2021版802.11ax无线局域网标准发布：高效WLAN增强技术详解
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收藏 5.26MB PDF 举报 802.11ax协议标准2021版，正式名称为IEEE Std 802.11ax™-2021，是针对IEEE 802.11标准的增强版，特别关注于提高无线局域网（Wireless LAN）的高效率。该标准由IEEE计算机协会的局域网/城域网标准化委员会（LAN/MAN Standards Committee）负责开发，并在2021年2月9日获得IEEE标准化董事会的批准。这份标准更新主要针对802.11ac协议之后，旨在优化Wi-Fi网络在拥挤的无线环境中，如智能家居、物联网(IoT)设备、视频流和数据中心等场景下的性能。
802.11ax标准的核心目标包括但不限于以下几个方面：
1. **高效多址技术**：引入了 Orthogonal Frequency-Division Multiple Access (OFDMA) 和 Multi-User Multiple-Input Multiple-Output (MU-MIMO)，这允许同时服务于多个设备，显著提升了频谱利用率，提高了数据传输速率。
2. **增强的信道绑定**：通过将多个频率带宽捆绑在一起，创建更宽的通道，进一步增加可用的带宽，支持更高的数据吞吐量。
3. **更快的帧结构**：采用短格式的帧结构，使得低延迟的交互成为可能，这对于实时应用如在线游戏和视频会议至关重要。
4. **动态信道选择**：能智能地选择最合适的信道进行通信，减少干扰，提升网络稳定性。
5. **改进的功率效率**：通过优化调制编码技术和电源管理策略，即使在低信号强度下也能提供更好的性能。
6. **更高的密度部署**：设计用于支持密集型环境，如公共区域Wi-Fi热点，能更好地处理大量设备的连接需求。
这份2021版标准的下载限制规定，只能由中国电子科技大学授权使用，且需遵守特定的使用条款，意味着它不是公共领域资料，用户在使用时应遵循相关规定。
802.11ax协议标准的发布是Wi-Fi技术的重要里程碑，它将推动新一代无线网络向更高的数据速率、更低的延迟和更大的连接密度发展，为未来智能家居、企业网络和移动通信等领域带来革命性的变化。对于任何从事无线通信或网络工程的专业人士，理解和掌握802.11ax标准是保持竞争力的关键。
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Copyright © 2021 IEEE. All rights reserved.
10.6.5 Rate selection for Data and Management frames ...................................................... 244
10.6.5.1 Rate selection for non-STBC Beacon and non-STBC PSMP frames...... 244
10.6.5.3 Rate selection for other group addressed Data and Management frames 245
10.6.6 Rate selection for Control frames .............................................................................. 245
10.6.6.1 General rules for rate selection for Control frames ................................. 245
10.6.6.6 Channel Width selection for Control frames ........................................... 245
10.6.10 Modulation classes..................................................................................................... 246
10.6.11 Non-HT basic rate calculation ................................................................................... 247
10.6.12 Channel Width in non-HT and non-HT duplicate PPDUs ........................................ 248
10.6.13 Rate selection constraints for VHT STAs.................................................................. 248
10.6.13.3 Additional rate selection constraints for VHT PPDUs ............................ 248
10.8 HT Control field operation ...................................................................................................... 249
10.9 Control Wrapper operation ...................................................................................................... 251
10.11 A-MSDU operation.................................................................................................................. 251
10.12 A-MPDU operation.................................................................................................................. 252
10.12.1 A-MPDU contents ..................................................................................................... 252
10.12.2 A-MPDU length limit rules ....................................................................................... 252
10.12.3 Minimum MPDU Sstart Sspacing field rules ............................................................ 254
10.12.4 A-MPDU aggregation of group addressed Data frames ............................................ 254
10.12.6 A-MPDU padding for VHT PPDU, HE, or S1G PPDU............................................ 256
10.12.7 Setting the EOF/Tag field of the MPDU delimiter.................................................... 256
10.13 PPDU duration constraint ........................................................................................................ 256
10.15 Low-density parity check code (LDPC) operation .................................................................. 256
10.22 Operation across regulatory domains ...................................................................................... 257
10.22.3 Operation with operating classes ............................................................................... 257
10.22.4 Operation with the Transmit Power Envelope element ............................................. 258
10.23 HCF.......................................................................................................................................... 259
10.23.1 General....................................................................................................................... 259
10.23.2 HCF contention based channel access (EDCA) ........................................................ 259
10.23.2.2 EDCA backoff procedure ........................................................................ 259
10.23.2.4 Obtaining an EDCA TXOP ..................................................................... 260
10.23.2.5 EDCA channel access in a VHT, HE, or TVHT BSS ............................. 261
10.23.2.7 Sharing an EDCA TXOP......................................................................... 262
10.23.2.8 Multiple frame transmission in an EDCA TXOP.................................... 263
10.23.2.9 TXOP limits............................................................................................. 265
10.23.2.10 Truncation of TXOP ................................................................................ 267
10.23.2.11 Termination of TXOP.............................................................................. 267
10.23.2.12 Retransmit procedures ............................................................................. 267
10.23.3 HCF controlled channel access (HCCA) ................................................................... 268
10.23.3.5 HCCA transfer rules ................................................................................ 268
10.25 Block acknowledgment (block ack) ........................................................................................ 268
10.25.2 Setup and modification of the block ack parameters................................................. 268
10.25.5 Selection of BlockAck and BlockAckReq variants................................................... 268
10.25.6 HT-immediate block ack extensions.......................................................................... 269
10.25.6.1 Introduction to HT-immediate block ack extensions............................... 269
10.25.6.3 Scoreboard context control during full-state operation ........................... 270
10.25.6.5 Generation and transmission of BlockAck frames by an HT STA,
DMG STA, or S1G STA.......................................................................... 270
10.25.6.6 Receive reordering buffer control operation............................................ 270
10.25.8 GCR and GLK-GCR block ack ................................................................................. 271
10.25.8.1 Introduction General ................................................................................ 271
10.25.8.4 GCR block ack BlockAckReq and BlockAck frame exchanges ............. 271
10.27 Protection mechanisms ............................................................................................................ 273
10.27.6 Protection rules for HE STAs .................................................................................... 273
Authorized licensed use limited to: University of Electronic Science and Tech of China. Downloaded on October 20,2021 at 09:30:27 UTC from IEEE Xplore. Restrictions apply.
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