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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...
Mobile Health (mHealth) systems leverage wireless and mobile communication technologies to provide healthcare stakeholders with innovative tools and solutions that can revolutionize healthcare provisioning. Body Area Sensor Networks (BASNs) is part of the mHealth system that focuses on the acquisition by a group of biomedical sensors of vital signals. However, the design and operation of BASNs are...
In the process of design of protocols for medium access control in wireless sensor networks, it is necessary to find a compromise between energy saving, time sensitivity, scalability, adaptability and complexity. In this research, as an object of optimization S-MAC protocol is chosen. The main advantage of the S-MAC protocol is a state of sleep, which significantly reduces power consumption. Although...
With recent advances in energy harvesting technology, practical wireless nano-sensor networks (WNSNs) are coming within reach. An important aspect of these WNSNs is that the charge time is significantly longer than each sensor mote can reliably transmit its data-leading to sparse transmission requests in the time-domain. In this paper, we propose a compressed sensing-based approach for efficient request...
Optimization of flows to maximize Wireless Sensor Network (WSN) lifetime is a problem already investigated in various aspects. However, most studies ignored the effects of finite bandwidth. As source data rate of sensor nodes increases, flow patterns that balance energy dissipation optimally might need more bandwidth than available. As a result, ignoring bandwidth limitations may lead to infeasible...
The popularity of wireless local area networks has led to a dramatic increase in the density of access points, especially in urban areas. These access points are individually owned, placed, and power-tuned for their local users and are generally oblivious to others. On the other hand, the abundance of access points that mostly share the same upstream provider, offers opportunities for optimization...
Wireless sensor networks (WSN) consist of a huge number of low-power, short-lived and unreliable sensors. Sensor nodes are battery - powered devices, and have higher energy consumption and network life time for transmitting of data frequently. The aim of the paper is to increase the life time, reduce end to end delay and high reliability with maximum performance of WSN. Most of the existing scheduling...
Wireless Sensor Network (WSN) is one of the emerging technological fields due to recent advancements and area of research. The WSN is collection small sensor nodes, which are battery driven and have very less power. Recent research area of WSN focuses on energy consumption, routing, QoS, bandwidth, packet loss etc. This paper focuses on comparative analysis among various existing routing protocols...
In a low time to live based wireless network, the node drops all its energy before actually transferring the data given to it. This serves as a drawback where the data is not transferred completely resulting in bandwidth wastage and improper message delivery. To address this problem we formulate new routing techniques by which the data from one part is scheduled to reach the destination based on the...
Underwater wireless sensor network (UWSN) is an important emerging research area in wide range of application, unlike the terrestrial network it uses the acoustic signal which has a unique characteristics like limited bandwidth, high and variable propagation delay, transmit energy, minimum network lifetime and so on. This paper proposes an efficient clustering algorithm having 3D-GRID network architecture...
Expeditiously escalating need for the wireless communication puts forward the challenge of efficient spectrum utilization. The cognitive networks paradigm gives a tremendous provision to considerably influence and shift the implementation of underwater acoustic networks for an efficient utilization of acoustic spectrum. The capacity of underwater acoustic communication is intrinsically constrained...
Heterogeneous wireless sensor network (HWSN) consists of sensor nodes with different ability, such as computing power and sensing range. Compared with homogeneous wireless sensor network, the design of protocols for such networks has to be more complex due to the energy constraint in order to prolong the lifetime of the network. As energy consumption mostly comes from the radio transmissions, bandwidth...
The dissemination of information in wireless networks is a fundamental aspect in several network processes, such as routing, monitoring and management. Nowadays, most of the techniques for dissemination of management information adopt controlled flooding approaches, which usually impairs the network performance. In this sense, the optimization of the dissemination of management information for dense...
Limited bandwidth capacity and battery power are the unique characters of Underwater Sensor Networks (UWSNs). First this study introduces a competition scheme based on delay time. This scheme provides a selection method of relay nodes considering the limited bandwidth capacity. Then a heterogeneous nodes distribution strategy is proposed to balance the energy consumption of the whole UWSN. The ratio...
Interesting wireless networking scenarios exist wherein network services must be guaranteed in a dynamic fashion for some priority users. For example, in disaster recovery, members need to be able to quickly block other users in order to gain sole use of the radio channel. As it is not always feasible to physically switch off other users, we propose a new approach, termed selective packet destruction...
In IEEE 802.15.4 beacon-enabled mode, the personal area network (PAN) coordinator can assign guaranteed time slot (GTS) to allocate a particular duration for requested devices. The main challenge in GTS mechanism is how the PAN coordinator allocates time slot duration for the devices which request GTS. However, if the allocated devices use GTS slot partially or the traffic pattern is not suitable,...
Motivated by applications of wireless sensor networks to seismic field monitoring, we propose a method that integrates in-situ lightweight temporal compression with random access communication and compressive sensing for recovery of spatially-sparse phenomena. This method of spatio-temporal compression offers savings in terms of energy consumption and bandwidth usage, does not require sensors to be...
Ant colony optimization algorithm is widely used in various NPC problems for the global optimization, self learning ability and other characteristics, and achievements were made in WSNs field. Based on the study of Ant colony algorithm, in this paper, we propose a new energy-effective QoS routing algorithm. The algorithm is to speeds up the convergence of ant colony algorithm by using SNGF to optimize...
This paper considers the problem of quantization schemes for source localization in wireless sensor networks. First, a channel-aware adaptive quantization scheme for target location estimation is proposed and local sensor nodes dynamically adjust their quantization thresholds according to a kind of position-based information sequences. The scheme incorporates the statistics of imperfect wireless channels...
Telecom service providers are increasingly looking to additional sources of revenue in order to cover the network infrastructure costs associated with the bandwidth explosion. One mechanism that has attracted attention is known as “sponsored content” and allows for content providers to sponsor their content and thereby make it free for end users. In this paper we examine some of the implementation...
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