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Denial of Sleeping is a novel type of potential attacks in wireless network. The object of the attack is a sensor node’s power supply. To make sensors inexpensive so that they can be economically deployed in large numbers, they generally have very limited battery capability. Thus, a lifetime of a sensor is degraded under Denial of Sleeping attack. In this paper a mathematical model for performance...
Broadcast plays an important role and is widely used in Wireless Sensor Networks (WSNs). Several problems of the broadcast have been intensively addressed in the literature, such as minimizing energy consumption and minimizing broadcast latency. The existing broadcast schedules show that there is a trade off between the energy consumption and the broadcast latency. Finding a broadcast schedule minimizing...
Message broadcasting is an essential and widely-used operation in multi-hop Wireless Sensor Networks (WSNs). Minimum latency broadcast scheduling (MLBS) aims to achieve a schedule to broadcast messages with a minimum latency. In duty-cycle networks, a node alternates between active and sleep states, which causes decrease in energy consumption at the cost of increased broadcast latency. An existing...
In this paper, we propose an energy-efficient adaptive location middleware based on GPS as well as embedded sensors including an accelerometer and a geomagnetic sensor for smart mobiles. Smart mobiles provide Network-based or GPS-based locations for various applications. Network-based location does not have high accuracy but its level of energy consumption is low. In contrast, GPS-based location has...
Data aggregation is a fundamental problem in wireless sensor networks that has attracted great attention in recent years. To design a data aggregation scheme, delay and energy efficiencies are two crucial issues that require much consideration. In this paper, we propose a distributed, energy-efficient algorithm for collecting data from all sensor nodes with minimum latency called Delay-minimized Energy-efficient...
Greedy forwarding fails due to void area, termed a hole, where no nodes can be deployed in realistic wireless sensor networks. This is known as the local minimum problem. Several schemes have been recently proposed to solve this problem. However, they have the problem that nodes, which are adjacent to the hole, have to maintain hole boundary information and an increase in hop counts due to additional...
In wireless sensor networks, density control is a promising approach that has a considerable impact on extending the network lifetime. To optimize the energy utilization, the sensors in active mode adjust their sensing ranges to fulfill two conflicting objectives, minimizing the overlapping sensing area of the sensors and at the same time maintaining a high degree of coverage. In this paper, we consider...
Data forwarding schemes that use a single ACK-based retransmission mechanism are widely used to increase the packet delivery ratio in wireless sensor networks. However, these schemes may waste a considerable amount of energy for data transmissions, especially when the link quality is low for ACK transmissions. In this paper, we propose a novel multi-ACK-based data forwarding scheme to minimize the...
Greedy forwarding is the main component of geographic routing in wireless sensor networks (WSNs). As it uses 1-hop local information for packet forwarding, it does not need to maintain routing table, having low overhead and high scalability. Early proposed greedy forwarding schemes do not consider link quality, so the schemes experience performance degradation from unreliability of links in real environment...
In wireless sensor networks, density control is an important technique for prolonging a network's lifetime. To reduce the overall energy consumption, it is desirable to minimize the overlapping sensing area of sensor nodes. In this paper, we study the problem of energy-efficient area coverage by the regular placement of sensors with adjustable sensing and communication ranges. We suggest a more accurate...
Applications in wireless sensor networks (WSNs) experience the energy hole problem, i.e., nodes closer to the base station drain their energy much faster than nodes that are far from the base station; accordingly, the network lifetime is reduced. Recently, Medidi and Zhou have proposed a DDC approach to address the energy hole problem by assigning different duty cycles for nodes in different coronas...
One of the major challenges of designing a dissemination protocol for wireless sensor networks (WSNs) is energy efficiency. Flooding and SPIN, which are very well-known proactive methods, spontaneously disseminate the sensed data without a request from an arbitrary sink node. However, these proactive protocols disseminate the data even to some nodes that do not need it, which is energy inefficient...
In wireless sensor networks, much research has focused on improving energy consumption and network lifetime due to limited power available on sensor nodes. The imbalance of node energy consumption results in the network partition blocking data transmission from sources to sinks. This paper proposes an efficient node deployment control protocol to achieve balanced energy consumption among sensor nodes...
Energy conservation is critical in wireless sensor networks. Conventionally, energy consumption is represented by 1/dalpha, when d is the distance between a TX and a RX, and alpha is the path-loss (generally between 2 and 4 for indoor environments). Such a correlation between the energy consumption of sensor node and the distance between a transmitter and a receiver allows a researcher to develop...
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