KR20070039183A - Method for transmitting epg in digital multimedia broadcasting system - Google Patents

Abstract

The present invention relates to a method of transmitting information in a digital multimedia broadcasting system, and assigns a separate FIG type in an MSC data group field of subchannel 63 in which additional SI information is recorded in the MSC. The EPG information is inserted for the FIG type, and the additional SI information is transmitted by adding a length extension field to the FIC data frame structure. According to the present invention, since EPG information can be obtained only by referring to a specific table of FIG, without having to search for several tables of the FIC and perform a channel search in order to obtain EPG information in the DMB system, it is easy to acquire information, It can provide a better service environment.

EPG, Subchannel, MSC, FIC, FIG

Description

APP information transmission method in digital multimedia broadcasting system {METHOD FOR TRANSMITTING EPG IN DIGITAL MULTIMEDIA BROADCASTING SYSTEM}

1 is a schematic block diagram of a terrestrial digital multimedia broadcasting system used in the present invention;

2 is a diagram illustrating a digital multimedia broadcasting multiplex frame structure for transmitting EPG information according to the present invention;

3 is a diagram illustrating a data field structure for explaining a method of transmitting EPG information in a digital multimedia broadcasting system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: VHF antenna 102: terrestrial DMB tuner

104: baseband processor 106: demultiplexer

108: multimedia processing unit 110: DAC

200: subchannel 63

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital multimedia broadcasting (DMB), and more particularly, to a method for transmitting EPG information in a DMB system suitable for quickly obtaining EPG (Electronic Program Guide) information in a terrestrial DMB system. .

The DMB refers to a service that has been renamed and used domestically in accordance with the ITU regulations that digital audio broadcasting (DAB) hereinafter includes video, text, etc. in addition to audio.

The DMB is an advanced system that not only provides users with completely digital information but also applies various frequencies in terms of quality and quantity. In addition, DMB can transmit voice programs and data programs at different data rates at the same time, and provides PAD (Program Associated Data) services that include data services in voice programs, and independently of text, graphics, and video. Non Program Associated Data (NPAD) services that provide programs are available. In particular, the NPAD service may be used to provide contents such as train and plane timetables, stock information, weather information, performance information, and news.

Such DMB receivers include PC (PC) card type, home audio type, and automobile type. The DMB receivers are classified into terrestrial broadcasting service and satellite broadcasting service according to the characteristics of the medium.

Broadcasting using satellite is to transmit video and audio signal produced by broadcasting station through transmitting earth station and send signal to remote receiving earth station by using satellite, which is a stationary satellite floating over the equator, as a repeater. A signal is transmitted from the terrestrial digital broadcasting earth station to the satellite, and the signal received from the satellite is downstream through the L-band.

In addition, in a broadcast system using terrestrial waves, a digital broadcasting station directly outputs a digital broadcast. Broadcast signals output by these two methods are received by mobile and fixed digital receivers.

Such a DMB system can be broadly classified into an out-of-band (EUREKA) -147 method jointly proposed in Pan-Europe and an in-band (IN-BAND) method proposed by the United States.

The dual Eureka-147 method uses a new frequency band other than the FM band in which analog broadcasting is provided, and features the use of the new frequency band and broadband transmission. In addition, the Eureka-147 system has a frequency band of 30 MHz to 3 GHz, that is, Very High Frequency (VHF), Ultra High Frequency (UHF), and L-band (1 to 2 GHz) / S-band; It can operate in the 2 ~ 4GHz) band (satellite broadcasting band), it is possible to broadcast terrestrial broadcasting through the current FM band and TV band and satellite broadcasting through the L / S band. Therefore, it is known to be the best DAB system developed to date because the frequency can be efficiently used through improved reception performance, high speed data transmission and single frequency network configuration due to broadband transmission.

In-band method is a method of sharing the frequency band used by the conventional analog broadcasting, and the IBOC (In-Band On-Channel) method for transmitting digital audio signal to AM or FM channel and the adjacent channel of FM channel. IBAC (In-Band Adjacent-Channel) method is proposed.

As described above, since the DMB system has a multiplexed frame structure, there is an advantage in that multiple broadcasts (services) can be carried on one frequency channel.

Meanwhile, even in the above-described DMB system, as the number of channels increases, there exists an EPG function that allows a user to easily search for a desired broadcast program as in a conventional digital TV.

Currently, the DMB transmission standard specifies that EPG information can be sent in an XML (eXtensible Markup Language) structure instead of a fixed bit string structure such as PSIP (Program and System Information Protocol) to have a systematic and flexible information structure. In addition, when transmitting EPG information, it is specified to transmit a binary file having an XML structure and a one-to-one matching structure through a moving image transfer protocol, that is, a motion object transfer (MOT) protocol.

In this case, the transport channel uses a PAD channel or an independent packet data channel in an audio frame. In order to obtain EPG information in a DMB system, several tables of fast information channels (FIC) are found in the DMB multiplexed frame structure and the corresponding channel is used. The disadvantage is that you have to search for.

As a result, unnecessary time is consumed in providing the EPG information to the user in the DMB system, and as a result, the system load is increased, resulting in a problem that the user cannot provide a good service.

The present invention is to solve the above-described problems of the prior art, a separate FIC type through a sub-channel 63 (AIC channel) of the MSC (Main Service Channel) containing the additional service information (SI) information The purpose of the present invention is to provide a method for transmitting EPG information in a DMB system capable of acquiring EPG information without analyzing multiple FIC tables by assigning EPG information.

According to a preferred embodiment of the present invention for achieving the above object, an information transmission method in a digital multimedia broadcasting system for transmitting a frame having a data frame structure including an FIC and an MSC, the additional SI information in the MSC is recorded; Allocating a separate FIG type in an MSC data group field of a subchannel, inserting EPG information for the allocated FIG type, and adding a length extension field to the FIC data frame structure to add the additional SI information. It provides a method for transmitting information in a digital multimedia broadcasting system comprising the step of transmitting.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

First, FIG. 1 is a schematic block diagram of a terrestrial DMB system used in the present invention.

As shown in FIG. 1, the terrestrial DMB system includes a VHF antenna 100, a terrestrial DMB tuner 102, a baseband processor 104, a demultiplexer 106, a multimedia processor 108, and a DAC (Digital). Analog Converter 110).

The terrestrial DMB tuner unit 102 is a transmission / reception high frequency circuit unit, and serves to tune the terrestrial DMB broadcasting signal provided through the VHF antenna 100, that is, the VHF signal back to the original frequency and to a channel having a desired frequency band. In addition, the terrestrial DMB tuner 102 suppresses amplification of noise included in the received signal as much as possible and amplifies only a desired signal. That is, the PA plays a role of a power amplifier (PA) when transmitting a signal and a low noise amplifier (LNA) when receiving a signal.

The baseband processor 104 is a means for accurately reproducing the high frequency signal of the terrestrial DMB tuner 102, and then the high frequency signal passed through the baseband processor 104 is converted into a predetermined intermediate frequency IF.

The baseband processor 104 includes a masking pattern adapted universal subband integrated coding and multiplexing (MUSICAM) decoder 104a. The MUSICAM decoder 104a is a means for separately decoding an audio signal of the MUSICAM standard. The MUSICAM decoder 104a uses an MPEG-1 / 2 layer 2 compression scheme and transmits the audio signal in a stream mode.

The demultiplexer 106 demultiplexes the video signal and the decoded audio signal from the baseband processor 104 into the original signal, and provides the demultiplexer 106 to the multimedia processor 108 described below.

The multimedia processing unit 108 decodes and processes the video signal and the audio signal provided from the demultiplexing unit 106 so as to divide the image and the audio and output the same.

The multimedia processing unit 108 includes an H.264 video decoder 108a, a BSAC audio decoder 108b, and an MPEG-4 BIFS data processing unit 108c, respectively.

The H.264 video decoder 108a decodes a video signal based on H.264, which is the latest standard for video service in a wired / wireless network environment, and the bit sliced arithmetic coding (BSAC) audio decoder 108b is a BSAC. Decodes the audio signal according to the standard. The MPEG-4 BIFS (Binary Format for Scenes) data processing unit 108c is a compression standard of the DMB broadcasting service. The MPEG-4 BIFS (Binary Format for Scenes) data processing unit 108c can display a plurality of scenes on a screen because various scenes are indicated for data broadcasting.

The digital analog converter (DAC) 110 converts an audio signal processed by the multimedia processing unit 108 into an analog signal and outputs a voice.

2 is a diagram illustrating a structure of a DMB multiplexed frame for transmitting EPG information according to the present invention. As shown in FIG. 2, the DMB multiplexed structure applied to the present invention has an ensemble as a top structure. , Service components, and the provided content is physically carried on a plurality of sub-channels of the MSC.

The frame structure of DMB provides a service by transmitting a frame composed of FIC and MSC.

The FIC is composed of a plurality of fast information blocks (FIBs). The FIC delivers multiple configuration information and information for correctly decoding each service information, and the MSC transmits multiplexed audio frames and data packets. Include.

The FIIC consists of multiplex configuration information (MCI), SI, and fast information data channel (FIDC), and the MCI is used to interpret the MSC including information such as service type, location, and type. The SI includes a service title and channel information, and the FIDC provides an urgent data service such as a traffic message channel (TMC) and an emergency warning system (EWS).

Meanwhile, in the DMB transmission system, the additional SI information is transmitted through the MSC 63 subchannel 200 as shown in FIG. 2. In the present invention, the binary EPG file is used by using the MSC 63 subchannel 200. It is characterized in that a separate FIC type is allocated to the MOT stream to be transmitted.

This MSC 63 sub-channel 200 is shown in more detail in FIG.

3 is a diagram illustrating a data field structure for explaining a method of transmitting EPG information in a digital multimedia broadcasting system according to an embodiment of the present invention. The MSC 63 subchannel 200 to which the present invention is applied has an MSC data group structure. This data group is transmitted in packet units with the same address.

First, the MSC 63 subchannel 200 is largely divided into an MSC data group header, a session header, an MSC data group field, and an MSC data group CRC. The session header is used for recognition of each object in the binary EPG transmission standard, and the MSC data group field is a MOT stream structure, and EPG information is allocated to a separate FIG type according to the present embodiment.

For example, as shown in the middle block of FIG. 2, "FIG (Fast Information Group) type 1/10" is allocated to transmit the MOT stream of the EPG. Here, FIG type 1/10 means FIC field information of FIG type 1 extension 10. FIG. That is, according to the present embodiment, EPG information is transmitted by allocating a separate FIG type from the FIC table of the MSC subchannel 63.

However, FIG information has a disadvantage that only a maximum length of 32 bytes is supported since the field size is limited to 5 bits. Therefore, in the present embodiment, as shown in the lower block of FIG. 3, a 4-bit length extension field is added to the front of the segmentation header to transmit up to 512 bytes per transmission frame. It is characterized by one.

In addition, in the binary EPG transport specification, a session header must be added after the MSC data group header to recognize each object. Whether or not the EPG information is transmitted in a specific transmission frame can be determined by analyzing only the corresponding flag of FIG. Type 0 extension 31 in the FIC table. For example, if the corresponding bit is set to 1 in the FIC table, it may be determined that EPG information is loaded in a specific transmission frame.

That is, the present invention is implemented to obtain EPG information by transmitting the EPG information using the MSC 63 sub-channel containing the additional SI information, and then only check the corresponding flag in the FIC table.

As mentioned above, although this invention was demonstrated concretely based on the Example, this invention is not limited to such an Example, Of course, various deformation | transformation are possible for it within the technical idea and the scope of a claim mentioned later.

According to the present invention, since EPG information can be obtained only by referring to a specific table of FIG, without having to search for several tables of the FIC and perform a channel search in order to obtain EPG information in the DMB system, it is easy to acquire information, It can provide a better service environment.

Claims (5)

An information transmission method in a digital multimedia broadcasting system for transmitting a frame having a data frame structure including an FIC and an MSC, Allocating a separate FIG type in an MSC data group field of a subchannel in which additional SI information in the MSC is recorded; Inserting EPG information for the allocated FIG type; Adding a length extension field to the FIC data frame structure to transmit the additional SI information Information transmission method in a digital multimedia broadcasting system comprising a. The method of claim 1, The method may include: transmitting and assigning a separate FIG type of an FIC table of the data frame structure to a MOT stream through which binary EPG files are transmitted. The method of claim 1, The allocated FIG type is field information of FIG type 1 extension 10. The information transmission method according to claim 1, wherein the FIG type is assigned. The method of claim 1, The method further comprises the step of determining that EPG information is carried in the MSC subchannel when the field of FIG. Type 0 extension 31 is set to bit 1 in the FIC table. Transmission method. The method of claim 4, wherein The EPG information is allocated to the subchannel 63, the information transmission method in a digital multimedia broadcasting system.

Images