Opportunistische Weiterleitung von netzwerkcodierten Multicast-Übertragungen in drahtlosen Sensornetzen

In dieser Dissertation wird ein Kommunikationsschema für drahtlose Sensornetze entwickelt, welches die Multicast-Kommunikation unterschiedlicher Anwendungen mittels Netzwerkcodierung überlagert. Eine besondere Herausforderungen stellen hierbei die Eigenschaften drahtloser Sensornetze dar. Die eingeschränkte Netzwerkkapazität beschränkt zugleich das erreichbare Maximum der handhabbaren Datenmenge

Energy efficient broadcasting in WSNs with cocasting and power control

In the design of Wireless Sensor Networks (WSNs), energy conservation is a goal at all system levels, from the application down to the hardware. This paper focuses on networklevel opportunities for energy conservation, with emphasis on the multi-hop transmissions, topology control and routing-level issues. Specifically, the paper considers energy efficient information broadcasting in WSNs deploying co-operating nodes which by adjusting their transmission ranges minimize the total transmitted power in the network. To this end, the design of routing protocols with a single relay is proposed for multiple multicast sessions in a network with randomly distributed nodes. The protocols take advantage of topological diversity created by adapting the transmission power and exploit the benefits of network coding in a system where nodes are periodically generating data packets. Energy efficiency of the conventional, store-and-forward, and network coding based relaying schemes is analyzed in different propagation conditions and for various node densities