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Data gathering, either for event recognition or for monitoring applications is the primary intention for sensor network deployments. In many cases, data is acquired periodically and autonomously, and simply logged onto secondary storage (e.g. flash memory) either for delayed offline analysis or for on demand burst transfer. Moreover, operational data such as connectivity information, node and network...
In the past couple of years, many Energy-Efficient Medium Access Control (E2-MAC) protocols for all kinds of wireless networks have been proposed. Many of them are based on Preamble Sampling (also referred-to as Low Power Listening) with asynchronous wake-up schemes and brief periodic polls for channel activity. Although these protocols have proven to almost reach the theoretic lower bounds of energy-efficiency...
In this paper we propose a routing backbone construction mechanism that exploits and uses the synchronization messages exchanged by synchronized contention-based MAC protocols. Due to the usage of synchronization messages no additional control traffic is required to setup the routing backbone. Every node running a synchronized contention-based MAC protocol follows a given listen/sleep cycle. Because...
Energy efficiency is a major concern in the design of wireless sensor networks (WSNs) and their communication protocols. As the radio transceiver typically accounts for a major portion of a WSN node's power consumption, researchers have proposed energy-efficient medium access (E2-MAC) protocols that switch the radio transceiver off for a major part of the time. Such protocols typically trade off energy-efficiency...
Wireless mesh networks can be used for various applications such as extending the coverage of wireless networks or connecting remote users to the Internet. By using wireless mesh networks for interconnecting meteorological weather stations to the Internet, multi-media sensor data can be observed in real-time. In such an application scenario, the wireless multi-hop network must fulfill high application...
In this paper the classification of discrete events, computed on tiny wireless sensor nodes, is investigated. Three different classifiers are evaluated: a Bayesian classifier, a fuzzy logic controller (FLC), and a neural network approach. The target applications pose several requirements on the classifiers. No a priori knowledge about the event classes is available. Events are only observable as collections...
Cross-layer design has been proposed as a promising paradigm to tackle various problems of wireless communication systems. Recent research has led to a variety of protocols that rely on intensive interaction between different layers of the classical layered OSI protocol architecture. These protocols involve different layers and introduce new ideas how layers shall communicate and interact. In existing...
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