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Dissertations / Theses on the topic 'CSMA'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Castiel, Eyal. "Study of QB-CSMA algorithms." Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0038.

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La performance des réseaux sans fil où les utilisateurs partagent l'air comme moyen de communication est fortement limitée par le phénomène d'interférence électromagnétique. En effet, deux utilisateurs proches qui communiquent sur la même fréquence verront leurs ondes interférer, ce qui peut entraîner la perte de l'information transmise. Ainsi, il est indispensable de mettre en place des protocoles d'accès visant à limiter l'interférence en choisissant de manière efficace les utilisateurs autorisés à émettre à chaque instant. D'un point de vue scientifique, il s'agit d'un problème difficile qu

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2

JAIN, NITIN. "MULTICHANNEL CSMA PROTOCOLS FOR AD HOC NETWORKS." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin995471534.

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3

Tsertou, Athanasia. "Modelling interference in a CSMA/CA wireless network." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/14589.

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Initially, a systematic characterisation of all the possible ways in which two communicating pairs of nodes can interfere with each other is made. Using this as a building block and assuming independence of the stations, an estimate for the network throughput can be derived. The latter proves to be quite accurate for symmetric networks and manages to follow the performance trends in an arbitrary network. Following this, a more detailed Markovian-based mathematical model is proposed for the analysis of the hidden node case. This approach does not rely on common assumptions, such as renewal theo

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4

Forss, Jonas. "Real-Time Communication over Broadcast Networks." Thesis, University of Skövde, Department of Computer Science, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-308.

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<p>Today the utilization of all kind of multimedia services in networks increases and due to this demand for real-time communication gets higher for every day. One of the most common protocols used today is Ethernet. It is of interest to find real-time protocols that are useful together with already existing protocols since it is expensive to rebuild the network infrastructure. Several new protocols have been proposed to solve the upcoming problems.</p><p>The objective of this project is to make an inventory and a comparison between Ethernet and these new protocols. During this project four di

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5

Ching, Kai-Sang. "Priority CSMA schemes for integrated voice and data transmission." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28372.

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Priority schemes employing the inherent properties of carrier-sense multiple-access (CSMA) schemes are investigated and then applied to the integrated transmission of voice and data. A priority scheme composed of 1-persistent and non-persistent CSMA protocols is proposed. The throughput and delay characteristics of this protocol are evaluated by mathematical analysis and simulation, respectively. The approach of throughput analysis is further extended to another more general case, p-persistent CSMA with two persistency factors, the throughput performance of which had not been analyzed before.

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6

Ramesh, Chithrupa, Henrik Sandberg, and Karl Henrik Johansson. "Stability analysis of multiple state-based schedulers with CSMA." KTH, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-111461.

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In this paper, we identify sufficient conditions for Lyapunov Mean Square Stability (LMSS) of a contention-based network of first-order systems, with state-based schedulers. The stability analysis helps us to choose policies for adapting the scheduler threshold to the delay from the network and scheduler. We show that three scheduling laws can result in LMSS: constant-probability laws and additively increasing or decreasing probability laws. Our results counter the notions that increasing probability scheduling laws alone can guarantee stability of the closed-loop system, or that decreasing pr

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7

Horton, Remy A. "Distributed and deterministically maintained transmission alignment in csma protocols." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549440.

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8

Weitzen, Christopher James. "Service differentiation using managed sleep in CSMA/CA networks." Winston-Salem, NC : Wake Forest University, 2009. http://dspace.zsr.wfu.edu/jspui/handle/10339/44746.

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9

Medapalli, Kameswara Rao. "Design, analysis and optimization of CSMA/CA based wireless networks /." May be available electronically:, 2006. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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10

Mulligan, Jeanette. "A Performance Analysis of a CSMA Multihop Packet Radio Network." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36779.

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In a packet radio network, multiple terminals broadcast information over a shared communications medium. Messages are transmitted from a source terminal to a destination terminal over multiple relays or hops. The actions of one terminal in the network directly affect the actions of other terminals within its range.<P> The analysis of packet radio networks is complex because system performance depends on the topology of the terminals in the network along with the random access protocol used. Researchers have been unable to model a packet radio network in its most general form. In t

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11

Li, Jing. "OFDM and p-Persistent CSMA/CD-based Indoor PLC Networks." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1234896618.

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12

Kaynia, Mariam. "Performance Analysis of ALOHA and CSMA in Spatially Distributed Wireless Networks." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9580.

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<p>In this thesis the performance of the ALOHA and CSMA MAC protocols are analyzed in spatially distributed wireless networks. The main measurement metric used is probability of outage, a metric that is referred to in most of the related research done in this field, but has not been treated in detail thus far. Some of the research done on other performance metrics such as transmission capacity, throughput, bit error rate, spatial reuse and delay are also noted and described briefly in this report. In our system model, users/packets arrive randomly in space and time according to a Poisson poin

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13

Plönnigs, Jörn. "Control network performance engineering qualitätsorientierter Entwurf von CSMA-Netzwerken der Automation." Dresden Vogt, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3009957&prov=M&dok_var=1&dok_ext=htm.

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14

Yuxiang, Yang, Dang Xiaoyu, and Zhou Tingxian. "PROPOSAL OF POLLED-CSMA PROTOCOL FOR AN AD HOC SCADA SYSTEM." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606484.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>In this paper we introduce an ad hoc distributed supervisory control and data acquisition (SCADA) system, which covers two types of traffic, a small number of slave stations with stream traffic and much larger number of slave stations with burst traffic. To improve the system’s real-time transmission and channel allocation efficiency, a MAC scheme, named Polled-CSMA, is designed by integrating the merits of polling and CSMA protocols. Extensive anal

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15

Yang, Tao. "Characterization of the fundamental properties of wireless CSMA multi-hop networks." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12416.

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A wireless multi-hop network consists of a group of decentralized and self-organized wireless devices that collaborate to complete their tasks in a distributed way. Data packets are forwarded collaboratively hop-by-hop from source nodes to their respective destination nodes with other nodes acting as intermediate relays. Existing and future applications in wireless multi-hop networks will greatly benefit from better understanding of the fundamental properties of such networks. In this thesis we explore two fundamental properties of distributed wireless CSMA multi-hop networks, connectivity and

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16

Mawlawi, Baher. "Random access for dense networks : Design and Analysis of Multiband CSMA/CA." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0112/document.

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Les protocoles de communications à accès aléatoires sont des candidats prometteurs pour les futurs systèmes de communications sans fil dédiés aux applications machine à machine (M2M). Ces méthodes d’accès sont généralement basées sur des techniques d'accès aléatoires mettant en œuvre des concepts simples de sondage de canal et de report de la transmission pour réduire les collisions, tout en évitant l'utilisation d'ordonnanceurs complexes. Parmi les différents protocoles, Carrier sense multiple access/collision avoidance with a Request-To-Send/Clear-To-Send (CSMA/CA-RTS/CTS) est un protocole q

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17

Lofcali, Mehmet N. "A specification of a CSMA/CD protocol using systems of communicating machines." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26260.

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18

VASQUES, Thiago Lara. "Estimação de vazão baseada em modelagem e simulação do controle de acesso ao meio em redes PLC." Universidade Federal de Goiás, 2010. http://repositorio.bc.ufg.br/tede/handle/tde/959.

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Made available in DSpace on 2014-07-29T15:08:15Z (GMT). No. of bitstreams: 1 Dissertacao Thiago Lara Vasques.pdf: 2258919 bytes, checksum: bdbbde461e7636388d4795c9556eb77f (MD5) Previous issue date: 2010-08-18<br>We carried out a study on throughput estimation based on analysis and modeling of the medium access control in HomePlug 1.0 standard based PLC networks. The data communication using electrical energy wires has advantages such as presenting characteristics of ubiquity due to the existent infrastructure, but faces significant obstacles as fading and noise. The main standard of this ki

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19

Corneliussen, Jon Even. "The Optimal Packet Duration of ALOHA and CSMA in Ad Hoc Wireless Networks." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9911.

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<p>In this thesis the optimal transmission rate in ad hoc wireless networks is analyzed. The performance metric used in the analysis is probability of outage. In our system model, users/packets arrive randomly in space and time according to a Poisson point process, and are thereby transmitted to their intended destinations using either ALOHA or CSMA as the MAC protocol. Our model is based on an SINR requirement, i.e., the received SINR must be above some predetermined threshold value, for the whole duration of a packet, in order for the transmission to be considered successful. If this is not

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20

Ishigaki, Masahiro. "Studies on Modeling and Performance Analysis of Communication Systems with Improved CSMA/CD." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150263.

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21

Lopes, Luis Filipe Amaral. "Esquemas de controlo de acesso ao meio para sistemas CSMA/CA p-persistente." Master's thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/2534.

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Dissertação apresentada para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores, pela Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia<br>Este trabalho descreve os passos iniciais no sentido de caracterizar formalmente os protocolos de acesso ao meio baseados em heurísticas propostos para redes ad hoc sem os. Este método, denominado método de análise de heurísticas de acesso ao meio, permite caracterizar a função de utilidade de acesso ao meio de um nó, a qual está relacionada com o seu débito útil, tal como é provado experimentalmente neste trabalho.

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22

Liu, Quan. "Multi-band OFDM and p-Persistent CSMA/CD-based Indoor Power Line Communication (PLC) Systems." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1265984789.

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23

Lee, Jongdae. "Performance enhancement of CSMA/CA in powerline communications under heavy traffic and hidden node conditions." [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0022857.

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24

Navalekar, Abhijit C. "Distributed Digital Radios for Land Mobile Radio Applications." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-dissertations/4.

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The main objective of this dissertation is to develop the second generation of Distributed Digital Radio (DDR) technology. A DDR II modem provides an integrated voice/data service platform, higher data rates and better throughput performance as compared to a DDR I modem. In order to improve the physical layer performance of DDR modems an analytical framework is first developed to model the Bit Error Rate (BER) performance of Orthogonal Frequency Division Multiplexing over Frequency Modulation (OFDM/FM) systems. The use of OFDM provides a spectrally efficient method of transmitting data over LM

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25

Kangude, Shantanu. "CSMA with Implicit Scheduling through State-keeping: A Distributed MAC Framework for QoS in Broadcast LANs." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-05132004-132109/unrestricted/kangude%5Fshantanu%5F200407%5Fphd.pdf.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2005. Directed by John Copeland.<br>Copeland, John, Committee Chair ; Owen, Henry, Committee Member ; Sivakumar, Raghupathy, Committee Member ; Lanterman, Aaron, Committee Member ; Dos Santos, Andre, Committee Member. Includes bibliographical references.

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26

Abukharis, Salim H. S. "Accurate cross-layer modelling and evaluation of IEEE 802.11e using a differentiated p-persistent CSMA protocol." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4793/.

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With the extensive deployment of 802.11 wireless local area networks (WLANs) and the need for better quality of service (QoS), the 802.11e MAC with service differentiation was developed. In practical WLAN deployments, the capture effect has been shown to enhence the throughput performance of the network. Analysing the effect of fading and near–far effect on the performance of 802.11 is a fundamental consideration in practical situations since the wireless channels are error-prone. Developing an accurate closed form solution of the throughput/delay is a crucial task for the network planning and

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27

Yipeng, Wang. "Implementation of the WirelessHART MAC Layer in the OPNET Simulator." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-19912.

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Industrial wireless sensor network (IWSN) is an application area of WSN used in industrial process monitoring and control with strict time and reliability requirement. WirelessHART standard is the first international standard for IWSN approved by International Electrotechnical Commission (IEC). This is worthwhile to implement this standard on simulator platform. Based on the study of WirelessHART standard, this thesis set up a primary implementation of the MAC layer of WirelessHART standard. To our best knowledge, this is the first comprehensive implementation of WirelessHART using OPNET simul

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28

Moslehi, Farhood. "Simulation of the MAC Portion of IEEE 802.11 and Bursts of Errors for Wireless Data Networks." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36936.

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The focus of this research is to investigate the effects of bursts of errors and packet collisions on the performance of the medium access control (MAC) portion of the IEEE 802.11 wireless local area network (LAN) protocol.An important ingredient in rapid expansion of wireless networks is the seamless transition between wired and wireless systems. The IEEE standards group in charge of developing the widely used IEEE 802.3 LAN standard has developed the IEEE 802.11 wireless LAN standard. IEEE 802.11 remains hidden from the upper levels of the network, thus allowing a seamless transition between

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29

CHEN, YUNLI. "PERFORMANCE ANALYSIS AND ENHANCEMENT OF MAC PROTOCOLS FOR IEEE 802.11 WLANS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1098856121.

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30

Cawood, Andrew Dudley. "Adaptation, optimisation and simulation of the CSMA/CA protocol for a low earth orbit satellite UHF link." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1608.

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31

Wu, Jingqi. "Cooperative Jamming in Wireless Networks - Turning Attacks into Privacy Protection." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/885.

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Generally, collisions between packets are undesired in wireless networks. We design this scheme, Cooperative Jamming in Wireless Networks (CJWN), to make use of collision to protect secret DATA packets from being sniffed by a nearby eavesdropper. We are intending to greatly increase the Packet Error Rate (PER) at the eavesdropper when the PER at the receiver is maintained at an acceptable level. This scheme is not intended to completely take the place of various encryption/decryption schemes which are working based on successfully received packets. Adding CJWN to the popular CSMA/CA adopted in

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32

Yang, Zhenxiang. "Entwicklung eines Verfahrens zur Emulation der Medienzugriffssteuerung in Wireless LAN." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11482123.

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33

Tang, Yong. "Performance Study for Co-existing Wi-Fi and ZigBee Systems and Design of Interoperability Techniques." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23169.

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Wireless local area networks (WLANs) and wireless sensor networks (WSNs) technologies have been comprehensively developed and deployed during recent years. Since commercial WLAN and WSN products share the same free of license frequency band, the low power, low rate ZigBee based WSNs are vulnerable to the interference from Wi-Fi WLANs. Therefore, it is important to evaluate the performance of ZigBee WSNs that are subjected to interference generated by collocated Wi-Fi WLANs and to design effective counter-measuring techniques should performance improvement is needed. In this research, a versati

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34

Haque, Syed E. "Efficient GTS Allocation Schemes for IEEE 802.15.4." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/cs_theses/75.

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IEEE 802.15.4 is a standard defined for wireless sensor network applications with limited power and relaxed throughput needs. The devices transmit data during two periods: Contention Access Period (CAP) by accessing the channel using CSMA/CA and Contention Free Period (CFP), which consists of Guaranteed Time Slots (GTS) allocated to individual devices by the network coordinator. The GTS is used by devices for cyclic data transmission and the coordinator can allocate GTS to a maximum of only seven devices. In this work, we have proposed two algorithms for an efficient GTS allocation. The first

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35

Kumar, Nishant. "MAC and Physical Layer Design for Ultra-Wideband Communications." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9934.

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Ultra-Wideband has recently gained great interest for high-speed short-range communications (e.g. home networking applications) as well as low-speed long-range communications (e.g. sensor network applications). Two flavors of UWB have recently emerged as strong contenders for the technology. One is based on Impulse Radio techniques extended to direct sequence spread spectrum. The other technique is based on Orthogonal Frequency Division Multiplexing. Both schemes are analyzed in this thesis and modifications are proposed to increase the performance of each system. For both schemes, the issue o

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36

Polumuru, Pushpa. "Networking of UAVs Using 802.11s." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505276/.

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The thesis simulates the problem of network connectivity that occurs due to the dynamic nature of a network during flight. Nine nodes are provided with initial positions and are flown based on the path provided by leader-follower control algorithm using the server-client model. The application layer provides a point to point connection between the server and client and by using socket programming in the transport layer, a server and clients are established. Each node performs a neighbor discovery to discover its neighbors in the data link layer and physical layer performs the CSMA/CA using RTS

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37

Ganesh, Rajaganesh 1987. "SQ-CSMA : universally lowering the delay of queue-based CSMA/CA." Thesis, 2010. http://hdl.handle.net/2152/26517.

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Recent works show that, by incorporating queue length information, CSMA/CA multiple access protocols can achieve maximum throughput in general ad-hoc wireless networks. In all of these protocols, the aggressiveness with which a link attempts to grab the channel is governed solely by its own queue, and is independent of the queues of other interfering links. While this independence allows for minimal control signaling, it results in schedules that change very slowly. This causes starvation and delays - especially at moderate to high loads. In this work we add a very small amount of signaling -

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38

Boyana, Murat A. "Pseudo-Bayesian stability of CSMA and CSMA/CD local area networks." Thesis, 1988. http://hdl.handle.net/10945/23371.

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Approved for public release; distribution is unlimited.<br>This thesis investigates the stability of the random multiaccess protocols, slotted CSMA and slotted CSMA/CD, utilizing one power level and two power levels to create beneficial power capture effect. Use of more than two equally spaced power levels provides no significant improvement in the throughput achievable when realistic capture thresholds are considered. The investigation centers on a technique known as pseudo-Bayesian stability. Another task of this thesis is to stabilize multichannel slotted CSMA and slotted CSMA/CD with

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39

何明耀. "A study on the interconnection of CSMA and CSMA/CD networks." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/96988024342183460636.

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40

"TCP Reno over adaptive CSMA." 2010. http://library.cuhk.edu.hk/record=b5894411.

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Chen, Wei.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2010.<br>Includes bibliographical references (leaves 64-67).<br>Abstracts in English and Chinese.<br>Dedication --- p.iv<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Motivation --- p.1<br>Chapter 1.2 --- Contributions --- p.2<br>Chapter 1.3 --- Thesis Organization --- p.3<br>Chapter 2 --- Related Work --- p.4<br>Chapter 2.1 --- Previous Work on Rate Control and link Scheduling in Wireless Networks --- p.4<br>Chapter 2.2 --- Previous Work on Multi-connection TCP --- p.6<br>Chapter 2.3 --- Previous Work on AQM -

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Moraes, Ricardo Alexandre Reinaldo de. "Supporting Real-Time Communication in CSMA-Based Networks : the VTP-CSMA Virtual Token Passing Approach." Doctoral thesis, 2007. http://hdl.handle.net/10216/11298.

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Moraes, Ricardo Alexandre Reinaldo de. "Supporting Real-Time Communication in CSMA-Based Networks : the VTP-CSMA Virtual Token Passing Approach." Tese, 2007. http://hdl.handle.net/10216/11298.

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43

Phung, Van Phuc Trach. "Throughput analysis of CSMA/CF systems." Thesis, 1987. http://spectrum.library.concordia.ca/5426/1/ML50103.pdf.

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Tzung-HanTu and 塗宗翰. "CSMA/CA-RBTv : An Enhanced Collision Avoidance CSMA/CA-based Media Access Protocol over the M2M Communication Environment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/35qrjy.

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碩士<br>國立成功大學<br>資訊工程學系<br>103<br>Machine-to-Machine (M2M) communication is a machine-independent communication paradigm that can facilitate wired and wireless communications without the need for human intervention. However, as the number of network devices increases, the occurrence of collisions rises, which results in the efficiency of the MAC layer protocol being degraded and the power consumption being increased. To resolve this problem, this thesis proposes an enhanced IEEE 802.11 CSMA/CA media access scheme designated as CSMA/CA-RBTv, in which RBT denotes the Registered Backoff Time and v

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Gurusamy, Vijay. "Service differentiation using p-persistent CSMA/CA." 2005. http://digital.library.okstate.edu/etd/umi-okstate-1629.pdf.

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46

"Performance and control of CSMA wireless networks." Thesis, 2010. http://library.cuhk.edu.hk/record=b6075260.

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Motivated by the fact that the contention graph associated with ICN is a Markov random field (MRF) with respect to the probability distribution of its system states, and that the belief propagation algorithm (BP) is an efficient way to solve "inference" problems in graphical models such as MRF, we study how to apply BP algorithms to the analysis and control of CSMA wireless networks. We investigate three applications: (1) computation of link throughputs given link access intensities; (2) computation of link access intensities required to meet target link throughputs; and (3) optimization of ne

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Lu, Wei, and 盧. 瑋. "Performance Evaluation of CSMA/CA on CC2530." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/q2fthj.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>103<br>Wireless networks are widely popular in modern. The collision occurring is one of the reasons affecting the transmission efficiency. To mitigate the collision issue, the carrier sensing multiple access with collision avoidance (CSMA/CA) protocol is widely applied in wireless networks. IEEE 802.11 DCF protocol and IEEE 802.15.4 CSMA/CA protocol are the most well-known CSMA/CA based protocols. The primary difference between them is how carrier sensing is performed. Stations continuously sense the medium before transmissions in an IEEE 802.11 network, while stat

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ZENG, ZHONG-YONG, and 曾中庸. "Performance analysis of buffered csma relative protocols." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/53081972897279159827.

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Jhuang, Yong-Yi, and 莊詠驛. "Implementation of CSMA/CA Protocol on CC2530." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37595940265865814246.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>101<br>In IEEE 802.15.4 networks, routers cannot enter sleep mode to reduce power consumption and runs out of battery power quickly. In addition, the implementation of CSMA/CA protocol in IEEE 802.15.4 is different from that in IEEE 802.11. Because a node does not perform channel sensing during backoff, a collision may occurs when a node transmit a packet. As a result, IEEE 802.15.4 is unsuitable for wireless sensor networks (WSN). In this thesis, we design and implement the CSMA / CA protocol based on IEEE 802.11 by TI CC2530 for wireless sensor networks. For hardw

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"Markov modulated CSMA protocols with backoff scheduling algorithms." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075338.

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Furthermore, we show that geometric retransmission algorithm is intrinsically unstable for large population sizes. On the other hand, exponential backoff algorithm is more robust and scalable. Even for infinity population sizes, the stable throughput and bounded delay region still exists under certain conditions.<br>In the light of the concern, we propose a queueing model of the general CSMA protocol with probability-based backoff scheduling algorithm. The input buffer of each node is modeled as a Geo/G/1 queue, in which the service time distribution of each individual head-of-line (HOL) packe

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