CN103684866A - Dynamic bandwidth allocation method for Ethernet passive optical network - Google Patents

Dynamic bandwidth allocation method for Ethernet passive optical network Download PDF

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CN103684866A
CN103684866A CN201310695950.6A CN201310695950A CN103684866A CN 103684866 A CN103684866 A CN 103684866A CN 201310695950 A CN201310695950 A CN 201310695950A CN 103684866 A CN103684866 A CN 103684866A
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optical network
token
network unit
bandwidth
distribution
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CN103684866B (en
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吕燕
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Chongqing aoputai Communication Technology Co.,Ltd.
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HEJI AOPUTAI COMMUNICATION TECHNOLOGY Co Ltd
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Abstract

The invention provides a dynamic bandwidth allocation method for the Ethernet passive optical network. The method is used for allocating uplink bandwidth of all optical network units in the Ethernet passive optical network. According to the method, parallel running of a token allocation thread and a bandwidth allocation thread is performed through an optical line terminal, the token allocation thread ensures a high token allocation finishing rate through iteration allocation, and the sum of the lengths of time slots corresponding to allocated tokens in each allocation period is adaptive to the time length of the corresponding allocation period; meanwhile, the bandwidth allocation thread allocates the bandwidth in a self-adaptive mode with a dynamic bandwidth allocation period by consuming the tokens to ensure high bandwidth allocation efficiency, and moreover the efficient token allocation process and the efficient bandwidth allocation process can be carried out continuously in an asynchronous mode in the environment of parallel running of the token allocation thread and the bandwidth allocation thread, so that bandwidth allocation precision is improved, the bandwidth use ratio is promoted, data transmission delay of the Ethernet passive optical network is reduced, and moreover processing logic is simpler and easier to achieve.

Description

A kind of distribution method of dynamic bandwidth of ethernet passive optical network
Technical field
The present invention relates to technical field of optical fiber communication, refer more particularly to ether fiber optical network communication technology field, be specifically related to a kind of distribution method of dynamic bandwidth of ethernet passive optical network.
Background technology
Ethernet passive optical network (EPON) is formed by connecting by Optical Distribution Network (ODN) by the optical network unit (ONU) that is positioned at the optical line terminal (OLT) of local side and is positioned at user side, at down direction (from OLT to ONU), adopt broadcast mode, up direction (from ONU to OLT) adopts time division multiple access access (TDMA) mode.For fear of conflict, OLT is an ascending time slot of each ONU distribution, ONU can only transmit data in authorized ascending time slot, and OLT is that the process of ONU arrangement ascending time slot is exactly the up process that realizes Dynamic Bandwidth Allocation (DBA, Dynamic Bandwidth Allocation) of GPON.Therefore, dynamic bandwidth allocation algorithm is directly connected to bandwidth availability ratio and the data delay of up channel, is the key of EPON technology.
In prior art, the DBA algorithm generally adopting is to interleave poll self adaptation Cycle Length (Interleaved Polling with Adaptive Cycle Time is called for short IPACT) algorithm based on statistic multiplexing.IPACT provides the statistic multiplexing between ONU and has brought thus upstream channel utilization comparatively efficiently, its weak point is, under low load, poll produces a large amount of MPCP(Multi-Point Control Protocol frequently, Multi-point Control Protocol) message makes down channel volume lowering, bandwidth lose increases, so data transfer delay is larger; In addition, because its Cycle Length is variable, assignable bandwidth is determined based on Cycle Length again, the two is closely associated, assignment logic more complicated, implement more difficultly, and also cause allocated bandwidth precision not high, be not suitable for the service of time delay and delay variation sensitivity or support service level agreement.
Thus, need a kind of possess more high bandwidth assignment accuracy and more the ethernet passive optical network system of the dynamic band width distributing ability of high bandwidth utilization.
Summary of the invention
Above-mentioned deficiency for prior art, the technical problem to be solved in the present invention is, the distribution method of dynamic bandwidth of the ethernet passive optical network that how to provide a kind of and be easier to realize, allocated bandwidth precision is higher, to promote bandwidth availability ratio, reduces the data transfer delay of ethernet passive optical network.
For solving the problems of the technologies described above, realize goal of the invention, the technical solution used in the present invention is as follows:
A distribution method of dynamic bandwidth for ethernet passive optical network, distributes for the upstream bandwidth to each optical network unit of ethernet passive optical network; Preset bandwidth allocation parameters that each optical network unit is corresponding and the capacity of token bucket; The bandwidth allocation parameters that each optical network unit is corresponding comprises minimum amount of bandwidth, maximum bandwidth value and weight coefficient; Then, by parallel running, having token to distribute the optical line terminal of thread and allocated bandwidth thread to carry out to the upstream bandwidth of each optical network unit in network distributes and controls; Wherein, token distributes thread in token bucket corresponding to each optical network unit in network, to distribute token with the assignment period fixed; Allocated bandwidth thread, with the Dynamic Bandwidth Allocation cycle, distributes corresponding bandwidth by the token quantity in each self-corresponding token bucket of each optical network unit in consumption network to it;
Described token distributes thread in token bucket corresponding to each optical network unit in network, to distribute the step of token as follows respectively at each assignment period:
1), according to each self-corresponding minimum amount of bandwidth of each optical network unit in network, to each optical network unit, carry out respectively the 1st sub-distribution of token in current assignment period:
Wherein, M represents each assignment period duration T ainterior distributed token sum, M=T a/ T ePON, T arepresent that token distributes the assignment period duration of thread, T ePONthe slot length that represents ethernet passive optical network, each token is corresponding to a slot length T of ethernet passive optical network ePON; A i(t 1) represent in current assignment period the token number to i optical network unit the 1st sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network;
Figure BDA0000439166440000022
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token number that can hold in the token bucket that i optical network unit is corresponding before,
Figure BDA0000439166440000023
p ithe capacity that represents the token bucket that i optical network unit is corresponding,
Figure BDA0000439166440000024
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token quantity of loading in the token bucket that i optical network unit is corresponding before;
Figure BDA0000439166440000025
represent i the minimum amount of bandwidth that optical network unit is corresponding, and
Figure BDA0000439166440000026
b tolrepresent the up total bandwidth that can distribute to optical network unit in network;
2) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after the 1st sub-distribution 1), and add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after the 1st sub-distribution; If so, remember the distribution number of times k=2 in current assignment period, continue execution step 3); Otherwise, jump to step 8);
3) according to each optical network unit in network each self-corresponding weight coefficient and maximum bandwidth value, to each optical network unit, carry out respectively the k sub-distribution of token in current assignment period:
Figure BDA0000439166440000027
Wherein, m (t k-1) represent in current assignment period that in network each optical network unit carries out remaining distributed token number after k-1 sub-distribution; A i(t k) represent in current assignment period the token number to i optical network unit k sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; β irepresent i the weight coefficient that optical network unit is corresponding,
Figure BDA0000439166440000031
β tolrepresent weight coefficient sum corresponding to each optical network unit in network;
Figure BDA0000439166440000032
be illustrated in k sub-distribution moment t in current assignment period kthe token number that can hold in the token bucket that i optical network unit is corresponding before, be illustrated in k sub-distribution moment t in current assignment period kthe token quantity of loading in the token bucket that i optical network unit is corresponding before;
Figure BDA0000439166440000034
represent in current assignment period to the token number summation of k-1 sub-distribution before i optical network unit;
Figure BDA0000439166440000035
represent that i optical network unit allows the highest number of tokens being assigned in single assignment period, represent i the maximum bandwidth value that optical network unit is corresponding, and Σ i = 1 N B max i ≥ B tol ;
4) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after k sub-distribution k); If m is (t k) >0, continue execution step 5); If m is (t k)=0, jumps to step 8);
5) add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after k sub-distribution; If so, continue execution step 6); Otherwise, jump to step 8);
6) in statistics network, whether exist in current assignment period before k sub-distribution to token number summation not yet reach it and allow the highest number of tokens being assigned to
Figure BDA0000439166440000039
optical network unit; If so, continue execution step 7); Otherwise, jump to step 8);
7) make the distribution number of times k in current assignment period add 1, then return to execution step 3);
8) token of current assignment period distributes end;
Described allocated bandwidth thread is whenever when the Dynamic Bandwidth Allocation cycle arrives, and being respectively each optical network unit, to carry out the step of allocated bandwidth as follows:
A) add up the token quantity of loading in each self-corresponding token bucket of each optical network unit in current Dynamic Bandwidth Allocation cycle due in network;
B) according to each optical network unit bandwidth on demand separately in the default allocated bandwidth thresholding of allocated bandwidth thread and network, be respectively each optical network unit and carry out allocated bandwidth:
Figure BDA0000439166440000038
Wherein, B i(t dBA) be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAbe the bandwidth that i optical network unit distributes, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; B 0represent default allocated bandwidth thresholding; the bandwidth on demand that represents i optical network unit;
Figure BDA0000439166440000042
be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAobtain before allocated bandwidth the token quantity of loading in the token bucket that i optical network unit is corresponding;
C) according to being the bandwidth that each optical network unit distributes at current Dynamic Bandwidth Allocation cycle due in, consume respectively the token of respective numbers in each self-corresponding token bucket of each optical network unit:
A con i ( t DBA ) = ( B I ( t DBA ) / B tol ) × M ;
Wherein, be illustrated in current Dynamic Bandwidth Allocation cycle due in and be i optical network unit and distribute after bandwidth, the token quantity consuming in token bucket corresponding to i optical network unit;
D) complete after the allocated bandwidth of each optical network unit in network and token consumption, the allocated bandwidth in current Dynamic Bandwidth Allocation cycle finishes.
In the distribution method of dynamic bandwidth of above-mentioned ethernet passive optical network, as a kind of prioritization scheme, the assignment period duration T that described token distributes thread to carry out token distribution aspan be 100～150 microseconds, and be the slot length T of ethernet passive optical network ePONintegral multiple.
In the distribution method of dynamic bandwidth of above-mentioned ethernet passive optical network, as a kind of prioritization scheme, described allocated bandwidth thread carries out the duration in each Dynamic Bandwidth Allocation cycle of allocated bandwidth, equal allocated bandwidth thread the corresponding Dynamic Bandwidth Allocation cycle be in network bandwidth that each optical network unit distributes summation.
Than prior art, the present invention has following advantage:
1, in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention, the token of optical line terminal distributes thread and the operation of allocated bandwidth thread parallel, token distributes thread to carry out token distribution with the assignment period of fixing, allocated bandwidth thread carries out allocated bandwidth with the Dynamic Bandwidth Allocation cycle, the dividing frequency of the two is separate, do not interfere with each other, processing logic is separately more clear, IPACT allocation algorithm than processing logic complexity in prior art, be easier to realize, therefore can adopt the pure hardware such as FPGA to realize, cost is low, speed is fast.
2, in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention, the token of optical line terminal distributes thread to carry out in the processing procedure of token distribution, only need to determine the token number distributing to each optical network unit according to the capacity of bandwidth allocation parameters corresponding to each optical network unit and token bucket, and allocated bandwidth thread carries out in the processing procedure of allocated bandwidth, also only need to determine the bandwidth value that each optical network unit is distributed according to the token number loading in token bucket corresponding to each optical network unit, these processes can be passed through the simple computation to bandwidth allocation parameters, the track record of token bucket state is determined, do not need to rely on and produce a large amount of MPCP message and determine to the frequent poll of optical network unit, thereby be conducive to reduce bandwidth lose, reduce data transfer delay.
3, in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention, the token of optical line terminal distributes thread to be distributed and well to be guaranteed that higher token is assigned rate by iteration, and the corresponding slot length sum of the token that completes distribution in each assignment period can adapt with assignment period duration, allocated bandwidth thread can carry out allocated bandwidth by consuming token adaptively with the Dynamic Bandwidth Allocation cycle again simultaneously, guarantee the efficiency of higher allocated bandwidth, and at token, distribute under the environment of thread and the operation of allocated bandwidth thread parallel, efficient token is distributed, the process of allocated bandwidth can be continued asynchronously carries out, thereby improve allocated bandwidth precision, promote bandwidth availability ratio, reduce the data transfer delay of ethernet passive optical network.
Accompanying drawing explanation
Fig. 1 be in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention token distribute thread at each assignment period respectively to the FB(flow block) of distributing token in token bucket corresponding to each optical network unit in network.
Fig. 2 be in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention allocated bandwidth thread whenever be respectively the FB(flow block) that each optical network unit carries out allocated bandwidth when the Dynamic Bandwidth Allocation cycle arrives.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is further illustrated.
The invention provides a kind of distribution method of dynamic bandwidth of ethernet passive optical network, for the upstream bandwidth to each optical network unit of ethernet passive optical network (ONU), distribute, this upstream bandwidth distributes the still optical line terminal in ethernet passive optical network (OLT) execution of control procedure; But unlike the prior art, in the distribution method of dynamic bandwidth of ethernet passive optical network of the present invention, in optical line terminal, parallel running has two separate mission threads, is respectively token and distributes thread and allocated bandwidth thread, by these two mission threads allocated bandwidth of having cooperated with each other; Wherein, token distributes thread in token bucket corresponding to each optical network unit in network, to distribute token with the assignment period fixed; Allocated bandwidth thread, with the Dynamic Bandwidth Allocation cycle, distributes corresponding bandwidth by the token quantity in each self-corresponding token bucket of each optical network unit in consumption network to it.Optical line terminal utilizes token to distribute the task between thread and allocated bandwidth thread distribute and cooperate with each other, and improves the assignment accuracy of bandwidth, reaches the object that promotes bandwidth availability ratio.In order to make the advantage of distribution method of dynamic bandwidth of the present invention be able to composition, embody, to token in optical line terminal, distribute thread and allocated bandwidth thread specific works process to be illustrated below.
The token of optical line terminal distributes thread in conjunction with token bucket algorithm, adopted fixing assignment period to carry out the allocation process of token, its assignment period and the Dynamic Bandwidth Allocation cycle of allocated bandwidth thread are independently opened mutually, assignment logic is simplified, be easier to realize, and the mode that has adopted iteration to distribute, the token that improves as much as possible each assignment period is assigned rate.Token distributes thread at each assignment period respectively to the flow process of distributing token in token bucket corresponding to each optical network unit in network as shown in Figure 1, and concrete steps are as follows:
1), according to each self-corresponding minimum amount of bandwidth of each optical network unit in network, to each optical network unit, carry out respectively the 1st sub-distribution of token in current assignment period:
Figure BDA0000439166440000061
Wherein, M represents each assignment period duration T ainterior distributed token sum, M=T a/ T ePON, T arepresent that token distributes the assignment period duration of thread, T ePONthe slot length that represents ethernet passive optical network, each token is corresponding to a slot length T of ethernet passive optical network ePON; A i(t 1) represent in current assignment period the token number to i optical network unit the 1st sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network;
Figure BDA0000439166440000062
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token number that can hold in the token bucket that i optical network unit is corresponding before,
Figure BDA0000439166440000063
p ithe capacity that represents the token bucket that i optical network unit is corresponding,
Figure BDA0000439166440000064
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token quantity of loading in the token bucket that i optical network unit is corresponding before;
Figure BDA0000439166440000065
represent i the minimum amount of bandwidth that optical network unit is corresponding, and b tolrepresent the up total bandwidth that can distribute to optical network unit in network.
This step is for carrying out the 1st sub-distribution of token in current assignment period to each optical network unit.Wherein, the token number A to the 1st sub-distribution of each optical network unit i(t 1) receive the minimum amount of bandwidth that corresponding light network element is corresponding
Figure BDA0000439166440000067
and token bucket capacity P irestriction.Due to
Figure BDA0000439166440000068
therefore,, even if the token number that can hold at token bucket corresponding to each optical network unit is all enough, to the token number of each optical network unit the 1st sub-distribution in network, be
Figure BDA0000439166440000069
situation under, still have
Figure BDA00004391664400000610
so after the 1st sub-distribution, must also there is the remaining token that distributes in current assignment period.
2) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after the 1st sub-distribution 1), and add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after the 1st sub-distribution; If so, remember the distribution number of times k=2 in current assignment period, continue execution step 3); Otherwise, jump to step 8).
In this step, to whether existing the not yet fully loaded optical network unit of token bucket add up and judge in network after the 1st sub-distribution in current assignment period.Reason is: owing to the token number of each optical network unit the 1st sub-distribution being subject to the restriction of token bucket capacity corresponding to corresponding light network element, if be mounted with a fairly large number of token in the token bucket that optical network unit is corresponding before the 1st sub-distribution, after the 1st sub-distribution, token bucket corresponding to optical network unit may be fully loaded with and cannot continue to have received the distribution of token; If after the 1st sub-distribution, the token bucket that each optical network unit in system is corresponding is all fully loaded, in current assignment period, cannot continue to distribute the remaining token number that distributes again, and therefore jumps to step 8); If after the 1st sub-distribution, also there is the not yet fully loaded optical network unit of token bucket, perform step 3), continue to distribute the remaining token number that distributes.
3) according to each optical network unit in network each self-corresponding weight coefficient and maximum bandwidth value, to each optical network unit, carry out respectively the k sub-distribution of token in current assignment period:
Figure BDA0000439166440000071
Wherein, m (t k-1) represent in current assignment period that in network each optical network unit carries out remaining distributed token number after k-1 sub-distribution; A i(t k) represent in current assignment period the token number to i optical network unit k sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; β irepresent i the weight coefficient that optical network unit is corresponding,
Figure BDA0000439166440000072
β tolrepresent weight coefficient sum corresponding to each optical network unit in network;
Figure BDA0000439166440000073
be illustrated in k sub-distribution moment t in current assignment period kthe token number that can hold in the token bucket that i optical network unit is corresponding before,
Figure BDA0000439166440000074
be illustrated in k sub-distribution moment t in current assignment period kthe token quantity of loading in the token bucket that i optical network unit is corresponding before;
Figure BDA0000439166440000075
represent in current assignment period to the token number summation of k-1 sub-distribution before i optical network unit;
Figure BDA0000439166440000076
represent that i optical network unit allows the highest number of tokens being assigned in single assignment period,
Figure BDA0000439166440000077
represent i the maximum bandwidth value that optical network unit is corresponding, and Σ i = 1 N B max i ≥ B tol .
In distribution method of dynamic bandwidth of the present invention, token distributes 2nd sub-distribution of thread in each assignment period to start, according to each self-corresponding weight coefficient of each optical network unit and maximum bandwidth value, carry out the distribution of token, its distribution principle is that each optical network unit is pressed to its corresponding weight coefficient β iproportion distributes the remaining token number that distributes, but the token number being assigned to can not exceed the token bucket capacity P that optical network unit is corresponding again irestriction, simultaneously can't exceed optical network unit and in single assignment period, allow the highest number of tokens being assigned to
Figure BDA0000439166440000079
restriction, the maximum bandwidth value corresponding according to optical network unit and determine.So in the k sub-distribution in current assignment period, the token number A that each optical network unit is assigned to i(t k) by above formula, determine.It should be noted that in distribution method of dynamic bandwidth of the present invention, set the maximum bandwidth value sum that each optical network unit is corresponding
Figure BDA00004391664400000712
by known each optical network unit of simple reckoning, in single assignment period, allow the highest number of tokens sum being assigned to
Figure BDA00004391664400000713
guaranteed that thus token distributes thread to possess each assignment period duration T ainterior M can distribute the token of token to be assigned rate to reach 100% ability.
4) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after k sub-distribution k); If m is (t k) >0, continue execution step 5); If m is (t k)=0, jumps to step 8).
This step is used for judging in current assignment period, whether to also have the remaining token that distributes; If the remaining token number that distributes is zero in current assignment period, show in current assignment period that M the token that can distribute token is assigned rate and reaches to 100%, token allocating task completes, therefore jumps to step 8); If also have the remaining token that distributes in current assignment period, further judge whether to continue to distribute execution step 5).
5) add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after k sub-distribution; If so, continue execution step 6); Otherwise, jump to step 8).
This step is used for judging in current assignment period, whether to continue to distribute the remaining token that distributes; If after k sub-distribution, the token bucket that each optical network unit in system is corresponding is all fully loaded, in current assignment period, cannot continue to distribute the remaining token number that distributes again, and therefore jumps to step 8); If after k sub-distribution, also there is the not yet fully loaded optical network unit of token bucket, further judge whether to allow to continue to distribute execution step 6);
6) in statistics network, whether exist in current assignment period before k sub-distribution to token number summation not yet reach it and allow the highest number of tokens being assigned to
Figure BDA0000439166440000081
optical network unit; If so, continue execution step 7); Otherwise, jump to step 8).
This step is used for judging in current assignment period whether also allow continuation to distribute the remaining token that distributes; If after k sub-distribution, each optical network unit in system has all reached it and has allowed the highest number of tokens being assigned to
Figure BDA0000439166440000082
in current assignment period, do not allow to continue again to distribute the remaining token number that distributes, therefore jump to step 8); If after k sub-distribution, also exist not yet to reach it and allow the highest number of tokens being assigned to
Figure BDA0000439166440000083
optical network unit, perform step 7), continue to distribute the remaining token number that distributes.
7) make the distribution number of times k in current assignment period add 1, then return to execution step 3).
In current period, to remaining continuation distribution method of distributing token number, the iteration of being undertaken again by mode described in step 3) is distributed, and after therefore the distribution number of times k in current assignment period correspondingly adds 1, the processing logic that is back to step 3) is carried out.
8) token of current assignment period distributes end.
When carrying out step 8), show that the token allocating task of current assignment period completes, or can not, not allow to continue again to distribute, therefore the distribution of the token of current assignment period finishes.
The handling process of distributing thread to carry out token distribution at each assignment period by above-mentioned token can be seen, due to the slot length T of each token corresponding to ethernet passive optical network ePON, and each assignment period duration T ainterior distributed token sum M=T a/ T ePON, so interior M of each assignment period can distribute the slot length sum that token is corresponding to be and assignment period duration T a(if the assignment period duration T adapting athe value slot length T that is ethernet passive optical network ePONintegral multiple, in each assignment period M can distribute the slot length sum that token is corresponding to be and assignment period duration T aequate); Meanwhile, the mode that the present invention distributes by iteration, in the situation that the token space that in network, the token bucket of each optical network unit can hold permission, each assignment period duration T ainterior M can distribute the token of token to be assigned rate can reach 100%, make to complete in each assignment period distribution the corresponding slot length sum of token can with assignment period duration T aadapt, thereby reduce as much as possible the corresponding slot length sum of token and the assignment period duration T that completes distribution in each assignment period abetween time difference loss.
On the other hand, the allocated bandwidth thread of optical line terminal adopts the Dynamic Bandwidth Allocation cycle to carry out the allocation process of bandwidth, by the token quantity in each self-corresponding token bucket of each optical network unit in consumption network, to it, distribute corresponding bandwidth, distribute thread to distribute the processing of token to match in optical network unit token bucket with token, utilize token to distribute the higher token of thread to be assigned rate, realize the high accuracy of bandwidth and distribute, to promote bandwidth availability ratio.Allocated bandwidth thread is whenever when the Dynamic Bandwidth Allocation cycle arrives, and is respectively flow process that each optical network unit carries out allocated bandwidth as shown in Figure 2, and concrete steps are as follows:
A) add up the token quantity of loading in each self-corresponding token bucket of each optical network unit in current Dynamic Bandwidth Allocation cycle due in network.
Allocated bandwidth thread is to it, to distribute corresponding bandwidth by the token quantity in each self-corresponding token bucket of each optical network unit in consumption network, therefore need to add up the token quantity of loading in each self-corresponding token bucket of each optical network unit and whether meet distribution requirement.
B) according to each optical network unit bandwidth on demand separately in the default allocated bandwidth thresholding of allocated bandwidth thread and network, be respectively each optical network unit and carry out allocated bandwidth:
Figure BDA0000439166440000091
Wherein, B i(t dBA) be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAbe the bandwidth that i optical network unit distributes, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; B 0represent default allocated bandwidth thresholding;
Figure BDA0000439166440000092
the bandwidth on demand that represents i optical network unit;
Figure BDA0000439166440000093
be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAobtain before allocated bandwidth the token quantity of loading in the token bucket that i optical network unit is corresponding.
In distribution method of dynamic bandwidth of the present invention, allocated bandwidth thread is according to each optical network unit bandwidth on demand separately in its default allocated bandwidth thresholding and network, judge whether the token quantity of loading in each self-corresponding token bucket of each optical network unit meets distribution requirement, and its distribution principle is: if slot length sum corresponding to the token quantity of loading in the token bucket of optical network unit
Figure BDA0000439166440000094
reached its bandwidth on demand
Figure BDA0000439166440000095
press bandwidth on demand
Figure BDA0000439166440000096
for it distributes bandwidth; If the slot length sum that the token quantity of loading in the token bucket of optical network unit is corresponding
Figure BDA0000439166440000101
not yet reach its bandwidth on demand
Figure BDA0000439166440000102
but surpassed the default allocated bandwidth thresholding B of allocated bandwidth thread 0, by allocated bandwidth thresholding B 0for it distributes bandwidth; If the slot length sum that the token quantity of loading in the token bucket of optical network unit is corresponding not yet reach allocated bandwidth thresholding B 0, the current Dynamic Bandwidth Allocation cycle wouldn't be distributed bandwidth.So when the current Dynamic Bandwidth Allocation cycle arrives, the bandwidth B that each optical network unit is assigned to i(t dBA) by above formula, determine.It should be noted that, in distribution method of dynamic bandwidth of the present invention, allocated bandwidth thread carries out allocated bandwidth control by default allocated bandwidth thresholding, in the situation that the bandwidth on demand that makes optical network unit large (surpassing allocated bandwidth thresholding) and the token number loading in its token bucket cannot be satisfied, upstream bandwidth also can be distributed timely according to allocated bandwidth thresholding, in order to keep consuming to a certain extent the speed of token, making token distribute thread can carry out lasting token distributes, thereby utilize token to distribute, the circulation consuming drives the efficiency that improves allocated bandwidth, promote bandwidth availability ratio, meanwhile, for the token number loading in board bucket, cannot meet the optical network unit of allocated bandwidth thresholding, temporarily wide regardless of wearing, to avoid distributing too scattered bandwidth, cannot effectively utilize, cause the waste of bandwidth.And allocated bandwidth thresholding B 0value, need to determine according to the practical situations of ethernet passive optical network, for example, can be by allocated bandwidth thresholding B 0the minimum amount of bandwidth that value is transmitted for realizing valid data, or can be by allocated bandwidth thresholding B 0value, also can be by allocated bandwidth thresholding B for realizing the minimum amount of bandwidth of specified type transfer of data 0value is the upstream bandwidth mean value of each optical network unit in network, etc.
C) according to being the bandwidth that each optical network unit distributes at current Dynamic Bandwidth Allocation cycle due in, consume respectively the token of respective numbers in each self-corresponding token bucket of each optical network unit:
A con i ( t DBA ) = ( B i ( t DBA ) / B tol ) × M ;
Wherein, be illustrated in current Dynamic Bandwidth Allocation cycle due in and be i optical network unit and distribute after bandwidth, the token quantity consuming in token bucket corresponding to i optical network unit.
By consuming the token of respective numbers, making can have more spatial accommodation in token bucket that optical network unit is corresponding, and the token that distributes thread to distribute in order to hold token makes that token distributes, the process of allocated bandwidth can be continued to carry out asynchronously.
D) complete after the allocated bandwidth of each optical network unit in network and token consumption, the allocated bandwidth in current Dynamic Bandwidth Allocation cycle finishes.
By above-mentioned allocated bandwidth thread, whenever carry out the handling process of allocated bandwidth when the Dynamic Bandwidth Allocation cycle arrives, can see, at token, distribute thread to guarantee in the token bucket of each optical network unit, constantly to obtain in network under the prerequisite of token distribution, allocated bandwidth thread just can be with the Dynamic Bandwidth Allocation cycle constantly by carrying out allocated bandwidth to each optical network unit respectively by consuming token.In addition, in conjunction with the bandwidth allocation process flow process of allocated bandwidth thread and the token allocation process flow process of token distribution thread, can see, token distributes thread and the operation of allocated bandwidth thread parallel, token distributes thread to carry out token distribution with the assignment period of fixing, allocated bandwidth thread carries out allocated bandwidth with the Dynamic Bandwidth Allocation cycle, the dividing frequency of the two is separate, do not interfere with each other, processing logic is separately more clear, than the IPACT allocation algorithm of processing logic complexity in prior art, be easier to realize, simultaneously, token distributes in the token allocation process process of thread, only need to determine the token number distributing to each optical network unit according to the capacity of bandwidth allocation parameters corresponding to each optical network unit and token bucket, and in the bandwidth allocation process process of allocated bandwidth thread, also only need to determine the bandwidth value that each optical network unit is distributed according to the token number loading in token bucket corresponding to each optical network unit, these processes can be passed through the simple computation to bandwidth allocation parameters, the track record of token bucket state is determined, do not need to rely on and produce a large amount of MPCP message and determine to the frequent poll of optical network unit, thereby be conducive to reduce bandwidth lose, reduce data transfer delay, and, in distribution method of dynamic bandwidth of the present invention, token distributes thread to be distributed and well to be guaranteed that higher token is assigned rate by iteration, and the corresponding slot length sum of the token that completes distribution in each assignment period can adapt with assignment period duration, allocated bandwidth thread can carry out allocated bandwidth by consuming token adaptively with the Dynamic Bandwidth Allocation cycle again simultaneously, guarantee the efficiency of higher allocated bandwidth, and at token, distribute under the environment of thread and the operation of allocated bandwidth thread parallel, efficient token is distributed, the process of allocated bandwidth can be continued asynchronously carries out, thereby improve allocated bandwidth precision, promote bandwidth availability ratio, reduce the data transfer delay of ethernet passive optical network.
In concrete application implementation process, in order better to guarantee that allocated bandwidth thread carries out the Dynamic Bandwidth Allocation cycle of allocated bandwidth and the bandwidth value of its distribution to adapting, avoid allocated bandwidth leading, reduce allocated bandwidth and postpone, allocated bandwidth thread carries out the duration in each Dynamic Bandwidth Allocation cycle of allocated bandwidth, preferably equal allocated bandwidth thread the corresponding Dynamic Bandwidth Allocation cycle be in network bandwidth that each optical network unit distributes summation.Be preferably represent that allocated bandwidth thread carries out j Dynamic Bandwidth Allocation cycle duration of allocated bandwidth,
Figure BDA0000439166440000112
be illustrated in j Dynamic Bandwidth Allocation cycle due in
Figure BDA0000439166440000113
be the bandwidth that i optical network unit distributes, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network.Consider in addition, if the assignment period duration T that token distributes thread to carry out token distribution aset long, token dividing frequency is too low, in the time of may making allocated bandwidth thread carry out allocated bandwidth with the Dynamic Bandwidth Allocation cycle, because distributing, token in the token bucket cause not in time optical network unit, there is no enough tokens to be consumed to cause that allocated bandwidth precision reduces, bandwidth availability ratio declines; And if the assignment period duration T that token distributes thread to carry out token distribution aset too short, token dividing frequency is too high, in the time of may making the enough and allocated bandwidth thread of the token quantity of loading in network element token bucket also not yet have enough time to consume, token distributes thread to carry out repeatedly unnecessary token batch operation, causes token allocation process resource to cross and contains and waste.Therefore, token distributes the assignment period duration T that thread carries out token distribution aset, the speed of carrying out allocated bandwidth with allocated bandwidth thread by consuming token adapts, and is the target of guaranteeing allocated bandwidth precision, reducing the wasting of resources of token allocation process.Consider thus, for the allocated bandwidth speed of common ethernet passive optical network, the assignment period duration T that token distributes thread to carry out token distribution aspan comparatively suitable between 100～150 microseconds; Meanwhile, assignment period duration T avalue be preferably the slot length T of ethernet passive optical network ePONintegral multiple, be so more conducive to reduce token and distribute the corresponding slot length sum of token and the assignment period duration T that completes distribution in each assignment period of thread abetween time difference loss, guarantee higher allocated bandwidth efficiency.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (3)

1. a distribution method of dynamic bandwidth for ethernet passive optical network, distributes for the upstream bandwidth to each optical network unit of ethernet passive optical network; It is characterized in that, preset bandwidth allocation parameters that each optical network unit is corresponding and the capacity of token bucket; The bandwidth allocation parameters that each optical network unit is corresponding comprises minimum amount of bandwidth, maximum bandwidth value and weight coefficient; Then, by parallel running, having token to distribute the optical line terminal of thread and allocated bandwidth thread to carry out to the upstream bandwidth of each optical network unit in network distributes and controls; Wherein, token distributes thread in token bucket corresponding to each optical network unit in network, to distribute token with the assignment period fixed; Allocated bandwidth thread, with the Dynamic Bandwidth Allocation cycle, distributes corresponding bandwidth by the token quantity in each self-corresponding token bucket of each optical network unit in consumption network to it;
Described token distributes thread in token bucket corresponding to each optical network unit in network, to distribute the step of token as follows respectively at each assignment period:
1), according to each self-corresponding minimum amount of bandwidth of each optical network unit in network, to each optical network unit, carry out respectively the 1st sub-distribution of token in current assignment period:
Figure FDA0000439166430000011
Wherein, M represents each assignment period duration T ainterior distributed token sum, M=T a/ T ePON, T arepresent that token distributes the assignment period duration of thread, T ePONthe slot length that represents ethernet passive optical network, each token is corresponding to a slot length T of ethernet passive optical network ePON; A i(t 1) represent in current assignment period the token number to i optical network unit the 1st sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network;
Figure FDA0000439166430000012
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token number that can hold in the token bucket that i optical network unit is corresponding before,
Figure FDA0000439166430000013
p ithe capacity that represents the token bucket that i optical network unit is corresponding,
Figure FDA0000439166430000014
be illustrated in the 1st sub-distribution moment t in current assignment period 1the token quantity of loading in the token bucket that i optical network unit is corresponding before;
Figure FDA0000439166430000015
represent i the minimum amount of bandwidth that optical network unit is corresponding, and
Figure FDA0000439166430000016
b tolrepresent the up total bandwidth that can distribute to optical network unit in network;
2) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after the 1st sub-distribution 1), and add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after the 1st sub-distribution; If so, remember the distribution number of times k=2 in current assignment period, continue execution step 3); Otherwise, jump to step 8);
3) according to each optical network unit in network each self-corresponding weight coefficient and maximum bandwidth value, to each optical network unit, carry out respectively the k sub-distribution of token in current assignment period:
Figure FDA0000439166430000021
Wherein, m (t k-1) represent in current assignment period that in network each optical network unit carries out remaining distributed token number after k-1 sub-distribution; A i(t k) represent in current assignment period the token number to i optical network unit k sub-distribution, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; β irepresent i the weight coefficient that optical network unit is corresponding,
Figure FDA0000439166430000022
β tolrepresent weight coefficient sum corresponding to each optical network unit in network;
Figure FDA0000439166430000023
be illustrated in k sub-distribution moment t in current assignment period kthe token number that can hold in the token bucket that i optical network unit is corresponding before,
Figure FDA0000439166430000024
be illustrated in k sub-distribution moment t in current assignment period kthe token quantity of loading in the token bucket that i optical network unit is corresponding before; represent in current assignment period to the token number summation of k-1 sub-distribution before i optical network unit;
Figure FDA0000439166430000026
represent that i optical network unit allows the highest number of tokens being assigned in single assignment period,
Figure FDA0000439166430000027
represent i the maximum bandwidth value that optical network unit is corresponding, and Σ i = 1 N B max i ≥ B tol ;
4) add up in current assignment period in network each optical network unit and carry out remaining distributed token number m (t after k sub-distribution k); If m is (t k) >0, continue execution step 5); If m is (t k)=0, jumps to step 8);
5) add up in current assignment period in network, whether have the not yet fully loaded optical network unit of token bucket after k sub-distribution; If so, continue execution step 6); Otherwise, jump to step 8);
6) in statistics network, whether exist in current assignment period before k sub-distribution to token number summation not yet reach it and allow the highest number of tokens being assigned to
Figure FDA0000439166430000029
optical network unit; If so, continue execution step 7); Otherwise, jump to step 8);
7) make the distribution number of times k in current assignment period add 1, then return to execution step 3);
8) token of current assignment period distributes end;
Described allocated bandwidth thread is whenever when the Dynamic Bandwidth Allocation cycle arrives, and being respectively each optical network unit, to carry out the step of allocated bandwidth as follows:
A) add up the token quantity of loading in each self-corresponding token bucket of each optical network unit in current Dynamic Bandwidth Allocation cycle due in network;
B) according to each optical network unit bandwidth on demand separately in the default allocated bandwidth thresholding of allocated bandwidth thread and network, be respectively each optical network unit and carry out allocated bandwidth:
Figure FDA0000439166430000031
Wherein, B i(t dBA) be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAbe the bandwidth that i optical network unit distributes, i ∈ 1,2 ..., and N}, N represents the quantity of optical network unit in network; B 0represent default allocated bandwidth thresholding;
Figure FDA0000439166430000032
the bandwidth on demand that represents i optical network unit;
Figure FDA0000439166430000033
be illustrated in current Dynamic Bandwidth Allocation cycle due in t dBAobtain before allocated bandwidth the token quantity of loading in the token bucket that i optical network unit is corresponding;
C) according to being the bandwidth that each optical network unit distributes at current Dynamic Bandwidth Allocation cycle due in, consume respectively the token of respective numbers in each self-corresponding token bucket of each optical network unit:
A con i ( t DBA ) = ( B i ( t DBA ) / B tol ) × M ;
Wherein,
Figure FDA0000439166430000035
be illustrated in current Dynamic Bandwidth Allocation cycle due in and be i optical network unit and distribute after bandwidth, the token quantity consuming in token bucket corresponding to i optical network unit;
D) complete after the allocated bandwidth of each optical network unit in network and token consumption, the allocated bandwidth in current Dynamic Bandwidth Allocation cycle finishes.
2. the distribution method of dynamic bandwidth of ethernet passive optical network according to claim 1, is characterized in that, the assignment period duration T that described token distributes thread to carry out token distribution aspan be 100～150 microseconds, and be the slot length T of ethernet passive optical network ePONintegral multiple.
3. the distribution method of dynamic bandwidth of ethernet passive optical network according to claim 1, it is characterized in that, described allocated bandwidth thread carries out the duration in each Dynamic Bandwidth Allocation cycle of allocated bandwidth, equal allocated bandwidth thread the corresponding Dynamic Bandwidth Allocation cycle be in network bandwidth that each optical network unit distributes summation.
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