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Title: Cross-Layer Data Aggregation in a Cognitive Radio Wireless Mesh Sensor Network
Presented by: Professor Chen-Khong Tham, National University of Singapore
Abstract: Backbone networks, such as wireless mesh networks, provide a more suitable topology for data aggregation compared to a flat topology. Nonetheless, the performance of a mesh topology may be adversely affected if the spectrum is overcrowded. Incorporating cognition can help relieve the issues caused by the scarcity of transmission opportunities by leveraging on dynamic spectrum access. Hence, a suitable data aggregation architecture for cognitive radio wireless mesh sensor networks (CR-WMSN) is required. In this talk, a framework for data aggregation in a CR-WMSN will be presented. We address the energy, transmission latency and data accuracy trade-offs by proposing a cross-layer optimization framework that controls the power, link access, routing and rate parameters such that the optimum balance between network lifetime and other quality of information (QoI) and quality of service (QoS) metrics are obtained. Our simulation and comparative results show that network lifetime and data accuracy can be controlled by adjusting the cross-layer parameters, and that the proposed cross layer scheme outperforms existing data aggregation schemes.
Biography: Chen-Khong Tham is an Associate Professor at the Department of Electrical and Computer Engineering (ECE) of the National University of Singapore (NUS). His current research focuses on sensor network infrastructures and real-time sensor data analytics involving cyber-physical systems, wireless sensor networks, mobile cloud computing and participatory sensing. He obtained his Ph.D. and M.A. degrees in Electrical and Information Sciences Engineering from the University of Cambridge, United Kingdom. From 2007-10, he was on secondment at the A*STAR Institute for Infocomm Research (I2R) Singapore. He is an associate editor of the IEEE Internet of Things Journal (IoT-J) and is in the editorial board of the International Journal of Network Management, and was the general chair of the IEEE SECON 2014, IEEE AINA 2011 and IEEE APSCC 2009 conferences. He is a member of the Technical Standards Advisory Committee (TSAC) convened by the Infocomm Development Authority (iDA) of Singapore.