Compressed Bitmap

Set for the compressed variant — one bit per MPDU rather than one per fragment.

Reading a capture

This bit is what makes the bitmap 8 octets instead of 128. Read it before the bitmap, because it decides how to read the bitmap.

Where it sits

Compressed Block Ack MPDU > BA Control > Compressed Bitmap

• Open in the explorer — Compressed Block Ack

Accuracy

Clause

802.11-2024 §9.3.1.9.2

Verified

Not verified against the standard. Treat this as a claim, not a fact.