Providing QoS in Congested IEEE 802.11 Hot Spots
DFMA '05 Proceedings of the First International Conference on Distributed Frameworks for Multimedia Applications
IEEE 802.11e: QoS provisioning at the MAC layer
IEEE Wireless Communications
Supporting service differentiation in wireless packet networks using distributed control
IEEE Journal on Selected Areas in Communications
Estimating maximum and minimum delays for wireless discrete networked control systems
WTS'09 Proceedings of the 2009 conference on Wireless Telecommunications Symposium
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In this paper, we propose a modified EDCF scheme, M-EDCF, to improve the Quality of Service (QoS) of the IEEE 802.11e wireless network. The IEEE 802.11e standard is presented to support QoS at medium access control level using a priority scheme by differentiating the inter-frame space and the initial window size. In addition to providing relative priorities by adjusting the size of the Contention Window (CW) of each traffic class, our proposed scheme, M-EDCF, also consider the effect of a back_off_timer to avoid unnecessary collisions. Our study shows that in either in heavy or light traffic load our proposed scheme can provide better quality for both high priority and low priority packets than either the AEDCF [L. Romdhani, Ni. Qiang, T. Turletti, Adaptive EDCF: enhanced service differentiation for IEEE 802.11 wireless ad-hoc networks, IEEE Wireless Communications and Networking, Conference. vol. 2, March (2003) pp. 16-20] or the original EDCF.