3,334 research outputs found
Location Aided Energy Balancing Strategy in Green Cellular Networks
Most cellular network communication strategies are focused on data traffic
scenarios rather than energy balance and efficient utilization. Thus mobile
users in hot cells may suffer from low throughput due to energy loading
imbalance problem. In state of art cellular network technologies, relay
stations extend cell coverage and enhance signal strength for mobile users.
However, busy traffic makes the relay stations in hot area run out of energy
quickly. In this paper, we propose an energy balancing strategy in which the
mobile nodes are able to dynamically select and hand over to the relay station
with the highest potential energy capacity to resume communication. Key to the
strategy is that each relay station merely maintains two parameters that
contains the trend of its previous energy consumption and then predicts its
future quantity of energy, which is defined as the relay station potential
energy capacity. Then each mobile node can select the relay station with the
highest potential energy capacity. Simulations demonstrate that our approach
significantly increase the aggregate throughput and the average life time of
relay stations in cellular network environment.Comment: 6 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1108.5493 by other author
Observing and Improving the Reliability of Internet Last-mile Links
People rely on having persistent Internet connectivity from their homes and
mobile devices. However, unlike links in the core of the Internet, the links
that connect people's homes and mobile devices, known as "last-mile" links, are
not redundant. As a result, the reliability of any given link is of paramount
concern: when last-mile links fail, people can be completely disconnected from
the Internet.
In addition to lacking redundancy, Internet last-mile links are vulnerable to
failure. Such links can fail because the cables and equipment that make up
last-mile links are exposed to the elements; for example, weather can cause
tree limbs to fall on overhead cables, and flooding can destroy underground
equipment. They can also fail, eventually, because cellular last-mile links can
drain a smartphone's battery if an application tries to communicate when signal
strength is weak.
In this dissertation, I defend the following thesis: By building on existing
infrastructure, it is possible to (1) observe the reliability of Internet
last-mile links across different weather conditions and link types; (2) improve
the energy efficiency of cellular Internet last-mile links; and (3) provide an
incrementally deployable, energy-efficient Internet last-mile downlink that is
highly resilient to weather-related failures. I defend this thesis by
designing, implementing, and evaluating systems
Recent Advances in Internet of Things Solutions for Early Warning Systems: A Review
none5noNatural disasters cause enormous damage and losses every year, both economic and in terms of human lives. It is essential to develop systems to predict disasters and to generate and disseminate timely warnings. Recently, technologies such as the Internet of Things solutions have been integrated into alert systems to provide an effective method to gather environmental data and produce alerts. This work reviews the literature regarding Internet of Things solutions in the field of Early Warning for different natural disasters: floods, earthquakes, tsunamis, and landslides. The aim of the paper is to describe the adopted IoT architectures, define the constraints and the requirements of an Early Warning system, and systematically determine which are the most used solutions in the four use cases examined. This review also highlights the main gaps in literature and provides suggestions to satisfy the requirements for each use case based on the articles and solutions reviewed, particularly stressing the advantages of integrating a Fog/Edge layer in the developed IoT architectures.openEsposito M.; Palma L.; Belli A.; Sabbatini L.; Pierleoni P.Esposito, M.; Palma, L.; Belli, A.; Sabbatini, L.; Pierleoni, P
IEEE Access Special Section Editorial: Green Communications on Wireless Networks
Green communications, focusing on energy efficiency, is a hot topic in both academic and industry communities since they can significantly improve sustainability concerning power resources and environmental conditions. Later, with much focus on this area, several green communication methods started enrolling into a more thoughtful phase, with compelling applications in several networks. For instance, a simple and effective green communication solution is to arrange a sleep mode device incorporated by several MAC protocols with broad wireless network applications. However, it is required to examine the trade-off between green communications' energy efficiency and network requirements. In addition, it is crucial to appraise the performance concerning the energy consumption, the throughput, and the response time, regarding green communications under different wireless network conditions (e.g., different traffic and different channels)
Adaptive search in mobile peer-to-peer databases
Information is stored in a plurality of mobile peers. The peers communicate in a peer to peer fashion, using a short-range wireless network. Occasionally, a peer initiates a search for information in the peer to peer network by issuing a query. Queries and pieces of information, called reports, are transmitted among peers that are within a transmission range. For each search additional peers are utilized, wherein these additional peers search and relay information on behalf of the originator of the search
Aerospace medicine and biology: A continuing bibliography with indexes, supplement 197, September 1979
This bibliography lists 193 reports, articles, and other documents introduced into the NASA scientific and technical information system in August 1979
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