A routing method for least-cost spectrum allocation and fragmentation awareness in elastic optical networks

Abstract

The invention relates to a reconfiguration routing mechanism based on minimum-cost spectrum allocation and fragment perception in an elastic optical network. According to the mechanism, spectrum allocation efficiency in a route is improved and spectrum fragments are reduced by a designed minimum-cost spectrum allocation model. During a route spectrum allocation process, link spectrum continuity of business is considered, and affect of the fragments is reduced and continuity of the available spectrum is furthest kept by minimizing size and duration time of the fragments. When the business is congested, the reconfiguration mechanism based on fragment perception is provided, and the network spectrum is further optimized while enough spectrum resources are provided for the congested business by selecting the routed business with the smallest fragments after reconfiguration via a defined reconfiguration gain computing model for reallocation. According to the reconfiguration routing mechanism based on minimum-cost spectrum allocation and fragment perception provided by the invention, a bandwidth congestion rate of a network can be effectively reduced, and a network spectrum resource utilization rate can be improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and relates to a routing method for minimum cost spectrum allocation and fragment perception in an elastic optical network. Background technique [0002] With the popularization of some applications such as high-definition television, 3D video on demand, e-learning and cloud computing, the demand for network bandwidth is growing exponentially. The traditional wavelength division multiplexing optical network (Wavelength Division Multiplexing, WDM) uses a fixed wavelength bandwidth allocation method, which cannot flexibly allocate bandwidth resources according to the actual bandwidth requirements of services, resulting in low spectrum utilization efficiency. The main performance is that when the bandwidth required by the business is less than one wavelength channel, the bandwidth of one wavelength is still allocated for the business; when the bandwidth requested by the business i...

AI Technical Summary

Problems solved by technology

The generation of spectrum fragments limits the further improvement of spectrum utilization

In addition, with the dynamic establishment and removal of optical paths, the spectrum in the network will be in a messy state after a period of time, and some idle spectrums cannot serve services due to lack of continuity. If these idle spectrum fragments are not sorted out, then Due to the dual constraints of spectrum continuity and spectrum adjacency that must be met in the spectrum allocation process, smaller spectrum fragment resources are difficult to be utilized, and new spectrum fragments are continuously generated, which threatens network resource utilization and causes network service quality to decline.

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