CN107835046A - A kind of method for routing - Google Patents
A kind of method for routing Download PDFInfo
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- CN107835046A CN107835046A CN201711362979.7A CN201711362979A CN107835046A CN 107835046 A CN107835046 A CN 107835046A CN 201711362979 A CN201711362979 A CN 201711362979A CN 107835046 A CN107835046 A CN 107835046A
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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
- H04L45/62—Wavelength based
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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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
- H04L45/02—Topology update or discovery
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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
- H04L45/30—Routing of multiclass traffic
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- Computer Networks & Wireless Communication (AREA)
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- Astronomy & Astrophysics (AREA)
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Abstract
Present invention is disclosed a kind of method for routing, compared to existing technology, the application uses LEO/MEO double-layer satellite architectures, by LEO satellite Space expanding zoning, and routing update is carried out in region, interregional routing update and information transfer are responsible for by MEO satellite, improve the convergence rate of algorithm renewal route；By the wavelength collection for different traffic assignments varying numbers, meet different business needs；Link weight considers wavelength remainder and propagation delay time, and dynamic changes link weight；Wavelength conflict degree is considered simultaneously, it is determined that other nodes are considered during route in the future to the occupancy situation of wavelength, so as to delay from the big link of Wavelength conflict degree.The present invention can realize the reasonable utilization of Network Load Balance and resource, improve satellite optical network medium wavelength utilization rate, meet the communication requirement of different business, while substantially reduce the blocking rate of network.
Description
The application is that application number 2017100541843, the applying date 2017 year 01 month 24, denomination of invention " are based on multi-service
Satellite all-optical network Wavelength routing method " divisional application.
Technical field
The invention belongs to satellite optical communication field, specifically a kind of method for routing.
Background technology
With meteorological, remote sensing and the continuous expansion of military field application demand, new want is proposed to communication technology of satellite
Ask.In addition to transmitting traditional remote measurement, remote-control data, it is also necessary to a variety of differences such as transmitted in both directions video, audio, scientific experiment
The data of type, transmitted data amount is big, from several bit/s to hundreds of million bit/s.Traditional microwave type satellite is difficult to meet skill
The requirement of art development, laser link formula satellite has big message capacity, low in energy consumption, confidentiality and survivability strong and technology innovation
It hurry up, the advantage such as cost is low, can be good at the growth requirement for meeting satellite communication, turn into the focus studied now.
In satellite optical network, the difficult point of research is Wavelength routing problem, i.e. the distribution RWA problems of wavelength and route, is moved
The RWA problems of state have proven to NP-hard problems.How using the advantage of double-layer satellite architecture and according to full light
The advantages that Netowrk tape is roomy, low in energy consumption and survivability is strong, the satellite all-optical network Wavelength routing side established under double-layer satellite structure
Method is urgent problem.
The content of the invention
In view of the shortcomings of the prior art, the present invention combines MEO/LEO satellite constellation features, proposes a kind of method for routing.Should
Link weight during method routing considers time delay, wavelength available number factor, while introduces Wavelength conflict degree mechanism, so that
Satellite network node load balancing, reduce node pressure, while reduce the blocking rate of network node, improve wavelength utilization rate,
Meet the communication requirement of different business.
For certainly solution satellite optical network Wavelength routing problem, the technical proposal of the invention is realized in this way：A kind of route side
Method, specifically include：
S1：Collect LEO/MEO satellite parametric reductions:Orbit altitude h, pitching angle theta, satellite ephemeris parameter, by calculating LEO, MEO
The method of distance between sub-satellite point, and " substar distance is most short " principle, the network topology established between LEO and MEO
Structure, determine that LEO satellite establishes link with unique MEO satellite, by LEO satellite zoning；
S2：According to type of service divided rank, service priority collection F={ f are determined1,f2,…,fm}；
S3：The number of wavelengths of satellite is counted, with service priority F={ f1,f2,…,fmWavelength sub-clustering, formation wavelength are divided
Gathering closes C={ c1,c2,…,ck, and make m=k；Highest priority traffic is set to possess the wavelength cluster of maximum, you can to use number of wavelengths
At most；Wavelength available has common factor between cluster and cluster, improves wavelength utilization rate；
S4：With wavelength available number and time delay initialization link weight C0(u, v), wherein u, v are satellite node；
S5：K bar critical paths are determined, link weight uses initial weight C0(u,v)；
S6：K bar critical paths link weight adjustment based on Wavelength conflict degree, when it is determined that, it is necessary to again after critical path
Critical link weight in network is set, critical link weight is divided into two parts, initial weight and Wavelength conflict degree；
S7：Link weight and minimum path is selected to establish route from the K bar critical paths after adjustment weight, and with industry
Business priority is that foundation distributes wavelength in corresponding wavelength cluster；
S8：Network topology structure is updated, recalculates link weight.
Further, when establishing satellite network topology in step S1, with " substar distance is most short " for principle, uniquely determine
The satellite that LEO accesses to MEO, ensure that LEO satellite is connected with a unique MEO satellite, and space length between the two
It is most short, reduce propagation delay time.
Further, it is specially according to type of service divided rank in step S2：
1. being divided according to business to delay sensitive degree, the business high to delay requirement has higher priority, will to time delay
Relatively low business is asked to have relatively low priority；2. arrange to divide according to service quality, it is different according to user class, possess different
Service quality, the different priority of division business；3. being divided according to business significance level, relatively important business has higher
Priority, and general business has relatively low priority.
Further, during the sub-clustering of step S3 medium wavelengths, in wavelength sub-clustering set wavelength available number using service priority as pair
It should reduce successively, each wavelength cluster medium wavelength can have common factor, improve wavelength utilization rate.
Further, step S4 links initial weight calculation formula is：
Wherein, λ (u, v) be link (u, v) remaining number of wavelengths, λmaxFor current network link link residue number of wavelengths
Maximum, the weight of the maximum link of remaining number of wavelengths is 1 in network, and link residue number of wavelengths is smaller, and respective weights are got over
Greatly.D (u, v) be link (u, v) propagation delay time, DminFor the minimal time delay of all links, α1With β be link weight adjust because
Son.
Further, step S5 uses Dijkstra shortest-path methods, solves K bar shortest paths, takes K=3-4.
Further, step S6 medium wavelengths conflict degree calculation formula is：
Wherein
In formula, (s ', d ') is a certain (S, D) node pair, and (s, d) is (S, D) node pair of current business flow request, and P is
The set of all (S, D) nodes pair, p=| P | it is the number of element in set P, SETi(s'd') it is i-th pass of (s ', d ')
Key path, εi(s'd') increment of path weight value is represented；μ is symbol logo, when the wavelength of (s ', d ') and (s, d) application is identical
When, μ=1；When the wavelength difference of (s ', d ') and (s, d) application, μ=- 1.
It is as critical path link weight calculation formula further, is changed：
, wherein α1、β、α2Respectively remaining number of wavelengths, time delay, Wavelength conflict degree weight regulatory factor.
The present invention can obtain following technique effect due to using above technical scheme：Compared to prior art, this hair
Bright satellite all-optical network Wavelength routing method combination MEO/LEO double-layer satellite optical network features, will using MEO as regional managers
LEO zonings, LEO has unique MEO satellite corresponding in each region, and routing update is carried out in region, so as to
Route switching is reduced, improves routing convergence speed, and by wavelength sub-clustering, makes wavelength cluster corresponding with service priority collection, raising
Wavelength utilization rate.On this basis, consider link wavelength remainder and propagation delay time, calculate initial link circuit weight, simultaneously
Consider influence of the Wavelength conflict degree to critical path link weight, be updated foundation route.
The present invention can realize the reasonable utilization of Network Load Balance and resource, improve the utilization of satellite optical network medium wavelength
Rate, meets the communication requirement of different business, while substantially reduces the blocking rate of network, is research and the hair of satellite all-optical network
Exhibition provide advantageously with efficient Wavelength routing algorithm.
Brief description of the drawings
The shared width of accompanying drawing 1 of the present invention：
Fig. 1 is satellite all-optical network Wavelength routing method flow chart；
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings with specific embodiment pair
The present invention is described in detail.
MEO/LEO double layer minipellet topological structures are established, according to the orbit parameter of satellite and operation ephemeris, count one
The sub-satellite track of MEO and LEO satellite in the ephemeris cycle, with " substar distance is most short " for principle, establish LEO and unique MEO
The corresponding relation of satellite, by LEO satellite zoning, there is manager of the MEO satellite as the region in each region, carries out
The convergence of one's respective area LEO satellite routing iinformation is with updating and adjacent area routing iinformation exchanges.MEO/LEO bilayer all optical networks
The problems such as inter-satellite link present in network is numerous, route assemblage task is heavy.Route can be reduced using district management strategy
Fresh information amount, improve routing convergence speed.
Multi-service Wavelength Assignment, by delineation of activities priority set, wavelength sub-clustering.Wavelength is taken for different brackets business
Sub-clustering distribution method, to reach the purpose for reducing high excellent level service blocking rate, improve wavelength utilization rate.
QoS difference is required in order to adapt to diversified business demand, and according to the current resource service condition of optical-fiber network
Offer targetedly services, and can be divided the different types of business of user according to one of following methods：
(1) divided according to business significance level：Relatively important business has higher priority, and in general business is matched somebody with somebody
It is set to relatively low priority；
(2) divided according to service feature index request (such as delay sensitive degree)：The business tool higher to delay requirement
There is higher priority, the business relatively low to delay requirement has relatively low priority；
(3) arrange to divide according to service quality：Such as according to the difference of user class, different service quality is provided respectively.
According to above service priority partition strategy, select a kind of strategy that delineation of activities priority, formation business is preferential
Level set F={ f1,f2,…,fm, typically take m=3 or m=4.
Wavelength sub-clustering, with service priority F={ f1,f2,…,fmIt is to correspond to wavelength sub-clustering C={ c1,c2,…,ck,
Ensureing that each priority corresponds to an i.e. m=k of wavelength cluster, wavelength available number is reduced successively using priority to be corresponding in wavelength cluster,
Each wavelength cluster medium wavelength can have common factor.
Link weight is initialized, defines the synthesis that satellite network link weight is link wavelength number and chain circuit transmission time delay
Function；
The K bar shortest paths of each (S, D) node pair are asked for according to link residue number of wavelengths and propagation delay time, are also key
Path.Choosing the principle of critical path is, each (S, D) node is by link wavelength number and propagation delay time to choosing link weight
Most short (minimum weights) path being calculated.Link weight is relevant with link residue number of wavelengths, is advantageous to keep network link
It is unimpeded, realize Network Load Balance.It is simultaneously also relevant with propagation delay time, advantageously ensure that the propagation delay time of real time data.
Each (S, D) node needs to consider all (S, D) nodes to the demand to link to the Actual path of request
Situation.The step of asking for the K bar critical paths of some S, D node pair is as follows：
1. the initial weight according to link residue wavelength and time delay setting each of the links is：
In formula (1) λ (u, v) be link (u, v) remaining number of wavelengths, λmaxFor current network link link residue wavelength
Several maximums, the weight of the maximum link of remaining number of wavelengths is 1 in network, and link residue number of wavelengths is smaller, respective weights
It is bigger.D (u, v) be link (u, v) propagation delay time, DminFor the minimal time delay of all links.α1Adjusted with β for link weight
The factor.
2. the link weight that applying equation (1) obtains, by dijkstra's algorithm, obtain one between (S, D) node pair
Shortest path is as critical path.Before next critical path is sought, weight maximum in current path is deleted from network
One link, so as to ensure that next critical path will not repeat with previous paths.
3. action 2. is repeated, until the number of path that reachable path or acquisition are not present between current (S, D) node pair is K
(general K takes 3-4).The actual critical path number between (S, the D) node pair is represented with K '.To all (S, D) nodes to performing 1.
To 3. process, the critical path collection of all nodes can be obtained.
The link weight of critical path is changed, when it is determined that, it is necessary to reset critical link in network after critical path
Weight, it is two parts, initial weight and Wavelength conflict degree by the weight definition of critical link.Initial weight is formula (1), and wavelength rushes
Bulging is then defined as：
Wherein
(s ', d ') is a certain (S, D) node pair in formula (2), and (s, d) is (S, D) node pair of current business flow request, P
It is the set of all (S, D) nodes pair, p=| P | it is the number of element in set P, SETi(s'd') it is (s ', d ') i-th
Critical path, εi(s'd') increment of path weight value is represented；μ is symbol logo, when the wavelength phase of (s ', d ') and (s, d) application
Meanwhile μ=1；When the wavelength difference of (s ', d ') and (s, d) application, μ=- 1.
The weight for resetting critical link is：
That is the initial weight of link and Wavelength conflict degree sum.
By the adjustment to critical link weight, the i.e. remaining wavelength of resource status of link, and each section have been considered
Point is to the conflict and competition on link.Above formula has reacted the combination of conflict avoidance and competition mechanism, for certain (S, D) node pair
While reserved wavelength span, should try one's best the link for avoiding other (S, D) nodes to applying for phase co-wavelength.When in certain link
When wavelength number is identical with the wavelength number of the application for other nodes pair that requesting node is external, the conflict degree increase μ ε of the linki(s'
D') (μ=1), it is meant that the weight of the link will also increase, and current request selection path, which should try one's best, avoids the link；And if
When certain link belongs to request (S, D) node to path itself, the conflict degree increase μ ε of the linki(s'd') (μ=- 1), meaning
The weight that taste the link will also reduce.Therefore, when selecting path for current request, prioritizing selection can be somebody's turn to do to a certain extent
Link.So, the introduction of competition strategy on the basis of conflict avoidance so that when selecting path for current request, on the one hand to the greatest extent
Amount avoids applying other nodes of phase co-wavelength number to the link on path, on the other hand, prioritizing selection current request section as far as possible
Link on the path of point pair, so as to ensure the efficient of algorithm performance.
The present invention can realize the reasonable utilization of Network Load Balance and resource, improve the utilization of satellite optical network medium wavelength
Rate, meets the communication requirement of different business, while substantially reduces the blocking rate of network, is research and the hair of satellite all-optical network
Exhibition provide advantageously with efficient Wavelength routing algorithm.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope of present disclosure, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (1)
1. a kind of method for routing, it is characterised in that specifically include：
S1：LEO satellite establishes link with unique MEO satellite, by LEO satellite zoning；
S2：According to type of service divided rank, service priority collection F={ f are determined1,f2,···,fm}；
S3：The number of wavelengths of satellite is counted, with service priority F={ f1,f2,···,fmWavelength sub-clustering, formation wavelength are divided
Gathering closes C={ c1,c2,···,ck, and make m=k；Highest priority traffic is set to possess the wavelength cluster of maximum, you can to use ripple
Long number is most；
S4：With wavelength available number and time delay initialization link weight C0(u, v), wherein u, v are satellite node；
S5：K bar critical paths are determined, link weight uses initial weight C0(u,v)；
S6：K bar critical paths link weight adjustment based on Wavelength conflict degree；
S7：Link weight and minimum path is selected to establish route from the K bar critical paths after adjustment weight, and it is excellent with business
First level is that foundation distributes wavelength in corresponding wavelength cluster；
S8：Network topology structure is updated, recalculates link weight.
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| CN111263417B (en) * | 2019-12-25 | 2021-07-09 | 北京邮电大学 | Service request processing method and device based on user type |
| CN114245421B (en) * | 2021-12-23 | 2022-06-24 | 军事科学院系统工程研究院网络信息研究所 | Satellite communication network flow balancing method based on tilt factor |
| CN115623366B (en) * | 2022-12-15 | 2023-03-10 | 鹏城实验室 | Route wavelength distribution method, device, terminal and medium of satellite all-optical network |
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| CN106817304A (en) | 2017-06-09 |
| CN107896189A (en) | 2018-04-10 |
| CN106817304B (en) | 2019-12-13 |
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Application publication date: 20180323 |