  This study aims to enhance spatial reuse by using the new features of IEEE
802.11ax WLANs. Since the wireless medium is a shared medium and there may be
multiple basic service sets (BSS) in the same vicinity, BSSs may overlap, and
interference occurs. In this situation, BSSs cannot transmit simultaneously due
to the exposed node problem. The IEEE 802.11ax standard has a couple of
mechanisms to resolve these spectral efficiency problems. One of the most
effective mechanisms that address these problems is the overlapping BSS
preamble detection (OBSS/PD) mechanism. OBSS/PD mechanism uses the color
mechanism to distinguish OBSS signals. By using a signal threshold, the
mechanism can ignore some of the signals, which cause interference. In this
paper, we propose a rate-adaptive dynamic OBSS/PD threshold algorithm that
tracks the changes in transmission rate and dynamically adjusts the threshold
step by step considering the changes.
