Map RRC parameters to PHY parameters

Dear friends,
I hope you are doing well in these hard times.

I want to know how people normally map RRC parameters to PHY parameters (like cell-specific parameters, TTI parameters, UE specific parameters). Is there an easy way.
And how do they normally verify whether the mapping is correct?

I am a PHY engineer and wants to understand how it is being done at MAC.

If you’re talking in terms of small cell there is interface defined between PHY and MAC known as FAPI interface which transport and phy specific, tti and UE specific information.

Yes correct.
There are some parameter coming from RRC for cell config and FAPI defines P5 message for that.
How do you actually find out which RRC parameter will go to which FAPI parameter.
Any guidance?