How path loss is calculated by UE?

Hi All,
Can anyone explain me in simple words how path loss is calculated by UE?
My understanding it’s as per measured RSRP.

I’m seeing there is no standard equation.

RS Power of eNB - RSRP at UE = Path loss

Sib1 broadcast eNB TX power?

Sib2 Rs power.

You can check below link, it quite detailed: