CN108833142A - A kind of network plan method of multi-core optical fiber planning business - Google Patents
A kind of network plan method of multi-core optical fiber planning business Download PDFInfo
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- CN108833142A CN108833142A CN201810522958.5A CN201810522958A CN108833142A CN 108833142 A CN108833142 A CN 108833142A CN 201810522958 A CN201810522958 A CN 201810522958A CN 108833142 A CN108833142 A CN 108833142A
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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
- H04L41/14—Network analysis or design
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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
- H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
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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
Abstract
The invention discloses a kind of network plan methods of multi-core optical fiber planning business, in a series of given planning business, it is assumed that the path of each planning business is fixed, the shortest route between source node and destination node；The light core and frequency spectrum found out and be suitble to distribution on planning business path in each of the links are calculated, and selects most suitable settling time and release time, to reduce the crosstalk factor between time-weighted smooth core.Present invention employs the plan optical path algorithms based on RCSA, and crosstalk between light core is effectively reduced while meeting planning business demand, optimize the network planning of planning business transmission.
Description
Technical field
The present invention relates to a kind of network plan method, specially a kind of network plan method of multi-core optical fiber planning business.
Background technique
With the rapid development of Internet application, network flow exponentially increases, and the demand to network bandwidth also exists
Very fast growth.Nowadays, the network architecture based on single single mode optical fiber has tended to be saturated to the offer of bandwidth, researcher's exhibition
It opens to space division multiplexing network（SDM）Research, wherein multi-core optical fiber（MCF）It is to develop quick and very promising one kind.So
And crosstalk is always that multi-core optical fiber develops maximum obstruction between light core.Currently, have multiple studies have shown that, between adjacent smooth core
Crosstalk will affect the transmitting of its signal between light core.Meanwhile it studying currently based on the SDM of MCF all around static traffic and dynamic
Business expansion.However, in real life, client usually has some planning business, planning business, which refers to determine in advance, is built
Between immediately and the business of release time.However, actually rare for the research of crosstalk between the light core of planning business.
Therefore, it is necessary to a kind of new technical solutions to solve above-mentioned technical problem.
Summary of the invention
The present invention provides a kind of network plan method of multi-core optical fiber planning business, i.e., interior non-conterminous by same time
Light core carry out business transmission, can substantially reduce crosstalk between light core again while meeting business demand in this way.
To achieve the above object, the present invention provides the following technical solutions：
A kind of network plan method of multi-core optical fiber planning business carries out business biography between non-conterminous smooth core in the same time
It is defeated, the crosstalk factor between light core is reduced while to meet planning business demand.I.e. in a series of given planning business, it is assumed that
The path of each planning business is fixed, the shortest route between source node and destination node；Planning business is found out in calculating
It is suitble to the light core and frequency spectrum of distribution on path in each of the links, and selects most suitable settling time and release time, reduces
The crosstalk factor between time-weighted smooth core.
Since each planning business has the earliest settling time and release time the latest of oneself, it would be desirable to it when
Between inside section selection be most suitable for its time window, and most suitable spectral window is distributed, to obtain minimum time-weighted light
The crosstalk factor between core.
Assuming that a fixed route between given source node and destination node, based on establishing one to each usable spectrum window
A auxiliary figure is for selecting light core and frequency spectrum with the crosstalk factor between minimum time-weighted smooth core.Schemed based on auxiliary, it is right
Multi-core optical fiber under current routing, needs to calculate whether each light core can be used current spectral window, for current frequency
The not available smooth core of window is composed, corresponding secondary link will not be established in auxiliary figure, and to those available smooth cores, scheme in auxiliary
In establish its corresponding secondary link, and the value at cost of its link is established as crosstalk factor values between light core, and utilize formula（2）
The crosstalk factor between the time-weighted smooth core of available light core is calculated,
（2）,
Wherein,What is indicated is time slot sets, andThen indicate the light core in time slot tWithTime-frequency spectrum weight is occupied by optical path
Folded sum,Indicate light core crosstalk weighted value,Respectively represent the serial number of light core.
Schemed based on auxiliary, can be selected so that crosstalk factor values between time-weighted smooth coreThe smallest spectral window and when
Between window, still, different spectral windows and time window group credit union obtain crosstalk factor values between different time weight light core, for
Such case, there are two types of strategies, i.e. initial hit strategy and cost minimization strategy, the former is using firstFrequency
Window and time window combination are composed to establish optical channel and distribute time slot and frequency band, the latter is all combinations of scanning, is chosen to
This it is the smallest that, i.e.,, according to the link that path is passed through, judge the light used
Core, to establish the optical path of current business.
Present invention employs the plan optical path algorithms based on RCSA, effectively reduce while meeting planning business demand
Crosstalk between light core optimizes the network planning of planning business transmission.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
In the accompanying drawings：
Fig. 1 is the MCF schematic diagram of 19 cores.
Fig. 2 is crosstalk factor calculating schematic diagram between light core.
Fig. 3 is that building auxiliary diagram is intended to.
Fig. 4 is the simulation result schematic diagram using the NSFNET network of 7 core MCF.
Fig. 5 is result schematic diagram as the COST239 network class of 19 core MCF.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Level of cross talk:For the adjacent characteristic of difference between light core in MCF, we define crosstalk between light core different
Grade.Fig. 1 is the MCF example of 19 cores, and in such light core layout, we define crosstalk between the light core of 3 grades.First
Grade indicates that between the light core 1 and light core 2 of direct neighbor, the light core of this direct neighbor has signal at the same time in figure with L1
Crosstalk between most strong light core can be generated when transmission.Second grade is indicated with L2 in figure, between light core 1 and light core 14,
As can be seen from the figure the light core being wherein spaced containing 1, the L1 distance of the light core of this indirect neighbor compared to direct neighbor
It is farther, there is crosstalk between the light core generated when signal transmission also can be weaker than L1 at the same time.Finally, for crosstalk between the third light core
L3, between light core 11 and light core 17, wherein having more than 1 or more interval light core, it is clear that between light core in this case
Crosstalk is most weak.Here it usesIndicate light core crosstalk weighted value, whereinRespectively represent the serial number of light core, the first estate
Light core between crosstalk obviously possess highest weighted factor, 100 are set as in this example, similarly, second and the tertiary gradient set respectively
For 10 and 1.
The crosstalk factor between light core:When the same frequency spectrum for core of not sharing the same light is occupied simultaneously, crosstalk between light core can be generated.Cause
This, in addition to for the adjacency between core of not sharing the same light, we are also contemplated that how many spectrum overlapping between two light cores.Such as
The fruit two light cores being currently being used do not have spectrum overlapping, are between no light core existing for crosstalk.Based on this spectrum overlapping, I
The crosstalk factor between light core is defined as
| (1) |
Wherein,Indicate light coreWithFrequency band (FSs) sum occupied by optical path overlapping.
Fig. 2 illustrates the example calculated about the crosstalk factor between light core.In light core 1, have two by the frequency band of optical path
Section, respectively from 1 to 3 and from 4 to 28.In light core 2, the frequency band occupied by optical path is 2 to 4.It is heavy for the two light cores
Folded frequency band sum is 2FSs, that is,, according to the defined formula of the crosstalk factor between light core, here it can be concluded thatSimilarly, the crosstalk factor between the light core between light core 1 and light core 8 can be calculated, the crosstalk factor is between light core 8 and the light core of light core 14。
The crosstalk factor between time-weighted smooth core：The condition that crosstalk generates between light core mentioned above must be in two optical paths
When existing simultaneously and having spectrum overlapping, longer when two optical path simultaneous times, crosstalk also can be more between the light core of generation.
Accordingly, it is considered to arrive time factor, it would be desirable to be further defined between crosstalk light core：
| (2) |
HereWhat is indicated is time slot sets, andThen indicate the light core in time slot tWithTime-frequency spectrum weight is occupied by optical path
Folded sum.
Heuritic approach：A series of plan optical services are given, are defined as[3], wherein
The source node and destination node of expression business,It time that expression business can establish earliest and needs to discharge the latest
Time, andThen indicate the duration of business,The FSs that business needs.In this example, it will be assumed that the road of each business
Diameter is fixed, is two o'clock（Source node and destination node）Between shortest route.For each industry for specifically needing xFSs
Business, it would be desirable to find the light core and frequency spectrum for being suitble to distribution on its path in each of the links, and select most suitable settling time
And release time.Since each planning business has the earliest settling time and release time the latest of oneself, it would be desirable at him
Time interval inside selection be most suitable for its time window (TW), and distribute most suitable spectral window (SW) to obtain minimum light
Crosstalk between core.For the selection of this TW and SW, we have developed a kind of heuritic approaches based on auxiliary figure.
Heuritic approach based on auxiliary figure:
We provide the example of auxiliary figure foundation below, it is assumed that a fixed road between given source node and destination node
By, and be assigned a specific SW and established for optical path, minimum time-weighted smooth core can be selected by establishing one based on this
Between the crosstalk factor new auxiliary topology.
For currently routing down each MCF, we firstly the need of calculate each of which light core for current SW whether
It can use, if it is available, we use formula 2 to calculate the crosstalk factor between its time-weighted smooth core.
In Fig. 3（a）In, it is assumed that current SW is from 1 to 4, we are labelled with the light core of specific each smooth core in figure
Service condition, for link Ns-N1, wherein the frequency band of light core 1 is occupied from 1 to 3 by other business, the light core 2 of link N1-Nd
The frequency band of current spectral window is all occupied.For Fig. 3（a）Network utilization power, we establish auxiliary as Fig. 3 (b)
Help figure topological, firstly for the not available smooth core of current spectral window（The light core 1 of link Ns-N1 and the light core 2 of link N1-Nd）,
Corresponding secondary link will not be established in auxiliary figure.And to those available smooth cores, we establish its correspondence in auxiliary figure
Secondary link, and the value at cost of its link is established as crosstalk factor values between the light core calculated with formula 1.For example, light
The frequency band 1 to 3 of core 1 is occupied, and the adjacent rank of light core 2 and light core 1 belongs to the first estate, then, it is possible to it counts
It obtains, then the cost of secondary link s-D0--N1-D0 is 300.Correspondingly, the value of all secondary links is all
It can calculate in this way, we have been labeled in respectively beside link.It is topological based on newly-established auxiliary figure in this way,
We find out the path of a cost minimization between source node s-S and destination node d-D using minimum cost routing algorithm again,
According to the link that path is passed through, the light core used is judged, to establish the optical path of current business.
SW and TW selection strategy:Based on the auxiliary figure created above, we can select so that time-weighted light
Crosstalk factor values between coreThe smallest SW and TW.But different SW and TW group credit unions obtains different time weight
Crosstalk factor values between light core, in this case, we consider two kinds of strategies, i.e. initial hit strategy and cost minimization plan
Slightly.The former is using firstSW and TW combine to establish optical channel and distribute time slot and frequency band,
The latter is all combination of scanning, select cost it is the smallest that, i.e.,。
Emulation and interpretation of result：We are with 11 nodes, the COST239 network and 14 nodes of 26 links, 21 links
NSFNET network has carried out result emulation to the network planning strategy of proposition.Core smooth for each of every MCF, has 320FSs can
With distributing as traditional elastic optical network the frequency spectrum of each optical channel.In emulation, the bandwidth of planning business is 5 to 20
Random distribution between FSs, here, frequency gap number are determined by the practical loan of business and its modulation format selected.Except this with
We produce a series of planning business immediately between slot section [0,260] outside, and the duration of business is [5,2X-
5] (average duration of X expression business) between TSs.Emulation has chosen in planning business list the TSs from 100 to 200
500 (do not consider that business block), calculate crosstalk factor values between the time weight light core for establishing optical channel.Optical channel is established
In, Path selection follows shortest route path, reuses auxiliary nomography and comes TW and SW selected to use, emulation compares FF
With two kinds of tactful results of LC.
We it is last with crosstalk factor values between the light core of average single TS and FS come more each tactful as a result, being expressed as, whereinLIndicate link set,TFor time slot sets,CIt is each
Light core set in MCF,DIndicate the collection of services for being successfully established optical channelIt indicates in time slotWhen link l glazing core
WithBetween light core between the crosstalk factor,Then indicate the time-weighted smooth core in whole network topology
Between crosstalk factor total value.Respectively indicate businessRequired FSs number and its duration.
Fig. 4 is wherein label " First-Fit " and " Least- using the simulation result of the NSFNET network of 7 core MCF
Cost " respectively indicates the selection strategy of SW and TW in auxiliary nomography, and " Normal " then indicates not consider crosstalk between light core
The network planning strategy of the factor.From the figure we can see that between considering that the strategy of crosstalk between light core can substantially reduce light core
Crosstalk factor values are up to 57%.In addition to this, " cost minimization " strategy can the result optimizing also than " initial hit " strategy be up to
43%, this is because " cost minimization " and strategy attempted all possible SWs and TWs combination after selected the crosstalk factor most
Optical channel is established in small combination.In addition to this, Fig. 5 also shows result as the COST239 network class of 19 core MCF.
Claims (6)
1. a kind of network plan method of multi-core optical fiber planning business, it is characterised in that：In the same time in non-conterminous light
Business transmission is carried out between core, and the crosstalk factor between light core is reduced while to meet planning business demand.
2. a kind of network plan method of multi-core optical fiber planning business according to claim 1, it is characterised in that：Given
A series of planning business in, it is assumed that the path of each planning business be it is fixed, between source node and destination node most
Short circuit by；The light core and frequency spectrum found out and be suitble to distribution on planning business path in each of the links are calculated, and selects most suitable build
Between immediately and release time, to reduce the crosstalk factor between time-weighted smooth core.
3. a kind of network plan method of multi-core optical fiber planning business according to claim 2, it is characterised in that：Due to every
A planning business has the earliest settling time and release time the latest of oneself, it would be desirable to select inside its time interval
It is most suitable for its time window, and distributes most suitable spectral window, to obtain the crosstalk factor between minimum time-weighted smooth core.
4. a kind of network plan method of multi-core optical fiber planning business according to claim 3, it is characterised in that：Assuming that giving
Determine a fixed route between source node and destination node, is used to select based on an auxiliary figure is established to each usable spectrum window
Provide the light core and frequency spectrum of the crosstalk factor between minimum time-weighted smooth core.
5. a kind of network plan method of multi-core optical fiber planning business according to claim 4, it is characterised in that：Based on auxiliary
Figure is helped, for the multi-core optical fiber under currently routing, needs to calculate whether each light core can be used current spectral window, for
The not available smooth core of current spectral window, will not establish corresponding secondary link in auxiliary figure, and to those available smooth cores,
It establishes its corresponding secondary link in auxiliary figure, and the value at cost of its link is established as crosstalk factor values between light core, and utilize
Formula（2）The crosstalk factor between the time-weighted smooth core of available light core is calculated,
（2）
Wherein,What is indicated is time slot sets, andThen indicate the light core in time slot tWithTime-frequency spectrum overlapping is occupied by optical path
Sum,Indicate light core crosstalk weighted value,Respectively represent the serial number of light core.
6. a kind of network plan method of multi-core optical fiber planning business according to claim 5, it is characterised in that：Based on auxiliary
Figure is helped, can be selected so that crosstalk factor values between time-weighted smooth coreThe smallest spectral window and time window, it is still, different
Spectral window and time window group credit union obtain different time weight light core between crosstalk factor values have two in this case
Kind strategy, i.e. initial hit strategy and cost minimization strategy, the former is using firstSpectral window and time window
To establish optical channel and distribute time slot and frequency band, the latter is all combination of scanning for combination, select cost it is the smallest that
It is a, i.e.,, according to the link that path is passed through, judge the light core used, from
And establish the optical path of current business.
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Effective date of registration: 20211227 Address after: 226400 Zhongtian Industrial Park, Hekou Town, Rudong County, Nantong City, Jiangsu Province Patentee after: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. Patentee after: Zhongtian Communication Technology Co., Ltd Address before: 226400 Zhongtian Industrial Park, Hekou Town, Rudong County, Nantong City, Jiangsu Province Patentee before: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. |