scholarly journals Design and implementation of resource allocation protocols in wireless networks, utilizing testbed experimentation platforms

2014 ◽  
Author(s):  
Απόστολος Αποστολάρας
Keyword(s):  
Resource Allocation ◽  
Mesh Networks ◽  
Focal Point ◽  
Profit Sharing ◽  
User Equipment ◽  
Information Storage ◽  
Mesh Network ◽  
Added Value ◽  
Sharing Rule ◽  
Trade Offs

Particularly for the cooperative scheduling problem, a novel communication architectureis proposed which considers the exploitation of intermediate relays.Relays are employed for forwarding information to the final destination whennetworking conditions do not benefit the direct transmissions from source todestination. Our architecture improves drastically networking performance byincorporating advanced mechanisms from optimization theory. As a result, sophisticatedscheduling and resource allocation techniques for unicast and multicastscenarios are activated so that a wireless network to attain desired powerperformance vs. networking delay trade-offs. A primitive design of our architectureis the ability offered to operators to fine-tune and balance the networkoperation through a control knob that achieves power savings with an inducedcost in the networking delay. The above design feature is enabled by effectivelyexploiting information storage capabilities and power efficient scheduling. Finally,testbed experimentation conducted in NITOS testbed has revealed a significantreduction in the transmission power with the use of our cooperativearchitecture. Moreover, we identify ways to incorporate the same architectureprinciples in LTE-A cellular networks. To this end, we assume wireless meshnetworking by evolving the user equipment to act as a relay in a 3GPP LTE-Asystem. Thus, interconnecting two eNBs with mobile user equipment. Wirelessmesh networking in LTE networks has recently become a focal point of interestin the emerging scenarios for 5G technology. We propose specific scenarioswhere this architecture can be effectively applied and illustrate the correspondingresults from the experimentation that was conducted in the OpenAirInterface For the data offloading problem, we study a framework for toggling LTE-A cellularmobile users to WiFi mesh networks. Mobile network operators can leasethese mesh networks to offload their traffic and reduce their servicing cost. Inthis context, we determine the most-costly users to the cellular network andwe design a routing policy that the mesh network can employ so as to servethe offloaded traffic with the minimum possible cost. Moreover, the reimbursementoffered by the operator should be dispensed to the different mesh users,according to their contribution and added-value significance. We address thisissue by employing the Shapley value profit sharing rule, which ensures theparticipation of the mesh nodes in this joint task.

scholarly journals Hybrid Evolutionary Approaches to Maximum Lifetime Routing and Energy Efficiency in Sensor Mesh Networks

2015 ◽  
Vol 23 (3) ◽  
pp. 481-507 ◽  
Author(s):  
Alma A. M. Rahat ◽  
Richard M. Everson ◽  
Jonathan E. Fieldsend
Keyword(s):  
Mesh Networks ◽  
Search Space ◽  
Base Station ◽  
Linear Program ◽  
Mesh Network ◽  
Average Lifetime ◽  
Maximum Lifetime ◽  
Routing Strategy ◽  
Trade Offs ◽  
Network Topologies

Mesh network topologies are becoming increasingly popular in battery-powered wireless sensor networks, primarily because of the extension of network range. However, multihop mesh networks suffer from higher energy costs, and the routing strategy employed directly affects the lifetime of nodes with limited energy resources. Hence when planning routes there are trade-offs to be considered between individual and system-wide battery lifetimes. We present a multiobjective routing optimisation approach using hybrid evolutionary algorithms to approximate the optimal trade-off between the minimum lifetime and the average lifetime of nodes in the network. In order to accomplish this combinatorial optimisation rapidly, our approach prunes the search space using k-shortest path pruning and a graph reduction method that finds candidate routes promoting long minimum lifetimes. When arbitrarily many routes from a node to the base station are permitted, optimal routes may be found as the solution to a well-known linear program. We present an evolutionary algorithm that finds good routes when each node is allowed only a small number of paths to the base station. On a real network deployed in the Victoria & Albert Museum, London, these solutions, using only three paths per node, are able to achieve minimum lifetimes of over 99% of the optimum linear program solution’s time to first sensor battery failure.

COORDINATED DISTRIBUTED SCHEDULING IN WIRELESS MESH NETWORK

2012 ◽  
Vol 3 (3) ◽  
pp. 368-374
Author(s):  
Usha Kumari ◽  
Udai Shankar
Keyword(s):  
Network Performance ◽  
Mesh Networks ◽  
Mac Protocol ◽  
Scheduling Algorithm ◽  
Ieee 802.16 ◽  
Distributed Scheduling ◽  
Mesh Network ◽  
Fourth Generation ◽  
Network Nodes ◽  
Wireless Mesh

IEEE 802.16 based wireless mesh networks (WMNs) are a promising broadband access solution to support flexibility, cost effectiveness and fast deployment of the fourth generation infrastructure based wireless networks. Reducing the time for channel establishment is critical for low latency/interactive Applications. According to IEEE 802.16 MAC protocol, there are three scheduling algorithms for assigning TDMA slots to each network node: centralized and distributed the distributed is further divided into two operational modes coordinated distributed and uncoordinated distributed. In coordinated distributed scheduling algorithm, network nodes have to transmit scheduling message in order to inform other nodes about their transfer schedule. In this paper a new approach is proposed to improve coordinated distributed scheduling efficiency in IEEE 802.16 mesh mode, with respect to three parameter Throughput, Average end to end delay and Normalized Overhead. For evaluating the proposed networks efficiency, several extensive simulations are performed in various network configurations and the most important system parameters which affect the network performance are analyzed

Biosecurity and Public Health Ethics Issues Raised by Biological Threats

2019 ◽  
pp. 773-785
Author(s):  
Nicholas Evans ◽  
Thomas Inglesby
Keyword(s):  
Public Health ◽  
Resource Allocation ◽  
Infectious Diseases ◽  
Ethical Issues ◽  
Emerging Infectious Diseases ◽  
Biological Weapon ◽  
Ethical Values ◽  
Dual Use ◽  
Health Concerns ◽  
Trade Offs

This chapter introduces ethical issues that arise in the context of biosecurity: policies and actions intended to prevent the development or emergence, or mitigate the consequences, of serious biological threats. These threats could include deliberate biological weapon attacks (bioterrorism), pandemics, emerging infectious diseases, or major laboratory accidents. The basic values that underpin these public health concerns are first introduced. Ethical issues that arise before, during, and following a biosecurity crisis are then examined, including issues of resource allocation, dual-use research, and the possibility of quarantine. Their resolution requires trade-offs among different ethical values, including utility, fairness, and liberty.

Adaptive Resource Allocation for WiMAX Mesh Network

2019 ◽  
Vol 107 (2) ◽  
pp. 849-867 ◽  
Author(s):  
Mahboubeh Afzali ◽  
Kamalrulnizam AbuBakar ◽  
Jaime Lloret
Keyword(s):  
Resource Allocation ◽  
Mesh Network ◽  
Adaptive Resource Allocation ◽  
Adaptive Resource ◽  
Wimax Mesh Network

Capturing Effects of Maintenance Practices in Highway Asset Valuation: Replacement-Cost Approach Versus Book-Value Method

2003 ◽  
Vol 1824 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Poovadol Sirirangsi ◽  
Adjo Amekudzi ◽  
Pannapa Herabat
Keyword(s):  
Pavement Management ◽  
Added Value ◽  
Replacement Cost ◽  
Asset Valuation ◽  
Book Value ◽  
Cost Approach ◽  
Trade Offs ◽  
Study Results ◽  
Asset Value ◽  
The Impact

The replacement-cost approach and the book-value method as decision support tools for selecting maintenance alternatives under budget constraints and for capturing the effects of maintenance practices on highway asset value are investigated. By using a case study based on the Thailand Pavement Management System, the replacement-cost approach and the book-value method are applied to analyze maintenance alternatives for selected highways. The versatility of these asset-valuation methods is explored for capturing trade-offs in the type and timing of maintenance and for incorporating the added value of effective maintenance practices and the impact of deferred maintenance in the overall asset value. The study demonstrated that the replacement-cost approach is a more versatile tool for considering the maintenance-related value of highways in maintenance decision making, whereas the book value may be a simpler financial accounting tool. The two approaches may be used together to clarify how maintenance expenditures are being translated into facility replacement value or how the overall value of the infrastructure is being preserved. The study results are potentially useful to agencies interested in capturing the added value of effective maintenance practices in the overall value of their asset base.

scholarly journals Context-Based Topology Control for Wireless Mesh Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-16
Author(s):  
Pragasen Mudali ◽  
Matthew Olusegun Adigun
Keyword(s):  
Topology Control ◽  
Wireless Mesh Network ◽  
Network Performance ◽  
Mesh Networks ◽  
Negative Impact ◽  
Mesh Network ◽  
Adjustment Process ◽  
Spatial Reuse ◽  
Test Bed ◽  
Wireless Mesh

Topology Control has been shown to provide several benefits to wireless ad hoc and mesh networks. However these benefits have largely been demonstrated using simulation-based evaluations. In this paper, we demonstrate the negative impact that the PlainTC Topology Control prototype has on topology stability. This instability is found to be caused by the large number of transceiver power adjustments undertaken by the prototype. A context-based solution is offered to reduce the number of transceiver power adjustments undertaken without sacrificing the cumulative transceiver power savings and spatial reuse advantages gained from employing Topology Control in an infrastructure wireless mesh network. We propose the context-based PlainTC+ prototype and show that incorporating context information in the transceiver power adjustment process significantly reduces topology instability. In addition, improvements to network performance arising from the improved topology stability are also observed. Future plans to add real-time context-awareness to PlainTC+ will have the scheme being prototyped in a software-defined wireless mesh network test-bed being planned.

scholarly journals Educational Uses of the Digital World for Human Development

2013 ◽  
Vol 6 (2) ◽  
pp. 63-83 ◽  
Author(s):  
Colette Daiute
Keyword(s):  
Human Development ◽  
Focal Point ◽  
Human Condition ◽  
Information Storage ◽  
Communication Medium ◽  
Global Context ◽  
Digital World ◽  
The Human Condition

This article discusses several enduring features of the digital world in relation to the dramatically changing global context and visibility of the human condition. Based on the author’s experience as an educator and researcher, she explains that interactivity, multi-modality, and information storage are ripe for advancing students’ creative and critical interactions with diverse others and themselves. With the digital world as a focal point, although by no means the only communication medium, educators are in unique positions to guide contemporary human development, which is increasingly an interdependent individual-societal process, thereby requiring knowledge of realities beyond one’s own.

scholarly journals Establishment Network by Using FSO Link Based on MD Code for Hybrid SCM-SAC-OCDMA Wireless System

2018 ◽  
Vol 8 (6) ◽  
pp. 5107
Author(s):  
Rashid Ali Fayadh ◽  
Mousa K. Wali ◽  
Mehdi F. Bonneya
Keyword(s):  
Mesh Networks ◽  
Wireless Systems ◽  
Wireless Channel ◽  
Mesh Network ◽  
Spectral Amplitude ◽  
Modulation Scheme ◽  
Atmospheric Effects ◽  
Free Space Optic ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

<p>Since the wireless systems are working under nature environments and influenced by turbulence, weather in Iraq that leads to extended amount of fading signal, dissipation or attenuation. Basic “hybrid Subcarrier Multiplying Spectral Amplitude Coding (SCM-SAC) of Optical Code Division Multiple Access (OCDMA)" indoor or outdoor optical system depends on generally “Multi-Diagonal (MD)" security code by using optical space known as “Free Space Optic (FSO)" that was proposed in this work. It is found that the mention hybrid wireless systems can be used in operating mesh networks. The main proposed idea of hybrid optical technique was analyzed and simulated by normally taking into simulation account that the directly effecting by rain and haze attenuations. In addition, there are mention and description for atmospheric effects, FSO mesh network, modulation scheme, simulation, and the data security. From simulation results, the hybrid system using MD code produces reduced “bit-error rate (BER)" at heavy storm rain to distance or range of 500 m and at drizzle rain up to 2500 m range. And also investigates the performance of using the proposed system with radio over fiber (RoF) for UWB signals through indoor propagation in building applications of wireless channel.</p>

scholarly journals Enhancement of data transmission using optimized multi-cell approach in 5G backhaul wireless mesh network

2019 ◽  
Vol 14 (1) ◽  
pp. 65
Author(s):  
Nirmalkumar S Benni ◽  
Sunilkumar S Manvi
Keyword(s):  
Data Transmission ◽  
High Speed ◽  
User Equipment ◽  
Mesh Network ◽  
Wave Band ◽  
Estimation Errors ◽  
Traffic Routing ◽  
Centimeter Wave ◽  
Channel Information ◽  
High Speed Data

<p><span>The millimeter wave (mmWave) band and its usage has taken an attention in this 5G creation as its implementation can provide ultra-high speed data transmission in wireless network. This is much better than the centimeter wave-band as it has limitations on the bandwidth usage. While considering the 5G networking with the backhaul-topologies, the network and user-equipment performance depends on the selection of serving receiving nodes (RNs) of the user-equipment (UE). Therefore, the algorithms that reduces the complexity of the UE association and the backhaul traffic-routing must be chosen, which thereby maximizes the efficiency of the spectrum and energy of network. The modifications are done to the Multicellular local solution (McLS)approach, which leads to our proposed algorithm that is, improved against the channel information estimation-errors. The optimized multi-cell approach (OMcA) is formed by combining the improved-parameter, the pre-coder, mean square error (MSE) weighted-variable and receive filter. The proposed OMcA is compared with some other existing technique in order to evaluate the performance in terms of sum rate (SR).</span></p>

scholarly journals A Novel Packet Aggregation Mechanism for Enhancing VoIP Performance on IEEE 802.11 Wireless Mesh Networks

2020 ◽  
Vol 8 (8) ◽  
pp. 01-08
Author(s):  
Guan-Hsiung Liaw et al.
Keyword(s):  
Ieee 802.11 ◽  
Mesh Networks ◽  
Mesh Network ◽  
Time Intervals ◽  
Aggregation Mechanism ◽  
Packet Aggregation ◽  
Wireless Mesh ◽  
Aggregation Scheme ◽  
Voice Data ◽  
The Voice

In 802.11 Wireless Mesh Network (WMN), bandwidth will be wasted much for transferring VoIP flows since each voice frame must contain relatively large amount of protocol data. “Packet Aggregation” mechanism can be applied to merge the voice data of multiple VoIP flows into one frame for transmission. It reduces the waste on bandwidth and increases the maximum number of successful VoIP calls. In addition, the mechanism “MCF controlled channel access” (MCCA) defined in 802.11 standard can be used to obtain better QoS than adopting default EDCA mechanism. In MCCA, mesh stations which wants to transfer VoIP flows can reserve time intervals of the medium for transmission and this reservation will be advertised to their neighbors. It is why MCCA causes less medium contentions than EDCA. In this paper, a mechanism to transfer VoIP flows in IEEE 802.11 WMN by MCCA with packet aggregation scheme is proposed. The effectiveness of the proposed mechanism is shown by simulation results. In addition, the problem named as Routing-Packet Aggregation / De-aggregation-Scheduling optimization problem (abbr. RPADS problem) derived from the proposed mechanism is also studied. A heuristic algorithm for RPADS problem to maximize the total number of supported calls is also proposed.

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