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Embedded applications in the field of wireless sensor nodes are becoming more and more sensitive to energy consumption. Actually, this latter not only depends on the autonomy of the hardware part of network elements but also on the applications they support. Designers must so take into account the constraint of energy consumption when specifying and designing an application. Instead of considering...
When we try to use a sensor network outdoors, for purposes such as collecting information related to large-scale natural disasters and agricultural applications, it often happens that the communication distance is insufficient. Many sensor network users in Japan utilize sensor nodes that use 2.4 GHz frequency. The communication distance of these sensor nodes is short (a few hundred meters). Therefore,...
The behavior of Wireless Sensor Networks (WSN) is nowadays widely analyzed. One of the most important issues is related to their energy consumption, as this has a major impact on the network lifetime. Another important application requirement is to ensure data sensing synchronization, which leads to additional energy consumption as a high number of messages is sent and received at each node. Our proposal...
In this paper, we report the sensor function design and implementation of a wireless sensor network application for measuring environmental acoustic noise. The system is built on ATmega128 and CC2420 platform. The protocol stack is based on CiNet stack with a global synchronization scheme and supports multi-hop communications. Strict filtering function specified by ITU-R 468 (namely A-weighting) is...
Sensor-medium access control (S-MAC) protocol is a well-known MAC protocols designed for wireless sensor networks (WSNs). In this paper, we examine security vulnerability in S-MAC and analyze the power consumed at each stage of S-MAC according to vulnerability of denial of service (DoS) attack. From our analytical results, it can be induced that there is a need for a power-efficient authentication...
Wireless sensor networks can be used in industrial applications to overcome some limits of wired fieldbuses. This paper proposed a reliable wireless communication protocol (RWCP) for industrial applications. Protocol design focused on network reliability and power consumption. Reliability was improved by creating redundant links dynamically. Deterministic communication was provided through super frame...
Since WSNs have restricted energy sources, the energy efficiency of a synchronization scheme is as important as the accuracy of a clock. To accomplish both the energy efficiency and the accuracy, we propose a new clock synchronization scheme called Chaining Clock Synchronization (CCS). In CCS, a subset of nodes whose transmission range cover the overall network carries out a two-way message exchange...
Variable preamble sampling is a technique used for accessing the medium in low-power constrained networks such as wireless sensor networks. We provide an optimal bound for power consumption in preamble sampling techniques, and we present a model of this technique as a function of power consumption and time of radio utilization. We compare our model by means of experimental experiences performed with...
Due to the ability of sensor nodes to collaborate, time synchronization is essential for many sensor network operations. This work presents a novel clock synchronization method for energy-constrained wireless sensor networks (WSNs). To conserve WSN energy, this study adopts the flooding time synchronization scheme based on one-way timing messages. Via the proposed approach, the maximum-likelihood...
In this paper, a time synchronization method for underwater wireless sensor networks (UWSN), UA-TSP, is presented. The proposed method not only compensates the main time delay in acoustic communication, but also decreases the cumulate errors in the multi-hop scene through a loop convergence method. The implementation of UA-TSP is combined with the nodes discovering process, and less control frame...
Operational lifetime of wireless sensor network (WSN) nodes is crucial in a variety of monitoring applications. As the radio chip is usually the most power-hungry component in small, low-cost WSN devices, battery lifetime can be extended by reducing the duty-cycle of the radio module. In fact, the wireless chip could be switched on just to run the tasks of the considered application, while it could...
This paper presents an implementation of a new time synchronization scheme for energy efficient wireless sensor networks (WSN). This scheme, called sliding clock synchronization (SCS) is able to compensate for static and dynamic drifts in the frequencies of crystals used in the WSN nodes. As power is a very scarce and critical resource in most WSN, a tight synchronization scheme can drastically reduce...
Time synchronization provides an essential service for wireless sensor networks. Most of previous works focus on improving synchronization accuracy. However, other design concerns, such as global time continuity, power efficiency and adaptability, arise from real applications' requirements and receive more and more attentions. During synchronization, most of approaches choose a specific sensor node's...
In this paper we propose a scheme for self-organizing sensor networks; the scheme allows a sensor network to adapt to topological changes, include new batches of sensors, and disregard the sensors that have depleted their power reserves, or have been compromised. The algorithm for self-organization allows the sensor network to carry out its mission, has built-in provisions for information assurance,...
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