CN100471285C - A wave length buffer method capable of effectively reducing the blockage rate of the wave-length routing optical network - Google Patents
A wave length buffer method capable of effectively reducing the blockage rate of the wave-length routing optical network Download PDFInfo
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Abstract
A wavelength buffersize method for effectively reducing wavelength routing optical network blocking rate belongs to the technical field of reducing construction blocking rate in the optical communication network. The method comprises: the proposed wavelength buffersize method adopting some route and wavelength distributing method to calculate route and set up connection on the ''non buffersize wavelength'', when the network instantaneous service strength is low; however, when the network instantaneous service strength is strengthening suddenly if the network resource of the ''non buffersize wavelength'' can not meet the construction requirement, the method selectively setting up connection for new service on the buffersize wavelength based on the parameters such as service precedence and network state so as to effectively improve the resource utilization factor in virtue of the time unbalanced distribution of the network resource and further reduce the high, medium precedence service or block rate of the whole network.
Description
Technical field
The present invention describes a kind of road construction blocking rate that reduces in wavelength route optical network, improve the method for network resource utilization simultaneously, belongs to technical field of optical network communication.This method is specially adapted to the ASON of distributed wavelength route.
Background technology
Present existing optical-fiber network jamming control method mainly can be classified as two big classes.First kind method is set up network model by the distribution character of real network business is predicted, and according to this model appropriate design network topology and optimize the distribution of Internet resources, to reach the purpose that reduces network blocking probability.We claim that these class methods are the network modelling optimization method.Second class methods by certain strategy or technology, obtain minimum network blocking probability and the highest network resource utilization under the Limited resources condition after network topology and Internet resources are determined.We claim that these class methods are the network strategy optimization method.Wherein, first kind optimization method is based on static state.Because these class methods need to consider a large number of services factor and restrictive condition in modeling process, so its computation complexity is very high, is not suitable for adopting in the dynamic operation process after network builds up.The second class optimization method can be subdivided into three subclasses: route and Wavelength Assignment policy class (RWA), wavelength conversion class (WC), and heavy-route class.Wherein, the RWA policy class is optimized Route Selection by the design on the algorithm, thereby avoids congested generation as much as possible, makes full use of Internet resources; The WC class before the congested generation of optical-fiber network, is transferred to idle light wavelength with being about to that congested business takes place by introducing wavelength shifter, thereby reduces the negative effect that is brought by the restriction of wavelength continuity in the optical-fiber network, reduces network blocking probability; The heavy-route strategy is different with preceding two class strategies, and it is a kind of congested generation strategy afterwards that acts on, and soft seizing (SP) is its a kind of typical method.Be different from hard method for pre-emptively, after network congestion takes place, a new route is calculated in the existing Network that soft method for pre-emptively can be about to be seized, and this new route that and if only if is calculated and when should business changing the road success by new route, new business just can be seized operation.Therefore in essence, the heavy-route strategy is that adjusting again in real time of a kind of Internet resources is tactful, and makes resource distribution more reasonable by this adjustment, and resource utilization is higher.
Yet just present, all there is a common limitation in three subclasses of the second class optimization method: they all are to reach the more reasonable purpose of utilizing Internet resources by the space lack of uniformity that reduces network.The space lack of uniformity of network is caused by the factors such as space lack of uniformity that the lack of uniformity of network topology structure and Network distribute, available resources unbalanced distribution spatially when it has directly caused network implementation, this has limited them greatly and has been fully utilized.The unbalanced distribution in this space has constituted the basis of various strategies in the second class optimization method or technical role.
Yet, except the lack of uniformity of space, also existing the time lack of uniformity in the network, the instantaneous traffic intensity that shows as network is not a constant value, but fluctuates in a scope.This time lack of uniformity is mainly caused by the traffic performance of network.Fig. 1 has described the real time business intensity of circuit switching optical-fiber network and has blocked distribute (Poisson business model).We can see that the real time business intensity of network fluctuates up and down around its average (6.5 Erlang) from figure.For packet switching network, data service has stronger sudden and self-similarity, and therefore the time lack of uniformity exists equally in this network.The time lack of uniformity of visible network is ubiquitous.If can utilize this time lack of uniformity, will there be the space that further promotes in the resource utilization of network.
Summary of the invention
For utilizing the time lack of uniformity of network, the present invention proposes a kind of like this wavelength caching method of wavelength route optical network, it can improve network resource utilization and reduce the road construction blocking rate.
As can see from Figure 1, when offered load was light, the peak value period that appears at real time business intensity was concentrated in network congestion, and for other periods, seldom congested or even existence.Fig. 2 has explained the reason that this phenomenon produces.In Fig. 2, there are tangible correlation in the real time business intensity of network and its resource utilization, and the resource utilization that shows as network can the forward fluctuation along with the fluctuation of real time business intensity.In the peak value period of real time business intensity, the utilization of resources of network is near saturation condition, thereby caused the concentrated appearance of traffic congestion.And in other periods, the resource utilization of network is in a relatively low level, and this moment, Internet resources were not fully used.Therefore, if a caching resource district can be set in network, in the non-peak value period business in the buffer area " is emptied ", being about to idle Internet resources " concentrates " in this buffer area, and concentrate resource in " releases " buffer area to be used to solve congested in the peak value period, so just can reach the effect of reduction network blocking probability when improving resource utilization.The present invention just is based on this thought proposition.
The invention is characterized in:
1, this method is to realize successively according to the following steps on the control plane server of ASON:
Step (1): initialization: in described server, be preset with:
The agreement flow process of Open Shortest Path First OSPF and routing link slip condition database Router LSDB thereof;
RSVP is convenient to optical network node and can be obtained all professional routing iinformations in the network in real time, and the link circuit resource information that it takies is added up;
Step (2): preset a caching resource district in described server, and according to preset proportion the optical wavelength resources of respective numbers is reserved in this buffer area, remaining optical wavelength resources constitutes non-buffer area; And then described routing link slip condition database also is divided into buffer area LSD and non-buffer area LSD accordingly, these LSD are dynamically to be changed by the Link State of described server by described optical-fiber network;
Step (3): described server draws the Dijkstra shortest path to generate its routing table separately by algorithm to buffer area LSD described in the step (2) and non-buffer area LSD with the Otto Dix spy respectively, is called buffer area routing table and non-buffer area routing table;
Step (4): when a new Network arrives, in described non-buffer area routing table, for this service inquiry shortest path by:
Step (4.1): if shortest path is by existence, shows to block and take place, just in this non-buffer area to the normal road construction of new business;
Step (4.2): take place if shortest path by not existing, shows to have to block, handle (5) set by step;
Step (5): block according to the business described in the step (4),, take different processing operations to blocking business respectively according to the service priority grade of prior setting:
For low priority traffice, handle (6) set by step;
For high-priority service, handle (7) set by step;
Step (6): instantaneous network traffic intensity when blocking according to generation and buffer area link circuit resource utilance level are blocked the professional different processing operation of taking to the low priority in the step (5):
Instantaneous network traffic intensity I calculates by following formula:
I＝InsTrafNum/N，
Wherein, InsTrafNum represents the instantaneous professional number in the network, and N represents the number of network node;
Buffer area link circuit resource utilance U adds up and calculates by following formula:
Wherein, e
IjThe state of expression buffer area link i when the j time sampling: 1 for taking, and 0 is idle, | E| represents the number of links in network-caching district, and k is illustrated in the sampling number when carrying out link circuit resource occupancy statistics;
When the instantaneous traffic intensity I of network greater than its setting threshold I
Th, and buffer area link circuit resource utilance U is less than its setting threshold U
ThThe time, handle (7) set by step;
Instantaneous traffic intensity I is less than or equal to its setting threshold I when network
Th, perhaps buffer area link circuit resource utilance U is more than or equal to its setting threshold U
ThThe time, described server returns this professional blockage information, and finishes its road construction request;
Step (7): open the caching resource district, and be the high priority obstruction business in the step (5), or the middle instantaneous traffic intensity of network of step (6) is greater than its setting threshold I
Th, and buffer area link circuit resource utilance is less than its setting threshold U
ThLow priority block the service inquiry shortest path by:
If shortest path by existence, then is the new business road construction in buffer area;
If shortest path is not by existing, then described server returns this professional blockage information, and finishes its road construction request.
2, step (4.2) afterwards and step (5) before, can be the professional route of seeking of described obstruction with route and Wavelength allocation method earlier, if route does not exist, then block and take place, attempt solving this obstruction with soft method for pre-emptively more afterwards, seize business object if find at non-buffer area, then the business that this quilt is seized changes the road, with the professional resource of going to take the business of being seized of described obstruction,, block solution again in non-buffer area road construction; If soft method for pre-emptively failure, then execution in step (5).
3, for described default caching resource district, for the wavelength route network, its granularity is the optical wavelength magnitude.
4, for non-wavelength route network, the minimum exchange granularity that the granularity in its caching resource district is supported for this non-wavelength route network.
5, setting the all-network business is high-priority service, under the business load intensity of setting, with the increase of starting from scratch of buffer area capacity, each recruitment is its minimum particle size value, when minimum appears in the network blocking probability that is write down, stop, promptly obtaining the optimum buffer area capability value under this business load intensity this moment.
6, start from scratch and constantly increase business load intensity according to the step-length of setting, business load intensity for each setting, repeat the operation described in 5, when appearring in network blocking probability, minimum writes down its pairing optimum buffer area capability value, this minimum exceeds 20% o'clock of blocking rate higher limit that network sets and stops when regular traffic load section operation, promptly obtained between the regular traffic load region this moment in optimum buffer area capability value with the curve of business load Strength Changes.
The concrete workflow of the wavelength caching method of wavelength route optical network of the present invention as shown in Figure 3.
Simulation result (Fig. 4) shows that after adopting the wavelength caching method, the blocking rate index of network has obtained very big improvement.We see from figure, and between the regular traffic load region of network (network blocking probability is less than 20%, and panel load is less than 12Erlang), the wavelength caching method is compared typical existing network strategy optimization method all can significantly further reduce network blocking probability.Especially for light-loaded network (panel load is less than 6Erlang), network blocking probability significantly reduces especially, special in wavelength caching method and soft method for pre-emptively (SP) when being used in combination, network blocking probability can drop to common LLR method 1/20 or merely the SP method 1/6.
Description of drawings
Fig. 1: traffic intensity and obstruction distribution map during network implementation.
Fig. 2: traffic intensity and its real-time resource utilization graph of a relation during network implementation.
Fig. 3: wavelength caching method workflow diagram.
Fig. 4: network blocking probability characteristic comparison diagram..
Fig. 1 explanation: this is the real time business intensity and the obstruction distribution map of a circuit switching optical-fiber network, and the top of figure is the instantaneous network traffic intensity, and the below is the professional number of the obstruction of per second statistics.Wherein, network topology adopts the EON topological model of 19 nodes, and the Poisson model is adopted in Network.The artificial service number is 5000, and blocking professional number is 122, and the artificial service intensity of load is 6.5Erlang, service rate μ=0.1 second
-1
Fig. 2 explanation: this is the graph of a relation of real time business intensity He its real-time resource utilization of a circuit switching optical-fiber network, and the top of figure is the instantaneous network traffic intensity, and the below is its resource utilization.Identical among all-network simulation parameter among this figure and Fig. 1.Legend is as follows:
Fig. 3 explanation: this is the routing module workflow diagram that adopts the network node of wavelength caching method.
Fig. 4 explanation: this is the network blocking probability comparison diagram that adopts the wavelength caching method and adopt existing representative network policy optimization method.Wherein, Network arrives and follows the Poisson process, and mean allocation is on each node.The business service time follows negative exponent and distributes, and average service time is 1 second.Legend is as follows:
Embodiment
For achieving the above object,, comprise the parts such as setting, unlatching and route calculating in caching resource district below by the embodiment of concrete network example explanation wavelength caching method proposed by the invention.In this network example, adopt soft enforcement of seizing the auxiliary wavelength caching method of network strategy optimization method (SP) to reach best network optimization effect:
1. the caching resource district is provided with:
(1) the resource granularity of buffer area and resource reservation setting thereof
For minimum exchange granularity is the wavelength route optical network of wavelength, and the resource granularity in caching resource district should be set to the wavelength rank.It should be noted that all optical fiber links need be reserved identical wavelength resource to the caching resource district in this network, make each wavelength resource in the buffer area all can independently constitute a sub-network that has complete topology.
For the network of other minimum exchange granularities less than wavelength, the resource granularity in caching resource district should be set to the minimum exchange granularity of this network.Equally, the resource reservation in this resources in network buffer area should abide by the principle, i.e. this reservation need make the resource of each resource granularity in the buffer area can both independently constitute a sub-network that has complete topology.
(2) the amount of capacity setting of buffer area
The amount of capacity in caching resource district will directly have influence on the optimization effect of wavelength caching method to network.If buffer area is provided with excessive, can reduce the blocking rate of high-priority service significantly.But because it has taken too much Internet resources, can worsen the blocking rate index of low priority traffice, thereby cause the overall performance of network to can not get improving.Buffer area was provided with the optimization effect of young pathbreaker's wavelength-limited caching method to network.Therefore, when considering overall network performance, the buffer area capability value of an optimum of objective reality, this optimal value can change along with the variation of node traffic intensity of load.In actual mechanical process, can obtain the concrete numerical value that optimum buffer area capability value changes with intensity of load by following steps:
Steps A: setting the all-network business is high-priority service.
Step B: for the business load intensity of setting, the buffer area capacity is increased gradually from zero, each recruitment is its minimum particle size.
Step C: when the buffer area capacity whenever is increased to a numerical value, observe the variation of overall network blocking rate,, write down its numerical value up to its fluctuation range 1% o'clock less than its value.Continue to increase the buffer area capacity afterwards, and the operation of repeating step C, equal whole network capacity, or the blocking rate that is write down stops when minimum occurring up to the buffer area capacity.
Step D: find out the minimum of the network blocking probability that is write down, its pairing buffer area capability value is the optimum buffer area capability value under this business load intensity.
Step e: increase business load by a fixed step size, the operation of repeating step B-D, the upper limit of this index when the network blocking probability index surpasses network at regular traffic load section operation, under normal conditions, this upper limit can be made as 20%; So far, we have just obtained the variation tendency of optimum buffer area capability value with intensity of load.
16 wavelength EON networks the optimum buffer area capability value under different loads intensity of table 1 for obtaining by above method.In this network example, we are provided with the size of buffer area capacity according to the Data Dynamic in this table.
The optimum buffer area capacity setting of table 1 (19 node EON networks, 16 wavelength)
2. the unlatching in caching resource district and route are calculated:
In this network example, we adopt the EON network topology model of 19 nodes, and the light wave long number is set at 16.Wherein, Network arrives and follows the Poisson process, and mean allocation is on each node.The business service time follows negative exponent and distributes, and average service time is 1 second, and the average of node traffic intensity is 6.5 Erlang.Simultaneously, we also set the instantaneous network traffic intensity threshold value I that opens the caching resource district
ThAverage (I for node traffic intensity
Th=6.5 Erlang), buffer area link circuit resource utilance threshold value U
Th=50%.
To three business of A, B, C that a certain moment arrives, we take different buffer areas to open and routing operations according to the workflow (Fig. 3) of described wavelength caching method.Wherein, professional B is a high-priority service, and professional A, C are low priority traffice.This instantaneous network traffic intensity I=6Erlang constantly, buffer area link circuit resource utilance U=45%.
Professional A: non-buffer area with shortest path by with the Wavelength Assignment strategy be that professional A seeks route, this route does not exist, and blocks generation.Enable soft method for pre-emptively afterwards and attempt solving this obstruction, find and seize business object, and should business successfully change the road at non-buffer area.Then professional A takies this quilt and seizes professional resource, and success is blocked solution in non-buffer area road construction.In this process, do not open the caching resource district.
Professional B: non-buffer area with shortest path by with the Wavelength Assignment strategy be that professional B seeks route, this route does not exist, and blocks generation.Enable soft method for pre-emptively afterwards and attempt solving this obstruction at non-buffer area, can not find and seize object, obstruction still can't solve.Next step prepares to open the caching resource district, and attempting is that professional B seeks route in buffer area.Because professional B is a high-priority service, according to the workflow (Fig. 3) of wavelength caching method, the skip thresholds deterministic process is directly opened buffer area.Then buffer area with shortest path by with the Wavelength Assignment strategy be that professional B seeks route, this route exists.In buffer area, professional B is carried out the road construction operation afterwards, block solution.
Professional C: non-buffer area with shortest path by with the Wavelength Assignment strategy be that professional C seeks route, this route does not exist, and blocks generation.Enable soft method for pre-emptively afterwards and attempt solving this obstruction at non-buffer area, can not find and seize object, obstruction still can't solve.Next step prepares to open the caching resource district, and attempting is that professional C seeks route in buffer area.Because professional C is a low priority traffice,, need before opening buffer area, open threshold decision according to the workflow (Fig. 3) of wavelength caching method.Though buffer area link circuit resource utilance U＜U of this moment
Th, meet the unlocking condition of buffer area, but instantaneous network traffic intensity I＜I
Th, can't satisfy the another one unlocking condition of buffer area.By workflow, abandon opening the caching resource district, and the output blockage information.
The method that in wavelength route optical network, reduces the road construction blocking rate of the present invention, be not limited only to listed utilization in specification and the execution mode, it can be used to various suitable the present invention's field fully, and those skilled in the art can easily realize additional advantages of the present invention and it is made amendment.Therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details and illustrates here and describe.
Claims (6)
1, a kind of wavelength caching method that can reduce the wavelength route optical network blocking rate is characterized in that, this method is to realize successively according to the following steps on the server of the network control plane of ASON:
Step (1): initialization: in described server, be preset with:
The agreement flow process of Open Shortest Path First OSPF and routing link slip condition database Router LSDB thereof;
RSVP is convenient to optical network node and can be obtained all professional routing iinformations in the network in real time, and the link circuit resource information that it takies is added up;
Step (2): preset a caching resource district in described server, and according to preset proportion the optical wavelength resources of respective numbers is reserved in this buffer area, remaining optical wavelength resources constitutes non-buffer area; And then described routing link slip condition database also is divided into buffer area LSD and non-buffer area LSD accordingly, these LSD are dynamically to be changed by the Link State of described server by described optical-fiber network;
Step (3): described server draws the Dijkstra shortest path to generate its routing table separately by algorithm to buffer area LSD described in the step (2) and non-buffer area LSD with the Otto Dix spy respectively, is called buffer area routing table and non-buffer area routing table;
Step (4): when a new Network arrives, in described non-buffer area routing table, for this service inquiry shortest path by:
Step (4.1): if shortest path is by existence, shows to block and take place, just in this non-buffer area to the normal road construction of new business;
Step (4.2): take place if shortest path by not existing, shows to have to block, handle (5) set by step;
Step (5): block according to the business described in the step (4),, take different processing operations to blocking business respectively according to the service priority grade of prior setting:
For low priority traffice, handle (6) set by step;
For high-priority service, handle (7) set by step;
Step (6): instantaneous network traffic intensity when blocking according to generation and buffer area link circuit resource utilance level are blocked the professional different processing operation of taking to the low priority in the step (5):
Instantaneous network traffic intensity I calculates by following formula:
I＝InsTrafNum/N，
Wherein, InsTrafNum represents the instantaneous professional number in the network, and N represents the number of network node;
Buffer area link circuit resource utilance U adds up and calculates by following formula:
Wherein, e
IjShow the not state of buffer area link i when the j time sampling: 1 for taking, and 0 is idle, | E| represents the number of links in network-caching district, and k is illustrated in the sampling number when carrying out link circuit resource occupancy statistics;
When the instantaneous traffic intensity I of network greater than its setting threshold I
Th, and buffer area link circuit resource utilance U is less than its setting threshold U
ThThe time, handle (7) set by step;
Instantaneous traffic intensity I is less than or equal to its setting threshold I when network
Th, perhaps buffer area link circuit resource utilance U is more than or equal to its setting threshold U
ThThe time, described server returns this professional blockage information, and finishes its road construction request;
Step (7): open the caching resource district, and be the high priority obstruction business in the step (5), or the middle instantaneous traffic intensity of network of step (6) is greater than its setting threshold I
Th, and buffer area link circuit resource utilance is less than its setting threshold U
ThLow priority block the service inquiry shortest path by:
If shortest path by existence, then is the new business road construction in buffer area;
If shortest path is not by existing, then described server returns this professional blockage information, and finishes its road construction request.
2, a kind of wavelength caching method that can reduce the wavelength route optical network blocking rate according to claim 1, it is characterized in that, step (4.2) afterwards and step (5) before, can be the professional route of seeking of described obstruction with route and Wavelength allocation method earlier, if route does not exist, then block and take place, attempt solving this obstruction with soft method for pre-emptively more afterwards at non-buffer area, seize business object if find, then the business that this quilt is seized changes the road, with the professional resource of going to take the business of being seized of described obstruction,, block solution again in non-buffer area road construction; If soft method for pre-emptively failure, then execution in step (5).
3, a kind of wavelength caching method that can reduce the wavelength route optical network blocking rate according to claim 1 is characterized in that, for described default caching resource district, for the wavelength route network, its granularity is the optical wavelength magnitude.
4, a kind of wavelength caching method that can reduce the wavelength route optical network blocking rate according to claim 1 is characterized in that, for non-wavelength route network, and the minimum exchange granularity that the granularity in its caching resource district is supported for this non-wavelength route network.
5, a kind of wavelength caching method that can reduce the wavelength route optical network blocking rate according to claim 1, it is characterized in that, setting the all-network business is high-priority service, under the business load intensity of setting, with the increase of starting from scratch of buffer area capacity, each recruitment is its minimum particle size value, stops when minimum appears in the network blocking probability that is write down, and promptly obtains the optimum buffer area capability value under this business load intensity this moment.
6, according to claim 1,5 described a kind of wavelength caching methods that can reduce the wavelength route optical network blocking rate, it is characterized in that, starting from scratch constantly increases business load intensity according to the step-length of setting, business load intensity for each setting, repeat the described operation of claim 5, when appearring in network blocking probability, minimum writes down its pairing optimum buffer area capability value, this minimum exceeds 20% o'clock of blocking rate higher limit that network sets and stops when regular traffic load section operation, promptly obtained between the regular traffic load region this moment in optimum buffer area capability value with the curve of business load Strength Changes.
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| CN101170711B (en) * | 2007-11-19 | 2010-06-23 | 中兴通讯股份有限公司 | Information transmission device and method for automatically switching optical network SCN and MCN |
| CN101360347B (en) * | 2008-09-12 | 2010-12-15 | 清华大学 | Route selection method for wavelength routing optical network |
| CN102665148A (en) * | 2012-04-20 | 2012-09-12 | 北京联合大学 | Wavelength allocation method and wavelength allocation device for improving network load balance |
| CN104796217B (en) * | 2014-01-21 | 2019-03-15 | 中国联合网络通信集团有限公司 | A kind of Wavelength allocation method and equipment of optical transport network |
| CN104869660A (en) * | 2014-02-21 | 2015-08-26 | 中兴通讯股份有限公司 | Method, controller and gateway capable of ensuring continuity of business data |
| CN105471762B (en) * | 2015-11-16 | 2018-05-25 | 国家电网公司 | A kind of Time Perception service degradation method of power communication net topology |
| CN108076158B (en) * | 2018-01-08 | 2020-07-03 | 苏州大学 | Minimum load route selection method and system based on naive Bayes classifier |
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