KR20110014822A - Dmb tx/rx apparatus and method for transmitting supplement data by idle band of video service - Google Patents

Abstract

PURPOSE: A DMB transceiving apparatus for transmitting additional data by an idle band of a video service and a method thereof are provided to insert additional data to a null packet of video service data encoded in a video multiplexing unit. CONSTITUTION: A video multiplexing unit(220) receives additional data from a data encoder(218). The video multiplexing unit receives encoded video service data from a video encoder(214). The video multiplexing unit detects a null packet from the encoded video service data. The video multiplexing unit inserts the additional data into a payload of the null packet. An ensemble multiplexing unit(230) multiplexes the encoded data by an ensemble signal.

Description

DMB transmission receiver and method for transmitting additional data using idle band of video service {DMB TX / RX APPARATUS AND METHOD FOR TRANSMITTING SUPPLEMENT DATA BY IDLE BAND OF VIDEO SERVICE}

Embodiments of the present invention relate to an apparatus and method for transmitting / receiving additional data through digital multimedia broadcasting (DMB), and more particularly, to an apparatus and method for transmitting / receiving additional data using an idle band of a video service. It is about.

Digital Multimedia Broadcasting (DMB) is a multimedia broadcasting service that combines broadcasting and communication, and provides CD-level audio quality through personal devices such as mobile phones, PDAs (Personal Digital Assistants), and automobiles in mobile or fixed locations. It provides a data and / or video service, and provides bidirectional convergence of mobility and broadcasting and communication that are not limited by time and space.

Terrestrial Digital Multimedia Broadcasting (DMB) is a multimedia broadcasting service including video based on the Digital Audio Broadcasting (DAB) (Eureka-147) system, a European digital radio broadcasting standard that provides CD-quality audio and data services simultaneously. Is the world's first domestic system standard to provide.

The advantage of terrestrial DMB over general digital broadcasting such as Advanced Television Systems Committee (ATSC) or Digital Video Broadcasting (DVB) is that it can listen to the broadcast on the go.

In other words, if the DMB user has a DMB receiving terminal, the user can listen to the broadcast as much as he / she is on the move. In addition, another feature of terrestrial DMB broadcasting is that broadcasting service is not limited to video service, and audio service and data service can be received through broadcasting. Therefore, more channels and services are available through terrestrial DMB than fixed terrestrial digital broadcasting.

The DMB transmits one ensemble over a 1.536 MHz bandwidth, and multiple video, audio and data services are multiplexed into one ensemble.

Recently, DMB receivers are applied with a technology capable of simultaneously decoding three or more services in one ensemble. For example, KBS Star (Video Service), KBS Music (Audio Service), and KBS TPEG (Transportation Travel Information Service) included in one ensemble can be used simultaneously.

The service transmission mode of the DMB includes a stream mode and a packet mode. Stream mode uses a constant bit rate (CBR) service and is used for real-time services such as video and audio services. In addition, the packet mode is transmitted using a packet defined in the Digital Audio Broadcasting (DAB) standard, and is mainly applied to data services such as TPEG (traffic travel information) and BWS (website broadcasting).

DMB services use a convolutional code for error correction during transmission. In addition, in case of DMB video service, Reed Solomon code (RS Code) and convolutional interleaving are additionally used together with a convolutional code for more robust error correction. Therefore, DMB video service is more robust to transmission error than other services. DMB video streams are compressed to MPEG-4 AVC / H.264 and multiplexed to MPEG-2 TS together with audio streams for transmission.

In general, video encoders support Variable Bit Rate (VBR) output. This is to keep the image quality at the optimal state by allocating a lot of bits in the motion and complex screens and allocating the bits in the motion and static screens. to be.

The DMB video service is transmitted in stream mode and uses a constant bit rate (CBR) service, so padding packets (null packets, MPEG- 2 Fill in PID = 0x1FFF) of TS packet header. The output of the DMB video encoder transmitted to the CBR will be described with reference to FIG. 1 below.

1 is a diagram illustrating an output of a DMB video encoder transmitted through a general CBR. Referring to FIG. 1, since a video service output of an encoder occupies a small bit in a motionless and static screen, a large number of null packets for CBR output are generated. However, on a moving and complex screen, the encoder's video service output takes up a lot of bits, so there are no or relatively null packets to maintain the CBR.

That is, null packets are forcibly inserted to provide transmission of the video encoder output, which is a VBR characteristic, to the CBR.

An embodiment of the present invention provides an apparatus and method for transmitting and receiving DMB for transmitting additional data through DMB.

An embodiment of the present invention provides an apparatus and method for transmitting and receiving DMB for transmitting additional data using an idle band of a video service.

An embodiment of the present invention provides a DMB transmitting apparatus and a transmitting method for inserting additional data into a null packet and transmitting the same to a CBR in a video service encoded and output in VBR.

An embodiment of the present invention provides a DMB receiving apparatus and a receiving method for extracting additional data received by being inserted into a null packet of a video service.

An apparatus for transmitting digital multimedia broadcasting according to an embodiment of the present invention may include an additional data generator for generating additional data and an encoded video service data and the additional data, and add the additional data to a null packet of the encoded video service data. Includes a video multiplexer to insert.

The digital multimedia broadcasting receiving apparatus according to an embodiment of the present invention receives a video service data, extracts a null packet from the video service data, and decodes the additional data from the video analyzer and the additional data. It includes a decoder to code.

According to an embodiment of the present invention, a method for transmitting digital multimedia broadcasting includes receiving encoded video service data, receiving additional data, and inserting the additional data into a null packet of the encoded video service data. Include.

A digital multimedia broadcasting reception method according to an embodiment of the present invention includes receiving video service data, extracting a null packet from the video service data, and extracting additional data from the null packet.

An embodiment of the present invention relates to a DMB transmission and reception apparatus and method for transmitting additional data using an idle band of a video service, and receives encoded video service data and additional data and receives a null packet of the encoded video service data. An additional bandwidth for data service can be secured without sacrificing existing quality of service through a DMB transmitting apparatus including a video multiplexer inserting the additional data into the device. In addition, there is an advantage that can achieve the problem to be solved by the present invention without affecting the existing DMB receiver.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Like reference numerals in the drawings denote like elements. If it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

In the case of DMB, a subchannel is formed by enclosing an integer number of 64-bit basic data units called CUs (Capacity Units) in the physical layer, which is allocated to a service. In the case of a service using the stream mode, only one service is transmitted to one subchannel. Therefore, a service using the stream mode always transmits at a constant bit rate, that is, a subchannel-specific CBR regardless of the bit rate of the service itself, and by inserting a null packet that does not affect the video service in the idle band by forcibly inserting a bandwidth. Will be maintained.

In a typical VBR video encoder, a certain quality is guaranteed rather than a constant bandwidth output. Items such as peak signal to noise ratio (PSNR) are mainly used to guarantee a constant picture quality. In such a video encoder, the output bit generation amount of the encoder is less than the transmission capacity in a static motion screen. At this time, the capacity insufficient for the CBR output is multiplexed into null packets to satisfy the allocated transmission capacity. Another method of keeping the transmission capacity constant is to use the quantization control of the video encoder. This can reduce the compression rate on screens with low output bit rates, allowing more bits to be generated. However, this method can reduce null packet insertion by minimizing idle band generation, but it is not a source blocking method.

An embodiment of the present invention relates to an apparatus and method for transmitting and receiving DMB for transmitting additional data using an idle band of a video service.

2 is a diagram illustrating a configuration of a DMB transmitter for transmitting additional data according to an embodiment of the present invention. Referring to FIG. 2, an apparatus for transmitting a DMB according to an embodiment of the present invention includes an encoder unit 210, a video multiplexer 220, an ensemble multiplexer 230, a modulator 240, and an RF (Radio Frequency) transmitter 250. ).

The encoder unit 210 includes a TPEG (Transport Protocol Expert Group) encoder 212, a video encoder 214, an audio encoder 216, and a data encoder 218.

The TPEG encoder 212 receives and encodes TPEG service data, which is a traffic travel information service. The video encoder 214 receives and encodes video service data such as movie and drama video. The audio encoder 216 receives and encodes audio service data such as voice and music to be broadcast. The data encoder 218 receives various data such as traffic travel information, text information, news information, weather information, web information, EPG (Electronic Program Guide), and encodes the data into an appropriate encoder for each service. In addition, the data encoder 218 receives the additional data and transmits the additional data to the video multiplexer 220. Meanwhile, the data encoder 218 may include a TPEG encoder 212.

The video multiplexer 220 receives additional data from the data encoder 218 and receives encoded video service data from the video encoder 214. The video multiplexer 220 detects a null packet in the encoded video service data and inserts additional data into the payload of the null packet. The video multiplexer 220 may be included in the video encoder 214.

Here, the null packet is a packet used to fill an idle band for a fixed rate service (CBR). If the null packet is an MPEG-2 TS packet, the packet identification information (PID) of the packet header is represented by 0x1FFF. That is, the header of the MPEG-2 TS null packet having the additional data inserted therein is the same as the existing structure. The additional data may be travel information associated with a location-based service, restaurant information, region of interest information, BWS website information, slide show information, and update information of various programs. In addition, since additional data is transmitted only when a null packet exists, it is suitable for non-real time information rather than information requiring real time. That is, the additional data is suitable for all data that does not need to consider real time.

According to the MPEG-2 system standard (ISO / IEC 13818-1), null packets are discarded during demultiplexing so as not to affect video service decoding. Therefore, by using the present invention, an idle band as much as a null packet can be usefully used without affecting an existing receiver. Existing null packets contain meaningless values (garbage value, padding data) that are not related to service. However, although a null packet including additional data is discarded by a conventional receiver as a null packet, it can be used to provide useful information in a receiver proposed to recognize it as a null packet including additional data as in the present invention. have.

The ensemble multiplexer 230 receives the encoded TPEG service data, the encoded video service data, the encoded audio service data, and the encoded data service data, multiplexes them into an ensemble signal, and transmits the ensemble signal to the modulator 240. .

The ensemble signal generated as described above is transmitted to the DMB receiving apparatus through the modulator 240 and the RF transmitter 250. In this case, the modulator 240 preferably modulates the ensemble signal in an orthogonal frequency division multiplex (OFDM) scheme.

3 is a diagram illustrating a configuration of a DMB transmitter for transmitting various types of additional data according to an embodiment of the present invention.

Referring to FIG. 3, an apparatus for transmitting DMB according to an embodiment of the present invention includes an encoder 310, an additional data multiplexer 320, and a video multiplexer 330. The encoder unit 310 includes a TPEG encoder 312 for encoding TPEG service data, a BWS encoder 314 for encoding BWS service data, an EPG encoder 316 for encoding EPG service data, and a video encoder for encoding video service data. 318. In addition, the TPEG encoder 312, the BWS encoder 314, and the EPG encoder 316 transmit additional data additionally generated in the corresponding service to the additional data multiplexer 320.

The additional data multiplexer 320 multiplexes additional data received from the TPEG encoder 312, the BWS encoder 314, and the EPG encoder 316 to generate additional data in a packet form as shown in FIG. 5 below.

The additional data multiplexer 320 may schedule a transmission scheduling time of the additional data. In addition, the additional data multiplexer 320 may set a quality (QoS) of the additional data according to the type of the additional data. That is, the additional data multiplexing unit 320 may maintain an optimal transmission environment by automatically adjusting a transmission state according to QoS setting information for each type of additional data even at the same transmission time. The QoS configuration information may include delay information, reliability information, and throughput information.

Here, the delay information is information indicating how far the attribute of additional data is located between non-real time and real time. The reliability information is information indicating whether or not priority transmission and repetitive transmission period according to the importance of additional data. The throughput information is information indicating the amount of additional data to be transmitted.

The additional data for which QoS configuration information requires low latency, high reliability, and high throughput has real time, requires priority transmission and short repetitive transmission period, and means additional amount of additional data to be transmitted.

The video multiplexer 330 receives the additional data in the form of a packet from the additional data multiplexer 320 and receives the encoded video service data from the video encoder 318. The video multiplexer 330 detects a null packet in the encoded video service data, and inserts additional data in the form of a packet into the payload of the null packet. Meanwhile, the additional data multiplexer 320 and the video multiplexer 330 may be included in the video encoder 318.

4 is a diagram illustrating another configuration of an apparatus for transmitting DMB for transmitting various types of additional data according to an embodiment of the present invention.

The DMB transmitter of FIG. 4 transmits various types of additional data similarly to the DMB transmitter of FIG. 3. Unlike the DMB transmission apparatus of FIG. 3, the DMB transmission apparatus of FIG. 4 transmits two video services using two video encoders. Referring to FIG. 4, the DMB transmission apparatus according to the embodiment of the present invention includes an encoder 410, an additional data multiplexer 420, a first video multiplexer 432, and a second video multiplexer 434. The encoder unit 410 encodes a TPEG encoder 412 for encoding TPEG service data, a BWS encoder 414 for encoding BWS service data, an EPG encoder 416 for encoding EPG service data, and two video service data, respectively. A first video encoder 411 and a second video encoder 418. In addition, the TPEG encoder 412, the BWS encoder 414, and the EPG encoder 416 transmit additional data additionally generated in the corresponding service to the additional data multiplexer 420.

The additional data multiplexer 420 multiplexes additional data received from the TPEG encoder 412, the BWS encoder 414, and the EPG encoder 416 to generate additional data in a packet form as shown in FIG. 5 below. The additional data multiplexer 420 transmits the additional data in the form of a packet to the first video multiplexer 432 or the second video multiplexer 434.

The first video multiplexer 432 and the second video multiplexer 434 receive additional data in the form of packets from the additional data multiplexer 420, and correspond to the first video encoder 411 and the second video encoder. Receive encoded video service data from 418. The first video multiplexer 432 and the second video multiplexer 434 detect a null packet in the encoded video service data, and insert additional data in the form of a packet into the payload of the null packet. The additional data multiplexer 420 and the video multiplexers 432 and 434 may be included in the video encoders 411 and 418.

FIG. 5 is a diagram illustrating additional data in a packet form for transmitting various types of additional data according to an embodiment of the present invention.

Referring to FIG. 5, the additional data packet includes a header 510, a data field 520, and a cyclic redundancy check (CRC) 530.

The header 510 includes a sync field (Sync) 511, a type field (App.Type) 512, an address field (Add) 513, a count field (Count) 514, and a length field (Length) 515. ) And a reserved field (Rfu: Reserved for Future Use) 516.

The sync field 511 is used to synchronize packets. The sync field 511 may have a size of 8 bits.

The type field 512 stores the type of additional data transmitted in the data field 520. The type field 512 may have a size of 4 bits.

The address field 513 stores information about a target terminal range to receive additional data or a target area related to the additional data. The address field 513 may have a size of 8 bits.

The count field 514 is a field used to identify whether it is a continuous packet. The count field 514 increases the stored value by 1 if it is a continuous packet following the previous packet. The count field 514 may have a size of 4 bits.

The length field 515 stores information indicating the length of the data field 520. The length field 515 may have a size of 10 bits.

Reserved field 516 is a field that is not currently used but is reserved for use if it is destined for the future. The reserved field 516 may have a size of 6 bits.

The data field 520 stores additional data to be transmitted as information included in the payload.

The CRC 530 is information included in the payload and used to identify whether the received additional data packet is normal or error.

6 is a diagram illustrating a process of inserting additional data in the form of a packet into a null packet according to an embodiment of the present invention.

Referring to FIG. 6, the additional data multiplexer 320 outputs additional length data packets of variable length in step 610.

In operation 620, the video multiplexer 330 cuts the additional data packets into fixed lengths and inserts the additional data packets into payloads of null packets having a fixed length.

In operation 630, the video multiplexer 330 inserts a Reed-Solomon (RS) code for error correction into the payload of the null packet having a fixed length.

7 is a diagram illustrating a configuration of a DMB receiving apparatus for receiving additional data according to an embodiment of the present invention. Referring to FIG. 7, an RF receiver 710, an ensemble analyzer 720, a decoder 730, and an application 740 are included.

The RF receiver 710 receives an ensemble of terrestrial DMB desired by a user.

The ensemble analyzer 720 analyzes various services included in the ensemble received by the RF receiver 710 and transmits them to the corresponding decoder. The ensemble analyzer 720 includes a TPEG analyzer 722, a video analyzer 724, an audio analyzer 726, and a data analyzer 728. The ensemble signal may be configured as shown in FIG. 8 below.

8 is a diagram illustrating a configuration example of an ensemble including a plurality of services. Referring to FIG. 8, the ensemble signal may be configured as a first ensemble 810 having one video service data and a second ensemble 820 having two video service data. When two video service data are included as in the second ensemble 820, null packets are generated more frequently than the first ensemble 810. Accordingly, the second ensemble 820 may include more additional data than the first ensemble 810.

The TPEG analyzer 722 extracts the TPEG service data from the ensemble signal and transmits it to the TPEG decoder 732.

The video analyzer 724 extracts video service data from the ensemble signal and extracts a null packet from the video service data. The video analyzer 724 extracts additional data from the extracted null packet and transmits the additional data to the data decoder 738, and transmits video service data excluding the null packet to the video decoder 734.

The audio analyzer 726 extracts audio service data from the ensemble signal and transmits the audio service data to the audio decoder 736.

The data analyzer 728 extracts data service data from the ensemble signal and transmits the data service data to the data decoder 738. Meanwhile, the TPEG analyzer 722 may be configured to be included in the data analyzer 728.

The decoder 730 decodes various service data, including the TPEG decoder 732, the video decoder 734, the audio decoder 736, and the data decoder 738, and transmits it to the application unit 740. Meanwhile, the TPEG decoder 732 may be configured to be included in the data decoder 738.

The application unit 740 receives the decoded data from the decoder 730 and outputs the data in a form desired by the user.

The additional data extracted from the null packet may be decoded through an associated decoder in the data decoder 738, synthesized with another data service in the application unit 740, and provided to the user or provided to the user in an independent service form.

Hereinafter, a method of transmitting and receiving additional data using an idle band of a video service according to the present invention configured as described above will be described with reference to the drawings.

9 is a flowchart illustrating a process of transmitting additional data according to an embodiment of the present invention. Referring to FIG. 9, when the additional data service event occurs in step 910, the DMB transmitting apparatus receives the additional data in step 912.

In operation 914, the DMB transmitting apparatus inserts additional data into a payload of a null packet generated during video encoding. In operation 916, the DMB transmitting apparatus multiplexes the video service data including the null packet into which the additional data is inserted together with other service data included in the ensemble to generate an ensemble signal.

In this case, the null packet is a packet used to fill an idle band for a fixed rate service (CBR). If the null packet is an MPEG-2 TS packet, the packet identification information (PID) of the packet header is represented by 0x1FFF. The additional data may be travel information associated with a location-based service, restaurant information, region of interest information, BWS website information, slide show information, and update information of various programs.

In step 918, the DMB transmitting apparatus modulates the ensemble signal, and in step 920, the DMB transmitting apparatus transmits the modulated ensemble signal to the DMB receiving apparatus.

10 is a flowchart illustrating a process of receiving additional data according to an embodiment of the present invention. Referring to FIG. 10, when the DMB receiving apparatus receives the ensemble signal in step 1010, the method proceeds to step 1012 and extracts a null packet from a video service. Here, the null packet is a packet used to fill an idle band for a fixed rate service (CBR).

In operation 1014, the DMB receiving apparatus extracts additional data from a null packet. Here, the additional data may be travel information associated with the location-based service, restaurant information, region of interest information, BWS website information, slide show information, and update information of various programs.

In operation 1016, the DMB receiving apparatus provides a preset service that requires additional data. A typical preset service requiring additional data may be a navigation service using a TPEG service.

In operation 1018, the DMB receiving apparatus outputs a service using additional data.

In addition, embodiments of the present invention include a computer readable medium including program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions on the medium may be those specially designed and constructed for the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents and equivalents of the claims as well as the claims to be described later belong to the scope of the present invention. .

1 is a diagram illustrating an output of a DMB video encoder outputted in a general CBR;

2 is a diagram illustrating a configuration of a DMB transmitter for transmitting additional data according to an embodiment of the present invention;

3 is a diagram illustrating a configuration of a DMB transmitter for transmitting various types of additional data according to an embodiment of the present invention;

4 is a diagram illustrating another configuration of a DMB transmitter for transmitting various types of additional data according to an embodiment of the present invention;

5 is a diagram illustrating additional data in the form of a packet for transmitting various types of additional data according to an embodiment of the present invention;

6 is a diagram illustrating a process of inserting additional data in a packet form into a null packet according to one embodiment of the present invention;

7 is a diagram illustrating a configuration of a DMB receiving apparatus for receiving additional data according to an embodiment of the present invention;

8 is a diagram illustrating a configuration example of an ensemble including a plurality of services;

9 is a flowchart illustrating a process of transmitting additional data according to an embodiment of the present invention;

10 is a flowchart illustrating a process of receiving additional data according to an embodiment of the present invention.

Claims (26)

An additional data generator for generating additional data; And And a video multiplexer configured to receive encoded video service data and the additional data and insert the additional data into a null packet of the encoded video service data. Digital multimedia broadcasting transmission device. The method of claim 1, And an additional data multiplexer configured to receive various types of additional data and to multiplex the additional data packet. The video multiplexer inserts the additional data packet into the null packet. Digital multimedia broadcasting transmission device. The method of claim 2, The additional data multiplexer, Scheduling the delivery time of the various types of additional data Digital multimedia broadcasting transmission device. The method of claim 2, The additional data multiplexer, A quality (QoS) of the additional data is set according to the type of the additional data, and the various types of additional data are multiplexed into the additional data packet in consideration of real time, priority, and data amount according to the quality setting. Digital multimedia broadcasting transmission device. The method of claim 2, The additional data packet is, A header and a data field into which the various kinds of additional data are inserted. Digital multimedia broadcasting transmission device. The method of claim 5, The header, A synchronization field for synchronization of the additional data packet, A type field indicating a type of additional data included in the data field; An address field indicating information about a range of a target terminal to receive the additional data or a target area related to the additional data; A count field for identifying whether the additional data packet is a continuous packet; At least one length field indicating the length of the data field Digital multimedia broadcasting transmission device. The method of claim 1, The additional data, At least one of travel information associated with the location-based service, restaurant information, region of interest information, BWS (Broadcast Website Service) website information, slide show information and updated information of various programs Digital multimedia broadcasting transmission device. The method of claim 1, The video multiplexer, Inserting the additional data into the payload of the null packet Digital multimedia broadcasting transmission device. A video analyzer configured to receive video service data, extract a null packet from the video service data, and extract additional data from the null packet; And A decoder that decodes the additional data. Digital multimedia broadcasting receiver. 10. The method of claim 9, The video analysis unit, Extracting the additional data from the payload of the null packet Digital multimedia broadcasting receiver. 10. The method of claim 9, The video analysis unit, Extracting an additional data packet that may include various types of additional data, checking the type of the additional data, and transmitting the additional data packet to a corresponding decoder Digital multimedia broadcasting receiver. The method of claim 11, The additional data packet is, A header and a data field into which the various kinds of additional data are inserted. Digital multimedia broadcasting receiver. The method of claim 12, The header, A synchronization field for synchronization of the additional data packet, A type field indicating a type of additional data included in the data field; An address field indicating information about a range of a target terminal to receive the additional data or a target area related to the additional data; A count field for identifying whether the additional data packet is a continuous packet; At least one length field indicating the length of the data field Digital multimedia broadcasting receiver. Receiving encoded video service data; Receiving additional data; And Inserting said additional data into a null packet of said encoded video service data; Digital multimedia broadcasting transmission method. The method of claim 14, The receiving of the additional data may include receiving various types of additional data, Multiplexing the various types of additional data into additional data packets; Digital multimedia broadcasting transmission method. The method of claim 15, Multiplexing the additional data packet, The transmission time of the various types of additional data is scheduled and multiplexed into the additional data packet. Digital multimedia broadcasting transmission method. The method of claim 15, Multiplexing the additional data packet, Setting a quality (QoS) of the additional data according to the type of the additional data; And Multiplexing the various types of additional data into the additional data packet in consideration of real time, priority, and data amount according to the quality setting; Digital multimedia broadcasting transmission method. The method of claim 15, The additional data packet is, A header and a data field into which the various kinds of additional data are inserted. Digital multimedia broadcasting transmission method. The method of claim 15, The header, A synchronization field for synchronization of the additional data packet, A type field indicating a type of additional data included in the data field; An address field indicating information about a range of a target terminal to receive the additional data or a target area related to the additional data; A count field for identifying whether the additional data packet is a continuous packet; At least one length field indicating the length of the data field Digital multimedia broadcasting transmission method. The method of claim 14, The additional data, At least one of travel information associated with the location-based service, restaurant information, region of interest information, BWS (Broadcast Website Service) website information, slide show information and updated information of various programs Digital multimedia broadcasting transmission method. The method of claim 14, Inserting the additional data, Inserting the additional data into the payload of the null packet Digital multimedia broadcasting transmission method. Receiving video service data; Extracting a null packet from the video service data; And Extracting additional data from the null packet; How to receive digital multimedia broadcasting. The method of claim 22, Extracting the null packet, Extracting the additional data from the payload of the null packet How to receive digital multimedia broadcasting. The method of claim 22, Extracting an additional data packet that may include various types of additional data from the null packet; And Extracting the various types of additional data from the additional data packet. How to receive digital multimedia broadcasting. The method of claim 24, The additional data packet is, A header and a data field into which the various kinds of additional data are inserted. How to receive digital multimedia broadcasting. The method of claim 25, The header, A synchronization field for synchronization of the additional data packet, A type field indicating a type of additional data included in the data field; An address field indicating information about a range of a target terminal to receive the additional data or a target area related to the additional data; A count field for identifying whether the additional data packet is a continuous packet; At least one length field indicating the length of the data field How to receive digital multimedia broadcasting.

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