Achieving Weighted Fairness and Efficient Channel Utilization in IEEE 802.11e WLANs

Wei ZHANG  Jun SUN  Xinbing WANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.2   pp.653-657
Publication Date: 2008/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.2.653
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
IEEE 802.11e,  parameter configuration,  performance analysis,  protocol capacity,  wireless LAN,  

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This paper addresses the problem of maximizing the protocol capacity of 802.11e networks, under the assumption that each access category (AC) has the same packet length. We prove that the maximal protocol capacity can be achieved at an optimal operating point with the medium idle probability of , where Tc* is the duration of collision time in terms of slot unit. Our results indicate that the optimal operating point is independent of the number of stations and throughput ratio among ACs, which means the proposed analytical results still hold even when throughput ratio and station number are time-varying. Further, we show that the maximal protocol capacity can be achieved in saturated cases by properly choosing the protocol parameters. We present a parameter configuration algorithm to achieve both efficient channel utilization and proportional fairness in IEEE 802.11e EDCA networks. Extensive simulation and analytical results are presented to verify the proposed ideas.