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G. Kaufmann:
"P2P Information Sharing in Pervasive Environments";
Supervisor: S. Dustdar, M. Treiber; Institut für Informationssysteme, AB Verteilte Systeme, 2012.

The ever increasing pervasiveness of mobile end user devices (Smartphones, Tablets, Laptops) results in a ever increasing need to share information in a peer to peer manner (without the use of a central mediator). Existing solutions for information sharing are based (for example cell based technologies like 3G or Wifi/WLAN) are dependent on a infrastructure that might not be available in every context. Other solutions like Bluetooth and NFC, that are especially designed for peer to peer information sharing, are not always available and platform independently usable (and also have other drawbacks).
The first part of this work will evaluate which of these transmission technologies are usable in which peer to peer sharing context, if there is a technology that is always preferable, or if a combination of technologies is the best choice. The focus of this work will be on mobile devices like Smartphones and Tablets.
This focus on smartphones and tablets builds the reason for the second part of this work, in which the most used transmission technologies are empirically evaluated on their energy consumption
and efficiency: the central result of this analysis allows a direct comparison of these technologies by their energy consumption.
Finally a method, based on the entropy analysis of information, is discussed that allows to further reduce the energy that is consumed during transmission.