CN106656844A - PON port load balancing method and device supporting SLA (Service Level Agreement) - Google Patents

PON port load balancing method and device supporting SLA (Service Level Agreement) Download PDF

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Publication number
CN106656844A
CN106656844A CN201611069734.0A CN201611069734A CN106656844A CN 106656844 A CN106656844 A CN 106656844A CN 201611069734 A CN201611069734 A CN 201611069734A CN 106656844 A CN106656844 A CN 106656844A
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China
Prior art keywords
bandwidth
onu
pon
distribution
load
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CN201611069734.0A
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Chinese (zh)
Inventor
王磊
王岩
陈雪
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN201611069734.0A priority Critical patent/CN106656844A/en
Publication of CN106656844A publication Critical patent/CN106656844A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention provides a PON port load balancing method and device supporting an SLA (Service Level Agreement). The PON port load balancing method comprises the steps of: carrying out statistics on a requested bandwidth average value (with reference to the specification) of each ONU; according to the requested bandwidth average value and preset SLA parameters, calculating a bandwidth Ri allocated to each ONU; according to a mapping relationship between the ONUs and PON ports, carrying out statistics on a sum (with reference to the specification) of the bandwidths allocated to all the ONUs on each PON port; and selecting a target ONU which needs to be regulated, and regulating the target OUN to the suitable PON port. When a flow conflict is avoided, a bandwidth utilization rate can be improved, differentiated demands of users are met, and user experience is promoted.

Description

A kind of PON mouths load-balancing method and device for supporting the grade of service
Technical field
The present invention relates to communication technical field, more particularly, to the PON mouths load-balancing method for supporting the grade of service and Device.
Background technology
The one preferred technique that passive optical-fiber network PON is accessed as the big bandwidth of user, has been deployed in more and more the whole world In the broadband access network of various places, the big bandwidth that a kind of lower deployment cost is low, maintenance cost is low and flexibility is high is provided the user and has passed Send means.
However, due to tunable wave length cannot be realized in traditional PON so that optical network unit ONU can not be flexible Choose PON mouths.Additionally, with access network number of users be continuously increased and user's request variation, occur in that difference PON branches on load imbalance phenomenon, cause that user's downloading data speed under the PON branches of high capacity is slow, user Experience is poor.
In recent years, PON technologies constantly develop, and the wavelength tuning technology of ONU is quite ripe in PON system so that logical Cross flexible dispatching ONU between different PON mouths and realize that load balancing is possibly realized.
The focus of research is had become based on the load-balancing algorithm of PON system.Load balancing is played the part of in terms of traffic management Important role is drilled, by the way that the ONU being operated under high capacity PON mouths is adjusted under the PON mouths of low-load, it is to avoid flow is rushed Prominent generation, is effectively improved bandwidth availability ratio.Meanwhile, load balancing be also convenient for service provider be dynamically responsive to network bear The real-time change of load.
But, the algorithm for proposing at present is all the foundation using the flow of the actual generation of user side as load balancing, not There is the present situation for considering service-level agreement (SLA) differentiation between bandwidth overage reservation and different user.
Along with big flow, the popularization of big broadband services, needs are added to bandwidth on the basis of original load-balancing technique The consideration of oversubscription and user service grade (SLA), proposes new load balancing scheme to meet user service differentiation Demand.
The content of the invention
The present invention provides a kind of PON mouths load-balancing method and device for supporting SLA so that avoiding flow conflict, carrying The differentiated demand of user is met while high bandwidth utilization, Consumer's Experience is lifted.
One aspect of the present invention, there is provided a kind of PON mouth load-balancing methods for supporting the grade of service, methods described includes：
Step S1, counts each ONU bandwidth on demand mean value
Step S2, according to bandwidth on demand mean value and grade of service SLA parameter set in advance, is calculated as each ONU point Bandwidth R matched somebody with somebodyi；
Step S3, according to the mapping relations of ONU and PON mouths, counts all ONU distribution bandwidths sums on each PON mouths
Step S4, choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths.
Further, step S1, counts each ONU bandwidth on demand mean value RL i, specially：
One dynamic wavelength assignment DWA cycle includes multiple Dynamic Bandwidth Allocation DBA cycles；
Each ONU reports bandwidth request within each DBA cycle；
Within a DWA cycle, the mean value of the bandwidth request in multiple DBA cycles is calculated, obtain each ONU bandwidth on demand Mean value
Further, step S2, according to bandwidth on demand mean value and grade of service SLA parameter set in advance, meter Calculate bandwidth R for each ONU distributioni, specially：
Calculate the guarantee bandwidth of each OUN
Calculate the excess bandwidth of each ONU
To ensureing that bandwidth is sued for peace with excess bandwidth, the bandwidth for each ONU distribution is obtained
Further, the guarantee bandwidth, the concrete calculating of excess bandwidth includes：
Ensure bandwidth
By the excess bandwidth that weight is each ONU distribution
Excess bandwidth total amount SE：
It is OLT according to the bandwidth that power system capacity is that ONU is reserved for fixed-bandwidth；
For guaranteed bandwidth, when the demand of ONU is more thanWhen, system can distribute band in the form of guaranteed bandwidth as its continuation Width, distribution the upper limit not overIf the ONU demands are less, remainder guaranteed bandwidth distributes to other ONU；
For excess bandwidth, it is the bandwidth for meeting ONU demand assignments outside fixed-bandwidth and guaranteed bandwidth to be；
WiFor the distribution weight of excess bandwidth,
C is the total capacity of PON system.
Further, step S4, choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths, Specifically include：
Under the maximum PON mouths of load, qualified ONU is chosen, if finding qualified ONU, by the OUN adjustment To the PON mouths that load is minimum, the mapping relations of ONU and PON mouths are updated；If under the maximum PON mouths of load, not finding and meeting bar Part, find qualified ONU from secondary maximum PON mouths；Searching process continues, until traveling through all of PON mouths.
Another aspect of the present invention, there is provided a kind of PON mouth load balancing apparatus for supporting the grade of service, described device includes：
Bandwidth on demand computing unit, counts each ONU bandwidth on demand mean value
Distribution bandwidth processing unit, according to bandwidth on demand mean value and grade of service SLA parameter set in advance, is calculated as Bandwidth R of each ONU distributioni；
Statistics sum unit, according to the mapping relations of ONU and PON mouths, count on each PON mouths all ONU distribution bandwidths it With
Adjustment of load unit, choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths.
Further, the bandwidth on demand computing unit is specifically included：
Bandwidth request reports subelement, for reporting bandwidth request within each DBA cycle for each ONU；
Average bandwidth computation subunit, within a DWA cycle, calculate multiple DBA cycles bandwidth request it is flat Average, obtains each ONU bandwidth on demand mean valueWherein, dynamic wavelength assignment DWA cycle include multiple dynamic bandwidths The distribution DBA cycles.
Further, the distribution bandwidth processing unit is specifically included：
Ensure bandwidth calculation subelement, for calculating the guarantee bandwidth of each OUN
Excess bandwidth subelement, for calculating the excess bandwidth of each ONU
Distribution bandwidth computation subunit, for ensureing that bandwidth and excess bandwidth are sued for peace, obtain for
The bandwidth of each ONU distribution
Wherein,
Ensure bandwidth
By the excess bandwidth that weight is each ONU distribution
Excess bandwidth total amount SE：
It is OLT according to the bandwidth that power system capacity is that ONU is reserved for fixed-bandwidth；
For guaranteed bandwidth, when the demand of ONU is more thanWhen, system can distribute band in the form of guaranteed bandwidth as its continuation Width, distribution the upper limit not overIf the ONU demands are less, remainder guaranteed bandwidth distributes to other ONU；
For excess bandwidth, it is the bandwidth for meeting ONU demand assignments outside fixed-bandwidth and guaranteed bandwidth to be；
WiFor the distribution weight of excess bandwidth,
C is the total capacity of PON system.
Further, the adjustment of load unit is specifically included：
Adjustment subelement, is used for：Under the maximum PON mouths of load, qualified ONU is chosen, if finding eligible ONU, the OUN is adjusted to load minimum PON mouths, update the mapping relations of ONU and PON mouths；If in the PON that load is maximum Under mouthful, do not find qualified, from secondary maximum PON mouths qualified ONU is found；Searching process continues, until time Go through all of PON mouths.
The present invention is compared with prior art：Bandwidth availability ratio can be improved while avoiding flow from conflicting, and meet use The differentiated demand at family, lifting Consumer's Experience.
Description of the drawings
Fig. 1 is the PON mouth load-balancing method embodiment principle schematics that the present invention supports the grade of service；
Fig. 2 is embodiment of the present invention SLA principle schematic；
Fig. 3 is embodiment of the present invention scene structure figure；
Fig. 4 realizes the principle schematic of wavelength tuning for prior art.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement Example is not limited to the scope of the present invention for illustrating the present invention.
Fig. 1 is the PON mouth load-balancing method embodiment principle schematics that the present invention supports the grade of service.It is described in Fig. 1 Method And Principle includes：
Step 1：Start a new cycle T；
Step 2：Count each ONU bandwidth on demand mean value
Step 3：According to SLA set in advance and bandwidth requestIt is calculated as bandwidth R of each ONU distributioni；
Step 4：According to the mapping relations of ONU and PON mouths, all ONU distribution bandwidths sums on each PON mouths are counted, i.e., should The load of PON mouths
Step 5：Choose target ONU；
Step 5-1：Calculating makes the optimal target ONU bandwidth value of load balancing effect, i.e. optimum optimization value α；
Step 5-2：A R is selected under load value L maximum PON mouthsiIt is worth the ONU closest to α；
Step 5-3：Judge the R of the ONU of selectioniWhether value is less than difference L for loading maxima and minimaMAX-LMINIf, It is, execution step 6；Otherwise judge whether that also PON mouths are not traveled through；
Step 5-4：If also PON mouths are not traveled through, a R is selected under the maximum PON mouths of load value whereiniValue most connects The ONU of nearly α, jumps to step 5-3；The otherwise end cycle；
Step 6：Using the ONU for choosing as target ONU, the mapping relations of ONU and PON mouths, execution step 4 are updated.
Following table is embodiment of the present invention parameter list：
Fig. 2 is embodiment of the present invention SLA principle schematic.In figure：
Fixed-bandwidth is OLT according to the bandwidth that power system capacity is that ONU is reserved；
Guaranteed bandwidth, when the demand of ONU is more than fixed-bandwidth, system can be distributed in the form of guaranteed bandwidth as its continuation Bandwidth, the distribution upper limit is not over guaranteed bandwidth；If the ONU demands are less, remainder guaranteed bandwidth distributes to other ONU；
Excess bandwidth, it is the bandwidth for meeting ONU demand assignments outside fixed-bandwidth and guaranteed bandwidth to be.
Fig. 3 is embodiment of the present invention scene structure figure, the i.e. PON system of tunable wave length, in order to simplify the calculating of algorithm Amount, the system arranges OLT and 9 ONU, and overall system capacity is 300Mbit/s.
There are four PON mouths in OLT to receive upward signal, output downstream signal；One DWBA (self-defined term, Dynamic wavelength and bandwidth allocation, dynamic wavelength bandwidth allocation) controller to be carrying out wavelength And bandwidth allocation；One luminous-power distributor connection PON mouth and correspondence PON branches；One multiplexing/demultiplexer.
Each PON mouth uses different uplink/downlink wavelength pair in the system；In multiplexing/demultiplexer polymerization multichannel Row signal is into core net or Metropolitan Area Network (MAN), while downstream signal is demultiplexed to each PON mouth according to destination address；ONU passes through The transceiver of one tunable wave length concurrently send upward signal receiving downstream signal, and each ONU can be according to DWBA controllers Instruction tune uplink/downlink wavelength so as to switch to other PON branches under.
DWBA controllers distribute ascending time slot within each DBA cycle for ONU.In view of extending to band during uplink Wide precise control, the DBA cycles are generally very short, much smaller than the DWA cycles.
DWBA controllers can be automatically obtained load balancing.When the load on DWBA monitoring control devices to each PON mouth not When balanced, algorithm proposed by the present invention can be passed through and choose one or more ONU under the maximum PON mouths of load, by tuning choosing In the wavelength of target ONU switch it to the minimum PON mouths of load.During this, if having carried out unnecessary wavelength Tuning, not only results in the flow interrupt of tuned ONU, can also affect the data is activation of other ONU.Therefore, DWBA controls Device will as far as possible reduce the quantity of wavelength tuning, it is to avoid unnecessary wavelength tuning.
Fig. 4 realizes the principle schematic of wavelength tuning for prior art.The wherein DWA cycles are made up of multiple DBA cycles , DWA calculates ONU the and PON mouth mapping relations for determining the next one DWA cycles.According to DWA result of calculations, OLT to ONU sends GATE frames, wherein initial time T comprising new wavelength and wavelength tuningλ；ONU is completed after wavelength tuning, is sent to OLT REPORT frames.
It is without admission control, i.e., without tuning is interrupted, all to adopt in ONU and OLT during realizing wavelength tuning in Fig. 4 With cache management mechanism.In up direction, ONU stops sending uplink data frames until wavelength tuning is completed, therefore, by Upstream data during a sufficiently large buffer memory is installed in ONU to store wavelength tuning is it is ensured that Frame will not be lost Lose.
To down direction, sufficiently large buffer memory is only installed in the olt and cannot be avoided admission control.It is first First, in TλBefore, it is necessary to which reserved time enough otherwise can be caused down emptying the Frame not sent on original PON mouths Row admission control；Secondly, for the PON mouths after redistributing, persistent cache downlink data frame to adjust until completing wavelength It is humorous.
Table a-m is embodiment of the present invention PON mouth load balancing adjustment process schematic.
Table a is embodiment initialization data, including initial ONU, PON mouth mapping relations, customer sla parameter and user Bandwidth request (it is assumed here that each ONU one user of lower connection).
Table a
Table b is the parameter in form a, and the bandwidth for each user's distribution obtained is (by guarantee bandwidth and excess band Width composition).
Table b
Table c is the distribution bandwidth value in table b, tries to achieve optimum optimization value, then is selected by optimum optimization value eligible Target ONU.
Table c
Table d is to be adjusted to target ONU chosen in table c to load after minimum PON, new PON mouths, ONU mapping relations.
Table d
Table e, according to mapping relations in d new target ONU is continually looked for.
Table e
Table f, continues to adjust target ONU.
Table f
Table g, continues to find target ONU under load maximum PON mouths, but does not search out qualified target ONU.
Table g
Table h, finds under secondary maximum PON mouths, finds qualified target ONU.
Table h
Table i, is adjusted to load minimum PON mouths to target ONU that table h is searched out.
Table i
Table j, continues to find target ONU under load maximum PON mouths, but does not search out qualified target ONU.
Table j
Table k, continues to find target ONU under load time maximum PON mouths, but does not search out qualified target ONU.
Table k
Table l, continually looks for target ONU, but does not search out qualified target ONU, and has traveled through all PON Mouthful.
Table l
Table m, the PON mouth load issues after the completion of whole load balancing adjustment.
Table m
Finally, the present processes are only preferably embodiment, are not intended to limit protection scope of the present invention.It is all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention Within the scope of.

Claims (9)

1. a kind of PON mouth load-balancing methods for supporting the grade of service, it is characterised in that methods described includes：
Step S1, counts each ONU bandwidth on demand mean value
Step S2, according to bandwidth on demand mean value and grade of service SLA parameter set in advance, is calculated as each ONU distribution Bandwidth Ri；
Step S3, according to the mapping relations of ONU and PON mouths, counts all ONU distribution bandwidths sums on each PON mouths
Step S4, choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths.
2. the PON mouth load-balancing methods of the grade of service are supported as claimed in claim 1, it is characterised in that step S1, Count each ONU bandwidth on demand mean valueSpecially：
One dynamic wavelength assignment DWA cycle includes multiple Dynamic Bandwidth Allocation DBA cycles；
Each ONU reports bandwidth request within each DBA cycle；
Within a DWA cycle, the mean value of the bandwidth request in multiple DBA cycles is calculated, obtain each ONU bandwidth on demand average Value
3. the PON mouth load-balancing methods of the grade of service are supported as claimed in claim 1, it is characterised in that step S2, According to bandwidth on demand mean value and grade of service SLA parameter set in advance, bandwidth R of each ONU distribution is calculated asi, specifically For：
Calculate the guarantee bandwidth of each OUN
Calculate the excess bandwidth of each ONU
To ensureing that bandwidth is sued for peace with excess bandwidth, the bandwidth for each ONU distribution is obtained
R i = R C i + R E i
4. the PON mouth load-balancing methods of the grade of service are supported as claimed in claim 3, it is characterised in that the guarantee band Wide, the concrete calculating of excess bandwidth includes：
Ensure bandwidth
R C i = m i n { R F i + R A i ; m a x { R F i ; R L i } }
By the excess bandwidth that weight is each ONU distribution
R E i = S E × W i
Excess bandwidth total amount SE：
S E = C - Σ i m i n { R F i + R A i ; m a x { R F i ; R L i } }
It is OLT according to the bandwidth that power system capacity is that ONU is reserved for fixed-bandwidth；
For guaranteed bandwidth, when the demand of ONU is more thanWhen, system can continue distribution bandwidth in the form of guaranteed bandwidth as it, Distribution the upper limit not overIf the ONU demands are less, remainder guaranteed bandwidth distributes to other ONU；
For excess bandwidth, it is the bandwidth for meeting ONU demand assignments outside fixed-bandwidth and guaranteed bandwidth to be；
WiFor the distribution weight of excess bandwidth,
C is the total capacity of PON system.
5. the PON mouth load-balancing methods of the grade of service are supported as claimed in claim 1, it is characterised in that step S4, Choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths, specifically includes：
Under the maximum PON mouths of load, qualified ONU is chosen, if finding qualified ONU, the OUN is adjusted to bear Minimum PON mouths are carried, the mapping relations of ONU and PON mouths are updated；If under the maximum PON mouths of load, not finding eligible , find qualified ONU from secondary maximum PON mouths；Searching process continues, until traveling through all of PON mouths.
6. a kind of PON mouth load balancing apparatus for supporting the grade of service, it is characterised in that described device includes：
Bandwidth on demand computing unit, counts each ONU bandwidth on demand mean value
Distribution bandwidth processing unit, according to bandwidth on demand mean value and grade of service SLA parameter set in advance, is calculated as each Bandwidth R of ONU distributioni；
Statistics sum unit, according to the mapping relations of ONU and PON mouths, counts all ONU distribution bandwidths sums on each PON mouths
Adjustment of load unit, choosing needs target ONU of adjustment, and target OUN is adjusted to into suitable PON mouths.
7. the PON mouth load balancing apparatus of the grade of service are supported as claimed in claim 6, it is characterised in that the bandwidth on demand Computing unit is specifically included：
Bandwidth request reports subelement, for reporting bandwidth request within each DBA cycle for each ONU；
Average bandwidth computation subunit, within a DWA cycle, calculating the mean value of the bandwidth request in multiple DBA cycles, Obtain each ONU bandwidth on demand mean valueWherein, dynamic wavelength assignment DWA cycle include multiple Dynamic Bandwidth Allocations The DBA cycles.
8. the PON mouth load balancing apparatus of the grade of service are supported as claimed in claim 6, it is characterised in that the distribution bandwidth Processing unit is specifically included：
Ensure bandwidth calculation subelement, for calculating the guarantee bandwidth of each OUN
Excess bandwidth subelement, for calculating the excess bandwidth of each ONU
Distribution bandwidth computation subunit, for ensureing that bandwidth is sued for peace with excess bandwidth, obtaining the bandwidth for each ONU distribution
Wherein,
Ensure bandwidth
R C i = m i n { R F i + R A i ; m a x { R F i ; R L i } }
By the excess bandwidth that weight is each ONU distribution
R E i = S E × W i
Excess bandwidth total amount SE：
S E = C - Σ i m i n { R F i + R A i ; m a x { R F i ; R L i } }
It is OLT according to the bandwidth that power system capacity is that ONU is reserved for fixed-bandwidth；
For guaranteed bandwidth, when the demand of ONU is more thanWhen, system can continue distribution bandwidth in the form of guaranteed bandwidth as it, Distribution the upper limit not overIf the ONU demands are less, remainder guaranteed bandwidth distributes to other ONU；
For excess bandwidth, it is the bandwidth for meeting ONU demand assignments outside fixed-bandwidth and guaranteed bandwidth to be；
WiFor the distribution weight of excess bandwidth,
C is the total capacity of PON system.
9. the PON mouth load balancing apparatus of the grade of service are supported as claimed in claim 6, it is characterised in that the adjustment of load Unit is specifically included：
Adjustment subelement, is used for：Under the maximum PON mouths of load, qualified ONU is chosen, if finding qualified ONU, the OUN is adjusted to load minimum PON mouths, updates the mapping relations of ONU and PON mouths；If in the PON mouths that load is maximum Under, do not find qualified, find qualified ONU from secondary maximum PON mouths；Searching process continues, until traversal All of PON mouths.
CN201611069734.0A 2016-11-25 2016-11-25 PON port load balancing method and device supporting SLA (Service Level Agreement) Pending CN106656844A (en)

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Cited By (1)

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Application publication date: 20170510