A Call Admission and Rate Control Scheme for Multimedia Support over IEEE 802.11 Wireless LANs
QSHINE '04 Proceedings of the First International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks
Sizing of IEEE 802.11 wireless LANs
Proceedings of the 3rd ACM international workshop on Wireless mobile applications and services on WLAN hotspots
How well can the IEEE 802.11 wireless LAN support quality of service?
IEEE Transactions on Wireless Communications
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
Cross-layer approach for supporting QoS in IEEE802.11 DCF wireless LANs
Proceedings of the 6th ACM workshop on QoS and security for wireless and mobile networks
| Hi-index | 0.00 |
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 measurement-assisted 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 flows too, making it completely autonomous and distributed. Performance analysis and comparison with two other schemes using OPNET simulations suggests that BUFFET is able to ensure average delay under 7ms at a near-optimal throughput.