CN102694724A - Method for distributing routing wavelength of intelligent optical network supporting differentiated services - Google Patents
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- CN102694724A CN102694724A CN2012101526782A CN201210152678A CN102694724A CN 102694724 A CN102694724 A CN 102694724A CN 2012101526782 A CN2012101526782 A CN 2012101526782A CN 201210152678 A CN201210152678 A CN 201210152678A CN 102694724 A CN102694724 A CN 102694724A
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Abstract
The invention discloses a method for distributing wavelength of an intelligent optical network supporting differentiated services. The method comprises the following steps: giving different priorities to various services, and grouping the available wavelength according the priorities, wherein each priority corresponds to one wavelength group; searching free wavelength in the corresponding wavelength groups of the priorities according to the priorities of the services when the services come; if the free wavelength is in the wavelength groups, distributing the wavelength for the service, if the free wavelength is not in the wavelength groups, searching the free wavelength in the corresponding wavelength groups of the priorities according to the order of the priorities from high to low and distributing the wavelength for the service, and the free wavelength is still not in the wavelength groups, then refusing the service, wherein the wavelength groups are periodically and dynamically adjusted according to the pre-set period. The invention further discloses a method for distributing routing wavelength of the intelligent optical network supporting differentiated services. The method provided by the invention can guarantee the wavelength resources of the high-priority service and can improve the utilization rate of the network resource.
Description
Technical field
The present invention relates to a kind of optical-fiber network route wavelength (RWA:Routing and Wavelength Assignment) distribution method; Relate in particular to route Wavelength allocation method by the ASON (ION) of WDM/DWDM fundamental construction; According to professional priority level attribute assignment set of wavelengths; Reach the demand that reduces high-grade service blocking rate, belong to the optical communication technique field.
Background technology
Route and assignment of wavelength are one of key problems of optical-fiber network.In ASON (ION) by the WDM/DWDM fundamental construction, different nodes between service needed in optical-fiber network, seek suitable route and distribute suitable wavelengths.The RWA algorithm can be divided into static RWA (SRWA) and dynamic RWA (DRWA) according to the characteristic of business.SRWA need select route and distribute wavelength for the connection request of knowing in advance, and its core is that wavelength uses optimization problem; DRWA carries out real-time route for each service request that reaches to calculate and Wavelength Assignment, because total wavelength available number is limited, so the core of DRWA is to reduce the network blocking probability problem.
The solution of RWA problem can be divided into route subproblem and Wavelength Assignment subproblem.Route subproblem main algorithm has following several kinds:
(1) fixed route (FR:Fixed Routing), basic ideas are before Network reaches, to arbitrary node to confirming a fixing available route.When business reaches, be that any source node and destination node are to specifying unique path according to certain principle.If there are a plurality of satisfactory paths, one of picked at random therein then, then by the Different Optimization target for this reason the service selection on the route optimize wavelength, when no wavelength available, this business obstruction.If adopt fixed route, the RWA problem just can be reduced to assignment of wavelength, thereby simplifies the control and the management of network greatly.The advantage of this scheme be simple, speed is fast.Weak point is that the average blocking rate of network is higher, because when oneself quilt of the resource on this route was exhausted, all connection requests got clogged.Fixed routing algorithm confirms with shortest path first that generally shortest path first relatively more commonly used has dijkstra's algorithm and bellman-ford algorithm.
(2) fixing alternative route (FAR:Fixed-alternate Routing); Basic ideas be to arbitrary node to business confirm many subsequent use available routes; And by certain prioritized, come top be called main road by, other then be regarded as alternate routing.Wherein the number of alternative route can be confirmed as required.Fixing alternative routing algorithm is with respect to fixed routing algorithm, and its advantage is that the average blocking rate of network is reduced greatly, and makes network have stronger failover capability.Fixedly alternate routing algorithm commonly used is k shortest path (k-shortest path) routing algorithm.
(3) self adaptation route (AR:Adaptive Routing), the self adaptation route is a kind of scheme preferably, can carry out Route Selection dynamically according to current network state, preceding relatively two kinds of algorithms have lower network blocking probability.
Subproblem mainly comprises Wavelength Assignment:
(1) based on the Wavelength assignment algorithm of local message, only consider in the process of research etc. that the wavelength on the connection request route to be allocated uses information, the wavelength operating position in the whole network is not considered.Common algorithm has Random assignment (RA:Random Assignment) algorithm and initial hit (FF:First Fit) algorithm.
(2) based on the Wavelength assignment algorithm of global resource information, at first the operating position of all wavelengths resource in the whole network is carried out detail analysis in the research process, choose an optimal wavelength available again after learning analysis result.Common algorithm has maximum (MU:Most Used) algorithm and minimum (LU:Least Used) algorithm that uses of using.
(3) based on the Wavelength assignment algorithm of overall optical channel information; When distributing wavelength at the newly arrived connection request of research and for it; Need that original wavelength channel is set up situation and consider comprehensively, simultaneously according to a suitable wavelength available is selected in the influence of original wavelength channel.Common algorithm has minimum product (MP:Min Product) algorithm, minimum (LL:Least Load) algorithm, minimum summation (MS:Min Sum) algorithm, maximum summation (MS:Max Sum) algorithm, minimum influence (LI:Least Influence) algorithm, relative capacity loss (RCL:Relative Capacity Loss) algorithm and relative minimum influence (the RLI:Relative Least Influence) algorithm of carrying.
The major defect of RWA scheme is not consider professional different attribute (priority) in the existing optical-fiber network, and carries out Wavelength Assignment in view of the above.Because following network is the environment of a type of service and the alienation of demand difference in height; The differentiated demand that service connection request has requires optical-fiber network to take corresponding differentiation RWA mechanism: promptly not only need support the ability of dynamic RWA, also will realize the Wavelength Assignment strategy of differentiation simultaneously according to demand not of the same trade or business.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency of prior art; A kind of ASON Wavelength allocation method of supporting area separate service is provided; And a kind of ASON Wavelength allocation method of supporting area separate service; Can realize the Wavelength Assignment of differentiation according to the demand of different business, preferentially guarantee the wavelength resource of high-grade business, improve the resource utilization of network.
The present invention is concrete to adopt following technical scheme to solve the problems of the technologies described above.
A kind of ASON Wavelength allocation method of supporting area separate service is given different priority to all kinds of business, and wavelength available is divided into groups according to priority, and the corresponding wavelength of each priority divides into groups; When business arrives; According to this professional priority; At first from the wavelength corresponding with its priority divides into groups, searching for idle wavelength, as have idle wavelength, then is this traffic assignments wavelength; As do not have idle wavelength, then from the pairing wavelength of lower priority divides into groups, searching for idle wavelength successively according to priority order from high to low is this traffic assignments wavelength also; As still do not have idle wavelength, then refusal should business.
Further, said wavelength divides into groups to carry out dynamically adjustment of periodicity according to predetermined period, specifically according to following method: divide into groups to each wavelength all wavelengths mean allocation according to priority number when initial; When predetermined period arrives, wavelength available is divided into groups again according to each the priority service number that arrives in this cycle.
Preferably, during more than one of the idle wavelength that in each priority institute corresponding wavelength is divided into groups, searches, adopt initial hit algorithm or Random assignment algorithm from the idle wavelength that searches, to be this traffic assignments wavelength.
Preferably, the priority of said business is specifically divided according to following method:
Significance level according to business is divided, and important relatively business has higher priority, and general business has lower priority; Perhaps,
According to business the delay sensitive degree is divided, delay requirement is had higher priority than higher business, the lower business of delay requirement is had lower priority; Perhaps,
Divide according to QoS,, different service quality is provided respectively according to the difference of user's defrayment.
A kind of ASON route Wavelength allocation method of supporting area separate service may further comprise the steps:
Step 1, initialization network;
Step 2, the business that judged whether arrive, if do not have, continue to wait for; Otherwise go to step 3;
Step 3, be that professional the searching is fit to route;
Step 4, use more than the said Wavelength allocation method of arbitrary technical scheme be this traffic assignments wavelength;
Step 5, judge whether success of Wavelength Assignment,, go to step 7 if unsuccessful;
Step 6, set up light path, change step 8;
Step 7, whether satisfy the loop termination condition,, go to step 3 if do not satisfy; Otherwise go to step 8;
Step 8, release busy wavelength finish.
Compare prior art, the present invention has following beneficial effect:
One, the present invention introduces the Wavelength Assignment of ASON with priority, and the business of different priorities is adopted the different wavelengths allocation strategy, preferentially guarantees the wavelength resource of high-priority service, thereby has improved network resource utilization;
Two, the present invention divides into groups to carry out the periodicity dynamic assignment to the pairing wavelength of each priority according to the actual conditions of each priority service, and the wavelength resource of having avoided fixed wave length to divide into groups to cause is wasted, and has further improved network resource utilization.
Description of drawings
Fig. 1 is the ASON Wavelength allocation method principle schematic of supporting area separate service of the present invention;
Fig. 2 is the flow chart of the ASON Wavelength allocation method of supporting area separate service of the present invention;
Fig. 3 is the flow chart of the ASON route Wavelength allocation method of supporting area separate service.
Symbol description among the figure: G
1, G
2, G
3Be wavelength packet numbering, QoS
1, QoS
2, QoS
3The expression business-level, wherein service priority order from high to low is: QoS
1＞QoS
2＞QoS
3.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
The ASON Wavelength allocation method of supporting area separate service of the present invention, its thinking are the Wavelength Assignment of service priority being introduced ASON, give different priority to all kinds of business; And wavelength available divided into groups; The corresponding wavelength of each grade traffic assignments divides into groups, and at first from the pairing wavelength of its priority divides into groups, searches for idle wavelength during professional arrival, as does not have idle wavelength; Then then, the pairing wavelength of lower priority searches for idle wavelength from dividing into groups; Idle wavelength during the wavelength that the higher priority business can take lower priority divides into groups, otherwise, then cannot.Thereby guaranteed the wavelength resource of high-priority service.
In the technical scheme of the present invention, service priority can be divided according to actual needs, for example, can divide according to following several method:
Significance level according to business is divided, and important relatively business has higher priority, and general business has lower priority; Perhaps,
According to business the delay sensitive degree is divided, delay requirement is had higher priority than higher business, the lower business of delay requirement is had lower priority; Perhaps,
Divide according to QoS,, different service quality is provided respectively according to the difference of user's defrayment.
Because the quantity of all kinds of business possibly have bigger fluctuating in the different periods; For example; Occur a large amount of low priority traffices in certain time period, and high-priority service quantity is few, this moment as employing fixed wave length divide into groups; Then can cause more low priority traffice to be rejected, and the more wavelength resource in the grouping of high priority wavelength is wasted.For addressing this problem, the further wavelength packet cycle property of the present invention is dynamically adjusted strategy, divides into groups to each wavelength all wavelengths mean allocation according to priority number when promptly initial; When predetermined period arrives, according to each the priority service number that arrives in this cycle wavelength available to be divided into groups again, a fairly large number of business comprises more wavelength available number during its pairing wavelength divides into groups.
The principle of Wavelength Assignment of the present invention is as shown in Figure 1, and the number of fibers between network node does
n, the wavelength of every optical fiber multiplexing does
W, according to QoS business is divided into three rank: QoS from high to low in advance
1, QoS
2, QoS
3, the pairing wavelength of business at different levels divides into groups to name successively to be divided into G
1, G
2And G
3, comprise wavelength available respectively during three wavelength divide into groups
,
,
As shown in the figure, its Wavelength Assignment the strategy as follows:
Each wavelength grouping institute comprises number of wavelengths and under initial condition, equates (that is: a=b=c).After business arrives, at regular intervals
Upgrade each wavelength contained number of wavelengths of dividing into groups according to different business request situation, for example, at t
0QoS in time
1, QoS
2, QoS
3Service request quantity is respectively x, y, z (x, y, z are all greater than 1); Then better simply mode is to divide into groups again according to the ratio of each priority service number, i.e. renewal is respectively organized number of wavelengths (number of wavelengths rounds) and satisfied: the ratio of number of wavelengths is x:y:z in G1, G2, the G3 group.If this section period
Interior no a certain type or a few types of service request should guarantee when then upgrading number of wavelengths
, for example: at t
0In time, QoS
1, QoS
2, QoS
3Service request quantity is respectively x, y, 0, and (x, y are all greater than 1) is then upgraded each set of wavelengths number of wavelengths (number of wavelengths rounds) and satisfied: G
1, G
2The ratio of number of wavelengths is x:y in the group, G
3The group number of wavelengths is 1; Perhaps, at t
0In time, QoS
1, QoS
2, QoS
3Service request quantity is respectively x, 0,0, and (x is greater than 1) is then upgraded each set of wavelengths number of wavelengths and satisfied: G
2, G
3Number of wavelengths is 1, G in the group
1Be the residue wavelength available in the group.
QoS
1Business is at first selected G
1The group wavelength; Work as G
1When organizing no wavelength available, at G
2Search for wavelength available in the group; Work as G
2In the group during no wavelength available, at G
3Search for wavelength available in the group; Work as G
3During no wavelength available, refuse this QoS in the group
1Service request.
QoS
2Business is at first selected G
2The group wavelength; Work as G
2When group does not have wavelength available, at G
3Search wavelength available in the group; Work as G
3When group does not have wavelength available, refuse this QoS
2Service request.
QoS
3Professional at G
3The search wavelength available when not having wavelength available, is refused this QoS in the group
3Service request.
When each priority service finds
when bar can distribute wavelength, using initial hit or Random assignment algorithm is this traffic assignments wavelength.
The Wavelength Assignment flow process is as shown in Figure 2, may further comprise the steps:
Step 1: netinit, set each set of wavelengths primary wave long number
;
Step 2: service request arrives; Judgement time is
at interval; If set up; Upgrade the contained number of wavelengths of each set of wavelengths, repeating step 2 according to interior different business level request number of this time interval
; Otherwise go to step 3;
Step 3: judge whether this grade of service is QoS
1If change step 4; Otherwise, go to step 5;
Step 4: judge set of wavelengths G
1Whether there is wavelength idle,, jumps to step 8 if the free time is arranged; Otherwise jump to step 5;
Step 5: judge whether this grade of service is QoS
2, if go to step 6; Otherwise go to step 7;
Step 6: judge set of wavelengths G
2Whether there is wavelength idle,, jumps to step 8 if the free time is arranged; Otherwise jump to step 7;
Step 7: judge set of wavelengths G
3Whether there is wavelength idle,, goes to step 8 if the free time is arranged; Otherwise go to step 9;
Step 8:, then this Wavelength Assignment is given professional if assignable number of wavelengths is 1; If can distribute more than 1 of number of wavelengths, using initial hit algorithm or Random assignment algorithm is this traffic assignments wavelength.Go to step 10;
Step 9: refuse this service request;
Step 10: finish.
According to Wavelength allocation method of the present invention; And combine existing routing algorithm (for example dijkstra's algorithm, ant group algorithm etc.) can obtain the ASON route Wavelength allocation method of supporting area separate service of the present invention; Its flow process is as shown in Figure 3, may further comprise the steps:
Step 1, initialization network;
Step 2, the business that judged whether arrive, if do not have, continue to wait for; Otherwise go to step 3;
Step 3, be that professional the searching is fit to route Rsd;
Step 4, the above-mentioned Wavelength allocation method of use are this traffic assignments wavelength;
Step 5, judge whether success of Wavelength Assignment,, go to step 7 if unsuccessful;
Step 6, set up light path, change step 8;
Step 7, whether satisfy the loop termination condition,, go to step 3 if do not satisfy; Otherwise go to step 8;
Step 8, release busy wavelength finish.
Claims (6)
1. the ASON Wavelength allocation method of a supporting area separate service is characterized in that, gives different priority to all kinds of business, and wavelength available is divided into groups according to priority, and the corresponding wavelength of each priority divides into groups; When business arrives; According to this professional priority; At first from the wavelength corresponding with its priority divides into groups, searching for idle wavelength, as have idle wavelength, then is this traffic assignments wavelength; As do not have idle wavelength, then from the pairing wavelength of lower priority divides into groups, searching for idle wavelength successively according to priority order from high to low is this traffic assignments wavelength also; As still do not have idle wavelength, then refusal should business.
2. the ASON Wavelength allocation method of supporting area separate service according to claim 1; It is characterized in that; Said wavelength divides into groups to carry out dynamically adjustment of periodicity according to predetermined period, specifically according to following method: divide into groups to each wavelength all wavelengths mean allocation according to priority number when initial; When predetermined period arrives, wavelength available is divided into groups again according to each the priority service number that arrives in this cycle.
3. the ASON Wavelength allocation method of supporting area separate service according to claim 1; It is characterized in that; During more than one of the idle wavelength that in each priority institute corresponding wavelength is divided into groups, searches, adopt initial hit algorithm or Random assignment algorithm from the idle wavelength that searches, to be this traffic assignments wavelength.
4. the ASON Wavelength allocation method of supporting area separate service according to claim 1 is characterized in that, the priority of said business is specifically divided according to following method:
Significance level according to business is divided, and important relatively business has higher priority, and general business has lower priority; Perhaps,
According to business the delay sensitive degree is divided, delay requirement is had higher priority than higher business, the lower business of delay requirement is had lower priority; Perhaps,
Divide according to QoS,, different service quality is provided respectively according to the difference of user's defrayment.
5. the ASON route Wavelength allocation method of a supporting area separate service is characterized in that, may further comprise the steps:
Step 1, initialization network;
Step 2, the business that judged whether arrive, if do not have, continue to wait for; Otherwise go to step 3;
Step 3, be that professional the searching is fit to route;
Step 4, each said Wavelength allocation method of use claim 1-4 are this traffic assignments wavelength;
Step 5, judge whether success of Wavelength Assignment,, go to step 7 if unsuccessful;
Step 6, set up light path, change step 8;
Step 7, whether satisfy the loop termination condition,, go to step 3 if do not satisfy; Otherwise go to step 8;
Step 8, release busy wavelength finish.
6. like the ASON route Wavelength allocation method of the said supporting area separate service of claim 5, it is characterized in that adopting dijkstra's algorithm or ant group algorithm in the step 3 is that professional the searching is fit to route.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475440A (en) * | 2013-09-06 | 2013-12-25 | 南京邮电大学 | Impairment aware route and wavelength assignment method supporting differentiated services |
| CN104796217A (en) * | 2014-01-21 | 2015-07-22 | 中国联合网络通信集团有限公司 | Optical transport network wavelength assignment method and equipment |
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Application publication date: 20120926 |