CN1728640A - Quick responsive method and system for assigning dynamic bandwidch - Google Patents
Quick responsive method and system for assigning dynamic bandwidch Download PDFInfo
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- CN1728640A CN1728640A CN200410053138.4A CN200410053138A CN1728640A CN 1728640 A CN1728640 A CN 1728640A CN 200410053138 A CN200410053138 A CN 200410053138A CN 1728640 A CN1728640 A CN 1728640A
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Abstract
The passive optical network includes optical line terminal (OLT) and multiple optical network units (ONU). Through tree form optical distribution network from one point to multiple points, OLT communicates to multiple ONU: broadcasting mode is adopted for down going transmission, and time-division multiplexing mode is adopted for up going transmission. ONU sends message of report to OLT. After receiving message of report, OLT processes the message instantly, and sends corresponding gating message to ONU instantly. ONU includes buffer device in use for buffering operation data, collection device in use for obtaining message of report from buffering device, and transmission device in use for transmitting operation data and message of report. OLT includes a receiving and processing device in use for processing received message of report, a transmission device in use for transmitting corresponding gating message instantly after having processed message of report.
Description
Technical field
The present invention relates to a kind of EPON, relate in particular to the distribution method of dynamic bandwidth, system and the device that respond fast in a kind of EPON.
Background technology
Passive optical access network (PON) is that a kind of Passive Optical Components such as optical fiber and light separator that utilize constitute the technical scheme that light substep network carries out broadband access.It is normally by optical line terminal (OLT), and optical network unit (ONU) and light substep network (ODN) constitute.Fig. 1 has shown a typical passive optical access network.It comprises OLT11, and splitter 12 a bit to the tree-like light distributed network 13 of multiple spot and N ONU, is respectively ONU141, ONU142...ONU14N.Wherein, OLT communicates by any tree-like ODN13 and a plurality of ONU to multiple spot.On communication mode, descending employing be broadcast mode, ONU receives one's own packet according to the sign of packet.Yet, up employing time division multiplexing (TDMA) mode shared bandwidth, ONU can only transmit information to OLT in distributing to the time slot of oneself, and other times can only be waited for.The uplink time slot of ONU is distributed by OLT, and OLT notifies it when can begin transmit ascending data and how long transmit by send gating message to ONU.Like this, OLT just can realize the allocated bandwidth of up link between each ONU.This shows that PON is a kind of based on some network structure system to multiple spot, all ONU share transmission bandwidth by the scheduling of OLT.Existing P ON technology comprises the APON/BPON based on ATM(Asynchronous Transfer Mode), based on the EPON of Ethernet and the GPON with gigabit (Gigabit) speed.
Because PON goes up the data carried by data business and often has suddenly, if distribute a fixing bandwidth just for simply each ONU, may produce following situation: the data volume that arrives among some ONU seldom, the bandwidth major part of distributing to it is not utilized; Yet the data volume that arrives among the other ONU is very big, distributes to its bandwidth and can't satisfy the demand at all.In addition, same ONU might not arrive data substantially in a certain period yet, does not therefore have data to transmit in distributing to its time slot; And another period has mass data to arrive.Above-mentioned situation all can cause huge waste to the upstream bandwidth of PON system preciousness.Therefore, in order to effectively utilize bandwidth, the PON system often adopts Dynamic Bandwidth Allocation (DBA) strategy on up direction, and promptly OLT dynamically adjusts the upstream bandwidth of distributing to ONU according to the practical business state of ONU.
Existing Dynamic Bandwidth Allocation mechanism generally is divided into upstream bandwidth (uplink time) the isometric or not isometric cycle.All the period of certain in the cycle reports to OLT to its quene state to all ONU; OLT concentrates after the state information of collecting whole all ONU and handles, thereby determines transmission time started and the concluding time of each ONU of following one-period.OLT is by the descending relevant information of gating message informing ONU then.Because OLT handles and needs the regular hour, ONU normally just carries out the report of service condition when the cycle begins, can arrive ONU before following one-period begins to guarantee the gating message that OLT returns.For the convenience that illustrates, below OLT is distributed to ONU one section changeable continuous up transmitting time be referred to as one " time slot ".
Though said method can be realized Dynamic Bandwidth Allocation preferably, OLT need concentrate and carry out bandwidth allocation process after the report message of collecting all ONU, sends gating message then.In this case, in order to support constant bit rate service, OLT is necessary for each ONU and distributes a dedicated time slot that is independent of data to send report message.Because OLT only uses an optical receiver to receive the signal that each ONU sends, synchronous as early as possible with the data of receiving in order to make OLT, ONU must send one section pilot signal at each when independently sending time slots begins.In addition, two the protection bandwidth that independently should insert certain intervals between the ascending time slot usually.Like this, the special use that is independent of data reports that the introducing of time slot has just reduced the bandwidth availability ratio of system.In addition, above-mentioned conventional method is when supporting that fixed bit rate (CBR) is professional, and OLT generally is divided into the isometric cycle with the uplink time.But because data packets for transmission can be not isometric (all requiring the PON system to support the transmission of the Ethernet data bag of variable-length in EPON and GPON agreement) in the PON system, this must cause in each cycle all that some upstream bandwidth can't distribute, and reason is the packet that they can't hold a certain length-specific.
In addition, the fairness problem that unpromising each ONU of conventional method participates in allocated bandwidth provides solution, has just given OLT all Decision of Allocation power.
Summary of the invention
At the shortcoming that exists in the above-mentioned prior art, technical problem to be solved by this invention provides a kind of distribution method of dynamic bandwidth, system and device that responds fast in EPON, thereby when supporting certain quality of service, improve the bandwidth availability ratio of network, and reduce requirement equipment.
In order to address the above problem, according to the present invention, the distribution method of dynamic bandwidth that responds fast in a kind of EPON is provided, described EPON comprises optical line terminal and a plurality of optical network unit, described optical line terminal communicates by any tree-like light distributed network and described a plurality of optical network unit to multiple spot, descending employing broadcast mode, up employing time division multiplexing mode, described method comprise the steps: that described optical network unit sends report message to described optical line terminal; After receiving described report message, described optical line terminal is handled it immediately, and sends corresponding gating message to described optical network unit immediately.
The present invention also provides the Dynamic Bandwidth Allocation system that responds fast in a kind of EPON, described EPON comprises optical line terminal and a plurality of optical network unit, described optical line terminal communicates by any tree-like light distributed network and described a plurality of optical network unit to multiple spot, descending employing broadcast mode, up employing time division multiplexing mode, described optical network unit sends report message to described optical line terminal; After receiving described report message, described optical line terminal is handled it immediately, and sends corresponding gating message to described optical network unit immediately.
The present invention also provides the optical network unit in a kind of EPON, and it comprises: buffer storage is used for the buffer memory business datum; Deriving means is used for obtaining report message from buffer storage; Dispensing device, the report message that is used to send business datum and comes from deriving means from buffer storage.
The present invention also provides the optical line terminal of planting in the EPON, and it comprises: receiving and processing device is used at once it being handled after receiving report message; Dispensing device is used for after described receiving and processing device is handled described report message, sends corresponding gating message immediately.
Preferably, described report message and business datum send in same time slot.
Preferably, the length of described report message is fixed, and comprises two state informations: minimum quene state and maximum queue state, these two state informations are the length states that comprise complete data packet.
Preferably, described optical line terminal is minimum bandwidth that guarantees of each optical network unit regulation.
Preferably, described minimum for each optical network unit regulation guarantees that bandwidth satisfies following condition:
NG+(1～3)×(L-G)≤B
Wherein N is the number of optical network unit, and G to be optical line terminal the be average minimum bandwidth that guarantees of each optical network unit regulation, the desired average bandwidth of business datum that L arrives in two cycles for all optical network units, B is interior total bandwidth of uploading of cycle.
Preferably, described minimum guarantees that bandwidth sends to optical network unit by the down management link.
Preferably, the desired bandwidth sum of minimum quene state and report message is less than or equal to the minimum bandwidth that guarantees.
Preferably, described gating message comprises that maximum requires bandwidth or minimum to require bandwidth value, and wherein, it is the desired bandwidth sum of maximum queue state and report message that maximum requires bandwidth; It is the desired bandwidth sum of minimum quene state and report message that minimum requires bandwidth.
Preferably, optical line terminal satisfies the requirement with the report message that arrives earlier in one-period earlier, when the maximum corresponding with this message requires bandwidth and the bandwidth of having reserved for the optical network unit that has sent report message and the minimum reserved for the optical network unit that does not send report message as yet when guaranteeing the bandwidth sum less than the total bandwidth in the one-period, optical line terminal comprises that for the optical network unit that sends this report message sends maximum requires the gating message of bandwidth value, otherwise transmission comprises that minimum requires the gating message of bandwidth value.
Preferably, optical line terminal is a cyclic shift to the processing sequence of the report message of optical network unit.
Preferably, the time-multiplexed cycle is not fixed, and changes near the periodic quantity of certain standard.
Preferably, the length of described buffer storage is 3 times of average length of the business datum that arrives in two cycles at least.
After adopting the present invention, can obtain following beneficial effect: improved the bandwidth availability ratio of network, improved the transmission performance of system; The quick bandwidth allocation methods that the present invention adopts is very simple, helps hardware and realizes; Instant allocated bandwidth strategy makes optical network unit have the sufficient time to carry out the assembling of upstream, has reduced the requirement of ONU to processing speed, has saved cost; Can on the basis that guarantees certain bandwidth, be implemented in allocated bandwidth fair between each ONU, and make each ONU have certain quality of service assurance.
Description of drawings
Fig. 1 has shown a typical passive optical access network;
Fig. 2 has shown the schematic symbol diagram of " preferential in order " bandwidth allocation methods;
Fig. 3 has shown the schematic diagram of " paracycle ";
Fig. 4 has shown the schematic diagram of " cyclic shift ";
Fig. 5 has shown the schematic diagram of optical network unit;
Fig. 6 has shown the schematic diagram of optical line terminal.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
As previously described, Fig. 1 has shown a typical passive optical access network.It comprises OLT11, and splitter 12 a bit to the tree-like light distributed network 13 of multiple spot and N ONU, is respectively ONU141, ONU142...ONU14N.Wherein, OLT communicates by any tree-like ODN13 and a plurality of ONU to multiple spot.On communication mode, descending employing be broadcast mode, ONU receives one's own packet according to the sign of packet.Up employing time division multiplexing (TDMA) mode shared bandwidth, ONU can only transmit information to OLT in distributing to the time slot of oneself, and other times can only be waited for.
In an embodiment of the invention, OLT handles immediately to the report message that arrives, and gating message is tackled in transmission mutually immediately, rather than in the picture prior art, OLT is after the report message of collecting all ONU, concentrates and carries out bandwidth allocation process, sends gating message then.Under extreme case, this situation can appear, and the transmission bandwidth that certain ONU report message requires is very big, thereby causes other the ONU of following one-period can't service data transmission.In order to make each ONU can both provide certain Quality of Service to guarantee, in an embodiment of the invention, OLT is minimum assurance bandwidth of each ONU regulation, and by the down management link this minimum is guaranteed that bandwidth is notified to ONU.Like this, OLT and corresponding ONU know that this minimum guarantees bandwidth.This minimum guarantees that bandwidth can according to circumstances change, and under extreme case, also can be zero.Therefore, even OLT does not receive the report message of ONU, total it still know in the specific period should for each ONU reserve the assurance bandwidth.
In an embodiment of the invention, the report message of each ONU is a fixed length, and comprises two information: desired bandwidth of minimum quene state and the desired bandwidth of maximum queue state, use S respectively
MinAnd S
MaxExpression.
In an embodiment of the invention, report message follows closely after business datum and is sent out, and does not need to provide independently sending time slots for it.Therefore, OLT also must consider the bandwidth that report message itself requires and protect bandwidth except the bandwidth that will consider business datum and need.In the following description, for easy, will protect bandwidth to count report message.At this moment, S
MinRefer to the desired bandwidth of quene state, it less than or equal minimum just and guarantee that bandwidth deducts the value after the report message bandwidth, S
MaxRefer to the desired bandwidth of current queue state.Work as S
MaxWhen guaranteeing bandwidth less than minimum, S
Min=S
Max
Because the seizure condition of formation changes along with arriving length of data package, and the length of data package that arrives is not fixed, but change.In order to simplify the PON system, make it not need to possess complicated upper strata assembling function, and can make full use of bandwidth, in an embodiment of the invention, the desired bandwidth information of quene state of ONU report must make its complete packet that can send some, and therefore above-mentioned two information all must be to comprise the desired bandwidth information of complete data packet.
In an embodiment of the invention, the Fast Dynamic bandwidth allocation is as follows:
(1) OLT is only for each ONU distributes a transmitting uplink data time slot in one-period, and the length of this time slot is corresponding with ONU quene state of selecting for use and the desired bandwidth sum of report message;
(2) ONU is uploaded to OLT together with report message and data in the OLT distributed time slot, and report message follows closely after business datum and is sent out, and does not need to provide independently sending time slots for it;
(3) OLT handles the report time slot that arrives immediately, and sends corresponding gating message immediately and tell this ONU the uplink time slot of following one-period;
(4) data upload of ONU basis format next round wherein after receiving gating message.
In an embodiment of the invention, OLT adopts " preferential in order " strategy to come mabage report message.That is, under possible situation, OLT satisfies the requirement with the report message that arrives earlier in one-period as far as possible, but OLT is necessary for the minimum assurance bandwidth that other ONU stay promise in advance.In addition, OLT has used maximum to require bandwidth and minimum to require these two values of bandwidth in bandwidth calculation.Wherein maximum maximum queue state and the desired bandwidth sum of report message that requires bandwidth to equal the ONU report; Minimum requires bandwidth to be meant the minimum quene state and the desired bandwidth sum of report message of ONU report.
Fig. 2 has shown the schematic symbol diagram of " preferential in order " bandwidth allocation methods.As shown in the figure, if total bandwidth of uploading is P in the one-period, the quantity of ONU is N, and OLT makes a promise to be respectively G to the bandwidth that guarantees of each ONU
1, G
2... G
N, and the bandwidth that each ONU distributes is used V respectively
1, V
2, V
3... V
I-1Expression.If it is Max that the maximum that obtains this ONU by the queuing message of i ONU report requires bandwidth
i, it is Min that minimum requires bandwidth
i, then the method for " preferential in order " is distributed to ONU
iBandwidth V
iCan be represented by the formula:
In a preferred embodiment of the present invention, for the needs of fast processing, preserve respectively with two variablees
With
Value, and assigned at every turn the back they are made amendment.In this execution mode, need carry out 5 sub-additions each only the distribution, 1 subtraction and 1 judgement.Wherein, ask maximum to require bandwidth and minimum to require bandwidth each sub-addition respectively, two sub-additions of suing for peace are revised
With
Value use a sub-addition and a subtraction respectively.In addition, in yet another embodiment of the present invention, for need not be right when each cycle begins
Add up, adopt a specific variable to preserve this accumulated value.
The definition that minimum is required bandwidth by the front as can be known, total minimum guarantees that bandwidth always requires bandwidth more than or equal to total minimum.So OLT is that the bandwidth that follow-up ONU reserves can not be fully utilized.Similarly, the problem that yet exists bandwidth not to be fully utilized in other bandwidth allocation methods does not just have picture so serious in the method for described " preferential in order " in front.Therefore, in an embodiment of the invention, adopted " paracycle ".Its meaning is that the length in cycle no longer immobilizes, but dynamic change, promptly according to the allocated bandwidth situation of reality remaining bandwidth counted following one-period and distributes.Why can realize that this execution mode is all is in order to realize that this ONU is in the uplink of following one-period, so OLT can make adjustment to Cycle Length at any time because OLT deals with behind the report message of this cycle of receiving ONU.Like this, Shi Ji Cycle Length is to change near the length a normal period.Preferably, in order better to support the traditional voice service of 8KHZ sampling, the length of normal period is 125 μ s.Certainly, the present invention is not limited thereto, and the length of normal period can be other value.In same " paracycle ", all ONU respectively finish data upload one time in the PON system.Simultaneously, OLT is followed successively by the bandwidth of uploading that each ONU distributes next " paracycle " by the sequencing that report message arrives.
Fig. 3 has shown the schematic diagram of " paracycle ".As shown in the figure, if the bandwidth that can distribute in the normal period of system is P=P
0, the remaining bandwidth that OLT finishes i cycle after the distribution of last ONU is a Δ
iIn following one-period, the bandwidth that OLT can distribute becomes P so
I+1'=P
0+ Δ
i
In order to prevent Δ under the lower situation of load
iThe unlimited increase in an embodiment of the invention, worked as Δ
i〉=P
0The time, P
I+1'=Δ
iLike this, the PON system finishes one to take turns the time of uploading shorter when load is low; And when load is heavier, still can guarantee the quality requirement that each is professional.At OLT is that each ONU distributes under the situation of some bandwidth in each cycle, even real-time fixed bit rate (CBR) business as speech business, because the clock of OLT side is just the same with ONU's, needs only and add that in the exit a bit of buffering just can recover this Business Stream fully.In addition, this execution mode can make OLT find initiate ONU as early as possible.This is because " paracycle " length is shorter when load is low, if just carry out once the search of initiate ONU every M (M is a constant) individual " paracycle ", the low stylish ONU of load can be found soon so.And when load was higher, though discovery time has prolonged, present embodiment still can guarantee in time to find new ONU.
As previously described, by the bandwidth allocation methods of " preferential in order " and the introducing of " paracycle ", PON can make full use of all bandwidth.And in one " paracycle ", the ONU that sends report message earlier has certain allocation priority to bandwidth.But, because being the initial period and the follow-up business data of the uplink time that distributes at OLT, the report message of ONU sends to OLT together, and OLT to be sequencing according to the report message that arrives be followed successively by the uplink time that ONU distributes next " paracycle ", this strategy that distributes earlier that arrives first will make ONU of first transmission report message in " paracycle " be in the limit priority of allocated bandwidth forever, thereby cause other ONU can not obtain fair treatment.
Therefore, in an embodiment of the invention, the strategy of employing " cyclic shift " overcomes the problem of allocated bandwidth injustice.Promptly in each " paracycle ", OLT does not handle the report message of first arrival immediately, but its information stores is got up; Since second report message, OLT distributes bandwidth with the method for " preferential in order "; After the processing of finishing last report message in this " paracycle ", OLT just handles the report message of first arrival, is the ONU distribution bandwidth of correspondence.Above-mentioned situation is actually at each and has realized in " paracycle " that ONU uploads the cyclic shift of order, and the shift step of this cyclic shift is 1.Fig. 4 has shown the schematic diagram of " cyclic shift ".Yet, it will be understood by those of skill in the art that the present invention does not make concrete regulation to the mode and the step-length of cyclic shift, only require that it can realize the traversal to various order.
Fig. 5 has shown the schematic diagram of optical network unit.As shown in the figure, optical network unit 50 comprises deriving means 51, buffer storage 52 and dispensing device 53.Wherein deriving means 51 obtains to comprise the report message of maximum queue state and the desired bandwidth information of minimum quene state from buffer storage, and this report message is sent to dispensing device 53.Buffer storage is used for the business datum of cache user, and in due course business datum is sent to dispensing device 53.When taking turns to the time slot of this optical network unit, dispensing device 53 sends business datum and report message to optical line terminal.
As previously described, be that first ONU that sends report has only to just processed at last under " cyclic shift " mode of 1 in step-length, this just makes uploading of this ONU increase by one times blanking time.Therefore, in an embodiment of the invention, in order to prevent that having paroxysmal business datum overflows during this period, the length of the buffer storage of each ONU is 3 times of average length of the business datum that arrives in two normal periods at least.
First ONU that sends report message carries out emptying its buffer storage substantially after the data upload in order to ensure each cycle, so that being arranged, more spatial cache stores the business datum of arrival, OLT should make all upload bandwidth except the assurance bandwidth that satisfies all ONU when the minimum of determining each ONU guarantees bandwidth, also should leave certain free space.In an embodiment of the invention, the desired average bandwidth of business datum that arrives in two normal periods as all ONU is L, and the bandwidth that on average guarantees of each ONU is G, and the bandwidth of this free space should be (L-G) 1 times～3 times at least.Considering under the quasi-periodic situation that the bandwidth of this free space can't produce any influence to uploading bandwidth utilization.
Fig. 6 has shown the schematic diagram of optical line terminal.As shown in the figure, optical line terminal 60 comprises receiving and processing device 61, is used for after receiving the business datum and report message that optical network unit is sent it being handled immediately.Optical line terminal 60 also comprises dispensing device, is used for after described processing unit is handled described report message, sends corresponding gating message to described optical network unit immediately.
Do not break away from design of the present invention and scope and can make many other changes and remodeling.Should be appreciated that to the invention is not restricted to specific execution mode, scope of the present invention is defined by the following claims.
Claims (27)
1. the distribution method of dynamic bandwidth of response fast in the EPON, described EPON comprises optical line terminal and a plurality of optical network unit, described optical line terminal communicates by any tree-like light distributed network and described a plurality of optical network unit to multiple spot, descending employing broadcast mode, up employing time division multiplexing mode, it is characterized in that described method comprises the steps:
Described optical network unit sends report message to described optical line terminal;
After receiving described report message, described optical line terminal is handled it immediately, and sends corresponding gating message to described optical network unit immediately.
2. the method for claim 1 is characterized in that, described report message and business datum send in same time slot.
3. the method for claim 1 is characterized in that, the length of described report message is fixed, and comprises two state informations: minimum quene state and maximum queue state, these two state informations are the length states that comprise complete data packet.
4. method as claimed in claim 3 is characterized in that, described optical line terminal is minimum bandwidth that guarantees of each optical network unit regulation.
5. method as claimed in claim 4 is characterized in that, the minimum of stipulating for each optical network unit guarantees that bandwidth satisfies following condition:
NG+(1～3)×(L-G)≤B
Wherein N is the number of optical network unit, and G to be optical line terminal the be average minimum bandwidth that guarantees of each optical network unit regulation, the desired average bandwidth of business datum that L arrives in two cycles for all optical network units, B is interior total bandwidth of uploading of cycle.
6. method as claimed in claim 4 is characterized in that, described minimum guarantees that bandwidth sends to optical network unit by the down management link.
7. method as claimed in claim 4 is characterized in that, the desired bandwidth sum of minimum quene state and report message is less than or equal to the minimum bandwidth that guarantees.
8. method as claimed in claim 4 is characterized in that, described gating message comprises that maximum requires bandwidth or minimum to require bandwidth value, and wherein, it is the desired bandwidth sum of maximum queue state and report message that maximum requires bandwidth; It is the desired bandwidth sum of minimum quene state and report message that minimum requires bandwidth.
9. method as claimed in claim 8, it is characterized in that, optical line terminal satisfies the requirement with the report message that arrives earlier in one-period earlier, when the maximum corresponding with this message requires bandwidth and the bandwidth of having reserved for the optical network unit that has sent report message and the minimum reserved for the optical network unit that does not send report message as yet when guaranteeing the bandwidth sum less than the total bandwidth in the one-period, optical line terminal comprises that for the optical network unit that sends this report message sends maximum requires the gating message of bandwidth value, otherwise transmission comprises that minimum requires the gating message of bandwidth value.
10. method as claimed in claim 9 is characterized in that, optical line terminal is a cyclic shift to the processing sequence of the report message of optical network unit.
11., it is characterized in that the time-multiplexed cycle is fixed as each described method among the claim 1-10.
12. as each described method among the claim 1-10, it is characterized in that the time-multiplexed cycle is not fixed, near the periodic quantity of certain standard, change.
13. the quick Dynamic Bandwidth Allocation system that responds in the EPON, described EPON comprises optical line terminal and a plurality of optical network unit, described optical line terminal communicates by any tree-like light distributed network and described a plurality of optical network unit to multiple spot, descending employing broadcast mode, up employing time division multiplexing mode, it is characterized in that
Described optical network unit sends report message to described optical line terminal;
After receiving described report message, described optical line terminal is handled it immediately, and sends corresponding gating message to described optical network unit immediately.
14. system as claimed in claim 13 is characterized in that, described report message and business datum send in same time slot.
15. system as claimed in claim 13 is characterized in that, the length of described report message is fixed, and comprises two state informations: minimum quene state and maximum queue state, these two state informations are the length states that comprise complete data packet.
16. system as claimed in claim 15 is characterized in that, described optical line terminal is minimum bandwidth that guarantees of each optical network unit regulation.
17. system as claimed in claim 16 is characterized in that, the minimum of stipulating for each optical network unit guarantees that bandwidth satisfies following condition:
NG+(1～3)×(L-G)≤B
Wherein N is the number of optical network unit, and G to be optical line terminal the be average minimum bandwidth that guarantees of each optical network unit regulation, the desired average bandwidth of business datum that L arrives in two cycles for all optical network units, B is interior total bandwidth of uploading of cycle.
18. system as claimed in claim 16 is characterized in that, described minimum guarantees that bandwidth sends to optical network unit by the down management link.
19. system as claimed in claim 16 is characterized in that, the desired bandwidth sum of minimum quene state and report message is less than or equal to the minimum bandwidth that guarantees.
20. system as claimed in claim 16 is characterized in that, described gating message comprises that maximum requires bandwidth or minimum to require bandwidth value, and wherein, it is the desired bandwidth sum of maximum queue state and report message that maximum requires bandwidth; It is the desired bandwidth sum of minimum quene state and report message that minimum requires bandwidth.
21. system as claimed in claim 20, it is characterized in that, optical line terminal satisfies the requirement with the report message that arrives earlier in one-period earlier, when the maximum corresponding with this message requires bandwidth and the bandwidth of having reserved for the optical network unit that has sent report message and the minimum reserved for the optical network unit that does not send report message as yet when guaranteeing the bandwidth sum less than the total bandwidth in the one-period, optical line terminal comprises that for the optical network unit that sends this report message sends maximum requires the gating message of bandwidth value, otherwise transmission comprises that minimum requires the gating message of bandwidth value.
22. system as claimed in claim 21 is characterized in that, optical line terminal is a cyclic shift to the processing sequence of the report message of optical network unit.
23., it is characterized in that the time-multiplexed cycle is fixed as each described system among the claim 13-22.
24. as each described system among the claim 13-22, it is characterized in that the time-multiplexed cycle is not fixed, near the periodic quantity of certain standard, change.
25. the optical network unit in the EPON is characterized in that it comprises:
Buffer storage is used for the buffer memory business datum;
Deriving means is used for obtaining report message from buffer storage;
Dispensing device, the report message that is used to send business datum and comes from deriving means from buffer storage.
26. optical network unit as claimed in claim 25 is characterized in that, the length of described buffer storage is 3 times of average length of the business datum that arrives in two cycles at least.
27. the optical line terminal in the EPON is characterized in that it comprises:
Receiving and processing device is used at once it being handled after receiving report message;
Dispensing device is used for after described receiving and processing device is handled described report message, sends corresponding gating message immediately.
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| CN101883294A (en) * | 2009-05-07 | 2010-11-10 | 华为技术有限公司 | Method and device for allocating uplink bandwidth |
| WO2011017992A1 (en) * | 2009-08-13 | 2011-02-17 | 中兴通讯股份有限公司 | Bandwidth allocation method and optical line terminal |
| CN101753431B (en) * | 2008-12-22 | 2012-01-11 | 中兴通讯股份有限公司 | Uplink bandwidth estimation method and device |
| CN102917282A (en) * | 2012-08-21 | 2013-02-06 | 北京邮电大学 | Priority dynamic wavelength bandwidth distribution method based on multiple threads |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008098449A1 (en) * | 2007-02-15 | 2008-08-21 | Huawei Technologies Co., Ltd. | A method for implementing and adjusting the bandwidth asymmetric transmission bearer network and the access side network element |
| WO2010054521A1 (en) * | 2008-11-11 | 2010-05-20 | 中兴通讯股份有限公司 | Link maintenance method and system, and optical line terminal |
| CN101741689B (en) * | 2008-11-11 | 2012-02-08 | 中兴通讯股份有限公司 | Method and system for maintaining link as well as optical line terminal |
| CN101753431B (en) * | 2008-12-22 | 2012-01-11 | 中兴通讯股份有限公司 | Uplink bandwidth estimation method and device |
| CN101883294A (en) * | 2009-05-07 | 2010-11-10 | 华为技术有限公司 | Method and device for allocating uplink bandwidth |
| CN101883294B (en) * | 2009-05-07 | 2013-08-07 | 华为技术有限公司 | Method and device for allocating uplink bandwidth |
| WO2011017992A1 (en) * | 2009-08-13 | 2011-02-17 | 中兴通讯股份有限公司 | Bandwidth allocation method and optical line terminal |
| CN102917282A (en) * | 2012-08-21 | 2013-02-06 | 北京邮电大学 | Priority dynamic wavelength bandwidth distribution method based on multiple threads |
| CN102917282B (en) * | 2012-08-21 | 2016-04-06 | 北京邮电大学 | A kind of priority dynamic wavelength bandwidth allocation methods based on multithreading |
| CN104994030A (en) * | 2015-05-11 | 2015-10-21 | 华中科技大学 | EPON communication system dynamic bandwidth allocation method used in intelligent power distribution network |
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| CN100574197C (en) | 2009-12-23 |
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