Node importance sensing transparent virtual optical network collaborative mapping method

Abstract

The invention relates to a node importance sensing transparent virtual optical network collaborative mapping method and belongs to the technical field of optical fiber communication. According to themethod, in a virtual network node mapping phase, virtual node and physical node importance measurement formulae are designed; the proximity of unmapped nodes and mapped nodes, and the spectrum compactness of mapping paths are comprehensively evaluated; and through adoption of a node-link collaborative mapping method, a pair of adjacent virtual nodes are mapped successfully, a virtual optical linkbetween the nodes is immediately mapped, and spectrum resources are allocated on a mapped physical path. According to the method, the relatively much virtual optical network service is transmitted with the relatively fewer spectrum resources, link spectrum fragments are reduced, the node mapping compactness is improved, profits of a network operator are improved, the mapping length of the virtualoptical links is reduced, and the quality of service of the service is ensured.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a transparent virtual optical network cooperative mapping method for node importance perception. Background technique [0002] In recent years, with the continuous development of the Internet, more and more new applications have sprung up, such as video-on-demand, smart home, mobile technology, etc., resulting in explosive growth of network data traffic, giving transmission bandwidth (spectrum) The inherently limited communication backbone network brings continuous and huge challenges. Compared with the wavelength division multiplexing network with coarse wavelength allocation granularity, the flexible optical network based on optical orthogonal frequency division multiplexing technology adopts variable bandwidth optical devices and finer distribution granularity, which can allocate services to exactly meet the bandwidth request Large and small sub-carriers have rea...

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Problems solved by technology

However, the current research on this problem generally has the following two problems: one is that the influence of the virtual node mapping stage on the link mapping nodes is ignored, and two adjacent virtual nodes are mapped to the underlying physical nodes that are far apart, resulting in Excessive spectrum resources are consumed in the link mapping stage, which deteriorates the network spectrum efficiency; secondly, the measurement of the importance of nodes is too simple, only considering the use of spectrum resources of the links around physical nodes, and cannot accurately evaluate the importance of nodes. To a certain extent, it is easy to cause node mapping to succeed but link mapping to fail due to the problem of path spectrum fragmentation

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