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Aiming at optimizing the use of a wireless sensor network (WSN) as a miniature components integrated on chip (according to SoC technology), the adoption of specific protocols in the fields of applications of such network type is crucial. WSNs differ largely from the traditional wireless networks, they consequently require the use of new variations of energy-preserving protocols to ensure a prolonged...
In a wireless sensor network (WSN), the heterogeneous types of sensors can be viewed as intelligent agents that interact with each other locally. The sensors interact with each other either in a cooperative way to form coalitions or in a noncooperative way to deal with conflicts. In this way, the sensors ultimately form desirable topology patterns in terms of various applications. This article addresses...
This paper presents an original performance analysis of the contention-based channel reservation schemes, namely UNI MAC in wireless communication systems. Here we mathematically derive the expression of the performance in term of success rate where the impact of misbehaving users is also taken into account. Validated with the simulation results, our numerical results show that the overall performance...
Due to very sensitive and crucial nature of the collected data, any wireless sensor network (WSN) has to handle efficiently securing it as well as to employ energy-aware and delay-sensitive algorithms in its all layers from application to the physical. These key topics strictly related to each other are of high importance for building and maintaining reliable and long-lasting WSN applications. However,...
Energy consumption in wireless sensor networks is an important topic, given the scarcity of resources of the node platforms. This work analyzes the relation between the increase in lifetime and the connectivity properties of a new topology control mechanism for wireless sensor networks. It is possible to extend the functional lifetime of a network by controlling its topology through a scheme that...
Data fusion or In-network processing methods were often adopted in Wireless Sensor Networks (WSNs) to reduce data communication and prolong network lifetime, which made WSNs application can be described as a set of tasks (sensing, processing) and dependencies among them. Task assignment has become an important problem which needed to be resolved for different tasks assignment caused different energy...
Many applications in Wireless Sensor Networks require collecting all data without loss from nodes. End-to-End data retransmission, which is used in the Internet for reliable transport, becomes very inefficient in Wireless Sensor Networks, since wireless communication, and constrained resources pose new challenges. We look at factors affecting reliability, and search for efficient combinations of the...
Identification of wireless sensor nodes based on the characteristics of their radio transmissions can provide an additional layer of security in all-wireless multi-hop sensor networks. Reliable identification can be means for the detection and/or prevention of wormhole, Sybil and replication attacks, and can complement cryptographic message authentication protocols. In this paper, we investigate the...
ldquoParticipatory sensingrdquo is an exciting new paradigm where people voluntarily sense their local environment and share this data using mobile phones and the Internet. It can revolutionize applications such as intelligent transportation, public health and social networking. However, a major concern is the amount of trust that can be placed in the shared data. We address this concern in our demonstration...
Real-time patient monitoring is critical to early detection of clinical patient deterioration in general hospital wards. A key challenge in such applications is to reliably deliver sensor data from mobile patients. We present an empirical analysis on the reliability of data collection from wireless pulse oximeters attached to users. We observe that most packet loss occur from mobile users to their...
In wireless sensor networks that consist of a large number of low-power, short-lived, unreliable sensors, one of the main design challenges is to obtain long system lifetime, as well as maintain sufficient sensing coverage and reliability. A critical issue in wireless sensor networks is represented by the limited availability of energy within network nodes; therefore making good uses of energy is...
Clustering is an effective approach to enhance performance in large-scale wireless sensor networks. SMCA (small-world model based clustering algorithm), a new clustering algorithm for wireless sensor networks is proposed in this paper, with high clustering coefficient and fault-tolerant properties. SMCA selectively remove some links in a virtual way by the analysis of the edges' clustering coefficient...
The rapid expansion of wireless sensor networks technology has created an unprecedented opportunity to gather and extract information from wireless sensor networks. How to gather sensed information in energy efficient way is critical problems recently. Clustering technique has been proven to be an effective approach for data-gathering in wireless sensor networks. However, in a mobile environment,...
GEM is an ingenious routing algorithm for wireless sensor networks that is based on the idea of graph embedding. However, it cannot survive edge failures well because reliability was not taken into consideration seriously when it was designed. In this paper, we propose UD-GEM, a GEM-based multi-path routing algorithm that improves the reliability performance of GEM significantly. Specifically, in...
Aimed at reliable communications in industrial wireless technology, this paper first introduces the current major wireless protocol, and challenging industrial environment, second addresses a distributed cooperative wireless sensor networks together with dynamic spectrum management scheme based on hybrid spread spectrum scheme. Finally through the theoretical analysis and evaluation, it is proved...
Microclimates in many wildland cultural heritage sites are not under surveillance up to now, due to the lack of power supply and network access. However, accurate microclimate data in cultural heritage sites are very important for research and conservation. In this paper, we present a wireless sensor system for long-term microclimate monitoring in wildland cultural heritage sites, and its deployment...
In this paper, we investigate the performance of quality of service (QoS) differentiation schemes for the IEEE 802.15.4 carrier sense multiple access with collision avoidance (CSMA-CA) protocol. The differentiation schemes provide QoS prioritization in terms of data latency and transmission reliability in wireless sensor networks. In the latency differentiation scheme (LDS), we use different strategies...
Work mode of ZigBee WSN substantially reduce the power consumption of sensor nodes and the probability of information collision. Meanwhile, network life span is extended. Because of the cyclic redundancy check and the encryption algorithmpsilas application, the security and reliability of the system are greatly improved.
Recent advantages in wireless communication and electronics, lead to a large scale of sensor networks development and different usages possible. Specific traits of these networks such as dynamic treatment, large scale, long life-time and being multi-purpose with specific limitations of these kinds of networks such as limited bandwidth, low dry cell capacity, limited processor and memory are caused...
Recent advances in wireless communications and micro-electronics have enabled the development of low-cost wireless sensor networks. In this paper, a reconfigurable wireless sensor network platform for reliable detection and quick reporting of random and temporary events is being described. Bluetooth, which has the key features like low cost, low power and robustness, is used to establish the communication...
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