CN108616783B - Spectrum sorting triggering method based on spectrum sensing in elastic optical network - Google Patents
Spectrum sorting triggering method based on spectrum sensing in elastic optical network Download PDFInfo
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Abstract
The invention discloses a frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network, which comprises the following steps: step (1): calculating the frequency spectrum availability and the service demand before arrangement; step (2): comparing the frequency spectrum availability before sorting with the service demand, and when the frequency spectrum availability before sorting is greater than or equal to the service demand, no frequency spectrum sorting is needed; when the frequency spectrum availability before sorting is less than the service requirement, calculating the sorted frequency spectrum availability, and executing the step (3); and (3): comparing the sorted frequency spectrum availability with the service demand, and triggering a frequency spectrum sorting mechanism when the sorted frequency spectrum availability is greater than or equal to the service demand; and when the availability of the frequency spectrum after the sorting is less than the service requirement, not performing the frequency spectrum sorting. The invention has the advantages of increasing the success rate of network service transmission, reducing the blocking rate of the service in the network and improving the utilization efficiency of network resources.
Description
Technical Field
The invention relates to the technical field of elastic optical networks and spectrum arrangement, in particular to a spectrum arrangement triggering method based on spectrum sensing in an elastic optical network.
Background
In recent years, high-bandwidth services represented by big data, cloud computing, deep learning, artificial intelligence and the like are rapidly developed, and higher requirements are put on transmission rates of communication systems and networks. The transmission capacity and efficiency of the optical fiber communication system are greatly improved through advanced modulation technology, multiplexing technology and the like. However, optical networks suffer from a number of deficiencies in handling the more diverse dynamic traffic demands: particularly, when a traditional Wavelength Division Multiplexing (WDM) system responds to a service connection request, a fixed spectrum division mechanism is adopted, and the defects of low resource utilization rate, poor flexibility and the like exist. Therefore, the demand for the next generation optical network having a flexible network architecture is very urgent. Elastic Optical Network (EON) is created accordingly, which has smaller spectrum granularity, can further divide Network spectrum resources into narrow spectrum units, i.e. Frequency Slots (FS), can flexibly allocate appropriate frequency slots according to bandwidth requirements of services, and is considered as one of the most potential next-generation Optical Network key technologies.
In elastic optical networks, spectrum allocation must meet the constraints of consistency and continuity. Considering the network environment with rapidly changing service requirements, the spectrum resources on the link are frequently allocated and released, and the spectrum is difficult to meet the conditions of consistency and continuity when the service allocation is subsequently reached. At this time, spectrum arrangement is required to release and optimize network spectrum resources, and since the spectrum arrangement may affect the current service, selecting an appropriate time to trigger a spectrum arrangement mechanism becomes a hot problem concerned by academia.
Some solutions have been proposed by academia for the problem of when to trigger spectrum grooming. Currently, the following two mechanisms are commonly used. One is a blocking triggering clearing mechanism (BTD), and the other is a periodic triggering clearing mechanism (BD) [ study of SBPP and spectral fragment re-clearing technology in wang super elastic optical network [ D. These two trigger mechanisms have respective advantages and disadvantages: the basic idea of BTD is that once the network detects the blockage, the frequency spectrum arrangement is triggered immediately, which has the advantages of relieving the network load in time when the network is blocked, providing the required frequency spectrum for the blocked service, reducing the service blockage rate and increasing the network throughput; but has the following disadvantages: the method can be used for sorting as long as network blockage occurs, and whether the network blockage can be effectively solved by reasonably evaluating the sorting is not judged, so that network resources can be wasted. The BD is thought to arrange the network according to a set period, and the method has the advantages that the excessively high fragmentation degree of the frequency spectrum resources can be effectively prevented once the network is fixedly arranged every time a period of time passes, but the method has the greatest defect that the frequency spectrum arrangement is also fixedly carried out when the network frequency spectrum condition is good, so that the waste of the network resources is caused. In summary, the existing spectrum defragmentation strategy lacks organic connection with the current service state and the arriving service, can not flexibly select proper operation according to the dynamic service request arrival and the current network resource occupation condition, and has the disadvantages of low success rate of network service transmission, high blocking rate of service in the network, low network resource utilization efficiency and the like.
Disclosure of Invention
The invention aims to provide a frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network, which can increase the success rate of network service transmission, reduce the blocking rate of services in the network and improve the utilization efficiency of network resources.
In order to achieve the purpose, the invention adopts the following technical scheme: the frequency spectrum arrangement triggering method based on frequency spectrum sensing in the elastic optical network comprises the following steps:
step (1): calculating the availability of the frequency spectrum before finishing according to the current situation of the frequency spectrum; calculating the service demand according to the frequency slot number required by the average arrival service;
step (2): comparing the frequency spectrum availability before finishing with the service demand, when the frequency spectrum availability before finishing is greater than or equal to the service demand, indicating that the existing frequency spectrum resources in the link can meet the service demand, and directly performing frequency spectrum allocation without frequency spectrum finishing; when the frequency spectrum availability before sorting is less than the service requirement, calculating the sorted frequency spectrum availability, and executing the step (3);
and (3): comparing the sorted frequency spectrum availability with the service demand, and triggering a frequency spectrum sorting mechanism to perform defragmentation on the frequency spectrum when the sorted frequency spectrum availability is greater than or equal to the service demand; when the availability of the sorted frequency spectrum is smaller than the service demand, the network load is very heavy, the available frequency spectrum cannot be allocated to the service even if the frequency spectrum sorting is carried out, and the frequency spectrum sorting is not carried out, and the service is blocked or discarded.
Further, in the foregoing method for triggering spectrum grooming based on spectrum sensing in an elastic optical network, the method includes: in the step (1), a specific calculation formula of the frequency spectrum availability before finishing is as follows:
wherein, abdIs the spectrum availability a before dressingbd，biIs the number of frequency slots of the ith free frequency slot block, n is the total number of free frequency slot blocks, and L is the total number of frequency slots of the link.
Further, in the foregoing method for triggering spectrum grooming based on spectrum sensing in an elastic optical network, the method includes: in step (1), the specific calculation formula of the service demand degree is as follows:
wherein r istIs the degree of the service requirement,
the number of frequency slots required for traffic averaging, L is the total number of frequency slots of the link.
Further, in the foregoing method for triggering spectrum grooming based on spectrum sensing in an elastic optical network, the method includes: in the step (2), a specific calculation formula of the sorted spectrum availability is as follows:
wherein, aadIs the spectrum availability after sorting, biIs the number of frequency slots of the ith free frequency slot block, n is the total number of free frequency slot blocks, and L is the total number of frequency slots of the link.
Through the implementation of the technical scheme, the invention has the beneficial effects that: the method can save the time of frequency spectrum allocation, reduce the blocking rate of the service in the network and improve the success rate of service transmission; meanwhile, the frequency spectrum arrangement is prevented from being triggered when the network load is light and the available frequency spectrum resources are more, and ineffective frequency spectrum arrangement is also not performed when the network resources are insufficient, so that the effective frequency spectrum arrangement is ensured, the interruption blocking rate of the existing service can be reduced, the network resources can be saved, and the effective throughput rate and the network resource utilization rate can be improved.
Drawings
Fig. 1 is a flowchart of a spectrum sorting triggering method based on spectrum sensing in an elastic optical network according to the present invention.
Fig. 2 is a schematic diagram of the spectrum before sorting.
Fig. 3 is a schematic diagram of the frequency spectrum after finishing.
Wherein the shaded boxes in fig. 2 and 3 represent used frequency slots, and the white boxes represent idle frequency slots.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, fig. 2, and fig. 3, considering that the ports of commercial optical network equipment in the existing network are mainly 100G and 40G, in combination with the forward error correction scheme, the redundancy overhead is increased by about 25% at most. Therefore, the minimum frequency slot unit in the elastic optical network can be set to 12.5GHz, and the number of frequency slots required by a single service request does not exceed 10 generally; by combining the background knowledge, the frequency slot number required by the average service demand is reached
The following three cases are discussed:
and
when in use
The method comprises the following steps: a frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network comprises the following steps:
step (1): according to the current spectrum situation, calculating the spectrum availability a before arrangementbd0.13; calculating the service demand according to the frequency slot number required by the average arrival service,rt＝0.043；
the specific calculation formula of the frequency spectrum availability before finishing is as follows:
wherein, abdIs the spectrum availability a before dressingbd，biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
the specific calculation formula of the service demand degree is as follows:
wherein r istIs the degree of the service requirement,
the number of frequency slots required for service averaging, where L is the total number of frequency slots of the link;
step (2): comparing the frequency spectrum availability before arrangement with the service demand, wherein abd＝0.13≥rtWhen the frequency spectrum resource in the link is 0.043, the existing frequency spectrum resource in the link can meet the requirement of the arriving service, and the frequency spectrum can be directly allocated without carrying out frequency spectrum sorting.
When in use
The method comprises the following steps: a frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network comprises the following steps:
step (1): according to the current spectrum situation, calculating the spectrum availability a before arrangementbd0.13; calculating the service demand degree r according to the frequency slot number required by the average arrival servicet＝0.217；
The specific calculation formula of the frequency spectrum availability before finishing is as follows:
wherein, abdIs the spectrum availability a before dressingbd，biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
the specific calculation formula of the service demand degree is as follows:
wherein r istIs the degree of the service requirement,
the number of frequency slots required for service averaging, where L is the total number of frequency slots of the link;
step (2): comparing the frequency spectrum availability before arrangement with the service demand, wherein abd＝0.13＜rtWhen the sum is 0.217, the spectrum availability after the sorting, a, is calculatedad0.39, and step (3) is executed,
the specific calculation formula of the sorted frequency spectrum availability is as follows:
wherein, aadIs the spectrum availability after sorting, biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
and (3): comparing the sorted frequency spectrum availability with the service demand, wherein aad＝0.39≥rtWhen the frequency spectrum is equal to 0.217, a frequency spectrum sorting mechanism is triggered to perform defragmentation on the frequency spectrum.
When in use
The method comprises the following steps: a frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network comprises the following stepsThe method comprises the following steps:
step (1): according to the current spectrum situation, calculating the spectrum availability a before arrangementbd0.13; calculating the service demand degree r according to the frequency slot number required by the average arrival servicet＝0.435；
The specific calculation formula of the frequency spectrum availability before finishing is as follows:
wherein, abdIs the spectrum availability a before dressingbd，biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
the specific calculation formula of the service demand degree is as follows:
wherein r istIs the degree of the service requirement,
the number of frequency slots required for service averaging, where L is the total number of frequency slots of the link;
step (2): comparing the frequency spectrum availability before arrangement with the service demand, wherein abd＝0.13＜rt0.435, the sorted spectrum availability, a, is calculatedad0.39, and performing step (3);
the specific calculation formula of the sorted frequency spectrum availability is as follows:
wherein, aadIs the spectrum availability after sorting, biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
and (3): will be provided withThe sorted frequency spectrum availability is compared with the service demand, and a at the momentad＝0.39＜rtWhen the network load is very heavy and the available spectrum cannot be allocated to the service even if spectrum consolidation is performed, the spectrum consolidation is not performed and the service is blocked or discarded.
Through the implementation of the technical scheme, the invention has the advantages that: the method can save the time of frequency spectrum allocation, reduce the blocking rate of the service in the network and improve the success rate of service transmission; meanwhile, the frequency spectrum arrangement is prevented from being triggered when the network load is light and the available frequency spectrum resources are more, and ineffective frequency spectrum arrangement is also not performed when the network resources are insufficient, so that the effective frequency spectrum arrangement is ensured, the interruption blocking rate of the existing service can be reduced, the network resources can be saved, and the effective throughput rate and the network resource utilization rate can be improved.
Claims (1)
1. A frequency spectrum arrangement triggering method based on frequency spectrum sensing in an elastic optical network is characterized in that: the method comprises the following steps:
step (1): calculating the availability of the frequency spectrum before finishing according to the current situation of the frequency spectrum; calculating the service demand according to the frequency slot number required by the average arrival service;
the specific calculation formula of the frequency spectrum availability before sorting is as follows:
wherein, abdIs the spectrum availability a before dressingbd，biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
the specific calculation formula of the service demand degree is as follows:
wherein r istIs a serviceThe degree of the demand is,
the number of frequency slots required for service averaging, where L is the total number of frequency slots of the link;
step (2): comparing the frequency spectrum availability before finishing with the service demand, when the frequency spectrum availability before finishing is greater than or equal to the service demand, indicating that the existing frequency spectrum resources in the link can meet the service demand, and directly performing frequency spectrum allocation without frequency spectrum finishing; when the frequency spectrum availability before sorting is less than the service requirement, calculating the sorted frequency spectrum availability, and executing the step (3);
the specific calculation formula of the sorted frequency spectrum availability is as follows:
wherein, aadIs the spectrum availability after sorting, biIs the frequency slot number of the ith free frequency slot block, n is the total number of the free frequency slot blocks, and L is the total frequency slot number of the link;
and (3): comparing the sorted frequency spectrum availability with the service demand, and triggering a frequency spectrum sorting mechanism to perform defragmentation on the frequency spectrum when the sorted frequency spectrum availability is greater than or equal to the service demand; when the availability of the sorted frequency spectrum is smaller than the service demand, the network load is very heavy, the available frequency spectrum cannot be allocated to the service even if the frequency spectrum sorting is carried out, and the frequency spectrum sorting is not carried out, and the service is blocked or discarded.
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