| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 105 === Confronting the dense scenario, 802.11ax, the next generation WLAN, makes revolutionary modifications on both MAC and PHY layers, exploiting MU-OFDMA PHY and centralized MAC scheme. A multi-channel random access mechanism, OFDMA-based random access (OBRA) is proposed. This work extends Bianchi’s bi-dimension Markov chain model to depict the steady-state behavior of the OBRA under saturation condition. And simulations validate the accuracy of the Markov chain model. Finally, the effects of system parameters, including the number of resource units (RUs) for random access, initial and maximum contention window, are evaluated.
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