Parameters versus RTWP degradation in UMTS

Hello Experts

What parameters to check to ensure RTWP degradation in UMTS is not relation to configuration?

Any increase in users and traffic?
RTWP checked in busy hour or non busy hour?

In busy hour AND non busy hour.

And before was it Ok?

What is the value of the RTWP?
Any hardware action has been implemented on the site?
The degradation on one site or cluster or more?

-101 on U2100 carrier.
1 site only: 1 carrier and 1 cell (beta cell)