Which three factors determine Wi‑Fi air time efficiency?

Wi-Fi air time efficiency is directly impacted by how much data can be transmitted in a given period. Data rate, determined by modulation density (e.g., QAM), dictates how many bits per symbol can be sent. Higher QAM values mean more data per symbol. Channel bandwidth defines the width of the frequency spectrum used for transmission; wider channels allow for more data to be sent simultaneously. The number of spatial streams (MIMO) allows multiple independent data streams to be transmitted over the same frequency, increasing throughput. Spatial reuse (e.g., OBSS/SR) allows devices to transmit concurrently if they are far enough apart, reducing contention. RF group leader, dynamic channel assignment, and event-driven RRM are functions of a wireless controller or access point that manage the RF environment but do not directly determine the fundamental air time efficiency of a single transmission.