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


PhD Thesis Defence


"Power control in wireless ad hoc networks"

By

Mr. Jun Zhang


Abstract

Power control in mobile and wireless ad hoc networks has received
increasing research interest in recent years. The main idea of power
control is to transmit packets at the appropriate power levels that
guarantee their successful reception, with the objective of improving the
network throughput or lowering the energy consumed by the transmissions.

In this thesis, we focus on the study and design of power control
algorithms for IEEE 802.11-based wireless ad hoc networks to reduce energy
consumption per carried byte, without degrading the network throughput.

We first examine the routing layer point of view, and study the
relationship between the network throughput capacity and the transmission
range, which is determined by the transmission power setting. We notably
show that there cannot exist a universal power control algorithm to
improve the network performance without access to global network
information which is inappropriate in ad hoc networks.

We thus focus on the MAC layer point of view, where we study the
correlations that exist between the required transmission power of RTS,
CTS, DATA and ACK frames to guarantee a successful 4-way handshake and
propose novel power control algorithms that take such correlations into
consideration in order to reduce energy consumption per carried byte.


Date:			Monday, 11 June 2007

Time:			3:30p.m.-5:30p.m.

Venue:			Room 3501
			Lifts 25-26

Chairman:		Prof. In Choi (ECON)

Committee Members:	Prof. Brahim Bensaou (Supervisor)
			Prof. Gary Chan
			Prof. Jogesh Muppala
			Prof. Danny Tsang (ECE)
			Prof. Chun Tung Chou (Comp. Sci. & Engg.,
					      Univ. of NSW, Australia)


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