WO2018094606A1 - 无源光网络系统、光线路终端及光网络单元 - Google Patents

无源光网络系统、光线路终端及光网络单元 Download PDF

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Publication number
WO2018094606A1
WO2018094606A1 PCT/CN2016/106919 CN2016106919W WO2018094606A1 WO 2018094606 A1 WO2018094606 A1 WO 2018094606A1 CN 2016106919 W CN2016106919 W CN 2016106919W WO 2018094606 A1 WO2018094606 A1 WO 2018094606A1
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Prior art keywords
uplink
module
channel
onu
data
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PCT/CN2016/106919
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English (en)
French (fr)
Inventor
林华枫
殷锦蓉
赵殿博
万席锋
聂世玮
郑刚
罗侄敬
曾小飞
罗俊
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华为技术有限公司
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Priority to MYPI2019002903A priority Critical patent/MY201300A/en
Priority to CA3044720A priority patent/CA3044720C/en
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680086538.6A priority patent/CN109314569B/zh
Priority to BR112019010491-7A priority patent/BR112019010491B1/pt
Priority to KR1020197017764A priority patent/KR102217710B1/ko
Priority to JP2019527907A priority patent/JP7026686B2/ja
Priority to CN202010590256.8A priority patent/CN111885435A/zh
Priority to PCT/CN2016/106919 priority patent/WO2018094606A1/zh
Priority to EP16922324.5A priority patent/EP3537628B1/en
Priority to MX2019006008A priority patent/MX2019006008A/es
Priority to ES16922324T priority patent/ES2906748T3/es
Priority to RU2019118792A priority patent/RU2722434C1/ru
Priority to AU2016430261A priority patent/AU2016430261B2/en
Publication of WO2018094606A1 publication Critical patent/WO2018094606A1/zh
Priority to US16/418,886 priority patent/US10756841B2/en
Priority to US16/988,066 priority patent/US11374674B2/en

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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
    • 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
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
    • H04J14/0235—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for upstream transmission
    • H04J14/0236—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for upstream transmission using multiple wavelengths
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2581—Multimode transmission
    • 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
    • H04B10/271—Combination of different networks, e.g. star and ring configuration in the same network or two ring networks interconnected
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • 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
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
    • H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
    • 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
    • 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
    • H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • 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
    • H04Q2011/0064—Arbitration, scheduling or medium access control 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
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation
    • 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
    • H04Q2011/0088—Signalling aspects

Definitions

  • the present invention relates to the field of optical communications, and in particular to a passive optical network (PON) system, an optical line terminal (OLT), and an optical network unit (ONU).
  • PON passive optical network
  • ONT optical line terminal
  • ONU optical network unit
  • a passive optical network is a point-to-multipoint network topology. It usually includes an optical line terminal (OLT) at the central office and multiple optical network units at the user end. Network Unit (ONU) and an Optical Distribution Network (ODN) located between the two.
  • OLT optical line terminal
  • ONU Network Unit
  • ODN Optical Distribution Network
  • the newly added ONU needs to complete the registration activation at the OLT before sending the uplink service data to the OLT through the uplink channel.
  • the OLT receives the registration response message sent by the new ONU through the uplink channel by means of a Quiet Zone, so that the registration response packet is received.
  • the Media Access Control (MAC) address is assigned to the newly added ONU to assign a Logical Link IDentifier (LLID) and complete the ranging to the new ONU.
  • LLID Logical Link IDentifier
  • the OLT receives the registration response message sent by the newly added ONU by opening a silent window, and then assigns the ONU ID according to the serial number (SN) carried in the registration response message. And further complete the ranging of the new ONU.
  • Gigabit Gigabit Passive Optical Network
  • GPON Gigabit-Capable Passive Optical Network
  • the registered ONUs use the Time Division Multiple Access (TDMA) to send uplink service data to the OLT through the uplink channel according to the uplink transmission time slot allocated by the OLT, so as to avoid uplink services sent by different ONUs.
  • TDMA Time Division Multiple Access
  • the data creates a collision on the upstream channel.
  • the OLT will stop performing bandwidth authorization for the registered ONU, that is, the registered ONU will stop sending uplink service data. .
  • a registered ONU needs to send uplink service data after the end of the silent window, resulting in a large delay in the transmission of uplink service data, which cannot meet the delay of the low-latency service. Demand.
  • a PON system in a first aspect, includes: an OLT and at least two ONUs.
  • the OLT is connected to each ONU through an ODN, and the OLT and the at least two ONUs pass a downlink channel and two uplink channels. Perform data interaction;
  • the OLT sends downlink data to each ONU through the downlink channel, where the downlink data includes an uplink bandwidth grant, and the uplink bandwidth grant is used to control the ONU to send uplink data.
  • the ONU receives the downlink data through the downlink channel, and sends the uplink data through the first uplink channel or the second uplink channel according to the uplink bandwidth authorization included in the downlink data.
  • the OLT receives the uplink data sent by each ONU through the first uplink channel and the second uplink channel;
  • the first uplink channel closes the registration function
  • the second uplink channel enables the registration function
  • the registration function is used to register the unregistered ONU.
  • the PON system performs data interaction only through one downlink channel and one uplink channel.
  • the PON system by setting a downlink channel in the PON system, closing the first uplink channel of the registration function, and opening the registration function.
  • the OLT sends the downlink data to the ONUs through the downlink channel
  • the ONU can allocate the uplink service data and the ONU registration to different uplink channels according to the uplink bandwidth authorization included in the downlink data, thereby avoiding the ONU registration and uplink.
  • the impact of the transmission of service data meets the demand for system delay of low-latency services.
  • the downlink data includes a first uplink bandwidth grant and a second uplink bandwidth grant, where the first uplink bandwidth grant is used to control the ONU to send uplink data on the first uplink channel, and the second uplink bandwidth grant is used for control.
  • the ONU sends uplink data on the second uplink channel.
  • the OLT generates a first uplink bandwidth grant and a second uplink bandwidth grant; and multiplexes the first uplink bandwidth grant and the second uplink bandwidth grant to obtain the multiplexed uplink bandwidth grant;
  • the ONU demultiplexes the received uplink bandwidth grant to obtain a first uplink bandwidth grant and a second uplink bandwidth, and sends uplink data on the first uplink channel according to the first uplink bandwidth grant;
  • the second uplink bandwidth grant sends uplink data on the second uplink channel.
  • the OLT generates a first uplink bandwidth authorization and a second uplink bandwidth authorization for controlling the first uplink channel and the second uplink channel, respectively, and multiplexing the first uplink bandwidth authorization and the second uplink bandwidth authorization. Therefore, the multiplexed uplink bandwidth grant is provided to each ONU through the downlink channel, so that the ONU can control the data transmission of the first uplink channel and the second uplink channel according to the received uplink bandwidth authorization, respectively, to ensure that the uplink data passes the first The uplink channel and the second uplink channel reach the OLT in an orderly manner to avoid collision between uplink data.
  • the first uplink channel is used for transmitting uplink service data
  • the second uplink channel is used for transmitting a registration response message
  • the OLT generates a first uplink bandwidth grant including an uplink transmission slot; and generates a second uplink bandwidth grant including the registration slot;
  • the uplink service time slot in the first uplink bandwidth authorization is used to send uplink service data to the OLT through the first uplink channel;
  • the registration response packet is sent to the OLT through the second uplink channel according to the registration time slot in the second uplink bandwidth authorization.
  • the ONU sends the uplink service data transmission and the uplink registration message to the OLT through the same uplink channel.
  • the ONU passes the first uplink channel according to its registration state when it is in the registered state. Sending uplink service data to the OLT to perform service communication with the OLT; when in the unregistered state, sending a registration response message through the second uplink channel OLT, thereby completing registration at the OLT, so that the unregistered ONU in the PON system is At the same time of registration, the registered ONU can still send uplink service data to the OLT, thereby avoiding the delay caused by the ONU registration in the PON system.
  • the first uplink channel is used to transmit the first uplink service data
  • the second uplink channel is used to transmit the registration response message and the second uplink service data
  • the OLT generates a first uplink bandwidth grant including a first uplink transmission slot; and generates a second uplink bandwidth grant including the second uplink transmission slot and the registration slot;
  • the ONU When the ONU is in the registered state, according to the first uplink sending time slot in the first uplink bandwidth grant, the first uplink service data is sent to the OLT through the first uplink channel; and the second uplink sending time slot in the second uplink bandwidth grant is used. Transmitting, by using the second uplink channel, second uplink service data to the OLT;
  • the registration response packet is sent to the OLT through the second uplink channel according to the registration time slot in the second uplink bandwidth authorization.
  • the ONU sends the uplink service data of the low-latency service through the first uplink channel, and sends the uplink service data of the high-latency service and the ONU registration through the second uplink channel, thereby preventing the ONU registration from affecting the low-latency service.
  • the dual uplink channel is used for service data transmission, which improves the transmission rate of the uplink service data.
  • the OLT acquires the channel transmission quality of the first uplink channel and the second uplink channel; when the channel transmission quality of the first uplink channel is better than the channel transmission quality of the second uplink channel, the first uplink channel is controlled to be closed.
  • the registration function controls the second uplink channel to open the registration function.
  • the OLT can flexibly configure the opening or closing of the registration function on the uplink channel according to the channel transmission quality of the first uplink channel and the second uplink channel, so as to ensure that the low-latency service can be transmitted on the uplink channel with better transmission quality.
  • the data transmission quality of the PON system is further improved.
  • the OLT stores the generated upstream bandwidth grant
  • the OLT controls uplink data reception according to the uplink bandwidth grant, and/or performs authentication and analysis on the uplink data sent by each ONU according to the uplink bandwidth grant.
  • the OLT uses the generated uplink bandwidth grant to control the receiving of the uplink data, thereby improving the accuracy of the uplink data receiving.
  • the OLT uses the uplink bandwidth grant to authenticate the received uplink data, thereby sending the illegal ONU.
  • the uplink data is filtered to prevent the illegally accessed ONU from affecting the PON system, thereby further improving the security of the PON system.
  • the ONU determines the service classification to which each service belongs according to the delay requirements of each service
  • the ONU When the service classification indicates that the service belongs to the first category, the ONU sends the uplink data corresponding to the service through the first uplink channel.
  • the ONU When the service classification indicates that the service belongs to the second category, the ONU sends the uplink data corresponding to the service through the second uplink channel.
  • the delay requirement of the service belonging to the first category is higher than the delay requirement of the service belonging to the second category.
  • the ONU classifies the service according to the delay requirement of the service, and selects the first uplink channel that closes the registration function to send the uplink data corresponding to the low-latency service, and selects the second uplink channel that starts the registration function to send the high-latency service corresponding.
  • Upstream data to ensure low latency services are not subject to ONU The impact of the book meets the demand for system delay for low latency services.
  • the BWmap message carries an uplink bandwidth grant
  • the Gate message carries the upstream bandwidth grant.
  • the OLT uses different types of messages to carry uplink bandwidth grants, thereby implementing uplink control of the ONUs by using uplink bandwidth grants, and improving the applicability of the OLT.
  • the predetermined bit of the predetermined field in the BWmap message is used to identify the uplink channel corresponding to the BWmap message;
  • the Gate message When the Gate message carries the upstream bandwidth authorization, the newly added channel identifier field in the Gate message is used to identify the uplink channel corresponding to the Gate message, or the operation code of the Gate message is used to identify the uplink channel corresponding to the Gate message.
  • the predetermined field is a start time field or a GrantSize field, and the predetermined bit is the highest 1 bit or the highest 2 bits of the predetermined field.
  • the downlink channel, the first uplink channel, and the second uplink channel share the ODN in a wavelength division multiplexing manner, and the wavelengths of the first uplink channel and the second uplink channel are different.
  • the uplink and downlink channels in the PON system respectively adopt different wavelengths, and share the ODN by means of wavelength division multiplexing, thereby avoiding interference between the uplink and downlink channels and ensuring normal transmission of uplink data and downlink data.
  • an OLT in a second aspect, includes: at least one Dynamic Bandwidth Allocation (DBA) scheduling module, a Down Transmission Convergence (TC) module, an uplink TC module, a downlink transmitter, and a first An uplink burst receiver and a second uplink burst receiver;
  • DBA Dynamic Bandwidth Allocation
  • TC Down Transmission Convergence
  • the DBA scheduling module is configured to generate an uplink bandwidth authorization, and the uplink bandwidth authorization is used to control each ONU to send uplink data.
  • the downlink TC module is connected to the DBA scheduling module, and is configured to generate downlink data including an uplink bandwidth grant by using downlink frame aggregation.
  • the downlink transmitter is connected to the downlink TC module, and is configured to send downlink data to each ONU through the downlink channel;
  • the uplink TC module is connected to the first uplink burst receiver, and is configured to receive uplink data sent by each ONU on the first uplink channel by using the first uplink burst receiver;
  • the uplink TC module is further connected to the second uplink burst receiver for receiving by the second uplink burst Receiving uplink data sent by each ONU on the second uplink channel;
  • the first uplink channel closes the registration function
  • the second uplink channel enables the registration function
  • the registration function is used to register the unregistered ONU.
  • the OLT completes uplink service data reception and ONU registration through an uplink channel.
  • the OLT completes uplink service data by closing the first uplink channel of the registration function and the second uplink channel of the registration function.
  • the downlink data includes a first uplink bandwidth grant and a second uplink bandwidth grant, where the first uplink bandwidth grant is used to control the ONU to send uplink data on the first uplink channel, and the second uplink bandwidth grant is used for control.
  • the ONU sends uplink data on the second uplink channel.
  • the OLT includes a first DBA scheduling module, a second DBA scheduling module, and a multiplexing module;
  • the first DBA scheduling module is configured to generate a first uplink bandwidth authorization
  • the second DBA scheduling module is configured to generate a second uplink bandwidth authorization
  • the multiplexing module is connected to the first DBA scheduling module and the second DBA scheduling module, and is configured to reuse the first uplink bandwidth authorization and the second uplink bandwidth authorization.
  • the multiplexing module is further connected to the downlink TC module, and is configured to provide the multiplexed uplink bandwidth authorization to the downlink TC module.
  • the OLT generates a first uplink bandwidth authorization by using the first DBA scheduling module, generates a second uplink bandwidth authorization by using the second DBA scheduling module, and performs the first uplink bandwidth authorization and the second uplink bandwidth authorization by using the multiplexing module.
  • the multiplex is used to provide the multiplexed uplink bandwidth grant to each ONU through the downlink channel, so that the ONU can control the uplink data transmission of the first uplink channel and the second uplink channel according to the received uplink bandwidth grant to ensure uplink.
  • the data reaches the OLT through the first uplink channel and the second uplink channel in an orderly manner to avoid collision between uplink data.
  • the first uplink channel is used for transmitting uplink service data
  • the second uplink channel is used for transmitting a registration response message
  • a first DBA scheduling module configured to generate a first uplink bandwidth grant that includes an uplink sending time slot
  • a second DBA scheduling module configured to generate a second uplink bandwidth authorization including a registration time slot
  • the uplink sending time slot is used to indicate that the registered ONU sends uplink service data on the first uplink channel, and the registration time slot is used to indicate that the unregistered ONU sends the registration response on the second uplink channel. Message.
  • the OLT controls the first uplink channel to be used for transmitting the uplink service data only by using the first DBA scheduling module, and the second uplink channel is controlled by the second DBA scheduling module to transmit only the registration response packet, so that the PON system does not
  • the registered ONU sends the registration response message through the second uplink channel, and the registered ONU can still send the uplink service data through the first uplink channel, thereby avoiding the impact of the ONU registration on the uplink service data transmission.
  • the first uplink channel is used to transmit the first uplink service data
  • the second uplink channel is used to transmit the registration response message and the second uplink service data
  • a first DBA scheduling module configured to generate a first uplink bandwidth grant including a first uplink sending time slot
  • a second DBA scheduling module configured to generate a second uplink bandwidth grant including a second uplink sending time slot and a registration time slot;
  • the first uplink sending time slot is used to indicate that the registered ONU sends the first uplink service data on the first uplink channel
  • the second uplink sending time slot is used to indicate that the registered ONU sends the second uplink channel on the second uplink channel.
  • the uplink service data, the registration time slot is used to indicate that the unregistered ONU sends the registration response message on the second uplink channel
  • the delay requirement of the first uplink service data is higher than the delay requirement of the second uplink service data.
  • the OLT controls the first uplink channel to transmit only the uplink service data corresponding to the low-latency service
  • the second DBA scheduling module controls the second uplink channel to transmit the registration response message by using the first DBA scheduling module.
  • the uplink service data corresponding to the high-latency service is used to prevent the ONU registration from affecting the low-latency service, and uses the dual uplink channel to transmit the uplink service data, thereby improving the transmission rate of the uplink service data.
  • the OLT further includes a control module, and the control module is respectively connected to the first DBA scheduling module and the second DBA scheduling module;
  • control module configured to control the first DBA scheduling module to close the registration function, and control the second DBA scheduling module to open the registration function;
  • the second uplink bandwidth authorization generated by the second DBA scheduling module that has the registration function includes a registration time slot, where the registration time slot is used to indicate that the unregistered ONU sends the registration response message on the second uplink channel.
  • the first uplink channel and the second uplink channel are implemented.
  • Flexible configuration by setting a control module in the OLT, and using the control module to control the opening and closing registration functions of the first and second DBA scheduling modules, the first uplink channel and the second uplink channel are implemented.
  • the OLT includes a DBA scheduling module and a control module connected to the DBA scheduling module;
  • control module configured to control a DBA scheduling module to enable or disable the registration function
  • a DBA scheduling module configured to: when the registration function is disabled, generate a first uplink bandwidth grant including a first uplink sending time slot, or generate a first uplink bandwidth grant including a first uplink sending time slot, and include a second uplink sending identifier Second upstream bandwidth grant of the slot;
  • the DBA scheduling module is further configured to: when the registration function is enabled, generate a first uplink bandwidth grant including a first uplink sending time slot and a second uplink bandwidth grant including a registered time slot;
  • the first uplink sending time slot is used to indicate that the registered ONU sends the uplink service data on the first uplink channel
  • the second uplink sending time slot is used to indicate that the registered ONU sends the uplink service data on the second uplink channel.
  • the registration time slot is used to indicate that the unregistered ONU sends a registration response message on the second uplink channel.
  • the OLT controls the opening and closing registration function of the DBA scheduling module by using the control module, and the DBA scheduling module generates a corresponding first uplink bandwidth authorization and a second uplink bandwidth authorization according to the opening and closing state of the registration function, and implements the first uplink channel. And orderly management of the second upstream channel.
  • the OLT further includes a memory
  • the storage is connected to each DBA scheduling module, and is configured to store an uplink bandwidth authorization generated by each DBA scheduling module;
  • the uplink TC module is connected to the memory, and is configured to control the first uplink burst receiver and the second uplink burst receiver to receive uplink data according to the uplink bandwidth grant, and/or to perform uplink data sent by each ONU according to the uplink bandwidth grant. Right and analysis.
  • the uplink TC module uses the generated uplink bandwidth grant to control each uplink burst receiver to receive uplink data, thereby improving the accuracy of uplink data reception. Meanwhile, the uplink TC module uses the uplink bandwidth grant to receive the uplink data.
  • the authentication is performed to filter the uplink data sent by the illegal ONU to prevent the illegally accessed ONU from affecting the PON system, thereby further improving the security of the PON system.
  • the BWmap message carries the uplink bandwidth grant
  • the upstream message carries the upstream bandwidth grant.
  • the BWmap when the BWmap message carries the upstream bandwidth grant, the BWmap eliminates The predetermined bit of the predetermined field in the information is used to identify the uplink channel corresponding to the BWmap message;
  • the newly added channel identifier field in the Gate message is used to identify the uplink channel corresponding to the Gate message, or the operation code of the Gate message is used to identify the uplink channel corresponding to the Gate message;
  • the predetermined bit is the highest 1 bit or the highest 2 bits of the predetermined field.
  • the downlink channel, the first uplink channel, and the second uplink channel share the same optical distribution network ODN in a wavelength division multiplexing manner, and the wavelengths of the first uplink channel and the second uplink channel are different.
  • an ONU in a third aspect, includes: a downlink TC module, at least one DBA response module, an uplink TC module, a downlink receiver, a first uplink burst transmitter, and a second uplink burst transmitter;
  • the downlink TC module is respectively connected to the downlink receiver and the DBA response module, and is configured to provide downlink data received by the downlink receiver through the downlink channel to the DBA response module, and the downlink data is sent by the OLT;
  • the DBA response module is connected to the uplink TC module, and is configured to control the uplink TC module to send uplink data according to the uplink bandwidth authorization included in the downlink data.
  • the uplink TC module is connected to the first uplink burst transmitter, and is configured to send uplink data on the first uplink channel by using the first uplink burst transmitter;
  • the uplink TC module is connected to the second uplink burst transmitter, and is configured to send uplink data on the second uplink channel by using the second uplink burst transmitter;
  • the first uplink channel closes the registration function
  • the second uplink channel enables the registration function
  • the registration function is used to register the unregistered ONU.
  • the ONU completes the uplink service data transmission and the ONU registration through an uplink channel.
  • the ONU completes the uplink service data by closing the first uplink channel of the registration function and the second uplink channel of the registration function respectively.
  • the sending and ONU registration avoids the impact of the ONU registration on the uplink service data transmission, thereby meeting the system delay requirement of the low-latency service.
  • the downlink data includes a first uplink bandwidth grant and a second uplink bandwidth grant, where the first uplink bandwidth grant is used to control the ONU to send uplink data on the first uplink channel, and the second uplink bandwidth grant is used for control.
  • the ONU sends uplink data on the second uplink channel.
  • the ONU includes a first DBA response module, a second DBA response module, and a demultiplexing module;
  • the demultiplexing module is connected to the downlink TC module, and is configured to demultiplex the uplink bandwidth authorization received by the downlink TC module to obtain the first uplink bandwidth authorization and the second uplink bandwidth authorization.
  • the first DBA response module is connected to the demultiplexing module, and is configured to control, according to the first uplink bandwidth authorization, the uplink TC module to send uplink data by using the first uplink channel;
  • the second DBA response module is connected to the demultiplexing module, and is configured to control the uplink TC module to send uplink data by using the second uplink channel according to the second uplink bandwidth authorization.
  • the ONU demultiplexes the uplink bandwidth authorization in the downlink data by using the demultiplexing module to obtain the first uplink bandwidth authorization and the second uplink bandwidth authorization, so as to be authorized according to the first uplink bandwidth.
  • the uplink data transmission is performed separately with the second uplink bandwidth authorization to ensure that the uplink data arrives at the OLT in an orderly manner to avoid conflicts between the uplink data.
  • the first uplink channel is used for transmitting uplink service data
  • the second uplink channel is used for transmitting a registration response message
  • the uplink TC module is configured to send a first enable signal to the first uplink burst transmitter according to the uplink sending time slot in the first uplink bandwidth grant, where the first enable signal is used to indicate the first An uplink burst transmitter transmits uplink service data through the first uplink channel;
  • the uplink TC module is configured to send a second enable signal to the second uplink burst transmitter according to the registration time slot in the second uplink bandwidth grant, where the second enable signal is used to indicate the second
  • the uplink burst transmitter sends a registration response message through the second uplink channel.
  • the first uplink channel is configured to transmit only uplink service data
  • the second uplink channel is configured to transmit only the registration response message, so that the unregistered ONU in the PON system is sent through the second uplink channel.
  • the response message is registered, the registered ONU can send the uplink service data through the first uplink channel, thereby avoiding the impact of the registration data packet on the uplink service data transmission.
  • the ONU includes an optical module slot, and the optical module slot is used to insert the first optical module or the second optical module;
  • the first optical module includes at least a downlink receiver and the first uplink burst transmitter
  • the second optical module includes at least a downlink receiver and a second uplink burst transmitter
  • the second optical module When the ONU is in the unregistered state, the second optical module is inserted into the optical module slot. When the ONU is in the registered state, the first optical module is inserted into the optical module slot.
  • the downlink receiver and the second uplink burst transmitter are integrated into the second optical module, so that different new The ONU can use the same second optical module to complete the ONU registration, thereby improving the utilization rate of the second uplink burst transmitter and reducing the manufacturing cost of the ONU.
  • the first uplink channel is used to transmit the first uplink service data
  • the second uplink channel is used to transmit the registration response message and the second uplink service data
  • the delay requirement of the first uplink service data is higher than the first The delay requirement of the second uplink service data
  • the uplink TC module is configured to send a third enable signal to the first uplink burst transmitter according to the first uplink sending time slot in the first uplink bandwidth grant, where the third enable signal is used. Instructing the first uplink burst transmitter to send the first uplink service data by using the first uplink channel, and sending the fourth uplink signal to the second uplink burst transmitter according to the second uplink sending time slot in the second uplink bandwidth grant, The fourth enable signal is used to instruct the second uplink burst transmitter to send the second uplink service data by using the second uplink channel;
  • the uplink TC module is configured to send a fifth enable signal to the second uplink burst transmitter according to the registration time slot in the second uplink bandwidth grant, where the fifth enable signal is used to indicate the second
  • the uplink burst transmitter sends a registration response message through the second uplink channel.
  • the first uplink channel is configured to transmit only the first uplink service data
  • the second uplink channel is configured to transmit the registration response message and the second uplink service data, and the ONU registration is not correct.
  • the uplink service data transmission is performed by using two uplink channels at the same time, thereby improving the transmission rate of the uplink service data in the PON system.
  • the ONU further includes a service classification module
  • a service classification module is configured to collect delay requirements of each service, and determine a service classification to which each service belongs according to the delay requirement;
  • the DBA response module is connected to the service classification module, and is configured to: when the service classification indicates that the service belongs to the first classification, control the uplink TC module to send the first uplink service data corresponding to the service by using the first uplink channel;
  • the DBA response module is further configured to: when the service classification indicates that the service belongs to the second category, control the uplink TC module to send the second uplink service data corresponding to the service by using the second uplink channel.
  • the ONU classifies the service by using the service classification module, and selects the first uplink channel that closes the registration function to send the uplink data corresponding to the low-latency service, and selects the second uplink channel that starts the registration function to send the uplink corresponding to the high-latency service.
  • Data ensures that low-latency services are not affected by ONU registration and meet the system latency requirements of low-latency services.
  • the ONU includes a first optical module slot and a second optical module slot, An optical module slot is used for inserting a first optical module, and a second optical module slot is for inserting a second optical module;
  • the first optical module includes at least a first uplink burst transmitter
  • the second optical module includes at least a downlink receiver and a second uplink burst transmitter
  • the second optical module is inserted into the slot of the second optical module when the second uplink service data is transmitted.
  • the second optical module is inserted into the slot of the second optical module.
  • the first optical module is inserted into the slot of the first optical module.
  • the ONU includes a DBA response module and a channel selection module;
  • the channel selection module is respectively connected to the first uplink burst transmitter, the second uplink burst transmitter, and the uplink TC module;
  • the DBA response module is configured to control, according to the first uplink bandwidth authorization, the uplink TC module to send uplink service data, or control the uplink TC module to send the registration response message according to the second uplink bandwidth authorization;
  • a channel selection module configured to: when the ONU is in the registered state, select the first uplink burst transmitter to send the uplink service data generated by the uplink TC module, or select the second uplink burst transmitter when the ONU is in the unregistered state Send the registration response packet generated by the uplink TC module.
  • the channel selection module in the ONU sends the uplink service data through the first uplink channel according to the registration state of the ONU, or sends the registration corresponding message through the second uplink channel, thereby realizing dynamic energy saving of the ONU.
  • the BWmap message carries the uplink bandwidth grant
  • the upstream message carries the upstream bandwidth grant.
  • the predetermined bit of the predetermined field in the BWmap message is used to identify the uplink channel corresponding to the BWmap message;
  • the gateway message When the gateway message carries the uplink bandwidth authorization, the newly added channel identifier field in the Gate message is used to identify the uplink channel corresponding to the Gate message, or the operation code of the Gate message is used to identify the uplink channel corresponding to the Gate message.
  • the predetermined field is a start time field or a GrantSize field, and the predetermined bit is the highest 1 bit or the highest 2 bits of the predetermined field.
  • the downlink channel, the first uplink channel, and the second uplink channel share the same ODN in a wavelength division multiplexing manner, and the wavelengths of the first uplink channel and the second uplink channel are different.
  • FIG. 1 is a system architecture diagram of a PON system provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an OLT provided by the first embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an OLT provided by a second embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of an OLT provided by a third embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an ONU provided by the first embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of an ONU provided by a second embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an ONU provided by a third embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an ONU provided by a fourth embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an ONU provided by a fifth embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an ONU provided by a sixth embodiment of the present application.
  • FIG. 11 is a flowchart of a data interaction process in a PON system according to an embodiment of the present application.
  • FIG. 12 is a flow chart showing a data interaction process in a PON system provided by another embodiment of the present application.
  • Multiple as referred to herein means two or more. "and/or”, describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/" generally indicates that the contextual object is an "or" relationship.
  • the PON system includes only one downlink channel and one uplink channel OLT, that is, the downlink channel is transmitted through the downlink channel and uses time division multiplexing to send downlink data to the registered ONU; correspondingly, the registered ONU passes the uplink.
  • the new ONU in the PON system also needs to register at the OLT through the uplink channel, during the registration period of the newly added ONU (usually 200 to 250 us), the registered ONUs need to stop sending uplinks on the uplink channel.
  • the service data is used to avoid conflicts between the registration response message sent by the newly added ONU and the uplink service data sent by the registered ONU.
  • the above anti-collision mechanism can have Effectively avoids conflicts between uplink service data and registration response packets, but increases the delay of uplink service data, resulting in the inability of existing PON systems to satisfy high-definition video (4K, 8K video) services and Augmented Reality (AR) services. Delay requirements for low-latency services such as Virtual Reality (VR) or Mobile Fronthual services.
  • the PON system includes one downlink channel and two uplink channels, and one of the two uplink channels has a registration function enabled, and the other has a registration function disabled.
  • the ONU that is not registered in the PON system uses the uplink channel of the registration function to register and activate.
  • the registered ONU can use the uplink channel that closes the registration function to send uplink service data. That is, the OLT can receive the uplink service data and registrations sent by the ONU at the same time.
  • the response packet is processed to avoid the impact of ONU registration activation on uplink service data transmission.
  • FIG. 1 is a system architecture diagram of a PON system according to an embodiment of the present application.
  • the PON system includes an OLT 110 and at least one ONU 120.
  • the OLT 110 and each ONU 120 are connected by an ODN 130.
  • the OLT 110 is a central office device in the PON system and has functions such as ONU registration, bandwidth allocation, and downlink data transmission.
  • the OLT 110 is provided with a downlink transmitter, a first uplink burst receiver, and a second uplink burst receiver.
  • the OLT 110 uses the downlink transmitter (through the downlink channel in the ODN 130) to send downlink data to the ONU 120, and uses the first uplink burst receiver and the second uplink burst receiver to receive the uplink data sent by the ONU 120 burst.
  • the ODN 130 is used to provide an optical transmission channel between the OLT 110 and each of the ONUs 120.
  • the ODN 130 is composed of an optical fiber 131 and a power divider 132.
  • the PON system includes a downlink channel, a first uplink channel, and a second uplink channel, and the downlink channel, the first uplink channel, and the second uplink channel serve as logical channels on the ODN 130, and adopts a wavelength division multiplexing manner. Share ODN130. Meanwhile, in order to avoid mutual influence between the channels, the wavelength of the downstream channel is ⁇ 1 , the wavelength of the first upstream channel is ⁇ 2 , and the wavelength of the second upstream channel is ⁇ 3 , where ⁇ 2 ⁇ 3 .
  • the ONU 120 is a client device in the PON system and has functions such as a registration response, a bandwidth allocation request, and downlink data reception.
  • each of the ONUs 120 is provided with a downlink receiver, a first uplink burst transmitter, and a second uplink burst transmitter.
  • the ONU 120 utilizes the downlink receiver from The downlink channel receives the downlink data sent by the OLT 110, and uses the first uplink burst transmitter to send uplink data on the first uplink channel, and the second uplink burst transmitter to send uplink data on the second uplink channel.
  • the PON system shown in FIG. 1 may be an EPON system or a GPON system, which is not limited in this embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an OLT provided by an embodiment of the present application. This embodiment is described by taking the OLT for the PON system shown in FIG. 1 as an example.
  • the OLT includes: at least one DBA scheduling module 210, a downlink TC module 220, an uplink TC module 230, a downlink transmitter 240, a first uplink burst receiver 241, and a second uplink burst receiver 242.
  • the DBA scheduling module 210 has a control scheduling function for generating an uplink bandwidth grant, and uses the uplink bandwidth grant to control each ONU to send uplink data through the first and second uplink channels. Specifically, the first uplink bandwidth authorization generated by the DBA scheduling module 210 is used to control the ONU to send uplink data through the first uplink channel, and the second uplink bandwidth authorization generated by the DBA scheduling module 210 is used to control the ONU to send uplink data through the second uplink channel. .
  • messages for carrying the uplink bandwidth grant generated by the DBA scheduling module 210 are also different.
  • the message used to carry the uplink bandwidth grant is a BWmap message; when the OLT is used in the EPON system, the message used to carry the uplink bandwidth grant is a Gate message.
  • This embodiment of the present application does not limit the specific type of the message carrying the upstream bandwidth grant.
  • the downlink TC module 220 is connected to each DBA scheduling module 210, and is configured to obtain an uplink bandwidth grant generated by each DBA scheduling module 210, and generate downlink data including the uplink bandwidth grant by using downlink frame aggregation.
  • the downlink data further includes downlink service data that the ONU requests to obtain, such as video data, voice data, and the like that the ONU requests to acquire.
  • the downlink data is generated, where the upper layer service adaptation includes User data adaptation, Optical Network Unit Management and Control Interface (OMCI) adaptation, and the like.
  • GEM GPON encapsulation mode
  • OMCI Optical Network Unit Management and Control Interface
  • the uplink bandwidth authorization corresponding to the first uplink channel and the second uplink channel are sent to the ONU through the same downlink channel.
  • the ONU needs to further determine the uplink corresponding to the uplink bandwidth authorization.
  • Channel thereby authorizing the phase based on the identified upstream bandwidth
  • the uplink data transmission is performed on the uplink channel. Therefore, the uplink bandwidth identifier includes the uplink channel identifier, so that the ONU can identify the received uplink bandwidth authorization according to the uplink channel identifier.
  • the downlink transmitter 240 is connected to the downlink TC module 220, and is configured to send downlink data generated by the downlink TC module 220 to each ONU through the downlink channel.
  • the downlink transmitter 240 transmits downlink data to each ONU in the PON system in a broadcast manner, and the downlink data is transmitted in the downlink channel in the form of an optical carrier signal.
  • the OLT can complete the downlink data transmission by using the DBA scheduling module 210, the downlink TC module 220, and the downlink transmitter 240.
  • the ONU that receives the downlink data passes the first uplink channel or the second uplink channel according to the uplink bandwidth authorization included in the downlink data. Perform uplink data transmission.
  • the ONU sends uplink data through the uplink channel, including the following:
  • the registration response message is sent through the second uplink channel.
  • the uplink service data is sent through the first uplink channel (the uplink service data of the low-latency service and the high-latency service are all sent in the first uplink channel);
  • the uplink service data of the low-latency service is sent through the first uplink channel, and the uplink service data of the high-latency service is sent through the second uplink channel;
  • the uplink service data of the low-latency service is sent only through the first uplink channel.
  • the uplink TC module 230 in the OLT is connected to the first uplink burst receiver 251 and the second uplink burst receiver 252, respectively, so that the first uplink burst receiver 251 receives the ONU on the first uplink.
  • the uplink data transmitted on the channel receives the uplink data transmitted by the ONU on the second uplink channel through the second uplink burst receiver 252.
  • the uplink data is transmitted on the first uplink channel and the second uplink channel in the form of an optical carrier signal.
  • the first uplink channel closes the registration function
  • the second uplink channel starts the registration function
  • the opening and closing of the first uplink channel and the second uplink channel registration function are controlled by the DBA scheduling module 210.
  • the unregistered ONU in the PON system can only send the registration response packet through the second uplink channel.
  • the OLT can only pass the second.
  • the uplink burst receiver 262 receives the registration response message from the second uplink channel, and registers the unregistered ONU according to the registration response message.
  • the unregistered ONU in the PON system sends a note to the OLT through the second uplink channel.
  • the registered ONUs in the system can still send uplink service data to the OLT through the first uplink channel, and there is no conflict between the uplink service data and the registration response message in different uplink channels.
  • the ONU can transmit the uplink service data corresponding to the low-latency service (the service with higher delay requirement) through the first uplink channel, and transmit the registration response message and/or the high-delay service through the second uplink channel.
  • the uplink service data corresponding to the service with lower latency requirements so as to ensure that the system meets the delay requirement of the low-latency service on the premise of ensuring the normal registration of the unregistered ONU.
  • a combiner/demultiplexer 260 is also provided for aggregating or separating optical carrier signals in the uplink and downlink channels.
  • two DBA scheduling modules are disposed in the OLT, and the OLT controls uplink data transmission of the first uplink channel and the second uplink channel by using two DBA scheduling modules.
  • the OLT includes a first DBA scheduling module 211, a second DBA scheduling module 212, and a multiplexing module 270.
  • the first DBA scheduling module 211 is configured to generate a first uplink bandwidth grant, where the first uplink bandwidth grant is used to control uplink data transmission on the first uplink channel, and the second DBA scheduling module 212 is configured to generate a second uplink bandwidth grant.
  • the second uplink bandwidth grant is used to control uplink data transmission on the second uplink channel.
  • the first DBA scheduling module 211 is connected to the second DBA scheduling module 212.
  • the first DBA scheduling module 211 and the second The DBA scheduling module 212 performs information exchange through the connection, thereby implementing scheduling optimization of the uplink bandwidth, which is not limited in this embodiment of the present application.
  • the multiplexing module 270 is connected to the first DBA scheduling module 211 and the second scheduling module 212, respectively, for acquiring the first uplink bandwidth authorization and the second uplink bandwidth authorization, and multiplexing the uplink bandwidth authorization, and finally generating the multiplexing. Upstream bandwidth authorization.
  • the first and second uplink bandwidth grants are multiplexed and sent to the ONU through the same downlink channel.
  • the module 270 needs to add a corresponding uplink channel identifier for the uplink bandwidth authorization, and then add an uplink channel identifier.
  • the identified upstream bandwidth grants are multiplexed.
  • the uplink channel identifier may also be generated by the DBA scheduling module, that is, the DBA scheduling module directly generates an uplink bandwidth authorization that carries the identifier of the uplink channel, which is not limited in this embodiment.
  • the multiplexing module 270 is respectively generated in a first BWmap message (generated by the first DBA scheduling module) and a second BWmap message (generated by the second DBA scheduling module). Add an upstream channel identifier.
  • the multiplexing module 270 can utilize the start time field and the highest bit of the GrantSize field. Or 2bit identifies the upstream channel corresponding to the BWmap message. For example, when the highest 1 bit is 0, it indicates that the BWmap message corresponds to the first uplink channel, and when the highest 1 bit is 1, it indicates that the BWmap message corresponds to the second uplink channel; or when the highest 2 bit is 00, it indicates that the BWmap message corresponds to The first uplink channel, when the highest 2 bit is 11, indicates that the BWmap corresponds to the second uplink channel.
  • the multiplexing module (or the DBA scheduling module) adds a channel identifier field in the Gate message to indicate an uplink channel corresponding to the Gate message.
  • the channel identifier field CH_Num is added to the Gate message.
  • the CH_Num is 0x00
  • the Gate message corresponds to the first uplink channel.
  • the CH_Num is 0x01
  • the Gate message corresponds to the second uplink channel.
  • an operation code may be used to identify an uplink channel corresponding to the Gate message. For example, when the operation code of the Gate message is 0xaa, it indicates that the Gate message corresponds to the first uplink channel, and when the operation code of the Gate message is 0xbb, it indicates that the Gate message corresponds to the second uplink channel.
  • the multiplexing module 270 After performing the uplink channel identification on the first uplink bandwidth authorization and the second uplink bandwidth authorization, the multiplexing module 270 performs aggregation multiplexing on the first uplink bandwidth authorization and the second uplink bandwidth authorization, so as to obtain the multiplexed uplink bandwidth authorization.
  • the multiplexing module 270 is further connected to the downlink TC module 220 for providing the multiplexed uplink bandwidth grant to the downlink TC module 220, and the downlink TC module 220 transmits the downlink data including the uplink bandwidth grant on the downlink channel by using the downlink transmitter 240. .
  • the multiplexing module 270 is further connected to the uplink TC module 230, and is configured to provide the multiplexed uplink bandwidth grant to the uplink TC module 230. Accordingly, the uplink TC module 230 controls the first uplink burst according to the uplink bandwidth grant.
  • the receiver 251 receives the number of uplinks transmitted by the ONU on the first uplink channel. According to the second uplink burst receiver 252, the uplink data transmitted by the ONU on the second uplink channel is received.
  • the OLT further includes a memory 280, wherein the memory 280 is respectively connected to each DBA scheduling module, and the memory 280 is further connected to the multiplexing module 270 and the uplink TC module 230, respectively.
  • the memory 280 copies the uplink bandwidth authorization into two copies, and one copy is sent to the multiplexing module 270, and the multiplexing module 270 multiplexes the uplink bandwidth authorization.
  • the downlink TC module 220 generates downlink data including the uplink bandwidth grant by using the downlink framing aggregation, and finally sends the downlink data to the ONU; the other is stored and sent to the uplink TC module 230, and the uplink TC module 230 Controlling, by the uplink bandwidth grant, the first uplink burst receiver 251 to receive uplink data that is sent by the ONU on the first uplink channel, and controlling the second uplink burst receiver 252 to receive the burst transmission of the ONU on the second uplink channel. Upstream data.
  • the uplink TC module 230 resets the first uplink burst receiver 251 and the second uplink burst transmitter 252 respectively before the uplink data arrives, so as to indicate the first uplink burst receiver.
  • the 251 starts to receive the uplink data that is transmitted by the ONU on the first uplink channel, and indicates that the second uplink burst receiver 252 starts to receive the uplink data that the ONU transmits on the second uplink channel.
  • the uplink TC module 230 may further identify an ONU that transmits uplink data on the first uplink channel and an ONU that transmits uplink data on the second uplink channel according to the uplink bandwidth authorization, so as to further forward the uplink data.
  • the uplink TC module 230 can also perform authentication on the uplink data sent by the ONU according to the uplink bandwidth authorization, so as to determine whether there is an illegally accessed ONU in the PON system. For example, if the uplink TC module 230 detects the uplink data in the uplink transmission time slot indicated by the uplink bandwidth grant, it determines that there is an illegally accessed ONU in the PON system; for example, after receiving the uplink data, the uplink TC module 230 is configured according to The sender (the ONU that sends the uplink data) sends the uplink transmission time slot of the uplink data, and searches for the corresponding ONU identifier in the uplink bandwidth grant.
  • the sender the ONU that sends the uplink data
  • the found ONU identifier is inconsistent with the sender's ONU identifier, it is determined that the PON system is illegal.
  • the accessed ONU where the ONU identifies the LLID or ONU ID assigned to the OLT.
  • the OLT directly filters the uplink data.
  • the OLT further performs the uplink number. According to the analysis, the business information contained in the uplink data is obtained.
  • the multiplexing module 270 may also be connected to the first DBA scheduling module 211 and the second DBA scheduling module 212, respectively, and provide the multiplexed uplink bandwidth authorization to the connected memory 280, where the memory 280 respectively.
  • the multiplexed uplink bandwidth grant is provided to the connected downlink TC module 220 and the uplink TC module 230.
  • the embodiment of the present application does not limit the connection order of the multiplexing module and the memory.
  • the uplink TC module is used to provide an uplink bandwidth grant, so that the uplink TC module can control the uplink burst receiver to receive uplink data according to the uplink bandwidth grant, thereby improving the accuracy of uplink data reception.
  • the uplink TC module is The uplink bandwidth grant can also be used to authenticate the received uplink data, thereby preventing the illegally accessed ONU from affecting the PON system.
  • the OLT when the first DBA scheduling module 211 is configured to disable the registration function, and the second DBA scheduling module 212 is configured to enable the registration function, the newly added ONU can only be in the second DBA scheduling module 212. Registration is performed on the corresponding second uplink channel.
  • the OLT further includes a control module 290.
  • the control module 290 is connected to the first DBA scheduling module 211 and the second DBA scheduling module 212, and is configured to control a DBA scheduling module of the first DBA scheduling module 211 and the second DBA scheduling module 212 to open the registration function, thereby controlling the corresponding The opening and closing of the registration function on the upstream channel.
  • control module 290 configures the opening and closing of the registration functions of the first DBA scheduling module 211 and the second DBA scheduling module 212 according to the received configuration command.
  • the configuration command is input by an external device connected to the OLT.
  • the control module 290 obtains channel transmission quality of the first uplink channel and the second uplink channel every predetermined time interval, and when the channel transmission quality of the first uplink channel is better than the channel transmission quality of the second uplink channel, the control A DBA scheduling module 211 disables the registration function, and controls the second DBA scheduling module 212 to enable the registration function.
  • the first DBA scheduling module 211 is controlled to close the registration.
  • the function controls the second DBA scheduling module 212 to enable the registration function.
  • the control module 290 controls the first DBA scheduling module 211 to disable the registration function
  • the second DBA scheduling module 212 controls the registration function to be used as an example.
  • the first uplink bandwidth grant generated by the first DBA scheduling module that closes the registration function includes an uplink transmission time slot, and the registered ONU in the PON system sends uplink service data on the first uplink channel according to the uplink transmission time slot;
  • the second uplink band generated by the second DBA scheduling module of the function The wide-license includes a registration time slot, and the unregistered ONU in the PON system sends a registration response message on the second uplink channel according to the registration time slot, and finally the OLT completes registration activation according to the registration response message.
  • the first uplink channel of the OLT configured in FIG. 3 is only used to transmit uplink service data
  • the second uplink channel is configured to transmit only the registration response packet, that is, all uplink service data in the PON system passes the first uplink.
  • Channel transmission, all registration response messages in the system are transmitted through the second uplink channel.
  • the first DBA scheduling module 211 is configured to generate a first uplink bandwidth grant including an uplink sending time slot.
  • the uplink transmission time slot is used to indicate that the registered ONUs in the PON system send uplink service data through the first uplink channel, and the uplink transmission time slots corresponding to different ONUs are different.
  • the uplink transmission time slot refer to the GPON series standard and/or the EPON series standard, which is not limited in this embodiment of the present application.
  • the first uplink bandwidth grant includes a correspondence between the ONU identifier and the uplink sending time slot, and the ONU searches for the corresponding uplink sending time slot according to the self-ONU identifier, and is indicated by the uplink sending time slot.
  • the uplink service data is sent in bursts during the period.
  • the second DBA scheduling module 212 is configured to generate a second uplink bandwidth grant that includes a registration slot.
  • the registration time slot is used to indicate that the unregistered ONU in the PON system sends a registration response message on the second uplink channel.
  • the unregistered ONU receives the second uplink bandwidth grant through the downlink channel, and detects that the second uplink bandwidth grant includes the registration slot, that is, sends the registration response packet in the period indicated by the registration slot.
  • the unregistered ONU sends a registration response message through the second uplink channel, and the registered ONU sends the uplink service data through the first uplink channel, and the two do not conflict with each other;
  • the registered ONU sends the uplink service data through the first uplink channel, and the second uplink channel is in the closed state.
  • the second uplink burst receiver of the OLT and the second uplink of the ONU The transmitters all stop working, thus realizing the dynamic energy saving of the PON system.
  • the OLT configured with the first uplink channel is used to transmit the first uplink service data
  • the second uplink channel is configured to transmit the registration response packet and the second uplink service data
  • the first DBA scheduling module 211 is configured to generate a first uplink bandwidth grant that includes the first uplink sending time slot.
  • the second DBA scheduling module 212 is configured to generate a second uplink bandwidth grant including the second uplink sending time slot and the registration time slot.
  • the first uplink sending time slot is used to indicate that the registered ONU sends the first uplink service data on the first uplink channel
  • the second uplink sending time slot is used to indicate that the registered ONU sends the second uplink channel on the second uplink channel.
  • the uplink service data, the registration time slot is used to indicate that the unregistered ONU sends the registration response message on the second uplink channel
  • the delay requirement of the first uplink service data is higher than the delay requirement of the second uplink service data.
  • the delay of the first uplink service data is lower than the delay of the second uplink service data, that is, the ONU sends the uplink service data corresponding to the low-latency service through the first uplink channel, and adds the ONU through the second uplink channel.
  • the ONU sends the uplink service data corresponding to the low-latency service through the first uplink channel, and adds the ONU through the second uplink channel.
  • the unregistered ONU when the unregistered ONU sends the registration response packet according to the registration time slot in the second uplink bandwidth authorization, the registered ONU needs to stop sending the second uplink service data on the second uplink channel, avoiding the second.
  • the uplink service data and the registration response message generate a collision on the second uplink channel.
  • the PON system can use the dual uplink channel to perform uplink service data transmission, thereby improving the transmission rate of the uplink service data in the entire PON system.
  • two DBA scheduling modules are disposed in the OLT as an example.
  • only one DBA scheduling module may be configured in the OLT, and the OLT controls the first through the DBA scheduling module.
  • the OLT includes a DBA scheduling module 210 and a control module 290.
  • the control module 290 is connected to the DBA scheduling module 210 for controlling the DBA scheduling module 210 to enable or disable the registration function.
  • control module 290 controls the DBA scheduling module 210 to open the registration function every predetermined time interval, and controls the DBA scheduling module 210 to close the registration function when the registration function is enabled for a preset duration.
  • the DBA scheduling module 210 When the registration function is enabled, the DBA scheduling module 210 generates a first uplink bandwidth grant including a first uplink transmission slot and a second uplink bandwidth grant including a registration slot.
  • each ONU in the PON system receives the first uplink bandwidth grant and the second uplink bandwidth.
  • the registered ONU sends the first uplink service data through the first uplink channel according to the first uplink transmission time slot included in the first uplink bandwidth authorization; the unregistered ONU is included in the second uplink bandwidth authorization.
  • Registering a time slot sending a registration response message through the second uplink channel and completing the registration activation.
  • the DBA scheduling module 210 When the registration function is disabled, and the second uplink channel is configured to transmit only the registration response message, the DBA scheduling module 210 generates a first uplink bandwidth grant including the first uplink transmission time slot, indicating that the registered ONU in the system passes the first The uplink channel sends uplink service data.
  • the DBA scheduling module 210 When the registration function is disabled, and the second uplink channel is configured to transmit the registration response message and the second uplink service data, the DBA scheduling module 210 generates a first uplink bandwidth grant including the first uplink transmission time slot and includes the second uplink transmission.
  • the second uplink bandwidth of the time slot indicates that the registered ONU sends the first uplink service data through the first uplink channel, and sends the second uplink service data through the second uplink channel.
  • the OLT further includes a memory 280, wherein the memory 280 is connected to the DBA scheduling module 210, and the memory 280 is further connected to the downlink TC module 220 and the uplink TC module 230, respectively.
  • the memory 280 copies the uplink bandwidth authorization into two copies, one of which is sent to the downlink TC module 220, and the downlink TC module 220 generates the uplink bandwidth authorization by using the downlink framing aggregation.
  • the uplink data sent by the burst on the first uplink channel controls the second uplink burst receiver 252 to receive the uplink data that is sent by the ONU on the second uplink channel.
  • the uplink TC module 230 resets the first uplink burst receiver 251 and the second uplink burst transmitter 252 respectively before the uplink data arrives, so as to indicate the first uplink burst receiver.
  • the 251 starts to receive the uplink data that is transmitted by the ONU on the first uplink channel, and indicates that the second uplink burst receiver 252 starts to receive the uplink data that the ONU transmits on the second uplink channel.
  • the uplink TC module 230 may further identify, according to the uplink bandwidth authorization, an ONU that transmits uplink data on the first uplink channel and an ONU that transmits uplink data on the second uplink channel, so that Implement further forwarding of upstream data.
  • the uplink TC module 230 can also perform authentication on the uplink data sent by the ONU according to the uplink bandwidth authorization, so as to determine whether there is an illegally accessed ONU in the PON system. For example, if the uplink TC module 230 detects the uplink data in the uplink transmission time slot indicated by the uplink bandwidth grant, it determines that there is an illegally accessed ONU in the PON system; for example, after receiving the uplink data, the uplink TC module 230 is configured according to The sender (the ONU that sends the uplink data) sends the uplink transmission time slot of the uplink data, and searches for the corresponding ONU identifier in the uplink bandwidth grant.
  • the sender the ONU that sends the uplink data
  • the found ONU identifier is inconsistent with the sender's ONU identifier, it is determined that the PON system is illegal.
  • the accessed ONU where the ONU identifies the LLID or ONU ID assigned to the OLT.
  • the OLT directly filters the uplink data that has not passed the authentication.
  • the OLT further analyzes the uplink data to obtain the service information included in the uplink data.
  • the uplink TC module is used to provide an uplink bandwidth grant, so that the uplink TC module can control the uplink burst receiver to receive uplink data according to the uplink bandwidth grant, thereby improving the accuracy of uplink data reception.
  • the uplink TC module is The uplink bandwidth grant can also be used to authenticate the received uplink data, thereby preventing the illegally accessed ONU from affecting the PON system.
  • FIG. 5 is a schematic structural diagram of an ONU provided by an embodiment of the present application.
  • This embodiment uses the ONU as the PON system shown in FIG. 1 as an example for description.
  • the ONU includes a downlink TC module 510, at least one DBA response module 520, an uplink TC module 530, a downlink receiver 540, a first uplink burst transmitter 551, and a second uplink burst transmitter 552.
  • the downlink receiver 540 is configured to receive downlink data sent by the OLT (in broadcast form) on the downlink channel, where the downlink data is transmitted in the downlink channel in the form of an optical carrier signal.
  • the downlink data includes an uplink bandwidth grant for controlling the ONU to send uplink data.
  • the OLT sends the BWmap message to carry the uplink bandwidth grant; when the ONU is used in the EPON system, the Gate message sent by the OLT carries the uplink bandwidth grant.
  • the downlink data further includes downlink service data that is requested by the ONU, such as video data, voice data, and the like that are requested by the ONU.
  • downlink service data such as video data, voice data, and the like that are requested by the ONU.
  • the downlink receiver 540 After receiving the downlink data, the downlink receiver 540 provides the downlink data to the connected downlink TC module 510.
  • the downlink TC module 510 restores the uplink bandwidth grant and the downlink service data included in the downlink data, and provides the downlink terminal device with the downlink data.
  • the service data is lined and the identified upstream bandwidth grant is provided to the connected DBA response module 520.
  • the DBA response module 520 corresponds to the DBA scheduling module of the OLT in the foregoing embodiment, and is configured to control the ONU to send uplink data through the uplink channel according to the obtained uplink bandwidth authorization.
  • the DBA response module 520 is further connected to the uplink TC module 530, and is configured to control the uplink TC module 530 to send uplink data according to the uplink bandwidth authorization included in the downlink data.
  • the ONU sends uplink data to the OLT through two uplink channels.
  • the ONU sends uplink data to the OLT through two uplink channels.
  • the downlink data includes a first uplink bandwidth authorization and a second uplink bandwidth authorization
  • the DBA response module 520 controls the uplink TC module 530 to send uplink data by using the first uplink channel according to the first uplink bandwidth authorization, according to the second uplink bandwidth.
  • the authorization control uplink TC module 530 transmits uplink data through the second uplink channel.
  • the uplink TC module 530 is further configured to receive an uplink bandwidth request sent by each DBA response module 520, and perform an uplink bandwidth request report by using an uplink channel corresponding to the DBA response module 520, where the uplink bandwidth request is a DBA response module 520. Obtained after collecting statistics on the data packets in the send queue.
  • the uplink TC module 530 is respectively connected to the first uplink burst transmitter 551 and the second uplink burst transmitter 552, thereby transmitting on the first uplink channel by using the first uplink burst transmitter 551.
  • the uplink data is sent by the second uplink burst transmitter 552 on the second uplink channel.
  • the first uplink burst transmitter 551 corresponding to the first uplink channel sends an enable signal to trigger the first uplink burst transmitter 551.
  • Sending the uplink data when the uplink TC module 530 needs to send the uplink data through the second uplink channel, that is, sending an enable signal to the second uplink burst transmitter 552 corresponding to the second uplink channel, triggering the second uplink burst transmitter 552 Send upstream data.
  • the first uplink channel closes the registration function
  • the second uplink channel starts the registration function
  • the opening and closing of the first uplink channel and the second uplink channel registration function are controlled by the OLT.
  • the uplink channel of the registration function can be used to transmit the registration service packet, and the uplink channel does not have any conflicts. Therefore, the ONU selects the first uplink channel of the registration function to transmit the uplink service data. Selecting the second uplink channel of the registration function to transmit the registration response message; or, according to the delay requirement of the service, the ONU selects the first uplink channel that closes the registration function to transmit the low-latency service (for the service with higher delay requirement) Upstream business data, choose to open the note The second uplink channel of the book function transmits the registration response message and the uplink service data corresponding to the high-latency service (the service with lower delay requirement).
  • the second uplink channel registration function is configured, so that the unregistered ONU in the PON system is registered when sending the registration response message through the second uplink channel.
  • the ONU can still send the uplink service data through the first uplink channel, thereby avoiding the impact of the ONU registration on the uplink data transmission of the service, thereby satisfying the requirement of the system delay for the low-latency service.
  • the ONU A combiner/demultiplexer 560 is also provided for aggregating or separating optical carrier signals in the uplink and downlink channels.
  • the uplink bandwidth authorization sent by the OLT through the downlink channel is obtained by using the first uplink bandwidth authorization and the second uplink bandwidth authorization multiplexing, and correspondingly, after receiving the uplink bandwidth authorization, the ONU needs to perform the uplink.
  • the bandwidth grant is demultiplexed, so that the uplink data is sent on the corresponding uplink channel according to the first uplink bandwidth grant and the second uplink bandwidth grant obtained by the demultiplexing.
  • the ONU includes a first DBA response module 521, a second DBA response module 522, and a demultiplexing module 570.
  • the demultiplexing module 570 is configured to obtain the uplink bandwidth grant received by the downlink TC module 510, and demultiplex the uplink bandwidth grant, thereby obtaining the first uplink bandwidth grant, corresponding to the multiplexing module of the OLT in the foregoing embodiment. And a second upstream bandwidth grant.
  • the demultiplexing module 570 is further connected to the first DBA response module 521 and the second DBA response module 522, and is configured to provide the first DBA response module 521 with the first uplink bandwidth grant obtained by demultiplexing, to the second The DBA response module 522 provides a second upstream bandwidth grant obtained by demultiplexing.
  • the demultiplexing module 570 demultiplexes the first uplink bandwidth grant and the second uplink bandwidth grant according to the uplink channel identifier included in the (upper multiplexed) uplink bandwidth grant, where the first uplink bandwidth grant and the first uplink bandwidth grant
  • the uplink channel identifier of the uplink channel corresponds to the uplink channel identifier of the second uplink channel.
  • the demultiplexing module 670 sends the first and second uplink bandwidth grants to the corresponding DBA response module.
  • the first DBA response module 521 is connected to the demultiplexing module 570, and is configured to control the uplink TC module 530 to send uplink data by using the first uplink channel according to the first uplink bandwidth authorization.
  • the second DBA response module 522 is connected to the demultiplexing module 570, and is configured to control the uplink TC module 530 to send uplink data through the second uplink channel according to the second uplink bandwidth grant.
  • the first uplink channel that closes the registration function is only used to transmit uplink service data
  • the second uplink channel that starts the registration function is only used to transmit the registration response message
  • the uplink TC module 530 in the ONU sends a first enable signal to the first uplink burst transmitter 551 according to the uplink sending time slot in the first uplink bandwidth grant, triggering the first An uplink burst transmitter 551 sends uplink service data to the OLT through the first uplink channel;
  • the uplink TC module 530 in the ONU sends a second enable signal to the second uplink burst transmitter 552 according to the registration time slot in the second uplink bandwidth grant, triggering the second
  • the uplink burst transmitter 552 sends a registration response message to the OLT through the second uplink channel.
  • the registered ONUs in the PON system pass the first An uplink channel sends uplink service data to the OLT, and the unregistered ONU sends a registration response message to the OLT through the second uplink channel, and the uplink service data and the registration response message are transmitted on different uplink channels, thereby avoiding the ONU registration process to the uplink service.
  • the data transmission process has an impact.
  • the first uplink channel that closes the registration function is used to transmit the first uplink service data
  • the second uplink channel that is used to enable the registration function is used to transmit the registration response message and the second uplink service data.
  • the uplink TC module 530 in the ONU sends a third enable signal to the first uplink burst transmitter 551 according to the first uplink transmission time slot in the first uplink bandwidth grant.
  • the first uplink burst transmitter 551 is configured to send the first uplink service data by using the first uplink channel; at the same time, the uplink TC module 530 is configured to send the second uplink transmission time slot according to the second uplink bandwidth grant to the second uplink.
  • the transmitter 552 sends a fourth enable signal, so that the second uplink burst transmitter 552 sends the second uplink service data through the second uplink channel, where the delay requirement of the first uplink service data is higher than the second uplink service. The latency requirement of the data.
  • the uplink TC module 530 in the ONU sends a second enable signal to the second uplink burst transmitter 552 according to the registration time slot in the second uplink bandwidth grant, thereby triggering the The two uplink burst transmitters 552 send a registration response message through the second uplink channel.
  • the registered ONU needs to stop sending the second uplink service data through the second uplink channel, so as to prevent the registration response message on the second uplink channel from colliding with the second uplink service data.
  • the first uplink channel is used for transmitting uplink service data of the low-latency service
  • the second uplink channel is used for performing ONU registration, and is also used for transmitting uplink service data of the high-latency service, ensuring The ONU registration does not affect the low-latency service, and uses two uplink channels to transmit uplink service data, which further improves the transmission rate of uplink service data in the PON system.
  • the first DBA response module 521 and the second DBA response module 522 are connected to the same uplink TC module 530 as an example.
  • the uplink TC module 530 can be configured. Splitting into two sub-uplink TC modules, and the first DBA response module 521 and the second DBA response module 522 are connected to the corresponding sub-uplink TC modules, and the uplink data is sent by the sub-uplink TC module, which is not in this embodiment. Limited.
  • the following two DBA response modules are included in the ONU as an example.
  • the ONU includes a DBA response.
  • Module 520 and channel selection module 580 are included in the ONU as an example.
  • the DBA response module 520 is connected to the downlink TC module 510, and is configured to control the uplink TC module 530 to send uplink service data according to the received first uplink bandwidth authorization, or control the uplink TC module 530 to send a registration response according to the received second uplink bandwidth authorization. Message.
  • One end of the channel selection module 580 is connected to the uplink TC module 530, and the other end of the channel selection module 580 is connected to the first uplink burst transmitter 551 and the second uplink burst transmitter 552, respectively.
  • the channel selection module 580 After obtaining the uplink data (uplink service data or registration response message) to be sent by the uplink TC module 630, the channel selection module 580 further determines, according to the registration status of the ONU, which uplink burst transmitter is used for uplink data transmission.
  • the channel selection module 580 selects the first uplink burst transmitter 551 to send the uplink traffic data of the uplink convergence of the uplink TC module 530; when the ONU is in the unregistered state, the channel selection module 580 selects the second uplink.
  • the burst transmitter 552 transmits the registration response message generated by the uplink TC module 530.
  • the channel selection module in the ONU turns off the second uplink burst transmitter (ie, turns off its second uplink channel) according to the registration state of the ONU, and turns on the second uplink channel when the ONU is in the registered state.
  • the first uplink burst transmitter sends uplink service data on the first uplink channel; when the ONU is in the unregistered state, the first uplink burst transmitter is turned off (ie, the first uplink of the uplink is closed) Channel), and by sending a second uplink burst transmitter to send a registration response message on the second uplink channel, realizing dynamic energy saving of the ONU.
  • the ONU When the ONU needs to send the low-latency service and the uplink service data of the high-latency service at the same time, in order to avoid the impact of the ONU registration on the low-latency service, the ONU needs to separate the low-latency service data uplink process and the ONU registration process.
  • the ONU further includes a service classification module 590.
  • the service classification module 590 classifies the upper layer service according to the preset classification standard, and divides the upper layer service into the first category and the second category, wherein the delay requirement of the service belonging to the first category is higher than that of the service belonging to the second category. Delay demand.
  • the service classification module 590 is configured to collect delay requirements of each service, and determine a service classification to which each service belongs according to the delay requirement.
  • the service classification module 590 selects the corresponding DBA response module (corresponding to the uplink channel) to send the uplink service data corresponding to the service according to the service classification to which the service belongs.
  • the high-delay service is insensitive to the delay, that is, the ONU registration does not affect the high-latency service. Therefore, when the service classification indicates that the service belongs to the first category (that is, the service is a low-latency service), the service classification module 590 stores the service.
  • the first DBA response module 521 is processed by the first DBA response module 521, and the first DBA response module 521 controls the uplink TC module 530 to send the first uplink service data corresponding to the service by closing the first uplink channel of the registration function;
  • the service classification module 590 passes the service to the second DBA response module 522, and the second DBA response module 522 controls the uplink TC module 530 to send the second uplink channel by enabling the registration function.
  • the ONU may further sort the services according to the priority of the service, and preferentially send the uplink data corresponding to the high priority service, which is not limited in this embodiment.
  • the ONU classifies the service by using the service classification module, and selects the first uplink channel that closes the registration function to send the uplink data corresponding to the low-latency service, and selects the second uplink channel that starts the registration function to send the uplink corresponding to the high-latency service.
  • Data ensures that low-latency services are not affected by ONU registration and meet the system latency requirements of low-latency services.
  • the first uplink burst transmitter 551 and the second uplink burst burst The shooter 552 is fixed in the ONU, but in actual use, the second uplink burst transmitter 552 only works when registering or when the second uplink service data needs to be sent, resulting in the second uplink burst transmitter.
  • the utilization rate of 552 is low.
  • the ONU includes an optical module slot 910, and the optical module slot 910 is used for inserting An optical module 911 or a second optical module 912.
  • the first optical module 911 includes at least a downlink receiver 540 and a first uplink burst transmitter 551, and the second optical module 912 includes at least a downlink receiver 540 and a second uplink burst receiver 551;
  • the first optical module 911 receives the downlink data on the downlink channel through the downlink receiver 540, and sends the uplink data on the first uplink channel by using the first uplink burst transmitter 551;
  • the second optical module 912 When the second optical module 912 is inserted into the optical module slot 910, the second optical module 912 receives the downlink data through the downlink channel, and sends the uplink data on the second uplink channel through the second uplink burst transmitter 552.
  • the first uplink channel is closed, and the second uplink channel is enabled to be registered. Therefore, for the unregistered ONU in the PON system, the second optical module 912 is inserted into the optical module slot 910, so that the unregistered ONU passes the downlink.
  • the channel After receiving the downlink data including the registration time slot, the channel can send a registration response message to the OLT through the second uplink burst transmitter 552 in the second optical module 912, thereby completing the registration activation; when the ONU completes the registration, the first The second optical module 912 is removed, and the first optical module 911 is inserted into the optical module slot 910, so that the registered ONU can pass the downlink data of the uplink sending time slot through the downlink channel, and then can pass through the first optical module 911.
  • the first upstream burst transmitter 551 transmits uplink traffic data to the OLT.
  • the first optical module 911 is inserted into the optical module slot 910, and the ONU may be out of step due to not receiving the downlink data sent by the OLT for a period of time, thereby causing the ONU. Exit from normal working status.
  • the OLT sends the registration information to the ONU through the downlink channel, so that the ONU returns to the normal working state according to the registration information.
  • the installer when installing the ONU, the installer only needs to use the second optical module 920 for ONU registration in the ONU registration phase, and after the ONU is registered, the first optical module 910 is inserted into the ONU to complete the ONU installation; and the installer can Different ONU installations are completed by the same second optical module 920, thereby reducing the manufacturing cost of the ONU.
  • the combiner/demultiplexer 560, the downlink TC module 510, the DBA response module 520, the uplink TC module 530, and the second optical module 912 may also constitute an ONU registration device dedicated for registration, and the ONU The SN or MAC address of the registered device is set to be modifiable.
  • the ONU registration device acquires the SN or MAC address of the newly added ONU, and accesses the PON system.
  • the registration response packet (including the SN or MAC address of the newly added ONU) is sent through the second uplink channel according to the registration time slot included in the downlink data, thereby
  • the ONU registration device completes the registration according to the SN or MAC address of the newly added ONU
  • the ONU registration device is removed, and the newly added ONU is connected to the PON system. Since the ONU registration device has been registered with the SN or MAC address of the newly added ONU, the registration is completed when the new ONU accesses the PON system, and the first uplink burst transmitter in the first optical module 910 can be passed. 551 sends uplink service data.
  • the newly added ONU may still be in the initial state.
  • the OLT sends the registration information to the downstream channel. The ONU, so that the ONU returns to the normal working state according to the registration information.
  • the downlink receiver and the second uplink burst transmitter are integrated into the second optical module, so that different new The ONU can use the same second optical module to complete the ONU registration, thereby improving the utilization rate of the second uplink burst transmitter and reducing the manufacturing cost of the ONU.
  • the second uplink channel is only used for ONU registration, and all uplink service data is transmitted through the first uplink channel.
  • the transmission of the first uplink channel is performed. Excessive pressure will have an impact on low-latency services.
  • the ONU includes the first optical module slot 1011 and the second optical module slot 1012, and the first optical module slot.
  • the bit 1011 is used to insert the first optical module 1021
  • the second optical module slot 1012 is used to insert the second optical module 1022.
  • the first optical module 1021 includes at least a first uplink burst transmitter 551, and the second optical module 1022 includes at least a downlink receiver 540 and a second uplink burst transmitter 552.
  • the ONU can receive the downlink data through the downlink receiver 540 in the second optical module 1022 by inserting the second optical module 1022 into the second optical module slot 1012 and connecting the ONU to the PON system. And registration activation is completed on the second uplink channel according to the registration time slot included in the downlink data.
  • the ONU uses the second uplink channel to complete the registration, and further uses the second uplink channel to send the uplink service data. Due to high The delay service is not sensitive to the delay. Therefore, even if the newly added ONU uses the second uplink channel for device registration, it will not have a significant impact on the registered ONU.
  • the first optical module 1022 When the ONU needs to transmit the uplink service data of the low-latency service, in order to prevent the ONU registration from affecting the low-latency service, the first optical module 1022 needs to be inserted into the first optical module slot 1011. After the first optical module 1022 is inserted into the ONU, the ONU transmits the second uplink service data corresponding to the high-latency service through the second uplink burst transmitter 552 in the second optical module 1022, and passes the first uplink in the first optical module 1021. The burst transmitter 551 transmits the first uplink service data corresponding to the low-latency service, thereby achieving the effect of offloading the uplink service data. At the same time, since the newly added ONU registers through the second uplink channel, the ONU registration does not affect the uplink service data transmission in the first uplink channel.
  • the optical module when the optical module includes both the uplink burst transmitter and the downlink receiver, the optical module also needs to include a combiner/demultiplexer, so as to receive the received
  • the optical carrier signal is aggregated or separated, which is not limited by the embodiment of the present application.
  • FIG. 11 is a flowchart of a data interaction process in a PON system provided by an embodiment of the present application.
  • the PON system includes: an OLT and at least two ONUs, and the OLT is connected to each ONU through an ODN, and the OLT and the at least two ONUs perform data interaction through one downlink channel and two uplink channels in the ODN.
  • Step 1110 The OLT sends downlink data to each ONU through the downlink channel, where the downlink data includes an uplink bandwidth grant, and the uplink bandwidth grant is used to control the ONU to send uplink data.
  • the uplink bandwidth grant is generated by at least one DBA scheduling module in the OLT.
  • the downlink data includes a first uplink bandwidth grant and a second uplink bandwidth grant, where the first uplink bandwidth grant is used to control the ONU to send uplink data on the first uplink channel, and the second uplink bandwidth grant is used to control the ONU.
  • the uplink data is sent on the second uplink channel, and the uplink data sent by the ONU includes uplink service data or a registration response message.
  • the message carrying the uplink bandwidth grant is a BWMAP message; if the PON system is an EPON system, the message carrying the uplink bandwidth grant is a Gate message.
  • step 1120 the ONU receives downlink data through the downlink channel.
  • each ONU in the PON system receives the downlink data sent by the OLT in a broadcast form through the downlink channel.
  • Step 1130 The ONU passes the first uplink pass according to the uplink bandwidth authorization included in the downlink data.
  • the channel or the second uplink channel transmits uplink data.
  • the ONU further obtains the uplink bandwidth authorization included in the downlink data, and sends uplink data to the OLT through the first uplink channel or the second uplink channel according to the registration state of the ONU.
  • the first uplink channel closes the registration function
  • the second uplink channel enables the registration function
  • the registration function is used to register the unregistered ONU.
  • the ONU when the ONU is in the unregistered state, and the acquired uplink bandwidth grant includes the registration time slot, the ONU sends a registration response message to the OLT by using the second uplink channel of the registration function in the registration time slot.
  • the ONU when the ONU is in the registered state, and the obtained uplink bandwidth grant includes the uplink sending time slot, the ONU sends the uplink service data to the OLT by using the first uplink channel that closes the registration function in the uplink sending time slot; Or, the ONU sends the uplink service data to the OLT through the first uplink channel and the second uplink channel in the uplink transmission time slot.
  • the ONU divides the uplink service data transmission and the ONU registration into different uplink channels according to the uplink bandwidth authorization generated by the OLT, thereby avoiding the impact of the ONU registration on the uplink service data transmission, and satisfying the low delay service to the system. The need for delay.
  • the downlink channel, the first uplink channel, and the second uplink channel share the same ODN in a wavelength division multiplexing manner, and the wavelengths of the first uplink channel and the second uplink channel are different, thereby avoiding the first uplink channel and the first uplink channel. Interference occurs between the two upstream channels.
  • Step 1140 The OLT receives uplink data sent by each ONU through the first uplink channel and the second uplink channel.
  • the OLT receives the uplink data sent by each ONU through the first uplink channel and the second uplink channel, where the uplink data includes the registration response message sent by the second uplink channel, and the first and/or second uplink channel is adopted.
  • the OLT parses the uplink service data, and further feeds back the corresponding downlink data to the ONU through the downlink channel; when the OLT receives the unregistered ONU, the OLT sends the uplink data to the ONU.
  • the OLT registers the unregistered ONU.
  • the downlink data sent by the OLT through the downlink channel includes the first uplink bandwidth authorization and the second uplink bandwidth authorization, and after receiving the downlink data, the ONU passes the first uplink channel according to the first uplink bandwidth authorization.
  • the wide grant sends uplink data to the OLT through the second uplink channel, which is described below using an illustrative embodiment.
  • FIG. 12 is a flowchart of a data interaction process in a PON system provided by another embodiment of the present application.
  • step 1201 the OLT generates a first uplink bandwidth grant and a second uplink bandwidth grant.
  • the first uplink channel in the PON system closes the registration function
  • the second uplink channel starts the registration function, that is, the unregistered ONU in the PON system completes the registration activation in the second uplink channel.
  • the first uplink bandwidth authorization generated by the OLT is used to indicate that the registered ONU sends uplink service data through the first uplink channel
  • the second uplink bandwidth authorization generated by the OLT is used to indicate that the unregistered ONU passes the second in the registration period.
  • the uplink channel sends a registration response message, or the second uplink bandwidth authorization is used to indicate that the registered ONU sends the uplink service data through the second uplink channel in the non-registration period.
  • the OLT includes a first DBA scheduling module and a second DBA scheduling module, and generates a first uplink bandwidth authorization by using the first DBA scheduling module, and generates a second uplink bandwidth authorization by using the second DBA scheduling module.
  • the OLT when the first uplink channel is configured to transmit only uplink service data, and the second uplink channel is configured to transmit only the registration response message, the OLT generates an uplink transmission time slot.
  • the first uplink bandwidth grant generates a second uplink bandwidth grant including the registration slot.
  • the first uplink bandwidth authorization is used to indicate that the registered ONU in the PON system passes the first uplink channel, and sends uplink service data in the uplink transmission time slot; the second uplink bandwidth authorization is used to indicate that the PON system is not registered.
  • the ONU sends a registration response message in the registration time slot through the second uplink channel.
  • the OLT when the first uplink channel is configured to transmit the first uplink service data, and the second uplink channel is configured to transmit the registration response message and the second uplink service data, the OLT Generating a first uplink bandwidth grant including a first uplink transmission slot, and generating a second uplink bandwidth grant including the second uplink transmission slot and the registration slot.
  • the first bandwidth authorization is used to indicate that the registered ONU in the PON system passes the first uplink channel, and sends the first uplink service data in the first uplink transmission time slot; the second bandwidth authorization is used to indicate the registered
  • the ONU sends the second uplink service data through the second uplink channel (according to the second uplink transmission time slot) during the non-registration period (ie, the non-quick windowing period), or the second bandwidth authorization is used to indicate that the second bandwidth is not registered.
  • the ONU sends a registration response message through the second uplink channel (according to the registration time slot).
  • the delay requirement of the first uplink service data is higher than the delay requirement of the second uplink service data.
  • the opening and closing of the registration functions of the first uplink channel and the second uplink channel are performed by OLT Ling.
  • the active configuration that is, the OLT can configure the first uplink channel to open the registration function, and configure the second uplink channel to close the registration function; the OLT can also configure the first uplink channel to close the registration function, and configure the second uplink channel to open the registration function.
  • the embodiment of the present application only uses the first uplink channel to close the registration function, and the second uplink channel to open the registration function as an example for illustrative purposes, but is not limited thereto.
  • the OLT acquires channel transmission quality of the first uplink channel and the second uplink channel every predetermined time interval; when the channel transmission quality of the first uplink channel is better than the channel transmission quality of the second uplink channel, the OLT controls the first uplink.
  • the channel close registration function controls the second uplink channel to open the registration function; when the channel transmission quality of the second uplink channel is better than the channel transmission quality of the first uplink channel, the OLT controls the second uplink channel to close the registration function, and controls the first uplink channel. Turn on the registration function.
  • the uplink burst receiver in the OLT performs well before the uplink data arrives.
  • the data receiving preparation the OLT stores the generated first uplink bandwidth grant and the second uplink bandwidth grant, and receives uplink data according to the first uplink bandwidth grant and the second uplink bandwidth grant control response uplink burst receiver.
  • Step 1202 The OLT multiplexes the first uplink bandwidth grant and the second uplink bandwidth grant to obtain the multiplexed uplink bandwidth grant.
  • a multiplexing module is configured in the OLT, and the uplink bandwidth authorization generated by the OLT is multiplexed and aggregated by using the multiplexing module.
  • the first and second uplink bandwidth grants are multiplexed and sent to the ONU through the same downlink channel.
  • the OLT needs to add a corresponding uplink channel identifier to the first and second uplink bandwidth grants, and then re-establish the uplink bandwidth grant after adding the uplink channel identifier. use.
  • the OLT may directly generate the first and second uplink bandwidth authorizations that carry the identifier of the uplink channel, which is not limited in this embodiment.
  • the OLT when the OLT is used in the GPON system, the OLT is in the first BWmap message (that is, the message carrying the first uplink bandwidth grant) and the second BWmap message (that is, the message carrying the second uplink bandwidth grant). Add an upstream channel identifier.
  • the OLT when the OLT is used in the EPON system, the OLT is in the first Gate message (that is, the message carrying the first uplink bandwidth grant) and the second Gate message (that is, the message carrying the second uplink bandwidth grant). Add an upstream channel identifier.
  • Step 1203 The OLT sends downlink data to each ONU through the downlink channel, where the downlink data includes the multiplexed uplink bandwidth grant.
  • the downlink data is generated, and the built-in downlink transmitter is controlled to send the downlink data on the downlink channel.
  • the upper layer service adaptation includes user data adaptation, OMCI adaptation, and the like.
  • step 1204 the ONU receives downlink data through the downlink channel.
  • each ONU in the PON system receives the downlink data sent by the OLT in a broadcast form through the downlink channel.
  • Step 1205 The ONU demultiplexes the received uplink bandwidth grant to obtain a first uplink bandwidth grant and a second uplink bandwidth grant.
  • the ONU After receiving the downlink data, the ONU obtains the multiplexed uplink bandwidth grant included in the downlink data, and demultiplexes the uplink bandwidth grant, thereby obtaining the first uplink bandwidth grant and the second uplink bandwidth grant.
  • the ONU obtains the multiplexed uplink bandwidth grant, and demultiplexes the uplink bandwidth identifier included in the uplink bandwidth grant, so as to obtain the first uplink bandwidth authorization used to control the first uplink channel, and And controlling a second uplink bandwidth authorization of the second uplink channel.
  • Step 1206 The ONU sends uplink data on the first uplink channel according to the first uplink bandwidth grant, and/or sends uplink data on the second uplink channel according to the second uplink bandwidth grant.
  • the registered ONU is based on the uplink included in the first uplink bandwidth authorization.
  • the sending time slot transmits the uplink service data through the first uplink channel.
  • the unregistered ONU sends the registration response message through the second uplink channel according to the registration time slot included in the second uplink bandwidth authorization.
  • the registered ONU when the first uplink channel is used to transmit the first uplink service data, and the second uplink channel is used to transmit the registration response message and the second uplink service data, the registered ONU is according to the The first uplink transmission time slot included in the uplink bandwidth grant sends the first uplink service data through the first uplink channel, and the ONU passes the second uplink transmission time slot included in the second uplink bandwidth grant, and passes the second uplink channel.
  • the second uplink service data is sent; the unregistered ONU sends a registration response message to the OLT through the second uplink channel according to the registration time slot in the second uplink bandwidth authorization, and the registration activation is completed.
  • the registered ONU collects the delay requirements of each upper-layer service before sending the uplink data through the dual uplink channel, and determines each time according to the delay requirement of each service.
  • the service class to which the service belongs when the service class indicates that the service belongs to the first class, the ONU determines to send the uplink data corresponding to the service through the first uplink channel; when the service class indicates that the service belongs to the second class, the ONU determines to pass the second uplink channel. Send the uplink data corresponding to the service.
  • the ONU may further sort the services according to the priority of the service, and preferentially send the uplink data corresponding to the high-priority service, which is not limited in this embodiment.
  • Step 1207 The OLT receives uplink data sent by each ONU through the first uplink channel and the second uplink channel.
  • the OLT is configured with a first uplink burst receiver and a second uplink burst receiver, and the OLT receives the uplink service data sent by the registered ONU from the first uplink channel by using the first uplink burst receiver. And receiving, by the second uplink burst receiver, the uplink service data sent by the registered ONU or the registration response message sent by the unregistered ONU from the second uplink channel.
  • the OLT when the generated uplink bandwidth grant is stored in the OLT, the OLT resets the built-in uplink burst receiver before the uplink data arrives, so as to indicate that the uplink burst receiver starts to receive the ONU in the first and second uplinks. Uplink data transmitted on the channel.
  • the OLT may further identify an ONU that transmits uplink data on the first uplink channel and an ONU that transmits uplink data on the second uplink channel according to the uplink bandwidth authorization, so as to further forward the uplink data.
  • the OLT can also perform authentication on the uplink data sent by the ONU according to the uplink bandwidth authorization, so as to determine whether there is an illegally accessed ONU in the PON system. For example, if the OLT detects uplink data outside the uplink transmission time slot indicated by the uplink bandwidth grant, it determines that there is an illegally accessed ONU in the PON system; for example, after the OLT receives the uplink data, according to the sender (sends the uplink data). The ONU sends an uplink transmission time slot of the uplink data, and searches for the corresponding ONU identifier in the uplink bandwidth grant.
  • the OLT directly filters the uplink data that has not passed the authentication. For the uplink data that is authenticated, the OLT further analyzes the uplink data to obtain the service information included in the uplink data.
  • the OLT generates a first uplink bandwidth authorization and a second uplink bandwidth authorization for controlling the first uplink channel and the second uplink channel, respectively, and multiplexing the first uplink bandwidth authorization and the second uplink bandwidth authorization. Therefore, the multiplexed uplink bandwidth grant is provided to each ONU through the downlink channel, so that the ONU can control the data transmission of the first uplink channel and the second uplink channel according to the received uplink bandwidth authorization, respectively, to ensure that the uplink data passes the first The uplink channel and the second uplink channel reach the OLT in an orderly manner to avoid collision between uplink data.
  • the OLT uses the generated uplink bandwidth grant to control the uplink burst receiver to receive uplink data, thereby improving the accuracy of the uplink data reception.
  • the OLT uses the uplink bandwidth grant to authenticate the received uplink data, thereby Avoid illegal access to the ONU to affect the PON system.
  • 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.

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Abstract

本申请公开了一种PON系统、OLT及ONU，涉及光通信领域，所述PON系统包括：OLT和至少两个ONU，OLT与至少两个ONU之间通过一条下行通道和两条上行通道进行数据交互；OLT通过下行通道向各个ONU发送下行数据，下行数据中包括上行带宽授权，上行带宽授权用于控制ONU发送上行数据；ONU通过下行通道接收下行数据；根据下行数据中包含的上行带宽授权，通过第一上行通道或第二上行通道发送上行数据；OLT通过第一上行通道和第二上行通道接收各个ONU发送的上行数据；其中，第一上行通道关闭注册功能，第二上行通道开启注册功能。

Description

无源光网络系统、光线路终端及光网络单元 技术领域
本申请涉及光通信领域，特别涉及一种无源光网络(Passive Optical Network，PON)系统、光线路终端(Optical Line Terminal，OLT)及光网络单元(Optical Network Unit，ONU)。
背景技术
无源光网络(Passive Optical Network，PON)是一种点对多点的网络拓扑结构，通常包括位于中心局的光线路终端(Optical Line Terminal，OLT)、位于用户端的多个光网络单元(Optical Network Unit，ONU)以及位于两者之间的光分配网络(Optical Distribution Network，ODN)。
PON系统中，新增ONU需要在OLT处完成注册激活后，才能通过上行通道向OLT发送上行业务数据。对于以太网无源光网络(Ethernet Passive Optical Network，EPON)系统，OLT通过开辟静默窗口(Quiet Zone)的方式，接收新增ONU通过上行通道发送的注册响应报文，从而根据注册响应报文中携带的媒体访问控制(Media Access Control，MAC)地址为新增ONU分配逻辑链路标识(Logical Link IDentifier，LLID)，并完成对新增ONU的测距；而对于吉比特无源光网络(Gigabit-Capable Passive Optical Network，GPON)系统，OLT通过开辟静默窗口的方式，接收新增ONU发送的注册响应报文，从而根据注册响应报文中携带的序列号(Serial Number，SN)分配ONU ID，并进一步完成对新增ONU的测距。
完成注册后，已注册的ONU根据OLT分配的上行发送时隙，采用时分多址(Time Division Multiple Access，TDMA)的方式通过上行通道向OLT发送上行业务数据，以此避免不同ONU发送的上行业务数据在上行通道上产生冲突。同时，为了避免上行通道中注册响应报文和上行业务数据之间产生冲突，在新增ONU注册期间，OLT将停止给已注册的ONU进行带宽授权，即已注册的ONU将停止发送上行业务数据。
PON系统中，已注册的ONU需要在静默窗口结束后才能发送上行业务数据，导致上行业务数据的发送存在较大时延，无法满足低延时业务对系统延时 的需求。
发明内容
为了解决已注册的ONU需要在静默窗口结束后才能发送上行业务数据，导致上行业务数据的发送存在较大时延，无法满足低延时业务对系统时延的需求的问题，本申请实施例提供了一种PON系统、OLT及ONU。所述技术方案如下：
第一方面，提供了一种PON系统，该系统包括：OLT和至少两个ONU，OLT与各个ONU之间通过ODN相连，且OLT与至少两个ONU之间通过一条下行通道和两条上行通道进行数据交互；
OLT通过下行通道向各个ONU发送下行数据，下行数据中包括上行带宽授权，上行带宽授权用于控制ONU发送上行数据；
ONU通过下行通道接收下行数据；根据下行数据中包含的上行带宽授权，通过第一上行通道或第二上行通道发送上行数据；
OLT通过第一上行通道和第二上行通道接收各个ONU发送的上行数据；
其中，第一上行通道关闭注册功能，第二上行通道开启注册功能，注册功能用于对未注册的ONU进行注册。
区别于现有技术中PON系统仅通过一条下行通道和一条上行通道进行数据交互，本实施例中，通过在PON系统中设置一条下行通道、关闭注册功能的第一上行通道以及开启注册功能的第二上行通道，使得OLT通过下行通道向各个ONU发送下行数据后，ONU能够根据下行数据中包含的上行带宽授权，将上行业务数据发送以及ONU注册划分至不同的上行通道，从而避免ONU注册对上行业务数据发送所产生的影响，满足低延时业务对系统时延的需求。
一种可能的设计中，下行数据中包含第一上行带宽授权和第二上行带宽授权，第一上行带宽授权用于控制ONU在第一上行通道上发送上行数据，第二上行带宽授权用于控制ONU在第二上行通道上发送上行数据。
一种可能的设计中，OLT生成第一上行带宽授权和第二上行带宽授权；对第一上行带宽授权和第二上行带宽授权进行复用，得到复用后的上行带宽授权；
ONU对接收到的上行带宽授权进行解复用，得到第一上行带宽授权和第二上行带宽；根据第一上行带宽授权在第一上行通道上发送上行数据；根据第 二上行带宽授权在第二上行通道上发送上行数据。
本实施例中，OLT生成分别用于控制第一上行通道和第二上行通道的第一上行带宽授权和第二上行带宽授权，并对该第一上行带宽授权和第二上行带宽授权进行复用，从而通过下行通道向各个ONU提供复用后的上行带宽授权，使得ONU能够根据接收到的上行带宽授权分别对第一上行通道和第二上行通道的数据发送进行控制，确保上行数据通过第一上行通道和第二上行通道有序达到OLT，避免上行数据之间产生冲突。
一种可能的设计中，第一上行通道用于传输上行业务数据，第二上行通道用于传输注册响应报文；
OLT生成包含上行发送时隙的第一上行带宽授权；生成包含注册时隙的第二上行带宽授权；
ONU处于已注册状态时，根据第一上行带宽授权中的上行发送时隙，通过第一上行通道向OLT发送上行业务数据；
或，
ONU处于未注册状态时，根据第二上行带宽授权中的注册时隙，通过第二上行通道向OLT发送注册响应报文。
区别于现有技术中，ONU通过同一条上行通道向OLT发送上行业务数据传输以及上行注册报文，本实施例中，ONU根据自身的注册状态，在处于已注册状态时，通过第一上行通道向OLT发送上行业务数据，从而与OLT进行业务通信；在处于未注册状态时，通过第二上行通道性OLT发送注册响应报文，从而在OLT处完成注册，使得PON系统中未注册的ONU在进行注册的同时，已注册的ONU仍能够向OLT发送上行业务数据，避免了PON系统中ONU注册所产生的时延。
一种可能的设计中，第一上行通道用于传输第一上行业务数据，第二上行通道用于传输注册响应报文及第二上行业务数据；
OLT生成包含第一上行发送时隙的第一上行带宽授权；生成包含第二上行发送时隙以及注册时隙的第二上行带宽授权；
ONU处于已注册状态时，根据第一上行带宽授权中的第一上行发送时隙，通过第一上行通道向OLT发送第一上行业务数据；根据第二上行带宽授权中的第二上行发送时隙，通过第二上行通道向OLT发送第二上行业务数据；
或，
ONU处于未注册状态时，根据第二上行带宽授权中的注册时隙，通过第二上行通道向OLT发送注册响应报文。
本实施例中，ONU通过第一上行通道发送低延时业务的上行业务数据，通过第二上行通道发送高延时业务的上行业务数据以及进行ONU注册，在避免ONU注册对低延时业务产生影响的同时，利用双上行通道进行业务数据发送，提高了上行业务数据的传输速率。
一种可能的设计中，OLT获取第一上行通道和第二上行通道的通道传输质量；当第一上行通道的通道传输质量优于第二上行通道的通道传输质量时，控制第一上行通道关闭注册功能，控制第二上行通道开启注册功能。
本实施例中，OLT根据第一上行通道和第二上行通道的通道传输质量灵活配置上行通道上注册功能的开启或关闭，确保低延时业务能够在较好传输质量的上行通道上进行传输，进一步提高了PON系统的数据传输质量。
一种可能的设计中，OLT存储生成的上行带宽授权；
OLT根据上行带宽授权控制上行数据接收，和/或，根据上行带宽授权对各个ONU发送的上行数据进行鉴权及解析。
本实施例中，OLT利用生成的上行带宽授权控制上行数据的接收，提高了上行数据接收的准确性；同时，OLT利用该上行带宽授权对接收到的上行数据进行鉴权，从而对非法ONU发送的上行数据进行过滤，避免非法接入的ONU对PON系统造成影响，进一步提高了PON系统的安全性。
一种可能的设计中，ONU根据各个业务的延时需求确定各个业务所属的业务分类；
ONU在业务分类指示业务属于第一分类时，通过第一上行通道发送业务对应的上行数据；
或，
ONU在业务分类指示业务属于第二分类时，通过第二上行通道发送业务对应的上行数据；
其中，属于第一分类的业务的延时需求高于属于第二分类的业务的延时需求。
本实施例中，ONU根据业务的延时需求对业务进行分类，并选择关闭注册功能的第一上行通道发送低延时业务对应的上行数据，选择开启注册功能的第二上行通道发送高延时业务对应的上行数据，确保低延时业务不受ONU注 册的影响，满足低延时业务对系统时延的需求。
一种可能的设计中，若系统为GPON系统，则BWmap消息中携带上行带宽授权；
若系统为EPON系统，则Gate消息中携带上行带宽授权。
针对不同类型的PON系统，OLT采用不同类型的消息携带上行带宽授权，从而利用上行带宽授权实现对ONU的上行控制，提高了OLT的适用性。
一种可能的设计中，当BWmap消息中携带上行带宽授权时，BWmap消息中预定字段的预定比特位用于标识BWmap消息对应的上行通道；
当Gate消息中携带上行带宽授权时，Gate消息中新增的通道标识字段用于标识Gate消息对应的上行通道，或，Gate消息的操作码用于标识Gate消息对应的上行通道。
其中，预定字段为start time字段或GrantSize字段，预定比特位为预定字段的最高1bit或最高2bit。
一种可能的设计中，下行通道、第一上行通道和第二上行通道采用波分复用的方式共用ODN，且第一上行通道与第二上行通道的波长不同。
本实施例中，PON系统中的上下行通道分别采用不同的波长，通过波分复用的方式共用ODN，从而避免上下行通道之间产生干扰，确保上行数据和下行数据的正常传输。
第二方面，提供了一种OLT，该OLT包括：至少一个动态带宽分配(Dynamic Bandwidth Allocation，DBA)调度模块、下行传输汇聚(Transmission Convergence，TC)模块、上行TC模块、下行发射机、第一上行突发接收机和第二上行突发接收机；
DBA调度模块用于生成上行带宽授权，上行带宽授权用于控制各个ONU发送上行数据；
下行TC模块与DBA调度模块相连，用于通过下行成帧汇聚生成包含上行带宽授权的下行数据；
下行发射机与下行TC模块相连，用于通过下行通道向各个ONU发送下行数据；
上行TC模块与第一上行突发接收机相连，用于通过第一上行突发接收机接收各个ONU在第一上行通道上发送的上行数据；
上行TC模块还与第二上行突发接收机相连，用于通过第二上行突发接收 机接收各个ONU在第二上行通道上发送的上行数据；
其中，第一上行通道关闭注册功能，第二上行通道开启注册功能，注册功能用于对未注册的ONU进行注册。
区别于现有技术中OLT通过一条上行通道完成上行业务数据接收及ONU注册，本实施例中，OLT通过关闭注册功能的第一上行通道以和开启注册功能的第二上行通道分别完成上行业务数据接收及ONU注册，在确保ONU进行正常注册的前提下，避免ONU注册对低延时业务上行数据发送所产生的影响，从而满足低延时业务对系统时延的需求。
一种可能的设计中，下行数据中包含第一上行带宽授权和第二上行带宽授权，第一上行带宽授权用于控制ONU在第一上行通道上发送上行数据，第二上行带宽授权用于控制ONU在第二上行通道上发送上行数据。
一种可能的设计中，OLT包括第一DBA调度模块、第二DBA调度模块以及复用模块；
第一DBA调度模块用于生成第一上行带宽授权；
第二DBA调度模块用于生成第二上行带宽授权；
复用模块分别与第一DBA调度模块和第二DBA调度模块相连，用于对第一上行带宽授权和第二上行带宽授权进行复用；
复用模块还与下行TC模块相连，用于向下行TC模块提供复用后的上行带宽授权。
本实施例中，OLT利用第一DBA调度模块生成第一上行带宽授权，利用第二DBA调度模块生成第二上行带宽授权，并通过复用模块对第一上行带宽授权和第二上行带宽授权进行复用，从而通过下行通道向各个ONU提供复用后的上行带宽授权，使得根据ONU能够根据接收到的上行带宽授权分别对第一上行通道和第二上行通道的上行数据发送进行控制，确保上行数据通过第一上行通道和第二上行通道有序达到OLT，避免上行数据之间产生冲突。
一种可能的设计中，第一上行通道用于传输上行业务数据，第二上行通道用于传输注册响应报文；
第一DBA调度模块，用于生成包含上行发送时隙的第一上行带宽授权；
第二DBA调度模块，用于生成包含注册时隙的第二上行带宽授权；
其中，上行发送时隙用于指示已注册的ONU在第一上行通道上发送上行业务数据，注册时隙用于指示未注册的ONU在第二上行通道上发送注册响应 报文。
本实施例中，OLT通过第一DBA调度模块控制第一上行通道仅用于传输上行业务数据，通过第二DBA调度模块控制第二上行通道仅用于传输注册响应报文，使得PON系统中未注册的ONU通过第二上行通道发送注册响应报文的同时，已注册的ONU仍能够通过第一上行通道发送上行业务数据，从而避免ONU注册对上行业务数据发送所造成的影响。
一种可能的设计中，第一上行通道用于传输第一上行业务数据，第二上行通道用于传输注册响应报文及第二上行业务数据；
第一DBA调度模块，用于生成包含第一上行发送时隙的第一上行带宽授权；
第二DBA调度模块，用于生成包含第二上行发送时隙以及注册时隙的第二上行带宽授权；
其中，第一上行发送时隙用于指示已注册的ONU在第一上行通道上发送第一上行业务数据，第二上行发送时隙用于指示已注册的ONU在第二上行通道上发送第二上行业务数据，注册时隙用于指示未注册的ONU在第二上行通道上发送注册响应报文，第一上行业务数据的延时需求高于第二上行业务数据的延时需求。
本实施例中，OLT通过第一DBA调度模块控制第一上行通道仅用于传输低延时业务对应的上行业务数据，通过第二DBA调度模块控制第二上行通道用于传输注册响应报文以及高延时业务对应的上行业务数据，在避免ONU注册对低延时业务产生影响的同时，利用双上行通道进行上行业务数据发送，提高了上行业务数据的传输速率。
一种可能的设计中，OLT还包括控制模块，控制模块分别与第一DBA调度模块和第二DBA调度模块相连；
控制模块，用于控制第一DBA调度模块关闭注册功能，并控制第二DBA调度模块开启注册功能；
其中，开启注册功能的第二DBA调度模块生成的第二上行带宽授权中包含注册时隙，注册时隙用于指示未注册的ONU在第二上行通道上发送注册响应报文。
本实施例中，通过在OLT中设置控制模块，并利用该控制模块控制第一、第二DBA调度模块开闭注册功能，实现了对第一上行通道和第二上行通道的 灵活配置。
一种可能的设计中，OLT包括一个DBA调度模块以及与DBA调度模块相连的控制模块；
控制模块，用于控制DBA调度模块开启或关闭注册功能；
DBA调度模块，用于在关闭注册功能时，生成包含第一上行发送时隙的第一上行带宽授权，或，生成包含第一上行发送时隙的第一上行带宽授权以及包含第二上行发送时隙的第二上行带宽授权；
DBA调度模块，还用于在开启注册功能时，生成包含第一上行发送时隙的第一上行带宽授权以及包含注册时隙的第二上行带宽授权；
其中，第一上行发送时隙用于指示已注册的ONU在第一上行通道上发送上行业务数据，第二上行发送时隙用于指示已注册的ONU在第二上行通道上发送上行业务数据，注册时隙用于指示未注册的ONU在第二上行通道上发送注册响应报文。
本实施例中，OLT通过控制模块控制DBA调度模块开闭注册功能，由DBA调度模块根据注册功能的开闭状态生成相应的第一上行带宽授权以及第二上行带宽授权，实现对第一上行通道和第二上行通道的有序管理。
一种可能的设计中，OLT中还包括存储器；
存储器与各个DBA调度模块相连，用于存储各个DBA调度模块生成的上行带宽授权；
上行TC模块与存储器相连，用于根据上行带宽授权控制第一上行突发接收机和第二上行突发接收机接收上行数据，和/或，根据上行带宽授权对各个ONU发送的上行数据进行鉴权及解析。
本实施例中，上行TC模块利用生成的上行带宽授权控制各个上行突发接收机接收上行数据，提高了上行数据接收的准确性；同时，上行TC模块利用该上行带宽授权对接收到的上行数据进行鉴权，从而对非法ONU发送的上行数据进行过滤，避免非法接入的ONU对PON系统造成影响，进一步提高了PON系统的安全性。
一种可能的设计中，若OLT用于GPON系统，则BWmap消息中携带该上行带宽授权；
若OLT用于EPON系统，则Gate消息中携带该上行带宽授权。
一种可能的设计中，当BWmap消息中携带上行带宽授权时，BWmap消 息中预定字段的预定比特位用于标识BWmap消息对应的上行通道；
当Gate消息中携带上行带宽授权时，Gate消息中新增的通道标识字段用于标识Gate消息对应的上行通道，或，Gate消息的操作码用于标识Gate消息对应的上行通道；其中，预定字段为start time字段或GrantSize字段，预定比特位为预定字段的最高1bit或最高2bit。
一种可能的设计中，下行通道、第一上行通道和第二上行通道采用波分复用的方式共用同一光分配网络ODN，且第一上行通道与第二上行通道的波长不同。
第三方面，提供了一种ONU，该ONU包括：下行TC模块、至少一个DBA响应模块、上行TC模块、下行接收机、第一上行突发发射机和第二上行突发发射机；
下行TC模块分别与下行接收机和DBA响应模块相连，用于向DBA响应模块提供下行接收机通过下行通道接收到的下行数据，下行数据由OLT发送；
DBA响应模块与上行TC模块相连，用于根据下行数据中包含的上行带宽授权控制上行TC模块发送上行数据；
上行TC模块与第一上行突发发射机相连，用于通过第一上行突发发射机在第一上行通道上发送上行数据；
上行TC模块与第二上行突发发射机相连，用于通过第二上行突发发射机在第二上行通道上发送上行数据；
其中，第一上行通道关闭注册功能，第二上行通道开启注册功能，注册功能用于对未注册的ONU进行注册。
区别于现有技术中ONU通过一条上行通道完成上行业务数据发送及ONU注册，本实施例中，ONU通过关闭注册功能的第一上行通道以和开启注册功能的第二上行通道分别完成上行业务数据发送及ONU注册，避免了ONU注册对上行业务数据发送所产生的影响，从而满足低延时业务对系统时延的需求。
一种可能的设计中，下行数据中包含第一上行带宽授权和第二上行带宽授权，第一上行带宽授权用于控制ONU在第一上行通道上发送上行数据，第二上行带宽授权用于控制ONU在第二上行通道上发送上行数据。
一种可能的设计中，ONU包括第一DBA响应模块、第二DBA响应模块和解复用模块；
解复用模块与下行TC模块相连，用于对下行TC模块接收到的上行带宽授权进行解复用，得到第一上行带宽授权和第二上行带宽授权；
第一DBA响应模块与解复用模块相连，用于根据第一上行带宽授权控制上行TC模块通过第一上行通道发送上行数据；
第二DBA响应模块与解复用模块相连，用于根据第二上行带宽授权控制上行TC模块通过第二上行通道发送上行数据。
本实施例中，ONU接收到下行数据后，利用解复用模块对下行数据中的上行带宽授权进行解复用，得到第一上行带宽授权和第二上行带宽授权，从而根据第一上行带宽授权和第二上行带宽授权分别进行上行数据发送，确保上行数据有序达到OLT，避免上行数据间产生冲突。
一种可能的设计中，第一上行通道用于传输上行业务数据，第二上行通道用于传输注册响应报文；
若ONU处于已注册状态，上行TC模块，用于根据第一上行带宽授权中的上行发送时隙，向第一上行突发发射机发送第一使能信号，第一使能信号用于指示第一上行突发发射机通过第一上行通道发送上行业务数据；
若ONU处于未注册状态，上行TC模块，用于根据第二上行带宽授权中的注册时隙，向第二上行突发发射机发送第二使能信号，第二使能信号用于指示第二上行突发发射机通过第二上行通道发送注册响应报文。
本实施例中，第一上行通道被配置为仅用于传输上行业务数据，第二上行通道被配置为仅用于传输注册响应报文，使得PON系统中未注册的ONU通过第二上行通道发送注册响应报文的同时，已注册的ONU能够通过第一上行通道发送上行业务数据，从而避免注册数据报文对上行业务数据发送所造成的影响。
一种可能的设计中，ONU中包括光模块槽位，光模块槽位用于插入第一光模块或第二光模块；
第一光模块中至少包括下行接收机和所述第一上行突发发射机；
第二光模块中至少包括下行接收机和第二上行突发发射机；
其中，当ONU处于未注册状态时，第二光模块插入光模块槽位；当ONU处于已注册状态时，第一光模块插入光模块槽位。
本实施例中，通过将下行接收机和第一上行突发发射机集成到第一光模块中，将下行接收机和第二上行突发发射机集成到第二光模块中，使得不同的新 增ONU均能够使用同一第二光模块完成ONU注册，从而提高了第二上行突发发射机的利用率，降低了ONU的制造成本。
一种可能的设计中，第一上行通道用于传输第一上行业务数据，第二上行通道用于传输注册响应报文及第二上行业务数据，第一上行业务数据的延时需求高于第二上行业务数据的延时需求；
若ONU处于已注册状态，上行TC模块，用于根据第一上行带宽授权中的第一上行发送时隙，向第一上行突发发射机发送第三使能信号，第三使能信号用于指示第一上行突发发射机通过第一上行通道发送第一上行业务数据；根据第二上行带宽授权中的第二上行发送时隙，向第二上行突发发射机发送第四使能信号，第四使能信号用于指示第二上行突发发射机通过第二上行通道发送第二上行业务数据；
若ONU处于未注册状态，上行TC模块，用于根据第二上行带宽授权中的注册时隙，向第二上行突发发射机发送第五使能信号，第五使能信号用于指示第二上行突发发射机通过第二上行通道发送注册响应报文。
本实施例中，第一上行通道被配置为仅用于传输第一上行业务数据，第二上行通道被配置为用于传输注册响应报文及第二上行业务数据，在确保ONU注册不会对第一上行业务数据发送造成影响的情况下，同时利用两个上行通道进行上行业务数据传输，从而提高了PON系统中上行业务数据的传输速率。
一种可能的设计中，ONU还包括业务分类模块；
业务分类模块，用于收集各个业务的延时需求，并根据延时需求确定各个业务所属的业务分类；
DBA响应模块与业务分类模块相连，用于当业务分类指示业务属于第一分类时，控制上行TC模块通过第一上行通道发送业务对应的第一上行业务数据；
DBA响应模块，还用于当业务分类指示业务属于第二分类时，控制上行TC模块通过第二上行通道发送业务对应的第二上行业务数据。
本实施例中，ONU通过业务分类模块对业务进行分类，并选择关闭注册功能的第一上行通道发送低延时业务对应的上行数据，选择开启注册功能的第二上行通道发送高延时业务对应的上行数据，确保低延时业务不受ONU注册的影响，满足低延时业务对系统时延的需求。
一种可能的设计中，ONU中包括第一光模块槽位和第二光模块槽位，第 一光模块槽位用于插入第一光模块，第二光模块槽位用于插入第二光模块；
第一光模块中至少包括第一上行突发发射机；
第二光模块中至少包括下行接收机和第二上行突发发射机；
其中，当传输第二上行业务数据时，第二光模块插入第二光模块槽位；当传输第一上行业务数据和第二上行业务数据时，第二光模块插入第二光模块槽位且第一光模块插入第一光模块槽位。
一种可能的设计中，ONU包括一个DBA响应模块和通道选择模块；
通道选择模块分别与第一上行突发发射机、第二上行突发发射机和上行TC模块相连；
DBA响应模块，用于根据第一上行带宽授权控制上行TC模块发送上行业务数据，或，根据第二上行带宽授权控制上行TC模块发送注册响应报文；
通道选择模块，用于在ONU处于已注册状态时，选择第一上行突发发射机发送上行TC模块生成的上行业务数据，或，在ONU处于未注册状态时，选择第二上行突发发射机发送上行TC模块生成的注册响应报文。
本实施例中，ONU中的通道选择模块根据ONU所处的注册状态，通过第一上行通道发送上行业务数据，或，通过第二上行通道发送注册相应报文，实现了ONU的动态节能。
一种可能的设计中，若ONU用于GPON系统，则BWmap消息中携带该上行带宽授权；
若ONU用于EPON系统，则Gate消息中携带该上行带宽授权。
一种可能的设计中，当BWmap消息中携带上行带宽授权时，BWmap消息中预定字段的预定比特位用于标识BWmap消息对应的上行通道；
当Gate消息中携带上行带宽授权时，Gate消息中新增的通道标识字段用于标识Gate消息对应的上行通道，或，Gate消息的操作码用于标识Gate消息对应的上行通道；
其中，预定字段为start time字段或GrantSize字段，预定比特位为预定字段的最高1bit或最高2bit。
一种可能的设计中，下行通道、第一上行通道和第二上行通道采用波分复用的方式共用同一ODN，且第一上行通道与第二上行通道的波长不同。
附图说明
图1示出了本申请一个实施例提供的PON系统的系统架构图；
图2示出了本申请第一个实施例提供的OLT的结构示意图；
图3示出了本申请第二个实施例提供的OLT的结构示意图；
图4示出了本申请第三个实施例提供的OLT的结构示意图；
图5示出了本申请第一个实施例提供的ONU的结构示意图；
图6示出了本申请第二个实施例提供的ONU的结构示意图；
图7示出了本申请第三个实施例提供的ONU的结构示意图；
图8示出了本申请第四个实施例提供的ONU的结构示意图；
图9示出了本申请第五个实施例提供的ONU的结构示意图；
图10示出了本申请第六个实施例提供的ONU的结构示意图；
图11示出了本申请一个实施例提供的PON系统中数据交互过程的流程图；
图12示出了本申请另一个实施例提供的PON系统中数据交互过程的流程图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
现有技术中，PON系统中仅包含一条下行通道和一条上行通道OLT即通过该下行通道并采用时分复用的方式向已注册的ONU发送下行数据；相应的，已注册的ONU均通过该上行通道，并采用时分多址的方式在各自的上行发送时隙内向OLT发送上行业务数据，从而避免上行业务数据冲突。但是由于PON系统中新增ONU也需要通过该上行通道在OLT处进行注册，因此，在新增ONU进行注册期间(通常为200至250us)，已注册的各个ONU需要停止在上行通道上发送上行业务数据，从而避免新增ONU发送的注册响应报文与已注册ONU发送的上行业务数据之间产生冲突。虽然通过上述防冲突机制能够有 效避免上行业务数据与注册响应报文产生冲突，但是会增加上行业务数据的延时，导致现有的PON系统无法满足高清视频(4K、8K视频)业务、增强现实(Augmented Reality、AR)业务、虚拟现实(Virtual Reality、VR)或移动前端回传(Mobile Fronthual)业务等低延时业务的延时需求。
而本申请各个实施例中，PON系统中包含一条下行通道和两条上行通道，且两条上行通道中的一条开启注册功能，而另一条关闭注册功能。PON系统中未注册的ONU利用开启注册功能的上行通道进行注册激活的同时，已注册的ONU可以利用关闭注册功能的上行通道发送上行业务数据，即OLT能够同时接收ONU发送的上行业务数据以及注册响应报文，从而避免ONU注册激活对上行业务数据发送造成的影响。
请参考图1，其示出了本申请一个实施例提供的PON系统的系统架构图，该PON系统中包括：OLT110和至少一个ONU120，OLT110与各个ONU120之间通过ODN130相连。
OLT110是PON系统中的局端设备，具有ONU注册、带宽分配和下行数据发送等功能。
本申请各个实施例中，OLT110中设置有一个下行发射机、第一上行突发接收机以及第二上行突发接收机。其中，OLT110利用该下行发射机(通过ODN130中的下行通道)向ONU120发送下行数据，利用第一上行突发接收机和第二上行突发接收机接收ONU120突发发送的上行数据。
ODN130用于为OLT110和各个ONU120之间提供光传输通道。具体的，该ODN130由光纤131和功分器132构成。
本申请实施例中，PON系统中包括下行通道、第一上行通道和第二上行通道，且下行通道、第一上行通道和第二上行通道作为ODN130上的逻辑通道，采用波分复用的方式共用ODN130。同时，为了避免通道之间的相互影响，下行通道的波长为λ1，第一上行通道的波长为λ2，第二上行通道的波长为λ3，其中，λ2≠λ3。
ONU120是PON系统中的用户端设备，具有注册响应、带宽分配请求和下行数据接收等功能。
本申请各个实施例中，各个ONU120中均设置有一个下行接收机、第一上行突发发射机以及第二上行突发发射机。其中，ONU120利用该下行接收机从 下行通道接收OLT110发送的下行数据，利用第一上行突发发射机在第一上行通道上突发发送上行数据，利用第二上行突发发射机在第二上行通道上突发发送上行数据。
需要说明的是，图1所示的PON系统可以为EPON系统或GPON系统，本申请实施例并不对此进行限定。
请参考图2，其示出了本申请一个实施例提供的OLT的结构示意图。本实施例以该OLT用于图1所述PON系统为例进行说明。该OLT包括：至少一个DBA调度模块210、下行TC模块220、上行TC模块230、下行发射机240、第一上行突发接收机241和第二上行突发接收机242。
DBA调度模块210具有控制调度功能，用于生成上行带宽授权，并利用该上行带宽授权控制各个ONU通过第一及第二上行通道发送上行数据。具体的，DBA调度模块210生成的第一上行带宽授权用于控制ONU通过第一上行通道发送上行数据，DBA调度模块210生成的第二上行带宽授权用于控制ONU通过第二上行通道发送上行数据。
需要说明的是，针对不同的PON系统，用于携带DBA调度模块210生成的上行带宽授权的消息也不同。可选的，当该OLT用于GPON系统时，用于携带该上行带宽授权的消息为BWmap消息；当该OLT用于EPON系统时，用于携带该上行带宽授权的消息为Gate消息。本申请实施例并不对携带上行带宽授权的消息的具体类型进行限定。
下行TC模块220与各个DBA调度模块210相连，用于获取各个DBA调度模块210生成的上行带宽授权，并通过下行成帧汇聚生成包含该上行带宽授权的下行数据。其中，该下行数据中还包括ONU请求获取的下行业务数据，比如ONU请求获取的视频数据、语音数据等等。
可选的，下行TC模块220完成上层业务适配、GPON封装方式(G-PON Encapsulation Mode，GEM)封装、TC成帧以及物理层适配后，生成该下行数据，其中，上层业务适配包括用户数据适配、光网络单元管理控制接口(ONU Management and Control Interface，OMCI)适配等等。
可选的，由于第一上行通道和第二上行通道对应的上行带宽授权均通过同一个下行通道发送给ONU，相应的，ONU接收到上行带宽授权后，需要进一步确定上行带宽授权所对应的上行通道，从而根据识别出的上行带宽授权在相 应上行通道上进行上行数据发送，因此，上行带宽授权中包含上行通道标识，使得ONU能够根据该上行通道标识对接收到的上行带宽授权进行识别。
下行发射机240与下行TC模块220相连，用于通过下行通道向各个ONU发送下行TC模块220生成的下行数据。
其中，下行发射机240采用广播的方式向PON系统中各个ONU发送下行数据，且该下行数据以光载波信号的形式在下行通道中传输。
OLT通过DBA调度模块210、下行TC模块220和下行发射机240即可完成下行数据发送；接收到下行数据的ONU即根据下行数据中包含的上行带宽授权，通过第一上行通道或第二上行通道进行上行数据传输。
在一种可能的设计中，ONU通过上行通道发送上行数据包含如下情况：
1、ONU未注册时，通过第二上行通道发送注册响应报文；
2、ONU已注册时，通过第一上行通道发送上行业务数据(低延时业务、高延时业务的上行业务数据均在第一上行通道发送)；
3、ONU已注册，且系统中不包含未注册ONU时，通过第一上行通道发送低延时业务的上行业务数据，并通过第二上行通道发送高延时业务的上行业务数据；
4、ONU已注册，且系统中包含未注册ONU时，仅通过第一上行通道发送低延时业务的上行业务数据。
如图2所示，OLT中的上行TC模块230分别与第一上行突发接收机251和第二上行突发接收机252相连，从而通过第一上行突发接收机251接收ONU在第一上行通道上传输的上行数据，通过第二上行突发接收机252接收ONU在第二上行通道上传输的上行数据。其中，上行数据以光载波信号的形式在第一上行通道和第二上行通道上传输。
本申请实施例中，第一上行通道关闭注册功能，第二上行通道开启注册功能，且第一上行通道以及第二上行通道注册功能的开闭由DBA调度模块210控制。
在第一上行通道关闭注册功能，且第二上行通道开启注册功能的情况下，PON系统中未注册的ONU只能通过第二上行通道发送注册响应报文，相应的，OLT只能够通过第二上行突发接收机262从第二上行通道处接收该注册响应报文，并根据该注册响应报文为未注册的ONU进行注册。
显而易见的，PON系统中未注册的ONU通过第二上行通道向OLT发送注 册响应报文的同时，系统中已注册的ONU仍旧可以通过第一上行通道向OLT发送上行业务数据，且不同上行通道中的上行业务数据和注册响应报文之间不会产生冲突。
易于思及的，ONU可以通过第一上行通道传输低延时业务(对延时要求较高的业务)对应的上行业务数据，通过第二上行通道传输注册响应报文和/或高延时业务(对延时要求较低的业务)对应的上行业务数据，从而在保证未注册ONU正常注册的前提下，确保系统满足低延时业务的延时需求。
需要说明的是，由于下行通道、第一上行通道和第二上行通道采用波分复用的方式共用同一个ODN，且第一上行通道和第二上行通道的波长互不相同，因此，该OLT中还设置有合/分波器260，用于对上下行通道中的光载波信号进行聚合或分离。
在一种可能的实施方式中，OLT中设置有两个DBA调度模块，OLT即通过两个DBA调度模块分别控制第一上行通道和第二上行通道的上行数据发送。在图2所示OLT的基础上，如图3所示，OLT中包括第一DBA调度模块211、第二DBA调度模块212以及复用模块270。
其中，第一DBA调度模块211用于生成第一上行带宽授权，该第一上行带宽授权用于控制第一上行通道上的上行数据发送；第二DBA调度模块212用于生成第二上行带宽授权，该第二上行带宽授权用于控制第二上行通道上的上行数据发送。
可选地，为了实现第一上行通道和第二上行通道的负载均衡，第一DBA调度模块211与第二DBA调度模块212相连，当生成上行带宽授权时，第一DBA调度模块211和第二DBA调度模块212即通过该连接进行信息交互，从而实现上行带宽的调度优化，本申请实施例并不对此进行限定。
复用模块270分别与第一DBA调度模块211和第二调度模块212相连，用于获取第一上行带宽授权和第二上行带宽授权，并对上述上行带宽授权进行复用，最终生成复用后的上行带宽授权。
由于第一及第二上行带宽授权经过复用后通过同一下行通道发送给ONU，为了使ONU能够识别出第一及第二上行带宽授权，并确定不同上行带宽授权所对应的上行通道，复用模块270获取到第一上行带宽授权和第二上行带宽授权后，需要为上行带宽授权添加相应的上行通道标识，然后对添加上行通道标 识后的上行带宽授权进行复用。可选的，该上行通道标识也可以由DBA调度模块生成，即DBA调度模块直接生成携带有上行通道标识的上行带宽授权，本申请实施例并不对此进行限定。
在一种可能的实施方式中，当该OLT用于GPON系统时，复用模块270分别在第一BWmap消息(由第一DBA调度模块生成)和第二BWmap消息(由第二DBA调度模块生成)中添加上行通道标识。
具体的，由于BWmap中的start time字段和GrantSize字段都为16bit，但实际取值范围为0-9719，即仅使用了14bit，因此，复用模块270可利用start time字段和GrantSize字段最高的1bit或2bit标识BWmap消息对应的上行通道。例如，当最高1bit为0时，表示该BWmap消息对应第一上行通道，当最高1bit为1时，表示该BWmap消息对应第二上行通道；或者，当最高2bit为00时，表示该BWmap消息对应第一上行通道，当最高2bit为11时，表示该BWmap对应第二上行通道。
在另一种可能的实施方式中，当该OLT用于EPON系统时，复用模块(或DBA调度模块)在Gate消息中新增通道标识字段来指示Gate消息对应的上行通道。比如，在Gate消息中新增通道标识字段CH_Num，当CH_Num为0x00时，表示该Gate消息对应第一上行通道，当CH_Num为0x01时，表示该Gate消息对应第二上行通道。
可选的，当该OLT用于EPON系统时，还可以采用不同的操作码(Operation code，Opcode)对Gate消息对应的上行通道进行标识。比如，当Gate消息的操作码为0xaa时，表示该Gate消息对应第一上行通道，当Gate消息的操作码为0xbb时，表示该Gate消息对应第二上行通道。
对第一上行带宽授权和第二上行带宽授权进行上行通道标识后，复用模块270即对第一上行带宽授权和第二上行带宽授权进行聚合复用，从而得到复用后的上行带宽授权。
复用模块270还与下行TC模块220相连，用于向下行TC模块220提供复用后的上行带宽授权，由下行TC模块220通过下行发射机240在下行通道上发送包含上行带宽授权的下行数据。
可选地，复用模块270还与上行TC模块230相连，用于向上行TC模块230提供复用后的上行带宽授权，相应的，上行TC模块230根据该上行带宽授权控制第一上行突发接收机251接收ONU在第一上行通道上传输的上行数 据，控制第二上行突发接收机252接收ONU在第二上行通道上传输的上行数据。
由于第一上行通道和第二上行通道上的上行数据是突发发送的，为了使OLT知悉上行数据何时到达，以便OLT中的上行突发接收机在上行数据到达前做好数据接收准备，可选的，如图3所示，该OLT中还包括存储器280，其中，该存储器280分别与各个DBA调度模块相连，且该存储器280还分别与复用模块270以及上行TC模块230相连。
存储器280获取到各个DBA调度模块生成的上行带宽授权后，将该上行带宽授权复制成两份，一份发送给复用模块270，由该复用模块270对上行带宽授权进行复用后，交由下行TC模块220通过下行成帧汇聚生成包含该上行带宽授权的下行数据，并最终将该下行数据发送给ONU；另一份则存储起来，并发送给上行TC模块230，由上行TC模块230根据该上行带宽授权控制第一上行突发接收机251接收ONU在第一上行通道上突发发送的上行数据，控制第二上行突发接收机252接收ONU在第二上行通道上突发发送的上行数据。
可选的，上行TC模块230获取上行带宽授权后，在上行数据到达之前分别对第一上行突发接收机251以及第二上行突发发射机252进行复位，以便指示第一上行突发接收机251开始接收ONU在第一上行通道上传输的上行数据，指示第二上行突发接收机252开始接收ONU在第二上行通道上传输的上行数据。
进一步地，上行TC模块230还可以根据上行带宽授权识别出第一上行通道上传输上行数据的ONU以及在第二上行通道上传输上行数据的ONU，以便实现对上行数据的进一步转发。
进一步的，上行TC模块230还可以根据上行带宽授权对ONU发送的上行数据进行鉴权，从而判断PON系统中是否存在非法接入的ONU。比如，若上行TC模块230在上行带宽授权所指示上行发送时隙之外检测到上行数据，则确定PON系统中存在非法接入的ONU；又比如，上行TC模块230接收到上行数据后，根据发送方(发送上行数据的ONU)发送上行数据的上行发送时隙，在上行带宽授权中查找对应的ONU标识，若查找到的ONU标识与发送方的ONU标识不一致，则确定PON系统中存在非法接入的ONU，其中，该ONU标识为OLT分配的LLID或ONU ID。对于未通过鉴权的上行数据，OLT直接对其进行过滤，对于通过鉴权的上行数据，OLT则进一步对该上行数 据进行解析，从而获得上行数据中包含的业务信息。
在其他可能的实施方式中，复用模块270还可以分别与第一DBA调度模块211和第二DBA调度模块212相连，并向相连的存储器280提供复用后的上行带宽授权，由存储器280分别向相连的下行TC模块220和上行TC模块230提供复用后的上行带宽授权，本申请实施例并不对复用模块和存储器的连接顺序进行限定。
本实施例中，利用存储器向上行TC模块提供上行带宽授权，使得上行TC模块能够根据该上行带宽授权控制上行突发接收机接收上行数据，提高了上行数据接收的准确性；同时，上行TC模块还可以利用该上行带宽授权对接收到的上行数据进行鉴权，从而避免非法接入的ONU对PON系统造成影响。
图3所示的OLT中，当第一DBA调度模块211被配置为关闭注册功能，且第二DBA调度模块212被配置为开启注册功能时，新增的ONU只能在第二DBA调度模块212对应的第二上行通道上进行注册。为了实现注册功能的灵活配置，如图3所示，该OLT中还包括控制模块290。
控制模块290分别与第一DBA调度模块211和第二DBA调度模块212相连，用于控制第一DBA调度模块211和第二DBA调度模块212中的某一DBA调度模块开启注册功能，从而控制相应上行通道上注册功能的开闭。
可选的，控制模块290根据接收到的配置命令，对第一DBA调度模块211及第二DBA调度模块212注册功能的开闭进行配置。其中，该配置命令由与OLT相连的外接设备输入。
可选的，控制模块290每隔预定时间间隔获取第一上行通道和第二上行通道的通道传输质量，当第一上行通道的通道传输质量优于第二上行通道的通道传输质量时，控制第一DBA调度模块211关闭注册功能，控制第二DBA调度模块212开启注册功能；当第二上行通道的通道传输质量优于第一上行通道的通道传输质量时，控制第一DBA调度模块211关闭注册功能，控制第二DBA调度模块212开启注册功能。本申请各个实施例中，仅以控制模块290控制第一DBA调度模块211关闭注册功能，控制第二DBA调度模块212开启注册功能为例进行说明，并不对本申请构成限定。
关闭注册功能的第一DBA调度模块生成的第一上行带宽授权中包含上行发送时隙，PON系统中已注册的ONU即根据该上行发送时隙在第一上行通道发送上行业务数据；而开启注册功能的第二DBA调度模块生成的第二上行带 宽授权中包含注册时隙，PON系统中未注册的ONU根据该注册时隙在第二上行通道上发送注册响应报文，最终由OLT根据该注册响应报文为其完成注册激活。
可选的，图3所示OLT配置第一上行通道仅用于传输上行业务数据，配置第二上行通道仅用于传输注册响应报文，即PON系统中的所有上行业务数据均通过第一上行通道传输，系统中所有注册响应报文均通过第二上行通道传输。
第一DBA调度模块211，用于生成包含上行发送时隙的第一上行带宽授权。
该上行发送时隙用于指示PON系统中已注册ONU通过第一上行通道发送上行业务数据，且不同ONU对应的上行发送时隙各不相同。上行发送时隙的指定方式可参考GPON系列标准和/或EPON系列标准，本申请实施例并不对此进行限定。
可选的，该第一上行带宽授权中包括ONU标识与上行发送时隙之间的对应关系，ONU即根据该自身ONU标识查找相应的上行发送时隙，并在该上行发送时隙所指示的时段内突发发送上行业务数据。
第二DBA调度模块212，用于生成包含注册时隙的第二上行带宽授权。
注册时隙用于指示PON系统中未注册的ONU在第二上行通道上发送注册响应报文。未注册的ONU通过下行通道接收到第二上行带宽授权，且检测到该第二上行带宽授权中包含注册时隙时，即在该注册时隙所指示的时段发送注册响应报文。
显而易见的，在注册周期内(即静默窗口)，未注册的ONU通过第二上行通道发送注册响应报文，已注册的ONU通过第一上行通道发送上行业务数据，两者之间互不冲突；而在非注册周期内，已注册的ONU通过第一上行通道发送上行业务数据，而第二上行通道则处于关闭状态，此时，OLT的第二上行突发接收机以及ONU的第二上行突发发射机均停止工作，从而实现PON系统的动态节能。
可选的，图3所示OLT配置第一上行通道仅用于传输第一上行业务数据，配置第二上行通道用于传输注册响应报文以及第二上行业务数据。
第一DBA调度模块211，用于生成包含第一上行发送时隙的第一上行带宽授权。
第二DBA调度模块212，用于生成包含第二上行发送时隙以及注册时隙的第二上行带宽授权。
其中，第一上行发送时隙用于指示已注册的ONU在第一上行通道上发送第一上行业务数据，第二上行发送时隙用于指示已注册的ONU在第二上行通道上发送第二上行业务数据，注册时隙用于指示未注册的ONU在第二上行通道上发送注册响应报文，第一上行业务数据的延时需求高于第二上行业务数据的延时需求。
可选的，第一上行业务数据的延时低于第二上行业务数据的延时，即ONU通过第一上行通道发送低延时业务对应的上行业务数据，通过第二上行通道进行新增ONU注册以及发送高延时业务对应的上行业务数据。
需要说明的是，当未注册的ONU根据第二上行带宽授权中的注册时隙发送注册响应报文时，已注册的ONU需要停止在第二上行通道上发送第二上行业务数据，避免第二上行业务数据与注册响应报文在第二上行通道上产生冲突。
显而易见的，本实施例中，在确保低延时业务不受ONU注册过程影响的同时，PON系统能够利用双上行通道进行上行业务数据发送，提高了整个PON系统中上行业务数据的传输速率。
上述实施例中，以OLT中设置有两个DBA调度模块为例进行说明；在另一种可能的实施方式中，OLT中可以仅设置一个DBA调度模块，OLT即通过该DBA调度模块控制第一上行通道和第二上行通道的上行数据发送。在图2所示OLT的基础上，如图4所示，OLT中包括DBA调度模块210以及控制模块290。
控制模块290与DBA调度模块210相连，用于控制DBA调度模块210开启或关闭注册功能。
可选的，控制模块290每隔预定时间间隔控制DBA调度模块210开启注册功能，并在注册功能开启时长达到预设时长时，控制DBA调度模块210关闭注册功能。
在开启注册功能时，DBA调度模块210生成包含第一上行发送时隙的第一上行带宽授权以及包含注册时隙的第二上行带宽授权。
相应的，PON系统中各个ONU接收到第一上行带宽授权和第二上行带宽 授权后，已注册的ONU即根据第一上行带宽授权中包含的第一上行发送时隙，通过第一上行通道发送第一上行业务数据；未注册的ONU即根据第二上行带宽授权中包含的注册时隙，通过第二上行通道发送注册响应报文并完成注册激活。
在关闭注册功能，且第二上行通道被配置为仅传输注册响应报文时，DBA调度模块210生成包含第一上行发送时隙的第一上行带宽授权，指示系统中已注册的ONU通过第一上行通道发送上行业务数据；
在关闭注册功能，且第二上行通道被配置为传输注册响应报文和第二上行业务数据时，DBA调度模块210生成包含第一上行发送时隙的第一上行带宽授权以及包含第二上行发送时隙的第二上行带宽授权，指示系统中已注册的ONU通过第一上行通道发送第一上行业务数据，通过第二上行通道发送第二上行业务数据。
由于第一上行通道和第二上行通道上的上行数据是突发发送的，为了使OLT知悉上行数据何时到达，以便OLT中的上行突发接收机在上行数据到达前做好数据接收准备，可选的，如图4所示，该OLT中还包括存储器280，其中，该存储器280与DBA调度模块210相连，且该存储器280还分别与下行TC模块220以及上行TC模块230相连。
存储器280获取到DBA调度模块210生成的上行带宽授权后，将该上行带宽授权复制成两份，一份发送给下行TC模块220，由下行TC模块220通过下行成帧汇聚生成包含该上行带宽授权的下行数据，并最终将该下行数据发送给ONU；另一份则存储起来，并发送给上行TC模块230，由上行TC模块230根据该上行带宽授权控制第一上行突发接收机251接收ONU在第一上行通道上突发发送的上行数据，控制第二上行突发接收机252接收ONU在第二上行通道上突发发送的上行数据。
可选的，上行TC模块230获取上行带宽授权后，在上行数据到达之前分别对第一上行突发接收机251以及第二上行突发发射机252进行复位，以便指示第一上行突发接收机251开始接收ONU在第一上行通道上传输的上行数据，指示第二上行突发接收机252开始接收ONU在第二上行通道上传输的上行数据。
进一步地，上行TC模块230还可以根据上行带宽授权识别出第一上行通道上传输上行数据的ONU以及在第二上行通道上传输上行数据的ONU，以便 实现对上行数据的进一步转发。
进一步的，上行TC模块230还可以根据上行带宽授权对ONU发送的上行数据进行鉴权，从而判断PON系统中是否存在非法接入的ONU。比如，若上行TC模块230在上行带宽授权所指示上行发送时隙之外检测到上行数据，则确定PON系统中存在非法接入的ONU；又比如，上行TC模块230接收到上行数据后，根据发送方(发送上行数据的ONU)发送上行数据的上行发送时隙，在上行带宽授权中查找对应的ONU标识，若查找到的ONU标识与发送方的ONU标识不一致，则确定PON系统中存在非法接入的ONU，其中，该ONU标识为OLT分配的LLID或ONU ID。对于未通过鉴权的上行数据，OLT直接对其进行过滤，对于通过鉴权的上行数据，OLT则进一步对该上行数据进行解析，从而获得上行数据中包含的业务信息。
本实施例中，利用存储器向上行TC模块提供上行带宽授权，使得上行TC模块能够根据该上行带宽授权控制上行突发接收机接收上行数据，提高了上行数据接收的准确性；同时，上行TC模块还可以利用该上行带宽授权对接收到的上行数据进行鉴权，从而避免非法接入的ONU对PON系统造成影响。
请参考图5，其示出了本申请一个实施例提供的ONU的结构示意图。本实施例以该ONU用于图1所示PON系统为例进行说明。该ONU包括：下行TC模块510、至少一个DBA响应模块520、上行TC模块530、下行接收机540、第一上行突发发射机551和第二上行突发发射机552。
下行接收机540用于在下行通道上接收OLT(以广播形式)发送的下行数据，其中，该下行数据以光载波信号的形式在下行通道中传输。
该下行数据中包含用于控制ONU发送上行数据的上行带宽授权。可选的，当该ONU用于GPON系统时，OLT发送BWmap消息中携带该上行带宽授权；当该ONU用于EPON系统时，OLT发送的Gate消息中携带该上行带宽授权。
可选的，该下行数据中还包括ONU请求获取的下行业务数据，比如ONU请求获取的视频数据、语音数据等等。
下行接收机540获取到下行数据后，向相连的下行TC模块510提供该下行数据。
在一种可能的实施方式中，下行TC模块510获取到下行数据后，还原出下行数据中包含的上行带宽授权和下行业务数据，向相连的终端设备提供该下 行业务数据，并向相连的DBA响应模块520提供识别出的上行带宽授权。
DBA响应模块520与上述实施例中OLT的DBA调度模块相对应，用于根据获取得到的上行带宽授权控制ONU通过上行通道发送上行数据。
如图5所示，DBA响应模块520还与上行TC模块530相连，用于根据下行数据中包含的上行带宽授权控制上行TC模块530发送上行数据。
与现有技术中ONU仅通过一条上行通道发送上行数据不同的是，本实施例中，ONU通过两条上行通道向OLT发送上行数据。
可选的，下行数据中包含第一上行带宽授权和第二上行带宽授权，DBA响应模块520即根据第一上行带宽授权控制上行TC模块530通过第一上行通道发送上行数据，根据第二上行带宽授权控制上行TC模块530通过第二上行通道发送上行数据。
可选的，上行TC模块530还用于接收各个DBA响应模块520发送的上行带宽请求，并通过DBA响应模块520对应的上行通道进行上行带宽请求上报，其中，该上行带宽请求是DBA响应模块520对发送队列中数据包进行收集统计后得到的。
为了实现双通道发送上行数据，上行TC模块530分别与第一上行突发发射机551以及第二上行突发发射机552相连，从而通过第一上行突发发射机551在第一上行通道上发送上行数据，通过第二上行突发发射机552在第二上行通道上发送上行数据。
可选的，当上行TC模块530需要通过第一上行通道发送上行数据时，即向第一上行通道对应的第一上行突发发射机551发送使能信号，触发第一上行突发发射机551发送上行数据；当上行TC模块530需要通过第二上行通道发送上行数据时，即向第二上行通道对应的第二上行突发发射机552发送使能信号，触发第二上行突发发射机552发送上行数据。
本实施例中，第一上行通道关闭注册功能，第二上行通道开启注册功能，且第一上行通道和第二上行通道注册功能的开闭由OLT控制。
由于仅有开启注册功能的上行通道才能够进行注册响应报文传输，且不同上行通道之间不会产生冲突，因此，可选的，ONU选择关闭注册功能的第一上行通道传输上行业务数据，选择开启注册功能的第二上行通道传输注册响应报文；或者，ONU根据业务的延时需求，选择关闭注册功能的第一上行通道传输低延时业务(对延时要求较高的业务)对应的上行业务数据，选择开启注 册功能的第二上行通道传输注册响应报文以及高延时业务(对延时要求较低的业务)对应的上行业务数据。
显而易见的，通过设置双上行通道，并配置第一上行通道关闭注册功能，配置第二上行通道开启注册功能，使得PON系统中未注册的ONU通过第二上行通道发送注册响应报文时，已注册的ONU仍能够通过第一上行通道发送上行业务数据，避免了ONU注册对业务上行数据发送所产生的影响，从而满足低延时业务对系统时延的需求。
需要说明的是，由于下行通道、第一上行通道和第二上行通道采用波分复用的方式共用同一个ODN，且第一上行通道和第二上行通道的波长互不相同，因此，该ONU中还设置有合/分波器560，用于对上下行通道中的光载波信号进行聚合或分离。
在一种可能的实施方式中，OLT通过下行通道发送的上行带宽授权由第一上行带宽授权和第二上行带宽授权复用得到，相应的，ONU接收到该上行带宽授权后，需要对该上行带宽授权进行解复用，从而根据解复用得到的第一上行带宽授权和第二上行带宽授权在相应的上行通道上发送上行数据。基于图5所示的ONU，如图6所示，该ONU中包括第一DBA响应模块521、第二DBA响应模块522和解复用模块570。
解复用模块570与上述实施例中OLT的复用模块相对应，用于获取下行TC模块510接收到的上行带宽授权，并对该上行带宽授权进行解复用，从而得到第一上行带宽授权以及第二上行带宽授权。
进一步的，该解复用模块570还与第一DBA响应模块521和第二DBA响应模块522相连，用于向第一DBA响应模块521提供解复用得到的第一上行带宽授权，向第二DBA响应模块522提供解复用得到的第二上行带宽授权。
可选的，解复用模块570根据(复用后)上行带宽授权中包含的上行通道标识，解复用得到第一上行带宽授权和第二上行带宽授权，其中，第一上行带宽授权与第一上行通道的上行通道标识对应，第二上行带宽授权与第二上行通道的上行通道标识对应；进一步的，解复用模块670将第一、第二上行带宽授权发送至对应的DBA响应模块。
如图6所示，第一DBA响应模块521与解复用模块570相连，用于根据第一上行带宽授权控制上行TC模块530通过第一上行通道发送上行数据；
第二DBA响应模块522与解复用模块570相连，用于根据第二上行带宽授权控制上行TC模块530通过第二上行通道发送上行数据。
在一种可能的实施方式中，关闭注册功能的第一上行通道仅用于传输上行业务数据，而开启注册功能的第二上行通道仅用于传输注册响应报文。
对于PON系统中处于已注册状态的ONU，该ONU中的上行TC模块530根据第一上行带宽授权中的上行发送时隙，向第一上行突发发射机551发送第一使能信号，触发第一上行突发发射机551通过第一上行通道向OLT发送上行业务数据；
对于PON系统中处于未注册状态的ONU，该ONU中的上行TC模块530根据第二上行带宽授权中的注册时隙，向第二上行突发发射机552发送第二使能信号，触发第二上行突发发射机552通过第二上行通道向OLT发送注册响应报文。
换句话讲，当关闭注册功能的第一上行通道仅用于传输上行业务数据，开启注册功能的第二上行通道仅用于传输注册响应报文时，PON系统中已注册的ONU均通过第一上行通道向OLT发送上行业务数据，未注册的ONU均通过第二上行通道向OLT发送注册响应报文，上行业务数据与注册响应报文在不同的上行通道传输，避免ONU注册过程对上行业务数据发送过程造成影响。
在另一种可能的实施方式中，关闭注册功能的第一上行通道用于传输第一上行业务数据，而开启注册功能的第二上行通道用于传输注册响应报文及第二上行业务数据。
对于PON系统中处于已注册状态的ONU，该ONU中的上行TC模块530根据第一上行带宽授权中的第一上行发送时隙，向第一上行突发发射机551发送第三使能信号，从而触发第一上行突发发射机551通过第一上行通道发送第一上行业务数据；与此同时，上行TC模块530根据第二上行带宽授权中的第二上行发送时隙，向第二上行突发发射机552发送第四使能信号，从而触发第二上行突发发射机552通过第二上行通道发送第二上行业务数据，其中，第一上行业务数据的延时需求高于第二上行业务数据的延时需求。
对于PON系统中处于未注册状态的ONU，该ONU中的上行TC模块530根据第二上行带宽授权中的注册时隙，向第二上行突发发射机552发送第二使能信号，从而触发第二上行突发发射机552通过第二上行通道发送注册响应报文。需要说明的是，当未注册的ONU通过第二上行通道发送注册响应报文时， 已注册的ONU需要停止通过第二上行通道发送第二上行业务数据，从而避免第二上行通道上注册响应报文与第二上行业务数据产生冲突。简单来讲，本实施例中，第一上行通道用于传输低延时业务的上行业务数据，第二上行通道用于进行ONU注册的同时，还用于传输高延时业务的上行业务数据，在确保ONU注册不会对低延时业务产生影响的前提下，同时利用两个上行通道进行上行业务数据传输，进一步提高了PON系统中上行业务数据的传输速率。
需要说明的是，上述实施例仅以第一DBA响应模块521和第二DBA响应模块522连接到同一上行TC模块530为例进行说明，在其他可能的实施方式中，该上行TC模块530可以被拆分为两个子上行TC模块，且第一DBA响应模块521和第二DBA响应模块522与各自对应的子上行TC模块相连，并通过子上行TC模块进行上行数据发送，本实施例并不对此进行限定。
上述实施例中，以ONU中包括两个DBA响应模块为例进行说明，在其他可能的实施方式中，在图5所示ONU的基础上，如图7所示，该ONU中包括一个DBA响应模块520以及通道选择模块580。
DBA响应模块520与下行TC模块510相连，用于根据接收到的第一上行带宽授权控制上行TC模块530发送上行业务数据，或，根据接收到第二上行带宽授权控制上行TC模块530发送注册响应报文。
通道选择模块580的一端与上行TC模块530相连，通道选择模块580的另一端分别于第一上行突发发射机551和第二上行突发发射机552相连。通道选择模块580通过上行TC模块630获取待发送的上行数据(上行业务数据或注册响应报文)后，进一步根据ONU所处的注册状态确定选择通过哪一个上行突发发射机进行上行数据发送。
当ONU处于已注册状态时，通道选择模块580选择第一上行突发发射机551发送上行TC模块530成帧汇聚的上行业务数据；当ONU处于未注册状态时，通道选择模块580选择第二上行突发发射机552发送上行TC模块530生成的注册响应报文。
本实施例中，ONU中的通道选择模块根据ONU所处的注册状态，在ONU处于已注册状态时，关闭第二上行突发发射机(即关闭自身的第二上行通道)，并通过开启的第一上行突发发射机在第一上行通道上发送上行业务数据；在ONU处于未注册状态时，关闭第一上行突发发射机(即关闭自身的第一上行 通道)，并通过开启第二上行突发发射机在第二上行通道上发送注册响应报文，实现了ONU的动态节能。
当ONU需要同时发送低延时业务以及高延时业务的上行业务数据时，为了避免ONU注册对低延时业务造成影响，ONU需要对低延时业务数据上行过程和ONU注册过程进行分离。在一种可能的实施方式中，基于图6所示的ONU，如图8所示，该ONU中还包括业务分类模块590。
业务分类模块590根据预先设置的分类标准对上层业务进行分类，将上层业务划分为第一分类和第二分类，其中，属于第一分类的业务的延时需求高于属于第二分类的业务的延时需求。
可选地，业务分类模块590，用于收集各个业务的延时需求，并根据延时需求确定各个业务所属的业务分类。
进一步的，业务分类模块590根据各个业务所属的业务分类，选择相应的DBA响应模块(对应上行通道)发送业务对应的上行业务数据。
由于高延时业务对延时不敏感，即ONU注册不会对高延时业务造成影响，因此，当业务分类指示业务属于第一分类(即该业务为低延时业务)时，业务分类模块590将该业务交由第一DBA响应模块521处理，第一DBA响应模块521即控制上行TC模块530通过关闭注册功能的第一上行通道发送该业务对应的第一上行业务数据；在业务分类指示业务属于第二分类(即该业务为高延时业务)时，业务分类模块590将该业务交由第二DBA响应模块522处理，第二DBA响应模块522即控制上行TC模块530通过开启注册功能的第二上行通道发送该业务对应的第二上行业务数据。
可选的，对于通过同一上行通道发送的上行数据，ONU还可以进一步根据业务的优先级对业务进行排序，并优先发送高优先级业务对应的上行数据，本实施例并不对此进行限定。
本实施例中，ONU通过业务分类模块对业务进行分类，并选择关闭注册功能的第一上行通道发送低延时业务对应的上行数据，选择开启注册功能的第二上行通道发送高延时业务对应的上行数据，确保低延时业务不受ONU注册的影响，满足低延时业务对系统时延的需求。
图5至图8所示的ONU中，第一上行突发发射机551和第二上行突发发 射机552均固设在ONU中，但是实际使用过程中，第二上行突发发射机552仅在进行注册或在需要发送第二上行业务数据时才会工作，导致第二上行突发发射机552的利用率较低。为了降低整个ONU的制造成本，基于图5所示的ONU，在一种可能的实施方式中，如图9所示，ONU中包括光模块槽位910，该光模块槽位910用于插入第一光模块911或第二光模块912。
其中，第一光模块911中至少包括下行接收机540和第一上行突发发射机551，第二光模块912中至少包括下行接收机540和第二上行突发接收机551；即当第一光模块911插入光模块槽位910时，第一光模块911即通过下行接收机540在下行通道上接收下行数据，并通过第一上行突发发射机551在第一上行通道上发送上行数据；当第二光模块912插入光模块槽位910时，第二光模块912即通过下行通道接收下行数据，并通过第二上行突发发射机552在第二上行通道上发送上行数据。由于第一上行通道关闭注册功能，第二上行通道开启注册功能，因此，对于PON系统中未注册的ONU，通过将第二光模块912插入光模块槽位910中，使得未注册的ONU通过下行通道接收到包含注册时隙的下行数据后，能够通过第二光模块912中的第二上行突发发射机552向OLT发送注册响应报文，从而完成注册激活；当ONU完成注册后，将第二光模块912拔出，并将第一光模块911插入光模块槽位910，使得已注册的ONU通过下行通道接收到包含上行发送时隙的下行数据后，能够通过第一光模块911中的第一上行突发发射机551向OLT发送上行业务数据。
需要说明的是，将第二光模块912拔出后，将第一光模块911插入光模块槽位910前，ONU可能因一段时间内未接收到OLT发送的下行数据而失步，导致该ONU从正常工作状态中退出。为了使ONU恢复正常工作状态，当第二光模块911插入光模块槽位910后，OLT通过下行通道将注册信息下发给该ONU，以便ONU根据该注册信息恢复到正常工作状态。
显然，安装人员在安装ONU时，只需要在ONU注册阶段利用第二光模块920进行ONU注册，并在完成ONU注册后将第一光模块910插入ONU，即可完成ONU安装；且安装人员能够利用同一第二光模块920完成不同ONU安装，从而降低了ONU的制造成本。
在其他可能的实施方式中，合/分波器560、下行TC模块510、DBA响应模块520、上行TC模块530和第二光模块912还可以构成专门用于注册的ONU注册设备，且该ONU注册设备的SN或MAC地址被设置为可修改。当新增 ONU(包括第一光模块910)需要进行注册时，ONU注册设备获取该新增ONU的SN或MAC地址，并接入PON系统中。当ONU注册设备接收到OLT通过下行通道发送的下行数据时，即根据下行数据中包含的注册时隙，通过第二上行通道发送注册响应报文(包含新增ONU的SN或MAC地址)，从而完成注册激活；当ONU注册设备根据新增ONU的SN或MAC地址完成注册后，将该ONU注册设备移除，并将新增ONU接入PON系统中。由于ONU注册设备已利用新增ONU的SN或MAC地址进行了注册，因此，新增ONU接入PON系统时便完成了注册，并能够通过第一光模块910中的第一上行突发发射机551发送上行业务数据。
需要说明的是，将ONU注册设备移除，并将新增ONU接入PON系统后，新增ONU可能还处于初始状态，为了使新增ONU正常工作，OLT通过下行通道将注册信息下发给该ONU，以便ONU根据该注册信息恢复到正常工作状态。
本实施例中，通过将下行接收机和第一上行突发发射机集成到第一光模块中，将下行接收机和第二上行突发发射机集成到第二光模块中，使得不同的新增ONU均能够使用同一第二光模块完成ONU注册，从而提高了第二上行突发发射机的利用率，降低了ONU的制造成本。
图9所示的ONU中，第二上行通道仅用于进行ONU注册，而所有的上行业务数据均通过第一上行通道传输，当上行业务数据的数据量较大时，第一上行通道的传输压力过大，将对低延时业务产生影响。为了减轻单上行通道的传输压力，在图5所示ONU的基础上，如图10所示，该ONU中包括第一光模块槽位1011和第二光模块槽位1012，第一光模块槽位1011用于插入第一光模块1021，第二光模块槽位1012用于插入第二光模块1022。
其中，第一光模块1021中至少包括第一上行突发发射机551，第二光模块1022中至少包括下行接收机540和第二上行突发发射机552。
对于新增的ONU，通过将第二光模块1022插入第二光模块槽位1012，并将该ONU接入PON系统，ONU即可通过第二光模块1022中的下行接收机540接收下行数据，并根据下行数据中包含的注册时隙在第二上行通道上完成注册激活。当ONU仅用于传输高延时业务的上行业务数据时，ONU利用第二上行通道完成注册后，进一步利用该第二上行通道发送上行业务数据。由于高 延时业务对延时不敏感，因此，即使新增ONU利用第二上行通道进行设备注册也不会对已注册的ONU造成较大影响。
而当ONU需要传输低延时业务的上行业务数据时，为了避免ONU注册对低延时业务造成影响，需要将第一光模块1022插入第一光模块槽位1011中。当第一光模块1022插入ONU后，ONU即通过第二光模块1022中的第二上行突发发射机552传输高延时业务对应的第二上行业务数据，通过第一光模块1021中的第一上行突发发射机551传输低延时业务对应的第一上行业务数据，从而达到上行业务数据分流的效果。同时，由于新增ONU通过第二上行通道进行注册，因此ONU注册不会对第一上行通道中上行业务数据传输造成影响。
需要说明的是，图9和10所示的光模块中，当光模块中同时包含上行突发发射机和下行接收机时，光模块中还需要包含合/分波器，从而对接收到的光载波信号进行聚合或分离，本申请实施例并不对此进行限定。
请参考图11，其示出了本申请一个实施例提供的PON系统中数据交互过程的流程图。该PON系统中包括：OLT和至少两个ONU，OLT与各个ONU之间通过ODN相连，且OLT与至少两个ONU之间通过ODN中的一条下行通道和两条上行通道进行数据交互。
步骤1110，OLT通过下行通道向各个ONU发送下行数据，下行数据中包括上行带宽授权，上行带宽授权用于控制ONU发送上行数据。
可选的，该上行带宽授权由OLT中的至少一个DBA调度模块生成。
可选的，该下行数据中包括第一上行带宽授权和第二上行带宽授权，第一上行带宽授权用于控制ONU在第一上行通道上发送上行数据，第二上行带宽授权用于控制ONU在第二上行通道上发送上行数据，且ONU发送的上行数据包括上行业务数据或注册响应报文。
可选的，若该PON系统为GPON系统，携带该上行带宽授权的消息为BWMAP消息；若该PON系统为EPON系统，携带该上行带宽授权的消息为Gate消息。
步骤1120，ONU通过下行通道接收下行数据。
对应的，PON系统中各个ONU通过下行通道接收OLT以广播形式发送的下行数据。
步骤1130，ONU根据下行数据中包含的上行带宽授权，通过第一上行通 道或第二上行通道发送上行数据。
ONU进一步获取该下行数据中包含的上行带宽授权，并根据自身所处的注册状态，通过第一上行通道或第二上行通道向OLT发送上行数据。其中，第一上行通道关闭注册功能，第二上行通道开启注册功能，且注册功能用于对未注册的ONU进行注册。
可选的，当ONU处于未注册状态，且获取到的上行带宽授权中包含注册时隙时，ONU即在该注册时隙内通过开启注册功能的第二上行通道向OLT发送注册响应报文。
可选的，当ONU处于已注册状态，且获取到的上行带宽授权中包含上行发送时隙时，ONU在该上行发送时隙内通过关闭注册功能的第一上行通道向OLT发送上行业务数据；或，ONU在该上行发送时隙内通过第一上行通道及第二上行通道同时向OLT发送上行业务数据。
本实施例中，ONU根据OLT生成的上行带宽授权，将上行业务数据发送以及ONU注册划分至不同的上行通道，从而避免ONU注册对上行业务数据发送所产生的影响，满足低延时业务对系统时延的需求。
需要说明的是，下行通道、第一上行通道和第二上行通道采用波分复用的方式共用同一ODN，且第一上行通道与第二上行通道的波长不同，从而避免第一上行通道与第二上行通道之间产生干扰。
步骤1140，OLT通过第一上行通道和第二上行通道接收各个ONU发送的上行数据。
相应的，OLT通过第一上行通道和第二上行通道接收各个ONU发送的上行数据，其中，该上行数据包括通过第二上行通道发送的注册响应报文、通过第一和/或第二上行通道发送的上行业务数据。
可选的，当OLT接收到已注册的ONU发送的上行业务数据时，OLT对该上行业务数据进行解析，并进一步通过下行通道向ONU反馈相应的下行数据；当OLT接收到未注册的ONU发送的注册响应报文时，OLT则对未注册的ONU进行注册。
在一种可能的实施方式中，OLT通过下行通道发送的下行数据中包含第一上行带宽授权和第二上行带宽授权，ONU接收到下行数据后，即根据第一上行带宽授权通过第一上行通道向OLT发送上行数据，和/或，根据第二上行带 宽授权通过第二上行通道向OLT发送上行数据，下面采用示意性的实施例进行说明。
请参考图12，其示出了本申请另一个实施例提供的PON系统中数据交互过程的流程图。
步骤1201，OLT生成第一上行带宽授权和第二上行带宽授权。
本实施例中，PON系统中的第一上行通道关闭注册功能，第二上行通道开启注册功能，即PON系统中未注册的ONU在第二上行通道完成注册激活。相应的，OLT生成的第一上行带宽授权用于指示已注册的ONU通过第一上行通道发送上行业务数据，OLT生成的第二上行带宽授权用于指示未注册的ONU在注册周期内通过第二上行通道发送注册响应报文，或，第二上行带宽授权用于指示已注册的ONU在非注册周期内通过第二上行通道发送上行业务数据。
可选的，OLT中包括第一DBA调度模块和第二DBA调度模块，并通过第一DBA调度模块生成第一上行带宽授权，通过第二DBA调度模块生成第二上行带宽授权。
在一种可能的实施方式中，当第一上行通道被配置为仅用于传输上行业务数据，第二上行通道被配置为仅用于传输注册响应报文时，OLT生成包含上行发送时隙的第一上行带宽授权，生成包含注册时隙的第二上行带宽授权。该第一上行带宽授权即用于指示PON系统中已注册的ONU通过第一上行通道，在该上行发送时隙内发送上行业务数据；该第二上行带宽授权即用于指示PON系统中未注册的ONU通过第二上行通道，在该注册时隙内发送注册响应报文。
在另一种可能的实施方式中，当第一上行通道被配置为用于传输第一上行业务数据，第二上行通道被配置为用于传输注册响应报文及第二上行业务数据时，OLT生成包含第一上行发送时隙的第一上行带宽授权，生成包含第二上行发送时隙以及注册时隙的第二上行带宽授权。该第一带宽授权即用于指示PON系统中已注册的ONU通过第一上行通道，在该第一上行发送时隙内发送第一上行业务数据；该第二带宽授权即用于指示已注册的ONU在非注册周期内(即非静默开窗期内)，(根据第二上行发送时隙)通过第二上行通道发送第二上行业务数据，或，该第二带宽授权用于指示未注册的ONU在注册周期内，(根据注册时隙)通过第二上行通道发送注册响应报文。其中，第一上行业务数据的延时需求高于第二上行业务数据的延时需求。
需要说明的是，第一上行通道和第二上行通道注册功能的开闭由OLT灵 活配置，即OLT可以配置第一上行通道开启注册功能，配置第二上行通道关闭注册功能；OLT也可以配置第一上行通道关闭注册功能，配置第二上行通道开启注册功能。本申请实施例仅以第一上行通道关闭注册功能，第二上行通道开启注册功能为例进行示意性说明，但并不对此进行限定。
可选的，OLT每隔预定时长获取第一上行通道和第二上行通道的通道传输质量；当第一上行通道的通道传输质量优于第二上行通道的通道传输质量时，OLT控制第一上行通道关闭注册功能，控制第二上行通道开启注册功能；当第二上行通道的通道传输质量优于第一上行通道的通道传输质量时，OLT控制第二上行通道关闭注册功能，控制第一上行通道开启注册功能。
可选的，由于第一上行通道和第二上行通道上的上行数据是突发发送的，为了使OLT知悉上行数据何时到达，以便OLT中的上行突发接收机在上行数据到达前做好数据接收准备，OLT存储生成的第一上行带宽授权和第二上行带宽授权，并根据第一上行带宽授权和第二上行带宽授权控制响应的上行突发接收机接收上行数据。
步骤1202，OLT对第一上行带宽授权和第二上行带宽授权进行复用，得到复用后的上行带宽授权。
可选的，该OLT中设置有复用模块，OLT生成的上行带宽授权即通过该复用模块进行复用汇聚。
由于第一及第二上行带宽授权经过复用后通过同一下行通道发送给ONU，为了使ONU能够识别出第一及第二上行带宽授权，并确定不同上行带宽授权所对应的上行通道，在对第一上行带宽授权和第二上行带宽授权进行复用的过程中，OLT需要在第一及第二上行带宽授权中添加相应的上行通道标识，然后对添加上行通道标识后的上行带宽授权进行复用。可选的，OLT也可以直接生成携带有上行通道标识的第一及第二上行带宽授权，本申请实施例并不对此进行限定。
在一种可能的实施方式中，当OLT用于GPON系统时，OLT分别在第一BWmap消息(即携带第一上行带宽授权的消息)和第二BWmap消息(即携带第二上行带宽授权的消息)中添加上行通道标识。
在一种可能的实施方式中，当OLT用于EPON系统时，OLT分别在第一Gate消息(即携带第一上行带宽授权的消息)和第二Gate消息(即携带第二上行带宽授权的消息)中添加上行通道标识。
步骤1203，OLT通过下行通道向各个ONU发送下行数据，下行数据中包括复用后的上行带宽授权。
可选的，OLT进行上层业务适配、GEM封装、TC成帧以及物理层适配后，生成该下行数据，并控制内置的下行发射机在下行通道上发送该下行数据。其中，上层业务适配包括用户数据适配、OMCI适配等等。
步骤1204，ONU通过下行通道接收下行数据。
对应的，PON系统中各个ONU通过下行通道接收OLT以广播形式发送的下行数据。
步骤1205，ONU对接收到的上行带宽授权进行解复用，得到第一上行带宽授权和第二上行带宽授权。
ONU接收到下行数据后，获取下行数据中包含的复用后的上行带宽授权，并对该上行带宽授权进行解复用，从而得到第一上行带宽授权和第二上行带宽授权。
可选的，ONU获取复用后的上行带宽授权，并根据该上行带宽授权中包含的上行通道标识对其进行解复用，从而得到用于控制第一上行通道的第一上行带宽授权以及用于控制第二上行通道的第二上行带宽授权。
步骤1206，ONU根据第一上行带宽授权在第一上行通道上发送上行数据，和/或，根据第二上行带宽授权在第二上行通道上发送上行数据。
在一种可能的实施方式中，当第一上行通道用于传输上行业务数据，第二上行通道仅用于传输注册响应报文时，已注册的ONU即根据第一上行带宽授权中包含的上行发送时隙，通过第一上行通道发送上行业务数据；未注册的ONU即根据第二上行带宽授权中包含的注册时隙，通过第二上行通道发送注册响应报文。
在另一种可能的实施方式中，当第一上行通道用于传输第一上行业务数据，第二上行通道用于传输注册响应报文及第二上行业务数据时，已注册的ONU即根据第一上行带宽授权中包含的第一上行发送时隙，通过第一上行通道发送第一上行业务数据，同时，ONU根据第二上行带宽授权中包含的第二上行发送时隙，通过第二上行通道发送第二上行业务数据；未注册的ONU即根据第二上行带宽授权中的注册时隙，通过第二上行通道向OLT发送注册响应报文，已完成注册激活。
由于同一ONU需要执行多种业务，且不同业务的延时需求各不相同，为 了确保PON系统满足低延时业务的延时需求，可选的，已注册的ONU通过双上行通道发送上行数据前，收集各个上层业务的延时需求，并根据各个业务的延时需求确定各个业务所属的业务分类，当业务分类指示业务属于第一分类时，ONU确定通过第一上行通道发送该业务对应的上行数据；当业务分类指示业务属于第二分类时，ONU确定通过第二上行通道发送该业务对应的上行数据。
需要说明的是，对于通过同一上行通道发送的上行数据，ONU还可以进一步根据业务的优先级对业务进行排序，并优先发送高优先级业务对应的上行数据，本实施例并不对此进行限定。
步骤1207，OLT通过第一上行通道和第二上行通道接收各个ONU发送的上行数据。
可选的，OLT上设置有第一上行突发接收机和第二上行突发接收机，OLT即通过第一上行突发接收机从第一上行通道处接收已注册的ONU发送的上行业务数据，通过第二上行突发接收机从第二上行通道处接收已注册的ONU发送的上行业务数据或未注册的ONU发送的注册响应报文。
可选的，当OLT中存储有生成的上行带宽授权时，OLT在上行数据到达之前对内置的上行突发接收机进行复位，以便指示上行突发接收机开始接收ONU在第一及第二上行通道上传输的上行数据。
可选的，OLT还可以根据上行带宽授权识别出第一上行通道上传输上行数据的ONU以及在第二上行通道上传输上行数据的ONU，以便实现对上行数据的进一步转发。
可选的，OLT还可以根据上行带宽授权对ONU发送的上行数据进行鉴权，从而判断PON系统中是否存在非法接入的ONU。比如，若OLT在上行带宽授权所指示上行发送时隙之外检测到上行数据，则确定PON系统中存在非法接入的ONU；又比如，OLT接收到上行数据后，根据发送方(发送上行数据的ONU)发送上行数据的上行发送时隙，在上行带宽授权中查找对应的ONU标识，若查找到的ONU标识与发送方的ONU标识不一致，则确定PON系统中存在非法接入的ONU，其中，该ONU标识为OLT分配的LLID或ONU ID。对于未通过鉴权的上行数据，OLT直接对其进行过滤，对于通过鉴权的上行数据，OLT则进一步对该上行数据进行解析，从而获得上行数据中包含的业务信息。
本实施例中，OLT生成分别用于控制第一上行通道和第二上行通道的第一上行带宽授权和第二上行带宽授权，并对该第一上行带宽授权和第二上行带宽授权进行复用，从而通过下行通道向各个ONU提供复用后的上行带宽授权，使得ONU能够根据接收到的上行带宽授权分别对第一上行通道和第二上行通道的数据发送进行控制，确保上行数据通过第一上行通道和第二上行通道有序达到OLT，避免上行数据之间产生冲突。
本实施例中，OLT利用生成的上行带宽授权控制上行突发接收机接收上行数据，提高了上行数据接收的准确性；同时，OLT利用该上行带宽授权对接收到的上行数据进行鉴权，从而避免非法接入的ONU对PON系统造成影响。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的具体实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (34)

  1. 一种无源光网络PON系统，其特征在于，所述系统包括：光线路终端OLT和至少两个光网络单元ONU，所述OLT与各个所述ONU之间通过光分配网络ODN相连，且所述OLT与所述至少两个ONU之间通过一条下行通道和两条上行通道进行数据交互；
    所述OLT通过所述下行通道向各个所述ONU发送下行数据，所述下行数据中包括上行带宽授权，所述上行带宽授权用于控制所述ONU发送上行数据；
    所述ONU通过所述下行通道接收所述下行数据；根据所述下行数据中包含的所述上行带宽授权，通过第一上行通道或第二上行通道发送上行数据；
    所述OLT通过所述第一上行通道和所述第二上行通道接收各个所述ONU发送的上行数据；
    其中，所述第一上行通道关闭注册功能，所述第二上行通道开启注册功能，所述注册功能用于对未注册的所述ONU进行注册。
  2. 根据权利要求1所述的系统，其特征在于，所述下行数据中包含第一上行带宽授权和第二上行带宽授权，所述第一上行带宽授权用于控制所述ONU在所述第一上行通道上发送上行数据，所述第二上行带宽授权用于控制所述ONU在所述第二上行通道上发送上行数据。
  3. 根据权利要求2所述的系统，其特征在于，
    所述OLT生成所述第一上行带宽授权和所述第二上行带宽授权；对所述第一上行带宽授权和所述第二上行带宽授权进行复用，得到复用后的上行带宽授权；
    所述ONU对接收到的所述上行带宽授权进行解复用，得到所述第一上行带宽授权和所述第二上行带宽；根据所述第一上行带宽授权在所述第一上行通道上发送上行数据；根据所述第二上行带宽授权在所述第二上行通道上发送上行数据。
  4. 根据权利要求2或3所述的系统，其特征在于，所述第一上行通道用于传输上行业务数据，所述第二上行通道用于传输注册响应报文；
    所述OLT生成包含上行发送时隙的所述第一上行带宽授权；生成包含注册时隙的所述第二上行带宽授权；
    所述ONU处于已注册状态时，根据所述第一上行带宽授权中的所述上行发送时隙，通过所述第一上行通道向所述OLT发送所述上行业务数据；
    或，
    所述ONU处于未注册状态时，根据所述第二上行带宽授权中的所述注册时隙，通过所述第二上行通道向所述OLT发送注册响应报文。
  5. 根据权利要求2或3所述的系统，其特征在于，所述第一上行通道用于传输第一上行业务数据，所述第二上行通道用于传输注册响应报文及第二上行业务数据，所述第一上行业务数据的时延需求高于所述第二上行业务数据的时延需求；
    所述OLT生成包含第一上行发送时隙的所述第一上行带宽授权；生成包含第二上行发送时隙以及注册时隙的所述第二上行带宽授权；
    所述ONU处于已注册状态时，根据所述第一上行带宽授权中的所述第一上行发送时隙，通过所述第一上行通道向所述OLT发送所述第一上行业务数据；根据所述第二上行带宽授权中的所述第二上行发送时隙，通过所述第二上行通道向所述OLT发送所述第二上行业务数据；
    或，
    所述ONU处于未注册状态时，根据所述第二上行带宽授权中的所述注册时隙，通过所述第二上行通道向所述OLT发送注册响应报文。
  6. 根据权利要求1至5任一所述的系统，其特征在于，
    所述OLT获取所述第一上行通道和所述第二上行通道的通道传输质量；当所述第一上行通道的通道传输质量优于所述第二上行通道的通道传输质量时，控制所述第一上行通道关闭注册功能，控制所述第二上行通道开启注册功能。
  7. 根据权利要求1至5任一所述的系统，其特征在于，
    所述OLT存储生成的所述上行带宽授权；
    所述OLT根据所述上行带宽授权控制上行数据接收，和/或，根据所述上行带宽授权对各个所述ONU发送的上行数据进行鉴权及解析。
  8. 根据权利要求1至5任一所述的系统，其特征在于，
    所述ONU根据各个业务的延时需求确定各个业务所属的业务分类；
    所述ONU在所述业务分类指示所述业务属于第一分类时，通过所述第一上行通道发送所述业务对应的上行数据；
    所述ONU在所述业务分类指示所述业务属于第二分类时，通过所述第二上行通道发送所述业务对应的上行数据；
    其中，属于所述第一分类的业务的延时需求高于属于所述第二分类的业务的延时需求。
  9. 根据权利要求1至5任一所述的系统，其特征在于，
    若所述系统为吉比特无源光网络GPON系统，则带宽映射图BWmap消息中携带所述上行带宽授权；
    若所述系统为以太网无源光网络EPON系统，则Gate消息中携带所述上行带宽授权。
  10. 根据权利要求9所述的系统，其特征在于，
    当所述BWmap消息中携带所述上行带宽授权时，所述BWmap消息中预定字段的预定比特位用于标识所述BWmap消息对应的上行通道；
    当所述Gate消息中携带所述上行带宽授权时，所述Gate消息中新增的通道标识字段用于标识所述Gate消息对应的上行通道，或，所述Gate消息的操作码用于标识所述Gate消息对应的上行通道；
    其中，所述预定字段为start time字段或GrantSize字段，所述预定比特位为所述预定字段的最高1bit或最高2bit。
  11. 根据权利要求1至5任一所述的系统，其特征在于，
    所述下行通道、所述第一上行通道和所述第二上行通道采用波分复用的方式共用所述ODN，且所述第一上行通道与所述第二上行通道的波长不同。
  12. 一种光线路终端OLT，其特征在于，所述OLT包括：至少一个动态带宽分配DBA调度模块、下行传输汇聚TC模块、上行TC模块、下行发射机、 第一上行突发接收机和第二上行突发接收机；
    所述DBA调度模块用于生成上行带宽授权，所述上行带宽授权用于控制各个光网络单元ONU发送上行数据；
    所述下行TC模块与所述DBA调度模块相连，用于通过下行成帧汇聚生成包含所述上行带宽授权的下行数据；
    所述下行发射机与所述下行TC模块相连，用于通过下行通道向各个所述ONU发送所述下行数据；
    所述上行TC模块与所述第一上行突发接收机相连，用于通过所述第一上行突发接收机接收各个所述ONU在第一上行通道上发送的上行数据；
    所述上行TC模块还与所述第二上行突发接收机相连，用于通过所述第二上行突发接收机接收各个所述ONU在第二上行通道上发送的上行数据；
    其中，所述第一上行通道关闭注册功能，所述第二上行通道开启注册功能，所述注册功能用于对未注册的所述ONU进行注册。
  13. 根据权利要求12所述的OLT，其特征在于，所述下行数据中包含第一上行带宽授权和第二上行带宽授权，所述第一上行带宽授权用于控制所述ONU在所述第一上行通道上发送上行数据，所述第二上行带宽授权用于控制所述ONU在所述第二上行通道上发送上行数据。
  14. 根据权利要求13所述的OLT，其特征在于，所述OLT包括第一DBA调度模块、第二DBA调度模块以及复用模块；
    所述第一DBA调度模块用于生成所述第一上行带宽授权；
    所述第二DBA调度模块用于生成所述第二上行带宽授权；
    所述复用模块分别与所述第一DBA调度模块和所述第二DBA调度模块相连，用于对所述第一上行带宽授权和所述第二上行带宽授权进行复用；
    所述复用模块还与所述下行TC模块相连，用于向所述下行TC模块提供复用后的上行带宽授权。
  15. 根据权利要求14所述的OLT，其特征在于，所述第一上行通道用于传输上行业务数据，所述第二上行通道用于传输注册响应报文；
    所述第一DBA调度模块，用于生成包含上行发送时隙的所述第一上行带宽 授权；
    所述第二DBA调度模块，用于生成包含注册时隙的所述第二上行带宽授权；
    其中，所述上行发送时隙用于指示已注册的所述ONU在所述第一上行通道上发送所述上行业务数据，所述注册时隙用于指示未注册的所述ONU在所述第二上行通道上发送所述注册响应报文。
  16. 根据权利要求14所述的OLT，其特征在于，所述第一上行通道用于传输第一上行业务数据，所述第二上行通道用于传输注册响应报文及第二上行业务数据，所述第一上行业务数据的时延需求高于所述第二上行业务数据的时延需求；
    所述第一DBA调度模块，用于生成包含第一上行发送时隙的所述第一上行带宽授权；
    所述第二DBA调度模块，用于生成包含第二上行发送时隙以及注册时隙的所述第二上行带宽授权；
    其中，所述第一上行发送时隙用于指示已注册的所述ONU在所述第一上行通道上发送所述第一上行业务数据，所述第二上行发送时隙用于指示已注册的所述ONU在所述第二上行通道上发送所述第二上行业务数据，所述注册时隙用于指示未注册的所述ONU在所述第二上行通道上发送注册响应报文，所述第一上行业务数据的延时需求高于所述第二上行业务数据的延时需求。
  17. 根据权利要求14至16任一所述的OLT，其特征在于，所述OLT还包括控制模块，所述控制模块分别与所述第一DBA调度模块和所述第二DBA调度模块相连；
    所述控制模块，用于控制所述第一DBA调度模块关闭注册功能，并控制所述第二DBA调度模块开启注册功能；
    其中，开启注册功能的所述第二DBA调度模块生成的所述第二上行带宽授权中包含注册时隙，所述注册时隙用于指示未注册的所述ONU在所述第二上行通道上发送注册响应报文。
  18. 根据权利要求13所述的OLT，其特征在于，所述OLT包括一个所述DBA调度模块以及与所述DBA调度模块相连的控制模块；
    所述控制模块，用于控制所述DBA调度模块开启或关闭注册功能；
    所述DBA调度模块，用于在关闭注册功能时，生成包含第一上行发送时隙的所述第一上行带宽授权，或，生成包含所述第一上行发送时隙的所述第一上行带宽授权以及包含第二上行发送时隙的所述第二上行带宽授权；
    所述DBA调度模块，还用于在开启注册功能时，生成包含第一上行发送时隙的所述第一上行带宽授权以及包含注册时隙的所述第二上行带宽授权；
    其中，所述第一上行发送时隙用于指示已注册的所述ONU在所述第一上行通道上发送上行业务数据，所述第二上行发送时隙用于指示已注册的所述ONU在所述第二上行通道上发送上行业务数据，所述第一上行业务数据的时延需求高于所述第二上行业务数据的时延需求，所述注册时隙用于指示未注册的所述ONU在所述第二上行通道上发送注册响应报文。
  19. 根据权利要求12至18任一所述的OLT，其特征在于，所述OLT中还包括存储器；
    所述存储器与各个所述DBA调度模块相连，用于存储各个所述DBA调度模块生成的所述上行带宽授权；
    所述上行TC模块与所述存储器相连，用于根据所述上行带宽授权控制所述第一上行突发接收机和所述第二上行突发接收机接收上行数据，和/或，根据所述上行带宽授权对各个所述ONU发送的上行数据进行鉴权及解析。
  20. 根据权利要求12至19任一所述的OLT，其特征在于，
    若所述OLT用于吉比特无源光网络GPON系统，则带宽映射图BWmap消息中携带所述上行带宽授权；
    若所述OLT用于以太网无源光网络EPON系统，则Gate消息中携带所述上行带宽授权。
  21. 根据权利要求20所述的OLT，其特征在于，
    当所述BWmap消息中携带所述上行带宽授权时，所述BWmap消息中预定字段的预定比特位用于标识所述BWmap消息对应的上行通道；
    当所述Gate消息中携带所述上行带宽授权时，所述Gate消息中新增的通道标识字段用于标识所述Gate消息对应的上行通道，或，所述Gate消息的操作码 用于标识所述Gate消息对应的上行通道。
    其中，所述预定字段为start time字段或GrantSize字段，所述预定比特位为所述预定字段的最高1bit或最高2bit。
  22. 根据权利要求12至19任一所述的OLT，其特征在于，
    所述下行通道、所述第一上行通道和所述第二上行通道采用波分复用的方式共用同一光分配网络ODN，且所述第一上行通道与所述第二上行通道的波长不同。
  23. 一种光网络单元ONU，其特征在于，所述ONU包括：下行传输汇聚TC模块、至少一个动态带宽分配DBA响应模块、上行TC模块、下行接收机、第一上行突发发射机和第二上行突发发射机；
    所述下行TC模块分别与所述下行接收机和所述DBA响应模块相连，用于向所述DBA响应模块提供所述下行接收机通过下行通道接收到的下行数据，所述下行数据由光线路终端OLT发送；
    所述DBA响应模块与所述上行TC模块相连，用于根据所述下行数据中包含的上行带宽授权控制所述上行TC模块发送上行数据；
    所述上行TC模块与所述第一上行突发发射机相连，用于通过所述第一上行突发发射机在第一上行通道上发送上行数据；
    所述上行TC模块与所述第二上行突发发射机相连，用于通过所述第二上行突发发射机在第二上行通道上发送上行数据；
    其中，所述第一上行通道关闭注册功能，所述第二上行通道开启注册功能，所述注册功能用于对未注册的所述ONU进行注册。
  24. 根据权利要求23所述的ONU，其特征在于，所述下行数据中包含第一上行带宽授权和第二上行带宽授权，所述第一上行带宽授权用于控制所述ONU在所述第一上行通道上发送上行数据，所述第二上行带宽授权用于控制所述ONU在所述第二上行通道上发送上行数据。
  25. 根据权利要求24所述的ONU，其特征在于，所述ONU包括第一DBA响应模块、第二DBA响应模块和解复用模块；
    所述解复用模块与所述下行TC模块相连，用于对所述下行TC模块接收到的上行带宽授权进行解复用，得到所述第一上行带宽授权和第二上行带宽授权；
    所述第一DBA响应模块与所述解复用模块相连，用于根据所述第一上行带宽授权控制所述上行TC模块通过所述第一上行通道发送上行数据；
    所述第二DBA响应模块与所述解复用模块相连，用于根据所述第二上行带宽授权控制所述上行TC模块通过所述第二上行通道发送上行数据。
  26. 根据权利要求25所述的ONU，其特征在于，所述第一上行通道用于传输上行业务数据，所述第二上行通道用于传输注册响应报文；
    若所述ONU处于已注册状态，所述上行TC模块，用于根据所述第一上行带宽授权中的上行发送时隙，向所述第一上行突发发射机发送第一使能信号，所述第一使能信号用于指示所述第一上行突发发射机通过所述第一上行通道发送所述上行业务数据；
    若所述ONU处于未注册状态，所述上行TC模块，用于根据所述第二上行带宽授权中的注册时隙，向所述第二上行突发发射机发送第二使能信号，所述第二使能信号用于指示所述第二上行突发发射机通过所述第二上行通道发送注册响应报文。
  27. 根据权利要求25或26所述的ONU，其特征在于，所述ONU中包括光模块槽位，所述光模块槽位用于插入第一光模块或第二光模块；
    所述第一光模块中至少包括所述下行接收机和所述第一上行突发发射机；
    所述第二光模块中至少包括所述下行接收机和所述第二上行突发发射机；
    其中，当所述ONU处于未注册状态时，所述第二光模块插入所述光模块槽位；当所述ONU处于已注册状态时，所述第一光模块插入所述光模块槽位。
  28. 根据权利要求25所述的ONU，其特征在于，所述第一上行通道用于传输第一上行业务数据，所述第二上行通道用于传输注册响应报文及第二上行业务数据，所述第一上行业务数据的延时需求高于所述第二上行业务数据的延时需求；
    若所述ONU处于已注册状态，所述上行TC模块，用于根据所述第一上行带宽授权中的第一上行发送时隙，向所述第一上行突发发射机发送第三使能信 号，所述第三使能信号用于指示所述第一上行突发发射机通过所述第一上行通道发送所述第一上行业务数据；根据所述第二上行带宽授权中的第二上行发送时隙，向所述第二上行突发发射机发送第四使能信号，所述第四使能信号用于指示所述第二上行突发发射机通过所述第二上行通道发送所述第二上行业务数据；
    若所述ONU处于未注册状态，所述上行TC模块，用于根据所述第二上行带宽授权中的注册时隙，向所述第二上行突发发射机发送第五使能信号，所述第五使能信号用于指示所述第二上行突发发射机通过所述第二上行通道发送所述注册响应报文。
  29. 根据权利要求27所述的ONU，其特征在于，所述ONU还包括业务分类模块；
    所述业务分类模块，用于收集各个业务的延时需求，并根据所述延时需求确定各个业务所属的业务分类；
    所述DBA响应模块与所述业务分类模块相连，用于当所述业务分类指示所述业务属于第一分类时，控制所述上行TC模块通过所述第一上行通道发送所述业务对应的所述第一上行业务数据；
    所述DBA响应模块，还用于当所述业务分类指示所述业务属于第二分类时，控制所述上行TC模块通过所述第二上行通道发送所述业务对应的所述第二上行业务数据。
  30. 根据权利要求28或29所述的ONU，其特征在于，所述ONU中包括第一光模块槽位和第二光模块槽位，所述第一光模块槽位用于插入第一光模块，所述第二光模块槽位用于插入第二光模块；
    所述第一光模块中至少包括所述第一上行突发发射机；
    所述第二光模块中至少包括所述下行接收机和所述第二上行突发发射机；
    其中，当传输所述第二上行业务数据时，所述第二光模块插入所述第二光模块槽位；当传输所述第一上行业务数据和所述第二上行业务数据时，所述第二光模块插入所述第二光模块槽位且所述第一光模块插入所述第一光模块槽位。
  31. 根据权利要求24所述的ONU，其特征在于，所述ONU包括一个所述DBA响应模块和通道选择模块；
    所述通道选择模块分别与所述第一上行突发发射机、第二上行突发发射机和所述上行TC模块相连；
    所述DBA响应模块，用于根据所述第一上行带宽授权控制所述上行TC模块发送上行业务数据，或，根据所述第二上行带宽授权控制所述上行TC模块发送注册响应报文；
    所述通道选择模块，用于在所述ONU处于已注册状态时，选择所述第一上行突发发射机发送所述上行TC模块生成的所述上行业务数据，或，在所述ONU处于未注册状态时，选择所述第二上行突发发射机发送所述上行TC模块生成的所述注册响应报文。
  32. 根据权利要求23至31任一所述的ONU，其特征在于，
    若所述ONU用于吉比特无源光网络GPON系统，则带宽映射图BWmap消息中携带所述上行带宽授权；
    若所述ONU用于以太网无源光网络EPON系统，则Gate消息中携带所述上行带宽授权。
  33. 根据权利要求32所述的ONU，其特征在于，
    当所述BWmap消息中携带所述上行带宽授权时，所述BWmap消息中预定字段的预定比特位用于标识所述BWmap消息对应的上行通道；
    当所述Gate消息中携带所述上行带宽授权时，所述Gate消息中新增的通道标识字段用于标识所述Gate消息对应的上行通道，或，所述Gate消息的操作码用于标识所述Gate消息对应的上行通道；
    其中，所述预定字段为start time字段或GrantSize字段，所述预定比特位为所述预定字段的最高1bit或最高2bit。
  34. 根据权利要求23至31任一所述的ONU，其特征在于，
    所述下行通道、所述第一上行通道和所述第二上行通道采用波分复用的方式共用同一光分配网络ODN，且所述第一上行通道与所述第二上行通道的波长不同。
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