The paper investigates the performance of packet loss rate and packet time delay in IEEE 802.11 wireless local area networks (WLANs) with distributed coordination function (DCF). We derive an analytical model to study these performance metrics in terms of the data payload length, wireless channel condition, adopted medium-access-control (MAC) retry limit and used physical-layer (PHY) modes. From the analysis results, it is shown that the modulation and coding schemes (MCSs) designed in a single-node scenario may not provide expected good performance in multiple-node 802.11 WLANs due to the effect of transmission collision. The developed analytical model can be used to determine appropriate MAC retry limits and PHY date rates according to the specific delay constraint and tolerable packet loss level.
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