Performance evaluation of a live, crowdsensing based transit feed service architecture
2014
Abstract—Taking public transportation is an efficient and
environmentally sound way of traveling in most of the cities.
Unfortunately, the static schedule information of the public
transport vehicles, available at the stops, on the web or in some
special format like GTFS (General Transit Feed Specification),
usually does not reflect the actual traffic situation. However, realtime
traffic updates require the gathering of an immense amount
of tracking data. Mobile crowdsensing, via the mobile devices
of the crowd, can offer a cheap and efficient way for collecting
such data. Nonetheless, for motivating active participation some
day zero service must be provided to the users. In this paper,
we discuss how to realize a live public transport information
service extending a static timetable based on GTFS data, as
the day zero service, using the power of the crowd for data
collection. We detail the design of such a service implemented by
an XMPP (Extensible Messaging and Presence Protocol) based
mobile crowdsensing architecture and evaluate its performance.
We show how we can build a scalable service architecture even
with commodity hardware to handle thousands of users.
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