How to set TX power for BIS ISO streams alone

RE: How to set TX power for BIS ISO streams alone

Maria Gilje — Tue, 08 Oct 2024 09:16:12 GMT

Hello,

I appreciate your patience.

Sorry to hear that setting the TX powers for channels is not a feasible solution. Unfortunately it is not possible to set the TX power for individual BISes.

A possible future solution is to set the TX power for BIGs. This is a feature request which we are tracking internally. If this is a good option for you I will let you know when there are any relevant updates.

Best regards,

Maria

RE: How to set TX power for BIS ISO streams alone

Benno Trutmann — Fri, 27 Sep 2024 12:32:16 GMT

This is not workable for me. I want to set a fixed TX power level for a whole BIS ISO stream and not for a fixed BLE channel. The BIS ISO stream frequency hops over all available channels, so setting the TX power level for all these channels via mpsl_tx_power_channel_map_set() would set the TX power level for any communication and not only the BIS ISO stream.

RE: How to set TX power for BIS ISO streams alone

Maria Gilje — Thu, 26 Sep 2024 11:12:28 GMT

I return with some more resources.

You can set the TX power for individual channels by using the TX power part of the Multiprotocol Service Layer (MPSL). Populate a mpsl_tx_power_envelope_t struct and pass it to mpsl_tx_power_channel_map_set().

BR,

Maria

RE: How to set TX power for BIS ISO streams alone

Maria Gilje — Wed, 25 Sep 2024 14:28:12 GMT

Hi again Benno,

My apologies for the wait.

I have found some relevant information internally which I will prepare and share with you tomorrow. The gist of it is that we have functionality to configure the transmit power on individual channels, but I need some more time to find the specifics.

[quote user=""]but these handles were not accepted by the BT_HCI_OP_VS_WRITE_TX_POWER_LEVEL command. [/quote]

The reason for this is that BT_HCI_OP_VS_WRITE_TX_POWER_LEVEL was created for the now deprecated LE Audio-specific Controller subsystem. It is not valid for the SoftDevice Controller which supports LE Audio from NCS v2.6.0.

I'll be back tomorrow with more!

Best regards,

Maria

RE: How to set TX power for BIS ISO streams alone

Benno Trutmann — Thu, 19 Sep 2024 14:58:01 GMT

I am using NCS 2.7.0.

RE: How to set TX power for BIS ISO streams alone

Maria Gilje — Thu, 19 Sep 2024 14:55:56 GMT

Hi Benno,

[quote user=""]Is there a way to only set the TX power level for the packets belonging to BIS streams?[/quote]

I will investigate if this is possible and/or supported in nRF Connect SDK (NCS).

Please let me know which NCS version you are using so we can give you the most relevant information.

Best regards,

Maria