Browsing by Author "Hernando, Gorka"
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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 Implementation and comparison of AODV and OLSR routing protocols in an ad-hoc network over bluetooth(2009) Hernando, Gorka; Cabero, José María; Jodrá, José Luis; Pérez, Susana; Tecnalia Research & Innovation; GENERALAd-Hoc networking is one of the most impacting architectures in the development of the Future Internet, where the nodes are expected to be wireless and mobile. Unlike the traditional IP-based and simulation-based approaches inside the Ad-Hoc research field, this work presents a real implementation of proactive (OLSR) and reactive protocols (AODV) over real Bluetooth devices (non-IP approach) in static and dynamic scenarios. Along the paper we point out many handicaps that have been solved in order to make Bluetooth work as supporting technology (the need for a previously established connection to, the lack of broadcast messages, the overhead...). We have carried out a set of experiments to compare the potential and limitations of both protocols. This work was developed inside the Future Internet project supported by the Basque Government within the ETORTEK Programme and the FuSeN project supported by the Spanish Ministerio de Ciencia e Innovación.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