CN105721130A - Spectrum distribution method based on sub-band virtual concatenation technology in elastic optical network - Google Patents

Spectrum distribution method based on sub-band virtual concatenation technology in elastic optical network Download PDF

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Publication number
CN105721130A
CN105721130A CN201610099247.2A CN201610099247A CN105721130A CN 105721130 A CN105721130 A CN 105721130A CN 201610099247 A CN201610099247 A CN 201610099247A CN 105721130 A CN105721130 A CN 105721130A
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Prior art keywords
frequency gap
sub
shortest path
virtual concatenation
modulation system
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CN201610099247.2A
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沈建华
冯海燕
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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Nanjing Post and Telecommunication University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • 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
    • H04L45/24—Multipath

Abstract

The invention discloses a spectrum distribution method based on a sub-band virtual concatenation technology in an elastic optical network. According to the spectrum distribution method, on the basis of considering the topological structure of the optical network, the shortest path and the secondarily shortest path are calculated and selected as the basis of selecting the best modulation manner; and, in combination with the sub-band virtual concatenation technology, frequency gap numbers required by service requests are uniformly distributed onto the shortest path and the secondarily shortest path to transmit. Compared with the single modulation manner and distribution of all adjacent sub-bands along the same path in the traditional optical network, the utilization rate of network resources can be increased to a large extent through combination of multiple modulation manners and the virtual concatenation technology, such that the total blocking rate of services is reduced. By means of the invention, the problem that the service blocking rate can be further reduced by using multiple modulation manners on the basis of the sub-band virtual concatenation technology can be solved.

Description

Based on the frequency spectrum distributing method of sub-band Virtual Concatenation Technology in elastic optical network
Technical field
The present invention relates to the frequency spectrum distributing method based on sub-band Virtual Concatenation Technology in elastic optical network, belong to optic communication and optical-fiber network technical field.
Background technology
Traditional wavelength-division multiplex (WavelengthDivisionMultiplexing, WDM) optical-fiber network follows the fixed frequency grid standard of ITU-T, there is the problems such as network spectrum resource distribution is dumb, energy consumption is high, it is difficult to adapt to fast-changing magnanimity information transmission in the Internet.Flexible grid elastic optical network (Flex-gridOpticalNetwork) has the advantages such as frequency grid granularity is less, support optical channel portions of the spectrum overlapping, avoid the wasting of resources distributing fixed frequency spectrum when setting up light path and cause, drastically increase the utilization rate of frequency spectrum resource, thus becoming the Next Generation Optical Transport Network network of great potential.
Based in CO-OFDM elastic optical network, optical channel is made up of multiple CO-OFDM sub-bands (Sub-Band), and each sub-band comprises multiple subcarrier.In order to improve network resource utilization better, it is referred to the virtual concatenation (VirtualConcatenation in SDH/MSTP network, VCAT) technology, it is split as multiple virtual container (VirtualContainer by the bandwidth of a passage, VC), and make virtual container be transmitted respectively along different paths, finally reconfigure again at receiving terminal.Sub-band in CO-OFDM optical-fiber network is similar with the virtual container (VC) in SDH/MSTP optical-fiber network.Therefore, it can be applied in the CO-OFDM optical channel of frequency domain the Virtual Concatenation Technology of time domain, be referred to as CO-OFDM sub-band Virtual Concatenation Technology.[Kozicki, B.；Opticalpathaggregationfor1-Tb/stransmissioninspectrum-sl icedelasticopticalpathnetwork.IEEEPTL, Vol.22, Issue:17,2010]
One of key problem in elastic optical network is route and frequency spectrum distribution (RSA), namely an end-toend lightpath footpath is set up in self-adapted service bandwidth demand mode, during the frequency spectrum of VCAT Technology application to elastic optical network is distributed, it is possible to effectively reduce service blocking rate.Meanwhile, based on VCAT uniform distribution service bandwidth on mulitpath, there is optimum performance.[G.X.Shen.BenefitsofSub-BandVirtualConcatenation (VCAT) inCO-OFDMOpticalNetworks.ICTON2012]
But, the document for CO-OFDM optical-fiber network virtual concatenation having been proposed that at present assumes that the frequency gap number of service request in every light path is identical mostly, and the unequal frequency gap number of this light path required with the request of differentiated business in a practical situation exists larger difference；On the other hand, even if the speed of light path request is fixed, then suitable modulation system is adopted can be effectively improved network resource utilization (as less in the frequency gap number required for the modulation system of high-order) according to the transmission range of business.Obviously, how VCAT technology had very important effect with the flexible spectrum distribution mechanism supporting Different Modulations for elastic optical network raising spectrum efficiency and reduction service blocking rate.
In the present invention, best modulation system is selected to use for reference [BocoiA according to path, SchusterM, RambachF, etal.Reach-dependentcapacityinopticalnetworksenabledbyOF DM [C] .OpticalFiberCommunication-incudespostdeadlinepapers, 2009.OFC2009.Conferenceon.IEEE, 2009:1-3.] in the corresponding relation of the path that proposes and best modulation system.
Summary of the invention
The technical problem to be solved is: for, in the elastic optical network supporting sub-band Virtual Concatenation Technology, introducing the frequency spectrum distributing method supporting Different Modulations such that it is able to reduce the service blocking rate of network further.
For solving above-mentioned technical problem, the present invention proposes the frequency spectrum resource allocation method based on sub-band Virtual Concatenation Technology in a kind of elastic optical network, comprises the following steps:
Step 1: when client traffic connection request arrives, first calculates the shortest path from source node to destination node and time shortest path, and this two paths is without coincidence link；
Step 2: for two paths calculated, in conjunction with the modulation system selecting the best according to the length of time shortest path；
Step 3: calculate required frequency gap number according to service request speed and best modulation system, is evenly distributed to total frequency gap number in two transmission paths；
Step 4: judge whether this two transmission paths has the frequency gap meeting continuously available frequency gap number simultaneously.If it has, perform step 5, otherwise block；
Step 5: start to select continuously available frequency gap from minimum label, set up light path.
Described modulation system includes BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM.Maximum transmission distance corresponding to every kind of modulation system is by obtaining after considering physical layer factor (such as OSNR).Maximum transmission distance corresponding to BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM respectively 9600,4800,2400,1200,600 and 300km.
The frequency gap of the continuously available frequency gap number of described each request calculates according to below equation:
(1)CiRepresent the speed of i-th request, can be generated by random matrix；
(2)FslotRepresent the frequency range that a frequency gap fixes to take, it is assumed that for 12.5GHz；
(3)biSpan be 32,16,8,4,2,1}, select b according to that the longest paths in most minor axis and time most minor axisiValue；
(4)SiRepresent total frequency gap number that i-th request is required.
Computing formula is as follows:
Si=Ci/(Fslot×bi)
b i = 32 , D &le; 300 16 , 300 < D &le; 600 8 , 600 < D &le; 1200 4 , 1200 < D &le; 2400 2 , 2400 < D &le; 4800 1 , 4800 < D &le; 9600
Wherein, D represents time the distance (km) of most minor axis.
The present invention, when carrying out routing and frequency spectrum distribution, has used VCAT technology and Different Modulations so that under same business load simultaneously, and the while that the average blocking rate of whole network being minimum, the availability of frequency spectrum is the highest.
With the modulation system that conventional optical network is single, distribute all adjacent sub-bands and along compared with same path, the combination of Different Modulations and Virtual Concatenation Technology can improve the utilization rate of Internet resources to a great extent, thus reducing the total blocking rate of business.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is described in detail:
It implements process as it is shown in figure 1, comprise the following steps:
Step 1: when client traffic connection request arrives, first calculates the shortest path from source node to destination node and time shortest path, and this two paths is without coincidence link；
Step 2: for two paths calculated, in conjunction with the modulation system selecting the best according to the length of time shortest path；
Step 3: calculate required frequency gap number according to service request speed and best modulation system, is evenly distributed to total frequency gap number in two transmission paths；
Step 4: judge whether this two transmission paths has the frequency gap meeting continuously available frequency gap number simultaneously.If it has, perform step 5, otherwise block；
Step 5: start to select continuously available frequency gap from minimum label, set up light path.
The calculating of frequency gap number required under best modulation system in the selection of the best modulation system of step 2 and step 3 draws according to below equation:
Si=Ci/(Fslot×bi)
b i = 32 , D &le; 300 16 , 300 < D &le; 600 8 , 600 < D &le; 1200 4 , 1200 < D &le; 2400 2 , 2400 < D &le; 4800 1 , 4800 < D &le; 9600
Wherein, D represents time the distance (km) of most minor axis.
In step 2, select the length of time shortest path as best modulation system according to being if using the length of the shortest warp as the standard of selecting modulation mode, it is likely that make to adopt this kind of modulation system cannot ensure the quality that signal transmits on secondary shortest path.If on the contrary using the length of the shortest secondary warp as the standard of selecting modulation mode, the modulation system more low order of the more long employing of distance, signal transmission quality on the shortest warp can be guaranteed.Therefore adopt the distance of time shortest path as the foundation selecting best modulation system.
Assuming to choose the Fslot=12.5GHz size as a frequency slot, if a service request speed is 300Gbit/s, the length of secondary most minor axis is 2000km, then bi=4, the modulation system of selection is 8QAM, and required frequency gap number is 6, reduces 3/4 compared to 24 frequency gaps needed for adopting BPSK under same request speed, therefore greatly reduces service blocking rate.
The present invention, when carrying out routing and frequency spectrum distribution, selects best modulation system according to shortest path the shortest, secondary reducing as far as possible on the basis of frequency gap occupancy so that the total request frequency gap number of network is minimum.First pass through K bar shortest path first calculate two shortest paths and there is no cross link, then select the best modulation system that longest path in both is corresponding, and calculate now required minimum frequency gap number.If there being enough continuously available frequency spectrum resources just to carry out frequency spectrum distribution, otherwise block.It is demonstrated experimentally that VCAT technology compares conventional optical network transmission can reduce service blocking rate to a great extent.If in conjunction with Different Modulations, it is assumed that choose the Fslot=12.5GHz size as frequency slot, bi corresponding to subcarrier capabilities corresponding to BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM respectively 1,2,4,8,16 and 32.For same service request, according to Si=Ci/ (Fslot × bi), order of modulation is more high, and namely bi is more big, then the frequency gap number needed for this service request is more few, thus the service blocking rate reduced in network.

Claims (3)

1. the frequency spectrum distributing method based on sub-band Virtual Concatenation Technology in elastic optical network, its feature comprises the following steps:
Step 1: when client traffic connection request arrives, first calculates the shortest path from source node to destination node and time shortest path, and this two paths is without coincidence link；
Step 2: for two paths calculated, in conjunction with the modulation system selecting the best according to the length of time shortest path；
Step 3: calculate required frequency gap number according to service request speed and best modulation system, is evenly distributed to total frequency gap number in two transmission paths；
Step 4: judge whether this two transmission paths has the frequency gap meeting continuously available frequency gap number simultaneously, if it has, perform step 5, otherwise blocks；
Step 5: start to select continuously available frequency gap from minimum label, set up light path.
2. the method according to right 1, it is characterised in that the modulation system of described step 2 includes BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM different modulating mode, and every kind of described modulation system is corresponding maximum transmission distance respectively.
3. the method according to right 1, it is characterised in that the frequency gap of the continuously available frequency gap number of each service request calculates according to below equation:
(1)CiRepresent the speed of i-th service request；
(2)FslotRepresent the frequency range that a frequency gap fixes to take, it is assumed that for 12.5GHz；
(3)biSpan be 32,16,8,4,2,1}, select b according to the distance of secondary most minor axisiValue；
(4)SiRepresent total frequency gap number that i-th request is required:
Computing formula is as follows:
Si=Ci/(Fslot×bi)
b i = 32 , D &le; 300 16 , 300 < D &le; 600 8 , 600 < D &le; 1200 4 , 1200 < D &le; 2400 2 , 2400 < D &le; 4800 1 , 4800 < D &le; 9600
Wherein, D represents time the distance (km) of most minor axis.
CN201610099247.2A 2016-02-23 2016-02-23 Spectrum distribution method based on sub-band virtual concatenation technology in elastic optical network Pending CN105721130A (en)

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CN106412728A (en) * 2016-08-31 2017-02-15 北京邮电大学 Attack-perceived multi-domain elastic optical network route and frequency spectrum distribution method and system
CN112203165A (en) * 2020-09-07 2021-01-08 烽火通信科技股份有限公司 Method and system for realizing flexible grid service in OTN
CN113132827A (en) * 2021-04-09 2021-07-16 烽火通信科技股份有限公司 Modulation adaptive route calculation method and device under elastic optical network
WO2022198735A1 (en) * 2021-03-26 2022-09-29 苏州大学 Osnr-aware spectrum allocation method and system under assurance of optical channel performance

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CN103051547A (en) * 2012-12-24 2013-04-17 北京邮电大学 Routing and spectrum resource allocation method and system for resource awareness in elastic optical path network
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106412728A (en) * 2016-08-31 2017-02-15 北京邮电大学 Attack-perceived multi-domain elastic optical network route and frequency spectrum distribution method and system
CN106412728B (en) * 2016-08-31 2019-08-30 北京邮电大学 The routing of multiple domain elastic optical network and frequency spectrum distributing method and the system of attack perception
CN112203165A (en) * 2020-09-07 2021-01-08 烽火通信科技股份有限公司 Method and system for realizing flexible grid service in OTN
WO2022198735A1 (en) * 2021-03-26 2022-09-29 苏州大学 Osnr-aware spectrum allocation method and system under assurance of optical channel performance
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CN113132827A (en) * 2021-04-09 2021-07-16 烽火通信科技股份有限公司 Modulation adaptive route calculation method and device under elastic optical network
CN113132827B (en) * 2021-04-09 2022-03-25 烽火通信科技股份有限公司 Modulation adaptive route calculation method and device under elastic optical network

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