Abstract
Wireless Sensor Networks are a promising way to interconnect smart objects sensing and acting on the environment, enabling the Internet of Things. However, this kind of network is particularly constrained: nodes have limited energy reserve, their CPU and memory resources are limited, and the radio bandwidth is very low. After exposing the main approaches for the routing and MAC layers, the authors explain why they must be jointly optimized. They explain why a metric reflecting the radio link quality is necessary and how it should integrate different criteria in layers 2 and 3. The authors also introduce a new architecture based on IEEE 802.15.4 and RPL so that both protocols work in symbiosis. Finally, they conclude detailing some open problems in this research area.
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