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First ACM SIGMOBILE International Workshop on
Mobility Models for Networking Research

Colocated with ACM SIGMOBILE MobiHoc'08

Hong Kong
27 May 2008

Workshop Program

9.00 - 10.00 Opening Remarks and Keynote Speech

Prof. Mehul Motani, National University of Singapore

Title: Understanding User Interactions in Real and Virtual Worlds

Abstract: The increased capability of mobile devices has facilitated the emergence of mobile social software applications which rely on opportunistic exchange of information between users who encounter each other in the real world.  This kind of mobile social networking is also prevalent in virtual worlds such as Second Life from Linden Lab (e.g., users spent 28 million hours in Second Life in January 2008 alone!). In both these scenarios, understanding how users behave and interact is key to building better applications and systems. We will describe the experiments we conducted in both the real and virtual worlds to understand user behavior and dynamics.  We will also discuss what we have learned from analyzing this data and how we might use these lessons to design more efficient systems and algorithms.

In the real world, we asked users to carry Bluetooth enabled phones with them all the time to log information about other devices in their proximity. Data was logged over several months, with over 350,000 contacts logged and over 10,000 unique devices discovered. We will briefly show how our findings lead to algorithms for operating mobile devices in a more energy efficient manner.

In the virtual world, we collected mobility traces from over 84,000 avatars spanning 22 regions over two months in Second Life.  We analyzed the traces to characterize the dynamics of avatar mobility and behavior, both temporally and spatially.  Our findings from the traces have implications on the design of peer-to-peer networked virtual environments, server load balancing and zone partitioning, and mobility modeling of avatars.  We will briefly show how these findings lead to the design of a better proxy caching algorithm.

Biography: Mehul Motani received the B.S. degree from Cooper Union, the M.S. degree from Syracuse University and the Ph.D. degree from Cornell University, all in Electrical and Computer Engineering.  He is currently an Assistant Professor in the Electrical and Computer Engineering
Department at the National University of Singapore. His research interests are broadly in the area of wireless networks and systems. He also works on research problems which sit at the boundary of information theory, networking and communications.  He has also been a member of technical staff at the Institute for Infocomm Research in Singapore for three years and a member of technical staff at Lockheed Martin in Syracuse, New York for over four years.

Dr. Motani was awarded the Intel Foundation Fellowship for work related to his Ph.D. in 2000, won the Telecom Italia Mobile prize at SIMAGINE in 2003, and advanced to the semifinals of Startup@Singapore in 2005.  He has served on the organizing committees of ISIT and ICCS and the technical program committees of MobiCom, InfoCom, SECON and several other conferences. He participates actively in IEEE and ACM and has served as the secretary of the IEEE Information Theory Society Board of Governors.

10.00-10.30  Coffee Break

10.30-12.00 First Session: Mathematical Models of Human Mobility
On Clustering Phenomenon in Partitioned Mobile Networks
Michal Piorkowski (EPFL, CH); Natasa Sarafijanovic-Djukic (EPFL, CH); Matthias Grossglauser (Nokia Research Center/EPFL, CH)

Density Estimation for Out-of-Range Events on Personal Mobile Devices
Arjan Peddemors (Telematica Instituut, NL); Henk Eertink (Telematica Instituut, NL); Ignas Niemegeers (Delft University of Technology, NL)

Infection Spread in Mobile Networks with Random and Adversarial Node Mobilities
Yi Wang (University of Southern California, US); Shyam Kapadia (University of Southern California, US); Bhaskar Krishnamachari (University of Southern California, US)

12.00-2.00 Lunch Break

2.00-3.00 Second Session: Human Networks and Mobility Models

Routing Performance Analysis in Human-Driven Delay Tolerant Networks
Seongik Hong (North Carolina State University, US); Injong Rhee (North Carolina State University, US); Seong Joon Kim (North Carolina State University, US); Kyunghan Lee (Korea Advanced Institute of Science and Technology (KAIST), KR); Song Chong (Korea Advanced Institute of Science and Technology (KAIST), KR)

Working Day Movement Model
Frans Ekman (Helsinki University of Technology, FI); Ari Keränen (Helsinki University of Technology, FI); Jouni Karvo (Helsinki University of Technology, FI); Joerg Ott (Helsinki University of Technology, FI)

3.00-3.30 Coffee Break

3.30-4.30 Third Session: Mobility Models for Vehicular Networking

On the Need for Bidirectional Coupling of Road Traffic Microsimulation and Network Simulation
Christoph Sommer (University of Erlangen, DE); Zheng Yao (University of Erlangen, DE); Reinhard German (Universitaet Erlangen-Nuernberg, DE); Falko Dressler (University of Erlangen, DE)

Generic Mobility Simulation Framework (GMSF)
Rainer Baumann (ETH Zurich, CH); Franck Legendre (ETH Zürich, CH); Philipp Sommer (ETH Zurich, CH)

4.30 Closing Remarks