Search results for "IEEE"

showing 10 items of 135 documents

Experimental Assessment of the Backoff Behavior of Commercial IEEE 802.11b Network Cards

2007

It has been observed that different IEEE 802.11 commercial cards produced by different vendors experience different performance, either when accessing alone the channel, as well as when competing against each other. These differences persist also when thorough measurement methodologies (such as RF shielding, laptop rotation, etc) are applied, and alignment of the environmental factors (same laptop models, traffic generators, etc) is carried out. This paper provides an extensive experimental characterization of the backoff operation of six commercial NIC cards. It suggests a relevant methodological approach, namely a repeatable, well defined, set of experiments, for such a characterization. …

IEEE 802business.product_categoryComputer scienceNetwork cardsSoftware performance testingComputer software; Laptop computers; Telecommunication traffic; Low level backoff distribution measurements; Network cards; Traffic generators; Window size; Network architectureLaptop computerscomputer.software_genreSettore ING-INF/01 - ElettronicaSoftwareMicrocodeComputer softwareWindow sizeTraffic generatorsSettore ING-INF/03 - Telecomunicazionibusiness.industryFirmwareNetwork architecturePortable computers Rotation measurement Radio frequency Environmental factorsTelecommunication trafficNetwork interface controllerLaptopEmbedded systemLow level backoff distribution measurementsbusinesscomputerCommunication channelIEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications
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Rethinking the IEEE 802.11e EDCA Performance Modeling Methodology

2010

Analytical modeling of the 802.11e enhanced distributed channel access (EDCA) mechanism is today a fairly mature research area, considering the very large number of papers that have appeared in the literature. However, most work in this area models the EDCA operation through per-slot statistics, namely probability of transmission and collisions referred to "slots." In so doing, they still share a methodology originally proposed for the 802.11 Distributed Coordination Function (DCF), although they do extend it by considering differentiated transmission/ collision probabilities over different slots.We aim to show that it is possible to devise 802.11e models that do not rely on per-slot statis…

IEEE 802medium access protocolSettore ING-INF/03 - TelecomunicazioniComputer Networks and Communicationsbusiness.industryComputer scienceWiFiDistributed computingQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSQoSThroughputDistributed coordination functionComputer Science ApplicationsTransmission (telecommunications)Wireless lanElectrical and Electronic EngineeringbusinessThroughput (business)SoftwareComputer networkCommunication channelIEEE/ACM Transactions on Networking
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On the anomalous behavior of IEEE 802.11 commercial cards

2006

IEEE 802.11 experimental measures
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Analysis of the limitations of WiFi communications managed by the IEEE 802.11 protocol in data transmission in automated power distribution systems

2010

This paper presents a study on the performances of the IEEE 802.11 protocol used in a Medium Voltage networks management system, carried out using a model for the simulation of WiFi chains architectures. The results of the simulations give some practical indications for the use of the IEEE 802.11 protocol also in presence of transmissions characterized by rigid time intervals, for which this protocol is usually not suitable. Finally the whole communications system is presented.

IEEE 802.11EngineeringIEEE 802IEEE 802.11uSettore ING-INF/03 - Telecomunicazionibusiness.industryInter-Access Point ProtocolWiFiComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaIEEE 802.1QEmbedded systemIEEE 802.11g-2003DiagnosticIEEE 802.1XbusinessComputer networkIEEE 802.11sIEEE 802.11r-2008SPEEDAM 2010
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Enabling a win-win coexistence mechanism for WiFi and LTE in unlicensed bands

2018

The problem of WiFi and LTE coexistence has been significantly debated in the last years, with the emergence of LTE extensions enabling the utilization of unlicensed spectrum for carrier aggregation. Since the two technologies employ com-pletely different access protocols and frame transmission times, supporting coexistence with minimal modifications on existing protocols is not an easy task. Current solutions are often based on LTE unilateral adaptations, being LTE in unlicensed bands still under definition. In this paper, we demonstrate that it is possible to avoid a subordinated role for WiFi nodes, by simply equipping WiFi nodes with a sensing mechanism based on adaptive tunings of the …

IEEE 802.11Information Systems and ManagementUnlicensed bandbusiness.industryComputer scienceWiFiComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS05 social sciencesMechanism based050801 communication & media studies020206 networking & telecommunications02 engineering and technologySpectrum managementScheduling (computing)Win-win game0508 media and communicationsIEEE 802.11Computer Networks and CommunicationWhite spaces0202 electrical engineering electronic engineering information engineeringLTE-UbusinessComputer networkISM coexistency
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Do Current Domestic Gigabit Wireless Technologies Fulfill User Requirements for Ultra High Definition Videos?

2017

We present the results from a measurement-based performance evaluation of wireless networks based on IEEE 802.11n and IEEE 802.11ac standards in an indoor environment, with the aim to analyze their performance under high definition streaming video applications. We focus our study on analyzing the highest performance of these standards using off-the-shelf equipment, both with synthetic TCP and UDP traffic to measure the saturation throughput as well as high definition video streams. The measurements have been conducted in the student labs of our university and show good performance for streaming purposes in high definition and also ultra-high definition from a subjective video quality point …

IEEE 802.11u021103 operations researchWireless networkInter-Access Point Protocolbusiness.industryComputer scienceReal-time computing0211 other engineering and technologies02 engineering and technologyIEEE 802.11b-1999Gigabit0202 electrical engineering electronic engineering information engineeringWireless020201 artificial intelligence & image processingIEEE 802.11e-2005businessSubjective video qualityIEEE 802.11sComputer network2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC)
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Assessing the effectiveness of IEEE 802.11e in multi-hop mobile network environments

2004

The IEEE 802.11e technology is receiving much interest due to the promising enhancements it offers to wireless local area networks in terms of QoS support. Until now, research has focused on single hop, access point based environments, which are the most common. We review the enhancements proposed in the last IEEE 802.11e draft (version 8.0). We analyze the performance of the IEEE 802.11e protocol on ad-hoc networks (multi-hop) in terms of throughput and end-to-end delay. We also measure the effectiveness for static and fully dynamic networks with a variable number of source stations. Finally, we analyze the performance of IEEE 802.11e when legacy IEEE 802.11 stations (no IEEE 802.11e suppo…

IEEE 802.11uIEEE 802IEEE 802.11w-2009business.industryComputer scienceInter-Access Point ProtocolDistributed computingComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSIEEE 802.11b-1999IEEE 802.1XbusinessIEEE 802.11sComputer networkIEEE 802.11r-2008
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QoS Support for Time-Constrained Multimedia Communications in IEEE 802.11 WLANs: A Performance Evaluation

2005

During the past few years, we have been witnessing the massive deployment of IEEE 802.11 wireless LANs. Even though the widespread deployment of such wireless LANs, many studies are still underway aiming to design and develop simple yet effective QoS mechanisms for supporting time-constrained services over such platforms. In this paper, we first overview five different QoS mechanisms recently introduced in the literature as well as the upcoming IEEE 802.11e (EDCA) standard. We then carry out a comparative performance evaluation of all the QoS mechanisms. We focus our study on the effectiveness of the various QoS mechanisms for supporting time-constrained services.

IEEE 802.11uIEEE 802IEEE 802.11w-2009business.industryInter-Access Point ProtocolComputer scienceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWireless Multimedia ExtensionsMobile QoSIEEE 802.11e-2005businessTelecommunicationsComputer networkIEEE 802.11r-20082005 Systems Communications (ICW'05, ICHSN'05, ICMCS'05, SENET'05)
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QoS Mechanisms for IEEE 802.11 Wireless LANs

2004

Currently the Internet provides users with access to information across the world using IP technology. Until now most access points to the Internet have been fixed stations at given locations, but with increasing sales of mobile devices, mobility has become a major trend. Therefore, the Internet is becoming more and more heterogeneous due to the recent explosion of wireless networks. The IEEE 802.11 wireless LAN (WLAN) is the most widely used WLAN standard nowadays. Currently the IEEE 802.11 standard specifies an over-the-air interface between wireless devices. However, QoS services over this technology are still being defined aiming to provide support to multiple applications. Thus, a larg…

IEEE 802.11uWi-Fi arrayComputer scienceInter-Access Point ProtocolMobile computinglaw.inventionIEEE 802.11lawWireless lanInternet ProtocolWirelessFixed wirelessIEEE 802.11sbusiness.industryWireless networkQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWireless Multimedia ExtensionsTelecommunications networkWLAN Authentication and Privacy InfrastructureWireless site surveyThe InternetIEEE 802.11e-2005businessTelecommunicationsMobile deviceNeuRFonComputer network
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Time synchronization enhancements in wireless networks with ultra wide band communications

2022

The emergence of low cost Ultra Wide Band (UWB) transceivers has enabled the implementation of Wireless Sensor Networks (WSN) based on this communication technology. These networks are composed of distributed autonomous low cost nodes (also known as motes) with their own processing unit, memory and communications. Usually these nodes are power-limited and due to the poor performance and quality of their clocks, time synchronization is in the order of milliseconds and in some specific scenarios till microseconds. The integration of commercial UWB transceivers in these nodes can improve the synchronization accuracy. In particular, we focus on WSN nodes based on off-the-shelf commercial produc…

IEEE 802.15.4Computer Networks and Communicationslinear regressionultra wide bandUNESCO::CIENCIAS TECNOLÓGICAStime synchronizationwireless sensor networksComputer Communications
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