This param applies to both FDD and TDD.
What other OEMs (like Nokia for example) have a configurable threshold for correlation.
For example if correlation is lower than 0.3 then UEs can be paired for MU-MIMO.
And this 0.3 is configurable by MNOs.
Could be 0.4 or 0.2 or any other value between 0 and 1.