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Agile and robust resource management in CSMA wireless networks
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Title
Agile and robust resource management in CSMA wireless networks
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ETD_1413
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051062
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eng
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theses
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Electrical and Computer Engineering
Subject
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(authority = ETD-LCSH)
Topic
Wireless LANs
Abstract
With the recent push towards wireless broadband, and user migration towards mobile devices, it has become imperative for wireless networks to support higher network capacity, increased battery life, and greater mobility. While a combination of both local- and wide-area wireless technologies will be needed to meet these requirements, we believe that carrier-sense multiple-access (CSMA) wireless networks, if designed well, can play an important role in the future. Traditional CSMA wireless networks, which form the basis for today's ubiquitous wireless LAN technology--IEEE 802.11 or WiFi, cannot satisfy the stated requirements mainly because they lack efficient resource management (or resource parameter adaptation) techniques. Several fundamental characteristics of these networks, and practical implementation challenges, also limit the applicability of solutions from other domains. Taken together, these considerations force us to fundamentally re-think the design of resource parameter adaptation for CSMA wireless networks.
In this dissertation, we first identify that, to satisfy the requirements, resource management techniques for CSMA wireless networks should possess two fundamental, but conflicting properties, agility, and robustness. Briefly, to provide increased bandwidth to mobile users, agile solutions are required that exploit opportunities for improved performance; at the same time, solutions cannot afford to compromise on link robustness. In addition, we realize that striking this trade-off effectively calls for different solutions in indoor and outdoor environments. To prove these hypotheses, we present the design and implementation of two resource management frameworks, Symphony and Sonata, for indoor and outdoor environments respectively. Indoors, Symphony increases network capacity and battery life for mobile clients by addressing the classical problem of joint, per-link, transmit power control and rate adaptation. For improved robustness, Symphony uses novel mechanisms based on measuring the expected transmission time (ETT), and the utility of RTS/CTS frames, while relying on a learning approach to converge quickly to the right resource parameter choice. Outdoors, the Sonata framework introduces a novel and fundamental tradeoff between directionality and base station diversity for uplink transmissions. Using a new location-based approach for improved parameter convergence, Sonata is able strike the agility-robustness tradeoff effectively.
Together, these frameworks prove that, achieving the right balance between agility and robustness can enable CSMA wireless networks to transition to the wireless broadband era.
In this dissertation, we first identify that, to satisfy the requirements, resource management techniques for CSMA wireless networks should possess two fundamental, but conflicting properties, agility, and robustness. Briefly, to provide increased bandwidth to mobile users, agile solutions are required that exploit opportunities for improved performance; at the same time, solutions cannot afford to compromise on link robustness. In addition, we realize that striking this trade-off effectively calls for different solutions in indoor and outdoor environments. To prove these hypotheses, we present the design and implementation of two resource management frameworks, Symphony and Sonata, for indoor and outdoor environments respectively. Indoors, Symphony increases network capacity and battery life for mobile clients by addressing the classical problem of joint, per-link, transmit power control and rate adaptation. For improved robustness, Symphony uses novel mechanisms based on measuring the expected transmission time (ETT), and the utility of RTS/CTS frames, while relying on a learning approach to converge quickly to the right resource parameter choice. Outdoors, the Sonata framework introduces a novel and fundamental tradeoff between directionality and base station diversity for uplink transmissions. Using a new location-based approach for improved parameter convergence, Sonata is able strike the agility-robustness tradeoff effectively.
Together, these frameworks prove that, achieving the right balance between agility and robustness can enable CSMA wireless networks to transition to the wireless broadband era.
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electronic resource
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xiv, 108 p. : ill.
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Ph.D.
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Includes bibliographical references (p. 96-106)
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by Kishore Ramachandran
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Ramachandran
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Kishore Ramachandran
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Marco
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Marco Gruteser
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Raychaudhuri
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Dipankar
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Dipankar Raychaudhuri
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Predrag Spasojevic
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Kokku
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Ravi
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Ravi Kokku
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Rutgers University
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Graduate School - New Brunswick
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2009
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2009-01
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Rutgers University Electronic Theses and Dissertations
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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doi:10.7282/T3QJ7HHQ
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ETD doctoral
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Non-exclusive ETD license
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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