WO2019233177A1

WO2019233177A1 - Method, device and system for processing passive optical network signal

Info

Publication number: WO2019233177A1
Application number: PCT/CN2019/082320
Authority: WO
Inventors: 高波; 刘德坤; 景磊; 吴徐明
Original assignee: 华为技术有限公司
Priority date: 2018-06-07
Filing date: 2019-04-11
Publication date: 2019-12-12
Also published as: CN110582030A

Abstract

Disclosed in embodiments of the present application are a method, device and system for enabling and disabling a wavelength channel pre-coding function of a passive optical network, wherein a plurality of downlink wavelength channels and a plurality of uplink wavelength channels are comprised between an optical line terminal and an optional network unit. The method comprises: an optical line terminal generates an instruction message and issues the instruction message to the optical network unit, the instruction message carrying wavelength information of at least one wavelength and instruction information about 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 instruction information instructs the optical network unit to decode, pre-code a signal to be sent on the downlink wavelength channel corresponding to the at least one wavelength is pre-coded; if the instruction information instructs the optical network unit not to decode, not pre-code the signal to be sent on the downlink wavelength channel corresponding to the at least one wavelength. In the embodiments of the present application, the pre-coding function of each wavelength channel between the optical line terminal and the optical network unit can be enabled and disabled at any time.

Description

Method, device and system for processing passive optical network signals

Technical field

The present invention relates to the field of communication technology, and more particularly, to a method, a device, and a system for processing a passive optical network (PON) signal.

Background technique

With the continuous increase of users 'demand for bandwidth and the support of governments' broadband strategies in various countries, passive optical networks (PONs) have been widely deployed worldwide.

Generally speaking, a PON system includes an optical line terminal (OLT) located at the central office, multiple optical network units or optical network terminals (ONU or Optical Network Terminal) (ONT) located at the user side, and An optical distribution network (Optical Distribution Network, ODN) for multiplexing / demultiplexing optical signals between an optical line terminal and an optical network unit. Among them, the optical line terminal and the optical network unit perform uplink and downlink data transmission and reception through an optical module provided in the optical line terminal and the optical network unit. As the existing Gigabit PON (GPON) or Ethernet PON (EPON) or 10GPON or 10GEPON that is already deployed or is being deployed is a single-wavelength system, that is, uplink (from ONU to OLT The direction is called the uplink) and downlink (the direction from the OLT to the ONU is called the downlink). There is only one wavelength. The uplink and downlink bandwidth are shared by multiple ONUs, which limits the bandwidth increase of each ONU. For the convenience of introduction, the following ONUs are ONU and / Or ONT's name.

In order to improve the bandwidth of the same optical fiber transmission, the International Telecommunication Union Telecommunication Standardization Organization (ITU-T) standard organization is developing a Time Division Wavelength Division Multiplexing Passive Optical Network (Time Division Multiplex PON, TWDM-PON). TWDM-PON is a time division multiplex (Time Division Multiplex (TDM)) and wavelength division multiplex (Time Division Multiplex (WDM)) hybrid system. There are multiple wavelengths (usually 4 to 8) in the downlink direction and transmitted in WDM mode. The uplink The direction is also multiple wavelengths (typically 4 to 8) transmitted in WDM mode. Each ONU can choose to receive data at any downstream wavelength and upload data at any upstream wavelength. The specific wavelength allocation is controlled by the OLT, which is mainly controlled by the Media Access Control (MAC) module of the OLT. Each wavelength also works in TDM mode, that is, one wavelength can access multiple ONUs, and each ONU that accesses the same wavelength in the downstream direction occupies a part of the bandwidth of the time slot; each ONU that accesses the same wavelength in the upstream direction shares time upload data. In TWDM-PON, which wavelength the ONU is registered to is controlled by the OLT. Because the laser (Laser, Diode, LD) that realizes electro-optical conversion and the photodetector (Photo Deetector, or PhotoDiode, PD) that realizes photoelectric conversion are generally optical modules, they are pluggable optical modules, such as small pluggable modules ( Small Form-factor (Pluggable, SFP), the OLT needs to control the ONU's optical module to select a certain wavelength for reception and transmission through the ONU's MAC.

In recent years, 25G PON and 100G PON have become hotspots in technology research. The IEEE 802.3 working group established the IEEE 802.3ca 100G-EPON working group in November 2015. The standard plan supports 25G / 50G / 100G multiple media access control layer (MAC) rates, of which the single-wavelength transmission rate must be Up to 25Gbps, 4 wavelength wavelength division multiplexing to achieve 100Gbps transmission.

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

Summary of the Invention

In view of this, the embodiments of the present application provide a method, a device, and a system for processing a passive optical network signal. The 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, wherein the passive optical network includes an optical line terminal and an optical network unit, and the optical line terminal communicates with the optical line terminal through multiple wavelength channels. The optical network unit is connected, and the direction from the optical line terminal to the optical network unit is downlink, and the direction from the optical network unit to the optical line terminal is uplink. The method includes: the optical line terminal generates an instruction message Sending the instruction message to the optical network unit, where the instruction message carries wavelength information of at least one wavelength and whether the 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 instruction information instructs the optical network unit to decode, the optical line terminal starts precoding the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength; if the instruction information indicates the optical If the network unit does not decode, the optical line terminal does not decode signals to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength. Line pre-coding.

In a possible design, the instruction message further includes time information for starting precoding parameter adjustment; if the instruction information instructs the optical network unit to perform decoding, the instruction message is sent to the optical network unit to start Timing, precoding the signals to be sent on the downlink wavelength channel corresponding to the at least one wavelength after the start switching time is reached.

In a possible design, the method further includes: the optical line terminal configures corresponding precoding configuration information for a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; the optical line terminal broadcasts the precoding configuration information downstream. .

In a possible design, before issuing the instruction 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 at least one wavelength corresponding to the optical network unit report The reference information for the decoding information and / or decoding capability and / or decoding function of the signal to be received on the downlink wavelength channel of the LTE and the precoding status of the signal to be transmitted on the uplink wavelength channel corresponding to the at least one wavelength and / Or precoding capability and / or precoding disable and enable reference configuration.

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

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

In a possible design, the method further includes: receiving, by the optical network unit, a message whether a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength broadcast by the optical line terminal is precoded.

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

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

In a possible design, the method further includes: receiving, by the optical network unit, 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 broadcasted by the optical line terminal.

In a possible design, the method further includes: the optical network unit receives an authorization message issued by the optical line terminal, and waits on an uplink wavelength channel corresponding to the at least one wavelength in an uplink time slot identified by the authorization message. The transmitted signal starts encoding or is adjusted from encoding to not encoding.

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; and a first sending unit configured to deliver an instruction message to an optical network unit, where the instruction message carries at least Wavelength information of one wavelength and indication information of whether the optical network unit decodes a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; a first precoding unit, configured to: if the indication information indicates the optical When the network unit decodes, precoding is performed on a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; if the instruction information indicates that the optical network unit does not decode, the downlink wavelength corresponding to the at least one wavelength The signals to be transmitted on the channel are not precoded.

In a possible design, the optical line terminal further includes: a configuration unit configured to respectively configure corresponding precoding configuration information for a signal to be transmitted on a downlink wavelength channel corresponding to the at least one wavelength; the first sending unit, It is also used for downlink broadcast of the precoding configuration information.

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 the optical The precoding is disabled or enabled and / or the precoding capability and / or the precoding function is disabled and enabled for the reference configuration reported by the network unit for the downstream wavelength channel and the upstream wavelength channel corresponding to the at least one wavelength.

In a possible design, the instruction message further includes time information for enabling precoding or prohibiting precoding, and the optical line terminal further includes: a first timing unit, configured to start after issuing the instruction message to the optical network unit. Timing, precoding the signals to be sent on the downlink wavelength channel corresponding to the at least one wavelength after the start switching time is reached.

In a possible design, the first sending unit is further configured to broadcast a message about 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 instruction message issued by an optical line terminal, where the instruction message carries wavelength information of at least one wavelength and the Indication information of whether an optical network unit decodes a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; a second precoding unit, configured to: if the indication information instructs the optical network unit to decode, Decoding of signals to be received on the downlink wavelength channel corresponding to at least one wavelength starts; if the instruction information indicates that the optical network unit does not decode, decoding of signals to be received on the downlink wavelength channel corresponding to the at least one wavelength stops being decoded .

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

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

In a possible design, the instruction message further includes time information for starting precoding or prohibiting precoding, and the optical network unit further includes: a second timing unit, configured to start timing after receiving the adjustment message, After the expected time is reached, decoding of signals to be received on the downlink wavelength channel corresponding to the at least one wavelength is started, or decoding of signals to be received on the downlink wavelength channel corresponding to the at least one wavelength is stopped.

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

In a possible design, the second receiving unit further receives an authorization message issued by the optical line terminal; the second control unit is further configured to perform an authentication on the uplink time slot identified by the authorization message. The signal to be transmitted on the uplink wavelength channel corresponding to the at least one wavelength is started to be encoded or adjusted from encoding to not encoding.

In a fifth aspect, an embodiment of the present application provides a passive optical network system. 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.

According to 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 configured to store a computer to execute an instruction; the processor is connected to the memory through the bus; when the device is When running, the processor executes the computer execution instructions stored in the memory, so that the apparatus executes the method of any one of the first aspect or the second aspect.

According to a seventh aspect, a computer storage medium is provided for storing computer software instructions, which includes a program for executing the method according to any one of the first aspect or the second aspect.

According to an eighth aspect, a computer program product is provided, which includes computer software instructions that can be loaded by a processor to execute a program such as the method of any one of the first aspect or the second aspect.

It can be understood that the protection topics are different between different embodiments, but specific implementation details can be referred to each other. Some protection topics do not specifically explain the implementation details, and can refer to other various topics.

In summary, the precoding function of each wavelength channel between the optical line terminal and the optical network unit in the embodiment of the present invention can be turned on and off at any time. Compared with the device of the corresponding category selected during the existing installation, the device is installed using this solution. No distinction is required at any time, and the precoding function can be switched as required after installation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 (a) is a schematic structural diagram of an existing GPON passive optical network system;

FIG. 1 (b) is a schematic structural diagram of an existing TWDM-PON passive optical network system;

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

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

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

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

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

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 ways

In order to make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be described clearly and completely in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Figures 1 (a) and 1 (b) are schematic diagrams of the structure of a GPON passive optical network system. The passive optical network system includes an optical line terminal OLT 110, multiple optical network units ONU 120, and the OLT 110 and ONU 120 are connected through an optical distribution network ODN130. The OLT 110 further includes a data processing module 111 and an optical module 112. The data processing module may also be referred to as a MAC module, which is used to manage and control the optical module 112. The ODN 130 further includes a backbone fiber 133, a first-stage splitter splitter 131, a first-stage branch optical fiber 134, a second-stage splitter 132, and a second-stage branch optical fiber 135. The ONU further includes an optical module 123 for receiving a downlink optical signal and sending an uplink optical signal.

FIG. 2 is a schematic structural diagram of a TWDM-PON passive optical network system. Among them, the TWDM-PON system includes one OLT 210, multiple ONUs 220, and ODN 230. The OLT 210 is connected to multiple ONUs 220 in a point-to-multipoint (P2MP) manner through the ODN 230. Multiple ONUs 220 share the optical transmission medium of ODN 230. The ODN 230 may include a backbone optical fiber 231, an optical power branching module 232, and a plurality of branch optical fibers 233. The optical power branching module 232 may be set at a remote node (Remote Node, RN). On the one hand, it is connected to the OLT 210 through the backbone fiber 231; on the other hand, it is connected to multiple ONUs 220 through multiple branch fibers 233. In the TWDM-PON system, the communication link between the OLT 210 and the multiple ONUs 220 may include multiple wavelength channels, and the multiple wavelength channels share the optical transmission medium of the ODN 230 through the WDM method. Each ONU220 can work in one of the wavelength channels of the TWDM-PON system, and each wavelength channel can carry one or more ONU220 services. In addition, ONU220s working in the same wavelength channel can share the wavelength channel through TDM. In FIG. 2, a TWDM-PON system having four wavelength channels is used as an example for description. 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 the convenience of description, 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 in FIG. 2, where each wavelength channel uses a pair of uplink and downlink wavelengths, respectively. For example, the upstream and downstream wavelengths of wavelength channel 1 can be λu1 and λd1, the upstream and downstream wavelengths of wavelength channel 2 can be λu2 and λd2, and the upstream and downstream wavelengths of wavelength channel 3 can be λu3 and λd3, respectively. The upstream and downstream wavelengths of the wavelength channel 4 may be λu4 and λd4, respectively. Each wavelength channel can have a corresponding wavelength channel identification (for example, the channel numbers of the above four wavelength channels can be 1, 2, 3, and 4 respectively), that is, the wavelength channel identification matches the upstream and downstream wavelengths of the identified wavelength channel. Relationship, OLT210 and ONU220 can learn the uplink wavelength and downlink wavelength of the wavelength channel according to the wavelength channel identification.

The OLT 210 may include an optical coupler 211, a first wavelength division multiplexer 212, a second wavelength division multiplexer 213, a plurality of downlink optical transmitters Tx1 to Tx4, a plurality of uplink optical receivers Rx1 to Rx4, and a processing module 214. Among them, multiple downlink optical transmitters Tx1 to Tx4 are connected to the optical coupler 211 through the first wavelength division multiplexer 212, and multiple uplink optical receivers Rx1 to Rx4 are connected to the optical coupler through the second wavelength division multiplexer 213. 211. The coupler 211 is further connected to the backbone optical fiber 231 of the ODN 230.

Multiple downlink optical transmitters Tx1 to Tx4 have different transmission wavelengths. Among them, each downlink optical transmitter Tx1 to Tx4 can correspond to one wavelength channel of the TWDM-PON system, such as multiple downlink optical transmitters Tx1 to Tx4. The emission wavelengths can be λd1 to λd4, respectively. The downlink optical transmitters Tx1 to Tx4 can transmit downlink data to the corresponding wavelength channel by using their emission wavelengths λd1 to λd4, respectively, so as to be received by the ONU 120 working in the corresponding wavelength channel. Correspondingly, the receiving wavelengths of multiple uplink optical receivers Rx1 to Rx4 may be different, and each of the uplink optical receivers Rx1 to Rx4 also corresponds to one wavelength channel of the TWDM-PON system, for example, multiple uplink optical The receiving wavelengths of the receivers Rx1 to Rx4 may be λu1 to λu4, respectively. The uplink optical receivers Rx1 to Rx4 can respectively use their receiving wavelengths λu1 to λu4 to receive uplink data sent by the ONU 220 operating in the corresponding wavelength channel.

The first wavelength-division multiplexer 212 is configured to perform wavelength-division multiplexing on the downlink data transmitted by multiple downlink optical transmitters Tx1 to Tx4 with wavelengths λd1 to λd4, and send the data to the backbone fiber of ODN230 through the optical coupler 211. 231, so as to provide downlink data to the ONU 220 through the ODN 230. In addition, the optical coupler 211 can also be used to provide uplink data from multiple ONUs 220 with wavelengths λu1 to λu4 to the second wavelength division multiplexer 213, and the second wavelength division multiplexer 213 can respectively provide wavelengths to λu1 The uplink data of ~ λu4 is demultiplexed to the uplink optical receivers Rx1 to Rx4 for data reception.

The processing module 214 may be a Media Access Control (MAC) module. On the one hand, it can specify a working wavelength channel for multiple ONU220s through wavelength negotiation, and according to the working wavelength channel of an ONU220, it will send to the ONU220 the The downlink data is provided to the downlink optical transmitters Tx1 to Tx4 corresponding to the wavelength channel, so that the downlink optical transmitters Tx1 to Tx4 transmit the downlink data to the corresponding wavelength channel. On the other hand, the processing module 214 can also perform uplink for each wavelength channel The dynamic bandwidth allocation (Dynamic Bandwidth Allocation, DBA) is used to allocate an uplink transmission time slot to the ONU 220 multiplexed to the same wavelength channel by TDM to authorize the ONU 220 to send uplink data through its corresponding wavelength channel at the specified time slot.

The uplink transmit wavelength and downlink receive wavelength of each ONU220 are adjustable. The ONU220 can adjust its own uplink transmit wavelength and downlink receive wavelength to the uplink and downlink wavelengths of the wavelength channel respectively according to the wavelength channel specified by the OLT210, so as to achieve Send and receive uplink and downlink data through this wavelength channel.

The technical solutions of the embodiments of the present invention can be applied to various Ethernet passive optical networks (EPON) and Gigabit Passive Optical Networks (GPON), such as 10G EPON, single-wave 25G EPON, 2ⅹ25G EPON, single-wave 50G EPON, 2ⅹ50G EPON, and 100G EPON.

The signal processing method 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. The specific implementation of each step is as follows:

S200. After the ONU is successfully registered, the OLT sends a precoding information query request to the ONU.

An example of a query request message frame format is shown in Table 1:

Table I

字段Field	占用字节Occupied bytes
目的地址(Destination Address)Destination Address	66
源地址(Source Address)Source address	66
长度类型值(L/T)Length type value (L / T)	22
操作码(Opcode)Opcode	22
时间戳(Timestamp)Timestamp	44
保留(Reserved)Reserved	4040
帧校验序列(FCS)Frame Check Sequence (FCS)	44

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 indicate that the query message queries precoding information. Wherein, if the length type value (L / T) <0x600 is the length of the data field, if> = 0x600, it is the type of the control frame. In this embodiment, a value of 0x8808 is recommended.

S201. The ONU responds to the query request of the OLT, and reports decoding information and / or decoding capabilities and / or decoding functions of the signals to be received on each downlink wavelength channel. The reference configuration is disabled and enabled. The signal's precoding status and / or precoding capability and / or precoding disable and enable the reference configuration.

An example of the report message frame format is shown in Table 2 below:

Table II

字段Field	占用字节Occupied bytes
目的地址(Destination Address)Destination Address	66
源地址(Source Address)Source address	66
长度类型值(L/T)Length type value (L / T)	22
操作码(Opcode)Opcode	22
时间戳(Timestamp)Timestamp	44
控制标志Control flag	11
发现信息(Discovery Information)Discovery Information	22
激光开启时间Laser on time	11
激光关闭时间Laser off time	11
预编码状态Precoding status	11
预编码参数Precoding parameters	11
保留Keep	3232
帧校验序列(FCS)Frame Check Sequence (FCS)	44

An example of each bit in the Discovery Information field is shown in Table 3 below:

Table three

An example of the precoding status field is shown in Table 4 below:

Table four

An example of the precoding parameter fields is shown in Table 5 below:

Table five

S202. The OLT obtains the decoding information and / or decoding capability and / or decoding function of the signal to be received on each downlink wavelength channel reported by the ONU, and disables and enables the reference configuration, and the signal to be transmitted on each upstream wavelength channel. Precoding status and / or precoding capability and / or precoding disable and enable reference configuration.

S203. The OLT configures corresponding precoding configuration information for each signal to be transmitted on the downlink wavelength channel between the OLT and the ONU, and broadcasts the precoding configuration information downstream.

An example of the downlink broadcast message frame format is shown in Table 6 below:

Table six

字段Field	字节数(Octets)Bytes (Octets)
目的地址(Destination Address)Destination Address	66
源地址(Source Address)Source address	66
长度类型值(L/T)Length type value (L / T)	22
操作码(Opcode)Opcode	22
时间戳(Timestamp)Timestamp	44
通道配置Channel configuration	11
开始时间Starting time	44
Discovery Grant Length(EQ)Discovery Grant Length (EQ)	33
Sync TimeSync Time	22
Discovery InformationDiscoveryInformation	22

保留(Reserved)Reserved	2828
帧校验序列(FCS)Frame Check Sequence (FCS)	44

An example of each bit in the CHAssignment field is shown in Table 7 below:

Table seven

An example of each bit in the Discovery Information field is shown in Table 8 below:

Table eight

S204. The OLT sends an instruction message to the ONU. The instruction message carries wavelength information of at least one wavelength and indication information of whether the optical network unit decodes a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength.

The indication message may be sent periodically or triggered at a certain time as needed, and the encoding of one or more wavelength channels may be changed.

Examples of the fields and bytes included in this indication message are shown in Table 9 below, with only four downlink wavelength channels as an example:

Table nine

字段Field	字节byte
目的地址(destination address)Destination address	66
源地址(source address)Source address	66
长度类型值(L/T)Length type value (L / T)	22
操作码(Opcode)Opcode	22
时间戳(timestamp)Timestamp	44
通道配置(CH Assignment)Channel Configuration (CH Assignment)	11
通道1切换时间(Switch Time#1)Channel 1 Switch Time (Switch Time # 1)	44
通道2切换时间(Switch Time#2)Channel 2 switching time (Switch Time # 2)	44
通道3切换时间(Switch Time#3)Channel 3 switch time (Switch Time # 3)	44
通道4切换时间(Switch Time#4)Channel 4 switch time (Switch Time # 4)	44
保留字段reserved text	23twenty three
帧校验序列(FCS)Frame Check Sequence (FCS)	44

An example of each bit in the CHAssignment field is shown in Table 10 below:

Table ten

It can be seen that the value of each downlink wavelength channel is different, and there are multiple combinations. One instruction message may have different instructions between multiple wavelength channels.

S205, after the OLT sends the instruction message, a local timer is started to start counting, and when the switching time is reached, precoding is performed on a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength.

S206. After receiving the indication message, the ONU starts a local timer and starts counting. If the instruction instructs the optical network unit to decode, the timer is started after the instruction message is sent to the optical network unit, and after the switching time is reached, the to-be-sent on the downlink wavelength channel corresponding to the at least one wavelength The signal is pre-coded.

After the ONU receives the instruction message, if the instruction information instructs the optical network unit to decode, it starts to decode a signal to be received on the downlink wavelength channel corresponding to the at least one wavelength; if the instruction information indicates the The optical network unit does not decode, and stops decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength. For example, when the designated bit in the indication message is "0", it means that the optical line terminal has no precoding, and the ONU side does not need to decode; when the bit is "1", it means that the OLT side turns on the precoding, and instructs the ONU to perform at least one The signal to be received on the downlink wavelength channel corresponding to the wavelength starts to be decoded. The ONU can feedback the enable response information to the OLT, and the enable response information can be carried in the registration response message (Register_ACK) to inform the OLT whether the ONU decodes.

S207. The ONU receives a message indicating whether a signal to be sent on the uplink wavelength channel corresponding to each wavelength of the optical network unit broadcast by the OLT is pre-encoded.

S208: The ONU receives an authorization message delivered by the OLT that carries uplink precoding enabled or enabled, and encodes signals to be sent on the upstream wavelength channel in the uplink time slot identified by the authorization message or adjusts the encoding to not encoding. .

An example of the authorization message frame structure is shown in Table 11 below:

Table eleven

字段Field	字节byte
目的地址(destination address)Destination address	66
源地址(source address)Source address	66
长度类型值(L/T)Length type value (L / T)	22
操作码(Opcode)Opcode	22
时间戳(timestamp)Timestamp	44
通道配置(CH Assignment)Channel Configuration (CH Assignment)	11
开始时间(Start time)Start time	44
逻辑链路表示LLID#1Logical link indicates LLID # 1	22
Grant Length#1\|FR\|FGrant Length # 1 \| FR \| F	33
逻辑链路表示LLID#2Logical link indicates LLID # 2	22
Grant Length#2\|FR\|FGrant Length # 2 \| FR \| F	33
逻辑链路表示LLID#3Logical link indicates LLID # 3	22
Grant Length#3\|FR\|FGrant Length # 3 \| FR \| F	33
逻辑链路表示LLID#4Logical link indicates LLID # 4	22
Grant Length#4\|FR\|FGrant Length # 4 \| FR \| F	33
逻辑链路表示LLID#5Logical link representation LLID # 5	22
Grant Length#5\|FR\|FGrant Length # 5 \| FR \| F	33
逻辑链路表示LLID#6Logical link representation LLID # 6	22
Grant Length#6\|FR\|FGrant Length # 6 \| FR \| F	33
逻辑链路表示LLID#7Logical link representation LLID # 7	22
Grant Length#7\|FR\|FGrant Length # 7 \| FR \| F	33
保留字段reserved text	23twenty three
帧校验序列(FCS)Frame Check Sequence (FCS)	44

An example of each bit in the CHAssignment field is shown in Table 12 below:

Table 12

Among the various messages mentioned above, there are new messages defined in the embodiments of the present application that are not defined in the existing protocol, such as the message defined in step S201 above. Some are generated by adding fields based on the messages defined in the existing protocol, such as the messages defined in steps other than the above step S200.

In order to ensure that the OLT and ONU have the same precoding function settings in the uplink and downlink directions of different wavelength channels and ensure normal communication between the two parties, the OLT can query the ONU precoding related information at any time.

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

The generating unit 301 is configured to generate an instruction message.

The first sending unit 302 is configured to send an instruction message to an optical network unit, where the instruction message carries wavelength information and 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. Instructions.

The first precoding unit 303 is configured to start precoding a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength if the instruction information instructs the optical network unit to decode; if the instruction information indicates the If the optical network unit does not decode, the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength is not pre-coded.

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

The configuration unit 304 is configured to respectively configure corresponding precoding configuration information for a signal 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 downlink broadcast the precoding configuration information.

In other embodiments, as shown in FIG. 5, the optical line terminal further includes a first receiving unit 305. After the first sending unit 301 sends a precoding information query request to the optical network unit, the first receiving unit 305 obtains the optical The precoding is disabled or enabled for each downlink wavelength channel and uplink wavelength channel reported by the network unit, and / or the precoding capability and / or the precoding function is disabled and enabled for the reference configuration.

The OLT not only broadcasts the precoding disabled or enabled status of the downlink wavelength channel. For the uplink wavelength channel, the first sending unit 302 also broadcasts whether the signal to be sent on the uplink wavelength channel corresponding to each wavelength of the optical network unit is precoded. Message.

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

The first timing unit 306 is configured to start timing after sending the instruction message 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 a start switching 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 a message about whether a signal to be sent on the uplink wavelength channel corresponding to each wavelength of the optical network unit is precoded.

A second precoding unit 402, configured to start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength if the instruction information instructs the optical network unit to decode; if the instruction information indicates that If the optical network unit does not decode, it stops decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength.

Optionally, the second receiving unit 401 is further configured to receive a message indicating whether signals to be sent on all downlink wavelength channels broadcast by the optical line terminal are precoded.

Optionally, the second receiving unit 401 is further configured to receive a precoding information query request issued by an optical line terminal; and further includes a second sending unit configured to report a signal to be received on each downlink wavelength channel. Decoding information and / or decoding capability and / or decoding function disable and enable reference configuration, and precoding status and / or precoding capability and / or precoding disable and enable reference of signals to be sent on each uplink wavelength channel Configuration.

The OLT not only broadcasts the precoding disabled or enabled state of the downlink wavelength channel. For the uplink wavelength channel, the OLT also broadcasts a message whether the signal to be sent on the uplink wavelength channel corresponding to each wavelength of the optical network unit is precoded. Correspondingly, the second receiving unit 401 of the ONU also receives a message indicating whether the signal to be sent on the upstream wavelength channel corresponding to each wavelength of the optical network unit broadcasted by the optical line terminal is precoded. In one embodiment, the second receiving unit 401 further receives an authorization message issued by the OLT. The second precoding unit 402 is further configured to start coding or adjust coding to non-coding of a signal to be sent on an uplink wavelength channel in an uplink time slot identified by the authorization message.

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

The second timing unit 403 is configured to start timing after receiving the adjustment message, and after the expected time is reached, decoding of a signal to be received on the downlink wavelength channel corresponding to the at least one wavelength or decoding of the at least one wavelength The decoding of signals to be received on the downlink wavelength channel is stopped.

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

The processor 510 may use a general-purpose central processing unit (Central Processing Unit, CPU), a microprocessor, an application specific integrated circuit ASIC, or at least one integrated circuit for executing related programs to implement the technology provided by the embodiment of the present invention. Program.

The memory 520 may be a read-only memory (Read Only Memory, ROM), a static storage device, a dynamic storage device, or a random access memory (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, the 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 a memory 520 inside. In another embodiment, the processor 510 and the memory 520 are two separate structures.

The transceiver 540 may include a light transmitter and / or a light receiver. The optical transmitter can be used to send optical signals, and the optical receiver can be used to receive optical signals. The light transmitter can be realized by a light emitting device, such as a gas laser, a solid-state laser, a liquid laser, a semiconductor laser, a direct-tuning laser, and the like. The light receiver can be implemented by a light detector, such as a photodetector or a photodiode (such as an avalanche diode). The transceiver 540 may further include a digital-to-analog converter and an analog-to-digital converter.

The wavelength division multiplexer 850 is connected to the transceiver 540. When the network device sends an optical signal, the wavelength division multiplexer serves as a multiplexer. When a network device receives an optical signal, the wavelength division multiplexer acts as a demultiplexer. Wavelength division multiplexers can also be called optical couplers.

For more details when the processor 510 and the transceiver 530 execute the foregoing steps, reference may be made to related descriptions of the foregoing embodiments of the method and the accompanying drawings, and details are not described herein again.

The embodiments of the present invention also have various beneficial effects described in the foregoing method embodiments, and details 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 foregoing method shown in FIG. 2.

In addition, an embodiment of the present application provides a computer program product including computer software instructions, and the computer software instructions can be loaded by a processor to execute the program of the method shown in FIG. 2.

For more details of the above steps performed by each module of the device, reference may be made to related descriptions of the embodiments of the method and the accompanying drawings, and details are not described herein again.

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

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it 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 the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present invention are wholly or partially generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center. Transmission via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes one or more available medium integration. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.

In summary, the above are only embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

A method for processing a passive optical network signal, wherein the passive optical network includes an optical line terminal and an optical network unit, and the optical line terminal is connected to the optical network unit through multiple wavelength channels, and the optical line terminal is connected from the optical line. The direction from the terminal to the optical network unit is downlink, and the direction from the optical network unit to the optical line terminal is uplink, wherein the method includes:

Generate an instruction message, and deliver the instruction message to the optical network unit, where the instruction message carries wavelength information of at least one wavelength and the optical network unit to be received on a downlink wavelength channel corresponding to the at least one wavelength Information indicating whether the signal is decoded;

If the indication information instructs the optical network unit to decode, start precoding the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength; if the indication information indicates that the optical network unit does not decode, then The signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength is not pre-coded.
The method according to claim 1, wherein the indication message further comprises time information for starting adjustment of a precoding parameter;

If the instruction information instructs the optical network unit to decode, the timer is started after the instruction message is sent to the optical network unit, and a signal to be sent on the downlink wavelength channel corresponding to the at least one wavelength is reached after the start switching time is reached. Precoding.
The method of claim 1, further comprising:

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

Downlink precoding configuration information.
The method according to claim 1 or 2, wherein before the issuing the instruction message, the method further comprises:

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

Acquiring decoding information and / or decoding capability and / or a reference function for disabling and enabling a 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 corresponding to the at least one wavelength The reference configuration of the precoding status and / or precoding capability and / or precoding disable and enable of the signal to be transmitted on the uplink wavelength channel of.
The switching method according to any one of claims 1-4, further comprising:

A downlink broadcast message of whether the signal to be sent on the uplink wavelength channel corresponding to at least one wavelength of the optical network unit is precoded.
A method for processing a passive optical network signal, wherein the method includes:

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

If the indication information instructs the optical network unit to decode, start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; if the indication information indicates that the optical network unit does not decode, Signals to be received on the downlink wavelength channel corresponding to the at least one wavelength stop decoding.
The method according to claim 6, further comprising:

Receiving a message of whether a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength broadcast by the optical line terminal is precoded.
The method according to claim 6 or 7, further comprising:

Receiving a precoding information query request sent by an optical line terminal;

Report decoding information and / or decoding capability and / or decoding function of the signal to be received on the downlink wavelength channel corresponding to the at least one wavelength to disable and enable the reference configuration, and to be transmitted on the uplink wavelength channel corresponding to the at least one wavelength The precoding status and / or precoding capability and / or precoding disable and enable reference configuration of the signal.
The method according to claim 6, wherein the indication message further comprises time information for starting precoding or prohibiting precoding;

After receiving the adjustment message, the timer is started, and the signal to be received on the downstream wavelength channel corresponding to the at least one wavelength is decoded or the signal to be received on the downstream wavelength channel of the at least one wavelength is stopped after the expected time is reached. decoding.
The method according to any one of claims 6-9, further comprising:

Receiving a message of whether a signal to be sent on a uplink wavelength channel corresponding to the at least one wavelength of the optical network unit broadcasted by the optical line terminal is precoded.
The method according to claim 10, further comprising:

Receiving an authorization message issued by the optical line terminal, and in a uplink time slot identified by the authorization message, starting to encode a signal to be sent on an uplink wavelength channel corresponding to the at least one wavelength or adjusting the encoding to not encoding.
An optical line terminal, comprising:

A generating unit for generating an instruction message;

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

A first precoding unit, configured to start precoding a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength if the instruction information instructs the optical network unit to decode; if the instruction information indicates the If the optical network unit does not decode, the signal to be transmitted on the downlink wavelength channel corresponding to the at least one wavelength is not pre-coded.
The optical line terminal according to claim 12, further comprising:

A configuration unit, configured to respectively configure corresponding precoding configuration information for a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength;

The first sending unit is further configured to downlink broadcast the precoding configuration information.
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 an optical network unit;

The first receiving unit is configured to obtain a precoding disabled or enabled state and / or a precoding capability and / or a precoding of a downlink wavelength channel and an uplink wavelength channel corresponding to the at least one wavelength reported by the optical network unit. The function disables and enables the reference configuration.
The optical line terminal according to claim 12, wherein the instruction message further includes time information for starting precoding or prohibiting precoding, further comprising:

The first timing unit is configured to start timing after sending the instruction message to the optical network unit, and to pre-code a signal to be sent on a downlink wavelength channel corresponding to the at least one wavelength after a start switching time is reached.
The optical line terminal according to claim 12, wherein:

The first sending unit is further configured to broadcast a message about whether a signal to be sent on the uplink wavelength channel corresponding to the at least one wavelength of the optical network unit is precoded.
An optical network unit, comprising:

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

A second precoding unit, configured to: if the instruction information instructs the optical network unit to decode, start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength; if the instruction information indicates the The optical network unit does not decode, and stops decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength.
The optical network unit according to claim 17, wherein:

The second receiving unit is further configured to receive a message whether signals to be sent on all downlink wavelength channels broadcast by the optical line terminal are pre-encoded.
The optical network unit according to claim 17, wherein:

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 a decoding capability and / or a decoding function of a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength, and / or a reference configuration to disable and enable the reference configuration, and the at least one wavelength corresponding The reference configuration of the precoding status and / or precoding capability and / or precoding disable and enable of the signal to be transmitted on the uplink wavelength channel of.
The optical network unit according to claim 17, wherein the indication message further includes time information for starting precoding or prohibiting precoding, further comprising:

A second timing unit, configured to start timing after receiving the adjustment message, and to start decoding a signal to be received on a downlink wavelength channel corresponding to the at least one wavelength after the expected time is reached or to perform downlink decoding on the at least one wavelength The signal to be received on the wavelength channel stops decoding.
The optical network unit according to claim 17, wherein:

The second receiving unit further receives a message indicating whether a signal to be transmitted on the uplink wavelength channel corresponding to the at least one wavelength of the optical network unit broadcasted by the optical line terminal is pre-encoded.
The optical network unit according to claim 21, wherein:

The second receiving unit further receives an authorization message issued by the optical line terminal;

The second control unit is further configured to start coding or adjust the coding to be non-coding of a signal to be sent on an uplink wavelength channel corresponding to the at least one wavelength in an uplink time slot identified by the authorization message.
A passive optical network system, characterized in that the passive optical network system includes the optical line terminal according to any one of claims 12-16 and the optical network according to any one of claims 17-22. unit.
A network device is characterized in that it includes: a processor, a memory, a bus, and a communication interface; the memory is used to store computer execution instructions; the processor is connected to the memory through the bus; and when the device is running, the processor The computer execution instructions stored in the memory are executed to cause the apparatus to execute the method of any one of claims 1-5 or 6-11.
A computer storage medium, characterized in that it is used for storing computer software instructions, and comprises a program for executing the method according to any one of claims 1-5 or 6-11.
A computer program product, comprising computer software instructions, which can be loaded by a processor to execute a program according to any one of claims 1-5 or 6-11.