CN114979842A - Elastic partition frequency spectrum allocation method of space division multiplexing elastic optical network - Google Patents

Elastic partition frequency spectrum allocation method of space division multiplexing elastic optical network Download PDF

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CN114979842A
CN114979842A CN202210532380.8A CN202210532380A CN114979842A CN 114979842 A CN114979842 A CN 114979842A CN 202210532380 A CN202210532380 A CN 202210532380A CN 114979842 A CN114979842 A CN 114979842A
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elastic
partition
spectrum
frequency spectrum
cores
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彭樱
张盛峰
张晓斌
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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Abstract

The invention relates to an elastic partition frequency spectrum allocation (EZSA) method of a space division multiplexing elastic optical network, belonging to the field of optical communication. With the increasing shortage of frequency spectrum resources, the problem of fully utilizing resources in a network and reducing frequency spectrum fragments becomes the key point of research, the invention considers the frequency spectrum compactness during frequency spectrum distribution and the crosstalk among cores among multiple fiber cores, improves the methods of fixed frequency spectrum partition and elastic partition under the scene of multiple fiber cores, and compared with the traditional partition method, the EZSA firstly divides fiber cores into groups to reduce the crosstalk among multiple fiber cores, then determining modulation formats to divide the service requests into four categories and distributing the service requests in corresponding partitions, and considering the spectrum compactness in the process of spectrum distribution, and finally when the resources of the current partition are insufficient, in the elastic partitioning process, an elastic partitioning mechanism based on service segmentation is adopted, so that while the generation of excessive frequency spectrum fragments is avoided, the flexibility of frequency spectrum allocation can be guaranteed, frequency spectrum resources in a network are fully utilized, and normal transmission of services is guaranteed under the condition of limited resources.

Description

Elastic partition frequency spectrum allocation method of space division multiplexing elastic optical network
Technical Field
The invention relates to the field of optical communication, in particular to the problem of elastic partition in a space division multiplexing elastic optical network.
Background
With the increasing popularity of various network services, the overall traffic of the internet is growing rapidly, resulting in an exponential increase of communication bandwidth per year, these huge data streams need to be transmitted in the optical fiber of the backbone network, so that the communication network faces huge bandwidth capacity requirements, the conventional wavelength division multiplexing optical communication system relies on a single-mode optical fiber, wherein optical signals are transmitted in parallel through non-overlapping, fixed-time-interval channels in the frequency domain, and ITU fixed frequency grid limits bandwidth partitioning and granularity of allocation, resulting in mismatching of allocation and request link bandwidths. In addition, in a Wavelength Division Multiplexing (WDM) network, a modulation format cannot be adaptively selected, and scalability is difficult to achieve, so that it is difficult to adapt to the development requirements of a future optical network. An Orthogonal Frequency Division Multiplexing (OFDM) -based Elastic Optical Network (EON) has become an excellent solution to the problem of efficient spectrum allocation under the condition of exponential increase of Network traffic nowadays, but due to the nonlinear shannon limit of a traditional Single-Mode fiber (SMF), the transmission capacity of the SMF is approaching to the upper limit thereof, so that the recently proposed space division multiplexing Elastic Optical Network based on multiple fiber cores can further solve the problem of transmission capacity, but due to the introduction of multiple fiber cores, the problem of crosstalk between fiber cores is also introduced, so that the problem of spectrum fragmentation among multiple fiber cores is increased, and if the solution for solving the problems is lacked, the Network transmission performance is directly influenced.
The reason for generating the crosstalk between the cores is mainly because the adjacent fiber cores use the same frequency spectrum slot, and two methods for solving the problem of the crosstalk between the cores exist at present, one is crosstalk avoidance, and the other is crosstalk perception, wherein the crosstalk avoidance comprises predefined fiber core priority, predefined priority areas and fiber core groups, and the crosstalk perception is realized by setting a crosstalk threshold value to physically control the crosstalk in a network. The present invention takes into account the complexity of crosstalk sensing and therefore selects simple core groupings in crosstalk avoidance to avoid crosstalk. For the problem of spectral fragmentation among multiple cores, the document [1] "On-Demand Spectrum and Core Allocation for Reducing Crosstalk in Multicore Fibers in Elastic Optical Networks [ J ]. Journal of Optical Communications and Networking,2014,6(12):1059-1071 ] proposes a Core classification strategy that reduces the generation of spectral fragmentation by assigning a uniform bandwidth connection to each Core. But fixing the allocated bandwidth in each core reduces the flexibility of spectrum allocation. Subsequently, a document [2] "Load-balanced adaptive polarizing band splitting and core assignment in SDM-EONs based on mixed super-channel [ J ]. Optical Fiber Technology, 2019,51:6-16 ] proposes a single-Fiber-core-based elastic partitioning method, which improves the flexibility of spectrum allocation to a certain extent, but is based on partitions on a single Fiber core, and has the disadvantages of excessive partitions and too small partition area, and on the contrary, the blocking rate of the service is increased. Most of the existing methods adopt a fixed partition and a single fiber core classification method, and the problems of frequency spectrum compactness and frequency spectrum fragments generated after elastic partition are adopted are not considered during frequency spectrum allocation, the elasticity of the frequency spectrum allocation mode is too low, the frequency spectrum allocation mode is not suitable for the situation that complicated and various service types exist in a network, and the partition mode which is too fixed and has too small partition area can increase the blocking rate of the service.
Therefore, in consideration of the disadvantages of the existing partitioning method, the invention provides an elastic partitioning spectrum allocation method for a space division multiplexing elastic optical network, which reduces spectrum fragments in the network by an elastic partitioning mechanism while considering crosstalk between cores, and improves the success rate of service transmission.
Disclosure of Invention
In view of this, the present invention provides a method for allocating spectrum in resilient partition in a space division multiplexing resilient optical network, which provides a method for allocating spectrum in resilient partition on the basis of considering multi-fiber core crosstalk, and aims to improve flexibility in spectrum allocation and reduce spectrum fragmentation in the network, thereby improving success rate of service transmission.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for allocating elastic subarea frequency spectrums of a space division multiplexing elastic optical network comprises the following specific steps:
s1: initializing a network topology and initializing the spectrum resource state of each link;
s2: grouping non-adjacent fiber cores, and marking the grouping type as G 1 、G 2 And G 3 ；
S3: for the incoming service
Figure RE-GDA0003703456700000021
Calculating K (K is {1,2,3}) shortest paths, and selecting an optimal transmission route;
s4: calculating the frequency slot number FS required by the service request according to the current service type i And recording;
s5: calculating available white space blocks in a current transmission path taking into account a crosstalk threshold
Figure RE-GDA0003703456700000022
And recording;
s6: dividing the fiber cores in the group into sections, and marking the section type as
Figure RE-GDA0003703456700000023
And
Figure RE-GDA0003703456700000024
according to FS i Matching available partitions;
s7: calculating available idle spectrum blocks in a transmission path
Figure RE-GDA0003703456700000025
Is/are as follows
Figure RE-GDA0003703456700000026
Value, select the best free spectrum block
Figure RE-GDA0003703456700000027
And recording;
s8: optimal transmission path and optimal white space block through recording
Figure RE-GDA0003703456700000028
Distributing corresponding spectrum resources and returning relevant paths and resource information;
further, in step S2, the grouping type specifically includes:
G 1 : considering the problem of crosstalk among cores of multiple fibers, the invention adopts a mode of grouping fiber cores to avoid crosstalk, and non-adjacent fiber cores 1,2 and 3 are divided into a group G 1 1,2,3, when G 1 After the resources in (1) are allocated, consider G 2 、G 3 ；
G 2 : non-adjacent cores 4,5 and 6 are grouped into a group, G 2 ＝{4,5,6}；
G 3 : dividing the common core into a group, G 3 {7}, where the common core is not partitioned, when G 1 、G 2 When there are no available resources, then G is used 3 Spectrum resources in (2);
further, in step S3, the process of selecting the optimal transmission route specifically includes:
s31: calculating the value of each link in the network topology according to the resource usage on the link
Figure RE-GDA0003703456700000031
A numerical value;
Figure RE-GDA0003703456700000032
is defined as follows:
Figure RE-GDA0003703456700000033
where C is the set of multicore fiber cores, F represents the number of frequency slots on the link,
Figure RE-GDA0003703456700000034
is a binary variable, when the slot f on the fiber core c of the link l is not occupied, the value is 1, when the slot f is occupied, the value is 0,
Figure RE-GDA0003703456700000035
the larger the average number of unused frequency slots on the link.
S32: to be provided with
Figure RE-GDA0003703456700000036
Calculating K shortest paths for the service request by using a YEN-KSP algorithm for the weight of each link;
s33: finally, performing ascending sequencing on the K shortest paths according to the transmission distance of each shortest path;
further, in step S6, the partition type specifically includes:
Figure RE-GDA0003703456700000037
the subareas are elastic subareas, the subarea ranges are a fiber core 1 and a fiber core 4, and frequency gap numbers are preferentially distributed
Figure RE-GDA0003703456700000038
And
Figure RE-GDA0003703456700000039
when the partition has no available resources, the partition may be extended to
Figure RE-GDA00037034567000000310
And
Figure RE-GDA00037034567000000311
i.e. cutting service requests into standard spectrum blocks to be allocated to
Figure RE-GDA00037034567000000312
And
Figure RE-GDA00037034567000000313
(
Figure RE-GDA00037034567000000314
the standard block of the spectrum is 5,
Figure RE-GDA00037034567000000315
standard spectral block 3), the remaining frequency slots are allocated to the common core. When in use
Figure RE-GDA00037034567000000316
And
Figure RE-GDA00037034567000000317
when no available resource exists, the service request is distributed to the public fiber core;
Figure RE-GDA00037034567000000318
the subareas are elastic subareas, the subarea ranges are a fiber core 2 and a fiber core 5, and frequency gap numbers are preferentially distributed
Figure RE-GDA00037034567000000319
When the partition has no available resources, the partition may be extended to
Figure RE-GDA00037034567000000320
When in use
Figure RE-GDA00037034567000000321
When no available resource exists, the service request is distributed to the public fiber core;
Figure RE-GDA00037034567000000322
the subareas are elastic subareas, the subarea ranges are the fiber cores 3 and 6, and frequency gap numbers are preferentially distributed
Figure RE-GDA00037034567000000323
When the partition has no available resources, the partition may be extended to
Figure RE-GDA00037034567000000324
When in use
Figure RE-GDA00037034567000000325
When no available resource exists, the service request is distributed to the public fiber core;
wherein
Figure RE-GDA00037034567000000326
And
Figure RE-GDA00037034567000000327
the service requests are four major classes of service requests, and the service requests respectively represent the service requests with frequency slot numbers of 3, 5 and 2 times and prime numbers; the invention sets standard frequency spectrum blocks in the elastic partitioning process,
Figure RE-GDA00037034567000000328
the standard spectrum block in (1) is 5,
Figure RE-GDA00037034567000000329
the standard spectrum block in (2) is 3. For example, when
Figure RE-GDA00037034567000000330
When the service request with the frequency slot number of 14 cannot be accommodated, the flexible partition is considered, and
Figure RE-GDA00037034567000000331
the frequency gap number of 10-2 x 5 can be accommodated in the core, and the rest 4-14-10 is distributed to the common core; in the same way, in
Figure RE-GDA00037034567000000332
Can accommodate 12-4 x 3 frequency slots, and the remaining 2-14-12 are assigned to the common core.
The invention is therefore to
Figure RE-GDA0003703456700000041
And
Figure RE-GDA0003703456700000042
is arranged in a subarea, and the frequency slot number required by the service request can be always determined by considering that the addition or subtraction of the prime number and the prime number is definitely even number
Figure RE-GDA0003703456700000043
And
Figure RE-GDA0003703456700000044
the formula is expressed as formula (2):
Figure RE-GDA0003703456700000045
where N is {0,1, 2., N }, and M is {0,1, 2., M }, for example, when FS is used i When the service request of 11 is released, the current idle spectrum block
Figure RE-GDA0003703456700000046
Can allocate FS i The allocation forms are various and fragments are not easily generated for service requests of 11, 7, 4, etc.
Further, in step S7, the method specifically includes:
s71: if the current path does not have an exact free spectrum block
Figure RE-GDA0003703456700000047
The degree of closeness in the spectral allocation is taken into account.
S72: according to the current available idle frequency spectrum block
Figure RE-GDA0003703456700000048
Value, selection
Figure RE-GDA0003703456700000049
The largest value of the white space blocks. Wherein the content of the first and second substances,
Figure RE-GDA00037034567000000410
is as defined in formula (3):
Figure RE-GDA00037034567000000411
Figure RE-GDA00037034567000000412
indicating the spectral compactness of the mth satisfactory free spectral block on path P and core C,
Figure RE-GDA00037034567000000413
representing the m-1 st white space block,
Figure RE-GDA00037034567000000414
represents the m +1 th white space block,
Figure RE-GDA00037034567000000415
indicating the end index of the (m + 1) th white space block,
Figure RE-GDA00037034567000000416
indicating the starting index of the (m-1) th white space block.
The invention has the beneficial effects that:
the invention provides an elastic subarea frequency spectrum allocation method of a space division multiplexing elastic optical network, which divides nonadjacent fiber cores in a seven-core optical fiber into a group, preferentially allocates one group of the fiber cores in consideration of the problem of crosstalk among the cores, then defines each fiber core in the group as a subarea, the frequency gap number allocated in each subarea meets a certain multiple relation, and finally defines each subarea as an elastic subarea in consideration of the condition of uneven distribution of service requests. The invention has the following advantages: 1. the area range of each partition is increased, and the condition that the service blocking rate is increased due to too small partition area is avoided; 2. the number of the frequency slots meeting the multiple relation is distributed in each partition, so that the number of the distributable service types in the partitions can be increased while the frequency spectrum fragments are reduced; 3. the problem of spectrum fragmentation after elastic partitioning is considered by partitioning the traffic into standard spectrum blocks, reducing the spectrum fragmentation in the network.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a block diagram of a federated system of the present invention;
FIG. 2 is a diagram of a seven-core optical fiber for use in the present invention;
FIG. 3 is a flow chart of elastic spectrum allocation proposed by the present invention;
detailed description of the preferred embodiments
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a method for allocating elastic subarea frequency spectrums of a space division multiplexing elastic optical network, which is mainly used for solving the problem that a large number of frequency spectrum fragments appear in the network.
In the sdm elastic optical network, the traditional spectrum partitioning process generally adopts a fixed partitioning mode or has fewer elastic regions, the partitioning mode is not flexible enough, and service blocking can be caused by too fixed partitioning, so the invention provides an elastic partitioning mechanism, and referring to fig. 1, firstly, the invention provides elastic partitioning in the spectrum allocation process, the frequency slot number in each partition meets a certain multiple relation, and then, the invention considers the spectrum compactness in the spectrum allocation process, thereby further improving the spectrum utilization rate.
Referring to FIG. 2, in G 1 For example, G 2 And G 1 In the same way, the application scene of the invention is the seven-core optical fiber in the space division multiplexing elastic optical network, firstly, non-adjacent fiber cores 1,2 and 3 are divided into a group G 1 The cores 4,5,6 are grouped into a group G, 1,2,3 2 The core 7 is divided into a group G of 4,5,6 3 7. FIG. 1 shows the formula G 1 For example, each core is divided into a segment,
Figure RE-GDA0003703456700000051
middle distribution
Figure RE-GDA0003703456700000052
And
Figure RE-GDA0003703456700000053
middle distribution
Figure RE-GDA0003703456700000054
Middle distribution
Figure RE-GDA0003703456700000055
Referring to fig. 3, the proposed flexible partition spectrum allocation algorithm (EZSA) is specifically:
inputting: optical network topology G (V, E), service request r i (s i ,d i ,B i ,T s ,T e ) And is waiting forThe number of service requests I (I ═ {1,2,3, …,10000 }).
And (3) outputting: requested transmission path P k Service number i, service blocking rate BP, spectrum utilization SUR.
S1: initializing a network topology and initializing the spectrum resource state of each link;
s2: a preprocessing stage, grouping non-adjacent fiber cores, and marking the grouping type as G 1 、G 2 And G 3 ，G 1 ＝{1,2,3}、 G 2 4,5,6 and G 3 ＝{7}；
S3: after the service arrives, the service number I is made to be 1(I belongs to I), and K shortest candidate paths between the source node and the destination node are calculated by a KSP algorithm;
s4: judging whether I belongs to I, if I belongs to I, transferring the step to S5; if it is used
Figure RE-GDA0003703456700000057
Step (S11);
s5: for the incoming service
Figure RE-GDA0003703456700000056
Calculating K (K is {1,2,3}) shortest paths, and selecting an optimal transmission route;
s6: performing ascending arrangement according to the total transmission distance, selecting the shortest path according to the sequence, and setting a variable K as 1(K belongs to K);
s7: calculating the frequency slot number FS required by the service request according to the current service type i And recording;
s8: calculating available white space blocks in a current transmission path taking into account a crosstalk threshold
Figure RE-GDA0003703456700000061
And record if
Figure RE-GDA0003703456700000062
If not, the step is transferred to S9, otherwise, the step is transferred to S7 by making k + 1;
s9: according to the frequency slot number FS corresponding to the request type i Selecting the best by EZSA algorithmIf the allocation is successful, i is equal to i +1, the step is switched to S4, otherwise, k +1 is switched to S7;
s10: judging whether K belongs to K, if K belongs to K, transferring to S8, otherwise, turning to the step of K
Figure RE-GDA00037034567000000623
The service request i is blocked;
S11：
Figure RE-GDA00037034567000000624
the algorithm ends.
The EZSA algorithm flow referred to in fig. 3 refers to the right half of fig. 3, and the specific process is as follows:
s91: traverse G N N ═ {1,2,3}, where N is 1(N ∈ N);
s92: judging whether N belongs to N, if N belongs to N, transferring to S93; if it is not
Figure RE-GDA0003703456700000063
The algorithm ends and returns.
S93: according to the frequency slot number FS corresponding to the request type i Match the corresponding partition, if
Figure RE-GDA0003703456700000064
Is matched to
Figure RE-GDA0003703456700000065
If it is
Figure RE-GDA0003703456700000066
Is matched to
Figure RE-GDA0003703456700000067
If it is
Figure RE-GDA0003703456700000068
Is matched to
Figure RE-GDA0003703456700000069
S95: if the current partition is
Figure RE-GDA00037034567000000610
Then the current partition is transferred to
Figure RE-GDA00037034567000000611
And using 5 as standard frequency spectrum block to convert FS i Performing division to obtain the residual FS i Allocating to common fiber core, if available idle frequency spectrum block in current partition
Figure RE-GDA00037034567000000612
If the algorithm is still empty, the step is switched to S96, otherwise, the algorithm is ended and the process returns; if the current partition is
Figure RE-GDA00037034567000000613
Then the current partition is transferred to
Figure RE-GDA00037034567000000614
And using 3 as standard spectrum block to convert FS i Performing division to obtain the residual FS i Distributing to the common fiber core, and turning to S97; if the current partition is
Figure RE-GDA00037034567000000615
Then the current partition is transferred to
Figure RE-GDA00037034567000000616
And using 5 as standard spectrum block to convert FS i Performing division to obtain the residual FS i Distributing to the common fiber core, and turning to S97;
s96: transferring a current partition to
Figure RE-GDA00037034567000000617
And using 3 as standard frequency spectrum block to convert FS i Performing division to obtain the residual FS i Distributed into a common core;
s97: judging current partition and common core
Figure RE-GDA00037034567000000618
Whether it is empty or not, if soIf n is equal to n +1, the step proceeds to S92.
S94: further judging accurate idle frequency spectrum block
Figure RE-GDA00037034567000000619
If the idle spectrum blocks are empty, the algorithm is ended, and if the idle spectrum blocks are empty, the algorithm returns to the step of counting the idle spectrum blocks meeting the requirements
Figure RE-GDA00037034567000000620
Value, ascending selection
Figure RE-GDA00037034567000000621
Minimum value idle spectrum block
Figure RE-GDA00037034567000000622
And finishing the algorithm and returning.
In summary, the invention improves the process of resilient spectrum partitioning in the prior art in the application scenario of multiple fiber cores, reduces the problem of spectrum fragmentation in the network, ensures the flexibility of spectrum allocation, and can adapt to complex and various service request types.

Claims (5)

1. A method for allocating elastic subarea frequency spectrums of a space division multiplexing elastic optical network is characterized by comprising the following steps:
s1: initializing a network topology and initializing the spectrum resource state of each link;
s2: grouping non-adjacent fiber cores, and marking the grouping type as G 1 、G 2 And G 3 ；
S3: for the incoming service
Figure RE-FDA0003703456690000011
Calculating K (K is {1,2,3}) shortest paths, and selecting an optimal transmission route;
s4: calculating the frequency slot number FS required by the service request according to the current service type i And recording;
s5: calculating under consideration of crosstalk thresholdAvailable white space blocks in a pre-transmission path
Figure RE-FDA0003703456690000012
And recording;
s6: dividing the fiber cores in the group into sections, and marking the section type as
Figure RE-FDA0003703456690000013
And
Figure RE-FDA0003703456690000014
according to FS i Matching available partitions;
s7: calculating available idle spectrum blocks in a transmission path
Figure RE-FDA0003703456690000015
Is/are as follows
Figure RE-FDA0003703456690000016
Value, select the best free spectrum block
Figure RE-FDA0003703456690000017
And recording;
s8: optimal transmission path and optimal white space block through recording
Figure RE-FDA0003703456690000018
And allocating corresponding spectrum resources and returning relevant path and resource information.
2. The method according to claim 1, wherein in step S2, the packet type specifically includes:
G 1 : considering the problem of crosstalk between cores of multiple fibers, non-adjacent cores 1,2 and 3 are grouped into a group when G is 1 After the resources in (1) are allocated, consider G 2 、G 3 ；
G 2 : not adjacent to each otherThe fiber cores 4,5 and 6 are grouped into one group;
G 3 : the common cores 7 are grouped into a group.
3. The method according to claim 1, wherein in step S3, the process of selecting the optimal transmission route specifically includes:
s31: calculating the value of each link in the network topology according to the resource usage on the link
Figure RE-FDA0003703456690000019
A numerical value;
s32: with w load Calculating K shortest paths for the service request by using a YEN-KSP algorithm for the weight of each link;
s33: and finally, sequencing the K shortest paths in an ascending order according to the transmission distance of each shortest path.
4. The method according to claim 1, wherein in step S6, the partition type specifically includes:
Figure RE-FDA00037034566900000110
the subareas are elastic subareas, the subarea ranges are a fiber core 1 and a fiber core 4, and frequency gap numbers are preferentially distributed
Figure RE-FDA00037034566900000111
And
Figure RE-FDA00037034566900000112
when the partition has no available resources, the partition may be extended to
Figure RE-FDA00037034566900000113
And
Figure RE-FDA00037034566900000114
i.e. cutting service requests into standard spectrum blocks to be allocated to
Figure RE-FDA0003703456690000021
And
Figure RE-FDA0003703456690000022
the standard block of the spectrum is 5,
Figure RE-FDA0003703456690000023
standard spectral block 3), the remaining frequency slots are allocated to the common core. When in use
Figure RE-FDA0003703456690000024
And
Figure RE-FDA0003703456690000025
when no available resource exists, the service request is distributed to the public fiber core;
Figure RE-FDA0003703456690000026
the subareas are elastic subareas, the subarea ranges are a fiber core 2 and a fiber core 5, and frequency gap numbers are preferentially distributed
Figure RE-FDA0003703456690000027
When the partition has no available resources, the partition may be extended to
Figure RE-FDA0003703456690000028
When in use
Figure RE-FDA0003703456690000029
When no available resource exists, the service request is distributed to the public fiber core;
Figure RE-FDA00037034566900000210
the subareas are elastic subareas, the subarea ranges are the fiber cores 3 and 6, and frequency gap numbers are preferentially distributed
Figure RE-FDA00037034566900000211
When the partition has no available resources, the partition may be extended to
Figure RE-FDA00037034566900000212
When in use
Figure RE-FDA00037034566900000213
When no available resource exists, the service request is distributed to the public fiber core;
wherein
Figure RE-FDA00037034566900000214
And
Figure RE-FDA00037034566900000215
the service requests with the frequency slot numbers of 3, 5, and multiples of 2 and prime numbers are respectively represented by four major classes of the service requests.
5. The method according to claim 1, wherein the step S7 specifically includes:
s71: if the current path does not have an exact free spectrum block
Figure RE-FDA00037034566900000216
The closeness of the spectrum allocation is taken into account;
s72: according to the current available idle frequency spectrum block
Figure RE-FDA00037034566900000217
Value, to calculated
Figure RE-FDA00037034566900000218
Sorting the values in ascending order, selecting in sequenceSelecting appropriate white space blocks
Figure RE-FDA00037034566900000219
And recorded.
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CN115580362A (en) * 2022-10-14 2023-01-06 西南交通大学 Electromagnetic target dynamic frequency-using strategy determination method based on frequency spectrum monitoring data
CN115580362B (en) * 2022-10-14 2024-05-17 西南交通大学 Electromagnetic target dynamic frequency strategy determination method based on frequency spectrum monitoring data

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