Difference between having phone configured with TM4 and TM9

RAN
,
1

Hello all.

As an end user experience, what would be the difference between having my phone configured with TM4 and TM9?

Is there any change in speed or quality?

How can I test in live network?

2

TM4 is basically closed loop MIMO.

TM9 is very less deployed kind of MU-MIMO concept, where user can have multiple layers of data from eNodeB.

TM9 I think in USA market may be deployed, but widely it’s TM4.

TM9 uses csi-rs signal concept.

3

Thanks.

And about user experience, what would be the difference?

4

TM3-TM4 is better when you are closer to cell site and you have good signal quality, over there TM9 brings only additional overhead that doesn’t bring extra benefit. When you are closer to cell edge, then the TM9 provides better experience because you get more precise beamforming rather than just pick from a codebook.
We had a drive test where we were comparing just that and we could see it on throughputs.