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A challenging issue in data collection in duty-cycled wireless sensor networks (DC-WSNs) is the trade-off between lifetime and latency. Indeed, duty-cycling has long been a critical mechanism for energy conservation in WSNs where the sensor nodes switch between active and dormant states. Moreover, this mechanism involves strong sleep latencies leading to severe end-to-end delay degradation. In this...
Wireless sensor network is a collection of a group of sensors connected to monitor an area of interest. Installation flexibility, mobility, reduced cost and scalability have given popularity to wireless sensor networks. Opportunistic routing is a routing protocol that takes the advantage of broadcasting nature of wireless sensor network for multi-hop communication. Considering the importance of communication...
In this paper, a novel adaptive TDMA-based clustering for critical event detection in Wireless Sensor Networks (WSN) is proposed. The aim of our adaptive approach is to detect the critical event, such a fire detection in the forest, at the required delay with minimum energy consumption. So, when an event occurs, only the sensor nodes in the detection area will be in active mode, while the others will...
Several localization techniques have been proposed to identify the exact location of sensor nodes. Localization is important for computation of many applications such as routing in wireless sensor network. Energy preservation is a challenge in wireless sensor network and many algorithms have already been proposed. The localized node lifetime is maximized by using energy-efficient routing, use of minimum...
Wireless sensor and actor networks require efficient coordination mechanisms to perform reliable actions in the physical world. In this paper, an energy and delay aware three-level coordination mechanism is proposed for wireless sensor and actor networks using twolevel hierarchical k-hop clustering algorithm. An optimal number of actors are calculated based on the network area and number of sensors...
There have been several geographic routing protocols proposed for disseminating data in Wireless Sensor Networks. In these protocols, routing is based on the location of neighboring nodes and the selection of the next hop is done based on a direction based or a location based strategy. In this paper, a novel routing protocol that makes use of this direction based strategy to disseminate data in the...
Rapid technological advances and innovations in the area of autonomous systems push the researchers towards autonomous networked systems with emphasis on Wireless Sensor Networks (WSNs). In WSN event-driven applications, it is critical to report the detected events in the area, resulting in sudden bursts of traffic due to occurrence of spatially-correlated or multiple events, causing loss of data...
Public sensing is an application in which sensory systems embedded in smart devices, vehicles, residential and public spaces form a collective cloud of data sources from which multi-owned access points realize end-users' service requests. This conception can be further extended under the umbrella of integrated RFID-Sensor Networks (RSNs) to include RFID systems. Such a configuration is heterogeneous...
We present Duo-MAC, an asynchronous cascading wake-up scheduled MAC protocol for heterogeneous traffic forwarding in low-power wireless networks. Duo-MAC deals with energy-delay minimization problem and copes with transmission latency encountered by Today's duty-cycled protocols when forwarding heterogeneous traffic types. It switches, according to the energy and delay requirements, between Low Duty...
One of key attributes of WBAN is to extend the network lifetime, which can be achieved by adjusting the wakeup and sleep modes of the sensor nodes. Traditional low-power methods such as channel polling and periodic duty cycling are unable to satisfy WBANs requirements due to idle listening, collision, and control packet overhead problems. In this paper, we propose an RFID-enabled MAC protocol (RMAC)...
Certain Wireless Sensor Network (WSN) applications such as patient monitoring, smart grid, and equipment condition monitoring require accurate estimation of specific WSN parameters such as end-to-end delay, reliability and power consumption. The estimation of these parameters calls for an accurate and lightweight WSN model that is suitable for the low processing capabilities of sensor nodes. In this...
Receiver-based MAC (RB-MAC) is a preamble-sampling MAC protocol for WSNs in which a receiver node is dynamically elected, among potential neighbors of the sender node, based on current channel conditions. In this paper, we evaluate the performance of RB-MAC and compare it with a sender-based preamble-sampling MAC protocol by using analytical methods, and implementation in real sensor nodes. We have...
With rapid development of microelectronics and low-cost cost multimedia hardware, Wireless Sensor Networks (WSNs) have started to evolve into Wireless Multimedia Sensor Networks (WMSNs), where the emphasis is given on acquisition, processing and transmission of multimedia content through WSN. While the idea of multimedia sensor networks has been existing for some time, very little research is performed...
Wireless sensor networks (WSNs) are gaining more interest in variety of applications. Of their different characteristics and challenges, network lifetime and efficiency are the most considered issues in WSN-based systems. The scarcest WSN's resource is energy, and one of the most energy-expensive operations is route discovery and data transmission. This paper presents a novel design of a cooperative...
Due to increase in Vt (threshold voltage) variation caused by global and local process variations in ultrashort-channel devices, CMOS-based 6T SRAM cell and its variants cannot be operated at voltage lower than 600 mV. Therefore, this paper presents a FinFET-based 8T SRAM cell to mitigate impact of process variation. In this work, various design metrics are assessed and compared with MOSFET-based...
The development of generic wireless channel simulator is proposed in this work. This simulator is based on the time-scale domain generalized eigenstructure for all wireless propagation channels and developed in LabVIEW®. It is envisaged that such simulator will be able to serve as all-in-one system for the evaluation of the channel characteristics and transceiver performance for almost all contemporary...
We propose a novel heuristic algorithm that performs geographical routing based on a greedy approach. Our proposed scheme first allocates the geographic locations of the source and the destination nodes influenced by their GPS information. A virtual Euclidean path is considered as a reference line to choose appropriate node for routing. Then, a multi-hop technique is adopted to establish routing path...
Data aggregation from a set of sensors to a common sink over a tree-based routing topology is a fundamental traffic pattern in wireless sensor networks (WSNs). The time division multiple access (TDMA)-based scheduling protocols are suitable for such data aggregation applications. Most of the previously proposed TDMA schemes focus on a particular objective, such as minimizing schedule delay, latency,...
This paper studies minimum-energy packet forwarding policies for communicating sensor measurements from plant to controller over an unreliable multi-hop wireless network so as to guarantee that the optimal controller achieves a prespecified closed-loop performance. For fixed sampling interval, we demonstrate that the minimal linear-quadratic control loss is monotonically decreasing in the reliability...
Beaconless geo-routing protocols have been traditionally analyzed assuming equal communication ranges for the data and control packets. This is not true in reality, since the communication range is in practice function of the packet length. As a consequence, a substantial discrepancy may exist between analytical and empirical results offered in beaconless geo-routing literature. Furthermore, performance...
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