An Autonomous Distributed Admission Control Scheme for IEEE 802.11 DCF

Admission control as a mechanism for providing QoS requires an accurate description of the requested flow as well as already admitted flows. Since 802.11 WLAN capacity is shared between flows belonging to all stations, admission control requires knowledge of all flows in the WLAN. Further, estimation of the load-dependent WLAN capacity through analytical model requires inputs about channel data rate, payload size and the number of stations. These factors combined point to a centralized admission control whereas for 802.11 DCF it is ideally performed in a distributed manner. The use of measurements from the channel avoids explicit inputs about the state of the channel described above. BUFFET, a model based measurementassisted distributed admission control scheme for DCF proposed in this paper relies on measurements to derive model inputs and predict WLAN saturation, thereby maintaining average delay within acceptable limits. Being measurement based, it adapts to heterogeneous flow...

• Type: Journal
• Year: 2007
• Where: CORR
• Authors: Preetam Patil, Varsha Apte
• Keywords: Admission Control, Analytical Models, CORR 2007, Education, WLAN Capacity