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In this paper, coordination and communication problems in Wireless Sensor and Actor Networks (WSANs) are jointly addressed in a unifying framework. A sensor-actor coordination model is proposed, based on an event-driven partitioning paradigm. Sensors are partitioned into different sets and each set is constituted by a data-delivery tree associated with a different actor. The optimal solution for the partitioning strategy is determined by mathematical programming, and a distributed solution is proposed. In addition, a new model for the actoractor coordination problem is introduced. The actor coordination is formulated as a task assignment optimization problem for a class of coordination problems in which the area to be acted upon needs to be optimally split among different actors. An auctionbased distributed solution of the problem is also presented.Performance evaluation shows how global network objectives, such as compliance with real-time constraints and minimum energy consumption, can be achieved in the proposed framework with simple interactions between sensors and actors that are suitable for large-scale networks of energy-constrained devices.
Wireless Sensor and Actor Networks, Mathematical programming/optimization, Real-Time Communications, Energy Efficiency, Task Allocation

I. F. Akyildiz, T. Melodia, D. Pompili and V. C. Gungor, "Communication and Coordination in Wireless Sensor and Actor Networks," in IEEE Transactions on Mobile Computing, vol. 6, no. , pp. 1116-1129, 2007.
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