Search results for " Network"

showing 10 items of 6428 documents

A Survey on LoRa for Smart Agriculture: Current Trends and Future Perspectives

2023

This paper provides a survey on the adoption of LoRa in the agricultural field, and reviews state-of-the-art solutions for Smart Agriculture, analyzing the potential of this technology in different infield applications. In particular, we consider four reference scenarios, namely irrigation systems, plantation and crop monitoring, tree monitoring, and livestock monitoring, which exhibit heterogeneous requirements in terms of network bandwidth, density, sensors’ complexity, and energy demand, as well as latency in the decision process. We discuss how LoRa-based solutions can work in these scenarios, analyzing their scalability, interoperability, network architecture, and energy-efficiency. Fi…

Settore ING-INF/03 - TelecomunicazioniComputer Networks and CommunicationsHardware and ArchitectureSignal ProcessingInternet of Things Internet of Things (IoT) LoRa LoRaWAN LPWAN Monitoring Power demand Precision Agriculture Sensors Smart Agriculture Smart farming Temperature sensors Wireless sensor networks Wireless Sensor Networks (WSN)Settore ING-INF/01 - ElettronicaComputer Science ApplicationsInformation SystemsIEEE Internet of Things Journal
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The quest for bandwidth estimation techniques for large-scale distributed systems

2010

In recent years the research community has developed many techniques to estimate the end-to-end available bandwidth of an Internet path. This important metric can be potentially exploited to optimize the performance of several distributed systems and, even, to improve the effectiveness of the congestion control mechanism of TCP. Thus, it has been suggested that some existing estimation techniques could be used for this purpose. However, existing tools were not designed for large-scale deployments and were mostly validated in controlled settings, considering only one measurement running at a time. In this paper, we argue that current tools, while offering good estimates when used alone, migh…

Settore ING-INF/03 - TelecomunicazioniComputer Networks and Communicationsbusiness.industryComputer scienceScale (chemistry)Distributed computingTestbedNetwork congestionHardware and ArchitectureMetric (mathematics)Path (graph theory)bandwidth estimationBandwidth (computing)Overhead (computing)The InternetbusinessSoftwareACM SIGMETRICS Performance Evaluation Review
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Large-Scale Available Bandwidth Measurements: Interference in Current Techniques

2011

The end-to-end available bandwidth of an Internet path is a desirable information that can be exploited to optimize system performance. Several tools have been proposed in the past to estimate it. However, existing measurement techniques were not designed for large-scale deployments. In this paper we show that current tools do not properly work where multiple probing processes share a portion of a path. We provide experimental evidence to quantify the impact of mutual interference between measurements. We further analyze the characteristics of popular tools, quantifying (i) the impact of mutual interference, (ii) the total overhead imposed to the network and (iii) the intrusiveness of the m…

Settore ING-INF/03 - TelecomunicazioniComputer Networks and Communicationsbusiness.industryComputer scienceSystem of measurementReal-time computingAvailable BandwidthProcess (computing)Interference (wave propagation)ScalabilityBandwidth (computing)Overhead (computing)The InternetElectrical and Electronic EngineeringbusinessDimensioning
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An energy analysis of IEEE 802.15.6 scheduled access modes

2010

Body Area Networks (BANs) are an emerging area of wireless personal communications. The IEEE 802.15.6 working group aims to develop a communications standard optimised for low power devices operating on, in or around the human body. IEEE 802.15.6 specifically targets low power medical application areas. The IEEE 802.15.6 draft defines two main channel access modes; contention based and contention free. This paper examines the energy lifetime performance of contention free access and in particular of periodic scheduled allocations. This paper presents an overview of the IEEE 802.15.6 and an analytical model for estimating the device lifetime. The analysis determines the maximum device lifeti…

Settore ING-INF/03 - TelecomunicazioniComputer scienceInter-Access Point Protocolbusiness.industryPhysical layerbiomedical communication body area networks personal area networksIEEE 802.15.6 scheduled access modes body area network channel access modes communications standard device lifetime estimation energy analysis energy lifetime performance human body low power devices low power medical application areas periodic scheduled allocation wireless personal communicationTelecommunications linkBody area networkWirelessIEEE 802.11e-2005TransceiverbusinessIEEE 802.15IEEE 802.11r-2008Computer network2010 IEEE Globecom Workshops
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Coexistence between IEEE802.15.4 and IEEE802.11 through cross-technology signaling

2017

When different technologies use the same frequency bands in close proximity, the resulting interference typically results in performance degradation. Coexistence methods exist, but these are often technology specific and requiring technology specific interference detection methods. To remove the root cause of the performance degradation, devices should be able to negotiate medium access even when using different technologies. To this end, this paper proposes an architecture that allows crosstechnology medium access by means of a Time Division Multiple Access (TDMA) scheme. In order to achieve cross-technology synchronization, which is required for the TDMA solution, an energy pattern beacon…

Settore ING-INF/03 - TelecomunicazioniComputer sciencebusiness.industryDistributed computingComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSTestbedTime division multiple access020206 networking & telecommunications02 engineering and technologyInterference (wave propagation)Radio spectrumSynchronization (computer science)0202 electrical engineering electronic engineering information engineeringWirelessIBCN020201 artificial intelligence & image processingMAC protocols interference mitigation crosstechnology TDMA scheme energy pattern beacon parameter negotiationbusinessEnergy (signal processing)Degradation (telecommunications)2017 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS)
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Cross-Technology WiFi/ZigBee Communications: Dealing With Channel Insertions and Deletions

2016

In this letter, we show how cross-technology interference can be exploited to set up a low-rate bidirectional communication channel between heterogeneous WiFi and ZigBee networks. Because of the environment noise and receivers' implementation, the cross-technology channel can be severely affected by insertions and deletions of symbols, whose effects need to be taken into account by the coding scheme and communication protocol.

Settore ING-INF/03 - TelecomunicazioniComputer sciencebusiness.industryWiFichannelinterferencewireless coexistenceComputer Science Applications1707 Computer Vision and Pattern Recognition020206 networking & telecommunications020302 automobile design & engineeringinterference; wireless coexistence; WLAN; Modeling and Simulation; Computer Science Applications1707 Computer Vision and Pattern Recognition; Electrical and Electronic Engineering02 engineering and technologyComputer Science ApplicationsWLANZigBee0203 mechanical engineeringModeling and Simulation0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringbusinessCommunications protocolComputer networkCommunication channelIEEE Communications Letters
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INDOOR LOCALIZATION USING COGNITIVE RADIOS AND SOFTWARE-DEFINED WIRELESS NETWORKS

Settore ING-INF/03 - TelecomunicazioniIndoor localization positioning RSSI AoA ToA DToA fingerprinting architecture cognitive radio software-defined networks
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Correlation-Based Similarity Metric For Clustering In Multimedia Social Network

2011

Settore ING-INF/03 - TelecomunicazioniMultimedia Social Network Clustering
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Offloading through Opportunistic Networks with Dynamic Content Requests

2014

Offloading is gaining momentum as a technique to overcome the cellular capacity crunch due to the surge of mobile data traffic demand. Multiple offloading techniques are currently under investigation, from modifications inside the cellular network architecture, to integration of multiple wireless broadband infrastructures, to exploiting direct communications between mobile devices. In this paper we focus on the latter type of offloading, and specifically on offloading through opportunistic networks. As opposed to most of the literature looking at this type of offloading, in this paper we consider the case where requests for content are non-synchronised, i.e. users request content at random …

Settore ING-INF/03 - TelecomunicazioniOpportunistic network Mobile Data Offloading Dynamic Contet Request WiFi-direct BluetoothOpportunistic Networks
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Supporting code mobility and dynamic reconfigurations over Wireless MAC Processor Prototype

2014

Mobile networks for Internet Access are a fundamental segment of Internet access net- works, where resource optimization are really critical because of the limited bandwidth availability. While traditionally resource optimizations have been focused on high effi- cient modulation and coding schemes, to be dynamically tuned according to the wireless channel and interference conditions, it has also been shown how medium access schemes can have a significant impact on the network performance according to the application and networking scenarios. This thesis work proposes an architectural solution for supporting Medium Access Con- trol (MAC) reconfigurations in terms of dynamic programming and c…

Settore ING-INF/03 - TelecomunicazioniWireless MAC Processor Software Defined Network Network Programmability Cognitive Network
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