CN101513054B - Method for transforming terrestrial dmb contents and gateway employing the same - Google Patents

Abstract

The present invention provides a gateway for transforming terrestrial Digital Multimedia Broadcasting (DMB) content. The gateway for transforming terrestrial DMB content includes: Ensemble Transport Interface (ETI) demultiplexing unit for dividing terrestrial DMB content with ETI frame format into Fast Information Channel (FIC) and Main Service Channel (MSC) ; The session description protocol (SDP) packet processing unit is used to convert the FIC into an SDP packet; the transmission control protocol/Internet protocol (TCP/IP) packet generation unit is used to generate a TCP/IP packet based on the SDP packet; real-time transport protocol (RTP) packet processing unit for converting the MSC into first RTP packets; User Datagram Protocol/Internet Protocol (UDP/IP) packet generation unit for generating UDP/IP packets based on the RTP packets; and IP output A unit, configured to transmit the TCP/IP packet and the UDP/IP packet through the IP network.

Description

Method for transforming terrestrial digital multimedia broadcasting content and gateway using the method

technical field

The present invention relates to terrestrial digital multimedia broadcasting (DMB); more particularly, to a method for transforming terrestrial DMB content and a gateway employing the same, by considering the characteristics of various telecommunication networks and the formation of terrestrial DMB content, not only by The terrestrial DMB private network also effectively provides DMB services through various telecommunication networks. the

Background technique

In general, terrestrial digital multimedia broadcasting (DMB) is a digital multimedia broadcasting service that provides terrestrial DMB content such as audio, data, and multimedia through a terrestrial DMB network while subscribers are in motion. The terrestrial DMB network is a private network with a low transfer rate implemented by a dedicated interface technology such as Service Transport Interface (STI), Ensemble Transport Interface (ETI) and EN300-401 Coded Orthogonal Frequency Division Multiplexing (COFDM). Here, a network supporting terrestrial DMB is defined as a terrestrial DMB private network. the

In the terrestrial DMB private network, highly compressed coded content is generated for terrestrial DMB service, and terrestrial DMB content can be provided through a channel with a low transmission rate. Here, highly compressed encoded content provided through the terrestrial DMB private network is defined as terrestrial DMB content. the

In the past, terrestrial DMB content was provided through a terrestrial DMB private network. However, when the terrestrial DMB service is activated, terrestrial DMB contents are various. Therefore, requests from users who want to receive terrestrial DMB contents through various telecommunication networks as well as terrestrial DMB private networks are increasing. the

There are traditional delivery methods of terrestrial DMB content over Internet Protocol (IP) networks. This traditional transmission method abstractly presents the IP encapsulation of terrestrial DMB content and the transmission of IP packets over the IP network. This traditional transmission method has several problems. First, it does not take into account the characteristics of various IP networks. In addition, characteristics of a multimedia transmission technology through an IP network in which media information and control information are separately transmitted and formation of terrestrial DMB content based on the terrestrial DMB standard are ignored. That is, it is uncertain whether transmission of terrestrial DMB content over IP networks is possible. Therefore, a system for providing terrestrial DMB services through an IP network considering the characteristics of various telecommunication networks and the formation of terrestrial DMB contents is required. the

Contents of the invention

technical problem

Therefore, it is an object of the present invention to provide a method for transforming terrestrial DMB contents and a gateway employing the same, by considering the characteristics of various telecommunication networks and the formation of terrestrial DMB contents not only through a terrestrial DMB private network but also through Various telecommunication networks to efficiently provide DMB services. the

Other objects and advantages of the present invention will be clearly understood in the following description and examples. Moreover, it is obvious to those skilled in the art that the objects and advantages of the present invention can be achieved by the claimed components and combinations thereof. the

Technical solutions

According to one aspect of the present invention, there is provided a gateway for transforming terrestrial digital multimedia broadcasting (DMB) content, comprising: an ensemble transport interface (ETI) demultiplexing unit for converting terrestrial DMB content is divided into Fast Information Channel (FIC) and Main Service Channel (MSC); Session Description Protocol (SDP) packet processing unit for converting FIC to SDP packets; Transmission Control Protocol/Internet Protocol (TCP/IP) packet generation A unit for generating a TCP/IP packet based on the SDP packet; a real-time transport protocol (RTP) packet processing unit for converting the MSC into a first RTP packet; User Datagram Protocol/Internet Protocol (UDP/IP) packet generation a unit for generating a UDP/IP packet based on the RTP packet; and an IP output unit for transmitting the TCP/IP packet and the UDP/IP packet through the IP network. the

According to another aspect of the present invention, there is provided a method for transforming terrestrial digital multimedia broadcasting (DMB) content, comprising the steps of: a) demultiplexing terrestrial DMB content having an Ensemble Transport Interface (ETI) frame format multiplexing into a Fast Information Channel (FIC) and a Main Service Channel (MSC); b) converting the FIC into a Session Description Protocol (SDP) packet, and generating a Transmission Control Protocol/Internet Protocol (TCP/IP) packet based on the SDP packet; c) converting the MSC into RTP packets and generating UDP/IP packets based on the RTP packets; and d) transmitting the TCP/IP packets and UDP/IP packets over the IP network. the

According to another aspect of the present invention, a kind of terrestrial digital multimedia function (DMB) content service system is provided, comprising: encoding part, for encoding DAB audio source, DAB data source and multimedia source; Ensemble multiplexing A component for multiplexing said encoded DAB audio, encoded DAB data and encoded multimedia into terrestrial DMB content based on the ETI standard; a gateway for transforming the terrestrial DMB content into IP-formatted Grouping, to access the IP network, or transmit the terrestrial DMB content to a coded orthogonal frequency division multiplexing (COFDM) encoding part, to access the terrestrial DMB private network; encoding and transmitting the encoded terrestrial DMB content, wherein the gateway demultiplexes the terrestrial DMB content into FIC and MSC based on the ETI frame format, converts the FIC into packets having an IP format based on SDP and TCP/IP, and MSC is converted into packets with IP format based on RTP and UDP/IP. the

According to another aspect of the present invention, there is provided a gateway for transforming terrestrial digital multimedia broadcasting DMB content, comprising: an ensemble transmission interface ETI demultiplexing component for dividing the terrestrial DMB content with ETI frame format It is the fast information channel FIC and the main service channel MSC; the session description protocol SDP packet processing component is used to convert the FIC into an SDP packet; the transmission control protocol/Internet protocol TCP/IP packet generation component is used to generate a TCP/IP packet based on the SDP packet IP packet; Real-time Transport Protocol RTP packet processing section for converting the MSC into RTP packet; User Datagram Protocol/Internet Protocol UDP/IP packet generation section for generating UDP/IP packet based on the RTP packet; and IP output A component for transmitting said TCP/IP packet and UDP/IP packet over an IP network. the

According to another aspect of the present invention, there is provided a method for transforming terrestrial digital multimedia broadcasting DMB content, comprising the following steps: a) demultiplexing the terrestrial DMB content with Ensemble Transport Interface ETI frame format into fast The information channel FIC and the main service channel MSC; b) convert the FIC into a session description protocol SDP packet, and generate a transmission control protocol/Internet protocol TCP/IP packet based on the SDP packet; c) convert the MSC into a real-time transport protocol RTP packet , and generating User Datagram Protocol/Internet Protocol UDP/IP packets based on the RTP packets; and d) transmitting said TCP/IP packets and UDP/IP packets over an IP network. the

According to another aspect of the present invention, a kind of terrestrial digital multimedia broadcasting DMB content service system is provided, comprising: encoding part, used for encoding DAB audio source, DAB data source and multimedia source; Ensemble multiplexing part, for multiplexing said coded DAB audio, coded DAB data and coded multimedia into terrestrial DMB content based on the Ensemble Transport Interface ETI standard; a gateway for transforming the terrestrial DMB content into a The grouping of internet protocol IP format, to access IP network, or transmit this terrestrial DMB content to coded orthogonal frequency division multiplexing COFDM encoding part, to access terrestrial DMB private network; and this COFDM encoding part, for based on COFDM Encode the terrestrial DMB content and transmit the encoded terrestrial DMB content, wherein the gateway demultiplexes the terrestrial DMB content into fast information channel FIC and main service channel MSC based on the ETI frame format, based on the session description protocol SDP and Transmission Control Protocol/Internet Protocol TCP/IP converts FIC into packets with IP format, and converts MSC into packets with IP format based on RTP and UDP/IP. the

beneficial effect

The present invention can effectively provide users with terrestrial DMB services not only through terrestrial DMB private networks but also through various telecommunication networks by considering the characteristics of various telecommunication networks and the formation of terrestrial DMB contents. the

Description of drawings

The above and other objects and features of the present invention will become clear from the following description of preferred embodiments given in conjunction with the accompanying drawings, wherein:

1 is a block diagram illustrating a conventional terrestrial digital multimedia broadcasting (DMB) service system;

Figure 2 is a block diagram illustrating a gateway according to an embodiment of the invention;

Figure 3 is a detailed block diagram illustrating the first content transformer of Figure 2;

Figure 4 is a detailed block diagram illustrating the second content transformer of Figure 2;

Figure 5 is a detailed block diagram illustrating a third content transformer of Figure 2;

Fig. 6 is a flowchart illustrating a method for transforming terrestrial DMB content according to an embodiment of the present invention;

Figure 7 is a detailed flowchart illustrating a method for transforming the Fast Information Channel (FIC) of Figure 6;

FIG. 8 is a detailed flowchart illustrating a method for converting the main service channel (MSC) of FIG. 6 according to the first embodiment of the present invention;

Figure 9 is a detailed flowchart illustrating a method for converting an MSC according to a second embodiment of the present invention; and

FIG. 10 is a detailed flowchart illustrating a method for transforming an MSC according to a third embodiment of the present invention. the

Detailed ways

Other objects and aspects of the present invention will become apparent through the following description of the embodiments set forth below with reference to the accompanying drawings. the

FIG. 1 is a block diagram illustrating a conventional terrestrial digital multimedia broadcasting (DMB) service system. the

As shown, the terrestrial DMB service system of the present invention includes a digital audio broadcasting (DAB) audio encoder 100, a DAB data encoder 200, a multimedia encoder 300, an ensemble multiplexer 400, a gateway 500 and an encoding quadrature Frequency Division Multiplexing (COFDM) encoder 600 . the

The DAB audio encoder 100, the DAB data encoder 200, and the multimedia encoder 300 respectively encode the DAB audio source, the DAB data source, and the multimedia source based on the Digital Multimedia Broadcasting (DMB) standard to thereby generate encoded DAB audio, Encoded DAB data and encoded multimedia. the

The ensemble multiplexer 400 multiplexes the encoded DAB audio encoded in the DAB audio encoder 100, the encoded DAB data encoded in the DAB data encoder 200, and the encoded multimedia encoded in the multimedia encoder 300. Multiplexed into an Ensemble Transport Interface (ETI) frame, and the ETI frame is output to the gateway 500 . The ETI frame includes a Main Service Channel (MSC), Fast Information Channel (FIC) and an ETI header. MSC includes terrestrial DMB content information, namely DAB audio information, DAB data information and multimedia information. The FIC includes control information for controlling terrestrial DMB content, that is, configuration information and service information of terrestrial DMB content. The ETI header includes general construction information of the ETI frame. That is, the terrestrial DMB content is generated based on the format of the ETI frame including MSC, FIC, and ETI headers based on the terrestrial DMB standard. the

The gateway 500 transmits the terrestrial DMB content generated through the format of the ETI frame to the COFDM encoder 600 or transforms the terrestrial DMB content into packets having an Internet Protocol (IP) format based on a network accessed by the terrestrial DMB service system. In a DMB private network, the gateway 500 bypasses the terrestrial DMB content to the COFDM encoder 600 . Then, the COFDM encoder 600 encodes the terrestrial DMB content based on the COFDM format, and transmits the encoded terrestrial DMB content through the DMB private network. In addition, in various IP-based telecommunication networks other than the DMB private network, the gateway 500 converts the terrestrial DMB content generated based on the ETI frame format into the IP format in various telecommunication networks. A specific diagram of the gateway will be described in detail with reference to FIGS. 2 to 5 . the

That is, by adding the terrestrial DMB content conversion gateway 500, the terrestrial DMB service system provides terrestrial DMB content through the terrestrial DMB private network and various telecommunication networks. the

FIG. 2 is a block diagram illustrating a gateway according to an embodiment of the present invention. the

As shown, when the terrestrial DMB service system accesses the terrestrial DMB private network, the gateway 500 bypasses the terrestrial DMB content generated through the ETI frame format. Therefore, the user terminal (that is, the dedicated terminal for terrestrial DMB) connected to the terrestrial DMB private network can be served by the traditional terrestrial DMB service system without adding the gateway 500. the

Here, since the terrestrial DMB service system according to the present invention can access not only the terrestrial DMB private network but also various telecommunication networks, the gateway 500 includes a plurality of content converters to transform the terrestrial DMB content based on the characteristics of various telecommunication networks . For example, the various telecommunication networks may be wired Internet, wireless Internet such as wireless LAN and wibro, mobile telecommunication networks such as Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM). Wired Internet is the most stable and has a high transmission bandwidth, whereas a mobile telecommunication network is the least stable and has a low transmission bandwidth. That is, the gateway 500 must be designed to support efficient transformation of terrestrial DMB content by each telecommunication network taking into account the above-mentioned characteristics of the telecommunication network. the

For example, the gateway 500 includes three content transformers, namely a first content transformer 210 , a second content transformer 220 and a third content transformer 230 . Thereafter, the first content changer 210, the second content changer 220, and the third content changer 230 are described corresponding to wired Internet, wireless Internet, and mobile telecommunication network, respectively. the

FIG. 3 is a detailed block diagram illustrating the first content transformer of FIG. 2 . the

As shown in FIG. 3 , the first content converter 210 includes an ETI demultiplexing unit 301, a Session Description Protocol (SDP) packet processing unit 302, a Transmission Control Protocol/Internet Protocol (TCP/IP) generating unit 303, a real-time A transport protocol (RTP) packet processing unit 303 , a user datagram protocol/Internet protocol (UDP/IP) generating unit 305 , and an IP output unit 306 . As mentioned above, the first content changer is designed to support wired Internet. the

When the telecommunication network is judged to be the wired Internet, the terrestrial DMB content having the ETI frame format is input to the first content transformer 210 . the

The ETI frame includes MSC with information of terrestrial DMB content, FIC with control information of terrestrial DMB content, and ETI header with configuration information of the ETI frame. the

The ETI demultiplexing unit 301 analyzes the ETI header of the input ETI frame, demultiplexes the ETI frame into MSC and FIC, and outputs the FIC to the SDP packet processing unit 302 and the MSC to the RTP packet processing respectively Unit 304. the

The SDP packet processing unit 302 forms an SDP packet based on the input FIC. Here, the SDP packet is generated based on SDP, which is a protocol describing a session in Internet multimedia transfer technology. The SDP packet includes the session information of the terrestrial DMB content, such as the name and purpose of the session, the creator information of the session, the media information of the session and the information required for transmitting the media (such as address, port, format). That is, the SDP packet includes session information and control information of terrestrial DMB content included in the FIC. The session information of the SDP packet is input by the user terminal and stored in a predetermined database. Therefore, an SDP packet is generated based on the session information and the control information of the FIC. the

The TCP/IP generation unit 303 receives the SDP packet input from the SDP packet processing unit 302, generates a TCP/IP packet and outputs the TCP/IP packet to the IP output unit 306 for transmitting the SDP packet by IP format. Then, the IP output unit 306 transmits the TCP/IP packet through the wired Internet. That is, SDP and TCP/IP are used for converting FIC into packets with IP format. the

Meanwhile, the RTP packet processing unit 304 receives the MSC and forms an RTP packet. Here, the RTP packet is generated based on RTP, which is a protocol for transferring media in Internet multimedia transfer technology. The RTP packet includes information of terrestrial DMB content, such as DAB audio information, DAB data information, and multimedia information. In the present invention, RTP packets are generated by considering the transmission characteristics of terrestrial DMB content. That is, the size and payload type information of RTP packets are set up for transmission of terrestrial DMB content. For example, the size of the RTP packet is defined based on 8 bytes the same as the size of the terrestrial DMB content, and the payload type of the RTP packet can be judged as the terrestrial DMB content. the

The UDP/IP generation unit 305 receives the RTP packet input from the RTP packet processing unit 304, generates a UDP/IP packet, and outputs the UDP/IP packet to the IP output unit 306 for transmitting the RTP packet by IP format. Then, the IP output unit 306 transmits the UDP/IP packet through the wired Internet. That is, RTP and UDP/IP are used for converting the MSC into packets with IP format. the

As described above, the terrestrial DMB content is divided by the media information and control information of the terrestrial DMB content. Media information of terrestrial DMB content is converted by RTP, which is a protocol for transmitting media in Internet multimedia delivery technology, and control information of terrestrial DMB content is converted by SDP, which is a protocol for describing sessions in Internet multimedia delivery technology. Therefore, the terrestrial DMB service system can be implemented to be suitable for the characteristics of Internet multimedia transmission technology, and separately transmit the media information and control information of the terrestrial DMB content. the

FIG. 4 is a detailed block diagram illustrating the second content transformer of FIG. 2 . the

As shown, the second content transformer 220 includes an ETI demultiplexing unit 401, an SDP packet processing unit 402, a TCP/IP generating unit 403, an MSC demultiplexing unit 404, an outer encoding unit 405, an RTP packet A processing unit 406 , a UDP/IP generation unit 407 , and an IP output unit 408 . As mentioned above, the second content changer is designed to support wireless Internet. the

Here, the ETI demultiplexing unit 401, the SDP packet processing unit 402, the TCP/IP generation unit 403, the RTP packet processing unit 406, the UDP/IP generation unit 407, and the IP output unit 408 perform the ETI solution similar to that of FIG. 3 respectively. Multiplexing unit 301 , SDP packet processing unit 302 , TCP/IP generation unit 303 , RTP packet processing unit 304 , UDP/IP generation unit 305 , and IP output unit 306 have the same functions. the

Since the second content converter 220 corresponds to the unstable wireless Internet having a narrower bandwidth than the wired Internet, an additional decoding process of the MSC is required for improving transfer efficiency. The second content transformer 220 divides the MSC into subchannels (ie, DAB audio stream, DAB data stream, and multimedia stream), and transforms each subchannel. the

The MSC demultiplexing unit 404 receives the MSC from the ETI demultiplexing unit 401, and demultiplexes the MSC into a DAB audio stream, a DAB data stream, and a multimedia stream. The RTP packet processing unit 406 generates RTP packets based on the DAB audio stream and the DAB data stream. Then, the UDP/IP generation unit 407 generates UDP/IP packets based on the RTP packets, and outputs the UDP/IP packets to the IP output unit 408 . the

On the other hand, the multimedia stream is externally decoded in the external decoding unit 405 . Here, outer decoding is a process of removing unnecessary bytes in the multimedia stream. Since the multimedia stream includes additional bytes through outer encoding, no additional bytes are necessary for IP transport. For example, when the multimedia stream is an MPEG-2 transport stream (TS), the external decoding unit 405 receives the MPEG-2 transport stream TS whose size is increased to 204 bytes by external encoding, and generates a 188-byte TS by external decoding. MPEG-2 Multimedia TS. the

The RTP packet processing unit 406 generates RTP packets based on the externally decoded multimedia stream. The UDP/IP generation unit 407 generates UDP/IP packets based on the RTP packets, and outputs the UDP/IP packets to the IP output unit 408 . the

As described above, the second content converter 220 divides the MSC into subchannels, converts and transmits each subchannel. In particular, the second content transformer 220 reduces the size of the multimedia TS by using additional outer decoding. Therefore, the second content converter 220 is required for unstable wireless Internet having a narrower bandwidth than wired Internet. the

FIG. 5 is a detailed block diagram illustrating a third content transformer of FIG. 2 . the

As shown, the third content transformer 220 includes an ETI demultiplexing unit 501, an SDP packet processing unit 502, a TCP/IP generating unit 503, an MSC demultiplexing unit 504, an outer encoding unit 505, a multimedia stream Analysis/demultiplexing unit 506 , video elementary stream (ES) generation unit 507 , audio ES generation unit 508 , RTP packet processing unit 509 , UDP/IP generation unit 510 , and IP output unit 511 . As mentioned above, the third content changer is designed to support mobile telecommunications networks. the

Here, the ETI demultiplexing unit 501, the SDP packet processing unit 502, the TCP/IP generation unit 503, the RTP packet processing unit 509, the UDP/IP generation unit 510, and the IP output unit 511 perform the same operations as in FIGS. 3 and 4, respectively. Shown are ETI demultiplexing units 301 and 401, SDP packet processing units 302 and 402, TCP/IP generation units 303 and 403, RTP packet processing units 304 and 406, UDP/IP generation units 305 and 407, and IP Output units 306 and 408 have the same function. In addition, the MSC demultiplexing unit 504 and the outer encoding unit 505 respectively perform the same functions as the MSC demultiplexing unit 404 and the outer encoding unit 405 of FIG. 4 . the

Since the third content converter 230 corresponds to an unstable mobile telecommunication network having narrower bandwidth than wired Internet and wireless Internet, an additional decoding process of multimedia output from the external decoding unit 505 is required. The third content transformer 230 divides the multimedia stream into an audio stream and a video stream, and transforms them. the

The multimedia stream analysis/demultiplexing unit 506 receives the multimedia transport stream from the external decoding unit 505, analyzes the multimedia stream, and demultiplexes the multimedia stream into a video transport stream (TS) and an audio TS. the

The video ES generating unit 507 receives the video TS from the multimedia stream analyzing/demultiplexing unit 506, and generates a video TS by demultiplexing and depacketizing the video TS. The RTP packet processing unit 509 receives a video ES, and generates an RTP packet based on the video ES. Then, the UDP/IP generation unit 510 receives the RTP packet, generates a UDP/IP packet based on the RTP packet, and outputs the UDP/IP packet to the IP output unit 511 . the

Meanwhile, the audio ES generating unit 508 receives the audio TS from the multimedia stream analyzing/demultiplexing unit 506, and generates an audio ES by demultiplexing and depacketizing the audio TS. The RTP packet processing unit 509 receives an audio ES, and generates an RTP packet based on the audio ES. Then, the UDP/IP generation unit 510 receives the RTP packet, generates a UDP/IP packet based on the RTP packet, and outputs the UDP/IP packet to the IP output unit 511 . the

As described above, the third content converter 230 divides the multimedia stream into a video TS and an audio TS, and generates a video ES and an audio ES by performing additional decoding of the video TS and audio TS, thereby reducing a data size. Therefore, the third content transformer 230 is suitable for supporting unstable mobile telecommunication networks with narrower bandwidth than wireless Internet. the

FIG. 6 is a flowchart illustrating a method for transforming terrestrial DMB content according to an embodiment of the present invention. the

First, in step S601, the terrestrial DMB content with ETI frame format is demultiplexed into FIC and MSC. Here, when converting the terrestrial DMB content of all types of networks, step S601 is performed in the same way. That is, terrestrial DMB content is divided into FIC (Control Information) and MSC (Media Information) according to the characteristics of Internet multimedia transmission technology. the

In step S602, the FIC is converted into a packet in IP format, so as to access the telecommunication network based on IP. Here, when transforming terrestrial DMB content of all types of networks, step S602 is performed in the same way. Next, the FIC conversion process will be described in detail with reference to FIG. 7 . the

In step S603, the MSC is converted into a packet in IP format, so as to access the telecommunication network based on IP. Here, the MSC conversion process is performed differently when converting terrestrial DMB content for each type of network. In the present invention, three MSC switching procedures are described corresponding to wired Internet, wireless Internet, and mobile telecommunication network. Hereinafter, these three MSC switching processes are described in detail with reference to FIGS. 8 to 10 . the

In step S604, the packets in the IP format converted in steps S602 and S603 are transmitted to the IP network. Then, the conversion of the terrestrial DMB content is terminated. the

FIG. 7 is a detailed flowchart illustrating a method for transforming the Fast Information Channel (FIC) of FIG. 6 . the

First, in step S701, the control information of the terrestrial DMB content is extracted in the FIC. the

In step S702, an SDP packet is generated based on the extracted control information and predetermined session information from the user terminal, because the session information required for the SDP packet includes not only FIC but also additional information. the

Next, a TCP/IP packet is generated by using the SDP packet in step S703. That is, the FIC conversion process S602 of FIG. 6 is terminated. the

FIG. 8 is a detailed flowchart illustrating a method for converting a main service channel (MSC) of FIG. 6 according to a first embodiment of the present invention. the

First, an RTP packet is generated based on the MSC in step S801. As described above, the size of the RTP packet is defined based on 8 bytes similarly to the terrestrial DMB content, and the payload type of the RTP packet can be judged by the type of the terrestrial DMB content. the

In step S802, UDP/IP packets are generated based on RTP packets. That is, the MSC switching process S603 of FIG. 6 required for accessing the wired Internet is terminated. the

FIG. 9 is a detailed flowchart illustrating a method for transforming an MSC according to a second embodiment of the present invention. the

First, in step S803, the MSC is demultiplexed into a DAB audio stream, a DAB data stream, and a multimedia stream. Then, in step S804, perform external decoding on the multimedia stream. the

In step S805, an RTP packet is generated based on the demultiplexed DAB audio stream and the demultiplexed DAB video stream in step S803 and the externally decoded multimedia stream in step S804. Here, the RTP packet is generated by considering the characteristics of the terrestrial DMB content transmission technology. the

In step S806, UDP/IP packets are generated based on RTP packets. That is, the MSC switching process S603 required for accessing the wireless Internet is terminated. the

FIG. 10 is a detailed flowchart illustrating a method for transforming an MSC according to a third embodiment of the present invention. the

First, as in step S803, the MSC is demultiplexed into a DAB audio stream, a DAB data stream, and a multimedia stream in step S807. Then, same as step S804, in step S808, perform external decoding on the multimedia stream. the

In step S809, the externally decoded multimedia stream is demultiplexed into a video transport stream (TS) and an audio transport stream (TS). Then, in step S810, a video elementary stream (ES) and an audio elementary stream (ES) are generated based on the video TS and the audio TS. the

In step S811, based on the demultiplexed DAB audio stream and the demultiplexed DAB video stream demultiplexed in step S807, and the video ES and audio ES generated in step S810, to generate RTP packets. In step S812, UDP/IP packets are generated based on RTP packets. That is, the MSC conversion process S603 required for accessing the mobile telecommunication network is terminated. the

Referring to FIGS. 8 to 10, MSCs including media information are decoded differently according to network characteristics (ie, stability and transmission bandwidth). Therefore, terrestrial DMB content can be efficiently transmitted to various IP networks. the

The above-mentioned method according to the present invention can be implemented as a program and stored on a computer-readable recording medium. The computer readable recording medium is any data storage device that can store data which can be read by a computer system. The computer-readable recording medium includes read-only memory (ROM), random-access memory (RAM), CD-ROM, floppy disk, hard disk, and magneto-optical disk. the

This application contains subject matter related to Korean Patent Application Nos. 2006-0061225 and 2006-0094380 filed with the Korean Intellectual Property Office on Jun. 30, 2006 and September 27, 2006, respectively, the entire contents of which are hereby incorporated by reference . the

Although the invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the invention as defined in the following claims. the

Claims (11)

1. A gateway for converting terrestrial digital multimedia broadcasting DMB content, comprising: The signal group transmission interface ETI demultiplexing part is used to divide the terrestrial DMB content with the ETI frame format into a fast information channel FIC and a main service channel MSC; A session description protocol SDP packet processing component is used to convert the FIC into an SDP packet; A Transmission Control Protocol/Internet Protocol TCP/IP packet generating component, configured to generate a TCP/IP packet based on the SDP packet; A real-time transport protocol RTP packet processing component is used to convert the MSC into an RTP packet; User Datagram Protocol/Internet Protocol UDP/IP packet generation unit for generating UDP/IP packets based on the RTP packet; and An IP output component is used to transmit the TCP/IP packet and UDP/IP packet through the IP network. 2. The gateway according to claim 1, wherein the RTP packet processing component comprises: The MSC demultiplexing block is used to demultiplex the MSC into DAB audio stream, DAB data stream and multimedia stream; an outer decoding block for performing outer decoding of the multimedia stream to thereby generate an outer decoded multimedia stream; and The RTP packet processing block is configured to form the RTP packet based on the DAB audio stream, the DAB data stream and the externally decoded multimedia stream. 3. The gateway according to claim 2, wherein the RTP packet processing block comprises: The multimedia stream analysis and demultiplexing unit is used for demultiplexing the externally decoded multimedia stream into video transport stream TS and audio TS by analyzing the externally decoded multimedia stream; an elementary stream ES generating unit, configured to receive the video TS and audio TS, and generate video ES and audio ES respectively; and An RTP packet processing unit for forming the RTP packet based on the DAB audio stream and DAB data stream from the MSC demultiplexing block and the video ES and audio ES from the ES generating unit. 4. The gateway according to claim 1, wherein the SDP packet processing section forms the SDP packet based on information included in the FIC and additional session information. 5. The gateway according to claim 1, wherein the SDP packet processing section forms the RTP packet having the same size as the terrestrial DMB content, and judges a payload type of the RTP packet as a terrestrial DMB content type. 6. A method for transforming terrestrial digital multimedia broadcasting DMB content, comprising the following steps: a) Demultiplexing terrestrial DMB content with Ensemble Transport Interface ETI frame format into Fast Information Channel FIC and Main Service Channel MSC; b) converting the FIC into a Session Description Protocol SDP packet, and generating a Transmission Control Protocol/Internet Protocol TCP/IP packet based on the SDP packet; c) converting the MSC into a Real-time Transport Protocol RTP packet and generating a User Datagram Protocol/Internet Protocol UDP/IP packet based on the RTP packet; and d) transmitting said TCP/IP packets and UDP/IP packets over an IP network. 7. The method of claim 6, wherein the SDP packet is formed based on information included in the FIC and additional session information. 8. The method according to claim 6, wherein step c) comprises the steps of: c1) demultiplexing the MSC into a DAB audio stream, a DAB data stream and a multimedia stream; c2) performing external decoding of the multimedia stream; c3) forming the RTP packet based on the DAB audio stream, the DAB data stream and the externally decoded multimedia stream; and c4) Generate the UDP/IP packet based on the RTP packet. 9. The method according to claim 8, wherein the step c3) comprises the steps of: c3-1) Demultiplexing the externally decoded multimedia stream into video transport stream TS and audio TS by analyzing the externally decoded multimedia stream; c3-2) Generate video elementary stream ES and audio ES by using video TS and audio TS, respectively; and c3-3) Form the RTP packet based on the DAB audio stream, DAB data stream, video ES and audio ES. 10. The method of claim 6, wherein the RTP packet and the terrestrial DMB content have the same size, and a payload type of the RTP packet is a terrestrial DMB content type. 11. A terrestrial digital multimedia broadcasting DMB content service system, comprising: An encoding component is used to encode a DAB audio source, a DAB data source and a multimedia source; Ensemble multiplexing means for multiplexing said encoded DAB audio, encoded DAB data and encoded multimedia into terrestrial DMB content based on the Ensemble Transport Interface ETI standard; The gateway is used to transform the terrestrial DMB content into a packet with an Internet Protocol IP format to access the IP network, or transmit the terrestrial DMB content to a coded orthogonal frequency division multiplexing (COFDM) encoding component for access to the dedicated terrestrial DMB net; and The COFDM encoding component is used to encode the terrestrial DMB content based on COFDM, and transmit the encoded terrestrial DMB content, Wherein the gateway demultiplexes the terrestrial DMB content into fast information channel FIC and main service channel MSC based on the ETI frame format, and converts the FIC into an IP format based on the session description protocol SDP and transmission control protocol/Internet protocol TCP/IP Packets, and convert MSC into packets with IP format based on RTP and UDP/IP.

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