Data networks (2nd ed.)
Principles of mobile communication (2nd ed.)
Principles of mobile communication (2nd ed.)
Theory, Volume 1, Queueing Systems
Theory, Volume 1, Queueing Systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Markov chain analysis of uplink subframe in polling-based WiMAX networks
Computer Communications
An empirically based path loss model for wireless channels in suburban environments
IEEE Journal on Selected Areas in Communications
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We investigate in this paper the implications of scheduling and adaptive modulation and coding AMC on the performance of downlink traffic in OFDMA-based IEEE 802.16 cells. To this end, we model the downlink traffic as a discrete-time Markov chain by assuming exponential interarrival times of packets at the upstream of the unidirectional unbuffered connection maintained by the base station with each associated subscriber station SS. Various performance metrics are derived by considering two usual scheduling policies: equal-slot sharing ESS and equal-throughput sharing ETS. In particular, the estimated packet access delays provide a lower bound on the achieved delays in case of buffering. Besides, our model considers the adaptivity of the modulation and coding schemes MCSs used by the base station. By assuming uniform distribution of the SSs over the cell and shadowing log-normal radio propagation, we derive the probability density function of the signal-to-noise ratios measured at the level of the SSs. Albeit defined in the context of WiMAX networks, this second contribution can be exploited in more generic wireless settings. Several numerical results are presented and discussed to expose the effects of system parameters and scheduling policies on performance.