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Next week's (Wednesday 19/12) COSC SEMINAR

TITLE:   A MAC protocol for multimedia wireless networks

SPEAKER:  Enoch Kao
	  MSc student  of Department of Computer Science
	  University of Canterbury

VENUE: Room 031 Cosc / Math / Stats building - University of Canterbury
DATE: Wednesday , December 19, 2001
TIME: 10:00 to 10:50, followed by questions, coffee/tea & good quality
nibbles

ABSTRACT:Medium Access Control (MAC) plays a vital role in wireless
networks. 
With the increasing demand for multimedia services, MAC protocols of
wireless
networks are required to satisfy a variety of Quality of Service (QoS)
requirements, including short delays. One of techniques for satisfying
such
requirements is to assign transmission rights on demand. Following such
a 
protocol, bandwidth is assigned mobile terminals  when they have
something 
to transmit. The base station has absolute control of the bandwidth,
including 
assignment of different priorities to different classes of users. In
this thesis, 
we survey recently proposed MAC protocols for wireless networks.

The survey includes MAC protocols designed for different network
generations and
topologies. Next, we focus on the demand part of demand assignment MAC
protocols.
We propose a new strategy based on probabilistic assignment that allows
mobile 
terminals to pick the best time for transmitting their demands. Building
upon 
this concept, wepropose a new protocol called Transmission Probability
Based
Dynamic Slot Assignment(TRAPDYS). It is designed to add to the existing
demand 
assignment protocols. The TRAPDYS protocol introduces a flexible
prioritised 
access by dynamically adjustingtransmission
rights to network traffic activities. We analyse the performance and
behaviour
of the TRAPDYS protocol by applying stochastic simulation. The results
show that 
the TRAPDYS protocol is able to cope witha high level of traffic by
utilizing 
temporarily unused network resources and improves the utilization of the
demand 
part of network capacity used by a given demand assignment MAC protocol.
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This message is forwarded to members of the COSC/EEE/Management research 
group on networks at the University of Canterbury, Christchurch, 
New zealand, and anybody else interested in research in this area

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		Associate Professor Dr Krzysztof Pawlikowski

	Department of Computer Science,  University of Canterbury
 			Christchurch, New Zealand
		
ph.  +(64) 3 3642 987 ext.7772  email:   krys@cosc.canterbury.ac.nz 
fax. +(64) 3 3642 569      URL:     http://www.cosc.canterbury.ac.nz/~krys

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