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Enabling real time applications in Wireless Sensor Networks (WSNs) demands certain delay and bandwidth requirements which pose more challenges in the design of networking protocols. Therefore, enabling such applications in this type of networks requires energy and Quality of Service (QoS) awareness in different layers of the protocol stack. In many of these applications (such as multimedia applications,...
Virtual coordinate based routing (VCR) is a class of simple scalable routing schemes for sensor networks. VCR relies on coordinates based on the number of hops to a set of anchors, rather than on geographical coordinates. Multiple nodes with identical coordinates and local minima encountered during routing degrade the performance of VCR. Properties of virtual coordinate systems are analyzed to provide...
One of the exigent problems in wireless sensor networks is the recognition of network boundary and the detection of holes within the network. In this paper, we propose an algorithm in which every node in the network self-detects whether it is a boundary node or an inner node by utilizing the available connectivity information and making no assumptions about the location awareness. The algorithm is...
In this paper, we establish a relationship between resource discovery protocol and cluster head election procedure. While doing so, we propose a multi-resource-criteria cluster head election mechanism that reduces the computational and communication overhead incurred in resource discovery. The consequent resource discovery protocol thus necessitates a minimalist exchange of information that we provide...
We consider the problem of using wireless sensor networks (WSNs) to measure the temporal-spatial field of some scalar physical quantities. Our goal is to obtain a sufficiently accurate approximation of the temporal-spatial field with as little energy as possible. We propose an adaptive algorithm, based on the recently developed theory of adaptive compressive sensing, to collect information from WSNs...
This paper presents a study on power management optimisation over a sensor network. We have proposed a set of management rules which are executed by each sensor of the network. These rules adapt themselves to sensors depending on their energy status and on the network energy. Periodically, each sensor computes its rules and decides how to behave (sleeping during a long period or not). An experimentation...
This paper considers the use of servo-mechanisms as part of a tightly integrated homogeneous wireless multimedia sensor network (WMSN). We describe the design of our second generation WMSN node platform, which has increased image resolution, in-built audio sensors, PIR sensors, and servomechanisms. These devices have a wide disparity in their energy consumption and in the information quality they...
In rescue scenarios, real-time requirements are one key issue when using wireless sensor networks (WSNs) for tracking and monitoring of rescue forces. If a node detects an alarm condition, the alarm message must be delivered to the base station in time. To guarantee the timely delivery the whole system architecture has to fulfill real-time requirements. There are only a few real-time architectures...
In wireless sensor networks, energy is commonly a scarce resource, which should be used as sparingly as possible to allow for long node lifetimes. It is therefore mandatory to put a focus on the development of energy-efficient applications. In this paper, we analyze the achievable energy gains when packet payloads are compressed prior to their transmission. As the radio transceiver chips are the predominant...
This paper proposes multi-key encryption scheme and engine architecture (MKE) that increases security and optimizes energy efficiency of sensor networks, while minimizing modifications to existing implementations. The scheme improves security of AES against correlation power analysis (CPA) attack by employing MKE engine, breaking the correlation between power consumption and the used key. Other schemes...
Recent advances in wireless sensor networks have led to many new routing protocols specifically designed for sensor networks. Almost, all these routing protocols considered energy efficiency as the objective in order to maximize the whole network lifetime. However, the introduction of video and imaging sensors has introduced additional challenges. Transmission of these flows requires both energy and...
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