Analysis of the Effectiveness of TWT and R-TWT Mechanisms in Servicing Latency-Sensitive Traffic

The key elements of Industrial Internet of Things networks are RTA (Real-Time Application) stations, which detect events and deliver alerts about them within a limited time with high probability. Since such stations are often located in hard-to-reach places and cannot always be connected to the power supply, they must consume little energy. A promising solution for ensuring low latency and energy consumption is the use of Target Wake Time (TWT) and Restricted Target Wake Time (R-TWT) mechanisms, introduced in the latest Wi-Fi standards: Wi-Fi 6 and Wi-Fi 7. However, the effectiveness of using these mechanisms in a heterogeneous network consisting of both RTA stations and regular stations operating in saturation mode has not been studied extensively. In this paper, we conduct a comparative study of the effectiveness of using TWT and R-TWT mechanisms in scenarios of low-intensity traffic service for RTA stations. To do this, we develop an analytical model that, for the first time, makes it possible to evaluate the probability of RTA station frame delivery within a given time and the throughput for regular stations.