Computer-controlled systems (3rd ed.)
Computer-controlled systems (3rd ed.)
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 survey of QoS enhancements for IEEE 802.11 wireless LAN: Research Articles
Wireless Communications & Mobile Computing
Theory, Volume 1, Queueing Systems
Theory, Volume 1, Queueing Systems
A Per-Class QoS Service Model in IEEE 802.11e WLANs
Proceedings of the Second International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks
Computer Networking: A Top-Down Approach (4th Edition)
Computer Networking: A Top-Down Approach (4th Edition)
Video Traces for Network Performance Evaluation: A Comprehensive Overview and Guide on Video Traces and Their Utilization in Networking Research
Feedback-based control for providing real-time services with the 802.11e MAC
IEEE/ACM Transactions on Networking (TON)
Performance of Markov models for frame-level errors in IEEE 802.11 wireless LANs
International Journal of Communication Systems
A Novel MAC scheme for solving the QoS parameter adjustment problem in IEEE 802.11e EDCA
WOWMOM '08 Proceedings of the 2008 International Symposium on a World of Wireless, Mobile and Multimedia Networks
Distributed mechanisms for quality of service in wireless LANs
IEEE Wireless Communications
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
Performance analysis of IEEE 802.11e contention-based channel access
IEEE Journal on Selected Areas in Communications
QoS in Wireless LAN: A comparison between feedback-based and earliest due-date approaches
Computer Communications
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Despite their very broad diffusion, IEEE 802.11 Wireless Local Area Networks (WLANs) are not able to provide service differentiation and to support real-time multimedia applications, due to their channel access methods. To overcome these limitations, the 802.11e working group has proposed the Enhanced Distributed Coordination Access (EDCA) scheme, which achieves service differentiation on a statistical basis by properly mapping user Quality of Service (QoS) requirements to channel contention parameters. Such a scheme will be included in the emerging 802.11n standard and in the revision of the 802.11 standard. However, it has been widely demonstrated that, especially at high network loads, EDCA does not provide an effective usage of the channel capacity. In particular, it is unable to provide a bounded delay service to all kinds of multimedia flow because flows with lower channel access priorities are starved to advantage only those with the highest priority. To fix this undesired behavior and improve wireless LAN performance, this paper proposes a new Extended EDCA (E^2DCA) scheme, that is compliant with 802.11e specifications. By exploiting a closed-loop control algorithm, E^2DCA performs a distributed dynamic bandwidth allocation, providing guarantees on average/absolute delays to real-time media flows, regardless of their priorities. Moreover, an innovative Call Admission Control (CAC) procedure has been developed. Using the ns-2 simulator, the effectiveness of the algorithm has been investigated in realistic network scenarios, involving a mix of audio, video, and FTP flows, at several network loads and with random losses. Results have shown that the proposed scheme is able to provide a bounded delay service to multimedia flows in a wide range of network loads and frame loss ratios.