Research Article
An Autonomous Distributed Admission Control Scheme for IEEE 802.11 DCF
@INPROCEEDINGS{10.1145/1577222.1577287, author={Preetam Patil and Varsha Apte}, title={An Autonomous Distributed Admission Control Scheme for IEEE 802.11 DCF}, proceedings={4th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness}, publisher={ACM}, proceedings_a={QSHINE}, year={2007}, month={8}, keywords={Admission Control Measurements Wireless LANs Analyt- ical Models Simulations}, doi={10.1145/1577222.1577287} }- Preetam Patil
Varsha Apte
Year: 2007
An Autonomous Distributed Admission Control Scheme for IEEE 802.11 DCF
QSHINE
ACM
DOI: 10.1145/1577222.1577287
Abstract
Admission control as a mechanism for providing QoS re- quires 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, admis- sion control requires knowledge of all flows in the WLAN. Further, estimation of the load-dependent WLAN capac- ity 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 dis- tributed manner. The use of measurements from the chan- nel avoids explicit inputs about the state of the channel described above. BUFFET, a model based measurement- assisted distributed admission control scheme for DCF pro- posed 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 flows too, making it com- pletely autonomous and distributed. Performance analysis and comparison with two other schemes using OPNET sim- ulations suggests that BUFFET is able to ensure average delay under 7ms at a near-optimal throughput.