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Recent advances in localization technologies and algorithms for Wireless Sensor Networks (WSN) motivate the exploitation of location information in routing protocols. In this paper the authors consider the geographic forwarding of sporadically generated alarm messages. Their objective is to optimize sensor's energy consumption while respecting QoS constraints on transmission delay. For instance, they propose an optimal distributed relay selection policy for WSN with duty-cycling sensors based on a Markov Decision Process (MDP) with complete information. Also, they establish sufficient conditions for optimality of threshold policies. Then, end-to-end performances for a heuristic multi-hop relay selection strategy are established. Finally, they extend their model to account for queuing capabilities at sensor level.
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