Evaluation of the reduction of NDT in WSN with asymmetric schedule-based asynchronous duty cycle mechanisms

With the development of wireless technologies and the proliferation of sensors, Wireless Sensor Networks (WSNs) have been widely used in many applications. However, their energy constraints make energy reduction one of the main project concerns. Among the several solutions in the literature, schedule-based asynchronous duty cycle methods are the simplest because they do not require synchronization mechanisms, protocols nor specific hardware, while facilitating the entry of new nodes. However, scenarios with sporadic events can benefit from nodes operating on different schedules. This work evaluates asymmetric asynchronous duty cycle schedules for possible use in such scenarios. Using numerical simulations, we show that, for some asymmetrical pairs of schedules, the overlap of active slots is guaranteed which enables the communication between the nodes. Also, depending on the choice of the pairs of schedules, an asymmetric setup allows a reduction in the Neighbor Discovery Time in relation to the symmetric methods.