The impact of the access point power model on the energy-efficient management of infrastructured wireless LANs

2016 ◽  
Vol 94 ◽  
pp. 99-111 ◽  
Author(s):  
Rosario G. Garroppo ◽  
Gianfranco Nencioni ◽  
Gregorio Procissi ◽  
Luca Tavanti
Keyword(s):  
Energy Efficient ◽  
Wireless Lans ◽  
Access Point ◽  
Power Model ◽  
Efficient Management ◽  
The Impact

scholarly journals Energy Efficient Altitude Optimization of an Aerial Access Point

2020 ◽  
Author(s):  
Nithin Babu ◽  
Konstantinos Ntougias ◽  
Constantinos B. Papadias ◽  
Petar Popovski
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Optimization Technique ◽  
Access Point ◽  
Problem Formulation ◽  
Global Optimum ◽  
Base Station ◽  
Programming Technique ◽  
Aerial Vehicle ◽  
The Impact

In this paper, we propose an energy-efficient optimal<br>altitude for an aerial access point (AAP), which acts as a flying<br>base station to serve a set of ground user equipment (UE).<br>Since the ratio of total energy consumed by the aerial vehicle<br>to the communication energy is very large, we include the<br>aerial vehicle’s energy consumption in the problem formulation.<br>After considering the energy consumption model of the aerial<br>vehicle, our objective is translated into a non-convex optimization<br>problem of maximizing the global energy efficiency (GEE)<br>of the aerial communication system, subject to altitude and<br>minimum individual data rate constraints. At first, the nonconvex fractional objective function is solved by using sequential<br>convex programming (SCP) optimization technique. To compare<br>the result of SCP with the global optimum of the problem,<br>we reformulate the initial problem as a monotonic fractional<br>optimization problem (MFP) and solve it using the polyblock<br>outer approximation (PA) algorithm. Numerical results show that<br>the candidate solution obtained from SCP is the same as the<br>global optimum found using the monotonic fractional programming technique. Furthermore, the impact of the aerial vehicle’s<br>energy consumption on the optimal altitude determination is also<br>studied <br>

scholarly journals Energy Efficient Access Point Selection Method for IEEE802.11 Wireless LANs

2011 ◽  
Vol 11 (12) ◽  
pp. 578-585
Author(s):  
Ung Heo ◽  
Yu-Yang Peng ◽  
Kang-Soo You ◽  
Jae-Ho Choi
Keyword(s):  
Energy Efficient ◽  
Wireless Lans ◽  
Access Point ◽  
Selection Method ◽  
Point Selection ◽  
Efficient Access

scholarly journals Energy Efficient Altitude Optimization of an Aerial Access Point

2020 ◽  
Author(s):  
Nithin Babu ◽  
Konstantinos Ntougias ◽  
Constantinos B. Papadias ◽  
Petar Popovski
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Optimization Technique ◽  
Access Point ◽  
Problem Formulation ◽  
Global Optimum ◽  
Base Station ◽  
Programming Technique ◽  
Aerial Vehicle ◽  
The Impact

In this paper, we propose an energy-efficient optimal<br>altitude for an aerial access point (AAP), which acts as a flying<br>base station to serve a set of ground user equipment (UE).<br>Since the ratio of total energy consumed by the aerial vehicle<br>to the communication energy is very large, we include the<br>aerial vehicle’s energy consumption in the problem formulation.<br>After considering the energy consumption model of the aerial<br>vehicle, our objective is translated into a non-convex optimization<br>problem of maximizing the global energy efficiency (GEE)<br>of the aerial communication system, subject to altitude and<br>minimum individual data rate constraints. At first, the nonconvex fractional objective function is solved by using sequential<br>convex programming (SCP) optimization technique. To compare<br>the result of SCP with the global optimum of the problem,<br>we reformulate the initial problem as a monotonic fractional<br>optimization problem (MFP) and solve it using the polyblock<br>outer approximation (PA) algorithm. Numerical results show that<br>the candidate solution obtained from SCP is the same as the<br>global optimum found using the monotonic fractional programming technique. Furthermore, the impact of the aerial vehicle’s<br>energy consumption on the optimal altitude determination is also<br>studied <br>

МODERNIZATION TECHNOLOGY REPAIRING ACENTRIFUGAL WATER PUMP

2018 ◽  
pp. 48-51
Author(s):  
Sh.U. Yuldashev ◽  
D.T. Abdumuminova
Keyword(s):  
Production Process ◽  
Technological Process ◽  
Energy Efficient ◽  
Technical Support ◽  
Ultrasonic Processing ◽  
Water Pump ◽  
The Real ◽  
Technological Processes ◽  
Efficient Management ◽  
Pump Shaft

The article provides an overview of the principle of the pump D630-90, as well as methods for studying the real conditions of technical support to improve maintainability and optimize technological processes and systems. A technological process for the restoration of the shaft of a centrifugal water pump has been developed and an algorithm for managing it has been proposed, on the basis of which the system for energy-efficient management of the recovery area has been implemented. Also in the article some questions of use, metal-filled compound SK812, and also application of ultrasonic processing of a surface of a shaft of the centrifugal water pump of mark D630-90 are mentioned and considered. The developed technological process of pump shaft restoration showed that it is characterized by simplicity, it fits well into the production process of repair and can be widely used in repair shops.

An Energy Efficient Spectrum Aware Routing for Cognitive Radio Networks (CRNs)

2020 ◽  
Vol 10 ◽  
Author(s):  
Dileep Reddy Bolla ◽  
Jijesh J J ◽  
Mahaveer Penna ◽  
Shiva Shankar
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Cognitive Radio Networks ◽  
Energy Efficient ◽  
Research Work ◽  
Spectrum Management ◽  
Residual Energy ◽  
Radio Networks ◽  
Traffic Load ◽  
The Impact

Back Ground/ Aims:: Now-a-days in the Wireless Communications some of the spectrum bands are underutilized or unutilized; the spectrum can be utilized properly by using the Cognitive Radio Techniques using the Spectrum Sensing mechanisms. Objectives:: The prime objective of the research work carried out is to achieve the energy efficiency and to use the spectrum effectively by using the spectrum management concept and achieve better throughput, end to end delay etc., Methods:: The detection of the spectrum hole plays a vital role in the routing of Cognitive Radio Networks (CRNs). While detecting the spectrum holes and the routing, sensing is impacted by the hidden node issues and exposed node issues. The impact of sensing is improved by incorporating the Cooperative Spectrum Sensing (CSS) techniques. Along with these issues the spectrum resources changes time to time in the routing. Results:: All the issues are addressed with An Energy Efficient Spectrum aware Routing (EESR) protocol which improves the timeslot and the routing schemes. The overall network life time is improved with the aid of residual energy concepts and the overall network performance is improved. Conclusion:: The proposed protocol (EESR) is an integrated system with spectrum management and the routing is successfully established to communication in the network and further traffic load is observed to be balanced in the protocol based on the residual energy in a node and further it improves the Network Lifetime of the Overall Network and the Individual CR user, along with this the performance of the proposed protocol outperforms the conventional state of art routing protocols.

scholarly journals Energy-Efficient Packet Forwarding Scheme Based on Fuzzy Decision-Making in Underwater Sensor Networks

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4368
Author(s):  
Jitander Kumar Pabani ◽  
Miguel-Ángel Luque-Nieto ◽  
Waheeduddin Hyder ◽  
Pablo Otero
Keyword(s):  
Energy Consumption ◽  
Sensor Networks ◽  
Energy Efficient ◽  
Real Life ◽  
Base Station ◽  
Fuzzy Decision Making ◽  
Underwater Sensor Networks ◽  
Packet Forwarding ◽  
Node Number ◽  
The Impact

Underwater Wireless Sensor Networks (UWSNs) are subjected to a multitude of real-life challenges. Maintaining adequate power consumption is one of the critical ones, for obvious reasons. This includes proper energy consumption due to nodes close to and far from the sink node (gateway), which affect the overall energy efficiency of the system. These wireless sensors gather and route the data to the onshore base station through the gateway at the sea surface. However, finding an optimum and efficient path from the source node to the gateway is a challenging task. The common reasons for the loss of energy in existing routing protocols for underwater are (1) a node shut down due to battery drainage, (2) packet loss or packet collision which causes re-transmission and hence affects the performance of the system, and (3) inappropriate selection of sensor node for forwarding data. To address these issues, an energy efficient packet forwarding scheme using fuzzy logic is proposed in this work. The proposed protocol uses three metrics: number of hops to reach the gateway node, number of neighbors (in the transmission range of a node) and the distance (or its equivalent received signal strength indicator, RSSI) in a 3D UWSN architecture. In addition, the performance of the system is also tested with adaptive and non-adaptive transmission ranges and scalable number of nodes to see the impact on energy consumption and number of hops. Simulation results show that the proposed protocol performs better than other existing techniques or in terms of parameters used in this scheme.

scholarly journals Renovation of Public Lighting Systems in Cultural Landscapes: Lighting and Energy Performance and Their Impact on Nightscapes

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 509
Author(s):  
Lodovica Valetti ◽  
Francesca Floris ◽  
Anna Pellegrino
Keyword(s):  
Energy Efficient ◽  
Flux Distribution ◽  
Cultural Landscapes ◽  
Energy Performance ◽  
Luminous Flux ◽  
Landscape Value ◽  
Reduce Energy Consumption ◽  
Lighting Systems ◽  
The Impact ◽  
Positive Effect

The technological innovation in the field of lighting and the need to reduce energy consumption connected to public lighting are leading many municipalities to undertake the renewal of public lighting systems, by replacing the existing luminaires with LED technologies. This renovation process is usually aimed at increasing energy efficiency and reducing maintenance costs, whist improving the lighting performance. To achieve these results, the new luminaires are often characterised by a luminous flux distribution much more downward oriented, which may remarkably influence and alter the perception of the night image of the sites. In this study the implications of the renovation of public lighting systems in terms of lighting and energy performance as well as the effects relating to the alteration of the night image, in historical contexts characterized by significant landscape value, are analysed. Results, along with demonstrating the positive effect that more sustainable and energy efficient lighting systems may have on the lighting performance and energy consumptions of public lighting systems, evidences the impact they may have on the alteration of the nocturnal image.

Mobility aware of WDM-based CMO OFDM communication system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Saad M. Hardan ◽  
Ayad A. Abdulkafi ◽  
Saadi Hamad Thalij ◽  
Sherine S. Jumaah
Keyword(s):  
Wavelength Division Multiplexing ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Light Emitting Diode ◽  
Access Point ◽  
Mobile Users ◽  
Visible Light Communications ◽  
Optical Wireless Communications ◽  
High Data ◽  
The Impact

Abstract The continued increase in several mobile applications forces to replace existing limited spectrum indoor radio frequency wireless connections with high-speed ones. Visible light communications (VLC) technology has gained prominence in the development of high data rate transmission for fifth-generation networks. In optical wireless communications, light-emitting diode (LED) transmitters are used in applications that desire mobility as LED divergence enables larger coverage. Since each VLC access point covers a small area, handovers of mobile users are inevitable. Wavelength division multiplexing (WDM) can be used in VLC systems to tackle the above issue and to meet the increasing demand for indoor connectivity with high bit rates. In this paper, a new system architecture for WDM with coded modulated optical in orthogonal frequency division multiplexing (OFDM) VLC system in conjunction with red, green, blue, and yellow (RGBY) LEDs is proposed to reduce the impact of random receiver orientation of indoor mobile users over VLC downlink channels and improves the system’s bit-error-rate (BER) performance. Simulation results show that the proposed method is not affected by the user’s mobility and hence it performs better than other approaches, in terms of BER for all scenarios and at all positions. This study reveals that using WDM-OFDM-VLC with RGBY LEDs to construct a VLC system is very promising.

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