CN105264853A

CN105264853A - Communication method, apparatus, and system for passive optical network (pon)

Info

Publication number: CN105264853A
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: 2016-01-20
Anticipated expiration: 2034-03-19
Also published as: WO2015139218A1; CN105981313A; CN105981313B; WO2015139412A1; CN105264853B

Abstract

Disclosed in the embodiments of the present invention is a PON system supporting multi-protocol ONU registration, comprising an OLT and ONUs, the OLT connecting by means of an ODN to a plurality of ONUs based on different MAC protocols and on different speeds, the OLT comprising a plurality of MAC units, wherein each MAC unit is used for registering ONUs based on different MAC protocols. By means of the present technical solution, when the PON system faces upgrade requirements, there is no need to replace the OLT devices; upgrade is smooth and upgrade costs are saved; in addition, the increase of bandwidth according to demand is supported, and the utilisation rate of the ODN is high, conserving resources

Description

Communication method, apparatus, and system for passive optical network (pon)

A kind of method communicated applied to passive optical network PON, apparatus and system technical field

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

Background technology

EPON (Passive Optical Network, PON) by optical line terminal (the Optical Line Terminal of office side, OLT), the optical network unit (Optical Network Unit, ONU) or ONT Optical Network Terminal of user side（Optical Network Terminal, ONT) and Optical Distribution Network（Optical Distribute Network, ODN) composition.At present, representative PON technologies are GPON (Gigabit-Capable Passive Optical Network, Gigabit Passive Optical Network）, EPON (Ethemet Passive Optical Network, Ethernet passive optical network), 10G-GPON (being referred to as XG-PON), 10G-EPON.

OLT provides Network Side Interface for PON system, connects one or more ODN.ONU provides user side interface for PON system, 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.The network that 0 DN is made up of optical fiber and passive optical splitters part, for connecting 0 LT equipment and ONU equipment, for distributing or being multiplexed the data-signal between OLT and ONU.It is referred to as descending from OLT to ONU in PON system；Conversely, to be up from ONU to OLT.

Orthogonal frequency division multiplexing passive optical network (Orthogonal Frequency Division Multiplexing-Passive Optical Network, OFDM-PON) is a kind of EPON based on OFDM technologies, as shown in Figure 1.Because OLT and ONU MAC layer need pairing to use, and MAC layer can only support single agreement, when ONU such as GPON only supports GPON agreements, corresponding OLT MAC layer can only support GPON agreements, 10G-EPON OLT can not communicate with GPON or EPON ONU, the like, when ONU only supports EPON agreements, corresponding OLT MAC layer can only support EPON agreements.Therefore, when Existing PON system is in face of upgrade requirement, it is necessary to support during the ONU of a variety of different rates, different agreement that upgrade cost is higher, it is necessary to change OLT device.

The content of the invention

In view of this, the embodiment of the present invention provide it is a kind of applied to passive optical network PON communicate method method, apparatus and system, can solve it is above-mentioned when PON upgrades, it is necessary to change OLT equipment, the problem of cost is higher.

First aspect, a kind of device applied to passive optical network PON, the PON includes optical line terminal OLT and multiple optical network unit ONUs, and data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, and described device includes：

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 PON MAC modules, the PON types that the first PON MAC modules and the 2nd PON MAC modules are supported are different, and the PON types include MAC protocol and at least one of PON link rates；

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 2nd OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included.

With reference in a first aspect, in the first possible implementation of first aspect, in addition to parameter interface module, for transmitting OFDM sub-channel informations between the first ONU in OLT and the multiple ONU.

With reference to the first possible implementation of first aspect, in second of possible implementation of first aspect, the OFDM sub-channel informations of the parameter interface module transmission include the channel information that the OLT distributes to the first ONU the first OFDM subchannels, described first The PON types that ONU is supported are consistent with the PON types for the first PON MAC modules that the first OFDM subchannels are associated.

With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect, the 0LT is when at least one meets in following condition, and the first OFDM subchannels of distribution give the first ONU:

The OFDM subchannels that first 0NU is supported are matched with the subchannel that the first OFDM subchannels are included；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 P0N types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first 0NU bandwidth demand.

With reference to first aspect the first to any one possible implementation in the third, in the 4th kind of possible implementation of first aspect, the parameter interface module is used for the channel information that multiple OFDM subchannels that the physical layer block based on OFDM is supported are transmitted by the physical layer negotiation process.

With reference to first aspect the first to any one possible implementation in the 4th kind, in the 5th kind of possible implementation of first aspect, the OFDM sub-channel informations include at least one of OFDM gap markers and OFDM subcarrier informations.

With reference to first aspect, and any one possible implementation in the first of first aspect to the 5th kind, in the 6th kind of possible implementation of first aspect, also include management module, incidence relation for setting up 0NU and OFDM subchannels, includes the incidence relation of the first 0NU and the first OFDM subchannels.

With reference to the 6th kind of possible implementation of first aspect, in the 7th kind of possible implementation of first aspect, the incidence relation represents the relation of the channel information of 0NU marks and OFDM subchannels.

With reference in a first aspect, and first aspect the first to any one possible implementation in the 7th kind in the 8th kind of possible implementation of first aspect, the first OFDM subchannels and the 2nd OFDM subchannels be descending subchannel. With reference in a first aspect, and first aspect the first to any one possible implementation in the 8th kind in the 9th kind of possible implementation of first aspect, the multiple Ν media access control MACs modules of Ρ 0 be the 0LT a part of component.

Second aspect, a kind of optical line terminal 0LT, applied to P0N networks, the P0N includes the 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 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 any one possible implementation of first aspect or first aspect；

The physical layer block based on OFDM is used for the data that the first PON MAC modules are transmitted by the first OFDM subchannels；The data of the 2nd P0N MAC modules are transmitted by the 2nd OFDM subchannels.

With reference to second aspect, in the first possible implementation of second aspect, the physical layer block, the data for transmitting 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, including：Physical medium relating module PMD modules, for receiving the data of the first PON MAC modules by the first OFDM subchannels, and are 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 into analog electrical signal；Optical sender：For the analog electrical signal to be converted into optical signal, by the optical signal launch to Optical Distribution Network ODN;

MAC adaptation modules, for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd PON MAC modules are associated with by the 2nd OFDM subchannels.

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 0 N U；The OLT is the OLT as described in second aspect and second aspect any one possible implementation. A kind of fourth aspect, communication means applied to PON, the P0N includes optical line terminal OLT and multiple optical network unit ONUs, and data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, and methods described includes：

The OLT sends the data message based on the first MAC protocol by the first descending subchannels of OFDM to the first ONU, the OLT sends the data message based on the second MAC protocol by the 2nd descending subchannels of OFDM to the 2nd ONU, wherein the OFDM subcarriers that the first OFDM subchannels are included are different with the subcarrier that the 2nd OFDM subchannels are included.

With reference to fourth aspect, in the first possible implementation of fourth aspect, the OLT sends OFDM sub-channel informations to the first ONU.

With reference to fourth aspect, in second of possible implementation of fourth aspect, the OLT is when at least one meets in following condition, 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 are included；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 PON types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first ONU bandwidth demand.

With reference to the first or second of possible implementation of fourth aspect and fourth aspect, the OLT sends the first upgoing O FDM sub-channel informations that the OLT distributes to the first ONU to the first ONU.

With reference to any one possible implementation 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 ONU register method, applied in PON, the PON includes 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, methods described includes：

The OLT sends registration request by the first OFDM subchannels with the first MAC protocol Message；

The OLT sends login request message by the 2nd OFDM subchannels with the second MAC protocol, wherein, the OFDM subcarriers that the first OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included；First MAC protocol is the MAC protocol associated with the first OFDM subchannels, and second MAC protocol is the MAC protocol associated with the 2nd OFDM subchannels, and first MAC protocol is different from the 2nd MAC agreements；

The OLT receives the registration request response message from ONU, judge whether the ONU is legal, be ONU distribution ONU marks if legal, ranging is carried out to the ONU, OFDM subchannels are distributed for the ONU, ONU marks is set up and is associated with the OFDM subchannels.

With reference to the 5th aspect, in the first possible implementation of the 5th aspect, OLT sends the physical layer configuration parameter related to the first OFDM subchannels on the first OFDM subchannels with the first MAC protocol；

OLT sends the physical layer configuration parameter related to the 2nd OFDM subchannels on the 2nd OFDM subchannels with the second MAC protocol, wherein the physical layer configuration parameter includes at least one of OFDM gap markers and OFDM subcarrier informations.

It is the ONU distribution OFDM subchannels in second of possible implementation of the 5th aspect with reference to the 5th aspect, including：

OFDM subchannels are distributed for the ONU, including：

The OLT is when at least one meets in following condition, 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 are included；The spectral range that first ONU is supported is matched with the spectral range of the 3rd OFDM subchannels；The PON types that first ONU is supported are consistent with the PON types for the first PON MAC modules that the 3rd OFDM subchannels are associated；And the 3rd OFDM subchannels bandwidth capacity meet the first ONU bandwidth demand. With reference to second of possible implementation of the 5th aspect, in the third possible implementation of the 5th aspect, methods described also includes：

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

With reference to the third possible implementation of the 5th aspect, in the 4th kind of possible implementation of the 5th aspect, methods described also includes：

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

With reference to the 4th kind of possible implementation of the 5th aspect, in the 5th kind of possible implementation of the 5th aspect, methods described also includes：

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

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

The OLT carries out third time ranging to the ONU.

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

First media access control MAC module, for sending login request message by the first OFDM subchannels with the first MAC protocol；The registration request response message from the first ONU is received, judges whether the first ONU is legal, is the first ONU distribution ONU marks if legal；Ranging is carried out to the first ONU, is the first ONU distribution OFDM subchannels；

Second MAC module, for sending login request message by the 2nd OFDM subchannels with the second MAC protocol；The registration request response message from the 2nd ONU is received, judges whether the 2nd ONU is legal, is the 2nd ONU distribution ONU marks if legal；To institute State the 2nd ONU and carry out ranging, OFDM subchannels are distributed to the 2nd ONU；Wherein, the OFDM subcarriers that the first OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included；First MAC protocol is the MAC protocol associated with the first OFDM subchannels, and second MAC protocol is the MAC protocol associated with the 2nd OFDM subchannels, and first MAC protocol is different from second MAC protocol；Physical medium associates PMD modules, and for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC modules；Down direction, the data of the first PON MAC modules are received by the first OFDM subchannels, and are 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 is coupling in the PMD modules, one end is coupled with first MAC module and/or the second MAC module, for when receiving ONU uplink optical signals, according to bandwidth allocation bitmap BWmap, the ofdm signal that the PMD modules are demodulated is sent to the first MAC module or the second MAC module.

In the first possible implementation of the 6th aspect, first MAC module is additionally operable to send the physical layer configuration parameter related to the first OFDM subchannels with the first MAC protocol by the first OFDM subchannels.

In second of possible implementation of the 6th aspect, first MAC module, for for the first ONU allocation of downlink subchannels, specifically including：

When the spectral range that ONU types are supported and the first OFDM subchannels are mismatched；Or, ONU types are mismatched with the MAC protocol that the first OFDM subchannels are carried；Or, the bandwidth capacity of the first OFDM subchannels fails to meet the first ONU bandwidth demand, and the 3rd OFDM subchannels of distribution give the first ONU, wherein, the 3rd OFDM subchannels meet following condition：

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

In the third possible implementation of the 6th aspect, first MAC module is additionally operable to that after OLT is that the first ONU is assigned with the 3rd OFDM subchannels, second of ranging is carried out to the first 0NU.

In the 4th kind of possible implementation of the 6th aspect, first MAC module is additionally operable to after the bit carrying table of renewal is sent to the ONU by OLT, and third time ranging is carried out to the first ONU.

7th aspect, a kind of optical line terminal OLT, including：Processor, memory, bus and communication interface；The memory is used to store computer executed instructions, the processor is connected with the memory by the bus, when the computer is run, the computer executed instructions of memory storage described in the computing device, so that the computer performs the method as described in any one possible implementation in terms of the 5th and in terms of the 5th.

The present invention proposes a kind of new PON system, equipment and the method for supporting multi-protocols ONU registrations, when PON system faces upgrade requirement, without changing OLT device, can save upgrade cost with smooth upgrade.

Brief description of the drawings is in order to illustrate more clearly of embodiments of the invention or technical scheme of the prior art, and used accompanying drawing makees the introduction of cylinder list when below by description background technology and embodiment.Apparently, described in accompanying drawings below is only a part of embodiment of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings or embodiment can also be obtained according to these accompanying drawings and description, and it is contemplated that covering all these derivative accompanying drawings or embodiment.

Fig. 1 is PON configuration diagram；

Fig. 2 is a kind of apparatus module structure chart applied to passive optical network PON that the embodiment of the present invention one is provided；

Fig. 3 is that the embodiment of the present invention two provides a kind of structural representation of optical line terminal OLT； Fig. 4 is a kind of structural representation for passive optical network PON that the embodiment of the present invention three is provided;Fig. 5 is a kind of ONU structural representations that the embodiment of the present invention three is provided；

Fig. 6 is the structural representation for another ONU that the embodiment of the present invention three is provided；Fig. 7 is a kind of communication means flow chart applied to PON that the embodiment of the present invention four is provided;Fig. 8 is a kind of method flow diagram for ONU registrations that the embodiment of the present invention five is provided；Fig. 9 a are the method flow diagrams for another ONU registrations that the embodiment of the present invention five is provided；Fig. 9 b are a kind of interaction schematic diagrames for ONU registrations that the embodiment of the present invention five is provided；Fig. 9 c are another ONU registration interaction schematic diagrames that the embodiment of the present invention five is provided；Fig. 9 d are another ONU registration interaction schematic diagrames that the embodiment of the present invention five is provided；Figure 10 is a kind of structural representation for optical line terminal OLT that the embodiment of the present invention six is provided；

Figure 11 is a kind of structural representation for optical line terminal OLT that the embodiment of the present invention seven is provided.

Embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples, the present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.

Embodiment one

Orthogonal frequency division multiplexing passive optical network (Orthogonal Frequency Division Multiplexing, OFDM-PON) is a kind of EPON based on OFDM technology.OFDM technology belongs to multi-carrier modulation technology, and its basic thought is the subchannel that channel is divided into some frequency orthogonals, and high-speed data signal is converted into parallel low speed sub-data flow, is modulated on each subchannel and is transmitted.In OFDM-PON systems, uplink and downlink direction Only 1 wavelength.In down direction, OLT MAC (Media Access Control, medium education）Module, for realizing ONU management, DBA (Dynamic Bandwidth Allocation, Dynamic Bandwidth Allocation）, ONU registrations activation, the function such as data transmit-receive；Physical layer includes 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, the hardware device such as photoreceiver, wherein, the data that PMD modules are used to export MAC module are modulated into ofdm signal, DAC is used for the electric signal that the ofdm signal of numeric field is converted to simulation, optical sender Tx is used to convert electrical signals to optical signal, is transmitted into Optical Distribution Network ODN.Optical signal is through ODN network transmissions to ONU, ONU photoreceiver Rx is used to receive optical signal, and convert optical signals to electric signal, analog-digital converter ADC is used to analog electrical signal being converted to data signal, the demodulation of ofdm signal is realized by PMD modules, the signal after demodulation is transmitted to MAC module and handled.In up direction, ONU MAC module is used to realizing the functions such as ONU management, DBA, data transfer, and the function of the module such as PMD, DAC, Tx, Rx, ADC is similar with introducing for down direction, 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, the PON includes 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, described device includes：

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 2nd OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included.

Alternatively, the MAC protocol includes GPON agreements, EPON agreements, 10G-GPON agreements, 10G-EPON agreements, or the MAC protocol of the higher transfer rate such as 40G-PON, 100G-PON, or Ethernet protocol, 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 protocol.

Alternatively, the first PON MAC modules and the 2nd PON MAC modules can be integrated.

Alternatively, the first OFDM subchannels and the 2nd OFDM subchannels are divided down going channel by subcarrier grouping.Such as, descending ofdm signal has 1024 subcarriers, and H is not divided into 4 subchannels, and each subchannel takes 256 subcarriers, and the ID of subchannel is respectively 0 ~ 3.

Alternatively, the first OFDM subchannels and the 2nd OFDM subchannels are to divide down going channel by the frequency spectrum of descending ofdm signal.Such as, the frequency spectrum of descending ofdm signal is 1GHz, it is assumed that be divided into 4 subchannels, and each subchannel takes 250MHz frequency spectrum resource, and the ID of subchannel is respectively 0 ~ 3.

Alternatively, described device also includes parameter interface module, for transmitting OFDM sub-channel informations between the first ONU in OLT and the multiple ONU.Wherein, the OFDM sub-channel informations include the channel information that the OLT distributes to the first ONU the first OFDM subchannels, and the PON types that the first ONU is supported are consistent with the PON types for the first PON MAC modules that the first OFDM subchannels are associated.For example, such as the first PON MAC modules support GPON agreements, the first OFDM subchannels to support GPON agreements, first ONU corresponding with the first OFDM subchannels to support GPON agreements；2nd PON MAC modules support EPON agreements, the 2nd OFDM subchannels to support EPON agreements, twoth ONU corresponding with the subchannel to support EPON agreements. Described device also includes：During any one condition below satisfaction, the first OFDM subchannels of distribution give the first 0NU, and the condition includes：

The spectral range that first 0NU 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 PON types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first 0NU bandwidth demand.

Optionally, the parameter interface module is used for the channel information that multiple OFDM subchannels that the physical layer block based on OFDM is supported are transmitted by the physical layer negotiation process.

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

Alternatively, described device also includes management module, and the incidence relation for setting up ONU and OFDM subchannels includes the incidence relation of the first ONU and the first OFDM subchannels.The incidence relation illustrates the relation of the channel information of ONU marks and OFDM subchannels.

Alternatively, the first OFDM subchannels and the 2nd OFDM subchannels are descending subchannel.

Alternatively, the first OFDM subchannels and the 2nd OFDM subchannels are respectively upgoing O FDM subchannels and descending OFDM subchannels, or respectively descending OFDM subchannels and upgoing O FDM subchannels.

Alternatively, 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, can use field programmable gate array（Field-Programmable Gate Array, FPGA), special integrated chip (Application Specific Integrated Circuit, ASIC) can be used, System on Chip/SoC can also be used（System on Chip, SoC), central processing unit can also be used（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（Micro Controller Unit, MCU), can also use can Programmable controller（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, applied to passive optical network PON, the PON includes the 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 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, and the physical layer block based on OFDM is used for the data that the first PON MAC modules are transmitted by the first OFDM subchannels；The data of the 2nd PON MAC modules are transmitted by the 2nd OFDM subchannels.

Specifically, physical layer block includes：

Physical medium associates PMD modules, for down direction, the data of the first PON MAC modules is received by the first OFDM subchannels, and be 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；Up direction, receives the digital base band OFDM signal that analog-digital converter is sent, and demodulate the manageable data-signals of MAC.

What deserves to be explained is, in OFDM-PON, the up use time division multiple acesses of ONU（Time Division Multiplexing Access, TDMA) mode transmit data.OLT can distribute a small amount of bandwidth and report its bandwidth demand for ONU, and such as its data Slow to be sent rushes the length or size in area, and OLT receives rear accounting point counting dispensing ONU bandwidth authorizing size, and with bandwidth allocation bitmap（Bandwidth Map, BWmap) or other forms issue ONU, authorization by direction to the ONU ascending time slot at the beginning of between and length information, after ONU receives BWmap, it is luminous in corresponding ascending time slot according to BWmap timing, upstream data is sent to OLT.

Wherein, the PON MAC modules, support the ONU of same MAC protocol to distribute BWmap for giving PON MAC respectively.Such as support the MAC module of GPON agreements to branch The ONU distribution BWmap of GPON agreements are held, support the MAC module of EPON agreements to the ONU distribution BWmap for supporting EPON agreements.

Digital analog converter, for the ofdm signal to be converted into analog electrical signal；Optical sender, for the analog electrical signal to be converted into optical signal, by the optical signal launch to Optical Distribution Network ODN.

MAC adaptation modules, one end is coupling in each described PON MAC module, and one end is coupling in the PMD modules, and for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC modules；When receiving uplink optical signal, according to BWmap, determine that the moment sends the PON MAC modules corresponding to the ONU of signal, the data-signal that PMD modules are demodulated is sent to the corresponding PON MAC modules.

The physical layer block also includes analog-digital converter and photoreceiver, wherein, photoreceiver is used to receive the uplink optical signal sent from ONU, and converts optical signals to analog electrical signal；Analog-digital converter is used to the analog electrical signal being converted to data signal, sends to PMD modules.

Embodiment three

The embodiment of the invention discloses a kind of passive optical network PON, as shown in Figure 4, including OLT and multiple ONU, data are carried based on orthogonal frequency division multiplex OFDM between the OLT and the ONU, the OLT can support a variety of MAC protocols, such as GPON, EPON, 10G-GPON or 10G-EPON, and the one or more in 40G-PON, 100G-PON agreement of the higher rate of future development, or the MAC protocol such as Ethernet protocol, CPRI agreements, OBSAI.Correspondingly, the multiple ONU is supported in a kind of agreement in the agreements such as GPON, EPON, 10G-GPON or 10G-EPON, Ethernet protocol, CPRI agreements, OBSAI, the PON system, at least in the presence of two kinds of MAC protocols.

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

Preferably, the close ONU of to-noise ratio SNR can be assigned to same subchannel, the requirement modulation downstream signal that the subchannel where ONU higher SNR can be higher, so as to improve The total bandwidth of down going channel.

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

The OLT, including the OLT as described in implementing two;

The multiple ONU, for receiving downlink optical signal from the ODN, and is transferred to OLT by upstream data in the way of time division multiple acess TDMA.

The ONU, is specifically included：

Photoreceiver, for receiving the optical signal of ODN transmission, and is converted to analog electrical signal；Analog-digital converter DAC, for analog electrical signal to be converted into digital baseband signal；PMD modules, for digital baseband signal to be demodulated, form the manageable data-signal of MAC module；

MAC module, for receiving the data of PMD modules, and is handled.

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

Specifically, ONU hardware configuration has two kinds of embodiment schemes, as shown in Figure 5, the first, using the scheme directly detected, the ofdm signal of ONU fixed reception downstream spectrums, it can be used for EPON, GPON, 10G-GPON, 10G-EPON implementation.

Second, using the scheme of electrical domain coherent reception, as shown in fig. 6, regulation local oscillator（Local Oscillator, LO) the general centre frequency of frequency alignment downlink frequency, the ofdm signal of the centre frequency subchannel consistent with the centre frequency can be received, can be used for EPON, GPON ONU implementations.

It should be noted that OLT needs to transmit the information of the corresponding subchannels of the first ONU in advance, the mark ID or the frequency range of subchannel of such as subchannel, in order to which LO frequency can be adjusted to the subchannel by the first ONU, receive signal.Described informing in advance can be sent the incidence relation information of ONU and subchannel to ONU by message, can also associate this Relation information is configured to ONU locally, can also here be repeated no more using other modes in the prior art.

Direct detection scheme and electrical domain coherent reception scheme are prior art, and here is omitted.It is clear to describe, such as the ONU for supporting GPON is referred to as the first ONU, the ONU for supporting EPON is referred to as the 2nd ONU, support 10G-GPON ONU to be referred to as the 3rd ONU.

Ofdm signal is received using the first the first ONU directly detected, corresponding MAC data-signal is demodulated and extract.According to embodiment one, the first PON MAC modules are associated with the first OFDM subchannels, and the first MAC protocol is GPON agreements, then the 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, regulation LO frequency is alignd with the centre frequency of downstream spectrum, the ofdm signal for the subchannel that can be alignd with fixed reception with the centre frequency, and demodulates data-signal.

Using the 3rd ONU of the first scheme, in order to realize bigger bandwidth, it is necessary to support to receive and handle the ofdm signal of whole or multiple subchannels, i.e., multiple subchannels are bound into a down going channel.

Example IV

The embodiment of the present invention discloses a kind of communication means applied to PON, this method is applied to the PON system as described in embodiment three, as shown in Figure 7, the PON includes 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, methods described includes：

Alternatively, methods described also includes：

The OLT sends the OLT to the first ONU and distributes to the first of the first ONU Descending OFDM sub-channel informations.

Alternatively, methods described also includes：

The OLT is when in following condition, at least one meets, and the first OFDM subchannels of distribution give "-ONU: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 PON types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first 0NU bandwidth demand.

Alternatively, methods described also includes：

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

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

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

ONU receiving terminals, are to be received according to the subcarrier of different frequency according to time order and function order, by Fourier transformation method, time-domain signal are converted into frequency-region signal, and each ONU receives corresponding data from corresponding OFDM subchannels.When up, according to blunt to OLT in time division multiple acess TDMA modes.

Up only one of which wavelength, the ONU of different MAC protocols accesses OLT in TDMA modes, and OLT PMD modules demodulation upgoing O FDM signals have two methods：One is to switch demodulation parameter according to BWmap (Bandwidth Map, bandwidth allocation bitmap) information（Such as up B tables, equalizing coefficient table）, corresponding ONU upstream data is demodulated, PON MAC modules corresponding with the ONU are then forwarded to（Forwarding capability can also be realized by the MAC adaptation modules of MAC layer）；Two be the up use identical demodulation parameters of all ONU, demodulates upstream data, and according to BWmap information PON MAC modules corresponding with the ONU are forwarded in the MAC adaptation modules of MAC layer.

Specifically, BWmap includes the description information of ONU ascending time slots, BWmap by OLT issues ONU, and OLT can also adjust pmd layer parameter in advance according to BWmap and carry out the preparation for receiving upstream data；In addition, corresponding ONU-ID can be got by Alloc-ID, uplink data frames include ONU-ID, it can compare ONU-ID fields after MAC receives upstream data, whether both are consistent for detection, can also compare the reception time of ONU upstream datas and whether the mandate time whether consistent timing to judge ONU in BWmap is normal.This scheme is prior art, is repeated no more here.

Embodiment five

Fig. 8 shows a kind of method flow diagram of ONU registrations provided in an embodiment of the present invention, and applied in PON, the PON includes 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, as shown in figure 8, methods described 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, the OFDM subcarriers that the first OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included；

S804, the OLT receives the registration request response message from ONU, to be judged as that legal ONU distribution ONU is identified and 0 FDM subchannels, the ONU marks of foundation distribution and associating for OFDM subchannels.OLT according to ONU sequence number judge the ONU whether be legal 0 and.

Alternatively, methods described also includes：OLT sends the physical layer configuration parameter related to the first OFDM subchannels on the first OFDM subchannels with the first MAC protocol；

Specifically, it is the ONU distribution OFDM subchannels, including：

When the spectral range that ONU types are supported and the first OFDM subchannels are mismatched；Or Person, ONU types are mismatched with the MAC protocol that the first OFDM subchannels are carried；Or, when the bandwidth capacity of the first OFDM subchannels fails to meet the first ONU bandwidth demand, the 3rd OFDM subchannels of distribution give the first ONU, wherein, the 3rd OFDM subchannels meet one of following condition：

The spectral range that first 0NU is supported is matched with the spectral range of the 3rd OFDM subchannels；The PON types that first ONU is supported are consistent with the PON types for the first PON MAC modules that the 3rd OFDM subchannels are associated；And the 3rd OFDM subchannels bandwidth capacity meet the first ONU bandwidth demand.

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

It is that the ONU distributes the descending subchannels of the 3rd OFDM that methods described, which also includes the OLT, and when the 3rd OFDM subchannels are different from the first OFDM subchannels, the OLT carries out second of ranging to the ONU.

Wherein, the descending subchannel that ONU receives registration message is ONU oneself selections, is not OLT distribution.If the subchannel of ONU oneself selections meets the principle of OLT allocation of downlink subchannels, OLT formally distributes the subchannel to the ONU, otherwise distributes other descending subchannels to the ONU.

Further, the formal descending subchannel principle of OLT distribution has：Whether the PON protocol types of subchannel are consistent, whether the bandwidth capacity of subchannel meets ONU requirements, whether carrier ID is consistent（There is kind of a scene, descending subchannel and operator binding, the only ONU of the operator could be accessed）, between descending subchannel between the consideration of load balancing, subchannel flow scheduling consideration（Such as in order to save, ONU is concentrated on into the descending subchannel in part when ONU is less) etc..

Methods described is also included after OLT is that the ONU distributes the 3rd OFDM subchannels, and the downstream bits carrying table of renewal is reported the OLT by the ONU. It should be noted that OLT and ONU determines that the pmd layer running parameter of subchannel is realized by the bit carrying table B tables of acquiescence or the bit carrying table B tables of renewal.

The technology for giving tacit consent to B tables is prior art, refer to the related record of prior art, repeats no more here.

The ONU reports the downstream bits carrying table of renewal before the OLT, in addition to:

ONU;The ONU receives the descending training sequence by the descending subchannels of the 3rd OFDM, and calculates the downstream bits carrying table for generating the renewal；The downstream bits carrying table of the renewal is sent to the OLT by the ONU.

Methods described is also included after OLT is that the ONU distributes the 3rd OFDM subchannels, and the upstream bits carrying table of renewal is sent to the ONU by the OLT.

The upstream bits carrying table of renewal is sent to before the ONU by the OLT, in addition to:The ONU sends up training sequence to the OLT;The OLT receives the up training sequence by the OFDM data feedback channels, and calculates the upstream bits carrying table for generating the renewal；The upstream bits carrying table of the renewal is sent to the ONU by the OLT by the descending OFDM subchannels.

Methods described also includes the OLT and 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 a kind of ONU register methods flow charts provided in an embodiment of the present invention, Fig. 9 b, 9c, 9d are a kind of ONU register flow paths interaction figures provided in an embodiment of the present invention, as shown in Fig. 9 a, 9b, 9c, 9d.

In the PON, the optical network unit ONU that optical line terminal OLT passes through the multiple different EPON MAC protocols of Optical Distribution Network ODN connections, mapping relation information of the optical line terminal OLT provided with M descending subchannels with N kind MAC protocols, wherein, M, N are the integer more than or equal to 1.It is described to be provided with, it can be that the mapping relation information is stored in OLT memory RAM or ROM, flash memory, register etc., can also be and directly write the mapping relation information in chip, can also be by configuration order row or network management system, It is arranged on by the way of outside input on the OLT.

S900, OLT obtain each descending subchannel and the corresponding relation of MAC protocol, wherein, the first subchannel is corresponding with the first MAC protocol.

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

The mapping table of descending subchannel and MAC protocol

As shown in table 1, subchannels and GPON agreement of the ID for 0 --- it is corresponding, subchannels and EPON agreement of the ID for 1 --- corresponding, subchannels and 10G-GPON agreement of the ID for 2 --- corresponding, subchannels and 10G-EPON agreement of the ID for 3 --- it is corresponding.

Further, the M descending subchannels can be the frequency spectrum according to descending ofdm signal, multiple subchannels that down going channel is divided into.In the present embodiment, so that the frequency spectrum of ofdm signal is 1 GHz as an example, H is not classified as 4 subchannels（It is of course also possible to be divided into other multiple subchannels）, each subchannel takes 250MHz frequency spectrum resource, and the ID of 4 subchannels is respectively set to 0 ~ 3.

Further, it is assumed that 1 GHz frequency spectrum can support 1 OGbps message transmission rate.For GPON, usual downlink transmission data rate is 2.5Gbps, and higher uplink bit rate is 1.25Gbps.For EPON, usual uplink and downlink message transmission rate is 1.25Gbps, so G/E-PON (being referred to as GPON and EPON) only need to take less frequency spectrum resource, it is assumed that the frequency spectrum for being G/E-PON distribution is 250MHz.For 10G-GPON, usual downlink transmission data rate is lOGbps, and higher uplink bit rate is 2.5Gbps.Asymmetrical 10G-EPON, downlink transmission data rate is lOGbps, and higher uplink bit rate is 1.25Gbps, therefore the descending of 10G-PON (being referred to as descending lOGbps PON, including 10G-GPON and 10G-EPON) needs 1GHz frequency spectrum.

Further, down going channel can be divided into multiple subchannels by the M descending subchannels according to the frequency spectrum of descending ofdm signal.In the present embodiment, so that the frequency spectrum of ofdm signal is 1GHz as an example, 4 Jia, which are set, is classified as 4 subchannels（It is of course also possible to be divided into other multiple subchannels）, the ID of 4 subchannels is respectively set to 0 ~ 3.

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

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

It is apparent that using preferred scheme, G/E-PON ONU costs can accomplish that the cost of the ONU than 10G-PON is lower, therefore, different PON ONU 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；

It is that the first MAC protocol is illustrated by 0 corresponding GPON agreements of the subchannel ID in table 1 for ease of understanding.OLT, according to the mapping relation information, the first ONU login request messages is issued to the-ONU by ID by reading the mapping relation information in table 1 for 0 subchannel;Wherein, the first ONU is the ONU for supporting GPON agreements.

Specifically, the frame format of the first ONU login request messages, can be using in GPON systems in the prior art, and OLT issues the frame format of ONU login request messages, can also use Other customized frame formats.On GPON systems in the prior art, ONU login request messages frame format is prior art, is repeated no more here.

Further, OLT starts ONU registration processes in periodicity, before the first MAC protocol transmission login request message, can also be by the first subchannel of the M subchannel, physical layer parameter needed for the first ONU normal works are issued by giving tacit consent to downstream bits carrying table 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；

It is that the second MAC protocol is illustrated by 1 corresponding EPON agreements of the subchannel ID in table 1 for ease of understanding.OLT, according to the mapping relation information, the 2nd ONU login request messages to the 2nd ONU is issued by ID by reading the mapping relation information in table 1 for 1 subchannel;Wherein, the 2nd ONU is the ONU for supporting EPON agreements.

Specifically, the frame format of the 2nd ONU login request messages, can be using in EPON system in the prior art, and OLT issues the frame format of ONU login request messages, can also use other customized frame formats.On EPON system in the prior art, ONU login request messages frame format is prior art, is repeated no more here.

Further, OLT starts ONU registration processes in periodicity, by before giving tacit consent to downstream bits carrying table with the second MAC protocol transmission login request message, can also be by the second subchannel of the M subchannel, physical layer parameter needed for issuing the 2nd ONU normal works describes message, and quiet window is opened in data feedback channel.

As shown in 9b, wherein, on first ONU (being GPON ONU in figure) after electricity, table scan its each descending subchannel that can support is carried by giving tacit consent to downstream bits, if can reach on descending subchannel of one of which synchronous and correctly parse downlink frame, the MAC protocol that descending subchannel shown in then illustrating is supported is consistent with the MAC protocol that the ONU is supported, the ONU can regard the descending subchannel as interim descending subchannel and renewal of registration flow, the interim descending subchannel is only used for registration, business datum can not be transmitted.As shown in figure 9b, GPON ONU selections receive downlink frame and synchronous on subchannel 0. Alternatively, physical layer parameter needed for OLT issues the first ONU normal works in step 900 describes message to the first ONU, first ONU receives the physical layer parameter and described after message, message is described according to the parameter to be configured, then the first ONU login request messages are received, and the first ONU login request messages are responded, report sequence number SN.

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

Alternatively, the first ONU can also report ONU types to OLT, described to report ONU types together to be reported by reporting sequence number SN message；Can individually it 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 specification, and the OLT can know the information such as the frequency, uplink and downlink speed, MAC protocol, the bandwidth of support of ONU supports according to the ONU types.

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

Step 903:The OLT receives the registration request response message from ONU, judges whether the ONU is legal, is ONU distribution ONU marks if legal（It is referred to as ONU-ID), ranging is carried out to the ONU, is the formal descending subchannel of ONU distribution, associating for ONU marks and the descending subchannel is set up.The formal descending subchannel can be not only used for registration, can also transmit business datum.

Alternatively, OLT records subchannel ID, ONU-ID with supporting the mapping relation information of MAC protocol, and the table 1 after renewal is（It is empty, the state after all distribution ONU-ID is shown in table 1 now in the row of ONU marks one if EPON, 10G-EPON, 10G-GPON ONU do not distribute ONU-ID also）：

The mapping table of descending subchannel and MAC protocol

Subchannel ID MAC protocols ONU is identified

0 GPON ONU-ID=l 1 EPON ONU-ID=2

2 10G-GPON ONU-ID=3

3 10G-EPON ONU-ID=4

OLT manages message by physical layer operations（Physical Layer Operation And Management, PLO AM) or other customized broadcast messages, physical layer parameter needed for issuing the 2nd ONU normal works describes message to the 2nd ONU, on 2nd ONU after electricity, receive the physical layer parameter to describe after message, describing message according to the parameter carries out initial configuration, then receives the 2nd ONU login request messages, and the 2nd ONU login request messages are responded, report sequence number SN.

Alternatively, the 2nd ONU can also report ONU types to OLT, described to report ONU types together to be reported by reporting sequence number SN message；Can individually it 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 specification, and the OLT can know the information such as the frequency, uplink and downlink speed, MAC protocol, the bandwidth of support of ONU supports according to the ONU types.

Alternatively, if the 2nd ONU does not report ONU types to OLT, OLT can obtain the information such as the frequency that the 2nd ONU be supported, up, downlink transmission rate, MAC protocol, the bandwidth supported according to the sequence number SN.

Specifically, OLT is received after the response message of the first ONU login request messages from the first ONU, verify whether the sequence number SN that the first ONU is reported is legal, if legal, then OLT is that the first ONU distributes the first ONU-ID, and the first ONU-ID is handed down into the first ONU;If illegal, the first ONU is kicked offline by OLT.

With reference to table 1, for example, OLT receives the SN reported come the ONU of self-supporting GPON agreements by ID for 0 subchannel, after verifying that the SN is legal, by the ONU-ID that ONU-ID is 1 The ONU of support GPON agreements is distributed to, conversely, verifying that the SN is illegal, then the ONU is kicked offline.

Wherein, whether be legal ONU, can according in the prior art, by report it is that SN prestores with OLT or pre-configured or inputted by order line or the SN that is inputted by network management system matched, if matching is consistent, the ONU is legal ONU;Conversely, for illegal 0.

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

OLT is the formal descending subchannel of ONU distribution, and descending subchannel ID sent to 0 and.

Wherein, if the interim subchannel that ONU is currently selected meets one of following condition, OLT is that ONU distributes another descending subchannel as formal subchannel；Otherwise, OLT is using the interim subchannel as formally descending subchannel assignment is to ONU, and the condition is：

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

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

OLT will meet first OFDM subchannel assignment of ONU demands to ONU；Or, OLT by meet in multiple OFDM subchannels of ONU demands any one distribute to ONU;Or, OLT will meet an optimal OFDM subchannel assignments for ONU demands to ONU;Or OLT binds multiple descending OFDM subchannel assignments to ONU.

As shown in figure 9b, current interim subchannel meets GPON ONU demand, OLT by subchannel ID for 0 subchannel assignment to ONU.As is shown in fig. 9 c, current interim subchannel is unsatisfactory for GPON ONU demand, OLT by subchannel ID for 3 subchannel assignment to ONU.As shown in figure 9d, XG-PON ONU is larger to the bandwidth demand of subchannel, and ONU is synchronous on subchannel 1 and 2, when this two interim subchannels meet XG-PON ONU demands When, after OLT binds subchannel ID for 1 and 2 subchannel, XG-PON ONU are given as formal descending subchannel assignment.

Step 904:When the descending subchannels of ONU change, OLT initiates second of ranging.Specifically, OLT is that ONU has redistributed descending subchannel in step 904, the formal descending subchannel of the distribution may be different from subchannel ID interim before, therefore, when the descending subchannels of ONU change, OLT needs second of ranging, or by calculating the distance measurement result for obtaining the ONU on new descending subchannel, by identical ONU the distribution descending subchannel and current subchannel distance measurement result difference come the distance measurement result of ONU as described in calculating;Conversely, OLT does not need second of ranging.

Step 905:After the descending subchannels of ONU change, OLT and ONU are it needs to be determined that the pmd layer running parameter of subchannel.

Usually, in OFDM-PON, OLT and ONU carry table B tables in registration process using the bit of acquiescence（Alternatively referred to as bit map）Communicated, and then determine PMD layers of running parameter.Ofdm signal has multiple subcarriers in frequency domain, and each subcarrier is according to signal to noise ratio（Signal Noise Ratio, SNR) characteristic, each clock can carry different bit numbers, i.e. B values, and the B tables are the mapping tables of passage sub-carriers ID and B value.

Alternatively, the method that OLT and ONU determine descending B tables：OLT sends descending training sequence and the signal to noise ratio of each subcarrier is calculated according to the descending training sequence of reception to ONU, ONU（Signal Noise Ratio, SNR), further according to the SNR, calculate the descending B tables of the ONU.The descending B tables calculated are reported to OLT by ONU, and OLT is configured according to the descending B tables.

Alternatively, the method that OLT and ONU determine up B tables：ONU sends up training sequence and the signal to noise ratio (Signal Noise Ratio, SNR) of each subcarrier is calculated according to the up training sequence of reception, further according to the SNR, the up B tables of the OLT are calculated to OLT, OLT.The up B tables calculated are sent to ONU, ONU and configured according to the up B values by OLT.

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

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

The third time ranging is identical with first time, second of ranging process, repeats no more here.OLT and ONU enter normal communication state.

Embodiment six

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

Memory 100, the corresponding relation for preserving each descending subchannel and MAC protocol, wherein, the first subchannel 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；The registration request response message from the first ONU is received, judges whether the first ONU is legal, is the first ONU distribution ONU marks if legal；Associating for ONU mark and OFDM subchannels is set up, to the first ONU progress rangings；Formal descending subchannel is distributed for the first ONU；

Alternatively, the first MAC module 101, is additionally operable to send the physical layer configuration parameter related to the first OFDM subchannels with the first MAC protocol by the first OFDM subchannels.

Alternatively, first MAC module 101, for distributing formal descending subchannel for the first ONU, is specifically included：

The spectral range and current interim subchannel supported when ONU types（Current interim subchannel is the first OFDM subchannels）Mismatch；Or, ONU types and the MAC protocol of current interim subchannel carrying are mismatched；Or, when the bandwidth capacity of current interim subchannel fails the bandwidth demand for meeting ONU, the 3rd OFDM subchannels of distribution give the first ONU;Now, the 3rd OFDM subchannels meet following condition：

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

Alternatively, first MAC module 101, is additionally operable to when OLT is that the formal descending subchannel that the first ONU is distributed is different from current interim subchannel, is that the first ONU is redistributed after OFDM subchannels to the first ONU second of ranging of progress.

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

Alternatively, first MAC module 101, is additionally operable to update after bit carrying table and carries out third time ranging to the first ONU.

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

Alternatively, the second MAC module 102, is additionally operable to send the physical layer configuration parameter related to the 2nd OFDM subchannels with the second MAC protocol by the 2nd OFDM subchannels.

Second MAC module 102, for for the 2nd ONU allocation of downlink subchannels, specifically including：

When at least one meets OLT in following condition, the 2nd OFDM subchannels of distribution give the 2nd ONU:

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

Alternatively, second MAC module 102, is additionally operable to when OLT is that the formal descending subchannel that the 2nd ONU is distributed is different from interim subchannel, is that the 2nd ONU is redistributed after OFDM subchannels to the 2nd ONU second of ranging of progress.

Alternatively, second MAC module 102, is additionally operable to after OLT is that the 2nd ONU is assigned with formal OFDM subchannels, the upstream bits carrying table of renewal is sent to the ONU by the OLT.

Alternatively, second MAC module 102, is additionally operable to update after bit carrying table and carries out third time ranging to the 2nd ONU.

MAC adaptation modules 103,-end is coupling in PMD modules, one end is coupled with the first MAC module 101 and the second MAC module 102, and for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC modules；ONU uplink optical signal is received, according to BWmap, the data-signal that PMD modules are demodulated is sent to the first MAC module 101 or the second MAC module 102.

PMD modules 104, for down direction, the data of the first PON MAC modules are received by the first OFDM subchannels, and be 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；Up direction, receives the digital base band OFDM signal that analog-digital converter is sent, and demodulate the manageable data-signals of MAC；

Wherein, the OFDM subcarriers that the first OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included；First MAC protocol is the MAC protocol associated with the first OFDM subchannels, and second MAC protocol is the MAC protocol associated with the 2nd OFDM subchannels, and first MAC protocol is different from second MAC protocol；Specific interaction, reference can be made to the description of embodiment five, is repeated no more here.

The MAC module 102 of first MAC module 101 or second, can using field-programmable gate array it is bad ' J (Field-Programmable Gate Array, FPGA), special collection can be used Into chip（Application Specific Integrated Circuit, ASIC), System on Chip/SoC can also be used（System on Chip, SoC), central processing unit can also be used（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（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.Connected between CPU1101, memory 1102 and communication interface 1104 by communication bus 1103 and complete mutual communication.

Processor 1101 may be monokaryon or multinuclear CPU, be either specific integrated circuit or one or more integrated circuits to be configured to implement 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 disk deposit 4 all devices.

Memory 1102 is used for computer executed instructions 1105.Specifically, program code can be included in computer executed instructions 1105.

When computer is run, the operation computer executed instructions 1105 of processor 1101 can perform the method flow as described in embodiment five.

By above technical scheme, when PON system faces upgrade requirement, without changing OLT equipment, upgrade cost can be saved with smooth upgrade；Meanwhile, support increases bandwidth on demand, and ODN utilization rate is high, saves resource.

Only illustrated in the embodiment of the present invention by taking G/E-PON and 10G-PON as an example, but not limited to this, with the evolution of network, it is possible that single pass 40G-PON, 100G-PON in network, also technical scheme can be used, realize that various protocols, the ONU of a variety of speed coexist, will not be repeated here.

It will be recognized by those of ordinary skill in the art that various aspects of the invention or various aspects Possibility implementation can be embodied as system, method or computer program product.Therefore, the possibility implementation of each aspect of the present invention or various aspects can use complete hardware embodiment, complete software embodiment（Including firmware, resident software etc.）, or the embodiment of integration software and hardware aspect form, collectively referred to herein as " circuit ", " module " or " system ".In addition, the possibility implementation of each aspect of the present invention or various aspects can use the form of computer program product, computer program product refers to be stored in the computer readable program code in computer-readable medium.

Computer-readable medium can be computer-readable signal media or computer-readable recording medium.Computer-readable recording medium is including but not limited to electronics, magnetic, optics, electromagnetism, infrared or semiconductor system, equipment either device or foregoing any appropriately combined, such as random access memory（RAM), read-only storage（ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory）, optical fiber, portable read-only storage (CD-ROM).

Processor in computer reads the computer readable program code being stored in computer-readable medium so that processor is able to carry out function action specified in the combination of each step or each step in flow charts；The device in function action specified in each piece of block diagram or each piece of combination is implemented in generation.

Computer readable program code can perform completely on the computer of user, partly perform on the computer of user, as single software kit, partly on the computer of user and part is performed on remote computer or server on the remote computer, or completely.It is also noted that in some alternate embodiments, each piece of function of indicating may not be occurred by the order indicated in figure in each step or block diagram in flow charts.For example, dependent on involved function, two steps or two blocks shown in succession may be actually executed substantially concurrently, or these blocks may sometimes be performed with reverse order.

Those of ordinary skill in the art are it is to be appreciated that the unit and algorithm steps of each example described with reference to the embodiments described herein, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can be to every Described function is realized in individual specific application using distinct methods, but this realization is it is not considered that beyond the scope of this invention.

It is described above; only embodiment of the invention, but protection scope of the present invention is not limited thereto, any one skilled in the art the invention discloses technical scope in; change or replacement can be readily occurred in, should be all included within the scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.

Several embodiments of the present invention are the foregoing is only, those skilled in the art is according to application god and scope.

Claims

Claims

1st, a kind of device applied to passive optical network PON, the PON includes optical line terminal OLT and multiple optical network unit ONUs, characterized in that, carrying data based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, described device includes：

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 PON MAC modules, the PON types that the first PON MAC modules and the 2nd PON MAC modules are supported are different, and the PON types include MAC protocol and at least one of PON link rates；

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 2nd OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included.

2nd, device as claimed in claim 1, it is characterised in that also including parameter interface module, for transmitting OFDM sub-channel informations between the first ONU in OLT and the multiple ONU.

3rd, device as claimed in claim 2, it is characterized in that, the OFDM sub-channel informations of the parameter interface module transmission include the channel information that the OLT distributes to the first ONU the first OFDM subchannels, and the PON types that the first ONU is supported are consistent with the PON types for the first PON MAC modules that the first OFDM subchannels are associated.

4th, device as claimed in claim 3, it is characterised in that the OLT is when at least one meets in following condition, 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 are included；Spectral range and the frequency spectrum model of the first OFDM subchannels that first ONU is supported Enclose matching；The PON types that first ONU is supported are consistent with the P0N types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first 0NU bandwidth demand.

5th, the device as described in claim 2-4 any one, it is characterised in that the parameter interface module is used for the channel information that multiple OFDM subchannels that the physical layer block based on OFDM is supported are transmitted by the physical layer negotiation process.

6th, the device as described in claim 2-5 any one, it is characterised in that the OFDM sub-channel informations include at least one of OFDM gap markers and OFDM subcarrier informations.

7th, the device as described in any one of claim 1 to 6, it is characterised in that also including management module, the incidence relation for setting up ONU and OFDM subchannels, includes the incidence relation of the first ONU and the first OFDM subchannels.

8th, device as claimed in claim 7, it is characterised in that the incidence relation represents the relation of the channel information of ONU marks and OFDM subchannels.

9th, the device as described in any one of claim 1 to 8, it is characterised in that the first OFDM subchannels and the 2nd OFDM subchannels are descending subchannel.

10th, the device as described in any one of claim 1 to 9, it is characterised in that the multiple PON media access control MACs module is a part of component of the OLT.

11st, a kind of optical line terminal OLT, applied to PON, the PON includes the OLT and multiple optical network unit ONUs;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 for the data that the first PON MAC modules are transmitted by the first OFDM subchannels；2nd PON is transmitted by the 2nd OFDM subchannels

The data of MAC module.

12nd, OLT as claimed in claim 11, it is characterised in that the physical layer block, the data for transmitting the first PON MAC modules by the first OFDM subchannels, by the Two OFDM subchannels transmit the data of the 2nd PON MAC modules, including：Physical medium relating module PMD modules, for receiving the data of the first PON MAC modules by the first OFDM subchannels, and are 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 into analog electrical signal；Optical sender：For the analog electrical signal to be converted into optical signal, by the optical signal launch to Optical Distribution Network ODN;

MAC adaptation modules, for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd PON MAC modules are associated with by the 2nd OFDM subchannels.

13rd, a kind of passive optical network PON system, including optical line terminal OLT and multiple optical network unit ONUs;Characterized in that, carrying data based on orthogonal frequency division multiplex OFDM between the OLT and the multiple O N U；The OLT is the OLT as described in claim 11-12.

14th, a kind of communication means applied to PON, the PON includes optical line terminal OLT and multiple optical network unit ONUs, characterized in that, carrying data based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, methods described includes：

The OLT sends the data message based on the first MAC protocol by the first descending subchannels of OFDM to the first ONU of the first PON types of support, the OLT sends the data message based on the second MAC protocol by the 2nd descending subchannels of OFDM to the 2nd ONU of the 2nd PON types of support, wherein the OFDM subcarriers that the first OFDM subchannels are included are different with the subcarrier that the 2nd OFDM subchannels are included.

15th, method as claimed in claim 14, in addition to：

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

16th, method as claimed in claim 15, it is characterised in that the OLT is when at least one meets in following condition, and the first OFDM subchannels of distribution give the first ONU:

The son that the OFDM subchannels and the first OFDM subchannels that first ONU is supported are included Passage is matched；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 PON types for the first PON MAC modules that the first OFDM subchannels are associated；And the first OFDM subchannels bandwidth capacity meet the first 0NU bandwidth demand.

17th, the method as described in claim 14-16 any one, in addition to：The OLT sends the first upgoing O FDM sub-channel informations that the OLT distributes to the first ONU to the first ONU.

18th, the method as described in claim 15-17 any one, it is characterised in that the OFDM sub-channel informations include at least one of OFDM gap markers and OFDM subcarrier informations.

19th, a kind of ONU register method, applied in P0N networks, the P0N includes optical line terminal OLT and multiple optical network unit ONUs;Characterized in that, carrying data based on orthogonal frequency division multiplex OFDM between the OLT and the multiple ONU, methods described includes:The OLT sends login request message by the first descending OFDM subchannels with the first MAC protocol；

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

The OLT receives the registration request response message from ONU, to be judged as that legal ONU distribution ONU is identified and OFDM subchannels, the ONU marks of foundation distribution and associating for OFDM subchannels.

20th, method as claimed in claim 19, it is characterised in that also include：

OLT sends the physical layer configuration parameter related to the first OFDM subchannels on the first OFDM subchannels with the first MAC protocol；

OLT sends the physical layer configuration parameter related to the 2nd OFDM subchannels on the 2nd OFDM subchannels with the second MAC protocol, wherein the physical layer configuration parameter includes at least one of OFDM gap markers and OFDM subcarrier informations. 21st, method as claimed in claim 19, it is characterised in that distribute OFDM subchannels for the ONU, including：

When the spectral range that ONU types are supported and the first OFDM subchannels are mismatched；Or, ONU types are mismatched with the MAC protocol that the first OFDM subchannels are carried；Or, when the bandwidth capacity of the first OFDM subchannels fails to meet the first ONU bandwidth demand, the 3rd OFDM subchannels of distribution give the first ONU, wherein, the 3rd OFDM subchannels meet one of following condition：

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

22nd, method according to claim 21, it is characterised in that methods described also includes：When the 3rd OFDM subchannels are different from the first OFDM subchannels, the OLT carries out second of ranging to the ONU.

23rd, method according to claim 22, it is characterised in that methods described also includes：When OLT is that the ONU distributes the 3rd OFDM subchannels, the bit carrying table of acquiescence is issued the ONU by OLT.

24th, method according to claim 22, it is characterised in that also include：The OLT issues descending training sequence to the ONU by the descending subchannels of the 3rd OFDM;

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

The OLT carries out third time ranging to the ONU.

25th, a kind of optical line terminal OLT, it is characterised in that including：

Memory, the mapping relation information for preserving each descending subchannel and MAC protocol； First media access control MAC module, for sending login request message by the first OFDM subchannels with the first MAC protocol；The registration request response message from the first ONU is received, judges whether the first ONU is legal, is the first ONU distribution ONU marks if legal；Ranging is carried out to the first ONU, is the first ONU distribution OFDM subchannels；

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

Wherein, the OFDM subcarriers that the first OFDM subchannels are included are different with the OFDM subcarriers that the first OFDM subchannels are included；First MAC protocol is the MAC protocol associated with the first OFDM subchannels, and second MAC protocol is the MAC protocol associated with the 2nd OFDM subchannels, and first MAC protocol is different from second MAC protocol；Physical medium associates PMD modules, for down direction, the data of the first PON MAC modules is received by the first OFDM subchannels, and be 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 is coupling in the PMD modules, one end is coupled with first MAC module and the second MAC module, and for the first OFDM subchannels to be associated with into the first PON MAC modules, the 2nd OFDM subchannels are associated with the 2nd PON MAC modules；When receiving ONU uplink optical signals, according to bandwidth allocation bitmap BWmap, the ofdm signal that the PMD modules are demodulated is sent to the first MAC module or the second MAC module.

26th, OLT according to claim 25, it is characterised in that the first MAC modules, is additionally operable to send the physical layer configuration parameter related to the first OFDM subchannels with the first MAC protocol by the first OFDM subchannels.

27th, OLT according to claim 25, it is characterised in that the first MAC modules, for for the first ONU allocation of downlink subchannels, specifically including：

When the spectral range that ONU types are supported and the first OFDM subchannels are mismatched；Or Person, ONU types are mismatched with the MAC protocol that the first OFDM subchannels are carried；Or, when the bandwidth capacity of the first OFDM subchannels fails to meet the first ONU bandwidth demand, the 3rd OFDM subchannels of distribution give the first ONU, wherein, the 3rd OFDM subchannels meet one of following condition：

The spectral range that first 0NU is supported is matched with the spectral range of the 3rd OFDM subchannels；The PON types that first ONU is supported are consistent with the PON types for the first PON MAC modules that the 3rd OFDM subchannels are associated；And the 3rd OFDM subchannels bandwidth capacity meet the first ONU bandwidth demand.

28th, OLT according to claim 27, it is characterised in that the first MAC modules, is additionally operable to when the 3rd OFDM subchannels are different from the first OFDM subchannels, to the

29th, the OLT according to claim 27 or 28, it is characterized in that, first MAC modules, are additionally operable to after OLT is that the first ONU is assigned with the 3rd OFDM subchannels, the upstream bits carrying table of renewal is sent to the ONU by the OLT.

30th, OLT according to claim 29, it is characterised in that the first MAC modules, is additionally operable to after the bit carrying table of renewal is sent to the ONU by OLT, to described

31st, a kind of optical line terminal OLT, it is characterised in that including：Processor, memory, bus and communication interface；The memory is used to store computer executed instructions, the processor is connected with the memory by the bus, when the computer is run, the computer executed instructions of memory storage described in the computing device, so that the computer performs the method as described in claim 19 ~ 24 any one.