KR100701900B1 - Relay system and digital multimedia broadcasting service providing method for digital multimedia broadcasting - Google Patents

Abstract

The present invention relates to a relay system for digital multimedia broadcasting and a method for providing digital multimedia broadcasting service.

In the relay system for digital multimedia broadcasting according to the present invention, the relay system for digital multimedia broadcasting includes a high speed information path for high speed information data signal, a service information path for service information signal, a digital radio audio frame path for audio service signal, Microwave digital with data path for data service signal, video service path for video service signal, main service multiplexer for converting signals from each path into unit frames, and transmission frame multiplexer for transmitting the unit frame as digital signals A broadcasting station for generating a terrestrial digital multimedia broadcasting signal including a radio broadcasting transmitter; A relay station including a signal conversion device for converting the digital multimedia broadcasting signal into an analog signal, a relay station amplifier for amplifying the signal from the signal conversion device, and a relay station transmitter for transmitting the analog signal amplified from the amplifier; And an exchange station disposed between the broadcast station and the relay station to supply the digital multimedia broadcast signal to the relay station and to control the relay station.

Description

Interface System For Digital Multi-Media Broadcasting And Service Providing Method Using The Same}

1 is a diagram schematically illustrating a relay system for multimedia broadcasting according to a first embodiment of the present invention.

FIG. 2 is a detailed block diagram illustrating a service signal generated in the broadcasting station of FIG. 1.

3 is a diagram illustrating the relay unit of FIG. 1.

4 is a diagram illustrating feedback and oscillation occurring in the relay unit of FIG. 1.

5 is a diagram schematically illustrating a relay system for multimedia broadcasting according to a second embodiment of the present invention.

6 is a block diagram illustrating in detail a service signal generated in the broadcasting station of FIG. 5.

FIG. 7 is a diagram illustrating the relay unit of FIG. 5. FIG.

8 is a block diagram showing in detail the relay station of FIG.

9 is a diagram schematically illustrating a relay system for multimedia broadcasting according to a third embodiment of the present invention.

10 is a diagram illustrating a relay station and an optical relay station of FIG. 9.

11 is a block diagram showing in detail the relay station of FIG.

12 is a block diagram showing in detail the optical relay station of FIG.

13 is a view showing a user receiving apparatus according to the first to third embodiments of the present invention.

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

100, 400, 700: broadcasting station 200, 500, 800: relay

300, 600, 900: User receiver

The present invention relates to mobile communication, and more particularly, to a relay system for digital multimedia broadcasting and a method for providing digital multimedia broadcasting service.

Conventional mobile communication is provided by forming a network by a mobile communication base station for transmitting and receiving a signal to and from a mobile communication terminal, and a mobile communication switching center for controlling the mobile communication base station.

Meanwhile, the communication service providing method is changing from a method of providing a one-way communication service to adding a customer's opinion and providing a two-way communication service capable of real-time customer selection. A new method for such a bidirectional communication service is called Digital Multimedia Broadcasting (hereinafter referred to as "DMB"), which is provided by using wireless data communication and mobile communication. These media are characterized by a bi-directional capability for receiving data, such as video and music, as well as requesting data.

Specifically, as DMB is digitizing voice broadcasting, conventional AM (Amplitude Modulation) and FM (Frequency Modulation) radio forms are provided with high quality CD (Compact Disk) level sound quality, and various data and video transmissions are provided. It is a next generation wireless broadcasting service that provides interactive services through. This DMB expanded the concept of 'listening broadcast' to 'viewing, listening and acting'.In addition to music broadcasting, various multimedia information such as news, traffic information, weather information, geographical location information, video information, etc. Can be sent. In addition, there is an advantage that can provide this multimedia information to the user anytime, anywhere. DMB broadcasting is excellent, and based on the characteristics of mobile reception, it is possible to deliver various contents such as music, text, and video through TV, portable and fixed terminals.

Such DMB broadcasting is called DAB (Digital Audio Broadcasting), DAR (Digital Audio Radio), DRB (Digital Radio Broadcasting), DSB (Digital Sound Broadcasting), etc. in the United States, Europe, and Canada. Was renamed DMB under the provisions of the International Telecommunication Union.

The difference between conventional broadcasting and DMB broadcasting is that conventional broadcasting transmits one program on one frequency, and DMB broadcasting broadcasts multiple programs including music, voice, video, and data on one frequency. .

DMB broadcasting can be watched through terrestrial and satellite broadcasting, and terrestrial DMB broadcasting in Korea is based on European-style Eureka-147. This method is an out-of-band method that enables a multimedia service using a new frequency band separate from the analog broadcast band. The out-of-band system uses a frequency other than the existing FM band, and broadcasts using an empty channel between analog TV channels in the VHS TV band. One channel has a bandwidth of 1.536 MHz, which carries several audio programs and data. The video compression method uses the same method as the Moving Picture Experts Group-4 (MPEG4) because the data is transmitted with the image. In addition, it simultaneously transmits PAD (Program Associated Data) service, which puts data together in a voice program, and independent program associated data (Non Program Associated Data), which provides programs in text, graphics, and screen independently regardless of the voice program. .

Satellite DMB broadcasting is a broadcasting system that enables mobile reception of voice and video through portable and vehicle terminals by using a stationary satellite or a non-satellite satellite of L band (1 ~ 2MHz) or S band (2 ~ 4MHz) frequency band. . Satellite DMB broadcasting requires a terrestrial repeater for a shadow area in which satellite signals are not received in addition to satellites for transmitting broadcast signals. There are five types of satellite DMB: system A, B, Dh, Ds, and E. The standard adopted by Korea is E. The E scheme has a frequency of 2.6 GHz and a bandwidth of up to 25 MHz. It is currently possible to provide 13 TV channels, and the number of channels provided when organizing channels mainly for video may be reduced.

Wireless data communication is typical of B-WLL (Broadband-Wireless Local Loop: hereinafter referred to as "B-WLL") and wireless LAN (Local Area Network: hereinafter referred to as "LAN").

The B-WLL method is a method of wirelessly providing a subscriber line within a distance of about 2 to 5 km from a base station. The B-WLL method is a high frequency short-range system that transmits data to a wireless transmitter near a subscriber using an optical cable and then distributes the data wirelessly. It uses the frequency band of 24 ~ 26GHz and allocates 500MHz and 1200MHz, respectively. Since the frequency band used in the B-WLL method is attenuated severely, the maximum transmit distance is generally limited to 3 to 5 km. The B-WLL method has a relatively low cost required for speed increase, superior quality compared to wireless, and easy prediction of the provided speed.

Wireless LAN (Wireless Local Area Network) refers to a wireless environment using a radio frequency technology to the end of the service provided to the user in the existing wired LAN environment. Since wireless LAN uses radio waves as a transmission medium, it is difficult to frequently move terminals or install wiring, or it is effective for short-term use.

The communication between the wireless LAN system and the terminal device uses an access point (hereinafter referred to as an "AP"), which has a similar role to a hub in a wired LAN, and communicates with the terminal device through an external antenna. Perform communication function. The transmission and reception radius of the AP is 20 ~ 500m, one AP can communicate with dozens of terminal devices.

 Mobile communication is typically IMT2000 (International Mobile Telecommunication 2000) using a CDMA (Code Dimension Multi Access) method. Data communication in mobile communication based on CDMA is based on IS-95B, which is an advanced standard based on IS-95 standard for high-speed wireless data transmission. I make it contents.

Mobile communication based on CDMA can be classified into CDMA2000 1x, 1x EVDO, 1x EVDV, and CDMA 2000 3x by technical characteristics.

First, CDMA2000 1x, like the IS95A / B, uses a bandwidth of 1.25 MHz and is a packet method that supports an average transmission speed of 144 Kbps. It is applicable to both voice and data traffic and maintains compatibility with existing mobile communication systems.

1x EVDO is a data-only network that enhances the data communication function in the mobile communication system to improve the quality of data transmission and reception. It supports data transmission capacity of up to 2.4Mbps in forward, 621Kbps in average, and 307.2Kbps in reverse. 1x EVDO is applied only to data, and voice communication is a method using an existing mobile communication system. This is a concept of allocating and extending the spare RF (Radio Frequency) frequency of the IS-95A / B system being used as a reference, and using the existing antenna as it is.

1x EVDV has a maximum data transfer capacity of 5.2Mbps and an average data transfer capacity of 1.2Mbps, which can be applied to both voice and data. In addition, the 1x EVDV may be implemented by upgrading the IMT2000 1x (CDMA2000 1x) system. Not only is 1x EVDV more efficient than other systems, but subscribers can use high-speed data services while maintaining the same communication quality anywhere in the base station.

CDMA2000 3x supports data transfer capacity of up to 2.1Mbps, average 1Mbps, and it can be applied to both voice and data communication, and the bandwidth required for one channel allocation is 5MHz, enabling multimedia service in wireless environment. In addition, it is possible to interwork with the existing CDMA switch.

Such wireless Internet, mobile communication systems and DMB systems can provide additional information along with high-quality digitized video, audio, and images to users on the move or remotely. In addition, the characteristics of two-way communication such media has the advantage that the user can participate in the relay of various services, games.

In order to provide various services using such a DMB system, development of a relay system of various methods connecting a broadcasting station and a user is required.

Accordingly, an object of the present invention is to provide a relay system and a method for providing a DMB service to prevent oscillation due to feedback in transmitting a terrestrial DMB signal and to provide a stable and reliable terrestrial DMB service.

In order to achieve the above object, a relay system for a DMB according to an embodiment of the present invention is a high-speed information path for the high-speed information data signal, a service information path for the service information signal, a digital radio audio frame path for the audio service signal, Microwave digital with data path for data service signal, video service path for video service signal, main service multiplexer for converting signals from each path into unit frames, and transmission frame multiplexer for transmitting the unit frame as digital signals A station for generating a terrestrial DMB signal, including a radio broadcast transmitter; A relay station including a signal conversion device for converting the DMB signal into an analog signal, a relay station amplifier for amplifying the signal from the signal conversion device, and a relay station transmitter for transmitting the analog signal amplified from the amplifier; And an exchange station disposed between the broadcasting station and the relay station to supply the DMB signal to the relay station and to control the relay station.
The relay station is located in a mobile communication base station.
The relay station further includes an all-optical converter for converting the analog signal into an optical signal.
The RS transmits the optical signal through an optical cable together with an optical signal of a mobile communication base station using an optical wavelength division multiplexing scheme.
The relay system includes a photoelectric conversion device that receives the optical signal and converts it into the analog signal, an optical relay station amplifier that amplifies the signal from the photoelectric conversion device, and an optical relay station that transmits the analog signal amplified from the amplifier. The branch further includes an optical relay station.
The optical relay station is located in a mobile communication optical relay station.
The optical relay station receives a signal by sharing an optical cable between the mobile communication base station and the optical relay station.
The switching center is located at the mobile communication switching center.
The switching center transmits a DMB signal to the relay station by using a broadcasting function of a dedicated line.
The relay system further includes a user receiver for receiving an analog signal from the relay station.
The user receiver is any one of a portable terminal, a PDA, a notebook, and a radio.
DMB service providing method according to an embodiment of the present invention comprises the steps of generating at least one of a data service signal, an audio signal, a video signal, a service information signal, a high-speed information data signal, converting the signals into a unit frame, Generating a terrestrial DMB signal from a broadcasting station including converting the unit frame into a digital signal; Transmitting the DMB signal to a relay station; And converting and amplifying the DMB signal into an analog signal using a signal conversion device in the relay station. And transmitting the analog signal to a user receiver.
The DMB service providing method includes converting the analog signal into an optical signal using an all-optical converter; And receiving the optical signal and restoring the analog signal by using a photoelectric conversion device.

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Hereinafter, with reference to Figures 1 to 13 attached to the preferred embodiments of the present invention will be described in detail.

1 is a diagram schematically showing a terrestrial DMB signal transmission method according to a first embodiment of the present invention.

Referring to FIG. 1, the terrestrial DMB signal transmission method according to the first embodiment of the present invention includes a broadcasting station 100 for generating a signal to be transmitted to a user, for example, video, audio, data, and the like. The relay unit 200 for relaying the analog signal of the relay unit 200 and the user receiving apparatus 300 for receiving a signal from the broadcasting station 100.

The broadcasting station 100 generates and transmits a terrestrial DMB signal. 2, the broadcasting station 100 transmits a multi-control data signal, a high-speed information data (FIC) signal, a service information signal, an audio signal, a data signal, and a video signal, respectively. Supplies). Here, the microwave digital radio broadcast transmitter 199 includes a high speed information path 110 for a high speed information data signal, a service information path 120 for a service information signal, a digital radio audio frame path 130 for an audio service signal, A data path 140 for the data service signal and a video service path 150 for the video service signal, the signals passing through each path being supplied to the main service multiplexer 160, and the main service multiplexer 160 Supplies each signal to the transmission frame multiplexer 170 in the form of unit frames (CIFs). In addition, the signal passing through the high-speed information data path 110 is supplied directly to the transmission frame multiplexer 170. The transport frame multiplexer 170 receiving each service signal supplies the digital signal to the OFDM signal generator 180 according to the MPEG2-TS scheme.

The video service signal adopts the MPEG 4 scheme, and is supplied to the microwave digital radio broadcast transmitter 199 in a stream mode via the video multiplexer 190. Subsequently, the main service multiplexer 160 passes through the selective reception limit scrambling unit 192, the energy distribution scrambling unit 194, the convolutional encoder 196, and the time interleaver 198. To be supplied. In addition, the selective reception scrambling unit 192 to which the video service signal is supplied can selectively receive and limit the service signal supplied to each path. In addition, the convolutional encoder 196 convolutionally encodes a video service signal that has passed through the energy distribution scrubber 194 with a signal supplied to each path and supplies it to the time interleaver 198.

The transport frame multiplexer 170 converts signals passing through the high-speed information data path 110 and unit frames (CIFs) supplied from the main service multiplexer 160 into an MPEG2-TS scheme and supplies them to the OFDM signal generator 180. do. Here, the MPEG2-TS scheme generated from the transmission frame multiplexer 170 is a digital signal, and the OFDM signal generator 180 converts the signal from the transmission frame multiplexer 170 into an analog signal to relay the user 200 and the user. It is transmitted to the receiver 300. The MPEG2-TS system is the standard for terrestrial DMB broadcasting signals in Korea, and its transmission rate is based on "E1". In addition, the OFDM signal generator 180 is a frequency transmission method according to a transmission signal method for terrestrial DMB broadcasting in Korea.

Here, the signal transmitted through the microwave digital radio broadcast transmitter 199 of the broadcasting station 100 is an analog signal of the OFDM scheme.

As illustrated in FIG. 3, the relay unit 200 is positioned between the broadcasting station 100 and the user receiving apparatus 300 to supply a signal from the broadcasting station 100 to the user receiving apparatus 300. Here, the relay unit 200 transmits the relay receiver 210 for receiving a signal propagated from the outside, the amplifier 220 for amplifying the signal received at the relay receiver 210, and the signal of the amplifier 220 again. It is provided with a relay transmitter 230.

The antenna direction of the relay receiver 210 is set to a direction corresponding to the signal transmission direction of the broadcast station 100 so as to receive an analog signal transmitted from the broadcast station 100 well.

The amplifier 220 amplifies the analog signal received from the relay receiver 210 and supplies it to the relay transmitter 230. Here, the amplification degree of the amplifier 220 is set by the designer according to the signal processing amount assigned to the relay unit 200 and environmental factors such as signal attenuation and power attenuation according to the surrounding environment.

The relay transmitter 230 supplies the analog signal amplified from the amplifier 220 to the receiver 300 of the user.

In the terrestrial DMB signal transmission method according to the first embodiment of the present invention having such a structure, various signals generated by a broadcasting station supply a DMB service to a user through a microwave digital radio broadcast transmitter 199 and a relay unit 200. . However, in the terrestrial DMB signal transmission method according to the first embodiment of the present invention, oscillation due to feedback occurs between the relay transmitter 230 and the relay receiver 210, so that the relay unit 200 is totally down or substantially no signal is supplied. A phenomenon that cannot be performed occurs. 4, the MPEG2-TS digital signal from the transmission frame multiplexer 170 of the broadcasting station 100 is converted into an analog signal through the OFDM signal generator 180 and then radiated into the air. The relay unit 200 is to be supplied. That is, the analog signal received by the relay receiver 210 is amplified through the amplifier 220 and then transmitted to the relay transmitter 230 again. In this case, isolation between the relay receiver 210 and the relay transmitter 230 is shown. If is less than the amplification degree of the amplifier 220, a feedback phenomenon occurs that the signal transmitted from the relay transmitter 230 is received as an input to its relay receiver 210. As a result, an oscillation phenomenon in which its own signal transmitted from the relay transmitter 230 is repeatedly amplified by the amplifier 220 occurs, thereby causing the relay unit 200 to shut down or fail to perform a substantial signal relay. In order to solve this problem, various methods have been sought to increase the isolation degree to amplification degree such as installing the relay receiver 210 close to the ground or laying it underground, but such a method safely receives a signal from the broadcasting station 100. In the end, there is a problem that can not provide a stable service. Accordingly, the terrestrial DMB signal transmission method according to the second embodiment of the present invention solves the oscillation problem of the signal transmission method according to the first embodiment of the present invention, and provides a method for more efficiently managing the relay system. Let's do it.

5 is a diagram schematically illustrating a terrestrial DMB signal transmission method according to a second embodiment of the present invention.

Referring to FIG. 5, the terrestrial DMB signal transmission method according to the second embodiment of the present invention provides a broadcasting station 400 for generating a signal to be transmitted to a user, for example, video, audio, data, and the like. The relay unit 500 for relaying a digital signal and converting the signal into an analog signal includes a relay unit 500 and a user receiver 600 for receiving a signal from the broadcast station 400.

Here, in the transmission method of the terrestrial DMB signal according to the second embodiment of the present invention, the broadcasting station 400 compares with the broadcasting station 100 in the transmission method of the terrestrial DMB signal according to the first embodiment of the present invention. Since the OFDM signal generator 180 formed in the broadcast transmitter 199 has the same configuration except that the description is omitted.

The broadcasting station 400 according to the second embodiment of the present invention generates and transmits a terrestrial DMB signal. Referring to FIG. 6, the broadcasting station 400 transmits a multi-control data signal, a high-speed information data (FIC) signal, a service information signal, an audio signal, a data signal, and a video signal, respectively. Supplies). Here, the microwave digital radio broadcast transmitter 499 includes a high speed information path 410 for a high speed information data signal, a service information path 420 for a service information signal, a digital radio audio frame path 430 for an audio service signal, A data path 440 for the data service signal, a video service path 450 for the video service signal, and signals passing through each path are supplied to the main service multiplexer 460, and the main service multiplexer 460. Supplies each signal to the transmission frame multiplexer 470 in the form of unit frames (CIFs). In addition, the signal passing through the high-speed information data path is directly supplied to the transmission frame multiplexer 470. That is, the signal transmitted from the broadcasting station 400 is a digital signal of MPEG2-TS type transmitted from the transmission frame multiplexer 470.

The relay unit 500 is disposed between the relay station 550 for supplying a signal received from the broadcast station 400 to the user receiver 600, and the broadcast station 400 and the relay station 550, as shown in FIG. By providing the switching station 540 for supplying the DMB signal to the relay station 550, a dedicated network is constructed. Here, the relay station 550 may be installed in an existing mobile communication base station.

The exchange station 540 receives the MPEG2-TS digital signal from the broadcast station 400, supplies the digital signal to each relay station 550, and controls each relay station 550. This switching center 540 may be installed in the existing mobile communication switching center 540.

Each relay station 550 converts the MPEG2-TS type digital signal transmitted from the switching station 540 into the OFDM type analog signal using the OFDM signal generator 554, as shown in FIG. To 600. Specifically, each relay station 550 includes an OFDM signal generator 552 for converting a digital signal of the MPEG2-TS scheme transmitted from the switching center 540 into an analog signal of the OFDM scheme, and an OFDM signal generator 552 as necessary. An amplifier 554 for amplifying the analog signal from the sig- nal), an OFDM signal generator 552, and a relay station transmitter 556 for transmitting the analog signal amplified from the amplifier 554 to the user receiver 600.

In the terrestrial DMB signal transmission method according to the second embodiment of the present invention as described above, the digital signal of the MPEG2-TS method is supplied from the broadcasting station 400 to the relay station 550, and thus, the first method of the present invention. Oscillation occurring in the terrestrial DMB signal transmission method according to the embodiment does not occur. Accordingly, the signal from the broadcasting station 400 can be stably and reliably supplied to the user receiving apparatus 600 via the relay station 550. Here, in the terrestrial DMB signal transmission method according to the second embodiment of the present invention, when amplification of a signal is required between the broadcasting station 400, the switching station 540, and the relay station 550, the transmitted signal is a digital signal. A separate digital amplifier can be provided for amplification. In addition, the relay station 550 and the switching station 540 according to the second embodiment of the present invention may be installed in the existing mobile communication base station and mobile communication switching station, respectively.

9 is a diagram schematically illustrating a terrestrial DMB signal transmission method according to a third embodiment of the present invention.

Referring to FIG. 9, the terrestrial DMB signal transmission method according to the third embodiment of the present invention provides a broadcasting station 700 for generating a signal to be transmitted to a user, for example, video, audio, data, and the like. A relay unit 800 which relays digital signals and converts them into analog signals and optical signals, and a user receiver 900 for receiving signals from the relay unit 800 and the broadcasting station 700 are provided.

The terrestrial DMB signal transmission method according to the third embodiment of the present invention has the same configuration except for the relay unit 800 as compared to the terrestrial DMB signal transmission method according to the second embodiment of the present invention. Descriptions other than those will be omitted.

The relay unit 800 according to the third embodiment of the present invention includes a relay station 800A which receives a signal from the broadcasting station 700 and supplies the signal to the user receiving apparatus 900 as shown in FIG. 10, and the relay station 800A. And an optical relay station 800B for receiving a signal from the relay station 800A and supplying the signal to the user receiver 900.

The relay station 800A receives a signal transmitted from the broadcast station 700, converts and amplifies the received signal, and supplies the relay station 850 to the user receiver 900, between the relay station 850 and the broadcast station 700. And an exchange station 840 disposed to control relay station 850.

The relay station 850 includes an OFDM signal generator 852 and an OFDM signal generator 852 for converting a digital signal of the MPEG2-TS system transmitted from the broadcasting station 700 into an analog signal of the OFDM scheme as shown in FIG. A relay station amplifier 854 for amplifying an analog signal of the OFDM scheme, a relay station transmitter 856 for amplifying the signal amplified by the relay station amplifier 854, and supplying it to the user receiver 900, and a relay station amplifier 854 An all-optical converter 858 for converting the analog signal amplified by the optical signal into an optical signal is provided. Here, the all-optical conversion device 858 is connected between the OFDM signal generator 852 and the relay station amplifier 854 so that an analog signal of the OFDM scheme from the OFDM signal generator 852 is not amplified by the relay station amplifier 856 without being amplified. Can be supplied at 800B. Here, the relay station 800B converts and supplies an optical signal supplied to the optical relay station 800B by using an optical wavelength division multiplexing method.

As shown in FIG. 12, the optical relay station 800B converts an optical signal supplied from an all-optical converter 857 of the relay station 850 using a dedicated line, for example, an optical cable, into an analog signal. And the optical relay station 864 connected to the photoelectric conversion device 862 to amplify the analog signal from the photoelectric conversion device 862 and the analog signal amplified by the optical relay station 864 to the user receiver 900. An optical relay station transmitter 866 is transmitted to the transmitter. Here, the signal transmitted by the optical relay station 866 is an analog signal of the OFDM method.

In the terrestrial DMB signal transmission method according to the third embodiment of the present invention, an all-optical change device 857 is provided at the relay station 850 to convert the terrestrial DMB signal into an optical signal and then supply the optical signal to the optical relay station 800B. As a result, a network may be formed in connection with the optical relay station 800B. The optical relay station 800B can use an existing mobile communication optical relay station 800B.

As a result, the terrestrial DMB signal transmission method according to the second and third embodiments of the present invention does not need to separately rent a local to form a relay network for terrestrial DMB signal transmission. Not only can the network be formed using the switching station and the existing mobile communication optical relay station, but the terrestrial DMB signal relay network can be formed without oscillation of the base station.

Meanwhile, the user receivers 300, 600, and 900 according to the first to third embodiments of the present invention are OFDM receivers 980 capable of receiving an analog signal of OFDM scheme, which is a terrestrial DMB signal, as shown in FIG. And a playback device 990 for reproducing the selected signal requested by the user among the signals received by the OFDM receiver 980.

The OFDM receiver 980 is manufactured to receive a signal transmitted from an OFDM signal generator, and the form of the OFDM signal follows the terrestrial DMB service standard.

The reproducing apparatus 980 is a device capable of reproducing various service signals transmitted from a broadcasting station, and may provide an integrated service capable of reproducing all signals produced by the broadcasting station. For example, the playback device 980 includes any one of a portable terminal, a PDA, a notebook computer, and a radio. The playback device 980 transmits at least one of an audio, video, and data signal from a broadcasting station to the terrestrial DMB service. Can be received and played at "E1" speed.

As described above, the relay system for digital multimedia broadcasting and the method for providing digital multimedia broadcasting service according to the present invention can prevent oscillation due to feedback and provide a stable and reliable service, unlike the analog relay system. By using existing mobile communication switching centers and base stations, there is no need to build a relay system for terrestrial DMB services. In addition, by forming a relay network using the existing mobile communication base station and the photoelectric conversion apparatus and cable of the optical relay station can provide services to more users requesting the terrestrial DMB service.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (18)

High speed information path for high speed information data signal, service information path for service information signal, digital radio audio frame path for audio service signal, data path for data service signal, video service path for video service signal, each path A broadcast station for generating a terrestrial digital multimedia broadcasting signal, including a microwave digital radio broadcasting transmitter having a main service multiplexer for converting a signal from the unit frame into a unit frame, and a transmission frame multiplexer for transmitting the unit frame as a digital signal; A relay station including a signal conversion device for converting the digital multimedia broadcasting signal into an analog signal, a relay station amplifier for amplifying the signal from the signal conversion device, and a relay station transmitter for transmitting the analog signal amplified from the amplifier; And And a switching station arranged between the broadcasting station and the relay station to supply the digital multimedia broadcasting signal to the relay station and to control the relay station. The method of claim 1, The relay station is a relay system for digital multimedia broadcasting, characterized in that located in the mobile communication base station. The method of claim 2, The relay station And an all-optical converter for converting the analog signal into an optical signal. delete The method of claim 1, The relay station And transmitting the optical signal through an optical cable together with an optical signal of a mobile communication base station by using an optical wavelength division multiplexing method. The method of claim 1, A photoelectric conversion device for receiving the optical signal and converting the optical signal into an analog signal; An optical relay station for amplifying a signal from the photoelectric conversion device; And an optical relay station having an optical relay station transmitter for transmitting an analog signal amplified from the amplifier. The method of claim 6, The optical relay station Relay system for digital multimedia broadcasting, characterized in that located in the mobile communication optical relay station. The method of claim 7, wherein The optical relay station Relay system for digital multimedia broadcasting, characterized in that the signal is received by sharing the optical cable between the mobile communication base station and the optical relay station delete The method of claim 1, The exchange office Relay system for digital multimedia broadcasting, characterized in that located in the mobile communication switching center. The method of claim 1, The exchange office And a digital multimedia broadcasting signal to the relay station by using a broadcasting function of a dedicated line. delete The method of claim 1, And a user receiver for receiving an analog signal from the relay station. The method of claim 13, The user receiver is Relay system for digital multimedia broadcasting, characterized in that any one of a portable terminal, PDA, notebook, radio. Generating at least one of a data service signal, an audio signal, a video signal, a service information signal, and a high-speed information data signal; converting the signals into a unit frame; and converting the unit frame into a digital signal. Generating a terrestrial digital multimedia broadcasting signal from a broadcasting station; Transmitting the digital multimedia broadcasting signal to a relay station; Converting and amplifying the digital multimedia broadcasting signal into an analog signal using a signal conversion device in the relay station; And And transmitting the analog signal to a user receiver. delete delete The method of claim 15, Converting the analog signal into an optical signal using an all-optical converter; And And receiving the optical signal by using a photoelectric conversion device and restoring the analog signal to the analog signal.

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