CN107147592A - Elastic optical network intermediate frequency spectrum resource allocation methods - Google Patents
Elastic optical network intermediate frequency spectrum resource allocation methods Download PDFInfo
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- CN107147592A CN107147592A CN201710316243.XA CN201710316243A CN107147592A CN 107147592 A CN107147592 A CN 107147592A CN 201710316243 A CN201710316243 A CN 201710316243A CN 107147592 A CN107147592 A CN 107147592A
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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
- H04L47/70—Admission control; Resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/122—Shortest path evaluation by minimising distances, e.g. by selecting a route with minimum of number of hops
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of elastic optical network intermediate frequency spectrum resource allocation methods, comprise the following steps：S1, judge the whether successful S2 of resource fragmentation, calculate the resource size NBS for giving different classes of businessi, all frequency spectrum resources are divided into correspondence to different classes of business wavelength coverage, wavelength coverage has NBS respectivelyiIndividual band sipes；S3, calculating sharing module bandwidth slot number amount NSBS, and unappropriated NSBS band sipes is arranged to sharing module；S4, acquisition business essential information, find the wavelength coverage that all links in link set distribute to the business；S5, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages, if it is distribute first available resource block to the business；S6, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in sharing module；The present invention can effectively improve network fairness parameter, reduction blocking rate damage.
Description
Technical field
The present invention relates to technical field of optical network communication, and in particular to elastic optical network intermediate frequency spectrum resource allocation methods.
Background technology
In order to make up the deficiency of conventional optical network intermediate frequency spectrum utilization rate and bandwidth flexibility, the Japan of in September, 2008 carries first
The concept of frequency spectrum section elastic optical network is gone out, the extensive concern of researcher has been received rapidly, the frequency spectrum to optical-fiber network is flexibly asked
The key to exercises certainly provides a kind of important thinking；At the same time, Europe and the U.S. it is also proposed similar concept, such as elastic optical network
(Elastic Optical Network, EO-Net), flexible wavelength division multiplexed network (Flexible Wavelength
Division Multiplexing, FWDM) etc.；Based on OFDM (Orthogonal Frequency Division
Multiplexing, OFDM) the flexible optical-fiber network technology of frequency spectrum, network can be used flexibly reasonably to be distributed according to business demand
Frequency spectrum resource, and suitable modulation format is selected according to information such as physical damnifications, it is the further transmission rate for improving optical-fiber network
New possibility is provided with efficiency.
In the research field of elastic optical network, route is particularly important with frequency spectrum resource allocation method；Method is not
Network blocking probability can be intuitively influenceed with selection, the network performance such as resource utilization；Need to follow following two in the design of method
Individual restrictive condition：1) frequency spectrum uniformity, after light path is set up, the bandwidth of the occupancy in each of the links is same position；2) bandwidth
Resource continuity, the frequency spectrum resource that each business takes is continuous；Due to the limitation of these conditions, in traditional elastic optical net
In network, the initial hit algorithm typically used distributes frequency spectrum resource for different business, and this can cause low rate traffic (required frequency band
Number is few) it is easier to be assigned to continuous idle frequency band than high-rate service (required frequency gap number is more), cause the obstruction of Low-rate traffic
Rate is much smaller than the blocking rate of high speed business.
OFDM (OFDM) is a kind of special multi-carrier modulation technology, different from general multi-carrier modulation technology
, the subcarrier that OFDM is used is mutually orthogonal；In actual applications, ofdm signal is except effective subcarrier-modulated mould
Beyond block, many other parts are further comprises；Relatively common system block diagram is as shown in Figure 1；The system is ofdm signal
The basic structure of transmitter and receiver；The main function for adding pilot tone is to be used for phase correction；Without prior information when
Wait, pilot tone can be for progress channel estimation；It can judge which place is opening for symbol period during demodulation by pilot tone
Begin；In systems, signal timing is caused by multipath channel by introducing cyclic prefix (Cyclic Prefix, CP), its each
Orthogonality between subchannel remains to access perfect holding；CP way is exactly to copy to the last part of OFDM symbol
The front end of each code element, and CP length must be greater than the decay time length of channel；This ofdm signal for making to be transmitted
Show periodically, CP is to eliminating intersymbol interference and keeping the orthogonality between subcarrier to play critical effect；In addition, CP
As a kind of protection interval, actually it is a kind of redundancy relative to initial data, it is also desirable to take certain extra frequency
Spectrum and power resource, but ofdm system is exactly based on this part of frequency spectrum resource of sacrifice to realize the complexity of reduction system
Degree.
The content of the invention
The present invention provides a kind of elastic optical network intermediate frequency spectrum money for improving network fairness and being damaged with relatively low blocking rate
Source distribution method.
The technical solution adopted by the present invention is：A kind of elastic optical network intermediate frequency spectrum resource allocation methods, comprise the following steps：
S1, judge whether resource fragmentation succeeds, be if it is transferred to step S4, step S2 is transferred to if not；
S2, calculating give the resource size NBS of different classes of businessi, all frequency spectrum resources are divided into correspondence to inhomogeneity
Various-service wavelength coverage, wavelength coverage has NBS respectivelyiIndividual band sipes；
S3, calculating sharing module bandwidth slot number amount NSBS, and unappropriated NSBS band sipes is arranged to sharing module,
Resource fragmentation succeeds and is transferred to step S4；
S4, acquisition business essential information, find the wavelength coverage that all links in link set distribute to the business；
S5, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages, if
It is then to distribute first available resource block to the business, business is disposed successfully, if being otherwise transferred to step S6；
S6, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in sharing module, if
First available resource block is then distributed to the business, business is disposed successfully, if otherwise business is blocked.
Further, in the step S2 business resource size NBSiComputational methods such as following formula：
In formula：B is each of the links bandwidth slot number, and i is the sub-carrier number of service request, is 1 to the integer between N；Request
Bandwidth slot number be i business occur probability be Pi。
Further, sharing module bandwidth slot number amount NSBS computational methods such as following formula in the step S3：
Further, judge whether there is the assignable service request bandwidth slot number in these wavelength coverages in the step S5
I continuous band sipes, it is if it is further comprising the steps of：
Fragmentation index FD in path in the resource block of selection is calculated, distribution causes path FD least resources block to the business.
Further, the fragmentation index calculation method is as follows：
In formula：B is the bandwidth slot number on link altogether, and MaxPass is the maximum traffic granularity that can pass through,
FreeBlock is available band sipes sum on link.
The beneficial effects of the invention are as follows：
(1) present invention solves the problems, such as the service fairness between the obstructed granularity service of variable bandwidth optical network；
(2) present invention refines spectrum fragmentation, with reference to the method for frequency spectrum fragment reduction, improves network fairness, blocks
Damage ratio is relatively low.
Brief description of the drawings
Fig. 1 is existing orthogonal frequency division multiplex OFDM system block diagram.
Fig. 2 is the flowage structure schematic diagram in embodiment 1.
Fig. 3 is the flowage structure schematic diagram in embodiment 2.
Fig. 4 is the link schematic diagram in embodiment 3.
Fig. 5 is that business reaches blocking rate simulation result figure when probability obeys standardized normal distribution.
Fig. 6 is that business reaches business fairness coefficient FI simulation result figures when probability obeys standardized normal distribution.
Fig. 7 is that business reaches blocking rate simulation result figure when obedience is uniformly distributed.
Fig. 8 is that business reaches business fairness coefficient FI simulated effect figures when obedience is uniformly distributed.
Embodiment
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Fig. 2 a kind of elastic optical network intermediate frequency spectrum resource allocation methods, following methods are to be perceived based on fairness
Frequency spectrum resource allocation method, abbreviation AFA, comprises the following steps：
S1, judge whether resource fragmentation succeeds, be if it is transferred to step S4, step S2 is transferred to if not；
S2, calculating give the resource size NBS of different classes of businessi, all frequency spectrum resources are divided into correspondence to inhomogeneity
Various-service wavelength coverage, wavelength coverage has NBS respectivelyiIndividual band sipes；The resource size NBS of businessiComputational methods such as following formula：
In formula：B is each of the links bandwidth slot number, and i is the sub-carrier number of service request, is 1 to the integer between N；For
Set of paths of the business from the process source node s to destination node d；
Calculate service resources sizes be to business i (bandwidth on demand slot number i) traffic assignments sub-carrier number when, set up net
Network physical topology non-directed graph G { V, E, B }, wherein V are the node set in network, and E is link set；Assuming that spectrum unit is most
Small grain size is a band sipes (BS)；Service request C { i, Ps-d, expression is built from source node s ∈ V to destination node d ∈ V
Vertical Operational Visit；Assuming that the probability that the business that the bandwidth slot number of request is i occurs is Pi；
S3, calculating sharing module bandwidth slot number amount NSBS, and unappropriated NSBS band sipes is arranged to sharing module,
Resource fragmentation succeeds and is transferred to step S4；Sharing module bandwidth slot number amount NSBS computational methods such as following formula：
S4, acquisition business essential information, find the wavelength coverage that all links in link set distribute to the business；Such as new industry
Be engaged in C { i, Ps-d, obtaining business essential information includes wavelength coverage classification i, bandwidth on demand slot number i, s-d link set；
S5, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages, if
It is then to distribute first available resource block (i continuously available band sipes in wavelength coverage) to the business, business is disposed successfully, if
Otherwise it is transferred to step S6；
S6, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in sharing module, if
First available resource block (i continuously available band sipes in wavelength coverage) is then distributed to the business, business is disposed successfully, if not
Then business is blocked.
Embodiment 2
As shown in figure 3, a kind of elastic optical network intermediate frequency spectrum resource allocation methods, following methods are referred to as perceived based on fairness
With the dynamic resource allocation method of fragment reduction, abbreviation FAFR comprises the following steps：
S1, judge whether resource fragmentation succeeds, be if it is transferred to step S4, step S2 is transferred to if not；
S2, calculating give the resource size NBS of different classes of businessi, all frequency spectrum resources are divided into correspondence to inhomogeneity
Various-service wavelength coverage, wavelength coverage has NBS respectivelyiIndividual band sipes；The resource size NBS of businessiComputational methods such as following formula：
In formula：B is each of the links bandwidth slot number, and i is the sub-carrier number of service request, is 1 to the integer between N；For
Set of paths of the business from the process source node s to destination node d；
Calculate service resources sizes be to business i (bandwidth on demand slot number i) traffic assignments sub-carrier number when, set up net
Network physical topology non-directed graph G { V, E, B }, wherein V are the node set in network, and E is link set；Assuming that spectrum unit is most
Small grain size is a band sipes (BS)；Service request C { i, Ps-d, expression is built from source node s ∈ V to destination node d ∈ V
Vertical Operational Visit；Assuming that the probability that the business that the bandwidth slot number of request is i occurs is Pi；
S3, calculating sharing module bandwidth slot number amount NSBS, and unappropriated NSBS band sipes is arranged to sharing module,
Resource fragmentation succeeds and is transferred to step S4；Sharing module bandwidth slot number amount NSBS computational methods such as following formula：
S4, acquisition business essential information, find the wavelength coverage that all links in link set distribute to the business；Such as new industry
Be engaged in C { i, Ps-d, obtaining business essential information includes wavelength coverage classification i, bandwidth on demand slot number i, s-d link set；
S5, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages, if
It is path fragmentation index FD in the resource block (i continuously available band sipes in wavelength coverage) for calculate selection, distribution causes road
Footpath FD least resources block (i continuously available band sipes in wavelength coverage) gives the business, and business is disposed successfully, if being otherwise transferred to step
Rapid S6；
Fragmentation index calculation method is as follows：
In formula：B is the bandwidth slot number on link altogether, and MaxPass is the maximum traffic granularity that can pass through,
FreeBlock is available band sipes sum on link；
In order to ensure on the premise of fairness is improved, network entirety blocking rate is impacted smaller, is avoided using fragment
Method；Frequency spectrum fragment be due to bandwidth resources continuity limitation, the subcarrier distributed on a light must be it is continuous and
Can not be discrete；This can allow some available continuous frequency spectrum blocks to be divided and come, and form fragment；Fragmentation index be 0-1 it
Between number, fragmentation index is closer to 1, and degree of fragmentation is higher；
S6, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in sharing module, if
First available resource block (i continuously available band sipes in wavelength coverage) is then distributed to the business, business is disposed successfully, if not
Then business is blocked.
Using OPNET softwares, simulating, verifying is carried out to scheme using 14 node NSFNet networks；For any one business
Linking request is reached, and source node and destination node equiprobability are selected；Poisson distribution is obeyed at business arrival time interval, and business is held
The continuous time obeys quantum condition entropy, and emulation is using fixed shortest route；A total of ten kinds of business in network, bandwidth on demand slot number 1
To 10；Simulate blocking rate BP in the case of ten kinds of business probabilities of occurrence obey standardized normal distributions and be equally distributed two kinds and
Fairness coefficient FI；Business reaches probability and just refers to the probability that all kinds of business are reached, and all kinds of business are meant that if being uniformly distributed
What is reached is in equal proportions；Its result is as viewed in figures 5-8；In order to weigh the service fairness between different business, business is introduced public
Levelling coefficient：
Wherein：N is the species of business in network, and Pi is the service blocking rate for asking granularity to be i, and FI is the number between 0-1,
When FI is closer to 1, the blocking rate of all kinds of business is closer to then the fairness of network is better.
Method it can be seen from Fig. 5-8 in embodiment 1 and embodiment 2 is relative to existing initial hit FF calculating sides
Method can greatly improve network fairness index, but the blocking rate damage that FAFR methods are brought is smaller；FAFR methods can band
Carry out certain fairness damage, be primarily due to fragment and avoid the income brought during selection to big business bigger than small business, institute
Small business is higher than with the reduction for big service blocking rate, its fairness is slightly not so good as compared with AFA methods；Both approaches
To greatly improve the fairness index of network, and there is less blocking rate to damage.
Embodiment 3
Illustrate the effect of the inventive method below by specific embodiment.
A total of 10 class business in network system, i.e. N=10, bandwidth on demand slot number i is respectively 1,2 ... ..., and 10；Business
Arrival is distributed as being uniformly distributed, i.e., reach probability P per class businessiEqual is 10%；Link bandwidth groove sum B is 600, this
It is total frequency spectrum resource；According to segmentation formula：
Calculate distribute to every class business bandwidth slot number it is as shown in table 1：
Every class service bandwidth slot number that table 1. is calculated
According to formula：
Show that bandwidth slot number is 5 in sharing module, it is assumed that business 2 is reached, and approach link is：Link 1, link 2 and chain
Road 3；
Three links and path bandwidth groove service condition are as follows：In order to more preferably illustrate, it is assumed here that distribute to the frequency of business 2
Spectral coverage is 12；Distributing the business as seen from Figure 4 has three kinds of selections, respectively selects 1, selection 2 and selection 3.
AFA methods directly take selection 1.
FAFR methods can calculate the path degree of fragmentation after three kinds of selections, and selection causes path degree of fragmentation minimum
The method of salary distribution；
Degree of fragmentation FD is adopted to be calculated with the following method：
By calculating：
Selection 1：FD_Path1-3=1-2/4=1/2；
Selection 2：FD_Path1-3=1-2/4=1/2；
Selection 3：FD_Path1-3=1-3/4=1/4.
The source node that above-mentioned degree of fragmentation is calculated by Dijkstra shortest path firsts passes through between destination node
All resources of link integration, it is known that business needs, by which link, to distribute these from source node to destination node
Resource on link ensures the transmission of business.
Dijkstra's algorithm is typical signal source shortest path algorithm, for calculating a node to other all nodes
Shortest path.It is mainly characterized by centered on starting point outwards extending layer by layer, untill expanding to terminal.
It can be drawn by above-mentioned calculating and selection 3 is taken if using FAFR methods, allocate resources to business 2.
Because the continuity that elastic optical network has frequency spectrum direction is limited, cause do not taking the situation of specific aim measure
Under, big granularity service (i.e. demand bandwidth ratio is larger, the more business of required distributing carrier wave) is than small grain size business (i.e. demand band
Wide smaller, the fewer business of required distributing carrier wave) it is easily blocked, moreover, the gap of granularity is bigger, different grain size
Between this blocking performance difference it is also bigger；This is that variable bandwidth optical network needs the new service fairness solved to ask
Topic, i.e. service fairness problem between different grain size business；The present invention is exactly directed to this problem, by the method for spectrum fragmentation
Refinement, is combined with the method for frequency spectrum fragment reduction, effectively improves network fairness parameter, and have relatively low blocking rate damage.
Claims (5)
1. a kind of elastic optical network intermediate frequency spectrum resource allocation methods, it is characterised in that comprise the following steps：
S1, judge whether resource fragmentation succeeds, be if it is transferred to step S4, step S2 is transferred to if not；
S2, calculating give the resource size NBS of different classes of businessi, all frequency spectrum resources are divided into correspondence to different classes of business
Wavelength coverage, wavelength coverage has NBS respectivelyiIndividual band sipes；
S3, calculating sharing module bandwidth slot number amount NSBS, and unappropriated NSBS band sipes is arranged to sharing module, resource
It is segmented successfully and is transferred to step S4；
S4, acquisition business essential information, find the wavelength coverage that all links in link set distribute to the business；
S5, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages, if it is
First available resource block of distribution gives the business, and business is disposed successfully, if being otherwise transferred to step S6；
S6, judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in sharing module, if it is divide
The business is given with first available resource block, business is disposed successfully, if otherwise business is blocked.
2. a kind of elastic optical network intermediate frequency spectrum resource allocation methods according to claim 1, it is characterised in that the step
The resource size NBS of business in S2iComputational methods such as following formula：
<mrow>
<msub>
<mi>NBS</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mi>c</mi>
<mi>e</mi>
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<mrow>
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<msub>
<mi>ip</mi>
<mi>i</mi>
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<mi>B</mi>
</mrow>
<mrow>
<munderover>
<mi>&Sigma;</mi>
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<mo>=</mo>
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<msub>
<mi>np</mi>
<mi>n</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
In formula：B is each of the links bandwidth slot number, and i is the sub-carrier number of service request, is 1 to the integer between N；The band of request
The probability that the business that sipes number is i occurs is Pi。
3. a kind of elastic optical network intermediate frequency spectrum resource allocation methods according to claim 2, it is characterised in that the step
Sharing module bandwidth slot number amount NSBS computational methods such as following formula in S3：
<mrow>
<mi>N</mi>
<mi>S</mi>
<mi>B</mi>
<mi>S</mi>
<mo>=</mo>
<mi>B</mi>
<mo>-</mo>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>NBS</mi>
<mi>i</mi>
</msub>
<mo>.</mo>
</mrow>
4. a kind of elastic optical network intermediate frequency spectrum resource allocation methods according to claim 1, it is characterised in that the step
Judge whether there be the assignable i continuous band sipes of service request bandwidth slot number in these wavelength coverages in S5, if it is also
Comprise the following steps：
Fragmentation index FD in path in the resource block of selection is calculated, distribution causes path FD least resources block to the business.
5. a kind of elastic optical network intermediate frequency spectrum resource allocation methods according to claim 4, it is characterised in that the fragment
Change index calculation method as follows：
<mrow>
<mi>F</mi>
<mi>D</mi>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
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<mo>-</mo>
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<mrow>
<mi>M</mi>
<mi>a</mi>
<mi>x</mi>
<mi>P</mi>
<mi>a</mi>
<mi>s</mi>
<mi>s</mi>
</mrow>
<mrow>
<mi>F</mi>
<mi>r</mi>
<mi>e</mi>
<mi>e</mi>
<mi>B</mi>
<mi>l</mi>
<mi>o</mi>
<mi>c</mi>
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</mrow>
</mfrac>
<mo>,</mo>
<mi>F</mi>
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<mo>&le;</mo>
<mi>B</mi>
</mrow>
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</mtr>
<mtr>
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</mtable>
</mfenced>
</mrow>
In formula：B is the bandwidth slot number on link altogether, and MaxPass is the maximum traffic granularity that can pass through, and FreeBlock is
Available band sipes sum on link.
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| CN110708616A (en) * | 2018-07-10 | 2020-01-17 | 中兴通讯股份有限公司 | Spectrum allocation method, device and computer storage medium for optical network |
| CN110708616B (en) * | 2018-07-10 | 2022-04-29 | 中兴通讯股份有限公司 | Spectrum allocation method, device and computer storage medium for optical network |
| CN109905172A (en) * | 2019-03-21 | 2019-06-18 | 中原工学院 | A kind of frequency spectrum distributing method of minimum adjacent degree reduction amount in elastic optical network |
| CN109905172B (en) * | 2019-03-21 | 2021-08-20 | 中原工学院 | Frequency spectrum allocation method for minimizing adjacency reduction in elastic optical network |
| CN111182379A (en) * | 2020-01-03 | 2020-05-19 | 中原工学院 | Frequency spectrum allocation method for plastic reserved service in elastic optical network |
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