CN105471732B - A kind of RSA methods that SDN controllers and physical damnification in optical-fiber network perceive - Google Patents
A kind of RSA methods that SDN controllers and physical damnification in optical-fiber network perceive Download PDFInfo
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- CN105471732B CN105471732B CN201510821524.1A CN201510821524A CN105471732B CN 105471732 B CN105471732 B CN 105471732B CN 201510821524 A CN201510821524 A CN 201510821524A CN 105471732 B CN105471732 B CN 105471732B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/122—Shortest path evaluation by minimising distances, e.g. by selecting a route with minimum of number of hops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/124—Shortest path evaluation using a combination of metrics
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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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Abstract
The present invention provides the RSA methods that the SDN controllers in a kind of optical-fiber network and physical damnification perceive, it is related to technical field of photo communication.Lesion assessment module is introduced in SDN controllers by the SDN controllers of the present invention, and the Match Fields rules of the stream entry of SDN controller southbound interface OpenFlow agreements are extended；The RSA methods that the physical damnification of the present invention perceives include the following steps：The service request for reaching optical-fiber network is sent to stream analyzer, stream analyzer and obtains current network state information；Path calculation module calculates K bar light paths according to current network state for the request；K bar light paths are sent to lesion assessment module and carry out physical layer damage assessment, and select the light path resource for meeting QoT requirements, establish connection.The present invention more comprehensively considers physical layer damage, after route and frequency spectrum assigning process have been carried out for business, is transmitted the quality judging of signal, ensure that QoT.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to SDN controllers and thing in a kind of software definition optical-fiber network
The route that reason damage perceives and frequency spectrum distribution (RSA) method.
Background technology
With the transparent transmission in optical signal all-optical network, optical-electrical-optical (OEO) converter is gradually from the core of optical-fiber network
Node exits.Due to no regeneration device, irrational device and equipment such as optical cross-connect (OXC), er-doped light in area of light
The linear nonlinear physics between physical damnification and signal such as dispersion, noise and the power attenuations of generation such as fiber amplifier (EDFA)
The transmission quality (QoT) of optical signal can be reduced by damaging the deterioration to optical signal quality；And this deterioration will be continuous along light path
Accumulation, ultimately results in the rise of the bit error rate of optical signal, when QoT is reduced to below user demand value, will be unable to guarantee business
To the demand of transmission quality.RSA Algorithm, can be according to user's as the light path resource distribution technique in software definition optical-fiber network
Actual demand reasonably distributes the light path resource of corresponding different optical signal qualities.Therefore, in software definition optical-fiber network, how
The RSA Algorithm perceived in control plane using physical damnification evades physical damnification, improves the QoT of transmission signal, becomes software
Define a main direction of studying of optical-fiber network.
In addition, in optical-fiber network, in order to ensure the quality of transmission signal, evade physical layer damage, in RSA assigning process
The distance between different rates signal is increased by setting protection bandwidth, carries out resource allocation.Low-rate signal can be to height
Rate signal produces the damage of serious Cross-phase Modulation (XPM), when two-forty signal due to be subject to physical damnification influenced without
When can establish light path, by using upset multiplexing technology, two-forty signal is split into some low-rate signals at source node
It is transmitted, and is converged the low-rate signal of fractionation at destination node.So as to avoid physical layer damage, the company of reducing
Connect blocking rate.But this method for evading physical layer damage can take extra frequency spectrum resource, cause resource utilization to reduce.
The content of the invention
Present invention is primarily intended to provide SDN controllers and physical damnification sense a kind of optical-fiber network suitable for software definition
The route and frequency spectrum distributing method known.This method is considered by being extended to control plane, and damage is added in SDN controllers
Evaluation module, more comprehensively considers physical layer damage, after route and frequency spectrum assigning process have been carried out for business, is transmitted
The quality judging of signal, so as to ensure that QoT.
To solve foregoing invention purpose, the present invention is achieved through the following technical solutions.
A kind of SDN controllers in optical-fiber network, including stream analyzer, path calculation module, lesion assessment module and flow
Engineering data base；
The stream analyzer receives external business request, and current network state is obtained from traffic engineering database
Afterwards, service request and current network state are sent to path calculation module；Stream analyzer receives what lesion assessment module was sent
After connecting light path, the current network state of traffic engineering database is updated, and connection light path is passed through into expansion in the form of stream entry
Exhibition OpenFlow agreements externally export；
The path calculation module calculates K bar light paths according to current network state for service request, by K bar light path roots
It is numbered to obtain the 1st to the K articles light path according to path distance, all light paths is sent to lesion assessment module；Wherein, K is certainly
So number；
The lesion assessment module is the Calculation of Optical Path physical layer damage, will meet physical layer damage requirement and path distance
Shortest light path is sent to stream analyzer as connection light path.
Wherein, the extension OpenFlow agreements are specially：Added in the Match Fields domains of OpenFlow agreements
Predetermined threshold value, matched rule of the predetermined threshold value as the Match Fields domains of OpenFlow agreements.
Wherein, it is described that K articles of light path is numbered according to path distance to obtain the 1st to the K articles light path, be specially：By K
Article light path is numbered to obtain the 1st to the K articles light path from small to large according to path distance.
Wherein, lesion assessment module is the Calculation of Optical Path physical layer damage, will meet physical damnification requirement and path distance is most
Short light path is sent to stream analyzer as connection light path, is specially：The physical layer damage of the 1st article of light path is calculated, and with presetting
Threshold value comparison, if physical layer damage is less than predetermined threshold value, sends the light path as connection light path to stream analyzer；It is no
Then, the physical layer damage of next light path is calculated, by the physical layer damage compared with predetermined threshold value, until the K articles light path, if
The physical layer damage of the K articles light path is more than or equal to predetermined threshold value, then all light paths are unavailable.
Wherein, the lesion assessment module is specially：By amplified spontaneous emission, crosstalk, polarization mode dispersion, cross-phase
Modulation and four-wave mixing are converted into damage model, and the physical layer damage of i-th light path is calculated according to damage model；Wherein, 1≤i
≤ K, the calculation formula of damage model are：
Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T,
B0For filter bandwidht, T is symbol time, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz,
OSNR is optical signal to noise ratio.
A kind of RSA methods that physical damnification perceives in optical-fiber network, this method comprises the following steps：
(1) optical-fiber network receives service request, by all stream entries in the interchanger of the service request and optical-fiber network
Matching domain is matched, if stream entry can it is matched when, then terminate flow；If no stream entry matches with it,
Then interchanger sends the service request to SDN controllers；
(2) service request that the stream analyzer desampler of SDN controllers is sent, and from traffic engineering database
Current network state is obtained, service request and current network state are sent to path calculation module；
(3) path calculation module utilizes shortest-path rout ing algorithms and initial hit frequency spectrum point according to current network state
It is service request distribution route and frequency spectrum resource with algorithm, obtains K bar light paths；
(4) K articles of light path is numbered after obtaining the 1st to the K articles light path according to path distance, by the 1st to the K articles light path
Send to lesion assessment module；Wherein, K is natural number；
(5) lesion assessment module carries out physical layer damage calculating to light path, and will meet physical layer damage requirement and path
Sent apart from shortest light path as connection light path to stream analyzer；
(6) after stream analyzer receives connection light path, the current network state of traffic engineering database is updated, and will connection
Light path is sent to the interchanger of optical-fiber network in the form of stream entry by extending OpenFlow agreements；
Complete the route and frequency spectrum assigning process of the service request.
Wherein, K articles of light path is numbered according to path distance in the step (4) to obtain the 1st to the K articles light path
Afterwards, the 1st to the K articles light path is sent to lesion assessment module, is specially：By K bars light path according to path distance from small to large into
After row number obtains the 1st to the K articles light path, the 1st to the K articles light path is sent to lesion assessment module.
Wherein, the formula of physical layer damage calculating is in the step (5)：
Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T,
B0For filter bandwidht, T is symbol time, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz,
OSNR is optical signal to noise ratio.
Wherein, lesion assessment module carries out physical layer damage calculating to light path in the step (5), and will meet physics
Layer damage requires and the shortest light path of path distance is sent to stream analyzer as connection light path, is specially：Lesion assessment module
Physical layer damage calculating is carried out to the 1st article of light path, and compared with predetermined threshold value, if physical layer damage is less than predetermined threshold value,
Sent the light path as connection light path to stream analyzer；Otherwise, the physical layer damage of next light path is calculated, by the physical layer
Damage is compared with predetermined threshold value, until the K articles light path, if the physical layer damage of the K articles light path is more than or equal to predetermined threshold value,
All light paths are unavailable.
Wherein, extension OpenFlow agreements are specially in the step (6)：In the Match of OpenFlow agreements
Add predetermined threshold value, matched rule of the predetermined threshold value as the Match Fields domains of OpenFlow agreements in Fields domains.
The present invention has the following advantages that compared to background technology：
(1) lesion assessment module is introduced to by SDN controllers provided by the invention by being extended to control plane
In SDN controllers, physical layer damage is more comprehensively considered；
(2) present invention to the Match Fields rules of the stream entries of SDN controller southbound interface OpenFlow agreements into
Row extension, to complete after route and frequency spectrum assigning process have been carried out for business, is transmitted the quality judging of signal, so as to protect
QoT is demonstrate,proved.
(3) the K bars light path calculated is transmitted matter by the present invention by the lesion assessment module extended in SDN controllers
Amount judges, to pick out a light path for meeting transmission quality requirements, improves transmission signal quality, reduces blocking rate.
Brief description of the drawings
Fig. 1 is the SDN controller schematic diagrames of the present invention；
Fig. 2 is the extension OpenFlow agreement schematic diagrames of the present invention；
Fig. 3 is the path provisioning process figure of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
As shown in Figure 1, the present invention a kind of optical-fiber network in SDN controllers, including stream analyzer, path calculation module,
Lesion assessment module and traffic engineering database.Only marked and path computing and lesion assessment in SDN controllers shown in Fig. 1
Relevant module, other are not specifically stated without the basic function module called.The present invention damages multiple physical layers, such as puts
Big spontaneous radiation, crosstalk, polarization mode dispersion, Cross-phase Modulation, four-wave mixing etc. are converted into damage model, are configured to damage
Evaluation module.And lesion assessment module is introduced in SDN controllers, meanwhile, in order to support to lesion assessment module results
Judge, the matched rule of SDN southbound interface OpenFlow agreements is extended.
Stream analyzer receives external business request, and from traffic engineering database after acquisition current network state, by industry
Business request and current network state are sent to path calculation module；Stream analyzer receives the connection light path that lesion assessment module is sent
Afterwards, the current network state of traffic engineering database is updated, and connection light path is passed through into extension in the form of stream entry
OpenFlow agreements send the adaptive-bandwidth optical cross-connect into optical-fiber network；OpenFlow agreements schematic diagram such as Fig. 2 is extended,
Extending OpenFlow agreements is specially：BER is added in the Match Fields domains of OpenFlow agreementsthreshold, should
BERthresholdIt is worth the matched rule in the MatchFields domains as OpenFlow agreements.
Path calculation module calculates K bar light paths according to current network state for service request, by K bar light paths according to path
Distance is numbered to obtain the 1st to the K articles light path from small to large, and all light paths are sent to lesion assessment module；Wherein, K is
Natural number；
Whether lesion assessment module carries out physical layer damage assessment to the 1st article of light path, judge physical layer damage in regulation model
In enclosing, if physical layer damage is less than predetermined threshold value BERthreshold, illustrate that the damage effect of the light path is not serious, will not be to light
Signal causes to seriously affect, which is available, is sent the light path as connection light path to stream analyzer；Otherwise, explanation
The light path can seriously affect the quality of transmission optical signal, which is disabled, then calculate the physical layer damage of next light path
Wound, repeats lesion assessment process above.If until the K articles light path is all unsatisfactory for damage threshold, obstruction connection.In the present invention
BERthresholdValue takes 10-6。
, will significantly when deterioration reaches a certain level since physical layer damage produces deterioration to transmission optical signal quality
The quality of optical signal is reduced, makes the bit error rate (BER) of receiving terminal very high, when the bit error rate is optionally greater than the bit error rate set by receiving terminal
During threshold value, show that this light path is unsatisfactory for transmission signal quality requirement.The calculation formula of the physical layer damage of i-th light path is：1
≤ i≤K,
Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T,
B0For filter bandwidht, T is symbol time, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz,
OSNR is optical signal to noise ratio.
The present invention is using the 5th adaptive-bandwidth optical cross-connect (OF-BV-OXC) as source node, the 1st OF-BV-OXC
As a purpose exemplified by node, when service request reaches optical-fiber network, Fig. 3 is the process that light path is established for the service request.Specifically
In implementation process, the RSA methods of physical damnification perception, include the following steps in a kind of optical-fiber network：
(1) optical-fiber network receives service request, by adaptive-bandwidth optical cross-connect in the service request and optical-fiber network
The matching domains of all stream entries matched, when can be matched if stream entry, then terminate flow；If do not flow bar
Mesh matches with it, then adaptive-bandwidth optical cross-connect sends an OFPT_FLOW_MOD information to SDN controllers, such as 1.
It is shown；
(2) stream analyzer of SDN controllers receives the service request from adaptive-bandwidth optical cross-connect, and from flow
Current network state is obtained in engineering data base, it is such as 2. shown, connectivity request message and current network state are sent to path
Computing module, it is such as 3. shown；
(3) path calculation module is according to current network state, using shortest-path rout ing algorithms (Dijkstra) and first
Frequency spectrum allocation algorithm (First Fit) is hit as service request distribution route and frequency spectrum resource, obtains K bar light paths；
(4) K bars light path is numbered from small to large according to path distance, numbering be followed successively by 1,2 ..., K, obtain the 1st to
After the K articles light path, the 1st to the K articles light path is sent to lesion assessment module；Wherein, K is natural number；
(5) lesion assessment module carries out physical layer damage calculating to light path, and will meet physical layer damage requirement and number
Minimum light path is sent to stream analyzer as connection light path；Specially：
Lesion assessment module carries out the 1st article of light path physical layer damage calculating, and with predetermined threshold value BERthresholdCompare,
If physical layer damage is less than BERthreshold, then sent the light path as connection light path to stream analyzer；Otherwise, under calculating
The physical layer damage of one light path, by the physical layer damage and BERthresholdCompare, until the K articles light path, if the K articles light
The physical layer damage on road is more than or equal to BERthreshold, then all light paths are unavailable；It is such as 4. shown.
The calculation formula of the physical layer damage of i-th light path is：1≤i≤K,
Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T,
B0For filter bandwidht, T is symbol time, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz,
OSNR is optical signal to noise ratio.
(6) after stream analyzer receives connection light path, the current network state of traffic engineering database is updated, and will connection
Light path sends the adaptive-bandwidth optical cross-connect into optical-fiber network in the form of stream entry by extending OpenFlow agreements, such as
It is 5. shown；
Extending OpenFlow agreements is specially：Predetermined threshold value is added in the Match Fields domains of OpenFlow agreements, should
Matched rule of the predetermined threshold value as the Match Fields domains of OpenFlow agreements.
Complete the route and frequency spectrum assigning process of the service request.
Particular embodiments described above, has carried out the purpose of the present invention, technical solution and beneficial effect further in detail
Describe in detail it is bright, it should be understood that the foregoing is merely the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done, should be included in the guarantor of the present invention
Within the scope of shield.
Claims (6)
1. the software defined network SDN controllers in a kind of optical-fiber network, including stream analyzer, path calculation module and traffic engineering
Database, it is characterised in that：Lesion assessment module is further included,
The stream analyzer receives external business request, and from traffic engineering database after acquisition current network state, will
Service request and current network state are sent to path calculation module；Stream analyzer receives the connection light that lesion assessment module is sent
Lu Hou, updates the current network state of traffic engineering database, and connection light path is passed through extension in the form of stream entry
OpenFlow agreements externally export；
The path calculation module calculates K bar light paths according to current network state for service request, by K bar light paths according to road
Footpath distance is numbered to obtain the 1st to the K articles light path, and all light paths are sent to lesion assessment module；Wherein, K is natural number；
The lesion assessment module is the Calculation of Optical Path physical layer damage, will meet physical layer damage requirement and path distance is most short
Light path as connection light path send to stream analyzer；
The extension OpenFlow agreements are specially：Predetermined threshold value is added in the Match Fields domains of OpenFlow agreements,
Matched rule of the predetermined threshold value as the Match Fields domains of OpenFlow agreements；
The lesion assessment module is specially：By amplified spontaneous emission, crosstalk, polarization mode dispersion, Cross-phase Modulation and four
Wave mixing is converted into damage model, and the physical layer damage of i-th light path is calculated according to damage model；Wherein, 1≤i≤K, damage
The calculation formula of model is：
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Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T, B0For filter
Ripple device bandwidth, T are symbol times, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz, OSNR are light
Signal-to-noise ratio.
2. the software defined network SDN controllers in a kind of optical-fiber network according to claim 1, it is characterised in that：It is described
K articles of light path is numbered according to path distance obtain the 1st to the K articles light path, be specially：By K bars light path according to path away from
From being numbered to obtain the 1st to the K articles light path from small to large.
3. the software defined network SDN controllers in a kind of optical-fiber network according to claim 2, it is characterised in that：Damage
Evaluation module is the Calculation of Optical Path physical layer damage, will meet physical damnification requirement and the shortest light path of path distance is as connection light
Road is sent to stream analyzer, is specially：The physical layer damage of the 1st article of light path is calculated, and compared with predetermined threshold value, if physical layer
Damage is less than predetermined threshold value, then is sent the light path as connection light path to stream analyzer；Otherwise, the thing of next light path is calculated
Layer damage is managed, by the physical layer damage compared with predetermined threshold value, until the K articles light path, if the physical layer damage of the K articles light path
More than or equal to predetermined threshold value, then all light paths are unavailable.
4. the route that physical damnification perceives in a kind of optical-fiber network and frequency spectrum distribution RSA methods, it is characterised in that including following step
Suddenly：
(1) optical-fiber network receives service request, by the matching of all stream entries in the interchanger of the service request and optical-fiber network
Domain is matched, if stream entry can it is matched when, then terminate flow；If no stream entry matches with it, hand over
Change planes and send the service request to SDN controllers；
(2) service request that the stream analyzer desampler of SDN controllers is sent, and obtained from traffic engineering database
Current network state, service request and current network state are sent to path calculation module；
(3) path calculation module is calculated according to current network state using shortest-path rout ing algorithms and the distribution of initial hit frequency spectrum
Method is service request distribution route and frequency spectrum resource, obtains K bar light paths；
(4) K articles of light path is numbered after obtaining the 1st to the K articles light path according to path distance, the 1st to the K articles light path is sent
To lesion assessment module；Wherein, K is natural number；
(5) lesion assessment module carries out physical layer damage calculating to light path, and will meet physical layer damage requirement and path distance
Shortest light path is sent to stream analyzer as connection light path；
(6) after stream analyzer receives connection light path, the current network state of traffic engineering database is updated, and light path will be connected
Sent in the form of stream entry by extending OpenFlow agreements to the interchanger of optical-fiber network；
Complete the route and frequency spectrum assigning process of the service request；
Extension OpenFlow agreements are specially in the step (6)：In the MatchFields domains of OpenFlow agreements, addition is pre-
If threshold value, matched rule of the predetermined threshold value as the Match Fields domains of OpenFlow agreements；
The formula of physical layer damage calculating is in the step (5)：
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Wherein, BER is the bit error rate,Wherein, M represents receiver sensitivity, and M=2B0T, B0For filter
Ripple device bandwidth, T are symbol times, and unit is ps；ρ=nBrefTOSNR, wherein, n=2, Bref=12.5GHz, OSNR are light
Signal-to-noise ratio.
5. the route that physical damnification perceives in a kind of optical-fiber network according to claim 4 and frequency spectrum distribution RSA methods, it is special
Sign is, K articles of light path is numbered after obtaining the 1st to the K articles light path according to path distance in the step (4), by the 1st
Sent to the K articles light path to lesion assessment module, be specially：K bars light path is numbered from small to large according to path distance
To after the 1st to the K articles light path, the 1st to the K articles light path is sent to lesion assessment module.
6. the route that physical damnification perceives in a kind of optical-fiber network according to claim 5 and frequency spectrum distribution RSA methods, it is special
Sign is that lesion assessment module carries out physical layer damage calculating to light path in the step (5), and will meet physical layer damage
It is required that and the shortest light path of path distance sent as connection light path to stream analyzer, be specially：Lesion assessment module is to the 1st article
Light path carries out physical layer damage calculating, and compared with predetermined threshold value, if physical layer damage is less than predetermined threshold value, by the light path
Sent as connection light path to stream analyzer；Otherwise, the physical layer damage of next light path is calculated, by the physical layer damage and in advance
If threshold value comparison, until the K articles light path, if the physical layer damage of the K articles light path is more than or equal to predetermined threshold value, all light paths
It is unavailable.
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| CN109962735B (en) * | 2019-03-11 | 2021-04-27 | 烽火通信科技股份有限公司 | Method and system for adapting optical power parameters |
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