1. UNIVERSITY OF JYVÄSKYLÄ Mobile Encounter Networks and Their Applications 1 st IEEE International Peer-to-Peer for Handheld Devices Workshop IEEE CCNC, Las Vegas, 12 th of January 2007 Niko Kotilainen, research student, niko.kotilainen@jyu.fi With co-authors Oleksiy Volovikov, Timo Juonoja, Matthieu Weber, Mikko Vapa and Jarkko Vuori Department of Mathematical Information Technology University of Jyväskylä, Finland www.mit.jyu.fi/cheesefactory

2. UNIVERSITY OF JYVÄSKYLÄ Mobile Encounter Networks Very sparsely connected P2P networks No multi-hop capabilities Emerge when mobile devices come across each other and communicate Single information exchanges result in a diffusion of information Users physically carry information to other devices

3. UNIVERSITY OF JYVÄSKYLÄ Information Diffusion R1 R2 R1 R2 R1 R2 R2 R1 R1 R2

4. UNIVERSITY OF JYVÄSKYLÄ Advantages and Disadvantages Scalable Robust No need for infrastructure Free communication medium No real-time querying because of the push type of the network Power consumption even when not actively using the applications

5. UNIVERSITY OF JYVÄSKYLÄ BlueCheese Prototype mobile encounter network middleware Provides applications a simple API for exchanging information with other devices running the same app Programmed in C++ and runs on Symbian S60 devices App 2Application 1 BlueCheese Bluetooth (RFCOMM, L2CAP, SDP) Other BlueCheese Devices

6. UNIVERSITY OF JYVÄSKYLÄ BlueCheese Measurement Results (1/3) Bluetooth device discovery time

7. UNIVERSITY OF JYVÄSKYLÄ BlueCheese Measurement Results (2/3) Bluetooth connection establishment time

8. UNIVERSITY OF JYVÄSKYLÄ BlueCheese Measurement Results (3/3) Power consumption ratios

9. UNIVERSITY OF JYVÄSKYLÄ Applications: Gasoline Price Comparison System Collects gasoline price information when a user fuels his car Price data is diffused to the network Enables users to compare the prices from several gas stations nearby Prototype built on top of BlueCheese

10. UNIVERSITY OF JYVÄSKYLÄ Other Application Ideas Other price comparison services Joke Service Event Service Newspaper Service

11. UNIVERSITY OF JYVÄSKYLÄ Conclusions and Future Work Mobile Encounter Networks… –…are not suitable for all applications –…provide clear benefits in some applications Future work idea: Mobility Assisted Routing

12. UNIVERSITY OF JYVÄSKYLÄ