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WL1837MOD: Linux: WL1835 FW: R8.7 SP3 CE test FAILS for RF 5G Wifi adaptivity

kh Tan
Prodigy 80 points
Part Number: WL1837MOD

Hi, we are undergoing CE certification test, but the result shows that we had failed the 5G Adaptivity test. The below picture said that the green signal should direct cut off after the blue signal off.

The Lab suggests us to change the detect sensitive. May I know how we can change the RF param or any setting in the wifi in order to pass this 5G Adaptive test?

We are using Debian, and below is our setting with the configure-device.sh

Are you using a TI module? [y/n] : y
What is the chip flavor? [1801/1805/1807/1831/1835/1837 or 0 for unknown] : 1837
Should Japanese standards be applied? [y/n] : y
How many 2.4GHz antennas are fitted? [1/2] : 1
How many 5GHz antennas are fitted (using 2 antennas requires a proper switch)? [0/1/2] : 1
Should SISO40 support be applied? [y/n] : y

We didn't change anything in the in the file, so we are using the official WL1837MOD_INI_FCC_CE_JP.ini

The following command are used to run the 5G Wifi Adaptivity Test in Stattion mode

calibrator wlan0 plt power_mode off

nmcli radio wifi on

nmcli deve wifi connect 5G password 12345678

The required result should be as below

  • 0
    TI__Genius 12740 points

    HI,

    You should not be adjusting anything in the Radio. When we see an issue with adaptivity we need to first confirm a few things:

    1) What region are you set to. Ensure that you have set on of the CE regions

    2) The test is done at the application level. and connected to an AP

    3) The calibration is important here. Ensure that this test is all done conducted and not radiated. You need to ensure that the signal level to the DUT is calibrated for the test.

    To check to see if adaptivity is working, you can try to increase the interferer signal by 10dB to see if adaptivity kicks in.

    Thanks,

    Riz

  • 0 in reply to Rizwan Murji
    Prodigy 80 points

    Hi,

    Thanks for your reply.

    1) What region are you set to. Ensure that you have set on of the CE regions

    May I know how we can set the regions in the device? We are using a Debian OS. Currently, I only use configure-device.sh provided by TI from here and set to Japan Standard

    2) The test is done at the application level. and connected to an AP

    Yes, we are connecting the device to a router using nmcli command from the linux

    3) The calibration is important here. Ensure that this test is all done conducted and not radiated. You need to ensure that the signal level to the DUT is calibrated for the test.

    May I know how can I ensure that the signal level to the DUT is calibrated? Is there any document that I can refer to?

    Thanks

    Tan

  • 0 in reply to kh Tan
    TI__Genius 12740 points

    Hi Tan,

    My apologies for the late reply. Please see my comments below:

    1) What region are you set to. Ensure that you have set on of the CE regions

    May I know how we can set the regions in the device? We are using a Debian OS. Currently, I only use configure-device.sh provided by TI from here and set to Japan Standard

    [RM] you need to use iw reg get to see what region you are set too. If it is not one of the EU regions, then you can use iw reg set XX where XX is the ascii country code.

    2) The test is done at the application level. and connected to an AP

    Yes, we are connecting the device to a router using nmcli command from the linux

    [RM] OK but for this test you can also use iperf.

    3) The calibration is important here. Ensure that this test is all done conducted and not radiated. You need to ensure that the signal level to the DUT is calibrated for the test.

    May I know how can I ensure that the signal level to the DUT is calibrated? Is there any document that I can refer to?

    [RM] here it is important that the cable loss from the generator that is playing the interfere signal is appropriately calibrated to the signal reaching the DUT. Remember that for adaptivity the signal elves are quite low, so it is important the you have calibrated to the DUT input. I would suggest that the generator you are using for the interfere signal be set at ~0 dBm, then you use external attenuation to get to in interfere signal level you need. The signal generator is more accurate at 0dBm then it would be at -60dBm.

    Hope this helps.

    Thanks,

    Riz