CN101047470A - Allocation method for forward error correction function in passive optical network - Google Patents
Allocation method for forward error correction function in passive optical network Download PDFInfo
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Abstract
A method for configuring forward error correction function in passive optical network includes sending FEC energizing indication to ONU by OLT, carrying out verification on received FEC energizing indication by ONU, starting FEC function on data frame separately at ONU side and OLT side if FEC energizing indication is energized or otherwise stopping use of FEC function separately at ONU side and OLT side.
Description
Technical field
The present invention relates to fiber optic network access technology field, particularly forward error correction in the EPON (Forward Error Correction, FEC) collocation method of function.
Background technology
In the network access technique field, except full-blown Digital Subscriber Line (DigitalSubscriber Line) technology at present, the optical fiber access technology also is surging forward, particularly to put the EPON that multiple spot is a principal character (Passive Optical Network, PON) technology.The basic principle of PON net is under certain physical restriction and bandwidth constraints, allows terminal equipment as much as possible share local side apparatus and feed fiber.Because the optical fiber that this scheme needs is less, the optical interface cost of end office (EO) is lower, so it can provide than traditional point-to-point and the more economical high-speed light access way of loop configuration optical-fiber network for enterprise or residential customer.Main PON technology comprises at present: be applicable to asynchronous transfer mode (Asynchronous Transfer Mode, ATM) ATM Passive Optical Network (ATMPassive Optical Network, APON) and broadband passive optical network (Broadband PassiveOptical Network, BPON); Be applicable to Ethernet transmission ethernet passive optical network (EthernetPassive Optical Network, EPON); Be applicable to ATM and Ethernet the transmission gigabit speed EPON (Gigabit Passive Optical Network, GPON).Wherein GPON is the most comprehensive maturation of technology among current several PON, and compatible ATM and IP network can be supported multi-service, has advantages such as line speed height, maintenance management be perfect.
The PON system comprises following three parts: optical line terminal (Optical Line Termination, OLT), light distributed network (Optical Distribution Network, ODN) and optical network unit (OpticalNetwork Unit, ONU).Fig. 1 shows each part annexation schematic diagram of PON system.(Service Node Interface SNI), and connects ODN 102 to OLT 101, and in actual applications, an OLT can connect more than one ODN for the PON system provides SNI; ODN 102 is passive optical splitters parts, connects a plurality of ONU 103, is used for OLT 101 descending data are transferred to each ONU 103 along separate routes, the upstream data of a plurality of ONU 103 is gathered by time-multiplexed mode to be transferred to OLT 101 simultaneously; (User Network Interface's ONU 103 UNI), and links to each other with ODN 102 for the PON system provides User Network Interface.If ONU directly provides User Port Function, for example ethernet user's port or Plain Old Telephone Service (Plain OldTelephone Service, POTS) port, then be called Optical Network Terminal (Optical NetworkTermination, ONT).If no special instructions, the ONU that is mentioned below includes ONU and ONT.
The GPON downlink frame by down physical layer controll block (Physical control block downstream, PCBd) and effectively payload is formed, its frame structure as shown in Figure 2, wherein, PCBd is divided into from left to right:
(Physical Synchronization PSync), takies 4 bytes to physical layer synchronization, is used for frame is discerned;
Identification (Ident) field, take 4 bytes, its structure as shown in Figure 3, comprise the FEC indicating bit of 1 bit, the superframe counting (super frame counter) that 1 bit keeps position and 30 bits, wherein the FEC indicating bit is used to indicate this downlink frame whether to use the FEC coding, and the superframe counting is as the input parameter of downlink data encrypting and decrypting algorithm;
Down physical layer Operations,Administration And Maintenance (Physical Layer Operations, Administrationand Maintenance downstream, PLOAMd), take 13 bytes, comprise a physical layer operations and administer and maintain (Physical Layer Operations, Administration andMaintenance, PLOAM) message, described PLOAM message is used for the Operations,Administration And Maintenance (Operations of link setup process and link maintenance between OLT and ONU, Administration andMaintenance, OAM), the corresponding a kind of very concrete function of PLOAM type of message, as adjust luminous power message, dispense flow rate container (Transmission Container, T-CONT) message etc.
(Bit-Interleaved Parity BIP), takies 1 byte, preserves from a last frame bip field after the check value of all bytes before this frame bip field, and check results is added up as error code rate in the Bit Interleave verification;
(Payload Length downstream PLend), respectively takies 4 bytes to continuous two identical descending payload length, is used to indicate the length of effective payload of this downlink frame;
Upstream bandwidth mapping (upstream Bandwidth Map, US BW Map), take the mapping block of N 8 bytes, each mapping certainly comprises: Alloc id,, Flags, the initial moment (Start time), the finish time (Stop time) and five parts of Cyclic Redundancy Check.Have indicated the initial moment and the finish time initial sum final position point between the uplink frame sending area, Alloc id sign allows at this interval T-CONT that sends data, the ascending power that comprises 1 bit among the Flags is adjusted sequence (Power Levelling Sequence upstream, PLSu) transmission indicating bit, 1 bit upstream physical layer Operations,Administration And Maintenance (PLOAMu) transmission indicating bit, 1 bit FEC function are enabled indicating bit, the up dynamic bandwidth of 2 bits reports (Dynamic Bandwidth Report upstream, DBRu) transmission indicating bit.In uplink frame, PLSu is the fixed-length data that sends when being used for the power adjustment, and PLOAMu comprises a PLOAM message, and DBRu reports the relevant information of DBA algorithm needs according to the form of descending appointment.Wherein the transmission indicating bit value of PLSu, PLOAMu and DBRu is when allow sending, between corresponding up sending area in, ONU will send the uplink frame field of correspondence, otherwise not send; The FEC function is enabled indicating bit and is represented whether corresponding uplink frame uses the FEC coding.A plurality of mapping blocks can make the data of different ONU and different T-CONT all obtain sending in same uplink frame.
The GPON uplink frame is public by a plurality of ONU, one of them ONU sends frame structure partly as shown in Figure 4, the initial moment by the indication of downlink frame mapping block begins, comprise upstream physical layer expense (Physical Layer Overhead upstream, PLOu), PLOAMu, PLSu, DBRu and effective payload, up to the finish time of downlink frame mapping block indication, wherein PLOAMu, PLSu, DBRu require to add according to the indication in the upstream bandwidth mapping, so be optional.
PLOu comprises lead code (Preamble), demarcation sign indicating number (Delimiter), BIP, ONU sign (ONU-ID) and indication (Ind) field, lead code and delimit sign indicating number and be used for functions such as physical layer frame is synchronous, ONU-ID is the unique identification that OLT distributes to ONU, here report ONU-ID, be used for OLT and judge whether actual transmission situation meets descending distribution.
The frame structure of described PLOAM message as shown in Figure 5, long 13 bytes of PLOAM message, comprising: the ONU-ID of 1 byte is used for unique identification ONU equipment; The message identifier of 1 byte (Message id) expression type of message; The data of 10 bytes (Data) are used to deposit the particular content of message, because of type of message different; The CRC of 1 byte carries out the verification protection to 12 bytes in front.
Above-mentioned FEC is by to initial data coding, makes receiving terminal can directly check out the mistake of transfer of data generation from the data flow behind the coding, and a kind of code correction method of correction transmission error code that can be to a certain degree.Adopt the FEC method can reduce the error rate greatly, can under same reception result, save transmitted power.
The GPON standard-required uses the Reed-Solomon coding method in FEC at present.From frame head, the initial data of GPON frame is that unit is divided into several portions with 239 bytes, for the initial data of each 239 byte, calculates the FEC coding checkout word of 16 bytes, check word is added in after the initial data, forms the encoding block that 255 bytes are unit; For the initial data of last piece less than 239 bytes, the Character Filling with fixed value during calculation check becomes 239 bytes, calculate verification after, remove filling part, transmission be the initial data and the 16 byte verifications of less than 239 bytes.For example, GPON downlink frame shown in Figure 2, through FEC coding back form as shown in Figure 6.
The FEC function must be supported on OLT, does not support but be not that each ONU is necessary, neither enable.When ONU receives the downlink frame of FEC processing as receiving terminal, if this ONU supports the FEC function, then the initial data in this encoding block is carried out verification with the check word in each encoding block, find and correct wherein owing to transmit the mistake that causes, remove check word again and form the downlink frame of form as shown in Figure 2; If this ONU does not support the FEC function,, and check word is not dealt with then directly according to the initial data in the predefined encryption algorithm extraction encoding block.Using the FEC function in uplink frame is to adopt FEC mode to handle as transmitting terminal to the GPON uplink frame by ONU, and the GPON uplink frame after FEC being handled as receiving terminal by OLT is carried out error correction and recovery.
Use and inactive FEC function before, receiving terminal must be known the transmitting terminal FEC function of enabling or stopped using in some way in the Frame that is sent, receiving terminal process frames of data correctly like this, this is called the configuration of FEC function.The following mode of available technology adopting is carried out the configuration of FEC function:
At down direction, OLT is as transmitting terminal, with the FEC indicating bit of Ident field in the downlink frame PCBd field, whether the FEC function of representing this downlink frame is in enabled state, and value is that 0 expression FEC does not enable, and this frame does not carry out the FEC coding, value is that 1 expression FEC enables, and this frame has carried out the FEC coding; FEC indicating bit in the Ident field does not have the verification protection, does not more have the error correction protection, so FEC state indicating bit may be made mistakes.So the way that existing standard is taked is: default descending FEC function is closed, and ONU does not decode.When FEC was set to enable state, described FEC indicating bit was set to 1, and ONU receives that descending FEC indicating bit is at 1 o'clock continuous 4 times, and ONU approves that just descending FEC state has been set to enable; Processing method was identical therewith when descending FEC closed, so do not give unnecessary details.
At up direction, ONU represents with the FEC indicating bit that accounts for 1 bit in the Ind field in the uplink frame PLOu field whether this uplink frame FEC function is in enabled state as transmitting terminal, and value is that 0 expression FEC function does not enable, and value is that 1 expression FEC function enables.But in fact, OLT FEC function in the Flags field in the US of correspondence BW map piece is enabled indicating bit the up FEC encoding state of ONU is set, and back ONU is set should be changed at once, and the FEC indicating bit does not have practical function in the uplink frame.
There is following shortcoming in existing this FEC functional configuration method:
At down direction, be used to indicate the FEC indicating bit of the Ident field of FEC ena-bung function not have the verification protection, thereby be insecure, for preventing because the FEC indicating bit make mistakes and make ONU think that present FEC enabled state changes by mistake, so when ONU receives that continuously 4 FEC indicating bits in the downlink frame are all identical, and it is different with current FEC enabled state, approve that just the FEC enabled state changes, but the consequence that causes like this is: 3 own encoding states of message before ONU receives the 4th message change, but ONU is not approval also, is caused instantaneous packet loss so can not correctly handle; Because the FEC indicating bit that transmission error code causes is made mistakes also may cause and can not disposablely be received 4 correct FEC indicating bits continuously, causes ONU can not in time change the FEC state, further causes packet loss.
At up direction, only by the OLT decision, OLT does not have to obtain automatically the method for the FEC tenability of ONU in the variation that FEC enables, need the operator before configuration the FEC tenability of whole ONU of decorrelation, otherwise ONU does not support FEC, and OLT issues enable command, will cause chain rupture.This in actual use method has increased maintenance difficulties.
Summary of the invention
In view of this, the objective of the invention is to, propose the collocation method of FEC function among a kind of PON, can make FEC enable to indicate more reliable.This method comprises the steps:
A, optical line terminal OLT send FEC to optical network unit ONU and enable indication;
B, ONU enable indication to the FEC that is received and carry out verification, if execution in step C is then passed through in verification; If verification is not passed through, then withdraw from this flow process;
If the FEC that OLT sends enables to be designated as enable, the OLT side is enabled the FEC function to Frame and is handled; If the FEC that OLT sends enables to be designated as do not enable, the OLT side stops using the FEC function to handle to Frame; If ONU identifies described FEC and enables to be designated as and enable, then the ONU side is enabled the FEC function to Frame and is handled; If ONU identifies described FEC and enables to be designated as and do not enable, the ONU side stops using the FEC function to handle to Frame.
Preferably, the described transmission of steps A FEC enables to be designated as: send and have the physical layer operations that FEC enables indicating bit and administer and maintain PLOAM message;
Then step B is described enables indication to the FEC that is received and is verified as: the PLOAM message of being received that FEC enables indicating bit that has is carried out verification.
Described PLOAM message is: the PLOAM message that has the superframe sign.
Describedly the FEC function is enabled/stopped using to Frame handle and comprise:
OLT enables/stops using the FEC function to the corresponding downlink frame of the described superframe sign that will send and the downlink frame that sends afterwards and handles;
ONU enables/stops using the FEC function to the corresponding downlink frame of the described superframe sign of being received and the downlink frame received afterwards and handles.
Perhaps, describedly the FEC function is enabled/stopped using to Frame handle and comprise:
After the target ONU of described PLOAM message receives the downlink frame that described superframe sign is corresponding and receives downlink frame afterwards, to enable/stop using the FEC function to the uplink frame that OLT returns and handle;
OLT judges that the uplink frame received is whether from the target ONU of described pLOAM message, if then the FEC function is enabled/stopped using to described uplink frame and handle after sending the corresponding downlink frame of described superframe sign; Otherwise, handle according to original mode.
To after the FEC indication identification, further comprise: ONU returns confirmation to OLT to the described verification of step B by ONU among back or the step C;
: the OLT that is operating as of OLT side receives after the affirmation information of configuration target ONU among the then described step C, then according to the FEC indication that is sent the FEC function is enabled/stopped to Frame and handles.
The described transmission of steps A FEC enables indication and can enable to indicate for: OLT sends FEC with the mode of broadcasting.
Described PLOAM message is the up administrative effort UO message of activation.
The downlink frame of the described Frame of step C for beginning from distance measurement request.
The inventive method can also increase the check field to the FEC indication in the part beyond the downlink frame frame head independent message form; The described ONU of step B enables indication to the FEC that is received and is verified as: according to check field the FEC indicating bit is carried out verification.
Preferably, described check field is arranged at the reservation position of identification field.
Preferably, described ONU enables indication to the FEC that receives to carry out verification and comprise: when the FEC indicating bit of receiving changed, if the verification of use check field is passed through in the N continuous frame, and the value of FEC indicating bit was identical, then verification is passed through, otherwise verification is not passed through; Described N is the integer greater than 1.
The present invention also aims to, propose the collocation method of FEC function among a kind of PON, make ONU can report the FEC tenability of self to OLT.This method comprises the steps:
A, ONU are provided with the indication of FEC tenability according to the support situation of equipment of itself to the FEC function, and set FEC tenability indication is sent to OLT;
The FEC tenability of the ONU that b, OLT record is received.
Further comprise after the step b:
C, OLT carry out the FEC functional configuration according to the FEC tenability of the ONU that is received, and described functional configuration comprises that at least OLT does not enable up FEC function to not supporting the ONU of FEC.
Preferably, further comprise before the step a: OLT sends to ONU and requires ONU to carry out the request that the FEC tenability reports.
The described FEC of the setting tenability of step a is designated as the FEC tenability indicating bit that is provided with in the PLOAM message.
Described PLOAM message is the optical network unit string SN ONU message that reports to OLT when ONU is in the string state in the activation.
The described FEC of the setting tenability of step a is designated as: the FEC tenability field among the management entity ME that the ONU ability that can be used for of ONT management control interface OMCI reports is set.
As can be seen from the above technical solutions, carry FEC by PLOAM message and enable indication, because PLOAM message itself has CRC check, and the receiving terminal that FEC enables to indicate can send acknowledge message notice transmitting terminal, therefore it is more reliable that FEC enables indication, thereby avoided in the prior art because FEC enables to indicate the unreliable frame losing phenomenon that causes; Perhaps, improve the reliability that FEC enables to indicate, reduce the frame losing phenomenon in the FEC enabled state change process by in downlink frame, increasing check field to descending FEC indication field; Can also carry up FEC tenability indication by PLOAM message, perhaps carry up FEC tenability indication by OMCI ME, make ONU can report OLT to the tenability of FEC function, OLT can understand ONU to the basis of FEC function tenability on configuration FEC function, thereby reduce artificial maintenance work, avoid in the prior art because OLT sends the chain rupture phenomenon that the FEC enable command causes to the ONU that does not support the FEC function.
Description of drawings
Fig. 1 is a PON system network architecture schematic diagram;
Fig. 2 is a GPON downlink frame structural representation;
Fig. 3 is the structural representation of the identification field in the GPON downlink frame;
Fig. 4 is a GPON uplink frame structural representation;
Fig. 5 is a PLOAM message format schematic diagram;
Fig. 6 is a GPON downlink frame structural representation behind the employing FEC function coding;
Fig. 7 is in the FEC functional configuration process of the embodiment of the invention one down direction, the process chart of ONU;
Fig. 8 sends the process chart that clean culture enables the OLT of FEC control messages for the embodiment of the invention one to specific ONU;
Fig. 9 is the activation flow chart of prior art to ONU;
Figure 10 is the structural representation of the embodiment of the invention three amended GPON downlink frame identification field.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is further elaborated below in conjunction with accompanying drawing.
Core content of the present invention is: adopted the advice method with data protection by OLT, whether notice ONU enables the FEC function, ONU receives the notice of enabling the FEC function, after the process verification is errorless, then whether enables the FEC mode and handle the Frame that maybe will send that receives according to the notice decision of being received; Adopt the advice method with data protection by ONU, self is reported OLT to the tenability of FEC function, OLT carries out FEC functional configuration or other bookkeepings according to the tenability of understanding ONU to the FEC function.
Adopt specific embodiment to divide OLT notice ONU whether to enable the FEC function below and ONU reports these two aspects of FEC tenability that content of the present invention is described further.
Embodiment one: realize by defining new PLOAM message whether OLT notice ONU enables the FEC function.
Be the existing GPON chip of compatibility, OLT can be by being carried the mode of FEC enabler flags by newly-increased PLOAM message, and whether notice ONU enables the FEC function.Because PLOAM message itself has CRC check, therefore adopt this method, its FEC enabler flags is more more reliable than the FEC enable bit in the prior art downlink frame Ident field.
To achieve the above object of the invention, present embodiment adopts the PLOAM message of a special definition to realize the configuration of down direction FEC function, and defined PLOAM message is called FEC control messages (FECControl Message), and its particular content is as shown in table 1:
| Byte number | Content | Value and description thereof |
| 1 | The target indication | ONU-ID: represent the target ONU that this message issues, " 0xFF ": represent that this message is for to broadcast to all ONU that this OLT connected. |
| 2 | Message identifier | " 00010100 " shows that this message is the FEC control messages. |
| 3 | Descending FEC enabler flags | " 00000001 ": descending FEC enables, " 00000000 ": descending FEC does not enable. |
| 4 | |
Low 6 is the high 6 of first superframe ID of coming into force of FEC enabled state, high 2 reservations, and value gets 0. |
| 5,6 | Frame count 2,3 | The interposition of first superframe ID that the FEC enabled state comes into force. |
| 7 | Frame count 4 | The least-significant byte of first superframe ID that the FEC enabled state comes into force. |
| 8-12 | Keep the position | Undefined. |
| 13 | The CRC check position | Be used for this message content is carried out CRC check. |
Table 1
As can be seen from Table 1, comprise the superframe ID that target indication, message identifier, descending FEC enabler flags and descending FEC enabled state come into force in the FEC control messages.Wherein, the content of target indication is if ONU-ID shows that this message is unicast messages, and the target that sends is the pairing ONU of ONU-ID; The content of target indication is if 0xFF shows that this message is broadcast, and the target that sends is all ONU of this OLT connection.Message identifier has been represented the type of this message, in the present embodiment, " 00010100 " is defined as the message identifier of FEC control messages, in fact also the message identifier of FEC control messages can be defined as other values.
Adopt the FEC control messages shown in the table 1, in the FEC functional configuration process of down direction, the handling process of ONU comprises the steps: as shown in Figure 7
Step 701:ONU receives the descending PLOAM message from OLT, and receiving message is carried out CRC check, judges whether that verification passes through, if then execution in step 702, otherwise abandons this message and process ends;
Step 702: according to the content of the 2nd byte in the message, determine that this message is the FEC control messages, judge that the target in this message the 1st byte indicates whether and the ONU-ID coupling of this equipment,, otherwise finish this handling process if then execution in step 703; Described coupling has two kinds of situations, and the one, the content in the target indication is consistent with the ONU-ID of this equipment, and the 2nd, the target instruction content shows that this message is broadcast, i.e. the content of target indication is 0xFF; If according to the content of the 2nd byte in the message, determine that this message is other types message, then to handle according to corresponding handling process, concrete processing procedure is not a content of the present invention.
Step 703: the superframe ID that writes down the 4th byte to the 7 bytes in this message, enabling indication according to the FEC of the 3rd byte determines to enable or to close the FEC function, and return the affirmation message that has ONU-ID to OLT, if receive this acknowledge message, OLT ONU has as can be known accepted the FEC functional configuration;
Step 704:ONU receives the downlink frame from OLT, judges whether the superframe ID of the downlink frame of receiving mates with the superframe ID that has write down, if then execution in step 705, otherwise handles downlink frame by existing FEC encoding state, and this step is carried out in the back continuation that disposes;
Step 705: whether support the FEC function according to the descending FEC encoding state of record in the step 703 and according to this ONU equipment, this superframe and the superframe received are afterwards carried out respective handling: enable descending FEC coding if be recorded as, the downlink frame that ONU receives comprises the FEC coding, when this ONU equipment is supported the FEC function, then this superframe and the superframe received afterwards being carried out the FEC error correction decoding handles, when this ONU equipment is not supported the FEC function, then extract this superframe according to predefined encryption algorithm and the superframe received afterwards in initial data.Close descending FEC coding if be recorded as, the downlink frame that ONU receives does not have the FEC coding, and this ONU equipment is directly handled the frame of receiving.
Figure 8 shows that to specific ONU to send the handling process that clean culture enables the OLT of FEC control messages, comprise the steps that wherein, the FEC enabler flags is set to enable:
Step 801: generate a FEC control messages, described FEC control messages comprises target ONU-ID, the predetermined superframe ID of FEC function, the descending FEC enabler flags etc. of enabling according to content-defined shown in the table 1;
Step 802: send the FEC control messages that is generated to down direction;
Step 803: judge whether to receive affirmation message,, otherwise continue to handle downlink frame, perhaps redefine the superframe ID that enables the FEC function and go to step 801 by existing FEC functional status if then execution in step 804 from ONU; For fear of being absorbed in endless loop, can number of times that retransmit the FEC control messages be limited, if surpass that certain number of times is not also received acknowledge message then by existing FEC functional status processing downlink frame; The specific practice of described judgement can be to judge whether to receive acknowledge message before the superframe that sends predetermined ID; Perhaps when step 802 sends the FEC control messages, start the timer of scheduled duration, judge to be to judge whether before this timer expiry, to receive acknowledge message herein;
Step 804: to predetermined ID number with and subsequent superframe enable the FEC encoding process, send superframe to down direction again.
Carry the situation of descending FEC enabler flags for the FEC control messages, can provide corresponding flow process according to flow process shown in Figure 7, so repeat no more for not enabling.
If this FEC control messages is the message of broadcasting, except the 1st byte of FEC control messages according to changing into shown in the table 1 0xFF, step 803 is described to be judged as: the affirmation message that judges whether to receive all ONU that are registered to this OLT, specific practice is: after receiving the affirmation message from ONU, write down the ONU-ID in this acknowledge message, when the ONU-ID of the ONU-ID that is write down and local storage all meets, then think the affirmation message of having received all ONU.If surpass the affirmation message that the flow process guard time is not still received all ONU, then can send one time the FEC control messages again, trigger the FEC functional configuration again.For fear of being absorbed in endless loop and considering unsuitable factor such as oversize of operating time, the described number of times that triggers again can be set at 1.
In the present embodiment scheme, have CRC check, guarantee that its FEC enabler flags is more reliable owing to carry the PLOAM message of FEC enabler flags; Moreover, use superframe ID to determine the FEC functional status change time, and ONU receives that the FEC enabler flags will return confirmation, make in the process of FEC functional configuration, avoided packet loss.
The present embodiment scheme also can be used for the FEC functional configuration of up direction.The definition that is used to carry out the PLOAM message of up direction FEC functional configuration duplicates in table 1, and just wherein the message identifier of second byte should be different with other PLOAM message, show that this message is to be used for up FEC control messages.According to the PLOAM message that described mode defines, to carry out in the up FEC functional configuration process, the handling process of ONU also duplicates in Fig. 7, and just wherein step 704 becomes:
ONU receives the downlink frame from OLT, judges whether the superframe ID of the downlink frame of receiving mates with the superframe ID that has write down, if then execution in step 705, otherwise handles uplink frame by existing FEC encoding state, and this step is carried out in the back continuation that disposes;
Step 705 becomes: according to the up FEC encoding state of record in the step 703, carry out respective handling to receiving the uplink frame that sends after this descending superframe: enable up FEC coding if be recorded as, the uplink frame that sends after is then enabled the FEC function and is encoded; Close up FEC coding if be recorded as, then the uplink frame that sends does not afterwards use the FEC function to encode.
Certainly, also up-downgoing FEC control messages can be merged into a message, the field that increases the expression upstream or downstream in message gets final product.
Embodiment two: existing PLOAM message is expanded, to realize the configuration of down direction FEC function.
Before GPON normally carries out business, at first to be configured ONU by activation, present embodiment promptly is to increase descending FEC to enable control in the existing P LOAM of activation message.
At first activation is described.Each ONU equipment all has unique, as a to bind string number (serial number).OLT only can dispose and to allow to insert the management that some string number comes equipment is inserted authority, also can not limit, and this mode is called automatic discovery.In normal activation, the ONU state that relates to has initial condition (Initial-state), holding state (Standby-state), string state (Serial-Number-state), distance measuring states (Ranging-state) and service condition (Operation-state), and above ONU state abbreviates O1 state, O2 state, O3 state, O4 state and O5 state respectively as.
The activation process of existing standard regulation comprises the steps: as shown in Figure 9
Initial condition was O1 when step 901:ONU powered on, this locality be in dropout (lose of signal, LOS) or frame losing (lose offrame, LOF) alarm status; OLT sends downlink data to ONU; In case receive data, LOS and LOF alarm clearance, the ONU O2 state of moving into from OLT;
Step 902:OLT sends up administrative effort (Upstream_Overhead to ONU, UO) message, this message is that OLT is broadcast to all ONU, wherein indicate ONU and sent the field formats such as physical layer demarcation of data use, initial luminous power pattern etc., after the ONU that is in the O2 state receives this message, according to message parameter configuration oneself, next state O3 then moves into;
Step 903:OLT sends string number (Serial_Number, SN) request to all ONU broadcasting;
After step 904:ONU receives request, report ONU string number (Serial_Number_ONU, SN_ONU) message, wherein information has string number, whether supports ATM/GPON method for packing (GPONEncapsulation Method, GEM) transfer of data, current luminous power pattern etc.;
After step 905:OLT receives SN_ONU message, to the string that allow to insert number, then use and distribute ONU-ID (Assign_ONU-ID) message to distribute ONU-ID for each ONU, the ONU-ID field of this message is still broadcasting, number identification is to give whose ONU-ID to ONU according to the string in the message content, obtain the ONU of ID, enter the O4 state;
The SN_ONU requested feature is the BW map piece that comprises in the downlink frame, and Alloc id value wherein is 254, and expression is to be broadcast to all ONU, and when a plurality of ONU received this request, the method for employing random delay was avoided the conflict of response data.
Step 906:OLT sends range finding (Ranging) request to specific ONU;
After step 907:ONU receives distance measurement request, return SN_ONU message to OLT, this SN_ONU and step 904 are identical to the SN_ONU message content that OLT returns;
Step 908:OLT measures the time-delay of the SN_ONU message of receiving, calculate equivalence time-delay (the Equalization Delay of this ONU, EqD), and carry measured EqD value with range finding time (Ranging_Time) message and be sent to this ONU, ONU receives RT message and with the EqD value configuration of the receiving O5 state that goes down promptly to move into.
After entering the O5 state, even if ONU has activated, transmission upstream data that can be correct and having carried out from the message of OLT.
When the ONU of different distance inserts same OLT light mouth, the moment that the same downlink frame broadcasting of OLT arrives each ONU is variant, and the up transmission of ONU is to pick up counting from the moment that receives downlink frame, so OLT need find that each ONU is to the difference between the OLT distance with ranging process, and by each ONU is distributed a delay value, make all ONU it seems to seem to be on the position same far away to OLT, this time-delay is EqD.In the UO message that step 902 sent, OLT distributes to the same initial EqD value of all ONU; Step 906～908OLT carries out range operation to single ONU, redistributes an accurate EqD value.
The identical SN_ONU request of the form of distance measurement request, but the alloc id among the current BW map gets the ID of the ONU that participates in this range finding.Two PLOAM message that ONU and OLT send also need to specify the id of this ONU.
After the activation, also need to have set up ONT management control interface (ONT Managementand Control Interface on the ONU, OMCI) employed ATM or GEM passage, as distribute the port-mark or VCI (the Virtual Path Identifier of OMCI passage, VPI), VPI (Virtual Channel Identifier, start-up operations such as VCI), other service channels are set up afterwards, configuration data issues are all finished by the OMCI passage.After whole starting process was finished, PLOAM message also needed to handle the mutual of information such as the link maintenance between OLT and the ONU and order, enabled as alarm reception and registration, the passage encryption function of link failure indication etc.
Present embodiment enables control field and realizes the object of the invention by increase descending FEC in activation existing P LOAM message, and specifically being increases descending FEC in the 10th byte of UO message to enable control field, and the UO message content of present embodiment is as shown in table 2:
| Up administrative effort (UO) message | ||
| Byte number | Content | Value and |
| 1 | The target indication | " 0xFF ": this message is for to broadcast to all ONU that this OLT connected. |
| 2 | Message identifier | 00000001: show that this message is UO message. |
| 3 | The protected field number | The number that shows protected field (Guard Bits). |
| 4 | First kind boot field number | The number of first kind boot field ( |
| 5 | The second class boot field number | Can be made as zero. |
| 6 | The 3rd class boot field type | The employed type of the 3rd class boot field. |
| 7 | Physical layer is delimited field | The physical layer of delimiter first byte regulation is delimited data. |
| 8 | Physical layer is delimited field | The physical layer of delimiter second byte regulation is delimited data. |
| 9 | Physical layer is delimited field | The physical layer of delimiter the 3rd byte regulation is delimited data. |
| Up administrative effort (UO) message | ||
| Byte number | Content | Value and |
| 10 | Fxemsspp | F: descending FEC enable bit; " 0 "=descending FEC does not enable; " 1 "=descending FEC enables; X: keep the position; E: pre-equilibration mechanism state; " 0 "=not uses the equivalence time-delay, and " 1 "=use equivalence to delay time; M:SN hides machine-processed state; " 0 "=SN hides, and " 1 "=SN does not hide; Ss: the maximum that single SN request is sent SN; Pp: acquiescence ONU transmission power level pattern; " 00 "=pattern 0, general mode; " 01 "= |
| 11 | Equivalence time-delay (EqD) | The most-significant byte of EqD that will assignment |
| 12 | Equivalence time-delay (EqD) | The least-significant byte of EqD that will assignment |
| 13 | The CRC check position | Be used for this message content is carried out CRC check. |
Table 2
According to table 2, the f position of the 10th byte is descending FEC enable bit, and regulation will be enabled the FEC function in distance measurement request and downlink frame afterwards thereof.By such definition, the handling process that has the ONU activation of descending FEC configuration feature is on the process base shown in Figure 9, to do following variation:
In the step 902, the UO message of OLT broadcasting is that ONU receives this UO message according to the UO message of carrying descending FEC enable bit shown in the table 2, by the value of the descending FEC enable bit of record behind CRC check and the message inspection; If UO message not by CRC check and message inspection, is then handled according to the corresponding flow process of prior art; Described message inspection comprises the inspection to type of message, target identification.
In the step 906, the described transmission distance measurement request of OLT is: if the FEC enable bit in the UO message in the step 902 is set to enable, then enable the FEC function distance measurement request is encoded, and the distance measurement request after will encoding is sent to ONU; And the later downlink frame that sends is all enabled the FEC function coding, otherwise sends distance measurement request according to original mode;
In the step 907, after ONU receives distance measurement request, whether the value decision according to the descending FEC enable bit that is write down enables the FEC function, if, then enabling the FFC function decodes to the distance measurement request of being received, and to after the downlink frame received all enable the decoding of FEC function, otherwise handle according to original mode.
Embodiment three: with the reservation position of the downlink frame Ident field check code as descending FEC indicating bit, realize down direction FEC functional configuration.
The FEC functional configuration scheme of existing down direction in the prior art; its problem only is that the FEC indicating bit in its downlink frame Ident field does not have the verification protection; present embodiment is exactly that existing FEC indicating bit is increased the verification protection, can realize the object of the invention on the basis of minimum modification existing protocol like this.
According to the present embodiment scheme, the structure of existing downlink frame Ident field shown in Figure 3 becomes form shown in Figure 10, and wherein FEC indicating bit and superframe counting remains unchanged, and former reservation position becomes FEC indication check digit, and its coding rule is as follows:
During as odd, the bit number that FEC indicating bit and these two bit intermediate values of FEC indication check digit are got " 1 " is an odd number; During even parity check, the bit number that FEC indicating bit and FEC indication check digit intermediate value are got " 1 " is an even number.
When ONU receives downlink frame, the value of FEC indicating bit and FEC indication check digit is judged, if satisfy above-mentioned rule, judge that then verification passes through, and whether enable the FEC function according to the value decision of FEC indicating bit; Otherwise verification is not passed through, and does not change the situation of enabling of FEC function.Like this, under the situation that these 2 bits are not made mistakes simultaneously, can play the effect of protection FEC indicating bit.
For further improving the reliability of verification, described ONU enables indication to the FEC that receives to carry out verification and can comprise: when the FEC indicating bit of receiving changes, if using the check digit verification in the N continuous frame passes through, and the value of FEC indicating bit is identical, then verification is passed through, otherwise verification is not passed through.The value of described N is that fixing or network side preestablishes in the system, generally can be set to 2.
More than three embodiment described for whether OLT notice ONU enables the FEC function, below two embodiment report self FEC tenability for ONU to OLT, OLT is configured the FEC function according to the FEC tenability of the ONU that is received.
Embodiment four: existing PLOAM message is expanded, realized that the FEC ability of ONU reports.
Present embodiment is for to expand the SN_ONU message in the activation.Because the O3 state is identical SN_ONU message with the message that O4 state ONU reports, in the present embodiment A bit of expression ATM tenability in the SN_ONU message of giving the correct time on the O3 state is changed into the F bit of the FEC tenability of expression ONU, under the O4 state, SN_ONU message is constant.
Like this, have and make to increase following processing procedure on the basis that activation that the FEC function of ONU reports is flow process shown in Figure 9:
In the step 904, in the SN_ONU message that ONU reports, represented originally that the A bit of ATM tenability became the F bit of expression FEC tenability, and the FEC tenability was provided with the value of F bit according to the ONU equipment of itself, if support then be set to 1, if do not support then be set to 0;
In the step 905, OLT receives SN_ONU message and by behind CRC check and the message inspection, notes the FEC tenability indication of the value of F bit as corresponding ONU; If SN_ONU message not by CRC check and message inspection, is then handled according to the corresponding flow process of prior art.
In the step 906, if OLT needs ONU to start up FEC function, OLT is according to the value of the F bit that is write down, FEC function in the up broadband map field in the distance measurement request is enabled indication to be provided with: if the F bit in the SN_ONU message is set to 1, promptly support the FEC function, then the indication of the FEC function in the distance measurement request also is set to 1, promptly enables the FEC function; If the F bit in the SN_ONU message is set to 0, promptly do not support the FEC function, then the indication of the FEC function in the distance measurement request also is set to 0, does not promptly enable the FEC function.If do not need to start up FEC function, then in the distance measurement request in the upstream bandwidth map field FEC function enable indicated value and remain 0;
OLT can enable indication to the FEC function of wherein up broadband map field according to the value of the F bit that is write down and be provided with when sending other downlink frame.
In the step 907, the ONU judgement FEC function in the distance measurement request of receiving is enabled indication, if be set to 1, promptly enables the FEC function, then will carry out the FEC encoding process to the SN_ONU message of distance measurement request response, sends the SN_ONU message after handling again; If be set to 0, then do not enable the FEC function;
If receive other downlink frame, need that also FEC function is wherein enabled indication and judge, and whether the uplink frame that sends after receiving this downlink frame is being changed the FEC functional status according to result's decision of judging.
The above makes it carry FEC tenability indicating bit for the PLOAM message in the existing activation is made amendment, and reaches the purpose that reports the FEC ability.Also can make amendment, make it can carry FEC tenability indicating bit other up PLOAM message; Perhaps the way of similar embodiment one defines one and is specifically designed to the PLOAM message that reports the FEC ability.Adopting PLOAM message to carry out the general step that the FEC ability reports is summarized as follows:
Step a:ONU sends the PLOAM message have FEC ability indicating bit to OLT, and whether the value of described FEC ability indicating bit supports the FEC ability to be provided with according to self ONU equipment;
Step b:OLT carries out verification to the PLOAM message of the FEC ability that the has indicating bit received, if verification is passed through, writes down the wherein value of FEC ability indicating bit, as the FEC ability indication of the ONU of correspondence; If verification is not passed through, then PLOAM message is carried out the obstructed out-of-date treatment step of verification carry out respective handling according to existing.
Carried out after the above-mentioned steps, when needs started up FEC, OLT was according to the FEC ability indication of the ONU that is write down, and the FEC function that the up BW MAP field in the downlink frame that sends is set is enabled indication.
Before above-mentioned steps a, can increase following steps: OLT and send the request that reports the FEC tenability to ONU.
Embodiment five: realize that by the OMCI protocol massages FEC tenability reports.
OMCI is the ONU management interface, and OLT, can use for webmaster by the ONU information that the OMCI passage obtains as the management-side of OMCI, also can use for OLT is local.The organization unit of OMCI information of managing is management entity (Management Entity, ME), a ME is the set of a class relevant information, the object that can discern and operate as webmaster, all ME according to correlation form a tree-like management information base (Management Information Base, MIB).ME is made of field, and field is can read and write for management-side to wait a variable of operating.For the OMCI message corresponding C RC verification safeguard measure is arranged also.Standard has defined and has been used for the OMCI ME that the ONU ability reports, and the field that only need increase an expression FEC tenability at the ME that the existing ONU of being used for ability reports gets final product.
Realize that by OMCI ME the step that the FEC ability reports is:
Step a ': ONU sends the OMCI message to OLT, wherein comprises the value of FEC tenability field among the OMCI ME, and whether the value of this FEC ability indicating bit supports the FEC ability to be provided with according to the ONU equipment self;
Step b ': OLT to receive that having FEC ability indicating bit OMCI message carries out CRC check and other message validities and matching check, if verification and inspection are passed through, write down the wherein value of FEC ability indicating bit, as the FEC ability indication of the ONU that sends described OMCI message; If verification is not passed through, the treatment step that does not pass through according to existing OMCI message checking carries out respective handling.
Carried out after the above-mentioned steps, when needs started up FEC, OLT was according to the FEC ability indication of the ONU that is write down, and the FEC function that the up broadband map field in the downlink frame that sends is set is enabled indication.
At above-mentioned steps a ' before, also can increase following steps: OLT and send the request that reports the FEC tenability to ONU.
Though the above embodiment is to be example with GPON, but those skilled in the art will be appreciated that, owing to have very strong technology correlation between the various PON technology, the inventive method can be applied in the PON system of other types, in the PON of future generation system that particularly develops on the GPON basis.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1, the collocation method of forward error correction FEC function in a kind of EPON is characterized in that this method comprises the steps:
A, optical line terminal OLT send FEC to optical network unit ONU and enable indication;
B, ONU enable indication to the FEC that is received and carry out verification, if execution in step C is then passed through in verification; If verification is not passed through, then withdraw from this flow process;
C, if the FEC that OLT sends enables to be designated as to enable, the OLT side is enabled the FEC function to Frame and is handled; If the FEC that OLT sends enables to be designated as do not enable, the OLT side stops using the FEC function to handle to Frame; If ONU identifies described FEC and enables to be designated as and enable, then the ONU side is enabled the FEC function to Frame and is handled; If ONU identifies described FEC and enables to be designated as and do not enable, the ONU side stops using the FEC function to handle to Frame.
2, method according to claim 1 is characterized in that, the described transmission of steps A FEC enables to be designated as: send and have the physical layer operations that FEC enables indicating bit and administer and maintain PLOAM message;
Then step B is described enables indication to the FEC that is received and is verified as: the PLOAM message of being received that FEC enables indicating bit that has is carried out verification.
3, method according to claim 2 is characterized in that, described PLOAM message is: the PLOAM message that has the superframe sign.
4, method according to claim 3 is characterized in that, describedly the FEC function is enabled/stopped using to Frame handles and comprises:
OLT enables/stops using the FEC function to the corresponding downlink frame of the described superframe sign that will send and the downlink frame that sends afterwards and handles;
ONU enables/stops using the FEC function to the corresponding downlink frame of the described superframe sign of being received and the downlink frame received afterwards and handles.
5, method according to claim 3 is characterized in that, describedly the FEC function is enabled/stopped using to Frame handles and comprises:
After the target ONU of described PLOAM message receives the downlink frame that described superframe sign is corresponding and receives downlink frame afterwards, to enable/stop using the FEC function to the uplink frame that OLT returns and handle;
OLT judges that the uplink frame received is whether from the target ONU of described PLOAM message, if then the FEC function is enabled/stopped using to described uplink frame and handle after sending the corresponding downlink frame of described superframe sign; Otherwise, handle according to original mode.
According to each described method of claim 1 to 5, it is characterized in that 6, to after the FEC indication identification, further comprise: ONU returns confirmation to OLT to the described verification of step B by ONU among back or the step C;
: the OLT that is operating as of OLT side receives after the affirmation information of configuration target ONU among the then described step C, then according to the FEC indication that is sent the FEC function is enabled/stopped to Frame and handles.
7, method according to claim 6 is characterized in that, the described transmission of steps A FEC enables to be designated as: OLT sends FEC with the mode of broadcasting and enables indication.
8, method according to claim 2 is characterized in that, described PLOAM message is the up administrative effort UO message of activation.
9, method according to claim 8 is characterized in that, the downlink frame of the described Frame of step C for beginning from distance measurement request.
10, method according to claim 1 is characterized in that, increases the check field to the FEC indication in the part beyond the downlink frame frame head independent message form;
The described ONU of step B enables indication to the FEC that is received and is verified as: according to check field the FEC indicating bit is carried out verification.
11, method according to claim 10 is characterized in that, described check field is arranged at the reservation position of identification field.
12, according to claim 10 or 11 described methods, it is characterized in that, described ONU enables indication to the FEC that receives to carry out verification and comprises: when the FEC indicating bit of receiving changes, if using the check field verification in the N continuous frame passes through, and the value of FEC indicating bit is identical, then verification is passed through, otherwise verification is not passed through; Described N is the integer greater than 1.
13, the collocation method of FEC function in a kind of EPON is characterized in that this method comprises the steps:
A, ONU are provided with the indication of FEC tenability according to the support situation of equipment of itself to the FEC function, and set FEC tenability indication is sent to OLT;
The FEC tenability of the ONU that b, OLT record is received.
14, method according to claim 13 is characterized in that, further comprises after the step b:
C, OLT carry out the FEC functional configuration according to the FEC tenability of the ONU that is received, and described functional configuration comprises that at least OLT does not enable up FEC function to not supporting the ONU of FEC.
15, method according to claim 13 is characterized in that, further comprises before the step a: OLT sends to ONU and requires ONU to carry out the request that the FEC tenability reports.
According to claim 13,14 or 15 described methods, it is characterized in that 16, the described FEC of the setting tenability of step a is designated as the FEC tenability indicating bit that is provided with in the PLOAM message.
17, method according to claim 16 is characterized in that, described PLOAM message is the optical network unit string SN_ONU message that reports to OLT when ONU is in the string state in the activation.
According to claim 13,14 or 15 described methods, it is characterized in that 18, the described FEC of the setting tenability of step a is designated as: the FEC tenability field among the management entity ME that the ONU ability that can be used for of ONT management control interface OMCI reports is set.
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