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Specify pre‑sounding signaling frames for Coordinated Beamforming

Define the specific frames to be exchanged between coordinating access points before each sounding phase in IEEE 802.11bn Coordinated Beamforming to indicate participation availability and communicate the capabilities of the stations to be sounded.

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Background

Coordinated Beamforming (Co‑BF) uses multi‑antenna precoding and interference nulling across APs to enable concurrent transmissions with reduced inter‑BSS interference.

The procedure requires reliable channel information and coordination; however, the exact pre‑sounding signaling frames APs should exchange prior to sounding are explicitly stated as still to be decided.

References

Furthermore, before starting each sounding phase, the APs involved in CBF are expected to exchange certain frames (which are to be decided) to indicate availability for participating in the process and inform about the capabilities of the STAs to be sounded.

— Wi-Fi: Twenty-Five Years and Counting (2507.09613 - Geraci et al., 13 Jul 2025) in Section 8.2, MAPC Mechanisms — Coordinated Beamforming (Co‑BF)