PhD Qualifying Examination


"A survey on Power Control in Wireless Ad Hoc Networks"

Mr. Junhua ZHU


Abstract:

Transmission power control in wireless ad hoc networks is concerned with
the selection of transmit power for packet transmission at each node to
achieve some desired performance targets. The transmit power level affects
many aspects of the operation of wireless network: it impacts the physical
layer by determining the signal quality; it impacts the MAC layer by
determining the contention region or interference at each receiver; it
impacts the network layer by determining the set of candidate nodes for
next hop; and finally it impacts the transport layer by determining the
congestion level of the wireless medium. Therefore, transmission power
control problem is a prototypical example of cross-layer design problems
in wireless ad hoc networks. It is also a key factor to several
performance metrics such as throughput, delay and energy consumption.

In this survey, we first distill some basic principles that guide the
design of power control algorithms and protocols, and then summarize a
number of power control algorithms and protocols from the literature. We
classify them by their impacts on the layers of the protocol stack. First
we investigate power control problems considering only one layer, and then
review the design of power control algorithms in a holistic approach.
Finally, energy-oriented power control problem is investigated from the
performance perspective. Open issues are finally discussed.


Date:     		Thursday, 19 January 2006

Time:                   2:00p.m.-4:00p.m.

Venue:                  Room 2503
			lifts 25-26

Committee Members:      Dr. Brahim Bensaou (Supervisor)
			Dr. Gary Chan (Chairperson)
			Prof. Mounir Hamdi
			Dr. Danny Tsang (ELEC)


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