Browsing by Keyword "Virtualisation"
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Item Adaptive Weighted Round Robin (AWRR) scheduling for optimization of the wireless medium virtualisation(2010) Hernando, Gorka; Pérez, Susana; Cabero, José María; GENERAL; Tecnalia Research & InnovationNetwork virtualisation has been recently presented as a mean to overcome the saturation of the current Internet by sharing the same infrastructure by different network operators. This work considers virtualisation of the wireless medium, a way to share common network physical resources by different Virtual Operators based on a Time Division Multiple Access technique. We propose an Adaptive Weighted Round Robin scheduler as a means to optimize the assignment of time slots to each virtual operator and improve the performance of the system. End-to-end delay and packet loss are the metrics used in this paper to show the potential and limitations of wireless virtualisation as a way to increase the network usage. This research is presented as a simulation-based study developed over the widely used NS2 network simulator. Different scenarios and network topologies are considered in order to assess the benefits of using the proposed scheduler.Item Mobility-Aware Distributed Embedding (MADE) of virtual networks(2010) Hernando, Gorka; Pérez, Susana; Cabero, José María; GENERAL; Tecnalia Research & InnovationNetwork virtualisation has been recently presented as a mean to overcome the saturation of the current Internet by sharing the same infrastructure by different network operators. The efficient embedding of Virtual Networks in the physical substrate represents one of the main challenges associated to this technique, since it is necessary to set up a coordinated procedure to provide the requested set of resources in the most beneficial way. We propose a novel embedding protocol, designed in a distributed manner, and especially focused on solving the problems derived from the dynamicity of the nodes in mobile environments. Our Mobility-Aware Distributed Embedding (MADE) protocol applies the well known Path Splitting and Migration techniques in order to optimize the use of the physical resources. A simulation-based study lets us show the efficiency of our protocol and the good results in terms of acceptance and finalization of Virtual Networks. 1