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

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

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

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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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3

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 ot

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4

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 ot

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5

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 th

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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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9

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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10

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

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11

Lee, Yutae, Min Young Chung, and Tae-Jin Lee. "Performance Analysis of IEEE 802.11 DCF under Nonsaturation Condition." Mathematical Problems in Engineering 2008 (2008): 1–17. http://dx.doi.org/10.1155/2008/574197.

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Carrier sense multiple access with collision avoidance (CSMA/CA) methods are considered to be attractive MAC protocols for wireless LANs. IEEE 802.11 distributed coordination function (DCF) is a random channel access scheme based on CSMA/CA method and the binary slotted exponential backoff procedure to reduce the packet collision. In this paper, we propose a new analytical model for a nonsaturated IEEE 802.11 DCF network and evaluate its performance. We verify our model using simulations and show that our results agree with the simulations.

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12

Tadayon, Navid, Saadan Zokaei, and Elaheh Askari. "A Novel Prioritization Scheme to Improve QoS in IEEE 802.11e Networks." Journal of Computer Systems, Networks, and Communications 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/856724.

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IEEE 802.11 WLAN utilizes a distributed function at its MAC layer, namely, DCF to access the wireless medium. Due to its distributed nature, DCF is able to guarantee working stability in a wireless medium while maintaining the assembling and maintenance cost in a low level. However, DCF is inefficient in dealing with real-time traffics due to its incapability on providing QoS. IEEE 802.11e was introduced as a supplementary standard to cope with this problem. This standard introduces an Enhanced Distributed Coordination Function (EDCF) that works based on diff-Serve model and can serve multiple

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Gao, Sheng Guo. "A Markov Model for the IEEE 802.11 DCF under Limit Load." Applied Mechanics and Materials 48-49 (February 2011): 29–33. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.29.

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Wireless Local Area Networks (WLANs) have been attracted significant research during the last few years. The primary medium access control (MAC) technique of 802.11 is called distributed coordination function (DCF). DCF is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme with binary slotted exponential backoff. This paper proposes a new Markov model to analyze the CSMA/CA protocol and average packet delay. This model covers the finite load condition and saturation condition. The close agreement between the theoretical results and simulation results using NS-2 under rea

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Zhang, HuiYao, Marek E. Bialkowski, Garry A. Einicke, and John Homer. "An Extended AODV Protocol for VoIP Application in Mobile Ad Hoc Network." ECTI Transactions on Electrical Engineering, Electronics, and Communications 7, no. 2 (2007): 25–32. http://dx.doi.org/10.37936/ecti-eec.200972.171872.

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In this paper, the problem of voice calls over a mobile ad hoc network that employs IEEE 802.11b standard for the lowest communication layer is considered. The Distributed Coordination Function (DCF) is assumed as the basic medium access protocol. Two DCF access mechanisms for VoIP conversation are considered. A new metric for searching a stable routing based on an extended Ad-hoc On-Demand Distance Vector (AODV) protocol is proposed and investigated. The simulation results show that the new routing protocol can improve performance of VoIPover ad hoc network as compared to the standard AODV pr

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Ranganathan, Radha, and Kathiravan Kannan. "Enhancing the Selection of Backoff Interval Using Fuzzy Logic over Wireless Ad Hoc Networks." Scientific World Journal 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/680681.

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IEEE 802.11 is the de facto standard for medium access over wireless ad hoc network. The collision avoidance mechanism (i.e., random binary exponential backoff—BEB) of IEEE 802.11 DCF (distributed coordination function) is inefficient and unfair especially under heavy load. In the literature, many algorithms have been proposed to tune the contention window (CW) size. However, these algorithms make every node select its backoff interval between [0, CW] in a random and uniform manner. This randomness is incorporated to avoid collisions among the nodes. But this random backoff interval can change

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16

Phaneendra, Kumar Chebrolu, and Kiran Kumar Bandi. "Improvement of Network Utility and Energy Efficiency in DSME based Internet of Things Networks." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 3168–62. https://doi.org/10.35940/ijeat.C5187.029320.

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This paper provides a comparison between IEEE 802.11 and IEEE 802.15.4e standards in the context of Internet of Things (IoT). These emerging standards are the amendments of IEEE 802.11 and IEEE 802.15.4 to support IoT based applications. The 802.11 has a channel access scheme, Distributed coordination function (DCF). On the other hand, IEEE 802.15.4e introduces five MAC behavior mode. Among these five modes, DSME is well suited for IoT. A comparison between these two standards is discussed in this paper by using an analytical model and are validated through ns-3 simulations. Results show that

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17

Nandhini.D and Rajeswari S. "Performance Analysis of Network Coding with Exponential back off Algorithm Using Multi Path Transfer Protocol in Wireless Network." Journal of Analog and Digital Communications 4, no. 2 (2019): 20–26. https://doi.org/10.5281/zenodo.3334957.

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Network coding is an effective technique to boost the capacity of wireless networks. In that network, transmitted data is encoded and decoded to increase network throughput and to reduce end to end delay and make the network more robust. In this paper, the throughput and end to end delay of network coding is investigated under IEEE802.11 DCF. It is proposed that this can be achieved with CSMA/CA as in IEEE802.11 distributed coordination function with Multi Path Transfer Protocol (DCF-MPTP). CSMA/CA is based on the combination of physical carrier sensing and exponential back off algorithm. Prop

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18

Sarkar, Nurul I. "Improving WLAN Performance by Modifying an IEEE 802.11 Protocol." International Journal of Wireless Networks and Broadband Technologies 1, no. 1 (2011): 15–31. http://dx.doi.org/10.4018/ijwnbt.2011010102.

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One of the limitations of the IEEE 802.11 distributed coordination function (DCF) protocol is its low bandwidth utilization under medium-to-high traffic loads resulting in low throughput and high packet delay. To overcome performance problems, traditional IEEE 802.11 DCF (“DCF”) protocol is modified to the buffer unit multiple access (BUMA) protocol. The BUMA protocol achieves a better system performance by introducing a temporary buffer unit at the medium access control (MAC) layer to accumulate multiple packets and combine them into a single packet (with a header and a trailer) before transm

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Adekar, R. H., and A. K. Kureshi. "Performance Analysis of Heterogeneous Systems Ieee 802.11 and Ieee 802.16 Using Spectrum Sharing Mechanism." Advanced Engineering Forum 44 (January 17, 2022): 127–35. http://dx.doi.org/10.4028/www.scientific.net/aef.44.127.

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After the advent of cellular standards for mobile wireless voice telephony and data transfer, IEEE 802.11 and IEEE 802.16 standards evolved for wireless broadband data transfer. The IEEE 802.11 replaced the wired LAN and IEEE 802.16 was to wireless point-to-point provide broadband data transfer. IEEE 802.11 operates in 2.4 GHz and 5 GHz bands whereas IEEE 802.11, which was initially designed to operate on a licensed band, later switched to a 2-11 GHz band. However, both these standards used a 5 GHz unlicensed band for transmission causing the possible overlap of channels. The designed protocol

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Chen, Xuan, Yu Bin Xu, and Lin Ma. "A Queuing Model for IEEE 802.11 DCF Performance Analysis." Applied Mechanics and Materials 380-384 (August 2013): 1202–9. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.1202.

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A queuing model is proposed to analyze the performance of IEEE 802.11 Distributed Coordination Function (DCF). By regarding the network performance in the unsaturated case as the expected mean of the network performance in the different saturated cases, the proposed model extends the application scenarios from the saturated case to the nonsaturated case. The queuing model can be used to analyze the network performance and QoS parameters of the stations for different traffic conditions. In addition, this model also applies to the cases in shadow channels. Compared to the existing work based on

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Ahmed, Mumtaz, M. N. Doja, and Mohd Amjad. "An energy efficient IS-MAC based on distributed coordination function (DCF) for wireless passive sensor networks." Journal of Information and Optimization Sciences 41, no. 2 (2020): 555–66. http://dx.doi.org/10.1080/02522667.2020.1733185.

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Baidari, Ishwar, S. P. Sajjan, and Ajeet Singh. "Improving WLAN Quality of Services (Qos) Using Opnet." Oriental journal of computer science and technology 9, no. 3 (2016): 204–11. http://dx.doi.org/10.13005/ojcst/09.03.06.

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Wireless local area networks (WLANs) are in a period of great expansion and there is a strong need for them to support multimedia applications. With the increasing demand and penetration of wireless services, users of wireless networks now expect Quality of Service (QoS) and performance comparable to what is available from fixed networks. Providing QoS requirements like good throughput and minimum access delay are challenging tasks with regard to 802.11 WLAN protocols and Medium Access Control (MAC) functions. This research is done to study, the presently implemented schemes (the Point Coordin

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Rauschert, Peter, Arasch Honarbacht, and Anton Kummert. "Extensions to the IEEE 802.11 TSF for Efficient and Reliable Network Synchronization in Large Scale MANETs." African Journal of Information & Communication Technology 2, no. 2 (2006): 110. http://dx.doi.org/10.5130/ajict.v2i2.233.

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Designing new protocols for Mobile Ad hoc Networks (MANETs) is a great challenge due to their distributed and self organized nature. Though, aspects of approved algorithms for hierarchical topographies may be carried over to these flat networks. The IEEE 802.11 protocol supports ad hoc networks in small scale applications, but its performance in large scale environments is still under investigation. Besides the Distributed Coordination Function (DCF), the Timer Synchronization Function (TSF) can be significantly improved in order to increase the performance in large scale multihop networks. Th

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Adnan, Muhammad, and Eun-Chan Park. "Hybrid Control of Contention Window and Frame Aggregation for Performance Enhancement in Multirate WLANs." Mobile Information Systems 2015 (2015): 1–16. http://dx.doi.org/10.1155/2015/383081.

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The IEEE 802.11 standard has been evolved to support multiple transmission rates in wireless local area networks (WLANs) to cope with diverse channel conditions and to increase throughput. However, when stations with different transmission rates coexist, the basic channel access mechanism of WLAN, distributed coordination function (DCF), not only fails to assure airtime fairness among competing stations but also decreases overall network throughput, because DCF was designed to provide fair opportunity of channel access, regardless of transmission rate. As an effective solution to this problem,

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Lin, Cheng-Han, Ming-Hua Cheng, Wen-Shyang Hwang, Ce-Kuen Shieh, and Yu-Hang Wei. "A Rapidly Adaptive Collision Backoff Algorithm for Improving the Throughput in WLANs." Electronics 12, no. 15 (2023): 3324. http://dx.doi.org/10.3390/electronics12153324.

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In the 802.11 protocol, the fundamental medium access mechanism is called Distributed Coordination Function (DCF). In DCF, before making any transmission attempt, the nodes count down a timer with a value randomly selected from the Contention Window (CW) size. If the transmitted packet is involved in a collision, the node increases the CW size in an attempt to reduce the collision rate. Conversely, if the packet is transmitted successfully, the node reduces the CW size in order to increase the frequency of the transmission attempts. The growth or reduction in the CW size has a critical effect

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Alnazir, Abbas, Rania A. Mokhtar, Hesham Alhumyani, Elmustafa Sayed Ali, Rashid A. Saeed, and S. Abdel-khalek. "Quality of Services Based on Intelligent IoT WLAN MAC Protocol Dynamic Real-Time Applications in Smart Cities." Computational Intelligence and Neuroscience 2021 (October 31, 2021): 1–20. http://dx.doi.org/10.1155/2021/2287531.

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The future directions and challenges for 6G-enabled wireless communication for IoT applications are mainly focused on quality of service (QoS). The selection criteria of mobility management (MM) protocol are mainly the total duration of the delay and packet loss rate during the MM procedure. This is called intelligent handover (IH) to designate a relay with a minimum delay. To solve the problem of handover, media access control (MAC) protocols are used to provide an intelligent protocol for QoS in real-time application in mobility. Moreover, changing the parameter to find the best protocol for

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Singh, Bhupendra, and Rajesh Mishra. "Performance Analysis of DCF- Two Way Handshake vs RTS/CTS During Train-Trackside Communication in CBTC based on WLAN802.11b." Recent Advances in Computer Science and Communications 13, no. 3 (2020): 345–52. http://dx.doi.org/10.2174/2213275912666190103141939.

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Background: Wireless Local Area Network (WLAN) is used primarily in CBTC because of easy availability of commercial WLAN equipment. In present scenario, WLAN Medium Access Control (MAC) protocol is a well-known protocol which is used to satisfy real-time traffic and delay- sensitive applications. The bidirectional train-trackside communication is the fundamental key of train control in CBTC. Methods: DCF describes two basic techniques used for packet transmission: First technique is a Two Way Handshake (TWH) mechanism and another is Four Way Handshake (FWH) mechanisms. RTS/CTS FWH protocol spe

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Khuder, Enaam F. "Performance Analysis of Industrial WLAN Based on EDCA Scheme Defined in IEEE802.11e." Tikrit Journal of Engineering Sciences 21, no. 1 (2013): 24–34. http://dx.doi.org/10.25130/tjes.21.1.04.

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In the last few years wireless local area network (WLAN) technology and products have grownunusually. This growth has encouraged many researchers to employ WLAN technology in differentapplication Areas. Recently, using IEEE 802.11 WLAN in industrial automation applications is attractiveand more interesting. However, the currently used medium access mechanism makes WLANs nondeterministicand hence not suitable for industrial real-time traffic. Legacy IEEE 802.11 WLANs wereinitially designed for best effort traffic only and did not provide any QoS support for this kind of traffic.The new amendmen

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Mosleh, Mahmood. "Traffic Offloading in LTE System Based Heterogeneous Networks." Iraqi Journal for Electrical and Electronic Engineering 13, no. 2 (2017): 152–60. http://dx.doi.org/10.37917/ijeee.13.2.1.

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The continuous growing developments in the traffic of mobile data limits the data throughput and capacity of cellular networks. “Heterogeneous Networks (HetNets)” are efficient solution to realize such demands. However, in HetNets, the congestion on the overloaded cellular network can be increased when the traffic of data is pushed from a cellular network to the Wi-Fi. In practice, offloading the cellular data traffic to a Wireless Local Area Network (WLAN) depending on the signal quality is a broadly deployed method to solve such problem. The use of Device to Device (D2D) communication furthe

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Prince, Kumar, and Raj Rashmi. "Design and Evaluation of MAC Protocol Strategies Techniques in Wireless Ad Hoc Network." International Journal of Trend in Scientific Research and Development 2, no. 6 (2018): 434–39. https://doi.org/10.31142/ijtsrd18446.

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Wireless communication has become a core part of modern communication technology. The Infrastructure less wireless network, commonly referred to as Ad Hoc networks, has attracted extensive research interest for past 30 years. In this work, the focus is on IEEE 802.11 network performance analysis of Multihop hop Ad Hoc networks under non saturated network conditions. To meet the increasing demand of multimedia, it is necessary to provide the quality of service in such networks. The current work presents the development of an analytical model for network performance analysis. The medium access m

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Singh, Rishipal, and D. K. Lobiyal. "Throughput Analysis of IEEE 802.11 DCF with Modified Binary Exponential Backoff in Mobile Ad Hoc Networks." International Journal of Mobile Computing and Multimedia Communications 2, no. 3 (2010): 61–70. http://dx.doi.org/10.4018/jmcmc.2010070105.

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In the design of wireless networks, the medium access protocols have a very large impact on the performance of the network. The IEEE 802.11 is widely accepted technology for the Wireless LANs and is used by wireless networks. This paper presents an analysis of the performance of Distributed Coordination Function (DCF) for IEEE 802.11 under modified Binary Exponential Backoff (BEB) Algorithm using Frequency Hoping Spread Spectrum (FHSS). In the modified algorithm, the size of Contention Window (CW) has been changed with the factor of for the first four collisions and the size becomes double the

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Song, Taewon, and Taeyoon Kim. "Performance Analysis of Synchronous Multi-Radio Multi-Link MAC Protocols in IEEE 802.11be Extremely High Throughput WLANs." Applied Sciences 11, no. 1 (2020): 317. http://dx.doi.org/10.3390/app11010317.

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The representative media access control (MAC) mechanism of IEEE 802.11 is a distributed coordination function (DCF), which operates based on carrier-sense multiple access with collision avoidance (CSMA/CA) with binary exponential backoff. The next amendment of IEEE 802.11 being developed for future Wi-Fi by the task group-be is called IEEE 802.11be, where the multi-link operation is mainly discussed when it comes to MAC layer operation. The multi-link operation discussed in IEEE 802.11be allows multi-link devices to establish multiple links and operate them simultaneously. Since the medium acc

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JEONG, SEOKYUN, SUN HUR, and JUNG-YONG KIM. "PARAMETER DECISION FOR ENHANCING PERFORMANCE OF WIRELESS LANs WITH PRIORITIZED MESSAGES." International Journal of Information Technology & Decision Making 06, no. 02 (2007): 301–13. http://dx.doi.org/10.1142/s0219622007002514.

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Distributed coordination function (DCF) is a primary random access mechanism of IEEE 802.11, which is the basic protocol of wireless LAN based on the CSMA/CA protocol. It enables fast installation with minimal management and maintenance costs and is a very robust protocol for the best effort service in wireless medium. The current DCF, however, is known to be unsuitable for real-time applications such as voice message transmission. In this paper, we focus on the performance issues of IEEE 802.11 which accommodates the prioritized messages. Existing results use the initial window size and backo

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Lee, Ha Cheol. "A MAC Throughput in the IEEE 802.11ac over Error-Prone Channel." Applied Mechanics and Materials 631-632 (September 2014): 801–5. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.801.

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This paper analyzes a MAC (Medium Access Control) layer throughput over error-prone channel in the IEEE 802.11ac-based wireless LAN with DCF (Distributed Coordination Function) protocol and A-MPDU (MAC Protocol Data Unit Aggregation) scheme, using theoretical analysis method. The MAC saturation throughput is evaluated by using a PER (Packet Error Rate) on the condition that the number of station, transmission probability, the number of parallel beams and the number of frames in each A-MPDU are variables. When the PER is 10-2 and the number of aggregated MPDUs in each A-MPDU is 20, it is identi

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Laddomada, Massimiliano, and Fabio Mesiti. "On the Optimization of the IEEE 802.11 DCF: A Cross-Layer Perspective." International Journal of Digital Multimedia Broadcasting 2010 (2010): 1–13. http://dx.doi.org/10.1155/2010/397824.

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This paper is focused on the problem of optimizing the aggregate throughput of the distributed coordination function (DCF) employing the basic access mechanism at the data link layer of IEEE 802.11 protocols. We consider general operating conditions accounting for both nonsaturated and saturated traffic in the presence of transmission channel errors, as exemplified by the packet error rate . The main clue of this work stems from the relation that links the aggregate throughput of the network to the packet rate of the contending stations. In particular, we show that the aggregate throughput pre

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Wu, Qiong, Shuzhen Nie, Pingyi Fan, Hanxu Liu, Fan Qiang, and Zhengquan Li. "A Swarming Approach to Optimize the One-Hop Delay in Smart Driving Inter-Platoon Communications." Sensors 18, no. 10 (2018): 3307. http://dx.doi.org/10.3390/s18103307.

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Multi-platooning is an important management strategy for autonomous driving technology. The backbone vehicles in a multi-platoon adopt the IEEE 802.11 distributed coordination function (DCF) mechanism to transmit vehicles’ kinematics information through inter-platoon communications, and then forward the information to the member vehicles through intra-platoon communications. In this case, each vehicle in a multi-platoon can acquire the kinematics information of other vehicles. The parameters of DCF, the hidden terminal problem and the number of neighbors may incur a long and unbalanced one-hop

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Safdari, Fash, and Anatoliy Gorbenko. "Theoretical and experimental study of performance anomaly in multi-rate IEEE802.11ac wireless networks." Radioelectronic and Computer Systems, no. 4 (November 29, 2022): 85–97. http://dx.doi.org/10.32620/reks.2022.4.06.

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IEEE 802.11 wireless local area networks (WLANs) are shared networks, which use contention-based distributed coordination function (DCF) to share access to wireless medium among numerous wireless stations. The performance of the distributed coordination function mechanism mostly depends on the network load, number of wireless nodes and their data rates. The throughput unfairness, also known as performance anomaly is inherent in the very nature of mixed data rate Wi-Fi networks using the distributed coordination function. This unfairness exhibits itself through the fact that slow clients consum

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Lei, Jianjun, Jianhua Jiang, and Fengjun Shang. "Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs." Wireless Communications and Mobile Computing 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/6931765.

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In Wireless Local Area Networks (WLANs), cochannel deployment can bound channel access delay and improve network capacity due to mitigating the collision and interference among different Access Points (APs). In this paper, we present a network model and an interference model for multiple APs cochannel deployment and propose a channel assignment mechanism which formulates the channel assignment problem into a time slot allocation problem. Meanwhile, we assign the channel based on the vertex coloring algorithm and make extra polls by utilizing the time slot reservation strategy to improve the ch

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Yi, Tian. "OPNET Network Simulations Based on the Performance of WLAN IEEE802.11." Applied Mechanics and Materials 385-386 (August 2013): 1651–54. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1651.

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This paper mainly focus on the modeling and simulating of WLAN (the wireless local area network) IEEE802.11. Based on the current research of IEEE 802.11 protocol and the most powerful network simulation tool OPNET, the paper introduces various behavior of WLAN and standards for WLAN. Research on CSMA / CA(Carrier Sense Multiple Access / Collision Avoidance) and a simulation study of optimization algorithm to the binary backoff time are conducted, DCF(Distributed Coordination Function)-based access solutions are analyze. The simulation of MAC(media access control) and PHY(Physical Layer）functi

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Janczak, Tomasz, Jerzy Konorski, Józef Woźniak, and Krzysztof Pawlikowski. "Modulo N Backoff Scheme for Effective QoS Differentiation and Increased Bandwidth Utilization in IEEE 802.11 Networks." Journal of Telecommunications and Information Technology, no. 2 (June 26, 2023): 41–47. http://dx.doi.org/10.26636/jtit.2009.2.926.

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The paper presents a new modulo N channel access scheme for wireless local area networks (WLANs). The novel solution derives from the distributed coordination function (DCF) of the IEEE 802.11 standard, further elaborated as enhanced distribution channel access (EDCA) by the 802.11e draft specification. The main innovation concerns improvement of the binary exponential backoff scheme used for collision avoidance in 802.11 networks. The most appealing feature of the new modulo N backoff scheme is that it outperforms the original 802.11 solution in terms of channel utilization ratio under any tr

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Lei, Jianjun, Ying Wang, and Hong Yun. "Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs." Future Internet 12, no. 1 (2019): 3. http://dx.doi.org/10.3390/fi12010003.

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Legacy IEEE 802.11 Medium Access Control (MAC) adopts the Distributed Coordination Function (DCF) mechanism, which provides the same access opportunity for all contenders. However, in dense multi-rate Wireless Local Area Networks (WLANs), the pure distributed control mechanism will cause high collision rate and performance anomaly, which results in low network utilization and wasting valuable channel resources. In this paper, we present a decoupling MAC mechanism (DMAC) based on the idea of contention/reservation to reduce collision and realize collision free data transmission. In proposed mec

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A.B, Nataraju, and Hariprasad S.A. "Performance Characterization of IEEE 802.11s Compatible MAC Protocols." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 2336–44. https://doi.org/10.35940/ijeat.C5693.029320.

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Wireless Mesh Network (WMN) [1] deployment based on IEEE 802.11s [2] standard is a popular choice in setting up cost-efficient alternative to support broadband internet services to a larger population. They can provide network connectivity over large geography when compared to WLANs. WMN makes use of Distributed Coordination Function (DCF) Medium Access Control (MAC) protocol with Binary Exponential Backoff (BEB) algorithm to avoid collision due to simultaneous transmissions by more than one user at the same time. These collisions bring the network performance drastically down if not handled p

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Khomami, Prakash, Golnar Khomami, and Fernando Fontan. "The Relation between the Probability of Collision-Free Broadcast Transmission in a Wireless Network and the Stirling Number of the Second Kind." Mathematics 6, no. 7 (2018): 127. http://dx.doi.org/10.3390/math6070127.

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The broadcast performance of the 802.11 wireless protocol depends on several factors. One of the important factor is the number of nodes simultaneously contending for the shared channel. The Medium Access Control (MAC) technique of 802.11 is called the Distributed Coordination Function (DCF). DCF is a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) scheme with binary slotted exponential backoff. A collision is the result of two or more stations transmitting simultaneously. Given the simplicity of the DCF scheme, it was adapted for Dedicated Short Range Communication (DSRC) bas

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Pang, Yimin, Alireza Babaei, Jennifer Andreoli-Fang, and Belal Hamzeh. "Wi-Fi Coexistence with Duty Cycled LTE-U." Wireless Communications and Mobile Computing 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6486380.

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Coexistence of Wi-Fi and LTE-Unlicensed (LTE-U) technologies has drawn significant concern in industry. In this paper, we investigate the Wi-Fi performance in the presence of duty cycle based LTE-U transmission on the same channel. More specifically, one LTE-U cell and one Wi-Fi basic service set (BSS) coexist by allowing LTE-U devices to transmit their signals only in predetermined duty cycles. Wi-Fi stations, on the other hand, simply contend the shared channel using the distributed coordination function (DCF) protocol without cooperation with the LTE-U system or prior knowledge about the du

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Cheng, Yujun, Huachun Zhou, and Dong Yang. "CA-CWA: Channel-Aware Contention Window Adaption in IEEE 802.11ah for Soft Real-Time Industrial Applications." Sensors 19, no. 13 (2019): 3002. http://dx.doi.org/10.3390/s19133002.

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In 2016, the IEEE task group ah (TGah) released a new standard called IEEE 802.11ah, and industrial Internet of Things (IoT) is one of its typical use cases. The restricted access window (RAW) is one of the core MAC mechanisms of IEEE 802.11ah, which aims to address the collision problem in the dense wireless networks. However, in each RAW period, stations still need to contend for the channel by Distributed Coordination Function and Enhanced Distributed Channel Access (DCF/EDCA), which cannot meet the real-time requirements of most industrial applications. In this paper, we propose a channel-

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Wu, Qiong, Siyang Xia, Pingyi Fan, Qiang Fan, and Zhengquan Li. "Velocity-Adaptive V2I Fair-Access Scheme Based on IEEE 802.11 DCF for Platooning Vehicles." Sensors 18, no. 12 (2018): 4198. http://dx.doi.org/10.3390/s18124198.

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Platooning strategy is an important component of autonomous driving technology. Autonomous vehicles in platoons are often equipped with a variety of on-board sensors to detect the surrounding environment. The abundant data collected by autonomous vehicles in platoons can be transmitted to the infrastructure through vehicle-to-infrastructure (V2I) communications using the IEEE 802.11 distributed coordination function (DCF) mechanism and then uploaded to the cloud platform through the Internet. The cloud platform extracts useful information and then sends it back to the autonomous vehicles respe

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Lee, Jin-Lee, and Yeunwoong Kyung. "AP-based CW Synchronization Scheme in IEEE 802.11 WLANs." JOIV : International Journal on Informatics Visualization 5, no. 2 (2021): 194. http://dx.doi.org/10.30630/joiv.5.2.553.

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In this paper, an optimal CW (Contention Window) synchronization scheme is proposed in IEEE 802.11 WLANs. IEEE 802.11 WLANs operates with DCF (Distributed Coordination Function) mode for the MAC (Medium Access Control). In DCF, CW becomes the minimum CW according to the success of data transmissions and increases exponentially due to the collisions. In this situation, the smaller value of the minimum CW can increase the collision probability because stations have higher opportunity to access the medium. On the other hand, the higher value of the minimum CW will delay the transmission, which ca

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Kakria, Arvind, and Trilok Chand Aseri. "An Efficient Distributed Single-hop Relay Supporting (EDSRS) MAC Protocol for Wireless Sensor Networks." International Journal of Sensors, Wireless Communications and Control 9, no. 2 (2019): 153–64. http://dx.doi.org/10.2174/2210327908666180801125223.

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Background & Objective: Wireless communication has immensely grown during the past few decades due to significant demand for mobile access. Although cost-effective as compared to their wired counterpart, maintaining good quality-of-service (QoS) in these networks has always remained a challenge. Multiple-input Multiple-output (MIMO) systems, which consists of multiple transmitter and receiver antennas, have been widely acknowledged for their QoS and transmit diversity. Though suited for cellular base stations, MIMO systems are not suited for small-sized wireless nodes due to their hardware

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Alwer, Abdulkader O., Jawad Rasheed, Adnan M. Abu-Mahfouz, and Parvaneh Shams. "Study and Evaluation of Quality of Services in Mobile Internet Protocol v6 Using IEEE802.11e." Wireless Communications and Mobile Computing 2022 (November 17, 2022): 1–11. http://dx.doi.org/10.1155/2022/3092512.

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Mobile Internet Protocol v6 (MIPv6) is a protocol that allows a mobile node (MN) to transparently maintain connections while moving from one subnet to another. Using the route optimization (RO) method in MIPv6 gives optimized routing and helps avoid triangular routing. In real-time applications such as video conference applications, quality of service (QoS) issues will increase especially in the handover process between subnets. This study investigates the performance of MIPv6 handover in IEEE802.11e standard in wireless environments. The investigation considers that handover for the MN moves

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Hu, Xing, Linhua Ma, Shaocheng Huang, Tianyu Huang, and Shiping Liu. "Dynamic Channel Slot Allocation Scheme and Performance Analysis of Cyclic Quorum Multichannel MAC Protocol." Mathematical Problems in Engineering 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/8580913.

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In high diversity node situation, multichannel MAC protocol can improve the frequency efficiency, owing to fewer collisions compared with single-channel MAC protocol. And the performance of cyclic quorum-based multichannel (CQM) MAC protocol is outstanding. Based on cyclic quorum system and channel slot allocation, it can avoid the bottleneck that others suffered from and can be easily realized with only one transceiver. To obtain the accurate performance of CQM MAC protocol, a Markov chain model, which combines the channel-hopping strategy of CQM protocol and IEEE 802.11 distributed coordinat

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