WO2017197978A1 - Procédé de télémétrie, terminal de ligne optique et unité de réseau optique - Google Patents

Procédé de télémétrie, terminal de ligne optique et unité de réseau optique Download PDF

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Publication number
WO2017197978A1
WO2017197978A1 PCT/CN2017/077913 CN2017077913W WO2017197978A1 WO 2017197978 A1 WO2017197978 A1 WO 2017197978A1 CN 2017077913 W CN2017077913 W CN 2017077913W WO 2017197978 A1 WO2017197978 A1 WO 2017197978A1
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WIPO (PCT)
Prior art keywords
onu
olt
ranging
wavelength
channel
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Ceased
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PCT/CN2017/077913
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English (en)
Chinese (zh)
Inventor
耿丹
张伟良
袁立权
马壮
黄新刚
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ZTE Corp
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ZTE Corp
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    • 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
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

Definitions

  • This document relates to, but is not limited to, the field of communications, and in particular, to a ranging method, an optical line terminal, and an optical network unit in a Passive Optical Network (PON).
  • PON Passive Optical Network
  • the topology of the PON system is shown in Figure 1.
  • the PON system usually consists of the Optical Line Terminal (OLT) on the central office, the Optical Network Unit (ONU) on the user side, and the Optical Distribution Network (ODN). It is usually a point-to-multipoint network. structure.
  • ODN consists of passive optical components such as single-mode fiber and optical splitter, optical connector, etc., providing optical transmission medium for the physical connection between OLT and ONU.
  • the related art proposes to simultaneously transmit data on multiple wavelengths in one fiber; wherein, the data of different ONUs on the same wavelength adopts time division multiplexing mode, and the uplink adopts time division multiplexing.
  • Each OLT manages multiple groups of ONUs.
  • the upstream wavelengths of the uplink data sent by a group of ONUs on the same upstream wavelength and downstream wavelength are the same.
  • the downlink wavelengths for receiving downlink data are also the same.
  • the uplink wavelengths of the uplink data transmitted by the ONU group are different on different uplink wavelengths and downlink wavelengths, and the downlink wavelengths for receiving downlink data are also different.
  • the related art In order to support the ONU to transmit data exceeding the single channel rate, the related art also proposes that the ONU can support data transmission on multiple sets of wavelength channels. Under this architecture, how can the ONU register and activate on multiple channels, that is, how the OLT obtains The wavelength channel information supported by the ONU, on which wavelength channel the ONU is registered, how the OLT completes the ranging of the ONU on multiple channels, and the related art does not propose a solution.
  • Embodiments of the present invention provide a ranging method, an optical line terminal, and an optical network unit to implement activation registration of an ONU on multiple wavelength channels.
  • An embodiment of the present invention provides a ranging method, including:
  • the optical network unit ONU opens all receivers to receive downlink data, and after responding to the registration request of the optical line terminal (OLT) on a downlink wavelength channel, responds to the registration request of the OLT; wherein the registration request carries the registered uplink bandwidth information;
  • OLT optical line terminal
  • the ONU reports the media access control address or the sequence number information to the OLT for ranging in the registered uplink bandwidth.
  • the request for registration of the response OLT includes:
  • the ONU responds to the registration request of the OLT on the downlink channel;
  • the ONU selects a channel of a minimum wavelength or a channel of a maximum wavelength among the supported wavelength channels in response to a registration request of the OLT.
  • the ranging method further includes: reporting, by the ONU, the medium access control address or the serial number information to the OLT, and reporting all wavelength channel information supported by the ONU; or
  • the ONU After receiving the message that the OLT queries the wavelength channel capability, the ONU reports all the wavelength channel information supported by the ONU.
  • the ranging method further includes: the ONU receiving a logical link identifier or the ONU identifier information that is allocated by the OLT to the ONU.
  • the ranging method further includes:
  • the ONU receives a ranging result on each wavelength channel sent by the OLT;
  • the uplink data is sent by using a delay determined according to the ranging result corresponding to the wavelength channel.
  • the ranging method further includes:
  • the uplink data transmission time information transmits uplink data.
  • An embodiment of the present invention provides an optical network unit, including:
  • the listening module is configured to enable all receivers to receive downlink data, and after receiving the registration request of the optical line terminal OLT on the downlink channel, respond to the registration request; wherein the registration request carries the information of the registered uplink bandwidth;
  • the reporting module is configured to report the media access control address or the serial number information to the OLT for ranging in the registered uplink bandwidth.
  • the requesting module is configured to respond to the registration request of the OLT, including:
  • the channel of the smallest wavelength or the channel of the largest wavelength is selected among the wavelength channels supported by the optical network unit in response to the registration request of the OLT.
  • the reporting module is configured to:
  • the optical network unit further includes:
  • the first receiving module is configured to receive a logical link identifier or the ONU identifier information that is allocated by the OLT to the ONU.
  • the optical network unit further includes:
  • a second receiving module configured to receive a ranging result on each wavelength channel sent by the OLT
  • the second sending module is configured to send the uplink data by using the delay determined by the ranging result corresponding to the wavelength channel when the uplink data is sent on the wavelength channel.
  • the optical network unit further includes:
  • the third receiving module is configured to receive uplink data sending time information corresponding to each wavelength channel sent by the OLT;
  • the third sending module uses the corresponding wavelength channel when transmitting the uplink data on the wavelength channel.
  • the uplink data transmission time information transmits uplink data.
  • An embodiment of the present invention provides a ranging method, including:
  • the optical line terminal OLT After receiving the medium access control address or sequence number information reported by the optical network unit ONU, the optical line terminal OLT allocates a logical link identifier or the ONU identifier information to the ONU;
  • the OLT After receiving, by the OLT, all the wavelength channel information supported by the ONU, the OLT performs ranging on the wavelength channel supported by the ONU.
  • the measuring, by the OLT, the ONU on the wavelength channel supported by the ONU includes:
  • the OLT simultaneously performs ranging on the ONUs on all wavelength channels supported by the ONU;
  • the OLT performs a first ranging result on the first ONU supporting all the wavelength channels in the passive optical network system to obtain a first ranging result, and obtains the optical fibers of all the wavelength channels by using the first ranging result. a length difference; the OLT performs ranging on a wavelength channel of the second ONU in the passive optical network system, and obtains a second ranging result of the second ONU on the wavelength channel, according to the The fiber length difference of the all wavelength channels, the second ranging result, and the wavelength value of the wavelength channel to be measured calculate the ranging result of the ONU in the wavelength channel to be measured.
  • the ranging method further includes:
  • the ranging result of the ONU on each wavelength channel is respectively sent to the ONU on each wavelength channel;
  • each wavelength channel and its corresponding ranging result are sent to the ONU on one of the wavelength channels;
  • the ranging result of the ONU on each wavelength channel is stored.
  • the measuring, by the OLT, the ONU on the wavelength channel supported by the ONU includes:
  • the OLT simultaneously measures the ONU on all wavelength channels supported by the ONU;
  • the OLT tests the ONUs successively on all wavelength channels supported by the ONU. distance.
  • the ranging method further includes:
  • the uplink data transmission time of the ONU is determined according to the ranging result corresponding to the ONU on each wavelength channel, and each determined wavelength channel is corresponding.
  • the uplink data transmission time information is sent to the ONU.
  • An embodiment of the present invention provides an optical line terminal, including:
  • the distribution module is configured to: after receiving the medium access control address or the serial number information reported by the ONU of the optical network unit, assign the logical link identifier or the ONU identification information to the ONU;
  • the ranging module is configured to: after receiving all the wavelength channel information supported by the ONU reported by the ONU, perform ranging on the ONU supported wavelength channel.
  • the ranging module is configured to: perform simultaneous ranging on the ONUs on all wavelength channels supported by the ONU; or
  • the second ONU in the passive optical network system performs ranging on one wavelength channel, and obtains a second ranging result of the second ONU on the wavelength channel, according to the length of the optical fiber of all the wavelength channels.
  • the difference value, the second ranging result, and the wavelength value of the wavelength channel to be measured calculate the ranging result of the ONU in the wavelength channel to be measured.
  • the optical line terminal further includes:
  • the optical line terminal further includes:
  • a fourth sending module configured to send a ranging result of the ONU on each wavelength channel to the ONU on each wavelength channel after the ranging module completes ranging; or Sending each wavelength channel and its corresponding ranging result to the ONU on a wavelength channel;
  • a storage module configured to store a ranging result for the ONU on each wavelength channel.
  • the ranging module is configured to: simultaneously measure the ONUs on all the wavelength channels supported by the ONU; or, the OLTs are aligned on all the wavelength channels supported by the ONUs.
  • the ONU performs ranging.
  • the optical line terminal further includes:
  • a determining module configured to: when the ONU sends a bandwidth allocation message on the multi-wavelength channel, determine, according to the ranging result corresponding to the ONU on each wavelength channel, an uplink data sending time of the ONU, and each wavelength to be determined The uplink data transmission time information corresponding to the channel is sent to the ONU.
  • the technical solution provided by the embodiment of the present invention includes: an optical network unit (ONU) turns on all receivers to receive downlink data, and after detecting a registration request of an optical line terminal (OLT) on a downlink wavelength channel, And responding to the registration request of the OLT; wherein the registration request carries the information of the registered uplink bandwidth; the ONU reports the media access control address or the serial number information to the OLT for ranging in the registered uplink bandwidth.
  • OLT optical line terminal
  • FIG. 1 is a structural diagram of a related art passive optical network
  • FIG. 3 is a flowchart of a method for ranging on an ONU side according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for ranging on an OLT side according to an embodiment of the present invention
  • FIG. 5 is a topological diagram of a time division wavelength division PON according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of an optical network unit according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an optical line terminal according to an embodiment of the present invention.
  • the OLT includes multiple wavelength channels, each of which uses one downlink wavelength and one uplink wavelength, and each wavelength channel manages a group of ONUs, and the group of ONUs adopts time division and complex
  • the uplink data is sent by the access mode, and different groups of ONUs on different wavelength channels use WDM to transmit data.
  • An ONU can support multiple wavelength channels. This hair
  • the embodiment of the present invention solves the problem of how the ONU registers and activates on multiple wavelength channels in the case where the ONU supports multiple wavelength channels, that is, how the OLT obtains the wavelength channel information supported by the ONU, and on which wavelength channel the ONU is registered. How the OLT completes the problem of ranging of ONUs on multiple wavelength channels.
  • FIG. 3 is a flowchart of a method for ranging on an ONU side according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • Step (S) 11 The optical network unit (ONU) turns on all receivers to receive downlink data, and after detecting the registration request of the optical line terminal (OLT) on the downlink channel, responds to the registration request of the OLT; wherein the registration request carries the registration Information of the upstream bandwidth;
  • detecting the registration request of the OLT on the downlink channel includes detecting the registration request of the OLT on a downlink channel.
  • the ONU reports the media access control address or the serial number information to the OLT for ranging in the registered uplink bandwidth.
  • the request for registration in response to the OLT in the embodiment of the present invention includes:
  • the ONU responds to the registration request of the OLT on the downlink channel; or,
  • the ONU selects the channel of the smallest wavelength or the channel of the largest wavelength in the supported wavelength channel in response to the registration request of the OLT.
  • the ranging method of the embodiment of the present invention further includes:
  • the ONU When the ONU reports the media access control address or the serial number information to the OLT, it reports all the wavelength channel information supported by the ONU; or
  • the ONU After receiving the message that the OLT queries the wavelength channel capability, the ONU reports all the wavelength channel information supported by the ONU.
  • the ranging method of the embodiment of the present invention further includes:
  • the ONU receives the logical link identifier or ONU identification information that the OLT assigns to the ONU.
  • the ranging method of the embodiment of the present invention further includes:
  • the ONU receives the ranging result on each wavelength channel sent by the OLT;
  • the ranging corresponding to the wavelength channel is used.
  • the resulting delay sends the upstream data.
  • the ranging method of the embodiment of the present invention further includes:
  • the ONU receives uplink data transmission time information corresponding to each wavelength channel sent by the OLT;
  • the uplink data is transmitted using the uplink data transmission time information corresponding to the wavelength channel.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the ranging method.
  • the embodiment of the invention further provides a distance measuring device, comprising: a memory and a processor; wherein
  • the processor is configured to execute program instructions in the memory
  • the media access control address or the serial number information is reported to the OLT for ranging in the registered upstream bandwidth.
  • FIG. 4 is a flowchart of a method for ranging on the OLT side according to an embodiment of the present invention. As shown in FIG. 4, the method includes:
  • the OLT After receiving the media access control address or sequence number information reported by the ONU, the OLT allocates a logical link identifier or ONU identifier information to the ONU.
  • the OLT After the OLT receives all the wavelength channel information supported by the ONU reported by the ONU, the OLT performs ranging on the wavelength channel supported by the ONU.
  • the OLT measures the ONU on the wavelength channel supported by the ONU, including:
  • the OLT simultaneously measures the ONU on all wavelength channels supported by the ONU;
  • the OLT performs a first ranging result on all wavelength channels of a first ONU supporting all wavelength channels in the passive optical network system, and obtains a fiber length difference of all wavelength channels by using the first ranging result;
  • the second ONU performs ranging on one wavelength channel, and obtains a second ranging result of the second ONU on the wavelength channel, according to the first ranging result, the fiber length difference of all wavelength channels and the waiting
  • the wavelength value of the ranging wavelength channel calculates the ranging result of the ONU in the wavelength channel to be measured.
  • the ONU turns on all receivers to receive downlink data, and listens for a registration request on a downlink wavelength channel, where the registration request carries the information of the registered uplink bandwidth, and responds to the registration request of the OLT on the wavelength channel; or
  • the ONU selects the minimum or maximum wavelength channel in its own supported wavelength channel to respond to the OLT's registration request.
  • the ONU reports its own media access control address or serial number information to the OLT in the registered upstream bandwidth.
  • the ONU can report the media access control address or the serial number information, and simultaneously report all the wavelength channel information supported by the ONU.
  • the wavelength channel information may include the wavelength corresponding to the channel or the code information corresponding to the wavelength channel; or the ONU queries at the OLT. After supporting the wavelength channel capability, it reports all wavelength channel information supported by itself.
  • the OLT After receiving the media access control address or the serial number information sent by the ONU, the OLT sends the logical link identifier or the ONU identifier information of the ONU to the ONU.
  • the ranging result of the ONUs on each wavelength channel is respectively sent to the ONUs in each wavelength channel; or, in one of the wavelength channels, each wavelength channel and its corresponding measurement are respectively performed.
  • the result information is sent to the ONU.
  • the OLT stores the ranging result of the ONU on each wavelength channel.
  • the uplink data transmission time of the ONU is scheduled according to the ranging result corresponding to the ONU on each wavelength channel, and the determined uplink data sending time information is sent to the ONU.
  • the delay is determined according to the ranging result corresponding to the wavelength channel, and the uplink data is sent after the delay; or the uplink data is sent according to the uplink data sending time information sent by the OLT. .
  • the OLT When the OLT performs ranging on the ONUs on all the wavelength channels supported by the ONU, the ONU turns on all the supported transmitters to respond to the OLT's ranging commands.
  • the OLT can measure the ONUs on all the channels supported by the ONUs.
  • all wavelength channels supported by the ONU can be determined by related techniques.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the ranging method.
  • the embodiment of the invention further provides a distance measuring device, comprising: a memory and a processor; wherein
  • the processor is configured to execute program instructions in the memory
  • the logical link identifier or the ONU identifier information is allocated to the ONU;
  • the ONU After receiving all the wavelength channel information supported by the ONU reported by the ONU, the ONU is measured on the wavelength channel supported by the ONU.
  • Embodiment 1 (EPON (Ethernet Passive Optical Network) - Ranging all channels of all ONUs)
  • the OLT includes multiple wavelength channels, each of which uses one downlink wavelength and one upstream wavelength. Each channel manages a group of ONUs.
  • the group of ONUs uses the time division multiplexing access mode to send uplink data, and different groups on different wavelength channels.
  • the ONU uses wavelength division multiplexing to transmit data.
  • An ONU can support multiple wavelength channels and can transmit and receive data on multiple wavelength channels.
  • the OLT and ONU use the following main steps for registration activation:
  • Step 101 The ONU turns on all the receivers to receive the downlink data, and after receiving the registration request on a downlink channel, responds to the registration request on the wavelength channel, and reports its own media access control address to the OLT in the window. Or, the ONU selects the smallest or most of the wavelength channels it supports. The large wavelength channel responds to the registration request of the OLT.
  • Step 102 When the ONU can report the media access control address information, report all wavelength channel information supported by the ONU.
  • the wavelength channel information may be the wavelength corresponding to the channel or the code information corresponding to the channel.
  • Step 103 After receiving the media access control address information sent by the ONU, the OLT sends the logical link identifier assigned to the ONU to the ONU.
  • Step 104 After obtaining all the wavelength channel information supported by the ONU, the OLT performs ranging on the ONUs in all the wavelength channels supported by the ONU, and stores the ranging result of the ONU on each channel.
  • Step 105 When the OLT sends the bandwidth allocation to the ONU on the multi-wavelength channel, the uplink data transmission time of the ONU is scheduled according to the ranging result corresponding to the ONU on each wavelength channel.
  • step 102 when the ONU can report the medium access control address information, report all the wavelength channel information supported by the ONU at the same time.
  • the wavelength channel information may be the wavelength corresponding to the channel or the code information corresponding to the channel; or the ONU asks the OLT for support. After the wavelength channel capability, report all wavelength channel information that it supports.
  • the OLT can simultaneously measure the ONU on all the channels supported by the ONU, and the ONU turns on all the supported transmitters to respond to the ranging command of the OLT; or the OLT can perform ranging on the ONUs on all channels supported by the ONU. .
  • Embodiment 2 (EPON-to-one ONU ranging)
  • the OLT includes multiple wavelength channels, each of which uses one downlink wavelength and one upstream wavelength. Each channel manages a group of ONUs.
  • the group of ONUs uses the time division multiplexing access mode to send uplink data, and different groups on different wavelength channels.
  • the ONU uses wavelength division multiplexing to transmit data.
  • An ONU can support multiple wavelength channels and can transmit and receive data on multiple wavelength channels.
  • the OLT and ONU use the following main steps for registration activation:
  • the OLT includes four ports, each port is connected to one channel, one channel uses one set of uplink wavelength and downlink wavelength, and one channel corresponds to one OLT port. And a set of ONUs on which the OLT port and the group ONU.
  • An ONU can support sending and receiving data on multiple channels, that is, one ONU can be connected to multiple channels, and multiple OLT ports can send and receive data.
  • the difference in fiber length between different channels of the PON system is measured as follows. Methods as below:
  • the loop delay of the ONU1 measured by the OLT in channel 1 is t1
  • the loop delay of the ONU1 measured by the OLT in channel 2 is t2.
  • the loop delay of the ONU1 measured by the OLT in channel 3 is t3, and the OLT is measured in channel 4.
  • the loop delay of ONU1 is t4, then the difference between the two channels of channel 1 and channel 2 is (t2-t1)*c/(2n), and the difference between the two channels of channel 1 and channel 3 is L13 ( T3-t1)*c/(2n), channel 1 and channel 4 two channel fiber difference L14 is (t4-t1)*c/(2n), then channel 2 and channel 3 two channel fiber difference L23 is (t3-t2)*c/(2n), channel 2 and channel 4 two-channel fiber difference L24 is (t4-t2)*c/(2n), channel 3 and channel 4 two channel fiber difference L34 is (t4-t3)*c/(2n), where c is the speed of light, and n is the refractive index of the light wave of the transmitted optical signal in the channel within the fiber.
  • Step 201 The ONU turns on all the receivers to receive the downlink data, and after detecting the registration window on a downlink channel, responds to the registration request on the channel, and reports its own media access control address to the OLT in the window. Or the ONU selects the minimum or maximum wavelength channel in its own supported wavelength channel to respond to the OLT registration request.
  • Step 202 When the ONU can report the media access control address information, report all the wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel.
  • Step 203 After receiving the media access control address information sent by the ONU, the OLT sends the logical link identifier assigned to the ONU to the ONU.
  • Step 204 The OLT performs ranging on the ONU registration channel to obtain the ranging result of the ONU in the registration channel.
  • the OLT determines the wavelength of the optical path of the different channels according to the ranging result and the wavelength of the other to-be-measured channel supported by the ONU.
  • the value calculates the ranging result of the ONU in other channels to be measured.
  • Step 205 When the OLT sends the bandwidth allocation to the ONU on the multi-channel, the uplink data transmission time of the ONU is scheduled according to the ranging result corresponding to the ONU on each channel.
  • step 202 when the ONU can report the medium access control address information, it simultaneously reports all the wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel; or the ONU asks the OLT for the supported wavelength. After the channel capability, report all wavelength channel information that it supports.
  • Embodiment 3 (Gigabit-Capable Passive Optical Network (GPON) - for all ONU ranging)
  • the OLT includes multiple wavelength channels, each of which uses one downlink wavelength and one upstream wavelength. Each channel manages a group of ONUs.
  • the group of ONUs uses the time division multiplexing access mode to send uplink data, and different groups on different wavelength channels.
  • the ONU uses wavelength division multiplexing to transmit data.
  • An ONU can support multiple wavelength channels and can transmit and receive data on multiple wavelength channels.
  • the OLT and ONU use the following main steps for registration activation:
  • Step 301 The ONU turns on all the receivers to receive the downlink data, and after detecting the registration window on a downlink channel, responds to the registration request on the channel, and reports its own serial number to the OLT in the window. Or the ONU selects the minimum or maximum wavelength channel in its own supported wavelength channel to respond to the OLT registration request.
  • Step 302 When the ONU can report the serial number, report all wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel.
  • Step 303 After receiving the sequence number information sent by the ONU, the OLT sends the ONU identifier assigned to the ONU to the ONU.
  • Step 304 After obtaining all the wavelength channel information supported by the ONU, the OLT performs ranging on the ONUs in all the wavelength channels supported by the ONU, and sends the ranging results of the ONUs on each channel to the ONUs in each channel, or Among them, one channel sends all channels and their corresponding ranging result information to the ONU.
  • Step 305 The OLT sends a bandwidth allocation to the ONU on multiple channels.
  • the uplink data is sent after the delay of the corresponding ranging result of the channel.
  • step 302 when the ONU can report the serial number information, it simultaneously reports all the wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel; or the ONU after the OLT queries its supported wavelength channel capability. Report all wavelength channel information that you support.
  • the OLT can simultaneously measure the ONU on all channels supported by the ONU, and the ONU turns on all the supported transmitters to respond to the ranging command of the OLT; or the OLT can perform ranging on the ONUs on all channels supported by the ONU. .
  • Embodiment 4 (GPON-to-one ONU ranging)
  • the OLT includes multiple wavelength channels, each of which uses one downlink wavelength and one upstream wavelength. Each channel manages a group of ONUs.
  • the group of ONUs uses the time division multiplexing access mode to send uplink data, and different groups on different wavelength channels.
  • the ONU uses wavelength division multiplexing to transmit data.
  • An ONU can support multiple wavelength channels and can transmit and receive data on multiple wavelength channels.
  • the OLT and ONU use the following main steps for registration activation:
  • the OLT consists of four ports. Each port is connected to one channel.
  • One channel uses one upstream wavelength and one downstream wavelength, and one channel corresponds to one OLT port.
  • An ONU can support sending and receiving data on multiple channels, that is, one ONU can be connected to multiple channels, and multiple OLT ports can send and receive data.
  • the difference in fiber length between different channels of the PON system is measured as follows. Methods as below:
  • the OLT measures the loop delay of ONU1 to be t1 on channel 1, and the OLT measures ONU1 on channel 2.
  • the loop delay is t2
  • the loop delay of the ONU1 measured by the OLT in channel 3 is t3
  • the loop delay of the ONU1 measured by the OLT in channel 4 is t4
  • the difference between the two channels of channel 1 and channel 2 is L12 is (t2-t1)*c/(2n)
  • the difference between the two channels of channel 1 and channel 3 is L13 (t3-t1)*c/(2n)
  • the difference between two channels of channel 1 and channel 4 L14 is (t4-t1)*c/(2n)
  • the difference between the two channels of channel 2 and channel 3 is L23 (t3-t2)*c/(2n)
  • the channel 2 and channel 4 are poor.
  • the value L24 is (t4-t2)*c/(2n), and the channel L3 of channel 3 and channel 4 is (t4-t3)*c/(2n), c is the speed of light, and n is the transmission in the channel.
  • Step 401 The ONU turns on all the receivers to receive the downlink data, and after detecting the registration window on a downlink channel, responds to the registration request on the channel, and reports its own serial number to the OLT in the window. Or the ONU selects the minimum or maximum wavelength channel in its own supported wavelength channel to respond to the OLT registration request.
  • Step 402 When the ONU can report the serial number, report all wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel.
  • Step 403 After receiving the serial number information sent by the ONU, the OLT sends the ONU identifier assigned to the ONU to the ONU.
  • Step 404 The OLT performs ranging on the ONU to obtain the ranging result of the ONU in the registration channel.
  • the OLT obtains the difference between the optical fibers of different channels and other to-be-measured channels supported by the ONU according to the foregoing ranging result.
  • the wavelength value calculates the ranging result of the ONU in other channels to be measured.
  • Step 405 The OLT sends the bandwidth allocation to the ONU on the multi-channel.
  • the ONR sends the uplink data after using the ranging result corresponding to the channel.
  • step 402 of the embodiment when the ONU can report the serial number information, it simultaneously reports all the wavelength channel information supported by the ONU, and the information may be the wavelength corresponding to the channel or the code information corresponding to the channel; or the ONU asks the OLT for the supported wavelength at the OLT. After the channel capability, report all wavelength channel information that it supports.
  • FIG. 6 is a schematic diagram of an optical network unit according to an embodiment of the present invention. As shown in FIG. 6, the method includes:
  • the listening module is configured to enable all receivers to receive downlink data, and after receiving the registration request of the OLT on the downlink channel, respond to the registration request; wherein the registration request carries the information of the registered uplink bandwidth;
  • the reporting module is configured to report the media access control address or the serial number information to the OLT for ranging in the registered uplink bandwidth.
  • the listening module is configured to respond to the registration request of the OLT, including:
  • the channel of the smallest wavelength or the channel of the largest wavelength is selected in the wavelength channel supported by the optical network unit in response to the registration request of the OLT.
  • the reporting module is configured to: report the medium access control address or the serial number information to the OLT, and report all the wavelength channel information supported by the optical network unit; or, after receiving the message that the OLT queries the wavelength channel capability, Report all wavelength channel information supported by the optical network unit.
  • the optical network unit may further include:
  • the first receiving module is configured to receive a logical link identifier or ONU identifier information that is allocated by the OLT to the ONU.
  • the optical network unit may further include:
  • a second receiving module configured to receive a ranging result on each wavelength channel sent by the OLT
  • the second sending module is configured to send uplink data by using a delay determined by the ranging result corresponding to the wavelength channel when the uplink data is sent on different wavelength channels.
  • the optical network unit may further include:
  • the third receiving module is configured to receive uplink data sending time information corresponding to each wavelength channel sent by the OLT;
  • the third sending module is configured to send the uplink data by using the uplink data sending time information corresponding to the corresponding wavelength channel when the uplink data is sent on different wavelength channels.
  • FIG. 7 is a schematic diagram of an optical line terminal according to an embodiment of the present invention. As shown in FIG. 7, the method includes:
  • the distribution module is configured to receive the logical link identifier or the ONU identifier information to the ONU after receiving the medium access control address or the sequence number information reported by the ONU of the optical network unit;
  • the ranging module is configured to receive the ONUs on the wavelength channel supported by the ONU after receiving all the wavelength channel information supported by the ONUs reported by the ONU.
  • the ranging module is configured to perform simultaneous ranging on the ONUs on all wavelength channels supported by the ONU;
  • the first ONU supporting all wavelength channels in the passive optical network system performs ranging on all wavelength channels to obtain a first ranging result, and the first ranging result obtains the fiber length difference of all wavelength channels;
  • the second ONU in the source optical network system performs ranging on one wavelength channel, and obtains a second ranging result of the second ONU on the wavelength channel, according to the fiber length difference of all wavelength channels, the second ranging result, and the to-be-tested
  • the distance value of the wavelength channel is calculated from the distance measurement of the ONU in the wavelength channel to be measured.
  • the optical line terminal may further include:
  • the fourth sending module is configured to: after the ranging module completes the ranging, send the ranging result of the ONU on each wavelength channel to the ONU on each wavelength channel; or, on one of the wavelength channels, The wavelength channels and their corresponding ranging results are sent to the ONU;
  • a storage module configured to store a ranging result for the ONU on each wavelength channel.
  • the ranging module is configured to perform ranging on the ONUs on all the wavelength channels supported by the ONU.
  • the OLT performs ranging on the ONUs on all wavelength channels supported by the ONU.
  • the optical line terminal may further include:
  • the determining module is configured to: when the ONU sends the bandwidth allocation message on the multi-wavelength channel, determine the uplink data sending time of the ONU according to the ranging result corresponding to the ONU on each wavelength channel, and send the determined uplink data corresponding to each wavelength channel.
  • the time information is sent to the ONU.
  • each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, being executed by a processor and stored in a memory. Programs/instructions to implement their respective functions.
  • the invention is not limited to any specific form of combination of hardware and software.
  • the above technical solution implements fast registration of the OLT when the ONU supports multiple channels, and avoids uplink data conflicts with other ONUs.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé de télémétrie, un terminal de ligne optique (OLT) et une unité de réseau optique (ONU). Le procédé comprend les étapes suivantes : une unité de réseau optique (ONU) ouvre tous les récepteurs pour recevoir des données de liaison descendante et, après avoir surveillé une demande d'enregistrement d'un terminal de ligne optique (OLT) dans un canal de longueur d'onde de liaison descendante, répond à la demande d'enregistrement de l'OLT, la demande d'enregistrement contenant des informations de la largeur de bande de liaison montante enregistrée ; et l'ONU rapporte à l'OLT l'adresse de commande d'accès au support ou les informations de numéro de séquence se trouvant dans la largeur de bande de liaison montante enregistrée, pour effectuer une télémétrie. Les modes de réalisation de la présente invention réalisent un enregistrement rapide de l'OLT lorsque l'ONU supporte une pluralité de canaux, ce qui permet d'éviter des conflits de données de liaison montante avec d'autres ONU.
PCT/CN2017/077913 2016-05-16 2017-03-23 Procédé de télémétrie, terminal de ligne optique et unité de réseau optique Ceased WO2017197978A1 (fr)

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WO2025016442A1 (fr) * 2023-07-19 2025-01-23 华为技术有限公司 Procédé et appareil d'enregistrement pour réseau de communication optique, dispositif de réseau et système

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