CN102055612A - Optimization method based on multiple spare cross layer resources - Google Patents

Optimization method based on multiple spare cross layer resources Download PDF

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CN102055612A
CN102055612A CN 201010585268 CN201010585268A CN102055612A CN 102055612 A CN102055612 A CN 102055612A CN 201010585268 CN201010585268 CN 201010585268 CN 201010585268 A CN201010585268 A CN 201010585268A CN 102055612 A CN102055612 A CN 102055612A
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lower floor
upper strata
gmpls
wdm
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曲桦
吴晓燕
赵季红
王力
张莹
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention discloses an optimization method based on multiple spare cross layer resources. According to the characteristics of paths through which a single hop service and a multiple hop service pass on a GMPLS (generalized multiprotocol label switching) layer, only WDM (wavelength division multiplex) layer protection is provided for the single hop service to ensure the reliable restoration of the single hop service when a WDM layer fails; a GMPLS layer protection path is provided for the multiple hop service necessarily, a multiple spare idea is introduced, and an idle and unprotected method is provided for a multiple hop high level service (HS) to cope with the simultaneous failure of a router and an optical fiber link, and ensure the timely restoration of the high level service when a node or a link fails; a multiple hop middle level service (MS) can bear less pack loss and longer time delay relatively to the high level service, only GMPLS layer protection is provided for a multiple hop low level service (LS), and the used GMPLS layer resources and the used WDM layer resources are reduced; and the maximal share of network resources is realized, the utilization ratio of the network resources is improved, the configuration cost of the network resources is reduced, and the optimum configuration of the network resources is realized.

Description

Based on multiple can be standby stride a layer method for optimizing resources
Technical field
The invention belongs to the communications field, relate to a kind of multiple can be standby stride a layer method for optimizing resources, be applicable to that each layer resource has bearing relation and the multitiered network that requires independently to distribute in, require to satisfy the survivability characteristic of different business simultaneously, and the situation (as GMPLS over WDM network) of optimizing Internet resources.
Background technology
The development of Internet and the surge of data service impel modern communication networks to develop towards the multitiered network direction of many technology, multi-level, multi-service, high bandwidth, and the survivability design of network also highlights thereupon.Resource optimization is as a most key aspect of network survivability, rational each layer resource in the distribution network, and improving utilization rate of network resource is problem demanding prompt solution.Because each layer technology all has different survivability characteristics in the network, survivability reasonable in design just must be coordinated and distribute rationally the survivability technology of each layer.The key of survivability design has: multilayer survivability policy co-ordination and multilayer network resource optimization design, only consider the latter here.
Existing network resource optimization method and not enough as follows:
(1) utilizing ILP (integral linear programming) method is optimization aim to reduce Internet resources configuration cost.MPLS over OTN network utilisation ILP compares three kinds of network resource optimization methods in individual layer and the multilayer, obtain Interlayer BRS method and can reach nearly 37% the saving of Internet resources, improve the maximum of each layer standby resources in the network effectively and shared, realized the optimization of Internet resources.The shortcoming of the method has: all the professional Interlayer BRS methods of using to access network, and improved the maximum of Internet resources and shared, but traffic differentiation has not been treated, increased the redundancy of resource distribution; InterlayerBRS method itself exists not enough; promptly regard the light path of carrying MPLS layer standby resources as extra business (can be seized, unprotect) at photosphere; yet when OXC breaks down in the network; the upper strata can't utilize it to recover after photosphere recovered to take this resource, caused upper-layer service to be interrupted.Therefore this method is not suitable for real-time and the demanding business of recovery rate;
(2) utilize heuritic approach (as SSR, genetic algorithm etc.) and Interlayer BRS method that the idling-resource distribution method in the network is carried out.Utilize the SSR heuritic approach can find approximate optimization solution fast, and the error of itself and branch and bound method is less than 5%, network node increases time error can be littler, so this method is applicable in the large scale network.The shortcoming that exists is the defective that does not have differentiated service survivability and Interlayer BRS method itself, and this method adopts near-optimal bigger at the less time error of network size in addition.
(3) reasonably optimizing that layer survivability mapping method realized Internet resources is striden in utilization.Network is divided into three levels (cover layer, IP layer, WDM layer), is optimized, realized effective utilization of Internet resources by the matrix mapping mode that adopts upper strata link and lower floor's link.This method is at the single link failure situation, and the mapping between the two-layer link will be complicated more when network node increases, and does not also consider professional different survivability requirements simultaneously.
Therefore, network resource optimization configuration reasonable in design must be accomplished: 1) traffic differentiation is treated, satisfied the survivability demand of every class business; 2) reasonably shine upon each interlayer resource, reduce resources in network and distribute redundancy, optimize the configuration cost of Internet resources.
Summary of the invention
The object of the present invention is to provide a kind ofly guaranteeing that the different business survivability has realized that the maximum of Internet resources shares under requiring, realize Internet resources best configuration based on multiple can be standby stride a layer method for optimizing resources.
For achieving the above object, the technical solution used in the present invention is:
1) with business with lsp k(s, d, b, form t) is linked in the multitiered network;
2) GMPLS layer in upper strata sets up the wLSP route for all business that insert multitiered network, and corresponding upper strata GMPLS layer operating path wLSP is provided, and the assignment resource is ∑ W Ij, utilizing ILP simultaneously is the optimization that upper strata GMPLS layer working resource carried out in integral linear programming, the optimization formula is Min:C LP∑ W Ij);
3) for upper strata GMPLS layer operating path wLSP distributes corresponding upper strata GMPLS layer protection path pLSP, the upper strata resource conservation that GMPLS layer protection path pLSP distributes being provided for all multi-hop business is ∑ S Ij, the single-hop business only provides the WDM of lower floor layer protection light path, utilizes the ILP method to carry out the optimization of upper strata GMPLS layer resource conservation simultaneously, and the optimization formula is Min:C LP∑ S Ij);
4) WDM of the lower floor layer working light path wLP1 that carries it is provided for upper strata GMPLS layer operating path wLSP, the resource of distribution is W4; The WDM of the lower floor layer working light path that carries it is provided for the upper strata GMPLS layer protection path pLSP of the high-grade professional HS of multi-hop, the resource of distribution is W2; The WDM of the lower floor layer working light path that carries it is provided for the upper strata GMPLS layer protection path pLSP of professional MS of multi-hop middle grade and the professional LS of multi-hop inferior grade, the resource of distribution is W3, and the total working resource of lower floor's WDM layer is ∑ (W 2+ W 3+ W 4), utilize the ILP method to carry out the optimization of the WDM of lower floor layer working resource simultaneously, the optimization formula is MinC λ∑ (W 2+ W 3+ W 4);
5) at the WDM of lower floor layer, corresponding protection light path pLP is provided for the working light path of the upper strata GMPLS layer working light path of the non-multi-hop inferior grade LS of carrying, distributing the WDM of lower floor layer resource is P; By multiple can standby thought, promptly use simultaneously the interlayer standby resources share and layer in a standby resources share a method, make the resource conservation of the WDM of lower floor layer become (P-W 3-S 2), wherein S2 refers to that part of resource that standby resources is shared in the WDM of lower floor layer uses layer, utilizes the ILP method to carry out the optimization of the WDM of lower floor layer resource conservation simultaneously, the optimization formula is Min:C λ∑ (P-W 3-S 2).
Described multitiered network refers to the two-tier network be made up of upper strata GMPLS layer and lower floor's WDM layer; Forming upper strata GMPLS layer by LSR directly links to each other with lower floor WDM layer, lower floor is the mesh network that is connected to form by OXC and the WDM of lower floor link end to end, LSR and OXC had one-to-one relationship between this was two-layer, professional form with LSP exists on the upper strata, and must could realize transmission through the carrying of lower floor.
Described multiple can standby thought refer to multilayer network resource divide timing use simultaneously the interlayer standby resources share and layer in standby resources shared; Lower floor's working light path of the shared finger carrying of interlayer standby resources upper strata protection light path and other protection light path of lower floor are shared, and a standby resources is shared and refer to that lower floor protects light path to share when the working light path of their correspondences is had nothing to do in layer.
Different survivabilities according to business in multitiered network require business is divided three classes: high-grade professional HS refers to comprise that VoIP and multimedia key business, remote data base transaction, crucial control terminal and ecommerce are to real-time, the demanding business of business recovery rate, when Resource Allocation in Networks, provide 100% recovery to it, and adopt idle unprotect method; The professional MS of middle grade: comprise that application service provides (ASP), standard VoIP and multimedia application, low, not high with respect to professional its desired recovery rate of HS to delay requirement, when Resource Allocation in Networks, adopt Interlayer BRS method; The professional LS of inferior grade: comprise Email, FTP or general web page browsing function; provide the LSP level protection on upper strata to it; only simply carry in lower floor, other protection light paths are shared in lower floor's working light path of the upper strata protection of permission carrying simultaneously light path and the lower floor.
Described single-hop business refer to professional on the GMPLS layer of upper strata the logical node of process be 2 business, it is not subjected to the intermediate router fault effects, and the protection of upper strata GMPLS layer only is provided when resource allocation, carries accordingly and shares at lower floor's WDM layer; The multi-hop business refers to that professional the logical node of process is greater than 2 business on the GMPLS layer of upper strata, and it is subjected to the intermediate router fault effects, so must provide the protection of upper strata GMPLS layer to all business.
The present invention be under the multitiered network model, adopt based on multiple can be standby stride a layer method for optimizing resources, consider that at first professional different survivability demands are divided three classes the multi-hop business, and be the different resource allocation methods of the professional employing of every class, by introducing multiple thought that can be standby, guaranteeing that the different business survivability has realized that the maximum of Internet resources is shared under requiring, and realizes the best configuration of Internet resources.The single-hop business is not subjected to the intermediate router fault effects, and the protection of GMPLS layer only is provided when resource allocation, carries accordingly and shares at the WDM layer; The logical node of multi-hop business process on the GMPLS layer is greater than 2 business, and it is subjected to the intermediate router fault effects, so all business of giving provide the protection of GMPLS layer.High-grade business (HS) requires high to real-time, business recovery rate, when Resource Allocation in Networks, to its recovery that provides 100%, adopt idle unprotect method; Middle grade business (MS) is low with respect to the professional desired recovery rate of HS, delay requirement is not high, when Resource Allocation in Networks, adopts Interlayer BRS method; Inferior grade business (LS) only provides the upper strata protection, only simply carries in lower floor, and other protection light paths are shared in lower floor's working light path of the upper strata protection of permission carrying simultaneously light path and the lower floor.
Description of drawings
Fig. 1 is the multitiered network illustraton of model, and it is the GMPLS layer at the middle and upper levels, and lower floor is the WDM layer;
Fig. 2 is based on the business classification of Diffserv model;
Fig. 3 is based on the multiple flow chart of striding a layer method for optimizing resources (DROMHN) that can be standby;
Fig. 4 is the optimization figure of resource allocation in the simple network;
Fig. 5 is the resource map that distributes in the simple network.
Among literary composition and the figure: WDM, wavelength division multiplexing; GMPLS, the exchange of general multiple protocols label; LSP, label switched path; Interlayer BRS, interlayer standby resources are shared; Standby resources is shared in Intralayer BRS, the layer.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
For performance of the present invention is described, under the static network configuration, in the multitiered network model, utilizes and carry out resource optimization based on the multiple layer method for optimizing resources of striding that can be standby.Analyze by network resource optimization figure and to draw conclusion of the present invention business shown in Figure 4.
In multitiered network, must just can carry out through the carrying of the WDM of lower floor layer during the transmission of the business of upper strata GMPLS layer as can be seen from Figure 1.Multi-hop business with the carrying of LSP form in the GMPLS layer of upper strata all provides corresponding work light path and protection light path, and the single-hop business provides the corresponding work light path; The WDM of lower floor layer is that all working light path and the protection light path of upper strata GMPLS layer carried; and to carrying all light paths distribution corresponding protection light paths of upper strata working light path; Resource Allocation in Networks occurs redundant as can be seen; when using Interlayer BRS method between node 1-4 pLP1 and wLP3 can share same wavelength resource; pLP2 and wLP3 share same wavelength resource between node 3-4; use pLP1 and shared same the wavelength resource of pLP3 between Intralayer BRS method node 2-4; this shows and use the multiple thought optimization that can effectively improve Internet resources that can be standby, reduce the resource allocation redundancy.
As can be seen from Figure 2 should be according to the classification Resources allocation of business to the WDM layer on based on the basis of Fig. 1: the high-grade business of multi-hop (HS) adopts idle unprotect method, requires not allow it to use Interlayer BRS method in order to guarantee professional survivability; Multi-hop middle grade business (MS) adopts the InterlayerBRS method can improve utilization rate of network resource; Multi-hop inferior grade business (LS) only provides GMPLS protection; The single-hop business only is subjected to WDM layer fault effects, for it provides the protection of WDM layer; Adopt Intralayer BRS method that the utilance of WDM layer resource can further be provided.
Referring to Fig. 3, detailed process of the present invention is as follows:
1) with business with lsp k(s, d, b, form t) is linked in the multitiered network;
2) GMPLS layer in upper strata sets up the wLSP route for all business that insert multitiered network, and corresponding upper strata GMPLS layer operating path wLSP is provided, and the assignment resource is ∑ W Ij, utilize ILP (Integer Linear programming, integral linear programming) to carry out the optimization of upper strata GMPLS layer working resource simultaneously, the optimization formula is Min:C LP∑ W Ij);
3) for upper strata GMPLS layer operating path wLSP distributes corresponding upper strata GMPLS layer protection path pLSP, the upper strata resource conservation that GMPLS layer protection path pLSP distributes being provided for all multi-hop business is ∑ S Ij, the single-hop business only provides the WDM of lower floor layer protection light path, utilizes the ILP method to carry out the optimization of upper strata GMPLS layer resource conservation simultaneously, and the optimization formula is Min:C LP∑ S Ij);
4) WDM of the lower floor layer working light path wLP1 that carries it is provided for upper strata GMPLS layer operating path wLSP, the resource of distribution is W4; The WDM of the lower floor layer working light path that carries it is provided for the professional upper strata GMPLS layer protection path pLSP of the high-grade professional HS of multi-hop (High Level Services), the resource of distribution is W2; The WDM of the lower floor layer working light path that carries it is provided for the upper strata GMPLS layer protection path pLSP that multi-hop middle grade business MS (Medium Level Services) is professional and the professional LS of multi-hop inferior grade (Low Level Services) is professional; the resource of distributing is W3, and the total working resource of WDM layer is ∑ (W 2+ W 3+ W 4), utilize the ILP method to carry out the optimization of the WDM of lower floor layer working resource simultaneously, the optimization formula is MinC λ∑ (W 2+ W 3+ W 4);
5) at the WDM layer, corresponding protection light path pLP is provided for the working light path of the upper strata GMPLS layer working light path of the non-multi-hop inferior grade LS of carrying, distributing the WDM of lower floor layer resource is P; By use multiple can standby thought, promptly use simultaneously the interlayer standby resources share and layer in a standby resources share a method, make the resource conservation of the WDM of lower floor layer become (P-W 3-S 2), wherein S2 refers to that part of resource that standby resources is shared in the WDM of lower floor layer uses layer, utilizes the ILP method to carry out the optimization of the WDM of lower floor layer resource conservation simultaneously, the optimization formula is Min:C λ∑ (P-W 3-S 2).
Multitiered network refers to the two-tier network be made up of upper strata GMPLS layer and lower floor's WDM layer among the present invention; Form the GMPLS layer by LSR and directly link to each other with lower floor WDM layer, lower floor is the mesh network that is connected to form by OXC and WDM link end to end, and LSR and OXC had one-to-one relationship between this was two-layer.Professional form with LSP exists on the upper strata, and must could realize transmission through the carrying of lower floor.
Multiple can standby thought refer to multilayer network resource divide timing use simultaneously the interlayer standby resources share and layer in standby resources shared; Lower floor's working light path of the shared finger carrying of interlayer standby resources upper strata protection light path and other protection light path of lower floor are shared, and a standby resources is shared and refer to that lower floor protects light path to share when the working light path of their correspondences is had nothing to do in layer.
Different survivabilities according to business in multitiered network require business is divided three classes: high-grade professional HS refers to comprise that VoIP and multimedia key business, remote data base transaction, crucial control terminal and ecommerce are to real-time, the demanding business of business recovery rate, when Resource Allocation in Networks, provide 100% recovery to it, and adopt idle unprotect method; The professional MS of middle grade: comprise that application service provides (ASP), standard VoIP and multimedia application, low, not high with respect to professional its desired recovery rate of HS to delay requirement, when Resource Allocation in Networks, adopt Interlayer BRS method; The professional LS of inferior grade: comprise Email, FTP or general web page browsing function; provide the LSP level protection on upper strata to it; only simply carry in lower floor, other protection light paths are shared in lower floor's working light path of the upper strata protection of permission carrying simultaneously light path and the lower floor.
The single-hop business refer to professional on the GMPLS layer of upper strata the logical node of process be 2 business, it is not subjected to the intermediate router fault effects, and the protection of upper strata GMPLS layer only is provided when resource allocation, carries accordingly and shares at lower floor's WDM layer; The multi-hop business refers to that professional the logical node of process is greater than 2 business on the GMPLS layer of upper strata, and it is subjected to the intermediate router fault effects, so must provide the protection of upper strata GMPLS layer to all business.
Fig. 4 is professional network resource optimization figure.
Fig. 5 is the resource situation of distributing in the network.
Below result of use figure of the present invention is described:
Shown in Figure 4 have in four service access networks; solid line and dotted line are represented working resource and the resource conservation in the network respectively; the GMPLS layer that is made of LSR (LSR) is represented on the upper strata; lower floor represents the mesh network that linked to each other with the WDM link and constituted by OXC (optical cross-connect); be called the WDM layer, upper strata LSR and the OXC of lower floor are one to one.Lower floor's solid rim is represented sharable resource in the photosphere, comprises that the interlayer standby resources is shared and the interior standby resources of layer shared.Wherein lsp1, lsp2, lsp3 represent high (HS) in the multi-hop business, medium (MS) and inferior grade (LS) business respectively; provide idle unprotect method, Interlayer BRS to share method, the guard method of GMPLS layer respectively; lsp4 represents the single-hop business; at the WDM layer all business are all adopted Intralayer BRS method; further improve in the multitiered network in the interlayer and layer a resource and farthest share, realized multiple can be standby stride a layer resource optimization.
By Fig. 4 and Fig. 5 as can be seen, professionally adopt idle unprotect method can guarantee that 100% of high-grade business recovers for multi-hop is high-grade; Adopt the interlayer standby resources to share the resource-sharing that can improve network for multi-hop middle grade business, because its survivability requirement is more much lower than high-grade, also can satisfy the survivability requirement of multi-hop middle grade business simultaneously; Need not to provide protection at the WDM layer because the survivability of itself requires only to provide the protection scheme of GMPLS layer to it for the multi-hop inferior grade is professional, reduced the use of upper strata working resource the resource of carrying its upper strata working light path; Use Intralayer BRS method, further improved the utilance of resource in the multitiered network.As seen this method has improved utilization rate of network resource effectively, has realized the optimization of each layer resource in the network, meets that following optical-fiber network is multi-level, the demand for development of many technology.

Claims (5)

  1. One kind based on multiple can be standby stride a layer method for optimizing resources, it is characterized in that may further comprise the steps:
    1) with business with lsp k(s, d, b, form t) is linked in the multitiered network;
    2) GMPLS layer in upper strata sets up the wLSP route for all business that insert multitiered network, and corresponding upper strata GMPLS layer operating path wLSP is provided, and the assignment resource is ∑ W Ij, utilizing ILP simultaneously is the optimization that upper strata GMPLS layer working resource carried out in integral linear programming, the optimization formula is Min:C LP∑ W Ij);
    3) for upper strata GMPLS layer operating path wLSP distributes corresponding upper strata GMPLS layer protection path pLSP, the upper strata resource conservation that GMPLS layer protection path pLSP distributes being provided for all multi-hop business is ∑ S Ij, the single-hop business only provides the WDM of lower floor layer protection light path, utilizes the ILP method to carry out the optimization of upper strata GMPLS layer resource conservation simultaneously, and the optimization formula is Min:C LP∑ S Ij);
    4) WDM of the lower floor layer working light path wLP1 that carries it is provided for upper strata GMPLS layer operating path wLSP, the resource of distribution is W4; The WDM of the lower floor layer working light path that carries it is provided for the upper strata GMPLS layer protection path pLSP of the high-grade professional HS of multi-hop, the resource of distribution is W2; The WDM of the lower floor layer working light path that carries it is provided for the upper strata GMPLS layer protection path pLSP of professional MS of multi-hop middle grade and the professional LS of multi-hop inferior grade, the resource of distribution is W3, and the total working resource of lower floor's WDM layer is ∑ (W 2+ W 3+ W 4), utilize the ILP method to carry out the optimization of the WDM of lower floor layer working resource simultaneously, the optimization formula is MinC λ∑ (W 2+ W 3+ W 4);
    5) at the WDM of lower floor layer, corresponding protection light path pLP is provided for the working light path of the upper strata GMPLS layer working light path of the non-multi-hop inferior grade LS of carrying, distributing the WDM of lower floor layer resource is P; By multiple can standby thought, promptly use simultaneously the interlayer standby resources share and layer in a standby resources share a method, make the resource conservation of the WDM of lower floor layer become (P-W 3-S 2), wherein S2 refers to that part of resource that standby resources is shared in the WDM of lower floor layer uses layer, utilizes the ILP method to carry out the optimization of the WDM of lower floor layer resource conservation simultaneously, the optimization formula is Min:C λ∑ (P-W 3-S 2).
  2. 2. according to claim 1 based on multiple can be standby stride a layer method for optimizing resources, it is characterized in that: described multitiered network refers to the two-tier network be made up of upper strata GMPLS layer and lower floor's WDM layer; Forming upper strata GMPLS layer by LSR directly links to each other with lower floor WDM layer, lower floor is the mesh network that is connected to form by OXC and the WDM of lower floor link end to end, LSR and OXC had one-to-one relationship between this was two-layer, professional form with LSP exists on the upper strata, and must could realize transmission through the carrying of lower floor.
  3. 3. according to claim 1 based on multiple can be standby stride a layer method for optimizing resources, it is characterized in that: described multiple can standby thought refer to multilayer network resource divide timing use simultaneously the interlayer standby resources share and layer in standby resources shared; Lower floor's working light path of the shared finger carrying of interlayer standby resources upper strata protection light path and other protection light path of lower floor are shared, and a standby resources is shared and refer to that lower floor protects light path to share when the working light path of their correspondences is had nothing to do in layer.
  4. 4. according to claim 1 based on multiple can be standby stride a layer method for optimizing resources, it is characterized in that: the different survivabilities according to business in multitiered network require business is divided three classes: high-grade professional HS refers to comprise that VoIP and multimedia key business, remote data base transaction, crucial control terminal and ecommerce are to real-time, the demanding business of business recovery rate, when Resource Allocation in Networks, provide 100% recovery to it, and adopt idle unprotect method; The professional MS of middle grade: comprise that application service provides (ASP), standard VoIP and multimedia application, low, not high with respect to professional its desired recovery rate of HS to delay requirement, when Resource Allocation in Networks, adopt Interlayer BRS method; The professional LS of inferior grade: comprise Email, FTP or general web page browsing function; provide the LSP level protection on upper strata to it; only simply carry in lower floor, other protection light paths are shared in lower floor's working light path of the upper strata protection of permission carrying simultaneously light path and the lower floor.
  5. 5. according to claim 1 based on multiple can be standby stride a layer method for optimizing resources, it is characterized in that: described single-hop business refers to that business logical node of process on the GMPLS layer of upper strata is 2 business, it is not subjected to the intermediate router fault effects, the protection of upper strata GMPLS layer only is provided when resource allocation, carries accordingly and share at lower floor's WDM layer; The multi-hop business refers to that professional the logical node of process is greater than 2 business on the GMPLS layer of upper strata, and it is subjected to the intermediate router fault effects, so must provide the protection of upper strata GMPLS layer to all business.
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CN103973491A (en) * 2014-05-09 2014-08-06 北京智谷睿拓技术服务有限公司 Fault processing method, optical layer control network element and IP layer control network element
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Application publication date: 20110511