Neural Computing and Applications

, Volume 31, Issue 10, pp 6113–6128 | Cite as

Fuzzy logic-based performance improvement on MAC layer in wireless local area networks

  • Cemal KocakEmail author
  • Hacı Bayram Karakurt
Original Article


There are many studies that have been done to improve the quality of service of wireless local area networks (WLANs). Institute of Electrical and Electronic Engineers (IEEE) WLAN are based on IEEE 802.11 protocol. The 802.11e medium access control (MAC) protocol is generally recommended for efficient quality of service in WLANs. There are many parameters in the MAC protocol that affect quality of services. Among these parameters, request to send threshold value (RSTV), fragmentation threshold value (FTV) and buffer size (BS) directly affect network performance. RSTV is used in the request to send/clear to send (RTS/CTS) mechanism in the carrier sense multiple access with collision avoidance (CSMA/CA) protocol for collision prevention. This parameter specifies the threshold used to activate the CSMA/CA protocol. FTV is another parameter that is used to send large-sized packets by dividing them into appropriate fragments during CSMA/CA transmission and reduces packet loss in WLAN. BS is another parameter that has a significant cost in the CSMA/CA model and also directly affects the performance. In this article, to improve the performance of WLANs, OPNET Modeler was used and ideal values were obtained for RSTV, FTV and BS by using fuzzy logic-based method. The values obtained by fuzzy logic were re-tested in OPNET Modeler, and the achieved improvement was as follows: for delay 36–38%, for load 2–10% and for throughput 25–44%, respectively. Thus, in WLANs, performance was improved by using fuzzy logic-based method.


Wireless local area network Request to send threshold Fragmentation threshold Buffer size Fuzzy logic 



Quality of service


Wireless local area networks


Medium access control


Request to send threshold value


Fragmentation threshold value


Buffer size


Request to send/clear to send


Carrier sense multiple access with collision avoidance


Distributed coordination function


Voice over internet protocol


Access point


Short interframe space


Network allocation vector




Distribution interframe space


Short interframe space


Artificial neural network


Particle swarm optimization


Genetic algorithm


Bandwidth-delay product












Very long


Very short

List of symbols








RSTV (byte)


FTV (byte)


BS (bits)


Other mandatory inputs


Euler number


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© The Natural Computing Applications Forum 2018

Authors and Affiliations

  1. 1.Computer Engineering Department, Faculty of TechnologyGazi UniversityAnkaraTurkey
  2. 2.Institute of Science, Faculty of TechnologyGazi UniversityAnkaraTurkey

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