The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

Virtual Clustering in Cognitive Femtocells


Speaker: Prof. Laurence S. Dooley
Affiliation: The Open University, United Kingdom
Category: Colloquium
Location: Room 148, Faculty of Pure and Applied Sciences (FST-01), 1 University Avenue, 2109 Nicosia, Cyprus (directions)
Date: Wednesday, December 4, 2013
Time: 14:00-15:00 EET
Host: Andreas Pitsillides (

Cognitive femtocells are a fertile topic in cognitive radio and dynamic spectrum access research, with femtocell access points (FAP) being proposed as a cheap, plug-and-play solution for extending radio coverage in indoor environments, where conventional macrocell data services can suffer from poor signal quality. Despite their attraction, FAP pose many technical challenges due to uncoordinated user positioning which makes network planning impracticable, so only post-deployment strategies are feasible. A key FAP challenge is interference management and how best to dynamically allocate resources in an effective manner. In a joint macro-femtocell overlay arrangement, inter and intra-tier interference must be efficiently managed to ensure successful operation, with femto-to-femto (F2F) interference being the major issue, particularly in dense FAP scenarios. This talk presents an interference-aware paradigm for femtocells based on the novel concept of virtual clustering. An adaptive, scalable generalised virtual clustering femtocell (GVCF) architecture will be discussed which groups together FAP in logical clusters. With each cluster operating on different bands of frequencies, the corresponding cluster controller has only to manage its own FAP members, so system complexity is low. The GVCF model will be examined from both a resource availability and clustering perspective to minimise both cross-tier and F2F interference and achieve significantly enhanced quality-of-service (QoS) provision, especially at high FAP densities. The talk will also investigate the QoS implications of extending FAP coverage to reduce the number of F2M handovers when users move out of range, even for very short periods.

Short Bio:
Laurence S. Dooley received his B.Sc. (Hons), M.Sc. and Ph.D. degrees in Electrical and Electronic Engineering from the University of Wales/Cymru (Swansea) in 1981, 1983 and 1987 respectively. Having held professorial positions in both Australia and Germany, he was appointed in 2007, as Chair of Information and Communication Technologies in the Department of Computing and Communications at The Open University, Milton Keynes, where his main research interests include: next generation multimedia technologies, cognitive radio networks, green wireless communications, multimodal medical imaging, 3-D video inpainting, RGB-D descriptors in multi-sensory robot navigation, MANET and 4G/LTE security and SME technology transfer. He has co-edited one book and published more than 245 scientific peer-reviewed journals, book chapters, monographs and conference articles, with 4 papers being awarded international research prizes, including in June this year, the Best Paper Award at the IEEE Wireless Personal Multimedia Communications Symposium (WPMC'13) at the Global Wireless Summit held in Atlantic City. He also received the IEEE Certificate of Award in 2010 for Promoting International Exchange in recognition of his contributions, over two decades, to the biennial IEEE International Conference on Signal Processing series. He is a Chartered Engineer, Fellow of the British Computer Society, IEEE Senior Member and an Editorial Board member of the IET Image Processing journal as well as proudly, being Vice President of the Crawshays Rugby Union Club.

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