Analysis of a metropolitan-area wireless network
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Characterizing user behavior and network performance in a public wireless LAN
SIGMETRICS '02 Proceedings of the 2002 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
The changing usage of a mature campus-wide wireless network
Proceedings of the 10th annual international conference on Mobile computing and networking
User Mobility for Opportunistic Ad-Hoc Networking
WMCSA '04 Proceedings of the Sixth IEEE Workshop on Mobile Computing Systems and Applications
Social Serendipity: Mobilizing Social Software
IEEE Pervasive Computing
Access and mobility of wireless PDA users
ACM SIGMOBILE Mobile Computing and Communications Review
PeopleNet: engineering a wireless virtual social network
Proceedings of the 11th annual international conference on Mobile computing and networking
Analysis and implications of student contact patterns derived from campus schedules
Proceedings of the 12th annual international conference on Mobile computing and networking
Adaptive contact probing mechanisms for delay tolerant applications
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Aging rules: what does the past tell about the future in mobile ad-hoc networks?
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
Blue-Fi: enhancing Wi-Fi performance using bluetooth signals
Proceedings of the 7th international conference on Mobile systems, applications, and services
Opportunistic energy-efficient contact probing in delay-tolerant applications
IEEE/ACM Transactions on Networking (TON)
Findings from an empirical study of fine-grained human social contacts
WONS'09 Proceedings of the Sixth international conference on Wireless On-Demand Network Systems and Services
Trace-based mobility modeling for multi-hop wireless networks
Computer Communications
Taming the mobile data deluge with drop zones
IEEE/ACM Transactions on Networking (TON)
Plausible mobility inference from wireless contacts using optimization
Proceedings of the 8th ACM MobiCom workshop on Challenged networks
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The increasing sophistication of mobile devices has enabled several mobile social software applications, which are based on opportunistic exchange of data amongst devices in proximity of each other. Examples include Delay Tolerant Networking (DTN) and PeopleNet. In this context, understanding user interactions is essential to designing algorithms which are efficient and enhance the user experience. In our experiment, users were handed Bluetooth enabled phones and asked to carry 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 in this period. This paper analyzes this data by charactering the distributions of metrics such as contact time and inter-pair-contact time, and introducing several other important metrics useful for understanding user interactions. We find that most metrics follow a power law, except for inter-pair-contact time. We also look for patterns in user interactions, with the hope that these can be exploited for better algorithm design.