  Crowdsourcing enables the fine-grained characterization and performance
evaluation of today's large-scale networks using the power of the masses and
distributed intelligence. This paper presents SmartProbe, a system that
assesses the bottleneck capacity of Internet paths using smartphones, from a
mobile crowdsourcing perspective. With SmartProbe measurement activities are
more bandwidth efficient compared to similar systems, and a larger number of
users can be supported. An application based on SmartProbe is also presented:
georeferenced measurements are mapped and used to compare the performance of
mobile broadband operators in wide areas. Results from one year of operation
are included.
