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Thread: Performance Modelling and Bandwidth Management of WiMAX Systems

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    Default Performance Modelling and Bandwidth Management of WiMAX Systems

    Performance Modelling and Bandwidth Management of WiMAX Systems
    Abstract—Worldwide Interpretability for Microwave Access
    (WiMAX) is a competitive connection oriented technology for
    metropolitan broadband wireless access with very high data rate,
    large service coverage and flexible quality of service (QoS). Due
    to the large number of connections, the efficient bandwidth
    management and related channel allocation for the uplink access
    in WiMAX networks is a very challenging task of the medium
    access control (MAC) protocol. In order to provide better
    bandwidth utilization and network throughput, a cost-effective
    WiMAX bandwidth management scheme is devised, named as
    the WiMAX partial sharing scheme (WPSS) and compared
    against a simpler scheme, named as the WiMAX complete
    sharing scheme (WCPS). An analytic maximum entropy (ME)
    model is proposed for the cost-effective performance evaluation
    of the two bandwidth management schemes associated with
    networks with a large number of stations and/or the connections.
    In this context, an open queueing network model (QNM) is
    devised, consisting of interacting queues with multiple service
    classes and closed form expressions for the state and blocking
    probability distributions are derived. Typical numerical
    examples are employed to verify the credibility of the analytic
    ME solutions against simulation results at 95 % confidence
    intervals. Moreover, it is shown that the WPSS can significantly
    improve the networks performance in comparison to that of the
    WCPS.

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