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With the coming wide-spread deployment of Internet of Things (IoT) applications, particularly robustness of the wireless transmissions becomes an issue. We focus on the IEEE 802.15.4 MAC protocol, which has been widely adopted for a variety of Wireless Personal Area Network (WPAN) applications. IEEE 802.15.4 defines a node synchronization strategy using beacons for achieving robust and real-time capable...
Energy conservation is one of the major aspects in Wireless Sensor Networks since it impacts the network lifetime. In this paper; we focus on the energy conservation in the MAC protocol which is basically used for the transmitting of data/selecting the channel for transmission. The energy conservation process is carried out by using the controlled access protocol. The paper emphasizes on operation...
With the increasing deployment of wireless sensor networks (WSNs), the demand for energy efficiency (EE) and Quality of Service (QoS) guarantee for such networks is on the rise. In a distributed WSN, the EE could be directly related to the operational expenditure (OPEX) due to the frequent replacement of batteries. An increasing EE helps prolong the network lifetime. Energy efficiency in a WSN can...
IEEE 802.15.4 standard is designed for low power wireless personal area networks (LR-WPANs). Recently, both industry and academia are attracted to IEEE 802.15.4 because of its applicability in wireless sensor networks (WSNs) and wireless body area sensor networks (WBANs). An important feature of IEEE 802.15.4 is the very low duty cycle operation to conserve sensor node's energy. In this paper, we...
Novel applications running on top of wireless sensor networks set new QoS requirements, demand devices' seamless connectivity, and call for new communication paradigms such as opportunistic spectrum access. However, realization of opportunistic spectrum access without causing interference to primary users poses significant challenges that are further exacerbated by the power constrained nature of...
Wireless sensor network consists of spatially distributed autonomous devices using sensors to monitor various conditions. There are many issues concerned with wireless sensor networks, namely routing to save energy, fault tolerance, production cost, scalability, data aggregation, security and quality of service. Since the network life time depends on power consumption, energy is considered as an important...
Using wireless sensor networks (WSNs) for intrusion detection in critical area and border surveillance has been an active research topic in the last decade. In this paper, we present a novel approach for intrusion identification in the forest region. This approach is based on the ultra wideband (UWB) WSNs model. It shows the potential for exploiting off-the-shelf UWB transceivers or existing WSNs...
In wireless rechargeable sensor networks (WRSN), rechargeable sensor nodes harvest ambient RF energy from power sources such as the RFID readers. However, the simultaneous transmissions may cause severe communication collisions. Different from traditional approaches which mainly resolve such collisions at the MAC layer, in this work we optimize the deployment of RFID reader in order to avoid the communication...
In this demo, a wireless multichannel measurement system based on an ASIC designed for bioelectrical impedance (BI) measurements in a wide frequency range is presented. The on-chip spectrometer provides powerful measuring capabilities and, together with a commercial ZigBee device, constitutes a wireless node to develop portable health monitoring applications.
Cluster scheduling is a crucial issue in cluster-tree Wireless Sensor Networks (WSNs). The paper presents a methodology that provides a Time Division Cluster Scheduling (TDCS) mechanism based on the shortest path problem. The objective is to meet all the flows' deadlines defined by the maximum number of crossed periods for each flow to reach its destination assuming one collision domain. Formulating...
IEEE 802.15.4 defines a duty cycle based medium access control (MAC) protocol to reduce the energy consumption for devices in wireless sensor networks (WSNs). A low duty cycle significantly improves the energy efficiency but reduces the available transmission time, thereby increases end-to-end delay. In this paper, we solve an adaptive duty cycle control problem for beacon-enabled IEEE 802.15.4 networks,...
In this paper, we are interested in the description of a cross-layer architecture that supports service differentiation for real-time and best-effort traffics in Wireless Sensor Networks (WSN). We present our mathematical model that combines parameters from network and MAC layers. We aim to estimate and to enhance the throughput of multi-hop WSNs and the stability of the forwarding queues used for...
Barrier coverage is an important issue in wireless sensor networks. In this paper, we study the problem of how to find barrier gaps in weak barrier coverage and mend gaps via sensor rotation where the network consisting of line-based deployed directional sensors. We first propose a gap finding algorithm to find all sub-barriers and barrier gaps in the network. We then propose two algorithms to mend...
Wireless Sensor Networks present the challenge of including robust security mechanisms in resource-constrained and low-power devices. Cryptography is at the heart of security and key management is a fundamental part of it. Adequate analysis and selection of efficient cryptographic algorithms and key management schemes are required. This paper presents a key management implementation using an FPGA...
In several monitoring applications, such as those that can be found in industrial factory floor, it may be necessary to obtain an uniform sensing coverage, providing as much as possible the same coverage degree for the entire network area. The IEEE 802.15.4 has become an important standard in wireless sensor networks. However, the use of cluster-tree topology in these networks hampers a fair and uniform...
In this paper we investigate how to efficiently and effectively use histogram queries for processing quantile queries in wireless sensor networks. A major concern when processing queries within such an environment is to minimize the energy consumption by the network nodes, thus extending the networks lifetime, e.g., the time when the first node runs out of energy. Towards that goal, we define a cost...
In this paper, we have studied image transmission over Wireless Multimedia Sensor Network based on IEEE-802.15.4 MAC Protocol. The focus of the research is on Packet length, in order to attain high level of throughput. IEEE 802.15.4 is a low rate MAC Protocol and maximum data rate of 250Kbps. Physical channel error rate is a significant parameter influencing Throughput. Channel error cause packet...
IEEE 802.15.4 standard is a relatively new standard designed for low power low data rate wireless sensor networks (WSN), which has a wide range of applications, e.g., environment monitoring, e-health, home and industry automation. In this paper, we investigate the problems of hidden devices in coverage overlapped IEEE 802.15.4 WSNs, which is likely to arise when multiple 802.15.4 WSNs are deployed...
Within reactive topology control, a node determines its adjacent edges of a network subgraph without prior knowledge of its neighborhood. The goal is to construct a local view on a topology which provides certain desired properties such as planarity. During algorithm execution, a node, in general, is not allowed to determine all its neighbors of the network graph. There are well-known reactive algorithms...
Sensor nodes in a network consume energy in a non-uniform manner. Designing clustering protocols that are heterogeneity aware is still an open issue in sensor networks. This work focuses on hierarchically clustered heterogeneous sensor networks. Sensor nodes organize themselves in self organized groups called clusters. Each cluster consists of a cluster head and some member nodes. The sensor network...
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