WO2017133003A1 - 一种无源光网络调制格式切换的方法、装置和系统 - Google Patents

一种无源光网络调制格式切换的方法、装置和系统 Download PDF

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Publication number
WO2017133003A1
WO2017133003A1 PCT/CN2016/073682 CN2016073682W WO2017133003A1 WO 2017133003 A1 WO2017133003 A1 WO 2017133003A1 CN 2016073682 W CN2016073682 W CN 2016073682W WO 2017133003 A1 WO2017133003 A1 WO 2017133003A1
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WIPO (PCT)
Prior art keywords
modulation format
message
optical network
network unit
target
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Ceased
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PCT/CN2016/073682
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English (en)
French (fr)
Inventor
李胜平
叶志成
吴徐明
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP16888827.9A priority Critical patent/EP3404854B1/en
Priority to PCT/CN2016/073682 priority patent/WO2017133003A1/zh
Priority to CN201680049018.8A priority patent/CN108702213B/zh
Publication of WO2017133003A1 publication Critical patent/WO2017133003A1/zh
Priority to US16/054,388 priority patent/US10601515B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • 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
    • H04Q11/0005—Switch and router 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
    • 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
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0045—Synchronisation
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, apparatus, and system for switching a passive optical network modulation format.
  • Passive Optical Network is a point-to-multipoint optical fiber transmission and access technology.
  • the downlink uses broadcast mode and uplink uses Time Division Multiple Access (TDMA) mode. It forms a topological structure such as a tree, a star, or a bus. It does not require a node device at the optical branch point, and only needs to install a simple optical splitter.
  • TDMA Time Division Multiple Access
  • FIG. 1 is a schematic diagram of a tree topology that is commonly used in existing PONs, including: an optical line terminal (OLT) 101 on the central office, an optical network unit (ONU) on the user side, or an optical network terminal. (Optical Network Terminal, ONT) 103 and an Optical Distribution Network (ODN) 102.
  • ONT optical line terminal
  • ONT optical network terminal
  • ODN Optical Distribution Network
  • the so-called “passive” means that the ODN does not contain any active electronic devices and electronic power supplies, and all consist of passive components such as splitters.
  • the transmission from the OLT to the ONU is in the downlink direction
  • the transmission from the ONU to the OLT is in the uplink direction.
  • GPON gigabit-Capable PON
  • EPON Error Network Passive Optical Network
  • PAM Pulse Amplitude Modulation
  • 4-order modulation Duobinary modulation
  • orthogonality Orthogonality
  • Quadrature Phase Shift Keyin Phase shift keying
  • OFDM Orthogonal Frequency Division Multiplexing
  • the embodiments of the present invention provide a method, a device, and a system for switching a modulation format of a passive optical network, which are used to implement registration of an optical network unit and switching of a modulation format in a case where a passive optical network supports multiple modulation modes.
  • a method for switching a passive optical network modulation format is provided.
  • the method is performed by an optical line terminal in the central office side of the PON system, and the optical line terminal implements interaction with the optical network unit.
  • the optical line terminal sends a registration message to the optical network unit in each of the supported uplink modulation formats and/or the downlink modulation format.
  • the optical line terminal then receives the first message reported by the optical network unit, where the first message includes uplink modulation.
  • the optical line terminal determines a target uplink modulation format and/or a target downlink modulation format of the optical network unit according to the first message, and notifies the optical network unit to switch to the target uplink modulation format And/or target downstream modulation format.
  • the optical line terminal receives the second message reported by the optical network unit, where the second message includes an indication that the optical network unit completes handover to the target uplink modulation format and/or the target downlink modulation format, And the optical line terminal further switches to the target uplink modulation format and/or the target downlink modulation format, and sends an acknowledgement authorization message in the target uplink modulation format and/or the target downlink modulation format, and performs synchronization confirmation with the optical network unit.
  • the optical line terminal receives the third message reported by the optical network unit, the third message includes receiving error information, and the optical line terminal further determines, according to the third message, that the optical network unit completes the uplink. Modulation format and/or downstream modulation format switching.
  • the optical line terminal sends a fourth message to the optical network unit, informing the optical network unit to switch back to the source uplink modulation format and/or the source downlink modulation format.
  • a method of switching a passive optical network modulation format is provided. Specifically, the optical network unit reports the first message to the optical line terminal, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability. Then, the optical network unit receives the notification message sent by the optical line terminal.
  • the notification message includes a target uplink modulation format and/or a target downlink modulation format; the optical network unit then switches the uplink modulation format and/or the downlink modulation format to the target uplink modulation format and/or the target downlink modulation format.
  • the optical network unit reports a second message to the optical line terminal, where
  • the second message includes an indication message that the optical network unit completes the handover to the target uplink modulation format and/or the target downlink modulation format; the optical network unit further receives an acknowledgement authorization message sent by the optical line terminal and performs with the optical line terminal Synchronous confirmation.
  • the optical network unit reports a third message to the optical line terminal, and the third message includes receiving error information.
  • the optical network unit receives the fourth message sent by the optical line terminal, where the fourth message includes indicating that the optical network unit switches back to the source uplink modulation format and/or the source downlink modulation format; the optical network unit It also switches back to the source upstream modulation format and/or the source downstream modulation format.
  • an optical line terminal including a first sending unit, configured to separately send a registration message to an optical network unit in all supported uplink modulation formats and/or downlink modulation formats; and send a notification message to the optical network.
  • a unit the notification message is used to notify the optical network unit to switch to the target uplink modulation format and/or the target downlink modulation format
  • the first receiving unit is configured to receive the first message reported by the optical network unit, where the first message is sent
  • the uplink processing format capability and/or the downlink modulation format capability are included; the first processing unit is configured to determine, according to the first message, a target uplink modulation format and/or a target downlink modulation format of the optical network unit.
  • an optical network unit including a second sending unit, configured to report a first message to an optical line terminal, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability; and the second receiving a unit, configured to receive a notification message sent by the optical line terminal, where the notification message includes a target uplink modulation format and/or a target downlink modulation format, and a second processing unit, configured to use an uplink modulation format and/or a downlink modulation format. Switching to the target upstream modulation format and/or the target downstream modulation format.
  • a passive optical network system including the optical line termination described above and the optical network unit described above.
  • a network element comprising a memory for storing computer executable program code; a transceiver, and a processor coupled to the memory and the transceiver;
  • the program code includes instructions, when the processor executes the instructions, the instructions cause the communication device to perform the following operations: respectively issuing a registration message to all supported uplink modulation formats and/or downlink modulation formats to And an optical network unit that receives the first message reported by the optical network unit, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability; and determining, according to the first message, a target uplink modulation format of the optical network unit and/or Or the target downlink modulation format, notifying the optical network unit to switch to the target uplink modulation format and/or the target downlink modulation format.
  • a network element comprising a memory for storing computer executable program code; a transceiver, and a processor coupled to the memory and the transceiver;
  • the program code includes instructions, when the processor executes the instruction, the instruction causes the communication device to perform an operation of reporting a first message to an optical line terminal, the first message including an uplink modulation format capability And/or a downlink modulation format capability; receiving a notification message sent by the optical line terminal, where the notification message includes a target uplink modulation format and/or a target downlink modulation format; and switching the uplink modulation format and/or the downlink modulation format to the The target uplink modulation format and/or the target downlink modulation format are described.
  • the OLT of the present invention sends a registration message to the optical network unit in the supported uplink modulation format and/or the downlink modulation format, and then the OLT receives the first message reported by the optical network unit, where the first message includes Uplink modulation format capability and/or downlink modulation format capability, and finally the OLT determines a target uplink modulation format and/or a target downlink modulation format of the optical network unit according to the first message, and notifies the optical network unit to switch to the target uplink modulation format. And/or target downstream modulation format. Therefore, the PON system supporting multiple modulation formats is supported, and the modulation format reporting capability of the ONU is increased, and the switching mode of the ONU registration online and the registration after the online registration is realized.
  • 1 is a frame structure diagram of a passive optical network system
  • FIG. 2 is a diagram of a passive optical network system in which a plurality of modulation modes coexist
  • FIG. 3 is a flowchart of a method for switching a modulation format of a PON system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of ONU registration on-line in a downlink modulation mode adjustable scenario according to an embodiment of the present invention
  • FIG. 5 is a flowchart of an ONU switching modulation format in a downlink modulation format adjustable scenario according to an embodiment of the present disclosure
  • FIG. 6 is a flowchart of an ONU switching modulation format in an adjustable scene of an uplink modulation format according to an embodiment of the present disclosure
  • FIG. 7 is a block diagram of an optical line terminal according to an embodiment of the present invention.
  • FIG. 8 is a block diagram of an optical network unit according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a network element according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another network element according to an embodiment of the present invention.
  • FIG. 2 is a PON system in which multiple modulation modes coexist.
  • ONU1 a dual binary modulation mode is adopted, and the maximum transmission rate is up to 20G.
  • ONU2 the PAM 8th order modulation mode is adopted, and the maximum transmission rate can reach 30G.
  • ONU3 the PAM 4th order modulation mode is adopted, and the maximum transmission rate can reach 20G.
  • ONU4 the PAM2 order modulation mode is adopted, and the maximum transmission rate can reach 10G.
  • the above various modulation methods can coexist, for example, NRZ and PAM4 coexist, or Duo-binary and PAM4 coexist, and even two or more modulation modes coexist.
  • FIG. 3 is a flowchart of a method for switching a modulation format of a PON system according to an embodiment of the present invention, including the following steps:
  • Step 301 The OLT delivers all the modulation formats that can be supported, and notifies the ONU. It should be noted that all ONI modulation formats and/or downlink modulation format capabilities supported by the OLT are learned before the ONU registers.
  • Step 302 The OLT polls and sends the registration window to each of the supported uplink modulation formats and/or the downlink modulation format, that is, the registration message is sent to the ONU in the form of a broadcast.
  • Step 303 The ONU determines whether the registration window is satisfied with the current uplink modulation format and/or the downlink modulation format. If yes, the ONU registers the uplink in the currently supported uplink modulation format and/or the downlink modulation format, and reports the first message.
  • the first message includes an uplink modulation format capability and/or a downlink modulation format capability, and if not, the registration is suspended.
  • Step 304 The OLT receives the first message reported by the ONU.
  • Step 305 The OLT determines, according to the first message, a target uplink modulation format and/or a target downlink modulation format of the ONU, and notifies the ONU to switch to the target uplink modulation format and/or target downlink. Modulation format.
  • Step 306 The ONU receives the notification message delivered by the OLT, where the notification message includes a target uplink modulation format and/or a target downlink modulation format.
  • Step 307 The ONU switches the uplink modulation format and/or the downlink modulation format to the target uplink modulation format and/or the target downlink modulation format.
  • Step 308 The ONU reports a second message to the OLT, where the second message includes an indication message that the ONU completes handover to the target uplink modulation format and/or the target downlink modulation format.
  • the ONU reports the second message to the OLT, and determines whether the acknowledgment authorization message sent by the optical line terminal is received within the second preset time. If not, the source uplink modulation format is switched back to / or source downstream modulation format.
  • Step 309 The OLT receives the second message reported by the optical network unit, where the second message includes an indication that the ONU completes handover to the target uplink modulation format and/or the target downlink modulation format.
  • Step 310 The OLT switches to the target uplink modulation format and/or the target downlink modulation format, and sends an acknowledgement authorization message in the target uplink modulation format and/or the target downlink modulation format, and performs synchronization confirmation with the optical network unit.
  • the OLT sends an acknowledgement authorization message, and the timeout mechanism is enabled.
  • the OLT determines whether the optical network unit receives the acknowledgement authorization message within a first preset time. If not, the counter is added. One. The OLT then determines if the value of the counter is greater than a threshold, and if so, ends the switching of the upstream modulation format and/or the downstream modulation format.
  • Step 311 The ONU receives the confirmation authorization message sent by the OLT and performs synchronization confirmation with the OLT.
  • Step 312 The ONU reports a third message to the OLT, where the third message includes receiving error information.
  • Step 313 The OLT determines, according to the third message, that the ONU completes the uplink modulation format and/or the downlink modulation format switch, or proceeds to step 314.
  • Step 314 Instruct the ONU to switch back to the source uplink modulation format and/or the source downlink modulation format.
  • the embodiment of the present invention is directed to supporting a plurality of modulation format PON systems, increasing the modulation format reporting capability of the ONU, and implementing switching of the modulation mode after the ONU is registered to go online and the registration is online.
  • MPCP Multi-Point
  • Control Protocol multi-point control protocol
  • modulation format switching such as (1) extended GATE message, add the downlink and / or uplink modulation format supported by this window; (2) extend REGISTER_REQ message, add ONU downlink and / Or uplink modulation format capability information.
  • the modulation format switching is implemented by extending the MPCP message, and a message such as MODULATION_REQ, MODULATION_ACK MPCPDU is added, where: MODULAITON_REQ MPCPDU includes LLID (Logical Link Identifier), Target Downstream Modulation Information such as (target downstream modulation format).
  • the MODULATION_ACK MPCPDU includes an echo of LLID, an echo of target Downstream Modulation, an echo of Sync, and an ONU receives error information.
  • the extended MPCP message may be replaced by an OAM (Operational Administration and Maintenance) or a PLOAM (Physical Layer Operations, Administration and Maintenance) message, such as an ONU Information OAMPDU extension.
  • OAM Operaational Administration and Maintenance
  • PLOAM Physical Layer Operations, Administration and Maintenance
  • ONU Information OAMPDU extension an ONU Information OAMPDU extension.
  • modulation format switching is implemented by adding a MODULATION_REQ OAMPDU and a MODULATION_ACK OAMPDU.
  • the OAMPDU implements a modulation format switching process and an MPCP switching process.
  • the third way is to expand the Discovery Information Fields in the REGISTER_REQ MPCPDU, and expand the Bit6-15 in the Discovery Information Fields
  • the ONU upstream is PAM4 capable
  • the ONU upstream is PAM8 capable, etc. registration process.
  • expand the REGISTER_REQ MPCPDU add the Modulation Information Fields, and add the bit in the Modulation Information Fields.
  • ONU upstream is PAM4 capable (ONU upstream PAM4 is available);
  • ONU upstream is PAM8 capable (ONU upstream PAM8 is available) and many more.
  • the MODULATION_REQ MPCPDU includes information such as LLID, Target Upstream Modulation, and the like; the MODULATION MPCPDU includes information such as echo of LLID, echo of target Upstream Modulation.
  • This extended MPCP message can be replaced by an extended OAM or PLOAM message.
  • an optical line terminal OLT including:
  • the first sending unit 701 is configured to separately send a registration message to the optical network unit in all supported uplink modulation formats and/or downlink modulation formats; and send a notification message to the optical network unit to notify the consumer
  • the information is used to notify the optical network unit to switch to the target uplink modulation format and/or the target downlink modulation format.
  • the first receiving unit 702 is configured to receive the first message reported by the optical network unit, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability.
  • the first processing unit 703 is configured to determine, according to the first message, a target uplink modulation format and/or a target downlink modulation format of the optical network unit.
  • the first receiving unit 703 is further configured to receive the second message reported by the optical network unit, where the second message includes an indication that the optical network unit completes the handover to the target uplink modulation format and/or the target downlink modulation format.
  • the first processing unit 702 is further configured to switch the optical line terminal to the target uplink modulation format and/or the target downlink modulation format.
  • the first sending unit 701 is further configured to send an acknowledgement authorization message in a target uplink modulation format and/or a target downlink modulation format, and perform synchronization confirmation with the optical network unit.
  • the first receiving unit 702 is further configured to receive a third message reported by the optical network unit, where the third message includes receiving error information.
  • the first processing unit 703 is further configured to determine, according to the third message, that the optical network unit completes the uplink modulation format and/or the downlink modulation format switch.
  • the first sending unit 701 is further configured to send a fourth message to the optical network unit, where the fourth message is used to notify the optical network unit to switch back to the source uplink modulation format and/or the source downlink modulation format.
  • the first processing unit 703 is further configured to: determine whether the optical network unit receives the confirmation authorization message within the first preset time, if not, the counter is incremented by one; and is used to determine whether the value of the counter is greater than a threshold, If so, the switching of the upstream modulation format and/or the downstream modulation format is ended.
  • the present invention also discloses an optical network unit ONU, including:
  • the second sending unit 801 is configured to report the first message to the optical line terminal, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability.
  • the second receiving unit 802 is configured to receive a notification message that is sent by the optical line terminal, where the notification message includes a target uplink modulation format and/or a target downlink modulation format.
  • the second processing unit 803 is configured to switch the uplink modulation format and/or the downlink modulation format to the target uplink modulation format and/or the target downlink modulation format.
  • the second sending unit 801 is further configured to report the second message to the optical line terminal, where the second message includes the optical network unit completing the handover to the target uplink modulation format and/or the target downlink modulation format. Indicate the message.
  • the second receiving unit 802 is further configured to receive an acknowledgement authorization message sent by the optical line terminal.
  • the second processing unit 803 is further configured to perform synchronization confirmation with the optical line terminal.
  • the second sending unit 801 is further configured to report a third message to the optical line terminal, where the third message includes receiving error information.
  • the second receiving unit 802 is further configured to receive a fourth message sent by the optical line terminal, where the fourth message includes instructing the optical network unit to switch back to the source uplink modulation format and/or the source downlink modulation format.
  • the second processing unit 803 is further configured to switch the optical network unit back to the source uplink modulation format and/or the source downlink modulation format.
  • the second processing unit 803 is further configured to: determine whether the acknowledgement authorization message sent by the optical line terminal is received within the second preset time, and if not, switch the optical network unit back to the source uplink modulation format. And/or source downstream modulation format.
  • the embodiment of the present invention further discloses a passive optical network, as shown in FIG. 1, including the above-mentioned embodiment and the optical line terminal shown in FIG. 7 and the above embodiment and the optical network unit shown in FIG.
  • FIG. 9 is a schematic structural diagram of an optical line terminal according to an embodiment of the present invention.
  • the network element is used to transmit or process data in the PON system shown in FIG. 2.
  • Network element 900 can include one or more ports 908 coupled to a transceiver 906.
  • Transceiver 906 can be a transmitter, a receiver, or a combination thereof that transmits or receives data packets from other network nodes through port 912.
  • Processor 902 is coupled to transceiver 906 for processing data packets.
  • Processor 902 can include one or more multi-core processors and/or memory 904.
  • the processor 902 can be a general purpose processor, an application specific integrated circuit (ASIC), or a digital signal processor (DSP).
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • Memory 904 can be a non-transitory storage medium coupled to processor 902 for storing different types of data.
  • the memory 904 may include a read only memory (ROM), a random access memory (RAM), or other types of dynamic storage devices that can store information and instructions, and may also be a disk storage.
  • Memory 904 can be used to hold instructions that implement a PON system or related methods. It will be appreciated that at least one of the cache and long term storage is programmed or loaded by the processor 902 of the network element 900 by programming or loading executable instructions.
  • Network element 900 can implement one or more instructions to obtain service chain information in accordance with an embodiment of the present invention. These instructions may be stored in the memory 904 or integrated into the kernel of the operating system of the network element or a plug-in of the kernel.
  • network element 900 acts as an optical line termination and includes a memory 904, a processor 902 and a transceiver 906, and one or more ports 908 coupled to the transceiver.
  • the program code includes instructions, when the processor executes the instruction, the instruction causes the network element to perform the following operations: respectively sending a registration message to all supported uplink modulation formats and/or downlink modulation formats to And an optical network unit that receives the first message reported by the optical network unit, where the first message includes an uplink modulation format capability and/or a downlink modulation format capability; and determining, according to the first message, a target uplink modulation format of the optical network unit and/or Or the target downlink modulation format, notifying the optical network unit to switch to the target uplink modulation format and/or the target downlink modulation format.
  • FIG. 10 is a schematic structural diagram of a network element as an optical network unit according to an embodiment of the present invention.
  • Network element 1000 can include one or more ports 1008 coupled to a transceiver 1006.
  • the transceiver 1006 can be a transmitter, a receiver, or a combination thereof that transmits or receives data packets from other network nodes through port 1008.
  • Processor 1002 is coupled to transceiver 1006 for processing data packets.
  • Processor 1002 can include one or more multi-core processors and/or memory 1004.
  • the processor 1002 can be a general purpose processor, an application specific integrated circuit (ASIC), or a digital signal processor (DSP).
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • the memory 1004 can be a non-transitory storage medium coupled to the processor 1002 for storing different types of data.
  • the memory 1004 may include a read only memory (ROM), a random access memory (RAM), or other types of dynamic storage devices that can store information and instructions, and may also be a disk storage.
  • Memory 1004 can be used to store instructions that implement an NFV system or related methods. It will be appreciated that at least one of the cache and long term storage is programmed or loaded into the processor 1002 of the network element 1000 by programming or loading.
  • network element 1000 as an optical network unit, includes a memory 1004, a processor 1002 and a transceiver 1006, and one or more ports 1008 coupled to the transceiver.
  • a memory 1004 for storing computer executable program code;
  • a processor 1002 coupled to the memory 1004 and the transceiver 1006;
  • the program code includes instructions, when the processor executes the instruction, the instruction causes the network element to perform the following operations: reporting a first message to an optical line terminal, where the first message includes an uplink modulation format capability And/or downlink modulation format capability; receiving the notification sent by the optical line terminal And the message includes a target uplink modulation format and/or a target downlink modulation format; and switches the uplink modulation format and/or the downlink modulation format to the target uplink modulation format and/or the target downlink modulation format.
  • the subject matter described herein can be implemented in software incorporating hardware and/or firmware.
  • the subject matter described herein can be implemented in software executed by one or more processors.
  • the subject matter described herein can be implemented using a non-transitory computer readable medium storing computer executable instructions that, when executed by a computer processor, control the computer to perform the steps.
  • Example computer readable media suitable for implementing the subject matter described herein include non-transitory computer readable media, such as disk storage devices, chip memory devices, programmable logic devices, and application specific integrated circuits.
  • a computer readable medium embodying the subject matter described herein can be located on a single device or computing platform or can be distributed across multiple devices or computing platforms.

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Abstract

本发明实施例公开了一种无源光网络调制格式切换的方法、装置和系统，其中方法包括：OLT以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；OLT接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；OLT根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。从而使得支持多种调制格式PON系统，增加ONU的调制格式上报能力，实现ONU注册上线以及注册上线之后的调制方式的切换。

Description

一种无源光网络调制格式切换的方法、装置和系统 技术领域
本发明涉及通信领域，尤其涉及一种无源光网络调制格式切换的方法、装置和系统。
背景技术
随着光纤到户(Fiber To The Home，FTTH)的大规模部署，光接入的带宽需求越来越大。目前光接入主流采用PON(Passive Optical Network，无源光纤网络)技术。无源光网络(Passive Optical Network，PON)技术是一种点对多点的光纤传输和接入技术，下行采用广播方式、上行采用时分多址(Time Division Multiple Access，TDMA)方式，可以灵活地组成树型、星型、总线型等拓朴结构，在光分支点不需要节点设备，只需要安装一个简单的光分支器即可。图1是现有PON常用的一种树形拓扑结构示意图，包括：局侧的光线路终端(Optical Line Terminal，OLT)101、用户侧的光网络单元(Optical Network Unit，ONU)或者光网络终端(Optical Network Terminal，ONT)103以及光分配网络(Optical Distribution Network，ODN)102。所谓“无源”，是指ODN中不含有任何有源电子器件及电子电源，全部由光分路器(Splitter)等无源器件组成。在PON系统中，OLT到ONU的传输为下行方向，ONU到OLT的传输为上行方向。
现阶段各种PON技术共存，比如GPON(Gigabit-Capable PON，吉比特无源光网络)，EPON(Ethernet Passive Optical Network，以太网无源光网络)。而对于当前GPON或EPON网络来说，当单通道传输超过10Gb/s的时候，如果再采用不归零(NRZ，Non Return Zero)码形，其带宽效率会较低。另一方面，在光通信中，NRZ编码在超过10Gb/s速率的时候，其色散会变得很严重。所以在单通道传输高于10Gb/s以后，较多采用多阶或高阶调制方式，最常见调制方式有PAM(Pulse Amplitude Modulation，脉冲振幅)4阶调制，双二进制(Duobinary)调制，正交相移键控(QPSK，Quadrature Phase Shift Keyin)调制，正交频分复用(OFDM，Orthogonal Frequency Division Multiplexing)调制等等。当一个系统支持多种调制方式情况下，如何进行ONU/ONT(Optical Network Terminal，光网络终端)注册上线以及注册上线 之后的调制方式的切换，至今仍没有有效的解决方案。
发明内容
本发明实施例提供了一种无源光网络调制格式切换的方法、装置和系统，用于无源光网络支持多种调制方式情况下，实现光网络单元的注册上线以及调制格式的切换。
一方面，提供了一种无源光网络调制格式切换的方法。该方法由PON系统局端侧中的光线路终端执行，并由光线路终端实现与光网络单元的交互。比如，光线路终端以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；然后光线路终端接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；然后光线路终端根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。
在一个可能的设计中，光线路终端接收光网络单元上报的第二消息，所述第二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示，光线路终端还切换到所述目标上行调制格式和/或目标下行调制格式，并以所述目标上行调制格式和/或目标下行调制格式下发确认授权消息并与所述光网络单元进行同步确认。
在一个可能的设计中，光线路终端接收所述光网络单元上报的第三消息，所述第三消息包括接收误码信息，光线路终端还根据所述第三消息，确定光网络单元完成上行调制格式和/或下行调制格式切换。
在一个可能的设计中，光线路终端下发第四消息给光网络单元，通知光网络单元切换回源上行调制格式和/或源下行调制格式。
另一方面，提供了一种无源光网络调制格式切换的方法。具体的，光网络单元上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；然后，光网络单元接收所述光线路终端下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；然后光网络单元将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
在一个可能的设计中，光网络单元上报第二消息给光线路终端，所述第 二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示消息；光网络单元还接收光线路终端下发的确认授权消息并与所述光线路终端进行同步确认。
在一个可能的设计中，光网络单元上报第三消息给光线路终端，所述第三消息包括接收误码信息。
在一个可能的设计中，光网络单元接收光线路终端下发的第四消息，所述第四消息包括指示所述光网络单元切换回源上行调制格式和/或源下行调制格式；光网络单元还切换回源上行调制格式和/或源下行调制格式。
另一方面，提供了一种光线路终端，包括第一发送单元，用于以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；以及发送通知消息给光网络单元，所述通知消息用于通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式；第一接收单元，用于接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；第一处理单元，用于根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式。
另一方面，提供了一种光网络单元，包括第二发送单元，用于上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；第二接收单元，用于接收所述光线路终端下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；第二处理单元，用于将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
另一方面，提供了一种无源光网络系统，包括上述的光线路终端和上述的光网络单元。
另一方面，提供了一种网元，包括存储器，用于存储计算机可执行程序代码；收发器，以及处理器，与所述存储器和所述收发器耦合；
其中所述程序代码包括指令，当所述处理器执行所述指令时，所述指令使所述通信装置执行以下操作：以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。
另一方面，提供了一种网元，包括存储器，用于存储计算机可执行程序代码；收发器，以及处理器，与所述存储器和所述收发器耦合；
其中所述程序代码包括指令，当所述处理器执行所述指令时，所述指令使所述通信装置执行以下操作：上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；接收所述光线路终端下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
由上述技术方案可知，本发明OLT以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元，然后OLT接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力，最后OLT根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。从而使得支持多种调制格式PON系统，增加ONU的调制格式上报能力，实现ONU注册上线以及注册上线之后的调制方式的切换。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为无源光网络系统的框架结构图；
图2为多种调制方式共存的无源光网络系统图；
图3为本发明实施例公开的一种PON系统调制格式切换的方法流程图；
图4为本发明实施例公开的下行调制方式可调场景下ONU注册上线流程图；
图5为本发明实施例公开的下行调制格式可调场景下ONU切换调制格式流程图；
图6为本发明实施例公开的上行调制格式可调场景下ONU切换调制格式流程图；
图7为本发明实施例公开的一种光线路终端框图；
图8为本发明实施例公开的一种光网络单元框图；
图9为本发明实施例的一网元的结构示意图；
图10为本发明实施例的另一网元的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
如图2所示，图2为多种调制方式共存的PON系统，对于ONU1来说，采用的是双二进制调制方式，最大传输速率可达20G。对于ONU2来说，采用的是PAM8阶调制方式，最大传输速率可达30G。对于ONU3来说，采用的是PAM4阶调制方式，最大传输速率可达20G。对于ONU4来说，采用的是PAM2阶调制方式，最大传输速率可达10G。上述各种调制方式之间可以共存，比如NRZ和PAM4共存，或者Duo-binary和PAM4共存，甚至两种以上调制方式共存情况。
如图3所示，图3为本发明实施例公开的一种PON系统调制格式切换的方法流程图，包括步骤：
步骤301：OLT下发所能支持的所有调制格式，通知ONU。需要说明的是，ONU注册前先学习OLT支持的所有上行调制格式和/或下行调制格式能力。
步骤302：OLT以支持的所有上行调制格式和/或下行调制格式分别轮询发注册开窗，即以广播形式分别下发注册消息给ONU。
步骤303：ONU判断此注册开窗是否满足其当前上行调制格式和/或下行调制格式，若满足，则以当前所支持的上行调制格式和/或下行调制格式注册上线，并上报第一消息，第一消息包括上行调制格式能力和/或下行调制格式能力，若不满足，则暂停注册。
步骤304：OLT接收ONU上报的第一消息。
步骤305：OLT根据所述第一消息，确定ONU的目标上行调制格式和/或目标下行调制格式，通知ONU切换到所述目标上行调制格式和/或目标下行 调制格式。
步骤306：ONU接收OLT下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式。
步骤307：ONU将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
步骤308：ONU上报第二消息给OLT，所述第二消息包括ONU完成切换到所述目标上行调制格式和/或目标下行调制格式的指示消息。
在该步骤的另一实施方式中，ONU上报第二消息给OLT后判断是否在第二预设时间内收到光线路终端下发的确认授权消息，如果否，则切换回源上行调制格式和/或源下行调制格式。
步骤309：OLT接收光网络单元上报的第二消息，所述第二消息包括ONU完成切换到所述目标上行调制格式和/或目标下行调制格式的指示。
步骤310：OLT切换到所述目标上行调制格式和/或目标下行调制格式，并以所述目标上行调制格式和/或目标下行调制格式下发确认授权消息并与所述光网络单元进行同步确认。
该步骤中，另一实施例中，OLT下发确认授权消息，启用超时机制，OLT判断所述光网络单元是否在第一预设时间内收到所述确认授权消息，如果否，则计数器加一。然后OLT判断计数器的值是否大于阈值，如果是，则结束上行调制格式和/或下行调制格式的切换。
步骤311：ONU接收OLT下发的确认授权消息并与所述OLT进行同步确认。
步骤312：ONU上报第三消息给OLT，所述第三消息包括接收误码信息。
步骤313：OLT根据所述第三消息，确定ONU完成上行调制格式和/或下行调制格式切换，或者进入步骤314。
步骤314：通知ONU切换回源上行调制格式和/或源下行调制格式。
本发明实施例针对支持多种调制格式PON系统，增加ONU的调制格式上报能力，实现ONU注册上线以及注册上线之后的调制方式的切换。
需要说明的是，要完成上述下行调制格式和/或上行调制格式切换，需要对协议消息进行扩展。
一种方式是，如图4所示，ONU注册时通过扩展MPCP(Multi-Point  Control Protocol，多点控制协议)实现调制格式切换，比如(1)扩展GATE消息，新增此开窗所支持的下行和/或上行调制格式；(2)扩展REGISTER_REQ消息，新增ONU下行和/或上行调制格式能力信息。
另一种方式是，如图5所示，通过扩展MPCP消息实现调制格式切换，新增MODULATION_REQ，MODULATION_ACK MPCPDU等消息，其中：MODULAITON_REQ MPCPDU包括LLID(Logical Link Identifier，逻辑链路标记)，Target Downstream Modulation(目标下行调制格式)等信息。MODULATION_ACK MPCPDU包括echo of LLID，echo of target Downstream Modulation，echo of Sync(同步响应)，ONU接收误码等信息。
上述扩展MPCP消息也可通过扩展OAM(Operation Administration and Maintenance，操作管理维护)或PLOAM(Physical Layer Operations,Administration and Maintenance，物理层操作管理和维护)消息替代，比如通过ONU的Information OAMPDU信息扩展进行下行和/或上行调制格式信息上报；通过新增MODULATION_REQ OAMPDU及MODULATION_ACK OAMPDU实现调制格式切换。其中OAMPDU实现调制格式切换流程同MPCP切换流程。
如图6所示，第三种方式是，扩展REGISTER_REQ MPCPDU中的Discovery Information Fields，在Discovery Information Fields的Bit6-15扩展，增加例如：ONU upstream is PAM4 capable；ONU upstream is PAM8 capable等等实现调制格式注册流程。或者扩展REGISTER_REQ MPCPDU，新增Modulation Information Fields(调制信息字段)，在Modulation Information Fields新增bit位，例如：ONU upstream is PAM4 capable(ONU上行PAM4可用)；ONU upstream is PAM8 capable(ONU上行PAM8可用)等等。新增OPCODE类型：MODULATION_REQ及MODULATION_ACK MPCPDU。MODULATION_REQ MPCPDU包括LLID，Target Upstream Modulation等信息；MODULATION MPCPDU包括echo of LLID，echo of target Upstream Modulation等信息。此扩展的MPCP消息可通过扩展OAM或PLOAM消息替代。
如图7所示，本发明还公开了一种光线路终端OLT，包括：
第一发送单元701，用于以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；以及发送通知消息给光网络单元，通知消 息用于通知光网络单元切换到目标上行调制格式和/或目标下行调制格式。
第一接收单元702，用于接收光网络单元上报的第一消息，其中第一消息包括上行调制格式能力和/或下行调制格式能力。
第一处理单元703，用于根据第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式。
可选的，第一接收单元703，还用于接收光网络单元上报的第二消息，第二消息包括所述光网络单元完成切换到目标上行调制格式和/或目标下行调制格式的指示。第一处理单元702，还用于将光线路终端切换到目标上行调制格式和/或目标下行调制格式。第一发送单元701，还用于以目标上行调制格式和/或目标下行调制格式下发确认授权消息并与光网络单元进行同步确认。
可选的，第一接收单元702，还用于接收所述光网络单元上报的第三消息，第三消息包括接收误码信息。第一处理单元703，还用于根据第三消息，确定光网络单元完成上行调制格式和/或下行调制格式切换。
可选的，第一发送单元701，还用于下发第四消息给光网络单元，第四消息用于通知光网络单元切换回源上行调制格式和/或源下行调制格式。
可选的，第一处理单元703，还用于判断光网络单元是否在第一预设时间内收到确认授权消息，如果否，则计数器加一；以及用于判断计数器的值是否大于阈值，如果是，则结束上行调制格式和/或下行调制格式的切换。
如图8所示，本发明还公开了一种光网络单元ONU，包括：
第二发送单元801，用于上报第一消息给光线路终端，第一消息包括上行调制格式能力和/或下行调制格式能力；
第二接收单元802，用于接收光线路终端下发的通知消息，通知消息包括目标上行调制格式和/或目标下行调制格式；
第二处理单元803，用于将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
另一实施例中，所述第二发送单元801，还用于上报第二消息给光线路终端，第二消息包括光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示消息。第二接收单元802，还用于接收光线路终端下发的确认授权消息。第二处理单元803，还用于与光线路终端进行同步确认。
另一实施例中，第二发送单元801，还用于上报第三消息给光线路终端，第三消息包括接收误码信息。
另一实施例中，第二接收单元802，还用于接收光线路终端下发的第四消息，第四消息包括指示光网络单元切换回源上行调制格式和/或源下行调制格式。第二处理单元803，还用于将光网络单元切换回源上行调制格式和/或源下行调制格式。
另一实施例中，第二处理单元803，还用于判断是否在第二预设时间内收到光线路终端下发的确认授权消息，如果否，则将光网络单元切换回源上行调制格式和/或源下行调制格式。
本发明实施例还公开了一种无源光网络，如图1所示，包括上述实施例以及图7所示的光线路终端和上述实施例以及图8所示的光网络单元。
图9显示了本发明实施例提供的作为光线路终端的结构示意图，这一网元用于在图2所示的PON系统中传送或处理数据。网元900可包含一个或多个端口908，与收发器(transceiver)906相耦合。收发器906可以是发射器，接收器或其组合，从其他网络节点通过端口912发送或接收数据包。处理器902耦合到收发器906，用于处理数据包。处理器902可包含一个或多个多核处理器和/或存储器904。处理器902可以是一个通用处理器，专用集成电路(Application Specific Integrated Circuit，ASIC)，或数字信号处理器(DSP)。
存储器904可为非瞬时性的存储介质，与处理器902相耦合，用于保存不同类型的数据。存储器904可包含只读存储器(Read Only Memory，ROM),随机存取存储器(Random Access Memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是磁盘存储器。存储器904可用于保存实现PON系统或相关方法的指令。可以理解，通过编程或装载可执行指令到网元900的处理器902，缓存和长期存储中的至少一个。
网元900可实现根据本发明的实施例执行一个或多个指令以获取业务链信息。这些指令可存储在存储器904中，也可集成在网元的操作系统的内核或内核的插件中。
另一个实施例中，网元900作为光线路终端，包括存储器904，处理器902和收发器906以及与收发器耦合的一个或多个端口908。存储器904，用 于存储计算机可执行程序代码；处理器902与所述存储器904和所述收发器906耦合；
其中所述程序代码包括指令，当所述处理器执行所述指令时，所述指令使所述网元执行以下操作：以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。
以上作为光线路终端的网元包含的处理器所执行操作的具体实现方式可以参照图3的实施例的中由光线路终端执行的对应步骤，本发明实施例不再赘述。
图10为本发明实施例提供的作为光网络单元的网元的结构示意图。网元1000可包含一个或多个端口1008，与收发器(transceiver)1006相耦合。收发器1006可以是发射器，接收器或其组合，从其他网络节点通过端口1008发送或接收数据包。处理器1002耦合到收发器1006，用于处理数据包。处理器1002可包含一个或多个多核处理器和/或存储器1004。处理器1002可以是一个通用处理器，专用集成电路(Application Specific Integrated Circuit，ASIC)，或数字信号处理器(DSP)。
存储器1004可为非瞬时性的存储介质，与处理器1002相耦合，用于保存不同类型的数据。存储器1004可包含只读存储器(Read Only Memory，ROM),随机存取存储器(Random Access Memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是磁盘存储器。存储器1004可用于保存实现NFV系统或相关方法的指令。可以理解，通过编程或装载可执行指令到网元1000的处理器1002，缓存和长期存储中的至少一个。
另一个实施例中，网元1000作为光网络单元，包括存储器1004，处理器1002和收发器1006以及与收发器耦合的一个或多个端口1008。存储器1004，用于存储计算机可执行程序代码；处理器1002与所述存储器1004和所述收发器1006耦合；
其中所述程序代码包括指令，当所述处理器执行所述指令时，所述指令使所述网元执行以下操作：上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；接收所述光线路终端下发的通知 消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
以上作为光网络单元的网元包含的处理器所执行操作的具体实现方式可以参照图3的实施例的中由光网络单元执行的对应步骤，本发明实施例不再赘述。
本领域普通技术人员应该了解本申请的所有或部分标的物可在结合硬件和/或固件的软件中实施。例如，本文描述的标的物可在一个或多个处理器执行的软件中实施。在一项示例性实施方式中，本文描述的标的物可使用存储有计算机可执行指令的非瞬时计算机可读介质实施，当计算机处理器执行该计算机可执行指令时，该指令控制计算机执行步骤。适于实施本文描述的标的物的示例计算机可读介质包括非瞬时计算机可读介质，例如磁盘存储器设备、芯片存储器设备、可编程逻辑设备和专用集成电路。另外，实施本文描述的标的物的计算机可读介质可位于单个设备或计算平台上，或可在多个设备或计算平台上分发。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (21)

  1. 一种无源光网络调制格式切换的方法，其特征在于，包括：
    以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；
    接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；
    根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式，通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式。
  2. 根据权利要求1所述的方法，其特征在于，所述通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式之后进一步包括：
    接收光网络单元上报的第二消息，所述第二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示；
    切换到所述目标上行调制格式和/或目标下行调制格式，并以所述目标上行调制格式和/或目标下行调制格式下发确认授权消息并与所述光网络单元进行同步确认。
  3. 根据权利要求2所述的方法，其特征在于，所述按照所述目标调制格式下发确认授权消息并与所述光网络单元进行同步确认之后还进一步包括：
    接收所述光网络单元上报的第三消息，所述第三消息包括接收误码信息；
    根据所述第三消息，确定光网络单元完成上行调制格式和/或下行调制格式切换。
  4. 根据权利要求3所述的方法，其特征在于，还进一步包括：
    下发第四消息给光网络单元，通知光网络单元切换回源上行调制格式和/或源下行调制格式。
  5. 根据权利要求2所述的方法，其特征在于，所述以所述目标上行调制格式和/或目标下行调制格式下发确认授权消息之后进一步包括：
    判断所述光网络单元是否在第一预设时间内收到所述确认授权消息，如果否，则计数器加一；
    判断计数器的值是否大于阈值，如果是，则结束上行调制格式和/或下行 调制格式的切换。
  6. 一种无源光网络调制格式切换的方法，其特征在于，包括：
    上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；
    接收所述光线路终端下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；
    将上行调制格式和/或下行调制格式切换到所述目标上行调制格式和/或目标下行调制格式。
  7. 根据权利要求6所述的方法，其特征在于，所述通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式之后进一步包括：
    上报第二消息给光线路终端，所述第二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示消息；
    接收光线路终端下发的确认授权消息并与所述光线路终端进行同步确认。
  8. 根据权利要求7所述的方法，其特征在于，所述接收光线路终端下发的确认授权消息并与所述光线路终端进行同步确认之后还进一步包括：
    上报第三消息给光线路终端，所述第三消息包括接收误码信息。
  9. 根据权利要求8所述的方法，其特征在于，还进一步包括：
    接收光线路终端下发的第四消息，所述第四消息包括指示所述光网络单元切换回源上行调制格式和/或源下行调制格式；
    切换回源上行调制格式和/或源下行调制格式。
  10. 根据权利要求7所述的方法，其特征在于，所述上报第二消息给光线路终端之后还进一步包括：
    判断是否在第二预设时间内收到光线路终端下发的确认授权消息，如果否，则切换回源上行调制格式和/或源下行调制格式。
  11. 一种光线路终端，其特征在于，包括：
    第一发送单元，用于以支持的所有上行调制格式和/或下行调制格式分别下发注册消息给光网络单元；以及发送通知消息给光网络单元，所述通知消息用于通知光网络单元切换到所述目标上行调制格式和/或目标下行调制格式；
    第一接收单元，用于接收光网络单元上报的第一消息，所述第一消息包括上行调制格式能力和/或下行调制格式能力；
    第一处理单元，用于根据所述第一消息，确定光网络单元的目标上行调制格式和/或目标下行调制格式。
  12. 根据权利要求11所述的光线路终端，其特征在于，
    所述第一接收单元，还用于接收所述光网络单元上报的第二消息，所述第二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示；
    所述第一处理单元，还用于将所述光线路终端切换到所述目标上行调制格式和/或目标下行调制格式；
    所述第一发送单元，还用于以所述目标上行调制格式和/或目标下行调制格式下发确认授权消息并与所述光网络单元进行同步确认。
  13. 根据权利要求12所述的光线路终端，其特征在于，
    所述第一接收单元，还用于接收所述光网络单元上报的第三消息，所述第三消息包括接收误码信息；
    所述第一处理单元，还用于根据所述第三消息，确定光网络单元完成上行调制格式和/或下行调制格式切换。
  14. 根据权利要求13所述的光线路终端，其特征在于，
    所述第一发送单元，还用于下发第四消息给光网络单元，所述第四消息用于通知光网络单元切换回源上行调制格式和/或源下行调制格式。
  15. 根据权利要求12所述的光线路终端，其特征在于，
    所述第一处理单元，还用于判断所述光网络单元是否在第一预设时间内收到所述确认授权消息，如果否，则计数器加一；以及用于判断计数器的值是否大于阈值，如果是，则结束上行调制格式和/或下行调制格式的切换。
  16. 一种光网络单元，其特征在于，包括：
    第二发送单元，用于上报第一消息给光线路终端，所述第一消息包括上行调制格式能力和/或下行调制格式能力；
    第二接收单元，用于接收所述光线路终端下发的通知消息，所述通知消息包括目标上行调制格式和/或目标下行调制格式；
    第二处理单元，用于将上行调制格式和/或下行调制格式切换到所述目标 上行调制格式和/或目标下行调制格式。
  17. 根据权利要求16所述的光网络单元，其特征在于，
    所述第二发送单元，还用于上报第二消息给光线路终端，所述第二消息包括所述光网络单元完成切换到所述目标上行调制格式和/或目标下行调制格式的指示消息；
    所述第二接收单元，还用于接收光线路终端下发的确认授权消息；
    所述第二处理单元，还用于与所述光线路终端进行同步确认。
  18. 根据权利要求17所述的光网络单元，其特征在于，
    所述第二发送单元，还用于上报第三消息给光线路终端，所述第三消息包括接收误码信息。
  19. 根据权利要求17所述的光网络单元，其特征在于，
    所述第二接收单元，还用于接收光线路终端下发的第四消息，所述第四消息包括指示所述光网络单元切换回源上行调制格式和/或源下行调制格式；
    所述第二处理单元，还用于将所述光网络单元切换回源上行调制格式和/或源下行调制格式。
  20. 根据权利要求17所述的光网络单元，其特征在于，
    所述第二处理单元，还用于判断上报第二消息给光线路终端后是否在第二预设时间内收到光线路终端下发的确认授权消息，如果否，则将所述光网络单元切换回源上行调制格式和/或源下行调制格式。
  21. 一种无源光网络，其特征在于，包括权利要求11-15任一项所述的光线路终端和权利要求16-20任一项所述的光网络单元。
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