A new EIFS strategy for IEEE 802.11e wireless LANs
Mobility '08 Proceedings of the International Conference on Mobile Technology, Applications, and Systems
Multi-service traffic profiles to realise and maintain QoS guarantees in wireless LANs
Computer Communications
A delay monitoring method for up-link flows in IEEE 802.11e EDCA networks
Proceedings of the 2nd International Conference on Simulation Tools and Techniques
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Currently deployed IEEE 802.11 WLANs work mostlywith Distributed Coordination Function (DCF) mode at theMAC layer, which does not provide QoS support. The upcomingIEEE standard 802.11e achieves service differentiationby assigning different Channel Access Parameters(CAPs) to different traffic classes at the MAC layer. However,such relative differentiation does not yield QoS guarantee.In practice, appropriately selecting CAPs a prioriis difficult. Time-varying traffic loads also make the use offixed CAPs inefficient for both QoS support and channel utilization.In this work, we propose a novel architecture calledHARMONICA, in which the access point dynamically selectsthe best CAPs for each traffic class to optimally matchtheir QoS requirements. We present and discuss a simple admissioncontrol mechanism used by HARMONICA to avoidcongestion. Our simulation results demonstrate that underan interference-free environment, HARMONICA can guaranteethe QoS for all traffic classes while simultaneouslyachieving quasi-optimal channel utilization.