{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80935"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80935","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Improving Client Performance and Energy-Efficiency in Current and Next-Generation Wireless LANS","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Saha, Swetank Kumar; 0000-0002-2541-1856"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Koutsonikolas, Dimitrios","Computer Science and Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-10-29T16:48:17Z","date_published":"2019-10-29T16:48:17Z","updated_at":"2026-07-27T19:05:28Z","subjects":["computer science","computer engineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80935","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Koutsonikolas, Dimitrios","Computer Science and Engineering"]},{"key":"dc:creator","label":"Author","values":["Saha, Swetank Kumar; 0000-0002-2541-1856"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-10-29T16:48:17Z","2019","2019-08-09 22:31:29"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["computer science","computer engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80935"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","The IEEE 802.11 set of Wireless Local Area Network (WLAN) technologies, colloquially referred to as WiFi, has become the most favored choice for providing indoor connectivity in home and enterprise settings. Although the latest iteration of 802.11 standards promises Gigabit data rates at the PHY/MAC layers, there are still several significant challenges towards realizing the dream of high-speed, always-on and reliable connectivity. Further, cellular operators are looking at utilizing the unlicensed band used by WiFi creating entirely new co-existence challenges which the WLANs were never designed to handle. In addition, due to the widespread adoption of WiFi in battery-powered devices like smartphones, understanding the energy-consumption of these technologies has become ever more critical today. This dissertation looks at several problems that WLANs face today and will encounter in the future in the context of both performance and energy-efficiency. Through extensive measurements, using both commercial off-the-shelf (COTS) hardware and a configurable software defined radio (SDR)-based testbed, we first characterize the client performance and energy-efficiency in various types of WLANs and identify multiple issues across different wireless access technologies. We then use the insights from the measurement studies to design systems and solutions addressing the identified challenges. Specifically, we make contributions in the following three areas: (1) We first look at the currently widely deployed WLAN standards: 802.11n/ac. Although the performance of these technologies has been studied extensively, little attention has been given to the energy-efficiency aspect, especially in the context of smartphones. Towards this end, we first study the power-performance tradeoffs of the new PHY/MAC features introduced by 802.11n/ac. Next, we expand our view and model the total network energy which includes both transmission and network stack-traversal components. (2) Next we look at the recently introduced LTE-U (Unlicensed)/LAA (License Assisted Access) link aggregation techniques, which use LTE in the unlicensed 5 GHz bands and are being actively deployed by mobile operators for increased capacity. This poses a challenge for fair-coexistence between LTE and the existing users of this part of the spectrum (mainly 802.11n/ac based WLANs). To address this challenge, we present DeMiLTE – a system for commodity enterprise WiFi APs that detects, quantifies, and reacts to LTE interference. Our evaluation results show that DeMiLTE can provide up to 110% throughput gains and alleviate client disruption caused by LTE interference. (3) Finally, we turn our attention to the Millimeter-Wave (mmWave) technology, standardized as IEEE 802.11ad, for designing the next-generation of WLANs that can meet the predicted drastic growth in wireless data traffic.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Improving Client Performance and Energy-Efficiency in Current and Next-Generation Wireless LANS"]}]}],"canonical_facts":{"dc:contributor":["Koutsonikolas, Dimitrios","Computer Science and Engineering"],"dc:creator":["Saha, Swetank Kumar; 0000-0002-2541-1856"],"dc:date":["2019-10-29T16:48:17Z","2019","2019-08-09 22:31:29"],"dc:description":["Ph.D.","The IEEE 802.11 set of Wireless Local Area Network (WLAN) technologies, colloquially referred to as WiFi, has become the most favored choice for providing indoor connectivity in home and enterprise settings. Although the latest iteration of 802.11 standards promises Gigabit data rates at the PHY/MAC layers, there are still several significant challenges towards realizing the dream of high-speed, always-on and reliable connectivity. Further, cellular operators are looking at utilizing the unlicensed band used by WiFi creating entirely new co-existence challenges which the WLANs were never designed to handle. In addition, due to the widespread adoption of WiFi in battery-powered devices like smartphones, understanding the energy-consumption of these technologies has become ever more critical today. This dissertation looks at several problems that WLANs face today and will encounter in the future in the context of both performance and energy-efficiency. Through extensive measurements, using both commercial off-the-shelf (COTS) hardware and a configurable software defined radio (SDR)-based testbed, we first characterize the client performance and energy-efficiency in various types of WLANs and identify multiple issues across different wireless access technologies. We then use the insights from the measurement studies to design systems and solutions addressing the identified challenges. Specifically, we make contributions in the following three areas: (1) We first look at the currently widely deployed WLAN standards: 802.11n/ac. Although the performance of these technologies has been studied extensively, little attention has been given to the energy-efficiency aspect, especially in the context of smartphones. Towards this end, we first study the power-performance tradeoffs of the new PHY/MAC features introduced by 802.11n/ac. Next, we expand our view and model the total network energy which includes both transmission and network stack-traversal components. (2) Next we look at the recently introduced LTE-U (Unlicensed)/LAA (License Assisted Access) link aggregation techniques, which use LTE in the unlicensed 5 GHz bands and are being actively deployed by mobile operators for increased capacity. This poses a challenge for fair-coexistence between LTE and the existing users of this part of the spectrum (mainly 802.11n/ac based WLANs). To address this challenge, we present DeMiLTE – a system for commodity enterprise WiFi APs that detects, quantifies, and reacts to LTE interference. Our evaluation results show that DeMiLTE can provide up to 110% throughput gains and alleviate client disruption caused by LTE interference. (3) Finally, we turn our attention to the Millimeter-Wave (mmWave) technology, standardized as IEEE 802.11ad, for designing the next-generation of WLANs that can meet the predicted drastic growth in wireless data traffic.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80935"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["computer science","computer engineering"],"dc:title":["Improving Client Performance and Energy-Efficiency in Current and Next-Generation Wireless LANS"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:28Z"}