CN110035337B - Active multi-stream spectrum allocation method based on exponential division frequency block in elastic optical network - Google Patents
Active multi-stream spectrum allocation method based on exponential division frequency block in elastic optical network Download PDFInfo
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- CN110035337B CN110035337B CN201910302976.7A CN201910302976A CN110035337B CN 110035337 B CN110035337 B CN 110035337B CN 201910302976 A CN201910302976 A CN 201910302976A CN 110035337 B CN110035337 B CN 110035337B
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Abstract
The invention provides an active multi-stream spectrum allocation method based on an exponential division frequency block in an elastic optical network, which comprises the following steps: dividing frequency spectrum resources in a network into frequency block segments with the exponentially increased number of frequency slices; when a connection request comes, calculating the number of frequency slices required by the connection request; if the number of frequency slices is just equal to the size of a certain frequency block, the frequency slices are taken as a stream; otherwise, splitting the connection request into a plurality of streams, so that the sum of the number of the service frequency slices required by each stream and 1 is equal to the size of a certain frequency block; searching an idle frequency block with the largest weighted occupation quantity index in a corresponding type frequency block section on a path; if all the streams in the connection request find the idle frequency blocks, establishing connection for each stream of the connection request by using the found idle frequency blocks; otherwise the connection request is rejected. The invention can achieve the triple effects of simplifying the node structure, reducing the complexity of resource allocation and reducing the blocking rate of the connection request; spectrum resources can be utilized more efficiently.
Description
Technical Field
The invention relates to the technical field of elastic optical networks, in particular to an active multi-stream spectrum allocation method based on an exponential division frequency block in an elastic optical network.
Background
With the rapid development of technologies such as cloud computing, big data, artificial intelligence, mobile internet and the like, the requirement of an application scene on network bandwidth is higher and higher, and the difference of bandwidth requirements of different applications is larger and larger, so that a traditional optical network based on a Wavelength Division Multiplexing (WDM) technology can only provide a Wavelength channel with a fixed frequency spectrum, and cannot meet the difference of the bandwidth requirements of the applications. An Elastic Optical Network (EON) technology is based on an Optical Orthogonal Frequency Division Multiplexing (O-OFDM) technology, and spectrum resources can be flexibly allocated according to the bandwidth requirement of application, so that the difference requirement of the application on the bandwidth can be met.
In the elastic optical network, the spectrum resources are generally divided into Frequency Slices (FS), and the Frequency bandwidth occupied by each FS is much smaller than the Frequency bandwidth occupied by the wavelength in the WDM technology. When allocating spectrum resources for a connection request in an elastic optical network, three limiting conditions need to be satisfied: 1) the frequency spectrum is not limited by overlapping, namely, the frequency chip resources used by different connection requests cannot be overlapped with each other; 2) spectrum continuity constraints, i.e. the frequency slices allocated for a connection request must be the same on all links of a lightpath; 3) spectrum adjacency limitation, in each link, the frequency slice resources required to be allocated for the same connection must be adjacent to each other. These three constraints make the spectrum allocation problem in the elastic optical network very complicated, and easily cause fragmentation of idle resources, and there may be a case where the connection request is blocked because the idle resources do not satisfy the above three constraints.
In order to fully utilize spectrum fragmentation, researchers have proposed a multi-stream based spectrum allocation method. In the method, firstly, idle spectrum resources are searched for a connection request, if a large enough idle spectrum resource block cannot be found, the connection request is split into a plurality of streams according to the idle condition of the current resources, and small idle spectrum blocks are respectively used for establishing connection for the plurality of streams. In the method, multi-stream division of a connection request is passively performed according to a network resource state, and different network resource states can result in different multi-stream division results for the same connection request. The passive multi-stream division method can effectively utilize the current frequency spectrum fragments and increase the success probability of frequency spectrum allocation; however, this method cannot plan the use of network spectrum resources for a long time, and cannot effectively utilize the spectrum resources.
Disclosure of Invention
Aiming at the technical problem that a passive multi-stream spectrum allocation method in the existing elastic optical network cannot effectively utilize spectrum resources, the invention provides an active multi-stream spectrum allocation method based on an index division frequency block in the elastic optical network, which can more effectively utilize the spectrum resources and greatly reduce the blocking rate of a connection request.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: an active multi-stream spectrum allocation method based on an exponential division frequency block in an elastic optical network comprises the following steps:
the method comprises the following steps: dividing frequency spectrum resources in a network into C types of frequency block segments, wherein the number of frequency slices contained in the different types of frequency block segments is exponentially increased by taking 2 as a base, namely the size of the C type of frequency block is 2cC is more than or equal to 1 and less than or equal to C;
step two: when a path P from a source node s to a destination node dsdWhen the connection request comes, acquiring the number of service frequency slices required by the connection request as S, and calculating the number of frequency slices required by the connection request as S + 1;
step three: if S +1 is just equal to the size of the c frequency blocks, the connection request in the step two is taken as a stream; if S +1 is not equal to the size of any type of frequency block, actively splitting the connection request into a plurality of streams, so that the sum of 1 and the number of service frequency slices required by each stream is equal to the size of c frequency blocks;
step four: for each flow split in step three, at path PsdSearching an idle frequency block in the upper corresponding type frequency block section; if a plurality of idle frequency blocks exist, selecting the idle frequency block which enables the weighted occupancy index to be maximum;
step five: if all the streams in the connection request find the idle frequency blocks, the connection request is accepted by the network, and the found idle frequency blocks are used for establishing connection for each stream of the connection request; if the stream of the idle frequency block is not found in the connection request, the connection request is rejected.
As a preferred technical solution, the intermediate frequency block type C in the step one is determined according to the connection request with the largest spectrum requirement in all connection requests, and the number of service frequency slices required by the connection request with the largest bandwidth requirement is recorded as SmaxThen the spectrum needs to be divided into C frequency blocks, where C satisfies 2C≤Smax+1＜2C+1。
As a preferred technical solution, in the third step, when allocating spectrum resources for each stream requested by the connection, the connection request is used in units of frequency blocks, that is, each stream uses exactly one frequency block.
As a preferred technical solution, the method for splitting the flow in the third step comprises: if connection is requestedThe required number of the service frequency slices is S, if c exists1So that
The number of service frequency slices needed by the first flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
If it is not
The splitting process is finished, otherwise, the split stream is continuously split; if c is present2So that
The number of service frequency slices needed by the second flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
Repeating the steps until the number of the service frequency slices needed by the rest part is 0, ending the splitting process, wherein c1、c2Is one of any c kinds of frequency blocks.
As a preferred technical scheme, the weighted occupancy index of each idle frequency block in the fourth step is a · BN+b·BRWherein B isNRepresentation and path PsdThe number of occupied corresponding frequency blocks on the adjacent link, BRRepresentation and path PsdThe number of occupied corresponding frequency blocks on non-adjacent links, a and B are used for adjusting the number B respectivelyNAnd the number BRTwo common parameters.
The invention has the beneficial effects that: firstly, dividing spectrum resources into a plurality of types of spectrum blocks, wherein the sizes of the spectrum blocks of different types are increased exponentially, and the distribution of the spectrum blocks on different links has consistency; when a connection request comes, actively splitting the connection request into a plurality of streams according to the size of a frequency block, so that each stream can be transmitted in a certain type of frequency spectrum block; each stream just uses one spectrum block, so that when spectrum resources are allocated for the connection request, spectrum adjacency limitation does not need to be considered, spectrum continuity consideration is simpler, the spectrum resources can be more effectively utilized, and the influence of the spectrum adjacency limitation and the spectrum continuity limitation can be reduced in the resource allocation process, so that the blocking rate of the connection request can be greatly reduced. The invention can achieve the triple beneficial effects of simplifying the node structure, reducing the complexity of resource allocation and reducing the blocking rate of the connection request.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a diagram illustrating an example of an exponential frequency division block method for spectrum resources in a network according to the present invention.
Fig. 3 is an exemplary diagram of an active multi-stream splitting method for connection request.
Fig. 4 is a diagram illustrating an example of a method for calculating the weighted usage of a frequency block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, an active multi-stream spectrum allocation method based on an exponential division frequency block in an elastic optical network reduces spectrum adjacency limitation and spectrum continuity limitation during spectrum allocation by dividing a spectrum into multiple types of frequency blocks and splitting a connection request into multiple streams, increases reusability of the spectrum, and finally achieves an effect of reducing a connection request blocking rate.
The method comprises the following steps: dividing frequency spectrum resources in a network into C types of frequency block segments, wherein the number of frequency slices contained in the different types of frequency block segments is exponentially increased by taking 2 as a base, namely the size of the C type of frequency block is 2cC is more than or equal to 1 and less than or equal to C.
The frequency spectrum resources in the network are divided into a plurality of types of frequency block segments, and the number of frequency slices contained in the frequency block segments of different types is increased by taking 2 as a base index. FIG. 2 shows an example of a method for partitioning frequency blocks into link spectrum resources in a network, in which the spectrum on each link in the network is partitioned into three frequency block segments including a first frequency block segment, a second frequency block segment and a third frequency block segment, and each frequency block in the first frequency block segment comprises 21A frequency slice, and the frequency block is recorded as FB1(ii) a Each block in the second frequency block segment comprises 22A frequency slice, and the frequency block is recorded as FB2(ii) a Each frequency block in the third frequency block segment comprises 23A frequency slice, and the frequency block is recorded as FB3. When allocating spectrum resources for each stream of a connection request, it can only be used in units of frequency blocks, and cannot use frequency slices across frequency blocks, i.e. each stream uses exactly one frequency block.
The number of the frequency blocks in each type of frequency block segment is not fixed, but can be adjusted according to the situation of connection request in the network. The number C of the divided frequency block types is determined according to the connection request with the maximum spectrum requirement in all the connection requests, and the bandwidth requirement is recorded to be maximumThe number of service frequency slices required by the connection request is SmaxThen the spectrum needs to be divided into C frequency blocks, where C satisfies 2C≤Smax+1＜2C+1。
Step two: when a path P from a source node s to a destination node dsdWhen the connection request comes, the number of the service frequency slices required by the connection request is obtained as S, and the number of the frequency slices required by the connection request is calculated as S + 1.
When a connection request on a certain path arrives, since at least 1 protection frequency chip is needed between different connection requests, S +1 frequency chips actually need to be allocated to the connection request.
Step three: if S +1 is exactly equal to the size of a certain type of chunk, then treat the connection request as a stream; if S +1 is not equal to the size of any type of frequency block, the connection request is actively split into a plurality of streams, so that the number of service frequency slices required by each stream plus 1 is just equal to the size of some type of frequency block.
If the connection request requires a spectrum that is exactly equal to a chunk of a certain type c, the connection request is treated as a stream, otherwise the connection request is actively split into multiple streams, i.e., the connection request is split into multiple sub-requests at the source node, and the spectrum required by each stream is equal to a chunk of a certain type. A connection request is a flow that is split at the source node into multiple sub-flows, each of which is treated as a connection request to allocate resources. As shown in fig. 3, which is a diagram of an example of a multi-stream splitting method for connection request, if the number of service frequency slices required by the connection request is S, if c exists1So that
The number of service frequency slices needed by the first flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
If it is not
The splitting process is finished, otherwise, the split stream is continuously split; if c is present2So that
The number of service frequency slices needed by the second flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
And repeating the steps until the number of the service frequency slices needed by the rest part is 0, and finishing the splitting process. For example, in FIG. 3, when a connection request requires 5 traffic tiles, since 22≤5+1＜23Therefore, the number of service frequency slices needed by the first stream is 3, and the corresponding frequency block is FB2The number of the service frequency slices needed by the rest part after the first splitting is 5- (2)2-1) ═ 2; due to 21≤2+1＜22Therefore, the corresponding video block of the second stream is FB1The number of the service frequency slices needed by the rest part after the second splitting is 5- (2)2-1)-(21-1) 1; due to 21≤1+1＜22Therefore, the corresponding video block of the third stream is FB1The number of the service frequency slices needed by the rest part is 5- (2)2-1)-(21-1)-(21-1) 0, the splitting process ends. Finally, the connection request requiring 5 service frequency slices is split into three streams of 3, 1 and 1, corresponding to three frequency blocks FB respectively2、FB1、FB1。
Step four: for each flow split in step three, at path PsdSearching an idle frequency block in the upper corresponding type frequency block section; if there are multiple idle frequency blocks, selecting the weighted occupancy index a.BN+b·BRThe largest free block.
Looking at path P in allocating spectrum to each streamsdAnd calculating the weighted occupation amount of all idle frequency blocks corresponding to the frequency blocks, and finally selecting the idle frequency block with the largest weighted occupation amount index for the stream. And selects the idle frequency block with the minimum weighted occupation amount. When allocating spectrum resources for each stream of the connection request, only the corresponding frequency block segment is checked. For example, a stream requiring 3 traffic tiles need only look at 22Frequency block segment, while a stream requiring 1 service frequency slice only needs to be checked for 21A frequency block segment. A block is free on a path if it is free on all links of the path. Firstly, all idle frequency blocks in a frequency block section corresponding to one stream are found, and then the weighted occupancy index a.B of each idle frequency block is calculatedN+b·BR。BNRepresentation and path PsdThe number of occupied corresponding frequency blocks on the adjacent link, BRRepresentation and path PsdThe number of occupied corresponding frequency blocks on non-adjacent links, a and B are two common parameters for adjusting BNAnd BRThe influence of (c).
Fig. 4 is a diagram illustrating a relationship between links and paths in a network. In FIG. 4, the path of the connection request is P58The links in the network can be divided into three sets, the bold part in fig. 4 is path P58Link of (c), the set of which is denoted as EP(ii) a The dotted part is the sum path P58Adjacent links, the set of which is denoted as EN(ii) a The remaining links not specially marked are AND paths P58Non-adjacent links, the set of which is denoted ER. For a block if it is in set EPIs idle, it is on path P58The upper part is idle; suppose the idle block is in set ENIs occupied on 2 links, i.e. BNIn set E ═ 2RIs occupied on 3 links, i.e. B R3; if the parameters a is 2 and b is 1, the idle frequency is determinedWeighted occupancy of blocks as a · BN+b·BR＝2×2+1×3＝7。
Step five: if all the streams find the idle frequency blocks, the connection request is accepted by the network, and the found idle frequency blocks are used for establishing connection for each stream of the connection request; if there is a stream for which no free block is found, the connection request is denied.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. An active multi-stream spectrum allocation method based on an exponential division frequency block in an elastic optical network is characterized by comprising the following steps:
the method comprises the following steps: dividing frequency spectrum resources in a network into C types of frequency block segments, wherein the number of frequency slices contained in the different types of frequency block segments is exponentially increased by taking 2 as a base, namely the size of the C type of frequency block is 2cC is more than or equal to 1 and less than or equal to C;
step two: when a path P from a source node s to a destination node dsdWhen the connection request comes, acquiring the number of service frequency slices required by the connection request as S, and calculating the number of frequency slices required by the connection request as S + 1;
step three: if S +1 is just equal to the size of the c frequency blocks, the connection request is taken as a stream; if S +1 is not equal to the size of any type of frequency block, actively splitting the connection request into a plurality of streams, so that the sum of 1 and the number of service frequency slices required by each stream is equal to the size of c frequency blocks;
in the third step, when spectrum resources are allocated to each stream of the connection request, the stream is used by taking a frequency block as a unit, that is, each stream uses one frequency block;
step four: for each flow split in step three, at path PsdSearching an idle frequency block in the upper corresponding type frequency block section; if a plurality of idle frequency blocks exist, selecting the idle frequency block which enables the weighted occupancy index to be maximum;
step five: if all the streams in the connection request find the idle frequency blocks, the connection request is accepted by the network, and the found idle frequency blocks are used for establishing connection for each stream of the connection request; and if the stream of which the idle frequency block is not found exists in the connection request, rejecting the connection request.
2. The active multi-stream spectrum allocation method based on exponential partitioning frequency blocks in the elastic optical network according to claim 1, wherein the intermediate frequency block segment type C in the step one is determined according to the connection request with the largest spectrum requirement among all connection requests, and the number of service frequency slices required by the connection request with the largest bandwidth requirement is recorded as SmaxThen the spectrum needs to be divided into C frequency blocks, where C satisfies 2C≤Smax+1＜2C+1。
3. The active multi-stream spectrum allocation method according to claim 1, wherein the method for splitting streams in step three is as follows: if the number of the service frequency slices required by the connection request is S, if c exists1So that
The number of service frequency slices needed by the first flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
If it is not
The splitting process is finished, otherwise, the split stream is continuously split; if c is present2So that
The number of service frequency slices needed by the second flow is
The corresponding frequency block is
The number of service frequency slices needed by the rest of the connection request is
Repeating the steps until the number of the service frequency slices needed by the rest part is 0, ending the splitting process, wherein c1、c2Is one of any c kinds of frequency blocks.
4. The active multiflow spectrum allocation method according to claim 1 or 3, wherein the weighted occupancy indicator of each idle frequency block in the fourth step is a-BN+b·BRWherein B isNRepresentation and path PsdThe number of occupied corresponding frequency blocks on the adjacent link, BRRepresentation and path PsdThe number of occupied corresponding frequency blocks on non-adjacent links, a and B are used for adjusting the number B respectivelyNAnd the number BRTwo common parameters of influence.
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