Robust Topology Using Reconfigurable Radios in Wireless Sensor Networks

Using SDR technology, the distributed algorithm RMA is used by sensor nodes to reconfigure their radio according to some predefined radio-modes, such that the resulting topology is connected to the sink. This mechanism reduces interference and increases data delivery rate. In this paper we extend RMA by adding a low overhead mechanism to be used in the presence of a primary user. Sensor nodes operating on the same frequency as the primary user will reassign their radio-mode such that the resulting topology does not interfere with the primary user. We analyze the performance of our distributed algorithm using ns-3 simulations.