KR100327405B1 - Wide Band LMDS(Local Multipoint Distribution Service) System - Google Patents

Abstract

The present invention relates to a broadband digital local multi-access distributed service system having a structure that can be easily interworked with an existing network. The broadband digital local multi-access distributed service system according to the present invention provides a dedicated line service, an Internet service, and a public switched telephone service. Or serially connects itself with an ATM PBX that selectively interfaces between digital access and interconnection systems (DACS), ATM switches, telephone exchanges, and network management systems to perform overall management of a local, multiple-access distributed service network. A plurality of ends connected to the ATM PBX, receiving ATM cells provided from the ATM PBX, generating TS (Transport) stream signals from the ATM cells, and transmitting the same through a predetermined base band A headend, a plurality of base stations connected separately from each of the headends, It consists of a plurality of encoders, each of which encodes an output program and provides each to the headend.

Description

Wideband Digital Local Multi-Access Distributed Service System {Wide Band Local Multipoint Distribution Service (LMDS) System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband digital local multipoint distribution service (LMDS) system. In particular, the present invention provides subscribers with video services by integrating and interworking with a wired network based on an asynchronous transfer mode (ATM) network. And a broadband digital local multiple access distribution service system adapted to provide multimedia services such as voice, data, leased line, and the like.

In the conventional local multiple access distributed service system, as shown in FIG. 1, the devices 1 of the service provider and the subscriber devices 2a and 2b (Customer Premises Equipment (CPE)) may be classified.

The equipment 1 of the service provider includes a network access device 3, a headend / base station 4, a telephone exchange 6, an ATM switch 5, a digital access and cross-connect system: DACS) 7, a network management system 8, an integrated network management control station 9, and a billing processing unit 10.

Subscriber device is composed of home subscriber device (2a) and office subscriber device (2b), each subscriber device (2a, 2b) is an outer unit (Out Door Unit) 15a, 15b and In Door Unit (In Door Unit) It consists of (16a, 16b). In addition, the PC 17 and the telephone 18 are connected to the internal unit 16a as a peripheral device of the home subscriber device 2a, and the PC 17 and the phone 18 are peripheral devices of the office subscriber device 2b. ), A Private Automated Branch Exchange (hereinafter referred to as PABX) 19 and a router 20 are connected to the external unit 16b.

The operation of a conventional local multiple access distributed service system having such a configuration will be described with reference to FIG. 1.

Referring to FIG. 1, in a conventional local multiple access distributed service system, various interworking networks such as the Internet 12, a Public Switch Telephone Network (PSTN) 13, and a dedicated line 14 are connected to a network. It is linked through (3).

Here, the WLL (Wireless Local Loop) service is provided between the network connection device 3 and the telephone switchboard 6 by accepting the V 5.2 protocol. The Internet service using the Internet 12 is a TCP / IP protocol. Is received and routed from the ATM switch 5 through the ATM network 11 and connected to the network connection device 3. The ATM switch 5 and the network connection device 3 are configured in the form of a frame that can accommodate DS-3 (44.736 Mbps) and STM-1 (155.52 Mbps). DACS (7) is a network connection device (3) is configured in the form of a frame that can accommodate the DS1E (2.048 Mbps), DS-3 (44.736 Mbps), STM-1 (155.52 Mbps) by accepting the dedicated line (14) Connected with The network management system 8 receives current local multi-access distributed service network state data from the network access device 3 and uses the Simple Network Management Protocol / Common Management Information Protocol protocol. Network management. The billing processing unit 10 is connected to the telephone exchange 6 and the ATM switch 5 to perform billing operations using centralized automatic message accounting.

However, in the conventional communication technology field as described above, the standardization of the configuration and function of the network access device is not clearly presented. Therefore, the function and configuration of the network access device to satisfy all the interface specifications between the service network and the network access device, such as PSTN, Internet, leased line is a very complex state.

Therefore, as the local multi-access distributed service providers and developers construct their own local multi-access distributed service network and design their own functions according to their ideas, compatibility problems between products are expected in the future.

In addition, in the conventional local multiple access distributed service network, if the headend and the base station are located in the same place, and the subscribers are distracted when the cell is configured, one headend and the base station per cell covering a certain area are independent of the call volume. It must be built in a certain area. This factor causes unnecessary resource waste in constructing the local multi-access distributed service system and increases the overall system construction cost.

Disclosure of Invention An object of the present invention is to provide a broadband digital local multiple access distributed service system having a structure that can be easily interworked with an existing network.

Another object of the present invention is to provide a broadband digital local multiple access distributed service system in which one headend and a base station can handle the maximum call amount even when subscribers are distracted in cell configuration.

According to an aspect of the present invention for achieving the above object, in order to perform the overall management of the broadband digital local multi-access distributed service system dedicated line service, Internet service, public switched telephone service or local multi-access distributed service network ATM PBXs that selectively interface between digital access and interconnection systems (DACS), ATM switches, telephone exchanges, and network management systems, and both ends connected in series and not connected to the ATM PBXs, respectively. And a plurality of headends receiving the ATM cells provided from the ATM PBX, generating TS (Transport) stream signals from the ATM cells, and transmitting them through a predetermined base band, and connected to the headends in a state of being separated from each of the headends. A plurality of base stations and a plurality of base stations each encoded by the input program and provided to the headend. It is configured to include a coder.

According to the features of the present invention as described above, it is possible to replace the ATM PBX with a network access device in a conventional local multi-access distributed service network configuration and to apply it to a real system implementation, thereby efficiently providing a local multi-access distributed service system at a low cost. There is an advantage to apply.

1 is a block diagram of a conventional local multiple access distributed service network.

2 is a block diagram of a broadband digital local multiple access distributed service network having a ring structure according to the present invention;

3 is a block diagram of a broadband digital local multiple access distributed service network in a star structure according to the present invention;

4 is a block diagram of the network connection device shown in FIG.

5 is a configuration diagram of the head end shown in FIG.

6 is a block diagram of a base station configured in FIG.

FIG. 7 is a block diagram of a subscriber device shown in FIG. 2; FIG.

* Description of the symbols for the main parts of the drawings *

21a-21c: Headend 22a-22: Base Station

23a-23c: MPEG-2 TS Encoder 26: ATM PBX

27: billing processing unit

28: digital access and interconnection systems

29: ATM switch 30: telephone exchange

31 network management system 32 integrated network management control station

33: PSTN34: Internet

35; Dedicated line 51-56: connection module

57: Circuit Emulation 58: Per-VC Queuing

59: ATM switch 60: user parameter control unit

61: maintenance operation management unit 62: separation and recombination unit

63: V 5.2 protocol 65: permanent green channel

66: call processing unit 67: inter-rim (ILMI) management entity

68: network management connection 69: operator

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The broadband digital local multiple access distributed service network according to the present invention may be classified into a service provider 43 and subscriber devices 44a and 44b as shown in FIGS. 2 and 3.

As shown in FIG. 2, the service provider 43 of the broadband digital local multiple access distributed service network includes a digital processor for matching an interface between an input / output signal when communicating with a charging line 27 and a dedicated circuit 35 to process charging for a network user. An access and interconnection system (DACS) 28, an ATM switch 29 for performing cell exchange in communication with the Internet 34, and a telephone exchange 30 for matching an interface of input and output signals during communication with the PSTN 33. ), And overall management of the network management system 31 that matches the interface of the input / output signal when communicating with the integrated network management control station 32, a dedicated line service, an Internet service, a public switched telephone service, or a local multiple access distributed service network. An ATM PBX 26 that selectively interfaces between the digital access and interconnection system (DACS) 28, the ATM switch 29, the telephone exchange 30, and the network management system 31 for execution; In general, it is connected in series and both ends are connected to the ATM PBX 26 to receive an ATM cell provided by the ATM PBX 26, generate a TS stream signal from an input program, and transmit it through a predetermined baseband. A plurality of headends 21a-21c, a plurality of base stations 22a-22c connected to each of the headends 21a-21c, and a local broadcast program 24a-24c or a satellite receiver 25a. MPEG-2 TS encoder 23, which encodes the program provided by -25c) and provides them to the headends 21a-21c, respectively.

At this point, it should be noted that when configuring a digital local multiple access distributed service network considering the connection relationship between the ATM PBX 26 and the plurality of headends 21a-21c, the ring type local multiple access distributed service network structure is designed as shown in FIG. 2. can do. In contrast, in FIG. 3, each head end 21a-21c may be individually connected to the ATM PBX 26 to design a star structure. The ring-type local multi-access distributed service network is composed of optical cables between the headends 21a-21c, so if one headend fails, the other headend can continue to provide services. Going up On the other hand, star type local multi-access distributed service network is easy to configure the network, and can be reduced in price, but service is stopped in the event of a line failure.

In addition, as shown in FIG. 2 and FIG. 3, the headends 21a-21c and the base stations 22a-22e are separated from each other when providing the remote service, so that the headends 21a-21c and the base stations 22a-22e are separated. It has the advantage of freeing up space.

Here, ATM PBX 26 has a function of a network connection device, as shown in Figure 4 E1 connection module 51, DS-3 connection module 52, STM-1 connection module 53, STM -4 Connection Module (54), Ethernet Connection Module (55), Fast Ethernet Connection Module (56), Circuit Emulation Device (57), Per-VC Queuing Device 58, ATM switch 59, user parameter control unit 60, operation and maintenance unit 61, separation and recombination unit 62, V5.2 device 63, ATM signal device 64, permanent It consists of a permanent channel (PVC) 65, a call processing device 66, an interrim (ILMI) management entity 67, a network management connection device 68, and an operator 69.

Here, the headend 21 is an ATM mixer unit 71, a headend management server 72, and a MAC process unit 73 as shown in FIG. 5. ), QPSK Modulator Unit (74), Downstream Channel Unit (75), Upstream Channel Unit (76), Internal Channel Unit (77) , An internal divider unit 77, an optical network unit 78, an NMS agent master unit 79, an internal power supply unit ( 80).

In addition, the base station 22 may include a microwave converter 81, a directional antenna 82, an optical network unit 83, an outdoor divider unit 84, as shown in FIG. An external coupling unit (Optical Channel Unit) 85, an external power supply unit (Outdoor Power Supply Unit) 86, NMS Agent Slave Unit (NMS Agent Slave Unit) (87).

The subscriber device is divided into an external unit 101 of the home subscriber device and an external unit 102 of the office subscriber device, as shown in FIG. The external unit 101 includes a microwave converter 103, a duplex 104, and a directional antenna 105. On the other hand, external unit 102 is CPU / MAC 106, down converter 107, up converter 108, dual A / D converter 109, DQPSK modulator / RS encoder 110, QPSK demodulator / forward error. It consists of a correction 111, an ATM interface 112, a PSTN interface 113, and an ATM-LAN interface 114.

In this case, peripheral devices of the external units 101 and 102 include a PC 115, a telephone 116, a set top box (STB) 117, and a TV 118.

However, the PBX 61 and the router 62 are connected to the external unit 102 of the office subscriber device.

Hereinafter, an operation according to an exemplary embodiment of the present disclosure will be described with reference to the accompanying drawings.

The local multi-access distributed service network according to the present invention serves as an interface with the telephone exchange 30 for the PSTN service 33 using the ATM PBX 26 device in FIGS. 2 and 3, and the dedicated line 35. It serves as an interface with the DACS 28 for service, and serves as an interface with the ATM switch 29 for the Internet service 34, and with the network management system 31 for the overall network management of the local multi-access distributed service. Serves as an interface for In addition, the ATM PBX 26 multiplexes and routes the ATM cells and transmits the STM-1 (155.52 Mbps) over an optical cable to provide a service to a subscriber.

ATM PBX 26 is a total 2.5 (10Gbps capacity ATM switching system that can accommodate up to 84 ATM terminals and is designed for high-speed multimedia services at the corporate level. The internal structure of the ATM PBX 26 is shown in FIG. As shown.

This system basically performs a call processing function 66, a signal processing function 64, a call control function 60, an operator management holding function and a resource management function 67. From the DACS 28, the ATM switch 29, the telephone exchange 30, the network management system 31, the charging processing unit 27, the E1 connection module 51, which is the user network interface (UNI), and the DS-3 connection module ( 52) STM-1 connection module 53, STM-4 connection module 54, Ethernet connection module 55, fast Ethernet connection module 56, The payload is extracted by finding the corresponding frame sync from each of the received bit strings, and the payload is generated to map the payload. The ATM switch 59 plays a role of exchanging cells, and the use parameter control (Usage Paramater Control) 60 prevents accidental malfunctions as well as intentional operations that may affect the quality of service (QoS) of established connections. Detects violations of negotiated parameters and takes appropriate action to protect resources. The ATM signal processor 64 may use a constant bit rate (CBR), a variable bit rate (VBR), a non-permanent permanent channel (PVC), a switched virtual channel (SVC), and the like. ATM services such as Unvariable Bite Rate (UBR) and Available Bite Rate (ABR) are provided.

The headends 21a-21c generate MPEG-2 TS streams from the MPEG-2 encoders 23a-23c by receiving MPEG-2 programs from satellites or analog programs from local broadcasting companies to provide broadcast services. Send it on a fixed baseband. In addition, the ATM cell is transmitted from the ATM PBX 26 to provide the Internet 34, the dedicated line 35, and the PSTN service 33.

FIG. 5 is a configuration diagram of the head end shown in FIG. 2. Referring to FIG. 5, the headend forms a basic system using a basic downstream 40 MHz 1 channel and an upstream 5 MHz 4 channel for service of the PSTN 33, the Internet 34, and the dedicated line 35, and expands the same. The system is configured with an upstream 60MHz in the downstream 120MHz band. In addition, the system is composed of a downstream 40MHz 1 channel for a broadcast service.

The broadcast service receives the transport stream from the MPEG-2 TS encoders 23a to 23c, modulates it in the QPSK modulator 74, and transmits the upstream channel to the base station 22 after up-converting the frequency in the downstream channel unit 75. The following is an operation description for the PSTN 33, the Internet 34, and the dedicated line 35 services. ATM Mux Unit 71 provides three ports of OC-1 (51.84 Mbps) for STM-1 (155.52 Mbps) sent from ATM PBX 26 for downstream transmission from service provider to subscriber device. In this case, the upstream stream transmitted from the subscriber device to the service provider is transmitted to the MAC processor unit 73 and is transmitted to the service provider. Multiplex to 1 to pass to ATM PBX 26. The headend management server 72 controls the Mac processor unit 73 and changes the channel to another channel when the QPSK modulator 74 is interrupted due to congestion of the channel. In charge.

The Mac processor unit 73 installs, maintains, and manages physical media for communication between the service provider and the subscriber device. In addition, it receives the OC-1 level data for the downstream from the ATM mixer unit 71 to form a frame structure that can accommodate multimedia, and transmits it to the QPSK modulator 74, and transmits the upstream channel unit data about the upstream channel. It receives from 76 and analyzes it and processes itself internally in case of MAC data and transparently transmits ATM cell data in case of data stream. The Mac processor unit 73 provides bandwidth request allocation using Time Division Multiple Access (TDMA), and allocates reserved bandwidth for certain bit rate application services such as voice services or video conferencing, and the ATM layer. Quality of Service (QoS) is maintained, and a higher collision avoidance mechanism (Collision Avoidance Mechanism) must be provided for higher layers. The QPSK modulator 74 packetizes the information data sent from the Mac processor unit 73 in units of 188 bytes to perform modulation and channel coding (convolution encoding, convolution interleaving, Reed Solomon encoding).

The downstream channel unit 75 converts the modulated carrier frequency from the QPSK modulator 74 into one channel between 950 and 2.050 MHz, amplifies it to an appropriate output, and transmits the result to the internal distribution unit 77. . The inner coupling unit 77 combines several down channel radio frequencies (RFs) sent from the downstream channel unit 75 and transmits them to a base station 22 by using an optical cable in a long distance to one output terminal. In the case of short-range transmission to the base station 22 using a coaxial cable. The inner coupling unit 77 distributes the uplink RF signal transmitted from the base station to several channels and transmits the uplink channel RF signal to the upstream channel unit 76. The upstream channel unit 76 demodulates and channel decodes (lead solomon decoding) the signal sent from the inner combining unit 77 to transmit the information data to the Mac processor unit 73. The NMS agent master unit 79 may include various devices (eg, QPSK modulator 74, downstream channel unit 75, upstream channel unit 76, internal power supply unit 80) within the headend equipment. Collect the operation state information of the C) and transmit the data from the central processing unit to the Mac processor unit 73 and demodulate the modulated signal from the NMS agent slave unit N87 of the base station to detect the data and then perform the central processing. It transmits from the device to the Mac processor unit 73. The internal power supply unit 80 serves to stably supply power required by various units of the headend equipment and to indicate its operation state.

6 is a configuration diagram of the base station 22 configured in FIG. Referring to FIG. 6, the base station 22 according to the present invention includes a microwave converter 81, a directional antenna ANT11-ANT14, an optical network unit 83, an external divider unit 84, and an external device. A combined unit (Outdoor Combiner Unit) 85, an external power supply unit (Outdoor Power Supply Unit) (86), NMS Agent Slave Unit (NMS Agent Slave Unit) (87). In the optical network unit 83, the signal transmitted from the optical cable at the head end 21 is converted into an RF signal and transmitted to the internal distribution unit / external coupling unit 84, 85, respectively, and in the external distribution unit 84, the optical network. The radio frequency modulated signal received from the unit 83 is received and distributed to the microwave converter 81. The microwave converter 81 converts the signal sent from the external distribution unit 84 into a microwave band and then amplifies the signal from the fixed state power amplifier (SSPA) to high power to transmit it to the sector antenna ANT11-14. It converts the frequency of the microwave band from the role and the subscriber to the intermediate frequency band (200-700 MHz) and transmits it to the external coupling unit 85. The external coupling unit 85 combines the signals of the intermediate frequency bands sent from the microwave converter 81 and transmits them to the optical network unit 83 at one output terminal. The NMS agent slave unit 87 collects the operating states of the microwave converter 81 and the external power supply unit 86 in a central control unit and digitally modulates them to the head end 21 via the external distribution unit 84. send. The external power supply unit 86 stably supplies the power required by each unit of the base station 22 and indicates its operation state and transmits it to the NMS agent slave unit 87. The directional antenna ANT11-14 of the base station 22 installs a standard omni-directional antenna for video service, and operates four sector antennas to have a 90 ° direction angle in four directions for data and WLL services.

As illustrated in FIG. 7, the home subscriber apparatus may be described by being divided into an external unit 101, an internal unit 102, and a peripheral device 115-118. The external unit 101 consists of a microwave converter 103 and a directional antenna 105, usually mounted on the roof of the subscriber's home and directed to the base station 22 antenna in the area with a beam width of about 3-4 °. I design it to a degree. The microwave converter 103 converts the microwaves transmitted from the base station 22 into the intermediate frequency band (950-2,050 MHz) and transmits them to the duplex 104, and also into the intermediate frequency band (200-700 MHz) for the uplink signal. The converted upstream frequency is received, converted into an uplink microwave band, amplified to an output of 100mW-500mW, and transmitted to the directional high gain antenna 105. The directional high gain antenna 105 should be installed so as to be in a line of sight (LOS) state so that possible communication with the antenna of the base station 22 is possible. Meanwhile, the internal unit 102 includes the CPU / MAC 106, the down converter 107, the up converter 108, the dual A / D converter 109, the DQPSK modulator / lead Solomon coder 110, and the QPSK demodulator / forward. It is composed of an error correction 111, an ATM interface 112, a PSTN interface 113, and an ATM-LAN interface 114. The peripheral device includes a PC 115, a telephone 116, a set top box (STB) 117, and a TV 118. The CPU / MAC 106 controls the down / uplink channel frequencies of the downconverter 107 and the upconverter 108, formats the data to the modulator of the DQPSK modulator / RS encoder 110, and QPSK demodulator 111 Processes the decoded data and controls the interworking with the ATM interface 112 and controls the operation of the entire internal unit 102. The down-converter 107 selects a specific channel from the downlink frequency band sent from the base station 22, transmits the signal to the dual A / D converter 109, converts it to digital, and demodulates the QPSK demodulator / forward error correction stage 111. After correcting the error is transmitted to the ATM interface (112). The DQPSK modulator / RS encoder adds redundant information for modulation and error protection, amplifies an uplink signal to transmit to the duplex 104 for transmission from the upconverter to the base station 22. The ATM interface 112 performs segment and reassembly function and processes the ATM cell data sent from the base station 22 to the PSTN interface 113 or the ATM-LAN interface 114 according to the type of the received data. Data to be transmitted or sent from the subscriber station to the base station 22 is formatted into an uplink frame structure and transmitted to the DPSK modulator. The PSTN interface 113 performs a function of processing a constant bit rate of AAL-1 so as to make a telephone call. The ATM-LAN interface 114 may perform variable bit rate (VBR) processing of AAL-5 for packet data communication with a PC. The PC 115 used as a peripheral device is necessary equipment for use for a LAN, and the telephone 116 is a device required for use for a WLL (Wireless Local Loop). The video STB 117 for the video service can watch satellite programs and local broadcasting using a digital DBS receiver.

The difference between an office subscriber device and a home subscriber device is that a small capacity private exchange (PABX) 41 must be provided in the office, and a T1 / E1 interface is provided to enable connection with the small capacity private exchange (PABX) 41. A LAN server 42 is needed to make the LAN available to multiple subscribers.

As described above, the present invention can be applied to the actual system implementation by replacing ATM PBX with a network access device in the conventional local multi-access distributed service network configuration, so that the local multi-access distributed service system can be efficiently applied at low cost. Can be.

In addition, when designing a ring-type local multi-access distributed service system, the system can be flexibly designed by using Add-Drop multiplexing branch using STM-4 (622.08Mbps) to connect the ATM PBX and the headend. .

In addition, when designing a star-type local multi-access distributed service system, the optical fiber directly connects the ATM PBX and the headend, making it easy to implement and low cost.

Here, by using the MPEG-2 TS encoder in the head end, it is possible to provide a pay per view (PPV) service at a low investment cost. In addition, by using the MPEG-2 TS encoder at the head end, it is possible to provide a one-way satellite broadcasting service at a low investment cost.

In addition, since it is connected to the network management system and the billing processing unit through the ATM PBX, it is possible to improve the speed, and there is an advantage that the subscriber network management is convenient.

In addition, it is possible to provide various multimedia services (WLL, Internet, dedicated line), and to flexibly apply to services such as video conferencing, home banking, home shopping, GOD (Game On Demand), and NOD (News On Demand). It can be effective.

Claims (7)

Dedicated line services, Internet services, public switched telephone services, or local multi-access distributed services networks selectively interface between digital access and interconnection systems (DACS), ATM switches, telephone exchanges, and network management systems to perform forward management. Performing ATM PBX, Both ends connected in series and not connected to each other are connected to the ATM PBX, respectively, and separate and output a signal transmitted from the ATM PBX in the downstream from the service provider to the subscriber device, and at the subscriber device In the case of upstream stream, the ATM mixer unit (MTM) which receives the signal provided from the MAC processor unit and muxes it and delivers the signal to the ATM PBX, and controls the MAC processor unit, and when the channel congestion occurs Installs, maintains, and manages a physical medium for communication between the service provider and the subscriber device, and which is downstream from the ATM mixer unit. Create a frame structure that can receive multimedia data and accommodate multimedia And a MAC processor unit for receiving the data on the uplink channel and analyzing the received data about the uplink channel and internally processing the MAC data and transparently transmitting the ATM cell data in the case of the data stream, wherein the ATM cell provided by the ATM PBX is provided. Receiving a plurality of headends to generate a transport stream signal from an ATM cell and transmitting the same through a predetermined baseband; An optical network unit connected to the headends separately from the headends, and converting the signals transmitted from the headends into radio frequency signals, and outputting the signals; and an external distribution unit receiving and distributing modulation signals output from the optical network units; After converting the signal output from the external distribution unit into a microwave band and amplified to a high output and transmitted to the sector antenna, and also from the frequency of the microwave (Microwave) band from the subscriber to the intermediate frequency (Intermediate Frequency) band A microwave control unit for outputting, an external coupling unit for combining the signals of the intermediate frequency band output from the microwave converter and transmitting them to the optical network unit in one output terminal, and collecting the operating state of the microwave converter in the central controller. And digitally modulate A plurality of base stations including an NMS agent slave unit for transmitting to the headend via the external distribution unit; And a plurality of encoders each of which inputs an input program and provides them to the headend. The method of claim 1, The plurality of headends are individually connected to the ATM PBX, respectively, to receive an ATM cell provided from the ATM PBX, generate a TS (Transport) stream signal from an input program, and transmit the same through a predetermined baseband. A broadband digital local multiple access distributed service system. The method of claim 1, The ATM PBX receives signals provided from a plurality of modules, extracts a flow path load by finding a corresponding frame synchronization from each of the received bit streams, and generates a transmitted frame to map the flow path loads. Broadband digital local multiple access distributed service system, characterized in that. The method of claim 1, Each head-ad forms a basic system using a basic downstream 40MHz 1 channel and an upstream 5MHz 4 channel for PSTN, Internet, and leased line service, and expands the system to form an upstream 60MHz in the downstream 120MHz band. Broadband digital local multiple access distributed service system, characterized in that. The method of claim 1, The headend is a QPSK modulation unit for performing modulation and channel coding by packetizing the information data sent from the Mac processor unit, A downstream channel unit for frequency converting and outputting the modulated carrier frequency sent from the QPSK modulator into one channel; An internal combining / distributing unit that combines a plurality of downlink radio frequencies from the downstream channel unit and transmits them to one output terminal, or divides and transmits an uplink RF signal transmitted from a base station to multiple channels; An upstream channel unit for demodulating and channel decoding the signal sent from the internal combining / distributing unit to transmit information data to the Mac processor unit; It collects the operation state information of the various devices in the headend equipment and transmits the information from the central processing unit to the Mac processor unit, and demodulates the modulated signal from the base station to detect the data and then An NMS agent master unit for transmitting to the mac processor unit, Broadband digital local multiple access distributed service system, characterized in that it further comprises an internal power supply unit for supplying power required by the various units of the head-end equipment. The method of claim 1, The directional antenna provided in the base station is installed in a standard omnidirectional for video service, and four sector antennas in four directions for data and WLL service. Broadband digital local multiple access distributed service system, characterized in that arranged to operate with a 0 ° orientation angle. The method of claim 1, A microwave converter for converting and transmitting microwaves output from the base station into an intermediate frequency band, receiving an upstream frequency converted into an intermediate frequency band for an uplink signal, converting the microwave signal into an uplink microwave band, and amplifying and transmitting a predetermined amplification ratio; An external unit consisting of an antenna of the base station and a directional high gain antenna for enabling visible distance communication if possible; CPU / MAC which controls downlink / uplink channel frequency, formats the data to be transmitted, processes the decoded data, and downlink selects and transmits a specific channel in the downlink frequency band transmitted from the base station and transmits it digitally. Transmitter, DQPSK modulator / RS encoder which adds and transmits redundant information for modulation and error protection, and performs segment and reassembly function and processes ATM cell data transmitted from the base station to receive received data. ATM interface that selects and transmits a destination according to the type, or formats and transmits data to be transmitted from the subscriber station to the base station in an up channel frame structure, a PSTN interface that provides a function for providing a telephone call service, and a PC. Configured with ATM-LAN interface to provide packet data communication services Wideband digital multiple access local distributed services system, characterized in that configured to include a further sub-unit.