CWFC: A contention window fuzzy controller for QoS support on IEEE 802.11e EDCA

Recent literature shows the limitations of the IEEE 802.11e protocol when handling real-time industrial traffic. This paper proposes an approach to overcome some of these limitations and improve the QoS support for real-time traffic, with only minor changes to the IEEE standard. The proposed approach tries to reduce the number of collisions, so that the available bandwidth is used more efficiently by the real-time data traffic, especially in high traffic conditions. This is achieved through a dynamic adaptation of the back-off parameters CWmin and CWmax for the different access categories. Such an adaptive control is performed by a fuzzy-logic controller, that takes into account both the throughput and frame retransmission count.

[1]  A. Girotra,et al.  Performance Analysis of the IEEE 802 . 11 Distributed Coordination Function , 2005 .

[2]  Zaher Dawy,et al.  Adaptive approach for QoS support in IEEE 802.11e wireless LAN , 2005, WiMob'2005), IEEE International Conference on Wireless And Mobile Computing, Networking And Communications, 2005..

[3]  Ricardo Moraes,et al.  Simulation Analysis of the IEEE 802.11e EDCA Protocol for an Industrially-Relevant Real-Time Communication Scenario , 2006, 2006 IEEE Conference on Emerging Technologies and Factory Automation.

[4]  Yang Xiao.  Performance analysis of IEEE 802.11e EDCF under saturation condition , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[5]  L. L. Bello,et al.  An approach to enhance the QoS support to real-time traffic on IEEE 802 . 11 e networks , 2007 .

[6]  Brahim Bensaou,et al.  Performance analysis of IEEE 802.11e contention-based channel access , 2004, IEEE Journal on Selected Areas in Communications.

[7]  Thierry Turletti,et al.  Adaptive EDCF: enhanced service differentiation for IEEE 802.11 wireless ad-hoc networks , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..