BA Variants
- Normal Block Ack
- Compressed Block Ack
- It is an enhanced version of BA defined in 802.11n. In compressed BA, Fragmented MSDUs cannot be transmitted and hence the bitmap size is reduced from 1024 (64*16) bits to 64 (64*1) bits.
- Multi TID Block Ack
- This scheme is applicable only with power save operation. Previously described BA variants are capable of acknowledging a single TID (traffic identifier).
The confirmation from the recipient station, stating which frames have been received, this is explicitly mentioned in a matrix (part of the BAR) call the "bit map".
Read more about this topic: Block Acknowledgement
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