Approved for public release / The proliferation of Fourth Generation (4G) mobile wireless networks has led to an increased demand for position-based services. In many densely populated environments, there is an abundance of base stations by which a mobile station may be passively geographically located (geolocated) using various techniques that require multiple base stations. Areas in which base station density is sparse may not possess the requisite number of base stations to perform such techniques and, therefore, require different methods by which to geolocate mobile stations. In this thesis, we present a passive geolocation scheme that only requires observation of the initial ranging information exchange between a mobile station and a single base station in order to determine a position estimate for the mobile station. The scheme is specifically applied to the Institute of Electrical and Electronics Engineers (IEEE) 802.16 Worldwide Interoperability for Microwave Access (WiMAX) 4G standard. The method is validated through computer simulation and field experimentation in an Alcatel-Lucent IEEE 802.16e-2005 deployed network. The mean geolocation error resulting from simulation and experimentation was 85 meters, which is a degradation of 58 meters compared to a three-base station scenario. / Captain, United States Marine Corps

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2005. / Thesis Advisor(s): Tri T. Ha. Includes bibliographical references (p. 71-72). Also available online.

Σκοπός της παρούσης διπλωματικής εργασίας είναι η προσομοίωση των λειτουργικών χαρακτηριστικών του ασύρματου δικτύου ΙΕΕΕ 802.16. Στο 1ο κεφάλαιο επιχειρείται μια εισαγωγή στην ασύρματη πρόσβαση ευρείας ζώνης. Στο 2ο κεφάλαιο γίνεται περιληπτική αναφορά στην εξέλιξη του WiFi, τον τρόπο λειτουργίας του και τη σημασία του ως πρόγονος του WiMAX. Στο 3ο κεφάλαιο γίνεται εισαγωγή στο WiMAX, τα διάφορα υποπρότυπα που κυκλοφορούν, τις τεχνολογίες που χρησιμοποιούν και σύγκριση με άλλες υπάρχουσες ασύρματες τεχνολογίες. Στο 4ο κεφάλαιο γίνεται σε βάθος εξερεύνηση του φυσικού στρώματος του WiMAX. Στο 5ο κεφάλαιο μελετούμε το στρώμα πρόσβασης μέσου του προτύπου. Στο 6ο κεφάλαιο αναλύουμε την αρχιτεκτονική του δικτύου WiMAX. Για το πρακτικό μέρος της διπλωματικής στο 7ο κεφάλαιο έγινε προσομοίωση του φυσικού στρώματος ενός ασύρματου ευρυζωνικού πομποδέκτη του υποπροτύπου IEEE 802.16-2004, με χρήση κεραιών ΜΙΜΟ, για σταθερή (fixed) πρόσβαση. Στο 8ο κεφάλαιο βρίσκονται τα συμπεράσματα από τις προσομοιώσεις. / --

This thesis investigates various aspects of bandwidth allocation and scheduling in the Medium Access Control (MAC) layer of IEEE 802.16 systems. We highlight the important aspects of designing a scheduler and describe the scheduler design problem from a general perspective. That is, we provide a scheduler design framework driven by a set of objectives defined for the systems. In addition, we include Subscriber Station differentiation into our scheduler design. This approach is comprehensive, as it covers the requirements of both the network provider and the end users. In developing the framework, we discuss the importance of achieving customer satisfaction. This leads to an interesting objective that maximises the number of satisfied customers, rather than network centric objectives, such as fairness. We contend that providing fairness to customers does not necessarily achieve the best outcome for customer satisfaction and artificially limits the choices available to service providers. In order to maximise the number of satisfied customers, we analyse in detail the Dual-Queue (DQ) scheduling discipline proposed by Hayes et al. [2]. The DQ algorithms of Hayes’ work are focused on wireline networks, and are not directly deployable in an 802.16 environment, as we discuss in this thesis. We propose a modified DQ implementation for 802.16 systems to handle real-time services. In 802.16 systems, there are two scheduling processes that we need to consider: Downlink (DL) scheduling for data transmission from the Base Station to the Subscriber Stations and Uplink (UL) scheduling for data transmission from the Subscriber Stations to the Base Stations. We investigate the DL and UL implementations separately because the UL scheduling process is more complicated due to the fundamentally distributed nature of the problem. We demonstrate that our proposed approach is able to operate effectively in an 802.16 system. We then compare the performance of our proposed DL and UL Dual- Queue schedulers to a Weighted Fair Queue scheduler in noisy environments, where re-transmissions are required. In addition, we also compare our proposed schedulers to an enhanced Weighted Fair Queue scheduler with an Explicit Packet Dropping mechanism. Furthermore, we show that our Dual-Queue system can handle mixed traffic profiles, such as video and voice. Having proposed a DQ implementation that maximises the number of satisfied customers, we investigate alternative objectives that the DQ scheduler may try to achieve. We find that our proposed DQ implementation may fail to achieve these alternative objectives, and hence, we remedy this shortfall by proposing the Priority- Based Dual-Queue scheduler, which is made up of multiple DQs differentiated by the priority classes of connections. That is, each priority class is handled in a separate DQ. The Priority-Based Dual-Queue scheduler ensures connections that belong to the highest priority class are served ahead of connections that belong to lower priority classes at all times, even when there are changes in the priority class of connections in the system. Lastly, we investigate the benefits of carrying out the DQ scheduling for both the DL and UL of an 802.16 network jointly. We first investigate a scenario where the network consists of only one-directional connections. We propose a joint scheme that is able to maximise the number of satisfied one-directional connections in the network. We then extend our investigation to another scenario where the network consists of bi-directional sessions, such as Voice over IP and video conferencing. In this case, we propose two joint schemes, which are able to maximise the number of satisfied bi-directional sessions. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1363601 / Thesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2009

ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California / A critical element of the proposed iNET architecture is the development of a telemetry network that provides two-way communication between multiple nodes on both the ground and in the air. Conventional airborne telemetry is based on IRIG-106 Chapter 4 and provides only a serial streaming data path from the aircraft to the ground. The network-centric architecture of iNET requires not only a duplex communication link between the ground and the test article, but also a communication link that provides higher bandwidth performance, higher spectrum efficiency, and a transport environment that is capable of fully packetized Internet Protocol. This paper describes the development path followed by TTC in the implementation of its nXCVR-2000G, an OFDM 802-11a-based iNET-ready IP transceiver.

Αντικείμενο της παρούσας διπλωματικής εργασίας είναι η ολοκληρωμένη παρουσίαση του προτύπου IEEE 802.16, που χρησιμοποιείται από το σύγχρονο ασύρματο ευρυζωνικό δίκτυο με την εμπορική ονομασία WiMAX και η εκπόνηση μίας μελέτης ράδιο-κάλυψης για τον προσδιορισμό των τεχνικών παραμέτρων, ώστε η εφαρμογή ενός τέτοιου δικτύου να προσφέρει τη βέλτιστη ράδιο-κάλυψη. Αρχικά γίνεται μια εισαγωγική παρουσίαση των ασύρματων τεχνολογιών, που χρησιμοποιούνται στην Ελλάδα για την πρόσβαση στις ευρυζωνικές υπηρεσίες και παρατίθενται στατιστικά στοιχεία, που απεικονίζουν την κατάσταση που επικρατή στον ελλαδικό χώρο. Στη συνέχεια καταγράφεται η ανάπτυξη και η εξέλιξη του προτύπου IEEE 802.16 και γίνεται αναφορά στο ρόλο που διαδραματίζουν το WiMAX Forum και οι επίσημοι κατασκευαστές. Προχωρώντας, εμβαθύνουμε περισσότερο με την παρουσίαση της αρχιτεκτονικής των δικτύων WiMAX, αλλά και των τεχνικών χαρακτηριστικών και των προδιαγραφών, που αυτά προσφέρουν και τα έχουν καταστήσει πρωτοπόρα στην εμπορική αγορά των ασύρματων επικοινωνιών. Τέλος, εκπονούμε μία λεπτομερή μελέτη για τη βέλτιστη ράδιο-κάλυψη σε μία συγκεκριμένη γεωγραφική περιοχή, σύμφωνα με τις προδιαγραφές της τεχνολογίας WiMAX και προσδιορίζουμε την ποιότητα των υπηρεσιών που θα μπορεί να προσφέρει το δικτύου WiMAX, στηριζόμενοι στα αποτελέσματα της μελέτης. / The subject of this thesis is the complete presentation of the standard IEEE 802.16, which is used by the modern wireless broadband network under the trade name WiMAX and the conduction of a radio coverage study to determine the technical parameters, so that the implementation of such a network can offer the optimal radio coverage. First, we make an introduction of wireless technologies used for access to broadband services and we present statistics that reflect the real market condition in Greece. Then we record the development and the progress of the IEEE 802.16 standard and we also make a small reference to the role of the WiMAX Forum and the official manufacturers. In depth, we analyze the architecture of WiMAX networks and all the technical features and specifications, which make the WiMAX technology a pioneer and have consolidate it in the market of wireless communications. Finally, we work out a detailed study on the optimal radio coverage in a specific geographic area, in accordance with the requirements of WiMAX technology and furthermore we estimate the quality of services that can be provided by the WiMAX network, relying on the results of the simulation.

University of the Witwatersrand Faculty of Engineering and the Built Environment School of Information and Electrical Engineering / Mobile Broadband is now more of a necessity than a luxury, especially amongst the younger generation, irrespective of where they live. Mobile WiMax and LTE, the latest and fastest Mobile Broadband technologies, mark significant improvements over 3G networks because they use IP (Internet Protocol) end-to-end. To end-users, this means faster network speeds, better quality services, and increased coverage area. To the Network Operators, this means simplified network architectures, efficient use of resources, and improved security. In this report, the different issues and challenges related to deploying Mobile WiMax (802.16e or 802.16m) in rural South Africa, were identifed and explored. In this project, Atoll, SONAR, and Touch Point analysis tools were used to determine which Mobile Broadband technology is economically and technically suited for rural South Africa. It was found that LTE yields superior performance results than WiMax, which in turn yields superior performance results to all other existing 3G technologies. However it will take time for LTE to reach rural areas therefore WiMax can be considered as a solution to extend Broadband services to rural South Africa and thus assist in bridging the digital divide. Recommendations on how best to deploy Mobile WiMax are made based on observations made from the experimental work. / MT2017

Se plantea la posibilidad de migrar a IEEE 802.16 (WiMAX) en los lugares donde se usa WiFi como solución tecnológica ya que la primera es una tecnología inalámbrica diseñada para redes MAN que no solo permite conectividad inalámbrica sino también velocidades de banda ancha; lográndose llenar los vacíos que deja WiFi. De esta manera se estaría fomentando el acceso universal el cual es un componente en la estrategia del desarrollo de las telecomunicaciones en el Perú. / Tesis

Multimedia applications in wireless communication have shown notable increases over recent years. Specifically, Quality of Service (QoS) has become an important support mechanism in the context of a variety of applications which utilize network resources. The IEEE 802.16 standard for Wireless Metropolitan Area Networks (WirelessMAN) provides a complete QoS control structure designed to enable flow isolation and service differentiation over the common wireless interface. Although the media access control (MAC) mechanisms defined in this standard can offer predefined QoS provisioning on a pre-connection basis (additionally, many algorithms have been addressed to support QoS guarantees for various kinds of applications), the design for a stable, efficient and flexible MAC scheduling algorithm for such QoS provisioning still remains to be discovered. In this paper, we propose a QoS control scheme, Efficient Bandwidth Allocation (EBA), for the WirelessMAN system. Notably, this schedule enables predefined service parameters to control the service provided for each uplink connection and it provides each connection with different service opportunities such that the BS could allocate the most suitable bandwidth constantly for each connection with the various QoS parameters. Moreover, through MAC layer resource allocation, the proposed algorithm is capable of providing QoS guarantee for the SSs under different distance.

Thèse de doctorat : Informatique : Evry-Val d'Essonne : 2008. / Titre provenant de l'écran-titre.