Angela Sara Cacciapuoti, Francesco Calabrese, et al.
Ad Hoc Networks
In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicative of coordination calls, which occur just before face-to-face meetings. Their number is highly predictable based on the amount of calls between two users and the distance between their home locations - suggesting a new way to quantify the interplay between telecommunications and face-to-face interactions. © 2011 Calabrese et al.
Angela Sara Cacciapuoti, Francesco Calabrese, et al.
Ad Hoc Networks
Giusy Di Lorenzo, Marco Sbodio, et al.
IEEE TVCG
Arthur Trigueiro Baptista, Eric Bouillet, et al.
ITSC 2011
Bin Guo, Daqing Zhang, et al.
UbiComp 2011