WL1837 WLAN Rx Coexistence Issue

Scott Brewer16

Other Parts Discussed in Thread: WL1837, WL1837MOD

I am working on a custom board using a iMX6 processor and a WL1837 radio module. I appear to be experiencing a problem related to Bluetooth coexistence which is severely impacting WLAN traffic in the Rx direction. The Wifi TX path of the WL1837 is fine during my tests. I integrated the WL1837 module into my system using the documentation found in the getting started guide.

http://processors.wiki.ti.com/index.php/WL18xx_First_Time_Getting_Started_Guide_%28IMX6%29

I have searched the forums for similar problems, but have not found a solution. Today I tested R8.6 SP1 (http://processors.wiki.ti.com/index.php/WiLink8_Release_Notes/R8.6_SP1) and the problem did not go away. Here are the details of my setup.

Software Setup

Android 5.1.1 (BSP from NXP)
WL1837 R8.6 SP1 driver
MAC FW Rev 8.9.0.1.55
PHY FW Rev 8.2.0.0.233
Bluetooth Init Script FROM SP 3.9 (downloaded from www.ti.com/.../WL18XX-BT-SP)

Wireless Setup

802.11g (CH 6) excellent signal strength, -49 dBm
WPA2-PSK AES
Bluetooth Headset Connected (HFP BTSCO Audio via WL1837 PCM interface. WL1837 is PCM Master)

My main application is video conferencing. However, I’ve been able to show this problem by running iperf on my board in server mode and pairing a headset. Here are the reproduction steps and test details.

Turn Bluetooth Off
Connect the device to a to a 2.4 Ghz Wifi network.
On the device run iperf in server mode (iperf -s)
Start an iperf throughput from PC. Data packets may be TCP or UDP.
In my environment I am seeing throughput of ~10 Mbits/sec.
Enable Bluetooth (optionally Pair a headset)
Throughput drops to about 5Mbits/sec.
After ~30-90 seconds the throughput drops to 0
Turn Bluetooth off, after about ~30 seconds the throughput is 10Mbits/sec again.

Additional Information

The same issue is not observed if I connect the WL1837 to a 5 Ghz wifi network, so I am pretty sure this is a coexistence problem.
The same issue is not observed if I run iperf as a client on my device and my PC as the server. So it appears that WiFi Rx is getting starved.
Using the wlconf utility I tired to turn off the coexistence algorithm by changing the core.sg.state variable to 0. In this mode Wifi Rx does not cut out, Bluetooth SCO audio quality is severely impacted.
The same problem happens with a WL1837MOD eval module and a SabreSD board.

I need help from TI to resolve this issue. For example, is there a special calibration process that must be done to tune the SG Coexistence parameters? Any advice and suggestions are welcome.

Scott

over 9 years ago

0 Joseph Gigi over 9 years ago

TI__Guru* 85400 points

Hi Scott,

SCO and A2DP have higher priority over WLAN during CoEx scenario.
You can refer to: www.ti.com/.../swru423 for the expected throughput numbers under single role and Co Ex.
Please see sections "8.1 Single-Role" and "8.4.1 WLAN Single Role – Bluetooth Performance"

You can also take a look at: processors.wiki.ti.com/.../WiLink8_-_TI_Coexistense_Tutorial_1.pdf - this is a tutorial on the CoEx architecture.

A few questions:

(1) Why 11g? 10 Mbps in single role is itself very low to begin with.
(2) What's the configured SCO packet type?
(3) Are there other devices in the neighbourhood?
(4) Have you run the "configure-device.sh" script to generate the wl18xx-conf.bin file?

Regards,
Gigi Joseph.

0 Scott Brewer16 over 9 years ago in reply to Joseph Gigi

Prodigy 150 points

Hi Gigi, thanks for getting back to me. Here are the answers to your questions.

1) I wanted to test WLAN performance in the worst case. I tested 802.11n and I see the same issue.

2) We are using Android 5.1.1 with Bluedroid. WBS is not being used. I added debug to the stack to try and determine which SCO packet was being used. The SCO connection is being created with a supported packet mask 0x38F.

       (BTM_SCO_PKT_TYPES_MASK_HV1      + /* Packet Types                             */
        BTM_SCO_PKT_TYPES_MASK_HV2      +
        BTM_SCO_PKT_TYPES_MASK_HV3      +
        BTM_SCO_PKT_TYPES_MASK_EV3      +
        BTM_SCO_PKT_TYPES_MASK_EV4      +
        BTM_SCO_PKT_TYPES_MASK_EV5      +
        BTM_SCO_PKT_TYPES_MASK_NO_2_EV5 +
        BTM_SCO_PKT_TYPES_MASK_NO_3_EV5)

3) Yes, there are many devices in the area.

4) Yes

Have you tested the coexistence support with Android and the Bluedroid stack? I'm wondering if it would be worth while spending some time trying to get the BlueZ stack running on my device.

As I mentioned there are lots of devices in my area, so today I tested in a faraday cage. Here is a summary of the throughput results. I believe these show that there is an issue with the coexistence algorithm. I'm curious if others see the same issue with a similar setup?

Summary: 802.11n, Channel 6, Open Network, Bluetooth Off, DLINK Router, Iperf output follows

Accepted connection from 192.168.1.202, port 49780

[ 5] local 192.168.1.209 port 5201 connected to 192.168.1.202 port 49781

[ ID] Interval Transfer Bandwidth

[ 5] 0.00-1.00 sec 5.63 MBytes 47.2 Mbits/sec

[ 5] 1.00-2.00 sec 6.19 MBytes 51.9 Mbits/sec

[ 5] 2.00-3.00 sec 5.98 MBytes 50.1 Mbits/sec

[ 5] 3.00-4.00 sec 6.25 MBytes 52.4 Mbits/sec

[ 5] 4.00-5.00 sec 6.32 MBytes 53.0 Mbits/sec

[ 5] 5.00-6.00 sec 6.22 MBytes 52.2 Mbits/sec

[ 5] 6.00-7.00 sec 6.14 MBytes 51.5 Mbits/sec

[ 5] 7.00-8.00 sec 6.22 MBytes 52.2 Mbits/sec

[ 5] 8.00-9.00 sec 6.21 MBytes 52.1 Mbits/sec

[ 5] 9.00-10.00 sec 6.06 MBytes 50.8 Mbits/sec

[ 5] 10.00-10.03 sec 162 KBytes 51.5 Mbits/sec

- - - - - - - - - - - - - - - - - - - - - - - - -

[ ID] Interval Transfer Bandwidth

[ 5] 0.00-10.03 sec 61.4 MBytes 51.4 Mbits/sec sender

[ 5] 0.00-10.03 sec 61.4 MBytes 51.4 Mbits/sec receiver

-----------------------------------------------------------

These results are excellent! Now the same test with Bluetooth On and a Headset connected with SCO audio being played to the headset.

Accepted connection from 192.168.1.202, port 49788

[ 5] local 192.168.1.209 port 5201 connected to 192.168.1.202 port 49789

[ ID] Interval Transfer Bandwidth

[ 5] 0.00-1.00 sec 1.12 MBytes 9.41 Mbits/sec

[ 5] 1.00-2.00 sec 1.11 MBytes 9.32 Mbits/sec

[ 5] 2.00-3.00 sec 476 KBytes 3.90 Mbits/sec

[ 5] 3.00-4.00 sec 843 KBytes 6.92 Mbits/sec

[ 5] 4.00-5.00 sec 920 KBytes 7.54 Mbits/sec

[ 5] 5.00-6.00 sec 869 KBytes 7.12 Mbits/sec

[ 5] 6.00-7.00 sec 861 KBytes 7.05 Mbits/sec

[ 5] 7.00-8.00 sec 667 KBytes 5.46 Mbits/sec

[ 5] 8.00-9.00 sec 943 KBytes 7.73 Mbits/sec

[ 5] 9.00-10.00 sec 1004 KBytes 8.22 Mbits/sec

[ 5] 10.00-11.00 sec 325 KBytes 2.66 Mbits/sec

[ 5] 11.00-12.00 sec 397 KBytes 3.25 Mbits/sec

[ 5] 12.00-13.00 sec 770 KBytes 6.31 Mbits/sec

[ 5] 13.00-14.00 sec 706 KBytes 5.78 Mbits/sec

[ 5] 14.00-15.00 sec 1.01 MBytes 8.50 Mbits/sec

[ 5] 15.00-16.00 sec 816 KBytes 6.68 Mbits/sec

[ 5] 16.00-17.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 5] 17.00-18.00 sec 1.09 MBytes 9.17 Mbits/sec

[ 5] 18.00-19.00 sec 352 KBytes 2.89 Mbits/sec

[ 5] 19.00-20.00 sec 29.9 KBytes 245 Kbits/sec

[ 5] 20.00-21.00 sec 1.43 KBytes 11.7 Kbits/sec

[ 5] 21.00-22.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 22.00-23.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 23.00-24.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 24.00-25.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 25.00-26.00 sec 5.70 KBytes 46.8 Kbits/sec

[ 5] 26.00-27.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 27.00-28.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 28.00-29.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 29.00-30.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 30.00-31.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 31.00-32.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 32.00-33.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 33.00-34.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 34.00-35.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 35.00-36.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 36.00-37.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 37.00-38.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 38.00-39.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 39.00-40.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 40.00-41.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 41.00-42.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 42.00-43.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 43.00-44.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 44.00-45.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 45.00-46.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 46.00-47.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 47.00-48.00 sec 0.00 Bytes 0.00 bits/sec

[ 5] 48.00-49.00 sec 0.00 Bytes 0.00 bits/sec

iperf3: the client has unexpectedly closed the connection

-----------------------------------------------------------

Server listening on 5201

-----------------------------------------------------------

Accepted connection from 192.168.1.202, port 49790

[ 6] local 192.168.1.209 port 5201 connected to 192.168.1.202 port 49791

[ ID] Interval Transfer Bandwidth

[ 6] 0.00-1.00 sec 1.01 MBytes 8.50 Mbits/sec

[ 6] 1.00-2.00 sec 1.31 MBytes 11.0 Mbits/sec

[ 6] 2.00-3.00 sec 1.10 MBytes 9.24 Mbits/sec

[ 6] 3.00-4.00 sec 1.12 MBytes 9.40 Mbits/sec

[ 6] 4.00-5.00 sec 1.18 MBytes 9.89 Mbits/sec

[ 6] 5.00-6.00 sec 1.21 MBytes 10.1 Mbits/sec

[ 6] 6.00-7.00 sec 1.20 MBytes 10.0 Mbits/sec

[ 6] 7.00-8.00 sec 1.17 MBytes 9.79 Mbits/sec

[ 6] 8.00-9.00 sec 1.12 MBytes 9.38 Mbits/sec

[ 6] 9.00-10.00 sec 788 KBytes 6.46 Mbits/sec

[ 6] 10.00-11.00 sec 1.13 MBytes 9.45 Mbits/sec

[ 6] 11.00-12.00 sec 933 KBytes 7.65 Mbits/sec

[ 6] 12.00-13.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 6] 13.00-14.00 sec 1.22 MBytes 10.2 Mbits/sec

[ 6] 14.00-15.00 sec 615 KBytes 5.04 Mbits/sec

[ 6] 15.00-16.00 sec 1.14 MBytes 9.56 Mbits/sec

[ 6] 16.00-17.00 sec 1.18 MBytes 9.90 Mbits/sec

[ 6] 17.00-18.00 sec 1.29 MBytes 10.9 Mbits/sec

[ 6] 18.00-19.00 sec 413 KBytes 3.39 Mbits/sec

[ 6] 19.00-20.00 sec 783 KBytes 6.41 Mbits/sec

[ 6] 20.00-21.00 sec 1012 KBytes 8.29 Mbits/sec

[ 6] 21.00-22.00 sec 1.02 MBytes 8.52 Mbits/sec

[ 6] 22.00-23.00 sec 758 KBytes 6.21 Mbits/sec

[ 6] 23.00-24.00 sec 952 KBytes 7.79 Mbits/sec

[ 6] 24.00-25.00 sec 1.05 MBytes 8.80 Mbits/sec

[ 6] 25.00-26.00 sec 1.10 MBytes 9.25 Mbits/sec

[ 6] 26.00-27.00 sec 1.16 MBytes 9.77 Mbits/sec

[ 6] 27.00-28.00 sec 1.22 MBytes 10.3 Mbits/sec

[ 6] 28.00-29.00 sec 1.01 MBytes 8.43 Mbits/sec

[ 6] 29.00-30.00 sec 729 KBytes 5.98 Mbits/sec

[ 6] 30.00-31.00 sec 1.21 MBytes 10.1 Mbits/sec

[ 6] 31.00-32.00 sec 739 KBytes 6.05 Mbits/sec

[ 6] 32.00-33.00 sec 937 KBytes 7.67 Mbits/sec

[ 6] 33.00-34.00 sec 944 KBytes 7.74 Mbits/sec

[ 6] 34.00-35.00 sec 1.20 MBytes 10.0 Mbits/sec

[ 6] 35.00-36.00 sec 1.15 MBytes 9.68 Mbits/sec

[ 6] 36.00-37.00 sec 1020 KBytes 8.36 Mbits/sec

[ 6] 37.00-38.00 sec 274 KBytes 2.25 Mbits/sec

[ 6] 38.00-39.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 39.00-40.00 sec 79.8 KBytes 654 Kbits/sec

[ 6] 40.00-41.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 41.00-42.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 42.00-43.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 43.00-44.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 44.00-45.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 45.00-46.00 sec 57.0 KBytes 468 Kbits/sec

[ 6] 46.00-47.00 sec 792 KBytes 6.49 Mbits/sec

[ 6] 47.00-48.00 sec 1.15 MBytes 9.64 Mbits/sec

[ 6] 48.00-49.00 sec 861 KBytes 7.06 Mbits/sec

[ 6] 49.00-50.00 sec 771 KBytes 6.32 Mbits/sec

[ 6] 50.00-51.00 sec 1011 KBytes 8.28 Mbits/sec

[ 6] 51.00-52.00 sec 518 KBytes 4.24 Mbits/sec

[ 6] 52.00-53.00 sec 757 KBytes 6.20 Mbits/sec

[ 6] 53.00-54.00 sec 973 KBytes 7.97 Mbits/sec

[ 6] 54.00-55.00 sec 1.25 MBytes 10.5 Mbits/sec

[ 6] 55.00-56.00 sec 859 KBytes 7.04 Mbits/sec

[ 6] 56.00-57.00 sec 781 KBytes 6.40 Mbits/sec

[ 6] 57.00-58.00 sec 786 KBytes 6.44 Mbits/sec

[ 6] 58.00-59.00 sec 996 KBytes 8.16 Mbits/sec

[ 6] 59.00-60.00 sec 833 KBytes 6.82 Mbits/sec

[ 6] 60.00-61.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 6] 61.00-62.00 sec 1.04 MBytes 8.72 Mbits/sec

[ 6] 62.00-63.00 sec 915 KBytes 7.49 Mbits/sec

[ 6] 63.00-64.00 sec 1.18 MBytes 9.93 Mbits/sec

[ 6] 64.00-65.00 sec 707 KBytes 5.79 Mbits/sec

[ 6] 65.00-66.00 sec 293 KBytes 2.40 Mbits/sec

[ 6] 66.00-67.00 sec 431 KBytes 3.53 Mbits/sec

[ 6] 67.00-68.00 sec 1.07 MBytes 8.99 Mbits/sec

[ 6] 68.00-69.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 6] 69.00-70.00 sec 1.19 MBytes 10.0 Mbits/sec

[ 6] 70.00-71.00 sec 1.28 MBytes 10.7 Mbits/sec

[ 6] 71.00-72.00 sec 497 KBytes 4.07 Mbits/sec

[ 6] 72.00-73.00 sec 604 KBytes 4.95 Mbits/sec

[ 6] 73.00-74.00 sec 721 KBytes 5.90 Mbits/sec

[ 6] 74.00-75.00 sec 628 KBytes 5.15 Mbits/sec

[ 6] 75.00-76.00 sec 499 KBytes 4.09 Mbits/sec

[ 6] 76.00-77.00 sec 578 KBytes 4.74 Mbits/sec

[ 6] 77.00-78.00 sec 907 KBytes 7.43 Mbits/sec

[ 6] 78.00-79.00 sec 1.21 MBytes 10.2 Mbits/sec

[ 6] 79.00-80.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 6] 80.00-81.00 sec 1.17 MBytes 9.81 Mbits/sec

[ 6] 81.00-82.00 sec 891 KBytes 7.30 Mbits/sec

[ 6] 82.00-83.00 sec 215 KBytes 1.76 Mbits/sec

[ 6] 83.00-84.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 84.00-85.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 85.00-86.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 86.00-87.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 87.00-88.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 88.00-89.00 sec 802 KBytes 6.58 Mbits/sec

[ 6] 89.00-90.00 sec 839 KBytes 6.87 Mbits/sec

[ 6] 90.00-91.00 sec 1019 KBytes 8.35 Mbits/sec

[ 6] 91.00-92.00 sec 701 KBytes 5.74 Mbits/sec

[ 6] 92.00-93.00 sec 1.20 MBytes 10.1 Mbits/sec

[ 6] 93.00-94.00 sec 708 KBytes 5.80 Mbits/sec

[ 6] 94.00-95.00 sec 165 KBytes 1.35 Mbits/sec

[ 6] 95.00-96.00 sec 76.8 KBytes 629 Kbits/sec

[ 6] 96.00-97.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 97.00-98.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 98.00-99.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 99.00-100.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 100.00-101.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 101.00-102.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 102.00-103.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 103.00-104.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 104.00-105.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 105.00-106.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 106.00-107.00 sec 12.8 KBytes 105 Kbits/sec

[ 6] 107.00-108.00 sec 325 KBytes 2.66 Mbits/sec

[ 6] 108.00-109.00 sec 575 KBytes 4.71 Mbits/sec

[ 6] 109.00-110.00 sec 1.24 MBytes 10.4 Mbits/sec

[ 6] 110.00-111.00 sec 1.21 MBytes 10.1 Mbits/sec

[ 6] 111.00-112.00 sec 1.14 MBytes 9.52 Mbits/sec

[ 6] 112.00-113.00 sec 341 KBytes 2.79 Mbits/sec

[ 6] 113.00-114.00 sec 621 KBytes 5.09 Mbits/sec

[ 6] 114.00-115.00 sec 1.17 MBytes 9.83 Mbits/sec

[ 6] 115.00-116.00 sec 1.16 MBytes 9.69 Mbits/sec

[ 6] 116.00-117.00 sec 354 KBytes 2.90 Mbits/sec

[ 6] 117.00-118.00 sec 634 KBytes 5.20 Mbits/sec

[ 6] 118.00-119.00 sec 1.06 MBytes 8.90 Mbits/sec

[ 6] 119.00-120.00 sec 1.19 MBytes 9.95 Mbits/sec

[ 6] 120.00-121.00 sec 1.24 MBytes 10.4 Mbits/sec

[ 6] 121.00-122.00 sec 1.17 MBytes 9.81 Mbits/sec

[ 6] 122.00-123.00 sec 1.14 MBytes 9.54 Mbits/sec

[ 6] 123.00-124.00 sec 1.12 MBytes 9.46 Mbits/sec

[ 6] 124.00-125.00 sec 345 KBytes 2.83 Mbits/sec

[ 6] 125.00-126.00 sec 148 KBytes 1.21 Mbits/sec

[ 6] 126.00-127.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 127.00-128.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 128.00-129.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 129.00-130.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 130.00-131.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 131.00-132.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 132.00-133.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 133.00-134.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 134.00-135.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 135.00-136.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 136.00-137.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 137.00-138.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 138.00-139.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 139.00-140.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 140.00-141.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 141.00-142.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 142.00-143.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 143.00-144.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 144.00-145.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 145.00-146.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 146.00-147.00 sec 0.00 Bytes 0.00 bits/sec

[ 6] 147.00-148.00 sec 0.00 Bytes 0.00 bits/sec

iperf3: the client has unexpectedly closed the connection

As you can see the Rx throughput goes to 0 for a long time, sometimes it never recovers until Bluetooth is turned off. If I turn Bluetooth off the throughput goes back to ~50 Mbits/sec after 30 seconds or so. What's interesting to me is that I don't see the same issue with WLAN Tx.

0 Scott Brewer16 over 9 years ago in reply to Scott Brewer16

Prodigy 150 points

Wireless Traces.zip

These are the wireless traces from yesterdays tests. Perhaps they will provide further insight into this issue.

0 Scott Brewer16 over 9 years ago in reply to Scott Brewer16

Prodigy 150 points

I tried experimenting with the coexistence SG parameters by updating the wl18xx-conf.bin file. Nothing I changed seemed to have any effect on this issue. It seems to me that the WLAN Rx service period is interrupted very often when a bluetooth headset is paired, which makes Wifi un-usable. Are there any specific combination of parameters you could recommend to boost the WLAN receive priority?

I found something interesting today - some of the access points I tested seem to behave better during my testing. A LAP connected to a Cisco WLC and a NETGEAR WNDAP330 seemed better. Although better, I am still seeing up to 50% packet loss when trying to receive a 2Mbit UDP stream. My main use case for the WL1837 is to stream video while simultaneously using a bluetooth headset (with the handsfree profile). The SCO audio will also be sent/received over the WLAN. The secondary use case would be to receive video over the WLAN while using a bluetooth headset. When WLAN is connected in the 2.4 Ghz band there are too many dropped packets to successfully achieve the above use cases. In addition to the this there are a lot of pops in the SCO audio, which I believe is also due interference.

Do you have any ideas regarding what type of integration issues could cause the coexistence to break? I have changed the i2s frequency in the latest BTS script from 16Khz to 8Khz, all other parameters should be unchanged. Would it be possible to try this on Android and see if it is working? (It seems easy to reproduce).

Below is a dump of my wl18xx-conf.bin file. I've been trying to get wlan firmware dumps with wl_logproxy and glogger to no avail.

header.magic = 0x10e100ca
header.version = 0x00070007
header.checksum = 0x00000000
core.sg.params = 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000f, 0x0000001b, 0x00000011, 0x000000aa, 0x00000032, 0x00000064, 0x00000320, 0x000000c8, 0x000000c8, 0x00000000, 0x00000000, 0x00000000, 0x00000001, 0x00000000, 0x0000003c, 0x00001388, 0x000004b0, 0x000003e8, 0x00000001, 0x00000003, 0x00000006, 0x0000000a, 0x0000000a, 0x00000002, 0x00000005, 0x0000001e, 0x00000003, 0x0000000a, 0x00000002, 0x00000000, 0x00000019, 0x00000019, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000
core.sg.state = 0x01
core.rx.rx_msdu_life_time = 0x0007d000
core.rx.packet_detection_threshold = 0x00000000
core.rx.ps_poll_timeout = 0x000f
core.rx.upsd_timeout = 0x000f
core.rx.rts_threshold = 0x0931
core.rx.rx_cca_threshold = 0x0000
core.rx.irq_blk_threshold = 0xffff
core.rx.irq_pkt_threshold = 0x0000
core.rx.irq_timeout = 0x0258
core.rx.queue_type = 0x00
core.tx.tx_energy_detection = 0x00
core.tx.sta_rc_conf.enabled_rates = 0x00000000
core.tx.sta_rc_conf.short_retry_limit = 0x0a
core.tx.sta_rc_conf.long_retry_limit = 0x0a
core.tx.sta_rc_conf.aflags = 0x00
core.tx.ac_conf_count = 0x04
core.tx.ac_conf0.ac = 0x00
core.tx.ac_conf0.cw_min = 0x0f
core.tx.ac_conf0.cw_max = 0x003f
core.tx.ac_conf0.aifsn = 0x03
core.tx.ac_conf0.tx_op_limit = 0x0000
core.tx.ac_conf1.ac = 0x01
core.tx.ac_conf1.cw_min = 0x0f
core.tx.ac_conf1.cw_max = 0x003f
core.tx.ac_conf1.aifsn = 0x07
core.tx.ac_conf1.tx_op_limit = 0x0000
core.tx.ac_conf2.ac = 0x02
core.tx.ac_conf2.cw_min = 0x0f
core.tx.ac_conf2.cw_max = 0x003f
core.tx.ac_conf2.aifsn = 0x01
core.tx.ac_conf2.tx_op_limit = 0x0bc0
core.tx.ac_conf3.ac = 0x03
core.tx.ac_conf3.cw_min = 0x0f
core.tx.ac_conf3.cw_max = 0x003f
core.tx.ac_conf3.aifsn = 0x01
core.tx.ac_conf3.tx_op_limit = 0x05e0
core.tx.max_tx_retries = 0x64
core.tx.ap_aging_period = 0x012c
core.tx.tid_conf_count = 0x04
core.tx.tid_conf0.queue_id = 0x00
core.tx.tid_conf0.channel_type = 0x01
core.tx.tid_conf0.tsid = 0x00
core.tx.tid_conf0.ps_scheme = 0x00
core.tx.tid_conf0.ack_policy = 0x00
core.tx.tid_conf0.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf1.queue_id = 0x01
core.tx.tid_conf1.channel_type = 0x01
core.tx.tid_conf1.tsid = 0x01
core.tx.tid_conf1.ps_scheme = 0x00
core.tx.tid_conf1.ack_policy = 0x00
core.tx.tid_conf1.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf2.queue_id = 0x02
core.tx.tid_conf2.channel_type = 0x01
core.tx.tid_conf2.tsid = 0x02
core.tx.tid_conf2.ps_scheme = 0x00
core.tx.tid_conf2.ack_policy = 0x00
core.tx.tid_conf2.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf3.queue_id = 0x03
core.tx.tid_conf3.channel_type = 0x01
core.tx.tid_conf3.tsid = 0x03
core.tx.tid_conf3.ps_scheme = 0x00
core.tx.tid_conf3.ack_policy = 0x00
core.tx.tid_conf3.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf4.queue_id = 0x00
core.tx.tid_conf4.channel_type = 0x00
core.tx.tid_conf4.tsid = 0x00
core.tx.tid_conf4.ps_scheme = 0x00
core.tx.tid_conf4.ack_policy = 0x00
core.tx.tid_conf4.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf5.queue_id = 0x00
core.tx.tid_conf5.channel_type = 0x00
core.tx.tid_conf5.tsid = 0x00
core.tx.tid_conf5.ps_scheme = 0x00
core.tx.tid_conf5.ack_policy = 0x00
core.tx.tid_conf5.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf6.queue_id = 0x00
core.tx.tid_conf6.channel_type = 0x00
core.tx.tid_conf6.tsid = 0x00
core.tx.tid_conf6.ps_scheme = 0x00
core.tx.tid_conf6.ack_policy = 0x00
core.tx.tid_conf6.apsd_conf = 0x00000000, 0x00000000
core.tx.tid_conf7.queue_id = 0x00
core.tx.tid_conf7.channel_type = 0x00
core.tx.tid_conf7.tsid = 0x00
core.tx.tid_conf7.ps_scheme = 0x00
core.tx.tid_conf7.ack_policy = 0x00
core.tx.tid_conf7.apsd_conf = 0x00000000, 0x00000000
core.tx.frag_threshold = 0x0930
core.tx.tx_compl_timeout = 0x015e
core.tx.tx_compl_threshold = 0x000a
core.tx.basic_rate = 0x00000001
core.tx.basic_rate_5 = 0x00000008
core.tx.tmpl_short_retry_limit = 0x0a
core.tx.tmpl_long_retry_limit = 0x0a
core.tx.tx_watchdog_timeout = 0x00001388
core.tx.slow_link_thold = 0x03
core.tx.fast_link_thold = 0x1e
core.conn.wake_up_event = 0x02
core.conn.listen_interval = 0x01
core.conn.suspend_wake_up_event = 0x04
core.conn.suspend_listen_interval = 0x03
core.conn.bcn_filt_mode = 0x01
core.conn.bcn_filt_ie_count = 0x03
core.conn.bcn_filt_ie0.ie = 0x25
core.conn.bcn_filt_ie0.rule = 0x02
core.conn.bcn_filt_ie0.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie0.type = 0x00
core.conn.bcn_filt_ie0.version = 0x00, 0x00
core.conn.bcn_filt_ie1.ie = 0x3d
core.conn.bcn_filt_ie1.rule = 0x01
core.conn.bcn_filt_ie1.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie1.type = 0x00
core.conn.bcn_filt_ie1.version = 0x00, 0x00
core.conn.bcn_filt_ie2.ie = 0x2a
core.conn.bcn_filt_ie2.rule = 0x01
core.conn.bcn_filt_ie2.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie2.type = 0x00
core.conn.bcn_filt_ie2.version = 0x00, 0x00
core.conn.bcn_filt_ie3.ie = 0x00
core.conn.bcn_filt_ie3.rule = 0x00
core.conn.bcn_filt_ie3.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie3.type = 0x00
core.conn.bcn_filt_ie3.version = 0x00, 0x00
core.conn.bcn_filt_ie4.ie = 0x00
core.conn.bcn_filt_ie4.rule = 0x00
core.conn.bcn_filt_ie4.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie4.type = 0x00
core.conn.bcn_filt_ie4.version = 0x00, 0x00
core.conn.bcn_filt_ie5.ie = 0x00
core.conn.bcn_filt_ie5.rule = 0x00
core.conn.bcn_filt_ie5.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie5.type = 0x00
core.conn.bcn_filt_ie5.version = 0x00, 0x00
core.conn.bcn_filt_ie6.ie = 0x00
core.conn.bcn_filt_ie6.rule = 0x00
core.conn.bcn_filt_ie6.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie6.type = 0x00
core.conn.bcn_filt_ie6.version = 0x00, 0x00
core.conn.bcn_filt_ie7.ie = 0x00
core.conn.bcn_filt_ie7.rule = 0x00
core.conn.bcn_filt_ie7.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie7.type = 0x00
core.conn.bcn_filt_ie7.version = 0x00, 0x00
core.conn.bcn_filt_ie8.ie = 0x00
core.conn.bcn_filt_ie8.rule = 0x00
core.conn.bcn_filt_ie8.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie8.type = 0x00
core.conn.bcn_filt_ie8.version = 0x00, 0x00
core.conn.bcn_filt_ie9.ie = 0x00
core.conn.bcn_filt_ie9.rule = 0x00
core.conn.bcn_filt_ie9.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie9.type = 0x00
core.conn.bcn_filt_ie9.version = 0x00, 0x00
core.conn.bcn_filt_ie10.ie = 0x00
core.conn.bcn_filt_ie10.rule = 0x00
core.conn.bcn_filt_ie10.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie10.type = 0x00
core.conn.bcn_filt_ie10.version = 0x00, 0x00
core.conn.bcn_filt_ie11.ie = 0x00
core.conn.bcn_filt_ie11.rule = 0x00
core.conn.bcn_filt_ie11.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie11.type = 0x00
core.conn.bcn_filt_ie11.version = 0x00, 0x00
core.conn.bcn_filt_ie12.ie = 0x00
core.conn.bcn_filt_ie12.rule = 0x00
core.conn.bcn_filt_ie12.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie12.type = 0x00
core.conn.bcn_filt_ie12.version = 0x00, 0x00
core.conn.bcn_filt_ie13.ie = 0x00
core.conn.bcn_filt_ie13.rule = 0x00
core.conn.bcn_filt_ie13.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie13.type = 0x00
core.conn.bcn_filt_ie13.version = 0x00, 0x00
core.conn.bcn_filt_ie14.ie = 0x00
core.conn.bcn_filt_ie14.rule = 0x00
core.conn.bcn_filt_ie14.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie14.type = 0x00
core.conn.bcn_filt_ie14.version = 0x00, 0x00
core.conn.bcn_filt_ie15.ie = 0x00
core.conn.bcn_filt_ie15.rule = 0x00
core.conn.bcn_filt_ie15.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie15.type = 0x00
core.conn.bcn_filt_ie15.version = 0x00, 0x00
core.conn.bcn_filt_ie16.ie = 0x00
core.conn.bcn_filt_ie16.rule = 0x00
core.conn.bcn_filt_ie16.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie16.type = 0x00
core.conn.bcn_filt_ie16.version = 0x00, 0x00
core.conn.bcn_filt_ie17.ie = 0x00
core.conn.bcn_filt_ie17.rule = 0x00
core.conn.bcn_filt_ie17.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie17.type = 0x00
core.conn.bcn_filt_ie17.version = 0x00, 0x00
core.conn.bcn_filt_ie18.ie = 0x00
core.conn.bcn_filt_ie18.rule = 0x00
core.conn.bcn_filt_ie18.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie18.type = 0x00
core.conn.bcn_filt_ie18.version = 0x00, 0x00
core.conn.bcn_filt_ie19.ie = 0x00
core.conn.bcn_filt_ie19.rule = 0x00
core.conn.bcn_filt_ie19.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie19.type = 0x00
core.conn.bcn_filt_ie19.version = 0x00, 0x00
core.conn.bcn_filt_ie20.ie = 0x00
core.conn.bcn_filt_ie20.rule = 0x00
core.conn.bcn_filt_ie20.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie20.type = 0x00
core.conn.bcn_filt_ie20.version = 0x00, 0x00
core.conn.bcn_filt_ie21.ie = 0x00
core.conn.bcn_filt_ie21.rule = 0x00
core.conn.bcn_filt_ie21.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie21.type = 0x00
core.conn.bcn_filt_ie21.version = 0x00, 0x00
core.conn.bcn_filt_ie22.ie = 0x00
core.conn.bcn_filt_ie22.rule = 0x00
core.conn.bcn_filt_ie22.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie22.type = 0x00
core.conn.bcn_filt_ie22.version = 0x00, 0x00
core.conn.bcn_filt_ie23.ie = 0x00
core.conn.bcn_filt_ie23.rule = 0x00
core.conn.bcn_filt_ie23.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie23.type = 0x00
core.conn.bcn_filt_ie23.version = 0x00, 0x00
core.conn.bcn_filt_ie24.ie = 0x00
core.conn.bcn_filt_ie24.rule = 0x00
core.conn.bcn_filt_ie24.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie24.type = 0x00
core.conn.bcn_filt_ie24.version = 0x00, 0x00
core.conn.bcn_filt_ie25.ie = 0x00
core.conn.bcn_filt_ie25.rule = 0x00
core.conn.bcn_filt_ie25.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie25.type = 0x00
core.conn.bcn_filt_ie25.version = 0x00, 0x00
core.conn.bcn_filt_ie26.ie = 0x00
core.conn.bcn_filt_ie26.rule = 0x00
core.conn.bcn_filt_ie26.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie26.type = 0x00
core.conn.bcn_filt_ie26.version = 0x00, 0x00
core.conn.bcn_filt_ie27.ie = 0x00
core.conn.bcn_filt_ie27.rule = 0x00
core.conn.bcn_filt_ie27.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie27.type = 0x00
core.conn.bcn_filt_ie27.version = 0x00, 0x00
core.conn.bcn_filt_ie28.ie = 0x00
core.conn.bcn_filt_ie28.rule = 0x00
core.conn.bcn_filt_ie28.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie28.type = 0x00
core.conn.bcn_filt_ie28.version = 0x00, 0x00
core.conn.bcn_filt_ie29.ie = 0x00
core.conn.bcn_filt_ie29.rule = 0x00
core.conn.bcn_filt_ie29.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie29.type = 0x00
core.conn.bcn_filt_ie29.version = 0x00, 0x00
core.conn.bcn_filt_ie30.ie = 0x00
core.conn.bcn_filt_ie30.rule = 0x00
core.conn.bcn_filt_ie30.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie30.type = 0x00
core.conn.bcn_filt_ie30.version = 0x00, 0x00
core.conn.bcn_filt_ie31.ie = 0x00
core.conn.bcn_filt_ie31.rule = 0x00
core.conn.bcn_filt_ie31.oui = 0x00, 0x00, 0x00
core.conn.bcn_filt_ie31.type = 0x00
core.conn.bcn_filt_ie31.version = 0x00, 0x00
core.conn.synch_fail_thold = 0x0000000c
core.conn.bss_lose_timeout = 0x00000190
core.conn.beacon_rx_timeout = 0x00002710
core.conn.broadcast_timeout = 0x00004e20
core.conn.rx_broadcast_in_ps = 0x01
core.conn.ps_poll_threshold = 0x0a
core.conn.sig_weights.rssi_bcn_avg_weight = 0x00
core.conn.sig_weights.rssi_pkt_avg_weight = 0x00
core.conn.sig_weights.snr_bcn_avg_weight = 0x00
core.conn.sig_weights.snr_pkt_avg_weight = 0x00
core.conn.bet_enable = 0x01
core.conn.bet_max_consecutive = 0x32
core.conn.psm_entry_retries = 0x08
core.conn.psm_exit_retries = 0x10
core.conn.psm_entry_nullfunc_retries = 0x03
core.conn.dynamic_ps_timeout = 0x0096
core.conn.forced_ps = 0x00
core.conn.keep_alive_interval = 0x0000d6d8
core.conn.max_listen_interval = 0x14
core.conn.sta_sleep_auth = 0xff
core.conn.suspend_rx_ba_activity = 0x00
core.itrim.enable = 0x00
core.itrim.timeout = 0x0000c350
core.pm_config.host_clk_settling_time = 0x00001388
core.pm_config.host_fast_wakeup_support = 0x01
core.roam_trigger.trigger_pacing = 0x0001
core.roam_trigger.avg_weight_rssi_beacon = 0x14
core.roam_trigger.avg_weight_rssi_data = 0x0a
core.roam_trigger.avg_weight_snr_beacon = 0x14
core.roam_trigger.avg_weight_snr_data = 0x0a
core.scan.min_dwell_time_active = 0x00001d4c
core.scan.max_dwell_time_active = 0x00007530
core.scan.min_dwell_time_active_long = 0x000061a8
core.scan.max_dwell_time_active_long = 0x0000c350
core.scan.dwell_time_passive = 0x000186a0
core.scan.dwell_time_dfs = 0x000249f0
core.scan.num_probe_reqs = 0x0002
core.scan.split_scan_timeout = 0x0000c350
core.sched_scan.base_dwell_time = 0x00001d4c
core.sched_scan.max_dwell_time_delta = 0x000057e4
core.sched_scan.dwell_time_delta_per_probe = 0x000007d0
core.sched_scan.dwell_time_delta_per_probe_5 = 0x0000015e
core.sched_scan.dwell_time_passive = 0x000186a0
core.sched_scan.dwell_time_dfs = 0x000249f0
core.sched_scan.num_probe_reqs = 0x02
core.sched_scan.rssi_threshold = 0xa6
core.sched_scan.snr_threshold = 0x00
core.sched_scan.num_short_intervals = 0x0d
core.sched_scan.long_interval = 0x7530
core.ht.rx_ba_win_size = 0x20
core.ht.tx_ba_win_size = 0x40
core.ht.inactivity_timeout = 0x2710
core.ht.tx_ba_tid_bitmap = 0x3f
core.mem.num_stations = 0x01
core.mem.ssid_profiles = 0x01
core.mem.rx_block_num = 0x28
core.mem.tx_min_block_num = 0x28
core.mem.dynamic_memory = 0x01
core.mem.min_req_tx_blocks = 0x2d
core.mem.min_req_rx_blocks = 0x16
core.mem.tx_min = 0x1b
core.fm_coex.enable = 0x01
core.fm_coex.swallow_period = 0x05
core.fm_coex.n_divider_fref_set_1 = 0xff
core.fm_coex.n_divider_fref_set_2 = 0x0c
core.fm_coex.m_divider_fref_set_1 = 0xffff
core.fm_coex.m_divider_fref_set_2 = 0x0094
core.fm_coex.coex_pll_stabilization_time = 0xffffffff
core.fm_coex.ldo_stabilization_time = 0xffff
core.fm_coex.fm_disturbed_band_margin = 0xff
core.fm_coex.swallow_clk_diff = 0xff
core.rx_streaming.duration = 0x00000096
core.rx_streaming.queues = 0x01
core.rx_streaming.interval = 0x14
core.rx_streaming.always = 0x00
core.fwlog.mode = 0x00
core.fwlog.mem_blocks = 0x02
core.fwlog.severity = 0x00
core.fwlog.timestamp = 0x00
core.fwlog.output = 0x01
core.fwlog.threshold = 0x00
core.rate.rate_retry_score = 0x7d00
core.rate.per_add = 0x2000
core.rate.per_th1 = 0x0800
core.rate.per_th2 = 0x1000
core.rate.max_per = 0x1fa4
core.rate.inverse_curiosity_factor = 0x05
core.rate.tx_fail_low_th = 0x04
core.rate.tx_fail_high_th = 0x0a
core.rate.per_alpha_shift = 0x04
core.rate.per_add_shift = 0x0d
core.rate.per_beta1_shift = 0x0a
core.rate.per_beta2_shift = 0x08
core.rate.rate_check_up = 0x02
core.rate.rate_check_down = 0x0c
core.rate.rate_retry_policy = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
core.hangover.recover_time = 0x00000000
core.hangover.hangover_period = 0x14
core.hangover.dynamic_mode = 0x01
core.hangover.early_termination_mode = 0x01
core.hangover.max_period = 0x14
core.hangover.min_period = 0x01
core.hangover.increase_delta = 0x01
core.hangover.decrease_delta = 0x02
core.hangover.quiet_time = 0x04
core.hangover.increase_time = 0x01
core.hangover.window_size = 0x10
core.recovery.bug_on_recovery = 0x00
core.recovery.no_recovery = 0x00
wl18xx.ht.mode = 0x00
wl18xx.phy.phy_standalone = 0x00
wl18xx.phy.spare0 = 0x08
wl18xx.phy.enable_clpc = 0x00
wl18xx.phy.enable_tx_low_pwr_on_siso_rdl = 0x00
wl18xx.phy.auto_detect = 0x00
wl18xx.phy.dedicated_fem = 0x00
wl18xx.phy.low_band_component = 0x02
wl18xx.phy.low_band_component_type = 0x05
wl18xx.phy.high_band_component = 0x01
wl18xx.phy.high_band_component_type = 0x0a
wl18xx.phy.number_of_assembled_ant2_4 = 0x02
wl18xx.phy.number_of_assembled_ant5 = 0x02
wl18xx.phy.pin_muxing_platform_options = 0x00, 0x00
wl18xx.phy.external_pa_dc2dc = 0x00
wl18xx.phy.tcxo_ldo_voltage = 0x00
wl18xx.phy.xtal_itrim_val = 0x04
wl18xx.phy.srf_state = 0x00
wl18xx.phy.srf1 = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
wl18xx.phy.srf2 = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
wl18xx.phy.srf3 = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
wl18xx.phy.io_configuration = 0x01
wl18xx.phy.sdio_configuration = 0x00
wl18xx.phy.settings = 0x00
wl18xx.phy.rx_profile = 0x00
wl18xx.phy.per_chan_pwr_limit_arr_11abg = 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x18, 0x78, 0x88, 0x88, 0x78, 0x88, 0x82, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0x78, 0x88, 0x88, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf7, 0x22, 0x22, 0xff, 0xff, 0xff, 0xf7, 0x22, 0x22, 0xff, 0xff, 0xff, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf7, 0xff, 0xff, 0xf4, 0x44, 0xff, 0xf4, 0x44, 0xff, 0xf4, 0x22, 0x22, 0xf4, 0x22, 0x22, 0xf6, 0x44, 0x44, 0xff, 0x44, 0x44, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x55, 0xff, 0x44, 0x55, 0xf4, 0xff, 0xff, 0xff, 0x33, 0x22, 0xff, 0x33, 0x22, 0xff, 0x66, 0x66, 0xff, 0x44, 0x66, 0xf6, 0xff, 0xff, 0xff, 0xff, 0xff
wl18xx.phy.pwr_limit_reference_11_abg = 0x55
wl18xx.phy.per_chan_pwr_limit_arr_11p = 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
wl18xx.phy.pwr_limit_reference_11p = 0x64
wl18xx.phy.spare1 = 0x00
wl18xx.phy.per_chan_bo_mode_11_abg = 0x40, 0x00, 0x04, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x19
wl18xx.phy.per_chan_bo_mode_11_p = 0x00, 0x00, 0x00, 0x01
wl18xx.phy.primary_clock_setting_time = 0x05
wl18xx.phy.clock_valid_on_wake_up = 0x00
wl18xx.phy.secondary_clock_setting_time = 0x05
wl18xx.phy.board_type = 0x02
wl18xx.phy.psat = 0x00
wl18xx.phy.low_power_val = 0xff
wl18xx.phy.med_power_val = 0xff
wl18xx.phy.high_power_val = 0xff
wl18xx.phy.per_sub_band_tx_trace_loss = 0x08, 0x18, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10
wl18xx.phy.per_sub_band_rx_trace_loss = 0x08, 0x18, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
wl18xx.phy.tx_rf_margin = 0x01
wl18xx.phy.low_power_val_2nd = 0xff
wl18xx.phy.med_power_val_2nd = 0xff
wl18xx.phy.high_power_val_2nd = 0xff
wl18xx.phy.padding = 0x00
wl18xx.ap_sleep.idle_duty_cycle = 0x00
wl18xx.ap_sleep.connected_duty_cycle = 0x00
wl18xx.ap_sleep.max_stations_thresh = 0x04
wl18xx.ap_sleep.idle_conn_thresh = 0x08

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

I'm not sure if the logs that you've provided tell us much about the core details of the problem, which I take to mainly be why the Bluetooth is causing Wi-Fi to completely drop the signal. Could you go into more detail about your test setup? We may recommend an alternative setup depending on the way your Faraday cage was set up to minimize any variables.

For now, could you please download the TI Wireless Tools to get us comprehensive BT and Wi-Fi logs? The link is here. The SDMMC adapter that you are using to connect the WiLink8 device to your setup should already have the debug pins broken out - the Getting Started guide will have all the necessary details.

Once we get the Wi-Fi and Bluetooth logs, we can gain more insight into what is exactly causing the disconnect and find a solution for you.

Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

Coexistence Debug.zip

Hi Justin,

Your understanding of the problem is correct. The WiFi throughput drops way off. The wireless sniffer tool shows that the 802.11 date rate is dropping to 1 Mbps.

Here are the details

On Sabre Board
1. Connect Wifi to 2.4 Ghz. Any 2.4 Ghz network seems to do. I've reproduced this in a wireless cage, with an AP at my desk, and when connected to my corporate network. The brands of AP's I tested are Netgrear, DLink, Apple Airport Extreme and a Ciso WLC with LAP 1242.
2. Pair a Bluetooth Headset - I've tried two different headsets - brands tested were Sony and Peltor
3. Start Iperf In Server Mode (eg iperf -s)
4. Begin playing SCO audio to the headset. Note: This required some hardware re-work and driver coding to get working on the sabre board - we connected the i2s interface of the WL1837 to audmux4 of the iMX6 and created a basic Alsa SOC codec+machine driver. To play SCO audio I am using an application called BluetoothSCOTest which is on the google play store.

On PC
1. Start iperf in client mode: iperf3 -c 172.30.1.151 -b 15M -t 600 -u

It seems like using a larger bandwidth target can make the issue happen faster. On a wireless trace it looks like the data rate is dropping to 1 Mbps after a while. If I specify a bandwidth limit of 500 Kbps the stream is received with little packet loss. I first noticed this problem when running our custom audio/video streaming application. When the sabre board was using a bluetooth headset the WL1837 was unable to receive a video/audio at a usable rate. I then began doing some tests with Iperf to determine the throughput I could achieve when bluetooth was in use. The results I get are much lower that stated in the WLAN Bluetooth Coexistence app note.

Please let me know if you would like any other details or additional logs. This is the first time I've collected the firmware logs so I hope everything is there. While searching through the forum I found a few issues which sounded similar but couldn't find an answer.

http://e2e.ti.com/support/wireless_connectivity/wilink_wifi_bluetooth/f/307/p/243555/1093821#1093821

http://e2e.ti.com/support/wireless_connectivity/wilink_wifi_bluetooth/f/307/t/243555

http://e2e.ti.com/support/wireless_connectivity/wilink_wifi_bluetooth/f/307/t/327878

http://e2e.ti.com/support/wireless_connectivity/wilink_wifi_bluetooth/f/307/p/146970/547424#547424

Thanks again Justin, looking forward to your response.

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

Thanks for the logs. It looks like it doesn't include trace information - could you please take the logs one more time with the trace info enabled? Enabling it is fairly simple:

1. Download the BT Service Pack and place the three files somewhere on your computer (preferably the Logger install path).

2. In the Logger Settings window of the Logger application, check "HCI/LMP viewer" to enable it.

3. Click "Setup" for the "HCI/LMP viewer" to set up the connection. Click "Add File..." and link to the "TIInit_11.8.32.xml" that was just placed in the earlier path.

For your Faraday cage setup, are all the devices placed in the cage when you are testing? As in, the WiLink device, the router, and the Bluetooth speaker piece in that environment? I am trying to think of a test setup that would minimize any variability in the Wi-Fi or Bluetooth link quality, but we can tackle that issue once we have the more detailed logs.

Last question - how much throughput do you expect your stream to require?

Please let me know!

Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

BT TRACE.zip

Hi Justin, it looks like I got the trace info this time. Please take a look and don't hesitate to ask for any other info.

When I was in the wireless cage all devices were in there too (device with wl1836, DLink Router, and BT head set).

Our stream requires at least 1 Mbps, with the possibility of going up to 6 Mbps. 2 Mbps will be quite common. However this document suggests we can do much better than this. I will be away next week, but my colleagues will be monitor this thread in my absence.

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

My colleague and I looked through the Bluetooth logs and did not find anything wrong with them. The connection event seems to be set up fine without any errors, and nothing stood out to us as wrong. Can you verify that when you attach the Bluetooth earpiece to your setup that the audio streams through the earpiece without issue?

I'd also like to ask you to re-take the Wi-Fi logs with gLogger, it seems that the log file that you attached in an earlier post was simply a link to another file that gLogger was looking for. It seems as if the problem lies somewhere in the Wi-Fi rather than the Bluetooth, but until we have those logs as well, it is hard to tell exactly what is causing the issue.

Once we have both sets of logs, I'll work with my team to get you a fix as soon as we can.

Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

Hi Justin, I re-took the Wifi logs. I'm going to attach a few .csv files from glogger this time. The files stream_3 - stream_6 seem to show the problem at it's worst. Please let me know if you'd like me to gather additional information. https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/968/glogger-logs.7z

0 Scott Brewer16 over 9 years ago in reply to Scott Brewer16

Prodigy 150 points

Hi Justin, I'm attaching on more wifi trace. This one is a bit longer, towards the end of the log the iperf throughput went to 0 and never recovered. https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/968/glog_5F00_2016_5F00_06_5F00_20_5F00_174844.7z

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

Thank you. I am currently looking into the logs and will let you know what I find. To verify, this is using an iMX6 Sabre board with the SDMMC adapter and WiLink8 COM8 EVM, is that correct?

Thanks,
Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

Justin, that is correct. Thanks for your help!

Scott

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

You mentioned the use of different equipment that yielded better results - do you have a Cisco AP that you would be able to gather more iperf data with? Cisco APs do not implement rate fallback so if it shows consistently better performance, then that may be one possible cause for the drop in bandwidth you are seeing.

We are continuing to look into the logs and other possible reasons for the behavior you are observing. In the meantime, do you by chance have a wireless sniffer that you could use to sniff the flow of data in your test setup?

Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

Justin,

Here are some iperf logs and traces for two different AP's (Motorola and Cisco). The Cisco AP seems better, although when bluetooth is on and streaming SCO audio there are large spikes in packet loss. When bluetooth is off packet loss is less than 2% on average. Are the large spikes in packet loss normal when bluetooth is on?

Do you see this issue on your end? Can you let me know what type of AP's you normally test with?

The wireless traces were too big to attach here so I had to save them in .csv format. Let me know if you need me to run any other tests.

Thanks for you help,

Scotthttps://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/968/IPerf_2D00_Wireless-Traces.7z

0 Scott Brewer16 over 9 years ago in reply to Scott Brewer16

Prodigy 150 points

Justin,

Here are a couple more traces from 2 more AP's. Note, I did these tests in a shielded room.

The first AP was an Apple Airport Extreme, it showed the problem right away.

The second AP was a Cisco DPQ3925, this AP worked very well. I'm preforming more tests with this AP right now outside of the shielded room. It's to early to say if everything is fine with this AP, but so far I haven't seen this issues withttps://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/968/Wireless-Traces-2.7zh this AP. The packet loss has been low (< 2-4%) on a 3 Mbps UDP stream when bluetooth was in use. That seems promising, this is what I was expecting with other AP's.

I noticed the other AP's tend to drop there transmit rate to 1 Mbps when bluetooth is in use on the sabre board.

0 Scott Brewer16 over 9 years ago in reply to Scott Brewer16

Prodigy 150 points

Hi Justin, did the logs I send contain useful information to help troubleshoot this issue? From what I've seen so far it looks like there is a compatibility issue with some AP's - which results in the AP dropping it's transmit rate to 802.11b speeds. Do you see this issue on your end, and can you let me know which AP's you test with or can you recommend an AP? If you have any update on this issue that would be great. Please do not hesitate to request additional information.

We are operating under the assumption that this can be resolved with a firmware update. If that is not the case I would appreciate knowing ASAP.

Thanks for all your help

Scott

0 Justin Young over 9 years ago in reply to Scott Brewer16

TI__Prodigy 490 points

Scott,

I noticed in the logs that when the bandwidth drops to zero, that the main transmissions are what seem to be the CTS-to-self packets that "protect" the Bluetooth transmission. However, I believe that even with the Cisco router you tested that you should see more than 3Mbps of continuous bandwidth.

Theoretically, your SCO stream should not need to use more than 1/3 of the antenna's capacity (the SCO test is on 2-EV3 channel). Have you done a test with A2DP audio to see if the bandwidth drop is unique to when you use SCO or if it's with any data at all over Bluetooth?

I've forwarded this issue to our R&D team and they have more capability to test and give a definite answer on whether or not this is something that we can solve. I expect to have a more concrete answer by tomorrow. Apologies for the delay!

Justin

0 Justin Young over 9 years ago in reply to Justin Young

TI__Prodigy 490 points

Scott,

We noticed in the logs that you are currently using BT-SP version 107, which is very old. Can you verify that you've downloaded the latest BT Service Pack from this link.

The current SP is at 3.9, corresponding to the BTS version of P2.136. Once you download it, copy the TIInit_11.8.32.bts into /lib/firmware, making sure to remove and replace any older BTS file that might be present.

Let me know if this works!

Justin

0 Scott Brewer16 over 9 years ago in reply to Justin Young

Prodigy 150 points

Justin, unfortunately the problem still exists with BT-SP 3.9. You can refer to my post on May 30th describing my software setup when I discovered this issue, on our custom board. The sabreboard is running an earlier TI software package, but my custom board is up to date. The main reason for running tests on the sabre board was to get access to the firmware logs. Has R&D ever heard to this issue before or been able to reproduce it based on my summary? I will try the same test with A2DP instead of HFP and let you know the results.

Thanks

Scott

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WL1837 WLAN Rx Coexistence Issue