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


PhD Thesis Defence


"Resource Management in Wireless Networks"

By

Miss Jihui Zhang


Abstract

Resource management is of great importance in wireless networks, as it can
improve the scarce wireless spectrum usage, enhance the network capacity,
and help to provide QoS support for various services. In this thesis, we
study resource management in both CDMA cellular networks and wireless
ad-hoc networks.

In cellular system, we look at two issues. One is the downlink admission
control, which provides QoS to multiple service classes. We quantitatively
demonstrated the significant impact from a set of statistical factors and
design an admission strategy to guarantee a long-term transmission
quality. The second is using adaptive cell sectoring for non-uniform
traffic to minimize the total transmission power in a CDMA cellular
network. We presented dynamic programming based optimal formulation as
well as an effective sub-optimal approach, namely the cluster-based
sectoring algorithm, to solve the problem.

In the ad-hoc system, we have studied several aspects in resource
management, in particular the throughput capacity and energy consumption,
and investigated two major problems so far. The first one is the mobility
assisted routing in a mobile ad-hoc network (MANET). We explored node
mobility in the search for packet delivery routes, which optimized a
variety of QoS criteria, under a deterministic mobility model operating in
both interference-free and interference-limited regimes. The most recent
work focuses on joint optimization in a multi-channel multi-radio network,
with the objective of minimizing the overall system activation time for a
given traffic load. We developed mathematical formulation to the
optimization, and proposed an efficient column generation based approach
to solve, which achieves very close upper and lower bounds to the problem.
Lastly, we discuss our future work in wireless mesh networks. Seeking
efficient resource management strategies, which comply with the specific
demands of this emerging area, would be the main focus of our study.


Date:			Tuesday, 16 August 2005

Time:			3:00p.m.-5:00p.m.

Venue:			Room 1504
			Lifts 25-26

Chairman:		Prof. Iam Keong Sou (PHYS)

Committee Members:	Prof. Bo Li (Supervisor)
                  	Prof. Yunhao Liu
                        Prof. Lionel Ni
                        Prof. Bing Zeng (ELEC)
                        Prof. Jason Y.B. Lin (Comp. Sci. & Info. Engr.,
					      National Chiao Tung Univ.)



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