Wireless sensor networks (WSNs) are increasingly utilized in all kinds of environments, their potential applications being constantly updated and extended. As a result, there is a particularly high interest in the research community to solve their identified problems and challenges, particularly in terms of energy consumption and autonomy, given the limited power source of their nodes. vi Abstract particular controlled degradation strategy being confirmed to simultaneously extend the effective lifetime and provide an improved QoS from the application's perspective. This QoS-centric approach was subsequently applied to a more realistic and complex WSN scenario to further confirm its validity and effectiveness. This research effort resulted in one of the main contributions obtained in the course of this Ph.D.: a complete cross-layer strategy focused on improving the QoS of WSNs. Specifically, this strategy consists in an application-aware clustering routing protocol aimed at providing an enhanced management of the QoS. The proposed protocol features a cross-layer approach by considering application-layer QoS requirements such as the throughput and latency, when selecting the configuration parameters of the lower layers.
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