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Wireless & Mobility · Advanced

Overlapping BSS Packet Detect (OBSS_PD)

An adjustable CCA threshold for inter-BSS frames used in 802.11ax spatial reuse.

Definition

When a station detects an OBSS frame (different BSS color) below its OBSS_PD threshold, it may ignore it and transmit with reduced power. The default threshold is -82 dBm and can be raised up to -62 dBm. It works in conjunction with transmit power restrictions.

Exam tip

Higher OBSS_PD means more aggressive reuse but requires lower TX power.

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