CN108810672A - A kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method and device - Google Patents
A kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method and device Download PDFInfo
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- CN108810672A CN108810672A CN201810484712.3A CN201810484712A CN108810672A CN 108810672 A CN108810672 A CN 108810672A CN 201810484712 A CN201810484712 A CN 201810484712A CN 108810672 A CN108810672 A CN 108810672A
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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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
- H04Q11/0005—Switch and router 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 present invention discloses a kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method and device, under the premise of current existing total frequency spectrum resource remains unchanged, according to bandwidth needed for new business, the consumption smaller modulation format of power is chosen for business, and utilize the forward and reverse bandwidth demand difference of business, non-symmetrical spectrum distribution is carried out for business, realizes the efficient utilization to optical-fiber network frequency spectrum resource, reduces the power that bearer service is consumed.
Description
Technical field
The present invention relates to technical field of photo communication, more particularly to a kind of optical-fiber network modulation format and frequency spectrum resource asymmetry point
Method of completing the square and device.
Background technology
With big data, cloud computing and the rise of HD video business, bandwidth needed for business is increasing in network,
The asymmetry of forward and reverse bandwidth demand is also more apparent.In traditional network, modulation format is typically that most high-order is selected to use
To adapt to quick bandwidth increased requirement, but the power consumption higher of the modulation format of high-order, transmission range are also shorter.And
And the transmitter of fixed modulation format fixed-bandwidth can not also adapt to the characteristic of current business dynamic change at any time.Another party
Face is distributed using the symmetrical frequency spectrum method of salary distribution of forward and reverse, or not with business frequency spectrum in traditional network
The increase of symmetry, this method of salary distribution can bring waste to the frequency spectrum resource in network.
In recent years, the proposition that can be sliced transmitter allows the signal for generating different modulating format in business transmitting terminal to use
To meet different bandwidth demand.Under normal conditions, can meet the most higher order modulation formats of distance restraint can be selected.In fact,
Since the transmission rate of different modulating format is different, for some business demands, different modulation formats might have occupancy phase
Same frequency spectrum resource demand.And only considers the modulation format of most high-order and carry out service bearer and can bring the waste of power.
On the other hand, in optical-fiber network, link among the nodes is connected by two different optical fiber, therefore can be with
Different spectrum allocation strategies is respectively adopted for two optical fiber, without keeping the spectrum occupancy of two optical fiber identical.
This asymmetrical frequency spectrum mode can increase the utilization rate of network spectrum resource.Simultaneously as the spectrum number occupied is reduced,
The power attenuation of transmitter can be reduced.
Invention content
The technical problem to be solved by the present invention is to：A kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution side are provided
Method and device, according to bandwidth needed for new business, are chosen under the premise of current existing total frequency spectrum resource remains unchanged for business
The smaller modulation format of power is consumed, and using the forward and reverse bandwidth demand difference of business, non-symmetrical spectrum point is carried out for business
Match, realize the efficient utilization to optical-fiber network frequency spectrum resource, reduces the power that bearer service is consumed.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, include the following steps：
Step 1, source node and destination node according to new business carry out router-level topology to new business, obtain corresponding road
By.
Step 2 analyzes the bandwidth demand to new business, for the bandwidth demand of forward and reverse, using non-right
Modulation format distribution method is claimed to be allocated.Business forward direction bandwidth demand is expressed as fw (Gb/s), and the reversed demand of business is expressed as
rw(Gb/s).First according to positive highest modulation levels maxMfWith reversed highest modulation levels maxMrCalculate required frequency spectrum
Then gap number inquires the required frequency spectrum number of modulation format of other grades.Ensureing with highest level modulation format institute
Under the premise of needing spectrum number purpose identical, the positive modulation levels M of the lowest class is selectedfAnd back-modulation grade Mr。
Step 3 obtains the modulation format needed for new business and required frequency spectrum number, positive demand according to the 2nd step
Spectrum number is BF, m, the spectrum number of reversed demand is expressed as BR, m.Update service parameter and corresponding forward and reverse most to a high-profile
Grade maxM processedf=Mf, maxMr=Mr。
Step 4, according to the obtained frequency spectrum information of number of the 2nd step, using non-right on the 1st obtained service path of step
Frequency spectrum distributing method is claimed to carry out frequency spectrum distribution.First according to positive demand spectrum number BF, mPositive frequency spectrum distribution is carried out, if distribution
Success, then according to reversed demand frequency spectrum number BR, mCarry out inverse frequency spectrum distribution.If positive and inverse frequency spectrum demand is distributed into
Work(then carries out the 5th step, and otherwise obstruction falls the business
Step 5, according to the 2nd step is obtained positive and back-modulation format information, provided for frequency spectrum in the 4th step is met
The path of source distribution, inquires whether the path meets distance restraint under current modulation format.If it is satisfied, then the 6th step is carried out,
Otherwise corresponding highest modulation levels are reduced, and re-starts the 2nd step.If all modulation formats are unsatisfactory for distance restraint,
Then obstruction falls the business.
Step 6, according to the service path information of the forward and reverse of new business and the spectrum information occupied respectively, establish phase
The light path answered discharges the frequency spectrum gap of distribution after business is transmitted.
A kind of above-mentioned optical-fiber network frequency spectrum resource asymmetric distribution device includes：
Routing calculation module carries out router-level topology for the source node and destination node according to new business.
Modulation format division module is selected for the bandwidth demand according to new business forward and reverse in forward and reverse
The modulation format of high efficiency of energy simultaneously provides required frequency spectrum number under corresponding modulation format.
Frequency spectrum distribution module, for according to the frequency spectrum number demand of new business forward and reverse, in service path forward direction and
Frequency spectrum resource distribution is reversely carried out respectively.
Network resource module, the power consumption information for storing different modulating format, the transmission distance of different modulating format
From information, the topology information and frequency spectrum resource information of network；Topology information includes node and link information, and link information includes chain
The distance and frequency spectrum resource on road distribute information.
Service management module, for being believed according to the shared frequency spectrum resource of new business routing information and forward and reverse difference
Breath, carries out establishing light path between a source node and a destination node, and light path is removed after business is transmitted and discharges frequency spectrum resource,
And corresponding frequency spectrum service condition is updated to network resource module.
The present invention to business in optical-fiber network by carrying out asymmetrical modulation format distribution, because adjusting when reducing bearer service
Format processed selects the power attenuation brought.Meanwhile it using the asymmetry of business forward and reverse bandwidth demand, being distributed in frequency spectrum
When for positive and frequency spectrum resource of reversely distributing according to need so that the frequency spectrum resource in network can be by more efficient utilization.It is this
Modulation format and the asymmetric distribution method of frequency spectrum resource can save frequency spectrum resource and reduce the work(that bearer service is consumed
Rate.
Description of the drawings
Fig. 1 is a kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method described in embodiment of the present invention
Flow chart；
Fig. 2 is the present invention for realizing a kind of described optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method
Installation drawing.
Specific implementation mode
As shown in Figure 1, the optical-fiber network frequency spectrum resource asymmetric distribution method of the present invention based on the business hours includes
Following steps：
Step 101, source node and destination node according to new business carry out router-level topology to new business, obtain corresponding
Routing.
Step 102 analyzes the bandwidth demand of new business, for the bandwidth demand of forward and reverse, using non-right
Modulation format distribution method is claimed to be allocated.Business forward direction bandwidth demand is expressed as fw (Gb/s), and the reversed demand of business is expressed as
rw(Gb/s).First according to positive highest modulation levels maxMfWith reversed highest modulation levels maxMrCalculate required frequency spectrum
Then gap number inquires the required frequency spectrum number of modulation format of other grades.Ensureing with highest level modulation format institute
Under the premise of needing spectrum number purpose identical, the positive modulation levels M of the lowest class is selectedfAnd back-modulation grade Mr。
Step 103 obtains the modulation format needed for new business and required frequency spectrum number according to the 102nd step, positive
Demand spectrum number is BF, m, the spectrum number of reversed demand is expressed as BR, m.Update service parameter and corresponding forward and reverse most
High modulation level maxMf=Mf, maxMr=Mr。
Step 104, according to the obtained frequency spectrum information of number of the 102nd step, adopted on the 101st obtained service path of step
Frequency spectrum distribution is carried out with non-symmetrical spectrum distribution method.First according to positive demand spectrum number BF, mPositive frequency spectrum distribution is carried out, such as
Fruit is allocated successfully, then according to reversed demand frequency spectrum number BR, mCarry out inverse frequency spectrum distribution.If positive and inverse frequency spectrum demand is equal
It is allocated successfully, then carries out the 105th step, otherwise obstruction falls the business.
Step 105, according to the 102nd step is obtained positive and back-modulation format information, for meeting in the 104th step
The path of frequency spectrum resource distribution, inquires whether the path meets distance restraint under current modulation format.If it is satisfied, then carrying out
Otherwise corresponding highest modulation levels are reduced, and re-start the 102nd step by the 106th step.If all modulation formats are unsatisfactory for
Distance restraint then blocks to fall the business.
Step 106, according to the service path information of the forward and reverse of new business and the spectrum information occupied respectively, establish
Corresponding light path discharges the frequency spectrum gap of distribution after business is transmitted.
A kind of optical-fiber network frequency spectrum resource asymmetric distribution device realization, including：
Routing calculation module carries out router-level topology for the source node and destination node according to new business.
Modulation format division module is selected for the bandwidth demand according to new business forward and reverse in forward and reverse
The modulation format of high efficiency of energy simultaneously provides required frequency spectrum number under corresponding modulation format.
Frequency spectrum distribution module, for according to the frequency spectrum number demand of new business forward and reverse, in service path forward direction and
Frequency spectrum resource distribution is reversely carried out respectively.
Network resource module, the power consumption information for storing different modulating format, the transmission distance of different modulating format
From information, the topology information and frequency spectrum resource information of network.Topology information includes node and link information, and link information includes chain
The distance and frequency spectrum resource on road distribute information.
Service management module, for being believed according to the shared frequency spectrum resource of new business routing information and forward and reverse difference
Breath, carries out establishing light path between a source node and a destination node, and light path is removed after business is transmitted and discharges frequency spectrum resource,
And corresponding frequency spectrum service condition is updated to network resource module.
Embodiment 1：
The optical-fiber network frequency spectrum resource asymmetric distribution method based on the business hours of illustration, considers ideal situation, suddenly
Protection bandwidth between slightly each business
Step 1 assumes that there are 6 kinds of modulation format BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM difference in network
Corresponding modulating grade is 1 to 6.The corresponding transmission rate of 6 kinds of modulation formats, consumed power and transmission range are as shown in table 1.
Table 1
Step 2 assumes positive bandwidth 87.5Gb/s, 75 Gb/s of inverse bandwidth needed for some new business.Every chain in network
The frequency spectrum sub-carrier number on road is 10.
Step 3, according to optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, using new business source node and
Destination node and network resource module are route for business, obtain service path, it is assumed that path length 200km.Assuming that
Frequency spectrum resource occupancy situation is as shown in table 2 and table 3 on the path.Table 2 indicates path forward direction frequency spectrum resource occupancy and idle condition,
Table 3 indicates that path inverse frequency spectrum occupies and idle condition, 1 expression occupy, and 0 indicates idle.
Table 2
Table 3
Step 4, according to optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, be calculated first in 64QAM
Spectrum number needed for lower forward direction is 2, and reversed required spectrum number is 1.Then it calculates required under other inferior grade modulation formats
Spectrum number.For forward direction, spectrum number is 2 required for 32QAM and 16QAM.For reversed, other inferior grade modulation format institutes
The frequency spectrum number needed is all higher than 1.So choosing forward direction modulation format as 16QAM, spectrum number needed for forward direction is 2, back-modulation lattice
Formula is 64QAM, and reversed required spectrum number is 1.
Step 5, according to frequency spectrum coherence and continuity principle, utilize initial hit in the path forward and reverse of new business
Method carries out frequency spectrum distribution.There are enough frequency spectrum resources for distribution through inquiring forward and reverse, but due to reversely in 64QAM
Transmission range under modulation format only has 150km, is less than current path length 200km.Then reversed maximum modulation format is dropped
For 32QAM, modulation format distribution is re-started.It is 32QAM in maximum modulation format, reversed required spectrum number is 2.
At this point, the required spectrum numbers of 8QAM and 16QAM are also 2.Therefore it is 8QAM, required spectrum number to reselect back-modulation format
It is 2.There are enough frequency spectrum resources for distribution through inquiring forward and reverse, then initial hit method is used to carry out frequency spectrum point
Match, is reversed frequency spectrum resource of the distribution marked as 5 to 6 for positive frequency spectrum resource of the distribution marked as 4 to 5.Forward and reverse tune
Format processed is satisfied by distance restraint.The path forward and reverse frequency spectrum resource after resource is assigned with to occupy and idle condition such as table
4 and table 5 shown in.
Table 4
Table 5
Step 6, after frequency spectrum is allocated successfully, for new business establish light path and by the spectrum occupancy of new business update arrive
In network resource module.
Claims (4)
1. a kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, which is characterized in that include the following steps：
Step 1, source node and destination node according to new business carry out router-level topology to new business, obtain corresponding routing；
Step 2 analyzes the bandwidth demand of new business, for the bandwidth demand of forward and reverse, using asymmetric modulation
Format assignment method is allocated；Obtain the modulation format needed for new business and required frequency spectrum number；
Step 3 obtains the modulation format needed for new business and required frequency spectrum number, positive demand frequency spectrum according to the 2nd step
Number is Bf,m, the spectrum number of reversed demand is expressed as Br,m；Update service parameter and the modulation of corresponding forward and reverse highest etc.
Grade maxMf=Mf, maxMr=Mr；
Step 4, according to the obtained frequency spectrum information of number of the 2nd step, on the 1st obtained service path of step use asymmetric frequency
It composes distribution method and carries out frequency spectrum distribution；
Step 5, according to the 2nd step is obtained positive and back-modulation format information, for meeting frequency spectrum resource point in the 4th step
The path matched, inquires whether the path meets distance restraint under current modulation format；If it is satisfied, then carrying out the 6th step, otherwise
Corresponding highest modulation levels are reduced, and re-start the 2nd step；If all modulation formats are unsatisfactory for distance restraint, hinder
Plug falls the business；
Step 6, according to the service path information of the forward and reverse of new business and the spectrum information occupied respectively, establish corresponding
Light path discharges the frequency spectrum gap of distribution after business is transmitted.
2. as described in claim a kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, which is characterized in that step
It is allocated specially using asymmetric modulation format assignment method in rapid 2：Business forward direction bandwidth demand is expressed as fw (Gb/s),
The reversed demand of business is expressed as rw (Gb/s)；First according to positive highest modulation levels maxMfWith reversed highest modulation levels
maxMrRequired frequency spectrum gap number is calculated, the required frequency spectrum number of modulation format of other grades is then inquired；Ensureing
Under the premise of identical with spectrum number purpose needed for highest level modulation format, the positive modulation levels M of the lowest class is selectedfAnd
Back-modulation grade Mr。
3. as described in claim a kind of optical-fiber network modulation format and frequency spectrum resource asymmetric distribution method, which is characterized in that step
First according to positive demand spectrum number B in rapid 4F, mPositive frequency spectrum distribution is carried out, if be allocated successfully, according to reversed demand frequency
Compose number BR, mCarry out inverse frequency spectrum distribution；If positive and inverse frequency spectrum demand is allocated successfully, the 5th step is carried out, is otherwise hindered
Plug falls the business.
4. a kind of optical-fiber network frequency spectrum resource asymmetric distribution device, which is characterized in that including：
Routing calculation module carries out router-level topology for the source node and destination node according to new business；
Modulation format division module selects the energy for the bandwidth demand according to new business forward and reverse in forward and reverse
Efficient modulation format simultaneously provides required frequency spectrum number under corresponding modulation format；
Frequency spectrum distribution module, for the frequency spectrum number demand according to new business forward and reverse, in service path forward and reverse
Frequency spectrum resource distribution is carried out respectively.
Network resource module, the power consumption information for storing different modulating format, the transmission range letter of different modulating format
Breath, the topology information and frequency spectrum resource information of network；Topology information includes node and link information, and link information includes link
Distance and frequency spectrum resource distribute information.
Service management module is used for according to the shared frequency spectrum resource information of new business routing information and forward and reverse difference,
It carries out establishing light path between a source node and a destination node, light path is removed after business is transmitted and discharges frequency spectrum resource, and
Corresponding frequency spectrum service condition is updated to network resource module.
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Cited By (1)
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Application publication date: 20181113 |