CIS Department Talk - May 31, 2007
The Department of Computer and Information Science & The Society of
Computer Science Present
Speaker: | Ellen Xiaolan Zhang, University of Massachusetts
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Topic: | Disruption Tolerant Networks: Performance and Mobility Trace Modling
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Date: | May 31, 2007 at 11:00am |
Place: | John Mulcahy Hall, Room 138 |
Abstract:
Disruption Tolerant Networks, where there is often no contemporaneous path from
source node to destination node, present challenging networking scenarios. Routing
in such networks has adopted so called "store-carry-forward" paradigm, examples
include epidemic routing and its variations.
In this talk, I will first present a rigorous, unified framework based on Ordinary
Differential Equations (OEDs) for studying performance of epidemic routing and its
variations. Derived as limits of Markovian models under a natural scaling, the
OEDs models yield closed-form expressions for several performance metrics, and a
numerical solution complexity that does not increase with the number of nodes.
Then I will present a modeling study of mobility traces taken from UMassDieselNet,
an operational bus-based DTN. I propose a rout-level model that captures the
structures within the bus-to-bus contact process, and show that epidemic routing
performance predicted by traces generated with this model are much closer to the
actual performance that would be realized in the operational system aggregated
model. This suggest that one must take care in choosing the right level of model
granularity when modeling mobility-related measuring such as inter-contact times
in DTN networks.
Last, I will Briefly describe other research works I have done in the areas of
DTNs, and research I did in the area of multimedia streaming and VoIP network
measurement.
Bio:
Ellen Xiaolan Zhang received her MSc Degree in computer science from University
of Massachusetts, Amherst in 2001 Her BA degree in computer science from Peking
University, China in 1992. She is currently a Ph.D. candidate at the Computer
Science Department at University of Massachusetts, Amherst. She has six years of
industrial working experience, and has done her summer internship with Bell Labs,
Alcatel-Lucent in 2004. Her research interests include wireless mobile networks,
Delay Tolerant Networks, multimedia communication, the measurement, modeling and
performance evaluation of computer system and network.
For more information, contact:
Ms. Diane Roche (718) 817-4480; (roche@cis.fordham.edu)
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