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TDA4VM: Intel9260 wifi on TDA4 AI board is only 54Mbps

Shine
Genius 13655 points
Part Number: TDA4VM

Hello Champs,

Customer is using PCIe wifi with Intel9260 on TDA4 AI board, but the bandwidth is only 20MHz, the hostapd only supports cfg80211g. How to improve the bandwidth to 40/80MHz cfg80211n?

root@tda4vm-sk:/usr/share/intel9260# iw wlp1s0 info
Interface wlp1s0
ifindex 7
wdev 0x1
addr 00:e1:8c:c9:7f:34
ssid J7SK-AP_8cc97f
type AP
wiphy 0
channel 11 (2462 MHz), width: 20 MHz, center1: 2462 MHz
txpower 22.00 dBm
multicast TXQ:
qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets
0 0 34 0 0 0 0 8974 34

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Thanks
Regards
Shine

  • +1
    TI__Guru 50103 points

    Hi Shine,

    Adding ht_capab=[HT40+] like the following in /usr/share/intel9260/hostapd.conf increased bandwidth to 40 MHz:

    ##### 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.
    ieee80211n=1
    wmm_enabled=1
    ht_capab=[HT40+]

    And here are some logs:

    root@j7-evm:/usr/share/intel9260# iw wlp1s0 info
    Interface wlp1s0
    ifindex 10
    wdev 0x2
    addr 14:75:5b:54:dd:8d
    ssid J7SK-AP
    type AP
    wiphy 0
    channel 5 (2432 MHz), width: 40 MHz, center1: 2442 MHz
    txpower 22.00 dBm
    multicast TXQ:
    qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets
    0 0 0 0 0 0 0 0 0
    root@j7-evm:/usr/share/intel9260#

    Regards,

    Takuma

  • 0 in reply to Takuma Fujiwara
    Prodigy 190 points

    Hello，

    According to this modification can indeed be modified successfully, but my purpose is to improve the network speed, and the hw_mode in the hostapd file can only support a/b/g, the maximum theoretical rate is only 54 Mbps, could you please tell me how to support 802.11n to reach 300 Mbps?

  • 0 in reply to maxuezhao ma
    TI__Guru 50103 points

    Hi Maxuezhao,

    As a disclaimer, expertise within TI is limited in terms of what Intel provides for their drivers for their chip, so our knowledge will be limited to what can be found on the internet in regards to using hostapd to support 802.11n.

    From a community forum post, I see the following response:

    """

    To have 802.11n mode, in your /etc/hostapd.conf you need the directives:

    hw_mode=g
    ieee80211n=1
    ht_capab=[SHORT-GI-40][HT40+][HT40-][DSSS_CCK-40]

    So basically, you need support for g mode, with 802.11n extensions, and the ht_capab directive is for enabling support for 40MHz. If your chipset does not support 40MHz bandwidth, comment it out.

    """

    Based on this, it looks like setting ieee80211n=1 should mean that 802.11n is enabled.

    Regards,

    Takuma