Network Cloudification: From SDN-NFV and 5G-MEC to Their Modeling and Optimization

Dr. Ying-Dar Lin

National Chiao Tung University (NCTU), Taiwan

Keynote Abstract— The second wave of cloud computing, named network cloudification, in the forms of SDN (Software Defined Networking), NFV (Network Function Virtualization), and 5G-MEC (Mobile Edge Computing), is to centralize and virtualize networking into data centers. It enables operators to offer NaaS (Networking as a Service) with much lower CAPEX and OPEX with larger flexibility because devices become simpler, the number of administrators is less, and service orchestration is easier. It turns parts of communications currently done in hardware into computing done in software. However, the host of these data centers would not be Google-like super data centers as they are too far away from subscribers. The latency requirement of 10ms and 1ms pushes the computing facilities down to CORD (central offices re-architected as data centers) and cellular base stations for SDN-NFV and 5G-MEC, respectively. In this talk, we first argue why, where and when SDN, NFV, 5G-MEC would prevail, and then illustrate how to make it happen with OpenFlow, SC (Service Chaining), NSH (Network Service header), etc. Then we examine how latency requirement dominates this virtualization game by listing key questions to answer in modeling and optimizing server resource allocation in the architectures of SDN, NFV, and 5G-MEC. Their answers are mostly unknown now but would benefit the architects and developers of OpenFlow switches, SDN controllers, SDN-NFV apps, NFV data centers, MEC-enabled base stations, and operator’s infrastructure in general.

Speaker Bio— YING-DAR LIN is a Distinguished Professor of Computer Science at National Chiao Tung University (NCTU) in Taiwan. He received his Ph.D. in Computer Science from UCLA in 1993. He served as the CEO of Telecom Technology Center in Taipei during 2010-2011 and a visiting scholar at Cisco Systems in San Jose during 2007–2008. Since 2002, he has been the founder and director of Network Benchmarking Lab (NBL,, which reviews network products with real traffic. NBL became a certified test lab of the Open Networking Foundation (ONF) since July 2014. He also cofounded L7 Networks Inc. in 2002, which was later acquired by D-Link Corp. His research interests include design, analysis, implementation, and benchmarking of network protocols and algorithms, quality of services, network security, deep packet inspection, wireless communications, embedded hardware/software co-design, and recently network cloudification. His work on “multi-hop cellular” was the first along this line, and has been cited over 750 times and standardized into IEEE 802.11s, IEEE 802.15.5, WiMAX IEEE 802.16j, and 3GPP LTE-Advanced. He is an IEEE Fellow (class of 2013), an IEEE Distinguished Lecturer (2014-2017), and a Research Associate of ONF. He has served or is serving on the editorial boards of IEEE Transactions on Computers, IEEE Computer (Associate Editor-in- Chief), IEEE Network, IEEE Communications Magazine - Network Testing Series, IEEE Wireless Communications, IEEE Communications Surveys and Tutorials, IEEE Communications Letters, Computer Communications, Computer Networks, Journal of Network and Computer Applications, and IEICE Transactions on Communications. He has guest-edited several Special Issues in IEEE journals and magazines, and co-chaired symposia at IEEE Globecom’13 and IEEE ICC’15. He published a textbook, Computer Networks: An Open Source Approach (, with Ren-Hung Hwang and Fred Baker (McGraw-Hill, 2011). It is the first text that interleaves open source implementation examples with protocol design descriptions to bridge the gap between design and implementation.

Performance Analysis of a MAC Protocol Consisting of EDCA on the CCH and a Reservation on the SCHs for the IEEE 802.11p/1609.4 WAVE

Dr. Bong Dae Choi

Korea University, Korea

Keynote Abstract— We propose an analytical model for the MAC protocol that consists of an enhanced distributed channel access (EDCA) on the control channel (CCH) and a reservation method on the service channels (SCHs) for the IEEE 802.11p/1609.4 wireless access in vehicular environments (WAVE) of intelligent transportation systems. Specifically, a safety packet of a high priority and a request for service (RFS) of a low priority for the SCH reservation are serviced on the CCH with a contention-based EDCA mechanism; meanwhile, non-safety applications such as map download and commercial advertisements are serviced on an SCH with a contention-free scheme through the reservation of an SCH from the handshaking of an RFS packet on the CCH.

To satisfy the safety packet QoS requirements regarding a within 100 ms delay and a successful delivery probability higher than 98%, we assume that each on-board unit of a vehicle is equipped with two transceivers, one of which always stays tuned on the CCH while the other is tuned on the assigned SCH; furthermore, a roadside unit sends an acknowledgement message to the broadcasted safety packets to guarantee a high successful delivery probability.

By constructing multi-dimensional Markov chains for the proposed MAC, we derive the intended successful delivery probability and the delay distribution of both the safety packet and the RFS packet. Numerical results show that the QoS requirements for the safety packet are satisfied, i.e., safety packets can be delivered within 100 ms with a successful delivery probability above 98%, even when the number of vehicles reaches up to 150. We compare the results of our proposed contention-free access scheme in the SCH selected by reservation with those of a contention-based access scheme in the SCH selected by randomness.

Speaker Bio— Bong Dae Choi is a Professor at Department of Mathematics and Research Institute for Information and Communication Technology, Korea University, Seoul, Korea. He received B.S. and M.S. in Mathematics from Kyungpook University, and received Ph.D. in Mathematics from Ohio State University, 1980.

He has worked as a professor at Kyungpook University (1972-1983), at KAIST (1983-1999), Korea University (1999-2012) and at Sungkyunkwan University (2012-2015), Korea. He was a director of Telecommunication Mathematics Research Center (2001-2012) at Korea University. He received best paper award from IEE in 2000 and he was awarded Academic award from Korean Mathematical Society (1997) and Seoul Culture Prize in Science in 2001. He is a fellow of Korea Academy of Science and Technology. He was an editor of Journal of Communications and Networks, and an associate editor of Queueing Systems, and is an associate editor of Telecommunication Systems.

His areas of interest include queueing theory and its applications to the communication systems. His recent interests are performance evaluation of IEEE 802.11, IEEE15.4, 15.4e,IEEE16e, power saving scheme, cognitive radio networks , IEEE 802.11p/1609.4 WAVE and Deep Learning. He has published about 120 papers in referred journals and 21 patents. His papers have appeared in Queueing Systems, Journal of Applied Probability, IEEE, IEE, IEICE, Performance Evaluation, Telecommunication Systems, Computer Networks and others.

Invited Papers

A Reliability-Based Trust Model for Efficient Collaborative Routing in Wireless Networks

Dr. Jairo Gutierrez

Associate Professor and Deputy Head of School of Engineering, Computer & Mathematical Sciences

Department of Information Technology and Software Engineering

Auckland University of Technology

Co-authors: Aminu Bello Usman

Functionalized Optical Fibre Sensors for Real-Time Environmental Monitoring Applications

Dr. Kin Kee Chow

Senior Lecturer

School of Engineering

Manchester Metropolitan University, United Kingdom