Traffic Exceeds Wireless Capacity - Solution Approaches for Sustainable Networks
Dr Rainer Schoenen (Department of systems and computer engineering, Carleton University, Ottawa, Canada)
APPLIED SIGNAL PROCESSING SERIESDATE: 2011-11-17
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
Data traffic is expected to grow faster than wireless cellular capacity, so a congestion situation is unavoidable in the future. PHY- and MAC-layer improvements for LTE-Advanced and beyond promise large gains, but still will not be able to satisfy the future demand. The capacity imbalance between wired and wireless links imposes a bottleneck on the wireless link. The dynamics of a wireless channel and the variations in the higher priority real time traffic both make full link utilization and reasonable capacity sharing impossible. This presentation addresses the supply-demand imbalance by prospective mechanisms different from the usual oversizing approach. User-in-the-loop is a concept which increases spectral efficiency readily, but in the long term gains even more by training the user to a traffic-aware behavior. A closed loop credit based flow control comes into action when best effort traffic fills up all available capacity and packet losses must be avoided. A QoS-aware usage-based traffic tariff will also train the user and fits into the user-in-the-loop approach. Models of control theory and stochastic Petri nets (SPN) are used and the cross-layer aspect is emphasized.
BIO:
Dr. Rainer Schoenen received his B.Sc., M.Sc. and Ph.D. degrees from Germany in Electrical Engineering in 1995 and 2000, respectively. His research interests include stochastic Petri nets and queuing systems, ATM, TCP/IP, switching, flow control, QoS, tariffs, User-in-the-loop, wireless resource and packet scheduling and the MAC layer of 4G systems. In particular, his PhD thesis was on aSystem Components for Broadband Universal Networks with QoS Guaranteea with the ISS group of Professor Meyr at RWTH Aachen University, Germany, from 1995-2000. Dr. Schoenen was a senior researcher/lecturer at Communication Networks (ComNets) Research Group, RWTH Aachen with Professor Walke from 2005 to 2009, teaching topics on computer networks, queuing theory and networks, Petri nets, channel coding, OS kernel management while performing research on LTE-Advanced, FDD relaying, scheduling, OSI layer 2 (MAC) and IMT-Advanced Evaluation within WINNER+. He has been a visiting PDF and later a research associate and industry project manager at the Department of Systems and Computer Engineering, Carleton University, Ottawa, Canada, from January 2010 and January 2011, respectively. working with Professor Halim Yanikomeroglu.
