Computer Controlled Systems: Theory and Design
Computer Controlled Systems: Theory and Design
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
An efficient multipolling mechanism for IEEE 802.11 wireless LANs
IEEE Transactions on Computers
Wireless LANs and mobile networking: standards and future directions
IEEE Communications Magazine
IEEE 802.11 Wireless Local Area Networks
IEEE Communications Magazine
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
Radio Resource Management with Utility and Pricing for Wireless LAN Hot-Spots
Wireless Personal Communications: An International Journal
Channel time allocation scheme based on feedback information in IEEE 802.11e wireless LANs
Computer Networks: The International Journal of Computer and Telecommunications Networking
Feedback-based control for providing real-time services with the 802.11e MAC
IEEE/ACM Transactions on Networking (TON)
MAC-layer QoS management for streaming rate-adaptive VBR video over IEEE 802.11e HCCA WLANs
Advances in Multimedia
An admission control algorithm for multi-hop 802.11e-based WLANs
Computer Communications
EURASIP Journal on Advances in Signal Processing
Energy efficient feedback-based scheduler for delay guarantees in IEEE 802.11e networks
Computer Communications
Improving the performance of IEEE 802.11e with an advanced scheduling heuristic
EPEW'06 Proceedings of the Third European conference on Formal Methods and Stochastic Models for Performance Evaluation
Providing delay guarantees and power saving in IEEE 802.11e network
WWIC'05 Proceedings of the Third international conference on Wired/Wireless Internet Communications
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The 802.11e working group has recently proposed innovative functionalities in order to support delay-sensitive multimedia applications, such as real-time voice and video, in Wireless Local Area Networks (WLANs). In particular, the 802.11e proposal introduces: (1) the Hybrid Coordination Function (HCF), which is an improved channel access method aimed at allocating the first-hop WLAN bandwidth to delay-insensitive and delay-sensitive flows; (2) a Call Admission Control (CAC) algorithm for preventing network overloads, which would drastically degrade the service offered by the network; (3) and a Signalling scheme for service request and QoS service level negotiation. This paper proposes a dynamic bandwidth allocation algorithm along with a measurement-based CAC algorithm for providing delay guarantees to real-time media flows in IEEE 802.11e networks. The dynamic bandwidth allocation algorithm has been designed using classic feedback control; whereas the CAC scheme is an extension of the one proposed by the 802.11e working group because it takes into account the actually used resources rather than the average rates declared by data sources. Both the schemes exploit the HCF Controlled Channel Access (HCCA) centralized access method. The proposed algorithms have been implemented in the ns-2 simulator and extensive computer simulations have been carried out to assess their validity. Simulation results have shown that proposed algorithms protect the WLAN from heavy overloads and guarantees bounded delays for multimedia flows, whereas, analogous algorithms proposed by the 802.11e working group fail for high network loads.