CN105264853B

CN105264853B - A kind of method, apparatus and system applied to passive optical network PON communication

Info

Publication number: CN105264853B
Application number: CN201480000093.6A
Authority: CN
Inventors: 叶飞; 彭桂开
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-03-19
Filing date: 2014-03-19
Publication date: 2018-11-13
Anticipated expiration: 2034-03-19
Also published as: CN105264853A; CN105981313A; CN105981313B; WO2015139412A1; WO2015139218A1

Abstract

The embodiment of the invention discloses a kind of PON systems for supporting multi-protocols ONU to register, including OLT and ONU, the OLT connects multiple ONU based on different MAC protocols, different rates by ODN, the OLT includes multiple MAC units, wherein, each MAC unit is used for the registration of the ONU based on different MAC protocols.By above technical scheme, when PON system faces upgrade requirement, without OLT device is needed to change, upgrade cost can be saved with smooth upgrade；Meanwhile supporting to increase bandwidth on demand, the utilization rate of ODN is high, saves resource.

Description

A kind of method, apparatus and system applied to passive optical network PON communication

Technical field

The present invention relates to technical field of network communication, and in particular to a kind of method, apparatus applied to passive optical network PON And system.

Background technology

Passive optical network（Passive Optical Network, PON）By the optical line terminal of office side（Optical Line Terminal, OLT）, user side optical network unit（Optical Network Unit, ONU）Or ONT Optical Network Terminal （Optical Network Terminal, ONT）And Optical Distribution Network（Optical Distribute Network, ODN） Composition.Currently, representative PON technologies are GPON（Gigabit-Capable Passive Optical Network, Gigabit Passive Optical Network）, EPON (Ethernet Passive Optical Network, Ethernet passive optical network), 10G- GPON（It is referred to as XG-PON）,10G-EPON.

OLT provides Network Side Interface, connection one or more ODN for PON system.ONU provides user side for PON system and connects Mouthful, it is connected with ODN.If ONU directly provides User Port Function, such as PC（Personal Computer, PC）Online Ethernet user port, then referred to as ONT.Without specified otherwise, the ONU systems being mentioned below refer to ONU and ONT.ODN is by optical fiber The network formed with passive optical splitters part, for connecting OLT device and ONU equipment, for distributing or being multiplexed between OLT and ONU Data-signal.In PON system, downlink is known as from OLT to ONU；Conversely, being uplink from ONU to OLT.

Orthogonal frequency division multiplexing passive optical network（Orthogonal Frequency Division Multiplexing- Passive Optical Network, OFDM-PON）It is a kind of passive optical network based on OFDM technology, as shown in Figure 1.By It needs to match in the MAC layer of OLT and ONU and use, and MAC layer can only support single agreement, as the ONU of GPON only supports GPON When agreement, the MAC layer of corresponding OLT can only support GPON agreements, and the OLT of 10G-EPON cannot be logical with the ONU of GPON or EPON Letter, and so on, when ONU only supports EPON agreements, the MAC layer of corresponding OLT can only support EPON agreements.Therefore, when existing Some PON systems need replacing OLT device in face of upgrade requirement when needing to support the ONU of a variety of different rates, different agreement, Upgrade cost is higher.

Invention content

In view of this, the embodiment of the present invention provide it is a kind of applied to passive optical network PON communication method method, apparatus and System, can solve above-mentioned when PON upgrades, and need replacing OLT device, the higher problem of cost.

In a first aspect, a kind of device applied to passive optical network PON, the PON includes optical line terminal OLT and multiple Optical network unit ONU carries data, described device between the OLT and the multiple ONU based on orthogonal frequency division multiplex OFDM Including：

Multiple PON media access control MACs modules, for coupling the physical layer block based on OFDM；

The multiple PON media access control MACs module includes the first PON MAC modules and the 2nd PONMAC modules, institute It is different to state the PON types that the first PON MAC modules and the 2nd PON MAC modules are supported, the PON types include MAC protocol and At least one of PON link rates；

It is logical that the first PON MAC modules are associated with the first OFDM that the physical layer block based on OFDM is supported Road；

It is logical that the 2nd PON MAC modules are associated with the 2nd OFDM that the physical layer block based on OFDM is supported Road, wherein OFDM that the OFDM subcarriers and the first OFDM subchannels that the 2nd OFDM subchannels include include carry Wave is different.

With reference to first aspect, further include parameter interface module in the first possible realization method of first aspect, use OFDM sub-channel informations are transmitted between the first ONU in OLT and the multiple ONU.

The possible realization method of with reference to first aspect the first, in second of possible realization method of first aspect In, OFDM sub-channel informations that the parameter interface module is transmitted include the OLT distribute to the first ONU the first OFDM it is logical The channel information in road, the PON types that the first ONU is supported and the associated first PON MAC moulds of the first OFDM subchannels The PON types of block are consistent.

Second of possible realization method with reference to first aspect, in the third possible realization method of first aspect In, the OLT is at least one when meeting in the following conditions, and the first OFDM subchannels of distribution give the first ONU：

The OFDM subchannels that first ONU is supported are matched with the subchannel that the first OFDM subchannels include；First ONU is propped up The spectral range held is matched with the spectral range of the first OFDM subchannels；The PON types that first ONU is supported are logical with the first OFDM The PON types of the associated first PON MAC modules in road are consistent；And the first OFDM subchannels bandwidth capacity meet the first ONU Bandwidth demand.

With reference to first aspect the first is to any one possible realization method in the third, the of first aspect In four kinds of possible realization methods, the parameter interface module is used for by being based on described in physical layer negotiation process transmission The channel information for multiple OFDM subchannels that the physical layer block of OFDM is supported.

Any one possible realization method in reference to first aspect the first to the 4th kind, the of first aspect In five kinds of possible realization methods, the OFDM sub-channel informations include in OFDM gap markers and OFDM subcarrier informations extremely Few one kind.

With reference to first aspect and first aspect the first to any one possible realization method in the 5th kind, Further include management module in 6th kind of possible realization method of first aspect, the association for establishing ONU and OFDM subchannels Relationship includes the incidence relation of the first ONU and the first OFDM subchannels.

The 6th kind of possible realization method with reference to first aspect, in the 7th kind of possible realization method of first aspect In, the incidence relation indicates the relationship of the channel information of ONU marks and OFDM subchannels.

With reference to first aspect and first aspect the first to any one possible realization method in the 7th kind In 8th kind of possible realization method of one side, the first OFDM subchannels and the 2nd OFDM subchannels are downlink Channel.

With reference to first aspect and first aspect the first to any one possible realization method in the 8th kind In 9th kind of possible realization method of one side, the multiple PON media access control MACs module is one of the OLT Subassembly.

Second aspect, a kind of optical line terminal OLT are applied to PON network, and the PON includes the OLT and multiple light nets Network unit ONU；Data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, the OLT includes Multiple PON MAC modules and the physical layer block based on OFDM,

Wherein, the multiple PON MAC modules are any one possible realization side such as first aspect or first aspect Device described in formula；

The physical layer block based on OFDM is used to transmit the number of the first PON MAC modules by the first OFDM subchannels According to；The data of the 2nd PON MAC modules are transmitted by the 2nd OFDM subchannels.

In conjunction with second aspect, in the first possible realization method of second aspect, the physical layer block, for leading to The data that the first OFDM subchannels transmit the first PON MAC modules are crossed, the 2nd PON MAC moulds are transmitted by the 2nd OFDM subchannels The data of block, including：

Physical medium relating module PMD modules, the number for receiving the first PON MAC modules by the first OFDM subchannels According to, and it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated to OFDM Signal；

Digital analog converter, for the ofdm signal to be converted to analog electrical signal；

Optical sender：For the analog electrical signal to be converted to optical signal, by the optical signal launch to optical distribution network Network ODN；

MAC adaptation modules lead to the 2nd OFDM for the first OFDM subchannels to be associated with the first PON MAC modules Road is associated with the 2nd PON MAC modules.

The third aspect, a kind of passive optical network PON system, including optical line terminal OLT and multiple optical network unit ONUs； Data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU；The OLT is such as second aspect And the OLT described in second aspect any one possible realization method.

Fourth aspect, a kind of communication means applied to PON, the PON include optical line terminal OLT and multiple optical-fiber networks Unit ONU carries data between the OLT and the multiple ONU based on orthogonal frequency division multiplex OFDM, the method includes：

The OLT sends the data information based on the first MAC protocol by the first OFDM downlinks subchannel to the first ONU, The OLT sends the data information based on the second MAC protocol by the 2nd OFDM downlinks subchannel to the 2nd ONU, wherein described The subcarrier that the OFDM subcarriers that first OFDM subchannels include and the 2nd OFDM subchannels are included is different.

In conjunction with fourth aspect, in the first possible realization method of fourth aspect, the OLT is to the first ONU Send OFDM sub-channel informations.

In conjunction with fourth aspect, in second of possible realization method of fourth aspect, the OLT in the following conditions extremely Few one when meeting, the first OFDM subchannels of distribution give the first ONU：The OFDM subchannels and the first OFDM that first ONU is supported The subchannel matching that subchannel includes；The spectral range that first ONU is supported is matched with the spectral range of the first OFDM subchannels； The PON types that first ONU is supported are consistent with the associated PON types of first PON MAC modules of the first OFDM subchannels；And the The bandwidth capacity of one OFDM subchannels meets the bandwidth demand of the first ONU.

In conjunction with the first or second of possible realization method of fourth aspect and fourth aspect, the OLT is to the first ONU Send the first upgoing O FDM sub-channel informations that the OLT distributes to the first ONU.

In conjunction with the possible realization method of any one of fourth aspect and fourth aspect, the OFDM sub-channel informations include At least one of OFDM gap markers and OFDM subcarrier informations.

5th aspect, a kind of register method of ONU, be applied to PON network in, the PON include optical line terminal OLT and Multiple optical network unit ONUs；Data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, it is described Method includes：

The OLT sends login request message by the first OFDM subchannels with the first MAC protocol；

The OLT sends login request message by the 2nd OFDM subchannels with the second MAC protocol, wherein the first OFDM The OFDM subcarriers that the OFDM subcarriers that subchannel includes include with the first OFDM subchannels are different；The first MAC associations View for the first associated MAC protocol of OFDM subchannels, second MAC protocol be and the 2nd associated MAC of OFDM subchannels Agreement, and first MAC protocol is different from second MAC protocol；

The OLT receives the registration request response message from ONU, judges whether the ONU is legal, is if legal The ONU distribution ONU marks, carry out ranging to the ONU, OFDM subchannels are distributed for the ONU, establish ONU marks and institute State the association of OFDM subchannels.

In conjunction with the 5th aspect, in the first possible realization method of the 5th aspect, OLT is on the first OFDM subchannels It is sent and the first relevant physical layer configuration parameter of OFDM subchannels with the first MAC protocol；

OLT is matched with the transmission of the second MAC protocol with the 2nd relevant physical layer of OFDM subchannels on the 2nd OFDM subchannels Parameter is set, wherein the physical layer configuration parameter includes at least one of OFDM gap markers and OFDM subcarrier informations.

In conjunction with the 5th aspect, in second of possible realization method of the 5th aspect, it is logical to distribute OFDM for the ONU Road, including：

OFDM subchannels are distributed for the ONU, including：

The OLT is at least one when meeting in the following conditions, and the 3rd OFDM subchannels of distribution give the first ONU：

The OFDM subchannels that first ONU is supported are matched with the subchannel that the 3rd OFDM subchannels include；First ONU is propped up The spectral range held is matched with the spectral range of the 3rd OFDM subchannels；The PON types that first ONU is supported are logical with the 3rd OFDM The PON types of the associated first PON MAC modules in road are consistent；And the 3rd OFDM subchannels bandwidth capacity meet the first ONU Bandwidth demand.

In conjunction with second of possible realization method of the 5th aspect, in the third possible realization method of the 5th aspect In, the method further includes：

When the 3rd OFDM subchannels are different from the first OFDM subchannels, the OLT carries out the ONU second Ranging.

In conjunction with the third possible realization method of the 5th aspect, in the 4th kind of possible realization method of the 5th aspect In, the method further includes：

After OLT is that the ONU distributes new OFDM subchannels, the bit carrying table of acquiescence is issued the ONU by OLT.

In conjunction with the 4th kind of possible realization method of the 5th aspect, in the 5th kind of possible realization method of the 5th aspect In, the method further includes：

The OLT issues downlink training sequence to the ONU by the 3rd OFDM downlink subchannels；

The OLT receives the downstream bits value of the ONU by the 3rd OFDM downlink subchannels, generates the update Bit carrying table and newer bit carrying table is issued into the ONU；

The OLT carries out third time ranging to the ONU.

6th aspect, a kind of OLT, including：

Memory, the mapping relation information for preserving each the downlink subchannel and MAC protocol；

First media access control MAC module is asked for passing through the first OFDM subchannels with the transmission registration of the first MAC protocol Seek message；The registration request response message from the first ONU is received, judges whether the first ONU is legal, is described if legal First ONU distributes ONU marks；Ranging is carried out to the first ONU, OFDM subchannels are distributed for the first ONU；

Second MAC module, for sending login request message by the 2nd OFDM subchannels with the second MAC protocol；It receives Registration request response message from the 2nd ONU judges whether the 2nd ONU is legal, is distributed for the 2nd ONU if legal ONU is identified；Ranging is carried out to the 2nd ONU, OFDM subchannels are distributed to the 2nd ONU；

Wherein, OFDM that the OFDM subcarriers and the first OFDM subchannels that the first OFDM subchannels include include carry Wave is different；First MAC protocol is to be and second with the first associated MAC protocol of OFDM subchannels, second MAC protocol The associated MAC protocol of OFDM subchannels, and first MAC protocol is different from second MAC protocol；

Physical medium is associated with PMD modules, for the first OFDM subchannels to be associated with the first PON MAC modules, second OFDM subchannels are associated with the 2nd PON MAC modules；Down direction receives the first PON MAC moulds by the first OFDM subchannels The data of block, and it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated For ofdm signal；

MAC adaptation modules, one end are coupling in the PMD modules, one end and first MAC module and/or the 2nd MAC moulds Block couples, for when receiving ONU uplink optical signals, according to bandwidth allocation bitmap BWmap, the PMD modules to be demodulated Ofdm signal is sent to the first MAC module or the second MAC module.

In the first possible realization method of the 6th aspect, first MAC module is additionally operable to through the first OFDM Subchannel is sent and the first relevant physical layer configuration parameter of OFDM subchannels with the first MAC protocol.

In second of possible realization method of the 6th aspect, first MAC module, for being distributed for the first ONU Downlink subchannel, specifically includes：

When the spectral range that ONU types are supported and the first OFDM subchannels mismatch；Alternatively, ONU types with it is described The MAC protocol of first OFDM subchannels carrying mismatches；Alternatively, the bandwidth capacity of the first OFDM subchannels fails satisfaction The bandwidth demand of one ONU, the 3rd OFDM subchannels of distribution give the first ONU, wherein the 3rd OFDM subchannels meet the following conditions：

The spectral range that first ONU is supported is matched with the spectral range of the 3rd OFDM subchannels；What the first ONU was supported PON types are consistent with the associated PON types of first PON MAC modules of the 3rd OFDM subchannels；And the 3rd OFDM subchannels Bandwidth capacity meet the first ONU bandwidth demand.

In the third possible realization method of the 6th aspect, first MAC module is additionally operable to as OLT be described After first ONU is assigned with the 3rd OFDM subchannels, second of ranging is carried out to the first ONU.

In the 4th kind of possible realization method of the 6th aspect, first MAC module is additionally operable to update as OLT Bit carrying table be sent to the ONU after, to the first ONU carry out third time ranging.

7th aspect, a kind of optical line terminal OLT, including：Processor, memory, bus and communication interface；The storage Device is for storing computer executed instructions, and the processor is connect with the memory by the bus, when the computer When operation, the processor executes the computer executed instructions of the memory storage, so that the computer executes such as Method described in any one possible realization method of 5th aspect and the 5th aspect.

The present invention proposes a kind of novel PON system, equipment and the method for supporting multi-protocols ONU registrations, when PON system face When to upgrade requirement, without OLT device is needed to change, upgrade cost can be saved with smooth upgrade.

Description of the drawings

It, below will be to describing background in order to illustrate more clearly of the embodiment of the present invention or technical solution in the prior art Used attached drawing is briefly described when technology and embodiment.It should be evident that only this hair described in following accompanying drawings Bright a part of the embodiment for those of ordinary skill in the art without creative efforts, can be with Obtain other attached drawings or embodiment with description according to these attached drawings, and the present invention is directed to cover attached drawings derived from all these or Embodiment.

Fig. 1 is PON network configuration diagram；

Fig. 2 a are a kind of apparatus module structure charts applied to passive optical network PON that the embodiment of the present invention one provides；

Fig. 2 b are the apparatus module structure charts that the another kind that the embodiment of the present invention one provides is applied to passive optical network PON；

Fig. 3 is that second embodiment of the present invention provides a kind of structural schematic diagrams of optical line terminal OLT；

Fig. 4 is a kind of structural schematic diagram for passive optical network PON that the embodiment of the present invention three provides；

Fig. 5 is a kind of ONU structural schematic diagrams that the embodiment of the present invention three provides；

Fig. 6 is the structural schematic diagram for another ONU that the embodiment of the present invention three provides；

Fig. 7 is a kind of communication means flow chart applied to PON that the embodiment of the present invention four provides；

Fig. 8 is a kind of method flow diagram for ONU registrations that the embodiment of the present invention five provides；

Fig. 9 a are the method flow diagrams for another ONU registrations that the embodiment of the present invention five provides；

Fig. 9 b are a kind of interaction schematic diagrames for ONU registrations that the embodiment of the present invention five provides；

Fig. 9 c are another ONU registration interaction schematic diagrames that the embodiment of the present invention five provides；

Fig. 9 d are another ONU registration interaction schematic diagrames that the embodiment of the present invention five provides；

Figure 10 is a kind of structural schematic diagram for optical line terminal OLT that the embodiment of the present invention six provides；

Figure 11 is a kind of structural schematic diagram for optical line terminal OLT that the embodiment of the present invention seven provides.

Specific implementation mode

In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts Every other embodiment, shall fall within the protection scope of the present invention.

Embodiment one

Orthogonal frequency division multiplexing passive optical network（Orthogonal Frequency Division Multiplexing, OFDM-PON）It is a kind of passive optical network based on OFDM technology.OFDM technology belongs to multi-carrier modulation technology, its basic think of Want the subchannel that channel is divided into several frequency orthogonals, high-speed data signal is converted into parallel low speed sub-data flow, adjusts It makes and is transmitted on each subchannel.In OFDM-PON systems, uplink and downlink direction only has 1 wavelength.In downlink side To the MAC of OLT（Media Access Control, media access control）Module, for realizing ONU management, DBA （Dynamic Bandwidth Allocation, Dynamic Bandwidth Allocation）, ONU registrations activation, the functions such as data transmit-receive；Physical layer Including PMD（Physical Medium Dependent, physical medium associated layers）,DAC（Digital-to-Analog Converter, digital analog converter）ADC (Analog-to-Digital Converter, analog-digital converter), optical sender, light The hardware devices such as receiver, wherein PMD modules are used to the data that MAC module exports being modulated into ofdm signal, and DAC is used for will The ofdm signal of numeric field is converted to the electric signal of simulation, and optical sender Tx is emitted to for converting electrical signals to optical signal Optical Distribution Network ODN.Optical signal believes light for receiving optical signal through ODN network transmissions to ONU, the photoreceiver Rx of ONU Electric signal number is converted to, analog-digital converter ADC is used to analog electrical signal being converted to digital signal, and OFDM is realized by PMD modules The demodulation of signal handles the signal transmission after demodulation to MAC module.In up direction, the MAC module of ONU is for real The functions such as existing ONU management, DBA, data transmission, the functions of the modules such as PMD, DAC, Tx, Rx, ADC and down direction introduce class Seemingly, it repeats no more.

As shown in Figure 2 a and 2 b, the embodiment of the present invention discloses a kind of device 200 applied to passive optical network PON, institute It includes optical line terminal OLT and multiple optical network unit ONUs to state PON, based on orthogonal between the OLT and the multiple ONU Frequency division multiplex OFDM carries data, and described device includes：

The multiple PON media access control MACs module includes the first PON MAC modules and the 2nd PON MAC modules, institute It is different to state the PON types that the first PON MAC modules and the 2nd PON MAC modules are supported, the PON types include MAC protocol and At least one of PON link rates；

Optionally, the MAC protocol includes GPON agreements, EPON agreements, 10G-GPON agreements, 10G-EPON agreements, or The MAC protocol or Ethernet protocol of the higher transfer rates such as person 40G-PON, 100G-PON, CPRI（Common Public Radio Interface, public wireless electrical interface）,OBSAI（Open Base Station Architecture Initiative, open base station architecture agreement）Etc. one kind in MAC protocols.

Optionally, the first PON MAC modules and the 2nd PON MAC modules can integrate.

Optionally, the first OFDM subchannels and the 2nd OFDM subchannels are by down going channel by subcarrier grouping It divides.For example, downlink ofdm signal shares 1024 subcarriers, it is assumed that be divided into 4 subchannels, each subchannel occupies 256 The ID of a subcarrier, subchannel is respectively 0~3.

Optionally, the first OFDM subchannels and the 2nd OFDM subchannels are to believe down going channel by downlink OFDM Number frequency spectrum divide.For example, the frequency spectrum of downlink ofdm signal is 1GHz, it is assumed that be divided into 4 subchannels, each subchannel occupies The ID of the frequency spectrum resource of 250MHz, subchannel is respectively 0~3.

Optionally, described device further includes parameter interface module, in OLT and the multiple ONU the first ONU it Between transmit OFDM sub-channel informations.Wherein, the OFDM sub-channel informations include that the OLT distributes to the first ONU first The channel information of OFDM subchannels, the PON types that the first ONU is supported and the first OFDM subchannels associated first The PON types of PON MAC modules are consistent.For example, such as the first PON MAC modules support GPON agreements, the first OFDM GPON agreements, first ONU corresponding with the first OFDM subchannels is supported to support GPON agreements in channel；2nd PON MAC modules Support EPON agreements, the 2nd OFDM subchannels that EPON agreements, twoth ONU corresponding with the subchannel is supported to support EPON agreements.

Described device further includes：When meeting any one condition below, the first OFDM subchannels of distribution give the first ONU, The condition includes：

The spectral range that first ONU is supported is matched with the spectral range of the first OFDM subchannels；What the first ONU was supported PON types are consistent with the associated PON types of first PON MAC modules of the first OFDM subchannels；And the first OFDM subchannels Bandwidth capacity meet the first ONU bandwidth demand.

Optionally, the parameter interface module is used to transmit the object based on OFDM by the physical layer negotiation process Manage the channel information for multiple OFDM subchannels that layer module is supported.

Wherein, the OFDM sub-channel informations include at least one of OFDM gap markers and OFDM subcarrier informations.

Optionally, described device further includes management module, the incidence relation for establishing ONU and OFDM subchannels, including The incidence relation of first ONU and the first OFDM subchannels.The incidence relation illustrates the channel of ONU mark and OFDM subchannels The relationship of information.

Optionally, the first OFDM subchannels and the 2nd OFDM subchannels are downlink subchannel.

Optionally, the first OFDM subchannels and the 2nd OFDM subchannels are respectively upgoing O FDM subchannels under Row OFDM subchannels, or respectively downlink OFDM subchannels and upgoing O FDM subchannels.

Optionally, the multiple PON media access control MACs module is a part of component of the OLT.

The first PON MAC modules or the 2nd PON MAC modules, may be used field programmable gate array（Field- Programmable Gate Array, FPGA）, special integrated chip may be used（Application Specific Integrated Circuit, ASIC）, System on Chip/SoC can also be used（System on Chip, SoC）, in can also using Central processor（Central Processor Unit, CPU）, network processing unit can also be used（Network Processor, NP）, digital signal processing circuit can also be used（Digital Signal Processor, DSP）, microcontroller can also be used Device（Micro Controller Unit, MCU）, programmable controller can also be used（Programmable Logic Device, PLD）Or other integrated chips.

Embodiment two

The embodiment of the present invention discloses a kind of optical line terminal OLT, as shown in figure 3, it is applied to passive optical network PON, it is described PON includes the OLT and multiple optical network unit ONUs, and orthogonal frequency division multiplexing is based between the OLT and the multiple ONU OFDM carries data, and the OLT includes multiple PON MAC modules and the physical layer block based on OFDM.

Wherein, the PON MAC modules include the device as described in embodiment one；

The multiple PON MAC modules are coupled to the physical layer block based on OFDM, the physics based on OFDM Layer module is used to transmit the data of the first PON MAC modules by the first OFDM subchannels；It is transmitted by the 2nd OFDM subchannels The data of 2nd PON MAC modules.

Specifically, physical layer block includes：

Physical medium is associated with PMD modules, is used for down direction, and the first PON MAC moulds are received by the first OFDM subchannels The data of block, and it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated For ofdm signal；Up direction receives the digital base band OFDM signal that analog-digital converter is sent, and demodulate MAC to handle Data-signal.

It is worth noting that in OFDM-PON, ONU uplinks use time division multiple acess（Time Division Multiplexing Access, TDMA）Mode transmission data.OLT can distribute a small amount of bandwidth and report its bandwidth to need for ONU It asks, such as the length or size of its data buffer zone to be sent, OLT receives the bandwidth authorizing size of the rear accounting point counting dispensing ONU, And with bandwidth allocation bitmap（BandWidth Map, BWmap）Or other forms issue ONU, authorization by direction gives the uplink of the ONU It is sent out in corresponding ascending time slot according to the timing of BWmap after ONU receives BWmap with length information at the beginning of time slot Upstream data is sent to OLT by light.

Wherein, the PON MAC modules support the ONU of same MAC protocol to distribute for giving PON MAC respectively BWmap.For example support the MAC module of GPON agreements to supporting the ONU of GPON agreements to distribute BWmap, support the MAC of EPON agreements Module is to the ONU distribution BWmap for supporting EPON agreements.

Optical sender, for the analog electrical signal to be converted to optical signal, by the optical signal launch to optical distribution network Network ODN.

MAC adaptation modules, one end are coupling in each PON MAC modules, and one end is coupling in the PMD modules, is used for First OFDM subchannels are associated with the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC modules；When When receiving uplink optical signal, according to BWmap, determine that the moment sends the PON MAC modules corresponding to the ONU of signal, by PMD moulds The data-signal that block demodulates is sent to the corresponding PON MAC modules.

The physical layer block further includes analog-digital converter and photoreceiver, wherein photoreceiver is sent out for receiving from ONU The uplink optical signal sent, and convert optical signals to analog electrical signal；Analog-digital converter is for being converted to the analog electrical signal Digital signal is sent to PMD modules.

Embodiment three

The embodiment of the invention discloses a kind of passive optical network PONs, as shown in figure 4, include OLT and multiple ONU, it is described Data are carried based on orthogonal frequency division multiplex OFDM between OLT and the ONU, the OLT can support a variety of MAC protocols, such as 40G-PON, 100G-PON agreement of GPON, EPON, 10G-GPON or 10G-EPON and the higher rate of future development, or It is one or more in the MAC protocols such as person's Ethernet protocol, CPRI agreements, OBSAI.Correspondingly, the multiple ONU is supported A kind of agreement in the agreements such as GPON, EPON, 10G-GPON or 10G-EPON, Ethernet protocol, CPRI agreements, OBSAI, it is described In PON system, at least there are two kinds of MAC protocols.

In PON system described in Fig. 4, by down going channel by the frequency spectrum of downstream analog ofdm signal or by subcarrier point It is divided into 4 subchannels by taking 1GHz as an example for multiple subchannels, each subchannel occupies the frequency spectrum resource of 250MHz, subchannel ID can be 0~3.

Preferably, ONU similar in to-noise ratio SNR can be assigned to the same subchannel, the son where the higher ONU of SNR Channel can higher requirement modulate downlink signal, to improve the total bandwidth of down going channel.

Optionally, the ONU of GPON or EPON can select support 250MHz low frequency analog device and optical device, OLT or The ONU of 10G-GPON, 10G-EPON can select to support the frequency analog device and optical device of 1GHz frequency spectrums.

The OLT includes the OLT as described in implementing two；

The multiple ONU, for receiving downlink optical signal from the ODN, and by upstream data according to time division multiple acess TDMA Mode be transferred to OLT.

The ONU, specifically includes：

Photoreceiver, the optical signal for receiving ODN transmission, and be converted to analog electrical signal；

Analog-digital converter DAC, for analog electrical signal to be converted to digital baseband signal；

PMD modules form the manageable data-signal of MAC module for demodulating digital baseband signal；

MAC module, the data for receiving PMD modules, and handle.

It should be noted that the signal of frequency domain is converted to the signal of time domain by OLT when modulating ofdm signal；ONU is received When, time-domain signal is converted to the signal of frequency domain by demodulated ofdm signal.

Specifically, there are two types of example schemes for the hardware configuration of ONU, as shown in figure 5, the first, using what is directly detected Scheme, the ofdm signal of ONU fixed reception downstream spectrums, can be used for the realization of EPON, GPON, 10G-GPON, 10G-EPON Scheme.

Second, using the scheme of electrical domain coherent reception, as shown in fig. 6, adjusting local oscillator（Local Oscillator, LO） Frequency alignment downstream spectrum centre frequency, can receive the centre frequency subchannel consistent with the centre frequency OFDM believe Number, it can be used for the ONU implementations of EPON, GPON.

It should be noted that OLT needs to transmit the information of the corresponding subchannels of the first ONU in advance, such as the mark of subchannel The frequency range etc. of ID or subchannel receive signal in order to which the frequency of LO can be adjusted to the subchannel by the first ONU.Institute Informing in advance for stating can be that the incidence relation information of ONU and subchannel is sent to ONU by message, can also be by the association Relation information is configured to the locals ONU, can also use other modes in the prior art, which is not described herein again.

Direct detection scheme and electrical domain coherent reception scheme are the prior art, and details are not described herein again.

It is clear to describe, for example the ONU of GPON will be supported to be known as the first ONU, the ONU of EPON will be supported to be known as the 2nd ONU, The ONU of 10G-GPON is supported to be known as the 3rd ONU.

Ofdm signal is received using the first ONU that the first is directly detected, demodulates and extract the data of corresponding MAC Signal.According to embodiment one, the first PON MAC modules are associated with the first OFDM subchannels, and the first MAC protocol is GPON agreements, So ONU receives the data-signal of the first subchannel, i.e. the first subchannel and GPON protocol bindings.

Using the first ONU of second of electrical domain coherent reception, the frequency for adjusting LO is aligned with the centre frequency of downstream spectrum, The ofdm signal for the subchannel that can be aligned with the centre frequency with fixed reception, and demodulate data-signal.

Using the 3rd ONU of the first scheme, in order to realize the bandwidth of bigger, needs to support to receive and processing is all or more Multiple subchannels are bound a down going channel by the ofdm signal of a subchannel.

Example IV

The embodiment of the present invention discloses a kind of communication means applied to PON, and this method is applied to as described in embodiment three PON system, as shown in fig. 7, the PON includes optical line terminal OLT and multiple optical network unit ONUs, the OLT with it is described Data are carried based on orthogonal frequency division multiplex OFDM between multiple ONU, the method includes：

Optionally, the method further includes：

The OLT sends the first downlink OFDM sub-channel informations that the OLT distributes to the first ONU to the first ONU.

Optionally, the method further includes：

The OLT the following conditions are at least one meet when, distribution the first OFDM subchannels give the first ONU：First ONU institutes The spectral range of support is matched with the spectral range of the first OFDM subchannels；The PON types that first ONU is supported and the first OFDM The PON types of the associated first PON MAC modules in channel are consistent；And the first OFDM subchannels bandwidth capacity meet first The bandwidth demand of ONU.

Optionally, the method further includes：

The OFDM sub-channel informations include at least one of OFDM gap markers and OFDM subcarrier informations.

It should be noted that ONU uplinks are by the way of time division multiple acess TDMA.Realization process is as follows：

OLT is when doing OFDM modulation, by inverse Fourier transform method, the signal of frequency domain is converted to time domain, is sent to ONU；

ONU receiving terminals are to be received according to chronological order according to the subcarrier of different frequency, pass through Fourier Time-domain signal is converted to frequency-region signal by transform method, and each ONU receives corresponding data from corresponding OFDM subchannels.On When row, OLT is reported to according to time division multiple acess TDMA modes.

Uplink is only there are one wavelength, and the ONU of different MAC protocols accesses OLT in a manner of TDMA, and the PMD modules of OLT demodulate There are two types of methods for row ofdm signal：First, according to BWmap（Bandwidth Map, bandwidth allocation bitmap）Information switching demodulation ginseng Number（Such as uplink B tables, equalizing coefficient table）, the upstream data of corresponding ONU is demodulated, PON corresponding with the ONU is then forwarded to MAC module（Forwarding capability can also be realized by the MAC adaptation modules of MAC layer）；Second is that all ONU uplinks use identical demodulation Parameter demodulates upstream data, and PON corresponding with the ONU is forwarded to according to BWmap information in the MAC adaptation modules of MAC layer MAC module.

Specifically, BWmap includes the description information of ONU ascending time slots, and BWmap issues ONU by OLT, and OLT can also root It adjusts pmd layer parameter in advance according to BWmap and carries out the preparation for receiving upstream data；In addition, correspondence can be got by Alloc-ID ONU-ID, uplink data frames include ONU-ID, can compare ONU-ID fields after MAC receives upstream data, detection two Whether person is consistent, and the receiving time that can also compare ONU upstream datas judges ONU with authorizing the time whether consistent in BWmap Timing it is whether normal.This scheme is the prior art, and which is not described herein again.

Embodiment five

Fig. 8 shows a kind of method flow diagram of ONU registrations provided in an embodiment of the present invention, is applied in PON network, institute It includes optical line terminal OLT and multiple optical network unit ONUs to state PON network；It is based between the OLT and the multiple ONU Orthogonal frequency division multiplex OFDM carries data, as shown in figure 8, the method includes：

S800, the OLT send login request message by the first OFDM subchannels with the first MAC protocol；

S802, the OLT send login request message by the 2nd OFDM subchannels with the second MAC protocol, wherein first The OFDM subcarriers that the OFDM subcarriers that OFDM subchannels include include with the first OFDM subchannels are different；

S804, the OLT receive the registration request response message from ONU, to be judged as that legal ONU distributes ONU marks Knowledge and OFDM subchannels establish the ONU marks of distribution and being associated with for OFDM subchannels.OLT judges according to the sequence number of ONU should Whether ONU is legal ONU.

Optionally, the method further includes：OLT is sent and first on the first OFDM subchannels with the first MAC protocol The relevant physical layer configuration parameter of OFDM subchannels；

Specifically, it is ONU distribution OFDM subchannels, including：

When the spectral range that ONU types are supported and the first OFDM subchannels mismatch；Alternatively, ONU types with it is described The MAC protocol of first OFDM subchannels carrying mismatches；Alternatively, the bandwidth capacity of the first OFDM subchannels fails satisfaction When the bandwidth demand of one ONU, the 3rd OFDM subchannels of distribution give the first ONU, wherein the 3rd OFDM subchannels meet the following conditions One of：

It should be noted that carrying the sequence number of ONU in the registration response request message of ONU, the class of ONU can also be carried Type；ONU can also individually report ONU types by other message, such as physical layer operations management service（Physics Layer Operation Administration Management, PLOAM）Message.

The method further includes that the OLT is that the ONU distributes the 3rd OFDM downlink subchannels, when the 3rd OFDM When channel is different from the first OFDM subchannels, the OLT carries out second of ranging to the ONU.

Wherein, the downlink subchannel that ONU receives registration message is ONU oneself selections, is not that OLT is distributed.If ONU The subchannel of oneself selection meets the principle of OLT allocation of downlink subchannels, then to the ONU, otherwise OLT formally distributes the subchannel Other downlink subchannels are distributed to the ONU.

Further, OLT distributes formal downlink subchannel principle and has：Whether the PON protocol types of subchannel are consistent, son is logical The bandwidth capacity in road whether meet ONU require, carrier ID it is whether consistent（There are kind of a scene, downlink subchannel and operator binding, Only the ONU of the operator could be accessed）, between downlink subchannel the considerations of load balancing, between subchannel the considerations of flow scheduling （Such as in order to energy saving, ONU is concentrated on into part downlink subchannel when ONU is less）Etc..

The method further includes after OLT is that the ONU distributes the 3rd OFDM subchannels, and the ONU is by newer downlink Bit carrying table is reported to the OLT.

It should be noted that OLT and ONU determines that the pmd layer running parameter of subchannel is the bit carrying table B by acquiescence Table or newer bit carrying table B tables are realized.

The technology for giving tacit consent to B tables is the prior art, and the related record that refer to the prior art, which is not described herein again.

Before newer downstream bits carrying table is reported to the OLT by the ONU, further include：The OLT passes through described 3rd OFDM downlink subchannels issue downlink training sequence to the ONU；The ONU passes through the 3rd OFDM downlink subchannels The downlink training sequence is received, and calculates and generates the newer downstream bits carrying table；The ONU by it is described it is newer under Row bit carrying table is sent to the OLT.

The method further includes after OLT is that the ONU distributes the 3rd OFDM subchannels, and the OLT is by newer uplink Bit carrying table is sent to the ONU.

Before newer upstream bits carrying table is sent to the ONU by the OLT, further include：The ONU sends uplink Training sequence is to the OLT；The OLT receives the uplink training sequence by the OFDM data feedback channels, and calculates generation The newer upstream bits carry table；The newer upstream bits carrying table is passed through downlink OFDM by the OLT Channel is sent to the ONU.

The method further includes that the OLT carries out third time ranging to the ONU.

With reference to specific application scenarios, the embodiment of the present invention is further described, Fig. 9 a are that the embodiment of the present invention carries A kind of ONU register methods flow chart supplied, Fig. 9 b, 9c, 9d are a kind of ONU register flow paths interactions provided in an embodiment of the present invention Figure, as shown in Fig. 9 a, 9b, 9c, 9d.

In the PON network, optical line terminal OLT passes through the multiple and different passive optical network of Optical Distribution Network ODN connections The optical network unit ONU of MAC protocol, optical line terminal OLT is equipped with M downlink subchannel and the mapping relations of N kind MAC protocols are believed Breath, wherein M, N are the integer more than or equal to 1.It is described to be equipped with, can be that the mapping relation information is stored in depositing for OLT On reservoir RAM or ROM, flash memory, register etc., it can also be and directly the mapping relation information is written in chip, it can be with It is to be arranged on the OLT using externally input mode by configuration order row or network management system.

S900, OLT obtain the correspondence of each the downlink subchannel and MAC protocol, wherein the first subchannel and the One MAC protocol corresponds to.

Wherein, the mapping relation information of the M downlink subchannel and MAC protocol, can be as shown in table 1 below：

The mapping table of table 1 downlink subchannel and MAC protocol

Subchannel ID	MAC protocol
		0	GPON
1	EPON
		2	10G-GPON
3	10G-EPON

As shown in table 1, the subchannel that ID is 0 is corresponded with GPON agreements, and the subchannel and EPON agreements that ID is 1 are one by one Corresponding, the subchannel that ID is 2 is corresponded with 10G-GPON agreements, and the subchannel that ID is 3 is corresponded with 10G-EPON agreements.

Further, the M downlink subchannel can be divided down going channel according to the frequency spectrum of downlink ofdm signal At multiple subchannels.In the present embodiment, by taking the frequency spectrum of ofdm signal is 1GHz as an example, it is assumed that be classified as 4 subchannels （It is of course also possible to be divided into other multiple subchannels）, each subchannel occupies the frequency spectrum resource of 250MHz, and 4 sons are logical The ID in road is respectively set to 0~3.

Further, it is assumed that the frequency spectrum of 1GHz can support the message transmission rate of 10Gbps.For GPON, usual downlink Message transmission rate is 2.5Gbps, higher uplink bit rate 1.25Gbps.For EPON, usual uplink and downlink data transmission Rate is 1.25Gbps, so G/E-PON（It is referred to as GPON and EPON）Less frequency spectrum resource only need to be occupied, it is assumed that be G/ The frequency spectrum of E-PON distribution is 250MHz.For 10G-GPON, usual downlink transmission data rate is 10Gbps, and upstream data passes Defeated rate is 2.5Gbps.Asymmetrical 10G-EPON, downlink transmission data rate 10Gbps, higher uplink bit rate are 1.25Gbps, therefore 10G-PON（It is referred to as the PON of downlink 10Gbps, including 10G-GPON and 10G-EPON）Downlink need The frequency spectrum of 1GHz.

Further, down going channel can be divided by the M downlink subchannel according to the frequency spectrum of downlink ofdm signal Multiple subchannels.In the present embodiment, by taking the frequency spectrum of ofdm signal is 1GHz as an example, it is assumed that be classified as 4 subchannels（When So, other multiple subchannels can also be divided into）, the ID of 4 subchannels is respectively set to 0~3.

The ONU of OLT and 10G-PON needs the frequency analog device and optical device that select to support 1GHz frequency spectrums, the simulation Device includes digital analog converter DAC and analog-digital converter ADC etc.；The optical device includes optical sender and photoreceiver.G/E- The ONU of PON can also use such ONU, then distribute the subchannel of respective bandwidth for it.

Preferably, according to above-mentioned downstream spectrum demand, the ONU of G/E-PON can select to support the low frequency of 250MHz frequency spectrums Analog device and optical device.For the ONU of the first scheme, the analog device includes low pass electrical filter and analog-digital converter ADC, digital analog converter DAC etc.；For the ONU of second scheme, the analog device include band logical electrical filter, local oscillator LO, Analog-digital converter ADC or IQ demodulator（In-phase and Quadrature Modulator）, digital analog converter DAC；It is described Optical device includes photoreceiver.

It is apparent that using preferred scheme, the ONU costs of G/E-PON can accomplish the cost of the ONU than 10G-PON more Low, therefore, the ONU of different PON selects suitable analog device and optical device, can be effectively reduced cost.

Step S901：The OLT sends login request message by the first OFDM subchannels with the first MAC protocol；

For ease of understanding, with the subchannel ID in table 1 be 0 corresponding GPON agreements be the first MAC protocol illustrate. OLT is by reading the mapping relation information in table 1, and according to the mapping relation information, first is issued by the ID subchannels for being 0 ONU login request messages are to the first ONU；Wherein, the first ONU is the ONU for supporting GPON agreements.

Specifically, the frame format of the first ONU login request messages may be used in GPON systems in the prior art, under OLT The frame format for sending out ONU login request messages, can also use other customized frame formats.About GPON systems in the prior art System, ONU login request message frame formats are the prior art, and which is not described herein again.

Further, OLT periodically start ONU registration processes, with the first MAC protocol send login request message it Before, it is normal that the first ONU can also be issued by acquiescence downstream bits carrying table by the first subchannel of the M subchannel Physical layer parameter needed for work describes message, and quiet window is opened in data feedback channel.

Step 902：The OLT sends login request message by the 2nd OFDM subchannels with the second MAC protocol；

For ease of understanding, with the subchannel ID in table 1 be 1 corresponding EPON agreements be the second MAC protocol illustrate. OLT is by reading the mapping relation information in table 1, and according to the mapping relation information, second is issued by the ID subchannels for being 1 ONU login request messages are to the 2nd ONU；Wherein, the 2nd ONU is the ONU for supporting EPON agreements.

Specifically, the frame format of the 2nd ONU login request messages may be used in EPON system in the prior art, under OLT The frame format for sending out ONU login request messages, can also use other customized frame formats.About EPON systems in the prior art System, ONU login request message frame formats are the prior art, and which is not described herein again.

Further, OLT is periodically starting ONU registration processes, is assisted with the 2nd MAC by giving tacit consent to downstream bits carrying table Before view sends login request message, the 2nd normal works of ONU can also be issued by the second subchannel of the M subchannel Physical layer parameter needed for making describes message, and quiet window is opened in data feedback channel.

As shown in 9b, wherein the first ONU（It is GPON ONU in figure）After the power is turned on, table is carried by giving tacit consent to downstream bits Its each downlink subchannel that can be supported is scanned, if can reach synchronous on downlink subchannel of one of which and correctly parse Downlink frame then illustrates that the MAC protocol that shown downlink subchannel is supported is consistent with the MAC protocol that the ONU is supported, described ONU can be using the downlink subchannel as interim downlink subchannel and renewal of registration flow, and the interim downlink subchannel is only It can be used to register, business datum cannot be transmitted.As shown in figure 9b, GPON ONU selections receive downlink frame and same on subchannel 0 Step.

Optionally, OLT issues the physical layer parameter needed for the first ONU normal works and describes message to the in step 900 One ONU, the first ONU are received after the physical layer parameter describes message, are described message according to the parameter and are configured, then receive institute The first ONU login request messages are stated, and the first ONU login request messages are responded, report sequence number SN.

Wherein, the physical layer parameter includes the centre frequency of downlink subchannel and sub-carrier number, uplink transmission power, silent Recognize modulation format, preamble length and pattern etc..

Optionally, the first ONU can also report ONU types to OLT, described to report ONU types be by reporting sequence Number SN message, reports together；It can individually be reported with a self-defined new message format.

The ONU types can be the hardware parameter information of ONU, the type coding of ONU or ONU equipment other parameters, institute State the letters such as frequency, uplink and downlink rate, the MAC protocol of support, the bandwidth that OLT can know that the ONU is supported according to the ONU types Breath.

Optionally, if the first ONU does not report ONU types to OLT, OLT can obtain the according to the sequence number SN The information such as frequency, uplink and downlink transmission rate, the MAC protocol of support, bandwidth that one ONU is supported.

Step 903：The OLT receives the registration request response message from ONU, judges whether the ONU is legal, if Legal is then that the ONU distributes ONU marks（It is referred to as ONU-ID）, ranging is carried out to the ONU, is distributed for the ONU Formal downlink subchannel establishes being associated with for ONU marks and the downlink subchannel.The formal downlink subchannel can not only be used In registration, business datum can also be transmitted.

Optionally, OLT records subchannel ID, ONU-ID and supports the mapping relation information of MAC protocol, updated table 1 For（If the ONU of EPON, 10G-EPON, 10G-GPON distribute ONU-ID not yet, at this time in one row of ONU marks, for sky, table 1 The state after all distribution ONU-ID is shown）：

The mapping table of table 1 downlink subchannel and MAC protocol

Subchannel ID	MAC protocol	ONU is identified
			0	GPON	ONU-ID=1
1	EPON	ONU-ID=2
			2	10G-GPON	ONU-ID=3
3	10G-EPON	ONU-ID=4

OLT by physical layer operations manage message (Physical Layer Operation And Management, PLOAM) or other customized broadcast messages, issue the physical layer parameter needed for the 2nd ONU normal works and describe message to the Two ONU, the 2nd ONU after the power is turned on, are received after the physical layer parameter describes message, describe message according to the parameter and carry out initialization to match It sets, then receives the 2nd ONU login request messages, and respond to the 2nd ONU login request messages, report sequence Number SN.

Optionally, the 2nd ONU can also report ONU types to OLT, described to report ONU types be by reporting sequence Number SN message, reports together；It can individually be reported with a self-defined new message format.The ONU types can be ONU Hardware parameter information, ONU type coding or ONU equipment other parameters, the OLT can know this according to the ONU types The information such as frequency, uplink and downlink rate, the MAC protocol of support, the bandwidth that ONU is supported.

Optionally, if the 2nd ONU does not report ONU types to OLT, OLT can obtain the according to the sequence number SN The information such as frequency, uplink, downlink transmission rate, the MAC protocol of support, bandwidth that two ONU are supported.

Specifically, after the response message of the first ONU login request messages of the OLT receptions from the first ONU, Whether legal verify the sequence number SN that the first ONU is reported, if legal, OLT is the first ONU the first ONU-ID of distribution, and will First ONU-ID is handed down to the first ONU；If illegal, OLT kicks the first ONU offline.

With reference to table 1, for example, OLT is received and to be reported come the ONU of self-supporting GPON agreements for 0 subchannel by ID SN, verify the SN it is legal after, by ONU-ID be 1 ONU-ID distribute to the ONU of support GPON agreements, conversely, verifying the SN It is illegal, then the ONU is kicked offline.

Wherein, if be legal ONU, can according in the prior art, will report it is that SN and OLT prestores or being pre-configured, Or SN that is being inputted by order line or being inputted by network management system is matched, if matching is consistent, which is legal ONU；Conversely, being illegal ONU.

After OLT is proved to be successful the SN that ONU is reported, OLT initiates first time ranging, is completed under the cooperation of ONU Ranging.

OLT is that ONU distributes formal downlink subchannel, and downlink subchannel ID is sent to ONU.

Wherein, if the interim subchannel that ONU is currently selected meets one of the following conditions, OLT is that ONU distributes another Downlink subchannel is as formal subchannel；Otherwise, OLT is somebody's turn to do using the interim subchannel as formal downlink subchannel assignment to ONU Condition is：

The spectral range that ONU types are supported is mismatched with current interim subchannel；Alternatively, ONU types and current interim son The MAC protocol of channel carrying mismatches；Alternatively, the bandwidth capacity of current subchannel does not meet the bandwidth demand of ONU.

Wherein, OLT is that ONU distributes another downlink subchannel as formal subchannel, is specifically included：

OLT will meet first OFDM subchannel assignment of ONU demands to ONU；Or, OLT will meet the multiple of ONU demands Any one in OFDM subchannels distributes to ONU；Or, OLT will meet an optimal OFDM subchannel assignment for ONU demands To ONU；Or OLT binds multiple downlink OFDM subchannel assignments to ONU.

As shown in figure 9b, current interim subchannel meets the needs of GPON ONU, the son that subchannel ID is 0 by OLT Channel allocation is to ONU.As is shown in fig. 9 c, current interim subchannel is unsatisfactory for the demand of GPON ONU, and subchannel ID is by OLT 3 subchannel assignment is to ONU.As shown in figure 9d, the ONU of XG-PON is larger to the bandwidth demand of subchannel, and ONU is in subchannel 1 It is synchronous on 2, when this two interim subchannels meet XG-PON ONU demands, OLT by subchannel ID be 1 and 2 subchannel After binding, XG-PON ONU are given as formal downlink subchannel assignment.

Step 904：When ONU downlink subchannels change, OLT initiates second of ranging.

Specifically, OLT is that ONU has redistributed downlink subchannel, the formal downlink subchannel of the distribution in step 904 May be different from subchannel ID interim before, therefore, when ONU downlink subchannels change, OLT needs second of ranging, or By calculating the distance measurement result for obtaining the ONU on new downlink subchannel, such as by identical ONU the distribution downlink The difference of the distance measurement result of subchannel and current subchannel calculates the distance measurement result of the ONU；Conversely, OLT need not be second Ranging.

Step 905：After ONU downlink subchannels change, OLT and ONU are it needs to be determined that the pmd layer work of subchannel is joined Number.

Usually, in OFDM-PON, OLT and ONU carry table B tables in registration process using the bit of acquiescence（Also may be used Referred to as bit map）It is communicated, and then determines pmd layer running parameter.Ofdm signal has multiple subcarriers in frequency domain, each Subcarrier is according to signal-to-noise ratio（Signal Noise Ratio, SNR）Characteristic, each clock can carry different bit numbers, That is B values, the B tables are the mapping tables of channel sub-carriers ID and B value.

Optionally, the method that OLT and ONU determines downlink B tables：OLT sends downlink training sequence to ONU, and ONU is according to reception The downlink training sequence calculate the signal-to-noise ratio of each subcarrier（Signal Noise Ratio, SNR）, further according to the SNR, meter Calculate the downlink B tables of the ONU.Calculated downlink B tables are reported to OLT by ONU, and OLT is configured according to the downlink B tables.

Optionally, the method that OLT and ONU determines uplink B tables：ONU sends uplink training sequence to OLT, and OLT is according to reception The uplink training sequence calculate the signal-to-noise ratio of each subcarrier（Signal Noise Ratio, SNR）, further according to the SNR, meter Calculate the uplink B tables of the OLT.Calculated uplink B tables are sent to ONU by OLT, and ONU is configured according to the uplink B values.

After one section of time delay, OLT and ONU synchronized update uplink and downlink B tables.One section of time delay, can be pre-configured with or Setting, can also be arranged in real time.

Step 906：OLT and ONU needs ranging again, i.e. third time ranging after updating uplink and downlink B tables.

The third time ranging is identical with Yi Ci, second of ranging process, and which is not described herein again.

OLT and ONU enter normal communication state.

Embodiment six

The embodiment of the invention discloses a kind of optical line terminal OLTs, and as shown in Figure 10, the OLT includes：

Memory 100, the correspondence for preserving each the downlink subchannel and MAC protocol, wherein the first son is logical Road is corresponding with the first MAC protocol；

First MAC module 101, for sending login request message by the first OFDM subchannels with the first MAC protocol；It connects The registration request response message from the first ONU is received, judges whether the first ONU is legal, is described first if legal ONU distributes ONU marks；Being associated with for ONU mark and OFDM subchannels is established, to the first ONU progress rangings；For the first ONU Distribute formal downlink subchannel；

Optionally, the first MAC module 101 is additionally operable to send and first with the first MAC protocol by the first OFDM subchannels The relevant physical layer configuration parameter of OFDM subchannels.

Optionally, first MAC module 101 is specifically included for distributing formal downlink subchannel for the first ONU：

When the spectral range that ONU types are supported and current interim subchannel（Current interim subchannel is the first OFDM Channel）It mismatches；Alternatively, ONU types and the MAC protocol of current interim subchannel carrying mismatch；Alternatively, current interim son When the bandwidth capacity in channel fails the bandwidth demand for meeting ONU, the 3rd OFDM subchannels of distribution give the first ONU；At this point, the third OFDM subchannels meet the following conditions：

When that can meet conditions above there are multiple OFDM subchannels, the principle of OLT distribution subchannels can be：

Optionally, first MAC module 101, be additionally operable to when OLT be the first ONU distribution formal downlink subchannel not When being same as current interim subchannel, second of ranging is carried out to the first ONU after redistributing OFDM subchannels for the first ONU.

Optionally, first MAC module 101 is additionally operable to as OLT be that the first ONU is assigned with formal OFDM Channel（The 3rd i.e. above-mentioned OFDM subchannels）Afterwards, newer upstream bits carrying table is sent to the ONU by the OLT.

Optionally, first MAC module 101 is additionally operable to carry out third to the first ONU after update bit carrying table Secondary ranging.

Second MAC module 102, for sending login request message by the 2nd OFDM subchannels with the second MAC protocol；It connects The registration request response message from the 2nd ONU is received, judges whether the 2nd ONU is legal, is described second if legal ONU distributes ONU marks；Ranging is carried out to the 2nd ONU；For the 2nd ONU allocation of downlink subchannels；

Optionally, the second MAC module 102 is additionally operable to send and second with the second MAC protocol by the 2nd OFDM subchannels The relevant physical layer configuration parameter of OFDM subchannels.

Second MAC module 102 is specifically included for being the 2nd ONU allocation of downlink subchannels：

When OLT in the following conditions it is at least one meet when, distribution the 2nd OFDM subchannels give the 2nd ONU：

The spectral range that 2nd ONU is supported is matched with the spectral range of the 2nd OFDM subchannels；What the 2nd ONU was supported PON types are consistent with the associated PON types of 2nd PON MAC modules of the 2nd OFDM subchannels；And the 2nd OFDM subchannels Bandwidth capacity meet the 2nd ONU bandwidth demand.

Optionally, second MAC module 102, be additionally operable to when OLT be the 2nd ONU distribution formal downlink subchannel not When being same as interim subchannel, second of ranging is carried out to the 2nd ONU after redistributing OFDM subchannels for the 2nd ONU.

Optionally, second MAC module 102 is additionally operable to as OLT be that the 2nd ONU is assigned with formal OFDM Behind channel, newer upstream bits carrying table is sent to the ONU by the OLT.

Optionally, second MAC module 102 is additionally operable to carry out third to the 2nd ONU after update bit carrying table Secondary ranging.

MAC adaptation modules 103, one end are coupling in PMD modules, one end and the first MAC module 101 and the second MAC module 102 Coupling, for the first OFDM subchannels to be associated with the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC module；The data-signal that PMD modules demodulate is sent to the first MAC moulds by the uplink optical signal for receiving ONU according to BWmap Block 101 or the second MAC module 102.

PMD modules 104 are used for down direction, and the data of the first PON MAC modules are received by the first OFDM subchannels, And it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated to OFDM letters Number；Up direction receives the digital base band OFDM signal that analog-digital converter is sent, and demodulates the manageable data letters of MAC Number；

Specific interactive process, reference can be made to the description of embodiment five, which is not described herein again.

First MAC module, 101 or second MAC module 102, may be used field programmable gate array（Field- Programmable Gate Array, FPGA）, special integrated chip may be used（Application Specific Integrated Circuit, ASIC）, System on Chip/SoC can also be used（System on Chip, SoC）, in can also using Central processor（Central Processor Unit, CPU）, network processing unit can also be used（Network Processor, NP）, digital signal processing circuit can also be used（Digital Signal Processor, DSP）, microcontroller can also be used Device（Micro Controller Unit, MCU）, programmable controller can also be used（Programmable Logic Device, PLD）Or other integrated chips.

Embodiment seven

The embodiment of the present invention discloses a kind of optical line terminal OLT, as shown in figure 11, including processor 1101, memory 1102, communication bus 1103 and communication interface 1104.Pass through communication between CPU1101, memory 1102 and communication interface 1104 Bus 1103 connects and completes mutual communication.

Processor 1101 may be single or multiple core central processing unit, be either specific integrated circuit or be by with It is set to the one or more integrated circuits for implementing the embodiment of the present invention.

Memory 1102 can be high-speed RAM memory, or nonvolatile memory（non-volatile memory）, such as flash memory flash or at least one magnetic disk storages.

Memory 1102 is used for computer executed instructions 1105.Specifically, may include in computer executed instructions 1105 Program code.

When computer is run, processor 1101 runs computer executed instructions 1105, can execute such as five institute of embodiment The method flow stated.

It, without OLT device is needed to change, can smoothly be risen by above technical scheme when PON system faces upgrade requirement Grade saves upgrade cost；Meanwhile supporting to increase bandwidth on demand, the utilization rate of ODN is high, saves resource.

It is only illustrated by taking G/E-PON and 10G-PON as an example in the embodiment of the present invention, but not limited to this, with network Evolution, it is possible that single pass 40G-PON, 100G-PON in network, also can technical solution using the present invention, Realize various protocols, a variety of rates ONU coexist, details are not described herein.

It will be recognized by those of ordinary skill in the art that the possibility realization method of various aspects of the invention or various aspects It can be embodied as system, method or computer program product.Therefore, each aspect of the present invention or various aspects Complete hardware embodiment, complete software embodiment (including firmware, resident software etc.) may be used in possible realization method, or The form of the embodiment of integration software and hardware aspect, collectively referred to herein as " circuit ", " module " or " system ".In addition, The form of computer program product, computer journey may be used in the possibility realization method of each aspect of the present invention or various aspects Sequence product refers to the computer readable program code of storage in computer-readable medium.

Computer-readable medium can be computer-readable signal media or computer readable storage medium.Computer can Read storage medium including but not limited to electronics, magnetism, optics, electromagnetism, infrared or semiconductor system, equipment either device or It is above-mentioned arbitrary appropriately combined, such as random access memory (RAM), read-only memory (ROM), the read-only storage of erasable programmable Device (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

Processor in computer reads the computer readable program code of storage in computer-readable medium so that place Reason device is able to carry out function action specified in the combination of each step or each step in flow charts；It generates and implements in block diagram Each piece or each piece of combination specified in function action device.

Computer readable program code can execute on the user's computer completely, part is held on the user's computer Row, as individual software package, part on the user's computer and part on the remote computer, or completely long-range It is executed on computer or server.It is also noted that in certain alternate embodiments, each step or frame in flow charts Each piece of function of indicating may not be occurred by the sequence indicated in figure in figure.For example, depending on involved function, show in succession Two steps or two blocks gone out may be actually executed substantially concurrently or these blocks sometimes may be by with opposite suitable Sequence executes.

Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

The foregoing is merely several embodiments of the present invention, those skilled in the art is according to can be with disclosed in application documents Various changes or modifications are carried out without departing from the spirit and scope of the present invention to the present invention.

Claims

1. a kind of device applied to passive optical network PON, the PON includes optical line terminal OLT and multiple optical network units ONU, which is characterized in that data, the dress are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU Set including：

The multiple PON media access control MACs module includes the first PON MAC modules and the 2nd PON MAC modules, and described the The PON types that one PON MAC modules and the 2nd PON MAC modules are supported are different, and the PON types include MAC protocol and PON chains At least one of road rate；

The first PON MAC modules are associated with the first OFDM subchannels that the physical layer block based on OFDM is supported；

The 2nd PON MAC modules are associated with the 2nd OFDM subchannels that the physical layer block based on OFDM is supported, Wherein, the OFDM subcarriers that the OFDM subcarriers and the first OFDM subchannels that the 2nd OFDM subchannels include include are not Together.

2. device as described in claim 1, which is characterized in that further include parameter interface module, in OLT and the multiple OFDM sub-channel informations are transmitted between the first ONU in ONU.

3. device as claimed in claim 2, which is characterized in that the OFDM sub-channel information packets that the parameter interface module is transmitted The channel information that the OLT distributes to the first OFDM subchannels of the first ONU is included, the PON types and institute that the first ONU is supported The PON types for stating the associated first PON MAC modules of the first OFDM subchannels are consistent.

4. device as claimed in claim 3, which is characterized in that the OLT is at least one when meeting in the following conditions, distribution First OFDM subchannels give the first ONU：

The OFDM subchannels that first ONU is supported are matched with the subchannel that the first OFDM subchannels include；What the first ONU was supported Spectral range is matched with the spectral range of the first OFDM subchannels；The PON types that first ONU is supported are closed with the first OFDM subchannels The PON types of first PON MAC modules of connection are consistent；And the first OFDM subchannels bandwidth capacity meet the first ONU band Wide demand.

5. the device as described in claim 2-4 any one, which is characterized in that the parameter interface module is used for by described Physical layer negotiation process transmits the channel information for multiple OFDM subchannels that the physical layer block based on OFDM is supported.

6. the device as described in claim 2-4 any one, which is characterized in that the OFDM sub-channel informations include OFDM logical At least one of road mark and OFDM subcarrier informations.

7. device according to any one of claims 1-4, which is characterized in that further include management module, for establish ONU and The incidence relation of OFDM subchannels includes the incidence relation of the first ONU and the first OFDM subchannels.

8. device as claimed in claim 7, which is characterized in that the incidence relation indicates ONU marks and OFDM subchannels The relationship of channel information.

9. device according to any one of claims 1-4, which is characterized in that the first OFDM subchannels and described second OFDM subchannels are downlink subchannel.

10. device according to any one of claims 1-4, which is characterized in that the multiple PON media access control MACs mould Block is a part of component of the OLT.

11. a kind of optical line terminal OLT is applied to PON network, the PON includes the OLT and multiple optical network unit ONUs； It is characterized in that, carrying data based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, the OLT includes Multiple PON MAC modules and the physical layer block based on OFDM,

Wherein, the multiple PON MAC modules are the device as described in claim 1-10；

The physical layer block based on OFDM is used to transmit the data of the first PON MAC modules by the first OFDM subchannels； The data of the 2nd PON MAC modules are transmitted by the 2nd OFDM subchannels.

12. OLT as claimed in claim 11, which is characterized in that the physical layer block, for passing through the first OFDM subchannels The data for transmitting the first PON MAC modules transmit the data of the 2nd PON MAC modules by the 2nd OFDM subchannels, including：

Physical medium relating module PMD modules, the data for receiving the first PON MAC modules by the first OFDM subchannels, And it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated to OFDM letters Number；

Optical sender：For the analog electrical signal to be converted to optical signal, by the optical signal launch to Optical Distribution Network ODN；

MAC adaptation modules close the 2nd OFDM subchannels for the first OFDM subchannels to be associated with the first PON MAC modules It is linked to the 2nd PON MAC modules.

13. a kind of passive optical network PON system, including optical line terminal OLT and multiple optical network unit ONUs；It is characterized in that, Data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU；The OLT is such as claim 11- OLT described in 12.

14. a kind of communication means applied to PON, the PON includes optical line terminal OLT and multiple optical network unit ONUs, It is characterized in that, data is carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, the method includes：

The OLT is sent to the first ONU of the first PON types of support by the first OFDM downlinks subchannel and is assisted based on the first MAC The data information of view, twoth ONU transmissions of the OLT by the 2nd OFDM downlinks subchannel to the 2nd PON types of support are based on The data information of second MAC protocol, wherein OFDM subcarriers and the 2nd OFDM that the first OFDM subchannels include The subcarrier that channel is included is different.

15. method as claimed in claim 14, further includes：

16. method as claimed in claim 15, which is characterized in that the OLT is at least one when meeting in the following conditions, point The first ONU is given with the first OFDM subchannels：

17. the method as described in claim 14-16 any one, further includes：The OLT sends OLT points described to the first ONU The first upgoing O FDM sub-channel informations of the first ONU of dispensing.

18. the method as described in claim 15-16 any one, which is characterized in that the OFDM sub-channel informations include At least one of OFDM gap markers and OFDM subcarrier informations.

19. a kind of register method of ONU is applied in PON network, the PON includes optical line terminal OLT and multiple optical-fiber networks Unit ONU；It is characterized in that, carrying data, institute based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU The method of stating includes：

The OLT sends login request message by the first downlink OFDM subchannels with the first MAC protocol；

The OLT sends login request message by the second downlink OFDM subchannels with the second MAC protocol, wherein the first downlink The OFDM subcarriers that the OFDM subcarriers that OFDM subchannels include include with the second downlink OFDM subchannels are different；

The OLT receives the registration request response message from ONU, to be judged as that legal ONU distributes ONU marks and OFDM The ONU marks of distribution and being associated with for OFDM subchannels are established in channel.

20. method as claimed in claim 19, which is characterized in that further include：

OLT is sent on the first OFDM subchannels with the first MAC protocol to join with the relevant physical layer configurations of the first OFDM subchannels Number；

OLT is sent on the 2nd OFDM subchannels with the second MAC protocol to join with the relevant physical layer configurations of the 2nd OFDM subchannels Number, wherein the physical layer configuration parameter includes at least one of OFDM gap markers and OFDM subcarrier informations.

21. method as claimed in claim 19, which is characterized in that OFDM subchannels are distributed for the ONU, including：

When the spectral range and the first OFDM subchannels that ONU types are supported mismatch；Alternatively, ONU types and the first OFDM The MAC protocol of subchannel carrying mismatches；Alternatively, the bandwidth capacity of the first OFDM subchannels fails to meet the first ONU's When bandwidth demand, the 3rd OFDM subchannels of distribution give the first ONU, wherein the 3rd OFDM subchannels meet one of the following conditions：

The spectral range that first ONU is supported is matched with the spectral range of the 3rd OFDM subchannels；The PON classes that first ONU is supported Type is consistent with the associated PON types of first PON MAC modules of the 3rd OFDM subchannels；And the 3rd OFDM subchannels bandwidth Capacity meets the bandwidth demand of the first ONU.

22. according to the method for claim 21, which is characterized in that the method further includes：

When the 3rd OFDM subchannels are different from the first OFDM subchannels, the OLT carries out second to the ONU and surveys Away from.

23. according to the method for claim 22, which is characterized in that the method further includes：

When OLT is that the ONU distributes the 3rd OFDM subchannels, the bit carrying table of acquiescence is issued the ONU by OLT.

24. according to the method for claim 22, which is characterized in that further include：

The OLT receives the downstream bits value of the ONU by the 3rd OFDM downlink subchannels, generates newer bit and holds Newer bit carrying table is simultaneously issued the ONU by load table；

The OLT carries out third time ranging to the ONU.

25. a kind of optical line terminal OLT, which is characterized in that including：

Memory, the mapping relation information for preserving each downlink subchannel and MAC protocol；

First media access control MAC module is disappeared for passing through the first OFDM subchannels with the first MAC protocol transmission registration request Breath；The registration request response message from the first ONU is received, judges whether the first ONU is legal, is described first if legal ONU distributes ONU marks；Ranging is carried out to the first ONU, OFDM subchannels are distributed for the first ONU；

Second MAC module, for sending login request message by the 2nd OFDM subchannels with the second MAC protocol；Reception comes from The registration request response message of 2nd ONU judges whether the 2nd ONU is legal, and ONU is distributed for the 2nd ONU if legal Mark；Ranging is carried out to the 2nd ONU, OFDM subchannels are distributed to the 2nd ONU；

Wherein, the OFDM subcarriers that the OFDM subcarriers and the 2nd OFDM subchannels that the first OFDM subchannels include include are not Together；First MAC protocol is to be and the 2nd OFDM with the first associated MAC protocol of OFDM subchannels, second MAC protocol The associated MAC protocol of subchannel, and first MAC protocol is different from second MAC protocol；

Physical medium is associated with PMD modules, is used for down direction, and the first PON MAC modules are received by the first OFDM subchannels Data, and it is modulated to ofdm signal；The data of the 2nd PON MAC modules are received by the 2nd OFDM subchannels, and are modulated to Ofdm signal；

MAC adaptation modules, one end are coupling in the PMD modules, and one end is coupled with first MAC module and the second MAC module, For the first OFDM subchannels to be associated with the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC moulds Block；When receiving ONU uplink optical signals, according to bandwidth allocation bitmap BWmap, the ofdm signal that the PMD modules are demodulated It is sent to the first MAC module or the second MAC module.

26. OLT according to claim 25, which is characterized in that first MAC module is additionally operable to through the first OFDM Subchannel is sent and the first relevant physical layer configuration parameter of OFDM subchannels with the first MAC protocol.

27. OLT according to claim 25, which is characterized in that first MAC module, for under the first ONU distribution Row subchannel, specifically includes：

When the spectral range that ONU types are supported and the first OFDM subchannels mismatch；Alternatively, ONU types and described first The MAC protocol of OFDM subchannels carrying mismatches；Alternatively, the bandwidth capacity of the first OFDM subchannels fails satisfaction first When the bandwidth demand of ONU, distribution the 3rd OFDM subchannels give the first ONU, wherein the 3rd OFDM subchannels meet the following conditions it One：

28. OLT according to claim 27, which is characterized in that first MAC module is additionally operable to when the 3rd OFDM When channel is different from the first OFDM subchannels, second of ranging is carried out to the first ONU.

29. the OLT according to claim 27 or 28, which is characterized in that the first MAC module is additionally operable to as OLT be described the After one ONU is assigned with the 3rd OFDM subchannels, newer upstream bits carrying table is sent to the ONU by the OLT.

30. OLT according to claim 29, which is characterized in that first MAC module is additionally operable to when OLT will be newer After bit carrying table is sent to the ONU, third time ranging is carried out to the first ONU.