RE: Inquiry on Concurrent Use of THREAD and BLE with Specific Power Settings

Marte Myrvold — Tue, 01 Apr 2025 11:53:30 GMT

Hi,

It should be possible to set the TX power to different values for Thread and BLE in a multiprotocol application.

The maximum TX power for Thread on the nRF52840 is +8 dBm. If you want +20 dBm, you will need to use a FEM, such as the nRF21540.

The multiprotocol part is handled by the MPSL library, and allocates time slots for the radio protocols. Because of this, interference should not be a problem, as only one radio is transmitting at a time. One thing to be aware of is that BLE activity takes priority over Thread, which means that Thread logic may be interrupted by BLE. This also means that when BLE is performing time-consuming tasks, such as scanning or maintaining a large number of connections, it can affect the Thread performance. Because of this, you should set scanning and connection parameters accordingly.
You can read more about limitations and considerations in Multiprotocol support.

Best regards,
Marte