A Cooperative Mapping Method for Virtual Optical Network Based on Spectrum Dispersion Awareness

Abstract

The invention relates to a virtual optical network cooperative mapping method based on spectrum dispersion perception, and belongs to the technical field of optical fiber communication. When the method selects the route according to the weight of the physical node, the node weight considers the remaining computing resources and the geographical location of the physical node in the whole network topology, and the balanced use of the computing resources of multiple physical nodes is achieved by adjusting the weight factor. In spectrum allocation, in order to reduce the number of spectrum usage and spectrum fragmentation, the link spectrum dispersion formula and the criterion for determining the overloaded link are designed in the mapping process. Combined with the location of the mapped physical nodes, the number of spectrum usage on the candidate optical path is calculated. According to the spectral dispersion degree of the link, the optical path with less consumption frequency slots and low spectral dispersion degree is selected for cooperative mapping with its adjacent physical nodes. The invention improves the bandwidth utilization rate and reduces the network blocking rate.

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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