Impact of 802.11e EDCA on mixed TCP-based applications
WICON '06 Proceedings of the 2nd annual international workshop on Wireless internet
Applications and challenges of the 802.11e EDCA mechanism: an experimental study
IEEE Network: The Magazine of Global Internetworking
SB-DRED: a novel congestion control algorithm for H.264 video streaming over 802.11e
International Journal of Grid and Utility Computing
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The transmission opportunity (TXOP) mechanism defined in the IEEE 802.11e Hybrid Coordination Function (HCF) allows a wireless station to transmit a burst of frames back-to-back without re-entering the channel contention phase. Unfortunately, the adoption of a unique value for its maximum duration (named TXOPlimit) for all stations, included the AP, results in an unfair behavior, that provokes an unbalance between uplink and downlink throughputs and consequent QoS degradation. To solve this problem we propose an algorithm capable of tuning the TXOPlimit value at the AP, in order to dynamically change its channel resources according to the current traffic conditions. Extensive simulations show that the proposed algorithm allows to enhance significantly QoS performance of multimedia traffics and to increase the global WLAN throughput.