X. Wu, K.N. Brown, C.J. Sreenan.
Analysis of Smartphone User Mobility Traces for Opportunistic
Data Collection in Wireless Sensor Networks.
Elsevier Journal on Pervasive
and Mobile Computing, accepted for publication July 2013.

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The increasing ubiquity of smartphones coupled with the mobility of their
users will allow the use of smartphones to enhance the operation of wireless
sensor networks. In addition to accessing data from a wireless sensor network
for personal use, and the generation of data through participatory sensing,
we propose the use of smartphones to collect data from sensor nodes op-
portunistically. For this to be feasible, the mobility patterns of smartphone
users must support opportunistic use. We analyze the dataset from the Nokia
Mobile Data Challenge, and we identify the significant patterns, including
strong spatial and temporal locality. These patterns should be exploited
when designing protocols and algorithms, and their existence supports the
proposal for opportunistic data collection.