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DPS: An Architecture for VBR Scheduling in IEEE 802.11e HCCA Networks with Multiple Access Points

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Abstract

Recent advances in 802.11 Wireless Local Area Networks (WLANs) have been focused on introducing Quality of Service (QoS) in their performance through the adoption of 802.11e. The Hybrid Controlled Channel Access (HCCA) has been proposed as the mechanism to provide the means for guaranteed QoS in networks controlled by a single Access Point (AP). Moreover, scheduling algorithms have been developed allowing efficient scheduling of Variable Bit Rate (VBR) traffic flows. However, little research may be found regarding the problem of applying HCCA on networks with multiple APs. In this paper, various VBR scheduling mechanisms and methods for multi—AP HCCA are presented and evaluated. In addition, this paper introduces the Dynamic Parallel Scheduler (DPS), a novel HCCA scheduling algorithm for VBR traffic among multiple APs that takes advantage of the rate variability and spatial reuse. DPS’s performance evaluation shows that the proposed scheme achieves improved performance in terms of delay, throughput and packet loss.

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Acknowledgement

This paper is part of the 03ED485 - “Design and Development Models for QoS Provisioning in Wireless Broadband Networks” research project, implemented within the framework of the “Reinforcement Programme of Human Research Manpower” (PENED) and co-financed by National and Community Funds (20% from the Greek Ministry of Development-General Secretariat of Research and Technology and 80% from E.U.-European Social Fund).

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Authors and Affiliations

  1. School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytexneiou 7, Zografou, Athens, GR-157 73, Greece

    Dimitrios J. Vergados

  2. Department of Informatics, University of Piraeus, 80, Karaoli & Dimitriou St., Piraeus, GR-185 34, Greece

    Dimitrios D. Vergados & Christos Douligeris

  3. Department of Information and Communication Systems Engineering, University of the Aegean, Karlovassi, Samos, 832 00, Greece

    Dimitrios D. Vergados

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  1. Dimitrios J. Vergados
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  2. Dimitrios D. Vergados
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Correspondence to Dimitrios D. Vergados.

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Vergados, D.J., Vergados, D.D. & Douligeris, C. DPS: An Architecture for VBR Scheduling in IEEE 802.11e HCCA Networks with Multiple Access Points. Mobile Netw Appl 14, 744–759 (2009). https://doi.org/10.1007/s11036-008-0126-5

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