The Hong Kong University of Science and Technology
Department of Computer Science

MPhil Thesis Defence

"Channel allocation with QoS guarantee in mobile wireless networks:
 single and multiple types of traffic"

By

Miss Li Yin

Abstract

The mobile communication systems has evolved remarkably since its first deployment. The tremendous growth in the mobile subscribers and the introduction of new services in the next generation of wireless networks has posed challenging problems in providing quality-of-service support for various of applications. In this thesis research, we first proposed an efficient adaptive call admission control scheme which can guarantee the QoS requirement without any prior knowledge of traffic parameters and signaling overhead. The novelty of this scheme lies in its dynamically obtaining traffic parameters and status information through local on-line estimation.  Simulations results demonstrate the good system performance of this on-line estimation algorithm under different system setup.  The simplicity and efficiency of this scheme makes it possible to be put into actual deployment.

Another scheme proposed is a dual-threshold reservation scheme (DTR) for integrated voice/data wireless network. The next generation of mobile networks are expected to carry multimedia traffic. The bandwidth allocation and management is of great importance due to the spectrum limitation. The DTR is proposed to provide effective bandwidth management while satisfying the QoS requirement in terms of voice handoff dropping probability, voice blocking probability and data loss probability. Analytical model based on this scheme is developed. In addition, for the DTR model, the selection of optimal thresholds is of great importance to maximize the spectrum utilization while guaranteeing the QoS requirements. Based on the observation of the relationship between thresholds and system performance, we propose hypotheses to reduce the high computational complexity in finding the optimal thresholds.


Date:			Wednesday, 20 December 2000

Time:			2:30p.m.-4:30p.m.
	
Venue:			Room 1505
			Lifts 25-26

Chairman:		Dr. Jogesh Muppala

Committee Members:	Dr. Bo Li (Supervisor)
			Dr. Man-Hoi Choy
			Dr. Jelena Misic


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