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Information Aggregation

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The Ratio based algorithm selects the records to be aggregated blindly! ... Communication through Orinoco 802.11 wireless cards. ... – PowerPoint PPT presentation

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Title: Information Aggregation


1
TrafficView How Far Can You See?
Pravin Shankar, Mohammad Tanvir Alam, Nishkam
Ravi, Steve Smaldone, Shaila Musharoff and Liviu
Iftode
Department of Computer Science, Rutgers
University.
TrafficView Prototype
Overview
TrafficView System
HP Compaq laptops running TrafficView on top of
Windows as well as Linux. Positions are obtained
from eTrex GPS receivers connected to the
laptops. Communication through Orinoco 802.11
wireless cards. Communication ranges are extended
with omni-directional antennas.

System Architecture



Scalable Information Dissemination
TrafficView Demo
Information Aggregation


Problem

How to disseminate information about cars in
dynamic ad hoc networks of vehicles ?
Aggregate data to see vehicles as far as possible
with acceptable accuracy loss.

Solution


Aggregate data for vehicles that are close to
each other
3 cars on US highway 1 in New Jersey, right side
is the traffic information displayed in the last
car

Perform more aggregation as distance increases
Example of Traffic Information Displayed by
TrafficView

One movie that shows 4 cars running TrafficView
in a real-life traffic scenario.

Eliminate duplicates
In parallel, we show the information displayed by
Tra fficView at every Car.


For this demo, we emulate TrafficView using 4 HP
iPAQs (one for each car) and a laptop
We recorded the messages received at each car,
and each iPAQ re-plays one of these traces. The
messages are distributed, in order, to each iPAQ
from the laptop that stores all the traces.


http//www.cs.rutgers.edu/discolab/traffic
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