Optimized energy-latency cooperative transmission in duty-cycled wireless sensor networks

Aiming to maximum the lifetime of battery-powered sensors, many research efforts concentrate on sleep schedule that provides duty cycles for nodes to cut down energy consumptions in idle listening. However, this energy-efficient approach introduces the data delivery latency issue in wireless sensor network(WSNs). In order to balance latency and energy in duty-cycled WSNs, we exploit the range extension feature of cooperative communication to tackle this issue. In the paper, we first present the way of applying cooperative communication so as to reduce latency. Then, based on the formulated energy model, we come up with the solution to minimize the end-to-end energy expenditure. Finally, according to above analysis, an energy-efficient and delay-tolerant cooperative transmission algorithm(EDTCT) is proposed. The experiments validate that our EDTCT algorithm outperforms the traditional routing way both in end-to-end sleep latency and energy savings.