BA Control BA Ctrl
MAC 2 octets Compressed Block Ack unverified
Which variant of Block Ack this is, and which traffic class it covers.
Subfields
- BA Ack Policy — Whether this Block Ack itself needs acknowledging.
- Multi-TID — Set when one frame acknowledges several traffic classes at once.
- Compressed Bitmap — Set for the compressed variant — one bit per MPDU rather than one per fragment.
- TID_INFO — Which traffic class this Block Ack covers. Block Ack agreements are per-TID, so voice and background traffic are acknowledged separately.
Where it sits
Compressed Block Ack MPDU > BA Control
Accuracy
- Clause
- 802.11-2024 §9.3.1.9.2
- Byte order
- little-endian — least significant octet first
- Verified
- Not verified against the standard. Treat this as a claim, not a fact.
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