interact when process BT scan & WIFI scan simultaneously - CYW43353

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mili_2550941
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Dear:

     We choose a module which use CYW43353 as BT&WIFI processor. Now we have a problem as below:

Process BT scan first then process WIFI scan, the result of WIFI scan is less than not process BT scan simultaneously(some WIFI missed ). If we process WIFI scan only, the result is correct.

     It seems BT scan influence the WIFI scan. Is it correct?

    

     We now confused, because Datasheet says "allows for lossless simultaneous Bluetooth and WLAN reception for shared antenna applications" accroding to 5.7 Advanced Bluetooth/WLAN Coexistence.

     Pls give me a explanation?

Thanks & BR!

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1 Solution

Hi :

      For scan mode wifi and bt both want to get high priority in the RX side,  So it really needs to be tuned very carefully if it is a must.  in our normal user experience it has a small chance to let them work together in scan mode,  Android or Windows, or linux OS will divide the scan function in different setting menu , and most customer concern is normal working coex mode after wlan connected , bt device connected.

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8 Replies
MichaelF_56
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Please include which module partner you are working with as there are only a few building modules based on the 43353, which is designated an automotive device.

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          I84,  ivtwireless.

     Our supplier tell us can't fix this problem, because there is interact when process BT scan & WIFI scan simultaneously.I want confirm with cypress again.is this explanation right or how to fix this problem?

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Hi :

      For scan mode wifi and bt both want to get high priority in the RX side,  So it really needs to be tuned very carefully if it is a must.  in our normal user experience it has a small chance to let them work together in scan mode,  Android or Windows, or linux OS will divide the scan function in different setting menu , and most customer concern is normal working coex mode after wlan connected , bt device connected.

Dear zhez:

     Here is the use case:

1: connect BT phone.

2: then power off device, android system will be shutdown.

3: power on device. system try to reconnect BT phone.

4: user switch on wifi to scan wifi.

then bt & wifi scan act simultaneously。 Any more suggestion to fix it?

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Zhengbao_Zhang
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Hi :

     Just suggestion,  I think you can have a try to let the scan from 5G band firstly ,then to 2.4G band.

That will reduce the possibility for 2.4G scan working together. 

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Dear zhez:

     unfortunately we have only one antenna (2.4G).

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Hi :

    Because this is only happened on the first power-on time, so recommend you to avoid the conflicts on high layer .  

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Thanks zhez!

We will try to avoid this case on high layer.

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