Abstract—Wireless sensor networks’ most critical aspect is represented by very limited energy budget. Typical applications need long lifetime networks but usually replacing batteries is not practical. Therefore it is necessary to carefully design all network levels and protocols to save energy. This paper is devoted to the investigation of the link layer with the proposition of four information delivery mechanisms and the study of their energy consumptions. Comparisons between the different proposed methods are realized in two situations: by referring to an actual sensor node, μAMPS-1, and by developing a more generic parametric model. With μAMPS-1 data we can obtain an energy gain ranging from 5% to 15%, by using intermediate nodes as digital repeaters and decoding operations performed only at the destination instead of a hop-to-hop decoding solution. Note how the performance depends on several parameters, e.g., the hardware technology, the source to destination distance, the number of hops involved; we emphasize in particular the necessity to distribute the packets forwarding among an optimal number of intermediate hops.
On the Retransmission Methods in Wireless Sensor Networks
TADDIA, Chiara;MAZZINI, Gianluca
2004
Abstract
Abstract—Wireless sensor networks’ most critical aspect is represented by very limited energy budget. Typical applications need long lifetime networks but usually replacing batteries is not practical. Therefore it is necessary to carefully design all network levels and protocols to save energy. This paper is devoted to the investigation of the link layer with the proposition of four information delivery mechanisms and the study of their energy consumptions. Comparisons between the different proposed methods are realized in two situations: by referring to an actual sensor node, μAMPS-1, and by developing a more generic parametric model. With μAMPS-1 data we can obtain an energy gain ranging from 5% to 15%, by using intermediate nodes as digital repeaters and decoding operations performed only at the destination instead of a hop-to-hop decoding solution. Note how the performance depends on several parameters, e.g., the hardware technology, the source to destination distance, the number of hops involved; we emphasize in particular the necessity to distribute the packets forwarding among an optimal number of intermediate hops.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
