WO2014079044A1 - Procédé, appareil et système de communication pour réseau hfc - Google Patents

Procédé, appareil et système de communication pour réseau hfc Download PDF

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Publication number
WO2014079044A1
WO2014079044A1 PCT/CN2012/085166 CN2012085166W WO2014079044A1 WO 2014079044 A1 WO2014079044 A1 WO 2014079044A1 CN 2012085166 W CN2012085166 W CN 2012085166W WO 2014079044 A1 WO2014079044 A1 WO 2014079044A1
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WO
WIPO (PCT)
Prior art keywords
cmc
olt
serial data
frame
data
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PCT/CN2012/085166
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English (en)
Chinese (zh)
Inventor
林华枫
徐之光
隋猛
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2012/085166 priority Critical patent/WO2014079044A1/fr
Priority to CN201280019214.2A priority patent/CN103999380B/zh
Publication of WO2014079044A1 publication Critical patent/WO2014079044A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communication method, apparatus, and system for an HFC network. Background technique
  • the current broadband access network there are mainly three access technologies. The first is based on twisted pair DSL (Digital Subscriber Loop), the second is based on fiber optic PON (Passive Optical Network), and the third is based on HFC (Hybrid Fiber Coaxial, Cable Modem (Cable Network Modulation) technology for fiber optic and coaxial cable hybrid networks.
  • the current cable TV service uses the HFC network, and has already penetrated into thousands of households.
  • the use of HFC networks to achieve broadband access is a relatively simple and economical solution.
  • Optical Line Terminal is a network-side forwarding device that communicates with multiple CMCs (Coax Media Converters) at the far end in a point-to-multipoint communication manner.
  • CMCs Coax Media Converters
  • Each CMC and multiple CMCs The terminals on the user side (ie, the CNU (Coax Network Unit) in the figure) communicate by means of point-to-multipoint communication.
  • the network architecture borrowing from the EPON mechanism improves the system bandwidth to some extent.
  • an embodiment of the present invention provides a communication method, apparatus, and system for an HFC network to improve user bandwidth under an HFC network architecture.
  • the technical solution is as follows:
  • a communication method of an HFC network is provided, which is applied to an HFC network including an OLT and a plurality of CMCs, wherein the OLT is connected to multiple CMCs, and the CMC is connected to the terminal, and the method includes:
  • the OLTs respectively set working wavelengths corresponding to the CMCs, and the working wavelengths corresponding to the CMCs are different;
  • the OLT When the OLT sends information to the CMC, the OLT converts an electrical signal sent to each CMC into a light wave corresponding to the working wavelength, and transmits each optical wave to the corresponding CMC;
  • the OLT When the OLT receives the information sent by the CMC, the OLT receives the light wave corresponding to the working wavelength sent by each CMC, and converts the received light waves into electrical signals for processing.
  • the OLT is respectively provided with a CMTS corresponding to each CMC;
  • the OLT converts the electrical signal sent to each CMC into a light wave corresponding to the working wavelength, specifically: the OLT transmits an electrical signal through each CMTS, and respectively converts the electrical signals emitted by each CMTS into light waves corresponding to the working wavelength;
  • the OLT converts the received optical waves into electrical signals for processing. Specifically, the OLT converts the received optical waves into electrical signals, and respectively processes the electrical signals through the corresponding CMTS.
  • the OLT transmits an electrical signal through each CMTS, and respectively converts the electrical signals transmitted by the CMTS into optical waves corresponding to the working wavelength, specifically: the OLT transmits a parallel data signal carried by the electrical signals through each CMTS; the OLT respectively The parallel data signals transmitted by the CMTSs are converted into serial data signals; the OLT respectively converts each serial data signal into light waves corresponding to the working wavelength; the OLT converts the received light waves into electrical signals, and respectively responds
  • the CMTS processes each electrical signal, specifically: the OLT converts each received optical wave into a serial data signal carried by the electrical signal; the OLT respectively converts each serial data signal into a parallel data signal; The OLT processes each parallel data signal through a corresponding CMTS.
  • Converting the parallel data signal into a serial data signal is specifically: Obtaining data on each carrier of the parallel data signal;
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • a communication method of an HFC network is provided, which is applied to an HFC network including an OLT and a plurality of CMCs, wherein the OLT is connected to a plurality of CMCs respectively, and the CMC is connected to the terminal, and the method includes:
  • Each CMC is respectively provided with a corresponding working wavelength, and the working wavelengths corresponding to the CMCs are different; when the CMC sends information to the OLT, the electrical signals sent to the OLT are converted into light waves corresponding to the working wavelength, and Transmitting the light wave to the OLT;
  • the optical wave sent by the OLT is received at a corresponding working wavelength, and the received optical wave is converted into an electrical signal and sent to the terminal.
  • the CMC converts the electrical signal sent to the OLT into a light wave corresponding to the working wavelength, specifically: the CMC converts the parallel data signal carried by the electrical signal sent to the OLT into a serial data signal; Converting the converted serial data signal into a light wave corresponding to the working wavelength; the CMC converts the received light wave into an electrical signal and sends the signal to the terminal, specifically: the CMC converts the received light wave into an electrical signal carrying a serial data signal; the CMC converts the serial data signal into a parallel data signal for transmission to a terminal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • an OLT is provided, which is applied to an HFC network including an OLT and multiple CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal, and the OLT includes:
  • a setting module configured to respectively set an operating wavelength corresponding to each CMC, and the working wavelengths corresponding to the CMCs are different;
  • a communication module configured to: when transmitting information to the CMC, convert an electrical signal sent to each CMC into a light wave corresponding to the working wavelength, and send each optical wave to a corresponding CMC; when receiving the information sent by the CMC, The light waves corresponding to the working wavelengths transmitted by the respective CMCs are received, and the received light waves are converted into electrical signals for processing.
  • the OLT is respectively provided with a CMTS corresponding to each CMC;
  • the communication module is specifically configured to: when transmitting information to the CMC, transmit an electrical signal through each CMTS, and respectively convert an electrical signal transmitted by each CMTS into a light wave corresponding to a working wavelength; and receive information sent by the CMC At the same time, each received light wave is converted into an electrical signal, and each electrical signal is processed by a corresponding CMTS.
  • the communication module is specifically configured to:
  • the CMTS processes each parallel data signal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • a CMC which is applied to an HFC network including an OLT and a plurality of CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal, and the CMC includes:
  • a setting module configured to set a working wavelength corresponding to the CMC, where the working wavelengths of the CMCs are different;
  • a communication module configured to: when transmitting information to the OLT, convert an electrical signal sent to the OLT into a light wave corresponding to a working wavelength, and send the optical wave to the OLT; and receive information sent by the OLT Receiving, by the corresponding working wavelength, the light wave sent by the OLT, and converting the received light wave into an electrical signal and transmitting the signal to the terminal.
  • the communication module is specifically configured to:
  • the OLT When receiving the information sent by the OLT, converting the received light wave into a string carried by the electrical signal A row data signal; the serial data signal is converted into a parallel data signal and transmitted to the terminal.
  • the serial data signal is converted into a parallel data signal and transmitted to the terminal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • a communication system of an HFC network including an OLT and a plurality of CMCs, wherein the OLTs are respectively connected to a plurality of CMCs, and the CMCs are connected to the terminals, wherein:
  • the OLT is configured to respectively set an operating wavelength corresponding to each CMC, and the working wavelengths corresponding to the CMCs are different; when the information is sent to the CMC, the electrical signals sent to the CMCs are converted into corresponding working wavelengths.
  • the light wave is sent to the corresponding CMC; when receiving the information sent by the CMC, the light wave corresponding to the working wavelength transmitted by each CMC is received, and the received light waves are converted into electrical signals for processing.
  • the CMC is configured to set an operating wavelength corresponding to the CMC; when transmitting information to the OLT, converting an electrical signal sent to the OLT into a light wave corresponding to the working wavelength, and transmitting the optical wave to the
  • the OLT receives the information sent by the OLT, receives the optical wave sent by the OLT at a corresponding working wavelength, and converts the received optical wave into an electrical signal and sends the received signal to the terminal.
  • the OLT is respectively provided with a CMTS corresponding to each CMC;
  • the OLT is specifically configured to: when transmitting information to the CMC, transmit an electrical signal through each CMTS, and respectively convert an electrical signal transmitted by each CMTS into a light wave corresponding to the working wavelength; when receiving the information sent by the CMC , converting each received light wave into an electrical signal, and respectively passing corresponding The CMTS processes each electrical signal.
  • the OLT is specifically configured to: when transmitting information to the CMC, transmit parallel data signals carried by the electrical signals by using the CMTS; respectively convert the parallel data signals transmitted by the CMTS into serial data signals; respectively Converting the data signal into a light wave corresponding to the working wavelength; when receiving the information sent by the CMC, converting the received light wave into a serial data signal carried by the electrical signal; respectively converting each serial data signal into a parallel data signal; Processing each parallel data signal through a corresponding CMTS;
  • the CMC is specifically configured to: when transmitting information to the OLT, convert a parallel data signal carried by an electrical signal sent to the OLT into a serial data signal; convert the converted serial data signal into a corresponding work a light wave of a wavelength; when receiving the information transmitted by the OLT, converting the received light wave into a serial data signal carried by the electrical signal; converting the serial data signal into a parallel data signal and transmitting the data to the terminal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • the technical solution provided by the embodiment of the present invention has the beneficial effects that: when the OLT communicates with multiple CMCs, the peer-to-peer communication mode is adopted, so that each CMC can use the entire system bandwidth, and each CMC connected terminal shares the system bandwidth and improves.
  • the user bandwidth under the HFC network architecture, and the technical solution can be implemented without modifying the terminal in the traditional HFC network architecture, so
  • the traditional HFC network architecture is modified by using the technical solution of the embodiment of the present invention, the original equipment can be reused better, and the transformation cost is reduced.
  • FIG. 1 is a schematic diagram of an EPON-based HFC network architecture in the prior art
  • FIG. 2 is a schematic flowchart of a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 4 is a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an architecture of an HFC network according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a method for converting a parallel data signal into a serial data signal according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a method for converting a serial data signal into a parallel data signal according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a format of a signal received by a CNU in a communication method of an HFC network according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 11 is a schematic flowchart of a communication method of an HFC network according to an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram of an OLT according to an embodiment of the present invention
  • FIG. 13 is a schematic structural diagram of a CMC according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a communication system of an HFC network according to an embodiment of the present invention. detailed description
  • Embodiment 1 The communication method of the HFC network provided by the embodiment of the present invention is applied to an HFC network including an OLT and multiple CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal.
  • the OLT sets an operating wavelength corresponding to each CMC, and the operating wavelengths corresponding to the CMCs are different.
  • the process of sending information to the CMC by the OLT may be as shown in FIG. 2, and specifically includes the following steps:
  • Step 201 The OLT converts the electrical signal sent to each CMC into a light wave corresponding to the working wavelength.
  • the process of the OLT receiving the information sent by the CMC specifically includes the following steps: Step 301: The OLT receives the optical wave of the corresponding working wavelength sent by each CMC.
  • Step 302 The OLT converts each received light wave into an electrical signal for processing.
  • the OLT communicates with different CMCs through optical waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • the communication method of the HFC network provided by the embodiment of the present invention is applied to an HFC network including an OLT and multiple CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal.
  • each CMC is respectively provided with a corresponding working wavelength, and the working wavelengths corresponding to the CMCs are different.
  • the process of sending information to the OLT by the CMC may be as follows: Step 401: The CMC converts the electrical signal sent to the OLT into a light wave corresponding to the working wavelength.
  • Step 402 The CMC sends the light wave to the OLT.
  • Step 501 The CMC receives the optical wave sent by the OLT at the corresponding working wavelength.
  • Step 502 The CMC converts the received light wave into an electrical signal and sends the signal to the terminal.
  • each CMC communicates with the OLT through light waves of different working wavelengths, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • Embodiment 3 The communication method of the HFC network provided by the embodiment of the present invention is applied to an HFC network including an OLT and multiple CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal.
  • each CMC can be connected to multiple terminals (CNU), and the communication between the CMC and the CNU can generally be a point-to-multipoint communication method.
  • the OLT sets an operating wavelength corresponding to each CMC (the working wavelength is the wavelength of the carrier used by the optical wave signal), and the working wavelengths corresponding to the CMCs are different.
  • the working wavelengths are different. Therefore, the communication channel between the OLT and each CMC does not interfere with each other, and the wavelength resources can be fully utilized to increase the system bandwidth.
  • the flow of the OLT sending information to the CMC (the flow in FIG. 2) in the communication method of the HFC network provided by the embodiment of the present invention is described in detail below.
  • the process specifically includes the following steps:
  • Step 201 The OLT converts the electrical signal sent to each CMC into a light wave corresponding to the working wavelength.
  • One or more CMTS can be set in the OLT.
  • the CMTS can process (generally perform forwarding processing) data that communicates with multiple CNUs.
  • the CMTS can handle data that communicates with all CNUs.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present disclosure.
  • a plurality of CMTSs may be set in the OLT, and each CMTS may correspond to one CMC, that is, information sent by each CMTS processor to the CNU connected to the CMC corresponding to the CMTS, and received from
  • the information sent by the CMC is such that, in the OLT, the correspondence between the CMTS, the CMC, and the operating wavelength is established.
  • the OLT can transmit electrical signals through the CMTSs and convert the electrical signals transmitted by the respective CMTSs into light waves corresponding to the working wavelengths.
  • the OLT transmits a parallel data signal carried by the electrical signal through each CMTS.
  • the CMTS can process the data of the CNU communication with its corresponding CMC connection.
  • the data can be carried by carriers of different frequency bands.
  • different data of the same CNU can also be carried on carriers of different frequency bands, and Different time slots can be used on the carrier to carry different CNU data or different data of the same CNU.
  • the data signal carried by the CMTS through the multi-carrier is a parallel data signal, and the signal is generally an electrical signal.
  • the OLT converts the parallel data signals transmitted by the respective CMTS into serial data signals, respectively.
  • a parallel serial data conversion device can be provided for each CMC for performing mutual conversion of the parallel data signal and the serial data signal.
  • the parallel serial data conversion device can be connected to the CMTS through a circuit, and the conversion performed here is a conversion between the electrical signal and the electrical signal, that is, the parallel data signal and the serial data signal before and after the conversion are carried by the electrical signal.
  • the data in the parallel data signal is generally a data block carried on each time slot of each carrier, each data block may be data sent to each CNU in each time slot, and the data in the serial data signal is continuous data, such as As shown in FIG. 7, the process of converting a parallel data signal into a serial data signal may be: acquiring data on each carrier of the parallel data signal; adding a frame header to the data front end of each carrier, ending with a frame Tail, and write the carrier identifier of the corresponding carrier in the frame header to obtain a serial data frame; if the data on the acquired carrier includes data blocks of multiple time slots, it further includes adding a predetermined padding between each data block. Data; each serial data frame obtained constitutes a serial data signal.
  • the data on each carrier of the parallel data signal may be acquired according to a preset period, and the data acquired on each carrier is used as a frame, and a frame header is added before the data, and a frame is added at the end of the data.
  • the data on the acquired carrier includes data blocks of multiple time slots, it is also possible to add predetermined data (for example, 110110, etc.) between the data blocks as padding data (this padding data serves as a labeling function, It is used to distinguish the data blocks before and after.
  • predetermined data for example, 110110, etc.
  • this padding data serves as a labeling function, It is used to distinguish the data blocks before and after.
  • the data on the acquired carrier only includes the data block of one time slot, there is no need to increase the padding data, so that the data on each carrier is converted into a continuous serial data frame.
  • the channel number of the carrier can be recorded in the frame header, and each serial data frame can be arranged in order to form a serial data signal.
  • the OLT converts each serial data signal into a light wave corresponding to the working wavelength.
  • the emission wavelength is the wavelength of the carrier used by the optical module to transmit the optical wave signal
  • the emission wavelengths of the optical modules of the optical module respectively For each of the above operating wavelengths, it is used to transmit light waves of different wavelengths and to convert photoelectric signals.
  • the optical module is connected to the parallel serial data conversion device through a circuit to transmit a serial data signal. In this way, the correspondence between the CMTS, the parallel serial data conversion device, the optical module, the CMC, and the operating wavelength is established.
  • the serial data signal is sent to the optical module, converted into light waves of the corresponding working wavelength and transmitted to the corresponding CMC.
  • Step 202 The OLT sends each light wave to the corresponding CMC.
  • the OLT may be configured with a wavelength division multiplexing demultiplexer for collecting optical waves of different working wavelengths emitted by the respective optical modules onto the backbone optical fiber, transmitting to the remote CMC, or transmitting the collected optical waves to the CMC side.
  • the light waves are decomposed into multiple different working wavelengths and sent to the corresponding optical modules.
  • the wavelength division multiplexing demultiplexer is connected to each optical module through an optical fiber.
  • a wavelength division multiplexing demultiplexer can also be set on the CMC side, which corresponds to the wavelength division multiplexing demultiplexer on the OLT side.
  • the OLT receives the CMC transmission in the communication method of the HFC network provided by the embodiment of the present invention.
  • the flow of the information (the flow in FIG. 3) is described in detail.
  • the flow specifically includes the following steps: Step 301:
  • the OLT receives the light wave of the corresponding working wavelength sent by each CMC.
  • each CMTS can be respectively connected with a parallel serial data conversion device, and each parallel serial data conversion device can be respectively connected with optical modules of different emission wavelengths, and the emission wavelengths of the respective optical modules are respectively for the work of each CMC.
  • the wavelength, which establishes the correspondence between the CMTS, the parallel serial data conversion device, the optical module, the CMC, and the operating wavelength here, the OLT is provided with multiple CMTSs).
  • the OLT can decompose the optical wave sent by the CMC through the backbone fiber into multiple optical waves of different working wavelengths through the wavelength division multiplexing demultiplexer, and send them to the corresponding optical modules.
  • Step 302 The OLT converts each received light wave into an electrical signal for processing.
  • the OLT converts each received optical wave into an electrical signal, and processes each electrical signal through a corresponding CMTS.
  • the OLT converts each received optical wave into a serial data signal carried by the electrical signal.
  • Each optical module converts the received light wave into an electrical signal, and the optical wave carries a serial data signal. After being converted into an electrical signal, the serial data signal is still carried.
  • the OLT then converts each serial data signal into a parallel data signal.
  • Each optical module sends the converted electrical signal to a corresponding parallel serial data conversion device to convert the serial data signal into a parallel data signal.
  • the specific conversion process may be: acquiring each serial data in the serial data signal a frame; determining, according to a carrier identifier in a frame header of each serial data frame, a carrier corresponding to each data block in the serial data frame; deleting a frame header, a frame tail, and padding data of each serial data frame, and acquiring the serial data
  • Each data block in the frame; each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • the frame header of each serial data frame is parsed, and the carrier identifier carried in the carrier is obtained and recorded.
  • the carrier identifier may be a channel number of the carrier, and the carrier corresponding to the serial data frame may be found according to the channel number in the frame header, and then
  • the frame header, the end of the frame and the padding data of each serial data frame can be deleted to obtain the data blocks therein, and each data block has its own time slot corresponding to each other, and each data block can be re-borne in the corresponding channel according to the channel number.
  • a parallel data signal is obtained in each time slot on the carrier.
  • the OLT processes each parallel data signal through a corresponding CMTS.
  • the parallel serial data conversion device transmits the parallel data signal to its connected CMTS, and the parallel data signal is processed by the CMTS (e.g., forwarding processing).
  • the OLT communicates with different CMCs through light waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can Using the entire system bandwidth, each CMC-connected terminal shares the system bandwidth and improves the user bandwidth under the HFC network architecture.
  • the technical solution can be implemented without modifying the terminal under the traditional HFC network architecture, so The HFC network architecture adopting the EPON mechanism in the prior art can re-use the original equipment and reduce the transformation cost when the traditional HFC network architecture is modified by using the technical solution of the embodiment of the present invention.
  • Embodiment 4 Embodiment 4
  • the communication method of the HFC network provided by the embodiment of the present invention is applied to an HFC network including an OLT and multiple CMCs, where the OLT is connected to multiple CMCs, and the CMC is connected to the terminal. As shown in the figure, each CMC can be connected to multiple terminals (CNU).
  • the communication between CMC and CNU generally uses point-to-multipoint communication.
  • each CMC is respectively provided with a corresponding working wavelength, and the working wavelengths corresponding to the CMCs are different, so the communication channel between the OLT and each CMC does not interfere with each other, and the wavelength resources can be fully utilized, and the system can be improved. bandwidth.
  • the OLT can also record the working wavelength of each CMC.
  • Step 401 The CMC converts the electrical signal sent to the OLT into a light wave corresponding to the working wavelength.
  • the CMC converts the parallel data signal carried by the electrical signal sent to the OLT into a serial data signal.
  • the CMC is provided with a Coax TRx (coaxial transceiver), which performs point-to-multipoint communication with multiple CNUs through a coaxial transceiver, and the coaxial transceiver is connected to multiple CNUs through coaxial cables.
  • the electrical signal from the CNU is received, and the parallel data signals of the multi-carrier divided into multiple time slots transmitted by each CNU are demodulated.
  • the CMC can also be provided with a parallel serial data conversion device connected to the coaxial transceiver, and the coaxial transceiver transmits the parallel data signal to the parallel serial data conversion device, converts to a serial data signal, and converts the parallel data signals before and after the conversion. And serial data signals are carried by electrical signals.
  • the specific conversion process can be seen in the third embodiment.
  • the CMC then converts the converted serial data signal into a light wave corresponding to the operating wavelength.
  • An optical module can also be set on the CMC for transmitting and receiving light waves of its working wavelength, and Conversion of photoelectric signals.
  • the optical module is connected to the parallel serial data conversion device, receives the serial data signal transmitted by the parallel serial data conversion device, and converts the electrical signal into a light wave of its working wavelength.
  • Step 402 The CMC sends the light wave to the OLT.
  • a wavelength division multiplexing demultiplexer may be configured to aggregate the optical waves of different working wavelengths emitted by the optical modules of each CMC onto the backbone optical fiber, send them to the OLT, or decompose the collected optical waves sent by the OLT into multiple Light waves of different working wavelengths are sent to the corresponding CMC optical modules.
  • the wavelength division multiplexing demultiplexer is connected through an optical fiber and an optical module.
  • the flow of the CMC receiving the information sent by the OLT (the flow in FIG. 5) in the communication method of the HFC network provided by the embodiment of the present invention is described in detail.
  • the CMC receives the information sent by the OLT and the OLT sends the information to the CMC in the third embodiment.
  • the corresponding process may include the following steps:
  • Step 501 The CMC receives the light wave sent by the OLT at a corresponding working wavelength.
  • the optical wave transmitted by the OLT through the trunk optical fiber can be received by the wavelength division multiplexing demultiplexer, and then decomposed into multiple optical waves of different working wavelengths, and sent to the CMC corresponding to each working wavelength.
  • a corresponding optical module is disposed in the CMC, and the optical wave of the working wavelength thereof can be received, and the optical module and the wavelength division multiplexing demultiplexer are connected through the optical fiber.
  • Step 502 The CMC converts the received light wave into an electrical signal and sends the signal to the terminal.
  • the CMC converts the received light wave into a serial data signal carried by the electrical signal.
  • the optical wave received by the optical module is converted into an electrical signal, which is sent by the OLT.
  • the optical wave carries a serial data signal, and after being photoelectrically converted, the converted electric energy is converted.
  • the signal still carries the serial data signal.
  • the optical module sends this serial data signal to the parallel serial data conversion device.
  • the CMC then converts the serial data signal into a parallel data signal for transmission to the terminal.
  • the parallel serial data conversion device After receiving the serial data signal, the parallel serial data conversion device converts the serial data signal into a parallel data signal, corresponding to FIG. 7, and FIG. 8 is a schematic diagram of the serial data signal converted into a parallel data signal, and the specific conversion processing The process can be seen in the third embodiment.
  • the parallel serial data conversion device then transmits the parallel data signal carried by the electrical signal to the coaxial transceiver, and the coaxial transceiver transmits the data to the transmission format of the coaxial cable, and transmits the data to the CMC connection through the coaxial cable.
  • the CNU can be specifically transmitted in the form of multi-carrier slotted broadcast.
  • the format of the signal received by CNU can be as shown in Figure 9.
  • the converted parallel data signal is obtained.
  • the order of the carriers in the parallel data signal sent by the original CMTS is maintained. Therefore, the parallel data signal received by the coaxial transceiver is the parallel data signal sent by the CMTS (see FIGS. 7 and 8). It can be seen that in this process of sending and receiving, no protocol conversion is required.
  • communication between the EPON frame and the cable (limited TV cable) frame is required by the EPON OLT communicating with the CMC.
  • the method of the embodiment of the present invention can reduce the complexity of the system and improve the transmission efficiency.
  • each CMC communicates with the OLT through light waves of different working wavelengths, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares the system bandwidth and improves the user bandwidth under the HFC network architecture.
  • the technical solution can be implemented without modifying the terminal in the traditional HFC network architecture. Therefore, the HFC adopts the EPON mechanism in the prior art.
  • the network architecture when the traditional HFC network architecture is modified by using the technical solution of the embodiment of the present invention, the original equipment can be reused better, and the transformation cost is reduced.
  • the process flow of the communication method of the HFC network provided in the embodiment of the present invention is in a specific application scenario, and the process is a process in which the OLT sends information to the CNU.
  • the network architecture can be as shown in Figure 6.
  • the OLT is connected to multiple CMCs, and the CMC is connected to multiple CNUs.
  • Each CMC is set with a corresponding working wavelength, and the working wavelengths corresponding to the CMCs are different.
  • the OLT is provided with a CMTS, a parallel serial data conversion device, and an optical module corresponding to each CMC.
  • the processing flow of the embodiment of the present invention may include the following steps:
  • Step 1001 The CMTS in the OLT sends a parallel data signal carried by the electrical signal to the parallel serial data conversion device.
  • Step 1002 The parallel serial data conversion device in the OLT converts the parallel data signal carried by the electrical signal into a serial data signal carried by the electrical signal, and sends the data to the optical module.
  • the parallel serial data conversion device in the OLT converts the parallel data signal carried by the electrical signal into a serial data signal carried by the electrical signal, and sends the data to the optical module.
  • Step 1003 The optical module in the OLT converts the electrical signal into a light wave corresponding to the working wavelength, and sends the optical wave to the wavelength division multiplexing demultiplexer.
  • Step 1004 The wavelength division multiplexing demultiplexer in the OLT aggregates the optical waves of different working wavelengths sent by the optical modules onto the backbone optical fiber, and sends the optical fibers to the CMC.
  • Step 1005 the wavelength division multiplexing demultiplexer on the CMC side sends the OLT through the trunk optical fiber.
  • the light wave is decomposed into multiple light waves of different working wavelengths and sent to the corresponding CMC optical modules.
  • the optical module in the CMC converts the received optical wave into an electrical signal (the electrical signal carries a serial data signal) and transmits it to the parallel serial data conversion device.
  • Step 1007 The parallel serial data conversion device in the CMC converts the serial data signal carried by the received electrical signal into a parallel data signal carried by the electrical signal, and sends the data to the coaxial transceiver.
  • Step 1008 The coaxial transceiver modulates the received parallel data signal and sends it to each CNU connected to the CMC through a coaxial cable.
  • the OLT communicates with different CMCs through optical waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares the system bandwidth and improves the user bandwidth under the HFC network architecture.
  • the technical solution can be implemented without modifying the terminal in the traditional HFC network architecture. Therefore, the HFC adopts the EPON mechanism in the prior art.
  • the network architecture when the traditional HFC network architecture is modified by using the technical solution of the embodiment of the present invention, the original equipment can be reused better, and the transformation cost is reduced.
  • the process flow of the communication method of the HFC network provided in the embodiment of the present invention is in a specific application scenario, and the process is a process in which the CNU sends information to the OLT.
  • the network architecture can be as shown in Figure 6.
  • the OLT is connected to multiple CMCs, and the CMC is connected to multiple CNUs.
  • Each CMC is set with a corresponding working wavelength, and the working wavelengths corresponding to the CMCs are different.
  • the OLT is provided with a CMTS, a parallel serial data conversion device, and an optical module corresponding to each CMC.
  • the processing flow of the embodiment of the present invention may include the following steps:
  • Step 1101 The CNU sends the modulated multi-carrier parallel data signal to its connected CMC through a coaxial cable.
  • Step 1102 The coaxial transceiver in the CMC receives and demodulates the parallel data signal sent by the CNU, and sends the data to the parallel serial data conversion device.
  • Step 1103 The parallel serial data conversion device in the CMC converts the parallel data signal carried by the electrical signal sent by the coaxial transceiver into a serial data signal carried by the electrical signal, and sends the data to the optical module.
  • Step 1104 The optical module in the CMC converts the electrical signal into a light wave of its working wavelength, and sends it to the wavelength division multiplexing demultiplexer.
  • Step 1105 The wavelength division multiplexing demultiplexer on the CMC side converges the optical waves of different working wavelengths sent by each CMC on the trunk optical fiber, and sends the optical wave to the OLT.
  • Step 1106 The wavelength division multiplexing demultiplexer in the OLT decomposes the optical wave sent by the CMC side through the trunk optical fiber into multiple optical waves of different working wavelengths, and respectively sends the optical waves to the corresponding optical modules.
  • the optical module in the OLT converts the received optical wave into an electrical signal (the electrical signal carries a serial data signal) and transmits it to the parallel serial data conversion device.
  • Step 1108 The parallel serial data conversion device in the OLT converts the serial data signal carried by the received electrical signal into a parallel data signal carried by the electrical signal, and sends the data to the corresponding CMTS for subsequent processing.
  • each CMC communicates with the OLT through light waves of different working wavelengths, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares the system bandwidth and improves the user bandwidth under the HFC network architecture.
  • the technical solution can be implemented without modifying the terminal in the traditional HFC network architecture. Therefore, the HFC adopts the EPON mechanism in the prior art.
  • the network architecture when the traditional HFC network architecture is modified by using the technical solution of the embodiment of the present invention, the original equipment can be reused better, and the transformation cost is reduced.
  • the embodiment of the present invention further provides an OLT, which is applied to an HFC network including an OLT and multiple CMCs, where the OLT is respectively connected to multiple CMCs, and the CMC is connected to the terminal, such as As shown in FIG. 12, the OLT includes:
  • the setting module 1210 is configured to respectively set an operating wavelength corresponding to each CMC, and the working wavelengths corresponding to the CMCs are different;
  • the communication module 1220 is configured to: when transmitting information to the CMC, convert an electrical signal sent to each CMC into a light wave corresponding to the working wavelength, and send each optical wave to a corresponding CMC; when receiving the information sent by the CMC Receiving light waves of corresponding working wavelengths transmitted by the respective CMCs, and converting the received light waves into electrical signals for processing.
  • the OLT is respectively provided with a CMTS corresponding to each CMC;
  • the communication module 1220 is specifically configured to: when transmitting information to the CMC, transmit an electrical signal through each CMTS, and respectively convert an electrical signal transmitted by each CMTS into a light wave corresponding to the working wavelength; when receiving the CMC transmission Information, convert each received light wave into an electrical signal, and pass through The corresponding CMTS processes each electrical signal.
  • the communication module 1220 is specifically configured to:
  • each received optical wave into a serial data signal carried by the electrical signal; respectively converting each serial data signal into a parallel data signal; respectively, respectively, through the corresponding CMTS to each parallel data signal Process it.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • the OLT communicates with different CMCs through optical waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • the embodiment of the present invention further provides an OLT, which is applied to an HFC network including an OLT and multiple CMCs, where the OLT is respectively connected to multiple CMCs, and the CMC is connected to the terminal,
  • the OLT includes a first processor and a first memory, a first processor and a first memory
  • the memory is used to perform the communication method of the following HFC network:
  • the working wavelengths corresponding to the CMCs are respectively set, and the working wavelengths corresponding to the CMCs are different;
  • the optical waves corresponding to the working wavelengths transmitted by the CMCs are received, and the received optical waves are converted into electrical signals for processing.
  • the OLT is respectively provided with a CMTS corresponding to each CMC;
  • Converting the electrical signal sent to each CMC into a light wave corresponding to the working wavelength specifically: transmitting an electrical signal through each CMTS, and respectively converting the electrical signals emitted by each CMTS into light waves corresponding to the working wavelength;
  • Each received optical wave is converted into an electrical signal for processing, specifically: converting each received optical wave into an electrical signal, and processing each electrical signal through a corresponding CMTS.
  • the electrical signals transmitted by the CMTS are respectively converted into optical waves corresponding to the working wavelengths by the respective CMTSs, specifically: transmitting parallel data signals carried by the electrical signals by the CMTSs; respectively converting the parallel data signals transmitted by the CMTS into Serial data signal; respectively converting each serial data signal into a light wave corresponding to a working wavelength;
  • Each received optical wave is converted into an electrical signal, and each electrical signal is processed by a corresponding CMTS, specifically: converting each received optical wave into a serial data signal carried by the electrical signal; respectively, each serial data
  • the signals are converted into parallel data signals; each parallel data signal is processed by a corresponding CMTS.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • each serial data frame in the serial data signal Determining, according to the carrier identifier in the frame header of each serial data frame, a carrier corresponding to each data block in the serial data frame;
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • the OLT communicates with different CMCs through optical waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • the embodiment of the present invention further provides a CMC, which is applied to an HFC network including an OLT and multiple CMCs, where the OLT is respectively connected to multiple CMCs, and the CMC is connected to the terminal, such as As shown in Figure 13, the CMC includes:
  • the setting module 1310 is configured to set an operating wavelength corresponding to the CMC, and the working wavelengths corresponding to the CMCs are different;
  • the communication module 1320 is configured to: when transmitting information to the OLT, convert an electrical signal sent to the OLT into a light wave corresponding to the working wavelength, and send the optical wave to the OLT; when receiving the OLT sending In the case of information, the light wave transmitted by the OLT is received at a corresponding working wavelength, and the received light wave is converted into an electrical signal and transmitted to the terminal.
  • the communication module 1320 is specifically configured to:
  • the received optical wave When receiving the information sent by the OLT, the received optical wave is converted into a serial data signal carried by the electrical signal; and the serial data signal is converted into a parallel data signal and transmitted to the terminal.
  • the method further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • each CMC communicates with the OLT through light waves of different working wavelengths, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • the embodiment of the present invention further provides a CMC, which is applied to an HFC network including an OLT and multiple CMCs, where the OLT is respectively connected to multiple CMCs, and each CMC is respectively set with a corresponding working wavelength. And the working wavelengths of the CMCs are different, the CMC is connected to the terminal, the CMC includes a second processor and a second memory, and the second processor and the second memory are used to perform the following communication methods of the HFC network:
  • the optical wave transmitted by the OLT is received at a corresponding working wavelength, and the received optical wave is converted into an electrical signal and sent to the terminal.
  • Converting the electrical signal sent to the OLT into a light wave corresponding to the working wavelength specifically: converting the parallel data signal carried by the electrical signal sent to the OLT into a serial data signal; converting the converted serial data signal a light wave corresponding to a working wavelength;
  • the received optical wave is converted into an electrical signal and sent to the terminal, specifically: converting the received optical wave into a serial data signal carried by the electrical signal; converting the serial data signal into a parallel data signal and transmitting the signal to the terminal.
  • converting the received optical wave into a serial data signal carried by the electrical signal
  • converting the serial data signal into a parallel data signal and transmitting the signal to the terminal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • each CMC communicates with the OLT through light waves of different working wavelengths, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • the embodiment of the present invention further provides a communication system of an HFC network.
  • the OLT 1410 and the plurality of CMCs 1420 are respectively connected to multiple CMCs 1420, and the CMC 1420 and the terminal are respectively connected.
  • the OLT 1410 is configured to respectively set an operating wavelength corresponding to each CMC 1420, and the working wavelengths corresponding to the CMCs 1420 are different.
  • the electrical signals sent to the CMC 1420 are converted into corresponding operating wavelengths.
  • the light wave is sent to the corresponding CMC 1420; when receiving the information sent by the CMC 1420, the light wave corresponding to the working wavelength transmitted by each CMC 1420 is received, and the received light waves are converted into electrical signals for processing.
  • the CMC 1420 is configured to set an operating wavelength corresponding to the CMC 1420; when transmitting information to the OLT 1410, converting an electrical signal sent to the OLT 1410 into a light wave corresponding to the working wavelength, and transmitting the optical wave to the OLT1410; receiving information sent by the OLT 1410 At the corresponding working wavelength, the light wave transmitted by the OLT 1410 is received, and the received light wave is converted into an electrical signal and transmitted to the terminal.
  • the OLT 1410 is respectively provided with a CMTS corresponding to each CMC 1420;
  • the OLT 1410 is specifically configured to: when transmitting information to the CMC 1420, transmit an electrical signal through each CMTS, and respectively convert an electrical signal transmitted by each CMTS into a light wave corresponding to the working wavelength; when receiving the information sent by the CMC 1420 , each received light wave is converted into an electrical signal, and each electrical signal is processed by a corresponding CMTS.
  • the OLT 1410 is specifically configured to: when transmitting information to the CMC 1420, transmit parallel data signals carried by the electrical signals through the CMTSs; respectively convert the parallel data signals transmitted by the CMTS into serial data signals; respectively Converting the data signal into a light wave corresponding to the working wavelength; when receiving the information sent by the CMC 1420, converting each received light wave into a serial data signal carried by the electrical signal; respectively converting each serial data signal into a parallel data signal; Processing each parallel data signal through a corresponding CMTS;
  • the CMC 1420 is specifically configured to: when transmitting information to the OLT 1410, convert a parallel data signal carried by an electrical signal sent to the OLT 1410 into a serial data signal; convert the converted serial data signal into a corresponding work a light wave of a wavelength; when receiving the information transmitted by the OLT 1410, converting the received light wave into a serial data signal carried by the electrical signal; converting the serial data signal into a parallel data signal and transmitting the data to the terminal.
  • the data block of the slot further includes adding predetermined padding data between the data blocks;
  • the obtained serial data frames constitute the serial data signal
  • the converting the serial data signal into a parallel data signal is specifically:
  • Each data block in the acquired serial data frame is carried on a corresponding carrier according to a respective time slot.
  • the OLT communicates with different CMCs through optical waves of different working wavelengths respectively, and uses point-to-point communication mode when the OLT communicates with multiple CMCs, so that each CMC can use the entire system bandwidth, and each CMC connection
  • the terminal shares system bandwidth and improves user bandwidth under the HFC network architecture.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

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  • Computer Networks & Wireless Communication (AREA)
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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

Des modes de réalisation de la présente invention concernent le domaine technique des communications. L'invention concerne un procédé de communication, et un système pour réseau HFC (Hybrid Fiber Coaxial, Hybride fibre-coaxial). Le procédé est appliqué au réseau HFC comprenant un OLT (Optical Line Terminal, Terminal de ligne optique) et de multiples CMC (Coaxial Media Converter, Convertisseur multimédia coaxial). L'OLT est connecté aux multiples CMC. Les CMC sont connectés à des terminaux. Le procédé consiste à faire en sorte que : l'OLT règle une longueur d'onde de fonctionnement correspondant à chaque CMC, les longueurs d'onde de fonctionnement correspondant à chaque CMC étant différentes les unes des autres; lorsque l'OLT envoie des informations aux CMC, l'OLT convertit un signal électrique envoyé par chaque CMC en une onde lumineuse à une longueur d'onde de fonctionnement correspondante, et envoie chaque onde lumineuse à un CMC correspondant; lorsque l'OLT reçoit des informations envoyées par les CMC, l'OLT reçoit une onde lumineuse à une longueur d'onde de fonctionnement correspondante envoyée par chaque CMC et convertit chaque onde lumineuse reçue en un signal électrique pour le traitement. Conformément à la présente invention, la largeur de bande de l'utilisateur d'une architecture de réseau HFC est plus élevée.
PCT/CN2012/085166 2012-11-23 2012-11-23 Procédé, appareil et système de communication pour réseau hfc WO2014079044A1 (fr)

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