KR100868866B1 - System for providing high-speed bidirectional communication service using hybrid-fiber coaxial network - Google Patents

Abstract

Disclosed is a communication service providing system using an optical coaxial mixed network for providing not only a broadcast video service but also a high-speed bi-directional Internet service. In a communication service providing system according to the present invention, a broadcast band determining means for determining a first band for transmitting the broadcast signal when the broadcast signal is transmitted through an optical coaxial mixed network, and an IP signal through the optical coaxial mixed network. And IP band determining means for determining a second band for transmitting the IP signal during transmission, wherein the IP band determining means includes a residual not determined as the first band among the allowable bands of the optical coaxial mixed network. Among the bands, a second band having a minimum value of n is determined.

Optical coaxial mixed network, OFDM, end-to-end communication, many-to-end communication

Description

System for providing high speed bidirectional communication service using optical coaxial mixed network {SYSTEM FOR PROVIDING HIGH-SPEED BIDIRECTIONAL COMMUNICATION SERVICE USING HYBRID-FIBER COAXIAL NETWORK}

1 is a diagram showing the overall network configuration in a conventional optical coaxial mixed network.

2 is a diagram showing the overall configuration of a communication service providing system according to an embodiment of the present invention.

3 is a diagram showing a detailed configuration of a communication service providing system according to an embodiment of the present invention.

4 is a diagram illustrating an entire network configuration in an optical coaxial mixed network according to an embodiment of the present invention.

5 is a diagram illustrating a configuration of a node master included in an optical terminal node according to an embodiment of the present invention.

6 is a diagram illustrating a configuration of a node repeater included in a coaxial terminal node according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of a modem included in a subscriber station according to an embodiment of the present invention.

8 is a diagram showing the configuration of the IP signal transmission and reception means in the communication service providing system according to an embodiment of the present invention.

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

200: communication service providing system

210: broadcast signal transmission device

211: broadcast band determining means

212: broadcast signal transmission means

220: IP signal transceiver

221: IP band determination means

222: IP signal transmission and reception means

The present invention relates to a communication service providing system using an optical coaxial mixed network for providing not only a broadcast video service but also a high-speed bi-directional Internet service.

Hybrid Fiber Coax (HFC) is composed of optical fiber or optical cable and coaxial cable. It uses optical fiber from HEAD END to Optical Network Unit (ONU). In other words, from the optical network unit to the subscriber terminal or the indoor terminal, it can refer to a broadband transmission network that can transmit data signals, such as the Internet, cable TV, crime prevention, disaster prevention, remote meter reading, and automatic control using coaxial cable.

In this case, the HEAD END may be a broadcasting station (SO) that transmits a broadcast signal to a subscriber end of an optical coaxial mixed network, or an Internet service supplying station that provides various additional Internet services, and received from a broadcasting station or an Internet service supplying end over several networks. It may also be a station that transmits a broadcast video signal or an IP signal (or an Internet signal) to a subscriber end.

1 is a diagram showing the overall network configuration in a conventional optical coaxial mixed network.

The conventional optical coaxial mixed network shown in FIG. 1 includes an optical transmitter (OTX) 131 in the HEAD END 130 for converting the broadcast video signal received from the broadcast backbone network 110 to the converted optical signal. Downward optical receiver 151 in the outdoor optical receiver (or optical communication network unit) (ONU) 150 for converting the optical cable 140 for transmitting the signal to the outdoor, received optical signal to the coaxial signal, downward for amplifying the coaxial signal The amplifier 152, the up and down combiner 153 for separating (or combining) the up and down coaxial signal, the coaxial network 160 for transmitting the coaxial signal to the subscriber end 170 and the TV receiver 171 to provide a broadcast service do.

In addition, as shown in FIG. 1, the conventional optical coaxial mixed network is connected to the Internet backbone network 120 in the HEAD END 130 to provide a cable modem terminal device (CMTS) for Internet service. An optical receiver (ORX) 133 for receiving an uplink IP signal (or an Internet signal), an uplink optical transmitter 154 in an outdoor optical receiver (or optical communication network unit) (ONU) 150, Internet service is provided to the subscribers of the optical coaxial mixed network through an up amplifier 155 for amplifying an uplink signal, a up-down combiner 153 for separating (or combining) up-down coaxial signals, and a cable modem 172 in the subscriber end 170. to provide.

Therefore, the optical coaxial mixed network not only enables long distance transmission of 20 km or more, but also enables inexpensive Internet service through network sharing of multiple subscribers.

In the conventional optical coaxial mixed network, the broadcast video signal is used by allocating 6 MHz or 8 MHz to one channel among the 55 to 1000 Mbps bands, and assigning a frequency band different from the frequency band for the broadcast video signal. use. In this case, in case of DOCSIS 2.0, the downlink is limited to 6 MHz bandwidth among the 450 to 552 MHz bands and the upper limit is used to 1 to 6 MHz bandwidth among the 5 to 42 MHz bands, so the maximum transmission rate is limited to 42 Mbps for the upstream and the downlink, respectively.

In order to improve the transmission speed, a channel bonding technique is proposed in which a plurality of 6 MHz channels are bundled and transmitted on one channel. Theoretically, 400 MHz of bandwidth is required in 256 QAM standard to perform giga-class high-speed communication, and 800 MHz band is required in consideration of both directions, but it is practically difficult to simultaneously provide broadcasting video service.

 On the other hand, since a plurality of subscribers share and use the maximum transmission rate of the channel, the more concurrent users, the lower the actual speed is.

In order to secure these shortcomings, cell-splitting technology that limits the number of subscribers connected to one outdoor optical receiver is applied, but this requires not only investment in expensive CMTS and ONU expansion, but also the maximum between CMTS and cable modem. The transmission rate is limited to 42 Mbps for the DOCSIS 2.0 standard and 200 Mbps for the DOCSIS 3.0 standard.

 In order to solve this problem, the CMTS equipment is replaced by an Ethernet switch with a built-in digital optical transmitter, a media converter including a two-way optical transmitter instead of an uplink optical transmitter in the ONU, and a 5 to 42 MHz band. A new method for bidirectional communication using the 5 ~ 42 MHz band has been introduced using a modem capable of bidirectional communication based on PLC through a coaxial network.

As a result, not only 200 Mbps bidirectional communication can be performed, but also high-speed transmission is possible without using an additional amplifier by using relatively little loss in the coaxial network. However, this method also has a limitation that the maximum speed is limited to 200 Mbps.

Accordingly, the present invention is to propose a new technology that can provide a giga-class high-speed two-way Internet service as well as broadcast video services.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a giga-class high-speed Internet service as well as a conventional broadcast video service by applying an existing optical coaxial mixed network. That is, an object of the present invention is to enable high-speed transmission of 1 Gbps or more by using a frequency band of 100 MHz or more.

In addition, an object of the present invention is to enable the active adaptation to the coaxial channel of the up and down signal transmission and reception due to the advantages of the adaptive OFDM technology.

In addition, an object of the present invention is to enable full-duplex transmission according to the uplink and downlink signal separation.

In addition, the present invention provides a switching function to the outside plant in a novel optical coaxial mixed network consisting of a node master, a node repeater, and a subscriber modem, thereby improving network speed, network scalability, and flexibility. It aims to secure.

In addition, an object of the present invention is to focus on the structure of the optical coaxial mixing network, so that there is no separate restriction on the signal.

In order to achieve the object of the present invention as described above, a system for providing an ultra-high speed bidirectional communication service using an optical coaxial mixed network according to the present invention includes a method for transmitting the broadcast signal when transmitting a broadcast signal through an optical coaxial mixed network. Broadcast band determining means for determining one band, and IP band determining means for determining a second band for transmitting the IP signal when the IP signal is transmitted through the optical coaxial mixed network; Is a second band having a minimum value of n among the remaining bands not determined as the first band, among the allowable bands of the optical coaxial mixed network.

Hereinafter, with reference to the accompanying drawings, a description will be given of an ultra-high speed bidirectional communication service providing system using an optical coaxial mixed network according to the present invention.

2 is a diagram showing the overall configuration of a communication service providing system according to an embodiment of the present invention.

The communication service providing system 200 may include a broadcast signal or a broadcast video signal (hereinafter referred to as a broadcast signal) received from a broadcast backbone network and an IP signal or internet signal (hereinafter referred to as an IP signal) received from an internet backbone network. In particular, the communication service providing system 200 according to the present invention transmits an IP signal through a channel in a frequency band in which the IP signal is not utilized when transmitting the broadcast signal. It serves to be transmitted to.

For example, the communication service providing system 200 of the present invention may transmit an IP signal to a subscriber end through an optical coaxial mixed network having a frequency band of 100 MHz or more that is not utilized by a broadcast signal, and coaxial with the optical coaxial mixed network. In the cable section, the IP signal can be transmitted at a high speed of 1 Gbps or more.

In this case, the communication service providing system 200 may provide an interactive Internet service between the Internet backbone network 120 and the subscriber end. Accordingly, the communication service providing system 200 of the present invention transmits the IP signal received from the subscriber end to the Internet backbone network or the HEAD END associated with the Internet backbone network using the optical coaxial mixed network of the frequency band of 100 MHz or more. Can transmit

As shown in FIG. 2, the communication service providing system 200 may include a broadcast signal transmitting device 210 for transmitting a broadcast signal and an IP signal transmitting and receiving device 220 for providing an Internet service.

The broadcast signal transmitting apparatus 210 is a device for determining a frequency band (first band) for transmitting a broadcast signal received from a broadcast backbone network and transmitting the broadcast signal to a subscriber end using an optical coaxial mixed network. The broadcast signal transmitting device 210 is composed of a broadcast band determining unit 211 and a broadcast signal transmitting unit 212.

The IP signal transmitting and receiving device 220 is a device for determining a frequency band (second band) for transmitting an IP signal, and transmitting and receiving an IP signal transmitted using an optical coaxial mixed network. The IP signal transmitting and receiving device 220 may be composed of an IP band determining means 221 and the IP signal transmitting and receiving means 222.

The broadcast band determining unit 211 determines a first band for transmitting the broadcast signal when the broadcast signal is transmitted through the optical coaxial mixed network in the communication service providing system 200. On the other hand, the IP band determining means 221 determines a second band for transmitting the IP signal when transmitting the IP signal through the optical coaxial mixed network.

In particular, the IP band determining means 221, when determining the second band, the second frequency band having a minimum value of n among the remaining bands not determined as the first band among the allowable bands of the optical coaxial mixed network. Can be determined by band.

 The n may be set to a value larger than the maximum value of the first band determined by the broadcast band determining unit 211. Hereinafter, the n specification will be based on an embodiment of setting n to at least one value of 100 MHz or more. The communication service providing system of the present invention will be described. The setting of n to at least one value of 100 MHz is attributable to the determination that the applicant of the present invention can optimally derive the effect of the present invention through many years of experience and experimentation.

For example, when the broadcast band determining means 211 determines the first band 75 to 95 MHz for transmitting a broadcast signal among the allowable bands 55 to 1000 MHz of the optical coaxial mixed network, the IP band determining means 221. The second band may determine '100 to 1000 MHz', which is greater than 95 MHz and has a minimum value of 100 MHz, among the remaining bands 55 to 74 MHz or 96 to 1000 MHz that is not determined as the first band.

3 is a diagram showing a detailed configuration of a communication service providing system according to an embodiment of the present invention.

As shown in FIG. 3, the communication service providing system 300 includes a broadcast signal transmitting apparatus 310 including a broadcast band determining unit 311 and a broadcast signal transmitting unit 312, and an IP band determining unit 321. And an IP signal transmitting and receiving device 320 including an IP signal transmitting and receiving means 322.

The description of the broadcast band determining means 311 and the IP band determining means 321 will be omitted here instead of the description of FIG. 2 described above, and the broadcast signal transmitting means 312 and the IP signal transmitting and receiving means 322 will be described below. ) Will be described in detail.

The broadcast signal transmitting means 312 transmits a broadcast signal received from the broadcast backbone network to a subscriber end connected to the broadcast backbone network and the optical coaxial mixed network through a channel using the first band determined by the broadcast band determining means 311. To be transmitted.

The broadcast signal transmitting means 312 is an optical transmitter (OTX) 313 for converting a broadcast signal received from a broadcast backbone network into an optical signal and transmitting the optical signal to an optical terminal node through an optical cable, as shown in FIG. And a downlink optical receiver 314 for converting the broadcast signal received at the terminal node into a broadcast coaxial signal, and a down amplifier 315 for amplifying the converted broadcast coaxial signal.

The IP signal transmitting and receiving means 322 is an IP signal (or Internet signal) between the Internet backbone network and the subscriber end connected to the optical coaxial mixed network through a channel using the second band determined by the IP band determining means 321. To be sent in both directions.

IP signal transmission and reception means 322 is an Ethernet switch (323) for switching one or more of the IP signal input through the determined second band to transmit to the subscriber via an optical cable, bidirectional with the Ethernet switch A node master 324 for performing communication, restoring the switched IP signal, and transmitting the same through a coaxial cable, and a node repeater for relaying the IP signal transmitted through the coaxial cable by the node master; A node repeater 325 and bi-directional communication with the node master or the node repeater, and demodulate the IP signal transmitted to the subscriber end through the coaxial cable to a computer or a setup box. It may be configured as a modem 326.

In this case, the node repeater 325 may communicate with at least one of the modem 326, the node master 324, or another node repeater 325 installed at the subscriber end along the coaxial cable.

In addition, the node repeater 325 may be installed along one or more coaxial cables based on the transmission environment of the subscriber considering the number of subscribers or transmission distance per cell.

The communication service providing system according to another embodiment of the present invention further includes orthogonal frequency division multiplexing (OFDM) modulation means for performing OFDM modulation on the IP signal transmitted in the determined second band through a coaxial cable.

That is, the OFDM modulation means serves to OFDM modulate the modulated IP signal or broadcast signal so that the IP signal or broadcast signal modulated with the coaxial signal transmitted along the coaxial cable is transmitted through giga-class communication. Each carrier of the IP signal or broadcast signal OFDM-modulated by the OFDM modulation means performs independent and variable digital modulation according to channel characteristics.

For example, the OFDM modulation means modulates the IP signal or broadcast signal with low efficiency modulation such as quadrature phase shift keying when the channel characteristics are not good, whereas 1024-QAM (Quadrature) when the channel characteristics are excellent. amplitude modulation) to modulate the IP signal or broadcast signal to enable up to 1Gbps high-speed communication.

 Accordingly, according to the present invention, since the IP signal is transmitted and received using a second band having a minimum bandwidth of 100 MHz, all carriers of OFDM may be modulated to 1024-QAM by an OFDM modulator. This ensures the physical transmission speed of IP signals up to 1Gbps or more.

In addition, according to the present invention, a stable adaptation to a coaxial channel may be possible according to the variable modulation of each carrier of OFDM.

In addition, according to the present invention, the optical and coaxial networks are separated, so that the node master and the node repeater can be flexibly designed according to the transmission requirements and the environment of the subscriber. You can extend it as well.

4 is a diagram illustrating an entire network configuration in an optical coaxial mixed network according to an embodiment of the present invention.

As shown in FIG. 4, the optical coaxial mixed network according to the present invention is connected to a broadcast backbone network 410 for transmitting a plurality of broadcast signals and an Internet backbone network 420 for transmitting and receiving IP signals, thereby providing a broadcast signal and IP. It consists of optical network and coaxial network that transmit signals simultaneously.

HEAD END (national company) 430 is an OTX (optical transmitter) 431 for converting a plurality of broadcast signals to a broadcast optical signal, switching or routing a plurality of IP signals, and optical signals to electrical signals (photoelectric), Alternatively, the switch may be configured as an Ethernet switch 432 for converting an electric signal into an optical signal (all-optical), and is connected to an optical node 450 through an optical cable 440.

The optical terminal node 450 includes a downlink receiver 451 for photoelectric conversion of the broadcast optical signal, a down amplifier 452 for amplifying the signal, a combiner 453 for performing signal combining and separation, and a coaxial cable 460. According to the present invention, the IP signal transmitted / received may be configured as a node master 454 for converting or converting an IP signal into a coaxial signal or inversely converting the coaxial signal into an IP signal. It is connected to a plurality of coaxial node 470 through the 460.

The coaxial terminal node 470 includes a down amplifier 472 for amplifying the attenuated broadcast signal transmitted along the coaxial cable 460, a node repeater 474 for relaying the attenuated IP signal, and separation of signals. And two combiners 471 and 473 performing the combining, and the signal of the coaxial terminal node 470 is connected to each subscriber via a plurality of taps (TO, Tap-off).

The subscriber station 480 may be configured as a modem 482 for transmitting and receiving an IP signal with a TV terminal 481 receiving a broadcast.

By the broadcast signal transmitting means 312 including the optical transmitter (OTX) 431, the downlink optical receiver 451, and the down amplifier 452 shown in FIG. 4, the broadcast signal is transmitted through the channel of the first band. The process transmitted to the subscriber will be described below.

The broadcast signal transmitting means 312 converts the broadcast video signal received from the broadcast backbone network 410 through an optical transmitter (OTX) 431 in the HEAD END 430, and converts the optical signal converted along the optical cable. The signal is transmitted to an outdoor fiber node 450.

In addition, the broadcast signal transmitting means 312 converts the optical signal received through the downlink optical receiver 451 in the optical terminal node 450 into a coaxial signal and amplifies it through the downlink amplifier 452, and combines the combiner 453. Combine up and down coaxial signals. Thereafter, the broadcast signal transmitting means 312 transmits the up and down coaxial signals to the coaxial node 470 installed along the coaxial cable 460.

In addition, the broadcast signal transmitting means 312 separates the up and down coaxial signal through the combiner 471 in the coaxial terminal node 470, amplified by the down amplifier 472, and up and down coaxial through the combiner 473 The signals are combined and transmitted along the coaxial cable 460 to the TV receiver 481 of the subscriber station 480.

The IP signal transmission / reception means 312 including the Ethernet switch 432, the node master 454, the node repeater 474, and the modem 482 shown in FIG. The process of transmitting to the subscriber through the channel of the second band determined in) will be described below.

The IP signal transmitting and receiving means 312 switches and routes the IP signal transmitted and received from the Internet backbone network 420 by the Ethernet switch 432, and then performs all-optical or photoelectric conversion, and the optical terminal node 450 through the optical cable 440. To pass.

In addition, the IP signal transmission and reception means 312 is a photoelectric or all-optical conversion, and after switching the optical signal transmitted and received by the node master 454 in the optical terminal node 450 converts into a coaxial signal to transmit and receive to the coaxial network.

Thereafter, the IP signal transmission and reception means 312 recovers and retransmits the signal transmitted through the coaxial cable 460 through the node repeater 474 in the coaxial terminal node 470. Accordingly, the IP signal transmission / reception means 312 enables the long-distance communication by passing the IP signal through the plurality of node repeaters 474.

In addition, the IP signal transmitting and receiving means 312 is a device such as a PC or a set top box (STB) when the transmitted signal is converted into a general Ethernet signal (or base signal) through the modem 482 of the subscriber end 480 Internet service will be provided through

At this time, in the optical cable 440 section between the Ethernet switch 432 and the optical terminal node 450 in the HEAD END (430), the conventional IEEE 802.3z-based giga-class communication is performed, or wavelength division multiplexing (WDM) Handwritten communication may be provided based on the technology.

According to an embodiment of the present invention, in the coaxial cable 460 section (coaxial section) between the node master 454, the node repeater 474, and the modem 482, a broadcast signal of 55 to 1000 MHz is used. Over 100 MHz band, which is not used, enables high-speed bidirectional communication.

5 is a diagram illustrating a configuration of a node master included in an optical terminal node according to an embodiment of the present invention.

The node master 500 included in the optical terminal node communicates with a modem installed at the subscriber end or a node repeater included in the coaxial terminal node, and coaxially transmits and receives an IP signal transmitted and received along the coaxial cable 555. Convert or invert the signal. Here, inverse conversion may refer to a process of converting a coaxial signal into an IP signal when the uplink signal from the subscriber end.

As shown in FIG. 5, the node master 500 according to an exemplary embodiment of the present invention may include a photoelectric / optical converter 510, an L2 switch 520, a MAC processor 530, a downlink signal transmitter 540, and a vertical downlink. A combiner 550 and an uplink signal receiver 560.

The photoelectric / electric converter 510 performs bidirectional communication through an Ethernet switch and an optical cable 515 and supports 1.25 Gbps high speed optical communication based on IEEE 802.3z.

The L2 switch 520 switches signals (or data) of a plurality of upper and lower MAC processors 530 and maintains a network, and is driven based on an Ethernet protocol.

The MAC processor 530 is connected to a plurality of modems and node repeaters at the subscriber end through the downlink signal transmitter 540 and the uplink signal receiver 560 to prevent data collision in communication and to implement a protocol based on a variable time division scheme. By supporting it, it maintains efficient IP signal transmission.

The downlink signal transmitter 540 converts the data received through the MAC processor 530 into a downlink coaxial signal that can be coaxially transmitted. In this case, the downlink coaxial signal occupies a band of 100 MHz or more of the 55 ~ 1000 MHz band, based on the adaptive OFDM technology.

The uplink signal receiver 560 converts the uplink coaxial signal transmitted from the modem of the subscriber end into a baseband digital signal and transmits the uplink coaxial signal to the MAC processor 530.

The up and down combiner 550 combines or separates up or down coaxial signals.

6 is a diagram illustrating a configuration of a node repeater included in a coaxial terminal node according to an embodiment of the present invention.

The node repeater 600 included in the coaxial terminal node performs end-to-end communication with other node repeaters or node masters with the coaxial signal input and output through the input coaxial cable 615. In addition, the node repeater 600 may communicate the coaxial signals input and output through the output coaxial cable 695 with a plurality of modems at the bottom. In addition, the node repeater 600 may relay (or recover) the signal attenuated and transmitted along the coaxial cable 460 and retransmit.

Therefore, according to the present invention, the signal is converted into a form in which a long distance communication is possible while passing through the plurality of node repeaters 474.

The node repeater 600 according to an embodiment of the present invention includes two up / down combiners 610 and 690, a downlink signal receiver 620, an uplink signal transmitter 630, two MAC processors 640 and 660, and an L2 switch. 650, the downlink signal transmitter 670, and the uplink signal receiver 680.

The two up and down combiners 610 and 690 combine or separate up or down coaxial signals, and the downlink signal receiver 620 demodulates the coaxial signal received through the input coaxial cable 615 from the node master into an IP signal. The uplink signal transmitter 630 modulates the IP signal transmitted from the MAC processor 640 into a signal that can be transmitted through a coaxial cable.

In addition, the two MAC processors 640 and 660 perform transmission and reception of the IP signal according to management information of the node master, the L2 switch 650 performs switching of a plurality of IP signals, and the downlink signal transmitter 670. Modulates the IP signal demodulated by the downlink signal receiver 620 into a signal (coaxial signal) that can be transmitted through a coaxial cable (output), and the uplink signal receiver 680 modulates the signal received through the output coaxial cable 695. Demodulated coaxial signal into an IP signal.

7 is a diagram illustrating a configuration of a modem included in a subscriber station according to an embodiment of the present invention.

The modem 700 installed at the subscriber end converts a signal transmitted along a coaxial cable into a general Ethernet signal (or base signal), and then connects a device such as a personal computer (PC) or a set top box (STB). To provide Internet services.

Modem 700 according to an embodiment of the present invention, such as up and down coupler 710, downlink signal receiver 720, uplink signal transmitter 730, MAC processor 740, and Ethernet PHY and RJ45 (750) It consists of an Ethernet interface.

The up and down combiner 710 separates and combines the downlink signal and the uplink signal in the 55 to 1000 MHz band to enable the bidirectional Internet service.

In addition, the downlink signal receiver 720 converts the received downlink coaxial signal into a base signal (IP signal) and transmits the same to the MAC processor 740, and the uplink signal transmitter 730 is transferred from the MAC processor 740. The base signal is converted into an uplink signal and transmitted to the node master or the node repeater through the up / down coupling unit 710.

In this case, the uplink signal and the downlink signal occupy a band of 100 MHz or more in the 55 ~ 1000 MHz band, and is based on the adaptive OFDM technology.

In addition, the MAC processor 740 switches the base signal and manages the transmission and reception of the IP signal by exchanging control signals with the node master. That is, the MAC processor 740 may transmit data in a specific time zone given according to the instruction of the node master, and periodically manages node master information such as the amount of data to be transmitted, the state of the modem, and additional function information. Can be used to maximize the efficiency of end-to-many communications.

In addition, the MAC processor 740 is connected to the UTP 755 and a device such as a PC or STB through an Ethernet interface such as the Ethernet PHY and RJ45 (750).

8 is a diagram showing the configuration of the IP signal transmission and reception means in the communication service providing system according to an embodiment of the present invention.

As shown in FIG. 8, the IP signal transmitting and receiving means 800 includes an Ethernet switch 810, a node master 820, a node repeater 830, and a modem 840.

The IP signal transmitting and receiving means 800 serves to transmit an IP signal to an indoor terminal such as a TV, a PC, and a telephone through a channel of the second band determined by the IP band determining means.

The Ethernet switch 810 may transmit / receive with an Internet network such as a PSTN, the Internet, and a VoD server, and the node master 820 may communicate with the Ethernet switch 810 bidirectionally, with the node repeater 830 at the bottom, and a modem. Manage communication with 840.

In this case, the node repeater 830 may communicate with at least one of the modem 840, the node master 820, or another node repeater 830 installed at the subscriber end along the coaxial cable.

In addition, the node repeater 830 may be installed along one or more coaxial cables based on the subscriber's transmission environment in consideration of the number of subscribers or transmission distance per cell.

According to an embodiment of the present invention, the protocol may be driven in two modes: end-to-end communication between the node master and the node repeater, and end-to-end communication between the node master or the node repeater and a plurality of modems.

First of all, the protocol of end-to-end communication is related to a communication method that can be used when the node master and one node repeater are connected, and enables independent communication in both directions. If connected, switch the end-to-many communication.

The protocol of end-to-many communication is related to the case where the downlink signal originating from the node master arrives at multiple modems at the same time or in similar time zones, and is determined by the MAC processor in each modem to determine whether the signal is its own. Can be.

However, since an uplink signal originating from a plurality of modems arrives at an uplink signal receiver in one node master or node repeater along a coaxial network, which is the same transmission medium, there is a concern that data collisions may occur. In order to prevent this, the node master grasps time delay information, transmission data amount and channel characteristics of each modem and allocates a specific time band to each modem to be operated, and the modem transmits data within the allocated time. At this time, since the transmission time can be actively changed according to the amount of data to be sent, the efficiency of the network can be improved.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

As can be seen from the above description, according to the present invention, it is possible to provide a giga-class high-speed Internet service as well as a conventional broadcast video service by applying an existing optical coaxial mixed network. That is, according to the present invention, high-speed transmission of 1 Gbps or more is possible using a frequency band of 100 MHz or more.

In addition, according to the present invention, due to the advantage of the adaptive OFDM technology, it is possible to actively adapt to the coaxial channel of the up and down signal transceiver.

In addition, according to the present invention, full-duplex transmission is possible according to uplink and downlink signal separation.

In addition, according to the present invention, by providing a switching function to the outside plant in a new optical coaxial mixed network consisting of a node master, a node repeater, and a subscriber modem, network speed, network scalability and Flexibility can be secured.

In addition, according to the present invention, by focusing on the structure of the optical coaxial mixing network, there is no separate restriction on the signal.

Claims (8)

In the communication service providing system, Broadcast band determining means for determining a first band for transmitting the broadcast signal when transmitting a broadcast signal through an optical coaxial mixed network; And An IP band determining means for determining a second band for transmitting the IP signal when the IP signal is transmitted through the optical coaxial mixed network, The IP band determining means, Among the allowable bands of the optical coaxial mixed network, among the remaining bands not determined as the first band, And a second band having a minimum value of n, which is greater than the maximum value of the determined first band, as the minimum value. 2. delete The method of claim 1, The IP band determining means, Ultra fast bidirectional communication service providing system using an optical coaxial mixed network, characterized in that for setting the n to a value of 100 MHz or more. The method of claim 1, IP signal transmission and reception means for transmitting the IP signal in both directions between a subscriber station connected to the Internet backbone network and the optical coaxial mixed network through a channel using the determined second band. Ultra-high speed two-way communication service providing system using an optical coaxial mixed network further comprising. The method of claim 1, An Ethernet switch for switching one or more of the IP signals input through the determined second band to be transmitted through an optical cable; A node master for performing bidirectional communication with the Ethernet switch, restoring the switched IP signal, and transmitting the same through a coaxial cable; And Node repeater for relaying the IP signal transmitted through the coaxial cable by the node master to the modem of the subscriber end Ultra-high speed two-way communication service providing system using an optical coaxial mixed network further comprising. The method of claim 5, The node repeater, System for providing high-speed bidirectional communication service using an optical coaxial mixed network, characterized in that installed at least one along the coaxial cable based on the subscriber's transmission environment considering the number of subscribers or transmission distance per cell. The method of claim 5, The node repeater, And providing communication with at least one of the modem, the node master, or another node repeater installed at a subscriber end via the coaxial cable. The method of claim 1, OFDM modulation means for performing OFDM modulation on the IP signal transmitted in the determined second band via a coaxial cable Ultra-high speed two-way communication service providing system using an optical coaxial mixed network further comprising.

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