What is the difference between OSS based UL RSRP values and DT based DL RSRP values?

Hi Experts,
Can anyone please share what is the difference between OSS based UL RSRP values and DT based DL RSRP values for LTE and 5G NR SA?

DT is your drive test RSRP so what is actually mobile measure during drive test.
These are more accurate since come from actual testing on ground.
But data source is limited.
OSS is what eNode collect and store in OSS as part of data it collects from devices through measurement reports.
There is large amount of such data but eNode only collects range of values so not very accurate.
Two should match but not necessarily.

Understood. And can we say UL is always poorer than DL values, what by 15-20 dbm?

Cannot remember what are normal values but networks are always UL limited.
Planners job is to minimize this.
There are number of ways to check this issue.
For instance there are counters to measure how many UEs maxed out on UL power or dropped due to that.

Aware of these ULRSRP and even ULSINR counters but to figure how many users are dropped due to poor UL, found it interesting, but thanks.
Just found out that in 5G UL OSS and DL RSRP has different of atleast 20 dBm (meaning UL poorer).

Positive PHR is good (meaning UE has some spare power) negative PHR is bad (means UE woudl need more power to transmit its data in the buffer on more PRBs).
So you should be concerned about cells having lot of samples in index 0,1 and 2.
Meaning UL coverage is poor and there is high demand for UL data there.