內容摘要：Recently, a new paradigm has emerged, named as Software Defined Vehicular Network (SDVN) which applies the concept of Software Defined Networking (SDN) into Vehicular Ad-hoc Networks (VANETs), to overcome the shortcomings in the current VANETs. With the introduction of the SDNs, the VANETs have been provided with flexibility and programmability along with a performance improvement. However, the improvement comes at a cost of a higher operational delay because the controllers are placed far away from the data plane in the existing SDVN architectures. As an alternative, we have proposed to bring the control plane down to Road Side Unit (RSU). In this study, we further extend this work and introduce a hierarchical distributed controller architecture where the top tier of controllers are regionally distributed on the Internet and the bottom tier of controllers are placed in several selected RSUs closer to vehicles so that the latency induced by the system becomes low. We further present a novel controller placement model for the RSU level controllers with the delay and the significance of the RSU location as the factors to achieve the optimization heuristically as an integer quadratic programming problem. In this talk, we show that our proposed controller placement model can optimize the placements of controllers with a lower latency compared to other possible controller placement methods including the existing SDVN architectures and conventional VANETs
個人簡介：Dr. Maode Ma, a Fellow of IET, received his Ph.D. degree in computer science from Hong Kong University of Science and Technology in 1999. Now, Dr. Ma is an Associate Professor in the School of Electrical and Electronic Engineering at Nanyang Technological University in Singapore. He has extensive research interests including network security and wireless networking. Dr. Ma has more than 360 international academic publications including over 170 journal papers and about 190 conference papers. He has delivered over 50 keynote speeches at various international conferences. He has served as conference chairs for over 100 international conferences. He currently serves as the Editor-in-Chief ofInternational Journal of Computer and Communication Engineering and International Journal of Electronic Transport. He also serves as a Senior Editor or an Associate Editor for other 5 international academic journals. Dr. Ma is a Senior Member of IEEE Communication Society and IEEE Education Society, and a Member of ACM. He is the Chair of the IEEE Education Society, Singapore Chapter and the Chair of the ACM, Singapore Chapter. He has served as an IEEE Communication Society Distinguished Lecturer from 2013-2016.