Massive MIMO Layers (8 layers) vs RF condition (SINR)

Does anyone have relationship table between Massive MIMO Layers (8 layers) vs RF condition (SINR). How layers will be scheduled based on SINR values?
Appreciate if anyone know.

Each vendor has a very proprietary algorithm regarding the adjustment of the number of layers. Especially in TDD systems vendors use the weighting of beams based on SRS not based on PMI. One condition is that there has to be hundreds of TTIs with MCS>22 to increase the rank (number of layers). There are other conditions too. Only in very bad RF condition the gNodeB listens to RI and PMI reported by UE. Anyway you will not see soon 8 layers; as of today the maximum number is 4 layers per UE.

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