Quality of Service Provisioning in Wireless Networks 
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Contact Hwee-Pink Tan [tanhp(at)tcd(dot)ie], Raphael Rom [rom(at)ee(dot)technion(dot)ac(dot)il] and Moshe Sidi [moshe(at)ee(dot)technion(dot)ac(dot)il]

Context
The importance of mobile connectivity along with the popularity of the Internet is fuelling the development and roll-out of Third Generation (3G) wireless systems and Wireless local area networks (WLAN). We envisage a demand for such a network to deliver wireless services from the wired network to the wireless users (downlink). Examples of such services include multimedia messaging, voice over WLAN and localized content distribution. In order to be meaningful, the data traffic associated with these services must be delivered at specific data rates and/or within specific delay, packet loss and jitter bounds. These requirements can be collectively termed Quality of Service (QoS). While the capacity of a wired link is usually assumed to be constant, the wireless link is characterized by high channel error rate, bursty and time-varying channel capacity and location dependent channel capacity. These characteristics make the provisioning of QoS in wireless networks a hard and challenging problem.

Overview
We develop a performance modeling and analysis framework that generates QoS metrics for a given wireless scheduler design, input flow and wireless channel specification. As such, the framework can be used to determine (a) the trade-offs amongst various QoS metrics for a particular scheduler design under a homogeneous scheduling scenario (b) the contribution of each component of the wireless scheduler to a particular QoS metric under a homogeneous scheduling scenario (c) the effects of channel heterogeneity on the wireless scheduler's performance (d) the effects of input heterogeneity on the wireless scheduler's performance.

Related Publications

  • Raphael Rom and Hwee-Pink Tan. Analysis of Performance Trade-offs for an Adaptive Channel-aware Wireless Scheduler. Accepted for publication in Springer Journal of Wireless Networks, December 2007.

  • Raphael Rom and Moshe Sidi and Hwee-Pink Tan. Design and Analysis of a Class-aware Recursive Loop Scheduler for Class-based Scheduling. Elsevier Journal of Performance Evaluation, vol 63, No 9-10, pp 839-863, October 2006.

  • Hwee-Pink Tan. Performance Analysis of Wireless Scheduling with ARQ over Fast Fading Channels. LNCS 3552, pp 353-355, (13th International Workshop on Quality of Service (IWQoS)), June 2005.

  • Hwee-Pink Tan, Raphael Rom and Moshe Sidi. QoS Provisioning in Wireless Networks . Ph.D. Research Thesis, Technion, Israel Institute of Technology, August 2004.

  • Raphael Rom and Hwee-Pink Tan. Framework for Delay Analysis of Wireless Schedulers. Proc. of the IEEE IPCCC, pp 153-157, April 2004.

  • Raphael Rom and Hwee-Pink Tan. Stochastic Analysis and Performance Evaluation of Wireless Schedulers. Wiley Journal of Wireless Communications and Mobile Computing Special Issue: Performance Evaluation of Wireless Networks, vol 4, No 1, pp 19-41, February 2004.

  • Raphael Rom and Hwee-Pink Tan. Performance Tradeoffs in Wireless Scheduling with Flow Aggregation. Proc. of the IEEE WCNC, vol 3, pp 1633-1638, March 2003.