Design #337: 5GHz 40 MHz channel bandwidth (HT40) - qMp (Quick Mesh Project) - Packages - qMp (Quick Mesh Project) and BMX6/BMX7 development site

Actions

Copy link

Design #337

tancat

5GHz 40 MHz channel bandwidth (HT40)

Afegit per Roger Pueyo Centelles fa més de 9 anys. Actualitzat fa casi 9 anys.

Estat:

Tancat

Prioritat:

Alta

Assignat a:

Roger Pueyo Centelles

Categoria:

802.11n driver

Versió prevista:

Inici:

15-01-2015

Data de venciment:

% realitzat:

Temps previst:

Temps invertit:

2:00 h

Descripció

It seems that, at least with some ath9k devices, not all 5 GHz channels with 40 MHz bandwidth combinations are valid. For instance:

~~36-~~
36
36+
40-
40
~~40+~~
~~44-~~
44
44+
...

Actually, putting HT40+/HT40- in /etc/config/wireless has no effect on the side used to extend to the 40MHz:

Channel 36 HT20

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 36 (5.180 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -95 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 44
    wdev 0xf
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 36 (5180 MHz), width: 20 MHz, center1: 5180 MHz

Channel 36 HT40

wlan0     ESSID: "community-lab.net" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 36 (5.180 GHz)
          Tx-Power: 17 dBm  Link Quality: 20/70
          Signal: -90 dBm  Noise: -94 dBm
          Bit Rate: 6.0 MBit/s
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 46
    wdev 0x10
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 36 (5180 MHz), width: 40 MHz, center1: 5190 MHz

Channel 36 HT40-

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 36 (5.180 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -94 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 48
    wdev 0x11
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 36 (5180 MHz), width: 40 MHz, center1: 5190 MHz

Channel 36 HT40+

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 36 (5.180 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -94 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 50
    wdev 0x12
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 36 (5180 MHz), width: 40 MHz, center1: 5190 MHz

Channel 40 HT20

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 40 (5.200 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -93 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 52
    wdev 0x13
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 40 (5200 MHz), width: 20 MHz, center1: 5200 MHz

Channel 40 HT40

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 40 (5.200 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -93 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 54
    wdev 0x14
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 40 (5200 MHz), width: 40 MHz, center1: 5190 MHz

Channel 40 HT40-

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 40 (5.200 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -93 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 72
    wdev 0x1d
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 40 (5200 MHz), width: 40 MHz, center1: 5190 MHz

Channel 40 HT40+

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 40 (5.200 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -91 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 56
    wdev 0x15
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 40 (5200 MHz), width: 40 MHz, center1: 5190 MHz

Channel 44 HT20

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 44 (5.220 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -95 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 60
    wdev 0x17
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 44 (5220 MHz), width: 20 MHz, center1: 5220 MHz

Channel 44 HT40

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 44 (5.220 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -94 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 62
    wdev 0x18
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 44 (5220 MHz), width: 40 MHz, center1: 5230 MHz

Channel 44 HT40-

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 44 (5.220 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -93 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 64
    wdev 0x19
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 44 (5220 MHz), width: 40 MHz, center1: 5230 MHz

Channel 44 HT40+

wlan0     ESSID: "qMp" 
          Access Point: 02:CA:FF:EE:BA:BE
          Mode: Ad-Hoc  Channel: 44 (5.220 GHz)
          Tx-Power: 17 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: -93 dBm
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11an
          Hardware: 168C:0033 19B6:D014 [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

Interface wlan0
    ifindex 66
    wdev 0x1a
    addr 4c:5e:0c:10:05:2f
    ssid qMp
    type IBSS
    wiphy 0
    channel 44 (5220 MHz), width: 40 MHz, center1: 5230 MHz

etc.

So, the pattern is: starting from the lowest channel, use the upper and the lower side alternatively. See:

36 HT20
36 HT40 (+)

40 HT20
40 HT40 (-)

44 HT20
44 HT40 (+)

48 HT20
48 HT40 (-)

52 HT20
52 HT40 (+)

56 HT20
56 HT40 (-)

60 HT20
60 HT40 (+)

64 HT20
64 HT40 (-)

No problem up to here. Then:

100 HT20
100 HT40 (+)

104 HT20
104 HT40 (-)

108 HT20
108 HT40 (+)

112 HT20
112 HT40 (-)

116 HT20
116 HT40 (+)

120 HT20
120 HT40 (-)

124 HT20
124 HT40 (+)

128 HT20
128 HT40 (-)

132 HT20
132 HT40 (+)

136 HT20
136 HT40 (-)

140 HT20
140 HT40 This one won't work, neither HT40, HT40- nor HT40+

And the upper channels:

149 HT20
149 HT40 (+)

153 HT20
153 HT40 (-)

157 HT20
157 HT40 (+)

161 HT20
161 HT40 (-)

165 HT20
165 HT40 This one won't work, neither HT40, HT40- nor HT40+

So, the routine that provides the available channels should be reviewed.

Actions

Copy link

Actualitzat per Roger Pueyo Centelles fa casi 9 anys

Estat ha canviat de Nou a Tancat
Assignat a ha canviat de Pau Escrich a Roger Pueyo Centelles

Fixed in commit 6d93e80822f077cedbc74acc581471983d4a6ca3.

qmpinfo channels (dev) now returns the valid HT40+/HT40- property for each 5 GHz channel, if applicable, to only use those valid in OpenWrt.

Actions

Copy link

També disponible a: Atom PDF

Projecte

General

Perfil

qMp (Quick Mesh Project) - Packages

Consultes personalitzades

Design #337

5GHz 40 MHz channel bandwidth (HT40)

Actualitzat per Roger Pueyo Centelles fa casi 9 anys