Energy and QoS trade-off analysis of S-MAC protocol in wireless sensor networks

In this paper, we present a new analytical model to study the trade-off between energy consumption and quality of service (QoS) requirement (e.g., service delay and throughput) in S-MAC protocol. Our model takes into account the impact of several factors together, including periodic listen and sleep cycle, various incoming traffic loads, the backoff mechanism in S-MAC, the queuing behavior at the MAC layer, the dependency of service delay distributions among the nodes, and the imperfect wireless channels. Simulations show that our analytical results are highly accurate in evaluating the performance of S-MAC under different traffic and channel conditions.