Ren Ping Liu, Dr., Professor of School of Computing and Communications, University of Technology Sydney

Markov chain is the main analytical tool for IEEE 802.11 modelling and analysis. However, existing 2-dimensional (2-D) Markov chain models of Wi-Fi systems are unable to capture the complete QoS performance and queueing behaviour due to the lack of an adequate finite buffer model. We propose a 3-dimensional (3-D) Markov chain that integrates the 802.11 system contention resolution and queueing processes into one model. The 3rd dimension, that models the queue length, allows us to accurately capture important QoS measures, delay and loss, plus throughput and queue length, for realistic 802.11 systems with finite buffer under finite load.

The Markov theory has since been extended and applied in other areas, leading to many research outcomes, including vehicular networks (VANET), WiFi localization, energy efficient design in the Internet of Things (IoT), and recently coexistence design and analysis of LTE in unlicensed spectrum under the LAA/5G framework.

Biography:

Ren Ping Liu is a Professor at the School of Computing and Communications in University of Technology Sydney, where he leads Network Security Lab in the Global Big Data Technologies Centre. Prior to that he was a Principal Scientist at CSIRO, where he led wireless networking research. He specialises in network design and modelling, and has delivered networking solutions to a number of government agencies and industry customers. Professor Liu was the winner of Australian Engineering Innovation Award and CSIRO Chairman's medal. Professor Liu has over 100 research publications, and has supervised over 30 PhD students. His research interests include 5G spectrum sharing, resource management, IoT energy efficient design, and network security.

Professor Liu is the founding chair of IEEE NSW VTS Chapter and a Senior Member of IEEE. He served as TPC chair for BodyNets2015, ISCIT2015, WPMC2014, as OC co-chair for VTC2017-Spring, BodyNets2014, ICUWB2013, ISCIT2012, SenSys2007, and in Technical Program Committee in a number of IEEE Conferences. Ren Ping Liu received his B.E.(Hon) and M.E. degrees from Beijing University of Posts and Telecommunications, China, and the Ph.D. degree from the University of Newcastle, Australia.