The context and the presence of each optional subfields in a Per STA Info subfield in a Multi-STA BlockAck frame is as defined in Table 9-24b (Context of the Per STA Info subfield and presence of optional subfields). Table 9-24b—Context of the Per STA Info subfield and presence of optional subfield Ack TID Presence of optional subfields in Context of a Per STA Info field in a Type subfield the Per STA Info field MultiSTA BlockAck frame subfield value value 0 0-7 Block Ack Starting Present Block acknowledgment context: Sent Sequence Control as a response to an A-MPDU that solicits an immediate block Block Ack Bitmap Present acknowledgement or to a BAR frame 1 0-7 Block Ack Starting Not Acknowledgment context: Sent as a Sequence Control present response to an MPDU or VHT Single MPDU that solicits an immediate Block Ack Bitmap Not acknowledgment present 0 or 1 8 to 13 N/A N/A Reserved 0 14 N/A N/A Reserved 1 14 Block Ack Starting Not All acknowledgment context: Sequence Control present Sent as a response to an A-MPDU that solicits an immediate response and all Block Ack Bitmap Not MPDUs contained in the A-MPDU are present received successfully 0 15 1 15 Block Ack Starting Not Action Ack acknowledgment Sequence Control present context: Sent as a response to an Action Ack frame carried in an N/A Not MPDU that solicits an immediate present acknowledgment
The context and the presence of each optional subfields in a Per STA Info subfield in a Multi-STA BlockAck frame is as defined in Table 9-24b (Context of the Per STA Info subfield and presence of optional subfields). Table 9-24b—Context of the Per STA Info subfield and presence of optional subfield Ack Type subfield value TID subfield value Presence of optional subfields in the Per STA Info field Context of a Per STA Info field in a MultiSTA BlockAck frame 0 0-7 Block Ack Starting Sequence Control Present Block acknowledgment context: Sent as a response to an A-MPDU that solicits an immediate block acknowledgement or to a BAR frame Block Ack Bitmap Present 1 0-7 Block Ack Starting Sequence Control Not present Acknowledgment context: Sent as a response to an MPDU or VHT Single MPDU that solicits an immediate acknowledgment Block Ack Bitmap Not present 0 or 1 8 to 13 N/A N/A Reserved 0 14 N/A N/A Reserved 1 14 Block Ack Starting Sequence Control Not present All acknowledgment context: Sent as a response to an A-MPDU that solicits an immediate response and all MPDUs contained in the A-MPDU are received successfully Block Ack Bitmap Not present 0 15 1 15 Block Ack Starting Sequence Control Not present Action Ack acknowledgment context: Sent as a response to an Action Ack frame carried in an that solicits an immediate acknowledgment N/A Not present MPDU