KR20120064750A - Apparatus and method for processing data in digital broadcasting system - Google Patents

Abstract

PURPOSE: Data processing apparatus and method for a digital broadcasting system are provided to enable users to change partial information on a fast information channel instead of re-multiplexing the ETI(ensemble transmission interface). CONSTITUTION: A data processing apparatus for a digital broadcasting system comprises the following: a frame separating unit(520) decoding a first ETI(ensemble transmission interface) frame, and separating FIC(first fast information channel) data and non-FIC data forming the first ETI frame; an FIC changing unit(530) changing the first FIC data into new second FIC data; and a frame formation unit(540) forming a second ETI frame based on the second FIC data and the non-FIC data.

Description

Data processing apparatus and method in a digital broadcasting system {APPARATUS AND METHOD FOR PROCESSING DATA IN DIGITAL BROADCASTING SYSTEM}

The present invention relates to wireless communications, and more particularly, to a data processing apparatus and method in a digital broadcasting system.

Terrestrial digital multimedia broadcasting (DMB) has been commercialized by adding a multimedia broadcasting service including a video service to a European Eureka 147 based digital audio broadcasting (DAB) system.

Terrestrial DMB aims to provide multimedia services including CD-quality audio and high-quality video in a mobile environment, and can provide services through up to 64 subchannels. Various services provided by a service provider are transmitted in one terrestrial DMB channel in a bundle called an ensemble. In order to compose several services into one ensemble, an ensemble multiplexer is used, which generates a signal based on an Ensemble Transport Interface (ETI) standard and outputs the signal to a coded orthogonal frequency division multiplexing (COFDM) encoder of a transmitter to broadcast terrestrial DMB. Send the. The ensemble multiplexer is the core of the terrestrial DMB transmission system and its output, ETI, is the basic interface in terrestrial DMB transmission networks.

An object of the present invention is to provide a data processing apparatus and method in a digital broadcasting system.

Another technical problem of the present invention is to provide an apparatus and method for changing a specific field in a specific FIG in a FIB of FIC data of an ETI frame.

Another technical problem of the present invention is to provide an apparatus and method for adding a desired FIG when there is an empty space in the FIB.

According to an aspect of the present invention, a data processing apparatus is provided in a digital broadcasting system. The device decodes a first Ensemble Transmission Interface (ETI) frame, and configures a first Fast Information Channel (FIC) data and a non-FIC constituting the first ETI frame. A frame separation unit for separating data, an FIC changing unit for converting the first FIC data into new second FIC data, and a frame configuration for constructing a second ETI frame based on the second FIC data and the non-FIC data Contains wealth.

According to another aspect of the present invention, a data processing method is provided in a digital broadcasting system. The method includes decoding a first ETI frame, separating first FIC data and non-FIC data constituting the first ETI frame, converting the first FIC data into new second FIC data, And constructing a second ETI frame based on the second FIC data and the non-FIC data.

According to the present invention, it is possible to minimize the change of the input ETI frame and simplify the change by changing only part of the information of the high-speed information channel (FIC) and maintaining the remaining part without remultiplexing the ETI.

1 is a diagram schematically illustrating a hierarchical structure of an ensemble transport interface (ETI) according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a structure of a frame corresponding to a LI (Logical Interface) layer of an ensemble transport interface (ETI).
3 is a view showing the structure of a transmission frame according to an embodiment of the present invention.
4 is a diagram illustrating a structure of a fast information block according to an embodiment of the present invention.
5 is a block diagram illustrating a data processing apparatus in a digital broadcasting system according to an embodiment of the present invention.
6 is a block diagram illustrating a structure of an FIC converter according to an embodiment of the present invention.
7 is a flowchart illustrating an operation of a data processing apparatus in a digital broadcasting system according to an embodiment of the present invention.

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. Also, the term "part" or the like, as described in the specification, means a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Embodiments of the present invention will now be described with reference to the accompanying drawings. Hereinafter, the 'ETI LI frame' is collectively referred to as an 'ETI frame', and the 'ETI signal' refers to a physical signal in which the 'ETI frame' is mapped to NI or NA. Since the present invention proposes a method and apparatus for handling LI data, which is a common part of all ETI interfaces, the method and apparatus proposed in the present invention can be applied to all ETI interfaces even if a signal processing and conversion process corresponding to each interface is not mentioned. Do.

1 is a diagram schematically illustrating a hierarchical structure of an ensemble transport interface (ETI) according to an embodiment of the present invention.

As shown in FIG. 1, the hierarchical structure of the ETI is defined as a logical interface (LI) layer, a network independent (NI) layer, and a network adaptation (NA) layer.

The LI layer is a basic logical structure that defines the basic information needed to create an ensemble. That is, the interface for configuring a service stream of services to be provided to the user such as audio, video or data in the field.

The NI layer is a simple physical interface layer that maps LIs and contains the basic interfaces of ETI-related devices.

The NA layer is an error-protected physical interface layer that is mapped to the LI layer for use in an error-prone network environment compared to the NI layer.

FIG. 2 is a diagram illustrating a structure of a frame corresponding to a LI (Logical Interface) layer of an ensemble transport interface (ETI).

As shown in FIG. 2, the frame corresponding to the LI layer of the ETI (hereinafter, referred to as an "ETI (LI) frame") includes a STAT (STATus) field and a LIDATA (Logical Interface DATA) field. Include. Here, the STAT field includes an ERR (ERRor status) field.

The LIDATA field includes a header field and a payload field.

The header field includes an FC (Frame Characterization) field, an STC (STream Characterization) field, and an EOH (End Of Header) field. In this case, the FC field may include an FCT (Frame CounT) field, a FICF (Fast Information Channel Flag), an NST (Number of STream) field, a FP (Frame Phase) frame, It includes a MID (Mode IDentity) field and a FL (Frame Length) field. The STC field includes a plurality of sub stream characterization (SSTC) fields each representing the characteristics of the plurality of subchannel data streams. The EOH field includes a MNSC (Muliplex Network Signaling Channel) field and a CRCh (Header CRC, Header Check) field.

In addition, the payload field includes an MST (Main STream) field, an End Of Frame (EOF) field, and a TIST (TIme STamp) field. Here, the MST field includes a fast information channel (FIC) data field and a plurality of stream subchannels Stream1 to StreamNST. The EOF field includes a CRC (Cyclic Redundancy Check) field and an Rfu (Reserved, Reserved) field.

In the STAT field, the ERR field carries information on the error status of the entire data corresponding to the ETI (LI) frame.

In the header field, the FC field carries general data characteristics that apply to frames corresponding to the entire LI layer.

In the FC field, the FCT field has a value of 0 to 249 corresponding to the number of CIFs. Here, at least one CIF is included in a main service channel (MSC) of the transport frame, and corresponds to at least one MST. FICF indicates whether the FIC data field exists in the MST. That is, information on whether there is data of an uncoded fast information channel. The NST field carries information on the number of data streams for information that can be transmitted by the STC field and the MST field. The FP field includes a transmitter identification information required for COFDM modulation. The MID field includes information for mode identification required for COFDM modulation. The FL field indicates the length of each of the STC field, the EOF field, and the MST field.

In the header field, the STC field represents information on characteristics of the plurality of subchannel data streams corresponding to the MST field, respectively. That is, the STC field includes a plurality of SSTC fields, and the plurality of SSTC fields respectively correspond to a plurality of stream subchannels of the MST field. Each of the SSTC fields includes a SCID (Sub Channel IDentification) field, a SAD (Start ADdress) field, a Protection Level (TPL) field, and a STL (Stream Length) field. . In any SSTC field, the SCID field represents information for identification indicating a stream subchannel. The SAD field indicates the start address of the stream subchannel, and the TPL field indicates information about the protection level and type of the stream subchannel. The STL field indicates the length of the stream subchannel.

The MNSE field in the EOH field indicates a signaling channel between the ETI ensemble apparatus and the transmitting apparatus. The CRCh field represents information necessary for cyclic redundancy check of the FC field, the STC field, and the MNSC field.

Next, the FIC data field in the MST field is determined according to the FICF, and represents uncoded fast information channel data. A plurality of stream subchannels are each allocated for transmitting a plurality of streams corresponding to a plurality of services, respectively.

In the EOF field, the CRC (Cyclic Redundancy Check) field indicates information necessary for the cyclic redundancy check of the MST field, and the Rfu (Reserved, Reserved) field is a reserved resource.

The TIST field indicates information required for transmission of a transmission frame corresponding to the corresponding ETI (LI) frame.

3 is a view showing the structure of a transmission frame according to an embodiment of the present invention.

As shown in FIG. 3, the transmission frame includes a synchronization channel (SC, shown as "SC" in FIG. 3), and a fast information channel (FIC, shown as "FIC" in FIG. 3). And a Main Service Channel (MSC, shown as "MSC" in FIG. 3).

The synchronization channel SC is a channel for transmitting information for demodulation on digital communication, and has a predetermined form to indicate synchronization of a transmission frame.

The fast information channel (FIC) represents information on each of a plurality of subchannels corresponding to the main service channel (MSC), and one or more fast information blocks (FIBs, shown as “FIBs” in FIG. 3). It includes.

The main service channel (MSC) is a channel for delivering an actual data stream such as an audio service, a data service, or a video service. At least one Common Interleaved Frame (CIF) is illustrated as "CIF" in FIG. 3. It includes. Here, one CIF corresponds to one MST, and data allocated to the CIF is FEC coded for data protection. That is, in the MST, a plurality of streams respectively corresponding to the plurality of stream subchannels are each FEC coded and allocated to the plurality of subchannels of the main service channel, respectively.

On the other hand, the configuration or length of the transmission frame is determined according to the transmission mode of the transmission frame.

Table 1 shows a structure of a transmission frame according to a transmission mode.

Transmission mode Frame length FIB per transmission frame CIF per frame I 96 ms 12 4 II 24 ms 3 One III 24 ms 4 One IV 48 ms 6 2

As shown in Table 1, the transmission mode (I) is a transmission mode for digital broadcasting with a single frequency network, the fast information channel (FIC) includes 12 FIBs, and the main service channel (MSC) is 4 CIFs. Including, the total length of the transmission frame is 96ms. The transmission mode (II) is a transmission mode for digital broadcasting with a multi-frequency network. The fast information channel (FIC) includes three FIBs, and the main service channel (MSC) includes one CIF. The length is 24ms. The transmission mode (III) is a transmission mode for digital broadcasting with a cable network. The fast information channel (FIC) includes four FIBs, and the main service channel (MSC) includes one CIF. The length is 24ms. Finally, the transmission mode (IV) is a transmission mode for digital broadcasting with a terrestrial / satellite mixed network. The fast information channel (FIC) includes six FIBs, and the main service channel (MSC) includes two CIFs. The total length of the transmission frame is 48ms.

Next, the high speed information channel (FIC) of the transmission frame will be described. As shown in FIG. 3, the fast information channel (FIC) includes at least one fast information block (FIB) according to a transmission mode.

4 is a diagram illustrating a structure of a fast information block according to an embodiment of the present invention.

As shown in FIG. 4, the fast information block (FIB) includes a 30-byte FIB data field (shown as a "FIB data field" in FIG. 4) and a 2-byte cyclic redundancy check (CRC). ) Field.

The FIB data field includes a plurality of fast information groups (referred to as "FIG" in FIG. 4 and referred to as "FIG" in the following), and an end marker ("End marker" in FIG. 4). ) Field and padding (shown as "padding" in FIG. 4) field. FIG is a unit for loading information, the end marker field includes end information of FIG, and the padding field is a spare area for matching a fixed length (30 bytes) of the FIB data field.

As shown in FIG. 4, FIG is shown as a header (shown as "FIG header" in FIG. 4, hereinafter referred to as "FIG header") and a data field ("FIG data field" in FIG. 4). "FIG data field"). The length of FIG is variable, but may not exceed 30 bytes including the FIG header, and one FIG cannot be transmitted in two or more FIBs.

The FIG header includes a FIG type field (shown as "FIG type" in FIG. 4) and a length field (shown as "Length" in FIG. 4). The FIG type field carries type information for indicating the characteristic of the information transmitted by the FIG data field using 3 bits, and the length field indicates the length of the FIG data field using 5 bits.

The FIG data field includes actual data to be transmitted through FIG. Table 2 is a table exemplarily showing information configured in the FIG type field according to the type of information included in the FIG data field.

FIG type FIG Application 0 MCI and part of the SI One Labels, etc (part of the SI) 2 Labels, etc (part of te SI) 3 Reserved 4 Reserved 5 FIC Data Channel (FIDC) 6 Conditional Access (CA) 7 In house (except for Length 31)

As shown in Table 2, FIG. 0 of Type 0 includes multiplex configuration information (also referred to as MCI, or " multiplexing information "), and basic service information such as time and date. In FIG. 1, FIG. 1 type delivers service information (SI) including a label for display and other information for defining a label. FIG. 5 of Type 5 carries a Fast Information Data Channel (FIDC). FIG. 6 FIG. Shows information corresponding to control and management of components of an emergency service. Pass Conditional Access (CA). FIG. 7 of the type 7 is for extending the length field when the length of the FIG data field exceeds 31. FIG. In addition, FIG. 2 of type 2, FIG. 3 of type 3, and FIG. 4 of type 4 are reserved types that are not currently used, and may be newly defined according to future needs.

In some situations, it may be necessary to convert only some information in the FIC, such as a label or ID, in a digital broadcast provided through the ETI. In this case, if the remultiplexing technique is used, both service configuration and subchannels must be changed. However, this is inefficient because it must regenerate up to the portion of data that does not need to be changed. Thus, there is a need for an apparatus and technique for selectively converting only some information in an FIC.

5 is a block diagram illustrating a data processing apparatus in a digital broadcasting system according to an embodiment of the present invention. This is a data processing apparatus that converts only a specific field of FIG in the FIC, such as a label for service indication or a service ID.

Referring to FIG. 5, the data processing apparatus 500 includes an ETI signal input unit 510, a frame separator 520, an FIC converter 530, a frame configuration unit 540, and an ETI signal output unit 550. do.

The ETI signal input unit 510 processes the input first ETI signal of the NI or NA layer and outputs the first ETI frame to the frame separator 520.

The frame separator 520 checks a cyclic redundancy check (CRC) of the header and payload extracted by decoding the first ETI frame, and separates the first FIC data and the non-FIC data constituting the first ETI frame. . The first FIC data is transmitted to the FIC converter 530, and the non-FIC data is transmitted to the frame component 540, respectively. Here, non-FIC data means the remaining data portion except for the first FIC data.

The FIC converter 530 converts the first FIC data into the second FIC data based on the FIC conversion setting given in the system. As an example, the FIC converter 530 subdivides the first FIC data into a fast information block (FIB) and a fast information group (FIG), converts a value of a field of FIG which needs to be converted among the plurality of FIGs, The second FIC data is output. As another example, when there is a blank space in the first FIC data, the FIC converter 530 further inserts a desired FIG while outputting the second FIC data while maintaining another FIG.

The frame configuration unit 540 configures a new second ETI frame including the second FIC data and the non-FIC data. When comparing the first ETI frame and the second ETI frame, the non-FIC data is the same, but there is a difference in the FIC data and the CRC. This is because only the FIC data and the CRC are replaced by the FIC converter 530 in the first ETI frame.

The ETI signal output unit 550 outputs the second ETI frame as an ETI signal of an NI or NA layer according to a setting.

According to the data processing apparatus 500 as described above, by changing only part of the information of the high-speed information channel (FIC) and maintaining the rest without remultiplexing the ETI, the change of the input ETI frame is minimized and the change is simplified. have. The detailed structure of the FIC converter 530 is described in FIG.

6 is a block diagram illustrating a structure of an FIC converter according to an embodiment of the present invention.

Referring to FIG. 6, the FIC converter 600 includes an FIC decoder 610, a FIG converter 620, and an FIC encoder 630.

The FIC decoder 610 again includes a buffer 611 and an FIB decoder 612.

The buffer 611 configures at least one FIB by buffering input first FIC data.

The FIB decoder 612 checks the CRC of at least one FIB input and transmits an FIB valid data field including a plurality of FIGs to the FIG converter 620.

The FIG conversion unit 620 again includes the FIG correction and insertion unit 621 and the conversion control unit 622.

The FIG modification and insertion unit 621 detects the type of FIG that needs to be converted in the FIB valid data field, checks the value of the predetermined field and the predetermined field of the corresponding FIG, and then adjusts the value of the predetermined field according to the conversion setting given by the system. Convert. Alternatively, the FIG modification and inserting unit 621 inserts FIG set according to a conversion setting given by the system when there is empty space equal to the size of FIG to be inserted into the FIB valid data field at every predetermined insertion period. In this case, however, FIG is inserted into the FIB valid data field only when it can be inserted.

The conversion control unit 622 determines a predetermined type / extension FIG to be detected according to a given FIC conversion setting in the system, and transmits a field and a change value to be changed in the FIG to the FIG modification and insertion unit 621. Alternatively, the conversion control unit 622 configures FIG to be added according to a given FIC conversion setting in the system, and transfers the corresponding FIG to the FIG modification and insertion unit 621.

The FIC encoder 630 again includes an FIB encoder 631 and a buffer 632.

The FIB encoder 631 configures the FIB valid data field to meet the standard, calculates a CRC, and the buffer 632 buffers a 32-byte FIB to output the converted second FIC data.

7 is a flowchart illustrating an operation of a data processing apparatus in a digital broadcasting system according to an embodiment of the present invention.

Referring to FIG. 7, the data processing apparatus decodes a first ETI frame by processing a first ETI signal of an input NI or NA layer (S700). Specifically, this step examines the CRC of the header and payload extracted by decoding the first ETI frame.

The data processing apparatus separates the first FIC data and the non-FIC data constituting the first ETI frame (S710). Here, non-FIC data means the remaining data portion except for the first FIC data.

The data processing device converts the first FIC data into second FIC data based on the FIC conversion settings given in the system. As an example, the data processing apparatus subdivides the first FIC data into a fast information block (FIB) and a fast information group (FIG), converts a value of a field of FIG which needs to be converted among the plurality of FIGs, and then converts the new second FIC into a new second FIC. Output the data. As another example, when there is a space in the first FIC data, the data processing apparatus further inserts a desired FIG while outputting the second FIC data while maintaining the other FIG.

The data processing device constructs a new second ETI frame including the second FIC data and the non-FIC data. When comparing the first ETI frame and the second ETI frame, the non-FIC data is the same, but there is a difference in the FIC data and the CRC. This is because only the FIC data and the CRC are replaced in the first ETI frame.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (10)

In the data processing apparatus in a digital broadcasting system,
Decode a first ensemble transmission interface (ETI) frame and separate first fast information channel (FIC) data and non-FIC data constituting the first ETI frame. A frame separator;
An FIC changer for converting the first FIC data into new second FIC data; And
And a frame constructing unit configured to construct a second ETI frame based on the second FIC data and the non-FIC data. The method of claim 1,
And an ETI output interface processor configured to generate the second ETI frame in a transmission frame of a network interface layer or a network adaptation layer level. The method of claim 1,
The FIC converter,
FIB valid data buffering the first FIC data to form a fast information block (FIB), and decoding the FIB to include a plurality of fast information groups (FIGs). An FIC decoder for extracting a field;
A FIG converter configured to determine a FIG. And
And a FIC encoder for generating second FIC data including the converted FIG. The method of claim 3, wherein
And wherein the predetermined type of FIG is a type 1 FIG and the predetermined field is a label for display and another information field for defining a label. The method of claim 1,
The FIC converter,
A FIC decoder configured to buffer the first FIC data to configure an FIB, and to decode the FIB to extract an FIB valid data field including a plurality of FIGs;
A FIG converting unit for monitoring the free space of the FIB valid data field at a predetermined insertion period, and inserting a new FIG. And
And an FIC encoder for generating second FIC data based on the FIB valid data field including the new FIG. In the data processing method in a digital broadcasting system,
Decoding the first ETI frame;
Separating first FIC data and non-FIC data constituting the first ETI frame;
Converting the first FIC data into new second FIC data; And
And constructing a second ETI frame based on the second FIC data and the non-FIC data. The method according to claim 6,
Generating a transmission frame of a network interface layer or a network adaptation layer level from the second ETI frame. The method according to claim 6,
Buffering the first FIC data to configure an FIB;
Decoding the FIB to extract an FIB valid data field including a plurality of FIGs;
Determining a predetermined type of FIG from which the conversion is needed among the plurality of FIGs;
Converting a predetermined field in the determined predetermined type of FIG and a value of the predetermined field; And
Generating second FIC data including the modified FIG. The method of claim 8,
The predetermined type of FIG is type 1 FIG, and the predetermined field is a label for display and another information field for defining a label. The method according to claim 6,
Buffering the first FIC data to configure an FIB;
Decoding the FIB to extract an FIB valid data field including a plurality of FIGs;
Monitoring the free space of the FIB valid data field at a predetermined insertion period, and inserting a predetermined new FIG into the FIB valid data field if insertable; And
Generating second FIC data based on the FIB valid data field comprising the new FIG.

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