Virtual optical network synergetic mapping method based on spectrum dispersion sensing

Abstract

The invention relates to a virtual optical network synergetic mapping method based on spectrum dispersion sensing, and belongs to the technical field of the optical fiber communication. The method comprises the following steps: the node weight takes the residual computing resource size and an element of an occupied geographic location in the whole network topology by the physical node into consideration when the routing is selected according to the physical node weight, and the balanced use of multiple physical node computing resources is realized through regulating the weight factor. In the spectrum distribution, the link spectrum dispersion formula and a judgement criterion of a reloading link are designed in the mapping process for reducing the spectrum use amount and the spectrum fragments, the spectrum use amount and the link spectrum dispersion degree on a candidate optical path are computed by combining with a location of the mapped physical node, the optical path with less consumed frequency slot and low spectrum dispersion is selected to perform synergetic mapping with the adjacent physical node. Through the method disclosed by the invention, the bandwidth use ratio is improved, and the network blocking rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a virtual optical network collaborative mapping method based on spectrum dispersion perception. Background technique [0002] In recent years, with the continuous emergence of emerging services such as video conferencing, high-definition television, and cloud computing, the demand for network bandwidth resources has grown rapidly, and the traditional network architecture is facing severe challenges. The elastic optical network based on optical OFDM technology adopts a flexible bandwidth allocation method, divides bandwidth resources into smaller spectrum granularities, and adaptively allocates the number of frequency slots and selects modulation formats according to the size of services, thereby alleviating bandwidth. The pressure of resource scarcity. Network virtualization technology abstracts the resources of the underlying network into resource pools and al...

AI Technical Summary

Problems solved by technology

[0003] In the process of allocating resources for virtual network services, due to spectrum constraints in elastic optical networks, problems such as unbalanced spectrum resource allocation and insufficient resources lead to failure of virtual network service services and low success rate of virtual network mapping. In the environment, due to the different sizes and durations of services, and with the dynamic arrival and departure of services, the traditional first-hit spectrum allocation algorithm does not consider the departure time between adjacent services, so different degrees of spectrum fragmentation will be generated, resulting in service Blocked because spectrum resources cannot meet continuity

Traditional link mapping preferentially selects physical optical paths with rich spectrum resources for link mapping, which leads to unbalanced use of network resources and overloaded links, and may make the bandwidth resources in the network discrete, making it difficult to map virtual links. success

In addition, the two-stage mapping algorithm separates node mapping and link mapping, and does not take into account the degree of correlation between virtual nodes and virtual links. In practice, the result of node mapping affects link mapping to a certain extent. The evaluation of physical node resources and locations is very important

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