmission method of a digital multimedia broadcasting transmitter and a reception method of a receiver. According to the present invention, a method for transmitting a digital multimedia broadcasting transmitter for transmitting a signal consisting of a DMB transmission frame including a synchronization channel, a fast information channel (FIC), and a main service channel (MSC) includes a main service channel (MSC) of a DMB transmission frame. Constructing a fast information channel (FIC) including information on the number of subchannels included in the < 0 > And transmitting a signal consisting of a DMB transport frame including a configured high speed information channel (FIC). According to the present invention, an accurate decoding parameter can be extracted by specifying the number of subchannels in a fast information channel (FIC) in a DMB transmission frame.

Multimedia, Broadcast, DMB, Transmit, Subchannel, Data

Description

Method for transmitting and receiving digital multimedia broadcasting {Method for transmitting and receiving Digital Multimedia Broadcasting data}

1 is a diagram showing the structure of a conventional DAB / DMB service;

2 is a diagram illustrating a structure of a DAB / DMB transmission frame provided by a conventional DAB / DMB service;

3 is a diagram illustrating a structure of a fast information channel (FIC) in a typical DAB / DMB transmission frame;

4 is a diagram showing a field structure of FIG 0/1 of a fast information channel (FIC) in a typical transmission frame;

5 is a diagram illustrating a FIG frame structure of a fast information channel (FIC) in a transport frame according to an embodiment of the present invention;

6 is a block diagram illustrating a schematic configuration of a transmitter for providing a DAB / DMB service according to an embodiment of the present invention;

7 is a flowchart illustrating a receiving method of a digital multimedia broadcasting receiver according to an embodiment of the present invention.

The present invention relates to a method for transmitting a digital multimedia broadcasting transmitter and a method for receiving a receiver. More specifically, the number of subchannels is specified in a fast information channel (FIC) in a DMB transmission frame to extract an accurate decoding parameter. The present invention relates to a method for transmitting a digital multimedia broadcasting transmitter and a method for receiving a receiver.

Recently, as digital audio equipment with excellent sound quality such as CD and DVD has been widely spread and popularized, the demand of listeners for digital broadcasts requiring high quality sound is increasing day by day, and thus the limitation of sound quality that existing FM broadcast can provide To overcome, Digital Audio Broadcasting (DAB) is being implemented in Europe, Canada and the United States. DAB system uses technology that is completely different from current AM and FM broadcasts to show not only high quality sound quality but also excellent reception on the go, and it can transmit digital data such as video and text at high speed. . Recently, various multimedia services including video rather than audio broadcasting are emphasized and referred to as digital multimedia broadcasting (DMB). In other words, DMB is a digital multimedia broadcasting that can provide CD-level sound quality and data or video service, and provide excellent fixed and mobile reception quality.

The European Eureka-147 system was created for digital audio broadcasting (DAB), but it is also used as the ground-based technology for terrestrial DMB that uses a narrow frequency bandwidth of 2 MHz to serve video of small screen size.

In the Eureka-147 scheme, one broadcast service may be configured as a plurality of service components, and multiple broadcasts may be multiplexed and transmitted through the about 2 MHz frequency band.

1 is a diagram illustrating a structure of a typical DAB / DMB service.

Referring to FIG. 1, an ensemble structure of DAB / DMB services transmits a plurality of services. Thus, multiple service connections are possible within one ensemble, and each service consists of one or more service components.

The DMB service is composed of one or more service components, and one or more services constitute one ensemble. The ensemble of FIG. 1 consists of three or more services, each of which again consists of 2-3 service components.

In FIG. 1, the first service (service label 'ALPHA 1 RADIO') is used for the Traffic Message Channel (ALPHA-TMC) and Service Information (ALPHA-SI) in addition to one main audio component. It consists of two sub service components. The second service (BETA RADIO) consists of two service components, including the main and secondary audio components. The third service (ALPHA 2 RADIO) shares the service components of ALPHA 1 RADIO, ALPHA-TMC and ALPHA-SI. Depending on the switch's location, it also shares the 'ALPHA 1 RADIO' audio service component.

The ensemble structure of such a service includes a fast information channel (FIC) consisting of a fast information block (FIB) including service-related information and a fast information group (FIG) below it, and an actual audio service. It consists of a main service channel (MSC) consisting of a bundle of.

The service component refers to video, audio, traffic information, or broadcast service information constituting a broadcast. In a DAB / DMB system, a plurality of services are multiplexed and transmitted, and a service component of each service is each subchannel and a fast information channel (FIC) of a main service channel (MSC).

 A service corresponds to a broadcast, and one service is composed of one or more service components. What can come as a service component is each subchannel of the primary service channel (MSC) and the fast information data channel (FIDC).

In the Eureka-147 method, multiplex configuration information (MCI) is configured as information indicating a service multiplexed in an ensemble, a service component constituting each service, and a service component. That is, the Euraka-147 transmits data through repetitive transmission of a unit structure called a frame, and the transmission frame includes a synchronization channel (SC), a fast information channel (FIC), and a main service channel (Main Service). Channel: MSC).

2 is a diagram illustrating a structure of a DAB / DMB transmission frame provided by a general DAB / DMB service.

As shown in FIG. 2, a synchronization channel may be used in a transmission system such as transmission frame synchronization, automatic frequency control, channel state estimation, and transmitter identification. Used for the demodulator function, a null symbol and a phase reference symbol (PRS) for QPSK modulation and demodulation are assigned.

The high speed information channel (FIC) is used to transmit data that needs to transmit information at high speed, and in particular, transmits multiplex information (Main Configuration Information (MCI)) and service information (SI) data services. The primary service channel (MSC) is composed of one or more Common Interleaved Frames (CIFs), and is used to transmit service components such as video, audio, and data.

The high speed information channel (FIC) contains information indicating the structure of data carried in the CIF in the main service channel (MSC), and each CIF contains actual data such as video data and audio data. Depending on the transmission mode, the number of FIBs loaded on the fast information channel (FIC) and the number of CIFs loaded on the main service channel (MSC) are different. For example, in the transmission mode I, the fast information channel (FIC) is composed of 12 FIBs, and the main service channel (MSC) is composed of 4 CIFs.

3 is a diagram illustrating a structure of a fast information channel (FIC) in a typical DAB / DMB transmission frame.

In the transmission mode I, 12 FIBs constitute one high-speed information channel (FIC). The FIB is divided into a 30-byte data field and a 2-byte CRC part. The FIB data field is composed of a plurality of FIG fields, end markers, and padding, and each FIG field includes a header portion and a data field indicating the type and length of FIG. Have On the other hand, there are 8 types of FIG from 000 to 111, and Table 1 below shows a diagram of such FIG type.

FIG type number FIG type FIG application 0 000 MCI and part of the SI One 001 Labels, etc (part of the SI) 2 010 Labels, etc (part of the SI) 3 011 Reserved 4 100 Reserved 5 101 FIC Data Channel (FIDC) 6 110 Conditional Access (CA) 7 111 Reserved (except for Length 31)

In order to decode a subchannel in a primary service channel (MSC), information included in a fast information channel (FIC) is used. This includes multiplex configuration information (MCI) and service information (SI) which are configuration information of a main service channel (MSC). The multiplex configuration information includes subchannel structure and service structure, ensemble information, and multiplex reconfiguration information. In addition, the service information includes various information such as service component language, time and country identifier.

4 is a diagram illustrating a field structure of FIG 0/1 of a fast information channel (FIC) in a normal transmission frame.

Information directly needed for subchannel decoding of the primary service channel (MSC) is included in the multiplex configuration information of FIG. Specifically, FIG 0/0 (FIG Type 0 Expansion 0), FIG 0/1 (Type 0, Expansion 1), FIG 0/2 (Type 0, Expansion 2), FIG 0/3 (Type 0, Expansion 3) Analyze and collect the information needed for decoding. Key information about the subchannels is presented in FIG 0/1.

Information needed to decode the primary service channel (MSC) can be obtained by collecting FIG information. Referring to FIG. 2, one transport frame includes a service channel, a fast information channel (FIC), and a main service channel (MSC). One ensemble consists of several subchannels in transmission. Exactly how many subchannels are configured is not specified in the multiplexing configuration information. Therefore, the DMB receiving side extracts a decoding parameter by analyzing based on FIG information obtained after confirming a specific repeating pattern several times.

Like the conventional FIG 0/1 field structure of FIG. 4, FIG includes various types of information according to its type, for example, FIG. Of FIG. 0 may not appear in a repeated form. And although FIG type 0 is repeated, the extension 1 field may be repeated to not provide all the information about the subchannel. So, in general, after checking a specific pattern that is repeated a certain number of times or starting parsing of a fast information channel (FIC), decoding parameters are extracted based on FIG information obtained after a certain time has elapsed. However, this method is not only inefficient in obtaining the necessary information, but also inefficient because the time required for obtaining the information can be unnecessarily long.

Accordingly, an object of the present invention is to provide a digital multimedia broadcasting transmission method and a digital multimedia broadcasting reception method capable of extracting an accurate decoding parameter by specifying the number of subchannels in a fast information channel (FIC) in a DMB transmission frame.

A transmission method according to an embodiment of the present invention for achieving the above object, a digital multimedia broadcasting transmitter for transmitting a signal consisting of a DMB transmission frame consisting of a synchronization channel, a fast information channel (FIC) and a main service channel (MSC) CLAIMS 1. A method of transmitting a data, comprising: configuring a fast information channel (FIC) including information on the number of subchannels included in a main service channel (MSC) of the DMB transmission frame; And transmitting a signal consisting of a DMB transmission frame including the configured fast information channel (FIC).

Preferably, the information on the number of subchannels is included in the FIG data field included in the fast information channel (FIC).

The information on the number of the subchannels may be included in any one of the extension of the FIG data field.

A receiving method of a digital multimedia broadcasting receiver for receiving a signal consisting of a DMB transmission frame including a synchronization channel, a fast information channel (FIC), and a primary service channel (MSC) according to the present invention is included in the primary service channel (MSC). Receiving a DMB signal including a fast information channel (FIC) including information on the number of subchannels that have been processed; Obtaining the information on the number of subchannels from the fast information channel (FIC); And extracting decoding information including the number information of the obtained subchannels.

Preferably, the information on the number of subchannels may be included in any one of an extension of the FIG data field included in the fast information channel (FIC).

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

FIG. 5 is a diagram illustrating a FIG frame structure of a fast information channel (FIC) in a transport frame according to an embodiment of the present invention.

As described above, a fast information channel (FIC) is a transmission side that provides a DMB service, and the receiver is required to transmit or quickly transmit information necessary for processing data, for example, information on a service configuration, an encoding type, and the like. This is the channel used to transmit the necessary data. The fast information channel (FIC) includes multiplexing configuration information including information on the structure of each subchannel, and service information that is additional information about each service. Accordingly, it is possible to determine which service data is transmitted through the main service channel (MSC) of the fast information channel (FIC), and which service is used in the receiver by which application.

The fast information channel (FIC) is composed of FIBs, and each FIB is composed of an FIB data field and a CRC data field. The FIB data field is again composed of the FIG field, end maker and padding. FIG. 5 shows a structure of FIG. 0 in the FIG data field. FIG type 0 in the FIG data field contains basic service information necessary for current or subsequent multiplex configuration of signals and other subchannel decoding.

In the present invention, for example, an extension indicating the number of subchannels is added to an unused portion of extensions 0 to 31 (when 5 bits) of FIG type 0. In addition, since the maximum number of subchannels constituting one ensemble is 64, a FIG extension field indicating this is enough 1 byte.

FIG types may be classified into eight types according to multiplex configuration information, service information, conditional access (CA), and FICC (FIC data channel). Among them, information directly necessary for subchannel decoding of the main service channel (MSC) is included in multiplex channel information of FIG type 0, and types 3, 4, and 7 are reserved intervals. Type 0, on the other hand, has an extension of 32 (5 bits). Specifically, FIG 0/0 (FIG type 0 extension 0), FIG 0/1, FIG 0/2 and FIG 0/3 are analyzed to collect information necessary for decoding. Adding an extension indicating the number of subchannels to this, since the number of subchannels is already known, the FIC analysis acquires a field in which the number of subchannels is recorded in the decoding process and fills as much information as the number of recorded subchannels. You can do parsing.

6 is a block diagram illustrating a schematic configuration of a transmitter for providing DAB / DMB service according to an embodiment of the present invention.

The transmitter includes a fast information processor 610, a service information processor 620, an audio processor 630, a data processor 640, a video processor 650, a main service multiplexer 660, and a transmission frame. A multiplexer 670, an OFDM modulator 680, and an RF unit 690 are included.

The audio processor 630 receives audio service data such as voice and music to be broadcast, encodes and channel-codes it, and transmits the encoded data to the main service multiplexer 660. Data such as text information, web degree, etc. except audio are classified into packet mode data and input to the data processing unit 640.

The data processor 640 encodes the input packet mode data and transmits the encoded packet mode data to the main service multiplexer 660.

The high speed information processing unit 610 receives the data service of the high speed information channel (FIC) to configure the FIDC, and generates the multiplexed configuration information (MCI) using the multiple control data. In addition, the FIB is generated using the service information (SI), the FIDC, and the MCI generated by the service information processor 620. In the present invention, information on the number of subchannels is added to the data field of FIG constituting the FIB.

The service information processor 620 processes service information including additional information about a program and a data service.

The video processor 650 may be classified into video signals such as movies and drama videos, and additional data (eg, subtitle data) related thereto, or packet mode data such as text information, traffic information, still images, and web information. The video service data including the encoding is encoded and transmitted through the channel coding to the main service multiplexer 660.

The main service multiplexer 660 multiplexes an audio service, a data service, and a video service.

The transport frame multiplexer 670 combines the data transmitted on the high-speed information channel (FIC) and the data multiplexed by the main service multiplexer 660, inserts synchronization information therein, and generates and outputs a transport frame. The generated transmission frame is transmitted to the receiver through the OFDM modulator 680 and the RF unit 690.

7 is a flowchart illustrating a receiving method of a digital multimedia broadcasting receiver according to an embodiment of the present invention.

In this embodiment, it is assumed that information on the number of subchannels is included in FIG type 0 / extension1.

The receiver receives a DMB signal including a fast information channel (FIC) including information on the number of subchannels included in the main service channel (MSC) of the DMB transmission frame (S710). The receiver obtains information on the number of subchannels from FIG type 0 / expansion 1 of the fast information channel FIC (S720). The receiver extracts decoding information about a subchannel including information about the number of analyzed subchannels (S730).

For example, assuming that the number of subchannels acquired from FIG type 0 / extension1 is 4, the receiver repeats when it is confirmed that the subchannels included in the main service channel (MSC) are four channels of different types. It is possible to extract decoding information on the received subchannel without checking a specific pattern.

As described above, according to the present invention, the number of sub-channels can be specified in the fast information channel (FIC) in the DMB transmission frame to extract an accurate decoding parameter and shorten the information analysis time of the fast information channel (FIC). You can.

In addition, the present invention is not limited to the preferred embodiments of the present invention, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. These modified implementations should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (5)

A transmission method of a digital multimedia broadcasting transmitter for transmitting a signal consisting of a DMB transmission frame composed of a synchronization channel, a fast information channel (FIC), and a main service channel (MSC), Configuring a fast information channel (FIC) including information on the number of subchannels included in a main service channel (MSC) of the DMB transmission frame; And And transmitting a signal consisting of a DMB transmission frame including the configured high speed information channel (FIC). The method of claim 1, The information about the number of subchannels is included in the FIG data field included in the fast information channel (FIC). The method of claim 2, The information on the number of the sub-channels is included in any one of the extension (extension) of the FIG data field. A reception method of a digital multimedia broadcasting receiver for receiving a signal consisting of a DMB transmission frame including a synchronization channel, a fast information channel (FIC), and a main service channel (MSC) Receiving a DMB signal including a fast information channel (FIC) including information on the number of subchannels included in the main service channel (MSC); Obtaining information about the number of subchannels from the fast information channel (FIC); And And extracting decoding information including information about the number of the acquired subchannels. The method of claim 4, wherein The information on the number of subchannels is included in any one of an extension of the FIG data field included in the fast information channel (FIC).

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