Maria Papadopouli <maria@cs.columbia.edu>
http://www.cs.columbia.edu/~maria

Performance of data dissemination among mobile devices

In this talk we present 7DS, a novel peer-to-peer data sharing system.
7DS is an architecture, a set of protocols and an implementation
enabling the exchange of data among peers that are not necessarily
connected to the Internet.
Peers can be either mobile or stationary.
It anticipates the information needs of users and fulfills them by searching 
for information among peers.
We evaluate via extensive simulations the effectiveness of our system for
data dissemination among mobile devices with a large number of user mobility 
scenarios.
We model several general data dissemination approaches and investigate the 
effect of the wireless coverage range, 7DS host density, and cooperation 
strategy among the mobile hosts as a function of time.
We also present a simple power conservation mechanism that is beneficial,
since it increases the power savings, without degrading the data dissemination.
Using theory from random walks, random environments and diffusion
of controlled processes, we model one of these data dissemination schemes 
and show that the analysis confirms the simulation results for this scheme.