Um protocolo cross-layer híbrido para redes de sensores sem fio baseado em backbone

Abstract

Wireless sensor networks are networks formed by autonomous sensor nodes, powered by small batteries. This makes energy efficiency a very important question in developing protocols for this type of network. This problem is addressed in several ways, and the technique of work cycles as a way of saving energy is one of the methods employed. In this strategy, the radio transceiver and other power centers of the sensor node remain off most of the time. This strategy causes a propagation delay of messages between neighbors, resulting in an increase in end-to-end latency in the network. Our work presents a new cross-layer protocol based on backbone, whose goal is the reduction of end-to-end latency with low change in energy consumption. BWise is based on WiseMAC and uses duty cycles and message forwarding through a backbone. In simulations where the backbone can be used for message transport, the results showed that the implemented protocol obtained a reduction in the end-to-end latency when compared to WiseMAC and X-MAC, protocols in literature, maintaining an energy consumption compatible behavior.