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Routing protocols for sensor networks are often designed with explicit assumptions, serving to simplify design and reduce the necessary energy, processing and communications requirements. Different protocols make different assumptions - and this paper considers those made by the designers of RPL - an IPv6 routing protocol for such networks, developed within the IETF. Specific attention is given to the predominance of bidirectional traffic flows in a large class of sensor networks, and this paper therefore studies the performance of RPL for such flows.
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