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Algorithm for Dynamic Resources Optimization in Network Virtualization

Author: ChenDongDong
Tutor: QuZhaoWei
School: Beijing University of Posts and Telecommunications
Course: Computer Science and Technology
Keywords: future network network virtualization virtualnodes re-configuration bandwidth re-use
CLC: TP393.01
Type: Master's thesis
Year: 2013
Downloads: 32
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Abstract


Network virtualization could address the ossification of the Internet, and is considered to be an important research method for the future network. Network virtualization is defined by decoupling the role of traditional ISPs into Infrastructure Providers (InPs) and Service Providers (SPs), and an important research in network virtualization is how to use the physical resources efficiently. This paper studies algorithm for dynamic resources optimization during the service of SPs, to improve the utilization of physical resources.Assigning physical resources among multiple virtual requests organized by SPs is called VN (virtual network) embedding problem. The environment for network virtualization changes constantly, which may broke the balance of resources utilization, even affecting the normal process of VN embedding. Re-configuring virtual networks could solve the problem efficiently, while consuming time cost and service disruption. This paper presents algorithm for virtual nodes re-configuration to solve the problem, re-configuring partly virtual nodes. The algorithm could not only reduce time consumption, but also balance utilization and improve the acceptance rate of virtual network requests, finally future improving the utilization of physical resources.Service providers are isolated from each other, to ensure that there is no conflict among network configurations, which could also bring some problem. For example, with the changes in the demand of bandwidth resources, there will produce a paradox between service providers:some SP may have a lager amount of idle bandwidth resources, and other SPs may require more bandwidth resources, while the isolation stops communication between each other. This paper presents an algorithm for dynamic bandwidth re-use, the algorithm could not violate the principle of isolation, and also incentive service provider with idle bandwidth resources to open up access to other service providers, to improve the utilization of physical link. Besides, the algorithm introduces the optimal auction mechanism, to maximize the revenue for sellers.

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