A Measurement-Based Call Admission Control Strategy for VoIP in the
DiffServ Environment
John
Daigle
University of Mississippi
Date:
Friday, November 3, 11am
Location: BA 2165 (Bahen Center)
Abstract:
We propose and analyze a simple measurement-based call admission
control procedure for carrying VoIP in a DiffServ environment. We
assume voice sources are leaky-bucket controlled with known
leaky-bucket parameters. We analyze the leaky bucket to derive the
distribution of the time over which voice sources generate traffic at
peak rate. We then use the results of that analysis, which provides
complete knowledge of the traffic generation characteristics of a
single source, to derive a Markov chain model that characterizes the
voice packet generation process of a single voice source. We then
derive a simple stateless threshold policy for admission control. We
then show, via simulation, that the QoS achieved using the
threshold-based CAC policy is very close to that achieve by a
stateful admission control policy even at very high traffic
utilization.
Bio:
John
N. Daigle is Director, Center for Wireless Communications, and
Professor of Electrical Engineering at the University of Mississippi,
Oxford. He received a doctorate from Columbia University in operations
research. Prof. Daigle is a Fellow of the IEEE. He has served as
Editor-in-Chief of IEEE Network and IEEE Communication Surveys and
Tutorials, and was formerly an Editor for IEEE/ACM Transactions on
Networking and an Associate Editor of Operations Research. He was
formerly Director of Education of the IEEE Communications Society and
has previously served on that society's Board of Governors. He is a
past chairman of the Society's Technical Committee on Computer
Communications, and he has served on the technical program committees
of numerous IEEE conferences and workshops. Prof. Daigle has received
the 2004 TCCC Outstanding Service Award form the IEEE Communication
Society's Technical Committee on Computer Communications.