Mohsin Iftikhar
IEEE Circuits and Systems Society joint Chapter of the Vancouver/Victoria Sections

Prof. Mohsin Iftikhar
Computer Science Department
King Saud University

Title: Utilization of Novel Hybrid Polling Mechanisms in Modern 4G Wireless Networks

Monday, August 25, 2014, 11:00 am to 12:30 pm
ASB 9705, Applied Science Building, Simon Fraser University, Burnaby, BC, Canada

Light refreshments will be served.
The event is open to public.
We would greatly appreciate if you would please register so that we may more accurately estimate the room size and refreshments.
Maps: SFU


The polling model resembles with a system of multiple queues targeted by the single server in cyclic order. Polling models can be classified as Exhaustive, Gated and Limited Service. Polling models have an effective impact over performance investigation of network related applications.

In terms of providing guaranteed QoS to the end-user of multiservice internet, a variety of scheduling schemes have been introduced in the market such as Priority, Round-Robin, Weighted Fair Queuing (WFQ), Class Based Weighted Fair Queuing (CBWFQ) and Low Latency Queuing (LLQ) etc. All these schemes somehow represent some sort of polling mechanism in which a single server serves multiple queues in a cyclic fashion according to a specific scheduling logic. To date, the researchers have been analyzing the polling models and scheduling schemes separately. Also the polling models have been extensively studied and analyzed only with Poisson traffic distributions. On the contrary, it has been convincingly demonstrated through high quality studies over the past two decades that network traffic is self-similar and cannot be modeled through simple Poisson distribution.

This study brings novelty in the area of polling models through analyzing different kinds of polling schemes (exhaustive, gated and combination of these) with realistic traffic distributions i.e. self-similar and long range dependent. Also in our recent work, we have found that the combination of traditional polling schemes with common scheduling schemes can offer a more promising differential treatment in terms of providing the required QoS to different kinds of applications found in modern 4G wireless networks.

We have built an analytical framework by considering multiple classes of traffic that exhibit long range dependence and self-similar characteristics. The analytical framework is based on G/M/1 queuing system, which has been analyzed under a variety of polling mechanisms like exhaustive service, gated service and combination of them. Also we have combined different sorts of polling mechanism with a variety of common scheduling schemes. We have built the Markov chain for G/M/1 queuing system and extracted closed-form expressions for different QoS parameters such as delay and packet loss rate. We also performed simulation experiments in C++ to validate our proposed analytical framework for evaluating the QoS parameters.


Mohsin Iftikhar received his B.Sc. Electrical Engineering from University of Engineering and Technology Lahore, Pakistan, M.Eng.Sc. in Telecommunications from UNSW Australia and PhD from University of Sydney, Australia in 1999, 2001 and 2008 respectively. He had been the Consultant for National Information, Communication and Technology Australia (NICTA) and Soul Communications Australia during 2007-2009. Further, he used to train Ericsson Australia employees on different Cisco networking products. Currently he is working as an Associate Professor in Computer Science department, King Saud University, ( Riyadh, Saudi Arabia. He had been also affiliated with NICTA ( as Visiting Research Fellow and as an Honorary Research Associate with School of IT, University of Sydney ( ). He has published several high quality papers in international conferences and journals. He has been the first person to produce closed form expressions for G/M/1 queuing system for multiple classes of self-similar traffic under variety of scheduling mechanisms. His work has been acknowledged both my academia and industry and has been awarded different industrial and academic prizes/awards. The most prominent ones are (Siemens Prize for solving an industry problem 2006, Networks and Systems Prize in research project work, school of IT, 2007). His PhD thesis was nominated for Core Dissertation award in University of Sydney in 2008. He has been awarded an Endeavour Postgraduate Fellowship by Australian Government in 2008. He has won many competitive grants of being worth 5 Million SR in recent years. Further, he has been nominated for inclusion in "Who is Who in the World" in 2010, 2011 and 2012, 2014 editions. He is the technical reviewer of many international conferences and high quality ISI journals. He has served in TPC of many international conferences. He has been the TPC co-chair for 9th IEEE joint international conference of computer science and software engineering (Bangkok, Thailand) in 2012. His research interests include Quality of Service (QoS), Traffic Modeling, Polling Models, 3G/4G Networks, Markov Chains, Stochastic Processes, Network Calculus, Sensor Networks and Wireless Body Area Network (WBAN). He is the member of IEEE, ACM, IET and PMI.

Last updated
Thu Aug 14 16:00:27 PDT 2014.