11n 配置
配置原文
##### IEEE 802.11n related configuration ######################################
# ieee80211n: Whether IEEE 802.11n (HT) is enabled
# 0 = disabled (default)
# 1 = enabled
# Note: You will also need to enable WMM for full HT functionality.
# Note: hw_mode=g (2.4 GHz) and hw_mode=a (5 GHz) is used to specify the band.
#ieee80211n=1
# disable_11n: Boolean (0/1) to disable HT for a specific BSS
#disable_11n=0
# ht_capab: HT capabilities (list of flags)
# LDPC coding capability: [LDPC] = supported
# Supported channel width set: [HT40-] = both 20 MHz and 40 MHz with secondary
# channel below the primary channel; [HT40+] = both 20 MHz and 40 MHz
# with secondary channel above the primary channel
# (20 MHz only if neither is set)
# Note: There are limits on which channels can be used with HT40- and
# HT40+. Following table shows the channels that may be available for
# HT40- and HT40+ use per IEEE 802.11n Annex J:
# freq HT40- HT40+
# 2.4 GHz 5-13 1-7 (1-9 in Europe/Japan)
# 5 GHz 40,48,56,64 36,44,52,60
# (depending on the location, not all of these channels may be available
# for use)
# Please note that 40 MHz channels may switch their primary and secondary
# channels if needed or creation of 40 MHz channel maybe rejected based
# on overlapping BSSes. These changes are done automatically when hostapd
# is setting up the 40 MHz channel.
# HT-greenfield: [GF] (disabled if not set)
# Short GI for 20 MHz: [SHORT-GI-20] (disabled if not set)
# Short GI for 40 MHz: [SHORT-GI-40] (disabled if not set)
# Tx STBC: [TX-STBC] (disabled if not set)
# Rx STBC: [RX-STBC1] (one spatial stream), [RX-STBC12] (one or two spatial
# streams), or [RX-STBC123] (one, two, or three spatial streams); Rx STBC
# disabled if none of these set
# HT-delayed Block Ack: [DELAYED-BA] (disabled if not set)
# Maximum A-MSDU length: [MAX-AMSDU-7935] for 7935 octets (3839 octets if not
# set)
# DSSS/CCK Mode in 40 MHz: [DSSS_CCK-40] = allowed (not allowed if not set)
# 40 MHz intolerant [40-INTOLERANT] (not advertised if not set)
# L-SIG TXOP protection support: [LSIG-TXOP-PROT] (disabled if not set)
#ht_capab=[HT40-][SHORT-GI-20][SHORT-GI-40]
# Require stations to support HT PHY (reject association if they do not)
#require_ht=1
# If set non-zero, require stations to perform scans of overlapping
# channels to test for stations which would be affected by 40 MHz traffic.
# This parameter sets the interval in seconds between these scans. Setting this
# to non-zero allows 2.4 GHz band AP to move dynamically to a 40 MHz channel if
# no co-existence issues with neighboring devices are found.
#obss_interval=0
# ht_vht_twt_responder: Whether TWT responder is enabled in HT and VHT modes
# 0 = disable; Disable TWT responder support in HT and VHT modes (default).
# 1 = enable; Enable TWT responder support in HT and VHT modes if supported by
# the driver.
#ht_vht_twt_responder=0
OpenWRT 配置修正
uci set wireless.radio0.ldpc=0
uci set wireless.radio0.rx_stbc=0
uci set wireless.radio0.max_amsdu=0
uci commit wireless
reload_config
mac80211_hwsim 设备不支持以上参数，待详查，影响如下
OpenWRT 配置修正影响
# 原始
ht_capab=[LDPC][SHORT-GI-20][RX-STBC123][MAX-AMSDU-7935][DSSS_CCK-40]
# 修正
ht_capab=[SHORT-GI-20][SHORT-GI-40][DSSS_CCK-40]
测试频段为 2.4G，其他频段的修正待查，mac80211_hwsim 仿真理论上可以欺骗 mac 层
高通驱动在 sys 目录下直接导出支持的 capabilities，mac80211 使用 iw 命令，有待改进
选项解析
启用 802.11n
ieee80211n=1
#disable_11n=0
ht_capab 配置
ieee80211n=1
#disable_11n=0