QoS Enhancement with Dynamic TXOP Allocation in IEEE 802.11e

The transmission opportunity (TXOP) mechanism defined in the IEEE 802.11 e Hybrid Coordination Function (HCF) is not optimized to meet the QoS requirements of heterogeneous applications, since it is usually allocated by default according to the different Access Categories (AC). In this paper we propose a new algorithm, named DTXOP, for the dynamic assignment of the TXOP maximum duration at the Access Point (AP) of an IEEE 802.lie WLAN. DTXOP is periodically updated according to the current traffic conditions of each specific AC. Simulation experiments show that DTXOP allows to enhance delay and throughput performance and to maintain fairness between upstream and downstream channel access times.

[1]  Ilenia Tinnirello,et al.  Temporal fairness provisioning in multi-rate contention-based 802.11e WLANs , 2005, Sixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks.

[2]  Yuguang Fang,et al.  Providing statistical QoS guarantee for voice over IP in the IEEE 802.11 wireless LANs , 2006, IEEE Wireless Communications.

[3]  F.C. Palacio,et al.  Dynamic TXOP configuration for Qos enhancement in IEEE 802.11e wireless LAN , 2006, 2006 International Conference on Software in Telecommunications and Computer Networks.

[4]  Marina Thottan,et al.  Impact of 802.11e EDCA on mixed TCP-based applications , 2006, WICON '06.

[5]  G. Benelli,et al.  Evaluation of QoS Support for Multimedia Traffics in IEEE 802.11e , 2006, 2006 International Conference on Software in Telecommunications and Computer Networks.

[6]  N. Sai Shankar.  Multimedia Wireless Local Area Networks , 2006 .

[7]  Yang Xiao.  QoS guarantee and provisioning at the contention-based wireless MAC layer in the IEEE 802.11e wireless LANs , 2006, IEEE Wirel. Commun..

[8]  T. Janevski,et al.  Analysis of IEEE 802.11e QoS in multimedia environment , 2005, TELSIKS 2005 - 2005 uth International Conference on Telecommunication in ModernSatellite, Cable and Broadcasting Services.

[9]  Mário Serafim Nunes,et al.  Performance evaluation of IEEE 802.11e , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Sunghyun Choi,et al.  IEEE 802.11 e contention-based channel access (EDCF) performance evaluation , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[11]  Hongqiang Zhai,et al.  Supporting QoS in IEEE 802.11e wireless LANs , 2006, IEEE Transactions on Wireless Communications.

[12]  Arturo Azcorra,et al.  Applications and challenges of the 802.11e EDCA mechanism: an experimental study , 2005, IEEE Network.