ART: an asymmetric and reliable transport mechanism for wireless sensor networks

Many applications developed for wireless sensor networks (WSNs) demand for Re-liable communication service, since majority of these applications are event-critical applications. There has been a vast body of knowledge on reliable data transfer in wireless networks; however, many of those solutions are not applicable to WSNs due to the fact that they address the problem by oering per message transport reliabil-ity. However, densely deployed sensor nodes can generate many redundant messages that essentially indicate the same event from the area of interest, this message-level reliability usually poses signicantly high and unnecessary communication costs. In this paper, we address the problem of reliable data transferring by rst dening event reliability and query reliability to match the unique characteristics of WSNs. Unlike other studies on transport protocols for WSN, we consider event delivery in conjunction with query delivery. For the purpose, we propose an energy-aware sensor classi cation algorithm to construct a network topology that is composed of sensors in providing desired level of event and query reliability. Using such an approach, reliability is granted in the sense that critical event reports are received by the sin