Download or read book Performance Analysis of Wireless LAN Access Points written by and published by . This book was released on 2003 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 802 11 Wireless Networks written by Alan Holt and published by Springer Science & Business Media. This book was released on 2010-06-25 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique and practical text introduces the principles of WLANs based upon the IEEE 802.11 standards, demonstrating how to configure equipment in order to implement various network solutions. The text is supported by examples and detailed instructions.

Download or read book Performance Analysis of the IEEE 802 11 based Wireless Networks in the Presence of Hidden Stations written by Fu-Yi Hung and published by . This book was released on 2009 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IEEE 802.11 is the most widely used standard in WLAN currently. It can support not only a WLAN with an access point but also an ad hoc wireless network. The key for being able to support various wireless networks is the Distribution Coordination Function (DCF) which is one of channel access methods in the IEEE 802.11 Medium Access Control (MAC) protocol. The DCF is a random access method where each station has the right to initiate a transmission without any central coordination. Hence, this method is useable not only in infrastructure network configurations but also in distributed and self-organized wireless networks. However, this random access method unavoidably introduces the hidden station problem that multiple stations simultaneously transmit packets to a common destination resulting in packet collision at the destination. This problem results from that DCF does not support the destination coordinating the traffic inside its transmission range. The hidden station problem is unique to wireless networks and significantly degrades the performance of wireless networks, but this problem has been ignored in previous studies. We propose our research work that model and analyze the performance of wireless networks including the hidden station effect in access-point and ad hoc type wireless networks. In access-point based wireless networks, we present a modified two-dimensional Markov chain model that characterizes the network performance in the presence of hidden stations. This model generalizes the existing work on IEEE 802.11 DCF performance modeling, and it is validated by comparison with ns-2 simulation. Second, in wireless ad hoc networks, the hidden station effect is different from that in an access-point based wireless network. Furthermore, this effect largely depends on the sender-receiver distance and physical carrier-sensing range. We devise a spatiotemporal analytical model that estimates the number of hidden stations based on the sender-receiver distance and physical carrier-sensing range. In addition, we also use our two-dimensional Markov chain model to evaluate the network performance under the hidden station effect in wireless ad hoc network. This result is in agreement with the result obtained by ns-2 simulation.

Download or read book LTE WiMAX and WLAN Network Design Optimization and Performance Analysis written by Leonhard Korowajczuk and published by John Wiley & Sons. This book was released on 2011-08-22 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technological overview of LTE and WiMAX LTE, WiMAX and WLAN Network Design, Optimization and Performance Analysis provides a practical guide to LTE and WiMAX technologies introducing various tools and concepts used within. In addition, topics such as traffic modelling of IP-centric networks, RF propagation, fading, mobility, and indoor coverage are explored; new techniques which increase throughput such as MIMO and AAS technology are highlighted; and simulation, network design and performance analysis are also examined. Finally, in the latter part of the book Korowajczuk gives a step-by-step guide to network design, providing readers with the capability to build reliable and robust data networks. By focusing on LTE and WiMAX this book extends current network planning approaches to next generation wireless systems based on OFDMA, providing an essential resource for engineers and operators of fixed and wireless broadband data access networks. With information presented in a sequential format, LTE, WiMAX and WLAN Network Design, Optimization and Performance Analysis aids a progressive development of knowledge, complementing latter graduate and postgraduate courses while also providing a valuable resource to network designers, equipment vendors, reference material, operators, consultants, and regulators. Key Features: One of the first books to comprehensively explain and evaluate LTE Provides an unique explanation of the basic concepts involved in wireless broadband technologies and their applications in LTE, WiMAX, and WLAN before progressing to the network design Demonstrates the application of network planning for LTE and WiMAX with theoretical and practical approaches Includes all aspects of system design and optimization, such as dynamic traffic simulations, multi-layered traffic analysis, statistical interference analysis, and performance estimations

Download or read book Evaluation of WLAN Security and Performance written by Alikira Richard and published by GRIN Verlag. This book was released on 2012-12-06 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research Paper (postgraduate) from the year 2012 in the subject Computer Science - Internet, New Technologies, Kampala International University (School of postgraduate studies/computer department), course: Network security, language: English, abstract: This report addresses the reality of Wireless LAN security and performance. It provides an overview of security mechanisms and explains how security works in Wireless LAN networks. An in depth analysis of the Wired Equivalent Privacy (WEP), Wi-Fi protected access (WPA) and WPA2 standards is presented. The security vulnerabilities that exist in them are analyzed and explained. An experiment involving four devices (Dlink, Linksys, nanostationloco2 and a WBS) was done at Kampala international university. It was discovered from literature that most people prefer using WEP yet it is least secure. One study says 30% of all WLANs detected during network discovery experiment operate with WEP encryption. The study further proved that WEP can be compromised with 100% success. It was also discovered during the experiment that factors such as line of sight, obstruction, distance, antenna type, channel being used all affect network performance. The findings of this experiment can be used as guideline choosing the right encryption method and in designing a WLAN.

Download or read book Performance Analysis in Wireless HetNets Traffic Energy and Secrecy Considerations written by Georgios Smpokos and published by Linköping University Electronic Press. This book was released on 2021-03-17 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: To this day, most of the communication networks are characterized by a "monolithic" operating approach. Network elements are configured and operate without any reconfiguration for long time periods. Softwarization, whereby dedicated elements are being replaced by more general-purpose devices, has been lately challenging this existing approach. Virtualizing the infrastructure through the softwarization can provide significant benefits to end users and operators, supporting more flexible service deployment, providing real time monitoring and operational changes. In Paper I we study a novel allocation technique and traffic optimization process for the access network. Cellular network technologies (i.e. UMTS, LTE, LTE-A) will coexist with non-cellular small cells and offload traffic from cellular to non-cellular networks mainly operating in 3GPP Wi-Fi (IEEE 802.11 standards). This is a scenario for indoor wireless access implementations where offloading mechanisms can improve the QoS offered by the operators, and reduce the traffic handled by the access fronthaul. The analysis of a novel optimization algorithm exhibited a holistic solution for access-core interworking where LWA (LTE-WiFi Aggregation) offers improved performance for the end users. In order to optimize core network operations factors such as the operational costs should be addressed. Following this approach in Paper II we analysed how environmental factors (e.g. temperature, humidity) can affect the power consumption of core network data centers (cooling systems). By applying machine learning techniques using data from a data center, we were able to forecast the power consumption based on to atmospheric weather conditions and analyse its accuracy. Optimizing the access network operations and the interworking (resource allocation, scheduling, offloading) can lead to highly configurable and secure operations. These have been factors of great concern as wireless connectivity increases in denser populated areas. In Paper III we examine the physical layer secrecy aspects of a collaborative small cell network in the presence of parallel connections and caching capabilities at the edge nodes. Using tools from the probability theory, we examined how the power allocation for the transmissions can ensure secrecy in the presence of an eavesdropper.

Download or read book Performance Analysis of Multi Channel and Multi Traffic on Wireless Communication Networks written by Wuyi Yue and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapidly increasing penetration of laptop computers and mobile phones, which are primarily used by mobile users to access Internet s- vices like e-mail and World Wide Web (WWW) access, support of Internet services in a mobile environment is an emerging requirement. Wireless n- works have been used for communication among fully distributed users in a multimedia environment that has the needs to provide real-time bursty traffic (such as voice or video) and data traffic with excellent reliability and service quality. To satisfy the huge wireless multimedia service demand and improve the system performance, efficient channel access methods and analytical methods must be provided. In this way very accurate models, that faithfully reproduce the stochastic behavior of multimedia wireless communication and computer networks, can be constructed. Most of these system models are discrete-time queueing systems. Queueing networks and Markov chains are commonly used for the p- formance and reliability evaluation of computer, communication, and m- ufacturing systems. Although there are quite a few books on the individual topics of queueing networks and Markov chains, we have found none that covers the topics of discrete-time and continuous-time multichannel mul- traffic queueing networks. On the other hand, the design and development of multichannel mul- hop network systems and interconnected network systems or integrated n- works of multimedia traffic require not only such average performance m- sures as the throughput or packet delay but also higher moments of traffic departures and transmission delay.

Download or read book A Methodology for Performance Analysis of IEEE 802 11 Wireless LAN Medium Access Control Protocol written by Nitin Gupta and published by . This book was released on 2004 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Wireless Networks written by Geyong Ming and published by Nova Publishers. This book was released on 2007 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have witnessed tremendous growth in the population of mobile users demanding high performance, reliability and quality-of-service (QoS). Wireless networks are undergoing rapid developments and dramatic changes in the underlying technologies, in order to cope with the difficulties posed by the scarce wireless resource as well as keep up with the increasing day-to-day demand for cost-effective service of multimedia applications. Predicting and optimising the performance and QoS of wireless networks using analytical modelling, simulation experiments, monitoring and testbed-based measurements are crucial to the proper design, tuning, resource management and capacity planning of such networks. This book is dedicated to review important developments and results, explore recent state-of-the-art research and discuss new strategies for performance modelling, analysis and enhancement of wireless networks. The objective is to make analytical modelling, simulation and measurement tools, and innovative performance evaluation methodology possible and understandable to a wider audience.

Download or read book Improving the Performance of Wireless LANs written by Nurul Sarkar and published by CRC Press. This book was released on 2014-01-08 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: While there are countless books on wireless networks, few actually quantify the key performance-limiting factors of wireless local area networks (WLANs) and describe various methods for improving WLAN performance. Fulfilling these needs, Improving the Performance of Wireless LANs: A Practical Guide provides both theoretical background and empirical results for the optimum planning and deployment of high performance WLAN systems in different residential and commercial buildings. Useful to students, faculties, researchers, engineers, and network developers, this must-have book not only explains the fundamentals of WLAN systems, including WLAN features and standards, but also: Supplies strategic guidelines for WLAN system design, modeling, and performance evaluation Includes radio propagation and site measurements as well as simulations for various network design scenarios Discusses environmental effects on WLAN performance, protocol redesign for routing and MAC, and traffic distribution Contains numerous illustrations and examples, plus chapter summaries, review questions, reading lists, mini-projects, an extensive glossary, and a list of acronyms Examines emerging and future network technologies, such as next generation Wi-Fi (802.11ac), very high throughput Wi-Fi (802.11ad), wireless mesh networking (802.11s), emergency QoS (802.11u), and vehicle-to-vehicle communications (802.11p) Improving the Performance of Wireless LANs: A Practical Guide makes the teaching, learning, and researching of advanced wireless network design and performance a more active process by using practical tools and exercises to add life to this highly technical subject.

Download or read book Modelling of IEEE 802 11 Wireless LAN and Medium Access Control Layer Performance Analysis written by Wei Wen Lu and published by . This book was released on 2000 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Information Systems Architecture and Technology Proceedings of 40th Anniversary International Conference on Information Systems Architecture and Technology ISAT 2019 written by Leszek Borzemski and published by Springer Nature. This book was released on 2019-09-04 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This three-volume book highlights significant advances in the development of new information systems technologies and architectures. Further, it helps readers solve specific research and analytical problems and glean useful knowledge and business value from data. Each chapter provides an analysis of a specific technical problem, followed by a numerical analysis, simulation, and implementation of the solution to the real-world problem. Managing an organization, especially in today’s rapidly changing environment, is a highly complex process. Increased competition in the marketplace, especially as a result of the massive and successful entry of foreign businesses into domestic markets, changes in consumer behaviour, and broader access to new technologies and information, calls for organisational restructuring and the introduction and modification of management methods using the latest scientific advances. This situation has prompted various decision-making bodies to introduce computer modelling of organization management systems. This book presents the peer-reviewed proceedings of the 40th Anniversary International Conference “Information Systems Architecture and Technology” (ISAT), held on September 15–17, 2019, in Wrocław, Poland. The conference was organised by the Computer Science Department, Faculty of Computer Science and Management, Wroclaw University of Sciences and Technology, and University of Applied Sciences in Nysa, Poland. The papers have been grouped into three major sections: Part I—discusses topics including, but not limited to, artificial intelligence methods, knowledge discovery and data mining, big data, knowledge-based management, Internet of Things, cloud computing and high-performance computing, distributed computer systems, content delivery networks, and service-oriented computing. Part II—addresses various topics, such as system modelling for control, recognition and decision support, mathematical modelling in computer system design, service-oriented systems, and cloud computing, and complex process modelling. Part III—focuses on a number of themes, like knowledge-based management, modelling of financial and investment decisions, modelling of managerial decisions, production systems management, and maintenance, risk management, small business management, and theories and models of innovation.

Download or read book Performance Analysis of Multiple Classes of Traffic in Wi Fi Networks written by Sajib Datta and published by . This book was released on 2017 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation develops analytical models for performance evaluation of WiFi networks (IEEE 802.11e/g wireless LANs) and designs admission control strategy that guarantees the quality of service (QoS) requirements of the accepted traffic. Guaranteeing QoS is a major challenge, particularly for real-time multimedia traffic such as voice and video. The QoS measures of interest are throughput, delay, collision probability, and packet loss probability. Our analytical models accurately capture the complexity of multiple classes of traffic in Wi-Fi networks; we also attain several valuable insights about the performance of IEEE 802.11 WLANs. Our study is based on the infrastructure wireless local area networks (WLANs) setting, in which mobile stations (STAs) access a high speed LAN (e.g., Eethernet) via an access point (AP). After deriving analytical models for interactive voice calls and video-conferencing traffic, we extend this model to include transport control protocol (TCP) for file downloads. Our model includes downlink video streaming traffic. We estimate the maximum number of voice calls that can be supported with and without TCP, with and without video; and additionally the maximum video streaming rate when combined with voice over IP (VoIP) calls and TCP controlled file transfers. We also analyze the effect of arbitrary queue size on the voice capacity, video-conferencing capacity and throughput, TCP and video streaming throughput; and determine bandwidth utilization for variable packet arrival rates. Our proposed model is generic in the sense that it provides a high level system view approach, and some of the existing approaches for Wi-Fi performance analysis become special cases of our model for specific queue sizes. The underlying method of our analytic model is to identify an embedded discretetime Markov chain at random times. The Markov chain consists of the number of nonempty queues or mobile STAs, the number of packets is waiting therein and the variable to keep track of which traffic classes are allowed to attempt in a channel slot. Here, the channel slot is defined as the interval between two successive channel activities, which are any sort of action carried out by a mobile station at any time. The stationary probabilities of all the Markov states are derived by solving a set of linear equations, thus obtaining the desired performance measures of IEEE 802.11 WLANs. Finally, we use the Qualnet simulator to simulate the Enhanced Distributed Channel Access (EDCA) model according to the IEEE 802.11 specifications. We also conduct an experimental study of the EDCA mechanism of the IEEE 802.11 standard with a real-environment testbed consisting of one access point and 11 laptops to further validate the analytical model and simulation results.

Download or read book Performance Analysis of the IEEE 802 11 Wireless LAN Standard written by Craig Sweet and published by . This book was released on 1999 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulative Performance Analysis of WLAN Physical Layer written by Ginni Sharma and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade there has been a steady growth in development and implementation of wireless Local Area Networks and emerged as in the largest sectors of the telecommunication industry. Wireless local area network (WLANs) is a new medium of access technology in the Local Area Network (LAN) world. Mostly WLAN applications are used in public sectors such as airports, banks, hotels, offices, city centers because of the flexibility of the people. Orthogonal Frequency Division Multiplexing OFDM has been adopted as a transmission technique for high data rate in WLANs. Matlab Simulation model based on IEEE 802.11a using different Modulation and Demodulation techniques such as BPSK, QPSK and QAM to analysis the best performance of IEEE WLAN physical layer with implementation of OFDM under different error correcting and detection technique.

Download or read book Design and Performance Analysis of Wireless Networks written by Piyush Gupta and published by . This book was released on 2000 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimizing and Testing WLANs written by Tom Alexander and published by Elsevier. This book was released on 2011-04-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimizing and Testing WLANs explores proven techniques for maximizing the coverage area and performance of wireless networks. The author's insider position on the IEEE committee developing standards for WLAN testing ensures timeliness and technical integrity of the material. The book includes coverage of newer multiple input/multiple output (MIMO) wireless networks. The techniques provided will allow engineers to help maintain continuous wireless connectivity to laptops and other mobile devices. Optimizing and Testing WLANs is the first book to address the need to test WLANs (Wireless Local Area Networks) for proper performance and to optimize their operation as they become increasingly common. It covers test equipment and methods for the RF (wireless) and physical layers of WLAN, protocols, the application layer, and manufacturing testing. The emphasis throughout is on underlying engineering principles along with modern metrics and methodologies, ensuring this book gives both a solid theoretical background along with field-proven techniques and applications. A particularly engaging chapter deals with manufacturing test that describes some of the different manufacturing test setups and equipment. A concise introduction to deployment testing of "hotspots" and WLANs in enterprises is also provided. This text will be of interest to RF wireless engineers and designers, networking engineers, IT professionals and managers, and graduate students. *Gives proven techniques for maximizing the coverage area and performance of wireless networks *Author's insider position on the IEEE committee developing standards for WLAN testing ensures timeliness and technical integrity of the material *Includes coverage of newer multiple input/multiple output (MIMO) wireless networks