CN104796215A - Method and device for improving optical network transmission efficiency - Google Patents
Method and device for improving optical network transmission efficiency Download PDFInfo
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- CN104796215A CN104796215A CN201510109694.7A CN201510109694A CN104796215A CN 104796215 A CN104796215 A CN 104796215A CN 201510109694 A CN201510109694 A CN 201510109694A CN 104796215 A CN104796215 A CN 104796215A
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Abstract
The invention discloses a method and a device for improving optical network transmission efficiency. According to the method, the signal transmission spectrum efficiency of an optical channel is determined through the optical transmission distance of the optical channel, so that the occupancies of different modulation formats in a frame structure are determined, and a transmission frame based on a time domain hybrid modulation technology is established so as to modulate the optical channel. Compared with the modulation method in the prior art adopting a discretization modulation format, the method adjusts the spectrum efficiency of the optical channel according to the transmission distance of each optical channel, so that the linear rate of each optical channel is improved, furthermore, the optical network transmission efficiency is improved on the whole.
Description
Technical field
The present invention relates to field of signal transmissions, relating to a kind of method and apparatus for improving optical-fiber network efficiency of transmission in particular.
Background technology
Along with the exponential increase of internet traffic, the dynamic of optical-fiber network, flexibility and spectrum efficient strengthen further.
Current when modulating optical network transmission signal, under the prerequisite ensureing a certain acceptable error rates of data (BER), because often kind of modulation format all exists a maximum unrepeatered transmission distance, traditional discretization modulation technique adopts for the optical channel of physical distance between two kinds of modulation formats the reliability transmitted with guarantee information compared with the modulation format of low side usually, but will certainly reduce the validity of information transmission.Such as, suppose for single QPSK and 16QAM modulation format, its maximum non-relay optical delivery distance is respectively 5118 kilometers and 850 kilometers.Be the optical channel of 3000km for a length, traditional discretization modulation format selection mode can only select QPSK transmission frame (its BS=2bit/ symbol) to modulate this optical channel, even if single QPSK modulation format can support the optical transport scope of 5118km.But this simple discretization modulation format selects the very large waste that will inevitably cause spectral bandwidth, makes optical-fiber network efficiency of transmission reduce.
Summary of the invention
In view of this, the invention provides a kind of method and apparatus for improving optical-fiber network efficiency of transmission, the method adjusts optical-fiber network based on time domain Hybrid Modulation Technology, improves optical-fiber network efficiency of transmission.
For achieving the above object, the invention provides following technical scheme:
For improving a method for optical-fiber network efficiency of transmission, comprising:
Obtain the optical transport distance of optical channel;
According to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determine the Signal transmissions spectrum efficiency of optical channel;
According to the spectrum efficiency of unlike signal modulation format and the Signal transmissions spectrum efficiency of described optical channel, determine the occupation rate of unlike signal modulation format in optical transport frame, described optical transport frame at least comprises two kinds of format modulation signals;
Utilize unlike signal modulation format occupation rate in optical transport frame, set up time domain hybrid modulation transmission frame, optical channel is modulated.
Preferably, the described spectrum efficiency according to unlike signal modulation format and described optical passage signal transmission spectrum efficiency, determine to comprise the probability that unlike signal modulation format occupies in optical transport frame:
Obtain the spectrum efficiency of unlike signal modulation format;
According to computing formula BS=∑
i ∈ Qp
ibS
i, calculate unlike signal modulation format institute's occupation rate in the frame structure;
Wherein, pi corresponds to particular modulation format probability in a frame, and BSi is the spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.
Preferably, describedly utilize the occupation rate of unlike signal modulation format in optical transport frame, set up time domain hybrid modulation transmission frame, optical channel is modulated, also comprises afterwards:
Build integral linear programming model, the optical channel after modulation is assessed.
Preferably, describedly utilize the occupation rate of unlike signal modulation format in optical transport frame, set up time domain hybrid modulation transmission frame, optical channel is modulated, also comprises afterwards:
Utilize the heuritic approach in popin face, the optical channel after modulation is assessed.
For improving a device for optical-fiber network efficiency of transmission, comprising:
Information acquisition unit, for obtaining the optical transport distance of optical channel;
Spectrum efficiency determining unit, for according to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determines optical passage signal transmission spectrum efficiency;
Occupation rate determining unit, for according to the spectrum efficiency of unlike signal modulation format and described optical passage signal transmission spectrum efficiency, determine unlike signal modulation format occupation rate in optical transport frame, described optical transport frame at least comprises two kinds of modulation formats;
Modulating unit, for utilizing the occupation rate of unlike signal modulation format in optical transport frame, setting up time domain hybrid modulation transmission frame, modulating optical channel.
Preferably, described occupation rate determining unit comprises:
Information gathering subelement, obtains the spectrum efficiency of unlike signal modulation format;
Computation subunit, for according to computing formula BS=∑
i ∈ Qp
ibS
i, calculate the occupation rate of unlike signal modulation format in optical transport frame;
Wherein, p
icorrespond to particular modulation format probability in a frame, BS
ithe spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.
Preferably, described device also comprises: assessment unit, for assessing the optical channel after modulation.
Preferably, described assessment unit, for building integral linear programming model, assesses the optical channel after modulation.
Preferably, described assessment unit, for utilizing the heuritic approach in popin face, assesses the optical channel after modulation.Known via above-mentioned technical scheme, the invention discloses a kind of method and apparatus for improving optical-fiber network efficiency of transmission.The method determines the Signal transmissions spectrum efficiency of optical channel by the optical transport distance of optical channel.And then, determine different adjustment forms occupation rate in the frame structure, thus set up the transmission frame based on time domain Hybrid Modulation Technology, optical channel is modulated.Compared with the modulator approach adopting discretization modulation format with prior art, the present invention is according to the transmission range of every bar optical channel, and the spectrum efficiency of adjustment optical channel, improves every bar optical channel wire rate, thus improve optical-fiber network efficiency of transmission on the whole.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 shows a kind of flow process signal improving an embodiment of the method for optical-fiber network efficiency of transmission of the present invention;
Fig. 2 shows the curve relation figure of optical transport distance of the present invention and Signal transmissions frequency spectrum;
Fig. 3 shows a TDHM transmission frame;
Fig. 4 compares in 6 node 9 link networks, the Internet Transmission transmission capacity difference under different designs scheme;
Fig. 5 compares in 24 node 43 link networks, the network transmission capacity difference under different designs scheme;
Fig. 6 shows a kind of structural representation improving an embodiment of the device of optical-fiber network efficiency of transmission of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The flow process signal of an embodiment of a kind of method for improving optical-fiber network efficiency of transmission of the present invention is shown see Fig. 1.
As shown in Figure 1, the method comprises:
101: the optical transport distance obtaining optical channel.
102: according to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determine optical passage signal transmission spectrum efficiency.
The curve relation figure of optical transport distance of the present invention and Signal transmissions frequency spectrum is shown see Fig. 2.
In the present embodiment, the optical channel in our setting network is all modulate based on the TDHM technology of QPSK & 16QAM (p1, p2), and wherein, QPSK and 16QAM represents different modulation formats.We use the curve (as Fig. 2) obtained in experiment to find out certain optical transport apart from corresponding optical passage signal transmission spectrum efficiency BS (bit/ symbol).Note, we arrange an attenuation coefficient 0.8 in order to eliminate the impact of ecotopia under laboratory conditions.Meanwhile, we set for single (without mixing) QPSK and 16QAM, and its greatest optical transmission range is respectively 5118 kilometers and 850 kilometers.
103: according to the spectrum efficiency of unlike signal modulation format and the Signal transmissions spectrum efficiency of described optical channel, determine the occupation rate of unlike signal modulation format in optical transport frame.
It should be noted that, time domain Hybrid Modulation Technology (TDHM) can support the multiple modulation format be interweaved in time domain.A TDHM transmission frame is shown see Fig. 3.QPSK and 16QAM configures by 1:1 mode by this frame.Usually, the TDHM symbol shown in Fig. 3 can be expressed as QPSK & 16QAM (p by us
1, p
2), p here
1, p
2be respectively the probability that above-mentioned two kinds of modulation formats occur in a frame.
Spectrum efficiency BS (i.e. bit/ symbol) based on the signal of TDHM modulation technique can be calculated by (1) formula:
BS=∑
i ∈ Qp
ibS
ibit/ symbol (1)
Here, p
icorrespond to particular modulation format probability in a frame, BS
ithe spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.In figure 3, corresponding to QPSK, its BS
1=2bit/ symbol, and for its BS of 16QAM
2=4bit/ symbol.Therefore, one is mixed with to the TDHM frame of QPSK and 16QAM, its spectrum efficiency BS can between 2bit/ symbol to 4bit/ symbol consecutive variations.A wire rate employing the optical channel of TDHM technology modulation can be calculated by (2) formula:
LR=BS*2R bit/ second (2)
Here R (symbol/second) baud rate that is signal, " 2 " are corresponding to the palarization multiplexing on x and y direction.Consider TDHM modulation technique to be applied in the optical transmission system at a fixing 28G symbol/second baud rate and 50GHz fixed frequency spectrum interval, the wire rate size of each optical channel only depends on the spectrum efficiency of TDHM signal, and then only by the occupation rate { p of often kind of modulation format in optical transport frame
idistribution determine.
104: utilize the occupation rate of unlike signal modulation format in optical transport frame, set up time domain hybrid modulation transmission frame, optical channel is modulated.
Composition graphs 2, traditional discretization adaptation rate scheme all selects QPSK modulation format for all optical channels of optical path length between 850-5180km, and path is less than to the optical channel of 850km, then adopt the modulation format of 16QAM.Such as, if one the length of optical channel is 3000km, traditional discretization modulation format selection mode can only select QPSK (its BS=2bit/ symbol) to modulate this optical channel, is 112Gb/s according to the wire rate that formula (2) calculates this light logical.But this selection mode will inevitably cause the very large waste of spectral bandwidth, because modulate for independent QPSK, its supported maximum transmission distance can reach 5118km.On the contrary, if we use QPSK & 16QAM (p
1, p
2) TDHM technology carry out light modulated passage, known by Fig. 2, corresponding to the optical transport distance of 3000km, we can the spectrum efficiency of maximum acquisition BS=2.27bit/ symbol, and its wire rate can reach 127.12Gb/s.Therefore, compared with the modulation format selection scheme of traditional discretization, the modulation scheme based on TDHM technology can increase by the transmission capacity of about 13.5%.
It should be noted that, in order to assess TDHM technology improving the advantage in optical-fiber network efficiency of transmission, the invention also discloses a kind of appraisal procedure based on integral linear programming model and an appraisal procedure based on the heuritic approach in popin face.
1, based on the ILP integer linear Optimal Design of TDHM network.
In order to assess the performance of TDHM technology, assuming that the wavelength capacities on every root physical fiber link is given (wavelength resource is limited), our optical-fiber network optimal design is intended to maximization network total transmission capacity or spectrum efficiency.First, we suppose that optical service matrix is known given (being different from the service conditions that arrives at random dynamically), consider route symmetry (the Routing and wavelength assignment-RWA) planning problem under the most basic static traffic load in WDM, follow the Wavelength continuity constraint condition of transparent optical networks, we have proposed the ILP model that solves RWA problem.The set (Sets) of this ILP model, parameter (Parameters), variable (Variables) and target function (Objectivefunction), restrictive condition (Constraints) is described as follows:
Set (Sets):
| L | Represent the set of all links in network |
| D | Represent the set that in network, all nodes are right |
| R d | Represent that node is to the optical routing set of d |
| W | Represent the wavelength set that every root optical fiber can carry |
Parameter (Parameters):
Variable (Variables):
Target function (Objective):
Target function is intended to the transmission capacity of maximization network, and this transmission capacity is not only determined by the optical channel number successfully set up, also relevant with the wire rate size of every bar optical channel.The optical channel number that success is set up is more, and the wire rate of every bar optical channel is larger, and the transmission capacity of network is larger.
Constraints (Constraints):
Namely require that the traffic carrying capacity that each node completes is less than given traffic carrying capacity requirement
A traffic carrying capacity correspondence uses a wavelength resource, finally accounts for on node d path r
The traffic carrying capacity that just equaled of wavelength sum
Namely any one wavelength on any link can only serve a business
Although 2 ILP models are with thinking that Solution To The Network goes out optimized design result, but its computational complexity makes it to other networks beyond mininet and infeasible, in order to effectively address this problem, we have proposed a kind of heuritic approach based on popin face.
Step 1: read in a network topological diagram, produces corresponding W parallel popin face according to the wavelength number W that every bar optical fiber carries simultaneously.
Step 2: adopt Dijksrtra shortest route algorithm to be each node between physically based deformation distance find shortest path R.
Step 3: a given service request, all popin faces uses Dijksrtra algorithm therefrom find a shortest path P.If successfully to find and its optical path distance is less than 5118km (i.e. lowest modulation form QPSK support maximum transmission distance), move to step 4; Otherwise business is blocked.
Step 4: compare the path R obtained respectively by step 2 and step 3 and whether equal P, if equal, then calculate this light path wire rate and for the corresponding wavelength of this traffic assignments; Otherwise, find out in all popin faces based on the minimum route of jumping figure (hops) for this business and calculate its wire rate and distribute wavelength.
Step 5: be all business repeated execution of steps 3-4.
Step 6: the optical channel number of all foundation in statistics network and total transmission capacity.
The network transmission capacity comparison diagram under different Adjusted Option is shown see Fig. 4 and Fig. 5.Here, have 16 wavelength on the every bar optical fiber link of small-sized n6s9 network settings of 6 node 9 links, and set in USNET on every bar optical fiber link and have 80 wavelength.QPSK & 16QAM (p1, p2) based on TDHM modulation technique is used to the transmission of carry data signals.For ILP model, use K-Shortest algorithm each node between find at most three routes as its alternate routing set, all routes in route set all require that it is less than 5118km (maximum transmission distance that the lowest modulation form QPSK namely selected in the present embodiment supports).Shown in ILP solving result all based on 64, the server of CPU and the 8-G internal memory of 2.4GHz, adopt AMPL/Gurobi software kit 5.0.0 version.The MIPGAP of this ILP model is set to 0.01%.In order to Performance comparision, we have also contemplated that based on the Wavelength Assignment scheme of simple fixing shortest route selection with initial hit (first-fit).Meanwhile, we also compare the traditional performance of discretization rate adaptation strategy in different schemes.All emulation testings are all based on the optical transmission system at fixing 28G symbol/second baud rate and 50GHz fixed frequency spectrum interval.
Fig. 4 and Fig. 5 compares the network transmission capacity difference under different designs scheme.Simulation result shows, (such as only consider pure QPSK and 16QAM modulation format in this example) compared with traditional discretization modulation format selection strategy, the scheme based on TDHM technology can significantly improve the transmission capacity of network, reaches as high as 40%.This difference be obviously easily see because TDHM technology has larger flexibility ratio in the spectrum efficiency regulating optical channel and transmission range.Meanwhile, the ILP linear optimization model that we propose all is better than simply based on Route Selection and the first-fit Wavelength Assignment scheme of shortest path with the performance based on the heuritic approach in popin face.This is because the latter always attempts using shortest path to set up optical channel for each service request, wavelength resource on some link will certainly be increased and use too frequent, cause the very big increase of blocking rate; And our ILP model and ripple Plat algorithm can be each request consideration many available alternative routes, when the wavelength resource in shortest route is deficient, the path that we can select distance longer from route set attempts setting up optical channel, and the method effectively can reduce the blocking rate of optical channel.Finally, it is very close with the optimized results of ILP model based on the heuritic approach result in popin face that simulation result also shows that we propose, and demonstrates the high efficiency of algorithm from another point of view.
A kind of structural representation improving an embodiment of the device of optical-fiber network efficiency of transmission of the present invention is shown see Fig. 6.
As shown in Figure 6, this device comprises:
Information acquisition unit 1, for obtaining the optical transport distance of optical channel.
Spectrum efficiency determining unit 2, for according to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determines optical passage signal transmission spectrum efficiency.
Occupation rate determining unit 3, for according to the spectrum efficiency of unlike signal modulation format and the Signal transmissions spectrum efficiency of described optical channel, determine the occupation rate of unlike signal modulation format in optical transport frame, this optical transport frame at least comprises modulation format in two.
Optionally, the information gathering subelement in occupation rate determining unit obtains the spectrum efficiency of unlike signal modulation format.And then computation subunit is according to computing formula BS=∑
i ∈ Qp
ibS
i, calculate the occupation rate of unlike signal modulation format in optical transport frame.
Wherein, p
icorrespond to particular modulation format probability in a frame, BS
ithe spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.
Modulating unit 4, for utilizing unlike signal modulation format occupation rate in the frame structure, setting up time domain hybrid modulation transmission frame, modulating optical channel.
Optionally, in other embodiments of the invention, this device also can comprise assessment unit for building integral linear programming model, assesses the optical channel after modulation or utilizes the heuritic approach in popin face, assesses the optical channel after modulation.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. for improving a method for optical-fiber network efficiency of transmission, it is characterized in that, comprising:
Obtain the optical transport distance of optical channel;
According to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determine the Signal transmissions spectrum efficiency of optical channel;
According to the spectrum efficiency of unlike signal modulation format and the Signal transmissions spectrum efficiency of described optical channel, determine the occupation rate of unlike signal modulation format in optical transport frame, described optical transport frame at least comprises two kinds of format modulation signals;
Utilize unlike signal modulation format occupation rate in optical transport frame, set up time domain hybrid modulation transmission frame, optical channel is modulated.
2. method according to claim 1, is characterized in that, the described spectrum efficiency according to unlike signal modulation format and described optical passage signal transmission spectrum efficiency, determines to comprise the probability that unlike signal modulation format occupies in optical transport frame:
Obtain the spectrum efficiency of unlike signal modulation format;
According to computing formula BS=∑
i ∈ Qp
ibS
i, calculate unlike signal modulation format institute's occupation rate in the frame structure;
Wherein, p
icorrespond to particular modulation format probability in a frame, BS
ithe spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.
3. method according to claim 1, is characterized in that, describedly utilizes the occupation rate of unlike signal modulation format in optical transport frame, sets up time domain hybrid modulation transmission frame, modulates, also comprise afterwards optical channel:
Build integral linear programming model, the optical channel after modulation is assessed.
4. method according to claim 1, is characterized in that, describedly utilizes the occupation rate of unlike signal modulation format in optical transport frame, sets up time domain hybrid modulation transmission frame, modulates, also comprise afterwards optical channel:
Utilize the heuritic approach in popin face, the optical channel after modulation is assessed.
5. for improving a device for optical-fiber network efficiency of transmission, it is characterized in that, comprising:
Information acquisition unit, for obtaining the optical transport distance of optical channel;
Spectrum efficiency determining unit, for according to the preset relation of described optical transport distance with optical passage signal transmission spectrum efficiency, determines optical passage signal transmission spectrum efficiency;
Occupation rate determining unit, for according to the spectrum efficiency of unlike signal modulation format and described optical passage signal transmission spectrum efficiency, determine unlike signal modulation format occupation rate in optical transport frame, described optical transport frame at least comprises two kinds of modulation formats;
Modulating unit, for utilizing the occupation rate of unlike signal modulation format in optical transport frame, setting up time domain hybrid modulation transmission frame, modulating optical channel.
6. device according to claim 5, is characterized in that, described occupation rate determining unit comprises:
Information gathering subelement, obtains the spectrum efficiency of unlike signal modulation format;
Computation subunit, for according to computing formula BS=∑
i ∈ Qp
ibS
i, calculate the occupation rate of unlike signal modulation format in optical transport frame;
Wherein, p
icorrespond to particular modulation format probability in a frame, BS
ithe spectrum efficiency of this kind of modulation format, all modulation format set of Q for comprising in a frame.
7. device according to claim 5, is characterized in that, described device also comprises: assessment unit, for assessing the optical channel after modulation.
8. device according to claim 7, is characterized in that, described assessment unit, for building integral linear programming model, assesses the optical channel after modulation.
9. device according to claim 7, is characterized in that, described assessment unit, for utilizing the heuritic approach in popin face, assesses the optical channel after modulation.
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| CN105915310A (en) * | 2016-04-18 | 2016-08-31 | 全球能源互联网研究院 | WDM optical network RWA comprehensive optimization method based on ant colony algorithm |
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