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IEEE 802.11

  • IEEE 802.11
    • Wi-Fi
  • OFDMA
  • BSS Coloring
  • Beamforming
  • WPA3
  • WEP
  • WDS
  • AP - Access Point
  • Station = AP
  • Plug-n-Share
  • IBBS - Ad Hoc
  • 802.11k/v/r - WiFi 快速漫游协议

  • IEEE 802.11n - Wi-Fi 4
    • 150Mbps - 低端规格
    • 300Mbps - 目前常见
  • AC - IEEE 802.11ac - Wi-Fi 5
    • AC2900 -> 2900Mbps
    • MIMO
  • AX - IEEE 802.11ax - Wi-Fi 6
    • AX1800 -> 1800 Mbps
      • 2.4 GHz 574 Mbps + 5 GHz 1201 Mbps
WiFi 4WiFi 5WiFi 6/6EWiFi 7
Date200720132019/20212024
IEEE802.11n802.11ac802.11ax802.11be
Date Rate1.2Gbps3.5Gbps9.6Gbps46Gbps
Bands2.5,5GHz5GHz2.5,5GHz/6GHz1-7.25GHz
SecurityWPA2WPA2WPA3WPA3
Channels20,40MHz20,40,80,80+80,160MHzsame as WiFi 5<= 320MHz
Modulation64 QAM, OFDM256 QAM, OFDM1024 QAM, OFDMA4096 QAM, OFDMA
MIMO4x4 MIMO4x4 MIMO,DL MU-MIMO8x8 UL/DL MU-MIMO16x16 MU-MIMO
  • WiFi 7 - 9.6 Gbpsx1.2x2x2=46 Gbps

traffic

IEEEData Rate
IEEE 802.11a54 Mbps
IEEE 802.11b11 Mbps
IEEE 802.11g54 Mbps
IEEE 802.11n450 Mbps
IEEE 802.11ac1734 Mbps
1024QAM (2.4GHz)750 Mbps
1024QAM (5GHz)2167 Mbps
IEEEfor
802.11smesh networking
802.11r
802.11w

  • IEEE 802.11ax
    • 替代 IEEE 802.11ac
    • 用于高密度场景
    • OFDMA - Orthogonal frequency-division multiple access
    • Wi-Fi 6 - 2.4 GHz, 5 GHz
    • Wi-Fi 6E - 6 GHz

WiFi Roaming

  • Scanning
  • Authentication
  • Re-association
  • 常见 AP 自带功能 - 无线客户端的信号低于设定值主动断开连接

Mesh

  • 硬件 - IEEE 802.11s
    • Linux IEEE 802.11s
    • 有线 Mesh
    • 无线 Mesh
      • 三频 - 预留一个频段用于 Mesh 回程
  • 动态链路状态
  • AC+AP - 最佳、需要预布线

Security