Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs

Bibliographic Details
Main Author:	Zhou, Wenjie
Language:	English
Published:	The Ohio State University / OhioLINK 2015
Subjects:	Computer Science
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=osu1448619777

id	ndltd-OhioLink-oai-etd.ohiolink.edu-osu1448619777
record_format	oai_dc
spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-osu14486197772021-08-03T06:34:09Z Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs Zhou, Wenjie Computer Science Enterprise Wireless LANs (EWLANs) have increasingly become prevalent in recentyears. They are widely deployed in public places, such as universities, malls, airports andoffice buildings, providing Internet connections. On the other hand, there is an explosiveincrease in demand for wireless service as mobile devices such as smart phones and tabletshave gained immense popularity. Currently, the widely deployed 802.11 standard is shownto have low channel efficiency and suffers from well known problems, such as hiddenterminal problem and exposed terminal problem. To meet the growing demand for wirelessdata, it is time to move away from the age-old paradigm of prohibiting interfering nodesfrom transmissions.We first present Rapid Concurrent Transmission Coordination (RCTC), a fast and lowoverhead signaling mechanism based on Pseudo-random Noise (PN) sequences to enablemulti-modal operation of wireless links in a distributed channel access setting to supportconcurrent transmissions with full duplex radios. We look beyond a node pair and explorehow a network can best utilize the full duplex capability.In enterprise networks, access points (AP) are connected to the backbone network,which allows APs to communicate with each other. We takes advantage of the backbonenetwork and seek opportunities for concurrent transmissions to increase the performanceof EWLANs with three different techniques: DOMINO, BBN and BASIC.DOMINO is a centralized relative scheduling scheme for channel access in enterprisenetworks. Existing centralized packet scheduling algorithms suffer from the requirementof tight time synchronization and are thus difficult to use in practice. We introduce RelativeScheduling: a technique for triggering wireless transmissions through other wireless trans-missions in a domino-like fashion, thus making tight time synchronization unnecessary.Today’s EWLANs are comprised of densely deployed APs. To take advantage of that,we present Blind Beamforming and Nulling (BBN), an interference nulling scheme thatleverages the high density of access points to enable multiple mobile devices to transmitsimultaneously to multiple access points (APs), all within a single collision domain. BBNscales the uplink throughput linearly with the number of clients.Through proactive management of interference among multiple colliding packets, highthroughput wireless systems can be designed. We propose BASIC, a lightweight multi-useruplink transmission strategy that does not require tight synchronization. In BASIC, everyclient transmits with a data rate that is able to tolerate interference from other transmissions.Decoded packets are shared through the backbone network and their interference can betherefore cancelled.RCTC and DOMINO are suitable for networks where the backbone network capacityis limited since they generate the least amount of traffic. BASIC is suitable for networkswith small number of APs in a single collision domain while BBN is best in networks withhigh density of APs. This thesis discusses these schemes in detail and presents techniquesto address the challenges in their practical implementations. 2015 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1448619777 http://rave.ohiolink.edu/etdc/view?acc_num=osu1448619777 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Computer Science
spellingShingle	Computer Science Zhou, Wenjie Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
author	Zhou, Wenjie
author_facet	Zhou, Wenjie
author_sort	Zhou, Wenjie
title	Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
title_short	Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
title_full	Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
title_fullStr	Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
title_full_unstemmed	Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs
title_sort	cross mac-phy layer channel access mechanism for enterprise wireless lans
publisher	The Ohio State University / OhioLINK
publishDate	2015
url	http://rave.ohiolink.edu/etdc/view?acc_num=osu1448619777
work_keys_str_mv	AT zhouwenjie crossmacphylayerchannelaccessmechanismforenterprisewirelesslans
_version_	1719439337086517248

Cross MAC-PHY Layer Channel Access Mechanism for Enterprise Wireless LANs

Similar Items