Resource equalization virtual optical network mapping method based on time-frequency fragment awareness

Abstract

The invention relates to a resource equalization virtual optical network mapping method based on time-frequency fragment awareness, belonging to the technical field of optical fiber communication. Inthe method provided by the invention, a weight formula of a physical node and a physical link is designed, and time and bandwidth resource in a network are weighed while a virtual network request is mapped, thus, bandwidth blocking rate of a virtual request service is reduced, and resource utilization rate in the network is improved; in a process of allocating spectrums for the virtual request service, fragmentation degree of a frequency slot on the link in a physical network in a time domain and a spectrum domain is considered, a spectrum block which has low fragmentation degree in the network after allocation is selected to server the service, and thus, spectrum fragments generated on a service transmission path are reduced. The invention provides the resource equalization virtual optical network mapping method based on time-frequency fragment awareness, the method not only can effectively reduce bandwidth blocking rate in the network and realize equilibrium distribution of the resource in the network, but also improves utilization rate of the spectrum resource in the network.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a resource-balanced virtual optical network mapping method based on time-frequency joint fragment perception. Background technique [0002] With the rapid development of the Internet, traditional wavelength division multiplexing (Wavelength Division Multiplexing, WDM) networks can no longer meet the growing demand for business bandwidth, and elastic optical networks (Elastic Optical Networks, EONs) rely on its high bandwidth capacity, low latency , low power consumption, fine-grained and other advantages are considered to be a promising next-generation optical transport network, but with the increase of business requirements, various problems have been exposed in the network architecture, which has led to the stagnation of the Internet rigid situation. Network virtualization technology is considered to be one of the key technologies to solve the problem of Inte...

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Problems solved by technology

[0004] Then, during the virtual network mapping process, the problem of unbalanced resource allocation in the physical network leads to unbalanced allocation of computing resources on nodes in the physical network and bandwidth resources on physical links, resulting in uneven resource consumption in the network. In a dynamic network environment, due to the different sizes and durations of services, and with the dynamic arrival and departure of services, the traditional FirstFit (FF) spectrum allocation algorithm does not consider the departure time between adjacent services, so there will be Different degrees of spectrum fragmentation make the bandwidth resources in the network discrete, causing services to be blocked due to insufficient resources

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