Seminar Abstract
This talk covers two parts, energy efficient cooperative MAC in wireless sensors networks and aggregated packet transmission in duty cycle WSNs. Part I: CDC-MAC is cooperative MAC protocol jointly proposed by GATECH and UiA which utilizes cooperation communications to mitigate the effect of energy hole in WSNs. However, node synchronization is needed for every packet transmission in CDC-MAC. By considering periodic traffic, we further extend CDC-MAC by proposing energy efficient CDC-MAC, referred to as EECDC-MAC, which requires node synchronization only in the network initialization phase. Numerical results illustrate that longer network lifetime is achieved using EECDC-MAC. Part II: packet transmission in WSNs is traditionally performed on a per-packet basis during each duty cycle. In this work, we propose to transmit a batch of packets for each transmission by aggregating several packets together at each node. A Markov model is developed to analyze the performance of our proposed scheme. Numerical results demonstrate that higher throughput and lower delay are achieved with lower per-bit energy consumption by employing the aggregated transmission scheme.

Speaker's Biosketch
Frank Y. Li holds a Ph.D. degree from the Norwegian University of Science and Technology (NTNU). He joins the Department of Information and Communication Technology, University of Agder (UiA) in August 2007 where he is currently a Professor. During the past few years, he has been an active participant in several Norwegian and EU FP6/FP7 research projects. He is listed as a Lead Scientist by the European Commission DG RTD Unit A.03 - Evaluation and Monitoring of Programmes in Nov. 2007.  Dr. Li is a Sensor Member of the IEEE. His research interests include 3G/4G and beyond mobile systems and wireless networks, mesh and ad hoc networks; wireless sensor network; cooperative communications; cognitive radio networks; green wireless communications; QoS, resource management and traffic engineering in wired and wireless IP-based networks; analysis, simulation and performance evaluation of communication protocols and networks.