Effects of power conservation, wireless coverage and cooperation on data dissemination amon.pdfVIP

Effects of power conservation, wireless coverage and cooperation on data dissemination among mobile devices∗ Maria Papadopouli Henning Schulzrinne Department of Computer Science Columbia University New York, NY10027 {maria,hgs}@ ABSTRACT infostations are “information kiosks”, for example, located This paper presents 7DS, a novel peer-to-peer data sharing at traffic lights, building entrances and airport lounges. Typ- system. 7DS is an architecture, a set of protocols and an ically, an infostation is a server attached to a data repository implementation enabling the exchange of data among peers and a wireless LAN. When a wireless device is in close prox- that are not necessarily connected to the Internet. Peers imity to an infostation, it can query the server and access the can be either mobile or stationary. It anticipates the in- information. Both of these approaches need an infrastruc- formation needs of users and fulfills them by searching for ture. If the wired infrastructure is low-bandwidth, they can information among peers. We evaluate via extensive simula- be combined by having caches at the base stations. In that tions the effectiveness of our system for data dissemination case, when the wireless device is within the wireless range among mobile devices with a large number of user mobil- of the servers, it can use the cache or the information server ity scenarios. We model several general data disseminat