TY - CONF T1 - Channel Access Throttling for Improving WLAN QoS T2 - Sensor, Mesh and Ad Hoc Communications and Networks, 2009. SECON '09. 6th Annual IEEE Communications Society Conference on Y1 - 2009 A1 - Han,Bo A1 - Ji,Lusheng A1 - Lee,Seungjoon A1 - Miller,R.R. A1 - Bhattacharjee, Bobby KW - 802.11 KW - access KW - area KW - call KW - capacity;data KW - capacity;quality KW - capacity;WLAN KW - categories;transmission KW - channel KW - device KW - distributed KW - driver;quality KW - facto KW - frames;de KW - IEEE KW - LAN; KW - LAN;VoIP KW - local KW - mechanism;member KW - method;enhanced KW - multimedia KW - network;wireless KW - networks;channel KW - of KW - parameters;channel KW - priority;channel KW - QoS KW - QoS;channel KW - service;telecommunication KW - service;traffic KW - standards;telecommunication KW - stations;open-source KW - throttling;channel KW - traffic;wireless KW - treatments;wireless KW - wireless AB - The de facto QoS channel access method for the IEEE 802.11 Wireless LANs is the Enhanced Distributed Channel Access (EDCA) mechanism, which differentiates transmission treatments for data frames belonging to different traffic categories with four different levels of channel access priority. In this paper, we propose extending EDCA with Channel Access Throttling (CAT) for more flexible and efficient QoS support. By assigning different member stations different channel access parameters, CAT differentiates channel access priorities not between traffic categories but between member stations. Then by dynamically changing the channel access parameters of each member station based on a pre-computed schedule, CAT enables EDCA WLANs the benefits of scheduled access QoS. We also present evaluation results of CAT obtained from both simulations and experiments conducted using off-the-shelf WLAN hardware and open-source device driver. Our results show that CAT can proportionally partition channel capacity, significantly improve performance of multimedia applications, effectively achieve performance protection for admitted flows, and increase per cell VoIP call capacity by up to 41%. JA - Sensor, Mesh and Ad Hoc Communications and Networks, 2009. SECON '09. 6th Annual IEEE Communications Society Conference on M3 - 10.1109/SAHCN.2009.5168915 ER -