CN110582030A

CN110582030A - Method, device and system for processing passive optical network signal

Info

Publication number: CN110582030A
Application number: CN201810582944.2A
Authority: CN
Inventors: 高波; 刘德坤; 景磊; 吴徐明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-06-07
Filing date: 2018-06-07
Publication date: 2019-12-17
Also published as: WO2019233177A1

Abstract

the embodiment of the application discloses a method, a device and a system for starting and closing a wavelength channel precoding function of a passive optical network, wherein a plurality of downlink wavelength channels and a plurality of uplink wavelength channels are enveloped between an optical line terminal and an optical network unit, the optical line terminal generates an indication message and sends the indication message to the optical network unit, and the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on the downlink wavelength channel corresponding to the at least one wavelength is decoded; if the indication information indicates that the optical network unit decodes, precoding a signal to be transmitted on a downlink wavelength channel corresponding to at least one wavelength; and if the indication information indicates that the optical network unit does not decode, not precoding the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength. The precoding function of each wavelength channel between the optical line terminal and the optical network unit can be started and closed at any time.

Description

Method, device and system for processing passive optical network signal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for processing a Passive Optical Network (PON) signal.

background

With the increasing demand for bandwidth by users and the support of broadband strategy of governments of various countries, Passive Optical Networks (PONs) are deployed in large quantities around the world.

Generally, a PON system includes an Optical Line Terminal (OLT) located in a central office, a plurality of Optical Network units or Optical Network Terminals (ONTs) located at a subscriber side, and an Optical Distribution Network (ODN) for multiplexing/demultiplexing Optical signals between the Optical Line Terminal and the Optical Network units. The optical line terminal and the optical network unit receive and transmit uplink and downlink data through an optical module arranged in the optical line terminal and the optical network unit. Since the existing Gigabit passive optical network (Gigabit PON, GPON) or Ethernet passive optical network (Ethernet PON, EPON) or 10GPON or 10GEPON which is already deployed or is being deployed is a single-wavelength system, that is, the upstream (direction from ONU to OLT is referred to as upstream) and downstream (direction from OLT to ONU is referred to as downstream) directions have only one wavelength, upstream and downstream bandwidths are shared by a plurality of ONUs, which limits the increase of the bandwidth of each ONU, and for convenience of introduction, the following ONUs are the names of ONUs and/or ONTs.

in order to increase the bandwidth of the same optical fiber transmission, the international Telecommunication union Telecommunication Standardization organization (ITU-T) is making a Time Division Wavelength Division multiplexing passive optical network (TWDM-PON) standard organization, where the TWDM-PON is a Time Division Multiplexing (TDM) and Wavelength Division multiplexing (Time Division multiplexing, WDM) hybrid system, a plurality of wavelengths (generally 4 to 8) are transmitted in a WDM manner in a downlink direction, and a plurality of wavelengths (generally 4 to 8) are transmitted in a WDM manner in an uplink direction. Each ONU can selectively receive data of any one downstream wavelength and upload data at any one upstream wavelength, and the specific wavelength allocation is controlled by the OLT, mainly by a Media Access Control (MAC) module of the OLT for function control. Each wavelength works in a TDM mode, namely one wavelength can be accessed to a plurality of ONUs, and each ONU accessing the same wavelength in the downlink direction occupies the bandwidth of a part of time slots; and each ONU accessing the same wavelength in the uplink direction uploads data in a time-sharing manner. In a TWDM-PON, which wavelength an ONU registers to is controlled by the OLT. Because a Laser Diode (LD) for implementing electro-optical conversion and a Photo Detector (PD) for implementing electro-optical conversion are generally Pluggable optical modules in an optical module, such as a Small Form-factor plug (SFP), an OLT needs to control an optical module of an ONU to select a certain wavelength for receiving and transmitting through a MAC of the ONU.

In recent years, 25G PON and 100G PON have become a hot spot for technical research. The IEEE 802.3 working group established the IEEE 802.3ca 100G-EPON working group 11/2015, which is intended to support multiple Medium Access Control (MAC) rates of 25G/50G/100G, wherein the single-wavelength transmission rate is 25Gbps, and the 4-wavelength division multiplexing realizes 100Gbps transmission.

the 25GEPON system adds a precoding function and a de-precoding function to a Physical Coding Sublayer (PCS), but the precoding function of a wavelength channel cannot be changed once the precoding function is configured in factory.

Disclosure of Invention

In view of this, embodiments of the present application provide a method, an apparatus, and a system for processing a passive optical network signal, where a precoding function of each wavelength channel can be turned on and off at any time.

In a first aspect, an embodiment of the present application provides a method for processing a passive optical network signal, where the passive optical network includes an optical line terminal and an optical network unit, the optical line terminal is connected to the optical network unit through a plurality of wavelength channels, a direction from the optical line terminal to the optical network unit is a downlink, and a direction from the optical network unit to the optical line terminal is an uplink, and the method includes: an optical line terminal generates an indication message, and sends the indication message to an optical network unit, wherein the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded; if the indication information indicates that the optical network unit decodes, the optical line terminal starts precoding of a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, the optical line terminal does not precode the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength.

In one possible design, the indication message further includes time information for starting precoding parameter adjustment; if the indication information indicates that the optical network unit decodes, timing is started after the indication information is sent to the optical network unit, and signals to be sent on a downlink wavelength channel corresponding to the at least one wavelength are precoded after the switching time is started.

in one possible design, the method further comprises: the optical line terminal respectively configures corresponding precoding configuration information for signals to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; and the optical line terminal broadcasts the precoding configuration information in a downlink manner.

In a possible design, before issuing the indication message, the method further includes: the optical line terminal sends a precoding information query request to the optical network unit; the optical line terminal obtains the decoding information and/or the decoding capability and/or the decoding function prohibition and enable reference configuration of the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength reported by the optical network unit, and the precoding state and/or the precoding capability and/or the precoding prohibition and enable reference configuration of the signal to be sent on the uplink wavelength channel corresponding to the at least one wavelength.

In one possible design, the method further comprises: and downlink broadcasting a message whether a signal to be sent is precoded on an uplink wavelength channel corresponding to at least one wavelength of the optical network unit.

In a second aspect, an embodiment of the present application provides a method for processing a passive optical network signal, where the method includes: an optical network unit receives an indication message issued by an optical line terminal, wherein the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength is decoded by the optical network unit; if the indication information indicates that the optical network unit decodes, the optical network unit starts decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, the optical network unit stops decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength.

In one possible design, the method further includes: and the optical network unit receives a message whether a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength is precoded or not, wherein the message is broadcasted by the optical line terminal.

in one possible design, the method further includes: an optical network unit receives a precoding information query request sent by an optical line terminal; and the optical network unit reports the decoding information and/or the decoding capability and/or the decoding function prohibition and enable reference configuration of the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength, and reports the precoding state and/or the precoding capability and/or the precoding prohibition and enable reference configuration of the signal to be received on the uplink wavelength channel corresponding to the at least one wavelength.

In a possible design, the indication message further includes time information for starting precoding or prohibiting precoding; and the optical network unit starts timing after receiving the adjustment message, and starts decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or stops decoding the signal to be received on the downlink wavelength channel of the at least one wavelength after reaching the expected time.

In one possible design, the method further comprises: and the optical network unit receives a message which is broadcast by the optical line terminal and is used for determining whether a signal to be transmitted on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit is precoded or not.

In one possible design, the method further comprises: and the optical network unit receives the authorization message issued by the optical line terminal, and starts to encode or adjusts the signal to be transmitted on the uplink wavelength channel corresponding to the at least one wavelength to be uncoded in the uplink time slot identified by the authorization message.

in a third aspect, an embodiment of the present application provides an optical line terminal, including: a generating unit configured to generate an instruction message; a first sending unit, configured to send an indication message to an optical network unit, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded; a first precoding unit, configured to start precoding for a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength if the indication information indicates that the optical network unit decodes; and if the indication information indicates that the optical network unit does not decode, not precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength.

in one possible design, the optical line terminal further includes: a configuration unit, configured to configure corresponding precoding configuration information for signals to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; the first sending unit is further configured to broadcast the precoding configuration information in a downlink.

In a possible design, the optical line terminal further includes a first receiving unit, and the first sending unit is further configured to send a precoding information query request to the optical network unit; the first receiving unit is configured to obtain a precoding prohibition or enabling state and/or a precoding capability and/or a precoding function prohibition and enabling reference configuration of a downlink wavelength channel and an uplink wavelength channel corresponding to the at least one wavelength, which are reported by the optical network unit.

In a possible design, the indication message further includes time information for starting precoding or prohibiting precoding, and the optical line terminal further includes: and the first timing unit is used for starting timing after the indication message is sent to the optical network unit, and precoding a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength after the switching starting time is reached.

In a possible design, the first sending unit is further configured to broadcast, in a downlink, a message indicating whether a signal to be sent is precoded on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit.

In a fourth aspect, an embodiment of the present application provides an optical network unit, including: a second receiving unit, configured to receive an indication message sent by an optical line terminal, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded; a second pre-coding unit, configured to, if the indication information indicates that the optical network unit decodes, start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, stopping decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength.

In a possible design, the second receiving unit is further configured to receive a message indicating whether signals to be transmitted on all downlink wavelength channels broadcast by the optical line terminal are precoded.

In a possible design, the second receiving unit is further configured to receive a precoding information query request issued by an optical line terminal; a second sending unit, configured to report decoding information and/or decoding capability and/or decoding function prohibition and enabling reference configuration of a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength, and a precoding state and/or precoding capability and/or precoding prohibition and enabling reference configuration of a signal to be sent on an uplink wavelength channel corresponding to the at least one wavelength.

in a possible design, the indication message further includes time information for enabling precoding or disabling precoding, and the optical network unit further includes: and a second timing unit, configured to start timing after receiving the adjustment message, and start decoding a signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or stop decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength after an expected time.

In a possible design, the second receiving unit further receives a message, which is broadcast by the optical line terminal, of whether a signal to be transmitted on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit is precoded.

in a possible design, the second receiving unit further receives an authorization message sent by the optical line terminal; the second control unit is further configured to start coding or adjust coding to no coding for a signal to be sent on the uplink wavelength channel corresponding to the at least one wavelength in the uplink timeslot identified by the grant message.

in a fifth aspect, an embodiment of the present application provides a passive optical network system, where the passive optical network system includes the optical line terminal according to the third aspect and the optical network unit according to the fourth aspect.

In a sixth aspect, an embodiment of the present application provides a network device, including: a processor, a memory, a bus, and a communication interface; the memory is used for storing computer-executable instructions, the processor is connected with the memory through the bus, and when the device runs, the processor executes the computer-executable instructions stored in the memory, so that the device executes the method of any one of the first aspect or the second aspect.

in a seventh aspect, there is provided a computer storage medium for storing computer software instructions comprising a program for performing a method as in any one of the first or second aspects.

in an eighth aspect, there is provided a computer program product comprising computer software instructions loadable by a processor to perform a program of the method of any of the first or second aspects.

It is to be understood that the claimed subject matter may be varied between different embodiments, but the specific implementation details may be mutually varied, some of the claimed subject matter may not be specifically illustrated, and other respective subject matter may be referred to.

In summary, in the embodiments of the present invention, the precoding function of each wavelength channel between the optical line terminal and the optical network unit can be turned on and off at any time, and compared with the existing device that selects a corresponding category during installation, the device is installed without distinction by using the scheme, and the precoding function can be switched as needed after installation.

drawings

Fig. 1(a) is a schematic structural diagram of a conventional GPON passive optical network system;

fig. 1(b) is a schematic structural diagram of a conventional TWDM-PON passive optical network system;

fig. 2 is a flowchart of a method for processing a passive optical network signal according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of an optical line terminal according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of an optical line terminal according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of an optical line terminal according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an optical network unit according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of an optical network unit according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of a network device according to an embodiment of the present invention.

Detailed Description

in order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

fig. 1(a) and 1(b) are schematic structural diagrams of a GPON passive optical network system. The passive optical network system includes an optical line terminal OLT110, a plurality of optical network units ONU120, and the OLT110 and the ONU120 are connected through an optical distribution network ODN 130. The OLT110 further includes a data processing module 111 and an optical module 112, where the data processing module may also be referred to as a MAC module, and is used for managing and controlling the optical module 112. The ODN130 further includes a trunk optical fiber 133, a first stage splitter131, a first stage branch optical fiber 134, a second stage splitter 132, and a second stage branch optical fiber 135. The ONU further comprises an optical module 123 for receiving the downstream optical signal and transmitting the upstream optical signal.

fig. 2 is a schematic structural diagram of a TWDM-PON passive optical network system. The TWDM-PON system includes an OLT210, a plurality of ONUs 220, and an ODN230, wherein the OLT210 is connected to the ONUs 220 in a Point-to-multipoint (P2 MP) manner through the ODN 230. Where multiple ONUs 220 share the optical transmission medium of ODN 230. ODN230 may include a trunk fiber 231, an optical power splitting module 232, and a plurality of branch fibers 233. The optical power splitting module 232 may be disposed at a Remote Node (RN), which is connected to the OLT210 through a trunk fiber 231 and is connected to the ONUs 220 through a plurality of branch fibers 233, respectively. In the TWDM-PON system, the communication link between the OLT210 and the plurality of ONUs 220 may include a plurality of wavelength channels, and the plurality of wavelength channels share the optical transmission medium of the ODN230 in a WDM manner. Each ONU220 may operate on one of the wavelength channels of the TWDM-PON system, and each wavelength channel may carry traffic of one or more ONUs 220. And, the ONUs 220 operating on the same wavelength channel may share the wavelength channel in a TDM manner. In fig. 2, the TWDM-PON system is described as having four wavelength channels, it should be understood that, in practical applications, the number of wavelength channels of the TWDM-PON system may also be determined according to network requirements.

For convenience of description, in fig. 2, the four wavelength channels of the TWDM-PON system are named as wavelength channel 1, wavelength channel 2, wavelength channel 3, and wavelength channel 4, respectively, where each wavelength channel uses a pair of uplink and downlink wavelengths, for example, the uplink wavelength and the downlink wavelength of wavelength channel 1 may be λ u1 and λ d1, respectively, the uplink wavelength and the downlink wavelength of wavelength channel 2 may be λ u2 and λ d2, the uplink wavelength and the downlink wavelength of wavelength channel 3 may be λ u3 and λ d3, respectively, and the uplink wavelength and the downlink wavelength of wavelength channel 4 may be λ u4 and λ d4, respectively. Each wavelength channel may have a corresponding wavelength channel identifier (for example, the channel numbers of the four wavelength channels may be 1, 2, 3, and 4, respectively), that is, the wavelength channel identifier has a matching relationship with the uplink and downlink wavelengths of the wavelength channel identified by the wavelength channel identifier, and the OLT210 and the ONU220 may obtain the uplink wavelength and the downlink wavelength of the wavelength channel according to the wavelength channel identifier.

the OLT210 may include an optical coupler 211, a first wavelength division multiplexer 212, a second wavelength division multiplexer 213, a plurality of downstream optical transmitters Tx 1-Tx 4, a plurality of upstream optical receivers Rx 1-Rx 4, and a processing module 214. The plurality of downstream optical transmitters Tx1 to Tx4 are connected to the optical coupler 211 through the first wavelength division multiplexer 212, the plurality of upstream optical receivers Rx1 to Rx4 are connected to the optical coupler 211 through the second wavelength division multiplexer 213, and the coupler 211 is further connected to the trunk fiber 231 of the ODN 230.

The emission wavelengths of the plurality of downstream optical transmitters Tx1 to Tx4 are different, wherein each of the downstream optical transmitters Tx1 to Tx4 may respectively correspond to one of the wavelength channels of the TWDM-PON system, for example, the emission wavelengths of the plurality of downstream optical transmitters Tx1 to Tx4 may respectively be λ d1 to λ d 4. The downstream optical transmitters Tx 1-Tx 4 may transmit downstream data to the corresponding wavelength channels using their transmission wavelengths λ d 1- λ d4, respectively, so as to be received by the ONUs 120 operating on the corresponding wavelength channels. Correspondingly, the receiving wavelengths of the plurality of uplink optical receivers Rx 1-Rx 4 may be different, wherein each of the uplink optical receivers Rx 1-Rx 4 also corresponds to one of the wavelength channels of the TWDM-PON system, for example, the receiving wavelengths of the plurality of uplink optical receivers Rx 1-Rx 4 may be λ u 1- λ u4, respectively. The uplink optical receivers Rx1 to Rx4 may receive the uplink data transmitted by the ONU220 operating on the corresponding wavelength channel by using the receiving wavelengths λ u1 to λ u 4.

The first wavelength division multiplexer 212 is configured to perform wavelength division multiplexing on the downlink data with wavelengths λ d1 to λ d4 transmitted by the plurality of downlink optical transmitters Tx1 to Tx4, and transmit the downlink data to the trunk fiber 231 of the ODN230 through the optical coupler 211, so as to provide the downlink data to the ONU220 through the ODN 230. The optical coupler 211 may be configured to provide the second wavelength division multiplexer 213 with the upstream data from the plurality of ONUs 220 and having wavelengths λ u1 to λ u4, and the second wavelength division multiplexer 213 may demultiplex the upstream data having wavelengths λ u1 to λ u4 to the upstream optical receivers Rx1 to Rx4, and receive the data.

The processing module 214 may be a Media Access Control (MAC) module, which may, on one hand, assign operating wavelength channels to a plurality of ONUs 220 through wavelength negotiation, and provide downlink data to be sent to an ONU220 to downlink optical transmitters Tx1 to Tx4 corresponding to the wavelength channels according to the operating wavelength channels of a certain ONU220, so that the downlink optical transmitters Tx1 to Tx4 transmit the downlink data to the corresponding wavelength channels, and on the other hand, the processing module 214 may also perform Dynamic Bandwidth Allocation (DBA) for uplink transmission on each wavelength channel, allocate uplink transmission timeslots to the ONUs 220 multiplexed to the same wavelength channel in a TDM manner, and authorize the ONU220 to transmit the uplink data through the corresponding wavelength channels in the assigned timeslots.

The uplink transmission wavelength and the downlink reception wavelength of each ONU220 are adjustable, and the ONU220 can adjust the uplink transmission wavelength and the downlink reception wavelength thereof to the uplink wavelength and the downlink wavelength of the wavelength channel according to the wavelength channel specified by the OLT210, thereby implementing transmission and reception of uplink and downlink data through the wavelength channel.

the technical scheme of the embodiment of the invention can be applied to various Ethernet Passive Optical Networks (EPONs) and Gigabit Passive Optical Networks (GPONs), such as 10G EPON, single-wave 25G EPON, 2 x 25G EPON, single-wave 50G EPON, 2 x 50G EPON, 100G EPON and the like.

The method for processing signals provided by the embodiment of the present invention will be described in detail below with reference to the accompanying drawings, as shown in fig. 2, the method includes steps S200 to S208, and the specific implementation manner of each step is as follows:

S200, after the ONU is successfully registered, the OLT sends a precoding information inquiry request to the ONU.

The query request message frame format is shown in table one, for example:

Watch 1

Field(s)	occupied byte
		destination Address (Destination Address)	6
source Address (Source Address)	6
		Length type value (L/T)	2
Operation code (Opcode)	2
		Timestamp (Timestamp)	4
Retention (Reserved)	40
		Frame Check Sequence (FCS)	4

In this embodiment, the value of the operation code is set to identify the type of the operation code, for example, Opcode ═ 0x0019 is set to identify that the query message queries the precoding information. Wherein if the length type value (L/T) <0x600 is the length of the data field, and if > <0x600 is the type of the control frame, the value 0x8808 is suggested in this embodiment.

S201, the ONU responds to the query request of the OLT, and reports the decoding information and/or the decoding capability and/or the decoding function prohibition and enable reference configuration of the signal to be received on each downlink wavelength channel, and the precoding state and/or the precoding capability and/or the precoding prohibition and enable reference configuration of the signal to be sent on each uplink wavelength channel.

The format of the report message frame is shown in the following table two:

Watch two

Wherein, each bit example of the Discovery Information field is as shown in table three below:

Watch III

Wherein, the precoding status field is represented by the following four:

Watch four

Wherein, the precoding parameter field is as shown in the following table five:

watch five

S202, the OLT acquires, from each downstream wavelength channel, decoding information and/or decoding capability and/or decoding function prohibition and enablement reference configuration of a signal to be received on each downstream wavelength channel reported by the ONU, and a precoding state and/or precoding capability and/or precoding prohibition and enablement reference configuration of a signal to be sent on each upstream wavelength channel.

And S203, the OLT respectively configures corresponding precoding configuration information for the signals to be sent on each downlink wavelength channel between the OLT and the ONU and broadcasts the precoding configuration information in a downlink manner.

The format of the downlink broadcast message frame is shown in the following table six:

watch six

Wherein each bit of the CH Assignment field is represented as shown in table seven below:

Watch seven

wherein, each bit of the Discovery Information field is illustrated in the following table eight:

Table eight

and S204, the OLT issues an indication message to the ONU, wherein the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the ONU on a downlink wavelength channel corresponding to the at least one wavelength is decoded.

the indication message may be sent periodically or triggered at some time as needed and may change whether one or more of the wavelength channels is encoded.

the field and byte representation included in the indication message are shown in table nine below, taking only four downlink wavelength channels as an example:

watch nine

Field(s)	byte(s)
		Destination Address (destination Address)	6
Source address (source address)	6
		Length type value (L/T)	2
Operation code (Opcode)	2
		timestamp (timestamp)	4
Channel configuration (CH Assignment)	1
		Channel 1 switching Time (Switch Time #1)	4
channel 2 switching Time (Switch Time #2)	4
		Channel 3 switching Time (Switch Time #3)	4
Channel 4 Switch Time (Switch Time #4)	4
		reserved field	23
Frame Check Sequence (FCS)	4

wherein, each bit of the CH Assignment field is represented as the following table ten:

Watch ten

it can be seen that each downlink wavelength channel has different values and has various combinations, and there may be different indications among multiple wavelength channels in one indication message.

And S205, after the OLT issues the indication message, starting a local timer to start timing, and precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength after the switching starting time is reached.

And S206, after receiving the indication message, the ONU starts a local timer to start timing. If the optical network unit is indicated to decode in the indication information, timing is started after the indication information is sent to the optical network unit, and signals to be sent on a downlink wavelength channel corresponding to the at least one wavelength are precoded after the switching time is started.

After receiving the indication message, the ONU starts decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength if the indication message indicates that the optical network unit decodes; and if the indication information indicates that the optical network unit does not decode, stopping decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength. For example, when the designated bit in the indication message is "0", it indicates that the optical line terminal has no precoding, and the ONU side does not need to decode; and when the bit is '1', indicating that the OLT side starts precoding and indicating the ONU to start decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength. The ONU may feed back the enable response information to the OLT, which may be carried in a registration response message (Register _ ACK) to inform the OLT whether the ONU decodes.

And S207, the ONU receives a message whether a signal to be transmitted on an uplink wavelength channel corresponding to each wavelength of the optical network unit broadcasted by the OLT is precoded or not.

S208, the ONU receives an authorization message which is sent by the OLT and carries uplink precoding enabling or enabling, and starts coding or adjusts the coding of a signal to be sent on an uplink wavelength channel to be not coded in an uplink time slot identified by the authorization message.

Wherein, the frame structure of the authorization message is shown in the following eleven:

Watch eleven

wherein each bit example of the CH Assignment field is shown in table twelve below:

watch twelve

Some of the above-mentioned messages are new messages defined by the embodiment of the present application, which are not defined by the existing protocol, such as the message defined in step S201 above. Some are generated by adding fields on the basis of messages defined by the existing protocol, such as messages defined in steps other than step S200 described above.

in order to ensure that the precoding function settings of different wavelength channels of the OLT and the ONU in the uplink and downlink directions are kept consistent and ensure that the OLT and the ONU normally communicate, the OLT can inquire the precoding related information of the ONU at any time.

As shown in fig. 3, an embodiment of the present application provides an optical line terminal, including:

A generating unit 301, configured to generate an indication message.

A first sending unit 302, configured to send an indication message to an optical network unit, where the indication message carries wavelength information and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded.

A first precoding unit 303, configured to start precoding for a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength if the indication information indicates that the optical network unit decodes; and if the indication information indicates that the optical network unit does not decode, not precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength.

in other embodiments, as shown in fig. 4, the optical line terminal further includes:

A configuring unit 304, configured to configure corresponding precoding configuration information for signals to be sent on a downlink wavelength channel corresponding to the at least one wavelength.

The aforementioned first sending unit 302 is further configured to broadcast the precoding configuration information in a downlink.

In other embodiments, as shown in fig. 5, the optical line terminal further includes a first receiving unit 305, and after the first sending unit 301 sends a precoding information query request to the optical network unit, the first receiving unit 305 obtains a precoding prohibition or enable state and/or a precoding capability and/or a precoding function prohibition and enable reference configuration of each downlink wavelength channel and each uplink wavelength channel reported by the optical network unit.

The OLT not only broadcasts the precoding prohibition or enable state of the downlink wavelength channel, but also broadcasts, for the uplink wavelength channel, a message indicating whether a signal to be transmitted is precoded on the uplink wavelength channel corresponding to each wavelength of the optical network unit in a downlink manner by the first transmitting unit 302.

As shown in fig. 5, in order to improve the accuracy of switching precoding enabling or disabling, the indication message further includes time information for starting precoding or disabling precoding, and the OLT further includes:

a first timing unit 306, configured to start timing after the indication message is sent to the optical network unit, and perform precoding on a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength after the switching start time is reached.

as shown in fig. 6, an embodiment of the present application provides an optical network unit, including:

the second receiving unit 401 is configured to broadcast, in a downlink, a message indicating whether a signal to be transmitted on an uplink wavelength channel corresponding to each wavelength of the optical network unit is precoded.

A second pre-coding unit 402, configured to, if the indication information indicates that the optical network unit decodes, start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, stopping decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength.

Optionally, the second receiving unit 401 is further configured to receive a message that whether signals to be sent on all downlink wavelength channels broadcast by the optical line terminal are precoded or not.

Optionally, the second receiving unit 401 is further configured to receive a precoding information query request issued by an optical line terminal; and the second sending unit is used for reporting the decoding information and/or the decoding capability and/or the decoding function prohibition and enabling reference configuration of the signals to be received on each downlink wavelength channel, and the precoding state and/or the precoding capability and/or the precoding prohibition and enabling reference configuration of the signals to be sent on each uplink wavelength channel.

The OLT not only broadcasts the precoding prohibition or enable state of the downlink wavelength channel, but also broadcasts, for the uplink wavelength channel, a message indicating whether a signal to be transmitted is precoded on the uplink wavelength channel corresponding to each wavelength of the optical network unit. Correspondingly, the second receiving unit 401 of the ONU further receives a message, which is broadcast by the optical line terminal, whether a signal to be transmitted on an uplink wavelength channel corresponding to each wavelength of the optical network unit is precoded. In one embodiment, the second receiving unit 401 further receives an authorization message sent by the OLT. The second pre-coding unit 402 is further configured to start coding or adjust coding to be not coded for a signal to be sent on the uplink wavelength channel in the uplink timeslot identified by the grant message.

As shown in fig. 7, in order to improve the accuracy of switching the precoding enabling or disabling, the indication message further includes time information for starting precoding or disabling precoding, and the ONU further includes:

A second timing unit 403, configured to start timing after receiving the adjustment message, and start decoding a signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or stop decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength after an expected time.

As shown in fig. 8, an embodiment of the present application provides a network device, which may be an OLT or an ONU, and the network device includes a processor 510, a memory 520, a transceiver 530, and a wavelength division multiplexer 540.

the processor 510 may be a general Central Processing Unit (CPU), a microprocessor, an application specific integrated circuit ASIC, or at least one integrated circuit, and is configured to execute related programs to implement the technical solution provided by the embodiment of the present invention.

The Memory 520 may be a Read Only Memory (ROM), a static Memory device, a dynamic Memory device, or a Random Access Memory (RAM). The memory 520 may store an operating system and other application programs. When the technical solution provided by the embodiment of the present invention is implemented by software or firmware, a program code for implementing the technical solution provided by the embodiment of the present invention is stored in the memory 520 and executed by the processor 510.

In an embodiment, the processor 510 may include memory 520 therein. In another embodiment, processor 510 and memory 520 are two separate structures.

The transceiver 540 may include an optical transmitter and/or an optical receiver. The optical transmitter may be used to transmit optical signals and the optical receiver may be used to receive optical signals. The light emitter may be implemented by a light emitting device such as a gas laser, a solid laser, a liquid laser, a semiconductor laser, a direct modulation laser, or the like. The optical receiver may be implemented by a photodetector, such as a photodetector or a photodiode (e.g., an avalanche diode), etc. The transceiver 540 may also include a digital-to-analog converter and an analog-to-digital converter.

The wavelength division multiplexer 850 is connected to the transceiver 540 and acts as a multiplexer when the network device is transmitting optical signals. When the network device receives an optical signal, the wavelength division multiplexer acts as a demultiplexer. Wavelength division multiplexers may also be referred to as optical couplers.

For more details of the above steps performed by the processor 510 and the transceiver 530, reference may be made to the above description of the embodiments of the method and the accompanying drawings, which are not described herein again.

the embodiments of the present invention also have various beneficial effects described in the above embodiments of the method, and are not described herein again.

in addition, an embodiment of the present application provides a computer storage medium for storing computer software instructions, which includes a program for executing the method shown in fig. 2.

In addition, an embodiment of the present application provides a computer program product, which is characterized by comprising computer software instructions, where the computer software instructions are loadable by a processor to execute the aforementioned program of the method shown in fig. 2.

For more details of the steps executed by each module of the apparatus, reference may be made to the description of each embodiment of the method and the accompanying drawings, which are not described herein again.

The invention also provides a PON system, which comprises the optical line terminal and the optical network unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

In summary, the above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a passive optical network signal, where the passive optical network includes an optical line terminal and an optical network unit, the optical line terminal is connected to the optical network unit through a plurality of wavelength channels, a direction from the optical line terminal to the optical network unit is a downlink, and a direction from the optical network unit to the optical line terminal is an uplink, the method comprising:

Generating an indication message, and issuing the indication message to the optical network unit, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded;

If the indication information indicates that the optical network unit decodes, precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, not precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength.

2. The method of claim 1, wherein the indication message further includes time information for starting precoding parameter adjustment;

If the indication information indicates that the optical network unit decodes, timing is started after the indication information is sent to the optical network unit, and signals to be sent on a downlink wavelength channel corresponding to the at least one wavelength are precoded after the switching time is started.

3. The method of claim 1, further comprising:

configuring corresponding precoding configuration information for signals to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength;

And broadcasting the precoding configuration information in a downlink.

4. The method of claim 1 or 2, wherein said issuing an indication message is preceded by:

sending a precoding information query request to the optical network unit;

Acquiring decoding information and/or decoding capability and/or decoding function prohibition and enabling reference configuration of a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength reported by the optical network unit, and acquiring precoding state and/or precoding capability and/or precoding prohibition and enabling reference configuration of a signal to be received on an uplink wavelength channel corresponding to the at least one wavelength.

5. The handover method of any one of claims 1-4, further comprising:

And downlink broadcasting a message whether a signal to be sent is precoded on an uplink wavelength channel corresponding to at least one wavelength of the optical network unit.

6. a method for processing a passive optical network signal, the method comprising:

receiving an indication message issued by an optical line terminal, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength is decoded by the optical network unit;

If the indication information indicates that the optical network unit decodes, starting decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, stopping decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength.

7. The method of claim 6, further comprising:

And receiving a message whether a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength is precoded or not, wherein the message is broadcasted by the optical line terminal.

8. The method of claim 6 or 7, further comprising:

Receiving a precoding information query request sent by a light line terminal;

and reporting decoding information and/or decoding capability and/or decoding function prohibition and enabling reference configuration of the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength, and reporting precoding state and/or precoding capability and/or precoding prohibition and enabling reference configuration of the signal to be received on the uplink wavelength channel corresponding to the at least one wavelength.

9. The method of claim 6, wherein the indication message further includes time information for enabling precoding or disabling precoding;

And starting timing after receiving the adjustment message, and starting decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or stopping decoding the signal to be received on the downlink wavelength channel of the at least one wavelength after reaching the expected time.

10. The method of any one of claims 6-9, further comprising:

And receiving a message, which is broadcast by the optical line terminal, whether a signal to be transmitted on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit is precoded or not.

11. The method of claim 10, further comprising:

And receiving an authorization message issued by the optical line terminal, and starting coding or adjusting the coding of a signal to be sent on an uplink wavelength channel corresponding to the at least one wavelength to be uncoded in an uplink time slot identified by the authorization message.

12. An optical line terminal, comprising:

A generating unit configured to generate an instruction message;

A first sending unit, configured to send an indication message to an optical network unit, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded;

A first precoding unit, configured to start precoding for a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength if the indication information indicates that the optical network unit decodes; and if the indication information indicates that the optical network unit does not decode, not precoding a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength.

13. The optical line terminal of claim 12, further comprising:

a configuration unit, configured to configure corresponding precoding configuration information for signals to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength;

The first sending unit is further configured to broadcast the precoding configuration information in a downlink.

14. the optical line terminal according to claim 12 or 13, further comprising a first receiving unit,

The first sending unit is further configured to send a precoding information query request to the optical network unit;

The first receiving unit is configured to obtain a precoding prohibition or enabling state and/or a precoding capability and/or a precoding function prohibition and enabling reference configuration of a downlink wavelength channel and an uplink wavelength channel corresponding to the at least one wavelength, which are reported by the optical network unit.

15. The olt of claim 12, wherein the indication message further includes time information to enable precoding or disable precoding, further comprising:

And the first timing unit is used for starting timing after the indication message is sent to the optical network unit, and precoding a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength after the switching starting time is reached.

16. The optical line terminal of claim 12,

the first sending unit is further configured to broadcast, in a downlink, a message indicating whether a signal to be sent is precoded on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit.

17. An optical network unit, comprising:

A second receiving unit, configured to receive an indication message sent by an optical line terminal, where the indication message carries wavelength information of at least one wavelength and indication information of whether a signal to be received by the optical network unit on a downlink wavelength channel corresponding to the at least one wavelength is decoded;

A second pre-coding unit, configured to, if the indication information indicates that the optical network unit decodes, start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; and if the indication information indicates that the optical network unit does not decode, stopping decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength.

18. The optical network unit of claim 17,

the second receiving unit is further configured to receive a message that whether signals to be sent on all downlink wavelength channels broadcast by the optical line terminal are precoded or not.

19. The optical network unit of claim 17,

the second receiving unit is further configured to receive a precoding information query request issued by the optical line terminal;

A second sending unit, configured to report decoding information and/or decoding capability and/or decoding function prohibition and enabling reference configuration of a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength, and a precoding state and/or precoding capability and/or precoding prohibition and enabling reference configuration of a signal to be sent on an uplink wavelength channel corresponding to the at least one wavelength.

20. The optical network unit according to claim 17, wherein the indication message further includes time information for enabling precoding or disabling precoding, further comprising:

And a second timing unit, configured to start timing after receiving the adjustment message, and start decoding a signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or stop decoding the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength after an expected time.

21. The optical network unit of claim 17,

The second receiving unit further receives a message, which is broadcast by the optical line terminal, of whether a signal to be transmitted on an uplink wavelength channel corresponding to the at least one wavelength of the optical network unit is precoded or not.

22. The optical network unit of claim 21,

The second receiving unit is also used for receiving an authorization message sent by the optical line terminal;

The second control unit is further configured to start coding or adjust coding to no coding for a signal to be sent on the uplink wavelength channel corresponding to the at least one wavelength in the uplink timeslot identified by the grant message.

23. A passive optical network system comprising an optical line terminal according to any of claims 12-16 and an optical network unit according to any of claims 17-22.

24. A network device, comprising: a processor, a memory, a bus, and a communication interface; the memory is used for storing computer-executable instructions, the processor is connected with the memory through the bus, and when the device runs, the processor executes the computer-executable instructions stored by the memory to enable the device to execute the method of any one of claims 1-5 or claims 6-11.

25. A computer storage medium for storing computer software instructions comprising a program for performing the method of any one of claims 1 to 5 or claims 6 to 11.

26. a computer program product comprising computer software instructions which are loadable by a processor to execute a program according to the method of any of claims 1-5 or 6-11.