LE Audio throughput calculation & Audio Qos setting.

[Hhhhh]

Using nrf5340 audio DK & ncs v2.60

I modify this function to print this information when the number of packages reaches 100.

packet_count++;
	if(packet_count ==100)
	{
		printk("Packet %d received: data_size=%d, bad_count=%d, sdu_ref=%d, channel_index=%d, recevied_frame_ts = %d\n",
		packet_count, data_size, bad_count, sdu_ref, channel_index,recv_frame_ts);
		packet_count =0;
		bad_count = 0;
	}

\

Part of the result:

Packet 100 received: data_size=120, bad_count=0, sdu_ref=136985719, channel_index=0, recevied_frame_ts = 136974165
Packet 100 received: data_size=120, bad_count=0, sdu_ref=137985719, channel_index=0, recevied_frame_ts = 137974155

120*100*8/((137985719-136985719)*10^-6) = 96kbps

Q1:Is this method reasonable?

Q2:By the way, I want to change the audio qos configuration in LE Audio application( sdk-nrf/applications/nrf5340_audio ) like this ticket, how to change?

Because these two questions are somewhat related, they were asked together.

Appreciate your help.

[dejans]

Hi,

Q1:Is this method reasonable?

Your calculation seems reasonable for the audio data rate used by the system. Please note that this is not actual throughput over the air as there might be retransmissions.

Q2:By the way, I want to change the audio qos configuration in LE Audio application( sdk-nrf/applications/nrf5340_audio ) like this ticket, how to change?

What exactly are you interested in changing regarding QoS? What are you trying to achieve? Can you elaborate on this?

Best regards,
Dejan

[Hhhhh]

Hi dejans, thanks for your reply

To increase the throughput, I want to change the SDU size ,SDU interval, Retransmission number and so on.

Like this:

Maybe I can change here, not sure:

[dejans]

Hi,

Which application do you use and in which NCS version?

Best regards,
Dejan

[Hhhhh]

The application is nrf5340_audio, version is 2.6.1

[dejans]

Hi,

You can get more information about sdu, interval, and find info about bt_audio_codec_qos in the documentation. There is also BT_AUDIO_RETRANSMITS Kconfig.
Additionally, you can look at Basic Audio Profile sample and Bluetooth Audio API.

Best regards,
Dejan