802.11be Draft 2.0：超高速无线局域网标准详解
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收藏 9.39MB PDF 举报 802.11be Draft 2.0 是IEEE针对无线局域网（Wireless Local Area Networks, WLAN）标准的最新修订草案，发布于2022年5月，旨在增强极高吞吐量（Extremely High Throughput, EHT）的能力，是IEEE 802.11-2020标准的后续扩展，包括对IEEE 802.11ax、802.11ay、802.11az（D4.0）、802.11ba、802.11bb（D0.7）、802.11bc（D2.0）、以及802.11bd（D2.1）的补充。这份标准草案主要关注本地和城市区域网络（Local and Metropolitan Area Networks, LMAN）中的MAC（Media Access Control）和PHY（Physical Layer）规范的升级，目标是在高密度环境中提供更快的数据传输速度和更好的网络性能。
802.11be 的核心目的是通过引入新的技术特性，如多载波聚合、更高的调制解调器阶数、改进的MIMO（Multiple Input Multiple Output）技术以及更高的频率带宽利用，来提升无线连接的效率。它旨在满足物联网、高清视频会议、虚拟现实（VR）和增强现实（AR）等应用对高速无线通信的需求，尤其是在拥挤的热点区域或大规模连接设备的场景下。
该草案的准备单位是IEEE计算机学会LAN/MAN标准委员会的802.11工作小组，强调了版权保护并声明所有内容未经正式批准，可能随时进行修改。这份标准的制定将推动WLAN技术的进步，为未来的无线通信系统奠定基础，助力数字化时代的快速发展。
802.11be D2.0标准的实施将带来显著的性能提升，包括但不限于更高的数据速率、更低的延迟和更大的连接密度，这对于构建下一代智能城市、云计算服务和工业自动化网络至关重要。然而，实际部署时，还需要配合其他技术进步，如射频硬件的更新和网络优化策略，以确保新标准的效益最大化。随着标准的进一步完善和设备兼容性的提升，我们期待看到802.11be在未来的无线通信市场中发挥关键作用。
IEEE P802.11be/D2.0, May 2022
16 Copyright © 2022 IEEE. All rights reserved.
This is an unapproved IEEE Standards Draft, subject to change.
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10.15Low-density parity check code (LDPC) operation ................................................................. 297
10.23HCF......................................................................................................................................... 297
10.23.2HCF contention based channel access (EDCA) .......................................................... 297
10.23.2.2 EDCA backoff procedure ............................................................................ 297
10.23.2.5 EDCA channel access in a VHT, HE, EHT or TVHT BSS......................... 298
10.23.2.8 Multiple frame transmission in an EDCA TXOP ........................................ 299
10.23.2.9 TXOP limits................................................................................................. 299
10.25Block acknowledgment (block ack) ....................................................................................... 300
10.25.7Protected block ack agreement .................................................................................... 300
10.28MAC frame processing........................................................................................................... 300
10.28.5Operation of the Dialog Token field............................................................................ 300
10.29Reverse direction protocol ...................................................................................................... 300
10.29.4Rules for RD responder ............................................................................................... 300
11. MLME ............................................................................................................................................. 303
11.1 Synchronization ....................................................................................................................... 303
11.1.4 Acquiring synchronization, scanning .......................................................................... 303
11.1.4.3 Active scanning and probing procedures..................................................... 303
11.1.4.3.4Criteria for sending a response .................................................... 303
11.2 Power management.................................................................................................................. 303
11.2.2 Bufferable MMPDUs................................................................................................... 303
11.2.3 Power management in a non-DMG infrastructure network......................................... 303
11.2.3.1 General......................................................................................................... 303
11.2.3.6 AP operation ................................................................................................ 304
11.2.3.7 Receive operation for STAs in PS mode ..................................................... 304
11.2.3.9 STAs operating in active mode.................................................................... 304
11.2.3.10 AP and AP MLD aging function ................................................................. 305
11.2.3.15 TIM Broadcast ............................................................................................. 305
11.2.3.16 WNM sleep mode ........................................................................................ 306
11.2.3.16.1WNM sleep mode capability ..................................................... 306
11.2.3.16.2WNM sleep mode non-AP STA operation ................................ 306
11.2.3.16.3WNM sleep mode AP operation................................................ 306
11.3 STA authenticationAuthentication and association................................................................. 307
11.3.1 General......................................................................................................................... 307
11.3.2 State variables .............................................................................................................. 307
11.3.3 State transition diagram for nonmesh STAs or MLDs ................................................ 307
11.3.4 Frame filtering based on STA or MLD state ............................................................... 309
11.3.5 Authentication and deauthentication ........................................................................... 310
11.3.5.1 General......................................................................................................... 310
11.3.5.2 Authentication—originating STA or MLD ................................................. 310
11.3.5.3 Authentication—destination STA or MLD ................................................. 311
11.3.5.4 Deauthentication—originating STA or MLD.............................................. 312
11.3.5.5 Deauthentication—destination STA or MLD.............................................. 312
11.3.6 Association, reassociation, and disassociation ............................................................ 313
11.3.6.1 General......................................................................................................... 313
11.3.6.2 Non-AP STA, non-AP MLD, and non-PCP STA association initiation proce-
dures 314
11.3.6.3 AP, AP MLD, or PCP association receipt procedures................................. 315
11.3.6.4 Non-AP, non-AP MLD, and non-PCP STA reassociation initiation procedures
318
11.3.6.5 AP, AP MLD, or PCP reassociation receipt procedures.............................. 321
11.3.6.6 Non-AP, non-AP MLD, and non-PCP STA disassociation initiation proce-
dures 324
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