CN101867442A - Uplink forward error correction processing method, optical networking unit and optical line terminal - Google Patents
Uplink forward error correction processing method, optical networking unit and optical line terminal Download PDFInfo
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- CN101867442A CN101867442A CN200910134445A CN200910134445A CN101867442A CN 101867442 A CN101867442 A CN 101867442A CN 200910134445 A CN200910134445 A CN 200910134445A CN 200910134445 A CN200910134445 A CN 200910134445A CN 101867442 A CN101867442 A CN 101867442A
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Abstract
The invention discloses an uplink FEC processing method, an ONU and an OLT. The method is used for increasing FEC for uplink frame burst according to the FEC encoding mode for the ONU, and comprises: uplink frame burst is set on the ONU, wherein the ONU sets all the FEC in the uplink frame burst in a concentration way. The invention solves the problem that after being corrected by FEC, the function of the DBA in the OLT and the function of the uplink frame burst in the ONU become complex, thus simplifying the function of the DBA in the OLT and the function of the uplink frame burst in the ONU for forming uplink frame burst.
Description
Technical field
The present invention relates to the communications field, particularly, relate to a kind of uplink forward error correction (Forward error correction, abbreviate FEC as) processing method, optical network unit (Optical Network Unit abbreviates ONU as) and optical line terminal (Optical LineTerminal abbreviates OLT as).
Background technology
Gigabit passive optical network (Gigabit Passive Optical Network, abbreviate GPON as)/10 gigabit passive optical networks (10-gigabit Passive Optical Network, abbreviating XGPON as) system is made up of OLT, ONU and Optical Distribution Network (OpticalDistribution Network abbreviates ODN as) usually.ODN is generally single-point to multipoint configuration, that is, an OLT connects a plurality of ONU by ODN.
The GPON system is by ITU-T series standard definition standard G.984, XGPON is FSAN (Full Service Access Network, abbreviate FSAN as) next-generation passive optical network (the Passive Optical Network that proposes of tissue, abbreviate PON as), in March, 2009, XGPON was in the Technical White Paper for stage, and FSAN will be base growth XGPON with the GPON standard.Therefore will be that example illustrates the problem that exists in the up FEC processing with the GPON system below.
The GPON system adopts time division multiplexing to insert (Time DivisionMultiplex Access abbreviates TDMA as) access mechanism at up direction, that is, ONU could send data at up direction after OLT distributes upstream bandwidth for it.OLT is that ONU distributes upstream bandwidth by Dynamic Bandwidth Allocation (Dynamic Bandwidth Assignment abbreviates DBA as) function, and by allocated bandwidth figure (Bandwidth Map abbreviates BWmap as) upstream bandwidth of distributing is sent to each ONU.Fig. 1 is the schematic diagram according to the GPON allocated bandwidth of correlation technique, the BWmap form of GPON system as shown in Figure 1, Upstream BWMap is the upstream bandwidth distribution diagram, comprise N upstream bandwidth structure, each upstream bandwidth structure comprises: allocation identification (Allocation Identifier, abbreviate Alloc-ID as), flag bit (Flags), time started (StartTime), concluding time (StopTime), cyclic redundancy check (CRC) (Cyclical Redundancy Check, abbreviate CRC as), the allocated bandwidth of expression from StartTime to StopTime is to relevant transmission container (the Transmission Container of Alloc-ID, abbreviate T-CONT as), the information that Flags is used for pointing out ONU to send at this upstream bandwidth, wherein, the bit 6-0 in Flags territory is for keeping the territory, can be used for expanded function, and CRC error checking and error correcting function are provided.
The upstream bandwidth that OLT distributes to the different T-CONT of same ONU can be continuous, also can be discontinuous.Suppose two T-CONT (being respectively T-CONT1 and T-CONT2) of same ONU, the upstream bandwidth that OLT distributes to T-CONT1 is (StartTime1, StopTime1), the upstream bandwidth of distributing to T-CONT2 is (StartTime2, StopTime2), if StartTime2 is bigger by 1 than StopTime1, the upstream bandwidth that T-CONT1 and T-CONT2 are distributed in expression is continuous.When continuous some upstream bandwidths were distributed to same ONU, ONU can utilize these upstream bandwidths to be assembled into a uplink burst (Upstream Burst).Fig. 2 is the schematic diagram according to the GPON uplink burst frame structure of correlation technique; as shown in Figure 2; wherein two assignment interval (Allocation interval) are distributed to two continuous upstream bandwidths (OLT relies on the local allocated bandwidth figure that preserves and resolves this two Allocationinterval) of ONU for OLT; Guard Time is a guard time; be used to prevent two in succession successively luminous ONU produce luminous conflict at up direction; leading (Preamble) and delimiter (Delimiter) are used for the beginning of a uplink burst of OLT identification; Guard Time; Preamble and Delimiter form burst mode expense (Burst mode overhead); bit interleaves verification (Bit Interleaved Parity abbreviates BIP as) and is used for fault-tolerant processing; ONU sign (ONU-ID) expression sends the sign of the ONU of this uplink burst; the partial content of OLT in this uplink burst informed in up indication (Ind).BIP, ONU-ID and Ind form uplink burst head (Burst header), and Preamble, Delimiter and uplink burst head are formed upstream physical layer expense (Physical Layer Overhead upstream abbreviates PLOu as).The DBA function of OLT should be reserved corresponding bandwidth for Guard Time, Preamble, Delimiter, BIP, ONU-ID and Ind, but these bandwidth reserveds are not embodied among the BWmap.
For on improving/reliability of downlink transfer, the GPON system also supports/descending FEC function, FEC adopts Read-Solomon (Reed-Solomon) RS (255,239) coded system, that is, per 239 byte datas increase by 16 byte FEC verifications, for the data of less than 239 bytes, replenish 0 earlier in the data front to reach 239 bytes, then 239 byte datas of replenishing after 0 are calculated 16 byte FEC verifications.
In the GPON system, when adopting FEC, uplink burst also needs many one decks FEC to handle, promptly also will be on uplink burst basis shown in Figure 2 according to RS (255,239) the FEC coding calculates and increase FEC verification, Fig. 3 is the schematic diagram according to the GPON uplink burst FEC cataloged procedure of correlation technique, the mode of increase FEC verification as shown in Figure 3, from the BIP territory, insert corresponding 16 byte FEC verifications after per 239 byte datas, last remainder also inserts 16 byte FEC verifications smaller or equal to 239 bytes thereafter.Therefore, Allocation interval behind the insertion FEC is than becoming big before, that is to say, StartTime among the allocated bandwidth figure and StopTime have considered the allocated bandwidth behind the FEC, correspondingly, when ONU carries out uplink burst formation uplink burst frame according to the upstream bandwidth that parses from BWmap, also to consider the influence of FEC, calculate the actual upstream bandwidth that uplink burst forms the uplink burst frame that can be used for.
When adopting FEC, because the influence of FEC has been considered in the distribution of upstream bandwidth, therefore GPON has strict requirement to the StartTime and the StopTime of allocated bandwidth, be that StartTime can not drop on the relevant zone of FEC verification with StopTime, Fig. 4 is the schematic diagram according to zero-time and the restriction of concluding time among the GPON allocated bandwidth figure of correlation technique, as shown in Figure 4, StartTime can not drop in the FEC verification, and StopTime can not drop on a byte before the FEC verification can not drop on preceding 15 bytes in the FEC verification.The strict demand of StartTime and StopTime has obviously been improved requirement to OLT DBA function.In addition, though there is strict demand in the GPON system to the StartTime and the StopTime of allocated bandwidth, do not provide corresponding fault-tolerant measure, promptly, if StartTime or StopTime are undesirable, the GPON relevant criterion is not indicated ONU, and how this handles.
In sum, when adopting FEC, after considering the influence of FEC to BWmap, the DBA function of OLT seems very complicated in the GPON system, and ONU also needs to recomputate the upstream bandwidth that can be used for the uplink burst frame according to FEC coded system and BWmap before sending uplink burst, but, in ONU, also have unsolved fault tolerant mechanism.
Because the XGPON system will be that standardization is carried out on the basis with the GPON system, therefore also there is the problem that exists in the GPON system in the XGPON system when adopting FEC.
After using the FEC verification in the correlation technique, DBA function among the OLT and the uplink burst among the ONU form the problem that uplink burst frame function complicates, and do not propose effective solution at present as yet.
Summary of the invention
After using the FEC verification, DBA function among the OLT and the uplink burst among the ONU form the problem that uplink burst frame function complicates and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of processing scheme of uplink forward error correction, one of to address the above problem at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of uplink forward error correction processing method.
Uplink forward error correction processing method according to the present invention is used for optical network unit increases the forward error correction verification according to the forward error correction coding mode for the uplink burst frame, said method comprises: optical network unit is provided with the uplink burst frame, wherein, optical network unit is concentrated setting to all the forward error correction verifications in the uplink burst frame.
Preferably, all the forward error correction verifications in the burst frame are concentrated to be provided with comprise: will be arranged in all forward error correction checksum sets after the data of all uplink burst frames; Maybe will be arranged in all forward error correction checksum sets before the data of all uplink burst frames.
Preferably, a plurality of forward error correction verifications in all forward error correction verifications are corresponding with a plurality of data in the uplink burst frame, and said method also comprises: concentrate putting in order of a plurality of forward error correction verifications be provided with in all forward error correction verifications according to a plurality of data putting in order in the uplink burst frame.
Preferably, before optical network unit is provided with the forward error correction verification, said method also comprises: optical network unit is according to parsing a plurality of continuous upstream bandwidths from the allocated bandwidth figure of optical line terminal, and the length of the relevant upstream bandwidth of each transmission container that obtains according to a plurality of continuous upstream bandwidths is assembled into the uplink burst frame; Optical network unit calculates the forward error correction verification of uplink burst frame according to the forward error correction coding mode.
Preferably, before optical network unit parses a plurality of continuous upstream bandwidths according to allocated bandwidth figure, said method also comprises: optical line terminal is that optical network unit distributes continuous upstream bandwidth, and reserves forward error correction verification bandwidth according to continuous upstream bandwidth; Optical line terminal is dressed up allocated bandwidth figure according to the continuous upstream bandwidth that distributes and the forward error correction verification sets of bandwidths of reservation, and allocated bandwidth figure is sent to optical network unit.
Preferably, carry indication information among the allocated bandwidth figure, wherein, indication information is used to indicate optical line terminal can handle the uplink burst frame of all forward error correction verifications being concentrated setting.
Preferably, after optical network unit was provided with the uplink burst frame, said method also comprised: optical network unit sends to optical line terminal with the uplink burst frame.
Preferably, said method also comprises: optical network unit is provided with sign in the uplink burst frame, and wherein, sign is used to indicate optical network unit whether setting to be concentrated in all forward error correction verifications.
Preferably, optical network unit is provided with sign in the up indication territory of uplink burst frame.
Preferably, after optical network unit sent to optical line terminal with the uplink burst frame, said method also comprised: optical line terminal receives the uplink burst frame, and according to sign the uplink burst frame is resolved.
Wherein, the uplink burst frame resolved comprise: optical line terminal interleaves the verification territory from bit to begin by the every piece of data that part obtains the uplink burst frame, obtain every part of forward error correction verification from the starting position of forward direction error checking and correction by part, every piece of data and corresponding forward error correction verification composition code word thereof are carried out the forward error correction verification.
To achieve these goals, according to a further aspect in the invention, provide a kind of optical network unit.
Optical network unit according to the present invention comprises: module is set, is used to be provided with the uplink burst frame, wherein, setting is concentrated in all the forward error correction verifications in the uplink burst frame.
Preferably, above-mentioned optical network unit also comprises: parsing module is used for parsing a plurality of continuous upstream bandwidths according to the allocated bandwidth figure from optical line terminal; Acquisition module is used for obtaining according to a plurality of continuous upstream bandwidth that parsing module parses the length of the relevant upstream bandwidth of each transmission container; Knockdown block is used for being assembled into the uplink burst frame according to the length that acquisition module obtains; Computing module is used for calculating according to the forward error correction coding mode forward error correction verification of uplink burst frame.
To achieve these goals, in accordance with a further aspect of the present invention, provide a kind of optical line terminal.
Optical line terminal according to the present invention comprises: distribution module is used to optical network unit to distribute continuous upstream bandwidth; Configuration module is used for reserving forward error correction verification bandwidth according to the continuous upstream bandwidth of module assigns; Knockdown block is used for dressing up allocated bandwidth figure according to the forward error correction verification sets of bandwidths that the continuous upstream bandwidth and the configuration module of module assigns are reserved; Sending module is used for allocated bandwidth figure is sent to optical network unit.
By the present invention, when having adopted ONU to be uplink burst increase FEC verification, setting is concentrated in verification to FEC, make and be inserted in the middle of the uplink burst frame between FEC verification no longer, after having solved use FEC verification, the problem that DBA function among the OLT and the uplink burst frame function among the ONU complicate, and then simplified the DBA function of OLT and the function that the uplink burst among the ONU forms the uplink burst frame.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the GPON allocated bandwidth of correlation technique;
Fig. 2 is the schematic diagram according to the GPON uplink burst frame structure of correlation technique;
Fig. 3 is the schematic diagram according to the GPON uplink burst FEC cataloged procedure of correlation technique;
Fig. 4 is the schematic diagram according to zero-time and the restriction of concluding time among the GPON allocated bandwidth figure of correlation technique;
Fig. 5 is the schematic diagram according to the GPON uplink burst FEC cataloged procedure after the improvement of the embodiment of the invention;
Fig. 6 is the concrete structure block diagram according to the ONU of the embodiment of the invention;
Fig. 7 is the structured flowchart according to the OLT of the embodiment of the invention.
Embodiment
Functional overview
Consider in the correlation technique use the FEC verification after, DBA function among the OLT and the uplink burst among the ONU form the problem that uplink burst frame function complicates, the embodiment of the invention provides a kind of processing scheme of improved uplink forward error correction, be used for ONU and increase the FEC verification for the uplink burst frame according to the FEC coded system, wherein, ONU concentrates setting to all the FEC verifications in the uplink burst frame, that is, ONU can will be arranged on before the data of all uplink burst frames or afterwards in all FEC checksum sets.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, a kind of uplink forward error correction processing method is provided, and being used for ONU increases the FEC verification according to the FEC coded system for the uplink burst frame, and this method comprises: ONU is provided with the uplink burst frame, wherein, ONU concentrates setting to all the FEC verifications in the uplink burst frame.Promptly, ONU can will be arranged in all FEC checksum sets after the data of all uplink burst frames, also can will (for example be arranged in all FEC checksum sets before the data of all uplink burst frames, can be arranged on before the BIP), wherein, a plurality of FEC verifications in all FEC verifications are corresponding with a plurality of data in the uplink burst frame, and concentrate putting in order of a plurality of FEC verifications be provided with in all verifications according to a plurality of data putting in order in the uplink burst frame, then, ONU sends to OLT with this uplink burst frame.
Need to prove, ONU can by in this uplink burst frame, be provided with sign indicate ONU be be arranged in all FEC checksum sets after the data of all uplink burst frames or before.
Specifically, ONU is a uplink burst when increasing the FEC verification, calculates the FEC verification according to the FEC coded system, and each FEC verification is placed on after the uplink burst frame in order (also can be placed on before the uplink burst frame), that is, be inserted in the middle of the uplink burst frame between FEC verification no longer.Be that example describes afterwards each FEC verification is placed in order the uplink burst frame below.Fig. 5 is according to the GPON uplink burst FEC cataloged procedure schematic diagram after the improvement of the embodiment of the invention, as shown in Figure 5, according to RS (255,239) FEC coding method, begin to obtain first part of 239 byte data from the BIP territory, calculate the FEC verification of 16 bytes, this FEC verification is placed on follows closely after the uplink burst, obtain second part of 239 byte data then, calculate the FEC verification of 16 bytes, this FEC verification is placed on follows closely after the previous FEC verification, the rest may be inferred, up to last piece of data being calculated 16 byte FEC verifications and this FEC verification being placed at last.
Before ONU is provided with the FEC verification, ONU is according to the upstream bandwidth that parses plurality of continuous from the allocated bandwidth figure of OLT, and the length of the relevant upstream bandwidth of the T-CONT that obtains according to a plurality of continuous upstream bandwidths is assembled into the uplink burst frame, then, the FEC verification that ONU calculates the uplink burst frame according to the FEC coded system, and each FEC verification is placed in order follows closely after the uplink burst frame.Therefore, ONU not influence of needs consideration FEC carry out uplink burst formation uplink burst frame according to allocated bandwidth figure before.
Because ONU is placed on the FEC verification after the uplink burst frame in order, the DBA function among the OLT is that ONU distributes continuous upstream bandwidth, and reserves FEC verification bandwidth according to continuous upstream bandwidth.Particularly, DBA function among the OLT is after ONU distributes the upstream bandwidth of plurality of continuous, also to calculate total size of FEC verification according to the FEC coded system, and after these continuous upstream bandwidths, reserve the corresponding size of FEC verification bandwidth (as long as the plurality of continuous upstream bandwidth that distributes for ONU definite after, total size of the FEC verification that corresponding uplink burst is relevant has also just been determined, the function relevant with FEC is the total size that obtains the FEC verification in the DBA function, the function that the FEC that will consider with the DBA of GPON system in the prior art is relevant is compared, the processing method that the embodiment of the invention provides is simpler, wherein, calculating the function of the total size of FEC verification is not necessarily finished by the DBA function, also can calculate total size of FEC verification and the DBA function obtains total size of FEC verification by other functions), just as be all Guard Time, Preamble, Delimiter, BIP, ONU-ID, it is the same that Ind reserves respective bandwidth.The bandwidth of reserving for the FEC verification is not used further to the upstream bandwidth distribution.The allocated bandwidth result of DBA function output is used to assemble allocated bandwidth figure, and then, OLT dresses up allocated bandwidth figure according to the continuous upstream bandwidth that distributes and the FEC verification sets of bandwidths of reservation, and allocated bandwidth figure is sent to ONU.The time started of allocated bandwidth and concluding time are the results behind the consideration FEC among the allocated bandwidth figure, and therefore, the bandwidth length of each T-CONT is irrelevant with FEC.
Consider and the compatibility of GPON system that OLT can indicate this OLT can support the up FEC processing method of the embodiment of the invention at down direction.That is, carry indication information in allocated bandwidth figure, this indication information is used to indicate OLT can handle the uplink burst frame of all FEC verifications being concentrated setting.For example, can use the bit 6 of the Flags (flag bit) in the upstream bandwidth structure in the upstream bandwidth distribution diagram to represent whether this OLT supports the up FEC processing method in the present embodiment, and this bit is, expresses support at 1 o'clock, be to represent not support in 0 o'clock.
ONU also can indicate this ONU to adopt the FEC processing method of the embodiment of the invention in the uplink burst frame, promptly, ONU is provided with sign in the uplink burst frame, this sign is used for pointing out this ONU of OLT whether the FEC verification (for example to be concentrated setting in order at the uplink burst frame, be placed on after the data), for example, this sign can be arranged in the Ind territory, ONU uses the bit 0 in the Ind territory, and this bit 0 is to represent that ONU had adopted the FEC processing method of the embodiment of the invention at 1 o'clock.
Receive the uplink burst frame of ONU transmission at OLT after, the uplink burst frame is resolved according to above-mentioned sign.That is, OLT begins from the BIP territory to pursue part from the starting position of FEC verification and obtain every part of FEC verification by the every piece of data part acquisition uplink burst frame, and every piece of data and corresponding FEC verification composition code word thereof are carried out the FEC verification.
By present embodiment, a kind of simple and effective up FEC processing method is provided, reduced of the influence of FEC function to DBA function, uplink burst formation uplink burst frame function.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Embodiment one
This embodiment describes is that up FEC in the GPON system handles.The relevant treatment of present embodiment when not adopting FEC is identical with GPON standard in the correlation technique, does not repeat them here.
Present embodiment adopts RS (255,239) the FEC coded system in the GPON system.
When adopting FEC, the processing of up FEC correlation function is presented as in the GPON system:
(1) DBA function.
(1.1) the DBA function is distributed the upstream bandwidth of plurality of continuous (at least one) for each need distribute the ONU of upstream bandwidth.
(1.2) the DBA function is calculated the amount of bandwidth of reserving the FEC verification at the plurality of continuous upstream bandwidth of distributing to specific ONU.Concrete computational methods are: the total size that is assumed to be the continuous upstream bandwidth of specific ONU distribution is the N byte, because being the BIP territory from the uplink burst frame, the FEC verification begins to calculate, therefore after considering BIP (1 byte), ONU-ID (1 byte), Ind (1 byte), for the total size of the data of FEC verification is the N+3 byte, and the amount of bandwidth computational methods of reserving for the FEC check are expression formula 1, expression formula 2 (unit is a byte) so:
When (N+3) is 239 integral multiple, use expression formula 1:((N+3)/239) * 16;
When (N+3) is not 239 integral multiple, use expression formula 2:(INT ((N+3)/239)+1) * 16, wherein INT is a bracket function,, directly gets the integer part of expression formula numerical value in the INT bracket that is.
(1.3) after the DBA function distributed the upstream bandwidth of one-period (125 microsecond), with allocated bandwidth result output, OLT assembled allocated bandwidth figure BWmap and sends to ONU according to this allocated bandwidth result.
(2) the ONU uplink burst forms the uplink burst frame and sends the uplink burst frame.
(2.1) after ONU receives the allocated bandwidth figure BWmap of OLT transmission, parse the continuous upstream bandwidth relevant with this ONU, obtain the time started (being expressed as T1) of first upstream bandwidth, then, obtain the length of each upstream bandwidth, and carry out uplink burst according to each upstream bandwidth length and form the uplink burst frame, increase BIP, ONU-ID and Ind territory simultaneously.For the FEC processing method that ONU is adopted the embodiment of the invention is notified to OLT, ONU uses the bit 0 in Ind territory, and promptly Ind territory bit 0 is to represent that ONU had adopted the FEC processing method of the embodiment of the invention at 1 o'clock.
(2.2) after the ONU uplink burst forms uplink frame,, calculate the FEC verification of 16 bytes and in order the FEC verification of each 16 byte is placed on after the uplink burst according to per 239 bytes from the BIP territory.
(2.3) after the FEC coding is finished, increase Preamble, Delimiter territory, carry out scrambler according to the GPON standard, calculate the transmitting time of this uplink burst frame according to the T1 in (2.1) and in conjunction with Preamble, the Delimiter, BIP, ONU-ID, the Ind territory that increase, send the uplink burst frame in this time then.
(3) OLT receives and resolves the uplink burst frame.
When (3.1) OLT receives the uplink burst frame of ONU transmission, at first check the bit 0 in Ind territory, if this bit is 1, thinks that then ONU adopts the up FEC processing method of the embodiment of the invention, and resolve uplink burst according to the up FEC processing method of the embodiment of the invention.
(3.2) OLT obtains total size of the relevant continuous upstream bandwidth of this uplink burst according to the allocated bandwidth figure BWmap of this locality preservation, and obtains the starting position of FEC verification.
(3.3) OLT begins to obtain one by one every part 239 byte data from the BIP territory, obtain the FEC verification of every part 16 byte one by one from the starting position of FEC verification, the code word of in order the FEC verification of the data of corresponding 239 bytes and 16 bytes being formed one 255 byte is carried out FEC and is checked and error correction.
By this embodiment, up FEC is handled become simple.
Embodiment two
This embodiment describes is that up FEC in the XGPON system handles.For the identical part of this embodiment and embodiment one, do not repeat them here, the different part of this embodiment and embodiment one below will mainly be described.
The FEC coded system of XGPON system may change, but still adopts Reed-Solomon FEC coded system, is assumed to be RS (P, Q), wherein, P not necessarily 255, Q not necessarily 239, and its FEC coded system is: the FEC verification of (P-Q) byte is calculated and increased to every Q byte data.
Calculating FEC verification bandwidth reserved among the embodiment one (1.2) will rethink.But ONU-ID may expand to 2 bytes be also not last definite in the XGPON system, hypothesis participates in BIP, the ONU-ID of FEC verification so, total size in Ind territory is M, the total length of upstream bandwidth still is N continuously, if ONU-ID becomes 2 bytes, then calculate the amount of bandwidth of reserving the FEC check among the embodiment one (1.2) and become (INT ((N+4)/239)+1) * 16.The amount of bandwidth computational methods of reserving for the FEC check in the XGPON system are expression formula 3, expression formula 4:
When (N+M) is the integral multiple of Q, use expression formula 3:((N+M)/Q) * (P-Q);
When (N+M) is not the integral multiple of Q, use expression formula 4:(INT ((N+M)/Q)+1) * (P-Q).
(3.3) OLT begins to obtain one by one every part of Q byte data from the BIP territory, obtain the FEC verification of every part of (P-Q) byte one by one from the starting position of FEC verification, in order with the data of corresponding Q byte and (P-Q) the FEC verification of the byte code word of forming a P byte carry out FEC and check and error correction.
The Ind territory of XGPON system may redefine, and may use other bit indication FEC processing mode in Ind territory, but this can not influence the step that FEC handles.
By this embodiment, simplified up FEC processing in the XGPON system.
Device embodiment one
According to embodiments of the invention, provide a kind of ONU.This ONU comprises: module 62 is set, is used to be provided with the uplink burst frame, wherein, setting is concentrated in all the FEC verifications in the uplink burst frame.Promptly, can will be arranged in all FEC checksum sets after the data of all uplink burst frames, also can will (for example be arranged in all FEC checksum sets before the data of all uplink burst frames, can be arranged on before the BIP), wherein, a plurality of FEC verifications in all FEC verifications are corresponding with a plurality of data in the uplink burst frame, and concentrate putting in order of a plurality of FEC verifications be provided with in all verifications according to a plurality of data putting in order in the uplink burst frame.
Fig. 6 is the concrete structure block diagram according to the ONU of the embodiment of the invention, and as shown in Figure 6, above-mentioned ONU also comprises parsing module 64, acquisition module 66, Knockdown block 68, computing module 60, below said structure is described.
Parsing module 64 is used for parsing a plurality of continuous upstream bandwidths according to the allocated bandwidth figure from OLT; Acquisition module 66 is connected to parsing module 64, is used for obtaining according to a plurality of continuous upstream bandwidth that parsing module 64 parses the length of the relevant upstream bandwidth of each transmission container; Knockdown block 68 is connected to acquisition module 66, is used for being assembled into the uplink burst frame according to the length that acquisition module 66 obtains; Computing module 60 is connected to Knockdown block 68, is used for calculating according to the FEC coded system FEC verification of uplink burst frame.Module 62 is set is connected to computing module 60.After computing module 60 calculates the FEC verification of uplink burst frame, the setting operation that carries out the FEC verification.
Wherein, ONU can be provided with sign in the uplink burst frame, be used for pointing out this ONU of OLT the FEC verification (for example to be concentrated setting in order at uplink burst, be placed on after the data or data before), this sign can be arranged in the Ind territory, for example, can use the bit 0 in the Ind territory, that is, when being 1, bit 0 represents that ONU has adopted the FEC processing method of the embodiment of the invention.
By this device embodiment, realized the setting that the FEC with the uplink burst frame concentrates, make ONU send uplink burst and needn't consider the influence of FEC, thereby the processing of FEC is become simple bandwidth length according to allocated bandwidth figure.
Device embodiment two
According to embodiments of the invention, provide a kind of OLT.Fig. 7 is the structured flowchart according to the OLT of the embodiment of the invention, and as shown in Figure 7, this OLT comprises distribution module 72, configuration module 74, Knockdown block 76, sending module 78, below said structure is described.
Distribution module 72 is used to ONU to distribute continuous upstream bandwidth; Configuration module 74 is connected to distribution module 72, is used for reserving forward error correction verification bandwidth according to the continuous upstream bandwidth that distribution module 72 is distributed; Knockdown block 76 is connected to configuration module 74 and distribution module 72, is used for dressing up allocated bandwidth figure according to the forward error correction verification sets of bandwidths that the continuous upstream bandwidth and the configuration module 74 of distribution module 72 distribution are reserved; Sending module 78 is connected to Knockdown block 76, is used for allocated bandwidth figure is sent to ONU.
Wherein, OLT can carry the indication information of the up FEC processing method that is used to indicate this OLT can support the embodiment of the invention (that is, can handle the uplink burst frame that is provided with is concentrated in all FEC verifications) at down direction.For example, can use the bit 6 of the Flags (flag bit) in the upstream bandwidth structure in the upstream bandwidth distribution diagram to represent whether this OLT supports the up FEC processing method in the present embodiment, when this bit is 1, expresses support for, be to represent not support in 0 o'clock.
Receive the uplink burst frame that ONU sends at OLT, the uplink burst frame is resolved according to the sign in the uplink burst frame.Promptly, OLT interleaves the verification territory from bit to begin by the every piece of data part acquisition uplink burst frame, obtain every part of forward error correction verification from the starting position of forward direction error checking and correction by part, every piece of data and corresponding forward error correction verification composition code word thereof are carried out the forward error correction verification.
By this device embodiment, make that the DBA function among the OLT becomes simple.
In sum, pass through the above embodiment of the present invention, make that the function relevant with FEC becomes simple in the DBA function among the OLT, and ONU according to allocated bandwidth figure send the uplink burst frame also not needs consider the influence of FEC to bandwidth length, make the FEC processing in the GPON/XGPON system become simple, and the characteristic of having reused GPON/XGPON to greatest extent.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a uplink forward error correction processing method is used for optical network unit and is uplink burst frame increase forward error correction verification according to the forward error correction coding mode, it is characterized in that described method comprises:
Described optical network unit is provided with described uplink burst frame, and wherein, described optical network unit is concentrated setting to all the forward error correction verifications in the described uplink burst frame.
2. method according to claim 1 is characterized in that, all the forward error correction verifications in the described burst frame is concentrated to be provided with comprise:
To be arranged in described all forward error correction checksum sets after the data of all described uplink burst frames; Or
To be arranged in described all forward error correction checksum sets before the data of all described uplink burst frames.
3. method according to claim 1 and 2 is characterized in that, a plurality of forward error correction verifications in described all forward error correction verifications are corresponding with a plurality of data in the described uplink burst frame, and described method also comprises:
Concentrate putting in order of the described a plurality of forward error correction verifications be provided with in described all forward error correction verifications according to described a plurality of data putting in order in described uplink burst frame.
4. method according to claim 1 and 2 is characterized in that, before described optical network unit was provided with described forward error correction verification, described method also comprised:
Described optical network unit parses a plurality of continuous upstream bandwidths according to the allocated bandwidth figure from optical line terminal, and the length of the relevant upstream bandwidth of each transmission container that obtains according to described a plurality of continuous upstream bandwidths is assembled into described uplink burst frame;
Described optical network unit calculates the described forward error correction verification of described uplink burst frame according to described forward error correction coding mode.
5. method according to claim 4 is characterized in that, described optical network unit parsed described a plurality of continuous upstream bandwidth according to described allocated bandwidth figure before, described method also comprised:
Described optical line terminal is that described optical network unit distributes described continuous upstream bandwidth, and reserves forward error correction verification bandwidth according to described continuous upstream bandwidth;
Described optical line terminal is dressed up described allocated bandwidth figure according to the described continuous upstream bandwidth that distributes and the described forward error correction verification sets of bandwidths of reservation, and described allocated bandwidth figure is sent to described optical network unit.
6. method according to claim 5, it is characterized in that, carry indication information among the described allocated bandwidth figure, wherein, described indication information is used to indicate described optical line terminal can handle the uplink burst frame of all forward error correction verifications being concentrated setting.
7. method according to claim 1 is characterized in that, after described optical network unit was provided with described uplink burst frame, described method also comprised:
Described optical network unit sends to described optical line terminal with described uplink burst frame.
8. method according to claim 7 is characterized in that, described method also comprises:
Described optical network unit is provided with sign in described uplink burst frame, wherein, described sign is used to indicate described optical network unit whether setting to be concentrated in all described forward error correction verifications.
9. method according to claim 8 is characterized in that, described optical network unit is provided with described sign in the up indication territory of described uplink burst frame.
10. according to Claim 8 or 9 described methods, it is characterized in that after described optical network unit sent to described optical line terminal with described uplink burst frame, described method also comprised:
Described optical line terminal receives described uplink burst frame, and according to described sign described uplink burst frame is resolved.
11. method according to claim 10 is characterized in that, the described uplink burst frame is resolved comprises:
Described optical line terminal interleaves the verification territory from bit to begin by the every piece of data part described uplink burst frame of acquisition, obtain every part of forward error correction verification from the starting position of described forward error correction verification by part, described every piece of data and corresponding forward error correction verification composition code word thereof are carried out the forward error correction verification.
12. an optical network unit is characterized in that, comprising:
Module is set, is used to be provided with the uplink burst frame, wherein, setting is concentrated in all the forward error correction verifications in the described uplink burst frame.
13. optical network unit according to claim 12 is characterized in that, also comprises:
Parsing module is used for parsing a plurality of continuous upstream bandwidths according to the allocated bandwidth figure from optical line terminal;
Acquisition module is used for obtaining according to described a plurality of continuous upstream bandwidths that described parsing module parses the length of the relevant upstream bandwidth of each transmission container;
Knockdown block is used for being assembled into described uplink burst frame according to the described length that described acquisition module obtains;
Computing module is used for calculating according to the forward error correction coding mode the described forward error correction verification of described uplink burst frame.
14. an optical line terminal is characterized in that, comprising:
Distribution module is used to optical network unit to distribute continuous upstream bandwidth;
Configuration module is used for reserving forward error correction verification bandwidth according to the described continuous upstream bandwidth of described module assigns;
Knockdown block is used for dressing up described allocated bandwidth figure according to the described forward error correction verification sets of bandwidths that the described continuous upstream bandwidth and the described configuration module of described module assigns are reserved;
Sending module is used for described allocated bandwidth figure is sent to optical network unit.
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