Konstantinos ALEXANDRIS - PhD Student - Communications Systems Communication systems
Date: - Location: Eurecom
Abstract : In this work we propose a novel handover (HO) algorithm, that considers system performance from both user and network perspective, in the context of heterogeneous networks (HetNets), i.e., networks composed of BSs with asymmetrical transmission power. In such an environment, conventional HO algorithms that consider only the user perspective, e.g., received signal strength (RSS)-based, might offer suboptimal performance, since they mainly push users to cells with high transmission powers. Thus, new algorithms that take into account also the network perspective, e.g., cell load, are needed. In this work, a load-aware algorithm is proposed considering the service delay that a user experiences from the network. In addition, an implementable framework based on Software Defined Networking (SDN) architecture is sketched to support the algorithm. The proposed algorithm is compared with the traditional one we meet in long-term evolution (LTE) systems and a distancebased one. Extracted cell assignment probability and user service delay performance results show that the load-aware approach outperforms both of them. Biography: Konstantinos Alexandris received his Diploma and M.Sc. degrees in Electronic and Computer Engineering with distinction from the Technical University of Crete, Greece, in 2012 and 2014, respectively. He worked at the Telecommunications Circuit Laboratory (TCL) of Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland, as a Research Assistant for 8 months. He is currently a PhD candidate in the Mobile Communications Department at EURECOM, France. His research interests lie in the areas of software-defined networking, wireless cellular networks, wireless communications and software-defined radio implementations. In parallel with his research, he is currently working on Eurecom’s experimental software radio platform, OpenAirInterface (OAI). He has received fellowship awards for his undergraduate studies and he was the recipient of the 2012- 2013 best Diploma Thesis Award on “Advanced Wireless Systems,” presented by the IEEE Vehicular Technology Society (VTS) and Aerospace & Electronic Systems Society (AESS) joint Greece Chapter. At the end of 2015, he was awarded as exemplary reviewer for IEEE Wireless Communications Letters.