Feasibility on LE Audio + Mesh + Bidirectional streams.

[WFKwok]

We are checking the feasibility on LE Audio + Mesh + Bidirectional streams.
A picture is attached for the situation.
We would like to know how to apply Mesh network on LE Audio.
So every device can be a broadcast stream if speaking, or just a normal headset to receive LE audio stream.

1) Is it feasible to develop LE Audio + Mesh + Bidirectional streams?
If yes, any solution concept can be provided to make it work?
Or any limitation? so we can optimize the application based on limitations.

2) BIS is a unidirectional communication protocol.
Can a nRF5340 device be broadcast source and sink at the same time?
So it is a broadcast source and sink when speaking or broadcast sink only if no speaking, possible?
like generating a key to distinguish different broadcast sources in BLE data.

3) Multiple LE audio broadcasters sending data to single LE audio receiver is not feasible?
devzone.nordicsemi.com/.../multiple-le-audio-broadcasters-sending-data-to-single-le-audio-receiver
It mentions the BIS packets could overlap and don't expect this will work well unfortunately.
So is there any update after 2 years for the latest NCS?

Thanks.

[Elfving]

Hello,

I just want to be clear thing up a bit at first here.

One thing that stands out with BLE Mesh, is that it allows you to form a network that spans a large area, in which all messages can reach the entire span of the network by relaying the message. Is that what you are looking for here in the Audio case as well? That the audio stream is sent to the one device at first, then relayed from the one device to the other indefinitely? Or do you simply want support for LE Audio in addition the BLE Mesh? Or just that the headsets can both broadcast and listen in on streams?

Regards,

Elfving

[WFKwok]

Yes, I am looking for the same BLE mesh for the audio case.
The situation is like an intercom system with Mesh feature for all devices:
Headset A can broadcast audio stream to headset B, and then headset B relay the audio steam to headset C.
Also, headset B can broadcast the second audio stream to headset A and headset C if speaking. 
Headset C can broadcast the third audio stream to headset B is speaking, and the stream can be relayed from headset B to A. 

But I know the standard BLE Mesh is not expected for audio usage. Or we have something else to achieve?
We want LE Audio in addition the BLE Mesh if possible.

Thanks.

[Elfving]

I see. Unfortunately, we do not have any solution for this at the moment.

You might want to look into DECT nR+ in case it supports what you need. 

Note that a broadcaster with power amplifier and resilient settings can have very good range.

Regards,

Elfving