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Shared protection routing and spectrum allocation method considering joint fault probability constraints
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A technology of shared protection and failure probability, applied in the field of communication, can solve problems such as joint failure probability evaluation of no working path and protection path
Active Publication Date: 2017-07-28
SUZHOU UNIV
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[0006] It can be seen that in the spectrum flexible optical network, although the above two aspects solve the routing and spectrum allocation problems of service requests, they do not evaluate the joint failure probability of the working path and protection path established by the service request.
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Embodiment 1
[0093] Such as figure 1 As shown, this embodiment considers the shared protection routing and spectrum allocation method with joint failure probability constraints, including:
[0094] Initialize the spectrum flexible optical network G(V, E, F), where V, E, and F respectively represent the set of all optical switching nodes, the set of all opticalfiber links, and all the spectrum of each optical fiber link in the spectrum flexible optical network Gap set, that is, V={v 1 ,v 2 ,...,v k ,...,v |V|}, E={e 1 ,e 2 ,...,e k ,...,e |E|}, F={1,2,...,f k ,..., f |F|}; |V|, |E|, |F| represent the number of optical switching nodes, the number of fiber links, and the number of spectrum slots in the spectrum flexible optical network respectively; set the failure probability of each fiber link in the spectrum flexible optical network, where the e k The failure probability of a fiber link is Generate a set of business requests TD, where each business request uses TD(s,d,FS s,d...
Embodiment 2
[0138] Such as figure 2 As shown, this embodiment considers the shared protection routing and spectrum allocation system with joint failure probability constraints, including: a service request generation module, a configuration module for working paths and shared protection paths, a joint failure probability calculation module for shared protection, and a multi-objective optimization function module, a multi-objective optimization function constraint management module, and an objective function optimization solution storage module;
[0139]The service request generation module is used to generate a group of service requests, including source nodes, destination nodes, bandwidth requirements, and maximum tolerable failure probability thresholds of service requests; wherein, each service request uses TD(s, d, FS s,d ,MTFP s,d )∈TD, where s and d represent the source node and destination node of the service request respectively, and s≠d, FS s,d Represents the bandwidth require...
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Abstract
The invention relates to a shared protection routing and spectrum allocation method and system considering joint fault probability constraints for reducing the fault risk of service requests in a spectral flexible optical network. The method comprises the following steps of firstly, initializing a spectral flexible optical network G(V, E, F); secondly, generating a group of service requests; and lastly, setting an adjustable parameter alpha and spectral maximum sharing degree, multi-objective optimization functions for shared protection routing and spectrum allocation based on the joint fault probability constraints, and a bandwidth flow conservation constraint condition for the service requests, a spectral consistency constraint condition, a spectral continuity constraint condition, a working path and shared protection path pair selection uniqueness constraint condition, a spectral gap occupation uniqueness constraint condition, a spectrum sharing constraint condition, a spectral gap maximum sharing degree constraint condition and a maximum tolerable fault probability threshold constraint condition which meet the multi-objective optimization functions, and obtaining an optimal solution of spectrum resource occupancy and joint fault probability.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for sharing protection routing and frequency spectrum allocation considering joint failure probability constraints. Background technique [0002] In the spectrum flexible optical network, on the one hand, in order to improve the utilization of optical network resources, make full use of the bandwidth requirements of spectrum resources to carry services, so as to ensure the maximum throughput of the spectrum flexible optical network; on the other hand, in order to ensure the service transmission process In terms of quality of service, each service request needs to be equipped with a transmission working path and a backup protection path to reduce the service interruption caused by the failure of the spectrum flexible optical network. Compared with the protection method of traditional wavelength division multiplexing (WDM) optical network, spectrum flexib...
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