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University: Helsinki University of Technology TKK, Finland Routing and Topology Control Algorithms for Sensor Networks This project concentrates on fundamental topology control and routing problems in sensor networks. These networks will contain a large number of intercommunicating devices (nodes), which in most of the purported applications will be energy-constrained, prone to unexpected malfunctions, and possibly mobile. Our aim is to develop improved networking algorithms and protocols for such a dynamic operational environment. The focus of the present work is on a novel “power aware dynamic source routing” protocol. The research question is how to take battery power of nodes into account when making dsr routing decisions so as to increase network lifetime. Opnet is being used to develop and test this new protocol. Further topics of study include:
By increasing the transmission power of the nodes, more nodes can be reached within one hop. On the other hand, this increase will imply that more energy is used and the time until the battery runs out of power will be shorter. The question we have studied is how to dynamically adjust the transmission powers, in order to keep the network fully connected as long as possible.
Sensor networks may be used, for instance, in environmental applications to send measurement data to processing nodes. The research question is how to place the relaying and destination nodes optimally, taking into account the limited energy supply at the sensor and relaying nodes.
Faults are to be expected in nodes which are placed in harsh environments. The research question is how long the network can stay functional and intact when individual sensors become faulty. We intend to simulate ad hoc sensor networks with fault tolerance mechanisms.
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