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Application areas of Wireless Sensor Networks (WSNs) are increasing from time to time. Failure detection and recovery mechanism is crucial for WSNs as sensor nodes are resource-constrained and deployed in distributed hostile environments that necessitate such mechanism. To avoid unnecessary constrained resource consumption and ensure the quality of services, it is important to use efficient failure...
To solve the problem that the localization accuracy of centroid algorithm depends heavily on the anchor density, an improved centroid algorithm based on possible position set is proposed. Firstly, the unknown node uses centroid algorithm to obtain a square region and then searches its possible position set in the square region. Finally, the centroid of all possible positions is the estimated coordinate...
In recent years, wireless sensor networks (WSNs) have been widely used in many real-life scenarios, and have become more and more important. However, in some harsh environments, sensor nodes may suffer from a large scale damage that causes the network to get partitioned into multiple disjoint segments. How to connect these segments (in WSNs) is very important. In addition, the higher the connectivity...
Node localization is one of the most challenging issues in large scale sensor networks. Few bearing-only based methods are used to locate nodes in a large scale system. Existing bearing-only based Semidefinite Programming (BOSDP) method consumes a lot of energy and it may not yield good results if the beacons are placed randomly. Moreover, the BOSDP approach cannot estimate the locations and orientations...
In this paper, we present the results of the comparison of three reactive routing protocols for Wireless sensor networks (WSNs), AODV, DYMO and RPL. For the purpose of performance evaluation, detailed comparisons are made with AODV and DYMO. Simulations are run to estimate the network topology change, routing overhead and average packet End-to-End Delay. We simulate RPL with COOJA based on contiki...
Wireless communication technologies are used to collect information from sensitive, hostile and inaccessible environments. They are used in both military and civil applications that include environmental, medical, military and industrial fields. Routing data to a processing center or a base station requires mechanisms for energy conservation at the end of the prolonged lifetime of the network. The...
The use of sensor networks has increased rapidly over the last years. Due to their low resources, sensors come along with new issues regarding network security and energy consumption. Focusing on the network availability, previous studies proposed to protect the network against denial of service attacks with the use of traffic monitoring agents on some nodes. But if the control nodes go down or get...
This paper is concerned with distributed estimation of a scalar parameter using a wireless sensor network (WSN) that employs a large number of sensors operating under limited bandwidth resource. A semi-orthogonal multiple-access channel (MAC), which provides transmission of observations from K sensors to a fusion center (FC) via N (N ≤ N) orthogonal channels, is studied. The K sensors are divided...
Many applications of Wireless Sensor Networks (WSN) require to achieve the positions of the sensor nodes within a given time bound. In this paper we study the relative and physical localizability of WSN in a given time bound. We propose a new distributed and time bounded localization algorithm based on Multidimensional Scaling (MDS) method in WSN called D-MDS localization time algorithm. We compare...
Data collection by multiple sinks is a fundamental problem in wireless sensor networks. Existing work focused on designing optimal offline algorithms provided that the number and positions of sensors and sinks are predetermined. This may not be practical as, though sensors are cheap, sinks are quite expensive in reality. A more practical scenario is that sinks are deployed step by step during the...
This paper considers the cluster-head failure detection problem in WSNs and proposes a Cooperative cLuster-heAd failuRE deTection (CLARET) mechanism to accurately detect the failure status of a cluster head. The proposed CLARET mechanism allows the cluster head of a cluster to periodically broadcast a “heartbeat” message to all its members and each cluster member to independently detect the status...
Compressive Sensing (CS) has been applied successfully in a wide variety of applications in recent years, including photography, holography, optical system research, facial recognition, and Medical Resonance Imaging (MRI). In wireless sensor networks (WSNs), significant research work has been pursued to investigate the use of CS to reduce the amount of data communicated, particularly in data aggregation...
Wireless Sensor Networks (WSNs) often need to operate under strict requirements on energy consumption and be capable of self-adapting to the presence of non-trusted nodes which do not fully cooperate in the packet forwarding operation. In such an environment, the mechanism employed for the calculation of routing paths of minimum cost in terms of the number of transmissions executed for the reliable...
A channel-sharing method was proposed to improve the bandwidth and energy efficiency per detection task in wireless sensor network. The sensor nodes transmitted their log-likelihood ratios (LLR) to the fusion center in approximately descending order of the absolute value of their LLRs by modifying the value of backoff timer and frame interval according to the values of their LLRs. Simulation results...
Wireless sensor networks (WSNs) are used in many applications to gather sensitive information which is then forwarded to an analysis center. Resource limitations have to be taken into account when designing a WSN infrastructure. Authentication in WSNs is critical, as they are often deployed unattended in hostile environments and must transmit information over unsecured mediums. However, the cost of...
Wireless sensor network (WSN) is a typical application of Ad hoc network in autonomous system (AS). It has attracted considerable attention in the past. Recent years have witnessed a growing interest in the study of localization algorithm for WSN. Self-localization of nodes is one of the key technologies for application of WSN. The localization accuracy is a significant criterion to evaluate the practical...
This paper presents a simulation prototype design for wireless sensor networks (WSNs). It allows the performance evaluation (e.g., packet delivery rate, transmission latency and energy consumption) at high level, but with elaborate models of the hardware and software of sensor nodes. Many hardware components are modeled and the IEEE 802.15.4 standard is implemented. The prototype uses a clock based...
In this paper, we propose binary particle swarm optimization (BPSO) algorithm for distributed node localization in wireless sensor networks (WSNs). Each unknown node performs localization under the measurement of distances from three or more neighboring anchors. The node that gets localized during iteration will be used as a reference for remaining nodes. A comparison of the performances of PSO, basic...
In this paper, we propose a novel range-free localization algorithm tailored for heterogeneous wireless sensor networks (WSNs), where nodes have different transmission capabilities. Two different approaches are developed to accurately derive the expected hop progress (EHP). It is shown that the obtained EHP depends solely on the information locally available at each node and, hence, can be computed...
In this paper we present an advanced model for power consumption in communications. The new model for power consumed in communications takes into consideration parameters power consumption for the active mode, power consumption for the sleep mode, power consumption for the transient mode, transmission period, transient mode duration, sleep mode duration, and active mode duration. The new model for...
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