QB2 Per traffic identifier (TID) 8.2.4.4 (Sequence CF12:M Yes No N/A    detection Control field), 8.2.4.5 (QoS Control field), 9.3.2.11 (Duplicate detection and recovery(#1606)) QB3 Decode of no-acknowledgment 8.2.4.5.4 (Ack CF12:M Yes No N/A    policy in QoS data frames Policy subfield), 9.19.2.4 (Multiple transmission in an EDCA TXOP), 9.19.2.5 (EDCA backoff procedure), 9.19.4.2 (Contention-based admission control procedures), 9.19.4.3 (Controlled-access admission control) QB4 Acknowledgments (11n) (Block Acks) QB4.1 Immediate Ack 8.3.1.8.1 CF12:O Yes No N/A    (11n) (Overview(11n)), CF16:M 8.3.1.8.2 (Basic BlockAckReq variant(11n)), 8.3.1.9.1 (Overview(11n)), 8.3.1.9.2 (Basic BlockAck variant(11n)), 8.5.5 (Block Ack Action frame details), 9.20 (Block Acknowledgment (Block Ack)) (except 9.20.7 (HT-immediate Block Ack extensions) and 9.20.8 Block Ack extensions)), 10.5 (Block Ack operation)
QB2 Per traffic identifier (TID) detection 8.2.4.4 (Sequence Control field), 8.2.4.5 (QoS Control field), 9.3.2.11 (Duplicate detection and recovery(#1606)) CF12:M Yes  No  N/A  QB3 Decode of no-acknowledgment policy in QoS data frames 8.2.4.5.4 (Ack Policy subfield), 9.19.2.4 (Multiple transmission in an EDCA TXOP), 9.19.2.5 (EDCA backoff procedure), 9.19.4.2 (Contention-based admission control procedures), 9.19.4.3 (Controlled-access admission control) CF12:M Yes  No  N/A  QB4 Acknowledgments (Block Acks) (11n) QB4.1 (11n) Immediate Ack 8.3.1.8.1 (Overview(11n)), 8.3.1.8.2 (Basic BlockAckReq variant(11n)), 8.3.1.9.1 (Overview(11n)), 8.3.1.9.2 (Basic BlockAck variant(11n)), 8.5.5 (Block Ack Action frame details), 9.20 (Block Acknowledgment (Block Ack)) (except 9.20.7 (HT-immediate Block Ack extensions) and 9.20.8 Block Ack extensions)), 10.5 (Block Ack operation) CF12:O CF16:M Yes  No  N/A 