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WL1273 TX Power on 802.11a

Bryan DE FARIA
Prodigy 200 points

Hi,

 When I try to change the TX Power using wlan_cu commands or through the ini file, I can't observe any changes on the 5GHz channels while it works perfectly for 2.4GHz.

For 2.4 Ghz the Tx power can be set using the command tx_power_dBm_div10 of wlan_cu, is there a way to make it works on 5Ghz frequencies?

 

Regards,

Bryan DE FARIA 

  • 0
    TI__Mastermind 18455 points

     Hi Brian,

    There shouldn't be a limitation on 5Ghz band.
    However, this band is more sensitive to regularity restrictions and the wlan driver doesn't change the Tx power automatically, but checks first if we don't violate any regulatory restrictions on the current working channel.

    Thanks,
    Alon.S

  • 0 in reply to Alon Srednizki
    Prodigy 200 points

    Hi Alon,

     My issue is that I can't even reduce the TX power, if I try to decrease the TX power value in wlan_cu or in the ini file I cannot observe any changes.

    Does it mean th TX Power is at the lowest level and cannot be changed ?

    Thanks,

    Bryan

  • 0 in reply to Bryan DE FARIA
    TI__Genius 9240 points
    Hi Bryan,
    i understand that you tried to decrease the TX power, however did you also try to increase it? that is isent it working both directions?
    Can you please provide the levels and the commands that tried in addition please type the following and send the log you get:
     
    iw phy0 info
     
    iw reg get
     
     
    Regards,
    Eyal
     
  • 0 in reply to Eyal a
    Prodigy 200 points

    Hi Eyal,

    I tried to increase and decrease the Tx power, none of these directions work.
    I use the folowing commands with wlan_cu :

    \> Driver/, Connection/, Management/, Show/, Privacy/, scAn/, roaminG/, qOs/, poWer/, eVents/, Bt coexsistance/, Report/, dEbug/, biT/, aboUt, Quit
    M
    .../Management> connect moDe, Channel, Rate, Mode, Frag, rTs, Preamble, sLot, rAdio on/off, Info, siGnal, snr ratiO, tX_power_table, tx_power_dBm_div10, 802_11d_h/, beacoN/, adVanced/
    b 0
    Tx Power in DBM = 0
    .../Management> connect moDe, Channel, Rate, Mode, Frag, rTs, Preamble, sLot, rAdio on/off, Info, siGnal, snr ratiO, tX_power_table, tx_power_dBm_div10, 802_11d_h/, beacoN/, adVanced/
    b
    Tx Power in DBM = 0
    .../Management> connect moDe, Channel, Rate, Mode, Frag, rTs, Preamble, sLot, rAdio on/off, Info, siGnal, snr ratiO, tX_power_table, tx_power_dBm_div10, 802_11d_h/, beacoN/, adVanced/
    b 250
    Tx Power in DBM = 250
    .../Management> connect moDe, Channel, Rate, Mode, Frag, rTs, Preamble, sLot, rAdio on/off, Info, siGnal, snr ratiO, tX_power_table, tx_power_dBm_div10, 802_11d_h/, beacoN/, adVanced/
    b
    Tx Power in DBM = 250


    I see the tx power level decrease and increase on 2.4Ghz channels (monitored on the access point), but nothing move on 5GHz.

    I could not make work the iw command with the driver I am using (2.6.34 kernel + Wilink 6 driver). Can this driver be a limitation for the 5Ghz Tx Power regulation ?

    Thanks,
    Bryan

     

  • 0 in reply to Bryan DE FARIA
    TI__Genius 9240 points

    Hi,

     Just to make sure we are not on DFS channel, which channel are you using? also had you tried to perform that action on different channel?

     In addition you can get CLI information in http://processors.wiki.ti.com/index.php/OMAP35x_Wireless_Connectivity_WL1271_Command_Line_Interface_(CLI)_User%27s_Guide

     Can you verify the following parameters: d_cOuntry_5ie, dfS_range

    In:

    .../Management> connect moDe, Channel, Rate, Mode, Frag, rTs, prEamble, sLot, rAdio on/off,

    Info, siGnal, snr ratiO, tX_power_table, tx_power_dBm_div10, tx_poWer_level, 802_11d_h/,

    beacoN/, adVanced/

    8

    .../802_11d_h> D_enabledisable, H_enabledisable, d_Country_2_4ie, d_cOuntry_5ie, dfS_range

     

     Regards,

    Eyal

  • 0 in reply to Eyal a
    Prodigy 200 points

    Hi Eyal,

    What do you mean by "make sure we are not on DFS channel" ?

    I tried to enable 802.11d/h using a specific country code,  and I was connected to a DFS channel for example the channel 165 with a US country code : 

     .../802_11d_h> D_enabledisable, H_enabledisable, d_Country_2_4ie, d_cOuntry_5ie, dfS_range
    o
    802_11d Country for 5 GHz is US
    s
    DFS_range: dfS_range <min DFS channel (36..180)>
    <max DFS channel (36..180)>

     Do you mean I can't change Tx power on DFS channels ?

    Regards,

    Bryan

  • 0 in reply to Bryan DE FARIA
    TI__Genius 9240 points

    Hi Bryan,

    It is possible to modify the TX power of DFS channels, however the Driver will not start transmitting in DFS channel before it received someone else in the DFS channels (that is according to 802.11h spec)

    any way, which channel had you used?

    Regards,

    Eyal