The aim of the study is to determine theoretically substantiated limitations of voice traffic transmission in IEEE 802.11ac wireless networks with mixed traffic prioritization. A mathematical model of IEEE 802.11 standard wireless network operation based on the virtual contention window concept was applied for the research. Voice frame parameters were selected corresponding to the G.711 codec, the results of which can be extended to voice traffic generated by other modern codecs. The prioritization mechanisms of the IEEE 802.11e standard were analyzed, implemented through reduced mandatory waiting time and shortened additional waiting interval for high-priority frames. Numerical data on the probability of transmitting AC_VO voice traffic frames in competition with AC_BE general priority traffic were obtained. It was established that the probability of transmitting a voice frame on the first attempt when selecting a "zero" time slot ranges from 0.98 (one voice station and two general priority stations) to 0.922 (eight voice stations and sixteen general priority stations). For voice stations in competition mode, the probability of successful transmission on the first attempt ranges from 0.795 to 0.527 depending on the number of stations with saturated load. It was determined that the probability of transmitting voice frames using retransmission attempts in the presence of consecutive collisions is at least 0.98 when using six retransmission attempts. Further development of the method for evaluating performance characteristics of IEEE 802.11 wireless networks using the virtual contention window mathematical model for networks with prioritized traffic was obtained. The obtained results are useful for optimizing the operation and designing IEEE 802.11ac standard local wireless networks with VoIP functionality.
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