IEEE 802.11ax-2021

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IEEE Standard for Information Technology–Telecommunications and Information Exchange between Systems Local and Metropolitan Area Networks–Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 1: Enhancements for High-Efficiency WLAN

Published By	Publication Date	Number of Pages
IEEE	2021	767

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Description

Amendment Standard – Active. Modifications to both the IEEE 802.11 physical layer (PHY) and medium access control (MAC) sublayer for high-efficiency operation in frequency bands between 1 GHz and 7.125 GHz are defined in this amendment to IEEE Std 802.11-2020.

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PDF Pages	PDF Title
1	IEEE Std 802.11ax™-2021 Front Cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
11	Introduction
12	Contents
26	Figures
31	Tables
37	1. Overview 1.4 Word usage
38	1.5 Terminology for mathematical, logical, and bit operations 2. Normative references 3. Definitions, acronyms, and abbreviations 3.1 Definitions
39	3.2 Definitions specific to IEEE 802.11
47	3.4 Acronyms and abbreviations
48	4. General description 4.3 Components of the IEEE Std 802.11 architecture 4.3.15a High-efficiency (HE) STA
49	4.3.19 Wireless network management 4.3.19.8 Event reporting
50	6. Layer management 6.3 MLME SAP interface 6.3.3 Scan 6.3.3.2 MLME-SCAN.request 6.3.3.2.2 Semantics of the service primitive
51	6.3.3.3 MLME-SCAN.confirm 6.3.3.3.2 Semantics of the service primitive
54	6.3.4 Synchronization 6.3.4.2 MLME-JOIN.request 6.3.4.2.2 Semantics of the service primitive 6.3.4.2.4 Effect of receipt 6.3.7 Associate 6.3.7.2 MLME-ASSOCIATE.request 6.3.7.2.2 Semantics of the service primitive
55	6.3.7.3 MLME-ASSOCIATE.confirm 6.3.7.3.2 Semantics of the service primitive
57	6.3.7.4 MLME-ASSOCIATE.indication 6.3.7.4.2 Semantics of the service primitive
58	6.3.7.5 MLME-ASSOCIATE.response 6.3.7.5.2 Semantics of the service primitive
60	6.3.8 Reassociate 6.3.8.2 MLME-REASSOCIATE.request 6.3.8.2.2 Semantics of the service primitive
61	6.3.8.3 MLME-REASSOCIATE.confirm 6.3.8.3.2 Semantics of the service primitive
62	6.3.8.4 MLME-REASSOCIATE.indication 6.3.8.4.2 Semantics of the service primitive
63	6.3.8.5 MLME-REASSOCIATE.response 6.3.8.5.2 Semantics of the service primitive
65	6.3.11 Start 6.3.11.2 MLME-START.request 6.3.11.2.2 Semantics of the service primitive
66	6.3.11.2.4 Effect of receipt 6.3.118 Quiet time period 6.3.118.1 Introduction 6.3.118.2 MLME-QTP.request 6.3.118.2.1 Function 6.3.118.2.2 Semantics of the service primitive
67	6.3.118.2.3 When generated 6.3.118.2.4 Effect of receipt 6.3.118.3 MLME-QTP.indicaton 6.3.118.3.1 Function 6.3.118.3.2 Semantics of the service primitive
68	6.3.118.3.3 When generated 6.3.118.3.4 Effect of receipt 6.3.118.4 MLME-QTP.response 6.3.118.4.1 Function 6.3.118.4.2 Semantics of the service primitive
69	6.3.118.4.3 When generated 6.3.118.4.4 Effect of receipt 6.3.118.5 MLME-QTP.confirm 6.3.118.5.1 Function 6.3.118.5.2 Semantics of the service primitive
70	6.3.118.5.3 When generated 6.3.118.5.4 Effect of receipt 6.5 PLME SAP interface 6.5.6 PLME-TXTIME.confirm 6.5.6.2 Semantics of the service primitive
72	8. PHY service specification 8.3 Detailed PHY service specifications 8.3.4 Basic service and options 8.3.4.2 PHY-SAP inter-(sub)layer service primitives 8.3.4.3 PHY SAP service primitives parameters 8.3.4.4 Vector descriptions
73	8.3.5 PHY SAP detailed service specification 8.3.5.2 PHY-DATA.request 8.3.5.2.2 Semantics of the service primitive 8.3.5.3 PHY-DATA.indication 8.3.5.3.2 Semantics of the service primitive
74	8.3.5.10 PHY-CCARESET.request 8.3.5.10.3 When generated 8.3.5.12 PHY-CCA.indication 8.3.5.12.2 Semantics of the service primitive
75	8.3.5.12.3 When generated 8.3.5.16 PHY-TRIGGER.request 8.3.5.16.1 Function 8.3.5.16.2 Semantics of the service primitive
76	8.3.5.16.3 When generated 8.3.5.16.4 Effect of receipt
77	9. Frame formats 9.2 MAC frame formats 9.2.4 Frame fields 9.2.4.1 Frame Control field 9.2.4.1.3 Type and Subtype subfields 9.2.4.1.8 More Data subfield
78	9.2.4.1.10 +HTC subfield 9.2.4.3 Address fields 9.2.4.3.5 DA field 9.2.4.3.6 SA field
79	9.2.4.5 QoS Control field 9.2.4.5.2 TID subfield 9.2.4.5.4 Ack Policy Indicator subfield
80	9.2.4.5.6 Queue Size subfield
81	9.2.4.6 HT Control field 9.2.4.6.1 General
82	9.2.4.6.3 VHT variant
83	9.2.4.6.3a HE variant
84	9.2.4.6a Control subfield variants of an A-Control subfield 9.2.4.6a.1 TRS Control
85	9.2.4.6a.2 OM Control
86	9.2.4.6a.3 HLA Control
89	9.2.4.6a.4 BSR Control
91	9.2.4.6a.5 UPH Control
92	9.2.4.6a.6 BQR Control 9.2.4.6a.7 CAS Control
93	9.2.4.7 Frame Body field 9.2.4.7.1 General
94	9.2.5 Duration/ID field (QoS STA) 9.2.5.2 Setting for single and multiple protection under enhanced distributed channel access (EDCA)
96	9.2.5.7 Setting for control response frames 9.2.5.8 Setting for other response frames 9.3 Format of individual frame types 9.3.1 Control frames 9.3.1.2 RTS frame format
97	9.3.1.3 CTS frame format 9.3.1.5 PS-Poll frame format 9.3.1.5.1 General 9.3.1.6 CF-End frame format 9.3.1.7 BlockAckReq frame format 9.3.1.7.1 Overview
98	9.3.1.8 BlockAck frame format 9.3.1.8.1 Overview
99	9.3.1.8.2 Compressed BlockAck variant
101	9.3.1.8.5 GCR Block Ack variant 9.3.1.8.7 Multi-STA BlockAck variant
105	9.3.1.19 VHT/HE NDP Announcement frame format
108	9.3.1.22 Trigger frame format 9.3.1.22.1 General
116	9.3.1.22.2 Basic Trigger frame format
117	9.3.1.22.3 BFRP Trigger frame format 9.3.1.22.4 MU-BAR Trigger frame format 9.3.1.22.5 MU-RTS Trigger frame format
119	9.3.1.22.6 BSRP Trigger frame format 9.3.1.22.7 GCR MU-BAR Trigger frame format 9.3.1.22.8 BQRP Trigger frame format 9.3.1.22.9 NFRP Trigger frame format
120	9.3.2 Data frames 9.3.2.1 Format of Data frames 9.3.2.1.2 Address and BSSID fields
121	9.3.3 (PV0) Management frames 9.3.3.2 Beacon frame format
123	9.3.3.5 Association Request frame format
124	9.3.3.6 Association Response frame format
125	9.3.3.7 Reassociation Request frame format
126	9.3.3.8 Reassociation Response frame format
127	9.3.3.9 Probe Request frame format
128	9.3.3.10 Probe Response frame format
130	9.3.3.13 Action frame format 9.3.4 Extension frames 9.3.4.2 DMG Beacon 9.3.4.3 S1G Beacon frame format
131	9.4 Management and Extension frame body components 9.4.1 Fields that are not elements 9.4.1.7 Reason Code field 9.4.1.9 Status Code field 9.4.1.11 Action field
132	9.4.1.17 QoS Info field 9.4.1.45 Band ID field
133	9.4.1.53 Operating Mode field
134	9.4.1.60 TWT Information field
135	9.4.1.64 HE MIMO Control field
137	9.4.1.65 HE Compressed Beamforming Report field
144	9.4.1.66 HE MU Exclusive Beamforming Report field
146	9.4.1.67 HE CQI Report field
147	9.4.2 Elements 9.4.2.1 General
148	9.4.2.3 Supported Rates and BSS Membership Selectors element 9.4.2.5 TIM element 9.4.2.5.1 General
149	9.4.2.8 Country element
150	9.4.2.26 Extended Capabilities element
151	9.4.2.28 EDCA Parameter Set element
152	9.4.2.29 TSPEC element
154	9.4.2.36 Neighbor Report element
156	9.4.2.45 Multiple BSSID element
157	Insert NOTE 5 and the following paragraph into 9.4.2.45 after the now eighth paragraph: 9.4.2.63 Channel Switch Timing element
158	9.4.2.66 Event Request element 9.4.2.66.1 Event Request definition 9.4.2.67 Event Report element 9.4.2.67.1 Event Report definition 9.4.2.67.7 BSS color collision event report 9.4.2.67.8 BSS color in use event report
159	9.4.2.73 Multiple BSSID-Index element 9.4.2.139 ADDBA Extension element
160	9.4.2.157 VHT Capabilities element 9.4.2.157.3 Supported VHT-MCS and NSS Set field 9.4.2.159 Extended BSS Load element
161	9.4.2.161 Transmit Power Envelope element
165	9.4.2.170 Reduced Neighbor Report element 9.4.2.170.2 Neighbor AP Information field
168	9.4.2.177 FILS Request Parameters element 9.4.2.199 TWT element Replace Figure 9-686 with the following figure: Change Figure 9-687 as follows: Insert the following paragraphs, Table 9-296a, Figure 9-687a, and Figure 9-687b into 9.4.2.199 after the fifth paragraph (“The Responder PM Mode subfield…”):
170	Change the following block of text (i.e., now 13th through 22nd paragraphs) in 9.4.2.199 as shown (including changing Figure 9-688 and Table 9-297 and inserting Figure 9-688a and Table 9-297a):
174	The block of text from the now 23rd paragraph (“When a TWT responding STA ….”) through the now 30th paragraph (“A non-AP STA uses ….”) (including Figure 9-689 and Table 9-298) remains unchanged.
175	Change the following block of text (i.e., now 31st through 40th paragraphs) in 9.4.2.199 as shown (including inserting Figure 9-689a):
176	9.4.2.248 HE Capabilities element 9.4.2.248.1 General
177	9.4.2.248.2 HE MAC Capabilities Information field
183	9.4.2.248.3 HE PHY Capabilities Information field
194	9.4.2.248.4 Supported HE-MCS And NSS Set field
196	9.4.2.248.5 PPE Thresholds field
198	9.4.2.249 HE Operation element
201	9.4.2.250 UORA Parameter Set element 9.4.2.251 MU EDCA Parameter Set element
202	9.4.2.252 Spatial Reuse Parameter Set element
204	9.4.2.253 NDP Feedback Report Parameter Set element 9.4.2.254 BSS Color Change Announcement element
205	9.4.2.255 Quiet Time Period element 9.4.2.255.1 General
206	9.4.2.255.2 Quiet Time Period Setup subtype 9.4.2.255.3 Quiet Time Period Request subtype
207	9.4.2.255.4 Quiet Time Period Response subtype
208	9.4.2.256 ESS Report element
209	9.4.2.257 OPS element 9.4.2.258 TWT Constraint Parameters element 9.4.2.259 HE BSS Load element
211	9.4.2.260 Multiple BSSID Configuration element 9.4.2.261 Known BSSID element
212	9.4.2.262 Short SSID List element 9.4.2.263 HE 6 GHz Band Capabilities element
213	9.4.2.264 UL MU Power Capabilities element
214	9.6 Action frame format details 9.6.1 Introduction General 9.6.7 Public Action details 9.6.7.16 TDLS Discovery Response frame format 9.6.7.36 FILS Discovery frame format
216	9.6.12 TDLS Action field formats 9.6.12.2 TDLS Setup Request Action field format
217	9.6.12.3 TDLS Setup Response Action field format 9.6.12.4 TDLS Setup Confirm Action field format
218	9.6.15 Self-protected Action frame details 9.6.15.2 Mesh Peering Open frame format 9.6.15.2.2 Mesh Peering Open frame details 9.6.15.3 Mesh Peering Confirm frame format 9.6.15.3.2 Mesh Peering Confirm frame details 9.6.24 Unprotected S1G Action frame details 9.6.24.1 Unprotected S1G Action field
219	9.6.24.8 TWT Setup frame format 9.6.24.9 TWT Teardown frame format
220	9.6.24.12 TWT Information frame format
221	9.6.31 HE Action frame details 9.6.31.1 HE Action field 9.6.31.2 HE Compressed Beamforming/CQI frame format
222	9.6.31.3 Quiet Time Period action frame format 9.6.31.4 OPS frame format 9.6.32 Protected HE Action frame details 9.6.32.1 Protected HE Action field
223	9.6.32.2 HE BSS Color Change Announcement frame format 9.6.32.3 MU EDCA Reset frame format
224	9.7 Aggregate MPDU (A-MPDU) 9.7.1 A-MPDU format
226	9.7.3 A-MPDU contents
228	Table 9-532 remains unchanged.
229	Table 9-534 remains unchanged.
235	10. MAC sublayer functional description 10.1 Introduction 10.2 MAC architecture 10.2.1 General
236	10.2.3 Hybrid coordination function (HCF) 10.2.3.2 HCF contention based channel access (EDCA) 10.2.4a Triggered uplink access (TUA) 10.2.5 Combined use of DCF, and HCF, and TUA
237	10.3 DCF 10.3.1 General 10.3.2 Procedures common to the DCF and EDCAF 10.3.2.1 CS mechanism
238	10.3.2.3 IFS 10.3.2.3.3 SIFS 10.3.2.3.7 EIFS 10.3.2.4 Setting and resetting the NAV
240	10.3.2.6 RTS/CTS with fragmentation 10.3.2.13 MU acknowledgment procedure 10.3.2.13.1 Acknowledgment procedure for DL MU PPDU in SU PPDU
241	10.3.2.13.2 Acknowledgment procedure for DL MU PPDU in MU format 10.3.2.13.3 Acknowledgment procedure for UL MU transmission
243	10.3.3 Random backoff time 10.3.4 DCF access procedure 10.3.4.4 Recovery procedures and retransmit limits 10.3.5 Individually addressed MPDU transfer procedure
244	10.3.7 DCF timing relations 10.3.8 Signal extension 10.4 MSDU, A-MSDU, and MMPDU fragmentation
245	10.5 MSDU, A-MSDU, and MMPDU defragmentation 10.6 Multirate support 10.6.1 Overview 10.6.5 Rate selection for Data and Management frames 10.6.5.1 Rate selection for non-STBC Beacon and non-STBC PSMP frames
246	10.6.5.3 Rate selection for other group addressed Data and Management frames 10.6.6 Rate selection for Control frames 10.6.6.1 General rules for rate selection for Control frames 10.6.6.6 Channel Width selection for Control frames
247	10.6.10 Modulation classes
248	10.6.11 Non-HT basic rate calculation
249	10.6.12 Channel Width in non-HT and non-HT duplicate PPDUs 10.6.13 Rate selection constraints for VHT STAs 10.6.13.3 Additional rate selection constraints for VHT PPDUs
250	10.8 HT Control field operation
252	10.9 Control Wrapper operation 10.11 A-MSDU operation
253	10.12 A-MPDU operation 10.12.1 A-MPDU contents 10.12.2 A-MPDU length limit rules
255	10.12.3 Minimum MPDU Sstart Sspacing field rules 10.12.4 A-MPDU aggregation of group addressed Data frames
257	10.12.6 A-MPDU padding for VHT PPDU, HE, or S1G PPDU 10.12.7 Setting the EOF/Tag field of the MPDU delimiter 10.13 PPDU duration constraint 10.15 Low-density parity check code (LDPC) operation
258	10.22 Operation across regulatory domains 10.22.3 Operation with operating classes
259	10.22.4 Operation with the Transmit Power Envelope element
260	10.23 HCF 10.23.1 General 10.23.2 HCF contention based channel access (EDCA) 10.23.2.2 EDCA backoff procedure
261	10.23.2.4 Obtaining an EDCA TXOP
262	10.23.2.5 EDCA channel access in a VHT, HE, or TVHT BSS
263	10.23.2.7 Sharing an EDCA TXOP
264	10.23.2.8 Multiple frame transmission in an EDCA TXOP
266	10.23.2.9 TXOP limits
268	10.23.2.10 Truncation of TXOP 10.23.2.11 Termination of TXOP 10.23.2.12 Retransmit procedures 10.23.2.12.1 General
269	10.23.3 HCF controlled channel access (HCCA) 10.23.3.5 HCCA transfer rules 10.23.3.5.3 Use of RTS/CTS 10.25 Block acknowledgment (block ack) 10.25.2 Setup and modification of the block ack parameters 10.25.5 Selection of BlockAck and BlockAckReq variants
270	10.25.6 HT-immediate block ack extensions 10.25.6.1 Introduction to HT-immediate block ack extensions
271	10.25.6.3 Scoreboard context control during full-state operation 10.25.6.5 Generation and transmission of BlockAck frames by an HT STA, DMG STA, or S1G STA 10.25.6.6 Receive reordering buffer control operation 10.25.6.6.1 General
272	10.25.8 GCR and GLK-GCR block ack 10.25.8.1 Introduction General 10.25.8.4 GCR block ack BlockAckReq and BlockAck frame exchanges
274	10.27 Protection mechanisms 10.27.6 Protection rules for HE STAs 10.29 Reverse direction protocol 10.29.1 General 10.29.2 Reverse direction (RD) exchange sequence
275	10.29.3 Rules for RD initiator
276	10.29.4 Rules for RD responder
277	10.36 Null data PPDU (NDP) sounding 10.36.6 Transmission of a VHT NDP 10.47 Target wake time (TWT) 10.47.1 TWT overview
281	10.47.9 TWT parameter ranges
282	11. MLME 11.1 Synchronization 11.1.3 Maintaining synchronization 11.1.3.8 Multiple BSSID procedure 11.1.3.8.1 General
283	11.1.3.8.2 Nontransmitted BSSID profile
284	11.1.3.8.3 Discovery of a nontransmitted BSSID profile
285	11.1.3.8.4 Inheritance of element values
286	11.1.3.8.5 Traffic advertisement in a multiple BSSID set
287	11.1.4 Acquiring synchronization, scanning 11.1.4.3 Active scanning and probing procedures 11.1.4.3.2 Active scanning procedure for a non-DMG STA 11.1.4.3.4 Criteria for sending a response
288	11.1.4.3.11 Enhanced FILS active scanning to preferred AP 11.2 Power management 11.2.3 Power management in a non-DMG infrastructure network 11.2.3.2 Non-AP STA power management modes
289	11.2.3.6 AP operation
290	11.2.3.7 Receive operation for STAs in PS mode
291	11.2.3.9 STAs operating in active mode 11.2.3.15 TIM Broadcast
292	11.2.6 SM power save
294	11.3 STA authentication and association 11.3.3 Frame filtering based on STA state 11.3.5 Association, reassociation, and disassociation 11.3.5.3 AP or PCP association receipt procedures 11.3.5.5 AP or PCP reassociation receipt procedures 11.3.8 Neighbor report information upon rejection with suggested BSS transition
295	11.4 TS operation 11.4.4 TS setup 11.4.4.4 TS setup procedures for both AP and non-AP STA initiation 11.7 TPC procedures 11.7.1 General 11.7.2 Association based on transmit power capability 11.7.3 Peering based on transmit power capability
296	11.7.5 Specification of regulatory and local maximum transmit power levels
298	11.7.6 Transmit power selection 11.10 Radio measurement procedures 11.10.14 Multiple BSSID set
299	11.20 Tunneled direct-link setup 11.20.1 General 11.21 Wireless network management procedures 11.21.2 Event request and report procedures 11.21.2.1 Event request and event report 11.21.2.7 BSS color collision event
300	11.21.2.8 BSS color in use event 11.21.6 Fine timing measurement (FTM) procedure 11.21.6.4 Measurement exchange 11.21.7 BSS transition management for network load balancing 11.21.7.1 BSS transition capability 11.21.7.4 BSS transition management response
301	11.21.7.5 Planned ESS 11.31 Multi-band operation 11.31.5 On-channel Tunneling (OCT) operation
302	11.45 Fast Initial Link Setup (FILS) procedures 11.45.2 FILS Discovery frame generation and usage 11.45.2.1 FILS Discovery frame transmission
303	11.49 Reduced neighbor report
305	11.53 Out-of-band discovery of a 6 GHz BSS
308	12. Security 12.5 RSNA confidentiality and integrity protocols 12.5.3 CTR with CBC-MAC protocol (CCMP) 12.5.3.3 CCMP cryptographic encapsulation 12.5.3.3.2 PN processing 12.5.5 GCM protocol (GCMP) 12.5.5.3 GCMP cryptographic encapsulation 12.5.5.3.2 PN processing 12.12 Constraints on allowed security parameters 12.12.1 Introduction 12.12.2 Security constraints in the 6 GHz band
310	14. MLME mesh procedures 14.2 Mesh discovery 14.2.4 Mesh STA configuration 14.2.7 Candidate peer mesh STA
311	18. Extended Rate PHY (ERP) specification 18.2 PHY-specific service parameter list
312	26. High-efficiency (HE) MAC specification 26.1 Introduction 26.2 HE channel access 26.2.1 TXOP duration-based RTS/CTS
313	26.2.2 Intra-BSS and inter-BSS PPDU classification
314	26.2.3 SRG PPDU identification
315	26.2.4 Updating two NAVs
316	26.2.5 Truncation of TXOP
317	26.2.6 MU-RTS Trigger/CTS frame exchange procedure 26.2.6.1 General
318	26.2.6.2 MU-RTS Trigger frame transmission
319	26.2.6.3 CTS frame response to an MU-RTS Trigger frame
320	26.2.7 EDCA operation using MU EDCA parameters
322	26.2.8 Multiple frame transmission in an EDCA TXOP in the 6 GHz band 26.3 Fragmentation and defragmentation 26.3.1 General
324	26.3.2 Dynamic fragmentation 26.3.2.1 General
325	26.3.2.2 Level 1 dynamic fragmentation 26.3.2.3 Level 2 dynamic fragmentation 26.3.2.4 Level 3 dynamic fragmentation
326	26.3.3 Dynamic defragmentation 26.3.3.1 General
327	26.3.3.2 Level 1 dynamic defragmentation 26.3.3.3 Level 2 dynamic defragmentation
328	26.3.3.4 Level 3 dynamic defragmentation
329	26.4 HE acknowledgment procedure 26.4.1 Overview
331	26.4.2 Acknowledgment context in a Multi-STA BlockAck frame
333	26.4.3 Negotiation of block ack bitmap lengths
334	26.4.4 Per-PPDU acknowledgment selection rules 26.4.4.1 General 26.4.4.2 Responding to an HE SU PPDU or HE ER SU PPDU with an SU PPDU
335	26.4.4.3 Responding to an HE MU PPDU with an SU PPDU 26.4.4.4 Responding to an HE MU PPDU, HE SU PPDU, or HE ER SU PPDU with an HE TB PPDU
336	26.4.4.5 Responding to an HE TB PPDU with an SU PPDU
337	26.4.4.6 Responding to an HE TB PPDU with an HE MU PPDU
338	26.4.5 HE block acknowledgment request and response rules
339	26.5 MU operation 26.5.1 HE DL MU operation 26.5.1.1 General 26.5.1.2 RU addressing in an HE MU PPDU
341	26.5.1.3 RU allocation in an HE MU PPDU
342	26.5.2 UL MU operation 26.5.2.1 General 26.5.2.2 Rules for soliciting UL MU frames 26.5.2.2.1 General
344	26.5.2.2.2 Requirements for allocating resources
345	26.5.2.2.3 Padding for a triggering frame
346	26.5.2.2.4 Allowed settings of the Trigger frame fields and TRS Control subfield
349	26.5.2.2.5 AP access procedures for UL MU operation
350	26.5.2.3 Non-AP STA behavior for UL MU operation 26.5.2.3.1 General
351	26.5.2.3.2 Conditions for not responding with an HE TB PPDU 26.5.2.3.3 TXVECTOR parameters for HE TB PPDU response to Trigger frame
353	26.5.2.3.4 TXVECTOR parameters for HE TB PPDU response to TRS Control subfield
354	26.5.2.3.5 RA field for frames carried in an HE TB PPDU 26.5.2.4 A-MPDU contents in an HE TB PPDU
357	26.5.2.5 UL MU CS mechanism
358	26.5.3 MU cascading sequence
359	26.5.4 UL OFDMA-based random access (UORA) 26.5.4.1 General
360	26.5.4.2 Eligible RA-RUs
361	26.5.4.3 Transmission procedure for UORA
363	26.5.4.4 Retransmission procedure for UORA 26.5.4.5 Additional considerations for unassociated STAs
364	26.5.5 Buffer status report operation
366	26.5.6 Bandwidth query report operation
367	26.5.7 NDP feedback report procedure 26.5.7.1 General 26.5.7.2 STA behavior
369	26.5.7.3 AP behavior 26.5.7.4 NDP feedback report for a resource request
370	26.5.7.5 Power save operation with NDP feedback report procedure 26.5.8 Use of TSPEC by HE STAs 26.5.9 UL MU transmit power capabilities 26.6 A-MPDU operation in an HE PPDU 26.6.1 General
372	26.6.2 A-MPDU padding in an HE PPDU 26.6.2.1 General 26.6.2.2 A-MPDU padding in an HE SU PPDU, HE ER SU PPDU, and HE MU PPDU 26.6.2.3 A-MPDU padding in an HE TB PPDU
373	26.6.3 Multi-TID A-MPDU and ack-enabled single-TID A-MPDU 26.6.3.1 General
375	26.6.3.2 Ack-enabled single-TID A-MPDU operation 26.6.3.3 Non-ack-enabled multi-TID A-MPDU operation 26.6.3.4 Ack-enabled multi-TID A-MPDU operation
376	26.7 HE sounding protocol 26.7.1 General 26.7.2 HE sounding protocol
379	26.7.3 Rules for HE sounding protocol sequences
385	26.7.4 Rules for generating segmented feedback
386	26.7.5 HE sounding NDP transmission 26.8 TWT operation 26.8.1 General
387	26.8.2 Individual TWT agreements
391	26.8.3 Broadcast TWT operation 26.8.3.1 General
393	26.8.3.2 Rules for TWT scheduling AP
397	26.8.3.3 Rules for TWT scheduled STA
401	26.8.4 Use of TWT Information frames 26.8.4.1 General
402	26.8.4.2 TWT Information frame exchange for individual TWT
403	26.8.4.3 TWT Information frame exchange for broadcast TWT
404	26.8.4.4 TWT Information frame exchange for flexible wake time
405	26.8.5 Power save operation during TWT SPs
406	26.8.6 Negotiation of wake TBTT and wake interval
408	26.8.7 HE subchannel selective transmission 26.8.7.1 General 26.8.7.2 SST operation
409	26.9 Operating mode indication 26.9.1 General
412	26.9.2 Receive operating mode (ROM) indication
413	26.9.3 Transmit operating mode (TOM) indication
414	26.10 Spatial reuse operation 26.10.1 General
415	26.10.2 OBSS PD-based spatial reuse operation 26.10.2.1 General 26.10.2.2 General operation with non-SRG OBSS PD level
417	26.10.2.3 General operation with SRG OBSS PD level
418	26.10.2.4 Adjustment of OBSS PD and transmit power
421	26.10.2.5 OBSS PD SR transmit power restriction period
422	26.10.2.6 OBSS PD-based spatial reuse backoff procedure
423	26.10.3 PSR-based spatial reuse operation 26.10.3.1 General 26.10.3.2 PSR-based spatial reuse initiation
424	26.10.3.3 PSR-based spatial reuse backoff procedure 26.10.3.4 UL Spatial Reuse subfield of Trigger frame
425	26.10.3.5 PSRT PPDU transmission requirements 26.10.3.6 PSRT PPDU reception and response transmission requirements 26.10.4 Interaction of OBSS PD and PSR-based spatial reuse
426	26.11 Rules for setting some TXVECTOR parameters for PPDUs transmitted by an HE STA 26.11.1 STA_ID
427	26.11.2 UPLINK_FLAG 26.11.3 BEAM_CHANGE 26.11.4 BSS_COLOR
428	26.11.5 TXOP_DURATION
429	26.11.6 SPATIAL_REUSE
431	26.11.7 INACTIVE_SUBCHANNELS and RU_ALLOCATION
432	26.11.8 TRIGGER_RESPONDING 26.11.9 STBC and DCM
433	26.12 HE PPDU post-FEC padding and packet extension
434	26.13 Link adaptation using the HLA Control subfield
436	26.14 Power management 26.14.1 Intra-PPDU power save for non-AP HE STAs
437	26.14.2 Power save with UORA and TWT
438	26.14.3 Opportunistic power save 26.14.3.1 General 26.14.3.2 AP operation for opportunistic power save
439	26.14.3.3 STA operation for opportunistic power save 26.14.4 HE dynamic SM power save
440	26.15 PPDU format, BW, MCS, NSS, and DCM selection rules 26.15.1 General 26.15.2 PPDU format selection
442	26.15.3 MCS, NSS, BW, and DCM selection
444	26.15.4 Rate selection constraints for HE STAs 26.15.4.1 Receive HE-MCS and NSS Set
445	26.15.4.2 Transmit HE-MCS and NSS Set 26.15.4.3 Additional rate selection constraints for HE PPDUs
446	26.15.4.4 Rx Supported VHT-MCS and NSS Set 26.15.5 Additional rules for ER beacons and group addressed frames 26.15.6 Additional rules for HE beacons and group addressed frames
447	26.15.7 Additional rules for group addressed frames in an HE MU PPDU
448	26.15.8 Additional rules for PPDUs sent in the 6 GHz band
449	26.16 Midamble parameter setting rules
450	26.17 HE BSS operation 26.17.1 Basic HE BSS operation
453	26.17.2 HE BSS operation in the 6 GHz band 26.17.2.1 General
455	26.17.2.2 Beacons in the 6 GHz band
456	26.17.2.3 Scanning in the 6 GHz band 26.17.2.3.1 General 26.17.2.3.2 AP behavior for fast passive scanning
457	26.17.2.3.3 Non-AP STA scanning behavior
459	26.17.2.4 HE STA antenna indication 26.17.3 BSS color 26.17.3.1 General 26.17.3.2 Initial BSS color 26.17.3.3 Disabling BSS color
460	26.17.3.4 Selecting and advertising a new BSS color
461	26.17.3.5 Detecting and reporting BSS color collision 26.17.3.5.1 General 26.17.3.5.2 Autonomous reporting of BSS color collision
462	26.17.4 AID assignment 26.17.5 Quiet HE STAs in an HE BSS 26.17.5.1 General
463	26.17.5.2 QTP Requesting STA procedure
464	26.17.5.3 Responding AP procedure 26.17.6 ER beacon generation in an ER BSS
465	26.17.7 Co-hosted BSSID set
466	27. High-efficiency (HE) PHY specification 27.1 Introduction 27.1.1 Introduction to the HE PHY
471	27.1.2 Scope 27.1.3 HE PHY functions 27.1.3.1 General 27.1.3.2 PHY management entity (PLME) 27.1.3.3 Service specification method 27.1.4 PPDU formats
472	27.2 HE PHY service interface 27.2.1 Introduction 27.2.2 TXVECTOR and RXVECTOR parameters
489	27.2.3 TRIGVECTOR parameters
490	27.2.4 PHYCONFIG_VECTOR parameters
491	27.2.5 Effects of CH_BANDWIDTH parameter on PPDU format
494	27.2.6 Support for non-HT, HT, and VHT formats 27.2.6.1 General
495	27.2.6.2 Support for non-HT format
497	27.2.6.3 Support for HT format 27.2.6.4 Support for VHT format 27.3 HE PHY 27.3.1 Introduction
498	27.3.1.1 MU transmission 27.3.1.2 OFDMA
499	27.3.2 Subcarrier and resource allocation 27.3.2.1 General 27.3.2.2 Resource unit, guard, and DC subcarriers
505	27.3.2.3 Null subcarriers
506	27.3.2.4 Pilot subcarriers 27.3.2.5 Resource indication and User identification in an HE MU PPDU
507	27.3.2.6 Resource allocation for an HE TB PPDU 27.3.2.7 20 MHz operating non-AP HE STAs
508	27.3.2.8 RU restrictions for 20 MHz operation
509	27.3.2.9 80 MHz operating non-AP HE STAs 27.3.3 MU-MIMO 27.3.3.1 DL MU-MIMO 27.3.3.1.1 Supported RU sizes in DL MU-MIMO 27.3.3.1.2 Maximum number of spatial streams in an HE MU PPDU
510	27.3.3.2 UL MU-MIMO 27.3.3.2.1 Introduction 27.3.3.2.2 Supported RU sizes in UL MU-MIMO 27.3.3.2.3 MU-MIMO HE-LTF mode
511	27.3.3.2.4 Maximum number of spatial streams in UL MU-MIMO 27.3.4 HE PPDU formats
514	27.3.5 Transmitter block diagram
522	27.3.6 Overview of the PPDU encoding process 27.3.6.1 General 27.3.6.2 Construction of L-STF field
523	27.3.6.3 Construction of L-LTF field 27.3.6.4 Construction of L-SIG field
524	27.3.6.5 Construction of RL-SIG field 27.3.6.6 Construction of HE-SIG-A field
526	27.3.6.7 Construction of HE-SIG-B field 27.3.6.8 Construction of HE-STF field 27.3.6.9 Construction of HE-LTF field
527	27.3.6.10 Construction of the Data field in an HE SU PPDU, HE ER SU PPDU, and HE TB PPDU 27.3.6.10.1 Using BCC 27.3.6.10.2 Using LDPC
528	27.3.6.11 Construction of the Data field in an HE MU PPDU 27.3.6.11.1 General 27.3.6.11.2 Using BCC 27.3.6.11.3 Using LDPC
529	27.3.6.11.4 Combining to form an HE MU PPDU 27.3.7 HE modulation and coding schemes (HE-MCSs) 27.3.8 HE-SIG-B modulation and coding schemes (HE-SIG-B-MCSs) 27.3.9 Timing-related parameters
534	27.3.10 Mathematical description of signals
540	27.3.11 HE preamble 27.3.11.1 Introduction 27.3.11.2 Cyclic shift 27.3.11.2.1 Cyclic shift for pre-HE modulated fields 27.3.11.2.2 Cyclic shift for HE modulated fields
541	27.3.11.3 L-STF field
542	27.3.11.4 L-LTF field
543	27.3.11.5 L-SIG field
545	27.3.11.6 RL-SIG field
546	27.3.11.7 HE-SIG-A field 27.3.11.7.1 General 27.3.11.7.2 Content
557	27.3.11.7.3 CRC computation
558	27.3.11.7.4 Encoding and modulation
560	27.3.11.8 HE-SIG-B field 27.3.11.8.1 General 27.3.11.8.2 HE-SIG-B content channels
561	27.3.11.8.3 Common field
567	27.3.11.8.4 User Specific field
573	27.3.11.8.5 Encoding and modulation
576	27.3.11.9 HE-STF field
580	27.3.11.10 HE-LTF field
595	27.3.12 Data field 27.3.12.1 General
596	27.3.12.2 Pre-FEC padding process
598	27.3.12.3 SERVICE field 27.3.12.4 Scrambler
599	27.3.12.5 Coding 27.3.12.5.1 BCC coding and puncturing
600	27.3.12.5.2 LDPC coding
601	27.3.12.5.3 Post-FEC padding 27.3.12.5.4 Encoding process for an HE MU PPDU
603	27.3.12.5.5 Encoding process for an HE TB PPDU
604	27.3.12.6 Stream parser
605	27.3.12.7 Segment parser 27.3.12.8 BCC interleavers
606	27.3.12.9 Constellation mapping
609	27.3.12.10 LDPC tone mapper
611	27.3.12.11 Segment deparser
612	27.3.12.12 Space-time block coding 27.3.12.13 Pilot subcarriers
617	27.3.12.14 OFDM modulation
618	27.3.12.15 Dual carrier modulation 27.3.12.16 Midambles
620	27.3.13 Packet extension
624	27.3.14 Non-HT duplicate transmission
625	27.3.15 Transmit requirements for PPDUs sent in response to a triggering frame 27.3.15.1 Introduction 27.3.15.2 Power pre-correction
626	27.3.15.3 Pre-correction accuracy requirements
628	27.3.16 SU-MIMO and DL MU-MIMO beamforming 27.3.16.1 General 27.3.16.2 Beamforming feedback matrix V
629	27.3.16.3 CQI feedback 27.3.17 HE sounding NDP
630	27.3.18 HE TB feedback NDP 27.3.19 Transmit specification 27.3.19.1 Transmit spectral mask
635	27.3.19.2 Spectral flatness
636	27.3.19.3 Transmit center frequency and symbol clock frequency tolerance 27.3.19.4 Modulation accuracy 27.3.19.4.1 Introduction to modulation accuracy tests
637	27.3.19.4.2 Transmit center frequency leakage 27.3.19.4.3 Transmitter constellation error
638	27.3.19.4.4 Transmitter modulation accuracy (EVM) test
643	27.3.20 Receiver specification 27.3.20.1 General 27.3.20.2 Receiver minimum input sensitivity
644	27.3.20.3 Adjacent channel rejection
645	27.3.20.4 Nonadjacent channel rejection 27.3.20.5 Receiver maximum input level 27.3.20.6 CCA sensitivity 27.3.20.6.1 General 27.3.20.6.2 CCA sensitivity for operating classes requiring CCA-ED
646	27.3.20.6.3 CCA sensitivity for the primary 20 MHz channel
647	27.3.20.6.4 CCA sensitivity for signals not occupying the primary 20 MHz channel
648	27.3.20.6.5 Per 20 MHz CCA sensitivity 27.3.21 HE transmit procedure
653	27.3.22 HE receive procedure
659	27.3.23 Channel numbering 27.3.23.1 General
660	27.3.23.2 Channel allocation in the 6 GHz band 27.3.24 Regulatory requirements 27.4 HE PLME 27.4.1 PLME_SAP sublayer management primitives
665	27.4.2 PHY MIB 27.4.3 TXTIME and PSDU_LENGTH calculation
669	27.4.4 HE PHY
670	27.5 Parameters for HE-MCSs 27.5.1 General 27.5.2 HE-MCSs for 26-tone RU
675	27.5.3 HE-MCSs for 52-tone RU
680	27.5.4 HE-MCSs for 106-tone RU
685	27.5.5 HE-MCSs for 242-tone RU
690	27.5.6 HE-MCSs for 484-tone RU
695	27.5.7 HE-MCSs for 996-tone RU
700	27.5.8 HE-MCSs for 2×996-tone RU
705	27.6 Parameters for HE-SIG-B-MCSs
706	Annex B (normative) Protocol Implementation Conformace Statement (PICS) proforma B.4 PICS proforma—IEEE Std 802.11-2020 B.4.3 IUT configuration
707	B.4.4 MAC protocol B.4.4.1 MAC protocol capabilities B.4.4.2 MAC frames
708	B.4.12 QoS base functionality B.4.33 High-efficiency (HE) features B.4.33.1 HE MAC features
710	B.4.33.2 HE PHY features
716	Annex C (normative) ASN.1 encoding of the MAC and PHY MIB C.3 MIB detail
751	Annex D (normative) Regulatory references D.1 External regulatory references
752	Annex E (normative) Country elements and operating classes E.1 Country information and operating classes
754	E.2 Band-specific operating requirements E.2.7 6 GHz band in the United States
756	Annex G (normative) Frame exchange sequences G.1 General G.4 HT, VHT, and S1G sequences G.5 HE sequences
758	Annex T (informative) Overlapping BSS (OSSS) management T.1 Introduction T.6 BSS color and spatial reuse
759	Annex Z (informative) HE-SIG-B content examples Z.1 General Z.2 Example 1
761	Z.3 Example 2
762	Z.4 Example 3
763	Z.5 Example 4
764	Annex AA (informative) Multiple BSSID configuration examples AA.1 Introduction AA.2 Examples
767	Back Cover

Additional information

Standard Title	IEEE Standard for Information Technology–Telecommunications and Information Exchange between Systems Local and Metropolitan Area Networks–Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 1: Enhancements for High-Efficiency WLAN
Published Code	IEEE
Publication Date	2021
Pages Count	767

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