Reality vs emulation: running real mobility traces on a mobile wireless testbed

Authors:
Youngil Kim;Keith Taylor;Carson Dunbar;Brenton Walker;Padma Mundur
Affiliations:
University of Maryland, College Park, MD, USA;University of Maryland, College Park, MD, USA;University of Maryland, College Park, MD, USA;Laboratory for Telecommunications Sciences, College Park, MD, USA;University of Maryland, College Park, MD, USA
Venue:
HotPlanet '11 Proceedings of the 3rd ACM international workshop on MobiArch
Year:
2011

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Abstract

Laboratory-based mobile wireless testbeds such as MeshTest and the CMU Wireless Emulator are powerful platforms that allow users to perform controlled, repeatable, mobile wireless experiments in the lab. Unfortunately such systems can only accommodate 10-15 nodes in an experiment. We have designed and built a scalable wireless testbed that uses software virtualization and live migration to facilitate experiments involving intermittently connected networks with many multiples of the number of physical nodes available on such a testbed. In this paper, we share our experience with using real traces from the DieselNet/DOME project on our testbed. While this trace provide GPS coordinates for where the contact occurs, we needed to deduce the overall mobility from using GPS logs for individual buses. Replicating the bus mobility on our testbed we recreate contact events and compare those to DOME traces. We also survey other traces we can use on VMT and evaluate how challenging they would be to run on the system.