Relevant bibliographies by topics / Distributed Coordination Function (DCF)

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Distributed Coordination Function (DCF)'

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Published: 4 June 2021
Last updated: 18 June 2025

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Journal articles on the topic "Distributed Coordination Function (DCF)"

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Vignan, B. Suvarna, and B. Lalu Naick. "Enhanced Distributed Coordination Function of MAC for VoIP Services Using IEEE802.11 Networks." Advanced Materials Research 433-440 (January 2012): 2304–9. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.2304.

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Voice over Internet Protocol (VoIP) is an important service with strict Quality-of-Service (QoS) requirements with in wireless local area networks. The popular Distributed Coordination Function (DCF) of IEEE802.11 Medium Access Control (MAC) protocol adopts Multiplicative Increase and linear Decrease procedure to reduce the packet collision probability in WLANs. In DCF, the size of contention window is doubled upon a collision regardless of the network loads. This paper presents an enhanced DCF scheme to improve the QoS of VoIP in WLANs. This scheme applies a threshold of the collision rate to switch between two different functions for increasing the size of contention window based on the status of network loads. The performance of this scheme investigated and compared to the original DCF using the network simulator NS-2. Under the high traffic loads the packet loss probability decreases with the enhanced DCF compared to the original DCF. Some other parameters like throughput and access delay is decreased with the enhanced DCF.
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TAKAHASHI, K. "Performance Improvement for IEEE 802.11 Distributed Coordination Function (DCF)." IEICE Transactions on Communications E89-B, no. 5 (2006): 1605–12. http://dx.doi.org/10.1093/ietcom/e89-b.5.1605.

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Abdel-Ameer, Zaynab Mahir, Abdul Kareem A. Najem Alaloosy, and Khattab M. Ali Alheeti. "Performance analysis and evaluation of IEEE 802.11 distributed coordination function using OPNET." Bulletin of Electrical Engineering and Informatics 9, no. 6 (2020): 2595–600. http://dx.doi.org/10.11591/eei.v9i6.2477.

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This paper discusses the distributed coordination function (DCF) access mechanism which is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme. Simulation projects for different DCF performance parameters have been built using the OPNET network simulator. The projects are mainly basic service set (BSS) topology simulated under different parameter values (data rate, fragmentation, RTS/CTS, number of nodes, and load condition). Simulation results show when the DCF access mechanism is better under what load condition, and how to choose the best fragmentation threshold and other access-mechanism specific parameters according to the network conditions. Simulation results were validated against a theoretically calculated maximum throughput (the simulation maximum throughput was about 70% of the theoretically calculated maximum throughput).
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Zaynab, Mahir Abdel-Ameer, Kareem A. Najem Alaloosy Abdul, and M. Ali Alheeti Khattab. "Performance analysis and evaluation of IEEE 802.11 distributed coordination function using OPNET." Bulletin of Electrical Engineering and Informatics 9, no. 6 (2020): 2595–600. https://doi.org/10.11591/eei.v9i6.2477.

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This paper discusses the distributed coordination function (DCF) access mechanism which is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme. Simulation projects for different DCF performance parameters have been built using the OPNET network simulator. The projects are mainly basic service set (BSS) topology simulated under different parameter values (data rate, fragmentation, RTS/CTS, number of nodes, and load condition). Simulation results show when the DCF access mechanism is better under what load condition, and how to choose the best fragmentation threshold and other access-mechanism specific parameters according to the network conditions. Simulation results were validated against a theoretically calculated maximum throughput (the simulation maximum throughput was about 70% of the theoretically calculated maximum throughput).
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Choi, Woo-Yong. "Enhancing MAC performance of DCF protocol for IEEE 802.11 wireless LANs." Journal of Electrical Engineering 68, no. 1 (2017): 83–86. http://dx.doi.org/10.1515/jee-2017-0012.

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Abstract The DCF (Distributed Coordination Function) is the basic MAC (Medium Access Control) protocol of IEEE 802.11 wireless LANs and compatible with various IEEE 802.11 PHY extensions. The performance of the DCF degrades exponentially as the number of nodes participating in the DCF transmission procedure increases. To deal with this problem, we propose a simple, however efficient modification of the DCF by which the performance of the DCF is greatly enhanced.
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Choi, Woo-Yong. "Hybrid MAC protocol for IEEE 802.11 wireless LANs with hidden node problem." Journal of Electrical Engineering 69, no. 4 (2018): 323–25. http://dx.doi.org/10.2478/jee-2018-0046.

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Abstract Combining the IEEE 802.11 basic MAC (medium access control) protocols, which are the DCF (distributed coordination function) and the PCF (point coordination function), we propose a hybrid MAC protocol to improve the performance of IEEE 802.11 wireless LANs and mitigate the hidden node problem.
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Nandhini., D., and S. Rajeswari. "Performance Analysis of Network Coding with IEEE802.11 DCF Using Multi Path Transfer Protocol in Wireless Network." Journal of Switching Hub 3, no. 3 (2018): 26–29. https://doi.org/10.5281/zenodo.2292894.

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In this paper investigated the throughput and end to end delay of network coding under IEEE802.11 Distributed coordination Function (DCF). In this paper proposed the random medium access of CSMA/CA   as in IEEE802.11 distributed coordination function with Multi Path Transfer Protocol (DCF-MPTP). In a CSMA/CA is based on the combination of physical carrier sensing and exponential back off algorithm and then formulate the probability of successful transmission, collision probability and the re-transmission mechanism. In our model multi hop network used the MPTP (protocol) it prevent the delay and packed loss of source to destination. Finally use computer simulation to verify an analytical   model.
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Choi, Woo-Yong. "Asymptotic performance modelling of DCF protocol with prioritized channel access." Journal of Electrical Engineering 68, no. 6 (2017): 482–86. http://dx.doi.org/10.1515/jee-2017-0084.

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Abstract Recently, the modification of the DCF (Distributed Coordination Function) protocol by the prioritized channel access was proposed to resolve the problem that the DCF performance worsens exponentially as more nodes exist in IEEE 802.11 wireless LANs. In this paper, an asymptotic analytical performance model is presented to analyze the MAC performance of the DCF protocol with the prioritized channel access.
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Fitzgerald, Emma, Ulf Körner, and Bjorn Landfeldt. "An analytic model for Throughput Optimal Distributed Coordination Function (TO-DCF)." Telecommunication Systems 66, no. 2 (2017): 197–215. http://dx.doi.org/10.1007/s11235-017-0275-6.

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Shi, Chun, Xian Hua Dai, Zheng Jie Deng, and Shu Qian He. "A Novel Delay Model for IEEE 802.11." Applied Mechanics and Materials 263-266 (December 2012): 1032–36. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.1032.

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With the popularity of the IEEE 802.11 standards, many analytical delay studies for the Distributed Coordination Function (DCF) have been reported. In this paper, we analyze the additional idle durations that a tagged node needs to wait due to other nodes transmissions. Separating the distributed inter-frame space (DIFS) and extended inter-frame space (EIFS) durations from the full time of a successful transmission, we provide a correct function analysis of the DIFS and EIFS durations and build a more accurate delay model for the IEEE 802.11 DCF. The theoretical analysis and simulation results prove that the proposed delay model is coincident with the real performance when the node number increases.
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Dissertations / Theses on the topic "Distributed Coordination Function (DCF)"

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Greyling, Neville. "An investigation into PCF-DCF behaviour of 802.11b networks." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4118.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: In recent years the demand for bandwidth has dramatically increased because of new applications for data and multimedia, and wireless technology has prevailed as a prominent technology for data connectivity, especially for home, office and last mile services. As wireless communications are dependant upon spectrum availability, which is communal, this scarce commodity in communication has to be used as efficiently as possible. Some aspects of this requirement are addressed in this project. We chose the IEEE 802.11b standard for this particular investigation because of its widespread use, the vast amount of applicable literature, the variety of software simulation tools and the ease with which equipment can be obtained. The IEEE 802.11 standard specified the Point Coordination Function as the de- terministic protocol. Recently research into this aspect has stagnated, and it was the purpose of this project to investigate how existing infrastructure networks could be improved by optimising some modes of the 802.11 protocol. The investigation also hoped to determine when to change between Distributed Coordination Function (DCF) and Point Coordination Function (PCF), and to provide an adaptive protocol to do so. This thesis presents mathematical models for the operation of DCF and PCF modes, which is compared with results from a network simulator (ns2), for theoretical veri- fication. A protocol is also proposed to dynamically switch between DCF and PCF, to harness the advantages they present.<br>AFRIKAANSE OPSOMMING: Die afgelope paar jaar het die aanvraag na bandwydte dramaties verhoog as gevolg van nuwe toepassings vir data en multimedia, en draadlose tegnologie het voorgekom as ’n dominante tegnologie vir data konnektiwiteit, veral vir die huis, kantoor en laaste myl dienste. Omdat draadlose kommunikasie afhanklik is van spektrum beskikbaarheid, wat gemeenskaplik is, moet hierdie skaars kommoditeit in kommunikasie so effektief moontlik gebruik word. Sekere aspekte van die vereiste sal in die tesis ondersoek word. Dit is besluit om die IEEE 802.11b standard vir die spesifieke ondersoek te gebruik as gevolg van die wye toepassing, die groot hoeveelheid beskikbare literatuur, die verskeidenheid simulasie sagteware en die gemak waarmee die toerusting bekom kan word. Die IEEE 802.11 standaard spesifiseer the Punt Koordinasie Funksie (PCF) as die deterministiese protokol vir die betrokke standaard. Onlangs het navorsing oor hierdie aspek gestagneer, en dit is die doel van die projek om te ondersoek hoe bestaande infrastruktuur netwerke moontlik verbeter kan word deur optimering van sekere modusse van die 802.11 protokol. Die ondersoek hoop ook om te bepaal wanneer die oorgang van die Distrubusie Koordinasie Funksie (DCF) en Punt Ko- ordinasie Funksie sal plaasvind, en om ’n dienooreenstemmende protokol te on- twikkel. Die tesis verskaf wiskundige modelle vir die werking van die DCF en PCF modusse, wat vergelyk word met resultate uit ’n netwerk simulator (ns2), vir teoretiese ver- ifikasie. ’n Protokol word ook voorgestel om dinamies te wissel tussen DCF and PCF, om die voordele wat die protokolle verskaf te gebruik.
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Kim, Jinho D. "Centralized random backoff for collision free wireless local area networks." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31055.

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Over the past few decades, wireless local area networks (WLANs) have been widely deployed for data communication in indoor environments such as offices, houses, and airports. In order to fairly and efficiently use the unlicensed frequency band that Wi-Fi devices share, the devices follow a set of channel access rules, which is called a wireless medium access control (MAC) protocol. It is known that wireless devices following the 802.11 standard MAC protocol, i.e. the distributed coordination function (DCF), suffer from packet collisions when multiple nodes simultaneously transmit. This significantly degrades the throughput performance. Recently, several studies have reported access techniques to reduce the number of packet collisions and to achieve a collision free WLAN. Although these studies have shown that the number of collisions can be reduced to zero in a simple way, there have been a couple of remaining issues to solve, such as dynamic parameter adjustment and fairness to legacy DCF nodes in terms of channel access opportunity. Recently, In-Band Full Duplex (IBFD) communication has received much attention, because it has significant potential to improve the communication capacity of a radio band. IBFD means that a node can simultaneously transmit one signal and receive another signal in the same band at the same time. In order to maximize the performance of IBFD communication capability and to fairly share access to the wireless medium among distributed devices in WLANs, a number of IBFD MAC protocols have been proposed. However, little attention has been paid to fairness issues between half duplex nodes (i.e. nodes that can either transmit or receive but not both simultaneously in one time-frequency resource block) and IBFD capable nodes in the presence of the hidden node problem.
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Kovář, Petr. "Multimediální služby v mobilních sítích." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233480.

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Long time ago, there were developed methods which can allow fast exchange of information at the longest distance possible. Until recent time, the possibilities of long way communications were very limited. There were technological and financial limitations mainly. With telegraph, telephone and the newest – computer networks invention, the telecommunication services became cheaper and much more comprehensive. With accession and high scale spread of internet, the role of communications is much more important. The most actual trend is mobile internet and connected multimedia networks and their instant accessibility from anywhere. On the first side there are classical telecommunication networks as GSM, UMTS, on the other side there is very strong alternative in shape of WiMAX and WiFi networks combination. For the usage of multimedia services in that networks is very important to handle their prefferization over other traffic, which is very difficult task even on wireless media. For the finding of new processes and methods, which can allow it, there is, at fist, the need for highly accurate and authentic mathematical models. In this doctoral thesis is mapped actual state of the art and proposed the new mathematical model of Distribution Coordination Function, which is much-frequent used as access method in 802.11 networks, Wi-Fi.
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Zhao, Rui. "Mesh distributed coordination function for efficient wireless Mesh networks supporting QoS /." Aachen : Mainz, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016149899&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Venkataraman, Aravind. "802.11 Fingerprinting to Detect Wireless Stealth Attacks." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/cs_theses/57.

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We propose a simple, passive and deployable approach for fingerprinting traffic on the wired side as a solution for three critical stealth attacks in wireless networks. We focus on extracting traces of the 802.11 medium access control (MAC) protocol from the temporal arrival patterns of incoming traffic streams as seen on the wired side, to identify attacker behavior. Attacks addressed include unauthorized access points, selfish behavior at the MAC layer and MAC layer covert timing channels. We employ the Bayesian binning technique as a means of classifying between delay distributions. The scheme requires no change to the 802.11 nodes or protocol, exhibits minimal computational overhead and offers a single point of discovery. We evaluate our model using experiments and simulations.
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Panda, Manoj Kumar. "Topics In Performance Modeling Of IEEE 802.11 Wireless Local Area Networks." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/1276.

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This thesis is concerned with analytical modeling of Wireless Local Area Networks (WLANs) that are based on IEEE 802.11 Distributed Coordination Function (DCF). Such networks are popularly known as WiFi networks. We have developed accurate analytical models for the following three network scenarios: (S1) A single cell WLAN with homogeneous nodes and Poisson packet arrivals, (S2) A multi-cell WLAN (a) with saturated nodes, or (b) with TCP-controlled long-lived downloads, and (S3) A multi-cell WLAN with TCP-controlled short-lived downloads. Our analytical models are simple Markovian abstractions that capture the detailed network behavior in the considered scenarios. The insights provided by our analytical models led to two applications: (i) a faster “model-based'” simulator, and (ii) a distributed channel assignment algorithm. We also study the stability of the network through our Markov models. For scenario (S1), we develop a new approach as compared to the existing literature. We apply a “State Dependent Attempt Rate'” (SDAR) approximation to reduce a single cell WLAN with non-saturated nodes to a coupled queue system. We provide a sufficient condition under which the joint queue length Markov chain is positive recurrent. For the case when the arrival rates into the queues are equal we propose a technique to reduce the state space of the coupled queue system. In addition, when the buffer size of the queues are finite and equal we propose an iterative method to estimate the stationary distribution of the reduced state process. Our iterative method yields accurate predictions for important performance measures, namely, “throughput'”, “collision probability” and “packet delay”. We replace the detailed implementation of the MAC layer in NS-2 with the SDAR contention model, thus yielding a ``model-based'' simulator at the MAC layer. We demonstrate that the SDAR model of contention provides an accurate model for the detailed CSMA/CA protocol in scenario (S1). In addition, since the SDAR model removes much of the details at the MAC layer we obtain speed-ups of 1.55-5.4 depending on the arrival rates and the number of nodes in the single cell WLAN. For scenario (S2), we consider a restricted network setting where a so-called “Pairwise Binary Dependence” (PBD) condition holds. We develop a first-cut scalable “cell-level” model by applying the PBD condition. Unlike a node- or link-level model, the complexity of our cell-level model increases with the number of cells rather than with the number of nodes/links. We demonstrate the accuracy of our cell-level model via NS-2 simulations. We show that, as the “access intensity” of every cell goes to infinity the aggregate network throughput is maximized. This remarkable property of CSMA, namely, “maximization of aggregate network throughput in a distributed manner” has been proved recently by Durvy et al. (TIT, March, 2009) for an infinite linear chain of nodes. We prove it for multi-cell WLANs with arbitrary cell topology (under the PBD condition). Based on this insight provided by our analytical model we propose a distributed channel assignment algorithm. For scenario (S3), we consider the same restricted network setting as for scenario (S2). For Poisson flow arrivals and i.i.d. exponentially distributed flow sizes we model a multi-cell WLAN as a network of processor-sharing queues with state-dependent service rates. The state-dependent service rates are obtained by applying the model for scenario (S2) and taking the access intensities to infinity. We demonstrate the accuracy of our model via NS-2 simulations. We also demonstrate the inaccuracy of the service model proposed in the recent work by Bonald et al. (SIGMETRICS 2008) and identify the implicit assumption in their model which leads to this inaccuracy. We call our service model which accurately characterizes the service process in a multi-cell WLAN (under the PBD condition) “DCF scheduling” and study the “stability region” of DCF scheduling for small networks with single or multiple overlapping “contention domains”.
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Panda, Manoj Kumar. "Topics In Performance Modeling Of IEEE 802.11 Wireless Local Area Networks." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1276.

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This thesis is concerned with analytical modeling of Wireless Local Area Networks (WLANs) that are based on IEEE 802.11 Distributed Coordination Function (DCF). Such networks are popularly known as WiFi networks. We have developed accurate analytical models for the following three network scenarios: (S1) A single cell WLAN with homogeneous nodes and Poisson packet arrivals, (S2) A multi-cell WLAN (a) with saturated nodes, or (b) with TCP-controlled long-lived downloads, and (S3) A multi-cell WLAN with TCP-controlled short-lived downloads. Our analytical models are simple Markovian abstractions that capture the detailed network behavior in the considered scenarios. The insights provided by our analytical models led to two applications: (i) a faster “model-based'” simulator, and (ii) a distributed channel assignment algorithm. We also study the stability of the network through our Markov models. For scenario (S1), we develop a new approach as compared to the existing literature. We apply a “State Dependent Attempt Rate'” (SDAR) approximation to reduce a single cell WLAN with non-saturated nodes to a coupled queue system. We provide a sufficient condition under which the joint queue length Markov chain is positive recurrent. For the case when the arrival rates into the queues are equal we propose a technique to reduce the state space of the coupled queue system. In addition, when the buffer size of the queues are finite and equal we propose an iterative method to estimate the stationary distribution of the reduced state process. Our iterative method yields accurate predictions for important performance measures, namely, “throughput'”, “collision probability” and “packet delay”. We replace the detailed implementation of the MAC layer in NS-2 with the SDAR contention model, thus yielding a ``model-based'' simulator at the MAC layer. We demonstrate that the SDAR model of contention provides an accurate model for the detailed CSMA/CA protocol in scenario (S1). In addition, since the SDAR model removes much of the details at the MAC layer we obtain speed-ups of 1.55-5.4 depending on the arrival rates and the number of nodes in the single cell WLAN. For scenario (S2), we consider a restricted network setting where a so-called “Pairwise Binary Dependence” (PBD) condition holds. We develop a first-cut scalable “cell-level” model by applying the PBD condition. Unlike a node- or link-level model, the complexity of our cell-level model increases with the number of cells rather than with the number of nodes/links. We demonstrate the accuracy of our cell-level model via NS-2 simulations. We show that, as the “access intensity” of every cell goes to infinity the aggregate network throughput is maximized. This remarkable property of CSMA, namely, “maximization of aggregate network throughput in a distributed manner” has been proved recently by Durvy et al. (TIT, March, 2009) for an infinite linear chain of nodes. We prove it for multi-cell WLANs with arbitrary cell topology (under the PBD condition). Based on this insight provided by our analytical model we propose a distributed channel assignment algorithm. For scenario (S3), we consider the same restricted network setting as for scenario (S2). For Poisson flow arrivals and i.i.d. exponentially distributed flow sizes we model a multi-cell WLAN as a network of processor-sharing queues with state-dependent service rates. The state-dependent service rates are obtained by applying the model for scenario (S2) and taking the access intensities to infinity. We demonstrate the accuracy of our model via NS-2 simulations. We also demonstrate the inaccuracy of the service model proposed in the recent work by Bonald et al. (SIGMETRICS 2008) and identify the implicit assumption in their model which leads to this inaccuracy. We call our service model which accurately characterizes the service process in a multi-cell WLAN (under the PBD condition) “DCF scheduling” and study the “stability region” of DCF scheduling for small networks with single or multiple overlapping “contention domains”.
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Wu, Xue Zheng, and 吳學正. "Performance Analysis for IEEE 802.11e Enhanced Distributed Coordination Function." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/57484185379705394726.

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碩士<br>國立暨南國際大學<br>通訊工程研究所<br>93<br>In IEEE 802.11 each station can work well by using Distributed Coordination Function(DCF) mechanism in Medium Access Control(MAC)layer, but the DCF can not support quality-of-service (QoS) . Therefore , the 802.11 working group proposes the enhanced DCF (EDCF) mechanism to divide data by different priorities before transmission. In this way we can achieve the expected QoS when the network operates. We study the distributed coordination function and the enhanced DCF(EDCF) of IEEE 802.11 in this thesis. By comparing the DCF and EDCF mechanisms and with the simulation results, we found that even the traffic load is high, the EDCF can transmit real-time frame more quickly than the DCF. We also found from simulation results that contention window (CW) will significantly affect the network performance.
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施金山. "Adaptive Enhanced Distributed Coordination Function in 802.11 Wireless LAN." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/29431445997595462551.

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碩士<br>國立中興大學<br>電機工程學系<br>91<br>Abstract The IEEE 802.11 Wireless Local Network (WLAN) specification defines two ways to configure a wireless network: ad-hoc mode and infrastructure mode. Ad-hoc networks do not use an access coordinator to connect wireless stations to a Distribution System (DS) but infrastructure networks do. Wireless stations in IEEE 802.11 WLAN should use IEEE 802.11 Medium Access Control (MAC) protocol to access wireless medium to transfer data. IEEE 802.11 MAC protocol incorporates two access methods: Distributed Coordination Function (DCF) and Point Coordination Function (PCF). DCF is based on the Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) protocol. In this mode, a station must sense the medium before sending a packet. If the medium is found idle for a specific time then it can transmit a packet. PCF uses a Point Coordinator (PC) to determine which STA currently has the right to transmit. The operation is essentially that of polling, with the PC performing the role of the polling master. DCF can not provide any Quality of Service (QoS), so there are many medium access schemes proposed for IEEE 802.11 WLAN to provide QoS. The IEEE 802.11 is currently working on the support of QoS in a new standard, called IEEE 802.11e. A new access method called Hybrid Coordination Function (HCF) is introduced. It is a queue-based differentiation that uses both DCF and PCF enhancements. One of the main problems of Enhanced DCF is the static reset of the Contention Window (CW) which decreases the throughput performance and increases the collision rate especially at high load conditions. We use a mechanism named Adaptive Enhanced Distributed Coordination Function (AEDCF) that stations can dynamically adjust their CW depending on traffic load, so the collision rate will increase more slowly. We use Network Simulator Version 2 (NS2) to simulate AEDCF and EDCF, and results show that AEDCF outperforms the basic EDCF especially at high load conditions.
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Po-Yen, Chih. "An Enhanced Backoff Mechanism in IEEE 802.11 Distributed Coordination Function." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-0107200515520400.

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Book chapters on the topic "Distributed Coordination Function (DCF)"

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Sedrati, Maamar, Azeddine Bilami, Ramdane Maamri, and Mohamed Benmohammed. "Contention Window Optimization for Distributed Coordination Function (DCF) to Improve Quality of Service at MAC Layer." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21984-9_58.

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Stavrou, Photios A., Christos K. Kourtellaris, and Charalambos D. Charalambous. "Information Nonanticipative Rate Distortion Function and Its Applications." In Coordination Control of Distributed Systems. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10407-2_37.

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Al-Mefleh, Haithem, and J. Morris Chang. "High Performance Distributed Coordination Function for Wireless LANs." In NETWORKING 2008 Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-79549-0_71.

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Takeda, Hiroki, Yasuhisa Hirata, Zhi-Dong Wang, and Kazuhiro Kosuge. "Collision Avoidance Algorithm for Two Tracked Mobile Robots Transporting a Single Object in Coordination Based on Function Allocation Concept." In Distributed Autonomous Robotic Systems 5. Springer Japan, 2002. http://dx.doi.org/10.1007/978-4-431-65941-9_16.

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Li, Bo, and Roberto Battiti. "Performance Analysis of an Enhanced IEEE 802.11 Distributed Coordination Function Supporting Service Differentiation." In Quality for All. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45188-4_16.

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Li, Wenpeng, and Xu Li. "An Improved Contention-Based MAC Protocol Based on IEEE 802.11 Distributed Coordination Function." In Lecture Notes in Operations Research. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2625-1_19.

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Chen, Yeong-Sheng, Fan-Chun Tseng, and Chih-Heng Ke. "Achieving Weighted Fairness for High Performance Distributed Coordination Function with QoS Support in WLANs." In Advances in Intelligent Systems and Applications - Volume 1. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35452-6_63.

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Chetan, Kumar S., P. Venkataram, and Ranapratap Sircar. "Distributed Approach for QoS Guarantee to Wireless Multimedia." In Multimedia Technologies. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-953-3.ch102.

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Providing support for QoS at the MAC layer in the IEEE 802.11 is one of the very active research areas. There are various methods that are being worked out to achieve QoS at MAC level. In this article we describe a proposed enhancement to the DCF (distributed coordination function) access method to provide QoS guarantee for wireless multimedia applications.
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Chetan, K., P. Venkataram, and R. Sircar. "Distributed Approach for QoS Guarantee to Wireless Multimedia." In Encyclopedia of Mobile Computing and Commerce. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59904-002-8.ch034.

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Providing support for QoS at the MAC layer in the IEEE 802.11 is one of the very active research areas. There are various methods that are being worked out to achieve QoS at MAC level. In this article we describe a proposed enhancement to the DCF (distributed coordination function) access method to provide QoS guarantee for wireless multimedia applications.
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"Interconnection Issues in CPS." In Challenges, Opportunities, and Dimensions of Cyber-Physical Systems. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7312-0.ch004.

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This chapter shows the interconnection issues in different wireless networks such as ad hoc networks and sensor networks. It also specifies the need for multicast routing protocols in mobile networks, because these wireless networks are suitable for multicast communication due to its inherent transmission ability. Based on the area to be covered, mechanism used for sensor deployment, and various properties of sensor network properties, different coverage formulations have been suggested. In addition, several constructions reachable areas and their expectations along with an outline of the explanations are described. Though 802.11 planned for organization-based systems, the Distributed Coordination Function (DCF) offered in 802.11 permits mobile networks to communicate with the channel exclusive of the base location. Several performance issues related to IEEE 802.11 are revealed. This chapter identifies the main reasons for performance losses and provides solutions for the scenarios that are specific to certain issues related to CPS.
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Conference papers on the topic "Distributed Coordination Function (DCF)"

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Lei Zhong, Yozo Shoji, Kiyohide Nakauchi, and Suyong Eum. "BE-DCF: Barring-Enhanced Distributed Coordination Function for Machine Type Communications in IEEE 802.11 networks." In 2014 ICC - 2014 IEEE International Conference on Communication Workshop (ICC). IEEE, 2014. http://dx.doi.org/10.1109/iccw.2014.6881242.

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Hassan, W. H. W., M. Faulkner, and H. King. "Integration of a modified distributed coordination function (DCF) in wireless LAN using IEEE 802.11 n to mitigate interference and optimise transmission capacity in full duplex gigabits passive optical network (GPON)." In 2011 8th International Conference on Information, Communications & Signal Processing (ICICS 2011). IEEE, 2011. http://dx.doi.org/10.1109/icics.2011.6174251.

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Yukhymchuk, Mariia S. "Decentralized coordination control of distributed cyber-physical systems with continuous objects." In 16th IC Measurement and Control in Complex Systems. VNTU, 2022. http://dx.doi.org/10.31649/mccs2022.14.

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A distributed system is one that consists of separate elements located at different points in space, the functions and resources of the system are divided between the elements, and the location in space affects the functioning of the system as a whole. A special case of distributed systems is distributed control systems (DCS). In today's market, there are a large number of distributed control systems created at different times and by different companies. In the work, a method of decentralized coordination of control of distributed cyber-physical systems with continuous objects is developed, a RKFS model with a continuous production object and resource state management is developed, which is characterized by taking into account the mutual influence of controlled elements of a continuous production object and resource costs for production and is presented in in the form of a two-flow graph, an indicator of the level of coordination is proposed, which determines the state of coordination in the interval from chaos to a given deterministic state, which allows to evaluate the effectiveness of the coordination system, the criterion of coordination of the RKFS with continuous production facilities, which is based on the model of a continuous production facility, and distribution of states of object elements in space and time, the method of forecasting the state of distributed cyber-physical systems with continuous objects, which is based on the RKFS model with a continuous production object and resource management of state and space-time spectrum, has been improved states and disturbances.
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Xutao Yu and Zaichen Zhang. "Analysis model of distributed coordination function." In 2007 International Symposium on Intelligent Signal Processing and Communication Systems. IEEE, 2007. http://dx.doi.org/10.1109/ispacs.2007.4446009.

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Alsaif, K. I., and E. A. Altaii. "WLAN throughput enhancement through distributed coordinate function DCF for 802.11 WLAN." In 2013 International Conference on Computer Applications Technology (ICCAT 2013). IEEE, 2013. http://dx.doi.org/10.1109/iccat.2013.6522063.

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Indumathi, G., and K. Murugesan. "Distributed fair scheduling with distributed coordination function in WLAN." In 2008 16th IEEE International Conference on Networks. IEEE, 2008. http://dx.doi.org/10.1109/icon.2008.4772617.

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Ye, Xiaohui, Xin Liu, S. J. Ben Yoo, and Zhi Ding. "Priority Collision Resolution - Distributed Coordination Function for Distributed Wireless Networks." In IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference. IEEE, 2007. http://dx.doi.org/10.1109/glocom.2007.893.

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Shioda, Shigeo, and Daiki Tsubotani. "Bistable Behavior of IEEE 802.11 Distributed Coordination Function." In 2019 22nd International Symposium on Wireless Personal Multimedia Communications (WPMC). IEEE, 2019. http://dx.doi.org/10.1109/wpmc48795.2019.9096213.

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Ahmad, Rizwan, Fu-Chun Zheng, and Micheal Drieberg. "Delay Analysis of Enhanced Relay-Enabled Distributed Coordination Function." In 2010 IEEE 71st Vehicular Technology Conference. IEEE, 2010. http://dx.doi.org/10.1109/vetecs.2010.5494181.

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Ahmad, Rizwan, Fu-Chun Zheng, M. Drieberg, and Sverrir Olafsson. "Performance evaluation of Enhanced relay-enabled Distributed Coordination Function." In 2008 European Wireless Conference (EW). IEEE, 2008. http://dx.doi.org/10.1109/ew.2008.4623903.

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