KR100271939B1 - Mmds/lmds hybrid transmission system - Google Patents

Abstract

PURPOSE: MMDS/LMDS hybrid transmission syste is provided to make MMDS/LMDS hybrid wireless transmission network by using a merit of MMDS and LMDS, and simultaneously services a wide area by sharing an expensive head-end device. CONSTITUTION: A head-end(30) digitally encodes a program information/data information every corresponding channel, and digitally modulates the same. MMDS/LMDS transmitter(40) receives a digital information signal from the head-end through a wire or wireless network, converts the digital information signal to a corresponding frequency band by using an MMDS(multichannel multipoint distribution service) transmitter or LMDS(local multipoint distribution service) transmitter, and simultaneously transmits MMDS microwave signal and LMDS microsave signal. LMDS transmitter receives an LMDS microwave signal from the MMDS/LMDS transmitter.

Description

MDS / LMDS hybrid transmission system {MMDS / LMDS hybrid transmission system}

The present invention relates to a wireless transmission network, and more particularly, to a wireless transmission system for transmitting information using microwave frequency signals to a plurality of remote points far from one common point. More particularly, the present invention relates to a system for digitally communicating with a broadcast by combining a multi-channel multipoint distribution service (MMDS) and a local multipoint distribution service (LMDS), which are wireless access methods. will be.

The traditional method of broadcasting the same information or message from any place to several places, such as television program broadcasting, is achieved by broadcasting broadcasts from the central antenna of a broadcasting station to a plurality of roof antennas within a transmission tower radius. In order to solve the radio shade area during wireless broadcasting, a cable TV (CATV) network has been developed that provides a broadcast signal through a wire by directly connecting a cable between subscriber TVs. However, such a wired TV network is difficult to install or change subscriber lines, and installation cost is also very expensive, and maintenance, repair and management are also expensive and difficult.

Recently, with the development of wireless communication technology, wireless wired TV (hereinafter referred to as wireless CATV) system is being developed or commercialized.

The concept of the wireless CATV service network is briefly described. When a pay information signal is scrambled by a signal combiner from information sources such as information through broadcasting stations or satellites and various programs, up-modulated and transmitted by microwave through a frequency upconverter, It is received by the rooftop microwave antenna on the subscriber side through the transmission antenna installed on the top of the mountain and descrambled according to the VHF / UHF frequency using the frequency downconverter and then received by the TV receiver.

MMDS and LMDS methods have been largely proposed for the wireless CATV transmission method.

MMDS is suitable for one-way broadcasting service and the available frequency band of 2.5 GHz is suitable for small local broadcasting. Since MMDS uses 2.535 ~ 2.655㎓ (200MHz bandwidth) in Korea, it can transmit 20 channels in case of TV channel using 6MHz as one channel, and it can be increased by applying video compression technology. MMDS systems are now commercially available in many countries around the world and are less expensive than LMDS systems. However, the bandwidth of the MMDS is somewhat limited, so it cannot provide a service requiring a wider bandwidth and can only provide one-way transmission.

LMDS, which has emerged as a wireless system that can solve the shortcomings of MMDS, is suitable for two-way broadcasting and telecommunication service and uses 28 ㎓ (1 ~ 3 ㎓) band as a frequency band. It is considered the most appropriate way for multimedia. Domestic LMDS also uses high frequency of 26.7 ~ 27.5 ㎓ band (bandwidth 800MHz), so it can be composed of dozens of channels by analog method and hundreds of channels by digital compression, which is the most economical in terms of transmission capacity. Although a two-way transmission service of the program request is possible, it has not been commercialized yet. In addition, LMDS requires more installation cost than MMDS, but it is inexpensive compared to wire, and because of high frequency, the service radius is narrow to 5km, and it is weak to obstacles.

On the other hand, in urban and rural areas, it is difficult to install the whole area by wire transmission network, and it is difficult to install or change the equipment, and it is not economical in terms of cost. There is a problem that can not provide a broadcast service.

Accordingly, the present invention has been made to solve the above problems and to meet the need, adopting only the advantages of MMDS and LMDS to configure the MMDS / LMDS composite wireless transmission network, and share a single expensive head-end equipment Its purpose is to serve large areas simultaneously as headends.

Another object of the present invention is to configure a digital / analog combined wireless transmission network that simultaneously supports analog modulation and digital modulation.

It is still another object of the present invention to provide a wired / wireless hybrid network which separately includes a wireless relay network formed wirelessly from the head end and a wired relay network formed by wires from the head end, and transmits radio broadcasting waves from the wireless relay network or the wired relay network to the subscriber antenna. Its purpose is to construct.

In order to achieve the above object, the MMDS / LMDS complex transmission system of the present invention comprises: a headend for digitally encoding and digitally modulating program information / data information for each channel; Receives digital information signal transmitted from the headend through a wired or wireless network and converts it to a corresponding frequency band by using a multi-channel multi-distribution service (MMDS) transmitter or a local multipoint multi-point distribution service (LMDS) transmitter to simultaneously convert the MMDS MMDS / LMDS transmission means for transmitting a microwave signal and an LMDS microwave signal; And LMDS transmission means for receiving and relaying LMDS microwave signals transmitted from the MMDS / LMDS transmission means.

The present invention further includes an MMDS transmission means for receiving a digital information signal transmitted from the headend through a wired or wireless network and up-converting using a multi-channel multi-distribution service (MMDS) transmitter to transmit an MMDS microwave signal. It features.

The present invention is characterized in that it further comprises a subscriber side receiving means for receiving the signal transmitted from the MMDS / LMDS transmission means, or the LMDS transmission means, or the MMDS transmission means down-converted and reproduced.

The MMDS / LMDS complex transmission system of the present invention for achieving the above another object comprises a means for digitally processing program information / data information for each channel and an analog processing for each channel, thereby providing a plurality of digitally processed channel signals. And a headend configured to combine a plurality of analog processed channel signals to transmit selectively or simultaneously through a wired or wireless path. MMDS / LMDS transmission means for up-modulating the analog channel signal of the headend to the MMDS frequency band and for converting the digital channel signal to the LMDS frequency band selectively or simultaneously; LMDS transmission means for receiving and relaying the LMDS microwave signal transmitted from the MMDS / LMDS transmission means; And subscriber side receiving means for receiving the microwave signal transmitted from the MMDS / LMDS transmission means or from the LMDS transmission means and down-converting and reproducing it.

1 is a block diagram of an MMDS / LMDS composite wireless CATV network according to the present invention

FIG. 2 is a diagram illustrating an arrangement and service area of a transmission facility of the MMDS / LMDS hybrid wireless CATV network of FIG.

3 is a block diagram of a transmission facility using the optical cable of FIG.

4a and 4b is a configuration diagram of the in-band trunking transmission equipment of FIG.

5 is a view for explaining the concept of the signal vendor transmission equipment of FIG.

6 is a block diagram of the head end of FIG.

7 is a block diagram of a subscriber-side system of FIG.

8 is a CATV transmission network configuration employing the MMDS / LMDS hybrid scheme according to an embodiment of the present invention

9 is a configuration diagram of a CATV transmission network employing a digital / analog combined wireless method according to an embodiment of the present invention

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

30: Headend Equipment 40: MMDS / LMDS Transmission Tower

50, 61: subscriber receiving antenna 60: LMDS transmission tower

200: MMDS main transmission tower 210,211,212: LMDS main transmission tower

240,241,242: MMDS Signal Vendor System

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an MMDS / LMDS composite wireless CATV network according to an embodiment of the present invention. This embodiment consists of a composite wireless CATV transmission network supporting both digital MMDS and digital LMDS schemes.

In FIG. 1, the composite wireless CATV transmission network is connected to the optical cable transmission path between the headend 30 and the MMDS / LMDS composite transmission antenna 40, and between the MMDS / LMDS composite transmission antenna 40 and the subscriber side receiving antenna 50. Or a microwave link between the LMDS transmission tower antenna 60 is connected to the subscriber TV (51) (62) or the wireless cable modem (52) (63).

The head end 30 receives the Internet information and the high-speed data signal from the SO 10 through a CATV program or a backbone communication network such as the BISDN 20, encodes and modulates the corresponding channel, and transmits the MMDS / LMDS composite transmission antenna through an optical cable. 40).

The MMDS / LMDS composite transmission antenna 40 transmits the received information signal by modulating the received information signal to the MMDS transmission frequency or the LMDS transmission frequency according to a corresponding wireless distribution scheme. For example, in the case of MMDS: the transmission frequency is 2.535 ~ 2.655 ㎓, the transmission method is QAM, the transmission output is 2 ~ 100W, the number of channels is 40 channels (at 60MHz), and the service radius is up to 35km. In case of LMDS method: transmission frequency is 26.7 ~ 27.5㎓, transmission method is QAM, transmission output is 6.3W, the number of channels is 533 channels (when using 800MHz), and service radius is up to 2 ~ 5km. can do.

Then, the MMDS frequency signal 100 transmitted from the MMDS / LMDS transmission antenna 40 is received and down-converted through the subscriber side receiving antenna 50 within the MMDS service range, and the resulting video and audio signals are converted into subscriber TV ( 51, and the high speed data signal is demodulated into a digital signal via the wireless cable modem 52 and displayed on the computer 53.

In addition, the LMDS frequency signal 110 transmitted from the MMDS / LMDS transmission antenna 40 is received by the LMDS transmission tower antenna 60 and relayed and down-converted to the subscriber-side reception antenna 61 within a corresponding service range. The resulting video and audio signals are reproduced on the subscriber TV 62, and the high speed data signals are demodulated into digital signals via the wireless cable modem 63 and displayed on a computer or the like.

In addition, the LMDS may provide an interactive service that transmits a request message from the subscriber side to the service provider side along the uplink radio path 120.

The overall configuration of the digital MMDS / LMDS transmission system of the present invention is largely composed of the head-end equipment, MMDS / LMDS complex transmission equipment, repeaters and subscriber receiver equipment. It may include a digital transmission system using a wired cable to accommodate the existing wired cable service. Such a wired digital transmission system can provide for subscribers in the shaded areas of urban areas.

FIG. 2 is a diagram illustrating an arrangement and service area of a transmission facility of the MMDS / LMDS hybrid wireless CATV network of FIG. 1.

An optical cable is connected between the MMDS main transmission tower 200 located in the center of the MMDS service area and a plurality of LMDS main transmission towers 210, 211 and 212 serving each cell unit. In addition, the MMDS main transmission tower 200 and some of the plurality of LMDS main transmission towers 220 and 221 serving in each cell unit are connected by using in-band trunking facilities. The shaded areas 230, 231 and 232 present behind the high buildings or high mountains in the service area within a radius of 50 to 60 km from the MMDS main transmission tower 200 are the MMDS signal vendor system 240 and 241. The service is provided by 242.

Hereinafter, various transmission facilities required for the present transmission network will be described with reference to FIGS. 3 to 5.

3 is a configuration diagram of a transmission facility using the optical cable of FIG. 2, and shows an optical cable transmission facility between the MMDS main transmission tower 200 and the LMDS main transmission tower 210.

The headend equipment room 300 located in the cable broadcasting station is equipped with a headend 310, an LMDS transmitter 320, and a wired transmitter 390. The MMDS installed in the MMDS main transmission tower 200 located at a high mountain top is provided. The transmitter 360 and the head end 310 are connected by an optical cable. The transmission of the short section from the head end 310 to the MMDS main transmission tower 200 may be used by renting an optical cable provided by the infrastructure provider.

The MMDS transmitter 360 up-converts the VHF signal transmitted from the head end 310 to the optical cable to the MMDS band and supplies it to the omni-directional transmission antenna 370, and the LMDS transmitter 330 is coaxial or at the head end 310. The VHF / UHF signal transmitted by the optical cable is upconverted to the LMDS band and supplied to the LMDS sector antenna 330. Here, the optical transmission interface 340 and the optical reception interface 350 are connection devices for connecting an optical cable from the head end 310 to the MMDS transmitter 360. The optical transmission interface 340 is a device for transmitting an MPEG-2 encoded and QAM modulated signal from the headend 310 to an optical receiver (not shown) through an OC-3 optical link. The optical reception interface 350 is a device that receives a signal transmitted through the OC-3 optical link and restores a signal suitable for an input terminal of the MMDS transmitter 360. The OC-3 optical link is an optical cable link connecting the 155 Mbps optical transmission interface and the optical reception interface.

The MMDS omni directional antenna 370 transmits the MMDS signal supplied from the MMDS transmitter 360 and the LMDS sector antenna 330 transmits the LMDS signal supplied from the LMDS transmitter 320 to the subscriber receiving antenna (not shown).

In addition to the wireless relay network as described above, the signal transmitted from the headend 310 is modulated by the wired transmitter 390 to provide a service by the existing wired network.

Unexplained 380 is an in-band trunking transmit antenna to be described in FIG. 4B.

The MMDS in-band trunking system is shown in FIG. 4A because the distance between the LMDS cells and the cells between the cities within the integrated cable broadcasting area is too long, and also because the usage cost is too high when transmitting from the initial installation to the optical cable. Can be installed as In other words, the LMDS cell in the city A region and the LMDS cell in the city B 10 to 40 km away from each other using the in-band trunking system instead of the optical cable.

Referring to FIG. 4B, a method of connecting a cell with an LMDS cell using a 2.5 kHz MMDS in-band trunking system will be described.

The in-band trunking system 220-1 provided in the relay tower in the LMDS cell of the urban area A, and the in-band trunking system 220-2 provided in the relay tower in the LMDS cell of the city B area are shown. Each in-band trunking system 220-1 and 200-2 includes a high performance receive antenna 400, 410, a receiver 401, 411, a transmitter 402, 412, an in-band trunking transmit antenna 403. 413 and transmit antennas 404 and 414.

The high performance reception antenna 400 has a parabola shape, receives a signal transmitted from the in-band trunking transmission antenna 380 of the MMDS main transmission tower 200, and supplies the received signal to the receiver 401. The receiver 401 down-converts the received signal supplied from the receiving antenna 400 to the VHF band 140 to 260 MHz for supplying the relay transmitter 402. The transmitter 402 upconverts the VHF band signal supplied from the receiver 401 to 26.7-27.5 kHz (LMDS band signal). The inband trunking transmit antenna 403 transmits the signal supplied from the transmitter 402 to another inband trunking system 220-2. The transmit antenna 404 is an apparatus for transmitting a signal supplied from the transmitter 402 to a subscriber (or signal vendor system), and uses an antenna selectable within a range of 15 degrees to 180 degrees.

In addition, in other embodiments, the interconnection between LMDS cells may be converted to optical cables instead of in-band trunking systems.

5 is a view for explaining the concept of the signal vendor transmission equipment of FIG.

The signal transmitted from the MMDS transmission tower 200 or the LMDS transmission tower is received through the directional reception antenna 500, amplified through the signal vendor amplifier 510 and then supplied to the directional transmission antenna 520. The directional transmission antenna 520 is a device for re-transmission with directivity in the shadow area to determine the reception range (within 15 degrees to 180 degrees) according to the type of antenna.

In general, the signal vendor system is a compact and simple system that is used in a shaded area where radio waves are not transmitted due to obstacles mainly in a general cable broadcasting station (SO) area. The signal vendor system can be installed on the roof of a building or on a mountain to cover a shaded area, usually within a 15 ° to 180 ° angle, and propagate up to 20 km. In addition, in order to avoid interference with the radio wave from the main transmitter, the relay is relayed using different vertical or horizontal polarization schemes.

6 is a detailed block diagram of the head end of FIG. 1, wherein the head end 30 (see FIG. 1) includes a digital satellite receiver 601, a transcoder 602, a channel divider 610, a channel encoder 620, and a multiplexer. 630, a QAM modulator 640, a VHF amplifier 650, and a VHF distributor 660.

The digital satellite receiver 601 receives a digital QPSK program broadcast signal distributed from a satellite and provides the program broadcast signal to the transcoder 602. The transcoder 602 transmits a QPSK method digital signal in a QAM modulation method in a compressed state. The signal stream is controlled and provided to the QAM modulator 640 for conversion.

The channel divider 610 receives the over-the-air broadcast and the analog signal, distributes the signals by channels, converts them into analog signals of video and audio, and provides them to the channel encoder 620. The channel encoder 620 provides over-the-air broadcast channels, local broadcast channels, An analog signal such as a spare channel is compressed into a digital signal of MPEG-2.

The digital multiplexer 630 multiplexes the MPEG-2 compressed digital signal and provides it to the QAM modulator 640. The QAM modulator 640 QAM the digital signal of the transcoder 602 and the digital signal of the multiplexer 630. Modulate to (signal levels 16, 64, 256, ...).

The VHF amplifier 650 amplifies the signal from the QAM modulator 640 for transmission over the wired network.

The VHF distributor 660 distributes the QAM modulated signal as a signal for transmission to the transmitter of the LMDS / MMDS base station and supplies it to the LMDS transmission system and the MMDS transmission system.

For reference, as shown in FIG. 7, the subscriber-side system includes a directional receiving antenna 700, a down converter 710, an optical end station device 720, a digital set-top box 730, and a TV / monitor. do.

The directional receiving antenna 700 is a device for receiving a transmitted signal to transmit to the down-converter 710, may employ a planar antenna for receiving the LMDS signal and a parabolic or Yagi antenna for receiving the MMDS signal. The down converter 710 lowers the frequency to supply a signal received from the receiving antenna 700 to an input terminal of the set top box 730. Further provided with a power supply rectified to DC 18V to supply power to the down converter 710. The digital set-top box 730 is a device for decoding a signal transmitted from the down converter 710 into an analog signal and supplying it to a TV or a monitor. The digital set-top box 730 may be a LMDS / MMDS combined device employing a QAM method and an MPEG-2 method. A device capable of supporting digital wired network signals can be employed. The optical end station apparatus 720 is an apparatus for electrically converting an optical signal supplied to a wired network and supplying it to the digital set-top box 730.

In addition, in a more preferred embodiment of the present invention, in the case of two-way multimedia service subscribers, the uplink (PSTN, ISDN, WLL) rates are low in the case of channel-taking CATV subscribers and high-speed asymmetric Internet service subscribers through uplink allocation channels of LMDS. The subscriber side request message can be transmitted through the uplink allocation channel of the MMDS. In addition, the LMDS transmission tower further includes a transceiver for receiving and transmitting subscriber request messages, as well as a transceiver for receiving and transmitting subscriber request messages for the MMDS / LMDS transmission tower and the MMDS transmission tower. It is provided. In addition, the headend further includes means for receiving and interpreting a subscriber request message and for selectively outputting corresponding program information or data information according to a subscriber's request.

In the present embodiment, by combining the digital MMDS method and the digital LMDS method to adaptively select one of the two methods according to the local environment or climatic environment, the initial high compared to the wired alone or LMDS wireless complementary method It can secure a home pass rate and provide reliable services.

In addition, in case of an accident caused by natural disaster, it is possible to construct an overlapping network with MMDS in preparation for rain attenuation of LMDS.In case of a broadcasting accident, various transmission network equipments such as headend equipment or repeater can be doubled into an operation system and a preliminary system. It can also be switched over automatically when it occurs.

As a further embodiment of the present invention, another embodiment of the headend equipment for constructing a wireless CATV network is shown in FIGS. 8 and 9. FIG. 8 is a configuration diagram of a CATV transmission network employing a MMDS / LMDS hybrid scheme, and FIG. 9 is a configuration diagram of a CATV transmission network employing a digital / analog radio system.

In FIG. 8, the integrated wired broadcasting station (S0) portion 800 provides a studio system 801, a billing system 802 that charges a fee according to the broadcast viewing, a scrambler 803 for preventing unjust viewing, and a program. Equipment 804 for receiving and distributing audio / video (A / V) signals. In addition, a plurality of encoders encoding the A / V signals of the audio / video distributor 804 for each channel, a plurality of multiplexers for multiplexing and then modulating several signals encoded for each channel, and then combining the plurality of modulated signals. And a modulator and combiner.

The wireless network operator (NO) portion 850 distributes the program signals of the SO 800 received through a coaxial cable or a wireless point-to-point transmitter to the MMDS transmission system 852 and the LMDS transmission system 853. And the MMDS transmission system 852 up-converts the VHF signal to 2.5 mW and transmits it through the transmission antenna 854, and the LMDS transmission system 853 up-converts the VHF signal to 27 mW and transmit antenna ( 855).

In FIG. 9, the integrated cable broadcasting station S0 900 includes an analog signal processing unit and a digital signal processing unit, and the analog signal processing unit is a studio system 910 and a system for scrambling a program source to prevent fraudulent viewing. 911, and a plurality of modulators 912 for analog modulation of the broadcast program signal for each channel, the digital signal processor is a studio system 920, a system 921 for digitally encoding and compressing the program source, the compressed signal It consists of a plurality of modulators 922 for digitally modulating each channel. The SO 900 combines the analog modulated signal and the digital modulated signal and transmits the same to the wireless transmission network operator (NO) 950 through a coaxial cable or an optical cable. At this time, the signal attenuation of the transmission phase is amplified by the relay amplifiers 930 and 940 on the wired line.

The wireless network operator (NO) part 950 is a demultiplexer 951 that separates the program signal of the SO 900 received through the coaxial / optical cable into an analog modulation channel signal and a digital modulation channel signal, respectively, and an analog modulation channel signal. Is composed of a plurality of analog up-converters (CH1, CH3, CH5, ...), a combiner (952), a transmission antenna (954) for up-converting and combining the signals by up-converting them. And a plurality of digital up-converters (CH2, CH4, CH6, ...), a combiner 953, and a transmission antenna 955 which are later transmitted wirelessly.

As described above, the present invention not only provides a wireless broadband distribution system using the advantages of MMDS and LMDS, but also distributes the transmission equipment network to MMDS and LMDS without having to make redundant investment in encoding equipment. In addition, the MMDS has the advantage of improving the economics of the MMDS and at the same time avoiding the disadvantages of the LMDS due to radio wave attenuation during rainfall. In addition, LMDS can provide a large amount of data transmission and additional communication services by utilizing a wide frequency bandwidth.

Designed in an open structure and modular way to facilitate the scalability and advanced network of wireless digital distributed network, the network can be constructed quickly and inexpensively, and the maintenance cost is much lower than that of wired network. In addition, it can respond quickly to changes in the network due to frequent urban redevelopment and housing complex construction. In addition, the present invention can provide a service using a wireless network in the urban or shaded area is a wired network in the urban or shaded area where the number of households is densely mixed with the farming and fishing village, the wireless network by complementary use of the wireless network and wired network It is possible to provide balanced service between regions by securing a home pass rate in a large area at the beginning of the project.

Claims (14)

A headend for digitally encoding and digitally modulating program information / data information for each channel; Receives digital information signal transmitted from the headend through a wired or wireless network and converts it to a corresponding frequency band by using a multi-channel multi-distribution service (MMDS) transmitter or a local multipoint multi-point distribution service (LMDS) transmitter to simultaneously convert the MMDS MMDS / LMDS transmission means for transmitting a microwave signal and an LMDS microwave signal; And LMDS transmission means for receiving and relaying LMDS microwave signals transmitted from the MMDS / LMDS transmission means. According to claim 1, MMDS transmission means for receiving the digital information signal transmitted from the head end via a wired or wireless network and up-converts by using a multi-channel multi-distribution service (MMDS) transmitter to transmit the MMDS microwave signal MMDS / LMDS complex transmission system comprising a. The subscriber side receiving means according to claim 1 or 2, further comprising a subscriber side receiving means for receiving a signal transmitted from the MMDS / LMDS transmitting means or from the LMDS transmitting means or the MMDS transmitting means to down-convert and reproduce the signal. MMDS / LMDS complex transmission system. The MMDS of claim 1 or 2, wherein an MMDS is connected between a plurality of LMDS transmission means serving on a cell basis or between the LMDS transmission means and the MMDS / LMDS transmission means. / LMDS complex transport system. The MMDS / LMDS hybrid transmission system according to claim 1 or 2, wherein the signal vendor system covers the shadow area existing in the MMDS service area. 2. The MMDS / LMDS composite transmission system according to claim 1, further comprising distributing means for distributing and providing digitally modulated program information / data information to the MMDS transmitter and the LMDS transmitter. 4. The MMDS / LMDS composite transmission system according to claim 3, wherein the subscriber side request message is transmitted through an allocation channel of the LMDS band or an allocation channel of the MMDS band along an uplink radio path formed from the subscriber side to the service provider side. 8. The MMDS / LMDS complex transmission system according to claim 7, wherein the LMDS transmission means further comprises a reception means for receiving and transmitting a subscriber side request message. 8. The MMDS / LMDS complex transmission system according to claim 7, wherein the MMDS / LMDS transmission means further comprises a reception means for receiving and transmitting a subscriber side request message. 8. The MMDS / LMDS complex transmission system according to claim 7, wherein the MMDS transmission means further comprises a reception means for receiving and transmitting a subscriber side request message. 8. The apparatus of claim 7, wherein the headend comprises: means for receiving and interpreting a subscriber side request message; And And a means for selectively outputting corresponding information according to a subscriber's request. 4. The MMDS / LMDS composite transmission system according to claim 3, wherein the subscriber-side receiving means includes a down converter for down converting the LMDS signal and the MMDS signal jointly. 13. The MMDS / LMDS complex transmission system according to claim 12, wherein the subscriber-side receiving means further comprises a down converter for down converting the downlink LMDS signal and the downlink MMDS signal into the VHF / UHF frequency. Means for digitally processing program information / data information for each channel and analog processing for each channel, and combining a plurality of digitally processed channel signals and a plurality of analogly processed channel signals to be selectively over a wired or wireless path. Or a headend transmitting simultaneously; MMDS / LMDS transmission means for up-modulating the analog channel signal of the headend to the MMDS frequency band and for converting the digital channel signal to the LMDS frequency band selectively or simultaneously; LMDS transmission means for receiving and relaying LMDS microwave signals among the microwave signals transmitted from the MMDS / LMDS transmission means; And And a subscriber side receiving means for receiving down-converted and reproduced microwave signals transmitted from the MMDS / LMDS transmission means or from the LMDS transmission means.