Frankfurt is EU and the procedures are P-RNAV.
This is similar but not the same as RNP 1.
The use of GNSS depends on the A/C type. If your AFM says you must have GNSS to meet P-RNAV then you must have it. If it doesn't then you don't. Some aircraft meet P-RNAV requirements by fitting a standalone GPS system. For these aircraft the use of GPS is mandatory.
These regs can all be found here:
EUROCONTROL Navigation Domain - What is P-RNAV?
The UAE plates are PBN compliant and info can be found here:
PERFORMANCE BASED NAVIGATION TRAINING PACKAGE Version 2.0