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Energy is a scarce resource in wireless sensor networks. Usually, during the deployment phase an appropriate duty cycle has to be found to adjust the trade-off between energy consumption and transmission delay. In this paper an adaptation algorithm for the duty cycle adjustment during runtime of the sensor network is proposed. Thereby, the traffic originating from sensor nodes is monitored in the...
This paper introduces a new strategy for data gathering in wireless sensor networks that takes into account the need for both energy saving and for a reasonable tradeoff between robustness and efficiency. The proposed algorithm implements an efficient strategy for retransmission of lost packets by discovering alternative routes and making clever use of multiple paths when necessary; in order to do...
In recent years sensor networks have gained a lot of interest for industrial applications. The target of this paper is to define an analytical framework to evaluate the transient behavior of a sensor network in which sensors implement the energy-saving technique of idle/active states. The model captures the behavior of the battery lifetime of each sensor, and is able to evaluate the distribution of...
The efficient use of the limited energy resources is the key challenge in the design of wireless sensor networks. Due to the paramount importance of the energy conservation, all protocols for these networks have to be designed taking into account their energy consumption. When simulation is used to analyze the performance of any energy-aware algorithm, it is necessary to have the information about...
The precise and "cost-efficient" localization is of particular interest in large wireless sensor networks. For this purpose, the pertinent literature proposes various algorithms, which significantly differ in localization precision, energy consumption, and hardware requirements. One of those algorithms, also known as coarse-grained localization with centroid determination, has received particular...
IEEE 802.15.4 is an emerging standard specifically designed for low-rate wireless personal area networks (LR-WPAN) with a focus on enabling the wireless sensor networks. It attempts to provide a low data rate, low power, and low cost wireless networking on the device-level communication. In this paper, we have established a realistic environment for the preliminary performance evaluation of the IEEE...
Measurements of human physiological data allow inferring information on the mental and emotional state of a human. An increasing number of application developers and scientists of different domains want to make use of this additional information on users. To be accepted in practical application, systems of this sort have to be easy to use, should not intrude the user by wires, and it should be easy...
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