Performance Evaluation of Wi-Fi 7 Networks with Restricted Target Wake Time

We study a most recent mechanism for reserving channel resources to deliver high-priority traffic in Wi-Fi networks, Restricted Target Wake Time (R-TWT). We develop an analytical model of a Wi-Fi network using the R-TWT mechanism, which allows us to estimate the throughput of users transmitting low-priority traffic, depending on the R-TWT reservation period, restrictions on the size of transmitted frames and modulation and coding schemes used. The model shows that the dependence of the user throughput on the R-TWT period is not monotonic, and a slight increase in the R-TWT period can lead to both an increase and a significant drop in the user throughput.