Handoff is a key element in the wireless cellular networks in order to provide Quality of Service (QoS) to the users and to support users’ mobility. Handoff failure will result in the forced termination of an ongoing call. From the user’s point of view, the service of a handoff request is more important, as the forced termination of an ongoing call is more annoying than the blocking of new calls. Therefore, in order to support QoS to the users and to provide ubiquitous coverage, the handoff procedure should be further investigated. The aim of this lecture is to provide a comprehensive survey of the basic elements, the different types and phases of the handoff procedure.

Also, one of the major problems in wireless multihop networks is the scheduling of transmissions in a fair and efficient manner. Time Division Multiple Access (TDMA) seems to be one of the dominant solutions to achieve this goal, since it is a simple scheme and can prolong the devices’ lifetime, by allowing them to transmit only portion of the time during conversation. For that reasons several TDMA scheduling algorithms may be found in the literature. In the scope of this talk present a classification of the existing TDMA scheduling algorithms based on several factors, i.e. the entity that is scheduled, the network topology information that is needed in order to produce or maintain the schedule and the entity/entities that perform the computing for producing and maintaining the schedules, and to discuss the advantages and disadvantages of each category.

About Dimitrios D. Vergados

Dimitrios D. Vergados [vergados@unipi.gr] is Ass. Professor in the Department of Informatics, University of Piraeus. He has held position as a Lecturer in the Department of Informatics, University of Piraeus and in the Department of Information and Communication Systems Engineering, University of the Aegean. He received his B.Sc. from the University of Ioannina and his Ph.D. from the National Technical University of Athens, Department of Electrical and Computer Engineering.

His research interests are in the area of Communication Networks (Wireless Broadband Networks, Sensor Networks, Ad-hoc Networks, WLANs, IMS, Mesh Networks), Neural Networks, Cloud Computing and Green Technologies, and Computer Vision. He has participated in several projects funded by EU and National Agencies and has several publications in journals, books and conference proceedings. He has served as a committee member and evaluator in National and International Organizations and Agencies and as a chair and a Technical Program Committee member in several international conferences. He is a member of the editorial board and a reviewer in several journals. He is an IEEE Senior Member.

El evento se impartirá en inglés