DATE: Thursday, June 23, 2005
TIME: 12:00 - 1:00 pm
PLACE: Wean Hall 8220

Eyal De Lara
University of Toronto

Accurate GSM-Based Indoor Localization

Accurate indoor localization has long been an objective of the ubiquitous computing research community, and numerous indoor localization solutions based on 802.11, Bluetooth, ultrasound and infrared technologies have been proposed. I will present the first accurate GSM indoor localization system that achieves median accuracy of 5 meters in large multi-floor buildings. The key idea that makes accurate GSM-based indoor localization possible is the use of wide signal-strength fingerprints. In addition to the 6-strongest cells traditionally used in the GSM standard, the wide fingerprint includes readings from additional cells that are strong enough to be detected, but too weak to be used for efficient communication. Experiments conducted on three multi-floor buildings show that our system achieves accuracy comparable to an 802.11-based implementation, and can accurately differentiate between floors in both wooden and steel-reinforced concrete structures.

Eyal de Lara received his Ph.D. and M.Sc. from Rice University in 2002 and 1999, and a B.Sc. from the Instituto Tecnologico de Monterrey in 1995. In 2002, he joined the Department of Computer Science at the University of Toronto as an Assistant Professor. His research interests include distributed systems, networking, and mobile and pervasive computing.

Host: M. Satyanarayanan

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