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

Wireless Sensor Networks Mobility Management: A Performance Control Approach

Speaker: Mr. Zinon Zinonos
Affiliation: University of Cyprus, Cyprus
Category: PhD Defense
Location: Room 148, Faculty of Pure and Applied Sciences (FST-01), 1 University Avenue, 2109 Nicosia, Cyprus (directions)
Date: Monday, July 15, 2013
Time: 09:30-10:30 EET
Host: Vasos Vassiliou (

The growth of wireless sensor networks utilization has generated research attention in systems that need to provide certain performance assurances. Nowadays, there is also an increased interest from industrial operations to use sensor networks, due to the low deployment and maintenance cost that they can provide. A number of sensor network applications are envisioned to be applied to industry settings where the existence of mobile nodes (MN) is required. In critical applications, the real-time monitoring of a MN must always be available, something that requires the existence of a suitable mobility protocol to control the handoff procedure. In this work, we aim to create a mobility management protocol that can be applied in critical applications and which will efficiently maintain the connectivity of the mobile node by controlling the handoff procedure (triggering and execution). The first practical step of this work was to propose a radio propagation model based on an industrial setting with the goal to incorporate it into the scope of relevant simulators. Our first mobility management approach was based on the use of single-metric based handoff triggering solutions. Thus, we implemented and evaluated solutions, which include the use of metrics like the RSSI, Link Loss, Burst Loss, the Simple Moving Average of the RSSI, and the Link Loss and the Estimated Weighted Moving Average of RSSI and Link Loss. Our second approach was to use fuzzy logic control principles to design a simple, effective, and efficient non-linear control law, in order to provide a system that will manage to control the handoff triggering procedure and provide improved performance. We proposed the FMLC solution, which is shown to outperform all other solutions. Regarding the handoff decision/execution phase, we used three different options. The first option was the use of the RSSI with hysteresis margin, the second option was our proposed Burst Loss Algorithm (BLA) using multiple attachment points and the third option was a combination of the two aforementioned options. Finally, we proposed a new network-based mobility model able to provide mobility support in 6LoWPAN networks. This model includes the proposal of the mobility signalling, the packet format and the operation of the MN. Analytical evaluation of our proposal comparison with other solutions is provided. The applicability of the proposed solutions were established in both an oil refinery industry setting where performance is critical and the COOJA simulator, which was modified to match the refinery testbed behaviour.

Short Bio:
Zinon Zinonos is a PhD Candidate at the Department of Computer Science, of University of Cyprus under the supervision of Dr. Vasos Vassiliou. He completed his undergraduate studies at CEID (Computer Engineering and Informatics Department, University of Patras) in 2005 and his MSc studies at the Department of Computer Science at the University of Cyprus in 2007 (GPA 8.5/10-second department award). His research interests include Sensor Networks, Mobile Networks (MIPv4, MIPv6, Ad Hoc), Wireless Communications (3G/4G cellular wireless networks) and Quality of Service (QoS in IPv6 networks).

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