2001 Reports

Effects of power conservation, wireless coverage and cooperation on data dissemination among mobile devices

Papadopouli, Maria; Schulzrinne, Henning G.

This paper presents 7DS, a novel peer-to-peer data sharing system. Peers can be either mobile or stationary. 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. It runs as an application complementary to other data access approaches (such as via base stations or info-stations). 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 in data dissemination for mobile devices. We model several general data dissemination approaches and investigate the effect of the wireless coverage range,network size, query mechanism, cooperation strategy among the mobile hosts and power conservation with a large number of user mobility scenarios. Using theory from random walks and 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.