WLAN Systems and Wireless IP for Next Generation Communications
WLAN Systems and Wireless IP for Next Generation Communications
Bandwidth tradeoff between TCP and link-level FEC
Computer Networks: The International Journal of Computer and Telecommunications Networking
On Evaluating Loss Performance Deviation: A Simple Tool and Its Practical Implications
QoS-IP 2003 Proceedings of the Second International Workshop on Quality of Service in Multiservice IP Networks
Quality of service schemes for IEEE 802.11 wireless LANs: an evaluation
Mobile Networks and Applications
A scheduling algorithm for QoS support in IEEE802.11 networks
IEEE Wireless Communications
A survey of quality of service in IEEE 802.11 networks
IEEE Wireless Communications
An efficient multipolling mechanism for IEEE 802.11 wireless LANs
IEEE Transactions on Computers
QoS enhancement in IEEE 802.11 wireless local area networks
IEEE Communications Magazine
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
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IEEE 802.11 Wireless Local Area Networks (WLANs) are a fundamental tool for enabling ubiquitous wireless networking. Their use has been essentially focused on best effort data transfer because the basic access methods defined in the 802.11 standard cannot provide delay guarantees to real-time flows. To overcome this limitation, the 802.11e working group has recently proposed the Hybrid Coordination Function (HCF), which is an enhanced access method that allows service differentiation within WLAN's. While the 802.11e proposal gives a flexible framework to address the issue of service differentiation in WLAN's, it does not specifies effective algorithms to really achieve it. This paper compares the performance of standard access methods proposed by the 802.11e working group with a novel Feedback Based Dynamic Scheduler (FBDS), which is compliant to 802.11e specifications. Simulation results, obtained using the ns-2 simulator, have shown that FBDS guarantees bounded delays to real-time flows for a very broad set of network loads and packet loss probabilities, whereas, analogous algorithms proposed by the 802.11e working group fail in presence of high network load.