6th International ICST Symposium on Modeling and Optimization

Research Article

A Statistical Hybrid Traffic Control for IEEE 802.11e WLANs

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  • @INPROCEEDINGS{10.4108/ICST.WIOPT2008.3001,
        author={Paolo Giacomazzi, and Luigi Musumeci and Gabriella Saddemi and Giacomo Verticale},
        title={A Statistical Hybrid Traffic Control for IEEE 802.11e WLANs},
        proceedings={6th International ICST Symposium on Modeling and Optimization},
        keywords={Analytical models Call admission control Communication system traffic control Delay estimation Radio control Road accidents Testing Throughput Traffic control Wireless LAN},
  • Paolo Giacomazzi,
    Luigi Musumeci
    Gabriella Saddemi
    Giacomo Verticale
    Year: 2008
    A Statistical Hybrid Traffic Control for IEEE 802.11e WLANs
    DOI: 10.4108/ICST.WIOPT2008.3001
Paolo Giacomazzi,1,*, Luigi Musumeci1,*, Gabriella Saddemi1,*, Giacomo Verticale1,*
  • 1: Politecnico di Milano, Dept. of Electronics and Information, Piazza Leonardo Da Vinci 32, 20133 Milano, ITALY Tel.: +39-02-2399.3657 – Fax: +39-02-2399.3413
*Contact email: giacomaz@elet.polimi.it, musumeci@elet.polimi.it, saddemi@elet.polimi.it, vertical@elet.polimi.it


The IEEE 802.11e WLAN supports prioritized Qual-ity of Services (QoSs), but it needs additional mechanisms to sup-port also the strict QoS required by real-time services. It has been shown that best performance is achieved when the WLAN is unsaturated. Therefore, a call admission control scheme is re-quired to maintain the WLAN working in the unsaturated case. In this paper, we propose an analytical model for the capacity as-signment necessary to satisfy the delay requirements for a given number of real-time flows belonging to two different traffic classes. At the same time, our analysis includes a rate control al-gorithm, as proposed in literature, that allows the best-effort traf-fic to fully use the residual bandwidth left by the real-time traffic, thereby achieving high channel utilization.