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Energy conservation has been known as the most important issue for many applications in wireless sensor networks (WSNs). For data gathering in a clustered sensor network, most existing work focuses on fusing data at cluster heads (CHs). However, in target tracking applications, these approaches do not consider that one target is usually detected by sensor nodes in multiple clusters, which leads to...
Safety function response time is a metric for safety-critical automation systems defined in the IEC 61784-3-3 standard for single input and single output systems communicating over wired technologies. We propose a model to estimate the safety function response time for a multiple input and multiple output feedback control loop system communicating wirelessly over one of the modes defined in the IEEE...
IEEE 802.15.4 Medium Access Control (MAC) layer does not include the Request-To-Send/Clear-To-Send (RTS/CTS) handshake mechanism, in order to overcome the hidden node problem that affects Wireless Sensor Networks (WSNs). In this paper we propose and analyse the use of RTS/CTS in IEEE 802.15.4 for the nonbeacon-enable mode. The proposed solution shows that by considering the RTS/CTS mechanism combined...
Quality of service metrics is one of the vital concerns in wireless sensor network, which is improved by hierarchical clustering algorithms. In this paper discussion of EEICCP (Energy Efficient Inter Cluster Co-ordination Protocol) which adopted a layered approach for the clusters and communication among the clusters through cluster heads and cluster coordinators is prepared. We investigate the impact...
To solve the problems of control channel bottleneck and communication delay in multi-radio wireless sensor networks, this paper designs an asynchronous MAC protocol named UMD2-MAC in which a union mechanism of prime channel hopping(PCH for short) and control-channel reservation is used. The channel hopping makes sure that the average delay of selecting the same channel is small while the reservation...
Various control applications such as aerospace vehicles and automotive control systems can benefit from lower weight and cost. Replacing wired feedback control with wireless sensor and actuator networks (WiSAN) offers attractive features by improving upon the weight and cost problems, while posing new challenges due to the delayed noisy feedback links. Addressing these challenges requires modeling...
In this paper, we study the delay performance of backpressure routing algorithms using LIFO schedulers (LIFO-backpressure). We uncover a surprising behavior in which, under certain channel conditions, the average delay of packets decreases as the traffic load in the network increases. We propose and analyze a queueing-theoretic model under which the scheduler can transmit packets only if the queue...
Wireless sensor networks (WSNs) have received a lot of attention recently due to their enormous potential in different applications. As in all distributed systems, time synchronization is very important in a sensor network since the design of many protocols and implementation of applications require precise time. In this article, we first gave some basic background knowledge about time synchronization...
Currently the main approach used to save power within WSN's is to employ reactive MAC schemes that detect when the network is becoming busy and adapt to provide an increase in available bandwidth. Once the traffic becomes lighter the available bandwidth is reduced to save power. While this works well with bursty sporadic traffic, there is a clear trade-off between latency of response and power savings...
IEEE 802.15.4 is a communication standard specifically designed targeting low power personal area networks. It provides MAC and Physical layer specifications for resource constrained networks like Wireless Sensor Networks(WSN). IEEE 802.15.4 MAC specification targets fairness as one of the design considerations. That creates a problem when IEEE 802.15.4 MAC is used for event driven WSN applications...
It is well known that periodically putting nodes into sleep can effectively save energy in wireless sensor networks, at the cost of increased communication delays. However, most existing work mainly focuses on static sleep scheduling, which cannot guarantee the desired delay when the network conditions change dynamically. In many applications with user-specified end-to-end delay requirements, the...
This paper firstly introduces the compressed sensing theory that is very hot in recent research. Our research combines the compressed sensing with wireless sensor network to improve the prior classical formulas due to the great advantage of capabilities of compressing data in large scale wireless network. When the transmission data decrease sharply, the throughput increases obviously in our research...
This paper introduces new methods for sensor fusion in homogenous sensor networks in the presence of the communication time delay. It allows the sensor nodes to solve consensus problems despite the network induced delay. It is shown that such approaches guarantee tracking of each consensus filter output to the original value of the measured signal in both regular and non-regular network graph topology...
We target an interesting problem of simultaneous optimization of lifetime and source-to-sink delay in wireless sensor networks, and present a fuzzy multiobjective online routing algorithm. For a routing request, the proposed routing algorithm finds a path that offers a good balance between the two routing objectives, namely maximizing the network lifetime and minimizing the source-to-sink delay. Fuzzy...
In wireless sensor networks (WSNs), data aggregation schemes have been extensively investigated in order to reduce energy, although it has a great side-effect, the end to end delay is increased. This paper proposes a layered clustering structure for data aggregation in wireless sensor networks. In this proposed structure, each layer of clusters has specific delay and accuracy in order to aggregate...
The design of sensor networks capable of reaching a consensus on a globally optimal decision test, without the need for a fusion center, is a problem that has received considerable attention in the last years. Many consensus algorithms have been proposed, with convergence conditions depending on the graph describing the interaction among the nodes. In most works, the graph is undirected and there...
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