A collaborative mapping method for node importance-aware transparent virtual optical network

Abstract

The invention relates to a transparent virtual optical network collaborative mapping method for node importance perception, and belongs to the technical field of optical fiber communication. In the virtual network node mapping stage, the method designs the importance measurement formulas of virtual nodes and physical nodes, comprehensively evaluates the proximity of unmapped nodes and mapped nodes, and the spectral density of mapped paths; and adopts the node-link cooperative mapping method , while successfully mapping a pair of adjacent virtual nodes, immediately map the virtual optical link between them, and allocate spectrum resources on the mapped physical path. The present invention transmits more virtual optical network services by using fewer spectrum resources, reduces link spectrum fragmentation and enhances the compactness of node mapping, improves network operators' income, and shortens the length of virtual optical link mapping. The service quality of the business is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a transparent virtual optical network collaborative 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 like mushrooms after rain, such as video on demand, smart home, mobile technology, etc., resulting in explosive growth of network data traffic, giving transmission bandwidth (spectrum) The communication backbone network with limited resources has brought continuous and huge challenges. Compared with the wavelength division multiplexing network with coarse wavelength allocation granularity, the elastic optical network based on optical orthogonal frequency division multiplexing technology can exactly meet the bandwidth request for service allocation by using optical devices with variable bandwidth and finer allocation granulari...

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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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